Button-type lithium cell sealing structure and sealing method

Abstract

The invention discloses a button-type lithium cell sealing structure and sealing method. The button-type lithium cell sealing structure comprises a cell cover, a sealing ring and a cell shell. The cell cover is of a covered edge structure; the covered edge structure forms a first covered edge, a second covered edge and a third covered edge; a locked edge section and a sealed section are formed at the third covered edge; the cell shell is of a sealed edge structure, and the sealed edge structure forms a first sealed edge, a second sealed edge, a third sealed edge and a fourth sealed edge; and the first covered edge is pressed against the fourth sealed edge by a sealing ring, the second covered edge is pressed against the third sealed edge by a sealing ring, the locked edge section of the third covered edge is pressed against the second sealed edge by a sealing ring, and the sealed section of the third covered edge is pressed against the first sealed edge by a sealing ring. According to the button-type lithium cell sealing structure disclosed by the invention, the covered edge structure of the cell cover and the sealed edge structure of the cell shell are optimized, and a liquid leakage phenomenon caused by damage and breakage of the sealing rings in the sealing process is prevented, so that integral sealing performance is improved.

Description

technical field [0001] The invention relates to the technical field of button-type lithium batteries, in particular to a sealing structure and a sealing method for button-type lithium batteries. Background technique [0002] Such as figure 1 As shown, it is a cross-sectional view of a traditional button-type lithium battery cell 10 before the sealing of the battery cell. The traditional button-type lithium battery cell 10 includes: a battery cell cover 100 (such as image 3 shown), sealing ring 200 (such as Figure 4 shown), the battery case 300 (such as Figure 5 shown), core 400. The assembly process of the traditional button-type lithium battery cell 10 is as follows: first, the sealing ring 200 is placed on the battery case 300; then, the winding core 400 is welded with the battery case 300, and the winding core 400 is welded with the battery cover. 100 welding; then, the core 400 is put into the cell shell 300, and the cell cover 100 is covered; finally, the cell co...

AI Technical Summary

Problems solved by technology

[0003] This button-type lithium battery cell 10 has the following technical problems: a housing arc groove 310 with a radius of 0.35 mm is formed at a distance of 0.7 mm from the opening edge of the battery case 300, and a radius groove 310 is formed at a distance of 1.3 mm from the opening edge of the battery cover 100. The arc groove 110 of the cover body is 0.5mm, because the size of the arc groove 310 of the shell and the arc groove 110 of the cover body is too small, the machining accuracy is difficult to guarantee, especially when the special equipment is rotated and sealed (such as figure 2 As shown), the cell cover 100 swings during the rotating sealing process, and the arc groove 310 of the housing is too small to cut the sealing ring 200 like a cutter, so the sealing ring 200 is easily damaged and ruptured, resulting in liquid leakage , so that the button type lithium cell 10 is directly scrapped

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