Method, device and circuit for heating battery pack and battery pack

Abstract

The invention discloses a method, device and circuit for heating a battery pack and the battery pack, and the method for heating the battery pack comprises the following steps: obtaining a heating instruction, and sending the heating instruction to a direct current conversion power supply DC / DC, wherein the direct current conversion power supply DC / DC heats the battery pack to a preset temperature according to the heating instruction. According to the technical scheme, through the charging and discharging process between two or more large modules or modules in the battery pack, the heat of the battery pack is gathered, the temperature of the battery pack is increased by means of electrochemical heat, ohmic heat and the like generated in the battery cells, and the problems of normal charging and discharging of the battery pack under the low-temperature condition and normal charging and running of a vehicle are solved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a method, device, circuit and battery pack heating method. Background technique [0002] At present, due to the limitation of the current cell technology, the power battery pack of new energy vehicles will be greatly affected in the low temperature environment, especially in sub-zero conditions, and the charging and discharging performance will be greatly affected, and the performance will be seriously attenuated by more than half. [0003] In order to solve this problem, to ensure that the battery pack can be charged and discharged normally at low temperature, and that the vehicle can be charged and driven normally, the current practice in the industry basically uses various external devices to provide heat to the internal modules and batteries of the battery pack. The core is heated by conduction, such as direct or indirect technologies and methods such as...

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Problems solved by technology

[0004] However, the above methods basically require external power supply, and then convert the electric energy into heat energy, and then conduct the heat to the cells and modules in the battery pack through various heat conduction components. Pipelines, pumps, valves, etc., liquid cooling plates and fluids, etc., so that the temperature of the battery cells and modules in the battery pack rises to the normal operating temperature, thus resulting in many additional equipment and components and complex processes. The conduction loss is large, the heating efficiency is low, and various safety issues such as high-voltage insulation need to be considered

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