Temperature rise control device and temperature rise control method

Abstract

The present invention provides a temperature control device and a temperature control method that can suppress the risk of Li deposition due to the current supplied for ripple heating. [Solution] The temperature rise control device 10 according to the present disclosure comprises a three-phase inverter 30 driven by the power of a lithium-ion secondary battery 20, a control unit 14 that raises the temperature of the lithium-ion secondary battery 20 by supplying a current IA generated by the three-phase inverter 30 to the lithium-ion secondary battery 20, a high-frequency signal supply unit 11 that supplies a high-frequency signal with a frequency of 0.1 MHz or higher to the lithium-ion secondary battery 20, a detection unit 12 that detects the real value of the AC impedance from the lithium-ion secondary battery 20 to which the high-frequency signal has been supplied, and a calculation unit 13 that calculates the amount of Li deposited in the lithium-ion secondary battery 20 from the detected real value of the AC impedance.

Claims

1. A three-phase inverter powered by a lithium-ion secondary battery, A control unit that raises the temperature of the lithium-ion secondary battery by supplying the current generated by the three-phase inverter to the lithium-ion secondary battery, A high-frequency signal supply unit that supplies a high-frequency signal with a frequency of 0.1 MHz or higher to the lithium-ion secondary battery, A detection unit that detects the real part value of the AC impedance from a lithium-ion secondary battery to which the aforementioned high-frequency signal is supplied, The system includes a calculation unit that calculates the amount of Li deposited in the lithium-ion secondary battery from the real value of the detected AC impedance, The control unit controls the current generated by the three-phase inverter so as the calculated amount of Li deposition increases, in order to suppress the temperature rise of the lithium-ion secondary battery. Temperature control device.

2. The high-frequency signal supply unit supplies the high-frequency signal of 0.5 MHz or higher to the lithium-ion secondary battery. The temperature control device according to claim 1.

3. The current generated by the three-phase inverter includes a charging current component and a ripple current component. The control unit controls the current generated by the three-phase inverter by increasing the frequency of the ripple current component. The temperature control device according to claim 1 or 2.

4. The current generated by the three-phase inverter includes a charging current component and a ripple current component. The control unit controls the current generated by the three-phase inverter by reducing the amplitude of the ripple current component. The temperature control device according to claim 1 or 2.

5. The current generated by the three-phase inverter includes a charging current component and a ripple current component. The control unit controls the current generated by the three-phase inverter by suppressing the supply of the ripple current component. The temperature control device according to claim 1 or 2.

6. A process for driving a three-phase inverter with power from a lithium-ion secondary battery, The process involves supplying the current generated by the three-phase inverter to the lithium-ion secondary battery to raise the temperature of the lithium-ion secondary battery, A step of supplying a high-frequency signal with a frequency of 0.1 MHz or higher to the lithium-ion secondary battery, The process of detecting the real part value of the AC impedance from the lithium-ion secondary battery to which the high-frequency signal is supplied, The process includes a step of calculating the amount of Li deposited in the lithium-ion secondary battery from the real value of the detected AC impedance, In the process of raising the temperature of the lithium-ion secondary battery, As the calculated amount of Li deposited increases, the current generated by the three-phase inverter is controlled to suppress the temperature rise of the lithium-ion secondary battery. Temperature control method.

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