Thermal management system for power battery

Abstract

The invention relates to a thermal management system for a power battery. The thermal management system is mounted in a battery box and comprises at least two core assemblies and a water circulation pipeline, wherein the at least two core assemblies are connected in parallel, arranged on the water circulation pipeline and communicated with the water circulation pipeline; and each core assembly comprises at least two water cooling plates which are connected series. The at least two core assemblies are connected in parallel with the water circulation pipeline, so that the complexity and the manufacturing cost of the whole thermal management system are reduced; each core assembly comprises the water cooling plates which are connected in series; and owing to the connection mode that parallel connection is performed before series connection, the flow fields and the temperature fields of the whole core assemblies are uniform, the heat exchange effect is good, and the phenomenon that the heattreatment effects are inconsistent of a battery module due to an excessively long water circulation path is avoided.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a power battery thermal management system. Background technique [0002] At present, the global automobile industry is facing huge challenges of energy and environmental issues, and the energy utilization rate is high. Therefore, pure electric vehicles that do not pollute the environment are increasingly becoming the direction of the future development of the automobile industry. As the power source of pure electric vehicles, power batteries are a key link to improve vehicle performance and reduce costs, and their temperature characteristics directly affect the performance, life and durability of electric vehicles. In order to ensure that each battery cell in the battery pack works within a reasonable temperature range and maintain the temperature uniformity among the batteries and battery modules in the pack as much as possible, a reasonable design of the battery pack st...

AI Technical Summary

Problems solved by technology

[0003] Existing water-cooling thermal management systems are generally multi-channel parallel or multi-channel series. Multi-channel series connection leads to too long cooling water path, and the temperature of cooling water flowing through the front and rear battery modules is different, resulting in different cooling effects of the front and rear modules.

Over time, it will seriously affect the practical performance and cycle life of the battery module

Multi-channel parallel connection, the total pressure required by the water cooling system is relatively large, and it is difficult to ensure the pressure difference of each parallel branch of the system, which will also lead to inconsistent cooling effects of the battery modules in each parallel branch

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