CN114639882A - Battery package thermal runaway protection system - Google Patents
Battery package thermal runaway protection system Download PDFInfo
- Publication number
- CN114639882A CN114639882A CN202210215093.4A CN202210215093A CN114639882A CN 114639882 A CN114639882 A CN 114639882A CN 202210215093 A CN202210215093 A CN 202210215093A CN 114639882 A CN114639882 A CN 114639882A
- Authority
- CN
- China
- Prior art keywords
- temperature
- battery
- thermal runaway
- battery module
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000443 aerosol Substances 0.000 claims abstract description 35
- 239000002904 solvent Substances 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 36
- 239000011810 insulating material Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 2
- 239000012774 insulation material Substances 0.000 claims 2
- 239000000155 melt Substances 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/03—Nozzles specially adapted for fire-extinguishing adjustable, e.g. from spray to jet or vice versa
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
Landscapes
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Public Health (AREA)
- Health & Medical Sciences (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a thermal runaway protection system for a battery pack, which comprises a linear temperature-sensing fire detector, a battery management main control unit and a hot aerosol fire extinguisher, wherein the linear temperature-sensing fire detector is connected with the battery management main control unit; the linear temperature-sensing fire detector is laid on the surface of the battery module and penetrates through the whole battery module and is used for detecting the surface temperature of the battery module; the battery management main control unit is respectively connected with the linear temperature-sensing fire detector and the hot aerosol fire extinguisher and is used for preventing the battery module from generating a thermal runaway condition; the hot aerosol fire extinguisher is used for spraying a solvent to the battery module to cool and/or extinguish fire when the battery module is out of control due to heat. The invention can realize the fire early warning covering the whole battery module, thereby greatly improving the electrical safety of the vehicle; in addition, the invention is not influenced by the flameout state of the vehicle, can implement 24-hour monitoring, has no power consumption in normal monitoring, and has more energy-saving monitoring mode.
Description
Technical Field
The invention relates to the technical field of automobile electrical safety, in particular to a thermal runaway protection system for a battery pack.
Background
For a long time, the electric automobile often has the accident of thermal runaway of the battery pack caused by fire, which brings serious safety risk to users. The national standardization regulatory committee has issued GB 38031-2020 Power storage Battery safety requirements for electric vehicles in 2020-05-12, wherein there are two requirements for thermal runaway: 1. the battery pack or system should provide a thermal event alarm signal 5min before the thermal diffusion due to the thermal runaway of a single battery and further the danger of the passenger compartment; 2. in the case where thermal runaway of a single battery causes thermal diffusion, a function or characteristic of protecting an occupant should be provided in a battery cell, a battery pack, or a vehicle.
At present, companies in the industry develop some technical schemes for thermal runaway detection and fire extinguishing. The following are more common: the system mainly comprises a negative temperature coefficient thermistor (NTC), a Battery Management System (BMS) main control and a fire extinguisher (as shown in figure 1). The NTC is disposed at a surface of the battery module for temperature detection. The BMS main control is responsible for judging whether the battery is out of control due to heat and driving the fire extinguisher to work. The fire extinguisher is used for extinguishing fire and reducing temperature by spraying a dissolving (powder) agent to a battery which generates thermal runaway. The whole vehicle is in a starting state, and a storage battery of the whole vehicle provides a working power supply for the system. And the BMS main control circularly collects the NTC temperature data in real time in a set time period. When the collected maximum temperature is larger than a set value and the temperature rise rate in a period of time is larger than the set value, the BMS judges that the battery at the collecting point is out of control thermally, then drives a fire extinguisher to spray a solvent (powder) agent to extinguish fire, and simultaneously sends an alarm signal to a Vehicle Control Unit (VCU).
However, existing thermal runaway detection and extinguishing systems suffer from the following disadvantages:
1. the effective range of NTC detection is small, and the whole battery module can not be detected in all directions by the NTC with limited quantity. If the number of NTCs is increased, a large cost increase is caused;
2. the system can work only when the vehicle is in a starting state, and the battery pack cannot be monitored and protected after the vehicle is shut down and powered off;
3. NTC belongs to the precision part, has special requirements to service environment, operating mode. If the package fails and water vapor enters, the parameter values of the package can be influenced, so that false alarm and false triggering of the system are caused.
Disclosure of Invention
In order to solve the technical problem, the invention provides a battery pack thermal runaway protection system which comprises a linear temperature-sensing fire detector, a battery management master control and a hot aerosol fire extinguisher;
the linear temperature-sensing fire detector is laid on the surface of the battery module, penetrates through the whole battery module and is used for detecting the surface temperature of the battery module;
the battery management main control unit is respectively connected with the linear temperature-sensing fire detector and the hot aerosol fire extinguisher and is used for preventing the battery module from generating a thermal runaway condition;
the hot aerosol fire extinguisher is used for spraying a solvent to the battery module to cool and/or extinguish fire when the battery module is out of control due to heat.
Optionally, the line-type temperature-sensing fire detector adopts a temperature-sensing cable, the temperature-sensing cable includes a plurality of metal wire cores coated by a heat-sensitive insulating material and isolated from each other, and when the temperature of a certain point rises to a certain value, the heat-sensitive insulating material is softened and melted to cause the plurality of metal wire cores at the point to be short-circuited.
Optionally, the plurality of metal wire cores are twisted in a double-helix shape at intervals.
Optionally, the length of the linear temperature-sensitive fire detector is not less than the length of the battery module.
Optionally, the length of the battery module is not more than 500mm, and the length of the line-type temperature-sensitive fire detector is 500mm-1000 mm.
Optionally, the linear temperature-sensing fire detector is laid linearly or in a curve; the linear temperature-sensing fire detector can be laid in a plurality of strips.
Optionally, the number of the metal wire cores in the temperature sensing cable is 2-4; the softening and melting temperature range of the heat-sensitive insulating material is 85-120 ℃.
Optionally, the battery management main control is connected with a storage battery, and the storage battery can adopt a DC12V or DC24V voltage value.
Optionally, the battery management main control unit includes a microprocessor, a positioning module and an execution module, and the microprocessor is connected to the temperature sensing cable, the positioning module and the execution module respectively;
the positioning module is internally provided with a three-dimensional model of the battery module, a simulation temperature sensing cable is correspondingly added on the three-dimensional model of the battery module according to the laying position of the temperature sensing cable, and when the thermal runaway of the battery module occurs, the thermal runaway point is positioned according to the short circuit resistance of the metal wire core in the temperature sensing cable;
a voltmeter and an ammeter are arranged on the metal wire core in the temperature sensing cable, and the voltmeter and the ammeter are connected with the microprocessor;
the hot aerosol fire extinguisher comprises a pressure spraying valve and a spray nozzle, the pressure spraying valve is connected with an execution module, the spray nozzle is provided with an adjusting frame, and the adjusting frame is connected with the execution module and is used for adjusting the spraying direction of the spray nozzle;
the microprocessor calculates the short-circuit resistance of the metal wire core in the temperature sensing cable according to the voltage value measured by the voltmeter and the current value measured by the ammeter, sends the short-circuit resistance to the positioning module, determines the solvent spraying direction and pressure by combining the positioning of the positioning module on the thermal runaway point and the position of the hot aerosol fire extinguisher, generates an instruction and sends the instruction to the execution module;
the execution module controls the adjusting frame to adjust the spray head to face the direction of the thermal runaway point according to the instruction, then controls the spray pressure valve to adjust the solvent spray pressure and simultaneously controls the adjusting frame to enable the spray head to swing left and right.
Optionally, the adjusting bracket comprises a rotating seat, a supporting frame, a servo motor, a supporting rod and a fixing clamp;
the bottom of the support frame is fixedly arranged at the upper end of the rotating seat, the upper end of the support frame is provided with a U-shaped groove, the support rod is positioned in the U-shaped groove, two ends of the support rod are arranged on the support frame through bearings, the servo motor is arranged on the support frame, and the servo motor is in transmission connection with the support rod;
the fixing clamp is annular and comprises an upper semi-ring and a lower semi-ring, the lower semi-ring is fixedly arranged on a supporting rod in a U-shaped groove, one end of the upper semi-ring is connected with one end of the lower semi-ring through a hinge, the other end of the upper semi-ring and the other end of the lower semi-ring can be opened or closed, and the fixing clamp is used for installing a spray nozzle of the hot aerosol fire extinguisher;
the rotary seat is internally provided with a driving motor, and the driving motor and the servo motor are electrically connected with the microprocessor.
When the intelligent fire extinguisher is used, the +12V positive pole and the-12V negative pole of a storage battery of a whole vehicle can be respectively connected with a POWER + terminal and a POWER-terminal of a Battery Management System (BMS) master control, the storage battery of the whole vehicle is used as a POWER supply of a protection system, the +12V positive pole of the storage battery is connected with a linear temperature-sensing fire detector, the-12V storage battery is connected with the negative pole of the hot aerosol fire extinguisher, and a high-side switch K1 of the Battery Management (BMS) master control is connected with the positive pole of the hot aerosol fire extinguisher; when the thermal runaway temperature of a single battery in the battery module reaches a specific temperature value of the temperature sensing cable, a main control of a Battery Management System (BMS) cuts off a main relay of a high-voltage loop after receiving a signal of a linear temperature sensing fire detector, and sends an alarm message to a VCU of the whole vehicle; in addition, the Battery Management (BMS) main control controls the hot aerosol fire extinguisher to extinguish fire and reduce temperature, so that the fire is prevented from further being out of control and spreading; the linear temperature-sensing fire detector adopted by the invention has a wide temperature range, the arrangement of the linear temperature-sensing fire detector is in a linear form, the linear temperature-sensing fire detector covers the whole battery module, and the thermal runaway of any monomer in the battery module can be detected; the defect of incomplete detection caused by NTC point-type interval arrangement is avoided, and the NTC can only detect the temperature of the monomer at the arrangement point, namely the NTC detection range is small; in addition, in the prior art, the temperature of the NTC needs to be acquired in real time to judge whether thermal runaway occurs, and the system can work only when the vehicle is in a starting state and a storage battery power supply is provided in real time; the invention is not influenced by the flameout state of the vehicle, the linear temperature-sensing fire detector can monitor without power consumption for 24 hours in normal time, and the monitoring does not need a power supply (without power consumption); the battery module has thermal runaway and the temperature reaches a specific value, and the linear temperature-sensing fire detector generates a signal and can monitor the flameout and starting states of the vehicle.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a thermal runaway detection and extinguishing system of the prior art;
fig. 2 is a schematic diagram of a thermal runaway protection system for a battery pack according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a temperature sensing cable used in an embodiment of the thermal runaway protection system for a battery pack according to the invention;
FIG. 4 is an electrical schematic diagram of an embodiment of a thermal runaway protection system for a battery pack of the invention;
fig. 5 is a schematic diagram of a battery management master control employed in an embodiment of a battery pack thermal runaway protection system of the invention;
fig. 6 is a schematic view of an adjusting bracket adopted by a spray nozzle of a hot aerosol fire extinguisher in an embodiment of the battery pack thermal runaway protection system of the invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 2, 3 and 4, an embodiment of the present invention provides a battery pack thermal runaway protection system, which includes a linear temperature-sensitive fire detector 1, a battery management main control 2 and a hot aerosol fire extinguisher 3;
the linear temperature-sensing fire detector 1 is laid on the surface of the battery module 4 and penetrates through the whole battery module 4, and is used for detecting the surface temperature of the battery module 4;
the battery management main control 2 is respectively connected with the linear temperature-sensing fire detector 1 and the hot aerosol fire extinguisher 3 through leads 5, the battery management main control 2 is also connected with a storage battery 6 of the whole vehicle through the leads 5, and the battery management main control 2 is used for preventing the battery module 4 from generating thermal runaway;
the hot aerosol fire extinguisher 3 is used for spraying a solvent to the battery module 4 to cool and/or extinguish fire when the battery module 4 is out of control due to heat.
The working principle and the beneficial effects of the technical scheme are as follows: in the implementation of the scheme, the positive electrode +12V and the negative electrode-12V of the storage battery of the whole vehicle can be respectively connected with a POWER + terminal and a POWER-terminal which are controlled by a Battery Management System (BMS), as shown in fig. 4, the storage battery of the whole vehicle is used as a POWER supply of a protection system, the positive electrode +12V of the storage battery is connected with a linear temperature-sensing fire detector, the storage battery-12V is connected with the negative electrode of a hot aerosol fire extinguisher, and a high-side switch K1 which is controlled by the Battery Management System (BMS) is connected with the positive electrode of the hot aerosol fire extinguisher; when the thermal runaway temperature of a single battery in the battery module reaches a specific temperature value of the temperature sensing cable, a main control of a Battery Management System (BMS) cuts off a main relay of a high-voltage loop after receiving a signal of a linear temperature sensing fire detector, and sends an alarm message to a VCU of the whole vehicle; in addition, the Battery Management (BMS) main control controls the hot aerosol fire extinguisher to extinguish fire and reduce temperature, so that the fire is prevented from further being out of control and spreading; the linear temperature-sensing fire detector has the advantages that the temperature range detected by the linear temperature-sensing fire detector is wide, the arrangement of the linear temperature-sensing fire detector is in a linear form, the linear temperature-sensing fire detector covers the whole battery module, and the thermal runaway of any single body in the battery module can be detected; the defect of incomplete detection caused by NTC point-type interval arrangement is avoided, and the NTC can only detect the temperature of the monomer at the arrangement point, namely the NTC detection range is small; in addition, in the prior art, the temperature of the NTC needs to be acquired in real time to judge whether thermal runaway occurs, and the system can work only when the vehicle is in a starting state and a storage battery power supply is provided in real time; the scheme is not influenced by the flameout state of the vehicle, the linear temperature-sensing fire detector can monitor the fire within 24 hours normally without power consumption, and the monitoring does not need a power supply (without power consumption); the battery module has thermal runaway and the temperature reaches a specific value, and the linear temperature-sensing fire detector generates a signal and can monitor the flameout and starting states of the vehicle.
In one embodiment, as shown in fig. 3, the line-type temperature-sensitive fire detector 1 employs a temperature-sensitive cable including a plurality of metal cores, a first metal core 11 and a second metal core 12 as shown, which are covered with a heat-sensitive insulating material and isolated from each other, and normally, the first metal core 11 and the second metal core 12 are isolated from each other in an off state; when the temperature of a certain point rises to a certain value, the heat-sensitive insulating material is softened and melted, so that a plurality of metal wire cores at the point are short-circuited; the plurality of metal wire cores are twisted in a double-helix shape at intervals.
The working principle and the beneficial effects of the technical scheme are as follows: the line type temperature-sensing fire detector in the scheme adopts a temperature-sensing cable, the temperature-sensing cable at least comprises two metal wire cores, namely a first metal wire core (No. 1 wire core) and a second metal wire core (No. 2 wire core), the positive electrode +12V of the storage battery is connected with the No. 1 wire core of the temperature-sensing cable in parallel, and then the No. 2 wire core of the temperature-sensing cable is connected to a detection point DI1 which is controlled by a Battery Management System (BMS); when the heat-sensitive insulating material is softened and melted, the two metal wire cores which are twisted in a double-helix shape at intervals are under the action of twisting stress, the heat-sensitive insulating material of the temperature sensing cable is automatically fused to enable the metal wire cores to be in short circuit, namely the metal wire cores are directly in short circuit together, so that an electric signal is generated and sent to a battery management main control; the first metal wire core and the second metal wire core in the temperature sensing cable are normally in a disconnected state, namely, electric energy does not need to be consumed; the double-helix type shape can generate twisting stress, when the temperature reaches a set value, the heat-sensitive insulating material is softened and melted, the first metal wire core and the second metal wire core are easy to contact and short-circuit under the action of the twisting stress, and the sensitivity of the temperature sensing cable is improved.
In one embodiment, the length of the line-type temperature-sensitive fire detector is not less than the length of the battery module; for example: if the length of the battery module is not more than 500mm, the length of the linear temperature-sensing fire detector is 500mm-1000 mm; the linear temperature-sensing fire detector is laid linearly or in a curve; the linear temperature-sensing fire detector can be laid in a plurality of strips.
The working principle and the beneficial effects of the technical scheme are as follows: the length of the linear temperature-sensing fire detector is determined by the length of the battery module, and the length of the linear temperature-sensing fire detector is limited to be not less than the length of the battery module, so that the linear temperature-sensing fire detector can cover the whole length of the battery module; the length of line type temperature-sensing fire detector can be the multifold of the length of battery module to make a round trip to lay many times at the battery module, thereby realize plane monitoring or multiaspect monitoring, further improve the comprehensive nature of monitoring and the degree of accuracy of thermal runaway point, improve the security.
In one embodiment, the number of the metal wire cores in the temperature sensing cable is 2-4; the softening and melting temperature range of the heat-sensitive insulating material is 85-120 ℃.
The working principle and the beneficial effects of the technical scheme are as follows: the temperature sensing cable of this scheme can adopt 2 ~ 4 wire cores, and during the use, the wire core is more, when the temperature reaches the setting value, more can ensure that the wire core takes place the short circuit, has improved the sensitivity of detection.
In one embodiment, the battery management master is connected to a storage battery, which may adopt a DC12V or DC24V voltage value.
The working principle and the beneficial effects of the technical scheme are as follows: the storage battery is arranged as a system power supply, so that the influence of vehicle flameout can be avoided, 24-hour monitoring is guaranteed, and the endurance time of a common storage battery is longer due to extremely low system power consumption under normal conditions; the storage battery can be a whole vehicle storage battery.
In one embodiment, as shown in fig. 5, the battery management main control includes a microprocessor 21, a positioning module 22 and an execution module 23, the microprocessor 21 is respectively connected with a temperature sensing cable, the positioning module 22 and the execution module 23, and the execution module 23 is connected with the hot aerosol fire extinguisher 3;
the positioning module 22 is internally provided with a three-dimensional model of the battery module, simulated temperature sensing cables are correspondingly added on the three-dimensional model of the battery module according to the laying positions of the temperature sensing cables, and when thermal runaway occurs in the battery module 4, a thermal runaway point is positioned according to the short circuit resistance of a metal wire core in the temperature sensing cable;
a voltmeter 24 and an ammeter 25 are arranged on a metal wire core in the temperature sensing cable, and both the voltmeter 24 and the ammeter 25 are connected with the microprocessor 21;
the hot aerosol fire extinguisher 3 comprises a pressure spraying valve 31 and a nozzle, the pressure spraying valve 31 is connected with the execution module 23, the nozzle is provided with an adjusting frame 32, and the adjusting frame 32 is connected with the execution module 23 and is used for adjusting the spraying direction of the nozzle;
the microprocessor 21 calculates the short-circuit resistance of the metal wire core in the temperature sensing cable according to the voltage value measured by the voltmeter 24 and the current value measured by the ammeter 25 and sends the short-circuit resistance to the positioning module 22, and determines the solvent spraying direction and pressure by combining the positioning of the thermal runaway point by the positioning module 22 and the position of the hot aerosol fire extinguisher 3, generates an instruction and sends the instruction to the execution module;
the execution module 23 controls the adjusting bracket 32 to adjust the spray head to the direction of the thermal runaway point according to the instruction, then controls the spray pressure valve 31 to adjust the solvent spray pressure and simultaneously controls the adjusting bracket 32 to enable the spray head to swing left and right.
The working principle and the beneficial effects of the technical scheme are as follows: according to the scheme, the positioning module is arranged to position the thermal runaway point, the voltmeter and the ammeter are used for detecting the short-circuit voltage and current of the temperature sensing cable, the microprocessor is used for calculating the short-circuit resistance, and the resistance is in direct proportion to the length of the metal wire core, and the battery module three-dimensional model and the laying position of the temperature sensing cable are combined, so that the accurate positioning of the thermal runaway point can be realized; the spray head is installed through the adjusting frame, the solvent spraying direction and pressure are determined according to the positioning of the thermal runaway point, the spray direction of the spray head to the solvent is adjusted through the adjusting frame, and the pressure of solvent spraying is ensured through controlling the spray pressure valve; can realize accurate putting out a fire and cooling, avoid the pressure of solvent injection to mismatch and lead to putting out a fire and cooling to the thermal runaway point to appear the deviation, improve vehicle security.
In one embodiment, as shown in fig. 6, the adjusting bracket 32 includes a rotating base 321, a supporting bracket 322, a supporting rod 324, a servo motor 325 and a fixing clip 326;
the bottom of the support frame 322 is fixedly installed at the upper end of the rotating base 321, the upper end of the support frame 322 is provided with a U-shaped groove 323, the support rod 324 is located in the U-shaped groove 323, two ends of the support rod 324 are installed on the support frame 322 through bearings, the servo motor 325 is installed on the support frame 322, and the servo motor 325 is in transmission connection with the support rod 324;
the fixing clip 326 is annular and comprises an upper half ring and a lower half ring, the lower half ring is fixedly arranged on the supporting rod 324 in the U-shaped groove 323, one end of the upper half ring is connected with one end of the lower half ring through a hinge, the other end of the upper half ring and the other end of the lower half ring can be opened or closed, and the fixing clip 326 is used for installing a spray head of the hot aerosol fire extinguisher 3;
the rotary seat 321 is provided with a driving motor therein, and the driving motor and the servo motor 325 are electrically connected to the microprocessor 21.
The working principle and the beneficial effects of the technical scheme are as follows: according to the scheme, the fixing clamp of the adjusting frame is used for clamping the spray head, the spray head is horizontally rotated for 360 degrees by adopting the rotation of the rotating seat, and the servo motor drives the supporting rod to drive the fixing clamp to realize the rotation of the spray head in the vertical direction; the coverage area of the spray head can be enlarged by adopting the adjusting frame, and fixed-point fire extinguishing and cooling of a thermal runaway point are realized.
In one embodiment, the microprocessor 21 determines the direction and pressure of the solvent spray by:
firstly, establishing a coordinate system by taking the position of a spray nozzle of the hot aerosol fire extinguisher 3 as an original point;
secondly, guiding the positioning data of the thermal runaway point into a coordinate system to obtain a coordinate value of the thermal runaway point, and determining the solvent spraying direction according to the coordinate value of the thermal runaway point;
thirdly, calculating the horizontal distance between the thermal runaway point and a spray nozzle of the hot aerosol fire extinguisher by adopting the following formula:
in the above formula, D represents the horizontal distance between the thermal runaway point and the spray nozzle of the hot aerosol fire extinguisher; x and Y represent horizontal coordinate values of the thermal runaway point;
finally, the minimum pressure required for solvent injection is calculated using the following equation:
in the above formula, PminRepresents the minimum pressure required for solvent injection; n represents the roughness of the nozzle of the hot aerosol fire extinguisher; d represents the horizontal distance between the thermal runaway point and a spray nozzle of the hot aerosol fire extinguisher; ρ represents a solvent density; g represents the acceleration of gravity; h represents the height difference between the thermal runaway point and the spray head; r represents the inner diameter of the outlet of the spray head;
the microprocessor selects a pressure value not less than the calculated minimum pressure as the pressure of the solvent injection according to the situation.
The working principle and the beneficial effects of the technical scheme are as follows: according to the scheme, the coordinate system is established to carry out positioning and calculation so as to determine the direction and pressure of solvent injection, so that the control precision can be improved, the deviation of fire extinguishing and cooling of a thermal runaway point caused by mismatching of the pressure of the solvent injection is avoided, and the increase of risks or loss caused by the fact that the fire extinguishing and cooling cannot be carried out as soon as possible is avoided; the above formula reflects the correlation between the thermal runaway point and the position of the nozzle of the hot aerosol fire extinguisher to the required solvent injection pressure, and realizes the quantitative analysis of the position relation and the pressure, thereby improving the control precision, leading the system to accurately extinguish and cool the thermal runaway point at the first time, and eliminating hidden dangers or reducing risks and losses as early as possible.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A battery pack thermal runaway protection system is characterized by comprising a linear temperature-sensing fire detector, a battery management main control unit and a hot aerosol fire extinguisher;
the linear temperature-sensing fire detector is laid on the surface of the battery module and penetrates through the whole battery module and is used for detecting the surface temperature of the battery module;
the battery management main control unit is respectively connected with the linear temperature-sensing fire detector and the hot aerosol fire extinguisher and is used for preventing the battery module from generating a thermal runaway condition;
the hot aerosol fire extinguisher is used for spraying a solvent to the battery module to cool and/or extinguish fire when the battery module is out of control due to heat.
2. The system of claim 1, wherein the linear thermal fire detector is a temperature-sensitive cable, the temperature-sensitive cable comprises a plurality of metal wires covered by a thermal insulation material and isolated from each other, and when the temperature of a certain point rises to a certain value, the thermal insulation material softens and melts to short-circuit the plurality of metal wires at the point.
3. The battery pack thermal runaway protection system of claim 2, wherein the plurality of metal wire cores are twisted in a double helix shape spaced from one another.
4. The system of claim 1, wherein the length of the linear temperature-sensitive fire detector is not less than the length of the battery module.
5. The system of claim 1, wherein the battery module has a length of no greater than 500mm, and the linear temperature-sensitive fire detector has a length of 500mm to 1000 mm.
6. The battery pack thermal runaway protection system of claim 1, wherein the line-type temperature-sensitive fire detector is laid in a straight line or in a curve; the linear temperature-sensing fire detector can be laid in a plurality of strips.
7. The battery pack thermal runaway protection system of claim 2, wherein 2-4 metal wire cores in the temperature sensing cable; the softening and melting temperature range of the heat-sensitive insulating material is 85-120 ℃.
8. The system of claim 1, wherein the battery management master control is connected to a battery, and the battery can adopt a DC12V or DC24V voltage value.
9. The battery pack thermal runaway protection system of claim 2, wherein the battery management master control comprises a microprocessor, a positioning module and an execution module, and the microprocessor is connected with the temperature sensing cable, the positioning module and the execution module respectively;
the positioning module is internally provided with a three-dimensional model of the battery module, a simulation temperature sensing cable is correspondingly added on the three-dimensional model of the battery module according to the laying position of the temperature sensing cable, and when the thermal runaway of the battery module occurs, the thermal runaway point is positioned according to the short circuit resistance of the metal wire core in the temperature sensing cable;
a voltmeter and an ammeter are arranged on the metal wire core in the temperature sensing cable, and the voltmeter and the ammeter are connected with the microprocessor;
the hot aerosol fire extinguisher comprises a pressure spraying valve and a spray nozzle, the pressure spraying valve is connected with an execution module, the spray nozzle is provided with an adjusting frame, and the adjusting frame is connected with the execution module and is used for adjusting the spraying direction of the spray nozzle;
the microprocessor calculates the short-circuit resistance of the metal wire core in the temperature sensing cable according to the voltage value measured by the voltmeter and the current value measured by the ammeter, sends the short-circuit resistance to the positioning module, determines the solvent spraying direction and pressure by combining the positioning of the positioning module on the thermal runaway point and the position of the hot aerosol fire extinguisher, generates an instruction and sends the instruction to the execution module;
the execution module controls the adjusting frame to adjust the spray head to face the direction of the thermal runaway point according to the instruction, then controls the spray pressure valve to adjust the solvent spray pressure and simultaneously controls the adjusting frame to enable the spray head to swing left and right.
10. The battery pack thermal runaway protection system of claim 9, wherein the adjustment bracket comprises a rotating seat, a support bracket, a servo motor, a support rod and a retaining clip;
the bottom of the support frame is fixedly arranged at the upper end of the rotating seat, the upper end of the support frame is provided with a U-shaped groove, the support rod is positioned in the U-shaped groove, two ends of the support rod are arranged on the support frame through bearings, the servo motor is arranged on the support frame, and the servo motor is in transmission connection with the support rod;
the fixing clamp is annular and comprises an upper semi-ring and a lower semi-ring, the lower semi-ring is fixedly arranged on a supporting rod in a U-shaped groove, one end of the upper semi-ring is connected with one end of the lower semi-ring through a hinge, the other end of the upper semi-ring and the other end of the lower semi-ring can be opened or closed, and the fixing clamp is used for installing a spray nozzle of the hot aerosol fire extinguisher;
the rotary seat is internally provided with a driving motor, and the driving motor and the servo motor are electrically connected with the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210215093.4A CN114639882B (en) | 2022-03-07 | 2022-03-07 | Battery Bao Re runaway protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210215093.4A CN114639882B (en) | 2022-03-07 | 2022-03-07 | Battery Bao Re runaway protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114639882A true CN114639882A (en) | 2022-06-17 |
| CN114639882B CN114639882B (en) | 2024-04-16 |
Family
ID=81948760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210215093.4A Active CN114639882B (en) | 2022-03-07 | 2022-03-07 | Battery Bao Re runaway protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114639882B (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87200665U (en) * | 1987-01-17 | 1987-12-31 | 徐子叨 | Thermosensitive fire alarm wire |
| CN200987853Y (en) * | 2006-12-08 | 2007-12-12 | 成都神剑消防科技有限公司 | Table type supersonic speed dry powder fire-extinguisher |
| CN101256703A (en) * | 2008-03-31 | 2008-09-03 | 张陈 | Cable type linear temperature-sensing fire disaster detector |
| CN201138504Y (en) * | 2008-01-02 | 2008-10-22 | 沈阳美宝控制有限公司 | Parallel line type temperature-sensing fire disaster detector with discrete temperature sensing switch serially connected with resistor |
| CN102353320A (en) * | 2011-07-06 | 2012-02-15 | 宝钢发展有限公司 | Temperature sensing cable ranging method and range finder |
| CN104269568A (en) * | 2014-03-10 | 2015-01-07 | 青岛中阳消防科技有限公司 | Passive temperature-sensing sensing element |
| CN104318704A (en) * | 2014-10-11 | 2015-01-28 | 青岛中阳消防科技有限公司 | Switching linear passive temperature sensing element |
| CN204158920U (en) * | 2014-10-24 | 2015-02-18 | 江西凯马百路佳客车有限公司 | A kind of split type battery case automatic extinguishing device |
| CN204331969U (en) * | 2014-12-09 | 2015-05-13 | 江苏中实电子有限公司 | A kind of locate mode line-type heat detector |
| CN205127247U (en) * | 2015-11-06 | 2016-04-06 | 威特龙消防安全集团股份公司 | Temperature sensing self -starting formula aerosol extinguishing device |
| CN108646144A (en) * | 2018-07-25 | 2018-10-12 | 国家电网有限公司 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
| CN210250930U (en) * | 2019-05-23 | 2020-04-07 | 成都特隆美储能技术有限公司 | Battery module that possesses fire control function |
| CN211050772U (en) * | 2019-07-25 | 2020-07-21 | 北京中军安全科技有限公司 | Aerosol automatic fire extinguisher installed in fire retardant module |
| CN211087955U (en) * | 2019-11-15 | 2020-07-24 | 沈阳沈安探测技术有限公司 | Early warning cable |
| CN111672040A (en) * | 2020-06-18 | 2020-09-18 | 国网上海市电力公司 | Fire monitoring and fire extinguishing system of electrical cabinet |
| CN211835986U (en) * | 2020-03-21 | 2020-11-03 | 山东鼎梁消防科技有限公司 | Auxiliary water spraying device of fire-extinguishing water gun |
| CN112038560A (en) * | 2020-09-15 | 2020-12-04 | 重庆金康动力新能源有限公司 | Battery package thermal runaway early warning fire extinguishing systems |
| CN114069078A (en) * | 2020-07-30 | 2022-02-18 | 哲弗智能系统（上海）有限公司 | Lithium battery thermal runaway early warning system and lithium battery system |
-
2022
- 2022-03-07 CN CN202210215093.4A patent/CN114639882B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87200665U (en) * | 1987-01-17 | 1987-12-31 | 徐子叨 | Thermosensitive fire alarm wire |
| CN200987853Y (en) * | 2006-12-08 | 2007-12-12 | 成都神剑消防科技有限公司 | Table type supersonic speed dry powder fire-extinguisher |
| CN201138504Y (en) * | 2008-01-02 | 2008-10-22 | 沈阳美宝控制有限公司 | Parallel line type temperature-sensing fire disaster detector with discrete temperature sensing switch serially connected with resistor |
| CN101256703A (en) * | 2008-03-31 | 2008-09-03 | 张陈 | Cable type linear temperature-sensing fire disaster detector |
| CN102353320A (en) * | 2011-07-06 | 2012-02-15 | 宝钢发展有限公司 | Temperature sensing cable ranging method and range finder |
| CN104269568A (en) * | 2014-03-10 | 2015-01-07 | 青岛中阳消防科技有限公司 | Passive temperature-sensing sensing element |
| CN104318704A (en) * | 2014-10-11 | 2015-01-28 | 青岛中阳消防科技有限公司 | Switching linear passive temperature sensing element |
| CN204158920U (en) * | 2014-10-24 | 2015-02-18 | 江西凯马百路佳客车有限公司 | A kind of split type battery case automatic extinguishing device |
| CN204331969U (en) * | 2014-12-09 | 2015-05-13 | 江苏中实电子有限公司 | A kind of locate mode line-type heat detector |
| CN205127247U (en) * | 2015-11-06 | 2016-04-06 | 威特龙消防安全集团股份公司 | Temperature sensing self -starting formula aerosol extinguishing device |
| CN108646144A (en) * | 2018-07-25 | 2018-10-12 | 国家电网有限公司 | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system |
| CN210250930U (en) * | 2019-05-23 | 2020-04-07 | 成都特隆美储能技术有限公司 | Battery module that possesses fire control function |
| CN211050772U (en) * | 2019-07-25 | 2020-07-21 | 北京中军安全科技有限公司 | Aerosol automatic fire extinguisher installed in fire retardant module |
| CN211087955U (en) * | 2019-11-15 | 2020-07-24 | 沈阳沈安探测技术有限公司 | Early warning cable |
| CN211835986U (en) * | 2020-03-21 | 2020-11-03 | 山东鼎梁消防科技有限公司 | Auxiliary water spraying device of fire-extinguishing water gun |
| CN111672040A (en) * | 2020-06-18 | 2020-09-18 | 国网上海市电力公司 | Fire monitoring and fire extinguishing system of electrical cabinet |
| CN114069078A (en) * | 2020-07-30 | 2022-02-18 | 哲弗智能系统（上海）有限公司 | Lithium battery thermal runaway early warning system and lithium battery system |
| CN112038560A (en) * | 2020-09-15 | 2020-12-04 | 重庆金康动力新能源有限公司 | Battery package thermal runaway early warning fire extinguishing systems |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114639882B (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110265736B (en) | Energy storage power station battery management system with intelligent fire early warning function and early warning method | |
| CN105514527B (en) | A kind of ferric phosphate lithium cell heating device, accumulator and vehicle | |
| CN108995547A (en) | A kind of fire prevention intelligent charging spot and its control method | |
| CN110967642A (en) | Thermal runaway detection circuit and method | |
| CN114069078B (en) | Lithium battery thermal runaway early warning system and lithium battery system | |
| CN111969265B (en) | Power battery pack safety monitoring system and monitoring method for new energy automobile | |
| CN206379321U (en) | A kind of controlled fuse of multiple spot temperature detection | |
| CN207216819U (en) | A kind of train fire warning system and train | |
| CN112038560A (en) | Battery package thermal runaway early warning fire extinguishing systems | |
| CN203772306U (en) | Cable terminal integrated monitoring device | |
| CN109289136A (en) | A kind of rail traffic lithium battery automatic fire extinguishing system | |
| CN114639882B (en) | Battery Bao Re runaway protection system | |
| CN206781546U (en) | Multifunctional motor-driven automobile high-voltage electricity gas box | |
| CN108258340A (en) | A kind of battery system with gas monitoring apparatus | |
| US11456494B2 (en) | Method for early detection of an imminent overheating of at least one battery cell of a battery, detection device, and motor vehicle | |
| CN111211377B (en) | System and method for monitoring temperature of cylindrical lithium ion battery | |
| CN210427697U (en) | High-voltage power cable terminal on-line monitoring device | |
| CN110034538A (en) | A kind of dry reactor non-ionizing energy loss system | |
| CN212570511U (en) | Cable line intermediate head trouble early warning device | |
| CN206892245U (en) | A kind of intelligent jack box | |
| CN205564919U (en) | Lithium iron phosphate battery heating device, battery and vehicle | |
| CN209169322U (en) | Cover plate assembly for battery core and the battery core with it | |
| CN208385676U (en) | A kind of charging socket with temperature detecting function, charging plug and electric car | |
| CN112810447A (en) | New energy automobile thing networking protection system | |
| CN207217720U (en) | A kind of battery heating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |