Secondary battery

Abstract

This application relates to secondary batteries. The secondary battery includes a wound electric core, a first current collector, and a second current collector. The wound electric core includes a wound electric core body, a first pole formed on the wound electric core body ears and second tabs, the first tab and the second tab are respectively located on the two sides of the width direction of the wound cell body and are relatively distributed, the first tab includes The first stacked part extending in the height direction of the wound cell body, there is a gap between two adjacent layers of the first stacked part and a first clamping groove is formed, the first current collector and the The first tab is connected, the second current collector is connected to the second tab, and a first connecting piece is clamped in the first clamping groove, and the second current collector is connected to the second tab. A first through hole communicating with the inside of the wound cell body is opened on the first connector. This solution reduces the difficulty of electrolyte infiltration and exhaust.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a secondary battery. Background technique [0002] The battery includes a bare cell. In the related art, the bare cell can be wound from a positive electrode sheet, a separator, and a negative electrode sheet that are stacked in sequence. The wound bare cell forms a positive electrode at the edge of the positive electrode sheet. The tab is formed on the edge of the negative pole piece, and the positive tab and the negative tab are respectively located on the side of the bare cell and distributed relatively. Both the positive pole lug and the negative pole lug are laminated structures, the positive pole pole is connected to the positive pole pole through the positive pole current collector, and the negative pole pole is connected to the negative pole pole through the negative pole current collector. [0003] When the electrolyte is injected into the battery from the l...

AI Technical Summary

Problems solved by technology

However, in the laminated structure after rolling, the layers are closely attached to each other, and in order to realize the output of electric energy in the bare cell, some layers in the laminated structure are also welded to the current collector, which makes the electrolyte The flow of the battery is not smooth, which makes it difficult for the electrolyte to infiltrate the bare cell

[0004] On the other hand, when the active material on the pole piece is in contact with the electrolyte, a film-forming reaction will occur, an SEI film will be formed, and H 2 , CO, C 2 h 6 Such as alkane gas, the gas is discharged from the inside of the bare cell through the laminated structure, which will cause difficulty in exhausting

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