Battery Cell Tab Layout With Integrated Wall Connection
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Solution Overview
Problem
Existing battery cells face difficulties in assembly, which hinders the improvement of production efficiency and complicates the electrical connections, especially due to the need for special-shaped structures and components that increase manufacturing complexity.
Innovation Solution
The battery cell design includes a shell with a wall portion and electrode assembly, where the first and second tabs are positioned at the same end, with a connecting portion protruding from the wall portion to facilitate electrical connections, and a groove is formed on the wall portion to enhance the electrical connection and reduce assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the first tab and second tab are arranged at opposite ends of the electrode assembly, then the electrical connection is simplified, but the space utilization is reduced and energy density is lowered
Solution Approach 1:
The patent positions both tabs at the same end of the electrode assembly (same-side arrangement) rather than opposite ends, utilizing the three-dimensional space differently. This dimensional reorganization allows both tabs to access the wall portion from the same side, improving space utilization and energy density while maintaining electrical connection simplicity through the wall portion's dual-surface design.
Solution Approach 2:
The wall portion is segmented into two functional surfaces: a first surface with a connecting portion for electrical connection to the first tab, and a second surface with a groove for electrical connection to the second tab. This segmentation allows independent optimization of each connection interface, simplifying the overall electrical connection structure despite the tabs being at the same end.
2Reliability
If a special-shaped structure component is arranged between the wall portion and the first tab to facilitate electrical connection, then the electrical connection effect is improved, but the assembly complexity increases and production efficiency decreases
Solution Approach 1:
The patent extracts the electrical connection function from a separate special-shaped component and integrates it directly into the wall portion structure. The connecting portion protruding from the first surface and the groove on the second surface are formed as integral parts of the wall portion, eliminating the need for additional intermediate components and simplifying assembly while maintaining reliable electrical connection.
Solution Approach 2:
The wall portion merges multiple functions: structural containment of the electrode assembly, electrical connection to both tabs (through the connecting portion and groove), and mechanical support. This consolidation of functions into a single component reduces the number of parts and assembly steps, improving production efficiency without compromising connection reliability.
3Reliability
If the projection area of the groove is increased to enhance welding connection, then the electrical connection reliability is improved, but the structural strength of the wall portion is reduced
Solution Approach 1:
The groove is designed with localized depth and positioning on the second surface of the wall portion, creating a local quality change that enhances welding connection area without compromising the overall structural integrity. The groove concentrates the welding interface in a specific region while maintaining the wall portion's global strength through optimized geometry and material distribution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves energy density, simplifies assembly, reduces the difficulty of electrical connections, and enhances the production efficiency of battery cells by optimizing the electrical connection effect and space utilization.
Implementation Method 1
a groove bottom wall of the groove is welded to the first current collecting member to electrically connect the first tab and the wall portion, or the groove bottom wall of the groove is welded to the first tab to electrically connect the first tab and the wall portion
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus are provided. The battery cell includes a shell, an electrode terminal, and an electrode assembly. The shell has a wall portion, and the electrode terminal is mounted on the wall portion in an insulated manner. The electrode assembly includes a main body, a first tab, and a second tab of opposite polarities, both arranged at one end of the main body facing the wall portion in the thickness direction. A connecting portion protrudes from a first surface of the wall portion toward the electrode assembly and is electrically connected to the first tab. The electrode terminal is electrically connected to the second tab. This configuration optimizes the height of the first tab, improves contact between the first tab and the connecting portion, and eliminates the need for a special-shaped connecting component, thereby reducing assembly complexity.