Lithium battery pack thermal management system

Abstract

The invention discloses a heat management system for lithium battery packs. The heat management system comprises a battery box body for installing batteries, a temperature adjusting device arranged atthe outer side of the battery box body and a battery box body cover arranged at the top part of the battery box body, wherein the battery box body comprises a bottom plate, U-shaped end-part baffle plates arranged at the two ends of the bottom plate and U-shaped heat-conducting partitioning plates arranged between the two end-part baffle plates; the opening ends of the two end-part baffle platesare oppositely arranged, and the heat-conducting partitioning plates are horizontally arranged; gaps matched with the single batteries in shape and size are arranged between the end-part baffle platesand the heat-conducting partitioning plates and between the heat-conducting partitioning plates; a first phase-change material composite plate is arranged in a cavity formed by the end-part baffle plates; a second phase-change material composite plate is arranged in a cavity formed by the heat-conducting partitioning plates. The heat management system disclosed by the invention has the beneficialeffects that the temperature and the temperature difference of the battery packs are controlled to be in a reasonable range, the problem of cold start of the car and the problems caused by the north-south geographic positions and the summer-winter environmental temperatures to the energy effect, the service life and the safety of the batteries can be improved.

Description

technical field [0001] The invention relates to a heat management system for a lithium battery pack. Background technique [0002] With the massive burning of fossil fuels and the increasingly severe environment, the country's strong support for new energy sources, and the maturing of key technologies for power batteries, it is a general trend that new energy electric vehicles will replace fuel vehicles in the future. The core unit of an electric vehicle is a power battery pack, and the battery pack is fixed in a battery box by a plurality of battery modules connected in series. Lithium batteries are commonly used in the market now, and the ambient temperature when lithium ions work has a serious impact on battery performance. Studies by relevant scholars have shown that working at sub-zero temperatures for a long time will significantly reduce the lithium-ion battery capacity, making it difficult to start the car; when the temperature is higher than 60 degrees, the cycle l...

AI Technical Summary

Problems solved by technology

[0003] At present, the main cooling methods used in the battery thermal management system are air cooling, liquid cooling, heat pipe cooling and phase change material cooling, etc. There are also heating systems, but they all have the characteristics of low efficiency and low reliability.

Affected by the geographical location of the north and the south and the ambient temperature brought by the summer and winter seasons, the same set of battery pack thermal management system devices will show differences when working, which will have an impact on the energy efficiency, life and safety of the battery

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