1, The battery pack cannot be charged
A. If it is a newly assembled battery pack, measure the voltage of each battery cell of the cable and check whether the cable sequence is wrongly connected or the individual cables are disconnected.
B. If the abnormality occurs after a period of use, check whether there is a loose screw (the cable is crimped or screwed), or the connection between the cable and the socket of the protection board is loose. Also, measure the voltage of each battery cell. Some protection boards do not support 0V battery charging, and a single battery cell needs 1V or more to charge.
C. The battery is fully charged and assembled. If the maximum voltage of a single cell of the battery pack is greater than the overcharge release voltage of the protection board, the protection board may be over-voltage protection and locked and cannot be charged. Lower the battery voltage a little bit and you can charge normally.
D. The battery pack is nearly full. For example, the 10S ternary battery pack has a voltage of 41.5V, a charger 42V, and a protection board with a discharge switch on the same port for charging and discharging. The discharge switch can be turned on to charge, and the discharge switch can not be turned off.
E. When soldering the C-line, short-circuit the G pole of the charging MOS and the C-pad.
F. Whether the C-pad of the quantity protection board and the positive B+ voltage of the battery pack are the normal voltage of the charger, if not, check whether the fuse and electronic wire of the charging circuit are open.
G. Part of the protection board has a charging temperature protection function, and the temperature detection probe can be damaged or fall off, which can cause the charging to be impossible.
H. Part of the protection board has a low-temperature charging protection function. If the ambient temperature is lower than the charging low-temperature protection value, it cannot be charged.
I. Part of the protection board has the function of charging high-temperature protection. If the ambient temperature is higher than the charging high-temperature protection value, it cannot be charged. Especially after riding in summer, the battery temperature is relatively high, and charging may occur immediately after charging high-temperature protection, resulting in failure to charge.
J. The charger output voltage does not match. Or the charger interferes too much, which affects the normal operation of the protection board.
K. After the battery pack is discharged to under-voltage protection, it cannot be charged when connected to a charger, but it can be charged when connected to a DC stabilized power supply. The charger is the kind that needs to detect that the battery pack has an output voltage before it can be charged.
Solution: 1. Replace it with an ordinary charger, it can be charged without detecting that the battery has an output voltage. 2. Use a protection board with fully separated charging and discharging ports. 3. The protection board is equipped with an emergency switch, which cannot be charged when connected to the charger. Press the emergency switch.
2, The battery pack cannot be discharged
A. If it is a newly assembled battery pack, measure the voltage of each battery cell of the cable and check whether the cable sequence is wrongly connected or the individual cables are disconnected.
B. If the abnormality occurs after a period of use, check whether there is a loose screw (the cable is crimped or screwed), or the connection between the cable and the socket of the protection board is loose.
C. The battery is undervoltage. Connect the charger to charge, and charge the battery core voltage higher to discharge normally.
D. The battery pack is fully assembled, or the protection board is touched after being fully charged, and the protection board discharges protection malfunctions. Some protection boards cannot release the discharge protection when the load is disconnected. You need to connect a charger (without voltage detection function). Normal discharge.
E. When soldering the B-/C- lines, the paste flux is used to flow to the control circuit of the protection board, which causes the protection board to work abnormally.
F. Check whether the fuses and electronic wires of the discharge circuit are open.
G. Part of the protection board has a discharge temperature protection function, and the temperature detection probe can not be discharged due to damage or fall off.
H. Part of the protection board has a low-temperature discharge protection function. If the ambient temperature is lower than the discharge low-temperature protection value, it cannot be discharged.
I. Some protection boards have a high-temperature discharge protection function. If the ambient temperature is higher than the high-temperature discharge protection value, it cannot be discharged.
J. The protection board with discharge switch, the discharge switch is not connected, disconnected, damaged, or the switch wire is broken or falling off, which will cause the discharge to fail.
K. The electronic load can be discharged and cannot be used for riding. It may be that the battery assembly car instantly charged the controller capacitor with a high current, which caused the protection board to short-circuit protection. Generally, the battery pack is unplugged and then installed in the car. It can be used normally. This kind of problem is related to the internal resistance of the cell, the size of the controller's capacitance, and the capacitive load-carrying capacity of the protection board. It can be solved by increasing the capacitive load capacity of the protection board.
Three, charging is not protected
A. Insufficient battery power of the customer's multimeter leads to a large value measured by the multimeter. After fully charged, the actual cell voltage of a single cell is the normal 4.20V, but the multimeter shows 4.30V or greater. The customer mistakenly believes that the battery is overcharged without protection.
B. Check whether the C-wire welding position is correct. If the B- and C-wires are welded reversely, the protection board has no charge and discharge protection function; if the C-wire is welded to the P-pad, there is no charge protection function.
C. The charger is abnormal. A damaged charger may output a high voltage above 100V, resulting in damage to the protection board and overcharging of the battery.
D. The charging MOS tube of the protection board is broken down (the resistance between C- and P- after the protection board is powered off, if it is infinite, M above is OK and normal; Ω and K are the MOS tubes are broken). The common reasons for the damage of the charging MOS of the protection board are: 1. The charger, especially the high-power charging cabinet, has a high voltage at the moment of charging protection on the protection board, which causes the high voltage breakdown of the charging MOS; 2. The current is greater than the maximum current that the protection board charging MOS can withstand. The charging MOS is overheated and damaged. For example, the half-port board supports a maximum charging current of 5A and a maximum discharge current of 15A. If the customer connects to the same port, the charging MOS will exceed 15A when the 15A is discharged.
E. The charging protection control circuit of the protection board or the charging MOS drive circuit is damaged.
4, the discharge is not protected
A. Check whether the C-wire welding position is correct. If the B- and C- wires are welded reversely, the protection board has no charge-discharge protection function;
B. The protection board with a fully split port structure and the charging terminal can be discharged. There is no discharge protection when the charging terminal is discharged.
C. The protection board discharges the MOS tube breakdown (measure the resistance between B- and P- after the protection board is powered off if it is infinite, the above M is OK and normal, and Ω and K are the MOS tubes are broken). The common reasons for the damage of the protection board discharge MOS are 1. The load, especially the high-power discharge cabinet, has a negative high voltage at P+P- at the moment of discharge protection on the protection board (the P- terminal is tens of volts higher than the P+ terminal), which leads to the discharge of the MOS high voltage Breakdown; 2. The current is greater than the maximum current that the discharge MOS of the protection board can withstand, causing the discharge MOS to be overheated and damaged.
D. The protection board discharge protection control circuit or the discharge MOS drive circuit is damaged.
5, power off as soon as it starts
A. Unplug the battery from the car and charge it with a charger. If charging is possible, measure whether the output voltage of the protection is equal to the total voltage of the battery. If they are equal, remove the resistance and increase the discharge overcurrent protection value of the protection board.
B. Whether the B-line is thick enough and not long and thin. If the B-line is thin and long, the first section of the excessive current is prone to under-voltage protection.
C. Whether the serial wire or nickel sheet connecting the two battery cells is thick enough and not long and thin. If the slender is too large, Undervoltage protection is prone to occur.
D, B-line, or C-line is connected with screws. After the screws are loosened, the contact resistance becomes larger, the static output voltage is normal, but there is no output under load or the output voltage is low, and the screw connection position will be severely heated.
E. Poor consistency of the cells or false welding of some cells, resulting in a low capacity of one string; or serious imbalance of the battery pack, and the voltage of one string is much lower than that of the other cells. If the voltage of the string of batteries is reduced due to excessive current, it is easy Undervoltage protection has occurred.
F. The power tool with a direct drive motor has a relatively large starting current. If the battery pack is connected to an electronic load, it can be discharged, and the power tool is powered off as soon as the power tool is installed. It is necessary to increase the discharge overcurrent protection value of the protection board or the discharge overcurrent protection delay.
G. The electronic load can be discharged, and the power is cut off as soon as the vehicle is started. It may be that the battery assembly car instantly charged the controller capacitor with a high current, which caused the protection board to short-circuit protection. Generally, the battery pack is unplugged and then installed in the car. It can be used normally. This kind of problem is related to the internal resistance of the cell, the size of the controller's capacitance, and the capacitive load-carrying capacity of the protection board. It can be solved by increasing the capacitive load capacity of the protection board.
6. Sudden power failure during riding
A. If it is normal to ride at full power, the sudden power failure is likely to occur when the battery is almost empty. The common cause is that there is a string of low voltage and under-voltage protection;
B. The cable is loose and has poor contact or falls off;
C. Sudden power failure occurs only when climbing or crossing a hurdle, and it also occurs when riding with a full battery. It is common for the protection board to have discharge overcurrent protection, and it is necessary to increase the discharge overcurrent protection value of the protection board.
D. If the sudden power failure occurs after riding for a period of time in high-temperature weather in summer, it is common for the protection board to discharge high-temperature protection (maybe built-in temperature protection, or it may be external high-temperature protection)
E. The controller and motor of the car are abnormal or do not match the battery. For example, an 800W motor is equipped with a 5AH battery pack.
7, power off as soon as you refuel
A. The voltage of a single cell is too low, and the Undervoltage protection is in place. Unbalanced battery packs need to see if the battery cell with the lowest voltage drops below the Undervoltage value.
B. The flat cable and battery connection cable are screwed, and the contact resistance is relatively large. Caused a large current discharge, the voltage drop of the two points connected by the screw was large, and the Undervoltage protection action occurred.
C, B-line, and other battery connection wires are not thick enough to cause high current discharge, and the voltage drop of the wire or nickel sheet is large, and the Undervoltage protection action occurs.
D. The overcurrent value of the selected protection board is too small, and the gas throttle causes discharge overcurrent protection.
8. Fully charged, the voltage drops
A. The battery core is damaged.
B. The discharge MOS of the protection board is not turned on. Refer to the situation where the battery pack cannot be discharged.
9, not far enough
A. Poor spot welding of the cells causes some cells not to be connected. For example, if the 8S cell of the 10S4P battery pack is falsely welded, the 8S cell is equivalent to the only 3P.
B. After one hundred cycles or the performance of the battery pack is damaged when the battery is discharged to close to 0V, the capacity of the battery pack will be attenuated.
C. The battery pack is seriously unbalanced, and Undervoltage protection occurs early, which is equivalent to the attenuation of the battery pack capacity.
D. The design of the battery pack assembly process is unreasonable. For example, connecting two battery cells with a longer electronic wire or a thinner nickel sheet may cause a large difference between the detection voltage of the protection board and the battery cell voltage, resulting in an overvoltage during charging. Protection, under-voltage protection occurs in advance of discharge.
E. The aging of the motor leads to low efficiency.
F. Lithium battery capacity attenuation in a low-temperature environment in winter.
G. The road conditions are bad, or overloaded.
H. Riding after high-temperature exposure in summer, the protection board is discharged and protected against high temperature.
10, the discharge protection board heats up
A. The discharge current exceeds the maximum discharge current of the protection board, causing the protection board to heat up.
B. The half-port protection board connects the discharge negative wire to the C-pad.
D. Part of the hardware protection board is discharged in an overvoltage state, and the charging MOS will not automatically turn on. The protection board with the same port structure for charging and discharging discharges under overvoltage conditions. The discharge current is discharged through the body diode of the charging MOS. A larger discharge current will cause serious heating. When the battery cell voltage drops to the overvoltage release value after discharging, the charging MOS is turned on and the temperature starts to drop slowly.
E. The charging MOS or the discharging MOS is damaged or the driving voltage is abnormal, which causes serious heating of the charging and discharging MOS.
F. The battery core heats up abnormally, and the high temperature is transmitted to the protection board.
11, the protection board heats up
A. The charging current exceeds the maximum charging current of the protection board and the protection board heats up.
B. When the charge is almost full, the equalizing resistor heats up
C. The general hardware protection board turns off the discharging switch to charge, and the discharging MOS will not automatically turn on. The protection board with the same charging and discharging port or half-port structure is charged when the discharge switch is turned off. The charging current is charged through the body diode of the discharging MOS. The 10A charging current multiplied by a diode voltage drop of 0.7V will cause a loss of 7W. So there will be severe fever.
D. Part of the hardware protection board is charged in the Undervoltage state, and the discharging MOS will not automatically turn on. The protection board with the same charging and discharging port or half-port structure is charged under the condition of Undervoltage. The charging current is charged through the body diode of the discharging MOS, and if the charging current is larger, it will cause serious heat. When the battery cell voltage rises to the Undervoltage release value, the discharge MOS is turned on and the temperature starts to drop slowly.
E. The charging MOS or the discharging MOS is damaged or the driving voltage is abnormal, which causes serious heating of the charging and discharging MOS.
F. The battery core heats up abnormally, and the high temperature is transmitted to the protection board.
12, Battery charging bulge
A. Measure the voltage of each cell of the battery pack and make a record.
B. Check whether the charger voltage is normal. If the battery cells are balanced, the battery cell will not be overcharged under normal conditions of the charger voltage.
C. Check whether the C-wire welding position is correct. If the B- and C-wires are welded reversely, the protection board has no charge and discharge protection function; if the C-wire is welded to the P-pad, there is no charge protection function.
D. Check whether the battery cell has mechanical damage or assembly errors.
E. Check whether the charging MOS tube of the protection board is normal. (After the protection board is powered off, measure the resistance between C- and P-. If it is infinite, it is OK if M is above and normal; Ω and K are MOS tubes broken).
13, The battery is empty and there is no electricity.
A. Lithium batteries have self-discharge current, plus the power consumption of the protection board, so half-electric battery packs are generally required to be recharged every 3 months. Discharge to the under-voltage protection battery pack within 24H to recharge. Prevent the battery cell from being discharged to 0V to cause damage to the battery cell.
B. If there is a GPS module or a Bluetooth module that is directly powered by B+B-, then the battery pack cannot be placed for a long time. If the average power consumption of the GPS module is calculated as 10mA, it will consume 7200mAH of capacity if it is left for one month. And there is no under-voltage protection when connected to the B+B- terminal, so it is easy to discharge the battery pack to 0V.
C. The discharge MOS of the protection board has broken down, causing the battery pack to have no under-voltage protection and discharge to 0V.
14, The battery charges quickly and discharges quickly
A. Poor spot welding of the cells causes some cells not to be connected. For example, the 8S of the 10S4P battery pack has a cell that is falsely welded, and the 8S cell is equivalent to the only 3P, then the 8S will be charged. It rises fast, and the voltage drops fast when discharging.
B. After one hundred cycles or the performance of the battery pack is damaged when the battery is discharged to close to 0V, the capacity of the battery pack will be attenuated.
C. The battery pack is seriously unbalanced.
D. The design of the battery pack assembly process is unreasonable. For example, connecting two battery cells with a longer electronic wire or a thinner nickel sheet may cause a large difference between the detection voltage of the protection board and the battery cell voltage, resulting in an overvoltage during charging. Protection, under-voltage protection occurs in advance of discharge.
15, The battery can not be charged or used after being left for too long
A. Lithium batteries have self-discharge current, plus the power consumption of the protection board, so half-electric battery packs are generally required to be recharged every 3 months. Discharge to the under-voltage protection battery pack within 24H to recharge. Prevent the battery cell from being discharged to 0V to cause damage to the battery cell.
B. 0V battery charging is very unsafe. The general protection board does not support 0V battery charging. It needs a single battery cell to charge above 1V.
C. If there is a GPS module or Bluetooth module that is directly powered by B+B-, then the battery pack cannot be placed for a long time. If the average power consumption of the GPS module is calculated as 10mA, it will consume 7200mAH of capacity if it is left for one month. And there is no under-voltage protection when connected to the B+B- terminal, so it is easy to discharge the battery pack to 0V.
16, The distance to run in winter is shorter than in summer
A. Lithium batteries generally have poor low-temperature performance, which is manifested as a sharp increase in the internal resistance of the battery cell. In a low-temperature environment, the output voltage of the discharged cell is significantly lower than that of normal temperature, and it will discharge faster to the Undervoltage protection value. Therefore, it is normal to run shorter distances in winter than in summer.
B. If the protection board has a discharge low-temperature protection function, and the ambient temperature is lower than the discharge low-temperature protection value, the protection board will have a discharge low-temperature protection function and cannot discharge.
C. If the general lithium battery is placed at -20°C for more than 2 hours, the battery cell voltage will drop below the Undervoltage protection value within a few seconds of 1C current discharge, and it will not be able to discharge.
17, The relationship between the protection board, controller, and charger
A. The charger charges the battery pack through the protection board.
B. The battery pack supplies power to the controller through the protection board, and the controller drives the motor.
