Laminate Battery Multilayer Collector Assembly Design
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Solution Overview
Problem
Lithium ion secondary batteries face challenges in achieving sufficient contact between ion-conductive layers, leading to increased contact resistance and decreased battery capacity when the ion-conductive layers are disposed on opposite sides of a resin layer in the current collector.
Innovation Solution
A laminate battery design featuring a multilayered collector assembly with an insulation layer and two electrically conductive layers, where a conductive portion made of electrically conductive material extends beyond the insulation layer to ensure electrical connection with the electrode terminal, reducing contact resistance while maintaining high energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ion conductive layers are disposed on the opposite sides of the resin layer to reduce current collector thickness and increase volumetric energy density, then the volumetric energy density is improved, but the contact between ion-conductive layers becomes insufficient causing increased contact resistance and decreased battery capacity
Solution Approach 1:
A conductive adhesive layer is introduced as an intermediary between the ion-conductive layers and the resin layer. This adhesive layer contains conductive particles that establish reliable electrical contact between the ion-conductive layers while allowing the resin layer to maintain its mechanical support function. The conductive adhesive resolves the contradiction by providing both mechanical bonding and electrical conductivity, enabling thin current collector design without sacrificing contact reliability.
Solution Approach 2:
The current collector employs a composite structure combining resin layer, ion-conductive layers, and conductive adhesive layers. This composite material approach allows each layer to perform its specific function: the resin provides mechanical strength, the ion-conductive layers enable ionic transport, and the conductive adhesive ensures electrical connectivity. This composite design achieves both reduced thickness for high volumetric energy density and sufficient contact for low contact resistance.
2Quantity of substance
If the current collector is made thinner to increase volumetric energy density, then the volumetric energy density is improved, but the structural integrity and contact reliability may be compromised
Solution Approach 1:
The current collector is segmented into multiple functional layers: resin layer for mechanical support, ion-conductive layers for ionic transport, and conductive adhesive layers for electrical connectivity. This segmentation allows each layer to be optimized for its specific function, enabling the overall structure to be thinner while maintaining or improving structural integrity and contact reliability compared to a monolithic current collector.
Solution Approach 2:
The multi-layer composite structure combines materials with complementary properties: the resin layer provides mechanical strength and flexibility, the ion-conductive layers enable lithium ion transport, and the conductive adhesive layers ensure electrical connectivity. This composite design achieves high volumetric energy density through reduced thickness while maintaining structural integrity through the synergistic combination of materials.
Data Source
AI summary
A battery including an electrode and electrode terminal, the electrode comprising a multilayered collector assembly having a multilayered portion that includes an insulation layer and two electrically conductive layers disposed on opposite sides of the insulation layer, and a conductive portion made of an electrically conductive material, connected to the two conductive layers and extending therefrom more toward a side end of the electrode than a side end of the insulation layer so as to be electrically connected to the electrode terminal, and a pair of active material layers disposed on opposite sides of the multilayered portion.