CN-115107577-B - Control circuit of battery thermal management unit and new energy electric vehicle

CN115107577BCN 115107577 BCN115107577 BCN 115107577BCN-115107577-B

Abstract

The invention discloses a control circuit of a battery thermal management unit and a new energy electric vehicle. The control circuit comprises a pre-charging circuit module, a voltage reducing module and a TMS controller, wherein the pre-charging circuit module is connected with a first whole vehicle power supply circuit and used for carrying out buffer treatment on an accessed first whole vehicle voltage, the voltage reducing module is connected with the pre-charging circuit module and used for carrying out voltage reducing treatment on the first whole vehicle voltage after buffer treatment, the first whole vehicle voltage after voltage reducing treatment is used for providing electric energy for a circuit component of a non-TMS controller, the TMS controller is connected with the voltage reducing module and used for controlling the temperature of a vehicle battery and controlling the circuit component of the non-TMS controller to work, the TMS controller is connected with a second whole vehicle power supply circuit and used for providing electric energy for the TMS controller by adopting the second whole vehicle voltage accessed by the second whole vehicle power supply circuit, and the voltage value of the second whole vehicle voltage is lower than the first whole vehicle voltage.

Inventors

DONG SHENGHAI
QIAN CHENG

Assignees

盾安汽车热管理科技有限公司

Dates

Publication Date: 20260508
Application Date: 20210322

Claims (7)

1. A control circuit of a battery thermal management unit, wherein the control circuit adopts two lines to provide electric energy for the battery thermal management unit, the control circuit comprising: The pre-charging circuit module is connected with the whole vehicle power supply circuit I and used for buffering the accessed whole vehicle voltage I, and comprises a high-voltage pre-charging circuit, a high-voltage filter and a high-voltage filter, wherein the high-voltage pre-charging circuit is connected with the whole vehicle power supply circuit I and used for buffering the accessed whole vehicle voltage I; the voltage reducing module is connected with the pre-charging circuit module and used for reducing the voltage of the whole vehicle after buffer treatment, wherein the voltage of the whole vehicle after voltage reduction treatment is used for providing electric energy for a non-TMS controller circuit component, and the non-TMS controller circuit component comprises a compressor, an electronic water pump and a fan; The TMS controller is connected with the voltage reduction module and is used for controlling the temperature of a vehicle battery and controlling the circuit components of the non-TMS controller to work, wherein the TMS controller is connected with a whole vehicle power supply circuit II, a whole vehicle voltage II connected with the whole vehicle power supply circuit II is adopted for providing electric energy for the TMS controller, and the voltage value of the whole vehicle voltage II is lower than that of the whole vehicle voltage I; The non-TMS controller circuit component further comprises a wireless module, a pre-charging circuit module, a voltage reducing module and a wireless module, wherein the wireless module is used for providing a wireless control channel for the battery thermal management unit and communicating with the TMS controller through a preset serial port channel; The control circuit further comprises a BMS controller, wherein the TMS controller is connected with the BMS controller, receives a control signal sent by the BMS controller and communicates with the BMS controller, and the control signal comprises an upper high voltage signal, a battery cooling signal, a self-circulation signal and a shutdown signal; and under the condition that the TMS controller receives a battery temperature control signal given by the BMS controller, the battery temperature of the new energy vehicle is regulated.
2. The control circuit of claim 1, wherein the high voltage precharge circuit comprises: the high-voltage safety module is connected with the positive electrode of the whole vehicle power supply circuit I; the positive relay is connected with the high-voltage safety module; the negative relay is connected with a negative electrode of the whole vehicle power supply circuit I; The pre-charging relay is connected with the high-voltage safety module; and the pre-charging resistor is connected with the pre-charging relay.
3. The control circuit of claim 2, wherein the high voltage precharge circuit further comprises: And the pre-charging capacitor is respectively connected with the positive relay, the negative relay and the pre-charging resistor.
4. A control circuit according to claim 3, wherein the high voltage filter comprises: A first capacitor connected in parallel with the precharge capacitor; A second capacitor connected in series with the first capacitor; a common mode inductor connected in parallel with the precharge capacitor; the third capacitor is connected with the common mode inductor; A fourth capacitor connected in series with the third capacitor, Wherein the second capacitor and the fourth capacitor are grounded.
5. The control circuit of claim 1, wherein the non-TMS controller circuit component comprises: the compressor is connected with the TMS controller, and provides a refrigeration source for the battery thermal management unit after the TMS controller receives the battery cooling signal; the electronic water pump is connected with the TMS controller and used for circularly regulating and controlling the antifreezing solution used in the working process of the vehicle; and the fan is connected with the TMS controller and provides condensation wind for the refrigerating process of the compressor.
6. The control circuit of claim 5, wherein the compressor is further coupled to the precharge circuit module to switch in the vehicle voltage one.
7. A new energy electric vehicle, characterized by comprising the control circuit of the battery thermal management unit according to any one of claims 1 to 6.

Description

Control circuit of battery thermal management unit and new energy electric vehicle Technical Field The invention relates to the technical field of new energy vehicles, in particular to a control circuit of a battery thermal management unit and a new energy electric vehicle. Background In the related art, the cooling of the power battery of the existing pure electric vehicle, heavy truck and light truck basically adopts an external power battery thermal management system (TMS controller for short), and currently, because the TMS controller low-voltage 24V load equipment such as an electronic water pump, a fan and a compressor is high-power motor inductive equipment, the high-power motor inductive equipment easily causes great interference to the low-voltage 24V, and the communication state and the normal operation of the TMS controller and the BMS controller are influenced. In view of the above problems, no effective solution has been proposed at present. Disclosure of Invention The embodiment of the invention provides a control circuit of a battery thermal management unit and a new energy electric vehicle, which at least solve the technical problem that high-power motor inductive equipment in the related art easily causes great interference to low voltage 24V to influence normal communication of a TMS controller and a BMS controller. According to one aspect of the embodiment of the invention, a control circuit of a battery thermal management unit is provided, which comprises a pre-charging circuit module, a voltage reducing module and a TMS controller, wherein the pre-charging circuit module is connected with a first whole vehicle power supply circuit and is used for carrying out buffer treatment on an accessed first whole vehicle voltage, the voltage reducing module is connected with the pre-charging circuit module and is used for carrying out voltage reduction treatment on the first whole vehicle voltage after the buffer treatment, the first whole vehicle voltage after the voltage reduction treatment is used for providing electric energy for a circuit component of a non-TMS controller, and the TMS controller is connected with the voltage reducing module and is used for controlling the temperature of a vehicle battery and controlling the circuit component of the non-TMS controller to work, the TMS controller is connected with a second whole vehicle power supply circuit and is used for providing electric energy for the TMS controller by adopting the second whole vehicle voltage accessed by the second whole vehicle power supply circuit, and the voltage value of the second whole vehicle voltage is lower than the first whole vehicle voltage. Optionally, the pre-charging circuit module comprises a high-voltage pre-charging circuit connected with the whole vehicle power supply circuit I and used for buffering the accessed whole vehicle voltage I, and a high-voltage filter connected with the high-voltage pre-charging circuit and used for filtering interference signals of the whole vehicle power supply circuit I. Optionally, the high-voltage pre-charging circuit comprises a high-voltage safety module, a positive relay, a negative relay, a pre-charging relay and a pre-charging resistor, wherein the high-voltage safety module is connected with a positive electrode of the whole vehicle power supply circuit I, the positive relay is connected with the high-voltage safety module, the negative relay is connected with a negative electrode of the whole vehicle power supply circuit I, the pre-charging relay is connected with the high-voltage safety module, and the pre-charging resistor is connected with the pre-charging relay. Optionally, the high-voltage pre-charging circuit further comprises a pre-charging capacitor which is respectively connected with the positive relay, the negative relay and the pre-charging resistor. Optionally, the high-voltage filter comprises a first capacitor, a second capacitor, a common-mode inductor, a third capacitor and a fourth capacitor, wherein the first capacitor is connected with the pre-charge capacitor in parallel, the second capacitor is connected with the first capacitor in series, the common-mode inductor is connected with the pre-charge capacitor in parallel, the third capacitor is connected with the common-mode inductor, the fourth capacitor is connected with the third capacitor in series, and the second capacitor and the fourth capacitor are grounded. Optionally, the TMS controller is connected with the BMS controller, receives a control signal sent by the BMS controller and communicates with the BMS controller, wherein the control signal comprises at least one of an upper high voltage signal, a battery cooling signal, a self-circulation signal and a shutdown signal. Optionally, the non-TMS controller circuit component comprises a compressor, an electronic water pump and a fan, wherein the compressor is connected with the TMS controller, a refrigeration source is provided for a b