Battery Electrode Assembly Barrier Against Metal Foreign Matter
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Solution Overview
Problem
Existing batteries are susceptible to internal short-circuiting due to metal foreign matter entering the electrode assembly during assembly, which is not effectively addressed by existing methods, particularly when the electrode assembly is inserted in a sealed container.
Innovation Solution
A battery design that includes a porous body between the electrode assembly and the sealing plate, with the electrode assembly having insulative surfaces covered by a porous body to prevent metal foreign matter from entering the assembly during welding of tabs to current collectors, and a manufacturing process that involves stacking electrode plates with separators and introducing electrolyte through a sealed introduction hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If assembly is performed in a clean room with conventional methods (blowing air, suction, magnetic attraction, or wiping), then foreign matter removal is attempted, but metal foreign matter can still enter the electrode assembly and cause internal short-circuiting
Solution Approach 1:
An insulating member is introduced as an intermediary component between the electrode assembly and the sealing plate. This insulating member acts as a barrier that prevents metal foreign matter from directly contacting the electrode assembly, thereby eliminating the harmful effect without requiring complex clean room procedures or multiple removal steps
Solution Approach 2:
The insulating member is installed beforehand in the sealing plate's insulating member installation groove before the electrode assembly is placed. This preliminary placement ensures that the protective barrier is already in position to prevent foreign matter entry, rather than attempting to remove foreign matter after assembly
2Reliability
If a porous body is disposed between the electrode assembly and current collectors, then metal foreign matter entry is blocked, but the structure becomes more complex
Solution Approach 1:
The insulating member is merged with the sealing plate structure by providing an installation groove within the sealing plate itself. This integration combines two components into one unified structure, reducing overall device complexity while maintaining the protective function against metal foreign matter
Solution Approach 2:
The insulating member is placed specifically at the location where metal foreign matter most likely to enter (between the electrode assembly and sealing plate interface). This localized placement provides targeted protection without requiring insulating materials throughout the entire battery structure, thus minimizing added complexity
Data Source
AI summary
A battery having an electrode assembly including a positive-electrode and a negative-electrode terminal attached to a sealing plate. The electrode assembly has surfaces parallel to a direction in which the positive and the negative electrode plates are stacked, the surfaces including one surface that faces the sealing plate. The positive and the negative electrode plate respectively include positive-electrode and a negative-electrode tabs respectively electrically connected to the positive-electrode and the negative-electrode terminals through positive-electrode and negative-electrode current collectors disposed between the electrode assembly and the sealing plate. The positive-electrode and the negative electrode tabs are welded to the respective positive-electrode and negative-electrode current collectors. A porous body that is electrically insulative is disposed between the one surface and the positive-electrode current collector and between the one surface and the negative-electrode current collector.