Power Consumption Control for Plug-in Electric Vehicle Battery Heating
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Solution Overview
Problem
Plug-in electric motor vehicles face inefficiencies in power consumption when heating storage batteries, both when charging and discharging, as existing systems consume power unnecessarily, reducing battery performance, especially at low temperatures.
Innovation Solution
A power consumption control device that includes a storage battery, a heating unit, a power conversion unit, an effective capacity estimation unit, and controllers to optimize power usage by heating the battery only when necessary to improve performance, using external power efficiently and reducing wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage battery is heated using power from external power supply or storage battery, then the performance of the storage battery is improved, but unnecessary power consumption occurs when heating does not increase effective capacity
Solution Approach 1:
The system uses an effective capacity estimation unit to calculate the effective capacity of the storage battery before and after heating, and a current flow controller to determine whether to supply current to the heating unit based on whether the effective capacity increases. This feedback mechanism ensures power is only consumed when heating actually improves battery performance.
Solution Approach 2:
The system automatically determines whether heating is necessary by estimating effective capacity changes, and autonomously controls power supply to the heating unit without requiring external intervention. The battery management system self-regulates power consumption based on actual battery needs.
2Reliability
If the storage battery is heated before charging or discharging, then the effective capacity increases, but power is consumed even when effective capacity does not increase
Solution Approach 1:
The effective capacity estimation unit provides feedback on whether heating will actually increase effective capacity. The current flow controller uses this feedback to decide whether to activate the heating unit, preventing energy waste when heating would be ineffective.
Solution Approach 2:
Instead of always heating the storage battery, the system applies heating only partially - specifically when the effective capacity estimation indicates that heating will result in an increase in effective capacity. This avoids excessive action and associated energy waste.
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
The device efficiently consumes power to heat the storage battery, improving its performance by heating it only when effective capacity is expected to increase, thereby reducing unnecessary power consumption and enhancing battery efficiency.
Implementation Method 1
a heating unit configured to heat the storage battery using heat generated through current flowing
Data Source
AI summary
A power consumption control device includes: a storage battery configured to supply power to an electric motor of a plug-in electric motor vehicle; a heating unit configured to heat the storage battery using heat generated through current flowing; a power conversion unit configured to convert power supplied from an external power supply; an estimation unit configured to estimate a change in effective capacity of the storage battery when the heating unit generates heat through current flowing by the power supplied from the external power supply and raises the temperature of the storage battery to a target temperature, based on an effective capacity corresponding to the temperature and SOC of the storage battery; and a controller configured to control usage of the power converted by the power conversion unit according to the change of the effective capacity, estimated by the estimation unit.