CN114639928A - Battery sealing plug, battery and manufacturing method - Google Patents
Battery sealing plug, battery and manufacturing method Download PDFInfo
- Publication number
- CN114639928A CN114639928A CN202210279916.XA CN202210279916A CN114639928A CN 114639928 A CN114639928 A CN 114639928A CN 202210279916 A CN202210279916 A CN 202210279916A CN 114639928 A CN114639928 A CN 114639928A
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- Prior art keywords
- plug
- battery
- plug body
- sealing
- head
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- 238000007789 sealing Methods 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000002347 injection Methods 0.000 claims description 35
- 239000007924 injection Substances 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 31
- 239000003792 electrolyte Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 239000013013 elastic material Substances 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052744 lithium Inorganic materials 0.000 abstract description 3
- 239000013536 elastomeric material Substances 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000006256 anode slurry Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000013022 venting 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
- H01M50/60—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
- H01M50/645—Plugs
- H01M50/655—Plugs specially adapted for venting
-
- 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
-
- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/52—Removing gases inside the secondary cell, e.g. by absorption
-
- 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)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Filling, Topping-Up Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a battery sealing plug, a battery and a manufacturing method, which belong to the technical field of batteries and are characterized by at least comprising the following steps: a plug body constructed of an elastomeric material; the plug body comprises an upper plug body with a cylindrical structure and a lower plug body with a circular truncated cone structure; the diameter of the upper plug body is R, the diameter of the upper surface of the lower plug body is R, and the diameter of the lower surface of the lower plug body is R; r is greater than R; the lower end face of the upper plug body is fixedly connected with the upper surface of the lower plug body; the plug head is connected to the lower end face of the lower plug body; the plug head is conical or truncated cone-shaped; the diameter of the upper surface of the lower plug body is larger than that of the lower surface of the lower plug body; the plug tail is connected to the upper end face of the upper plug body; the area of the lower surface of the plug tail is larger than that of the end surface of the upper plug body; wherein: the plug head is provided with at least one air guide groove and/or air guide hole which are communicated with the upper surface and the lower surface of the plug head. The invention can improve the production efficiency of the lithium battery and reduce the production loss of the battery.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a battery sealing plug, a battery and a manufacturing method.
Background
In the current production process of batteries, such as lithium ion batteries, the production process usually includes the steps of liquid injection, pre-formation, negative pressure exhaust, formation and sealing.
In the electrolyte injection step, electrolyte is injected into the battery through the electrolyte injection hole, and then the sealing plug for pre-formation is plugged on the electrolyte injection hole to perform pre-formation. The battery will produce gas during the pre-formation process, and the gas is sealed inside the battery due to the existence of the pre-formation sealing plug. After the pre-formation, the pre-formation is pulled out by using a sealing plug, the battery is placed in a negative pressure environment, and gas in the battery can be discharged in the negative pressure environment. After exhausting, the liquid filling hole is plugged with a sealing plug for sealing.
As can be seen from the above description of the steps, the battery production process has a process of replacing the sealing plug, which greatly reduces the production efficiency. Meanwhile, even if the preformed sealing plug can be reused, the sealing plug is cleaned, dried and the like before being reused, so that the production cost is increased by the existing process.
Disclosure of Invention
The invention provides a battery sealing plug, a lithium ion battery and a manufacturing method for solving the technical problems in the prior art; the method is used for improving the production efficiency of the lithium battery and reducing the production loss of the battery.
A first object of the present invention is to provide a battery sealing plug, comprising at least:
a plug body (2) made of an elastic material; the plug body (2) comprises an upper plug body (2-1) with a cylindrical structure and a lower plug body (2-2) with a circular truncated cone structure; the diameter of the upper plug body is R, the diameter of the upper surface of the lower plug body is R, and the diameter of the lower surface of the lower plug body is R; r is greater than R; the lower end face of the upper plug body is fixedly connected with the upper surface of the lower plug body;
the plug head (1) is connected to the lower end face of the lower plug body (2-2); the plug head (1) is conical or truncated cone-shaped; the diameter of the upper surface of the lower plug body is larger than that of the lower surface of the lower plug body;
a plug tail (3) connected with the upper end surface of the upper plug body (2-1); the area of the lower surface of the plug tail (3) is larger than that of the end surface of the upper plug body (2-1); wherein:
the plug head (1) is provided with at least one air guide groove and/or air guide hole, the upper end face of the air guide groove and/or the air guide hole is located on the upper surface of the plug head (1), and the lower end face of the air guide groove and/or the air guide hole is located on the side wall of the conical plug head (1) or the side wall and/or the lower surface of the truncated cone-shaped plug head (1).
Preferably, the plug tail (3) is cylindrical.
Preferably, the plug head (1), the plug body (2) and the plug tail (3) are in a coaxial relationship.
Preferably, the plug head (1), the plug body (2) and the plug tail (3) are of an integrally formed structure;
or the plug head (1) and the plug body (2) are of an integrally formed structure, and the plug body (2) and the plug tail (3) are bonded;
or the plug body (2) and the plug tail (3) are of an integrally formed structure; the plug head (1) and the plug body (2) are bonded.
Preferably, the plug head (1), the plug body (2) and the plug tail (3) are bonded in sequence.
Preferably, the side wall of the upper plug body (2-1) is provided with an annular bulge (2-1-1).
Preferably, the axial cross-sectional shape of the annular convex part (2-1-1) is an arch or a trapezoid or a triangle or a quadrangle.
Preferably, the side wall of the plug body (2) is provided with an air guide groove (2-2-1); the lower port of the air guide groove (2-2-1) is positioned on the side wall of the lower plug body, and the upper port of the air guide groove (2-2-1) is positioned on the side wall of the upper plug body.
A second object of the present invention is to provide a battery comprising the battery sealing plug of the above-mentioned structure; the diameter of the liquid injection hole of the lithium ion battery is not more than 95% of the maximum diameter of the plug body (2).
The third purpose of the invention is to provide a battery, which comprises the battery sealing plug with the structure, wherein the height of the part of the lithium ion battery where the liquid injection hole is matched with the plug body (2) is smaller than the length of the upper plug body (2-1).
A fourth object of the present invention is to provide a method for manufacturing a battery, including:
s1, preparing a pole group by stacking the anode, the diaphragm and the cathode, wherein the anode and the cathode are respectively provided with a pole lug;
s2, arranging the current collectors of the positive electrode and the negative electrode on a battery cover plate, keeping insulation with the battery cover plate through an insulating material, welding a positive electrode tab and a positive electrode current collector in a pole group together, and welding a negative electrode tab and a negative electrode current collector in the pole group together;
s3, wrapping an insulating material on the periphery of the electrode group, placing the electrode group into a battery case, welding the battery case and a battery cover plate together, wherein the cover plate is provided with a liquid injection hole, and the diameter of the liquid injection hole is not more than 95% of the maximum diameter of the plug body (2);
s4, injecting electrolyte into the battery through the electrolyte injection hole;
s5, plugging the battery sealing plug into the liquid injection hole downwards until the plug tail of the battery sealing plug contacts the battery cover;
s6, pre-forming the battery;
s7, after the battery is pre-formed, the battery is placed in a vacuum environment for exhausting, the battery sealing plug is lifted under the action of the internal and external pressure difference of the battery, an air release channel is opened, the gas in the battery is exhausted through an air guide groove in the lower half part of the plug body, the diameter of the upper end surface of the plug head is larger than that of the liquid injection hole, so that the sealing plug is clamped by the liquid injection hole, and the sealing plug is prevented from being flushed out of the battery by airflow during exhausting;
and S8, plugging the exhausted battery sealing plug into the liquid injection hole again until the plug tail of the battery sealing plug contacts the battery cover, and welding a sealing piece of the liquid injection hole on the upper part of the sealing plug.
The invention has the advantages and positive effects that:
by adopting the sealing plug provided by the invention, the sealing plug can be prevented from being replaced in the production process of the battery, the production process is simplified, the production efficiency is improved, and the production cost is reduced.
The sealing plug provided by the invention can be widely applied to various battery systems, including but not limited to lithium ion batteries, lithium sulfur batteries, metal lithium batteries, sodium ion batteries and the like.
Drawings
FIG. 1 is a block diagram of a first preferred embodiment of the present invention;
FIG. 2 is a block diagram of a second preferred embodiment of the present invention;
FIG. 3 is a block diagram of a third preferred embodiment of the present invention;
FIG. 4 is a block diagram of a fourth preferred embodiment of the present invention;
fig. 5 is a schematic diagram of a battery structure using the sealing plug provided by the present invention;
FIG. 6 is a schematic view showing the relative positions of the sealing plug and the battery during the pre-formation process;
FIG. 7 is a schematic view showing the relative positions of the sealing plug and the battery during venting;
fig. 8 is a schematic view of the final state of the relative position of the sealing stopper and the cell after the cell manufacturing process is completed.
Wherein: 1. a plug head; 2. a plug body; 2-1, an upper plug body; 2-2, a lower plug body; 2-1-1, an annular boss; 2-2-1 air guide groove; 3. plugging the tail; 4. an air vent; 5. a gas guide groove; 6. a battery cover substrate; 7. a battery case; 8. a positive current collector; 9. a positive terminal; 10. a pole seal element; 11. a positive electrode insulating sleeve; 12. a negative current collector; 13. a negative terminal; 14. a negative electrode insulating sleeve; 15. a pole group; 16. a gas release valve; 17. a liquid injection hole sealing member; 18. and (4) sealing the plug.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 4, the technical solution of the present invention is:
a battery sealing plug comprising: the plug comprises a plug head 1, a plug body 2 and a plug tail 3; wherein:
the plug body 2 is made of elastic material; the plug body comprises an upper plug body 2-1 with a cylindrical structure and a lower plug body 2-2 with a circular truncated cone structure; the diameter of the upper plug body is R, the diameter of the upper surface of the lower plug body is R, and the diameter of the lower surface of the lower plug body is R; r is greater than R; the lower end face of the upper plug body is fixedly connected with the upper surface of the lower plug body;
the plug head 1 is connected with the lower end face of the lower plug body 2-2; the plug head is conical or truncated cone-shaped or mushroom-shaped or hemispherical; the diameter of the upper surface of the lower plug body is larger than that of the lower surface of the lower plug body;
the plug tail 3 is connected with the upper end surface of the upper plug body 2-1; the area of the lower surface of the plug tail is larger than that of the end face of the upper plug body; the plug tail 3 is cylindrical or mushroom-shaped or hemispherical. Wherein:
the plug head 1 is provided with at least one air guide groove and/or air guide hole, the upper end surface of the air guide groove and/or the air guide hole is positioned on the upper surface of the plug head 1, and the lower end surface of the air guide groove and/or the air guide hole is positioned on the side wall of the conical plug head 1 or the side wall and/or the lower surface of the truncated cone-shaped plug head 1.
The plug head 1, the plug body 2 and the plug tail 3 are in a coaxial relationship, and a non-coaxial relationship can also be adopted.
The plug head 1, the plug body 2 and the plug tail 3 are of an integrally formed structure;
or the plug head 1 and the plug body 2 are of an integrally formed structure, and the plug body 2 and the plug tail 3 are bonded;
or the plug body 2 and the plug tail 3 are of an integrally formed structure; the plug 1 and the plug body 2 are bonded.
Or the plug head 1, the plug body 2 and the plug tail 3 are sequentially bonded.
The side wall of the upper plug body 2-1 is provided with an annular convex part 2-1-1.
The axial section of the annular convex part 2-1-1 is in an arch shape, a trapezoid shape, a triangle shape or a quadrangle shape.
The side wall of the plug body 2 is provided with an air guide groove 2-2-1; the lower port of the air guide groove 2-2-1 is positioned on the side wall of the lower plug body, and the upper port of the air guide groove 2-2-1 is positioned on the side wall of the upper plug body.
The above technical scheme mainly comprises:
a plug body 2 made of an elastic material;
the plug head 1 is fixed at one end of the plug body;
and the plug tail 3 is fixed at the other end of the plug body.
The cylindrical structure of the plug body is composed of two sections, the upper half part is a cylinder, the upper end face a of the cylinder is connected with the lower end face t of the plug tail, the area Sa is less than St, the lower end face b of the upper half part is connected with the upper end face c of the lower half part, the area Sc is Sb, the lower end face d of the lower half part is connected with the upper end face h of the plug head, and the area Sd is less than Sh.
The plug head is a cone, the area of the upper end face h of the cone is large, Sh is larger than Sa, and the end face is fixed with the plug body. The plug head is provided with at least one air guide groove or air guide hole.
The plug tail is a column, and the diameter of at least one end face of the column is larger than the maximum diameter of the plug body.
The battery sealing plug of claim 1, wherein the plug body, the plug head and the plug tail are of an integral structure and can be formed by gluing or integral casting.
The surface of the upper half part of the columnar structure forming the plug body is provided with at least one annular bulge, and the cross section of the bulge comprises a bow shape, a trapezoid shape, a triangle shape and a quadrilateral shape.
The columnar structure forming the plug body is provided with an air guide groove, the length of the air guide groove is larger than the length of the lower half part of the plug body but smaller than the length of the plug body, and the air guide groove is positioned at one end close to the plug head.
As shown in fig. 5:
a battery, comprising: the battery cover comprises a battery cover base body 6, a battery case 7, a positive pole current collector 8, a positive pole terminal 9, a pole sealing piece 10, a positive pole insulating sleeve 11, a negative pole current collector 12, a negative pole terminal 13, a negative pole insulating sleeve 14, a pole group 15, an air leakage valve 16, a liquid injection hole sealing piece 17 and a battery sealing plug 18 with the structure, wherein the diameter of a liquid injection hole of the battery is not more than 95% of the maximum diameter of a plug body of the battery sealing plug.
A battery, comprising: the battery cover comprises a battery cover base body 6, a battery case 7, a positive current collector 8, a positive terminal 9, a pole sealing piece 10, a positive insulating sleeve 11, a negative current collector 12, a negative terminal 13, a negative insulating sleeve 14, a pole group 15, an air leakage valve 16, a liquid injection hole sealing piece 17 and a battery sealing plug 18 of the structure, wherein the height of the matched part of the liquid injection hole of the battery and the sealing plug body is smaller than the length of the plug body.
The concept of the present invention is explained in detail below by taking a specific battery as an example:
the electrochemical system of the battery adopts a lithium iron phosphate-graphite system.
Uniformly mixing lithium iron phosphate, conductive carbon black, carbon nano tubes, PVDF binder slurry and the like according to a certain proportion to prepare anode slurry, uniformly coating the anode slurry on two sides of an aluminum foil, reserving a non-coating area with the width of 11mm during coating, and preparing an anode plate through drying, rolling and punching, wherein the thickness is 100 mu m, and the total coating amount on the two sides is 20mg/cm2The thickness of the aluminum foil is 15 μm, the length of the pole piece without the tab is 119mm, and the width is 80 mm. The length of the pole lug is 60mm, the width of the pole lug is 11mm, and the position of the pole lug is centered. And no slurry is coated at the tab.
Uniformly mixing graphite, conductive carbon black, SBR binder slurry and the like according to a certain proportion to prepare negative electrode slurry, uniformly coating the negative electrode slurry on the two sides of a copper foil, reserving a non-coating area with the width of 9mm during coating, and preparing a negative electrode sheet through drying, rolling and punching, wherein the thickness is 100 mu m, and the total coating amount on the two sides is 10mg/cm2The thickness of the aluminum foil is 10 μm, the length of the pole piece without the tab is 123mm, and the width is 84 mm. The length of the pole lug is 60mm, the width of the pole lug is 9mm, and the position of the pole lug is centered. And no slurry is coated at the tab.
And laminating the diaphragm, the positive plate, the diaphragm, the negative plate, the diaphragm, the positive plate, the diaphragm and the negative plate … in sequence to prepare a pole group, wherein the positive and negative non-coating areas are respectively positioned at two ends of the pole group. The positive lug is connected to the positive plate; the negative electrode lug is connected to the negative electrode plate; the thickness of the single-layer separator was 20 μm. The total thickness of the pole group is 24 mm.
The outer dimension of the battery can is 148mm multiplied by 27mm multiplied by 97mm, the thickness is 0.6mm, and the material is aluminum alloy.
The method comprises the following steps of sleeving a sealing piece on a positive current collector, drilling into a battery cover plate, sleeving a positive insulating sleeve and a positive terminal on the top end of the positive current collector, tightly matching the positive current collector, the positive terminal and the insulating sleeve in a stamping mode, and simultaneously pressing the sealing piece and the battery cover plate. The negative current collector is mounted by the same method.
And welding a plurality of layers of positive electrode lugs and positive current collectors in the electrode group together by adopting laser, and welding a plurality of layers of negative electrode lugs and negative current collectors in the electrode group together by adopting laser.
And (3) wrapping an insulating adhesive tape on the periphery of the pole group, putting the pole group into a battery case, and welding the battery case and the battery cover plate together by adopting laser.
And injecting electrolyte into the battery through the electrolyte injection hole. The amount of electrolyte was 130 g.
The sealing plug provided by the invention is plugged into the liquid injection hole downwards until the plug tail of the sealing plug contacts the battery cover. The diameter of the plug tail is larger than that of the liquid injection hole, so that the positioning effect can be achieved, and the sealing plug is prevented from falling into the battery integrally. And (4) performing pre-formation on the battery, wherein gas is generated in the battery during the pre-formation. After the pre-formation, the battery is placed in a vacuum environment for exhausting, the sealing plug is lifted under the action of the internal and external pressure difference of the battery, the air leakage channel is opened, the gas in the battery is exhausted through the air guide groove at the lower half part of the sealing plug body, the diameter of the upper end surface of the plug head is larger than that of the liquid injection hole, the sealing plug can be clamped by the liquid injection hole, and the sealing plug is prevented from being flushed out of the battery by airflow during exhausting. The battery sealing plug after exhausting is plugged into the liquid injection hole again, and the sealing element of the liquid injection hole is welded on the upper part of the sealing plug, so that the sealing plug is prevented from being accidentally poked into the battery or being accidentally opened by internal gas in the use of the battery. After the sealing plug provided by the invention is adopted, the process of replacing the sealing plug is avoided in the production process of the battery, the production efficiency is greatly improved, and the production cost of the battery is reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (11)
1. A battery sealing plug, comprising at least:
a plug body (2) made of an elastic material; the plug body (2) comprises an upper plug body (2-1) with a cylindrical structure and a lower plug body (2-2) with a circular truncated cone structure; the diameter of the upper plug body is R, the diameter of the upper surface of the lower plug body is R, and the diameter of the lower surface of the lower plug body is R; r is greater than R; the lower end face of the upper plug body is fixedly connected with the upper surface of the lower plug body;
the plug head (1) is connected to the lower end face of the lower plug body (2-2); the plug head (1) is conical or truncated cone-shaped; the diameter of the upper surface of the lower plug body is larger than that of the lower surface of the lower plug body;
a plug tail (3) connected with the upper end surface of the upper plug body (2-1); the area of the lower surface of the plug tail (3) is larger than that of the end surface of the upper plug body (2-1); wherein:
the plug head (1) is provided with at least one air guide groove and/or air guide hole, the upper end face of the air guide groove and/or the air guide hole is located on the upper surface of the plug head (1), and the lower end face of the air guide groove and/or the air guide hole is located on the side wall of the conical plug head (1) or the side wall and/or the lower surface of the truncated cone-shaped plug head (1).
2. The battery sealing stopper of claim 1, wherein the stopper tail (3) is cylindrical.
3. A battery sealing stopper according to claim 2 characterised in that the stopper head (1), stopper body (2) and stopper tail (3) are in a coaxial relationship.
4. A battery sealing stopper as claimed in any one of claims 1 to 3, wherein:
the plug head (1), the plug body (2) and the plug tail (3) are of an integrally formed structure;
or the plug head (1) and the plug body (2) are of an integrally formed structure, and the plug body (2) and the plug tail (3) are bonded;
or the plug body (2) and the plug tail (3) are of an integrally formed structure; the plug head (1) and the plug body (2) are bonded.
5. A battery sealing plug according to any of claims 1-3, characterized in that the plug head (1), the plug body (2) and the plug tail (3) are bonded in sequence.
6. A battery sealing stopper according to any of claims 1-3, characterized in that the upper stopper body (2-1) side wall is provided with an annular protrusion (2-1-1).
7. The battery sealing stopper according to claim 6, wherein the axial cross-sectional shape of the annular protrusion (2-1-1) is arcuate or trapezoidal or triangular or quadrangular.
8. A battery sealing stopper according to any of claims 1-3, characterised in that the side wall of the stopper body (2) is provided with an air guiding groove (2-2-1); the lower port of the air guide groove (2-2-1) is positioned on the side wall of the lower plug body, and the upper port of the air guide groove (2-2-1) is positioned on the side wall of the upper plug body.
9. A battery comprising a battery sealing plug as claimed in any one of claims 1 to 8; the diameter of the liquid injection hole of the battery is not more than 95% of the maximum diameter of the plug body (2).
10. A battery comprising a battery sealing plug according to any one of claims 1 to 8, wherein the height of the part of the battery where the liquid filling hole is matched with the plug body (2) is smaller than the length of the upper plug body (2-1).
11. A method of making a battery, comprising:
s1, preparing a pole group by stacking the positive pole, the diaphragm and the negative pole, wherein the positive pole and the negative pole are respectively provided with a pole ear;
s2, arranging the current collectors of the positive electrode and the negative electrode on a battery cover plate, keeping insulation with the battery cover plate through an insulating material, welding a positive electrode tab and a positive electrode current collector in a pole group together, and welding a negative electrode tab and a negative electrode current collector in the pole group together;
s3, wrapping an insulating material on the periphery of the electrode group, placing the electrode group into a battery case, welding the battery case and a battery cover plate together, wherein the cover plate is provided with a liquid injection hole, and the diameter of the liquid injection hole is not more than 95% of the maximum diameter of the plug body (2);
s4, injecting electrolyte into the battery through the electrolyte injection hole;
s5, plugging the battery sealing plug into the liquid injection hole downwards until the plug tail of the battery sealing plug contacts the battery cover;
s6, pre-forming the battery;
s7, after the battery is pre-formed, the battery is placed in a vacuum environment for exhausting, the battery sealing plug is lifted under the action of the internal and external pressure difference of the battery, an air release channel is opened, the gas in the battery is exhausted through an air guide groove in the lower half part of the plug body, the diameter of the upper end surface of the plug head is larger than that of the liquid injection hole, so that the sealing plug is clamped by the liquid injection hole, and the sealing plug is prevented from being flushed out of the battery by airflow during exhausting;
and S8, plugging the exhausted battery sealing plug into the liquid injection hole again until the plug tail of the battery sealing plug contacts the battery cover, and welding a sealing piece of the liquid injection hole on the upper part of the sealing plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210279916.XA CN114639928A (en) | 2022-03-21 | 2022-03-21 | Battery sealing plug, battery and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210279916.XA CN114639928A (en) | 2022-03-21 | 2022-03-21 | Battery sealing plug, battery and manufacturing method |
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| CN114639928A true CN114639928A (en) | 2022-06-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395189A (en) * | 2022-09-30 | 2022-11-25 | 星恒电源股份有限公司 | Negative pressure sealing method for liquid injection hole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395189A (en) * | 2022-09-30 | 2022-11-25 | 星恒电源股份有限公司 | Negative pressure sealing method for liquid injection hole |
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