Coin Battery Thin Solid Electrolyte Compression
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Solution Overview
Problem
Coin-shaped batteries with thick solid-electrolyte layers have high internal resistance, requiring rigid metal cases and sealing plates, making it difficult to reduce their weight and size.
Innovation Solution
A coin-shaped battery design featuring laminated bodies with thin solid-electrolyte layers and a pressurizing member that applies uniform pressure, reducing the need for high rigidity in the metal case and sealing plate, allowing for a lighter and more compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thick solid-electrolyte layer is used, then the battery structure is simpler, but the internal resistance increases and output decreases
Solution Approach 1:
The battery is divided into multiple battery elements stacked in series, with each element containing a thin solid-electrolyte layer. This segmentation allows the total voltage to be increased through series connection while maintaining low internal resistance in each individual element due to the thin electrolyte layer.
Solution Approach 2:
The patent transitions from a single thick electrolyte layer to multiple thin electrolyte layers arranged in series stacking. This dimensional reorganization maintains the electrical function while reducing the thickness of each individual electrolyte interface, thereby reducing internal resistance.
2Reliability
If a spring with large spring constant is used to pressurize the battery element, then contact pressure between electrodes and solid electrolyte increases, but the metal case and sealing plate must be highly rigid and thick
Solution Approach 1:
The patent employs an elastic body that can dynamically adjust to maintain contact pressure between battery elements during stacking. This elastic compression allows reliable electrical contact without requiring the metal case and sealing plate to be excessively rigid or thick, thereby reducing overall battery weight.
3Strength
If the metal case and sealing plate are formed thick for high rigidity, then structural strength is improved, but the battery weight and size increase
Solution Approach 1:
The patent optimizes the thickness and material properties of the metal case and sealing plate to achieve the minimum required structural strength. By carefully controlling these parameters and using elastic compression to maintain contact pressure, the design achieves sufficient structural rigidity with thinner, lighter 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
The design achieves sufficient output while minimizing battery size and weight, enabling higher capacity without the need for thick, rigid components.
Implementation Method 1
an elastic body that applies pressure to a battery element disposed inside a metal case
Data Source
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AI summary
A coin-shaped battery (101) includes: at least one laminated body (1 through 3) which includes a positive electrode layer (11, 21, 31), a solid-electrolyte layer (12, 22, 32), and a negative electrode layer (13, 23, 33), the positive electrode layer (11, 21, 31), the solid-electrolyte layer (12, 22, 32), and the negative electrode layer (13, 23, 33) being stacked; and an outer casing which is composed of a metal case (7) and a metal sealing plate (8) and in which the at least one laminated body (1 through 3) is enclosed. The at least one laminated body (1 through 3) is compressed by pressurization, and the solid-electrolyte layer (12, 22, 32) in the at least one laminated body (1 through 3) has an average thickness of not less than 5 µm and not more than 100 µm.