Dual-Battery Conditioning for Cold EV Main Battery Protection
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Solution Overview
Problem
Eco-friendly vehicles equipped with high-voltage batteries face performance deterioration and reduced driving distance due to temperature-related issues, as energy from the main battery is consumed to increase its temperature, and low-temperature operation reduces battery efficiency and state of health.
Innovation Solution
A battery management system utilizing a dual battery system, where the temperature of the main battery is increased using energy from a replaceable sub-battery and regenerative energy, without consuming charged energy from the main battery, thereby preventing discharge in low-temperature states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the main battery is used to increase its own temperature, then the battery temperature is improved, but the driving distance is reduced due to energy consumption
Solution Approach 1:
The battery system is divided into a main battery and a sub-battery, allowing the sub-battery to specifically handle temperature conditioning functions while the main battery focuses on power delivery and energy storage, thus resolving the contradiction between temperature management and energy conservation
Solution Approach 2:
The sub-battery acts as an intermediary component that mediates between the need for temperature conditioning and the need to preserve main battery energy, enabling the main battery to maintain optimal temperature without directly consuming its own charged energy
2Productivity
If the main battery is discharged in low-temperature state, then the vehicle can be driven, but the battery efficiency and state of health are reduced
Solution Approach 1:
The system performs preliminary temperature conditioning of the main battery using the sub-battery and regenerative energy before the main battery is discharged in cold conditions, ensuring the battery reaches optimal operating temperature in advance, thus preventing efficiency loss and SOH degradation during discharge operations
3Loss of energy
If regenerative braking is used to charge the main battery, then energy is recovered, but the main battery temperature may decrease in cold conditions
Solution Approach 1:
The sub-battery serves as an intermediary that absorbs the thermal effects of regenerative charging, allowing the main battery to recover energy through regenerative braking without experiencing significant temperature drops that would harm its performance in cold conditions
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 solution effectively increases the main battery's temperature without consuming its energy, thereby extending the battery's lifetime, increasing the vehicle's drivable distance, and enhancing battery efficiency and state of health.
Implementation Method 1
power generation through the motor is performed
Implementation Method 2
the second battery is discharged when a motor is driven
Data Source
AI summary
In an embodiment, an eco-friendly vehicle battery conditioning method or system includes, in a vehicle driven by first and second batteries, if an entrance condition for a regenerative conditioning mode is satisfied, comparing a temperature of the first battery with a target temperature, and driving the vehicle by using a regenerative conditioning mode if the temperature of the first battery is lower than the target temperature, where the regenerative conditioning mode corresponds to a mode in which the second battery is discharged while a motor is driven and the first battery is charged while power generation through the motor is performed.