CN217821810U - Fire prevention detection device - Google Patents

Abstract

The utility model provides a fire prevention detection device relates to fire prevention and detects technical field. This fire prevention detection device includes: the combustible gas sensor is used for detecting data of combustible gas released by the lithium battery at the initial stage of thermal runaway; the temperature smoke sensor comprises a temperature detection unit and a smoke detection unit which are connected and are respectively used for detecting the temperature of the lithium battery and smoke data in the environment; the controller is connected with the combustible gas sensor and the temperature smoke sensor and is used for acquiring data of the combustible gas, the temperature of the lithium battery and the smoke data; and the communication unit is connected with the controller and is used for transmitting the data of the controller to a battery management system and/or a fire-fighting host so as to control the stopping of charging and discharging of the lithium battery or start a fire-fighting device. The utility model discloses a conflagration prevention detection device can integrate the resource better, practices thrift the cost, reduces occupation space to be convenient for install.

Description

Fire prevention detection device

Technical Field

The utility model relates to a fire prevention detects technical field, especially relates to a fire prevention detection device.

Background

With the transformation and upgrading of energy consumption structures in China, the construction and planning of modern intelligent power grid systems taking energy storage technology as a core are increasingly gaining attention. Under the large background of realizing double carbon, the related industries and industrial chains of new energy, new material and environmental protection and the like standing in a tuyere meet historical development opportunities. The new energy generally refers to renewable energy developed and utilized on the basis of new technology, such as solar energy, wind energy, geothermal energy, hydrogen energy, nuclear energy and the like. These energy sources are collected and stored in lithium battery containers, which are generally called energy storage power stations. The energy storage unit takes a lithium ion battery as a basic constituent unit, and the lithium ion battery is an energy-containing substance and has hazardous essence in nature, particularly in a closed space. Therefore, the safety problem of lithium ion batteries is receiving more and more attention from all social circles. The lithium ion battery fire is greatly different from the common fire, and the lithium ion battery serving as an energy aggregate is easy to cause the chain combustion and explosion reaction of surrounding batteries after thermal runaway occurs.

At present, no unified technical standard is formed internationally for lithium ion battery fire. The research on the fire protection of the lithium ion battery energy storage system is still in a starting stage, the prior art lacks pertinence to lithium ion battery fires, and the prediction and early warning of the lithium ion battery fires, the fire separation, the functional design and the setting scheme of fire extinguishing facilities and the like are also to be perfected. The fire prevention scheme of the energy storage power station on the market at present is mainly carried out in a mode of adding the traditional smoke detector and the traditional temperature sensor to the traditional combustible gas detector, namely, the fire prevention and control scheme of the existing energy storage power station generally comprises two sets of equipment, wherein one set of equipment is the combustible gas detector and the combustible gas controller, and the other set of equipment is the fire detector (smoke detector and temperature sensor) and the fire controller. The two sets of the fire extinguishing systems jointly form a fire extinguishing system of the energy storage power station. Because each detector is designed independently and does not have good integrated resources, the scheme has high cost, large occupied space and complex installation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a conflagration prevention detection device can integrate the resource better, practices thrift the cost, reduces occupation space to the installation of being convenient for.

It is another object of the present invention to quickly measure very low concentrations of CO and H2.

It is a further object of the present invention to enhance the electromagnetic interference resistance of the system.

According to the utility model discloses a purpose, the utility model provides a fire prevention detection device, include:

the combustible gas sensor is used for detecting data of combustible gas released by the lithium battery at the initial stage of thermal runaway;

the temperature smoke sensor comprises a temperature detection unit and a smoke detection unit which are connected and are respectively used for detecting the temperature of the lithium battery and smoke data in the environment;

the controller is connected with the combustible gas sensor and the temperature smoke sensor and is used for acquiring data of the combustible gas, the temperature of the lithium battery and the smoke data; and

and the communication unit is connected with the controller and is used for transmitting the data of the controller to a battery management system and/or a fire-fighting host so as to control the stopping of charging and discharging of the lithium battery or start a fire-fighting device.

Optionally, the combustible gas sensor comprises a CO sensor and an H2 sensor for detecting the concentration of CO and the concentration of H2, respectively.

Optionally, the combustible gas sensor comprises:

the combustible gas sensor circuit comprises a combustible gas probe and a combustible gas sensor circuit, wherein the combustible gas probe is used for detecting the concentration of the combustible gas;

a temperature compensation circuit including a thermistor;

and the combustible gas main control unit is connected with the combustible gas sensor circuit and the temperature compensation circuit.

Optionally, the combustible gas sensor circuit further includes a drop detection port for detecting a voltage at the combustible gas probe, and the drop detection port is connected to the combustible gas main control unit, so that the combustible gas main control unit can obtain information about whether the combustible gas probe drops.

Optionally, the communication unit includes a CAN bus transceiver unit and a 485 dedicated transceiver unit, which are respectively used for being in communication connection with the battery management system and the fire-fighting host.

Optionally, the fire prevention detection device further comprises:

and the display unit is connected with the controller and used for carrying out corresponding display according to the display control information of the controller.

Optionally, the fire prevention detection device further comprises:

and the infrared communication unit is connected with the controller, is in communication connection with the infrared remote controller and is used for receiving the infrared signal sent by the infrared remote controller.

Optionally, the fire prevention detection device further comprises:

and the Flash chip is connected with the controller and used for storing alarm information and time information.

Optionally, the fire prevention detection device further comprises:

and the power supply module is used for converting preset voltage into a voltage value which can be used by each device and circuit of the fire prevention detection device.

Optionally, the power module includes protection circuit, filter circuit and the anti-reverse connection circuit that connects gradually, protection circuit is used for preventing thunderbolt and surge and includes inductance, piezo-resistor and electric capacity, piezo-resistor with the electric capacity parallelly connected back with the inductance is established ties, filter circuit with the anti-reverse connection circuit is used for anti-jamming and preventing the power reversal respectively.

According to the utility model discloses an embodiment, fire prevention detection device has included combustible gas sensor and temperature smoke sensor, can detect the combustible gas's of lithium cell in the initial stage release of thermal runaway data, the smog condition in lithium cell temperature and the environment, combustible gas sensor and temperature smoke sensor all link to each other with the controller, the controller still links to each other with battery management system and fire control host computer respectively through communication unit, consequently can appear thermal runaway's initial stage at the lithium cell, in time inform battery management system and fire control host computer when smog appears in high temperature and the environment, prevent the conflagration. Because this fire prevention detection device has integrateed combustible gas sensor and temperature smoke transducer, consequently can integrate the resource better, practice thrift the cost, reduce occupation space to the installation of being convenient for.

According to the utility model discloses an embodiment adopts high sensitive CO sensor and H2 sensor to combine amplifier circuit, can measure very low CO and H2 of concentration fast.

According to the utility model discloses an embodiment, the power of controller and peripheral circuit's power have adopted a magnetic bead to keep apart, have all added decoupling capacitance at all VDD power supply pins of controller simultaneously, the anti-electromagnetic interference performance of reinforcing system.

According to the utility model discloses an embodiment can solve through chooseing for use each sensor of anti-jamming and survey trace H2 and CO problem of easily disturbing.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a block diagram of a fire prevention detection apparatus according to an embodiment of the present invention;

fig. 2 is a block diagram showing the construction of a fire prevention detection apparatus according to another embodiment of the present invention;

fig. 3 is a circuit diagram of a CO sensor circuit of a CO sensor of a fire prevention detection device according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a temperature compensation circuit of a CO sensor of a fire prevention detection apparatus according to an embodiment of the present invention;

fig. 5 is a circuit diagram of a CO master control unit of a CO sensor of a fire prevention detection device according to an embodiment of the present invention;

fig. 6 is a circuit diagram of a controller of a fire prevention detection device according to an embodiment of the present invention;

fig. 7 is a circuit diagram of a temperature detection unit of a fire prevention detection apparatus according to an embodiment of the present invention;

fig. 8 is a circuit diagram of a smoke detection unit of the fire prevention detection apparatus according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a smoke detecting unit of the fire prevention detection apparatus according to an embodiment of the present invention;

fig. 10 is a circuit diagram of a CAN bus transceiver unit of the fire prevention detection apparatus according to an embodiment of the present invention;

fig. 11 is a circuit diagram of a 485-specific transceiver unit of a fire prevention detection device according to an embodiment of the present invention;

fig. 12 is a circuit diagram of a display unit of a fire prevention detection apparatus according to an embodiment of the present invention;

fig. 13 is a circuit diagram of a second voltage reduction circuit of the fire prevention detection device according to an embodiment of the present invention;

fig. 14 is a circuit diagram of a first step-down circuit of a fire prevention detection device according to an embodiment of the present invention.

Reference numerals:

100-fire prevention detection device, 10-combustible gas sensor, 11-CO sensor, 111-CO sensor circuit, 112-temperature compensation circuit, 113-CO main control unit, 12-H2 sensor, 20-temperature smoke sensor, 21-temperature detection unit, 22-smoke detection unit, 30-controller, 40-communication unit, 41-CAN bus transceiving unit, 42-485 special transceiving unit, 50-display unit, 60-infrared communication unit, 70-Flash chip, 80-power module, 81-first voltage reduction circuit, 801-protection circuit, 802-filter circuit, 803-anti-reverse connection circuit, 82-second voltage reduction circuit and 90-relay.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Fig. 1 is a block diagram of a fire prevention detection apparatus 100 according to an embodiment of the present invention. As shown in fig. 1, in one embodiment, the fire prevention detection apparatus 100 includes a combustible gas sensor 10, a temperature smoke sensor 20, a controller 30, and a communication unit 40. The combustible gas sensor 10 is used for detecting data of combustible gas released by the lithium battery at the initial stage of thermal runaway, and specifically, the combustible gas may include CO or H2 gas. The temperature smoke sensor 20 comprises a temperature detection unit 21 and a smoke detection unit 22 which are connected to detect the temperature of the lithium battery and the smoke data in the environment, respectively. The controller 30 is connected to both the combustible gas sensor 10 and the temperature smoke sensor 20, and is configured to obtain data of the combustible gas, the temperature of the lithium battery, and smoke data. Of course, the controller 30 may process and judge the current state of the lithium battery according to the data transmitted through the combustible gas sensor 10 and the temperature smoke sensor 20. The communication unit 40 is connected to the controller 30, and is configured to transmit data of the controller 30 to the battery management system and/or the fire-fighting host, so as to control charging and discharging of the lithium battery or start the fire-fighting device. For example, when the concentration of the combustible gas released by the lithium battery is detected to be greater than a certain value, the controller 30 sends a control signal to the battery management system through the communication unit 40, the battery management system controls to stop charging and discharging the lithium battery, and when the temperature is detected to exceed the certain value or the concentration of smoke is detected to be greater than the certain value, the controller 30 sends the control signal to the fire-fighting host through the communication unit 40, so that the fire-fighting host controls the fire-fighting device to be started.

Fire prevention detection device 100 in this embodiment has included combustible gas sensor 10 and temperature smoke sensor 20, can detect the combustible gas's of lithium cell release at the initial stage of thermal runaway data, the smog condition in lithium cell temperature and the environment, combustible gas sensor 10 and temperature smoke sensor 20 all link to each other with controller 30, controller 30 still links to each other with battery management system and fire control host computer respectively through communication unit 40, consequently can appear the initial stage of thermal runaway at the lithium cell, in time inform battery management system and fire control host computer when smog appears in high temperature and the environment, prevent the conflagration. Since the fire prevention detection apparatus 100 integrates the combustible gas sensor 10 and the temperature smoke sensor 20, it is possible to better integrate resources, save costs, reduce an occupied space, and facilitate installation.

Fig. 2 is a block diagram of a fire prevention detection apparatus 100 according to another embodiment of the present invention. As shown in fig. 2, in one embodiment, the combustible gas sensor 10 includes a CO sensor 11 and an H2 sensor 12 for detecting the concentration of CO and the concentration of H2, respectively. Further, the combustible gas sensor 10 includes a combustible gas sensor 10 circuit, a temperature compensation circuit 112 and a combustible gas main control unit. The combustible gas sensor 10 circuit includes a combustible gas probe for detecting the concentration of combustible gas. The temperature compensation circuit 112 includes a thermistor. The combustible gas main control unit is connected with the combustible gas sensor 10 circuit and the temperature compensation circuit 112.

Fig. 3 is a circuit diagram of the CO sensor circuit 111 of the CO sensor 11 of the fire prevention detection device 100 according to an embodiment of the present invention. Fig. 4 is a circuit diagram of the temperature compensation circuit 112 of the CO sensor 11 of the fire prevention detection device 100 according to an embodiment of the present invention. Fig. 5 is a circuit diagram of the CO main control unit 113 of the CO sensor 11 of the fire prevention detection device 100 according to an embodiment of the present invention. Fig. 6 is a circuit diagram of the controller 30 of the fire prevention detection device 100 according to an embodiment of the present invention. As shown in fig. 3 to 5, in one embodiment, the CO sensor 11 includes a CO sensor circuit 111, a temperature compensation circuit 112, and a CO main control unit 113. As shown in fig. 3, the CO sensor circuit 111 includes a CO probe S1 for detecting the concentration of CO. The CO sensor 11 may be a hounwell precise electrochemical sensor, which can perform a chemical reaction on a target gas to generate a linear weak current output corresponding to a gas concentration, and then the linear weak current output is amplified by an amplifier (e.g., an amplifier U2.4 in fig. 3) and converted into a suitable voltage to be input to an a/D port of the controller 30, that is, a nADC1 port in fig. 3 is connected to a pin 17 of the CO main control unit 113. Also provided in FIG. 3 is a reference voltage circuit, which provides a reference voltage (i.e., connected to the port of V-BIAS in FIG. 3) to the CO sensor circuit 111 by using a 3.3V voltage to form a reference voltage supply terminal V-BIAS through the circuit consisting of capacitors C4 and C11 and amplifier U2.2. The reference voltage supply terminal V-BIAS of the reference voltage circuit may be connected to pin 14 of the CO master control unit 113 via a low pass filter. Pins 5 and 6 of the CO main control unit 113 are connected to pins 51 and 52 of the controller 30 to transmit information of CO detected by the CO sensor 11 to the controller 30, so that the controller 30 obtains calibration data, concentration data and the like of CO sensing through a serial port.

As shown in fig. 4, the temperature compensation circuit 112 includes a thermistor TH1, and certainly further includes an amplification circuit, which is implemented by an amplifier U2.1 in fig. 4, and the nacc 2 port of the temperature compensation circuit 112 is connected to the pin 16 of the CO main control unit 113, so as to perform temperature compensation through the thermistor TH1, suppress drift caused by an excessively high or excessively low ambient temperature to the CO sensor 11, and enhance the accuracy and stability of measurement, so as to ensure the measurement accuracy of CO.

In a further embodiment, as shown in fig. 3, the circuit of the combustible gas sensor 10 further includes a drop detection port SENS for detecting a voltage at the combustible gas probe, where the drop detection port SENS is connected to the pin 1 of the CO probe S1, and the drop of the combustible gas probe is determined by detecting whether the voltage is present at the pin 1. The drop detection port is connected with the combustible gas main control unit so that the combustible gas main control unit can obtain the information whether the combustible gas probe drops. For example, the drop detection port SENS is connected to the pin 15 of the CO main control unit 113 by connecting a low pass filter.

The H2 sensor 12 may use the same circuit as the CO sensor 11 to detect the H2 sensor 12, and only the CO probe S1 in fig. 3 needs to be replaced by a corresponding H2 probe, which is not described herein again. The signal output pins of the H2 sensor 12 may be connected to pins 29 and 30 of the controller 30 so that the controller 30 obtains calibration data as well as concentration data of the H2 sensor 12 via a serial port.

In the embodiment, the CO sensor 11 and the H2 sensor 12 with high sensitivity are combined with an amplifying circuit, so that CO and H2 with very low concentrations can be measured quickly.

As shown in fig. 6, the controller 30 may be a GD32F303RCT6 chip which is innovative and easy to use, the chip is packaged by LQFP-64, an ARM Cortex-M4 kernel is used, the maximum master frequency of the CPU reaches 120MHz, and the CPU has a ROM of 256K and a RAM of 48K, and has rich peripherals and strong performance. In order to ensure the stability of the operation of the controller 30, the design of the module isolates the power supply of the controller 30 from the power supply of the peripheral circuit by using a magnetic bead L3, and decoupling capacitors (C20-C25) of 100nF are added to all VDD power supply pins of the controller 30, so that the anti-electromagnetic interference performance of the system is enhanced.

Fig. 7 is a circuit diagram of the temperature detection unit 21 of the fire prevention detection apparatus 100 according to an embodiment of the present invention. As shown in fig. 7, in an embodiment, the temperature detecting unit 21 includes a temperature sensor H3, which may be an NTC temperature sensor with high cost performance, with parameters of 100K ± 1%, and a B value of 3950, and has the advantages of fast response speed, simple circuit, high measurement accuracy, and the like, and the NTC resistance value decreases with the increase of temperature, and according to this characteristic, the NTC resistance value may be directly divided by a voltage (R11) and then subjected to a/D conversion by the controller 30, and temperature data may be obtained by a program lookup and filtering. The NTC _ ADC pin of the temperature sensor H3 is connected to pin 9 of the controller 30 to transmit the measured temperature data to the controller 30.

Fig. 8 is a circuit diagram of the smoke detection unit 22 of the fire prevention detection device 100 according to an embodiment of the present invention. Fig. 9 is a schematic structural view of the smoke detection unit 22 of the fire prevention detection device 100 according to an embodiment of the present invention. As shown in fig. 8, the smoke detection unit 22 includes a smoke sensor H1, a conditioning circuit, and a smoke main control board CN3, and the smoke sensor H1 may adopt an integrated infrared smoke sensor. The conditioning circuit and the smoke master control board CN3 linearly convert the smoke concentration measured by the smoke sensor H1 into an AD value. Pins 2 and 3 of the smoke master CN3 are connected to pins 16 and 17 of the controller 30 so that the controller 30 can directly obtain smoke concentration data. The smoke detection unit 22 is connected to the pin 2 of the temperature sensor H3 through the pin 1 of the smoke master control board CN3, so that the smoke detection unit 22 and the temperature detection unit 21 are connected to one circuit board. As shown in fig. 9, the smoke detecting unit 22 is packaged as a device with 5 detecting ends protruding.

The problem that the trace amount of H2 and CO are easily interfered can be solved by selecting anti-interference sensors.

Fig. 10 is a circuit diagram of the CAN bus transceiving unit 41 of the fire prevention detection device 100 according to an embodiment of the present invention. Fig. 11 is a circuit diagram of the 485-dedicated transceiver unit 42 of the fire prevention detection device 100 according to an embodiment of the present invention. In one embodiment, the communication unit 40 includes a CAN bus transceiver unit 41 (see fig. 10) and a 485 specific transceiver unit 42 (see fig. 11) for communicating with the battery management system and the fire-fighting host, respectively. As shown in fig. 10, the CAN bus transceiver unit 41 includes a CAN bus transceiver U7, which may be a transceiver of MCP2551 type, and a CAN0_ RS port, a CAN0_ TX port, and a CAN0_ RX port of the CAN bus transceiver U7 are respectively connected to pins 57, 61, and 62 of the controller 30, so as to perform transceiving processing of CAN bus data communication, and implement communication with the battery management system. As shown in fig. 11, the 485-dedicated transceiver unit 42 includes a 485-dedicated transceiver U6 (a MAX3485 transceiver may be used), and a TX4_485 port, an RX4_485 port, and a 485/cs port of the 485-dedicated transceiver U6 are respectively connected to pins 53, 54, and 55 of the controller 30, so as to directly perform data transceiving, and meanwhile, bus interference can be suppressed by adding TVS transistors, fuses, capacitors, and other devices to the bus.

The fire prevention detection device 100 of this embodiment includes two kinds of bus communication modes of RS485 and CAN, CAN compatible most battery management system and fire control host computer on the market.

As shown in fig. 2, the fire prevention detection apparatus 100 further includes an infrared communication unit 6040 connected to the controller 30 and communicatively connected to the infrared remote controller for receiving an infrared signal transmitted from the infrared remote controller, and the infrared communication unit 6040 is connected to the pin 40 of the controller 30. The infrared communication unit 6040 may be an infrared receiver provided on the display panel of the display unit 50, and a general user may perform alarm point setting of four measurement amounts by a specific infrared remote controller, and a senior user may perform calibration of H2, CO, smoke, and the like.

Fig. 12 is a circuit diagram of the display unit 50 of the fire prevention detection device 100 according to an embodiment of the present invention. As shown in fig. 2, in one embodiment, the fire prevention detection apparatus 100 further includes a display unit 50 connected to the controller 30 for performing a corresponding display according to display control information of the controller 30. As shown in fig. 12, the display unit 50 employs two nixie tubes with four bits, which has the advantages of low cost and high stability, the driving chip of the nixie tube selects an LED driving chip TM1640 (U1) with two-wire serial interfaces (SCLK, DIN), pins SEG1 to SEG8 of the chip are connected to pins a to G of the nixie tube, pins GRID1 to GRID8 are connected to a pin DIG of the nixie tube, the interfaces LSCLK and LDIN of U1 are connected to pins 37 and 38 of the controller 30, and the single chip can control the content displayed by the nixie tube through a time sequence. The display panel of the display unit 50 may include a power indicator lamp, a fault indicator lamp, a low alarm indicator lamp, and a high alarm indicator lamp thereon, and the fact indicates the current state of the device.

As shown in fig. 2, the fire prevention detection apparatus 100 further includes a Flash chip 70 connected to the controller 30 for storing alarm information and time information. For example, the pins 20 to 23 of the controller 30 in fig. 6 are interfaces of SPI0 and are connected to the external FLASH chip 70, and the external 1M FLASH chip 70 may store data such as alarm information and time information of the detector.

Fig. 13 is a circuit diagram of the second voltage reduction circuit 82 of the fire prevention detection device 100 according to an embodiment of the present invention. Fig. 14 is a circuit diagram of the first voltage-reducing circuit 81 of the fire prevention detection device 100 according to an embodiment of the present invention. As shown in fig. 2, the fire prevention detection apparatus 100 further includes a power module 80 for converting a preset voltage into a voltage value usable by each device and circuit of the fire prevention detection apparatus 100. The power module 80 includes a first voltage dropping circuit 81 and a second voltage dropping circuit 82, the first voltage dropping circuit 81 is used for dropping the dc 24V voltage to 5V, and the second voltage dropping circuit 82 is used for dropping the dc 5V voltage to 3.3V. As shown in fig. 14, the first voltage-reducing circuit 81 filters and rectifies (prevents reverse connection) the direct current 24V voltage, and then reduces the voltage by the DCDC power chip U2 to obtain the 5V voltage required by the sensor, the display and other circuits, where the DCDC power module 80 is used because the DCDC power has the advantages of high working efficiency, wide input voltage range, low static power consumption and the like. As shown in fig. 13, the voltage of 5V is applied to the voltage of 3.3V required by each control chip (controller 30, each main control chip) via the chip U1 of the second voltage-dropping circuit 82.

Further, as shown in fig. 13, the power module 80 includes a protection circuit 801, a filter circuit 802, and an anti-reverse connection circuit 803, which are connected in sequence, where the protection circuit 801 includes an inductor L2, a varistor R4, and a capacitor C6, the varistor R4 and the capacitor C6 are connected in parallel and then connected in series with the inductor L2 for preventing lightning strike and surge, and the filter circuit 802 and the anti-reverse connection circuit 803 are respectively used for resisting disturbance and preventing reverse connection of power supply. First step-down circuit 81 has lightning protection promptly, prevents the surge, filters input clutter function, can effectually protect the power input line to receive external interference, keeps input voltage's continuation stable, can satisfy national standard electromagnetic compatibility's requirement.

The fire prevention detection device 100 of the embodiment performs the explosion-proof certification of the intrinsic safety type and the explosion-proof type combination, can meet the requirements of the use environment, and meets the explosion-proof requirements of the explosive environment.

As shown in fig. 6, further, pin 1 of the controller 30 may be connected to a button battery, so as to ensure that the controller 30 can normally time when the main power is turned off. Pins 3 and 4 of controller 30 are connected to a 32.768KHz crystal oscillator, which can provide a high-precision reference for timing controller 30. Pins 25 and 26 of the controller 30 control the output relay 90 and the audible and visual alarm. Pins 42, 43 of controller 30 are serial port 0, a print debug interface reserved for default. Pins 46, 49 of controller 30 are the SWD interface for programming and debugging.

During specific work, after the device is powered on, a short acousto-optic prompt is given, the equipment enters a preheating state after all the LEDs flicker, the digital tube has a countdown interface at the moment, preheating is finished when countdown is finished, and the equipment enters a monitoring state at the moment. 4 variables can be monitored in the monitoring state, the nixie tube rolls to display the data volume of H2, CO, temperature and smoke, the controller 30 displays the numerical value by polling detection values of the 4 sensors, and the data are stored in an internal register in real time. This detection device has the 485MODBUS agreement of standard, and other equipment CAN read measured data at any time through the RS485 bus, and these data also CAN be through the outside message that sends of CAN bus periodicity simultaneously, CAN communicate with BMS battery management system. The detection device has two-stage acousto-optic alarm function, and when any measured variable of H2, CO, temperature and smoke exceeds a corresponding alarm set value, a corresponding acousto-optic alarm is given out. The detection device has a fault detection function, and when a sensor probe and a mainboard have communication faults or a sensor falls off, equipment can light a fault indicator lamp.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A fire prevention detection device, comprising:

the combustible gas sensor is used for detecting data of combustible gas released by the lithium battery at the initial stage of thermal runaway;

the temperature smoke sensor comprises a temperature detection unit and a smoke detection unit which are connected and are respectively used for detecting the temperature of the lithium battery and smoke data in the environment;

the controller is connected with the combustible gas sensor and the temperature smoke sensor and is used for acquiring the data of the combustible gas, the temperature of the lithium battery and the smoke data; and

and the communication unit is connected with the controller and is used for transmitting the data of the controller to a battery management system and/or a fire-fighting host so as to control the stopping of charging and discharging of the lithium battery or start a fire-fighting device.

2. Fire prevention detection apparatus according to claim 1,

the combustible gas sensor comprises a CO sensor and an H2 sensor which are respectively used for detecting the concentration of CO and the concentration of H2.

3. A fire prevention detection device as recited in claim 1 wherein the combustible gas sensor comprises:

the combustible gas sensor circuit comprises a combustible gas probe and a combustible gas sensor circuit, wherein the combustible gas probe is used for detecting the concentration of the combustible gas;

a temperature compensation circuit including a thermistor;

and the combustible gas main control unit is connected with the combustible gas sensor circuit and the temperature compensation circuit.

4. A fire prevention detection device as defined in claim 3,

the combustible gas sensor circuit further comprises a falling detection port for detecting the voltage at the combustible gas probe, and the falling detection port is connected with the combustible gas main control unit so that the combustible gas main control unit can acquire the information whether the combustible gas probe falls off.

5. Fire prevention detection apparatus according to claim 1,

the communication unit comprises a CAN bus transceiving unit and a 485 special transceiving unit which are respectively used for being in communication connection with the battery management system and the fire-fighting host.

6. A fire prevention detection device as claimed in any one of claims 1 to 5 further comprising:

and the display unit is connected with the controller and is used for carrying out corresponding display according to the display control information of the controller.

7. A fire prevention detection apparatus as claimed in claim 6 further comprising:

and the infrared communication unit is connected with the controller, is in communication connection with the infrared remote controller and is used for receiving the infrared signals sent by the infrared remote controller.

8. A fire prevention detection apparatus as claimed in claim 7, further comprising:

and the Flash chip is connected with the controller and is used for storing alarm information and time information.

9. A fire prevention detection device as defined in claim 8, further comprising:

and the power supply module is used for converting preset voltage into a voltage value which can be used by each device and circuit of the fire prevention detection device.

10. Fire prevention detection apparatus according to claim 9,

the power module is including the protection circuit, filter circuit and the anti-reverse connection circuit that connect gradually, the protection circuit is used for preventing thunderbolt and surge and includes inductance, piezo-resistor and electric capacity, piezo-resistor with the electric capacity parallelly connected back with the inductance is established ties, filter circuit with the anti-reverse connection circuit is used for anti-jamming and prevents the power reversal respectively.

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