CN112864479B - Rail transit lithium battery management system and battery system - Google Patents
Rail transit lithium battery management system and battery system Download PDFInfo
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- CN112864479B CN112864479B CN201911101581.7A CN201911101581A CN112864479B CN 112864479 B CN112864479 B CN 112864479B CN 201911101581 A CN201911101581 A CN 201911101581A CN 112864479 B CN112864479 B CN 112864479B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a rail transit lithium battery management system which comprises a signal acquisition control unit and a network interface unit, wherein the signal acquisition control unit and the network interface unit are in communication connection, the signal acquisition control unit comprises a control module, a power supply circuit, a multi-path analog input circuit, a digital output circuit and a multi-path communication interface, the network interface unit comprises a storage module and a train network interface, and the train network interface is used for being in communication connection with a train network. The invention also discloses a rail transit lithium battery system, which comprises a battery pack, a charger module and a battery management system; the output end of the battery pack is connected with a power circuit of the signal acquisition control unit through a DC/DC power module; the multi-channel analog input circuit in the signal acquisition control unit is connected with the battery pack and used for acquiring the state information of the battery pack; and the control module of the signal acquisition control unit is connected with the charger module through an interface and is used for carrying out charge and discharge control according to the state information of the battery pack. The system has the advantages of simple structure, intellectualization, strong anti-interference performance, rich functions and the like.
Description
Technical Field
The invention mainly relates to the technical field of lithium battery management, in particular to a lithium battery management system and a battery system for rail transit.
Background
In recent years, with the research and breakthrough of lithium battery technology, the lithium battery has good advantages such as: high energy density, long cycle life, light weight, small pollution and the like, and is widely applied to electric tools, bicycles, motorcycles, UPS, portable electrical appliances and other equipment. In the field of rail transit, the storage batteries such as the original nickel-cadmium storage batteries and the original lead-acid storage batteries are slowly replaced to become mainstream energy storage batteries, and the storage batteries are different from the fields such as automobile electronics, and the storage batteries in the field of rail transit are larger in capacity, more in battery strings, high in total voltage up to 1800V, and more complex in working condition environment. Therefore, it is necessary to equip a battery management system with pertinence to effectively monitor, protect, balance energy, pre-alarm and the like the battery pack, and further improve the working efficiency and the service life of the battery pack; meanwhile, as a whole vehicle energy storage system, a battery system is integrated into a whole vehicle network, integration with an information system is realized, and the system is essential for promoting the intelligent development of trains, and no corresponding rail transit lithium battery management system exists at present.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a lithium battery management system and a lithium battery system for rail transit, which are simple in structure, safe, reliable and intelligent.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a rail transit lithium battery management system comprises a signal acquisition control unit and a network interface unit which are connected in a communication manner, wherein the signal acquisition control unit comprises a control module, a power circuit, a multi-path analog input circuit, a digital output circuit and a multi-path communication interface, and the control module is respectively connected with the power circuit, the multi-path analog input circuit, the digital output circuit and the multi-path communication interface; the network interface unit comprises a storage module and a train network interface, the storage module is used for storing data, and the train network interface is used for being in communication connection with a train network.
As a further improvement of the above technical solution:
the analog input circuit comprises an interface protection unit, a proportion adjustment unit, an A/D conversion unit and a digital isolation unit; the interface protection unit, the proportion adjusting unit, the A/D conversion unit and the digital isolation unit are connected in sequence.
The interface protection unit comprises a transient diode and a clamping circuit, wherein the anode of the transient diode is grounded, the other end of the transient diode is connected with the input end of the analog input circuit, the clamping circuit comprises a constant voltage power supply, a first diode and a second diode, the anode of the first diode is connected with the input end, the other end of the first diode is connected with the constant voltage power supply, the cathode of the second diode is connected with the output end, and the anode of the second diode is grounded.
The multiple analog quantity input circuits are respectively a battery pack voltage input circuit, a battery pack current input circuit and a battery pack temperature input circuit.
The power supply circuit comprises more than one DC/DC module, and when the number of the DC/DC modules is multiple, the DC/DC modules are mutually connected in series to form multiple isolation protection and output voltages with different magnitudes.
The train network interface comprises an MVB interface and a real-time Ethernet interface, the control module is in communication connection with the train MVB network through the MVB interface, and the control module is in communication connection with the train real-time Ethernet through the real-time Ethernet interface.
The invention also discloses a rail transit lithium battery system, which comprises a battery pack, a charger module and the rail transit lithium battery management system; the output end of the battery pack is connected with a power circuit of the signal acquisition control unit through a DC/DC power module; the multi-channel analog input circuit in the signal acquisition control unit is connected with the battery pack and used for acquiring the state information of the battery pack; and the control module of the signal acquisition control unit is connected with the charger module through an interface and is used for carrying out charge and discharge control according to the state information of the battery pack.
As a further improvement of the above technical solution:
the device also comprises an insulation monitoring device, a battery state data recorder and a single battery control unit; the control module is connected with the insulation monitoring device through an interface and is used for monitoring the ground state information and the insulation state information of the battery pack; the control module is connected with the single battery control unit through an interface and used for acquiring the state information of the single battery; the control module is connected with the battery state data recorder through an interface and used for recording the real-time state information of the battery pack.
The battery pack temperature acquisition device is characterized by further comprising a voltage sensor for acquiring battery pack voltage, a current sensor for acquiring battery pack current and a temperature sensor for acquiring battery pack temperature, wherein the voltage sensor, the current sensor and the temperature sensor are respectively connected with the analog input circuit correspondingly, and power ends of the voltage sensor, the current sensor and the temperature sensor are connected with the power circuit.
The network interface unit is connected with the remote monitoring unit through a real-time Ethernet of the train and is used for remote monitoring; and the network interface unit is connected with the display unit through a train MVB network and is used for displaying the state information of the battery pack.
Compared with the prior art, the invention has the advantages that:
the battery management system and the battery system are applied to the current rail transit battery pack, and have simple integral structure; the network interface unit is communicated with a train network, so that the battery management system and the rail transit information system are integrated, and the operation reliability and the intelligence of the management system are improved. By carrying out isolation design on each circuit in the information acquisition control unit, the whole management system has strong anti-interference performance. The system has abundant acquisition interfaces, can acquire various sensor signals such as voltage, current, temperature and the like, and can provide various power supplies for the sensors; relays/contactors capable of driving various types of loads; possess multiple communication interface, can select according to on-the-spot actual demand, the practicality is strong.
Drawings
Fig. 1 is a block configuration diagram of an embodiment of the management system of the present invention.
Fig. 2 is a block diagram of a signal acquisition control unit according to an embodiment of the present invention.
Fig. 3 is a block diagram of a network interface unit according to an embodiment of the present invention.
Fig. 4 is a block diagram of an analog input circuit according to an embodiment of the present invention.
Fig. 5 is a circuit schematic diagram of a digital output circuit according to an embodiment of the present invention.
Fig. 6 is a circuit schematic diagram of a digital input circuit according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a battery system according to an embodiment of the present invention.
The reference numbers in the figures denote: 1. a signal acquisition control unit; 2. and a network interface unit.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1, the lithium battery management system for rail transit in the embodiment includes a signal acquisition control unit 1 and a network interface unit 2, which are connected in communication, where the signal acquisition control unit 1 includes a control module, a power circuit, a multi-channel analog input circuit, a digital output circuit, and a multi-channel communication interface, and the control module is connected to the power circuit, the multi-channel analog input circuit, the digital output circuit, and the multi-channel communication interface, respectively; the network interface unit 2 comprises a storage module and a train network interface, the storage module is used for storing data, and the train network interface is used for being in communication connection with a train network.
The rail transit lithium battery management system of this embodiment, specifically be applied to rail transit technical field, because the group battery is capacious, belong to high-voltage system, need keep apart with the weak current system of locomotive control, the event has all carried out corresponding isolation design to power supply circuit, analog input circuit, digital output circuit and communication interface etc. to solve and keep apart withstand voltage problem, make whole management system interference killing feature strong, do following explanation with regard to the relevant isolation design of each circuit respectively:
1) a power supply circuit: as shown in fig. 2 and 7, the input end of the power circuit is connected to the battery pack, the output voltage of the battery pack is converted into DC24V through the DC/DC power supply, a primary isolation conversion from high voltage to 24V is completed, and then the isolation conversion is performed through the DC/DC module in the power circuit to 5V, so as to realize at least secondary isolation. Of course, the power supply can be selected from 9-36V according to actual conditions.
2) The multi-channel analog input circuit is respectively a battery pack voltage input circuit, a battery pack current input circuit and a battery pack temperature input circuit; as shown in fig. 4, each analog input circuit includes an interface protection unit, a ratio adjustment unit, an a/D conversion unit, and a digital isolation unit, which are connected in sequence. The interface protection unit comprises a transient diode and a clamping circuit, the anode of the transient diode is grounded, the other end of the transient diode is connected with the input end of the analog input circuit, the clamping circuit comprises a constant voltage power supply, a first diode and a second diode, the anode of the first diode is connected with the input end, the other end of the first diode is connected with the constant voltage power supply, the cathode of the second diode is connected with the output end, and the anode of the second diode is grounded. When the current is collected, the current (0-200 mA) is collected through a precision resistor to complete current/voltage conversion, then a proportion adjusting unit is used for adjusting signals to 0-10V/0-5V, an A/D converting unit is used for performing digital-to-analog conversion, and then a digital isolating unit is used for isolating and then sending the signals to a control module. In the analog input circuit, the interface protection is carried out through the transient diode and the clamping circuit, and the isolation of the digital isolation chip is matched, so that the double isolation is realized. Of course, the acquisition of each signal is acquired through a corresponding sensor, and the sensor has a high-voltage isolation function.
3) Digital quantity output circuit: as shown in fig. 5, the MOSFET driving output circuit and the relay driving output circuit are included, and the control module (such as the MCU in fig. 2) controls the output of the corresponding contactor/relay load according to the on-line status of the battery pack, so as to control the battery. Specifically, the MOSFET driving output circuit comprises an optical coupling isolation unit, a MOSFET tube and two transient diodes, wherein the cathode of one transient diode is connected with the grid electrode of the MOSFET tube, the cathode of the transient diode is connected with the ground, the cathode of the other transient diode is connected with the drain electrode of the MOSFET tube, and the other end of the transient diode is connected with the source electrode of the MOSFET tube. Through the arrangement of the transient diode and the optical coupling isolation unit, the output isolation can be realized. The relay drive output circuit drives the relay coil through the triode and can also carry out output isolation.
The parameters of the digital output circuit are shown in table 1:
table 1: switching value output parameter
4) Digital quantity input circuit
As shown in fig. 6, the feedback contact state of the battery pack control assembly, the power supply operating state of each related component, and the like are collected and sent to the MCU to complete corresponding protection and control, wherein the digital input circuit is also provided with an opto-coupler isolation unit to achieve input isolation, and the circuit parameters are as shown in table 2:
table 2: switching value input circuit parameter
| Serial number | Parameter(s) | Data of | Unit of |
| 1 | Logic 0 | ＜8 | |
| 2 | Logic 1 | ＞15 | V |
| 3 | Input-output isolation voltage | 1000 | V |
| 4 | Actual operating current | Less than or equal to 10mA (conventional + capacitor) | mA |
| 6 | Input turn-on delay | ≤10ms | ms |
| 7 | Input disconnect delay | ≤2.5 | ms |
| 8 | Surge (chopping) | Line 500(1.25/25 mus) | V (Standard) |
Through the isolation design of the input and the output of each circuit, the whole management system has strong anti-interference capability and is suitable for rail transit vehicles.
In this embodiment, the storage module in the signal acquisition control unit 1 records and stores the key data, has a storage capacity of 2GB, and the storage time can reach 1 month; the train network interface comprises an MVB interface and a real-time Ethernet interface, the control module is in communication connection with the train MVB network through the MVB interface, the control module is in communication connection with the real-time Ethernet of the train through the real-time Ethernet interface and transmits data to the ground server at regular time, data analysis is carried out through vehicle-mounted TPU software, the waveform of data of the front section and the rear section of a fault moment can be analyzed, the state of the full life cycle of the battery system is recorded, and the method has important significance for research of the power battery system technology.
In this embodiment, the signal acquisition control unit 1 and the network interface unit 2 both adopt independent single board structures, such as the acquisition control single board and the communication interface single board in fig. 1, which may be stacked and installed during installation, wherein the acquisition control single board is used for information acquisition and state control, and has a high real-time requirement, and an individual processor is selected, for example, an S32 single chip microcomputer of NXP is selected as a control module, which has low power consumption, multiple communication interfaces (such as CAN interface, RS485, etc.) and strong processing capability, and CAN achieve the authentication of the secure ASILB, and certainly, other similar single chip microcomputers or processors may be used for substitution; the communication interface single board mainly has the functions of recording, storing, uploading network and the like of key information, and can adopt a PowerPC chip MPC5125 or other similar chips.
The management system of the invention has abundant acquisition interfaces, can acquire various sensor signals such as voltage, current, temperature and the like, and can provide various power supplies such as +/-15V/+ 5V and the like for the sensors; relays/contactors capable of driving various types of loads; possess multiple communication interface (including 1 way CAN bus, 1 way RS485 bus, 1 way MVB bus, 2 way real-time ethernet etc.), CAN select according to on-the-spot actual demand, the practicality is strong.
As shown in fig. 7, the invention also discloses a rail transit lithium battery system, which comprises a battery pack, a charger module and the rail transit lithium battery management system; the output end of the battery pack is connected with a power circuit of the signal acquisition control unit 1 through a DC/DC power module; the multi-channel analog input circuit in the signal acquisition control unit 1 is connected with the battery pack and is used for acquiring the state information of the battery pack; the control module of the signal acquisition control unit 1 is connected with the charger module through an interface and is used for carrying out charge and discharge control according to the state information of the battery pack.
In this embodiment, the communication interface in the rail transit lithium battery management system includes a CAN1-4 interface and an RS485 interface, where the communication interface is connected to the cell control unit through a CAN1 interface, and collects state information of the cell, such as voltage, current, temperature, SOC state of the cell; the device is connected with an insulation monitoring device through a CAN2 interface, and is used for monitoring the ground state information and the insulation state of the battery pack and well performing safety protection; the CAN3 interface is connected with a battery state data recorder to record the real-time state information of the battery pack and download and analyze the information at regular intervals; the CAN network is connected with the whole vehicle CAN network through a CAN4 interface to be used as a backup CAN network; and the charging/discharging control is finished according to the acquired state information of the battery pack and a set control strategy by connecting the RS485 interface with a charger module.
In this embodiment, the battery pack further includes a voltage sensor for collecting a voltage of the battery pack, a current sensor for collecting a current of the battery pack, and a temperature sensor for collecting a temperature of the battery pack, wherein the voltage sensor, the current sensor, and the temperature sensor are respectively connected to the corresponding analog input circuit, and power terminals of the voltage sensor, the current sensor, and the temperature sensor are connected to the power circuit, that is, the isolated power is provided for each sensor by the isolated power.
In the embodiment, the battery pack is connected with a train MVB network through an MVB interface, the whole battery system is integrated into the whole train MVB network, various information of the battery pack is uploaded and integrated into a rail transit information system for IDU display, pre-alarming and the like; the real-time Ethernet of the train is accessed through an Ethernet interface, and a TRDP protocol is transmitted to be used as backup and redundancy of an MVB network and used for PTU, remote monitoring and the like. In addition, the real-time Ethernet has at least two paths, supports a TRDP protocol, can transmit data to a ground server at regular time through an Ethernet interface, performs data analysis through vehicle-mounted TPU software, can record waveforms of data of the front and rear sections of a fault moment and record the state of the full life cycle of the battery system, and has important significance for the research of the power battery system technology.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (7)
1. A lithium battery management system for rail transit is characterized by comprising a signal acquisition control unit (1) and a network interface unit (2) which are connected in a communication mode, wherein the signal acquisition control unit (1) comprises a control module, a power circuit, a multi-path analog input circuit, a digital output circuit and a multi-path communication interface, and the control module is respectively connected with the power circuit, the multi-path analog input circuit, the digital output circuit and the multi-path communication interface; the network interface unit (2) comprises a storage module and a train network interface, wherein the storage module is used for storing data, and the train network interface is used for being in communication connection with a train network;
the analog input circuit comprises an interface protection unit, a proportion adjustment unit, an A/D conversion unit and a digital isolation unit; the interface protection unit, the proportion adjusting unit, the A/D conversion unit and the digital isolation unit are sequentially connected;
the interface protection unit comprises a transient diode and a clamping circuit, wherein the anode of the transient diode is grounded, the other end of the transient diode is connected with the input end of the analog input circuit, the clamping circuit comprises a constant voltage power supply, a first diode and a second diode, the anode of the first diode is connected with the input end, the other end of the first diode is connected with the constant voltage power supply, the cathode of the second diode is connected with the output end, and the anode of the second diode is grounded;
the power supply circuit comprises more than one DC/DC module, and when the number of the DC/DC modules is multiple, the DC/DC modules are mutually connected in series to form multiple isolation protection and output voltages with different sizes;
the digital quantity output circuit comprises an MOSFET drive output circuit and a relay drive output circuit, and the control module controls the output of the corresponding relay load according to the online state of the battery pack to control the battery; specifically, the MOSFET driving output circuit comprises an optical coupling isolation unit, a MOSFET tube and two transient diodes, wherein the cathode of one transient diode is connected with the grid electrode of the MOSFET tube, the anode of the transient diode is connected with the ground, the cathode of the other transient diode is connected with the drain electrode of the MOSFET tube, and the anode of the transient diode is connected with the source electrode of the MOSFET tube; wherein the relay drive output circuit drives the relay coil through the triode.
2. The lithium battery management system for rail transit as claimed in claim 1, wherein the analog input circuits are a battery voltage input circuit, a battery current input circuit and a battery temperature input circuit.
3. The lithium battery management system for rail transit according to claim 1 or 2, wherein the train network interface comprises an MVB interface and a real-time Ethernet interface, the control module is in communication connection with the MVB network of the train through the MVB interface, and the control module is in communication connection with the real-time Ethernet of the train through the real-time Ethernet interface.
4. A rail transit lithium battery system comprises a battery pack and a charger module, and is characterized by further comprising the rail transit lithium battery management system as claimed in any one of claims 1 to 3; the output end of the battery pack is connected with a power circuit of the signal acquisition control unit (1) through a DC/DC power module; a multi-channel analog input circuit in the signal acquisition control unit (1) is connected with the battery pack and is used for acquiring the state information of the battery pack; and the control module of the signal acquisition control unit (1) is connected with the charger module through a communication interface and is used for carrying out charge and discharge control according to the state information of the battery pack.
5. The rail transit lithium battery system of claim 4, further comprising an insulation monitoring device, a battery state data recorder, and a cell control unit; the control module is connected with the insulation monitoring device through an interface and is used for monitoring the ground state information and the insulation state information of the battery pack; the control module is connected with the single battery control unit through an interface and used for acquiring the state information of the single battery; the control module is connected with the battery state data recorder through an interface and used for recording the real-time state information of the battery pack.
6. The rail transit lithium battery system of claim 4 or 5, further comprising a voltage sensor for collecting battery pack voltage, a current sensor for collecting battery pack current and a temperature sensor for collecting battery pack temperature, wherein the voltage sensor, the current sensor and the temperature sensor are respectively connected with the corresponding analog input circuit, and power supply ends of the voltage sensor, the current sensor and the temperature sensor are connected with the power supply circuit.
7. The rail transit lithium battery system according to claim 4 or 5, further comprising a remote monitoring unit and a display unit, wherein the network interface unit (2) is connected with the remote monitoring unit through a real-time Ethernet of a train for remote monitoring; and the network interface unit (2) is connected with the display unit through a train MVB network and is used for displaying the state information of the battery pack.
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