Wound Electrode Assembly with Spaced Tabs for Alignment
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Solution Overview
Problem
Existing battery cell designs face challenges in die-cutting tabs due to misalignment and precision issues, leading to reduced effective connection and increased weight, which affects battery performance.
Innovation Solution
The electrode assembly design features a tab group with tabs of opposite polarities separated by electrode sheet layers, wound around a axis to form a winding body, allowing for improved alignment and reduced weight by extracting tabs from a single end, facilitating easier die-cutting and electrolyte infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs are extracted from each electrode sheet layer, then the effective connection between tabs and electrode terminal is improved, but the difficulty in die-cutting tabs increases and misalignment control becomes difficult
Solution Approach 1:
The patent applies partial action by extracting tabs from only some electrode sheet layers rather than all layers. Specifically, tabs are extracted from first and second electrode sheet layers that are spaced apart, leaving intermediate layers without tabs. This reduces the total number of tabs requiring die-cutting while still providing sufficient connection points for effective electrical connection to the electrode terminal.
2Reliability
If tabs are arranged densely to improve connection, then the effective connection is improved, but the misalignment of tabs after winding increases
Solution Approach 1:
The patent segments the tab extraction locations into distinct groups spaced along the winding direction. Instead of having tabs from every layer stacked at the same location, the tabs are divided into multiple groups corresponding to different electrode sheet layers. This segmentation distributes the tabs spatially, reducing the stacking density at any single location and thereby improving alignment precision after winding.
3Reliability
If the number of tabs is increased to improve connection, then the effective connection is improved, but the weight of the electrode assembly increases
Solution Approach 1:
The patent implements partial action by extracting tabs from only a subset of electrode sheet layers rather than from every layer. This selective extraction provides sufficient electrical connection points through the tab group while removing unnecessary tabs and associated materials, thereby reducing the overall weight of the electrode assembly without compromising connection effectiveness.
Data Source
AI summary
An electrode assembly and manufacturing method and device thereof, a battery cell, a battery, and an electric device are provided. The electrode assembly includes: a first electrode sheet and a second electrode sheet of opposite polarities, wherein the first electrode sheet and the second electrode sheet both include a main body and at least one tab group, the first electrode sheet and the second electrode sheet are winded around a winding axis such that their respective main bodies overlap to form a winding body, and after the main bodies have been winded a plurality of electrode sheet layers are formed along a radial direction of the winding main body. The tab group includes a plurality of stacked tabs which protrude from the main body, and at least two adjacent tabs in the tab group are separated by at least one electrode sheet layer of same polarity in the radial direction.