Battery Cell Electrode Layout for Burr-Induced Short Prevention
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Solution Overview
Problem
Existing battery technologies face challenges in improving safety due to the risk of short circuits caused by burrs on the edges of positive electrode plates piercing the separator during the cutting process.
Innovation Solution
A battery cell design that includes a first insulation layer on the negative current collector, with the projection of the positive electrode plate's edge falling into the insulation layer, enhancing insulation between the negative and positive electrode plates and reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the positive electrode plate is cut to form a tab, then the battery structure is completed, but burrs are generated on the edge that can pierce the separator and cause short circuits
Solution Approach 1:
An insulation layer is introduced as an intermediary component between the positive electrode plate edge and the negative electrode plate. This insulation layer acts as a mediator that prevents direct contact and potential short circuits caused by burrs, while not interfering with the normal battery assembly process or manufacturing ease.
2Quantity of substance
If the active material layer area is increased to improve energy density, then the battery capacity increases, but the risk of edge burrs causing short circuits increases
Solution Approach 1:
The positive electrode plate is segmented into two distinct regions: an active material layer region for energy storage and an insulation layer region at the edge for safety. This segmentation allows the active material layer to extend to the edge to maximize energy density, while the separate insulation layer provides protective coverage against burr-induced short circuits.
3Reliability
If the insulation layer is added to prevent short circuits, then safety is improved, but the device complexity increases
Solution Approach 1:
The insulation layer is merged with the positive electrode plate structure, forming an integrated component where the insulation layer serves as part of the electrode plate assembly. This merging approach simplifies the overall device structure by eliminating the need for separate insulation components and reducing assembly steps.
Data Source
AI summary
A battery cell includes an electrode assembly. The electrode assembly includes: a negative electrode plate, including a negative current collector and a negative active material layer; and a positive electrode plate, including a positive current collector and a positive active material layer. A positive tab extends out from a first edge of the positive electrode body. The positive active material layer is disposed on a surface of the positive electrode body. Along a thickness direction of the negative electrode body, a projection of the positive active material layer on the negative electrode plate falls in the negative active material layer. The negative electrode plate further includes a first insulation layer. Along the thickness direction of the negative electrode body, a projection of the first edge on the negative electrode plate falls in the first insulation layer.