EV Battery Heating via External Power Notification
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Solution Overview
Problem
Electrically driven vehicles face performance deterioration due to battery output decline in low temperatures, as existing systems require significant time to heat the battery, leading to power saving controls that reduce traveling performance.
Innovation Solution
An electrically driven vehicle system that includes a notification system to prompt users to connect an external power source when the battery temperature falls below a predetermined level, allowing for simultaneous charging and heating of the battery, ensuring the battery is at a desired temperature for immediate start-up in low-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery is heated by the heater after start-up in low-temperature conditions, then the battery temperature reaches the desired level, but a considerable time is required and power saving control must be executed during this period
Solution Approach 1:
The notification system prompts the user to connect the external power source before the vehicle is actually started or before the battery temperature drops below the threshold. This preliminary notification allows the heating process to begin in advance, so that when the vehicle starts, the battery is already at the desired temperature, eliminating the time loss during operation.
2Reliability
If power saving control is executed to suppress battery output during heating, then the battery is protected, but traveling performance deteriorates
Solution Approach 1:
By notifying the user in advance to connect the external power source, the battery heating and charging process begins before the vehicle needs to operate. This ensures the battery is fully charged and at optimal temperature before travel begins, eliminating the need for power saving control during actual use and maintaining full traveling performance.
3Temperature
If the battery is heated using the onboard heater, then the battery temperature increases, but the heating process takes considerable time
Solution Approach 1:
The external power source acts as an intermediary device that provides both charging current and heating capability. By using this external device instead of the onboard heater, the battery can be heated and charged simultaneously at a much faster rate, dramatically improving heating efficiency without requiring the vehicle's own power systems.
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 the electric vehicle to start and travel without suppressing battery output immediately after start-up, even in low-temperature conditions, by ensuring the battery is heated and charged proactively, thus improving performance and reducing the need for power-saving controls.
Implementation Method 1
a battery heater unit 24 that heats the storage battery 2
Implementation Method 2
a charging device 5 that charges the storage battery 2 with power supplied from the external power source 80
Data Source
AI summary
An electrically driven vehicle and a notification system therefor are provided. The electrically driven vehicle includes a high-voltage battery and an inlet, a charging connector of an external power source is connected to the inlet, and power can be supplied from the external power source to the high-voltage battery. The electrically driven vehicle includes a battery heater unit heating the high-voltage battery by using power supplied from the external power source; and a charging ECU detecting an alighting preparing operation of a user, acquiring an environmental temperature at a time of detection in accordance with detection of the alighting preparing operation, and causing a meter panel to display a message prompting a driver to connect the charging connector to the inlet when the acquired environmental temperature is equal to or lower than an output decline temperature set for the high-voltage battery.