阅读说明：本技术 一种软包锂电池注液口封口结构及其制造方法 (Soft package lithium battery liquid injection port sealing structure and manufacturing method thereof ) 是由 朱效铭 于 2021-02-05 设计创作，主要内容包括：本发明公开了一种软包锂电池注液口封口结构及其制造方法,该封口结构包括软包膜袋和袋口等,并在袋口处分隔出自动张开的注液口和插入注液口的抽真空管,袋口外设有上封口线和下封口线,该上封口线将袋口、注液口和抽空真管一体封闭,并使抽真空管的下端连通软包膜袋内抽气成真空,上端伸出注液口排气,该下封口线待软包膜袋内抽真空后完全封闭袋口和注液口。故利用注液口注液和利用抽真空管抽真空,既能简化生产工艺、减少生产设备和提高生产效率,又不会受到软包锂电池一次抽真空数量的限制；同时,只需利用上封口线和下封口线的简单设计,就能满足抽真空和完全封闭的需要,这些结构结合相应的制造方法都能较好降低软包锂电池的生产成本。(The invention discloses a sealing structure of a liquid filling opening of a soft-package lithium battery and a manufacturing method thereof, wherein the sealing structure comprises a soft-package film bag, a bag opening and the like, an automatically opened liquid filling opening and a vacuum pumping tube inserted into the liquid filling opening are separated at the bag opening, an upper sealing line and a lower sealing line are arranged outside the bag opening, the liquid filling opening and the vacuum pumping tube are integrally sealed by the upper sealing line, the lower end of the vacuum pumping tube is communicated with the interior of the soft-package film bag to be vacuumized, the upper end of the vacuum pumping tube extends out of the liquid filling opening to be exhausted, and the bag opening and the liquid filling opening are completely sealed by the lower sealing line after the interior. Therefore, the liquid is injected through the liquid injection port and the vacuum is pumped through the vacuum pumping pipe, so that the production process can be simplified, the production equipment can be reduced, the production efficiency can be improved, and the limitation of the one-time vacuum pumping quantity of the soft package lithium battery can be avoided; meanwhile, the requirements of vacuumizing and complete sealing can be met only by utilizing the simple design of the upper sealing line and the lower sealing line, and the structures can well reduce the production cost of the soft package lithium battery by combining with corresponding manufacturing methods.)

1. The utility model provides a soft packet of lithium cell annotates liquid mouth sealing structure, includes soft packet of membrane bag (1) and bag mouth (12) of setting on soft packet of membrane bag, its characterized in that bag mouth (12) punishment separate automatic open annotate liquid mouth (13) and insert vacuum tube (2) of annotating the liquid mouth, bag mouth (12) are equipped with outward and seal line (5) and seal line (6) down, should go up seal line (5) will bag mouth (12), annotate liquid mouth (13) and manage to find time vacuum tube (2) an organic whole and seal to make the interior evacuation of lower extreme intercommunication soft packet of membrane bag (1) of vacuum tube (2) become vacuum, the upper end of vacuum tube (2) is stretched out and is annotated liquid mouth (13) exhaust, should seal line (6) down and treat that the interior evacuation of soft packet of membrane bag (1) is sealed bag mouth (12) and annotate liquid mouth (13) after totally.

2. The sealing structure of the liquid filling opening of the soft package lithium battery according to claim 1, characterized in that the bag opening (12) is formed between two sheets (11) of the soft package bag (1).

3. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 2, wherein each membrane (11) is provided with two convex hulls (4) protruding inwards, and the two convex hulls (4) on the two membranes (11) are correspondingly contacted and enclosed to form the automatic opening liquid filling opening (13).

4. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 3, wherein the two convex hulls (4) on the two membranes (11) are located below the lower sealing line (6).

5. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 1, wherein the lower end of the vacuum tube (2) is located between the upper sealing line (5) and the lower sealing line (6).

6. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 1, wherein the lower sealing line (6) completely closes the bag opening (12) and the liquid filling opening (13) after the soft package film bag (1) is vacuumized, and the vacuum-pumping tube (2) is taken out of the upper sealing line (5).

7. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 1, wherein the upper sealing line (5) is formed by sealing with a sealing strip (7).

8. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 1, wherein the lower sealing line (6) is formed by clamping and heat sealing by a heat sealing knife (3).

9. The sealing structure of the liquid filling opening of the soft package lithium battery as claimed in claim 3, wherein the two convex hulls (4) on each membrane (11) are manufactured by a hot pressing process, and each convex hull (4) is hemispherical.

10. The manufacturing method of the sealing structure of the liquid filling opening of the soft package lithium battery as claimed in any one of claims 1 to 9, characterized in that the manufacturing method comprises the following steps:

step one, a soft packaging film bag (1) with a reserved bag opening (12) is manufactured through a film (11), two convex hulls (4) protruding inwards are manufactured on each film (11) forming the bag opening (12) through soaking and pressing, the two convex hulls (4) on the two films (11) correspond in position, and the two convex hulls (4) on the two films (11) are contacted with each other to just enclose and form an automatic opening liquid injection opening (13);

conveying the soft packaging film bag (1) to a liquid injection machine and a high-pressure liquid absorption machine, injecting electrolyte into the soft packaging film bag (1) through an automatically opened liquid injection port (13) by the liquid injection machine, and absorbing liquid by the high-pressure liquid absorption machine;

step three, after the electrolyte is injected into the soft packaging film bag (1) and the liquid absorption is finished, inserting the vacuumizing tube (2) into the liquid injection port (13), sealing the upper sealing line (5) through the sealing strip (7) to integrally seal the bag opening (12), the liquid injection port (13) and the vacuumizing vacuum tube (2), ensuring that the lower end of the vacuumizing tube (2) can be communicated with the soft packaging film bag (1) for air exhaust, and extending the upper end of the vacuumizing tube (2) out of the liquid injection port (13) for air exhaust;

quickly vacuumizing the soft packaging film bag (1) to more than negative 0.8MP through a vacuumizing tube (2);

fifthly, a lower sealing line (6) is thermally sealed by a heat sealing knife (3), and the lower sealing line is positioned below the lower end of the vacuumizing tube (2), so that the bag opening (12) and the liquid injection opening (13) are completely sealed;

and step six, taking out the vacuumizing tube (2) from the upper sealing line (5) to finish the primary sealing work of the flexible packaging film bag (1).

Technical Field

The invention relates to a sealing structure, in particular to a sealing structure of a liquid injection port of a soft package lithium battery and a manufacturing method thereof.

Background

As is well known, the structure of soft packet of lithium cell mainly comprises laminate polymer bag and the sack that sets up on the laminate polymer bag, and annotate liquid in to the laminate polymer bag through the sack, evacuation and sealing, because the sack is only the shaping between two diaphragms of laminate polymer bag, because two diaphragms thickness are thinner under the normality, often laminate each other and lead to the sack closed, so must open two diaphragms through extra mechanical equipment at the in-process of annotating liquid and evacuation and expose the sack, treat to annotate the liquid and accomplish the back, must transmit the laminate polymer bag that is equipped with electrolyte to special evacuation container in again and concentrate the evacuation back, carry out the sealing of sack again. Obviously, a special bag opening device, a vacuum-pumping device and a sealing device must be equipped in the manufacturing process, which not only complicates the production process and the production equipment, but also affects the production efficiency, and especially, the number of vacuum-pumping operations for soft-packed lithium batteries in the vacuum-pumping process is easily affected by the volume of the vacuum-pumping container, which also leads to the increase of the production cost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a sealing structure of a liquid injection port of a soft package lithium battery and a manufacturing method thereof, wherein the sealing structure can simplify the production process, reduce production equipment, improve the production efficiency and reduce the production cost.

The technical problem of the invention is realized by the following technical scheme:

the utility model provides a soft packet of lithium cell annotates liquid mouth sealing structure, includes the soft packet of membrane bag and sets up the sack on the soft packet of membrane bag, sack punishment separate out automatic open annotate the liquid mouth and insert the vacuum tube of annotating the liquid mouth, the sack is equipped with outward and seals the line and seal the line down with sealing the line down, should go up to seal the line will sack, annotate the liquid mouth and manage to find time the real pipe an organic whole and seal to make the interior evacuation of vacuum tube's lower extreme intercommunication soft packet of membrane bag become vacuum, the upper end of vacuum tube is stretched out and is annotated the liquid mouth exhaust, should seal the line down and treat that the soft packet of membrane bag seals the sack completely after the.

The bag opening is formed between two membranes of the soft-packaging membrane bag.

Two convex hulls which are convex inwards are arranged on each membrane, and the two convex hulls on the two membranes are correspondingly contacted and enclosed to form an automatic opening liquid injection port.

The two convex hulls on the two membranes are positioned below the lower sealing line.

The lower end of the vacuum tube is positioned between the upper sealing line and the lower sealing line.

The lower sealing line completely seals the bag opening and the liquid injection opening after the interior of the soft packaging film bag is vacuumized, and the vacuumizing tube is separated from the upper sealing line and taken out.

The upper sealing line is formed by sealing a sealing strip.

The lower sealing line is formed by clamping and heat-sealing a heat-sealing knife.

And the two convex hulls on each membrane are manufactured by a hot pressing process, and each convex hull is hemispherical.

A manufacturing method of a sealing structure of a liquid injection port of a soft package lithium battery comprises the following steps:

step one, making a soft packaging film bag with a reserved bag opening through a film, and manufacturing two convex hulls protruding inwards on each film forming the bag opening in a hot pressing mode, wherein the two convex hulls on the two films correspond to each other in position, and the two convex hulls on the two films are in contact with each other to form an automatic opening liquid injection opening in a surrounding mode;

conveying the soft packaging film bag to a liquid injection machine and a high-pressure liquid absorption machine, injecting electrolyte into the soft packaging film bag through an automatically opened liquid injection port by the liquid injection machine, and absorbing liquid by the high-pressure liquid absorption machine;

step three, after the electrolyte is injected into the soft-packaging film bag and the liquid absorption is finished, inserting the vacuumizing tube into the liquid injection port, sealing an upper sealing line through a sealing strip to integrally seal the bag opening, the liquid injection port and the vacuumizing vacuum tube, ensuring that the lower end of the vacuumizing tube can be communicated with the soft-packaging film bag for air exhaust, and extending the upper end of the vacuumizing tube out of the liquid injection port for air exhaust;

quickly vacuumizing the soft packaging film bag to be more than negative 0.8MP through a vacuum pipe;

step five, a lower sealing line is thermally sealed by a heat sealing knife, and the lower sealing line is positioned below the lower end of the vacuumizing tube, so that the bag opening and the liquid injection opening are completely sealed;

and step six, separating the vacuumizing tube from the upper sealing line and taking out the vacuumizing tube to finish the primary sealing work of the flexible packaging film bag.

Compared with the prior art, the invention mainly separates the liquid filling port and the vacuum tube inserted into the liquid filling port at the bag opening, the bag opening is externally provided with an upper sealing line and a lower sealing line, the bag opening, the liquid filling port and the vacuum tube are sealed into a whole through the upper sealing line, so that the lower end of the vacuum tube can be communicated with the soft packaging film bag for air exhaust, the upper end of the vacuum tube can extend out of the liquid filling port for air exhaust, the interior of the soft packaging film bag can be quickly vacuumized, and the lower sealing line is used for completely sealing the bag opening and the liquid filling port after the interior of the soft packaging film bag is vacuumized, thereby completing the primary sealing work of the soft packaging film bag. Obviously, the trouble of increasing a bag opening device can be avoided by separating an automatic opening liquid injection port at the bag opening for liquid injection, the trouble of increasing a vacuumizing device can be solved in the vacuumizing process by vacuumizing the soft package film bag through a vacuumizing tube, the number of the soft package lithium batteries which are vacuumized at one time cannot be limited, and the production process can be greatly simplified, the production equipment can be reduced, and the production efficiency can be improved through the improvement; simultaneously, only need utilize the simple design of sealing the line on with sealing the line down, just can satisfy the evacuation pipe to the interior evacuation's of flexible packaging film bag needs, can also make the flexible packaging film bag totally enclosed after the evacuation to the manufacturing cost of better reduction flexible packaging lithium cell.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a sectional view taken along line B-B of fig. 1.

Fig. 4 is a schematic view of the structure of the heat-seal-removing knife shown in fig. 1.

Fig. 5 is a schematic structural view of the soft film bag without an upper sealing line and a lower sealing line.

Fig. 6 is an enlarged top view of fig. 5.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the above drawings.

As shown in fig. 1 to 6, the bag comprises 1 a soft packaging film bag, 11 a film sheet, 12 a bag opening, 13 a liquid filling opening, 2 a vacuum pumping pipe, 3 a heat sealing knife, 4 a convex hull, 5 an upper sealing line, 6 a lower sealing line and 7 a sealing strip.

The utility model provides a soft packet of lithium cell annotates liquid mouth seal structure and manufacturing method thereof, as shown in fig. 1-3, the mainly used soft packet of lithium cell annotates the mouth seal of liquid mouth, this soft packet of lithium cell has a soft packet of membrane bag 1, and soft packet of membrane is by the fifty percent discount back of a rectangular diaphragm 11, seal both sides and leave sack 12 at the top, the sack 12 that also sets up on soft packet of membrane bag 1 is the shaping between two diaphragms 11 of soft packet of membrane bag 1, and automatic open notes liquid mouth 13 of still keeping apart and insert the evacuation pipe 2 of annotating the liquid mouth in sack 12 department.

The specific structure is shown in fig. 5 and 6: each membrane 11 forming the bag opening 12 is provided with two convex hulls 4 protruding inwards, the two convex hulls 4 are manufactured on each membrane 11 by a hot pressing process, each convex hull 4 is hemispherical, the two convex hulls 4 on the two membranes 11 just correspond in position, and when the hemispherical tops of the convex hulls 4 are contacted with each other, the convex hulls just enclose to form the automatic opening liquid filling opening 13.

Meanwhile, an upper sealing line 5 and a lower sealing line 6 as shown in fig. 4 are arranged outside the bag opening 12, the upper sealing line 5 is formed by sealing a sealing strip 7, and the lower sealing line 6 is formed by clamping and heat-sealing the lower sealing line by a heat-sealing knife 3.

The lower end of the vacuum tube 2 is positioned between an upper sealing line 5 and a lower sealing line 6, a bag opening 12, a liquid injection opening 13 and a vacuum pumping tube 2 can be integrally sealed through a sealing strip 7 forming the upper sealing line 5, the lower end of the vacuum tube 2 is communicated with the soft packaging film bag 1 to be pumped, and the upper end of the vacuum tube 2 extends out of the liquid injection opening 13 to be exhausted; therefore, the soft packaging film bag 1 can be quickly vacuumized only by the vacuumizing tube 2.

And the lower sealing line 6 is used for completely sealing the bag opening 12 and the liquid injection opening 13 through heat sealing after the interior of the flexible packaging film bag 1 is vacuumized so as to complete the primary sealing work of the flexible packaging film bag 1, so that the two convex hulls 4 on the two membranes 11 are usually arranged below the lower sealing line 6.

In addition, the lower sealing line 6 completely closes the bag opening 12 and the liquid injection opening 13 after the soft packaging film bag 1 is vacuumized, and the vacuum-pumping tube 2 is usually taken out from the upper sealing line 5.

The manufacturing method of the sealing structure of the liquid injection port of the soft package lithium battery comprises the following steps:

step one, a soft packaging film bag 1 with a reserved bag opening 12 is manufactured through a film 11, two convex hulls 4 protruding inwards are manufactured on each film 11 forming the bag opening 12 in a soaking and pressing mode, the two convex hulls 4 on the two films 11 correspond to each other in position, and the two convex hulls 4 on the two films 11 are in contact with each other and just enclose to form an automatic opening liquid injection opening 13;

step two, conveying the flexible packaging film bag 1 to a liquid injection machine and a high-pressure liquid absorption machine, injecting electrolyte into the flexible packaging film bag 1 through an automatically opened liquid injection port 13 by the liquid injection machine, and absorbing liquid by the high-pressure liquid absorption machine;

step three, after the electrolyte is injected into the soft packaging film bag 1 and the liquid absorption is finished, inserting the vacuum tube 2 into the liquid injection port 13, sealing the upper sealing line 5 through the sealing strip 7, so as to integrally seal the bag opening 12, the liquid injection port 13 and the vacuum evacuation tube 2, ensuring that the lower end of the vacuum tube 2 can be communicated with the soft packaging film bag 1 for air evacuation, and extending the upper end of the vacuum tube 2 out of the liquid injection port 13 for air evacuation;

step four, rapidly vacuumizing the soft packaging film bag 1 to be more than negative 0.8MP through a vacuumizing tube 2;

step five, a lower sealing line 6 is thermally sealed by a heat sealing knife 3, and the lower sealing line is positioned below the lower end of the vacuumizing tube 2, so that the bag opening 12 and the liquid injection opening 13 are completely sealed;

and step six, taking out the vacuumizing tube 2 from the upper sealing line 5 to finish the primary sealing work of the flexible packaging film bag 1.

The invention separates the automatic opening liquid filling port 13 from the bag port 12 to fill liquid, which can avoid the trouble of increasing the bag port opening device, and uses the vacuum tube 2 to vacuumize the soft-package film bag 1, so that the trouble of increasing the vacuum device can be solved in the vacuum process, and the vacuum can not be limited by the vacuum amount of the soft-package lithium battery in one time, and the improvement can greatly simplify the production process, reduce the production equipment and improve the production efficiency; and, only need utilize the simple design of sealing line 5 and sealing line 6 down on, just can satisfy evacuation pipe 2 to the interior evacuation's of flexible packaging film bag 1 needs, can also make flexible packaging film bag 1 totally enclosed after the evacuation to the manufacturing cost of better reduction flexible packaging lithium cell.

The above description is only a specific embodiment of the present invention, and those skilled in the art should understand that any similar structural design to the embodiment is included in the protection scope of the present invention.