CN113659258A - Upper end socket and lower end socket for Degas packaging and method for improving Degas packaging reliability by using upper end socket and lower end socket - Google Patents
Upper end socket and lower end socket for Degas packaging and method for improving Degas packaging reliability by using upper end socket and lower end socket Download PDFInfo
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- CN113659258A CN113659258A CN202110703229.1A CN202110703229A CN113659258A CN 113659258 A CN113659258 A CN 113659258A CN 202110703229 A CN202110703229 A CN 202110703229A CN 113659258 A CN113659258 A CN 113659258A
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- packaging
- head
- end socket
- degas
- shaped
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 239000003792 electrolyte Substances 0.000 claims abstract description 16
- 239000007779 soft material Substances 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000012858 packaging process Methods 0.000 claims abstract description 3
- 238000003825 pressing Methods 0.000 claims description 17
- 239000002985 plastic film Substances 0.000 claims description 9
- 229920006255 plastic film Polymers 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 239000000741 silica gel Substances 0.000 description 6
- 229910002027 silica gel Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000005022 packaging material Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 3
- 229920006362 Teflon® Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 239000000499 gel Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012536 packaging technology Methods 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of battery manufacturing, and discloses an upper end socket and a lower end socket for Degas packaging, which comprise: the upper sealing head and the lower sealing head are both provided with notches, the notches of the upper sealing head are provided with mushroom-shaped heads, and the notches of the lower sealing head are provided with T-shaped heads; the mushroom-shaped head and the T-shaped head are made of soft materials. Simultaneously, the method for improving the Degas packaging reliability by using the upper end socket with the mushroom-shaped head and the lower end socket with the T-shaped head is disclosed, and comprises the following steps: and in the packaging process, the free electrolyte in the packaging area between the two layers of aluminum-plastic composite films is removed through the extrusion of the upper end enclosure and the lower end enclosure, and the Degas packaging is completed through the steps of vacuumizing, heating and pressurizing. The upper end socket with the mushroom-shaped head and the lower end socket with the T-shaped head are matched to use, so that electrolyte in a packaging area can be effectively removed, and the packaging reliability is guaranteed.
Description
Technical Field
The invention belongs to the technical field of battery manufacturing, and particularly relates to an upper end socket and a lower end socket for Degas packaging and a method for improving the Degas packaging reliability by using the upper end socket and the lower end socket.
Background
The lithium ion battery has the characteristics of diversified sizes, light weight and the like, the aluminum-plastic composite film is mainly used as a shell for packaging, and the safety performance and the service performance of the battery core are directly determined by the good hot-press packaging of the aluminum-plastic composite film. And the qualified difficulty of hot-press packaging is obviously higher than that of top sealing and side sealing due to the unique characteristic that the Degas packaging after liquid injection is influenced by electrolyte during packaging. How to ensure that the package is acceptable in the presence of the electrolyte is a challenge to the industry.
The existing packaging technology mainly has the following problems: at present, Degas packaging is mostly carried out by using upper and lower flat seal heads with the width of 4-5mm, free electrolyte in a packaging area is pumped out by vacuumizing, and under the condition that the amount of free electrolyte is large, the electrolyte is accumulated in the packaging area to absorb the heat of the seal heads, so that the uniform fusion of two layers of aluminum-plastic composite films is influenced, finally, the poor molten glue or the insufficient packaging strength after packaging is caused, and the leakage safety accident is formed.
Disclosure of Invention
The invention aims to provide a method for improving the reliability of a Degas package aiming at the problems in the prior art.
The purpose of the invention can be realized by the following technical scheme:
the upper end enclosure and the lower end enclosure are both provided with notches, the notches of the upper end enclosure and the lower end enclosure are provided with mushroom-shaped heads, the notches of the lower end enclosure are provided with T-shaped heads, and the mushroom-shaped heads and the T-shaped heads are made of soft materials.
Preferably, the upper end socket slot and the lower end socket slot are positioned in the middle of the end face and are in one of a T shape and a vertical strip shape.
Further preferably, the depth of the groove is 1-5mm, and the width of the groove is 1-3 mm.
Preferably, the bottom 4 of the mushroom-shaped head is square, the height of the mushroom-shaped head is equal to the depth of the groove of the upper sealing head, the width of the mushroom-shaped head is equal to the width of the groove of the upper sealing head, the top 3 of the mushroom-shaped head is semicircular, and the diameter of the cambered surface of the mushroom-shaped head is equal to the width of the upper sealing head.
Preferably, the height of the bottom of the T-shaped head is the same as the depth of the groove of the lower end socket, the width of the bottom 6 is the same as the width of the groove of the lower end socket, and the width of the top 5 is the same as the width of the lower end socket.
Preferably, the soft material comprises one or more of silica gel and rubber.
The arc-shaped soft material can be matched with the plane soft material, and free electrolyte in the packaging area is effectively extruded from the point and the surface, so that the packaging is not influenced by the electrolyte.
Preferably, the joint of the mushroom-shaped head and the end enclosure is fixedly connected with the outer side of the joint of the T-shaped head and the end enclosure through a high-temperature-resistant adhesive tape.
A method for improving the reliability of a Degas package by using an upper head and a lower head comprises the following steps: and in the packaging process, the free electrolyte in the packaging area between the two layers of aluminum-plastic composite films is removed through the extrusion of the upper end enclosure and the lower end enclosure, and the Degas packaging is completed through the steps of vacuumizing, heating and pressurizing.
Preferably, the vacuum degree of the Degas pumping and packaging is 75-100KPa under negative pressure, the pressure of a pressing plate is 0-0.6MPa, and the vacuumizing retention time is 2-8 s.
Preferably, the heating temperature is 140-.
Preferably, the aluminum-plastic composite film comprises one or more of a PP aluminum-plastic film and a PE aluminum-plastic film.
Compared with the prior art, the invention has the following beneficial effects:
1. the mushroom-shaped head soft material of the upper end socket and the T-shaped head soft material of the lower end socket are matched and extruded, electrolyte in a packaging area is effectively extruded from a point and a surface, and then the Degas packaging is completed by heating and pressurizing, so that the melting of the two layers of aluminum-plastic composite films after packaging is not influenced by the electrolyte, and the packaging quality is also ensured.
2. Through setting up the replaceable soft material head, effectively reduce the use wearing and tearing of metal head, show improvement metal head life, reduce the processing requirement and the cost of head to soft material head can easily be replaced.
Drawings
Fig. 1 is a schematic view of an upper metal head.
Fig. 2 is a schematic view of the lower metal head.
Fig. 3 is a schematic view of a header mushroom type head.
Fig. 4 is a schematic view of a T-shaped head of the lower head.
Fig. 5 is a schematic view of the extrusion of the upper head and the lower head.
In the figure, 1, an upper end enclosure; 2. a lower end enclosure; 3. a mushroom-type head; 31. the top of the mushroom-type head; 32. the bottom of a mushroom-type head; 4. a T-shaped head; 41. the top of the T-shaped head; 42. the bottom of the T-shaped head.
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.
Example 1
The middle parts of the end surfaces of the upper end socket 1 and the lower end socket 2 are provided with vertical strip-shaped grooves, the groove depth is 4mm, and the groove width is 2 mm; establish mushroom type head 3 at the head, its top 31 semicircle silica gel diameters are 4mm, establish the T type head 4 at the low head, and the width of the square silica gel of its top 41 is 4mm, and the height is 2 mm.
The packaging material is a PP aluminum plastic film with the thickness of 76mm, the vacuum degree of Degas air extraction packaging is set to be 85KPa under negative pressure, the pressure of a pressing plate is 0.4MPa, and the vacuum extraction retention time is set to be 5 s; the temperature of the upper and lower end socket thermocouples is set to be 160 ℃, the packaging pressure is set to be 0.5MPa, and the packaging time is set to be 6 s. In the automatic mode, actions such as air bag puncture, vacuum pumping, pressing of the cell main body by the pressing plate, hot-pressing and packaging are completed in the sealed cavity, and the extrusion process of the upper end enclosure and the lower end enclosure is shown in fig. 5.
Observing the seal melting glue to be uniform milky white; no swelling at 60 ℃ and 92% relative humidity; the seal is permeated by using a penetrant, and is still kept for 4 hours at the normal temperature of 25 ℃ without penetrating, so that the reliability of the package is shown.
Example 2
The middle parts of the end surfaces of the upper end socket and the lower end socket are provided with vertical strip-shaped grooves, the groove depth is 4mm, and the groove width is 3 mm; the semicircular silica gel diameter of the mushroom-shaped head part arranged on the upper end socket is 4mm, the width of the square silica gel arranged on the top of the T-shaped head part of the lower end socket is 4mm, and the height of the square silica gel is 2 mm.
The packaging material is a PE aluminum plastic film with the thickness of 88mm, the vacuum degree of Degas air extraction packaging is set to be 95KPa under negative pressure, the pressure of a pressing plate is 0.3MPa, and the vacuum extraction retention time is set to be 8 s; the temperature of the upper and lower end socket thermocouples is set to 170 ℃, the packaging pressure is set to 0.4MPa, and the packaging time is set to 6 s. In an automatic mode, actions such as air bag puncture, vacuum pumping, pressing of the cell main body by the pressing plate, hot-pressing packaging and the like are completed in the sealed cavity.
Observing the seal melting glue to be uniform milky white; no swelling at 63 ℃ and 96% relative humidity; the seal is not penetrated by penetrating agent and stands still for 4 hours at the normal temperature of 29 ℃, and the reliability of the package is shown.
Comparative example 1
The upper and lower sealing heads are metal plane sealing heads covered with Teflon adhesive tapes.
The packaging material is a PE aluminum plastic film with the thickness of 86mm, the vacuum degree of Degas air extraction packaging is set to be 95KPa under negative pressure, the pressure of a pressing plate is 0.4MPa, and the vacuum extraction retention time is set to be 4 s; the temperature of the upper and lower end socket thermocouples is set to be 160 ℃, the packaging pressure is set to be 0.5MPa, and the packaging time is set to be 6 s. In an automatic mode, actions such as air bag puncture, vacuum pumping, pressing of the cell main body by the pressing plate, hot-pressing packaging and the like are completed in the sealed cavity.
Observing seal melten gel, wherein local melten gel is missing or is in a pockmark shape; when the temperature is 60 ℃ and the relative humidity is 90%, the individual battery core bulges; the seal is permeated by using a penetrant, and is kept still for 4 hours at the normal temperature of 25 ℃, so that the penetrability of individual cells exists.
Comparative example 2
The upper and lower sealing heads are metal plane sealing heads covered with Teflon adhesive tapes.
The packaging material is a PP aluminum plastic film with the thickness of 87mm, the vacuum degree of Degas air extraction packaging is set to be negative pressure 80KPa, the pressure of a pressing plate is 0.5MPa, and the vacuum extraction retention time is set to be 6 s; the temperature of the upper and lower end socket thermocouples is set to 170 ℃, the packaging pressure is set to 0.4MPa, and the packaging time is set to 7 s. In an automatic mode, actions such as air bag puncture, vacuum pumping, pressing of a pressing plate to extrude the cell main body, hot-pressing packaging and the like are completed in the sealed cavity, and the amount of free electrolyte in the cell is reduced to 0.3 g.
Observing the seal melting glue to be uniform milky white; when the temperature is 62 ℃ and the relative humidity is 91%, individual battery cell bulges; the seal is permeated by a penetrant, and is kept still for 4 hours at the normal temperature of 24 ℃, so that the penetrability of individual cells exists.
Comparative example 3
The upper and lower sealing heads are metal plane sealing heads covered with Teflon adhesive tapes.
The packaging material is a PP aluminum plastic film with the thickness of 91mm, the vacuum degree of Degas air extraction packaging is set to be negative pressure 90KPa, the pressure of a pressing plate is 0.3MPa, and the vacuum extraction retention time is set to be 5 s; the heating temperature of the upper and lower end socket thermocouples is set to 220 ℃, the packaging pressure is set to be 0.4MPa, and the packaging time is set to be 6 s. In an automatic mode, actions such as air bag puncture, vacuum pumping, pressing of the cell main body by the pressing plate, hot-pressing packaging and the like are completed in the sealed cavity.
Observing the seal melting glue to be uniform milky white; no swelling at 63 ℃ and 94% relative humidity; the seal is permeated by using a penetrant, and is kept still for 4 hours at the normal temperature of 26 ℃, so that the penetrability of individual cells exists.
In conclusion, the upper end socket with the mushroom-shaped head and the lower end socket with the T-shaped head are matched for use, so that the electrolyte in the packaging area can be effectively removed, and the packaging reliability is ensured; and the soft material that can conveniently replace has reduced the wearing and tearing of metal head, has reduced the cost. Lowering the amount of free electrolyte inside the cell to lower values or raising the packaging temperature can slightly increase the reliability of the packaging, but the overall result is not as good as in the embodiments within the scope of protection of the present invention.
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. An upper end enclosure and a lower end enclosure for Degas packaging are characterized in that the upper end enclosure and the lower end enclosure are both provided with notches, the notches of the upper end enclosure are provided with mushroom-shaped heads, and the notches of the lower end enclosure are provided with T-shaped heads; the mushroom-shaped head and the T-shaped head are both made of soft materials.
2. A closure according to claim 1, wherein the upper and lower closure slots are located in the middle of the end surface and are one of T-shaped and vertical strips.
3. A closure according to claim 1, wherein the mushroom head has a square bottom, a height equal to the depth of the upper closure groove, a width equal to the width of the upper closure groove, a semicircular top, and a diameter of the arc surface equal to the width of the upper closure.
4. A closure according to claim 1, wherein the height of the bottom of the T-shaped head is the same as the depth of the slot of the lower closure, the width of the bottom is the same as the width of the slot of the lower closure, and the width of the top is the same as the width of the lower closure.
5. A closure according to claim 1, wherein the soft material comprises one or more of silicone, rubber.
6. A seal head according to claim 1, characterized in that the connection part of the mushroom-shaped head and the seal head is fixedly connected with the outer side of the connection part of the T-shaped head and the seal head through a high temperature resistant adhesive tape.
7. A method for improving the reliability of Degas packaging by using the upper head and the lower head as claimed in claim 1, wherein the method comprises: and in the packaging process, the free electrolyte in the packaging area between the two layers of aluminum-plastic composite films is removed through the extrusion of the upper end enclosure and the lower end enclosure, and the Degas packaging is completed through the steps of vacuumizing, heating and pressurizing.
8. The method according to claim 7, wherein the Degas pumping packaging vacuum degree is 75-100KPa under negative pressure, the pressure of the pressing plate is 0.1-0.6MPa, and the vacuum pumping holding time is 2-8 s.
9. The method as claimed in claim 7, wherein the heating temperature is 140-200 ℃, the sealing pressure is 0.1-0.6MPa, and the sealing time is 2-8 s.
10. The method of claim 7, wherein the aluminum-plastic composite film comprises one or more of a PP aluminum-plastic film and a PE aluminum-plastic film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110703229.1A CN113659258A (en) | 2021-06-24 | 2021-06-24 | Upper end socket and lower end socket for Degas packaging and method for improving Degas packaging reliability by using upper end socket and lower end socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110703229.1A CN113659258A (en) | 2021-06-24 | 2021-06-24 | Upper end socket and lower end socket for Degas packaging and method for improving Degas packaging reliability by using upper end socket and lower end socket |
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| Publication Number | Publication Date |
|---|---|
| CN113659258A true CN113659258A (en) | 2021-11-16 |
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|---|---|---|---|
| CN202110703229.1A Pending CN113659258A (en) | 2021-06-24 | 2021-06-24 | Upper end socket and lower end socket for Degas packaging and method for improving Degas packaging reliability by using upper end socket and lower end socket |
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| CN (1) | CN113659258A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114300752A (en) * | 2021-12-28 | 2022-04-08 | 远东电池江苏有限公司 | Polymer lithium battery top sealing head with excellent packaging effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114300752A (en) * | 2021-12-28 | 2022-04-08 | 远东电池江苏有限公司 | Polymer lithium battery top sealing head with excellent packaging effect |
| CN114300752B (en) * | 2021-12-28 | 2024-02-02 | 远东电池江苏有限公司 | Polymer lithium battery top sealing head with excellent packaging effect |
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