Soft pack battery

Abstract

The invention provides a soft pack battery, which comprises two layers of packaging films and an electric core packaged between the two layers of packaging films. Each layer of packaging film includes an outer protection layer, an inner fusion layer and a metal layer between the outer protection layer and the inner fusion layer. The two-layer packaging film forms a main body for storing batteries in the middle, and is sealed and connected around the main body to form a top seal and a side seal, wherein the side seal is bent and attached to the side of the main body. The height of the side sealing part along the thickness direction is smaller than the height of the side, and the side sealing part is provided with a gap at the upper edge along the thickness direction; the pouch battery also includes: insulating glue, covering the side sealing part to expose the metal layer end face, and bonded to the side of the main body. The insulating glue in the pouch battery of the present invention can not only ensure the edge sealing effect, but also ensure that the side sealing part is firmly attached to the side of the main body, and does not occupy the dimensional space of the pouch battery, thereby simplifying the edge sealing process , to increase the energy density of the pouch battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a soft pack battery. Background technique [0002] Soft-pack lithium-ion batteries currently mainly use aluminum-plastic composite film for cell packaging. The aluminum-plastic film is mainly divided into a three-layer structure of a protective layer, a metal layer and a fusion layer. After packaging and edge trimming during packaging, the metal layer at the edge of the package cannot be wrapped and exposed, which may easily lead to problems such as short circuits. [0003] At present, the edge sealing structure of the battery mainly includes two kinds of structure, the single folding edge structure and the double folding edge structure. The single folded edge structure of the rubber wrapping is to paste the insulating tape on the edge of the battery package, and then use the mechanical method to fold up the package edge and paste it on the side of the main body of the cell; the double ...

AI Technical Summary

Problems solved by technology

[0004] Both edge-sealing structures can solve the aluminum exposure problem of conventional batteries, but both will increase the overall size of the battery cell and reduce the energy density of the battery cell

For example, after the insulating tape is pasted on the edge of the packaging side in the single-folding structure of the rubber wrapping, another insulating tape is needed to paste the folded packaging side on the main body of the battery cell. The two insulating tapes will take up a large space, and at the same time Pasting the insulating tape twice will also reduce production efficiency; the package side of the double-fold structure is folded into two layers, which will also increase the space occupied by the package side, which will easily cause the size of the battery to exceed the specification

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