Stacked Electrode Structure with Insulating Base for Battery Durability
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Solution Overview
Problem
Existing secondary batteries for Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV) face challenges in durability and flexibility due to inadequate support and insulation of electrode structures, leading to increased inner resistance and potential short circuits.
Innovation Solution
A secondary battery design featuring stacked electrode structures with a base material layer providing electrical insulation, where cathode and anode expansion portions are bonded to collecting members, and the base material layer is exposed to prevent short circuits, enhancing durability and reducing flexible volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode structures are stacked without adequate support and insulation, then device complexity is reduced, but reliability deteriorates due to potential short circuits and increased inner resistance
Solution Approach 1:
The battery is divided into multiple electrode structures stacked in series, with each structure containing cathode and anode layers separated by insulating base material layers. This segmentation allows independent support and insulation of each electrode unit, improving overall reliability while maintaining manageable complexity through modular design
Solution Approach 2:
Insulating base material layers are introduced as intermediary elements between adjacent electrode structures. These layers prevent direct contact between cathode and anode, eliminating short circuit risks while providing structural support. The collecting members also act as intermediaries to distribute mechanical stress and electrical current uniformly across the electrode structures
2Duration of action of stationary object
If electrode structures are supported at multiple points, then durability is improved, but device complexity increases due to additional collecting members and expansion portions
Solution Approach 1:
The collecting members serve dual functions: they provide mechanical support at multiple points to enhance durability, and they collect electrical current from the electrode structures. By merging the support function and current collection function into a single component, the design improves durability without proportionally increasing complexity
Solution Approach 2:
The insulating base material layers perform multiple roles simultaneously: they provide electrical insulation between adjacent electrodes, offer mechanical support to the electrode structures, and prevent direct contact during thermal expansion. This multi-functionality reduces the need for separate components, improving durability while controlling complexity
3Reliability
If base material layer is exposed to prevent short circuits, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insulating base material layers are designed to extend beyond the electrode layers beforehand, creating an exposed insulating barrier at the edges. This prior extension ensures that even with manufacturing variations, the insulating layer will always be exposed to prevent short circuits, reducing the stringency of precision requirements while maintaining high reliability
Data Source
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Figure 4A~4D
AI summary
The disclosure discusses a secondary battery with superior durability and a vehicle configured to mount the same. The secondary battery comprises an electrode structure wherein a cathode is formed at one side of a base material layer having electrical insulating property and an anode is formed at another side of the base material layer. A plurality of electrode structures are stacked with an electrolyte layer interposed therebetween such that the cathode and anode of adjacent electrode structures are on opposite sides of the electrolyte layer.