CN110534825A - Lithium ion battery thermal runaway early warning method - Google Patents
Lithium ion battery thermal runaway early warning method Download PDFInfo
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- CN110534825A CN110534825A CN201910682445.5A CN201910682445A CN110534825A CN 110534825 A CN110534825 A CN 110534825A CN 201910682445 A CN201910682445 A CN 201910682445A CN 110534825 A CN110534825 A CN 110534825A
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- lithium ion
- ion battery
- thermal runaway
- preset condition
- battery
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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
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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
- H01M10/4285—Testing apparatus
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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
- H01M10/48—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
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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
- 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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
Abstract
The invention proposes a kind of lithium ion battery thermal runaway early warning methods, the following steps are included: step 1: carrying out analog simulation to lithium ion battery, when obtaining the normal charge and discharge of the lithium ion battery and the casing surface temperature data and deformation data of the lithium ion battery that overcharges thermal runaway moment, and establish battery temperature distributed model；Step 2: in battery temperature distributed model, the position of surface temperature highest point P1 and surface temperature minimum point P2 when determining lithium ion battery normal use；Step 3: pass through the temperature difference Δ T and deformation difference Δ d between monitoring device real-time monitoring lithium ion battery P1 and P2 in use；Step 4: the operating status of the lithium ion battery is judged according to preset condition.It is used in combination by battery body maximum temperature difference and shell deformation, can effectively carry out battery thermal runaway early monitoring.Judged by conditional logic, a possibility that battery thermal runaway is judged, accuracy rate is high.
Description
Technical field
The present invention relates to lithium battery safety monitoring technology fields, early in particular to a kind of lithium ion battery thermal runaway
Phase method for early warning.
Background technique
Lithium ion battery has many advantages, such as that operating voltage is high, energy density is big, has extended cycle life, as energy storage carrier
Using more and more, not only it is used widely in all kinds of consumer electronics, is also widely used in electric car, electrification at present
Learn the fields such as energy storage.
However, lithium ion battery not only can be since (such as internal short-circuit, encapsulation are broken for abuse (such as overcharge, overheat), manufacturing defect
Damage) etc. factors there is safety problem, can also in normal use process due to heat dissipation problem occur battery self-temperature distribution not
Uniformly, situations such as local temperature is excessively high causes battery internal short-circuit, then generates thermal runaway.
Temperature at positive and negative tab is taken to the monitoring of temperature in lithium battery energy storage battery system in the prior art, temperature is not at this
It can accurately reflect the temperature conditions and temperature branch of battery itself, therefore need one kind to accurately reflect battery self-temperature point
The method of cloth and the measure that the early warning of lithium ion battery thermal runaway is carried out based on this method.
Summary of the invention
In consideration of it, the invention proposes a kind of lithium ion battery thermal runaway early warning methods, it is intended to how effective solve
Carry out lithium ion battery thermal runaway early warning, to prevent battery thermal runaway asking to the fire hazard of energy-storage system later
Topic.
On one side, the invention proposes a kind of lithium ion battery thermal runaway early warning methods, comprising the following steps:
Step 1: analog simulation is carried out to lithium ion battery, when obtaining the normal charge and discharge of the lithium ion battery and is overcharged
The casing surface temperature data of the lithium ion battery of thermal runaway moment and the shell deformation data of the lithium ion battery, and according to
When the normal charge and discharge of the lithium ion battery obtained and the casing surface temperature number of the lithium ion battery that overcharges thermal runaway moment
Battery model is established according to the deformation data with the lithium ion battery；
Step 2: in the battery model, the surface temperature highest point when lithium ion battery normal use is determined
P1 and surface temperature minimum point P2；According to the P1 and P2, obtains the temperature difference Δ T1 between the P1 and P2, obtains the P1
The surface temperature difference Δ T2 of the lithium ion battery of thermal runaway moment is overcharged between P2 and is obtained between the P1 and P2
The lithium ion battery overcharge the shell deformation amount Δ d1 of thermal runaway moment；
Step 3: the temperature difference Δ T between the P1 and P2 of lithium ion battery described in real-time monitoring in use
With deformation difference Δ d；
Step 4: preset condition is determined according to the Δ T1, Δ T2, Δ d1, Δ T and Δ d, is sentenced according to the preset condition
Break the operating status of the lithium ion battery, and judges whether the lithium ion battery is in the early period of thermal runaway.
Further, in the step 4, when judge the lithium ion battery into be in thermal runaway early period when, stop
Battery work, and alarm signal is transferred to fire-fighting system, the fire-fighting system is opened, to drop to the lithium ion battery
Temperature.
Further, in the step 2, after determining P1 and P2, the accuracy of the P1 and P2 are verified.
Further, the preset condition includes the first preset condition, the second preset condition and third preset condition,
The operating status that the lithium ion battery is judged according to preset condition includes:
When the lithium ion battery meets first preset condition, judges that the lithium ion battery is in and work normally
State；
When the lithium ion battery meets second preset condition, judge that the lithium ion battery has the wind of thermal runaway
Danger；
When the lithium ion battery meets the third preset condition, before judging that the lithium ion battery is in thermal runaway
Phase.
Further, first preset condition are as follows:
The lithium ion battery meets the first temperature restraint:
Δ T < x1 × Δ T1 and
The lithium ion battery meets the first deformation constraint:
Δ d < y1 × Δ d1；
Wherein, the value range that the value range of x1 is 0.6~1, y1 is 0.1~0.3.
Further, second preset condition are as follows:
The lithium ion battery meets second temperature constraint:
X2 × Δ T1 >=Δ T >=x3 × Δ T1 or
The lithium ion battery meets the second deformation constraint:
y2×Δd1≥Δd≥y3×Δd1；
Wherein, the value range that the value range that the value range of x2 is 1.5~1.8, x3 is 1~1.5, y2 is 0.4~
0.5, y3 value range is 0.3~0.4.
Further, the third preset condition are as follows:
The lithium ion battery meets third temperature restraint:
Δ T > x4 × Δ T1 or
The lithium ion battery meets third deformation constraint:
Δ d > y4 × Δ d1；
Wherein, the value range that the value range of x4 is 0.8~1, y4 is 0.5~0.6.
Further, the preset condition further includes the 4th preset condition,
The operating status that the lithium ion battery is judged according to preset condition includes:
When the lithium ion battery meets four preset condition, judge that the lithium ion battery is in thermal runaway shape
State.
Further, the 4th preset condition are as follows:
The lithium ion battery meets the 4th temperature restraint:
Δ T >=x5 × Δ T2 or
The lithium ion battery meets the 4th deformation constraint:
Δd≥y5×Δd1；
Wherein, x5 > 1, y5 > 0.7.
Further, in the step 3, by lithium ion battery described in monitoring device real-time monitoring in use process
In the P1 and P2 between temperature difference Δ T and deformation difference Δ d；
The monitoring device includes temperature sensor and changing sensor, by the temperature sensor acquire the lithium from
The temperature data of sub- battery acquires the deformation data of the lithium ion battery by the changing sensor.
Compared with prior art, the beneficial effects of the present invention are method of the invention is by carrying out lithium ion battery
Analog simulation obtains the temperature number of lithium ion battery normal operation and thermal runaway moment to establish battery model in battery model
According to shell deformation data to determine preset condition, and temperature difference and deformation of the real-time monitoring lithium ion battery in normal use
Difference temperature difference and deformation difference is compared with preset condition, according to comparison result to judge lithium ion battery in normal use
When operating status, and the thermal runaway early monitoring of lithium ion battery can be effectively performed in lithium ion battery normal use,
It prevents lithium ion battery from the case where thermal runaway occur, improves security performance when lithium ion battery operation.
The temperature monitoring point and distortion measurement point of battery are accurately positioned by analog simulation, has comprehensively considered battery electrolyte
The normal deformation of shell caused by vaporizing can, explosion-proof valve rupture excessively high in lithium battery temperature by the comparison of monitoring quantity and predetermined amount
It is preceding that anticipation, the working condition of regulating cell energy-storage system are made to battery status in time, and pre-warning signal is transferred to alarm,
User of service's battery thermal runaway risk can be reminded.
Further, it is used in combination by battery body maximum temperature difference and shell deformation, can effectively carry out battery heat mistake
Control early monitoring.Judged by conditional logic, a possibility that battery thermal runaway is judged, accuracy rate is high, avoids gas
The hysteresis quality of detection and single temperature monitoring.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the flow chart of lithium ion battery thermal runaway early warning method provided in an embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig.1, the present embodiment proposes a kind of lithium ion battery thermal runaway early warning method of function, including following step
It is rapid:
Step 1 S101: carrying out analog simulation to lithium ion battery, when obtaining the normal charge and discharge of the lithium ion battery and
The casing surface temperature data of the lithium ion battery of thermal runaway moment and the shell deformation data of the lithium ion battery are overcharged, and
When charge and discharge normal according to the lithium ion battery of acquisition and the surface of shell temperature of the lithium ion battery that overcharges thermal runaway moment
The deformation data of degree evidence and the lithium ion battery establishes battery model；
Step 2 S102: in the battery model, surface temperature when determining the lithium ion battery normal use is most
High point P1 and surface temperature minimum point P2；According to the P1 and P2, obtains the temperature difference Δ T1 between the P1 and P2, obtains institute
It states the surface temperature difference Δ T2 for overcharging the lithium ion battery of thermal runaway moment between P1 and P2 and obtains the P1 and P2
Between the lithium ion battery overcharge the shell deformation amount Δ d1 of thermal runaway moment；
Step 3 S103: the temperature difference between the P1 and P2 of lithium ion battery described in real-time monitoring in use
Δ T and deformation difference Δ d；
Step 4 S104: preset condition is determined according to the Δ T1, Δ T2, Δ d1, Δ T and Δ d, according to the default item
Part judges the operating status of the lithium ion battery, and judges whether the lithium ion battery is in the early period of thermal runaway.
By carrying out analog simulation to lithium ion battery to establish battery model, lithium ion battery is obtained in battery model
It operates normally with the temperature data of thermal runaway moment and shell deformation data to determine preset condition, and real-time monitoring lithium-ion electric
Temperature difference and deformation of the pond in normal use are poor, and temperature difference and deformation difference are compared with preset condition, tie according to comparing
Fruit can be effectively performed with judging lithium ion battery operating status in normal use in lithium ion battery normal use
The thermal runaway early monitoring of lithium ion battery, prevents lithium ion battery from the case where thermal runaway occur, improves lithium ion battery fortune
Security performance when row.
Specifically, first with the normal charge and discharge of simulation software analog simulation lithium ion battery and overcharging thermal runaway moment
Casing surface temperature distribution and battery deformation, establish battery temperature distributed model, the highest point position of temperature distribution and
Lowest point, and with laboratory facilities verifying simulation result accuracy；Table when survey calculation lithium ion battery normal use
The temperature of thermal runaway moment is overcharged between face thermal self-restraint stress P1 and the temperature difference Δ T1 and P1 and P2 of surface temperature minimum point P2
Spend the difference Δ T2 and thickness of shell deformation quantity Δ d1 of the two o'clock；Using default in monitoring device monitoring lithium ion battery use process
The temperature difference Δ T and deformation difference Δ d of two o'clock P1, P2, and judge according to preset condition the operating status of lithium ion battery, and judge
Whether lithium ion battery is in the early period of thermal runaway.
Specifically, above-mentioned simulation softward is preferably Comsol and/or Fluent software.Above-mentioned laboratory facilities were preferably
Fill laboratory facilities.
Specifically, adding the method for experimental verification to determine maximum two o'clock P1, P2 of the battery temperature difference using analog simulation, to protect
Demonstrate,prove the accuracy of P1 and P2.
It can be seen that going out, the temperature monitoring point and distortion measurement point of battery are accurately positioned by analog simulation, comprehensively considers
The normal deformation of shell by the comparison of monitoring quantity and predetermined amount can be in lithium battery temperature mistake caused by battery electrolyte vaporizes
Anticipation made to battery status in time before high, explosion-proof valve rupture, the working condition of regulating cell energy-storage system, and by pre-warning signal
It is transferred to alarm, user of service's battery thermal runaway risk can be reminded.
Further, it is used in combination by battery body maximum temperature difference and shell deformation, can effectively carry out battery heat mistake
Control early monitoring.Judged by conditional logic, a possibility that battery thermal runaway is judged, accuracy rate is high, avoids gas
The hysteresis quality of detection and single temperature monitoring.
Specifically, in step 2 S102, after determining P1 and P2, by testing to verify the accurate of P1 and P2
Property.
Specifically, in step 4 S104, when judging lithium ion battery into the early period for being in thermal runaway, stop battery
Work, and alarm signal is transferred to fire-fighting system, fire-fighting system is opened, to cool down to lithium ion battery.
Specifically, the charge and discharge electric condition and battery of temperature difference Δ T1, Δ T2 and thickness of shell deformation quantity Δ d and battery are advised
Lattice are related, can be determined according to the actual situation.
Specifically, preset condition includes the first preset condition, the second preset condition and third preset condition, wherein root
The operating status for judging the lithium ion battery according to preset condition includes:
When lithium ion battery meets the first preset condition, judge that lithium ion battery is in normal operating conditions；
When lithium ion battery meets the second preset condition, judges that lithium ion battery temperature is excessively high, there is the risk of thermal runaway,
So that lithium ion battery is stopped working, and exports pre-warning signal；
When lithium ion battery meets third preset condition, judge that lithium ion battery is in thermal runaway early period.
As can be seen that being judged by conditional logic, a possibility that battery thermal runaway, is judged, standard is greatly improved
True rate avoids the hysteresis quality of gas detection and single temperature monitoring.
Specifically, first preset condition are as follows:
The lithium ion battery meets the first temperature restraint:
Δ T < x1 × Δ T1 and
The lithium ion battery meets the first deformation constraint:
Δ d < y1 × Δ d1；
Wherein, the value range that the value range of x1 is 0.6~1, y1 is 0.1~0.3.
When lithium ion battery meets Δ T < x1 × Δ T1 and Δ d < y1 × Δ d1 simultaneously, then judge at lithium ion battery
In normal operating condition.
Preferably, when lithium ion battery meets Δ T < 0.8 Δ T1 and Δ d 0.2 Δ d1 of < simultaneously, then determine lithium ion
Battery is in normal operating conditions, does not make early warning to battery thermal runaway.
Specifically, the second preset condition are as follows:
The lithium ion battery meets second temperature constraint:
X2 × Δ T1 >=Δ T >=x3 × Δ T1 or
The lithium ion battery meets the second deformation constraint:
y2×Δd1≥Δd≥y3×Δd1；
Wherein, the value range that the value range that the value range of x2 is 1.5~1.8, x3 is 1~1.5, y2 is 0.4~
0.5, y3 value range is 0.3~0.4.
When lithium ion battery meet x2 × Δ T1 >=Δ T >=x3 × Δ T1 or y2 × Δ d1 >=Δ d >=y3 × Δ d1 its
One of when, then the lithium ion battery judged has the risk of thermal runaway.
Preferably, when lithium ion battery meets the 1.65 Δ T1 >=Δ of Δ T >=1.25 T1 or 0.45 Δ d1 >=Δ d >=0.35
When one of Δ d1, then determine that lithium ion battery has the risk of thermal runaway, stops battery work at once, and it is pre- to make alarm
It is alert, pre-warning signal is transferred to alarm, user of service's battery thermal runaway risk can be reminded.
Specifically, third preset condition are as follows:
The lithium ion battery meets third temperature restraint:
Δ T > x4 × Δ T1 or
The lithium ion battery meets third deformation constraint:
Δ d > y4 × Δ d1；
Wherein, the value range that the value range of x4 is 0.8~1, y4 is 0.5~0.6.
When lithium ion battery meets one of Δ T > x4 × Δ T1 or Δ d > y4 × Δ d1, that is, can determine that lithium from
Sub- battery is in the early period of thermal runaway.
Preferably, it when lithium ion battery meets one of 0.8 Δ d1 of Δ T > 0.9 Δ T1 and Δ d >, that is, can determine that
Lithium ion battery is in the early period of thermal runaway, and thermal runaway may occur at any time, stops battery work, and pre-warning signal is transferred to
Fire-fighting system, fire-fighting system open, cool down to lithium ion battery.
Specifically, the preset condition further includes the 4th preset condition, the lithium-ion electric is judged according to preset condition
The operating status in pond includes: to judge at the lithium ion battery when the lithium ion battery meets four preset condition
In thermal runaway state.
Specifically, the 4th preset condition are as follows:
The lithium ion battery meets the 4th temperature restraint:
Δ T >=x5 × Δ T2 or
The lithium ion battery meets the 4th deformation constraint:
Δd≥y5×Δd1；
Wherein, x5 > 1, y5 > 0.7, that is, value range of the value range of x5 greater than 1, y5 is greater than 0.7.
When the lithium ion battery meets one of Δ T >=x5 × Δ T2 or Δ d >=y5 × Δ d1, that is, can determine that
The lithium ion battery is in thermal runaway state.
Preferably, when the lithium ion battery meets one of the Δ of Δ T >=1.5 T2 or the Δ of Δ d >=1.1 d1, i.e.,
It can determine that the lithium ion battery is in thermal runaway state；
Specifically, monitoring device includes temperature sensor and changing sensor, temperature sensor is for acquiring lithium ion
The temperature data of battery, changing sensor are used to acquire the deformation data of lithium ion battery.
Specifically, what temperature and battery case changing sensor either two-in-one device were also possible to be separately monitored
Device
Specifically, the judgement of the operating status of above-mentioned lithium ion battery is executed by processing unit in battery management system,
Specifically, above-mentioned the-the four preset condition of first preset condition, the running lithium that monitoring device acquires in real time built in processing unit
The temperature and deformation data of ion battery, and the temperature for the lithium ion battery that it is acquired in real time and deformation data are transmitted to processing
Unit, first default item of the processing unit built in real time by the temperature of its received lithium ion battery and deformation data with it
Four preset condition of part-the is compared, and the output judging result implemented.
Specifically, processing unit and alarm and fire-fighting system communicate to connect, to alarm and fire-fighting system progress
Control.
Can be seen that above-mentioned lithium battery thermal runaway early warning method, have the following advantages that by maximum temperature difference judgement and
Shell deformation judges the strategy combined, greatly improves the accuracy of judging result, and improve judging efficiency；It is maximum
The temperature difference and the equal given threshold Δ T1 and Δ d1 of maximum shell deformation, monitor value is rear to a certain degree close to threshold value or stops battery work
Make, issue alarm, or starting fire plant, corresponding processing can be timely made according to judging result, is effectively prevented
There is the generation of the case where thermal runaway in lithium ion battery, that is, can, electrolyte vaporization excessively high in lithium battery temperature, shell deformation, explosion-proof
Anticipation is made to battery status in time before valve rupture, guarantees the operation of lithium ion battery efficient stable and safety；It is imitative using simulation
The mode temperature that very combines with experimental verification, deformation monitoring point, improve the accuracy of judging result.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of lithium ion battery thermal runaway early warning method, which comprises the following steps:
Step 1: carrying out analog simulation to lithium ion battery, when obtaining the normal charge and discharge of the lithium ion battery and overcharges hot mistake
The casing surface temperature data of the lithium ion battery of moment and the shell deformation data of the lithium ion battery are controlled, and according to acquisition
The lithium ion battery normal charge and discharge when and the lithium ion battery that overcharges thermal runaway moment casing surface temperature data and
The deformation data of the lithium ion battery establishes battery model；
Step 2: in the battery model, surface temperature highest point P1 when determining the lithium ion battery normal use and
Surface temperature minimum point P2；According to the P1 and P2, obtains the temperature difference Δ T1 between the P1 and P2, obtains the P1 and P2
Between overcharge thermal runaway moment the lithium ion battery surface temperature difference Δ T2 and obtain institute between the P1 and P2
State the shell deformation amount Δ d1 that lithium ion battery overcharges thermal runaway moment；
Step 3: temperature difference Δ T and shape between the P1 and P2 of lithium ion battery described in real-time monitoring in use
Variation Δ d；
Step 4: preset condition is determined according to the Δ T1, Δ T2, Δ d1, Δ T and Δ d, institute is judged according to the preset condition
The operating status of lithium ion battery is stated, and judges whether the lithium ion battery is in the early period of thermal runaway.
2. lithium ion battery thermal runaway early warning method according to claim 1, which is characterized in that in the step 4
In, when judging the lithium ion battery into the early period for being in thermal runaway, stops battery work, and alarm signal is transferred to and is disappeared
Anti- system opens the fire-fighting system, to cool down to the lithium ion battery.
3. lithium ion battery thermal runaway early warning method according to claim 1, which is characterized in that in the step 2
In, after determining P1 and P2, verify the accuracy of the P1 and P2.
4. lithium ion battery thermal runaway early warning method according to claim 2, which is characterized in that the preset condition
Including the first preset condition, the second preset condition and third preset condition,
The operating status that the lithium ion battery is judged according to preset condition includes:
When the lithium ion battery meets first preset condition, judges that the lithium ion battery is in and work normally shape
State；
When the lithium ion battery meets second preset condition, judge that the lithium ion battery has the risk of thermal runaway；
When the lithium ion battery meets the third preset condition, judge that the lithium ion battery is in thermal runaway early period.
5. lithium ion battery thermal runaway early warning method according to claim 4, which is characterized in that described first is default
Condition are as follows:
The lithium ion battery meets the first temperature restraint:
Δ T < x1 × Δ T1 and
The lithium ion battery meets the first deformation constraint:
Δ d < y1 × Δ d1；
Wherein, the value range that the value range of x1 is 0.6~1, y1 is 0.1~0.3.
6. lithium ion battery thermal runaway early warning method according to claim 4, which is characterized in that described second is default
Condition are as follows:
The lithium ion battery meets second temperature constraint:
X2 × Δ T1 >=Δ T >=x3 × Δ T1 or
The lithium ion battery meets the second deformation constraint:
y2×Δd1≥Δd≥y3×Δd1；
Wherein, the value range that the value range that the value range of x2 is 1.5~1.8, x3 is 1~1.5, y2 is 0.4~0.5,
The value range of y3 is 0.3~0.4.
7. lithium ion battery thermal runaway early warning method according to claim 4, which is characterized in that the third is default
Condition are as follows:
The lithium ion battery meets third temperature restraint:
Δ T > x4 × Δ T1 or
The lithium ion battery meets third deformation constraint:
Δ d > y4 × Δ d1；
Wherein, the value range that the value range of x4 is 0.8~1, y4 is 0.5~0.6.
8. lithium ion battery thermal runaway early warning method according to claim 4, which is characterized in that the preset condition
It further include the 4th preset condition,
The operating status that the lithium ion battery is judged according to preset condition includes:
When the lithium ion battery meets four preset condition, judge that the lithium ion battery is in thermal runaway state.
9. lithium ion battery thermal runaway early warning method according to claim 8, which is characterized in that the described 4th is default
Condition are as follows:
The lithium ion battery meets the 4th temperature restraint:
Δ T >=x5 × Δ T2 or
The lithium ion battery meets the 4th deformation constraint:
Δd≥y5×Δd1；
Wherein, x5 > 1, y5 > 0.7.
10. lithium ion battery thermal runaway early warning method according to claim 1, which is characterized in that in the step
In three, pass through the temperature difference Δ between the P1 and P2 of lithium ion battery described in monitoring device real-time monitoring in use
T and deformation difference Δ d；
The monitoring device includes temperature sensor and changing sensor, acquires the lithium-ion electric by the temperature sensor
The temperature data in pond acquires the deformation data of the lithium ion battery by the changing sensor.
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Cited By (8)
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| CN110970679A (en) * | 2019-12-26 | 2020-04-07 | 重庆长安新能源汽车科技有限公司 | Battery pack temperature sensor rationality diagnosis method based on thermal symmetry |
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| CN112345943A (en) * | 2020-11-13 | 2021-02-09 | 东风汽车集团有限公司 | Battery thermal runaway early warning method and device |
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