Battery Current Collector Bending Guide to Prevent Crease Offset
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Solution Overview
Problem
The current collecting structure in batteries is prone to crease offset during bending, leading to installation difficulties and potential damage, which compromises battery performance.
Innovation Solution
A current collecting structure with a guide member featuring a weakened portion guides the bending process to ensure the bending axis aligns with the weakened area, reducing offset and tilt, and is made of materials like polypropylene or polyethylene terephthalate for insulation and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bending treatment is performed on the current collecting structure to connect tabs and electrode terminals, then the current collecting structure can be installed into the battery shell, but crease offset occurs during the bending process resulting in installation difficulty and potential damage
Solution Approach 1:
The guide member is designed with a weakened portion that has different mechanical properties (lower bending resistance) compared to other portions. This local quality difference allows the guide member to selectively bend at the weakened portion, guiding the current collecting structure to bend at the correct position and reducing crease offset.
Solution Approach 2:
The guide member acts as an intermediary component between the current collecting structure and the bending process. By introducing this intermediate element with a specifically designed weakened portion, the bending process is controlled and guided, preventing direct uncontrolled bending of the current collecting structure and reducing crease offset.
2Strength
If the current collecting structure is made with sufficient thickness and hardness to maintain structural integrity, then strength is improved, but bending treatment becomes difficult and crease offset increases
Solution Approach 1:
The guide member exhibits local quality differentiation through its weakened portion, which has reduced bending resistance compared to other areas. This allows the guide member to be sufficiently strong overall while locally accommodating easy bending at the weakened portion to guide the current collecting structure.
Solution Approach 2:
The guide member serves as a mediator that absorbs the bending action. Instead of directly bending the strong current collecting structure (which causes crease offset), the guide member bends at its weakened portion, allowing the current collecting structure to be installed without requiring excessive bending ease.
3Ease of operation
If forced installation is used to install the current collecting structure into the battery shell despite crease offset, then installation is achieved, but damage occurs to the current collecting structure, tabs, and electrode terminals
Solution Approach 1:
The guide member is pre-designed with a weakened portion that will bend during the installation process. This preliminary structural design ensures that the guiding function is built into the component before installation, allowing the current collecting structure to follow the correct bending path and be installed smoothly without forced installation that could cause damage.
Solution Approach 2:
The guide member acts as a protective intermediary during installation. By controlling the bending process through its weakened portion, it prevents misalignment and crease offset that would otherwise require forced installation, thereby protecting the current collecting structure, tabs, and electrode terminals from damage and maintaining component integrity.
Data Source
AI summary
A current collecting structure includes: a current collecting member, where the current collecting member includes a first connection end, a second connection end, and a bending portion, and the bending portion connects the first connection end and the second connection end; and a guide member, where the guide member is provided with a weakened portion, the bending resistance strength of the weakened portion is less than the bending resistance strength of other portions of the guide member except the weakened portion; the guide member cooperates with the current collecting member, the weakened portion corresponds in position to the bending portion, and the guide member is configured to guide the bending portion to bend at a position of the weakened portion.