Pouch Battery Cell Tab Bending for Stronger Internal Connections
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Solution Overview
Problem
Pouch-type battery cells experience degradation in internal electrical connection performance due to damage from external forces, leading to reduced battery performance and safety concerns.
Innovation Solution
The battery cell design includes an electrode assembly with tabs featuring an extension and bent portion, connected by an adapter with a connecting and conducting portion, which enhances structural strength and balances current paths to improve electrical connection resilience and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tabs are extended directly from electrode bodies without bending, then the electrical connection path is shorter and simpler, but the tabs are vulnerable to damage from external forces
Solution Approach 1:
The tab structure incorporates a bent portion instead of a straight extension, creating a curved geometry that enhances structural strength. The bent portion acts as a reinforcement that resists external forces better than a straight tab would, while maintaining electrical conductivity through the curved path.
2Reliability
If the connecting portion is made thicker to improve current conduction, then electrical performance improves, but the adapter occupies more space and increases weight
Solution Approach 1:
The thickness of the connecting portion is optimized within a specific range (1≤T2/T1≤4) to achieve the best balance between electrical performance and spatial efficiency. This parameter optimization ensures sufficient current conduction capability while minimizing the volume occupied by the adapter in the battery cell.
3Reliability
If multiple sub-connecting portions are used to balance current paths, then internal resistance differences are reduced, but the adapter structure becomes more complex
Solution Approach 1:
The connecting portion is divided into multiple sub-connecting portions that connect to different bent portions of the tabs. This segmentation creates multiple parallel current paths, balancing the current distribution and reducing internal resistance differences across the battery cell.
4Strength
If the bent portion thickness is increased to improve structural strength, then tab durability improves, but the adapter thickness ratio becomes unbalanced
Solution Approach 1:
The thickness ratio between the bent portion (T1) and connecting portion (T2) is controlled within a specific range (1≤T2/T1≤4) to maintain structural balance. This ensures that the bent portion has sufficient strength while the connecting portion maintains appropriate dimensions for electrical performance and spatial efficiency.
Data Source
AI summary
A battery cell, a battery, an electricity consuming device and a preparation method are provided. The battery cell includes an electrode assembly and an adapter. The electrode assembly includes at least two electrode bodies arranged side by side along a first direction and tabs extending from the electrode bodies. The tab includes an extension portion and a bent portion, the extension portion extends from the electrode body along a second direction, the bent portion is connected with an end of the extension portion away from the electrode body and extends along a first direction, an adapter is connected with the tabs, the current of the electrode body is conducted by the adapter to the outside, a bending arrangement of the tabs enhances their structural strength, avoiding the problem of degradation in internal electrical connection performance of the battery due to damage to the tabs by an external force.