Fusing structure for battery cell and battery module

Abstract

The embodiment of the invention provides a fusing structure for a battery cell and a battery module, and relates to the technical field of new energy automobile lithium ion battery cell products. The fusing structure for the battery cell comprises a tab laser welding area, a pole laser welding area and a fusing area. The fusing area is connected between the tab laser welding area and the pole laser welding area; the fusing area is provided with a plurality of grating strips extending along the current direction; the plurality of grating strips are sequentially arranged at intervals along a first direction forming an included angle with the current direction; the plurality of grating strips comprise at least two grating strips with different lengths; when the battery cell is short-circuited, abnormal large current flows through the battery cell, the grid strip with the shortest length is fused preferentially, and then the subsequent longer grid strips are triggered to be fused in sequence until all the grid strips are fused, so that the circuit is cut off, and an overheating protection effect is achieved. When fast charging and discharging are needed, the heat dissipation area is increased through the multiple grid strips, the heat dissipation efficiency is improved, the fast charging rate requirement is met, and compatibility of short circuit overheating protection and fast charging heat dissipation requirements is achieved.

Description

technical field [0001] The application belongs to the technical field of new energy automobile lithium-ion battery products, and more specifically, relates to a battery fuse structure and a battery module. Background technique [0002] Lithium-ion batteries are usually used as the main power battery due to their ability to be recharged repeatedly. When the lithium-ion battery cell has an internal short circuit or an external short circuit, the current will increase, and the large current generated will cause the heat to rise sharply, and then the battery cell will cause thermal runaway of the lithium battery due to excessive heat, and a fire and explosion will occur. [0003] In view of unsafe accidents caused by excessive temperature rise that cause fire and explosion, the fuse area of ​​the battery core can be designed at the tab of the battery core. For example, by punching openings at the cell lugs to form the necks. [0004] When the cell is short-circuited, the cross...

AI Technical Summary

Problems solved by technology

[0005] However, the existing cell fusing zone structure is only suitable for low-rate charging and discharging. When high-rate charging and discharging is required, it is easy to cause the internal temperature of the battery to rise, which limits the fast charging rate.

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