CN112397788A - Novel battery capacity grading and grouping method - Google Patents
Novel battery capacity grading and grouping method Download PDFInfo
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- CN112397788A CN112397788A CN202011272687.6A CN202011272687A CN112397788A CN 112397788 A CN112397788 A CN 112397788A CN 202011272687 A CN202011272687 A CN 202011272687A CN 112397788 A CN112397788 A CN 112397788A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims description 22
- 230000010287 polarization Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000009469 supplementation Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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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
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a novel battery capacity grading and grouping method, which comprises the steps of grading single batteries according to capacity grades and grading the single batteries with similar capacities in the same gear. And then, carrying out high-temperature aging on the battery at the same gear, testing the open-circuit voltage of each single battery after the aging is finished, and removing the single batteries with unqualified open-circuit voltages. And then, carrying out normal-temperature shelving on qualified assembled single batteries, carrying out voltage and internal resistance sorting on the batteries at the same gear after the shelving is finished, dividing the voltage of the single battery into the same gear within a preset voltage range, simultaneously testing the internal resistance of the single battery, determining that the single battery is qualified when the internal resistance of the single battery is smaller than or equal to a preset internal resistance value, determining that the single battery is unqualified when the internal resistance of the single battery is larger than the preset internal resistance value, and rejecting the single battery. And finally, the single batteries which are divided into the same gear are grouped according to the required number of the groups, so that the consistency of the single batteries is ensured.
Description
Technical Field
The invention relates to a novel battery capacity grading and grouping method, and belongs to the field of battery production.
Background
In the production process of the lithium ion battery, consistency differences exist among battery individuals due to various reasons, such as internal resistance differences, capacity differences, self-discharge size differences, discharge platform differences and the like. The consistency difference between individuals causes the performance of the battery individuals to be inconsistent, so batteries with close performance need to be matched and grouped together. If the batteries are not matched properly, the service life of the whole battery pack is reduced, the use technical requirements cannot be met, and fire and explosion can happen seriously.
In the prior art, a single battery is generally charged and discharged with large current to screen capacity for capacity grading, and then the capacity grading is carried out through parameters of static internal resistance, open-circuit voltage, capacity, discharge platform, self-discharge and the like of the single battery. The prior art mainly has the following defects that the polarization of internal resistance and the self-discharge difference of the single battery under different environments and SOC conditions are not considered. The single batteries are generally charged and discharged with high multiplying power after being grouped, and even the single batteries are charged and discharged with high multiplying power in a high-temperature severe environment. Under the condition of high-temperature and high-rate charge and discharge, the single battery has large heat productivity, the temperature of the battery rises, the polarization of the internal resistance of the single battery is easily caused, the polarization of the internal resistance further causes the self-discharge difference of the single battery, and the single batteries with the same capacity cannot be completely charged and discharged at the same time. Therefore, the charge and discharge capacity of the grouped batteries is influenced, the attenuation of the single batteries is accelerated, and the service life of the single batteries is shortened.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a novel battery capacity grading and grouping method.
In order to solve the technical problems, the invention provides the following technical scheme:
a novel battery capacity grading and grouping method comprises the following steps:
s1: detecting the capacity of each single battery, grouping according to the capacity value of each single battery according to a preset grade, and dividing into a plurality of grades;
s11: charging each single battery to a preset upper voltage limit value V1 by a constant current and a constant voltage, standing the single battery on a charging and discharging device after the charging is ended, discharging to a preset lower voltage limit value V2 by a constant current and a constant voltage after the standing is ended, standing the single battery on the charging and discharging device after the discharging is ended, circulating the steps for three times, and recording the capacity data A of the single battery during the last discharging;
s12: after the step of S11, the single batteries are supplemented with the constant current of the preset current value, and the single batteries are placed on the charging and discharging equipment after the electricity supplementation is finished;
s13: s12, standing for 5 minutes, comparing the single battery capacity data A with a preset capacity grade Cx, and classifying the single battery into the Cx capacity grade if the single battery capacity A is within the preset capacity grade Cx range, and matching the single batteries with the same capacity grade Cx;
s2: carrying out high-temperature aging at 45 +/-2 ℃ for a preset time period on the Cx capacity grade single batteries matched in the step S13;
s3: after the high-temperature aging is finished, the open-circuit voltage V3 of each single battery is measured completely, the open-circuit voltage V3 is compared with a preset open-circuit voltage range Vx, the open-circuit voltage V3 is not qualified when being lower than the lower limit of the preset open-circuit voltage range Vx or higher than the upper limit of the preset open-circuit voltage range Vx, and the single battery is rejected;
s4: the qualified single assembled battery with the open-circuit voltage is placed for 10 days at the normal temperature of 25 +/-2 ℃;
s5: testing the open-circuit voltage value V4 and the internal resistance value R of each single battery after the step S4 is finished; comparing the open-circuit voltage value V4 with a preset grouping voltage grade Vi, and if the single voltage value V4 is within the range of the preset grouping voltage grade Vi, then the single batteries are grouped; comparing the internal resistance value R with the preset internal resistance value R0, if the internal resistance value R is less than or equal to R0, matching the internal resistance value R with the preset internal resistance value R0 to be qualified, matching the internal resistance value R with the preset internal resistance value R0 to be a group, and if the internal resistance value R is greater than R0, rejecting the group.
Further, in S11, a three-cycle charge and discharge test is performed on the single battery with a small current of 0.5C, and the single battery needs to be left for 5 minutes after each charge and discharge is completed to ensure the stability and accuracy of the capacity test of the single battery, and the third discharge capacity is taken as the reference capacity of the single battery.
Further, in S12, after the end of the charge and discharge in S11, the preset current value for charging each cell is 0.3C to 0.5C, and the cell is charged at a constant current for 1 hour so that the charge amount of the cell is 30% to 50% SOC.
Further, in the step S13, the preset capacity classes Cx are arranged from low to high, and the unit battery capacity a is not qualified if it is lower than the lowest preset capacity class Cx or higher than the highest preset capacity class Cx, and is rejected.
Further, in the step S2, the high-temperature aging period of the preset time is 7 to 10 days, and the high-temperature aging simulates the battery usage environment, so that the polarization of the internal resistance of the single battery is accelerated.
The invention has the following beneficial effects: the method comprises the steps of grading the single batteries according to the capacity grades, and grading the single batteries with similar capacities in the same gear. And then, carrying out high-temperature aging on the battery at the same gear, testing the open-circuit voltage of each single battery after the aging is finished, and removing the single batteries with unqualified open-circuit voltages. And then, carrying out normal-temperature shelving on qualified assembled single batteries, carrying out voltage and internal resistance sorting on the batteries at the same gear after the shelving is finished, dividing the voltage of the single battery into the same gear within a preset voltage range, simultaneously testing the internal resistance of the single battery, determining that the single battery is qualified when the internal resistance of the single battery is smaller than or equal to a preset internal resistance value, determining that the single battery is unqualified when the internal resistance of the single battery is larger than the preset internal resistance value, and rejecting the single battery. And finally, the single batteries which are divided into the same gear are grouped according to the required number of the groups, so that the consistency of the single batteries is ensured.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Examples
The invention discloses a new battery capacity grading and grouping method, which comprises the following steps:
and S1, detecting the capacity of each single battery, grouping according to the capacity value of each single battery according to the preset grade, and dividing into a plurality of grades.
And S11, charging each single battery to a preset upper voltage limit value of 3.65V at a constant current and constant voltage of 0.5C, standing the single battery on a charging and discharging device for 5 minutes after the charging is finished, discharging to a preset lower voltage limit value of 2.0V at a constant current and constant voltage of 0.5C after the standing is finished, standing the single battery on the charging and discharging device for 5 minutes after the discharging is finished, repeating the steps for three times, and recording the capacity data A of the single battery during the last discharging.
And S12, after the third discharging and standing for 5 minutes in the S11 step is finished, the single batteries are supplemented with constant current for 1 hour at a preset current value, and after the electricity supplementation is finished, the single batteries are placed on a charging and discharging device for 5 minutes.
And S13, after standing for 5 minutes, comparing the single battery capacity data A with a preset capacity grade Cx, and classifying the single battery into the Cx capacity grade if the single battery capacity A is within the preset capacity grade Cx range, and matching the single batteries with the same capacity grade Cx.
Note that, the capacity class CXIs a range, does not count against a number, and is related to product specifications. For example, 6000mAh size battery, the capacity grade is CXComprises the following steps: 5800mAh, 5800-6000 mAh, 6000-6050 mAh, 6050-6100 mAh, 6100-6150 mAh, 6150-6200 mAh, 6200-6250 mAh, 6250-6300 mAh, 6300-6350 mAh, 6350-6400 mAh, 6400-6450 mAh, 6450-6500 mAh, more than or equal to 6500mAh and the like, namely the single batteries in the same capacity grade range are prepared into a group.
And S2, carrying out high-temperature aging at 45 +/-2 ℃ for a preset time period on the 6100-6150 mAh capacity grade single batteries matched in the step S13.
S3: and after the high-temperature aging is finished, the open-circuit voltage V3 of each single battery is measured completely, the open-circuit voltage V3 is compared with the preset open-circuit voltage range of 3.10-3.30V, the open-circuit voltage V1 is lower than the lower limit of the preset open-circuit voltage range of 3.10-3.30V or higher than the upper limit of the preset open-circuit voltage range of 3.10-3.30V, and the upper limit is not qualified, so that the single battery is rejected.
S4: the qualified single assembled battery with the open-circuit voltage is kept for 10 days at the normal temperature of 25 +/-2 ℃.
S5, testing the open-circuit voltage value V2 and the internal resistance value R of each single battery after the step S4 is finished; comparing the open-circuit voltage value V2 with a preset grouping voltage grade Vi, and if the single voltage value V2 is within the range of the preset grouping voltage grade Vi, then the single batteries are grouped; comparing the internal resistance value R with the preset internal resistance value R0, if the internal resistance value R is less than or equal to R0, matching the internal resistance value R with the preset internal resistance value R0 to be qualified, matching the internal resistance value R with the preset internal resistance value R0 to be unqualified, and rejecting the qualified products.
It should be noted that the preset grouping voltage level Vi is a range, 5mv being a level range. The ranges are as follows: 3240 mv-3245,3245 mv-3250,3250 mv-3255,3255 mv-3260,3265 mv-3270, 3270 mv-3275,3275 mv-3280,3280 mv-3285, not more than 3240mv and not more than 3285mv, namely, the single batteries in the same open circuit voltage range are matched into a group.
It should be noted that the preset internal resistance R0 is related to the product type, and the preset internal resistance R0 is different for different product types, and generally has 3m Ω, 8m Ω, and the like.
In the technical scheme, the single batteries are subjected to capacity grading, grading is carried out according to capacity grades, and the single batteries with similar capacities are classified in the same gear. And then, carrying out high-temperature aging on the battery at the same gear, testing the open-circuit voltage of each single battery after the aging is finished, and removing the single batteries with unqualified open-circuit voltages. And then, carrying out normal-temperature shelving on qualified assembled single batteries, carrying out voltage and internal resistance sorting on the batteries at the same gear after the shelving is finished, dividing the voltage of the single battery into the same gear within a preset voltage range, simultaneously testing the internal resistance of the single battery, determining that the single battery is qualified when the internal resistance of the single battery is smaller than or equal to a preset internal resistance value, determining that the single battery is unqualified when the internal resistance of the single battery is larger than the preset internal resistance value, and rejecting the single battery. And finally, the single batteries which are divided into the same gear are grouped according to the required number of the groups, so that the consistency of the single batteries is ensured.
The invention has the practical effects that the event service environment of the battery is comprehensively considered, the consistency of the single batteries which are matched into a group under the actual service condition can be effectively improved, the charge and discharge efficiency of the matched battery is improved, and the service life of the matched battery is prolonged.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (5)
1. A novel battery capacity grading and grouping method is characterized by comprising the following steps:
s1: detecting the capacity of each single battery, grouping according to the capacity value of each single battery according to a preset grade, and dividing into a plurality of grades;
s11: charging each single battery to a preset upper voltage limit value V1 by a constant current and a constant voltage, standing the single battery on a charging and discharging device after the charging is ended, discharging to a preset lower voltage limit value V2 by a constant current and a constant voltage after the standing is ended, standing the single battery on the charging and discharging device after the discharging is ended, circulating the steps for three times, and recording the capacity data A of the single battery during the last discharging;
s12: after the step of S11, the single batteries are supplemented with the constant current of the preset current value, and the single batteries are placed on the charging and discharging equipment after the electricity supplementation is finished;
s13: s12, standing for 5 minutes, comparing the single battery capacity data A with a preset capacity grade Cx, and classifying the single battery into the Cx capacity grade if the single battery capacity A is within the preset capacity grade Cx range, and matching the single batteries with the same capacity grade Cx;
s2: carrying out high-temperature aging at 45 +/-2 ℃ for a preset time period on the Cx capacity grade single batteries matched in the step S13;
s3: after the high-temperature aging is finished, the open-circuit voltage V3 of each single battery is measured completely, the open-circuit voltage V3 is compared with a preset open-circuit voltage range Vx, the open-circuit voltage V3 is not qualified when being lower than the lower limit of the preset open-circuit voltage range Vx or higher than the upper limit of the preset open-circuit voltage range Vx, and the single battery is rejected;
s4: the qualified single assembled battery with the open-circuit voltage is placed for 10 days at the normal temperature of 25 +/-2 ℃;
s5: testing the open-circuit voltage value V4 and the internal resistance value R of each single battery after the step S4 is finished; comparing the open-circuit voltage value V4 with a preset grouping voltage grade Vi, and if the single voltage value V4 is within the range of the preset grouping voltage grade Vi, then the single batteries are grouped; comparing the internal resistance value R with the preset internal resistance value R0, if the internal resistance value R is less than or equal to R0, matching the internal resistance value R with the preset internal resistance value R0 to be qualified, matching the internal resistance value R with the preset internal resistance value R0 to be a group, and if the internal resistance value R is greater than R0, rejecting the group.
2. The method as claimed in claim 1, wherein in S11, the single battery is first tested by charging and discharging with 0.5C low current for three cycles, and the single battery is left for 5 minutes after each charging and discharging to ensure the stability and accuracy of the single battery capacity test, and the third discharging capacity is taken as the reference capacity of the single battery.
3. The method as claimed in claim 1, wherein in step S12, after the charge/discharge in step S11 is completed, the preset current value for recharging each cell is 0.3C to 0.5C, and the cell is charged at 30% to 50% SOC by charging at constant current for 1 hour.
4. The method as claimed in claim 1, wherein in S13, predetermined capacity classes Cx are arranged from low to high, and the battery cell capacity a is not qualified below the lowest predetermined capacity class Cx or above the highest predetermined capacity class Cx, and is rejected.
5. The method as claimed in claim 1, wherein in S2, the aging period is 7-10 days, and the aging simulates the environment of battery usage to accelerate polarization of the internal resistance of the battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011272687.6A CN112397788A (en) | 2020-11-13 | 2020-11-13 | Novel battery capacity grading and grouping method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011272687.6A CN112397788A (en) | 2020-11-13 | 2020-11-13 | Novel battery capacity grading and grouping method |
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| CN112397788A true CN112397788A (en) | 2021-02-23 |
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| CN202011272687.6A Pending CN112397788A (en) | 2020-11-13 | 2020-11-13 | Novel battery capacity grading and grouping method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447837A (en) * | 2021-09-01 | 2021-09-28 | 深圳联钜自控科技有限公司 | Temperature measurement and control system for high-temperature formation process of soft package lithium battery |
| CN113484786A (en) * | 2021-07-23 | 2021-10-08 | 广州鹏辉能源科技股份有限公司 | Lithium battery grouping method and device, computer equipment and readable storage medium |
| CN113820607A (en) * | 2021-08-12 | 2021-12-21 | 双登集团股份有限公司 | Battery high-voltage matching detection process for high-voltage scene |
-
2020
- 2020-11-13 CN CN202011272687.6A patent/CN112397788A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484786A (en) * | 2021-07-23 | 2021-10-08 | 广州鹏辉能源科技股份有限公司 | Lithium battery grouping method and device, computer equipment and readable storage medium |
| CN113820607A (en) * | 2021-08-12 | 2021-12-21 | 双登集团股份有限公司 | Battery high-voltage matching detection process for high-voltage scene |
| CN113447837A (en) * | 2021-09-01 | 2021-09-28 | 深圳联钜自控科技有限公司 | Temperature measurement and control system for high-temperature formation process of soft package lithium battery |
| CN113447837B (en) * | 2021-09-01 | 2021-11-26 | 深圳联钜自控科技有限公司 | Temperature measurement and control system for high-temperature formation process of soft package lithium battery |
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