Soft package battery

Abstract

The present invention provides a soft package battery, which comprises two layers of packaging films and a battery core packaged between the two packaging film layers, wherein each packaging film layer comprises an outer protection layer, an inner fusion layer and a metal layer positioned between the outer protection layer and the inner fusion layer, the two packaging film layers form a main bodypart for accommodating the battery core at the middle portions, and are sealed and connected around the main body part to form a top sealing part and side sealing parts, the side sealing parts are folded and adhered to the side surfaces of the main body part, each packaging film is divided into a body and a free end on the side sealing part, the free end is folded back to the corresponding body, the metal layer is exposed to the end surfaces of each free end, and the free ends of the two packaging film layers are integrally fixed and are clamped between the bodies of the two packaging films. According to the present invention, the insulating sealing of the metal layer exposed to the end surface can be achieved by using the folding structure of each packaging film on the side sealing partswithout other edge sealing materials so as to simplify the edge sealing process of the battery and improve the edge sealing effect.

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 problem of exposed aluminum in conventional batteries, but they also have their own limitations, especially when the edge-sealing treatment of non-rectangular batteries is performed on non-linear edges. On the one hand, For non-straight edges, the insulating tape cannot completely cover the edge of the packaging edge, and there is a risk of aluminum exposure. For curved edges such as rounded corners, there are problems such as tape wrinkling and overlapping, causing appearance defects, and after a certain period of use, The tape may be warped or turned at the beginning and end, causing appearance defects and the risk of aluminum exposure; The folded edge structure, the double folded edge process is cumbersome, and the width of the battery is increased at the same time, which easily leads to the size exceeding the specification

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