CN114872563B - Nitrogen protection system of power battery - Google Patents
Nitrogen protection system of power battery Download PDFInfo
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- CN114872563B CN114872563B CN202110763373.4A CN202110763373A CN114872563B CN 114872563 B CN114872563 B CN 114872563B CN 202110763373 A CN202110763373 A CN 202110763373A CN 114872563 B CN114872563 B CN 114872563B
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- Prior art keywords
- nitrogen
- oxygen
- battery box
- pressure
- protection system
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 513
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 248
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000001301 oxygen Substances 0.000 claims abstract description 127
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 127
- 239000007789 gas Substances 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- 238000004378 air conditioning Methods 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 238000004880 explosion Methods 0.000 abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 17
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- IYRWEQXVUNLMAY-UHFFFAOYSA-N carbonyl fluoride Chemical compound FC(F)=O IYRWEQXVUNLMAY-UHFFFAOYSA-N 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- UKACHOXRXFQJFN-UHFFFAOYSA-N heptafluoropropane Chemical compound FC(F)C(F)(F)C(F)(F)F UKACHOXRXFQJFN-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
-
- 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
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a power battery nitrogen protection system, which comprises an air compressor or an air pump for generating high-pressure air, and further comprises a nitrogen making module connected with the air compressor or the air pump, wherein the nitrogen making module comprises a nitrogen making device for separating nitrogen and oxygen of the high-pressure air, the nitrogen making device is provided with a nitrogen outlet and an oxygen outlet, the power battery nitrogen protection system further comprises a battery box, a power battery is arranged in the battery box, and a nitrogen pipeline is connected between the battery box and the nitrogen outlet; the oxygen outlet is provided with an oxygen pipeline for supplying oxygen to the passenger area. Nitrogen enters the battery box, and the oxygen concentration in the battery box is controlled in a range far away from combustion and explosion, so that accidents such as combustion and explosion are prevented. Oxygen enters the passenger area, so that the oxygen concentration of the passenger area is improved, and the comfort of passengers is improved.
Description
Technical Field
The invention relates to a nitrogen protection system of a power battery.
Background
With the large-scale application of the lithium battery system in new energy automobiles, new energy automobile ignition and combustion accidents frequently occur in recent years, and the safety of the battery serving as a core component of the new energy automobile is increasingly important. The battery safety protection problem is increasingly remarkable, and when the power battery is under the extreme working conditions such as abuse or accident, the problems such as electrolyte leakage, ignition and arc discharge can occur.
The lithium iron phosphate battery does not generate oxygen after thermal runaway, but generates combustible gases such as hydrogen, carbon monoxide, alkanes, hydrocarbons, benzene and the like, if the mixing proportion of the combustible gases and the oxygen in the battery box reaches a certain limit value, and meanwhile, the battery generates partial arc-shaped electric spark, combustion or explosion can be formed, and further safety accidents are generated.
Disclosure of Invention
The invention aims to provide a nitrogen protection system for a power battery, which solves the technical problem that the battery is easy to burn or explode after thermal runaway to generate safety accidents in the prior art.
In order to achieve the above purpose, the technical scheme of the nitrogen protection system of the power battery provided by the invention is as follows: a power cell nitrogen protection system comprising:
the air compressor or the inflating pump is used for generating high-pressure air;
the nitrogen making module is connected with the air compressor or the inflating pump and comprises a nitrogen making device for separating nitrogen and oxygen of high-pressure air, wherein the nitrogen making device is provided with a nitrogen outlet and an oxygen outlet;
the battery box is internally provided with a power battery, and a nitrogen pipeline is connected between the battery box and the nitrogen outlet;
the oxygen outlet is provided with an oxygen pipeline for supplying oxygen to the passenger area.
The beneficial effects are that: the high-concentration nitrogen generated by the nitrogen generating device enters the battery box, the oxygen concentration in the battery box is controlled in a range far away from combustion and explosion, and even if the power battery in the battery box is out of control, accidents such as combustion and explosion can be prevented, and safety accidents are prevented. And the high-concentration oxygen generated by the nitrogen making device enters the passenger area, so that the oxygen concentration of the passenger area is improved, and the comfort of passengers is improved. According to the invention, the safety performance and the comfort of passengers can be improved simultaneously through the nitrogen making device, and the waste of nitrogen and oxygen is avoided.
Preferably, the nitrogen making module comprises a decompression structure arranged on the nitrogen pipeline, and the decompression structure is used for reducing the pressure of high-pressure nitrogen. The pressure of nitrogen can be reduced through the decompression structure, the pressure of nitrogen is reduced to the range that the battery box can bear, and the influence on the shell of the battery box and the power battery is avoided.
Preferably, the nitrogen making module further comprises a nitrogen sensor module, wherein the nitrogen sensor module comprises a sensor for detecting the pressure, concentration, humidity and temperature of the nitrogen passing through the pressure reducing structure;
the nitrogen making module further comprises a nitrogen valve structure arranged on the nitrogen pipeline and a nitrogen controller for collecting detection signals of the nitrogen sensor module;
when each parameter detected by the nitrogen sensor module is smaller than a set value, the nitrogen controller controls the nitrogen valve structure to charge nitrogen into the battery box; and when any parameter detected by the nitrogen sensor module is larger than a set value, the nitrogen controller controls the nitrogen valve structure to empty nitrogen in the nitrogen pipeline. Through gathering each parameter of nitrogen gas in the nitrogen gas pipeline, can control the state of nitrogen gas valve structure, avoid appearing the condition emergence that the nitrogen gas that does not meet the requirements enters into the battery box.
Preferably, the nitrogen production module further comprises a heating device for heating the nitrogen production device and/or the high-pressure gas entering the nitrogen production device, and the heating device is used for adjusting when the nitrogen sensor module detects that the temperature in the nitrogen pipeline is higher than a set value. The heating device ensures that the nitrogen-oxygen separation can be smoothly carried out on the nitrogen-making module, and the temperature in the nitrogen pipeline can be adjusted and reduced when the temperature is too high.
Preferably, the nitrogen making module further comprises a battery box sensor module, wherein the battery box sensor module comprises a battery box pressure sensor for detecting the pressure in the battery box;
the nitrogen making module further comprises a total control valve positioned between the air compressor or the air pump and the nitrogen making device, and the total control valve is used for being closed when the battery box sensor module detects that the pressure of the battery box is larger than a set value. When the pressure in the battery box is larger than the set value, the nitrogen amount in the battery box meets the use requirement, and at the moment, the total control valve is closed to prevent nitrogen from entering the nitrogen production device.
Preferably, the power battery nitrogen protection system further comprises a fire extinguishing device, wherein the fire extinguishing device is connected to the nitrogen pipeline, so that the fire extinguishing device can introduce fire extinguishing gas into the battery box through the nitrogen pipeline. Connect extinguishing device on nitrogen gas pipeline, can make nitrogen gas and fire extinguishing gas mix, put out a fire to the battery box together, connect extinguishing device on nitrogen gas pipeline moreover, need not connect extinguishing device at the battery box in addition reopening.
Preferably, the power cell nitrogen protection system further comprises a filtering structure arranged at the upstream of the nitrogen making device so as to filter the gas entering the nitrogen making device.
Preferably, the oxygen pipeline is used for being connected to an air outlet of an air conditioner of the air conditioning system. The oxygen pipeline is connected to the air outlet of the air conditioner, and the oxygen pipeline is not required to be connected to the opening of the vehicle, so that the structure is simple.
Preferably, the power cell nitrogen protection system comprises an oxygen control system comprising an oxygen concentration sensor for detecting the oxygen concentration of the passenger area;
the oxygen control system also comprises an oxygen valve structure arranged on the oxygen pipe and an oxygen controller for acquiring the detection signal of the oxygen concentration sensor;
when the oxygen concentration of the passenger area is smaller than a set value, the oxygen controller controls the oxygen valve structure to introduce oxygen into the passenger area; and when the oxygen concentration of the passenger area is greater than a set value, the oxygen controller controls the oxygen valve structure to empty oxygen in the oxygen pipeline. When the oxygen concentration of the passenger area is higher than the set value, the oxygen can be emptied, and the influence of the too high oxygen concentration of the passenger area on the passenger feeling is avoided.
Preferably, the power battery nitrogen protection system comprises a high-pressure gas storage cylinder positioned between the air compressor or the air pump and the nitrogen making module, and at least two air outlets connected with the nitrogen making module and the braking device are arranged on the high-pressure gas storage cylinder. The braking system and the power battery nitrogen protection system share an air compressor or an air pump, and the air compressor or the air pump does not need to be additionally arranged, so that the cost can be saved, and the occupied area is small.
Drawings
FIG. 1 is a schematic diagram of an embodiment 1 of a nitrogen protection system for a power cell according to the present invention;
FIG. 2 is a schematic diagram of the nitrogen module of FIG. 1;
FIG. 3 is a schematic diagram of a nitrogen module in an embodiment 1 of a nitrogen protection system for a power battery according to the present invention;
FIG. 4 is a flow chart of the nitrogen protection of the power battery in example 1 of the nitrogen protection system of the power battery provided by the invention;
FIG. 5 is a schematic diagram of the oxygen control system of FIG. 1;
FIG. 6 is a flow chart of the oxygen control system in example 1 of the nitrogen protection system for power cells according to the present invention;
FIG. 7 is a schematic diagram of an embodiment 7 of a nitrogen protection system for a power cell according to the present invention;
reference numerals illustrate:
100. a nitrogen portion; 101. a primary filter; 102. an air compressor; 103. a condenser; 104. a dryer; 105. a high pressure gas reservoir; 106. a secondary filter; 107. a third stage filter; 108. a nitrogen making module; 109. a battery box; 110. a first electromagnetic valve; 111. a pressure reducing structure; 112. a heating device; 113. a nitrogen reservoir; 114. a third electromagnetic valve; 115. a second electromagnetic valve; 116. a nitrogen controller; 117. a vehicle controller; 118. a fire extinguishing device; 119. a nitrogen making device; 200. an oxygen portion; 201. an oxygen control system; 202. an air conditioning system; 203. a passenger zone; 204. a fourth electromagnetic valve; 205. a fifth electromagnetic valve; 206. an oxygen controller; 207. an oxygen concentration sensor.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" is not intended to exclude processes, methods comprising such element.
In the description of the present invention, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "provided" may be interpreted broadly, and for example, an object "provided" may be a part of a body, may be separately disposed from the body, and may be connected to the body, where the connection may be a detachable connection or an undetachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
The present invention is described in further detail below with reference to examples.
The invention provides a specific embodiment 1 of a nitrogen protection system of a power battery, which comprises the following steps:
as shown in fig. 1 to 6, the power battery nitrogen protection system includes a nitrogen portion 100 and an oxygen portion 200, wherein the nitrogen portion 100 is used for charging nitrogen into the battery box 109, so that the positive pressure environment is maintained in the battery box 109, the oxygen concentration in the battery box is reduced, and even if the power battery in the battery box is out of control, the combustion and explosion conditions are avoided. The oxygen part 200 can supply oxygen to the passenger area 203, increase the oxygen concentration of the passenger area 203, and improve the comfort of passengers.
The nitrogen portion 100 includes a primary filter 101, an air compressor 102, a condenser 103, a dryer 104, a high-pressure gas cylinder 105, a secondary filter 106, a tertiary filter 107, a nitrogen making module 108, and a battery box 109, which are sequentially arranged in the flow direction of the gas, wherein the primary filter 101, the air compressor 102, the condenser 103, the dryer 104, and the high-pressure gas cylinder 105 are structures of a brake system built in a vehicle. Air is filtered by a filter 101 and then compressed by an air compressor 102, the moisture of high-pressure gas is converted into liquid by a condenser 103, the gas is dried by a dryer 104 after filtering the moisture, the dried high-pressure gas is stored in a high-pressure gas storage cylinder 105, and a nitrogen making module 108 takes gas from the high-pressure gas storage cylinder 105. The nitrogen making module 108 of the embodiment includes a nitrogen making device 119, the nitrogen making device 119 is a membrane separation section in the membrane separation nitrogen making module, air is separated into high-concentration nitrogen and high-concentration oxygen, and the size of the nitrogen making device 119 based on the separation membrane principle is smaller, so that the nitrogen making module is suitable for vehicle-mounted use. The nitrogen making device 119 has a nitrogen outlet and an oxygen outlet, wherein the nitrogen outlet is connected with a nitrogen pipeline, and the nitrogen pipeline is connected to the battery box 109, so that the separated nitrogen can be filled into the battery box.
In order to control the on-off of nitrogen pipeline according to actual need to and guarantee that the nitrogen gas that lets in the battery box 109 satisfies the user demand, nitrogen making module 108 includes pressure reducing structure 111, pressure reducing structure 111's effect is in order to control the nitrogen gas pressure that lets in the battery box 109 and stabilize in the within range that can bear of power battery, pressure reducing structure 111 arranges on the nitrogen pipeline, pressure reducing structure 111 includes relief pressure valve and the flow control valve that arranges in proper order, the relief pressure valve can reduce high-pressure compressed gas to low-pressure gas, and the flow control valve can adjust the overflow aperture according to the pressure of upper reaches, and then control low-stream pressure stabilizes to required pressure. When the flow control valve is used, the flow control valve in the prior art is selected, and the downstream pressure is controlled by changing the size of the overflow hole.
In this embodiment, the battery box 109 has an air inlet, which can be connected to a nitrogen line, and a waterproof structure is provided at the air inlet during specific use. The nitrogen making module 108 includes a battery box sensor module composed of a plurality of sensors, and is capable of detecting parameters such as pressure, temperature, humidity, oxygen concentration, etc. in the battery box 109. The purpose of detecting the oxygen concentration in the battery box is that the sensor for detecting the oxygen concentration in the prior art is mature, the ratio of oxygen to nitrogen in gas is a fixed value, and the oxygen concentration can be converted into the nitrogen concentration after the oxygen concentration is detected. In other embodiments, the nitrogen concentration may be detected directly with a nitrogen concentration sensor. During normal use, the battery box 109 is filled with nitrogen, and the pressure in the battery box 109 is kept at a constant value, but during actual use, the nitrogen in the battery box 109 can permeate outwards, so that the pressure in the battery box 109 is reduced. In actual use, whether or not nitrogen needs to be introduced into the battery box 109 is determined according to whether or not the pressure of the battery box 109 is smaller than a set value.
Wherein, when the pressure in the battery box 109 is detected, a differential pressure method is adopted for calculation, a first pressure sensor is arranged in the battery box 109, a communication port communicated with the atmosphere is arranged on the nitrogen making module 108, a second pressure sensor is arranged at the communication port, and the pressure in the battery box 109 is the difference between the values of the first pressure sensor and the second pressure sensor. In other embodiments, a pressure sensor is mounted on the housing of the battery box, and the pressure sensor penetrates through the housing of the battery box and is communicated with the inner cavity of the battery box, and the value read at this time is directly the pressure of the battery box.
The nitrogen introduced into the battery box 109 needs to meet the requirements of various parameters such as pressure, concentration, humidity, temperature and the like, wherein the humidity of the nitrogen in the nitrogen pipeline can be reduced through the condenser 103 and the dryer 104, and the pressure of the gas in the nitrogen pipeline can be reduced through the pressure reducing structure 111. To ensure that the temperature of the nitrogen gas meets the operating requirements, and to prevent the nitrogen making module 108 from being incapable of making nitrogen at low temperatures, the nitrogen making module 108 further comprises a heating device 112, wherein the heating device 112 is arranged upstream of the nitrogen making device 119 and is used for heating the gas entering the nitrogen making device 119, and of course, in other embodiments, the nitrogen making device itself can be directly heated, or the nitrogen making device and the gas can be heated simultaneously. The heating mode can adopt resistance wires for electric heating, and hot air or hot oil can also be used for heat exchange heating.
In order to prevent particles, impurities and the like in the air from blocking or damaging a separation membrane in the nitrogen making device 119, the nitrogen part comprises a filtering structure, the filtering structure is positioned at the upstream of the nitrogen making device 119, the filtering structure comprises a primary filter 101, a secondary filter 106 and a tertiary filter 107, the primary filter 101 is positioned at the upstream of the air compressor 102 and is an air filter of a vehicle, oil stains and dust in the air are mainly filtered, the control precision is more than 3um, the secondary filter 106 filters large particle dust in the air, the control precision is more than 1um, and the tertiary filter 107 filters small particle dust in the air, and the control precision is more than 0.01 um. The external view of the nitrogen making module 108 is shown in fig. 3, the nitrogen making module 108 includes an external housing, other structures are all located in the housing, and when actually arranged, the secondary filter 106 and the tertiary filter 107 can be arranged according to the space of the whole vehicle, and the secondary filter 106 and the tertiary filter 107 can be arranged in the housing of the nitrogen making module 108 or can be separately and externally arranged.
As shown in fig. 2, the nitrogen making module 108 further includes a first electromagnetic valve 110 located between the high-pressure gas storage cylinder 105 and the nitrogen making device 119, and the first electromagnetic valve 110 controls whether the high-pressure gas in the high-pressure gas storage cylinder 105 is introduced into the nitrogen making device 119, and the heating device 112 is located between the first electromagnetic valve 110 and the nitrogen making device 119. A nitrogen gas reservoir 113 is arranged on the nitrogen gas line, a pressure reducing structure 111 is located downstream of the nitrogen gas reservoir 113, and a second electromagnetic valve 115 and a third electromagnetic valve 114 are connected in parallel downstream of the pressure reducing structure 111. The second electromagnetic valve 115 is a nitrogen evacuation valve, the third electromagnetic valve 114 is a nitrogen on-off valve, and when the nitrogen in the nitrogen pipeline does not meet the requirement, the second electromagnetic valve 115 is opened, the third electromagnetic valve 114 is closed, and the nitrogen in the nitrogen pipeline is evacuated. When the nitrogen in the nitrogen line meets the requirement, the second electromagnetic valve 115 is closed, and the third electromagnetic valve 114 is opened, so that the nitrogen in the nitrogen line is introduced into the battery box 109. When in use, the pressure in the battery box 109 is collected before the nitrogen making device 119 is opened, if the pressure value is smaller than the set value, the first electromagnetic valve 110 is opened, so that high-pressure gas enters the nitrogen making device 119, if the pressure value is larger than the set value, the first electromagnetic valve 110 is closed, and the nitrogen making device 119 cannot make nitrogen by taking gas from the high-pressure gas storage cylinder 105.
In this embodiment, in order to realize the control of the second electromagnetic valve 115 and the third electromagnetic valve 114, the nitrogen making module 108 includes, in addition to the above-mentioned battery box sensor module, a nitrogen sensor module for detecting the pressure, oxygen concentration, humidity and temperature of the nitrogen gas located downstream of the pressure reducing structure 111 in the nitrogen gas pipeline (the principle of detecting the oxygen concentration is the same as that described above and will not be described here again), and the nitrogen making module 108 further includes a nitrogen controller 116, where the nitrogen controller 116 can collect data of the nitrogen sensor module, and determine and control the states of the second electromagnetic valve 115 and the third electromagnetic valve 114 according to the data. The nitrogen controller 116 can feed back the collected pressure value of the nitrogen to the pressure reducing structure 111 for adjustment; the temperature value of the collected nitrogen gas can be fed back to the heating device 112, and the temperature of the heating device 112 can be reduced. The nitrogen controller 116 may control the opening of the second electromagnetic valve 115 and the third electromagnetic valve 114, and may collect the pressure value in the battery box 109, so as to control the opening and closing of the first electromagnetic valve 110. In other embodiments, a controller may be separately provided for opening and closing the first solenoid valve.
The flow of the nitrogen portion 100 in use is shown in fig. 4, wherein the solid line in fig. 4 is a gas path, and the dotted line is a control line.
Oxygen section 200 as shown in fig. 5, oxygen section 200 includes an oxygen line connected to the oxygen outlet of nitrogen making apparatus 119. To control the on-off of the oxygen line, the oxygen section 200 is further provided with an oxygen control system 201, the oxygen control system 201 comprising an oxygen concentration sensor 207, the oxygen concentration sensor 207 being capable of detecting the oxygen concentration of the passenger area 203. A fourth electromagnetic valve 204 and a fifth electromagnetic valve 205 are arranged in parallel on the oxygen pipeline, wherein the fourth electromagnetic valve 204 is connected to the air conditioning system 202 of the vehicle, and is specifically connected to an air outlet of the air conditioning system 202; the fifth solenoid valve 205 is an oxygen evacuation valve for evacuating oxygen in the oxygen line to the outside of the vehicle, and the fourth solenoid valve 204 is an oxygen on-off valve. The oxygen control system 201 further comprises an oxygen controller, the oxygen controller can collect the detection value of the oxygen concentration sensor 207, and if the oxygen concentration is greater than the set value, the oxygen controller controls the fifth electromagnetic valve 205 to open and the fourth electromagnetic valve 204 to close, so that the oxygen in the oxygen pipeline is discharged out of the vehicle; if the oxygen concentration is less than the set value, the oxygen controller controls the fifth electromagnetic valve 205 to be closed and the fourth electromagnetic valve 204 to be opened, and oxygen is introduced into the passenger area 203 through the air conditioning system 202, so that the oxygen concentration is controlled within a comfortable range of human body, especially in a region with low plateau oxygen, and passengers on the vehicle feel comfortable like a forest oxygen bar while improving the safety. The flow of the oxygen control system 201 is shown in fig. 6, where the solid line represents the gas path and the dotted line represents the control line.
In this embodiment, the nitrogen evacuation valve and the nitrogen on-off valve form a nitrogen valve structure, and the oxygen evacuation valve and the oxygen on-off valve form an oxygen valve structure. The first solenoid valve constitutes the master valve.
In this embodiment, the power battery nitrogen protection system and the vehicle braking system share the primary filter 101, the air compressor 102, the condenser 103, the dryer 104 and the high-pressure gas storage cylinder 105, specifically, at least two air outlets are formed on the high-pressure gas storage cylinder 105, one air outlet is connected with the nitrogen making module 108, and the other air outlet is connected with the braking device of the vehicle braking system.
Specific example 2 of the nitrogen protection system for a power battery of the invention:
the difference from embodiment 1 is that in embodiment 1, the air compressor is used to generate the high-pressure gas, and in this embodiment, the inflating pump is used to generate the high-pressure gas.
Specific example 3 of the nitrogen protection system for a power battery of the present invention:
the difference from embodiment 1 is that in embodiment 1, the brake system of the vehicle and the nitrogen protection system of the power battery share the air compressor, and in this embodiment, the nitrogen protection system of the power battery is separately equipped with the air compressor, and the condenser, the dryer, and the like downstream of the air compressor.
Specific example 4 of the nitrogen protection system for power cells of the present invention:
unlike embodiment 1, in embodiment 1, the oxygen valve structure includes an oxygen evacuation valve and an oxygen on-off valve. In this embodiment, the oxygen valve structure is a three-way valve, and the oxygen direction is changed by switching the state of the three-way valve.
Specific example 5 of the nitrogen protection system for power cells of the present invention:
the difference from embodiment 1 is that in embodiment 1, an oxygen pipe is connected to an air outlet of an air conditioning system. In this embodiment, an additional opening is provided in the vehicle to connect the oxygen line.
Specific example 6 of the nitrogen protection system for a power battery of the invention:
the difference from example 1 is that in example 1, the filtration structure has three stages of filtration. In this embodiment, the number of stages and arrangement of the filter structures may be changed.
Specific example 7 of the nitrogen protection system for a power battery of the present invention:
as shown in fig. 7, in the present embodiment, a fire extinguishing device 118 is connected between the nitrogen making module 108 and the battery box 109, specifically, the fire extinguishing device 118 is connected to a nitrogen gas line between the nitrogen making device and the battery box 109, and the fire extinguishing gas of the fire extinguishing device 118 is heptafluoropropane, perfluoroketone, or the like, which is different from embodiment 1. When a fire or the like occurs in the battery box 109, the whole vehicle controller 117 controls the fire extinguishing device 118 to spray fire extinguishing gas, and the fire extinguishing gas enters the battery box 109.
Specific example 8 of the nitrogen protection system for a power battery of the invention:
the difference from embodiment 1 is that in embodiment 1, there is a total control valve between the air compressor and the nitrogen making device, and the total control valve is closed when the pressure in the battery box is greater than the set value. In this embodiment, the master control valve is omitted, and when the pressure in the battery box is greater than the set value, the nitrogen valve structure only discharges the nitrogen in the nitrogen pipeline.
Specific example 9 of the nitrogen protection system for power cells of the present invention:
the difference from embodiment 1 is that in embodiment 1, the nitrogen purge valve and the nitrogen on-off valve form a nitrogen valve structure. In this embodiment, the nitrogen valve structure is a three-way valve, and the trend of nitrogen is changed by switching the state of the three-way valve.
It should be noted that the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, but may be modified without inventive effort or equivalent substitution of some technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A power battery nitrogen protection system is characterized in that: comprising the following steps:
an air compressor (102) or an air pump for generating high-pressure air;
the nitrogen making module (108) is connected with the air compressor (102) or the inflating pump and comprises a nitrogen making device (119) for separating nitrogen and oxygen of high-pressure air, wherein the nitrogen making device (119) is provided with a nitrogen outlet and an oxygen outlet; the nitrogen making module (108) further comprises a heating device (112) for heating the nitrogen making device (119) and/or high-pressure gas entering the nitrogen making device (119), wherein the heating device (112) is used for adjusting when the nitrogen sensor module detects that the temperature in the nitrogen pipeline is higher than a set value; the nitrogen making module (108) comprises a decompression structure (111) which is arranged on the nitrogen pipeline and positioned at the downstream of the nitrogen making device, and the decompression structure (111) is used for reducing the pressure of high-pressure nitrogen;
the battery box (109) is internally provided with a power battery, and a nitrogen pipeline is connected between the battery box (109) and the nitrogen outlet;
the oxygen outlet is provided with an oxygen pipeline for supplying oxygen to the passenger area (203).
2. The power cell nitrogen protection system of claim 1, wherein: the nitrogen making module (108) further comprises a nitrogen sensor module, wherein the nitrogen sensor module comprises a sensor for detecting the pressure, concentration, humidity and temperature of the nitrogen passing through the pressure reducing structure (111);
the nitrogen making module (108) also comprises a nitrogen valve structure arranged on the nitrogen pipeline and a nitrogen controller (116) for collecting detection signals of the nitrogen sensor module;
when each parameter detected by the nitrogen sensor module is smaller than a set value, the nitrogen controller (116) controls the nitrogen valve structure to charge nitrogen into the battery box (109); and when any parameter detected by the nitrogen sensor module is larger than a set value, the nitrogen controller (116) controls the nitrogen valve structure to empty nitrogen in the nitrogen pipeline.
3. The power cell nitrogen protection system of claim 2, wherein: the nitrogen making module (108) further comprises a battery box sensor module, wherein the battery box sensor module comprises a battery box pressure sensor for detecting the pressure in the battery box (109);
the nitrogen making module (108) further comprises a total control valve arranged between the air compressor (102) or the air pump and the nitrogen making device (119), wherein the total control valve is used for being closed when the battery box sensor module detects that the pressure of the battery box (109) is larger than a set value.
4. A power cell nitrogen protection system according to any one of claims 1-3, wherein: the power battery nitrogen protection system further comprises a fire extinguishing device (118), and the fire extinguishing device (118) is connected to the nitrogen pipeline, so that the fire extinguishing device (118) can introduce fire extinguishing gas into the battery box (109) through the nitrogen pipeline.
5. A power cell nitrogen protection system according to any one of claims 1-3, wherein: the power cell nitrogen protection system also comprises a filtering structure, wherein the filtering structure is arranged at the upstream of the nitrogen making device (119) so as to filter the gas entering the nitrogen making device (119).
6. A power cell nitrogen protection system according to any one of claims 1-3, wherein: the oxygen pipeline is used for being connected to an air outlet of an air conditioner of the air conditioning system.
7. A power cell nitrogen protection system according to any one of claims 1-3, wherein: the power cell nitrogen protection system comprises an oxygen control system (201), wherein the oxygen control system (201) comprises an oxygen concentration sensor (207) for detecting the oxygen concentration of a passenger area (203);
the oxygen control system (201) also comprises an oxygen valve structure arranged on the oxygen pipe and an oxygen controller (206) for collecting a detection signal of the oxygen concentration sensor (207);
an oxygen controller (206) controls the oxygen valve structure to introduce oxygen into the passenger area (203) when the oxygen concentration of the passenger area (203) is less than a set value; an oxygen controller (206) controls the oxygen valve structure to empty the oxygen line of oxygen when the passenger area (203) oxygen concentration is greater than a set point.
8. A power cell nitrogen protection system according to any one of claims 1-3, wherein: the power battery nitrogen protection system comprises a high-pressure gas storage cylinder (105) arranged between an air compressor (102) or an inflating pump and a nitrogen making module (108), wherein the high-pressure gas storage cylinder (105) is at least provided with two air outlets connected with the nitrogen making module (108) and a braking device.
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