Battery Cell Terminal Structure to Reduce Tab Pleating
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Solution Overview
Problem
The reliability of large-capacity battery cells is compromised due to increased size, leading to issues such as tab dislocation and pleating during production, which affects the service life and performance.
Innovation Solution
A battery cell design featuring a position-limiting portion with a first extending section and a shortened second connecting portion for the tab, along with heat insulation and overcurrent protection mechanisms, reduces tab length and enhances structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery cell size is enlarged to achieve large capacity requirements, then the capacity is improved, but the reliability is reduced due to tab dislocation and pleating
Solution Approach 1:
The tab is segmented into multiple parts: a first connecting portion connected to the active substance-coated portion, and a second connecting portion connected to the position-limiting portion. This segmentation allows the tab to be shorter while maintaining connection functionality, thereby reducing dislocation and pleating risks in large-capacity battery cells.
Solution Approach 2:
The position-limiting portion with the first extending section serves as an intermediary component between the tab and the battery shell. It provides a dedicated connection point that constrains the tab's position, preventing dislocation and pleating while maintaining the electrical connection function.
2Reliability
If the tab length is reduced to minimize dislocation and pleating, then the reliability is improved, but the connection stability may be affected
Solution Approach 1:
The position-limiting portion is pre-configured with a first extending section that protrudes from the terminal body. This preliminary structural arrangement ensures that when the tab is installed, it naturally aligns with the extending section, providing immediate positional constraint and connection stability without requiring additional fastening mechanisms.
Solution Approach 2:
The position-limiting portion extends in a direction perpendicular to the terminal body's main axis, creating a new spatial dimension for tab connection. This dimensional change allows the tab to be secured in multiple directions, enhancing connection stability despite the reduced tab length.
Data Source
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AI summary
Embodiments of the present application relate to the technical field of batteries, and provide a battery cell, a battery and an electrical device. The battery cell includes a shell, an electrode assembly and an electrode terminal. The shell includes a wall portion, the wall portion being provided with a lead-out hole. The electrode assembly is accommodated in the shell, and the electrode assembly includes an active substance-coated portion and a tab, the tab being disposed at an end of the active substance-coated portion facing the wall portion. The electrode terminal includes a terminal body and a position-limiting portion, the terminal body penetrating into the lead-out hole, and the position-limiting portion including a first extending section protruding out of a peripheral surface of the terminal body along a first direction. The tab includes a first connecting portion and a second connecting portion, the second connecting portion being located at one side of the first connecting portion along the first direction, the first connecting portion being connected to the active substance-coated portion, and the second connecting portion being connected to the first extending section. This type of structure shortens the length of the second connecting portion, so that the length of the tab is shortened, thereby decreasing the possibility of dislocation and pleating of the tab in the production process, and increasing the reliability of the battery cell.