Solar Vehicle Battery Switching to Prevent HV Battery Polarization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Constant charging of a high-voltage battery with power generated by a solar photovoltaic power generation device leads to polarization, reducing the accuracy of State Of Charge (SOC) estimation and resulting in power wastage when charging is interrupted to prevent polarization.
Innovation Solution
A vehicle system with a solar photovoltaic power generation device, high-voltage and low-voltage batteries, switches, and a control device that manages power distribution between the batteries to avoid polarization by predicting idle time and transferring power to the low-voltage battery during prolonged parking, thereby eliminating polarization and utilizing generated power efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power generated by the solar photovoltaic power generation device is constantly supplied to the high-voltage battery, then the high-voltage battery is continuously charged, but polarization occurs in the high-voltage battery which reduces the accuracy of SOC derivation
Solution Approach 1:
The control device predicts the idle time before the vehicle is parked and, based on this prediction, proactively interrupts the power supply to the high-voltage battery when the predicted idle time exceeds the polarization elimination time. This preliminary action prevents polarization from occurring in the first place, maintaining SOC derivation accuracy while minimizing power wastage.
2Measurement precision
If the supply of power from the solar photovoltaic power generation device to the high-voltage battery is interrupted to eliminate polarization, then the polarization is eliminated and SOC accuracy is maintained, but the power generated by the solar photovoltaic power generation device is wasted
Solution Approach 1:
The control device uses predictive control by estimating the idle time before parking occurs. When the predicted idle time is longer than the polarization elimination time, it interrupts power supply in advance, preventing polarization rather than reacting to it after occurrence. This approach maintains SOC accuracy while minimizing energy wastage by avoiding unnecessary interruptions.
Solution Approach 2:
The control device dynamically adjusts the power supply strategy based on the predicted idle time parameter. When the predicted idle time exceeds the polarization elimination time threshold, the system changes the power supply state from continuous to interrupted, optimizing the balance between preventing polarization and utilizing solar power efficiently.
3Measurement precision
If the vehicle is left parked for a long time, then polarization has sufficient time to eliminate, but the power generated during this period cannot be utilized if the high-voltage battery is not charged
Solution Approach 1:
The control device acts as an intermediary that manages power distribution between the solar photovoltaic device and the high-voltage battery based on the predicted idle time. When the predicted idle time is sufficient, it mediates by interrupting power supply to prevent polarization; when the predicted idle time is insufficient, it mediates by maintaining power supply to maximize power utilization, thus optimizing both SOC accuracy and power utilization.
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
Power generated by the solar photovoltaic power generation device is utilized without waste by effectively managing power distribution to prevent polarization in the high-voltage battery, ensuring accurate SOC estimation and efficient energy use.
Implementation Method 1
a solar photovoltaic power generation device
Data Source
AI summary
A processor of a control device of a vehicle performs control to set a first switch to an on state such that power generated by a solar photovoltaic power generation device is supplied to a high-voltage battery while the vehicle is in a ready-to-travel state; in response to a transition from the ready-to-travel state to a parked state, derives a predicted idle time indicating a predicted value of a time for which the vehicle is left idle; determines whether the predicted idle time is longer than a specific time including a polarization elimination time for eliminating polarization of the high-voltage battery; and when it is determined that the predicted idle time is longer than the specific time, performs control to set the first switch to an off state and a second switch to an on state such that the power is supplied to the low-voltage battery.