Electrode Assembly Joint Groove Layout for Thinner Batteries
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Solution Overview
Problem
The existing production process of lithium-ion batteries results 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, which is necessary to reduce the overall thickness of the battery.
Innovation Solution
An electrode assembly is designed with a first electrode piece having a tab mounting groove and a reserved area, where the tab forms a joint with the reserved area, and a second electrode piece with a groove opposite to the joint, allowing the joint to be embedded in the groove when pressed together, thereby reducing the battery's overall thickness without 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 overall thickness of the battery is reduced, but burrs increase and the risk of electrode piece breakage increases
Solution Approach 1:
The invention extracts the active material layer from the edge region where punching would occur by designing a reserved area that extends to the edge. This allows the tab mounting groove to be positioned such that the active material layer does not need to be punched at the edge, thereby avoiding burr formation and breakage risks while still enabling thickness reduction through alternative structural design.
Solution Approach 2:
The reserved area of the active material layer is pre-designed to extend to the edge of the electrode piece before assembly. This preliminary configuration allows the tab to be mounted in a way that covers part of the reserved area, forming a joint structure that eliminates the need for subsequent punching operations and prevents edge damage.
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 overall thickness of the battery is reduced, but the risk of electrode piece breakage increases
Solution Approach 1:
The invention removes the need for punching operations by extracting the active material layer configuration to include a reserved area that extends to the edge. This design choice eliminates the harmful punching process entirely, thereby preventing both burr formation and the risk of electrode piece breakage while achieving thickness reduction through the tab-reserved area joint structure.
Solution Approach 2:
The reserved area is pre-configured to extend to the edge of the electrode piece, allowing the tab to be mounted in advance in a position that covers part of the reserved area. This preliminary action forms a joint structure that eliminates the need for subsequent punching operations, thereby preventing electrode piece breakage and maintaining structural integrity.
3Manufacturing precision
If a reserved area is provided between the tab mounting groove and the edge of the active material layer, then punching is avoided and edge quality is improved, but the battery thickness may increase
Solution Approach 1:
The reserved area is pre-designed to extend to the edge of the electrode piece, and the tab is mounted in advance to cover part of this reserved area, forming a joint structure. This preliminary configuration allows the battery to achieve reduced thickness without requiring punching operations, as the tab-reserved area joint naturally accommodates the edge region and eliminates the need for additional thickness-consuming punching processes.
Data Source
AI summary
Provided are an electrode assembly, a battery and a manufacture method thereof. The electrode assembly includes a separator, first and second electrode pieces 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 and provided with a first tab mounting groove, 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, the first tab covers 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 provided with a groove opposite to the joint.