CN219419442U

CN219419442U - Cylindrical battery

Info

Publication number: CN219419442U
Application number: CN202320174489.9U
Authority: CN
Inventors: 曲鹏伟
Original assignee: Weilai Battery Technology Anhui Co ltd
Current assignee: Weilai Battery Technology Anhui Co ltd
Priority date: 2023-01-18
Filing date: 2023-01-18
Publication date: 2023-07-25
Anticipated expiration: 2033-01-18

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly provides a cylindrical battery. The electrode lug and the connecting sheet are welded to cause inconsistent welding and low production efficiency when the conventional cylindrical battery is produced. The cylindrical battery comprises a battery shell, a winding core and a connecting sheet which are positioned in the battery shell, and an anode connecting piece and an end cover which are positioned at two ends of the battery shell, wherein the two ends of the winding core are respectively provided with an anode lug and a cathode lug, the two ends of the connecting sheet are respectively contacted with the anode lug and the anode connecting piece, and the connecting sheet is electrically connected with the anode lug and the anode connecting piece. The cylindrical battery does not need welding, the positive electrode lug and the positive electrode connecting piece are electrically connected through the connecting piece, the assembly is convenient, and the production efficiency is high.

Description

Cylindrical battery

Technical Field

The utility model belongs to the technical field of lithium batteries, and particularly provides a cylindrical battery.

Background

The conventional large cylindrical battery manufacturing process uses the transfer sheet, and the transfer sheet is welded with the positive and negative electrode lugs of the winding core and the electrode column or the shell through a laser welding mode, so that equipment investment can be increased, the production efficiency is low, and the welding consistency is poor.

In order to improve the production efficiency of the cylindrical battery, there is a method of welding the tab and the connection piece at the same end, but this method reduces part of the manufacturing process, but laser welding is still adopted, and the manufacturing cost is high and there is a problem of inconsistent welding.

Accordingly, there is a need in the art for a new solution to the above-mentioned technical problems.

Disclosure of Invention

The utility model aims to solve the technical problems that welding is inconsistent and production efficiency is low due to welding of the lug and the connecting sheet when the conventional cylindrical battery is produced.

The utility model provides a cylindrical battery, which comprises a battery shell, a winding core arranged in the battery shell, a positive electrode connecting piece positioned at one end of the battery shell, and an end cover positioned at the other end of the battery shell, wherein the other end of the battery shell is provided with an opening, the end cover seals the opening, the cylindrical battery also comprises a connecting piece positioned in the battery shell, two ends of the winding core are respectively provided with a positive electrode lug and a negative electrode lug, and two ends of the connecting piece are respectively contacted with the positive electrode lug and the positive electrode connecting piece and are electrically connected with the positive electrode lug and the positive electrode connecting piece.

In the above preferred technical solution of the cylindrical battery, the connecting piece includes a tab connecting portion and an elastic connecting portion that are connected, a first end of the elastic connecting portion is connected with one end of the tab connecting portion, a second end of the elastic connecting portion extends toward the other end of the tab connecting portion, and the tab connecting portion is in abutment with the positive tab.

In the above preferred technical solution of the cylindrical battery, the elastic connection portion is provided with a first limit structure, and the positive electrode connection member is provided with a second limit structure.

In the above preferred technical solution of the cylindrical battery, one of the first limiting structure and the second limiting structure is a limiting groove, the other one of the first limiting structure and the second limiting structure is a limiting protrusion, and the limiting groove is adapted to the limiting protrusion.

In the above preferred technical solution of the cylindrical battery, the tab connection portion is provided with a plurality of connection protrusions on a side close to the positive tab, and the plurality of connection protrusions are all in abutment with the positive tab.

In the preferred technical scheme of the cylindrical battery, the connecting protrusion is semicircular, trapezoidal or triangular in shape.

In the above preferred technical solution of the cylindrical battery, the number of the elastic connection portions is plural and is set along the circumferential direction of the tab connection portion, the second ends of the plural elastic connection portions extend toward the central direction of the tab connection portion, and the end portions of the second ends of the plural elastic connection portions have a gap therebetween.

In the preferred technical solution of the cylindrical battery, the tab connection portion and the elastic connection portion are integrally provided.

In the preferable technical scheme of the cylindrical battery, the connecting sheet is made of cold-rolled stainless steel or copper-based alloy; and/or the Rockwell hardness of the connecting sheet is 40-50HRC.

In the above preferred technical solution of the cylindrical battery, the other end of the battery case is provided with an inwardly protruding rolling groove structure, the end of the winding core abuts against the rolling groove structure, and the end cover is fixed on an inner groove wall of the rolling groove structure and abuts against the negative electrode tab.

Under the condition of adopting the technical scheme, the cylindrical battery is provided with the connecting piece between the positive electrode lug and the positive electrode connecting piece, so that two ends of the connecting piece after installation are respectively contacted with the positive electrode lug and the positive electrode connecting piece, and then the positive electrode lug and the positive electrode connecting piece are electrically connected.

Further, set up the connection piece into utmost point ear connecting portion and elastic connection portion, utmost point ear connecting portion are used for being connected with anodal ear, and elastic connection portion has deformability and is connected with anodal connecting piece, and such setting method can make anodal ear and connection piece keep stable contact and keep enough big area of contact, improves joint strength, guarantees good conductive effect.

Still further, through setting up matched with first limit structure and second limit structure, can improve the connection stability of elastic connection portion and anodal connecting piece, effectively avoid elastic connection portion and the connection piece after the equipment to remove, and then guarantee connection stability.

Still further, one of the first limit structure and the second limit structure is set to be a limit protrusion, and the other limit structure is set to be a limit groove matched with the limit protrusion.

Still further, be provided with a plurality of connection protruding at utmost point ear connecting portion, make a plurality of connection protruding all support with the anodal ear and lean on, can increase the area that utmost point ear connecting portion and anodal ear contacted continually, guarantee good electric conductivity.

Still further, set up elastic connection portion into a plurality ofly, can increase the area of contact with the anodal connecting piece, improve the elastic force of connection piece simultaneously, make the connection piece after its equipment more stable, the electric conductivity is better simultaneously.

Still further, set up utmost point ear connecting portion and elastic connection portion as an organic whole structure, convenient production preparation to reduce cost improves production efficiency.

Still further, set up the slot structure at the other end of battery case, can effectually fix the core of rolling up in the battery case, improve connection stability, convenient processing improves production efficiency simultaneously.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic cross-sectional structure of a first embodiment of a cylindrical battery of the present utility model;

FIG. 2 is a schematic view of a first embodiment of a connecting tab of the present utility model;

FIG. 3 is a top view of a first embodiment of the connecting tab of the utility model;

fig. 4 is a schematic cross-sectional structure of a second embodiment of the cylindrical battery of the present utility model;

fig. 5 is a schematic structural view of a second embodiment of the connecting piece of the present utility model;

FIG. 6 is a top view of a second embodiment of the connecting tab of the utility model;

fig. 7 is a schematic cross-sectional structure of a third embodiment of the cylindrical battery of the present utility model;

FIG. 8 is a schematic view of a third embodiment of a connecting tab of the utility model;

fig. 9 is a top view of a third embodiment of the connecting tab of the utility model.

List of reference numerals：

1. A battery case; 11. a rolling groove structure;

2. a winding core; 21. a positive electrode tab; 22. a negative electrode ear;

3. a positive electrode connecting member; 31. a second limit structure;

4. an end cap;

5. a connecting sheet; 51. a tab connection part; 511. a connection protrusion; 52. an elastic connection part; 521. and the first limiting structure.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model.

It should be noted that in the description of the present utility model, 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.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through other members. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Specifically, as shown in fig. 1, the cylindrical battery of the present utility model includes a battery case 1, a winding core 2, a positive electrode connecting member 3, an end cap 4, and a connecting piece 5.

Wherein, the winding core 2 and the connecting piece 5 are located inside the battery shell 1, the positive electrode connecting piece 3 is located at one end of the battery shell 1, the other end of the battery shell 1 is provided with an opening, the end cover 4 is located at the other end of the battery shell 1 and seals the opening, the two ends of the winding core 2 are respectively provided with a positive electrode lug 21 and a negative electrode lug 22, the two ends of the connecting piece 5 are respectively contacted with the positive electrode lug 21 and the positive electrode connecting piece 3, and the connecting piece 5 is electrically connected with the positive electrode lug 21 and the positive electrode connecting piece 3.

In the cylindrical battery of the utility model, the connecting piece 5 is arranged between the positive electrode connecting piece 3 and the positive electrode lug 21, and after the installation is completed, the two ends of the connecting piece 5 are respectively abutted against the positive electrode lug 21 and the positive electrode connecting piece 3, so that the positive electrode lug 21 and the positive electrode connecting piece 3 are electrically connected through the connecting piece 5. The arrangement mode does not need to weld the positive electrode lug 21, the connecting sheet 5 and the positive electrode connecting piece 3, and only needs to enable the positive electrode connecting piece 3, the connecting sheet 5 and the positive electrode lug 21 to be sequentially abutted and fixed, so that the assembly is convenient, the production efficiency is improved, the welding procedure is reduced, and the problem of inconsistent welding is avoided.

When the cylindrical battery is assembled, the connecting piece 5 is firstly put into the battery shell 1, then the winding core 2 is put into the battery shell, the positive electrode lug 21 of the winding core 2 is abutted against one end of the connecting piece 5, the winding core 2 is pressed, the other end of the connecting piece 5 is abutted against the positive electrode connecting piece 3, the positive electrode lug 21 and the positive electrode connecting piece 3 are electrically connected through the connecting piece 5, the winding core 2 is pressed, the end cover 4 is fixedly arranged at the other end of the battery shell 1, the end cover 4 is abutted against the negative electrode lug 22, and the other end of the battery shell 1 is sealed by the end cover 4, so that the winding core 2 is fixed in the battery shell 1, and the whole cylindrical battery is assembled.

It should be noted that, the specific material of the connecting piece 5 is not limited in the present utility model, and the positive electrode tab 21 and the positive electrode connecting piece 3 can be electrically connected, and in practical application, a person skilled in the art can select the material required by the connecting piece 5 according to the actual needs.

Preferably, the material of the connecting piece 5 is cold-rolled stainless steel or copper-based alloy.

The connecting sheet 5 is prepared by adopting cold-rolled stainless steel or copper-based alloy, so that the connecting sheet has good elasticity and can maintain good electric conductivity.

Preferably, the Rockwell hardness of the connecting piece 5 is 40-50HRC.

The rockwell hardness of the connecting piece 5 is between 40 and 50HRC, and the elasticity, strength and toughness of the connecting piece are moderate, so that the connecting piece 5 can be ensured to be stable after being abutted against the positive electrode lug 21 and the positive electrode connecting piece 3.

It should be noted that, the specific structure of the connection piece 5 is not limited in the present utility model, as long as the connection piece 5 can electrically connect the positive electrode tab 21 and the positive electrode connector 3 after the installation is completed, and can be kept stable, and in practical application, a person skilled in the art can set the specific structure of the connection piece 5 according to the actual needs.

Preferably, as shown in fig. 2 and 3, the connection piece 5 includes a tab connection portion 51 and an elastic connection portion 52 that are connected, a first end of the elastic connection portion 52 is connected to one end of the tab connection portion 51, a second end of the elastic connection portion 52 extends toward the other end of the tab connection portion 51, and the tab connection portion 51 abuts against the positive electrode tab 21.

The connecting piece 5 is provided with the tab connecting part 51 and the elastic connecting part 52, so that the tab connecting part 51 and the elastic connecting part 52 are respectively connected with the positive electrode tab 21 and the positive electrode connecting piece 3, and after the installation is completed, the elastic connecting part 52 can deform towards the direction of the tab connecting part 51, so that the elastic connecting part 52 and the tab connecting part 51 are stressed back to each other under the action of rebound force, the elastic connecting part 52 is tightly abutted with the positive electrode connecting piece 3, and the tab connecting part 51 is tightly abutted with the positive electrode tab 21. The arrangement mode is simple in structure and high in connection strength, and can keep the connecting sheet 5 in continuous contact with the positive electrode lug 21 and the positive electrode connecting piece 3, so that good conductive effect is guaranteed.

It should be noted that, the specific connection manner of the tab connection portion 51 and the elastic connection portion 52 is not limited in the present utility model, so long as the connected elastic connection portion 52 can deform and generate elastic force towards the tab connection portion 51 after being stressed, and in practical application, a person skilled in the art can set the specific connection manner of the tab connection portion 51 and the elastic connection portion 52 according to actual needs. For example, one end of the elastic connection portion 52 may be welded to one end of the tab connection portion 51, or the elastic connection portion 52 may be integrally provided with the tab connection portion 51. Such adjustment and modification of the specific connection manner of the tab connection portion 51 and the elastic connection portion 52 do not deviate from the principle of the present utility model, and should be limited within the protection scope of the present utility model.

Preferably, as shown in fig. 5 and 8, the tab connection portion 51 is integrally provided with the elastic connection portion 52.

The tab connection part 51 and the elastic connection part 52 are arranged into an integral structure, so that the production and the preparation are convenient, and the cost is low.

In practical application, the tab connection portion 51 may be a disc-shaped connection piece, and the elastic connection portion 52 may be a strip-shaped connection piece; alternatively, the tab connection portion 51 may be provided as a square connection piece, the elastic connection portion 52 may be provided as a connection rib, or the like. Such specific structural adjustments and changes of the tab connection portion 51 and the elastic connection portion 52 do not deviate from the principle of the present utility model, and should be limited to the protection scope of the present utility model.

It should be noted that the specific number of the elastic connection portions 52 is not limited in the present utility model, and in practical applications, a person skilled in the art may set the specific number of the elastic connection portions 52 according to actual needs. For example, the elastic connection portion 52 is provided in one, two or more. These specific number of adjustments and changes of the elastic connection portion 52 do not deviate from the principle of the present utility model, and should be limited to the protection scope of the present utility model.

Preferably, the number of the elastic connection parts 52 is plural, the plurality of elastic connection parts 52 are circumferentially arranged along the tab connection part 51, the second ends of the plurality of elastic connection parts 52 extend toward the center direction of the tab connection part 51, and the ends of the second ends of the plurality of elastic connection parts 52 have a gap therebetween.

The elastic connection parts 52 are arranged in a plurality, and are arranged along the circumferential direction of the tab connection parts 51, after the elastic connection parts 52 are abutted against the positive electrode connection pieces 3, the rebound force of the elastic connection parts 52 can be uniformly distributed, and then each position of the tab connection parts 51 is contacted with the corresponding region of the positive electrode tab 21, meanwhile, the contact area between the elastic connection parts 52 and the positive electrode connection pieces 3 can be increased, the electric conductivity is improved, and in addition, the end parts of the second ends of the elastic connection parts 52 are provided with gaps, so that the adjacent two elastic connection parts 52 are not contacted with each other, the elastic connection parts 52 are not affected, and the use is convenient.

Preferably, as shown in fig. 1 and 2, the elastic connection portion 52 is provided with a first limiting structure 521, and the positive electrode connection member 3 is provided with a second limiting structure 31. The first limiting structure 521 is matched with the second limiting structure 31 to prevent the elastic connection portion 52 from moving relative to the positive electrode connecting member 3 in the radial direction.

The elastic connecting part 52 is provided with the first limiting structure 521, the positive electrode connecting piece 3 is provided with the second limiting structure 31, the elastic connecting part 52 can be prevented from moving relative to the positive electrode connecting piece 3 along the radial direction after the first limiting structure 521 is matched with the second limiting structure 31, and the abutting position of the elastic connecting part 52 and the positive electrode connecting piece 3 can be limited and fixed by the arrangement mode, so that the movement of the elastic connecting part 52 is limited, and the connecting piece 5 can be tightly abutted against the positive electrode lug 21 and the negative electrode lug 22, so that good electric conduction capacity is ensured.

It should be noted that, the specific shapes of the first limiting structure 521 and the second limiting structure 31 are not limited in the present utility model, as long as the first limiting structure 521 and the second limiting structure 31 can be mutually limited and do not move after being matched, and in practical application, a person skilled in the art can set the specific shapes of the first limiting structure 521 and the second limiting structure 31 according to actual needs.

Preferably, one of the first limiting structure 521 and the second limiting structure 31 is a limiting groove, and the other one of the first limiting structure 521 and the second limiting structure 31 is a limiting protrusion, and the limiting groove is matched with the limiting protrusion.

The first limiting structure 521 and the second limiting structure 31 are respectively arranged as a limiting groove and a limiting protrusion which are matched, so that the structure is simple, and the assembly and the use are convenient.

In addition, it should be noted that the specific shape of the limiting protrusion is not limited in the present utility model, and in practical application, a person skilled in the art can set the specific shape of the limiting protrusion according to the actual needs. For example, the limit projection is provided in a semicircular shape, or alternatively, the limit projection is provided in a circular shape, or the like. Such modifications and changes in the specific shape of the limiting projection do not depart from the basic principle of the present utility model and should be limited to the scope of the present utility model.

Preferably, as shown in fig. 2, the tab connection part 51 is provided with a plurality of connection protrusions 511 at a side close to the positive tab 21, and the plurality of connection protrusions 511 are abutted against the positive tab 21.

The plurality of connection protrusions 511 are provided for abutting against the positive electrode tab 21, so that the contact area between the tab connection portion 51 and the positive electrode tab 21 can be increased, and the contact tightness can be improved, so that the tab connection portion 51 and the positive electrode tab 21 are kept in abutting contact at any time, and stable conductivity of the cylindrical battery is ensured.

Preferably, the connection protrusion 511 has a semicircular shape, a trapezoid shape, or a triangle shape.

The connecting protrusion 511 is provided with a semicircular shape, a trapezoid shape or a triangle shape, is simple in structure and convenient to manufacture, and can increase the contact area between the tab connecting portion 51 and the positive tab 21, so that good conductivity is ensured, and the use is convenient.

Preferably, as shown in fig. 1, the other end of the battery case 1 is provided with an inwardly protruding rolling groove structure 11, the end of the winding core 2 abuts against the rolling groove structure 11, and the end cap 4 is fixed to the inner groove wall of the rolling groove structure 11 and abuts against the negative electrode tab 22.

The other end of the battery shell 1 is provided with a rolling groove structure 11 which protrudes outwards by adopting a rolling groove process, so that the end part of the winding core 2 is abutted against the rolling groove structure 11, thereby fixing the winding core 2 inside the battery shell 1, fixedly mounting the end cover 4 on the inner groove wall of the rolling groove structure 11, sealing an opening at the other end of the battery shell 1, and abutting the end cover 4 with the negative electrode lug 22 to ensure electric connection; by adopting the arrangement mode, the end cover 4 and the battery shell 1 are sealed by the rolling groove structure 11, so that the winding core 2 can be ensured to be kept stable in the battery shell 1, the production difficulty is reduced, and the processing and the preparation are convenient.

The specific structure of the cylindrical battery of the present utility model will be described in detail with reference to three specific embodiments.

Example 1

As shown in fig. 1 to 3, the cylindrical battery of the present embodiment includes a battery case 1, a winding core 2 and a connecting piece 5 provided in the battery case 1, a positive electrode connecting piece 3 located at one end of the battery case 1, and an end cap 4 located at the other end of the battery case 1, the other end of the battery case 1 has an opening, the end cap 4 seals the opening, both ends of the winding core 2 have a positive electrode tab 21 and a negative electrode tab 22, respectively, both ends of the connecting piece 5 are in contact with the positive electrode tab 21 and the positive electrode connecting piece 3, respectively, and the connecting piece 5 is electrically connected with the positive electrode tab 21 and the positive electrode connecting piece 3.

The connection piece 5 includes a tab connection portion 51 and an elastic connection portion 52, where the tab connection portion 51 and the elastic connection portion 52 are connected, only one elastic connection portion 52 is provided, a first end of the elastic connection portion 52 is welded and fixed with one end of the tab connection portion 51, a second end of the elastic connection portion 52 extends toward the other end of the tab connection portion 51, and the tab connection portion 51 abuts against the positive electrode tab 21.

The second end of the elastic connecting portion 52 is provided with a first limiting structure 521, the first limiting structure 521 is a limiting protrusion, the positive electrode connecting piece 3 is provided with a second limiting structure 31, the second limiting structure 31 is a limiting groove, and the limiting protrusion is located in the limiting groove, so that the elastic connecting portion 52 and the connecting piece 5 are limited to move relative to the positive electrode connecting piece 3 along the radial direction.

The tab connection portion 51 is a disk-shaped connection piece, and a plurality of semicircular connection protrusions 511 are provided on one side close to the positive electrode tab 21, and the plurality of connection protrusions 511 are all abutted against the positive electrode tab 21.

The other end of the battery case 1 is provided with an inwardly protruding rolling groove structure 11, the end of the winding core 2 abuts against the rolling groove structure 11, and the end cover 4 is fixed on the inner groove wall of the rolling groove structure 11 and abuts against the negative electrode lug 22.

The connecting sheet 5 is made of cold-rolled stainless steel, and the Rockwell hardness of the connecting sheet 5 is 40-50HRC.

The assembly flow of the cylindrical battery of this embodiment is as follows:

firstly, the connecting sheet 5 is put into the battery shell 1, and the limiting protrusion on the elastic connecting part 52 is positioned in the limiting groove of the positive electrode connecting piece 3, so that the elastic connecting part 52 is abutted against the positive electrode connecting piece 3, and the connecting sheet 5 is limited.

Then, the winding core 2 is put in, the positive tab 21 of the winding core 2 is abutted against the connection protrusion 511 of the tab connection part 51, the winding core 2 is pressed, the elastic connection part 52 is deformed towards the tab connection part 51, and the connection piece 5 is tightly abutted against the positive tab 21 and the positive connection piece 3.

Then the other end of the battery shell 1 is grooved to obtain an inwardly protruding groove rolling structure 11, and the end of the winding core 2 close to the other end of the battery shell 1 is abutted against the groove rolling structure 11, so that the winding core 2 is fixed in the battery shell 1.

Finally, the end cover 4 is fixedly arranged on the inner groove wall of the rolling groove structure 11 and is abutted against the negative electrode lug 22, so that the whole cylindrical battery is assembled.

Example 2

As shown in fig. 4 to 6, the cylindrical battery of the present embodiment includes a battery case 1, a winding core 2 and a connecting piece 5 provided in the battery case 1, a positive electrode connecting piece 3 located at one end of the battery case 1, and an end cap 4 located at the other end of the battery case 1, the other end of the battery case 1 has an opening, the end cap 4 seals the opening, both ends of the winding core 2 have a positive electrode tab 21 and a negative electrode tab 22, respectively, both ends of the connecting piece 5 are in contact with the positive electrode tab 21 and the positive electrode connecting piece 3, respectively, and the connecting piece 5 is electrically connected with the positive electrode tab 21 and the positive electrode connecting piece 3.

The connection piece 5 includes an integrally disposed tab connection portion 51 and an elastic connection portion 52, where the elastic connection portion 52 is only provided with one tab connection portion, a first end of the elastic connection portion 52 is integrally formed with one end of the tab connection portion 51, and a second end of the elastic connection portion 52 extends toward the other end of the tab connection portion 51, and the tab connection portion 51 abuts against the positive electrode tab 21.

The second end of the elastic connecting portion 52 is provided with a first limiting structure 521, the first limiting structure 521 is a limiting groove, the positive electrode connecting piece 3 is provided with a second limiting structure 31, the second limiting structure 31 is a limiting protrusion, and the limiting protrusion is located in the limiting groove, so that the elastic connecting portion 52 and the connecting piece 5 are limited to move relative to the positive electrode connecting piece 3 along the radial direction.

The tab connection portion 51 is a disk-shaped connection piece, and a plurality of triangular connection protrusions 511 are provided on one side close to the positive electrode tab 21, and the plurality of connection protrusions 511 are all abutted against the positive electrode tab 21.

The assembly flow of the cylindrical battery of this embodiment is as follows:

firstly, the connecting piece 5 is put into the battery shell 1, and meanwhile, the limiting bulge of the positive electrode connecting piece 3 is positioned in the limiting groove on the elastic connecting part 52, so that the elastic connecting part 52 abuts against the positive electrode connecting piece 3, and the connecting piece 5 is limited.

Example 3

As shown in fig. 7 to 9, the cylindrical battery of the present embodiment includes a battery case 1, a winding core 2 and a connecting piece 5 provided in the battery case 1, a positive electrode connecting piece 3 located at one end of the battery case 1, and an end cap 4 located at the other end of the battery case 1, the other end of the battery case 1 has an opening, the end cap 4 seals the opening, both ends of the winding core 2 have a positive electrode tab 21 and a negative electrode tab 22, respectively, both ends of the connecting piece 5 are in contact with the positive electrode tab 21 and the positive electrode connecting piece 3, respectively, and the connecting piece 5 is electrically connected with the positive electrode tab 21 and the positive electrode connecting piece 3.

The connection piece 5 includes an integrally disposed tab connection portion 51 and an elastic connection portion 52, the elastic connection portion 52 is provided with two elastic connection portions 52, the two elastic connection portions 52 are uniformly disposed along the circumferential direction of the tab connection portion 51, first ends of the two elastic connection portions 52 are integrally formed with one end of the tab connection portion 51, second ends of the two elastic connection portions 52 extend towards the center direction of the tab connection portion 51, and a gap is formed between ends of the second ends of the two elastic connection portions 52, and the tab connection portion 51 is abutted against the positive electrode tab 21.

The tab connection portion 51 is a disk-shaped connection piece, and a plurality of trapezoidal connection protrusions 511 are provided on one side close to the positive electrode tab 21, and the plurality of connection protrusions 511 are all abutted against the positive electrode tab 21.

The connecting sheet 5 is made of copper base alloy, and the Rockwell hardness of the connecting sheet 5 is 40-50HRC.

The assembly flow of the cylindrical battery of this embodiment is as follows:

firstly, the connecting sheet 5 is put into the battery shell 1, and the limiting protrusion of the elastic connecting part 52 is positioned in the limiting groove of the positive electrode connecting piece 3, so that the elastic connecting part 52 is abutted against the positive electrode connecting piece 3, and the connecting sheet 5 is limited.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims

1. The cylindrical battery is characterized by comprising a battery shell, a winding core arranged in the battery shell, a positive electrode connecting piece positioned at one end of the battery shell and an end cover positioned at the other end of the battery shell, wherein the other end of the battery shell is provided with an opening and the end cover is sealed with the opening, the cylindrical battery also comprises a connecting sheet positioned in the battery shell, two ends of the winding core are respectively provided with a positive electrode lug and a negative electrode lug, and two ends of the connecting sheet are respectively contacted with the positive electrode lug and the positive electrode connecting piece and are electrically connected with the positive electrode lug and the positive electrode connecting piece.

2. The cylindrical battery according to claim 1, wherein the connection piece includes a tab connection portion and an elastic connection portion that are connected, a first end of the elastic connection portion is connected to one end of the tab connection portion, a second end of the elastic connection portion extends toward the other end of the tab connection portion, and the tab connection portion is abutted to the positive electrode tab.

3. The cylindrical battery according to claim 2, wherein the elastic connection part is provided with a first limit structure, and the positive electrode connection member is provided with a second limit structure.

4. The cylindrical battery of claim 3, wherein one of the first and second limiting structures is a limiting groove, the other of the first and second limiting structures is a limiting protrusion, and the limiting groove is adapted to the limiting protrusion.

5. The cylindrical battery according to claim 2, wherein the tab connection portion is provided with a plurality of connection protrusions on a side close to the positive tab, the plurality of connection protrusions being abutted against the positive tab.

6. The cylindrical battery according to claim 5, wherein the connection protrusion has a semicircular shape, a trapezoidal shape, or a triangular shape.

7. The cylindrical battery according to claim 2, wherein the number of the elastic connection portions is plural and is arranged circumferentially along the tab connection portion, the second ends of the plural elastic connection portions each extend toward the center direction of the tab connection portion, and the end portions of the second ends of the plural elastic connection portions have a gap therebetween.

8. The cylindrical battery according to claim 2, wherein the tab connection portion is integrally provided with the elastic connection portion.

9. The cylindrical battery according to claim 1, wherein the connecting piece is made of cold-rolled stainless steel or copper-based alloy; and/or

The Rockwell hardness of the connecting sheet is 40-50HRC.

10. The cylindrical battery according to any one of claims 1 to 9, wherein the other end of the battery case is provided with an inwardly protruding rolling groove structure against which the end of the winding core abuts, and the end cap is fixed on an inner groove wall of the rolling groove structure and abuts against the negative electrode tab.