Alternating Battery Charge Discharge for Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Energy storage devices with multiple batteries face challenges in efficiently managing temperature and state of charge to prevent capacity deterioration, particularly when both batteries have different characteristics and deterioration factors that fluctuate with state of charge.
Innovation Solution
An energy storage device comprising a high-capacity battery and a high-output battery, with a converter and control unit that alternately charges and discharges them when temperatures are below a threshold, determining which battery to discharge first based on its state of charge to minimize capacity deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If both batteries are warmed up using conventional methods, then the temperature increases to normal operating range, but the capacity deterioration increases due to excessive charge/discharge cycles
Solution Approach 1:
The control unit alternates between charging and discharging the first and second batteries in periodic cycles. This periodic action generates heat through internal resistance while limiting the total number of cycles, thereby warming up the batteries without causing excessive capacity deterioration
Solution Approach 2:
The control unit dynamically adjusts the state of charge parameters of the second battery based on its capacity deterioration factor fluctuations. By changing the state of charge parameter adaptively, the system minimizes capacity deterioration while maintaining effective warm-up functionality
2Productivity
If the second battery is used for warm-up without considering state of charge fluctuations, then warm-up efficiency improves, but capacity deterioration increases due to larger fluctuations
Solution Approach 1:
The control unit continuously monitors the state of charge of the second battery and uses this feedback information to determine the optimal discharge/charge sequence. This feedback mechanism allows the system to maintain high warm-up efficiency while adapting to capacity deterioration factor fluctuations to prevent excessive degradation
Solution Approach 2:
The control unit dynamically adjusts the operation mode based on real-time battery conditions. When the capacity deterioration factor fluctuation is large, the system modifies the charge/discharge strategy to reduce stress on the second battery, thereby maintaining productivity while protecting against reliability degradation
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 warms up both batteries while preventing capacity deterioration, improving warm-up efficiency and reducing the number of charge/discharge cycles, thus extending the lifespan of both energy storage components.
Implementation Method 1
a converter to convert at least one of a first voltage output from the first energy storage and a second voltage output from the second energy storage
Data Source
AI summary
A second energy storage has a second capacity deterioration factor which has a fluctuation with respect to a state of charge larger than a fluctuation of a first capacity deterioration factor. Circuitry is configured to control a converter to discharge one of the first energy storage and the second energy storage to charge another of the first energy storage and the second energy storage alternately when first temperature of the first energy storage and second temperature of the second energy storage are equal to or lower than a temperature threshold. The circuitry is configured to determine which of the first energy storage and the second energy storage is controlled to be discharged first based on the state of charge of the second energy storage, before the circuitry starts controlling the converter.