Laminate Secondary Battery Protective Member Position Constraint
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Solution Overview
Problem
Laminate secondary batteries with protective members to regulate deformation face reduced performance due to protective member movement towards the electrode body during decompression, leading to breakage and decreased production efficiency.
Innovation Solution
Incorporating a movement regulating means, such as engaging parts or holding members, to prevent the protective member from moving towards the electrode body, and using a rib part to secure the electrode terminal, thereby preventing breakage and maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective member is provided in the inside of the exterior body to regulate deformation, then the welded part is protected from cleavage, but the protective member may move towards the electrode body during decompression treatment causing breakage
Solution Approach 1:
The patent introduces a movement regulating means as an intermediary component between the protective member and the electrode body. This intermediary structure prevents direct harmful contact by controlling the protective member's movement, allowing it to fulfill its protective function without causing breakage to the electrode body.
Solution Approach 2:
The movement regulating means is designed to preliminarily constrain the protective member's movement before decompression treatment occurs. By pre-establishing positional limits through engagement structures (protrusions fitting into grooves, or holding members), the system prevents the harmful movement that would otherwise occur during subsequent decompression.
2Stability of the object's composition
If a protective member is provided to regulate shrinkage deformation, then the exterior body deformation is controlled, but the protective member moves to the center during decompression treatment
Solution Approach 1:
The movement regulating means acts as an intermediary constraint that allows the protective member to perform its function of regulating exterior body shrinkage while simultaneously maintaining precise positioning. The engagement structures (protrusions and grooves, or holding members) serve as mediators that prevent deviation from the intended position during decompression treatment.
3Adaptability or versatility
If the protective member is allowed to move freely to regulate deformation, then the deformation regulation function is achieved, but the electrode terminal may come into contact with the protective member causing breakage
Solution Approach 1:
The movement regulating means serves as a protective intermediary between the protective member and the electrode terminal. It allows the protective member to move sufficiently to regulate deformation while preventing excessive movement that would cause harmful contact with the electrode terminal, thus maintaining both adaptability and reliability.
Data Source
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AI summary
According to the present disclosure, technology of preventing reduction of battery performances in manufacturing steps is provided for a secondary battery provided with a protective member for preventing cleavage of a welded part. A secondary battery disclosed herein includes an electrode body including a terminal connecting part, an exterior body including a welded part at an outer circumferential edge part, and an electrode terminal connected with the terminal connecting part. The secondary battery includes a protective member that is placed between the exterior body and the electrode body, and regulates shrinkage deformation of the exterior body toward a center in a width direction. The second battery further includes a movement regulating means for regulating movement of the protective member. The movement regulating means is, for example, an engaging part for engaging the protective member and the electrode terminal with each other. The movement regulating means regulates movement of the protective member toward the center in the width direction, thereby preventing breakage of the electrode body due to contact with the protective member. This can prevent reduction of battery performances in manufacturing steps.