CN219832960U

CN219832960U - Battery and battery pack

Info

Publication number: CN219832960U
Application number: CN202320964631.XU
Authority: CN
Inventors: 许久凌; 刘瑞见; 张璐璐
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-25
Filing date: 2023-04-25
Publication date: 2023-10-13
Anticipated expiration: 2033-04-25

Abstract

The utility model relates to the technical field of batteries, and provides a battery and a battery pack, wherein the battery comprises a battery core and a plurality of polar posts, and the plurality of polar posts comprise: the positive electrode post and the negative electrode post are electrically connected with the battery cell through a non-resistance welding process; and the negative pole post is welded with the battery cell through a resistance welding process. The battery can solve the technical problem that the welding needle is easy to bond with the pole.

Description

Battery and battery pack

Technical Field

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

Background

In the related art, a battery generally includes a tab and a post, and the tab and the post may be welded by a resistance welding process. The positive pole post is including positive pole post and negative pole post, and the melting point of positive pole post in comparison with the negative pole post is lower to when carrying out the welding through resistance welding technology to positive tab and positive pole post, the welding needle bonds to the positive pole post that melts easily, thereby influences welded structure's structural stability, also can influence the follow-up use of welding needle simultaneously.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The utility model provides a battery which can solve the technical problem that a welding needle is easy to adhere to a positive pole post.

The battery includes:

a battery cell;

a plurality of poles, a plurality of including in the pole:

the positive pole is electrically connected with the battery cell through a non-resistance welding process;

and the negative pole post is welded with the electric core through resistance.

The battery provided by the disclosure is characterized in that the battery is provided with the cathode post and the battery core with higher melting points through the resistance welding process, and the cathode post and the battery core welded through the resistance welding process have smaller contact resistance and higher strength. Meanwhile, the positive pole and the battery cell are connected through a non-resistance welding process, so that bonding between the welding needle and the positive pole can be avoided.

The utility model also provides a battery pack which can comprise the battery, the battery in the battery pack can avoid bonding of the welding needle and the positive pole, and meanwhile, the battery pack can enable the negative pole and the battery core to have smaller contact resistance and higher strength.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view of the structure of an exemplary embodiment of a battery of the present disclosure;

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

fig. 3 is an enlarged view of region a in fig. 2;

FIG. 4 is an enlarged view of region B of FIG. 2;

FIG. 5 is a schematic view of the structure of the positive electrode post in the battery shown in FIG. 1;

FIG. 6 is a schematic view of the structure of a negative electrode post in the battery shown in FIG. 1;

fig. 7 is an enlarged view of a partial region C of the negative electrode column shown in fig. 6.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, 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 unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being "on," "under," or "in" or "out" of another element or feature being "on," "under" or "in" or "out" of the other element or elements, it can be directly connected to the other element or elements, or indirectly connected to the other element or elements via intervening elements.

The present exemplary embodiment first provides a battery, as shown in fig. 1-7, fig. 1 is a schematic structural diagram of an exemplary embodiment of the battery of the present disclosure, fig. 2 is a cross-sectional view of the battery of fig. 1, fig. 3 is an enlarged view of a region a in fig. 2, fig. 4 is an enlarged view of a region B in fig. 2, fig. 5 is a schematic structural diagram of a positive electrode post in the battery of fig. 1, fig. 6 is a schematic structural diagram of a negative electrode post in the battery of fig. 1, and fig. 7 is an enlarged view of a partial region C of the negative electrode post of fig. 6.

The battery includes: electric core, a plurality of utmost point post, a plurality of include in the utmost point post: the positive electrode post 2 and the negative electrode post 1, and the positive electrode post 2 is electrically connected with the electric core through a non-resistance welding process; the negative electrode column 1 is welded with the battery cell through a resistance welding process.

The resistance welding process is a common resistance connection process, and the resistance welding process utilizes current to generate heat through a resistance workpiece, so that the surface of the workpiece is melted and a welding seam is formed, and the workpiece connection is realized.

In the present exemplary embodiment, the positive electrode post 2 is electrically connected to the battery cell through a non-resistance welding process, that is, the positive electrode post 2 may be electrically connected to the battery cell through other existing connection manners other than the non-resistance welding process. For example, the positive electrode post 2 may be welded to the battery cell by a laser welding process. The laser welding process utilizes the high energy density of the laser beam to locally heat the surface of the workpiece above the melting point to melt and form a weld. The laser welding has the advantages of high weld quality, small heat affected zone, small deformation, high welding speed and the like.

It should be appreciated that in other exemplary embodiments, the positive electrode post 2 may also be electrically connected to the battery cell by other methods, for example, the positive electrode post 2 may also be snapped to the battery cell or welded to the battery cell by other welding processes.

In the present exemplary embodiment, the melting point of the positive electrode post 2 may be smaller than the melting point of the negative electrode post 1. For example, the positive electrode post 2 may include an aluminum structure, and the negative electrode post 1 may include a copper structure.

In the present exemplary embodiment, as shown in fig. 1 to 7, the anode column 1 may include: a first side 11, a plurality of solder bumps 12, the solder bumps 12 for electrically connecting the cells.

The battery cell comprises a positive electrode lug and a negative electrode lug, wherein the positive electrode post is electrically connected with the positive electrode lug, and the negative electrode post is electrically connected with the negative electrode lug. Because the thickness of the tab is thinner, the tab is easier to melt, so that the tab is easy to be welded in the welding process of the tab and the pole.

The negative electrode column provided in the present exemplary embodiment is formed with a welding projection 12 on the first side 11 thereof. On the one hand, the welding projections 12 are used for electrical connection with the cells of the battery, and the welding projections 12 are easier to melt due to the larger current density passing through the welding projections 12, so that the risk of tab penetration can be reduced. On the other hand, the welding protrusion can enable the pole and the pole lug to have larger welding area, so that the welding stability can be improved, and the contact resistance between the pole lug and the pole lug is reduced.

In this exemplary embodiment, as shown in fig. 1 to 7, the welding bump 12 may include: an extension portion 121, the extension portion 121 including a plurality of cross sections cut along a cross section perpendicular to a protruding direction of the welding protrusion; wherein the area of the cross section gradually increases from the side away from the first side 11 to the side closer to the first side 11. The negative electrode lug can be attached to the outer surface of the welding protrusion 12 through self deformation, and the cross section of the extension part 121 gradually increases from the side far away from the first side 11 to the side close to the first side 11, so that the negative electrode lug cannot generate larger deformation when self deformation occurs, and the risk of damage to the negative electrode lug due to the larger deformation can be reduced through the arrangement.

In the present exemplary embodiment, as shown in fig. 1 to 7, at least part of the structure of the extension 121 may form an extension end of the welding projection 12. I.e. the cross-sectional area of the extension 121 increases gradually from the extension end of the welding projection 12 to the side closer to the first side 11. Since the negative electrode tab has a larger deformation at the end position of the welding protrusion 12, in this exemplary embodiment, at least a part of the structure of the extension portion 121 forms the extension end of the welding protrusion 12, so that the deformation of the negative electrode tab can be reduced at the position where the negative electrode tab is most likely to be damaged, and the yield when the negative electrode tab and the negative electrode post are welded can be improved.

In the present exemplary embodiment, as shown in fig. 1 to 7, the extension 121 may include: the first extension portion 61, the first extension portion 61 is connected to the first side 11, and the first extension portion 61 may include a first rounded side 611 connected to the first side 11, and a tangent line on the first rounded side 611 is located at a side of the first rounded side 611 facing the first extension portion 61. The first rounded side 611 and the first side 11 can form a smaller inclined angle, and the negative electrode tab cannot be deformed greatly at the connection position of the first rounded side 611 and the first side 11, so that the risk of damage to the negative electrode tab due to deformation can be reduced. The smooth side surface can be spherical surface, ellipsoid, etc.

In this exemplary embodiment, as shown in fig. 1 to 7, the extension 121 may further include: a second extension portion 62, the second extension portion 62 is connected to a side of the first extension portion 61 facing away from the first side 11, the second extension portion 62 includes a second rounded side 622, and the first rounded side 611 is connected between the first side 11 and the second rounded side 622; wherein a tangent line on the second rounded side 622 is located at a side of the second rounded side 622 away from the second extension 62. The second rounded side 622 may form a smaller inclination angle with the negative electrode tab, which may reduce the amount of deformation of the negative electrode tab at the contact position with the welding protrusion 12.

In the present exemplary embodiment, in other exemplary embodiments, the welding projections 12 may also be of other structures, for example, the welding projections 12 may also be hemispherical, hemi-ellipsoidal, cylindrical, conical, or the like.

In this exemplary embodiment, as shown in fig. 1-7, the welding projections 12 may be spaced apart on the first side. Wherein the welding protrusions 12 may be equally spaced on the first side 11, the arrangement may facilitate the processing of the welding protrusions 12.

In this exemplary embodiment, the negative electrode tab may include a plurality of single negative electrode tabs stacked and disposed, and only the welding marks formed by the resistance welding process are formed between adjacent single negative electrode tabs. The related art generally pre-welds a plurality of single-piece tabs by ultrasonic welding, and then welds the tab and the tab post assembly by laser welding. The present exemplary embodiment can weld between adjacent single negative electrode tabs and between the negative electrode post and the negative electrode tab by the same one-time resistance welding process. On one hand, the battery can omit the pre-welding of the single negative electrode lug, thereby simplifying the manufacturing process of the battery; on the other hand, the present exemplary embodiment can reduce the contact resistance between the negative electrode tab and the negative electrode tab, and improve the strength of welding between the negative electrode tab and the negative electrode tab.

In this exemplary embodiment, the negative electrode tab and the negative electrode post may be welded in direct contact, i.e., the weld is directly connected between the negative electrode tab and the negative electrode post. It should be appreciated that in other exemplary embodiments, the negative tab and the negative post may also be welded via the tabs.

In the present exemplary embodiment, as shown in fig. 1 to 7, the battery 5 may include a battery case 51, and the battery case 51 includes two large faces 513 disposed opposite to each other, and a plurality of facets 514 located between the two large faces 513, and the plurality of facets 514 and the two large faces 513 form a receiving cavity 512 for receiving the battery cells. Wherein the area of large face 513 is greater than the area of small face 514. As shown in fig. 1-7, the battery 5 includes a negative electrode post assembly 71 and a positive electrode post assembly 72, the negative electrode post assembly 71 includes a negative electrode post 1, the positive electrode post assembly 72 includes a positive electrode post 2, and the negative electrode post assembly 71 and the positive electrode post assembly 72 are disposed on the large surface 513. Wherein, the battery 5 is formed with a notch 52 on a large face 513 on a side facing away from the pole assembly, and a part of the structure of the pole assembly in the battery 5 is positioned in the notch 52 formed by the adjacent battery 5.

In the present exemplary embodiment, as shown in fig. 1 to 7, the battery case 51 is formed with a first through hole 5111 communicating with the accommodating chamber 512. The anode column 1 may further include: a first welded portion 31 and a first connecting portion 41. A first welded part 31 may be located in the receiving chamber 512, and the first welded part 31 may include the first side 11; the first connection portion 41 is connected to the first welding portion 31, the first connection portion 41 passes through the first through hole 5111, and a part of the first connection portion 41 is located outside the accommodating cavity 512. The negative post assembly 71 may also include a first terminal 811. The first terminal 811 may be electrically connected to the first connection portion 41, and the first terminal 811 may be used to be electrically connected to other batteries through a bus bar. One of the first terminals 811 may be connected to the battery cell through a plurality of negative electrode posts 1. The battery may further include: a first insulating seal 91 and a second insulating seal 92, the second insulating seal 92 being sealed between the negative electrode tab 1 and the battery case 51, the first insulating seal 91 being sealed between the first terminal 811 and the battery case 51.

In the present exemplary embodiment, as shown in fig. 1 to 7, the battery case 51 is further formed with a second through hole 5112 communicating with the accommodating chamber 512. The positive electrode post 2 may include: a second welded portion 32, and a second connecting portion 42. A second soldering portion 32 may be located in the receiving cavity 512, the second soldering portion 32 is used for electrically connecting the battery cells, and no soldering bump is provided on the positive electrode post 2. The second connecting portion 42 is connected to the second welding portion 32, the second connecting portion 42 passes through the second through hole 5112, and a part of the structure of the second connecting portion 42 is located outside the accommodating cavity 512. The positive post assembly 72 may also include a second terminal 812. Wherein the second terminal 812 may be electrically connected with the second connection part 42, and the second terminal 812 may be used to electrically connect with other batteries through a bus bar. One of the second terminals 812 may be connected to the battery cell through a plurality of positive electrode posts 2. The battery may further include: the third insulating seal 93, the fourth insulating seal 94, and the adapter piece 82, the third insulating seal 93 is sealed between the positive electrode post 2 and the battery case 51, and the fourth insulating seal 94 is sealed between the second terminal 812 and the battery case 51. The switching piece 82 is electrically connected to the second soldering portion 32, and the switching piece 82 may be soldered to the battery cell.

It should be appreciated that in other exemplary embodiments, the structure of the positive electrode post assembly may be the same as the structure of the negative electrode post assembly shown in fig. 4, and the structure of the negative electrode post assembly may be the same as the structure of the positive electrode post assembly shown in fig. 3. The structure of the positive electrode column assembly and the negative electrode column assembly may be the same.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In other exemplary embodiments, the battery may have any other structure, for example, the battery may be a square battery, that is, the battery may be a quadrangular battery, which mainly refers to a prismatic shape, but does not strictly define whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions. Further, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end faces and a curved surface between the two circular end faces.

The battery can be a laminated battery, the laminated battery is convenient to group, and the battery with longer length can be obtained through processing. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In the present exemplary embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery may be a cylindrical battery, and the cylindrical battery may be disposed on the support plate, thereby forming a battery module.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

It should be noted that the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

The drawings in the present disclosure relate only to the structures to which the present disclosure relates, and other structures may be referred to in general. The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the disclosed embodiments without departing from the spirit and scope of the disclosed embodiments, which are intended to be encompassed within the scope of the appended claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, the battery comprising:

a battery cell;

a plurality of poles, a plurality of including in the pole:

the positive pole (2) is electrically connected with the electric core through a non-resistance welding process;

and the negative pole column (1) is welded with the electric core through resistance.

2. The battery according to claim 1, characterized in that the positive electrode post (2) is laser welded with the cell.

3. The battery according to claim 1, characterized in that the melting point of the positive electrode column (2) is smaller than the melting point of the negative electrode column (1).

4. The battery according to claim 1, characterized in that the positive electrode post (2) comprises an aluminum structure;

and/or, the negative electrode column (1) comprises a copper structure.

5. The battery of claim 1, wherein the post comprises:

a first side (11);

-a plurality of welding projections (12), said welding projections (12) being formed on said first side (11), said welding projections (12) being adapted to electrically connect said electrical cells.

6. The battery according to claim 5, wherein the welding projection (12) includes:

-an extension (121), the extension (121) comprising a plurality of cross sections taken along a cross section perpendicular to the projection direction of the welding projection (12);

wherein the area of the cross section gradually increases from the side away from the first side face (11) to the side close to the first side face (11).

7. The battery according to claim 6, characterized in that the extension (121) comprises:

the first extension part (61) is connected to the first side surface (11), the first extension part (61) comprises a first smooth side surface (611) connected to the first side surface (11), and a tangent line on the first smooth side surface (611) is positioned on one side of the first smooth side surface (611) facing the first extension part (61).

8. The battery according to claim 7, wherein the extension (121) further comprises:

a second extension portion (62) connected to a side of the first extension portion (61) facing away from the first side surface (11), the second extension portion (62) including a second rounded side surface (622), the first rounded side surface (611) being connected between the first side surface (11) and the second rounded side surface (622);

wherein a tangent line on the second rounded side (622) is located at a side of the second rounded side (622) away from the second extension (62).

9. The battery according to claim 6, characterized in that at least part of the structure of the extension (121) forms an extension end of the welding projection (12).

10. The battery according to claim 5, characterized in that the welding projections (12) are spaced apart on the first side (11).

11. The battery of any of claims 1-10, wherein the battery is a quadrangular battery.

12. A battery comprising a battery according to any one of claims 1-11.