Integrated Lid Spacer for Lithium-Ion Battery Assembly
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Solution Overview
Problem
There is a need for improved assembly workability and safety in lithium-ion secondary batteries, particularly in the integration of components like the spacer, lid member, and electrode groups, to enhance manufacturing efficiency and prevent short-circuits and movement-related issues within the battery.
Innovation Solution
A battery design featuring a spacer integrally formed of electrically insulating material with a top plate portion sandwiched between the leads and lid member, and a peripheral plate portion extending to cover the leads and current collecting tabs, which facilitates easy assembly and prevents contact with the container, thereby ensuring electrical insulation and restricting movement of the electrode groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components (spacer, lid member, electrode groups) are used in the battery assembly, then electrical insulation and movement restriction are achieved, but assembly workability and manufacturing efficiency deteriorate
Solution Approach 1:
The patent combines the spacer and lid member into a single integrated component called the integrated lid member. This integration maintains the electrical insulation function of the original spacer while eliminating the need for separate assembly steps, thereby improving assembly workability and manufacturing efficiency without compromising reliability
2Reliability
If multiple separate components are assembled in the battery, then functional requirements are met, but manufacturing complexity and time increase
Solution Approach 1:
The integrated lid member combines multiple functional components into one piece, reducing the number of assembly operations required. This merger maintains the movement restriction function while significantly improving manufacturing efficiency by reducing assembly time and complexity
3Reliability
If the spacer is made as a separate component, then electrical insulation is provided, but the number of parts and assembly steps increase
Solution Approach 1:
The spacer functionality is merged into the lid member structure, creating a single integrated component that performs both structural support and electrical insulation functions. This reduces the total number of components and simplifies the overall battery structure while maintaining reliable electrical insulation
Data Source
AI summary
In an embodiment, a battery includes a container, a lid member, an electrode group, a current collecting tab, an electrode terminal, a lead and a spacer. The lid member is attached to a peripheral wall of the container with an opening of an inner cavity being closed. The current collecting tab protrudes in the electrode group toward a side where the lid member is located, and the lead electrically connects the current collecting tab and the electrode terminal. The spacer is integrally formed of an electrically insulating material. The spacer includes a top plate portion sandwiched between the lead and the lid member, and a peripheral plate portion extending from the top plate portion toward a side where the electrode group is located and covering the lead and the current collecting tab in the inner cavity from an outer peripheral side.