Battery Cell Insulation Assembly for Compact Tab Isolation
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Solution Overview
Problem
Current methods for dielectrically protecting electrode assemblies in battery cells, such as insulation tape folding, are time-consuming and increase the outline dimension of the battery cell, reducing its energy density.
Innovation Solution
A battery cell design featuring discrete insulation pieces, including a first insulation piece between the electrode assembly and a cover plate, and a second insulation piece between the tab and the housing, connected by a snap-fit mechanism, to minimize thickness and outline dimension increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation tape folding process is used to dielectrically protect the electrode assembly, then safety performance is improved, but the outline dimension of the battery cell increases and energy density reduces
Solution Approach 1:
The insulation assembly is divided into multiple discrete insulation pieces (first insulation piece, second insulation piece, third insulation piece) that are separately positioned and connected. This segmentation allows each piece to be optimally sized for its specific function, reducing the total volume occupied by the insulation assembly compared to a single folded tape structure.
Solution Approach 2:
The discrete insulation pieces are arranged in different spatial dimensions and orientations within the battery cell. The first insulation piece is between the electrode assembly and cover plate, the second is between the tab and housing, and the third connects them. This multi-dimensional arrangement optimizes space utilization and minimizes the outline dimension increase.
2Reliability
If insulation tape folding process is used to dielectrically protect the electrode assembly, then safety performance is improved, but assembly time increases and productivity reduces
Solution Approach 1:
The insulation assembly is segmented into discrete pieces that can be independently manufactured and prepared beforehand. This allows for pre-assembly and quality control of each piece, and enables parallel assembly operations where multiple insulation pieces can be installed simultaneously or in sequence without the time-consuming folding operations required by traditional insulation tape methods.
3Productivity
If discrete insulation pieces are used instead of folded insulation tape, then assembly efficiency is improved and outline dimension increase is reduced, but manufacturing complexity increases
Solution Approach 1:
Multiple discrete insulation pieces (first, second, and third insulation pieces) are merged into a unified insulation assembly through connection structures. The connection structures integrate the separate pieces into a cohesive unit that functions as a complete insulation system, simplifying the assembly process while maintaining the volume-reducing benefits of discrete pieces.
Data Source
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AI summary
The present application relates to a battery cell, a battery and an electric device, which belong to the technical field of battery manufacturing. The battery cell provided in the present application comprises: a shell; a cover plate; an electrode assembly, which comprises a main body and a tab extending from an end of the main body in a first direction, wherein the cover plate is located on one side of the main body in a second direction, and the first direction is perpendicular to the second direction; a first insulation member, which is arranged between the electrode assembly and the cover plate, so as to insulate and isolate the electrode assembly from the cover plate; and a second insulation member, which is arranged between the main body and an inner surface of the shell, so as to insulate and isolate the tab from the shell. The second insulation member and the first insulation member are separately arranged and connected to each other. The present application further provides a battery and an electric device, both of which comprise the battery cell; and same is convenient to assemble, and has high safety performance and energy density.