Power battery pack, state monitoring circuit thereof and vehicle

Abstract

The utility model discloses a power battery pack, a state monitoring circuit thereof and a vehicle, and the state monitoring circuit comprises a voltage division circuit which is connected with a wire harness and / or a switch in the power battery pack and is configured to output a corresponding monitoring voltage based on the state of the wire harness and / or the switch; and the controller is connected with the voltage division circuit and is configured to determine the working state of the wire harness and / or the switch based on the monitoring voltage. According to the monitoring circuit, the state monitoring function of the wire harness and / or the switch in the power battery pack can be realized without a sensor, and the circuit cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the field of battery monitoring, in particular to a power battery pack and a state monitoring circuit and a vehicle thereof. Background Art

[0002] With the development of new energy technologies, the safety design of lithium-ion power battery systems has become increasingly important, and accordingly, more and more parameters need to be monitored in power battery systems. For example, when the power battery pack is operating normally, the system needs to monitor the current of the power battery pack and provide thermal runaway warnings at the same time. In this regard, the relevant technologies usually implement parameter monitoring by adding corresponding sensors, for example, the current monitoring of the power battery system is achieved through the Hall current sensor related to the shunt, and the thermal runaway alarm of the power battery pack is achieved through voltage sensors, pressure sensors, temperature sensors, etc. However, the relevant technology requires the use of multiple sensors for parameter monitoring, which leads to high costs for the power battery system. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the utility model is to propose a state monitoring circuit for a power battery pack, by arranging a voltage divider circuit and a controller in the monitoring circuit, the voltage divider circuit can output a corresponding monitoring voltage based on the state of the wiring harness and / or switch in the power battery pack, and then the controller can determine the working state of the wiring harness and / or switch according to the monitoring voltage, so that the state monitoring function of the wiring harness and switch in the power battery pack can be realized without a sensor, effectively reducing the cost of the monitoring circuit.

[0004] The second objective of the present invention is to provide a power battery pack.

[0005] The third objective of the present invention is to provide a vehicle.

[0006] To achieve the above-mentioned objectives, an embodiment of the first aspect of the utility model proposes a state monitoring circuit for a power battery pack, the state monitoring circuit comprising: a voltage divider circuit, the voltage divider circuit is connected to the wiring harness and / or switch in the power battery pack, and is configured to output a corresponding monitoring voltage based on the state of the wiring harness and / or switch; a controller, the controller is connected to the voltage divider circuit, and is configured to determine the working state of the wiring harness and / or switch based on the monitoring voltage.

[0007] According to the status monitoring circuit of the embodiment of the utility model, by arranging a voltage divider circuit and a controller in the monitoring circuit, the voltage divider circuit can output a corresponding monitoring voltage based on the status of the wiring harness and / or switch in the power battery pack, and then the controller can determine the working status of the wiring harness and / or switch according to the monitoring voltage, thereby being able to implement the status monitoring function of the wiring harness and switch in the power battery pack without the need for sensors, effectively reducing the cost of the monitoring circuit.

[0008] According to one embodiment of the utility model, the voltage divider circuit includes: a first resistor, a second resistor and / or a third resistor, wherein one end of the first resistor is connected to a preset power supply, and the other end of the first resistor is connected to a controller; one end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is connected to one end of a wiring harness, and the other end of the wiring harness is grounded; one end of the third resistor is connected to the other end of the first resistor, and the other end of the third resistor is connected to one end of a switch, and the other end of the switch is grounded.

[0009] According to an embodiment of the present utility model, the state monitoring circuit further includes: a filter circuit, which is disposed between the voltage divider circuit and the controller and is configured to perform filtering processing on the monitoring voltage.

[0010] According to one embodiment of the utility model, the filtering circuit includes: a first capacitor, one end of the first capacitor is connected to the voltage divider circuit, and the other end of the first capacitor is grounded; a fourth resistor, one end of the fourth resistor is connected to one end of the first capacitor and the voltage divider circuit respectively, and the other end of the fourth resistor is connected to the controller; a second capacitor, one end of the second capacitor is connected to the other end of the fourth resistor and the controller respectively, and the other end of the second capacitor is grounded.

[0011] According to an embodiment of the utility model, the wiring harness is a wiring harness of a shunt in a power battery pack, and the switch is an explosion-proof switch of an explosion-proof valve in the power battery pack.

[0012] According to an embodiment of the utility model, the state monitoring circuit further includes: an alarm, the alarm is connected to the controller, and the controller is further configured to control the alarm to send out an alarm reminder message when the working state of the wiring harness and / or the switch is abnormal.

[0013] According to an embodiment of the present invention, the IO port of the controller is connected to the voltage divider circuit.

[0014] According to an embodiment of the present utility model, the power battery pack further includes a battery management system, and the battery management system includes a controller.

[0015] In order to achieve the above-mentioned purpose, a second aspect of the present invention provides a power battery pack, including the above-mentioned state monitoring circuit.

[0016] According to the power battery pack of the embodiment of the utility model, the aforementioned state monitoring circuit can realize the state monitoring function of the wiring harness and / or switch in the power battery pack without sensors, thereby reducing the cost of the power battery pack.

[0017] In order to achieve the above-mentioned purpose, a third aspect of the present utility model provides a vehicle, including the aforementioned state monitoring circuit, or the aforementioned power battery system.

[0018] According to the vehicle of the embodiment of the utility model, the state monitoring circuit or the power battery pack mentioned above can realize the state monitoring function of the power battery pack in the vehicle without the need for sensors, thereby reducing the cost of the vehicle.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1a to 1c It is a structural schematic diagram of a state monitoring circuit according to some embodiments of the utility model;

[0021] Figure 2a to 2c is a circuit diagram of a voltage divider circuit according to some embodiments of the utility model;

[0022] Figure 3 is a circuit diagram of a state monitoring circuit according to an embodiment of the utility model;

[0023] Figure 4 It is a schematic structural diagram of a power battery pack according to an embodiment of the utility model;

[0024] Figure 5 is a schematic structural diagram of a power battery pack according to another embodiment of the utility model;

[0025] Figure 6a-6b It is a schematic diagram of the structure of a vehicle according to some embodiments of the utility model. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The power battery pack, state monitoring circuit thereof, and vehicle provided in the embodiments of the present utility model are described below with reference to the accompanying drawings.

[0028] Figure 1a to 1c1 is a schematic structural diagram of a state monitoring circuit of a power battery pack according to some embodiments of the present invention. Referring to FIG. 1 , the state monitoring circuit 100 includes: a voltage divider circuit 110 and a controller 120 .

[0029] Among them, the voltage divider circuit 110 is connected to the wiring harness 210 and / or the switch 220 in the power battery pack 200, and is configured to output a corresponding monitoring voltage based on the state of the wiring harness 210 and / or the switch 220; the controller 120 is connected to the voltage divider circuit 110, and is configured to determine the working state of the wiring harness 210 and / or the switch 220 based on the monitoring voltage.

[0030] Specifically, in the power battery pack 200, the connection status of the wiring harness 210 and the on / off status of the switch 229 need to be monitored to avoid problems such as malfunction of the switch, overvoltage or fuse in the wiring harness 210. In this regard, the relevant technology usually requires the provision of corresponding sensors or sampling circuits to realize the monitoring function of the wiring harness 210 and the switch 220. In the embodiment of the utility model, reference Figure 1a As shown, the voltage divider circuit 110 can be connected to the wiring harness 210 and the switch 220 in the power battery pack 200, and output the corresponding monitoring voltage according to the state of the wiring harness 210 and the switch 220. The controller 120 can determine the working state of the wiring harness 210 and the switch 220 according to the monitoring voltage, thereby realizing the state monitoring function of the power battery pack 200. For example, when the switch 220 switches from the on state to the off state, the equivalent resistance of the switch 220 will change from zero to a maximum value, causing the monitoring voltage output by the voltage divider circuit 110 to fluctuate violently. Therefore, the controller 120 can monitor the on state of the switch 220 according to the monitoring voltage. At the same time, compared with the method of using sensors, the state monitoring circuit 100 of the embodiment of the utility model only needs to use a simple voltage divider circuit 110 to realize state monitoring, and the cost is relatively lower.

[0031] It should be noted that the reference Figure 1b or Figure 1b As shown, the state monitoring circuit 100 can only monitor the state of the wiring harness 210 or the switch 220. The specific principle is the same as Figure 1a The state monitoring circuit 100 is similar to that in the embodiment of the present invention, and will not be described in detail here.

[0032] In the above embodiment, by setting a voltage divider circuit and a controller in the monitoring circuit, the voltage divider circuit can output a corresponding monitoring voltage based on the state of the wiring harness and / or switch in the power battery pack, and then the controller can determine the working state of the wiring harness and / or switch according to the monitoring voltage, thereby being able to implement the state monitoring function of the wiring harness and switch in the power battery pack without the need for sensors, effectively reducing the cost of the monitoring circuit.

[0033] In some embodiments, reference Figure 2a to Figure 2cAs shown, the voltage divider circuit 110 includes: a first resistor R1, a second resistor R2 and / or a third resistor R3, wherein one end of the first resistor R1 is connected to a preset power supply VDD, and the other end of the first resistor R1 is connected to the controller 120; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is connected to one end of the wiring harness 210, and the other end of the wiring harness 210 is grounded GND; one end of the third resistor R3 is connected to the other end of the first resistor R1, and the other end of the third resistor R3 is connected to one end of the switch 220, and the other end of the switch 220 is grounded GND.

[0034] Specifically, the voltage divider circuit 110 can monitor the status of the harness 210 and the switch 220 simultaneously through the first to third resistors R1 to R3. Figure 2a As shown, the working states of the wiring harness 210 and the switch 220 can be divided into an on state and an off state, wherein the on state of the wiring harness 210 corresponds to a normal connection state, and the off state of the wiring harness 210 corresponds to a disconnected state. When the wiring harness 210 is on and the switch 220 is off, the preset power supply VDD can be connected to the ground GND through the first resistor R1 and the second resistor R2, and the controller 120 can monitor a first monitoring voltage, which can be determined based on the voltage of the preset power supply VDD and the resistance values ​​of the first resistor R1 and the second resistor R2; when the wiring harness 210 is off and the switch 220 is on, the preset power supply VDD can be connected to the ground GND through the first resistor R1 and the third resistor R3, and the controller 120 can monitor a second monitoring voltage, which can be determined based on the voltage of the preset power supply VDD, the first resistor R1 and the third resistor R3. The resistance value of the third resistor R3 is determined; when the wiring harness 210 and the switch 220 are both disconnected, the preset power supply VDD can be connected to the controller 120 through the first resistor R1, and the controller 120 can monitor the third monitoring voltage, which can be determined according to the voltage of the preset power supply VDD; when the wiring harness 210 and the switch 220 are both turned on, the second resistor R2 and the third resistor R3 are connected in parallel to the first resistor R1, and the controller 120 can monitor the fourth monitoring voltage, which can be determined according to the voltage of the preset power supply VDD and the resistance values ​​of the first to third resistors R1 to R3. It can be seen that the voltage divider circuit 110 can output monitoring voltages of different voltage values ​​according to the different conduction states of the wiring harness 210 and the switch 220. Therefore, the controller 120 can determine the working state of the wiring harness 210 and the switch 220 according to the monitoring voltage.

[0035] Alternatively, refer to Figure 2b to Figure 2c As shown, the voltage divider circuit 110 can output monitoring voltages of different voltage values ​​according to the working state of the wiring harness 210 or the switch 220 to realize the monitoring function of the wiring harness 210 or the switch 220. For example, referring to Figure 2bAs shown, the voltage divider circuit 110 includes a first resistor R1 and a second resistor R2. At this time, when the wiring harness 210 is turned on, the preset power supply VDD can be connected to the ground GND through the first resistor R1 and the second resistor R2, and the controller 120 can monitor the first monitoring voltage; when the wiring harness 210 is turned off, the preset power supply VDD can be connected to the controller 120 through the first resistor R1, and the controller 120 can monitor the third monitoring voltage. In this way, the controller 120 can realize the function of determining the working state of the wiring harness 210 according to the monitoring voltage.

[0036] It should be noted that the reference Figure 2c As shown, when the voltage divider circuit 110 includes a first resistor R1 and a third resistor R3, the working principle of the voltage divider circuit 110 is the same as Figure 2b The voltage divider circuit 110 including the first resistor R1 and the second resistor R2 is similar and will not be described in detail herein.

[0037] In some embodiments, reference Figure 3 As shown, the state monitoring circuit 100 further includes: a filter circuit 130 , which is disposed between the voltage divider circuit 110 and the controller 120 and is configured to perform filtering processing on the monitoring voltage.

[0038] Furthermore, the filter circuit includes: a first capacitor C1, a fourth resistor R4, and a second capacitor C2. One end of the first capacitor C1 is connected to the voltage divider circuit 110, and the other end of the first capacitor C1 is grounded GND; one end of the fourth resistor R4 is connected to one end of the first capacitor C1 and the voltage divider circuit 110, and the other end of the fourth resistor R4 is connected to the controller 120 respectively; one end of the second capacitor C2 is connected to the other end of the fourth resistor R4 and the controller 120 respectively, and the other end of the second capacitor C2 is grounded GND.

[0039] Specifically, the first capacitor C1 and the second capacitor C2 both have filtering and voltage stabilization functions, so as to realize the filtering function of the filter circuit 130 on the monitoring voltage, so as to improve the accuracy of the monitoring voltage obtained by the controller 120. The fourth resistor R4 is mainly used for current limiting to prevent the controller 120 from having excessive current in the circuit when obtaining the monitoring voltage, thereby improving the safety of the monitoring circuit.

[0040] In some embodiments, the wiring harness 210 is a wiring harness of a shunt in the power battery pack 200 , and the switch 220 is an explosion-proof switch of an explosion-proof valve in the power battery pack 200 .

[0041] Specifically, the wiring harness of the shunt is used to collect the working current or working voltage of the power battery pack 200; the explosion-proof switch of the explosion-proof valve is usually a normally closed switch, which can be opened when the power battery pack 200 has a thermal runaway condition to achieve pressure release to protect the safety of the power battery pack 200. When the shunt is working normally, the resistance value is extremely small and can be regarded as a conductive state, and when the shunt has a disconnection fault, the shunt can be regarded as a disconnected state; similarly, when the power battery system 200 does not have a thermal runaway problem, the explosion-proof valve is not opened, the explosion-proof switch is closed, and can be regarded as a conductive state, and when the power battery system 200 has a thermal runaway problem, the explosion-proof valve is opened, the explosion-proof switch is opened, and can be regarded as a disconnected state. Therefore, when the wiring harness 210 is the wiring harness of the shunt in the power battery pack 200, and the switch 220 is the explosion-proof switch of the explosion-proof valve in the power battery pack 200, the monitoring circuit 100 can simultaneously realize the disconnection monitoring function of the shunt and the thermal runaway monitoring function of the power battery pack 200. The specific method is the same as above Figure 2a The principle of the voltage divider circuit 110 is similar and will not be described in detail here. In the related art, these functions require corresponding current sensors and pressure sensors to be realized, while the monitoring circuit in the embodiment of the utility model can be realized by a voltage divider circuit composed of three resistors, thereby effectively reducing the cost of the monitoring circuit.

[0042] It should be noted that the resistance values ​​of the first resistor R1, the second resistor R2 and the third resistor R3 can be resistors of different resistance values ​​so that the controller 120 can distinguish the first to fourth monitoring voltages. For example, the resistance value of the first resistor R1 can be 5.1KΩ, the resistance value of the second resistor R2 can be 6.8KΩ, the resistance value of the third resistor R3 can be 4.7KΩ, and the preset power supply VDD voltage can be 5V. At this time, according to the voltage division principle, it can be calculated that when the wiring harness 210 is turned on and the switch 220 is turned off, the voltage value of the first monitoring voltage monitored by the controller 120 can be 2.85V; when the wiring harness 210 is turned off and the switch 220 is turned on, the voltage value of the second monitoring voltage monitored by the controller 120 can be 2.4V; when the wiring harness 210 and the switch 220 are both turned off, the voltage value of the third monitoring voltage monitored by the controller 120 can be 5V; when the wiring harness 210 and the switch 220 are both turned on, the second resistor R2 and the third resistor R3 are connected in parallel to the first resistor R1. At this time, the voltage value of the fourth monitoring voltage monitored by the controller 120 can be 1.76V. It can be seen that the controller 120 can determine the working status of the wiring harness 210 and the switch 220 according to the voltage value of the monitoring voltage, thereby realizing multiple monitoring functions for the power battery pack 200.

[0043] In some embodiments, reference Figure 3As shown, the state monitoring circuit 100 further includes: an alarm 140 connected to the controller 120, and the controller 120 is further configured to control the alarm 140 to issue an alarm reminder message when the working state of the wiring harness 210 and / or the switch 220 is abnormal.

[0044] Specifically, when the controller 120 finds that the working state of the wiring harness 210 and / or the switch 220 is abnormal, it can control the alarm 140 to issue an alarm reminder message so that the user can find the abnormal state of the power battery pack 200, thereby improving the convenience of the state monitoring circuit.

[0045] Optionally, the controller 120 can be connected to the voltage divider circuit 110 through a standard IO port to obtain monitoring voltages of different voltage values ​​output by the voltage divider circuit 110, and then determine the working state of the power battery pack 200. The connection method of the standard IO port can be beneficial to the integration and data transmission of the controller 120.

[0046] Optional, reference Figure 4 As shown, the power battery pack 200 further includes a battery management system 230 , and the battery management system 230 includes a controller 120 .

[0047] Specifically, the functions of the controller 120 in the state monitoring circuit 100 can be integrated into the battery management system 230 in the power battery pack 200 , thereby realizing the reuse of the controller 120 and reducing the cost of the state monitoring circuit 100 .

[0048] In summary, according to the state monitoring circuit of the embodiment of the utility model, by arranging a voltage divider circuit and a controller in the monitoring circuit, the voltage divider circuit can output a corresponding monitoring voltage based on the on-off state of the wiring harness and / or the switch of the power battery pack, and then the controller can determine the working state of the wiring harness and / or the switch according to the monitoring voltage, wherein the wiring harness can be a wiring harness of a shunt, and the switch can be an explosion-proof switch of an explosion-proof valve, thereby realizing abnormal state monitoring functions such as the shunt disconnection monitoring function and the thermal runaway monitoring function of the power battery pack without sensors; at the same time, through the alarm in the monitoring circuit, when the working state of the wiring harness and / or the switch is an abnormal state, the alarm can be controlled to send an alarm reminder message, so that the user can discover the abnormal state of the power battery pack, thereby reducing the cost of the monitoring circuit and improving the convenience of the monitoring circuit.

[0049] Corresponding to the above embodiment, the utility model embodiment also provides a power battery pack, referring to Figure 5 As shown, the power battery pack 1000 includes the aforementioned state monitoring circuit 100 .

[0050] The power battery pack according to the embodiment of the utility model can realize abnormal state monitoring functions such as shunt disconnection monitoring function and thermal runaway monitoring function of the power battery pack without sensors through the aforementioned state monitoring circuit. At the same time, it can also issue an alarm reminder message when the power battery pack is in an abnormal state, thereby reducing the cost of the power battery pack and improving the convenience of the monitoring function.

[0051] Corresponding to the above embodiment, the utility model embodiment also provides a vehicle, referring to Figure 6a to Figure 6b As shown, the vehicle 10000 includes the aforementioned state monitoring circuit 100 , or the aforementioned power battery pack 1000 .

[0052] According to the vehicle of the embodiment of the utility model, through the aforementioned state monitoring circuit or the aforementioned power battery pack, it is possible to realize abnormal state monitoring functions such as the shunt disconnection monitoring function and the thermal runaway monitoring function of the power battery pack without sensors, and at the same time, it is possible to issue an alarm reminder message when an abnormal state occurs in the power battery pack, thereby reducing the cost of the vehicle and improving the convenience of the power battery pack monitoring function.

[0053] It should be understood that the various parts of the utility model can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A state monitoring circuit for a power battery pack, characterized in that: The state monitoring circuit comprises: A voltage divider circuit, the voltage divider circuit is connected to a wiring harness and / or a switch in the power battery pack and is configured to output a corresponding monitoring voltage based on a state of the wiring harness and / or the switch; A controller is connected to the voltage dividing circuit and is configured to determine the operating state of the wiring harness and / or the switch based on the monitoring voltage.

2. The state monitoring circuit according to claim 1, characterized in that: The voltage divider circuit includes: a first resistor, a second resistor and / or a third resistor, wherein: One end of the first resistor is connected to a preset power supply, and the other end of the first resistor is connected to the controller; One end of the second resistor is connected to the other end of the first resistor, the other end of the second resistor is connected to one end of the wiring harness, and the other end of the wiring harness is grounded; One end of the third resistor is connected to the other end of the first resistor, the other end of the third resistor is connected to one end of the switch, and the other end of the switch is grounded.

3. The state monitoring circuit according to claim 2, characterized in that: The state monitoring circuit further includes: a filter circuit, which is disposed between the voltage divider circuit and the controller and is configured to perform filtering processing on the monitoring voltage.

4. The state monitoring circuit according to claim 3, characterized in that: The filtering circuit comprises: A first capacitor, one end of the first capacitor is connected to the voltage divider circuit, and the other end of the first capacitor is grounded; a fourth resistor, one end of the fourth resistor being connected to one end of the first capacitor and the voltage divider circuit respectively, and the other end of the fourth resistor being connected to the controller; A second capacitor, one end of the second capacitor is connected to the other end of the fourth resistor and the controller respectively, and the other end of the second capacitor is grounded.

5. The state monitoring circuit according to any one of claims 1 to 4, characterized in that: The wiring harness is a wiring harness of a shunt in the power battery pack, and the switch is an explosion-proof switch of an explosion-proof valve in the power battery pack.

6. The state monitoring circuit according to any one of claims 1 to 4, characterized in that: The state monitoring circuit further includes: an alarm, which is connected to the controller. The controller is further configured to control the alarm to issue an alarm reminder message when the working state of the wiring harness and / or the switch is abnormal.

7. The state monitoring circuit according to claim 1, characterized in that: The IO port of the controller is connected to the voltage divider circuit.

8. The state monitoring circuit according to claim 1, characterized in that: The power battery pack further includes a battery management system, and the battery management system includes the controller.

9. A power battery pack, characterized in that: The method comprises a state monitoring circuit according to any one of claims 1 to 8.

10. A vehicle, characterized in that: It comprises a status monitoring circuit according to any one of claims 1 to 8, or a power battery pack according to claim 9.

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