Auxiliary power supply automatic switching system and method based on BMS

Abstract

The invention provides an auxiliary power supply automatic switching system and method based on a BMS, and belongs to the technical field of automobile power supply management, and the system comprises an intelligent boost module which is used for receiving an input voltage and transmitting the input voltage to a BMS auxiliary power supply switch, and the BMS auxiliary power supply switch is electrically connected with the intelligent boost module and used for switching the input voltage to the BMS auxiliary power supply switch. The charging control module is electrically connected with the BMS auxiliary power switch and the charging control module and used for receiving an external control instruction and an input voltage, closing itself based on the external control instruction and transmitting the input voltage to the automobile power management system, and the automobile battery management system is electrically connected with the BMS auxiliary power switch and the charging control module and used for receiving the input voltage and supplying power to itself based on the input voltage. The power supply module is used for generating BMS message information based on the self power supply state and sending the BMS message information to the charging control module, and the charging control module is used for receiving the BMS message information and confirming the power supply state of the automobile battery management system.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile power management, and in particular to a BMS-based auxiliary power automatic switching system and method. Background Art

[0002] Most new energy vehicles on the market use a 12VDC BMS auxiliary power supply. The current standard for charging pile products is GB∕T 18487.1-2023, which requires that the auxiliary power supply of the BMS on new energy vehicles be 12VDC. Prior to this, the standard version was GB∕T 18487.1-2015, which required that the auxiliary power supply of the BMS on new energy vehicles be 12VDC. This standard has been in effect since 2015, and it has been nearly 10 years.

[0003] However, most of the models on the market, especially new energy commercial vehicles, still have a BMS auxiliary power supply of 24V, with an operating range of 18V-32V, and some are 9-36VDC. And the voltage range may be different for each model design. This leads to the need for a 12 / 24V BMS voltage setting button on the charging pile. When charging, the BMS voltage needs to be set according to the actual model. This requires the owner to have a certain understanding of their own model. In actual applications, many owners are not clear about the auxiliary voltage range of the BMS on their car, resulting in certain application difficulties. At present, the factory default setting of the general manufacturer's products is 12V. When a model cannot be charged, the owner can manually set it to 24V and try it. In addition, some manufacturers adopt the following method to realize the automatic switching of the 12 / 24V BMS voltage, specifically: in the software implementation of the product, when charging by default, the 12V BMS voltage is first given. If the pile and the car cannot communicate within a certain period of time, the pile switching relay will act and give a 24V BMS voltage.

[0004] This technology has risks that cannot be fundamentally resolved. Specifically, if the charging pile and the car fail to communicate successfully due to other reasons when charging the passenger car, the "switch BMS power supply" function of the charging pile will be executed, and a 24V BMS voltage will be given. If the hardware withstand voltage upper limit of the BMS auxiliary voltage circuit of the passenger car is lower than 24V, there is a risk of burning the BMS auxiliary power circuit hardware of the passenger car. Therefore, in the prior art, there is a risk of voltage mismatch when the external power supply is used to charge the car BMS, resulting in the risk of burning the BMS auxiliary power circuit hardware of the passenger car. Summary of the invention

[0005] In view of this, it is necessary to provide a BMS-based auxiliary power automatic switching system and method to solve the risk of burning the passenger car BMS auxiliary power circuit hardware due to voltage mismatch when charging the automobile BMS with an external power supply in the prior art.

[0006] In order to solve the above technical problems, on the one hand, the present invention provides an auxiliary power automatic switching system based on BMS, comprising: An intelligent boost module, used to receive input voltage and transmit the input voltage to the BMS auxiliary power switch; The BMS auxiliary power switch is electrically connected to the intelligent boost module, and is used to receive external control instructions and input voltage, close itself based on the external control instructions, and transmit the input voltage to the vehicle power management system; The vehicle battery management system is electrically connected to the BMS auxiliary power switch and the charging control module, and is used to receive an input voltage, supply power to itself based on the input voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module; The charging control module is used to receive BMS message information and confirm the power supply status of the vehicle battery management system.

[0007] In one possible implementation, The charging control module is also used to receive the input voltage and the driving signal when no BMS message information is received, and generate a PWM signal based on the driving signal, adjust the voltage value of the input voltage based on the PWM signal to obtain the regulated voltage, and transmit the regulated voltage to the BMS auxiliary power switch, and send the driving signal to the intelligent boost module.

[0008] In one possible implementation, The intelligent boost module is also used to receive a drive signal and disconnect the BMS auxiliary power switch based on the drive signal.

[0009] In one possible implementation, The BMS auxiliary power switch is electrically connected to the charging control module and is also used to close itself and transmit the regulated voltage to the vehicle power management system based on external control instructions.

[0010] In one possible implementation, The vehicle power management system is also used to power itself based on the regulated voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module.

[0011] In a possible implementation, the system further includes: The power supply module is electrically connected to the charging control module and is used to provide input voltage to the charging control module.

[0012] In one possible implementation, The power supply module is also electrically connected to the intelligent boost module and is used to provide input voltage to the intelligent boost module.

[0013] In a possible implementation, the charging control module includes: Inductors, capacitors, resistors, diodes and circuit switch tubes; The circuit switch tube is connected in parallel with the capacitor, and the capacitor is connected in parallel with the resistor; The circuit switch tube is electrically connected to the inductor and the diode respectively, and the diode is electrically connected to the capacitor.

[0014] In a possible implementation, the intelligent boost module includes: A relay, one end of the relay is electrically connected to the inductor, and the other end of the relay is electrically connected to the resistor.

[0015] On the other hand, the present invention also provides a method for automatic switching of auxiliary power supply based on BMS, comprising: Receive input voltage through the intelligent boost module and transmit the input voltage to the BMS auxiliary power switch; Receive external control instructions and input voltage through the BMS auxiliary power switch, close itself based on the external control instructions and transmit the input voltage to the vehicle power management system; Receive input voltage through the vehicle battery management system, power itself based on the input voltage, and generate BMS message information based on its own power supply status; Receive BMS message information through the charging control module and confirm the power supply status of the vehicle battery management system.

[0016] The beneficial effects of the present invention are as follows: the auxiliary power automatic switching system based on BMS provided by the present invention includes: an intelligent boost module, used to receive input voltage and transmit the input voltage to the BMS auxiliary power switch; the BMS auxiliary power switch, electrically connected to the intelligent boost module, used to receive external control instructions and input voltage, close itself based on the external control instructions and transmit the input voltage to the automobile power management system; the automobile battery management system, electrically connected to the BMS auxiliary power switch and the charging control module, used to receive input voltage, power itself based on the input voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module; the charging control module, used to receive the BMS message information and confirm the power supply status of the automobile battery management system. The BMS-based auxiliary power automatic switching system provided by the present invention first receives input voltage through an intelligent boost module, and transmits the input voltage to the automobile battery management system through a BMS auxiliary power switch, and supplies power to the automobile battery management system based on the input voltage. When the input voltage meets the power voltage of the automobile battery management system, the automobile battery management system will generate BMS message information, and send the generated BMS message information to the charging control module. The charging control module can perform the following analysis based on the received BMS message information: receiving the BMS message information indicates that the automobile battery management system is powered on normally; not receiving the BMS message information indicates that the input voltage does not meet the power voltage of the automobile battery management system, the automobile battery management system is not powered on, and the BMS message information cannot be generated. The input voltage is slowly adjusted until the automobile battery management system generates the BMS message information. Based on the BMS message information, the power supply status of the automobile battery management system can be obtained, and different processing is performed based on different power supply conditions to avoid the burning of the BMS system hardware of the charging vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the auxiliary power automatic switching system based on BMS provided by the present invention; Figure 2 A circuit diagram of an embodiment of the BMS-based auxiliary power automatic switching system provided by the present invention; Figure 3 A schematic diagram of an embodiment of an auxiliary power automatic switching system based on BMS provided by the present invention; Figure 4A flow chart of an embodiment of a method for automatic switching of auxiliary power supply based on BMS provided by the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0021] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or equipment.

[0022] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] The present invention provides an auxiliary power automatic switching system and method based on BMS (Battery Management System), which are respectively described below.

[0025] Figure 1 A schematic diagram of an embodiment of the automatic switching system for auxiliary power supply based on BMS provided by the present invention includes: The intelligent boost module 101 is used to receive the input voltage and transmit the input voltage to the BMS auxiliary power switch 102; The BMS auxiliary power switch 102 is electrically connected to the intelligent boost module 101, and is used to receive external control instructions and input voltage, close itself based on the external control instructions, and transmit the input voltage to the vehicle power management system; The vehicle battery management system 103 is electrically connected to the BMS auxiliary power switch 102 and the charging control module 104, and is used to receive an input voltage, supply power to itself based on the input voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module 104; The charging control module 104 is used to receive BMS message information and confirm the power supply status of the vehicle battery management system 103.

[0026] It is understandable that the existing technology is to switch between 12V or 24V, either 12V or 24V. If the BMS system operating voltage of the vehicle does not support 24V, switching the BMS power supply from 12V to 24V will cause the BMS system hardware of the vehicle to burn out. The switching is too simple, with only two states, either 12V or 24V, and there is no gradual adjustment of the BMS power supply voltage. Dynamically adjusting the BMS power supply voltage-confirming-dynamically adjusting it again is the highlight of this solution. Avoid switching between two states, which may cause the BMS system hardware of the charging vehicle to burn out. If the upper limit of the BMS system power supply of a certain electric vehicle is 18V, if it is directly switched to 24V input at this time, the BMS system hardware will burn out.

[0027] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0028] 2. Use the closure of K2 to bypass the boost circuit in the intelligent boost module 101, and do not send the PWM (Pulse Width Modulation) adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0029] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0030] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0031] In some embodiments of the present invention, The charging control module 104 is also used to receive the input voltage and the driving signal when no BMS message information is received, and generate a PWM signal based on the driving signal, adjust the voltage value of the input voltage based on the PWM signal to obtain the regulated voltage, and transmit the regulated voltage to the BMS auxiliary power switch 102, and send the driving signal to the intelligent boost module 101.

[0032] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0033] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0034] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0035] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0036] In some embodiments of the present invention, The intelligent boost module 101 is further used to receive a driving signal and disconnect the BMS auxiliary power switch 102 based on the driving signal.

[0037] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0038] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0039] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0040] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0041] In some embodiments of the present invention, The BMS auxiliary power switch 102 is electrically connected to the charging control module 104 and is also used to close itself based on external control instructions and transmit the regulated voltage to the vehicle power management system.

[0042] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0043] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0044] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0045] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0046] In some embodiments of the present invention, The automobile power management system is also used to power itself based on the regulated voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module 104.

[0047] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0048] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0049] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0050] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0051] In some embodiments of the present invention, the system further comprises: The power supply module is electrically connected to the charging control module 104 and is used to provide input voltage to the charging control module 104 .

[0052] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0053] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0054] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0055] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0056] In some embodiments of the present invention, The power supply module is also electrically connected to the intelligent boost module 101 and is used to provide input voltage to the intelligent boost module 101 .

[0057] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0058] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0059] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0060] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0061] Figure 2 A circuit diagram of an embodiment of the auxiliary power automatic switching system based on BMS provided by the present invention includes: Inductors, capacitors, resistors, diodes and circuit switch tubes; The circuit switch tube is connected in parallel with the capacitor, and the capacitor is connected in parallel with the resistor; The circuit switch tube is electrically connected to the inductor and the diode respectively, and the diode is electrically connected to the capacitor.

[0062] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0063] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0064] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0065] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0066] Figure 3 The schematic diagram of an embodiment of the BMS-based auxiliary power automatic switching system provided by the present invention includes: A relay, one end of the relay is electrically connected to the inductor, and the other end of the relay is electrically connected to the resistor.

[0067] It can be understood that the working process of the BMS-based auxiliary power automatic switching system proposed by the present invention is as follows: 1. When leaving the factory, the default output of the charging pile BMS power supply is 12V. At this time, a conventional switching power supply is required as the input of the BMS auxiliary power supply, which is connected to the input end of the intelligent boost module 101. The factory default charging control module 104 controls the A1 drive signal of the relay K2 to be enabled, and the relay K2 is closed.

[0068] 2. Use K2 to close to bypass the boost circuit in the smart boost module 101, and do not send the PWM adjustment signal to turn off S1. The 12V BMS power supply is input to the BMS of the new energy vehicle through the BMS auxiliary power switch 102 and the charging gun.

[0069] 3. After the charging control module 104 supplies 12V power to the BMS of the new energy vehicle, it continuously monitors the BMS message information. If the charging control module 104 has not received the communication message from the BMS on the vehicle, it means that the BMS system on the vehicle is not working properly; 4. At this time, it is determined that the BMS power supply of the new energy vehicle is not 12V. The charging control module 104 disconnects the A1 drive signal and the relay K2 is disconnected. The charging control module 104 outputs a PWM signal, adjusts the drive signal of the BOOST circuit switch tube S1, adjusts the output voltage, and accumulates it at a rate of 1V / 3S, that is, the output BMS auxiliary voltage increases by 1V every 3s, and after increasing by 1V, it is maintained for 3s. At this time, the charging control module 104, through the connection between the charging gun and the charging vehicle, continuously monitors the BMS message of the charging vehicle. If no message is received from the vehicle-side BMS, it continues to accumulate. And collect the output voltage at any time to confirm the output voltage.

[0070] 5. Repeat the above process until the message sent by the vehicle-side BMS can be received. This means that the previous voltage value is the working voltage of the vehicle-side BMS. The charging control module 104 records the VIN code of the vehicle and binds it to the auxiliary power supply that is currently working normally. It is uploaded to the cloud platform as a database record and archived as a database file for the vehicle's active monitoring function; 6. The current charging pile enters the normal charging workflow; 7. According to the above ratio and rate, adjust the BMS auxiliary voltage to avoid directly supplying 24V from 12V, which may cause the risk of burning out the electric vehicle BMS hardware.

[0071] Figure 4 A schematic flow chart of an embodiment of a method for automatic switching of auxiliary power supply based on BMS provided by the present invention includes: S401, receiving input voltage through the intelligent boost module, and transmitting the input voltage to the BMS auxiliary power switch; S402, receiving an external control instruction and an input voltage through a BMS auxiliary power switch, closing itself based on the external control instruction and transmitting the input voltage to the vehicle power management system; S403, receiving an input voltage through a vehicle battery management system, supplying power to the vehicle based on the input voltage, and generating BMS message information based on the vehicle power supply status; S404, receiving BMS message information through the charging control module and confirming the power supply status of the vehicle battery management system.

[0072] The BMS-based auxiliary power automatic switching system and method provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An auxiliary power automatic switching system based on BMS, characterized in that: include: An intelligent boost module, used to receive input voltage and transmit the input voltage to the BMS auxiliary power switch; The BMS auxiliary power switch is electrically connected to the intelligent boost module, and is used to receive external control instructions and input voltage, close itself based on the external control instructions, and transmit the input voltage to the vehicle power management system; The vehicle battery management system is electrically connected to the BMS auxiliary power switch and the charging control module, and is used to receive an input voltage, supply power to itself based on the input voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module; The charging control module is used to receive BMS message information and confirm the power supply status of the vehicle battery management system.

2. The BMS-based auxiliary power automatic switching system according to claim 1 is characterized in that: The charging control module is also used to receive the input voltage and the driving signal when no BMS message information is received, and generate a PWM signal based on the driving signal, adjust the voltage value of the input voltage based on the PWM signal to obtain the regulated voltage, and transmit the regulated voltage to the BMS auxiliary power switch, and send the driving signal to the intelligent boost module.

3. The BMS-based auxiliary power automatic switching system according to claim 2 is characterized in that: The intelligent boost module is also used to receive a drive signal and disconnect the BMS auxiliary power switch based on the drive signal.

4. The BMS-based auxiliary power automatic switching system according to claim 3 is characterized in that: The BMS auxiliary power switch is electrically connected to the charging control module and is also used to close itself and transmit the regulated voltage to the vehicle power management system based on external control instructions.

5. The BMS-based auxiliary power automatic switching system according to claim 4 is characterized in that: The vehicle power management system is also used to power itself based on the regulated voltage, generate BMS message information based on its own power supply status, and send the BMS message information to the charging control module.

6. The BMS-based auxiliary power automatic switching system according to claim 1, characterized in that: The system further comprises: The power supply module is electrically connected to the charging control module and is used to provide input voltage to the charging control module.

7. The BMS-based auxiliary power automatic switching system according to claim 6, characterized in that: The power supply module is also electrically connected to the intelligent boost module and is used to provide input voltage to the intelligent boost module.

8. The BMS-based auxiliary power automatic switching system according to claim 6, characterized in that: The charging control module comprises: Inductors, capacitors, resistors, diodes and circuit switch tubes; The circuit switch tube is connected in parallel with the capacitor, and the capacitor is connected in parallel with the resistor; The circuit switch tube is electrically connected to the inductor and the diode respectively, and the diode is electrically connected to the capacitor.

9. The BMS-based auxiliary power automatic switching system according to claim 7, characterized in that: The intelligent boost module comprises: A relay, one end of the relay is electrically connected to the inductor, and the other end of the relay is electrically connected to the resistor.

10. A method for automatic switching of auxiliary power supply based on BMS, characterized in that: include: Receive input voltage through the intelligent boost module and transmit the input voltage to the BMS auxiliary power switch; Receive external control instructions and input voltage through the BMS auxiliary power switch, close itself based on the external control instructions and transmit the input voltage to the vehicle power management system; Receive input voltage through the vehicle battery management system, power itself based on the input voltage, and generate BMS message information based on its own power supply status; Receive BMS message information through the charging control module and confirm the power supply status of the vehicle battery management system.

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