Solid-State Battery Cooling Control Near Output Temperature Limits
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Solution Overview
Problem
Solid-state batteries face challenges in maintaining output efficiency due to excessive temperature rise, leading to potential output limitations when the battery temperature exceeds the permissible upper limit, which existing cooling systems struggle to manage effectively.
Innovation Solution
A battery cooling system that includes a solid-state battery, a heat-exhausting device, and a cooling circuit with a refrigerant, where a battery control device regulates the output current to balance heat generation and absorption, ensuring the battery temperature remains within permissible limits by equalizing heat absorption and exhaust amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the service temperature range of the solid-state battery is expanded, then the battery can operate in wider temperature conditions, but the output limitation starting temperature approaches the output permission upper-limit temperature, reducing safe operating margin
Solution Approach 1:
The cooling control device performs preliminary cooling action when the battery temperature approaches the output limitation starting temperature. By detecting the temperature trend and proactively increasing cooling capacity before the temperature reaches the upper-limit, the system maintains a safe temperature margin while allowing expanded service temperature range operation.
Solution Approach 2:
The system continuously monitors battery temperature and dynamically adjusts cooling control based on real-time temperature feedback. When temperature approaches critical thresholds, the feedback loop triggers increased cooling power to maintain the temperature within safe operating margins, enabling reliable operation across expanded temperature ranges.
2Device complexity
If conventional battery temperature control is used, then the system structure is simple, but it cannot prevent the battery temperature from reaching the output permission upper-limit temperature when excessive temperature rise occurs
Solution Approach 1:
The cooling control device dynamically adjusts cooling capacity based on real-time battery temperature conditions. Unlike static conventional control, the system varies cooling power levels according to temperature trends, heat generation rates, and proximity to critical thresholds, enabling effective temperature management without requiring overly complex multi-component systems.
3Reliability
If the battery temperature is strictly controlled to prevent reaching upper-limit, then output safety is improved, but output current must be limited, reducing power output
Solution Approach 1:
The cooling control device operates in periodic cycles, intensifying cooling action during high-load periods when heat generation is elevated, then reducing cooling demand during lower-load periods. This periodic modulation allows the battery to deliver high power output when needed while maintaining temperature safety through targeted cooling intervals, rather than continuous output limitation.
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 system effectively prevents the battery temperature from reaching the output permission upper-limit temperature, maintaining stable output and preventing sudden output limitations, thereby enhancing energy efficiency and performance.
Implementation Method 1
a cooling circuit through which a refrigerant circulates between the solid-state battery and the heat-exhausting device, and the refrigerant absorbs heat from the solid-state battery to cool the solid-state battery
Implementation Method 2
a cooling circuit through which a refrigerant circulates between the solid-state battery and the heat-exhausting device
Implementation Method 3
the heat-exhausting device exhausts heat absorbed from the solid-state battery
Data Source
AI summary
A battery cooling system includes a solid-state battery, a heat-exhausting device, a cooling circuit through which a refrigerant circulates between the solid-state battery and the heat-exhausting device, and a battery control device. The refrigerant absorbs heat from the solid-state battery. The heat-exhausting device exhausts heat absorbed from the solid-state battery. When a battery temperature of the solid-state battery exceeds an output limitation starting temperature, the battery control device controls an output current of the solid-state battery such that a heat generation amount of the solid-state battery, a heat absorption amount of the refrigerant from the solid-state battery, and a heat exhaust amount of the refrigerant in the heat-exhausting device are equal to each other, and controls the battery temperature such that the battery temperature is equal to or higher than the output limitation starting temperature, and is lower than an output permission upper-limit temperature of the solid-state battery.