What are the common problems of lithium battery packs

01 The battery pack cannot be charged. The battery pack cannot be charged during charging. It can be divided into the following reasons: the charger is connected reversely or the charger is faulty; the protection board protection is not restored or the protection board fails; the battery pack and the electrical appliance are externally disconnected. In order to solve the above problems, search in order: whether the charger is connected reversely, whether the positive and negative plugs of the battery pack are connected reversely; re-enable the electrical appliance to release the protection board protection, and measure whether the protection board MOS tube has a driving voltage; find the wiring connection Is it loose or disconnected? 02 The battery pack cannot be discharged. The battery pack cannot be discharged normally when in use. There are several reasons: low battery pack voltage protection board protection or controller protection; protection board or controller damage; discharge positive and negative poles reversed; circuit disconnection or switch Not opened. In view of the above defects, you can take charge of the battery pack, find the protection board or line connection problems to deal with. 03 The battery pack is not fully charged. During the cycle of use, the battery pack will stop before the overall cut-off voltage of the battery pack. This situation is due to the inconsistency or capacity of a single string of battery packs. The first full charge or full capacity of the battery pack is protected by the protection board, so that the battery of other strings is not fully charged and the charging process is stopped. In this case, the equalization charger can be used to recharge the battery pack to keep the voltage of each string consistent. If the capacity difference is large, it is necessary to replace the battery with the large difference. But the most important thing is that the battery cells must be tested and matched before the battery is packaged. Otherwise, it will be troublesome to re-disassemble a single string out of date. 04 The battery pack is discharged quickly when the battery pack is used. The reasons for this situation are: the battery is not fully charged; the voltage capacity of a single string varies greatly; the battery pack is short-circuited or the battery pack is self-discharged, causing the battery pack The battery was consumed as soon as it was fully charged. To solve the above defects, recharge the battery pack or replace bad batteries. 05 Battery pack Low-voltage battery packs have only half of the nominal voltage or negative voltage for the entire battery pack. In this case, when the battery pack has just been assembled, the reason is that the battery pack is connected incorrectly and the positive and negative poles are reversed, or individual batteries are not complete. Connection: If the battery pack is normal after being fully charged but is left to stand or has a low voltage immediately after a period of use, this situation may be due to large battery self-discharge or a slight short circuit in the battery pack. If the nominal voltage is low or negative voltage, the wiring must be re-wired correctly. If the battery is fully charged and the battery is low immediately, the bad battery must be replaced. 06 High temperature of battery pack The temperature of the battery pack is abnormally high and hot during charging or discharging. This situation may be caused by the presence of a high internal resistance battery in the battery pack or a micro-short circuit in the battery pack, which causes the temperature of the battery pack to increase during charging and discharging. . Long-term high-temperature operation of the battery pack is very dangerous. In this case, you must replace the bad battery or repair the micro-short circuit. 07 Short cycle life of the battery pack The battery pack ends within the promised use time. This situation is due to the poor consistency of the battery pack or the poor performance of individual battery packs connected in series, which makes the battery pack insufficiently charged during charging, and again during discharge. Can't finish. In this case, only bad batteries can be selected and replaced. 08 The battery pack suddenly stops working during use. The battery pack suddenly stops working during use. The reason may be that the battery is discharged, and the protection board or controller stops working when the minimum voltage of the protection board or controller is reached; or the current continues to work too much ( For example, when the electric vehicle starts with a load or climbs a hill, it exceeds the design protection current of the protection board or the continuous current of the controller causes the protection board or the controller to stop working, which will cause the battery pack to stop working suddenly. The above situation can be handled by charging the battery pack or restarting the electrical appliances or re-adjusting the parameters to replace the protection board and the controller. 09 The battery pack leaks or catches fire. The battery pack has liquid overflow during use, or the battery pack suddenly catches fire during use. This situation is rare but very dangerous when it occurs. Leaking liquid may also cause fire and explosion, because the overflowing electrolyte lithium hexafluorophosphate is an organic solvent and has a very low ignition point. The reason for this is that the battery cell’s moisture is not completely dried, causing a side reaction inside the battery cell to open the safety valve. The latter Poor sealing of battery core caps and poor protection. The cause of the fire may be a short circuit or liquid leakage inside or outside the battery, the battery pack is close to the fire source and the packaging material is not fireproof, etc. If the battery is only leaking, it is good to replace the leaking battery. If the battery pack catches fire, it must be covered with a fire extinguisher or fire-fighting sand. Do not use water or clothes to extinguish the fire, because water is a conductor and clothes are flammable. 10 Battery pack explosion The battery pack is stationary or explodes during use. This situation is the same as the battery pack fire, but it rarely occurs, but the consequences are serious. The reason for this is also caused by a long-term external or internal short circuit. An external short circuit is equivalent to an instantaneous super current discharge, which exceeds the limit of the battery protection board, and the gas that appears inside is ejected instantaneously, which is very dangerous. The internal short circuit and the poor sealing effect of the diaphragm will also cause an explosion. Regarding the prevention of external short circuit, a protective board can be used to avoid this. The protective board has short-circuit and over-current protection functions to completely eliminate this risk, but the internal short-circuit of the battery must be eliminated by using qualified batteries from a regular manufacturer. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. 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