CN217544857U - Cylindrical battery and welding structure of pole column and pole lug thereof - Google Patents
Cylindrical battery and welding structure of pole column and pole lug thereof Download PDFInfo
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- CN217544857U CN217544857U CN202220854188.6U CN202220854188U CN217544857U CN 217544857 U CN217544857 U CN 217544857U CN 202220854188 U CN202220854188 U CN 202220854188U CN 217544857 U CN217544857 U CN 217544857U
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Abstract
The utility model discloses a cylinder battery and utmost point post and welded structure of utmost point ear thereof, welded structure includes: the shell comprises a side wall and a bottom wall, the side wall is connected with the bottom wall, and the bottom wall is provided with a through hole; the battery cell comprises a body part and a first tab set led out from the body part, wherein the body part is provided with a winding needle hole, the winding needle hole penetrates through the end faces at the two ends of the body part, the plurality of first tab sets are folded to the end faces of the body part to form folding parts, and the folding parts cover the openings of the winding needle holes; and the pole column penetrates through the through hole and is fixedly connected to the bottom wall through the sealing element, and the pole column is welded with the folding part which is positioned in the winding needle hole and projects along the longitudinal direction. This application just welds the folded portion that forms a plurality of first utmost point ear sets to utmost point post through welding once, has reduced the welding number of times, and then has reduced welding badness such as rosin joint and overwelding, and the electric current can be directly transmitted to utmost point post by first utmost point ear set, has reduced the internal resistance, has increased the ability of overflowing.
Description
Technical Field
The utility model belongs to the technical field of power battery, concretely relates to cylinder battery and utmost point post and utmost point ear's welded structure thereof.
Background
With the development of modern society and the enhancement of environmental awareness of people, more and more devices select a lithium battery as a power supply, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, so that a wide space is provided for the application and development of the lithium battery. Among them, lithium batteries used in electric tools, electric vehicles, and the like are generally called power batteries.
For a cylindrical battery, in a general case, a pole of a battery cell is connected with a pole lug of the battery cell through a current collecting piece so as to lead out electric energy of the battery cell through the pole lug, in the existing battery production process, the pole lug is arranged at one end of a battery shell, a welding pipe is welded at the bottom of the pole lug through the current collecting piece welded by the pole lug of the winding needle Kong Rangyu, the pole lug and the pole lug need to be welded respectively through the current collecting piece, so that two times of welding are needed, risks of poor welding such as insufficient welding, over welding and the like are increased by the two times of welding, the overcurrent area is relatively small, the internal resistance of the battery is relatively large, and the consistency is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the cylindrical battery and the welding structure of the pole and the pole lug thereof are provided, the welding frequency is reduced, poor welding such as insufficient welding and over welding is reduced, the current can be directly transmitted to the pole by the first pole lug in an integrated mode, the current does not need to be transmitted to the pole through the current collecting piece, the internal resistance is further reduced, and the overcurrent capacity is increased.
In order to realize the purpose, the utility model adopts the following technical scheme:
in a first aspect, the present application provides a welded structure of cylinder battery utmost point post and utmost point ear, includes:
the shell comprises a side wall and a bottom wall, the side wall is connected with the bottom wall, and the bottom wall is provided with a through hole;
the battery cell is accommodated in the shell and comprises a body part and a first tab set led out from the body part, the body part is provided with a winding pin hole, and the winding pin hole penetrates through the end faces of the two ends of the body part, wherein the first tab sets are folded to the end faces of the body part to form folding parts, and the folding parts cover openings of the winding pin holes;
and the pole column penetrates through the through hole and is fixedly connected with the bottom wall through a sealing element, wherein the pole column is welded with the folded part.
Preferably, the body portion is a winding structure formed by winding a first pole piece, a diaphragm and a second pole piece in sequence, and the first tab set includes tabs led out from any number of turns of the first pole piece located in the same direction.
Preferably, the first tab sets are uniformly distributed on the end surface of the body part.
Preferably, the tab is provided with a bending portion which is transversely bent, and the bending portion is bent towards the axis center of the end face of the battery cell.
Preferably, the protective sheet is arranged between the folding part and the opening of the rolling needle hole and connected with the folding part.
Preferably, the protection sheet is located at most in the longitudinal projection of the winding needle hole, and the protection sheet is arranged in the winding needle hole.
Preferably, the battery further comprises an insulating member, and the insulating member is arranged between the end face of the battery cell and the bottom wall.
Preferably, the insulating part is provided with a through hole, and the pole penetrates through the through hole to be welded with the folding part.
Preferably, the insulating member includes a first insulating portion and a second insulating portion, the through hole is disposed in the first insulating portion, and the second insulating portion surrounds an edge of the first insulating portion and extends toward an end surface of the battery cell.
In a second aspect, the present application provides a cylindrical battery including the welded structure according to any one of the aspects of the first aspect.
The utility model discloses following beneficial effect has at least:
this application forms folding portion through the terminal surface with a plurality of first utmost point ear collections are folded to this somatic part, and folding portion covers the opening of rolling up the pinhole, and at the welding process, the welded tube welds utmost point post and the folding portion that lies in a roll pinhole along longitudinal projection through rolling up the pinhole, just welds first utmost point ear collection to utmost point post through once welding. Compared with the prior art, the current collecting piece is not needed, welding times are reduced, poor welding such as insufficient solder and over-welding is reduced, current can be directly transmitted to the pole through the first pole lug set, the current does not need to be transmitted to the pole through the current collecting piece, internal resistance is reduced, overcurrent capacity is improved, the first pole lugs are welded to the pole in a set mode, the current can be transmitted to the pole through the first pole lugs in a set mode, the internal resistance is reduced, and the overcurrent capacity of the battery is improved. In addition, owing to need not to use the mass flow piece, consequently also reduced the accessory, can occupy the inside longitudinal space of battery when using the mass flow piece simultaneously, consequently the inside longitudinal space of battery can also be saved to this application, and then the energy density of promotion battery.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a welding structure according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of an electric core of an unfolded first tab assembly according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of an electric core with a first tab assembly folded according to an embodiment of the present invention.
Fig. 4 is a schematic perspective view of an electric core with a plurality of first tabs folded together to form a folded portion according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a battery cell according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a welding structure with a protection sheet according to an embodiment of the present invention.
Fig. 7 is a three-dimensional exploded structural view of a cylindrical battery according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a cylindrical battery according to an embodiment of the present invention.
Wherein the reference numerals are as follows:
1-a shell; 11-a side wall; 12-a bottom wall; 121-a through hole; 2-electric core; 20-a body portion; 201-winding pin holes; 21-a first set of tabs; 211-a tab; 212-a bending section; 213-a fold; 22-a protective sheet; 23-a second tab; 3-pole column; 31-a seal; 4-an insulator; 40-through holes; 41-first insulation part; 42-a second insulation; 5-a cover assembly; 51-a cover plate; 52-insulating seal ring; x-transverse direction; y-longitudinal direction.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The following embodiments will explain the cylindrical battery and the welding structure of the electrode post and the electrode tab thereof in detail with reference to fig. 1 to 8.
As shown in fig. 1 to 8, the present application provides a welding structure of a cylindrical battery post 3 and a tab 211, comprising:
the shell 1 comprises a side wall 11 and a bottom wall 12, wherein the side wall 11 is connected with the bottom wall 12, and the bottom wall 12 is provided with a through hole 121;
the battery cell 2 is accommodated in the casing 1, the battery cell 2 includes a body portion 20 and first tab sets 21 led out from the body portion 20, the body portion 20 is provided with a winding pin hole 201, the winding pin hole 201 penetrates through end surfaces of two ends of the body portion 20, wherein the plurality of first tab sets 21 are folded to the end surfaces of the body portion 20 to form folding portions 213, and the folding portions 213 cover openings of the winding pin holes 201;
the pole 3, the pole 3 passes through the through hole 121 and is fixedly connected to the bottom wall 12 through the sealing member 31, wherein the pole 3 is welded with the folded portion 213 located in the projection of the winding pin hole 201 along the longitudinal direction Y.
Specifically, for the electric core 2, the electric core 2 is sequentially stacked and wound by the first pole piece, the diaphragm and the second pole piece, so as to form an electrode unit of the electric core 2, that is, the electrode unit is a winding structure, wherein the first pole piece, the diaphragm and the second pole piece need to be wound by a winding needle in a winding process, and therefore, a winding needle hole 201 penetrating through end faces at two ends of the body portion 20 is formed in a winding structure formed after the winding is completed. In the discharging process of the cylindrical battery, the current is led out to the first tab set 21 through the first pole piece, then conducted to the bottom wall 12, and further led out to an external circuit. The battery cell 2 further includes a second tab 23, the second tab 23 is disposed at an end of the main body portion 20 opposite to the first tab assembly 21, and in a discharging process of the cylindrical battery, the current is conducted into the second tab 23 through the cover assembly 5 and then conducted to the second pole piece.
Specifically, the housing 1 includes a side wall 11 and a bottom wall 12, the side wall 11 is connected to the bottom wall 12, the bottom wall 12 is provided with a through hole 121, that is, the through hole 121 penetrates through upper and lower end faces of the bottom wall 12, the pole 3 penetrates through the through hole 121, a sealing member 31 is arranged between the pole 3 and the bottom wall 12, and the sealing member 31 is used for fixing the pole 3 in the through hole 121 and insulating the pole 3 from the bottom wall 12.
It can be understood that the shape and structure of the pole post 3 are not particularly limited in the embodiment of the present application, for example, the pole post 3 may be configured in an i-shape, and the sealing member 31 matched with the shape is fixed in the through hole 121 in a matching manner, and may be used for welding with the first tab assembly 21. It should be understood that the pole 3 may have other shapes such as T-shaped and boss-shaped structures, so long as it can be fixed to the bottom wall 12 and electrically connected to the first tab assembly 21 and the external circuit. Wherein, the pole 3 is welded with a folded part 213 which is positioned in the winding needle hole 201 and projected along the longitudinal direction Y. In addition, the material of the sealing member 31 is PPS, fluoroplastic, or fluororubber, wherein the PPS is nano injection molding sealing.
This application forms folded part 213 through folding a plurality of first utmost point ear collections 21 to the terminal surface of this body portion 20, and folded part 213 covers the opening of rolling up pinhole 201, and in welding process, the welded tube is through rolling up pinhole 201 with utmost point post 3 with lie in the folded part 213 welding that rolls up pinhole 201 along longitudinal Y projection, just weld first utmost point ear collection 21 to utmost point post 3 through once welding. Compared with the prior art, the current collecting piece is not needed, welding times are reduced, poor welding such as insufficient solder and over-welding is reduced, current can be directly transmitted to the pole 3 from the first pole lug set 21, the current does not need to be transmitted to the pole 3 through the current collecting piece, internal resistance is reduced, overcurrent capacity is improved, the first pole lug sets 21 are welded to the pole 3, the current can be transmitted to the pole 3 through the first pole lug sets 21, the internal resistance is reduced, and the overcurrent capacity of the battery is improved. In addition, owing to need not to use the mass flow piece, consequently also reduced the accessory, can occupy the inside vertical Y space of battery simultaneously when using the mass flow piece, consequently the inside vertical Y space of battery can also be saved to this application, and then the energy density of promotion battery.
In an alternative embodiment of the present application, the body portion 20 is a winding structure formed by winding a first pole piece, a separator and a second pole piece in sequence, as shown in fig. 2 to 5, the first tab set 21 includes tabs 211 extracted from the first pole piece in any number of turns in the same orientation.
Specifically, the first pole piece, the diaphragm and the second pole piece are sequentially wound to form a winding structure, so that the first pole piece is wound in a spiral shape, and the first pole piece comprises a plurality of circles from inside to outside. The tab 211 led out from any number of circles of the first pole pieces in the same direction refers to the tab 211 led out from any number of circles of the first pole pieces in the first pole pieces of the winding structure in the same horizontal plane direction, for example, the first tab set 21 includes the tabs 211 led out from the first pole pieces in the first circle, the second circle, the third circle, and the like in the same direction, and these tabs 211 form the first tab set 21, and it should be noted that the tab 211 is the first tab led out from the first pole piece.
The tab 211 led out by the first pole piece with any number of circles in the same direction is arranged on the first tab set 21, so that the first tab set 21 can be concentrated in one area, the first tab set 21 can be conveniently folded to the end surface of the body part 20, namely, the tab 211 included in the first tab set 21 is arranged in the same direction, and therefore the first tab set 21 can be folded to the end surface of the body part 20 only by clamping and bending the tabs 211 once through a clamp in the folding process. If the plurality of tabs 211 of the first tab set 21 are not in the same orientation, it is necessary to fold the first tab set 21 to the end surface of the body portion 20 by a plurality of times. And the plurality of tabs 211 are positioned at the same position, and the bending directions of the plurality of tabs 211 can be ensured to be consistent after the tabs 211 are folded once.
In an alternative embodiment of the present application, the plurality of first tab sets 21 are uniformly distributed on the end surface of the body portion 20.
Specifically, as shown in fig. 2 to 4, the plurality of first tab sets 21 are uniformly distributed on the end surface of the body portion 20, that is, the central angles between the adjacent first tab sets 21 are the same, or the distances between the adjacent first tab sets 21 are equal, and it should be noted that the adjacent first tab sets 21 are indicated as being adjacent in a clockwise direction or an anticlockwise direction.
The plurality of first tab assemblies 21 are uniformly distributed on the end face of the body part 20, so that the first tab assemblies 21 can be folded conveniently, and meanwhile, the first pole pieces in all directions can lead out current in the shortest distance, so that the led-out current is uniform.
It can be understood that, in the present embodiment, the number of the first tab sets 21 is two, the two first tab sets 21 are symmetrically disposed, and the area of the folded portion 213 formed after the two first tab sets 21 are folded is maximized by symmetrically disposing the two first tab sets 21.
In an alternative embodiment of the present application, the tab 211 is provided with a bent portion 212 bent in the transverse direction X, and the bent portion 212 is bent toward the axial center of the end surface of the battery cell 2.
Through setting up the kink 212 that horizontal X buckled with utmost point ear 211, make the first utmost point ear set 21 of constituteing by a plurality of utmost point ears 211 can have the part to cover and be used for welding with utmost point post 3 in the top of rolling up pinhole 201, simultaneously with the axis center of the buckling towards the terminal surface of electric core 2 of kink 212, make the part that lies in rolling up pinhole 201 top in utmost point ear 211 can cover rolling up pinhole 201 completely, but not the part covers, thereby utmost point ear 211 covers the welding area of first utmost point ear set 21 and utmost point post 3 that a plurality of utmost point ears 211 constitute through rolling up pinhole 201 completely, and then guaranteed the ability of overflowing between first utmost point ear set 21 and utmost point post 3.
In an alternative embodiment of the present application, as shown in fig. 6, the welded structure of the cylindrical battery further includes a protective sheet 22, and the protective sheet 22 is disposed between the folded portion 213 and the opening of the winding pin hole 201, and is connected to the folded portion 213.
Specifically, the protection sheet 22 is disposed between the folding portion 213 and the opening of the winding pin hole 201, the folding portion 213 formed by folding the plurality of first tab assemblies 21 is fixedly connected to the protection sheet 22 by ultrasonic welding, and then the first tab assemblies 21 are laser welded to the bottom of the electrode post 3. When the first tab assembly 21 is laser welded at the bottom of the electrode post 3, the welded tube passes through the winding pin hole 201, and the laser is emitted from the welded tube and sequentially penetrates through the protection sheet 22, the first tab assembly 21 and the bottom of the electrode post 3, so that the first tab assembly 21 is fixedly connected with the electrode post 3. The first tab assembly 21 can be prevented from cracking due to the laser directly acting on the first tab assembly 21 by the protective sheet 22. It is understood that protective sheet 22 may be located at an end face of body portion 20 and may be received in needle rolling hole 201.
In an alternative embodiment of the present application, the protective sheet 22 is at most entirely located in the roll pinhole 201, as projected in the longitudinal direction Y, with the protective sheet 22 being disposed in the roll pinhole 201.
Specifically, the fact that at most all of the protective sheet 22 is located in the winding pin hole 201 in the longitudinal direction Y projection means that the area of the protective sheet 22 is smaller than the area of the winding pin hole 201, so that the edges of the protective sheet 22 are all located within the edges of the winding pin hole 201. The protection sheet 22 is disposed in the winding pin hole 201, wherein the surface of the protection sheet 22 close to the folding portion 213 is optionally horizontal to the opening, which means that the protection sheet 22 is disposed in the winding pin hole 201 and does not exceed the opening surface of the winding pin hole 201. The protective sheet 22 is disposed in such a way that the protective sheet 22 does not occupy the longitudinal Y space inside the battery, and the protective sheet 22 can protect the first tab assembly 21 from being directly cracked by the laser during the laser welding process.
It should be noted that, the shape and structure of the protection sheet 22 are not specifically limited in the embodiment of the present application, and for example, the protection sheet 22 is a disk-shaped structure, and the diameter of the protection sheet 22 is smaller than or equal to the diameter of the winding needle hole 201, so that the protection sheet 22 can completely ensure that the first tab set 21 is not directly acted on by the laser. It is understood that the protection sheet 22 may also be a square disc or diamond disc structure as long as the protection sheet 22 is disposed in the pin hole 201 and can block the laser from directly acting on the first tab set 21.
In an alternative embodiment of the present application, as shown in fig. 1, the welded structure of the cylindrical battery further includes an insulating member 4, and the insulating member 4 is disposed between the end surface of the battery core 2 and the bottom wall 12.
Specifically, the insulating member 4 is disposed between the end surface of the battery cell 2 and the bottom wall 12, that is, the insulating member 4 is disposed between the first folded tab set 21 and the bottom wall 12, because the first tab set 21 is folded, most of the surface of one end of the battery cell 2 close to the bottom wall 12 is electrified after the tab 211 is folded, but the electrical property of the bottom wall 12 is different from the electrical property of the first tab set 21, so as to prevent the first tab set 21 from contacting the bottom wall 12 to cause a battery short circuit, and then the insulating member 4 is disposed between the end surface of the battery cell 2 and the bottom wall 12 to further insulate the first tab set 21 from the bottom wall 12.
In an alternative embodiment of the present application, as shown in fig. 7, the insulating member 4 is provided with a through hole 40, and the pole 3 is welded to the folded portion 213 through the through hole 40.
Specifically, the insulating member 4 is disposed between the end surface of the battery cell 2 and the cover assembly 5, so that a barrier layer is formed between the end surface of the battery cell 2 and the bottom wall 12, the first tab assembly 21 is located on the end surface of the battery cell 2, the terminal 3 is disposed on the bottom wall 12, and in order to ensure that the terminal 3 can be welded to the first tab assembly 21, the insulating member 4 is provided with a through hole 40 through which the terminal 3 can pass, and the terminal 3 passes through the through hole 40 and is laser welded to the tab 211.
In an alternative embodiment of the present application, as shown in fig. 7, the insulating member 4 includes a first insulating portion 41 and a second insulating portion 42, the through hole 40 is disposed in the first insulating portion 41, and the second insulating portion 42 is disposed around an edge of the first insulating portion 41 and extends toward an end surface of the battery cell 2.
Specifically, the first insulating portion 41 is disposed between the first tab set 21 and the bottom wall 12, the first tab set 21 is insulated from the bottom wall 12 by the first insulating portion 41, and the first tab set 21 is bent, so that the first tab set 21 has a side surface, and the second insulating portion 42 is disposed around the edge of the first insulating portion 41 and extends toward the end surface of the battery cell 2, that is, the second insulating portion 42 can surround the side surface of the first tab set 21, and the side surface of the first tab set 21 can be prevented from contacting the bottom wall 12 or the side wall 11 to cause a short circuit. By providing the insulating member 4 in the above-described structure, the insulating member 4 can completely wrap the surface of the first tab set 21, preventing the first tab set 21 from contacting the bottom wall 12 or the side wall 11.
As shown in fig. 7 to 8, the present application provides a cylindrical battery, which includes a casing 1 having an opening on one side and being hollow inside, a battery cell 2, a terminal post 3, and a cover assembly 5, wherein the battery cell 2 is accommodated in the casing 1, the cover assembly 5 is used for covering the opening of the casing 1, so that the battery cell 2 is installed in the casing 1, and the terminal post 3 is installed in the casing 1 through a sealing member 31. In order to ensure the electrical connection of the cylindrical battery, after the electric core 2 is placed into the casing, the first tab assembly 21 is connected with the terminal 3 by welding to form the above-mentioned welding structure for realizing the electrical connection. The cover assembly 5 includes a cover plate 51 and an insulating sealing ring 52 surrounding the cover plate 51, the second tab 23 is electrically connected to the cover plate 51 by welding, and the cover assembly 5 is mound-sealed with the casing 1 by the insulating sealing ring 52.
The cylindrical battery forms a folding part 213 by folding a plurality of first tab assemblies 21 to the end face of the body part 20, and the folding part 213 covers the opening of the winding needle hole 201, in the welding process, the welding tube welds the electrode post 3 and the folding part 213 located in the longitudinal direction Y projection of the winding needle hole 201 through the winding needle hole 201, and the first tab assemblies 21 are welded to the electrode post 3 through one welding. Compared with the prior art, the welding frequency is reduced without using a current collecting piece, poor welding such as insufficient welding and over-welding is reduced, current can be directly transmitted to the pole 3 from the first pole lug set 21 without being transmitted to the pole 3 through the current collecting piece, internal resistance is reduced, overcurrent capacity is increased, meanwhile, the first pole lug sets 21 are welded to the pole 3, the current can be transmitted to the pole 3 through the first pole lug sets 21, the internal resistance is reduced, and the overcurrent capacity of the battery is increased. In addition, owing to need not to use the mass flow piece, consequently also reduced the accessory, can occupy the inside vertical Y space of cylinder battery simultaneously when using the mass flow piece, consequently the inside vertical Y space of cylinder battery can also be saved to this application, and then the energy density of promotion battery.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art based upon the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a welded structure of cylinder battery utmost point post and utmost point ear which characterized in that includes:
the shell (1) comprises a side wall (11) and a bottom wall (12), wherein the side wall (11) is connected with the bottom wall (12), and the bottom wall (12) is provided with a through hole (121);
the battery cell (2) is accommodated in the shell (1), the battery cell (2) comprises a body part (20) and a first tab set (21) led out from the body part (20), the body part (20) is provided with a winding pin hole (201), the winding pin hole (201) penetrates through the end surfaces of two ends of the body part (20), wherein a plurality of first tab sets (21) are folded to the end surface of the body part (20) to form a folding part (213), and the folding part (213) covers the opening of the winding pin hole (201);
an electrode post (3), wherein the electrode post (3) passes through the through hole (121) and is fixedly connected to the bottom wall (12) through a sealing element (31), and the electrode post (3) is welded with the folding part (213).
2. The welding structure according to claim 1, wherein the body portion (20) is a wound structure formed by winding a first pole piece, a diaphragm and a second pole piece in sequence, and the first tab set (21) comprises tabs (211) led out of the first pole piece in any number of turns in the same orientation.
3. The welding structure according to claim 2, characterized in that the plurality of first tab sets (21) are evenly distributed on the end face of the body portion (20).
4. The welding structure according to claim 2, characterized in that the tab (211) is provided with a bent portion (212) bent in the transverse direction (X), and the bent portion (212) is bent toward the axial center of the end face of the battery cell (2).
5. The welded structure according to claim 1, characterized by further comprising a protective sheet (22), the protective sheet (22) being disposed between the folded portion (213) and the opening of the needle winding hole (201) and being connected to the folded portion (213).
6. The welding structure according to claim 5, characterized in that the protective sheet (22) is located at most entirely in the winding pin hole (201) in longitudinal direction (Y) projection, the protective sheet (22) being arranged in the winding pin hole (201).
7. The welding structure according to claim 1, characterized in that it further comprises an insulating member (4), said insulating member (4) being disposed between the end face of the cell (2) and the bottom wall (12).
8. The welded structure according to claim 7, characterized in that the insulating member (4) is provided with a through hole (40), and the pole (3) is welded to the folded portion (213) through the through hole (40).
9. The welding structure according to claim 8, wherein the insulating member (4) includes a first insulating portion (41) and a second insulating portion (42), the through hole (40) is provided in the first insulating portion (41), and the second insulating portion (42) is provided around an edge of the first insulating portion (41) and extends toward an end surface of the battery cell (2).
10. A cylindrical battery, characterized by comprising the welded structure of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220854188.6U CN217544857U (en) | 2022-04-14 | 2022-04-14 | Cylindrical battery and welding structure of pole column and pole lug thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220854188.6U CN217544857U (en) | 2022-04-14 | 2022-04-14 | Cylindrical battery and welding structure of pole column and pole lug thereof |
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| Publication Number | Publication Date |
|---|---|
| CN217544857U true CN217544857U (en) | 2022-10-04 |
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| CN202220854188.6U Active CN217544857U (en) | 2022-04-14 | 2022-04-14 | Cylindrical battery and welding structure of pole column and pole lug thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116895921A (en) * | 2023-09-11 | 2023-10-17 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery, electric equipment and welding method |
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2022
- 2022-04-14 CN CN202220854188.6U patent/CN217544857U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116895921A (en) * | 2023-09-11 | 2023-10-17 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery, electric equipment and welding method |
| CN116895921B (en) * | 2023-09-11 | 2024-02-20 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery, electric equipment and welding method |
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