Battery interface identification circuit and battery management system

Abstract

The utility model provides a battery interface identification circuit. The battery interface identification circuit comprises a reference voltage module and a voltage conversion module. The reference voltage module is composed of a first electronic switching tube, a first divider resistor, a first current-limiting resistor and a first feedback resistor, and is used for generating a reference voltage when the battery management system supplies power. And the voltage conversion module comprises a second electronic switching tube, a signal current-limiting resistor, a control resistor and a second divider resistor, and is used for converting the reference voltage into a signal which can be identified by the microcontroller. The circuit almost has no power consumption when the battery management system is shut down or not connected, so that the use efficiency of the battery is improved. In addition, the introduction of the negative feedback resistor enhances the stability and accuracy of the circuit in a low-temperature environment. Meanwhile, due to the mutual independence of the reference voltage module and the voltage conversion module, the expandability of the circuit is enhanced, so that the battery interface identification circuit can meet the identification requirements of different numbers of interfaces.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of battery management, and in particular to a battery interface identification circuit and a battery management system. BACKGROUND

[0002] In a battery management system, the interface identification circuit is responsible for monitoring the connection state of the external connector and its effective connection with other key voltage points, so as to ensure the safe and efficient operation of the battery system. In practical applications, the traditional interface identification circuit usually adopts a method of resistance voltage division combined with transistor base voltage identification, which detects the voltage change of the input pin and uses the switching state of the transistor to control the level of the microcontroller identification end, so as to judge the external connection state.

[0003] However, the traditional circuit of the prior art may still produce unnecessary power consumption after the BMS is turned off due to the existence of external connection, which not only wastes energy but also may have a negative impact on the battery life. Secondly, with the continuous expansion of the application field of the battery, the battery system needs to face a larger working voltage range. Finally, in the application scenario of multi-interface circuit, the power consumption problem of the traditional circuit is particularly prominent. Since each interface needs an independent identification circuit, the power consumption will increase linearly with the increase in the number of interfaces, thereby increasing the energy consumption of the battery. UTILITY MODEL CONTENT

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a high-efficiency and energy-saving battery interface identification circuit and a battery management system.

[0005] The purpose of the present disclosure is achieved by the following technical solutions:

[0006] A battery interface identification circuit, comprising a reference voltage module and a voltage conversion module, the reference voltage module comprising a first electronic switch tube, a first voltage dividing resistor and a first current limiting resistor, the first end of the first current limiting resistor being used for connecting with the power supply end of the battery management system, the second end of the first current limiting resistor being connected with the control end of the first electronic switch tube, the first end of the first voltage dividing resistor being used for connecting with the positive electrode of the battery, the second end of the first voltage dividing resistor being connected with the first end of the first electronic switch tube, and the second end of the first electronic switch tube being grounded.

[0007] The voltage conversion module comprises a second electronic switch tube, a signal current-limiting resistor, a control resistor and a second voltage dividing resistor, a first end of the control resistor is connected with a second end of the first voltage dividing resistor, a second end of the control resistor is connected with a control end of the second electronic switch tube, a first end of the second voltage dividing resistor is connected with a second end of the second electronic switch tube, a second end of the second voltage dividing resistor is grounded, a first end of the signal current-limiting resistor is connected with the first end of the second voltage dividing resistor, and a second end of the signal current-limiting resistor is used for being connected with a level signal receiving end of a microcontroller.

[0008] In one of the embodiments, the battery interface identification circuit further comprises a level inversion module, the level inversion module comprises a third electronic switch tube and a third voltage dividing resistor, a first end of the third voltage dividing resistor is used for being connected with a power supply end of a battery management system, a second end of the third voltage dividing resistor is connected with a first end of the third electronic switch tube, a control end of the third electronic switch tube is connected with a second end of the signal current-limiting resistor, a second end of the third electronic switch tube is grounded, and the first end of the third electronic switch tube is further connected with the level signal receiving end of the microcontroller.

[0009] In one of the embodiments, the reference voltage module further comprises a fourth voltage dividing resistor, a first end of the fourth voltage dividing resistor is connected with the second end of the first voltage dividing resistor, and a second end of the fourth voltage dividing resistor is connected with the first end of the first electronic switch tube.

[0010] In one of the embodiments, the reference voltage module further comprises a first current conducting diode, a positive electrode of the first current conducting diode is used for being connected with a positive electrode of a battery, and a negative electrode of the first current conducting diode is connected with the first end of the first voltage dividing resistor.

[0011] In one of the embodiments, the voltage conversion module further comprises a bias resistor, a first end of the bias resistor is connected with the control end of the second electronic switch tube, and a second end of the bias resistor is connected with the first end of the second electronic switch tube.

[0012] In one of the embodiments, the voltage conversion module further comprises a second current conducting diode, a positive electrode of the second current conducting diode is used for being connected with a connection identification signal end of a microcontroller, and a negative electrode of the second current conducting diode is connected with the first end of the second voltage dividing resistor.

[0013] In one of the embodiments, the voltage conversion module further comprises a second current-limiting resistor, a first end of the second current-limiting resistor is used for being connected with the connection identification signal end of the microcontroller, and a second end of the second current-limiting resistor is connected with the first end of the second electronic switch tube.

[0014] In one of the embodiments, the voltage conversion module further comprises a third current-limiting resistor, a first end of the third current-limiting resistor is connected with the second end of the second electronic switch tube, and a second end of the third current-limiting resistor is connected with the first end of the second voltage dividing resistor.

[0015] In one of the embodiments, the reference voltage module further comprises a first feedback resistor, a first end of the first feedback resistor is connected with the second end of the first electronic switch tube, and a second end of the first feedback resistor is grounded.

[0016] A battery interface identification circuit as claimed in any one of the preceding embodiments.

[0017] Compared with the prior art, the present disclosure has at least the following advantages:

[0018] 1. The battery interface identification circuit as described above, in the battery management system shutdown or unconnected state, since the first electronic switch tube is in the off state, so that the reference voltage module does not generate a reference voltage, so that the reference voltage module and the voltage conversion module have no energy loss, thereby effectively solving the problem of power consumption of the traditional circuit after shutdown, and further improving the energy use efficiency of the battery interface identification circuit. In addition, since the reference voltage module and the voltage conversion module are relatively independent, and multiple voltage conversion modules can share the same reference voltage module, so that the battery interface identification circuit can meet the interface identification requirements of different quantities, thereby improving the expansibility of the battery interface identification circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 A circuit diagram of the battery interface identification circuit of an embodiment;

[0021] Figure 2 Another circuit diagram of the battery interface identification circuit of an embodiment. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the related drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present disclosure more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0026] like Figure 1 and Figure 2 As shown, a battery interface identification circuit 10 according to an embodiment of the present disclosure includes a reference voltage module 100 and a voltage conversion module 200. The reference voltage module 100 includes a first electronic switch Q1, a first voltage divider resistor R1 and a first current limiting resistor R2. The first end of the first current limiting resistor R2 is connected to the power supply terminal VCC of the battery management system, and the second end of the first current limiting resistor R2 is connected to the control terminal of the first electronic switch Q1. The first end of the first voltage divider resistor R1 is connected to the positive terminal B+ of the battery, and the second end of the first voltage divider resistor R1 is connected to the first end of the first electronic switch Q1. The second end of the first electronic switch Q1 is grounded.

[0027] The voltage conversion module 200 includes a second electronic switch Q2, a signal current-limiting resistor R10, a control resistor R5, and a second voltage divider resistor R9. The first end of the control resistor R5 is connected to the second end of the first voltage divider resistor R1, and the second end of the control resistor R5 is connected to the control terminal of the second electronic switch Q2. The first end of the second voltage divider resistor R9 is connected to the second end of the second electronic switch Q2, and the second end of the second voltage divider resistor R9 is grounded. The first end of the signal current-limiting resistor R10 is connected to the first end of the second voltage divider resistor R9, and the second end of the signal current-limiting resistor R10 is used to connect to the microcontroller's level signal receiving terminal MCU_IO.

[0028] In the embodiment, when the battery management system power supply end VCC is powered on, the current flows to the control end of the first electronic switch tube Q1 through the first current-limiting resistor R2, so that the control end voltage of the first electronic switch tube Q1 is greater than its conduction threshold voltage, thereby making the first electronic switch tube Q1 in the on state. At the same time, since the first voltage dividing resistor R1 is connected with the positive electrode B+ of the battery, the voltage provided by the positive electrode B+ of the battery flows through the first voltage dividing resistor R1 and then through the first electronic switch tube Q1 to the ground end, thereby forming a stable voltage output in the loop formed by the first voltage dividing resistor R1, the first electronic switch tube Q1, the first feedback resistor R3 and the ground end. When the connection identification signal end Short_H of the microcontroller is effectively connected with the positive electrode B+ of the battery, the connection identification signal end Short_H of the microcontroller refers to the voltage of the positive electrode B+ of the battery, and the voltage is transmitted to the first end of the second electronic switch tube Q2 through the second voltage dividing resistor R7. At the same time, the voltage output by the positive electrode B+ of the battery flows through the first voltage dividing resistor R1 after being divided, and then is transmitted to the control end of the second electronic switch tube Q2 through the control resistor R5, so that the voltage at the first end of the second electronic switch tube Q2 is greater than the voltage at the control end of the second electronic switch tube Q2, thereby making the second electronic switch tube Q2 be turned on, so that the current is output from the second end of the second electronic switch tube Q2 to the second voltage dividing resistor R9. Then, the level signal is transmitted to the level signal receiving end MCU_IO of the microcontroller through the current-limiting resistor R10 connected with the second voltage dividing resistor R9, thereby making the microcontroller be able to judge whether the connection identification signal end Short_H of the microcontroller is effectively connected with the positive electrode B+ of the battery according to the received level signal.

[0029] Further, when the battery management system is turned off or the connection identification signal end Short_H of the microcontroller is not effectively connected with the positive electrode B+ of the battery, the battery management system power supply end VCC outputs a low-level signal, so that the control end voltage of the first electronic switch tube Q1 is lower than its conduction threshold voltage, thereby making the first electronic switch tube Q1 in the off state, so that the reference voltage cannot be generated, thereby making the voltage conversion module 200 unable to work, and the circuit has almost no power consumption.

[0030] Further, when a plurality of external pins need to be identified, since the reference voltage module 100 outputs a stable voltage, only one voltage conversion module 200 needs to be added, without the need to configure a reference voltage module 100 for each voltage conversion module 200, thereby saving circuit elements and wiring space, and thereby significantly reducing the overall power consumption of the battery interface identification circuit 10. The specific working principle is shown in the following Figure 2 .

[0031] The battery interface identification circuit 10 described above, in the battery management system shutdown or unconnected state, due to the first electronic switch tube is in the off state, so that the reference voltage module 100 does not produce reference voltage, so that the reference voltage module 100 and voltage conversion module 200 have no energy loss, thereby effectively solve the problem of traditional circuit after shutdown still have power consumption, and then improve the energy use efficiency of battery interface identification circuit 10. In addition, due to the reference voltage module 100 and voltage conversion module 200 are relatively independent, and multiple voltage conversion module 200 can share the same reference voltage module 100, so that the battery interface identification circuit 10 can meet the different number of interface identification requirements, thereby improving the scalability of the battery interface identification circuit 10.

[0032] In another embodiment, the first electronic switch tube Q1 is an NPN type transistor, the second electronic switch tube Q2 is a PNP type transistor, the first end of the first electronic switch tube Q1 is the collector of the NPN type transistor, the second end of the first electronic switch tube Q1 is the emitter of the NPN type transistor, and the control end of the first electronic switch tube Q1 is the base of the NPN type transistor. The first end of the second electronic switch tube Q2 is the emitter of the PNP type transistor, the second end of the second electronic switch tube Q2 is the collector of the PNP type transistor, and the control end of the second electronic switch tube Q2 is the base of the PNP type transistor.

[0033] As Figure 1As shown, in one embodiment, the battery interface identification circuit 10 further comprises a level inversion module 300, which comprises a third electronic switch tube Q3 and a third voltage dividing resistor R11. The first end of the third voltage dividing resistor R11 is connected with the battery management system power supply end VCC, the second end of the third voltage dividing resistor R11 is connected with the first end of the third electronic switch tube Q3, the control end of the third electronic switch tube Q3 is connected with the second end of the signal current limiting resistor R10, the second end of the third electronic switch tube Q3 is grounded, and the first end of the third electronic switch tube Q3 is also connected with the level signal receiving end MCU IO of the microcontroller. In this embodiment, since the control end of the third electronic switch tube Q3 is connected with the second end of the signal current limiting resistor R10, when the voltage output by the signal current limiting resistor R10 is transmitted to the control end of the third electronic switch tube Q3, the voltage at the control end of the third electronic switch tube Q3 is greater than its conduction threshold voltage, so that the third electronic switch tube Q3 is turned on, so that the level signal receiving end MCU IO of the microcontroller is connected with the ground end through the third electronic switch tube Q3, and the level signal receiving end MCU IO of the microcontroller is pulled to a low level, so that when the connection identification signal end Short_H of the microcontroller is effectively connected with the positive electrode B+ of the battery, the level signal receiving end MCU IO of the microcontroller receives a low level signal, thereby ensuring that the converted voltage does not exceed the maximum voltage of the level signal receiving end MCU IO of the microcontroller, so as to protect the microcontroller from damage.

[0034] As shown, Figure 1 In one embodiment, the reference voltage module 100 further comprises a fourth voltage dividing resistor R4, the first end of the fourth voltage dividing resistor R4 is connected with the second end of the first voltage dividing resistor R1, and the second end of the fourth voltage dividing resistor R4 is connected with the first end of the first electronic switch tube Q1. In this embodiment, after the voltage provided by the positive electrode B+ of the battery passes through the first voltage dividing resistor R1, since the fourth voltage dividing resistor R4 is connected in series with the first voltage dividing resistor R1, the fourth voltage dividing resistor R4 and the first voltage dividing resistor R1 share the voltage of the positive electrode B+ of the battery together, so as to more accurately adjust the voltage value flowing through the first electronic switch tube Q1. In addition, the fourth voltage dividing resistor R4 not only improves the stability of the reference voltage, but also enhances the adaptability of the battery interface identification circuit 10 to the fluctuation of the battery voltage. When the battery voltage fluctuates, due to the voltage dividing effect of the fourth voltage dividing resistor R4, the change range of the reference voltage can be reduced, thereby ensuring the stability and reliability of the battery interface identification circuit 10.

[0035] As shown, Figure 1As shown, in one of the embodiments, the reference voltage module 100 further comprises a first conduction diode D1, the positive pole of the first conduction diode D1 is used for connecting with the battery positive pole B+, and the negative pole of the first conduction diode D1 is connected with the first end of the first voltage dividing resistor R1. In this embodiment, since the first conduction diode D1 has the characteristic of one-way conduction of current, and its positive pole is connected with the battery positive pole B+, and the negative pole is connected with the first end of the first voltage dividing resistor R1, the current can flow from the battery positive pole B+ to the first voltage dividing resistor R1 in one direction, so as to prevent the current from flowing reversely into the battery positive pole B+, thereby ensuring the safety and stability of the battery interface identification circuit 10.

[0036] As shown, Figure 1 As shown, in one of the embodiments, the voltage conversion module 200 further comprises a bias resistor R6, the first end of the bias resistor R6 is connected with the control end of the second electronic switch tube Q2, and the second end of the bias resistor R6 is connected with the first end of the second electronic switch tube Q2. In this embodiment, when the battery management system power supply end VCC is powered on and the reference voltage module 100 works normally, the first electronic switch tube Q1 is turned on to form a stable reference voltage, and the stable reference voltage is transmitted to the control end of the second electronic switch tube Q2 through the control resistor R5. When the voltage transmitted by the control resistor R5 makes the second electronic switch tube Q2 start to conduct, since the bias resistor R6 is connected in parallel between the control end and the first end of the second electronic switch tube Q2, an additional current path is provided for the second electronic switch tube Q2, so that the bias resistor R6 can further ensure that a stable voltage difference is maintained between the control end and the first end of the second electronic switch tube Q2, so that the second electronic switch tube Q2 continues to conduct.

[0037] As shown, Figure 1 As shown, in one of the embodiments, the voltage conversion module 200 further comprises a second conduction diode D2, the positive pole of the second conduction diode D2 is used for connecting with the connection identification signal end Short_H of the microcontroller, and the negative pole of the second conduction diode D2 is connected with the first end of the second voltage dividing resistor R7. In this embodiment, since the second conduction diode D2 has the characteristic of one-way conduction of current, and its positive pole is connected with the connection identification signal end Short_H of the microcontroller, and the negative pole is connected with the first end of the second voltage dividing resistor R7, the current can flow from the battery positive pole B+ to the second voltage dividing resistor R7 in one direction, so as to prevent the current from flowing reversely into the connection identification signal end Short_H of the microcontroller, thereby ensuring the safety and stability of the battery interface identification circuit 10.

[0038] As shown, Figure 1As shown, in one embodiment, the voltage conversion module 200 further includes a second current-limiting resistor R7. The first end of the second current-limiting resistor R7 is connected to the connection identification signal terminal Short_H of the microcontroller, and the second end of the second current-limiting resistor R7 is connected to the first end of the second electronic switch Q2. In this embodiment, when the battery management system power supply terminal VCC is powered on, and the connection identification signal terminal Short_H of the microcontroller is effectively connected to the positive terminal B+ of the battery, current flows through the connection identification signal terminal Short_H of the microcontroller and through the second current-limiting resistor R7. This limits the current flowing through the first end of the second electronic switch Q2, thereby preventing excessive current from flowing through the second electronic switch Q2 and protecting the stability of the voltage conversion module 200.

[0039] like Figure 1 As shown, in one embodiment, the voltage conversion module 200 further includes a third current-limiting resistor R8. The first end of the third current-limiting resistor R8 is connected to the second end of the second electronic switch Q2, and the second end of the third current-limiting resistor R8 is connected to the first end of the second voltage divider resistor R9. In this embodiment, when the second electronic switch Q2 is turned on, current flows from the second end of the second electronic switch Q2, through the third current-limiting resistor R8, and then to the second voltage divider resistor R9. At this time, the third current-limiting resistor R8 can limit the current flowing through the second electronic switch Q2, thereby ensuring that when the microcontroller's connection identification signal terminal Short_H is effectively connected to the battery positive terminal B+, the current flowing through the second electronic switch Q2 will not exceed the safe range, thus preventing the second electronic switch Q2 from being damaged by excessive current.

[0040] like Figure 1 As shown, in one embodiment, the reference voltage module 100 further includes a first feedback resistor R3. The first terminal of the first feedback resistor R3 is connected to the second terminal of the first electronic switch Q1, and the second terminal of the first feedback resistor R3 is grounded. In this embodiment, under low-temperature conditions, the voltage between the base and emitter of the first electronic switch Q1 may increase, leading to an operating point shift and affecting the overall performance of the battery interface identification circuit 10. Specifically, when the voltage between the base and emitter of the first electronic switch Q1 increases due to a decrease in temperature, the emitter current of the first electronic switch Q1 will increase. Through the negative feedback effect of the first feedback resistor R3, the increased emitter current of the first electronic switch Q1 will be partially converted into a voltage drop across the first feedback resistor R3, thereby reducing the base voltage of the first electronic switch Q1 to suppress operating point drift. This allows the first electronic switch Q1 to maintain a stable operating state with a smaller base current, thus reducing the power consumption of the battery interface identification circuit 10.

[0041] The battery management system comprises the battery interface identification circuit 10 according to any one of the above. In the embodiment, when the battery management system power supply end VCC is powered on, the current flows to the control end of the first electronic switch tube Q1 through the first current-limiting resistor R2, so that the control end voltage of the first electronic switch tube Q1 is greater than the conduction threshold voltage, thereby making the first electronic switch tube Q1 in the conduction state. At the same time, since the first voltage dividing resistor R1 is connected with the battery positive electrode B+, the voltage provided by the battery positive electrode B+ flows through the first voltage dividing resistor R1 and then through the first electronic switch tube Q1 to the ground end, thereby forming a stable voltage output in the loop formed by the first voltage dividing resistor R1, the first electronic switch tube Q1 and the first feedback resistor R3 and the ground end. When the connection identification signal end Short_H of the microcontroller is effectively connected with the battery positive electrode B+, the voltage of the battery positive electrode B+ is referenced by the connection identification signal end Short_H of the microcontroller, and the voltage is transmitted to the first end of the second electronic switch tube Q2 through the second voltage dividing resistor R7. At the same time, the voltage output by the battery positive electrode B+ flows through the first voltage dividing resistor R1 after being divided, and then is transmitted to the control end of the second electronic switch tube Q2 through the control resistor R5, so that the voltage at the first end of the second electronic switch tube Q2 is greater than the voltage at the control end of the second electronic switch tube Q2, thereby making the second electronic switch tube Q2 be turned on, so that the current is output from the second end of the second electronic switch tube Q2 to the second voltage dividing resistor R9. Then, the level signal is transmitted to the level signal receiving end MCU_IO of the microcontroller through the current-limiting resistor R10 connected with the second voltage dividing resistor R9, thereby making the microcontroller be able to judge whether the connection identification signal end Short_H of the microcontroller is effectively connected with the battery positive electrode B+ according to the received level signal. Further, when the battery management system is turned off or the connection identification signal end Short_H of the microcontroller is not effectively connected with the battery positive electrode B+, the battery management system power supply end VCC outputs a low-level signal, so that the control end voltage of the first electronic switch tube Q1 is lower than the conduction threshold voltage, thereby making the first electronic switch tube Q1 be in the cut-off state, so that the reference voltage cannot be generated, thereby making the voltage conversion module 200 unable to work, and the circuit has almost no power consumption. Further, when a plurality of external pins need to be identified, since the reference voltage module 100 outputs a stable voltage, only one voltage conversion module 200 needs to be added, without the need to separately configure a reference voltage module 100 for each voltage conversion module 200, thereby saving the circuit elements and wiring space, and thereby significantly reducing the overall power consumption of the battery interface identification circuit 10.

[0042] Compared with the prior art, the present disclosure has at least the following advantages:

[0043] 1. The battery interface identification circuit 10, in the battery management system shutdown or no connection state, due to the first electronic switch tube is in the off state, so that the reference voltage module 100 does not produce reference voltage, so that the reference voltage module 100 and voltage conversion module 200 have no energy loss, thereby effectively solve the problem of traditional circuit after shutdown still have power consumption, and then improve the energy use efficiency of battery interface identification circuit 10.

[0044] 2. In addition, due to the reference voltage module 100 and voltage conversion module 200 are relatively independent, and multiple voltage conversion module 200 can share the same reference voltage module 100, so that the battery interface identification circuit 10 can meet the different number of interface identification requirements, and then improve the scalability of battery interface identification circuit 10.

[0045] The above-described embodiments only express several embodiments of the present disclosure, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the disclosed patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present disclosure, a number of variations and improvements can be made, which are within the scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A battery interface identification circuit, characterized by The reference voltage module comprises a first electronic switch tube, a first voltage dividing resistor and a first current limiting resistor, a first end of the first current limiting resistor is used for being connected with a battery management system power supply end, a second end of the first current limiting resistor is connected with a control end of the first electronic switch tube, a first end of the first voltage dividing resistor is used for being connected with a positive electrode of a battery, a second end of the first voltage dividing resistor is connected with a first end of the first electronic switch tube, and a second end of the first electronic switch tube is grounded. The voltage conversion module comprises a second electronic switch tube, a signal current limiting resistor, a control resistor and a second voltage dividing resistor, a first end of the control resistor is connected with the second end of the first voltage dividing resistor, a second end of the control resistor is connected with a control end of the second electronic switch tube, a first end of the second voltage dividing resistor is connected with a second end of the second electronic switch tube, a second end of the second voltage dividing resistor is grounded, a first end of the signal current limiting resistor is connected with the first end of the second voltage dividing resistor, and a second end of the signal current limiting resistor is used for being connected with a level signal receiving end of a microcontroller.

2. The battery interface identification circuit of claim 1, wherein, The battery interface identification circuit further comprises a level inversion module, the level inversion module comprises a third electronic switch tube and a third voltage dividing resistor, a first end of the third voltage dividing resistor is used for being connected with the battery management system power supply end, a second end of the third voltage dividing resistor is connected with a first end of the third electronic switch tube, a control end of the third electronic switch tube is connected with the second end of the signal current limiting resistor, a second end of the third electronic switch tube is grounded, and the first end of the third electronic switch tube is further connected with the level signal receiving end of the microcontroller.

3. The battery interface identification circuit of claim 2, wherein, The reference voltage module further comprises a fourth voltage dividing resistor, a first end of the fourth voltage dividing resistor is connected with the second end of the first voltage dividing resistor, and a second end of the fourth voltage dividing resistor is connected with the first end of the first electronic switch tube.

4. The battery interface identification circuit of claim 3, wherein, The reference voltage module further comprises a first current conducting diode, a positive electrode of the first current conducting diode is used for being connected with the positive electrode of the battery, and a negative electrode of the first current conducting diode is connected with the first end of the first voltage dividing resistor.

5. The battery interface identification circuit of claim 1, wherein, The voltage conversion module further comprises a bias resistor, a first end of the bias resistor is connected with the control end of the second electronic switch tube, and a second end of the bias resistor is connected with the first end of the second electronic switch tube.

6. The battery interface identification circuit of claim 5, wherein, The voltage conversion module further comprises a second current conducting diode, a positive electrode of the second current conducting diode is used for being connected with a connection identification signal end of the microcontroller, and a negative electrode of the second current conducting diode is connected with the first end of the second voltage dividing resistor.

7. The battery interface identification circuit of claim 1, wherein, The voltage conversion module further comprises a second current limiting resistor, a first end of the second current limiting resistor is used for being connected with the connection identification signal end of the microcontroller, and a second end of the second current limiting resistor is connected with the first end of the second electronic switch tube.

8. The battery interface identification circuit of claim 7, wherein, The voltage conversion module further comprises a third current limiting resistor, a first end of the third current limiting resistor is connected with the second end of the second electronic switch tube, and a second end of the third current limiting resistor is connected with the first end of the second voltage dividing resistor.

9. The battery interface identification circuit of claim 1, wherein, The reference voltage module further comprises a first feedback resistor, a first end of the first feedback resistor is connected with the second end of the first electronic switch tube, and a second end of the first feedback resistor is grounded.

10. A battery management system, characterized by, The battery interface identification circuit comprises the battery interface identification circuit according to any one of claims 1 to 9.

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