CN105301501A - Method for estimating generated heat of lithium ion battery under conditions of charge and discharge - Google Patents
Method for estimating generated heat of lithium ion battery under conditions of charge and discharge Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 203
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 238000004458 analytical method Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 238000011156 evaluation Methods 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 14
- 230000020169 heat generation Effects 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 9
- 238000011160 research Methods 0.000 abstract description 3
- 238000005485 electric heating Methods 0.000 abstract 2
- 238000009413 insulation Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- QRXWMOHMRWLFEY-UHFFFAOYSA-N isoniazide Chemical group NNC(=O)C1=CC=NC=C1 QRXWMOHMRWLFEY-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
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Abstract
The invention discloses a method for estimating generated heat of a lithium ion battery under conditions of charge and discharge, and the method comprises the steps: firstly collecting temperature data of a to-be-detected lithium ion battery under the conditions of electric heating and charge and discharge; secondly inputting the temperature data of the battery under different electric heating power into data processing software, and determining the relation equation between the heat loss power and temperature of a lithium ion battery thermal runaway testing and analysis system through employing a thermal balance integro-differential equation (1) and a thermal balance integro-differential equation (2); thirdly inputting the temperature data of the battery under the conditions of charge and discharge into the data processing software, inputting heat, generated within a certain time period, of the lithium ion battery into the data processing software according to the heat of the lithium ion battery, which is obtained by a thermal balance integro-differential equation (3) and is generated within a certain time period, in a process of charge or discharge, and obtaining a relation curve between the charge/discharge heating rate and time and the total generated heat in the process of charge or discharge. The method takes the whole lithium ion battery as a research object, and can obtain the impact on the battery from the charge and discharge conditions.
Description
Technical field
The present invention relates to the evaluation method of lithium ion battery heat-dissipating amount under a kind of discharge and recharge condition.
Background technology
21 century, along with the exhaustion day by day of the traditional natural resources such as coal, oil, rock gas, electrochmical power source has developed into indispensable power source in human lives.Particularly lithium ion battery, this high power capacity secondary chemical sources of electric energy because of its have operating voltage high, have extended cycle life, self discharge is low, the advantage such as fast charging and discharging, memory-less effect can become the desirable environmental protection power supply of all kinds of portable instrument such as mobile phone, notebook computer.But the widespread use of lithium ion battery also brings more lithium ion battery accidents.These accidents have and are caused by battery charging and discharging greatly.
By the heat that estimation lithium ion battery charge and discharge process produces, the size of lithium ion battery energy under charging and discharging state can be understood, thus understand its dangerous size, this safe handling for lithium ion battery is extremely important, for lithium ion battery applications is to field more widely, the theoretical foundation of science is provided, there is important learning value and social effect.
At present, both at home and abroad carry out mainly through thermogravimetric analyzer, differential scanning calorimeter, accelerating calorimeter the size that estimating battery inner two kinds or two or more material produce heat in charge and discharge process, and related to as research object is less using lithium ion battery entirety.
Summary of the invention
Object of the present invention aims to provide the evaluation method of lithium ion battery heat-dissipating amount under a kind of discharge and recharge condition, the method calculates simple, reliable results, by calculating the amount of heat that lithium ion battery charge and discharge process produces, clearly realizes that the risk factor size of battery.
Technical scheme of the present invention is as follows:
Under discharge and recharge condition, an evaluation method for lithium ion battery heat-dissipating amount, comprises the steps:
(1) lithium ion battery thermal runaway detecting and analysing system, is utilized to gather the temperature data of lithium ion battery to be measured under the temperature data of lithium ion battery to be measured under different charge or discharge condition and different electrical heating power;
(2), the temperature data of the lithium ion battery to be measured collected under different electrical heating power in step (1) is imported in data processing software respectively, use infinitesimal analysis thermal balance equation (1) treatment temperature data, obtain the thermal loss power in section sometime, again the mean value of temperature in this time period and thermal loss power are carried out matching, draw the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature under a certain electrical heating power; Take temperature as X-axis, thermal loss power is Y-axis, by unified in same coordinate axis for the relation of the thermal loss power of lithium ion battery thermal runaway detecting and analysing system under different electrical heating power and temperature;
Infinitesimal analysis thermal balance equation (2) is used to determine the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature again: infinitesimal analysis thermal balance equation (2) is
Wherein
A (T)=aT
4+ bT
3+ cT
2+ dT+e; To make in coordinate axis thermal loss power and temperature curve under different electrical heating power be tending towards overlapping, determine coefficient a, b, c, d, e, matching is carried out to the thermal loss power being tending towards overlapping and temperature curve and can obtain thermal loss power relation equation q
loss(T
i); The thermal loss power relation equation q will obtained again
loss(T
i) with
addition can obtain the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature;
(3), the temperature data of lithium ion battery to be measured under charge or discharge condition is imported in data processing software, the thermal loss power of lithium ion battery thermal runaway detecting and analysing system obtained according to step (2) and the relation equation of temperature calculate the thermal loss power of lithium ion battery to be measured in section sometime, the thermal loss power calculated is updated in infinitesimal analysis thermal balance equation (3), obtain the heat generation rate sometime in section of lithium ion battery to be measured in charge or discharge process, again the heat generation rate in each time period of lithium ion battery to be measured is imported in data processing software, obtain the relation curve of charge or discharge heat generation rate and time and the total heat-dissipating amount of charge or discharge process lithium ion battery to be measured.
The lithium ion battery thermal runaway detecting and analysing system (application number 2014107135245 that the present invention adopts applicant to apply for, publication No. CN104330743A) gather temperature data under lithium ion battery electrical heating to be measured and discharge and recharge condition, this lithium ion battery thermal runaway detecting and analysing system comprises experimental provision, proving installation, electric heater unit, charging device, electric discharge device, data acquisition and processing system; Described experimental provision comprises heat pipe and heat-insulation system; Described heat pipe outer wall is wound around resistance wire, and described heat pipe is embedded in heat-insulation system, and heat pipe inner chamber forms lithium ion battery mounting hole for installing lithium ion battery to be measured, and described heat pipe top is provided with temperature sensor fixing hole for mounting temperature sensor; Described heat-insulation system is made up of the high-temperature-resistant thermal-insulation layer in container and container; Described proving installation comprises temperature sensor, and described temperature sensor is arranged in the temperature sensor fixing hole of experimental provision; Described electric heater unit comprises the resistance wire in the first D.C. regulated power supply and experimental provision, and the first described D.C. regulated power supply connects and composes electric heater unit through electrical lead and resistance wire; Described charging device is the second D.C. regulated power supply, and the both positive and negative polarity of lithium ion battery to be measured is connected with the second D.C. regulated power supply through electrical lead; Described electric discharge device is electric discharge resistance wire, and the both positive and negative polarity of lithium ion battery to be measured is connected with electric discharge resistance wire two ends through electrical lead; Described data acquisition and processing system comprises multi-Channels Data Acquisition and data analysis software; Described multi-Channels Data Acquisition is connected to come image data with temperature sensor, and transfers data to data analysis software and carry out treatment and analysis.Be provided with resistance wire stationary installation outside described resistance wire, resistance wire stationary installation is made up of the high-temperature plastic cloth of uniform winding outside resistance wire; Described resistance wire is provided with resistance wire access point in heat pipe upper end, is provided with resistance wire picks out a little in heat pipe lower end; Described heat pipe is copper pipe, and the intracavity bottom of heat pipe is provided with and hooks angle, and the profile of the inner chamber of described heat pipe is convex-down; Described heat pipe internal diameter is 18mm, and external diameter is 26mm, and height is 68mm; The length at described hook angle is 1mm, height is 3mm; Described temperature sensor is thermopair, and the aperture of described temperature sensor fixing hole is 2mm, is convenient to temperature sensor and directly inserts in temperature sensor fixing hole; Described container is iron cylindrical container; The material of described high-temperature-resistant thermal-insulation layer is alumina silicate fibre blanket or rock cotton board.The adjustable voltage scope of the first D.C. regulated power supply of described electric heater unit is 0 ~ 30V, electric current 0 ~ 5A.Described multi-Channels Data Acquisition is Hydra2620A multi-Channels Data Acquisition; Described data analysis software is Hydra Series Universal signal analysis software, for carrying out treatment and analysis to data and signal.
Under gathering different electrical heating power, the method for operating of the temperature data of lithium ion battery to be measured is: before experiment, and in experimental provision, the resistance wire access point of resistance wire and resistance wire pick out and a little connect and compose electric heater unit through the both positive and negative polarity of electrical lead and the first D.C. regulated power supply respectively; During experiment, be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, opens temperature acquisition software, checks that whether each passage is in running order, waiting signal; Then, the electrical heating power setting the first D.C. regulated power supply, between 3 ~ 10W, starts heating, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of data collecting instrument fixed time intervals acquisition and recording lithium ion battery to be measured.The reason of electrical heating power between 3 ~ 10W setting the first D.C. regulated power supply is: if electrical heating power setting is too high, the temperature variation collected is very fast, and the transmission life period of heat is poor, causes collecting temperature data and there is comparatively big error with actual temperature; Electrical heating power setting is too low, causes experimental period longer on the one hand, and temperature data changed slowly on the other hand, and the error of evaluation method also can be caused relatively to increase.Preferably, the electrical heating power setting the first D.C. regulated power supply is 3.3W, 5.6W, 7.3W, 9.1W, the data collecting instrument of lithium ion battery thermal runaway detecting and analysing system, every the temperature data of 1-3 acquisition and recording second lithium ion battery to be measured, obtains the temperature data of lithium ion battery to be measured under 4 groups of different electrical heating powers.
Under gathering different charge condition, the method for operating of the temperature data of lithium ion battery to be measured is: before experiment, and in experimental provision, the both positive and negative polarity of lithium ion battery to be measured is connected with the second D.C. regulated power supply through electrical lead; During experiment, be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, opens temperature acquisition software, checks that whether each passage is in running order, waiting signal; Then, if the charging current of the second D.C. regulated power supply is between 5 ~ 11A, start charging, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of data collecting instrument fixed time intervals acquisition and recording lithium ion battery to be measured.Preferably, if the charging current of the second D.C. regulated power supply is 5.2A, 7.8A, 9.1A, 9.8A, 10.4A, the data collecting instrument of lithium ion battery thermal runaway detecting and analysing system, every the temperature data of 1-3 acquisition and recording second lithium ion battery to be measured, obtains the temperature data of lithium ion battery to be measured under 5 groups of different charge conditions.The reason of charging current between 5 ~ 11A setting the second D.C. regulated power supply is: if charging current setting is too high, the temperature variation collected is very fast, and the transmission life period of heat is poor, causes collecting temperature data and there is comparatively big error with actual temperature; Charging current setting is too low, causes experimental period longer on the one hand, and temperature data changed slowly on the other hand, and the error of evaluation method also can be caused relatively to increase.
Under gathering different discharging condition, the method for operating of the temperature data of lithium ion battery to be measured is: be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, open temperature acquisition software, check that whether each passage is in running order, waiting signal; Then, the both positive and negative polarity of lithium ion battery to be measured is connected with electric discharge resistance wire two ends through electrical lead, the size of discharge resistance sets discharge resistance between 0.1 ~ 1.5 Ω by the length of adjustment access resistance wire, start electric discharge, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of data collecting instrument fixed time intervals acquisition and recording lithium ion battery to be measured.Preferably, the length setting discharge resistance of adjustment electric discharge resistance wire is 0.1 Ω, 0.2 Ω, 0.3 Ω, 0.5 Ω, 1.5 Ω, the data collecting instrument of lithium ion battery thermal runaway detecting and analysing system, every the temperature data of 1-3 acquisition and recording second lithium ion battery to be measured, obtains the temperature data of lithium ion battery to be measured under 5 groups of different discharging conditions.The reason of setting discharge resistance between 0.1 ~ 1.5 Ω is: if discharge resistance setting is too high or too low, experimental period all can be caused longer, and temperature data changed slowly, caused the error of evaluation method relatively to increase.
Described data processing software is the data processing software with matching function, is simulated the relation equation of temperature and thermal loss power by the nonlinear fitting function of data processing software.Described data processing software is preferably origin8.0.
Described infinitesimal analysis thermal balance equation (1) is:
q
loss,i(t
i+Δt-t
i)＝q
in(t
i+Δt-t
i)-c
p,cum
cu(T
i+Δt-T
i)-c
p1,batterym
battery1(T
i+Δt-T
i)；
Wherein, q
loss, i(t
i+ Δ t-t
i) represent q
loss, i* (t
i+ Δ t-t
i) i.e. section t sometime
i~ t
i+ Δ tthe thermal loss power of interior lithium ion battery thermal runaway detecting and analysing system was multiplied with this time period, q
loss, isection t sometime
i~ t
i+ Δ tthe thermal loss power of interior lithium ion battery thermal runaway detecting and analysing system, t
ithe time point of i-th temperature data collected, t
i+ △ tthe time point of the i-th+△ t temperature data collected, T
ii-th temperature data collected, T
i+ Δ tthe i-th+△ t temperature data collected, q
inelectrical heating power, c
p, cuthe specific heat of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
cuthe quality of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, c
p1, batterythe specific heat of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
battery1it is the quality of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision.
Described infinitesimal analysis thermal balance equation (2) is:
lithium ion battery thermal runaway detecting and analysing system q in equation
lossthermal loss power comprise two parts q
loss(T
i) and
wherein, q
loss(T
i) be that system temperature raises the thermal loss power brought, and the q under different electrical heating condition
los(
st
i) equal;
when being discharge and recharge, battery temperature raises the thermal loss power brought,
a (T)=aT
4+ bT
3+ cT
2+ dT+e, wherein A (T) makes lithium ion battery thermal runaway detecting and analysing system under different electrical heating power be tending towards the formula that overlaps due to thermal loss power that temperature variation is brought for usage data process software.
Described infinitesimal analysis thermal balance equation (3) is:
q
reaction＝c
p,cum
cu(T
i+Δt-T
i)+c
p1,batterym
battery1(T
i+Δt-T
i)+q
loss
Wherein, q
reactionthe heat generation rate in battery charge and discharge process, c
p, cuthe specific heat of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
cuthe quality of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, c
p1, batterythe specific heat of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
battery1the quality of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision, T
ii-th temperature data collected, T
i+ Δ tthe i-th+△ t temperature data collected, q
lossfor the thermal loss power of lithium ion battery thermal runaway detecting and analysing system, the thermal loss power of the lithium ion battery thermal runaway detecting and analysing system namely obtained according to infinitesimal analysis thermal balance equation (2).
Under discharge and recharge condition of the present invention, lithium ion battery heat-dissipating amount refers to the heat that lithium ion battery produces at charge and discharge process.
Beneficial effect of the present invention:
The inventive method is overall as research object using lithium ion battery, based on the experimental data that lithium ion battery thermal runaway detecting and analysing system records, by carrying out a series of process to data, and battery heat-dissipating amount relatively accurate under obtaining discharge and recharge condition.By setting different discharge and recharge condition, with it corresponding raw amount of heat can be estimated, clearly realizing that discharge and recharge condition affects size to battery.
Accompanying drawing explanation
Fig. 1 is the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the graph of relation of temperature.
Fig. 2 is lithium ion battery thermal runaway detecting and analysing system q
loss(T
i) with the graph of relation of temperature.
Fig. 3 is the schematic diagram of lithium ion battery thermal runaway detecting and analysing system.
Fig. 4 is the experimental provision structural representation of lithium ion battery thermal runaway detecting and analysing system.
Fig. 5 is heat pipe structural representation in the experimental provision of lithium ion battery thermal runaway detecting and analysing system.
Embodiment
By embodiment, technical scheme of the present invention is described further.
With reference to shown in Fig. 3-5, the lithium ion battery thermal runaway detecting and analysing system (application number 2014107135245, publication No. CN104330743A) that the present invention adopts comprises experimental provision, electric heater unit, charging device, electric discharge device, proving installation, data acquisition and processing system; Described experimental provision comprises heat pipe 3 and heat-insulation system; Be provided with bottom described heat pipe 3 and hook angle 9, make the profile of heat pipe 3 be convex-down; Described heat pipe 3 outer wall is wound around resistance wire 4, and described resistance wire 4 is respectively equipped with resistance wire access point 10 and resistance wire at heat pipe 3 upper and lower end and picks out a little 11; The described high temperature resistant adhesive plaster of the outer uniform winding of resistance wire 4 is as resistance wire stationary installation 5, described heat pipe 3 is embedded in heat-insulation system, heat pipe 3 inner chamber forms lithium ion battery mounting hole 1 for installing lithium ion battery to be measured, and described heat pipe 3 top is provided with temperature sensor fixing hole 2 for mounting temperature sensor 7; Described heat-insulation system comprises the high-temperature-resistant thermal-insulation layer 6 that iron cylindrical container 8 is formed with the exotic material be filled in container 8 (the present embodiment adopts heat-preservation cotton as exotic material); Wherein, described heat pipe 3 is copper pipe; Described heat pipe 3 internal diameter is 18mm, and external diameter is 26mm, and height is 68mm; The length at described hook angle 9 is 1mm, height is 3mm.
Described electric heater unit comprises the resistance wire in the first D.C. regulated power supply (30V5A) and experimental provision, and the first described D.C. regulated power supply is connected with resistance wire through electrical lead.The first described D.C. regulated power supply is WYJ-5A30V type D.C. regulated power supply, and its adjustable voltage scope is 0 ~ 30V, display accuracy ± 1.2%, electric current 0 ~ 5A, display accuracy ± 1.5%.
Described charging device is the second D.C. regulated power supply (30V50A), and the both positive and negative polarity of lithium ion battery to be measured is connected with the second D.C. regulated power supply through electrical lead.The second described D.C. regulated power supply is KXN-3050D type D.C. regulated power supply, and its adjustable voltage scope is 0 ~ 30V, display accuracy ± 1%, electric current 0 ~ 50A, display accuracy ± 1%.
Described electric discharge device is electric discharge resistance wire, and the both positive and negative polarity of lithium ion battery to be measured is connected with electric discharge resistance wire two ends through electrical lead.Electric discharge resistance wire in described electric discharge device is Cr
20ni
80type resistance wire, adjustable resistance scope is 0 ~ 5 Ω.
Described temperature sensor is OMEGA-K type thermopair, its response time 0.01s, the installation of TC in the temperature sensor fixing hole of experimental provision, for gathering lithium ion battery temperature to be measured.
Described data acquisition and processing system comprises multi-Channels Data Acquisition and data analysis software; Described multi-Channels Data Acquisition is connected image data with temperature sensor, and transfers data to data analysis software and carry out treatment and analysis.In the present embodiment, multi-Channels Data Acquisition is Hydra2620A multi-Channels Data Acquisition, and resolution is 0.1 DEG C, and accuracy is ± 0.45 DEG C; Described data analysis software is Hydra Series Universal signal analysis software; Multi-Channels Data Acquisition is connected image data with temperature sensor, and transfers data to data analysis software and carry out treatment and analysis.
Embodiment 1
The variable of charge condition is charging current, and remaining initial temperature and radiating condition are invariant.Unified capacity of selecting is the lithium ion battery of 2600mAh, and initial quantity of electricity is 0%, and charging current is followed successively by 5.2A, 7.8A, 9.1A, 9.8A, 10.4A.Initial temperature is 23 DEG C.
With reference to the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition in technical scheme, the heat-dissipating amount under the present embodiment lithium ion cell charging condition to be measured is estimated, comprises the following steps:
(1) temperature data under, adopting lithium ion battery thermal runaway detecting and analysing system to gather the different electrical heating condition of lithium ion battery to be measured, method of operating is: before experiment, and in experimental provision, the resistance wire access point of resistance wire and resistance wire pick out and a little connect and compose electric heater unit through the both positive and negative polarity of electrical lead and the first D.C. regulated power supply respectively; During experiment, be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, opens temperature acquisition software, checks that whether each passage is in running order, waiting signal; The electrical heating power setting the first D.C. regulated power supply is respectively 3.3W, 5.6W, 7.3W, 9.1W, carry out 4 groups of experiments, after electrical heating power has set, start heating, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, data collecting instrument gathered the temperature data of a temperature data record lithium ion battery to be measured every 1 second;
Temperature data under adopting lithium ion battery thermal runaway detecting and analysing system to gather the different charge condition of lithium ion battery to be measured, method of operating is: before experiment, and in experimental provision, the both positive and negative polarity of lithium ion battery to be measured is connected with the second D.C. regulated power supply through electrical lead; During experiment, be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, opens temperature acquisition software, checks that whether each passage is in running order, waiting signal; Then, set the charging current of the second D.C. regulated power supply as 5.2A, 7.8A, 9.1A, 9.8A, 10.4A respectively, carry out 5 groups of experiments, after charging current has set, start charging, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of the 1 second acquisition and recording lithium ion battery to be measured in data collecting instrument interval.
(2), the temperature data under 4 of lithium ion battery to be measured groups of different electrical heating powers is imported in data processing software origin8.0 respectively, use infinitesimal analysis thermal balance equation (1) treatment temperature data, obtain the thermal loss power in section (the present embodiment is 2 seconds) sometime, again the mean value of temperature in this time period and thermal loss power are carried out matching, draw the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature under a certain electrical heating power; Take temperature as X-axis, thermal loss power is Y-axis, the thermal loss power obtain the thermal loss power of lithium ion battery thermal runaway detecting and analysing system under 4 groups of different electrical heating powers and the relation unification of temperature in same coordinate axis under 4 different electrical heating powers and the relation curve (as Fig. 2) of temperature;
Wherein, described infinitesimal analysis thermal balance equation (1) is:
q
loss,i(t
i+Δt-t
i)＝q
in(t
i+Δt-t
i)-c
p,cum
cu(T
i+Δt-T
i)-c
p1,batterym
battery1(T
i+Δt-T
i)；
Wherein, q
loss, isection t sometime
i~ t
i+ Δ tthe thermal loss power of interior lithium ion battery thermal runaway detecting and analysing system, t
ithe time of i-th temperature data collected, some t
i+ △ tthe time point of the i-th+△ t temperature data collected, T
ii-th temperature data collected, T
i+1the i-th+△ t temperature data collected, q
inelectrical heating power (q in the present embodiment
in=3.3W, 5.6W, 7.3W, 9.1W), c
p, cuthe specific heat (c in the present embodiment of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision
p, cu=316.21+0.3177T-3.4936*10
-4t
2+ 1.661*10
-7t
3), m
cuthe quality (m in the present embodiment of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision
cu=133.38g), c
p1, batterythe specific heat (c in the present embodiment of lithium ion battery battery to be measured
p1, battery=1160J/ (g*K)), m
battery1the quality (m in the present embodiment of lithium ion battery battery to be measured
battery1=45.03g).
Use infinitesimal analysis thermal balance equation (2):
Wherein,
A (T)=aT
4+ bT
3+ cT
2+ dT+e; Thermal loss power under 4 different electrical heating powers and the relation curve of temperature are tending towards overlap (Fig. 3 is shown in concrete matched curve), obtain a=-2 × 10
-8, b=6.4 × 10
-5, c=1.1 × 10
-2, d=0.84, e=-5.5.Matching is carried out to the curve being tending towards overlapping and obtains thermal loss power q
loss(T
i) relation equation; Again by q
loss(T
i) with
addition can obtain the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature:
(3) under lithium ion battery thermal runaway detecting and analysing system thermal loss power charge condition different from 5 groups the relation equation of temperature (5.2A, 7.8A, 9.1A, 9.8A, 10.4A), step (2) obtained, the temperature data of lithium ion battery to be measured substitutes into infinitesimal analysis thermal balance equation (3): q
reaction=c
p, cum
cu(T
i+ Δ t-T
i)+c
p1, batterym
battery1(T
i+ Δ t-T
i)+q
lossin, draw the heat generation rate sometime in section (the present embodiment is 2 seconds) of lithium ion battery to be measured in charging process;
Wherein, q
reactionthe heat generation rate in lithium ion cell charging process to be measured, c
p, cuthe specific heat of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
cuthe quality of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, c
p1, batterythe specific heat of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
battery1the quality of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision, T
ii-th temperature data collected, T
i+ Δ tthe i-th+△ t temperature data collected, q
lossfor the thermal loss power of lithium ion battery thermal runaway detecting and analysing system.
Again the heat generation rate in each time period of lithium ion battery to be measured is imported in data processing software origin8.0, the heat-dissipating amount that under obtaining different charge condition, lithium ion battery to be measured is total, as shown in table 1.
The heat-dissipating amount of lithium ion battery to be measured under the different charging current of table 1
Embodiment 2
Select the lithium ion battery to be measured in embodiment 1, capacity is the lithium ion battery of 2600mAh, initial quantity of electricity is 100%, and discharge resistance is followed successively by 0.1 Ω, 0.2 Ω, 0.3 Ω, 0.5 Ω, 1.5 Ω, estimates the heat-dissipating amount of lithium ion battery under different discharge resistance.
With reference to the evaluation method of example 1, except the method for operating difference of the temperature data of lithium ion battery to be measured under the different discharging condition of collection in step (1), other steps are all consistent.Under gathering different discharging condition, the method for operating of the temperature data of lithium ion battery to be measured is: be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, open temperature acquisition software, check that whether each passage is in running order, waiting signal; Then, the both positive and negative polarity of lithium ion battery to be measured is connected with electric discharge resistance wire two ends through electrical lead, the size of discharge resistance sets discharge resistance by the length of adjustment access resistance wire and is respectively 0.1 Ω, 0.2 Ω, 0.3 Ω, 0.5 Ω, 1.5 Ω, start electric discharge, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of the 1 second acquisition and recording lithium ion battery to be measured in data collecting instrument interval, obtains the temperature data of lithium ion battery to be measured under 5 groups of different discharging conditions.Under finally obtaining different discharge resistance, the heat-dissipating amount of lithium ion battery to be measured, as shown in table 2.
The heat-dissipating amount of lithium ion battery to be measured under the different discharge resistance of table 2
Claims (10)
1. an evaluation method for lithium ion battery heat-dissipating amount under discharge and recharge condition, is characterized in that comprising the following steps:
(1) lithium ion battery thermal runaway detecting and analysing system, is utilized to gather the temperature data of lithium ion battery to be measured under the temperature data of lithium ion battery to be measured under different charge or discharge condition and different electrical heating power;
(2), the temperature data of the lithium ion battery to be measured collected under different electrical heating power in step (1) is imported in data processing software respectively, use infinitesimal analysis thermal balance equation (1) treatment temperature data, obtain the thermal loss power in section sometime, again the mean value of temperature in this time period and thermal loss power are carried out matching, draw the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature under a certain electrical heating power; Take temperature as X-axis, thermal loss power is Y-axis, by unified in same coordinate axis for the relation of the thermal loss power of lithium ion battery thermal runaway detecting and analysing system under different electrical heating power and temperature;
Infinitesimal analysis thermal balance equation (2) is used to determine the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature again: infinitesimal analysis thermal balance equation (2) is
wherein
a (T)=aT
4+ bT
3+ cT
2+ dT+e; To make in coordinate axis thermal loss power and temperature curve under different electrical heating power be tending towards overlapping, determine coefficient a, b, c, d, e, matching is carried out to the thermal loss power being tending towards overlapping and temperature curve and can obtain thermal loss power relation equation q
loss(T
i); The thermal loss power relation equation q will obtained again
loss(T
i) with
addition can obtain the thermal loss power of lithium ion battery thermal runaway detecting and analysing system and the relation equation of temperature;
(3), the temperature data of lithium ion battery to be measured under charge or discharge condition is imported in data processing software, the thermal loss power of lithium ion battery thermal runaway detecting and analysing system obtained according to step (2) and the relation equation of temperature calculate the thermal loss power of lithium ion battery to be measured in section sometime, the thermal loss power calculated is updated in infinitesimal analysis thermal balance equation (3), obtain the heat generation rate sometime in section of lithium ion battery to be measured in charge or discharge process, again the heat generation rate in each time period of lithium ion battery to be measured is imported in data processing software, obtain the relation curve of charge or discharge heat generation rate and time and the total heat-dissipating amount of charge or discharge process lithium ion battery to be measured.
2. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 1, under it is characterized in that gathering different electrical heating power, the method for operating of the temperature data of lithium ion battery to be measured is: before experiment, and in experimental provision, the resistance wire access point of resistance wire and resistance wire pick out and a little connect and compose electric heater unit through the both positive and negative polarity of electrical lead and the first D.C. regulated power supply respectively; During experiment, be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, opens temperature acquisition software, checks that whether each passage is in running order, waiting signal; Then, the electrical heating power setting the first D.C. regulated power supply, between 3 ~ 10W, starts heating, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of data collecting instrument fixed time intervals acquisition and recording lithium ion battery to be measured.
3. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 2, is characterized in that the temperature data of the data collecting instrument of lithium ion battery thermal runaway detecting and analysing system every 1-3 acquisition and recording second mesuring battary.
4. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 1, under it is characterized in that gathering different charge condition, the method for operating of the temperature data of lithium ion battery to be measured is: before experiment, and in experimental provision, the both positive and negative polarity of lithium ion battery to be measured is connected with the second D.C. regulated power supply through electrical lead; During experiment, be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, opens temperature acquisition software, checks that whether each passage is in running order, waiting signal; Then, if the charging current of the second D.C. regulated power supply is between 5 ~ 11A, start charging, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of data collecting instrument fixed time intervals acquisition and recording lithium ion battery to be measured.
5. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 4, is characterized in that the temperature data of the data collecting instrument of lithium ion battery thermal runaway detecting and analysing system every 1-3 acquisition and recording second lithium ion battery to be measured.
6. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 1, under it is characterized in that gathering different discharging condition, the method for operating of the temperature data of lithium ion battery to be measured is: be embedded into by lithium ion battery to be measured in lithium ion battery mounting hole, temperature sensor embeds in temperature sensor fixing hole, open temperature acquisition software, check that whether each passage is in running order, waiting signal; Then, the both positive and negative polarity of lithium ion battery to be measured is connected with electric discharge resistance wire two ends through electrical lead, the size of discharge resistance sets discharge resistance between 0.1 ~ 1.5 Ω by the length of adjustment access resistance wire, start electric discharge, by temperature sensor measurement temperature signal, and by signal transmission to data collecting instrument, the temperature data of data collecting instrument fixed time intervals acquisition and recording lithium ion battery to be measured.
7. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 6, is characterized in that the temperature data of the data collecting instrument of lithium ion battery thermal runaway detecting and analysing system every 1-3 acquisition and recording second lithium ion battery to be measured.
8. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 1, is characterized in that described data processing software is origin8.0.
9. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 1, is characterized in that described infinitesimal analysis thermal balance equation (1) is:
q
loss,i(t
i+Δt-t
i)＝q
in(t
i+Δt-t
i)-c
p,cum
cu(T
i+Δt-T
i)-c
p1,batterym
battery1(T
i+Δt-T
i)；
Wherein, q
loss, isection t sometime
i~ t
i+ Δ tthe thermal loss power of interior lithium ion battery thermal runaway detecting and analysing system, t
ithe time point of i-th temperature data collected, t
i+ △ tthe time point of the i-th+△ t temperature data collected, T
ii-th temperature data collected, T
i+ Δ tthe i-th+△ t temperature data collected, q
inelectrical heating power, c
p, cuthe specific heat of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
cuthe quality of copper pipe in lithium ion battery thermal runaway detecting and analysing system experimental provision, c
p1, batterythe specific heat of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision, m
battery1it is the quality of lithium ion battery in lithium ion battery thermal runaway detecting and analysing system experimental provision.
10. the evaluation method of lithium ion battery heat-dissipating amount under discharge and recharge condition according to claim 1, is characterized in that described infinitesimal analysis thermal balance equation (3) is: q
reaction=c
p, cum
cu(T
i+ Δ t-T
i)+c
p1, batterym
battery1(T
i+ Δ t-T
i)+q
loss;
Wherein, q
reactionthe heat generation rate in battery charge and discharge process, c
p, cuthe specific heat of copper pipe in lithium ion battery battery heating experimental device, m
cuthe quality of copper pipe in lithium ion battery battery heating experimental device, c
p1, batterythe specific heat of lithium ion battery in lithium ion battery battery heating experimental device, m
battery1the quality of lithium ion battery in lithium ion battery battery heating experimental device, T
ii-th temperature data collected, T
i+ Δ tthe i-th+△ t temperature data collected, q
lossfor the thermal loss power of lithium ion battery thermal runaway detecting and analysing system.
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