CN105710050B - Battery cell method for separating - Google Patents

Battery cell method for separating Download PDF

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Publication number
CN105710050B
CN105710050B CN201610139641.4A CN201610139641A CN105710050B CN 105710050 B CN105710050 B CN 105710050B CN 201610139641 A CN201610139641 A CN 201610139641A CN 105710050 B CN105710050 B CN 105710050B
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battery cell
open
circuit voltage
sample set
packet
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CN105710050A (en
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王克坚
曹瑜琦
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EVENT TECHNOLOGY Co Ltd
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EVENT TECHNOLOGY Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B07C5/38—Collecting or arranging articles in groups

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Abstract

The invention discloses a kind of battery cell method for separating, including：N battery cell composition sample set is randomly choosed from the battery cell set to be sorted comprising N number of battery cell；The open-circuit voltage U of each battery cell in collecting sample seti；The minimum packets group of sample set is determined away from Δ U, andWherein, S is default sorting open-circuit voltage tolerance, and l is default positive integer；All battery cells in sample set are grouped away from Δ U with minimum packets group；Calculate the grouped frequency of each packet；To sort open-circuit voltage tolerance S as section, the l adjacent packets that grouped frequency sum is maximum in sample set are determined, terminal voltage in the maximum for the l adjacent packets determined is defined as to sort open-circuit voltage upper limit U1, terminal voltage under the minimum for the l adjacent packets determined is defined as to sort open-circuit voltage lower limit U2；According to U1And U2Treat sorting battery cell set and carry out sorting combo.The present invention is simple to operation, can greatly improve production efficiency, save production cost.

Description

Battery cell method for separating
Technical field
The present invention relates to electric automobile manufacturing technology, more particularly to battery cell method for separating.
Background technology
Power battery box provides power resources as electric automobile core component for electric automobile.Lithium-ion-power cell Core part of the monomer as battery case, different voltage, power output are generally met with different series and parallel combination Demand.The difference on the technical parameters such as capacity, voltage, internal resistance, if difference is excessive, each electricity between electrokinetic cell monomer individual be present The operating voltage of pond monomer/battery modules, operating current distribution are unbalanced, then necessarily cause battery pack/battery case to overcharge/mistake Put, or the problems such as capacity unsaturation, or even cause battery sex chromosome mosaicism safe to use.
Therefore, it is necessary to select the higher electrokinetic cell monomer group of important technological parameters uniformity in battery case production process Into the battery case of electric automobile.Foundation, the method for lithium-ion-power cell monomer sorting combo are varied, and dynamic approach includes Sorting combo is carried out according to charge-discharge characteristic curve, alternating polarity curve etc.；Static method includes the open circuit based on battery cell The parameters such as voltage, internal resistance, capacity carry out sorting combo.However, the above method has detection, time-consuming, cost is high, efficiency is low Defect.
The content of the invention
An embodiment provides battery cell method for separating, the battery cell method for separating solves biography Battery cell method for separating of uniting detects the problem of time-consuming, cost is high, efficiency is low.Also, the battery cell method for separating bag Include：
N battery cell composition sample set is randomly choosed from the battery cell set to be sorted comprising N number of battery cell Close, and n ＜ N；
Gather the open-circuit voltage U of each battery cell in the sample seti, wherein i is positive integer, and 1≤i≤n, and Determine the battery cell open-circuit voltage maximum U in the sample setmaxWith open-circuit voltage minimum value Umin；
Determine the battery cell open-circuit voltage section of the sample setAnd
The minimum packets group of the sample set is determined away from Δ U, andWherein, S is default sorting open circuit electricity Tolerance is pressed, l is default positive integer；
All battery cells in the sample set are grouped away from Δ U with the minimum packets group, number of packet t ForRound up, the packet voltage of j-th of packet is (Umin+(j-1)×ΔU,Umin+ j × Δ U], and Umin+j×ΔU For the upper terminal voltage of j-th of packet, Umin+ (j-1) × Δ U is the lower terminal voltage of j-th of packet, wherein, j is positive integer, 1≤j ≤ t, it is U by open-circuit voltageminBattery cell point to j=1 packet；
Calculate the grouped frequency of each packet, the grouped frequency of j-th of packetWherein, mjFor the sample set Open-circuit voltage is in (U in conjunctionmin+(j-1)×ΔU,Umin+ j × Δ U] in the range of battery cell quantity；
Using the sorting open-circuit voltage tolerance S as section, determine that grouped frequency sum is maximum in the sample set L adjacent packets, terminal voltage in the maximum for the l adjacent packets determined is defined as to sort open-circuit voltage upper limit U1, will Terminal voltage is defined as sorting open-circuit voltage lower limit U under the minimum for the l adjacent packets determined2；
According to the U1And U2Sorting combo is carried out to the battery cell set to be sorted.
Alternatively, in the above-described embodiments, it is described according to the U1And U2The battery cell set to be sorted is carried out Combo is sorted, is specifically included：
Determine that open-circuit voltage is in [U in the sample set2,U1] in the range of battery cell quantity n1, and calculate institute The sorting index η of sample set is stated, and
If η >=k, the k is default sorting index decision content, and sample is removed in battery cell set to be sorted described in collection The open-circuit voltage of each battery cell outside set, open-circuit voltage in battery cell set to be sorted is in [U2,U1] battery Monomer is sorted to sorting battery cell set；
If η ＜ k, using 2S as section, the 2l adjacent packets that grouped frequency sum is maximum in the sample set are determined, Terminal voltage in the maximum for the 2l adjacent packets determined is designated as U11, by the minimum lower end electricity for the 2l adjacent packets determined Pressure is designated as U22；It is U to determine low open-circuit voltage lower limit22, it is U to determine the low open-circuit voltage upper limit22+ S, determine high open circuit voltage lower limit For U22+ S, it is U to determine the high open circuit voltage upper limit11, gather each battery in addition to sample set in battery cell set to be sorted The open-circuit voltage of monomer, open-circuit voltage in battery cell set to be sorted is in [U22,U22+ S) battery cell sort to low Voltage sorts battery cell set；[U will be in by open-circuit voltage in battery cell set to be sorted22+S,U11] battery cell point Choosing to high voltage sorts battery cell set.
Alternatively, in the above-described embodiments, (N × 2%)≤n≤(N × 5%).
Alternatively, in the above-described embodiments, 2≤l≤10.
According to above-mentioned each embodiment, sample set is randomly choosed from battery cell set to be sorted, and to sample set Each battery cell is grouped in conjunction, and grouped frequency sum is determined most as section using default sorting open-circuit voltage tolerance S L big adjacent packets, and terminal voltage in the maximum of l maximum adjacent packets of the grouped frequency sum determined is defined as Sort open-circuit voltage upper limit U1, terminal voltage under the minimum of l maximum adjacent packets of the grouped frequency sum determined is determined To sort open-circuit voltage lower limit U2, then according to the U determined1And U2Treat sorting battery cell set and carry out sorting combo, should Method realizes sorting combo according to the difference of open-circuit voltage between battery cell, simple easily to realize, can meet that battery case produces During testing cost is reduced to the demand of production time, cost etc., and can
Brief description of the drawings
The following drawings only does schematic illustration and explanation to the present invention, not delimit the scope of the invention.
Fig. 1 is the flow chart of technical solution of the present invention；
Fig. 2 is the flow chart of the embodiment of the present invention.
Embodiment
In order to which the technical characteristic of invention, purpose and effect are more clearly understood, now control brief description of the drawings is of the invention Embodiment, in the various figures identical label represent identical part.
Herein, " schematic " expression " serving as example, example or explanation ", will should not be described herein as " showing Any diagram, the embodiment of meaning property " are construed to a kind of preferred or more advantageous technical scheme.
To make simplified form, part related to the present invention is only schematically show in each figure, and do not represent it Practical structures as product.In addition, so that simplified form readily appreciates, there is the portion of identical structure or function in some figures Part, one of those is only symbolically depicted, or only marked one of those.
Herein, " on ", " under ", "front", "rear", "left", "right" etc. are only used for representing relative between relevant portion Position relationship, and the absolute position of these non-limiting relevant portions.
Herein, " first ", " second " etc. are only used for mutual differentiation, rather than represent significance level and order and Existing premise etc. each other.
Herein, the limitation in " equal ", " identical " etc. and non-critical mathematics and/or geometry meaning, is also included It will be appreciated by those skilled in the art that and manufacture or the error for the permission such as using.Unless otherwise indicated, numerical value model herein The gamut not only included in two end points is enclosed, also includes being contained in some subranges therein.
Fig. 1 is the flow chart of technical solution of the present invention, as shown in figure 1, comprising the following steps：
Step 101：N battery cell group is randomly choosed from the battery cell set to be sorted comprising N number of battery cell Into sample set.
Need to meet n ＜ N in this step, it is preferable that (N × 2%)≤n≤(N × 5%).
Step 102：The open-circuit voltage of each battery cell in collecting sample set, and determine the battery list in sample set Body open-circuit voltage maximum and open-circuit voltage minimum value.
In this step, the open-circuit voltage U of each battery cell in sample setiRepresenting, wherein i is positive integer, and 1≤ i≤n.Battery cell open-circuit voltage maximum U in sample setmaxRepresent, the battery cell open-circuit voltage in sample set Minimum value UminRepresent.
Step 103：Determine the battery cell open-circuit voltage section of sample set.
In this step, the battery cell open-circuit voltage section of sample setCalculation formula be
Step 104：Determine the minimum packets group of sample set away from.
In this step, calculation formula of the minimum packets group of sample set away from Δ U isWherein, S is default Open-circuit voltage tolerance is sorted, l is default positive integer, it is preferable that 2≤l≤10.Sample Ji scold moral minimum packets group away from for Battery cell in sample set is grouped, it is as described below.
Step 105：With the minimum packets group determined away from being grouped to all battery cells in sample set.
In this step, number of packet t isRound up, the packet voltage of j-th of packet is (Umin+(j-1)×Δ U,Umin+ j × Δ U], and Umin+ j × Δ U be j-th packet upper terminal voltage, Umin+ (j-1) × Δ U is under j-th of packet Terminal voltage, wherein, j is positive integer, 1≤j≤l, is U by open-circuit voltageminBattery cell point to j=1 packet；Or the The packet voltage of j packet is (Umax-j×ΔU,Umax- (j-1) × Δ U], and Umax- (j-1) × Δ U is j-th of packet Upper terminal voltage, Umax- j × Δ U is the lower terminal voltage of j-th of packet, wherein, j is positive integer, 1≤j≤t, is by open-circuit voltage UminBattery cell point to j=l packet.
Two kinds of method for expressing essence of above-mentioned packet voltage are identical, are only to have different expression sides using different parameters Method.
Step 106：Calculate the grouped frequency of each packet.
In this step, the grouped frequency of j-th of packetWherein, mjAt open-circuit voltage in the sample set In (Umin+(j-1)×ΔU,Umin+ j × Δ U] in the range of battery cell quantity, or mjTo be opened a way in the sample set Voltage is in (Umax-j×ΔU,Umax- (j-1) × Δ U] in the range of battery cell quantity.
Step 107：To sort open-circuit voltage tolerance as section, grouped frequency sum maximum in sample set is determined L adjacent packets, terminal voltage in the maximum for the l adjacent packets determined is defined as to sort open-circuit voltage upper limit U1, will be true Terminal voltage is defined as sorting open-circuit voltage lower limit U under the minimum for the l adjacent packets made2。
Step 108：According to the sorting open-circuit voltage upper limit U1And sorting open-circuit voltage lower limit U2Sorting electricity is treated to described Pond monomer set carries out sorting combo.
Specifically, this step includes：
Determine that open-circuit voltage is in [U in sample set2,U1] in the range of battery cell quantity n1, and calculate sample set The sorting index η of conjunction, and
If η >=k, the k is default sorting index decision content, and sample is removed in battery cell set to be sorted described in collection The open-circuit voltage of each battery cell outside set, open-circuit voltage in battery cell set to be sorted is in [U2,U1] battery Monomer is sorted to sorting battery cell set, and afterwards, the battery in sorting battery cell set can be used for same in production Batch battery case produces；
If η ＜ k, using 2S as section, the 2l adjacent packets that grouped frequency sum is maximum in the sample set are determined, Terminal voltage in the maximum for the 2l adjacent packets determined is designated as U11, by the minimum lower end electricity for the 2l adjacent packets determined Pressure is designated as U22；It is U to determine low open-circuit voltage lower limit22, it is U to determine the low open-circuit voltage upper limit22+ S, determine high open circuit voltage lower limit For U22+ S, it is U to determine the high open circuit voltage upper limit11, gather each battery in addition to sample set in battery cell set to be sorted The open-circuit voltage of monomer, open-circuit voltage in battery cell set to be sorted is in [U22,U22+ S) battery cell sort to low Voltage sorts battery cell set；[U will be in by open-circuit voltage in battery cell set to be sorted22+S,U11] battery cell point Choosing to high voltage sorts battery cell set.
Technical solution of the present invention is further described with embodiment below.The present embodiment is with lithium-ion-power cell list Exemplified by body sorting, it is assumed that lithium-ion-power cell monomer set to be sorted includes N=12000 battery cell, sample size n sample range= 240, open-circuit voltage tolerance S=0.012V, l=3, Fig. 2 are the flow chart of the present embodiment, as shown in Fig. 2 including following step Suddenly：
Step 201：240 batteries are randomly choosed from the battery cell set to be sorted comprising 12000 battery cells Monomer composition sample set.
Step 202：The open-circuit voltage of each battery cell in collecting sample set, and determine the battery list in sample set Body open-circuit voltage maximum and open-circuit voltage minimum value.
In this step, the open-circuit voltage acquisition method of battery cell is more ripe prior art, is not made herein in detail Explanation.In collecting sample set after the open-circuit voltage of all battery cells, it is determined that the open-circuit voltage maximum U collectedmaxWith open Road voltage minimum Umin, it is assumed that the battery cell open-circuit voltage maximum U in the sample set that this step is determinedmax= 3.987V, open-circuit voltage minimum value Umin=3.740V.
Step 203：Determine the battery cell open-circuit voltage section of sample set.
In this step, the battery cell open-circuit voltage section of sample set
Step 204：Determine the minimum packets group of sample set away from.
In this step, calculation formula of the minimum packets group of sample set away from Δ U isWherein, S is default Sort open-circuit voltage tolerance, l is default positive integer, according to present embodiment assumes that S=0.012V, l=3, therefore, sample The minimum packets group of set is away from Δ U=0.004V.
Step 205：With the minimum packets group determined away from being grouped to all battery cells in sample set.
In this step, number of packet t isRound up, i.e. t=62, with UminRepresent packet Exemplified by the representation of voltage, j-th packet packet voltage for (3.740+ (j-1) × 0.004,3.740+j × 0.004], And 3.740+j × 0.004 is the upper terminal voltage of j-th of packet, 3.740+ (j-1) × 0.004 is the lower end electricity of j-th of packet Pressure, wherein, j is positive integer, 1≤j≤62, the battery cell that open-circuit voltage is 3.740 is divided to j=1 packet.
Step 206：Calculate the grouped frequency of each packet.
In this step, the grouped frequency of j-th of packetWherein, mjIt is in for open-circuit voltage in sample set (3.740+ (j-1) × 0.004,3.740+j × 0.004] in the range of battery cell quantity, n=240.Table 1 is grouped for part As a result, as shown in table 1, in sample set open-circuit voltage be in (3.755,3.758] the battery cell number of the 6th of scope packet Measure as 8, corresponding grouped frequency is 3%, and other are similarly no longer described in detail.
Table 1
Numbering It is grouped voltage Distributed quantity Grouped frequency
6 3.756 ＜ U≤3.760 8 3%
7 3.760 ＜ U≤3.764 56 23%
8 3.764 ＜ U≤3.768 98 41%
9 3.768 ＜ U≤3.772 45 19%
10 3.772 ＜ U≤3.776 22 9%
11 3.776 ＜ U≤3.780 10 4%
12 3.780 ＜ U≤3.784 2 1%
Step 207：To sort open-circuit voltage tolerance 0.012V as section, grouped frequency sum in sample set is determined 3 maximum adjacent packets, terminal voltage in the maximum of determine 3 adjacent packets is defined as to sort the open-circuit voltage upper limit, Terminal voltage under the minimum of determine 3 adjacent packets is defined as to sort open-circuit voltage lower limit.
Still by taking table 1 as an example, calculate the grouped frequency sum of any 3 adjacent packets successively, for example, calculate the 6th packet, 7th packet, the 8th grouped frequency sum being grouped are 67%, calculate the 7th packet, the 8th packet, the 9th point being grouped Class frequency sum is 83%, and the 8th packet of calculating, the 9th packet, the grouped frequency sum of the 10th packet are 69%, other The calculation of adjacent packets is identical, will not enumerate.
By being calculated, in sample set 3 maximum adjacent packets of grouped frequency sum be the 7th packet, the 8th Packet, the 9th packet.Wherein, terminal voltage is the upper terminal voltage 3.772V of the 9th packet in the maximum of this 4 adjacent packets, most Small lower terminal voltage is the lower terminal voltage 3.760V of the 7th packet, thereby determines that out sorting open-circuit voltage upper limit U1=3.772V, point Select open-circuit voltage lower limit U2=3.760V.
Step 208：Determine the number of the battery cell that open-circuit voltage is in the range of [3.760,3.772] in sample set Amount, and calculate the sorting index of sample set.
Assuming that the battery list that open-circuit voltage is in the range of [3.760,3.772] in the sample set determined in this step The quantity of body is 221, then sorting index η=0.92.
Step 209：Judge whether η >=k sets up, if it is, performing step 210, otherwise perform step 211.
Step 210：Gather each battery cell in addition to sample set in lithium-ion-power cell monomer set to be sorted Open-circuit voltage, open-circuit voltage in lithium-ion-power cell monomer set to be sorted is in the battery list of [3.760,3.772] Body sorting extremely sorts battery cell set.
Because the battery cell in lithium-ion-power cell monomer set to be sorted only in sample set has gathered open circuit electricity Other outer battery cells of pressure not yet gather open-circuit voltage, therefore this step gathers lithium-ion-power cell monomer collection to be sorted first The open-circuit voltage of each battery cell in conjunction in addition to sample set.
Judged result based on step 209, η >=k, η=0.92 being calculated in step 208, it is assumed that default sorting Rate decision content k is 0.91, then meets η >=k.Illustrate that the battery cell quantity in [3.760,3.772] is in sample in sample set Ratio in this set exceeds default sorting index decision content, you can be moved with [3.760,3.775] as lithium ion to be sorted The separation voltage of power battery cell set, then open-circuit voltage it will be in lithium-ion-power cell monomer set to be sorted The battery cell of [3.760,3.772] is sorted to sorting battery cell set, and sorting lithium-ion-power cell monomer is treated in realization The sorting combo of set.
Step 211：Using 2S as section, the 2l adjacent packets that grouped frequency sum is maximum in sample set are determined, will be true Terminal voltage is designated as U in the maximum for the 2l adjacent packets made11, terminal voltage under the minimum for the 2l adjacent packets determined is remembered For U22。
Judged result based on step 209, η ＜ k, η=0.92 being calculated in step 208, it is assumed that default sorting Rate decision content k is 0.93, then meets η ＜ k.Illustrate that the battery cell quantity in [3.760,3.772] is in sample in sample set Ratio in this set now needs to further determine that lithium-ion-power cell list to be sorted not as good as default sorting index decision content The separation voltage of body set.
In the present embodiment, S=0.012V, then this step determine grouped frequency sum in sample set by section of 0.024V 6 maximum adjacent packets.Still by taking table 1 as an example, the 6th packet, the 7th packet, the 8th packet, the 9th packet, the are calculated 10 packets, the grouped frequency sum of the 11st packet are 99%, calculate the 7th packet, the 8th packet, the 9th packet, the 10 packets, the 11st packet, the grouped frequency sum of the 12nd packet are 97%, the calculation phase of other adjacent packets Together, will not enumerate.
By being calculated, in sample set 6 maximum adjacent packets of grouped frequency sum be the 6th packet, the 7th Packet, the 8th packet, the 9th packet, the 10th packet, the 11st packet.Wherein, the maximum upper end electricity of this 6 adjacent packets The upper terminal voltage 3.780V for the 11st packet is pressed, is designated as U11, the lower terminal voltage of minimum is the lower terminal voltage of the 6th packet 3.756V it is designated as U22。
Step 212：It is U to determine low open-circuit voltage lower limit22, it is U to determine the low open-circuit voltage upper limit22+ S, it is determined that high open circuit electricity Pressure is limited to U22+ S, it is U to determine the high open circuit voltage upper limit11, gather every in addition to sample set in battery cell set to be sorted The open-circuit voltage of individual battery cell, the battery cell treated in sorting lithium-ion-power cell monomer set carry out sorting combo.
It has been determined that U in step 21111=3.780V, U22=3.756V, and S=0.012V, therefore the determination of this step Low-voltage sorting battery cell set voltage range for [3.756,3.768), high voltage sort battery cell set voltage Scope is [3.768,3.770].
Because the battery cell in lithium-ion-power cell monomer set to be sorted only in sample set has gathered open circuit electricity Pressure is outer, and other battery cells not yet gather open-circuit voltage, therefore this step gathers lithium-ion-power cell monomer set to be sorted In each battery cell in addition to sample set open-circuit voltage.
According to the open-circuit voltage of each battery cell in the lithium-ion-power cell monomer set to be sorted of collection, will belong to [3.756,3.768) battery cell of scope sorts to low-voltage and sorts battery cell set, [3.768,3.770] model will be belonged to The battery cell enclosed sorts to high voltage and sorts battery cell set, i.e. by lithium-ion-power cell monomer set to be sorted point Select two groups, the battery cell in each group can be used for same batch battery case production in production.
The battery cell method for separating that above-described embodiment provides, by detecting lithium-ion-power cell monomer open-circuit voltage, Battery cell Voltage Distribution is analyzed with reference to sampling statistics, reasonable set open-circuit voltage tolerance, is avoided using dynamic Method for separating is to device configuration, Operations Analyst skill set requirements are higher, take the problem of longer, can be quickly to lithium ion power electricity Pond monomer carries out sorting combo, and can according to the lithium-ion-power cell amount of monomer that need to sort combo, or client is special will Ask clever crane adjustment to match somebody with somebody group policy, save production cost, improve production efficiency.
It should be appreciated that although this specification is described according to each embodiment, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity Using specification as an entirety, the technical scheme in each embodiment may also be suitably combined to form people in the art The other embodiment that member is appreciated that.
Those listed above is a series of to be described in detail only for feasibility embodiment of the invention specifically It is bright, and and be not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or Change, such as the combination, segmentation or repetition of feature, should be included in the scope of the protection.

Claims (4)

  1. A kind of 1. battery cell method for separating, it is characterised in that including：
    N battery cell composition sample set is randomly choosed from the battery cell set to be sorted comprising N number of battery cell, and N ＜ N；
    Gather the open-circuit voltage U of each battery cell in the sample seti, wherein i is positive integer, and 1≤i≤n, and is determined Battery cell open-circuit voltage maximum U in the sample setmaxWith open-circuit voltage minimum value Umin；
    Determine the battery cell open-circuit voltage section of the sample setAnd
    The minimum packets group of the sample set is determined away from Δ U, andWherein, S allows for default sorting open-circuit voltage Deviation, l are default positive integer；
    All battery cells in the sample set are grouped away from Δ U with the minimum packets group, number of packet t isRound up, the packet voltage of j-th of packet is (Umin+(j-1)×ΔU,Umin+ j × Δ U], and Umin+ j × Δ U is The upper terminal voltage of j-th of packet, Umin+ (j-1) × Δ U is the lower terminal voltage of j-th of packet, wherein, j is positive integer, 1≤j≤ T, it is U by open-circuit voltageminBattery cell point to j=1 packet；
    Calculate the grouped frequency of each packet, the grouped frequency of j-th of packetWherein, mjFor in the sample set Open-circuit voltage is in (Umin+(j-1)×ΔU,Umin+ j × Δ U] in the range of battery cell quantity；
    Using the sorting open-circuit voltage tolerance S as section, determine that the l that grouped frequency sum is maximum in the sample set is individual Adjacent packets, terminal voltage in the maximum for the l adjacent packets determined is defined as to sort open-circuit voltage upper limit U1, will determine L adjacent packets minimum under terminal voltage be defined as sorting open-circuit voltage lower limit U2；
    According to the U1And U2Sorting combo is carried out to the battery cell set to be sorted.
  2. 2. according to the method for claim 1, it is characterised in that described according to the U1And U2To the battery to be sorted Monomer set carries out sorting combo, specifically includes：
    Determine that open-circuit voltage is in [U in the sample set2,U1] in the range of battery cell quantity n1, and calculate the sample The sorting index η of this set, and
    If η >=k, the k is default sorting index decision content, and sample set is removed in battery cell set to be sorted described in collection The open-circuit voltage of outer each battery cell, open-circuit voltage in battery cell set to be sorted is in [U2,U1] battery cell Sorting extremely sorting battery cell set；
    If η ＜ k, using 2S as section, the 2l adjacent packets that grouped frequency sum is maximum in the sample set are determined, will be true Terminal voltage is designated as U in the maximum for the 2l adjacent packets made11, terminal voltage under the minimum for the 2l adjacent packets determined is remembered For U22；It is U to determine low open-circuit voltage lower limit22, it is U to determine the low open-circuit voltage upper limit22+ S, it is U to determine high open circuit voltage lower limit22+ S, it is U to determine the high open circuit voltage upper limit11, gather each battery cell in battery cell set to be sorted in addition to sample set Open-circuit voltage, open-circuit voltage in battery cell set to be sorted is in [U22,U22+ S) battery cell sort to low-voltage point Select battery cell set；[U will be in by open-circuit voltage in battery cell set to be sorted22+S,U11] battery cell sorting it is paramount Voltage sorts battery cell set.
  3. 3. according to the method for claim 1, it is characterised in that preferably, (N × 2%)≤n≤(N × 5%).
  4. 4. according to the method for claim 1, it is characterised in that preferably, 2≤l≤10.
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