CN105186027B - A kind of combined method of combined Li ion cells group - Google Patents

A kind of combined method of combined Li ion cells group Download PDF

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Publication number
CN105186027B
CN105186027B CN201510336067.7A CN201510336067A CN105186027B CN 105186027 B CN105186027 B CN 105186027B CN 201510336067 A CN201510336067 A CN 201510336067A CN 105186027 B CN105186027 B CN 105186027B
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module
level
capacity
voltage
internal resistance
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CN105186027A (en
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刘钱根
曹汉标
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JIANGXI DBK CO., LTD.
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JIANGXI DBK Co Ltd
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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • 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
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a kind of combined method of novel combination type Li-ion batteries piles, monomer small-capacity cells are first connected, then mode in parallel is combined, or take string and multi-level approach is combined（Such as string and mode/string and string mode/string and go here and there and string mode ...), every grade of series unit by protection board control overshoot, cross and put, take power-supply management system control in the battery pack afterbody of more than 60V voltages, it is ensured that security.

Description

A kind of combined method of combined Li ion cells group
Technical field
Technical field
The present invention relates to the technical field of the combination of Li-ion batteries piles, more particularly to a kind of combined Li ion electricity The combined method of pond group.
Background technology
It has been widely used in all kinds of communication Instruments, notebook computer, digital phase since lithium ion battery commercialization since 1991 Machine, mobile DVD, video camera, MP3, electric tool, electric bicycle and electric automobile product.Lithium battery monomer is combined into The application of lithium battery group is increasingly extensive.
At present, the application of market battery pack is directly connected into required battery pack according to cell capacity and voltage Capacity and voltage, or cell first increase capacity in parallel, then connect and increase alive combination is taken, so as to realize electricity The making and extensive use of pond group.Its in actual use, protection circuit controls the overcharging of each series unit, crosses and the peace such as puts All risk insurance protective function, but easily can in discharge and recharge in the presence of cell failure in certain a string or protection board string or global failure Cause the overall directly failure of battery pack, and then cause the potential safety hazards such as on fire, blast.
The content of the invention
It is an object of the invention to provide a kind of combined method of combined Li ion cells group, meets lithium ion battery safety While the requirement used, simplify combo flow, improve combo rate and process yield.
The technical solution adopted by the present invention is：
A kind of combined method of combined Li ion cells group, comprises the following steps：
A：If the volumetric(al) standards of cell is：C is nominal, using the volumetric(al) standards set as boundary, measures cell Capacity C, when the capacity C of cell is nominal less than normal capacity C, it is determined as unqualified battery, abandons；When cell When capacity C is nominal more than or equal to normal capacity C, it is determined as spec battery；
B：The spec battery selected in step A is divided into different capacity class according to amount of capacity, and identified；
C：The cell for having divided capacity class in step B is carried out to mend electricity, the magnitude of voltage U for adding to setting is set, and Shelve a period of time；
D：The measurement of voltage and internal resistance is carried out to the cell after being shelved in step C, marks off pressure drop class and internal resistance Class；
D1：Measure voltage and stepping；Voltage measurement is carried out to each cell, and is divided into two class；Draw Minute mark standard is：Set qualified voltage value to close as U, and stepping difference threshold value is U thresholds；
D1-1：When the measurement voltage U of cell, which is surveyed, is less than qualified voltage value U conjunctions, it is determined as unqualified battery, puts Abandon；
D1-2：When the measurement voltage U of cell, which surveys, to be closed in qualified voltage value U between stepping difference threshold value U thresholds, It is determined as voltage order one shelves；And identify；
D1-3：Between magnitude of voltage U of the measurement voltage U surveys of cell in stepping difference threshold value U thresholds and setting is set When, it is determined as secondary voltage shelves；And identify；
D2：Measure internal resistance and stepping；
D2-1：Internal resistance measurement is carried out to the cell that voltage class is divided in step D1-2 and D1-3, sets internal resistance mark Quasi- value is R standards；Internal resistance allowable error value is missed for R；
D2-2：In the range of allowable error R of the internal resistance measurement value R surveys in internal resistance standard value R standards of cell is missed, It is determined as spec battery；
D2-3：Missed when the internal resistance measurement value R of cell surveys the allowable error R in internal resistance standard value R standards outside scope, It is determined as unqualified battery, abandons；
E：Cell after being identified in above-mentioned steps C and step D is carried out after battery pack is first gone here and there and formula combines, combination Standard is：Series connection is using capacity class as main fixed reference feature, using pressure drop class as secondary fixed reference feature；It is in parallel using internal resistance class as Primary Reference feature；
E1：First, N1 modules, i.e. previous module are established in series connection；
Selected from low to high according to capacity class, same pressure drop class is selected according to pressure drop class in the module of same rank Battery, so as to select X cell to be connected, the battery pack both ends after series connection, which are connected to, to prevent from overcharging, crosses the guarantor put On backplate, that is, a previous module is constituted, X is the integer at least above 2；Now, the capacity of a previous module is X single The capacity C 1 of the cell of minimum capacity in body battery, the voltage of a previous module for X cell voltage it And V1, the overall internal resistance R1 after the internal resistance of a previous module is measured using new measurement result as previous module；
E2：Secondly, N2 modules, i.e. two level module are established in parallel connection；
Using the new overall internal resistance of previous module as main fixed reference feature, Y previous module in step E1 is selected, by Y Individual previous module is in parallel, that is, constitutes a two level module, and Y is the integer more than or equal to 2；Now, the appearance of a two level module Measure as the capacity sum C2 of Y previous module, the voltage of a two level module for Y previous module average voltage V2, one The internal resistance of two level module be it is measured after overall internal resistance R2 using new measurement result as previous module；
E3：Again, N3 modules, i.e. 3-level module are established in series connection；
Using the capacity of two level module as main fixed reference feature, select Z two level module in step E2 to be connected, connect Battery pack both ends afterwards, which are connected to, to prevent from overcharging, crosses on the protection board put, that is, constitutes a 3-level module, Z be at least above Integer equal to 1；Now, the capacity of a 3-level module is that a two level module of the minimum capacity in Z two level module is held The capacity C 3 of amount, the voltage of a 3-level module is the voltage sum V3 of Z two level module, and the internal resistance of a 3-level module passes through Cross the overall internal resistance R3 using new measurement result as 3-level module after measurement；
E4：Again, N4 modules, i.e. level Four module are established in parallel connection；
Using the new overall internal resistance of 3-level module as main fixed reference feature, M 3-level module in step E3 is selected, by M Individual 3-level module is in parallel, that is, constitutes a level Four module, and M is the integer at least above 2；Now, the appearance of a level Four module Measure as the capacity sum C4 of M 3-level module, the voltage of a level Four module for M 3-level module average voltage V4, one The internal resistance of level Four module be it is measured after overall internal resistance R4 by level Four module of new measurement result；
E5：Circulate above-mentioned steps, when foundation be N odd number modules when, select previous step in -1 grade of module of P N odd number Connected, the battery pack both ends after series connection, which are connected to, to prevent from overcharging, cross on the protection board put, that is, constitutes a N odd mode Block, P are the integer more than or equal to 1；When foundation be N even number modules when, select previous step in -1 grade of module of Q N even number enter Row is in parallel, that is, constitutes a N even number module, and Q is the integer more than or equal to 2；
E6：Using N odd number modules as final block, and power-supply management system is connected, combination finishes.
The method of amount of capacity division is in described step B：If using capacity threshold C valves as a class, carry out progressively Division；
The volumetric(al) standards of cell is：C is nominal, often increases the amount of a threshold values C valve, is set as a new class； Then a level capacity class is：Nominal+C the valves of C, two level capacity class are：Nominal+2C the valves of C, three level capacity class are：Nominal+the 3C of C Valve, four level capacity class are：Nominal+4C the valves of C, five level capacity class are：Nominal+5C the valves of C.
The present invention first connects monomer small-capacity cells, then mode in parallel is combined, or takes string and multistage side Formula is combined（Such as string and mode/string and string mode/string and simultaneously string mode ... of going here and there), every grade of series unit passes through protection board Control overcharges, crosses and put, and takes power-supply management system control in the battery pack afterbody of more than 60V voltages, it is ensured that security.
Brief description of the drawings
Fig. 1 is the battery composite structure schematic diagram of the present invention；
Fig. 2 is in the market conventional batteries combining structure schematic diagram.
Embodiment
As illustrated in fig. 1 and 2, the present invention comprises the following steps：
A：If the volumetric(al) standards of cell is：C is nominal, using the volumetric(al) standards set as boundary, measures cell Capacity C, when the capacity C of cell is nominal less than normal capacity C, it is determined as unqualified battery, abandons；When cell When capacity C is nominal more than or equal to normal capacity C, it is determined as spec battery；
B：The spec battery selected in step A is divided into different capacity class according to amount of capacity, and identified；
The method of amount of capacity division is in described step B：If using capacity threshold C valves as a class, carry out progressively Division；
The volumetric(al) standards of cell is：C is nominal, often increases the amount of a threshold values C valve, is set as a new class； Then a level capacity class is：Nominal+C the valves of C, two level capacity class are：Nominal+2C the valves of C, three level capacity class are：Nominal+the 3C of C Valve, four level capacity class are：Nominal+4C the valves of C, five level capacity class are：Nominal+5C the valves of C.
C：The cell for having divided capacity class in step B is carried out to mend electricity, the magnitude of voltage U for adding to setting is set, and Shelve a period of time；
D：The measurement of voltage and internal resistance is carried out to the cell after being shelved in step C, marks off pressure drop class and internal resistance Class；
D1：Measure voltage and stepping；Voltage measurement is carried out to each cell, and is divided into two class；Draw Minute mark standard is：Set qualified voltage value to close as U, and stepping difference threshold value is U thresholds；
D1-1：When the measurement voltage U of cell, which is surveyed, is less than qualified voltage value U conjunctions, it is determined as unqualified battery, puts Abandon；
D1-2：When the measurement voltage U of cell, which surveys, to be closed in qualified voltage value U between stepping difference threshold value U thresholds, It is determined as voltage order one shelves；And identify；
D1-3：Between magnitude of voltage U of the measurement voltage U surveys of cell in stepping difference threshold value U thresholds and setting is set When, it is determined as secondary voltage shelves；And identify；
D2：Measure internal resistance and stepping；
D2-1：Internal resistance measurement is carried out to the cell that voltage class is divided in step D1-2 and D1-3, sets internal resistance mark Quasi- value is R standards；Internal resistance allowable error value is missed for R；
D2-2：In the range of allowable error R of the internal resistance measurement value R surveys in internal resistance standard value R standards of cell is missed, It is determined as spec battery；
D2-3：Missed when the internal resistance measurement value R of cell surveys the allowable error R in internal resistance standard value R standards outside scope, It is determined as unqualified battery, abandons；
E：Cell after being identified in above-mentioned steps C and step D is carried out after battery pack is first gone here and there and formula combines, combination Standard is：Series connection is using capacity class as main fixed reference feature, using pressure drop class as secondary fixed reference feature；It is in parallel using internal resistance class as Primary Reference feature；
E1：First, N1 modules, i.e. previous module are established in series connection；
Selected from low to high according to capacity class, same pressure drop class is selected according to pressure drop class in the module of same rank Battery, so as to select X cell to be connected, the battery pack both ends after series connection, which are connected to, to prevent from overcharging, crosses the guarantor put On backplate, that is, a previous module is constituted, X is the integer at least above 2；Now, the capacity of a previous module is X single The capacity C 1 of the cell of minimum capacity in body battery, the voltage of a previous module for X cell voltage it And V1, the overall internal resistance R1 after the internal resistance of a previous module is measured using new measurement result as previous module；
E2：Secondly, N2 modules, i.e. two level module are established in parallel connection；
Using the new overall internal resistance of previous module as main fixed reference feature, Y previous module in step E1 is selected, by Y Individual previous module is in parallel, that is, constitutes a two level module, and Y is the integer more than or equal to 2；Now, the appearance of a two level module Measure as the capacity sum C2 of Y previous module, the voltage of a two level module for Y previous module average voltage V2, one The internal resistance of two level module be it is measured after overall internal resistance R2 using new measurement result as previous module；
E3：Again, N3 modules, i.e. 3-level module are established in series connection；
Using the capacity of two level module as main fixed reference feature, select Z two level module in step E2 to be connected, connect Battery pack both ends afterwards, which are connected to, to prevent from overcharging, crosses on the protection board put, that is, constitutes a 3-level module, Z be at least above Integer equal to 1；Now, the capacity of a 3-level module is that a two level module of the minimum capacity in Z two level module is held The capacity C 3 of amount, the voltage of a 3-level module is the voltage sum V3 of Z two level module, and the internal resistance of a 3-level module passes through Cross the overall internal resistance R3 using new measurement result as 3-level module after measurement；
E4：Again, N4 modules, i.e. level Four module are established in parallel connection；
Using the new overall internal resistance of 3-level module as main fixed reference feature, M 3-level module in step E3 is selected, by M Individual 3-level module is in parallel, that is, constitutes a level Four module, and M is the integer at least above 2；Now, the appearance of a level Four module Measure as the capacity sum C4 of M 3-level module, the voltage of a level Four module for M 3-level module average voltage V4, one The internal resistance of level Four module be it is measured after overall internal resistance R4 by level Four module of new measurement result；
E5：Circulate above-mentioned steps, when foundation be N odd number modules when, select previous step in -1 grade of module of P N odd number Connected, the battery pack both ends after series connection, which are connected to, to prevent from overcharging, cross on the protection board put, that is, constitutes a N odd mode Block, P are the integer more than or equal to 1；When foundation be N even number modules when, select previous step in -1 grade of module of Q N even number enter Row is in parallel, that is, constitutes a N even number module, and Q is the integer more than or equal to 2；
E6：Using N odd number modules as final block, and power-supply management system is connected, combination finishes.
Illustrate the manufacture craft of the present invention by way of examples below：
By taking the single type 2AH battery of ternary material 18650 as an example, 0.2C multiplying powers are fully charged to 4.2V, with 0.5C multiplying power dischargings To 3.0V capacity for cell capacity standard C it is nominal, capacity less than mono- battery of 2AH choose without using（It is unqualified）, 2AH Progressively divided with threshold values C valves=class of 50mAh mono- above, divide five class：2.0AH ~ 2.05AH be a level capacity class, 2.05AH ~ 2.1AH is two level capacity class, the level capacity class of 2.1AH1 ~ 2.15AH positions three, 2.15AH--2.2AH positions level Four appearance Amount class, more than 2.2AH are five level capacity class, and class division is completed, and after mark, then with 0.2C multiplying powers benefit electricity to 3.9V. Mend electricity after the completion of shelve one week, if qualified voltage value is U conjunctions=3.8V, voltage less than 3.8V choose without using（It is unqualified）, then will More than 3.8V battery distinguishes two class in V points of threshold value U thresholds=0.05 according to stepping：3.8V ~ 3.85V be a class, 3.85V ~ 3.9V is the second class.Internal resistance standard value is set as R standards=60m Ω, internal resistance is criterion of acceptability less than or equal to 60m Ω, and internal resistance is permitted Perhaps error amount be R mistakes=3m Ω internal resistance difference class in can combo.
Illustrate below cell first go here and there after and combination, by taking batteries of electric automobile group 72V, 200AH as an example, such as Fig. 2 Shown, in the market routine combination, which is, to be a modules A after 100 18650 parallel connections（3.6V、200AH）, then 20 modules As （3.6V200AH）Carry out being connected into battery pack 1 again (72V, 200AH, needs 2000 18650 batteries altogether）.18650 be lithium-ion electric The founder in pond, a kind of lithium ion battery model for standard that Japanese Sony Corporation fixs to save cost then, wherein 18 represent a diameter of 18mm, and 65 represent that length is 65mm, and 0 is expressed as cylindrical battery.18650 common batteries are divided into lithium ion Battery, ferric phosphate lithium cell.Lithium ion battery voltage is 3.6V and 4.2V, and ferric phosphate lithium cell voltage is 3.2V, and capacity is usual For 1200MAH-3000MAH, common capacity is 2200mAh-3600mAh.
As shown in figure 1, the embodiment of the present invention is then first connected using 5 18650, the battery pack both ends after series connection are connected to anti- Only overcharge, cross on the protection board put, the previous module N1 that composition voltage is 18V（18V, 2AH), the capacity of previous module now For the capacity C 1 of the cell of the minimum capacity in 5 cells, voltage is the voltage sum V1 of 5 cells, electric Press as 18V, the overall internal resistance R1 after internal resistance is measured using new measurement result as previous module；The new electricity formed after series connection Pond group, which is all connected to, to be prevented from overcharging, on the protection board that mistake is put, because the protection board for preventing from overcharging, putting excessively only detects and controlled string Join the battery in circuit, it is invalid to the battery pack of parallel connection.Then, then by 100 previous module N1（18V, 2AH) again and it is unified into two Level module N2（18V、200AH）, the capacity of two level module is the capacity sum C2 of 100 previous modules, the voltage of two level module For the average voltage V2 of 100 previous modules, the internal resistance of two level module be it is measured after using new measurement result as one-level mould The overall internal resistance R2 of block.Finally by 4 two level module N2（18V、200AH）Be connected into again battery pack 3-level module N3 (72V, 200AH）, now, 3-level module connects power-supply management system as final block, and combination finishes, and needs 2000 altogether 18650 cells.

Claims (2)

  1. A kind of 1. combined method of combined Li ion cells group, it is characterised in that：Comprise the following steps：
    A：If the volumetric(al) standards of cell is：CNominally, using the volumetric(al) standards set as boundary, the capacity C of cell is measured, When the capacity C of cell is less than normal capacity CNominallyWhen, it is determined as unqualified battery, abandons；When the capacity C of cell is big In or equal to normal capacity CNominallyWhen, it is determined as spec battery；
    B：The spec battery selected in step A is divided into different capacity class according to amount of capacity, and identified；
    C：The cell for having divided capacity class in step B is carried out to mend electricity, adds to the magnitude of voltage of settingU If, and shelve one The section time；
    D：The measurement of voltage and internal resistance is carried out to the cell after being shelved in step C, marks off pressure drop class and internal resistance class；
    D1：Measure voltage and stepping；Voltage measurement is carried out to each cell, and is divided into two class；Division mark Standard is：Set qualified voltage value asU Close, and stepping difference threshold value beU Threshold；
    D1-1：When the measurement voltage of cellU SurveyLess than qualified voltage valueU CloseWhen, it is determined as unqualified battery, abandons；
    D1-2：When the measurement voltage of cellU SurveyIn qualified voltage valueU CloseThreshold value is distinguished with steppingU ThresholdBetween when, be determined as Voltage order one shelves；And identify；
    D1-3：When the measurement voltage of cellU SurveyThreshold value is distinguished in steppingU ThresholdWith the magnitude of voltage of settingU IfBetween when, judge For secondary voltage shelves；And identify；
    D2：Measure internal resistance and stepping；
    D2-1：Internal resistance measurement is carried out to the cell that voltage class is divided in step D1-2 and D1-3, sets internal resistance standard value ForR Standard；Internal resistance allowable error value isR By mistake；
    D2-2：When the internal resistance measurement value of cellR SurveyIn internal resistance standard valueR StandardAllowable errorR By mistakeIn the range of, it is judged to closing Lattice battery；
    D2-3：When the internal resistance measurement value of cellR SurveyIn internal resistance standard valueR StandardAllowable errorR By mistakeOutside scope, it is determined as not Spec battery, abandon；
    E：Cell after being identified in above-mentioned steps C and step D is carried out after battery pack is first gone here and there and formula combines, the standard of combination For：Series connection is using capacity class as main fixed reference feature, using pressure drop class as secondary fixed reference feature；Parallel connection is main using internal resistance class Fixed reference feature；
    E1：First, series connection is establishedN 1Module, i.e. previous module；
    Selected from low to high according to capacity class, select the electricity of same pressure drop class in the module of same rank according to pressure drop class Pond, so as to select X cell to be connected, the battery pack both ends after series connection, which are connected to, to prevent from overcharging, crosses the protection board put On, that is, a previous module is constituted, X is the integer at least above 2；Now, the capacity of a previous module is X monomer electricity The capacity C of the cell of minimum capacity in pond1, the voltage of a previous module is the voltage sum V of X cell1, Overall internal resistance R after the internal resistance of one previous module is measured using new measurement result as previous module1；
    E2：Secondly, parallel connection is establishedN 2Module, i.e. two level module；
    Using the new overall internal resistance of previous module as main fixed reference feature, Y previous module in step E1 is selected, by Y one Level wired in parallel, that is, constitute a two level module, and Y is the integer more than or equal to 2；Now, the capacity of a two level module is Y The capacity sum C of individual previous module2, the voltage of a two level module is the average voltage V of Y previous module2, a two level mould The internal resistance of block be it is measured after overall internal resistance R using new measurement result as previous module2；
    E3：Again, series connection is establishedN 3Module, i.e. 3-level module；
    Using the capacity of two level module as main fixed reference feature, Z two level module in step E2 is selected to be connected, after series connection Battery pack both ends, which are connected to, to prevent from overcharging, crosses on the protection board put, that is, constitutes a 3-level module, and Z is at least above equal to 1 Integer；Now, the capacity of a 3-level module is the appearance of a two level module capacity of the minimum capacity in Z two level module Measure C3, the voltage of a 3-level module is the voltage sum V of Z two level module3, after the internal resistance of a 3-level module is measured Overall internal resistance R using new measurement result as 3-level module3；
    E4：Again, it is in parallel to establishN 4Module, i.e. level Four module；
    Using the new overall internal resistance of 3-level module as main fixed reference feature, M 3-level module in step E3 is selected, by M three Level wired in parallel, that is, constitute a level Four module, and M is the integer at least above 2；Now, the capacity of a level Four module is M The capacity sum C of individual 3-level module4, the voltage of a level Four module is the average voltage V of M 3-level module4, a level Four mould The internal resistance of block be it is measured after overall internal resistance R by level Four module of new measurement result4；
    E5：Above-mentioned steps are circulated, what it is when foundation isN Odd numberDuring module, P are selected in previous stepN Odd number -1Level module is connected, Battery pack both ends after series connection, which are connected to, to prevent from overcharging, crosses on the protection board put, that is, constitutes oneN Odd numberModule, P be more than etc. In 1 integer；What it is when foundation isN Even numberDuring module, Q are selected in previous stepN Even number -1Level module carries out parallel connection, that is, constitutes one It is individualN Even numberModule, Q are the integer more than or equal to 2；
    E6：WillN Odd numberModule connects power-supply management system as final block, and combination finishes.
  2. 2. the combined method of combined Li ion cells group according to claim 1, it is characterised in that：Described step B The method of middle amount of capacity division is：If with capacity threshold CValveFor a class, progressively divided；
    The volumetric(al) standards of cell is：CNominally, often increase a threshold values CValveAmount, be set as a new class；Then one-level is held Measuring class is：CNominally+CValve, two level capacity class are：CNominally+2CValve, three level capacity class are：CNominally+3CValve, four level capacity class are： CNominally+4CValve, five level capacity class are：CNominally+5CValve。
CN201510336067.7A 2015-06-17 2015-06-17 A kind of combined method of combined Li ion cells group Expired - Fee Related CN105186027B (en)

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