CN215342752U - Simple and easy type lithium cell tip sealing structure - Google Patents

Abstract

The utility model discloses a simple lithium battery end sealing structure, which comprises a shell, an electric core, a current collector and the like, wherein a current collecting cover is additionally arranged outside the current collector, the inner end face of the current collecting cover is tightly sealed and attached to the outer end face of the current collector, an inner supporting ring and an outer supporting ring are arranged on the outer end face of the current collecting cover and are fixed by an inner supporting ring and a boss, and the outer supporting ring is fixed with the shell, so that the current collecting cover is pressed to seal the end of a lithium battery. Obviously, the sealing and sealing of the end part of the lithium battery are respectively carried out through two structures, so that circumferential welding is not needed, the inner support ring and the lug boss as well as the outer support ring and the battery shell can be fixed, and the requirement of a welding process is greatly reduced; meanwhile, the structural design is simpler, and by combining a corresponding manufacturing method, the welding time can be saved, the manufacturing efficiency can be improved, welding leakage points can be avoided, the pollution of welding protective gas to the environment can be reduced, and the like; meanwhile, the manufacturing cost of the lithium battery is greatly reduced due to the manufacturing mode without circumferential welding.

Description

Simple and easy type lithium cell tip sealing structure

Technical Field

The utility model relates to a lithium battery end sealing structure, in particular to a simple lithium battery end sealing structure.

Background

At present, the end part sealing is needed in the production and manufacturing process of the lithium battery, specifically, a current collecting piece is installed at the end part of a shell to seal a battery cell in the shell, and then the current collecting piece and the battery cell are conducted; meanwhile, a current collecting ring is required to be arranged on the current collecting piece, the current collecting ring and the shell are required to be circumferentially welded, sealed and fixed so as to seal the current collecting piece, and finally, after an insulating cover is placed on the current collecting ring, the current collecting ring is pressed and fixed through a rolling opening on the outer edge of the shell so as to finish end sealing. Obviously, the sealing structure of the end part of the lithium battery is not only complex in design, but also can seal the current collecting ring of the closed current collecting piece only by circumferential welding, namely, the connection and the sealing are simultaneously undertaken by the circumferentially welded current collecting ring, so that the requirement on a welding process is higher, and the sealing structure has the use defects of long welding time, low manufacturing efficiency, easy existence of welding leakage points, welding protective gas pollution environment and the like; meanwhile, the circumferential welding mode needs to be provided with a special laser welding machine, and the manufacturing cost of the lithium battery is increased.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a simple sealing structure for sealing the end of a lithium battery by a simple structural design without circumferential welding.

The technical problem of the utility model is realized by the following technical scheme:

the utility model provides a simple and easy type lithium cell tip sealing structure, includes the electric core in shell, the shell and installs the mass flow body at the shell tip, this mass flow body will the electric core is enclosed in the shell to constitute between the electric core electrically conductive, the mass flow body middle part is equipped with outside bellied boss, the mass flow body be equipped with the mass flow lid outward, the outer terminal surface of mass flow body is hugged closely in this mass flow lid interior terminal surface seal, the outer terminal surface of mass flow lid is equipped with interior support ring and outer support ring, and interior support ring is fixed with the boss, outer support ring is fixed with the shell.

The outer edge of the collecting cover is provided with a bending edge which is bent outwards in the circumferential direction, the bending edge covers the outer edge of the outer supporting ring in the circumferential direction, the outer edge of the end part of the shell is provided with an outer rolling opening which is turned over in the circumferential direction, and the outer rolling opening covers and seals the bending edge in the outer rolling opening and is fixed with the outer supporting ring; or the outer edge of the collecting cover is directly and circumferentially clung to the shell to form sealing, and the outer edge of the outer supporting ring is directly and circumferentially contacted with the shell and fixed.

The inner edge of the outer supporting ring is provided with an inner extending edge which extends inwards and is embedded into the collecting cover.

The middle part of the flow collecting cover is provided with a through hole for exposing the boss, and the hole wall of the through hole is in circumferential inclined plane sealing contact or circumferential vertical plane sealing contact with the outer surface of the boss.

The outer circumferential surface of the boss is provided with an inner rolling opening which is turned over circumferentially, and the inner rolling opening is fixed with the inner support ring, or the inner edge of the inner support ring is directly contacted with the boss circumferentially and is fixed; the outer edge of the inner support ring is provided with an extension edge which extends outwards and is embedded into the flow collecting cover.

The current collector consists of a current collecting piece and a current collecting ring, the current collecting ring forms a lug boss protruding outwards, and the outer edge of the current collecting ring is in conductive connection with the inner edge of the current collecting piece.

The boss is internally provided with a central hole which penetrates along the axial lead, a cover cap which is used for sealing and covering the central hole is arranged in the central hole or the boss is a totally-closed boss, and the totally-closed boss is provided with a magnetic sheet.

The outer edge of the current collector is provided with a hem of which the circumference is inwards bent, and an insulating ring is arranged between the hem and the shell.

The outer circumferential surface of the shell is provided with a rolling groove, and the insulating ring is positioned and fixed in the shell by the rolling groove, or the outer supporting ring extrudes the insulating ring through the flow collecting cover and is positioned and fixed in the shell.

Compared with the prior art, the utility model is mainly characterized in that the current collecting cover is additionally arranged outside the current collecting body, the inner end face of the current collecting cover is tightly and closely attached to the outer end face of the current collecting body in a sealing manner, the outer end face of the current collecting cover is provided with the inner supporting ring and the outer supporting ring which are fixed by the inner supporting ring and the lug boss, and the outer supporting ring is fixed with the shell of the lithium battery, so that the current collecting cover is pressed to seal the end part of the lithium battery. Obviously, the sealing and sealing of the end part of the lithium battery are mainly realized by the tightly attached collecting cover, the connection of the collecting cover and the shell is realized by the inner and outer supporting rings, namely the sealing and sealing of the end part of the lithium battery are respectively undertaken by the two structures, compared with the traditional method that the end part of the lithium battery is connected and sealed by mainly carrying out circumferential welding on the collecting ring, the simple sealing structure of the end part of the lithium battery omits a circumferential welding mode, and only the inner supporting ring and the lug boss as well as the outer supporting ring and the shell can be fixed, the requirement on a welding process is greatly reduced; meanwhile, the structural design is simpler, and by combining a corresponding manufacturing method, the welding time can be saved, the manufacturing efficiency can be improved, welding leakage points can be avoided, the pollution of welding protective gas to the environment can be reduced, and the like; in addition, the manufacturing method without circumferential welding also greatly reduces the manufacturing cost of the lithium battery.

Drawings

FIG. 1 is a sectional view of a first embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view of the positive terminal of fig. 1.

Fig. 3 is an enlarged cross-sectional view of the negative electrode terminal of fig. 1.

Fig. 4 is a cross-sectional view of a second construction of the present invention.

Fig. 5 is an enlarged cross-sectional view of the positive terminal of fig. 4.

Fig. 6 is an enlarged cross-sectional view of the negative electrode terminal of fig. 4.

Fig. 7 is a schematic cross-sectional view of the current collecting cap of fig. 2.

Fig. 8 is a schematic cross-sectional view of the current collecting cap of fig. 5.

Fig. 9 is a schematic sectional structure view of a current collecting plate.

Fig. 10 is a schematic sectional view of the collector ring (boss) in fig. 2.

Fig. 11 is a schematic sectional view of the collector ring (boss) in fig. 3.

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 11, 1, a housing, 11, a cell, 12, an outer roll opening, 13, a rolling groove, 2, a current collector, 21, a current collecting piece, 211, a folded edge, 22, a current collecting ring, 221, a middle hole, 222, an inner roll opening, 223, a groove, 3, a current collecting cover, 31, a through hole, 32, a bent edge, 33, an embedded groove, 34, a circumferential inclined plane, 35, a circumferential vertical plane, 4, an inner supporting ring, 41, an outer extending edge, 5, an outer supporting ring, 51, an inner extending edge, 6, an insulating ring, 7, a cover cap, 8, a sealing ring, 9, a boss and 10 magnetic sheets.

A simple end sealing structure of a lithium battery is shown in figure 1 and can be simultaneously suitable for end sealing of a positive end and a negative end of the lithium battery, and the structure of the simple end sealing structure of the lithium battery is mainly composed of a shell 1, an electric core 11 in the shell, a current collector 2 arranged at the end of the shell 1 and the like, wherein a current collecting cover 3 is arranged outside the current collector and is made of non-conductive rubber sealing materials, the inner end face of the current collecting cover is tightly attached to the outer end face of the current collector in a sealing mode, an inner supporting ring 4 and an outer supporting ring 5 are arranged on the outer end face of the current collecting cover 3, the inner supporting ring is fixed with a boss 9, and the outer supporting ring is fixed with the shell 1. Since the present embodiment is described by taking a cylindrical lithium battery as an example, the shapes of the components such as the housing 1, the current collector 2, the current collecting cover 3, the inner support ring 4, the outer support ring 5, and the like are mainly circular or annular.

The current collector 2 consists of a current collector piece 21 and a current collector ring 22, the current collector ring forms an outward convex boss 9, the outward convex boss is actually just positioned at the center of the current collector 2 and protrudes outward, and the outer edge of the current collector ring 22 is in conductive connection with the inner edge of the current collector piece 21.

The current collector 2 is formed by combining two structures, and the purpose is to meet the use requirement in the actual manufacturing process by respectively adopting two materials for the current collecting sheet 21 and the current collecting ring 22.

Meanwhile, the structures of the bosses 9 at the positive end and the negative end are different, the boss at the positive end is shown in fig. 10, a central hole 221 penetrating along the axial lead is arranged in the boss 9, a cap 7 for sealing and covering the central hole through a sealing ring 8 is arranged in the central hole, and a safety pressure relief device, such as a safety valve and the like, is required to be arranged in the cap; as shown in fig. 11, the projection 9 at the negative electrode end is actually a totally-enclosed projection, and the totally-enclosed projection is further provided with a magnetic sheet 10 embedded in the groove 223, and the magnetic sheet 10 has the following functions: in the manufacturing process of the lithium battery, a REID digital identification code can be absorbed by the magnetic sheet 10, so that the process assembly, the process parameters and the like of the whole lithium battery are detected, recorded, stored and tracked.

The fixing structure of the inner support ring 4 and the boss 9 is divided into two types: as shown in fig. 2 and 3, a circumferentially folded inner roll opening 222 is arranged on the outer circumferential surface of the boss 9, specifically on the outer circumferential surface of the current collecting ring 22, and presses the top surface of the inner support ring 4, and is welded and fixed with the inner support ring through a plurality of welding points; another method is that the inner edge of the inner support ring 4 is directly contacted with the boss 9 circumferentially and then is welded and fixed by a plurality of welding points, as shown in fig. 5 and 6.

The outer edge of the inner support ring 4 is provided with an outward extending edge 41 which surrounds circumferentially and extends outwards, the outward extending edge is directly embedded into the current collecting cover 3, and the fixing structure between the inner edge of the inner support ring 4 and the boss 9 is combined through the design of the outward extending edge 41, so that the mounting and fixing of the inner support ring 4 on the outer end face of the current collecting body 3 are enhanced.

The fixing structure of the outer supporting ring 5 and the shell 1 is also divided into two types: as shown in fig. 2 and 3, the outer edge of the collecting cover 3 is provided with a bending edge 32 which is bent outwards in the circumferential direction and covers the outer edge of the outer supporting ring 5 in the circumferential direction, the outer edge of the end part of the shell 1 is provided with an outer rolling port 12 which is turned over in the circumferential direction and covers and seals the bending edge 32 in the circumferential direction, and the outer rolling port and the outer supporting ring 5 are welded and fixed through a plurality of welding points; and the other is as shown in fig. 5 and 6, the outer edge of the collecting cover 3 is directly and circumferentially attached to the shell 1 to form sealing, and the outer edge of the outer supporting ring 5 is directly and circumferentially contacted with the shell 1 and is welded and fixed through a plurality of welding points.

The inner edge of the outer support ring 5 is provided with an inner extending edge 51 which surrounds circumferentially and extends inwards, the inner extending edge is directly embedded into the current collecting cover 3, and the fixing structure between the outer edge of the outer support ring 5 and the shell 1 is combined through the design of the inner extending edge 51, so that the mounting and fixing of the outer support ring 5 on the outer end surface of the current collecting cover 3 are enhanced.

After the inner and outer supporting rings are welded and fixed, the inner and outer supporting rings are respectively assembled in the caulking groove 33 preset on the outer end face of the collecting cover 3 in a matching way, so that a concentric double-lantern ring is formed between the inner and outer supporting rings, a supporting frame structure for pressing the collecting cover 3 is just formed, and at the moment, the outer end faces of the inner and outer supporting rings are just flush with the outer end face of the collecting cover 3 exposed between the inner and outer supporting rings.

The middle part of the collecting cover 3 is provided with a through hole 31 for exposing the boss 9, and the hole wall of the through hole and the outer surface of the boss 9 can be in sealing contact with a circumferential inclined plane 34 or a circumferential vertical plane 35 so as to meet the selection under various sealing conditions.

In addition, the mounting structure between the current collector 2 and the end of the housing 1 is: the outer edge of the current collector 2 is provided with a folding edge 211 which is bent inwards in the circumferential direction, an insulating ring 6 is arranged between the folding edge and the shell 1, and the installation position is positioned in the shell 1 while the installation is realized through the insulating ring.

The insulating ring 6 of the present embodiment mainly adopts two positioning structures, one is as shown in fig. 2 and fig. 3, a rolling groove 13 surrounding the circumference is arranged on the outer circumferential surface of the housing 1, and the insulating ring 6 is positioned and fixed in the housing 1 by the inner concave of the rolling groove, and the other is as shown in fig. 5 and fig. 6, the insulating ring 6 is extruded by the outer supporting ring 5 through the collecting cover 3, and the insulating ring is positioned and fixed in the housing 1.

Thus, the cell 11 can be enclosed in the casing 1 by the current collector 2 mounted on the end of the casing 1, and the current collector is electrically connected with the cell 11 by welding.

The manufacturing method of the simple lithium battery end sealing structure mainly comprises the following steps:

firstly, taking a shell 1 of a lithium battery and internally installing a battery cell 11;

step two, installing the current collector 2 at the end part of the shell 1 through the insulating ring 6, and simultaneously sealing the battery cell 11 in the shell 1, and enabling the current collector 2 and the battery cell 11 to form electric conduction;

step three, arranging a boss 9 protruding outwards and exposed in the middle of the current collector 2, and if the end part of the lithium battery is a positive end, arranging a middle hole 221 penetrating along the axial lead and a cover cap 7 for sealing and covering the middle hole in the boss; if the end part of the lithium battery is a negative end, the boss 9 is a totally-enclosed boss, and a magnetic sheet 10 is arranged on the totally-enclosed boss;

fourthly, arranging a current collecting cover 3 outside the current collector 2, enabling the inner end face of the current collecting cover to be tightly attached to the outer end face of the current collector in a sealing manner, arranging a through hole 31 for exposing the boss 9 in the middle of the current collecting cover 3, and enabling the hole wall of the through hole to be in sealing contact with a circumferential inclined plane 34 or a circumferential vertical plane 35 between the hole wall and the outer surface of the boss 9;

fifthly, an inner support ring 4 and an outer support ring 5 are arranged on the outer end face of the collecting cover 3;

step six, the inner support ring 4 is fixed with the boss 9, and the fixing structure is divided into two types: one is that the outer circumference of the boss 9 is provided with an inner rolling opening 222 which is turned over in the circumference and is fixed with the inner support ring 5 by the inner rolling opening; the other is that the inner edge of the inner support ring 4 is directly contacted with the boss 9 in the circumferential direction and is fixed;

fixing the outer support ring 5 with the shell 1, wherein the fixing structures are divided into two types; one is that the outer edge of the collecting cover 3 is provided with a bending edge 32 which is bent outwards in the circumferential direction, the outer edge of the outer supporting ring 5 is covered by the bending edge in the circumferential direction, meanwhile, the outer edge of the end part of the shell 1 is provided with an outer rolling port 12 which is turned over in the circumferential direction, and the outer rolling port covers and seals the bending edge 32 in the circumferential direction and is fixed with the outer supporting ring 5; the other is that the outer edge of the collecting cover 3 is directly and circumferentially clung to the shell 1 to form sealing, and the outer edge of the outer supporting ring 5 is directly and circumferentially contacted with the shell 1 and fixed;

and step eight, after the inner and outer support rings are respectively fixed with the lug boss 9 and the shell 1, the inner end face of the current collecting cover 3 can be ensured to be tightly attached to the outer end face of the current collecting body 2 in a sealing way, and therefore the sealing manufacture of the lithium battery port is completed.

The sealing and sealing of the end part of the lithium battery are realized by the tightly-attached collecting cover, and the connection of the collecting cover and the shell is realized by the inner and outer supporting rings, namely, the port sealing structure is respectively born by two parts, and because the sealing and the fixing are separately manufactured, the sealing and the connection are not required to be simultaneously ensured like circumferential welding as long as the inner supporting ring and the lug boss as well as the outer supporting ring and the shell can be fixed, so that the requirement on a welding process is greatly reduced; obviously, the structure mode is simpler in design, saves welding time, improves manufacturing efficiency, avoids welding leakage points, reduces the pollution of welding protective gas to the environment and the like; meanwhile, the manufacturing cost of the lithium battery is greatly reduced due to the manufacturing mode without circumferential welding.

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.

Claims (9)

1. The utility model provides a simple and easy type lithium cell tip sealing structure, electric core (11) in shell (1), the shell and install mass flow body (2) at shell (1) tip, this mass flow body will electric core (11) seal in shell (1) to constitute electrically conductive between with electric core (11), mass flow body (2) middle part is equipped with outside bellied boss (9), its characterized in that mass flow body (2) be equipped with current collection lid (3) outward, the outer terminal surface of mass flow body is hugged closely in the face seal in this current collection lid, the outer terminal surface of current collection lid (3) is equipped with interior support ring (4) and outer support ring (5), and interior support ring (4) are fixed with boss (9), outer support ring (5) are fixed with shell (1).

2. The simple lithium battery end sealing structure of claim 1, characterized in that the outer edge of the collecting cover (3) is provided with a bending edge (32) which is bent outwards along the circumference and covers the outer edge of the outer supporting ring (5), the outer edge of the end of the shell (1) is provided with an outer rolling opening (12) which is bent along the circumference and covers and seals the bending edge (32) and is fixed with the outer supporting ring (5); or the outer edge of the collecting cover (3) is directly and circumferentially clung to the shell (1) to form sealing, and the outer edge of the outer supporting ring (5) is directly and circumferentially contacted with the shell (1) and fixed.

3. The simplified lithium battery end sealing structure as claimed in claim 2, wherein the inner edge of the outer supporting ring (5) is provided with an inwardly extending edge (51) embedded in the current collecting cover (3).

4. The simple lithium battery end sealing structure as claimed in claim 1, wherein the central portion of the current collecting cover (3) is provided with a through hole (31) for exposing the boss (9), and the wall of the through hole is in sealing contact with the outer surface of the boss (9) by a circumferential inclined surface (34) or a circumferential vertical surface (35).

5. The simple lithium battery end sealing structure of claim 1, wherein the outer circumference of the boss (9) is provided with a circumferentially folded inner winding opening (222) which is fixed with the inner support ring (4), or the inner edge of the inner support ring (4) is directly contacted and fixed on the boss (9); the outer edge of the inner support ring (4) is provided with an extension edge (41) which extends outwards and is embedded into the flow collecting cover (3).

6. The simple lithium battery end sealing structure as claimed in claim 1, wherein the current collector (2) is formed by a current collector sheet (21) and a current collector ring (22), the current collector ring is formed into a convex boss (9) protruding outwards, and the outer edge of the current collector ring is conductively connected with the inner edge of the current collector sheet.

7. The simple lithium battery end sealing structure according to claim 1, wherein a central hole (221) penetrating along the axis is formed in the boss (9), a cap (7) or the boss (9) for sealing and covering the central hole is formed in the central hole and is a fully-closed boss, and a magnetic sheet (10) is arranged on the fully-closed boss.

8. The simple lithium battery end sealing structure as claimed in claim 1, wherein the current collector (2) has a flange (211) at its outer edge, the flange being bent inward, and an insulating ring (6) is disposed between the flange and the casing.

9. The simple lithium battery end sealing structure of claim 8, wherein the outer circumference of the housing (1) is provided with a rolling groove (13) by which the insulating ring (6) is positioned and fixed in the housing (1), or the outer supporting ring (5) presses the insulating ring (6) through the collecting cover (3) and positions and fixes the insulating ring in the housing (1).

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