Lithium battery and manufacturing method thereof

Abstract

The invention discloses a lithium battery and a manufacturing method thereof. The lithium battery comprises a shell, a battery cell and a sealing plate assembly. The shell comprises a substrate and asurrounding wall. An accommodating cavity for accommodating the battery cell is formed between the surrounding wall and the substrate. An opening communicated with the accommodating cavity is formed in the end, away from the substrate, of the surrounding wall. The sealing plate assembly seals the opening. The sealing plate assembly comprises a body, and a first connecting piece and a second connecting piece are arranged on the body at intervals. An expansion space is formed between the first connecting piece and the second connecting piece and located on the side, close to the accommodating cavity, of the body. One of the first connecting piece and the second connecting piece is in insulation connection with the body. The first connecting piece is provided with a first connecting part extending to the position between the battery cell and the surrounding wall, and one tab of the battery cell is connected with the first connecting part. The second connecting piece is provided with a second connecting part extending to the position between the battery cell and the surrounding wall, and the other tab of the battery cell is connected with the second connecting part. The lithium batteryis simple in structure, high in sealing reliability and low in processing difficulty, and the bulging phenomenon of the lithium battery can be relieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium battery and a manufacturing method thereof. Background technique [0002] At present, a lithium battery with a hard case structure usually includes a casing and a battery cell. The casing includes a bottom case and a cover plate. The upper end of the bottom case is open, and the cover plate seals the opening. The inner side of the bottom of the shell is welded, and the positive lug is connected with the cover plate. This type of lithium battery has the following defects: 1. The lithium battery has many parts, complex structure, high difficulty in processing and production, is not suitable for mass production and assembly, and has low production efficiency; Then carry out the tab welding. Since the welding is carried out inside the shell, laser welding can only be used for welding, and laser welding needs to be tightly pressed, so the welding defect rate is high and t...

AI Technical Summary

Problems solved by technology

This type of lithium battery has the following defects: 1. The lithium battery has many parts, complex structure, high difficulty in processing and production, is not suitable for mass production and assembly, and has low production efficiency; Then carry out the tab welding. Since the welding is carried out inside the shell, laser welding can only be used for welding, and laser welding needs to be tightly pressed, so the welding defect rate is high and the operation is complicated; 3. The battery needs to be adjusted during welding. Do special protection to prevent the influence of heat diffusion on the battery core, and the cover plate is prone to bulging during subsequent charging and discharging after welding

Images