Vehicle, and fault detection method and device for battery pack

Abstract

The invention provides a vehicle, and a fault detection method and device for a battery pack. The battery pack comprises a plurality of battery modules. The method comprises the following steps: obtaining the temperature of a first detection point of each battery module so as to obtain a first temperature detection value; obtaining the temperature of a second detection point of each battery moduleto obtain a second temperature detection value; and determining the connection state of the corresponding battery module according to the temperature difference between the first temperature detection value and the second temperature detection value of each battery module. Therefore, the temperatures of the two detection points on each module in the battery pack are monitored, so the electric connection state of the battery pack is pre-judged, the characteristics of real-time monitoring and real-time diagnosis on the whole vehicle can be achieved, the potential risk failure of the battery pack is recognized in advance, diagnosis is made in advance, heat diffusion caused by looseness of copper bar connecting bolts in the battery pack is avoided, and the safety of the whole vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a fault detection method and device for vehicles and battery packs. Background technique [0002] The power battery pack is usually composed of multiple battery modules in series, and the battery modules are connected by bolts with high-voltage copper bars. After several years or tens of thousands of kilometers of use of electric vehicles, the torque of the connecting bolts inside the power battery pack will gradually decay. If the vehicle body vibrates during driving, there is a certain probability that the connection of the copper bars between the modules will be loose or falsely connected, and the loose or false connection of the connecting copper bars will cause the power battery pack to fail to work normally. [0003] In related technologies, bolts with thread fastening glue are usually used to fasten the electrical connection. However, the existing problems are that the a...

AI Technical Summary

Problems solved by technology

If the vehicle body vibrates during driving, there is a certain probability that the connection between the copper bars between the modules will be loose or falsely connected, and the loose or false connection of the connecting copper bars will cause the power battery pack to fail to work normally.

[0003] In the related technology, bolts with thread fastening glue are usually used to fasten the electrical connection. However, the existing problems are that the actual assembly process is cumbersome, and the stability of the bolted connection cannot be effectively monitored after sales, and there are risks.

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