CN110797594B - Electric vehicle power battery fire hazard quantitative early warning and display method - Google Patents

Electric vehicle power battery fire hazard quantitative early warning and display method Download PDF

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CN110797594B
CN110797594B CN201911081148.1A CN201911081148A CN110797594B CN 110797594 B CN110797594 B CN 110797594B CN 201911081148 A CN201911081148 A CN 201911081148A CN 110797594 B CN110797594 B CN 110797594B
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fire alarm
equal
concentration
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alarm characteristic
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CN110797594A (en
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张少禹
伊程毅
董海斌
刘连喜
李毅
盛彦锋
高云升
羡学磊
于东兴
赵青松
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Tianjin Fire Research Institute of MEM
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    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
    • 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
    • H01M10/42—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
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • 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

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Abstract

The invention provides a quantitative early warning and display method for a fire disaster of a power battery of an electric vehicle. Adopting temperature, carbon monoxide concentration, oxygen concentration, carbon dioxide concentration, hydrocarbon concentration, electrolyte characteristic substance concentration, deformation quantity, voltage, stress and pressure as fire early warning detection objects; setting a pre-warning threshold value and a corresponding fire alarm characteristic value for each detection object; weighting the fire alarm characteristic value of each detection object; adopting a fire occurrence index as a fire quantitative early warning index; setting the value to 5 early warning ranges; and the safety condition of the power battery is displayed by alarm on a running computer display screen according to different values, different colors and sound of five gears. The intelligent vehicle-mounted battery warning system has the advantages that the safety conditions of the battery in different stages are converted into prompt display with different colors through quantitative data, and after the battery generates serious potential safety hazards, the vehicle-mounted personnel are prompted to evacuate timely through color display and sound alarm, so that reliable guarantee is provided for safe escape of the personnel.

Description

Electric vehicle power battery fire hazard quantitative early warning and display method
Technical Field
The invention relates to the technical field of electric vehicle power battery fire early warning, in particular to a quantitative early warning and display method for electric vehicle power battery fire.
Background
With the continuous development of new energy technologies, a plurality of countries in the world have clearly guided the fuel vehicle sale prohibition schedule at present, so that the development of new energy automobile technologies is changing day by day, and the market share of various types of new energy automobiles (passenger cars, passenger cars and special vehicles) is continuously increased. In case of safety problems and fire hazards of the power battery of the electric vehicle, the whole vehicle fire hazard is easily caused, personal safety and property safety of personnel on the vehicle are seriously threatened, the current fire hazard early warning technology of the power battery of the electric vehicle generally adopts temperature, voltage, gas component concentration and the like as detection objects, an early warning signal can be sent only when the power battery breaks down during working, and the early warning technology capable of quantitatively displaying the fire hazard safety condition of the power battery of the electric vehicle is not available.
Disclosure of Invention
In view of the state and the defects of the prior art, the invention provides a quantitative early warning and displaying method for a fire disaster of a power battery of an electric vehicle. The method aims to adopt a quantitative fire early warning method, detect by adopting a plurality of fire early warning detection objects, and represent the fire safety of the power battery of the electric automobile by adopting a numerical value within a range of 0-100.
The technical scheme adopted by the invention is as follows: the utility model provides a quantitative early warning and display method of electric motor car power battery conflagration, includes power battery box, driving computer and the driving computer display screen of setting in the electric motor car, its characterized in that: temperature T and carbon monoxide concentration C in power battery box collected by traveling crane computerCOOxygen concentration
Figure GDA0002867331100000011
Concentration of carbon dioxide
Figure GDA0002867331100000012
Hydrocarbon concentration
Figure GDA0002867331100000013
Electrolyte characteristic concentration CelecThe deformation L, the voltage U, the stress delta and the pressure P are used as fire early warning detection objects;
setting N early warning threshold values and N +1 corresponding fire alarm characteristic values X for each detection object, wherein: n is more than or equal to 1, and X is more than or equal to 0 and less than or equal to 100;
for temperature T early warning threshold value and fire alarm characteristic value X corresponding to temperature TTIs set with the set { T }1 T2 T3… TNDenotes N early warning thresholds, in sets
Figure GDA0002867331100000014
Representing N +1 corresponding fire alarm characteristic values, wherein the detected temperature value is T, and the fire alarm characteristic value X corresponding to the temperatureTThe values are as follows:
Figure GDA0002867331100000015
wherein: t isj＜T≤Tj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for carbon monoxide concentration CCOEarly warning threshold and carbon monoxide concentration CCOCorresponding fire alarm characteristic value XCOIs set with the set { CCO1 CCO2 CCO3 … CCONDenotes N early warning thresholds, in sets
Figure GDA0002867331100000016
Representing N +1 corresponding fire alarm characteristic values, detecting the concentration of carbon monoxide as CCOFire alarm characteristic value X corresponding to carbon monoxide concentrationCOThe values are as follows:
Figure GDA0002867331100000017
wherein: cCOj＜CCO≤CCOj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for oxygen concentration
Figure GDA0002867331100000018
Early warning threshold and oxygen concentration
Figure GDA00028673311000000121
Corresponding fire alarm characteristic value
Figure GDA0002867331100000019
By sets of
Figure GDA00028673311000000110
Representing N warning thresholds, in sets
Figure GDA00028673311000000111
Representing N +1 corresponding fire alarm characteristic values, detecting the oxygen concentration as
Figure GDA00028673311000000112
Fire alarm characteristic value corresponding to oxygen concentration
Figure GDA00028673311000000113
The values are as follows:
Figure GDA00028673311000000114
wherein:
Figure GDA00028673311000000115
j is an integer;
for carbon dioxide concentration
Figure GDA00028673311000000116
Early warning threshold and carbon dioxide concentration
Figure GDA00028673311000000117
Corresponding fire alarm characteristic value
Figure GDA00028673311000000118
By sets of
Figure GDA00028673311000000119
Representing N warning thresholds, in sets
Figure GDA00028673311000000120
Representing N +1 corresponding fire alarm characteristic values, detecting the concentration of carbon dioxide as
Figure GDA0002867331100000021
Fire alarm characteristic value corresponding to carbon dioxide concentration
Figure GDA0002867331100000022
The values are as follows:
Figure GDA0002867331100000023
wherein:
Figure GDA0002867331100000024
j is an integer;
for hydrocarbon concentration
Figure GDA0002867331100000025
Early warning threshold and hydrocarbon concentration
Figure GDA0002867331100000026
Corresponding fire alarm characteristic value
Figure GDA0002867331100000027
By sets of
Figure GDA0002867331100000028
Representing N warning thresholds, in sets
Figure GDA0002867331100000029
Representing N +1 corresponding fire alarm characteristic values, detecting the concentration of hydrocarbon as
Figure GDA00028673311000000210
Fire alarm characteristic value corresponding to hydrocarbon concentration
Figure GDA00028673311000000211
The values are as follows:
Figure GDA00028673311000000212
wherein:
Figure GDA00028673311000000213
j is an integer;
characteristic concentration C for electrolyteelecEarly warning threshold and electrolyte characteristic concentration CelecCorresponding fire alarm characteristic value XelecIs set with the set { Celec1 Celec2 Celec3 … CelecNDenotes N early warning thresholds, in sets
Figure GDA00028673311000000214
Representing N +1 corresponding fire alarm characteristic values, and detecting that the concentration of the electrolyte characteristic substance is CelecAnd fire alarm characteristic value X corresponding to concentration of electrolyte characteristic substanceelecThe values are as follows:
Figure GDA00028673311000000215
wherein: celecj＜Celec≤Celecj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for the deformation L early warning threshold value and the fire alarm characteristic value X corresponding to the deformation LLIs set with the set { L }1 L2L3 … LNDenotes N early warning thresholds, in sets
Figure GDA00028673311000000216
Representing N +1 corresponding fire alarm characteristic values, detecting that the deformation quantity is L and the fire alarm characteristic value X corresponding to the deformation quantityLThe values are as follows:
Figure GDA00028673311000000217
wherein: l isj＜L≤Lj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for the fire alarm characteristic value X corresponding to the voltage U early warning threshold value and the voltage UUIs set with the set { U }1 U2 U3… UNDenotes N early warning thresholds, in sets
Figure GDA00028673311000000218
Representing N +1 corresponding fire alarm characteristic values, detecting voltage as U, and fire alarm characteristic value X corresponding to voltageUThe values are as follows:
Figure GDA00028673311000000219
wherein: u shapej＜U≤Uj+1J is not less than 1 and not more than N, j is an integer
For stress delta early warning threshold value and fire alarm characteristic value X corresponding to stress deltaδIs set by the set { δ }1 δ2 δ3… δNDenotes N early warning thresholds, in sets
Figure GDA00028673311000000220
Representing N +1 corresponding fire alarm characteristic values, detecting stress as delta, and fire alarm characteristic value X corresponding to the stressδThe values are as follows:
Figure GDA00028673311000000221
wherein: deltaj＜δ≤δj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for the pressure P early warning threshold value and the fire alarm characteristic value X corresponding to the pressure PPIs set with the set { P1 P2 P3… PNDenotes N early warning thresholds, in sets
Figure GDA00028673311000000222
Representing N +1 corresponding fire alarm characteristic values, detecting pressure as P, and fire alarm characteristic value X corresponding to the pressurePThe values are as follows:
Figure GDA00028673311000000223
wherein: pj＜P≤Pj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
assigning a weight coefficient I to the fire alarm characteristic value of each detection object, wherein I is more than or equal to 0, and the sum of all weight coefficients is 1, then:
Figure GDA00028673311000000224
wherein: i isTWeighting coefficients for the temperature fire alarm characteristic values; i isCOWeighting coefficients for the fire alarm characteristic values of the carbon monoxide concentration;
Figure GDA00028673311000000225
weighting coefficients for the oxygen concentration fire alarm characteristic values;
Figure GDA00028673311000000226
weighting coefficients for the carbon dioxide concentration fire alarm characteristic values;
Figure GDA00028673311000000227
weighting coefficients for the hydrocarbon concentration fire alarm characteristic values; i iselecWeighting coefficients for the electrolyte characteristic substance concentration fire alarm characteristic values; i isLWeighting coefficients for deformation quantity fire alarm characteristic values; i isUWeighting coefficients for the voltage fire alarm characteristic values; i isδWeighting coefficients for the stress fire alarm characteristic values; i isPWeighting coefficients for the pressure fire alarm characteristic values;
the fire occurrence index Y is used as a fire quantitative early warning index, Y is more than or equal to 0 and less than or equal to 100, and the Y is assigned as follows:
when any X is 100, Y is 100;
when any X is less than 100, the total content of the compound,
Figure GDA0002867331100000031
and set the Y value to 5 early warning ranges:
y is more than or equal to 90 and less than or equal to 100, which indicates that the power battery has a fire, and the power battery should leave the vehicle immediately and start a fire extinguishing facility;
y is more than or equal to 80 and less than 90, which indicates that the power battery is about to have a fire, and the power battery should leave the vehicle immediately and take emergency measures;
y is more than or equal to 70 and less than 80, which indicates that the power battery has certain fire hazard or sign and needs to be checked immediately;
y is more than or equal to 60 and less than 70, which indicates that the power battery has less potential safety hazard or sign and can be normally used, but the inspection needs to be paid attention to;
y is more than or equal to 0 and less than 60, which indicates that the power battery is safe and can be normally used;
according to the 5 early warning ranges set above, the safety condition of the power battery is displayed on a running computer display screen by numerical values, different colors and sound alarm, and the safety condition is mainly divided into five grades:
(1) green, Y value range is more than or equal to 0 and less than 60, and battery safety is displayed;
(2) the color is light yellow, the value range of Y is more than or equal to 60 and less than 70, and the potential safety hazard is shown, and the inspection is noticed;
(3) dark yellow, Y value range is more than or equal to 70 and less than 80, which shows that 'fire hazard exists, and immediate inspection is carried out';
(4) light red and sound alarm, Y is more than or equal to 80 and less than 90, and the display shows that 'a fire disaster is about to happen and people leave the vehicle immediately';
(5) and (4) performing sound alarm in a dark red state, wherein the Y value range is more than or equal to 90 and less than or equal to 100, and displaying that the fire disaster happens and the personnel leave the vehicle immediately.
The invention has the beneficial effects that the driving computer acquires real-time data of different parameters in the power battery box and determines the safety condition of the power battery according to the preset judgment threshold value and the logic relationship. In different stages, the safety condition of the battery is converted into prompts of different colors through quantitative data and displayed to users, serious potential safety hazards can be generated on the power battery, and before a fire disaster happens, people in the vehicle are prompted to evacuate timely through color display and sound alarm of a driving computer display screen, so that reliable guarantee is provided for safe escape of the people.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in figure 1, the quantitative early warning and display method for the fire disaster of the power battery of the electric vehicle comprises a power battery box, a traveling computer and a traveling computer display screen which are arranged in the electric vehicle, wherein the traveling computer acquires the temperature T and the carbon monoxide concentration C in the battery boxCOOxygen concentration
Figure GDA0002867331100000032
Concentration of carbon dioxide
Figure GDA0002867331100000033
Hydrocarbon concentration
Figure GDA0002867331100000034
Electrolyte characteristic concentration CelecAnd the deformation L, the voltage U, the stress delta, the pressure P data and the like are taken as fire early warning detection objects.
The invention is further illustrated by taking a power lithium battery of a certain material system as an example.
Example 1;
temperature T, set 3 alarm thresholds: {100 ℃, 150 ℃, 300 ℃ and corresponding fire alarm characteristic value set as { 407585100 };
carbon monoxide concentration CCOSetting 3 alarm thresholds: {50ppm 100ppm 300ppm }, and the corresponding fire alarm characteristic value set is { 205070100 };
oxygen concentration
Figure GDA0002867331100000035
Setting 1 alarm threshold: 15 percent, and the corresponding fire alarm characteristic value set is 60100
Concentration of carbon dioxide
Figure GDA0002867331100000036
Set 2 alarm thresholds: {100ppm 300ppm }, and the corresponding fire alarm characteristic value set is { 5070100 };
hydrocarbon concentration
Figure GDA0002867331100000041
Set 2 alarm thresholds: {150ppm 300ppm }, and the corresponding fire alarm characteristic value set is { 5070100 };
electrolyte characteristic concentration CelecSetting 2 alarm thresholds: {150ppm 300ppm }, and the corresponding fire alarm characteristic value set is { 5070100 };
the deformation L, set up 3 warning thresholds: { 5% 10% 15% }, and the corresponding fire alarm characteristic value set is { 407585100 };
voltage U, setting 2 alarm thresholds: {0V 3.7V }, wherein the corresponding fire alarm characteristic value set is { 5070100 };
stress δ, set 2 alarm thresholds: {1000N 3000N }, wherein the corresponding fire alarm characteristic value set is { 3070100 };
pressure P, setting 2 alarm thresholds: {101Kpa 180Kpa }, wherein the corresponding fire alarm characteristic value set is { 5070100 };
the fire alarm characteristic value of each detection object is assigned with a weight coefficient I, and the value assignment is as follows:
IT＝0.15,ICO＝0.15,
Figure GDA0002867331100000042
Ielec＝0.05,IL＝0.15,IU＝0.05,Iδ＝0.15,IP＝0.15
the current measured value and the corresponding fire alarm characteristic value of each detection object are as follows:
T＝50℃ XT＝40
CCO＝30ppm XCO＝20
Figure GDA0002867331100000043
Figure GDA0002867331100000044
Figure GDA0002867331100000045
Celec＝100ppm Xelec＝50
L＝3％ XL＝40
U＝3.5V XU＝70
δ＝800N Xδ＝30
P＝80Kpa XP＝50
the fire occurrence index is as follows:
Y＝0.15*40+0.15*20+0.05*60+0.05*50+0.05*500.05*50+0.15*40+0.05*70+0.15*30+0.15*50
＝41
the driving computer display screen displays Y as 41, namely the power battery is safe, the driving computer display screen can be normally used, and meanwhile, the driving computer display screen displays 'battery safety' in a green mode.
Example 2;
the threshold value of the detection object, the corresponding fire alarm characteristic value, and the weighting coefficient of the fire alarm characteristic value are the same as those in embodiment 1.
The current measured value and the corresponding fire alarm characteristic value of each detection object are as follows:
T＝120℃ XT＝75
CCO＝150ppm XCO＝70
Figure GDA0002867331100000046
Figure GDA0002867331100000051
Figure GDA0002867331100000052
Celec＝160ppm Xelec＝70
L＝8％ XL＝75
U＝3.5V XU＝70
δ＝1200N Xδ＝70
P＝120Kpa XP＝70
the fire occurrence index is as follows:
Y＝0.15*75+0.15*70+0.05*60+0.05*70+0.05*700.05*70+0.15*75+0.05*70+0.15*70+0.15*70
＝71
the driving computer display screen displays that Y is 71, namely the power battery has certain fire hazard or sign, and the driving computer display screen displays a dark yellow early warning, and the driving computer display screen displays that the fire hazard exists and the driving computer display screen performs immediate inspection.
Example 3;
the threshold value of the detection object, the corresponding fire alarm characteristic value, and the weighting coefficient of the fire alarm characteristic value are the same as those in embodiment 1.
The current measured value and the corresponding fire alarm characteristic value of each detection object are as follows:
T＝310℃ XT＝100
CCO＝200ppm XCO＝70
Figure GDA0002867331100000053
Figure GDA0002867331100000054
Figure GDA0002867331100000055
Celec＝170ppm Xelec＝70
L＝13％ XL＝85
U＝3.5V XU＝70
δ＝2000N Xδ＝70
P＝160Kpa XP＝70
due to XT＝100
Therefore, the indexes of fire occurrence are as follows:
Y＝100
the automobile fire extinguishing system has the advantages that Y is 100 displayed on the driving computer display screen, namely, the power battery has a fire disaster and should leave the automobile immediately, meanwhile, the fire extinguishing facility is started, the driving computer display screen is dark red and is used for displaying sound alarm, and people leave the automobile immediately after the fire disaster occurs.
The above embodiments are only used to further illustrate the quantitative warning and display method for fire disaster of power battery of electric vehicle of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.

Claims (1)

1. The utility model provides a quantitative early warning and display method of electric motor car power battery conflagration, includes power battery box, driving computer and the driving computer display screen of setting in the electric motor car, its characterized in that: temperature T and carbon monoxide concentration C in power battery box collected by traveling crane computerCOOxygen concentration
Figure FDA0002867331090000011
Concentration of carbon dioxide
Figure FDA0002867331090000012
Hydrocarbon concentration
Figure FDA0002867331090000013
Electrolyte characteristic concentration CelecThe deformation L, the voltage U, the stress delta and the pressure P are used as fire early warning detection objects;
setting N early warning threshold values and N +1 corresponding fire alarm characteristic values X for each detection object, wherein: n is more than or equal to 1, and X is more than or equal to 0 and less than or equal to 100;
for temperature T early warning threshold value and fire alarm characteristic value X corresponding to temperature TTThe setting of (a) is carried out,
using the set { T1 T2 T3 … TNDenotes N pre-alarm thresholds which,
by collections
Figure FDA0002867331090000014
Representing N +1 corresponding fire alarm characteristic values, wherein the detected temperature value is T, and the fire alarm characteristic value X corresponding to the temperatureTThe values are as follows:
Figure FDA0002867331090000015
wherein: t isj＜T≤Tj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for carbon monoxide concentration CCOEarly warning threshold and carbon monoxide concentration CCOCorresponding fire alarm characteristic value XCOIs set with the set { CCO1 CCO2 CCO3 … CCONDenotes N early warning thresholds, in sets
Figure FDA0002867331090000016
Representing N +1 corresponding fire alarm characteristic values, detecting the concentration of carbon monoxide as CCOFire alarm characteristic value X corresponding to carbon monoxide concentrationCOThe values are as follows:
Figure FDA0002867331090000017
wherein: cCOj＜CCO≤CCOj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for oxygen concentration
Figure FDA0002867331090000018
Early warning threshold and oxygenGas concentration
Figure FDA0002867331090000019
Corresponding fire alarm characteristic value
Figure FDA00028673310900000110
The setting of (a) is carried out,
by collections
Figure FDA00028673310900000111
Which represents N number of pre-warning thresholds,
by collections
Figure FDA00028673310900000112
Represents N +1 corresponding fire alarm characteristic values,
detecting oxygen concentration as
Figure FDA00028673310900000113
Fire alarm characteristic value corresponding to oxygen concentration
Figure FDA00028673310900000114
The values are as follows:
Figure FDA00028673310900000115
wherein:
Figure FDA00028673310900000116
is an integer;
for carbon dioxide concentration
Figure FDA00028673310900000117
Early warning threshold and carbon dioxide concentration
Figure FDA00028673310900000118
Corresponding fire alarm characteristic value
Figure FDA00028673310900000119
The setting of (a) is carried out,
by collections
Figure FDA00028673310900000120
Which represents N number of pre-warning thresholds,
by collections
Figure FDA00028673310900000121
Represents N +1 corresponding fire alarm characteristic values,
detecting the concentration of carbon dioxide as
Figure FDA00028673310900000122
Fire alarm characteristic value corresponding to carbon dioxide concentration
Figure FDA00028673310900000123
The values are as follows:
Figure FDA00028673310900000124
wherein:
Figure FDA00028673310900000125
is an integer;
for hydrocarbon concentration
Figure FDA00028673310900000126
Early warning threshold and hydrocarbon concentration
Figure FDA00028673310900000127
Corresponding fire alarm characteristic value
Figure FDA00028673310900000128
The setting of (a) is carried out,
by collections
Figure FDA00028673310900000129
Which represents N number of pre-warning thresholds,
by collections
Figure FDA00028673310900000130
Represents N +1 corresponding fire alarm characteristic values,
detecting a hydrocarbon concentration of
Figure FDA00028673310900000131
Fire alarm characteristic value corresponding to hydrocarbon concentration
Figure FDA00028673310900000132
The values are as follows:
Figure FDA00028673310900000133
wherein:
Figure FDA00028673310900000134
is an integer;
characteristic concentration C for electrolyteelecEarly warning threshold and electrolyte characteristic concentration CelecCorresponding fire alarm characteristic value XelecIs set with the set { Celec1 Celec2 Celec3 … CelecNDenotes N pre-alarm thresholds which,
by collections
Figure FDA0002867331090000021
Representing N +1 corresponding fire alarm characteristic values, and detecting that the concentration of the electrolyte characteristic substance is CelecAnd fire alarm characteristic value X corresponding to concentration of electrolyte characteristic substanceelecThe values are as follows:
Figure FDA0002867331090000022
wherein: celecj＜Celec≤Celecj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for the deformation L early warning threshold value and the fire alarm characteristic value X corresponding to the deformation LLThe setting of (a) is carried out,
using the set { L1 L2 L3 … LNDenotes N pre-alarm thresholds which,
by collections
Figure FDA0002867331090000023
Representing N +1 corresponding fire alarm characteristic values, detecting that the deformation quantity is L and the fire alarm characteristic value X corresponding to the deformation quantityLThe values are as follows:
Figure FDA0002867331090000024
wherein: l isj＜L≤Lj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for the fire alarm characteristic value X corresponding to the voltage U early warning threshold value and the voltage UUIs set with the set { U }1 U2 U3 … UNDenotes N early warning thresholds, in sets
Figure FDA0002867331090000025
Representing N +1 corresponding fire alarm characteristic values, detecting voltage as U, and fire alarm characteristic value X corresponding to voltageUThe values are as follows:
Figure FDA0002867331090000026
wherein: u shapej＜U≤Uj+1J is not less than 1 and not more than N, j is an integer
For stress delta early warning threshold value and fire alarm characteristic value X corresponding to stress deltaδThe setting of (a) is carried out,
using the set { delta1 δ2 δ3 … δNDenotes N pre-alarm thresholds which,
by collections
Figure FDA0002867331090000027
Represents N +1 phasesThe corresponding fire alarm characteristic value is set,
detecting stress as delta, and fire alarm characteristic value X corresponding to the stressδThe values are as follows:
Figure FDA0002867331090000028
wherein: deltaj＜δ≤δj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
for the pressure P early warning threshold value and the fire alarm characteristic value X corresponding to the pressure PPThe setting of (a) is carried out,
by the set { P1 P2 P3 … PNDenotes N early warning thresholds, in sets
Figure FDA0002867331090000029
Representing N +1 corresponding fire alarm characteristic values, detecting pressure as P, and fire alarm characteristic value X corresponding to the pressurePThe values are as follows:
Figure FDA00028673310900000210
wherein: pj＜P≤Pj+1J is more than or equal to 1 and less than or equal to N, and j is an integer;
assigning a weight coefficient I to the fire alarm characteristic value of each detection object, wherein I is more than or equal to 0, and the sum of all weight coefficients is 1, then:
Figure FDA00028673310900000211
wherein: i isTWeighting coefficients for the temperature fire alarm characteristic values; i isCOWeighting coefficients for the fire alarm characteristic values of the carbon monoxide concentration;
Figure FDA00028673310900000212
weighting coefficients for the oxygen concentration fire alarm characteristic values;
Figure FDA00028673310900000213
weighting coefficients for the carbon dioxide concentration fire alarm characteristic values;
Figure FDA00028673310900000214
weighting coefficients for the hydrocarbon concentration fire alarm characteristic values; i iselecWeighting coefficients for the electrolyte characteristic substance concentration fire alarm characteristic values; i isLWeighting coefficients for deformation quantity fire alarm characteristic values; i isUWeighting coefficients for the voltage fire alarm characteristic values; i isδWeighting coefficients for the stress fire alarm characteristic values; i isPWeighting coefficients for the pressure fire alarm characteristic values;
the fire occurrence index Y is used as a fire quantitative early warning index, Y is more than or equal to 0 and less than or equal to 100, and the Y is assigned as follows:
when any X is 100, Y is 100;
when any X is less than 100, the total content of the compound,
Figure FDA00028673310900000215
and set the Y value to 5 early warning ranges:
y is more than or equal to 90 and less than or equal to 100, which indicates that the power battery has a fire, and the power battery should leave the vehicle immediately and start a fire extinguishing facility;
y is more than or equal to 80 and less than 90, which indicates that the power battery is about to have a fire, and the power battery should leave the vehicle immediately and take emergency measures;
y is more than or equal to 70 and less than 80, which indicates that the power battery has certain fire hazard or sign and needs to be checked immediately;
y is more than or equal to 60 and less than 70, which indicates that the power battery has less potential safety hazard or sign and can be normally used, but the inspection needs to be paid attention to;
y is more than or equal to 0 and less than 60, which indicates that the power battery is safe and can be normally used;
according to the 5 early warning ranges set above, the safety condition of the power battery is displayed on a running computer display screen by numerical values, different colors and sound alarm, and the safety condition is mainly divided into five grades:
(1) green, Y value range is more than or equal to 0 and less than 60, and battery safety is displayed;
(2) the color is light yellow, the value range of Y is more than or equal to 60 and less than 70, and the potential safety hazard is shown, and the inspection is noticed;
(3) dark yellow, Y value range is more than or equal to 70 and less than 80, which shows that 'fire hazard exists, and immediate inspection is carried out';
(4) light red and sound alarm, Y is more than or equal to 80 and less than 90, and the display shows that 'a fire disaster is about to happen and people leave the vehicle immediately';
(5) and (4) performing sound alarm in a dark red state, wherein the Y value range is more than or equal to 90 and less than or equal to 100, and displaying that the fire disaster happens and the personnel leave the vehicle immediately.
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