Battery Tab Restraint Structure to Prevent Internal Short Circuits
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Solution Overview
Problem
Secondary batteries face a short-circuit risk due to the tab of the electrode assembly being inserted into the main body, which affects operational safety.
Innovation Solution
The secondary battery design incorporates a cap plate assembly with a first and second pressing-against member that restrict the tab's position, reducing the likelihood of the tab being inserted into the main body and causing a short circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the tab is allowed to extend freely from the main body, then the electrical connection is simple and easy to manufacture, but the tab may be inserted into the main body causing a short circuit between positive and negative electrode sheets
Solution Approach 1:
The pressing-against member acts as an intermediary component between the tab and the main body. It restricts the tab's position by pressing against it, preventing the tab from being inserted into the main body while maintaining electrical connection. This mediator structure resolves the contradiction by providing both mechanical restraint and electrical continuity.
Solution Approach 2:
The pressing-against member is extracted as a separate functional component from the electrode assembly structure. By isolating the tab restriction function into a dedicated component, the design prevents short circuits while maintaining the simplicity of electrical connection between the tab and electrode terminal.
2Reliability
If pressing-against members are added to restrict the tab position, then the operational safety is improved, but the device complexity increases
Solution Approach 1:
The pressing-against member is designed to press locally against specific portions of the tab rather than constraining the entire tab structure. This localized approach provides the necessary safety function while minimizing the addition of complex structural elements. The pressing-against member can be a simple component that only intervenes where needed to prevent tab insertion.
Data Source
AI summary
The present application relates to a secondary battery, a battery module and a device. The secondary battery includes a cap plate assembly; an electrode assembly, including a main body and a tab extending from the main body; an electrode terminal, arranged at the cap plate assembly to electrically connect with the tab; a first pressing-against member, arranged between the cap plate assembly and the main body, herein an accommodating space is formed between the first pressing-against member and the electrode terminal; a second pressing-against member, arranged between the cap plate assembly and the main body; herein a part of the tab, that passes between the first pressing-against member and the second pressing-against member and extends into the accommodating space, is connected to the electrode terminal, and the first pressing-against member and the second pressing-against member press against two opposite surfaces of the tab respectively.