Common problems with batteries
发布时间：2024-11-28 22:52:45 点击： 次
1、 Common questions?
1. What is the depth of discharge? What does a discharge depth of 20% mean?
The discharge depth of a battery refers to the degree of capacity released by the battery during discharge, usually expressed as a percentage. 20% indicates that the discharged capacity of the battery has reached 20% of its rated capacity, leaving the battery with 80% capacity remaining.
2. What are the advantages of VRLA batteries compared to traditional open lead-acid batteries? 1) No maintenance work such as adding acid, water, or adjusting acid density is required; 2) Sealed structure, no acid leakage, and no acid mist discharge; 3) The electrolyte does not flow and can be installed vertically or horizontally;
4) No dedicated battery room is required, it can be combined with other devices and occupies a small area.
3. What is the chemical equation for the reactions that occur inside lead-acid batteries during the charging and discharging process? Positive pole: PbO2+HSO4-+3H++2e PbSO4+2H2O Side reactions: H2O 2H++ O2
negative pole: Pb+HSO4--2e PbSO4+H+Side reaction: 2H++2e H2
Overall response: PbO2 + Pb + 2H2SO4 2PbSO4 + 2H2O
4. What is the function of the safety valve for VRLA batteries?
To prevent the internal pressure of the battery from being too high during use, the safety valve automatically opens to release pressure when the internal pressure of the battery reaches a certain value, and automatically closes when the pressure returns to normal, which is a one-way valve.
5. What is the normal opening and closing pressure of the safety valve?
The communication standard (YD/T 799-2002) requires the opening pressure of the battery to be 10-35kPa and the closing pressure to be 3-15kPa.
The power standard (DL/T 637-1997) requires the opening pressure of the battery to be 10-49kPa and the closing pressure to be 1-10kPa.
6. What factors are related to the service life of VRLA batteries?
The service life of VRLA batteries is related to the design, manufacturing, and proper use by customers.
7. At what ambient temperatures can VRLA batteries be used? What is the best range to control the ambient temperature? VRLA batteries can be used in workplaces with ambient temperatures ranging from -15 ℃ to 45 ℃. It is recommended to control the ambient temperature within the range of 5 ℃ to 30 ℃, with the optimal ambient temperature being between 15 ℃ and 25 ℃.
8. What is the approximate open circuit voltage of a VRLA battery cell? Generally, it is 2.11-2.14V, and it is considered normal if it is greater than 2.10V after leaving the factory.
9. What inspections should be carried out after installing VRLA batteries? After installing the battery, the following checks should be performed:
1) Check whether the conductive connection bolts are tightened one by one; 2) Is the battery connection consistent with the installation diagram requirements; 3) Check if the total voltage of the battery is normal.
10. What aspects should be recorded in the daily maintenance work of VRLA batteries? Including the following content:
1) 2) Float charging voltage, internal resistance, and connection resistance of each battery. 3) Float charging terminal voltage (total voltage). 3) Environmental temperature and external temperature of the battery. 4) Measurement date and recorder.
11. How to deal with the problem of floating charge voltage changing with temperature in the battery room without air conditioning during daily maintenance? If the charger has temperature compensation function, it can automatically adjust the float charging voltage according to the set temperature compensation coefficient as the temperature changes; Otherwise, manual adjustment of the float charging voltage is required.
12. What conditions should a battery room have to ensure long battery life?
The environmental temperature should be controlled between 5-30 ℃, and good ventilation should be required indoors to facilitate air circulation and heat dissipation. If the temperature is too high, it is recommended to install air conditioning equipment. 13. What situations require balanced charging of VRLA battery packs? 1) After the battery system is installed, recharge the battery; 2) Full float charging operation for more than 3 months; 3) Suspend for more than 3 months;
4) During the float charging operation, two batteries had a voltage below 2.18V. 5) Release more than 5% capacity during discharge;
14. How to determine if the VRLA battery is fully charged using constant voltage current limiting method? There are two criteria:
1) Charging time reaches 18-24 hours
(Non deep discharge can be shorter, for example, a battery with a discharge depth of 20% can shorten the charging time to 10 hours). 2) The charging current drops to the minimum value and remains unchanged for 3 consecutive hours.
15. What is the most accurate and effective method for VRLA battery capacity detection at present? Capacity discharge.
16. How long should VRLA batteries undergo full capacity testing and discharge at least once?
Newly installed batteries should undergo a full capacity discharge test before being put into operation. During the first two years of operation, a 30% to 40% check discharge should be conducted annually, and after the third year, a full capacity discharge test should be conducted annually.
17. What are the two main functions of VRLA batteries in full float charging operation? There are two main aspects to consider:
1) When the mains power is interrupted or the rectifier equipment malfunctions, the battery pack takes on the task of supplying power to the load separately to ensure uninterrupted communication.
2) Plays a role in smoothing filtering. The battery pack, like capacitors, has a charging and discharging function, thus having a bypass effect on the AC component. This further reduces the pulsating component sent to the load, thereby ensuring the voltage requirements of the load equipment. 18. What should be done for battery packs with insufficient capacity detected during capacity testing? (1) The entire battery pack should be uniformly charged for 18-24 hours. (2) Or use a single charger to recharge the battery separately.
19. At present, only by measuring the internal resistance value of VRLA battery cells, can the capacity of the measured battery be accurately determined?
I can't. The internal resistance of a battery is closely related to its capacity, but there is not a general linear relationship between the two, so internal resistance cannot be directly used to represent the accurate capacity of a battery. But if the internal resistance of a single battery exceeds a certain empirical value, the battery will not be able to discharge its due capacity. Therefore, internal resistance can be used as an indicator to evaluate the performance of the battery.
20. What is the most effective use of an internal resistance tester in daily maintenance work? As a daily maintenance and use of batteries, it is the most effective supplementary testing besides capacity testing.
How to use internal resistance to judge the quality of a battery?
The main way to judge the quality of a battery is to use the incremental changes in internal resistance or the trend of increasing internal resistance.
22. What is thermal runaway?
Thermal runaway refers to a cumulative positive feedback chain reaction between the charging current and battery temperature during constant voltage charging of a battery, which gradually damages the battery. The consequence is that the battery casing swells and loses water.
What are the advantages and disadvantages of capacity testing and internal resistance testing? Capacity testing is the only accurate method for measuring battery capacity. The disadvantages are:
1. The workload is heavy and may pose a threat to the running system during testing; 2. The use of specialized equipment incurs high costs; 3. Accelerate battery aging. Although internal resistance testing cannot accurately measure the capacity of a battery, it can make judgments on the quality of the battery. Its advantages lie in:
1. Small testing workload, online testing, will not pose a threat to the running system; 2. Low cost of using equipment; 3. It will not cause damage to the battery.
What are the effects of high current charging and discharging on batteries?
Water loss, easy bending of electrode plates, and detachment of active substances can accelerate battery failure.
What are the common faults of valve controlled sealed batteries during use?
Short circuit, leakage, reverse polarity, sulfation of electrode plates, bending and corrosion fracture of electrode plates, detachment of active substances, capacity loss, abnormal voltage, short cycle life.
What are the reasons for excessive voltage drop in battery packs (usually the entire battery pack has a voltage drop of more than 1V)? The main reasons are
(1) The battery pack wiring is too long and the design is unreasonable; (2) The screws inside the battery pack are loose, resulting in high contact resistance.
27. What are the solutions for large voltage differences in battery packs? There are solutions available
(1) Balanced charging (2) charge discharge cycle
(3) Open the valve for 24 hours (4) and observe the extended usage time
28. What are the reasons for battery leakage and how to solve them? reason:
a) Aging of sealant leads to cracks at the sealing area;
b) The battery is severely overcharged, and different types of batteries are mixed, resulting in poor gas recombination efficiency of the battery; c) Acid splashes out during acid infusion, causing false leakage. resolvent:
1) Wipe the battery that may be a false leak and observe it later; 2) Replace the leaking battery.
What is the relationship between discharge depth and cycle life of VRLA batteries? The deeper the discharge depth, the shorter the cycle life.
What are the storage requirements for batteries?
Require good ventilation facilities, dryness (preferably with air conditioning), and maintain an ambient temperature of around 25 ℃; Strong ground bearing capacity; After storing for 3 months, it is necessary to replenish electricity.
Why does the battery sometimes' fail to discharge 'during use?
The battery is discharged in a normal float charging state, and if the discharge time does not meet the requirements, the battery voltage on the system has already dropped to its set value, and the discharge is in a terminated state. The reason is:
(1) The discharge current of the battery exceeds the rated current, resulting in insufficient discharge time, while the actual capacity reaches; (2) Insufficient actual float charging voltage during float charging can cause long-term undercharging of the battery, insufficient battery capacity, and may lead to battery sulfation;
(3) Loose connection strips between batteries result in high contact resistance, causing a large voltage drop during discharge and a rapid voltage drop across the entire battery pack (the opposite is true during charging, where the voltage of this battery also rises rapidly);
(4) When discharging, the ambient temperature is too low, and as the temperature decreases, the battery discharge capacity also decreases.
What are the hazards of battery short circuit? May cause a fire and render the battery unusable.
What are the reasons for battery reverse polarity?
The reverse polarity of a battery refers to the change in the positive and negative poles of the battery. Reverse polarity is manifested in two aspects: one is due to the reverse polarity of a single cell battery or the reverse polarity of the entire battery pack during installation; The second issue is that when a battery is used in series during capacity discharge, it may lose capacity due to one battery having a lower capacity or completely losing capacity. What are the reasons for the sulfation of electrode plates? There are several reasons for the sulfation of electrode plates:
1) Insufficient initial charging of the battery or prolonged interruption of initial charging time; 2) Long term insufficient charging of the battery; 3) Failure to charge in a timely manner after discharge;
4) Frequent overcharging or low current deep discharge;
5) If the electrolyte density is too high or the temperature is too high, lead sulfate will deeply form and be difficult to recover; 6) The battery has been idle for a long time and has not been regularly charged due to long-term disuse; 7) The electrolyte is impure and self discharge is large;
8) Internal short circuits or excessive water on the battery surface can cause leakage; 9) The low electrolyte level inside the battery causes the exposed part of the electrode plate to undergo sulfation.
What are the methods to solve the sulfation of electrode plates?
Charge repeatedly with low current (0.1~0.2C10A) for a long time until the capacity is restored
36 Where should the installation location of VRLA batteries be far away from? What is the safe distance?
The installation location should be far away from heat sources and places that are prone to sparks; The safety distance should be at least 0.5 meters, and maintenance space should be reserved between groups of batteries and between batteries and other devices.
What are the hazards of not tightening the connecting bolts? What is the required torque for connecting bolts during battery installation? Loose connections can cause an increase in resistance at the connection point, which can easily cause ignition during charging and discharging, and in severe cases, lead to heating, fire, and accidents. The required torque for connecting bolts is 15N · M.
Why can't old and new batteries be mixed? Can't different manufacturers or batteries of different capacities be mixed? Due to inconsistent technical indicators such as internal resistance and capacity, it can cause uneven charging and discharging, leading to chain deterioration.
Why can't batteries with a capacity below 80% continue to be used? Batteries with a capacity below 80% will enter a trend of rapid deterioration. 2、 Maintenance procedures
1. Installation precautions
Customers need to carefully read the product technical user manual and install and use it according to the requirements. Attention should be paid to: (1) The battery should be stored in an environment of 5-30 ℃ before installation and use. If it exceeds 3 months, the battery must be recharged. The method of recharging is to uniformly charge at a voltage of 2.35V per unit (25 ℃).
(2) New and old batteries should generally not be mixed, and batteries from different manufacturers or with different capacities should not be mixed.
(3) The valve controlled battery is 100% charged before leaving the factory, and must be operated carefully to prevent short circuits. (4) During installation, insulated gloves should be worn, insulated tools should be used, and safety should be taken into account.
(5) When connecting the battery, the screws must be tightened, but it is also necessary to prevent excessive force from damaging the copper embedded parts of the pole. The torque for tightening is 15N · M.
(6) According to the prescribed series parallel circuit, start from the positive pole and connect the batteries, columns, layers, and panel terminals in sequence. Be careful not to tighten them first, and tighten them together after the entire group is in place.
(7) Before installing the end connectors and connecting the entire power system, the positive and negative polarities should be carefully checked, and the voltage of each battery and the total voltage should be measured.
(8) When designing the connection method, the lead wires should be as short as possible to reduce wiring resistance.
(9) When two or more batteries are connected in parallel, it is recommended that the cables from each battery to the load be of equal length to facilitate current balance between the batteries during charging and discharging.
(10) Connect the battery lead to the switch power supply and use a multimeter to confirm the polarity of the wiring.
(11) At the end of installation, the system voltage and the positive and negative directions of the battery should be checked again to ensure correct battery installation.
2. Parameter settings
VRAL batteries can be used in an environment of -15 ℃ to 45 ℃, with the optimal operating temperature being 15-25 ℃. The parameters for the 25 ℃ switch power supply are set as shown in Table 1, and other temperatures are adjusted according to Table 2. Table 1 Parameter Settings for Switching Power Supply
Parameter content setting: Floating charging voltage 2.23V, average charging voltage 2.35V, charging current limit 0.1C10, high voltage alarm value, average single cell 2.4V, low voltage alarm value, average single cell 1.9V, battery temperature compensation coefficient 3mV/battery temperature too high 35 ℃
LVDS off voltage average cell 1.83V LVDS reset voltage average cell 2.05V average charging cycle 90 day cycle average charging time
10h
Starting condition (capacity/voltage) for recharging and equalization: Release over 20% capacity, float charge to equalization condition of 50mA/Ah, power outage equalization time of 10h, exit equalization condition of 5mA/Ah, continue equalization time of 3h, charging capacity multiple not less than 1.2 times, battery scrap index less than 80% of rated capacity, battery terminal voltage difference
Floating charge/open circuit (50 mV/20 mV)
3. Charging of batteries (1) float charging
The relationship between float charging voltage and temperature: Float charging operation is the optimal operating condition for batteries. During operation, the battery is always in a fully charged state, and operating under this condition will achieve the longest service life of the battery. During float charging operation, the charging voltage should be adjusted appropriately according to the ambient temperature. Generally, for every 1 ℃ increase in temperature, the float charging voltage of each battery should be adjusted accordingly
1. What is the depth of discharge? What does a discharge depth of 20% mean?
The discharge depth of a battery refers to the degree of capacity released by the battery during discharge, usually expressed as a percentage. 20% indicates that the discharged capacity of the battery has reached 20% of its rated capacity, leaving the battery with 80% capacity remaining.
2. What are the advantages of VRLA batteries compared to traditional open lead-acid batteries? 1) No maintenance work such as adding acid, water, or adjusting acid density is required; 2) Sealed structure, no acid leakage, and no acid mist discharge; 3) The electrolyte does not flow and can be installed vertically or horizontally;
4) No dedicated battery room is required, it can be combined with other devices and occupies a small area.
3. What is the chemical equation for the reactions that occur inside lead-acid batteries during the charging and discharging process? Positive pole: PbO2+HSO4-+3H++2e PbSO4+2H2O Side reactions: H2O 2H++ O2
negative pole: Pb+HSO4--2e PbSO4+H+Side reaction: 2H++2e H2
Overall response: PbO2 + Pb + 2H2SO4 2PbSO4 + 2H2O
4. What is the function of the safety valve for VRLA batteries?
To prevent the internal pressure of the battery from being too high during use, the safety valve automatically opens to release pressure when the internal pressure of the battery reaches a certain value, and automatically closes when the pressure returns to normal, which is a one-way valve.
5. What is the normal opening and closing pressure of the safety valve?
The communication standard (YD/T 799-2002) requires the opening pressure of the battery to be 10-35kPa and the closing pressure to be 3-15kPa.
The power standard (DL/T 637-1997) requires the opening pressure of the battery to be 10-49kPa and the closing pressure to be 1-10kPa.
6. What factors are related to the service life of VRLA batteries?
The service life of VRLA batteries is related to the design, manufacturing, and proper use by customers.
7. At what ambient temperatures can VRLA batteries be used? What is the best range to control the ambient temperature? VRLA batteries can be used in workplaces with ambient temperatures ranging from -15 ℃ to 45 ℃. It is recommended to control the ambient temperature within the range of 5 ℃ to 30 ℃, with the optimal ambient temperature being between 15 ℃ and 25 ℃.
8. What is the approximate open circuit voltage of a VRLA battery cell? Generally, it is 2.11-2.14V, and it is considered normal if it is greater than 2.10V after leaving the factory.
9. What inspections should be carried out after installing VRLA batteries? After installing the battery, the following checks should be performed:
1) Check whether the conductive connection bolts are tightened one by one; 2) Is the battery connection consistent with the installation diagram requirements; 3) Check if the total voltage of the battery is normal.
10. What aspects should be recorded in the daily maintenance work of VRLA batteries? Including the following content:
1) 2) Float charging voltage, internal resistance, and connection resistance of each battery. 3) Float charging terminal voltage (total voltage). 3) Environmental temperature and external temperature of the battery. 4) Measurement date and recorder.
11. How to deal with the problem of floating charge voltage changing with temperature in the battery room without air conditioning during daily maintenance? If the charger has temperature compensation function, it can automatically adjust the float charging voltage according to the set temperature compensation coefficient as the temperature changes; Otherwise, manual adjustment of the float charging voltage is required.
12. What conditions should a battery room have to ensure long battery life?
The environmental temperature should be controlled between 5-30 ℃, and good ventilation should be required indoors to facilitate air circulation and heat dissipation. If the temperature is too high, it is recommended to install air conditioning equipment. 13. What situations require balanced charging of VRLA battery packs? 1) After the battery system is installed, recharge the battery; 2) Full float charging operation for more than 3 months; 3) Suspend for more than 3 months;
4) During the float charging operation, two batteries had a voltage below 2.18V. 5) Release more than 5% capacity during discharge;
14. How to determine if the VRLA battery is fully charged using constant voltage current limiting method? There are two criteria:
1) Charging time reaches 18-24 hours
(Non deep discharge can be shorter, for example, a battery with a discharge depth of 20% can shorten the charging time to 10 hours). 2) The charging current drops to the minimum value and remains unchanged for 3 consecutive hours.
15. What is the most accurate and effective method for VRLA battery capacity detection at present? Capacity discharge.
16. How long should VRLA batteries undergo full capacity testing and discharge at least once?
Newly installed batteries should undergo a full capacity discharge test before being put into operation. During the first two years of operation, a 30% to 40% check discharge should be conducted annually, and after the third year, a full capacity discharge test should be conducted annually.
17. What are the two main functions of VRLA batteries in full float charging operation? There are two main aspects to consider:
1) When the mains power is interrupted or the rectifier equipment malfunctions, the battery pack takes on the task of supplying power to the load separately to ensure uninterrupted communication.
2) Plays a role in smoothing filtering. The battery pack, like capacitors, has a charging and discharging function, thus having a bypass effect on the AC component. This further reduces the pulsating component sent to the load, thereby ensuring the voltage requirements of the load equipment. 18. What should be done for battery packs with insufficient capacity detected during capacity testing? (1) The entire battery pack should be uniformly charged for 18-24 hours. (2) Or use a single charger to recharge the battery separately.
19. At present, only by measuring the internal resistance value of VRLA battery cells, can the capacity of the measured battery be accurately determined?
I can't. The internal resistance of a battery is closely related to its capacity, but there is not a general linear relationship between the two, so internal resistance cannot be directly used to represent the accurate capacity of a battery. But if the internal resistance of a single battery exceeds a certain empirical value, the battery will not be able to discharge its due capacity. Therefore, internal resistance can be used as an indicator to evaluate the performance of the battery.
20. What is the most effective use of an internal resistance tester in daily maintenance work? As a daily maintenance and use of batteries, it is the most effective supplementary testing besides capacity testing.
How to use internal resistance to judge the quality of a battery?
The main way to judge the quality of a battery is to use the incremental changes in internal resistance or the trend of increasing internal resistance.
22. What is thermal runaway?
Thermal runaway refers to a cumulative positive feedback chain reaction between the charging current and battery temperature during constant voltage charging of a battery, which gradually damages the battery. The consequence is that the battery casing swells and loses water.
What are the advantages and disadvantages of capacity testing and internal resistance testing? Capacity testing is the only accurate method for measuring battery capacity. The disadvantages are:
1. The workload is heavy and may pose a threat to the running system during testing; 2. The use of specialized equipment incurs high costs; 3. Accelerate battery aging. Although internal resistance testing cannot accurately measure the capacity of a battery, it can make judgments on the quality of the battery. Its advantages lie in:
1. Small testing workload, online testing, will not pose a threat to the running system; 2. Low cost of using equipment; 3. It will not cause damage to the battery.
What are the effects of high current charging and discharging on batteries?
Water loss, easy bending of electrode plates, and detachment of active substances can accelerate battery failure.
What are the common faults of valve controlled sealed batteries during use?
Short circuit, leakage, reverse polarity, sulfation of electrode plates, bending and corrosion fracture of electrode plates, detachment of active substances, capacity loss, abnormal voltage, short cycle life.
What are the reasons for excessive voltage drop in battery packs (usually the entire battery pack has a voltage drop of more than 1V)? The main reasons are
(1) The battery pack wiring is too long and the design is unreasonable; (2) The screws inside the battery pack are loose, resulting in high contact resistance.
27. What are the solutions for large voltage differences in battery packs? There are solutions available
(1) Balanced charging (2) charge discharge cycle
(3) Open the valve for 24 hours (4) and observe the extended usage time
28. What are the reasons for battery leakage and how to solve them? reason:
a) Aging of sealant leads to cracks at the sealing area;
b) The battery is severely overcharged, and different types of batteries are mixed, resulting in poor gas recombination efficiency of the battery; c) Acid splashes out during acid infusion, causing false leakage. resolvent:
1) Wipe the battery that may be a false leak and observe it later; 2) Replace the leaking battery.
What is the relationship between discharge depth and cycle life of VRLA batteries? The deeper the discharge depth, the shorter the cycle life.
What are the storage requirements for batteries?
Require good ventilation facilities, dryness (preferably with air conditioning), and maintain an ambient temperature of around 25 ℃; Strong ground bearing capacity; After storing for 3 months, it is necessary to replenish electricity.
Why does the battery sometimes' fail to discharge 'during use?
The battery is discharged in a normal float charging state, and if the discharge time does not meet the requirements, the battery voltage on the system has already dropped to its set value, and the discharge is in a terminated state. The reason is:
(1) The discharge current of the battery exceeds the rated current, resulting in insufficient discharge time, while the actual capacity reaches; (2) Insufficient actual float charging voltage during float charging can cause long-term undercharging of the battery, insufficient battery capacity, and may lead to battery sulfation;
(3) Loose connection strips between batteries result in high contact resistance, causing a large voltage drop during discharge and a rapid voltage drop across the entire battery pack (the opposite is true during charging, where the voltage of this battery also rises rapidly);
(4) When discharging, the ambient temperature is too low, and as the temperature decreases, the battery discharge capacity also decreases.
What are the hazards of battery short circuit? May cause a fire and render the battery unusable.
What are the reasons for battery reverse polarity?
The reverse polarity of a battery refers to the change in the positive and negative poles of the battery. Reverse polarity is manifested in two aspects: one is due to the reverse polarity of a single cell battery or the reverse polarity of the entire battery pack during installation; The second issue is that when a battery is used in series during capacity discharge, it may lose capacity due to one battery having a lower capacity or completely losing capacity. What are the reasons for the sulfation of electrode plates? There are several reasons for the sulfation of electrode plates:
1) Insufficient initial charging of the battery or prolonged interruption of initial charging time; 2) Long term insufficient charging of the battery; 3) Failure to charge in a timely manner after discharge;
4) Frequent overcharging or low current deep discharge;
5) If the electrolyte density is too high or the temperature is too high, lead sulfate will deeply form and be difficult to recover; 6) The battery has been idle for a long time and has not been regularly charged due to long-term disuse; 7) The electrolyte is impure and self discharge is large;
8) Internal short circuits or excessive water on the battery surface can cause leakage; 9) The low electrolyte level inside the battery causes the exposed part of the electrode plate to undergo sulfation.
What are the methods to solve the sulfation of electrode plates?
Charge repeatedly with low current (0.1~0.2C10A) for a long time until the capacity is restored
36 Where should the installation location of VRLA batteries be far away from? What is the safe distance?
The installation location should be far away from heat sources and places that are prone to sparks; The safety distance should be at least 0.5 meters, and maintenance space should be reserved between groups of batteries and between batteries and other devices.
What are the hazards of not tightening the connecting bolts? What is the required torque for connecting bolts during battery installation? Loose connections can cause an increase in resistance at the connection point, which can easily cause ignition during charging and discharging, and in severe cases, lead to heating, fire, and accidents. The required torque for connecting bolts is 15N · M.
Why can't old and new batteries be mixed? Can't different manufacturers or batteries of different capacities be mixed? Due to inconsistent technical indicators such as internal resistance and capacity, it can cause uneven charging and discharging, leading to chain deterioration.
Why can't batteries with a capacity below 80% continue to be used? Batteries with a capacity below 80% will enter a trend of rapid deterioration. 2、 Maintenance procedures
1. Installation precautions
Customers need to carefully read the product technical user manual and install and use it according to the requirements. Attention should be paid to: (1) The battery should be stored in an environment of 5-30 ℃ before installation and use. If it exceeds 3 months, the battery must be recharged. The method of recharging is to uniformly charge at a voltage of 2.35V per unit (25 ℃).
(2) New and old batteries should generally not be mixed, and batteries from different manufacturers or with different capacities should not be mixed.
(3) The valve controlled battery is 100% charged before leaving the factory, and must be operated carefully to prevent short circuits. (4) During installation, insulated gloves should be worn, insulated tools should be used, and safety should be taken into account.
(5) When connecting the battery, the screws must be tightened, but it is also necessary to prevent excessive force from damaging the copper embedded parts of the pole. The torque for tightening is 15N · M.
(6) According to the prescribed series parallel circuit, start from the positive pole and connect the batteries, columns, layers, and panel terminals in sequence. Be careful not to tighten them first, and tighten them together after the entire group is in place.
(7) Before installing the end connectors and connecting the entire power system, the positive and negative polarities should be carefully checked, and the voltage of each battery and the total voltage should be measured.
(8) When designing the connection method, the lead wires should be as short as possible to reduce wiring resistance.
(9) When two or more batteries are connected in parallel, it is recommended that the cables from each battery to the load be of equal length to facilitate current balance between the batteries during charging and discharging.
(10) Connect the battery lead to the switch power supply and use a multimeter to confirm the polarity of the wiring.
(11) At the end of installation, the system voltage and the positive and negative directions of the battery should be checked again to ensure correct battery installation.
2. Parameter settings
VRAL batteries can be used in an environment of -15 ℃ to 45 ℃, with the optimal operating temperature being 15-25 ℃. The parameters for the 25 ℃ switch power supply are set as shown in Table 1, and other temperatures are adjusted according to Table 2. Table 1 Parameter Settings for Switching Power Supply
Parameter content setting: Floating charging voltage 2.23V, average charging voltage 2.35V, charging current limit 0.1C10, high voltage alarm value, average single cell 2.4V, low voltage alarm value, average single cell 1.9V, battery temperature compensation coefficient 3mV/battery temperature too high 35 ℃
LVDS off voltage average cell 1.83V LVDS reset voltage average cell 2.05V average charging cycle 90 day cycle average charging time
10h
Starting condition (capacity/voltage) for recharging and equalization: Release over 20% capacity, float charge to equalization condition of 50mA/Ah, power outage equalization time of 10h, exit equalization condition of 5mA/Ah, continue equalization time of 3h, charging capacity multiple not less than 1.2 times, battery scrap index less than 80% of rated capacity, battery terminal voltage difference
Floating charge/open circuit (50 mV/20 mV)
3. Charging of batteries (1) float charging
The relationship between float charging voltage and temperature: Float charging operation is the optimal operating condition for batteries. During operation, the battery is always in a fully charged state, and operating under this condition will achieve the longest service life of the battery. During float charging operation, the charging voltage should be adjusted appropriately according to the ambient temperature. Generally, for every 1 ℃ increase in temperature, the float charging voltage of each battery should be adjusted accordingly