CN110376243A - A kind of test method of square power battery specific heat capacity and pole piece normal direction thermal conductivity - Google Patents
A kind of test method of square power battery specific heat capacity and pole piece normal direction thermal conductivity Download PDFInfo
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Abstract
The present invention relates to the test methods of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity, comprising: step S1: establishing the square power battery specific heat capacity and pole piece normal direction thermal conductivity mathematical model；Step S2: the heat waste of the square power battery is demarcated；Step S3: the specific heat capacity and pole piece normal direction thermal conductivity of the square power battery are tested.Compared with prior art, the present invention has many advantages, such as that precision is high, at low cost, high-efficient.
Description
Technical field
The present invention relates to the test methods of a kind of specific heat capacity and pole piece normal direction thermal conductivity, more particularly, to a kind of rectangular power
The test method of battery specific heat capacity and pole piece normal direction thermal conductivity.
Background technique
The thermal physical property parameters such as specific heat capacity of lithium ion battery of being familiar with and thermal conductivity are to its heterogeneity phantom of control and reduce thermal runaway
Rate is of great significance.The specific heat capacity and thermal conductivity of lithium ion battery are respectively predictive of battery storage heat and Temperature Distribution of washing
Ability, research is expanded to it there are many experts and scholars at present.
Application publication number is that the patent of invention of CN 108732204A discloses a kind of specific heat capacity test method of power battery
With device.This method is based on law of conservation of energy using rectangular hard shell ferrous phosphate lithium battery as research object, by approximate exhausted
Certain heat is inputted to calculate its specific heat capacity to battery in thermal environment.The test process considers the influence of heat waste, is established
Battery specific heat capacity mathematics computing model computational accuracy with higher.This method is only capable of the specific heat of test rectangular lithium ion battery
Hold, cell thermal conductivity can not be measured, using more limiting to.
Chinese patent 201410847949.5 discloses a kind of measuring method of specific heat capacity of lithium ion battery.This method will be to
It surveys battery and is placed in and accelerate in adiabatic calorimetry instrument test chamber, battery is then heated using heater.Accelerating calorimeter in test process
Energy compensating is carried out to test chamber automatically according to the temperature change of battery surface, holding chamber temperature is consistent with battery surface temperature.It should
Test method equalized temperature is slower, and test period is longer and testing cost is higher.In addition, because cell thermal conductivity is lower, by
Internal and external temperature can be caused uneven in thermal process, influence measuring accuracy；And this method is only capable of the specific heat capacity of test battery, and it can not
Test cell thermal conductivity.
In addition to two patents mentioned above, application publication number is that the patent of invention of CN 109613055A discloses one kind
The stable state measuring method and measurement device of cylindrical battery radial direction thermal coefficient, application publication number are that the invention of CN108170914A is special
Benefit discloses a kind of acquiring method in situ of cylinder takeup type lithium-ion-power cell thermal physical property parameter.This two patents only can be used
In thermal conductivity and the specific heat capacity measuring and calculating for solving the problems, such as cylindrical battery, it is not used to the specific heat capacity and heat of measuring and calculating square power battery
Conductance.
Summary of the invention
The purpose of the present invention is provide a kind of square power battery specific heat capacity and pole piece method to overcome above-mentioned technological deficiency
To the test method of thermal conductivity.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of test method of square power battery specific heat capacity and pole piece normal direction thermal conductivity, comprising:
Step S1: the square power battery specific heat capacity and pole piece normal direction thermal conductivity mathematical model under adiabatic environment are established；
Step S2: it records the square power battery temperature and changes with time, demarcate the heat of the square power battery
Damage；
Step S3: theoretical model in the step S1 is optimized according to the result of the step S2, is obtained nonadiabatic
The specific heat capacity of the square power battery and pole piece normal direction thermal conductivity under environment.
The step S1 specifically:
Step S101: regarding the square power battery as homogeneous entity, pole piece normal direction lateral surface thermally equivalent (heating surface),
Another lateral surface of pole piece normal direction (plane of symmetry) is insulation face, and heat transfer process is one-dimensional heat conduction；
Step S102: ignoring the influence of tab, has q by law of conservation of energyLAL=c ρ LALDT/dt, it can thus be concluded that described
The specific heat capacity expression formula of square power battery:
Wherein, ρ is the density of the square power battery, and c is the specific heat capacity of the square power battery, and L is the side
The pole piece normal thickness of shape power battery, ALFor the square power battery pole piece normal direction cross-sectional area, qLFor the rectangular power
The heating surface heat flow density of battery, dT/dt are the warm variability of the square power battery；
Step S103: according to step S102, a small thickness dx is taken at certain x on hot-fluid propagation path, in very short time
In dt, then there is [q (x)-q (x-dx)] A according to law of conservation of energyxDt=c ρ dxAxdTx, obtain dq/dx=c ρ dTx/ dt works as institute
State q (x)=(q when square power battery temperature field reaches quasi-steady stateL/L)x；
Step S104: q (x)=- λ is had according to Fourier's theroremxDT/dx transplants to it and to expression formula q in step S103
(x)=(qL/ L) x in hot-fluid propagation path x (0≤x≤L) upper integral, can obtain following expression:
Wherein, λxFor the pole piece normal direction thermal conductivity of the square power battery, TLFor the heating surface of the square power battery
Temperature, TOFor the plane of symmetry temperature of the square power battery.
The step S2 specifically:
Step S201: the square power battery is statically placed in the environment of near adiabatic, if its initial temperature and environment
Temperature is Ti；
Step S202: the square power battery is heated to preset temperature Tm, temperature-fall period is recorded after stopping heating；
Step S203: it is fitted " cooling-equation of time " T of the square power batterydrop(t)；
Step S204: to Tdrop(t) first derivative is sought, dT is obtaineddrop/ dt, i.e., the detemperature rate of the described square power battery, note
For Udrop；
Step S205: the temperature difference described in temperature-fall period between square power battery temperature T and initial temperature Ti, Δ are calculated
Tdrop=T-Ti；
Step S206: fitting detemperature rate UdropWith Δ TdropEquation Udrop(ΔTdrop), i.e., " detemperature rate-temperature difference equation "；
Step S207: the heat waste c ρ LA of the square power battery is acquired according to law of conservation of energyLUdrop(ΔTdrop)。
The step S3 specifically:
Step S301: initial temperature and the environment temperature of the square power battery are set as Ti；
Step S302: the heating surface of the square power battery is evenly heated with constant heat flow；
Step S303: the heating surface temperature T of the square power battery is recordedLWith plane of symmetry temperature TO；
Step S304: when the bulk temperature of the square power battery rises to preset temperature TmWhen, stop heating；
Step S305: the temperature difference between the heating surface of the square power battery and plane of symmetry temperature and initial temperature is calculated
TL=TL–TiWith Δ TO=TO–Ti；
Step S306: by Δ TLWith Δ TOSubstitute into " the detemperature rate-temperature difference equation U in step S206drop(ΔTdrop) " acquire
The detemperature rate U of the square power battery its heating surface and the plane of symmetry in thermal historiesdrop(ΔTL) and Udrop(ΔTO)；
Step S307: it is fitted U respectivelydrop(ΔTL) and Udrop(ΔTO) with the functional equation of time, obtain UL-drop(t) and
UO-drop(t)；
Step S308: due to there are heat waste, the ideal temperature of the square power battery shown in expression formula in step S102
Temperature variability dT/dt will receive the temperature drop rate U as caused by heat waste when field reaches quasi-steady statedrop(t) influence, thus it is described rectangular dynamic
Specific heat capacity expression formula of the power battery in actual environment is writeable are as follows:
Wherein, UdropIt (t) is temperature drop rate caused by heat waste；
Step S309: respectively to equation UL-drop(t) and UO-drop(t) in 0~t' time upper integral, the rectangular power is obtained
Battery heating surface and the plane of symmetry temperature drop amplitude as caused by heat waste in heated phase, Δ TL-drop=∫ t'UL-drop(t)dt
With Δ TO-drop=∫ t'UO-drop(t)dt；
Step S310: due to the influence of heat waste, the square power battery temperature field shown in step S103 expression formula
The heating surface temperature T when reaching quasi-steady stateLWith plane of symmetry temperature TOIt will receive the temperature drop amplitude as caused by heat waste in step S308
It influences, then pole piece normal direction thermal conductivity expression formula of the square power battery in actual environment are as follows:
Wherein, Δ TL-dropWith Δ TO-dropThe respectively described square power battery heating surface and the plane of symmetry are in heated phase
The temperature drop amplitude as caused by heat waste.
Preferably, the near adiabatic environment is provided by vacuum tank or thermal insulation material.
Preferably, the initial temperature and environment temperature of the square power battery can be provided by insulating box.
Preferably, it is arranged symmetrically using two pieces of identical square power batteries.
Preferably, the square power battery heating surface is heated by the uniform constant heat flow of thin film heater, and heater thickness is not
Higher than 0.25mm, quality is lower than the 3% of the square power battery gross mass, and heating surface completely covers the square power battery
Heating surface.
Preferably, the square power battery heating surface temperature is evenly arranged by the thermocouple by quantity not less than two
It is measured in the face, or its temperature is monitored using thermal infrared imager；Plane of symmetry temperature is by arranging one in plane of symmetry center
Thermocouple measures.
The preset upper limit temperature T of the square power batterymLower than the safe working temperature of the square power battery；Stop
After only heating, it is preferred that the square power battery temperature is decreased below TiStop test at+4 DEG C.
Preferably, when heating the square power battery in the step S302 with constant heat flow between heating surface and the plane of symmetry
The temperature difference is within the scope of 5~25 DEG C.
Preferably, the heated duration t' of square power battery described in step S309 is not less than 60s.
Compared with prior art, the invention has the following advantages:
1. at low cost: the present invention wraps up battery using cheap thermal insulation material when testing, and is then added using film
Hot device heats battery, and compared to the previous thermal physical property parameter using the equipment such as accelerating calorimeter test battery, this method is had more
Cost advantage.
2. precision is high: square power battery specific heat capacity established by the present invention and pole piece normal direction thermal conductivity theoretical calculation model
The influence for considering heat waste, compared to the previous specific heat capacity for calculating square power battery based on mathematical model ideally
And thermal conductivity, improve measuring accuracy.
3. high-efficient: the present invention can calculate the specific heat capacity and pole piece normal direction thermal conductivity of square power battery simultaneously, compared to
The previous specific heat capacity for being only capable of test square power battery and be unable to test thermal conductivity, or need to test twice just can measure it is rectangular
Specific heat capacity and thermal conductivity of power battery etc., the present invention improves testing efficiency.
Detailed description of the invention
Fig. 1 is measuring and calculating flow chart of the invention；
Fig. 2 is the two-dimensional structure schematic diagram of square power battery in the present invention；
Fig. 3 is temperature lowering curve figure of the square power battery near adiabatic environment in heat waste calibration process of the present invention；
Fig. 4 is temperature rise figure when square power battery is heated under near adiabatic environment in the present invention；
Fig. 5 is the curve graph that square power battery specific heat capacity of the present invention varies with temperature；
Fig. 6 is the curve graph that shape pole piece of power battery normal direction thermal conductivity of the present invention varies with temperature.
Appended drawing reference:
The 1- plane of symmetry；2- thermocouple；3- inner core；4- shell；5- heating surface；6- thin film heater；TC- thermocouple measuring point；
TavgSquare power battery mean temperature；T0Insulating box furnace temperature.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
As shown in Figure 1, the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity, comprising:
Step S1: square power battery specific heat capacity and pole piece normal direction thermal conductivity mathematical model under adiabatic environment are established；
Step S2: record square power battery temperature changes with time, and demarcates the heat waste of square power battery；
Step S3: optimizing theoretical model in step S1 according to the result of step S2, obtains below nonadiabatic environment
The specific heat capacity and pole piece normal direction thermal conductivity of shape power battery.
Square power battery is automobile-used Soft Roll ferrous phosphate lithium dynamical battery, 11 × 79 × 130mm of size3, quality 235g,
Nominal capacity 9.0Ah, enclosure material are aluminum plastic film.Battery first is coated using with a thickness of the aerogel blanket of 20mm, is then hanged
It hangs in having a size of 220 × 210 × 160mm3Acrylic vacuum tank center, air pressure is evacuated to by -90kPa using vacuum pump；
As shown in Fig. 2, square power battery arranges a thermocouple at its heating surface center, then by another thermoelectricity
Occasionally it is arranged on the face diagonal at upper right angular distance battery top 40mm；Same one piece of battery is taken, a thermocouple is arranged in
At heating surface center, by another thermocouple be arranged on heated face diagonal the lower left corner away from low side 40mm at；Finally by two pieces
The plane of symmetry of battery is snugly into each other, and a thermocouple is arranged at plane of symmetry center.The external Agilent data acquisition of thermocouple
Instrument reads measuring point temperature by the equipment.
The initial temperature of square power battery and required environment temperature are provided by insulating box, and square power battery is adopted before testing
Square power battery SOC to be measured is adjusted to 50% with charge-discharge test instrument.
Voltage needed for heater is provided by precision for the regulated power supply of 0.01V0.001A.
Used thin film heater is influenced by temperature and voltage not higher than 1.2% with a thickness of 0.25mm, heating power；
Ignore the influence of square power battery tab to be measured in test process, square power battery is accordingly to be regarded as homogeneous entity.
Conduction process in test process inside square power battery is one-dimensional heat conduction in pole piece normal direction.
The maximum temperature rise of default square power battery is not higher than 80 DEG C, ignores square power battery from heat release.
Step S1 specifically:
Step S101: regarding square power battery as homogeneous entity, pole piece normal direction lateral surface thermally equivalent (heating surface), pole piece
Another lateral surface of normal direction (plane of symmetry) is insulation face, and heat transfer process is one-dimensional heat conduction；
Step S102: ignoring the influence of tab, has q by law of conservation of energyLAL=c ρ LALDT/dt, it can thus be concluded that rectangular
The specific heat capacity expression formula of power battery:
Wherein, ρ is the density of square power battery, and c is the specific heat capacity of square power battery, and L is square power battery
Pole piece normal thickness, ALFor the pole piece normal direction cross-sectional area of square power battery, qLIt is close for the heating surface hot-fluid of square power battery
Degree, dT/dt are the warm variability of square power battery；
Step S103: according to step S102, a small thickness dx is taken at certain x on hot-fluid propagation path, in very short time
In dt, then there is [q (x)-q (x-dx)] A according to law of conservation of energyxDt=c ρ dxAxdTx, obtain dq/dx=c ρ dTx/ dt, the side of working as
Q (x)=(q when shape temperature of powered cell field reaches quasi-steady stateL/L)x；
Step S104: q (x)=- λ is had according to Fourier's theroremxDT/dx transplants to it and to expression formula q in step S103
(x)=(qL/ L) x in hot-fluid propagation path x (0≤x≤L) upper integral, can obtain following expression:
Wherein, λxFor the pole piece normal direction thermal conductivity of square power battery, TLFor the heating surface temperature of square power battery, TO
For the heating surface temperature of square power battery.
Step S2 specifically:
Step S201: square power battery is statically placed in the environment of near adiabatic, if its initial temperature and furnace temperature are 10
℃；
Step S202: for heater with 17.3W invariable power heating square power battery to 40 DEG C, stopping will be square after heating
Time when shape temperature of powered cell is down to 28 DEG C is denoted as at 0 point, stops experiment, knot when square power battery temperature is down to 13 DEG C
Fruit is as shown in Figure 3；
Step S203: " cooling-equation of time " of square power battery, T are fitteddrop(t):
Tdrop(t)=- 8.99 × 10-12t3+2.40×10-7t2-3.06×10-3t+18.3；
Step S204: to Tdrop(t) first derivative is sought, dT is obtaineddrop/ dt, i.e. square power battery detemperature rate, are denoted as Udrop:
Udrop=-2.679 × 10-11t2+4.8×10-7t-3.06×10-3；
Step S205: the temperature difference in temperature-fall period between square power battery temperature T and initial temperature Ti, Δ T are calculateddrop=
T–Ti；
Step S206: fitting detemperature rate UdropWith Δ TdropEquation Udrop(ΔTdrop), i.e., " detemperature rate-temperature difference equation ":
Udrop(ΔTdrop)=- 1.64 × 10-4ΔTdrop-6.8×10-5；
Step S207: square power battery heat waste c ρ LA is acquired according to law of conservation of energyLUdrop(ΔTdrop)。
Step S3 specifically:
Step S301: square power battery initial temperature and furnace temperature are set as 10 DEG C；
Step S302: as shown in figure 4, heater heats square power battery with 17.3W invariable power, its maximum temperature is caused
Degree is close to 30 DEG C；
Step S303: record square power battery heating surface temperature TLWith plane of symmetry temperature TO；
Step S304: when square power battery bulk temperature rises to preset temperature TmWhen, stop heating；
Step S305: the temperature difference T between square power battery heating surface and plane of symmetry temperature and initial temperature is calculatedL=TL–
TiWith Δ TO=TO–Ti；
Step S306: by Δ TLWith Δ TOSubstitute into " the detemperature rate-temperature difference equation U in step S206drop(ΔTdrop) " acquire
The detemperature rate U of square power battery its heating surface and the plane of symmetry in thermal historiesdrop(ΔTL) and Udrop(ΔTO)；
Step S307: it is fitted U respectivelydrop(ΔTL) and Udrop(ΔTO) with the functional equation of time, obtain UL-drop(t) and
UO-drop(t)；
Step S308: since there are heat waste, the ideal temperature field of square power battery shown in expression formula reaches in step S102
It will receive the temperature drop rate U as caused by heat waste to temperature variability dT/dt when quasi-steady statedrop(t) influence, therefore square power battery exists
Specific heat capacity expression formula in actual environment is writeable are as follows:
Wherein, UdropIt (t) is temperature drop rate caused by heat waste；The specific heat capacity calculated under the operating condition is denoted as average operation temperature
Test value under 20 DEG C of degree (initial temperature and the average value for stopping maximum temperature when heating)；
Step S309: respectively to equation UL-drop(t) and UO-drop(t) in 0~t' time upper integral, square power battery is obtained
Interior lateral surface temperature drop amplitude as caused by heat waste in heated phase, Δ TL-drop=∫t'UL-drop(t) dt and Δ TO-drop=∫t'
UO-drop(t)dt；
Step S310: due to the influence of heat waste, square power battery temperature field shown in step S103 expression formula is reaching
To heating surface temperature T when quasi-steady stateLWith plane of symmetry temperature TOIt will receive the shadow of the temperature drop amplitude as caused by heat waste in step S309
It rings, then pole piece normal direction thermal conductivity expression formula of the square power battery in actual environment are as follows:
Wherein, Δ TL-dropWith Δ TO-dropRespectively square power battery heating surface and the plane of symmetry are in heated phase by heat
Temperature drop amplitude caused by damaging；The pole piece normal direction thermal conductivity calculated under the operating condition is denoted as 20 DEG C of average operating temperature (initial temperature
Degree with stop heat when maximum temperature average value) under test value.
According to above-mentioned testing procedure, the side at a temperature of -20 DEG C, 0 DEG C, 40 DEG C and 60 DEG C can be calculated when changing measurement condition
Shape power battery specific heat capacity and pole piece normal direction thermal conductivity, results of measuring is as shown in Figure 5 and Figure 6, while test knot is labelled in figure
The deviation of measuring and calculating value when the measuring and calculating value at beam moment has just reached quasi-steady state relative to temperature field.The rectangular power known to Fig. 5 and Fig. 6
The specific heat capacity and thermal conductivity of battery increase with temperature and are increased, and specific heat capacity is influenced by temperature degree greater than thermal conductivity.
Claims (10)
1. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity characterized by comprising
Step S1: the square power battery specific heat capacity and pole piece normal direction thermal conductivity mathematical model under adiabatic environment are established；
Step S2: it records the square power battery temperature and changes with time, demarcate the heat waste of the square power battery；
Step S3: theoretical model in the step S1 is optimized according to the result of the step S2, obtains nonadiabatic environment
Under the square power battery specific heat capacity and pole piece normal direction thermal conductivity.
2. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 1,
It is characterized in that, the step S1 specifically:
Step S101: regarding the square power battery as homogeneous entity, pole piece normal direction lateral surface thermally equivalent (heating surface), pole piece
Another lateral surface of normal direction (plane of symmetry) is insulation face, and heat transfer process is one-dimensional heat conduction；
Step S102: ignoring the influence of tab, has q by law of conservation of energyLAL=c ρ LALDT/dt, it can thus be concluded that described rectangular
The specific heat capacity expression formula of power battery:
Wherein, ρ is the density of the square power battery, and c is the specific heat capacity of the square power battery, and L is described rectangular dynamic
The pole piece normal thickness of power battery, ALFor the pole piece normal direction cross-sectional area of the square power battery, qLFor the rectangular power electric
The heating surface heat flow density in pond, dT/dt are the warm variability of the square power battery；
Step S103: according to step S102, taking a small thickness dx on hot-fluid propagation path at certain x, in very short time dt,
Then there is [q (x)-q (x-dx)] A according to law of conservation of energyxDt=c ρ dxAxdTx, obtain dq/dx=c ρ dTx/ dt, when described rectangular
Q (x)=(q when temperature of powered cell field reaches quasi-steady stateL/L)x；
Step S104: q (x)=- λ is had according to Fourier's theroremxDT/dx, transplant to it and to expression formula q (x) in step S103=
(qL/ L) x in hot-fluid propagation path x (0≤x≤L) upper integral, can obtain following expression:
Wherein, λxFor the pole piece normal direction thermal conductivity of the square power battery, TLFor the heating surface temperature of the square power battery
Degree, TOFor the plane of symmetry temperature of the square power battery.
3. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 1,
It is characterized in that, the step S2 specifically:
Step S201: the square power battery is statically placed in the environment of near adiabatic, if its initial temperature and environment temperature
For Ti；
Step S202: the square power battery is heated to preset temperature Tm, temperature-fall period is recorded after stopping heating；
Step S203: " cooling-equation of time " of the square power battery, T are fitteddrop(t)；
Step S204: to Tdrop(t) first derivative is sought, dT is obtaineddrop/ dt, i.e., the detemperature rate of the described square power battery, is denoted as
Udrop；
Step S205: the temperature difference described in temperature-fall period between square power battery temperature T and initial temperature Ti, Δ T are calculateddrop=
T–Ti；
Step S206: fitting detemperature rate UdropWith Δ TdropEquation Udrop(ΔTdrop), i.e., " detemperature rate-temperature difference equation "；
Step S207: the heat waste c ρ LA of the square power battery is acquired according to law of conservation of energyLUdrop(ΔTdrop)。
4. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 1,
It is characterized in that, the step S3 specifically:
Step S301: initial temperature and the environment temperature of the square power battery are set as Ti；
Step S302: the heating surface of the square power battery is evenly heated with constant heat flow；
Step S303: the heating surface temperature T of the square power battery is recordedLWith plane of symmetry temperature TO；
Step S304: when the bulk temperature of the square power battery rises to preset temperature TmWhen, stop heating；
Step S305: the temperature difference T between the heating surface of the square power battery and plane of symmetry temperature and initial temperature is calculatedL=
TL–TiWith Δ TO=TO–Ti；
Step S306: by Δ TLWith Δ TOSubstitute into " the detemperature rate-temperature difference equation U in step S206drop(ΔTdrop) " acquire it is described
The detemperature rate U of square power battery its heating surface and the plane of symmetry in thermal historiesdrop(ΔTL) and Udrop(ΔTO)；
Step S307: it is fitted U respectivelydrop(ΔTL) and Udrop(ΔTO) with the functional equation of time, obtain UL-drop(t) and UO-drop
(t)；
Step S308: since there are heat waste, the ideal temperature field of the square power battery shown in expression formula reaches in step S102
It will receive the temperature drop rate U as caused by heat waste to temperature variability dT/dt when quasi-steady statedrop(t) influence, therefore the rectangular power electric
Specific heat capacity expression formula of the pond in actual environment is writeable are as follows:
Wherein, UdropIt (t) is temperature drop rate caused by heat waste；
Step S309: respectively to equation UL-drop(t) and UO-drop(t) in 0~t' time upper integral, the square power battery is obtained
Heating surface and the plane of symmetry temperature drop amplitude as caused by heat waste in heated phase, Δ TL-drop=∫ t'UL-drop(t) dt and Δ
TO-drop=∫ t'UO-drop(t)dt；
Step S310: due to the influence of heat waste, the square power battery temperature field shown in step S103 expression formula is reaching
To heating surface temperature T when quasi-steady stateLWith plane of symmetry temperature TOIt will receive the shadow of the temperature drop amplitude as caused by heat waste in step S309
It rings, then pole piece normal direction thermal conductivity expression formula of the square power battery in actual environment are as follows:
Wherein, Δ TL-dropWith Δ TO-dropThe respectively described square power battery heating surface and the plane of symmetry are in heated phase by heat
Temperature drop amplitude caused by damaging.
5. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 3 or 4,
It is characterized in that, the near adiabatic environment is provided by vacuum tank or thermal insulation material, the initial temperature of the square power battery
It can be provided by insulating box with environment temperature, while be arranged symmetrically using two pieces of identical batteries.
6. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 3 or 4,
It is characterized in that, the square power battery heating surface is heated by the uniform constant heat flow of thin film heater, heater thickness is not higher than
0.25mm, quality are lower than the 3% of battery gross mass, and heating surface completely covers battery heating surface.
7. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 3 or 4,
It is characterized in that, the square power battery heating surface temperature is evenly arranged in this by the thermocouple by quantity not less than two
Face monitors its temperature to measure, or using thermal infrared imager；The plane of symmetry temperature is by arranging one in plane of symmetry center
Thermocouple measures.
8. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 3 or 4,
It is characterized in that, the preset upper limit temperature T of the square power batterymLower than the trouble free service temperature of the square power battery
Degree；After stopping heating, the square power battery temperature is decreased below TiStop test at+4 DEG C.
9. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 4,
It is characterized in that, temperature difference when heating the square power battery in the step S302 with constant heat flow between heating surface and the plane of symmetry exists
Within the scope of 5~25 DEG C.
10. the test method of a kind of square power battery specific heat capacity and pole piece normal direction thermal conductivity according to claim 4,
It is characterized in that, the heated duration t' of square power battery described in step S309 is not less than 60s.
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| CN114113200A (en) * | 2021-09-28 | 2022-03-01 | 北京交通大学 | Lithium ion battery specific heat capacity test method based on heat flow density measurement |
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| CN114113200B (en) * | 2021-09-28 | 2024-01-23 | 北京交通大学 | Lithium ion battery specific heat capacity testing method based on heat flux density measurement |
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Application publication date: 20191025 |