Battery Cell Insulation Structure for Tab-to-Shell Short Prevention
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Solution Overview
Problem
The challenge of maintaining reliable insulation between conductive paths of different polarities within a battery cell to prevent short circuits is a critical issue in battery technology, particularly in electric vehicles where safety is paramount.
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, provides insulation from different directions, optimizing space utilization and reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation pieces are added to insulate the electrode assembly from the shell, then the reliability of insulation is improved, but the device complexity increases
Solution Approach 1:
The insulation piece integrates multiple insulation functions into a single component. The first insulation portion insulates the electrode assembly from the first end wall, while the second insulation portion insulates the electrode assembly from the sidewall, combining what could have been separate insulation elements into one unified structure.
Solution Approach 2:
The insulation piece serves multiple insulation purposes simultaneously. It provides electrical isolation between the electrode assembly and different parts of the shell (end wall and sidewall), making a single component perform multiple insulation functions that would otherwise require separate elements.
2Reliability
If the second insulation portion protrudes toward the electrode assembly, then the insulation effectiveness is improved, but the space for electrode assembly is reduced
Solution Approach 1:
The second insulation portion protrudes locally toward the electrode assembly only at specific positions where insulation is most needed, rather than uniformly reducing space throughout. This localized protrusion provides enhanced insulation effectiveness at critical interfaces while minimizing overall space consumption.
Solution Approach 2:
The insulation piece utilizes the radial dimension by having the second insulation portion protrude toward the electrode assembly from the sidewall, creating insulation in a direction perpendicular to the main axis of the battery cell, thereby effectively using three-dimensional space for insulation purposes.
3Ease of operation
If the guide portion is added to facilitate assembly, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The guide portion is pre-formed as an integral part of the insulation piece, creating a built-in assembly aid that guides the electrode assembly into the correct position during installation. This preliminary structural feature simplifies the assembly process without requiring separate tools or additional steps.
Solution Approach 2:
The guide portion acts as an intermediary element between the insulation piece and the electrode assembly, facilitating their interaction during assembly. It provides a mechanical interface that guides and aligns components, making the assembly process smoother and more reliable.
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.