CN113369177A - Screening method for lithium battery consistency - Google Patents
Screening method for lithium battery consistency Download PDFInfo
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- CN113369177A CN113369177A CN202110687479.0A CN202110687479A CN113369177A CN 113369177 A CN113369177 A CN 113369177A CN 202110687479 A CN202110687479 A CN 202110687479A CN 113369177 A CN113369177 A CN 113369177A
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- battery
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012216 screening Methods 0.000 title claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 16
- 239000000178 monomer Substances 0.000 claims abstract description 92
- 238000007600 charging Methods 0.000 claims abstract description 34
- 238000007599 discharging Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000010277 constant-current charging Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 102000004310 Ion Channels Human genes 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
-
- 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
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
The invention discloses a screening method for lithium battery consistency, which comprises the following steps: placing the battery monomer subjected to the formation treatment at a high temperature; connected in series to form a battery pack, and is set aside at a preset temperature t 1; performing constant-current discharging and charging operation on each battery cell in the battery pack; simultaneously detecting the temperature change of each battery monomer in the discharging and charging processes, drawing a dynamic temperature distribution diagram of each battery monomer according to the temperature detection result, and removing the outlier battery monomer; performing constant-current discharging and charging on each battery monomer in the battery pack again, and simultaneously performing voltage detection; and drawing a dynamic voltage distribution diagram of each battery monomer according to the voltage detection result, comparing and analyzing the dynamic voltage distribution diagrams of the plurality of battery monomers, and screening the outlier battery monomer. The unqualified battery monomers are removed for three times, so that the screening quality of the battery is remarkably improved, and the screened battery monomers are ensured to well keep consistency.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a screening method for lithium battery consistency.
Background
The lithium ion battery has high energy density, good rate capability and long service life, is widely used, and particularly has huge amount of used lithium ion battery monomers in the fields of energy storage and electric automobiles. As many as tens or even hundreds of unit cells are generally connected in series or in parallel to form a battery pack to achieve a desired voltage and current.
Even the cells produced in the same batch may have variability due to manufacturing process limitations. If the battery pack is randomly assembled without screening, the deterioration of an ion channel and an electron channel in the battery and the activity of chemical substances in the battery are reduced in the charging and discharging process, so that the difference of the monomers is gradually increased, the service life of the battery is finally shortened, and the service life of the whole battery pack is seriously shortened.
The common screening method is to measure the internal resistance, capacity and self-discharge rate of each single battery separately and compare them. However, the method has more processes and longer time consumption, and the testing environment and conditions are changed in the process of long-time measurement, so that the measurement result is easily influenced, and the accuracy of consistency screening is reduced.
Disclosure of Invention
In order to solve the technical problems in the background art, the application provides a screening method for lithium battery consistency.
The specific technical scheme of the invention is as follows:
a screening method for lithium battery consistency comprises the following steps:
s1: placing the battery monomer subjected to the formation treatment at a high temperature;
s2: connecting a plurality of battery monomers after high-temperature placement in series to form a battery pack, and placing at t1 at a preset temperature;
s3: performing constant-current discharging and charging operation on each battery monomer in the battery pack at a preset temperature; simultaneously detecting the temperature change of each battery monomer in the discharging and charging processes, drawing a dynamic temperature distribution diagram of each battery monomer according to the temperature detection result, and removing the outlier battery monomer;
s4: performing constant-current discharging and charging on each battery monomer in the battery pack again, and simultaneously performing voltage detection;
s5: and drawing a dynamic voltage distribution diagram of each battery monomer according to the voltage detection result, comparing and analyzing the dynamic voltage distribution diagrams of the plurality of battery monomers, and screening the outlier battery monomer.
Further, in the step S1, after the formation is finished, the cover plate and the shell of the battery cell are checked, and the battery cell with leakage is removed.
Further, in the step S1, after the formation treatment, the battery cell after the liquid injection and sealing is subjected to normal temperature standing for 6-10 hours. After the battery liquid injection and sealing are finished, the battery is kept standing at normal temperature, so that the stability of the battery monomer is facilitated.
In a further scheme, the high-temperature shelf life refers to shelf life for 40-60 h at the temperature of 45-60 ℃.
In a further scheme, the preset temperature in the steps S2 and S3 is 20-30 ℃, and the current for constant current discharging and charging is 1-3 ℃. The influence on the performance of the battery cell caused by the temperature change is prevented, and the inaccuracy of detection is avoided.
In a further scheme, in the step S3, the constant current discharging is to discharge the plurality of battery cells at a constant current until the voltage of any battery cell reaches a preset discharge cut-off voltage, and the t2 is set aside; so that each battery monomer adapts to the environment after discharging, and the influence caused by voltage change in the charging process is avoided.
And in the constant current charging, the plurality of battery cells are subjected to constant current charging until the voltage of any battery cell reaches a preset charging cut-off voltage, and t3 is set aside.
In a further embodiment, the time of t1, t2 and t3 is equal and is 8-10 minutes. The stable time after the charging and the discharging of the battery is controlled to be the same, and the influence on the performance of the battery monomer caused by unequal shelf time is avoided.
In a further scheme, the preset discharge cut-off voltage is 2.0V-3.0V, and the preset charge cut-off voltage is 3.5V-4.3V. When any battery monomer reaches the voltage, the circuit is interrupted and the discharging is stopped; and stopping charging so as to enable the internal state of the battery monomer to gradually reach a stable state and avoid the influence generated by voltage change in the subsequent discharging process.
The screening method comprises the following three steps: the first step is that the cover plate and the shell of the battery monomer are checked after the formation is finished, and the leaked battery monomer is removed; the second step is to remove the outlier battery monomer through temperature; the third step is to remove the outlier battery cells by voltage. Therefore, the screening quality of the battery is remarkably improved, the screened battery monomers are guaranteed to well keep consistency, the difference between the battery monomers is reduced, the service life of the battery can be prolonged, and the service life of the whole battery pack is prolonged.
Detailed Description
The present application is described in further detail below.
Example 1:
a screening method for lithium battery consistency comprises the following steps:
s1: carrying out formation treatment on the battery monomer after liquid injection and sealing, standing for 6-10h at normal temperature after formation is finished, then checking a cover plate and a shell of the battery monomer, and removing the leaked battery monomer; then, the qualified battery monomer is placed for 40-60 h at the temperature of 45-60 ℃;
s2: connecting a plurality of battery monomers after being placed at high temperature in series to form a battery pack, and placing for 8-10 minutes at 20-30 ℃;
s3: performing 1C-3C constant current discharging and charging operation on each battery monomer in the battery pack at the temperature of 20-30 ℃; simultaneously detecting the temperature change of each battery monomer in the discharging and charging processes, drawing a dynamic temperature distribution diagram of each battery monomer according to the temperature detection result, and removing the outlier battery monomer;
the constant current discharge is to discharge a plurality of battery monomers in a constant current manner until the voltage of any battery monomer reaches a preset discharge cut-off voltage of 2.0V-3.0V, and the battery monomers are left for 8-10 minutes;
the constant current charging is to charge a plurality of battery monomers 1C-3C in a constant current manner until the voltage of any battery monomer reaches a preset charging cut-off voltage of 3.5V-4.3V, and the battery monomers are left for 8-10 minutes.
S4: performing 1C-3C constant current discharging and charging on each battery monomer in the battery pack again, and simultaneously performing voltage detection;
s5: and drawing a dynamic voltage distribution diagram of each battery monomer according to the voltage detection result, comparing and analyzing the dynamic voltage distribution diagrams of the plurality of battery monomers, and screening the outlier battery monomer.
Example 2:
in this embodiment, consistency screening is performed on 100 battery cells, which includes the following steps:
s1: carrying out formation treatment on 100 battery monomers subjected to liquid injection and sealing on a formation cabinet by using a small current, and standing for 8 hours at normal temperature after formation is finished so as to improve the stability of the battery monomers; inspecting the cover plate and the shell of the battery monomer after standing at normal temperature, and removing 2 battery monomers with leakage;
s2: placing 98 qualified battery monomers at the temperature of 60 ℃ for standing for 48 hours;
s3: 98 battery monomers after high-temperature placement are connected in series to form a battery pack and placed for 8 minutes at 25 ℃;
s4: performing 1C constant current discharging and charging operation on each battery monomer in the battery pack at the temperature of 25 ℃; simultaneously detecting the temperature change of each battery monomer in the discharging and charging processes, drawing a dynamic temperature distribution diagram of each battery monomer according to the temperature detection result, and removing 3 outlier battery monomers;
the constant current discharge is to discharge a plurality of battery monomers to any battery monomer with constant current until the voltage of any battery monomer reaches a preset discharge cut-off voltage of 2.0V, and the battery monomers are left for 8 minutes;
namely, when the voltage of a certain battery cell reaches the preset discharge voltage and is cut to 2.0V, the circuit is interrupted, the discharge process is stopped, and the battery cell is placed for 8 minutes, so that each battery cell adapts to the environment after discharging, and the influence caused by the voltage change in the charging process is avoided.
In the constant current charging, a plurality of battery monomers 1C are subjected to constant current charging until the voltage of any battery monomer reaches a preset charging cut-off voltage of 3.5V, and the battery monomers are left for 8 minutes;
namely, when the voltage of a certain battery monomer reaches the preset charge cut-off voltage of 3.5V, the charging operation is stopped, and the battery monomer is kept for 8 minutes, so that the internal state of the battery monomer gradually reaches a steady state, and the influence caused by voltage change in the subsequent discharging process is avoided.
S5: performing 1C constant current repeated discharging and charging on each battery monomer in the battery pack, and simultaneously performing voltage detection;
s6: and drawing a dynamic voltage distribution diagram of each battery monomer according to the voltage detection result, comparing and analyzing the dynamic voltage distribution diagrams of the plurality of battery monomers, screening 5 battery monomers which are clustered, and finally leaving 90 battery monomers with consistent performance to form a battery pack for use.
In the embodiment, the batteries are connected in series to form the battery pack and then operated at 20-30 ℃, so that the influence on the performance of the battery cells caused by the temperature change is prevented, and the inaccuracy of detection is avoided.
In the present embodiment, the constant current discharging and charging operations are detected by using the charging and discharging device, wherein the charging and discharging device is connected in series with all the battery cells, and can simultaneously perform the discharging and charging operations on all the battery cells. And then is connected with the charging and discharging equipment through a control machine so as to control the voltage in the charging and discharging process. The control machine is connected with the plurality of battery monomers to detect the voltage of each battery monomer in the charging and discharging process, so that the battery monomers with voltage distribution outliers are screened out according to the voltage detection result, the battery monomers are poor in consistency, and the battery monomers need to be removed from the battery pack, so that the voltage consistency of the battery pack is effectively improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A screening method for lithium battery consistency is characterized in that: the method comprises the following steps:
s1: placing the battery monomer subjected to the formation treatment at a high temperature;
s2: connecting a plurality of battery monomers after high-temperature placement in series to form a battery pack, and placing at t1 at a preset temperature;
s3: performing constant-current discharging and charging operation on each battery monomer in the battery pack at a preset temperature; simultaneously detecting the temperature change of each battery monomer in the discharging and charging processes, drawing a dynamic temperature distribution diagram of each battery monomer according to the temperature detection result, and removing the outlier battery monomer;
s4: performing constant-current discharging and charging on each battery monomer in the battery pack again, and simultaneously performing voltage detection;
s5: and drawing a dynamic voltage distribution diagram of each battery monomer according to the voltage detection result, comparing and analyzing the dynamic voltage distribution diagrams of the plurality of battery monomers, and screening the outlier battery monomer.
2. The screening method for lithium battery consistency according to claim 1, characterized in that: in step S1, the cover plate and the housing of the battery cell are inspected after the formation is finished, and the battery cell with leakage is removed.
3. The screening method for lithium battery consistency according to claim 1, characterized in that: and step S1, standing the battery monomer after the liquid injection and sealing at normal temperature for 6-10h after the formation treatment.
4. The screening method for lithium battery consistency according to claim 1, characterized in that: the high-temperature shelf life is 40-60 h at 45-60 ℃.
5. The screening method for lithium battery consistency according to claim 1, characterized in that: the preset temperatures in the steps S2 and S3 are both 20-30 ℃, and the current for constant current discharging and charging is 1-3 ℃.
6. The screening method for lithium battery consistency according to claim 1, characterized in that: in the step S3, the constant current discharging is to discharge the plurality of battery cells to a preset discharge cut-off voltage when the voltage of any battery cell reaches the preset discharge cut-off voltage, and the t2 is set aside;
and in the constant current charging, the plurality of battery cells are subjected to constant current charging until the voltage of any battery cell reaches a preset charging cut-off voltage, and t3 is set aside.
7. The screening method for lithium battery consistency according to claim 6, characterized in that: the time of t1, t2 and t3 is equal and is 8-10 minutes.
8. The screening method for lithium battery consistency according to claim 6, characterized in that: the preset discharge cut-off voltage is 2.0V-3.0V, and the preset charge cut-off voltage is 3.5V-4.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110687479.0A CN113369177A (en) | 2021-06-21 | 2021-06-21 | Screening method for lithium battery consistency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110687479.0A CN113369177A (en) | 2021-06-21 | 2021-06-21 | Screening method for lithium battery consistency |
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| CN113369177A true CN113369177A (en) | 2021-09-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047444A (en) * | 2021-11-09 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Storage battery health condition evaluation method and device |
| CN114487018A (en) * | 2022-01-05 | 2022-05-13 | 惠州亿纬集能有限公司 | Method for detecting foil breakage at welding position of lithium battery cell |
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2021
- 2021-06-21 CN CN202110687479.0A patent/CN113369177A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047444A (en) * | 2021-11-09 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Storage battery health condition evaluation method and device |
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Application publication date: 20210910 |