Lithium battery detection device

Abstract

The invention relates to the field of battery detection, in particular to a lithium battery detection device. The device comprises a shell, a single-chip microcomputer and various sensors are arranged in the shell, the shell comprises an outer ring shell and an inner shell, and the outer ring shell is in a front-back through square cylinder shape; the inner shell is a hollow column with an upward opening, a plurality of holes are formed in the front surface of the inner shell, and the outer ring shell and the inner shell are in a drawing type; the front surface of the inner shell is provided with a wire hole, and the top surface of the inner shell is provided with an openable top hole. The inner shell and the outer ring shell are provided with a structure which is used for monitoring voltage, current, temperature and other parameters of the battery in real time and only comprises the inner layer and the outer layer, the battery state can be monitored in real time, it is ensured that the battery is safe and reliable, and the device is simple in structure, low in cost and suitable for being applied to various battery monitoring and other daily life scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a lithium battery detection device. Background Art

[0002] Fires caused by spontaneous combustion of electric vehicle batteries occur frequently, posing a great threat to people’s lives and property. At the same time, the expansion and explosion of the batteries due to overcharging ignite the plastic parts of the electric vehicle, releasing large amounts of toxic gases that damage the ecological environment.

[0003] Traditional lithium battery monitoring systems often have a single function, only monitoring basic parameters such as voltage and current, and lack the ability to comprehensively monitor the lithium battery operating environment (such as temperature and humidity) and potential hazards (such as smoke). Therefore, it is particularly important to develop a comprehensive detection device that can detect multiple parameters of lithium batteries and promptly alarm when abnormal conditions occur. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lithium battery detection device, which is developed based on an STM32 single-chip microcomputer and can monitor the single cell voltage, charge and discharge current, temperature and humidity of the battery in real time.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a lithium battery detection device, comprising an information monitoring terminal and a client; the information monitoring terminal comprises a housing, a main controller, and a GPS sensor, a temperature and humidity sensor, a current sensor, a voltage sensor, a smoke sensor, an alarm device, and a communication network electrically connected to the main controller;

[0006] The main controller is arranged inside the shell, the GPS sensor collects the location information of the lithium battery, the temperature and humidity sensor collects the temperature and humidity data of the lithium battery, the current sensor collects the current data of the lithium battery, the voltage sensor collects the voltage data of the lithium battery, and the smoke sensor collects the smoke concentration data around the lithium battery. The main controller receives the data collected by each sensor and compares the collected data with a preset threshold value. When the collected data exceeds the preset threshold value, the alarm device is controlled to sound an alarm and send the collected data to the client through the communication network.

[0007] Furthermore, the shell comprises an outer ring shell and an inner shell, the outer ring shell is in the shape of a square cylinder with smooth side walls; the inner shell is in the shape of a square box.

[0008] The opening faces upwards, and the inner shell is located inside the outer ring shell and connected with the outer ring shell in a pull-out nesting manner.

[0009] Furthermore, a display screen, a sensor mounting slot and a power cord connection hole are provided on the front side of the inner shell.

[0010] Furthermore, the main controller adopts an STM32F103 single-chip microcomputer, and the main controller is connected to a GPS sensor, a temperature and humidity sensor, a current sensor, a voltage sensor, and a smoke sensor through an NB-IOT module;

[0011] Furthermore, the main controller is connected to the lithium battery via a dual-resistance voltage divider circuit, and the dual-resistance voltage divider circuit divides the voltage of the lithium battery via two resistors connected in series, and then connects the voltage division signal to the ADC pin of the STM32F103 single-chip microcomputer.

[0012] Furthermore, the current sensor adopts a Hall effect current sensor, the current sensor is connected in series in the lithium battery charging and discharging circuit, the current sensor outputs a corresponding voltage signal according to the current size, and the voltage signal is connected to the ADC pin of STM32F103.

[0013] The advantages of the present invention compared with the prior art are:

[0014] The present invention evaluates the health status of the battery by measuring the battery's voltage, current, temperature and other parameters, and provides real-time monitoring and alarm functions to ensure the safety and reliability of the battery.

[0015] The present invention can help users better understand the state and performance of the battery, improve the efficiency and life of the battery, and has important significance for electric vehicles, energy storage systems and other battery applications.

[0016] The present invention integrates voltage monitoring, temperature monitoring, positioning, and real-time warning, and adopts positioning modules, voltage sensors, current sensors, etc. Real-time battery safety data is transmitted to the user's mobile phone through the network to prompt and warn in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a shell of a lithium battery detection device of the present invention.

[0018] Figure 2 It is a schematic diagram of the main structure of an inner shell of a lithium battery detection device of the present invention.

[0019] Figure 3 The present invention is a schematic diagram of the internal structure of a shell of a lithium battery detection device.

[0020] Figure 4 The present invention is a system block diagram of a lithium battery detection device.

[0021] As shown in the figure: 1. Outer ring shell, 2. Inner shell, 3. Display screen, 4. Sensor installation slot, 5. Power cord connection hole. DETAILED DESCRIPTION

[0022] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inside”, “outside”, “vertical” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] A lithium battery detection device of the present invention is further described in detail below with reference to the accompanying drawings.

[0025] Working principle of the present invention:

[0026] The purpose of this invention is to study a digital power battery pack monitoring device, which is developed based on the STM32 single-chip microcomputer and can monitor the single-cell voltage, charge and discharge current, temperature and humidity of the battery in real time. To realize the centralized monitoring of battery pack parameters, it is necessary to first design a unit acquisition circuit for battery parameters, collect the battery voltage, current, temperature and other data, and then input them into a single-chip microcomputer with an A / D conversion module to record and display the data. The software and hardware design of the system is studied and analyzed.

[0027] First, it can evaluate the health of the battery by measuring battery voltage, current, temperature and other parameters, and provide real-time monitoring and alarm functions to ensure the safety and reliability of the battery.

[0028] Second, there are many types and applications of digital power battery monitoring devices. For example, there is a high-precision battery testing instrument that can be used in the fields of new energy power generation, power batteries and fuel cells. In addition, there is a current sensor that can be used for accurate monitoring of electric vehicle batteries. In addition, there is a technology based on magnetic field scanning imaging that can achieve in-situ non-destructive testing of the capacity consistency of power battery packs.

[0029] Third, it can help us better understand the status and performance of batteries and improve the efficiency and life of batteries. It is of great significance for electric vehicles, energy storage systems and other battery applications.

[0030] Based on the STM32 development board, the organic synthesis optimized integrated sensor is the basis of the electric vehicle battery real-time monitoring and alarm device.

[0031] Fourth, the digital power battery real-time monitoring device integrates voltage monitoring, temperature monitoring, Beidou system positioning, real-time warning, and deformation detection. It is composed of displacement sensors, Beidou system positioning modules, voltage sensors, current sensors, deformation sensors, etc. Through the 4G / 5G module and the cloud computing connection in the Internet, the real-time battery safety data is transmitted to the user's mobile phone for prompts and timely warnings (preset safety data, voice prompts or warnings when exceeding the data) and uploaded to the electric vehicle manufacturer for data collection and sorting, clean mining.

[0032] When monitoring the battery, if any abnormal conditions occur, such as displacement or rapid temperature rise, the device will send information to the owner within 2 seconds and automatically cut off the power remotely; when the battery is safe, the device will be in sleep mode.

[0033] Combined with Figure 1-4 The specific implementation process of a lithium battery detection device of the present invention is as follows:

[0034] This embodiment provides a lithium battery monitoring device, which includes a shell and a monitoring component placed in the shell. The shell is used to place various monitoring components and can adjust monitoring data. The monitoring component is used to collect monitoring data and output monitoring results.

[0035] like Figure 1 The shell includes an outer ring shell 1 and an inner shell 2. In the figure, the front side is the inner shell 2 and the rear side is the outer ring shell 1.

[0036] The outer ring shell 1 is in the shape of a square cylinder, which is through from front to back and has smooth side walls; the bottom of the side wall has no bottom opening.

[0037] The inner shell 2 is in the shape of a square box with an opening facing upwards. A handle display screen 3 is provided on the front side thereof for displaying the data of various monitoring items. A sensor mounting slot 4 is also provided for placing various sensors. The two holes in the lower right corner are power cord connection holes 5 for connecting the power cord.

[0038] The inner shell 2 and the outer ring shell 1 are arranged to be nested, and the inner shell 2 can be put into the outer ring shell 1, adopting a pull-out type. When the power supply is connected, the real-time temperature is displayed on the display screen 3, and each sensor starts to work. Figure 3 It includes a temperature and humidity sensor, a single-chip microcomputer, and monitoring, etc., which are arranged in the inner shell 2 and are mainly responsible for the collection and judgment of temperature and humidity.

[0039] Among them, the monitoring process is: after the temperature and humidity sensor receives the signal, the signal is processed by the single-chip microcomputer, and the output signal is transmitted to the monitoring device. The monitoring device is connected to the display screen 3 arranged outside the shell, and finally the battery monitoring is completed through the display screen 3 and the buzzer alarm.

[0040] During use, when there is an abnormal signal (current, voltage, temperature exceeds the rated value), the signal is transmitted to the single-chip microcomputer, and the single-chip microcomputer transmits it to the display screen 3 and the alarm device, and at the same time cuts off the power supply to ensure power safety.

[0041] like Figure 4 The main controller uses an STM32F103 microcontroller, which is connected to the NB-IOT module, alarm device, communication network and power supply to realize battery monitoring. The STM32F103 chip is used to transmit the received signal to the NB-IOT module to monitor the battery parameters. When an adverse situation occurs, the display 3 is displayed and an alarm is issued. The use of this codec greatly improves the monitoring of battery parameters (voltage, current, temperature, humidity).

[0042] The following is how the STM32F103 monitors battery parameters:

[0043] Voltage monitoring

[0044] Hardware design: Use a dual resistor voltage divider circuit to divide the battery voltage through two series resistors, and then connect the voltage divider signal to the ADC pin of the STM32F103. Calculate and select the appropriate resistor value based on the battery voltage range and the ADC input range of the STM32F103.

[0045] Software settings: Configure the analog input GPIO port to GPIOModeAIN mode, set the ADC to continuous conversion mode, right alignment, non-external trigger, etc. After ADC sampling and conversion, calculate the actual battery voltage based on the voltage divider ratio and ADC reference voltage.

[0046] Current monitoring

[0047] Use current sensor: For example, use a Hall effect current sensor in series in the battery charge and discharge circuit. The sensor outputs a corresponding voltage signal according to the current size, and the signal is connected to the ADC pin of the STM32F103.

[0048] Processing and calculation: If the sensor outputs a bidirectional current signal, a signal preprocessing circuit can be designed to control the voltage variation range within the ADC input range of the STM32F103. The ADC of the STM32F103 samples and converts the processed voltage signal, and calculates the battery charge and discharge current based on the sensor conversion coefficient and ADC data.

[0049] Temperature monitoring

[0050] Hardware connection: You can connect an external temperature sensor, such as a thermistor, to the GPIO port or ADC pin of the STM32F103. When connected to the ADC pin, the resistance change of the thermistor due to temperature change is detected and converted into voltage change input to the STM32F103.

[0051] Software implementation: In the software, configure the corresponding GPIO port or ADC channel for data collection. Calculate the battery temperature based on the characteristic curve of the temperature sensor and the collected data.

[0052] Power monitoring

[0053] Coulomb counter method: using a dedicated coulomb counter chip, through I 2 C or SPI and other communication interfaces are connected to STM32F103. The coulomb counter chip monitors the charge and discharge current of the battery in real time, and integrates the current to obtain the power. STM32F103 reads the power data in the coulomb counter chip through the communication interface.

[0054] Model-based method: Establish a relationship model between battery power and parameters such as voltage, current, and temperature. STM32F103 collects battery voltage, current, temperature and other parameters in real time, and substitutes them into the model to calculate the battery power.

[0055] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A lithium battery detection device, characterized in that: It includes an information monitoring terminal and a client; the information monitoring terminal includes a housing, a main controller, and a GPS sensor, a temperature and humidity sensor, a current sensor, a voltage sensor, a smoke sensor, an alarm device, and a communication network electrically connected to the main controller; The main controller is arranged inside the shell, the GPS sensor collects the location information of the lithium battery, the temperature and humidity sensor collects the temperature and humidity data of the lithium battery, the current sensor collects the current data of the lithium battery, the voltage sensor collects the voltage data of the lithium battery, and the smoke sensor collects the smoke concentration data around the lithium battery. The main controller receives the data collected by each sensor and compares the collected data with a preset threshold value. When the collected data exceeds the preset threshold value, the alarm device is controlled to sound an alarm and send the collected data to the client through the communication network.

2. A lithium battery detection device according to claim 1, characterized in that: The shell comprises an outer ring shell and an inner shell. The outer ring shell is in a square cylinder shape with smooth side walls. The inner shell is in a square box shape with an upward opening. The inner shell is inside the outer ring shell and is connected to the outer ring shell in a pull-out nested manner.

3. A lithium battery detection device according to claim 2, characterized in that: A display screen, a sensor installation slot and a power line connection hole are arranged on the front side of the inner shell.

4. A lithium battery detection device according to claim 3, characterized in that: The main controller adopts an STM32F103 single-chip microcomputer, and the main controller is connected to a GPS sensor, a temperature and humidity sensor, a current sensor, a voltage sensor, and a smoke sensor through an NB-IOT module.

5. A lithium battery detection device according to claim 4, characterized in that: The main controller is connected to the lithium battery through a dual-resistance voltage-dividing circuit. The dual-resistance voltage-dividing circuit divides the voltage of the lithium battery through two resistors connected in series, and then connects the voltage-dividing signal to the ADC pin of the STM32F103 single-chip microcomputer.

6. A lithium battery detection device according to claim 5, characterized in that: The current sensor adopts a Hall effect current sensor, which is connected in series in the lithium battery charging and discharging circuit. The current sensor outputs a corresponding voltage signal according to the current size, and the voltage signal is connected to the ADC pin of STM32F103.

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