CN115025424B - Electric energy storage system of new energy vehicle - Google Patents
Electric energy storage system of new energy vehicle Download PDFInfo
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- CN115025424B CN115025424B CN202210959096.9A CN202210959096A CN115025424B CN 115025424 B CN115025424 B CN 115025424B CN 202210959096 A CN202210959096 A CN 202210959096A CN 115025424 B CN115025424 B CN 115025424B
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- 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
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D1/00—Devices using naturally cold air or cold water
- F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention relates to an electric energy storage system of a new energy vehicle, comprising: the closed battery accommodating box comprises a closed battery accommodating box, a lithium battery and a cooling and fire extinguishing system for cooling and extinguishing the lithium battery; the lithium battery is arranged in the closed battery accommodating box; the cooling and fire extinguishing system comprises: the device comprises a low-temperature medium containing box, a carbon dioxide fire extinguishing device, a fire extinguishing pipeline, a fire extinguishing electromagnetic valve, a blowing device, a battery box air inlet pipeline, a battery box air inlet flow meter, a battery box air inlet electromagnetic valve, a battery box air inlet one-way valve, a battery box exhaust pipeline, a battery box exhaust flow meter, a battery box exhaust electromagnetic valve, a medium box air inlet pipeline, a medium box air inlet electromagnetic valve, a medium box air outlet pipeline and a medium box air outlet electromagnetic valve; the electric energy storage system of the new energy vehicle has a working cooling state and an emergency fire extinguishing state. The invention has the advantages that the fire extinguishing can be completed in the electric energy storage system when a fire disaster occurs, and the fire disaster can be prevented from continuously burning and spreading to other parts of the vehicle.
Description
Technical Field
The invention relates to the technical field of new energy vehicles, in particular to an electric energy storage system of a new energy vehicle.
Background
The new energy automobile is an automobile which adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and is advanced in technical principle, novel in technology and novel in structure.
An electric automobile in a new energy vehicle is an automobile mainly driven by electric power as the name implies. The electric automobile manages and controls the electric energy stored in the electric energy storage system through the energy management system. The electric energy storage system is mainly composed of a battery pack. When a traffic accident occurs and the battery pack runs under strong impact or severe conditions, the temperature of the battery pack rises sharply, so that the danger of fire disaster possibly exists, and huge potential safety hazards are brought to the use of people.
Disclosure of Invention
The invention aims to provide an electric energy storage system of a new energy vehicle, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an electric energy storage system of a new energy vehicle, comprising: the device comprises a closed battery accommodating box, a lithium battery and a cooling and fire extinguishing system for cooling and extinguishing the lithium battery; the lithium battery is arranged in the closed battery accommodating box; the cooling and fire extinguishing system comprises: the low-temperature fire extinguishing system comprises a low-temperature medium containing box containing low-temperature fluid, a carbon dioxide fire extinguishing device for spraying carbon dioxide into the closed battery containing box to extinguish fire, a fire extinguishing pipeline, a fire extinguishing electromagnetic valve, a blowing device for blowing air into the closed battery containing box to cool a lithium battery, a battery box air inlet pipeline, a battery box air inlet flow meter, a battery box air inlet electromagnetic valve, a battery box air inlet one-way valve, a battery box exhaust pipeline, a battery box exhaust flow meter, a battery box exhaust electromagnetic valve, a medium box air inlet pipeline, a medium box air inlet electromagnetic valve, a medium box air outlet pipeline and a medium box air outlet electromagnetic valve; the bottom of the low-temperature medium accommodating box accommodates low-temperature fluid; the top of the low-temperature medium accommodating box forms an air cavity;
the fire extinguishing pipeline is communicated with the carbon dioxide fire extinguishing device and the closed battery accommodating box; the fire extinguishing electromagnetic valve is arranged on the fire extinguishing pipeline;
the battery box air inlet pipeline is communicated with the closed battery accommodating box and the blowing device; the battery box air inlet flow meter, the battery box air inlet electromagnetic valve and the battery box air inlet one-way valve are arranged on the battery box air inlet pipeline;
the battery box air inlet pipeline penetrates through the low-temperature medium accommodating box, part of the battery box air inlet pipeline is immersed into the low-temperature fluid, and the low-temperature fluid is used for cooling;
the battery box exhaust pipeline is communicated with the external atmosphere and the closed battery accommodating box; the battery box exhaust flowmeter and the battery box exhaust electromagnetic valve are arranged in the battery box exhaust pipeline;
the air inlet pipeline of the medium box is communicated with the closed battery accommodating box and the bottom of the low-temperature medium accommodating box; the medium box air inlet electromagnetic valve is arranged on the medium box air inlet pipeline;
the medium box air outlet pipeline is communicated with the external atmosphere and an air cavity at the top of the low-temperature medium accommodating box; the medium box air outlet electromagnetic valve is arranged on the medium box air outlet pipeline;
the electric energy storage system of the new energy vehicle has a working cooling state and an emergency fire extinguishing state;
when the low-temperature medium accommodating box is in a working cooling state, the medium box air inlet electromagnetic valve and the fire extinguishing electromagnetic valve are in a closed state, the battery box air inlet electromagnetic valve and the battery box exhaust electromagnetic valve are in an open state, the blowing device drives air to enter the closed battery accommodating box through the battery box air inlet pipeline and exhaust the air through the battery box exhaust pipeline, and air in the battery box air inlet pipeline enters the closed battery accommodating box after being cooled through the low-temperature medium accommodating box;
when in an emergency fire extinguishing state, the blowing device is closed, the battery box air inlet electromagnetic valve and the battery box exhaust electromagnetic valve are closed, the medium box air inlet electromagnetic valve, the fire extinguishing electromagnetic valve and the medium box air outlet electromagnetic valve are in an open state, carbon dioxide blown out by the carbon dioxide fire extinguishing device enters the closed battery containing box through the fire extinguishing pipeline, gas in the closed battery containing box is discharged into low-temperature fluid through the medium box air inlet pipeline, and then the low-temperature fluid passes through the air cavity and is discharged out of the medium box air outlet pipeline.
As a further scheme of the invention: when the time that the flow of the battery box exhaust flowmeter is larger than the flow of the battery box intake flowmeter reaches the preset time, the electric energy storage system of the new energy vehicle enters an emergency fire extinguishing state from a working cooling state.
As a further scheme of the invention: when the difference between the flow of the battery box exhaust flowmeter and the flow of the battery box intake flowmeter is larger than a preset flow threshold value, the electric energy storage system of the new energy vehicle enters an emergency fire extinguishing state from a working cooling state.
As a further scheme of the invention: the electric energy storage system of the new energy vehicle further includes a temperature detector for detecting a temperature in the closed battery accommodating box; the temperature detector is arranged in the closed battery accommodating box; when the temperature detected by the temperature detector is greater than a preset temperature threshold value, the electric energy storage system of the new energy vehicle enters an emergency fire extinguishing state from a working temperature reduction state.
As a further scheme of the invention: the air inlet pipeline of the battery box is communicated to the top of the closed battery accommodating box.
As a further scheme of the invention: the battery box exhaust pipeline is communicated to the bottom of one side, away from the battery box air inlet pipeline, of the closed battery accommodating box.
As a further scheme of the invention: the fire extinguishing pipeline is communicated to the top of the closed battery accommodating box.
As a further scheme of the invention: the medium box air inlet pipeline is communicated to one side, away from the fire extinguishing pipeline, of the closed battery accommodating box.
As a further scheme of the invention: the low-temperature fluid contained in the low-temperature medium containing box is water.
As a further scheme of the invention: in the air flow direction in the battery box air inlet pipeline, the battery box air inlet flow meter is positioned at the upstream of the battery box air inlet electromagnetic valve, and the battery box air inlet one-way valve is positioned at the downstream of the battery box air inlet electromagnetic valve.
Compared with the prior art, the invention has the beneficial effects that: when a fire disaster occurs, the fire extinguishing can be finished in the electric energy storage system, and the fire disaster is prevented from continuously burning and spreading to other parts of the vehicle.
The electric energy storage system of the new energy vehicle has a working cooling state and an emergency fire extinguishing state. During the work cooling state, cooling and fire extinguishing systems can cool down the lithium cell, prevent that its high temperature from damaging. Can in time put out a fire to the conflagration during emergent fire extinguishing state, prevent that the conflagration from continuously burning and spreading to other positions of vehicle to reduce the loss.
The low temperature medium that the low temperature medium held in the case both can cool down the air of inputing in the closed battery holding case at work cooling state, can hold the case cooperation with closed battery again, blocks the outside route of transmitting of naked light, effectively avoids the conflagration to stretch, accomplishes the operation of putting out a fire with the conflagration restriction in electric energy storage system, can in time put out a fire and reduce the conflagration loss.
Other features and advantages of the present invention will be disclosed in more detail in the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic view of an electric energy storage system of a new energy vehicle of the present invention;
FIG. 2 is a schematic illustration of a branch line of a fire suppression line of the electrical energy storage system of the new energy vehicle of FIG. 1;
fig. 3 is a flow chart of the electric energy storage system of the new energy vehicle in fig. 1 entering an emergency fire extinguishing state.
List of reference numerals: electric energy storage system 100 of new energy vehicle, closed battery container 10, lithium cell 20, cooling and fire extinguishing system 30, low temperature medium container 31, low-temperature fluid 311, air chamber 312, carbon dioxide extinguishing device 32, fire extinguishing piping 33, fire extinguishing solenoid valve 331, branch pipeline 332, blast apparatus 34, battery box air inlet pipeline 35, battery box air inlet flowmeter 351, battery box air inlet solenoid valve 352, battery box air inlet check valve 353, battery box exhaust pipeline 36, battery box exhaust flowmeter 361, battery box exhaust solenoid valve 362, medium box air inlet pipeline 371, medium box air inlet solenoid valve, medium box air outlet pipeline 38, medium box air outlet solenoid valve 381, and thermodetector 39.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, in an embodiment of the present invention, an electric energy storage system 100 of a new energy vehicle includes: a closed battery container 10, a lithium battery 20 and a cooling and fire extinguishing system 30.
The cooling and fire extinguishing system 30 is used to cool and extinguish a fire for the lithium battery 20. The lithium battery 20 is provided in the closed battery housing case 10. Specifically, the enclosed battery housing box 10 is made of a fireproof material. The lithium battery 20 is packaged in the closed battery accommodating box 10, and the cooling and fire extinguishing system 30 is communicated to the closed battery accommodating box 10, so that the complete electric energy storage system 100 of the new energy vehicle is formed.
As a preferred embodiment, the cooling and fire suppression system 30 includes: the low-temperature medium accommodating box 31, the carbon dioxide fire extinguishing device 32, the fire extinguishing pipeline 33, the fire extinguishing solenoid valve 331, the blowing device 34, the battery box air inlet pipeline 35, the battery box air inlet flow meter 351, the battery box air inlet solenoid valve 352, the battery box air inlet check valve 353, the battery box exhaust pipeline 36, the battery box exhaust flow meter 361, the battery box exhaust solenoid valve 362, the medium box air inlet pipeline 37, the medium box air inlet solenoid valve 371, the medium box air outlet pipeline 38 and the medium box air outlet solenoid valve 381.
The low-temperature medium accommodating tank 31 accommodates a low-temperature fluid 311. The carbon dioxide fire extinguishing device 32 is used to spray carbon dioxide into the enclosed battery housing box 10 to extinguish fire. The blowing device 34 is used to blow air into the enclosed battery accommodating case 10 to cool the lithium battery 20. The cryogenic fluid 311 in the cryogenic medium-containing tank 31 can be cooled by a refrigeration device. As an alternative embodiment, the cryogenic fluid may be used as the refrigeration medium of the refrigeration device. As a specific embodiment, the cryogenic fluid 311 contained in the cryogenic medium-containing tank 31 is water. The bottom of the cryogenic medium-containing tank 31 contains cryogenic fluid 311. The top of the low temperature medium accommodating tank 31 constitutes an air chamber 312. That is, the cryogenic fluid 311 does not completely fill the entire cryogenic medium containing tank 31, and the cryogenic fluid 311 only covers the bottom of the cryogenic medium containing tank 31 and the upper side is air.
As a specific embodiment, the fire extinguishing piping 33 communicates the carbon dioxide fire extinguishing device 32 and the closed battery housing box 10. The fire extinguishing solenoid valve 331 is provided on the fire extinguishing line 33.
Specifically, the battery box intake duct 35 communicates the closed battery accommodating box 10 and the blower device 34. A battery box inlet flow meter 351, a battery box inlet solenoid valve 352 and a battery box inlet check valve 353 are provided on the battery box inlet line 35.
Specifically, the battery box inlet line 35 passes through the low-temperature medium accommodating box 31 and the battery box inlet line 35 is partially immersed in the low-temperature fluid 311, and is cooled by the low-temperature fluid 311.
Specifically, the battery box exhaust line 36 communicates the outside atmosphere with the closed battery housing box 10. A battery case exhaust flow meter 361 and a battery case exhaust solenoid valve 362 are provided in the battery case exhaust line 36.
Specifically, the medium tank inlet pipe 37 communicates the closed battery accommodating case 10 with the bottom of the low temperature medium accommodating case 31. A medium tank intake solenoid valve 371 is provided on the medium tank intake line 37.
Specifically, the media tank outlet line 38 communicates the outside atmosphere with the air chamber 312 at the top of the cryogenic media holding tank 31. A medium tank outlet solenoid valve 381 is provided on the medium tank outlet line 38.
As a preferred embodiment, the electric energy storage system 100 of the new energy vehicle has a work cool-down state and an emergency fire extinguishing state.
In the working cooling state, the medium box air inlet solenoid valve 371 and the fire extinguishing solenoid valve 331 are in the closed state, the battery box air inlet solenoid valve 352 and the battery box air outlet solenoid valve 362 are in the open state, the blowing device 34 drives air to enter the closed battery accommodating box 10 through the battery box air inlet pipeline 35 and to be discharged through the battery box air outlet pipeline 36, wherein the air in the battery box air inlet pipeline 35 enters the closed battery accommodating box 10 after being cooled through the low-temperature medium accommodating box 31.
In the emergency fire extinguishing state, the blower 34 is closed and the battery box intake solenoid valve 352 and the battery box exhaust solenoid valve 362 are closed, the medium box intake solenoid valve 371, the fire extinguishing solenoid valve 331 and the medium box exhaust solenoid valve 381 are open, the carbon dioxide fire extinguishing device 32 blows carbon dioxide into the closed battery accommodating box 10 via the fire extinguishing line 33, and gas in the closed battery accommodating box 10 is discharged into the cryogenic fluid 311 via the medium box intake line 37 and then discharged from the medium box exhaust line 38 through the air chamber 312.
As a preferred embodiment, when the time that the flow rate of the battery box exhaust flow meter 361 is greater than the flow rate of the battery box intake flow meter 351 reaches the preset time, the electric energy storage system 100 of the new energy vehicle enters the emergency fire extinguishing state from the working cooling state.
In a preferred embodiment, when the difference between the flow rate of the battery box exhaust flow meter 361 and the flow rate of the battery box intake flow meter 351 is greater than a preset flow rate threshold value, the electric energy storage system 100 of the new energy vehicle enters an emergency fire extinguishing state from a work cooling state.
As a preferred embodiment, the electric energy storage system 100 of the new energy vehicle further includes a temperature detector 39 for detecting the temperature inside the closed battery housing box 10. The temperature detector 39 is provided inside the closed battery housing case 10. When the temperature detected by the temperature detector 39 is greater than the preset temperature threshold value, the electric energy storage system 100 of the new energy vehicle enters an emergency fire extinguishing state from a working cooling state.
When the system normally works, the electric energy storage system 100 of the new energy vehicle is in a working cooling state, and the temperature in the closed battery accommodating box 10 is cooled and adjusted through the cooling and fire extinguishing system 30, so that the lithium battery 20 is prevented from being too high in temperature.
In the event of a fire in the event of a failure of the lithium battery 20 or in the event of a lack of open flame but with a potential fire risk, the electrical energy storage system 100 of the new energy vehicle switches to an emergency fire extinguishing state. Specifically, it is first determined that the temperature detected by the temperature detector 39 is greater than a preset temperature threshold, and when the temperature is greater than the preset temperature threshold, there is a high risk of fire, and the emergency fire extinguishing state is entered. If the temperature detected by the temperature detector 39 is not higher than the preset temperature threshold, it is further determined that the difference between the flow rate of the battery box exhaust flow meter 361 and the flow rate of the battery box intake flow meter 351 is larger than the preset flow rate threshold, and if the difference is larger than the preset flow rate threshold, it indicates that the flow rate of the battery box exhaust flow meter 361 is far larger than the flow rate of the battery box intake flow meter 351 due to the fact that a large amount of gas is released due to a fault of the lithium battery 20, and at this time, a high fire risk exists, and the emergency fire extinguishing state is entered. If the flow rate of the battery box exhaust flow meter 361 is not larger than the flow rate of the battery box intake flow meter 351, the detection is finished. If the flow rate of the battery box exhaust flow meter 361 is greater than the flow rate of the battery box intake flow meter 351 but does not reach the difference value of the preset flow rate threshold value, the risk is judged through calculating time. Specifically, whether the time that the flow rate of the battery box exhaust flow meter 361 is larger than the flow rate of the battery box intake flow meter 351 is preset or not is calculated, if yes, the fire risk is judged to exist, and the emergency fire extinguishing state is entered. This situation shows that there is certain trouble in lithium cell 20, begins to release gas slowly, and is not violent yet to the condition that the naked light appears, but has the conflagration risk equally, starts emergency fire extinguishing at this moment and can participate in the reduction risk of putting out a fire promptly at the initial stage of the conflagration. If the time that the flow of the battery box exhaust flow meter 361 is larger than the flow of the battery box intake flow meter 351 does not reach the preset time, the gas flow and the error of the flow meter are judged, and no fire risk exists. After completing one round of detection, the next round of detection can be started, and the fire risk can be found in time through continuous circulating detection.
After entering the emergency fire extinguishing state, the blowing device 34 is closed to stop blowing. While closing the battery box intake solenoid valve 352 and the battery box exhaust solenoid valve 362 blocks the supply of air into the closed battery accommodating box 10 through the path of normal cooling operation and the output of flame or fire smoke to the outside through the path.
The medium tank air-in solenoid valve 371, the fire-extinguishing solenoid valve 331 and the medium tank air-out solenoid valve 381 are opened, and the carbon dioxide fire-extinguishing device 32 blows out carbon dioxide into the closed battery housing box 10 via the fire-extinguishing piping 33. The enclosed battery container 10 is filled with carbon dioxide to expel air, and expansion of fire is avoided by isolating oxygen. The gas inside the closed battery-accommodating case 10 is discharged into the cryogenic fluid 311 via the medium-case inlet line 37, and then discharged from the medium-case outlet line 38 through the air chamber 312. Due to the sudden fire, the fire smoke can be output into the cryogenic fluid 311, the cryogenic fluid 311 is used for reducing the temperature and extinguishing the fire, so that the flame is prevented from being directly discharged, the flame is extinguished in the system, and the other parts of the vehicle are prevented from being damaged.
As a specific embodiment, a battery box intake duct 35 communicates to the top of the closed battery accommodating box 10. After the temperature is lowered by the low-temperature fluid 311, the temperature of the air input into the closed battery housing box 10 is relatively low, the density of hot air is relatively low, and the density of cold air is relatively high, so that the heat exchange can be accelerated by inputting cold air from above, and the cooling efficiency can be improved.
As a specific embodiment, the battery box vent line 36 communicates to the bottom of the closed battery housing box 10 on the side away from the battery box inlet line 35. The battery box exhaust pipeline 36 and the battery box air inlet pipeline 35 are arranged at positions, so that the lithium battery 20 can be well cooled.
As a specific embodiment, a fire extinguishing line 33 communicates to the top of the closed battery housing box 10. Specifically, a plurality of branch lines 332 may be provided at the end of the fire extinguishing line 33. The branch line 332 is provided with a plurality of nozzles, and by providing the branch line 332, carbon dioxide can be sprayed downward over the entire top of the closed battery housing box 10, which has a good fire extinguishing effect. Alternatively, the carbon dioxide may be directly supplied into the closed battery housing box 10 through the nozzle of the fire extinguishing line 33 without providing a branch line.
As a specific embodiment, the medium tank inlet line 37 communicates to the side of the closed battery housing box 10 remote from the fire extinguishing line 33.
As a specific embodiment, in the direction of air flow within the battery compartment inlet line 35, the battery compartment inlet flow meter 351 is located upstream of the battery compartment inlet solenoid valve 352 and the battery compartment inlet check valve 353 is located downstream of the battery compartment inlet solenoid valve 352.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (9)
1. An electric energy storage system of a new energy vehicle, characterized by comprising: the device comprises a closed battery accommodating box, a lithium battery and a cooling and fire extinguishing system for cooling and extinguishing the lithium battery; the lithium battery is arranged in the closed battery accommodating box; the cooling and fire extinguishing system comprises: the low-temperature fire extinguishing system comprises a low-temperature medium containing box containing low-temperature fluid, a carbon dioxide fire extinguishing device for spraying carbon dioxide into the closed battery containing box to extinguish fire, a fire extinguishing pipeline, a fire extinguishing electromagnetic valve, a blowing device for blowing air into the closed battery containing box to cool the lithium battery, a battery box air inlet pipeline, a battery box air inlet flow meter, a battery box air inlet electromagnetic valve, a battery box air inlet one-way valve, a battery box exhaust pipeline, a battery box exhaust flow meter, a battery box exhaust electromagnetic valve, a medium box air inlet pipeline, a medium box air inlet electromagnetic valve, a medium box air outlet pipeline and a medium box air outlet electromagnetic valve; the bottom of the low-temperature medium containing box contains low-temperature fluid; the top of the low-temperature medium accommodating box forms an air cavity;
the fire extinguishing pipeline is communicated with the carbon dioxide fire extinguishing device and the closed battery accommodating box; the fire extinguishing electromagnetic valve is arranged on the fire extinguishing pipeline;
the battery box air inlet pipeline is communicated with the closed battery accommodating box and the blowing device; the battery box air inlet flow meter, the battery box air inlet electromagnetic valve and the battery box air inlet one-way valve are arranged on the battery box air inlet pipeline;
the battery box air inlet pipeline penetrates through the low-temperature medium accommodating box, part of the battery box air inlet pipeline is immersed into the low-temperature fluid, and the low-temperature fluid is used for cooling;
the battery box exhaust pipeline is communicated with the external atmosphere and the closed battery accommodating box; the battery box exhaust flowmeter and the battery box exhaust electromagnetic valve are arranged on the battery box exhaust pipeline;
the medium box air inlet pipeline is communicated with the closed battery accommodating box and the bottom of the low-temperature medium accommodating box; the medium box air inlet electromagnetic valve is arranged on the medium box air inlet pipeline;
the medium box air outlet pipeline is communicated with the external atmosphere and the air cavity at the top of the low-temperature medium accommodating box; the medium box air outlet electromagnetic valve is arranged on the medium box air outlet pipeline;
the electric energy storage system of the new energy vehicle has a working cooling state and an emergency fire extinguishing state;
when the working cooling state is achieved, the medium box air inlet electromagnetic valve and the fire extinguishing electromagnetic valve are in a closed state, the battery box air inlet electromagnetic valve and the battery box exhaust electromagnetic valve are in an open state, the blowing device drives air to enter the closed battery accommodating box through the battery box air inlet pipeline and to be exhausted through the battery box exhaust pipeline, and air in the battery box air inlet pipeline enters the closed battery accommodating box after being cooled through the low-temperature medium accommodating box;
when the emergency fire extinguishing state is realized, the blowing device is closed, the battery box air inlet electromagnetic valve and the battery box exhaust electromagnetic valve are closed, the medium box air inlet electromagnetic valve, the fire extinguishing electromagnetic valve and the medium box air outlet electromagnetic valve are in an open state, carbon dioxide blown out by the carbon dioxide fire extinguishing device enters the closed battery accommodating box through the fire extinguishing pipeline, gas in the closed battery accommodating box is discharged into the low-temperature fluid through the medium box air inlet pipeline and then passes through the air cavity to be discharged out of the medium box air outlet pipeline;
the low-temperature fluid contained in the low-temperature medium containing box is water.
2. The electric energy storage system of the new energy vehicle according to claim 1,
when the time that the flow of the battery box exhaust flowmeter is larger than the flow of the battery box inlet flowmeter reaches the preset time, the electric energy storage system of the new energy vehicle enters the emergency fire extinguishing state from the working cooling state.
3. The electric energy storage system of the new energy vehicle according to claim 1,
when the difference between the flow of the battery box exhaust flowmeter and the flow of the battery box intake flowmeter is larger than a preset flow threshold value, the electric energy storage system of the new energy vehicle enters the emergency fire extinguishing state from the working cooling state.
4. The electric energy storage system of the new energy vehicle according to claim 1,
the electric energy storage system of the new energy vehicle further includes a temperature detector for detecting a temperature in the closed battery housing box; the temperature detector is arranged in the closed battery accommodating box; when the temperature detected by the temperature detector is greater than a preset temperature threshold value, the electric energy storage system of the new energy vehicle enters the emergency fire extinguishing state from the working cooling state.
5. The electric energy storage system of the new energy vehicle according to claim 1,
and the battery box air inlet pipeline is communicated to the top of the closed battery accommodating box.
6. The electric energy storage system of the new energy vehicle according to claim 5,
the battery box exhaust pipeline is communicated to the bottom of one side, away from the battery box air inlet pipeline, of the closed battery accommodating box.
7. The electric energy storage system of the new energy vehicle according to claim 1,
the fire extinguishing pipeline is communicated to the top of the closed battery accommodating box.
8. The electric energy storage system of the new energy vehicle according to claim 7,
and the medium box air inlet pipeline is communicated to one side of the closed battery accommodating box, which is far away from the fire extinguishing pipeline.
9. The electric energy storage system of the new energy vehicle according to claim 1,
in the air flow direction in the battery box air inlet pipeline, the battery box air inlet flow meter is positioned at the upstream of the battery box air inlet electromagnetic valve, and the battery box air inlet one-way valve is positioned at the downstream of the battery box air inlet electromagnetic valve.
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