Voltage regulation circuit and system for traction battery and control method thereof

Patent metadata

Field	Value
Publication number	US-12119697-B2
Application number	US-202418594808-A
Country	US
Kind code	B2
Filing date	Mar 4, 2024
Priority date	May 12, 2022
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A voltage regulation circuit for traction battery includes a traction battery, a heating module, a charge/discharge interface, and a voltage regulation module. The heating module includes a power storage element and a switch module. The traction battery is connected in parallel to the switch module. An external charging and discharging device is connected in parallel to the traction battery through the charge/discharge interface. The voltage regulation module includes a plurality of switches and a power storage regulation element, and the plurality of switches and the power storage regulation element are disposed between the charge/discharge interface and the traction battery. The voltage regulation module and the switch module are configured to regulate, in response to a voltage regulation control signal, a charge/discharge voltage between the traction battery and the power storage element and a charge voltage of the external charging and discharging device for the traction battery.

First claim

What is claimed is:

1. A voltage regulation circuit for traction battery, comprising:
a traction battery;
a heating module;
a charge/discharge interface; and
a voltage regulation module;

wherein
the heating module comprises a power storage element and a switch module;
the traction battery is connected in parallel to the switch module, and an external charging and discharging device is connected in parallel to the traction battery through the charge/discharge interface;
the voltage regulation module comprises a plurality of switches and a power storage regulation element, and the plurality of switches and the power storage regulation element are disposed between the charge/discharge interface and the traction battery; and
the voltage regulation module and the switch module are configured to regulate, in response to a voltage regulation control signal, a charge/discharge voltage between the traction battery and the power storage element and a charge voltage of the external charging and discharging device for the traction battery;

wherein
the voltage regulation module comprises a first switch, a second switch, a third switch, a fourth switch, and the power storage regulation element;
the first switch is disposed between the power storage element and the switch module;
the second switch is disposed between the power storage element and the charge/discharge interface;
the third switch and the fourth switch are respectively disposed on a negative electrode side and a positive electrode side of the charge/discharge interface; and
the power storage regulation element is disposed between the power storage element and the switch module and also between the power storage element and the charge/discharge interface;
wherein a fifth switch is provided on the positive electrode side of the traction battery, and a sixth switch is provided on the negative electrode side of the traction battery; and
wherein the fifth switch is connected in parallel to a branch, and the branch comprises a resistor and a seventh switch connected in series.

2. The voltage regulation circuit according to claim 1 , wherein
one terminal of the first switch is connected to the switch module, another terminal of the first switch is connected to a first terminal of the power storage regulation element, and a second terminal of the power storage regulation element is connected to the power storage element;
the first terminal of the power storage regulation element is also connected to one terminal of the second switch and the negative electrode side of the charge/discharge interface, and the other terminal of the second switch is connected to the positive electrode side of the charge/discharge interface;
the third switch is disposed between the negative electrode side of the charge/discharge interface and a negative electrode side of the traction battery; and
the fourth switch is disposed between the positive electrode side of the charge/discharge interface and a positive electrode side of the traction battery.

3. The voltage regulation circuit according to claim 2 , wherein
the switch module comprises a charge-discharge switching module and a leg set;
the charge-discharge switching module is connected in parallel to the leg set, a first terminal of the power storage element is connected to the leg set, a second terminal of the power storage element is connected to the second terminal of the power storage regulation element, the first terminal of the power storage regulation element is connected to one terminal of the first switch, and the other terminal of the first switch is connected to the charge-discharge switching module.

4. The voltage regulation circuit according to claim 3 , wherein a first capacitor is provided between the first terminal of the power storage regulation element and the negative electrode side of the charge/discharge interface.

5. The voltage regulation circuit according to claim 1 , wherein the power storage regulation element is an inductive element.

6. The voltage regulation circuit according to claim 1 , wherein
the switch module comprises a charge-discharge switching module and a leg set;
the charge-discharge switching module is connected in parallel to the leg set, a first terminal of the power storage element is connected to the leg set, and a second terminal of the power storage element is connected to the charge-discharge switching module.

7. The voltage regulation circuit according to claim 6 , wherein
the power storage element comprises an M-phase motor;
the leg set comprises M phase legs, M being a positive integer;
M phase windings of the M-phase motor are connected to joints between upper legs and lower legs of all of the M phase legs in one-to-one correspondence; and
the charge-discharge switching module comprises a first switching circuit and a second switching circuit connected in series, and a joint between the first switching circuit and the second switching circuit is connected to a neutral point of the M-phase motor.

8. The voltage regulation circuit according to claim 7 , wherein both the first switching circuit and the second switching circuit comprise a triode and a flyback diode connected in parallel.

9. The voltage regulation circuit according to claim 7 , wherein both the first switching circuit and the second switching circuit comprise a triode or a relay switch.

10. The voltage regulation circuit according to claim 7 , wherein
the first switching circuit comprises a diode and the second switching circuit comprises a switch; or
the first switching circuit comprises a switch and the second switching circuit comprises a diode.

11. The voltage regulation circuit according to claim 7 , wherein a switch and an inductor are provided between the joint between the first switching circuit and the second switching circuit and the neutral point of the M-phase motor.

12. The voltage regulation circuit according to claim 1 , wherein a second capacitor is connected in parallel to the traction battery.

13. An electric device, comprising:
a control module; and
the voltage regulation circuit according to claim 1 ;
wherein the control module is connected to the switch module and the voltage regulation module, and is configured to control the voltage regulation module and the switch module to regulate the charge/discharge voltage between the traction battery and the power storage element and the charge voltage of the external charging and discharging device for the traction battery.

14. A voltage regulation method for traction battery, applied to a voltage regulation system that comprises an external charging and discharging device and an electric device, the electric device comprising a control module and the voltage regulation circuit according to claim 1 ; wherein the method comprises:
obtaining an enabling signal from the control module; and
controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate a charge/discharge voltage between the traction battery and the power storage element; or
controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate a charge voltage of the external charging and discharging device for the traction battery.

15. The voltage regulation method according to claim 14 , wherein controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate the charge/discharge voltage between the traction battery and the power storage element comprises:
controlling the voltage regulation module and the s

Assignees

• Contemporary Amperex Technology Co Ltd
• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Zhao Yuanmiao
• Dan Zhimin
• Yan Yu
• Li Zhanliang
• Huang Xiaojian
• Chen Xinwei

Classifications

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title

• H02J7/933 Primary

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J2105/37

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

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/90 Primary

  Regulation of charging or discharging current or voltage · CPC title