EV battery

How to balance mismatched lithium-ion batteries?

by：Vglory 2021-03-26

1. The error of lithium-ion battery capacity is absolute. With the use of lithium-ion batteries, this error is increasing. The factory configuration can only delay the time of the obvious error of the lithium-ion battery, and eventually there will be a serious capacity error. Therefore, the error is absolute, and the purpose of the lithium-ion battery protection system and the equalization system is only to alleviate this error and prevent the danger caused by the error. Capacity balance is impossible and should not be pursued as a balance goal. 2. At present, there is a capacity compensation method, which is to take out some power from the high-capacity lithium-ion battery to compensate for the consumption of the low-capacity battery. There is no problem with this method in theory, but it is very troublesome in practice, especially in terms of efficiency. 3. The charging voltage equalization is necessary, otherwise some of the lithium-ion batteries will be undercharged in the later stage of charging. Some lithium-ion batteries are overcharged and undercharged, which affects the life of the battery, and overcharge can cause danger. 4. It is better to do discharge equalization than to do under-voltage protection, so that any single lithium-ion battery will be powered off when under-voltage occurs to prevent the danger caused by over-discharge. 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 post: Do you know the four major factors affecting lithium-ion batteries?

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