Electric energy storage device and its manufacturing method

Abstract

An electric energy storage device which has a connection structure having a high connection reliability and can avoid contact between an outer-packaging body and a connection terminal by a simple structure. The electric energy storage device comprises a battery element (10) stored in an outer-packaging body (20) including a metal layer (21b), a plate-like internal lead (31) connected to the battery element (10), a plate-like external lead (32), a connection terminal (33) for electrically connecting the internal lead (31) and the external lead (32), an inside insulation member (41), and an outside insulation member (43). The electric energy storage device is characterized in that flanges (33T, 33B) on both sides of the connection terminal (33) hold the outside insulation member (43), the outer-packaging body (20), and the inside insulation member (41) in between while pressing them via the plate-like external lead (32) and internal lead (31) and that the outside insulation member (43) and / or the inside insulation member (41) is press-fit between a through shaft (33S) of the connection terminal (33) and the metal layer (21b) of the outer-packaging body (20).

Description

technical field [0001] The invention relates to electric storage equipment such as lithium ion accumulators, lithium accumulators, polymer accumulators, and electric double-layer capacitors. Background technique [0002] Conventionally, with regard to electric storage devices such as lithium-ion storage batteries, demands for miniaturization, weight reduction, and degree of freedom in shape have been increasing along with the expansion of various applications. [0003] Therefore, based on this requirement, a lightweight, thin, and flexible sheet-shaped lithium-ion battery is proposed. As the battery case, a flexible outer package is formed by a laminated film with a multi-layer structure, and the sheet-shaped internal electrodes are connected to each other. and the electrolyte are enclosed in the outer packaging body, and the laminated film of the multilayer structure has an inner surface layer made of a thermoplastic resin such as polyethylene, polypropylene, etc., which is...

AI Technical Summary

Problems solved by technology

[0009] For example, in the storage battery disclosed in Patent Document 1, the through hole of the exterior body 2 and the rivet shaft diameter of the rivet 7a are formed to be approximately equal. Insulation breakage occurs between the rivet shafts of the rivet 7a, and as a result, an internal short circuit occurs between the aluminum foil intermediate layer 2b and the rivet shaft of the rivet 7a

[0010] In addition, in the storage battery disclosed in Patent Document 2, since the metal protruding portion 41 is sealed with a separate nut or resin, there is a problem in long-term sealing reliability.

In addition, it is necessary to provide a separate sealing part 5 (insulating member) for each protruding part 41, which may cause problems in terms of cost increase and operability due to the increase in the number of parts and work processes.

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