CN114204126A - Permeable baking method for lithium ion battery - Google Patents
Permeable baking method for lithium ion battery Download PDFInfo
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- CN114204126A CN114204126A CN202111328625.7A CN202111328625A CN114204126A CN 114204126 A CN114204126 A CN 114204126A CN 202111328625 A CN202111328625 A CN 202111328625A CN 114204126 A CN114204126 A CN 114204126A
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- Prior art keywords
- battery cell
- sealing
- lithium ion
- battery
- oven
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- 238000000034 method Methods 0.000 title claims abstract description 29
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 230000001502 supplementing effect Effects 0.000 claims abstract description 3
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
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
- H01M10/05—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
-
- 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 permeable baking method of a lithium ion battery, which relates to the technical field of battery processing and comprises the steps of manufacturing two groups of non-closed upper sealing cutters and non-closed lower sealing cutters of a side sealing machine, and assembling the sealing cutters and the side sealing machine; carrying out top sealing on the battery cell, then carrying out side sealing on the battery cell by using the side sealing machine in the step one, and loading the battery cell into a bearing tool after testing; the battery cell enters an oven to be preheated and is preheated to the battery cell baking temperature; pumping the oven to a vacuum state, keeping the vacuum state for 10-30min, and then flushing dry nitrogen until the interior of the oven reaches a normal pressure state; circularly drying nitrogen to cool the battery cell; and (4) testing the moisture of the battery cell, supplementing and sealing the edge sealing of the battery cell when the moisture content is qualified, and then injecting liquid. In the process of vacuumizing and filling nitrogen, the battery core is provided with a side sealing edge remaining opening and air vents at the upper side and the lower side of the air bag, and an upper air channel and a lower air channel can be provided in the process of vacuumizing and filling nitrogen in the vacuum oven.
Description
Technical Field
The invention relates to the technical field of battery processing, in particular to a permeable baking method for a lithium ion battery.
Background
The lithium battery is a battery which uses lithium metal or lithium alloy as a positive/negative electrode material, generally uses manganese dioxide as a positive electrode material, uses metal lithium or alloy metal thereof as a negative electrode material, and uses a non-aqueous electrolyte solution, and in different material systems, the moisture content has great influence on the first discharge capacity of the battery, the quality of an SE I film, the internal resistance, the circulation and other properties, so that the baking before the liquid injection of the battery cell is taken as an indispensable important process, and the moisture content in the battery cell is required to be reduced as much as possible.
Through search, Chinese patent discloses a high-efficiency baking method for a lithium ion battery winding core (publication number: CN112595035A), which comprises the following baking steps: s1, placing the material box with the roll cores in a vacuum oven, vacuumizing, standing for a plurality of minutes, filling nitrogen to normal pressure, and preheating according to set temperature and time, wherein the vacuum value is L0, and the nitrogen pressure value is P0; s2, carrying out first-time circulating baking on the winding core in the S1, and baking for a certain time under a vacuum value L1; then filling nitrogen, and baking for a certain time at the nitrogen pressure value of P1; the above steps are circulated for N1 times.
The existing process has the disadvantages of overlong baking time, low production efficiency, high energy consumption and high production cost. Moreover, the moisture in the flexible package battery cell is discharged only through the unilateral outlet of the air bag in the baking process, and once the battery cell is high in vacuum and the air bag is closed, the moisture can not be discharged from the interior of the battery cell, so that high potential safety hazard is caused.
Disclosure of Invention
The invention aims to provide a permeable baking method of a lithium ion battery, which solves the following technical problems:
how to rapidly and effectively reduce the water content in the battery cell, and then effectively control the manufacturing cost of the battery cell, and can improve the performance of the battery cell.
The purpose of the invention can be realized by the following technical scheme:
a permeable baking method of a lithium ion battery comprises the following steps:
the method comprises the following steps: manufacturing two groups of non-closed upper and lower sealing knives of the side sealing machine, and assembling the sealing knives and the side sealing machine;
step two: carrying out top sealing on the battery cell, then carrying out side sealing on the battery cell by using the side sealing machine in the step one, and loading the battery cell into a bearing tool after testing;
step three: the battery cell enters an oven to be preheated and is preheated to the battery cell baking temperature;
step four: pumping the oven to a vacuum state, keeping the vacuum state for 10-30min, and then flushing dry nitrogen until the interior of the oven reaches a normal pressure state;
step five: repeating the operation of the step four for 5-30 times;
step six: circularly drying nitrogen to cool the battery cell;
step seven: and (4) testing the moisture of the battery cell, supplementing and sealing the edge sealing of the battery cell when the moisture content is qualified, and then injecting liquid.
As a further scheme of the invention: the baking temperature in the third step is 80-100 ℃.
As a further scheme of the invention: the vacuum state in the fourth step is-99 to-90 KPa.
As a further scheme of the invention: and in the fourth step, after the interior of the oven reaches the normal pressure state, the normal pressure state is kept for 2-15 min.
As a further scheme of the invention: and the temperature of the temperature reduction treatment in the sixth step is 40-50 ℃.
As a further scheme of the invention: and the test in the second step comprises an angle position sealing test and a Hi-Pot test.
As a further scheme of the invention: the upper sealing cutter and the lower sealing cutter respectively comprise an upper sealing head and a lower sealing head, and two sides of the upper sealing head and the lower sealing head are provided with opposite sealing head whitening areas for reserving air vents of the battery core.
As a further scheme of the invention: the length of the seal head blank area is 17-25 mm.
As a further scheme of the invention: the inside of electricity core is provided with the air bag, the both sides of air bag all are provided with the side seal district, the side in side seal district is provided with and leaves the blow vent with the side seal that corresponds the air bag intercommunication for with air bag and outside intercommunication.
As a further scheme of the invention: and in the seventh step, if the battery core is unqualified in moisture, repeating the fourth step and the sixth step, and drying the battery core again.
The invention has the beneficial effects that:
in the processes of vacuumizing and filling nitrogen, the battery core is provided with a side sealing edge remaining port and air vents at the upper side and the lower side of the air bag, an upper air channel and a lower air channel can be provided in the vacuum oven in the processes of vacuumizing and filling nitrogen, so that the moisture discharge is not influenced by the fact that the air bag of the battery core is closed due to high vacuum in the battery core, and the nitrogen can effectively take away the moisture at a high-temperature baking position through the air vents at the two sides, so that the baking time is reduced, and the potential safety hazard caused by the fact that the moisture cannot be discharged from the interior of the battery core is avoided;
the invention can quickly and effectively reduce the water content in the battery cell, thereby effectively reducing the manufacturing cost of the battery cell and improving the performance of the battery cell.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a partial cross-sectional view of the upper head and the lower head of the present invention;
fig. 3 is a cross-sectional view of a cell to be baked in the present invention.
In the figure: 11. an upper end enclosure; 12. a lower end enclosure; 13. a seal head white area is reserved; 21. a side sealing area; 22. an air bag; 23. the vent is sealed on the side.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention is a permeable baking method for lithium ion batteries, comprising the following steps:
the method comprises the following steps: manufacturing two groups of non-closed upper sealing knives and non-closed lower sealing knives of a side sealing machine, wherein the upper sealing knives and the lower sealing knives respectively comprise an upper end enclosure 11 and a lower end enclosure 12, and end enclosure white reserving areas 13 which are opposite and 20mm long are arranged on two sides of the upper end enclosure 11 and two sides of the lower end enclosure 12 and are used for reserving air vents of a battery cell and assembling the sealing knives and the side sealing machine;
step two: carrying out top sealing on the battery cell, then carrying out side sealing on the battery cell by using a side sealing machine in the first step, arranging an air bag 22 in the battery cell after side sealing, arranging side sealing areas 21 on both sides of the air bag 22, arranging a side sealing remaining air vent 23 communicated with the corresponding air bag 22 on the side surface of each side sealing area 21, communicating the air bag 22 with the outside, and loading the battery cell into a carrying tool after corner sealing and Hi-Pot testing, wherein preferably, the carrying tool is a material frame;
step three: the battery core enters an oven to be preheated to 85 ℃;
step four: pumping the oven to a vacuum state, keeping the vacuum state for 20min, then flushing dry nitrogen until the interior of the oven reaches a normal pressure state, and keeping the pressure for 5 min;
step five: repeating the operation of the step four for 10 times;
step six: circulating dry nitrogen to cool the battery cell to 45 ℃;
step seven: and (3) testing the moisture of the battery cell, detecting that the positive pole of the battery cell is 192ppm, the negative pole of the battery cell is 336ppm, and the moisture content is qualified, sealing the edge of the battery cell, and injecting liquid.
In the embodiment, the heating time is 2 hours, the circulation time is 5 hours, the cooling time is 2 hours, and the total time is 9 hours.
Comparative example
1, completely packaging the side seal of a normally produced soft package lithium ion battery, and heating the battery cell to 85 ℃ in an oven;
2, vacuumizing to-95 Kpa, heating in vacuum for 2h, and then filling nitrogen for 10 min.
And 3, sequentially circulating for 8 times, vacuumizing to below-95 Kpa, closing heating, and taking the battery cell out of the oven after the temperature of the vacuum oven is reduced to below 45 ℃.
Total time consumption: heating for 2h, circulating for 9.5h, cooling for 2h, and totally consuming for 13.5 h.
The moisture of electric core pole piece is tested after electric core goes out the oven, and the test result is: 185ppm of positive plate and 352ppm of negative plate; meanwhile, 2% of electric cores cannot completely discharge internal moisture due to the closed air bag 22, and the test result is as follows: 277ppm of positive plate and 534ppm of negative plate.
Comparison conclusion
The results of the examples and comparative examples show that: the method provides a baking process which can effectively improve the production efficiency, and can improve the first pass rate of baking to a certain extent and improve the product safety.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A permeable baking method of a lithium ion battery is characterized by comprising the following steps:
the method comprises the following steps: manufacturing two groups of non-closed upper and lower sealing knives of the side sealing machine, and assembling the sealing knives and the side sealing machine;
step two: carrying out top sealing on the battery cell, then carrying out side sealing on the battery cell by using the side sealing machine in the step one, and loading the battery cell into a bearing tool after testing;
step three: the battery cell enters an oven to be preheated and is preheated to the battery cell baking temperature;
step four: pumping the oven to a vacuum state, keeping the vacuum state for 10-30min, and then flushing dry nitrogen until the interior of the oven reaches a normal pressure state;
step five: repeating the operation of the step four for 5-30 times;
step six: circularly drying nitrogen to cool the battery cell;
step seven: and (4) testing the moisture of the battery cell, supplementing and sealing the edge sealing of the battery cell when the moisture content is qualified, and then injecting liquid.
2. The permeable baking method of the lithium ion battery according to claim 1, wherein the upper sealing knife and the lower sealing knife in the first step respectively comprise an upper end enclosure (11) and a lower end enclosure (12), and opposite end enclosure white leaving areas (13) are respectively arranged on two sides of the upper end enclosure (11) and the lower end enclosure (12) and used for reserving air vents of the battery cells.
3. The through-baking method for lithium ion batteries according to claim 1, wherein the baking temperature in the third step is 80-100 ℃.
4. The permeable baking method for lithium ion batteries according to claim 1, wherein the vacuum state in the fourth step is-99 to-90 KPa.
5. The lithium ion battery permeable baking method according to claim 4, wherein the normal pressure state is maintained for 2-15min after the inside of the oven in the fourth step reaches the normal pressure state.
6. The lithium ion battery through baking method according to claim 1, wherein the temperature of the temperature reduction treatment in the sixth step is 40-50 ℃.
7. The through-baking method for lithium ion batteries according to claim 1, wherein the testing in step two comprises corner sealing and H i-Pot testing.
8. The through baking method of a lithium ion battery according to claim 2, wherein the length of the head blank region (13) is 17-25 mm.
9. The through baking method of the lithium ion battery according to claim 1, wherein an air bag (22) is arranged inside the battery cell after side packaging in the second step, side sealing regions (21) are arranged on both sides of the air bag (22), and side sealing air vents (23) communicated with the corresponding air bag (22) are arranged on the side surfaces of the side sealing regions (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328625.7A CN114204126B (en) | 2021-11-10 | 2021-11-10 | Penetrating type baking method for lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328625.7A CN114204126B (en) | 2021-11-10 | 2021-11-10 | Penetrating type baking method for lithium ion battery |
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| CN114204126A true CN114204126A (en) | 2022-03-18 |
| CN114204126B CN114204126B (en) | 2024-03-29 |
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