CN113093023A - Storage battery monomer on-line monitoring system - Google Patents
Storage battery monomer on-line monitoring system Download PDFInfo
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- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
- G01R31/379—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator for lead-acid batteries
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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Abstract
The application discloses battery monomer on-line monitoring system includes: the storage battery management system comprises a storage battery information display module, a plurality of single storage battery acquisition modules and a plurality of storage battery management modules, wherein the plurality of single storage battery acquisition modules are sequentially in communication connection, the head and tail two single storage battery acquisition modules of the plurality of single storage battery acquisition modules which are sequentially in communication connection are in communication access to the storage battery management module, and the plurality of storage battery management modules are in communication connection with the storage battery information display module. The communication between the single storage battery acquisition module and the single storage battery acquisition module of this application is connected, data transfer is with hand-in-hand's mode, establishes ties all single modules of whole group, and two single module communications access group battery management module of whole group head and the tail form the loop communication mode, can effectively avoid certain module trouble or communication line disconnection like this, do not influence whole group data transmission and show for the on-line monitoring to the battery is reliable, stable.
Description
Technical Field
The application relates to the technical field of battery monitoring, in particular to a storage battery monomer on-line monitoring system.
Background
With the wide application of the storage battery, especially the application in the standby power supply, the lead-acid storage battery is generally used as a very important part of the standby power supply. The storage battery pack is in a charging state as a backup power supply at ordinary times and is connected with the output of the charging device in parallel, once the commercial power is interrupted, the storage battery immediately starts to discharge to replace the commercial power to supply power for the equipment, and therefore the operation duration of the equipment is achieved. If the capacity of a single storage battery is reduced to a certain degree, the storage battery pack cannot play a role of a standby power supply, and once a main power supply fails, system shutdown can be caused, so that huge loss is caused. The detection of the state of the storage battery in the operation process of the storage battery is the most concerned problem of users and is one of the biggest problems of using the storage battery by a backup power supply, the operation requirement of the storage battery is strict, and the service life of the storage battery is influenced and even serious consequences are caused when the storage battery operates under the condition deviating from the correct use condition, so that the operation parameter monitoring of the lead-acid storage battery is very important. Traditional battery on-line monitoring uses group battery centralized management's mode, and equipment has improved data acquisition's speed and precision, has reduced work load, but the line is more, and the operation is complicated, has certain potential safety hazard, and can't get rid of the influence of "passing a bridge voltage" that connecting wire produced between the battery when a line system was gathered to measured data.
Disclosure of Invention
The main aim at of this application provides a battery monomer on-line monitoring system to it is more to solve prior art's battery monitoring circuit line, and the operation is complicated, has certain potential safety hazard, and can't get rid of the problem of the influence of "passing a bridge voltage" that a line system connecting wire produced to measured data when gathering.
In order to achieve the above object, the present application provides an online monitoring system for battery cells, comprising:
storage battery information display module, a plurality of monomer battery collection module and a plurality of storage battery management module, the communication connection in proper order between a plurality of monomer battery collection module, just two monomer battery collection module communications access storage battery management module of head and the tail of a plurality of monomer battery collection module, a plurality of storage battery management module and storage battery information display module communication connection, wherein:
the single storage battery acquisition module is used for acquiring single battery monitoring data of at least voltage, internal resistance and temperature of a single storage battery and sending the single battery monitoring data to the storage battery management module;
the storage battery management module is used for collecting at least battery pack charging and discharging current, battery pack terminal voltage, battery pack bus voltage, battery pack environmental temperature battery pack monitoring data and monocell monitoring data, and sending the battery pack monitoring data and the monocell monitoring data to the storage battery information display module;
and the storage battery pack information display module is used for displaying the battery pack monitoring data and the single battery monitoring data.
Preferably, the plurality of single storage battery acquisition modules, the single storage battery acquisition modules and the storage battery management module, and the storage battery management module and the storage battery information display module are all connected through RS485 communication.
Preferably, the single storage battery acquisition module comprises a voltage acquisition unit, a temperature acquisition unit, an internal resistance acquisition unit, a module address setting unit, a module communication unit and a first microcontroller unit, wherein the voltage acquisition unit, the temperature acquisition unit, the internal resistance acquisition unit, the module address setting unit and the module communication unit are all connected with the first microcontroller unit, and the single storage battery acquisition module comprises:
the voltage acquisition unit acquires the voltage of the battery by adopting a voltage amplification circuit based on an operational amplifier, and the voltage amplification circuit is connected with the first microcontroller unit through an ADC (analog to digital converter) chip;
the temperature acquisition unit adopts an NTC temperature sensor;
the internal resistance acquisition unit is a constant current circuit;
the module address setting unit is a dial switch;
the module communication unit comprises two parallel outlets of one RS485 communication chip;
the first microcontroller unit is a single chip processor.
Preferably, the voltage acquisition unit and the internal resistance acquisition unit adopt a four-wire system mode.
Preferably, the storage battery management module comprises a second microcontroller unit, a passive dry contact unit electrically connected with the second microcontroller unit, an address setting unit, an RS485 communication unit, an ambient temperature acquisition unit, a battery pack charging and discharging current acquisition unit, a battery pack terminal voltage acquisition unit, and a battery pack separation bus detection unit, wherein:
the second microcontroller unit is a singlechip processor;
the address setting unit is a four-bit dial switch;
the passive dry contact unit comprises a plurality of groups of relay control circuits, and each relay control circuit comprises a photoelectric coupler, a driving triode and a relay which are connected in sequence;
the RS485 communication units are divided into two single acquisition module communication units and a display screen host communication unit;
the environment temperature acquisition unit is an NTC temperature sensor;
the battery pack charging and discharging current acquisition unit comprises a Hall current sensor, an inductor filter circuit, a differential amplification circuit and a voltage follower circuit which are connected in sequence;
the group end voltage acquisition unit and the battery pack separation bus detection unit adopt a high voltage-resistant optical coupling isolation circuit to acquire the battery pack end voltage and the battery pack bus voltage in real time.
Preferably, the passive dry contact unit includes four passive dry contact circuits, which are respectively a voltage, a temperature, an internal resistance, and other alarm passive dry contact circuits.
Preferably, filter circuit, difference amplifier circuit, following circuit, ADC circuit, digital isolation chip have connected gradually behind the high withstand voltage opto-coupler isolation circuit output, bus voltage and group battery voltage are gathered at second microcontroller unit gating high withstand voltage opto-coupler isolation circuit's isolation opto-coupler interval, and after filter circuit, difference amplifier circuit, following circuit, ADC circuit, digital isolation chip signal processing, second microcontroller unit judges whether the group battery bus breaks away from through comparison bus voltage and group battery voltage.
Preferably, the internal resistance acquisition unit is a closed-loop feedback type constant current circuit, acquires a voltage Vmin at which the battery voltage drops to a lowest point when the battery is discharged, and a knee point voltage V at which the battery voltage recovers after the discharge is completed, obtains a battery voltage variation value Δ U-V-Vmin, and then calculates an internal resistance value R- Δ U/I.
Preferably, the single storage battery acquisition module is connected with the battery in parallel by an acquisition line.
Preferably, the battery pack information display module is internally provided with an overrun threshold of the battery pack monitoring data and the single cell monitoring data, when the battery pack monitoring data and the single cell monitoring data exceed the threshold, the battery pack information display module gives an alarm, and meanwhile, the battery pack information display module stores alarm information.
The beneficial effect of this application:
1. the communication between the single storage battery acquisition module and the single storage battery acquisition module is connected, data transmission is in a hand-pulling mode, all single modules of the whole group are connected in series, the head and the tail of the whole group are communicated with the battery pack management module to form a loop communication mode, so that the faults or communication lines of certain modules can be effectively avoided from being disconnected, the data transmission and display of the whole group are not influenced, and the storage battery is reliably and stably monitored on line.
2. The utility model provides a battery monomer collection module adopts four-wire system internal resistance test mode, has got rid of the influence to measured data of "gap bridge voltage" that a line system connecting wire produced when gathering, has simple to operate, and the wiring is simple, and the data acquisition precision is high, and it is fast to gather data, stable performance's advantage.
3. The storage battery monomer acquisition module is connected with the battery in parallel by using the acquisition line, so that the measurement error caused by the length of the line is avoided; meanwhile, the acquisition module and the storage battery are installed in parallel through a lead, the main loop is not influenced, the interface has protection, and the equipment is ensured not to influence the battery, so that the battery is simple to install and convenient to maintain; damage or replacement of individual modules does not affect the use of the entire group.
4. This application has monomer battery voltage, temperature, internal resistance, storage battery terminal voltage, charge-discharge current, ambient temperature, monitoring function such as group battery generating line breaks away from, reports an emergency and asks for help or increased vigilance when the parameter is unusual, and data acquisition is quick accurate, and the function is various, has ensured the reliable steady operation of battery.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is a schematic block diagram of an online monitoring system for battery cells provided according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a first microcontroller unit circuit provided according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of an internal resistance acquisition unit provided according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a voltage acquisition unit circuit provided according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a module address setting unit circuit provided according to an embodiment of the present application;
FIG. 6 is a schematic circuit diagram of a modular communication unit according to an embodiment of the present application;
FIG. 7 is a functional block diagram of a battery management module provided in accordance with an embodiment of the present application;
fig. 8 is a schematic circuit diagram of a battery pack charging and discharging current collecting unit provided according to an embodiment of the present application;
fig. 9 is a schematic circuit diagram of a passive dry contact cell provided in accordance with an embodiment of the present application;
FIG. 10 is a schematic diagram of a second microcontroller unit circuit provided according to an embodiment of the present application;
fig. 11 is a schematic circuit diagram of a high voltage resistant optical coupler isolation circuit for providing a group terminal voltage acquisition unit and a group disconnection bus detection unit according to an embodiment of the present application;
fig. 12 is a schematic diagram of a filter circuit, a differential amplifier circuit and a follower circuit of a battery pack terminal voltage acquisition unit and a battery pack disconnection bus detection unit provided according to an embodiment of the present application;
fig. 13 is a schematic circuit diagram of an ADC circuit of a group terminal voltage acquisition unit and a group off-bus detection unit provided in an embodiment of the present application;
fig. 14 is a schematic circuit diagram of a digital isolation chip of a battery pack terminal voltage acquisition unit and a battery pack disconnection bus detection unit provided according to an embodiment of the present application;
fig. 15 is a schematic structural diagram of a cell monitoring system provided according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the present application provides an on-line monitoring system for battery cells, comprising:
storage battery information display module, a plurality of monomer battery collection module and a plurality of storage battery management module, the communication connection in proper order between a plurality of monomer battery collection module, and two monomer battery collection module communications access storage battery management module of head and the tail of a plurality of monomer battery collection module, a plurality of storage battery management module and storage battery information display module communication connection, wherein:
the single storage battery acquisition module is used for acquiring single battery monitoring data of at least voltage, internal resistance and temperature of a single storage battery and sending the single battery monitoring data to the storage battery management module;
the storage battery management module is used for collecting battery monitoring data and monocell monitoring data of at least battery charging and discharging current, battery group terminal voltage, battery bus voltage and battery environment temperature, and sending the battery monitoring data and the monocell monitoring data to the storage battery information display module;
and the storage battery pack information display module is used for displaying monitoring data information of all the battery packs.
In this embodiment, each storage battery pack information display module can display 4 groups of battery pack data, each group of battery pack corresponds to one storage battery pack management module, and one storage battery pack management module can monitor 256 battery data at most, that is, can access 256 single storage battery acquisition modules. As shown in fig. 15, it is a schematic structural diagram of the single battery monitoring system of the present application, wherein: 1. a storage battery pack information display module; 2. the battery pack management module 3 is a single battery acquisition module; 4 hall current sensors; 5, a storage battery; 6 computer or background software.
In this embodiment, the plurality of single storage battery acquisition modules, the single storage battery acquisition modules and the storage battery management module, and the storage battery management module and the storage battery information display module are all connected through RS485 communication.
In this embodiment, the single storage battery collection module includes a voltage collection unit, a temperature collection unit, an internal resistance collection unit, a module address setting unit, a module communication unit and a first microcontroller unit, and the voltage collection unit, the temperature collection unit, the internal resistance collection unit, the module address setting unit and the module communication unit are all connected with the first microcontroller unit, wherein:
the voltage acquisition unit acquires the voltage of the battery by adopting a voltage amplification circuit based on an operational amplifier, and the voltage amplification circuit is connected with the first microcontroller unit through an ADC (analog-to-digital converter) chip; as shown in fig. 2, in this embodiment, the voltage acquisition unit selects an 18-bit ADC chip ADS1110, and communicates with the main chip MCU through IIC to process and transmit the acquired voltage value by the main chip MCU; the voltage acquisition adopts a four-wire system mode, the voltage acquisition wire basically has no current flowing, so that the acquired voltage value is more accurate, and a voltage acquisition circuit is shown in figure 4;
the temperature acquisition unit adopts an NTC temperature sensor, high-precision reference voltage is designed in the temperature acquisition unit, the voltage value of the NTC sensor is acquired in real time in a voltage division mode, an NTC resistance value is calculated according to a program algorithm, and an accurate temperature value is calculated by using a table look-up method according to an NTC R-T table; the NTC sensor is tightly attached to an OT terminal of a negative electrode of the acquisition line, and because the OT terminal is connected to the negative electrode of the battery, the internal temperature of the battery is very close to the main temperature of the battery, and the acquired temperature value truly reflects the internal temperature change of the battery.
The internal resistance acquisition unit is a closed loop feedback type constant current circuit, acquires the voltage Vmin of the battery which is dropped to the lowest point when the storage battery is discharged, acquires the inflection point voltage V of the voltage recovery of the storage battery after the discharge is finished, obtains the voltage change value delta U of the storage battery as V-Vmin, and then calculates the internal resistance value R as delta U/I. The constant current circuit of the internal resistance acquisition unit in this embodiment is as shown in fig. 3, and Q3 is an anti-reverse connection device to prevent the damage of the module due to the reverse connection of the positive and negative electrodes of the power supply voltage line. The internal resistance is tested in a constant current source circuit of the field effect tube, and the current is converted into sampling voltage through a sampling resistor R14. The sampling voltage is reversely amplified by the operational amplifier U5B and then is sent to the inverting terminal of the operational amplifier U5A as a feedback voltage VF, and is compared with a reference voltage Vref to adjust the grid voltage, so that the output current is adjusted, the whole closed-loop feedback system is in dynamic balance, and the purpose of stabilizing the output current is achieved. If the output current is increased, the sampling voltage on the sampling resistor is increased, the feedback voltage VF is also increased, the voltage of the inverting end of the operational amplifier U5A is increased, and the reference voltage Vref of the non-inverting end of the operational amplifier U5A is not changed, so that the output voltage of the operational amplifier U5A is reduced, the voltage of the grid electrode of the field effect transistor Q1 is reduced, the output current is reduced, and therefore negative feedback is formed in the front and the back of the constant current circuit, and the output current is kept stable. In this embodiment, the designed constant current is about 4A, the battery voltage is collected when the battery is discharged, the battery voltage drops to the lowest point voltage Vmin, and the inflection point voltage V of the battery voltage recovery after the discharge is completed, so as to obtain the battery voltage variation value Δ U-V-Vmin, and then the internal resistance value R- Δ U/I is calculated. And the internal resistance test adopts a four-wire system method, and the design scheme adopts soft and hard filtering measures, so that the influence of a charger on the internal resistance test can be effectively filtered, and the accuracy, consistency and repeatability of the internal resistance test of the storage battery are ensured.
The module address setting unit is a dial switch, each single acquisition module is provided with an address setting dial switch, the communication address of the module is set in a binary mode, the circuit of the module is shown in figure 5, and the dial switch has 8 bits;
the module communication unit is composed of two parallel outlets of one RS485 communication chip, so that the modules of the single storage battery acquisition module can communicate and transmit data, and all the single modules of the whole group are connected in series in a hand-in-hand mode; the two single modules at the head and the tail of the whole group are communicated and accessed into the battery pack management module to form a loop communication mode, so that the fault of a certain module or the disconnection of a communication line can be effectively avoided, the data transmission and display of the whole group are not influenced, and the circuit of the module communication unit is shown in figure 6.
The first microcontroller unit is a single-chip microcomputer processor, as shown in fig. 2, the single-chip microcomputer of the embodiment is STM32F103C8T6, and SP706R in fig. 2 is a watchdog chip, so that the program is prevented from running away.
As shown in fig. 7, the storage battery management module includes a second microcontroller unit (MCU) and a passive dry contact unit (4-way DO) electrically connected to the second microcontroller unit, an address setting unit (dial), an RS485 communication unit, an ambient temperature acquisition unit, a battery charge/discharge current acquisition unit, a battery terminal voltage acquisition unit, and a battery separation bus detection unit, wherein:
the second microcontroller unit is a single-chip microcomputer processor, as shown in fig. 10, and adopts a single-chip microcomputer STM32F103RCT 6;
the address setting unit is a four-digit dial switch and sets the communication address of the management module in a binary technical mode;
the passive dry contact unit comprises a plurality of groups of relay control circuits, each relay control circuit comprises a photoelectric coupler, a driving triode and a relay which are connected in sequence, and in the embodiment, the circuit is shown in fig. 9; the passive dry contact unit has the main function that when equipment generates alarm information, the relay is closed, and a signal is sent to the background, so that a worker can quickly know the state of the battery pack and timely deal with the problem. Referring to fig. 9 and 10, when the pin TD-DO1, TD-DO2, TD-DO3 or TD-DO4 of the single chip microcomputer outputs a low level control signal, the photocoupler U14, U15, U26 or U27 works, the output end of the working photocoupler is connected to output a low level, the PNP triode connected with the output end of the photocoupler is conducted, 24 voltage of the emitter of the PNP triode is output to the relay, the relay is attracted, and a signal is sent to the background. As shown in fig. 9, the passive dry contact unit of this embodiment includes four passive dry contact circuits, which are voltage, temperature, internal resistance, and other alarm passive dry contact circuits.
The RS485 communication units are divided into two single acquisition module communication units and a display screen host communication unit; the unit is divided into a communication port with the single acquisition module and a communication port with the display screen host, and the single module communication ports are two, so that the whole group of modules form a loop in communication, and data transmission is faster and more reliable; the display screen communication interface is used for display screen communication, transmitting the data collected by the management module and the data of the single module to the host for display, and receiving a control command of the host.
The environment temperature acquisition unit is an NTC temperature sensor; high-precision reference voltage is designed inside, the voltage value of the NTC sensor is acquired in real time in a voltage dividing mode, the NTC resistance value is calculated according to a program algorithm, an accurate temperature value is calculated by using a table look-up method according to an NTC R-T table, two paths of acquisition are designed according to the environment temperature, and more accurate environment temperature is detected;
the battery pack charging and discharging current acquisition unit comprises a Hall current sensor, an inductor filter circuit, a differential amplification circuit and a voltage follower circuit which are connected in sequence; the circuit is shown in fig. 8, voltage signals H-Vout of the Hall current sensor are filtered by a capacitor, processed by a differential amplification circuit and a voltage following circuit and collected in a single chip microcomputer, and the charging and discharging current values of the battery pack are accurately collected.
The battery pack terminal voltage acquisition unit and the battery pack separation bus detection unit adopt a high-voltage-resistant optical coupling isolation circuit to acquire the battery pack terminal voltage and the battery pack bus voltage in real time, and adopt a high-voltage-resistant optical coupling isolation mode to acquire the battery pack terminal voltage and the battery pack bus voltage in real time, so that the interference of the battery pack is prevented from entering the module. The output end of the high-voltage-resistant optical coupling isolation circuit is sequentially connected with a filter circuit, a differential amplification circuit, a following circuit, an ADC circuit and a digital isolation chip, the isolation optical coupling of the second microcontroller unit gating the high-voltage-resistant optical coupling isolation circuit collects bus voltage and battery pack voltage at intervals, and after signal processing of the filter circuit, the differential amplification circuit, the following circuit, the ADC circuit and the digital isolation chip, the second microcontroller unit judges whether a battery pack bus is separated from the battery pack bus by comparing the bus voltage with the battery pack voltage.
As shown in fig. 11, the switching of the open channel of the optical coupler is controlled by V-chose1, V-chose2, V-chose3 and V-chose4 of the MCU, M +, M-, or Z +, Z-are conducted simultaneously to enter the filter circuit, the differential amplifier circuit and the follower circuit shown in fig. 12, and then enter a 24-bit high-precision ADC chip ADS1232IPW shown in fig. 13, and the ADC chip ADS1232IPW communicates with the MCU through an SPI digital isolation chip ISO7241C shown in fig. 14 to collect the battery pack voltage Z +, Z-, and the bus voltage M +, M-; the MCU compares the voltage Z + and Z-of the battery pack with the voltage M + and M-of the bus to obtain a differential pressure value; the theoretical bus voltage and the voltage difference of the battery pack are very small and can be regarded as equal. Considering the factors of line voltage drop and impedance, setting a differential pressure threshold value to be 2V; and if the acquired bus voltage and the voltage difference value of the battery pack are greater than 2V, judging that the bus of the battery pack is separated, and generating an alarm.
In this embodiment, the storage battery pack information display module can display 4 groups of battery data information at most, that is, the storage battery pack management module communicates with the storage battery pack information display module through RS485, and the display module displays data of the battery pack management module and the whole group of single acquisition modules. The system has signal and reputation warning function, the system can set up the transfinite threshold value, when monitoring the threshold value transfinite, it reports an emergency and asks for help or increased vigilance to show the host computer, storage battery management module exports alarm signal and sends for the customer, make things convenient for managers in time to inspect the system, guarantee the safety and stability of group battery, the record of reporting an emergency and ask for help or increased vigilance can be preserved to the while display module, save 5000 at most, can take notes concrete alarm time and report an emergency and ask for help or increased vigilance recovery time.
In a specific application, the single storage battery acquisition module of the application uses a 30cm acquisition line to be connected with a battery in parallel, so that the measurement error caused by the length of the line is avoided. When the single storage battery acquisition module is installed, a red line of an acquisition line is connected to the position of a positive pole of a battery, a black line of the acquisition line is connected to the negative pole of the battery, a 3.81 mm-pitch 6P terminal at the other end is connected to an acquisition port of the single acquisition module, and an address dial switch of the module is adjusted to dial a corresponding battery serial number address; the other end of the module is a communication port, the communication port adopts an RS485 mode, the 4P terminal with the 3.81mm interval is a parallel RS485 port, the 2P terminal with the 3.81mm interval is a DC5V power supply port of the RS485, the communication port adopts an isolation communication mode, and the work of each battery does not influence the work of other acquisition modules. The RS485 port of the first single storage battery acquisition module is connected with the RS485-2 port of the storage battery management module, the DC5V power supply of the communication port is provided by the storage battery management module and is connected to the DC5V power supply port of the first acquisition module, the parallel RS485 port of the first single storage battery acquisition module is connected with the RS485 port of the second acquisition module, and the communication power supply is connected to the communication power supply port of the second acquisition module in parallel; sequentially linking according to the 'hand-in-hand mode'; and the RS485 of the last single storage battery acquisition module is connected to the RS485-3 port of the storage battery pack management module. Meanwhile, the single storage battery acquisition module is provided with an operation fault indicator lamp, and the green lamp 1S in normal operation flickers once at intervals; when the module is in fault, the red fault lamp 1S flickers once for warning display.
In a specific application, the storage battery management module has the functions of group terminal voltage acquisition, bus voltage separation monitoring, group battery charging and discharging current acquisition, 2-path environment temperature acquisition, alarm dry contact output, RS485 communication and the like. The module adopts a metal shell, and mounting lugs are arranged on two black sides. The method comprises the steps of module group terminal voltage acquisition and bus voltage acquisition, wherein an optical coupling isolation method is adopted, the battery voltage enters an ADC acquisition circuit through an optical coupler, a 24-bit ADC acquires a voltage value at high precision, the optical coupling isolation prevents a battery signal from interfering equipment, a bus voltage disengagement threshold value is arranged inside the battery voltage isolation circuit, and a bus disengagement judgment system is used for judging that a bus is disengaged when the battery voltage exceeds the threshold value. The voltage signal of the Hall current sensor is filtered by an inductor, is processed in the single chip microcomputer through differential amplification and a voltage following circuit, and the charging and discharging current value of the battery pack is accurately acquired. The ambient temperature acquisition circuit adopts high accuracy reference voltage, and circuit voltage division mode gathers NTC both ends voltage, will gather the voltage value and gather the singlechip, and the singlechip is through looking up the table method, accurate slide rule ambient temperature value. The alarm main contact is designed with four passive main contacts, which are respectively used for voltage, temperature, internal resistance and other alarms, and the main contacts with different alarm information output alarm signals, so that the problem positioning problem can be found out quickly. And 3 paths of RS485 communication ports are designed, wherein the two paths are used for communicating with a single module to form a loop communication mode, the 3 rd path is used for communicating with a display screen or background display, and the data of the module and the data acquired by the module are transmitted to the display screen or background display software.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An on-line monitoring system for a storage battery monomer is characterized by comprising:
storage battery information display module, a plurality of monomer battery collection module and a plurality of storage battery management module, the communication connection in proper order between a plurality of monomer battery collection module, just two monomer battery collection module communications access storage battery management module of head and the tail of a plurality of monomer battery collection module, a plurality of storage battery management module and storage battery information display module communication connection, wherein:
the single storage battery acquisition module is used for acquiring single battery monitoring data of at least voltage, internal resistance and temperature of a single storage battery and sending the single battery monitoring data to the storage battery management module;
the storage battery management module is used for collecting at least battery pack charging and discharging current, battery pack terminal voltage, battery pack bus voltage, battery pack environmental temperature battery pack monitoring data and monocell monitoring data, and sending the battery pack monitoring data and the monocell monitoring data to the storage battery information display module;
and the storage battery pack information display module is used for displaying the battery pack monitoring data and the single battery monitoring data.
2. The battery cell online monitoring system of claim 1, wherein the plurality of cell battery acquisition modules, the cell battery acquisition module and the battery pack management module, and the battery pack management module and the battery pack information display module are all connected by RS485 communication.
3. The battery cell online monitoring system of claim 1, wherein the cell battery collection module comprises a voltage collection unit, a temperature collection unit, an internal resistance collection unit, a module address setting unit, a module communication unit, and a first microcontroller unit, and the voltage collection unit, the temperature collection unit, the internal resistance collection unit, the module address setting unit, and the module communication unit are all connected to the first microcontroller unit, wherein:
the voltage acquisition unit acquires the voltage of the battery by adopting a voltage amplification circuit based on an operational amplifier, and the voltage amplification circuit is connected with the first microcontroller unit through an ADC (analog to digital converter) chip;
the temperature acquisition unit adopts an NTC temperature sensor;
the internal resistance acquisition unit is a constant current circuit;
the module address setting unit is a dial switch;
the module communication unit comprises two parallel outlets of one RS485 communication chip;
the first microcontroller unit is a single chip processor.
4. The battery cell online monitoring system of claim 3, wherein the voltage acquisition unit and the internal resistance acquisition unit adopt a four-wire system.
5. The battery cell online monitoring system of claim 1, wherein the battery pack management module comprises a second microcontroller unit, and a passive dry contact unit, an address setting unit, an RS485 communication unit, an ambient temperature acquisition unit, a battery pack charging and discharging current acquisition unit, a battery pack terminal voltage acquisition unit, and a battery pack disconnection bus detection unit electrically connected to the second microcontroller unit, wherein:
the second microcontroller unit is a singlechip processor;
the address setting unit is a four-bit dial switch;
the passive dry contact unit comprises a plurality of groups of relay control circuits, and each relay control circuit comprises a photoelectric coupler, a driving triode and a relay which are connected in sequence;
the RS485 communication units are divided into two single acquisition module communication units and a display screen host communication unit;
the environment temperature acquisition unit is an NTC temperature sensor;
the battery pack charging and discharging current acquisition unit comprises a Hall current sensor, an inductor filter circuit, a differential amplification circuit and a voltage follower circuit which are connected in sequence;
the group end voltage acquisition unit and the battery pack separation bus detection unit adopt a high voltage-resistant optical coupling isolation circuit to acquire the battery pack end voltage and the battery pack bus voltage in real time.
6. The battery cell online monitoring system of claim 5, wherein the passive dry contact unit comprises four passive dry contact circuits, namely a voltage, a temperature, an internal resistance and other alarm passive dry contact circuits.
7. The storage battery monomer on-line monitoring system of claim 5, wherein a filter circuit, a differential amplifier circuit, a follower circuit, an ADC circuit and a digital isolation chip are connected in sequence behind the output end of the high voltage resistant optical coupling isolation circuit, the second microcontroller unit gates the isolation optical coupling isolation circuit of the high voltage resistant optical coupling isolation circuit to acquire the bus voltage and the battery pack voltage at intervals, and after signal processing of the filter circuit, the differential amplifier circuit, the follower circuit, the ADC circuit and the digital isolation chip, the second microcontroller unit judges whether the battery pack bus is disconnected by comparing the bus voltage with the battery pack voltage.
8. The storage battery cell online monitoring system according to claim 3, wherein the internal resistance acquisition unit is a closed-loop feedback constant current circuit, acquires a voltage Vmin at which a battery voltage drops to a lowest point when the storage battery is discharged, acquires a voltage V at an inflection point at which the battery voltage recovers after the discharge is completed, obtains a voltage variation value Δ U-V-Vmin of the storage battery, and then calculates an internal resistance value R- Δ U/I.
9. The battery cell online monitoring system of claim 1, wherein the cell battery collection module is connected in parallel with the battery using a collection wire.
10. The battery cell online monitoring system according to claim 1, wherein an overrun threshold corresponding to the battery pack monitoring data and the single cell monitoring data is set in the battery pack information display module, when the battery pack monitoring data and the single cell monitoring data exceed the threshold, the battery pack information display module gives an alarm, and the battery pack information display module stores the alarm information.
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| CN202110259086.XA CN113093023A (en) | 2021-03-09 | 2021-03-09 | Storage battery monomer on-line monitoring system |
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| CN202110259086.XA CN113093023A (en) | 2021-03-09 | 2021-03-09 | Storage battery monomer on-line monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114500466A (en) * | 2022-02-08 | 2022-05-13 | 易事特储能科技有限公司 | Address setting method of storage battery single acquisition module and battery management system |
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| CN114500466A (en) * | 2022-02-08 | 2022-05-13 | 易事特储能科技有限公司 | Address setting method of storage battery single acquisition module and battery management system |
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