CN213989116U

CN213989116U - Battery core and secondary battery

Info

Publication number: CN213989116U
Application number: CN202120052968.4U
Authority: CN
Inventors: 张五堂; 何金磊
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-08-17
Anticipated expiration: 2031-01-08

Abstract

The application provides a pair of battery core and secondary battery, and relates to the technical field of batteries. The battery cell comprises a battery cell main body, a lug and a connecting piece, wherein the lug is connected with the battery cell main body, the connecting piece comprises a first connecting part and a first bending part, the first connecting part is connected with the first bending part to form a preset angle, and one end, away from the battery cell main body, of the lug is connected with the connecting piece and is arranged on the inner side of a corner formed by connecting the first connecting part with the first bending part; the first connecting portion is used for being connected with the electrode column. This electric core structure can shorten the length of utmost point ear, material saving, reduce cost to can restrict the position of utmost point ear, improve the safety in utilization of electric core.

Description

Battery core and secondary battery

Technical Field

The utility model relates to a battery technology field particularly, relates to an electricity core and secondary battery.

Background

In the prior art, a protective sheet is arranged on a tab of a battery cell, burrs at the end part of the protective sheet are easy to pierce the tab, so that the battery cell is short-circuited or broken, and the safety performance of a secondary battery is reduced; and because the tab needs to be bent, a large gap needs to be left between the tab and the connecting sheet, so that the tab is longer, materials are wasted, and the cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electricity core and secondary battery, its structure that has cancelled the screening glass prevents that the screening glass from stabbing utmost point ear. Meanwhile, the connecting piece can fix the position of the lug, improve the use safety performance of the battery core, reduce the length of the lug, save materials and reduce cost.

The embodiment of the utility model is realized like this:

in a first aspect, the utility model provides an electric core, which comprises an electric core main body, a tab and a connecting piece, wherein the tab is connected with the electric core main body, the connecting piece comprises a first connecting part and a first bending part, the first connecting part is connected with the first bending part to form a preset angle, and one end of the tab, which is far away from the electric core main body, is connected with the connecting piece and is arranged at the inner side of a corner part formed by the connection of the first connecting part and the first bending part; the first connecting portion is used for being connected with the electrode column.

In an alternative embodiment, the first connection portion forms a predetermined angle with the first bent portion that is less than or equal to ninety degrees.

In an optional embodiment, the tab includes a second connecting portion and a second bending portion, which are connected to each other, the cell main body is connected to the second connecting portion, and the second connecting portion is connected to a side of the first bending portion, which is close to the first connecting portion.

In an alternative embodiment, the second connecting portion is welded to a side of the first bending portion close to the first connecting portion.

In an alternative embodiment, the second connecting portion forms an angle with the second bent portion that is less than or equal to ninety degrees.

In an optional embodiment, the tab further includes a root connection portion, the root connection portion is disposed at one end of the second connection portion, which is far away from the second bending portion, and the root connection portion is connected to the cell main body.

In an alternative embodiment, the first connecting portion has a through hole formed therein, and the through hole is used for connecting with the electrode column.

In a second aspect, the present invention provides a secondary battery, which comprises a casing and an electric core as in any one of the previous embodiments, wherein the casing is provided with an electrode column, and the connecting member is connected with the electrode column. The battery cell comprises a battery cell main body, a lug and a connecting piece, wherein the lug is connected with the battery cell main body, the connecting piece comprises a first connecting part and a first bending part, the first connecting part is connected with the first bending part to form a preset angle, and one end of the lug, which is far away from the battery cell main body, is connected with the connecting piece and is arranged on the inner side of a corner part formed by connecting the first connecting part with the first bending part; the first connecting portion is used for being connected with the electrode column.

In an alternative embodiment, the electrode column comprises a body and a projection provided on the body, the projection being inserted into the through hole of the connector and welded to the connector.

In an optional embodiment, the bump is sleeved with an insulating sheet, and the insulating sheet is used for preventing the connecting piece, the shell and the body from contacting with each other.

The embodiment of the utility model provides an electricity core and secondary battery, its beneficial effect includes:

the utility model provides an electric core, connecting piece are equipped with first connecting portion and first portion of bending, and first portion of bending is used for being connected with utmost point ear, can restrict the position of utmost point ear, improve the security performance that electric core used, can shorten the clearance between utmost point ear and the connecting piece again, reduce the length of utmost point ear, reach material saving, reduction in production cost's purpose. In addition, this electricity core structure has cancelled the structure of screening glass, effectively prevents that the burr of screening glass tip from stabbing utmost point ear, improves structural reliability and electric core life.

The utility model provides a secondary battery, including the above-mentioned electric core, the first connecting portion of connecting piece is connected with the electrode post on the casing, realizes the utmost point ear of electric core and the electricity of electrode post to be connected, and the structure is reliable, can carry out fine spacing to utmost point ear, improves the security performance; but also can shorten the length of the tab, save materials and reduce production cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a battery cell provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a connecting member of a battery cell according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a state of a secondary battery according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another state of a secondary battery according to an embodiment of the present invention;

fig. 5 is a schematic view of a connection structure between a case and a connector of a secondary battery according to an embodiment of the present invention;

fig. 6 is a schematic view of a partial cross-sectional structure of a secondary battery according to an embodiment of the present invention.

Icon: 100-electric core; 110-a cell body; 120-pole ear; 121-a second connection; 123-a second bend; 125-connection root; 130-a connector; 131-a first connection; 133-a first bend; 135-a through hole; 200-a secondary battery; 210-an electrode column; 211-a body; 213-a bump; 220-an insulating sheet; 230-a top cover sheet; 201-shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the prior art, a protection sheet is arranged on a tab of a battery cell, and burrs at the end part of the protection sheet are easy to stab or puncture the tab, so that the battery cell is short-circuited or broken, and the safety performance of a secondary battery is reduced. In addition, because the tab needs to be bent, a large gap is left between the tab and the connecting sheet, so that the length of the tab is long, materials are wasted, and the production cost is increased. The utmost point ear does not have spacingly after bending, leads to utmost point ear very easily with top cap or casing contact, has the safety risk.

In order to solve at least one technical defect in the prior art, the embodiment of the utility model provides an electricity core 100 and secondary battery 200 including this electricity core 100 can shorten utmost point ear 120's length, and reduce cost improves the security performance simultaneously.

Referring to fig. 1 and fig. 2, a battery cell 100 provided in this embodiment includes a battery cell main body 110, a tab 120, and a connecting member 130, where the tab 120 is connected to the battery cell main body 110, the connecting member 130 includes a first connecting portion 131 and a first bending portion 133, the first connecting portion 131 is connected to the first bending portion 133 to form a predetermined angle, and one end of the tab 120 away from the battery cell main body 110 is connected to the connecting member 130 and is disposed inside a corner formed by the first connecting portion 131 and the first bending portion 133; the first connection portion 131 is used to connect with the electrode column 210. Because the connecting piece 130 is the design of bending, first portion 133 of bending is connected with utmost point ear 120, can shorten the interval between connecting piece 130 and the utmost point ear 120, shortens the length of utmost point ear 120 promptly, can carry on spacingly again to utmost point ear 120, prevents contact such as utmost point ear 120 and casing 201 or top cap, reduces safe risk. This electricity core 100 structure has cancelled prior art's screening glass structure, and the structure is simpler, and it is more convenient to connect to can avoid the tip burr of screening glass to utmost point ear 120's damage, improved the security performance greatly.

It should be noted that the connecting member 130 in this embodiment is substantially L-shaped, that is, the first connecting portion 131 and the first bending portion 133 form a corner structure. The predetermined angle of the corner formed by the first connecting portion 131 and the first bending portion 133 is less than or equal to ninety degrees, i.e., the corner may be a right angle or an acute angle, and is not particularly limited herein. Through setting up the corner that is less than or equal to 90 degrees, can carry out better spacing to utmost point ear 120, prevent utmost point ear 120 and casing 201 or top cap contact, reduce safe risk to the volume is littleer, and the structure is compacter. Meanwhile, the length of the tab 120 can be effectively shortened, materials are saved, and production cost is reduced. The first connecting portion 131 and the first bending portion 133 of the connecting member 130 may be integrally formed or fixedly connected in a separate manner, and in this embodiment, for convenience of processing and assembling connection, the first connecting portion 131 and the first bending portion 133 are integrally formed, that is, the first connecting portion 131 and the first bending portion 133 are an integral part.

Optionally, the tab 120 includes a second connection portion 121 and a second bending portion 123 connected to each other, the cell main body 110 is connected to the second connection portion 121, and the tab 120 is disposed inside a corner of the connection member 130, that is, the second connection portion 121 is connected to a side of the first bending portion 133 close to the first connection portion 131. It is easy to understand that the first connection portion 131 is used to connect with the electrode column 210 on the casing 201, and the first bending portion 133 is connected with the tab 120, so that the electrical connection between the tab 120 and the electrode column 210 can be realized. In this embodiment, the second connection portion 121 of the tab 120 is welded to the first bending portion 133 at a side close to the first connection portion 131, that is, the second connection portion 121 is connected to the inside of the corner of the connection member 130 and is welded to the first bending portion 133, so as to electrically connect the first bending portion 133 and the second connection portion 121. It can be understood that, after the second connecting portion 121 is welded to the first bending portion 133, the second bending portion 123 of the tab 120 is also located inside the corner of the connecting member 130, and contacts or abuts against the first connecting portion 131, so that the first bending portion 133 has a limiting effect on the second connecting portion 121, further, the first connecting portion 131 has a limiting effect on the second bending portion 123, and can achieve a better fixing effect on the tab 120, thereby preventing the tab 120 from contacting with the housing 201 or the top cover, and reducing safety risks.

It should be noted that, if the corner of the connecting member 130 is a right angle, after the connecting member 130 is connected to the tab 120, the first bending portion 133 of the connecting member 130 may be further bent, and the bending direction is a direction close to the first connecting portion 131, so that the corner angle formed by the first bending portion 133 and the first connecting portion 131 is reduced, and thus, the distance between the end of the first bending portion 133 and the cell main body 110 may be increased, and the burr at the end of the first bending portion 133 may be prevented from damaging the cell main body 110, thereby improving the safety performance.

It is easily understood that the tab 120 is provided inside the corner of the connection member 130, and the second connection part 121 and the second bent part 123 of the tab 120 also form a similar corner, i.e., the angle formed by the second connection part 121 and the second bent part 123 is less than or equal to ninety degrees. Further, the tab 120 further includes a root portion 125, the root portion 125 is disposed at one end of the second connection portion 121 far away from the second bending portion 123, and the root portion 125 is connected to the cell main body 110. The arrangement of the connection root 125 can improve the reliability of connection between the tab 120 and the cell main body 110.

Further, the first connection portion 131 of the connection member 130 is formed with a through hole 135, and the through hole 135 is used for connecting with the electrode column 210. The number of the through holes 135 may be one or more, depending on the number of the electrode posts 210 on the housing 201. The cross-sectional shape of the through-hole 135 may be square, circular, oval or any other shape, and is not particularly limited thereto. In this embodiment, the cross-sectional shape of the through-hole 135 is circular and is adapted to the cross-sectional shape of the electrode column 210. Optionally, the electrode column 210 is disposed through the through hole 135, and the electrode column 210 is welded to the first connection portion 131 to achieve electrical connection.

Referring to fig. 3 to fig. 6, an embodiment of the present invention further provides a secondary battery 200, which includes a casing 201 and the battery cell 100 as described above, wherein the casing 201 is provided with an electrode post 210, and the connecting member 130 is connected to the electrode post 210. Specifically, the battery cell 100 includes a battery cell main body 110, a tab 120 and a connecting member 130, the tab 120 is connected to the battery cell main body 110, the connecting member 130 includes a first connecting portion 131 and a first bending portion 133, the first connecting portion 131 is connected to the first bending portion 133 to form a predetermined angle, one end of the tab 120 away from the battery cell main body 110 is connected to the connecting member 130, and is disposed inside a corner formed by connecting the first connecting portion 131 to the first bending portion 133; the first connection portion 131 is connected to the electrode column 210.

Further, the electrode column 210 includes a body 211 and a protrusion 213 provided on the body 211, and the protrusion 213 is inserted into the through hole 135 of the connection member 130 and is welded with the connection member 130. It is easy to understand that the first connection portion 131 of the connection member 130 is welded to the protrusion 213 at the outer side of the corner, so as to fixedly and electrically connect the electrode column 210 and the connection member 130. The bump 213 is sleeved with an insulating sheet 220, and the insulating sheet 220 is sandwiched between the connecting member 130, the body 211 and the casing 201, so as to prevent the tab 120, the electrode column 210 and the casing 201 from contacting each other. Optionally, a clamping groove is formed in one side, away from the protruding block 213, of the insulating sheet 220, a top cover plate 230 is arranged in the clamping groove, the top cover plate 230 is fixedly connected with the housing 201, and optionally, the top cover plate 230 is welded to the housing 201.

The embodiment of the utility model provides a battery cell 100 and secondary battery 200, its assembly principle is as follows:

the connecting member 130 adopts a right-angle corner structure, the second connecting portion 121 of the tab 120 is arranged at the inner side of the corner, and the first bending portion 133 of the connecting member 130 is welded with the second connecting portion 121 of the tab 120; the second bending portion 123 of the tab 120 abuts against the first connecting portion 131 at the inner side of the corner, and the first connecting portion 131 further limits the tab 120, as shown in fig. 3. After the tab 120 is welded to the connection member 130, the first bending portion 133 is further bent to reduce the angle of the corner of the connection member 130, as shown in fig. 4, even if the first bending portion 133 is bent toward the first connection portion 131, the burr at the end of the first bending portion 133 can be prevented from stabbing the cell main body 110. The battery cell 100 is placed in the casing 201, the electrode column 210 on the casing 201 passes through the through hole 135 on the first connection portion 131 of the connection member 130, and the protrusion 213 of the electrode column 210 is welded to the first connection portion 131, so that the electrode tab 120 is electrically connected to the electrode column 210, and the assembly of the casing 201 and the battery cell 100 is completed.

To sum up, the embodiment of the present invention provides an electric core 100 and a secondary battery 200, which have the following beneficial effects:

the embodiment of the utility model provides an electric core 100, this electric core 100 has cancelled the screening glass structure, and production technology is simpler. The connecting piece 130 is provided with a bent corner structure, so that the limit of the tab 120 can be realized, the tab 120 is prevented from contacting with the shell 201 or the top cover and the like, and the safety performance is improved; but also can shorten the length of the tab 120, save materials and reduce production cost. And after the tab 120 is welded to the connecting member 130, the connecting member 130 is further bent to reduce the corner angle, so that the first bending portion 133 of the connecting member 130 is prevented from being inserted into the battery cell main body 110 to damage the battery cell main body 110, and the safety performance is further improved.

The embodiment of the utility model provides a secondary battery 200, including casing 201 and foretell electric core 100, electric core 100 locates in casing 201, and the electrode column 210 on casing 201 passes through-hole 135 on the connecting piece 130, welds the lug 213 of electrode column 210 and the first connecting portion 131 of connecting piece 130, realizes connecting piece 130 and electrode column 210's electricity to be connected, and then realizes utmost point ear 120 and electrode column 210's electricity to be connected. The assembly is simple and convenient, the electrical connection is reliable, the production cost is reduced, the safety performance of the secondary battery 200 is good, and the service life is long.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The battery cell is characterized by comprising a cell main body (110), a tab (120) and a connecting piece (130), wherein the tab (120) is connected with the cell main body (110), the connecting piece (130) comprises a first connecting part (131) and a first bending part (133), the first connecting part (131) is connected with the first bending part (133) to form a preset angle, one end, far away from the cell main body (110), of the tab (120) is connected with the connecting piece (130) and is arranged inside a corner formed by connecting the first connecting part (131) with the first bending part (133); the first connecting portion (131) is used for connecting with an electrode column (210).

2. The cell of claim 1, wherein the first connection portion (131) forms a predetermined angle with the first bend (133) that is less than or equal to ninety degrees.

3. The battery cell of claim 2, wherein the tab (120) comprises a second connecting portion (121) and a second bending portion (123) connected with each other, the cell body (110) is connected with the second connecting portion (121), and the second connecting portion (121) is connected to one side of the first bending portion (133) close to the first connecting portion (131).

4. The cell of claim 3, wherein the second connection portion (121) is welded to a side of the first bent portion (133) adjacent to the first connection portion (131).

5. The battery cell of claim 3, wherein the second connection portion (121) forms an angle with the second bend (123) that is less than or equal to ninety degrees.

6. The battery cell of claim 3, wherein the tab (120) further comprises a connection root portion (125), the connection root portion (125) is disposed at an end of the second connection portion (121) away from the second bending portion (123), and the connection root portion (125) is connected to the cell main body (110).

7. The cell of any one of claims 1 to 6, wherein a through hole (135) is formed in the first connecting portion (131), and the through hole (135) is used for connecting with the electrode column (210).

8. A secondary battery, characterized by comprising a casing (201) and the electric core of any of claims 1 to 7, wherein the electrode column (210) is arranged on the casing (201), and the connecting member (130) is connected with the electrode column (210).

9. The secondary battery according to claim 8, wherein the electrode shaft (210) comprises a body (211) and a protrusion (213) provided on the body (211), and the protrusion (213) is inserted into the through hole (135) of the connection member (130) and welded with the connection member (130).

10. The secondary battery according to claim 9, wherein an insulation sheet (220) is sleeved on the protrusion (213), and the insulation sheet (220) is used for preventing the connection member (130), the housing (201) and the body (211) from contacting each other.