Battery Current Collector Covering for Foreign Object Control
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Solution Overview
Problem
Existing battery technologies face challenges in effectively reducing foreign objects, particularly metal foreign objects, that can cause internal short circuits during assembly, without compromising battery capacity.
Innovation Solution
The battery design incorporates a current collector system with first and second current collectors welded together at a welding point covered by a covering member, which reduces dust and foreign objects from entering the electrode body, and includes a tab connection to external terminals via these current collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bag-shaped porous body is inserted between the electrode body and the lid to reduce foreign objects, then foreign object reduction is improved, but the battery capacity is reduced due to consumption of active material
Solution Approach 1:
The invention extracts and removes the problematic porous body from the battery structure. Instead of inserting a porous body between the electrode body and lid, the patent uses a sealing plate with sealing protrusions that engage with recesses in the exterior body, eliminating the need for a porous body and thus preventing active material consumption while maintaining foreign object reduction capability
Solution Approach 2:
The invention introduces a sealing plate as an intermediary component between the exterior body and the electrode body. The sealing plate includes sealing protrusions that fit into recesses of the exterior body, creating a seal that prevents foreign object entry without requiring a porous body that would consume active material
2Reliability
If metal foreign objects are removed by air blowing, suction, magnetic force adsorption, or wiping with polishing tape during assembly, then foreign object reduction is improved, but the manufacturing complexity and time are increased
Solution Approach 1:
The invention performs preliminary action by providing a sealing plate with sealing protrusions that are pre-configured to engage with recesses in the exterior body. This sealing structure is built into the battery assembly process itself, preventing foreign object entry at the source rather than requiring separate removal steps using air blowing, suction, or magnetic adsorption equipment
Solution Approach 2:
The sealing plate structure serves dual functions: it seals the battery interior and simultaneously prevents foreign object entry. The sealing protrusions and recesses create a self-sealing mechanism that eliminates the need for additional foreign object removal devices or processes during assembly
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
This configuration effectively minimizes the entry of foreign objects into the battery, thereby reducing the occurrence of internal short circuits while maintaining battery capacity.
Implementation Method 1
The first current collector and the second current collector are welded to each other at a welding point covered with a covering member
Data Source
AI summary
A battery includes an electrode body obtained by stacking a positive electrode plate and a negative electrode plate with a separator interposed therebetween, an exterior body having an opening and housing the electrode body, a sealing plate sealing the opening, and an external terminal attached to the sealing plate. A tab is provided at at least one of the positive electrode plate or the negative electrode plate, and is electrically connected to the external terminal via a current collector between the electrode body and the sealing plate. The current collector includes a first current collector and a second current collector. The first current collector and the second current collector are welded to each other at a welding point covered with a covering member.