CN114421038B

CN114421038B - Battery cell sealing assembly, battery, electric equipment and battery cell sealing method

Info

Publication number: CN114421038B
Application number: CN202210323203.9A
Authority: CN
Inventors: 王新蕾; 尚方泽; 晏星; 殷科
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-06-17
Anticipated expiration: 2042-03-30
Also published as: CN114421038A

Abstract

The application discloses a battery cell sealing assembly, a battery, electric equipment and a battery cell sealing method. The shell is provided with a communicated containing cavity and a first hole. The sealing plug comprises a connecting wall and an elastic wall, the connecting wall is connected with the hole wall of the first hole in a sealing mode, and the elastic wall comprises a guide portion and a folding portion. The guide part and the folding part are surrounded to form a first concave part communicated with the accommodating cavity, the radial size of the first concave part along the first hole is gradually reduced along the first direction, and a second concave part is arranged on one side, deviating from the first concave part, of the sealing plug. The folding part is folded to isolate the first concave part and the second concave part, and is opened when the force acting on the inner surface of the folding part is larger than the force acting on the outer surface of the folding part to communicate the first concave part and the second concave part, and the sealing cover covers the sealing plug and is connected with the shell in a sealing way to isolate the second concave part from the outside of the cavity in a sealing way. The closure in this application is favorable to being in sealed casing under the negative pressure state inside the casing.

Description

Battery cell sealing assembly, battery, electric equipment and battery cell sealing method

Technical Field

The application relates to the technical field of energy storage, in particular to a battery cell sealing assembly, a battery, electric equipment and a battery cell sealing method.

Background

In the process of packaging the battery cell, if air is packaged in the shell, the quality and the service life of the battery cell can be influenced. Therefore, in the process of cell encapsulation, it is necessary to exhaust air inside the casing and then seal the casing, so as to reduce the influence on the quality and the service life of the cell.

At present, can enclose into the cavity with optical glass, to cavity evacuation formation vacuum environment, place the whole electric core subassembly in vacuum cavity, annotate the liquid hole at the notes liquid of casing and annotate the liquid, the rethread module of rectifying is arranged sealed nail in annotating the liquid hole, then sees through optical glass through the laser and welds sealed nail in the cavity to this reduces the inside air content of casing in sealed process. However, the positioning difficulty exists when the battery cell is placed in a vacuum environment for sealing, the electrolyte of the battery cell is subjected to negative pressure to generate overflow when the battery cell is in the vacuum environment for a long time, the service life of equipment such as a deviation correcting device for installing a sealing piece is shortened in the vacuum environment, laser penetrates through optical glass to weld a sealing nail in a vacuum cavity, the laser light path is refracted, the precision control difficulty is high, and the like.

Disclosure of Invention

In view of the above, it is desirable to provide a cell sealing assembly that facilitates negative pressure sealing of a cell.

In a first aspect of the present application, a cell sealing assembly is provided, which includes a casing, a sealing plug, and a sealing cover. The shell is provided with an accommodating cavity and a first hole, the first hole is communicated with the accommodating cavity, and gas in the accommodating cavity can be discharged from the accommodating cavity through the first hole along a first direction. The sealing plug sets up in first hole, and the sealing plug includes connecting wall and elastic wall, connecting wall and the pore wall sealing connection in first hole, and the elastic wall includes guide part and closure portion, and the guide part is connected with the connecting wall, and closure portion sets up in the one side that the guide part deviates from the connecting wall. The guide part and the folding part are arranged in a surrounding mode to form a first concave part, the first concave part is communicated with the accommodating cavity, the radial size of the first concave part along the first hole is gradually reduced along the first direction, the connecting wall and the elastic wall are arranged in a surrounding mode to form a second concave part, and the second concave part is located on one side, away from the first concave part, of the sealing plug. The folding part is folded to separate the first concave part and the second concave part in a sealing way, and is opened when the force acting on the inner surface of the folding part is larger than the force acting on the outer surface of the folding part so as to communicate the first concave part and the second concave part. The sealing cover covers the sealing plug and is connected with the shell in a sealing mode so as to seal the second concave part from the outside of the cavity.

Above-mentioned sealing plug makes electric core in the packaging process, and the casing accomplishes the sealed process of exhaust automatically in the environment of evacuation, reduces the use that is used for devices such as location, sealing in vacuum environment, has improved the sealed convenience of casing, has promoted the efficiency of sealed operation, has still saved the cost, and sealed second concave part of lid makes the battery will hold the chamber internal and external seal and keep apart in the use.

In some embodiments, the fold decreases in size in a radial direction of the first aperture in the first direction. One side of the folding part, which is far away from the guide part, is easier to deform compared with one side of the folding part, which is close to the guide part, so that the inner surface of the folding part can be attached more tightly when the folding part is in a folding state, and the sealing performance of the sealing plug is enhanced.

In some embodiments, the thickness of the guiding portion is greater than the thickness of the folding portion along the first direction. The elastic force of the guide part can be enhanced, so that the force of the closure part during closure is favorably improved, and the sealing performance of the sealing plug is enhanced.

In some embodiments, the housing further has a first groove located outside the cavity and communicating with the first hole, and the sealing plug further includes a positioning portion connected to the connecting wall and mounted in the first groove. The risk that the sealing plug falls into the holding cavity can be reduced, the installation of the sealing plug can be facilitated, and the fool-proof effect is achieved.

In some embodiments, in the first direction, neither the connecting wall nor the positioning portion extends beyond the housing. The space occupied by the whole battery cell can be reduced, and a structure for plugging the sealing plug is conveniently arranged on the shell.

In some embodiments, the outer diameter of the connecting wall gradually increases along the first direction, and the first hole is disposed to fit with the connecting wall. The hole wall of the first hole can play a role in preventing the sealing plug from sinking into the cavity, and the risk that the sealing plug sinks into the cavity is reduced.

In some embodiments, the height of the sealing plug is H and the thickness of the housing is D along the first direction, such that 0.5D ≦ H ≦ 2D. The contact area between the sealing plug and the wall of the first hole can be increased, and the sealing effect of the containing cavity and the fixing effect of the sealing plug can be enhanced.

In some embodiments, the sealing cover comprises a first wall and a second wall which are arranged from outside to inside, the first wall is connected with the shell, and the second wall is attached to one side, away from the first concave part, of the connecting wall and the elastic wall. The gap between the sealing cover and the sealing plug can be reduced, and the sealing effect on the accommodating cavity is improved.

In some embodiments, a side of the sealing cover facing the housing is provided with a protrusion, which fits within the second recess. The joint effect between the sealing cover and the sealing plug can be improved, and the sealing performance is further improved.

In a second aspect of the present application, there is also provided a battery, which includes the cell sealing assembly in any one of the above embodiments.

The third aspect of the present application further provides an electrical apparatus, where the electrical apparatus includes an apparatus main body and a battery cell, and the battery cell is installed in the apparatus main body.

In a fourth aspect of the present application, a method for sealing a battery cell is further provided, which includes: the sealing plug is installed in the first bore of the housing and seals the cavity. And placing the shell in a vacuum box, vacuumizing the vacuum box, and exhausting gas in the cavity through the sealing plug until the sealing plug reseals the cavity. The housing is removed from the vacuum box.

The battery cell sealing method saves time and labor for operations such as exhausting and sealing the shell, is simple and convenient to operate, saves the use of devices for positioning, sealing and the like in a vacuum environment, and improves the sealing operation efficiency.

In some embodiments, after removing the housing from the vacuum box, the method further comprises: the sealing cover is connected with the shell and covers the sealing plug.

When the shell is in an environment with air pressure lower than that in the accommodating cavity, the folding part is opened to discharge air in the accommodating cavity until the air pressure inside and outside the accommodating cavity is balanced, and the folding part is folded again to enable the inside and the outside of the accommodating cavity to be sealed and isolated. The sealing effect of the folding part can prevent air, dirty liquid, ash layers, scraps and the like outside the accommodating cavity from entering the accommodating cavity, the sealing plug enables the shell to automatically complete the exhaust sealing process in the vacuumizing environment, the use of devices for positioning, sealing and the like in the vacuum environment is reduced, the convenience of shell sealing is improved, the efficiency of sealing operation is improved, and the cost is also saved.

Drawings

Fig. 1 is an exploded schematic view of a cell sealing assembly according to an embodiment of the present application.

Fig. 2 is a cross-sectional view of a cell sealing assembly according to an embodiment of the present application.

Fig. 3 is a cross-sectional view of a cell sealing assembly according to an embodiment of the present application.

Fig. 4 is a view of the cell sealing assembly of fig. 3 in a venting state.

Fig. 5 is a schematic structural diagram of a sealing plug provided in an embodiment of the present application.

Fig. 6 is a cross-sectional view of a cell seal assembly provided in an embodiment of the present application.

Fig. 7 is a schematic diagram of a battery according to an embodiment of the disclosure.

Fig. 8 is a schematic diagram of an electric device according to an embodiment of the present application.

Fig. 9 is a flowchart of a cell sealing method provided in an embodiment of the present application.

Description of the main element symbols: the battery cell sealing assembly 1, the casing 10, the accommodating cavity 11, the first hole 12, the first groove 13, the sealing plug 20, the connecting wall 21, the elastic wall 22, the guiding part 221, the folding part 222, the outer surface 2221, the inner surface 2222, the first concave part 23, the positioning part 24, the second concave part 25, the second hole 26, the sealing cover 30, the first wall 31, the second wall 32, the protrusion 33, the second groove 34, the battery 100, the device main body 200, the electric device 1000, the first direction Z and the second direction R.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "rear," and the like as used herein are for illustrative purposes only.

The term "vertical" is used to describe an ideal condition between two components. In a state of actual production or use, a state of approximately vertical may exist between the two components. For example, in combination with numerical descriptions, vertical may refer to an angle between two straight lines ranging from 90 ± 10 °, vertical may also refer to a dihedral angle between two planes ranging from 90 ° ± 10 °, and vertical may also refer to an angle between a straight line and a plane ranging from 90 ± 10 °. Two components described as "perpendicular" may not be absolutely straight, planar, or may be substantially straight or planar, and a component may be considered "straight" or "planar" when viewed macroscopically as if the overall direction of extension were straight or planar.

The term "parallel" is used to describe an ideal condition between two components. In a state of actual production or use, a state of approximately parallel may exist between the two components. For example, in connection with numerical descriptions, parallel may refer to an angle between two straight lines ranging from 180 ° ± 10 °, parallel may also refer to a dihedral angle between two planes ranging from 180 ° ± 10 °, parallel may also refer to an angle between a straight line and a plane ranging from 180 ° ± 10 °. Two components described as "parallel" may not be absolutely straight, planar, or may be substantially straight or planar, and a component may be considered "straight" or "planar" when viewed macroscopically as if the overall direction of extension were straight or planar.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The application discloses electric core seal assembly, electric core seal assembly include casing, sealing plug and sealed lid. The shell is provided with an accommodating cavity and a first hole, the first hole is communicated with the accommodating cavity, and gas in the accommodating cavity can be discharged from the accommodating cavity through the first hole along a first direction. The sealing plug sets up in first hole, and the sealing plug includes connecting wall and elastic wall, connecting wall and the pore wall sealing connection in first hole, and the elastic wall includes guide part and closure portion, and the guide part is connected with the connecting wall, and closure portion sets up in the one side that the guide part deviates from the connecting wall. The guide part and the folding part are surrounded to form a first concave part, the first concave part is communicated with the accommodating cavity, the radial size of the first concave part along the first hole is gradually reduced along the first direction, the connecting wall and the elastic wall are surrounded to form a second concave part, and the second concave part is positioned on one side of the sealing plug, which deviates from the first concave part. The folding part is folded to seal and separate the first concave part and the second concave part, and is opened when the force acting on the inner surface of the folding part is larger than the force acting on the outer surface of the folding part to communicate the first concave part and the second concave part, so that the air exhaust and the sealing of the shell are facilitated in the packaging process of the battery. The sealing cover covers the sealing plug and is connected with the shell in a sealing mode so as to seal the second concave part from the outside of the cavity.

Above-mentioned sealing plug makes electric core in packaging process, and the casing is automatic accomplishes the sealed process of exhausting in the environment of evacuation, reduces the use that is used for devices such as location, sealing in vacuum environment, has improved the convenience of casing seal, has promoted the efficiency of sealed operation, has still saved the cost, and sealed lid seals the second concave part, makes the battery will hold the intracavity external seal and keep apart in the use.

Some embodiments of the present application will be described below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 and fig. 2, a cell sealing assembly 1 is provided in an embodiment of the present application, where the cell sealing assembly 1 includes a casing 10 and a sealing plug 20. The sealing plug 20 is used for sealing the housing 10, the sealing plug 20 is influenced by the difference between the internal pressure and the external pressure of the housing 10, when the internal pressure of the housing 10 is greater than the external pressure, the sealing plug 20 can be opened, when the sealing plug 20 is opened, the gas in the housing 10 is discharged, and after the gas in the housing 10 is discharged, the sealing plug 20 is closed, so that the interior of the housing 10 and the exterior of the housing 10 are sealed and isolated.

Referring to fig. 2, the housing 10 is provided with a cavity 11, and the cavity 11 is used for accommodating a battery cell, where the battery cell includes a cathode plate, an anode plate, a diaphragm located between the cathode plate and the anode plate, and an electrolyte. The housing 10 is further provided with a first hole 12, and the first hole 12 communicates the cavity 11 with the housing 10 or an external space of the cavity 11.

Optionally, the housing 10 is made of a material such as hard plastic or metal, and the deformation of the housing 10 after the air is exhausted from the cavity 11 is suppressed.

The sealing plug 20 comprises a connecting wall 21 and an elastic wall 22, wherein the connecting wall 21 is clamped in the first hole 12, so that the connecting wall 21 is in sealing connection with the wall of the first hole 12, and the sealing plug 20 is arranged in the first hole 12. In one embodiment, the walls of the first bore 12 are coated with a sealant, and the connecting wall 21 is sealingly connected to the walls of the first bore 12 by the sealant. Optionally, the sealant may be an acrylate sealant, an epoxy sealant, or a silicone sealant, etc. In one embodiment, the connecting wall 21 is annular and resilient. In one embodiment, the connecting wall 21 is fixed to the first hole 12 by interference fit.

The elastic wall 22 includes a guide portion 221 and a folding portion 222, both the guide portion 221 and the folding portion 222 have elasticity, the guide portion 221 is connected to the connecting wall 21 and located inside the connecting wall 21, and the folding portion 222 is disposed on one side of the guide portion 221. The guiding portion 221 and the connecting wall 21 may be connected by pressing, bonding or integrally molding.

In one embodiment, the guiding portion 221, the folding portion 222 and the connecting wall 21 may be made of rubber or silicone. In one embodiment, the guiding portion 221, the folding portion 222 and the connecting wall 21 are integrally formed by injection molding or injection molding.

The folded portion 222 extends along the direction in which the guide portion 221 departs from the connecting wall 21, and also extends along the first direction Z, which is a direction from inside the cavity 11 toward outside the cavity 11, to form a folded state. The guide portion 221 and the folding portion 222 are surrounded to form a first concave portion 23, the first concave portion 23 is communicated with the cavity 11, and the size of the first concave portion 23 along a second direction R is gradually reduced along a first direction Z, and the second direction R is perpendicular to the first direction Z. In one embodiment, the first hole 12 is a circular hole, and the second direction R is a radial direction of the first hole 12.

Referring to fig. 3 and 4, the folding portion 222 has an inner surface 2222 communicated with the cavity 11 and an outer surface 2221 communicated with the outside of the cavity 11, and in a natural state, due to an elastic effect, a part of the inner surface 2222 of the folding portion 222 is attached to each other to form a folded state, so that the inside of the cavity 11 is separated from the outside of the cavity 11. When a force applied to the inner surface 2222 of the folded part 222 is greater than a force applied to the outer surface 2221 of the folded part 222, the folded part 222 is opened to form the second hole 26, so that the first recess 23 is communicated with the outside of the cavity 11, and thus the inside of the cavity 11 is communicated with the outside of the cavity 11.

In some embodiments, referring to fig. 3 and 4, the thickness of the guiding portion 221 is greater than the thickness of the closing portion 222 along the first direction Z, so as to enhance the elastic force of the guiding portion 221, thereby facilitating to increase the force when the closing portion 222 is closed, and enhancing the sealing performance of the sealing plug 20.

In some embodiments, referring to fig. 3 and 4, along the first direction Z, the size of the folded part 222 along the second direction R is gradually decreased, so that a side of the folded part 222 away from the guiding part 221 is more easily deformed than a side of the folded part 222 adjacent to the guiding part 221, and when the folded part 222 is in the folded state, the inner surface 2222 of the folded part 222 can be more tightly attached and the attaching area is more, thereby enhancing the sealing performance of the sealing plug 20.

In some embodiments, referring to fig. 3 to 5, the sealing plug 20 further includes a positioning portion 24, and the positioning portion 24 is connected to the connecting wall 21 and located outside the cavity 11. The locating portion 24 contacts the housing 10 and reduces the risk of trapping the bore seal 20 in the cavity 11. Optionally, glue may be provided between the positioning portion 24 and the housing 10 to bond the positioning portion 24 and the housing 10, thereby improving the stability of the installation of the sealing plug 20.

In some embodiments, referring to fig. 1 and 5, the housing 10 further has a first groove 13, and the first groove 13 is located outside the cavity 11 and is communicated with the first hole 12. The positioning portion 24 is mounted in the first groove 13, so that the sealing plug 20 can be conveniently mounted, and a fool-proof effect is achieved. In some embodiments, along the first direction Z, the connection wall 21 and the positioning portion 24 do not exceed the casing 10, so that the space occupied by the whole cell sealing assembly 1 can be reduced, and a structure for plugging the sealing plug 20 is conveniently further provided on the casing 10, so as to further enhance sealing.

In some embodiments, referring to fig. 3 to 5, the positioning portion 24 is annular, and the shape of the first groove 13 is adapted to the positioning portion 24, so as to improve the mounting stability of the sealing plug 20 and reduce the risk of the sealing plug 20 breaking away from the first hole 12.

In other embodiments, referring to fig. 6, the positioning portion 24 may be omitted, and the outer diameter of the connecting wall 21 is gradually increased along the first direction Z, and the first hole 12 is disposed in the connecting wall 21. This arrangement allows the wall of the first bore 12 to act as a stop for the bore seal 20 from sinking into the cavity 11, reducing the risk of the bore seal 20 sinking into the cavity 11.

In some embodiments, referring to FIG. 4, the height of the sealing plug 20 is H and the thickness of the housing 10 is D along the first direction Z, such that 0.5D ≦ H ≦ 2D. When the height H of the sealing plug 20 is within this range, the contact area between the sealing plug 20 and the wall of the first hole 12 can be increased, and the sealing effect on the cavity 11 and the fixing effect of the sealing plug 20 can be enhanced.

The present application places the housing 10 in an environment where the air pressure is lower than the air pressure in the cavity 11, and when the acting force is able to overcome the elastic force of the folded part 222, the folded part 222 can be caused to open to form the second hole 26. After the folding part 222 is opened, due to the pressure difference between the inside and the outside of the cavity 11, the gas in the cavity 11 is discharged through the second hole 26 until the pressure inside and outside the cavity 11 is balanced, and the folding part 222 is folded again, so that the inside and the outside of the cavity 11 are sealed and isolated. Subsequently, the housing 10 is placed in normal ambient air pressure, and the air pressure in the housing 10 is lower than the normal ambient air pressure, so that the outer surface 2221 of the folded portion 222 is acted by an acting force, the inner surface 2222 of the folded portion 222 is attached more tightly, the sealing effect is enhanced, and the sealing effect of the folded portion 222 can prevent air, dirty liquid, ash, scraps and the like outside the cavity 11 from entering the cavity 11. This application makes casing 10 accomplish the sealed process of exhaust automatically in the environment of evacuation, reduces the use that is used for devices such as location, sealing in vacuum environment, has improved the sealed convenience of casing 10, has promoted the efficiency of sealed operation, has still saved the cost.

In some embodiments, referring to fig. 1 and fig. 2, the cell sealing assembly 1 further includes a sealing cover 30, and the sealing cover 30 is connected to the housing 10 in a sealing manner and covers the sealing plug 20 to completely seal the inside and outside of the cavity 11. The sealing cover 30 covers the sealing plug 20, so that the risk of sealing failure caused by collision of the sealing plug 20 in the transportation and installation processes of the shell 10 can be reduced, the risk of the sealing plug 20 being separated from the first hole 12 is also reduced, the sealing plug 20 is protected, and the sealing time of the sealing cover 30 can be prolonged and the sealing effect on the accommodating cavity 11 is improved.

The housing 10 may be hermetically connected to the sealing cap 30 by an adhesive connection, a welding connection, a screw connection, or the like. Illustratively, the sealing cover 30 is welded to the housing 10, and the welding connection may be laser welding or ultrasonic welding, and the welding has the advantages of stable connection, good sealing effect, and the like.

In some embodiments, referring to fig. 2, the sealing cover 30 includes a first wall 31 and a second wall 32 arranged from outside to inside, the first wall 31 is connected with the housing 10, and the second wall 32 is attached to the connecting wall 21 and the side of the elastic wall 22 away from the first recess 23, so that the gap between the sealing cover 30 and the sealing plug 20 can be reduced, and the sealing effect on the cavity 11 can be improved.

In some embodiments, referring to fig. 2, the side of the sealing plug 20 facing away from the first recess 23 is provided with a second recess 25, and the second recess 25 is defined by the connecting wall 21 and the elastic wall 22. In some embodiments, the sealing cover 30 is provided with a protrusion 33 on a side facing the housing 10, and the protrusion 33 is installed in the second recess 25, so that the fitting effect between the sealing cover 30 and the sealing plug 20 can be improved, and the sealing performance can be further improved.

In some embodiments, referring to fig. 2, a second groove 34 is further formed on a side of the sealing cover 30 facing away from the protrusion 33, and the second groove 34 may serve to reduce weight. Alternatively, the second groove 34 may be provided as a circular groove, a square groove, a hexagonal groove, or the like. The second groove 34 may be used to cooperate with an operating mechanism of other equipment, for example, a robot arm working end is provided with a suction block (not shown), and the suction block cooperates with the second groove 34 to facilitate the robot arm to pick up, suck and move the sealing cover 30.

Referring to fig. 7, a battery 100 is also provided in an embodiment of the present application, where the battery 100 includes any embodiment of the cell sealing assembly 1. Since the battery 100 adopts the technical solution of any embodiment of the cell sealing assembly 1, the battery at least has the beneficial effects brought by the technical solution of any embodiment of the cell sealing assembly 1, and details are not repeated herein.

Referring to fig. 8, an electric device 1000 is further provided in the embodiment of the present application, where the electric device 1000 includes a device main body 200 and the battery 100, and since the electric device 1000 adopts the technical solution of the embodiment of the battery 100, the electric device has at least the beneficial effects brought by the technical solution of the embodiment of the battery 100, and the battery 100 is installed in the device main body 200 to supply power to the device main body 200.

The electric device 1000 in the present application can be, but is not limited to, a mobile phone, a clock, an illumination lamp, a calculator, an earphone, an electronic book player, a toy, a game machine, a video recorder, a notebook computer, a tablet computer, a portable phone, a portable CD player, an electronic notebook, a portable recorder, a radio, etc.

Referring to fig. 9, an embodiment of the present application further provides a cell sealing method. The cell sealing method comprises the following steps:

the sealing plug 20 is installed into the first hole 12 of the housing 10. The housing 10 is placed in a vacuum box (not shown), and the vacuum box is evacuated to open the sealing plug 20 and exhaust the gas in the cavity 11 until the sealing plug 20 closes to seal the cavity 11, so that the cavity 11 of the housing 10 is sealed from the outside. The sealing action of the sealing plug 20 is enhanced by moving the housing 10 out of the vacuum box.

The battery cell sealing method saves time and labor for operations such as exhausting and sealing the shell 10, is simple and convenient to operate, saves the devices for positioning, sealing and the like in a vacuum environment, and improves the sealing operation efficiency.

In some embodiments, removing the housing 10 from the vacuum box further comprises: by connecting the sealing cover 30 to the housing 10 and closing the sealing plug 20, the sealing effect on the cavity 11 can be further enhanced, and the sealing duration can be increased.

In some embodiments, the housing 10 may be fixed during the step of installing the sealing plug 20, and the sealing plug 20 may be installed in the first hole 12 using an automated device such as a robotic arm.

In some embodiments, the housing 10 is further provided with a first groove 13, the sealing plug 20 is provided with a locating portion 24, and after the sealing plug 20 is installed, the risk of the sealing plug 20 disengaging from the first hole 12 is reduced by pressing the locating portion 24 into the first groove 13.

In some embodiments, the vacuum box may be configured to include a box body and a lid, and the housing 10 is secured to the lid and the housing 10 is inserted into the vacuum box when the lid is closed. In the step of removing the battery from the vacuum environment, the battery 100 can be removed from the evacuated vacuum box by opening the lid.

In some embodiments, automated equipment may be used to install and weld the seal cap 30 when installing the seal cap 30. Through installing a plurality of casings 10 on the lid of vacuum box, can once only place into same vacuum box with a plurality of casings 10, to a vacuum box evacuation can accomplish the exhaust and the sealed of a plurality of casings 10, install sealed lid 30 on a plurality of casings 10 one by one through automation equipment afterwards, be favorable to sealing 100 batched, improve the productivity.

In addition, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present application, and that suitable changes and modifications to the above embodiments are within the scope of the present disclosure as long as they are within the spirit and scope of the present application.

Claims

1. A cell seal assembly, comprising:

the gas-liquid separator comprises a shell, a first liquid-liquid separator and a second liquid-liquid separator, wherein the shell is provided with a containing cavity and a first hole, the first hole is communicated with the containing cavity, and gas in the containing cavity can be discharged out of the containing cavity through the first hole along a first direction;

the sealing plug is arranged in the first hole and comprises a connecting wall and an elastic wall, the connecting wall is connected with the hole wall of the first hole in a sealing mode, the elastic wall comprises a guide part and a folding part, the guide part is connected with the connecting wall, and the folding part is arranged on one side, away from the connecting wall, of the guide part;

the guide part and the folding part are arranged in an enclosing mode to form a first concave part, the first concave part is communicated with the containing cavity, the size of the first concave part along the radial direction of the first hole is gradually reduced along the first direction, the connecting wall and the elastic wall are arranged in an enclosing mode to form a second concave part, and the second concave part is located on one side, away from the first concave part, of the sealing plug;

the folding part is folded to separate the first concave part from the second concave part and is opened to communicate the first concave part with the second concave part when the force acting on the inner surface of the folding part is larger than the force acting on the outer surface of the folding part;

the battery cell sealing assembly further comprises a sealing cover, and the sealing cover covers the sealing plug and is connected with the shell in a sealing mode so as to seal and isolate the second concave part from the outside of the accommodating cavity.

2. The cell seal assembly according to claim 1, wherein the fold decreases in size in a radial direction of the first aperture in the first direction.

3. The cell sealing assembly according to claim 1, wherein the housing further has a first groove located outside the cavity and communicating with the first hole, and the sealing plug further includes a positioning portion connected to the connecting wall and mounted in the first groove.

4. The cell seal assembly according to claim 3, wherein neither the connecting wall nor the positioning portion extends beyond the housing in the first direction.

5. The cell seal assembly according to claim 1, wherein the connection wall has an outer diameter that gradually increases along the first direction, and the first hole is disposed to fit with the connection wall.

6. The cell sealing assembly according to claim 1, wherein along the first direction, the height of the sealing plug is H, the thickness of the casing is D, and 0.5D ≦ H ≦ 2D.

7. The cell sealing assembly according to claim 1, wherein the sealing cover comprises a first wall and a second wall arranged from outside to inside, the first wall is connected with the casing, and the second wall is attached to the connecting wall and one side of the elastic wall, which is away from the first concave portion.

8. The cell seal assembly according to claim 1, wherein a side of the seal cover facing the casing is provided with a protrusion, the protrusion being mounted in the second recess.

9. A battery comprising a cell seal assembly according to any one of claims 1 to 8.

10. An electric device characterized by comprising a device main body and the battery according to claim 9, the battery being mounted to the device main body.

11. A cell sealing method using the cell sealing assembly according to any one of claims 1 to 8, comprising the steps of:

installing the sealing plug into the first bore of the housing and sealing the cavity;

placing the shell in a vacuum box, vacuumizing the vacuum box, and exhausting gas in the cavity through the sealing plug until the sealing plug reseals the cavity;

removing the housing from the vacuum box.