Electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on Internet of Things

Abstract

The utility model discloses an electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things. The system comprises a microcontroller MCU module, a lithium battery module, a lithium battery monitoring module, a 4G communication module, an alarm module, a cloud server and a remote monitoring terminal. The utility model belongs to the technical field of lithium battery management, and particularly provides an electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things, which is used for monitoring abnormal conditions of voltage, short circuit, overcurrent, over-temperature and the like of a lithium battery in an electric two-wheeled vehicle, protecting normal operation of the lithium battery and improving the reliability of the lithium battery. Meanwhile, data are uploaded to a cloud platform and a remote monitoring terminal through the Internet of Things technology, and after analysis, a calibration SOC value is issued to an MCU of the lithium battery protection board for online calibration.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery management, in particular to an electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things. Background Art

[0002] With the promulgation of the new national standard for electric bicycles, the standard has set a limit on the weight of the entire vehicle, not exceeding 55kg. Since traditional lead-acid batteries have low energy density and large mass, it is difficult to meet the new national standard, and the proportion of lithium battery electric bicycles will increase significantly. If lithium batteries are used improperly or poorly managed, they will have a short life and even the risk of spontaneous combustion. Therefore, it is necessary to add a protective device to the lithium battery to increase the service life of the lithium battery. At the same time, the battery power percentage (SOC) will be displayed when the electric two-wheeled vehicle is in use. Since the capacity of the lithium battery is easily affected by temperature and charge and discharge rate, the SOC is accurately reduced, which affects the user experience. Utility Model Content

[0003] In view of the above situation, in order to remedy the above existing defects, the utility model provides an electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things. The system is used to monitor abnormal conditions such as voltage, short circuit, overcurrent, overtemperature, etc. of the lithium battery inside the electric two-wheeled vehicle to protect the normal operation of the lithium battery. At the same time, the data is uploaded to the cloud platform and the remote monitoring terminal through the Internet of Things technology, and after analysis, the calibrated SOC value is sent to the MCU of the lithium battery protection board for online calibration.

[0004] The utility model provides the following technical solutions: The electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things proposed in the utility model includes a microcontroller MCU module, a lithium battery module, a lithium battery monitoring module, a 4G communication module, an alarm module, a cloud server and a remote monitoring terminal;

[0005] The microcontroller MCU module is the core of the entire protection system and is connected to the lithium battery monitoring module, 4G communication module, and alarm module;

[0006] The lithium battery module mainly provides electric energy for the electric two-wheeled vehicle. The lithium battery module is connected to the lithium battery monitoring module, and the lithium battery voltage, current, temperature and charging and discharging are collected through the lithium battery monitoring module;

[0007] The lithium battery monitoring module is responsible for monitoring and controlling the lithium battery, including the collection of data such as overvoltage, undervoltage, overcurrent, short circuit, overtemperature, etc.;

[0008] The alarm module is responsible for issuing alarm information. When the lithium battery monitoring module collects abnormal data, it sends it to the microcontroller MCU module. The microcontroller MCU module controls the alarm module to issue an alarm information.

[0009] The 4G communication module is responsible for transmitting the data collected by the lithium battery monitoring module to the cloud platform;

[0010] The cloud server mainly performs data processing and calculation work. When the SOC uploaded by the lithium battery monitoring module is less than 18%, the cloud server imports the temperature and current data into the model to calculate the current actual SOC;

[0011] The remote monitoring terminal mainly displays the data of each lithium battery processed by the cloud server, and at the same time, the actual SOC and related instructions can be sent to the microcontroller MCU module under the remote monitoring terminal.

[0012] Furthermore, the lithium battery monitoring module uses the SH367309 chip to monitor and control the lithium battery. The data collected by the lithium battery monitoring module includes but is not limited to voltage, current, and temperature. When the battery is over-voltage, under-voltage, over-current, short-circuited, high temperature, and low temperature, the charging and discharging MOSFET will be automatically disconnected.

[0013] Furthermore, the VC0-VC5 pins of the SH367309 chip are connected to the battery port through 1K resistors R0-R5, and the voltage collected through the VC0-VC5 pins is converted into a digital quantity through the internal 13-bit ADC and transmitted to the MCU through the TWI protocol; the SH367309 chip is powered by a lithium battery connected to the R10 resistor, and the chip MODE pin is connected to the positive electrode of the lithium battery, so that it works in the acquisition mode; after the SH367309 chip works normally, the VCC pin outputs a 3.3V voltage to power the MCU; the RS1 and RS2 pins of the SH367309 chip are connected to the current-sensing resistor, which is composed of three 3 milliohm resistors R16, R17 and R18 connected in parallel, and is converted into a digital quantity after being sampled by the internal 16-bit ADC, and is transmitted to the MCU through the TWI protocol; the V11 of the SH367309 chip , CAPS, VCC are grounded through capacitors C11, C13, and C14; CAPP of the SH367309 chip is connected to CAPN through capacitor C12; SCL and SDA of the SH367309 chip are connected to SCL and SDA of the MCU, responsible for communication functions; the ALARM pin of the SH367309 chip is connected to PB1 of the MCU, and the dormant MCU can be awakened by the rising edge; T1, T2, and T3 pins of the SH367309 chip are grounded through 10K thermistors R19, R20, and R21 and capacitors C11, C12, and C13 respectively. The 10K thermistors connected to the T1, T2, and T3 pins mainly collect the real-time temperatures of the three battery cells, which are converted into digital quantities through the internal 14-bit ADC and transmitted to the MCU through the TWI protocol; DSG of the SH367309 chip and N-channel MOSFET Q1 is connected, and CHG of the SH367309 chip is connected to P-channel MOSFET Q2 and N-channel MOSFET Q2, and charging and discharging are shut down when any one of the voltage, current and temperature data is abnormal.

[0014] When the lithium battery is powering the electric two-wheeled vehicle, the SH367309 chip of the lithium battery monitoring module monitors the status of the lithium battery in real time, and transmits the collected lithium battery data to the base station through the 4G communication module ATK-M750C. The base station transmits the collected data to the cloud server and the mobile phone; the cloud service processes the data and transmits it to the remote monitoring terminal. The remote monitoring terminal can view the status of the lithium battery in real time, and can also send the calibrated SOC and related instructions to the MCU, thereby realizing the function of remote control of the lithium battery. At the same time, when the lithium battery monitoring module collects the abnormal status of the lithium battery, it sends information to the alarm module through the MCU to generate an audible and visual alarm, and sends the alarm information to the mobile phone terminal; and under the action of the cloud server, the last 18% calibration model curve is fitted according to the temperature, charge and discharge rate and other conditions. The cloud server calculates the real SOC value based on the collected temperature and current data, and then sends it to the MUC for calibration.

[0015] The beneficial effects achieved by the utility model using the above structure are as follows: The electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things proposed by the utility model is used to monitor the voltage, short circuit, overcurrent, overtemperature and other abnormal conditions of the lithium battery inside the electric two-wheeled vehicle to protect the normal operation of the lithium battery. At the same time, the data is uploaded to the cloud platform and the remote monitoring terminal through the Internet of Things technology, and the calibrated SOC value is sent to the MCU of the lithium battery protection board for online calibration after analysis. The system realizes the protection of lithium batteries and improves the service life of lithium batteries; and ensures the display accuracy of SOC. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a principle block diagram of the utility model;

[0018] Figure 2 A circuit diagram of the lithium battery protection of the utility model;

[0019] Figure 3 It is a schematic diagram of the working principle of the utility model;

[0020] Figure 4 This is a data model diagram of the present utility model.

[0021] Among them, 1. Microcontroller MCU module, 2. Lithium battery module, 3. Lithium battery monitoring module, 4. 4G communication module, 5. Alarm module, 6. Cloud server, 7. Remote monitoring terminal. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] See also Figure 1 The electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things proposed in this embodiment includes a microcontroller MCU module 1, a lithium battery module 2, a lithium battery monitoring module 3, a 4G communication module 4, an alarm module 5, a cloud server 6 and a remote monitoring terminal 7; the microcontroller MCU module 1 is the core of the entire protection system, and is connected to the lithium battery monitoring module 3, the 4G communication module 4, and the alarm module 5; the lithium battery module 2 mainly provides power for the electric two-wheeled vehicle, the lithium battery module 2 is connected to the lithium battery monitoring module 3, and the lithium battery voltage, current, temperature and charge and discharge control of the lithium battery are collected through the lithium battery monitoring module 3; the lithium battery monitoring module 3 is responsible for monitoring and controlling the lithium battery, including overvoltage, undervoltage, overcurrent, short circuit, etc. The alarm module 5 is responsible for issuing alarm information. When the lithium battery monitoring module 3 collects abnormal data, it sends it to the microcontroller MCU module 1. The microcontroller MCU module 1 controls the alarm module 5 to issue an alarm information. The 4G communication module 4 is responsible for transmitting the data collected by the lithium battery monitoring module 3 to the cloud platform. The cloud server 6 mainly performs data processing and calculation. When the SOC uploaded by the lithium battery monitoring module 3 is less than 18%, the cloud server 6 imports the temperature and current data into the model to calculate the current actual SOC. The remote monitoring terminal 7 mainly displays the data of each lithium battery processed by the cloud server 6. At the same time, the actual SOC and related instructions can be sent to the microcontroller MCU module 1 at the remote monitoring terminal 7.

[0025] See also Figure 2In this embodiment, the lithium battery monitoring module 3 uses the SH367309 chip to monitor and control the lithium battery. The data collected by the lithium battery monitoring module 3 includes but is not limited to voltage, current, and temperature. When the battery is over-voltage, under-voltage, over-current, short-circuited, high temperature, and low temperature, the charging and discharging MOSFET will be automatically disconnected; the VC0-VC5 pins of the SH367309 chip are connected to the battery port through 1K resistors R0-R5, and the voltage collected through the VC0-VC5 pins is converted into a digital quantity through the internal 13-bit ADC and transmitted to the MCU through the TWI protocol; the SH367309 chip is powered by the lithium battery connected to the R10 resistor, and the chip MODE pin is connected to the positive electrode of the lithium battery to make it work in the acquisition mode; after the SH367309 chip works normally, the VCC pin outputs a 3.3V voltage to power the MCU; the RS1 and RS2 pins of the SH367309 chip are connected to the current sensing resistor, and the current sensing resistor is composed of three 3 milliohm resistors R16, R17 and R18 connected in parallel. After being sampled by the internal 16-bit ADC, it is converted into a digital quantity and transmitted to the MCU through the TWI protocol; V11, CAPS, and VCC of the SH367309 chip are grounded through capacitors C11, C13, and C14; CAPP of the SH367309 chip is connected to CAPN through capacitor C12; SCL and SDA of the SH367309 chip are connected to SCL and SDA of the MCU, responsible for communication functions; the ALARM pin of the SH367309 chip is connected to PB1 of the MCU, and the dormant MCU can be awakened by the rising edge; T1, T2, and T3 pins of the SH367309 chip are grounded through 10K thermistors R19, R20, and R21 and capacitors C11, C12, and C13 respectively. The 10K thermistors connected to the T1, T2, and T3 pins mainly collect the real-time temperatures of the three battery cells, which are converted into digital quantities through the internal 14-bit ADC and transmitted to the MCU through the TWI protocol; DSG of the SH367309 chip and N-channel MOSFET Q1 is connected, and CHG of the SH367309 chip is connected to P-channel MOSFET Q2 and N-channel MOSFET Q2. When any of the voltage, current and temperature data is abnormal, the charging and discharging is shut down.

[0026] See also Figure 3In this embodiment, when the lithium battery is powering the electric two-wheeled vehicle, the SH367309 chip of the lithium battery monitoring module 3 monitors the status of the lithium battery in real time, and transmits the collected lithium battery data to the base station through the 4G communication module 4ATK-M750C. The base station transmits the collected data to the cloud server 6 and the mobile phone; the cloud service processes the data and transmits it to the remote monitoring terminal 7. The remote monitoring terminal 7 can view the status of the lithium battery in real time, and can also send the calibrated SOC and related instructions to the MCU, thereby realizing the function of remotely controlling the lithium battery. At the same time, when the lithium battery monitoring module 3 collects the abnormal status of the lithium battery, it sends information to the alarm module 5 through the MCU to generate an audible and visual alarm, and sends the alarm information to the mobile phone terminal.

[0027] See also Figure 4 In this embodiment, the cloud server 6 fits the last 18% calibration model curve according to the temperature, charge and discharge rate and other conditions. The cloud server 6 calculates the real SOC value based on the collected temperature and current data and then sends it to the MUC for calibration.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things is characterized by: Including microcontroller MCU module, lithium battery module, lithium battery monitoring module, 4G communication module, alarm module, cloud server and remote monitoring terminal; The microcontroller MCU module is the core of the entire protection system and is connected to the lithium battery monitoring module, 4G communication module, and alarm module; The lithium battery module mainly provides electric energy for the electric two-wheeled vehicle. The lithium battery module is connected to the lithium battery monitoring module, and the lithium battery voltage, current, temperature and charging and discharging are collected through the lithium battery monitoring module; The lithium battery monitoring module is responsible for monitoring and controlling the lithium battery, including the collection of data such as overvoltage, undervoltage, overcurrent, short circuit, overtemperature, etc.; The alarm module is responsible for issuing alarm information. When the lithium battery monitoring module collects abnormal data, it sends it to the microcontroller MCU module. The microcontroller MCU module controls the alarm module to issue an alarm information. The 4G communication module is responsible for transmitting the data collected by the lithium battery monitoring module to the cloud platform; The cloud server mainly performs data processing and computing work; The remote monitoring terminal mainly displays the data of each lithium battery processed by the cloud server, and at the same time, the actual SOC and related instructions can be sent to the microcontroller MCU module under the remote monitoring terminal.

2. The electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things according to claim 1 is characterized in that: The lithium battery monitoring module uses the SH367309 chip to monitor and control the lithium battery. The data collected by the lithium battery monitoring module includes but is not limited to voltage, current, and temperature. When the battery is over-voltage, under-voltage, over-current, short-circuited, high temperature, or low temperature, the charging and discharging MOSFET will be automatically disconnected.

3. The electric two-wheeled vehicle lithium battery protection and SOC online calibration system based on the Internet of Things according to claim 2 is characterized in that: The VC0-VC5 pins of the SH367309 chip are connected to the battery port through 1K resistors R0-R5. The voltage collected through the VC0-VC5 pins is converted into a digital quantity through the internal 13-bit ADC and transmitted to the MCU through the TWI protocol; the SH367309 chip is powered by a lithium battery connected to the R10 resistor, and the chip MODE pin is connected to the positive electrode of the lithium battery, so that it works in the acquisition mode; after the SH367309 chip works normally, the VCC pin outputs a 3.3V voltage to power the MCU; the RS1 and RS2 pins of the SH367309 chip are connected to the current-sensing resistor, which is composed of three 3 milliohm resistors R16, R17 and R18 connected in parallel, and is converted into a digital quantity after being sampled by the internal 16-bit ADC, and is transmitted to the MCU through the TWI protocol; the V11, CA PS and VCC are grounded through capacitors C11, C13, and C14; CAPP of the SH367309 chip is connected to CAPN through capacitor C12; SCL and SDA of the SH367309 chip are connected to SCL and SDA of the MCU, responsible for communication functions; the ALARM pin of the SH367309 chip is connected to PB1 of the MCU, and the dormant MCU can be awakened by the rising edge; T1, T2, and T3 pins of the SH367309 chip are grounded through 10K thermistors R19, R20, and R21 and capacitors C11, C12, and C13 respectively. The 10K thermistors connected to the T1, T2, and T3 pins mainly collect the real-time temperatures of the three battery cells, which are converted into digital quantities through the internal 14-bit ADC and transmitted to the MCU through the TWI protocol; DSG of the SH367309 chip and N-channel MOSFET Q1 is connected, and CHG of the SH367309 chip is connected to P-channel MOSFET Q2 and N-channel MOSFET Q2, and charging and discharging are shut down when any one of the voltage, current and temperature data is abnormal.

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