Battery Cell Insulation Layout for Short-Circuit Isolation
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Solution Overview
Problem
Maintaining reliable insulation between conductive paths of different polarities inside a battery cell to avoid short circuits is a critical challenge.
Innovation Solution
A battery cell design incorporating a first and second insulation portion in the shell, with the second insulation portion protruding towards the electrode assembly, and a guide portion that tapers in thickness to facilitate assembly and reduce space occupation, while a connecting portion ensures structural integrity and reduces capacity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation pieces are added to improve insulation reliability, then short circuit risk is reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple insulation functions into a single integrated insulation piece. The first insulation portion and second insulation portion are formed as one unified component that simultaneously provides insulation between the electrode assembly and both the end wall and sidewall, reducing the number of separate parts while maintaining comprehensive insulation coverage
Solution Approach 2:
The insulation piece serves multiple functions: the first insulation portion prevents short circuits between the electrode assembly and end wall, the second insulation portion prevents short circuits between the electrode assembly and sidewall, and the guide portion facilitates assembly. This multi-functional design improves reliability without adding multiple separate components
2Reliability
If the second insulation portion protrudes to provide insulation between electrode assembly and sidewall, then insulation reliability is improved, but space for electrode assembly is reduced
Solution Approach 1:
The second insulation portion is positioned locally at the periphery where insulation between the electrode assembly and sidewall is needed. This localized approach provides insulation coverage only where required, rather than adding insulation material throughout the entire battery cell volume, thus minimizing space occupation while maintaining insulation reliability
3Volume of moving object
If the guide portion tapers in thickness to reduce space occupation, then volume efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The guide portion employs a tapered thickness design where the thickness gradually changes from the first insulation portion toward the open end. This gradual parameter change allows the insulation piece to fit into tight spaces and reduce volume occupation while providing sufficient clearance for assembly, balancing space efficiency with manufacturability
Data Source
AI summary
This application provides a battery cell, a battery, and an electrical device. The battery cell includes a shell, an electrode post, an electrode assembly, and an insulation piece. The shell includes a sidewall and a first end wall connected to the sidewall. The electrode post is dielectrically mounted on the first end wall of the shell. The electrode assembly is located in the shell. The electrode assembly includes a first tab. The first tab faces the first end wall and is electrically connected to the electrode post. The insulation piece includes a first insulation portion located between the bottom wall and the first tab, and a second insulation portion peripherally disposed at an outer edge of the first insulation portion and protrudes toward a side at which the electrode assembly is located.