Packaging case and pouch battery

Abstract

The invention provides a packaging case and a soft pack battery. The packaging shell includes a first packaging film and a second packaging film, and each of the first packaging film and the second packaging film includes an outer protective layer, an inner fusion layer, and a metal layer between the outer protection layer and the inner fusion layer. The first packaging film is formed with a cavity. The soft pack battery includes: the packaging case, and the inner fusion layer of the second packaging film is connected with the inner fusion layer of the first packaging film around the concave cavity; and the electric core is accommodated in the concave cavity of the first packaging film Inside. The part where the second packaging film is connected with the first packaging film forms a side sealing edge and a top sealing edge, and the side sealing edge is bent and adhered to the outer wall of the concave cavity. At least one edge of the outer protective layer of the second packaging film exceeds the metal layer of the second packaging film, and at least one of the edges beyond the metal layer of the second packaging film is located on the side edge, and on the side edge, the second The portion of the outer protective layer of the second packaging film that extends beyond the metal layer of the second packaging film is folded back and secured to the outer protective layer of the first packaging film.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a packaging case and 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 ...

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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