CN114204126B - Penetrating type baking method for lithium ion battery - Google Patents
Penetrating type baking method for lithium ion battery Download PDFInfo
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- CN114204126B CN114204126B CN202111328625.7A CN202111328625A CN114204126B CN 114204126 B CN114204126 B CN 114204126B CN 202111328625 A CN202111328625 A CN 202111328625A CN 114204126 B CN114204126 B CN 114204126B
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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 27
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 17
- 230000000149 penetrating effect Effects 0.000 title description 2
- 238000007789 sealing Methods 0.000 claims abstract description 70
- 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 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000005538 encapsulation Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 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
- 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
- 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
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001989 lithium alloy 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
- 238000004806 packaging method and process 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
- H01M10/05—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
Landscapes
- 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 transparent baking method for a lithium ion battery, which relates to the technical field of battery processing and comprises the steps of manufacturing two groups of unsealed upper and lower sealing cutters of a side sealing machine, and assembling the sealing cutters with the side sealing machine; performing top sealing on the battery cell, performing side sealing on the battery cell by using a side sealing machine in the first step, and loading the battery cell into a bearing tool after testing; the battery cell enters an oven for preheating, and the battery cell is preheated to the baking temperature of the battery cell; 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; cooling the battery cell by circulating dry nitrogen; and (3) testing the moisture of the battery cell, and after the moisture content is qualified, performing sealing and sealing on the edge sealing of the battery cell, and then performing the liquid injection procedure. In the process of vacuumizing and nitrogen filling, the battery cell is provided with the side edge sealing and opening and the air vents on the upper side and the lower side of the air bag, and in the process of vacuumizing and nitrogen filling in the vacuum oven, an upper air channel and a lower air channel can be provided.
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 positive/negative electrode material, manganese dioxide as positive electrode material, metallic lithium or alloy metal thereof as negative electrode material and nonaqueous electrolyte solution, and in different material systems, the moisture content has great influence on the first discharge capacity of the battery, the quality, internal resistance, circulation and other performances of SE I film, so that the baking before the battery core is injected is an indispensable important process, the moisture content in the battery core is required to be reduced as much as possible, and in the production and manufacturing process of the soft package lithium ion battery, the baking for a long time is required to be carried out after the top side sealing of the battery core is completed before the injection, so that the moisture in the battery core is reduced to reach a certain requirement.
Through searching, chinese patent discloses a high-efficiency lithium ion battery coil baking method (publication No. CN 112595035A), which comprises the following baking steps: s1, placing a material box with a winding core in a vacuum oven, vacuumizing, standing for a plurality of minutes, then charging nitrogen to normal pressure, preheating according to a set temperature and time, wherein the vacuum value is L0, and the nitrogen pressure value is P0; s2, performing first cyclic baking on the winding core in the step S1, and baking for a certain time under a vacuum value L1; then filling nitrogen and baking for a certain time under the condition that the pressure value of the nitrogen is P1; the above steps were cycled N1 times.
The existing technology has the disadvantages of overlong baking time, low production efficiency, high energy consumption and high production cost. In addition, the soft package battery core only discharges water through the unilateral outlet of the air bag in the baking process, once the high vacuum inside the battery core and the air bag are closed, the water cannot be discharged from the inside of the battery core, and high potential safety hazards are caused.
Disclosure of Invention
The invention aims to provide a transparent baking method for a lithium ion battery, which solves the following technical problems:
how to quickly and effectively reduce the water content in the battery cell, thereby effectively controlling the manufacturing cost of the battery cell and improving the performance of the battery cell.
The aim of the invention can be achieved by the following technical scheme:
a through type baking method of a lithium ion battery comprises the following steps:
step one: manufacturing two groups of unsealed upper and lower sealing cutters of the side sealing machine, and assembling the sealing cutters with the side sealing machine;
step two: performing top sealing on the battery cell, performing side sealing on the battery cell by using a side sealing machine in the first step, and loading the battery cell into a bearing tool after testing;
step three: the battery cell enters an oven for preheating, and the battery cell is preheated to the baking temperature of the battery cell;
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 fourth step for 5-30 times;
step six: cooling the battery cell by circulating dry nitrogen;
step seven: and (3) testing the moisture of the battery cell, and after the moisture content is qualified, performing sealing and sealing on the edge sealing of the battery cell, and then performing the liquid injection procedure.
As a further scheme of the invention: the baking temperature in the third step is 80-100 ℃.
As a further scheme of the invention: and in the fourth step, the vacuum state is-99 to-90 KPa.
As a further scheme of the invention: and in the fourth step, after the inside of the oven reaches the normal pressure state, the normal pressure state is kept for 2-15min.
As a further scheme of the invention: the temperature of the cooling treatment in the step six is 40-50 ℃.
As a further scheme of the invention: the test in the second step comprises an angle position seal test and a Hi-post test.
As a further scheme of the invention: the upper sealing knife and the lower sealing knife 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 respectively provided with opposite sealing head blank areas for reserving vent holes of the battery cells.
As a further scheme of the invention: the length of the seal head blank area is 17-25mm.
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 of side seal district is provided with the side seal of communicating with corresponding air bag and stays the air vent for with air bag and outside intercommunication.
As a further scheme of the invention: and in the step seven, if the moisture of the battery cell is unqualified, repeating the step four to the step six, and drying the battery cell again.
The invention has the beneficial effects that:
in the process of vacuumizing and nitrogen filling, the battery cell is provided with the side edge sealing and opening reserving holes and the air vents on the upper side and the lower side of the air bag, and in the process of vacuumizing and nitrogen filling in the vacuum oven, an upper air channel and a lower air channel can be provided, so that the air bag of the battery cell is not closed due to high vacuum in the battery cell to influence the discharge of water, and the air vents on the two sides can effectively lead nitrogen to carry away the water at a high-temperature baking position through the inside of the battery cell, thereby reducing the baking time and avoiding potential safety hazards caused by incapability of discharging the water from the inside of the battery cell;
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 is further described below 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 and lower heads of the present invention;
fig. 3 is a cross-sectional view of a cell to be baked in accordance with the present invention.
In the figure: 11. an upper end enclosure; 12. a lower end enclosure; 13. a white area is reserved on the sealing head; 21. a side seal region; 22. an air bag; 23. and a vent is reserved in a side seal mode.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the invention discloses a transparent baking method for a lithium ion battery, which comprises the following steps:
step one: two groups of unsealed upper and lower sealing cutters of the side sealing machine are manufactured, each upper sealing cutter and each lower sealing cutter respectively comprise an upper sealing head 11 and a lower sealing head 12, two opposite sealing head blank areas 13 with the length of 20mm are formed on two sides of each upper sealing head 11 and each lower sealing head 12, air vents of the battery cells are reserved, and the sealing cutters are assembled with the side sealing machine;
step two: performing top sealing on the battery cell, performing side sealing on the battery cell by using a side sealing machine in the first step, wherein an air bag 22 is arranged in the battery cell after side sealing, side sealing areas 21 are arranged on two sides of the air bag 22, side sealing air ports 23 communicated with the corresponding air bag 22 are arranged on the side surfaces of the side sealing areas 21 and are used for communicating the air bag 22 with the outside, and the battery cell is filled into a bearing tool after corner sealing and Hi-Pot testing, and preferably, the bearing tool selects a material frame;
step three: the battery core enters an oven for preheating, and the battery core is preheated to 85 ℃;
step four: pumping the oven to a vacuum state, maintaining for 20min, and then flushing dry nitrogen until the interior of the oven reaches a normal pressure state, and maintaining for 5min;
step five: repeating the operation of the fourth step for 10 times;
step six: cooling the battery cell to 45 ℃ by circulating dry nitrogen;
step seven: and (3) carrying out moisture test on the battery cell, detecting that the positive electrode of the battery cell is 192ppm, the negative electrode of the battery cell is 336ppm, the moisture content is qualified, carrying out sealing and repairing on the edge sealing of the battery cell, and then carrying out the liquid injection procedure.
The heating time of this example was 2 hours, the circulation time was 5 hours, the cooling time was 2 hours, and the total time was 9 hours.
Comparative example
1, taking side seals of normally produced soft-package lithium ion batteries, completely packaging, and heating the battery cells to 85 ℃ in an oven;
2, vacuumizing to-95 Kpa, heating in vacuum for 2 hours, and then filling nitrogen for 10 minutes.
3, sequentially circulating for 8 times, vacuumizing to below-95 Kpa, closing heating, and taking the electric core out of the oven when the vacuum oven is cooled to below 45 ℃.
Total time consumption: heating for 2h, circulating for 9.5h, cooling for 2h, and total consumption time for 13.5h.
After the battery cell is discharged from the oven, testing the moisture of the battery cell pole piece, wherein the test result is as follows: 185ppm of positive electrode plate and 352ppm of negative electrode plate; meanwhile, 2% of the battery cells cannot completely drain the internal water due to the closed air bags 22, and the test results are that: anode plate 277ppm and cathode plate 534ppm.
Conclusion of the comparison
The results of the examples and comparative examples show that: the method provides a baking process capable of effectively improving production efficiency, and can improve the baking straight-through rate to a certain extent and improve product safety.
In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and for simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, 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; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (7)
1. The permeable baking method for the lithium ion battery is characterized by comprising the following steps of:
step one: manufacturing two groups of unsealed upper and lower sealing cutters of the side sealing machine, and assembling the sealing cutters with the side sealing machine;
step two: performing top sealing on the battery cell, performing side sealing on the battery cell by using a side sealing machine in the first step, and loading the battery cell into a bearing tool after testing;
step three: the battery cell enters an oven for preheating, and the battery cell is preheated to the baking temperature of the battery cell;
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 fourth step for 5-30 times;
step six: cooling the battery cell by circulating dry nitrogen;
step seven: performing moisture test on the battery cell, repairing and sealing the edge of the battery cell when the moisture content is qualified, and performing a liquid injection procedure;
the upper sealing knife and the lower sealing knife in the first step respectively comprise an upper sealing head (11) and a lower sealing head (12), and two opposite sealing head blank areas (13) are respectively arranged on two sides of the upper sealing head (11) and the lower sealing head (12) and are used for reserving vent holes of the battery cells;
the battery cell after side encapsulation in the second step is internally provided with an air bag (22), both sides of the air bag (22) are provided with side sealing areas (21), and the side surfaces of the side sealing areas (21) are provided with side sealing air vents (23) communicated with the corresponding air bags (22).
2. The through-type baking method for lithium ion batteries according to claim 1, wherein the baking temperature in the third step is 80-100 ℃.
3. 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.
4. The permeable baking method for lithium ion batteries according to claim 3, wherein the oven in the fourth step is kept at normal pressure for 2-15min after reaching the normal pressure.
5. The through-type baking method for lithium ion batteries according to claim 1, wherein the temperature of the cooling treatment in the step six is 40-50 ℃.
6. The through-type baking method for lithium ion batteries according to claim 1, wherein the test in the second step comprises an angular seal and a Hi-post test.
7. The through-type baking method of the lithium ion battery according to claim 1, wherein the length of the seal head blank area (13) is 17-25mm.
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 CN114204126A (en) | 2022-03-18 |
| CN114204126B true CN114204126B (en) | 2024-03-29 |
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