CN113320555A - High-isolation and voltage-withstanding battery management system for rail transit - Google Patents
High-isolation and voltage-withstanding battery management system for rail transit Download PDFInfo
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- CN113320555A CN113320555A CN202110416183.5A CN202110416183A CN113320555A CN 113320555 A CN113320555 A CN 113320555A CN 202110416183 A CN202110416183 A CN 202110416183A CN 113320555 A CN113320555 A CN 113320555A
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- 238000002955 isolation Methods 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 claims description 23
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000001143 conditioned effect Effects 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C3/00—Electric locomotives or railcars
- B61C3/02—Electric locomotives or railcars with electric accumulators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention belongs to the technical field of rail transit, and relates to a high-isolation and pressure-resistant battery management system for rail transit. The method comprises the following steps: the system comprises a main board, a plurality of slave boards and a plurality of acquisition boards; the master board and the slave boards are in communication connection through a CAN bus, and each slave board is in communication connection with the acquisition boards through a daisy chain bus; each collecting plate is connected with one battery module; the method comprises the following steps that a mainboard acquires battery parameter data of a slave plate through a CAN bus; each slave board acquires battery parameter data of the acquisition board through a daisy chain bus; each acquisition board is responsible for acquiring the voltage and temperature parameters of the battery of the corresponding battery module and transmitting the parameters to the slave board through the daisy chain bus. The battery management system with the three-level architecture is adopted, so that the circuit design of the slave board and the acquisition board can be simplified, and the hardware cost is obviously reduced; the high-voltage side and the low-voltage side are electrically isolated by combining digital isolation and analog isolation, so that the isolation and voltage-withstanding capability of the system is greatly improved.
Description
Technical Field
The invention belongs to the technical field of rail transit, and relates to a high-isolation and pressure-resistant battery management system for rail transit.
Background
The lithium titanate battery has the characteristics of high safety coefficient, good wide-temperature performance, long cycle life and the like, and is widely applied to rail transit at present. The lithium titanate battery needs to be equipped with a battery management system for use, and parameters such as voltage, temperature and the like of the lithium titanate battery are monitored in real time through the battery management system, so that maintenance-free performance of the lithium titanate battery in the life cycle is achieved. According to application requirements, lithium titanate batteries are generally divided into power supplies and auxiliary power supplies, the rated voltage of the current power supply reaches 1500V-1800V at most, and future voltage grades are expected to be higher. The higher the rated voltage of the equipment is, the higher the requirement on the isolation and voltage resistance of the equipment is; in GB/T21413.1-2008 railway applications locomotive vehicle electrical equipment part 1: general conditions of use and general rules are explicitly specified in the section: for equipment with rated voltage greater than 1200V, the isolation withstand voltage index of 2U +2000V (U is the rated voltage value of the equipment) needs to be met.
The conventional battery management system for rail transit generally adopts a master-slave architecture, namely a slave board MCU is connected with one or more front end acquisition chips (AFEs) through board-level SPI signals to acquire voltage and temperature data of a battery; the master board and the slave board carry out information interaction through the CAN bus. In order to meet the isolation voltage-withstand index, a digital isolator chip integrated with a power supply is usually added between an MCU (microprogrammed control Unit) and an AFE (automatic Power supply) for electrical isolation, the voltage-withstand value of the device in the market is only 5000V at most at present, the isolation voltage-withstand requirement of 1500V-1800V voltage equipment is barely met, and if the voltage grade of the equipment is higher, the isolation voltage-withstand requirement cannot be met only by relying on the digital isolator chip.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problem that the master-slave secondary architecture of the conventional battery management system for rail transit cannot meet the isolation and voltage-withstanding requirements of equipment with higher voltage class, and the brief description of the solution is as follows: adopt the battery management system of mainboard, slave plate, three grade frameworks of collection board to solve above-mentioned problem, specific technical scheme is as follows:
a high-isolation and voltage-withstanding battery management system for rail transit comprises: a main board (also called a BCU (Battery Control Unit)), a plurality of slave boards (also called a BMU (Battery Management Unit)), and a plurality of collection boards (also called a BAU (Battery Acquisition Unit));
the main board is in communication connection with the slave boards through a CAN bus, and each slave board is in communication connection with the acquisition boards through a daisy chain (isoSPI) bus; each collecting plate is connected with one battery module (namely one collecting plate corresponds to one battery module);
the mainboard is used for: managing a plurality of slave plates, and acquiring battery parameter data of the slave plates through a CAN bus;
each slave plate is used for: managing a plurality of acquisition boards (also called acquisition board nodes) on the corresponding daisy chain bus, and acquiring battery parameter data of the acquisition boards through the daisy chain bus;
each collection plate is used for: collecting voltage and temperature parameters of a battery corresponding to the battery module, and transmitting the voltage and temperature parameters to the slave plate through the daisy chain bus;
one slave board corresponds to one daisy chain bus.
On the basis of the above technical solution, the main board includes: a main board MCU (micro control unit) module, a main board DC/DC (direct current to direct current) power module, an input detection module, an output control module, a current acquisition module (also known as current detection), a voltage acquisition module (also known as voltage detection) and a main board CAN interface module;
the mainboard DC/DC power supply module, the input detection module, the current acquisition module, the voltage acquisition module, the output control module and the mainboard CAN interface module are all connected with the mainboard MCU module;
the mainboard DC/DC power supply module is connected with the input detection module, the current acquisition module, the voltage acquisition module, the output control module, the mainboard CAN interface module and the mainboard MCU module;
the mainboard DC/DC power module is used for: the power supply module supplies power to the input detection module, the current acquisition module, the voltage acquisition module, the output control module, the mainboard CAN interface module and the mainboard MCU module;
the input detection module is configured to: the electric isolation and the level detection of the input signal are realized through the optical coupler;
the input signal includes: a digital input signal (i.e., a DI signal);
the output control module is used for: the electrical isolation and the on-off control of output signals are realized through the relay;
the output signal includes: a digital output signal (i.e., a DO signal);
the current acquisition module is used for: after a small current signal returned by the Hall sensor is conditioned to a proper range, the small current signal is transmitted to an AD (analog-digital) channel pin arranged on a mainboard MCU module;
the current signal includes: bus current;
the voltage acquisition module is used for: detect bus voltage to with the voltage value transfer to mainboard MCU module, specifically be: acquiring a small current signal through a Hall sensor, converting the small current signal into a voltage signal through a conditioning circuit, and finally transmitting the voltage signal to an AD channel pin arranged on a mainboard MCU module;
the mainboard CAN interface module is used for: realize electrical isolation and CAN bus communication.
On the basis of the technical scheme, the slave plate comprises: the slave board MCU module, the slave board DC/DC power module, the slave board CAN interface module and the daisy chain interface module;
the slave plate DC/DC power supply module, the slave plate CAN interface module and the daisy chain interface module are all connected with the slave plate MCU module;
the slave DC/DC power supply module is connected with the slave CAN interface module, the daisy chain interface module and the slave MCU module;
the slave DC/DC power supply module is used for: power is supplied to the slave plate CAN interface module, the daisy chain interface module and the slave plate MCU module;
the slave CAN interface module is used for: realizing electrical isolation;
the daisy chain interface module is configured to: daisy chain bus communication is achieved.
On the basis of the above technical solution, the main board DC/DC power module includes: the isolated DC-DC power supply module is characterized by comprising a 110V-to- +/-15V isolated DC-DC power supply module and a mainboard 110V-to-5V isolated DC-DC power supply module;
the 110V-to- +/-15V isolated DC-DC power supply module is used for: supplying power to the voltage acquisition module and the current acquisition module;
the isolated DC-DC power supply module for converting the main board 110V into the 5V is used for: and power is supplied to the input detection module, the output control module, the mainboard CAN interface module and the mainboard MCU module.
The slave DC/DC power supply module is as follows: 110V changes 5V isolated DC-DC power module.
On the basis of the technical scheme, the mainboard CAN interface module comprises: a motherboard digital isolator and a motherboard CAN transceiver;
the mainboard digital isolator is connected with the mainboard CAN transceiver, the mainboard MCU module and the mainboard DC/DC power module; the mainboard CAN transceiver is in communication connection with the slave boards through a CAN bus;
the motherboard digital isolator is to: realizing electrical isolation;
the slave-board CAN interface module comprises: a slave digital isolator I and a slave CAN transceiver;
the first slave digital isolator is connected with the slave CAN transceiver, the slave MCU module and the slave DC/DC power module; the slave board CAN transceiver is in communication connection with the master board through a CAN bus;
the slave digital isolator one is used for: and realizing electrical isolation.
On the basis of the above technical solution, the daisy chain interface module includes: a slave plate digital isolator II, a slave plate daisy chain transceiver (also called as an isoSPI transceiver) and a slave plate signal transformer;
the slave plate digital isolator II is connected with the slave plate MCU module and the slave plate daisy chain transceiver; the slave plate daisy chain transceiver is connected with the slave plate signal transformer;
the slave digital isolator two is used for: digitally isolating and transmitting the signal to the daisy chain transceiver;
the slave board daisy chain transceiver is to: converting the signal sent by the slave plate digital isolator II into a differential signal and sending the differential signal to a slave plate signal transformer;
the slave board signal transformer is used for: and the analog isolation is realized, and the analog isolation is connected with a plurality of acquisition boards through a daisy chain bus.
On the basis of the technical scheme, a power converter is integrated in the slave plate digital isolator II;
the power converter is configured to: converting power from the slave DC/DC power supply module to power from the slave daisy-chain transceiver.
On the basis of the technical scheme, the collecting plate comprises: the device comprises a front-end acquisition chip, an acquisition board DC/DC power module and an acquisition board daisy chain interface module;
the collection board daisy chain interface module includes: a collection board signal transformer;
the front-end acquisition chip is connected with the acquisition board signal transformer, the acquisition board DC/DC power module and the battery module; the acquisition board DC/DC power module is connected with the battery module; the acquisition board signal transformer is connected with the slave board through a daisy chain bus;
the front-end acquisition chip is used for: collecting voltage and temperature parameters of a battery in the battery module;
the acquisition board signal transformer is used for: the electrical isolation is carried out, and the daisy chain bus is connected with the slave plate;
the acquisition board DC/DC power module is used for: and power is taken from the battery module, and after the voltage is converted, the power is supplied to the front-end acquisition chip.
On the basis of the technical scheme, the acquisition board gets electricity from the battery module, and for reducing the electricity consumption, only when the daisy chain bus has a communication task, the front-end acquisition chip controls the electricity enable EN pin arranged on the acquisition board DC/DC power module to be at a high level, and the acquisition board DC/DC power module normally works to supply power to the acquisition board.
On the basis of the technical scheme, a parallel matching resistor R1 is arranged on the front-end acquisition chip, and a parallel matching resistor R2 is arranged on the slave board daisy chain transceiver.
On the basis of the technical scheme, the master board MCU module and the slave board MCU module both adopt MPC5744 singlechips of NXP company;
the front-end acquisition chip can be selected from LTC6804-1 of Linear company supporting daisy chain communication;
the DC/DC power module of the acquisition board can be selected from LT3990 of Linear company, and the conversion efficiency is more than 85%.
On the basis of the technical scheme, both the master board digital isolator and the slave board digital isolator can adopt ISOW7821 of TI company;
the slave board daisy chain transceiver can be selected from LTC6820 of Linear company; the slave board signal transformer and the acquisition board signal transformer can both adopt HM2102NL of PULSE company;
the slave digital isolator II can be ISOW7841 of TI company.
On the basis of the technical scheme, the optocoupler can be selected from EL817 of Everlight company; the relay can be G6DN of OMRON company, and the rated current of the relay is 5A;
the parallel matching resistors R1 and R2 may be selected to have a resistance of 120 Ω.
On the basis of the above technical solution, each battery module includes: 12 strings of batteries.
The invention has the following beneficial technical effects:
1) the battery management system with a three-level architecture is adopted, so that the circuit design of the slave board and the acquisition board can be simplified, and the hardware cost is obviously reduced;
2) the high-voltage side and the low-voltage side are electrically isolated by combining digital isolation and analog isolation, so that the isolation and voltage-withstanding capability of the system is greatly improved.
Drawings
The invention has the following drawings:
fig. 1 is a schematic block diagram of a three-stage architecture of a high-isolation voltage-withstanding battery management system for rail transit according to the present application;
FIG. 2 is a schematic block diagram of a circuit principle of the motherboard according to the present application;
FIG. 3 is a schematic block diagram of the electrical schematic of the slave board of the present application;
FIG. 4 is a schematic block diagram of a circuit schematic of the acquisition board described herein;
fig. 5 is a schematic block diagram of an electrical isolation circuit of the high-isolation withstand voltage battery management system for rail transit.
Detailed Description
The invention is further described below with reference to examples and figures.
A high-isolation and voltage-withstanding battery management system for rail transit comprises: a master Board (BCU), a slave Board (BMU) and a collection Board (BAU); the battery management system adopts a three-level architecture. The master board and the slave board adopt CAN bus communication, the slave board and the acquisition board adopt daisy chain (isoSPI) bus communication, and the schematic block diagram of the architecture is shown in FIG. 1.
The functions of each unit in the three-level architecture are as follows:
the master board is responsible for managing a plurality of slave boards, and battery parameter data of the slave boards are obtained through the CAN bus; one slave board corresponds to one daisy chain bus, and each slave board is responsible for managing a plurality of acquisition board nodes (nodes for short) on the corresponding daisy chain bus. Battery parameter data of the nodes are obtained from the lower part of the slave board pair through a daisy chain bus, and the upper part of the slave board pair is communicated with the master board through a CAN bus; one collection plate corresponds to one battery module, that is, each collection plate is responsible for collecting the voltage and temperature parameters of 12 strings of batteries (namely 12 cells in fig. 1) of the corresponding battery module.
The unit circuits in the three-level architecture are as follows:
the main board is mainly composed of a main board MCU (MCU), a main board DC/DC power supply module, an input detection module (input detection), an output control module (output control), a current collection module (current detection), a voltage collection module (voltage detection), a CAN interface module and other module circuits, and a schematic circuit block diagram is shown in FIG. 2.
The mainboard MCU module selects an MPC5744 singlechip of NXP company; the main board DC/DC power module includes: the isolated DC-DC power supply module comprises an isolated DC-DC power supply module converting 110V to +/-15V and an isolated DC-DC power supply module converting 110V to 5V. The 110V-to- +/-15V isolated DC-DC power supply module is responsible for supplying power to a Hall voltage/current sensor (namely a Hall sensor), a voltage acquisition module and a current acquisition module, and the 110V-to-5V isolated DC-DC power supply module is responsible for supplying power to an input detection module, an output control module, a mainboard CAN interface module and a mainboard MCU module; the input detection module realizes electrical isolation and level detection of input signals through an optical coupler, and the optical coupler can be selected from EL817 of Everlight company; the output control module realizes electrical isolation and on-off control of output signals through a relay, the relay can select G6DN of an OMRON company, and the rated current is 5A; the current acquisition module conditions a small current signal returned by the Hall sensor to a proper range and then sends the signal to an AD channel pin of the mainboard MCU module; the CAN interface module realizes electrical isolation through a mainboard digital isolator, and the mainboard digital isolator CAN be ISOW7821 of TI company.
The slave board mainly comprises a slave board MCU module, a slave board DC/DC power supply module, a slave board CAN interface module, an isoSPI interface module and other module circuits, and a schematic block diagram of the circuit principle is shown in FIG. 3.
The slave MCU module selects an MPC5744 singlechip of NXP company; the slave DC/DC power supply module consists of a 110V-to-5V isolated DC-DC power supply module and is responsible for supplying power to the slave CAN interface module, the daisy chain interface module and the slave MCU module; the slave plate CAN interface module realizes electrical isolation through a slave plate digital isolator I, and the slave plate digital isolator I CAN select ISOW7821 of TI company; the isoSPI interface module is firstly subjected to digital isolation through a second slave board digital isolator, then is converted into differential signals from the isoSPI transceiver, and finally is subjected to analog isolation through a slave board signal transformer, the second slave board digital isolator can adopt ISOW7841 of TI company, the slave board isoSPI transceiver can adopt LTC6820 of Linear company, and the slave board signal transformer can adopt HM2102NL of PULSE company.
The acquisition board mainly comprises a front end acquisition chip (AFE), an acquisition board DC/DC power module, an isoSPI interface module and other module circuits, and a schematic block diagram of the circuit principle is shown in FIG. 4.
The AFE is responsible for collecting voltage and temperature parameters of the battery, the AFE can be selected from LTC6804-1 of Linear company to support daisy chain communication, an isoSPI interface can be obtained by electrically isolating an external collection board signal transformer, and the collection board signal transformer can be selected from HM2102NL of PULSE company; the acquisition board gets electricity from the battery module, in order to reduce power consumption, only when the daisy chain bus has a communication task, the AFE controls the power-on enable EN pin of the acquisition board DC/DC power module to be high level, the acquisition board DC/DC power module normally works to supply power to the acquisition board, the acquisition board DC/DC power module can select LT3990 of Linear company, and the conversion efficiency is more than 85%.
The three-level architecture battery management system can greatly improve the isolation voltage-withstanding capability of the system, can meet the isolation voltage-withstanding requirement of equipment with higher voltage class, and has the following specific principle:
the isoSPI interface of the slave board (i.e. the daisy chain interface module) adopts secondary electrical isolation (digital isolation + analog isolation), the isoSPI interface of the acquisition board adopts primary electrical isolation (analog isolation), and a schematic block diagram of a circuit principle of the isoSPI interface is shown in FIG. 5.
An SPI (serial peripheral interface) signal is output from an MCU module X6 of the slave plate, is subjected to digital isolation through a digital isolator X5 (namely, a slave plate digital isolator II), is connected to an isoSPI transceiver X4 (namely, a slave plate daisy chain transceiver) to obtain a differential signal, and is subjected to analog isolation through a signal transformer X3 (namely, a slave plate signal transformer) to obtain an isoSPI bus signal. After the isoSPI bus signals are subjected to analog isolation by a signal transformer X2 (namely, a signal transformer of the acquisition board), the signal transformer is connected to an AFE chip X1. R1 and R2 are set as matching resistors of the isoSPI bus, and 120 omega can be selected. The VCC (namely the slave board DC/DC power supply module) supplies power to the slave board MCU module X6 and the digital isolator X5, and the digital isolator X5 internally integrates a power converter to convert the VCC into an isolation voltage Viso and then supply power to the isoSPI transceiver X4.
A battery management system adopting a three-level framework passes through 2 signal transformers and 1 digital isolator from the high-voltage side of an acquisition board to the electric isolation link from the low-voltage side of a slave board, and the isolation voltage withstand value of the system is approximately equal to the sum of the voltage withstand values of the acquisition board, the slave board and the digital isolator. Since the isolation withstand voltage values of the signal transformer HM2102NL and the digital isolator ISOW7841 are 3100Vrms and 5000Vrms, respectively, the isolation withstand voltage value of the system is 3100 × 2+5000 — 11200 Vrms. From the isolation withstand voltage index formula, 11200 ═ 2U +2000, that is, U ═ 4600V was obtained. Therefore, the battery management system adopting the three-level architecture can meet the isolation withstand voltage requirement of equipment with rated voltage level of about 4600V.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and obvious variations and modifications may be made within the scope of the present invention.
Those not described in detail in this specification are within the knowledge of those skilled in the art.
Claims (10)
1. A high-isolation and pressure-resistant battery management system for rail transit is characterized by comprising: the system comprises a main board, a plurality of slave boards and a plurality of acquisition boards;
the master board is in communication connection with the slave boards through a CAN bus, and each slave board is in communication connection with the acquisition boards through a daisy chain bus; each collecting plate is connected with one battery module;
the mainboard is used for: managing a plurality of slave plates, and acquiring battery parameter data of the slave plates through a CAN bus;
each slave plate is used for: managing a plurality of acquisition boards on a daisy chain bus corresponding to the acquisition boards, and acquiring battery parameter data of the acquisition boards through the daisy chain bus;
each collection plate is used for: collecting voltage and temperature parameters of a battery corresponding to the battery module, and transmitting the voltage and temperature parameters to the slave plate through the daisy chain bus;
one slave board corresponds to one daisy chain bus.
2. The high isolation withstand voltage battery management system for rail transit of claim 1, characterized in that:
the main board includes: the system comprises a mainboard MCU module, a mainboard DC/DC power supply module, an input detection module, an output control module, a current acquisition module, a voltage acquisition module and a mainboard CAN interface module;
the mainboard DC/DC power supply module, the input detection module, the current acquisition module, the voltage acquisition module, the output control module and the mainboard CAN interface module are all connected with the mainboard MCU module;
the mainboard DC/DC power supply module is connected with the input detection module, the current acquisition module, the voltage acquisition module, the output control module, the mainboard CAN interface module and the mainboard MCU module;
the mainboard DC/DC power module is used for: the power supply module supplies power to the input detection module, the current acquisition module, the voltage acquisition module, the output control module, the mainboard CAN interface module and the mainboard MCU module;
the input detection module is configured to: the electric isolation and the level detection of the input signal are realized through the optical coupler;
the input signal includes: a digital input signal;
the output control module is used for: the electrical isolation and the on-off control of output signals are realized through the relay;
the output signal includes: a digital output signal;
the current acquisition module is used for: collecting a bus current signal, conditioning the bus current signal, and transmitting the conditioned bus current signal to an AD channel pin arranged on a main board MCU module;
the voltage acquisition module is used for: collecting bus voltage and transmitting a voltage value to a main board MCU module;
the mainboard CAN interface module is used for: realize electrical isolation and CAN bus communication.
3. The high isolation withstand voltage battery management system for rail transit of claim 2, characterized in that: the main board DC/DC power module includes: the isolated DC-DC power supply module is characterized by comprising a 110V-to- +/-15V isolated DC-DC power supply module and a mainboard 110V-to-5V isolated DC-DC power supply module;
the 110V-to- +/-15V isolated DC-DC power supply module is used for: supplying power to the voltage acquisition module and the current acquisition module;
the isolated DC-DC power supply module for converting the main board 110V into the 5V is used for: supplying power to the input detection module, the output control module, the mainboard CAN interface module and the mainboard MCU module;
the mainboard CAN interface module comprises: a motherboard digital isolator and a motherboard CAN transceiver;
the mainboard digital isolator is connected with the mainboard CAN transceiver, the mainboard MCU module and the mainboard DC/DC power module; the mainboard CAN transceiver is in communication connection with the slave boards through a CAN bus;
the motherboard digital isolator is to: and realizing electrical isolation.
4. The high isolation withstand voltage battery management system for rail transit of claim 1, characterized in that: the slave plate includes: the slave board MCU module, the slave board DC/DC power module, the slave board CAN interface module and the daisy chain interface module;
the slave plate DC/DC power supply module, the slave plate CAN interface module and the daisy chain interface module are all connected with the slave plate MCU module;
the slave DC/DC power supply module is connected with the slave CAN interface module, the daisy chain interface module and the slave MCU module;
the slave DC/DC power supply module is used for: power is supplied to the slave plate CAN interface module, the daisy chain interface module and the slave plate MCU module;
the slave CAN interface module is used for: realizing electrical isolation;
the daisy chain interface module is configured to: daisy chain bus communication is achieved.
5. The high isolation withstand voltage battery management system for rail transit of claim 4, wherein:
the slave DC/DC power supply module is as follows: the isolated DC-DC power supply module is used for converting 110V into 5V;
the slave-board CAN interface module comprises: a slave digital isolator I and a slave CAN transceiver;
the first slave digital isolator is connected with the slave CAN transceiver, the slave MCU module and the slave DC/DC power module; the slave board CAN transceiver is in communication connection with the master board through a CAN bus;
the slave digital isolator one is used for: and realizing electrical isolation.
6. The high isolation withstand voltage battery management system for rail transit of claim 4, wherein: the daisy chain interface module includes: a slave plate digital isolator II, a slave plate daisy chain transceiver and a slave plate signal transformer;
the slave plate digital isolator II is connected with the slave plate MCU module and the slave plate daisy chain transceiver; the slave plate daisy chain transceiver is connected with the slave plate signal transformer;
the slave digital isolator two is used for: digitally isolating and transmitting the signal to the daisy chain transceiver;
the slave board daisy chain transceiver is to: converting the signal sent by the slave plate digital isolator II into a differential signal and sending the differential signal to a slave plate signal transformer;
the slave board signal transformer is used for: and the analog isolation is realized, and the analog isolation is connected with a plurality of acquisition boards through a daisy chain bus.
7. The high isolation withstand voltage battery management system for rail transit of claim 6, wherein: a power converter is integrated in the slave digital isolator II;
the power converter is configured to: converting power from the slave DC/DC power supply module to power from the slave daisy-chain transceiver.
8. The high isolation withstand voltage battery management system for rail transit of claim 6, wherein: a parallel matching resistor R2 is arranged in the slave plate daisy chain transceiver.
9. The high isolation withstand voltage battery management system for rail transit of claim 1, characterized in that: the collection plate includes: the device comprises a front-end acquisition chip, an acquisition board DC/DC power module and an acquisition board daisy chain interface module;
the collection board daisy chain interface module includes: a collection board signal transformer;
the front-end acquisition chip is connected with the acquisition board signal transformer, the acquisition board DC/DC power module and the battery module; the acquisition board DC/DC power module is connected with the battery module; the acquisition board signal transformer is connected with the slave board through a daisy chain bus;
the front-end acquisition chip is used for: collecting voltage and temperature parameters of a battery in the battery module;
the acquisition board signal transformer is used for: the electrical isolation is carried out, and the daisy chain bus is connected with the slave plate;
the acquisition board DC/DC power module is used for: and power is taken from the battery module, and after the voltage is converted, the power is supplied to the front-end acquisition chip.
10. The high isolation withstand voltage battery management system for rail transit of claim 9, wherein: when the daisy chain bus has a communication task, the front-end acquisition chip controls an electric enable EN pin arranged on the acquisition board DC/DC power supply module to be in a high level, and the acquisition board DC/DC power supply module normally works to supply power to the acquisition board;
and a parallel matching resistor R1 is arranged on the front-end acquisition chip.
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