CN105445663B - The detection method and device of cell degradation degree - Google Patents
The detection method and device of cell degradation degree Download PDFInfo
- Publication number
- CN105445663B CN105445663B CN201410422361.5A CN201410422361A CN105445663B CN 105445663 B CN105445663 B CN 105445663B CN 201410422361 A CN201410422361 A CN 201410422361A CN 105445663 B CN105445663 B CN 105445663B
- Authority
- CN
- China
- Prior art keywords
- battery
- soc
- internal resistance
- parameter
- ohmic internal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000015556 catabolic process Effects 0.000 title claims abstract description 42
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 42
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 230000032683 aging Effects 0.000 claims abstract description 81
- 238000012360 testing method Methods 0.000 claims description 79
- 230000005611 electricity Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 24
- 230000008569 process Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 241001269238 Data Species 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001386 lithium phosphate Inorganic materials 0.000 description 2
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- 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]
Abstract
The invention discloses a kind of detection method and device of cell degradation degree.Wherein, the detection method of cell degradation degree includes：First battery is tested, obtains the first battery parameter, wherein, the first battery is brand new cells；Second battery is tested, obtains the second battery parameter, wherein, the second battery is the battery of complete aging；3rd battery is tested, obtains the 3rd battery parameter, wherein, the 3rd battery is battery to be tested, and the first battery, the second battery and the 3rd battery are same battery, and the degree of aging of the 3rd battery and the degree of aging of the second battery differ；And the degree of aging of the 3rd battery is calculated using the first battery parameter, the second battery parameter and the 3rd battery parameter.By the present invention, solve the problems, such as in the prior art to cell degradation degree detecting inaccuracy, and then the effect detected exactly to cell degradation degree.
Description
Technical field
The present invention relates to fields of measurement, in particular to a kind of detection method and device of cell degradation degree.
Background technology
Cycle life of lithium ion battery is grown, and specific capacity is big, and self-discharge rate is small, the advantages that memoryless characteristic, into grinding for battery
Study carefully focus.In actual applications, it is often necessary to which the degree of aging of lithium ion battery is detected.Reach for ageing level or
Lithium ion battery close to lifetime limitation should be changed in time, otherwise, may cause danger to whole application.
The ageing level of battery, often with cell health state (State of Health, hereinafter referred to as SOH) as mark
Cause.SOH is defined as the actual capacity of battery and the ratio of nominal capacity.Traditional measurement battery SOH method has complete electric discharge
Method not only expends the time, it is necessary to carry out to battery that complete charge and discharge is electrically operated to measure battery actual capacity, and measuring method sheet
Body exacerbates the aging of battery.
There is direct electric discharge etc. using internal resistance measurement to carry out the method for SOH estimations.Direct electric discharge to equipment requirement compared with
Height, and measurement result is difficult to make a distinction ohmic internal resistance and polarization resistance.In fact, the internal resistance of battery is divided into ohmic internal resistance
And polarization resistance, and can directly reflect cell degradation level is ohmic internal resistance.Meanwhile direct electric discharge measurement obtain it is interior
Parameter is hindered simultaneously by battery charge state (State of Charge, hereinafter referred to as SOC) influence, to the anti-of degree of aging
Should be not accurate enough.
The problem of in correlation technique to cell degradation degree detecting inaccuracy, effective solution party is not yet proposed at present
Case.
The content of the invention
It is a primary object of the present invention to provide a kind of detection method and device of cell degradation degree, to solve existing skill
The problem of in art to cell degradation degree detecting inaccuracy.
A kind of according to an aspect of the invention, there is provided detection method of cell degradation degree.
Included according to the detection method of the cell degradation degree of the present invention：First battery is tested, obtains the first electricity
Pond parameter, wherein, first battery is brand new cells；Second battery is tested, obtains the second battery parameter, wherein,
Second battery is the battery of complete aging；3rd battery is tested, obtains the 3rd battery parameter, wherein, described
Three batteries are battery to be tested, and first battery, second battery and the 3rd battery are same battery, and described
The degree of aging of the degree of aging of 3rd battery and second battery differs；And utilize first battery parameter, institute
State the second battery parameter and the 3rd battery parameter calculates the degree of aging of the 3rd battery.
Further, the first battery is tested, obtaining the first battery parameter includes：First battery is mixed
The test of pulse ability characteristics is closed, obtains functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), wherein, U1To be described
The open-circuit voltage of first battery, SOC1For the battery charge state of first battery, r1In ohm for first battery
Resistance, first battery parameter include the functional relation U1=f1(SOC1) and the functional relation r1=f2(SOC1), to
Two batteries are tested, and obtaining the second battery parameter includes：The mixed pulses ability characteristics are carried out to second battery to survey
Examination, obtains functional relation r2=f2(SOC2), wherein, SOC2For the battery charge state of second battery, r2For described second
The ohmic internal resistance of battery, second battery parameter include the functional relation r2=f2(SOC2), the 3rd battery is surveyed
Examination, obtaining the 3rd battery parameter includes：Mixed pulses ability characteristics test is carried out to the 3rd battery, obtains described the
The ohmic internal resistance r of three batteries3xWith open-circuit voltage U3x, utilize first battery parameter, second battery parameter and described
The degree of aging that three battery parameters calculate the 3rd battery includes：According to the functional relation U1=f1(SOC1) described in calculating
3rd battery corresponds to the open-circuit voltage U3xBattery charge state SOC3x=f1 -1(U3x)；According to the functional relation r1=f2
(SOC1) first battery is calculated in the battery charge state SOC3xUnder Ohmic resistance r1x=f2(SOC3x) and default
Battery charge state SOC0Under ohmic internal resistance r10=f2(SOC0)；According to the functional relation r2=f2(SOC2) calculate described the
Two batteries are in the default battery charge state SOC0Under ohmic internal resistance r20=f2(SOC0)；And according to the ohmic internal resistance
r3x, the Ohmic resistance r1x=f2(SOC3x), the ohmic internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=f2
(SOC0) calculate the degree of aging of the 3rd battery.
Further, according to the ohmic internal resistance r3x, the Ohmic resistance r1x=f2(SOC3x), the ohmic internal resistance r10
=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) degree of aging that calculates the 3rd battery includes：According to the Europe
Nurse internal resistance r3x, the Ohmic resistance r1x=f2(SOC3x) and the ohmic internal resistance r10=f2(SOC0) calculate the 3rd battery and exist
The default battery charge state SOC0Under ohmic internal resistance r30；And according to the ohmic internal resistance r30, the ohmic internal resistance r10
=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) calculate the degree of aging of the 3rd battery.
Further, according to formulaCalculate the ohmic internal resistance r30；And according to formulaMeter
Calculate the degree of aging D of the 3rd battery.
According to another aspect of the present invention, there is provided a kind of detection means of cell degradation degree.
Included according to the detection means of the cell degradation degree of the present invention：First test cell, for entering to the first battery
Row test, obtains the first battery parameter, wherein, first battery is brand new cells；Second test cell, for the second electricity
Pond is tested, and obtains the second battery parameter, wherein, second battery is the battery of complete aging；3rd test cell, use
Tested in the 3rd battery, obtain the 3rd battery parameter, wherein, the 3rd battery is battery to be tested, described first
Battery, second battery and the 3rd battery are same battery, and the degree of aging of the 3rd battery and described
The degree of aging of two batteries differs；And computing unit, for utilizing first battery parameter, second battery parameter
The degree of aging of the 3rd battery is calculated with the 3rd battery parameter.
Further, first test cell includes：First test subelement, for being mixed to first battery
The test of pulse ability characteristics is closed, obtains functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), wherein, U1To be described
The open-circuit voltage of first battery, SOC1For the battery charge state of first battery, r1In ohm for first battery
Resistance, first battery parameter include the functional relation U1=f1(SOC1) and the functional relation r1=f2(SOC1), it is described
Second test cell includes：Second test subelement, is surveyed for carrying out the mixed pulses ability characteristics to second battery
Examination, obtains functional relation r2=f2(SOC2), wherein, SOC2For the battery charge state of second battery, r2For described second
The ohmic internal resistance of battery, second battery parameter include the functional relation r2=f2(SOC2), the 3rd test cell bag
Include：3rd test subelement, tests for carrying out the mixed pulses ability characteristics to the 3rd battery, obtains the described 3rd
The ohmic internal resistance r of battery3xWith open-circuit voltage U3x, the computing unit includes：First computation subunit, for according to the letter
Number relation U1=f1(SOC1) calculate the 3rd battery and correspond to the open-circuit voltage U3xBattery charge state SOC3x=f1 -1
(U3x)；Second computation subunit, for according to the functional relation r1=f2(SOC1) first battery is calculated in the battery
State-of-charge SOC3xUnder Ohmic resistance r1x=f2(SOC3x) and in default battery charge state SOC0Under ohmic internal resistance r10=
f2(SOC0)；3rd computation subunit, for according to the functional relation r2=f2(SOC2) second battery is calculated described
Default battery charge state SOC0Under ohmic internal resistance r20=f2(SOC0)；And the 4th computation subunit, for according to the Europe
Nurse internal resistance r3x, the Ohmic resistance r1x=f2(SOC3x), the ohmic internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=
f2(SOC0) calculate the degree of aging of the 3rd battery.
Further, the 4th computation subunit includes：First computing module, for according to the ohmic internal resistance r3x、
The Ohmic resistance r1x=f2(SOC3x) and the ohmic internal resistance r10=f2(SOC0) the 3rd battery is calculated described default
Battery charge state SOC0Under ohmic internal resistance r30；And second computing module, for according to the ohmic internal resistance r30, Europe
Nurse internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) calculate the degree of aging of the 3rd battery.
Further, first computing module is used for according to formulaCalculate the ohmic internal resistance r30；And
Second computing module is used for according to formulaCalculate the degree of aging D of the 3rd battery.
In the present invention, tested using to the first battery, obtain the first battery parameter, wherein, first battery
For brand new cells；Second battery is tested, obtains the second battery parameter, wherein, second battery is complete aging
Battery；3rd battery is tested, obtains the 3rd battery parameter, wherein, the 3rd battery is battery to be tested, described
One battery, second battery and the 3rd battery are same battery, and the degree of aging of the 3rd battery and described
The degree of aging of second battery differs；And utilize first battery parameter, second battery parameter and the described 3rd
Battery parameter calculates the degree of aging of the 3rd battery.By testing the battery of brand new cells and complete aging, enter
And the battery parameter of the battery parameter and complete aged battery based on brand new cells is counted to the degree of aging of battery to be tested
Calculate, discharge and recharge need not be carried out to battery to be tested by realizing, and avoid the influence institute band because discharging by battery charge state
The reaction to degree of aging come is not accurate enough, and the parameter testing of brand new cells and complete aged battery, can be to be measured
The parameter of examination battery is demarcated so that testing result is more accurate, solves in the prior art to cell degradation degree detecting
The problem of inaccurate, and then the effect that is detected exactly to cell degradation degree.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the detection method of cell degradation degree according to embodiments of the present invention；And
Fig. 2 is the schematic diagram of the detection means of cell degradation degree according to embodiments of the present invention.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, it should all belong to the model that the present invention protects
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
In the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.Below will
The present invention will be described in detail with reference to the accompanying drawings and embodiments.
Embodiment 1
According to embodiments of the present invention, there is provided it is a kind of can be real by method that the application device embodiment is practiced or carried out
Example is applied, it is necessary to explanation, can be in the meter of such as one group computer executable instructions the flow of accompanying drawing illustrates the step of
Performed in calculation machine system, although also, show logical order in flow charts, in some cases, can be with difference
Shown or described step is performed in order herein.
According to embodiments of the present invention, there is provided a kind of detection method of cell degradation degree, below to the embodiment of the present invention
The detection method of the cell degradation degree provided does specific introduction：
Fig. 1 is the flow chart of the detection method of cell degradation degree according to embodiments of the present invention, as shown in figure 1, the party
Method mainly includes steps S102 to step S108：
S102：First battery is tested, obtains the first battery parameter, wherein, the first battery is brand new cells, i.e.
Brand-new battery is tested, obtains the battery parameter of brand new cells, referred to as the first battery parameter.
S104：Second battery is tested, obtains the second battery parameter, wherein, the second battery is the electricity of complete aging
Pond, i.e. test the battery of complete aging, obtain the battery parameter of complete aged battery, referred to as the second battery parameter.
S106：3rd battery is tested, obtains the 3rd battery parameter, wherein, the 3rd battery is battery to be tested, the
One battery, the second battery and the 3rd battery are same battery, and the aging journey of the degree of aging of the 3rd battery and the second battery
Degree differs, i.e. pair is that similar battery to be tested is tested with the first battery and the second battery, obtains battery to be tested
Battery parameter, referred to as the 3rd battery parameter.
S108：The aging journey of the 3rd battery is calculated using the first battery parameter, the second battery parameter and the 3rd battery parameter
Degree, i.e. using the battery parameter of the battery parameter of brand new cells and complete aged battery be and the treating of going out of binding test with reference to basic
The relevant parameter of battery is tested, the degree of aging of battery to be tested is calculated.
The detection method for the cell degradation degree that the embodiment of the present invention is provided, by brand new cells and complete aging
Battery is tested, and then the battery parameter of the battery parameter based on brand new cells and complete aged battery is to battery to be tested
Degree of aging is calculated, and discharge and recharge need not be carried out to battery to be tested by realizing, and be avoided because discharging by battery charge
Reaction caused by the influence of state to degree of aging is not accurate enough, and the parameter of brand new cells and complete aged battery is surveyed
Examination, can be demarcated so that testing result is more accurate, solves in the prior art to battery to the parameter of battery to be tested
The problem of degree of aging detection is inaccurate, and then the effect that is detected exactly to cell degradation degree.
Wherein, in embodiments of the present invention, mixed pulses ability characteristics (Hybrid Pulse Power mainly are used
Characteristic, hereinafter referred to as HPPC) battery is tested, detailed description below：
First battery is tested, obtaining the first battery parameter is mainly：Mixed pulses ability is carried out to the first battery
Characteristic test, obtain functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), wherein, U1For the open circuit of the first battery
Voltage, SOC1For the battery charge state of the first battery, r1For the ohmic internal resistance of the first battery, the first battery parameter includes function
Relation U1=f1(SOC1) and functional relation r1=f2(SOC1), specifically, following steps 1-1 to step 1-5 can be used to the
One battery is tested：
Step 1-1, the first battery is discharged until the discharge voltage limit of the first battery with 1C constant current.
Step 1-2, by battery standing 1 hour.
Step 1-3, to the first battery with 1C constant current charge until the charging voltage limit of the first battery.Record electricity
The charging interval t (hour) in pond, then the initial capacity of battery be：
Cnew=1C × t
Step 1-4, by battery standing one hour.
Step 1-5, the first battery is discharged with 1C constant current, until SOC1=0.9, the first battery is mixed
Pulse ability characteristics (Hybrid Pulse Power Characteristic, hereinafter referred to as HPPC) are tested.5 minutes are stood, will
Battery is discharged with 1C constant current, until SOC1=0.8, HPPC tests are carried out to battery.Test process afterwards can be with class
Push away, i.e., every 0.1SOC1HPPC tests are performed to battery, until the first battery reaches the electric discharge limit.
Then, parameter identification is carried out to the HPPC test datas of the first battery, battery open circuit voltage U can be obtained1And Europe
Nurse internal resistance r1In different SOC1Under numerical value, carry out interpolative operation, battery open circuit voltage U can be obtained1, ohmic internal resistance r1No
Same SOC1Functional relation U1=f1(SOC1), functional relation r1=f2(SOC1)。
Second battery is tested, obtaining the second battery parameter is mainly：Mixed pulses ability is carried out to the second battery
Characteristic test, obtain functional relation r2=f2(SOC2), wherein, SOC2For the battery charge state of the second battery, r2For the second electricity
The ohmic internal resistance in pond, the second battery parameter include functional relation r2=f2(SOC2), specifically, following steps 2-1 can be used extremely
Step 2-4 is tested the first battery：
Step 2-1, to the second battery of complete aging, (second battery can complete above-mentioned steps 1-1 to step 1-5
Battery) carry out cycle charge-discharge.Detailed process is：First, the second battery is filled with 0.5C constant current charges until reaching
The piezoelectric voltage limit；Then 0.5 hour is stood；Then the second battery is discharged until reaching discharge voltage pole with 1C constant currents
Limit；Then 0.5 hour is stood.Record the battery capacity Q in charge and discharge process.The process is repeated several times, until Q=0.8Q0,
Wherein, Q0For the nominal capacity of the second battery.
Step 2-2, the second battery is fully charged with 1C constant currents, until the second battery reaches charging voltage pole
Limit.
Step 2-3, by the second battery standing 1 hour.
Step 2-4, with 1C constant currents to the second battery discharge, until the SOC of the second battery2=0.5, stand 1 hour.
Then HPPC tests are carried out to battery.
Then, parameter identification is carried out to the HPPC test datas of the second battery, battery open circuit voltage U can be obtained2And Europe
Nurse internal resistance r2In different SOC2Under numerical value, carry out interpolative operation, battery open circuit voltage U can be obtained2, ohmic internal resistance r2No
Same SOC2Functional relation U2=f1(SOC2), functional relation r2=f2(SOC2), U2For the open-circuit voltage of second battery.
3rd battery is tested, obtaining the 3rd battery parameter is mainly：Mixed pulses ability is carried out to the 3rd battery
Characteristic test, and identified by parameter, obtain the ohmic internal resistance r of the 3rd battery3xWith open-circuit voltage U3x。
Correspondingly, the aging of the 3rd battery is calculated using the first battery parameter, the second battery parameter and the 3rd battery parameter
Degree comprises the following steps 3-1 to step 3-4：
Step 3-1, according to functional relation U1=f1(SOC1) calculate the 3rd battery correspond to open-circuit voltage U3xBattery charge shape
State SOC3x=f1 -1(U3x)。
Step 3-2, according to functional relation r1=f2(SOC1) the first battery is calculated in battery charge state SOC3xUnder ohm
Resistance r1x=f2(SOC3x) and in default battery charge state SOC0Under ohmic internal resistance r10=f2(SOC0), implement in the present invention
, can be by default battery charge state SOC in example0It is arranged to SOC0=0.5 battery charge state, equivalent to by brand-new
One battery is in SOC0Ohmic internal resistance of the ohmic internal resistance as brand new cells at=0.5, it is, of course, also possible to by default battery charge
State SOC0It is arranged to SOC0For the battery charge state of other numerical value.
Step 3-3, according to functional relation r2=f2(SOC2) the second battery is calculated in default battery charge state SOC0Under
Ohmic internal resistance r20=f2(SOC0), for SOC0=0.5 situation, equivalent to by the second battery of complete aging in SOC0=0.5
Ohmic internal resistance of the ohmic internal resistance at place as complete aged battery.
Step 3-4, according to ohmic internal resistance r3x, Ohmic resistance r1x=f2(SOC3x), ohmic internal resistance r10=f2(SOC0) and Europe
Nurse internal resistance r20=f2(SOC0) calculate the 3rd battery degree of aging, specifically, can be first according to ohmic internal resistance r3x, Ohmic resistance
r1x=f2(SOC3x) and ohmic internal resistance r10=f2(SOC0) the 3rd battery is calculated in default battery charge state SOC0Under ohm
Internal resistance r30, i.e. the ohmic internal resistance conversion of battery to be tested is arrived and the first battery and the second battery identical battery charge state
Under.Then, according to ohmic internal resistance r30, ohmic internal resistance r10=f2(SOC0) and ohmic internal resistance r20=f2(SOC0) calculate the 3rd battery
Degree of aging.
Due to weighing cell degradation degree, it is necessary to reduce the interference of battery charge state as far as possible, by by battery to be tested
Battery charge state conversion arrive same SOC value under, influence of the battery charge state to battery parameter can be rejected so that battery
The testing result of degree of aging is more accurate.
For similar battery (such as：Iron lithium phosphate battery), the battery charge state of these similar batteries and internal resistance
Relation function formula be similar, an only poor proportionality coefficient, therefore, for the first brand-new battery and the to be tested the 3rd electricity
For pond, there is following relation：
That is,
Therefore, can be according to formulaCalculate ohmic internal resistance r30, and according to formulaCalculate the 3rd
The degree of aging D of battery.
The detection method for the cell degradation degree that the embodiment of the present invention is provided, tested and combined by battery fast charging and discharging
Parameter identification carries out cell degradation degree detecting, and this method can realize the quick detection to cell degradation degree, substantially reduce
Time that detection needs.Parameter identification carries out the differentiation of ohmic internal resistance and polarization resistance, and rejects battery charge state to electricity
The influence of pond parameter so that the result of cell degradation degree detecting is more accurate.Before being used for quickly detecting, carry out first
The parameter testing of brand new cells and complete aged battery, the test can carry out parameter calibration so that testing result is more accurate.
The detection method is tested on the iron lithium phosphate battery of polylith different capabilities, and test result shows, this method can be real
Now to the quick detection of cell degradation degree, detection time is short, and precision is high, can be good at meeting electric automobile power battery
Testing requirements.
It should be noted that for foregoing each method embodiment, in order to be briefly described, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should know, the present invention is not limited by described sequence of movement because
According to the present invention, some steps can use other orders or carry out simultaneously.Secondly, those skilled in the art should also know
Know, embodiment described in this description belongs to preferred embodiment, and involved action and module are not necessarily of the invention
It is necessary.
Through the above description of the embodiments, those skilled in the art can be understood that according to above-mentioned implementation
The method of example can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but a lot
In the case of the former be more preferably embodiment.Based on such understanding, technical scheme is substantially in other words to existing
The part that technology contributes can be embodied in the form of software product, and the computer software product is stored in a storage
In medium (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, calculate
Machine, server, or network equipment etc.) perform method described in each embodiment of the present invention.
Embodiment 2
According to embodiments of the present invention, a kind of battery for being used to implement the detection method of above-mentioned cell degradation degree is additionally provided
The detection means of degree of aging, the detection means of the cell degradation degree are mainly used in performing the above of embodiment of the present invention institute
The detection method of the cell degradation degree of offer, the detection means of the cell degradation degree provided below the embodiment of the present invention
Do specific introduction：
Fig. 2 is the schematic diagram of the detection means of cell degradation degree according to embodiments of the present invention, as shown in Fig. 2 the electricity
The detection means of pond degree of aging mainly includes the first test cell 10, the second test cell 20, the 3rd test cell 30 and meter
Unit 40 is calculated, wherein：
First test cell 10 is used to test the first battery, obtains the first battery parameter, wherein, the first battery is
Brand new cells, i.e. test brand-new battery, obtain the battery parameter of brand new cells, referred to as the first battery parameter.
Second test cell 20 is used to test the second battery, obtains the second battery parameter, wherein, the second battery is
The battery of complete aging, i.e. the battery of complete aging is tested, obtains the battery parameter of complete aged battery, referred to as the
Two battery parameters.
3rd test cell 30 is used to test the 3rd battery, obtains the 3rd battery parameter, wherein, the 3rd battery is
Battery to be tested, the first battery, the second battery and the 3rd battery are same battery, and the degree of aging and second of the 3rd battery
The degree of aging of battery differs, i.e. pair is that similar battery to be tested is tested with the first battery and the second battery, obtains
The battery parameter of battery to be tested, referred to as the 3rd battery parameter.
Computing unit 40 is used to calculate the 3rd battery using the first battery parameter, the second battery parameter and the 3rd battery parameter
Degree of aging, i.e. using the battery parameter of the battery parameter of brand new cells and complete aged battery as with reference to basis, and combine survey
The relevant parameter of the battery to be tested tried out, is calculated the degree of aging of battery to be tested.
The detection means for the cell degradation degree that the embodiment of the present invention is provided, by brand new cells and complete aging
Battery is tested, and then the battery parameter of the battery parameter based on brand new cells and complete aged battery is to battery to be tested
Degree of aging is calculated, and discharge and recharge need not be carried out to battery to be tested by realizing, and be avoided because discharging by battery charge
Reaction caused by the influence of state to degree of aging is not accurate enough, and the parameter of brand new cells and complete aged battery is surveyed
Examination, can be demarcated so that testing result is more accurate, solves in the prior art to battery to the parameter of battery to be tested
The problem of degree of aging detection is inaccurate, and then the effect that is detected exactly to cell degradation degree.
Wherein, in embodiments of the present invention, mixed pulses ability characteristics (Hybrid Pulse Power mainly are used
Characteristic, hereinafter referred to as HPPC) battery is tested, detailed description below：
First test cell 10 mainly includes the first test subelement, and the first test subelement is used to enter the first battery
Row mixed pulses ability characteristics are tested, and obtain functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), wherein, U1For
The open-circuit voltage of first battery, SOC1For the battery charge state of the first battery, r1For the ohmic internal resistance of the first battery, the first electricity
Pond parameter includes functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), specifically, the first test subelement can be with
The first battery is tested using following steps 1-1 to step 1-5：
Step 1-1, the first battery is discharged until the discharge voltage limit of the first battery with 1C constant current.
Step 1-2, by battery standing 1 hour.
Step 1-3, to the first battery with 1C constant current charge until the charging voltage limit of the first battery.Record electricity
The charging interval t (hour) in pond, then the initial capacity of battery be：
Cnew=1C × t
Step 1-4, by battery standing one hour.
Step 1-5, the first battery is discharged with 1C constant current, until SOC1=0.9, the first battery is mixed
Pulse ability characteristics (Hybrid Pulse Power Characteristic, hereinafter referred to as HPPC) are tested.5 minutes are stood, will
Battery is discharged with 1C constant current, until SOC1=0.8, HPPC tests are carried out to battery.Test process afterwards can be with class
Push away, i.e., every 0.1SOC1HPPC tests are performed to battery, until the first battery reaches the electric discharge limit.
Then, parameter identification is carried out to the HPPC test datas of the first battery, battery open circuit voltage U can be obtained1And Europe
Nurse internal resistance r1In different SOC1Under numerical value, carry out interpolative operation, battery open circuit voltage U can be obtained1, ohmic internal resistance r1No
Same SOC1Functional relation U1=f1(SOC1), functional relation r1=f2(SOC1)。
Second test cell 20 mainly includes the second test subelement, and the second test subelement is used to enter the second battery
Row mixed pulses ability characteristics are tested, and obtain functional relation r2=f2(SOC2), wherein, SOC2For the battery charge of the second battery
State, r2For the ohmic internal resistance of the second battery, the second battery parameter includes functional relation r2=f2(SOC2), specifically, second surveys
Swab unit can be tested the first battery using following steps 2-1 to step 2-4：
Step 2-1, to the second battery of complete aging, (second battery can complete above-mentioned steps 1-1 to step 1-5
Battery) carry out cycle charge-discharge.Detailed process is：First, the second battery is filled with 0.5C constant current charges until reaching
The piezoelectric voltage limit；Then 0.5 hour is stood；Then the second battery is discharged until reaching discharge voltage pole with 1C constant currents
Limit；Then 0.5 hour is stood.Record the battery capacity Q in charge and discharge process.The process is repeated several times, until Q=0.8Q0,
Wherein, Q0For the nominal capacity of the second battery.
Step 2-2, the second battery is fully charged with 1C constant currents, until the second battery reaches charging voltage pole
Limit.
Step 2-3, by the second battery standing 1 hour.
Step 2-4, with 1C constant currents to the second battery discharge, until the SOC of the second battery2=0.5, stand 1 hour.
Then HPPC tests are carried out to battery.
Then, parameter identification is carried out to the HPPC test datas of the second battery, battery open circuit voltage U can be obtained2And Europe
Nurse internal resistance r2In different SOC2Under numerical value, carry out interpolative operation, battery open circuit voltage U can be obtained2, ohmic internal resistance r2No
Same SOC2Functional relation U2=f1(SOC2), functional relation r2=f2(SOC2), U2For the open-circuit voltage of second battery.
3rd test cell 30 mainly includes the 3rd test subelement, and the 3rd test subelement is used to enter the 3rd battery
Row mixed pulses ability characteristics are tested, and obtain the ohmic internal resistance r of the 3rd battery3xWith open-circuit voltage U3x。
Computing unit 40 mainly includes first to fourth computation subunit, wherein：
First computation subunit is used for according to functional relation U1=f1(SOC1) calculate the 3rd battery correspond to open-circuit voltage U3x's
Battery charge state SOC3x=f1 -1(U3x)。
Second computation subunit is used for according to functional relation r1=f2(SOC1) the first battery is calculated in battery charge state
SOC3xUnder Ohmic resistance r1x=f2(SOC3x) and in default battery charge state SOC0Under ohmic internal resistance r10=f2(SOC0),
In embodiments of the present invention, can be by default battery charge state SOC0It is arranged to SOC0=0.5 battery charge state, quite
In by the first brand-new battery in SOC0Ohmic internal resistance of the ohmic internal resistance as brand new cells at=0.5, it is, of course, also possible to will
Default battery charge state SOC0It is arranged to SOC0For the battery charge state of other numerical value.
3rd computation subunit is used for according to functional relation r2=f2(SOC2) the second battery is calculated in default battery charge shape
State SOC0Under ohmic internal resistance r20=f2(SOC0), for SOC0=0.5 situation, equivalent to by the second battery of complete aging
In SOC0Ohmic internal resistance of the ohmic internal resistance as complete aged battery at=0.5.
4th computation subunit is used for according to ohmic internal resistance r3x, Ohmic resistance r1x=f2(SOC3x), ohmic internal resistance r10=f2
(SOC0) and ohmic internal resistance r20=f2(SOC0) calculate the 3rd battery degree of aging, specifically, the 4th computation subunit is mainly wrapped
The first computing module and the second computing module are included, wherein, the first computing module is used for according to ohmic internal resistance r3x, Ohmic resistance r1x
=f2(SOC3x) and ohmic internal resistance r10=f2(SOC0) the 3rd battery is calculated in default battery charge state SOC0Under ohmic internal resistance
r30, i.e. by the conversion of the ohmic internal resistance of battery to be tested arrive with the first battery and the second battery identical battery charge state.The
Two computing modules are used for according to ohmic internal resistance r30, ohmic internal resistance r10=f2(SOC0) and ohmic internal resistance r20=f2(SOC0) calculate the
The degree of aging of three batteries.
Due to weighing cell degradation degree, it is necessary to reduce the interference of battery charge state as far as possible, by by battery to be tested
Battery charge state conversion arrive same SOC value under, influence of the battery charge state to battery parameter can be rejected so that battery
The testing result of degree of aging is more accurate.
For similar battery (such as：Iron lithium phosphate battery), the battery charge state of these similar batteries and internal resistance
Relation function formula be similar, an only poor proportionality coefficient, therefore, for the first brand-new battery and the to be tested the 3rd electricity
For pond, there is following relation：
That is,
Therefore, the first computing module can be according to formulaCalculate ohmic internal resistance r30, the second computing module can be with
According to formulaCalculate the degree of aging D of the 3rd battery.
As can be seen from the above description, the present invention realizes the quick detection realized to cell degradation degree, significantly
Reduce the time that detection needs.Parameter identification carries out the differentiation of ohmic internal resistance and polarization resistance, and rejects battery charge state
Influence to battery parameter so that the result of cell degradation degree detecting is more accurate.Before being used for quickly detecting, enter first
The parameter testing of brand new cells and complete aged battery is gone, the test can carry out parameter calibration so that testing result is more
Accurately.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, either they are fabricated to respectively each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific
Hardware and software combines.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (6)
- A kind of 1. detection method of cell degradation degree, it is characterised in that including：First battery is tested, obtains the first battery parameter, wherein, first battery is brand new cells；Second battery is tested, obtains the second battery parameter, wherein, second battery is the battery of complete aging；3rd battery is tested, obtains the 3rd battery parameter, wherein, the 3rd battery is battery to be tested, described One battery, second battery and the 3rd battery are same battery, and the degree of aging of the 3rd battery and described The degree of aging of second battery differs；AndThe 3rd battery is calculated using first battery parameter, second battery parameter and the 3rd battery parameter Degree of aging；Wherein, the first battery is tested, obtaining the first battery parameter includes：Mixed pulses energy is carried out to first battery Force characteristic is tested, and obtains functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), wherein, U1For first battery Open-circuit voltage, SOC1For the battery charge state of first battery, r1For the ohmic internal resistance of first battery, described One battery parameter includes the functional relation U1=f1(SOC1) and the functional relation r1=f2(SOC1),Second battery is tested, obtaining the second battery parameter includes：The mixed pulses energy is carried out to second battery Force characteristic is tested, and obtains functional relation r2=f2(SOC2), wherein, SOC2For the battery charge state of second battery, r2For The ohmic internal resistance of second battery, second battery parameter include the functional relation r2=f2(SOC2),3rd battery is tested, obtaining the 3rd battery parameter includes：The mixed pulses energy is carried out to the 3rd battery Force characteristic is tested, and obtains the ohmic internal resistance r of the 3rd battery3xWith open-circuit voltage U3x,The 3rd battery is calculated using first battery parameter, second battery parameter and the 3rd battery parameter Degree of aging includes：According to the functional relation U1=f1(SOC1) calculate the 3rd battery and correspond to the open-circuit voltage U3x's Battery charge state SOC3x=f1-1(U3x)；According to the functional relation r1=f2(SOC1) first battery is calculated described Battery charge state SOC3xUnder Ohmic resistance r1x=f2(SOC3x) and in default battery charge state SOC0Under ohmic internal resistance r10=f2(SOC0)；According to the functional relation r2=f2(SOC2) second battery is calculated in the default battery charge shape State SOC0Under ohmic internal resistance r20=f2(SOC0)；And according to the ohmic internal resistance r3x, the Ohmic resistance r1x=f2 (SOC3x), the ohmic internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) calculate the old of the 3rd battery Change degree.
- 2. detection method according to claim 1, it is characterised in that according to the ohmic internal resistance r3x, the Ohmic resistance r1x=f2(SOC3x), the ohmic internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) calculate the 3rd electricity The degree of aging in pond includes：According to the ohmic internal resistance r3x, the Ohmic resistance r1x=f2(SOC3x) and the ohmic internal resistance r10=f2(SOC0) calculate 3rd battery is in the default battery charge state SOC0Under ohmic internal resistance r30；AndAccording to the ohmic internal resistance r30, the ohmic internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) calculate The degree of aging of 3rd battery.
- 3. detection method according to claim 2, it is characterised in thatAccording to formulaCalculate the ohmic internal resistance r30；AndAccording to formulaCalculate the degree of aging D of the 3rd battery.
- A kind of 4. detection means of cell degradation degree, it is characterised in that including：First test cell, for testing the first battery, the first battery parameter is obtained, wherein, first battery is Brand new cells；Second test cell, for testing the second battery, the second battery parameter is obtained, wherein, second battery is The battery of complete aging；3rd test cell, for testing the 3rd battery, the 3rd battery parameter is obtained, wherein, the 3rd battery is Battery to be tested, first battery, second battery and the 3rd battery are same battery, and the 3rd battery Degree of aging and the degree of aging of second battery differ；AndComputing unit, for being calculated using first battery parameter, second battery parameter and the 3rd battery parameter The degree of aging of 3rd battery；Wherein, first test cell includes：First test subelement, for carrying out mixed pulses energy to first battery Force characteristic is tested, and obtains functional relation U1=f1(SOC1) and functional relation r1=f2(SOC1), wherein, U1For first battery Open-circuit voltage, SOC1For the battery charge state of first battery, r1For the ohmic internal resistance of first battery, described One battery parameter includes the functional relation U1=f1(SOC1) and the functional relation r1=f2(SOC1), second test is single Member includes：Second test subelement, tests for carrying out the mixed pulses ability characteristics to second battery, obtains function Relation r2=f2(SOC2), wherein, SOC2For the battery charge state of second battery, r2In ohm for second battery Resistance, second battery parameter include the functional relation r2=f2(SOC2),3rd test cell includes：3rd test subelement, for carrying out the mixed pulses energy to the 3rd battery Force characteristic is tested, and obtains the ohmic internal resistance r of the 3rd battery3xWith open-circuit voltage U3x,The computing unit includes：First computation subunit, for according to the functional relation U1=f1(SOC1) calculate described the Three batteries correspond to the open-circuit voltage U3xBattery charge state SOC3x=f1 -1(U3x)；Second computation subunit, for basis The functional relation r1=f2(SOC1) first battery is calculated in the battery charge state SOC3xUnder Ohmic resistance r1x =f2(SOC3x) and in default battery charge state SOC0Under ohmic internal resistance r10=f2(SOC0)；3rd computation subunit, is used for According to the functional relation r2=f2(SOC2) second battery is calculated in the default battery charge state SOC0Under ohm Internal resistance r20=f2(SOC0)；And the 4th computation subunit, for according to the ohmic internal resistance r3x, the Ohmic resistance r1x=f2 (SOC3x), the ohmic internal resistance r10=f2(SOC0) and the ohmic internal resistance r20=f2(SOC0) calculate the old of the 3rd battery Change degree.
- 5. detection means according to claim 4, it is characterised in that the 4th computation subunit includes：First computing module, for according to the ohmic internal resistance r3x, the Ohmic resistance r1x=f2(SOC3x) and described ohm in Hinder r10=f2(SOC0) the 3rd battery is calculated in the default battery charge state SOC0Under ohmic internal resistance r30；AndSecond computing module, for according to the ohmic internal resistance r30, the ohmic internal resistance r10=f2(SOC0) and described ohm in Hinder r20=f2(SOC0) calculate the degree of aging of the 3rd battery.
- 6. detection means according to claim 5, it is characterised in thatFirst computing module is used for according to formulaCalculate the ohmic internal resistance r30；AndSecond computing module is used for according to formulaCalculate the degree of aging D of the 3rd battery.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422361.5A CN105445663B (en) | 2014-08-25 | 2014-08-25 | The detection method and device of cell degradation degree |
| PCT/CN2014/085341 WO2016029392A1 (en) | 2014-08-25 | 2014-08-27 | Method and apparatus for detecting ageing degree of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422361.5A CN105445663B (en) | 2014-08-25 | 2014-08-25 | The detection method and device of cell degradation degree |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105445663A CN105445663A (en) | 2016-03-30 |
| CN105445663B true CN105445663B (en) | 2018-04-03 |
Family
ID=55398606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410422361.5A Active CN105445663B (en) | 2014-08-25 | 2014-08-25 | The detection method and device of cell degradation degree |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105445663B (en) |
| WO (1) | WO2016029392A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785278B (en) * | 2016-05-12 | 2018-05-22 | 苏州协鑫集成科技工业应用研究院有限公司 | Battery life evaluation method and device |
| US10345392B2 (en) * | 2016-11-18 | 2019-07-09 | Semiconductor Components Industries, Llc | Methods and apparatus for estimating a state of health of a battery |
| CN108732203B (en) * | 2017-04-13 | 2021-07-30 | 中国电力科学研究院 | Method for detecting flatulence degree of lithium titanate battery |
| CN107943263A (en) * | 2017-12-04 | 2018-04-20 | 合肥联宝信息技术有限公司 | The power control method and device of a kind of electronic equipment |
| CN108152750B (en) * | 2017-12-26 | 2020-09-04 | 深圳先进技术研究院 | Battery charging and discharging parameter identification method and system for electric automobile |
| CN109613446B (en) * | 2019-01-14 | 2020-12-08 | 中国计量大学 | Lithium battery aging detection method based on time series analysis |
| CN110646742A (en) * | 2019-10-15 | 2020-01-03 | 桑顿新能源科技(长沙)有限公司 | Power battery SOH acquisition method, system and related assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043132A (en) * | 2009-10-14 | 2011-05-04 | 索尼公司 | Battery pack and method for detecting degradation of battery |
| CN103091642A (en) * | 2013-01-22 | 2013-05-08 | 北京交通大学 | Lithium battery capacity rapid estimation method |
| CN103293483A (en) * | 2013-05-24 | 2013-09-11 | 杭州电子科技大学 | Lithium battery health condition estimation method based on internal resistance measurement |
| CN103728563A (en) * | 2013-12-17 | 2014-04-16 | 惠州市亿能电子有限公司 | Method for measuring and calculating health status of batteries |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI411796B (en) * | 2009-12-22 | 2013-10-11 | Ind Tech Res Inst | Apparatus for estimating battery's state of health |
| US9244132B2 (en) * | 2011-09-12 | 2016-01-26 | Eaglepicher Technologies, Llc | Systems and methods for determining battery state-of-health |
-
2014
- 2014-08-25 CN CN201410422361.5A patent/CN105445663B/en active Active
- 2014-08-27 WO PCT/CN2014/085341 patent/WO2016029392A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043132A (en) * | 2009-10-14 | 2011-05-04 | 索尼公司 | Battery pack and method for detecting degradation of battery |
| CN103091642A (en) * | 2013-01-22 | 2013-05-08 | 北京交通大学 | Lithium battery capacity rapid estimation method |
| CN103293483A (en) * | 2013-05-24 | 2013-09-11 | 杭州电子科技大学 | Lithium battery health condition estimation method based on internal resistance measurement |
| CN103728563A (en) * | 2013-12-17 | 2014-04-16 | 惠州市亿能电子有限公司 | Method for measuring and calculating health status of batteries |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016029392A1 (en) | 2016-03-03 |
| CN105445663A (en) | 2016-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105445663B (en) | The detection method and device of cell degradation degree | |
| CN110501652B (en) | Rapid assessment method and device for available capacity of retired lithium battery | |
| CN101359036B (en) | Method for measuring state of charge of battery | |
| US10429449B2 (en) | Battery pack tester | |
| CN107991623A (en) | It is a kind of to consider temperature and the battery ampere-hour integration SOC methods of estimation of degree of aging | |
| US20040145371A1 (en) | Query based electronic battery tester | |
| CN104577242B (en) | A kind of batteries management system and method | |
| CN104698385A (en) | Cell state calculation apparatus and cell state calculation method | |
| CN109870659A (en) | Using the health state of lithium ion battery evaluation method of sliding window optimizing strategy | |
| CN109143108A (en) | A kind of estimation method of the lithium ion battery SOH based on electrochemical impedance spectroscopy | |
| KR101227417B1 (en) | A method for the SOC estimation of Li-ion battery and a system for its implementation | |
| CN103884991A (en) | Test method for single body cell DC internal resistance | |
| US10073146B2 (en) | Apparatus for estimating voltage of hybrid secondary battery and method thereof | |
| CN104282960B (en) | Battery module | |
| CN109387788A (en) | The inspection method and manufacturing method of electrical storage device | |
| CN106125001A (en) | The fast evaluation method of electric automobile retired battery module actual capacity | |
| CN104977537A (en) | Battery SOC determination method and battery management system using method | |
| CN107843845A (en) | A kind of power lithium-ion battery SOH estimation on line methods | |
| CN106124996A (en) | A kind of consistency checking method and device of lithium-ion battery monomer | |
| US20230358810A1 (en) | Method for estimating state of charge of battery | |
| CN109613438A (en) | A kind of SOC-OCV relationship evaluation method | |
| KR20110105047A (en) | Output power measuring method of lithium secondary battery using ac impedance measurement | |
| Safoutin et al. | Effect of current and SOC on round-trip energy efficiency of a lithium-iron phosphate (LiFePO4) battery pack | |
| CN107505575A (en) | A kind of fast evaluation method of retired electrokinetic cell | |
| CN110515008A (en) | A kind of electrokinetic cell system capacity test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |