EV Battery Thermal Circuit with Insulated Auxiliary Loop
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Solution Overview
Problem
Electric vehicle batteries face challenges in temperature control due to high temperature fluctuations, requiring efficient heating and cooling systems that minimize energy losses and optimize battery performance for range and standby times.
Innovation Solution
A heating or cooling circuit with a base circuit for the electric motor and battery, featuring a bypass line and a thermally insulated auxiliary circuit that allows independent temperature control of the battery, using a smaller auxiliary pump to reduce energy consumption and parasitic losses, and utilizing waste heat from the electric motor for battery tempering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the main pump in the base circuit is used to temperature control the battery, then the battery can be temperature controlled, but parasitic energy losses are too high and charging time is extended
Solution Approach 1:
The temperature control system is segmented into a base circuit for the electric motor and a separate auxiliary circuit for the battery. This allows independent temperature control of the battery using a dedicated auxiliary pump, avoiding the high parasitic losses of the main pump while enabling simultaneous operation without extending charging time
2Loss of energy
If the electric motor is used for waste heat to temperature control the battery, then energy efficiency is improved, but the battery cannot be temperature controlled independently when the electric motor is stationary or off
Solution Approach 1:
The system is divided into a base circuit that可以利用 waste heat from the electric motor and a separate auxiliary circuit that can operate independently. When the motor is running, the base circuit provides efficient waste heat utilization. When the motor is stationary or off, the auxiliary circuit with its dedicated pump and heater ensures the battery can still be temperature controlled independently
Solution Approach 2:
The auxiliary circuit acts as an intermediary system that bridges the gap between waste heat availability and battery temperature control needs. It provides backup heating capability through a dedicated heater when waste heat is unavailable, ensuring continuous independent temperature control capability
3Reliability
If the main pump operates to temperature control both electric motor and battery together, then both components are cooled, but energy consumption increases and battery temperature control efficiency decreases
Solution Approach 1:
The temperature control function is segmented between the base circuit for the electric motor and the auxiliary circuit for the battery. The auxiliary pump in the auxiliary circuit consumes significantly less energy than the main pump, enabling reliable battery temperature control with reduced energy consumption
Solution Approach 2:
The auxiliary circuit provides dedicated battery temperature control with partial action - it only operates when battery temperature control is needed, not continuously like the main pump. This reduces overall energy consumption while maintaining reliable temperature control when required
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 enables efficient temperature control of the battery independently of the electric motor, reducing energy losses and enhancing battery performance by allowing autonomous temperature management, which increases efficiency and reduces charging time, while also utilizing waste heat for cabin heating.
Implementation Method 1
The auxiliary circuit includes means, for example in the form of a pump, that enable the flow of coolant through the auxiliary circuit independently of the main pump in the main circuit
Implementation Method 2
The auxiliary circuit is thermally insulated from the main circuit. Thermally insulated means that the auxiliary circuit can be operated independently of the main circuit without exchanging heat with the main circuit
Implementation Method 3
a main pump is provided in the base circuit to transport a coolant through the base circuit
Implementation Method 4
a bypass line to allow the coolant to flow past the battery
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a heating or cooling medium circuit (100) for an electric vehicle, comprising a base circuit (10) for controlling the temperature of an electric motor (11) and a battery (12) of the electric vehicle, wherein a main pump (15) is provided in the base circuit (10) in order to pump a coolant through the base circuit (10), a bypass line (20) for allowing the coolant to flow past the battery (12), and a thermally insulated auxiliary circuit (30) for the battery (12) in order to control the temperature of the battery (12) independently of the electric motor (11).