Electrode Assembly Edge Wrapping to Prevent Battery Short Circuits
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Solution Overview
Problem
Batteries face safety risks due to the risk of short circuits caused by foreign matter on electrode plates, which can lead to accidents during use and maintenance.
Innovation Solution
An electrode assembly is designed with a first electrode plate and two separators on opposite sides, wrapping around the edge of the electrode plate without a tab, to prevent foreign matter from causing short circuits, and a 'Z+U' stacking method for improved production efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single separator is used between electrode plates, then the structure is simple, but the risk of short circuit from foreign matter increases
Solution Approach 1:
The separator system is segmented into a first separator and a second separator positioned on opposite sides of the electrode plate. This segmentation allows each separator to independently perform the function of preventing foreign matter penetration, thereby reducing short circuit risk while maintaining a manageable structural complexity through modular arrangement.
Solution Approach 2:
The solution transitions from a single-layer separator configuration to a dual-layer separator configuration arranged in opposite directions. This dimensional change from one layer to two layers provides redundant protection against foreign matter, effectively reducing short circuit risk while the systematic arrangement keeps the overall structure organized and not excessively complex.
2Reliability
If the separator does not wrap around the electrode plate edge, then the manufacturing process is simpler, but foreign matter can easily cause short circuits
Solution Approach 1:
The first separator and second separator are preliminarily arranged to extend beyond the edges of the electrode plate before final assembly. This preliminary extension ensures that foreign matter is blocked at the edges before it can cause short circuits, and the wrapping configuration is established in advance to simplify the overall assembly process rather than requiring complex post-assembly adjustments.
3Productivity
If the electrode plate is not folded, then the structure is simpler, but the production efficiency of stacked batteries is reduced
Solution Approach 1:
The electrode plate is designed with foldable sections that allow it to be dynamically configured during assembly. The folding capability enables the electrode plate to adapt to different assembly positions and orientations, facilitating more efficient stacking operations and improving battery production efficiency while the folded structure remains manageable in complexity.
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
The solution effectively reduces the risk of short circuits and improves safety performance while enhancing production efficiency by using a double-layer separator wrap and the 'Z+U' stacking method for battery assembly.
Implementation Method 1
the first separator and the second separator are both turned over and enclose an edge of the first electrode plate that is provided with no tab
Data Source
AI summary
An electrode assembly and a manufacturing method therefor, a battery cell, a battery, and a power consuming device are described. The electrode assembly includes: a first electrode plate; a first separator; and a second separator. The second separator and the first separator are located on two opposite sides of the first electrode plate in a thickness direction, and the first separator and the second separator are both turned over and enclose an edge of the first electrode plate that is provided with no tab. On this basis, the safety performance of the battery can be effectively improved.