All-Solid-State Battery Assembly for Interface Pressure Stability
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Solution Overview
Problem
All-solid-state batteries face challenges such as electrode active material expansion and contraction during charging/discharging, leading to potential separation of the interface between the electrode active material and the solid electrolyte, which reduces performance.
Innovation Solution
An all-solid-state battery assembly that includes a housing, a constraining pad, and a driving unit to control the pressure applied to the battery, allowing for real-time pressure acquisition and adjustment to maintain optimal pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If all-solid-state battery uses solid electrolyte to improve stability and energy density, then structural stability and miniaturization are improved, but electrode active material expansion and contraction during charging/discharging causes interface separation and performance reduction
Solution Approach 1:
The patent applies a spring mechanism that dynamically adjusts the pressure applied to the all-solid-state battery during charging and discharging cycles. The spring automatically compresses and extends in response to electrode volume changes, maintaining continuous contact between the electrode active material and solid electrolyte without requiring manual intervention or fixed pressure structures.
Solution Approach 2:
The patent changes the pressure parameter applied to the battery by using a spring with specific elastic properties. The spring constant and pre-compression force are carefully selected to provide optimal pressure that accommodates electrode expansion and contraction while preventing interface separation, thus adapting the pressure parameter to the dynamic needs of the battery operation.
2Volume of moving object
If all-solid-state battery is miniaturized with high energy density, then volume efficiency is improved, but pressure control becomes more critical to prevent interface separation
Solution Approach 1:
The spring mechanism is a self-regulating component that automatically adjusts pressure based on the electrode's volume changes during charging and discharging. It requires no external control system, sensors, or power source, making it particularly suitable for miniaturized batteries where adding complex control systems would defeat the purpose of miniaturization.
Solution Approach 2:
The spring acts as an intermediary mechanical element between the battery housing and the electrode assembly. It mediates the interaction by providing a compliant pressure application mechanism that can accommodate manufacturing tolerances and electrode dimensional variations while maintaining reliable interface contact.
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 solution effectively addresses the performance reduction issues by maintaining stable pressure on the battery, preventing interface separation and enhancing overall battery performance and safety.
Implementation Method 1
a spring surrounding the all-solid-state battery in a state of pressing the all-solid-state battery
Data Source
AI summary
Disclosed is an all-solid-state battery assembly including an all-solid-state battery including a plurality of electrode layers and a plurality of solid-electrolyte layers laminated in a lamination direction; a housing accommodating the all-solid-state battery; a constraining pad between a first inner surface of the housing and the all-solid-state battery in the lamination direction; and a driving unit connected to the constraining pad to cause the constraining pad to control a magnitude of a pressure applied to the all-solid-state battery.