Battery pack active equalization charging system and control method thereof

Abstract

The invention relates to the technical field of batteries, in particular to a battery pack active equalization charging system and a control method thereof. The battery pack active equalization charging system comprises a battery pack, a charging protection module and a switch module. The control method comprises the following steps: judging whether the battery meets a preset equalization condition or not; and if the battery meets the preset equalization condition, controlling the charging protection module to be switched off and controlling the switch module to be switched on; when the battery meets the equalization condition, disconnecting the battery to be equalized from the charging circuit through the charging protection module and the switch module without influencing the charging ofother batteries. Thus, since the equalizing battery does not need to be discharged in the equalizing process, the problem of excessive loss in the equalizing process can be avoided, and the problem that the capacity and the service life of the battery pack are reduced due to over-discharge of the battery can also be avoided.

Description

Technical field[0001]The invention relates to the technical field of batteries, in particular to a battery pack active equalization charging system and a control method thereof.Background technique[0002]Generally, multiple battery strings are connected in series to form a power battery pack. Even if the inconsistency between the battery cells caused by manufacturing is ignored, the inconsistency will be affected by temperature, internal resistance and aging during the working process. It becomes more and more serious, causing the voltage imbalance of the battery pack. As a result, overcharge and overdischarge will occur during the charging and discharging process, which will eventually affect the cycle life of the battery pack and cause the battery pack to fail prematurely. In order to extend the cycle life of the power battery pack, an effective measure is to control the balance of the battery pack.[0003]The existing equalization control of the battery pack is to collect the actual...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an active equalization control method for battery charging in view of the above-mentioned defects of the prior art, which overcomes the excessive equalization loss in the existing battery equalization control method and the fact that it is easy to cause the battery to be over-discharged and affect Defects of reduced capacity and service life of battery packs

Images