Contactor sintering detection circuit, method, battery system, and vehicle

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a contactor sintering detection circuit, method, battery system, and vehicle. Background Technology

[0002] In electric vehicles, contactors are used to control the on / off state of the circuit. Taking a DC charging circuit as an example, if all contactors from the battery output to the charging connector are closed, the high-voltage terminals in the charging connector will be energized, posing a safety risk when not charging. Therefore, electric vehicles should have contactor adhesion monitoring (i.e., sintering detection) and alarm functions in the charging circuit.

[0003] However, the circuits currently used for contactor sintering testing are usually directly connected to the contactor, resulting in a limited method for sintering testing of the contactor. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The present invention provides a contactor sintering detection circuit, including a first detection circuit, which is used to perform sintering detection on the contactor through an indirect connection.

[0006] For example, the first detection circuit includes a linkage device that is linked to the contactor to perform sintering detection on the contactor through an indirect connection.

[0007] For example, the first detection circuit is used to perform sintering detection on the contactor via an indirect connection, including:

[0008] The linkage device and contactor are linked in response to the first detection circuit to obtain the state of the linkage device;

[0009] The state of the linkage device determines whether the contactor is sintered or not.

[0010] For example, the first detection circuit includes:

[0011] Auxiliary contact, which is linked to the contactor;

[0012] A diode, wherein the diode is connected in series with the auxiliary contact;

[0013] A voltage divider circuit includes at least two voltage divider resistors connected in series; wherein the diode is connected in parallel with a portion of the voltage divider resistors; and

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

[0015] For example, 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 part of the voltage divider resistor.

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

[0017] When the contactor is closed, the auxiliary contact is closed; when the contactor is open, the auxiliary contact is open; or...

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

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

[0020] The voltage divider circuit includes a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected in series. The first voltage divider resistor is connected to the power supply, the second voltage divider resistor is connected between the first voltage divider resistor and the third voltage divider resistor, and the third voltage divider resistor is grounded.

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

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

[0023] For example, the contactor sintering detection circuit further includes a second detection circuit, which is used to perform sintering detection on the contactor through a direct connection.

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

[0025] For example, the second detection circuit includes a detection switch, a sampling resistor, and a second sampling circuit, wherein the detection switch and the sampling resistor are connected in series, and the second sampling circuit is used to acquire the sampling voltage.

[0026] For example, the sampling resistor includes a first sampling resistor and a second sampling resistor connected in series, and the detection switch is connected between the first terminal of the second detection circuit and the first sampling resistor. The second sampling circuit is used to obtain the 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 through an indirect connection.

[0028] For example, the first detection circuit performs sintering detection on the contactor via indirect connection, including:

[0029] The linkage device and contactor are linked in response to the first detection circuit to obtain the status of the linkage device;

[0030] The state of the linkage device determines whether the contactor is sintered or not.

[0031] For example, the first detection circuit performs sintering detection on the contactor via 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 does not sinter; 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 sinters.

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

[0036] A storage medium and a processor, wherein the storage medium stores a computer program executed by the processor, the computer program, when executed by the processor, causes the processor to perform the contactor sintering detection method described in any of the preceding claims.

[0037] The present invention also provides a storage medium storing a computer program that, when run, executes the contactor sintering detection method described in any of the preceding claims.

[0038] The present invention also provides a battery system including the contactor sintering detection circuit described in any of the above claims.

[0039] The present invention also provides a vehicle including the battery system 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 through an indirect connection, providing a new detection method for contactor sintering detection. Attached Figure Description

[0041] The following drawings, which are incorporated herein by reference as part of this invention, are provided for understanding the invention. The drawings illustrate embodiments of the invention and their descriptions, serving to explain the principles of the invention.

[0042] In the attached image:

[0043] Figure 1 This is a schematic diagram of a contactor sintering detection circuit provided in one embodiment of the present invention;

[0044] Figure 2 This is a flowchart illustrating the process of determining the validity of a first detection circuit according to an embodiment of the present invention.

[0045] Figure 3 This is a flowchart illustrating the process of determining the validity of a second detection circuit according to one embodiment of the present invention.

[0046] Figure 4 This is a flowchart illustrating the operation of a contactor sintering detection circuit according to an embodiment of the present invention. Detailed Implementation

[0047] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0048] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0049] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0050] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0051] To address the problem that current circuits used for contactor sintering detection are typically directly connected to the contactor, resulting in a limited method for contactor sintering detection, this invention provides a contactor sintering detection circuit, including a first detection circuit, which is used to perform sintering detection on the contactor through an indirect connection.

[0052] In one embodiment, such as Figure 1 As shown, the contactor sintering detection circuit includes a contactor, which is the contactor to be tested, 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 being connected to the positive terminal of the DC charging port and the positive terminal of the power battery, and the negative contactor being connected to the negative terminal of the DC charging port and the negative terminal of the power battery. Figure 1 As shown, taking the DC charging positive contactor K4 as an example, the contactor sintering detection circuit provided by the present invention is used to detect whether the DC charging positive contactor K4 has sintered.

[0053] exist Figure 1 In the illustrated embodiment, the contactor sintering detection circuit further includes a battery positive contactor K2 and a battery negative contactor K3, as well as a pre-charge contactor K1 and a pre-charge resistor R1. The pre-charge contactor K1 and the pre-charge resistor R1 are connected in series and then in parallel 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] For example, the first detection circuit includes a linkage device that is linked to the contactor to perform sintering detection on the contactor via an indirect connection. Further, the first detection circuit for performing sintering detection on the contactor via an indirect connection includes: in response to the linkage device of the first detection circuit being linked to the contactor, acquiring the state of the linkage device; and determining whether the contactor is sintered or not based on the state of the linkage device.

[0055] In one embodiment, the linkage device includes an auxiliary contact, which is linked to the contactor. Further, the auxiliary contact includes normally open and normally closed types. When the auxiliary contact is normally open, the linkage between the contactor and the auxiliary contact includes: when the contactor is closed, the auxiliary contact is closed; when the contactor is open, the auxiliary contact is open. When the auxiliary contact is normally closed, the linkage between the contactor and the auxiliary contact includes: when the contactor is closed, the auxiliary contact is open; when the contactor is open, the auxiliary contact is closed.

[0056] For example, the first detection circuit 300 includes: an auxiliary contact linked to the contactor; a diode D1 connected in series with the auxiliary contact; a voltage divider circuit including at least two voltage divider resistors connected in series; and a first sampling circuit for acquiring a sampling voltage. Further, when the auxiliary contact is closed, the first sampling circuit acquires the voltage drop across the diode; when the auxiliary contact is open, the first sampling circuit acquires the voltage across the voltage divider resistors.

[0057] In one embodiment, such as Figure 1 As shown, the first detection circuit 300 includes an independent power supply Vcc. 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. When the auxiliary contact K4' is open, the first sampling circuit V1 obtains the voltage across the third voltage divider resistor.

[0058] For example, the contactor sintering detection circuit further includes a second detection circuit, which is used to perform sintering detection on the contactor through a direct connection. Furthermore, the two ends of the second detection circuit are respectively connected to the two ends of the contactor to perform sintering detection on the contactor through a direct connection.

[0059] In one embodiment, the first terminal of the second detection circuit 400 is directly connected to the DC charging port. During DC charging, the validity of the second detection circuit is detected. The first terminal of the second detection circuit is connected to the power battery via the contactor. When the contactor is disconnected, the second detection circuit is used for sintering detection of the contactor. When sintering detection is performed on the DC charging positive contactor K4, the auxiliary contact of the first detection circuit 300 is the auxiliary contact K4' of the DC charging positive contactor K4. The first terminal of the second detection circuit is directly connected to the positive terminal of the DC charging port. The first terminal of the second detection circuit is connected to the positive terminal of the power battery via the DC charging positive contactor K4. The second terminal of the second detection circuit is connected to the negative terminal of the DC charging port via the DC charging negative contactor K5. The second terminal of the second detection circuit is directly connected to the negative terminal of the power battery.

[0060] For example, the second detection circuit includes a detection switch, a sampling resistor, and a second sampling circuit, wherein the detection switch and the sampling resistor are connected in series, and the second sampling circuit is used to acquire the sampling voltage.

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

[0062] In one embodiment, when the second detection circuit performs a sintering detection on the contactor, the DC charging positive contactor K4 is open and the battery positive 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 through an indirect connection.

[0064] For example, the first detection circuit performs sintering detection on the contactor through an indirect connection, including: responding to the linkage device of the first detection circuit and the contactor to linkage, obtaining the state of the linkage device; and determining whether the contactor is sintered or not based on the state of the linkage device.

[0065] In one embodiment, the first detection circuit performs sintering detection on the contactor via an indirect connection, including: disconnecting the contactor; responding to the linkage between the auxiliary contact of the first detection circuit and the contactor, wherein the state of the auxiliary contact is a preset state, acquiring the voltage of the first sampling circuit; when the voltage acquired 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 sintered; when the voltage acquired 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 sintered.

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

[0067] The effectiveness of the first detection circuit is determined based on the linkage between the contactor and the auxiliary contact.

[0068] The effectiveness of the second detection circuit is determined based on the voltage across the sampling resistor.

[0069] When the first detection circuit and / or the second detection circuit are active, the contactor is detected to determine whether sintering has occurred.

[0070] First, based on the linkage between the contactor and the auxiliary contact, the validity of the first detection circuit is determined as follows: when the contactor is in the first state and the state of the auxiliary contact is consistent with the preset state, the first detection circuit is determined to be valid; when the contactor is in the first state and the state of the auxiliary contact is inconsistent with the preset state, the first detection circuit is determined to be invalid.

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

[0072] Next, based on the voltage of the sampling resistor, the validity of the second detection circuit is determined as follows: when DC charging, the detection switch is closed, and when the voltage obtained by the second sampling circuit is the preset voltage division of the sampling resistor, the second detection circuit is valid; when the voltage obtained by the second sampling circuit is not the preset voltage division 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 validity determination of the second detection circuit 400 needs to be performed during DC charging. (Refer to...) Figure 3 During DC charging, the DC charging positive contactor K4, DC charging negative contactor K5, battery positive contactor K2, and battery negative contactor K3 are all closed. The DC charging voltage is U. When the voltage obtained by the second sampling circuit V2 is the preset voltage division of the sampling resistor R6, U*R6 / (R5+R6), the second detection circuit 400 is effective. When the voltage obtained by the second sampling circuit V2 is zero or deviates significantly from the preset voltage division of the sampling resistor R6, U*R6 / (R5+R6), the second detection circuit 400 fails.

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

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

[0076] In one embodiment, such as Figure 4 As shown, when the first detection circuit 300 is effective and the second detection circuit 400 is ineffective, the first detection circuit 300 is used for contactor sintering detection; when the first detection circuit 300 is ineffective and the second detection circuit 400 is effective, the second detection circuit 400 is used for contactor sintering detection; when both the first detection circuit 300 and the second detection circuit 400 are effective, both the first detection circuit 300 and the second detection circuit 400 are used for contactor sintering detection; when both the first detection circuit 300 and the second detection circuit 400 are ineffective, contactor sintering detection cannot be performed.

[0077] For example, when the first detection circuit is active, detecting whether the contactor has sintered includes: disconnecting the contactor, the state of the auxiliary contact being a preset state, and 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 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 has sintered.

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

[0079] For example, when the second detection circuit is active, detecting whether the contactor has sintered includes: ending DC charging, disconnecting the contactor, and when the voltage of the sampling resistor obtained by the second sampling circuit is not zero, the contactor has sintered; when the voltage of the sampling resistor obtained by the second sampling circuit is zero, the contactor has 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 DC charging is completed. At this time, both the DC charging positive contactor K4 and the DC charging negative contactor K5 are open. Since the second detection circuit 400 does not include an independent power supply, the battery positive contactor K2 is closed when the sintering detection of the DC charging positive contactor K4 is performed. When the voltage across the sampling resistor R6 obtained by the second sampling circuit is zero, the DC charging positive contactor K4 has not sintered; when the voltage across the sampling resistor R6 obtained by the second sampling circuit is U*R6 / (R5+R6), the DC charging positive contactor K4 has sintered.

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

[0082] The present invention also provides a storage medium storing a computer program that, when run, executes the contactor sintering detection method as described above.

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

[0084] The present invention also provides a vehicle including the battery system 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 through an indirect connection, providing a new detection method for contactor sintering detection.

[0086] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A contactor sintering detection circuit, characterized in that, Includes a first detection circuit, which is used to perform sintering detection on the contactor through an indirect connection; The second detection circuit is used to perform sintering detection on the contactor by direct connection. The first detection circuit includes: Auxiliary contact, which is linked to the contactor; A diode, wherein the diode is connected in series with the auxiliary contact; A voltage divider circuit includes at least two voltage divider resistors connected in series; wherein the diode is connected in parallel with a portion of the voltage divider resistors; and The first sampling circuit is used to acquire the sampling voltage; 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 part of the voltage divider resistor; 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 acquire a sampling voltage. The sampling resistor includes a first sampling resistor and a second sampling resistor connected in series. The detection switch is connected between the first terminal of the second detection circuit and the first sampling resistor. The second sampling circuit is used to acquire the voltage across the second sampling resistor. The contactor sintering detection circuit is configured as follows: The effectiveness of the first detection circuit and the effectiveness of the second detection circuit are determined respectively; When the first detection circuit and / or the second detection circuit are effective, the contactor is detected to determine whether sintering has occurred. Determining the effectiveness of the second detection circuit includes: When DC charging is performed and the detection switch is closed, the DC charging voltage is U. When the voltage obtained by the second sampling circuit is the preset voltage division of the sampling resistor, the second detection circuit is effective. When the voltage obtained by the second sampling circuit is not the preset voltage division of the sampling resistor, the second detection circuit is ineffective. The preset voltage division is U*R6 / (R5+R6), where R5 is the resistance value of the first sampling resistor and R6 is the resistance value of the second sampling resistor.

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

3. The contactor sintering detection circuit as described in claim 2, characterized in that, The first detection circuit is used to perform sintering detection on the contactor via indirect connection, including: The linkage device and contactor are linked in response to the first detection circuit to obtain the state of the linkage device; The state of the linkage device determines whether the contactor is sintered or not.

4. The contactor sintering detection circuit as described in claim 1, characterized in that, The linkage between the auxiliary contact and the contactor includes: When the contactor is closed, the auxiliary contact is closed; when the contactor is open, the auxiliary contact is open; or... When the contactor is closed, the auxiliary contact is open; when the contactor is open, the auxiliary contact is closed.

5. The contactor sintering detection circuit as described in claim 1, characterized in that, The first detection circuit also includes: a power supply; The voltage divider circuit includes a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected in series. The first voltage divider resistor is connected to the power supply, the second voltage divider resistor is connected between the first voltage divider resistor and the third voltage divider resistor, and the third voltage divider resistor is grounded. The diode is connected between the first voltage divider resistor and the first end of the auxiliary contact, the second end of the auxiliary contact is grounded, and the first branch formed by the diode and the auxiliary contact is connected in parallel with the second branch formed by the second voltage divider resistor and the third voltage divider resistor; The first sampling circuit is used to: obtain the voltage drop across the diode when the auxiliary contact is closed, and obtain the voltage across the third voltage divider resistor when the auxiliary contact is open.

6. The contactor sintering detection circuit as described in claim 1, characterized in that, The two ends of the second detection circuit are respectively connected to the two ends of the contactor.

7. A method for detecting the sintering of a contactor, characterized in that, The first detection circuit performs sintering detection on the contactor through an indirect connection. The second detection circuit performs sintering detection on the contactor through a direct connection. The first detection circuit includes: Auxiliary contact, which is linked to the contactor; A diode, wherein the diode is connected in series with the auxiliary contact; A voltage divider circuit includes at least two voltage divider resistors connected in series; wherein the diode is connected in parallel with a portion of the voltage divider resistors; and The first sampling circuit is used to acquire the sampling voltage; 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 part of the voltage divider resistor; 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 acquire a sampling voltage. The sampling resistor includes a first sampling resistor and a second sampling resistor connected in series. The detection switch is connected between the first terminal of the second detection circuit and the first sampling resistor. The second sampling circuit is used to acquire the voltage across the second sampling resistor. The method further includes: The effectiveness of the first detection circuit and the effectiveness of the second detection circuit are determined respectively; When the first detection circuit and / or the second detection circuit are effective, the contactor is detected to determine whether sintering has occurred. Determining the effectiveness of the second detection circuit includes: When DC charging is performed and the detection switch is closed, the DC charging voltage is U. When the voltage obtained by the second sampling circuit is the preset voltage division of the sampling resistor, the second detection circuit is effective. When the voltage obtained by the second sampling circuit is not the preset voltage division of the sampling resistor, the second detection circuit is ineffective. The preset voltage division is U*R6 / (R5+R6), where R5 is the resistance value of the first sampling resistor and R6 is the resistance value of the second sampling resistor.

8. The contactor sintering detection method as described in claim 7, characterized in that, The first detection circuit performs sintering detection on the contactor via indirect connection, including: The linkage device and contactor are linked in response to the first detection circuit to obtain the status of the linkage device; The state of the linkage device determines whether the contactor is sintered or not.

9. The contactor sintering detection method as described in claim 7, characterized in that, The first detection circuit performs sintering detection on the contactor via 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 does not sinter; 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 sinters.

10. A processing apparatus, characterized in that, include: A storage medium and a processor, wherein the storage medium stores a computer program executed by the processor, the computer program, when executed by the processor, causes the processor to perform the contactor sintering detection method as described in any one of claims 7-9.

11. A storage medium, characterized in that, The storage medium stores a computer program that, when run, executes the contactor sintering detection method as described in any one of claims 7-9.

12. A battery system, characterized in that, The contactor sintering detection circuit includes any one of claims 1-6.

13. A vehicle, characterized in that, Includes the battery system of claim 12.

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