Mixed heat dissipation device for lithium battery pack

Abstract

The invention discloses a mixed heat dissipation device for a lithium battery pack, and relates to the technical field of battery thermal management. The device comprises a box body, an air cooling assembly, a phase change energy storage heat conduction plate, a liquid cooling assembly, a plastic box cover and a plastic bottom plate. A plurality of groups of placing holes for placing battery cellsare formed in the plastic bottom plate. Each group of placing holes consists of a plurality of placing holes which are arranged in parallel and obliquely. Two adjacent groups of placing holes are symmetrically arranged to form an air duct for airflow to pass through. An included angle between the placing hole and the front surface of the box body is 10 +/-5 degrees. The bottom of the battery cellis positioned at the upper part of the placing hole. The phase change energy storage heat conduction plate is mounted at the lower part of the placement hole, and the upper and lower ends of the phase change energy storage heat conduction plate are contacted with the battery cell and the liquid-cooling assembly. The mode of combining air cooling, the phase change composite board and liquid cooling is adopted, rapid heat dissipation of the lithium battery can be achieved, the heat dissipation efficiency of the lithium battery is improved, the defect that the heat dissipation efficiency is lowin a pure liquid cooling or pure air cooling mode is overcome, and heat dissipation of the battery pack is more uniform and more efficient.

Description

technical field [0001] The invention belongs to the technical field of battery heat management, and in particular relates to a lithium battery pack hybrid cooling device. Background technique [0002] To be used in electric vehicles, the power battery must go through assembly, debugging and other processes, and finally appear in the form of a battery pack. The battery pack is a closed system, and its heat dissipation problem has always been one of the topics of concern. If the heat dissipation effect of the battery pack is poor, it will Lead to reduced battery life, severe cases will cause the battery fire, explosion, a serious threat to people's lives and property safety. [0003] In order to make the battery pack more efficient and more uniform heat dissipation, many technical scholars have proposed many solutions. At present, there are mainly two forms of air cooling and liquid cooling in the market. However, air cooling generally has low battery temperature on the air in...

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Problems solved by technology

[0002] To be used in electric vehicles, the power battery must go through assembly, debugging and other processes, and finally appear in the form of a battery pack. The battery pack is a closed system, and its heat dissipation problem has always been one of the topics of concern. If the heat dissipation effect of the battery pack is poor, it will Lead to reduced battery life, severe cases will cause battery fire, explosion, a serious threat to people's lives and property safety

[0003] In order to make the battery pack more efficient and more uniform heat dissipation, many technical scholars have proposed many solutions. At present, there are mainly two forms of air cooling and liquid cooling in the market. However, air cooling generally has low battery temperature on the air inlet side and low battery temperature at the air outlet. The disadvantage of high battery temperature on the side is that it cannot cool down the battery evenly; although the cooling effect of the liquid cooling mode is better than that of air cooling, if the battery pack is discharged at a high power, the heat generated by the battery pack in an instant is difficult to guarantee to dissipate quickly

[0004] In view of the heat dissipation disadvantages of the current lithium battery pack, in order to make the heat dissipation of the battery pack even and more efficient, this proposal proposes a hybrid heat dissipation method for the lithium battery pack

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