CN203135533U - A mining power supply device based on lithium iron phosphate batteries - Google Patents

Abstract

The utility model discloses a mining power supply device based on lithium iron phosphate batteries. The mining power supply device comprises a lithium iron phosphate battery unit, a data acquiring module, a master control module, a fault alarm module, and a charger. The data acquiring module comprises a voltage sensor, a current sensor, and a temperature sensor. The voltage sensor and the current sensor are connected with the lithium iron phosphate battery unit. The temperature sensor is disposed on a box body of the lithium iron phosphate battery unit. The master control module is connected with the lithium iron phosphate battery unit through the charger and controls the operative states of the fault alarm module and the charger according to the input voltage, the input current, and the box body temperature of the data acquiring module. The mining power supply device is capable of prolonging the service life of a battery set and increasing the energy efficiency of the battery set and has advantages of high efficient battery set management, equalized battery control, safety and reliability, and stable power supply.

Description

Mine power supply device based on lithium iron phosphate battery

technical field

The utility model relates to the field of power supplies, in particular to a mining power supply device based on a lithium iron phosphate battery.

Background technique

With the development of industrial technology, especially the application of information technology in coal mines, the safety production situation of coal mines in my country tends to improve in general, but the probability of accidents is still relatively high, and with the deepening of coal mining, accidents and disasters tend to increase. These Objective factors have brought great pressure and challenges to emergency rescue. The state attaches great importance to the research and development of emergency rescue technology and equipment, and strongly supports related projects such as mine rescue cabins, mobile rescue cabins, and coal mine emergency avoidance systems. During the use of the mining rescue cabin, a dedicated power supply system is required to provide reliable and long-term uninterrupted safe power supply to ensure the reliable implementation of rescue work. In addition to the excellent characteristics of ordinary lithium batteries in terms of capacity, power, safety, and environmental friendliness, lithium iron phosphate batteries also have the characteristics of non-combustion and non-explosion, which meets the explosion-proof safety requirements of underground coal mine operations and significantly improves The safety of underground power supply in coal mines, so the backup power supply of coal mine equipment gradually tends to use lithium iron phosphate battery packs for power supply.

The voltage of a single lithium iron phosphate battery cell is only about 3.3V, and its capacity is limited. Therefore, when used in a high-power coal mine industrial system, multiple cells must be used in series and in parallel to form a battery pack to meet the capacity and load requirements. Require. Due to the differences in the manufacturing process and charging and discharging characteristics of each battery cell, the inferior battery cell will age faster than the other batteries. Once a certain battery cell is overcharged, it will overheat, which may cause the danger of combustion and explosion. Therefore, the lithium iron phosphate battery pack needs a battery pack management system to complete functions such as balance control and management. At present, my country's research on the management of lithium iron phosphate battery packs is still focused on the application of electric vehicles, and the application research on coal mine rescue equipment has just started. Due to the complex environment in coal mines, the temperature management of the conventional battery management system cannot meet the particularity of the coal mine environment, and the accuracy of calculating the remaining capacity is difficult to meet the high safety requirements of mine power lithium batteries, and the safe charging of battery packs cannot be realized. Discharge control is difficult to apply to power lithium battery packs used in more downhole environments.

Utility model content

The technical problem to be solved by the utility model is to provide a mining power supply device based on a lithium iron phosphate battery that can prolong the service life of the battery pack, improve the energy efficiency of the battery pack, efficiently manage the battery pack, balance the battery control, be safe and reliable, and provide stable power supply .

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A mining power supply device based on a lithium iron phosphate battery, comprising a lithium iron phosphate battery unit, a data acquisition module, a main control module, a fault alarm module and a charger, the data acquisition module including a voltage sensor, a current sensor and a temperature sensor, The voltage sensor and the current sensor are respectively connected to the lithium iron phosphate battery unit, the temperature sensor is arranged on the casing of the lithium iron phosphate battery unit, the main control module is connected to the lithium iron phosphate battery unit through a charger, and the The voltage sensor detects the output voltage of the lithium iron phosphate battery unit and outputs it to the main control module, the current sensor detects the output current of the lithium iron phosphate battery unit and outputs it to the main control module, and the temperature sensor detects the temperature of the lithium iron phosphate battery unit. The body temperature is output to the main control module, and the main control module controls the working status of the fault alarm module and the charger according to the input voltage, current and box temperature.

As a further improvement of the above technical solution:

The mine power supply device also includes a remote communication port for communicating with the upper computer, and the remote communication port is connected with the main control module.

The remote communication port is an RS485 interface.

The lithium iron phosphate battery unit includes multiple battery packs connected in parallel, and the battery pack includes multiple lithium iron phosphate battery cells connected in series.

The battery pack also includes an equalization circuit for controlling the discharge state of the lithium iron phosphate battery cell according to the turn-on voltage, the equalization circuit corresponds to the lithium iron phosphate battery cell one by one, and any one of the equalization circuits corresponds to the corresponding iron phosphate battery cell. Lithium batteries are single-cell connected.

The lithium iron phosphate battery unit includes an overvoltage protection circuit and an overcurrent protection circuit, and the overvoltage protection circuit and the overcurrent protection circuit are respectively connected to each battery pack.

The utility model has the following advantages:

1. The lithium iron phosphate battery unit of the utility model uses a non-combustible and non-explosive lithium iron phosphate battery as the power supply energy, which meets the safety requirements of special occasions such as underground, and has the advantages of safety and reliability.

2. The voltage sensor of the utility model detects the output voltage of the lithium iron phosphate battery unit and outputs it to the main control module, the current sensor detects the output current of the lithium iron phosphate battery unit and outputs it to the main control module, and the temperature sensor detects the voltage of the lithium iron phosphate battery unit. The temperature of the box is output to the main control module. The main control module controls the working status of the fault alarm module and the charger according to the input voltage, current, and box temperature. It adopts an efficient battery pack management system to complete the balance control and extend the use of the battery pack. It has practical significance for the safety, reliability and stable production of coal mines.

3. The data acquisition module of the utility model includes a voltage sensor, a current sensor and a temperature sensor. The main control module uses DSP as the main controller and a dedicated chip to collect the voltage and current of the battery cell and the temperature data of the box to meet the high precision requirements.

4. The utility model further includes a remote communication port for communicating with the upper computer, through which the monitoring of the health status of the battery, the prediction of battery failure, and the realization of early warning and alarm of the battery system can be completed through the upper computer.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of a frame structure of an embodiment of the utility model.

FIG. 2 is a schematic diagram of the circuit principle of the equalization circuit in the embodiment of the present invention.

FIG. 3 is a schematic diagram of the circuit principle of the overvoltage protection circuit and the overcurrent protection circuit (the protection circuit in FIG. 1 ) in the embodiment of the utility model.

Legend: 1. Lithium iron phosphate battery unit; 11. Battery pack; 2. Data acquisition module; 3. Main control module; 31. Remote communication port; 4. Fault alarm module; 5. Charger.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, so as to make a clearer definition of the protection scope of the utility model.

As shown in Figure 1, the mine power supply device based on lithium iron phosphate battery in this embodiment includes lithium iron phosphate battery unit 1, data acquisition module 2, main control module 3, fault alarm module 4 and charger 5, data acquisition module 2 It includes a voltage sensor, a current sensor and a temperature sensor. The voltage sensor and the current sensor are respectively connected to the lithium iron phosphate battery unit 1. The temperature sensor is set on the box of the lithium iron phosphate battery unit 1. The main control module 3 is connected to the phosphoric acid battery through the charger 5. The lithium iron phosphate battery unit 1 is connected, the voltage sensor detects the output voltage of the lithium iron phosphate battery unit 1 and outputs it to the main control module 3, the current sensor detects the output current of the lithium iron phosphate battery unit 1 and outputs it to the main control module 3, and the temperature sensor detects The box temperature of the lithium iron phosphate battery unit 1 is output to the main control module 3, and the main control module 3 controls the working status of the fault alarm module 4 and the charger 5 according to the input voltage, current, and box temperature.

In this embodiment, the lithium iron phosphate battery unit 1 includes three battery packs 11 connected in parallel, and the battery pack 11 includes 12 lithium iron phosphate battery cells connected in series, with a total capacity of about 120V, meeting the requirements of specific loads. In this embodiment, the battery pack 11 also includes an equalization circuit for controlling the discharge state of the lithium iron phosphate battery cell according to the turn-on voltage, the equalization circuit is in one-to-one correspondence with the lithium iron phosphate battery cell, and any equalization circuit corresponds to the corresponding Lithium iron phosphate batteries are single-cell connected. The equalization circuit adopts distributed control. Each lithium iron phosphate battery cell is equipped with an equalization circuit. The opening voltage of the equalization circuit is specified and the equalization current is unified. When the voltage of the single-cell lithium iron phosphate battery reaches the opening voltage, the equalization circuit is connected to the iron phosphate The single cell of the lithium battery is discharged with a small current, otherwise the equalization circuit is disconnected. Since the charge and discharge of each single cell of the lithium iron phosphate battery is independent, the balance and stability of the final charge and discharge of the battery pack 11 are guaranteed.

As shown in FIG. 2 , the equalization circuit of this embodiment is realized by means of energy transfer, and the inductor L1 , the fast recovery diode D1 and the power switch S1 form a basic equalization circuit. E1-E12 are 12 battery cells in the battery pack 11, and the balancing circuit is connected in parallel to the battery cells E _y for balancing E _y . When the battery pack is charging, the current at both ends is I1, and the equalization circuit does not work in the case of equalization charging. If the terminal voltage of E _y is significantly higher than that of other battery cells due to performance deterioration or other factors, S1 is controlled by the control unit according to a certain percentage. Empty ratio chopping. After entering the steady state, when S1 is turned on, the current I5 flowing through L1 and S1 increases linearly, and the energy storage of L1 increases. At this time, the current I4 flowing through the single-core E _y is no longer equal to the current I1 at both ends of the battery pack, but Part of it was diverted. Therefore, the growth of the single-core charging current is limited. In a chopping cycle, S1 is turned on for a period of time according to the duty ratio D and enters the off stage, the current flowing through L1 changes the path through D1 to I3 to charge a total of m+1 single cores from Ex to Ex+m, that is, the inductance The energy storage is transferred to other single cores without affecting the charging current of Ey, and the charging current of Ey is restored to I1, which is equal to the current at both ends of the battery pack, completing the balancing function.

In this embodiment, the lithium iron phosphate battery unit 1 includes a protection circuit (that is, an overvoltage protection circuit and an overcurrent protection circuit), and the overvoltage protection circuit and the overcurrent protection circuit are connected to each battery pack respectively, and have overcharge protection, overdischarge protection, and overcharge protection. The function of protection and short circuit protection can prevent accidents.

As shown in Figure 3, the overvoltage protection circuit is realized by the CN3060 chip. The 6-pin and 10-pin of the CN3060 chip are connected to the positive electrode, the 2-pin and 3-pin are grounded, and the 4-pin, 5-pin, 8-pin, and 9-pin are connected to VCC; The current protection circuit (short circuit protection circuit) is realized by FS326 chip. The 2 pins of the FS326 chip are connected to the negative electrode, the 5 pins are connected to the positive electrode, the 6 pins are respectively connected to the positive electrode and the drain of the power tube M2, and the 1 pin and 3 pin Connect to the gates of power tubes M1 and M2 respectively; when it is detected that the voltage of pin 2 of the FS326 chip is greater than the built-in fixed voltage, it means that the discharge current is too large. Protect the battery.

In this embodiment, the data acquisition module 2 includes a voltage sensor, a current sensor and a temperature sensor. In this embodiment, the voltage sensor and the current sensor are realized based on the LTC6802 chip, which is a battery management chip and has a temperature sensor input, a 12-bit ADC and a Accurate voltage reference, able to measure 12 single cells, can achieve 0.12% (at room temperature) and 0.22% (-40°C-85°C) accuracy, can withstand 60V voltage, fully adapt to the high common voltage of the battery pack In order to detect the current and voltage of the cells in the lithium iron phosphate battery unit 1 box through the LTC6802 chip; the temperature sensor uses a DS18B20 chip to detect the temperature of the box. The DS18B20 chip is a digital temperature sensor that can meet In special applications such as mines, there is a requirement for battery temperature measurement accuracy.

In this embodiment, the main control module 3 is implemented by a DSP chip of the type TMS320F2812. The TMS320F2812 chip is integrated with a CAN controller and interface for completing communication with the data acquisition module. At the same time, the TMS320F2812 chip is expanded with RS485 communication The purpose of the interface is to communicate with external devices and realize data exchange. The mine power supply device of this embodiment also includes a remote communication port 31 for communicating with the host computer, and the remote communication port 31 is connected with the main control module 3 . In this embodiment, the remote communication port 31 is an RS485 interface, which is specifically realized based on the externally expanded RS485 communication interface of the TMS320F2812 chip. The main control module 3 can communicate with the upper computer (industrial computer) through the remote communication port 31, so that remote monitoring and control can be realized conveniently, and the use is more convenient.

In this embodiment, the failure alarm module 4 is specifically a buzzer, and an alarm module including LED, voice, LCD, etc. or a combination of the above forms can be used as required.

In this embodiment, the charger 5 includes a casing and an internal charging circuit, and the charging circuit is connected to each lithium iron phosphate battery cell to charge each lithium iron phosphate battery cell individually.

In the working process of this embodiment, the current sensor detects the output current of the lithium iron phosphate battery unit 1 and outputs it to the main control module 3, and the temperature sensor detects the temperature of the box body of the lithium iron phosphate battery unit 1 and outputs it to the main control module 3. The control module 3 analyzes and processes according to the input voltage, current, box temperature and estimates the SOC of the battery. If an abnormality occurs, the fault alarm module 4 is controlled to send an alarm. If the lithium iron phosphate battery unit 1 is too low, the charger 5 is controlled to start Each lithium iron phosphate battery cell in each battery pack 11 of the lithium iron phosphate battery unit 1 is charged.

The above descriptions are only preferred implementations of the present utility model, and the scope of protection of the present utility model is not limited to the above-mentioned implementations. All technical solutions belonging to the principle of the utility model belong to the protection scope of the utility model. For those skilled in the art, some improvements and modifications made on the premise of not departing from the principle of the utility model, these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims (6)

1. mining supply unit based on ferric phosphate lithium cell, it is characterized in that: comprise ferric phosphate lithium cell unit (1), data acquisition module (2), main control module (3), fault alarm module (4) and charger (5), described data acquisition module (2) comprises voltage sensor, current sensor and temperature sensor, described voltage sensor, current sensor links to each other with ferric phosphate lithium cell unit (1) respectively, described temperature sensor is located on the casing of ferric phosphate lithium cell unit (1), described main control module (3) links to each other with ferric phosphate lithium cell unit (1) by charger (5), the output voltage of described voltage sensor senses ferric phosphate lithium cell unit (1) is also exported to main control module (3), described current sensor detects the output current of ferric phosphate lithium cell unit (1) and exports to main control module (3), described temperature sensor detects the spin manifold temperature of ferric phosphate lithium cell unit (1) and exports to main control module (3), and described main control module (3) is according to input voltage, electric current, the operating state of spin manifold temperature control fault alarm module (4) and charger (5).

2. the mining supply unit based on ferric phosphate lithium cell according to claim 1, it is characterized in that: described mining supply unit comprises that also described telecommunication port (31) links to each other with main control module (3) for the telecommunication port (31) that communicates with host computer.

3. the mining supply unit based on ferric phosphate lithium cell according to claim 2, it is characterized in that: described telecommunication port (31) is the RS485 interface.

4. according to claim 1 or 2 or 3 described mining supply units based on ferric phosphate lithium cell, it is characterized in that: described ferric phosphate lithium cell unit (1) comprises a plurality of battery pack (11) parallel with one another, and described battery pack (11) comprises a plurality of ferric phosphate lithium cell list cores of series connection.

5. the mining supply unit based on ferric phosphate lithium cell according to claim 4, it is characterized in that: described battery pack (11) also comprises for the equalizing circuit of controlling the discharge condition of ferric phosphate lithium cell list core according to cut-in voltage, described equalizing circuit is corresponding one by one with ferric phosphate lithium cell list core, and any one equalizing circuit is continuous with corresponding ferric phosphate lithium cell list core.

6. the mining supply unit based on ferric phosphate lithium cell according to claim 5; it is characterized in that: described ferric phosphate lithium cell unit (1) comprises overvoltage crowbar and current foldback circuit, and described overvoltage crowbar links to each other with each battery pack (11) respectively with current foldback circuit.

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