Battery Thermal Threshold Control Based on State of Health
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Solution Overview
Problem
Electrified vehicles face challenges in managing battery temperature effectively, as existing thermal management systems do not adequately adjust temperature thresholds based on battery state of health, leading to inefficiencies and potential battery degradation.
Innovation Solution
A thermal management system in electrified vehicles that adjusts a plurality of battery temperature thresholds based on the battery's state of health, using a controller to determine which thresholds are met or exceeded and commanding the system to thermally condition the battery accordingly, with adjustments made when the state of health is outside a predefined range, prioritizing battery health or efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed temperature thresholds are used for thermal management, then the system operation is simple, but battery health deteriorates when state of health is outside predefined range
Solution Approach 1:
The patent implements dynamic temperature thresholds that automatically adjust based on real-time battery state of health measurements. When SOH is below a first threshold, lower temperature thresholds are applied; when SOH is above a second threshold, higher temperature thresholds are applied. This dynamic adaptation resolves the contradiction by maintaining battery health through SOH-aware threshold adjustment while keeping the control logic relatively simple.
Solution Approach 2:
The system changes the temperature parameter thresholds based on the battery's state of health parameter. By monitoring SOH and adjusting the temperature thresholds accordingly, the system adapts thermal management parameters to current battery conditions, improving reliability without requiring complete system redesign.
2Reliability
If dynamic temperature threshold adjustment is implemented, then battery health is preserved, but system complexity increases
Solution Approach 1:
The controller continuously monitors battery state of health and dynamically adjusts temperature thresholds in real-time based on SOH levels. This dynamic operation enables the system to preserve battery health by applying appropriate thermal constraints while the controller handles the complexity of continuous monitoring and adjustment logic.
Solution Approach 2:
The system implements a feedback loop where the controller monitors battery state of health, compares it against predefined ranges, and adjusts temperature thresholds accordingly. This feedback mechanism ensures battery health preservation while concentrating the complexity within the controller's decision-making logic rather than the overall system architecture.
3Temperature
If aggressive thermal conditioning is applied, then battery temperature is controlled, but battery lifespan decreases due to excessive intervention
Solution Approach 1:
The system changes the temperature threshold parameters based on battery state of health. When SOH is high, more permissive (higher) temperature thresholds are allowed, reducing thermal intervention. When SOH is low, more conservative (lower) thresholds are applied to prevent further degradation. This parameter adaptation resolves the contradiction by adjusting temperature control aggressiveness according to battery condition.
Solution Approach 2:
The system applies partial thermal conditioning only when necessary based on SOH levels and temperature conditions. Rather than continuous aggressive conditioning, the system activates thermal management only when temperature thresholds are exceeded, and the degree of conditioning varies with SOH. This partial action approach extends battery lifespan while maintaining necessary temperature control.
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 preserves battery health when it is below the predefined range and prioritizes efficiency when it is above, optimizing the vehicle's performance and extending battery lifespan by dynamically managing thermal conditions.
Implementation Method 1
a thermal management system configured to thermally condition the battery at one of a plurality of thermal conditioning levels
Data Source
AI summary
This disclosure relates to an electrified vehicle with a thermal management system for a battery. A corresponding method is also disclosed. An example electrified vehicle includes a battery and a thermal management system configured to thermally condition the battery at one of a plurality of thermal conditioning levels. Each of the thermal conditioning levels corresponds to a respective one of a plurality of battery temperature thresholds. The electrified vehicle further includes a controller. The controller is configured to determine which of the plurality of battery temperature thresholds is met or exceeded based on a temperature of the battery and to command the thermal management system to thermally condition the battery at corresponding one of the plurality of thermal conditioning levels. Further, when a state of health of the battery is outside a predefined range, the controller is configured to adjust each of the plurality of battery temperature thresholds.