Battery Charge Scheduling via Internal Resistance Estimation
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Solution Overview
Problem
Conventional battery charging and discharging methods do not effectively manage temperature, leading to increased internal resistance and accelerated deterioration, particularly in batteries used for automobiles and stationary units, where high temperatures exacerbate these issues.
Innovation Solution
A charge/discharge scheduling system that includes a temperature measurer, current/voltage measurer, internal resistance estimator, and load estimator, which creates schedules to minimize load on the battery unit by estimating internal resistance and temperature changes, thereby reducing thermal stress and prolonging battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery units are charged or discharged in a fixed charge/discharge pattern without considering deterioration, then charge/discharge operations can be performed simply and quickly, but the temperature largely increases inside the battery unit resulting in deterioration of the battery unit
Solution Approach 1:
The system performs preliminary estimation of internal temperature and internal resistance before charge/discharge operations. By predicting the thermal state and resistance changes in advance, the system can pre-adjust charge/discharge patterns to prevent excessive temperature rise, thereby protecting battery durability while maintaining operational efficiency
Solution Approach 2:
The charge/discharge pattern is dynamically adjusted based on real-time monitoring of internal temperature and internal resistance. The system transitions from fixed patterns to adaptive patterns that respond to changing battery conditions, optimizing the balance between charge/discharge performance and thermal management
2Reliability
If battery units are placed under high temperature condition for a long period of time, then the internal resistance increases while the deterioration of the battery units is accelerated, but maintaining low temperature reduces charge/discharge efficiency
Solution Approach 1:
The system changes operational parameters (charge/discharge current, voltage, and timing) based on the estimated internal temperature and internal resistance. When temperature and resistance indicate deteriorating conditions, the system adjusts parameters to reduce thermal stress and extend lifespan, while maintaining sufficient charge/discharge efficiency through intelligent parameter optimization
3Reliability
If a charge/discharge schedule is created to minimize load on the battery unit by estimating internal resistance and temperature changes, then battery deterioration is reduced, but the system complexity increases
Solution Approach 1:
The system implements feedback mechanisms where internal temperature and internal resistance estimates continuously inform charge/discharge scheduling decisions. This closed-loop control enables the system to automatically optimize battery health without requiring complex manual intervention, as the feedback-driven algorithms autonomously adjust schedules based on battery state
Solution Approach 2:
The battery management system performs self-monitoring and self-adjustment of charge/discharge schedules based on its own internal state measurements. By using its own sensors and estimators to guide its own operation, the system reduces the need for external complex control mechanisms while effectively protecting battery health
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
The system effectively minimizes battery deterioration by optimizing charge/discharge patterns based on real-time internal resistance and temperature data, reducing the progression of internal resistance and maintaining optimal battery health.
Implementation Method 1
a temperature measurer, which measures temperature of the battery unit
Implementation Method 2
a current/voltage measurer, which measures a voltage and a current at the battery unit
Implementation Method 3
an internal resistance estimating unit, which estimates an internal resistance of the battery unit
Implementation Method 4
a temperature estimating unit, which estimates time-transition of temperature of the battery unit based on the internal resistance of the battery unit
Implementation Method 5
a load estimator, which estimates a load amount applied to the battery unit based on the temperature time-transition of the battery unit
Data Source
AI summary
There is provided a charge/discharge scheduling system in which a measurer measures temperature of a battery unit, a current/voltage measurer measures a voltage and a current at the battery unit, an estimating unit estimates an internal resistance of the battery unit, a scheduler creates, based on a charge/discharge instruction specifying charge amount or discharge amount, a charging schedule or a discharging schedule for the battery unit, a temperature estimating unit estimates time-transition of temperature of the battery unit, based on the internal resistance of the battery unit, the load estimator estimates a load amount applied to the battery unit based on the temperature time-transition of the battery unit provided that the charging schedule or the discharging schedule is carried out, the charge/discharge scheduler creates the charge schedule or the discharge schedule so that the load amount applied to the battery unit is a minimum or smaller than a threshold value.