Vehicle Battery Charge Timing for Low-Temperature Self-Heating
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Solution Overview
Problem
Existing charge and discharge management systems for vehicles increase power consumption by using heaters to raise the temperature of power storage devices, which can be inefficient and costly.
Innovation Solution
The system manages external charging and discharging of power storage devices based on scheduled departure times and environmental temperatures, terminating charging or discharging closer to departure times when temperatures are low and further from departure times when temperatures are high to optimize temperature rise while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater is used to raise the temperature of the power storage device, then the temperature of the power storage device increases, but the power consumption increases
Solution Approach 1:
The power storage device heats itself through the internal resistance during charging and discharging operations. The management system utilizes the natural heat generation from the electrochemical reactions and electrical resistance within the battery, eliminating the need for external heating devices and reducing power consumption while maintaining operational temperature requirements
Solution Approach 2:
The management system converts the harmful effect of power loss during charging/discharging (heat generation that was previously considered waste) into a beneficial effect by utilizing this heat to raise the battery temperature to optimal operating levels, thereby eliminating the need for separate heating systems
2Temperature
If external charging is performed to supplement power consumed by the heater, then the power storage rate decreases, but the temperature of the power storage device increases
Solution Approach 1:
The system utilizes the power storage device's own charging and discharging cycles to generate heat, rather than relying on external charging to supplement heater consumption. This self-heating approach during normal operation preserves the power storage rate while achieving temperature management goals
3Temperature
If external charging is performed to raise temperature, then the temperature of the power storage device increases, but the power consumption of the power system increases
Solution Approach 1:
The system converts the waste heat generated during normal charging and discharging operations into useful thermal energy for temperature management. By controlling the timing and rate of charging/discharging, the system raises battery temperature without requiring additional external power input, thus reducing overall power system consumption
Solution Approach 2:
The management system employs periodic charging and discharging cycles to generate heat on demand. By strategically timing these cycles based on temperature requirements and operational schedules, the system achieves temperature management without continuous external power input, reducing overall power consumption
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
This approach effectively raises the temperature of power storage devices at scheduled departure times while reducing power consumption compared to traditional heating methods, thereby enhancing efficiency and reducing energy costs.
Implementation Method 1
When the external charging or the external power supply is performed while the vehicle is parked, the temperature of the power storage device rises by charging or discharging
Data Source
AI summary
A charge and discharge management system for managing charging/discharging of a power storage device in a plurality of vehicles having a power storage device and capable of performing external charging for charging the power storage device using electric power from an external power supply and external power supply for supplying power from the power storage device to the outside of the vehicle. A system obtains the scheduled departure times of a plurality of parked vehicles, and determines, among the plurality of vehicles, vehicles whose outside air temperature is lower than the lowest temperature in a predetermined temperature range. To terminate external charging or external power supply at a time closer to a scheduled departure time than a vehicle under environmental conditions.