Battery Separator Local Fusion for Impact and Heat Resistance
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Solution Overview
Problem
Existing battery designs, such as wound and laminated batteries, are inadequate in terms of impact resistance and heat resistance, making them vulnerable to external loads like falling and heat exposure.
Innovation Solution
A battery design featuring a laminated structure with a separator interposed between positive and negative electrodes, a fixing member on the exposed end face, and a tab with the separator protruding from one end face, where the separator is fused with the protruding portion but not with the tab, enhancing impact and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the separator is fused with the end face to fix the battery element, then the fixing strength is improved, but the heat resistance deteriorates due to thermal runaway risk
Solution Approach 1:
The separator is fused with the end face at specific locations (protruding portions) but deliberately not fused at other locations (around the tab). This localized fusion approach provides fixing strength where needed while maintaining heat resistance and gas release pathways where critical for safety.
Solution Approach 2:
The fusion of the separator with the end face is segmented into specific regions rather than being continuous. The protruding portions are fused while the tab area remains unfused, creating distinct functional zones that simultaneously achieve fixing and thermal safety.
2Stability of the object's composition
If the separator is completely fused with the end face, then the structural integrity is improved, but the ability to release gas during thermal events deteriorates
Solution Approach 1:
The separator fusion is applied locally to protruding portions while leaving the tab area unfused. This creates specific unfused regions that serve as gas release pathways during thermal events, preventing gas accumulation while maintaining overall structural integrity through the fused portions.
3Strength
If the battery element is tightly fixed to resist external load, then the impact resistance is improved, but the heat dissipation capability deteriorates
Solution Approach 1:
The separator provides localized fixing at protruding portions to resist external loads and improve impact resistance, while the unfused tab area maintains open pathways for heat dissipation and gas release, preventing heat accumulation during thermal events.
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 suppresses thermal runaway and damage from external loads, achieving high impact and heat resistance by allowing gas release and maintaining structural integrity.
Implementation Method 1
the separator is mutually fused with at least a protruding portion of one of the one end face or another end face opposite to the one end face
Data Source
AI summary
Provided is a battery having both high impact resistance and high heat resistance.Provided is a battery including: a battery element in which a positive electrode and a negative electrode are laminated with a separator interposed therebetween; a fixing member disposed on an end face where a laminated surface of the battery element is exposed; and a tab led out from one end face of the battery element, wherein the separator protrudes from the end face of the battery element, the separator is mutually fused with at least a protruding portion of one of the one end face or another end face opposite to the one end face; and the separator positioned around the tab on the one end face is not mutually fused with the one end face.