Energy storage device

Abstract

The embodiment of the invention discloses an energy storage device. The energy storage device comprises a shell and an energy conversion element. The shell comprises a first half shell and a second half shell; each of the first half shell and the second half shell comprises a concave structure and an edge part; the edge part is arranged around an opening part of the concave structure; the edge part is connected with the opening part; a cavity is defined by the concave structure of the first half shell and the concave structure of the second half shell; and the energy conversion element is arranged in the cavity, the edge part of the first half shell and the edge part of the second half shell are connected in a sealed mode to form a sealed edge, one part of the sealed edge is bent towards afirst side of the shell, and the other part of the sealed edge is bent towards a second side of the shell in the direction opposite to the first side.

Description

technical field [0001] The present invention relates to the technical field of energy conversion, and more specifically, relates to an energy storage device. Background technique [0002] An energy storage device, such as a pouch battery, usually includes a winding core and two half-shells snapped together. The winding core is assembled into a space enclosed by the two half-shells. The two tabs of the winding core protrude outward from the edges of the two half-shells. There is insulation between the two half shells. For example, the half shell is an aluminum plastic film. The tabs are also insulated from the two half-shells. The edges of the two half-shells are joined together by thermocompression. The plastic layer on the surface of the aluminum-plastic film is a thermoplastic material. When heated to the set temperature, the plastic layer on the aluminum-plastic film becomes sticky. Under the action of external pressure, the two edges are bonded together, and the tabs...

AI Technical Summary

Problems solved by technology

In traditional pouch batteries, the sealing edge of the packaging film is bent to one side, but in this solution, since the edge is ring-shaped, if it is bent to one side, the shell will usually wrinkle to form an elastic deformation structure, so The bent part is easy to rebound in size and affects the size consistency and assembly use. Wrinkles will also occupy a large space, thereby limiting the energy space utilization of the battery, and the energy density of the battery is low.

In addition, if the shell is changed to a harder and thicker packaging material such as stainless steel foil, its strength is too high to form wrinkles well, and the structure may be damaged during the formation of wrinkles, which will damage the sealing performance

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