What problems do you generally encounter when using lithium-ion battery packs for electric vehicles?

1. The lithium-ion battery pack cannot be charged. The lithium-ion battery pack of electric vehicles 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 The group and the consumer are disconnected externally. In order to deal with the above bad phenomena, search in order: whether the charger is connected reversely, whether the positive and negative plugs of the battery pack are connected reversely; restart the electrical appliances to release the protection of the protection board, measure whether the protection board MOS tube has a driving voltage; check whether the wiring connection is loose or broken open. 2. The lithium-ion battery pack cannot be discharged. The lithium-ion battery pack of electric vehicles cannot be discharged normally when used. There are several reasons: low voltage of the lithium-ion battery pack, protection board protection or controller protection; protection board or controller damage; discharge positive and negative The polarity is reversed; the circuit is disconnected or the switch is not opened. In view of the above defects, you can solve the problems by charging the lithium-ion battery pack, looking for the protection board or the line connection. 3. The lithium-ion battery pack is not fully charged. During the cycle of using the lithium-ion battery pack for electric vehicles, the charging stops before the overall cut-off voltage of the lithium-ion battery pack. This situation is due to the inconsistency or capacity of the single string of lithium-ion battery packs. The first full charge or full capacity of the lithium-ion 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 lithium-ion battery pack to keep the voltage of each string consistent. If the capacity difference is large, the battery with the large difference must be replaced. But the most important thing is to check the capacity of the batteries before assembling the battery, otherwise it will be troublesome to re-disassemble the single string out of date. 4. Short battery life. The lithium-ion battery pack of electric vehicles is discharged quickly when used. The reasons for this situation are: the battery is not fully charged; the voltage capacity of a single string has a large difference; the battery pack is short-circuited or the lithium-ion battery Large self-discharge causes the battery pack to be consumed as soon as it is fully charged. For the above defects, the lithium-ion battery pack can be recharged or replaced with bad batteries. 5. Inconsistent voltage of lithium-ion battery packs. Lithium-ion battery packs for electric vehicles are composed of multiple cells in series and in parallel. The requirements for the consistency of cells are very high, even though lithium-ion battery manufacturers have made cells. However, the voltage of each string of batteries will be inconsistent due to battery errors during long-term use of the lithium-ion battery pack, resulting in a decrease in the energy output to the entire battery pack, and then a sudden power failure during use , Sudden decrease in travel schedule, unsatisfactory charge, and incomplete discharge. 6. Ambient temperature Li-ion battery packs have very high requirements for the use environment. Too high or too low temperature will enhance the self-discharge rate of lithium-ion batteries, especially high temperature will greatly reduce the service life of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Proper charging method for lithium-ion batteries in electric vehicles