CN114405843B - Method for selecting abnormal lithium ion battery in capacity-dividing process - Google Patents
Method for selecting abnormal lithium ion battery in capacity-dividing process Download PDFInfo
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- CN114405843B CN114405843B CN202111554883.7A CN202111554883A CN114405843B CN 114405843 B CN114405843 B CN 114405843B CN 202111554883 A CN202111554883 A CN 202111554883A CN 114405843 B CN114405843 B CN 114405843B
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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
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
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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
- B07C5/361—Processing or control devices therefor, e.g. escort memory
- B07C5/362—Separating or distributor mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
Abstract
The invention discloses a method for selecting abnormal lithium ion batteries in a capacity-dividing process, which comprises the following steps: s1, battery upper cabinet: placing the formed battery at each point in the separate container after placing the formed battery; s2, sticking a bar code: pasting a bar code on a shell outside the battery, and acquiring data in the bar code of the battery by using a bar code gun; s3, capacity division: performing capacity division on the battery according to a set capacity division flow; s4, data export: after the capacity division is finished, each item of data of the battery in the capacity division process is exported; s5, setting standard parameters of judgment data: setting and judging data standard parameters according to the requirements of various data; s6, data comparison: comparing the data derived in the step S4 with the standard parameters of the judgment data set in the step S5; s7, selecting a battery: the qualified battery enters the next working procedure, and the unqualified battery is placed; s8, performing capacity division on the unqualified battery again; the invention can rapidly find out the battery with abnormal data in the capacity division process, and has accurate data judgment and rapid selection.
Description
Technical Field
The invention belongs to the technical field of new energy batteries, and particularly relates to a method for selecting abnormal lithium ion batteries in a capacity-dividing process.
Background
In recent years, as petroleum resources are gradually deficient and environmental pollution is increasingly serious, development of new energy sources to replace traditional petrochemical energy sources is urgent, and in this background, development of lithium ion batteries without environmental pollution is particularly important.
The lithium ion battery industry has been rapidly developed in recent years under the strong support of the state, and although the lithium ion battery manufacturing steps are slightly different, the lithium ion battery manufacturing steps are generally consistent and all comprise: stirring, coating, rolling, tabletting, core forming, welding, drying, liquid injection, standing, formation charging, sealing, formation discharging, battery aging, OCV testing, capacity separation, sorting and shipment.
In the capacity division process, the problem of poor contact of the capacity division cabinet or abnormal point positions of the cabinet can cause battery data errors, and the trouble is added to the subsequent battery assembling process to cause assembling errors; in addition, there is a possibility that the battery itself is problematic in that the problematic battery is mixed into the assembled battery, which may affect the overall performance of the battery, thereby reducing the use effect.
Problems that may generally exist are: abnormal charge and discharge current, abnormal charge constant current ratio, abnormal capacity and abnormal voltage; such problems are not advisable to check one by staff, both wasteful of manpower and extremely prone to error.
Disclosure of Invention
The invention aims to provide a method for selecting abnormal lithium ion batteries in the capacity-dividing process, which can effectively select bad batteries in the capacity-dividing process of the lithium ion batteries.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for selecting abnormal lithium ion batteries in a capacity-dividing process comprises the following steps:
s1, battery upper cabinet: placing the formed batteries for 16-24 h in an environment with the temperature of 25+/-2 ℃, and placing the batteries at each point in the separate container after the placement is finished;
s2, sticking a bar code: pasting bar codes on a shell outside the battery, and scanning the bar codes of each battery by using a bar code gun to obtain data in the bar codes of the battery;
s3, capacity division: performing capacity division on the battery according to a set capacity division flow;
s4, data export: after the capacity division is finished, each item of data of the battery in the capacity division process is exported;
s5, setting standard parameters of judgment data: setting and judging data standard parameters according to the requirements of various data;
s6, data comparison: comparing the data derived in the step S4 with the standard parameters of the judgment data set in the step S5;
s7, selecting a battery: the qualified battery enters the next working procedure, the unqualified battery is taken down on the separating cabinet, and the unqualified battery is marked for classification and placement;
and S8, performing the capacity-dividing process on the unqualified battery again.
The following is a further optimization of the above technical solution according to the present invention:
further optimizing: in step S3, the capacity-dividing flow is performed as follows:
the first step: placing the battery on a separate cabinet and placing for 2min;
and a second step of: charging with 0.5C constant current and constant voltage, limiting the current to 0.02C, and keeping the time to 180min, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the nickel cobalt lithium manganate battery is 4.15V;
and a third step of: the battery is kept on the separate cabinet for 5min;
fourth step: discharging with constant current of 0.5C for 180min; the voltage limiting of the lithium iron phosphate battery is 2.5V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 3.0V;
fifth step: the battery is kept on the separate cabinet for 5min;
sixth step: charging with 0.5C constant current and constant voltage, limiting the current to 0.02C, and keeping the time to 180min, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the nickel cobalt lithium manganate battery is 4.15V;
seventh step: the battery is kept on the separate cabinet for 5min;
eighth step: discharging with constant current of 0.5C for 180min; the voltage limiting of the lithium iron phosphate battery is 2.5V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 3.0V;
ninth step: the battery is kept on the separate cabinet for 5min;
tenth step: discharging with constant current of 0.02C for 60min; the voltage limiting of the lithium iron phosphate battery is 2.0V, and the voltage limiting of the nickel cobalt lithium manganate battery is 2.5V;
eleventh step: the battery is kept on the separate cabinet for 5min;
twelfth step: charging with 0.3C constant current for 120min, limiting the charging capacity to 0.5 rated capacity, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 4.15V;
thirteenth step: and (5) ending.
Further optimizing: the data derived in step S4 includes: the method comprises the steps of a second-step constant-current constant-voltage charging cutoff current I1, a second-step charging capacity C1, a fourth-step constant-current discharging current I2, a sixth-step constant-current constant-voltage constant-current ratio H, a sixth-step constant-current constant-voltage charging cutoff current I3, an eighth-step constant-current discharging current I4, a tenth-step constant-current discharging current I5, a twelfth-step constant-current charging current I6, an eighth-step discharging capacity C2 and a twelfth-step charging capacity C3.
Further optimizing: in step S5, the judging data standard parameters includes:
i1max: the second step is that the upper limit of the cut-off current of constant-current constant-voltage charging is limited;
i1min: the second step is constant-current constant-voltage charging cut-off current lower limit;
c1max: a second step of charging capacity upper limit;
c1min: a second step of charging capacity lower limit;
i2max: fourth step, constant current discharge current upper limit;
i2min: fourth step, constant current discharge current lower limit;
hmax: sixth, constant current, constant voltage and constant current ratio upper limit;
hmin: sixth step, constant current, constant voltage and constant current ratio lower limit;
i3max: a sixth step of constant-current constant-voltage charging cut-off current upper limit;
i3min: a sixth step of constant-current constant-voltage charging cut-off current lower limit;
i4max: eighth step, constant current discharge current upper limit;
i4min: eighth step, constant current discharge current lower limit;
i5max: a tenth step of constant current discharge current upper limit;
i5min: a tenth step of constant current discharge current lower limit;
i6max: the twelfth step is constant current charging current upper limit;
i6min: a twelfth step of constant current charging current lower limit;
c2max: an eighth step upper discharge capacity limit;
c2min: eighth step, lower discharge capacity limit;
c3max: a twelfth step of charging capacity upper limit;
c3min: and a twelfth step of charging capacity lower limit.
Further optimizing: in step S6, the comparison criteria are: i1min is less than or equal to I1 and less than or equal to I1max; c1min is less than or equal to C1 and less than or equal to C1max; i2min is less than or equal to I2 and less than or equal to I2max; hmin is more than or equal to H and less than or equal to Hmax; i3min is less than or equal to I3 and less than or equal to I3max; i4min is less than or equal to I4 and less than or equal to I4max; i5min is less than or equal to I5 and less than or equal to I5max; i6min is less than or equal to I6 and less than or equal to I6max; c2min is less than or equal to C2 and less than or equal to C2max; c3min is less than or equal to C3 and less than or equal to C3max.
Further optimizing: in step S7, the defective battery is subjected to the capacity-dividing process again, and if the same problem occurs repeatedly for more than 2 times, the battery is subjected to the B-shift down process.
Further optimizing: in step S7, when the unqualified battery performs the capacity-dividing process again, if all the data of the battery meet the qualification requirements, further detecting the point position corresponding to the battery in the capacity-dividing cabinet.
By adopting the technical scheme, the invention has ingenious conception, can judge all factors which possibly influence the accuracy of the battery data by using the IF function through the preset judging data standard parameters, does not have judging errors, and can rapidly find out the battery with data abnormality due to one-to-one correspondence between the data and the battery point positions; by adopting the technical scheme, the labor intensity of workers can be reduced, and the judgment data can be accurate and quickly selected.
The invention is further illustrated below with reference to examples.
Drawings
Fig. 1 is a general flow chart of an embodiment of the present invention.
Detailed Description
Examples: referring to fig. 1, a method for selecting abnormal lithium ion batteries in a capacity-dividing process includes the following steps:
and (5) printing corresponding bar codes according to the cell lot numbers, the quantity and the materials.
In this example, the batch number of the battery is 100 batches, the number is 2000, and the material is BB.
The bar codes are coded from A100BB0001 to A100BB2000, wherein A100 represents: batch 100, BB represents: the material of the batch of batteries is BB;0001,: the battery is the first of the battery batches.
The rated capacity of the batch of cells was 100Ah.
According to the performance of the batch of batteries, the standard parameters of the judgment data of the batteries are set as follows:
the second step of constant-current constant-voltage charging cut-off current upper limit I1max is: 5050mA;
the second step of constant-current constant-voltage charging cut-off current lower limit I1min is as follows: 4500mA;
the second step has an upper limit of charge capacity C1max of: 80000mAh;
the lower limit C1min of the charging capacity in the second step is as follows: 70000mAh;
the fourth step is that the upper limit I2max of the constant current discharge current is: 50200mA;
the fourth step is that the lower limit I2min of constant current discharge current is: 49800mA;
the sixth step is that the upper limit Hmax of constant current, constant voltage and constant current ratio is: 99.99%;
the sixth step is that the constant current constant voltage constant current ratio lower limit Hmin is: 92%;
the sixth step of constant-current constant-voltage charging cut-off current upper limit I3max is: 1050mA;
the sixth step of constant-current constant-voltage charging cut-off current lower limit I3min is: 500mA;
the eighth step of constant current discharge current upper limit I4max is: 50200mA;
the eighth step of constant current discharge current lower limit I4min is: 49800mA;
the tenth step is that the upper limit I5max of the constant current discharge current is: 2100mA;
the tenth step of constant current discharge current lower limit I5min is: 1900mA;
the twelfth step of constant current charging current upper limit I6max is: 30200mA;
the twelfth step of constant current charging current lower limit I6min is: 29800mA;
the upper limit C2max of the discharge capacity of the eighth step is: 110000mAh;
the lower limit C2min of the discharge capacity of the eighth step is: 90000mAh;
the twelfth step of the upper limit of the charging capacity C3max is: 50200mAh;
the twelfth step of charging capacity lower limit C3min is: 49800mAh.
In this embodiment, the criterion parameters of the determination data may be stored in a screening criteria table of an Excel table, where the screening criteria table is as follows:
。
s1, battery upper cabinet: and placing the formed batteries for 16-24 h in an environment with the temperature of 25+/-2 ℃, and placing the batteries at various points in the separate container after the placement.
S2, sticking a bar code: after the battery is put in the cabinet, bar codes are pasted on the shell on the outer side of the battery, after the bar codes are pasted, the bar codes are scanned one by one for each battery sequentially by a bar code gun according to the data export sequence of the capacity-division cabinet, and the data in the bar codes of the batteries are imported into a screening table of an Excel table, wherein the screening table is shown in the following table:
。
as can be seen from the above table, the first column of the screening table is the sequence number; the second column is a battery bar code; and the third column is the point position in the battery corresponding capacity-dividing cabinet.
Wherein the point location is A-B-C, wherein A represents the number of the cabinet, B represents the number of the rows of the cabinet, and C represents the number of the batteries of the row B.
S3, carrying out capacity division on the battery (taking a battery with rated capacity of 100Ah as an example), wherein the capacity division flow is as follows:
the first step: placing the battery on a cabinet for 2min;
and a second step of: charging with 0.5C constant current and constant voltage, limiting the current to 0.05C, and keeping the time to 180min, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the nickel cobalt lithium manganate battery is 4.15V;
and a third step of: the battery is placed for 5min;
fourth step: discharging with constant current of 0.5C for 180min; the voltage limiting of the lithium iron phosphate battery is 2.5V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 3.0V;
fifth step: placing the battery on the separate container for 5min;
sixth step: charging with 0.5C constant current and constant voltage, limiting the current to 0.01C, and keeping the time to 180min, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the nickel cobalt lithium manganate battery is 4.15V;
seventh step: placing the battery on the separate container for 5min;
eighth step: discharging with constant current of 0.5C for 180min; the voltage limiting of the lithium iron phosphate battery is 2.5V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 3.0V;
ninth step: placing the battery on the separate container for 5min;
tenth step: discharging with constant current of 0.02C for 60min; the voltage limiting of the lithium iron phosphate battery is 2.0V, and the voltage limiting of the nickel cobalt lithium manganate battery is 2.5V;
eleventh step: placing the battery on the separate container for 5min;
twelfth step: charging with 0.3C constant current for 120min, limiting the charging capacity to 0.5 rated capacity, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 4.15V;
thirteenth step: and (5) ending.
S4, data export: after the capacity division is finished, data of a second-step constant-current constant-voltage charging cut-off current I1, a second-step charging capacity C1, a fourth-step constant-current discharging current I2, a sixth-step constant-current constant-voltage constant-current ratio H, a sixth-step constant-current constant-voltage charging cut-off current I3, an eighth-step constant-current discharging current I4, a tenth-step constant-current discharging current I5, a twelfth-step constant-current charging current I6, an eighth-step discharging capacity C2 and a twelfth-step charging capacity C3 in the capacity division process are led out.
The exported data are stored in a screening table of an Excel table, and the bar codes are guaranteed to correspond to the data one by one, and at the moment, the screening table is shown in the following table:
。
the judging data standard parameters in the screening standard table can adopt an if function to judge various data in the screening table, wherein the data judgment OK is carried out when various data in the capacity division process are within the range of the corresponding judging standard, and the NG is judged when the data judgment OK is out of the range of the judging standard (OK indicates that the battery is qualified and NG indicates that the battery has a problem).
In this embodiment, if functions are in the prior art, and may be written according to actual judgment data standard parameters.
After the completion of the determination, the determination results are shown in the following table:
。
as can be seen from the above table, the first inspection item at the point location 1-1-3 presents a problem, the battery is found on the separate container, the number "1" is marked on the battery with a red pen, the second inspection item at the point location 1-1-7 presents a problem, the battery is found on the separate container, the number "2" is marked on the battery with a red pen, and so on, the batteries with different problems are marked with different numbers with a red pen.
And (3) carrying out the capacity-dividing process for the selected problem battery for a plurality of times, discharging the problem of the cabinet if the same problem appears repeatedly for a plurality of times, and carrying out the B-shift down treatment on the battery if the problem exists in the battery.
In this embodiment, the problem cell may be subjected to the capacity division process 3 more times.
If the unqualified battery is subjected to the capacity-dividing process again, and each item of data of the battery meets the qualification requirements, the battery is free of problems, and whether the point position corresponding to the battery in the capacity-dividing cabinet is problematic is further detected.
By adopting the technical scheme, the problems of strict process and possible process abnormality of the lithium ion battery in the capacity-dividing process are fully considered, and the data of each stage which can influence the accuracy of final data in capacity division are integrated together, so that the battery with problems is picked out, and the capacity-dividing capacity data of the circulated battery is ensured to be accurate.
Alterations, modifications, substitutions and variations of the embodiments herein will be apparent to those of ordinary skill in the art in light of the teachings of the present invention without departing from the spirit and principles of the invention.
Claims (7)
1. A method for selecting abnormal lithium ion batteries in a capacity-dividing process is characterized by comprising the following steps of: the method comprises the following steps:
s1, battery upper cabinet: placing the formed batteries for 16-24 h in an environment with the temperature of 25+/-2 ℃, and placing the batteries at each point in the separate container after the placement is finished;
s2, sticking a bar code: pasting bar codes on a shell outside the battery, and scanning the bar codes of each battery by using a bar code gun to obtain data in the bar codes of the battery;
s3, capacity division: performing capacity division on the battery according to a set capacity division flow;
s4, data export: after the capacity division is finished, each item of data of the battery in the capacity division process is exported;
s5, setting standard parameters of judgment data: setting and judging data standard parameters according to the requirements of various data;
s6, data comparison: comparing the data derived in the step S4 with the standard parameters of the judgment data set in the step S5;
s7, selecting a battery: the qualified battery enters the next working procedure, the unqualified battery is taken down on the separating cabinet, and the unqualified battery is marked for classification and placement;
and S8, performing the capacity-dividing process on the unqualified battery again.
2. The method for selecting abnormal lithium ion batteries in a capacity separation process according to claim 1, wherein the method comprises the following steps: in step S3, the capacity-dividing flow is performed as follows:
the first step: placing the battery on a separate cabinet and placing for 2min;
and a second step of: charging with 0.5C constant current and constant voltage, limiting the current to 0.02C, and keeping the time to 180min, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the nickel cobalt lithium manganate battery is 4.15V;
and a third step of: the battery is kept on the separate cabinet for 5min;
fourth step: discharging with constant current of 0.5C for 180min; the voltage limiting of the lithium iron phosphate battery is 2.5V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 3.0V;
fifth step: the battery is kept on the separate cabinet for 5min;
sixth step: charging with 0.5C constant current and constant voltage, limiting the current to 0.02C, and keeping the time to 180min, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the nickel cobalt lithium manganate battery is 4.15V;
seventh step: the battery is kept on the separate cabinet for 5min;
eighth step: discharging with constant current of 0.5C for 180min; the voltage limiting of the lithium iron phosphate battery is 2.5V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 3.0V;
ninth step: the battery is kept on the separate cabinet for 5min;
tenth step: discharging with constant current of 0.02C for 60min; the voltage limiting of the lithium iron phosphate battery is 2.0V, and the voltage limiting of the nickel cobalt lithium manganate battery is 2.5V;
eleventh step: the battery is kept on the separate cabinet for 5min;
twelfth step: charging with 0.3C constant current for 120min, limiting the charging capacity to 0.5 rated capacity, wherein the voltage limiting of the lithium iron phosphate battery is 3.65V, and the voltage limiting of the lithium nickel cobalt manganese oxide battery is 4.15V;
thirteenth step: and (5) ending.
3. The method for selecting abnormal lithium ion batteries in a capacity separation process according to claim 2, wherein the method comprises the following steps: the data derived in step S4 includes: the method comprises the steps of a second-step constant-current constant-voltage charging cutoff current I1, a second-step charging capacity C1, a fourth-step constant-current discharging current I2, a sixth-step constant-current constant-voltage constant-current ratio H, a sixth-step constant-current constant-voltage charging cutoff current I3, an eighth-step constant-current discharging current I4, a tenth-step constant-current discharging current I5, a twelfth-step constant-current charging current I6, an eighth-step discharging capacity C2 and a twelfth-step charging capacity C3.
4. A method for selecting abnormal lithium ion batteries in a capacity separation process according to claim 3, wherein: in step S5, the judging data standard parameters includes:
i1max: the second step is that the upper limit of the cut-off current of constant-current constant-voltage charging is limited;
i1min: the second step is constant-current constant-voltage charging cut-off current lower limit;
c1max: a second step of charging capacity upper limit;
c1min: a second step of charging capacity lower limit;
i2max: fourth step, constant current discharge current upper limit;
i2min: fourth step, constant current discharge current lower limit;
hmax: sixth, constant current, constant voltage and constant current ratio upper limit;
hmin: sixth step, constant current, constant voltage and constant current ratio lower limit;
i3max: a sixth step of constant-current constant-voltage charging cut-off current upper limit;
i3min: a sixth step of constant-current constant-voltage charging cut-off current lower limit;
i4max: eighth step, constant current discharge current upper limit;
i4min: eighth step, constant current discharge current lower limit;
i5max: a tenth step of constant current discharge current upper limit;
i5min: a tenth step of constant current discharge current lower limit;
i6max: the twelfth step is constant current charging current upper limit;
i6min: a twelfth step of constant current charging current lower limit;
c2max: an eighth step upper discharge capacity limit;
c2min: eighth step, lower discharge capacity limit;
c3max: a twelfth step of charging capacity upper limit;
c3min: and a twelfth step of charging capacity lower limit.
5. The method for selecting abnormal lithium ion batteries in a capacity separation process according to claim 4, wherein the method comprises the following steps: in step S6, the comparison criteria are: i1min is less than or equal to I1 and less than or equal to I1max; c1min is less than or equal to C1 and less than or equal to C1max; i2min is less than or equal to I2 and less than or equal to I2max; hmin is more than or equal to H and less than or equal to Hmax; i3min is less than or equal to I3 and less than or equal to I3max; i4min is less than or equal to I4 and less than or equal to I4max; i5min is less than or equal to I5 and less than or equal to I5max; i6min is less than or equal to I6 and less than or equal to I6max; c2min is less than or equal to C2 and less than or equal to C2max; c3min is less than or equal to C3 and less than or equal to C3max.
6. The method for selecting abnormal lithium ion batteries in a capacity separation process according to claim 1, wherein the method comprises the following steps: in step S7, the defective battery is subjected to the capacity-dividing process again, and if the same problem occurs repeatedly for more than 2 times, the battery is subjected to the B-shift down process.
7. The method for selecting abnormal lithium ion batteries in a capacity separation process according to claim 1, wherein the method comprises the following steps: in step S7, when the unqualified battery performs the capacity-dividing process again, if all the data of the battery meet the qualification requirements, further detecting the point position corresponding to the battery in the capacity-dividing cabinet.
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