EV Battery Temperature Control for Cabin Heating Under Variable Load
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Solution Overview
Problem
Existing electrified vehicles face challenges in effectively utilizing battery exhaust heat for cabin heating while preventing battery deterioration, particularly during varying load conditions and environmental factors.
Innovation Solution
A control device in the electrified vehicle selectively adjusts the target battery temperature based on different traveling modes and environmental conditions to optimize cooling and heating, using a higher target temperature during normal mode when cabin heating is required and ensuring sufficient cooling capacity is available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling system maintains a low target battery temperature to prevent deterioration, then battery reliability is improved, but the exhaust heat available for cabin heating is reduced
Solution Approach 1:
The patent applies dynamics by making the target battery temperature adjustable based on operating conditions. The control device dynamically sets different target temperatures (first target temperature during high load traveling mode, second target temperature during normal traveling mode) according to the traveling mode and heating demand, optimizing both battery protection and heat utilization.
Solution Approach 2:
The patent changes the temperature parameter of the battery based on different traveling modes. By switching between first target temperature (lower) and second target temperature (higher), the system adapts the battery operating temperature to balance deterioration prevention and heating efficiency requirements.
2Power
If the cooling system is designed with maximum cooling capacity based on high load traveling mode, then battery cooling capability is improved, but the system complexity increases
Solution Approach 1:
The patent applies self-service by using the battery's own exhaust heat to warm the cabin during normal traveling mode. The control device determines whether to utilize exhaust heat based on the traveling mode and heating demand, allowing the battery thermal management system to serve dual purposes (cooling when needed, heating when possible) without requiring separate heating equipment.
3Productivity
If the target battery temperature is raised to improve cabin heating efficiency, then heating effectiveness is improved, but battery deterioration risk increases
Solution Approach 1:
The system dynamically adjusts the target battery temperature based on the traveling mode. During high load traveling mode, the first target temperature (lower) is set to prevent deterioration. During normal traveling mode with heating demand, the second target temperature (higher) is set to improve heating efficiency, as the cooling capacity margin allows safe temperature elevation.
Solution Approach 2:
The patent changes the target temperature parameter based on operating conditions. The control device switches between first target temperature and second target temperature according to traveling mode and heating demand, optimizing the balance between heating efficiency and battery protection.
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 effectively utilizes battery exhaust heat for cabin heating while preventing battery deterioration by maintaining the battery temperature below the threshold, even under high load conditions and varying environmental factors.
Implementation Method 1
a cooling system configured to cool the battery unit based on a target battery temperature under instruction
Implementation Method 2
the vehicle cabin is heated by utilizing exhaust heat of the battery unit
Data Source
AI summary
Electrified vehicle includes a battery unit, a cooling system that cools the battery unit according to the instructed target battery temperature, an air conditioner that controls the temperature in the vehicle cabin, and a control device that can selectively execute the plurality of driving modes. The plurality of traveling modes includes a normal traveling mode and a high-load traveling mode in which a traveling load is higher than that in a case where the normal traveling mode is executed. In a state in which heating in the vehicle cabin is required, the control device (a) instructs the cooling system to set a first target temperature as a target battery temperature when the high-load running mode is executed, and (b) instructs the cooling system to set a second target temperature higher than the first target temperature as a target battery temperature when the normal running mode is executed.