CN113675488A - Rapid formation method - Google Patents
Rapid formation method Download PDFInfo
- Publication number
- CN113675488A CN113675488A CN202110718515.5A CN202110718515A CN113675488A CN 113675488 A CN113675488 A CN 113675488A CN 202110718515 A CN202110718515 A CN 202110718515A CN 113675488 A CN113675488 A CN 113675488A
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- China
- Prior art keywords
- formation
- charging
- clamping
- clamping force
- battery cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007600 charging Methods 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000741 silica gel Substances 0.000 abstract description 10
- 229910002027 silica gel Inorganic materials 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000002791 soaking Methods 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 description 7
- 230000008595 infiltration Effects 0.000 description 7
- 238000001764 infiltration Methods 0.000 description 7
- 238000010277 constant-current charging Methods 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
-
- 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
Landscapes
- 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)
Abstract
The invention discloses a rapid formation method, and belongs to the technical field of battery cell manufacturing. The rapid formation method comprises the following steps: s1, pressurizing the battery cell by controlling the clamping speed of two side plates of the battery cell; s2, pressurizing to a clamping force critical value D1 for first formation charging, pressurizing to a clamping force critical value D2 for second formation charging, and reducing the pressure to a clamping force critical value D3 for third formation charging; and S3, finishing charging, and releasing the battery cell. And silica gel layers are arranged on the inner sides of the two side plates for clamping the battery cell. According to the invention, the silica gel layer wraps and clamps the battery cell, so that the deformation of the battery cell is reduced, and the hardness of the battery cell is improved; the charging current is increased by stages, so that the formation time is shortened; the pole piece soaking effect is improved by the step pressurization.
Description
Technical Field
The invention belongs to the technical field of cell manufacturing, and relates to a rapid formation method.
Background
In the current manufacturing process of the polymer battery cell, formation is a key process, and the battery cell is activated through a formation process, so that the performance of the battery cell is directly influenced. The current formation current is 0.1-0.7C, the charging time is more than 90min for full formation, the production efficiency is influenced, and the production period is long. The polymer battery cell is of a winding structure, the position of a tab of the polymer battery cell relative to a non-tab of the polymer battery cell has thickness difference, the battery cell is stressed unevenly, and the hardness of the battery cell is poor. At present, the energy density of a battery core is higher, so that the pole piece infiltration effect cannot be ensured.
The existing cell manufacturing process mainly has the following problems: long formation time, poor cell hardness and poor infiltration effect.
Disclosure of Invention
The invention aims to provide a method for rapid formation, aiming at the problems in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a rapid formation method comprises the following steps:
s1, pressurizing the battery cell by controlling the clamping speed of two side plates of the battery cell;
s2, pressurizing to a clamping force critical value D1 for first formation charging, pressurizing to a clamping force critical value D2 for second formation charging, and reducing the pressure to a clamping force critical value D3 for third formation charging;
and S3, finishing charging, and releasing the battery cell.
Preferably, the charging time of the first formation charging, the second formation charging and the third formation charging are different.
Preferably, the current of the first formation charge is lower than the current of the second formation charge and the current of the third formation charge.
Preferably, the clamping force threshold D1 and the clamping force threshold D3 are both lower than the clamping force threshold D2.
Preferably, the critical clamping force value D1 is 3-10kgf/mm2The critical value D2 of clamping force is 8-20kgf/mm2The critical value D3 of clamping force is 3-10kgf/mm2。
And adjusting the specifically required cell clamping force according to the areas of different products, wherein the cell clamping force is the product of the surface pressure and the cell area and is divided by 9.8.
Further preferably, the clamping force threshold D1 is the same as the clamping force threshold D3.
Preferably, the formation current in the first formation charging is 0.1-0.5C, the charging time is 10-20min, and the formation charging voltage is 3.5-3.8V.
Preferably, the formation current in the second formation charging is 1.0-1.8 ℃, the charging time is 25-45min, and the formation charging voltage is 3.8-4.2V.
Preferably, the formation current in the third formation charging is 1.0-1.8 ℃, the charging time is 5-16min, and the formation charging voltage is 4.2-4.6V.
Preferably, in the clamping process, the clamping speed V1 of the two side plates of the battery cell is firstly increased to 180-220kg, and then the clamping speed V2 is increased to the clamping force critical value D1, the clamping force critical value D1 is greater than 220kg, and the clamping speed V1 is less than the clamping speed V2.
Preferably, the clamping speed at which the clamping force threshold D1 is increased to the clamping force threshold D2, and the clamping speed at which the clamping force threshold D2 is decreased to the clamping force threshold D3 are the same as the clamping speed V2.
Further preferably, the clamping speed V2 is 0.1-20 kg/s.
Preferably, the inner side surfaces of the two side plates clamping the battery cell are provided with silica gel layers, the inner side surfaces are contact surfaces with the battery cell, and the silica gel layers are only arranged on the inner side surfaces and can also be directly coated by the silica gel layers. The silica gel layer has a hardness of 40-80 ° and a thickness of 0.5-3 mm.
The silica gel layer is used for wrapping the battery cell and enabling the battery cell to be stressed uniformly.
More preferably, the pressurization in step S1 is heating pressurization, and the heating temperature is 75 to 85 ℃.
Preferably, the battery cell is kept stand at a high temperature of 40-70 ℃ for 20-40h in advance before formation.
Compared with the prior art, the invention has the following beneficial effects:
1. the charging current is increased in stages, and the formation time is shortened.
2. And by adopting a step pressurization mode, when the charging is carried out to a certain voltage, the clamping pressure is reduced, the charging is continued to absorb more electrolyte, and the pole piece soaking effect is improved.
3. The structure of the clamping electric core laminate is optimized, and the silica gel with certain hardness and thickness is added on the laminate to wrap the electric core, so that the electric core is stressed uniformly, and the hardness of the electric core is improved.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples. The following embodiments are all steps of performing formation on a certain cell product, and relevant values include, but are not limited to, the contents of the following embodiments. The obtained battery core is subjected to quality inspection by the standard (GB/T18287-2000).
Example 1
Taking the battery cell after standing for 24 hours at a high temperature of 50 ℃, safely putting the battery cell into formation equipment, ensuring that a battery cell main body is not exposed and a tab effectively contacts a charging circuit board; the battery core is transplanted to the formation jig, the opening equipment clamps the battery core tightly, the two side plates clamping the battery core are provided with silica gel layers with the hardness of 60 degrees and the thickness of 1.5mm, and the heating temperature of the side plates is 80 ℃. The cell is clamped at different speeds in different pressure ranges, and the cell is pressurized to 200kg at a clamping speed of 0.4kg/s and then to 235kg at a clamping speed of 12 kg/s. And sending a formation step charging process, wherein the formation current is 0.3C, the constant current charging time is 15min, and the charging voltage is 3.5V. And charging the clamp pressure to a preset pressure of 590kg for 26min by a formation current of 1.7C. After the formation voltage is reduced to 4.0V, the clamping pressure is reduced to 235kg, and the glass is charged with the formation current of 1.7C for 10min until the voltage is 4.5V. And opening the clamp after the operation is finished, and taking out the battery core. And (3) displaying a cell performance test result: the performance reaches 91.3 percent and is higher than 80 percent of the target after being cycled for 800 times at normal temperature, and the performance reaches 86.4 percent and is higher than 60 percent of the target after being cycled for 500 times at 45 ℃; the cell deformation is 0.054mm, and the integral hardness is good; the electrolyte retention amount is 6.14g, and the infiltration effect is good.
Example 2
Compared with the embodiment 1, when the clamping pressure is 236kg, the step charging step is sent, the formation current is 0.4C, the constant current charging time is 10min, and the formation voltage is 3.6V. When the clamping pressure is 560kg, the formation current is 1.6C, the charging time is 25min, and the formation voltage is 3.9V. When the pressure is 236kg, the formation current is 1.5C, the constant current charging time is 7min, and the formation voltage is 4.3V. And (3) displaying a cell performance test result: the performance reaches 90.1 percent and is higher than 80 percent of the target after 800 times of circulation at normal temperature, and reaches 84.6 percent and is higher than 60 percent of the target after 500 times of circulation at 45 ℃; the cell deformation is 0.048mm, and the overall hardness is good; the electrolyte retention amount is 6.19g, and the infiltration effect is good.
Example 3
Compared with the embodiment 1, when the clamping pressure is 240kg, the step charging step is sent, the formation current is 0.5C, the constant current charging time is 12min, and the formation voltage is 3.7V. When the clamping pressure is 590kg, the formation current is 1.6C, the charging time is 30min, and the formation voltage is 4.1V. When the pressure is 240kg, the formation current is 1.7C, the constant current charging time is 14min, and the formation voltage is 4.4V. And (3) displaying a cell performance test result: the performance reaches 90.0 percent and is higher than 80 percent of the target after 800 times of circulation at normal temperature, and reaches 84.3 percent and is higher than 60 percent of the target after 500 times of circulation at 45 ℃; the deformation of the battery core is 0.0486mm, and the integral hardness is good; the electrolyte retention amount is 6.16g, and the infiltration effect is good.
Comparative example 1
Compared with the embodiment 1, the two side plates of the clamping battery core are common metal aluminum plates. And (3) displaying a cell performance test result: the performance reaches 83.6 percent after being cycled for 800 times at normal temperature, and reaches 72.2 percent after being cycled for 500 times at 45 ℃; the cell deformation is 0.23mm, and the cell edge, head and tail parts are relatively obviously softened; the electrolyte retention amount is 6.11g, and the infiltration effect is good.
Comparative example 2
The formation current was constant as compared with example 1. The constant formation current is 1.2C, and the constant current charging time is 150 min. And (3) displaying a cell performance test result: the performance reaches 73.1 percent after being cycled for 800 times at normal temperature, and 56.2 percent after being cycled for 500 times at 45 ℃; the cell deformation is 0.056mm, and the integral hardness is good; the electrolyte retention amount is 6.15g, and the infiltration effect is good; however, the formation time is long, which affects the production efficiency, deteriorates the cycle effect, and increases the manufacturing cost.
Comparative example 3
In comparison with example 1, the cell was pressed to the desired 600kg at a clamping speed of 10kg/s and was held at this pressure until the end of the formation process. And (3) displaying a cell performance test result: the performance reaches 84.5 percent after being cycled for 800 times at normal temperature, and reaches 73.6 percent after being cycled for 500 times at 45 ℃; the cell deformation is 0.053mm, and the integral hardness is good; the electrolyte retention amount was 5.83g, and the impregnation effect was poor.
In conclusion, the battery cell is wrapped and clamped by the silica gel layer, so that the deformation of the battery cell is reduced, and the hardness of the battery cell is improved; the charging current is increased by stages, so that the formation time is shortened; the pole piece soaking effect is improved by the step pressurization.
The technical scope of the invention claimed by the embodiments of the present application is not exhaustive, and new technical solutions formed by equivalent replacement of single or multiple technical features in the technical solutions of the embodiments are also within the scope of the invention claimed by the present application; in all the embodiments of the present invention, which are listed or not listed, each parameter in the same embodiment only represents an example (i.e., a feasible embodiment) of the technical solution, and there is no strict matching and limiting relationship between the parameters, wherein the parameters may be replaced with each other without departing from the axiom and the requirements of the present invention, unless otherwise specified.
Claims (10)
1. A rapid formation method is characterized by comprising the following steps:
s1, pressurizing the battery cell by controlling the clamping speed of two side plates of the battery cell;
s2, pressurizing to a clamping force critical value D1 for first formation charging, pressurizing to a clamping force critical value D2 for second formation charging, and reducing the pressure to a clamping force critical value D3 for third formation charging;
s3, releasing the battery cell after charging is finished;
the charging time of the first formation charging, the second formation charging and the third formation charging are different;
the current of the first formation charging is lower than the current of the second formation charging and the current of the third formation charging;
the clamping force threshold values D1 and D3 are both lower than the clamping force threshold value D2.
2. The method of claim 1 wherein said threshold clamping force value D1 is 3-10kgf/mm2The critical value D2 of clamping force is 8-20kgf/mm2The critical value D3 of clamping force is 3-10kgf/mm2。
3. The method according to claim 1, wherein the formation current in the first formation charging is 0.1-0.5C, the charging time is 10-20min, and the formation charging voltage is 3.5-3.8V.
4. The method according to claim 1, wherein the formation current in the second formation charging is 1.0-1.8C, the charging time is 25-45min, and the formation charging voltage is 3.8-4.2V.
5. The method according to claim 1, wherein the formation current in the third formation charge is 1.0-1.8C, the charging time is 5-16min, and the formation charge voltage is 4.2-4.6V.
6. The method as claimed in claim 1, wherein during the clamping process, the clamping speed V1 of the two side plates of the cell is first increased to 180-220kg, and then the clamping speed V2 is increased to the clamping force threshold value D1, wherein the clamping force threshold value D1 is greater than 220kg, and the clamping speed V1 is less than the clamping speed V2.
7. The method of claim 1 wherein the clamping speed at which the clamping force threshold D1 is increased to the clamping force threshold D2 and the clamping speed at which the clamping force threshold D2 is decreased to the clamping force threshold D3 are the same as the clamping speed V2.
8. A method according to claim 6 or 7, characterized in that the clamping speed V2 is 0.1-20 kg/s.
9. The method according to claim 1, wherein the inner sides of the two side plates of the clamping cell are provided with a silicone layer.
10. The method according to claim 1, wherein the pressurizing of step S1 is heating and pressurizing, and the heating temperature is 75-85 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110718515.5A CN113675488A (en) | 2021-06-28 | 2021-06-28 | Rapid formation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110718515.5A CN113675488A (en) | 2021-06-28 | 2021-06-28 | Rapid formation method |
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| CN113675488A true CN113675488A (en) | 2021-11-19 |
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| CN202110718515.5A Pending CN113675488A (en) | 2021-06-28 | 2021-06-28 | Rapid formation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597499A (en) * | 2022-02-25 | 2022-06-07 | 惠州锂威新能源科技有限公司 | Formation method and preparation method of lithium ion battery and lithium ion battery |
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-
2021
- 2021-06-28 CN CN202110718515.5A patent/CN113675488A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107403945A (en) * | 2016-05-18 | 2017-11-28 | 万向二三股份公司 | A kind of soft package lithium ion power battery is melted into rolling method |
| CN107579302A (en) * | 2017-10-13 | 2018-01-12 | 骆驼集团新能源电池有限公司 | A kind of Soft Roll lithium ion power battery core rapid forming method |
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Application publication date: 20211119 |