Adhesion detection device of main negative contactor, battery pack and vehicle

Abstract

The utility model provides an adhesion detection device of a main negative contactor, a battery pack and a vehicle, the device is applied to the field of vehicles, a power supply module outputs a preset voltage when detecting the current state of the main negative contactor, a first end of a detection module is connected with the power supply module, and a second end of the detection module is connected with one end of the main negative contactor through a first acquisition point; the third end of the first acquisition module is connected with the other end of the main negative contactor and the acquisition module through the second acquisition point, and the acquisition module is connected with the detection module, the first acquisition point, the second acquisition point and the grounding node and used for acquiring voltages of the first acquisition point and the second acquisition point. And obtaining the current state of the main negative contactor according to the voltages of the first acquisition point and the second acquisition point. According to the method, the diagnosis voltage interval can be widened by adjusting the circuit parameters, the misinformation risk caused by the fact that the sampling precision, the X capacitor voltage upper limit and the matched resistor are affected by the temperature is avoided, and therefore the accuracy of detecting the adhesion state of the main negative contactor is improved.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more specifically, to a device for detecting adhesion of main and negative contactors, a battery pack, and a vehicle in the field of vehicles. Background Technology

[0002] With the development of the new energy vehicle industry, the battery management system (BMS) is the core of the vehicle's high-voltage system management and control. It is responsible for controlling the battery's operating status, collecting cell voltage and temperature data, diagnosing battery faults, and judging and detecting the high-voltage status of each high-voltage circuit in the battery pack. Among the functions of the BMS, accurately judging the high-voltage status of the high-voltage circuit in the battery pack and the sticking status of relays (such as main and negative relays) is crucial.

[0003] In related technologies, this task is usually accomplished by a high-voltage acquisition chip on the BMS. However, due to factors such as sampling accuracy, upper limit of X capacitor voltage, and temperature-dependent effects on matching resistors, there is a risk of false alarms, making it impossible to accurately determine the sticking status of the main negative contactor. This issue urgently needs to be addressed. Utility Model Content

[0004] This application provides a device for detecting adhesion of the main and negative contactors, a battery pack, and a vehicle. This method can widen the diagnostic voltage range by adjusting circuit parameters, avoiding the risk of false alarms caused by the influence of sampling accuracy, the upper limit of the X capacitor voltage, and the temperature of the matching resistor, thereby improving the accuracy of detecting the adhesion state of the main and negative contactors and the reliability of the battery management system.

[0005] In a first aspect, a device for detecting adhesion of a main negative contactor is provided. The device includes a power supply module, a detection module, and a data acquisition module. The power supply module outputs a preset voltage when detecting the current state of the main negative contactor. A first terminal of the detection module is connected to the power supply module, a second terminal of the detection module is connected to one end of the main negative contactor via a first data acquisition point, and a third terminal of the detection module is connected to the other end of the main negative contactor and the data acquisition module via a second data acquisition point. The data acquisition module is connected to the detection module, the first data acquisition point, the second data acquisition point, and a grounding node, respectively, and is used to acquire the voltage at the first data acquisition point and the voltage at the second data acquisition point to determine the current state of the main negative contactor based on the voltage at the first data acquisition point and the voltage at the second data acquisition point.

[0006] By adjusting the circuit parameters, the diagnostic voltage range can be widened, avoiding the risk of false alarms caused by the influence of sampling accuracy, the upper limit of X capacitor voltage, and the temperature of the matching resistor. This improves the accuracy of detecting the sticking state of the main and negative contactors and the reliability of the battery management system.

[0007] In conjunction with the first aspect, in some possible implementations, the detection module includes: a first to a third resistor, a vehicle architecture total voltage acquisition matching resistor, a first diode, a second diode, and a capacitor. One end of the first resistor is connected to the power supply module, and the other end of the first resistor is connected to one end of the third resistor via the first acquisition point. One end of the second resistor is connected to the first end of the acquisition module, and the other end of the second resistor is connected to the first acquisition point. The other end of the third resistor is connected to the anode of the first diode. The cathode of the first diode is connected to one end of the main negative contactor and the negative terminal of the capacitor, respectively. The positive terminal of the capacitor is connected to the first end of the vehicle architecture total voltage acquisition matching resistor. The second end of the vehicle architecture total voltage acquisition matching resistor is connected to the third end of the acquisition module, and the grounding terminal of the vehicle architecture total voltage acquisition matching resistor is connected to the grounding node. The anode of the second diode is connected to the second end of the acquisition module, the other end of the main negative contactor, and the grounding node via the second acquisition point, respectively. The cathode of the second diode is connected to the first end of the acquisition module and one end of the second resistor, respectively.

[0008] The above technical solution utilizes a detection module to detect the current state of the main negative contactor based on the voltages of the first and second acquisition points, thereby improving detection accuracy.

[0009] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the total voltage acquisition matching resistor of the vehicle architecture includes: a fourth resistor, one end of which is connected to the positive terminal of the capacitor; and a fifth resistor, one end of which is connected to the other end of the fourth resistor and the third terminal of the acquisition module, and the other end of which is connected to the grounding node.

[0010] The above technical solution determines the sampling voltage by setting and adjusting the fourth and fifth resistors, thus ensuring that the main negative contactor can be accurately judged as stuck under different conditions.

[0011] In combination with the first aspect and the above implementation, in some possible implementations, the adhesion detection device for the main negative contactor further includes: a detection switch disposed between the first acquisition point and the other end of the first resistor, which is used to be in a closed state when a detection command is received, so as to perform adhesion detection on the main negative contactor.

[0012] The above technical solution allows for adhesion detection by using a detection switch when the main negative contactor is in a closed state.

[0013] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the detection switch includes: a power supply component; an optocoupler, the input terminal of which is connected to the other end of the first resistor, the output terminal of which is connected to one end of the third resistor through the first acquisition point, and the power input terminal of which is connected to the power supply component; and a switching unit, one end of which is connected to the ground terminal of the optocoupler, and the other end of which is connected to the grounding node.

[0014] The above technical solution detects the sticking status of the main and negative contactors by using a detection switch, ensuring that the electric vehicle battery management system can accurately determine whether the main and negative contactors are in a normal closed or open state, thus avoiding safety hazards caused by contactor sticking.

[0015] In combination with the first aspect and the above-described implementation methods, in some possible implementation methods, the power supply module includes an isolated power supply.

[0016] The above technical solution provides electrical isolation between the low-voltage control signal and the high-voltage power supply, ensuring that the signal on the low-voltage side is not affected by the high-voltage side.

[0017] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the above-mentioned adhesion detection device for the main and negative contactors further includes: a reminder module for providing an adhesion reminder based on the adhesion reminder signal; and a control module, which is connected to the acquisition module and the reminder module respectively, for generating the adhesion reminder signal when the current state of the main and negative contactors is an adhesion state.

[0018] Through the above technical solution, the reminder module can generate an adhesion reminder signal when the current state of the main negative contactor is adhesion, so that timely correction can be made.

[0019] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the adhesion detection device of the main negative contactor mentioned above further includes: an isolation module disposed between the control module and the acquisition module, for providing an isolation voltage.

[0020] The above technical solution ensures that the microcontroller inside the BMS can safely receive signals from the high-voltage acquisition chip, while protecting the low-voltage circuit from the influence of the high-voltage system.

[0021] Secondly, a battery pack is provided, which includes an adhesion detection device for the main negative contactor as described in any of the above embodiments.

[0022] Thirdly, a vehicle is provided, including the battery pack described in the above embodiments. Attached Figure Description

[0023] Figure 1 This is a diagram of the high-voltage power system architecture for related technologies;

[0024] Figure 2 A schematic diagram of the adhesion detection device for the main negative contactor provided in the embodiments of this application;

[0025] Figure 3 This is a circuit flowchart of one embodiment of this application;

[0026] Figure 4 This is a schematic diagram of a circuit design according to an embodiment of this application. Detailed Implementation

[0027] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0028] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] With the development of the new energy vehicle industry, the battery management system (BMS), as the core of the vehicle's high-voltage system management and control, is responsible for controlling the battery's operating status, collecting cell voltage and temperature data, diagnosing battery faults, and judging and detecting the high-voltage status of each high-voltage circuit within the battery pack. Figure 1 As shown, the current components of a new energy vehicle include: a power battery pack, relays (including main positive relays, main negative relays, pre-charge relays, pre-charge resistors, fuses, circuit breakers, various controllers, and some loads). In the functions of the Battery Management System (BMS), accurately determining the high-voltage status of the high-voltage circuit within the battery pack and the sticking status of relays (such as the main negative relays) is crucial. However, due to factors such as sampling accuracy, the upper limit of the X capacitor voltage, and the temperature-dependent effects on the matching resistor, performing this task through the high-voltage acquisition chip on the BMS can easily lead to false alarms, making it impossible to accurately determine the sticking status of the main negative contactor. Therefore, this embodiment of the application widens the diagnostic voltage range by adjusting circuit parameters, avoiding the risk of false alarms caused by the influence of sampling accuracy, the upper limit of the X capacitor voltage, and the temperature-dependent effects on the matching resistor, thereby improving the accuracy of detecting the sticking status of the main negative contactor and the reliability of the battery management system.

[0030] Figure 2 This is a schematic diagram of an adhesion detection device for a main and negative contactor provided in an embodiment of this application.

[0031] For example, such as Figure 2 As shown, the device 10 includes a power supply module 100, a detection module 200, and a data acquisition module 300.

[0032] The power supply module 100 outputs a preset voltage when detecting the current state of the main negative contactor. The first end of the detection module 200 is connected to the power supply module 100, the second end of the detection module 200 is connected to one end of the main negative contactor through the first acquisition point, and the third end of the detection module 200 is connected to the other end of the main negative contactor and the acquisition module 300 through the second acquisition point. The acquisition module 300 is connected to the detection module 200, the first acquisition point, the second acquisition point, and the grounding node, respectively, and is used to acquire the voltage of the first acquisition point and the voltage of the second acquisition point, so as to obtain the current state of the main negative contactor based on the voltage of the first acquisition point and the voltage of the second acquisition point.

[0033] Optionally, in one embodiment of this application, the detection module 200 includes: a first to a third resistor, a vehicle architecture total voltage acquisition matching resistor, a first diode, a second diode, and a capacitor. One end of the first resistor is connected to the power supply module 100, and the other end of the first resistor is connected to one end of the third resistor via a first acquisition point. One end of the second resistor is connected to the first end of the acquisition module 300, and the other end of the second resistor is connected to the first acquisition point. The other end of the third resistor is connected to the anode of the first diode. The cathode of the first diode is connected to one end of the main negative contactor and the negative terminal of the capacitor, respectively. The positive terminal of the capacitor is connected to the first end of the vehicle architecture total voltage acquisition matching resistor. The second end of the vehicle architecture total voltage acquisition matching resistor is connected to the third end of the acquisition module 300, and the grounding terminal of the vehicle architecture total voltage acquisition matching resistor is connected to a grounding node. The anode of the second diode is connected to the second end of the acquisition module 300, the other end of the main negative contactor, and the grounding node via a second acquisition point, respectively. The cathode of the second diode is connected to the first end of the acquisition module 300 and one end of the second resistor, respectively.

[0034] The preset voltage can be set by those skilled in the art according to actual monitoring needs, or it can be obtained through a limited number of computer simulations; no specific limitation is made here.

[0035] Specifically, the embodiments of this application mainly determine the adhesion status of the main negative contactor by adjusting the diagnostic voltage range, such as... Figure 3 As shown, the detection of the adhesion status of the main and negative contactors in this embodiment of the application consists of a high-voltage acquisition chip, an isolation chip, a microcontroller, and analog signals inside the BMS.

[0036] Specifically, if Figure 4 As shown, the power supply module 100 in this embodiment includes an isolated power supply, which can be selected from 5V and 2.5V, i.e., ISO_5V and ISO_2.5V, that is, the isolated power supply is adjusted to the 2.5V-5V range. The detection module 200 includes a first resistor R1, a second resistor R2, a third resistor R3, a total voltage acquisition matching resistor of 6M and 43kV for the whole vehicle architecture, a first diode, a second diode, and a capacitor Vx_capacitor. One end of the first resistor R1 is connected to the power supply module 100 (e.g., ...). Figure 4 The first resistor R1 is connected to the ISO_5V of the acquisition module 300. The other end of the first resistor R1 is connected to one end of the third resistor R3 through the first acquisition point A. One end of the second resistor R2 is connected to the first end of the acquisition module 300. The other end of the second resistor R2 is connected to the first acquisition point A. The other end of the third resistor R3 is connected to the anode of the first diode. The cathode of the first diode is connected to one end of the main negative contactor and the negative terminal of the capacitor Vx_capacitor. The positive terminal of the capacitor Vx_capacitor is connected to the first end of the total voltage acquisition matching resistor of the vehicle architecture. The second end of the total voltage acquisition matching resistor of the vehicle architecture is connected to the third end of the acquisition module 300 (i.e., the high voltage acquisition chip). The grounding terminal of the total voltage acquisition matching resistor of the vehicle architecture is connected to the grounding node. The anode of the second diode is connected to the second end of the acquisition module 300, the other end of the main negative contactor, and the grounding node through the second acquisition point A0. The cathode of the second diode is connected to the first end of the acquisition module 300 and one end of the second resistor R2.

[0037] Optionally, in one embodiment of this application, the total voltage acquisition matching resistor for the vehicle architecture includes: a fourth resistor, one end of which is connected to the positive terminal of a capacitor; and a fifth resistor, one end of which is connected to the other end of the fourth resistor and the third terminal of the acquisition module 300, and the other end of which is connected to a grounding node.

[0038] Specifically, if Figure 4 As shown, the total voltage acquisition matching resistor of the vehicle architecture includes a fourth resistor 6M and a fifth resistor 43k. One end of the fourth resistor 6M is connected to the positive terminal of the capacitor Vx_capacitor. One end of the fifth resistor 43k is connected to the other end of the fourth resistor 6M and the third terminal of the acquisition module 300. The other end of the fifth resistor 43k is connected to the grounding node.

[0039] Optionally, in one embodiment of this application, the above-mentioned adhesion detection device for the main negative contactor further includes: a detection switch disposed between the first acquisition point and the other end of the first resistor, which is used to be in a closed state when a detection command is received, so as to perform adhesion detection on the main negative contactor.

[0040] Optionally, in one embodiment of this application, the detection switch includes: a power supply component; an optocoupler, the input terminal of which is connected to the other end of a first resistor, the output terminal of which is connected to one end of a third resistor through a first acquisition point, and the power input terminal of which is connected to the power supply component; and a switching unit, one end of which is connected to the ground terminal of the optocoupler, and the other end of which is connected to a grounding node.

[0041] Specifically, if Figure 4 As shown, the adhesion detection device for the main negative contactor in this embodiment of the application further includes a detection switch disposed between the first acquisition point A and the other end of the first resistor R1. When a detection command is received, the switch is in a closed state to detect adhesion of the main negative contactor. The detection switch includes a power supply component, an optocoupler, and a switching unit. The input terminal of the optocoupler is connected to the other end of the first resistor R1, the output terminal of the optocoupler is connected to one end of the third resistor R3 through the first acquisition point A, and the power input terminal of the optocoupler is connected to the power supply component (5V) to isolate the power supply after the optocoupler is turned on.

[0042] Optionally, in one embodiment of this application, the above-mentioned adhesion detection device for the main and negative contactors further includes: a reminder module for providing an adhesion reminder based on an adhesion reminder signal; and a control module, which is connected to the acquisition module 300 and the reminder module respectively, for generating an adhesion reminder signal when the current state of the main and negative contactors is an adhesion state.

[0043] Specifically, the embodiments of this application also include a reminder module, which can generate an adhesion reminder signal when the current state of the main negative contactor is an adhesion state, so as to promptly remind the user that the main negative contactor is in an adhesion state and ensure user safety.

[0044] Optionally, in one embodiment of this application, the adhesion detection device of the main negative contactor described above further includes: an isolation module disposed between the control module and the acquisition module 300, for providing an isolation voltage.

[0045] Specifically, in this embodiment, an isolation voltage is provided by an isolation module to establish electrical isolation between the low-voltage control signal and the high-voltage power supply, thereby preventing any current from the high-voltage side from entering the low-voltage side, thus protecting the circuit on the low-voltage side from the influence of high voltage, and also protecting the safety of the system operators.

[0046] To enable those skilled in the art to better understand the monitoring scheme of the embodiments of this application, the following description will be provided in conjunction with specific embodiments.

[0047] Specifically, if Figure 4As shown, as one feasible method, after the optocoupler is turned on, the isolation power supply ISO_5V is adjusted, the matching resistor R1 has a resistance of 4.7kΩ and the resistor R3 has a resistance of 1kΩ. The diagnostic sampling voltage of the main negative contactor is the voltage drop from point A to point A0, i.e. When the BMS diagnostic sampling voltage is less than or equal to 2.5V, the main negative contactor is considered closed; when it is greater than 2.5V, the main negative contactor is considered open. The voltage range is (0V-5V), corresponding to a Vx_capacitor voltage of (6434.78V-0V); when Vx_capacitor is greater than 6434.78V, Only 0V can be detected. After adjusting the isolation power supply, it can be determined that... When the voltage is less than or equal to 2.5V, the main negative contactor is in the closed state, and the corresponding Vx_capacitor is greater than or equal to 3217.39V.

[0048] If the main negative contactor is in the open state, the voltage drop from point A to point A0 can be obtained as follows: =5-[(Vx_capacitor-0.5) / (6000+43+4.7+1)]*4.7

[0049] ,Right now =5-[(3217.39-0.5) / (6000+43+4.7+1)]*4.7=4.468V, which is greater than or equal to 2.5V, therefore it will not cause a misdiagnosis of the main negative contactor; if the main negative contactor is in the closed state, the voltage drop from point A to point A0 is, =[(5V-0.5V)*1 / (4.7+1)]+0.5V=0.789+0.5=1.289V<2.5V, which meets the diagnostic criteria. At this time, the voltage at the outer end of the main negative contactor can be obtained. When the power-down operation is performed, the main negative contactor is disconnected, the voltage at point A is raised, and the diagnostic voltage is pulled up to above 2.5V. The voltage is greater than 2.5V in the diagnostic range, so there will be no false alarm of the main negative contactor sticking.

[0050] Furthermore, as another feasible method, after the optocoupler is turned on, adjust the isolation power supply ISO_2.5V, the matching resistor R1 to a value of 20kΩ and the resistor R3 to a value of 10kΩ. The diagnostic sampling voltage of the main negative contactor is the voltage drop between point A and A0. If the BMS diagnostic sampling voltage is less than or equal to 1.5V, the contactor is considered closed; if it is greater than 1.5V, the main negative contactor is considered open. At this time, The voltage range is (0V-5V), and the corresponding Vx_capacitor voltage is (759.125V-0V). When Vx_capacitor is greater than 759.125V, Only 0V can be obtained. After adjusting the isolation power supply, it can be determined that... A value less than or equal to 1.5V indicates a closed state, and the corresponding Vx_capacitor is greater than or equal to 303.65V.

[0051] If the main negative contactor is in the open state, the voltage drop from point A to point A0 can be obtained as follows:

[0052] =2.5-[(Vx_capacitor-0.5) / (6000+43+20+10)]*20

[0053] Right now =2.5-[(303.65-0.5) / (6000+43+20+10)]*20=1.497V≈1.5V, therefore it may cause a misdiagnosis of the main negative contactor sticking; if the main negative contactor is in the closed state, at this time, =[(2.5V-0.5V)*10 / (20+10)]+0.5V=0.667+0.5=1.167V is less than 1.5V, which meets the diagnostic criteria. At this time, the voltage at the outer terminal of the main negative contactor can be obtained. When the power-down operation is performed, the main negative contactor is disconnected, the voltage at point A decreases, and the diagnostic voltage is pulled down to below 1.5V. If the voltage is less than 1.5V in the diagnostic range, a false alarm of main negative contactor sticking will be reported.

[0054] It should be noted that the voltage drop of the first diode is 0.5V. Since the first diode is connected to the high-voltage acquisition chip, it will have a forward conduction voltage drop of about 0.5V when the current flows in the forward direction. Therefore, when calculating the diagnostic voltage, the voltage drop of this diode needs to be subtracted from the total voltage in order to obtain the actual sampling voltage value.

[0055] Therefore, by adjusting the parameters, the embodiments of this application can still accurately detect the sticking state of the main and negative relays under abnormal voltage rise during high-voltage power-off, and its circuit design is simple and easy to implement.

[0056] In summary, according to the adhesion detection device for the main and negative contactors according to the embodiments of this application, the power supply module outputs a preset voltage when detecting the current state of the main and negative contactors. The first terminal of the detection module is connected to the power supply module, its second terminal is connected to one end of the main and negative contactor through a first acquisition point, and its third terminal is connected to the other end of the main and negative contactor and the acquisition module through a second acquisition point. The acquisition module is connected to the detection module, the first acquisition point, the second acquisition point, and the grounding node, respectively, and is used to acquire the voltages of the first acquisition point and the second acquisition point to obtain the current state of the main and negative contactors based on the voltages of the first acquisition point and the second acquisition point. This method solves the problem that the adhesion state of the main and negative contactors is easily affected by factors such as sampling accuracy, the upper limit of the X capacitor voltage, and the temperature-dependent influence of the matching resistor, which can easily lead to false alarms and thus make it impossible to accurately determine the adhesion state of the main and negative contactors. This method can widen the diagnostic voltage range by adjusting the circuit parameters, avoiding the risk of false alarms caused by the influence of sampling accuracy, the upper limit of the X capacitor voltage, and the temperature-dependent influence of the matching resistor, thereby improving the accuracy of detecting the adhesion state of the main and negative contactors and the reliability of the battery management system.

[0057] Furthermore, this application provides a battery pack that includes an adhesion detection device for the main negative contactor of any of the above embodiments.

[0058] The battery pack according to the embodiments of this application solves the problem that the sampling accuracy, the upper limit of the X capacitor voltage, and the temperature-dependent influence of the matching resistor can easily lead to false alarms, thus making it impossible to accurately determine the sticking state of the main negative contactor. The method can widen the diagnostic voltage range by adjusting the circuit parameters, avoiding the risk of false alarms caused by the temperature-dependent influence of the sampling accuracy, the upper limit of the X capacitor voltage, and the matching resistor, thereby improving the accuracy of detecting the sticking state of the main negative contactor and the reliability of the battery management system.

[0059] Furthermore, this application provides a vehicle equipped with the battery pack of the above embodiment, which solves the problem that the risk of false alarms is easily caused by factors such as sampling accuracy, the upper limit of X capacitor voltage, and the temperature-dependent influence of matching resistor, thus making it impossible to accurately determine the adhesion status of the main and negative contactors. This method can widen the diagnostic voltage range by adjusting circuit parameters, avoiding the risk of false alarms caused by the temperature-dependent influence of sampling accuracy, the upper limit of X capacitor voltage, and matching resistor, thereby improving the accuracy of detecting the adhesion status of the main and negative contactors and the reliability of the battery management system.

Claims

1. A device for detecting adhesion in a main negative contactor, characterized in that, include: The module consists of a power supply module, a detection module, and a data acquisition module. The power supply module outputs a preset voltage when detecting the current state of the main negative contactor; The first end of the detection module is connected to the power supply module, the second end of the detection module is connected to one end of the main negative contactor through the first acquisition point, and the third end of the detection module is connected to the other end of the main negative contactor and the acquisition module through the second acquisition point. The acquisition module is connected to the detection module, the first acquisition point, the second acquisition point, and the grounding node, respectively, and is used to acquire the voltage of the first acquisition point and the voltage of the second acquisition point, so as to obtain the current state of the main negative contactor based on the voltage of the first acquisition point and the voltage of the second acquisition point.

2. The adhesion detection device for the main negative contactor according to claim 1, characterized in that, The detection module includes: first to third resistors, a total voltage acquisition matching resistor for the vehicle architecture, a first diode, a second diode, and a capacitor, wherein... One end of the first resistor is connected to the power supply module, and the other end of the first resistor is connected to one end of the third resistor through the first acquisition point. One end of the second resistor is connected to the first end of the acquisition module, and the other end of the second resistor is connected to the first acquisition point. The other end of the third resistor is connected to the anode of the first diode; The cathode of the first diode is connected to one end of the main negative contactor and the negative terminal of the capacitor, respectively. The positive terminal of the capacitor is connected to the first terminal of the total voltage acquisition matching resistor of the vehicle architecture; The second terminal of the total voltage acquisition matching resistor of the vehicle architecture is connected to the third terminal of the acquisition module, and the ground terminal of the total voltage acquisition matching resistor of the vehicle architecture is connected to the grounding node; The anode of the second diode is connected to the second terminal of the acquisition module, the other terminal of the main negative contactor, and the grounding node through the second acquisition point, and the cathode of the second diode is connected to the first terminal of the acquisition module and one terminal of the second resistor.

3. The adhesion detection device for the main negative contactor according to claim 2, characterized in that, The total voltage acquisition matching resistor for the vehicle architecture includes: A fourth resistor, one end of which is connected to the positive terminal of the capacitor; The fifth resistor has one end connected to the other end of the fourth resistor and the third end of the acquisition module, and the other end connected to the grounding node.

4. The adhesion detection device for the main negative contactor according to claim 2, characterized in that, Also includes: A detection switch, located between the first acquisition point and the other end of the first resistor, is used to be closed when a detection command is received, so as to perform adhesion detection on the main negative contactor.

5. The adhesion detection device for the main negative contactor according to claim 4, characterized in that, The detection switch includes: Power supply components; An optocoupler, wherein the input terminal of the optocoupler is connected to the other end of the first resistor, the output terminal of the optocoupler is connected to one end of the third resistor through the first acquisition point, and the power input terminal of the optocoupler is connected to the power supply component; A switching unit, one end of which is connected to the ground terminal of the optocoupler, and the other end of which is connected to the grounding node.

6. The adhesion detection device for the main negative contactor according to claim 1, characterized in that, The power supply module includes an isolated power supply.

7. The adhesion detection device for the main negative contactor according to claim 1, characterized in that, Also includes: A reminder module for providing adhesion reminders based on adhesion reminder signals; A control module, which is connected to both the acquisition module and the reminder module, is used to generate an adhesion reminder signal when the current state of the main negative contactor is an adhesion state.

8. The adhesion detection device for the main negative contactor according to claim 7, characterized in that, Also includes: An isolation module is installed between the control module and the acquisition module to provide isolation voltage.

9. A battery pack, characterized in that, include: The adhesion detection device for the main negative contactor as described in any one of claims 1-8.

10. A vehicle, characterized in that, include: The battery pack as described in claim 9.

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