Battery, particularly a button cell, and method for manufacture of such a battery

Abstract

The present invention relates to a method for manufacturing a battery comprising a casing provided with a cup and a closure part for said cup, the method comprising the successive steps consisting in:providing at least three parts with a first part defining one pole, and a second part and a third part defining the other pole and intended to form together the cup, the first and second parts respectively comprising a first surface and a second surface (6a) of matching shape, at least one adhesive portion of each of said surfaces extending in a geometric surface non-parallel to the general axis of the battery;bonding the aforementioned first and second surfaces to provide a structure with an adhesive joint between the first and second parts;welding the third part to the second part; the adhesive joint being arranged against an inner face of the cup, the aforementioned adhesive portion of the second part forming a stop, along the general axis, for the first part, which is located inside the cup.

Description

[0001]This application claims priority from European Patent Application No. 17157252.2 filed on Feb. 21, 2017, the entire disclosure of which is hereby incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a method for manufacturing batteries and, in particular, button cells. It also relates to the battery obtained by the aforementioned manufacturing method.BACKGROUND OF THE INVENTION[0003]Button cell batteries generally include a casing provided with a cup and a lid respectively forming the positive and negative poles of the battery. Conventionally, button cell batteries are sealed with a preformed elastomer seal which is positioned between the cup and the lid. This elastomer seal provides galvanic isolation between the poles and forms a barrier between the electrolyte contained inside the battery and the external environment. Such an assembly is disclosed, for example, in GB Patent No. 1566061.[0004]This assembly with a preformed crimped sea...

AI Technical Summary

Benefits of technology

The present invention proposes a new method for manufacturing batteries to improve their properties. The method involves assembling the battery parts in two phases. In the first phase, the parts are bonded together with an adhesive joint that electrically isolates them, avoiding contamination. The adhesive joint is designed to withstand internal overpressure by mainly compressing it instead of traction or shearing. This design allows for improved adhesion at higher pressures. The method allows for the use of an adhesive that is resistant to mechanical and chemical challenges, and ensures a clean environment during bonding. The technical effect of the invention is to improve the bonding quality and performance of batteries.

Problems solved by technology

This assembly with a preformed crimped seal has the drawback of occupying a significant amount of space which will restrict the active volume of the battery.

To reduce the space allocated to the sealing junction, an adhesive joint instead of the preformed elastomer seal is a promising solution, but which raises some technical issues.

Thus, it is recommended not to go beyond 70° C., which limits the opportunity to choose the most suitable adhesive for ensuring the best mechanical and chemical resistance of the assembly.

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