Battery Charging Control Using Deterioration-Based Power Limits
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Solution Overview
Problem
Existing charging systems do not consider the state of the batteries when determining power input and output, leading to potential deterioration due to unsuitable charging and discharging conditions.
Innovation Solution
A control device that adjusts power input and output to low-voltage batteries based on index values indicating deterioration, setting a specified range for safe operation, using sensors to monitor battery health and adjust converters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power from solar panel is supplied to low-voltage battery and high-voltage battery based only on generated power value, then charging system operation is simplified, but battery deterioration occurs due to unsuitable charging conditions
Solution Approach 1:
The control device acquires index values indicating battery state (deterioration degree, temperature, charge level) and uses this feedback to dynamically adjust power input/output to the low-voltage battery. This feedback mechanism ensures charging conditions are suitable for battery health while maintaining automated control.
Solution Approach 2:
The control device dynamically adjusts the power input and output to the low-voltage battery based on real-time battery state index values. The power flow is not fixed but adapts to changing battery conditions, optimizing both battery health and system operation.
2Reliability
If power input and output to low-voltage battery is adjusted based on battery state index values, then battery deterioration is suppressed, but control system complexity increases
Solution Approach 1:
The control device performs multiple functions: it manages power flow from the solar panel to both low-voltage and high-voltage batteries, monitors battery state through index values, and adjusts power input/output based on battery conditions. This multi-functionality is achieved within a single control device rather than requiring separate systems.
Solution Approach 2:
The control device changes operational parameters (power input and output levels) based on battery state index values. By adjusting these parameters dynamically, the system optimizes battery health without requiring fundamentally new control mechanisms.
3Reliability
If specified range of power input and output is set for low-voltage battery, then battery deterioration is suppressed, but power conversion efficiency may be reduced
Solution Approach 1:
The control device applies partial action by adjusting power input and output within a specified range rather than maximizing or minimizing power flow. This partial adjustment is sufficient to protect battery health while avoiding excessive power conversion losses that would occur with more aggressive control measures.
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 solution effectively suppresses battery deterioration by optimizing power flow according to battery state, enhancing conversion efficiency and reducing power reduction, thereby extending battery life.
Implementation Method 1
The solar panel is configured to generate power by receiving irradiation of sunlight
Implementation Method 2
The first converter is configured to convert a voltage of the power from the solar panel and output voltage-converted power
Implementation Method 3
The second converter is configured to convert a voltage of the power from the first converter and a voltage of power from the low-voltage battery and output voltage-converted power
Implementation Method 4
The low-voltage battery is configured to be charged by receiving the power from the first converter
Implementation Method 5
The high-voltage battery is configured to be charged by receiving the power from the second converter
Data Source
AI summary
A control device of a charging system is configured to execute acquiring a first index value indicating a deterioration degree of a low-voltage battery of the charging system, acquiring a second index value indicating a degree of whether or not a state in which the low-voltage battery is placed is a state in which the state is likely to deteriorate, and setting a specified range that is a range of input and output power to the low-voltage battery based on the first index value and the second index value.