Battery Lead Resin Film Layout for Sealing and Gas Venting
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Solution Overview
Problem
Nonaqueous electrolyte batteries, such as lithium ion secondary batteries, face the challenge of gas generation during charge and discharge cycles, which can lead to damage if the gas is not properly discharged outside the battery container.
Innovation Solution
A lead for a nonaqueous electrolyte battery is designed with a conductor having a plate shape and electrically insulating resin films on both surfaces. The resin films are strategically positioned to expose end portions of the conductor and cross over the conductor, forming a seal and adjusting adhesion to facilitate gas discharge when pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resin films are disposed to cover the conductor completely for better sealing, then the sealing performance is improved, but the gas discharge function is hindered
Solution Approach 1:
The resin films are disposed with different coverage at different locations: they cover the central portion of the conductor for sealing, but leave the end portions exposed to enable gas discharge. This local differentiation resolves the contradiction between sealing and gas discharge functions.
Solution Approach 2:
The conductor is functionally segmented into a central portion (covered by resin films for sealing) and end portions (exposed for gas discharge). The resin films themselves are segmented in coverage area, creating distinct functional zones that simultaneously achieve sealing and gas venting.
2Object-generated harmful factors
If the resin films are disposed to expose the end portions of the conductor for gas discharge, then the gas discharge function is improved, but the sealing performance deteriorates
Solution Approach 1:
The resin films provide differential coverage: full coverage over the central portion maintains sealing integrity, while partial coverage at end portions allows gas discharge. This localized quality variation simultaneously achieves both sealing and gas venting functions.
3Strength
If the resin films are made to overlap significantly for better adhesion, then the adhesion strength is improved, but the flexibility and gas discharge capability are reduced
Solution Approach 1:
The resin films exhibit varying degrees of overlap and adhesion at different locations: significant overlap in central regions provides strong adhesion for sealing, while reduced overlap at end portions maintains flexibility for gas discharge. This spatial variation in adhesion quality resolves the contradiction.
Data Source
AI summary
A lead for a nonaqueous electrolyte battery includes a conductor, and a first electrically insulating resin film and a second electrically insulating resin film disposed at the upper surface and the lower surface of the conductor, respectively. With the conductor being viewed in a direction perpendicular to the upper surface, when an axis extending along selected two sides of the conductor is defined as an X-axis, the selected two sides facing each other, and an axis orthogonal to the X-axis is defined as a Y-axis, the first electrically insulating resin film and the second electrically insulating resin film are disposed so as not to cover two end portions of the conductor in a direction along the Y-axis and are disposed so as to extend along the X-axis and cross and cover, at a portion of the conductor other than the two end portions, the conductor.