CN117523940A - Power battery management system and practical training teaching platform - Google Patents
Power battery management system and practical training teaching platform Download PDFInfo
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- CN117523940A CN117523940A CN202410022081.9A CN202410022081A CN117523940A CN 117523940 A CN117523940 A CN 117523940A CN 202410022081 A CN202410022081 A CN 202410022081A CN 117523940 A CN117523940 A CN 117523940A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
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Abstract
The invention discloses a power battery management system and a practical training teaching platform, wherein the practical training teaching platform comprises an upper computer, the power battery management system comprises a battery module, a communication circuit and a plurality of battery management circuits, the plurality of battery management circuits comprise at least one of a voltage temperature detection circuit, a charge-discharge current monitoring circuit, an equalization control circuit, an alternating current charging control circuit, a high-voltage interlocking detection circuit, a high-voltage relay detection and control circuit and an insulation detection circuit, the battery management circuits are in communication connection with the upper computer through a communication bus, each battery management circuit is independent of each other and can be centralized in connection, and improvement is made in specific battery management circuit design aiming at teaching requirements. Compared with the prior art, the invention realizes teaching of different projects of the battery management system and reduces teaching difficulty.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a power battery management system and a practical training teaching platform.
Background
The battery system is the most important component part of the new energy electric automobile, the endurance mileage, the service life and the safety of the battery are the problems which must be considered in the pure electric automobile, and the battery management system can monitor the voltage, the current, the temperature, the insulativity of the high-voltage system, the faults of high-voltage devices and the like of the battery and continuously perform balanced treatment on the battery, so that the battery is prevented from being invalid or overheated and burnt due to overcharge and overdischarge of the battery, personnel electric shock caused by high-voltage leakage is prevented, and high-voltage electric equipment is prevented from being damaged due to overcurrent and overdischarge.
At present, most of teaching equipment in middle and high school is used for fault diagnosis and detection, practical training equipment for development of a battery management system is few and single in function, and teaching of the development of the battery management system is complex and difficult for students, so that teaching practical training requirements cannot be met.
Disclosure of Invention
The invention mainly aims to provide a power battery management system and a practical training teaching platform, which aim to reduce the teaching difficulty of power battery management system development through split module design and centralized management.
In order to achieve the above purpose, the invention provides a power battery management system applied to a practical training teaching platform, wherein the practical training teaching platform comprises an upper computer, a load and a vehicle-mounted charger, and the power battery management system comprises:
the battery module comprises a plurality of single batteries;
the communication circuit comprises a communication bus and a plurality of communication transceiver circuits electrically connected with the communication bus, and the communication bus is used for accessing the upper computer;
the battery management circuits are electrically connected with the communication transceiver circuits in a one-to-one correspondence manner; the battery management circuit is used for detecting and/or controlling the state of the battery, outputting corresponding state signals and uploading the corresponding state signals to the upper computer for display through the communication transceiver circuit and the communication bus;
wherein the plurality of battery management circuits include:
a voltage temperature detection circuit;
a charge-discharge current monitoring circuit;
an equalization control circuit;
an alternating current charging control circuit;
a high voltage interlock detection circuit;
a high-voltage relay detection and control circuit;
and at least one of an insulation detection circuit.
Optionally, the voltage temperature detection circuit includes:
the system comprises a plurality of voltage acquisition circuits and a plurality of temperature acquisition circuits, wherein the acquisition ends of the voltage acquisition circuits and the acquisition ends of the temperature acquisition circuits are respectively connected with a plurality of single batteries in a one-to-one correspondence manner, the voltage acquisition circuits are used for acquiring output voltage signals between the positive and negative electrodes of the single batteries, and the temperature acquisition circuits are used for acquiring surface temperature signals of the single batteries; the voltage temperature sampling chip is connected with the voltage acquisition circuit and the temperature acquisition circuit and is used for receiving a voltage signal output by the voltage acquisition circuit and a surface temperature signal output by the temperature acquisition circuit;
and the voltage temperature main control chip is connected with the voltage temperature sampling chip and is used for receiving the voltage signals and the surface temperature signals and uploading the signals to the upper computer for display and/or calculation through the communication circuit.
Optionally, the charge-discharge current monitoring circuit includes:
the current sampling chip is used for collecting charge and discharge current signals of the battery;
the current monitoring main control chip is connected with the current sampling chip and is used for receiving the charge and discharge current signals and uploading the charge and discharge current signals to the upper computer for display through the communication circuit;
and the display component is connected with the current main control chip and is used for displaying the charge and discharge current signals.
Optionally, the equalization control circuit includes:
the switching circuits are connected with the single batteries in one-to-one parallel, and each switching circuit comprises at least one resistor and a switching assembly connected with the resistor in series;
the switch assembly driving chip comprises a plurality of driving ports, the driving ports are correspondingly connected with the controlled ends of the switch assemblies one by one, and the switch assembly driving chip is used for driving the switch assemblies to work;
the balancing main control chip comprises a plurality of control ports, the control ports are electrically connected with the control signal input ends of the relay driving chip in a one-to-one correspondence manner, and the balancing main control chip is used for controlling the switch assembly to work;
the light-emitting components are electrically connected with the control ports of the equalization main control chip in a one-to-one correspondence manner, and when the control ports output control signals to control the corresponding switch circuits to be conducted, the light-emitting components correspondingly connected with the control ports are electrified to emit light.
Optionally, the ac charging control circuit includes a CC/CP signal detection circuit.
Optionally, the high voltage interlock detection circuit includes a PWM generator for outputting a pulse square wave signal and withdrawing the pulse square wave signal to form a high voltage interlock loop.
Optionally, the high-voltage relay detection and control circuit includes a low-side control circuit and a high-side control circuit.
Optionally, the insulation detection circuit includes:
the fixed value resistors and the battery module form an insulation detection loop;
and the insulation detection switch assembly is used for switching on or off one or more of the fixed-value resistors.
Optionally, the package of the power battery management system is made of transparent material.
The invention also provides a practical training teaching platform which comprises an upper computer, a load, a vehicle-mounted charger and the power battery management system.
The invention has the beneficial effects that:
the system framework of the power battery management system is formed by modularization, each function of the power battery management system is divided into a plurality of battery management circuits which are independent of each other and can be connected together, the teaching difficulty is reduced, and the teaching of different projects is realized; and the teaching requirement is improved in the specific battery management circuit design, so that the teaching difficulty is further reduced, and the learning and mastering of a learner are facilitated.
Drawings
FIG. 1 is a circuit block diagram of one embodiment of a power battery management system and training teaching platform of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of a voltage temperature detection circuit according to the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of a voltage temperature sampling chip according to the present invention;
FIG. 4 is a schematic circuit diagram of an embodiment of a voltage temperature control chip according to the present invention;
FIG. 5 is a schematic circuit diagram of a charge/discharge current detection circuit according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of an equalization control circuit according to an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of a CC/CP signal detection circuit according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of an insulation detection circuit according to an embodiment of the present invention;
FIG. 9 is a schematic perspective view of an embodiment of the training platform according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a power battery management system which is applied to a practical training teaching platform and aims to reduce the teaching difficulty of development of the power battery management system.
In one embodiment, as shown in fig. 1, the training teaching platform includes an upper computer 11, a load 15 and a vehicle-mounted charger 13, and the power battery management system includes:
a battery module 14 including a plurality of unit cells;
the communication circuit 12 comprises a communication bus and a plurality of communication transceiver circuits electrically connected with the communication bus, wherein the communication bus is used for accessing the upper computer;
the battery management circuits are electrically connected with the communication transceiver circuits in a one-to-one correspondence manner; the battery management circuit is used for detecting and/or controlling the state of the battery, outputting corresponding state signals and uploading the corresponding state signals to the upper computer for display through the communication transceiver circuit and the communication bus;
wherein the plurality of battery management circuits include:
a voltage temperature detection circuit 16;
a charge-discharge current monitoring circuit 17;
an equalization control circuit 18;
an ac charge control circuit 19;
a high voltage interlock detection circuit 20;
a high-voltage relay detection and control circuit 21;
and at least one of insulation detection circuits 22.
Specifically, in order to reduce the teaching degree of difficulty of power battery management system development, the power battery management system that this application provided adopts the sub-module teaching, and the sub-module indicates a plurality of independent battery management circuits, and a plurality of battery management circuits can be used for the teaching alone to different teaching projects, also accessible communication bus interconnect concentrates on teaching.
In one embodiment, the single battery can be a blade battery; the blade battery has good thermal stability, and a plurality of blade batteries can form a module through spot welding.
In one embodiment, the control program for all battery management circuits may be written in the C language.
It can be understood that the control program code of the existing battery management system is basically generated by an automatic code generating tool such as Matlab, simulink, ECUCoder, and it is difficult for a learner to learn the programming skill of the battery management system, so that in this embodiment, the control program of all the battery management circuits is written in the most basic C language, so that the learner can learn the basic C language development conveniently.
In an embodiment, the communication circuit CAN be a CAN bus communication circuit, the CAN bus is a communication mode which is used in the field of vehicle control, the CAN bus is used for centralizing all data of the power battery management system through the CAN transceiver circuit to realize driving load and integral fault alarm, and meanwhile, the communication circuit is communicated with an upper computer to display voltage, temperature, battery capacity, current, insulation resistance, state of each relay, interlocking state, fault information and the like; meanwhile, the CAN bus is also used for communication between each module of the power battery management system and the vehicle-mounted charger and is used for determining alternating-current charging data.
According to the embodiment, all the sub-modules of the power battery management system provided by the application are independent and can be connected together, and the teaching difficulty is reduced according to the teaching requirement and being applicable to different teaching projects; meanwhile, all modules are developed by adopting a basic C language, so that students can learn programming skills of a battery management system conveniently.
Based on the above embodiments, in a further embodiment, the voltage temperature detection circuit includes:
the system comprises a plurality of voltage acquisition circuits and a plurality of temperature acquisition circuits, wherein the acquisition ends of the voltage acquisition circuits and the acquisition ends of the temperature acquisition circuits are respectively connected with a plurality of single batteries in a one-to-one correspondence manner, the voltage acquisition circuits are used for acquiring output voltage signals between the positive and negative electrodes of the single batteries, and the temperature acquisition circuits are used for acquiring surface temperature signals of the single batteries; the voltage temperature sampling chip is used for receiving the voltage signal output by the voltage acquisition circuit and the surface temperature signal output by the temperature acquisition circuit;
and the voltage temperature main control chip is connected with the voltage temperature sampling chip, receives the voltage signals and the surface temperature signals, and uploads the signals to the upper computer for display and/or calculation through the communication circuit.
Specifically, as shown in fig. 2, fig. 2 is a circuit block diagram of an embodiment of a voltage temperature detection circuit: the sampling chip collects voltage signals and temperature signals of each single battery through the voltage collecting circuit; the battery cells are sequentially overlapped in a serial connection mode, and the voltage acquisition circuit can select a classical RC filter circuit to realize voltage sampling of the single battery; the temperature acquisition circuit can realize surface temperature sampling of the single battery by using a thermistor (NTC).
In an embodiment, as shown in fig. 3, the voltage temperature sampling chip may be a sampling chip with a model of BQ76940, where the BQ76940 chip includes sampling ports (VC 0 to VC 15) connected to the voltage acquisition circuit in a one-to-one correspondence manner, and further includes a CHG and DSG module for controlling charging and discharging according to the received voltage information and temperature information so as to prevent overcharging or undervoltage of the battery.
In an embodiment, as shown in fig. 4, the voltage temperature main control chip may be a control chip with a model number of STM32F103C8T6, and the STM32F103C8T6 control chip and the voltage temperature sampling chip may be connected in an I2C communication manner, so as to receive the voltage information and the temperature information of the single battery acquired by the voltage temperature acquisition chip, and be connected with the upper computer in a communication manner through the CAN transceiver circuit and the CAN bus.
And after receiving the information transmitted by the voltage temperature main control chip, the upper computer displays the data such as the voltage, the temperature, the highest voltage, the lowest voltage, the single battery differential pressure, the SOC, the SOH, the charging and discharging states and the like of each single battery in real time.
Further, the charge-discharge current monitoring circuit includes:
the current sampling chip is used for collecting charge and discharge current signals of the battery through a Hall current sensor;
the current monitoring main control chip is connected with the current sampling chip and is used for receiving the charge and discharge current signals and uploading the charge and discharge current signals to the upper computer for display through the communication circuit;
and the display component is connected with the current main control chip and is used for displaying the charge and discharge current signals.
Specifically, as shown in fig. 5, fig. 5 is a circuit configuration diagram of an embodiment of a charge-discharge current detection circuit.
The current sampling chip collects current signals of charging or discharging of the battery module through the Hall current sensor, and transmits the current signals to the current monitoring main control chip through an OUT port of the chip.
In this embodiment, the current monitoring main control chip may be a control chip with a model STC12C5204AD28, and the current monitoring main control chip includes a signal receiving port connected to the current sampling chip, a communication transceiving port connected to the communication circuit, and a plurality of control ports for controlling the display assembly.
In this embodiment, the display component may select an LED nixie tube to display a current signal, fig. 5 shows a 4-bit 8-segment LED nixie tube, and the corresponding current monitoring main control chip has 8 LED control signal output ends and 4 bit selection signal output ends; the LED nixie tube intuitively displays and monitors the charge and discharge real-time current.
Further, the equalization control circuit includes:
the switching circuits are connected with the single batteries in one-to-one parallel, and each switching circuit comprises at least one resistor and a switching assembly connected with the resistor in series;
the switch assembly driving chip comprises a plurality of driving ports, the driving ports are correspondingly connected with the controlled ends of the relay switches one by one, and the switch assembly driving chip is used for driving the switch assemblies to work;
the balanced main control chip comprises a plurality of control ports, the control ports are electrically connected with the control signal input ends of the switch assembly driving chip in a one-to-one correspondence manner, and the balanced main control chip is used for controlling the switch assembly to work;
the light-emitting components are electrically connected with the control ports of the equalization main control chip in a one-to-one correspondence manner, and when the control ports output control signals to control the corresponding switch circuits to be conducted, the light-emitting components correspondingly connected with the control ports are electrified to emit light.
Specifically, as shown in fig. 6, fig. 6 is a circuit configuration diagram of an embodiment of the equalization control circuit:
the balancing control method adopted by the embodiment is load consumption type balancing, the single batteries (B1 to B15) are connected in series, and the single batteries and the current-limiting protection resistors (R1 to R16) are connected in series in a staggered manner; each current limiting protection resistor is connected with one switching circuit in parallel; the switch components of the switch circuits can be relay switches (JK 1 to JK 16), and the switch components of any switch circuit are connected with a resistor (R17 to R32) in series; the driving chip of the switch assembly can be a driving chip with the model of ULN2003A and is used for driving the relay switch to work; the equalization main control chip can be selected from main control chips with the model number of STC89C52 RC.
Specifically, when the voltage of a certain single battery is too high, the relay switch is controlled to be turned on, and the charging current is shunted through the resistor of the switch circuit, so that the battery charging current with high voltage is small, the battery charging current with low voltage is large, and the balance of the battery voltage is realized.
The embodiment further comprises a light-emitting component, the light-emitting component can be an LED lamp, the control port of the balancing main control chip is connected with the LED lamps in one-to-one correspondence, when the balancing main control chip balances a certain single battery (namely, the corresponding switch circuit is conducted), the corresponding LED lamp is lighted, and students can conveniently know the balancing principle and the control mode.
Further, the alternating current charging control circuit includes a CC/CP signal detection circuit.
It can be understood that the "handshake" is realized between the ac charging system and the vehicle through the analog level, and the CC/CP signal detection circuit is used for physical connection confirmation of the ac charging interface and guidance of the charging process; the alternating current charging control circuit also comprises a main control circuit (a singlechip).
Specifically, as shown in fig. 7, fig. 7 is a circuit configuration diagram of an embodiment of a CC/CP signal detection circuit, including a CP wake-up circuit and a charge guidance control circuit, where the circuit configuration is specifically as follows:
a charge guidance control circuit: the anode of the diode D2 is connected with a CP signal input end, a branch circuit where the resistor R33, the resistor R34, the resistor R35 and the resistor R36 are positioned forms a parallel circuit, the cathode of the diode D2 is connected with a first end of the parallel circuit, a second end of the parallel circuit is grounded, the branch circuit where the resistor R33 is positioned is also connected with the switch tube Q1 in series, the first end of the switch tube Q1 is connected with the resistor R33, the second end of the switch tube Q1 is grounded, the branch circuit where the resistor R36 is positioned is also connected with the resistor R37 in series, the first end of the resistor R37 is connected with the resistor R36, the second end of the resistor R37 is grounded, and the first end of the resistor R37 is a CP detection signal output port OUT1; the first end of the resistor R37 is also connected with the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is grounded; the anode of the diode D2 is further connected to the first end of the zener diode D3, and the second end of the zener diode D3 is grounded.
Specifically, before the charging gun is inserted into the charging interface of the battery module, the CP signal received by the main control circuit is 12V high level; after the charging gun is connected with the charging interface, the CP output signal of the charging gun is changed into a 9V PWM signal; after receiving the 9V PWM signal, the alternating current charging main control circuit confirms that the battery high-voltage system and the communication system have no faults through the CAN communication circuit, and then outputs a signal to control the triode Q1 to be conducted so that the CP signal jumps to be a 6V PWM signal, and the power supply equipment (such as a vehicle-mounted charger) starts to charge the automobile through a charging gun after detecting the 6V PWM signal.
CP wake-up circuit: the anode of the diode D1 is connected with the CP signal input end, the cathode of the diode D1 is connected with the first end of the resistor R38, the second end of the resistor R38 is connected with the first end of the resistor R39, the second end of the resistor R39 is grounded, and the first end of the resistor R39 is a wake-up detection port OUT2; the second end of the diode D1 is also connected with the first ends of the first capacitor C1 and the second capacitor C2, and the second ends of the first capacitor C1 and the second capacitor C2 are grounded; the cathode of the diode D1 is further connected with a first end of a resistor R40, a second end of the resistor R40 is a wake-up output port OUT3, the second end of the resistor R40 is further connected with a first end of a third switching tube Q3, a second end of the third switching tube Q3 is connected with a first end of a fourth capacitor, the second end of the third switching tube Q3 is led OUT of a Q3 conduction detection port OUT4, the second end of the fourth capacitor is grounded, a controlled end of the third switching tube Q3 is connected with a first end of a second switching tube Q2, the second end of the second switching tube Q2 is grounded, and a controlled end of the second switching tube Q2 is connected with an alternating-current charging main control circuit through a resistor R41.
Specifically, after the charging gun is connected to the charging interface, after the wake-up detection port OUT2 detects the CP signal, the output control signal controls the second switching tube Q2 to be conducted, so that the third switching tube Q3 is conducted to be grounded, the wake-up output port outputs a wake-up signal to the power battery management system, and the power battery management system enters a charging process.
Further, the high-voltage interlock detection circuit comprises a PWM generator for outputting a pulse square wave signal and withdrawing the pulse square wave signal to form a high-voltage interlock loop.
Specifically, the integrity of a circuit needs to be detected before the vehicle is electrified, so that high-voltage safety is ensured, and accidents caused by virtual connection and other problems are avoided; the high-voltage interlocking detection circuit judges whether each high-voltage connector of the high-voltage circuit is connected completely and tightly by using the detection signal of the low-voltage circuit, and ensures the electrical connectivity and integrity of the high-voltage circuit.
The embodiment adopts a PWM high-voltage interlocking detection scheme, wherein the high-voltage interlocking detection circuit comprises a PWM generator, the PWM generator sends out square wave signals with a certain duty ratio, the square wave signals are retracted by the PWM signal generator after passing through each high-voltage connector, and the integrity of the high-voltage interlocking loop is judged according to the duty ratio change of the square wave signals; the high-voltage connector can comprise a high-voltage connector on high-voltage devices such as a battery module, a load, a vehicle-mounted charger, a high-voltage junction box and the like, and also can comprise high-voltage connectors on high-voltage devices such as external motors, motor controllers, air conditioner compressors, electric heaters and the like.
Further, the high-voltage relay detection and control circuit comprises a low-side control circuit and a high-side control circuit.
Specifically, the control of the relay is divided into a low-side control mode and a high-side control mode, and the low-side control circuit and the high-side control circuit are both arranged in the high-voltage relay detection and control circuit, so that a learner can learn two control modes and principles conveniently; optionally, the low-side control circuit and the high-side control circuit both use PWM pulse signals to control the on-off of the MOS tube, so as to control the on-off of the relay.
In one embodiment, the high voltage relay includes a total positive relay, a total negative relay, a pre-charge relay, a DC-DC relay, and an ac slow charge relay.
Further, the insulation detection circuit includes: the fixed value resistors and the battery module form an insulation detection loop; and the insulation detection switch assembly is used for switching on or off one or more of the fixed-value resistors.
Specifically, as shown in fig. 8, fig. 8 is a circuit configuration diagram of an embodiment of the insulation detection circuit:
the insulation detection switch assembly can select an optical coupling isolator to avoid electric connection interference; the model of the optical coupler isolator can be AQV258HAX; the first end of the resistor R42 is connected with the control circuit power supply VCC, the second end of the resistor R42 is connected with the anode of the light emitting diode in the opto-coupler isolator, the first end of the switch tube Q4 is connected with the cathode of the light emitting diode, the second end of the switch tube Q4 is grounded, and the on-off of the opto-coupler isolator is controlled by controlling the controlled end of the switch tube Q4; the resistors R43, R44, R45 and R46 are connected in series between the output anode of the battery module and the public ground to form a first branch; the resistors R47, R48, R49, R50 and R51 and the optocoupler isolator are connected in series between the output anode of the battery module and the public ground to form a second branch; the first branch is connected in parallel with the second branch, and the on-off of the second branch is controlled through an optical coupler isolator.
The embodiment adopts a ground insulation detection method, and is suitable for basic teaching; and controlling the connection and disconnection of the second branch resistor through the switch assembly, measuring the voltage value of the anode and the cathode of the battery module to the ground twice, and calculating the resistance of the anode and the cathode of the battery module to the ground through kirchhoff's law.
Further, the package body of the battery management circuit is made of transparent materials.
Specifically, the battery management circuit can be packaged by an acrylic glass plate, so that a learner can conveniently check and monitor the operation process of any battery management circuit.
In summary, the power battery management system provided by the invention adopts a system frame of the power battery management system formed by modularization, each function of the power battery management system is divided into a plurality of independent battery management circuits which can be connected together, the teaching difficulty is reduced, and the teaching of different projects is realized; and the teaching requirement is improved in the specific battery management circuit design, so that the teaching difficulty is further reduced, and the learning and mastering of a learner are facilitated.
The invention also provides a practical training teaching platform, as shown in fig. 9, in an embodiment, the practical training teaching platform comprises an upper computer 11, a load 15, a vehicle-mounted charger 13 and the power battery management system.
In the present embodiment, the power battery management system includes a battery module 14 and at least one of a voltage temperature detection circuit 16, a charge-discharge current monitoring circuit 17, an equalization control circuit 18, an ac charge control circuit 19, a high-voltage relay detection and control circuit 21, and an insulation detection circuit 22.
Specifically, the vehicle-mounted charger 13 is used for charging the battery module, the vehicle-mounted charger 13 comprises an alternating current charging system, and the training teaching platform further comprises an alternating current charging interface and an alternating current charging gun matched with the vehicle-mounted charger 13; the load 15 is used for discharging the battery module 14, and the load 15 can be a 500W permanent magnet rotor motor; the power battery management system operates with the battery module 14 and the load 15.
In one embodiment, the training platform further includes a distribution box 24 for managing high-voltage distribution lines, and the high-voltage interlock detection circuit is located in the distribution box 24; and a DC-DC converter 23 for regulating the output of the battery module 14.
The upper computer 11 comprises upper computer software, the upper computer software is used for displaying, setting, programming and debugging parameters of the power battery management system, and the upper computer software is developed by using a Visual Studio (win form) system and has the characteristics of simple codes, freely designed interfaces, interactive teaching and the like.
The upper computer 11 further comprises an SOC calculation module for calculating the residual capacity of the battery; the SOC calculation method can be selected from an ampere-hour integration method and an open circuit voltage method.
The upper computer 11 also comprises teaching resource packages for teaching the PCB principle, C language programming teaching and the like.
The practical training teaching platform provided by the application has all the characteristics and beneficial effects of the power battery management system, and is not described in detail herein; meanwhile, the practical training teaching platform integrates parameter display, setting, programming and debugging and related teaching resources through an upper computer, so that the integrated design of power battery management system teaching is realized; the practical training teaching platform can be used for development, study and practical training of a power battery management system of a middle and high school.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather, the equivalent structures or equivalent flow modifications made by the present invention and the contents of the drawings, or the direct or indirect application to other related technical fields are included in the scope of the invention.
Claims (10)
1. The utility model provides a power battery management system, is applied to real standard teaching platform, its characterized in that, real standard teaching platform includes host computer, load and on-vehicle machine that charges, power battery management system includes:
the battery module comprises a plurality of single batteries;
the communication circuit comprises a communication bus and a plurality of communication transceiver circuits electrically connected with the communication bus, and the communication bus is used for accessing the upper computer;
the battery management circuits are electrically connected with the communication transceiver circuits in a one-to-one correspondence manner; the battery management circuit is used for detecting and/or controlling the state of the battery, outputting corresponding state signals and uploading the corresponding state signals to the upper computer for display through the communication transceiver circuit and the communication bus;
wherein the plurality of battery management circuits include:
a voltage temperature detection circuit;
a charge-discharge current monitoring circuit;
an equalization control circuit;
an alternating current charging control circuit;
a high voltage interlock detection circuit;
a high-voltage relay detection and control circuit;
and at least one of an insulation detection circuit.
2. The power battery management system of claim 1, wherein the voltage temperature detection circuit comprises:
the system comprises a plurality of voltage acquisition circuits and a plurality of temperature acquisition circuits, wherein the acquisition ends of the voltage acquisition circuits and the acquisition ends of the temperature acquisition circuits are respectively connected with a plurality of single batteries in a one-to-one correspondence manner, the voltage acquisition circuits are used for acquiring output voltage signals between the positive and negative electrodes of the single batteries, and the temperature acquisition circuits are used for acquiring surface temperature signals of the single batteries; the voltage temperature sampling chip is connected with the voltage acquisition circuit and the temperature acquisition circuit and is used for receiving a voltage signal output by the voltage acquisition circuit and a surface temperature signal output by the temperature acquisition circuit;
and the voltage temperature main control chip is connected with the voltage temperature sampling chip and is used for receiving the voltage signals and the surface temperature signals and uploading the signals to the upper computer for display and/or calculation through the communication circuit.
3. The power battery management system of claim 1, wherein the charge-discharge current monitoring circuit comprises:
the current sampling chip is used for collecting charge and discharge current signals of the battery;
the current monitoring main control chip is connected with the current sampling chip and is used for receiving the charge and discharge current signals and uploading the charge and discharge current signals to the upper computer for display through the communication circuit;
and the display component is connected with the current main control chip and is used for displaying the charge and discharge current signals.
4. The power battery management system of claim 1, wherein the equalization control circuit comprises:
the switching circuits are connected with the single batteries in parallel in a one-to-one correspondence manner, and each switching circuit comprises at least one resistor and a switching assembly connected with the resistor in series;
the switch assembly driving chip comprises a plurality of driving ports, the driving ports are correspondingly connected with the controlled ends of the switch assemblies one by one, and the switch assembly driving chip is used for driving the switch assemblies to work;
the balancing main control chip comprises a plurality of control ports, the control ports are electrically connected with the control signal input ends of the relay driving chip in a one-to-one correspondence manner, and the balancing main control chip is used for controlling the switch assembly to work;
the light-emitting components are electrically connected with the control ports of the equalization main control chip in a one-to-one correspondence manner, and when the control ports output control signals to control the corresponding switch circuits to be conducted, the light-emitting components correspondingly connected with the control ports are electrified to emit light.
5. The power battery management system of claim 1 wherein the ac charge control circuit comprises a CC/CP signal detection circuit.
6. The power battery management system of claim 1 wherein the high voltage interlock detection circuit comprises a PWM generator for outputting a pulse square wave signal and retracting the pulse square wave signal to form a high voltage interlock loop.
7. The power battery management system of claim 1 wherein the high voltage relay detection and control circuit comprises a low side control circuit and a high side control circuit.
8. The power battery management system of claim 1, wherein the insulation detection circuit comprises:
the fixed value resistors and the battery module form an insulation detection loop;
and the insulation detection switch assembly is used for switching on or off one or more of the fixed-value resistors.
9. The power cell management system of claim 1, wherein the package of the power cell management system is transparent.
10. A practical training teaching platform, comprising an upper computer, a load, a vehicle-mounted charger, and the power battery management system of any one of claims 1 to 9.
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