CN106876620B - Secondary battery liquid injection hole sealing assembly - Google Patents
Secondary battery liquid injection hole sealing assembly Download PDFInfo
- Publication number
- CN106876620B CN106876620B CN201510928855.5A CN201510928855A CN106876620B CN 106876620 B CN106876620 B CN 106876620B CN 201510928855 A CN201510928855 A CN 201510928855A CN 106876620 B CN106876620 B CN 106876620B
- Authority
- CN
- China
- Prior art keywords
- sealing
- liquid injection
- secondary battery
- injection hole
- layer
- 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.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 106
- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 238000002347 injection Methods 0.000 title claims abstract description 38
- 239000007924 injection Substances 0.000 title claims abstract description 38
- 239000012943 hotmelt Substances 0.000 claims abstract description 12
- 239000000155 melt Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 10
- 238000004880 explosion Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 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
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
The invention provides a secondary battery liquid injection hole sealing component, which is used for sealing a liquid injection hole arranged on a top cover of a secondary battery, and comprises the following components: a sealing nail and a sealing film. The sealing nails are plugged into the liquid injection holes so as to seal the liquid injection holes once; the sealing film completely covers the liquid injection hole and is bonded on the top cover in a hot-melt sealing manner so as to carry out secondary sealing on the liquid injection hole. In the secondary battery tap hole sealing assembly according to the present invention, the tap hole is sealed once by inserting the sealing nail into the tap hole, and the sealing film completely covering the tap hole is heat-fused to be sealed and adhered to the top cover, thereby secondarily sealing the tap hole. The invention adopts the hot-melt connection method to replace the welding mode in the traditional technology, thereby avoiding the problems of welding pinholes, explosion points, cracks and the like caused by welding, and the hot-melt sealing process is simple, convenient and reliable.
Description
Technical Field
The invention relates to the field of batteries, in particular to a secondary battery liquid injection hole sealing assembly.
Background
In the manufacturing process of a secondary battery (e.g., lithium ion battery), after the completion of the filling process, it is necessary to perform laser sealing welding of the filling hole O in the top cap 1 to prevent leakage of the electrolyte.
In the prior art, as shown in fig. 6 and 7, the concrete implementation process is to plug the liquid injection hole O on the top cover 1 with the T-shaped sealing nail 2 to prevent the electrolyte from overflowing and polluting the welding seam W, then clean the electrolyte remained above the liquid injection hole O, and finally seal the sealing cover plate 6 and the wall of the top cover 1 forming the liquid injection hole O in a laser full-welding manner, so as to form the full-welding seam W after welding.
The energy density of laser welding is very high and can reach 10 7 W/cm 2 The metal surface may be heated above the boiling point of the material to produce vaporization, where laser energy is transferred from the metal surface to the interior of the metal to form a molten pool. When the molten pool is close to the T-shaped plastic sealing nail 2, the plastic sealing nail 2 is vaporized instantaneously, and plastic steam is ejected upwards along the axial direction to drive the weld joint W of the molten pool to generate defects such as pinholes, explosion points, cracks and the like. In the same way, when the electrolyte remained on the surface of the liquid injection hole O is not cleaned, the electrolyte can be produced under the action of laserPinhole, explosion point, crack and other defects.
Disclosure of Invention
In view of the problems existing in the background art, an object of the present invention is to provide a secondary battery liquid injection hole sealing assembly, which solves the problems of welding pinholes, explosion points, cracks and the like caused by welding by adopting a hot melt connection method, and has simple, convenient and reliable sealing procedure.
In order to achieve the above object, the present invention provides a secondary battery liquid injection hole sealing assembly for sealing a liquid injection hole provided on a top cover of a secondary battery, comprising: a sealing nail and a sealing film. The sealing nails are plugged into the liquid injection holes so as to seal the liquid injection holes once; the sealing film completely covers the liquid injection hole and is bonded on the top cover in a hot-melt sealing manner so as to carry out secondary sealing on the liquid injection hole.
The beneficial effects of the invention are as follows:
in the secondary battery tap hole sealing assembly according to the present invention, the tap hole is sealed once by inserting the sealing nail into the tap hole, and the sealing film completely covering the tap hole is heat-fused to be sealed and adhered to the top cover, thereby secondarily sealing the tap hole. The invention adopts the hot-melt connection method to replace the welding mode in the traditional technology, thereby avoiding the problems of welding pinholes, explosion points, cracks and the like caused by welding, and the hot-melt sealing process is simple, convenient and reliable.
Drawings
Fig. 1 is a perspective view of a secondary battery filler hole sealing assembly of the present invention before sealing the secondary battery filler hole;
fig. 2 is an exploded view of a secondary battery pouring hole sealing assembly of the present invention;
fig. 3 is a schematic view showing an assembly and a sealing process of a secondary battery pouring hole sealing assembly according to the present invention;
fig. 4 is a schematic view of a secondary battery pour hole sealing assembly of the present invention after assembly and sealing;
fig. 5 is a schematic structural view of a sealing film of the secondary battery pouring hole sealing assembly of the present invention;
fig. 6 is an exploded view of a secondary battery pouring hole sealing assembly according to the related art;
fig. 7 is a schematic view of a secondary battery filling hole sealing assembly according to the related art after assembly and sealing.
Wherein reference numerals are as follows:
1 Top cover 32 Heat transfer layer
O-liquid injection hole 33 heat conduction layer
2 sealing nail 4 heating head
21 insert 5 adhesive part
22 stop 6 sealing cover plate
3 sealing film W weld
31 melt layer
Detailed Description
The secondary battery pouring hole sealing assembly according to the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 5, a secondary battery filling hole sealing assembly for sealing a filling hole O provided on a top cap 1 of a secondary battery according to the present invention includes: a sealing nail 2 and a sealing film 3. The sealing nail 2 is plugged into the liquid injection hole O to seal the liquid injection hole O once; the sealing film 3 completely covers the liquid filling hole O and is bonded to the top cover 1 by hot melt sealing to secondarily seal the liquid filling hole O.
In the secondary battery tap hole sealing assembly according to the present invention, the tap hole O is sealed once by inserting the sealing nail 2 into the tap hole O, and the sealing film 3 entirely covering the tap hole O is heat-fused to be sealed and adhered to the top cap 1, thereby secondarily sealing the tap hole O. The invention adopts the hot-melt connection method to replace the welding mode in the traditional technology, thereby avoiding the problems of welding pinholes, explosion points, cracks and the like caused by welding, and the hot-melt sealing process is simple, convenient and reliable.
According to the secondary battery filling hole sealing assembly of the present invention, in one embodiment, referring to fig. 2 to 4, the sealing nail 2 may be T-shaped.
In an embodiment, referring to fig. 2 to 4, the sealing spike 2 may have: an insertion portion 21 inserted into the liquid injection hole O in the top cap 1; and a stopper 22 which abuts on the top cover 1. In this embodiment, the insertion portion 21 of the sealing nail 2 is inserted into the liquid injection hole O on the top cover 1, and the stop portion 22 of the sealing nail 2 abuts against the top cover 1, so that the electrolyte is prevented from overflowing, and insufficient electrolyte in the battery cell and pollution on the surface of the top cover 1 affecting the hot melting quality of the sealing film 3 are avoided.
In an embodiment, the sealing spike 2 may also be tapered or cylindrical, but is not limited thereto, and may be designed in other shapes.
In one embodiment, the sealing nail 2 may be a plastic sealing nail, but the material of the sealing nail is not limited to this, and other types of materials may be selected according to specific needs.
In one embodiment, referring to fig. 5, the sealing film 3 may have: a melt layer 31 disposed on the top cover 1 to entirely cover the liquid injection hole O; a heat conductive layer 32 laminated on the melt layer 31; and a heat transfer layer 33 located at the uppermost layer of the sealing film 3, the heat transfer layer 32 transferring external heat to the melt layer 31 via the heat transfer layer 32 to melt the melt layer 31. In the present embodiment, the melted layer 31 of the sealing film 3 forms a tight continuous bond 5 with the top cover 1 when melted at high temperature, thereby completely sealing the pour hole O.
In one embodiment, the melt layer 31 is a polypropylene layer; the heat conductive layer 32 is aluminum foil; and the heat transfer layer 33 is a nylon layer, which is a specific structure (i.e., an aluminum plastic film) of the sealing film 3 used in the present invention, but not limited thereto, the melting layer 31, the heat transfer layer 32, and the heat transfer layer 33 of the sealing film 3 may be made of other types of materials. Among them, in the present embodiment, the use of aluminum foil for the heat conductive layer 32 increases the overall strength and toughness of the sealing film 3, and enhances the heat conductivity and uniformity of the temperature distribution of the melt layer 31, thereby improving the quality and efficiency of the hot-melt sealing.
In one embodiment, the thickness of the melt layer 31 may be 5 μm to 15 μm.
In one embodiment, the thickness of the thermally conductive layer 32 may be 5 μm to 15 μm.
In one embodiment, the thickness of the heat transfer layer 33 may be 5 μm to 15 μm.
It is to be noted that the thickness ranges of the melting layer 31, the heat conductive layer 32, and the heat transfer layer 33 described above are only preferable thickness ranges of the present invention, and the thickness ranges of the melting layer 31, the heat conductive layer 32, and the heat transfer layer 33 can be appropriately adjusted based on actual needs, processing, and production.
In one embodiment, referring to fig. 2 and 3, the sealing film 3 in the secondary battery pouring hole sealing assembly may be subjected to a heat-melting process using the heating head 4 so that the sealing film 3 is melted and sealed to be adhered to the top cap 1.
Claims (9)
1. A secondary battery liquid injection hole sealing assembly for sealing a liquid injection hole (O) provided in a top cap (1) of a secondary battery, the secondary battery liquid injection hole sealing assembly comprising:
a sealing nail (2) is plugged into the liquid injection hole (O) to seal the liquid injection hole (O) once;
the secondary battery liquid injection hole sealing assembly is characterized by further comprising:
the sealing film (3) is free of any through hole, completely covers the liquid injection hole (O) and is bonded on the top cover (1) in a hot-melt sealing manner so as to secondarily seal the liquid injection hole (O);
the sealing film (3) has:
a melting layer (31) which is arranged on the top cover (1) to completely cover the liquid injection hole (O);
a heat conductive layer (32) laminated on the melt layer (31); and
and a heat transfer layer (33) located at the uppermost layer of the sealing film (3), the heat transfer layer (33) transferring external heat to the melt layer (31) via the heat transfer layer (32) to melt the melt layer (31).
2. The secondary battery filler hole sealing assembly according to claim 1, wherein the sealing nail (2) is T-shaped.
3. The secondary battery pouring hole sealing assembly according to claim 2, wherein the sealing nail (2) has:
an insertion part (21) which is inserted into a liquid injection hole (O) on the top cover (1); and
a stop (22) which abuts against the top cover (1).
4. The secondary battery filler hole sealing assembly according to claim 1, wherein the sealing nail (2) is tapered or cylindrical.
5. The secondary battery filler hole sealing assembly according to claim 1, wherein the sealing nail (2) is a plastic sealing nail.
6. The secondary battery filler neck seal assembly according to claim 1,
the melting layer (31) is a polypropylene layer;
the heat conducting layer (32) is aluminum foil;
the heat transfer layer (33) is a nylon layer.
7. The secondary battery tap hole sealing arrangement according to claim 6, characterised in that the thickness of the melt layer (31) is 5-15 μm.
8. The secondary battery liquid injection hole sealing assembly according to claim 6, wherein the thickness of the heat conducting layer (32) is 5-15 μm.
9. The secondary battery liquid injection hole sealing assembly according to claim 6, wherein the thickness of the heat transfer layer (33) is 5-15 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510928855.5A CN106876620B (en) | 2015-12-14 | 2015-12-14 | Secondary battery liquid injection hole sealing assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510928855.5A CN106876620B (en) | 2015-12-14 | 2015-12-14 | Secondary battery liquid injection hole sealing assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106876620A CN106876620A (en) | 2017-06-20 |
| CN106876620B true CN106876620B (en) | 2023-08-22 |
Family
ID=59178609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510928855.5A Active CN106876620B (en) | 2015-12-14 | 2015-12-14 | Secondary battery liquid injection hole sealing assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106876620B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542664A (en) * | 2019-09-23 | 2021-03-23 | 湖南弘毅科技有限公司 | Square lithium battery and air tightness detection method thereof |
| CN112259846B (en) * | 2020-12-01 | 2021-03-30 | 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) | Power battery sealing structure and welding method thereof |
| CN113193276A (en) * | 2021-04-27 | 2021-07-30 | 宁德新能源科技有限公司 | Hard shell battery and power utilization device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11176418A (en) * | 1997-12-10 | 1999-07-02 | Mitsubishi Cable Ind Ltd | Sealed battery |
| CN1630118A (en) * | 2003-12-20 | 2005-06-22 | 鸿富锦精密工业（深圳）有限公司 | Method for sealing lithium ion battery |
| KR20080077424A (en) * | 2007-02-20 | 2008-08-25 | 삼성에스디아이 주식회사 | Secondary battery and method therefor |
| CN203165991U (en) * | 2013-03-08 | 2013-08-28 | 宁德新能源科技有限公司 | Filling port sealing device of lithium-ion battery |
| CN204809306U (en) * | 2015-07-15 | 2015-11-25 | 宁德时代新能源科技有限公司 | Secondary cell's notes liquid hole weld assembly |
| CN205211803U (en) * | 2015-12-14 | 2016-05-04 | 宁德时代新能源科技股份有限公司 | Secondary cell annotates liquid hole seal assembly |
-
2015
- 2015-12-14 CN CN201510928855.5A patent/CN106876620B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11176418A (en) * | 1997-12-10 | 1999-07-02 | Mitsubishi Cable Ind Ltd | Sealed battery |
| CN1630118A (en) * | 2003-12-20 | 2005-06-22 | 鸿富锦精密工业（深圳）有限公司 | Method for sealing lithium ion battery |
| KR20080077424A (en) * | 2007-02-20 | 2008-08-25 | 삼성에스디아이 주식회사 | Secondary battery and method therefor |
| CN203165991U (en) * | 2013-03-08 | 2013-08-28 | 宁德新能源科技有限公司 | Filling port sealing device of lithium-ion battery |
| CN204809306U (en) * | 2015-07-15 | 2015-11-25 | 宁德时代新能源科技有限公司 | Secondary cell's notes liquid hole weld assembly |
| CN205211803U (en) * | 2015-12-14 | 2016-05-04 | 宁德时代新能源科技股份有限公司 | Secondary cell annotates liquid hole seal assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106876620A (en) | 2017-06-20 |
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