Fault diagnosis apparatus and method of battery heating system

Abstract

The invention discloses a fault diagnosis apparatus and method of a battery heating system. The fault diagnosis apparatus comprises a battery charging system, the battery heating system, a battery management system. The battery charging system is used for charging a battery pack in the battery charging system. The battery heating system is connected with the battery charging system and is used for heating the battery charging system when the temperature of the battery charging system does not satisfy a preset charging condition. The battery management system is connected with the battery heating system and is used for detecting whether the battery heating system is normal or not, and if not, disconnecting the battery charging system and the battery heating system and diagnosing the fault of the battery heating system. The fault diagnosis apparatus may diagnose the fault position of the battery heating system when a battery system is not disassembled and determine whether the fault is caused by the abnormality of a heating circuit in the battery heating system, and may improve the safety performance of the battery system and prolong the service life of the battery system by regularly detecting the potential safety hazards of the battery heating system.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a fault diagnosis device and method for a battery heating system. Background technique [0002] The battery system is a system composed of at least one battery pack, corresponding accessories and mechanical assemblies to provide electric energy for the entire electric vehicle. The battery pack in the battery system may be a lithium-ion battery pack or a storage battery pack. However, although lithium-ion batteries and storage batteries have many advantages, in practical applications, some performances are still not well understood. There is a safety hazard when charging. [0003] In order to improve the performance of the battery in a low-temperature environment, a battery heating system or device can be introduced into the battery system, and the battery pack in the battery system can be heated through the battery heating system or device, so that the temperature of ...

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Problems solved by technology

[0004] In order to achieve a better heating effect, the heating films will be connected in series or in parallel. However, when the battery heating system fails and the battery system is diagnosed, the following problems often exist: (1) Due to the complex structure of the heating circuit, Therefore, it is difficult to eliminate the faults in the part of the circuit such as the heating film, the controller, etc.; (2) Since the battery system on the equipment needs to be disassembled and used, professional equipment and staff are required, and the professional requirements are relatively high, resulting in labor and technical costs. Relatively high; (3) The use environment of the battery system is different, and the box will have different IP level requirements. If the resistance value or conduction performance of the battery heating system is unpacked, the sealing of the box will be affected, resulting in the use of the battery system. Reduced lifespan

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