Battery Preheating Temperature Control Using SOC and Ambient Sensing
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Solution Overview
Problem
Conventional battery charging technologies face challenges in efficiently reducing charging time without exposing batteries to high temperatures for extended periods, which can lead to deterioration and increased risks of ignition due to lithium plating and electrolyte reactions.
Innovation Solution
A vehicle system that adjusts preheating temperatures based on the state of charge and outside temperature, using a controller and battery thermostat to maintain temperatures within a safe range, thereby optimizing charging efficiency and preventing battery degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery is charged with a charging current of a certain level or higher at a low temperature, then fast charging is achieved, but lithium plating and electrolyte reaction byproducts are generated causing battery deterioration
Solution Approach 1:
The system performs preliminary heating of the battery before charging to raise the battery temperature to an optimal range. The controller activates the heater in advance to preheat the battery, ensuring the battery is at the correct temperature before fast charging begins, thereby preventing lithium plating and electrolyte decomposition
Solution Approach 2:
The system dynamically adjusts the preheating temperature based on the state of charge (SOC) of the battery. The controller determines different preheating temperature targets according to SOC levels, optimizing the battery temperature to enable fast charging while preventing harmful reactions and deterioration
2Productivity
If the battery is exposed to high temperatures for extended periods, then charging time is reduced, but battery deterioration and ignition risk increase
Solution Approach 1:
The controller adjusts the preheating temperature parameter based on the battery's state of charge. By dynamically changing the target temperature according to SOC levels, the system achieves optimal charging speed while preventing excessive temperature exposure that would cause battery deterioration or ignition
Solution Approach 2:
The system continuously monitors battery temperature and state of charge, using this feedback to adjust the preheating temperature and charging parameters in real-time. This closed-loop control ensures the battery operates within safe temperature ranges while maximizing charging efficiency
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 allows for faster battery charging while preventing overheating, reducing the risk of battery deterioration and ignition, thus enhancing safety and performance.
Implementation Method 1
a battery thermostat; a controller configured to determine a preheating temperature of the battery based on an outside temperature of the vehicle and a first state of charge of the battery, and control the battery thermostat based on the preheating temperature
Data Source
AI summary
A vehicle includes: a battery; a battery thermostat; at least one sensor; and a controller configured to determine a preheating temperature of the battery based on an outside temperature of the vehicle and a first state of charge of the battery, and control the battery thermostat based on the preheating temperature, the first state of charge being identified through the at least one sensor.