Rechargeable Battery Electrode Member Conduction Structure
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Solution Overview
Problem
Lithium ion batteries face internal short circuits and potential fires or explosions due to burrs formed on electrode foils during nailing tests, leading to poor conduction and reduced service life.
Innovation Solution
An electrode assembly with an insulation substrate and a conduction layer, where the conduction layer includes a coated active material portion and an uncoated current guide portion, connected by a conduction structure, enhancing electrical connectivity between current guide portions without direct contact, thus improving conduction performance and preventing burr formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal foil (aluminum or copper) is used as electrode material, then electrical conduction is achieved, but burrs form during nailing tests causing internal short circuits
Solution Approach 1:
The patent introduces a nail protection layer as an intermediary substance between the nail and the metal foil electrode. This protective layer prevents direct contact and mechanical damage during nailing tests, eliminating burr formation while maintaining electrical conduction through the underlying metal foil structure.
Solution Approach 2:
The electrode structure is designed as a composite material system combining metal foil (for conduction) with a protective coating layer (for mechanical protection). This composite approach allows the electrode to simultaneously achieve electrical conductivity and resistance to burr formation during nailing tests.
2Reliability
If insulation substrate is used to prevent short circuits, then electrical isolation is achieved, but conduction capability between current guide portions deteriorates
Solution Approach 1:
The electrode is segmented into functionally distinct regions: active material areas coated with insulation for electrochemical reactions, and uncoated conduction layers serving as current guides. This segmentation allows simultaneous achievement of electrical isolation where needed and low-resistance conduction pathways where required.
Solution Approach 2:
The insulation coating is applied selectively only to specific regions of the electrode where electrical isolation is required, while leaving other regions (current guide portions) uncoated to maintain low electrical resistance. This local differentiation of properties optimizes both isolation and conduction performance.
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 enhances the conduction capability of the electrode member, reducing resistance and the risk of overheating, thereby extending the service life and safety of lithium ion batteries.
Implementation Method 1
the conduction layer includes a first portion and a second portion extending from the first portion, wherein the first portion is coated with an active material and the second portion is not coated with the active material
Data Source
AI summary
The present disclosure relates to the technical field of rechargeable battery and, particularly, relates to an electrode member, an electrode assembly and a rechargeable battery. The electrode member includes an electrode body and a conduction structure, the electrode body comprises an insulation substrate and an conduction layer placed on a surface of the insulation substrate, the conduction layer includes a first portion and a second portion extending from the first portion, the first portion is coated with an active material while the second portion is not coated with the active material, and the conduction structure is connected to the second portion. After the electrode assembly is formed by winding or stacking of the electrode members, adjacent current guide portions are electrically connected to one another by the conduction structure, without being limited by the insulation substrate, so that the conductivity of the electrode member is effectively improved.