EV Thermal Management Series-Parallel Circuit for Cabin Heating
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Solution Overview
Problem
Electric vehicles face reduced endurance mileage due to battery energy consumption from air conditioning systems, which rely on the battery as both power source and heat source for cabin temperature adjustment.
Innovation Solution
An electric vehicle thermal management system that connects a cooling circuit between the battery, electric motor, and radiator in series to absorb heat and dissipate it to the cabin, with a switching device to manage heat distribution and separate components as needed, allowing for efficient heat transfer and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery is used as the energy source for the air conditioning system to adjust cabin temperature, then the cabin temperature can be maintained within a comfortable range, but the battery energy consumption increases and the endurance mileage is reduced
Solution Approach 1:
The patent converts the waste heat generated by the battery and motor into a useful resource for cabin heating. Instead of dissipating this heat to the environment, the system captures it through the cooling circuit and redirects it to heat the cabin, thereby eliminating energy waste and reducing the need for additional heating energy consumption.
Solution Approach 2:
The cooling circuit is designed to serve multiple functions: it cools the battery and motor while simultaneously providing heat to the cabin through the radiator. This multi-functional design allows the same system to perform both cooling and heating operations, reducing the need for separate heating systems and minimizing energy consumption.
2Loss of energy
If the battery, electric motor and radiator are connected in series in the cooling circuit to absorb and dissipate heat, then heat transfer efficiency is improved, but the system complexity increases due to the switching device and multiple connection paths
Solution Approach 1:
The patent employs a switching device that dynamically reconfigures the cooling circuit based on operational requirements. The switching device can connect or disconnect different components (battery, motor, radiator) in series or parallel configurations, allowing the system to optimize heat transfer efficiency for different operating conditions while managing complexity through controlled adaptability.
Solution Approach 2:
The cooling circuit is divided into separate segments (first part path connecting battery to radiator, second part path connecting motor) that can be independently controlled and connected through the switching device. This segmentation allows flexible configuration to optimize heat transfer while simplifying control logic for each individual segment.
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 system effectively dissipates heat generated by components, transmitting it to the cabin while minimizing battery and motor heat dissipation interference, thus conserving electric power and enhancing vehicle endurance.
Implementation Method 1
cool the battery and/or the electric motor to absorb heat
Implementation Method 2
the first radiator may provide a heat source to the passenger cabin by dissipating the heat absorbed by the cooling liquid
Data Source
AI summary
Electric vehicle thermal management systems and electric vehicles using the thermal management system, are disclosed. A passenger cabin is heated by the heat dissipated from a battery and/or a motor. A cooling circuit in the management system fluidly connects the battery, the motor and a first radiator in series. The first radiator provides a heat source to the passenger cabin by means of the heat dissipated from the battery and/or the electric motor. Under certain conditions, the electric motor is selectively separated from the cooling circuit, so that when the passenger cabin needs to be heated, the thermal management system can provide heat to the passenger cabin without affecting the heat dissipation of the battery.