Method for producing a cup and an energy storage element, and energy storage element which can be produced in this manner

By reducing the transition at the inner edge of the housing cup through post-processing, the method enhances stability and maximizes internal volume, optimizing energy density in electrochemical energy storage elements.

WO2025248046A1PCT designated stage Publication Date: 2025-12-04VARTA MICROBATTERY GMBH
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Patent Information

Application Number
PCT/EP2025/064916
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-05-29
Filing Date
2025-05-28
Publication Date
2025-12-04

AI Technical Summary

Technical Problem

Conventional electrochemical energy storage element housings have a transition at the inner edge that limits the internal volume and stability, making it difficult to optimize energy density and stability simultaneously.

Method used

A method involving sheet metal forming followed by post-processing, such as impact compaction, to reduce the transition at the inner edge of the housing cup, enhancing the stability and maximizing the internal volume.

Benefits of technology

The method increases the internal volume and stability of the housing, allowing for larger electrode-separator assemblies and improving the energy density of the energy storage element.

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    Figure EP2025064916_04122025_PF_FP_ABST
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Abstract

In a method for producing a cup (100) for a housing of an electrochemical energy storage element (10), the cup (100) is first shaped by means of a sheet-metal shaping process, wherein the cup comprises a cup base (102) and a circumferential side wall (101). The cup base (102) and the side wall (101) delimit an inner edge (200) which is formed during the sheet-metal shaping process and is characterised by a transition (213). Furthermore, the cup (100) is machined in the region of the inner edge (200), wherein the transition (213) at the inner edge is reduced. The machining is carried out by means of a targeted, pulse-like action of force of a striking tool. A cup (100) produced in this manner has an annular shoulder step (125) in which the wall thickness of the side wall (101) decreases in the axial direction. The invention also relates to an energy storage element (10) comprising the cup (100) and to a method for producing the energy storage element (10).
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Citation Information

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