CN220934339U - Cylindrical battery - Google Patents

Abstract

The utility model provides a cylindrical battery, and belongs to the technical field of batteries. Comprises a shell; the battery cell is arranged in the shell and is provided with positive electrode lugs and negative electrode lugs which are arranged at intervals, the positive electrode lugs and the negative electrode lugs are positioned on the end face of the same side of the battery cell, and the positive electrode lugs and the negative electrode lugs are positioned at the same height; the cover plate assembly is arranged at one end of the positive electrode lug and one end of the negative electrode lug and is used for sealing the battery cell in the shell, and comprises a first leading-out piece, a second leading-out piece and a first insulating piece, wherein the first insulating piece is used for enabling the first leading-out piece and the second leading-out piece to be spaced apart, the first leading-out piece is connected with the positive electrode lug to output a positive electrode, and the second leading-out piece is connected with the negative electrode lug to output a negative electrode. The utility model solves the problems of small space for electric connection of the anode and the cathode of the battery and large resistance between the anode and the cathode caused by the fact that the electrodes of the cylindrical battery are distributed on two sides in the prior art.

Description

Cylindrical battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a cylindrical battery.

Background

The cylindrical battery has the characteristics of high safety, high single-body energy density, high production efficiency and the like, and has wide application prospect in the field of power batteries.

Most of current cylindrical batteries are provided with positive and negative electrode opposite-side electrode outlet lugs: 1, the flow guiding path between the positive electrode and the negative electrode passes through the section of the whole shell in the height direction, and the shell has higher resistance and further higher internal resistance of the battery cell because the shell has higher height and thinner wall thickness. 2, the positive electrode and the negative electrode are provided with electrode lugs at different sides, and the positive electrode and the negative electrode are respectively required to be reserved with an electric connection space, so that the height design of the pole piece is limited, and the capacity and the energy density of the battery cell are influenced; 3, the positive electrode and the negative electrode are provided with electrode lugs on different sides, the negative electrode current collecting disc is required to be independently arranged and welded with the shell during battery production, and the manufacturing process efficiency is low.

Disclosure of utility model

An object of the present utility model is to provide a cylindrical battery to solve the problems of small space for electrically connecting the positive and negative electrodes of the battery and large resistance between the positive and negative electrodes caused by the distribution of the electrodes on both sides of the cylindrical battery in the prior art.

In particular, the present utility model provides a cylindrical battery comprising:

a housing;

The battery cell is arranged in the shell and is provided with positive electrode lugs and negative electrode lugs which are arranged at intervals, the positive electrode lugs and the negative electrode lugs are positioned on the end face of the same side of the battery cell, and the positive electrode lugs and the negative electrode lugs are positioned at the same height;

The cover plate assembly is arranged at one end of the positive electrode lug and one end of the negative electrode lug and is used for sealing the battery cell in the shell, and comprises a first leading-out piece, a second leading-out piece and a first insulating piece, wherein the first insulating piece is used for enabling the first leading-out piece and the second leading-out piece to be spaced apart, the first leading-out piece is connected with the positive electrode lug to output a positive electrode, and the second leading-out piece is connected with the negative electrode lug to output a negative electrode.

Further, the method further comprises the following steps:

One side of the positive electrode current collecting disc is electrically connected with the positive electrode lug, and the other side of the positive electrode current collecting disc is electrically connected with the first leading-out piece;

A second insulating member partially covering one side of the positive electrode current collecting plate electrically connected to the first lead-out member to insulate the positive electrode current collecting plate from the second lead-out member when electrically connected to the first lead-out member

Further, the second drawing member includes:

The cover plate body is provided with a through hole in the center, and the first leading-out piece passes through the through hole and protrudes out of the cover plate body;

And one end of the negative electrode current collecting disc is electrically connected with the negative electrode lug, and the other end of the negative electrode current collecting disc is electrically connected with the cover plate body.

Further, the first drawing member includes:

The connecting piece is arranged outside the cover plate body;

and one end of the pole column is electrically connected with the positive current collecting disc, and the other end of the pole column penetrates through the through hole to be electrically connected with the connecting piece.

Further, the first insulating member includes:

The upper plastic is provided with a groove body for accommodating the connecting piece, and the bottom of the groove body is provided with a mounting hole;

And the lower plastic is positioned between the polar post and the inner side surface of the cover plate body and is positioned on the upper surface of the lower connecting part of the polar post so as to insulate the upper surface of the polar post from the lower surface of the cover plate body.

Further, the method further comprises the following steps:

And the sealing ring is sleeved on the outer side of the pole, so as to seal the gap between the cover plate body and the pole.

Further, the negative electrode current collecting plate comprises a body part and a bending part, wherein the bending part is connected with the body part and is folded over the body part, and a gap is reserved between the bending part and the body part.

Further, the lower plastic is provided with an opening, and the shape of the opening is matched with the shape of the bending part, so that the bending part is electrically connected with the cover plate body.

Further, the positive electrode current collecting disc and the positive electrode lug are provided with a first connecting portion, the negative electrode current collecting disc and the negative electrode lug are provided with a second connecting portion, and the first connecting portion and the second connecting portion are located at the same height.

Further, the method further comprises the following steps:

The priming hole plug is arranged at the bottom of the shell;

and the hole cover is connected with the shell to cover the liquid injection hole.

According to the utility model, the positive and negative lugs of the battery cell are led out from the same side, so that the positive and negative electric connection spaces are shared, and the height of the pole piece is increased, and the capacity of the battery cell is increased; the negative electrode is connected with the current collecting disc and is integrated on the cover plate assembly, so that a flow guide path between the positive electrode and the negative electrode is greatly shortened without passing through the battery cell shell, the internal resistance of the battery cell is reduced, and in addition, the negative electrode current collecting disc is not required to be welded with the shell in the battery cell manufacturing process, and the manufacturing efficiency of the battery cell is greatly improved.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

fig. 1 is an exploded view of a cylindrical battery according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the cylindrical battery shown in FIG. 1;

FIG. 3 is a schematic enlarged partial view of the cover plate assembly shown in FIG. 2;

FIG. 4 is an exploded view of a coverplate assembly according to one embodiment of the present utility model;

FIG. 5 is a cross-sectional view of the cover plate assembly of FIG. 4;

In the figure: 1. a housing; 10. a priming orifice plug; 11. a hole cover; 2. a battery cell; 20. a positive electrode tab; 200. a first connection portion; 21. a negative electrode ear; 210. a second connecting portion; 3. a cover plate assembly; 30. a first drawing member; 300. a connecting piece; 301. a pole; 31. a second drawing member; 310. a cover plate body; 3100. a through hole; 311. a negative electrode current collecting plate; 3110. a body portion; 3111. a bending part; 32. a first insulating member; 320. applying plastic; 3200. a tank body; 3201. a mounting hole; 321. lower plastic; 3210. an opening; 322. a seal ring; 4. a positive electrode current collecting plate; 5. and a second insulating member.

Detailed Description

In the description of the present embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature, i.e. one or more such features. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present invention as the case may be.

Unless specifically defined and limited otherwise, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the description of the present embodiment, a description referring to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Fig. 1 is an exploded view of a cylindrical battery according to an embodiment of the present utility model. Fig. 2 is a cross-sectional view of the cylindrical battery shown in fig. 1. Fig. 3 is a schematic enlarged partial view of the cover plate assembly shown in fig. 2. Fig. 4 is an exploded view of a coverplate assembly in accordance with one embodiment of the present utility model. Fig. 5 is a cross-sectional view of the cover plate assembly of fig. 4. In one embodiment, as shown in fig. 1 to 5, a cylindrical battery includes a case 1, a battery cell 2, and a cap plate assembly 3. The battery cell 2 is arranged in the shell 1, the battery cell 2 is provided with a positive electrode lug 20 and a negative electrode lug 21 which are arranged at intervals, the positive electrode lug 20 and the negative electrode lug 21 are positioned on the end face of the same side of the battery cell 2, and the positive electrode lug 20 and the negative electrode lug 21 are positioned at the same height. The cover assembly 3 is disposed at an end of the housing 1 and located at one ends of the positive electrode tab 20 and the negative electrode tab 21, so as to enclose the battery cell 2 in the housing 1, and the cover assembly 3 has a first lead-out member 30, a second lead-out member 31, and a first insulating member 32 for insulating the first lead-out member 30 and the second lead-out member 31, wherein the first lead-out member 30 is electrically connected with the positive electrode tab 20 to output a positive electrode, and the second lead-out member 31 is electrically connected with the negative electrode tab 21 to output a negative electrode.

In this embodiment, the positive electrode tab 20 and the negative electrode tab 21 of the battery cell 2 are set to be led out at the same side, so that the positive electrode and negative electrode electric connection space is shared, the height of the electrode plate is increased, the capacity of the battery cell 2 is increased, and the negative electrode is integrated on the cover plate assembly 3, so that the flow guiding path between the positive electrode and the negative electrode is not through the shell 1 of the battery cell 2, the circuit path is greatly shortened, the internal resistance of the battery cell 2 is reduced, and the performance of the battery is improved.

In a further embodiment, as shown in fig. 1, 2 and 3. The cylindrical battery further comprises a positive current collecting plate 4 and a second insulator 5. One side of the positive current collecting plate 4 is electrically connected to the positive tab 20, the other side is electrically connected to the first lead-out member 30, and the second insulating member 5 covers the upper surface of the positive current collecting plate 4 partially, specifically, partially covers one side of the positive current collecting plate 4 electrically connected to the first lead-out member 30, so that the positive current collecting plate 4 can be electrically connected to the first lead-out member 30 while being insulated from the second lead-out member 31 in the cover plate assembly 3, and the first lead-out member 30 and the second lead-out member 31 do not interfere with each other.

In the present embodiment, by providing the positive electrode current collecting plate 4 between the first lead-out member 30 and the positive electrode tab 20, on the one hand, connection reliability between the first lead-out member 30 and the positive electrode tab 20 can be ensured, and on the other hand, interference caused by direct connection between the first lead-out member 30 and the positive electrode tab 20 can be avoided.

In addition, the second insulator 5 is provided on the upper surface of the positive electrode current collecting plate 4, so that the positive electrode current collecting plate 4 can be insulated from the cap plate assembly 3, thereby preventing short circuit of the battery.

In one embodiment, as shown in fig. 2 to 5, the second lead-out member 31 includes a cap plate body 310 and a negative electrode current collecting plate 311, and a through hole 3100 is provided at the center of the cap plate body 310, so that the first lead-out member 30 can pass through the through hole 3100 and protrude on the cap plate body 310, thereby enabling the output of the positive electrode of the battery, while the negative electrode current collecting plate 311 has one end electrically connected to the negative electrode tab 21 and the other end electrically connected to the cap plate body 310, thereby enabling the cap plate body 310 to output as the negative electrode of the battery.

The first lead-out member 30 has a connection member 300 and a post 301, wherein the connection member 300 is disposed outside the cap body 310, and the post 301 has one end electrically connected to the positive electrode current collecting plate 4 and the other end electrically connected to the connection member 300 through the through hole 3100, so that the positive electrode of the battery can be output.

The first insulating member 32 includes an upper plastic 320, a lower plastic 321, and a sealing ring 322. The upper plastic 320 is provided with a groove 3200 for accommodating the connector 300, and a mounting hole 3201 is formed at the bottom of the groove 3200, so that the pole 301 can be connected with the connector 300 through the mounting hole 3201, and the lower plastic 321 is sleeved outside the pole 301 and located between the pole 301 and the inner side surface of the cover plate body 310 and located on the upper surface of the lower connection portion of the pole 301, so that the upper surface of the pole 301 is insulated from the lower surface of the cover plate body 310. The sealing ring 322 is sleeved on the outer side of the pole 301 to seal the gap between the cover body 310 and the pole 301.

In this embodiment, the negative electrode is integrated on the cover plate assembly 3, so that the flow guiding path between the positive electrode and the negative electrode does not pass through the casing 1 of the battery core 2, thereby greatly shortening the circuit path, further reducing the internal resistance of the battery core 2, and improving the performance of the battery.

In addition, the cathode current collecting disc 311 does not need to be welded with the shell 1 in the process of the battery cell 2, so that the process efficiency of the battery cell 2 is greatly improved.

In a further embodiment, as shown in fig. 3, 4 and 5, the anode current collecting plate 311 includes a body portion 3110 and a bent portion 3111, the bent portion 3111 is folded over the body portion 3110, and a gap is provided between the bent portion 3111 and the body portion 3110. The lower plastic 321 is provided with an opening 3210 corresponding to the bent portion 3111, and the bent portion 3111 of the anode current collecting plate 311 passes through the opening 3210 to be electrically connected with the cap plate body 310, and the body portion 3110 is electrically connected with the anode current collecting plate 311, so that the cap plate body 310 can serve as a battery anode.

In addition, the positive electrode current collecting plate 4 and the positive electrode tab 20 have a first connection portion 200, the negative electrode current collecting plate 311 and the negative electrode tab 21 have a second connection portion 210, and the first connection portion 200 and the second connection portion 210 are located at the same height, so as to raise the height of the electrode sheet and further increase the capacity of the battery cell 2. The first and second connection parts 200 and 210 may be laser welded.

In the present embodiment, by providing the anode current collecting tab 311 having the bent portion 3111, on the one hand, the connection reliability of the anode current collecting tab 311 and the anode tab 21 is ensured, and on the other hand, the problem that interference occurs when the anode current collecting tab 311 is connected to the anode tab 21 and then to the cap plate body 310 is avoided.

In other embodiments, as shown in fig. 1, a priming hole plug 10 and a hole cap 11 are also provided at the bottom of the housing 1. Wherein, the hole cover 11 is welded to the bottom of the case 1 by laser, thereby securing the sealability of the whole battery.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been shown and described herein in detail, many other variations or modifications of the utility model consistent with the principles of the utility model may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the utility model. Accordingly, the scope of the present utility model should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A cylindrical battery, comprising:

a housing;

The battery cell is arranged in the shell and is provided with positive electrode lugs and negative electrode lugs which are arranged at intervals, the positive electrode lugs and the negative electrode lugs are positioned on the end face of the same side of the battery cell, and the positive electrode lugs and the negative electrode lugs are positioned at the same height;

The cover plate assembly is arranged at one end of the positive electrode lug and one end of the negative electrode lug and is used for sealing the battery cell in the shell, and comprises a first leading-out piece, a second leading-out piece and a first insulating piece, wherein the first insulating piece is used for enabling the first leading-out piece and the second leading-out piece to be spaced apart, the first leading-out piece is connected with the positive electrode lug to output a positive electrode, and the second leading-out piece is connected with the negative electrode lug to output a negative electrode.

2. The cylindrical battery of claim 1, wherein the battery is a battery of the type described in,

Further comprises:

One side of the positive electrode current collecting disc is electrically connected with the positive electrode lug, and the other side of the positive electrode current collecting disc is electrically connected with the first leading-out piece;

And a second insulating member partially covering one side of the positive electrode collecting plate electrically connected to the first lead-out member so as to insulate the positive electrode collecting plate from the second lead-out member when electrically connected to the first lead-out member.

3. The cylindrical battery as claimed in claim 2, wherein,

The second drawing member includes:

The cover plate body is provided with a through hole in the center, and the first leading-out piece passes through the through hole and protrudes out of the cover plate body;

And one end of the negative electrode current collecting disc is electrically connected with the negative electrode lug, and the other end of the negative electrode current collecting disc is electrically connected with the cover plate body.

4. The cylindrical battery according to claim 3, wherein,

The first drawing member includes:

The connecting piece is arranged outside the cover plate body;

and one end of the pole column is electrically connected with the positive current collecting disc, and the other end of the pole column penetrates through the through hole to be electrically connected with the connecting piece.

5. The cylindrical battery as claimed in claim 4, wherein,

The first insulating member includes:

The upper plastic is provided with a groove body for accommodating the connecting piece, and the bottom of the groove body is provided with a mounting hole;

And the lower plastic is positioned between the polar post and the inner side surface of the cover plate body and is positioned on the upper surface of the lower connecting part of the polar post so as to insulate the upper surface of the polar post from the lower surface of the cover plate body.

6. The cylindrical battery as claimed in claim 5, wherein,

Further comprises:

And the sealing ring is sleeved on the outer side of the pole, so as to seal the gap between the cover plate body and the pole.

7. The cylindrical battery as claimed in claim 5, wherein,

The negative electrode current collecting disc comprises a body part and a bending part, wherein the bending part is connected with the body part and is folded over the body part, and a gap is reserved between the bending part and the body part.

8. The cylindrical battery as claimed in claim 7, wherein,

The lower plastic is provided with an opening, and the shape of the opening is matched with the shape of the bending part, so that the bending part is electrically connected with the cover plate body.

9. The cylindrical battery according to claim 3, wherein,

The positive electrode current collecting disc and the positive electrode lug are provided with first connecting parts, the negative electrode current collecting disc and the negative electrode lug are provided with second connecting parts, and the first connecting parts and the second connecting parts are positioned at the same height.

10. The cylindrical battery of claim 1, wherein the battery is a battery of the type described in,

Further comprises:

The priming hole plug is arranged at the bottom of the shell;

and the hole cover is connected with the shell to cover the liquid injection hole.