CN107024661A - A kind of evaluation method of the instantaneous heat generation rate of soft-package battery - Google Patents
A kind of evaluation method of the instantaneous heat generation rate of soft-package battery Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
A kind of evaluation method of the instantaneous heat generation rate of soft-package battery, (1) measures per second temperature rise data of the battery in adiabatic environment under a certain charge/discharge multiplying power, calculates per second storage heat power q of the battery under the multiplying power operating mode1；(2) standing temperature drop data of the measurement battery after a certain charge/discharge multiplying power terminates in adiabatic environment, by curve matching, obtain NATURAL CONVECTION COEFFICIENT OF HEAT h under the environment；(3) according to NATURAL CONVECTION COEFFICIENT OF HEAT h, and the temperature rise data per second in adiabatic environment, calculate corresponding free convection wasted power q per second during the environment charge/discharge2；(4) by storage heat power q per second1With free convection wasted power q per second2Correspondence is added the heat power per second obtained under the operating mode, then obtains instantaneous heat generation rate according to heat generation rate fitting of a polynomial per second.The present invention can easily calculate heat generation rate of the soft-package battery in charge and discharge process, have certain value to the performance in research battery charge and discharge process.
Description
Technical field
The invention belongs to cell art, it is related to a kind of method of testing of soft-package battery.
Background technology
With continuing to develop for electrokinetic cell, soft-package battery with the advantages of its cost is low, specific energy is high by new energy vapour
The favor of garage's industry, and estimate the change of heat generation rate of the soft-package battery in charge and discharge process has important for its further research
Meaning.
The test about electrokinetic cell heat power mainly has at present：(1) using adiabatic accelerating calorimeter measurement heat generation rate,
This method spends higher；(2) temperature rise of battery is measured, cell heat is divided into three parts, is that battery and air are naturally right respectively
Flow heat exchange amount, battery and extraneous Radiant exothermicity and self residual heat, such as patent CN104569836A.These are mainly obtained
Be average heat generation rate of the battery under a certain discharge-rate or under time-dependent current operating mode, average heat generation rate can not show battery
The situation of change of heat development during charge/discharge, and the NATURAL CONVECTION COEFFICIENT OF HEAT and radiation heat transfer coefficient value having are warp
Value is tested, there may be certain error in result of calculation.
Therefore, developing the evaluation method and device of a kind of instantaneous heat generation rate of soft-package battery is extremely necessary.
The content of the invention
The present invention is intended to provide a kind of evaluation method and device of the instantaneous heat generation rate of soft-package battery, effectively to estimate Soft Roll
Instantaneous heat power of the battery during a certain rate charge-discharge.
The present invention is achieved by the following technical solutions.
A kind of evaluation method of the instantaneous heat generation rate of soft-package battery of the present invention, comprises the following steps：
(1) per second temperature rise data of the measurement battery in adiabatic environment under a certain charge/discharge multiplying power, according to temperature rise data meter
Calculate per second storage heat power q of the battery under the multiplying power operating mode1；
(2) standing temperature drop data of the measurement battery after a certain charge/discharge multiplying power terminates in adiabatic environment, according to standing temperature
Drop data obtains NATURAL CONVECTION COEFFICIENT OF HEAT h under the environment by logarithmic curve-fitting；
(3) the NATURAL CONVECTION COEFFICIENT OF HEAT h obtained according to above-mentioned fitting, and a certain charge/discharge times in adiabatic environment
Temperature rise data per second under rate, calculate corresponding free convection wasted power q per second during the environment charge/discharge2；
(4) by the above-mentioned storage heat power q per second calculated1With free convection wasted power q per second2, correspond to addition and obtain
Heat power per second under the operating mode, then carries out fitting of a polynomial to heat generation rate per second and obtains instantaneous heat generation rate.
Further, the measurement battery described in step (1) of the present invention is in adiabatic environment under a certain charge/discharge multiplying power
Temperature rise data, instantaneous storage heat power q of the battery under the multiplying power operating mode is calculated according to temperature rise data1, including：
Measure temperature rise data of the battery in adiabatic environment under a certain charge/discharge multiplying power；
Temperature rise data are calculated as follows formula：
Tave=(T1+T2+T3+T4+T5+T6)/6
Wherein T1+T2+T3+T4+T5+T6The temperature that the respectively different place's of layouting thermocouples are measured, TaveIt is each measuring point of battery
Mean temperature.
Further, the temperature rise data according to battery in adiabatic environment under a certain charge/discharge multiplying power, fitting obtains battery
8 order polynomials that temperature is changed over time, the time is abscissa, and temperature is ordinate, that is, obtains the wink that temperature is changed over time
When temperature change formula：
T=f (t)
Wherein T is that battery is fitted transient temperature.
8 order polynomials that the battery temperature obtained according to above-mentioned fitting is changed over time, to time derivation, are obtained in thermal insulation
Heat speed q is stored under the operating mode of this in environmentsFormula
qs=cm (dT/Dt)
Wherein, qsIt is storage heat speed, c is specific heat capacity of the battery under the calorstat temperature, and m is the quality of battery.
According to above-mentioned storage heat generation rate formula, with 1 second for interval, storage heat power per second is calculated, q is designated as1。
Preferably, according to the 8 order polynomial T=f (t) that battery temperature is changed over time are obtained, calculate and established by cable from discharge charge
Begin to charge/discharge to terminate, the battery temperature of every 1 second, be designated as battery fitting transient temperature.
According to standing temperature drop data of the battery after a certain charge/discharge multiplying power terminates in adiabatic environment, pass through exponential curve
Fitting, obtains NATURAL CONVECTION COEFFICIENT OF HEAT h under the environment.
According to Newtonian Cooling formula, free convection heat per second during terminating since charge/discharge to charge/discharge is calculated
Rate：
q2=hA (T-T0)
Wherein, A is the surface area that battery removes the positive and negative lug in two ends, and T is battery fitting transient temperature, T0It is that battery is initial
Temperature, i.e. calorstat temperature.
Then according to during terminating since charge/discharge to charge/discharge, the heat generation rate of kind per second is equal to instantaneous storage heat
Rate and free convection heat generation rate sum, calculate instantaneous heat generation rate：
Q=q1+q2
Calculate the battery heat generation rate at each time point, so by fitting of a polynomial draw battery in insulating box it is a certain
Heat generation rate versus time curve under discharge-rate.
A kind of estimation device of the instantaneous heat generation rate of soft-package battery of the present invention, including：Test device, for battery
The calculating of heat generation rate under the conditions of one discharge-rate, described test device further comprises：Heat-insulating material, insulating box, multichannel temperature
Recorder and the T-shaped thermocouple of at least six are spent, wherein, thermocouple is arranged in soft-package battery positive and negative, and its front surface region is carried out
4 equal portions are divided equally, and thermocouple is arranged in the battery temperature in each subregional center representative region, in addition battery front side, anti-
Face center respectively arranges one；The heat-insulating material is adiabatic aeroge, and at least two layers parcel is carried out to battery ambient；The multichannel
Moisture recorder is at least 6 passages, the change of the temperature during record battery charging/discharging.
The present invention can easily calculate heat generation rate of the soft-package battery in charge and discharge process, draw in charge and discharge process
Heat generation rate change, while calculating simple, accuracy is higher, has to the performance in research battery charge and discharge process certain
Value.
Brief description of the drawings
Fig. 1 is the evaluation method figure of the instantaneous heat generation rate of one embodiment of the invention.
Fig. 2 is the installation drawing of the instantaneous heat generation rate of one embodiment of the invention.
Fig. 3 is the layout drawing of thermocouple outside soft-package battery.
Fig. 4 is that thermocouple measures battery 1C charge/discharge process temperature rise variation diagram under a certain environment temperature.
Fig. 5 is insulating box temperature, the obtained instantaneous heat generation rate variation diagram of battery 1C multiplying power charge/discharge.
Embodiment
The present invention will be described further by following examples.
Embodiment
Measure temperature rise data of the battery in adiabatic environment under a certain charge/discharge multiplying power；
Under following table is 25 DEG C of insulating box, thermal insulation 1C rate of charge, soft-package battery charging and the one piece of data for standing process, when
Between be charging and stand start 0-120s between, every 2s record.Data see below Lie Gebiao.
Temperature rise data are calculated as follows formula：
Tave=(T1+T2+T3+T4+T5+T6)/6
Wherein T1+T2+T3+T4+T5+T6The temperature that the respectively different place's of layouting thermocouples are measured, TaveIt is each measuring point of battery
Mean temperature.
Table 1
According to charging temperature data TaveFitting obtains 8 order polynomials
T=24.95737-0.00448*t+2.95545*10-5*t2-5.0774*10- 8*t3+4.55974*10-11*t4-
2.29266*10- 14*t5+6.53804*10-18*t6-9.92018*10-22*t7+6.23364*10-26*t8
8 order polynomials that the battery temperature obtained according to above-mentioned fitting is changed over time, to time derivation, are obtained in thermal insulation
Heat speed q is stored under the operating mode of this in environmentsFormula
qs=cm (dT/Dt)
Wherein, qsIt is storage heat speed, c is specific heat capacity of the battery under the calorstat temperature, and m is the quality of battery.
According to above-mentioned storage heat generation rate formula, with 2 seconds for interval, storage heat power per second is calculated, q is designated as1。
Table 2
The data that temperature drop is changed over time are stood according to table 1, fitting obtains exponential function expression formula
According to formula：
2.26*10-4=hA/cm
Calculate convection transfer rate h=2.07 (W/ (m2·K))
According to the 8 order polynomial T=f (t) that battery temperature is changed over time are obtained, calculate since charge/discharge to filling/
Electric discharge terminates, the battery temperature of every 1 second, is designated as battery fitting transient temperature, is shown in Table 2.
According to Newtonian Cooling formula, free convection heat per second during terminating since charge/discharge to charge/discharge is calculated
Rate：
q2=hA (T-T0)
Wherein, A is the surface area that battery removes the positive and negative lug in two ends, T batteries fitting transient temperature, T0It is that battery is initially warm
Degree, i.e. calorstat temperature.
Then according to during terminating since charge/discharge to charge/discharge, the heat generation rate of kind per second is equal to instantaneous storage heat
Rate and free convection heat generation rate sum, calculate instantaneous heat generation rate：
Q=q1+q2
Table 3
Calculate the battery heat generation rate at each time point, so by fitting of a polynomial draw battery in insulating box it is a certain
Heat generation rate versus time curve under discharge-rate, is specifically shown in Fig. 5.
Discharge process is calculated ibid.
Claims (4)
1. a kind of evaluation method of the instantaneous heat generation rate of soft-package battery, it is characterized in that comprising the following steps：
(1) per second temperature rise data of the measurement battery in adiabatic environment under a certain charge/discharge multiplying power, are calculated according to temperature rise data
Per second storage heat power q of the battery under the multiplying power operating mode1；
(2) standing temperature drop data of the measurement battery after a certain charge/discharge multiplying power terminates in adiabatic environment, according to standing temperature drop number
According to by curve matching, obtaining NATURAL CONVECTION COEFFICIENT OF HEAT h under the environment；
(3) the NATURAL CONVECTION COEFFICIENT OF HEAT h obtained according to above-mentioned fitting, and in adiabatic environment under a certain charge/discharge multiplying power
Temperature rise data per second, calculate corresponding free convection wasted power q per second during the environment charge/discharge2；
(4) by the above-mentioned storage heat power q per second calculated1With free convection wasted power q per second2, correspond to addition and obtain the work
Heat power per second under condition, then carries out fitting of a polynomial to heat generation rate per second and obtains instantaneous heat generation rate.
2. the evaluation method of the instantaneous heat generation rate of soft-package battery according to claim 1, it is characterized in that the temperature described in step (1)
Rise data and be calculated as follows formula：
Tave=(T1+T2+T3+T4+T5+T6)/6
Wherein T1+T2+T3+T4+T5+T6The temperature that the respectively different place's of layouting thermocouples are measured, TaveIt is being averaged for each measuring point of battery
Temperature.
3. the evaluation method of the instantaneous heat generation rate of soft-package battery according to claim 1, it is characterized in that according to battery in thermal insulation
Temperature rise data in environment under a certain charge/discharge multiplying power, fitting obtains 8 order polynomials that battery temperature is changed over time, time
For abscissa, temperature is ordinate, that is, obtains the transient temperature varying type that temperature is changed over time：
T=f (t)
Wherein T is the battery transient temperature after fitting；
8 order polynomials that the battery temperature obtained according to above-mentioned fitting is changed over time, to time derivation, are obtained in adiabatic environment
In storage heat speed q under the operating modesFormula：
qs=cm (dT/Dt)
Wherein, qsIt is storage heat speed, c is specific heat capacity of the battery under the calorstat temperature, and m is the quality of battery；
According to above-mentioned storage heat generation rate formula, with 1 second for interval, storage heat power per second is calculated, q is designated as1。
4. the evaluation method of the instantaneous heat generation rate of soft-package battery according to claim 1, it is characterized in that according to obtaining battery temperature
The 8 order polynomial T=f (t) that change over time are spent, calculates since charge/discharge to charge/discharge and terminates, the battery temperature of every 1 second
Degree, is designated as battery fitting transient temperature；
According to standing temperature drop data of the battery after a certain charge/discharge multiplying power terminates in adiabatic environment, by exponential curve fitting,
Obtain NATURAL CONVECTION COEFFICIENT OF HEAT h under the environment；
According to Newtonian Cooling formula, free convection heat generation rate per second during terminating since charge/discharge to charge/discharge is calculated：
q2=hA (T-T0)
Wherein, A is the surface area that battery removes the positive and negative lug in two ends, and T is battery fitting transient temperature, T0It is battery initial temperature；
Then according to during terminating since charge/discharge to charge/discharge, the heat generation rate of kind per second be equal to instantaneous storage heat generation rate with
Free convection heat generation rate sum, calculates instantaneous heat generation rate：
Q=q1+q2
The battery heat generation rate at each time point is calculated, and then battery a certain electric discharge in insulating box is drawn by fitting of a polynomial
Heat generation rate versus time curve under multiplying power.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289908A (en) * | 2020-03-31 | 2020-06-16 | 深圳埃瑞斯瓦特新能源有限公司 | Method for measuring and calculating heating power of lithium battery |
| CN113325327A (en) * | 2021-05-25 | 2021-08-31 | 上海工程技术大学 | Method for measuring and calculating transient heat generation rate of power battery based on internal resistance test |
| CN113359038A (en) * | 2021-02-23 | 2021-09-07 | 万向一二三股份公司 | Lithium ion battery discharge and connecting piece heat production verification method |
| CN113570116A (en) * | 2021-07-02 | 2021-10-29 | 福建时代星云科技有限公司 | Method for estimating heating power of storage and charging station and terminal |
| CN114614162A (en) * | 2021-03-29 | 2022-06-10 | 长城汽车股份有限公司 | Battery pack heating control method and device and vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989848A (en) * | 2017-03-05 | 2017-07-28 | 南昌大学 | A kind of evaluation method of the instantaneous heat generation rate of soft-package battery |
-
2017
- 2017-03-10 CN CN201710139672.4A patent/CN107024661A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989848A (en) * | 2017-03-05 | 2017-07-28 | 南昌大学 | A kind of evaluation method of the instantaneous heat generation rate of soft-package battery |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289908A (en) * | 2020-03-31 | 2020-06-16 | 深圳埃瑞斯瓦特新能源有限公司 | Method for measuring and calculating heating power of lithium battery |
| CN113359038A (en) * | 2021-02-23 | 2021-09-07 | 万向一二三股份公司 | Lithium ion battery discharge and connecting piece heat production verification method |
| CN114614162A (en) * | 2021-03-29 | 2022-06-10 | 长城汽车股份有限公司 | Battery pack heating control method and device and vehicle |
| CN113325327A (en) * | 2021-05-25 | 2021-08-31 | 上海工程技术大学 | Method for measuring and calculating transient heat generation rate of power battery based on internal resistance test |
| CN113570116A (en) * | 2021-07-02 | 2021-10-29 | 福建时代星云科技有限公司 | Method for estimating heating power of storage and charging station and terminal |
| CN113570116B (en) * | 2021-07-02 | 2022-02-18 | 福建时代星云科技有限公司 | Method for estimating heating power of storage and charging station and terminal |
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