Secondary Battery Electrode Assembly for Short-Circuit Prevention
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Solution Overview
Problem
Secondary batteries for electric vehicles and hybrid electric vehicles face issues with short-circuiting between positive and negative electrode plates due to separator curling and material layer falling during electrolyte introduction, which existing designs fail to adequately prevent.
Innovation Solution
The secondary battery design incorporates insulating sheets and tapes on the electrode assemblies adjacent to the sealing plate, with the tapes facing the electrolyte introduction hole to prevent separator curling and secure the active-material layers, ensuring electrical isolation and reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the separator is positioned adjacent to the sealing plate during electrolyte introduction, then the battery assembly is compact, but the separator curls and causes short-circuiting between electrode plates
Solution Approach 1:
An insulating sheet is introduced as an intermediary component between the separator and the sealing plate. This insulating sheet prevents direct contact and interaction between the separator edge and the sealing plate, thereby preventing separator curling while maintaining the compact battery assembly structure.
Solution Approach 2:
The insulating sheet is pre-positioned on the sealing plate before the electrode assembly is installed. This preliminary action ensures that when the separator is placed adjacent to the sealing plate, the insulating sheet is already in place to prevent curling, eliminating the need for post-assembly adjustments.
2Ease of manufacture
If the active-material layers are not secured, then the manufacturing process is simple, but the layers fall during electrolyte introduction causing short-circuiting
Solution Approach 1:
The insulating sheet is pre-positioned on the sealing plate before electrode assembly installation. This preliminary placement ensures that when active-material layers are present on the separator, they are immediately protected from falling during electrolyte introduction, without adding complex manufacturing steps.
3Device complexity
If no insulating protection is provided at the electrode assembly end, then the device structure is simple, but short-circuiting occurs between adjacent electrode plates
Solution Approach 1:
The insulating sheet serves as a mediator between the electrode assembly end and the sealing plate, providing electrical isolation without requiring complex structural modifications. This simple insulating barrier effectively prevents short-circuiting while maintaining structural simplicity.
Solution Approach 2:
The insulating sheet is implemented as a thin film component that provides effective electrical isolation and physical protection. This thin film approach maintains device simplicity while reliably preventing short-circuits between adjacent electrode plates.
Data Source
AI summary
A secondary battery includes a rectangular exterior body having an opening and containing a first electrode assembly and a second electrode assembly, a sealing plate sealing the opening, and a positive-electrode current collector. The sealing plate has an electrolytic solution introduction hole. The first electrode assembly includes a first insulating sheet on an outermost surface thereof adjacent to the second electrode assembly. The second electrode assembly includes a second insulating sheet on an outermost surface thereof adjacent to the first electrode assembly. A first tape is attached to both an outermost surface of a first positive-electrode tab group and the first insulating sheet. A second tape is attached to both an outermost surface of a second positive-electrode tab group and the second insulating sheet. At least one of the first tape and the second tape is located to face the electrolytic solution introduction hole.