Secondary Battery Sealing Plate Layout for Compact Tab Connection
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Solution Overview
Problem
The existing configuration of secondary batteries results in a large occupied width and volume for the current collector portion, limiting the ability to increase energy density due to the arrangement of non-applied-portion-contacted and flange portions, as well as the potential for increased width when an electrode tab group is included.
Innovation Solution
The design incorporates a secondary battery with a first and second electrode tab group, each bent to direct their tip sides towards opposite ends of the sealing plates, and a current collector member with stepped regions to optimize space, allowing for a more compact configuration that enhances energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the non-applied-portion-contacted portion and the flange portion are arranged side by side in the winding axis direction, then the current collector portion can connect the electrode group and the electrode terminal, but the occupied width in the winding axis direction becomes large, reducing the volume available for the electrode assembly
Solution Approach 1:
The current collector portion is configured to extend in the radial direction of the electrode group rather than along the winding axis direction. This dimensional change allows the connection structure to occupy radial space instead of axial space, thereby reducing the occupied width in the winding axis direction and increasing the volume available for the electrode assembly while maintaining the connection function between the electrode group and electrode terminal.
2Ease of manufacture
If an electrode tab group is provided at an end portion of the electrode assembly, then the electrode assembly can be connected to the current collector, but the occupied width of the current collector portion increases, reducing energy density
Solution Approach 1:
The electrode tab group is integrated with the current collector portion such that the current collector portion directly contacts the electrode tabs. This merging eliminates the need for separate connection components and reduces the overall occupied width in the winding axis direction, thereby increasing the volume available for active materials and improving energy density while maintaining the electrical connection function.
Data Source
AI summary
A first sealing plate has a first end portion and a second end portion located opposite to each other in a second direction orthogonal to the first direction. A negative electrode tab group is bent at a first bent portion such that a tip side of the negative electrode tab group with respect to the first bent portion is directed to the second end portion side. The first sealing plate is provided with a first through hole in which the negative electrode terminal is inserted in the first direction. The first bent portion is located on the first end portion side with respect to a center of the first sealing plate in the second direction. A center of the first through hole is located on the second end portion side with respect to the center of the first sealing plate in the second direction.