Battery SOC Control via Temperature Prediction
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Solution Overview
Problem
Storage batteries used for peak shaving or peak shift experience accelerated cycle degradation due to increased current demands at low state of charge (SOC), leading to progressive degradation, especially at higher temperatures.
Innovation Solution
A management apparatus and method that control the charge and discharge of power storage devices by adjusting the target SOC levels based on predicted temperature, lowering both the charge and discharge targets as temperature increases to maintain efficient power supply while reducing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the storage battery is charged at low SOC to supply required power during discharge, then the power supply requirement is met, but cycle degradation accelerates due to increased current demands
Solution Approach 1:
The patent dynamically adjusts the charge-target SOC based on predicted battery temperature. As temperature increases, the charge-target SOC is lowered to reduce the charge-discharge capacity, thereby reducing the current demand and cycle degradation. This dynamic adjustment resolves the contradiction by adapting the power supply strategy to temperature conditions.
Solution Approach 2:
The patent changes the SOC parameter (state of charge) as a function of temperature. By lowering the charge-target SOC when temperature is high, the system reduces the amplitude of charge-discharge cycles, which reduces the current demand and slows cycle degradation while still meeting power supply requirements through adjusted capacity management.
2Duration of action of stationary object
If the charge-target SOC is lowered to reduce cycle degradation, then battery life is extended, but the available power supply capacity decreases
Solution Approach 1:
The system dynamically adjusts the charge-target SOC based on temperature predictions. By lowering SOC only when temperature is high (which accelerates degradation), the system extends battery life during critical periods while maintaining higher SOC during cooler periods to ensure adequate power supply capacity. This temporal differentiation resolves the contradiction.
Solution Approach 2:
The patent changes the charge-target SOC parameter according to temperature conditions. During high temperature periods, SOC is lowered to extend battery life; during low temperature periods, SOC is maintained at higher levels to ensure sufficient power supply capacity. This conditional parameter adjustment resolves the trade-off between battery life and power capacity.
3Productivity
If the storage battery operates at high temperature, then power supply efficiency increases, but storage degradation accelerates significantly
Solution Approach 1:
The patent applies preliminary anti-action by predicting future temperature and proactively adjusting the charge-target SOC before high temperature conditions occur. This prevents the acceleration of storage degradation by reducing charge-discharge capacity during upcoming high temperature periods, while still maintaining power supply efficiency through advance planning.
Solution Approach 2:
The system uses temperature prediction feedback to adjust the charge-target SOC. By continuously monitoring temperature trends and adjusting SOC accordingly, the system prevents storage degradation during high temperature periods while maintaining optimal power supply efficiency. The feedback loop ensures that degradation prevention measures are applied at the appropriate times.
Data Source
AI summary
A controller issues an instruction of charge and discharge control to charge a power storage device up to a first target SOC and to discharge the power storage device up to a second target SOC. The controller lowers the first target SOC and the second target SOC with an increase in predicted temperature of the power storage device in a next charge and discharge cycle. The controller lowers the first target SOC and the second target SOC such that the second target SOC is lower than the first target SOC.