AC Capacitor Switching for Secondary Battery Preheating
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Solution Overview
Problem
Conventional temperature raising devices for secondary batteries in electric vehicles are inefficient in raising the temperature of the batteries effectively.
Innovation Solution
A temperature raising device utilizing an AC generation circuit with capacitors and switch units, controlled by a controller to alternately switch between parallel and series connections, generating AC current based on stored electric power to efficiently raise battery temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional temperature raising devices are used for secondary batteries, then the temperature can be raised, but the energy efficiency is poor and the temperature raising is not efficient
Solution Approach 1:
The patent applies periodic action by generating AC current with alternating polarity to flow through the secondary battery. The controller alternately switches the parallel and series connection states of capacitors with the power storage, creating periodic current flow that efficiently raises battery temperature. This periodic AC current generation improves temperature raising efficiency compared to conventional DC-based methods while reducing energy loss.
2Temperature
If conventional temperature raising devices are used for secondary batteries, then the temperature can be raised, but the device complexity increases without sufficient efficiency improvement
Solution Approach 1:
The patent achieves multi-functionality by using the same capacitor network to perform both temperature raising and voltage regulation functions. The parallel and series switch units control capacitors that serve dual purposes: generating AC current for heating while also managing voltage levels. This universal approach raises battery temperature efficiently without requiring separate complex heating circuits, thereby limiting device complexity.
3Loss of energy
If AC current is generated by alternately switching parallel and series connection states of capacitors, then energy efficiency is improved, but the control complexity increases
Solution Approach 1:
The patent implements feedback control by having the controller monitor the connection states and automatically switch between parallel and series configurations of capacitors. The controller receives feedback on the current state and adjusts the switching to maintain optimal AC current generation. This automated feedback mechanism achieves improved energy efficiency through precise control while the system self-regulates, effectively managing control complexity.
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
Improves energy efficiency by efficiently raising the temperature of secondary batteries, thereby limiting deterioration of charging/discharging performance.
Implementation Method 1
a power storage having an inductance component
Implementation Method 2
the temperature of the secondary battery is raised by positively generating a ripple current of a prescribed frequency
Data Source
AI summary
A temperature raising device includes an alternating current (AC) generation circuit including a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor to the power storage in parallel, and a series switch unit configured to connect the first capacitor and the second capacitor to the power storage in series, and a controller configured to alternately switch the state between a first state in which the parallel switch unit is in a conductive state and the series switch unit is in a non-conductive state and a second state in which the parallel switch unit is in the non-conductive state and the series switch unit is in the conductive state.