Silicon-Coated Negative Electrode Edge for Separator Protection
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Solution Overview
Problem
Existing secondary batteries face reliability issues due to potential contact between the negative electrode core body and the separator, leading to damage and short circuits.
Innovation Solution
A secondary battery electrode plate with a metal core body and active material layers on both sides, featuring a tab protrusion and a silicon-containing coating on the end surface of the core body to prevent direct contact with the separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative electrode core body is provided without additional protective measures, then the device complexity is reduced, but the separator may come into contact with the core body causing damage and short circuits
Solution Approach 1:
A coating layer containing silicon is applied to the end surface of the negative electrode core body. This coating acts as an intermediary between the core body and the separator, preventing direct contact while maintaining battery reliability. The coating layer specifically addresses the risk of short circuits without requiring major structural changes to the electrode plate.
Solution Approach 2:
The coating containing silicon is applied selectively to the end surface of the negative electrode core body where contact with the separator is most likely to occur. This localized treatment provides protective functionality precisely where needed, rather than requiring comprehensive protection across the entire electrode structure.
2Reliability
If a coating containing silicon is formed on the end surface of the core body, then contact between the core body and separator is suppressed, but the manufacturing process becomes more complex
Solution Approach 1:
The coating process modifies the surface properties of the negative electrode core body by depositing a silicon-containing layer. This parameter change (adding a coating layer) provides the necessary protective function to prevent contact with the separator, accepting the trade-off of additional manufacturing steps for improved reliability.
Data Source
AI summary
The present invention provides: an electrode plate for secondary batteries, which has high reliability; and a secondary battery which uses this electrode plate. A negative electrode plate for secondary batteries, which comprises: a negative electrode core body that is formed of a metal; and negative electrode active material layers that are formed on both surfaces of the negative electrode core body. This negative electrode plate has a first edge and a negative electrode tab which protrudes from the first edge; and a coating film containing silicon is formed on the end face of the negative electrode core body at the first edge. A secondary battery according to the present invention is provided with a positive electrode plate and the negative electrode plate.