Direct-current double-charging-gun CC2 signal detection circuit and method, battery management system and vehicle

Abstract

The invention discloses a direct-current double-charging-gun CC2 signal detection circuit and method, an electric tube management system and a vehicle. The signal detection circuit comprises an input module, an output module, a 5V power supply module, a detection chip, a CC2 signal identification module I and a CC2 signal identification module II; the output ends SC1, SC2 and SC3 of the input module are connected with the first pin, the second pin and the third pin of the output module, the output ends VT and VP of the output module are connected with the input ends TCC2 and TP of the detection chip, the output end LK of the detection chip is connected with the first pin of the enabling self-locking module, the second pin of the enabling self-locking module is connected with the enabling input end EN of the 5V power supply module, the 5V power supply module supplies power to the output module and the detection chip, and the power supply module supplies power to the output module and the detection chip. The output ends of the CC2 signal identification module I and the CC2 signal identification module II are connected with the input ends 1CC2 and 2CC2 of the input module; and the output end Wake of the output module is connected with the enabling input end EN of the 5V power supply module. The circuit is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging detection, and in particular to a DC dual charging gun CC2 signal detection circuit and method, a battery management system and a vehicle. Background Art

[0002] At present, the DC fast charging of electric vehicle power battery systems has two modes: single-gun charging and multi-gun charging. The purpose is to shorten the charging time of large-capacity power battery systems. Multi-gun charging modes include dual-gun, triple-gun, quad-gun, etc. For different power battery system capacities, the number of DC charging guns increases accordingly. Accordingly, the battery management system BMS (Battery Management System) adapted in the battery system needs to add an identification port for DC charging guns. The purpose is to wake up the BMS with a charging signal or put the BMS into a DC charging mode, that is, to wake up the BMS or put the BMS into a DC charging mode through the charging connection confirmation signal CC2 specified in the national charging standard (able to identify which charging gun is inserted or unplugged).

[0003] In the current common BMS application scheme, a charging identification port CC2 in the main detection chip of the BMS is generally used to detect a charging gun. There are several identification ports configured for several charging guns, which leads to tight port resources of the main detection chip or even insufficient port resources. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and defects of the prior art and to provide a DC dual charging gun CC2 signal detection circuit and detection method, a battery management system and a vehicle. The detection port of the detection circuit can detect the CC signals of multiple charging guns, aiming to solve the problem of tight detection port resources.

[0005] In the first aspect of the present invention, a DC dual charging gun CC2 signal detection circuit is provided, comprising an input module, an output module, a 5V power supply module, a detection chip, a CC2 signal identification module 1 and a CC2 signal identification module 2; the output terminals SC1, SC2 and SC3 of the input module are connected to the 1st, 2nd and 3rd pins of the output module, the output terminals VT and VP of the output module are connected to the input terminals TCC2 and TP of the detection chip, the output terminal LK of the detection chip is connected to the 1st pin of the enable self-locking module, the 2nd pin of the enable self-locking module is connected to the enable input terminal EN of the 5V power supply module, the 1st pin of the 5V power supply module is connected to the power input terminal VDD of the output module and the power input terminal Vdd of the detection chip, the output terminals of the CC2 signal identification module 1 and the CC2 signal identification module 2 are respectively connected to the input terminals 1CC2 and 2CC2 of the input module; the output terminal Wake of the input module is connected to the enable input terminal EN of the 5V power supply module, the 2nd pin of the 5V power supply module and the power input terminal PWR of the input module are connected to the external 12V / 24V power supply.

[0006] Wherein, the input module includes resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R13, R16, voltage regulator tubes Z1, Z2, Z3, Z4, Z5, Z6, diodes D1, D2, and switch tubes Q1, Q2, Q3, Q4, Q5; Pin 1 of resistor R1 is connected to the output end of the external 12v / 24v power supply and pin 1 of resistors R9, R3, R5, and R7; Pin 2 of resistor R1 is connected to pin 1 input end 1CC2 of the input module, the cathode of voltage regulator tube Z3, and pin 1 of resistor R2; the anode of voltage regulator tube Z3 The cathode of the voltage regulator tube Z4 is connected, and the anode of the voltage regulator tube Z4 is connected to the ground terminal; the 2nd pin of the resistor R2 is connected to the gate G of the switch tube Q1; the source S of the switch tube Q1 is connected to the 2nd pin of the resistor R3, and the drain D of the switch tube Q1 is connected to the control terminal V1, the 1st pin of the resistor R4, the gate G of the switch tube Q2, and the 1st pin of the resistor R11; the 2nd pin of the resistor R4 is connected to the ground terminal; the 2nd pin of the resistor R11 is respectively connected to the cathode of the voltage regulator tube Z5 and the anode of the diode D1; the anode of the voltage regulator tube Z5 is connected to the ground terminal; the cathode of the diode D1 is respectively connected to the cathode of the diode D2 and the 1st pin of the resistor R16, and the Pin 2 of resistor R16 is grounded; the drain D of switch tube Q2 is connected to the output terminal SC1 of the input module, and the source S of switch tube Q2 is connected to the ground terminal; pin 2 of resistor R9 is connected to the control terminal P, pin 1 of resistor R10, and gate G of switch tube Q5; pin 2 of resistor R10 is connected to the ground terminal; source S of switch tube Q3 is connected to pin 2 of resistor R7; gate G of switch tube Q3 is connected to pin 2 of resistor R6; drain D of switch tube Q3 is connected to control terminal V2, pin 1 of resistor R8, gate G of switch tube Q4, and pin 1 of resistor R13, and pin 2 of resistor R13 is respectively connected to voltage regulator tube Z6 the cathode of the switching tube Q4 and the anode of the diode D2; the drain D of the switching tube Q4 is connected to the output terminal SC2 of the input module; the source S of the switching tube Q4 is connected to the ground terminal; the source S of the switching tube Q5 is connected to the ground terminal; the drain D of the switching tube Q5 is connected to the output terminal SC3 of the input module; the 2nd pin of the resistor R6 is connected to the input terminal 2CC2 of the input module; the 2nd pin of the resistor R6 is also connected to the cathode of the voltage regulator tube Z1 and the 2nd pin of the resistor R5 respectively; the anode of the voltage regulator tube Z1 is connected to the cathode of the voltage regulator tube Z2; the anode of the voltage regulator tube Z2 is connected to the ground terminal; the cathode of the diode D2 is connected to the output terminal Wake of the input module.

[0007] Wherein, the output module includes resistors R20, R21, R22, R23, R24, R25, R26, and switch Q6; pin 1 of the resistor R20 is connected to the output terminal SC3 of the input module and the gate G of the switch Q6, and pin 2 of the resistor R20 is connected to the drain D of the switch Q6 and the power input terminal VDD of the output module; pin 1 of the resistor R21 is connected to the output terminal SC1 of the input module, pin 2 of the resistor R21 is connected to the output terminal VT of the output module, pin 1 of the resistor R22 is connected to the output terminal SC2 of the input module, pin 2 of the resistor R22 is connected to the output terminal VT of the output module and pin 1 of the resistor R24, the source S of the switch Q6 is connected to pin 1 of the resistor R23 and pin 1 of the resistor R25, pin 2 of the resistor R23 is connected to the output terminal VT of the output module, pin 2 of the resistor R25 is connected to the output terminal VP of the output module, pin 1 of the resistor R26 is connected to the output terminal VP of the output module, and pin 2 of the resistor R26 and pin 2 of the resistor R24 ​​are grounded.

[0008] The CC2 signal identification module 1 and the CC2 signal identification module 2 respectively include a resistor RC, one end of the two resistors RC is connected to the input ends 1CC2 and 2CC2 of the input module, and the other ends of the two resistors RC are connected to the ground end.

[0009] The second aspect of the present invention provides a DC dual charging gun CC2 signal detection method, which is implemented based on the DC dual charging gun CC2 signal detection circuit. The output signals of the output terminals VT and VP of the output module are used to judge the 12v / 24v power supply voltage access status and the access status of charging gun one and charging gun two. According to the 12v / 24v power supply voltage access status and the access status of charging gun one and charging gun two, the BMS is not woken up, or the dormant BMS is woken up, or the awakened BMS is put into DC charging mode.

[0010] Among them, the output terminal VT has four signal status outputs, including no charging gun inserted, only charging gun 1 inserted, only charging gun 2 inserted, and both charging gun 1 and charging gun 2 inserted; the output terminal VP has two power signal states, including power access and no power access; the detection chip pre-stores the two power signal states of the output terminal VP and the four charging gun access states output by the output terminal VT, sets and stores the correspondence between the power signal state of the output terminal VP and the charging gun access state of the output terminal VT; the BMS software determines the access state of charging gun 1 or charging gun 2 according to the stored correspondence based on the two power signal states of the output terminal currently received.

[0011] Among them, when there is no 12v / 24v power supply voltage connected, the output terminals SC1, SC2, and SC3 of the input module are all in high-impedance state. Correspondingly, the output terminals VT and VP of the output module are both low level 0v. Since there is no 12v / 24v power supply connected, there is no 5v power output at pin 1 of the 5v power supply module, and the output terminal Wake of the input module is low level, and the BMS is not woken up; the output terminal LK of the detection chip has no self-locking control signal output, and there is no self-locking enable signal output at pin 2 of the self-locking enable module.

[0012] Among them, when the 12v / 24v power supply voltage is connected, the following methods are used to determine whether to wake up the dormant BMS and put the BMS into DC charging mode:

[0013] When there is an external 12v / 24v power input and no charging gun is inserted, for the BMS in the dormant state, the input terminals 1CC2 and 2CC2 of the input module are high level, and their voltage is equal to the 12v / 24v power supply voltage; the output terminal Wake of the input module is low level, so that there is no 5v power output at pin 1 of the 5v power supply module, then the input terminal VDD of the output module and the input terminal Vdd of the detection chip have no 5v power input, and the dormant BMS will not be awakened, and will not enter the DC charging mode; at this time, the output terminal SC3 of the input module is low level, and the output terminal VP of the output module is low level 0v; the output terminals SC1 and SC2 of the input module are all in high impedance state, then the output terminal VT of the output module is low level 0v; the output terminal LK of the detection chip has no self-locking control signal output, and the pin 2 of the enabling self-locking module has no self-locking enable signal output;

[0014] When there is an external 12v / 24v power input and no charging gun is inserted, for the BMS that is awakened by other Wake signals other than the output terminal and is in the awakened state, the 1st pin of the 5v power module has a 5v power output, the input terminal VDD of the output module and the input terminal Vdd of the detection chip have a 5v power input, the output terminal VT of the output module is a high level of 5v, and the output terminal VP of the output module is a high level of 4v, then the BMS determines that there is an external power input but no charging gun is inserted, and will not enter the DC charging mode;

[0015] When there is an external 12v / 24v power input and a charging gun is inserted, the output terminal Wake of the input module becomes high level, and the BMS is woken up and the charging gun 1 and / or the charging gun is inserted in the following way:

[0016] When only a charging gun is inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has a 5v power input, thereby waking up the BMS; once the charging gun is inserted, the output terminal SC1 of the input module is low level 0v, and the output terminal SC2 is high impedance. When the output terminal VT of the output module changes from low level 0v to high level 3.33v, the BMS software determines that a charging gun is inserted, and the BMS immediately enters the DC charging mode;

[0017] When only the second charging gun is inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has a 5v power input, thereby waking up the BMS; the insertion of the second charging gun makes the output terminal SC1 of the input module high impedance and the output terminal SC2 low level 0v, and the output terminal VT of the output module changes from low level 0v to high level 2.5v. At this time, the BMS software determines that the second charging gun is inserted, and the BMS immediately enters the DC charging mode;

[0018] When both charging gun 1 and charging gun 2 are inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has 5v power input, thereby waking up the BMS; when both charging gun 1 and charging gun 2 are inserted, the output terminals SC1 and SC2 of the input module are both low level 0v, and the output terminal VT of the output module changes from low level 0v to high level 2v. At this time, the BMS software determines that both charging gun 1 and charging gun 2 are inserted, and the BMS immediately enters the DC charging mode;

[0019] Among them, after the BMS software determines that charging gun 1 and / or charging gun 2 are inserted, it controls the output terminal LK of the detection chip to output a power self-locking signal, enables the 2nd foot of the self-locking module to output a wake-up signal, controls the 5v power supply module to maintain 5v power output, and keeps the BMS in a wake-up state;

[0020] For a BMS that is awakened by a Wake signal other than the output terminal, the insertion of the charging gun 1 and / or the charging gun 2 is determined in the following manner, and the BMS enters the DC charging mode:

[0021] When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 3.33v, the BMS software determines that a charging gun is inserted, and the BMS immediately enters the DC charging mode;

[0022] When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 2.5v, the BMS software determines that a second charging gun is inserted, and the BMS immediately enters the DC charging mode;

[0023] When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 2v, the BMS software determines that both charging gun 1 and charging gun 2 are plugged in, and the BMS immediately enters the DC charging mode;

[0024] When charging gun 1 or charging gun 2 is unplugged, the BMS does not exit the DC charging mode, and since the output terminal Wake of the input module maintains a high level, the BMS will not enter the sleep state; when both charging gun 1 and charging gun 2 are unplugged, the BMS exits the DC charging mode, and if there is other wake-up signal, the BMS will not enter the sleep state; if there is no other wake-up signal, the output terminal Wake of the input module is a low level, and the BMS enters the sleep state.

[0025] A third aspect of the present invention provides a battery management system that uses a DC dual charging gun CC2 signal detection method to perform DC dual charging gun CC2 signal detection.

[0026] A fourth aspect of the present invention provides a vehicle, comprising the battery management system; or provided with the DC dual charging gun CC2 signal detection circuit.

[0027] The dual DC charging gun CC2 signal detection circuit of the present invention has a simple structure, and the components used are all universal models, which can be implemented with domestic devices; the present invention adopts a detection chip (i.e., a single-chip microcomputer) whose detection input port has four signal state outputs, which can detect the CC2 signals of two charging guns and save the precious port resources of the detection chip; it directly uses the BMS external input power supply, that is, it is compatible with the vehicle-mounted 12v / 24v battery, and the BMS does not need to perform power supply voltage conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a first schematic diagram of the CC2 signal detection circuit of the dual DC charging gun of the present invention;

[0029] Figure 2 It is a second schematic diagram of the CC2 signal detection circuit of the dual DC charging gun of the present invention; DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with 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 used to limit the present invention.

[0031] See also Figure 1 , Figure 2The DC dual charging gun CC2 signal detection circuit of the present invention comprises an input module 100, an output module 200, a 5V power module 3000, a detection chip 4000, a CC2 signal identification module 1 501 and a CC2 signal identification module 2 502, wherein the power input terminal PWR of the input module 100 is connected to the output terminal of an external 12V power supply or a 24V power supply, and is used to receive a 12V or 24V DC power supply voltage and current provided by an external 12V power supply or a 24V power supply; the output terminal SC1 of the input module 100 is connected to the first input terminal of the output module 200 to provide the output module 200 with a control signal for identifying a DC charging gun CC2 signal; the input module 100 The output terminal SC2 of the input module 100 is connected to the second input terminal of the output module 200, and provides the output module 200 with a control signal for identifying the second CC2 signal of the DC charging gun; the output terminal SC3 of the input module 100 is connected to the third input terminal of the output module 200, and provides the output module 200 with a control signal for identifying the 12v or 24v power supply voltage; the input terminal 1CC2 of the input module 100 is connected to the output terminal of the CC2 signal identification module 1 501, and provides the input module 100 with a voltage signal for identifying the 1CC2 signal; the input terminal 2CC2 of the input module 100 is connected to the output terminal of the CC2 signal identification module 2 502, and provides the input module 100 with a voltage signal for identifying the 2CC2 signal.

[0032] It should be noted that the resistor RC and its resistance value in the CC2 signal identification module 1 501 and the CC2 signal identification module 2 502 need to be selected as 1kΩ with an accuracy of ±3% according to the provisions of the national standard GB / T 18487.1-2023 "Electric Vehicle Conductive Charging System Part 1: General Requirements".

[0033] The power input terminal VDD of the output module 200 is connected to the 1-pin of the 5V power module 300, so as to receive the voltage and current of the 5V DC power supply; the output terminal Wake of the input module 100 is connected to the enable input terminal EN of the 5V power module 300, so as to provide a wake-up signal to the 5V power module 300, so as to wake up the dormant BMS and put it into normal working state;

[0034] The output terminal VT of the output module 200 is connected to the detection input terminal TCC2 of the detection chip 400, and provides the detection chip 400 and the BMS software stored therein with 1CC2 plug-in signal and 2CC2 plug-in signal. The output terminal VT has four signal states of output: no charging gun inserted, only charging gun 1 inserted, only charging gun 2 inserted, and both charging gun 1 and charging gun 2 inserted. The output terminal VP of the output module 200 is connected to the detection input terminal TP of the detection chip 400, and provides the detection chip 400 and the BMS software stored therein with 12v / 24v power supply voltage signal. The output terminal VP has two signal states: power supply connected, no power supply connected. The input terminal 2 of the 5v power supply module 300 is connected to the output terminal of the external 12v / 24v power supply, and is used to receive the 12v / 24v DC power supply voltage and current provided by the external 12v / 24v power supply; the power supply input terminal Vdd of the detection chip 400 is connected to the output terminal of the 5v power supply module 300, and is used to receive the voltage and current of the 5v DC power supply.

[0035] It should be noted that the 5V power supply module 300 provides the voltage and current of the 5V DC power supply to the output module 200 and the detection chip 400 at the same time.

[0036] It should be noted that the detection chip 400 is used to pre-store the two signal states of the output terminal VP and the charging gun access state, and to set and store the correspondence between the signal state of the output terminal VP and the charging gun access state; in actual work, the BMS software determines the access state of charging gun one or charging gun two according to the stored correspondence based on the two signal states of the output terminal VP currently received.

[0037] It should be noted that the present invention only applies the 5V DC power supply output by the 5V power supply module 300, and requires the output current to be greater than 1A and the output voltage accuracy to be ±1%.

[0038] In terms of specific implementation, the detection chip 400 can use the currently commonly used microprocessor (MCU chip) brand, series and model, such as the MC9S12XE series chips (such as MC9S12XEP100) produced by NXP, or the S32K series chips (such as S32K244, S32K144, etc.) produced by NXP; if it is necessary to use MCU chips produced by other companies, their performance parameters can be selected by referring to the aforementioned chip series.

[0039] It should be noted that the present invention only applies the detection chip 400 to meet the collection of analog or level signals and store embedded BMS software and realize logical judgment.

[0040] See also Figure 1, for the dual DC charging gun CC2 signal wake-up and detection circuit provided by the present invention, the specific working principle is as follows:

[0041] When there is an external 12v / 24v power input and no charging gun is inserted, for the BMS in the dormant state, the input terminals 1CC2 and 2CC2 of the input module are high level, and their voltage is equal to the 12v / 24v power supply voltage; the output terminal Wake of the input module is low level, so that the 1st pin of the 5v power supply module has no 5v power output, then the input terminal VDD of the output module and the input terminal Vdd of the detection chip 400 have no 5v power input, so the dormant BMS will not be awakened, and will not enter the DC charging mode; at this time, the output terminal SC3 of the input module is low level, because the input terminal VDD of the output module has no 5v power input, so the output terminal VP of the output module is low level 0v; the output terminals SC1 and SC2 of the input module are all in high impedance state, then the output terminal VT of the output module is low level 0v. Since the BMS is not awakened, the output terminal LK of the detection chip 400 has no self-locking control signal output, and the 2nd pin of the enabling self-locking module 500 has no self-locking enable signal output.

[0042] It should be noted that BMS wake-up refers to providing a 5V power supply to the detection chip, and BMS sleep refers to disconnecting the 5V power supply to the detection chip.

[0043] When there is an external 12v / 24v power input and no charging gun is inserted, for the BMS in the awake state (awakened by other Wake signals other than the output terminal), pin 1 of the 5v power module has a 5v power output, and the input terminal VDD of the output module and the input terminal Vdd of the detection chip 400 also have a 5v power input, the output terminal VT of the output module is a high level of 5v, and the output terminal VP of the output module is a high level of 4v, then the BMS determines that there is an external power input but no charging gun is inserted, and will not enter the DC charging mode.

[0044] It should be noted that the BMS in sleep mode can be awakened by multiple wake-up signals, including the wake-up signal of the output terminal Wake. In addition to being connected to the wake-up signal from the input module output terminal Wake, the enable input terminal EN of the 5v power module 300 is also connected to other hardware modules of the BMS to receive wake-up signals. Even if there is no wake-up signal from the output terminal Wake, the 5v power module 300 will be awakened by other wake-up signals and output 5v power at its pin 1, and input 5v power to the input terminal Vdd of the detection chip 400.

[0045] It should be noted that when there is an external 12v / 24v power input, as long as a charging gun is inserted, the output terminal Wake of the input module will become a high level, which can wake up the BMS.

[0046] For a BMS in a dormant state, it can be awakened and determine whether charging gun 1 and / or charging gun 2 is inserted in the following ways:

[0047] When only a charging gun is inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has a 5v power input, thereby waking up the BMS; once the charging gun is inserted, the output terminal SC1 of the input module is low level 0v, the output terminal SC2 is high impedance, and the output terminal VT of the output module changes from low level 0v to high level 3.33v. At this time, the BMS software determines that a charging gun is inserted, and the BMS immediately enters the DC charging mode;

[0048] When only the second charging gun is inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has a 5v power input, thereby waking up the BMS; the insertion of the second charging gun makes the output terminal SC1 of the input module high impedance and the output terminal SC2 low level 0v, and the output terminal VT of the output module changes from low level 0v to high level 2.5v. At this time, the BMS software determines that the second charging gun is inserted, and the BMS immediately enters the DC charging mode;

[0049] When both charging gun 1 and charging gun 2 are inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has 5v power input, thereby waking up the BMS; when both charging gun 1 and charging gun 2 are inserted, when the output terminals SC1 and SC2 of the input module are both low level 0v, and the output terminal VT of the output module changes from low level 0v to high level 2v, the BMS software determines that both charging gun 1 and charging gun 2 are inserted, and the BMS immediately enters the DC charging mode;

[0050] Among them, after the BMS software determines that charging gun 1 and / or charging gun 2 is inserted, the output terminal LK of the detection chip 400 is controlled to output a power self-locking signal, and the 2nd foot of the self-locking module is enabled to output a wake-up signal, and the 5v power supply module is controlled to maintain 5v power output, so that the BMS remains in a wake-up state.

[0051] For a BMS in an awakened state (awakened by a wake-up signal other than the output terminal Wake), the insertion of charging gun 1 and / or charging gun 2 is determined in the following manner, and the BMS enters a DC charging mode:

[0052] When the output terminal VP of the output module is at a high level of 4v and the output terminal VT of the output module is at a high level of 3.33v, the BMS software determines that a charging gun is inserted, and the BMS immediately enters the DC charging mode.

[0053] When the output terminal VP of the output module is at a high level of 4v and the output terminal VT of the output module is at a high level of 2.5v, the BMS software determines that a second charging gun is inserted, and the BMS immediately enters the DC charging mode.

[0054] When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 2v, the BMS software determines that both charging gun 1 and charging gun 2 are inserted, and the BMS immediately enters the DC charging mode.

[0055] Among them, when the charging gun 1 or the charging gun 2 is unplugged, the BMS will not exit the DC charging mode, and since the output terminal Wake of the input module maintains a high level, the BMS will not enter the sleep state.

[0056] When both charging gun 1 and charging gun 2 are unplugged, the BMS exits the DC charging mode. If there is other wake-up signal, the BMS will not enter the sleep state. If there is no other wake-up signal, the output terminal Wake of the input module is at a low level, and the BMS enters the sleep state.

[0057] In the present invention, for specific implementation, see Figure 2, the input module 100 includes resistors R1~R10, R11, R13, R16, voltage regulator tubes Z1~Z6, switch tubes Q1~Q5 and diodes D1~D2, wherein: the first foot of the resistor R1 is used as the 12v / 24v power input terminal PWR of the input module 100, connected to the output terminal of the external 12v / 24v power supply, and used to receive the 12v / 24v DC power supply voltage and current provided by the external power supply; the first foot of the resistor R1 is also connected to the first feet of the resistors R9, R3, R5 and R7 respectively; the second foot of the resistor R1 is connected to the input terminal 1CC2 of the input module 100. When the charging gun 1 is inserted, the voltage of the input terminal 1CC2 of the first foot changes from a high level to a low level. Low level; the second pin of the resistor R1 is also connected to the positive and negative electrodes of the voltage regulator tube Z3 and the first pin of the resistor R2; the anode of the voltage regulator tube Z3 is connected to the cathode of the voltage regulator tube Z4; the anode of the voltage regulator tube Z4 is connected to the ground terminal; the second pin of the resistor R2 is connected to the gate G of the switch tube Q1; the source S of the switch tube Q1 is connected to the second pin of the resistor R3; the drain D of the switch tube Q1 is connected to the control terminal V1, and the control terminal V1 controls the conduction and cutoff of the switch tube Q2; the drain D of the switch tube Q1 is also connected to the first pin of the resistor R4, the gate G of the switch tube Q2, and the first pin of the resistor R11; the second pin of the resistor R4 is connected to the ground terminal; the second pin of the resistor R11 is respectively connected to the cathode of the voltage regulator tube Z5 and the anode of the diode D1; the voltage regulator tube Z5 The anode of the switch tube Q2 is connected to the ground terminal; the cathode of the diode D1 is respectively connected to the cathode of the diode D2 and the first pin of the resistor R16; the drain D of the switch tube Q2 is connected to the output terminal SC1 of the input module 100, and is used to control the signal level change of the output terminal VT of the output module 200, indicating whether the charging gun 1 is inserted or whether the charging gun 1 and the charging gun 2 are both inserted; the source S of the switch tube Q2 is connected to the ground terminal; the second pin of the resistor R9 is connected to the control terminal P, and the control terminal P controls the conduction and cutoff of the switch tube Q5; the second pin of the resistor R9 is also connected to the first pin of the resistor R10 and the gate G of the switch tube Q5; the second pin of the resistor R10 is connected to the ground terminal; the source S of the switch tube Q3 is connected to the second pin of the resistor R7; the switch tube The gate G of Q3 is connected to the second pin of the resistor R6; the drain D of the switch tube Q3 is connected to the control terminal V2, and the control terminal V2 controls the conduction and cutoff of the switch tube Q4; the drain D of the switch tube Q3 is also connected to the first pin of the resistor R8, the gate G of the switch tube Q4, and the first pin of the resistor R13, and the second pin of the resistor R13 is respectively connected to the cathode of the voltage regulator tube Z6 and the anode of the diode D2; the drain D of the switch tube Q4 is connected to the output terminal SC2 of the input module 100, which is used to control the signal level change of the output terminal VT of the output module 200, indicating whether the charging gun 2 is inserted or whether the charging gun 1 and the charging gun 2 are both inserted; the source S of the switch tube Q4 is connected to the ground terminal; the source S of the switch tube Q5 is connected to the ground terminal;The drain D of the switch tube Q5 is connected to the output terminal SC3 of the input module 100, and is used to control the signal level change of the output terminals VT and VP of the output module 200, indicating whether the 12v / 24v power supply is connected to the input module 100 and whether the 5v power supply is connected to the output module 200; the second pin of the resistor R6 is connected to the input terminal 2CC2 of the input module 100, and when the charging gun 2 is inserted, the voltage of the input terminal 2CC2 changes from a high level to a low level; the second pin of the resistor R6 is also connected to the cathode of the voltage regulator tube Z1 and the second pin of the resistor R5 respectively; the anode of the voltage regulator tube Z1 is connected to the cathode of the voltage regulator tube Z2; the anode of the voltage regulator tube Z2 is connected to the ground terminal. ;

[0058] In the present invention, in specific implementation, the detection working principle of the input module 100 is as follows:

[0059] 1. No 12v / 24v power supply voltage access

[0060] The power input terminal PWR of the input module 100 is pulled down to a low level of 0v by the resistors R9 and R10, so that the control terminals M1 and M2 of the input module 100 are at a low level, and the switch tubes Q1 and Q3 are turned off; the control terminal P, the control terminal V1 and the control terminal V2 of the input module 100 are pulled down to a low level of 0v by the resistors R10, R4 and R8 respectively, so that the switch tubes Q2, Q4 and Q5 are all turned off. At this time, the output terminals SC1, SC2 and SC3 of the input module 100 are all in high impedance state, and the output terminal Wake of the input module 100 is at a low level, which will not wake up the dormant BMS.

[0061] 2. 12v / 24v voltage access

[0062] When the voltage of the power input terminal PWR of the input module 100 is equal to the 12v / 24v power supply voltage, after the voltage is divided by the resistors R9 and R10, the voltage of the control terminal P becomes high level, so that the switch tube Q5 is turned on, thereby making the output terminal SC3 become low level. It should be noted that the normal voltage range of the 12v power supply is 9~16v, and the normal voltage range of the 24v power supply is 18~32v.

[0063] 1. When neither the charging gun 1 nor the charging gun 2 is plugged in

[0064] For a BMS in a dormant state, the voltage of the control terminals M1 and M2 is equal to the 12v / 24v power supply voltage, so that the switch tubes Q1 and Q3 are turned off, thereby turning off the switch tubes Q2 and Q4. At this time, the output terminals SC1 and SC2 are both in a high impedance state, the output terminal Wake of the input module 100 is a low level 0v, the 5v DC power supply module has no 5v power output, the output module 200 and the detection chip 400 have no 5v power input, and the dormant BMS will not be awakened, nor will the BMS enter a DC charging mode; at this time, the output terminal VP of the output module 200 is pulled to a low level 0v by the resistor R26, and the output terminal VT of the output module 200 is pulled to a low level 0v by the resistor R24.

[0065] 2. When only the charging gun is inserted

[0066] After the 12v / 24v power supply voltage is divided by the resistor R1 and the resistor RC in the CC2 signal identification module 501, the voltage of the input terminal 1CC2 of the pin 1 becomes a low level, and its voltage value is equal to half of the 12v / 24v power supply voltage, which is also the voltage of the control terminal M1. For example, when the current power supply voltage is 12v, the voltage of the input terminal 1CC2 of the pin 1 is equal to 6v, and the voltage of the control terminal M2 is also equal to 6v.

[0067] It should be noted that the resistance value of the resistor RC of the CC2 signal identification module 1 501 is 1 kΩ.

[0068] Since the voltage of the power input terminal PWR of the input module 100 is equal to the 12v / 24v power supply voltage and the control terminal M1 is at a low level, the voltage difference between the gate G and the source S of the switch tube Q1 is greater than the gate-source turn-on voltage, so the switch tube Q1 is turned on, making the control terminal V1 40% of the power supply voltage, thereby turning on the switch tube Q2, and at this time the output terminal SC1 becomes a low level 0v.

[0069] Since the second charging gun is not inserted, the output terminal SC2 is in a high impedance state.

[0070] Since the control terminal V1 is 40% of the power supply voltage, if the voltage is greater than the voltage regulation value 6.2v of the voltage regulator tube Z5, the output terminal Wake is a high level 6.2v; if the voltage is not greater than the voltage regulation value 6.2v of the voltage regulator tube Z5, the output terminal Wake is a high level, and its voltage value is equal to 40% of the power supply voltage; the high level signal of the output terminal Wake can make the 5v power supply module output 5v power supply, provide 5v DC power supply for the detection chip 400, and thus wake up the dormant BMS;

[0071] It should be noted that the control terminal V1 is 40% of the power supply voltage and can be set according to the turn-on voltage threshold of the MOSFET in actual application;

[0072] It should be noted that after the BMS is awakened, the enabling self-locking module 500 outputs an enabling signal to continue waking up the BMS. Even if the charging gun is unplugged and the conditions for the BMS to enter sleep are not met, the BMS will not enter sleep due to the loss of the charging wake-up signal.

[0073] It should be noted that in the application example given in the present invention, the switch tubes Q1 to Q6 are all selected from MOSFETs produced by LRC, model S-LN76042DT3WG, with a typical gate-source turn-on voltage of 2.0v, a minimum turn-on voltage of 1.5v, and a maximum turn-on voltage of 2.5v.

[0074] 3. When only charging gun 2 is inserted, the resistor RC of the CC2 signal recognition module 2 502 divides the 12v / 24v power supply voltage through the resistor R5, so that the voltage of the 2-pin input terminal 2CC2 becomes a low level, and its voltage value is equal to half of the 12v / 24v power supply voltage, that is, the voltage of the control terminal M2.

[0075] It should be noted that the resistance value of the resistor RC of the CC2 signal identification module 2 502 is 1 kΩ.

[0076] Since the voltage of the power input terminal PWR of the input module 100 is equal to the 12v / 24v power supply voltage and the control terminal M2 is at a low level, the voltage difference between the gate G and the source S of the switch tube Q3 is greater than the gate-source turn-on voltage, so the switch tube Q3 is turned on, making the control terminal V2 40% of the power supply voltage, thereby turning on the switch tube Q4, and at this time the output terminal SC2 becomes a low level 0v.

[0077] Since no charging gun is inserted, the output terminal SC1 is in a high impedance state.

[0078] Since the control terminal V2 is 40% of the power supply voltage, if the voltage is greater than the voltage regulation value 6.2v of the voltage regulator tube Z6, the output terminal Wake is a high level 6.2v; if the voltage is not greater than the voltage regulation value 6.2v of the voltage regulator tube Z6, the output terminal Wake is a high level, and its voltage value is equal to 40% of the power supply voltage; the high level signal of the output terminal Wake can make the 5v power supply module output 5v power supply, provide 5v DC power supply for the detection chip 400, and thus wake up the dormant BMS;

[0079] 4. When both charging gun 1 and charging gun 2 are inserted, the input terminals 1CC2 and 2CC2 are both at a low level, so that the switch tubes Q1 and Q2 are turned on, and the switch tubes Q3 and Q4 are turned on, then the output terminals SC1 and SC2 are both at a low level, and the output terminal Wake is at a high level of 6.2v or 40% of the power supply voltage.

[0080] In the present invention, the specific implementation is as follows: Figure 2 The output module 200 includes: resistors R20-R26, and a switch tube Q6, wherein the first pin of the resistor R20 is used as the third input terminal of the output module 200, connected to the output terminal SC3 of the input module 100, and controlled by the signal of the output terminal SC3, the signal states of the output terminals VP and VT of the output module 200 will change accordingly; the first pin of the resistor R20 is also connected to the gate G of the switch tube Q6; the second pin of the resistor R20 is used as the power input terminal VDD of the output module 200, connected to the power supply 1 pin of the 5V power module 300, for Receive the voltage and current of the 5V DC power supply; the second pin of the resistor R20 is also connected to the drain D of the switch tube Q6; the source of the switch tube Q6 is respectively connected to the first pin of the resistor R23 and the first pin of the resistor R25; the second pin of the resistor R23 is used as the output terminal VT of the output module 200, connected to the input terminal TCC2 of the detection chip 400, and is used for the BMS software embedded in the detection chip 400 to judge the insertion status of the charging gun 1 or the charging gun 2 according to the signal status of TCC2; the second pin of the resistor R23 is also connected to the second pin of the resistor R21 and the first pin of the resistor R22. The first pin of the resistor R21 is used as the first input terminal of the output module 200, connected to the output terminal SC1 of the input module 100, and the signal state of the output terminal VT of the output module 200 will change accordingly under the control of the signal of the output terminal SC1; the second pin of the resistor R22 is used as the second input terminal of the output module 200, connected to the output terminal SC2 of the input module 100, and the signal state of the output terminal VT of the output module 200 will change accordingly under the control of the signal of the output terminal SC2; the resistor R24 ​​is used as the second input terminal of the output module 200, connected to the output terminal SC2 of the input module 100, and the signal state of the output terminal VT of the output module 200 will change accordingly under the control of the signal of the output terminal SC2; The second pin of the resistor R25 is connected to the ground terminal; the second pin of the resistor R25 is connected to the power detection input terminal TP of the detection chip 400 as the output terminal VP of the output module 200, and is used for the BMS software embedded in the detection chip 400 to determine whether there is a power supply voltage input according to the signal state of the input terminal TP; the second pin of the resistor R25 is also connected to the first pin of the resistor R26; the second pin of the resistor R26 is connected to the ground terminal; the power supply 1 pin of the 5v power supply module 300 is connected to the power input terminal Vdd of the detection chip 400, providing a 5v DC power supply for the detection chip 400.

[0081] In the present invention, in specific implementation, the detection working principle of the output module 200 is as follows:

[0082] 1. No 12v / 24v power supply voltage access

[0083] The output terminals SC1, SC2, and SC3 of the input module 100 are all in high impedance state, and the switch tube Q6 of the output module 200 is turned off, so that the output terminal VT of the output module 200 is pulled to a low level of 0v by the resistor R24, and the output terminal VP of the output module 200 is pulled to a low level of 0v by the resistor R26.

[0084] 2. There is 12v / 24v power supply voltage access

[0085] Regardless of whether a charging gun is inserted, the output terminal SC3 of the input module 100 is at a low level, so that the switch tubes Q5 and Q6 are turned on. The 5V power supply voltage VDD of the output module 200 is divided by the resistors R16 and R17 so that the output terminal VP of the output module 200 is at a high level of 4V.

[0086] 1. When neither charging gun 1 nor charging gun 2 is plugged in, the output terminals SC1 and SC2 of the input module 100 are in high impedance state, and the output terminal Wake of the input module 100 is at a low level: For a BMS in a dormant state, the power input terminal VDD of the output module 200 does not have a 5v power input, the output terminal VT of the output module 200 is pulled to a low level of 0v by the resistor R24, and the output terminal VP of the output module 200 is pulled to a low level of 0v by the resistor R26. For a BMS in an awakened state (awakened by other wake-up signals), the power input terminal VDD of the output module 200 has a 5v power input, the output terminal VP of the output module is at a high level of 4v after the voltage is divided by the resistors R25 and R26, and the output terminal VT of the output module is at a high level of 5v after the voltage is divided by the resistors R23 and R24. At this time, the BMS software determines that neither charging gun 1 nor charging gun 2 is plugged in.

[0087] It should be noted that the BMS software is stored in the detection chip 400 .

[0088] 2. When charging gun 1 is inserted, the voltage of input terminal 1CC2 of pin 1 of the input module 100 becomes low level, making the output terminal SC1 of the input module 100 low level 0v; since charging gun 2 is not inserted, the output terminal SC2 of the input module 100 is in high impedance state; the output terminal Wake of the input module 100 is high level, so that the power input terminal VDD of the output module 200 has 5v power input, and the 5v power supply voltage is divided by resistors R25 and R26, so that the output terminal VP of the output module 200 is high level 4v; the 5v power supply voltage is divided by resistors R23, R21 and R24, so that the output terminal VT of the output module 200 is high level 3.33v. At this time, the BMS software determines that only charging gun 1 is inserted.

[0089] 3. When only charging gun 2 is inserted, the voltage of the 2-pin input terminal 2CC2 of the input module 100 becomes low level, making the output terminal SC2 of the input module 100 low level 0v; since charging gun 1 is not inserted, the output terminal SC1 of the input module 100 is in high impedance state; the output terminal Wake of the input module 100 is high level, so that the power input terminal VDD of the output module 200 has 5v power input; after the 5v power supply voltage is divided by resistors R25 and R26, the output terminal VP of the output module 200 is high level 4v; after the 5v power supply voltage is divided by resistors R23, R22 and R24, the output terminal VT of the output module 200 is high level 2.5v. At this time, the BMS software determines that only charging gun 2 is inserted.

[0090] 4. When both charging gun 1 and charging gun 2 are inserted, the input terminals 1CC2 and 2CC2 of the input module 100 are both low level, so that the output terminals SC1 and SC2 of the input module 100 are both low level, and the output terminal Wake of the input module 100 is high level, so that the power input terminal VDD of the output module 200 has 5v power input; after the 5v power supply voltage is divided by resistors R25 and R26, the output terminal VP of the output module 200 is high level 4v; after the 5v power supply voltage is divided by resistors R23, R21, R22 and R24, the output terminal VT of the output module 200 is high level 2v. At this time, the BMS software determines that both charging gun 1 and charging gun 2 are inserted.

[0091] The circuit structure of the present invention is simple, and the components used are all universal models, which can be implemented by domestic devices; the present invention adopts a detection chip (i.e., a single-chip microcomputer) whose detection input port has four signal state outputs, which can detect the CC2 signals of two charging guns, saving precious port resources of the detection chip; directly using the BMS external input power supply, that is, compatible with the vehicle-mounted 12v / 24v battery, and does not require the BMS to perform power supply voltage conversion.

[0092] A third aspect of an embodiment of the present invention provides a battery management system, which uses the DC dual charging gun CC2 signal detection method to perform DC dual charging gun CC2 signal detection, or includes a DC dual charging gun CC2 signal detection circuit. For specific detection methods and detection circuit structures, please refer to the aforementioned content.

[0093] A fourth aspect of an embodiment of the present invention provides a vehicle, comprising the battery management system; or provided with the DC dual charging gun CC2 signal detection circuit.

[0094] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0095] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. DC dual charging gun CC2 signal detection circuit, characterized in that: It includes an input module, an output module, a 5V power module, a detection chip, a CC2 signal identification module 1 and a CC2 signal identification module 2; the output terminals SC1, SC2 and SC3 of the input module are connected to the 1st, 2nd and 3rd pins of the output module, the output terminals VT and VP of the output module are connected to the input terminals TCC2 and TP of the detection chip, the output terminal LK of the detection chip is connected to the 1st pin of the self-locking enable module, the 2nd pin of the self-locking enable module is connected to the enable input terminal EN of the 5V power module, the 1st pin of the 5V power module is connected to the power input terminal VDD of the output module and the power input terminal Vdd of the detection chip, the output terminals of the CC2 signal identification module 1 and the CC2 signal identification module 2 are respectively connected to the input terminals 1CC2 and 2CC2 of the input module; the output terminal Wake of the output module is connected to the enable input terminal EN of the 5V power module, the 2nd pin of the 5V power module and the power input terminal PWR of the input module are connected to the external 12V / 24V power supply.

2. According to claim 1, the DC dual charging gun CC2 signal detection circuit is characterized in that: The input module includes resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R13, R16, voltage regulator tubes Z1, Z2, Z3, Z4, Z5, Z6, diodes D1, D2, and switch tubes Q1, Q2, Q3, Q4, Q5; pin 1 of resistor R1 is connected to the output end of an external 12v / 24v power supply and pin 1 of resistors R9, R3, R5, and R7; pin 2 of resistor R1 is connected to the input end 1CC2 of the input module, the cathode of voltage regulator tube Z3, and pin 1 of resistor R2; the anode of voltage regulator tube Z3 is connected to the stabilizing tube Z1; the cathode ... The cathode of the voltage regulator tube Z4 and the anode of the voltage regulator tube Z4 are connected to the ground terminal; the 2nd pin of the resistor R2 is connected to the gate G of the switch tube Q1; the source S of the switch tube Q1 is connected to the 2nd pin of the resistor R3, the drain D of the switch tube Q1 is connected to the control terminal V1, the 1st pin of the resistor R4, the gate G of the switch tube Q2, and the 1st pin of the resistor R11; the 2nd pin of the resistor R4 is connected to the ground terminal; the 2nd pin of the resistor R11 is respectively connected to the cathode of the voltage regulator tube Z5 and the anode of the diode D1; the anode of the voltage regulator tube Z5 is connected to the ground terminal; the cathode of the diode D1 is respectively connected to the cathode of the diode D2 and the 1st pin of the resistor R16, and the resistor R Pin 2 of 16 is grounded; the drain D of the switch tube Q2 is connected to the output terminal SC1 of the input module, and the source S of the switch tube Q2 is connected to the ground terminal; the pin 2 of the resistor R9 is connected to the control terminal P, the pin 1 of the resistor R10, and the gate G of the switch tube Q5; the pin 2 of the resistor R10 is connected to the ground terminal; the source S of the switch tube Q3 is connected to the pin 2 of the resistor R7; the gate G of the switch tube Q3 is connected to the pin 2 of the resistor R6; the drain D of the switch tube Q3 is connected to the control terminal V2, the pin 1 of the resistor R8, the gate G of the switch tube Q4, and the pin 1 of the resistor R13, and the pins 2 of the resistor R13 are respectively connected to the pins 1 and 2 of the voltage regulator tube Z6. cathode, anode of diode D2; drain D of switch tube Q4 is connected to output terminal SC2 of input module; source S of switch tube Q4 is connected to ground; source S of switch tube Q5 is connected to ground; drain D of switch tube Q5 is connected to output terminal SC3 of input module; pin 2 of resistor R6 is connected to input terminal 2CC2 of input module; pin 2 of resistor R6 is also connected to cathode of voltage regulator tube Z1 and pin 2 of resistor R5 respectively; anode of voltage regulator tube Z1 is connected to cathode of voltage regulator tube Z2; anode of voltage regulator tube Z2 is connected to ground; cathode of diode D2 is connected to output terminal Wake of output module.

3. According to claim 1, the DC dual charging gun CC2 signal detection circuit is characterized in that: The output module includes resistors R20, R21, R22, R23, R24, R25, R26, and a switch Q6; pin 1 of the resistor R20 is connected to the output terminal SC3 of the input module and the gate G of the switch Q6, and pin 2 of the resistor R20 is connected to the drain D of the switch Q6 and the power input terminal VDD of the output module; pin 1 of the resistor R21 is connected to the output terminal SC1 of the input module, pin 2 of the resistor R21 is connected to the output terminal VT of the output module, pin 1 of the resistor R22 is connected to the output terminal SC2 of the input module, pin 2 of the resistor R22 is connected to the output terminal VT of the output module and pin 1 of the resistor R24, the source S of the switch Q6 is connected to pin 1 of the resistor R23 and pin 1 of the resistor R25, pin 2 of the resistor R23 is connected to the output terminal VT of the output module, pin 2 of the resistor R25 is connected to the output terminal VP of the output module, pin 1 of the resistor R26 is connected to the output terminal VP of the output module, and pin 2 of the resistor R26 and pin 2 of the resistor R24 ​​are grounded.

4. According to claim 1, the DC dual charging gun CC2 signal detection circuit is characterized in that: The CC2 signal identification module 1 and the CC2 signal identification module 2 respectively include a resistor RC, one end of the two resistors RC is connected to the input ends 1CC2 and 2CC2 of the input module, and the other ends of the two resistors RC are connected to the ground end.

5. DC dual charging gun CC2 signal detection method, characterized in that: Based on the DC dual charging gun CC2 signal detection circuit as described in any one of claims 1 to 4, the output signals of the output terminals VT and VP of the output module are used to judge the 2v / 24v power supply voltage access status and the access status of charging gun one and charging gun two. According to the 2v / 24v power supply voltage access status and the access status of charging gun one and charging gun two, the BMS is not woken up, or the dormant BMS is woken up, or the awakened BMS is put into DC charging mode.

6. According to claim 5, the DC dual charging gun CC2 signal detection method is characterized in that: The output terminal VT has four signal output states, including no charging gun inserted, only charging gun 1 inserted, only charging gun 2 inserted, and both charging gun 1 and charging gun 2 inserted; the output terminal VP has two power signal states, including power connected and no power connected; the detection chip pre-stores the two power signal states of the output terminal VP and the four charging gun connection states output by the output terminal VT, and sets and stores the corresponding relationship between the power signal state of the output terminal VP and the charging gun connection state of the output terminal VT; the BMS software determines the connection state of charging gun 1 or charging gun 2 according to the two power signal states of the output terminal currently received and the stored corresponding relationship.

7. According to claim 6, the DC dual charging gun CC2 signal detection method is characterized in that: When there is no 12v / 24v power supply voltage connected, the output terminals SC1, SC2, and SC3 of the input module are all in high-impedance state. Correspondingly, the output terminals VT and VP of the output module are both low level 0v, and there is no 5v power output at pin 1 of the 5v power supply module. The output terminal Wake of the input module is low level and does not wake up the BMS; the output terminal LK of the detection chip has no self-locking control signal output, and there is no self-locking enable signal output at pin 2 of the self-locking enable module.

8. The method for detecting CC2 signal of a DC dual charging gun according to claim 7, characterized in that: When a 12v / 24v power supply voltage is connected, the following methods are used to determine whether to wake up the dormant BMS and make the awakened BMS enter the DC charging mode: When there is an external 12v / 24v power input and no charging gun is inserted, for the BMS in the dormant state, the input terminals 1CC2 and 2CC2 of the input module are high level, and their voltage is equal to the 12v / 24v power supply voltage; the output terminal Wake of the input module is low level, so that there is no 5v power output at pin 1 of the 5v power supply module, then the input terminal VDD of the output module and the input terminal Vdd of the detection chip have no 5v power input, and the dormant BMS will not be awakened, and will not enter the DC charging mode; at this time, the output terminal SC3 of the input module is low level, and the output terminal VP of the output module is low level 0v; the output terminals SC1 and SC2 of the input module are all in high impedance state, then the output terminal VT of the output module is low level 0v; the output terminal LK of the detection chip has no self-locking control signal output, and the pin 2 of the enabling self-locking module has no self-locking enable signal output; When there is an external 12v / 24v power input and no charging gun is inserted, for the BMS that is awakened by other Wake signals other than the output end, the 1st pin of the 5v power module has a 5v power output, the input end VDD of the output module and the input end Vdd of the detection chip have a 5v power input, the output end VT of the output module is a high level of 5v, and the output end VP of the output module is a high level of 4v, then the BMS determines that there is an external power input but no charging gun is inserted, and will not enter the DC charging mode; When there is an external 12v / 24v power input and a charging gun is inserted, the output terminal Wake of the input module becomes high level, and the BMS is woken up and the charging gun 1 and / or the charging gun is inserted in the following way: When only a charging gun is inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has a 5v power input, thereby waking up the BMS; once the charging gun is inserted, the output terminal SC1 of the input module is low level 0v, and the output terminal SC2 is high impedance. When the output terminal VT of the output module changes from low level 0v to high level 3.33v, the BMS software determines that a charging gun is inserted, and the BMS immediately enters the DC charging mode; When only the second charging gun is inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has a 5v power input, thereby waking up the BMS; the insertion of the second charging gun makes the output terminal SC1 of the input module high impedance and the output terminal SC2 low level 0v, and the output terminal VT of the output module changes from low level 0v to high level 2.5v. At this time, the BMS software determines that the second charging gun is inserted, and the BMS immediately enters the DC charging mode; When both charging gun 1 and charging gun 2 are inserted, the output terminal Wake of the input module is high level, so that the input terminal Vdd of the detection chip has 5v power input, thereby waking up the BMS; when both charging gun 1 and charging gun 2 are inserted, the output terminals SC1 and SC2 of the input module are both low level 0v, and the output terminal VT of the output module changes from low level 0v to high level 2v. At this time, the BMS software determines that both charging gun 1 and charging gun 2 are inserted, and the BMS immediately enters the DC charging mode; In particular, after the BMS software determines that charging gun 1 and / or charging gun 2 are inserted, it controls the output terminal LK of the detection chip to output a power self-locking signal, enables the 2nd foot of the self-locking module to output a wake-up signal, controls the 5v power module to maintain 5v power output, and keeps the BMS in a wake-up state; For a BMS that is awakened by a Wake signal other than the output terminal, the insertion of the charging gun 1 and / or the charging gun 2 is determined in the following manner, and the BMS enters the DC charging mode: When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 3.33v, the BMS software determines that a charging gun is inserted, and the BMS immediately enters the DC charging mode; When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 2.5v, the BMS software determines that a second charging gun is inserted, and the BMS immediately enters the DC charging mode; When the output terminal VP of the output module is at a high level of 4v, and the output terminal VT of the output module is at a high level of 2v, the BMS software determines that both charging gun 1 and charging gun 2 are plugged in, and the BMS immediately enters the DC charging mode; When charging gun 1 or charging gun 2 is unplugged, the BMS does not exit the DC charging mode, and since the output terminal Wake of the input module maintains a high level, the BMS will not enter the sleep state; when both charging gun 1 and charging gun 2 are unplugged, the BMS exits the DC charging mode, and if there is other wake-up signal, the BMS will not enter the sleep state; if there is no other wake-up signal, the output terminal Wake of the input module is a low level, and the BMS enters the sleep state.

9. A battery management system, characterized in that: The DC dual charging gun CC2 signal detection method according to any one of claims 5 to 8 is used to perform DC dual charging gun CC2 signal detection.

10. A vehicle, characterized in that It includes the battery management system described in claim 9; or is provided with the DC dual charging gun CC2 signal detection circuit described in one of claims 1-4.

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