CN111151479A - Sorting and matching method for battery cores of lithium ion batteries - Google Patents
Sorting and matching method for battery cores of lithium ion batteries Download PDFInfo
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- CN111151479A CN111151479A CN202010003181.9A CN202010003181A CN111151479A CN 111151479 A CN111151479 A CN 111151479A CN 202010003181 A CN202010003181 A CN 202010003181A CN 111151479 A CN111151479 A CN 111151479A
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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
- B07C5/02—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
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a method for sorting and matching battery cells of a lithium ion battery, which is adopted, only by simply increasing the setting of grading parameters, voltage values in different states are added in a capacity grading process to be collected and analyzed, new equipment and processes are not required to be added, and the sorting and matching of charging and discharging curves are realized; and in the sorting process, the capacity, the voltage difference value and the K value are utilized to sort and match the battery pack, and the method can obviously improve the consistency of battery cell matching and improve the service life and the safety of the battery pack.
Description
Technical Field
The invention belongs to the technical field of electric cores of lithium ion batteries, and particularly relates to a sorting and grouping method of electric cores of lithium ion batteries.
Background
The lithium ion battery has the advantages of high mass and volume energy density, high output power, excellent cycle performance, stable discharge interval, rapid charge and discharge and the like, is widely applied to portable electronic equipment such as mobile phones, digital cameras, notebook computers and the like, is also widely applied to electric automobiles, electric bicycles, electric tools and energy storage, and has larger and larger market scale.
However, except for the main use of single battery cells such as mobile phones, digital cameras and small bluetooth batteries, other application fields are basically combined in series and parallel, especially in the fields of power batteries and energy storage. Because the cells of the single lithium ion battery have certain differences in performance, if the cells with larger differences in performance are grouped, the situation of overcharge or overdischarge can occur, the performance attenuation of the cells can be accelerated, and a safety problem can be caused in a serious case. Therefore, the cells of the lithium ion battery are to be paired in groups.
At present, the industrial production basically carries out grouping pairing on the electric cores of the lithium ion battery according to three aspects of capacity, internal resistance and voltage.
Disclosure of Invention
The battery pack can only ensure that the performance parameters of the single battery cell in the initial state of the battery pack are basically consistent according to three aspects of capacity, internal resistance and voltage, the three parameters are static data, the self-discharge speed and the charge-discharge depth of the single battery cell are different when the battery pack is actually used (factors such as storage, charge-discharge and environment) due to the fact that the differences of polarization internal resistance, self-discharge and the like of the battery cell are not considered, and the performance of the whole battery pack is reduced after a long time. Therefore, it is necessary to select a proper sorting and grouping method to group the cells with consistent static and dynamic performances together.
In order to overcome the defects in the prior art, the invention aims to provide a method for sorting and grouping battery cells of a lithium ion battery. By adopting the sorting and grouping method, sorting and grouping can be realized by utilizing a charge-discharge curve only by simply increasing the setting of the grading parameters without adding new equipment and procedures; the consistency of battery cell matching can be obviously improved, and the service life and the safety of the battery pack are improved.
The purpose of the invention is realized by the following technical scheme:
a sorting and grouping method for battery cells of a lithium ion battery comprises the following steps:
1) carrying out capacity test on a plurality of formed capacity-grading battery cores to be subjected to capacity grading by using a capacity-grading cabinet, collecting discharge capacity data as a grading parameter 1, and carrying out primary sorting and matching on the battery cores of the lithium ion battery;
2) and carrying out secondary sorting and matching on the lithium ion batteries in the same matching group, wherein the secondary sorting and matching comprises the following steps:
2-1) obtaining voltage values V of the battery cell under different charging states according to the charge-discharge curve obtained in the capacity testing process of the step 1)CiAnd/or voltage values V in different discharge statesDi(ii) a Wherein i represents a state of charge; calculating the average voltage value of the battery cell in different charging states
And/or average voltage values at different discharge states
Then calculates V againCiAnd
difference value Δ V ofCiAs a grading parameter 2, and/or calculating VDiAnd
difference value Δ V ofDiAs a grading parameter 3;
optionally, 2-2) performing high-temperature aging on the capacity-divided battery cell obtained in the step 1), then performing normal-temperature aging 1, and then performing normal-temperature aging 2; testing the voltage V1 and the internal resistance R1 of the battery cell after the normal-temperature aging 1 is finished, recording the testing time T1, testing the voltage V2 and the internal resistance R2 after the normal-temperature aging 2 is finished, and recording the testing time T2; calculating the K value of the battery cell as a grading parameter 4, and using the internal resistance R2 as a grading parameter 5; wherein the K value is (V1-V2)/(T2-T1);
3) and sorting and matching the results of the first sorting and matching and the second sorting and matching by using a grading device.
In the invention, the sorting and grouping refers to that the battery cores meeting the same conditions are used as a group according to the sorting principle of the method.
According to the present invention, in step 1), the capacity test is a test method known in the art.
According to the invention, in the step 1), the cells with abnormal capacity are taken as defective cells to be removed, and the cells with normal capacity are taken as non-defective cells.
Preferably, the capacity anomaly means that the capacity is smaller than the minimum value defined by the process parameters or larger than the maximum value defined by the process parameters. For example, the minimum value defined by the process parameter is 3600mAh, and the maximum value defined by the process parameter is 3800mAh, that is, the cells not in the range of 3600-3800mAh are marked as cells with abnormal capacity.
According to the present invention, in step 1), the discharge capacity data specifically includes, as the grading parameter 1: grading according to the capacity grade of the good product battery cell; preferably, 0.5-2% of any capacity of the good product battery cell is used as a grading gradient to be graded; the arbitrary capacity may be, for example, a minimum-sized capacity, a maximum-sized capacity, or an arbitrary capacity between the minimum-sized and the maximum-sized capacities;
illustratively, the grading is performed with a grading gradient of 0.5-2% of the minimum capacity of the specification; if the minimum specification capacity of the battery cell is 4000mAh, 0.5% of the minimum specification capacity is used as a grading gradient, namely 20mAh is used as the grading gradient, the first grade is 4000-.
According to the invention, in the step 2), the cells in the same capacity range are used as one group according to the sorting and grouping in the step 1), and secondary sorting and grouping are carried out.
According to the invention, in step 2-1), i represents the state of charge, which means a state of different charge or discharge, for exampleThe voltage value in the 20% charged state can be recorded as VC2For example, the voltage value in the 20% discharge state can be recorded as VD2。
According to the invention, in step 2-1), the different charge state refers to the ratio of the charge capacity to the total charge capacity, said ratio ranging between 0 and 100%, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%.
Exemplarily, the VCiFor example, the voltage values may be in a state of charging 10% SOC, 20% SOC, 30% SOC, 40% SOC, 50% SOC, 60% SOC, 70% SOC, 80% SOC, 90% SOC, or 100% SOC, respectively denoted as VC1、VC2、VC3、VC4、VC5、VC6、VC7、VC8、VC9Or VC10. Wherein, VC1Voltage value, V, representing a charging capacity of 10% (10% SOC) of the total charging capacityC2A voltage value representing a charging capacity of 20% (20% SOC) of the total charging capacity, and so on.
According to the invention, in step 2-1), V isCiAnd
difference value Δ V ofCiSpecifically, the step parameter 2 includes: according to the difference value delta V of charging voltageCiAnd (5) sorting and matching.
Preferably, the charging voltage difference Δ V is adjustedCiAnd sorting and matching the battery cores within a certain range.
For example, the difference Δ V of the charging voltageCiThe battery cores within the range of +/-5 mV are used as the same gear, and the charging voltage difference value delta V is usedCiTaking the battery cell in the range of 5-15 mV as the same gear, and taking the charging voltage difference value delta VCiCells in the range of-15 mV to-5 mV are taken as the same grade, and cells out of the range are taken as abnormal treatment.
As defined above, each cell has a difference Δ V at a charging stateCiThe difference value Δ V of a certain or several charging states can be selected according to actual operation requirementsCiAs a minuteGear parameter 2.
If the difference value DeltaV of a certain charging state is selectedCiWhen the step parameter 2 is used, the step parameter 2 of the cell with the highest ratio among the several step parameters 2 is preferably used, and for example, the difference Δ V in 5 charging states is selectedCiAs a stepping parameter 2, 5 stepping parameters 2 are obtained, of which 3 differences Δ VCiFor the same gear, the remaining 2 differences Δ VCiFor the same gear, 3 differences Δ V are selectedCiAnd taking the corresponding grading parameter 2 as the grading parameter 2 of the battery core.
According to the invention, in step 2-1), the different discharge states refer to the ratio of discharge capacity to total discharge capacity, which represents the depth of discharge, and the ratio ranges from 0% to 100%, for example 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%.
Exemplarily, the VDiFor example, the voltage values may be V, which are expressed as values of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100% DOD at dischargeD1、VD2、VD3、VD4、VD5、VD6、VD7、VD8、VD9Or VD10. Wherein, VD1The discharge capacity is represented by a voltage value, V, of 10% (10% DOD) of the total discharge capacityD2The discharge capacity was expressed as a voltage value of 20% of the total discharge capacity (20% DOD), and so on.
According to the invention, in step 2-1), V isDiAnd
difference value Δ V ofDiSpecifically, the step parameter 3 includes: according to the difference value DeltaV of the discharge voltageDiAnd (5) sorting and matching.
Preferably, the difference Δ V of the discharge voltagesDiAnd sorting and matching the battery cores within a certain range.
For example, the difference Δ V of the discharge voltageDiThe battery cores within the range of +/-5 mV are used as the same gear, and the difference value delta V of the discharge voltage is usedDiIn the range of 5 to 15mVThe electric core in the enclosure is used as the same gear, and the difference value delta V of the discharge voltage is usedDiCells in the range of-15 mV to-5 mV are taken as the same grade, and cells out of the range are taken as abnormal treatment.
As defined above, each cell has a difference Δ V in a discharge stateDiThe difference value delta V of a certain or several discharge states can be selected according to actual operation requirementsDiAs the binning parameter 3.
If the difference value DeltaV in a certain discharge state is selectedDiWhen the step parameter 3 is used, the step parameter 3 of the cell with the highest ratio among the several step parameters 2 is preferably used, and for example, the difference Δ V in 5 discharge states is selectedDiAs a stepping parameter 3, 5 stepping parameters 3 are obtained, of which 3 differences Δ VDiFor the same gear, the remaining 2 differences Δ VDiFor the same gear, 3 differences Δ V are selectedDiAnd taking the corresponding grading parameter 3 as the grading parameter 3 of the battery core.
According to the invention, in the step 2-2), the method further comprises the following steps:
and removing the electric core with abnormal voltage and/or internal resistance as a defective product.
Preferably, the voltage and internal resistance are abnormal, which means that the voltage or internal resistance is not in the process parameter requirement range. For example, when the process requirement of the 386283 model battery cell is about 50% SOC aging, the voltage is in the range of 3840mV-3880mV, the internal resistance is in the range of 28m omega-34 m omega, and the battery cell is good, and the battery cell which is not in the range is abnormal and is taken as a defective product to be removed.
According to the invention, in the step 2-2), the high-temperature aging refers to storing and standing for 2-7 days at 35-50 ℃.
According to the invention, in the step 2-2), the normal-temperature aging 1 and the normal-temperature aging 2 are stored for 2-7 days at 20-30 ℃.
According to the invention, in the step 2-2), the aging temperature and the aging time of the normal-temperature aging 1 and the normal-temperature aging 2 can be the same or different.
According to the invention, in step 2-2), the K value as the grading parameter 4 specifically comprises: and sorting and matching according to the K value.
Preferably, the cells with the K value within a certain range are sorted and matched.
For example, a cell with a K value of less than 0.03mV/h is used as the same level, a cell with a K value in the range of 0.03-0.06 mV/h is used as the same level, and a cell not in the above range is used as an abnormal treatment.
According to the invention, in step 2-2), the internal resistance R2 specifically includes, as the stepping parameter 5: sorting and matching are carried out according to the internal resistance R2.
Preferably, the cells with the internal resistance R2 in a certain range are sorted and grouped.
For example, the value of the internal resistance R2 is within 3m Ω as the first gear.
The invention has the beneficial effects that:
the invention provides a method for sorting and matching battery cells of a lithium ion battery, which is adopted, only by simply increasing the setting of grading parameters, voltage values in different states are added in a capacity grading process to be collected and analyzed, new equipment and processes are not required to be added, and the sorting and matching of charging and discharging curves are realized; and in the sorting process, the capacity, the voltage difference value and the K value are utilized to sort and match the battery pack, and the method can obviously improve the consistency of battery cell matching and improve the service life and the safety of the battery pack.
Drawings
Fig. 1 is a circulation curve diagram of a battery pack after different gears are assembled.
Detailed Description
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
Example 1
1. The model 386283 manufactured by Zhuhai Guanyu batteries GmbH is selected, the minimum capacity is 3600mAh, the nominal voltage is 3.8V, and the battery pack is required to be prepared into a 1P2S battery pack. The sorting and grouping process and test data are as follows:
(1) and (3) carrying out charge and discharge tests (a charge and discharge system is shown in table 1) on the battery cell to be subjected to capacity grading, and collecting charge and discharge data and capacity data. The charge and discharge data are shown in table 1, the capacity of the second row is used as grading parameter 1, the cells with the capacity not in 3600-3800mAh are removed as defective products, and the remaining cells are classified into 4 grades per 50mAh and are marked as A (capacity range 3600-.
TABLE 1 Capacity-divided charging and discharging system for battery cell
(2) Voltage value V of each battery cell in different charging stagesCiThe calculation of (2):
the total charge capacity is 3700mAh, and the corresponding voltage values of 10% (370mAh), 30% (1110mAh), 50% (1850mAh) and 70% (2590mAh) are respectively taken to obtain VC1，VC3，VC5，VC7(ii) a Calculating the average value of the charging voltage of the battery cell under the corresponding different charging capacity states to obtain the average value
Then, the voltage of each battery cell in different charging states is differed from the average value to obtain 4 grading parameters 2, namely delta VC1、ΔVC3、ΔVC5、ΔVC7(ii) a Will be delta VC1、ΔVC3、ΔVC5、ΔVC7The value is plus or minus 5mV as A gear, 5-15 mV as B gear, and-15-5 mV as C gear; if different gears exist, selecting the gear with the highest proportion as the grading parameter 2 of the battery cell, and treating the rest as abnormal batteries;
(3) standing each cell at 35 ℃ for 5 days, and aging at high temperature; standing at 20 ℃ for 5 days, performing normal-temperature aging 1, testing the voltage V1 and the internal resistance R1 of the battery cell after the normal-temperature aging 1 is finished, removing the battery cells with abnormal voltage and internal resistance, standing the good battery cells at 20 ℃ for 5 days, and performing normal-temperature aging 2; testing the voltage V2 and the internal resistance R2 of the battery cell after the normal-temperature aging 2 is finished, removing the battery cells with abnormal voltage and internal resistance, calculating the K value ((V1-V2)/(T2-T1)) of a good battery cell as a grading parameter 4, taking the K value at 0.03mV/h as an A grade, taking 0.03-0.06 mV/h as a B grade, and performing abnormal treatment on the rest; the internal resistance R2 is used as a grading parameter 5, the R2 value is 27-30 m omega and is used as an A grade, the R2 value is 30-33 m omega and is used as a B grade, and the rest is used for exception handling.
(4) And (3) sorting and matching the battery cells by utilizing the 4 grading parameters, namely marking the same gear codes according to the batteries with the 4 parameters at the same gear, wherein the represented capacity of the battery with the gear codes being AAAA is 3600-3650mAh and delta VCiThe cell has the following characteristics that the cell has the positive or negative 5mV, the K value is 0.03mV/h, the R2 value is 27-30 m omega, the represented capacity with the gear code BBAA is 3650-3700mAh, and the delta V isCiThe K value is between 5 and 15mV and is within 0.03 mV/h; the battery cell with the R2 value of 27-30 m omega;
TABLE 2 Battery cell sorting and grouping data
(5) And (3) verification: the battery cell with the gear BAAB is selected from the battery cells which are graded, the serial numbers of the battery cells are 10 and 23, so that a battery pack is formed, and the serial number is 1 #; the serial numbers of the battery packs are 4 and 30 with the gear positions of CBBB, and the serial numbers are 2 #; the battery pack is formed by battery cells with the BABA serial number of 7 and the BACA serial number of 17, and the battery cells are numbered in a number of 3 #; the results of the cycle tests of the 3-pack batteries, in which the 1# and the 2# are experimental groups and the 3# is comparative group, are shown in fig. 1, and it can be seen that the capacity retention rate of the 3# battery is significantly lower than that of the 1# and the 2# batteries.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sorting and grouping method for battery cells of a lithium ion battery comprises the following steps:
1) carrying out capacity test on a plurality of formed capacity-grading battery cores to be subjected to capacity grading by using a capacity-grading cabinet, collecting discharge capacity data as a grading parameter 1, and carrying out primary sorting and matching on the battery cores of the lithium ion battery;
2) and carrying out secondary sorting and matching on the lithium ion batteries in the same matching group, wherein the secondary sorting and matching comprises the following steps:
2-1) obtaining voltage values V of the battery cell under different charging states according to the charge-discharge curve obtained in the capacity testing process of the step 1)CiAnd/or voltage values V in different discharge statesDi(ii) a Wherein i represents a state of charge; calculating the average voltage value of the battery cell in different charging states
And/or average voltage values at different discharge states
Then calculates V againCiAnd
difference value Δ V ofCiAs a grading parameter 2, and/or calculating VDiAnd
difference value Δ V ofDiAs a grading parameter 3;
optionally, 2-2) performing high-temperature aging on the capacity-divided battery cell obtained in the step 1), then performing normal-temperature aging 1, and then performing normal-temperature aging 2; testing the voltage V1 and the internal resistance R1 of the battery cell after the normal-temperature aging 1 is finished, recording the testing time T1, testing the voltage V2 and the internal resistance R2 after the normal-temperature aging 2 is finished, and recording the testing time T2; calculating the K value of the battery cell as a grading parameter 4, and using the internal resistance R2 as a grading parameter 5; wherein the K value is (V1-V2)/(T2-T1);
3) and sorting and matching the results of the first sorting and matching and the second sorting and matching by using a grading device.
2. The method of claim 1, wherein in step 1), the cells with abnormal capacity are removed as defective cells, and the cells with normal capacity are used as good cells;
preferably, the capacity anomaly means that the capacity is smaller than the minimum value defined by the process parameters or larger than the maximum value defined by the process parameters.
3. The method according to claim 1 or 2, wherein in step 1), the discharge capacity data as the grading parameter 1 specifically comprises: grading according to the capacity grade of the good product battery cell; preferably, 0.5-2% of any capacity of the good product battery cell is used as a grading gradient to be graded; the above-mentioned arbitrary capacity may be, for example, a minimum-sized capacity, a maximum-sized capacity, or an intermediate capacity between the both.
4. The method according to any one of claims 1 to 3, wherein in step 2), the cells in the same capacity range are grouped as one group according to the grouping of step 1), and the secondary grouping is performed.
5. The method according to any one of claims 1-4, wherein in step 2-1), said different state of charge is a ratio of charge capacity to total charge capacity, said ratio ranging between 0-100%;
in step 2-1), said VCiAnd
difference value Δ V ofCiSpecifically, the step parameter 2 includes: sorting and matching according to the charging voltage difference;
preferably, sorting and grouping the cells with the charging voltage difference value within a certain range;
for example, cells having a charging voltage difference within a range of ± 5mV are set as the same level, cells having a charging voltage difference within a range of 5 to 15mV are set as the same level, cells having a charging voltage difference within a range of-15 to-5 mV are set as the same level, and cells not within the above range are treated as abnormal.
6. The method according to any one of claims 1 to 4, wherein in the step 2-1), the different discharge states refer to a ratio of discharge capacity to total discharge capacity, which represents a depth of discharge, and the ratio ranges from 0 to 100%;
in step 2-1), said VDiAnd
difference value Δ V ofDiSpecifically, the step parameter 3 includes: sorting and matching according to the discharge voltage difference;
preferably, sorting and grouping the cells with the discharge voltage difference value within a certain range;
for example, cells having a discharge voltage difference within a range of ± 5mV are set as the same level, cells having a discharge voltage difference within a range of 5 to 15mV are set as the same level, cells having a discharge voltage difference within a range of-15 to-5 mV are set as the same level, and cells not within the above range are treated as abnormal.
7. The method according to any one of claims 1-6, wherein in step 2-2), further comprising the steps of:
removing the cells with abnormal voltage and/or internal resistance obtained by testing as defective products;
preferably, the voltage and internal resistance are abnormal, which means that the voltage or internal resistance is not in the process parameter requirement range.
8. The method according to any one of claims 1 to 7, wherein in the step 2-2), the high-temperature aging is storage at 35 to 50 ℃ for 2 to 7 days;
in the step 2-2), the normal-temperature aging 1 and the normal-temperature aging 2 are stored at the temperature of 20-30 ℃ for 2-7 days;
in the step 2-2), the aging temperature and the aging time of the normal-temperature aging 1 and the normal-temperature aging 2 can be the same or different.
9. The method according to any one of claims 1 to 8, wherein in step 2-2), the K value as a grading parameter 4 specifically comprises: sorting and matching according to the K value;
preferably, sorting and matching the cells with the K values within a certain range;
for example, a cell with a K value of less than 0.03mV/h is used as the same level, a cell with a K value in the range of 0.03-0.06 mV/h is used as the same level, and a cell not in the above range is used as an abnormal treatment.
10. The method according to any one of claims 1 to 9, wherein in step 2-2), the internal resistance R2 as the grading parameter 5 specifically comprises: sorting and matching according to the internal resistance R2;
preferably, sorting and grouping the cells with the internal resistance R2 in a certain range;
for example, the value of the internal resistance R2 is within 3m Ω as the first gear.
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| CN111740175A (en) * | 2020-06-30 | 2020-10-02 | 梅州市量能新能源科技有限公司 | Battery grouping method |
| CN112151890A (en) * | 2020-10-10 | 2020-12-29 | 珠海冠宇电池股份有限公司 | Low-temperature matching method of lithium ion battery pack and lithium ion battery pack |
| CN112285584A (en) * | 2020-10-16 | 2021-01-29 | 合肥国轩高科动力能源有限公司 | Lithium battery cell adjusting device and cell adjusting and grouping method |
| CN113013498A (en) * | 2021-02-22 | 2021-06-22 | 天能电池集团股份有限公司 | Method for judging lead storage battery assembly quality |
| CN114082680A (en) * | 2021-11-22 | 2022-02-25 | 芜湖天弋能源科技有限公司 | Method for optimizing cycle performance of lithium battery module |
| CN114421016A (en) * | 2021-12-16 | 2022-04-29 | 山东天瀚新能源科技有限公司 | Formation and aging process for cylindrical lithium battery |
| CN114951042A (en) * | 2022-05-12 | 2022-08-30 | 华富(江苏)锂电新技术有限公司 | Screening method for improving uniformity of echelon batteries |
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Address after: 519180 No. 209 Pearl Peak Avenue, Jingan Town, Doumen District, Zhuhai City, Guangdong Province Applicant after: Zhuhai Guanyu Battery Co.,Ltd. Address before: 519180 No. 209 Pearl Peak Avenue, Jingan Town, Doumen District, Zhuhai City, Guangdong Province Applicant before: ZHUHAI COSLIGHT BATTERY Co.,Ltd. |
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Application publication date: 20200515 |