All-Solid-State Battery Heating Control for Charge Pause Recovery
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Solution Overview
Problem
All-solid-state batteries experience reaction unevenness along the thickness direction of the negative electrode, leading to increased overvoltage and inconvenience when charging is resumed after a pause, such as lithium ion deposition or premature full-charge termination.
Innovation Solution
An all-solid-state battery system with a heating device and control device that raises the battery temperature after resuming charging, setting a higher target temperature when voltage exceeds a reference voltage, and adjusting heating time based on temperature and SOC to mitigate reaction unevenness and reduce overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging is resumed after a pause shorter than a predetermined time, then charging efficiency is improved, but reaction unevenness occurs leading to overvoltage and lithium ion deposition
Solution Approach 1:
The control device detects when charging is paused and calculates the pause duration. When charging resumes after a pause shorter than the predetermined time, the heating device is activated in advance to raise the battery temperature before normal charging proceeds, preventing reaction unevenness from occurring
Solution Approach 2:
The heating device changes the temperature parameter of the all-solid-state battery by raising it to a higher temperature after resumption of charging. This parameter change promotes mitigation of reaction unevenness and reduces overvoltage, preventing lithium ion deposition
2Reliability
If heating is applied to raise battery temperature after resuming charging, then reaction unevenness is mitigated, but energy consumption increases
Solution Approach 1:
The heating device is activated only when specific conditions are met (charging pause shorter than predetermined time and voltage exceeds reference voltage), raising the battery temperature in advance before normal charging proceeds. This targeted preliminary heating reduces overall energy consumption compared to continuous heating
Solution Approach 2:
The control device continuously monitors battery voltage through the voltage sensor. When the detected voltage exceeds the reference voltage, the control device activates the heating device to raise temperature. This feedback-based control ensures heating is applied only when necessary, optimizing energy consumption
3Reliability
If voltage threshold is set low to detect overvoltage early, then safety is improved, but false full-charge termination occurs
Solution Approach 1:
The reference voltage is dynamically adjusted based on battery temperature. As temperature changes, the reference voltage threshold changes accordingly, allowing early detection of overvoltage conditions while accounting for temperature effects on voltage characteristics. This prevents false full-charge termination while maintaining safety
Solution Approach 2:
The voltage sensor continuously monitors battery voltage and provides feedback to the control device. The control device compares the detected voltage against the temperature-adjusted reference voltage, enabling accurate detection of actual overvoltage conditions while distinguishing them from normal voltage variations, thus preventing false full-charge termination
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
Prevents inconvenience from reaction unevenness by reducing overvoltage and ensuring accurate charging completion, promoting efficient and safe battery operation.
Implementation Method 1
The heating device heats the all-solid-state battery
Data Source
AI summary
A vehicle 1 equipped with an all-solid-state battery system includes a battery that is an all-solid-state battery, an electric heater that heats the battery, and an ECU that controls the electric heater. When charging of the battery is resumed after a pause shorter than a predetermined time, the ECU controls the electric heater to raise a temperature of the battery after resumption of the charging to a temperature higher than a temperature of the battery before the pause of the charging.