Contactor adhesion detection circuit and vehicle

Abstract

The utility model relates to a contactor adhesion detection circuit and a vehicle, the contactor adhesion detection circuit comprises a battery module, a first contactor module, a second contactor module, a resistance branch and a plurality of voltage sampling circuits, and a charging assembly can perform direct current fast charging on the battery module through the first contactor module and the second contactor module. The resistor branch is used for providing bias voltage to facilitate follow-up contactor adhesion detection, the voltage sampling circuits can be powered by the same auxiliary power supply through common ground, and the cost is reduced while the circuit is simplified.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a contactor adhesion detection circuit and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the market share of electric vehicles is increasing; as one of the important functions of electric vehicles, especially passenger vehicles, fast charging has attracted much attention for its safety. When fast charging electric vehicles, it is necessary to detect the switch state of the fast charging contactor, identify the adhesion state of the fast charging contactor and report the fault to avoid the fast charging contactor adhesion after the fast charging is completed, resulting in high voltage at the fast charging port, which may cause electric shock to the human body.

[0003] In the prior art, in order to detect the adhesion state of the contactor, multiple sampling chips are often set up to detect the voltage at both ends of the positive and negative ports of the fast charging port and the voltage at the positive and negative ends of the battery, and compare them to determine the state of the contactor. However, multiple auxiliary power supplies need to be set up separately to power the sampling chips, which results in a relatively complex circuit and high cost. Summary of the invention

[0004] Based on this, it is necessary to provide a contactor adhesion detection circuit and a vehicle that can simplify the circuit and reduce the cost.

[0005] In a first aspect, the present application provides a contactor adhesion detection circuit, comprising:

[0006] Battery module;

[0007] A first contactor module, one end of the first contactor module is connected to the battery module, and the other end of the first contactor module is used to connect to the charging component;

[0008] A second contactor module, one end of the second contactor module is connected to the battery module, and the other end of the second contactor module is used to connect to the charging assembly;

[0009] A resistance branch, wherein a first end of the resistance branch is connected between the second contactor module and the charging assembly, a second end of the resistance branch is used to connect an auxiliary power supply, and a third end of the resistance branch is used to be grounded;

[0010] A plurality of voltage sampling circuits, wherein the first end of each voltage sampling circuit is respectively connected to a corresponding sampling point, the second end of each voltage sampling circuit is connected to an auxiliary power supply, and the third end of each voltage sampling circuit is commonly grounded.

[0011] In one embodiment, the resistance branch includes a first resistor and a second resistor;

[0012] One end of the first resistor is connected between the second contactor module and the charging assembly, and connected to one end of the second resistor, and the other end of the first resistor is used to connect to the auxiliary power supply;

[0013] One end of the second resistor is connected between the second contactor module and the charging component, and the other end of the second resistor is used for grounding.

[0014] In one embodiment, the first resistor and the second resistor are both voltage-dividing resistors.

[0015] In one embodiment, the contactor sticking detection circuit further includes:

[0016] The filter circuit has an input end connected to a first output end and a second output end of the vehicle charger, and an output end of the filter circuit is connected to a battery module.

[0017] In one of the embodiments, the plurality of voltage sampling circuits include a first sampling circuit, a second sampling circuit, and a third sampling circuit;

[0018] The first end of the first sampling circuit is connected between the input end of the filter circuit and the first output end of the on-board charger, the second end of the first sampling circuit is used to connect the auxiliary power supply, and the third end of the first sampling circuit is used to be grounded;

[0019] The first end of the second sampling circuit is connected between the other end of the first contactor module and the charging assembly, the second end of the second sampling circuit is used to connect the auxiliary power supply, and the third end of the second sampling circuit is used to ground;

[0020] The first end of the third sampling circuit is connected between the other end of the second contactor module and the charging assembly, the second end of the third sampling circuit is used to connect to the auxiliary power supply, and the third end of the third sampling circuit is used to be grounded.

[0021] In one of the embodiments, the voltage sampling circuit includes a sampling chip, a third resistor, a fourth resistor and a fifth resistor;

[0022] One end of the third resistor is connected to the corresponding sampling point, and the other end of the third resistor is connected in series with one end of the fourth resistor;

[0023] The first input terminal of the sampling chip is connected between the third resistor and the fourth resistor, the second input terminal of the sampling chip is connected to the other end of the fourth resistor and then grounded, the negative power terminal of the sampling chip is connected to the second input terminal of the sampling chip, and the positive power terminal of the sampling chip is used to connect to the auxiliary power supply;

[0024] The fifth resistor is connected between the output terminal of the sampling chip and the first input terminal of the sampling chip.

[0025] In one embodiment, the filter circuit includes a first capacitor, a second capacitor, a third capacitor and an inductor;

[0026] One end of the first capacitor is connected to the first output end of the on-board charger and the first end of the inductor, respectively, and the other end of the first capacitor is connected to the second output end of the on-board charger and the fourth end of the inductor, respectively; wherein the second output end of the on-board charger and the other end of the first capacitor are grounded, the other end of the fourth resistor is connected between the second output end of the on-board charger and the other end of the first capacitor, and the other end of the second resistor is connected between the second output end of the on-board charger and the other end of the first capacitor;

[0027] The second end of the inductor is respectively connected to one end of the second capacitor, the battery module, and one end of the first contactor module, and the third end of the inductor is respectively connected to one end of the third capacitor, the battery module, and one end of the second contactor module;

[0028] One end of the second capacitor is respectively connected to one end of the battery module and the first contactor module, the other end of the second capacitor is connected to the other end of the third capacitor, and one end of the third capacitor is respectively connected to one end of the battery module and the second contactor module; wherein the other end of the second capacitor and the other end of the third capacitor are grounded.

[0029] In one embodiment, the first capacitor is an X capacitor; the second capacitor and the third capacitor are both Y capacitors.

[0030] In one embodiment, the inductor is a common mode inductor.

[0031] In one embodiment, the first contactor module includes a DC contactor; the second contactor module includes a DC contactor.

[0032] In a second aspect, the present application also provides a vehicle, comprising the above-mentioned contactor adhesion detection circuit.

[0033] The above-mentioned contactor adhesion detection circuit and vehicle, the contactor adhesion detection circuit includes a battery module, a first contactor module, a second contactor module, a resistance branch and multiple voltage sampling circuits, wherein the charging component can respectively perform DC fast charging for the battery module through the first contactor module and the second contactor module, the resistance branch is used to provide a bias voltage to facilitate subsequent contactor adhesion detection, and each voltage sampling circuit can be powered by the same auxiliary power supply through a common ground, which simplifies the circuit and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a structural schematic diagram of a conventional contactor adhesion detection circuit in one embodiment;

[0036] Figure 2 is a structural schematic diagram of a conventional contactor adhesion detection circuit in another embodiment;

[0037] Figure 3 is a schematic structural diagram of a contactor adhesion detection circuit in one embodiment;

[0038] Figure 4 is a structural schematic diagram of a contactor adhesion detection circuit in another embodiment;

[0039] Figure 5 is a schematic structural diagram of a voltage sampling circuit in one embodiment;

[0040] Figure 6 is a schematic diagram of the structures of a first sampling circuit, a second sampling circuit and a third sampling circuit in one embodiment;

[0041] Figure 7 is a schematic structural diagram of a vehicle in one embodiment;

[0042] Figure 8 FIG. 4 is a flowchart of a controller in one embodiment. DETAILED DESCRIPTION

[0043] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0046] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0047] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0048] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0049] At present, the existing technical solutions generally detect the voltage at both ends of the fast charging positive and negative ports and compare it with the voltage at the positive and negative ends of the battery to determine the state of the contactor, such as Figure 1 and Figure 2 As shown, the rectifier output of the on-board charger is charged to the power battery through a filter circuit composed of capacitor C1, inductor L1, capacitor C2, and capacitor C3, that is, AC slow charging. Figure 1 K1 and K2 are DC contactors. The charging assembly charges the power battery through the DC contactors K1 and K2, which is DC fast charging. Figure 2 The U1, U2, and U3 chips and their peripheral circuits are respectively ab , U cd and U ce Voltage sampling circuit. By detecting the voltage U ab and voltage U cd Determine the switch state of DC contactor K1 by detecting voltage U ab and voltage U ce Determine the switching state of DC contactor K2.

[0050] Optionally, after the DC contactor K1 is closed, the voltage U ab With voltage U cd After the DC contactor K2 is closed, the voltage U ab With voltage U cd Therefore, the judgment condition can be set: if the voltage U ab With voltage U cd The difference between the voltage U and the contactor K1 is less than 5V, then the DC contactor K1 is determined to be closed; if the voltage U ab With voltage U ceIf the difference is less than 5V, it is determined that the DC contactor K2 is closed; ab , voltage U cd And the voltage U ce The reference grounds are point a, point d and point e respectively, so three auxiliary power supplies (VCC1, VCC2 and VCC3) are needed to power the U1, U2 and U3 sampling chips respectively, which results in a more complex circuit and higher cost.

[0051] It should be noted that Figure 2 The letters "a", "b", "c", "d", and "e" in Figure 1 The letters in correspond one to one.

[0052] The present application unifies the reference ground of the voltage sampling circuit so that each voltage sampling circuit can be powered by the same auxiliary power supply, thereby simplifying the circuit and reducing the cost.

[0053] In an exemplary embodiment, Figure 3 As shown, a contactor adhesion detection circuit provided in an embodiment of the present application includes:

[0054] Battery module 100;

[0055] A first contactor module 110, one end of the first contactor module 110 is connected to the battery module 100, and the other end of the first contactor module 110 is used to connect to a charging component;

[0056] A second contactor module 120, one end of the second contactor module 120 is connected to the battery module 100, and the other end of the second contactor module 120 is used to connect to the charging assembly;

[0057] A resistance branch 130, wherein a first end of the resistance branch 130 is connected between the second contactor module 120 and the charging assembly, a second end of the resistance branch 130 is used to connect to the auxiliary power supply 140, and a third end of the resistance branch 130 is used to be grounded;

[0058] There are multiple voltage sampling circuits 150 , the first end of each voltage sampling circuit 150 is connected to a corresponding sampling point, the second end of each voltage sampling circuit 150 is connected to the auxiliary power supply 140 , and the third end of each voltage sampling circuit 150 is connected to a common ground.

[0059] Among them, the number of voltage sampling circuits can be set according to actual conditions, which will not be elaborated in the embodiment of the present application; the position and number of sampling points can be set according to actual conditions. In the embodiment of the present application, point c between the other end of the first contactor module and the charging component, and point d between the other end of the second contactor module and the charging component are used as examples for explanation.

[0060] Specifically, if Figure 3 As shown, the charging component charges the battery module 100 through the first contactor module 110 and the second contactor module 120, that is, DC fast charging; the resistance branch 130 is used to provide a bias voltage to the other end of the second contactor module 120 and the point d between the charging component, so as to facilitate the subsequent contactor adhesion detection, and the first end of each voltage sampling circuit 150 is respectively connected to the corresponding sampling point to collect the corresponding voltage information, so as to facilitate the subsequent contactor adhesion detection, and the second end of each voltage sampling circuit 150 is connected to the same auxiliary power supply 140, and the third end of each voltage sampling circuit 150 is connected to a common ground, which simplifies the circuit and reduces the cost.

[0061] Optionally, the first output terminal and the second output terminal of the on-board charger may both be rectifier output terminals; the battery module includes a power battery; and the charging component may be a fast charging pile.

[0062] It should be noted that the connection state of the first terminal of each voltage sampling circuit 150 is Figure 3 Not shown in the figure.

[0063] In the above-mentioned contactor adhesion detection circuit, the charging component can perform DC fast charging for the battery module through the first contactor module and the second contactor module respectively. The resistance branch is used to provide a bias voltage to facilitate the subsequent contactor adhesion detection. Each voltage sampling circuit is powered by the same auxiliary power supply through a common ground. The resistance branch is also powered by the same auxiliary power supply, which simplifies the circuit and reduces costs.

[0064] In one embodiment, if Figure 4 As shown, the resistance branch includes a first resistor R1 and a second resistor R2;

[0065] One end of the first resistor R1 is connected between the second contactor module and the charging assembly, and is connected to one end of the second resistor R2, and the other end of the first resistor R1 is used to connect to the auxiliary power supply;

[0066] One end of the second resistor R2 is connected between the second contactor module and the charging assembly, and the other end of the second resistor R2 is grounded.

[0067] Specifically, Figure 4 As shown, the first resistor R1 and the second resistor R2 are connected to the other end of the second contactor module and the point d between the charging component. The other end of the first resistor R1 is used to connect the auxiliary power supply VCC. The voltage output by the auxiliary power supply VCC is divided to the point d between the second contactor module and the charging component after passing through the first resistor R1 and the second resistor R2, so that there is a bias voltage (voltage value is VCC*R2 / R1) when the second contactor module is not closed, which is convenient for subsequent judgment of the switch state of the second contactor module.

[0068] Exemplarily, the switching state of the second contactor module can be determined by the following conditions: if the bias voltage collected by the voltage sampling circuit is VCC*R2 / R1, the second contactor module is in the open state; if the bias voltage collected by the voltage sampling circuit is 0, the second contactor module is in the closed state.

[0069] In an embodiment of the present application, a first resistor and a second resistor are provided in a resistance branch, and the first resistor is connected to an auxiliary power supply. The voltage output by the auxiliary power supply is divided between the second contactor module and the charging component after passing through the first resistor and the second resistor to provide a bias voltage to facilitate subsequent contactor adhesion detection. In addition, the resistance branch and each voltage sampling circuit share an auxiliary power supply, which simplifies the circuit and reduces costs.

[0070] In one embodiment, the first resistor and the second resistor are both voltage-dividing resistors.

[0071] Specifically, the first resistor and the second resistor are used to divide the voltage output by the received auxiliary power supply to provide a bias voltage between the second contactor module and the charging component, so as to facilitate subsequent contactor adhesion detection.

[0072] In one embodiment, if Figure 3 As shown, the contactor adhesion detection circuit also includes:

[0073] The filter circuit has an input end connected to a first output end and a second output end of the vehicle charger, and an output end of the filter circuit is connected to the battery module 100 .

[0074] Specifically, the on-board charger charges the battery module 100 through a filter circuit, that is, AC slow charging.

[0075] In one of the embodiments, the plurality of voltage sampling circuits include a first sampling circuit, a second sampling circuit, and a third sampling circuit;

[0076] The first end of the first sampling circuit is connected between the input end of the filter circuit and the first output end of the on-board charger, the second end of the first sampling circuit is used to connect the auxiliary power supply, and the third end of the first sampling circuit is used to be grounded;

[0077] The first end of the second sampling circuit is connected between the other end of the first contactor module and the charging assembly, the second end of the second sampling circuit is used to connect the auxiliary power supply, and the third end of the second sampling circuit is used to ground;

[0078] The first end of the third sampling circuit is connected between the other end of the second contactor module and the charging assembly, the second end of the third sampling circuit is used to connect to the auxiliary power supply, and the third end of the third sampling circuit is used to be grounded.

[0079] It should be noted that if Figure 4 As shown, point a is between the input end of the filter circuit and the first output end of the vehicle charger; point c is between the other end of the first contactor module and the charging component; point d is between the other end of the second contactor module and the charging component, wherein sampling points a, c and d can be set according to actual conditions and are not limited to the above positions.

[0080] Specifically, Figure 4 As shown, point b between the second output terminal of the on-board charger and the input terminal of the filter circuit can be used for grounding, and the third terminals of each voltage sampling circuit are connected to a common ground, that is, the third terminals of each voltage sampling circuit are connected to point b between the second output terminal of the on-board charger and the input terminal of the filter circuit, that is, the first sampling circuit can be used to collect voltage U ab , the second sampling circuit can be used to collect the voltage U cb , the third sampling circuit can be used to collect the voltage U db The first sampling circuit, the second sampling circuit and the third sampling circuit are all connected to an auxiliary power supply and powered by the auxiliary power supply.

[0081] In the embodiment of the present application, by configuring a first sampling circuit, a second sampling circuit and a third sampling circuit, voltage information corresponding to corresponding sampling points is obtained respectively, which is convenient for subsequent contactor adhesion detection. At the same time, the first sampling circuit, the second sampling circuit and the third sampling circuit share a common ground and can be powered by the same auxiliary power supply, which simplifies the circuit and reduces costs.

[0082] In one embodiment, if Figure 5 As shown, the voltage sampling circuit includes a sampling chip U1, a third resistor R3, a fourth resistor R4 and a fifth resistor R5;

[0083] One end of the third resistor R3 is connected to the corresponding sampling point, and the other end of the third resistor R3 is connected in series with one end of the fourth resistor R4;

[0084] The first input terminal of the sampling chip U1 is connected between the third resistor R3 and the fourth resistor R4, the second input terminal of the sampling chip U1 is connected to the other end of the fourth resistor R4 and then grounded, the negative power terminal of the sampling chip U1 is connected to the second input terminal of the sampling chip U1, and the positive power terminal of the sampling chip U1 is used to connect to the auxiliary power supply VCC;

[0085] The fifth resistor R5 is connected between the output terminal of the sampling chip U1 and the first input terminal of the sampling chip U1 .

[0086] It should be noted that Figure 5The structure of the voltage sampling circuit shown may represent a first sampling circuit, a second sampling circuit or a third sampling circuit. The difference between the first sampling circuit, the second sampling circuit and the third sampling circuit is that they are connected to different sampling points respectively.

[0087] Specifically, Figure 6 As shown, Figure 6 The circuit structure diagrams corresponding to the first sampling circuit, the second sampling circuit and the third sampling circuit are shown as examples. That is, the first sampling circuit can be used to collect the voltage U ab , the second sampling circuit can be used to collect the voltage U cb , the third sampling circuit can be used to collect the voltage U db The first sampling circuit, the second sampling circuit and the third sampling circuit are all connected to an auxiliary power supply and powered by the auxiliary power supply.

[0088] It should be noted that if Figure 4 and Figure 6 As shown, point a is between the input end of the filter circuit and the first output end of the vehicle charger; point c is between the other end of the first contactor module and the charging component; and point d is between the other end of the second contactor module and the charging component.

[0089] In one embodiment, if Figure 4 As shown, the filter circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3 and an inductor L1;

[0090] One end of the first capacitor C1 is connected to the first output end of the on-board charger and the first end of the inductor L1, respectively, and the other end of the first capacitor C1 is connected to the second output end of the on-board charger and the fourth end of the inductor L1, respectively; wherein the second output end of the on-board charger and the other end of the first capacitor C1 are grounded, the other end of the fourth resistor is connected between the second output end of the on-board charger and the other end of the first capacitor C1, and the other end of the second resistor is connected between the second output end of the on-board charger and the other end of the first capacitor C1;

[0091] The second end of the inductor L1 is respectively connected to one end of the second capacitor C2, the battery module 100, and one end of the first contactor module 110, and the third end of the inductor L1 is respectively connected to one end of the third capacitor C3, the battery module 100, and one end of the second contactor module 120;

[0092] One end of the second capacitor C2 is respectively connected to one end of the battery module 100 and the first contactor module 110, the other end of the second capacitor C2 is connected to the other end of the third capacitor C3, and one end of the third capacitor C3 is respectively connected to one end of the battery module 100 and the second contactor module 120; wherein the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded.

[0093] Specifically, the on-board charger performs AC slow charging on the battery module 100 through a filter circuit composed of a first capacitor C1 , a second capacitor C2 , a third capacitor C3 and an inductor L1 .

[0094] In one embodiment, the first capacitor is an X capacitor; the second capacitor and the third capacitor are both Y capacitors.

[0095] In one embodiment, the inductor is a common mode inductor.

[0096] Specifically, the on-board charger performs AC slow charging on the battery module through a filter circuit composed of an X capacitor, two Y capacitors and a common-mode inductor.

[0097] In one embodiment, the first contactor module includes a DC contactor; the second contactor module includes a DC contactor.

[0098] It should be noted that the first contactor module may be a single DC contactor, and the second contactor module may be a single DC contactor; the number of DC contactors may be set according to actual conditions and is not limited in the embodiments of the present application.

[0099] In an exemplary embodiment, Figure 7 As shown, the vehicle provided in the embodiment of the present application includes the above-mentioned contactor adhesion detection circuit.

[0100] Specifically, a controller may be provided in the vehicle, and the controller may be connected to the first sampling circuit, the second sampling circuit, and the third sampling circuit in the contactor adhesion detection circuit, respectively, that is, the controller may obtain the voltage U ab , voltage U cb and voltage U db , and then determine the switching status of the first contactor module K1 and the second contactor module K2.

[0101] For example, the workflow of the controller is as follows: Figure 8 As shown, the controller compares the voltage U ab and voltage U cb If they are similar, the first contactor module K1 is determined to be in a closed state, otherwise the determination is terminated; when the first contactor module K1 is determined to be in a closed state, the controller detects whether an instruction for instructing the first contactor module K1 to close is received, if so, the determination is terminated, otherwise it is determined that the first contactor module K1 is abnormal and a sticking fault occurs. The controller compares the voltage U dbWhether it is close to 0, if it is close, it is determined that the second contactor module K2 is in a closed state, otherwise the determination is terminated; when it is determined that the second contactor module K2 is in a closed state, the controller detects whether an instruction for instructing the second contactor module K2 to close is received, if so, the determination is terminated, otherwise it is determined that the state of the second contactor module K2 is abnormal and a adhesion fault occurs.

[0102] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. 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 description of the above terms does not necessarily refer to the same embodiment or example.

[0103] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A contactor adhesion detection circuit, characterized in that: include: Battery module; A first contactor module, one end of which is connected to the battery module, and the other end of which is used to connect to a charging assembly; A second contactor module, one end of the second contactor module is connected to the battery module, and the other end of the second contactor module is used to connect to the charging assembly; a resistance branch, wherein a first end of the resistance branch is connected between the second contactor module and the charging assembly, a second end of the resistance branch is used to connect an auxiliary power supply, and a third end of the resistance branch is used to be grounded; A plurality of voltage sampling circuits, wherein the first end of each of the voltage sampling circuits is respectively connected to a corresponding sampling point, the second end of each of the voltage sampling circuits is connected to the auxiliary power supply, and the third end of each of the voltage sampling circuits is commonly grounded.

2. The contactor adhesion detection circuit according to claim 1, characterized in that: The resistance branch includes a first resistor and a second resistor; One end of the first resistor is connected between the second contactor module and the charging assembly, and connected to one end of the second resistor, and the other end of the first resistor is used to connect to the auxiliary power supply; One end of the second resistor is connected between the second contactor module and the charging component, and the other end of the second resistor is grounded.

3. The contactor adhesion detection circuit according to claim 2, characterized in that: The first resistor and the second resistor are both voltage-dividing resistors.

4. The contactor adhesion detection circuit according to claim 2, characterized in that: The contactor adhesion detection circuit also includes: A filter circuit, wherein the input end of the filter circuit is used to connect to the first output end and the second output end of the vehicle charger respectively, and the output end of the filter circuit is connected to the battery module.

5. The contactor adhesion detection circuit according to claim 4, characterized in that: The plurality of voltage sampling circuits include a first sampling circuit, a second sampling circuit and a third sampling circuit; The first end of the first sampling circuit is connected between the input end of the filter circuit and the first output end of the on-board charger, the second end of the first sampling circuit is used to connect the auxiliary power supply, and the third end of the first sampling circuit is used to be grounded; The first end of the second sampling circuit is connected between the other end of the first contactor module and the charging component, the second end of the second sampling circuit is used to connect the auxiliary power supply, and the third end of the second sampling circuit is used to be grounded; The first end of the third sampling circuit is connected between the other end of the second contactor module and the charging component, the second end of the third sampling circuit is used to connect to the auxiliary power supply, and the third end of the third sampling circuit is used to be grounded.

6. The contactor adhesion detection circuit according to claim 5, characterized in that: The voltage sampling circuit includes a sampling chip, a third resistor, a fourth resistor and a fifth resistor; One end of the third resistor is connected to the corresponding sampling point, and the other end of the third resistor is connected in series with one end of the fourth resistor; The first input end of the sampling chip is connected between the third resistor and the fourth resistor, the second input end of the sampling chip is connected to the other end of the fourth resistor and then grounded, the negative end of the power supply of the sampling chip is connected to the second input end of the sampling chip, and the positive end of the power supply of the sampling chip is used to connect to the auxiliary power supply; The fifth resistor is connected between the output terminal of the sampling chip and the first input terminal of the sampling chip.

7. The contactor adhesion detection circuit according to claim 6, characterized in that: The filter circuit includes a first capacitor, a second capacitor, a third capacitor and an inductor; One end of the first capacitor is respectively connected to the first output end of the on-board charger and the first end of the inductor, and the other end of the first capacitor is respectively connected to the second output end of the on-board charger and the fourth end of the inductor; wherein the second output end of the on-board charger and the other end of the first capacitor are grounded, the other end of the fourth resistor is connected between the second output end of the on-board charger and the other end of the first capacitor, and the other end of the second resistor is connected between the second output end of the on-board charger and the other end of the first capacitor; The second end of the inductor is respectively connected to one end of the second capacitor, the battery module, and one end of the first contactor module, and the third end of the inductor is respectively connected to one end of the third capacitor, the battery module, and one end of the second contactor module; One end of the second capacitor is connected to one end of the battery module and the first contactor module respectively, the other end of the second capacitor is connected to the other end of the third capacitor, and one end of the third capacitor is connected to one end of the battery module and the second contactor module respectively; wherein the other end of the second capacitor and the other end of the third capacitor are grounded.

8. The contactor adhesion detection circuit according to claim 7, characterized in that: The first capacitor is an X capacitor; the second capacitor and the third capacitor are both Y capacitors.

9. The contactor adhesion detection circuit according to claim 7, characterized in that: The inductor is a common mode inductor.

10. The contactor adhesion detection circuit according to claim 1, characterized in that: The first contactor module includes a DC contactor; the second contactor module includes a DC contactor.

11. A vehicle, characterized in that: The method comprises a contactor sticking detection circuit according to any one of claims 1 to 10.

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