Solid-State Battery Pressure Receiving Member Design
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Solution Overview
Problem
Solid-state batteries can malfunction or experience excessive output due to excessive pressure during production or use, resulting from failures in the control system or pressure control devices, leading to potential destruction and reliability issues.
Innovation Solution
A solid-state battery design that includes a pressure receiving member on the outer covering, with a thickness less than the total thickness of the stack and outer covering, to prevent excessive pressure and improve reliability, durability, capacity, and output density, along with a method for producing such batteries that involves forming a stack with a positive electrode layer, a negative electrode layer, and a solid electrolyte layer, and accommodating it in an outer covering with the pressure receiving member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pressure is applied to the stack during production or use to improve contact and performance, then capacity and output are improved, but excessive pressure can cause destruction or malfunction
Solution Approach 1:
The patent introduces a pressure receiving member with a predetermined thickness that is less than the total thickness of the stack and outer covering. This member acts as a cushioning element that absorbs excess pressure before it reaches the battery stack, preventing destruction while allowing beneficial pressure application for improved contact and performance
2Ease of operation
If the control system or pressure control device fails, then pressure cannot be regulated, but without a mechanical limit the battery can be destroyed
Solution Approach 1:
The pressure receiving member serves as a mechanical intermediary between the external pressure control system and the battery stack. It provides a passive mechanical limit that prevents excessive pressure transmission to the stack, independent of the active control system's reliability
3Reliability
If the pressure receiving member thickness equals the total thickness, then maximum pressure protection is achieved, but battery capacity and output density are reduced
Solution Approach 1:
The patent optimizes the thickness parameter of the pressure receiving member by setting it to a specific range: less than the total thickness of the stack and outer covering. This parameter optimization allows the member to provide adequate pressure protection while maintaining sufficient space for the battery components to achieve high capacity and output density
Data Source
AI summary
A solid-state battery comprising a stack including at least one unit cell including a positive electrode layer including a positive electrode active material, a negative electrode layer including a negative electrode active material, and a solid electrolyte layer laminated between the positive and negative electrode layers, and an outer covering accommodating the stack, wherein the solid-state battery further including a pressure receiving member provided on at least a part of a periphery of the outer covering, and wherein the pressure receiving member has a thickness of less than a total thickness of the stack and the outer covering in a stacking direction of the unit cell.