CN105259510B - The assay method of lithium ion battery temperature entropy coefficient - Google Patents
The assay method of lithium ion battery temperature entropy coefficient Download PDFInfo
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- CN105259510B CN105259510B CN201510686138.6A CN201510686138A CN105259510B CN 105259510 B CN105259510 B CN 105259510B CN 201510686138 A CN201510686138 A CN 201510686138A CN 105259510 B CN105259510 B CN 105259510B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 55
- 238000003556 assay Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000002441 reversible effect Effects 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims 1
- 150000002500 ions Chemical class 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 claims 1
- 238000013507 mapping Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000004364 calculation method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses the assay method of lithium ion battery temperature entropy coefficient, by the way that battery charging and discharging instrument and adiabatic accelerating calorimeter are combined, sinusoidal perturbation electric current is applied to battery, monitoring battery surface temperature in real time, and battery temperature changing value caused by by Fourier transform obtaining reversible heat production, then calculate the warm entropy coefficient of lithium ion battery.The assay method of lithium ion battery temperature entropy coefficient provided by the invention, the warm entropy coefficient of lithium ion battery can be quickly determined, and test process is not easy to be influenceed by self-discharge of battery, and measuring accuracy is high.
Description
Technical field
The present invention relates to the assay method of technical field of lithium ion, more particularly to lithium ion battery temperature entropy coefficient.
Background technology
With application of the lithium ion battery in electric automobile, based on the consideration to security, the assessment to battery heat production
And control turns into essential project in battery and module design.Battery in use, with entering for discharge and recharge
OK, heat production can occur for battery, and a part comes from electrochemical reaction Entropy Changes heat production, and a part comes from battery impedance heat production, preceding
Person for can backheating, and the latter for can not backheating, test respectively and research to two kinds of heat production are advantageous to under specific application environment
The optimization design of battery system and the selection of material.
In the calculating of the reversible heat production of battery, it is necessary first to the warm entropy coefficient of battery is tested, and tests temperature at present
The conventional method of entropy coefficient is the direct method of measurement, i.e., the open-circuit voltage of temperature change test battery is carried out under fixed SOC, due to
This method needs battery to reach electrochemical equilibrium at a certain temperature, therefore time-consuming for test, typically in more than 24h；Such as simultaneously
There is slight self-discharge phenomenon in fruit battery, it will have a strong impact on the accuracy of test.
The content of the invention
In order to solve problem of the prior art, it is an object of the present invention to provide a kind of measure side of lithium ion battery temperature entropy coefficient
Method, the quick measure of lithium ion battery temperature entropy coefficient can be achieved.
Based on above mentioned problem, technical scheme provided by the invention is：
The assay method of lithium ion battery temperature entropy coefficient, comprises the following steps：
(1) quality of lithium ion battery to be measured is weighed, positive and negative lug is then welded on lithium ion battery to be measured；
(2) lithium ion battery to be measured is placed in the hot chamber of adiabatic accelerating calorimeter, thermocouple is fixed on lithium-ion electric
The center of pool surface, while the positive and negative lug end of lithium ion battery is wired on charge-discharge test instrument, remember
Record the voltage of lithium ion battery, electric current and time；
(3) adiabatic accelerating calorimeter, setting start temperature, end temp, heating amplitude, slope sensitivity and wait are run
Time, wherein heating amplitude is zero；
(4) after adiabatic accelerating calorimeter temperature stabilization, run charge-discharge test instrument and set the amplitude I of sinusoidal currentamp
With frequency f, current disturbing is carried out to lithium ion battery；
(5) lithium ion battery is charged a period of time, the surface temperature of lithium ion battery data of collection is corresponded into discharge and recharge
Time maps, and passes through the isolated temperature amplitude data consistent with sinusoidal current frequency f of Fourier transform, you can traitor's property thermal conductivity
The surface temperature of lithium ion battery of cause increases maximum Δ T；
(6) warm entropy coefficient is calculated according to relationship below：
Wherein：
For the warm entropy coefficient under the certain charging state of battery, Jmol-1·K-1；
CpFor battery specific heat, Jg-1·K-1；
M is battery quality, g；
Δ T is surface temperature of lithium ion battery increasing value, K caused by reversible heat；
IampFor sinusoidal current amplitude, A；
T is battery temperature, K.
In one of which embodiment, end temp is more than start temperature in the step (3), and both differences exist
More than 3 DEG C.
In one of which embodiment, slope sensitivity is 0.02 DEG C/min in the step (3).
In one of which embodiment, in the step (3) stand-by period be at least 15min.
In one of which embodiment, the cycle-index of sinusoidal current is at least 20 times in the step (4).
Compared with prior art, it is an advantage of the invention that：
Using technical scheme, by the way that battery charging and discharging instrument and adiabatic accelerating calorimeter are combined, battery is applied
Add sinusoidal perturbation electric current, monitor battery surface temperature, and battery temperature caused by obtaining reversible heat production by Fourier transform in real time
Changing value to be spent, then calculates the warm entropy coefficient of lithium ion battery, this method can quickly determine the warm entropy coefficient of lithium ion battery,
And test process is not easy to be influenceed by self-discharge of battery, measuring accuracy is high.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described, drawings in the following description are only some embodiments of the present invention, for the common skill in this area
For art personnel, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 be lithium ion battery temperature entropy coefficient of the present invention the surface temperature of lithium ion battery of assay method embodiment 1 at any time
Between variation relation figure；
Variation diagrams of the Fig. 2 for battery surface temperature after the Fourier transform of the embodiment of the present invention 1 with frequency.
Embodiment
Such scheme is described further below in conjunction with specific embodiment.It should be understood that these embodiments are to be used to illustrate
The present invention and be not limited to limit the scope of the present invention.The implementation condition used in embodiment can be done according to the condition of specific producer
Further adjustment, unreceipted implementation condition is usually the condition in normal experiment.
The present invention is carried out in lithium ion battery temperature entropy coefficient testing method, the adiabatic acceleration that equipment used is Britain THT
Calorimeter EV+Battery Calorimeter and Arbin discharge and recharge instrument, mesuring battary select commercialized ternary system 18650
Lithium ion battery, by lithium ion battery with 0.1C constant currents standard charging 3h to 30% charging state.
Embodiment 1
(1) quality of lithium ion battery to be measured is weighed, positive and negative lug is then welded on lithium ion battery to be measured；
(2) lithium ion battery to be measured is placed in the hot chamber of adiabatic accelerating calorimeter, thermocouple is fixed on lithium-ion electric
The center of pool surface, while the positive and negative lug end of lithium ion battery is wired on charge-discharge test instrument, remember
Record the voltage of lithium ion battery, electric current and time data；
(3) run adiabatic accelerating calorimeter, set start temperature as 30 DEG C, end temp are 50 DEG C, heating amplitude is 0,
Slope sensitivity is 0.02 DEG C/min, stand-by period 15min, and other are instrument default value；
(4) after adiabatic accelerating calorimeter temperature stabilization, i.e., 0.02 DEG C of the temperature fluctuation range ＜ in 10min, operation is set
The sinusoidal charging and discharging currents set, current disturbing, the amplitude I of sinusoidal current are carried out to batteryampIt is set as that 1A, frequency f are set as
2mHz, the cycle-index of sinusoidal current are set as 20 times；
(5) after to lithium ion battery charging 3h, as shown in figure 1, the surface temperature of lithium ion battery data of collection are corresponding
The discharge and recharge time maps, and takes 10 later temperature and time data to carry out Fourier transform, as shown in Fig. 2 it is isolated with
Temperature amplitude data consistent sinusoidal current frequency f are 0.206 DEG C, you can surface temperature of lithium ion battery caused by traitor's property heat increases
Long maximum Δ T；
(6) warm entropy coefficient is calculated according to relationship below：
Wherein：
For the warm entropy coefficient under the certain charging state of battery, Jmol-1·K-1；
CpFor battery specific heat, Jg-1·K-1；
M is battery quality, g；
Δ T is surface temperature of lithium ion battery increasing value, K caused by reversible heat；
IampFor sinusoidal current amplitude, A；
T is battery temperature, K.
As shown in Table 1, battery temperature T value is battery in test process to warm entropy coefficient result of calculation wherein in project 1
Minimum temperature, battery temperature T value is the maximum temperature of battery in test process in project 2, the battery temperature in project 3
T value is the average value of battery lowest temperature angle value and maximum temperature value in test process：
The warm entropy coefficient result of calculation of table one
From upper table result of calculation, battery temperature T is that the calculated value of warm entropy coefficient influences very little, when battery was being tested
Temperature fluctuation range is at 0-5 DEG C in journey, it is ensured that the warm entropy coefficient measured is accurate, and battery temperature T can use minimum and maximum temperature
Average value.
The foregoing examples are merely illustrative of the technical concept and features of the invention, its object is to allow the person skilled in the art to be
Present disclosure can be understood and implemented according to this, it is not intended to limit the scope of the present invention.It is all smart according to the present invention
The equivalent transformation or modification that refreshing essence is done, should all be included within the scope of the present invention.
Claims (5)
1. the assay method of lithium ion battery temperature entropy coefficient, it is characterised in that comprise the following steps：
(1) quality of lithium ion battery to be measured is weighed, positive and negative lug is then welded on lithium ion battery to be measured；
(2) lithium ion battery to be measured is placed in the hot chamber of adiabatic accelerating calorimeter, thermocouple is fixed on lithium ion battery table
The center in face, while the positive and negative lug end of lithium ion battery is wired on charge-discharge test instrument, record lithium
The voltage of ion battery, electric current and time；
(3) adiabatic accelerating calorimeter is run, when setting start temperature, end temp, heating amplitude, slope sensitivity and waiting
Between, wherein heating amplitude is zero；
(4) after adiabatic accelerating calorimeter temperature stabilization, run charge-discharge test instrument and set the amplitude I of sinusoidal currentampAnd frequency
Rate f, current disturbing is carried out to lithium ion battery；
(5) lithium ion battery is charged a period of time, the surface temperature of lithium ion battery data of collection is corresponded into the discharge and recharge time
Mapping, passes through the isolated temperature amplitude data consistent with sinusoidal current frequency f of Fourier transform, you can caused by traitor's property heat
Surface temperature of lithium ion battery increases maximum Δ T；
(6) warm entropy coefficient is calculated according to relationship below：
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Wherein：
For the warm entropy coefficient under the certain charging state of battery, Jmol-1·K-1；
CpFor battery specific heat, Jg-1·K-1；
M is battery quality, g；
Δ T is surface temperature of lithium ion battery increasing value, K caused by reversible heat；
IampFor sinusoidal current amplitude, A；
T is battery temperature, K.
2. the assay method of lithium ion battery temperature entropy coefficient according to claim 1, it is characterised in that：The step (3)
Middle end temp is more than start temperature, and both differences are more than 3 DEG C.
3. the assay method of lithium ion battery temperature entropy coefficient according to claim 1, it is characterised in that：The step (3)
Middle slope sensitivity is 0.02 DEG C/min.
4. the assay method of lithium ion battery temperature entropy coefficient according to claim 1, it is characterised in that：The step (3)
The middle stand-by period is at least 15min.
5. the assay method of lithium ion battery temperature entropy coefficient according to claim 1, it is characterised in that：The step (4)
The cycle-index of middle sinusoidal current is at least 20 times.
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| CN110361662B (en) * | 2019-07-16 | 2021-05-18 | 深圳市比克动力电池有限公司 | Method for measuring temperature entropy coefficient of lithium ion battery |
| CN116203441B (en) * | 2023-03-24 | 2023-10-27 | 广州巨湾技研有限公司 | Method and device for testing temperature entropy coefficient of lithium ion battery |
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