Control device, energy conversion system, energy conversion method and storage medium

Patent metadata

Field	Value
Publication number	US-11296525-B2
Application number	US-202015733803-A
Country	US
Kind code	B2
Filing date	Jun 15, 2020
Priority date	Jun 15, 2020
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

The present disclosure provides a control device, an energy conversion system, an energy conversion method and a storage medium. The control device includes: a detection unit configured to detect a first voltage between a positive electrode of the energy storage device and a first end of an energy conversion device, a second voltage between a negative electrode of the energy storage device and a second end of the energy conversion device, and a third voltage between the positive electrode and the negative electrode of the energy storage device; a processing unit configured to calculate a resistance value corresponding to the energy conversion device according to the first voltage, the second voltage, and the third voltage; when the value of resistance is greater than a resistance threshold value, controlling the energy storage device to supply power to the electrical equipment through the energy conversion device.

First claim

What is claimed is:

1. A control device, comprising:
a detection unit configured to detect a first voltage between a positive electrode of the energy storage device and a first end of an energy conversion device, a second voltage between a negative electrode of the energy storage device and a second end of the energy conversion device, and a third voltage between the positive electrode and the negative electrode of the energy storage device; and
a processing unit configured to
calculate a resistance value corresponding to the energy conversion device according to the first voltage, the second voltage, and the third voltage; and
controlling the energy storage device to supply power to the electrical equipment through the energy conversion device in case that the value of resistance is greater than a resistance threshold value.

2. The control device according to claim 1 , wherein the processing unit is further configured to prohibit the energy storage device from providing power to an electrical equipment through the energy conversion device in case that the resistance value is less than or equal to the resistance threshold value.

3. A control device according to claim 1 , wherein the energy storage means is connected to the energy conversion device via a first connection line in which a switch assembly is arranged, and the processing unit is further configured to:
close the switch assembly to enable the first connection line to be in a closed state under the condition that the resistance value is greater than the resistance threshold value, and
disconnect the switch assembly so that the first connection line is in a disconnected state under the condition that the resistance value is less than or equal to the resistance threshold value.

4. The control device according to claim 3 , wherein:
the detection unit comprises a fault detection circuit connected to the first connecting line, and the first connecting line and the fault detection circuit form a connection circuit between the energy storage device and the energy conversion device in case that the first connecting line is in a disconnected state; and
the processing unit is further configured to calculate the resistance value from the first voltage, the second voltage, and the third voltage detected by the fault detection circuit and resistance information of the fault detection circuit.

5. The control device according to claim 4 , wherein:
the first connecting line comprises a first line for connecting the positive electrode of the energy storage device and the first end of the energy conversion device, and a second line for connecting the negative electrode of the energy storage device and the second end of the energy conversion device;
the switch assembly comprises a first switch unit and a second switch unit which are respectively arranged on the first circuit and the second circuit; and
the fault detection circuit comprises a first sampling circuit, a second sampling circuit and a third sampling circuit, which are respectively connected with the first line and the second line, and respectively detect a first voltage, a second voltage and a third voltage in case that the first switching unit and the second switching unit are in a disconnected state.

6. The control device according to claim 5 , wherein:
a connection point of the first end of the first sampling circuit and the first line is located between the first switch unit and the energy conversion device, and a connection point of the second end of the first sampling circuit and the second line is located between the second switch unit and the energy storage device, the first sampling circuit is configured to acquire a first sampling voltage through a first sampling point provided in the first sampling circuit;
the connection point of the first end of the second sampling circuit and the first line is positioned between the first switch unit and the energy storage device, and the connection point of the second end of the second sampling circuit and the second line is positioned between the second switch unit and the energy conversion device, the second sampling circuit is configured to collect a second sampling voltage through a second sampling point provided in the second sampling circuit;
the connection point of the first end of the third sampling circuit and the first line is positioned between the first switch unit and the energy storage device, and the connection point of the second end of the third sampling circuit and the second line is positioned between the second switch unit and the energy storage device, the third sampling circuit is configured to collect a third sampling voltage through a third sampling point provided in the third sampling circuit; and
the processing unit is further configured to calculate a first voltage based on the first sampled voltage and resistance information of the first sampling circuit, calculate a second voltage based on the second sampled voltage and resistance information of the second sampling circuit, and calculate a third voltage based on the third sampled voltage and resistance information of the third sampling circuit.

7. The control device according to claim 3 , further comprising:
a first current collecting circuit configured to collect a first detected current value corresponding to a current transmitted through the first connection line,
wherein the processing unit is further configured to acquire a first detected current value, a second detected current value corresponding to a current of the input or output energy conversion device after the control switch assembly is closed, and control the switch component to be in a closed state under the condition that the absolute value of the difference between the first detected current value and the second detected current value is smaller than a preset current difference value threshold value.

8. An energy conversion system, comprising:
an energy conversion device, an energy storage means and a control device according to claim 1 .

9. The energy conversion system according to claim 8 , wherein the energy conversion device comprises:
a second current collecting unit configured to collect a second detected current value corresponding to a current of the input or output energy conversion device; and
a communication module configured to transmit the second detected current value to a processing unit of the control device.

10. The energy conversion system according to claim 8 , wherein the energy conversion device comprises:
a second connecting line configured to receive the electric energy input by the energy storage device or output the electric energy to the energy storage device;
an auxiliary power supply module; and
a current limiting circuit arranged in the second connecting circuit and configured to limit the current transmitted from the second connecting circuit, so that the limited current input into the auxiliary power supply module to supply power for the energy conversion device.

11. The energy conversion system of claim 10 , wherein the current limiting circuit comprises:
a current limiting resistor; and
a third switching unit connected with the current limiting resistor in parallel, and be closed by the energy conversion device to carry out short circuit on the current limiting resistor in case that the energy conversion device is in a working state.

12. An energy conversion method applied to an energy conversion system, the energy conversion system comprising: an energy conversion device, an energy storage device and a control device, wherein the control device comprises a detection unit and a processing unit; the detection unit is used

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Li Meng
• Dan Zhimin
• Hou Yizhen

Classifications

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J7/40

  characterised by the exchange of charge or discharge related data · CPC title

• H02J7/80 Primary

  including monitoring or indicating arrangements · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/855 Primary

  with circuits adapted for supplying loads from the battery · CPC title