Flat Electrode Assembly Layout to Suppress Electrolyte Squeeze-Out
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Solution Overview
Problem
Conventional battery structures are inadequate in preventing electrolyte solution squeeze-out during high-rate charging/discharging, leading to increased resistance.
Innovation Solution
The battery design features a flat electrode assembly with a specific configuration where the second region of the electrode plate is concentrated at the end portion and connected to a current collector, with a defined angle and length relationship between the connection points, which reduces the likelihood of electrolyte solution squeeze-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electrode assembly is expanded and contracted during high-rate charging/discharging, then the battery can deliver high power, but the electrolyte solution is squeezed out and resistance increases
Solution Approach 1:
The electrode plate is divided into a first region with active material layer and a second region without active material layer. The second region is concentrated at the end portion and connected to the current collector, creating a segmented structure that prevents electrolyte squeeze-out during expansion and contraction cycles
Solution Approach 2:
The second region of the electrode plate is concentrated at the end portion along the width direction (second direction orthogonal to the winding axis), creating a three-dimensional concentration pattern. This spatial arrangement ensures the end portion maintains structural integrity during high-rate charging/discharging operations
2Loss of substance
If the second region is concentrated at the end portion and connected to current collector, then electrolyte solution loss is suppressed, but the structural complexity increases
Solution Approach 1:
The electrode plate has different regional characteristics: the first region contains active material for electrochemical reactions while the second region is free of active material and concentrated at the end portion for structural support and electrolyte retention. This local differentiation solves the electrolyte loss problem without requiring complex overall restructuring
Data Source
AI summary
A first angle (θ1) formed between a second straight line (L2) and a third straight line (L3) is more than 55°. A first length (D1) represents a straight line distance between a first point (A) and a second point (B), and a second length (D2) represents a length of a first electrode core body between the first point (A) and the second point (B). On this occasion, the second length (D2) is 1 time or more and 1.1 times or less as large as the first length (D1).