Stacked Battery Separator Structure for Impact and Vibration Protection
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Solution Overview
Problem
The increase in size of secondary batteries for battery electric vehicles leads to increased weight of the electrode body, necessitating improved protection against impact and vibration to enhance reliability.
Innovation Solution
A secondary battery design featuring a stacked-type electrode body with a zigzag-bent separator disposed between electrode plates, a wound part covering the outer periphery, and an extension part acting as a cushion to protect against impact and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of secondary battery is enlarged to extend cruising distance, then the energy storage capacity is improved, but the weight of electrode body increases leading to higher susceptibility to impact and vibration damage
Solution Approach 1:
The separator is designed with a specific structural configuration including a first bent part, second bent part, and extension part that protrudes toward the electrode plate. This configuration creates a cushioning effect that absorbs and mitigates the impact and vibration forces before they can damage the electrode plates, thereby protecting the battery structure during manufacturing and operation
Solution Approach 2:
The separator acts as a flexible protective film with a specialized geometric structure. The bent parts and extension parts create a flexible configuration that can deform to absorb impact forces while maintaining the protective barrier function, preventing direct transmission of mechanical stresses to the electrode plates
2Quantity of substance
If the weight of electrode body is increased to provide higher energy density, then the energy storage is improved, but the damage from impact and vibration during manufacture increases
Solution Approach 1:
The separator configuration with bent parts and extension parts creates a cushioning structure that is built into the battery assembly before it undergoes manufacturing processes. This pre-configured cushioning system mitigates impact and vibration forces during manufacturing, protecting the heavy electrode body from damage that would otherwise occur during handling and assembly
3Ease of manufacture
If a simple separator configuration is used, then the manufacturing complexity is reduced, but the protection against impact and vibration is insufficient
Solution Approach 1:
The separator is designed with localized structural features including a first bent part, second bent part, and extension part that protrudes toward the electrode plate. These local structural modifications create targeted cushioning zones at critical areas where impact and vibration forces are most likely to affect the electrode plates, providing enhanced protection without requiring complete redesign of the entire separator
Data Source
AI summary
A secondary battery includes: a stacked-type electrode body including first electrode plates, second electrode plates, and a separator. The separator includes a zigzag-bent part bent in a zigzag manner, and a wound part wound to an outer periphery of a part where the first and second electrode plates and the zigzag-bent part are stacked. The separator includes a start end part and a terminal end part that is positioned at a winding terminal end of the wound part. The zigzag-bent part includes a first bent part and a second bent part. The separator includes an extension part positioned on a side of the start end part relative to the zigzag-bent part, and disposed between the second bent part and the wound part. In the stacking direction of the first and second electrode plates, outer surfaces of both electrode plates positioned at the outermost surface sides are covered with the separator.