Solid Battery Over-Discharge for Internal Resistance Recovery
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Solution Overview
Problem
Solid secondary batteries face performance deterioration due to increased internal resistance from repeated charging and discharging cycles and high temperatures, making recovery of output performance difficult.
Innovation Solution
A method and device for charging solid secondary batteries that involves estimating the battery temperature and performing an over-discharge process or external short circuit to lower the voltage to a rated level before charging, with the duration of this process varying based on temperature to efficiently recover performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If repeated charge and discharge cycles are performed, then battery capacity and usage time increase, but internal resistance increases leading to deterioration of output performance
Solution Approach 1:
The patent applies preliminary action by performing an over-discharge process before charging to restore output performance. The control unit detects when output performance has deteriorated and executes an over-discharge process that discharges the battery below its normal voltage range, which removes degradation products and restores the battery's output capability before the next charging cycle.
2Reliability
If over-discharge process is performed to recover output performance, then internal resistance decreases and output performance improves, but additional time is required before charging
Solution Approach 1:
The patent applies dynamics by making the over-discharge process conditional and adaptive rather than fixed. The control unit dynamically determines whether to perform over-discharge based on real-time detection of output performance deterioration, and adjusts the discharge depth and duration based on the detected voltage levels, optimizing the recovery process to minimize time loss while maintaining effectiveness.
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 approach promptly and efficiently recovers the output performance of solid secondary batteries by reducing internal resistance, thereby extending their life cycle and improving charging efficiency.
Implementation Method 1
a solid electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer
Data Source
AI summary
A method for charging a battery is used for charging a solid secondary battery including a positive electrode active material layer, a negative electrode active material layer and a solid electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer. Specifically, the method for charging a battery includes a process for obtaining or estimating temperature of the solid secondary battery; and an over-discharge process for lowering voltage of the solid secondary battery to or below a rated voltage by performing over-discharge and/or making an external short circuit with respect to the solid secondary battery prior to a process for charging the solid secondary battery, provided that the temperature is equal to or higher than a predetermined temperature.