Relay adhesion detection method for high-voltage loop in vehicle, battery and vehicle

Abstract

The invention discloses a relay adhesion detection method for a high-voltage loop in a vehicle, a battery and an automobile, and the method comprises the steps: switching the closing state of a main positive relay and / or a main negative relay in the high-voltage loop through a vehicle controller, so as to control the operation state of the high-voltage loop; in the power-on process of the vehicle, the main positive relay and the main negative relay are controlled to sequentially conduct state switching of first closing and then disconnection, first voltage data are collected, and whether the main positive relay and / or the main negative relay are / is in an adhesion state or not is judged according to the first voltage data; and in the vehicle power-off process, the main positive relay and the main negative relay are controlled to be disconnected, second voltage data and third voltage data are collected, whether the main negative relay is in an adhesion state or not is judged according to the second voltage data, and whether the main positive relay is in an adhesion state or not is judged according to the third voltage data. According to the invention, the adhesion condition of the relay on the high-voltage loop can be efficiently detected at low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of relay adhesion detection, and in particular to a relay adhesion detection method for a high-voltage circuit in a vehicle, a battery and a vehicle. Background Art

[0002] Existing new energy vehicles generally have a high-voltage circuit in the power battery, which includes not only the main positive relay and the main negative relay, but also the pre-charge relay. In order to ensure the normal operation of the high-voltage circuit, it is necessary to perform adhesion detection on the relays in the high-voltage circuit. Relay adhesion may cause the high-voltage circuit to fail to disconnect correctly, causing safety hazards such as battery overheating, short circuit and even fire. Through adhesion detection, adhesion can be discovered and handled in time to ensure the safe operation of the circuit.

[0003] In the prior art, a separate relay adhesion detection circuit needs to be added to respectively detect whether the main positive relay, the main negative relay and the pre-charge relay are in a adhesion state. The newly added detection circuit results in a higher detection cost and makes the circuit structure more complicated.

[0004] Therefore, it is necessary to provide a method for reducing the detection cost of detecting whether a relay in a high-voltage circuit in a vehicle is stuck. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcoming of high cost of relay adhesion detection in high-voltage circuits in the prior art, and to provide a method, battery and automobile for detecting relay adhesion in a high-voltage circuit in a vehicle. The method simplifies the relay adhesion judgment process by setting a high-voltage circuit that only includes a main positive relay and a main negative relay but does not include a pre-charge relay. The state switching and voltage acquisition of the relay can be achieved through the original circuit in the vehicle without the need for additional detection circuits. The specific relay that has adhesion can also be determined. On the premise of ensuring user safety, the detection structure is simplified, low-cost and efficient, and the effect of relay adhesion detection in a high-voltage circuit is achieved.

[0006] The technical solution of the present invention provides a method for detecting relay adhesion in a high-voltage circuit of a vehicle, comprising:

[0007] Switching the closing state of the main positive relay and / or the main negative relay in the high-voltage circuit through the vehicle controller to control the operating state of the high-voltage circuit;

[0008] During the vehicle power-on process, controlling the main positive relay and the main negative relay to successively switch between states of first closing and then opening, collecting first voltage data, and judging whether the main positive relay and / or the main negative relay are in a sticking state according to the first voltage data;

[0009] During the vehicle power-off process, the main positive relay and the main negative relay are controlled to be disconnected, and the second voltage data and the third voltage data are collected. It is determined whether the main negative relay is in a sticking state based on the second voltage data, and it is determined whether the main positive relay is in a sticking state based on the third voltage data.

[0010] In one of the optional technical solutions, the controlling the main positive relay and the main negative relay to be disconnected and collecting the second voltage data and the third voltage data includes:

[0011] Control the main negative relay to disconnect, collect the second voltage data, and then control the main positive relay to disconnect;

[0012] determining whether the main negative relay is in a sticking state according to the second voltage data;

[0013] Control the battery management system to close the relay switch S1 through the insulation detection circuit, collect the third voltage data, and then open the relay switch S1;

[0014] It is determined whether the main positive relay is in a sticking state according to the third voltage data.

[0015] In one of the optional technical solutions, the insulation detection circuit includes a voltage-dividing resistor R1, a voltage-dividing resistor R2 and a relay switch S1, and the relay switch S1 is arranged between the voltage-dividing resistor R1 and the voltage-dividing resistor R2;

[0016] The third voltage data is obtained by collecting the voltage value across the voltage-dividing resistor R2.

[0017] In one of the optional technical solutions, the switching of the relay switch state, collecting third voltage data, and judging whether the main positive relay is in a sticking state according to the third voltage data include:

[0018] The battery management system controls the relay switch S1 in the insulation detection circuit to be powered effectively, and drives the relay switch S1 to close for a preset time;

[0019] The voltage U3 across the voltage-dividing resistor R2 is measured by the insulation detection circuit and used as the third voltage data;

[0020] Determine whether the voltage U3 is greater than a preset voltage according to the third voltage data;

[0021] If the third voltage data is greater than the preset voltage, it is determined that the main positive relay is in a sticking state.

[0022] In one of the optional technical solutions, the voltage U3 is obtained by the voltage U bat, the resistance value of the voltage-dividing resistor R1 and the resistance value of the voltage-dividing resistor R2 are calculated;

[0023] The specific calculation method of U3 is:

[0024]

[0025] In one of the optional technical solutions, the high-voltage circuit includes a main positive relay, a high-voltage battery pack and a main negative relay connected in sequence to form a battery pack module;

[0026] The first voltage data and the second voltage data are obtained by collecting voltage values ​​at both ends of the battery pack module.

[0027] In one of the optional technical solutions, during the vehicle power-on process, controlling the main positive relay and the main negative relay to successively switch between states of first closing and then opening, collecting first voltage data, and judging whether the main positive relay and / or the main negative relay is in a sticking state according to the first voltage data, including:

[0028] Controlling the main positive relay to close by the vehicle controller, continuously detecting the voltage value at both ends of the battery pack module and adding it to the first voltage data;

[0029] According to the first voltage data, if the voltage value across the battery pack module is greater than 0 during the closing period of the main positive relay, it is determined that the main positive relay is in a sticking state;

[0030] After the main positive relay is continuously closed for a preset time, the main positive relay is controlled to be disconnected by the vehicle controller;

[0031] Controlling the main negative relay to close by the vehicle controller, continuously detecting the voltage value at both ends of the battery pack module and adding it to the first voltage data;

[0032] According to the first voltage data, if the voltage value across the battery pack module is greater than 0 during the closing period of the main negative relay, it is determined that the main negative relay is in a sticking state;

[0033] After the main negative relay is closed continuously for a preset time, the main negative relay is controlled to be opened by the vehicle controller.

[0034] In one of the optional technical solutions, after collecting the first voltage data and determining whether the main positive relay and / or the main negative relay is in a sticking state according to the first voltage data, the method further includes:

[0035] The vehicle controller controls the DC-DC controller to pre-charge the high-voltage circuit with high voltage for a preset time, so that the vehicle enters a high-voltage pre-charging state;

[0036] Collect fourth voltage data, and determine whether the main positive relay and / or the main negative relay is in a sticking state according to the fourth voltage data.

[0037] The technical solution of the present invention provides a power battery, including a battery management system, a high-voltage circuit and a battery pack module arranged on the high-voltage circuit, the battery pack module includes a main positive relay, a main fuse, a high-voltage battery pack and a main negative relay connected in sequence, the input end and the output end of the battery pack module are respectively electrically connected to the battery management system, the fast charging port and the DC-DC converter, the main positive relay and the main negative relay are respectively connected to the vehicle controller for communication;

[0038] When the power battery is running, the steps of any of the aforementioned methods for detecting relay adhesion in a high-voltage circuit of a vehicle are implemented.

[0039] The technical solution of the present invention provides a vehicle, including a vehicle body, on which the aforementioned power battery is provided, and when the power vehicle is running, any step of the aforementioned method for detecting relay adhesion in a high-voltage circuit of the vehicle is implemented.

[0040] The above technical solution has the following beneficial effects:

[0041] The relay adhesion detection method of the high-voltage circuit in the vehicle provided by the present invention simplifies the relay adhesion judgment process by setting a high-voltage circuit that only includes the main positive relay and the main negative relay but does not include the pre-charge relay, so as to simplify the detection structure and reduce the production cost of this part. On the other hand, the present invention can realize the state switching and voltage acquisition of the relay through the original circuit in the vehicle, and judge whether the relay adhesion occurs during the power-on and power-off process of the vehicle according to the voltage data by switching the state of the main positive relay and the main negative relay and collecting voltage data respectively. In the whole detection process, only the original vehicle controller and battery management system of the vehicle and the original circuit need to be used, so there is no need to set up an additional detection circuit, and the specific relay that has adhesion can be judged. Under the premise of ensuring user safety, the detection structure is simplified, low-cost and efficient. The effect of relay adhesion detection in the high-voltage circuit is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0043] Figure 1 A flowchart of a method for detecting relay adhesion in a high-voltage circuit in a vehicle provided by an embodiment of the present invention;

[0044] Figure 2 A flowchart of a method for detecting relay adhesion in a high-voltage circuit in a vehicle provided by another embodiment of the present invention;

[0045] Figure 3 A flowchart of a method for detecting relay adhesion in a high-voltage circuit in a vehicle provided by another embodiment;

[0046] Figure 4 A structural diagram of a power battery provided in one embodiment of the present invention;

[0047] Figure 5 A flowchart of a method for detecting relay adhesion in a high-voltage circuit in a vehicle provided by another embodiment of the present invention;

[0048] Figure 6 A structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0050] like Figure 1 A method for detecting relay adhesion in a high-voltage circuit of a vehicle provided by an embodiment of the present invention includes:

[0051] Step S101: Switching the closing state of the main positive relay and / or the main negative relay in the high-voltage circuit through the vehicle controller to control the operating state of the high-voltage circuit.

[0052] Step S102: During the vehicle power-on process, the main positive relay and the main negative relay are controlled to switch between states of first closing and then opening, first voltage data is collected, and whether the main positive relay and / or the main negative relay are in a sticking state is determined based on the first voltage data.

[0053] Step S103: During the vehicle power-off process, the main positive relay and the main negative relay are controlled to be disconnected, the second voltage data and the third voltage data are collected, and it is determined whether the main negative relay is in a sticking state according to the second voltage data, and whether the main positive relay is in a sticking state according to the third voltage data.

[0054] Among them, in step S101, the main positive relay and the main negative relay in the high-voltage circuit are switched in state through the vehicle control module (VCM), specifically switching between a closed state and an open state. In the embodiment of the present invention, the high-voltage circuit only includes the main positive relay and the main negative relay, and no pre-charge relay is provided, nor is an additional detection circuit for detecting relay adhesion provided, so the manufacturing cost of the battery system will not be increased additionally.

[0055] The voltage data in step S102 and step S103 are collected and analyzed by the battery management system (Battery Management System, referred to as BMS). The collection points of the first voltage data and the second voltage data are fixed, specifically the voltage values ​​on both sides of the main positive relay and the main negative relay after being connected in series. In the following text, the part where the main positive relay, the high-voltage battery pack and the main negative relay are connected in sequence is called the "battery pack module". The description of the battery pack module is mainly for the convenience of locating the voltage detection point, and is not a limitation of the circuit structure of the present invention. Since it is not necessary to collect voltages at multiple groups of positions, it is only necessary to continuously detect the voltages at two points to collect all the voltage parameters required for relay adhesion judgment. Therefore, the process of voltage detection and judgment calculation is simpler and more efficient.

[0056] In the prior art, to detect whether a relay is stuck, a detection circuit such as an electromagnetic induction circuit needs to be set on each high-voltage relay, or multiple groups of voltages at different positions need to be collected for comprehensive calculation to determine the sticking condition of the relay. This will increase the complexity of the circuit and the detection cost is high.

[0057] In an embodiment of the present invention, in step S102, during the power-on process of the vehicle, the main positive relay in the high-voltage circuit is first controlled to be closed by the vehicle controller, and then the voltage parameter is collected and added to the first voltage data. After the main positive relay is closed for a preset time, for example, 500ms, the main positive relay is disconnected. Thereafter, the main negative relay in the high-voltage circuit is controlled to be closed by the vehicle controller, and then the voltage parameter is collected and added to the first voltage data. After the main negative relay is closed for a preset time, for example, 500ms, the main negative relay is disconnected. Whether the main positive relay or the main negative relay is stuck is determined based on the first voltage data collected, specifically, whether the corresponding relay is in a stuck state is determined by determining whether high voltage appears at both ends of the battery pack module during the closing of the main positive relay or the main negative relay, thereby ensuring that the relay will not stick after the vehicle is powered on.

[0058] Step S103 includes: during the power-off process of the vehicle, the main negative relay is controlled to be disconnected by the vehicle controller, and the disconnection is preset for a time, such as 300ms. During the disconnection period of the main negative relay, the voltage value at both ends of the battery pack module is continuously detected and added to the second voltage data. According to the second voltage data, if the voltage value at both ends of the battery pack module slowly decreases after the main negative relay is disconnected, it is judged that the main negative relay is in a sticking state. After the main negative relay is continuously disconnected for a preset time, the main positive relay is controlled to be disconnected by the vehicle controller. By detecting the sticking state of the main negative relay of the vehicle during the power-off process, the situation of relay sticking after the vehicle is powered off can be avoided. Avoid battery short circuit, overheating and the like. In this case, the sticking state of the main positive relay needs to be judged by the insulation detection circuit, specifically by switching the state of the relay switch S1 in the insulation detection circuit and collecting the voltage value at both ends of the voltage divider resistor as the third voltage data, and judging whether the main positive relay is sticking according to the value of the third voltage data.

[0059] According to needs, a detection method that does not pass the insulation detection circuit can also be used to determine the main positive relay during the vehicle power-off process. At this time, the order of closing and opening the main positive relay and the main negative relay is also different from the aforementioned detection method. Specifically, during the vehicle power-off process, the main positive relay is first disconnected for a preset time, such as 500ms, and then the voltage at both ends of the battery pack module is collected as the third voltage data. If the voltage in the third voltage data slowly decreases over time, it is determined that the main positive relay is in a sticking state. After the main positive relay is disconnected for a preset time, the main negative relay is disconnected, and then the main positive relay is closed for a preset time, such as 500ms. At this time, the voltage at both ends of the battery pack module is collected as the second voltage data. If the voltage in the second voltage data slowly decreases over time, it is determined that the main negative relay is in a sticking state. After the main positive relay is closed for a preset time, the main positive relay is disconnected to complete the relay adhesion detection during the vehicle power-off process.

[0060] To summarize, the relay adhesion detection method for the high-voltage circuit in a vehicle provided by an embodiment of the present invention simplifies the relay adhesion judgment process by setting up a high-voltage circuit that only includes a main positive relay and a main negative relay but does not include a pre-charge relay, thereby simplifying the detection structure and reducing the production cost of this part.

[0061] On the other hand, the method provided in an embodiment of the present invention can realize relay state switching and voltage collection by reusing the original circuit in the vehicle, by switching the states of the main positive relay and the main negative relay and collecting voltage data respectively, and judging whether relay sticking occurs during the power-on and power-off processes of the vehicle according to the voltage data.

[0062] Since only the vehicle's original vehicle controller, battery management system and original circuit need to be reused during the entire detection process, there is no need to set up an additional detection circuit. The specific relay where adhesion occurs can also be determined. Under the premise of ensuring user safety, the detection structure is simplified, low-cost and efficient, and the effect of relay adhesion detection in the high-voltage circuit can be achieved.

[0063] In one embodiment, if Figure 2 As shown, step S103 includes:

[0064] Step S201: Control the main negative relay to be disconnected, collect the second voltage data, and then control the main positive relay to be disconnected.

[0065] Step S202: Determine whether the main negative relay is in a sticking state according to the second voltage data.

[0066] Step S203: Control the battery management system to close the relay switch S1 through the insulation detection circuit, collect the third voltage data, and then open the relay switch S1.

[0067] Step S204: judging whether the main positive relay is in a sticking state according to the third voltage data.

[0068] In this embodiment, during the vehicle power-off process, the main negative relay and the main positive relay are disconnected successively, the second voltage data is collected, and it is determined whether the main negative relay is in a sticking state, and then the main positive relay in the high-voltage circuit is tested for the sticking state through the vehicle's original insulation detection circuit. By closing the relay switch S1 in the insulation detection circuit, the voltage data of the voltage divider resistor is detected to determine whether the main positive relay in the high-voltage circuit is in a sticking state. Since this is the last relay sticking detection after the vehicle is powered off, the main positive relay is tested for sticking through the insulation detection circuit, which can avoid the situation where the relay is stuck and difficult to detect due to the re-closing of the main positive relay, and further ensure the accuracy of the relay sticking state detection.

[0069] In one embodiment, if Figure 3 As shown, the insulation detection circuit includes a voltage-dividing resistor R1, a voltage-dividing resistor R2 and a relay switch S1, and the relay switch S1 is arranged between the voltage-dividing resistor R1 and the voltage-dividing resistor R2. The third voltage data is obtained by collecting the voltage value across the voltage-dividing resistor R2. The voltage-dividing resistor R1 and the voltage-dividing resistor R2 are connected in series, and the voltage value across the voltage-dividing resistor R2 is a voltage U3, and the third voltage data is obtained by collecting the voltage U3. The detection positions of voltage U1, voltage U2 and voltage U4 are irrelevant to the relay adhesion judgment of the present invention, and therefore are not described in detail here.

[0070] In one embodiment, if Figure 3 As shown, step S104 includes:

[0071] Step S301: The battery management system controls the relay switch S1 in the insulation detection circuit to supply power effectively, and drives the relay switch S1 to close for a preset time.

[0072] Step S302: The voltage U3 across the voltage-dividing resistor R2 is measured by the insulation detection circuit and used as the third voltage data.

[0073] Step S303: determining whether the voltage U3 is greater than a preset voltage according to the third voltage data.

[0074] Step S304: If the third voltage data is greater than the preset voltage, it is determined that the main positive relay is in a sticking state.

[0075] Furthermore, the voltage U3 is obtained by the voltage U bat , the resistance value of the voltage-dividing resistor R1 and the resistance value of the voltage-dividing resistor R2 are calculated to obtain the value.

[0076] The specific calculation method of U3 is:

[0077]

[0078] In this embodiment, by detecting and calculating the voltage U3 across the voltage-dividing resistor R2, and judging whether the voltage U3 is greater than a preset voltage threshold, it is judged whether the main positive relay is in a sticking state. As required, the calculation method of U3 can also be obtained by directly detecting the voltage across the voltage-dividing resistor R2 or other methods that can detect the voltage across R2.

[0079] In one embodiment, if Figure 5 As shown, the high-voltage circuit includes a main positive relay, a high-voltage battery pack and a main negative relay connected in sequence to form a battery pack module.

[0080] The first voltage data and the second voltage data are both obtained by collecting the voltage values ​​at both ends of the battery pack module. Figure 5 As shown, point A and point B are the collection points of the voltage values ​​at both ends of the battery pack module, and are also the connection endpoints connected to various external ports.

[0081] In one embodiment, step S102 includes:

[0082] The main positive relay is controlled to close through the vehicle controller, and the voltage value at both ends of the battery pack module is continuously detected and added to the first voltage data.

[0083] According to the first voltage data, if the voltage value across the battery pack module is greater than 0 during the closing period of the main positive relay, it is determined that the main positive relay is in a sticking state.

[0084] After the main positive relay is closed continuously for a preset time, the main positive relay is controlled to be opened through the vehicle controller.

[0085] The main negative relay is controlled to close through the vehicle controller, and the voltage value at both ends of the battery pack module is continuously detected and added to the first voltage data.

[0086] According to the first voltage data, if the voltage value across the battery pack module is greater than 0 during the closing period of the main negative relay, it is determined that the main negative relay is in a sticking state.

[0087] After the main negative relay is closed continuously for a preset time, the main negative relay is controlled to be opened through the vehicle controller.

[0088] In this embodiment, the vehicle controller controls the main positive relay to be continuously closed and then disconnected, and then controls the main negative relay to be closed and then disconnected. In this process, the voltage at both ends of the battery pack module is continuously detected to ensure that no high voltage occurs during the entire process, so as to ensure that the main positive relay and the main negative relay are not in a sticking state. After ensuring the safety of the vehicle's relays, the vehicle is controlled to complete power-on.

[0089] In one embodiment, if Figure 5 As shown, after step S102, the following steps are also included:

[0090] Step S501: Controlling the DC-DC controller through the vehicle controller to pre-charge the high-voltage circuit with high voltage for a preset time, so that the vehicle enters a high-voltage pre-charging state.

[0091] Step S502: collecting fourth voltage data, and determining whether the main positive relay and / or the main negative relay is in a sticking state according to the fourth voltage data.

[0092] This embodiment monitors the adhesion status of the main positive relay and the main negative relay by collecting the fourth voltage data in the pre-charging stage of the vehicle. The collection point of the fourth voltage data is the same as the collection point of the first voltage data and the second voltage data, and there is no need to set up an additional voltage collection circuit. By performing relay adhesion detection in the pre-charging stage after the vehicle is powered on and before discharge, it is confirmed again that the main positive relay and the main negative relay in the high-voltage circuit are not adhered, so as to ensure the driving safety of the vehicle.

[0093] like Figure 4As shown, an embodiment of the present invention provides a power battery, including a battery management system, a high-voltage circuit, and a battery pack module arranged on the high-voltage circuit. The battery pack module includes a main positive relay, a main fuse, a high-voltage battery pack, and a main negative relay connected in sequence. The input and output ends of the battery pack module are electrically connected to the battery management system, the fast charging port, and the DC-DC converter, respectively. The main positive relay and the main negative relay are respectively connected to the vehicle controller for communication. The part of the power battery connected to the fast charging port is also provided with a relay for fast charging.

[0094] All steps of the method for detecting relay adhesion in a high-voltage circuit of a vehicle in any of the aforementioned embodiments are implemented when the power battery is running.

[0095] exist Figure 4 In the diagram, the battery management system is BMS, the vehicle controller is VCM, the DC-DC converter is DCDC, and the fast charging port is QC port.

[0096] An embodiment of the present invention provides a vehicle, including a vehicle body, on which is disposed a power battery in the aforementioned embodiment, and all steps of the relay adhesion detection method for a high-voltage circuit in a vehicle of any of the aforementioned embodiments are implemented when the power vehicle is running.

[0097] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0098] like Figure 6 The figure shows a hardware structure diagram of an electronic device of the present invention, including a memory 602, a processor 601 and an electronic device program on the memory 602, and the processor 601 executes the electronic device program to implement the steps of the relay adhesion detection method of the high-voltage circuit in a vehicle of any of the above-mentioned embodiments.

[0099] Figure 6 A processor 601 is taken as an example.

[0100] The electronic device may further include: an input device 603 and a display device 604 .

[0101] The processor 601, the memory 602, the input device 603 and the display device 604 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0102] The memory 602 is a non-volatile electronic device readable storage medium, which can be used to store non-volatile software programs, non-volatile electronic device executable programs and modules, such as the program instructions / modules corresponding to the relay adhesion detection method for the high-voltage circuit in the vehicle in the embodiment of the present application. The processor 601 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 602, that is, realizing the relay adhesion detection method for the high-voltage circuit in the vehicle in the above embodiment.

[0103] The memory 602 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the relay adhesion detection method for the high-voltage circuit in the vehicle, etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 602 may optionally include a memory remotely arranged relative to the processor 601, and these remote memories may be connected to a device for executing the relay adhesion detection method for the high-voltage circuit in the vehicle through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0104] The input device 603 can receive input user clicks and generate signal inputs related to user settings and function control of the relay adhesion detection method of the high-voltage circuit in the vehicle. The display device 604 can include display devices such as a display screen.

[0105] The one or more modules are stored in the memory 602 , and when being run by the one or more processors 601 , the relay adhesion detection method for a high-voltage circuit in a vehicle in any of the above method embodiments is executed.

[0106] When the electronic device disclosed by the present invention is in operation, it can execute all the steps of the above-mentioned method for detecting relay adhesion in a high-voltage circuit in a vehicle. By setting a high-voltage circuit that only includes a main positive relay and a main negative relay but does not include a pre-charge relay, the relay adhesion judgment process is simplified. The state switching and voltage acquisition of the relay can be realized by reusing the original circuit in the vehicle. There is no need to set up an additional detection circuit. The specific relay that has adhesion can also be determined. Under the premise of ensuring user safety, the detection structure is simplified, and the effect of relay adhesion detection in a high-voltage circuit with low cost and high efficiency is achieved.

[0107] An embodiment of the present invention provides an electronic device readable storage medium, which stores an electronic device program / instruction. When the electronic device program / instruction is executed by the processor 601, all steps of the relay adhesion detection method for the high-voltage circuit in the vehicle as described above are implemented.

[0108] In the context of the present disclosure, a storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. The storage medium may be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium may be a non-temporary electronic device readable storage medium, for example, a non-temporary electronic device readable storage medium may be a ROM, a random access memory (Random Access Memory, RAM), a compact disc read-only memory (Compact Disc ROM, CD-ROM), a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0109] An embodiment of the present invention provides an electronic device program product, including an electronic device program / instruction, which, when executed by a processor, implements the steps of the relay adhesion detection method for a high-voltage circuit in a vehicle as described above.

[0110] By running the above-mentioned electronic device program product, all steps of the relay adhesion detection method for the high-voltage circuit in the vehicle as described above can be executed. By setting a high-voltage circuit that only includes a main positive relay and a main negative relay but does not include a pre-charge relay, the relay adhesion judgment process is simplified. The state switching and voltage acquisition of the relay can be realized by reusing the original circuit in the vehicle. There is no need to set up an additional detection circuit. The specific relay that has adhesion can also be determined. Under the premise of ensuring user safety, the detection structure is simplified, and the effect of relay adhesion detection in the high-voltage circuit is achieved with low cost and high efficiency.

[0111] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for detecting relay adhesion in a high-voltage circuit of a vehicle, characterized in that: include: Switching the closing state of the main positive relay and / or the main negative relay in the high-voltage circuit through the vehicle controller to control the operating state of the high-voltage circuit; During the vehicle power-on process, controlling the main positive relay and the main negative relay to successively switch between states of first closing and then opening, collecting first voltage data, and judging whether the main positive relay and / or the main negative relay are in a sticking state according to the first voltage data; During the vehicle power-off process, the main positive relay and the main negative relay are controlled to be disconnected, and the second voltage data and the third voltage data are collected. It is determined whether the main negative relay is in a sticking state based on the second voltage data, and it is determined whether the main positive relay is in a sticking state based on the third voltage data.

2. The method for detecting relay adhesion in a high voltage circuit in a vehicle according to claim 1, characterized in that: The controlling the main positive relay and the main negative relay to be disconnected and collecting the second voltage data and the third voltage data includes: Control the main negative relay to disconnect, collect the second voltage data, and then control the main positive relay to disconnect; determining whether the main negative relay is in a sticking state according to the second voltage data; Control the battery management system to close the relay switch S1 through the insulation detection circuit, collect the third voltage data, and then open the relay switch S1; It is determined whether the main positive relay is in a sticking state according to the third voltage data.

3. The method for detecting relay adhesion in a high voltage circuit in a vehicle according to claim 2, characterized in that: The insulation detection circuit comprises a voltage-dividing resistor R1, a voltage-dividing resistor R2 and a relay switch S1, wherein the relay switch S1 is arranged between the voltage-dividing resistor R1 and the voltage-dividing resistor R2; The third voltage data is obtained by collecting the voltage value across the voltage-dividing resistor R2.

4. The method for detecting relay adhesion in a high voltage circuit in a vehicle according to claim 3, characterized in that: The switching of the relay switch state, collecting third voltage data, and judging whether the main positive relay is in a sticking state according to the third voltage data include: The battery management system controls the relay switch S1 in the insulation detection circuit to be powered effectively, and drives the relay switch S1 to close for a preset time; The voltage U3 across the voltage-dividing resistor R2 is measured by the insulation detection circuit and used as the third voltage data; Determine whether the voltage U3 is greater than a preset voltage according to the third voltage data; If the third voltage data is greater than the preset voltage, it is determined that the main positive relay is in a sticking state.

5. The method for detecting relay adhesion in a high-voltage circuit in a vehicle according to claim 4, characterized in that: The voltage U3 is obtained by the voltage U bat , the resistance value of the voltage-dividing resistor R1 and the resistance value of the voltage-dividing resistor R2 are calculated; The specific calculation method of U3 is:

6. The method for detecting relay adhesion in a high voltage circuit in a vehicle according to claim 1, characterized in that: The high-voltage circuit includes a main positive relay, a high-voltage battery pack and a main negative relay connected in sequence to form a battery pack module; The first voltage data and the second voltage data are obtained by collecting voltage values ​​at both ends of the battery pack module.

7. The method for detecting relay adhesion in a high voltage circuit in a vehicle according to claim 6, characterized in that: During the vehicle power-on process, controlling the main positive relay and the main negative relay to successively switch between states of closing first and then opening, collecting first voltage data, and judging whether the main positive relay and / or the main negative relay is in a sticking state according to the first voltage data, includes: Controlling the main positive relay to close by the vehicle controller, continuously detecting the voltage value at both ends of the battery pack module and adding it to the first voltage data; According to the first voltage data, if the voltage value across the battery pack module is greater than 0 during the closing period of the main positive relay, it is determined that the main positive relay is in a sticking state; After the main positive relay is continuously closed for a preset time, the main positive relay is controlled to be disconnected by the vehicle controller; Controlling the main negative relay to close by the vehicle controller, continuously detecting the voltage value at both ends of the battery pack module and adding it to the first voltage data; According to the first voltage data, if the voltage value across the battery pack module is greater than 0 during the closing period of the main negative relay, it is determined that the main negative relay is in a sticking state; After the main negative relay is closed continuously for a preset time, the main negative relay is controlled to be opened by the vehicle controller.

8. The method for detecting relay adhesion in a high voltage circuit in a vehicle according to claim 1, characterized in that: After collecting the first voltage data and determining whether the main positive relay and / or the main negative relay is in a sticking state according to the first voltage data, the method further includes: The vehicle controller controls the DC-DC controller to pre-charge the high-voltage circuit with high voltage for a preset time, so that the vehicle enters a high-voltage pre-charging state; Collect fourth voltage data, and determine whether the main positive relay and / or the main negative relay is in a sticking state according to the fourth voltage data.

9. A power battery, characterized in that: It includes a battery management system, a high-voltage circuit, and a battery pack module arranged on the high-voltage circuit. The battery pack module includes a main positive relay, a main fuse, a high-voltage battery pack, and a main negative relay connected in sequence. The input end and the output end of the battery pack module are electrically connected to the battery management system, the fast charging port, and the DC-DC converter respectively. The main positive relay and the main negative relay are respectively connected to the vehicle controller for communication; When the power battery is running, the steps of the method for detecting relay adhesion in a high-voltage circuit of a vehicle according to any one of claims 1 to 8 are implemented.

10. A vehicle, comprising a vehicle body, characterized in that: The vehicle body is provided with the power battery of claim 9, and the steps of the method for detecting relay adhesion of a high-voltage circuit in a vehicle according to any one of claims 1 to 8 are implemented when the power vehicle is running.

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