CN210379217U

CN210379217U - Cylindrical battery and battery cap thereof

Info

Publication number: CN210379217U
Application number: CN201920939550.8U
Authority: CN
Inventors: 娄豫皖; 许玉林; 王爱淑; 甘凯歌; 张朋; 张瑞; 毕玉萍
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-21
Anticipated expiration: 2029-06-21

Abstract

The application discloses cylindrical battery and battery block thereof, battery block includes: the anti-explosion device comprises an end cover, an anti-explosion sheet, a lantern ring and a current collecting disc, wherein the end cover is provided with an explosion release hole in a run-through mode, the anti-explosion sheet is attached to the inner side of the end cover, the lantern ring is attached to the inner side of the anti-explosion sheet, and the current collecting disc is located on the inner side of the anti-; the end cover, the explosion-proof piece, the sleeve ring and the current collecting plate are made of metal materials, the current collecting plate comprises a plate body and a circle of annular flange which is integrally connected to the outer edge of the plate body and protrudes outwards, and the annular flange is attached to and inserted into the sleeve ring and is fixedly welded with the sleeve ring. The battery has the advantages of simple structure, easy manufacture, small internal resistance and explosion-proof function.

Description

Cylindrical battery and battery cap thereof

Technical Field

The application relates to a cylindrical battery and a battery cover cap thereof.

Background

With the development of society and the shortage of energy, the development and storage technology of green energy becomes a problem which needs to be solved urgently. Lithium ion batteries have been the focus of attention due to their advantages of high energy density, high power density, long cycle life, no memory effect, etc., and have also become the direction of battery development for electric vehicles.

The power of the electric automobile is partially or completely provided by the battery, so the battery required to be used has certain power characteristics, and the electrode lugs on the battery are taken as leading-out ends of the anode and the cathode and are connected with the battery shell or directly led out to play a role in conducting current between the outside and the electrodes. The existing tabs mostly adopt thickened and widened tabs or use a multi-tab structure, and the thickened and widened tabs can make the welding of the tabs and positive and negative electrode carriers or the welding of the tabs and battery caps difficult and difficult to ensure the welding consistency; the multi-lug structure increases the diameter of the battery when the pole group is wound, reduces the contact area of the positive pole piece and the negative pole piece, makes the welding of a plurality of lugs and a battery cap more difficult, integrates the lugs into one beam after welding, makes the lugs hard by the welding heat, makes the gland difficult, also damages the pole group during the gland, and can cause the contact internal resistance between the positive and negative pole carriers and the battery cap or between the battery shell to increase, the power performance is reduced, and the long service life requirement of the whole vehicle can not be met.

In view of the above, a full tab battery has been proposed in which tabs at the end portions of an inner core of the battery are flattened, and current collecting plates are welded to the positive and negative end surfaces of the inner core of the full tab battery, and the positive and negative ends of the inner core are led out to electrode terminals outside the battery by the current collecting plates. However, in the conventional all-tab battery, if an explosion-proof structure is arranged on the battery end cover, the flow area between the current collecting disc and the electrode terminal is small, and the internal resistance of the battery is increased.

Disclosure of Invention

The purpose of the application is: in order to solve the problems, the cylindrical battery and the battery cap thereof are provided, and the battery is simple in structure, easy to manufacture, small in internal resistance and explosion-proof.

The technical scheme of the application is as follows:

a battery cap, comprising:

an end cover which is provided with a explosion venting hole in a run-through way,

an explosion-proof sheet attached to the inner side of the end cover,

a collar attached to the inner side of the rupture disk, and

the flow collecting disc is positioned on the inner side of the explosion-proof sheet;

the end cover, the explosion-proof piece, the sleeve ring and the current collecting plate are made of metal materials, the current collecting plate comprises a plate body and a circle of annular flange which is integrally connected to the outer edge of the plate body and protrudes outwards, and the annular flange is attached to and inserted into the sleeve ring and is fixedly welded with the sleeve ring.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the end cover, the explosion-proof sheet, the lantern ring and the flow collecting disc are all made of aluminum.

The annular flange and the lantern ring are fixed in a laser welding mode.

And the explosion-proof sheet is fixed with the end cover by laser welding.

And the lantern ring and the explosion-proof sheet are fixed by laser welding.

The axial cross-section of the lantern ring is L-shaped, and the lantern ring is composed of a horizontal ring body and a vertical ring body which are vertically arranged and connected into a whole, wherein the horizontal ring body is attached to the explosion-proof sheet for welding, and the vertical ring body is attached to the annular flange for welding.

The middle part of the end cover is integrally stamped with a bulge protruding outwards, and the explosion venting hole is formed in the bulge.

The explosion venting holes are arranged in at least three numbers, and the explosion venting holes are uniformly arranged at intervals along the circumferential direction.

A cylindrical battery comprising:

a cylindrical battery case having at least one end open,

an inner core housed in the battery case, and

the battery cap is arranged at an opening at one end of the battery shell;

the outer edge of the end cover is hermetically fixed with the opening of the battery shell, and the explosion-proof sheet hermetically isolates the explosion venting hole from the inner cavity of the battery shell.

The outer edge of the end cover is abutted against the opening part of the battery shell and is welded and fixed.

The application has the advantages that:

according to the battery cap, the end cover is provided with the explosion venting hole, the explosion-proof piece and the lantern ring are additionally arranged on the inner side of the end cover, the outer edge of the current collecting disc is provided with the annular flange, the annular flange of the current collecting disc is attached to and inserted into the lantern ring and is welded and fixed, the current guide area of the current collecting disc and the electrode terminal (end cover) is increased, the internal resistance of a battery is reduced, and the battery cap has the explosion-proof pressure venting function.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a cylindrical battery in an embodiment of the present application;

wherein: 1-end cover, 1 a-explosion venting hole, 1 b-bulge, 2-explosion-proof sheet, 3-lantern ring, 4-current collecting disc, 4 a-disc body, 4 b-annular flange and 5-battery shell.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 shows a preferred embodiment of the cylindrical battery of the present application, which, like some conventional cylindrical batteries, also includes a cylindrical battery case 5 and an inner core (not shown) accommodated in the battery case, both axial ends of the battery case 5 are open structures, and a battery cap is fixedly disposed at the opening of each end, only the battery cap at the upper end is shown in fig. 1, and the battery cap at the lower end is removed.

The key improvement of this embodiment lies in that the battery cap at the upper end of the battery in fig. 1 includes an end cover 1, an explosion-proof sheet 2, a collar 3 and a current collecting plate 4, and the end cover 1, the explosion-proof sheet 2, the collar 3 and the current collecting plate 4 are all made of metal conductive materials, specifically, aluminum. Wherein:

a plurality of explosion venting holes 1a are formed in the end cover 1 in a penetrating mode, the outer edge of the end cover 1 is abutted to the opening portion of the battery shell 5 and is welded and fixed, and the joint of the outer edge of the end cover 1 and the opening portion of the battery shell 5 is sealed and airtight. The explosion-proof sheet 2 is arranged at the inner side of the end cover 1 in a clinging manner and fixed by laser welding, the explosion-proof sheet 2 seals and isolates the explosion venting hole 1a from the inner cavity of the battery shell 5, so that electrolyte in the battery is prevented from leaking from the explosion venting hole in normal use, and the explosion venting hole is communicated with the inner cavity of the battery shell to vent internal high pressure only after the explosion-proof sheet 2 is broken due to overlarge air pressure in the battery. The collar 3 is arranged against the inside of the rupture disk 2 and is fixed by laser welding. The current collecting disc 4 is arranged on the inner side of the explosion-proof sheet 2, the current collecting disc 4 comprises a disc body 4a, a circle of annular flange 4b protruding outwards is integrally connected to the outer edge of the disc body 4a, the disc body 4a is arranged in a manner of being attached to the positive end face (or the negative end face) of the inner core and is fixed in a welding mode, the annular flange 4b is inserted in the lantern ring 3 in a manner of being attached to the positive end face (or the negative end face) of the inner core, and the annular flange 4b is fixed with.

For the convenience above-mentioned lantern ring 3 and explosion-proof piece 2 paste and lean on the welding, increase the area of overflowing of lantern ring 3 and explosion-proof piece 2 simultaneously, this embodiment sets up the axial cross-section of lantern ring 3 into L type structure, and it comprises the horizontal ring body and the vertical ring body that arrange perpendicularly and link as an organic whole, and wherein the horizontal ring body pastes with explosion-proof piece 2 and pastes the welding, and the vertical ring body pastes with the annular flange 4b of current collector and pastes the welding.

In the present embodiment, a circular protrusion 1b protruding outward is integrally punched in the middle of the end cap 1, all the explosion venting holes 1a are opened in the protrusion 1b, and the explosion venting holes 1a are uniformly spaced in the circumferential direction. The protrusion 1b is equivalent to a pole of the battery, so that the electric energy of the battery can be conveniently led out.

In the present application, unless otherwise specified, "inner" and "outer" refer to the side close to the cavity of the battery case as "inner" and the side far from the cavity of the battery case as "outer".

It should be noted that, in some cylindrical batteries, the battery case is opened at one end and closed at the other end, and in this case, the battery is provided with only one battery cap, and the battery cap may also adopt the structural form of the battery cap of the present embodiment, but in order to prevent short circuit, it is preferable to mechanically press and fix (non-welding) the end cap 1 and the opening of the battery case, and to interpose an insulating seal ring therebetween.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A battery cap, comprising:

an end cover (1) which is provided with a explosion venting hole (1a) in a run-through way,

an explosion-proof sheet (2) which is attached and fixed on the inner side of the end cover (1),

a collar (3) which is attached to the inner side of the rupture disk (2), and

the current collecting disc (4) is positioned on the inner side of the explosion-proof sheet (2);

end cover (1), explosion-proof piece (2), the lantern ring (3) and current collection dish (4) are the metal material, current collection dish (4) include disk body (4a) and integrated connection in disk body (4a) outer fringe department and outside convex round annular flange (4b), annular flange (4b) paste to lean on insert locate in the lantern ring (3) and with lantern ring (3) welded fastening.

2. The battery cap according to claim 1, characterized in that the end cap (1), the rupture disc (2), the collar (3) and the current collecting tray (4) are all of aluminum.

3. The battery cap according to claim 1, characterized in that the annular flange (4b) is laser welded fixed to the collar (3).

4. The battery cap according to claim 1, wherein the explosion-proof sheet (2) is fixed to the end cap (1) by laser welding.

5. The battery cap according to claim 1, characterized in that the collar (3) is laser welded to the rupture disc (2).

6. The battery cap according to claim 5, wherein the axial section of the collar (3) is L-shaped, and the collar is composed of a horizontal ring body and a vertical ring body which are vertically arranged and integrally connected, wherein the horizontal ring body is welded with the explosion-proof sheet in an abutting manner, and the vertical ring body is welded with the annular flange in an abutting manner.

7. The battery cap according to claim 1, wherein a protrusion (1b) protruding outwards is integrally punched in the middle of the end cap (1), and the explosion venting hole (1a) is opened in the protrusion (1 b).

8. The battery cap according to claim 7, wherein the explosion venting holes (1a) are provided in at least three, and the explosion venting holes (1a) are arranged at regular intervals in the circumferential direction.

9. A cylindrical battery comprising:

a cylindrical battery case (5) having at least one open end,

an inner core housed in the battery case (5), and

the battery cap is arranged at an opening at one end of the battery shell (5);

the battery cap is characterized in that the battery cap is the battery cap as claimed in any one of claims 1 to 8, the outer edge of the end cap (1) is hermetically fixed with the opening part of the battery shell (5), the explosion-proof sheet (2) hermetically isolates the explosion venting hole (1a) from the inner cavity of the battery shell (5), and the current collecting disc (4) is welded and fixed with the inner core.

10. The cylindrical battery according to claim 9, wherein the outer edge of the end cap (1) is placed against the open portion of the battery case (5) and is welded.