Preparation method of lithium battery pack with collision protection and heat dissipation functions

Abstract

The invention discloses a preparation method of a high-power lithium battery pack with collision protection and good heat dissipation functions. A heat-conducting thin plate with round holes is made into hollow triangular prisms, and a lithium battery monomer is placed in each triangular prism; the lithium battery monomers are electrically connected according to circuit requirements; the triangular prism structure is placed in the shell; a wire is led out from the upper part of the shell, molten paraffin is slowly poured into gaps among the shell, the triangular prism and the battery monomers, meanwhile, the shell is vibrated, and the triangular prism structure and the lithium battery synchronously vibrate under the driving of the shell; after all the gaps are filled with paraffin, waiting for the paraffin to be cooled and solidified; and the method has the advantages of good consistency of the single batteries, long service life of the battery pack, large capacity, low cost, easiness in processing, simple structure, strong collision resistance of the battery pack, no bubbles in the phase change material and the like.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a preparation method of a high-power lithium battery pack with a triangular structure using a phase change material. Background technique [0002] High-power lithium battery packs have important applications in many fields, especially lithium battery packs used outdoors have become an important part of electric vehicles. The performance of battery packs is directly related to the performance of electric vehicles. However, the existing lithium battery packs There are still certain deficiencies in the battery pack. [0003] A lithium battery pack contains multiple lithium battery cells, these battery cells are electrically connected in a specific way, and they are put into the casing to form a lithium battery pack. Usually, the shape of the battery cell is cylindrical, square, etc. Commonly there are 18650 cylindrical lithium battery cells, 433861 square lithium batter...

AI Technical Summary

Problems solved by technology

[0013] The existing high-power battery packs have the following defects: during the high-power discharge process, the temperature difference of the battery cells in the battery pack is still large, resulting in a decrease in the overall discharge capacity of the battery pack and seriously shortening the service life of the battery pack; the existing lithium battery pack Heat dissipation technology has high production cost and complex processing technology. When using phase change materials to lower the battery temperature, bubbles, air channels and air gaps are included in the phase change materials, which seriously affect the heat transfer, and the temperature consistency of each battery cell in the battery pack is poor. Due to the disadvantages of the battery cells, the performance consistency of each battery cell is poor; the existing battery anti-collision technology does not fully consider the needs of battery heat dissipation, resulting in conflicts between the anti-collision technology and heat dissipation technology, and the design of the anti-collision structure cannot meet the requirements of the battery at the same time. cooling requirements

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