Electrode Assembly Tab Groove Layout for Thinner Batteries
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Solution Overview
Problem
Conventional lithium-ion battery production processes result in increased burrs and the risk of breakage due to the need to punch the active material layer at the edge of the tab mounting groove to reduce battery thickness.
Innovation Solution
An electrode assembly design where the first electrode piece has a tab mounting groove with a reserved area forming a joint, and the second electrode piece has a groove opposite to this joint, allowing the joint to be embedded when pressed together, eliminating the need for punching the active material layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the active material layer is punched at the edge of the tab mounting groove to reduce battery thickness, then the battery thickness is reduced, but burrs increase and the risk of electrode piece breakage increases
Solution Approach 1:
A reserved area is pre-formed at the edge of the active material layer adjacent to the tab mounting groove during the electrode piece manufacturing process. This reserved area serves as a sacrificial region that absorbs the punching operation, preventing damage to the main active material layer and reducing burr formation on critical edges.
Solution Approach 2:
The reserved area acts as an intermediary sacrificial zone between the tab mounting groove and the edge of the active material layer. By positioning this reserved area to be punched first, it mediates the mechanical stress and prevents direct damage to the functional active material layer, thereby reducing burrs and breakage risk.
2Length of stationary object
If the active material layer is punched at the edge of the tab mounting groove to reduce battery thickness, then the battery thickness is reduced, but the risk of electrode piece breakage increases
Solution Approach 1:
The reserved area is pre-formed during electrode manufacturing as a sacrificial zone. When punching occurs, this reserved area is removed first, preventing stress concentration and crack propagation that would otherwise lead to electrode piece breakage, thereby maintaining structural integrity and reliability.
Solution Approach 2:
The reserved area serves as a cushioning zone that absorbs mechanical stress and energy from the punching operation. By having this sacrificial region in place beforehand, the electrode piece is protected from sudden stress concentration that could cause breakage, enhancing overall reliability.
3Ease of manufacture
If a conventional tab mounting groove design is used without a reserved area, then the manufacturing process is simpler, but punching is required which increases burrs and breakage risk
Solution Approach 1:
The reserved area is formed during the standard electrode manufacturing process using existing equipment and procedures. This preliminary formation of the reserved area does not require additional complex manufacturing steps but simply modifies the punching pattern, maintaining ease of manufacture while improving edge quality.
Data Source
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AI summary
The present application provides an electrode assembly, a battery and a manufacture method thereof, relating to the technical field of batteries, and for solving problems that the edge of an existing electrode piece has burrs and the risk of breakage of electrode piece during winding. The electrode assembly includes a separator, and a first electrode piece and a second electrode piece oppositely disposed on both sides of the separator; the first electrode piece includes a first tab and a first active material layer located on a surface of a side of the first electrode piece, the first active material layer is provided with a first tab mounting groove, and a reserved area is provided between one side of the first tab mounting groove and an edge of the first active material layer along a first direction; a portion of the first tab is connected within the first tab mounting groove, and the first tab covers a portion of the reserved area to form a joint; the second electrode piece includes a second active material layer located on a surface of a side of the second electrode piece, and the second active material layer is provided with a groove opposite to the joint. The electrode assembly provided by the present application is used for manufacturing a battery, and can reduce the overall thickness of the battery.