CN108448181A - A kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching and system - Google Patents
A kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching and system Download PDFInfo
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- CN108448181A CN108448181A CN201810321947.0A CN201810321947A CN108448181A CN 108448181 A CN108448181 A CN 108448181A CN 201810321947 A CN201810321947 A CN 201810321947A CN 108448181 A CN108448181 A CN 108448181A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching and system, method to include：A batch is waited for that combo battery core is discharged to the first predetermined carried charge SOC1 with predetermined discharge electric current Id；It will respectively wait for that combo battery core with the first DC current I1 electric discharge predetermined time T, obtains the first voltage difference △ U1 for respectively waiting for that the electric discharge of combo battery core is front and back；Similarly, △ U2, △ U3 and △ U4 are obtained；It will respectively wait for that combo battery core charges to the second predetermined carried charge SOC2 with predetermined charging current Ic；It will respectively wait for that combo battery core with the first DC current I1 electric discharge predetermined time T, obtains the 5th voltage difference △ U5 for respectively waiting for that the electric discharge of combo battery core is front and back；Similarly, △ U6 are obtained；To respectively wait for combo battery core carry out combo, by each voltage difference parameter all same or approach it is identical wait for combo battery core match be one group, voltage difference parameter includes △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6.The battery core that the present invention selects dynamic DC impedance characteristic consistent carries out combo, reduces security risk.
Description
Technical field
The present invention relates to field of lithium ion battery more particularly to a kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance to match
Group method and system.
Background technology
The combo mode that most of Li-ion batteries piles manufacturers select at present is that battery core is in carried charge 50% or so
In the case of provide performance indicator and carry out combo, common performance indicator has capacity, voltage, AC impedance etc..Such as Chinese invention
Patent 201210375543.2 discloses a kind of method for group matching of lithium ion battery, passes through the performance indicators such as capacity, voltage, internal resistance
Combo is carried out to lithium ion battery.
But this kind of scheme is the simple basic performance matching of battery core, what is utilized is static battery core characteristic combo, electricity
The characteristic of core does not embody completely.It has ignored battery core is run with DC current in practice, has also been ignored as battery core
The variation of DC impedance when with carrying, for battery core under the action of different DC, the DC impedance of performance is practical
Be it is different, DC impedance it is different, cause the voltage potential of each battery core in battery pack different, to easily cause
Battery core, which occurs overcharging and cross under actual DC charge status, the hidden string such as puts, and is directed at battery pack and safety accident occurs.Traditional
Battery core method for group matching does not account for dynamic DC impedance characteristic, and the battery pack that combo obtains is caused to have security risk.
Invention content
The purpose of the present invention is to provide a kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching and system,
It selects the close battery core of dynamic DC impedance characteristic and carries out combo, to solve problem above.
For this purpose, the present invention uses following technical scheme：
A kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching, including：
S110, a batch being waited for, combo battery core is discharged to the first predetermined carried charge SOC1 with predetermined discharge electric current Id；
S120, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for that combo battery core is discharged
Front and back first voltage difference △ U1；Combo battery core will respectively be waited for the second DC current I2 electric discharge predetermined time T, acquisition respectively waits for combo
The front and back second voltage difference △ U2 of battery core electric discharge；It will respectively wait for that combo battery core with the first DC current I1 charging predetermined time T, obtains
Respectively wait for the front and back tertiary voltage difference △ U3 of combo battery core charging；It will respectively wait for combo battery core with the second pre- timing of DC current I2 chargings
Between T, obtain the 4th voltage difference △ U4 for respectively waiting for that the charging of combo battery core is front and back；
S130, it will respectively wait for that combo battery core charges to the second predetermined carried charge SOC2 with predetermined charging current Ic；
S140, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for that combo battery core is discharged
The 5th front and back voltage difference △ U5；It will respectively wait for that combo battery core with the second DC current I2 electric discharge predetermined time T, respectively waits for combo battery core
Obtain the 6th front and back voltage difference △ U6 of electric discharge；
S150, to respectively wait for combo battery core carry out combo, by each voltage difference parameter all same or approach it is identical several
It is one group to wait for that combo battery core is matched, and multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6.
Optionally, the step S150 is specifically included：
A batch is waited for that combo battery core is divided into several first groups according to △ U1, it is △ U1 is identical or approach is identical several waits matching
Group battery core forms one group；It is divided into several second groups by each first group according to △ U2, it is △ U2 is identical or approach is identical several waits for
Combo battery core forms one group；Be divided into several third groups by each second group according to △ U3, by △ U3 it is identical or approach it is identical several
Wait for that combo battery core forms one group；According to △ U4 by each third component be several 4th groups, if by △ U4 it is identical or approach it is identical
It is dry to wait for that combo battery core forms one group；Be divided into several 5th groups by each 4th group according to △ U5, by △ U5 it is identical or approach it is identical
It is several to wait for that combo battery core forms one group；According to △ U6 by each fifth component be several 6th groups, by △ U6 it is identical or approach it is identical
It is several wait for combo battery core form one group.
Further include a step S100 before the step S110；
S100, multiple control parameters are preset, multiple control parameters include predetermined discharge electric current Id, the first predetermined electrification
Measure SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, pre- timing
Between T；
Multiple packet parameters are preset, multiple packet parameters include the grouping step value and grouping initial value, △ of △ U1
U2 grouping step value and be grouped initial value, △ U3 grouping step value and be grouped initial value, △ U4 grouping step value and point
The grouping step value and grouping initial value of group initial value, the grouping step value of △ U5 and grouping initial value and △ U6.
Optionally, the step S150 is specifically included：
Each dynamic DC impedance parameter is calculated, multiple dynamic DC impedance parameters include △ R1, △ R2, △ R3, △ R4, △
R5 and △ R6；Wherein, △ R1=△ U1/I1, △ R2=△ U2/I2, △ R3=△ U3/I1, △ R4=△ U4/I2, △ R5=
△ U5/I1, △ R6=△ U6/I2；
It is one group that each dynamic DC impedance parameter all same or identical several of approach, which are waited for that combo battery core is matched,；
It is described by each dynamic DC impedance parameter all same or approach identical several wait for combo battery core match be one group,
It specifically includes：
A batch is waited for that combo battery core is divided into several first groups according to △ R1, it is △ R1 is identical or approach is identical several waits matching
Group battery core forms one group；It is divided into several second groups by each first group according to △ R2, it is △ R2 is identical or approach is identical several waits for
Combo battery core forms one group；Be divided into several third groups by each second group according to △ R3, by △ R3 it is identical or approach it is identical several
Wait for that combo battery core forms one group；According to △ R4 by each third component be several 4th groups, if by △ R4 it is identical or approach it is identical
It is dry to wait for that combo battery core forms one group；Be divided into several 5th groups by each 4th group according to △ R5, by △ R5 it is identical or approach it is identical
It is several to wait for that combo battery core forms one group；According to △ R6 by each fifth component be several 6th groups, by △ R6 it is identical or approach it is identical
It is several wait for combo battery core form one group；
Further include a step S100 before the step S110；
S100, multiple control parameters are preset, multiple control parameters include predetermined discharge electric current Id, the first predetermined electrification
Measure SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, pre- timing
Between T；
Multiple packet parameters are preset, multiple packet parameters include the grouping step value and grouping initial value, △ of △ R1
R2 grouping step value and be grouped initial value, △ R3 grouping step value and be grouped initial value, △ R4 grouping step value and point
The grouping step value and grouping initial value of group initial value, the grouping step value of △ R5 and grouping initial value and △ R6.
Optionally, the step S120 is specifically included：
Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
First open-circuit voltage U1a obtains respectively the first both end voltage U1b when combo battery core is in predetermined time T, calculates △ U1=U1a-
U1b；
Combo battery core will respectively be waited for the second DC current I2 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
Second open-circuit voltage U2a obtains respectively the second both end voltage U2b when combo battery core is in predetermined time T, calculates △ U2=U2a-
U2b；
Combo battery core will respectively be waited for the first DC current I1 charging predetermined time T, before acquisition respectively waits for the charging of combo battery core
Third open-circuit voltage U3a obtains respectively third both end voltage U3b when combo battery core is in predetermined time T, calculates △ U3=U3b-
U3a；
Combo battery core will respectively be waited for the second DC current I2 charging predetermined time T, before acquisition respectively waits for the charging of combo battery core
4th open-circuit voltage U4a obtains respectively the 4th both end voltage U4b when combo battery core is in predetermined time T, calculates △ U4=U4b-
U4a。
Optionally, the step S140 is specifically included：
Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
5th open-circuit voltage U5a obtains respectively the 5th both end voltage U5b when combo battery core is in predetermined time T, calculates △ U5=U5a-
U5b；
Combo battery core will respectively be waited for the second DC current I2 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
6th open-circuit voltage U6a obtains respectively the 6th both end voltage U6b when combo battery core is in predetermined time T, calculates △ U6=U6a-
U6b。
Optionally, further include a step before the step S100：Multiple property of each battery core in multiple battery cores are obtained in advance
Energy index, multiple performance indicators include capacity, voltage, AC impedance and short time voltage storage change value, by each performance indicator
Several consistent battery cores form a batch and wait for combo battery core；
Described several battery cores that each performance indicator is consistent form a batch and wait for combo battery core, specifically include：According to appearance
Amount by multiple battery cores be divided into it is several first, several consistent battery cores of capacity are formed into a batch；According to voltage will it is each first
It is divided into several second batchs, several consistent battery cores of voltage is formed into a batch；Each second group is divided into according to AC impedance several
Several consistent battery cores of AC impedance are formed a batch by third batch；Each third is criticized according to short time voltage storage change value
It is divided into several 4th batches, several consistent battery cores of short time voltage storage change value, which are formed a batch, waits for combo battery core.
Optionally, predetermined discharge electric current Id is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core, the first predetermined band
Electricity SOC1 up to waits for the 20% of combo battery core total electricity；Predetermined charging current Ic is equal to predetermined discharge electric current Id, and second is pre-
Determine that carried charge SOC2 is minimum to wait for the 80% of combo battery core total electricity；
Predetermined time T is 10s, and the first DC current I1 is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core, the
Two DC current I2 are 1.0/ unit interval of battery core capacity C * for waiting for combo battery core.
Optionally, the first predetermined carried charge SOC1 is wait for combo battery core total electricity 10%；Second predetermined carried charge SOC2
To wait for the 90% of combo battery core total electricity.
Optionally, the step S140 further includes：It will respectively wait for that combo battery core is charged the predetermined time with the first DC current I1
T obtains the 7th △ U7 of voltage difference for respectively waiting for that the charging of combo battery core is front and back；It will respectively wait for combo battery core with the second DC current I2 chargings
Predetermined time T obtains the 8th voltage difference △ U8 for respectively waiting for that the charging of combo battery core is front and back；
Multiple voltage difference parameters further include △ U7 and △ U8.
Optionally, including battery core performance test apparatus and terminal, the terminal are electrically connected the battery core performance test apparatus；
The battery core performance test apparatus, for a batch to be waited for that combo battery core is discharged to first in advance with predetermined discharge electric current Id
Determine carried charge SOC1；Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for that combo battery core is discharged
Front and back the first open-circuit voltage U1a and the first both end voltage U1b；It will respectively wait for that combo battery core is predetermined with the second DC current I2 electric discharges
Time T obtains the second open-circuit voltage U2a and the second both end voltage U2b for respectively waiting for that the electric discharge of combo battery core is front and back；It will respectively wait for combo electricity
Core is charged predetermined time T with the first DC current I1, is obtained and is respectively waited for third open-circuit voltage U3a that the charging of combo battery core is front and back and the
Three both end voltage U3b；Combo battery core will respectively be waited for the second DC current I2 charging predetermined time T, acquisition respectively waits for that combo battery core is filled
The 4th open-circuit voltage U4a before and after electricity and the 4th both end voltage U4b；
The battery core performance test apparatus is additionally operable to respectively wait for that combo battery core charges to second in advance with predetermined charging current Ic
Determine carried charge SOC2；Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for that combo battery core is discharged
The 5th front and back open-circuit voltage U5a and the 5th both end voltage U5b；It will respectively wait for that combo battery core is predetermined with the second DC current I2 electric discharges
Time T obtains the 6th open-circuit voltage U6a and the 6th both end voltage U6b for respectively waiting for that the electric discharge of combo battery core is front and back；
The terminal includes setting unit, storage unit, control unit, sampling unit and data processing unit；
The setting unit is electrically connected the storage unit；The setting unit is used to preset multiple control parameters,
And each control parameter is stored to storage unit；Multiple control parameters include predetermined discharge electric current Id, the first predetermined carried charge
SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, predetermined time
T；
The setting unit is additionally operable to preset multiple packet parameters, and each packet parameters are stored to storage unit；
Multiple packet parameters include grouping step value and grouping initial value, the grouping step value of △ U2 and grouping initial value, △ of △ U1
U3 grouping step value and be grouped initial value, △ U4 grouping step value and be grouped initial value, △ U5 grouping step value and point
The grouping step value and grouping initial value of group initial value and △ U6；Or multiple packet parameters include △ R1 grouping step value and
It is grouped point of initial value, the grouping step value of △ R2 and grouping initial value, the grouping step value of △ R3 and grouping initial value, △ R4
Group step value and the grouping step value and grouping for being grouped initial value, the grouping step value of △ R5 and grouping initial value and △ R6 are initial
Value；
The storage unit is for storing each control parameter, each packet parameters and each performance parameter；Multiple performance parameter packets
Include U1a, U1b, U2a, U2b, U3a, U3b, U4a, U4b, U5a, U5b, U6a and U6b；
Described control unit is electrically connected the storage unit and the battery core performance test apparatus；Described control unit is used for
The work of battery core performance test apparatus is controlled according to each control parameter；
The sampling unit is electrically connected the storage unit and the battery core performance test apparatus；The sampling unit is used for
Each performance parameter of battery core is sampled by battery core performance test apparatus, and each performance parameter is stored to the storage unit；
The data processing unit is electrically connected the storage unit, for calculating each voltage difference parameter or each dynamic direct current
Impedance parameter, multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6, △ U1=U1a-U1b, △ U2
=U2a-U2b, △ U3=U3b-U3a, △ U4=U4b-U4a, △ U5=U5a-U5b, △ U6=U6a-U6b；Multiple dynamics are straight
Flow impedance parameter includes △ R1, △ R2, △ R3, △ R4, △ R5 and △ R6, △ R1=(U1a-U1b)/I1, △ R2=(U2a-
U2b)/I2, △ R3=(U3b-U3a)/I1, △ R4=(U4b-U4a)/I2, △ R5=(U5a-U5b)/I1, △ R6=(U6a-
U6b)/I2；The data processing unit is additionally operable to carry out combo according to result of calculation and each packet parameters.
Compared with prior art, the invention has the advantages that：
The present invention is by testing battery core in low electricity and full electricity condition, the short time dynamic electric voltage under DC current effect
Difference characterizes dynamic DC impedance characteristic of the battery core under DC current effect, to select dynamic DC impedance characteristic consistent
Battery core carry out combo, with reduce or even eliminate due to battery core dynamic DC impedance characteristic different band come battery pack it is hidden safely
Suffer from.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the flow for the multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching that the embodiment of the present invention one provides
Figure.
Fig. 2 is the flow chart for the step S120 that the embodiment of the present invention one provides.
Fig. 3 is the structure for the multi-series and parallel Li-ion batteries piles dynamic DC impedance combo system that the embodiment of the present invention five provides
Figure.
In figure：10, battery core bunkerage；20, terminal；21, setting unit；22, storage unit；23, control unit；24、
Sampling unit；25, data processing unit.
Specific implementation mode
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one
Referring to Fig. 1, present embodiments providing multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching, can choose
Choosing a batch waits for that close several of dynamic DC impedance characteristic in combo battery core wait for that combo battery core carries out combo, and this method includes：
Select the pre- step that a batch waits for combo battery core：
Multiple performance indicators of each battery core in multiple battery cores are obtained in advance, and multiple performance indicators include capacity, voltage, exchange
Several consistent battery cores of each performance indicator are formed a batch and wait for combo battery core by impedance and short time voltage storage change value.
Wherein, several consistent battery cores of performance indicator are formed into a batch and waits for combo battery core, specifically included：
According to capacity by multiple battery cores be divided into it is several first, several consistent battery cores of capacity are formed into a batch；According to
Each first is divided into several second batchs by voltage, several consistent battery cores of voltage are formed a batch；It will be each according to AC impedance
Second group is divided into several thirds batch, several consistent battery cores of AC impedance are formed a batch；It is stored and is become according to short time voltage
Each third batch is divided into several 4th batches by change value, several consistent battery cores of short time voltage storage change value, which are formed a batch, to be waited for
Combo battery core.
I.e. each 4th batch is that a batch waits for combo battery core.
It is understood that above according to the suitable of capacity, voltage, AC impedance and short time voltage storage change value grouping
Sequence is to set for ease of description, and sequencing can be adjusted arbitrarily.
Step S100, multiple control parameters are preset, multiple control parameters include predetermined discharge electric current Id, first predetermined
It is carried charge SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, pre-
Fix time T.
Step S110, a batch is waited for that combo battery core is discharged to the first predetermined carried charge SOC1 with predetermined discharge electric current Id.
In the present embodiment, the first predetermined carried charge SOC1 is wait for combo battery core total electricity 10%, is existed with testing battery core
Performance when low electricity condition.Since battery is generally in carried charge 50% or so, performance is almost the same, but in full electricity and low
Characteristic performance difference is apparent when electric, when especially low electric, therefore selects performance of the test battery core in low electricity condition.It can be with
Understand, the first predetermined electricity SOC1 can also be the electricity of other numerical value, such as 8%, 5%, as long as making to wait for combo battery core
In low electricity condition.It is generally acknowledged that battery core low electricity condition is its 20% state below of carried charge.
In the present embodiment, predetermined discharge electric current Id be wait for 0.2/ unit interval of battery core capacity C * of combo battery core, such as
In the specific example of the present invention, wait for that the battery core capacity C of combo is 2200mAh, predetermined discharge electric current Id is 440mA, i.e.,
Id=2200mAh*0.2/1h=440mA.Predetermined discharge electric current Id is smaller, is discharged to after the first predetermined electricity SOC1, respectively waits for
The performance test results difference with battery core is more apparent.Predetermined discharge electric current Id is too small, be discharged to the first predetermined electricity SOC1 when
Between can be long, therefore predetermined discharge electric current Id is set as when battery core capacity C 0.2/ units of * of combo battery core by the present embodiment
Between.
Step S120, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, and acquisition respectively waits for combo battery core
The front and back first voltage difference △ U1 of electric discharge；Combo battery core will respectively be waited for the second DC current I2 electric discharge predetermined time T, acquisition respectively waits for
The front and back second voltage difference △ U2 of combo battery core electric discharge；It will respectively wait for that combo battery core is charged predetermined time T with the first DC current I1,
Obtain the tertiary voltage difference △ U3 for respectively waiting for that the charging of combo battery core is front and back；It will respectively wait for that combo battery core is pre- with the second DC current I2 chargings
Fix time T, obtains the 4th voltage difference △ U4 for respectively waiting for that the charging of combo battery core is front and back.
Step S120 is specifically included：
Step S121, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, and acquisition respectively waits for combo battery core
The first open-circuit voltage U1a before electric discharge obtains respectively the first both end voltage U1b when combo battery core is in predetermined time T, calculates △
U1=U1a-U1b；
Step S122, combo battery core will be respectively waited for the second DC current I2 electric discharge predetermined time T, and acquisition respectively waits for combo battery core
The second open-circuit voltage U2a before electric discharge obtains respectively the second both end voltage U2b when combo battery core is in predetermined time T, calculates △
U2=U2a-U2b.
Step S123, combo battery core will be respectively waited for the first DC current I1 charging predetermined time T, and acquisition respectively waits for combo battery core
Third open-circuit voltage U3a before charging obtains respectively third both end voltage U3b when combo battery core is in predetermined time T, calculates △
U3=U3b-U3a.
Step S124, combo battery core will be respectively waited for the second DC current I2 charging predetermined time T, and acquisition respectively waits for combo battery core
The 4th open-circuit voltage U4a before charging obtains respectively the 4th both end voltage U4b when combo battery core is in predetermined time T, calculates △
U4=U4b-U4a.
In the present embodiment, predetermined time T is 10s, and the first DC current I1 is the battery core capacity C * for waiting for combo battery core
0.2/ unit interval, the second DC current I2 are 1.0/ unit interval of battery core capacity C * for waiting for combo battery core.
By taking step S121 as an example, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits matching
Both end voltage U1b of the group battery core in predetermined time T.Specific operation process is to make respectively to wait for the connection load of combo battery core, passes through tune
Control load makes respectively to wait for combo battery core with I1 constant-current discharge 10s, obtains the band respectively when combo battery core discharges 10s and carries both end voltage
U1b。
Under normal circumstances, the both end voltage of battery core is less than the open-circuit voltage of battery core before electric discharge, battery core when charging when electric discharge
Both end voltage is more than the open-circuit voltage of battery core before charging.Therefore, in the present embodiment, △ U1=U1a-U1b, and △ U3=U3b-
U3a, △ U1 and the △ U3 being calculated in this way are positive number, and △ U2 and △ U4 are also similar.It is understood that positive number is only
It is easy to understand, △ U1 etc. may be negative, positive negative does not influence combo.
It is understood that the sequence between four sub-steps that step S120 includes is unlimited.That is step S121, step
Sequence between S122, step S123 and step S124 is unlimited, and the method that simple reversed order obtains should all be in the guarantor of the present invention
It protects in range.
Step S130, it will respectively wait for that combo battery core charges to the second predetermined carried charge SOC2 with predetermined charging current Ic.
In the present embodiment, the second predetermined carried charge SOC2 is wait for combo battery core total electricity 90%, is existed with testing battery core
Performance when full electricity condition.It is understood that the second predetermined electricity SOC2 can also be the electricity of other numerical value, such as 92%,
95% etc., as long as making to wait for that combo battery core is in full electricity condition.It is generally acknowledged that battery core satisfy electricity condition be its carried charge 80% with
On state.
Charging current Ic and discharge current Id can be set according to practical application scene, in the present embodiment, predetermined to fill
Electric current Ic is equal to predetermined discharge electric current Id.I.e. predetermined charging current Ic is when battery core capacity C 0.2/ units of * of combo battery core
Between.
Step S140, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, and acquisition respectively waits for combo battery core
The 5th front and back voltage difference △ U5 of electric discharge；It will respectively wait for that combo battery core with the second DC current I2 electric discharge predetermined time T, respectively waits for combo
Battery core obtains the 6th front and back voltage difference △ U6 of electric discharge.
Step S140 is specifically included：
Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
5th open-circuit voltage U5a obtains the 5th both end voltage U5b respectively when combo battery core discharges predetermined time T, calculates △ U5=
U5a-U5b；
Combo battery core will respectively be waited for the second DC current I2 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
6th open-circuit voltage U6a obtains the 6th both end voltage U6b respectively when combo battery core discharges predetermined time T, calculates △ U6=
U6a-U6b。
It is understood that the sequence between two sub-steps that step S140 includes is unlimited, simple reversed order obtains
Method should all be within the scope of the present invention.
Battery core is under full electricity condition, and the difference of the front and back voltage difference of short time charging of each battery core is smaller, therefore the present embodiment
Middle selection test △ U5 and △ U6.
Step S120 must after step silo, and step S140 must after step s 130, by step S110 and step
Rapid S120 is considered as the first big step, and step S130 and step S140 are considered as the second largest step.It is understood that the first big step
Sequence between the second largest step is unlimited, and the method that simple reversed order obtains should all be within the scope of the present invention.
Step S150, to respectively waiting for that combo battery core carries out combo, if each voltage difference parameter all same or approach is identical
It is one group that dry, which is waited for that combo battery core is matched, and multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6.
Step S150 is specifically included：
A batch is waited for that combo battery core is divided into several first groups according to △ U1, it is △ U1 is identical or approach is identical several waits matching
Group battery core forms one group；It is divided into several second groups by each first group according to △ U2, it is △ U2 is identical or approach is identical several waits for
Combo battery core forms one group；Be divided into several third groups by each second group according to △ U3, by △ U3 it is identical or approach it is identical several
Wait for that combo battery core forms one group；According to △ U4 by each third component be several 4th groups, if by △ U4 it is identical or approach it is identical
It is dry to wait for that combo battery core forms one group；Be divided into several 5th groups by each 4th group according to △ U5, by △ U5 it is identical or approach it is identical
It is several to wait for that combo battery core forms one group；According to △ U6 by each fifth component be several 6th groups, by △ U6 it is identical or approach it is identical
It is several wait for combo battery core form one group.
It is understood that the sequence above according to △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6 groupings is in order to just
It is set in description, sequencing can be adjusted arbitrarily.
In the present embodiment, it is point according to each voltage difference parameter, each voltage difference parameter according to each voltage difference parameter combo
Group step value and the grouping for being grouped initial value progress.It is the difference of the maxima and minima in each group when being grouped to be grouped step value.
It is the minimum value or maximum value in all groups to be grouped initial value.Such as the grouping step value for setting △ U1 is grouped initial as 5mV
It is 10mV to be worth (minimum value), then it is one group to match several battery cores that △ U1 are 10-15mV, by several electricity that △ U1 are 15-20mV
It is one group that core, which is matched, and so on, until needed combo battery core combo is finished.
Grouping step value can be selected according to the demand of user.Grouping initial value can be set according to user demand, also may be used
It is set as calculating the minimum value or maximum value in each voltage difference parameter obtained with fixed.
Then in the present embodiment, step S100 further includes：Multiple packet parameters are preset, multiple packet parameters include △
U1 grouping step value and be grouped initial value, △ U2 grouping step value and be grouped initial value, △ U3 grouping step value and point
Point of group initial value, the grouping step value of △ U4 and grouping initial value, the grouping step value of △ U5 and grouping initial value and △ U6
Group step value and grouping initial value.
It is understood that other statistical method can also be utilized, combo is carried out according to each voltage difference parameter.It is with △ U1
Example, the variance for the △ U1 for respectively waiting for combo battery core can be calculated, by △ U1 variances it is excessive wait for combo battery core exclude, it is remaining to wait matching
Group battery core is divided into one group.
The present embodiment is by testing battery core in low electricity and full electricity condition, the short time dynamic electric voltage under DC current effect
Difference characterizes dynamic DC impedance characteristic of the battery core under DC current effect.The present embodiment has selected dynamic DC impedance special
Property consistent battery core carry out combo, to reduce or even eliminate the battery come due to battery core dynamic DC impedance characteristic different band
Group security risk.
Embodiment two
The present embodiment changes step S150 and each packet parameters on the basis of embodiment one.
In the present embodiment, step S150 is specifically included：
Each dynamic DC impedance parameter is calculated, multiple dynamic DC impedance parameters include △ R1, △ R2, △ R3, △ R4, △
R5 and △ R6；Wherein, △ R1=△ U1/I1, △ R2=△ U2/I2, △ R3=△ U3/I1, △ R4=△ U4/I2, △ R5=
△ U5/I1, △ R6=△ U6/I2；
It is one group that each dynamic DC impedance parameter all same or identical several of approach, which are waited for that combo battery core is matched,.
Wherein, it is one each dynamic DC impedance parameter all same or identical several of approach to be waited for that combo battery core is matched
Group specifically includes：
A batch is waited for that combo battery core is divided into several first groups according to △ R1, it is △ R1 is identical or approach is identical several waits matching
Group battery core forms one group；It is divided into several second groups by each first group according to △ R2, it is △ R2 is identical or approach is identical several waits for
Combo battery core forms one group；Be divided into several third groups by each second group according to △ R3, by △ R3 it is identical or approach it is identical several
Wait for that combo battery core forms one group；According to △ R4 by each third component be several 4th groups, if by △ R4 it is identical or approach it is identical
It is dry to wait for that combo battery core forms one group；Be divided into several 5th groups by each 4th group according to △ R5, by △ R5 it is identical or approach it is identical
It is several to wait for that combo battery core forms one group；According to △ R6 by each fifth component be several 6th groups, by △ R6 it is identical or approach it is identical
It is several wait for combo battery core form one group.
It is understood that the sequence above according to △ R1, △ R2, △ R3, △ R4, △ R5 and △ R6 groupings is in order to just
It is set in description, sequencing can be adjusted arbitrarily.
In the present embodiment, multiple packet parameters include the grouping step value of △ R1 and the grouping for being grouped initial value, △ R2
Step value and grouping initial value, the grouping step value of △ R3 and grouping initial value, the grouping step value of △ R4 and grouping initial value,
The grouping step value of △ R5 and the grouping step value and grouping initial value for being grouped initial value and △ R6.
In the present embodiment, finally according to each dynamic DC impedance parameter combo, due to each dynamic DC impedance parameter be by
Each voltage difference parameter is calculated, according to the result of each dynamic DC impedance parameter combo and according to each voltage difference parameter combo
It as a result should be consistent.Each dynamic DC impedance parameter can more intuitively show the dynamic DC impedance characteristic of battery core.
Embodiment three
The present embodiment changes step S140 on the basis of embodiment one.
In the present embodiment, step S140 includes：It will respectively wait for that combo battery core is discharged the predetermined time with the first DC current I1
T obtains the voltage difference △ U5 for respectively waiting for that the electric discharge of combo battery core is front and back；It will respectively wait for that combo battery core is predetermined with the second DC current I2 electric discharges
Time T obtains the voltage difference △ U6 for respectively waiting for that the electric discharge of combo battery core is front and back；It will respectively wait for combo battery core with the first DC current I1 chargings
Predetermined time T obtains the voltage difference △ U7 for respectively waiting for that the charging of combo battery core is front and back；It will respectively wait for combo battery core with the second DC current I2
Charge predetermined time T, obtains the voltage difference △ U8 for respectively waiting for that the charging of combo battery core is front and back.
Then in the present embodiment, two voltage difference parameters are correspondingly increased：△ U7 and △ U8；Increase two grouping ginsengs
Number：The grouping step value of △ U7 and the grouping step value and grouping initial value for being grouped initial value and △ U8.
I.e. in the present embodiment, step S150 includes：It is to respectively waiting for that combo battery core carries out combo, each voltage difference parameter is identical
Or approach identical several wait for combo battery core match be one group, multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4,
△ U5, △ U6, △ U7 and △ U8.
Step S100 includes：Multiple control parameters are preset, multiple control parameters include predetermined discharge electric current Id, first
Predetermined carried charge SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current
I2, predetermined time T；
Multiple packet parameters are preset, multiple packet parameters include the grouping step value and grouping initial value, △ of △ U1
U2 grouping step value and be grouped initial value, △ U3 grouping step value and be grouped initial value, △ U4 grouping step value and point
The grouping of group initial value, the grouping step value of △ U5 and grouping initial value, the grouping step value of △ U6 and grouping initial value, △ U7
The grouping step value and grouping initial value of step value and grouping initial value and △ U8.
The present embodiment is also tested for battery core in full electricity condition, charges and make in DC current on the basis of embodiment one
Short time dynamic electric pressure difference under.Dynamic DC impedance of the battery core under DC current effect can be more accurately characterized to become
Change, to make the battery core dynamic DC impedance characteristic in the battery core group that combo obtains be more nearly.
Example IV
The present embodiment further describes the multi-series and parallel lithium ion battery of the present invention using a battery core sample as specific example
Group dynamic DC impedance method for group matching.In the present embodiment, it is with 18650 type of cylindrical electrical core of a battery core capacity 2200mAh
Specific example.
First by battery core to be measured with the current discharge of 440mA to carried charge be 10%.
The first open-circuit voltage U1a that test obtains battery core to be measured is 3300mV, and battery core to be measured is straight with first by loading
Galvanic electricity stream I1 (440mA) discharges 10 seconds, and the first both end voltage U1b of battery core to be measured is 3280mV when test obtains 10s.
Calculate △ U1=U1a-U1b=(3300-3280) mV=20mV.
0.04545 Ω of △ R1=△ U1/I1=20mA/440mV ≈=45.45m Ω.
Battery core i.e. to be measured is in belt current 10% with the direct-current discharge impedance of 440mA DC currents electric discharge for 45.45m Ω.
Similarly, continue to test, the second open-circuit voltage U2a for obtaining battery core to be measured is 3290mV, by battery core to be measured with the
Two DC current I2 (2200mA) discharge 10 seconds, and the second both end voltage U2b of battery core to be measured is when test obtains 10s
3150mVmV.Calculate △ U2=U2a-U2b=140mV, △ R2=△ U2/I2 ≈ 63.64m Ω
The third open-circuit voltage U3a that test obtains battery core to be measured is 3288mV, then by battery core to be measured with the first DC current
I1 (440mA) charges 10 seconds, and the third both end voltage U3b of battery core to be measured is 3310mV when test obtains 10s.Calculate △ U3=
U3b-U3a=22mV, △ R3=△ U3/I1=50.00m Ω.
The 4th open-circuit voltage U4a that test obtains battery core to be measured is 3291mV, then by battery core to be measured with the second DC current
I2 (2200mA) charges 10 seconds, and the 4th both end voltage U4b of battery core to be measured is 3430mV when test obtains 10s.Calculate △ U4
=U4b-U4a=139mV, △ R4=△ U4/I2 ≈ 63.18m Ω.
Then battery core to be measured is charged into carried charge as 90% with the electric current of 440mA.
The 5th open-circuit voltage U5a that test obtains battery core to be measured is 4050mV, then by battery core to be measured with the first DC current
I1 (440mA) discharges 10 seconds, and the 5th both end voltage U5b of battery core to be measured is 4032mV when test obtains 10s.Calculate △ U5=
U5a-U5b=18mV, △ R5=△ U5/I1 ≈ 40.91m Ω.
The 6th open-circuit voltage U6a that test obtains battery core to be measured is 4044mV, then by battery core to be measured with the second DC current
I2 (220mA) discharges 10 seconds, and the 6th both end voltage U6b of battery core to be measured is 3958mV when test obtains 10s.Calculate △ U6=
U6a-U6b=86mV, △ R6=△ U6/I2 ≈ 39.09m Ω.
The dynamic DC impedance parameter for obtaining the same battery core through the above steps is as follows:
| △R1 | △R2 | △R3 | △R4 | △R5 | △R6 |
| 45.45mΩ | 63.64mΩ | 50.00mΩ | 63.18mΩ | 40.91mΩ | 39.09mΩ |
From in above table it can be seen that DC impedance of the same battery core under different conditions be in variation.Pass through weight
Multiple above step, can obtain the dynamic DC impedance parameter of multiple battery cores.Set the grouping step-length of dynamic DC impedance parameter
After value and grouping initial value, multiple battery cores can be grouped by software such as excel etc., be moved with selecting in multiple battery cores
State DC impedance parameter is identical or approaches several identical battery cores.The battery core selected is subjected to combo, can solve or reduce
It is hidden to be directed at the safety for overcharging or putting excessively that battery pack occurs because dynamic DC impedance is inconsistent for different battery cores in same group of battery pack
Suffer from.
The present embodiment further describes the multi-series and parallel lithium ion battery of the present invention using a battery core sample as specific example
Group dynamic DC impedance method for group matching.
Embodiment five
Referring to Fig. 3, present embodiments providing a kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance combo system, wrap
It includes：Battery core performance test apparatus 10 and terminal 20.Terminal 20 is electrically connected battery core performance test apparatus 10.
Battery core performance test apparatus 10, for a batch to be waited for that combo battery core is discharged to first with predetermined discharge electric current Id and makes a reservation for
Carried charge SOC1；Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, before acquisition respectively waits for the electric discharge of combo battery core
The first open-circuit voltage U1a afterwards and the first both end voltage U1b；It will respectively wait for combo battery core with the second pre- timing of DC current I2 electric discharges
Between T, obtain the second open-circuit voltage U2a and the second both end voltage U2b for respectively waiting for that the electric discharge of combo battery core is front and back；It will respectively wait for combo battery core
With the first DC current I1 charging predetermined time T, the third open-circuit voltage U3a and third for respectively waiting for that the charging of combo battery core is front and back are obtained
Both end voltage U3b；Combo battery core will respectively be waited for the second DC current I2 charging predetermined time T, acquisition respectively waits for that combo battery core charges
The 4th front and back open-circuit voltage U4a and the 4th both end voltage U4b.
Battery core performance test apparatus is additionally operable to respectively wait for that combo battery core charges to the second predetermined band with predetermined charging current Ic
Electricity SOC2；Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for before and after the electric discharge of combo battery core
The 5th open-circuit voltage U5a and the 5th both end voltage U5b；It will respectively wait for that combo battery core is discharged the predetermined time with the second DC current I2
T obtains the 6th open-circuit voltage U6a and the 6th both end voltage U6b for respectively waiting for that the electric discharge of combo battery core is front and back.
Terminal 20 includes setting unit 21, storage unit 22, control unit 23, sampling unit 24 and data processing unit
25。
Setting unit 21 is electrically connected the storage unit 22.Setting unit 21 is used to preset multiple control parameters, and
Each control parameter is stored to storage unit 22, multiple control parameters include predetermined discharge electric current Id, the first predetermined carried charge
SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, predetermined time
T。
Setting unit 21 is additionally operable to preset multiple packet parameters, and each packet parameters are stored to storage unit 22.
Multiple packet parameters include grouping step value and grouping initial value, the grouping step value of △ U2 and grouping initial value, △ of △ U1
U3 grouping step value and be grouped initial value, △ U4 grouping step value and be grouped initial value, △ U5 grouping step value and point
The grouping step value and grouping initial value of group initial value and △ U6；Or multiple packet parameters include △ R1 grouping step value and
It is grouped point of initial value, the grouping step value of △ R2 and grouping initial value, the grouping step value of △ R3 and grouping initial value, △ R4
Group step value and the grouping step value and grouping for being grouped initial value, the grouping step value of △ R5 and grouping initial value and △ R6 are initial
Value.
Storage unit 22 is for storing each control parameter, each packet parameters and each performance parameter.Multiple performance parameters include
U1a, U1b, U2a, U2b, U3a, U3b, U4a, U4b, U5a, U5b, U6a and U6b.
Control unit 23 is electrically connected storage unit 22 and battery core performance test apparatus, and control unit 23 is used for according to each control
The work of state modulator battery core performance test apparatus.
Sampling unit 24 is electrically connected storage unit 22 and battery core performance test apparatus, and sampling unit 24 is used to pass through battery core
Each performance parameter of energy test equipment sampling battery core, and each performance parameter is stored to storage unit 22.
Data processing unit 25 is electrically connected storage unit 22, for calculating each voltage difference parameter or each dynamic DC impedance
Parameter.Multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6, △ U1=U1a-U1b, △ U2=
U2a-U2b, △ U3=U3b-U3a, △ U4=U4b-U4a, △ U5=U5a-U5b, △ U6=U6a-U6b；Multiple dynamic direct currents
Impedance parameter includes △ R1, △ R2, △ R3, △ R4, △ R5 and △ R6, △ R1=(U1a-U1b)/I1, △ R2=(U2a-
U2b)/I2, △ R3=(U3b-U3a)/I1, △ R4=(U4b-U4a)/I2, △ R5=(U5a-U5b)/I1, △ R6=(U6a-
U6b)/I2.Data processing unit 25 is additionally operable to carry out combo according to result of calculation and each packet parameters.
A kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance combo system provided in this embodiment can be according to battery core
Dynamic DC impedance to battery core carry out combo, battery pack can be efficiently reduced since the dynamic DC impedance difference of battery core is led
The security risk of cause.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching, which is characterized in that including：
S110, a batch being waited for, combo battery core is discharged to the first predetermined carried charge SOC1 with predetermined discharge electric current Id；
S120, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for before and after the electric discharge of combo battery core
First voltage difference △ U1；Combo battery core will respectively be waited for the second DC current I2 electric discharge predetermined time T, acquisition respectively waits for combo battery core
The front and back second voltage difference △ U2 of electric discharge；Combo battery core will respectively be waited for the first DC current I1 charging predetermined time T, acquisition respectively waits for
The front and back tertiary voltage difference △ U3 of combo battery core charging；It will respectively wait for that combo battery core is charged predetermined time T with the second DC current I2,
Obtain the 4th voltage difference △ U4 for respectively waiting for that the charging of combo battery core is front and back；
S130, it will respectively wait for that combo battery core charges to the second predetermined carried charge SOC2 with predetermined charging current Ic；
S140, combo battery core will be respectively waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for before and after the electric discharge of combo battery core
The 5th voltage difference △ U5；It will respectively wait for that combo battery core with the second DC current I2 electric discharge predetermined time T, respectively waits for that combo battery core obtains
The 6th front and back voltage difference △ U6 of electric discharge；
S150, to respectively wait for combo battery core carry out combo, by each voltage difference parameter all same or approach identical several wait matching
It is one group that group battery core, which is matched, and multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6.
2. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 1, which is characterized in that institute
Step S150 is stated to specifically include：
A batch is waited for that combo battery core is divided into several first groups according to △ U1, by △ U1 it is identical or approach it is identical it is several wait for combo electricity
Core forms one group；It is divided into several second groups by each first group according to △ U2, it is △ U2 is identical or approach is identical several waits for combo
Battery core forms one group；It is divided into several third groups by each second group according to △ U3, it is △ U3 is identical or approach is identical several waits matching
Group battery core forms one group；By each third component it is several 4th groups according to △ U4, it is △ U4 is identical or approach is identical several waits for
Combo battery core forms one group；Be divided into several 5th groups by each 4th group according to △ U5, by △ U5 it is identical or approach it is identical several
Wait for that combo battery core forms one group；According to △ U6 by each fifth component be several 6th groups, if by △ U6 it is identical or approach it is identical
It is dry to wait for that combo battery core forms one group.
Further include a step S100 before the step S110；
S100, multiple control parameters are preset, multiple control parameters include predetermined discharge electric current Id, the first predetermined carried charge
SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, predetermined time
T；
Multiple packet parameters are preset, multiple packet parameters include the grouping step value and grouping initial value, △ U2 of △ U1
It is grouped step value and grouping initial value, the grouping step value of △ U3 and grouping initial value, the grouping step value of △ U4 and grouping just
The grouping step value and grouping initial value of initial value, the grouping step value of △ U5 and grouping initial value and △ U6.
3. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 1, which is characterized in that institute
Step S150 is stated to specifically include：
Calculate each dynamic DC impedance parameter, multiple dynamic DC impedance parameters include △ R1, △ R2, △ R3, △ R4, △ R5 and
△R6；Wherein, △ R1=△ U1/I1, △ R2=△ U2/I2, △ R3=△ U3/I1, △ R4=△ U4/I2, △ R5=△ U5/
I1, △ R6=△ U6/I2；
It is one group that each dynamic DC impedance parameter all same or identical several of approach, which are waited for that combo battery core is matched,；
It is described that each dynamic DC impedance parameter all same or identical several of approach are waited for into combo battery core with being one group, specifically
Including：
A batch is waited for that combo battery core is divided into several first groups according to △ R1, by △ R1 it is identical or approach it is identical it is several wait for combo electricity
Core forms one group；It is divided into several second groups by each first group according to △ R2, it is △ R2 is identical or approach is identical several waits for combo
Battery core forms one group；It is divided into several third groups by each second group according to △ R3, it is △ R3 is identical or approach is identical several waits matching
Group battery core forms one group；By each third component it is several 4th groups according to △ R4, it is △ R4 is identical or approach is identical several waits for
Combo battery core forms one group；Be divided into several 5th groups by each 4th group according to △ R5, by △ R5 it is identical or approach it is identical several
Wait for that combo battery core forms one group；According to △ R6 by each fifth component be several 6th groups, if by △ R6 it is identical or approach it is identical
It is dry to wait for that combo battery core forms one group；
Further include a step S100 before the step S110；
S100, multiple control parameters are preset, multiple control parameters include predetermined discharge electric current Id, the first predetermined carried charge
SOC1, predetermined charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, predetermined time
T；
Multiple packet parameters are preset, multiple packet parameters include the grouping step value and grouping initial value, △ R2 of △ R1
It is grouped step value and grouping initial value, the grouping step value of △ R3 and grouping initial value, the grouping step value of △ R4 and grouping just
The grouping step value and grouping initial value of initial value, the grouping step value of △ R5 and grouping initial value and △ R6.
4. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 1, which is characterized in that institute
Step S120 is stated to specifically include：
It will respectively wait for that combo battery core with the first DC current I1 electric discharge predetermined time T, obtains first before respectively waiting for the electric discharge of combo battery core
Open-circuit voltage U1a obtains respectively the first both end voltage U1b when combo battery core is in predetermined time T, calculates △ U1=U1a-U1b；
It will respectively wait for that combo battery core with the second DC current I2 electric discharge predetermined time T, obtains second before respectively waiting for the electric discharge of combo battery core
Open-circuit voltage U2a obtains respectively the second both end voltage U2b when combo battery core is in predetermined time T, calculates △ U2=U2a-U2b；
It will respectively wait for that combo battery core with the first DC current I1 charging predetermined time T, obtains the third before respectively waiting for the charging of combo battery core
Open-circuit voltage U3a obtains respectively third both end voltage U3b when combo battery core is in predetermined time T, calculates △ U3=U3b-U3a；
It will respectively wait for that combo battery core with the second DC current I2 charging predetermined time T, obtains the 4th before respectively waiting for the charging of combo battery core
Open-circuit voltage U4a obtains respectively the 4th both end voltage U4b when combo battery core is in predetermined time T, calculates △ U4=U4b-U4a.
5. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 1, which is characterized in that institute
Step S140 is stated to specifically include：
It will respectively wait for that combo battery core with the first DC current I1 electric discharge predetermined time T, obtains the 5th before respectively waiting for the electric discharge of combo battery core
Open-circuit voltage U5a obtains respectively the 5th both end voltage U5b when combo battery core is in predetermined time T, calculates △ U5=U5a-U5b；
It will respectively wait for that combo battery core with the second DC current I2 electric discharge predetermined time T, obtains the 6th before respectively waiting for the electric discharge of combo battery core
Open-circuit voltage U6a obtains respectively the 6th both end voltage U6b when combo battery core is in predetermined time T, calculates △ U6=U6a-U6b.
6. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 2 or 3, feature exist
In the step S100 further includes before a step：Multiple performance indicators of each battery core in multiple battery cores, Duo Gexing are obtained in advance
Can index include capacity, voltage, AC impedance and short time voltage storage change value, by consistent several of each performance indicator
Battery core forms a batch and waits for combo battery core；
Described several battery cores that each performance indicator is consistent form a batch and wait for combo battery core, specifically include：It will according to capacity
Multiple battery cores be divided into it is several first, several consistent battery cores of capacity are formed into a batch；Each first is divided into according to voltage
Several consistent battery cores of voltage are formed a batch by several second batchs；It is divided into several thirds by each second group according to AC impedance
Batch, several consistent battery cores of AC impedance are formed into a batch；Each third batch is divided into according to short time voltage storage change value
Several 4th batches, several consistent battery cores of short time voltage storage change value are formed into a batch and wait for combo battery core.
7. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 1, which is characterized in that pre-
It is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core to determine discharge current Id, and the first predetermined carried charge SOC1 up to waits matching
The 20% of group battery core total electricity；It is minimum that predetermined charging current Ic is equal to predetermined discharge electric current Id, the second predetermined carried charge SOC2
Wait for the 80% of combo battery core total electricity；
Predetermined time T is 10s, and the first DC current I1 is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core, and second is straight
Galvanic electricity stream I2 is 1.0/ unit interval of battery core capacity C * for waiting for combo battery core.
8. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 7, which is characterized in that the
One predetermined carried charge SOC1 is wait for combo battery core total electricity 10%；Second predetermined carried charge SOC2 is to wait for combo battery core total electricity
90%.
9. multi-series and parallel Li-ion batteries piles dynamic DC impedance method for group matching according to claim 1, which is characterized in that institute
Stating step S140 further includes：Combo battery core will respectively be waited for the first DC current I1 charging predetermined time T, acquisition respectively waits for combo battery core
Front and back the 7th △ U7 of voltage difference of charging；Combo battery core will respectively be waited for the second DC current I2 charging predetermined time T, acquisition respectively waits for
The 8th front and back voltage difference △ U8 of combo battery core charging；
Multiple voltage difference parameters further include △ U7 and △ U8.
10. a kind of multi-series and parallel Li-ion batteries piles dynamic DC impedance combo system, which is characterized in that including battery core performance test
Equipment and terminal, the terminal are electrically connected the battery core performance test apparatus；
The battery core performance test apparatus, for a batch to be waited for that combo battery core is discharged to the first predetermined band with predetermined discharge electric current Id
Electricity SOC1；Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for before and after the electric discharge of combo battery core
The first open-circuit voltage U1a and the first both end voltage U1b；It will respectively wait for that combo battery core is discharged the predetermined time with the second DC current I2
T obtains the second open-circuit voltage U2a and the second both end voltage U2b for respectively waiting for that the electric discharge of combo battery core is front and back；To respectively wait for combo battery core with
First DC current I1 charging predetermined time T, obtain the third open-circuit voltage U3a and third two for respectively waiting for that the charging of combo battery core is front and back
Terminal voltage U3b；Combo battery core will respectively be waited for the second DC current I2 charging predetermined time T, before acquisition respectively waits for the charging of combo battery core
The 4th open-circuit voltage U4a afterwards and the 4th both end voltage U4b；
The battery core performance test apparatus is additionally operable to respectively wait for that combo battery core charges to the second predetermined band with predetermined charging current Ic
Electricity SOC2；Combo battery core will respectively be waited for the first DC current I1 electric discharge predetermined time T, acquisition respectively waits for before and after the electric discharge of combo battery core
The 5th open-circuit voltage U5a and the 5th both end voltage U5b；It will respectively wait for that combo battery core is discharged the predetermined time with the second DC current I2
T obtains the 6th open-circuit voltage U6a and the 6th both end voltage U6b for respectively waiting for that the electric discharge of combo battery core is front and back；
The terminal includes setting unit, storage unit, control unit, sampling unit and data processing unit；
The setting unit is electrically connected the storage unit；The setting unit is used to preset multiple control parameters, and will
Each control parameter is stored to storage unit；Multiple control parameters include predetermined discharge electric current Id, the first predetermined carried charge SOC1, pre-
Determine charging current Ic, the second predetermined belt current SOC2, the first DC current I1, the second DC current I2, predetermined time T；
The setting unit is additionally operable to preset multiple packet parameters, and each packet parameters are stored to storage unit；It is multiple
Packet parameters include grouping step value and grouping initial value, the grouping step value of △ U2 and grouping initial value, △ U3 of △ U1
It is grouped step value and grouping initial value, the grouping step value of △ U4 and grouping initial value, the grouping step value of △ U5 and grouping just
The grouping step value of initial value and △ U6 and grouping initial value；Or multiple packet parameters include grouping step value and the grouping of △ R1
The grouping step of initial value, the grouping step value of △ R2 and grouping initial value, the grouping step value of △ R3 and grouping initial value, △ R4
The grouping step value and grouping initial value of long value and grouping initial value, the grouping step value of △ R5 and grouping initial value and △ R6；
The storage unit is for storing each control parameter, each packet parameters and each performance parameter；Multiple performance parameters include
U1a, U1b, U2a, U2b, U3a, U3b, U4a, U4b, U5a, U5b, U6a and U6b；
Described control unit is electrically connected the storage unit and the battery core performance test apparatus；Described control unit is used for basis
The work of each control parameter control battery core performance test apparatus；
The sampling unit is electrically connected the storage unit and the battery core performance test apparatus；The sampling unit is for passing through
Battery core performance test apparatus samples each performance parameter of battery core, and each performance parameter is stored to the storage unit；
The data processing unit is electrically connected the storage unit, for calculating each voltage difference parameter or each dynamic DC impedance
Parameter, multiple voltage difference parameters include △ U1, △ U2, △ U3, △ U4, △ U5 and △ U6, △ U1=U1a-U1b, △ U2=
U2a-U2b, △ U3=U3b-U3a, △ U4=U4b-U4a, △ U5=U5a-U5b, △ U6=U6a-U6b；Multiple dynamic direct currents
Impedance parameter includes △ R1, △ R2, △ R3, △ R4, △ R5 and △ R6, △ R1=(U1a-U1b)/I1, △ R2=(U2a-
U2b)/I2, △ R3=(U3b-U3a)/I1, △ R4=(U4b-U4a)/I2, △ R5=(U5a-U5b)/I1, △ R6=(U6a-
U6b)/I2；The data processing unit is additionally operable to carry out combo according to result of calculation and each packet parameters.
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