CN219873939U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The utility model relates to a battery monomer, a battery and electric equipment. The battery cell includes: a housing having a mounting hole; the battery cell component is accommodated in the shell; the pole is penetrated through the mounting hole and insulated from the shell; the pole is provided with a first through hole penetrating through one end of the pole, which is positioned in the shell, and one end of the pole, which is positioned outside the shell; and the current collecting disc comprises a disc body and a protruding part protruding from one side of the disc body, wherein the disc body is arranged between the pole and the cell module and is electrically connected with the cell module, and the protruding part penetrates through the first through hole and is welded with the pole. Therefore, as the protruding part of the current collecting disc is arranged in the first through hole of the pole in a penetrating way, namely, the protruding part of the current collecting disc penetrates out of the shell from the inside of the shell, the protruding part of the current collecting disc and the pole can be welded at one end of the pole outside the shell, welding operation in the shell is avoided, the welding operation difficulty is reduced, welding slag generated by the welding operation cannot remain in the shell, and the risk of short circuit of the battery cell is greatly reduced.

Description

Battery monomer, battery and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Batteries are widely used in various devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. The battery cell is an important component of the battery, and generally comprises a shell, a pole column, a battery cell assembly and a current collecting disc, wherein the battery cell assembly and the current collecting disc are contained in the shell, and the current collecting disc is electrically connected with the positive electrode of the battery cell assembly and the pole column, so that the pole column is used as the positive electrode of the battery cell.

One end of the pole is positioned outside the shell, and the other end of the pole is positioned in the shell and welded with the current collecting disc. Therefore, when the current collecting disc and the pole are welded, the welding head needs to extend into the shell, namely, the welding operation is performed in the shell, so that the welding operation is inconvenient, welding slag is easy to remain in the shell, and the risk of short circuit of the battery cell is greatly improved.

Disclosure of Invention

Based on this, it is necessary to provide a battery cell, a battery and electric equipment for improving the above-mentioned defects, which are necessary to solve the problems that in the prior art, the welding operation of the current collecting disc and the pole needs to be performed inside the shell, which causes inconvenience in the welding operation, and welding slag is easy to remain inside the shell, thereby greatly improving the risk of short circuit of the battery cell.

A battery cell comprising:

a housing having a mounting hole;

the battery cell assembly is accommodated in the shell;

the pole is penetrated through the mounting hole and insulated from the shell; the pole is provided with a first through hole, and the first through hole penetrates through one end of the pole, which is positioned in the shell, and one end of the pole, which is positioned outside the shell; a kind of electronic device with high-pressure air-conditioning system

The current collecting disc comprises a disc body and a protruding portion protruding from one side of the disc body, the disc body is arranged between the pole and the cell module and is electrically connected with the cell module, and the protruding portion penetrates through the first through hole and is welded with the pole.

In one embodiment, an end of the protrusion away from the disc body is welded to an inner wall of the first through hole.

In one embodiment, the tray body has a second through hole, and the protrusion is ring-shaped and arranged around the second through hole;

the battery cell also comprises a sealing piece which is arranged in the first through hole in a sealing way, and the sealing piece is positioned at one end of the protruding part, which is away from the disc body.

In one embodiment, the peripheral edge of the seal is welded to an end face of the projection remote from the cell assembly.

In one embodiment, the peripheral edge of the seal is welded to the inner wall of the first through hole.

In one embodiment, the seal is a seal pin.

In one embodiment, the end of the pole located outside the shell is provided with a first stop part, and the end of the pole located inside the shell is provided with a second stop part;

the battery cell also comprises an elastic sealing piece and a stop ring, wherein the elastic sealing piece is sleeved outside the pole and is positioned between the shell and the first stop part; the stop ring is sleeved outside the pole and positioned on the inner side of the shell, and part of the stop ring is matched with one side, close to the first stop part, of the second stop part in a stop mode.

In one embodiment, the battery cell further includes a first insulating member and a second insulating member, the first insulating member is disposed in the housing and between the housing and the disc body, and the second insulating member is disposed outside the elastic sealing member and between the first stopper and the housing.

A battery comprising a battery cell as described in any one of the embodiments above.

A powered device comprising a battery cell or battery as described in any of the embodiments above.

Above-mentioned battery monomer, battery and consumer, the dish body of current collecting dish is connected with electric core subassembly electricity, and the bulge and the utmost point post electricity of current collecting dish are connected to make utmost point post as a single electrode of battery monomer, with the input and the output of realization electric energy. Because the bulge of current collecting tray wears to establish in the first through-hole of utmost point post, wear out to the shell outside promptly from the shell to can be located the one end department outside the shell by the utmost point post and weld current collecting tray's bulge and utmost point post, avoid needing to carry out welding operation in the shell is inside, reduce the welding operation degree of difficulty, and the welding slag that welding operation produced can not remain in the shell, greatly reduced the risk of electric core short circuit.

Drawings

Fig. 1 is a schematic exploded view of a battery cell according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of the battery cell shown in fig. 1;

fig. 3 is a partial enlarged view of the battery cell shown in fig. 1 at a first cap plate;

fig. 4 is a schematic structural view of a current collecting plate of the battery cell shown in fig. 1.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

In one embodiment of the utility model, a battery is provided that refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present utility model may include a battery module, a battery pack, or the like. In particular, the battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells. Specifically, in the battery, the number of the battery cells may be one or more. If the number of the battery cells is multiple, the multiple battery cells can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the multiple battery cells are connected in series or in parallel. The battery modules can be formed by connecting a plurality of battery monomers in series or in parallel or in series-parallel connection, and the battery modules are connected in series or in parallel or in series-parallel connection to form a whole and are accommodated in the box body. Or all the battery cells can be directly connected in series or in parallel or in series-parallel, and then the whole formed by all the battery cells is accommodated in the box body.

It is understood that the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium ion battery cell, or a magnesium ion battery cell, which is not limited in the embodiment of the utility model. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the utility model. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

Referring to fig. 1 to 4, an embodiment of the utility model provides a battery cell including a housing (not shown), a battery cell assembly 20, a pole 30 and a current collecting plate 40. The housing has a mounting hole (not shown) in which the cell assembly 20 is housed. The pole 30 is inserted into the mounting hole of the housing and insulated from the housing. The pole 30 has a first through hole 31, one end of the first through hole 31 penetrates through an end surface of the pole 30 located in the housing, and the other end of the first through hole 31 penetrates through an end surface of the pole 30 located outside the housing. The current collecting tray 40 includes a tray body 41 and a protrusion 43 protruding from one side of the tray body 41. The disc body 41 is disposed between the pole 30 and the cell assembly 20 and is electrically connected to the cell assembly 20. The protruding portion 43 penetrates through the first through hole 31 of the pole 30 and is welded with the pole 30, so that the current collecting plate 40 is fixedly and electrically connected with the pole 30.

In the above battery cell, the plate body 41 of the current collecting plate 40 is electrically connected with the cell assembly 20, and the protrusion 43 of the current collecting plate 40 is electrically connected with the pole 30, so that the pole 30 serves as one electrode of the battery cell to realize input and output of electric energy. Because the bulge 43 of the current collecting disc 40 is arranged in the first through hole 31 of the pole 30 in a penetrating way, namely, the bulge 43 of the current collecting disc 40 can be welded with the pole 30 at one end of the pole 30 outside the shell, the welding operation in the shell is avoided, the welding operation difficulty is reduced, welding slag generated by the welding operation cannot remain in the shell, and the risk of short circuit of the battery core is greatly reduced.

In some embodiments, the end of the protrusion 43 of the current collecting tray 40 remote from the tray body 41 is welded to the inner wall of the first through hole 31. That is, the protruding portion 43 of the current collecting plate 40 does not penetrate to the end face of the terminal 30 away from the plate body 41, but is located in the first through hole 31 and welded with the inner wall of the first through hole 31, that is, the protruding portion 43 is prevented from penetrating to the end face of the terminal 30 located outside the housing to affect the assembly of the battery cell into the battery module. It should be noted that, in the present embodiment, the protruding portion 43 of the current collecting disc 40 seals the first through hole 31, and the protruding portion 43 of the current collecting disc 40 is welded to the inner wall of the first through hole 31, so that, on one hand, the fixed connection and the electrical connection between the protruding portion 43 of the current collecting disc 40 and the pole 30 are realized, and on the other hand, the sealing between the protruding portion 43 and the inner wall of the first through hole 31 can be realized by welding, so as to avoid the leakage of the electrolyte in the casing from the gap between the inner wall of the first through hole 31 and the protruding portion 43. In order to achieve the sealing effect, the protruding portion 43 and the inner wall of the first through hole 31 may be continuously laser welded along the circumferential direction of the first through hole 31, and the welding is performed around the protruding portion 43 for one circle.

In some embodiments, the disk body 41 has a second through hole 45, and the protrusion 43 has a ring shape disposed around the second through hole 45. The outer wall of the protruding portion 43 is matched with the inner wall of the first through hole 31. The battery cell further includes a sealing member 50 sealingly disposed in the first through-hole 31, the sealing member 50 being located at an end of the projection 43 facing away from the disk body 41. In this way, the electrolyte can be injected into the casing through the second through hole 45, and after the injection of the electrolyte is completed, the sealing member 50 is sealed in the first through hole 31, that is, the sealing member 50 seals the first through hole 31, so that the electrolyte is prevented from leaking out from the second through hole 45 and the first through hole 31. Alternatively, the seal 50 may be a seal pin. In this embodiment, in order to prevent the welding slag generated during welding from entering the interior of the housing through the second through hole 45, the second through hole 45 may be shielded by a shielding tool when the protruding portion 43 and the pole 30 are welded, so that the shielding tool prevents the welding slag from falling into the second through hole 45, that is, ensures that the welding slag does not enter the interior of the housing through the second through hole 45. The specific structure of the shielding tool is not limited herein, as long as it can function to block the welding slag from falling into the second through hole 45.

In one embodiment, the peripheral edge of the seal 50 is attached and welded to the end face of the projection 43 remote from the cell assembly 20. Specifically, the seal 50 and the projection 43 are laser penetration welded by the side of the seal 50 facing away from the projection 43 (i.e., the outside of the seal 50). In this way, the protruding portion 43 of the current collecting plate 40 is welded to the inner wall of the first through hole 31 of the pole 30, and the peripheral edge of the sealing member 50 is welded to the end surface of the protruding portion 43, which is far away from the cell assembly 20, so that, on one hand, the fixed connection and the electrical connection of the current collecting plate 40, the pole 30 and the sealing member 50 are realized, and on the other hand, the sealing of the first through hole 31 and the second through hole 45 is also realized.

It should be noted that the sealing member 50 is not limited to being welded to the protruding portion 43. In another embodiment, the peripheral side edge of the seal member 50 is welded to the inner wall of the first through hole 31. Specifically, the peripheral side edge of the seal member 50 and the inner wall of the first through hole 31 are laser welded by the side of the seal member 50 facing away from the projection 43 (i.e., the outer side of the seal member 50), and the weld is made to surround the seal member 50 for one revolution so that the seal member 50 seals with the inner wall of the first through hole 31.

In the embodiment of the present utility model, the housing includes a shell 11 and a first cover plate 12, and one end of the shell 11 has a first opening 111 (see fig. 1). The battery cell assembly 20 is accommodated inside the housing 11. The first cover plate 12 is disposed at the first opening 111 to close the first opening 111. The mounting hole is formed in the first cover plate 12, and the post 30 is provided in the first cover plate 12 through the mounting hole in an insulating manner.

Alternatively, the first cover plate 12 is welded at the first opening 111 of the housing 11, so that a fixed connection of the first cover plate 12 to the housing 11 is achieved and the first cover plate 12 closes the first opening 111. It should be noted that, in other embodiments, the housing 11 and the first cover 12 may be integrally formed by a stamping and stretching process, which is not limited herein.

In some embodiments, the end of the pole 30 outside the first cover plate 12 has a first stop 33, and the end of the pole 30 inside the first cover plate 12 has a second stop 35. The battery cell also includes an elastomeric seal 70 and a stop ring 60. The elastic sealing member 70 is sleeved outside the pole 30 and located between the first cover plate 12 and the first stop portion 33, so that the elastic sealing member 70 elastically deforms under the co-extrusion action of the first stop portion 33 and the first cover plate 12. The stop ring 60 is sleeved outside the pole 30 and is located at the inner side of the first cover plate 12, and a part of the stop ring 60 is in stop fit with one side, close to the first stop part 33, of the second stop part 35. In this way, the pole 30, the stop ring 60 and the first cover plate 12 form a riveted structure, that is, on the one hand, the first stop portion 33 is in stop fit with the first cover plate 12 through the elastic sealing member 70, so as to stop the pole 30 from moving into the housing; on the other hand, the second stop part 35 is in stop fit with the stop ring 60, so that the stop ring 60 is used for stopping the pole 30 from moving outwards of the shell, namely, the pole 30 and the first cover plate 12 are relatively fixed. It will be appreciated that the inner side of the first cover plate 12 refers to the side of the first cover plate 12 facing the inside of the housing 11, and the outer side of the first cover plate 12 refers to the side of the first cover plate 12 facing the outside of the housing 11.

Specifically, the first stop 33 is a self-contained structure of the pole 30 (i.e., the first stop 33 exists before the pole 30 is riveted with the first cover 12), and the second stop 35 is formed when the pole 30 is riveted with the first cover 12. More specifically, at the time of assembly, the pole 30 is first inserted into the mounting hole from the outside of the first cover plate 12 until the first stopper 33 abuts against the outside of the first cover plate 12 through the elastic seal 70, and one end of the pole 30 located inside the first cover plate 12 passes through the stopper ring 60; and then mechanically pressurizing (such as spin riveting) one end of the pole 30 positioned on the inner side of the first cover plate 12, wherein the outer diameter of one end of the pole 30 positioned on the inner side of the first cover plate 12 is enlarged to form a second stop part 35 in the pressurizing process, so that the second stop part 35 is in stop fit with the stop ring 60, and the relative fixation of the pole 30 and the first cover plate 12 is realized.

In particular embodiments, the battery cell further includes a first insulator 80 and a second insulator 90. The first insulating member 80 is disposed within the housing 11 between the first cover plate 12 and the disc body 41, so that the disc body 41 is insulated from the first cover plate 12 by the first insulating member 80. The second insulating member 90 is sleeved outside the elastic sealing member 70 and is located between the first stop portion 33 and the first cover plate 12, and on one hand, insulation between the first stop portion 33 of the pole 30 and the first cover plate 12 is achieved by using the elastic sealing member 70 and the second insulating member 90 together; on the other hand, the second insulating member 90 may limit the compression amount of the first stop portion 33 on the elastic sealing member 70, so as to avoid over-compressing the elastic sealing member 70, which is beneficial to improving the service life of the elastic sealing member 70.

Further, the outer ring portion of the stop ring 60 abuts against the surface of the first insulating member 80 facing the side of the battery cell assembly 20, the inner ring portion of the stop ring 60 and the second stop portion 35 are in stop fit with each other facing the side of the first stop portion 33, so that the first stop portion 33 and the second stop portion 35 jointly compress the stop ring 60, the first insulating member 80, the first cover plate 12, the second insulating member 90 and the elastic sealing member 70 therebetween, namely, the pole 30 and the first cover plate 12 are riveted and fixed; on the other hand, the first insulator 80 is used to insulate the stop ring 60 from the first cover plate 12.

Further, portions of the first insulator 80 and/or portions of the elastomeric seal 70 are located between the post 30 and the inner wall of the mounting hole, thereby avoiding electrical communication between the post 30 and the first cover plate 12.

The material of the first insulating member 80 and the second insulating member 90 may be plastic, but other insulating materials may be used, and the present utility model is not limited thereto. The elastic sealing member 70 may be made of rubber, but other materials having certain elasticity and insulation may be used, which is not limited herein. The material of the stopper ring 60 may be stainless steel, but other materials may be used, as long as they can be riveted, and the present utility model is not limited thereto.

In an embodiment of the present utility model, the end of the housing 11 facing away from the first cover plate 12 has a second opening 113 (see fig. 1), and the battery cell assembly 20 is disposed in the housing 11 through the second opening 113. The housing further includes a second cap plate 13, and the battery cell further includes a current collecting member 100. The second cover 13 is disposed at the second opening 113 of the housing 11 to close the second opening 113. A current collecting member 100 is disposed between the battery cell assembly 20 and the second cap plate 13, and the current collecting member 100 is electrically connected to the battery cell assembly 20 and to the second cap plate 13 and/or the case 11, thereby achieving electrical connection of the case 11 and the battery cell assembly 20 such that the case 11 can serve as another electrode of the battery cell. That is, the post 30 and the case 11 serve as two electrodes (i.e., a positive electrode and a negative electrode) of the battery cell, respectively, and collectively realize output and output of electric energy of the battery cell.

Specifically, the cell assembly 20 is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be polypropylene (PP) or Polyethylene (PE). In addition, the cell assembly 20 may be a winding type structure or a lamination type structure, and the embodiment of the present utility model is not limited thereto.

Optionally, the current collecting plate 40 is electrically connected to the positive tab of the cell assembly 20, such that the post 30 serves as the positive electrode of the battery cell. The current collecting member 100 is electrically connected with the negative electrode tab of the battery cell assembly 20 such that the case 11 serves as the negative electrode of the battery cell. Of course, in other embodiments, the current collecting plate 40 is electrically connected with the negative tab of the cell assembly 20 such that the post 30 acts as the negative electrode of the battery cell. The current collecting member 100 is electrically connected to the positive electrode tab of the battery cell assembly 20 such that the case 11 serves as a positive electrode of the battery cell, which is not limited herein.

Alternatively, the materials of the housing 11, the first cover plate 12 and the second cover plate 13 may be steel. The material of the current collecting plate 40 and the current collecting member 100 may be copper, and the outer surface of the current collecting plate 40 and the current collecting member 100 has a nickel plating layer. Of course, in other embodiments, other conductive materials may be used for the housing 11, the first cover plate 12, the second cover plate 13, the current collecting plate 40 and the current collecting member 100, which is not limited herein.

Based on the battery, the utility model further provides electric equipment. The powered device includes a battery or battery cell as described in any of the embodiments above, with the powered device utilizing the battery or battery cell as a power source. In particular, the electrical consumer may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric equipment in particular.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A battery cell, comprising:

a housing having a mounting hole;

a battery cell assembly (20) housed within the housing;

a pole (30) penetrating the mounting hole and insulated from the housing; the pole (30) is provided with a first through hole (31), and the first through hole (31) penetrates through one end of the pole (30) positioned in the shell and one end positioned outside the shell; a kind of electronic device with high-pressure air-conditioning system

The current collecting disc (40) comprises a disc body (41) and a protruding portion (43) protruding from one side of the disc body (41), wherein the disc body (41) is arranged between the pole (30) and the cell assembly (20) and is electrically connected with the cell assembly (20), and the protruding portion (43) penetrates through the first through hole (31) and is welded with the pole (30).

2. The battery cell according to claim 1, wherein an end of the protruding portion (43) remote from the tray body (41) is welded to an inner wall of the first through-hole (31).

3. The battery cell according to claim 1 or 2, wherein the plate body (41) has a second through hole (45), and the protruding portion (43) has a ring shape disposed around the second through hole (45);

the battery cell further comprises a sealing member (50) which is arranged in the first through hole (31) in a sealing manner, and the sealing member (50) is positioned at one end of the protruding part (43) away from the disc body (41).

4. A battery cell according to claim 3, wherein a peripheral edge of the seal (50) is welded to an end face of the projection (43) remote from the cell assembly (20).

5. A battery cell according to claim 3, wherein the peripheral edge of the seal (50) is welded to the inner wall of the first through-hole (31).

6. A battery cell according to claim 3, wherein the seal (50) is a sealing spike.

7. The battery cell according to claim 1, wherein the end of the pole (30) located outside the housing has a first stop (33), and the end of the pole (30) located inside the housing has a second stop (35);

the battery cell further comprises an elastic sealing piece (70) and a stop ring (60), wherein the elastic sealing piece (70) is sleeved outside the pole post (30) and is positioned between the shell and the first stop part (33); the stop ring (60) is sleeved outside the pole (30) and is positioned on the inner side of the shell, and a part of the stop ring (60) is in stop fit with one side, close to the first stop part (33), of the second stop part (35).

8. The battery cell of claim 7, further comprising a first insulator (80) and a second insulator (90), the first insulator (80) being disposed within the housing and between the housing and the tray body (41), the second insulator (90) being sleeved outside the elastomeric seal (70) and between the first stop (33) and the housing.

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

10. A powered device comprising a battery cell according to any one of claims 1 to 8 or a battery according to claim 9.