CN103995232B - A kind of detection method of lithium iron phosphate dynamic battery group peak value charge-discharge performance - Google Patents
A kind of detection method of lithium iron phosphate dynamic battery group peak value charge-discharge performance Download PDFInfo
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Abstract
The invention discloses the detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance, comprise the following steps: first, with constant current, lithium iron phosphate dynamic battery group is carried out discharge and recharge and carry out pretreatment, lithium iron phosphate dynamic battery group is adjusted to preferable state；Then, the lithium iron phosphate dynamic battery group peak point current utilizing producer to specify carries out discharge and recharge test to set of cells, and records the open-circuit voltage of lithium iron phosphate dynamic battery group in discharge and recharge process of the test；Finally, by calculating the voltage drop of lithium iron phosphate dynamic battery group discharge and recharge, calculate the internal resistance of set of cells, thus judge the performance of set of cells peak value discharge and recharge.The detection method evaluation used in the present invention is accurate, it is workable to produce, and is effectively increased the peak point current charge-discharge performance evaluating ferric phosphate lithium cell group, has significant Practical significance.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly relate to a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance
Detection method.
Background technology
Along with the quickening of urbanization Yu auto industry process, air environmental pollution increasingly sharpens the day by day exhausted lance with petroleum resources
Shield is more and more prominent, and new-energy automobile be it is believed that it is to solve above-mentioned contradiction and realize the optimum selection of automobile industry transition and upgrade.
And in new-energy automobile energy source, lithium ion battery has discharge voltage height, energy or power density height, circulation because of it
The many advantages such as life-span length, high temperature performance are excellent, environmental protection become of paramount importance energy storage device in Development of Electric Vehicles.
In actual applications, need multiple monomer lithium ion batteries are carried out series/parallel, obtain required high voltage, high power capacity
Set of cells.Wherein whether set of cells has moment to export powerful performance is very important, is usually and it is carried out peak value charge and discharge
Electricity checks this performance.Judge that the parameter of this function has: voltage before and after peak point current, big electric current, electric discharge, the internal resistance of cell.
At present, lithium manganate power battery and lithium iron phosphate dynamic battery are the main Types being applied on electric automobile.And iron phosphate
Lithium battery occupies electric automobile power battery because of excellent properties such as its voltage platform are stable, safety is high and has extended cycle life
Staple market.
The peak value charge-discharge performance of ferric phosphate lithium cell is tested except needing the peak point current specified with producer to detect, in addition it is also necessary to use
One electric current less than peak point current detects.Need battery to be charged, to reduce error with a small area analysis.
Technical problem is that sum it up, be presently required one that those skilled in the art urgently solve: how to change in prior art
The deficiency of LiFePO4 peak value charging/discharging thereof.
Summary of the invention
The purpose of the present invention is contemplated to solve the problems referred to above, it is provided that a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance
Detection method, it has the advantage exporting powerful ability with more real reaction cell group.
To achieve these goals, the present invention adopts the following technical scheme that
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance, comprises the following steps:
First, with constant current, lithium iron phosphate dynamic battery group is carried out discharge and recharge and carry out pretreatment, by lithium iron phosphate dynamic battery group
It is adjusted to optimal state to be detected；
Then, the lithium iron phosphate dynamic battery group peak point current utilizing producer to specify carries out discharge and recharge test, and record to set of cells
The open-circuit voltage of the lithium iron phosphate dynamic battery group in discharge and recharge process of the test；Lithium iron phosphate dynamic battery group is carried out recovery process；
Finally, by calculating the voltage drop of lithium iron phosphate dynamic battery group discharge and recharge, calculate the maximum electric discharge of producer's regulation
Electric current IpdThe maximum charge that the internal resistance of set of cells in electric discharge, the internal resistance calculating set of cells in big electric current I electric discharge and calculating producer specify
Electric current IpcThe internal resistance of set of cells in charging, judges that by calculated internal resistance the charge and discharge of lithium iron phosphate dynamic battery group is electrical
Energy.
Described pre-treatment step is as follows: in thermostatic chamber, and temperature is transferred to required ambient temperature T,
Step (1-1): under ambient temperature T, charges to monomer ceiling voltage by set of cells with 1C electric current and occurs 3.65～3.75V,
Stand 1 hour；
Step (1-2): under ambient temperature T, occurs 2.6～2.7V by set of cells with 1C current discharge to monomer minimum voltage,
Stand half an hour；
Step (1-3): under ambient temperature T, charges to monomer ceiling voltage by set of cells with 1C electric current and occurs 3.65～3.75V,
Stand one hour.
Preferably, described pre-treatment step is as follows: in thermostatic chamber, and temperature is transferred to required ambient temperature T,
Step (1-1): under ambient temperature T, by set of cells with 1C electric current charge to monomer ceiling voltage occur 3.7V(or
Regulation according to producer), stand 1 hour；
Step (1-2): under ambient temperature T, occurs 2.65V with 1C current discharge to monomer minimum voltage by set of cells, quiet
Put half an hour；
Step (1-3): under ambient temperature T, charges to monomer minimum voltage by set of cells with 1C electric current and 3.65V occurs, quiet
Put one hour.
The described lithium iron phosphate dynamic battery group peak point current utilizing producer to specify carries out discharge and recharge test to set of cells, and record fills
The open-circuit voltage step of the lithium iron phosphate dynamic battery group during discharge test is as follows:
Step (2): 1C constant-current discharge to 50%SOC, stood for the first setting time, record battery open circuit voltage OCV1 now；
The maximum discharge current I specified with producerpdElectric discharge 5s, records the OCV2 of now battery open circuit voltage, stands for the second setting time；
Step (3): 2A charges t1=(Ipd* 5/2) s, stood for the first setting time, record battery open circuit voltage OCV3 now,
Set of cells thermal balance；With big electric current I electric discharge 10s, record battery open circuit voltage OCV4 now, stood for the second setting time,
Set of cells thermal balance；
Step (4): 2A charges t2=(I*10/2) s, stood for the first setting time, record battery open circuit voltage OCV5 now,
Set of cells thermal balance；The maximum charging current I specified with producerpcCharging 10s, record battery open circuit voltage OCV6 now,
Set of cells thermal balance.
The big electric current of described step (3) be I be the maximum discharge current I that producer specifiespd80%.
The described step that lithium iron phosphate dynamic battery group carries out recovery process is consistent with the step of pretreatment.
The maximum discharge current I that described calculating producer specifiespdThe internal resistance R of set of cells in electric dischargepdMethod as follows:
Rpd=(OCV1-OCV2)/Ipd；
The internal resistance R of set of cells in described calculating big electric current I electric dischargeIMethod as follows:
RI=(OCV3-OCV4)/I；
The maximum charging current I that described calculating producer specifiespcThe internal resistance R of set of cells in chargingpcMethod as follows:
Rpc=(OCV6-OCV5)/Ipc。
The step of the described charge-discharge performance being judged lithium iron phosphate dynamic battery group by calculated internal resistance is:
If calculated internal resistance is more than or equal to 300m Ω, that is judged as the charge-discharge performance of lithium iron phosphate dynamic battery group for not
Qualified；
If calculated internal resistance is more than or equal to 250m Ω and less than 300m Ω, that is judged as lithium iron phosphate dynamic battery group
Charge-discharge performance is qualified；
If calculated internal resistance is less than 250m Ω, that charge-discharge performance being judged as lithium iron phosphate dynamic battery group is excellent.
Described first set the time as 30 minutes；Described second set the time as 5 minutes.
Beneficial effects of the present invention
1) constant-current charge is utilized to carry out preliminary experiment before experiment, it is ensured that to guarantee that the voltage concordance testing front battery is good, and energy
Guarantee battery is charged to a rational level of comparison.
2) detection method of the peak point current charge-discharge performance employed in the present invention, the complete electric current being charged of each discharge test
Less, can effectively battery capacity be increased to the level before electricity, the charging interval is also relatively rationally.Test period is relatively more reasonable,
Do not interfere with the battery entrucking progress of enterprise.
3) heavy-current discharge through two levels is tested and peak value charge test, can effectively judge that the peak power of battery is defeated
Go out performance, just can effectively judge the performance of battery according to the internal resistance of cell.
4) the detection method evaluation used in the present invention is accurate, workable, test period is shorter, effectively raises electricity
The judgement of pond peak point current charge-discharge performance, has significant Practical significance.
5) step 1) and step 5) broadly fall into is the pretreatment to battery, can because carrying out doing the battery state in which tested
Trystate can not met, for the accuracy of result of the test, carry out pretreatment before the test, battery is adjusted to an ideal
State, equally, be also required to after off-test battery is carried out pretreatment, meet the requirement next time tested.
6) 1. in the step that battery is carried out pretreatment, namely step 1) and step 5), select just set of cells with 1C
Electric current charges to monomer ceiling voltage and occurs 3.65～3.75V, and 1C current discharge to monomer minimum voltage occurs 2.6～2.7V.Mesh
Be in order in the case of meeting experimental accuracy, it is also possible to battery will not be caused and overcharge or cross the infringement put, general battery
Group effective traffic coverage be between dump energy 30%～80%, 2.6～2.7V and 3.65～3.75V both in this valid interval,
And the actual performance of battery can be reflected more accurately.Most bus and coach enterprise are the abilities not having autonomous production battery, electricity
Pond is bought often, therefore does experiment and should meet accuracy, cannot cause damage battery again, because this battery is past
Contact is intended to what entrucking used, a namely cost-effective theory.Experimental condition selects two above numerical value, is i.e.
For the consideration of this respect, the requirement of test can be met, can be continuing with again.
2. maximum discharge current IpdAfter electric discharge 5s, selection 2A charges t1=(Ipd* 5/2) s.The reason selecting 2A is to be this
Numerical value is not the most the least, less can be time-consuming, does not results in the biggest caloric value, it is to avoid temperature rise is excessive simultaneously, makes
Become internal resistance in charging process excessive, interfere carrying out second horizontal heavy-current discharge test.Select charging interval t1=(Ipd
* 5/2) s, is to ensure that the capacity being charged in theory and maximum discharge current IpdThe capacity released during electric discharge 5s is one
Cause.Proving through substantial amounts of test, the selection of two numerical value herein is very rationally effective, OCV1 with OCV3 differs nothing
Several, basic it is believed that the capacity that is charged into small area analysis of capacity that maximum discharge current is released is consistent, it is ensured that to carry out the
The experimental condition of two big electric currents of level is substantially coincident with the experiment condition carrying out maximum discharge current.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the present invention；
Fig. 2 is 250A discharge time-voltage curve schematic diagram；
Fig. 3 is 200A discharge time-voltage curve schematic diagram；
Fig. 4 is 150A charging interval-voltage curve.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As it is shown in figure 1, example: the set of cells of one 2 and 112 string totally 224 cells is carried out peak value discharge and recharge test,
Capacity is 16Ah.In calorstat, it is T=0 DEG C in temperature, tests the most according to the following steps at 20 DEG C and 40 DEG C:
(1) at temperature, set of cells is charged to monomer ceiling voltage with 1C electric current 3.7V occurs, stand 1 hour.
(2) at room temperature, is there is 2.65V with 1C current discharge to monomer minimum voltage in set of cells, stand half an hour.
(3) at room temperature, set of cells is charged to monomer minimum voltage with 1C electric current 3.65V occurs, stand one hour.
(4) 1C constant-current discharge is to 50%SOC, stands 30min, record battery open circuit voltage OCV1=367.6V now.
(5) with 250A (peak discharge current that producer specifies) electric discharge 5s, record OCV2=307.5V now, 5min is stood.
(6) 2A charging 625s, stands 30min, record battery open circuit voltage OCV3=368.6 now, set of cells thermal balance.
(7) 200 electric discharge 10s, record battery open circuit voltage OCV4=312.7 now, stand 5min, set of cells thermal balance.
(8) 2A charging 1000s, records the open-circuit voltage OCV5=368V of now set of cells, stands 30min, set of cells thermal balance.
(9) peak charging current specified with 150A(producer) charging 10s, record the open-circuit voltage OCV6=413.8V of now set of cells,
Set of cells thermal balance.
(10) at room temperature, set of cells is charged to monomer ceiling voltage with 1C electric current 3.7V occurs, stand 1 hour.
(11) at room temperature, is there is 2.65V with 1C current discharge to monomer minimum voltage in set of cells, stand half an hour.
(12) at room temperature, set of cells is charged to monomer minimum voltage with 1C electric current 3.65V occurs, stand one hour.
(13) internal resistance of set of cells, R in 250A electric discharge are calculatedpd=(OCV1-OCV2)/Ipd=0.24Ω=240mΩ
(14) internal resistance of set of cells, R in 200A electric discharge are calculatedI=(OCV3-OCV4)/I=0.28 Ω=280m Ω
(15) internal resistance of set of cells, R in 150A charging are calculatedpc=(OCV6-OCV5)/Ipc=0.31Ω=310mΩ
(16) judge that set of cells exports powerful performance according to the set of cells internal resistance calculated.
According to table
| Internal resistance value | R≥300mΩ | 250m Ω≤R ＜ 300m Ω | R ＜ 250m Ω |
| Criterion | Defective | Qualified | Excellent |
Can determine whether out, this set of cells is the most qualified.
As in figure 2 it is shown, show 250A discharge time-voltage curve, can be clearly seen that from this figure and discharged at 250A
The change of battery voltage in journey.
As it is shown on figure 3, show 200A discharge time-voltage curve, can be clearly seen that from this figure and discharged at 200A
The change of battery voltage in journey.
As shown in Figure 4, it show 150A charging interval-voltage curve, can be clearly seen that from this figure and charged at 150A
The change of battery voltage in journey.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope
System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay
Go out various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (9)
1. a detection method for lithium iron phosphate dynamic battery group peak value charge-discharge performance, is characterized in that, comprise the following steps:
First, with constant current, lithium iron phosphate dynamic battery group is carried out discharge and recharge and carry out pretreatment, by lithium iron phosphate dynamic battery group
It is adjusted to optimal state to be detected；
Then, the lithium iron phosphate dynamic battery group peak point current utilizing producer to specify carries out discharge and recharge test, and record to set of cells
The open-circuit voltage of the lithium iron phosphate dynamic battery group in discharge and recharge process of the test；Lithium iron phosphate dynamic battery group is carried out recovery process；
Finally, by calculating the voltage drop of lithium iron phosphate dynamic battery group discharge and recharge, the maximum discharge current that producer specifies is calculated
IpdThe maximum charging current that the internal resistance of set of cells in electric discharge, the internal resistance calculating set of cells in big electric current I electric discharge and calculating producer specify
IpcThe internal resistance of set of cells in charging, judges the charge-discharge performance of lithium iron phosphate dynamic battery group by calculated internal resistance.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 1, is characterized in that,
Described pre-treatment step is as follows: in thermostatic chamber, and temperature is transferred to required ambient temperature T,
Step (1-1): under ambient temperature T, charges to monomer ceiling voltage by set of cells with 1C electric current and occurs 3.65～3.75V,
Stand 1 hour；
Step (1-2): under ambient temperature T, occurs 2.6～2.7V by set of cells with 1C current discharge to monomer minimum voltage,
Stand half an hour；
Step (1-3): under ambient temperature T, charges to monomer ceiling voltage by set of cells with 1C electric current and occurs 3.65～3.75V,
Stand one hour.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 1, is characterized in that,
Preferably, described pre-treatment step is as follows: in thermostatic chamber, and temperature is transferred to required ambient temperature T,
Step (1-1): under ambient temperature T, charges to monomer ceiling voltage by set of cells with 1C electric current and 3.7V occurs, quiet
Put 1 hour；
Step (1-2): under ambient temperature T, occurs 2.65V with 1C current discharge to monomer minimum voltage by set of cells, quiet
Put half an hour；
Step (1-3): under ambient temperature T, charges to monomer minimum voltage by set of cells with 1C electric current and 3.65V occurs, quiet
Put one hour.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 1, is characterized in that,
The described lithium iron phosphate dynamic battery group peak point current utilizing producer to specify carries out discharge and recharge test to set of cells, and records discharge and recharge
The open-circuit voltage step of the lithium iron phosphate dynamic battery group in process of the test is as follows:
Step (2): 1C constant-current discharge to 50%SOC, stood for the first setting time, record battery open circuit voltage OCV1 now；
The maximum discharge current I specified with producerpdElectric discharge 5s, records the OCV2 of now battery open circuit voltage, stands for the second setting time；
Step (3): 2A charges t1=(Ipd* 5/2) s, stood for the first setting time, record battery open circuit voltage OCV3 now,
Set of cells thermal balance；With big electric current I electric discharge 10s, record battery open circuit voltage OCV4 now, stood for the second setting time,
Set of cells thermal balance；
Step (4): 2A charges t2=(I*10/2) s, stands for the first setting time, record battery open circuit voltage OCV5 now,
Set of cells thermal balance；The maximum charging current I specified with producerpcCharging 10s, record battery open circuit voltage OCV6 now,
Set of cells thermal balance.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 4, is characterized in that,
The big electric current of described step (3) be I be the maximum discharge current I that producer specifiespd80%.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 1, is characterized in that,
The described step that lithium iron phosphate dynamic battery group carries out recovery process is consistent with the step of pretreatment.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 4, is characterized in that,
The maximum discharge current I that described calculating producer specifiespdThe internal resistance R of set of cells in electric dischargepdMethod as follows:
Rpd=(OCV1-OCV2)/Ipd；
The internal resistance R of set of cells in described calculating big electric current I electric dischargeIMethod as follows:
RI=(OCV3-OCV4)/I；
The maximum charging current I that described calculating producer specifiespcThe internal resistance R of set of cells in chargingpcMethod as follows:
Rpc=(OCV6-OCV5)/Ipc。
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 1, is characterized in that,
The step of the described charge-discharge performance being judged lithium iron phosphate dynamic battery group by calculated internal resistance is:
If calculated internal resistance is more than or equal to 300m Ω, that is judged as the charge-discharge performance of lithium iron phosphate dynamic battery group for not
Qualified；
If calculated internal resistance is more than or equal to 250m Ω and less than 300m Ω, that is judged as lithium iron phosphate dynamic battery group
Charge-discharge performance is qualified；
If calculated internal resistance is less than 250m Ω, that charge-discharge performance being judged as lithium iron phosphate dynamic battery group is excellent.
The detection method of a kind of lithium iron phosphate dynamic battery group peak value charge-discharge performance the most as claimed in claim 4, is characterized in that,
Described first set the time as 30 minutes；Described second set the time as 5 minutes.
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| US20160131701A1 (en) * | 2014-11-07 | 2016-05-12 | Ford Global Technologies, Llc | Battery testing system and method |
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| CN105244559B (en) * | 2015-11-12 | 2019-12-10 | 中国检验检疫科学研究院 | Method for detecting comprehensive temperature performance of lithium ion battery |
| CN105548895B (en) * | 2015-12-17 | 2018-10-09 | 北京长城华冠汽车科技股份有限公司 | A kind of battery performance test method and device |
| CN107783044A (en) * | 2016-08-26 | 2018-03-09 | 神讯电脑(昆山)有限公司 | Battery screening plant and its method |
| CN110988713B (en) * | 2018-08-15 | 2022-07-01 | 深圳市比克动力电池有限公司 | Method for testing pulse current capability of lithium ion battery |
| JP7116701B2 (en) * | 2019-03-27 | 2022-08-10 | エスペック株式会社 | Charge/discharge test device, control program and charge/discharge test method |
| CN110618389A (en) * | 2019-09-25 | 2019-12-27 | 宝能汽车有限公司 | Method and device for testing battery SOC-OCV curve |
| CN111308163B (en) * | 2020-02-21 | 2022-08-30 | 青岛力神新能源科技有限公司 | Method for determining pulse discharge maximum current of lithium ion power battery |
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