CN105710050A - Battery monomer sorting method - Google Patents
Battery monomer sorting method Download PDFInfo
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- CN105710050A CN105710050A CN201610139641.4A CN201610139641A CN105710050A CN 105710050 A CN105710050 A CN 105710050A CN 201610139641 A CN201610139641 A CN 201610139641A CN 105710050 A CN105710050 A CN 105710050A
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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
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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
- B07C5/36—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 battery monomer sorting method. The method comprises the steps that n battery monomers are randomly selected from a to-be-sorted battery monomer set comprising N battery monomers to form a sample set; the open-circuit voltage Ui of each battery monomer in the sample set is collected; the minimum grouping group interval deltaU of the sample set is determined, and deltaU is equal to S/l, wherein S is preset sorting open-circuit voltage allowable deviation, and l is the preset positive integer; the minimum grouping group interval deltaU is used for grouping all group monomers in the sample set; grouped frequencies of all groups are calculated; the sorting open-circuit voltage allowable deviation S serves as the interval, l adjacent groups, with the maximum sum of the grouped frequencies, in the sample set are determined, the maximum upper end voltage of the determined l adjacent groups is determined as the sorting open-circuit voltage upper limit U1, and the minimum lower end voltage of the determined l adjacent groups is determined as the sorting open-circuit voltage lower limit U2; and according to the U1 and the U2, the to-be-sorted battery monomer set collected to be sorted and matched. The method is simple and easy to operate, the production efficiency can be greatly improved, and the production cost is saved.
Description
Technical field
The present invention relates to electric automobile manufacturing technology, particularly to battery cell method for separating.
Background technology
Power battery box, as electric automobile core component, provides power resources for electric automobile.Lithium-ion-power cell monomer as the core part of battery case, generally meets different voltage, power output demand with different series and parallel compound modes.The difference on the technical parameters such as capacity, voltage, internal resistance is there is between electrokinetic cell monomer individuality, if difference is excessive, the distribution of the running voltage of each battery cell/battery modules, operating current is unbalanced, then necessarily cause that set of cells/battery case overcharges/crosses to put, or the problems such as capacity is unsaturated, even cause battery safety in utilization problem.
Accordingly, it would be desirable to select the electrokinetic cell monomer that important technological parameters concordance is higher to form the battery case of electric automobile in battery case production process.The lithium-ion-power cell monomer sorting foundation of combo, method are varied, and dynamic approach includes carrying out sorting combo according to charge-discharge characteristic curve, alternating polarity curve etc.；Static method includes carrying out sorting combo based on parameters such as the open-circuit voltage of battery cell, internal resistance, capacity.But, said method has detection length consuming time, cost defect high, inefficient.
Summary of the invention
An embodiment provides battery cell method for separating, described battery cell method for separating solves conventional batteries monomer method for separating detection length consuming time, cost problem high, inefficient.Further, described battery cell method for separating includes:
Treat that randomly choosing n battery cell sorting battery cell set forms sample set and n < N from what comprise N number of battery cell；
Gather the open-circuit voltage U of each battery cell in described sample seti, wherein i is positive integer, and 1≤i≤n, and determines the battery cell open-circuit voltage maximum U in described sample setmaxWith open-circuit voltage minima Umin；
Determine that the battery cell open-circuit voltage of described sample set is intervalAnd
Determine that the minimum packets group of described sample set is from Δ U, andWherein, S is default sorting open-circuit voltage tolerance, and l is for presetting positive integer；
All battery cells in described sample set being grouped from Δ U with described minimum packets group, number of packet t isRounding up, the packet voltage of jth packet is (Umin+(j-1)×ΔU,Umin+ j × Δ U], and Umin+ j × Δ U is the upper terminal voltage of jth packet, Umin+ (j-1) × Δ U is the lower terminal voltage of jth packet, and wherein, j is positive integer, 1≤j≤l, is U by open-circuit voltageminBattery cell divide the packet to j=1；
Calculate the grouped frequency of each packet, the grouped frequency of jth packetWherein, mjIt is in (U for open-circuit voltage in described sample setmin+(j-1)×ΔU,Umin+ j × Δ U] battery cell quantity in scope；
With described sorting open-circuit voltage tolerance S for interval, it is determined that l the adjacent packets that in described sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of l the adjacent packets gone out is defined as sorting open-circuit voltage upper limit U1, it is to be determined to the minimum lower terminal voltage of l the adjacent packets gone out is defined as sorting open-circuit voltage lower limit U2；
According to described U1And U2Treat that sorting battery cell set carries out sorting combo to described.
Alternatively, in the above-described embodiments, described according to described U1And U2Treat that sorting battery cell set carries out sorting combo to described, specifically include:
Determine that in described sample set, open-circuit voltage is in [U2,U1] the quantity n of battery cell in scope1, and calculate the sorting index η of described sample set, and
If η >=k, described k are default sorting index decision content, the open-circuit voltage of each battery cell treated described in collection in sorting battery cell set except sample set, will treat that in sorting battery cell set, open-circuit voltage is in [U2,U1] battery cell sorting to sorting battery cell set；
If η < k, with 2S for interval, it is determined that 2l the adjacent packets that in described sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of 2l the adjacent packets gone out is designated as U11, it is to be determined to the minimum lower terminal voltage of 2l the adjacent packets gone out is designated as U22；Determine that low open-circuit voltage lower limit is U22, it is determined that the low open-circuit voltage upper limit is U22+ S, it is determined that high open circuit voltage lower limit is U22+ S, it is determined that the high open circuit voltage upper limit is U11, gather the open-circuit voltage of each battery cell treated in sorting battery cell set except sample set, will treat that in sorting battery cell set, open-circuit voltage is in [U22,U22+ S) battery cell sorting to low-voltage sort battery cell set；To treat that in sorting battery cell set, open-circuit voltage is in [U22+S,U11] battery cell sorting to high voltage sort 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 waiting to sort battery cell set, and battery cell each in sample set is grouped, determine l the adjacent packets that grouped frequency sum is maximum with default sorting open-circuit voltage tolerance S for interval, and the maximum upper terminal voltage of l maximum for the grouped frequency sum determined adjacent packets is defined as sorting open-circuit voltage upper limit U1, it is to be determined to the minimum lower terminal voltage of l the adjacent packets that the grouped frequency sum that goes out is maximum is defined as sorting open-circuit voltage lower limit U2, then according to the U determined1And U2Treat sorting battery cell set and carry out sorting combo, the method realizes sorting combo according to the difference of open-circuit voltage between battery cell, simple easily realization, can meet the demand to the aspect such as production time, cost in battery case production process, can reduce again testing cost
Accompanying drawing explanation
The present invention is only schematically illustrated and explains by the following drawings, 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.
Detailed description of the invention
In order to the technical characteristic of invention, purpose and effect are more clearly understood from, now comparison accompanying drawing illustrates the specific embodiment of the present invention, and label identical in the various figures represents identical part.
In this article, " schematically " expression " serves as example, example or explanation ", should will not be construed to a kind of preferred or more advantage technical scheme described herein as any diagram of " schematically ", embodiment.
For making simplified form, each figure only schematically show part related to the present invention, and do not represent its practical structures as product.It addition, so that simplified form readily appreciates, some figure has the parts of identical structure or function, only symbolically depict one of them, or only mark one of them.
In this article, " on ", D score, "front", "rear", "left", "right" etc. only for representing the relative position relation between relevant portion, and the absolute position of these relevant portions non-limiting.
In this article, " first ", " second " etc. are only for differentiation each other, but not represent significance level and order and the premise etc. existed each other.
In this article, the restriction on the mathematics of " equal ", " identical " etc. non-critical and/or geometry meaning, also comprise that it will be appreciated by those skilled in the art that and the permission such as manufacture or use error.Except as otherwise noted, numerical range herein not only includes the gamut in two end points, also includes being contained in some subranges therein.
Fig. 1 is the flow chart of technical solution of the present invention, as it is shown in figure 1, comprise the following steps:
Step 101: treat that randomly choosing n battery cell sorting battery cell set forms sample set from what comprise N number of battery cell.
This step needs meet n < N, 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 cell open-circuit voltage maximum in sample set and open-circuit voltage minima.
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 minima U in sample setminRepresent.
Step 103: determine that the battery cell open-circuit voltage of sample set is interval.
In this step, the battery cell open-circuit voltage of sample set is intervalComputing formula be
Step 104: determine the minimum packets group of sample set from.
In this step, the minimum packets group of the sample set computing formula from Δ U isWherein, S is default sorting open-circuit voltage tolerance, and l is for presetting positive integer, it is preferable that 2≤l≤10.Sample Ji scolds moral minimum packets group from for the battery cell in sample set is grouped, as described below.
Step 105: be grouped to all battery cells in sample set with the minimum packets group determined.
In this step, number of packet t isRounding up, the packet voltage of jth packet is (Umin+(j-1)×ΔU,Umin+ j × Δ U], and Umin+ j × Δ U is the upper terminal voltage of jth packet, Umin+ (j-1) × Δ U is the lower terminal voltage of jth packet, and wherein, j is positive integer, 1≤j≤l, is U by open-circuit voltageminBattery cell divide the packet to j=1；Or, the packet voltage of jth packet is (Umax-j×ΔU,Umax-(j-1) × Δ U], and Umax-(j-1) × Δ U is the upper terminal voltage of jth packet, Umax-j × Δ U is the lower terminal voltage of jth packet, and wherein, j is positive integer, 1≤j≤l, is U by open-circuit voltageminBattery cell divide the packet to j=l.
Two kinds of method for expressing essence of above-mentioned packet voltage are identical, are only adopt different parameters to have different method for expressing.
Step 106: calculate the grouped frequency of each packet.
In this step, the grouped frequency of jth packetWherein, mjIt is in (U for open-circuit voltage in described sample setmin+(j-1)×ΔU,Umin+ j × Δ U] battery cell quantity in scope, or mjIt is in (U for open-circuit voltage in described sample setmax-j×ΔU,Umax-(j-1) × Δ U] battery cell quantity in scope.
Step 107: to sort open-circuit voltage tolerance for interval, it is determined that l the adjacent packets that in sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of l the adjacent packets gone out is defined as sorting open-circuit voltage upper limit U1, it is to be determined to the minimum lower terminal voltage of l the adjacent packets gone out is defined as sorting open-circuit voltage lower limit U2。
Step 108: according to described sorting open-circuit voltage upper limit U1And sorting open-circuit voltage lower limit U2Treat that sorting battery cell set carries out sorting combo to described.
Specifically, this step includes:
Determine that in sample set, open-circuit voltage is in [U2,U1] the quantity n of battery cell in scope1, and calculate the sorting index η of sample set, and
If η >=k, described k are default sorting index decision content, the open-circuit voltage of each battery cell treated described in collection in sorting battery cell set except sample set, will treat that in sorting battery cell set, open-circuit voltage is in [U2,U1] battery cell sorting to sorting battery cell set, afterwards, the battery in sorting battery cell set can be used for same batch of battery case aborning and produce；
If η < k, with 2S for interval, it is determined that 2l the adjacent packets that in described sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of 2l the adjacent packets gone out is designated as U11, it is to be determined to the minimum lower terminal voltage of 2l the adjacent packets gone out is designated as U22；Determine that low open-circuit voltage lower limit is U22, it is determined that the low open-circuit voltage upper limit is U22+ S, it is determined that high open circuit voltage lower limit is U22+ S, it is determined that the high open circuit voltage upper limit is U11, gather the open-circuit voltage of each battery cell treated in sorting battery cell set except sample set, will treat that in sorting battery cell set, open-circuit voltage is in [U22,U22+ S) battery cell sorting to low-voltage sort battery cell set；To treat that in sorting battery cell set, open-circuit voltage is in [U22+S,U11] battery cell sorting to high voltage sort battery cell set.
With embodiment, technical solution of the present invention is further described below.The present embodiment sorts for lithium-ion-power cell monomer, assume to treat that sorting lithium-ion-power cell monomer set comprises N=12000 battery cell, sample size n sample range=240, open-circuit voltage tolerance S=0.012V, l=3, Fig. 2 is the flow chart of the present embodiment, as in figure 2 it is shown, comprise the following steps:
Step 201: treat that randomly choosing 240 battery cells sorting battery cell set forms sample sets from what comprise 12000 battery cells.
Step 202: the open-circuit voltage of each battery cell in collecting sample set, and determine the battery cell open-circuit voltage maximum in sample set and open-circuit voltage minima.
In this step, the open-circuit voltage acquisition method of battery cell is comparatively ripe prior art, does not elaborate at this.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-circuit voltage minima 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 minima Umin=3.740V.
Step 203: determine that the battery cell open-circuit voltage of sample set is interval.
In this step, the battery cell open-circuit voltage of sample set is interval
Step 204: determine the minimum packets group of sample set from.
In this step, the minimum packets group of the sample set computing formula from Δ U isWherein, S is default sorting open-circuit voltage tolerance, and l is for presetting positive integer, and according to the S=0.012V that present embodiment assumes that, l=3, therefore, the minimum packets group of sample set is from Δ U=0.004V.
Step 205: be grouped to all battery cells in sample set with the minimum packets group determined.
In this step, number of packet t isRound up, i.e. t=62, with UminRepresent that the representation being grouped voltage is example, the packet voltage of jth packet is (3.740+ (j-1) × 0.004,3.740+j × 0.004], and the upper terminal voltage that 3.740+j × 0.004 is grouped for jth, the lower terminal voltage that 3.740+ (j-1) × 0.004 is grouped for jth, wherein, j is positive integer, 1≤j≤62, divide the packet to j=1 by the battery cell that open-circuit voltage is 3.740.
Step 206: calculate the grouped frequency of each packet.
In this step, the grouped frequency of jth packetWherein, mjFor open-circuit voltage in sample set be in (3.740+ (j-1) × 0.004,3.740+j × 0.004] battery cell quantity in scope, n=240.Table 1 is part group result, as shown in table 1, in sample set open-circuit voltage be in (3.755,3.758] the battery cell quantity of the 6th of scope packet is 8, corresponding grouped frequency is 3%, and other in like manner no longer describe in detail.
Table 1
| Numbering | Packet 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 for interval, determine 3 adjacent packets that in sample set, grouped frequency sum is maximum, the maximum upper terminal voltage of determine 3 adjacent packets is defined as the sorting open-circuit voltage upper limit, it is to be determined to the minimum lower terminal voltage of 3 adjacent packets gone out is defined as sorting open-circuit voltage lower limit.
Still for table 1, calculate the grouped frequency sum of any 3 adjacent packets successively, such as calculate the 6th packet, the 7th packet, the 8th the grouped frequency sum being grouped are 67%, calculate the 7th packet, the 8th packet, the 9th the grouped frequency sum being grouped are 83%, calculate the 8th packet, the 9th packet, the 10th the grouped frequency sum being grouped are 69%, the calculation of other adjacent packets is identical, will not enumerate.
By calculating, 3 adjacent packets that in sample set, grouped frequency sum is maximum are the 7th packet, the 8th packet, the 9th packet.Wherein, the maximum upper terminal voltage of these 4 adjacent packets is the upper terminal voltage 3.772V of the 9th packet, and minimum 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, sorts open-circuit voltage lower limit U2=3.760V.
Step 208: the quantity of the battery cell in scope of determining that in sample set, open-circuit voltage is in [3.760,3.772], and calculate the sorting index of sample set.
Assume that in the sample set determined in this step, the quantity of the battery cell that open-circuit voltage is in [3.760,3.772] scope is 221, then sorting index η=0.92.
Step 209: judge whether η >=k sets up, if it is, perform step 210, otherwise performs step 211.
Step 210: gather the open-circuit voltage of each battery cell treated in sorting lithium-ion-power cell monomer set except sample set, to treat that in sorting lithium-ion-power cell monomer set, open-circuit voltage is in the battery cell sorting of [3.760,3.772] to sorting battery cell set.
Not yet gathering open-circuit voltage owing to treating in sorting lithium-ion-power cell monomer set that only the battery cell in sample set has gathered open-circuit voltage other battery cells outer, therefore first this step gathers the open-circuit voltage of each battery cell treated in sorting lithium-ion-power cell monomer set except sample set.
Based on the judged result of step 209, η >=k, calculated η=0.92 in step 208, it is assumed that the sorting index decision content k preset is 0.91, then meet η >=k.Illustrate sample set is in [3.760,3.772] battery cell quantity ratio in sample set is beyond the sorting index decision content preset, namely [3.760 can be used, 3.775] as the separation voltage treating sorting lithium-ion-power cell monomer set, then will treat that in sorting lithium-ion-power cell monomer set, open-circuit voltage is in [3.760,3.772] battery cell sorting is to sorting battery cell set, it is achieved treat the sorting combo of sorting lithium-ion-power cell monomer set.
Step 211: with 2S for interval, it is determined that 2l the adjacent packets that in sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of 2l the adjacent packets gone out is designated as U11, it is to be determined to the minimum lower terminal voltage of 2l the adjacent packets gone out is designated as U22。
Based on the judged result of step 209, η < k, calculated η=0.92 in step 208, it is assumed that the sorting index decision content k preset is 0.93, then meet η < k.Illustrate that the battery cell quantity being in [3.760,3.772] in sample set ratio in sample set is not as good as the sorting index decision content preset, and now needs to further determine that the separation voltage treating sorting lithium-ion-power cell monomer set.
In the present embodiment, S=0.012V, then this step determines 6 adjacent packets that in sample set, grouped frequency sum is maximum with 0.024V for interval.Still for table 1, calculate the 6th packet, the 7th packet, the 8th packet, the 9th packet, the 10th packet, the 11st the grouped frequency sum being grouped are 99%, calculate the 7th packet, the 8th packet, the 9th packet, the 10th packet, the 11st packet, the 12nd the grouped frequency sum being grouped are 97%, the calculation of other adjacent packets is identical, will not enumerate.
By calculating, 6 adjacent packets that in sample set, grouped frequency sum is maximum are the 6th packet, the 7th packet, the 8th packet, the 9th packet, the 10th packet, the 11st packet.Wherein, the maximum upper terminal voltage of these 6 adjacent packets is the upper terminal voltage 3.780V of the 11st packet, is designated as U11, minimum lower terminal voltage is the lower terminal voltage 3.756V of the 6th packet, is designated as U22。
Step 212: determine that low open-circuit voltage lower limit is U22, it is determined that the low open-circuit voltage upper limit is U22+ S, it is determined that high open circuit voltage lower limit is U22+ S, it is determined that the high open circuit voltage upper limit is U11, gather the open-circuit voltage of each battery cell treated in sorting battery cell set except sample set, treat the battery cell in sorting lithium-ion-power cell monomer set and carry out sorting combo.
It has been determined that U in step 21111=3.780V, U22=3.756V, and S=0.012V, the voltage range of low-voltage that therefore this step is determined sorting battery cell set for [3.756,3.768), the voltage range of high voltage sorting battery cell set is [3.768,3.770].
Owing to treating that in sorting lithium-ion-power cell monomer set, only the battery cell in sample set has gathered outside open-circuit voltage, other battery cells not yet gather open-circuit voltage, and therefore this step gathers the open-circuit voltage of each battery cell treated in sorting lithium-ion-power cell monomer set except sample set.
The open-circuit voltage of each battery cell in sorting lithium-ion-power cell monomer set is treated according to what gather, [3.756 will be belonged to, 3.768) the battery cell sorting of scope sorts battery cell set to low-voltage, [3.768 will be belonged to, 3.770] the battery cell sorting of scope sorts battery cell set to high voltage, that is, treating that sorting lithium-ion-power cell monomer set sub-elects two groups, the battery cell in each group can be used for same batch of battery case aborning and produce.
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 in conjunction with sampling statistics, reasonable set open-circuit voltage tolerance, avoid employing dynamic sorting method equipment is configured, operation analysis skill set requirements is higher, longer problem consuming time, quickly lithium-ion-power cell monomer can be carried out sorting combo, and can according to the lithium-ion-power cell amount of monomer that need to sort combo, or client particular/special requirement spirit crane adjusts combo strategy, save production cost, improve production efficiency.
It is to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
The a series of detailed description of those listed above is only for illustrating of the feasibility embodiment of the present invention; and and be not used to limit the scope of the invention; all without departing from the spiritual equivalent embodiments made of skill of the present invention or change; such as the combination of feature, segmentation or repetition, should be included within protection scope of the present invention.
Claims (4)
1. a battery cell method for separating, it is characterised in that including:
Treat that randomly choosing n battery cell sorting battery cell set forms sample set and n < N from what comprise N number of battery cell；
Gather the open-circuit voltage U of each battery cell in described sample seti, wherein i is positive integer, and 1≤i≤n, and determines the battery cell open-circuit voltage maximum U in described sample setmaxWith open-circuit voltage minima Umin；
Determine that the battery cell open-circuit voltage of described sample set is intervalAnd
Determine that the minimum packets group of described sample set is from △ U, andWherein, S is default sorting open-circuit voltage tolerance, and l is for presetting positive integer；
All battery cells in described sample set being grouped from △ U with described minimum packets group, number of packet t isRounding up, the packet voltage of jth packet is (Umin+(j-1)×△U,Umin+ j × △ U], and Umin+ j × △ U is the upper terminal voltage of jth packet, Umin+ (j-1) × △ U is the lower terminal voltage of jth packet, and wherein, j is positive integer, 1≤j≤l, is U by open-circuit voltageminBattery cell divide the packet to j=1；
Calculate the grouped frequency of each packet, the grouped frequency of jth packetWherein, mjIt is in (U for open-circuit voltage in described sample setmin+(j-1)×△U,Umin+ j × △ U] battery cell quantity in scope；
With described sorting open-circuit voltage tolerance S for interval, it is determined that l the adjacent packets that in described sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of l the adjacent packets gone out is defined as sorting open-circuit voltage upper limit U1, it is to be determined to the minimum lower terminal voltage of l the adjacent packets gone out is defined as sorting open-circuit voltage lower limit U2；
According to described U1And U2Treat that sorting battery cell set carries out sorting combo to described.
2. method according to claim 1, it is characterised in that described according to described U1And U2Treat that sorting battery cell set carries out sorting combo to described, specifically include:
Determine that in described sample set, open-circuit voltage is in [U2,U1] the quantity n of battery cell in scope1, and calculate the sorting index η of described sample set, and
If η >=k, described k are default sorting index decision content, the open-circuit voltage of each battery cell treated described in collection in sorting battery cell set except sample set, will treat that in sorting battery cell set, open-circuit voltage is in [U2,U1] battery cell sorting to sorting battery cell set；
If η < k, with 2S for interval, it is determined that 2l the adjacent packets that in described sample set, grouped frequency sum is maximum, it is to be determined to the maximum upper terminal voltage of 2l the adjacent packets gone out is designated as U11, it is to be determined to the minimum lower terminal voltage of 2l the adjacent packets gone out is designated as U22；Determine that low open-circuit voltage lower limit is U22, it is determined that the low open-circuit voltage upper limit is U22+ S, it is determined that high open circuit voltage lower limit is U22+ S, it is determined that the high open circuit voltage upper limit is U11, gather the open-circuit voltage of each battery cell treated in sorting battery cell set except sample set, will treat that in sorting battery cell set, open-circuit voltage is in [U22,U22+ S) battery cell sorting to low-voltage sort battery cell set；To treat that in sorting battery cell set, open-circuit voltage is in [U22+S,U11] battery cell sorting to high voltage sort battery cell set.
3. method according to claim 1, it is characterised in that preferably, (N × 2%)≤n≤(N × 5%).
4. method according to claim 1, it is characterised in that preferably, 2≤l≤10.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106556802A (en) * | 2016-11-01 | 2017-04-05 | 东软集团股份有限公司 | A kind of accumulator battery exception cell recognition methodss and device |
| CN106623008A (en) * | 2016-11-17 | 2017-05-10 | 江苏索尔新能源科技股份有限公司 | Intelligent foreseeing and sorting method for battery cells |
| CN108896921A (en) * | 2018-06-19 | 2018-11-27 | 合肥国轩高科动力能源有限公司 | Method for screening consistency of lithium ion batteries |
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