Lithium Battery Module Pressing Structure for Wound Body Isolation
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Solution Overview
Problem
Lithium batteries experience expansion due to gas generation during charging and discharging, leading to potential short circuits between the positive and negative electrodes as the exterior body expands, as existing solutions fail to effectively fix the wound body components in place.
Innovation Solution
A lithium battery module design featuring a wound body with a non-stretchable member integrated into the exterior body, which transfers pressing force from a protective case to the wound body through projecting portions, preventing sliding and maintaining electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exterior body is made expandable to accommodate gas generation during charging/discharging, then the battery can handle volume changes, but the wound body components can slide and cause short circuits
Solution Approach 1:
The exterior body is segmented into a first member (base portion) and a second member (partial region with lower stretchability). This segmentation allows different regions to have different functions: the first member accommodates expansion while the second member maintains structural integrity to prevent wound body sliding and electrical short circuits.
Solution Approach 2:
The second member is provided in a specific partial region of the exterior body where lower stretchability is needed to prevent sliding. This local quality approach ensures that only the necessary region has restricted expansion properties, while other regions can still accommodate gas generation.
2Reliability
If a pressing member is added to fix the wound body, then electrical isolation is maintained, but device complexity increases
Solution Approach 1:
The pressing member is integrated with the second member of the exterior body, combining the functions of structural support and pressing force application into a single component. This merging reduces the number of separate parts while maintaining the ability to prevent wound body sliding.
Solution Approach 2:
The second member serves multiple functions: it provides structural support, applies pressing force to the wound body, and maintains electrical isolation. This multi-functionality reduces the need for additional dedicated components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively fixes the wound body during expansion, reducing the risk of short circuits and ensuring stable battery operation by distributing the pressing force across a wider area, thus preventing electrode contact.
Implementation Method 1
the pressing member transfers pressing force from the protective case to the wound body through the second member to fix the wound body by pressing force from the exterior body
Implementation Method 2
the exterior body has a characteristic of expanding due to gas generated by repeated charging/discharging
Data Source
AI summary
A lithium battery module includes: a wound body formed by winding a positive electrode and a negative electrode with a separator interposed between the positive electrode and the negative electrode; an exterior body enclosing the wound body; a protective case housing the exterior body; and a pressing member provided between the exterior body and the protective case, in which the exterior body includes: a first member serving as a base; and a second member provided in a partial region of the exterior body, the second member has lower stretchability than the first member, and the pressing member transfers pressing force from the protective case to the wound body through the second member to fix the wound body by pressing force from the exterior body.