EV Battery Temperature-Based Driving Limits for Faster Charging
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Solution Overview
Problem
Existing methods for determining the range of electric motor vehicles do not effectively account for the temperature of the energy storage device, leading to inefficient charging processes due to unfavorable battery temperatures, which increase charging time and reduce charging power.
Innovation Solution
A method where the control device determines a maximum value for driving operation parameters such as speed and acceleration based on the current temperature of the energy storage device, ensuring it reaches a charging temperature range optimal for charging, thereby reducing charging duration and maintaining battery health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the energy storage device is charged at unfavorable temperatures (outside charging temperature range), then charging can proceed, but charging power is reduced and charging time increases
Solution Approach 1:
The control device determines a maximum value for driving operation parameters in advance, based on the current temperature of the energy storage device and the distance to the charging location. This preliminary determination ensures that the driving behavior is pre-adjusted to achieve optimal battery temperature conditions before charging begins, thereby maximizing charging power and minimizing charging time.
Solution Approach 2:
The invention changes the driving operation parameters (such as maximum speed, acceleration, or power output) as a function of the energy storage device's temperature and distance to charging location. By dynamically adjusting these parameters, the system optimizes the thermal state of the battery to fall within the charging temperature range at the time of charging, thus improving charging efficiency.
2Duration of action of moving object
If driving operation parameters are restricted to extend range, then energy consumption is reduced and range is increased, but driving performance and speed are compromised
Solution Approach 1:
Instead of applying fixed restrictions to driving operation parameters, the invention dynamically adjusts the maximum values of these parameters based on real-time conditions including energy storage device temperature, distance to charging location, and current driving conditions. This dynamic approach allows the system to optimize the balance between range extension and driving performance, restricting parameters only when and where necessary to achieve optimal charging conditions.
3Ease of operation
If no temperature-based restrictions are applied, then driving freedom is maintained, but charging efficiency is reduced due to unfavorable battery temperatures
Solution Approach 1:
The control device continuously monitors the temperature of the energy storage device and uses this feedback to dynamically determine appropriate maximum values for driving operation parameters. This feedback mechanism allows the system to automatically adjust driving restrictions based on thermal conditions, ensuring optimal charging efficiency without requiring manual intervention from the driver, thereby maintaining driving freedom while improving charging performance.
Data Source
AI summary
A method for determining a maximum value for a parameter range of a driving operation parameter of a motor vehicle. The motor vehicle includes a control device, at least one electric traction motor, an electric energy storage device which can be operated in an operating temperature range for operating the traction motor, and at least one temperature sensor for determining a temperature of the energy storage device. The control device determines the maximum value as a function of a current temperature of the energy storage device determined by the temperature sensor in such a manner that, after the approach of a destination known to the control device and/or after a journey over a predetermined distance with the driving operation parameter restricted by the maximum value of the parameter range, a predicted temperature of the energy storage device lies within a charging temperature range.