Battery Heating Controller With Adaptive Heat Medium Temperature Limits
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Solution Overview
Problem
In heating systems for electric vehicles, excessive temperature of the heat medium can lead to thermal deterioration, degrading its electrical insulation properties and affecting battery charging/discharging performance, necessitating a solution to suppress thermal deterioration while maintaining heating performance.
Innovation Solution
A controller that calculates and adjusts the upper limit temperature of the heat medium based on thermal deterioration progress, using a processor to evaluate thermal deterioration and estimate the life of the heat medium, thereby optimizing temperature settings to prevent excessive degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the temperature of the heat medium is raised excessively to heat the battery, then heating performance is improved, but thermal deterioration of the heat medium progresses and electrical insulation property is degraded
Solution Approach 1:
The upper limit temperature of the heat medium is made variable rather than fixed. The processor dynamically adjusts the upper limit temperature based on the calculated thermal deterioration index, raising it when deterioration is low and lowering it when deterioration is high, thereby resolving the contradiction between maintaining heating performance and preventing thermal deterioration
Solution Approach 2:
The system changes the temperature parameter adaptively based on the thermal deterioration index. By calculating the index from temperature data and using it to adjust the upper limit temperature, the system optimizes the temperature parameter to balance heating efficiency and heat medium preservation
2Reliability
If the upper limit temperature is lowered to suppress thermal deterioration, then electrical insulation property is maintained, but heating performance is reduced
Solution Approach 1:
The system dynamically adjusts the upper limit temperature based on real-time thermal deterioration assessment. When the thermal deterioration index is low, the upper limit temperature is raised to improve heating performance. When the index is high, the upper limit temperature is lowered to protect electrical insulation properties, thereby resolving the contradiction between heating efficiency and reliability
3Ease of operation
If a fixed upper limit temperature is used, then control is simple, but either thermal deterioration progresses or heating performance is insufficient
Solution Approach 1:
The system uses the heat medium's own temperature history data to calculate the thermal deterioration index, which then automatically adjusts the upper limit temperature. This self-adjusting mechanism eliminates the need for complex external control while optimizing both heat medium life and heating performance
Solution Approach 2:
The processor calculates the thermal deterioration index based on temperature data and uses this feedback to adjust the upper limit temperature. This closed-loop feedback control automatically balances heating performance and heat medium preservation without requiring complex manual intervention
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 effectively secures the performance and extends the life of the heat medium by dynamically adjusting the upper limit temperature, ensuring both efficient heating and preventing thermal deterioration.
Implementation Method 1
heats a battery using a liquid heat medium
Implementation Method 2
heat exchange between a liquid heat medium and the battery
Data Source
AI summary
A temperature management system heats a battery using a liquid heat medium (an LLC). A battery ECU, which is a controller for the temperature management system, includes a processor that calculates an upper limit temperature of the LLC during heating of the battery. The processor lowers the upper limit temperature, as thermal deterioration of the LLC progresses.