CN115117565A

CN115117565A - Converge subassembly and cylinder battery

Info

Publication number: CN115117565A
Application number: CN202210965576.6A
Authority: CN
Inventors: 朱小平; 卜相楠
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-09-27

Abstract

The invention provides a confluence assembly and a cylindrical battery, which comprise a confluence disc and a cover plate, wherein the confluence disc is provided with a confluence surface and a connecting surface opposite to the confluence surface, the cover plate is provided with a butt joint surface and an exposed surface opposite to the butt joint surface, the confluence disc is provided with a first groove body, the first groove body protrudes from the confluence surface to the direction far away from the confluence surface through the connecting surface, the cover plate is provided with a second groove body, the second groove body protrudes from the butt joint surface to the direction far away from the butt joint surface through the exposed surface, and the first groove body extends into the second groove body so as to enable the cover plate to be connected with the confluence disc. According to the invention, based on the concave-convex fit of the first groove body and the second groove body, the positioning problem in the manufacturing process can be solved, and the tolerance of the winding core can be eliminated; moreover, but the dish of converging can the lug connection or combine to pierce through welded connection together with the apron to effectively solved the difficult problem that the bus bar piece is connected with the casing, owing to pierce through the welding and can go on in the casing outside, thereby can effectively reduce the inside risk that core metal fillings were introduced of winding core of casing.

Description

Converge subassembly and cylinder battery

Technical Field

The invention relates to the technical field of batteries, in particular to a confluence assembly and a cylindrical battery.

Background

In the existing cylindrical battery, a bus sheet is mostly of an integral structure and is divided into a plane and a vertical edge, the plane adopts a circular hole opening mode, and the vertical edge is mainly used for being welded with a shell in a bus mode; the cover plate is mostly made by a roll groove process, and C-shaped or cross-shaped nicks are arranged on the cover plate. In addition, because the confluence sheet and the shell adopt an internal welding mode to realize shell confluence, the welding mode easily generates metal scraps in the shell and is not easy to clean, and the materials with large welding requirement energy are welded to the materials with small welding requirement energy, so that the phenomena of insufficient welding and over-welding are easily caused, the insufficient welding easily generates over-current badness, and the over-welding easily causes the damage of a nickel coating on the surface of the shell to cause rusting.

Disclosure of Invention

The present invention is directed to a bus bar assembly, which at least partially solves the above problems.

The confluence assembly comprises a confluence disc and a cover plate;

the confluence disc is provided with a confluence surface and a connection surface opposite to the confluence surface;

the cover plate is provided with a butt joint surface and an exposed surface opposite to the butt joint surface;

the confluence disc is provided with a first groove body, and the first groove body protrudes from the confluence surface to the direction far away from the confluence surface through the connecting surface; the cover plate is provided with a second groove body, and the second groove body protrudes from the butt joint surface to the direction far away from the butt joint surface through the exposed surface; the first groove body extends into the second groove body so that the cover plate is connected with the confluence disc.

Optionally, the first groove body has a protruding height relative to the connecting surface, the second groove body has a recessed depth relative to the abutting surface, and the protruding height is greater than the recessed depth, so that an interval is formed between the abutting surface and the connecting surface.

Optionally, the center of the confluence disc is provided with a through hole penetrating through the confluence surface and the connection surface, the edge of the through hole extends along the radial direction of the confluence disc to form a plurality of slots, and the plurality of slots divide the confluence disc into a plurality of segments.

Optionally, the first slot body is located at the periphery of the slot hole, the first slot body includes a plurality of first segment slot bodies, the first segment slot bodies are arranged at intervals along the circumferential direction of the confluence disc, every two adjacent first segment slot bodies are spaced apart by a first spacer, and an extension line of the slot hole in a direction away from the through hole is located on the first spacer.

Optionally, the second slot body comprises a plurality of second segment slot bodies, the plurality of second segment slot bodies are arranged at intervals along the circumferential direction of the cover plate, every two adjacent second segment slot bodies are separated by a second separation body, and the projection of the second separation body towards the direction of the confluence disc falls into the first separation body.

Optionally, the cover plate is concavely provided with a notch from the exposed surface to the abutting surface, so as to form a fan-shaped explosion-proof area corresponding to the split body on the cover plate.

Optionally, the cover plate has a connecting protrusion in the middle portion, and the connecting protrusion extends from the abutting surface to a direction away from the exposed surface so as to be capable of extending into the through hole.

Optionally, the cover plate is provided with an annular bead around the coupling protrusion.

Optionally, the connecting protrusion is provided with a through hole to form a liquid injection port.

According to another aspect of the present invention, there is also provided a cylindrical battery, including a cylindrical casing with an opening at least one end, and a winding core accommodated in the casing, and further including the above-mentioned bus bar assembly, the bus bar assembly being disposed at the opening of the casing to connect with the winding core and close the opening.

According to the invention, based on the arrangement of the first groove body and the second groove body, the positioning problem in the manufacturing process can be solved, and the tolerance of the winding core can be eliminated; moreover, but the dish of converging can the lug connection or combine to pierce through welded connection together with the apron to effectively solved the difficult problem that the bus bar piece is connected with the casing, owing to pierce through the welding and can go on in the casing outside, thereby can effectively reduce the inside risk that core metal fillings were introduced of winding core of casing.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

FIG. 1 is a schematic diagram of a cylindrical battery according to an exemplary embodiment of the present invention (core removed);

fig. 2 is a front view of a jelly roll of a cylindrical battery according to an exemplary embodiment of the present invention;

fig. 3 is a schematic structural view of a bus bar assembly of a cylindrical battery according to an exemplary embodiment of the present invention;

FIG. 4 is a cross-sectional view of the bus bar assembly of FIG. 3;

FIG. 5 is an exploded view of the bus bar assembly of FIG. 3;

fig. 6 is a perspective view of a cover plate of the bus bar assembly of fig. 5.

The reference numbers in the figures illustrate:

10. a housing; 101. a top end; 102. a bottom end; 20. a winding core; 201. a first end; 202. a second end; 211. a first welding plane; 212. a second welding plane; 30. a bus assembly; 31. a confluence disc; 3101. a converging surface; 3102. a connecting surface; 311. a first tank body; 3111. a first segmented tank body; 312. a through hole; 313. a slot; 314. a first separator; 315. a split body; 32. a cover plate; 3201. a butt joint surface; 3202. exposing the noodles; 321. a second tank body; 3211. a second sectional tank body; 322. a second separator; 323. scoring; 3231. a sector explosion-proof area; 324. a connecting projection; 325. an annular reinforcing rib; 326. a through hole.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 6, a cylindrical battery according to one embodiment of the present invention includes a can 10, a jelly roll 20, and a bus bar assembly 30.

The housing 10 has a cylindrical structure and at least one end is open, the housing 10 may be made of metal, the housing 10 has a top end 101 and a bottom end 102, the opening is disposed on the top end 101 or the bottom end 102, or both the top end 101 and the bottom end 102 are provided with openings.

The winding core 20 is housed in the case 10, and as shown in fig. 2, the winding core 20 has a first end 201 and a second end 202, the first end 201 has a plurality of first tabs (not shown in the figure), the plurality of first tabs may be positive tabs, the plurality of first tabs are shaped to form a first welding plane 211 at the first end 201, the second end 202 has a plurality of second tabs (not shown in the figure), the plurality of second tabs may be negative tabs, and the plurality of second tabs are shaped to form a second welding plane 212 at the second end 202.

The bus bar assembly 30 is disposed at the opening of the housing 10 to connect to the winding core 20 and close the opening. Specifically, referring to fig. 3, 4, 5 and 6 in combination, the bus bar assembly 30 includes a bus bar plate 31 and a cover plate 32. The bus bar 31 has a bus bar surface 3101 and a connecting surface 3102 opposite to the bus bar surface 3101, when the opening of the housing 10 is arranged at the bottom end 102 of the housing 10, the bus bar surface 3101 is used for being abutted against the second welding plane 212 of the winding core 20, when the opening of the housing 10 is arranged at the top end 101 of the housing 10, the bus bar surface 3101 is used for being abutted against the first welding plane 211 of the winding core 20, the bus bar 31 is provided with a first groove body 311, the first groove body 311 protrudes from the bus bar surface 3101 through the connecting surface 3102 in a direction away from the bus bar surface 3101, that is, a part of the first groove body 311 protrudes on the connecting surface 3102 to form a protruding part. The cover plate 32 has an abutting surface 3201 and an exposed surface 3202 disposed opposite to the abutting surface 3201, the abutting surface 3201 is opposite to the connecting surface 3102, the cover plate 32 is provided with a second groove body 321, the second groove body 321 protrudes from the abutting surface 3201 through the exposed surface 3202 in a direction away from the abutting surface 3201, that is, the second groove body 321 forms a groove portion opposite to the abutting surface 3201. The first groove 311 extends into the second groove 321 (i.e., the protrusion and the groove cooperate) to connect the cover plate 32 and the bus bar 31 into a whole.

In the junction assembly 30 of the present invention, the junction between the junction plate 31 and the cover plate 32 can be achieved by the convex-concave fit relationship between the first slot body 311 and the second slot body 321; moreover, the first slot body 311 and the second slot body 321 form a contact surface which can be welded; furthermore, the interference fit between the first slot body 311 and the second slot body 321 can also eliminate the tolerance of the winding core 20.

Referring to fig. 4, the first groove 311 has a protruding height relative to the connecting surface 3102, the second groove 321 has a recessed depth relative to the abutting surface 3201, and the protruding height is greater than the recessed depth, so that a space is formed between the abutting surface 3201 and the connecting surface 3102, and thus, the bus tray 31 and the cover plate 32 have a planar fit function, and an axial yielding space, so that the tolerance of the winding core 20 can be eliminated.

Referring to fig. 4 and 5, the middle of the bus bar 31 has a through hole 312 penetrating through the bus bar surface 3101 and the connection surface 3102, the through hole 312 is mainly used for entering electrolyte, the edge of the through hole 312 extends along the radial direction of the bus bar 31 to form a plurality of slots 313, the bus bar 31 is divided into a plurality of segments 315 by the plurality of slots 313, here, the bus bar 31 adopts an internal free-segment structure, the segment opening mode is that the segment is opened from the center of the bus bar 31 to the outside in the radial direction, and when the bus bar 31 is connected with the winding core 20, each segment 315 can be welded with the first welding plane 211 or the second welding plane 212 of the winding core 20, so that the problem that the welding plane of the bus bar and the winding core 20 is consistent, and gas cannot be quickly released to the outside can be solved.

Here, many slotted holes 313 are whole can be the cross form to make the confluence disc 31 be the cross and cut apart, the cross is cut apart and becomes confluence disc 31 by a whole four free split bodies 315, the eliminating welding department stress that can be fine when welding with book core 20, with two big circular surface contacts of whole, becomes a big circular surface and four sector face contacts, can not only guarantee the welding effect, four free split bodies 315 can make things convenient for gaseous can directly not have the resistance blowout simultaneously, form safety protection. It should be understood that the plurality of slots 313 are not limited to being cross-shaped, as long as the gas ejection is facilitated.

In an embodiment of the present invention, the first slot body 311 is located at the periphery of the slot 313, and the first slot body 311 includes a plurality of first segment slot bodies 3111, the plurality of first segment slot bodies 3111 are arranged at intervals along the circumferential direction of the bus tray 31, every two adjacent first segment slot bodies 3111 are spaced apart by the first spacer 314, an extension line of the slot 313 in a direction away from the through hole 312 is located on the first spacer 314, and the first spacer 314 is provided to facilitate not only the matching of the cover plate 32 and the bus tray 31, but also the stress release of the first slot body 311.

Referring to fig. 4 and 5 again, the second groove body 321 includes a plurality of second segment groove bodies 3211, the plurality of second segment groove bodies 3211 are arranged at intervals along the circumferential direction of the cover plate 32, every two adjacent second segment groove bodies 3211 are spaced apart by a second spacer 322, and a projection of the second spacer 322 toward the direction of the junction plate 31 falls into the first spacer 314. In this manner, the second spacers 322 on the cover plate 32 substantially conform to the first spacers 314 on the manifold plate 31, and function well to position and relieve stress.

As shown in fig. 6, the cover plate 32 is concavely provided with a notch 323 from the exposed surface 3202 toward the abutting surface 3201 to form a fan-shaped explosion-proof area 3231 corresponding to the petal 315 on the cover plate 32. In this way, the sector shaped explosion-proof area 3231 matches the position and shape of the segment 315 of the bus bar 31, and the sector shaped explosion-proof area 3231 of the cover plate 32 can be opened synchronously when the segment 315 of the bus bar 31 is opened.

Further, the cover plate 32 has a connecting protrusion 324 in the middle, the connecting protrusion 324 extends from the abutting surface 3201 toward the direction away from the exposed surface 3202 to extend into the through hole 312, and the interference fit between the connecting protrusion 324 and the through hole 312 can realize the coarse positioning between the confluence plate 31 and the cover plate 32.

Referring to fig. 4, 5 and 6, the cover plate 32 is provided with an annular rib 325 around the coupling protrusion 324, and the cover plate 32 is secured to be stress-released by the annular rib 325 to protect the notch 323.

In the embodiment of the present invention, the connection protrusion 324 is provided with a through hole 326 to form a liquid inlet, which is mainly used for the entry of the electrolyte. It should be understood that the liquid injection port can be retained and removed according to actual conditions according to different product process routes.

When the current collecting assembly 30 of the embodiment of the invention is applied to a cylindrical battery, each split 315 of the current collecting disc 31 is welded with the winding core 20, the cover plate 32 is fed after the welding is completed, the second groove body 321 on the cover plate 32 is matched with the first groove body 311 of the current collecting disc 31, and the first groove body 311 and the second groove body 321 are in interference fit in height, so that the plane attaching effect is achieved, meanwhile, downward pressing is also started, and the tolerance effect of the winding core 20 is eliminated.

In the application process, after the second slot body 321 is in contact with the first slot body 311, the second slot body 321 may penetrate from the outside (where "outside" is relative to the housing 10) to the inside and be welded with the first slot body 311, so as to ensure that the cover plate 32 is fixedly connected with the bus bar 31, and certainly, if the requirement on the overcurrent capacity of the battery in actual use is not high, the second slot body 321 is directly connected with the first slot body 311 in an interference fit manner, and overcurrent can be realized without welding. When the battery fails, the gas in the winding core 20 rushes through the split body 315 formed by dividing the slot hole 313 of the confluence disc 31, the split body 315 is opened outwards to form a gas direct-current channel, and the gas directly rushes to the fan-shaped explosion-proof area 3231 of the cover plate 32, and the fan-shaped explosion-proof area 3231 and the split body 315 are basically consistent in shape, so that the gas can directly break an explosion-proof line, and the pressure is released at the first time to form safety protection.

In summary, the cylindrical battery adopting the bus bar assembly 30 of the present invention has the following advantages:

1. through unsmooth cooperation hard link mode, perhaps, combine on unsmooth cooperation hard link mode basis) external welding mode, will converge and shift with casing 10 welding difficult problem, avoided the production overcurrent that rosin joint produced bad and the casing 10 surface nickel coating destruction that overwelding leads to and the phenomenon of rustting.

2. Welding is performed outside the winding core 20, avoiding weld metal filings inside the winding core 20.

3. The manifold assembly 30 is formed by the mating of the cover plate 32 and the manifold plate 31 to facilitate field positioning and manufacturability.

4. The tolerance of the winding core 20 can be effectively eliminated by matching the cover plate 32 and the bus disc 31.

5. The bus disc 31 adopts an internal free split structure, so that the problems that the flatness of the welding plane of the winding core 20 is poor, the stress cannot be released when the bus sheet is integrally pressed, and the welding is poor can be solved.

6. The free valving structure inside the confluence disc 31 corresponds to the fan-shaped explosion-proof area 3231 of the cover plate 32, so that gas release is facilitated.

7. The cover plate 32 adopts a fan-shaped anti-explosion, convex welding and liquid injection integrated structure, and the structure is simple.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation terms is generally based on the orientation or positional relationship shown in the drawings, and is for convenience of description and simplicity of description only, and in the event that the description is not made to the contrary, these orientation terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

Spatially relative terms, such as "above … …", "above … …", "on … …", "above", and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features to other components or features as illustrated in the figures. It is understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be oriented at 0 at various other angles (e.g., rotated 90 degrees or at other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A bus bar assembly (30) comprising a bus bar tray (31) and a cover plate (32);

the confluence disc (31) is provided with a confluence surface (3101) and a connection surface (3102) arranged opposite to the confluence surface (3101);

the cover plate (32) is provided with a butt joint surface (3201) and an exposed surface (3202) opposite to the butt joint surface (3201);

the confluence disc (31) is provided with a first groove body (311), and the first groove body (311) protrudes from the confluence surface (3101) to a direction away from the confluence surface (3101) through the connecting surface (3102); the cover plate (32) is provided with a second groove body (321), and the second groove body (321) protrudes from the butt joint surface (3201) to the direction far away from the butt joint surface (3201) through the exposed surface (3202); the first groove body (311) extends into the second groove body (321) so that the cover plate (32) is connected with the confluence disc (31).

2. The bus bar assembly (30) of claim 1, wherein the first slot (311) has a protruding height relative to the connection surface (3102), and the second slot (321) has a recessed depth relative to the mating surface (3201), the protruding height being greater than the recessed depth to provide a spacing between the mating surface (3201) and the connection surface (3102).

3. The bus bar assembly (30) according to claim 1 or 2, wherein the bus bar (31) has a through hole (312) extending through the bus bar surface (3101) and the connecting surface (3102) at a central portion thereof, and a plurality of slot holes (313) extending from an edge of the through hole (312) in a radial direction of the bus bar (31), the plurality of slot holes (313) dividing the bus bar (31) into a plurality of segments (315).

4. The confluence assembly (30) according to claim 3, wherein the first slot body (311) is located at the periphery of the slot hole (313), and the first slot body (311) comprises a plurality of first segment slot bodies (3111), the first segment slot bodies (3111) are arranged at intervals along the circumferential direction of the confluence disc (31), every two adjacent first segment slot bodies (3111) are spaced apart by a first spacer (314), and an extension line of the slot hole (313) towards a direction away from the through hole (312) is located on the first spacer (314).

5. The bus bar assembly (30) according to claim 4, wherein the second groove body (321) comprises a plurality of second segment groove bodies (3211), the plurality of second segment groove bodies (3211) are arranged at intervals along the circumferential direction of the cover plate (32), every two adjacent second segment groove bodies (3211) are separated by a second separating body (322), and the projection of the second separating body (322) towards the direction of the bus bar disc (31) falls into the first separating body (314).

6. The bus bar assembly (30) according to claim 3, wherein the cover plate (32) is concavely provided with a notch (323) from the exposed surface (3202) toward the abutting surface (3201) to form a fan-shaped explosion-proof region (3231) corresponding to the split body (315) on the cover plate (32).

7. The bus bar assembly (30) of claim 3, wherein the cover plate (32) has a connecting protrusion (324) in a middle portion thereof, the connecting protrusion (324) extending from the abutting surface (3201) in a direction away from the exposed surface (3202) to be insertable into the through hole (312).

8. The bus bar assembly (30) of claim 7, wherein the cover plate (32) is provided with an annular bead (325) around the coupling protrusion (324).

9. The bus bar assembly (30) according to claim 7, wherein the connecting protrusion (324) is provided with a through hole (326) to form a liquid injection port.

10. A cylindrical battery comprising:

a housing (10) of cylindrical configuration and open at least at one end; and

a winding core (20) housed in the case (10);

-a bus bar assembly (30) according to any of claims 1 to 9, wherein the bus bar assembly (30) is arranged at the opening of the shell (10) for connecting to the winding core (20) and closing the opening.