Short-circuit detection circuit of BMS (Battery Management System) protection board and electronic equipment

Abstract

The utility model belongs to the technical field of short circuit detection, and discloses a short circuit detection circuit of a BMS (Battery Management System) protection board and electronic equipment, the circuit comprises a current acquisition module, a current signal amplification module, a voltage signal comparison module, a logic control module and a discharge control module, the current acquisition module acquires a first current signal of the cathode of the battery pack and outputs the first current signal to the current signal amplification module; the current signal amplification module samples the first current signal into a first voltage signal, amplifies the sampled first voltage signal into a second voltage signal and outputs the second voltage signal to the voltage signal comparison module; the voltage signal comparison module compares the second voltage signal with a preset reference voltage signal, generates a short-circuit signal and outputs the short-circuit signal to the logic control module; and the logic control module controls the turn-off of the MOS tube in the discharge control module according to the received short circuit signal. The circuit provided by the utility model effectively improves the short-circuit detection efficiency of the BMS protection board.

Description

Technical Field

[0001] The utility model belongs to the technical field of short-circuit detection, in particular to a short-circuit detection circuit of a BMS protection board and electronic equipment. Background Art

[0002] With breakthroughs in lithium battery technology and the promotion of the national carbon neutrality concept, the use of lithium battery technology in household energy storage products is becoming increasingly popular. Lithium battery packs can provide users with safe, reliable, and sustainable electricity. For a 5KW household energy storage product, the energy storage inverter has an AC output of 22A, and the normal discharge of the battery at the 48V BMS end can reach over 100A. Under high current conditions, it is particularly important for the BMS protection board to quickly implement discharge short-circuit detection. Many energy storage BMS protection boards implement short-circuit protection by using a single-chip microcomputer to determine whether the discharge current value reported by the ADC exceeds the threshold. However, this method has single-chip microcomputer ADC sampling delay, communication delay, and single-chip microcomputer processing delay, which will slow the short-circuit response speed of the BMS protection board.

[0003] In view of this, how to improve the efficiency of BMS protection board short circuit detection is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In order to solve the technical problem of the slow short-circuit response speed of the BMS protection board, the utility model provides a short-circuit detection circuit and electronic equipment for the BMS protection board.

[0005] In a first aspect, the utility model provides a short-circuit detection circuit for a BMS protection board, the circuit comprising: a current acquisition module, a current signal amplification module, a voltage signal comparison module, a logic control module, and a discharge control module;

[0006] The current acquisition module is connected to the current signal amplification module, and the current acquisition module is used to acquire the first current signal of the negative electrode of the battery pack and output the acquired first current signal to the current signal amplification module;

[0007] The current signal amplifying module is connected to the voltage signal comparing module, and the current signal amplifying module is used to sample the first current signal into a first voltage signal, amplify the sampled first voltage signal into a second voltage signal, and output the second voltage signal to the voltage signal comparing module;

[0008] The voltage signal comparison module is connected to the logic control module, and is used to compare the second voltage signal with a preset reference voltage signal, generate a short-circuit signal, and output the short-circuit signal to the logic control module;

[0009] The logic control module is connected to the discharge control module, and the logic control module controls the shutoff of the MOS tube in the discharge control module according to the received short-circuit signal.

[0010] Furthermore, the current acquisition module includes a first resistor R3, a second resistor R5, and a third resistor R4, and the current signal amplification module includes a differential amplifier U1, a fourth resistor R2, a fifth resistor R1, a sixth resistor R7, a seventh resistor R8, and an eighth resistor R6;

[0011] The first resistor R3, the second resistor R5 and the third resistor R4 are connected in parallel;

[0012] One end of the fourth resistor R2 is connected to the third resistor R4, and the other end of the fourth resistor R2 is connected to the fifth resistor R1 and the inverting input terminal of the differential amplifier U1 respectively;

[0013] One end of the sixth resistor R7 is connected to the third resistor R4, and the other end of the sixth resistor R7 is connected to the seventh resistor R8 and the positive input terminal of the differential amplifier U1 respectively;

[0014] The output end of the differential amplifier U1 is connected to the fifth resistor R1 and the eighth resistor R6 respectively.

[0015] Furthermore, the voltage signal comparison module includes an operational amplifier comparator U2, a ninth resistor R18, a tenth resistor R21, and an eleventh resistor R17;

[0016] The positive input terminal of the operational amplifier comparator U2 is connected to the output terminal of the differential amplifier U1, the negative input terminal of the operational amplifier comparator U2 is connected to the ninth resistor R18 and the tenth resistor R21 respectively, and the output terminal of the operational amplifier comparator is connected to the eleventh resistor R17;

[0017] The ninth resistor R18 is connected to the preset reference voltage signal.

[0018] Furthermore, the short circuit detection circuit also includes a microcontroller module;

[0019] The microcontroller module is connected to the logic control module and the voltage signal comparison module respectively, and the logic control module generates an interrupt signal according to the received short-circuit signal and outputs the generated interrupt signal to the microcontroller module;

[0020] The microcontroller module enables a short-circuit holding signal according to a received interrupt signal, and outputs the short-circuit holding signal to the voltage signal comparison module.

[0021] Furthermore, the logic control module includes a first diode D3, and the discharge control module includes a first MOS transistor Q3 and a second MOS transistor Q4;

[0022] An anode of the first diode D3 is connected to the eleventh resistor R17 , and a cathode of the first diode D3 is connected to the first MOS transistor Q3 and the second MOS transistor Q4 , respectively.

[0023] Furthermore, the short-circuit detection circuit further includes a reverse connection detection module, which is connected to the logic control module and the microcontroller module respectively;

[0024] The reverse connection detection module is used to detect whether the rear pole load is reversely connected, and send the detection result to the logic control module and the microcontroller module;

[0025] The logic control module controls the shutdown of the MOS tube in the discharge control module according to the received detection result, and sends the shutdown signal of the MOS tube to the microcontroller module.

[0026] Furthermore, the reverse connection detection module includes a first photocoupler U13 and a second photocoupler U14, wherein the first photocoupler U13 is connected to the negative electrode of the BMS protection board, and the second photocoupler U14 is connected to the positive electrode of the battery pack.

[0027] Furthermore, the logic control module further includes a second diode D1, and the reverse connection detection module further includes a twelfth resistor R10;

[0028] One end of the twelfth resistor R10 is connected to the second diode D1, and the other end of the twelfth resistor R10 is connected to the first photocoupler U13 and the second photocoupler U14 respectively;

[0029] The second diode D1 is connected to the first MOS transistor Q3.

[0030] Furthermore, the discharge control module further includes a third MOS tube Q1 and a fourth MOS tube Q2;

[0031] The third MOS transistor Q1 is connected to the positive input terminal of the operational amplifier comparator, and the fourth MOS transistor Q2 is connected to the second diode D1.

[0032] In a second aspect, the present invention provides an electronic device, comprising a device body and a short-circuit detection circuit of the BMS protection board as described in any one of the first aspects above, which is arranged on the device body.

[0033] Compared to the prior art, the short-circuit detection circuit for the BMS protection board provided by the present invention compares the second voltage signal with a preset reference voltage signal through a voltage signal comparison module to generate a short-circuit signal. This short-circuit signal is then output to a logic control module to control the shutdown of the MOS transistor in the discharge control module. The circuit provided by the present embodiment effectively improves the efficiency of short-circuit detection in the BMS protection board. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the framework structure of a short-circuit detection circuit of a BMS protection board provided in an embodiment of the utility model;

[0035] Figure 2 A schematic diagram of the circuit structure of a current acquisition and amplification module provided in an embodiment of the present utility model;

[0036] Figure 3 A schematic diagram of the structure of a short-circuit detection circuit of a BMS protection board provided in an embodiment of the utility model;

[0037] Figure 4 A schematic diagram of the circuit structure of a reverse connection detection module provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In order to make the description of the present disclosure more detailed and complete, the following is an illustrative description of the implementation methods and specific examples of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation methods cover the features of multiple specific embodiments and the method steps and their sequence for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0041] In the description of the embodiments of the present invention, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is merely a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two, and other quantifiers should be understood similarly. The preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In order to solve the technical problem of slow short-circuit response speed of the existing BMS protection board, the utility model provides a short-circuit detection circuit of the BMS protection board. Please refer to Figure 1-2 , Figure 1 This is a schematic diagram of the framework structure of a short-circuit detection circuit of a BMS protection board provided by an embodiment of the utility model. Figure 2 A schematic diagram of the circuit structure of a current acquisition and amplification module provided in an embodiment of the present utility model. The short-circuit detection circuit of the BMS protection board includes: a current acquisition module, a current signal amplification module, a voltage signal comparison module, a logic control module, and a discharge control module; the current acquisition module is connected to the current signal amplification module, the current acquisition module is used to acquire a first current signal at the negative electrode of the battery pack and output the acquired first current signal to the current signal amplification module; the current signal amplification module is connected to the voltage signal comparison module, the current signal amplification module is used to sample the first current signal into a first voltage signal, amplify the sampled first voltage signal into a second voltage signal, and output the second voltage signal to the voltage signal comparison module; the voltage signal comparison module is connected to the logic control module, the voltage signal comparison module is used to compare the second voltage signal with a preset reference voltage signal, generate a short-circuit signal, and output the short-circuit signal to the logic control module; the logic control module is connected to the discharge control module, and the logic control module controls the shutdown of the MOS transistor in the discharge control module according to the received short-circuit signal. The utility model compares the second voltage signal with a preset reference voltage signal through a voltage signal comparison module. If the voltage value of the second voltage signal is greater than the voltage value of the preset reference voltage, the voltage signal comparison module will generate a short-circuit signal and output the short-circuit signal to the logic control module. The logic control module can directly control the shutdown of the MOS tube in the discharge control module without the need to sample the digital signal through a single-chip microcomputer, thereby avoiding the sampling delay and communication delay of the single-chip microcomputer and effectively improving the short-circuit detection efficiency of the BMS protection board.

[0043] As a further preferred, the current acquisition module comprises a first resistor R3, a second resistor R5, a third resistor R4, the current signal amplification module comprises a differential amplifier U1, a fourth resistor R2, a fifth resistor R1, a sixth resistor R7, a seventh resistor R8 and an eighth resistor R6; the first resistor R3, the second resistor R5 and the third resistor R4 are connected in parallel; one end of the fourth resistor R2 is connected with the third resistor R4, and the other end of the fourth resistor R2 is connected with the fifth resistor R1 and the reverse input end of the differential amplifier U1 respectively; one end of the sixth resistor R7 is connected with the third resistor R4, and the other end of the sixth resistor R7 is connected with the seventh resistor R8 and the positive input end of the differential amplifier U1 respectively; the output end of the differential amplifier U1 is connected with the fifth resistor R1 and the eighth resistor R6 respectively. Specifically, in the embodiment of the utility model, a plurality of sampling resistors can be connected in series between the negative electrode of the battery pack and the MOS tube of the discharge control module, so as to reduce the resistance value of the sampling resistor, and the first resistor R3, the second resistor R5 and the third resistor R4 are connected in parallel in the embodiment of the utility model, so as to reduce the resistance value of the sampling resistor. In addition, the current amplification module further comprises a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected with the fifth resistor R1 in parallel, and the second capacitor C2 is connected with the seventh resistor R8 in parallel, wherein the first capacitor C1 and the second capacitor C2 are used for filtering high-frequency interference.

[0044] As a further preferred, please refer to Figure 3 , Figure 3This is a structural schematic diagram of a short-circuit detection circuit for a BMS protection board provided in an embodiment of the present utility model. The voltage signal comparison module includes an operational amplifier comparator U2, a ninth resistor R18, a tenth resistor R21, and an eleventh resistor R17; the positive input terminal of the operational amplifier comparator U2 is connected to the output terminal of the differential amplifier U1, the reverse input terminal of the operational amplifier comparator U2 is connected to the ninth resistor R18 and the tenth resistor R21, and the output terminal of the operational amplifier comparator is connected to the eleventh resistor R17; the ninth resistor R18 is connected to the preset reference voltage signal. Specifically, in an embodiment of the present invention, the total resistance of the sampling resistors after parallel connection can be preset to be 0.2mR, and the rated discharge current is 100A. When the short-circuit threshold circuit is 200A, the voltage V1 across the sampling resistor is 40mV. After amplification by the differential proportional amplifier circuit, the voltage is Vo=40mV*(47K / 1.2K)≈1.5V. Therefore, the reference voltage can be preset to 1.5V. When the voltage value of the second voltage signal is greater than 1.5V, a short-circuit signal is generated. In addition, the voltage signal comparison module also includes a third capacitor C3, a fourth capacitor C4, a thirteenth resistor R11, a fourteenth resistor R15, and a third diode D2. The third capacitor C3 is connected in parallel with the thirteenth resistor R11. The third diode D2 is connected to the circuit formed by the parallel connection of the third capacitor C3 and the thirteenth resistor R11. One end of the fourteenth resistor R15 is connected to the output end of the differential amplifier U1, and the other end of the fourteenth resistor R15 is connected to the eleventh resistor R17.

[0045] As a further preferred embodiment, the short-circuit detection circuit further includes a microcontroller module; the microcontroller module is respectively connected to the logic control module and the voltage signal comparison module, the logic control module generates an interrupt signal according to the received short-circuit signal, and outputs the generated interrupt signal to the microcontroller module; the microcontroller module enables a short-circuit holding signal according to the received interrupt signal, and outputs the short-circuit holding signal to the voltage signal comparison module. Specifically, in an embodiment of the present invention, after receiving the interrupt signal, the microcontroller module will initiate a short-circuit holding control, and the short-circuit holding control will not be released until the short-circuit rear-stage load is removed. However, before releasing the short-circuit holding control, it is necessary to first enable the short-circuit holding signal, so that the voltage level of the entire short-circuit detection circuit tends to stabilize before releasing the short-circuit protection.

[0046] As a further preferred embodiment, the logic control module includes a first diode D3, and the discharge control module includes a first MOS transistor Q3 and a second MOS transistor Q4; the anode of the first diode D3 is connected to the eleventh resistor R17, and the cathode of the first diode D3 is connected to the first MOS transistor Q3 and the second MOS transistor Q4, respectively. Specifically, in an embodiment of the present invention, when the discharge current is less than a threshold value of 200A, the voltage value of the second voltage signal is less than 1.5V, and the op amp comparator outputs a low level. At this time, the first diode D3 is not conductive, and the first MOS transistor Q3 and the second MOS transistor Q4 are conductive. When the second current signal is greater than the threshold value of 200A, the second voltage signal is greater than 1.5V, and the comparator outputs a high level. At this time, the first diode D3 is conductive, the first MOS transistor Q3 is disabled, and the second MOS transistor Q4 is conductive, generating a short-circuit interrupt to the microcontroller module, notifying the microcontroller of the occurrence of the short-circuit event. In addition, the discharge control module further includes a fifteenth resistor R12, a sixteenth resistor R14, a seventeenth resistor R22, an eighteenth resistor R23, a nineteenth resistor R19, and a twentieth resistor R20. One end of the sixteenth resistor R14 is connected to the fifteenth resistor R12, and the other end of the sixteenth resistor R14 is connected to the first MOS transistor Q3. The seventeenth resistor R22 is connected to the second MOS transistor Q4. One end of the eighteenth resistor R23 is connected to the seventeenth resistor R22, and the other end of the eighteenth resistor R23 is grounded. The collector of the first MOS transistor Q3 is connected to the nineteenth resistor R19 and the twentieth resistor R20, respectively.

[0047] As a further preferred embodiment, the short-circuit detection circuit further includes a reverse connection detection module, which is connected to the logic control module and the microcontroller module respectively; the reverse connection detection module is used to detect whether the rear pole load is reversely connected, and sends the detection result to the logic control module and the microcontroller module; the logic control module controls the shutdown of the MOS tube in the discharge control module according to the received detection result, and sends the shutdown signal of the MOS tube to the microcontroller module. Specifically, in an embodiment of the present invention, if the positive and negative poles of the rear pole load are reversed, the reverse connection detection module will directly generate an interrupt to report to the microcontroller, and at the same time notify the logic control module to control the shutdown of the MOS tube in the discharge control module.

[0048] Please refer to Figure 4 , Figure 4A schematic diagram of the circuit structure of a reverse connection detection module provided in an embodiment of the present invention. As a further preferred embodiment, the reverse connection detection module includes a first photocoupler U13 and a second photocoupler U14. The first photocoupler U13 is connected to the negative electrode of the BMS protection board, and the second photocoupler U14 is connected to the positive electrode of the battery pack. Specifically, in an embodiment of the present invention, when the negative electrode of the BMS protection board is connected to the positive electrode of the inverter, and the positive electrode of the battery pack is connected to the negative electrode of the inverter, the inverter and the BMS protection board are connected reversely. At this time, the first photocoupler U13 and the second photocoupler U14 will be turned on, the DET_IVN_CHG signal will be pulled low, an interrupt signal will be generated, and the interrupt signal will be sent to the microcontroller module to inform the microcontroller of the occurrence of the reverse connection event. At the same time, the IVN_CHG signal will output a high level to drive the MOS tube in the discharge control module to be cut off. In addition, the reverse connection detection module also includes a twenty-first resistor R285, a twenty-second resistor R286, a twenty-third resistor R292, a twenty-fourth resistor R291, a fifth capacitor C84, a fourth diode D16 and a fifth diode D18, one end of the twenty-first resistor R285 is connected to the first photoelectric coupler U13, one end of the twenty-second resistor R286 is connected to the first photoelectric coupler U13, the other end of the twenty-second resistor R286 is connected to the fourth diode D16, one end of the twenty-fourth resistor R291 is connected to the second photoelectric coupler U14, and the other end of the twenty-fourth resistor R291 is respectively connected to the fifth capacitor C84 and the reference voltage.

[0049] As a further preferred embodiment, the logic control module further includes a second diode D1, and the reverse connection detection module further includes a twelfth resistor R10; one end of the twelfth resistor R10 is connected to the second diode D1, and the other end of the twelfth resistor R10 is respectively connected to the first photoelectric coupler U13 and the second photoelectric coupler U14; the second diode D1 is connected to the first MOS tube Q3. Specifically, in an embodiment of the present invention, when the microprocessor module detects a reverse connection or a short circuit interruption in the short circuit detection circuit, the third diode D2 will immediately enable the short circuit holding signal, so that Q3 is continuously in the on state, avoiding repeated overcurrent detection. In addition, the discharge control module further includes a twenty-fifth resistor R13, one end of the twenty-fifth resistor R13 is connected to the second diode D1, and the other end of the twenty-fifth resistor R13 is connected to the sixteenth resistor R14.

[0050] As a further preferred embodiment, the discharge control module further includes a third MOS transistor Q1 and a fourth MOS transistor Q2; the third MOS transistor Q1 is connected to the positive input terminal of the operational amplifier comparator, and the fourth MOS transistor Q2 is connected to the second diode D1. Specifically, in an embodiment of the present invention, when the short-circuit load is released, the microprocessor first enables the short-circuit prohibition signal for 2 mS to ensure that the residual charge in the circuit is completely released, and then activates the short-circuit holding signal to re-enable short-circuit detection. The third MOS transistor Q3 sends the emitted DETZ-IRS signal to the voltage signal comparison module to prohibit the operational amplifier comparator U2 from performing overcurrent detection.

[0051] Based on the above-mentioned short-circuit detection circuit of the BMS protection board, an embodiment of the present application further provides an electronic device, which includes a device body and a short-circuit detection circuit of the BMS protection board as described above, which is arranged in the device body.

[0052] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments merely represent preferred implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A short circuit detection circuit for a BMS protection board, characterized in that: include: Current acquisition module, current signal amplification module, voltage signal comparison module, logic control module, and discharge control module; The current acquisition module is connected to the current signal amplification module, and the current acquisition module is used to acquire the first current signal of the negative electrode of the battery pack and output the acquired first current signal to the current signal amplification module; The current signal amplifying module is connected to the voltage signal comparing module, and the current signal amplifying module is used to sample the first current signal into a first voltage signal, amplify the sampled first voltage signal into a second voltage signal, and output the second voltage signal to the voltage signal comparing module; The voltage signal comparison module is connected to the logic control module, and is used to compare the second voltage signal with a preset reference voltage signal, generate a short-circuit signal, and output the short-circuit signal to the logic control module; The logic control module is connected to the discharge control module, and the logic control module controls the shutoff of the MOS tube in the discharge control module according to the received short-circuit signal.

2. The short-circuit detection circuit of the BMS protection board according to claim 1, characterized in that: The current acquisition module includes a first resistor R3, a second resistor R5, and a third resistor R4; the current signal amplification module includes a differential amplifier U1, a fourth resistor R2, a fifth resistor R1, a sixth resistor R7, a seventh resistor R8, and an eighth resistor R6; The first resistor R3, the second resistor R5 and the third resistor R4 are connected in parallel; One end of the fourth resistor R2 is connected to the third resistor R4, and the other end of the fourth resistor R2 is connected to the fifth resistor R1 and the inverting input terminal of the differential amplifier U1 respectively; One end of the sixth resistor R7 is connected to the third resistor R4, and the other end of the sixth resistor R7 is connected to the seventh resistor R8 and the positive input terminal of the differential amplifier U1 respectively; The output end of the differential amplifier U1 is connected to the fifth resistor R1 and the eighth resistor R6 respectively.

3. The short circuit detection circuit of the BMS protection board according to claim 2, characterized in that: The voltage signal comparison module includes an operational amplifier comparator U2, a ninth resistor R18, a tenth resistor R21, and an eleventh resistor R17; The positive input terminal of the operational amplifier comparator U2 is connected to the output terminal of the differential amplifier U1, the negative input terminal of the operational amplifier comparator U2 is connected to the ninth resistor R18 and the tenth resistor R21 respectively, and the output terminal of the operational amplifier comparator is connected to the eleventh resistor R17; The ninth resistor R18 is connected to the preset reference voltage signal.

4. The short-circuit detection circuit of the BMS protection board according to claim 3, characterized in that: The short circuit detection circuit also includes a microcontroller module; The microcontroller module is connected to the logic control module and the voltage signal comparison module respectively, and the logic control module generates an interrupt signal according to the received short-circuit signal and outputs the generated interrupt signal to the microcontroller module; The microcontroller module enables a short-circuit holding signal according to a received interrupt signal, and outputs the short-circuit holding signal to the voltage signal comparison module.

5. The short-circuit detection circuit of the BMS protection board according to claim 4, characterized in that: The logic control module includes a first diode D3, and the discharge control module includes a first MOS transistor Q3 and a second MOS transistor Q4; An anode of the first diode D3 is connected to the eleventh resistor R17 , and a cathode of the first diode D3 is connected to the first MOS transistor Q3 and the second MOS transistor Q4 , respectively.

6. The short-circuit detection circuit of the BMS protection board according to claim 5, characterized in that: The short circuit detection circuit further includes a reverse connection detection module, which is connected to the logic control module and the microcontroller module respectively; The reverse connection detection module is used to detect whether the rear pole load is reversely connected, and send the detection result to the logic control module and the microcontroller module; The logic control module controls the shutdown of the MOS tube in the discharge control module according to the received detection result, and sends the shutdown signal of the MOS tube to the microcontroller module.

7. The short-circuit detection circuit of the BMS protection board according to claim 6, characterized in that: The reverse connection detection module includes a first photocoupler U13 and a second photocoupler U14. The first photocoupler U13 is connected to the negative electrode of the BMS protection board, and the second photocoupler U14 is connected to the positive electrode of the battery pack.

8. The short-circuit detection circuit of the BMS protection board according to claim 7, characterized in that: The logic control module further includes a second diode D1, and the reverse connection detection module further includes a twelfth resistor R10; One end of the twelfth resistor R10 is connected to the second diode D1, and the other end of the twelfth resistor R10 is connected to the first photocoupler U13 and the second photocoupler U14 respectively; The second diode D1 is connected to the first MOS transistor Q3.

9. The short-circuit detection circuit of the BMS protection board according to claim 8, characterized in that: The discharge control module further includes a third MOS tube Q1 and a fourth MOS tube Q2; The third MOS transistor Q1 is connected to the positive input terminal of the operational amplifier comparator, and the fourth MOS transistor Q2 is connected to the second diode D1.

10. An electronic device, characterized in that: The invention comprises a device body and a short-circuit detection circuit of the BMS protection board as claimed in any one of claims 1 to 9, which is arranged on the device body.

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