Portable Second Battery Switching for Cold-Start EV Power Saving
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Solution Overview
Problem
Battery electric vehicles often face high power consumption due to the need to warm up batteries at low temperatures during system startup.
Innovation Solution
The vehicle incorporates a detachable portable second battery and a control device that manages power connections between the first battery, second battery, and electric device, prioritizing the use of the second battery when its temperature is within an allowable range to reduce the need for battery warming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery is warmed up using the electric device at system startup, then the battery temperature increases to usable range, but power consumption increases significantly
Solution Approach 1:
The second battery is pre-charged and pre-heated outside the vehicle, so that when the vehicle starts, the battery is already at a usable temperature range, eliminating the need for warming up at startup and reducing power consumption
2Reliability
If the battery is warmed up frequently at low temperatures, then the battery can operate at usable temperature, but the frequency of warming up increases power consumption
Solution Approach 1:
The battery is pre-heated before installation in the vehicle, ensuring it is already at a usable temperature. This preliminary action prevents the need for frequent warming up operations, thereby maintaining reliability while reducing energy consumption
3Use of energy by moving object
If a detachable portable second battery is added to the system, then power consumption for warming up is reduced, but device complexity increases
Solution Approach 1:
The battery system is divided into two independent parts: a first battery for vehicle operation and a second portable battery for pre-charging and pre-heating. This segmentation allows the portable battery to be handled separately, reducing the warming up power consumption of the vehicle's main battery system
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 reduces power consumption for warming up the first battery by preferentially using the second battery at suitable temperatures, thereby improving the vehicle's energy efficiency and reducing startup time.
Implementation Method 1
a detachable portable second battery; a control device that controls the first and second connecting and disconnecting devices... in such a manner that the second battery is preferentially connected to the power line over the first battery when a temperature of the second battery is within an allowable temperature range
Implementation Method 2
the electric device is operated to warm up the battery by the heat generated by the internal resistance of the battery
Data Source
AI summary
A battery electric vehicle includes: a traction motor; an inverter driving the motor; a first battery; an electric device running on electric power from the first battery; a detachable portable second battery; a first connecting and disconnecting device connecting and disconnecting a power line connected to the inverter and the first battery to and from each other; a second connecting and disconnecting device connecting and disconnecting the power line and the second battery to and from each other; and a control device controlling the first connecting and disconnecting device and the second connecting and disconnecting device. When a system startup instruction is given, the control device controls the first and second connecting and disconnecting devices so that the second battery is preferentially connected to the power line over the first battery when a temperature of the second battery is within an allowable temperature range of the second battery.