Battery Cell Insulator Layout to Block Shell Short-Circuit Paths
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Solution Overview
Problem
Internal short circuits in batteries, caused by ions reaching the shell and causing excessive heat and potential fires, pose a significant safety risk.
Innovation Solution
A battery cell design featuring a first insulating member with a through hole that misaligns with the electrode assembly projections, eliminating linear ion channels between the electrode assembly and the shell, thereby reducing the risk of short circuits and shell corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a through hole is provided in the insulating member for assembly positioning, then assembly quality is improved, but ions may pass through the hole to cause short circuits and safety issues
Solution Approach 1:
The patent resolves the contradiction by shifting the problem from a 2D plane to 3D space. The through hole is positioned such that its projection on the bottom wall does not overlap with the electrode assembly projection, creating spatial separation in the thickness direction. This dimensional approach allows the hole to serve its positioning function while preventing ion passage paths.
Solution Approach 2:
The patent applies local quality by creating a specific non-overlapping region where the through hole projection and electrode assembly projection are spatially separated. This localized spatial arrangement ensures that the through hole maintains its assembly positioning function while the misaligned region prevents ion contact with the shell.
2Reliability
If the insulating member completely covers the bottom wall to prevent short circuits, then safety is improved, but assembly positioning becomes difficult
Solution Approach 1:
The patent segments the insulating member's coverage area by introducing a through hole at a specific location. This segmentation creates a localized opening that does not compromise overall safety because the hole's projection is misaligned with the electrode assembly projection, while simultaneously providing a positioning feature for assembly.
3Ease of operation
If ions are allowed to reach the shell for normal battery operation, then battery function is maintained, but shell corrosion and short circuits occur
Solution Approach 1:
The patent uses the misaligned spatial relationship between the through hole projection and electrode assembly projection as an intermediary protective mechanism. This spatial arrangement allows the insulating member to maintain its ion-blocking function while the through hole provides necessary structural features, preventing ions from reaching the shell through the hole.
Data Source
AI summary
A battery cell includes a shell, an electrode assembly, and a first insulating member. The shell has an opening and a bottom wall opposite to the opening. The electrode assembly is accommodated in the shell. The first insulating member is used for separating the electrode assembly and the bottom wall. The first insulating member is provided with a first through hole, and projections of the electrode assembly and the first through hole on the bottom wall partially overlap or do not overlap in a thickness direction of the bottom wall.