Battery system with cooling and balancing functions and control method

Abstract

The invention belongs to the technical field of batteries, and particularly discloses a battery system with cooling and balancing functions and a control method. The battery system comprises a batterypack and a cooling and balancing system. A shell is arranged outside the battery pack; a signal acquisition unit and a control unit are arranged in the shell; the signal acquisition unit is connectedwith the battery pack and used for acquiring temperature and voltage information of the battery pack; the cooling and balancing system comprises a refrigeration sheet group; the power supply end of the refrigeration sheet group is connected with the battery pack or an external power supply end; and the control unit controls the external power supply to output electric energy to the refrigerationsheet group for refrigeration, or controls the battery pack to output electric energy to the refrigeration sheet group to realize battery pack balancing while the refrigeration sheet group realizes refrigeration by utilizing balanced electric energy output by the battery pack. With the adoption of the technical scheme, the refrigeration sheet group is controlled to operate through the signal acquisition unit and the control unit, so that the battery pack has rapid balancing repair capability during charging, and the internal temperature rise caused by charging can be reduced.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a battery system and a control method with a cooling and equalizing function. Background technique [0002] During the charge-discharge cycle of a multi-string battery pack, due to the difference in characteristics between the individual lithium batteries connected in series, the use of a period of time will cause an imbalance between the lithium batteries connected in series, and long-term use will lead to the overall performance of the multi-string battery pack. Reduced service life. Therefore, it is necessary to carry out balanced repair management on multi-string battery packs. At the same time, during the charging and discharging process of the battery pack, the temperature is a key factor affecting the life of the lithium battery. In the current known lithium battery, in the stage of passive balanced charging, the balanced load adopted is to convert excess electric energy...

AI Technical Summary

Problems solved by technology

The traditional equalization method with low heat generation has weak equalization ability and cannot meet the real-time balance repair needs of the battery

Using traditional methods to achieve higher balancing capability will lead to higher temperature of the battery system. At the same time, if the existing method is used to cool down, the cost will increase significantly; if the temperature is not lowered, it will have a greater impact on the service life of the battery and increase the safety hazard of the battery pack.

Images