Charging wake-up circuit of battery management system

Abstract

The utility model relates to the technical field of new energy automobiles, and discloses a battery management system charging wake-up circuit, which comprises a charging pile end, an MCU (Microprogrammed Control Unit), a CC1 control circuit, a CC2 control circuit, a power supply module and a level conversion circuit, and is characterized in that the charging pile end is respectively connected with the CC1 control circuit and the CC2 control circuit through a CC1 interface and a CC2 interface; the MCU is connected with the CC1 control circuit and the CC2 control circuit through a fast charge control port, and the power supply module is connected with the CC1 control circuit and the CC2 control circuit through the level conversion circuit. The battery management system is awakened through connection confirmation signals on the fast charging gun, the fast charging gun awakens the battery management system through two connection confirmation signals including a level signal and a resistance signal, the signals supply power to the battery management system, gun insertion awakening and autonomous dormancy functions are achieved, and the national standard is met; and the circuit has the advantages of low cost, simple circuit and easiness in implementation.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, specifically a battery management system charging wake-up circuit. Background Technology

[0002] New energy vehicles refer to vehicles that use non-traditional power sources, including electric vehicles and plug-in hybrid electric vehicles. Electric vehicles and plug-in hybrid electric vehicles use batteries as power sources. Batteries need to be charged to obtain energy. Charging is the process of storing electrical energy in the battery so that the vehicle can use it while driving.

[0003] A battery management system is an electronic system used to monitor and manage the performance of a battery pack. It can monitor the voltage of each battery cell in real time to ensure that each cell is within a safe operating range. It can also monitor the temperature of the battery to prevent overheating or low temperature from affecting performance and safety. In addition, it can track the current flowing into and out of the battery pack and control the charging and discharging process.

[0004] Currently, most electric vehicle electronic control systems, except for the battery management system (BMS), enter a sleep state during charging. After charging is complete, the BMS should also enter sleep mode to ensure the vehicle's energy efficiency. However, end-users typically do not unplug the charging gun promptly after charging. The wake-up signal on the charging gun remains connected to the BMS through the unplugged gun, preventing the BMS from entering sleep mode. Prolonged unplugging can lead to depletion of the vehicle's small batteries. Furthermore, the charger lacks a secure fixing device, making it difficult to securely fasten when connected to the car. This can cause the charger to become loose during charging, affecting charging efficiency and resulting in slower charging speeds or incomplete charging. Utility Model Content

[0005] The purpose of this utility model is to provide a battery management system charging wake-up circuit to solve the following technical problems: the battery management system is woken up by the connection confirmation signal on the fast charging gun. Both of these signals can wake up the power supply part of the battery management system for power supply to the battery management system. At the same time, the charger is fixed during the charging process to prevent loosening from affecting the charging effect.

[0006] The purpose of this utility model can be achieved through the following technical solution: a battery management system charging wake-up circuit, including a charging pile terminal, an MCU, a CC1 control circuit, a CC2 control circuit, a power supply module, and a level conversion circuit;

[0007] The charging pile terminal is connected to the CC1 control circuit and the CC2 control circuit via the CC1 interface and the CC2 interface, respectively;

[0008] The MCU is connected to the CC1 control circuit and the CC2 control circuit via a fast charging control port, and the power module is connected to the CC1 control circuit and the CC2 control circuit via the level conversion circuit.

[0009] As a preferred embodiment of this utility model: the CC1 control circuit includes resistor R16, resistor R18, transistor Q5, resistor R17, resistor R14, transistor Q4, resistor R15, and resistor R13.

[0010] One end of resistor R16 is connected to the MCU through the fast charging CC1 control port, and the other end is connected to resistor R18. The other end of resistor R18 is connected to GND, and the intersection of resistor R16 and resistor R18 is connected to the base of transistor Q5.

[0011] The collector of transistor Q5 is connected to the gate of transistor Q4 and one end of resistor R17. The other end of resistor R17 is connected to the emitter of transistor Q5, the source of transistor Q4, and one end of resistor R15, and connected to GND. The other end of resistor R15 is connected to resistor R13, and the other end of resistor R13 is connected to the CC1 interface.

[0012] The junction of the collector of transistor Q5, the gate of transistor Q4, and resistor R17 is connected to one end of resistor R14, the other end of resistor R14 is connected to the positive terminal of the power supply, and the junction of resistors R13 and R15 is connected to the drain of transistor Q4.

[0013] As a preferred embodiment of this utility model: the CC2 control circuit includes resistors R1, R2, R3, R4 and transistor Q1;

[0014] One end of resistor R1 is connected to the MCU through the fast charging CC2 control port, and the other end is connected to the gate of transistor Q1. The intersection of resistor R1 and MCU is connected to one end of resistors R2 and R3. The other end of resistor R2 is connected to the source of transistor Q1, and the other end of resistor R3 is connected to GND.

[0015] The junction of the gate of transistor Q1 and resistor R1 is connected to the positive terminal of the power supply. The drain of transistor Q1 is connected to one end of resistor R4, and the other end of resistor R4 is connected to the CC2 interface.

[0016] As a preferred embodiment of this utility model: the level conversion circuit includes resistors R5, R7, R8, R9, and R10, transistor Q2, transistor Q3, and capacitor C2;

[0017] One end of the resistor R5 is connected to the CC2 interface through D1, and the other end of the resistor R5 is connected to the positive terminal of the power supply. The intersection of the resistor R5 and the positive terminal of the power supply is connected to the gate of the transistor Q2.

[0018] The intersection of resistor R5 and the CC2 interface is connected to one end of resistor R7 and the drain of transistor Q3. The other end of resistor R7 is connected to the source of transistor Q2. The gate of transistor Q3 is connected to one end of resistor R8. The other end of resistor R8 is connected to the CC1 interface. The intersection of the gate of transistor Q3 and resistor R8 is connected to one end of resistor R10. The other end of resistor R10 is connected to the source of transistor Q3. The intersection of the source of transistor Q3 and resistor R10 is connected to GND.

[0019] The drain of transistor Q2 is connected to one end of resistor R9, the other end of resistor R9 is connected to the power supply module, the intersection of the drain of transistor Q2 and resistor R9 is connected to one end of capacitor C2, and the other end of capacitor C2 is connected to the intersection of the power supply module and resistor R9.

[0020] As a preferred embodiment of this utility model: the charging pile terminal includes resistor R6, resistor R11, resistor R12 and switch S1;

[0021] One end of resistor R6 is connected to the CC2 interface, and the other end of resistor R6 is connected to GND. One end of resistor R11 is connected to the positive terminal of the power supply, and the other end of resistor R11 is connected to one end of resistor R12. The other end of resistor R12 is connected to the CC1 interface. The intersection of resistor R12 and resistor R11 is connected to one end of switch S1, and the intersection of resistor R12 and the CC1 interface is connected to the other end of switch S1.

[0022] As a preferred embodiment of this utility model: the charging pile end further includes a charging gun and a fixing component fixed inside the charging gun, the fixing component including a button, a fixing rod and a spring;

[0023] All buttons are slidably connected inside the device. Pressing a button moves the fixing rod, and releasing the button resets the fixing rod due to the spring force. The reset of the fixing rod secures the charging gun.

[0024] As a preferred embodiment of this utility model, the MCU is an S32K314 microcontroller.

[0025] The beneficial effects of this utility model are:

[0026] (1) This utility model can effectively convert DC level signals into pulse signals with a specific duration through a conversion circuit. It not only realizes the function of plugging in the gun to wake up, but also allows the device to enter the sleep state autonomously, thereby achieving the effect of energy saving. In addition, the conversion circuit has the advantages of low cost, simple circuit structure and convenient and quick implementation.

[0027] (2) By pressing the button, the fixed rod can be moved so that the charging gun can be inserted into the charging port. When the button is released, the spring force can drive the fixed rod to reset. After the fixed rod is reset, the charging gun can be fixed to prevent the charger from becoming loose during the charging process, which would affect the charging efficiency and effect, and cause the charging speed to slow down or the charging to be incomplete. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a circuit diagram of the charging and wake-up function of this utility model;

[0030] Figure 2 This is a schematic diagram of the national standard DC charging control guide circuit of this utility model;

[0031] Figure 3 This is a perspective view of the present utility model;

[0032] Figure 4 This is a schematic diagram of the charging port in this utility model;

[0033] Figure 5 This is a schematic diagram of the charging gun in this utility model;

[0034] Figure 6 This is a schematic diagram of the fixing component in this utility model;

[0035] Figure 7 This is a schematic diagram of the movable rod in this utility model;

[0036] Figure 8 In this utility model Figure 7 Enlarged view of point A in the middle;

[0037] Figure 9 This is a schematic diagram of the trapezoidal block in this utility model.

[0038] Figure descriptions: 1. Vehicle body; 2. Fixing component; 11. Charging pile; 12. Charging cable; 13. Charging gun; 14. Charging port; 21. Button; 22. Lifting block; 23. Trapezoidal block; 24. Moving plate; 25. Moving rod; 26. Moving block; 27. Rotating plate; 28. Connecting plate; 29. ​​Fixing rod; 30. Spring; 31. Slider one; 32. Slider two. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0040] Please see Figure 1 As shown, this utility model is a charging wake-up circuit for a battery management system, including a charging pile terminal, an MCU, a CC1 control circuit, a CC2 control circuit, a power supply module, and a level conversion circuit. The charging pile terminal is connected to the CC1 control circuit and the CC2 control circuit through the CC1 interface and the CC2 interface, respectively. The MCU is connected to the CC1 control circuit and the CC2 control circuit through the fast charging control port. The power supply module is connected to the CC1 control circuit and the CC2 control circuit through the level conversion circuit. The MCU is an S32K314 microcontroller.

[0041] The CC1 control circuit includes resistors R16 and R18, transistor Q5, R17, R14, transistor Q4, R15, and R13. One end of resistor R16 is connected to the MCU via the fast-charging CC1 control port, and the other end is connected to resistor R18. The other end of resistor R18 is connected to GND. The intersection of resistors R16 and R18 is connected to the base of transistor Q5. The collector of transistor Q5 is connected to the gate of transistor Q4 and one end of resistor R17. The other end of resistor R17 is connected to the emitter of transistor Q5, the source of transistor Q4, and one end of resistor R15, and is connected to GND. The other end of resistor R15 is connected to resistor R13. The other end of resistor R13 is connected to the CC1 interface. The intersection of the collector of transistor Q5, the gate of transistor Q4, and resistor R17 is connected to one end of resistor R14. The other end of resistor R14 is connected to the positive power supply. The intersection of resistors R13 and R15 is connected to the drain of transistor Q4.

[0042] The CC1 signal from the charging pile 11 end is transmitted to resistors R8 and R13 through the charging gun 13. Pin 1 of resistor R13 is connected to pin 2 of resistor R15 and pin 3 of transistor Q5. Pin 1 of resistor R15 and pin 2 of transistor Q5 are connected to GND. Pin 1 of transistor Q5 is connected to pin 2 of resistor R14, pin 2 of resistor R17, and pin 3 of transistor Q5. Pin 1 of resistor R14 is connected to 12V. Resistor R17 is connected to GND. Pin 2 of transistor Q5 is connected to GND, and pin 1 is connected to pin 1 of resistor R16 and pin 2 of resistor R18. Pin 1 of resistor R18 is connected to GND. Pin 2 of resistor R16 is connected to the fast charging CC1 control interface of the MCU.

[0043] The CC2 control circuit includes resistors R1, R2, R3, R4, and transistor Q1. One end of resistor R1 is connected to the MCU through the fast charging CC2 control port, and the other end is connected to the gate of transistor Q1. The intersection of resistor R1 and the MCU is connected to one end of resistors R2 and R3. The other end of resistor R2 is connected to the source of transistor Q1. The other end of resistor R3 is connected to GND. The intersection of the gate of transistor Q1 and resistor R1 is connected to the positive power supply. The drain of transistor Q1 is connected to one end of resistor R4, and the other end of resistor R4 is connected to the CC2 interface.

[0044] The CC2 signal at the charging station is connected to pins 3 of D1 and D2 via the charging gun. Pin 1 of D2 is connected to pin 2 of resistor R4. The fast charging CC2 control port of the MCU is connected to pin 2 of resistor R3. Pin 1 of resistor R3 is connected to GND. Pin 2 of resistor R3 is connected to pins 1 of resistor R1 and R2. Pin 2 of resistor R1 is connected to 5V. Pin 2 of resistor R2 is connected to pin 1 of transistor Q1. Pin 2 of transistor Q1 is connected to 5V, and pin 3 of transistor Q1 is connected to pin 1 of resistor R4.

[0045] The level shifting circuit includes resistors R5, R7, R8, R9, and R10, transistors Q2 and Q3, and capacitor C2. One end of resistor R5 is connected to the CC2 interface via D1, and the other end of resistor R5 is connected to the positive power supply. The intersection of resistor R5 and the positive power supply is connected to the gate of transistor Q2. The intersection of resistor R5 and the CC2 interface is connected to one end of resistor R7 and the drain of transistor Q3. The other end of resistor R7 is connected to the source of transistor Q2, and the gate of transistor Q3 is connected to resistor R8. One end of resistor R8 is connected to the CC1 interface. The intersection of the gate of transistor Q3 and resistor R8 is connected to one end of resistor R10. The other end of resistor R10 is connected to the source of transistor Q3. The intersection of the source of transistor Q3 and resistor R10 is connected to GND. The drain of transistor Q2 is connected to one end of resistor R9. The other end of resistor R9 is connected to the power module. The intersection of the drain of transistor Q2 and resistor R9 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to the intersection of the power module and resistor R9.

[0046] Pin 2 of resistor R4 is connected to pin 1 of resistor R5 and pin 3 of transistor Q3. 12V is connected to pin 2 of transistor Q2. Pin 3 of transistor Q2 is connected to pin 1 of resistor R9 and pin 2 of capacitor C2. Pin 2 of resistor R9 and pin 1 of capacitor C2 are connected to the final ignition signal port of the power module. The ignition hold signal of the MCU is connected to the power module. The CC1 control circuit and CC2 control circuit are connected to the level conversion circuit through resistor R7.

[0047] The charging station includes resistors R6, R11, and R12, and switch S1. One end of resistor R6 is connected to the CC2 interface, and the other end of resistor R6 is connected to GND. One end of resistor R11 is connected to the positive terminal of the power supply, and the other end of resistor R11 is connected to one end of resistor R12. The other end of resistor R12 is connected to the CC1 interface. The intersection of resistors R12 and R11 is connected to one end of switch S1, and the intersection of resistor R12 and the CC1 interface is connected to the other end of switch S1.

[0048] See Figure 1 and Figure 2 In order to meet the control functions of S2 and S3 switches in the national standard, control circuits for Q1 and Q4 were designed, corresponding to S3 and S2 switches in the national standard, respectively.

[0049] See Figure 3 - Figure 9The charging station also includes a charging gun 13 and a fixing component 2 fixed inside the charging gun 13. The fixing component 2 includes a button 21, a fixing rod 29 and a spring 30. The button 21 and the fixing rod 29 are slidably connected inside the 13. Pressing the button 21 can move the fixing rod 29. Releasing the button 21 can cause the fixing rod 29 to return to its original position due to the elastic force of the spring 30. The return of the fixing rod 29 can fix the charging gun. One end of the charging gun 13 is fixedly connected to a charging cable 12. The end of the charging cable 12 away from the charging gun 13 is fixedly connected to a charging station 11. A vehicle body 1 is provided on one side of the charging station 11. The charging station 11 is provided on one side of the vehicle body 1. Two charging ports 14 are provided on one side of the interior of the vehicle body 1. The side of the charging gun 13 away from the charging cable 12 is installed inside the charging port 14.

[0050] A lifting block 22 is fixedly connected to the bottom of button 21. A trapezoidal block 23 is fixedly connected to one side of the lifting block 22. A moving plate 24 is slidably connected to the outer wall of the trapezoidal block 23. A moving rod 25 is fixedly connected to the bottom side of the moving plate 24. A moving block 26 is fixedly connected to the end of the moving rod 25 away from the moving plate 24. Multiple evenly distributed rotating plates 27 are rotatably connected to the outer wall of the moving block 26. A connecting plate 28 is rotatably connected to the side of the rotating plate 27 away from the moving block 26. A fixed rod 29 is fixedly connected to one side of the connecting plate 28. One end of the spring 30 is fixedly connected to the inside of the charging gun 13, and the other end is fixedly connected to one side of the moving block 26. The spring 30 is sleeved on the outer wall of the moving rod 25. Slider 1 31 is fixedly connected to both sides of the connecting plate 28. The outer wall of slider 1 31 is slidably connected to the inside of the charging gun 13. Slider 2 32 is fixedly connected to both sides of the moving plate 24. The outer wall of slider 2 32 is slidably connected to the inside of the charging gun 13.

[0051] The working principle of this utility model is as follows: Before inserting the gun, transistors Q1, Q2, Q3, and Q4 are turned off. After inserting the gun, the 12V level signal of the CC1 interface is divided by the voltage divider circuit of resistors R8 and R10 after passing through resistors R11 and S1. Due to the pull-up effect of the 12V at pin 3 of transistor Q3, transistor Q3 is turned on, and then transistor Q2 is turned on. At the instant that transistor Q2 is turned on, capacitor C2 is charged. At this time, a voltage rising edge is generated at pin 1 of capacitor C2. After a certain period of time, the voltage of capacitor C2 drops, and thus a pulse ignition signal is formed.

[0052] After the charging gun is inserted, the voltage divider formed by resistors R6 and R5 at the CC2 interface charging pile end pulls the voltage at pin 1 of transistor Q2 down to below 12V. Then transistor Q2 turns on. At the instant transistor Q2 turns on, capacitor C2 is charged. At this time, a voltage rising edge is generated at pin 1 of capacitor C2. After a certain period of time, the voltage of capacitor C2 drops, and the pulse ignition signal is formed.

[0053] When the power module is woken up by the pulse ignition signal, the MCU outputs an ignition hold signal. At this time, under the action of the ignition hold signal, the power module no longer depends on the wake-up level of the final ignition signal. After that, even if the charging gun is not removed after the charging is completed, the ignition signal of the MCU can be used to control the sleep mode of the battery management system.

[0054] During the charging process, pressing button 21 causes the lifting block 22 to descend. The descent of the lifting block 22 causes the trapezoidal block 23 to descend, which in turn causes the moving plate 24 to move. The moving plate 24 then causes the moving rod 25 to move, which in turn causes the moving block 26 to move. The moving block 26 then causes the rotating plate 27 to rotate, which in turn causes the connecting plate 28 to move. The moving plate 28 then causes the fixing rod 29 to move. After the fixing rod 29 moves, the charging gun 13 can be inserted into the charging port 14. Releasing button 21 causes the moving block 26 to reset due to the elasticity of the spring 30. Then, the rotating plate 27 and the connecting plate 28 work together to reset the fixing rod 29. The reset of the fixing rod 29 can fix the charging gun 13, preventing the charger from becoming loose during charging, which would affect the charging efficiency and effect, causing the charging speed to slow down or the charging to be incomplete.

[0055] The above description details one embodiment of the present utility model, but it is merely a preferred embodiment and should not be construed as limiting the scope of the present utility model. All equivalent variations and improvements made within the scope of the present utility model application should still fall within the patent coverage of the present utility model.

Claims

1. A battery management system charging wake-up circuit, comprising: The charging pile end, MCU, CC1 control circuit, CC2 control circuit, power module, and level conversion circuit are included. The charging pile end is connected with the CC1 control circuit and the CC2 control circuit through the CC1 interface and the CC2 interface respectively. The MCU is connected with the CC1 control circuit and the CC2 control circuit through the fast charging control port, and the power module is connected with the CC1 control circuit and the CC2 control circuit through the level conversion circuit.

2. The battery management system charging wake-up circuit of claim 1, wherein, The CC1 control circuit includes a resistor R16, a resistor R18, a transistor Q5, a resistor R17, a resistor R14, a transistor Q4, a resistor R15, and a resistor R13. One end of the resistor R16 is connected with the MCU through the fast charging CC1 control port, and the other end is connected with the resistor R18. The collector of the transistor Q5 is connected with the gate of the transistor Q4 and one end of the resistor R17. The other end of the resistor R17 is connected with the emitter of the transistor Q5, the source of the transistor Q4, and one end of the resistor R15, and is connected with GND.

3. The battery management system charging wake-up circuit of claim 1, wherein, The other end of the resistor R15 is connected with the resistor R13, and the other end of the resistor R13 is connected with the CC1 interface. The collector of the transistor Q5, the gate of the transistor Q4, and the intersection of the resistor R17 are connected with one end of the resistor R14. The other end of the resistor R14 is connected with the positive electrode of the power supply.

4. The battery management system charging wake-up circuit of claim 1, wherein, The CC2 control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a transistor Q1. One end of the resistor R1 is connected with the MCU through the fast charging CC2 control port, and the other end is connected with the gate of the transistor Q1. The intersection of the resistor R1 and the MCU is connected with one end of the resistor R2 and the resistor R3. The other end of the resistor R2 is connected with the source of the transistor Q1, and the other end of the resistor R3 is connected with GND. The gate of the transistor Q1 and the intersection of the resistor R1 are connected with the positive electrode of the power supply. The drain of the transistor Q1 is connected with one end of the resistor R4, and the other end of the resistor R4 is connected with the CC2 interface. The level conversion circuit includes a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a transistor Q2, a transistor Q3, and a capacitor C2. One end of the resistor R5 is connected with the CC2 interface through D1, and the other end of the resistor R5 is connected with the positive electrode of the power supply. The intersection of the resistor R5 and the positive electrode of the power supply is connected with the gate of the transistor Q2. The intersection of the resistance R5 and the CC2 interface is connected to one end of the resistance R7 and the drain of the transistor Q3, the other end of the resistance R7 is connected to the source of the transistor Q2, the gate of the transistor Q3 is connected to one end of the resistance R8, the other end of the resistance R8 is connected to the CC1 interface, the intersection of the gate of the transistor Q3 and the resistance R8 is connected to one end of the resistance R10, the other end of the resistance R10 is connected to the source of the transistor Q3, and the intersection of the source of the transistor Q3 and the resistance R10 is connected to GND. The drain of the transistor Q2 is connected to one end of the resistance R9, the other end of the resistance R9 is connected to the power module, the intersection of the drain of the transistor Q2 and the resistance R9 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the intersection of the power module and the resistance R9.

5. The battery management system charging wake-up circuit of claim 1, wherein, The charging pile end comprises a resistance R6, a resistance R11, a resistance R12 and a switch S1. One end of the resistance R6 is connected to the CC2 interface, the other end of the resistance R6 is connected to GND, one end of the resistance R11 is connected to the positive electrode of the power supply, the other end of the resistance R11 is connected to one end of the resistance R12, the other end of the resistance R12 is connected to the CC1 interface, the intersection of the resistance R12 and the resistance R11 is connected to one end of the switch S1, and the intersection of the resistance R12 and the CC1 interface is connected to the other end of the switch S1.

6. The battery management system charging wake-up circuit of claim 5, wherein, The charging pile end further comprises a charging gun (13) and a fixing assembly (2) fixed inside the charging gun (13), and the fixing assembly (2) comprises a button (21), a fixing rod (29) and a spring (30). The button (21) and the fixing rod (29) are both slidingly connected inside the charging gun (13), pressing the button (21) can drive the fixing rod (29) to move, releasing the button (21) can drive the fixing rod (29) to reset through the elastic force of the spring (30), and the fixing rod (29) resets to fix the charging gun.

7. The battery management system charging wake-up circuit of claim 1, wherein, The MCU is an S32K314 single-chip microcomputer.

Images