CN-121989697-A - Battery system of vehicle and control method thereof

CN121989697ACN 121989697 ACN121989697 ACN 121989697ACN-121989697-A

Abstract

The application provides a battery system of a vehicle and a control method thereof, wherein the battery system comprises a high-voltage connector, a detection module and a control module, the high-voltage connector comprises a connector plug and a connector socket, a displacement sensor assembly and a humidity sensor assembly are arranged on the connector plug, after the connector plug and the connector socket are oppositely plugged, the high-voltage power terminal and an interlocking signal terminal can be plugged, the battery management system comprises the detection module, the detection module comprises an interlocking detection unit and a terminal detection unit, the interlocking detection unit is used for determining whether the high-voltage connector is normally connected or not, the water inlet detection unit is used for determining the sealing state of the high-voltage connector based on a humidity value determined by the humidity sensor assembly, the terminal detection unit is used for determining the connection state of the high-voltage connector based on an electric signal determined by the displacement sensor assembly, and the control module is used for issuing corresponding control instructions according to detection results of the three detection units. The battery system of the vehicle can improve the reliability and safety of high-voltage loop connection.

Inventors

LIU LICHAO
ZHAO QIUMING
XIA JICAI
MAO SHUNJIE
TANG ZHONGYUAN

Assignees

上海轩邑新能源发展有限公司

Dates

Publication Date: 20260508
Application Date: 20260309

Claims (10)

1. A battery system of a vehicle, characterized by comprising: The high-voltage connector comprises a connector plug and a connector socket, wherein a displacement sensor assembly and a humidity sensor assembly are arranged on the connector plug, and after the connector plug is inserted with the connector socket, the high-voltage power terminal and the interlocking signal terminal can be inserted, wherein the displacement sensor assembly is used for determining an electric signal corresponding to displacement change caused by the insertion, and the humidity sensor assembly is used for determining a humidity value in the high-voltage connector; a battery management system comprising: a detection module, the detection module comprising: The interlocking detection unit is connected with the interlocking signal terminal and is used for determining whether the high-voltage connector is normally connected; The water inflow detection unit is connected with the humidity sensor assembly and is used for determining the sealing state of the high-voltage connector based on the humidity value determined by the humidity sensor assembly; a terminal detection unit connected with the displacement sensor assembly for determining a connection state of the high-voltage connector based on the electrical signal determined by the displacement sensor assembly, the connection state including complete plugging, virtual plugging and unconnected; And the control module is used for issuing corresponding control instructions according to detection results of the interlocking detection unit, the water inlet detection unit and the terminal detection unit.
2. The vehicle battery system of claim 1, wherein the control instructions include one or more of an audible and visual alarm, a power reduction, a prohibition of high voltage power up, and a disconnection of a high voltage relay, and/or the electrical signal includes a voltage signal.
3. A control method of the battery system of the vehicle according to claim 1 or 2, characterized by comprising: Determining whether the high voltage connector is connected normally; Under the condition that the high-voltage connector is normally connected, determining whether the humidity value is larger than a preset humidity threshold value or not; Under the condition that the humidity value is not larger than a preset humidity threshold value, determining the connection state of the high-voltage connector, and executing corresponding control instructions based on different connection states; determining whether the vehicle is in a stopped state or not under the condition that the humidity value is larger than a preset humidity threshold value; and reducing power to a preset power value under the condition that the vehicle is not in the stop state.
4. The control method of the battery system of the vehicle according to claim 3, characterized by further comprising: And when the vehicle is determined to be in the stopped state and is in high voltage power up, opening a high voltage relay.
5. The method according to claim 4, wherein the step of disabling the high-voltage relay in the case where it is determined that the vehicle is in the stopped state and is not high-voltage-powered, further comprises: The red acousto-optic alarm lamp prompts corresponding faults.
6. The control method of a battery system of a vehicle according to claim 3, wherein the step of determining the connection state of the high-voltage connector and executing the corresponding control instruction based on the different connection states in the case where it is determined that the humidity value is not greater than a preset humidity threshold value includes: In the case where it is determined that the connection state of the high-voltage connector is unconnected, performing the step of determining whether the vehicle is in a stopped state; in the case where it is determined that the connection state of the high-voltage connector is a virtual connection, performing the step of determining whether the vehicle is in a stopped state; In the case where it is determined that the connection state of the high-voltage connector is completely plugged, the step of determining whether the high-voltage connector is connected normally is performed.
7. The control method of the battery system of the vehicle according to claim 3, wherein the step of determining whether the vehicle is in a stopped state in the case where it is determined that the humidity value is greater than a preset humidity threshold value includes: determining whether the preset time is continuously exceeded under the condition that the humidity value is determined to be larger than a preset humidity threshold value; determining whether the vehicle is in a stopped state or not under the condition that the duration exceeds the preset time; And under the condition that the duration is not longer than the preset time, the yellow alarm lamp prompts that the short-time humidity abnormality does not exist, the connection state of the high-voltage connector is determined, and corresponding control instructions are executed based on different connection states.
8. The control method of the battery system of the vehicle according to claim 3, wherein the interlock detecting unit includes a PWM signal source, a voltage dividing resistor, a signal transmitting terminal, and a signal receiving terminal, and the determining whether the high voltage connector is connected normally includes: Determining whether the waveform of the signal receiving end of the interlocking detection unit is consistent with that of the signal transmitting end; Under the condition that the waveform of the signal receiving end of the interlocking detection unit is consistent with that of the signal sending end, the high-voltage connector is determined to be normally connected; And under the condition that the waveform of the signal receiving end of the interlocking detection unit is inconsistent with that of the signal sending end, determining that the high-voltage connector is abnormally connected.
9. The control method of the battery system of the vehicle according to claim 3, characterized in that the step of reducing power to a preset power value in the case where it is determined that the vehicle is not in the stopped state includes: determining additional impedance caused by different faults including an interlocking open circuit, different degrees of ingress, and the high voltage connector being either loose or unconnected; determining a preset relation between different faults and lost power under different currents based on the additional impedance caused by the different faults; determining a maximum power loss threshold value allowed by different faults based on the preset relation between different faults and power loss under different currents, so as to determine a maximum allowed current; and determining the maximum allowable output power based on the maximum allowable current allowed by different faults and the voltage value of the battery system when corresponding faults occur, wherein the preset power value does not exceed the maximum allowable output power.
10. The control method of a battery system of a vehicle according to claim 3, wherein the step of determining the connection state of the high-voltage connector and executing the corresponding control instruction based on the different connection states in the case where it is determined that the humidity value is not greater than a preset humidity threshold value includes: Determining a voltage signal corresponding to a displacement change caused by the opposite insertion of the connector plug and the connector socket; the connection state of the high voltage connector is determined based on the voltage signal.

Description

Battery system of vehicle and control method thereof Technical Field The present invention relates to the field of electric appliances, and more particularly, to a battery system for a vehicle and a control method thereof. Background With the rapid development of high-voltage electric platforms such as new energy automobiles and energy storage systems, the high-voltage connector is used as a key electric energy transmission and circuit connection component, and the reliability and the safety of the work of the high-voltage connector are important. High voltage connectors typically carry hundreds of volts and hundreds of amperes of current, and once a connection failure occurs, overheating, arcing, and even safety hazards may occur. In order to ensure high-voltage interlocking safety, the technical scheme adopted in the current industry is that state monitoring is realized through a high-voltage interlocking loop (High Voltage Interlock Loop, HVIL) built in a high-voltage connector. The circuit is typically formed by a pair of independent low voltage signal terminals arranged in parallel with the high voltage power terminals. The HVIL circuit is conductive when the connector is fully plugged and is disconnected when the connector is not plugged or unplugged. The on-off signal is transmitted to a Battery management system (Battery MANAGEMENT SYSTEM, BMS) or a vehicle controller, and the controller judges whether the connector is in a physical connection state according to the on-off signal and determines the power-on or power-off of the high-voltage main loop according to the on-off signal. However, the scheme for detecting the on-off state of the HVIL loop by the BMS or the whole vehicle controller has the following defects that firstly, the sectional detection cannot be performed, namely whether the virtual connection exists in the connector cannot be judged, secondly, whether water enters the connector cannot be detected, namely the sealing state of the connector cannot be judged, thirdly, the sectional detection and the internal water inlet condition cannot be detected, and further, fault alarm and corresponding safety protection action cannot be performed in time when a fault occurs. Disclosure of Invention In a first aspect, an embodiment of the present application provides a battery system of a vehicle, including: The high-voltage connector comprises a connector plug and a connector socket, wherein the connector plug is provided with a displacement sensor assembly and a humidity sensor assembly, after the connector plug is inserted with the connector socket, the high-voltage power terminal and the interlocking signal terminal can be inserted, the displacement sensor assembly is used for determining an electric signal corresponding to displacement change caused after the insertion, and the humidity sensor assembly is used for determining a humidity value in the high-voltage connector; a battery management system comprising: the detection module, detection module includes: the interlocking detection unit is connected with the interlocking signal terminal and is used for determining whether the high-voltage connector is normally connected; The water inlet detection unit is connected with the humidity sensor assembly and is used for determining the sealing state of the high-voltage connector based on the humidity value determined by the humidity sensor assembly; The terminal detection unit is connected with the displacement sensor assembly and is used for determining the connection state of the high-voltage connector based on the electric signal determined by the displacement sensor assembly, wherein the connection state comprises complete plugging, virtual connection and unconnected connection; And the control module is used for issuing corresponding control instructions according to detection results of the interlocking detection unit, the water inlet detection unit and the terminal detection unit. In some embodiments, the control instructions include one or more of an audible and visual alarm, a power reduction, disabling high voltage power up, and opening the high voltage relay, and/or the electrical signals include voltage signals. In a second aspect, an embodiment of the present application provides a control method of a battery system of a vehicle as set forth in the first aspect, including: determining whether the high-voltage connector is normally connected; Under the condition that the high-voltage connector is normally connected, determining whether the humidity value is larger than a preset humidity threshold value or not; under the condition that the humidity value is not larger than a preset humidity threshold value, determining the connection state of the high-voltage connector, and executing corresponding control instructions based on different connection states; determining whether the vehicle is in a stopped state or not under the condition that the humidity value is determined to be larg