Cathode side relay adhesion detection circuit, battery pack and vehicle

Abstract

The utility model relates to the technical field of vehicles, in particular to a cathode side relay adhesion detection circuit, a battery pack and a vehicle, the circuit comprises a power supply assembly, a switch assembly and a detection assembly, the power supply assembly is used for outputting a preset voltage; the detection assembly comprises a voltage acquisition point, the first end of the detection assembly is connected with one end of the negative side relay, the second end of the detection assembly is connected with the other end of the negative side relay, and the detection assembly is used for obtaining the current state of the negative side relay according to the voltage value of the voltage acquisition point when the switch assembly is in the closed state. Therefore, the problems that an existing detection method is low in accuracy and limited by a whole vehicle electrical network are solved, and the reliability and safety of detection are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a negative-side relay adhesion detection circuit, a battery pack, and a vehicle. Background Technology

[0002] With the increasing prevalence of commercial electric vehicles, the safety of battery systems has become paramount. To ensure the safety and reliability of the battery pack, two relays—one positive and one negative—are typically used to control the energy output to the load. The status of these relays is crucial to ensuring the safety of the battery pack. Therefore, accurately detecting the relay status and responding promptly to sticking faults is key to ensuring the safe operation of electric vehicles.

[0003] In related technologies, relay status detection currently mainly relies on detecting the voltage across the relay in both open and closed states. For negative relays, common detection methods include differential voltage detection and high-voltage detection methods using the main negative voltage as a reference. On one hand, differential voltage detection involves connecting a resistor string in series between the positive terminal of the battery pack and the downstream stage of the relay under test, and sampling the voltage across the sampling resistor in the middle of the resistor string. This voltage is then processed by an AD conversion circuit to determine the relay's status. On the other hand, the high-voltage detection method using the main negative voltage as a reference uses the negative voltage as a reference level, detecting the voltage between the sampling resistor and the negative terminal to determine the relay's status.

[0004] However, the differential voltage detection method can only detect the state of one relay at a time. If multiple relays are detected simultaneously, the parallel effect of the resistor series will lead to inaccurate voltage values, affecting the detection results. Furthermore, the high-voltage detection method using the main negative voltage as a reference is limited by the vehicle's electrical network. That is, this method relies on the residual voltage value of the load when the relay is disconnected. When the load is electrically isolated and there is no residual voltage, this detection method will not function properly, requiring a solution. Utility Model Content

[0005] This application provides a negative-side relay adhesion detection circuit, a battery pack, and a vehicle to solve the problems of low accuracy and limitation by the vehicle's electrical network in existing detection methods, thereby improving the reliability and safety of the detection.

[0006] A first aspect of this application provides a negative-side relay adhesion detection circuit, comprising: a power supply component, a switching component, and a detection component, wherein...

[0007] The power supply component is used to output a preset voltage;

[0008] The detection component includes a voltage acquisition point, and a first end of the detection component is connected to one end of the negative side relay, a second end of the detection component is connected to the other end of the negative side relay, and the voltage acquisition point is located between the third end of the detection component and the switch component. The detection component is used to obtain the current state of the negative side relay based on the voltage value of the voltage acquisition point when the switch component is in the closed state.

[0009] Optionally, in some embodiments, the detection component includes:

[0010] A first resistor, one end of which is connected to the output terminal of the power supply assembly, and the other end of which is connected to the switching assembly;

[0011] A diode, wherein the anode of the diode is connected to the switching assembly, and the cathode of the diode is connected to the switching assembly;

[0012] The second resistor has one end connected to the cathode of the diode and the switching assembly, and the other end connected to the other end of the negative-side relay.

[0013] A third resistor, one end of which is connected to the switching assembly, and the other end of which is connected to the connection node between the negative terminal of the battery and one end of the negative terminal relay.

[0014] Optionally, in some embodiments, the detection component further includes:

[0015] A capacitor, one end of which is connected to one end of the second resistor, and the other end of which is connected to the other end of the second resistor.

[0016] Optionally, in some embodiments, the switching assembly includes:

[0017] A first switch, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the anode of the diode;

[0018] The second switch has one end connected to the cathode of the diode and one end of the second resistor, and the other end connected to one end of the third resistor.

[0019] Optionally, in some embodiments, the detection component further includes:

[0020] The first detection unit is used to generate a negative-side relay sticking fault signal when the negative-side relay receives a disconnection command and the voltage value of the voltage acquisition point is less than a first preset threshold.

[0021] The second detection unit is used to generate a negative-side relay closing failure signal when the negative-side relay receives a closing command and the voltage value of the voltage acquisition point is greater than a second preset threshold.

[0022] Optionally, in some embodiments, the negative-side relay adhesion detection circuit further includes:

[0023] An alarm component is connected to both the first detection unit and the second detection unit. The alarm component is used to issue an alarm when the first detection unit outputs a negative-side relay sticking fault signal or when the second detection unit outputs a negative-side relay closing failure signal.

[0024] Optionally, in some embodiments, the alarm component includes:

[0025] An acoustic alarm unit is connected to the first detection unit and the second detection unit respectively. The acoustic alarm unit is used to provide an acoustic alarm reminder when the first detection unit outputs a fault signal of the negative side relay sticking, or when the second detection unit outputs a signal of the negative side relay failing to close.

[0026] And / or, an optical alarm unit, which is connected to the first detection unit and the second detection unit respectively, and is used to provide an optical alarm reminder when the first detection unit outputs a fault signal of the negative side relay sticking, or when the second detection unit outputs a signal of the negative side relay failing to close.

[0027] Optionally, in some embodiments, the negative-side relay adhesion detection circuit further includes:

[0028] A communication component is connected to the first detection unit and the second detection unit respectively. The communication component is used to send a fault status to a preset mobile terminal when the first detection unit outputs a negative-side relay sticking fault signal or the second detection unit outputs a negative-side relay closing failure signal.

[0029] According to the negative-side relay adhesion detection circuit provided in this application embodiment, upon receiving an adhesion detection request, the control power supply component outputs a preset voltage and controls the switch component to be in a closed state; the voltage value at the voltage acquisition point is obtained, and the current state of the negative-side relay is determined based on the voltage value at the voltage acquisition point. This solves the problems of low accuracy and limitation by the vehicle's electrical network in existing detection methods, improving the reliability and safety of the detection.

[0030] A second aspect of this application provides a battery pack including the negative-side relay adhesion detection circuit of the above embodiment.

[0031] According to the battery pack of this application embodiment, the above-mentioned negative-side relay adhesion detection circuit solves the problems of low accuracy and limitation by the vehicle electrical network in the existing detection methods. By adopting a low-voltage injection method on the other end of the negative-side relay, and using the main negative as the reference voltage point, the influence of residual voltage is shielded, and the state of the negative relay can be detected accurately and effectively without affecting the main positive relay detection circuit, and multiple relays can be detected simultaneously.

[0032] A third aspect of this application provides a vehicle that includes the battery pack described in the above embodiments.

[0033] According to the vehicle of the present application embodiment, the battery pack described above solves the problems of low accuracy and limitation by the vehicle's electrical network in existing detection methods. By using a low-voltage injection method on the other end of the negative relay, and taking the main negative as the reference voltage point, the influence of residual voltage is shielded, and the state of the negative relay can be detected accurately and effectively without affecting the detection circuit of the main positive relay. This allows for the simultaneous detection of multiple relays.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0036] Figure 1 This is a schematic diagram of a negative-side relay adhesion detection circuit according to an embodiment of this application. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] The following description, with reference to the accompanying drawings, describes an embodiment of the negative-side relay adhesion detection circuit, battery pack, and vehicle of this application. Addressing the issues of low accuracy and limitations imposed by the vehicle's electrical network in existing detection methods mentioned in the background, this application provides a negative-side relay adhesion detection circuit. Through low-voltage injection and a simple circuit structure, it effectively detects the state and adhesion faults of the negative relay, making the relay state controllable, ensuring its effective operation, and providing timely alarms when adhesion occurs, thus ensuring system safety.

[0039] Specifically, Figure 1 This is a schematic diagram of a negative-side relay adhesion detection circuit provided in an embodiment of this application.

[0040] like Figure 1 As shown, the negative-side relay adhesion detection circuit 10 includes: a power supply component 100, a switching component 200, and a detection component 300.

[0041] The power supply component 100 is used to output a preset voltage; the detection component includes a voltage acquisition point, and the first end of the detection component is connected to one end of the negative side relay, the second end of the detection component is connected to the other end of the negative side relay, and the voltage acquisition point is set between the third end of the detection component and the switch component. The detection component is used to obtain the current state of the negative side relay based on the voltage value of the voltage acquisition point when the switch component is in the closed state.

[0042] The power supply component 100 can be a DC power supply, with its voltage referenced to the relay on the main negative terminal of the battery, and is responsible for providing a preset low voltage. The preset voltage can be a voltage pre-set by those skilled in the art, such as 5V, and is not specifically limited here.

[0043] Therefore, in order to address the problem that existing low-voltage injection methods cause voltage fluctuations or false alarms due to voltage interference from other high-voltage acquisition resistors when the relay is disconnected, this invention avoids the above problems by setting a reference point, thereby ensuring system safety.

[0044] Specifically, such as Figure 1 As shown, Figure 1 The battery pack and load are essential components within the battery pack, and the relay on the negative side of the battery pack is the object to be tested. In this embodiment, the power supply component 100 is used as a low-voltage injection source, thereby avoiding the risk of high voltage through low-voltage injection. When a sticking detection request is received from the negative side relay, the power supply component 100 is controlled to output based on a preset voltage, and the switch component is controlled to be in a closed state. When the switch component is in a closed state, the current state of the negative side relay is obtained based on the voltage value U1 at the voltage acquisition point.

[0045] Alternatively, in some embodiments, such as Figure 1As shown, the switch assembly 200 includes: a first switch S1, one end of which is connected to the other end of a first resistor R1, and the other end of which is connected to the anode of a diode D1; and a second switch S2, one end of which is connected to the cathode of the diode D1 and one end of the second resistor R2, and the other end of which is connected to one end of a third resistor R3.

[0046] Specifically, in the switch assembly 200 of this application embodiment, the first switch S1 and the second switch S2 are used to be in the corresponding closed state when a sticking detection request for the negative side relay is received, so as to open the negative side relay sticking detection circuit to perform negative side relay sticking detection.

[0047] Furthermore, the first switch S1 and the second switch S2 in this embodiment can also be in the corresponding open state when no sticking detection requirement for the negative side relay is received, that is, when no sticking detection of the negative side relay is required, to prevent mutual interference between the detection circuit and the high voltage system.

[0048] Therefore, by controlling the state of the first switch S1 and the second switch S2, this embodiment of the application avoids the problem of the load end being energized after the system is powered off, and also eliminates the influence of other high-voltage detection circuits on the negative side relay adhesion detection circuit of this application.

[0049] Alternatively, in some embodiments, such as Figure 1 As shown, the detection component 300 includes: a first resistor R1, one end of which is connected to the output terminal of the power supply component 100, and the other end of which is connected to the switching component; a diode D1, the anode of which is connected to the switching component, and the cathode of which is connected to the switching component; a second resistor R2, one end of which is connected to the cathode of the diode D1 and the switching component, and the other end of which is connected to the other end of the negative-side relay; and a third resistor R3, one end of which is connected to the switching component, and the other end of which is connected to the connection node between the negative terminal of the battery and one end of the negative-side relay.

[0050] Specifically, the second resistor R2 and the third resistor R3 are connected in parallel and then connected in series with the first resistor R1. One end of the second resistor R2 and the third resistor R3 are shorted and connected to the protection diode D1, and the other end is connected to the two ends of the negative side relay.

[0051] Therefore, by introducing a second resistor R2 and a third resistor R3 at the two ends of the relay on the negative side, and adding a second switch S2 between the second resistor R2 and the third resistor R3, and adding a first switch S1 between the first resistor R1 and the second resistor R2, the detection circuit can have a reference at any time and will not experience voltage fluctuations.

[0052] Furthermore, the protection diode D1 in this embodiment can be a high-voltage diode D1. The diode D1 in the detection circuit of this application not only isolates the influence of the load residual voltage on the system, but also blocks the surge voltage at the negative load terminal, thereby achieving the protection function of the power supply component 100.

[0053] Optionally, in some embodiments, the detection component 300 further includes: a capacitor C1, one end of which is connected to one end of the second resistor R2, and the other end of which is connected to the other end of the second resistor R2.

[0054] Specifically, in this application embodiment, capacitor C1 can be a decoupling capacitor C1. In this application, capacitor C1 in the detection circuit can guide the AC components that are not needed by the system back to the reference point to prevent the detection voltage from jumping.

[0055] Optionally, in some embodiments, the detection component 300 further includes: a first detection unit, which is used to generate a negative-side relay sticking fault signal when the negative-side relay receives a disconnection command and the voltage value at the voltage acquisition point is less than a first preset threshold; and a second detection unit, which is used to generate a negative-side relay closing failure signal when the negative-side relay receives a closing command and the voltage value at the voltage acquisition point is greater than a second preset threshold.

[0056] Among them, the negative-side relay sticking fault refers to the relay failing to disconnect properly after receiving a disconnect command, causing its contacts to remain in contact. Closing failure refers to the relay failing to close successfully after receiving a closing command, resulting in its contacts failing to form a valid electrical connection.

[0057] Specifically, when the high-voltage system needs to detect the status of the negative-side relay, both the first switch S1 and the second switch S2 are closed. At this time, the power supply component 100 outputs a preset voltage through the first resistor R1, the first switch S1, the diode D1, the second resistor R2, and the negative-side relay to the reference point. Furthermore, the preset voltage output by the power supply component 100 also passes through the first resistor R1, the first switch S1, the diode D1, the second switch S2, and the third resistor R3 to the reference point. It should be noted that in this embodiment, the power supply component, the first resistor R1, the first switch S1, the diode D1, the second resistor R2, and the other end of the negative-side relay are connected sequentially. By using a low-voltage injection method at the other end of the negative-side relay, the influence of residual voltage is shielded, allowing for accurate and effective detection of the negative-side relay's status.

[0058] In theory, when the relay on the negative side is disconnected, no current flows through the second resistor R2. At this time, the voltage value U1 at the voltage acquisition point is the voltage division value of the first resistor R1 and the third resistor R3, i.e. Where V is the output voltage of power supply component 100; when the negative side relay is closed, the second resistor R2 and the third resistor R3 are connected in parallel. According to the formula for calculating parallel resistance, the equivalent parallel resistance of the second resistor R2 and the third resistor R3 can be obtained. The voltage value U1 at the voltage acquisition point is the voltage division value of the equivalent parallel resistance of the first resistor R1 and the second resistor R2 / / the third resistor R3, that is... Where V is the output voltage of power supply component 100, and Req is the parallel equivalent resistance of the second resistor R2 and the third resistor R3.

[0059] For example, assuming the output voltage of the power supply component 100 is 5V, and the resistance values ​​of the first resistor R1, the second resistor R2, and the third resistor R3 are all equal (i.e., R1 = R2 = R3), when the relay on the negative side is open, the voltage value U1 at the voltage acquisition point can be calculated to be 2.5V. That is, the first preset threshold of this embodiment can be 2.5V. When the relay on the negative side is closed, the voltage value U1 at the voltage acquisition point can be calculated to be 1.67V (the above voltage value does not consider the voltage drop of diode D1). That is, the second preset threshold of this embodiment can be 1.67V.

[0060] Furthermore, in the embodiments of this application, based on different voltage values ​​and the target control state of the relay, it is possible to determine whether the relay is engaged or disengaged as expected, thereby realizing relay state electrode adhesion detection.

[0061] Specifically, when the negative side relay receives a disconnect command, the voltage value of the voltage acquisition point is obtained. If the voltage value of the voltage acquisition point is not in the first preset range (e.g., the voltage value of the voltage acquisition point is less than the first preset threshold), it indicates that the current negative side relay has failed to disconnect normally, and it is determined that the current negative side relay has a sticking fault. At this time, the first detection unit generates a negative side relay sticking fault signal, wherein the first preset range is determined by the first preset threshold.

[0062] Furthermore, the negative-side relay adhesion detection circuit proposed in this application does not use a resistor series. Therefore, the negative-side relay adhesion detection circuit of this application avoids the problem of inaccurate voltage values ​​caused by the parallel effect of the resistor series when detecting multiple relays at the same time.

[0063] Optionally, when the negative side relay receives a closing command, the voltage value of the voltage acquisition point is acquired; if the voltage value of the voltage acquisition point is not within the second preset range (e.g., the voltage value of the voltage acquisition point is greater than the second preset threshold), it indicates that the current negative side relay has failed to close normally, and it is determined that the negative side relay has a closing fault. At this time, the second detection unit generates a negative side relay closing failure signal, wherein the second preset range is determined by the second preset threshold.

[0064] Optionally, in some embodiments, the negative-side relay sticking detection circuit 10 described above further includes an alarm component, which is connected to the first detection unit and the second detection unit respectively. The alarm component is used to provide an alarm reminder when the first detection unit outputs a negative-side relay sticking fault signal or when the second detection unit outputs a negative-side relay closing failure signal.

[0065] Optionally, in some embodiments, the alarm component includes: an acoustic alarm unit connected to the first detection unit and the second detection unit respectively, the acoustic alarm unit being used to provide an acoustic alarm reminder when the first detection unit outputs a negative-side relay sticking fault signal, or when the second detection unit outputs a negative-side relay closing failure signal; and / or an optical alarm unit connected to the first detection unit and the second detection unit respectively, the optical alarm unit being used to provide an optical alarm reminder when the first detection unit outputs a negative-side relay sticking fault signal, or when the second detection unit outputs a negative-side relay closing failure signal.

[0066] The alarm methods described in this application can include sounding an alarm, such as a beeping sound, or issuing a voice announcement, such as indicating that the negative side relay is currently experiencing a sticking fault. Alarms can also be issued via optical alarm units, such as flashing indicator lights within the vehicle. The flashing type can be preset to correspond to the scenario, or the alarm can be displayed on an in-vehicle display screen.

[0067] In the specific execution process, when the first detection unit outputs a negative side relay sticking fault signal, or the second detection unit outputs a negative side relay closing failure signal, an alarm can be triggered by the acoustic alarm unit or the optical alarm unit alone, or both the acoustic alarm unit and the optical alarm unit can be triggered simultaneously. No specific limitation is made here.

[0068] Optionally, in some embodiments, the above-mentioned negative-side relay sticking detection circuit 10 further includes: a communication component (not shown in the figure), which is connected to the first detection unit and the second detection unit respectively. The communication component is used to send the fault status to a preset mobile terminal when the first detection unit outputs a negative-side relay sticking fault signal or when the second detection unit outputs a negative-side relay closing failure signal.

[0069] The preset mobile terminal can be a mobile phone or other handheld communication device with shortwave radio communication function, and no specific limitation is made here.

[0070] Specifically, the communication component can promptly send the fault status to the preset mobile terminal when the first detection unit outputs a negative-side relay sticking fault signal or the second detection unit outputs a negative-side relay closing failure signal. This shortens the time for transmitting fault information, facilitates users to take corresponding measures in a timely manner, improves the efficiency and accuracy of fault handling, and enhances the user experience.

[0071] According to the negative-side relay adhesion detection circuit provided in this application embodiment, upon receiving an adhesion detection request, the control power supply component outputs a preset voltage and controls the switch component to be in a closed state; the voltage value at the voltage acquisition point is obtained, and the current state of the negative-side relay is determined based on the voltage value at the voltage acquisition point. This solves the problems of low accuracy and limitation by the vehicle's electrical network in existing detection methods, improves the reliability and safety of the detection, and the detection circuit has a simple structure and low cost.

[0072] This application provides a battery pack including the negative side relay adhesion detection circuit described in the above embodiment.

[0073] According to the battery pack of this application embodiment, the above-mentioned negative-side relay adhesion detection circuit solves the problems of low accuracy and limitation by the vehicle electrical network in the existing detection methods. By adopting a low-voltage injection method on the other end of the negative-side relay, and using the main negative as the reference voltage point, the influence of residual voltage is shielded, and the state of the negative relay can be detected accurately and effectively without affecting the main positive relay detection circuit, and multiple relays can be detected simultaneously.

[0074] This application also provides a vehicle that includes the battery pack described in the above embodiments.

[0075] According to the vehicle of the present application embodiment, the battery pack described above solves the problems of low accuracy and limitation by the vehicle's electrical network in existing detection methods. By using a low-voltage injection method on the other end of the negative relay, and taking the main negative as the reference voltage point, the influence of residual voltage is shielded, and the state of the negative relay can be detected accurately and effectively without affecting the detection circuit of the main positive relay. This allows for the simultaneous detection of multiple relays.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0078] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0079] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0080] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0081] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A relay adhesion detection circuit on the negative side, characterized in that, include: Power supply components, switching components, and detection components, among which, The power supply component is used to output a preset voltage; The detection component includes a voltage acquisition point, and the first end of the detection component is connected to one end of the negative side relay, the second end of the detection component is connected to the other end of the negative side relay, and the voltage acquisition point is located between the third end of the detection component and the switch component. The detection component is used to obtain the current state of the negative side relay based on the voltage value of the voltage acquisition point when the switch component is in the closed state.

2. The negative-side relay adhesion detection circuit according to claim 1, characterized in that, The detection component includes: A first resistor, one end of which is connected to the output terminal of the power supply assembly, and the other end of which is connected to the switching assembly; A diode, wherein the anode of the diode is connected to the switching assembly, and the cathode of the diode is connected to the switching assembly; The second resistor has one end connected to the cathode of the diode and the switching assembly, and the other end connected to the other end of the negative-side relay. A third resistor, one end of which is connected to the switching assembly, and the other end of which is connected to the connection node between the negative terminal of the battery and one end of the negative terminal relay.

3. The negative-side relay adhesion detection circuit according to claim 2, characterized in that, The detection component further includes: A capacitor, one end of which is connected to one end of the second resistor, and the other end of which is connected to the other end of the second resistor.

4. The negative-side relay adhesion detection circuit according to claim 2, characterized in that, The switching assembly includes: A first switch, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the anode of the diode; The second switch has one end connected to the cathode of the diode and one end of the second resistor, and the other end connected to one end of the third resistor.

5. The negative-side relay adhesion detection circuit according to claim 1, characterized in that, The detection component further includes: The first detection unit is used to generate a negative-side relay sticking fault signal when the negative-side relay receives a disconnection command and the voltage value of the voltage acquisition point is less than a first preset threshold. The second detection unit is used to generate a negative-side relay closing failure signal when the negative-side relay receives a closing command and the voltage value of the voltage acquisition point is greater than a second preset threshold.

6. The negative-side relay adhesion detection circuit according to claim 5, characterized in that, Also includes: An alarm component is connected to both the first detection unit and the second detection unit. The alarm component is used to issue an alarm when the first detection unit outputs a negative-side relay sticking fault signal or when the second detection unit outputs a negative-side relay closing failure signal.

7. The negative-side relay adhesion detection circuit according to claim 6, characterized in that, The alarm component includes: An acoustic alarm unit is connected to the first detection unit and the second detection unit respectively. The acoustic alarm unit is used to provide an acoustic alarm reminder when the first detection unit outputs a fault signal of the negative side relay sticking, or when the second detection unit outputs a signal of the negative side relay failing to close. And / or, an optical alarm unit, which is connected to the first detection unit and the second detection unit respectively, and is used to provide an optical alarm reminder when the first detection unit outputs a fault signal of the negative side relay sticking, or when the second detection unit outputs a signal of the negative side relay failing to close.

8. The negative-side relay adhesion detection circuit according to claim 5, characterized in that, Also includes: A communication component is connected to the first detection unit and the second detection unit respectively. The communication component is used to send a fault status to a preset mobile terminal when the first detection unit outputs a negative-side relay sticking fault signal or the second detection unit outputs a negative-side relay closing failure signal.

9. A battery pack, characterized in that, include: The negative-side relay adhesion detection circuit 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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