CN112687092A - Lithium cell energy storage system's fire control early warning system - Google Patents
Lithium cell energy storage system's fire control early warning system Download PDFInfo
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- CN112687092A CN112687092A CN201911121400.7A CN201911121400A CN112687092A CN 112687092 A CN112687092 A CN 112687092A CN 201911121400 A CN201911121400 A CN 201911121400A CN 112687092 A CN112687092 A CN 112687092A
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Abstract
The invention discloses a fire-fighting early warning system of a lithium battery energy storage system, which is characterized in that a temperature sensor is arranged in a battery pack to monitor the temperature information of the battery pack and then transmit the temperature information to a BMS controller, the temperature information in the BMS controller is transmitted to a signal processing system through a CAN bus, and the signal processing system controls a fire-fighting injection valve according to the temperature value and the temperature change rate to realize fire-fighting agent injection, so that the prevention and fire-fighting functions are realized, the problem of delayed start of the traditional fire-fighting system under the condition that open fire occurs is avoided, and the power safety of the lithium battery energy storage system is ensured to the maximum extent; in addition, the BMS controller adopts a three-layer hierarchical control structure, and can realize temperature monitoring of a large-capacity multi-battery pack.
Description
Technical Field
The invention relates to the technical field of fire-fighting system safety, in particular to a fire-fighting early warning system of a lithium battery energy storage system.
Background
With the increase of power demand, in order to meet the normal operation of power plant equipment, user equipment and a power system, the power system sets a requirement for frequency control, and a lithium battery energy storage system combines two main characteristics of power density and energy density, is very suitable for frequency modulation of the power system, and in recent years, more and more lithium battery energy storage systems begin to provide support for the power system. The lithium battery energy storage is mainly applied to energy storage power supply power stations of power grids, communication, uninterruptible power supplies and the like. The lithium battery energy storage is generally operated in the form of a container, and at present, the lithium battery energy storage is mainly operated outdoors.
The energy storage of the lithium battery mainly comprises the fire hazard of the lithium battery and the fire hazard of electrical equipment. The fire of the lithium battery is mainly that electrolyte is heated, decomposed and combusted, and is a chemical reaction generated between materials in the battery due to the combustion of compound gas. The electrolyte decomposes a large amount of heats and is the battery out of control, leads to the electrolyte burning, and on large-scale lithium cell energy storage project, the battery module has the density height, concentrates the distributed characteristics, and a plurality of battery modules form large-scale energy storage system through the relation of connecting in series-parallel. Therefore, the probability of occurrence of faults of the lithium batteries is increased, and the circuit between the batteries cannot be cut off, so that the probability of fire occurrence is increased. The energy storage system is attached with a plurality of electrical devices, the cable with high voltage and high current is connected inside the energy storage system, if the cable generates heat for a long time and the high temperature can cause oxidation corrosion of electrical elements in the cabinet body, the cable cannot meet the resistance and insulation requirements of the original design, the whole energy storage system has great risk, and the probability of fire occurrence can be increased.
At present, most of fire fighting systems used on the energy storage system are additionally provided with common emergency fire fighting systems, the emergency fire fighting systems are separated from the energy storage lithium battery, and the energy storage system is not associated with the fire fighting systems. Such fire extinguishing system only is as a fire control equipment alone, can not detect the state of lithium cell, can not prevent in advance, still can not satisfy the requirement of lithium cell energy storage system to the fire control in the early warning function.
In order to solve the above technical problems, a fire-fighting early warning system of a lithium battery energy storage system is needed to solve the existing technical problems.
Disclosure of Invention
In view of the above defects of the prior art, an object of the present invention is to provide a fire-fighting early warning system for a lithium battery energy storage system, wherein a temperature sensor is installed inside a battery pack to monitor temperature information of the battery pack, and then the temperature information is transmitted to a BMS controller, the temperature information in the BMS controller is transmitted to a signal processing system through a CAN bus, and the signal processing system controls a fire-fighting injection valve to realize fire-fighting agent injection, so as to realize prevention and fire-fighting functions.
The invention is realized by the following technical scheme.
The utility model provides a lithium battery energy storage system's fire control early warning system, this lithium battery energy storage system's fire control early warning system includes: the battery PACK comprises a lithium battery PACK module, a BMS controller module and a signal processing system, wherein the BMS controller module is arranged in the lithium battery PACK module and used for acquiring the temperature information of a battery cell, and the signal processing system is used for processing a temperature signal and outputting a control signal;
the BMS controller module comprises a BMU unit, the BMU unit is arranged in the battery bin and is respectively and electrically connected with a temperature sensor tightly attached to the surface of the monomer battery cell and a primary voltage detection sensor arranged at the output end of the monomer battery cell, and the temperature and the voltage of the monomer battery cell are monitored.
Further, the BMS controller module further comprises a BCU unit, wherein the BCU unit is arranged in an upper box body in the packaging shell, receives the temperature value and the voltage value of the single battery cell detected by the BMU unit through a CAN bus, and detects the total voltage value of the battery pack consisting of a plurality of single battery cells.
Further, the BMS controller module further includes a BAU unit disposed within an upper box within the package housing; the BAU collects and summarizes temperature values and voltage values of single battery cells in the BCU and total voltage value information of the whole battery pack through the CAN bus, and communicates with the signal processing system through the CAN bus or a serial port communication or network port communication mode.
Furthermore, the lithium battery PACK module comprises a battery PACK consisting of a plurality of battery cells and a packaging shell arranged outside the battery PACK, wherein the packaging shell separates the battery PACK from the outside, a plurality of horizontal partition plates are arranged inside the packaging shell, a plurality of separated battery bins are formed between the partition plates and the partition plates, and the battery PACKs are arranged in one battery bin.
Furthermore, the packaging shell is in a container form, the battery packs are connected in parallel in pairs and then connected in series with the plurality of groups of battery packs connected in parallel in pairs so as to increase the capacity and high-voltage current output of the lithium battery energy storage system, a fire-fighting agent injection device is arranged in the packaging shell, and a fire-fighting injection electromagnetic valve is arranged on the fire-fighting agent injection device.
Further, the BMU unit includes: the system comprises a primary MCU, a primary battery monitoring chip and a primary CAN communication module; the side wall of each single battery cell is provided with a temperature sensor, and the temperature sensor is tightly attached to the outer surface of the battery cell; the primary battery monitoring chip is simultaneously electrically connected with the temperature sensor, the primary voltage detection sensor and the primary MCU, collects temperature and voltage signals of the battery core in real time, and transmits the collected temperature and voltage signals to the primary MCU; and the primary MCU stores the temperature and voltage signals and transmits the temperature and voltage signals to the BCU through the primary CAN communication module.
Further, the BCU unit includes: the system comprises a secondary voltage detection sensor, a secondary MCU, a secondary battery monitoring chip and a secondary CAN communication module; the secondary voltage detection sensor is electrically connected with the output end of the battery pack; the secondary battery monitoring chip is electrically connected with the secondary voltage detection sensor and the secondary MCU, collects voltage signals of the battery pack in real time and transmits the collected voltage signals to the secondary MCU; the primary CAN communication module is electrically connected with the secondary MCU, and the primary MCU transmits temperature and voltage signals of the monomer battery cell to the BCU through the primary CAN communication module; and the secondary MCU is electrically connected with the secondary CAN communication module and transmits temperature and voltage signals to the BAU unit through the secondary CAN communication module.
Further, the BAU unit includes: and the three-level MCU transmits the signals of the BCU unit to a signal processing system through the two-level CAN communication module.
Furthermore, the temperature sensor is an NTC thermistor, the primary battery monitoring chip is communicated with the primary MCU through a serial port communication mode, and the secondary battery monitoring chip is communicated with the secondary MCU through a serial port communication mode.
Further, the signal processing system comprises an acquisition module, a logic control module and a display module; the acquisition module is communicated with the three-level CAN communication module, and outputs an indication signal and receives data of the BAU unit;
furthermore, the display module is externally connected with an external display device and used for displaying the voltage, the temperature and the temperature change rate of the battery cell, the total voltage of the battery pack and the state of the fire-fighting injection electromagnetic valve.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the temperature sensor is arranged in the battery pack to monitor the temperature information of the battery pack, and then the temperature information is transmitted to the BMS controller, the temperature information in the BMS controller is transmitted to the signal processing system through the CAN bus, and the signal processing system controls the fire-fighting injection valve according to the temperature value and the temperature change rate to realize fire-fighting agent injection, so that the prevention and fire-extinguishing functions are realized, the problem of delayed starting of the traditional fire-fighting system under the condition that open fire occurs is avoided, and the electricity utilization safety of the lithium battery energy storage system is ensured to the greatest extent;
2. the BMS controller in the invention adopts a three-layer hierarchical control structure, and can realize temperature monitoring of a large-capacity multi-battery pack.
Drawings
FIG. 1 is a diagram of a fire early warning system of the present invention;
FIG. 2 is a schematic structural diagram of a lithium battery pack module according to the present invention;
FIG. 3 is a BUM module composition diagram;
fig. 4 is a diagram of a signal processing system.
In the figure: 1. a temperature sensor; 2. a fire-fighting injection solenoid valve; 4. a package housing; 5. a battery pack; 6. and (4) a box body.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
As shown in fig. 1 to 4, a fire-fighting early warning system of a lithium battery energy storage system comprises: lithium cell PACK module, BMS controller module and signal processing system.
The lithium battery PACK module comprises a battery PACK 5 consisting of a plurality of battery cells and a packaging shell 4 arranged outside the battery PACK 5; the pack case 4 separates the battery pack 5 from the outside;
meanwhile, a plurality of horizontally arranged partition plates are arranged in the packaging shell 4, a plurality of separated battery bins are formed between the partition plates, and the two battery packs 5 are arranged in one battery bin and are placed in a layered mode;
the package housing 4 may be in the form of a container.
In order to increase the capacity of the lithium battery energy storage system, the battery packs 5 are connected in parallel two by two;
in order to output high-voltage current, a plurality of groups of battery packs 5 connected in parallel two by two are connected in series.
A BMS controller is provided in the package case 4.
And a fire-fighting agent injection device is arranged in the packaging shell 4, and a fire-fighting injection electromagnetic valve 2 is arranged on the fire-fighting agent injection device.
The BMS controller module includes: BMU (Battery Management Unit), BCU (Battery Control Unit), BAU (Battery Analysis Unit);
the BMU is a bottom control level, is arranged in the battery bin, monitors the temperature and the voltage of the single battery cell, and transmits the temperature and the voltage information of the single battery cell to the upper BCU in real time through the CAN bus.
The BCU is the last control level of the BMU and is arranged in an upper box body 6 in the packaging shell 4;
the BCU collects temperature values and voltage values of the single battery cells detected by the BMUs, detects a total voltage value of the battery pack 5 consisting of the plurality of single battery cells, and transmits the temperature values and the voltage values of the single battery cells and the total voltage value of the whole battery pack 5 to the upper BAU through the CAN bus in real time.
BAU is the upper control level of BCU and is arranged in an upper box body 6 in the packaging shell 4;
the BAU collects and summarizes information of the BCU of the lower level, communicates with the signal processing system in a CAN bus mode, and also communicates with the signal processing system in a serial port communication or network port communication mode.
Specifically, the BMU includes: the device comprises a temperature sensor 1, a primary voltage detection sensor, a primary MCU (micro control unit), a primary battery monitoring chip and a primary CAN communication module;
the side wall of each single battery cell is provided with a temperature sensor 1, the temperature sensor 1 is tightly attached to the outer surface of the battery cell, and the temperature of the battery cell is sensed in a heat conduction mode.
The primary voltage detection sensor is electrically connected with the output end of the battery cell;
the primary battery monitoring chip is electrically connected with the temperature sensor 1 and the primary voltage detection sensor, and is used for acquiring temperature and voltage signals of the battery core in real time;
the primary battery monitoring chip is electrically connected with the primary MCU and transmits the acquired temperature and voltage signals to the primary MCU;
the primary MCU stores the temperature and voltage signals and transmits the temperature and voltage signals to the upper BCU through the primary CAN communication module;
the first-level CAN communication module sends and receives data on a CAN bus.
More specifically, the temperature sensor 1 is an NTC thermistor; mounting an NTC thermistor on the surface of the single battery cell to obtain the temperature of the battery cell;
the primary battery monitoring chip is a bq76PL45A chip and supports the measurement of 6-16 lithium ion batteries, including diamond, manganese and phosphate series lithium batteries and fuel batteries;
the primary MCU is an LPC845M301JBD64 chip and plays a role in main control and operation;
the LPC845M301JBD64 is a 32-bit microcontroller, is based on an ARM Cortex-MO core, has the highest frequency of 30MHz, and is provided with a 64KB ROM and a 16KB RAM;
the primary battery monitoring chip is communicated with the primary MCU in a serial port communication mode;
the output end of the NTC thermistor is connected with an AUX port of the bq76PL45A chip, namely, the temperature information acquired by the NTC thermistor is directly sent to the bq76PL45A chip for processing and then transmitted to the primary MCU in a serial port communication mode.
The primary CAN communication module adopts a TCAN450-q1 chip which has a transceiving function, so that messages CAN be sent and received under a CAN protocol; the sending of the message can be started by sending a command through the SPI; at this time, checking the communication status or the error message may be performed by reading the corresponding register.
The interrupt pins of TCAN450-q1 enhance the flexibility of the system, whether these pin functions are used or not is up to the user. These pins can be used to indicate whether a valid message is received or loaded into each receive buffer. If the user does not use these pins, the status register can also be accessed through the SPI interface to determine if a valid message has been received or loaded into each receive buffer.
The primary MCU controls the TCAN450-q1 to realize the transceiving of data on the CAN bus; an SPI communication mode is adopted between the primary MCU and the TCAN450-q 1; TCAN450-q1 has an FD controller and a transceiver; in an actual circuit, a 120 Ω resistor is connected in parallel between CANH and CANL of TCAN450-q1, which can filter out high frequency interference on the bus and also has a certain electromagnetic radiation protection effect.
Specifically, the BCU includes: the system comprises a secondary voltage detection sensor, a secondary MCU (micro control unit), a secondary battery monitoring chip and a secondary CAN communication module;
the secondary voltage detection sensor is electrically connected with the output end of the battery pack 5;
the secondary battery monitoring chip is electrically connected with the secondary voltage detection sensor and is used for acquiring a voltage signal of the battery pack 5 in real time;
the secondary battery monitoring chip is electrically connected with the secondary MCU and transmits the acquired voltage signal to the secondary MCU;
the primary CAN communication module is electrically connected with the secondary MCU, and the primary MCU transmits the temperature and voltage signals of the monomer cell to the upper BCU through the primary CAN communication module;
the second-level MCU is electrically connected with the second-level CAN communication module and transmits temperature and voltage signals to the upper-layer BAU through the second-level CAN communication module.
More specifically, the second-level MCU is an LPC845M301JBD64 chip and plays a role in main control and operation;
the secondary battery monitoring chip is a bq76PL45A chip;
the secondary battery monitoring chip is communicated with the secondary MCU in a serial port communication mode;
the secondary CAN communication module adopts a TCAN450-q1 chip.
The BAU includes: a three-level MCU (micro control unit) and a three-level CAN communication module;
and the three-level MCU transmits the lower-layer BCU to the signal processing system through the two-level CAN communication module.
The signal processing system takes a JCMC series controller as a hardware basis to realize the functions of software modules, and the software modules comprise: the device comprises an acquisition module, a logic control module and a display module.
The acquisition module is communicated with the three-level CAN communication module, outputs an indication signal and receives BAU data;
the display module is externally connected with an external display device and is used for displaying the voltage, the temperature and the temperature change rate of the battery cell, the total voltage of the battery pack 5 and the state of the fire-fighting injection electromagnetic valve 2.
The logic control module has a logic judgment function and compares the cell temperature with the standard temperature so as to calculate the change rate of the cell temperature, control the display module to display the change condition of the temperature and control the opening and closing states of the fire-fighting injection electromagnetic valve 2, and control the injection state of the fire-fighting agent.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a lithium battery energy storage system's fire control early warning system, its characterized in that, this lithium battery energy storage system's fire control early warning system includes: the battery PACK comprises a lithium battery PACK module, a BMS controller module and a signal processing system, wherein the BMS controller module is arranged in the lithium battery PACK module and used for acquiring the temperature information of a battery cell, and the signal processing system is used for processing a temperature signal and outputting a control signal;
the BMS controller module comprises a BMU unit, wherein the BMU unit is arranged in a battery bin and is respectively and electrically connected with a temperature sensor (1) tightly attached to the surface of the monomer battery cell and a first-level voltage detection sensor arranged at the output end of the monomer battery cell to monitor the temperature and the voltage of the monomer battery cell.
2. The fire-fighting early warning system of the lithium battery energy storage system according to claim 1, wherein the BMS controller module further comprises a BCU unit, the BCU unit is arranged in an upper box body (6) in the packaging shell (4), receives the temperature values and the voltage values of the single battery cells detected by the BMU unit through a CAN bus, and detects the total voltage value of a battery pack (5) consisting of a plurality of single battery cells.
3. The fire-fighting early-warning system for the lithium battery energy storage system according to claim 2, wherein the BMS controller module further comprises a BAU unit, the BAU unit is arranged in an upper box (6) in the packaging shell (4); the BAU collects and summarizes temperature values and voltage values of single battery cells in the BCU and total voltage value information of the whole battery pack through the CAN bus, and communicates with the signal processing system through the CAN bus or a serial port communication or network port communication mode.
4. A fire-fighting early-warning system for a lithium battery energy storage system according to any one of claims 1 to 3, characterized in that the lithium battery PACK module comprises a battery PACK (5) composed of a plurality of battery cells and a packaging casing (4) disposed outside the battery PACK (5), the packaging casing (4) separates the battery PACK (5) from the outside, a plurality of horizontally disposed partition boards are disposed inside the packaging casing, a plurality of partitioned battery compartments are formed between the partition boards, and two battery PACKs (5) are disposed in one battery compartment.
5. The fire-fighting early warning system of the lithium battery energy storage system according to claim 4, characterized in that the packaging shell (4) is in a container form, the battery packs (5) are connected in parallel in pairs and then are connected in series with a plurality of groups of battery packs connected in parallel in pairs so as to increase the capacity and high-voltage current output of the lithium battery energy storage system, a fire-fighting agent injection device is arranged in the packaging shell (4), and a fire-fighting injection electromagnetic valve (2) is arranged on the fire-fighting agent injection device.
6. The fire-fighting early warning system of the lithium battery energy storage system according to any one of claims 2 to 3, wherein the BMU unit comprises: the system comprises a primary MCU, a primary battery monitoring chip and a primary CAN communication module; the side wall of each single battery cell is provided with a temperature sensor (1), and the temperature sensor (1) is tightly attached to the outer surface of the battery cell; the primary battery monitoring chip is simultaneously electrically connected with the temperature sensor (1), the primary voltage detection sensor and the primary MCU, collects temperature and voltage signals of the battery core in real time, and transmits the collected temperature and voltage signals to the primary MCU; and the primary MCU stores the temperature and voltage signals and transmits the temperature and voltage signals to the BCU through the primary CAN communication module.
7. The fire-fighting early warning system of the lithium battery energy storage system according to claim 6, wherein the BCU unit comprises: the system comprises a secondary voltage detection sensor, a secondary MCU, a secondary battery monitoring chip and a secondary CAN communication module; the secondary voltage detection sensor is electrically connected with the output end of the battery pack (5); the secondary battery monitoring chip is electrically connected with the secondary voltage detection sensor and the secondary MCU, collects voltage signals of the battery pack (5) in real time and transmits the collected voltage signals to the secondary MCU; the primary CAN communication module is electrically connected with the secondary MCU, and the primary MCU transmits temperature and voltage signals of the monomer battery cell to the BCU through the primary CAN communication module; and the secondary MCU is electrically connected with the secondary CAN communication module and transmits temperature and voltage signals to the BAU unit through the secondary CAN communication module.
8. The fire-fighting early warning system of the lithium battery energy storage system according to claim 7, wherein the BAU unit comprises: and the three-level MCU transmits the signals of the BCU unit to a signal processing system through the two-level CAN communication module.
9. The fire-fighting early warning system of the lithium battery energy storage system according to claim 7, wherein the temperature sensor (1) is an NTC thermistor, the primary battery monitoring chip communicates with the primary MCU through a serial communication mode, and the secondary battery monitoring chip communicates with the secondary MCU through a serial communication mode.
10. The fire-fighting early warning system of the lithium battery energy storage system according to claim 7, wherein the signal processing system comprises an acquisition module, a logic control module and a display module; the acquisition module is communicated with the three-level CAN communication module, and outputs an indication signal and receives data of the BAU unit;
the display module is externally connected with an external display device and used for displaying the voltage, the temperature and the temperature change rate of the battery cell, the total voltage of the battery pack (5) and the state of the fire-fighting injection electromagnetic valve (2).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115206047A (en) * | 2022-05-24 | 2022-10-18 | 华能宁夏中卫光伏发电有限公司 | Photovoltaic module area fire prevention alarm method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115206047A (en) * | 2022-05-24 | 2022-10-18 | 华能宁夏中卫光伏发电有限公司 | Photovoltaic module area fire prevention alarm method and system |
| CN115206047B (en) * | 2022-05-24 | 2024-04-30 | 华能宁夏中卫光伏发电有限公司 | Fireproof alarm method and system for photovoltaic module area |
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