CN220172328U

CN220172328U - Current collector and cylindrical battery

Info

Publication number: CN220172328U
Application number: CN202320466231.6U
Authority: CN
Inventors: 肖泽强; 屈永辉; 李聪; 纪荣进; 王诗龙; 陈杰
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2023-03-13
Filing date: 2023-03-13
Publication date: 2023-12-12
Anticipated expiration: 2033-03-13

Abstract

The utility model belongs to the technical field of lithium ion battery processing, and particularly relates to a current collector and a cylindrical battery, which comprise a main body part and valve bodies, wherein a plurality of valve bodies are arranged at intervals along the circumferential direction of the main body part, welding grooves are formed in the valve bodies, gaps are reserved among the valve bodies, the coverage area of the current collector on the rolling flat end face of a winding core can be effectively reduced, and electrolyte can pass through the gaps during liquid injection, so that the wetting effect and the wetting efficiency of the battery are improved; meanwhile, the welding grooves formed in the petal body can obviously improve the welding yield; and then a fusing groove is formed at the joint of the tail body of the main body positive current collector and the main body, so that the fuse can be used as a fusing fuse when short-circuit overcurrent occurs, the safety performance is obviously improved, and meanwhile, the tab is convenient to bend.

Description

Current collector and cylindrical battery

Technical Field

The utility model belongs to the technical field of lithium ion battery processing, and particularly relates to a current collector and a cylindrical battery.

Background

At present, the lithium battery adopts a full tab route, namely, the winding core and the battery terminal are connected with the top cover through the current collector, and the structure has the advantages of low internal resistance and capability of meeting the charge and discharge of super-multiplying power.

The existing lithium ion battery current collector is applied to a large-capacity cylindrical lithium ion battery, such as a cylindrical lithium ion battery with the diameter of 26mm or more, the current collector is welded on the end face of the rolled tab, the effect of the current collector is to conduct current between an internal pole piece and an external pole of the battery, and the current collector is not suitable for a full-tab cylindrical lithium ion battery with the diameter of 21mm due to different production processes, meanwhile, the design structure of the main body part is high in tightness, electrolyte is not easy to infiltrate a winding core after the current collector is welded on the end face of the tab, and the efficiency of the battery can be influenced.

Disclosure of Invention

The utility model aims at: aiming at the defects of the prior art, a current collector is provided to solve the problem that the existing structure is unfavorable for the electrolyte to infiltrate the battery cell and the welding effect is poor.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a current collector, characterized by: the novel valve comprises a main body part and valve bodies, wherein a plurality of valve bodies are arranged at intervals along the circumferential direction of the main body part, and welding grooves are formed in the valve bodies.

As a preferred embodiment of the utility model, two adjacent petals are connected by a first circular arc, and the edges of the petals are provided with a second circular arc.

As a preferred embodiment of the utility model, three petals are provided, and the included angle between two adjacent petals is 120 degrees.

As a preferred embodiment of the present utility model, the welding groove is provided therein with a weld pattern, and the weld pattern is a dot pattern or a continuous line pattern.

As a preferred embodiment of the utility model, it further comprises a tail body connected to one of the petals.

As a preferred embodiment of the utility model, a fusing part is arranged at the connecting part between the tail body and the flap body, and the fusing part is a fusing notch, a fusing groove, a fusing hole or a fusing cavity.

As a preferred embodiment of the present utility model, a welding area or a through hole is provided in the middle of the main body.

As a preferred embodiment of the utility model, the welding zone is provided with a boss.

As a preferred embodiment of the present utility model, the cross-sectional shape of the boss is circular, elliptical, rectangular, diamond-shaped or trapezoidal.

The utility model also provides a cylindrical battery comprising the current collector.

This novel beneficial effect of use: the utility model provides a current collector solution, which comprises a main body part and valve bodies, wherein a plurality of valve bodies are arranged at intervals along the circumferential direction of the main body part, welding grooves are formed in the valve bodies, gaps are reserved among the valve bodies, the coverage area of the current collector on the rolling flat end face of a winding core can be effectively reduced, and electrolyte can pass through the gaps when injected, so that the infiltration effect and the infiltration efficiency of a battery are improved; meanwhile, the welding grooves formed in the petal body can obviously improve the welding yield;

and then a fusing groove is formed at the joint of the tail body of the main body positive current collector and the main body, so that the fuse can be used as a fusing fuse when short-circuit overcurrent occurs, the safety performance is obviously improved, and meanwhile, the tab is convenient to bend.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to fig. 1 to 4.

FIG. 1 is a schematic view of the overall structure of a negative current collector of the present utility model;

fig. 2 is a schematic view of the overall structure of the positive current collector of the present utility model;

FIG. 3 is a schematic view of the structure of the present utility model fuse;

fig. 4 is another schematic structure of the fusing part of the present utility model.

In the figure: 1. a negative current collector; 2. a positive current collector; 3. welding grooves; 4. a first arc; 5. welding lines; 6. a boss; 7. a tail body; 8. a fusing part; 9. a through hole; 10. a valve body; 11. a second arc; 12. a fusing groove; 13. fusing hole, 14, main part.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present utility model, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 4, but the present utility model is not limited thereto.

The utility model relates to a current collector, which comprises a main body part 14 and valve bodies 10, wherein a plurality of valve bodies 10 are circumferentially arranged at intervals along the main body part 14, welding grooves 3 are formed on the valve bodies 10, a gap is formed between two adjacent valve bodies 10, welding grooves 33 are formed on the valve bodies 10, and the width b of each valve body 10 is 6mm.

As a preferred embodiment of the utility model, the included angle between two adjacent valve bodies 10 is 120 degrees, meanwhile, the two adjacent valve bodies 10 are connected through the first circular arc 4, the coverage area of the main body part 14 on the rolling core rolling flat end surface can be reduced through the connection of the first circular arc 4, the liquid injection effect is improved, the liquid injection efficiency is improved, the diameter of the first circular arc 4 is 9mm, the diameter of the second circular arc 11 is 6mm, and the edge part of the valve body 10 is provided with the second circular arc 11, so that the valve body 10 can be conveniently installed in a cylindrical shell.

As a preferred embodiment of the present utility model, the welding grooves 3 are provided with the welding lines 5, the welding lines 5 can be circular or polygonal, the welding lines 5 are provided for facilitating the connection of the current collector and the roll core flat end surface, the welding lines 5 are provided with different shapes for better fixing the current collector and the roll core, the depth of the welding grooves 3 is 0.5mm, the welding grooves 3 are symmetrically arranged on the flap body 10 along the central axis of the main body 14, and the back surface of the welding grooves 3 are welded with the roll-shaped roll flat surface by laser.

As a preferred embodiment of the utility model, the boss 6 is arranged at the center of the main body 14 of the negative current collector 1, the boss 6 can also be round or polygonal, the boss 6 is arranged to facilitate the welding of the current collector and the cap, and the patterns on the boss 6 are arranged in different patterns, so that the welding effect of the current collector and the cap or the shell can be effectively improved, and the welding yield is improved.

As shown in fig. 2, as a preferred embodiment of the present utility model, a fusing part 8 is formed at the connection between the main body 14 and the tail body 7, the fusing part 8 fuses the gap, and the diameter of the gap is 2mm.

As shown in fig. 3, in the second embodiment of the fusing part of the present utility model, the fusing part 8 is a fusing groove having a long strip shape.

As shown in fig. 4, as a third embodiment of the fusing part of the present utility model, the fusing part 8 is a fusing through hole constituted by a row of through holes having a diameter of 1.5 mm.

Specifically, the tail body 7 and one of the petals 10 on the positive current collector 2 are integrally arranged, the two sides of the tail body 7 are provided with the fusing parts 8, and the grooves can prevent the cylindrical battery from being short-circuited to cause explosion, fire and other risks.

Specifically, when the battery takes place the short circuit and overflows, the too big electric current can be followed fusing 8 departments with tail body 7 and fused, and tail body 7 can also conveniently roll up core assembly in-process utmost point ear and buckle simultaneously, and the one end and the block of tail body 7 are in the same place through laser welding.

As a preferred embodiment of the present utility model, the positive current collector 2 is provided with a through hole 9 at the center thereof, the through hole 9 having a diameter of 3mm communicating with the center hole of the winding core for passing the welding pin when the bottom negative current collector 1 is welded.

As a preferred embodiment of the present utility model, the through hole 9 is 3 to 5mm, specifically, the diameter of the through hole is 3mm, 3.3mm, 3.8mm, 4mm, 4.3mm, 4.8mm or 5mm.

The utility model is further illustrated by the following examples:

example 1

The current collector of this embodiment is the negative electrode current collector 1.

As shown in fig. 1, the anode current collector 1 includes a main body 14 and a plurality of petals 10, the petals 10 are circumferentially spaced along the main body 14, and the petals 10 are provided with welding grooves 3.

Compared with the prior art, the current collector provided by the embodiment of the utility model can effectively reduce the coverage area of the current collector on the rolling core flat end surface, and electrolyte can pass through the gap during liquid injection, so that the infiltration effect and the infiltration efficiency of a battery are improved; meanwhile, the welding grooves 3 formed in the valve body 10 can obviously improve the welding yield; and then, a fusion groove is formed at the joint of the tail body 7 and the flap body 10, so that the fusion fuse can be used as a fusion fuse when short-circuit overcurrent occurs, the safety performance is obviously improved, and meanwhile, the lug is convenient to bend.

Further, two adjacent valve bodies 10 are connected through a first circular arc 4, and the edge of each valve body 10 is provided with a second circular arc 11. The circular arcs are arranged between two adjacent valve bodies 10, so that electrolyte can be more conveniently infiltrated into the battery cell, the current collector is applied to the cylindrical battery, and the second circular arcs 11 are arranged at the edges of the valve bodies 10, so that the current collector can be conveniently installed in the cylindrical battery.

Further, three petals 10 are provided, and an included angle a between two adjacent petals 10 is 120 °. The stability of the current collector structure can be effectively ensured by setting the included angle between the valve bodies 10 to 120 degrees.

Further, the welding groove 3 is internally provided with welding lines 5, and the welding lines 5 can be in a dot shape or a continuous line shape. The current collector and the battery cell can be better fixed through the welding lines 5, and the welding lines 5 are arranged in a punctiform or continuous line shape, so that the welding firmness can be added.

Example two

Unlike the first embodiment, the following is:

the middle of the body portion 14 is provided with a weld zone. The welding area arranged in the middle can fix the current collector and the cap together through welding, and the current collector and the cap are not easy to fall off.

Further, the welding zone is provided with a boss 6. The boss 6 is also used for increasing the firmness of welding, and the shell and the current collector are separated due to random shaking when the welding is not completed.

Further, the cross-sectional shape of the boss 6 is circular, elliptical, rectangular, diamond-shaped or trapezoidal. The irregular shape can increase the surface area of the welding surface, thereby being more convenient for welding. Other structures are the same as those of the first embodiment, and will not be described here again.

Example III

Unlike the first embodiment, the following is: the current collector of the embodiment of the present utility model is the positive current collector 2.

As shown in fig. 2, the collector further comprises a tail body 7, the tail body 7 being connected to one of the petals 10. The tail body 7 is arranged to facilitate the fixation between the current collector and the cap during installation.

Other structures are the same as those of the first embodiment, and will not be described here again.

Example IV

Unlike the third embodiment, the following is:

the junction between the tail body 7 and the flap body 10 is provided with a fusing part 8. When short-circuit overcurrent occurs, the device can act as a fuse to cut off the connection between the tail body 7 and the current collector, and prevent the phenomena of explosion, fire and the like of the battery caused by short circuit.

Specifically, the fusing part 8 is a fusing notch, a fusing groove, a fusing hole or a fusing cavity.

As shown in fig. 2, when the fusing part 8 is a fusing gap, two arc gaps are provided on both sides of the tail body 7, and a large current disconnects the current collector from the tail body 7 through the fusing gap during a short circuit.

As shown in fig. 3, when the fusing part 8 is a fusing groove 12, the middle part of the tail body 7 is provided with the fusing groove 12 in the same direction as the width of the tail body 7, and the connection is weak during short circuit, and the tail body 7 can be easily disconnected from the current collector by high current during short circuit.

As shown in fig. 4, when the fusing part 8 is a fusing hole, the fusing holes 13 are arranged on the tail body 7 at equal intervals along the same direction as the width of the tail body 7, and the fusing holes 13 ensure that the tail body 7 can be easily disconnected from the current collector by high current when the battery is short-circuited, and meanwhile, the tail body 7 is not too fragile.

Other structures are the same as those of the embodiment, and are not described here again.

Example five

Unlike the third embodiment, the following is:

as shown in fig. 2, the middle of the main body portion 14 is provided with a through hole 9. The middle part of the positive current collector is provided with a through hole 9, the cylindrical battery is formed by welding a rubbing plane of the negative current collector 1 and the battery core, then welding a rubbing plane of the positive current collector disk and the other end of the battery core, putting the battery core into a cylindrical battery shell after welding, and at the moment, the situation that the shell and the current collector key are welded together on the basis of not damaging the negative shell or a cap from the outside is found to be impossible, so that when the shell and the negative current collector 1 are stacked together, a welding needle downwards extends into the through hole 9 in the middle part of the positive current collector to weld the negative current collector 1 and the shell.

Other structures are the same as those of the embodiment, and are not described herein.

Example six

The present embodiment provides a cylindrical battery including a cylindrical case, a winding core, a positive electrode cap, a negative electrode cap, and the current collector of any one of the first to fifth embodiments. Specifically, a winding core is arranged in a cylindrical shell, then an anode current collecting piece 2 and a cathode current collecting piece 1 are respectively arranged at two ends of the winding core, a welding groove 3 of the anode current collecting piece 1 and a kneading plane of the winding core are welded together through laser, the anode current collecting piece 1 is firmly fixed at two ends of the winding core, a cathode cap is arranged at the bottom of a battery, namely below the cathode current collecting piece 1, a welding needle for welding penetrates through a through hole 9 on the anode current collecting piece 2 and is arranged at a boss 6 of the cathode current collecting piece 1, the cathode current collecting piece 1 and the cathode cap are welded together, finally one end of the tail of the anode current collecting piece 2 is welded with the anode cap, after welding, a part with more tail is placed in the cylindrical shell, and finally the anode cap is covered.

Furthermore, it should be understood that although the present disclosure describes embodiments in terms of embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should understand that the technical solutions in each embodiment may be combined appropriately to form other embodiments that can be understood by those skilled in the art.

Variations and modifications of the above-described embodiments will occur to those skilled in the art upon reading the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims

1. A current collector, characterized by: the novel valve comprises a main body part and valve bodies, wherein a plurality of valve bodies are arranged at intervals along the circumferential direction of the main body part, and welding grooves are formed in the valve bodies.

2. A current collector according to claim 1 wherein: the two adjacent valve bodies are connected through a first arc, and the edges of the valve bodies are provided with a second arc.

3. A current collector according to claim 1 wherein: the valve bodies are three, and the included angle between every two adjacent valve bodies is 120 degrees.

4. A current collector according to claim 1 wherein: welding lines are arranged in the welding grooves, and the welding lines are in a dot shape or a continuous line shape.

5. A current collector according to claim 1 wherein: the valve body also comprises a tail body, and the tail body is connected with one of the valve bodies.

6. A current collector according to claim 5, wherein: the junction between the tail body and the lamella body is provided with the fusing part, the fusing part is fusing breach, fusing recess, fusing hole or fusing chamber.

7. A current collector according to claim 1 wherein: the middle part of the main body part is provided with a welding area or a through hole.

8. A current collector according to claim 7 wherein: the welding area is provided with a boss.

9. A current collector according to claim 8 wherein: the cross section of the boss is round, oval, rectangular, diamond or trapezoid.

10. A cylindrical battery characterized in that: a current collector comprising any one of claims 1-9.