All-Solid-State Battery Exterior Structure for Depressurization Insulation
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Solution Overview
Problem
Existing all-solid-state batteries face challenges with exterior bodies made of laminated films that are difficult to obtain, expensive, and prone to short circuits due to depressurization, affecting reliability and production costs.
Innovation Solution
An all-solid-state battery design using a metal laminated film with an insulating film surrounding the laminate, allowing depressurization of the interior to prevent short circuits and reduce material requirements, thereby improving reliability and lowering production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminated film is used as the exterior body to meet processability, insulating properties, and thermal resistance conditions, then the battery structure is complete, but the film is difficult to obtain or expensive
Solution Approach 1:
The exterior body is divided into multiple layers: a base exterior body layer and additional insulating film layers. This segmentation allows each layer to have specialized functions, reducing the need for a single complex laminated film that must meet all requirements simultaneously, thereby lowering production costs while maintaining reliability.
Solution Approach 2:
The patent uses composite material structures where the exterior body is combined with insulating film layers. This composite approach allows the system to achieve the required insulating properties and thermal resistance through material combination rather than requiring a single expensive laminated film, resolving the contradiction between performance and manufacturing ease.
2Productivity
If the inside of the exterior body is depressurized, then the battery density is improved, but short circuit occurs between the power generating element and the metal layer
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the power generating element and the metal exterior body. This mediator prevents direct contact and potential short circuits while allowing the interior to be depressurized for improved battery density, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The insulating film is applied in advance to the exterior body or power generating element before assembly. This preliminary protective action prevents the harmful effect of short circuits from occurring when the interior is depressurized, allowing the battery to achieve high density without compromising reliability.
Data Source
Figure 1A~1B
Figure 2
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AI summary
An all-solid-state battery (10) disclosed herein includes a laminate (100) that includes at least one power generating element (110), an insulating film (120) that is disposed to surround the laminate (100), and an exterior body (130) inside which the laminate (110) and the insulating film (120) are housed. The exterior body (130) is formed using a metal laminated film. The inside of the exterior body (130) is depressurized.