Charging Control Thresholds Based on Low-Voltage Battery Deterioration
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Solution Overview
Problem
Existing charging systems struggle to determine when to supply power from a low-voltage battery to a high-voltage battery based on a fixed power value criterion, which may not account for the state of the low-voltage battery, potentially leading to inefficient power distribution and battery deterioration.
Innovation Solution
A control device that adjusts power distribution by setting a specified power value based on indices indicating battery deterioration and charge state, allowing for optimized power flow between batteries via a voltage converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed power value criterion is used to determine whether to supply power from the low-voltage battery to the high-voltage battery, then the control logic is simple, but the power distribution may not be optimal considering the battery state
Solution Approach 1:
The patent applies dynamics by making the power value criterion variable rather than fixed. The control device dynamically adjusts the criterion for determining whether to supply power from the low-voltage battery based on the state of charge of the low-voltage battery. When the state of charge is high, the criterion is set to a higher value; when the state of charge is low, the criterion is set to a lower value. This dynamic adjustment optimizes power distribution efficiency while maintaining manageable control logic complexity.
2Reliability
If power is supplied from the low-voltage battery to the high-voltage battery when solar panel output is low, then the high-voltage battery charging is ensured, but the low-voltage battery may deteriorate faster
Solution Approach 1:
The patent applies parameter changes by adjusting the power value criterion based on the state of charge parameter of the low-voltage battery. By changing the criterion parameter dynamically according to the battery's state of charge, the system ensures high-voltage battery charging reliability when solar output is low while preventing excessive discharge of the low-voltage battery that would cause deterioration. The state of charge parameter serves as the basis for adapting the power supply decision threshold.
3Stability of the object's composition
If the low-voltage battery is used to supplement power when solar panel output is insufficient, then the overall power supply stability is improved, but the low-voltage battery's service life may be reduced
Solution Approach 1:
The patent applies feedback by continuously monitoring the state of charge of the low-voltage battery and using this information to adjust the power value criterion. The control device receives feedback about the battery state and adapts the decision-making threshold accordingly. This feedback mechanism allows the system to maintain power supply stability by utilizing the low-voltage battery when necessary while preventing over-discharge that would reduce service life, thus resolving the contradiction between stability and duration.
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
Enhances the probability of suitable power distribution decisions based on battery state, reducing battery deterioration and improving efficiency by adjusting power flow according to battery health.
Implementation Method 1
a solar panel configured to generate electric power by being irradiated with sunlight
Implementation Method 2
a voltage converter configured to step up electric power from the solar panel and the low-voltage battery and output the electric power
Data Source
AI summary
A control device performs a first supply process of controlling a voltage converter to supply power from a solar panel to a high-voltage battery via the voltage converter while setting input-output power of a low-voltage battery to zero on the condition that a supplied power value is determined to be equal to or more than a specified power value. The control device performs a second supply process of controlling the voltage converter to supply power from the solar panel and the low-voltage battery to the high-voltage battery via the voltage converter on the condition that the supplied power value is determined to be less than the specified power value. The control device sets the specified power value based on one or more of a first index value indicating the degree of deterioration of the low-voltage battery and a second index value indicating whether the low-voltage battery is likely to deteriorate.