CN108446435A - Power battery electrode material thermal stability judgment method, judgment means and computer readable storage medium - Google Patents
Power battery electrode material thermal stability judgment method, judgment means and computer readable storage medium Download PDFInfo
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Abstract
This application discloses a kind of power battery electrode material thermal stability judgment method, judgment means and computer readable storage mediums.The method includes：S10 selects the temperature data of the first power battery electrode material；S20 obtains the heat production power data of the first power battery electrode material according to the temperature data of the first power battery electrode material according to the Thermal degration reaction kinetics model of electrode material；S30 judges the thermal stability of the first power battery electrode material by the heat production power data compared with standard value.The method can be used for evaluating the thermal stability of the first power battery electrode material at different temperatures, can carry out comprehensive assessment to the thermal stability of the first power battery electrode material, can improve the assessment efficiency of the thermal stability of electrode material.
Description
Technical field
This application involves field of batteries, more particularly to a kind of power battery electrode material thermal stability judgment method, sentence
Disconnected device and computer readable storage medium.
Background technology
Traditional electric vehicle is the main body of new-energy automobile, and power battery is the core energy source of electric vehicle.Lithium ion
Power battery (hereinafter referred to as " power battery ") has energy/power density height, advantage with long service life, is at present using most
Extensive automobile-used chemomotive force source.Since vehicle-mounted space is limited, to increase the course continuation mileage of electric vehicle, in addition to limited vehicle-mounted
In space except more dress power batteries, the ratio energy of power battery is more improved.In order to promote the ratio energy of battery, researcher
Develop various new material systems.However, when these new material systems are used for the battery of extensive industrialization, need full
The a series of professional standard of foot, including safety standard etc..Since the power battery of more high-energy-density is when occurring safety accident,
The energy of thermal runaway release is more concentrated, during the designing and developing of high-energy-density power battery, it is necessary to assure scale of mass production
The thermal runaway security performance of battery afterwards.
The safety of power battery is mainly related to electrode material thermal stability.Usually, power battery electrode material
Thermal stability can obtain electrode material heat point at a certain temperature by acceleration amount Thermal test or differential scanning amount Thermal test
The rate of heat production of solution assesses.However, throughput Thermal test come assess the method for electrode material thermal stability can only qualitative evaluation
Thermal stability of the electrode material under specific heating condition, assessment result are difficult to be extended under other heating conditions, can not be comprehensive
Close the thermal stability of assessment electrode material.
Invention content
Based on this, it is necessary to can only be specific for the method for discrimination of the thermal stability of traditional power battery electrode material
Under the conditions of the problem of using, providing a kind of power battery electrode material thermal stability judgment method, judgment means and computer can
Read storage medium.
A kind of power battery electrode material thermal stability judgment method, including：
S10 selects the temperature data of the first power battery electrode material；
S20, it is dynamic according to the pyrolysis of electrode material according to the temperature data of the first power battery electrode material
Mechanical model obtains the heat production power data of the first power battery electrode material；And
S30 judges that the heat of the first power battery electrode material is steady by the heat production power data compared with standard value
It is qualitative.
In one embodiment, in the S20, the method for building up of the Thermal degration reaction kinetics model includes：
S21 provides one second power battery, and carries out battery charging and discharging processing to second power battery；
S22, dismantling charge and discharge treated second power battery, to obtain the second power battery electrode material；
S23 chooses heating rate value, is swept to the second power battery electrode material according to the heating rate value
Calorimetric test is retouched, the test temperature data and experiment heat production power data of the reaction of the second power battery electrode material are obtained
Temperature-power relationship curve；And
S24 calculates the kinetics of the second power battery electrode material according to the temperature-power relationship curve
Parameter value obtains the Thermal degration reaction kinetics model according to the reactive kinetics parameters value.
In one embodiment, the S24 includes：
S241, peak temperature data and the peak temperature data for obtaining the temperature-power relationship curve are corresponding
Heating rate value；
S242 establishes the reaction kinetics equation of the second power battery electrode material, according to mass-conservation equation, puts
Thermal power calculation formula, the reaction kinetics equation obtain the heat production power calculation of the second power battery electrode material
Formula；
S243, according to the peak temperature data and the corresponding heating rate value of the peak temperature data, according to heat point
Kinetics equation is analysed, the heat production power meter formula calculates the reactive kinetics parameters value；And
S244, according to the reaction kinetics equation, the heat production power meter formula and the reactive kinetics parameters value
Obtain the Thermal degration reaction kinetics model.
In one embodiment, in the S242, the reaction kinetics equation is:
The mass-conservation equation is：
The heat release rating formula is：
Wherein, x represents the reaction of the second power battery electrode material；cxRepresent the second power battery electrode material
The normalization concentration of the reactant of the reaction of material, unit are 1；AxThe forward direction factor of reaction is represented, unit is s-1；Ea,xIt represents anti-
The activation energy answered, unit are Jmol-1；R is ideal gas constant 8.314Jmol-1·K-1, nxFor the series of reaction, unit
It is the temperature that 1, T is the second electrode material；QxRepresent the heat release power of the reaction；M represents the quality of the reactant,
Unit is g；HxRepresent the reaction enthalpy of the reaction x of second electrode material described in the reactive kinetics parameters, unit Jg-1；Ax, Ea,x,nxAnd HxRepresent the reactive kinetics parameters.
In one embodiment, the heat production power meter formula is：
Q=Qx_1+Qx_2+Qx_3+… (4)
Wherein, subscript x_1, x_2, x_3 ... represent the reaction of the different second electrode materials.
In one embodiment, the Thermal Analysis Kinetics equation is：
Wherein, βiRepresent the heating rate value, Tpi,xRepresent the peak temperature data.
In one embodiment, before the S241, further include：
S240 obtains the exothermic reaction of the second power battery electrode material according to the temperature-power relationship curve
Number.
In one embodiment, in the S243, the reactive kinetics parameters value is calculated by numerical optimization.
A kind of power battery electrode material thermal stability judgment means, including power battery electrode material thermal stability judge
Equipment and computer, Computer include memory, processor and storage on a memory and can run on a processor
Computer program, the processor use power battery electrode material thermal stability judgement side when executing the computer program
Method, the method includes：
S10 selects the temperature data of the first power battery electrode material；
S20, it is dynamic according to the pyrolysis of electrode material according to the temperature data of the first power battery electrode material
Mechanical model obtains the heat production power data of the first power battery electrode material；And
S30 judges that the heat of the first power battery electrode material is steady by the heat production power data compared with standard value
It is qualitative.
A kind of computer readable storage medium, is stored thereon with computer program, can be used when which is executed by processor
In the step of executing the method.
Power battery electrode material thermal stability judgment method provided by the present application, by by the first power battery electrode material
The temperature data of material inputs the Thermal degration reaction kinetics model, and then obtains the production of the first power battery electrode material
Thermal power data.It may determine that the thermostabilization of the first power battery electrode material according to the size of the heat production power data
Property.The power battery electrode material thermal stability judgment method, which can be used for evaluating the first power battery electrode material, to exist
Thermal stability under different temperatures can carry out comprehensive assessment, energy to the thermal stability of the first power battery electrode material
Enough improve the assessment efficiency of the thermal stability of electrode material.
Description of the drawings
Fig. 1 is power battery electrode material thermal stability judgment method flow chart provided by the embodiments of the present application；
Fig. 2 is scanning calorimetric of the second power battery electrode material provided by the embodiments of the present application under a heating rate
The temperature-power relationship curve graph of test；
Fig. 3 is scanning calorimetric of the second power battery electrode material provided by the embodiments of the present application under multiple heating rates
The temperature-power relationship curve graph of test；
Fig. 4 is the exothermic reaction of the second power battery electrode material provided by the embodiments of the present application's
Relational graph；
Fig. 5 is the prediction result of Thermal degration reaction kinetics model and the comparison diagram of experimental result in the embodiment of the present application；
Fig. 6 is power battery electrode material thermal stability judgment means schematic diagram in the embodiment of the present application.
Specific implementation mode
In order to make present invention purpose, technical solution and technique effect be more clearly understood, below in conjunction with attached drawing pair
The specific embodiment of the application is described.It should be appreciated that specific embodiment described herein is only used to explain the application,
It is not used to limit the application.
Fig. 1 is referred to, the embodiment of the present application provides a kind of power battery electrode material thermal stability judgment method.It is described dynamic
Power battery electrode material thermal stability judgment method includes step：
S10 selects the temperature data of the first power battery electrode material；
S20, it is dynamic according to the pyrolysis of electrode material according to the temperature data of the first power battery electrode material
Mechanical model obtains the heat production power data of the first power battery electrode material；And
S30 judges that the heat of the first power battery electrode material is steady by the heat production power data compared with standard value
It is qualitative.
In step slo, the temperature data of the first power battery electrode material can be to first power electric
Pond electrode material carries out battery temperature when thermal stability judgement.First power battery can be lithium battery, or
Other types of battery.
In step S20, first power battery electrode may determine that by the Thermal degration reaction kinetics model
Thermal stability of the material under the battery temperature.The battery temperature data is inputted into the Thermal degration reaction kinetics mould
Type can obtain the heat production power data.By the size of the heat production power data, first power electric can be prejudged
The thermal stability of pond electrode material.The pyrolysis of electrode material of lithium battery can be first established in one of the embodiments,
Kinetic model.It, can be directly to the pyrolysis power when testing the thermal stability of similar electrode material of lithium battery
Temperature data described in mode input is learned, the heat production power data for obtaining similar electrode material of lithium battery is calculated.It is appreciated that described
Thermal degration reaction kinetics model is established according to the physicochemical properties of the first power battery electrode material, therefore institute
State the judgement that Thermal degration reaction kinetics model can be adapted for the thermal stability of the similar first power battery electrode material.
In step s 30, the thermal stability of the first power battery electrode material is may determine that according to the standard value.
The standard value can be the critical value for the thermal stability for judging the first power battery electrode material.The critical value can be with
For a heat production power data value.The critical value can be obtained rule of thumb.It is less than the standard in the heat production power data
When value, it can be determined that the first power battery electrode material is in stable state.When the heat production power data is more than the mark
When quasi- value, it can be determined that the first power battery electrode material plays pendulum.
The standard value can be " high, medium and low " three sub- standard values in one of the embodiments,.It is described " it is high, in,
It is low " three sub- standard values can divide according to the size of heat production power data numerical value." high, medium and low " three sub- standard values
Corresponding heat production power data numerical value can be sequentially reduced.Three sub- standard values can be by first power battery electrode
The thermal stability of material is divided into 3 ranks.Described in being more than when the heat production power data of the first power battery electrode material
When "high" substandard value, illustrate that the thermal stability of the first power battery electrode material is worst.When first power battery
The heat production power data of electrode material be in the "high" substandard value and it is described " in " between substandard value when, illustrate described
The thermal stability of one power battery electrode material is poor.When the heat production power data of the first power battery electrode material is in
It is described " in " between substandard value and " low " the substandard value when, illustrate the thermostabilization of the first power battery electrode material
Property is preferable.When the heat production power data of the first power battery electrode material is less than described " low " substandard value, illustrate institute
The thermal stability for stating the first power battery electrode material is fine.
Power battery electrode material thermal stability judgment method provided by the embodiments of the present application, by by the first power battery
The temperature data of electrode material inputs the Thermal degration reaction kinetics model, and then obtains the first power battery electrode material
The heat production power data of material.The first power battery electrode material is may determine that according to the size of the heat production power data
Thermal stability.The power battery electrode material thermal stability judgment method can be used for evaluating first power battery electrode
The thermal stability of material at different temperatures can carry out the thermal stability of the first power battery electrode material synthesis and comment
Estimate, the assessment efficiency of the thermal stability of electrode material can be improved.
The method for building up of the Thermal degration reaction kinetics model includes in one of the embodiments,：
S21 provides one second power battery, and carries out battery charging and discharging processing to second power battery；
S22, dismantling charge and discharge treated second power battery, to obtain the second power battery electrode material；
S23 chooses heating rate value, is swept to the second power battery electrode material according to the heating rate value
Calorimetric test is retouched, the test temperature data and experiment heat production power data of the reaction of the second power battery electrode material are obtained
Temperature-power relationship curve；And
S24 calculates the kinetics of the second power battery electrode material according to the temperature-power relationship curve
Parameter value obtains the Thermal degration reaction kinetics model according to the reactive kinetics parameters value.
In the step s 21, second power battery is made first, determines the second power battery electrode material.Institute
State the physicochemical properties material of the physicochemical properties and first power battery electrode of the second power battery electrode material
It is identical.It is appreciated that establishing the Thermal degration reaction kinetics model according to the second power battery electrode material.By institute
It is identical with the physicochemical properties of material of the first power battery to state the second power battery, first power battery
The thermal stability of electrode material can be judged by the Thermal degration reaction kinetics model.
It can select according to actual needs in one of the embodiments, described in conductive agent, binder and collector making
Second power battery.The conductive agent can be acetylene black, and the binder can be Kynoar (PVDF).The afflux
Body is depending on required electrode material to be tested.The positive electrode of second power battery can select aluminium foil as afflux
Body, and the negative material of second power battery can select copper foil for collector.When making electrode plates, by electrode active
Property material, conductive agent and binder according to setting proportioning mix, mix well into paste, be evenly coated on collector, finally press
Drying is cut out in fact obtains the electrode plates.The second power battery electrode material is ternary in one of the embodiments,
Positive electrode active materials (LixNi1/3Co1/3Mn1/3O2), conductive agent is acetylene black, and binder is Kynoar (PVDF), collector
For aluminium foil, negative current collector is copper foil.The proportioning of electrode anode can be ternary positive electrode active material：Conductive agent：Binder=
95：3：2.
It can use the electrode anode, lithium piece cathode that suitable electrolyte is added, puts in one of the embodiments,
Diaphragm is set, button cell is prepared.The electrolyte can be made of lithium salts and organic solvent.And diaphragm can be the painting of single side ceramics
Polyethylene (PE) diaphragm covered.The button cell can be melted into after completing so that electrode plates Surface Creation is steady
Fixed interface protective film.Charge and discharge electric treatment is carried out to the button cell prepared, adjusts the charged shape of the button cell
State is to target state-of-charge.The target state-of-charge can be arbitrary state-of-charge.It in one of the embodiments, will be described
Button cell is adjusted to 4.2V, for assessing the thermal decomposition characteristic of the ternary positive electrode active material at 4.2v.
The button power battery for being up to target state-of-charge is disassembled in the glove box full of argon gas, obtains electrode
Pole piece.The electrode plates of acquisition are soaked for a period of time (being usually half an hour) with dimethyl carbonate solution, wash away pole piece
The lithium salts of upper remnants, and dry, it is carried out in glove box in whole process.Then by the second power battery electrode material from
It scrapes, is lightly ground on collector, obtain the powder of the second power battery electrode material.Choose the appropriate powder conduct
The second power battery electrode material.
In S23, the second power battery electrode material can be put into the sample making earthenware of differential scanning calorimeter
In crucible.Addition can be selected according to test purpose in one of the embodiments, or does not add electrolyte, and is sealed,
To obtain scanning amount Thermal test sample.The composition of the test sample is as follows in one of the embodiments,：Tertiary cathode activity
Material+electrolyte, mass ratio 2：1.
Differential scanning calorimeter can be used in one of the embodiments, choose a heating rate to the test
Sample carries out single pass calorimetric test.The heating rate can be 0.5 DEG C/min, 1 DEG C/min, 2 DEG C/min, 5 DEG C/min,
10 DEG C/min, 15 DEG C/min, 20 DEG C/min, 30 DEG C/min, any one in 40 DEG C/min.It is obtained by scanning amount Thermal test
The temperature of the test temperature data T of the reaction of the second power battery electrode material and the experiment heat production power data Q
Degree-power relation curve.
In S24, Mathematical treatment can be carried out using the mathematical feature of the temperature-power relationship curve, described in acquisition
The reactive kinetics parameters value of second power battery electrode material.
The step S24 includes in one of the embodiments,：
S241, peak temperature data and the peak temperature data for obtaining the temperature-power relationship curve are corresponding
Heating rate value；
S242 establishes the reaction kinetics equation of the second power battery electrode material, according to mass-conservation equation, puts
Thermal power calculation formula, the reaction kinetics equation obtain the heat production power calculation of the second power battery electrode material
Formula；
S243, according to the peak temperature data and the corresponding heating rate value of the peak temperature data, according to heat point
Kinetics equation is analysed, the heat production power meter formula calculates the reactive kinetics parameters value；And
S244, according to the reaction kinetics equation, the heat production power meter formula and the reactive kinetics parameters value
Obtain the Thermal degration reaction kinetics model.
It can also include step 240 before step S241, according to the temperature-power relationship curve, obtain described the
The number of the exothermic reaction of two power battery electrode materials.It in one of the embodiments, can be by under a heating rate
The obtained temperature-power relationship curve of scanning amount Thermal test determine the second power battery electrode material thermal decomposition
React number.
In one embodiment, in S243, the reactive kinetics parameters value is calculated by numerical optimization.
In one embodiment, the numerical optimization can be particle group optimizing method, genetic algorithm, least square
Method.
Fig. 2 is referred to, Fig. 2 is the ternary positive electrode active material of the embodiment of the present application acquisition under 20 DEG C/min heating rates
Surface sweeping calorimetric test result.Shown in Fig. 2, you can determine tested ternary positive electrode active material in thermal decomposition process
In, there are three exothermic reactions.
Battery electrode material thermal stability judgment method as claimed in claim 3, in the S242, the reaction power
Learning equation is:
The mass-conservation equation is：
The heat release rating formula is：
Wherein, x represents the reaction of the second power battery electrode material；cxRepresent the second power battery electrode material
The normalization concentration of the reactant of the reaction of material, unit are 1；AxThe forward direction factor of reaction is represented, unit is s-1；Ea,xIt represents anti-
The activation energy answered, unit are Jmol-1；R is ideal gas constant 8.314Jmol-1·K-1, nxFor the series of reaction, unit
It is the temperature that 1, T is the second electrode material；QxRepresent the heat release power of the reaction；M represents the quality of the reactant,
Unit is g；HxRepresent the reaction enthalpy of the reaction x of second electrode material described in the reactive kinetics parameters, unit Jg-1；Ax, Ea,x,nxAnd HxRepresent the reactive kinetics parameters.
The heat production power meter formula is in one of the embodiments,：
Q=Qx_1+Qx_2+Qx_3+… (4)
Wherein, subscript x_1, x_2, x_3 ... represent the reaction of different the second power battery electrode materials.
In step S23, differential scanning calorimeter can be used, multiple heating rates are carried out to the test sample and are swept
Retouch calorimetric test.It is appreciated that the scanning amount Thermal test of 4 groups of difference heating rates can be carried out at least.Preferably, the heating
Sweep speed can be in 0.5 DEG C/min, 1 DEG C/min, 2 DEG C/min, 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, in 20 DEG C/min
It chooses.In the application one embodiment, the scanning amount Thermal test of 4 groups of heating rates is carried out, selected heating rate is 5
DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min, test results are shown in figure 3, and Fig. 3 is described under the conditions of sweep speed
The calorimetric test result of ternary positive electrode active material.
Scanning amount Thermal test according to the heating rate is as a result, obtain different heating rate βiUnder each reaction peak
It is worth temperature Tpi,x.The Thermal Analysis Kinetics equation is in one of the embodiments,：
For reacting x, heating rate βiLower and peak temperature Tpi,xIn the presence of meeting above-mentioned relation formula.
Based on relational expression (5), drawCurve, you can it is anti-to solve the second power battery electrode material
Answer the forward direction factors A in the reaction kinetics equation of xxAnd activation energya,x.In one embodiment, if the peak of partial reaction
It is worth the bad judgement of temperature, partial reaction can be drawnCurve, and then it is preceding to factors A to solve acquisitionxAnd work
Changing can Ea,x。
Fig. 4 is referred to, Fig. 4 is to retouch exothermic reaction x_1 and x_2 in calorimetric resultCurve and fitting
As a result.Wherein βiRepresent heating rate.Tpi,xRepresent peak temperature.The forward direction factor obtained and activation are calculated according to fitting result
It can be as follows：Ax_1=2.4262 × 1013, Ea,x_1=1.6201 × 105, Ax_2=6.5429 × 1013, Ea,x_2=1.7785 ×
105。
In one embodiment, according to the scanning amount Thermal test of more heating rates as a result, and above-described embodiment obtain
The activation energy of the second power battery electrode material part decomposition reaction obtained and the forward direction factor give unknown reaction x's
Reactive kinetics parameters [Ax,Ea,x,nx,Hx] it is used as amount to be asked, simultaneous formula (1)~(4), you can obtain different heatings to calculate
Rate βiUnder the second power battery electrode material heat production power QiWith temperature TiTemperature-power relationship curve.Using described
Numerical optimization so that calculate the temperature-power relationship curve of the heat production power Q and temperature T under more heating rates of acquisition
It is minimum that the error between scanning amount Thermal test curve is obtained with experiment, you can in the hope of the second power battery electrode material heat point
One group of peak optimization reaction kinetic parameter [A of all reaction x in solution preocessx,Ea,x,nx,Hx]。
In one embodiment, the amount under the conditions of 4 groups of different scanning rates has been carried out to the ternary positive electrode active material
Thermal test.4 groups of sweep speeds are { 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min }.Continuing with referring to Fig. 2, described three
For first positive electrode active materials in thermal decomposition process, there are three exothermic reactions, are denoted as x_1, x_2 and x_3.Based on formula (1)~
(4) and in above-described embodiment the partial reaction kinetic parameter having determined, uses least square method so that calculate acquisition
The temperature-power relationship curve of heat production power Q under more heating rates and temperature T and experiment obtain between scanning amount Thermal test curve
Error it is minimum, you can in the hope of one group of peak optimization reaction power of each reaction x of ternary positive electrode active material thermal decomposition
Learn parameter [Ax,Ea,x,nx,Hx] and reaction enthalpy Hx, the one group of optimal parameter obtained is as shown in table 1.
The reactive kinetics parameters of all reactions of electrode material thermal decomposition process in 1 the embodiment of the present application of table
It is substituted into formula (1)~(4) using above-mentioned optimized parameter, you can it is anti-to establish the thermal decomposition by formula (1)~(4)
Answer kinetic model.
Fig. 5 is referred to, Fig. 5 is the result of calculation for the Thermal degration reaction kinetics model established in the embodiment of the present application
With the comparison diagram of experimental result.By Fig. 5 it can be seen that result of calculation is very close with experimental result, illustrate through above-mentioned implementation
It is very accurate that example calculates the reactive kinetics parameters value obtained.Therefore, the thermal decomposition provided by the embodiments of the present application
Reaction Kinetics Model can be with the heat production characteristic during the first power battery electrode material thermal decomposition described in Accurate Prediction, and can
For the thermal stability of qualitative assessment electrode material.
Fig. 6 is referred to, the embodiment of the present application also provides a kind of power battery electrode material thermal stability judgment means, including
Battery electrode material thermal stability judges equipment 11 and computer 12.The computer 12 includes memory 100 and processor
200.Computer program 300 can be stored in the memory 200.The computer program 300 can be on the processor 200
Operation.The processor 200 uses battery electrode material thermal stability judgment method, institute when executing the computer program 300
The method of stating includes：
S10 selects the temperature data of the first power battery electrode material；
S20, it is dynamic according to the pyrolysis of electrode material according to the temperature data of the first power battery electrode material
Mechanical model obtains the heat production power data of the first power battery electrode material；And
S30 judges that the heat of the first power battery electrode material is steady by the heat production power data compared with standard value
It is qualitative.
The embodiment of the present application also provides a kind of computer readable storage medium.It is stored on the computer readable storage medium
Have computer program, the program can be used for when being executed by processor execute the method the step of.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
It is completed by computer program or the relevant hardware of instruction, the program can be stored in a computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, each implementation provided herein
Any reference to memory, storage, database or other media used in example, may each comprise non-volatile and/or easy
The property lost memory.Nonvolatile memory may include read-only memory (ROM), programming ROM (PROM), electrically programmable ROM
(EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include random access memory (RAM)
Or external cache.By way of illustration and not limitation, RAM is available in many forms, such as static state RAM (SRAM),
It is dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhanced SDRAM (ESDRAM), same
Walk link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) directly RAM (RDRAM), direct memory bus
Dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element is referred to as " directly existing " another element "upper",
There is no intermediary elements.Term as used herein " vertically ", " horizontal ", "left", "right" and similar statement are
For illustrative purposes.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the application the scope of the claims therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, under the premise of not departing from the application design, various modifications and improvements can be made, these belong to the guarantor of the application
Protect range.Therefore, the protection domain of the application patent should be determined by the appended claims.
Claims (10)
1. a kind of power battery electrode material thermal stability judgment method, which is characterized in that including：
S10 selects the temperature data of the first power battery electrode material；
S20, according to the temperature data of the first power battery electrode material, according to the Thermal degration reaction kinetics of electrode material
Model obtains the heat production power data of the first power battery electrode material；And
S30 judges the thermostabilization of the first power battery electrode material by the heat production power data compared with standard value
Property.
2. power battery electrode material thermal stability judgment method as described in claim 1, which is characterized in that in the S20,
The method for building up of the Thermal degration reaction kinetics model includes：
S21 provides one second power battery, and carries out battery charging and discharging processing to second power battery；
S22, dismantling charge and discharge treated second power battery, to obtain the second power battery electrode material；
S23 chooses heating rate value, according to the heating rate value to the second power battery electrode material amount of being scanned
Thermal test obtains the temperature of the test temperature data and experiment heat production power data of the reaction of the second power battery electrode material
Degree-power relation curve；And
S24 calculates the reactive kinetics parameters of the second power battery electrode material according to the temperature-power relationship curve
Value obtains the Thermal degration reaction kinetics model according to the reactive kinetics parameters value.
3. power battery electrode material thermal stability judgment method as claimed in claim 2, which is characterized in that the S24 packets
It includes：
S241 obtains peak temperature data and the corresponding heating of the peak temperature data of the temperature-power relationship curve
Rate value；
S242 establishes the reaction kinetics equation of the second power battery electrode material, according to mass-conservation equation, heat release work(
Rate calculation formula, the reaction kinetics equation obtain the heat production power meter formula of the second power battery electrode material；
S243, it is dynamic according to heat analysis according to the peak temperature data and the corresponding heating rate value of the peak temperature data
Mechanical equation, the heat production power meter formula calculate the reactive kinetics parameters value；And
S244 is obtained according to the reaction kinetics equation, the heat production power meter formula and the reactive kinetics parameters value
The Thermal degration reaction kinetics model.
4. power battery electrode material thermal stability judgment method as claimed in claim 3, which is characterized in that the S242
In, the reaction kinetics equation is:
The mass-conservation equation is：
The heat release rating formula is：
Wherein, x represents the reaction of the second power battery electrode material；cxRepresent the second power battery electrode material
The normalization concentration of the reactant of reaction, unit are 1；AxThe forward direction factor of reaction is represented, unit is s-1；Ea,xRepresent reaction
Activation energy, unit are Jmol-1；R is ideal gas constant 8.314Jmol-1·K-1, nxFor the series of reaction, unit is 1,
T is the temperature of the second electrode material；QxRepresent the heat release power of the reaction；M represents the quality of the reactant, unit
It is g；HxRepresent the reaction enthalpy of the reaction x of second electrode material described in the reactive kinetics parameters, unit Jg-1；Ax,
Ea,x,nxAnd HxRepresent the reactive kinetics parameters.
5. power battery electrode material thermal stability judgment method as claimed in claim 4, which is characterized in that the heat production work(
Rate calculating formula is：
Q=Qx_1+Qx_2+Qx_3+… (4)
Wherein, subscript x_1, x_2, x_3 ... represent the reaction of the different second electrode materials.
6. power battery electrode material thermal stability judgment method as claimed in claim 5, which is characterized in that the heat analysis
Kinetics equation is：
Wherein, βiRepresent the heating rate value, Tpi,xRepresent the peak temperature data.
7. power battery electrode material thermal stability judgment method as claimed in claim 3, which is characterized in that in the S241
Before, further include：
S240 obtains of the exothermic reaction of the second power battery electrode material according to the temperature-power relationship curve
Number.
8. power battery electrode material thermal stability judgment method as claimed in claim 3, which is characterized in that the S243
In, the reactive kinetics parameters value is calculated by numerical optimization.
9. a kind of power battery electrode material thermal stability judgment means, including the judgement of power battery electrode material thermal stability are set
Standby (11) and computer (12), Computer (12) include memory (100), processor (200) and are stored in memory
(200) on and the computer program (300) that can be run on processor (200), which is characterized in that the processor (200) is held
Power battery electrode material thermal stability judgment method is used when row computer program (300), the method includes：
S10 selects the temperature data of the first power battery electrode material；
S20, according to the temperature data of the first power battery electrode material, according to the Thermal degration reaction kinetics of electrode material
Model obtains the heat production power data of the first power battery electrode material；And
S30 judges the thermostabilization of the first power battery electrode material by the heat production power data compared with standard value
Property.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
It can be used for the step of perform claim requires any one of 1-8 the methods when execution.
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