CN108896930A - A method of lithium battery temperature rise situation is assessed using total yield thermal power general formula - Google Patents
A method of lithium battery temperature rise situation is assessed using total yield thermal power general formula Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 131
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Abstract
The invention discloses a kind of calculation methods of lithium ion battery total yield thermal power general formula, and according to above-mentioned total yield thermal power general formula, in conjunction with the method for simulation software assessment lithium ion battery temperature rise situation, pass through the total yield thermal power and DC internal resistance of lithium battery, in conjunction with Bernardi empirical equation, it obtains the total yield thermal power general formula of lithium battery, then based on gained total yield thermal power general formula, temperature rise situation of the lithium battery in charge and discharge process is quickly calculated using emulation mode.Appraisal procedure provided in the present invention is based on conventional charge and discharge system, and operation is simple；It is able to reflect the temperature rise situation of charging and discharging lithium battery, accuracy is high；The temperature rise situation of charging and discharging lithium battery can quickly be calculated, it is high-efficient；Do not have to test the lithium battery under every kind of operating condition in actual use, there is wide applicability in engineering.
Description
Technical field
The invention belongs to lithium ion battery testing fields, and in particular to a kind of to assess lithium battery using total yield thermal power general formula
The method of temperature rise situation.
Background technique
Lithium battery, since internal driving and chemical reaction can constantly generate heat, produces in normal charge and discharge process
Raw heat a part promotes the temperature of battery itself, and another part is lost in air.Temperature rise, which is able to reflect lithium battery, to be made
With behavior pattern in the process, therefore, battery user more pays close attention to the temperature rise situation of battery.Temperature rise monitoring traditional at present
Method is to judge that the temperature rise situation of battery, measurement surface temperature cannot be accurately anti-by the temperature on experiment measurement lithium battery surface
Mirror the actual state of inside battery, the temperature rise data of inside battery cannot be accurately provided so that the temperature rise situation obtained with
Battery actual conditions difference is larger；Experiment condition is different in experimental test procedures simultaneously, and the temperature rise situation consistency obtained is poor,
The actual use situation that not can accurately reflect lithium battery, the temperature rise situation provided according to the method described above can generate battery user
Certain misleading prevents battery user from the temperature rise situation of accurate judgement battery, and then makes battery user to lithium battery
Safe handling cannot be accurately held.
During measuring lithium battery temperature rise, adiabatic condition is a kind of perfect condition, indicates test ambient boundary without heat
Amount entrance with disperse, under adiabatic conditions carry out lithium battery temperature rise test, have preferable accuracy, be able to reflect lithium battery
The actual conditions of inside battery in use process.At present to lithium battery carry out adiabatic temperature rise test be ARC test, ARC test
As a result accurate, it is with good stability, accurate temperature rise reference can be provided for battery user.But ARC test at present is deposited
In the problem that test equipment is expensive and testing expense is high, if every money battery all carries out ARC test in battery R&D process, need
Take a substantial amount of time cost and expense cost；On the other hand, ARC test has centainly professional, to the behaviour of tester
Make that skill requirement is higher, the insufficient operator of professional skill is difficult to stablizing test error into the range in permission, or even is surveying
Will appear operation error during examination leads to the problem of result mistake.ARC test does not provide the unified meter of battery heat production power
Formula is calculated, requires to be tested under every kind of operating condition, so that ARC test is faced with very big choose in terms of timeliness and cost
War.Therefore, in the present circumstance, ARC test does not have the applicability of R&D process.
Develop a kind of method that lithium battery temperature rise situation can be tested under conventional laboratory conditions, for battery design and
Using all having important meaning.The mathematical model that reaction cell temperature rise situation is established by experimental data, then to battery
Temperature rise situation is assessed, and is the common technological means of developer.It is such as entitled application No. is 201510547525.1《A kind of lithium from
Sub- internal temperature of battery monitoring method》Chinese invention patent, disclose a kind of monitoring method of internal temperature of lithium ion battery,
Specific method is：Step（1）, obtain battery surface temperature variation curve；Step（2）, establish the lithium based on variable rate of heat production
Battery electro thermal coupling model；Step（3）, battery discharge procedure temperature rise variation is emulated；Step（4）, pass through observed temperature
Change curve and simulation curve are compared, and are optimized, are verified electro thermal coupling model；Step（5）, analyze inside battery and surface temperature
The influence of degree, discharge current and depth of discharge constructs internal temperature of battery model；Step（6）, according to step（5）In mould
Type carries out implementation monitoring to internal temperature of battery.This method estimation error is small, and it is right in production and use process to better meet
The demand of internal temperature of battery real-time monitoring.It is entitled application No. is 201711057755.5《A kind of lithium ion battery heat analysis side
Method》Chinese invention patent, disclose a kind of lithium ion battery heat analysis method, specific method is：Step（1）, to battery core into
Row HPPC electric performance test；Step（2）, battery core equivalent-circuit model is built, the heating power MAP chart of battery core is drawn；Step
（3）, obtain battery and simulate temperature rise curve；Step（4）, charge-discharge test is carried out to battery core, obtains practical temperature rise curve；Step
（5）, then comparative simulation temperature rise curve and practical temperature rise curve, amendment battery core equivalent-circuit model carry out lithium ion battery
Charge and discharge electrothermal analysis.This method passes through the foundation and amendment of model, improves precision of analysis, fills for lithium ion battery
The heat analysis of discharge process.
Developer has done a large amount of work to the temperature rise of lithium battery assessment, it was also proposed that some to be suitable for assessment lithium battery
The method of temperature rise situation, but there is also test method complexity the problem of higher cost, further seeks that result is accurate, behaviour
Make that simple, cost is relatively low, and the wide lithium battery temperature rise appraisal procedure of applicability have to the design and use of lithium battery it is positive
Directive significance.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of lithium ion battery total yield thermal power general formulas
Calculation method, and according to above-mentioned total yield thermal power general formula, in conjunction with the method for simulation software assessment lithium ion battery temperature rise situation,
The total yield thermal power of lithium battery is obtained in conjunction with Bernardi empirical equation by the total yield thermal power and DC internal resistance of lithium battery
General formula quickly calculates the temperature rise situation of lithium battery using emulation mode then based on gained total yield thermal power general formula.This hair
The appraisal procedure of bright middle offer is based on conventional charge and discharge system, and operation is simple；It is able to reflect charging and discharging lithium battery
Temperature rise situation, accuracy is high；Temperature rise situation of the lithium battery in charge and discharge process can quickly be calculated, it is high-efficient；?
Do not have to test the lithium battery under every kind of operating condition in actual use, there is wide applicability in engineering.
Present invention technical effect to be achieved is realized by following scheme：
The present invention provides a kind of calculation methods of lithium ion battery total yield thermal power general formula, include the following steps：
Step 1：Lithium ion battery to be measured is subjected to constant-current charge or constant-current discharge, is then allowed to stand, measure the constant-current charge or
The temperature of the lithium ion battery surface to be measured during constant-current discharge process and the standing；
Step 2：The average heat production power during the constant-current charge or constant-current discharge is calculated, during calculating the standing
Average heat radiation power, the average heat production power is added with the heat radiation power that is averaged, obtains the lithium-ion electric to be measured
Pond constant-current charge and the total yield thermal power for standing process or constant-current discharge and standing process；
Step 3：Test the DC internal resistance of the lithium ion battery to be measured；
Step 4：It is calculated according to the Bernardi formula of such as I form of formula in conjunction with the total yield thermal power and the DC internal resistance
The warm entropy coefficient d of the lithium ion battery to be measuredU/dT, then obtain the lithium ion battery constant-current charge to be measured and stood
Journey or constant-current discharge and the total yield thermal power general formula for standing process；
q=(I/V)×[IR+T(dU/dT)] formula I
Wherein, in formula I, q is the lithium ion battery constant-current charge to be measured and stands process or constant-current discharge and stand process
Total yield thermal power, I are the electric current of the lithium ion battery constant-current charge to be measured or constant-current discharge, and V is the lithium-ion electric to be measured
The volume of pond battery core, R are the DC internal resistance of the lithium ion battery to be measured, and T is the initial temperature of the lithium ion battery to be measured,
dU/dTFor the warm entropy coefficient of the lithium ion battery to be measured.
For battery from being fabricated onto use process, temperature rise is one of the factor paid close attention to the most, and temperature rise situation reflects in battery
The actual conditions in portion are battery designs and judge one of standard of battery performance.The main source for causing battery temperature rise is battery
The phenomenon that internal driving and electrochemical reaction, the effect both in charge and discharge process generates thermal power, causes battery temperature rise.This hair
Bright middle use routine experiment temp measuring method establishes lithium battery heat production model, obtains the insulation of lithium battery in conjunction with Bernardi formula
Heat production general formula is assessed the heat production power of lithium battery under different multiplying charge status using simulation software, show that lithium battery is filling
Temperature rise situation in discharge process.
Temperature rise appraisal procedure can be used to assess the temperature rise situation of lithium battery charge or discharge process in the present invention, assessment lithium from
When the temperature rise situation of sub- battery charging process, average heat production power described in step 2 be during the constant-current charge it is described to
Survey the average heat production power of lithium ion battery.When assessing the temperature rise situation of the lithium ion battery discharge process to be measured, step 2
Described in average heat production power be the lithium ion battery to be measured during the constant-current discharge average heat production power.
Charge and discharge are carried out to lithium ion battery using charge and discharge electric cabinet, charge and discharge mode uses constant-current charge-standing or constant current
Electric discharge-standing work step.
For lithium battery in charge and discharge process, heat production power a part improves battery temperature, and another part is lost in environment；
Lithium battery only exists outside heat dissipation in the stage of standing, at any time according to temperature during charging and discharging lithium battery process and standing
Situation of change, in conjunction with the specific heat capacity C of lithium battery electric corepAnd the physical parameters such as quality m, volume V of lithium battery electric core, respectively
Average heat radiation power during average heat production power of the lithium battery in charge and discharge process is calculated and stands, will be above-mentioned flat
Equal heat production power and average heat radiation power are added to get lithium ion battery charge or discharge out and stand the total yield thermal power of process
q。
According to Bernardi formula, Bernardi formula is q=(I/V) × [IR+T (dU/dT)], in above-mentioned formula, lithium
The total yield thermal power of battery considers two factors, and one is that the DC internal resistance of lithium battery influences, another is electrochemical reaction mistake
Journey, electrochemical reaction process can be by I × T × (dU/dT) acquire, but due to self discharge, warm entropy coefficient dU/dTIt is difficult
It is accurately measured, therefore calculates warm entropy coefficient d by the way of counter push awayU/dT.I.e. in conjunction with lithium battery total yield thermal power q and
DC internal resistance R extrapolates the warm entropy coefficient d of lithium batteryU/dT, then obtain the total yield thermal power of the lithium ion battery to be measured
General formula finally combines simulation software, assesses the temperature rise situation in the lithium ion battery charge and discharge process to be measured.
In order to illustrate the calculating process of lithium battery charge or discharge in the present invention and standing process total yield thermal power, referring to attached
Fig. 1 is illustrated.Square shaped ternary lithium ion battery carries out constant-current discharge using different discharge-rates, is 4.2V by voltage
Lithium battery constant-current discharge to 2.8V, then stood, time of repose 1h, lithium during obtained constant-current discharge, standing
The relationship of battery temperature and time are as shown in Fig. 1.By attached drawing 1 it is found that under different discharge-rates, the temperature of lithium battery is first
The case where being reduced after raising, according to discharge process and standing process temperature variation, in conjunction with the specific heat capacity C of lithium battery electric corep, quality
M, the average heat radiation power during can calculating the average heat production power of lithium battery during discharge and standing, will be averaged
Heat production power and average heat radiation power are added to get lithium-ion electric tank discharge out and stand the total yield thermal power of process.
Lithium battery temperature rise appraisal procedure all has preferable be applicable in different model, various sizes of lithium battery in the present invention
Property, applied widely in engineering, mesuring battary can be cylinder type lithium battery, quadrate lithium battery, flexible-packed battery, aluminum-shell battery
Etc..
During the charging process, temperature variations are similar to discharge process for lithium ion battery, can equally be become according to temperature
Change situation, in conjunction with the specific heat capacity C of lithium battery electric corep, quality m, calculate the average heat production power of lithium battery during the charging process
With the average heat radiation power during standing, average heat production power is added with average heat radiation power to get lithium ion battery out
The total yield thermal power of charging and the process of standing.I.e. the present invention in temperature rise appraisal procedure for lithium battery charging process and discharged
Cheng Jun is applicable in.
Further, the lithium ion battery to be measured is wrapped up using thermal insulation material, is placed in sealed environment and is tested.It protects
Adiabator is preferably heat-preservation cotton.Lithium battery is wrapped up with thermal insulation material, is tested in sealed environment, extraneous ring can be reduced
Interference of the border to temperature test improves the stability and accuracy of temperature test.
Further, the time of repose is 30-90min.Select suitable time of repose that lithium battery was being stood
Electrochemical reaction is stablized in journey, and the too short then inside battery of time of repose accurate cannot be obtained also in the higher situation of the extent of reaction
The temperature variations of lithium battery out；Time of repose is too long, extends the testing time, reduces testing efficiency.
Further, the average heat production power of the lithium ion battery to be measured is calculated by formula II；
qd=Cp×m×(△T d /△t d ) formula II
Wherein, in formula II, qdFor the average heat production power of the lithium ion battery to be measured, CpFor the lithium ion battery battery to be measured
The specific heat capacity of core, m are the quality of the lithium ion battery cell to be measured, △T d During the constant-current charge or constant-current discharge
The temperature change value of the lithium ion battery to be measured, △t d For the lithium ion battery temperature change △ to be measuredT d Time used.
When assessing the charging process of lithium battery, △T d For the temperature change value during lithium battery constant-current charge；When assessment lithium battery
Discharge process when, △T d For the temperature change value during lithium battery constant-current discharge.
Further, the average heat radiation power of the lithium ion battery to be measured is calculated by formula III；
qs=Cp×m×(△T s /△t s ) formula III
Wherein, in formula III, qsFor the average heat radiation power of the lithium ion battery to be measured, CpFor the lithium ion battery battery to be measured
The specific heat capacity of core, m are the quality of the lithium ion battery cell to be measured, △T s For lithium ion to be measured described during the standing
The temperature change value of battery, △t s For the lithium ion battery temperature change △ to be measuredT s Time used.
The average heat production power q of lithium batteryd, average heat radiation power qs, in conjunction with lithium battery electric core specific heat capacity Cp, battery core quality m
And temperature variations, using conventional Calculation Method, calculation method is simple, calculated result is accurate, can be improved assessment side
The operability and applicability of method.
Further, the DC internal resistance test method is HPPC test.Using conventional H PPC test method, 10s is selected
Pulse calculates the DC internal resistance of lithium battery, and test method is easy to be mature.
Further, in the direct current that the DC internal resistance is the charge states of lithium ion battery to be measured when being 10%-100%
Resistance.Lithium battery use process state-of-charge is generally 10% or more, and when state-of-charge is less than 10%, DC internal resistance mutation is larger,
The actual conditions of inside battery can not be accurately reflected.Inventors have found that the situation identical in lithium battery model, temperature in the present invention
Under, the DC internal resistance of lithium ion battery difference electric current is almost the same, and when state-of-charge is 10%-100% DC internal resistance it is flat
DC internal resistance when mean value and state-of-charge are 50% is suitable；Meanwhile current battery user is straight when being typically all according to 50%
Internal resistance is flowed to characterize the performance of battery.Therefore DC internal resistance when preferably state-of-charge is 50% in the present invention, which is used as, calculates basis,
Can simplified mathematical model and calculation method, while the working condition of lithium battery can be objectively responded.
Further, when calculating the total yield thermal power of the lithium ion battery charging process to be measured, the temperature entropy coefficient dU/
dTTake positive value；When calculating the total yield thermal power of the lithium ion battery discharge process to be measured, the temperature entropy coefficient dU/dTIt takes negative
Value.Bernardi formula for different use conditions can equivalent conversion go out different forms, due in charge and discharge process,
The temperature variation curve of lithium battery is similar, the difference is that, in charging process, voltage and the time of lithium battery are positively correlated,
The voltage of lithium battery and time are negatively correlated in discharge process, i.e., warm entropy coefficient dU/dTVariation tendency it is different, when calculating lithium electricity
When the total yield thermal power of pond constant-current charge and standing process, warm entropy coefficient dU/dTTake positive value；When calculate lithium battery constant-current discharge with
When the total yield thermal power of standing process, warm entropy coefficient dU/dTNegative value is taken, then obtain constant-current charge or constant-current discharge and was stood
The general formula of lithium battery total yield thermal power in journey.
The present invention also provides a kind of lithium ion battery temperature rise appraisal procedure, according to above-mentioned lithium ion battery constant-current charge with
Standing process or constant-current discharge and the total yield thermal power general formula for standing process assess the lithium ion to be measured in conjunction with simulation software
The temperature rise situation of battery, the temperature rise appraisal procedure are suitable for assessing the lithium ion battery to be measured during charge or discharge
Temperature rise situation.
The present invention has the following advantages that：
1. establishing lithium battery total yield thermal power in conjunction with Bernardi formula using conventional temperature testing method in the present invention
Computation formula assesses lithium battery temperature rise situation using simulation software, and operation is simple, and assessment result is accurate, can
Reflect the truth of lithium battery.
2. lithium battery temperature rise appraisal procedure show that the computation formula of pond total yield thermal power can exist to lithium battery in the present invention
Temperature rise situation under different charge-discharge magnifications is assessed, and the assessment time is short, high-efficient.
3. lithium battery temperature rise appraisal procedure all has preferably different model, various sizes of lithium battery in the present invention
Applicability, engineering is applied widely, is suitable for cylinder type lithium battery, quadrate lithium battery, flexible-packed battery, aluminum-shell battery etc..
Detailed description of the invention
Fig. 1 is lithium ion battery temperature versus time curve to be measured in the present invention.
Fig. 2 is lithium ion battery temperature versus time curve to be measured in the present invention.
Fig. 3 is lithium ion battery direct-current internal resistance test chart to be measured in the present invention.
Temperature versus time curve when Fig. 4 is discharged for lithium ion battery to be measured in the present invention with 1C.
Internal temperature of battery cloud charts when Fig. 5 is discharged for lithium ion battery to be measured in the present invention with 1C.
Temperature versus time curve when Fig. 6 is discharged for lithium ion battery to be measured in the present invention with 2C.
Internal temperature of battery cloud charts when Fig. 7 is discharged for lithium ion battery to be measured in the present invention with 2C.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Lithium ion battery to be measured uses the 2714891-45AH type lithium ion battery of our company's production, battery core in the present embodiment
Volume V is 363636mm3, battery core quality m is 835g, battery core specific heat capacity CpIt is 1.012kJ/ (kgK) by lithium ion battery to be measured
It is wrapped up with heat-preservation cotton, is tested in a sealed meter environment.
Embodiment 1
Temperature rise assessment is carried out to lithium ion battery discharge process to be measured in the present embodiment, appraisal procedure is：
Step 1：Lithium ion battery to be measured is successively carried out to constant-current discharge, is stood, the constant-current discharge measures during standing
The temperature of the lithium ion battery surface to be measured.
Constant-current discharge is with 4C current discharge 994s, time of repose 3542s（59min）.Lithium during constant-current discharge, standing
Battery temperature versus time curve is as shown in Fig. 2.
Step 2：The average heat production power of the lithium ion battery to be measured during the constant-current discharge is calculated, institute is calculated
The average heat radiation power for stating the lithium ion battery to be measured during standing, by the average heat production power and the average heat dissipation
Power is added, and obtains the total yield thermal power of the lithium ion battery to be measured.
Average heat production power：According to formula qd=Cp×m×(△T d /△t d ), C in formulapFor 1.012kJ/ (kgK), m is
835g, △T d It is 27.8 DEG C, △t d For 994s, averaging of income heat production power qdFor 23.633w；
Average heat radiation power：According to formula qs=Cp×m×(△T s /△t s ), C in formulapFor 1.012kJ/ (kgK), m is
835g, △T s It is 20.9 DEG C, △t s For 3542s, averaging of income heat production power qdFor 4.986w；
Total yield thermal power：q=qd+qs=28.619w。
Step 3：Test the DC internal resistance of the lithium ion battery to be measured.
Using the DC internal resistance under HPPC pulse 10s test 50% state-of-charge of lithium battery at normal temperature in the present embodiment, fill
Discharge current is 1C, and DC internal resistance test chart is as shown in Fig. 3, and the mean direct internal resistance for picking and placing electricity is 0.9523m Ω.
Step 4：According to the Bernardi formula of such as I form of formula, in conjunction with the total yield thermal power and the DC internal resistance,
Calculate the warm entropy coefficient d of the lithium ion battery to be measuredU/dT, then obtain the total yield thermal power of the lithium ion battery to be measured
General formula；
q=(I/V)×[IR+T(dU/dT)] formula I
Wherein, in formula I, q is that total yield the thermal power 28.619w, I of lithium ion battery to be measured are lithium ion battery constant-current discharge to be measured
Electric current 4C, V is the volume 0.363636 × 10 of lithium ion battery cell to be measured-6m3, R is in the direct current of lithium ion battery to be measured
0.9523m Ω is hindered, T is 30 DEG C of temperature of lithium ion battery to be measured, dU/dTFor the warm entropy coefficient d of lithium ion battery to be measuredU/dT
It is -0.0399.
Step 5：The total yield thermal power general formula of the lithium ion battery to be measured according to step 4 emulates soft in conjunction with CFD
Part assesses the temperature rise situation of the lithium ion battery to be measured；
The total yield thermal power general formula of the lithium ion battery to be measured is：q=(I/V)×[0.9523I-0.0399T] ×10-3, root
It is obtained in lithium battery temperature versus time curve and battery according to gained total yield thermal power general formula in conjunction with CFD simulation software
The Temperature Distribution cloud atlas in portion can assess temperature rise situation of the lithium ion battery to be measured under different discharge-rates.
In conjunction with the total yield thermal power general formula of lithium battery in the present embodiment, when being discharged with the electric current of 1C, the temperature of lithium battery
Degree versus time curve is as shown in Fig. 4, and Temperature Distribution cloud atlas is as shown in Fig. 5.It can be with quick predict lithium electricity by attached drawing 4
Temperature rise situation when pond is discharged with 1C, when being discharged by the available lithium battery of attached drawing 5 with 1C inside profiling temperatures.
In conjunction with the total yield thermal power general formula of lithium battery in the present embodiment, when being discharged with the electric current of 2C, the temperature of lithium battery
Degree versus time curve is as shown in Fig. 6, and Temperature Distribution cloud atlas is as shown in Fig. 7.It can be with quick predict lithium electricity by attached drawing 6
Temperature rise situation when pond is discharged with 2C, when being discharged by the available lithium battery of attached drawing 7 with 2C inside profiling temperatures.I.e. originally
It is capable of the temperature of quick predict lithium ion battery in conjunction with CFD simulation software using the total yield thermal power general formula of lithium battery in embodiment
Situation is risen, the distribution situation of lithium battery internal temperature of battery under different discharge-rates can be obtained.
Embodiment 2
Temperature rise assessment is carried out to lithium ion battery discharge process to be measured in the present embodiment, compared with Example 1, the present embodiment is not
It is with place, battery temperature is 30 DEG C before constant-current discharge, and constant-current discharge process discharge current is 5C, after constant-current discharge 600s,
Lithium battery temperature is 50.3 DEG C, time of repose 3542s（59min）, temperature is 34.2 DEG C after standing.
Calculate average heat production power qdFor 28.590w；Average heat radiation power qsFor 1.002w；Total yield thermal power q is
29.592w.DC internal resistance is 0.9523m Ω.The warm entropy coefficient d of gained is calculated according to Bernardi formulaU/dTIt is -0.0870.
The total yield thermal power general formula of lithium ion battery to be measured described in the present embodiment is：q=(I/V)×[0.9523I-
0.0870T] ×10-3, the lithium ion to be measured can be assessed in conjunction with CFD simulation software according to gained total yield thermal power general formula
Temperature rise situation of the battery under different discharge-rates.
Embodiment 3
Temperature rise assessment is carried out to lithium ion battery charging process to be measured in the present embodiment, appraisal procedure is：
The temperature of battery is 30 DEG C before constant-current charge, and constant-current charge is charged 30min with 2C electric current, and temperature is 45.7 after constant-current charge
℃；Time of repose is 60min, and lithium battery temperature is 32.8 DEG C after standing.
Calculate average heat production power qdFor 7.370w；Average heat radiation power qsFor 3.028w；Total yield thermal power q is
10.398w.DC internal resistance is 0.9523m Ω.Charging process temperature entropy coefficient dU/dTPositive value is taken, is calculated according to Bernardi formula
Gained temperature entropy coefficient dU/dTIt is 0.0005.
The total yield thermal power general formula of lithium ion battery to be measured described in the present embodiment is：q=(I/V)×[0.9523I+
0.0005T] ×10-3, the lithium ion to be measured can be assessed in conjunction with CFD simulation software according to gained total yield thermal power general formula
Temperature rise situation of the battery under different rate of charge.
Embodiment 4
Temperature rise assessment is carried out to lithium ion battery charging process to be measured in the present embodiment, appraisal procedure is：
The temperature of battery is 30 DEG C before constant-current charge, and constant-current charge is charged 30min with 3C electric current, and temperature is 49.7 after constant-current charge
℃；Time of repose is 60min, and lithium battery temperature is 35.2 DEG C after standing.
Calculate average heat production power qdFor 9.248w；Average heat radiation power qsFor 3.404w；Total yield thermal power q is
12.652w.DC internal resistance is 0.9523m Ω.Charging process temperature entropy coefficient dU/dTPositive value is taken, is calculated according to Bernardi formula
Gained temperature entropy coefficient dU/dTIt is 0.0186.
The total yield thermal power general formula of lithium ion battery to be measured described in the present embodiment is：q=(I/V)×[0.9523I+
0.0186T] ×10-3, the lithium ion to be measured can be assessed in conjunction with CFD simulation software according to gained total yield thermal power general formula
Temperature rise situation of the battery under different rate of charge.
Finally, it should be noted that above embodiments be only to illustrate the technical solution of the embodiment of the present invention rather than to its into
Row limitation, although the embodiment of the present invention is described in detail referring to preferred embodiment, those skilled in the art
It should be understood that the technical solution of the embodiment of the present invention can be still modified or replaced equivalently, and these are modified or wait
The range of modified technical solution disengaging technical solution of the embodiment of the present invention cannot also be made with replacement.
Claims (10)
1. a kind of calculation method of lithium ion battery total yield thermal power general formula, which is characterized in that include the following steps：
Step 1：Lithium ion battery to be measured is subjected to constant-current charge or constant-current discharge, is then allowed to stand, measure the constant-current charge or
The temperature of the lithium ion battery surface to be measured during constant-current discharge process and the standing；
Step 2：The average heat production power during the constant-current charge or constant-current discharge is calculated, during calculating the standing
Average heat radiation power, the average heat production power is added with the heat radiation power that is averaged, obtains the lithium-ion electric to be measured
Pond constant-current charge and the total yield thermal power for standing process or constant-current discharge and standing process；
Step 3：Test the DC internal resistance of the lithium ion battery to be measured；
Step 4：It is calculated according to the Bernardi formula of such as I form of formula in conjunction with the total yield thermal power and the DC internal resistance
The warm entropy coefficient d of the lithium ion battery to be measuredU/dT, then obtain the lithium ion battery constant-current charge to be measured and stood
Journey or constant-current discharge and the total yield thermal power general formula for standing process；
q=(I/V)×[IR+T(dU/dT)] formula I
Wherein, in formula I, q is the lithium ion battery constant-current charge to be measured and stands process or constant-current discharge and stand process
Total yield thermal power, I are the electric current of the constant-current charge or constant-current discharge, and V is the volume of the lithium ion battery cell to be measured, R
For the DC internal resistance of the lithium ion battery to be measured, T is the initial temperature of the lithium ion battery to be measured, dU/dTFor it is described to
Survey the warm entropy coefficient of lithium ion battery.
2. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：The lithium to be measured
Ion battery is wrapped up using thermal insulation material, is placed in progress temperature measurement in sealed environment.
3. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：When the standing
Between be 30-90min.
4. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：The lithium to be measured
The average heat production power of ion battery is calculated by formula II；
qd=Cp×m×(△T d /△t d ) formula II
Wherein, in formula II, qdFor the average heat production power of the lithium ion battery to be measured, CpFor the lithium ion battery battery to be measured
The specific heat capacity of core, m are the quality of the lithium ion battery cell to be measured, △T d During the constant-current charge or constant-current discharge
The temperature change value of the lithium ion battery to be measured, △t d For the lithium ion battery temperature change △ to be measuredT d Time used.
5. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：The lithium to be measured
The average heat radiation power of ion battery is calculated by formula III；
qs=Cp×m×(△T s /△t s ) formula III
Wherein, in formula III, qsFor the average heat radiation power of the lithium ion battery to be measured, CpFor the lithium ion battery battery to be measured
The specific heat capacity of core, m are the quality of the lithium ion battery cell to be measured, △T s For lithium ion to be measured described during the standing
The temperature change value of battery, △t s For the lithium ion battery temperature change △ to be measuredT s Time used.
6. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：In the direct current
Test method is hindered for HPPC test.
7. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：In the direct current
Resistance is DC internal resistance of the charge states of lithium ion battery to be measured when being 10%-100%.
8. the calculation method of lithium ion battery total yield thermal power general formula as described in claim 1, it is characterised in that：Calculate it is described to
When surveying lithium ion battery constant-current charge and standing the total yield thermal power of process, the temperature entropy coefficient dU/dTTake positive value；Described in calculating
When the total yield thermal power of lithium ion battery constant-current discharge to be measured and standing process, the temperature entropy coefficient dU/dTTake negative value.
9. a kind of lithium ion battery temperature rise appraisal procedure, it is characterised in that：According to as described in any one of claim 1 to 8 to
It surveys lithium ion battery constant-current charge and stands process or constant-current discharge and stand the total yield thermal power general formula of process, it is soft in conjunction with emulating
Part assesses the temperature rise situation of the lithium ion battery to be measured.
10. lithium ion battery temperature rise appraisal procedure as claimed in claim 9, it is characterised in that：The temperature rise appraisal procedure is applicable in
In temperature rise situation of the assessment lithium ion battery to be measured during charge or discharge.
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