All-Solid Battery Can Structure for Low Interfacial Resistance
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Solution Overview
Problem
Existing all-solid rechargeable batteries face challenges in minimizing interfacial resistance, especially when the battery is surrounded by a can with elastic restoring force.
Innovation Solution
The design includes an all-solid cell stack surrounded by a first can and a second can, where the cans are welded together to press the cell stack, and non-welding surfaces on the cans are inserted into caps to further compress the stack, minimizing interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the all-solid cell stack is surrounded by a can with elastic restoring force, then the battery structure is more compact and stable, but the interfacial resistance of the cell stack increases
Solution Approach 1:
The can is divided into two distinct portions: a first can portion that is welded to provide structural stability, and a second can portion that is non-welded to allow elastic compression. This segmentation enables different regions of the same component to fulfill conflicting functions - the welded portion ensures structural integrity while the non-welded portion minimizes interfacial resistance through elastic deformation.
Solution Approach 2:
Different portions of the can have different welding states - the first can portion has a welded structure for stability, while the second can portion has a non-welded structure for elasticity. This local differentiation in structural properties allows the can to simultaneously provide both structural stability and low interfacial resistance where needed.
2Strength
If the can is completely welded to surround the cell stack, then the structural strength is improved, but the ability to compress the cell stack and reduce interfacial resistance is reduced
Solution Approach 1:
The can is segmented into welded and non-welded portions, allowing the welded first can portion to provide structural strength while the non-welded second can portion provides compression capability to reduce interfacial resistance.
Solution Approach 2:
The welding state of the can is changed as a structural parameter - by making only the first portion welded and leaving the second portion non-welded, the can achieves both strength and compressibility. The non-welded portion can elastically deform to compress the cell stack, reducing interfacial resistance.
3Reliability
If the non-welding surface is inserted into the cap, then the compression force on the cell stack is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The non-welded second can portion and the cap are combined into an integrated compression mechanism. When assembled, the non-welded can portion is inserted into the cap, creating a unified structure that applies compression force to the cell stack, enhancing contact without requiring complex additional components.
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 interfacial resistance of the all-solid cell stack even when it is surrounded by a can, enhancing the battery's performance and stability.
Implementation Method 1
a first can covering a lower portion of the all-solid cell stack, a second can that covers an upper portion of the all-solid cell stack and is welded to the first can to press the all-solid cell stack in a direction of the first can
Implementation Method 2
A distance between the first non-welding surface and the second can may have a first length when the all-solid cell stack is pressed, and may has a second length longer than the first length due to restoring force of the first can when the first non-welding surface is inserted into the first cap
Data Source
AI summary
An all-solid rechargeable battery includes an all-solid cell stack, a first can covering a lower portion of the all-solid cell stack, the first can including a first welding surface having an uneven structure, and a second can covering an upper portion of the all-solid cell stack, the second can being welded to the first can via the first welding surface of the first can, and the all-solid cell stack being pressed between the first can and the second can.