Contactor sintering detection circuit and method, battery system and vehicle

Abstract

The invention discloses a contactor sintering detection circuit and method, a battery system and a vehicle. According to the contactor sintering detection circuit and method, the battery system and the vehicle provided by the invention, the first detection circuit performs sintering detection on the contactor in an indirect connection mode, and a new detection mode is provided for sintering detection of the contactor.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a contactor sintering detection circuit, method, battery system and vehicle. Background Art

[0002] In electric vehicles, the on-off state of the circuit is controlled by closing and opening the contactor. Taking the DC charging circuit as an example, if all the contactors from the power battery output to the charging connector are closed, the high-voltage terminals in the charging connector will be in a high-voltage charged state, which poses a safety risk under non-charging conditions. Therefore, electric vehicles should have charging circuit contactor adhesion monitoring (i.e. sintering detection) and alarm functions.

[0003] However, the circuit currently used for contactor sintering detection is usually directly connected to the contactor, and the method for performing sintering detection on the contactor is single. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] The present invention provides a contactor sintering detection circuit, comprising a first detection circuit, wherein the first detection circuit is used for performing sintering detection on the contactor in an indirect connection manner.

[0006] Exemplarily, the first detection circuit includes: a linkage device, which is linked with the contactor to perform sintering detection on the contactor through an indirect connection.

[0007] Exemplarily, the first detection circuit is used to perform sintering detection on the contactor by indirect connection, including:

[0008] In response to the linkage device of the first detection circuit being linked to the contactor, obtaining a state of the linkage device;

[0009] It is determined whether the contactor is sintered or unsintered based on the state of the linkage.

[0010] Exemplarily, the first detection circuit includes:

[0011] Auxiliary contacts, the auxiliary contacts are linked with the contactor;

[0012] a diode, the diode being connected in series with the auxiliary contact;

[0013] The voltage-dividing circuit comprises at least two voltage-dividing resistors connected in series; wherein the diode is connected in parallel with part of the voltage-dividing resistors; and

[0014] The first sampling circuit is used to obtain a sampling voltage.

[0015] Exemplarily, when the auxiliary contact is closed, the first sampling circuit acquires the voltage drop across the diode, and when the auxiliary contact is open, the first sampling circuit acquires the voltage across part of the voltage-dividing resistor.

[0016] Exemplarily, the linkage between the auxiliary contact and the contactor includes:

[0017] When the contactor is closed, the auxiliary contact is closed, and when the contactor is opened, the auxiliary contact is opened; or,

[0018] When the contactor is closed, the auxiliary contact is open, and when the contactor is open, the auxiliary contact is closed.

[0019] Exemplarily, the first detection circuit further includes: a power supply;

[0020] The voltage-dividing circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor and a third voltage-dividing resistor connected in series, the first voltage-dividing resistor is connected to the power supply, the second voltage-dividing resistor is connected between the first voltage-dividing resistor and the third voltage-dividing resistor, and the third voltage-dividing resistor is grounded;

[0021] The diode is connected between the first voltage-dividing resistor and the first end of the auxiliary contact, the second end of the auxiliary contact is grounded, and a first branch formed by the diode and the auxiliary contact is connected in parallel with a second branch formed by the second voltage-dividing resistor and the third voltage-dividing resistor;

[0022] The first sampling circuit is used to obtain the voltage drop across the diode when the auxiliary contact is closed, and to obtain the voltage across the third voltage-dividing resistor when the auxiliary contact is open.

[0023] Exemplarily, the contactor sintering detection circuit further includes: a second detection circuit, and the second detection circuit is used to perform sintering detection on the contactor by direct connection.

[0024] Exemplarily, two ends of the second detection circuit are connected to two ends of the contactor respectively.

[0025] Exemplarily, the second detection circuit includes a detection switch, a sampling resistor and a second sampling circuit, the detection switch and the sampling resistor are connected in series, and the second sampling circuit is used to obtain a sampling voltage.

[0026] Exemplarily, the sampling resistor includes a first sampling resistor and a second sampling resistor connected in series, and the detection switch is connected between a first end of the second detection circuit and the first sampling resistor, and the second sampling circuit is used to obtain a voltage across the second sampling resistor.

[0027] The present invention also provides a contactor sintering detection method, wherein a first detection circuit performs sintering detection on the contactor in an indirect connection manner.

[0028] Exemplarily, the first detection circuit performs sintering detection on the contactor by indirect connection, including:

[0029] In response to the linkage device of the first detection circuit being linked to the contactor, obtaining a state of the linkage device;

[0030] It is determined whether the contactor is sintered or unsintered based on the state of the linkage.

[0031] Exemplarily, the first detection circuit performs sintering detection on the contactor by indirect connection, including:

[0032] Disconnect the contactor;

[0033] In response to the linkage between the auxiliary contact of the first detection circuit and the contactor, the state of the auxiliary contact is a preset state, and the voltage of the first sampling circuit is obtained;

[0034] When the voltage obtained by the first sampling circuit of the first detection circuit is consistent with the preset voltage of the auxiliary contact in the preset state, the contactor is not sintered; when the voltage obtained by the first sampling circuit of the first detection circuit is inconsistent with the preset voltage of the auxiliary contact in the preset state, the contactor is sintered.

[0035] The present invention also provides a processing device, comprising:

[0036] A storage medium and a processor, wherein the storage medium stores a computer program to be executed by the processor, and when the computer program is executed by the processor, the processor executes any one of the contactor sintering detection methods described above.

[0037] The present invention further provides a storage medium, on which a computer program is stored. When the computer program is run, any of the contactor sintering detection methods described above is executed.

[0038] The present invention also provides a battery system, comprising any one of the contactor sintering detection circuits described above.

[0039] The present invention also provides a vehicle, comprising the battery system as described above.

[0040] According to the contactor sintering detection circuit, method, battery system and vehicle provided by the present invention, the first detection circuit performs sintering detection on the contactor by indirect connection, which provides a new detection method for contactor sintering detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0042] In the attached figure:

[0043] Figure 1 A schematic diagram of a contactor sintering detection circuit provided by an embodiment of the present invention;

[0044] Figure 2 A flowchart for determining the effectiveness of a first detection circuit provided by an embodiment of the present invention;

[0045] Figure 3 A flowchart for determining the effectiveness of a second detection circuit provided by an embodiment of the present invention;

[0046] Figure 4 A flowchart of a contactor sintering detection circuit provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0048] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0049] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0050] In order to fully understand the present invention, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0051] In order to address the problem that the current circuits used for contactor sintering detection are usually directly connected to the contactor, resulting in a single method for detecting sintering of the contactor, the present invention provides a contactor sintering detection circuit, including a first detection circuit, wherein the first detection circuit is used to detect sintering of the contactor through an indirect connection.

[0052] In one embodiment, Figure 1 As shown, the contactor sintering detection circuit includes a contactor, which is a contactor to be detected, and the contactor is connected to the DC charging port 100 and the power battery 200. Further, the contactor includes a positive contactor and / or a negative contactor, the positive contactor is connected to the positive pole of the DC charging port and the positive pole of the power battery, and the negative contactor is connected to the negative pole of the DC charging port and the negative pole of the power battery. Figure 1 As shown, the contactor is a DC charging positive electrode contactor K4 as an example, that is, the contactor sintering detection circuit provided by the present invention is used to detect whether the DC charging positive electrode contactor K4 is sintered.

[0053] exist Figure 1 In the embodiment shown, the contactor sintering detection circuit also includes a battery positive contactor K2 and a battery negative contactor K3, as well as a pre-charging contactor K1 and a pre-charging resistor R1, which are connected in series with the battery positive contactor K2. When the contactor sintering detection circuit performs DC charging, the DC charging positive contactor K4, the DC charging negative contactor K5, the battery positive contactor K2, and the battery negative contactor K3 are all closed.

[0054] Exemplarily, the first detection circuit includes a linkage device, and the linkage device is linked with the contactor to perform sintering detection on the contactor by indirect connection. Further, the first detection circuit is used to perform sintering detection on the contactor by indirect connection, including: in response to the linkage device of the first detection circuit being linked with the contactor, obtaining the state of the linkage device; and determining whether the contactor is sintered or not sintered based on the state of the linkage device.

[0055] In one embodiment, the linkage device includes an auxiliary contact, and the auxiliary contact is linked with the contactor. Further, the auxiliary contact includes a normally open type and a normally closed type. When the auxiliary contact is a normally open type, the linkage between the contactor and the auxiliary contact includes: when the contactor is closed, the auxiliary contact is closed, and when the contactor is disconnected, the auxiliary contact is disconnected. When the auxiliary contact is a normally closed type, the linkage between the contactor and the auxiliary contact includes: when the contactor is closed, the auxiliary contact is disconnected, and when the contactor is disconnected, the auxiliary contact is closed.

[0056] Exemplarily, the first detection circuit 300 includes: an auxiliary contact, the auxiliary contact is linked with the contactor; a diode D1, the diode D1 is connected in series with the auxiliary contact; a voltage divider circuit, including at least two voltage divider resistors connected in series; a first sampling circuit, used to obtain a sampled voltage. Further, when the auxiliary contact is closed, the first sampling circuit obtains the voltage drop across the diode, and when the auxiliary contact is open, the first sampling circuit obtains the voltage across the voltage divider resistor.

[0057] In one embodiment, Figure 1 As shown, the first detection circuit 300 includes an independent power supply Vcc, and the voltage divider circuit includes a first voltage divider resistor R2, a second voltage divider resistor R3 and a third voltage divider resistor R4 connected in series, the first voltage divider resistor R2 is connected to the power supply Vcc, and the third voltage divider resistor R4 is grounded. The circuit formed by the diode D1 and the auxiliary contact K4' is connected in parallel with the circuit formed by the second voltage divider resistor R3 and the third voltage divider resistor R4. When the auxiliary contact K4' is closed, the first sampling circuit V1 obtains the voltage drop across the diode D1, and when the auxiliary contact K4' is open, the first sampling circuit V1 obtains the voltage across the third voltage divider resistor.

[0058] Exemplarily, the contactor sintering detection circuit further includes a second detection circuit, and the second detection circuit is used to perform sintering detection on the contactor by direct connection. Further, two ends of the second detection circuit are respectively connected to two ends of the contactor to perform sintering detection on the contactor by direct connection.

[0059] In one embodiment, the first end of the second detection circuit 400 is directly connected to the DC charging port, and the effectiveness of the second detection circuit is detected during DC charging. The first end of the second detection circuit is connected to the power battery via the contactor, and the second detection circuit is used for sintering detection of the contactor when the contactor is disconnected. When the DC charging positive contactor K4 is subjected to sintering detection, the auxiliary contact of the first detection circuit 300 is the auxiliary contact K4' of the DC charging positive contactor K4, the first end of the second detection circuit is directly connected to the positive electrode of the DC charging port, the first end of the second detection circuit is connected to the positive electrode of the power battery through the DC charging positive contactor K4, the second end of the second detection circuit is connected to the negative electrode of the DC charging port through the DC charging negative contactor K5, and the second end of the second detection circuit is directly connected to the negative electrode of the power battery.

[0060] Exemplarily, the second detection circuit includes a detection switch, a sampling resistor and a second sampling circuit, the detection switch and the sampling resistor are connected in series, and the second sampling circuit is used to obtain a sampling voltage.

[0061] In one embodiment, Figure 1 As shown, the first end of the second detection circuit 400 is directly connected to the positive electrode of the DC charging port 100, the first end of the second detection circuit 400 is connected to the positive electrode of the power battery 200 via the DC charging positive electrode contactor K4, the second end of the second detection circuit 400 is connected to the negative electrode of the DC charging port 100 via the DC charging negative electrode contactor K5, and the second end of the second detection circuit 400 is directly connected to the negative electrode of the power battery 200. The second detection circuit 400 includes a detection switch K6, a first sampling resistor R5, and a second sampling resistor R6 connected in series, and the second detection circuit 400 also includes a second sampling circuit V2, and the second sampling circuit V2 is used to obtain the voltage across the second sampling resistor R6.

[0062] In one embodiment, when the second detection circuit performs sintering detection on the contactor, the DC charging positive electrode contactor K4 is disconnected and the battery positive electrode contactor K2 is closed.

[0063] The present invention also provides a contactor sintering detection method, wherein a first detection circuit performs sintering detection on the contactor in an indirect connection manner.

[0064] Exemplarily, the first detection circuit performs sintering detection on the contactor by indirect connection, including: acquiring the state of the linkage device in response to the linkage of the first detection circuit with the contactor; and determining whether the contactor is sintered or unsintered based on the state of the linkage device.

[0065] In one embodiment, the first detection circuit performs sintering detection on the contactor through an indirect connection, including: disconnecting the contactor; in response to the auxiliary contact of the first detection circuit being linked with the contactor, the state of the auxiliary contact is a preset state, obtaining the voltage of the first sampling circuit; when the voltage obtained by the first sampling circuit of the first detection circuit is consistent with the preset voltage of the auxiliary contact in the preset state, the contactor is not sintered, and when the voltage obtained by the first sampling circuit of the first detection circuit is inconsistent with the preset voltage of the auxiliary contact in the preset state, the contactor is sintered.

[0066] In one embodiment, Figure 1 The contactor sintering detection circuit shown in the figure, the sintering detection process includes the following steps:

[0067] Determining the effectiveness of the first detection circuit based on the linkage between the contactor and the auxiliary contact;

[0068] Determining the effectiveness of the second detection circuit based on obtaining the voltage of the sampling resistor;

[0069] When the first detection circuit and / or the second detection circuit is effective, it is detected whether the contactor is sintered.

[0070] First, based on the linkage between the contactor and the auxiliary contact, determining the effectiveness of the first detection circuit includes: when the contactor is in the first state and the state of the auxiliary contact is consistent with the preset state, determining that the first detection circuit is valid; when the contactor is in the first state and the state of the auxiliary contact is inconsistent with the preset state, determining that the first detection circuit is invalid.

[0071] In one embodiment, Figure 2As shown, when the DC charging positive contactor K4 is in a closed state and the auxiliary contact K4' is a normally open type, the preset state that is linked to the closed state of the DC charging positive contactor K4 is a closed state. When the voltage of the first sampling circuit V1 is the voltage drop across the diode D1, it is confirmed that the auxiliary contact K4' is in a closed state, which is consistent with the preset state, and the first detection circuit 300 is effective. When the DC charging positive contactor K4 is in a closed state and the auxiliary contact K4' is a normally open type, the preset state that is linked to the closed state of the DC charging positive contactor K4 is a closed state. When the voltage of the first sampling circuit V1 is the voltage across the third voltage-dividing resistor R4, it is confirmed that the auxiliary contact K4' is in a disconnected state, which is inconsistent with the preset state, and the first detection circuit 300 fails. When the DC charging positive contactor K4 is in a closed state and the auxiliary contact K4' is a normally closed type, the preset state that is linked to the closed state of the DC charging positive contactor K4 is an open state. When the voltage of the first sampling circuit V1 is the voltage across the third voltage-dividing resistor R4, it is confirmed that the auxiliary contact K4' is in an open state, which is consistent with the preset state, and the first detection circuit 300 is effective. When the DC charging positive contactor K4 is in a closed state and the auxiliary contact K4' is a normally closed type, the preset state that is linked to the closed state of the DC charging positive contactor K4 is an open state. When the voltage of the first sampling circuit V1 is the voltage drop across the diode D1, it is confirmed that the auxiliary contact K4' is in a closed state, which is inconsistent with the preset state, and the first detection circuit 300 fails.

[0072] Next, based on obtaining the voltage of the sampling resistor, determining the effectiveness of the second detection circuit includes: when DC charging, closing the detection switch, when the voltage obtained by the second sampling circuit is the preset divided voltage of the sampling resistor, the second detection circuit is effective, when the voltage obtained by the second sampling circuit is not the preset divided voltage of the sampling resistor, the second detection circuit is invalid.

[0073] In one embodiment, according to Figure 1 As shown, since the second detection circuit 400 does not have an independent power supply, the effectiveness of the second detection circuit 400 needs to be determined during DC charging. Figure 3 During DC charging, the DC charging positive contactor K4, the DC charging negative contactor K5, the battery positive contactor K2 and the battery negative contactor K3 are all closed, and the DC charging voltage is U. When the voltage obtained by the second sampling circuit V2 is the preset divided voltage U*R6 / (R5+R6) of the sampling resistor R6, the second detection circuit 400 is effective; when the voltage obtained by the second sampling circuit V2 is zero or deviates greatly from the preset divided voltage U*R6 / (R5+R6) of the sampling resistor R6, the second detection circuit 400 fails.

[0074] It should be noted that the execution order of the above steps is not limited, and the above steps can be executed synchronously.

[0075] Next, when the first detection circuit and / or the second detection circuit is effective, it is detected whether the contactor is sintered.

[0076] In one embodiment, Figure 4 As shown, when the first detection circuit 300 is valid and the second detection circuit 400 fails, the first detection circuit 300 is used to perform contactor sintering detection; when the first detection circuit 300 fails and the second detection circuit 400 is valid, the second detection circuit 400 is used to perform contactor sintering detection; when both the first detection circuit 300 and the second detection circuit 400 are valid, the first detection circuit 300 and the second detection circuit 400 are used to perform contactor sintering detection; when both the first detection circuit 300 and the second detection circuit 400 fail, contactor sintering detection cannot be performed.

[0077] Exemplarily, when the first detection circuit is valid, detecting whether the contactor is sintered includes: disconnecting the contactor, the state of the auxiliary contact is a preset state, when the voltage obtained by the first sampling circuit of the first detection circuit is consistent with the preset voltage of the auxiliary contact in the preset state, the contactor has not been sintered, and when the voltage obtained by the first sampling circuit of the first detection circuit is inconsistent with the preset voltage of the auxiliary contact in the preset state, the contactor has been sintered.

[0078] In one embodiment, according to Figure 1 As shown, since the first detection circuit 300 includes an independent power supply Vcc, the judgment of the effectiveness of the first detection circuit 300 is not affected by the states (closed or disconnected) of the DC charging negative contactor K5, the battery positive contactor K2, and the battery negative contactor K3. The sintering detection of the first detection circuit 300 is also not affected by the states (closed or disconnected) of the DC charging negative contactor K5, the battery positive contactor K2, and the battery negative contactor K3. When performing the sintering detection of the DC charging positive contactor K4, the DC charging positive contactor K4 is disconnected, and the auxiliary contact K4' is in a preset state. Taking the auxiliary contact K4' as a normally open type as an example, the preset state of the auxiliary contact is a disconnected state. When the voltage of the first sampling circuit V1 is the voltage across the third voltage-dividing resistor R4, it is confirmed that the auxiliary contact K4' is in an open state, and the DC charging positive contactor K4 is not sintered. When the voltage of the first sampling circuit V1 is the voltage drop across the diode D1, it is confirmed that the auxiliary contact K4' is in a closed state, and the DC charging positive contactor K4 is sintered.

[0079] Exemplarily, when the second detection circuit is effective, detecting whether the contactor is sintered includes: ending DC charging, disconnecting the contactor, when the voltage of the sampling resistor obtained by the second sampling circuit is not zero, the contactor is sintered, and when the voltage of the sampling resistor obtained by the second sampling circuit is zero, the contactor is not sintered.

[0080] In one embodiment, according to Figure 1 As shown, the sintering detection of the second detection circuit 400 needs to be performed after the DC charging is completed. At this time, the DC charging positive contactor K4 and the DC charging negative contactor K5 are both disconnected. Since the second detection circuit 400 does not include an independent power supply, when the sintering detection of the DC charging positive contactor K4 is performed, the battery positive contactor K2 is closed. When the voltage of the sampling resistor R6 obtained by the second sampling circuit is zero, the DC charging positive contactor K4 is not sintered; when the voltage of the sampling resistor R6 obtained by the second sampling circuit is U*R6 / (R5+R6), the DC charging positive contactor K4 is sintered.

[0081] The present invention also provides a processing device, comprising: a storage medium and a processor, wherein the storage medium stores a computer program to be executed by the processor, and when the computer program is executed by the processor, the processor executes the contactor sintering detection method as described above.

[0082] The present invention further provides a storage medium, on which a computer program is stored. When the computer program is run, the contactor sintering detection method as described above is executed.

[0083] The present invention also provides a battery system, comprising the contactor sintering detection circuit as described above.

[0084] The present invention also provides a vehicle, comprising the battery system as described above.

[0085] According to the contactor sintering detection circuit, method, battery system and vehicle provided by the present invention, the first detection circuit performs sintering detection on the contactor by indirect connection, which provides a new detection method for contactor sintering detection.

[0086] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A contactor sintering detection circuit, characterized in that: It comprises a first detection circuit, and the first detection circuit is used for performing sintering detection on the contactor by indirect connection.

2. The contactor sintering detection circuit according to claim 1, characterized in that: The first detection circuit comprises: A linkage device is linked with the contactor to perform sintering detection on the contactor through an indirect connection.

3. The contactor sintering detection circuit according to claim 2, characterized in that: The first detection circuit is used to detect the sintering of the contactor by indirect connection, and includes: In response to the linkage device of the first detection circuit being linked to the contactor, obtaining a state of the linkage device; It is determined whether the contactor is sintered or unsintered based on the state of the linkage.

4. The contactor sintering detection circuit according to claim 1, characterized in that: The first detection circuit comprises: Auxiliary contacts, the auxiliary contacts are linked with the contactor; a diode, the diode being connected in series with the auxiliary contact; The voltage-dividing circuit comprises at least two voltage-dividing resistors connected in series; wherein the diode is connected in parallel with part of the voltage-dividing resistors; and The first sampling circuit is used to obtain a sampling voltage.

5. The contactor sintering detection circuit according to claim 4, characterized in that: When the auxiliary contact is closed, the first sampling circuit acquires the voltage drop across the diode, and when the auxiliary contact is open, the first sampling circuit acquires the voltage across part of the voltage-dividing resistor.

6. The contactor sintering detection circuit according to claim 4, characterized in that: The linkage between the auxiliary contact and the contactor includes: When the contactor is closed, the auxiliary contact is closed, and when the contactor is opened, the auxiliary contact is opened; or, When the contactor is closed, the auxiliary contact is open, and when the contactor is open, the auxiliary contact is closed.

7. The contactor sintering detection circuit according to claim 4, characterized in that: The first detection circuit further includes: a power supply; The voltage-dividing circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor and a third voltage-dividing resistor connected in series, the first voltage-dividing resistor is connected to the power supply, the second voltage-dividing resistor is connected between the first voltage-dividing resistor and the third voltage-dividing resistor, and the third voltage-dividing resistor is grounded; The diode is connected between the first voltage-dividing resistor and the first end of the auxiliary contact, the second end of the auxiliary contact is grounded, and a first branch formed by the diode and the auxiliary contact is connected in parallel with a second branch formed by the second voltage-dividing resistor and the third voltage-dividing resistor; The first sampling circuit is used to obtain the voltage drop across the diode when the auxiliary contact is closed, and to obtain the voltage across the third voltage-dividing resistor when the auxiliary contact is open.

8. The contactor sintering detection circuit according to claim 1, characterized in that: Also includes: The second detection circuit is used to perform sintering detection on the contactor by direct connection.

9. The contactor sintering detection circuit according to claim 8, characterized in that: Two ends of the second detection circuit are respectively connected to two ends of the contactor.

10. The contactor sintering detection circuit according to claim 8, characterized in that: The second detection circuit includes a detection switch, a sampling resistor and a second sampling circuit. The detection switch and the sampling resistor are connected in series. The second sampling circuit is used to obtain a sampling voltage.

11. The contactor sintering detection circuit according to claim 8, characterized in that: The sampling resistor includes a first sampling resistor and a second sampling resistor connected in series, and the detection switch is connected between a first end of the second detection circuit and the first sampling resistor, and the second sampling circuit is used to obtain the voltage across the second sampling resistor.

12. A contactor sintering detection method, characterized in that: The first detection circuit performs sintering detection on the contactor by indirect connection.

13. The contactor sintering detection method according to claim 12, characterized in that: The first detection circuit performs sintering detection on the contactor by indirect connection, including: In response to the linkage device of the first detection circuit being linked to the contactor, obtaining a state of the linkage device; It is determined whether the contactor is sintered or unsintered based on the state of the linkage.

14. The contactor sintering detection method according to claim 12, characterized in that: The first detection circuit performs sintering detection on the contactor by indirect connection, including: Disconnect the contactor; In response to the linkage between the auxiliary contact of the first detection circuit and the contactor, the state of the auxiliary contact is a preset state, and the voltage of the first sampling circuit is obtained; When the voltage obtained by the first sampling circuit of the first detection circuit is consistent with the preset voltage of the auxiliary contact in the preset state, the contactor is not sintered; when the voltage obtained by the first sampling circuit of the first detection circuit is inconsistent with the preset voltage of the auxiliary contact in the preset state, the contactor is sintered.

15. A processing device, characterized in that: include: A storage medium and a processor, wherein the storage medium stores a computer program to be executed by the processor, and when the computer program is executed by the processor, the processor executes the contactor sintering detection method according to any one of claims 12 to 14.

16. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed, the contactor sintering detection method according to any one of claims 12 to 14 is executed.

17. A battery system, characterized in that: The invention comprises the contactor sintering detection circuit according to any one of claims 1 to 11.

18. A vehicle, characterized in that: A battery system comprising the battery system of claim 17.

Images