Relay welding diagnosis method and power battery system

Abstract

A relay welding diagnosis method and a power battery system. The method comprises: collecting a first front end voltage and a first rear end voltage of a main positive relay (S301); when it is determined, on the basis of the first front end voltage and the first rear end voltage, that the main positive relay is in a non-welded state, closing a pre-charge relay and collecting a second rear end voltage of the main positive relay, and when it is determined, on the basis of the second rear end voltage, that the pre-charge relay has been successfully closed, collecting a third rear end voltage of a main negative relay (S302); and when it is determined, on the basis of the third rear end voltage, that the main negative relay is in a non-welded state, disconnecting the pre-charge relay and collecting a fourth rear end voltage of the main positive relay, and when it is determined, on the basis of the fourth rear end voltage, that the pre-charge relay has been successfully disconnected, determining that no welding currently exists (S303). Thus, the problem of high detection cost caused by the need for two high-voltage sampling circuits in relay welding detection circuits is solved, and simultaneous detection of a main positive relay and a main negative relay is realized.

Description

Relay adhesion diagnosis method and power battery system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410225523.X and application date on February 28, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of power batteries, and in particular to a relay adhesion diagnosis method and a power battery system. Background Art

[0004] The high-voltage relay is the connection hub for the input and output of the power battery. In order to safely cut off the high voltage, a relay is generally arranged at the positive and negative poles. When the relay is turned on, it may fail due to the impact of large current or contact adhesion. In addition, during the high-voltage power-on process, a pre-charge circuit is required to pre-charge other components. If the main negative relay is closed when an abnormality occurs in the pre-charge circuit, five pre-charges may occur, which will cause the relay to adhere and fail. At present, the technical solution for detecting whether the main negative relay of the high-voltage circuit of the battery system is adhered requires two high-voltage negative acquisition channels.

[0005] In related technology, Figure 1 illustrates a high-voltage relay sticking detection circuit for electric vehicles. As shown in Figure 1, U1 and surrounding resistors form the first high-voltage differential sampling circuit, used to determine whether the main positive relay K1 is sticking. U2 and surrounding resistors form the second high-voltage differential sampling circuit, used to determine whether the main negative relay K2 is sticking. When K1 and K2 are disconnected, if the voltage detected by the U2 circuit is greater than 100V, the main negative relay K2 is diagnosed as sticking.

[0006] However, the relay diagnosis method in the related art has many circuit elements and a complex circuit structure. During the detection process, two high-voltage sampling circuits are required, resulting in a high relay detection cost, which needs to be solved urgently.

[0007] Summary of the Invention

[0008] The present application provides a relay adhesion diagnosis method and a power battery system to solve the problem in related technologies that relay adhesion diagnosis requires two high-voltage sampling circuits, resulting in high relay detection costs. Without adding additional electronic components, simultaneous detection of the main positive and main negative relays is achieved.

[0009] A first embodiment of the present application provides a method for diagnosing relay adhesion, comprising the following steps:

[0010] collecting a first front-end voltage and a first rear-end voltage of a main positive relay;

[0011] When it is determined that the main positive relay is in a non-sticky state according to the first front-end voltage and the first rear-end voltage, closing the pre-filling relay and collecting the second rear-end voltage of the main positive relay; and when it is determined that the pre-filling relay is in a closed state according to the second rear-end voltage, collecting the third rear-end voltage of the main negative relay;

[0012] When it is determined that the main negative relay is in the non-adhesion state based on the third rear-end voltage, the pre-filling relay is disconnected, and the fourth rear-end voltage of the main positive relay is collected. When it is determined that the pre-filling relay is in the successful disconnection state based on the fifth rear-end voltage, it is determined that there is no adhesion at present.

[0013] Optionally, in some embodiments, after acquiring the first front-end voltage and the first rear-end voltage of the main positive relay, the method further includes:

[0014] If the absolute value of the difference between the first front-end voltage and the first rear-end voltage is greater than a first preset voltage, it is determined that the main positive relay is in the non-adhesion state; otherwise, it is determined that the main positive relay is in the pre-adhesion state;

[0015] When it is determined that the main positive relay is in the non-adhesion state, the method further includes:

[0016] Periodically collecting the first front-end voltage and the first back-end voltage within a first preset time period;

[0017] If the absolute value of the difference between the first front-end voltage and the first rear-end voltage is continuously greater than the first preset voltage within the first preset time period, it is determined that the main positive relay is in the non-adhesion state; otherwise, it is determined that the main positive relay is in the pre-adhesion state.

[0018] Optionally, in some embodiments, when determining that the main positive relay is in the pre-adhesion state, the method further includes:

[0019] The first front-end voltage and the first rear-end voltage are periodically collected within a second preset time period; if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is less than or equal to the second preset voltage, it is determined that the main positive relay is in a sticking state, and a main positive relay sticking fault is sent to a preset mobile terminal; otherwise, the step of periodically collecting the first front-end voltage and the first rear-end voltage within the first preset time period is re-executed.

[0020] Optionally, in some embodiments, after collecting the second rear end voltage of the main positive relay, the method further includes:

[0021] After a third preset time period, if the second rear-end voltage is greater than a third preset voltage, it is determined that the pre-filling relay is in the closed success state; otherwise, it is determined that the pre-filling relay is in the closed failure state;

[0022] When it is determined that the pre-charging relay is in the closed state, the method further includes:

[0023] Periodically collecting the second rear-end voltage within a fourth preset time period;

[0024] If the second rear-end voltage is continuously greater than or equal to the fourth preset voltage within the fourth preset time period, it is determined that the pre-filling relay is in the closed success state; otherwise, it is determined that the pre-filling relay is in the closed failure state.

[0025] Optionally, in some embodiments, when determining that the pre-charging relay is in the closing failure state, the method further includes:

[0026] Periodically collecting the second rear-end voltage within a fifth preset time period;

[0027] If the second back-end voltage continues to be less than or equal to the third preset voltage within the fifth preset time period, a pre-charge relay closure failure fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the second back-end voltage within the fourth preset time period is re-executed.

[0028] Optionally, in some embodiments, after collecting the third rear-end voltage of the main negative relay, the method further includes:

[0029] After a sixth preset time period, if the third rear end voltage is greater than a fifth preset voltage, it is determined that the main negative relay is in the non-adhesion state; otherwise, it is determined that the main negative relay is in the pre-adhesion state;

[0030] When it is determined that the main negative relay is in the non-adhesion state, the method further includes:

[0031] Periodically collecting the third rear-end voltage within a seventh preset time period;

[0032] If the third rear-end voltage is continuously greater than or equal to the sixth preset voltage within the seventh preset time period, it is determined that the main negative relay is in the non-adhesion state; otherwise, it is determined that the main negative relay is in the pre-adhesion state.

[0033] Optionally, in some embodiments, when determining that the main negative relay is in the pre-adhesion state, the method further includes:

[0034] Periodically collecting the third rear-end voltage within an eighth preset time period;

[0035] If the third rear-end voltage is continuously less than or equal to the seventh preset voltage within the eighth preset time length, the main negative relay adhesion fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the third rear-end voltage within the seventh preset time length is re-executed.

[0036] Optionally, in some embodiments, after collecting the fourth rear end voltage of the main positive relay, the method further includes:

[0037] If the fourth rear-end voltage is less than the eighth preset voltage, it is determined that the pre-filling relay is in the disconnection success state; otherwise, it is determined that the pre-filling relay is in the disconnection failure state;

[0038] Wherein, determining that the pre-charging relay is in the disconnection success state includes:

[0039] Periodically collecting the fourth rear-end voltage within a ninth preset time period;

[0040] If the fourth rear-end voltage is continuously less than or equal to the ninth preset voltage within the ninth preset time period, it is determined that the pre-filling relay is in the disconnection success state; otherwise, it is determined that the pre-filling relay is in the disconnection failure state.

[0041] Optionally, in some embodiments, after determining that the pre-charging relay is in the disconnection failure state, the method further includes:

[0042] Periodically collecting the fourth rear-end voltage within a tenth preset time period;

[0043] If the fourth back-end voltage continues to be greater than or equal to the tenth preset voltage within the tenth preset time period, the pre-charging relay disconnection failure fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the fourth back-end voltage within the ninth preset time period is re-executed.

[0044] A second embodiment of the present application provides a relay adhesion diagnosis device, comprising:

[0045] An acquisition module, configured to acquire a first front-end voltage and a first rear-end voltage of a main positive relay;

[0046] a first determination module, configured to close the pre-filling relay and collect a second rear end voltage of the main positive relay when it is determined that the main positive relay is in a non-sticky state based on the first front end voltage and the first rear end voltage, and collect a third rear end voltage of the main negative relay when it is determined that the pre-filling relay is in a closed success state based on the second rear end voltage;

[0047] The second judgment module is used to disconnect the pre-filling relay when it is determined that the main negative relay is in the non-adhesion state according to the third rear-end voltage, and collect the fourth rear-end voltage of the main positive relay, and when it is determined that the pre-filling relay is in the successful disconnection state according to the fourth rear-end voltage, determine that there is no adhesion at present.

[0048] Optionally, in some embodiments, after collecting the first front-end voltage and the first rear-end voltage of the main positive relay, the collection module is further configured to:

[0049] When the absolute value of the difference between the first front-end voltage and the first rear-end voltage is greater than a first preset voltage, determining that the main positive relay is in the non-adhesion state; otherwise, determining that the main positive relay is in the pre-adhesion state;

[0050] When it is determined that the main positive relay is in the non-adhesion state, the acquisition module is further configured to:

[0051] Periodically collecting the first front-end voltage and the first back-end voltage within a first preset time period;

[0052] Within the first preset time period, if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is continuously greater than the first preset voltage, it is determined that the main positive relay is in the non-adhesion state; otherwise, it is determined that the main positive relay is in the pre-adhesion state.

[0053] Optionally, in some embodiments, when it is determined that the main positive relay is in the pre-adhesion state, the acquisition module is also used to: periodically collect the first front-end voltage and the first rear-end voltage within a second preset time period; when the absolute value of the difference between the first front-end voltage and the first rear-end voltage is less than or equal to the second preset voltage, it is determined that the main positive relay is in the adhesion state, and a main positive relay adhesion fault is sent to a preset mobile terminal; otherwise, the step of periodically collecting the first front-end voltage and the first rear-end voltage within the first preset time period is re-executed.

[0054] Optionally, in some embodiments, after collecting the second rear end voltage of the main positive relay, the first determination module is further configured to:

[0055] After a third preset time period, if the second rear-end voltage is greater than a third preset voltage, determining that the pre-filling relay is in the closed success state; otherwise, determining that the pre-filling relay is in the closed failure state;

[0056] When determining that the pre-charging relay is in the closed state, the first determining module is further configured to:

[0057] Periodically collecting the second rear-end voltage within a fourth preset time period;

[0058] If the second rear-end voltage is continuously greater than or equal to the fourth preset voltage within the fourth preset time period, the pre-filling relay is determined to be in the closed success state; otherwise, the pre-filling relay is determined to be in the closed failure state.

[0059] Optionally, in some embodiments, when determining that the pre-charging relay is in the closing failure state, the first determination module is further configured to:

[0060] Periodically collecting the second rear-end voltage within a fifth preset time period;

[0061] If the second back-end voltage continues to be less than or equal to the third preset voltage within the fifth preset time period, a pre-charge relay closure failure fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the second back-end voltage within the fourth preset time period is re-executed.

[0062] Optionally, in some embodiments, after collecting the third rear end voltage of the main negative relay, the first determination module is further configured to:

[0063] After a sixth preset time period, if the third rear end voltage is greater than a fifth preset voltage, determining that the main negative relay is in the non-adhesion state; otherwise, determining that the main negative relay is in the pre-adhesion state;

[0064] When determining that the main negative relay is in the non-adhesion state, the first determination module is further configured to:

[0065] Periodically collecting the third rear-end voltage within a seventh preset time period;

[0066] If the third rear-end voltage is continuously greater than or equal to the sixth preset voltage within the seventh preset time period, it is determined that the main negative relay is in the non-adhesion state; otherwise, it is determined that the main negative relay is in the pre-adhesion state.

[0067] Optionally, in some embodiments, when determining that the main negative relay is in the pre-adhesion state, the first determination module is further configured to:

[0068] Periodically collecting the third rear-end voltage within an eighth preset time period;

[0069] If the third back-end voltage continues to be less than or equal to the seventh preset voltage within the eighth preset time period, a main negative relay adhesion fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the third back-end voltage within the seventh preset time period is re-executed.

[0070] Optionally, in some embodiments, after collecting the fourth rear end voltage of the main positive relay, the second determination module is further configured to:

[0071] If the fourth rear-end voltage is less than an eighth preset voltage, it is determined that the pre-filling relay is in the disconnection success state; otherwise, it is determined that the pre-filling relay is in the disconnection failure state;

[0072] Wherein, in determining that the pre-charging relay is in the disconnection success state, the second determination module is specifically configured to:

[0073] Periodically collecting the fourth rear-end voltage within a ninth preset time period;

[0074] If the fourth rear-end voltage is continuously less than or equal to the ninth preset voltage within the ninth preset time period, the pre-filling relay is determined to be in the disconnection success state; otherwise, the pre-filling relay is determined to be in the disconnection failure state.

[0075] Optionally, in some embodiments, after determining that the pre-charging relay is in the disconnection failure state, the second determination module is further configured to:

[0076] Periodically collecting the fourth rear-end voltage within a tenth preset time period;

[0077] If the fourth back-end voltage continues to be greater than or equal to the tenth preset voltage within the tenth preset time period, a pre-charge relay disconnection failure fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the fourth back-end voltage within the ninth preset time period is re-executed.

[0078] A third aspect of the present application provides a power battery system, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the relay adhesion diagnosis method as described in the above embodiment.

[0079] Thus, the present application collects the first front-end voltage and the first rear-end voltage of the main positive relay of the fuse switch of the power battery system, and when it is determined that the main positive relay is in a non-adhesive state according to the first front-end voltage and the first rear-end voltage, closes the pre-fill relay, and collects the second rear-end voltage of the main positive relay, and when it is determined that the pre-fill relay is in a closed successful state according to the second rear-end voltage, collects the third rear-end voltage of the main negative relay, and when it is determined that the main negative relay is in a non-adhesive state according to the third rear-end voltage, disconnects the pre-fill relay, and collects the fourth rear-end voltage of the main positive relay, and when it is determined that the pre-fill relay is in a disconnected successful state according to the fourth rear-end voltage, it is determined that there is no adhesion at present. Thus, the present application effectively solves the problem that the adhesion diagnosis of the relay requires two high-voltage sampling circuits in the related art, resulting in a high cost of relay detection, and realizes the simultaneous detection of the main positive and main negative relays without adding additional electronic components.

[0080] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0082] FIG1 is a schematic diagram of a high-voltage relay adhesion detection circuit principle in the related art;

[0083] FIG2 is a schematic diagram of a relay adhesion detection circuit according to a specific embodiment of the present application;

[0084] FIG3 is a flow chart of a relay adhesion diagnosis method according to an embodiment of the present application;

[0085] FIG4 is a flow chart of a relay adhesion diagnosis method according to a specific embodiment of the present application;

[0086] FIG5 is a block diagram of a relay adhesion diagnosis device according to an embodiment of the present application;

[0087] FIG6 is a block diagram of a power battery system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0088] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0089] The relay adhesion diagnosis method and power battery system of the embodiment of the present application are described below with reference to the accompanying drawings. For the adhesion diagnosis of the relay mentioned in the above background technology, two high-voltage sampling circuits are required, which leads to the problem that the relay detection cost is high. The present application provides a relay adhesion diagnosis method, in which the first front-end voltage and the first rear-end voltage of the main positive relay are collected; when the main positive relay is judged to be in an unadhesive state according to the first front-end voltage and the first rear-end voltage, the pre-filled relay is closed, and the second rear-end voltage of the main positive relay is collected, and when the pre-filled relay is judged to be in a closed successful state according to the second rear-end voltage, the third rear-end voltage of the main negative relay is collected; when the main negative relay is judged to be in an unadhesive state according to the third rear-end voltage, the pre-filled relay is disconnected, and the fourth rear-end voltage of the main positive relay is collected, and when the pre-filled relay is judged to be in a disconnected successful state according to the fourth rear-end voltage, it is determined that there is no adhesion at present. Thus, the problem that the adhesion diagnosis of the relay requires two high-voltage sampling circuits in the related art, which leads to the problem that the relay detection cost is high, is solved, and the simultaneous detection of the main positive and main negative relays is realized without adding additional electronic components.

[0090] The traditional method of detecting whether the main negative relay of the high-voltage circuit of the battery system is stuck requires two high-voltage negative acquisition channels. Specifically, Figure 2 is a schematic diagram of the relay sticking detection circuit principle of a specific embodiment of the present application. As shown in Figure 2, taking the main negative relay front-end voltage HV_PACK_Ref as the reference point, HV_Acq_01 in Figure 2 is the battery voltage, HV_Acq_02 is the main positive relay front-end voltage, HV_Acq_03 is the main positive relay rear-end voltage, and HV_Acq_08 is the main negative relay rear-end voltage.

[0091] In the related art, HV_Acq_03 and HV_PACK_Ref are used to determine whether the main positive relay is stuck, and HV_Acq_08 and HV_Acq_01 form a high-voltage detection circuit to determine whether the main negative relay is stuck. That is to say, if there is high voltage between HV_Acq_08 and HV_Acq_01, such as the voltage difference is greater than 100V, it means that the main negative HV_PACK_Ref of the battery is connected to the rear end HV_Acq_08 of the negative relay. At this time, it is diagnosed as the negative relay is stuck.

[0092] However, the aforementioned methods for detecting relay adhesion require two high-voltage negative acquisition channels and two voltage reference points. These two detection loops incur additional detection costs. To address this issue, the present application utilizes only one high-voltage negative acquisition channel, a single voltage reference point, and a software strategy to detect whether the main negative relay is adhered, without incurring additional costs. The present invention's relay adhesion diagnosis method will be described below with reference to the accompanying drawings and specific examples.

[0093] Before introducing the embodiments of the present application, the schematic diagram of the relay adhesion diagnostic circuit of the embodiment of the present application is first introduced. As shown in Figure 2, the relay adhesion diagnostic circuit of the embodiment of the present application includes: a battery pack, a fuse, a main positive relay, a main negative relay, a pre-charge relay, and a pre-charge resistor; the embodiment of the present application uses the front-end voltage HV_PACK_Ref of the main negative relay as a reference point, HV_Acq_01 is the battery voltage, HV_Acq_02 is the front-end voltage of the main positive relay, HV_Acq_03 is the rear-end voltage of the main positive relay, and HV_Acq_08 is the rear-end voltage of the main negative relay.

[0094] For the sake of simplicity, in the following embodiments, HV_Acq_01 is referred to as V1, HV_Acq_02 is referred to as V2, HV_Acq_03 is referred to as V3, and HV_Acq_08 is referred to as V8. V1, V2, V3, and V8 are all voltages relative to the reference point HV_PACK_Ref.

[0095] The relay adhesion diagnosis method according to the embodiment of the present application will be described in detail below with reference to specific embodiments and accompanying drawings.

[0096] Specifically, FIG3 is a flow chart of a relay adhesion diagnosis method provided in an embodiment of the present application.

[0097] As shown in FIG3 , the relay adhesion diagnosis method includes the following steps:

[0098] In step S301 , a first front-end voltage and a first rear-end voltage of a main positive relay are collected.

[0099] As shown in FIG2 , the first front-end voltage of the main positive relay in the embodiment of the present application is V2, and the first rear-end voltage of the main positive relay is V3. Furthermore, the embodiment of the present application provides a fuse before the main positive relay, and the embodiment of the present application provides a safety switch, namely the fuse shown in FIG2 , in the main negative relay adhesion diagnosis circuit to provide overload protection. When the current exceeds a certain value, the circuit is promptly cut off to protect the circuit and other components from damage caused by the overload current.

[0100] It can be understood that the main negative relay adhesion diagnosis circuit of the embodiment of the present application can perform the relay self-test function after completing initialization. The embodiment of the present application first determines whether the main positive relay is adhered through the front-end voltage and rear-end voltage of the main positive relay.

[0101] Optionally, the embodiment of the present application can use a voltmeter to collect the values ​​of the front-end voltage and the rear-end voltage of the main positive relay, connect the positive pole of the voltmeter to the front-end position and the rear-end position of the main positive relay, and connect the negative pole to REF to ensure the stability and accuracy of the voltage in the circuit, and also help reduce noise and interference.

[0102] Optionally, in some embodiments, after collecting the first front-end voltage and the first rear-end voltage of the main positive relay, the method further includes: if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is greater than a first preset voltage, determining that the main positive relay is in a non-adhesion state; otherwise, determining that the main positive relay is in a pre-adhesion state;

[0103] Among them, when determining that the main positive relay is in a non-adhesion state, it also includes: periodically collecting the first front-end voltage and the first rear-end voltage within a first preset time length; if within the first preset time length, the absolute value of the difference between the first front-end voltage and the first rear-end voltage is continuously greater than the first preset voltage, then it is determined that the main positive relay is in a non-adhesion state, otherwise, it is determined that the main positive relay is in a pre-adhesion state.

[0104] It is understandable that, after collecting the first front-end voltage and the first rear-end voltage of the main positive relay, the embodiment of the present application needs to determine whether the main positive relay is stuck by the voltage difference between the two.

[0105] Preferably, the first preset voltage in the embodiment of the present application is 20V.

[0106] Specifically, as shown in Figure 2, the embodiment of the present application calculates the absolute value of the difference between the first front-end voltage and the first rear-end voltage |V3-V2|. When |V3-V2|>20V, it is determined that the main positive relay is not stuck, that is, the main positive relay is in a non-sticky state at this time, and the main positive relay circuit is not stuck, that is, both the main positive relay and the pre-charge relay are not stuck.

[0107] In some cases, as shown in Figure 2, in order to avoid misjudgment and ensure the adhesion state of the main positive relay, the embodiment of the present application periodically collects the voltage values ​​of V2 and V3 within a first preset time period. Within the first preset time period, if |V3-V2| is continuously greater than 20V, it is determined that the main positive relay is in a non-adhesion state, and subsequent judgment steps can be performed.

[0108] Preferably, the first preset duration in the embodiment of the present application is 30ms.

[0109] In other cases, the present application takes into account that the main positive relay may be experiencing relay aging or circuit failure, and when determining that the main positive relay is in a non-adhesion state, continues to determine whether the main positive relay is in a pre-adhesion state, that is, within the first preset time length, when |V3-V2| does not meet the condition of being continuously greater than 20V, it is determined that the main positive relay is in a pre-adhesion state at this time.

[0110] Optionally, in some embodiments, when determining that the main positive relay is in a pre-adhesion state, it also includes: periodically collecting the first front-end voltage and the first rear-end voltage within a second preset time length; if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is less than or equal to the second preset voltage, then determining that the main positive relay is in a adhesion state, and sending a main positive relay adhesion fault to a preset mobile terminal, otherwise, re-executing the step of periodically collecting the first front-end voltage and the first rear-end voltage within the first preset time length.

[0111] Based on the above embodiments, it can be understood that, as shown in Figure 2, the embodiment of the present application determines that the main positive relay is not stuck when |V3-V2|>20V. In other cases, |V3-V2| is instantaneously less than or equal to 20V, and it is impossible to accurately determine whether the main positive relay is in a stuck state. Therefore, the embodiment of the present application determines that the main positive relay is in a pre-sticking state, and then further confirms whether the main positive relay is stuck.

[0112] Preferably, the second preset time length in the embodiment of the present application is 1s, and the second preset voltage is 25V.

[0113] Specifically, as shown in Figure 2, when the main positive relay is determined to be in the pre-adhesion state, the embodiment of the present application continues to periodically collect the voltage values ​​of V2 and V3. Within 1s, when |V3-V2|≤25V, the main positive relay is determined to be in the adhesion state, that is, the main positive relay changes from the pre-adhesion state to the adhesion state. At this time, the embodiment of the present application needs to transmit the main positive relay adhesion fault information to a preset mobile terminal, such as a smart phone, smart watch and other devices, to promptly notify the user of the main positive relay adhesion fault, promptly troubleshoot the fault, and ensure the safety of the entire high-voltage circuit.

[0114] Furthermore, after reporting the main positive relay adhesion fault, the embodiment of the present application will end the relay self-test function, and the self-test counter of the embodiment of the present application remains at 0 and is not set to 1.

[0115] In other embodiments, the voltage values ​​of V2 and V3 are periodically collected. If |V3-V2|>25V within 1s, it is determined that the main positive relay is not stuck, that is, the main positive relay returns to the non-stick state.

[0116] Therefore, the embodiment of the present application collects the front-end voltage and the rear-end voltage of the main positive relay, and based on the voltage difference between the two, determines whether the main positive relay circuit (main positive relay and pre-charge relay) is in a sticking state or a pre-sticking state, thereby realizing the self-test function of the main positive relay. When a sticking fault occurs in the main positive relay circuit, the fault information is reported in time, effectively ensuring the safety of the entire high-voltage circuit.

[0117] In step S302, when the main positive relay is determined to be in a non-adhesive state based on the first front-end voltage and the first rear-end voltage, the pre-charge relay is closed and the second rear-end voltage of the main positive relay is collected, and when the pre-charge relay is determined to be in a successfully closed state based on the second rear-end voltage, the third rear-end voltage of the main negative relay is collected.

[0118] As shown in FIG2 , the third rear end voltage of the main positive relay in the embodiment of the present application is V3, and the fourth rear end voltage of the main negative relay is V8.

[0119] Based on the above embodiments, it can be understood that when the embodiment of the present application determines that the main positive relay is in a non-sticky state based on the first front-end voltage and the first rear-end voltage of the main positive relay, it is necessary to close the pre-charge relay and judge whether the pre-charge relay is closed successfully by the rear-end voltage of the main positive relay before the sticky state of the main negative relay can be detected.

[0120] Specifically, as shown in Figure 2, the embodiment of the present application closes the pre-charge relay and collects the voltage value of V3 again. When V3 meets the standard value set by the present application, it is determined that the pre-charge relay is closed successfully, and then the third rear end voltage of the main negative relay, that is, the voltage value of V8, is collected, and then the adhesion state of the main negative relay is detected.

[0121] It should be noted that, as shown in Figure 2, in the relay adhesion diagnosis circuit of the embodiment of the present application, the pre-charge relay is connected in series with the pre-charge group, so that the pre-charge relay will not be damaged by excessive current during startup, effectively protecting the pre-charge relay and other devices, and ensuring the safety and reliability of the entire diagnostic circuit.

[0122] Optionally, in some embodiments, after collecting the second rear end voltage of the main positive relay, the method further includes: after a third preset time period, if the second rear end voltage is greater than the third preset voltage, determining that the pre-filling relay is in a closed state, otherwise, determining that the pre-filling relay is in a closed state;

[0123] Among them, when determining that the pre-filling relay is in a successful closing state, it also includes: periodically collecting the second rear end voltage within a fourth preset time length; if within the fourth preset time length, the second rear end voltage is continuously greater than or equal to the fourth preset voltage, then it is determined that the pre-filling relay is in a successful closing state, otherwise, it is determined that the pre-filling relay is in a failed closing state.

[0124] Preferably, in the embodiment of the present application, the third preset time length is 50ms, the third preset voltage is 100V, the fourth preset time length is 30ms, and the fourth preset voltage is 90V.

[0125] Specifically, the embodiment of the present application collects the voltage value of V3 again. After 50ms, if V3>100V, it is determined that the pre-charging relay is closed successfully; otherwise, it is determined that the pre-charging relay fails to close.

[0126] It can be understood that, as shown in Figure 2, in order to avoid misjudgment and ensure that the pre-filling relay is closed successfully, the embodiment of the present application periodically collects the voltage value of V3 within the fourth preset time length. If V3 ≥ 90V within 30ms, it is determined that the pre-filling relay is in a successful closing state; otherwise, it is determined that the pre-filling relay is in a failed closing state.

[0127] Optionally, in some embodiments, when it is determined that the pre-charging relay is in a closing failure state, it also includes: periodically collecting the second back-end voltage within a fifth preset time length; if the second back-end voltage is continuously less than or equal to the third preset voltage within the fifth preset time length, then sending a pre-charging relay closing failure fault to a preset mobile terminal, otherwise, re-executing the step of periodically collecting the second back-end voltage within the fourth preset time length.

[0128] Preferably, the fifth preset time length of the embodiment of the present application is 290ms, and the third preset voltage is 100V.

[0129] It can be understood that after determining that the pre-charging relay is in a closing failure state, in order to ensure that the pre-charging relay fails to close, the embodiment of the present application periodically collects the voltage value of V3. Within 290ms, if V3 is continuously less than or equal to 100V, that is, the pre-charging relay is continuously in a closing failure state, then it can be determined that the pre-charging relay has failed to close. At this time, the fault information of the pre-charging relay failure to close needs to be sent to the preset mobile terminal to promptly inform the user of the information that the pre-charging relay failed to close, to promptly troubleshoot the problem, and to ensure the safety of the high-voltage circuit.

[0130] Furthermore, after the embodiment of the present application determines that the pre-charging relay fails to close and reports the fault information, the self-test counter of the embodiment of the present application remains at 0 and is not set to 1.

[0131] In other embodiments, the embodiments of the present application periodically collect the voltage value of V3. If the voltage value of V3 instantaneously meets the requirement of being greater than 100V within 290ms, the pre-charge relay returns to the state of successful closure, and then collects the fourth rear end voltage (V8) of the main negative relay.

[0132] Therefore, the embodiment of the present application closes the pre-charging relay, periodically collects the rear end voltage value of the main positive relay, and compares it with the calibration value to determine whether the pre-charging relay is closed successfully, thereby continuing to detect the adhesion state of the main negative relay.

[0133] Optionally, in some embodiments, after collecting the third rear end voltage of the main negative relay, the method further includes: after a sixth preset time period, if the third rear end voltage is greater than a fifth preset voltage, determining that the main negative relay is in a non-adhesion state; otherwise, determining that the main negative relay is in a pre-adhesion state;

[0134] Among them, when determining that the main negative relay is in a non-adhesion state, it also includes: periodically collecting the third rear-end voltage within the seventh preset time length; if the third rear-end voltage is continuously greater than or equal to the sixth preset voltage within the seventh preset time length, then it is determined that the main negative relay is in a non-adhesion state, otherwise, it is determined that the main negative relay is in a pre-adhesion state.

[0135] Preferably, in the embodiment of the present application, the sixth preset time length is 30ms, the fifth preset voltage is 20V, the seventh preset time length is 30ms, and the sixth preset voltage is 10V.

[0136] Based on the above embodiment, it can be understood that the embodiment of the present application can only continue to collect the third rear end voltage of the main negative relay, that is, V8 in Figure 2, after determining that the pre-charge relay is successfully closed. Then, the voltage value of V8 is compared with the calibration value to determine whether the main negative relay is stuck.

[0137] Specifically, within the first preset time length (30ms), when V8>20V, it is determined that the main negative relay is in a non-sticky state; otherwise, within 30ms, when V8≤20V, it is determined that the main negative relay is in a sticky state.

[0138] It can be understood that in order to avoid misjudgment and ensure the adhesion state of the main negative relay, the embodiment of the present application periodically collects the voltage value of V8 within the seventh preset time length, that is, within 30ms. If V8 is continuously greater than or equal to 10V within 30ms, it is determined that the main negative relay is not adhered.

[0139] In other embodiments, when V8 is momentarily less than 10V within 30 ms, it is determined that the main negative relay is in the pre-sticking state.

[0140] Optionally, in some embodiments, when determining that the main negative relay is in a pre-adhesion state, it also includes: periodically collecting the third rear-end voltage within an eighth preset time length; if the third rear-end voltage is continuously less than or equal to the seventh preset voltage within the eighth preset time length, then sending the main negative relay adhesion fault to the preset mobile terminal, otherwise, re-executing the step of periodically collecting the third rear-end voltage within the seventh preset time length.

[0141] Preferably, the eighth preset time length of the embodiment of the present application is 290ms, and the seventh preset voltage is 20V.

[0142] It is understandable that when determining that the main negative relay is in a pre-adhesion state, the embodiment of the present application needs to determine whether the main negative relay is adhered.

[0143] Specifically, the embodiment of the present application periodically collects the third back-end voltage (V8) within 290ms. When V8 is continuously less than or equal to 20V, it is determined that a adhesion fault occurs in the main negative relay. Thus, the embodiment of the present application sends the main negative relay adhesion fault information to the preset mobile terminal to promptly notify the user of the fault information.

[0144] In other embodiments, within 290ms, V8 is instantaneously greater than 20V, and the main negative relay changes from a pre-adhesion state to a non-adhesion state.

[0145] Therefore, in the embodiment of the present application, when the pre-charge relay is successfully closed and it is determined that the main positive relay is not stuck, the rear end voltage of the main negative relay is detected and compared with the calibration value to draw a conclusion on whether the main negative relay is stuck, thereby realizing the self-test function of the main negative relay and effectively ensuring the safety and reliability of the high-voltage circuit.

[0146] In step S303, when the main negative relay is determined to be in a non-adhesion state based on the third rear-end voltage, the pre-charge relay is disconnected, and the fourth rear-end voltage of the main positive relay is collected, and when the pre-charge relay is determined to be in a successful disconnection state based on the fourth rear-end voltage, it is determined that there is no adhesion at present.

[0147] Among them, the fourth rear end voltage of the main positive relay in the embodiment of the present application is V3.

[0148] It can be understood that when the embodiment of the present application determines that the main negative relay is in a non-sticky state based on the third rear-end voltage, an instruction to disconnect the pre-charging relay is executed, and then it is necessary to determine whether the pre-charging relay is successfully disconnected.

[0149] Optionally, in some embodiments, after collecting the fourth rear end voltage of the main positive relay, the method further includes: if the fourth rear end voltage is less than an eighth preset voltage, determining that the pre-filling relay is in a disconnection success state; otherwise, determining that the pre-filling relay is in a disconnection failure state;

[0150] Among them, determining whether the pre-charging relay is in a successful disconnection state includes: periodically collecting the fourth rear-end voltage within a ninth preset time period; if the fourth rear-end voltage is continuously less than or equal to the ninth preset voltage within the ninth preset time period, then determining that the pre-charging relay is in a successful disconnection state, otherwise, determining that the pre-charging relay is in a failed disconnection state.

[0151] Preferably, in the embodiment of the present application, the eighth preset voltage is 100V, the ninth preset time is 50ms, and the ninth preset voltage is 500V.

[0152] It can be understood that the embodiment of the present application compares V3 with the eighth preset voltage. When V3<100V, it is determined that the pre-charging relay is disconnected successfully; otherwise, it is determined that the pre-charging relay is disconnected unsuccessfully.

[0153] Specifically, the embodiment of the present application periodically collects the fourth back-end voltage (V3). If V3 is continuously less than or equal to 500V within 50ms, it is determined that the pre-charging relay is in a successful disconnection state. At this time, the self-test counter needs to be set to 1; otherwise, that is, if V3 is instantaneously greater than 500V, it is determined that the pre-charging relay is in a failed disconnection state.

[0154] Optionally, in some embodiments, after determining that the pre-charging relay is in a disconnection failure state, it also includes: periodically collecting the fourth back-end voltage within a tenth preset time length; if the fourth back-end voltage continues to be greater than or equal to the tenth preset voltage within the tenth preset time length, then sending a pre-charging relay disconnection failure fault to a preset mobile terminal, otherwise, re-executing the step of periodically collecting the fourth back-end voltage within the ninth preset time length.

[0155] Preferably, the tenth preset time length in the embodiment of the present application is 2s, and the tenth preset voltage is 490V.

[0156] Specifically, in order to determine the status of the pre-charging relay, the embodiment of the present application periodically collects the voltage value of V3 within 2s. If V3 is continuously greater than or equal to 490V within 2s, it is determined that the pre-charging relay has failed to disconnect, and the fault information of the pre-charging relay failure to disconnect is sent to the preset mobile terminal to promptly notify the user of the fault information, thereby avoiding safety hazards caused by the pre-charging relay disconnection failure.

[0157] Furthermore, after determining that the pre-charging relay fails to disconnect, the embodiment of the present application will end the self-test function and keep the self-test counter at 0, and not set it to 1.

[0158] In other cases, within 2 seconds, when V3 is instantaneously less than 490V, the state returns to the state where the pre-charge relay is successfully disconnected.

[0159] It should be noted that the tenth preset voltage in the embodiment of the present application is 490V, which is to prevent the slow discharge speed caused by special working conditions from being misjudged as a adhesion fault, thereby further improving the accuracy of the relay self-test results.

[0160] Therefore, after determining that the main negative relay is stuck, the embodiment of the present application executes the instruction to disconnect the pre-fill relay, and compares the rear end voltage value of the main positive relay with the calibration value to determine whether the pre-fill relay is successfully disconnected.

[0161] Based on the above embodiments, after the relay self-test function of the embodiment of the present application is completed, a relay adhesion status diagnosis result can be generated. Those skilled in the art can simultaneously detect whether the main positive relay and the main negative relay are adhered based on the relay adhesion diagnosis method of the embodiment of the present application. After the relay self-test passes, the self-test counter is set to 1, and then the embodiment of the present application can enter the high-voltage power on and off, fast charging, slow charging and other processes according to the BMU (Battery Management Unit) status.

[0162] Optionally, the implementation logic of the relay adhesion diagnosis method of the present application is shown in FIG4 , which is a flow chart of the relay adhesion diagnosis method of a specific embodiment of the present application. As shown in FIG4 , the method may include the following steps:

[0163] Step S401, determining whether the main positive relay is stuck. If the main positive relay is not stuck, executing step S403; otherwise, executing step S402;

[0164] Step S402: reporting the main positive relay adhesion fault information to the user terminal, and ending the process;

[0165] Step S403, closing the pre-charge relay;

[0166] Step S404, determining whether the pre-filling relay is closed successfully, if the pre-filling relay is closed successfully, executing step S406, otherwise executing step S405;

[0167] Step S405: reporting the pre-charge relay closing failure information to the user terminal, and ending the process;

[0168] Step S406, determining whether the main negative relay is stuck. If the main negative relay is not stuck, executing step S408; otherwise, executing step S407;

[0169] Step S407: reporting the main negative relay adhesion fault information to the user terminal, and ending the process;

[0170] Step S408, disconnecting the pre-charge relay;

[0171] Step S409, determining whether the pre-filling relay is disconnected successfully, if the pre-filling relay is disconnected successfully, then the process ends, otherwise, step S410 is executed;

[0172] Step S410: reporting the pre-charging relay disconnection failure information to the user terminal, and ending the process.

[0173] Therefore, the relay adhesion diagnosis method of the present application can realize the relay self-test function. After the pre-charge relay is closed and the battery voltage passes through the load, there should be voltage at the rear end of the main negative relay. Based on this, it can be determined whether the main negative relay is adhered (the dotted box part in Figure 4).

[0174] In order to enable those skilled in the art to further understand the relay adhesion diagnosis method of the present application, the following examples are listed in conjunction with the accompanying drawings to specifically illustrate the execution steps of the method.

[0175] Specifically, as shown in FIG2 , in the embodiment of the present application, the battery voltage HV_Acq_01 is referred to as V1, the main positive relay front-end voltage HV_Acq_02 is referred to as V2, the main positive relay rear-end voltage HV_Acq_03 is referred to as V3, and the main negative relay rear-end voltage HV_Acq_08 is referred to as V8. The above voltages are all relative to the reference point of the main negative relay front-end voltage HV_PACK_Ref. The relay sticking diagnosis method of the embodiment of the present application can be divided into the following steps:

[0176] Step 1: After low voltage power-up, perform self-test, first check whether the main positive relay is sticking.

[0177] (1) If the voltage difference between V3 and V2 is greater than 20V (calibrated value), it is judged that the main positive circuit (main positive relay or pre-charge relay) is not adhered. If the voltage difference between V3 and V2 is less than or equal to 20V, it is judged that the main positive relay is pre-adhesive.

[0178] (2) After the main positive relay is in the non-adhesive state for 30ms, the second step is to close the pre-charge relay. During the waiting period, if the voltage difference between V3 and V2 is less than 20V, the main positive relay enters the pre-adhesive state;

[0179] (3) In the pre-adhesion state, if the voltage difference between V3 and V2 is less than or equal to 25V within 1s, it is determined that the main positive circuit is adhered, and the main positive relay adhesion fault is reported, and then the self-test is terminated, but the self-test counter remains at 0 and is not set to 1; otherwise, if during this period, the voltage difference between V3 and V2 is momentarily greater than 25V (calibrated value), it returns to the "main positive relay is not adhered" state.

[0180] Step 2: Close the pre-charge relay and determine whether the pre-charge relay is closed successfully by checking whether the V3 voltage is greater than 100V (calibration value).

[0181] (1) After the pre-charge relay command is closed for 50ms, if V3 is greater than 100V, it is judged that the pre-charge closure is successful; if V3 is less than or equal to 100V, it is judged that the closure fails;

[0182] (2) After the closing success state lasts for 30ms, proceed to the third step and start the main negative relay adhesion detection. During the 30ms confirmation period, if the V3 voltage is instantaneously less than 90V, the closing failure state is entered;

[0183] (3) When the pre-charge relay fails to close, if V3 is continuously less than 100V within 290ms, the pre-charge relay closing failure is reported and the self-test ends, but the self-test counter remains at 0 and is not set to 1; otherwise, if the V3 voltage is momentarily greater than 100V within 290ms, the state returns to "pre-charge closing success".

[0184] Step 3: After the pre-charge relay is closed successfully, determine whether the main negative relay is stuck by detecting whether the V8 voltage is greater than 20V (calibration value).

[0185] (1) After the pre-charge relay is closed successfully for 30ms, if the V8 voltage is greater than 20V (calibrated value), it is judged that the main negative relay is not stuck; if V8 is less than or equal to 20V, it is judged as "main negative relay pre-sticking";

[0186] (2) If the main negative relay is not in the sticking state for 30ms, you can proceed to the next step (disconnect the pre-charge relay, self-test is completed, etc., step 4). If the V8 voltage is momentarily less than 10V during the 30ms period, the system enters the "main negative relay pre-sticking" state;

[0187] (3) In the "main negative relay pre-adhesion" state, if V8 is continuously less than or equal to 20V within 290ms, the main negative relay adhesion fault is reported and the self-test is terminated, but the self-test counter remains at 0 and is not set to 1; otherwise, if the V8 voltage is momentarily greater than 20V during this 290ms period, the state returns to the "main negative relay non-adhesion" state.

[0188] Step 4: After the main negative relay is successfully judged to be stuck, that is, the main negative relay is not stuck, after 30ms, the instruction to disconnect the pre-charge relay is executed, and then the V3 voltage is judged to be less than 100V (calibration value) to determine whether the pre-charge relay is disconnected successfully.

[0189] (1) If V3 is less than 100V, it is determined that the pre-charge relay is disconnected successfully; if V3 is greater than or equal to 100V, it is determined that the pre-charge relay fails to disconnect;

[0190] (2) When the pre-charge relay disconnection success state lasts for 50ms, the self-test counter is set to 1; otherwise, if the V3 voltage is momentarily greater than 500V within this 50ms duration, the state of "pre-charge relay disconnection failure" is entered;

[0191] (3) In the "pre-charge relay disconnection failure" state, if the V3 voltage is continuously greater than or equal to 490V within 2s, the pre-charge relay disconnection fault is reported and the self-test is terminated, but the self-test counter remains at 0 and is not set to 1; otherwise, if the V3 voltage is momentarily less than 490V within this 2s duration, the state returns to the "pre-charge relay disconnection success" state.

[0192] After the above four steps, the self-test is completed. After the self-test passes, the self-test counter is set to 1. According to the BMU status, the high-voltage power on and off, fast charging, slow charging and other processes can be entered.

[0193] Therefore, the relay sticking diagnosis method proposed in this application uses the voltage at the front end of the main negative relay as a reference point. After closing the pre-charge relay, the voltage at the rear end of the main negative relay relative to the reference point is detected to determine whether the main negative relay is stuck. In addition, the implementation of the method in this application does not require the addition of additional electronic components. The implementation method utilizes a software strategy to improve the accuracy of relay sticking detection while reducing costs.

[0194] According to the relay adhesion diagnosis method proposed in the embodiment of the present application, by collecting the first front-end voltage and the first rear-end voltage of the main positive relay, when the main positive relay is judged to be in a non-adhesive state according to the first front-end voltage and the first rear-end voltage, the pre-fill relay is closed, and the second rear-end voltage of the main positive relay is collected, and when the pre-fill relay is judged to be in a closed state successfully according to the second rear-end voltage, the third rear-end voltage of the main negative relay is collected, and when the main negative relay is judged to be in a non-adhesive state according to the third rear-end voltage, the pre-fill relay is disconnected, and the fourth rear-end voltage of the main positive relay is collected, and when the pre-fill relay is judged to be in a disconnected state successfully according to the fourth rear-end voltage, it is determined that there is no adhesion at present. Therefore, the present application effectively solves the problem that the adhesion diagnosis of the relay requires two high-voltage sampling circuits in the related art, resulting in a high cost of relay detection, and realizes the simultaneous detection of the main positive and main negative relays without adding additional electronic components.

[0195] Next, a relay adhesion diagnosis device according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0196] FIG5 is a block diagram of a relay adhesion diagnosis device according to an embodiment of the present application.

[0197] As shown in FIG5 , the relay adhesion diagnosis device 10 includes: an acquisition module 100 , a first determination module 200 and a second determination module 300 .

[0198] Specifically, the acquisition module 100 is used to collect the first front-end voltage and the first rear-end voltage of the main positive relay; the first judgment module 200 is used to close the pre-filling relay and collect the second rear-end voltage of the main positive relay when it is determined that the main positive relay is in a non-adhesion state based on the first front-end voltage and the first rear-end voltage, and collect the third rear-end voltage of the main negative relay when it is determined that the pre-filling relay is in a successfully closed state based on the second rear-end voltage; the second judgment module 300 is used to disconnect the pre-filling relay and collect the fourth rear-end voltage of the main positive relay when it is determined that the main negative relay is in a non-adhesion state based on the third rear-end voltage, and determine that there is no adhesion at present when it is determined that the pre-filling relay is in a successfully disconnected state based on the fourth rear-end voltage.

[0199] Optionally, in some embodiments, after collecting the first front-end voltage and the first rear-end voltage of the main positive relay, the collection module 100 is further configured to: determine that the main positive relay is in a non-adhesion state if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is greater than a first preset voltage; otherwise, determine that the main positive relay is in a pre-adhesion state;

[0200] Among them, when it is determined that the main positive relay is in a non-adhesion state, the acquisition module 100 is also used to: periodically collect the first front-end voltage and the first rear-end voltage within a first preset time length; within the first preset time length, if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is continuously greater than the first preset voltage, it is determined that the main positive relay is in a non-adhesion state; otherwise, it is determined that the main positive relay is in a pre-adhesion state.

[0201] Optionally, in some embodiments, when it is determined that the main positive relay is in a pre-adhesion state, the acquisition module 100 is also used to: periodically collect the first front-end voltage and the first rear-end voltage within a second preset time period; when the absolute value of the difference between the first front-end voltage and the first rear-end voltage is less than or equal to the second preset voltage, it is determined that the main positive relay is in a adhesion state, and a main positive relay adhesion fault is sent to a preset mobile terminal; otherwise, the step of periodically collecting the first front-end voltage and the first rear-end voltage within the first preset time period is re-executed.

[0202] Optionally, in some embodiments, after collecting the second rear end voltage of the main positive relay, the first judgment module 200 is further used to: after a third preset time, if the second rear end voltage is greater than the third preset voltage, determine that the pre-filling relay is in a successful closing state; otherwise, determine that the pre-filling relay is in a failed closing state; wherein, when determining that the pre-filling relay is in a successful closing state, the first judgment module 200 is further used to: periodically collect the second rear end voltage within a fourth preset time; within the fourth preset time, if the second rear end voltage is continuously greater than or equal to the fourth preset voltage, determine that the pre-filling relay is in a successful closing state; otherwise, determine that the pre-filling relay is in a failed closing state.

[0203] Optionally, in some embodiments, when it is determined that the pre-charging relay is in a closing failure state, the first determination module 200 is further used to: periodically collect the second back-end voltage within a fifth preset time period; if the second back-end voltage is continuously less than or equal to the third preset voltage within the fifth preset time period, send a pre-charging relay closing failure fault to a preset mobile terminal; otherwise, re-execute the step of periodically collecting the second back-end voltage within the fourth preset time period.

[0204] Optionally, in some embodiments, after collecting the third rear end voltage of the main negative relay, the first judgment module 200 is further used to: after the sixth preset time, if the third rear end voltage is greater than the fifth preset voltage, determine that the main negative relay is in a non-adhesion state; otherwise, determine that the main negative relay is in a pre-adhesion state; wherein, when determining that the main negative relay is in a non-adhesion state, the first judgment module 200 is further used to: periodically collect the third rear end voltage within a seventh preset time; within the seventh preset time, if the third rear end voltage is continuously greater than or equal to the sixth preset voltage, determine that the main negative relay is in a non-adhesion state; otherwise, determine that the main negative relay is in a pre-adhesion state.

[0205] Optionally, in some embodiments, when it is determined that the main negative relay is in a pre-adhesion state, the first determination module 200 is also used to: periodically collect the third rear-end voltage within an eighth preset time period; if the third rear-end voltage is continuously less than or equal to the seventh preset voltage within the eighth preset time period, send a main negative relay adhesion fault to a preset mobile terminal; otherwise, re-execute the step of periodically collecting the third rear-end voltage within the seventh preset time period.

[0206] Optionally, in some embodiments, after collecting the fourth rear-end voltage of the main positive relay, the second determination module 300 is further used to: determine that the pre-filling relay is in a successful disconnection state when the fourth rear-end voltage is less than the eighth preset voltage; otherwise, determine that the pre-filling relay is in a failed disconnection state; wherein, to determine that the pre-filling relay is in a successful disconnection state, the second determination module 300 is specifically used to: periodically collect the fourth rear-end voltage within a ninth preset time length; within the ninth preset time length, if the fourth rear-end voltage is continuously less than or equal to the ninth preset voltage, determine that the pre-filling relay is in a successful disconnection state; otherwise, determine that the pre-filling relay is in a failed disconnection state.

[0207] Optionally, in some embodiments, after determining that the pre-charging relay is in a disconnection failure state, the second determination module 300 is further used to: periodically collect the fourth back-end voltage within a tenth preset time period; if the fourth back-end voltage continues to be greater than or equal to the tenth preset voltage within the tenth preset time period, send a pre-charging relay disconnection failure fault to a preset mobile terminal; otherwise, re-execute the step of periodically collecting the fourth back-end voltage within the ninth preset time period.

[0208] It should be noted that the aforementioned explanation of the embodiment of the relay adhesion diagnosis method is also applicable to the relay adhesion diagnosis device of this embodiment, and will not be repeated here.

[0209] According to the relay adhesion diagnosis device proposed in the embodiment of the present application, by collecting the first front-end voltage and the first rear-end voltage of the main positive relay, when it is determined that the main positive relay is in a non-adhesive state according to the first front-end voltage and the first rear-end voltage, the pre-fill relay is closed, and the second rear-end voltage of the main positive relay is collected, and when it is determined that the pre-fill relay is in a closed state successfully according to the second rear-end voltage, the third rear-end voltage of the main negative relay is collected, and when it is determined that the main negative relay is in a non-adhesive state according to the third rear-end voltage, the pre-fill relay is disconnected, and the fourth rear-end voltage of the main positive relay is collected, and when it is determined that the pre-fill relay is in a disconnected state successfully according to the fourth rear-end voltage, it is determined that there is no adhesion at present. Therefore, the present application effectively solves the problem that the adhesion diagnosis of the relay requires two high-voltage sampling circuits in the related art, resulting in a high cost of relay detection, and realizes the simultaneous detection of the main positive and main negative relays without adding additional electronic components.

[0210] FIG6 is a schematic diagram of the structure of a power battery system provided in an embodiment of the present application. The power battery system may include:

[0211] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0212] When the processor 602 executes the program, the relay sticking diagnosis method provided in the above embodiment is implemented.

[0213] Furthermore, the power battery system further includes:

[0214] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0215] The memory 601 is used to store computer programs that can be run on the processor 602 .

[0216] The memory 601 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0217] If the memory 601, processor 602, and communication interface 603 are implemented independently, the communication interface 603, memory 601, and processor 602 can be interconnected via a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus. Buses can be divided into address buses, data buses, control buses, etc. For ease of illustration, FIG6 shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0218] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0219] The processor 602 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0220] It should be noted that the device and power battery system provided in the embodiments of the present application are used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0221] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0222] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0223] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing a custom logical function or process step, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed in a different order than shown or discussed, including performing functions in a substantially simultaneous manner or in a reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0224] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, it can be implemented using any one or a combination of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0225] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0226] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A relay adhesion diagnosis method, characterized in that: The following steps are involved: collecting a first front-end voltage and a first rear-end voltage of a main positive relay; When it is determined that the main positive relay is in a non-sticky state according to the first front-end voltage and the first rear-end voltage, closing the pre-filling relay and collecting the second rear-end voltage of the main positive relay; and when it is determined that the pre-filling relay is in a closed state according to the second rear-end voltage, collecting the third rear-end voltage of the main negative relay; as well as When it is determined that the main negative relay is in the non-adhesion state based on the third rear-end voltage, the pre-filling relay is disconnected, and the fourth rear-end voltage of the main positive relay is collected. When it is determined that the pre-filling relay is in the successful disconnection state based on the fourth rear-end voltage, it is determined that there is no adhesion at present.

2. The method according to claim 1, characterized in that After acquiring the first front-end voltage and the first rear-end voltage of the main positive relay, the method further includes: If the absolute value of the difference between the first front-end voltage and the first rear-end voltage is greater than a first preset voltage, it is determined that the main positive relay is in the non-adhesion state; otherwise, it is determined that the main positive relay is in the pre-adhesion state; When it is determined that the main positive relay is in the non-adhesion state, the method further includes: Periodically collecting the first front-end voltage and the first back-end voltage within a first preset time period; If the absolute value of the difference between the first front-end voltage and the first rear-end voltage is continuously greater than the first preset voltage within the first preset time period, it is determined that the main positive relay is in the non-adhesion state; otherwise, it is determined that the main positive relay is in the pre-adhesion state.

3. The method according to claim 2, characterized in that When it is determined that the main positive relay is in the pre-adhesion state, the method further includes: The first front-end voltage and the first rear-end voltage are periodically collected within a second preset time period; if the absolute value of the difference between the first front-end voltage and the first rear-end voltage is less than or equal to the second preset voltage, it is determined that the main positive relay is in a sticking state, and a main positive relay sticking fault is sent to a preset mobile terminal; otherwise, the step of periodically collecting the first front-end voltage and the first rear-end voltage within the first preset time period is re-executed.

4. The method according to claim 1, wherein After collecting the second rear end voltage of the main positive relay, the method further includes: After a third preset time period, if the second rear-end voltage is greater than a third preset voltage, it is determined that the pre-filling relay is in the closed success state; otherwise, it is determined that the pre-filling relay is in the closed failure state; When it is determined that the pre-charging relay is in the closed state, the method further includes: Periodically collecting the second rear-end voltage within a fourth preset time period; If the second rear-end voltage is continuously greater than or equal to the fourth preset voltage within the fourth preset time period, it is determined that the pre-filling relay is in the closed success state; otherwise, it is determined that the pre-filling relay is in the closed failure state.

5. The method according to claim 4, characterized in that When it is determined that the pre-charging relay is in the closing failure state, the method further includes: Periodically collecting the second rear-end voltage within a fifth preset time period; If the second back-end voltage continues to be less than or equal to the third preset voltage within the fifth preset time period, a pre-charge relay closure failure fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the second back-end voltage within the fourth preset time period is re-executed.

6. The method according to claim 1, characterized in that After collecting the third rear end voltage of the main negative relay, the method further includes: After a sixth preset time period, if the third rear end voltage is greater than a fifth preset voltage, it is determined that the main negative relay is in the non-adhesion state; otherwise, it is determined that the main negative relay is in the pre-adhesion state; Wherein, when determining that the main negative relay is in the non-adhesion state, the method further includes: Periodically collecting the third rear-end voltage within a seventh preset time period; If the third rear-end voltage is continuously greater than or equal to the sixth preset voltage within the seventh preset time period, it is determined that the main negative relay is in the non-adhesion state; otherwise, it is determined that the main negative relay is in the pre-adhesion state.

7. The method according to claim 6, characterized in that When it is determined that the main negative relay is in the pre-adhesion state, the method further includes: Periodically collecting the third rear-end voltage within an eighth preset time period; If the third rear-end voltage is continuously less than or equal to the seventh preset voltage within the eighth preset time length, the main negative relay adhesion fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the third rear-end voltage within the seventh preset time length is re-executed.

8. The method according to claim 1, characterized in that After collecting the fourth rear end voltage of the main positive relay, the method further includes: If the fourth rear-end voltage is less than the eighth preset voltage, it is determined that the pre-filling relay is in the disconnection success state; otherwise, it is determined that the pre-filling relay is in the disconnection failure state; Wherein, determining that the pre-charging relay is in the disconnection success state includes: Periodically collecting the fourth rear-end voltage within a ninth preset time period; If the fourth rear-end voltage is continuously less than or equal to the ninth preset voltage within the ninth preset time period, it is determined that the pre-filling relay is in the disconnection success state; otherwise, it is determined that the pre-filling relay is in the disconnection failure state.

9. The method according to claim 8, characterized in that After determining that the pre-charging relay is in the disconnection failure state, the method further includes: Periodically collecting the fourth rear-end voltage within a tenth preset time period; If the fourth back-end voltage continues to be greater than or equal to the tenth preset voltage within the tenth preset time period, the pre-charging relay disconnection failure fault is sent to the preset mobile terminal; otherwise, the step of periodically collecting the fourth back-end voltage within the ninth preset time period is re-executed.

10. A power battery system, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the relay adhesion diagnosis method according to any one of claims 1 to 9.

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