A thermal management device for a lithium-ion battery pack

Abstract

The invention provides a thermal management device for a lithium-ion battery pack, comprising: a battery pack that is in close contact with a heat conduction component and is fixedly connected; a heat conduction component including a heat conduction fixed bracket and a heat conduction sliding bracket; There is a key that is connected with the keyway; there is a gap between the heat-conducting fixed bracket and the heat-conducting sliding bracket; a through hole I is provided in the middle of the heat-conducting fixed bracket; a through-hole II and a wire groove are provided in the middle of the heat-conducting sliding bracket; the drive assembly includes Compression spring, stainless steel wire and shape memory alloy wire, the two ends of the stainless steel wire are respectively connected with the two ends of the shape memory alloy wire to form a closed loop; the heat dissipation cold plate is provided with a cooling fluid pipeline inside. The invention uses shape memory alloy wires and compression springs to passively control the heat dissipation of high-temperature battery cells, while reducing the temperature of the battery pack, it simply and effectively controls the temperature difference of the battery pack within a reasonable range and improves the temperature consistency of the battery pack.

Description

technical field [0001] The present invention relates to the technical field of new energy vehicles, in particular to a heat management device for a lithium-ion battery pack. Background technique [0002] In order to improve air quality, cope with climate warming, and protect the ecological environment, the state encourages new energy vehicles to replace traditional fuel vehicles. The core unit of electric vehicles is the power battery pack. Lithium-ion batteries have the characteristics of high energy density, low self-discharge rate, and long cycle life, making them widely used in electric vehicles. However, the operating conditions of electric vehicles are more complicated. Lithium-ion batteries will generate a lot of heat when they are discharged at a high rate during use. High temperature will not only affect the cycle life of lithium-ion batteries, but will also cause lithium The thermal runaway of the ion battery can cause combustion or explosion. Therefore, an effec...

AI Technical Summary

Problems solved by technology

Due to the heating of the battery pack, the temperature of the cooling fluid in the flow direction gradually increases, and the heat dissipation capacity gradually decreases, resulting in an increase in the temperature difference between the battery cells in the battery pack, which has a great impact on the working efficiency and cycle life of the battery pack.

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