CN220774529U

CN220774529U - Battery cell

Info

Publication number: CN220774529U
Application number: CN202322375680.2U
Authority: CN
Inventors: 王珂; 张璐璐
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2024-04-12
Anticipated expiration: 2033-09-01

Abstract

The disclosure relates to the technical field of batteries, and discloses a battery; the battery may include: the battery cell comprises a main body part, a first tab and a second tab, wherein the first tab and the second tab are arranged on two opposite end surfaces of the main body part in a first direction; the first pole and the second pole are positioned on one side of the main body part in a second direction, and the second direction is perpendicular to the first direction; the first transfer piece comprises a first tab connecting part and a first pole connecting part which are connected with each other, and the first pole connecting part is electrically connected with the first pole; the second adapter comprises a second lug connection part and a second pole connection part which are connected with each other, and the second pole connection part is electrically connected with the second pole; the ultrasonic welding connection part is connected with the first tab connection part and the first tab; the non-ultrasonic welding connection part is connected with the second lug connection part and the second lug. The battery not only can improve the connection yield between the adapter and the tab, but also can improve the welding efficiency and the connection strength between the adapter and the tab.

Description

Battery cell

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery.

Background

At present, the opposite ends of the main body part of the battery core are provided with a first tab and a second tab in one-to-one correspondence, the first tab is required to be connected to the first pole through a first adapter, the second tab is required to be connected to the second pole through a second adapter, the first tab is connected with the first adapter through welding, and the second tab is also connected with the second adapter through welding.

However, if the first tab and the first adapter and the second tab and the second adapter are all connected by ultrasonic welding, after the ultrasonic welding of the first tab and the first adapter is completed, the ultrasonic welding seat cannot be contained due to space limitation, so that the ultrasonic welding of the second tab and the second adapter cannot be completed; if the first tab is connected with the first adapter and the second tab is connected with the second adapter through laser welding, the risk of hole explosion exists in laser welding, so that the reject ratio of laser welding is increased, and the welding reject ratio between the first tab and the first adapter and between the second tab and the second adapter cannot be guaranteed.

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 present disclosure aims to overcome the disadvantages of the related art described above, and provides a battery.

According to one aspect of the present disclosure, there is provided a battery including:

the battery cell comprises a main body part, a first tab and a second tab, wherein the first tab and the second tab are arranged on two opposite end surfaces of the main body part in a first direction;

the first pole and the second pole are positioned at one side of the main body part in the second direction, the second direction is perpendicular to the first direction, and the surfaces of the battery shell, on which the first pole and the second pole are arranged, are perpendicular to the opposite two end surfaces;

the first transfer piece comprises a first tab connecting part and a first pole connecting part which are connected with each other, and the first pole connecting part is electrically connected with the first pole;

the second adapter comprises a second lug connection part and a second pole connection part which are connected with each other, and the second pole connection part is electrically connected with the second pole;

an ultrasonic welding connection part for connecting the first tab connection part and the first tab;

and the non-ultrasonic welding connection part is used for connecting the second lug connection part and the second lug.

According to the battery disclosed by the disclosure, one end of the battery is connected with the first tab connecting part and the first tab through the ultrasonic welding connecting part, and the opposite other end of the battery is connected with the second tab connecting part and the second tab through the non-ultrasonic welding connecting part, so that after ultrasonic welding is carried out at one end, ultrasonic welding is not required at the other end, and the problem that an ultrasonic welding seat cannot be contained is avoided; and the area of the non-ultrasonic welding connection part is reduced, so that the connection yield between the adapter and the tab can be improved, and the welding efficiency and the connection strength between the adapter and the tab can be improved.

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

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic perspective view of an exemplary embodiment of a battery cell according to the present disclosure.

Fig. 2 is a schematic perspective view of the unit cell of fig. 1 with the bottom wall and the side walls removed.

Fig. 3 is a schematic partial sectional view of the unit cell of fig. 1.

Reference numerals illustrate:

1. a battery case; 11. a cover plate; 12. a bottom wall; 13. a sidewall;

2. a battery cell; 21. a first tab; 22. a second lug; 23. a main body portion;

31. a first pole; 32. a second post;

4. a first adapter; 41. a first tab connection portion; 42. a first pole connection;

5. a second adapter; 51. a second lug connection; 52. a second post connecting portion;

6. ultrasonic welding the connecting part; 7. a non-ultrasonic welded connection; 7a, laser welding the connecting part; 71. a laser welding part;

x, a first direction; y, second direction; z, third direction.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The present disclosure provides a battery, as shown with reference to fig. 1-3, that may include a cell 2, a first adapter 4, a second adapter 5, an ultrasonic welded connection 6, a non-ultrasonic welded connection 7, a first pole 31, and a second pole 32; the battery cell 2 may include a main body 23, a first tab 21 and a second tab 22, where the first tab 21 and the second tab 22 are disposed on opposite end surfaces of the main body 23 in a first direction X; the first and second poles 31 and 32 are located at one side of the body portion 23 in a second direction Y perpendicular to the first direction X, and the surfaces of the battery case 1 where the first and second poles 31 and 32 are disposed are perpendicular to the opposite end surfaces; the first adapter 4 may include a first tab connection portion 41 and a first post connection portion 42 connected to each other, the first post connection portion 42 being electrically connected to the first post 31; the second adapter 5 may include a second tab connection portion 51 and a second post connection portion 52 connected to each other, the second post connection portion 52 being electrically connected to the second post 32; the ultrasonic welding connection portion 6 connects the first tab connection portion 41 and the first tab 21; the non-ultrasonic welding connection portion 7 connects the second tab connection portion 51 and the second tab 22.

In the battery disclosed by the disclosure, one end of the battery is provided with the structure for connecting the first tab connecting part 41 with the first tab 21 through the ultrasonic welding connecting part 6, and the opposite end of the battery is provided with the structure for connecting the second tab connecting part 51 with the second tab 22 through the non-ultrasonic welding connecting part 7, so that after ultrasonic welding is carried out at one end, ultrasonic welding is not required at the other end, and the problem that an ultrasonic welding seat cannot be contained is avoided; and the area of the non-ultrasonic welding connecting part 7 is reduced, so that the connection yield between the adapter and the tab can be improved, and the welding efficiency and the connection strength between the adapter and the tab can be improved.

In the present exemplary embodiment, referring to fig. 1, the unit cells may be quadrangular batteries, that is, the unit cells may be provided in the shape of a rectangular parallelepiped, and correspondingly, the battery case 1 may be provided in the shape of a rectangular parallelepiped, and the battery case 1 may include a cover plate 11, a bottom wall 12, and four side walls 13; the four side walls 13 are arranged in pairs; the four side walls 13 are connected end to end in sequence to form a rectangular cylinder. A cover plate 11 is connected to one side of the four side walls 13, and a bottom wall 12 is connected to the opposite side of the four side walls 13 such that the bottom wall 12 is disposed opposite to the cover plate 11. Also, the bottom wall 12 and the four side walls 13 are integrally formed, i.e., the bottom wall 12 and the four side walls 13 may be formed by an integral molding process instead of being separately formed and then connected as an integral structure, for example, the battery case 1 may be formed by punching. And the cover plate 11 is welded to the sides of the four side walls 13 facing away from the bottom wall 12 such that the cover plate 11 is disposed opposite the bottom wall 12. The bottom wall 12, the cover plate 11 and the four side walls 13 surround a receiving chamber formed to the unit cell.

The battery case 1 and the cover 11 may be made of aluminum, steel, or other metal or alloy materials, but may be made of other materials, which will not be described.

Of course, in other example embodiments of the present disclosure, the bottom wall 12 and the cover plate 11 may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side wall 13 may be provided in one or more and formed around the circular shape, the oval shape, the trapezoid shape, etc., such that the battery case 1 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc.

In the present exemplary embodiment, as shown with reference to fig. 2, the battery cell 2 is provided in the accommodation chamber of the battery case 1. The battery cell 2 may include a main body portion 23, a first tab 21, and a second tab 22; the main body portion 23 may include a first pole piece, a separator, and a second pole piece that are sequentially stacked. The battery cell 2 may be a wound battery cell 2 formed by winding a laminated structure formed by the first electrode sheet, the separator, and the second electrode sheet. The main body 23 is also provided in a substantially rectangular parallelepiped structure to be fitted to the battery case 1 having a rectangular parallelepiped structure. The first pole piece and the second pole piece are coated with different active substances.

In other example embodiments of the present disclosure, the body portion 23 may be laminated, and the first pole piece, the separator, and the second pole piece are all provided in multiple layers, and the body portion 23 is also provided in a rectangular parallelepiped structure in order to be mated with the battery case 1 of a rectangular parallelepiped structure.

In the present exemplary embodiment, the first tab 21 and the second tab 22 may be provided on both end surfaces of the main body 23 facing each other in the first direction X, which may be the longitudinal direction of the main body 23 or the longitudinal direction of the battery.

Specifically, the first tab 21 is connected to the first pole piece, and the first tab 21 is located at a side of the first end surface facing away from the main body 23; a part of the first pole piece extends to protrude from the main body part 23 and is bent to a side of the first end face away from the main body part 23 to form a first pole lug 21; in this case, the first tab 21 may cover all or a part of the first end face.

The second lug 22 is connected to the second lug, and the second lug 22 is located at one side of the second end face away from the main body 23, and may be a part of the second lug extending and protruding from the main body 23, and bent to one side of the second end face away from the main body 23 to form the second lug 22; in this case, the second lug 22 may cover all or a part of the second end face.

The first tab 21 and the second tab 22 are conductive foil areas not provided with an active material coating, i.e., no active material coating is applied to the first tab 21 and the second tab 22, and a current collecting layer is used for transmitting current.

The battery core 2 is used as a core charge-discharge structure of a single battery, and the first tab 21 and the second tab 22 need to be led out to the outside of the battery shell through battery poles to form an anode and a cathode.

In the present exemplary embodiment, the first and second posts 31 and 32 are disposed at the same side of the battery case 1, and in particular, the first and second posts 31 and 32 are both connected to the cap plate 11 such that the first and second posts 31 and 32 are located at one side of the body part 23 in a second direction Y, which is perpendicular to the first direction X and may be a height direction of the battery. So that the surfaces of the battery case 1 where the first and second poles 31 and 32 are disposed are perpendicular to the opposite end surfaces, i.e., the surfaces of the battery case 1 where the first and second poles 31 and 32 are disposed are parallel to the first direction X.

Since the first tab 31 and the second tab 32 are not located on the same side of the main body 23 as the first tab 21 and the second tab 22, it is necessary to electrically connect the first tab 21 to the first tab 31 by the first adapter 4, and it is necessary to electrically connect the second tab 22 to the second tab 32 by the second adapter 5.

The first adapter 4 may include a first tab connection portion 41 and a first post connection portion 42 connected to each other. The first tab connection portion 42 may be provided in a flat plate shape, and the first tab connection portion 41 may be provided in a flat plate shape. The first pole connection portion 42 is located on a side of the main body portion 23 near the first pole 31, and the first pole connection portion 42 is electrically connected to the first pole 31, specifically, the first pole connection portion 42 is electrically connected to the first pole 31 by welding. The first tab connection portion 41 is located at a side of the main body portion 23 near the first tab 21 such that the first tab connection portion 41 is disposed substantially perpendicular to the first post connection portion 42.

The first tab 21 is bent to a side of the first tab connection portion 41 facing away from the main body portion 23, and the first tab connection portion 41 and the first tab 21 are connected by the ultrasonic welding connection portion 6, that is, the first tab connection portion 41 and the first tab 21 are connected into a whole by an ultrasonic welding manner.

The second adapter 5 may include a second tab connection portion 51 and a second post connection portion 52 connected to each other. The second pillar connecting portion 52 may be provided in a flat plate shape, and the second pillar connecting portion 51 may be provided in a flat plate shape. The second post connecting portion 52 is located on a side of the main body portion 23 near the second post 32, and the second post connecting portion 52 is electrically connected to the second post 32, specifically, the second post connecting portion 52 is electrically connected to the second post 32 by welding. The second tab connection portion 51 is located on a side of the main body portion 23 adjacent to the second tab 22 such that the second tab connection portion 51 is disposed substantially perpendicular to the second post connection portion 52.

The second tab 22 is bent to a side of the second tab connection portion 51 facing away from the main body portion 23, and the second tab connection portion 51 and the second tab 22 are connected by the non-ultrasonic welding connection portion 7, that is, the second tab connection portion 51 and the second tab 22 are integrally connected by the non-ultrasonic welding method.

One end of the battery is arranged to connect the first tab connection part 41 with the first tab 21 through the ultrasonic welding connection part 6, and the opposite end is arranged to connect the second tab connection part 51 with the second tab 22 through the non-ultrasonic welding connection part 7, so that after ultrasonic welding is performed at one end, ultrasonic welding is not required at the other end, and the problem that an ultrasonic welding seat cannot be accommodated does not exist; and the area of the non-ultrasonic welding connecting part 7 is reduced, so that the connection yield between the adapter and the tab can be improved, and the welding efficiency and the connection strength between the adapter and the tab can be improved.

Of course, in other exemplary embodiments of the present disclosure, the first tab 21 may be located at a side of the first tab connection portion 41 near the main body portion 23, and the second tab 22 may be located at a side of the second tab connection portion 51 near the main body portion 23.

Specifically, for example, the non-ultrasonic welding connection portion 7 may include a laser welding connection portion 7a, and the second tab connection portion 51 and the second tab 22 may be connected by the laser welding connection portion 7a, that is, the second tab connection portion 51 and the second tab 22 are integrally connected by laser welding.

By connecting the second tab connecting portion 51 and the second tab 22 by the laser welding connecting portion 7a, the welding efficiency and the connection strength between the second tab connecting portion 51 and the second tab 22 can be improved, and the problem that the bonding head and the bonding base or the upper and lower resistance bonding pins are difficult to place by ultrasonic welding or resistance welding can be avoided.

In the present exemplary embodiment, referring to fig. 2, there are at least two cells 2, for example, two cells 2 are arranged in a third direction Z, which is perpendicular to both the first direction X and the second direction Y, that is, the third direction Z is perpendicular to a plane formed by the first direction X and the second direction Y. The third direction Z may be the width direction of the battery.

Both the battery cells 2 include a main body portion 23, a first tab 21 and a second tab 22, and thus, the battery is made to include two main body portions 23, two first tabs 21 and two second tabs 22.

The ultrasonic welding connection portions 6 are provided in at least two, for example, the ultrasonic welding connection portions 6 are provided in two. The two ultrasonic welding connection portions 6 correspondingly connect the first tabs 21 and the first tab connection portions 41 of the two electric cores 2 in a one-to-one correspondence manner, namely, one first tab 21 is connected with the first tab connection portions 41 through one ultrasonic welding connection portion 6, and the two first tabs 21 are connected with one first tab connection portion 41 through the two ultrasonic welding connection portions 6.

The laser welding connection portions 7a are provided in at least two, for example, the laser welding connection portions 7a are provided in two. The two laser welding connection portions 7a connect the second tab 22 and the second tab connection portion 51 of the two battery cells 2 in one-to-one correspondence. That is, one second tab 22 is connected to the second tab connection portion 51 by one laser welding connection portion 7a, and two second tabs 22 are connected to one second tab connection portion 51 by two laser welding connection portions 7 a.

Because laser welding easily has too high local temperature, the formed hole is not welded well, and the risk of breaking and fusing is finally caused. The larger the area of the laser welding connection portion 7a is, the higher the risk of occurrence of open-circuit fusing is, and therefore, the risk of open-circuit fusing can be reduced as much as possible by employing the laser welding connection portion 7a at only one end.

Of course, in other example embodiments of the present disclosure, the battery cells 2 may be provided in three, four, or more, in which case the first tab 21 and the second tab 22 may be provided in three, four, or more, and the ultrasonic welding connection 6 and the laser welding connection 7a may be provided in three, four, or more.

In the present exemplary embodiment, the ratio of the area of the orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface to the area of the orthographic projection of the first tab connection portion 41 on the first reference surface is 0.08 or more and 0.35 or less; for example, the ratio of the area of the orthographic projection of the ultrasonic welding connection 6 on the first reference surface to the area of the orthographic projection of the first tab connection 41 on the first reference surface may be 0.1, 0.12, 0.15, 0.17, 0.2, 0.23, 0.25, 0.28, 0.3, 0.32, and so on.

If the ratio of the area of the orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface to the area of the orthographic projection of the first tab connection portion 41 on the first reference surface is too large, the area of the orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface is too large, that is, the whole area of the ultrasonic welding connection portion 6 is too large, the required welding energy is too large, the welding time is too long, and the welding efficiency is reduced; and the risk of poor welding increases.

If the ratio of the area of the orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface to the area of the orthographic projection of the first tab connection portion 41 on the first reference surface is too small, the area of the orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface is too small, that is, the whole area of the ultrasonic welding connection portion 6 is too small, the connection area between the first tab connection portion 41 and the first tab 21 is too small, the local resistance is too large, and the overcurrent area is insufficient, resulting in an increase of overheat risk.

The numerical range is high in welding efficiency and low in risk of poor welding; and the connection area between the first tab connection portion 41 and the first tab 21 is sufficient, and the overcurrent area is sufficient, without causing an increase in the risk of overheating.

The ratio of the area of the orthographic projection of the non-ultrasonic welding connection portion 7 on the first reference surface to the area of the orthographic projection of the second ear connection portion 51 on the first reference surface is 0.05 or more and 0.3 or less, for example, the ratio of the area of the orthographic projection of the non-ultrasonic welding connection portion 7 on the first reference surface to the area of the orthographic projection of the second ear connection portion 51 on the first reference surface may be 0.07, 0.1, 0.12, 0.15, 0.17, 0.2, 0.23, 0.25, 0.28, or the like.

If the ratio of the area of the orthographic projection of the non-ultrasonic welding connection part 7 on the first reference surface to the area of the orthographic projection of the second lug connection part 51 on the first reference surface is too large, the area of the orthographic projection of the non-ultrasonic welding connection part 7 on the first reference surface is too large, namely the whole area of the non-ultrasonic welding connection part 7 is too large, the required welding energy is too large, the welding time is too long, and the welding efficiency is reduced; and the risk of poor welding increases.

If the ratio of the area of the orthographic projection of the non-ultrasonic welding connection portion 7 on the first reference surface to the area of the orthographic projection of the second tab connection portion 51 on the first reference surface is too small, the area of the orthographic projection of the non-ultrasonic welding connection portion 7 on the first reference surface is too small, that is, the whole area of the non-ultrasonic welding connection portion 7 is too small, the connection area between the second tab connection portion 51 and the second tab 22 is too small, the local resistance is too large, and the overcurrent area is insufficient, resulting in an increased risk of overheating.

The numerical range is high in welding efficiency and low in risk of poor welding; the second lug connection 51 and the second lug 22 have a sufficient connection area and a sufficient overcurrent area, and do not cause an increase in the risk of overheating.

The first reference plane is a plane perpendicular to the first direction X.

In the present exemplary embodiment, the area of the orthographic projection of the ultrasonic welding connection 6 on the first reference surface is larger than the area of the orthographic projection of the non-ultrasonic welding connection 7 on the first reference surface. Ultrasonic welding is weaker than laser welding in energy, so that the connection area between two adjacent tab layers of the first tab 21 is smaller, the ultrasonic welding connection portion 6 comprises a plurality of ultrasonic welding points, and a space exists between the ultrasonic welding points, so that the area of orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface is required to be set larger, and the connection area between the first tab connection portion 41 and the first tab 21 is enough and the overcurrent area is enough.

It should be noted that, the ultrasonic welding connection portion 6 includes a plurality of ultrasonic welding points, and the area of the orthographic projection of the ultrasonic welding connection portion 6 on the first reference surface refers to the area of the entire area formed by orthographic projections of all the ultrasonic welding points included in the ultrasonic welding connection portion 6 on the first reference surface (including the area of the interval between the adjacent two ultrasonic welding points), instead of the sum of the areas of orthographic projections of all the ultrasonic welding points on the first reference surface.

In the present exemplary embodiment, referring to fig. 3, the laser welding connection portion 7a may include at least two laser welding portions 71, for example, the laser welding connection portion 7a may include two laser welding portions 71. In the second direction Y, the adjacent two laser welded portions 71 are arranged at intervals, that is, the adjacent two laser welded portions 71 are not connected as a unit.

So set up, avoid setting up the laser welding connecting portion 7a of great area, reduce the accumulation of laser energy when laser welding, avoid the hole explosion that local regional high temperature leads to reduce the risk of welding through.

Further, the spacing distance H between the adjacent two laser welding parts 71 is 5mm or more and 60mm or less, for example, the spacing distance H between the adjacent two laser welding parts 71 may be 8mm, 10mm, 12mm, 15mm, 17mm, 20mm, 23mm, 25mm, 28mm, 30mm, 32mm, 35mm, 37mm, 40mm, 43mm, 45mm, 48mm, 50mm, 52mm, 55mm, 57mm, or the like.

If the spacing distance H between the adjacent two laser welding parts 71 is excessively large, so that the space accommodating the laser welding parts 71 is small, it is disadvantageous to secure the connection area and the overcurrent area between the second tab connection part 51 and the second tab 22.

If the spacing distance H between two adjacent laser welds 71 is too small, there is still a risk of excessive local area temperature and weld through due to the accumulation of laser energy at the time of laser welding.

The above numerical range not only ensures the connection area and the overcurrent area between the second tab connection portion 51 and the second tab 22; but also ensures that there is no risk of excessive local area temperature and weld-through due to the build-up of laser energy.

In the present exemplary embodiment, in the second direction Y, the height of the battery is 100 mm or more, for example, the height of the battery may be 120 mm, 150 mm, 170 mm, 200 mm, 230 mm, 250 mm, 280 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, or the like.

Since the greater the height of the battery, the greater the heights of the first tab 21 and the second tab 22, the greater the size of the laser welding connection 7a required, and the more likely the risk of excessive temperature and penetration of the localized area due to the accumulation of laser energy during laser welding. Therefore, the structure that one end is set to connect the first tab connection part 41 and the first tab 21 through the ultrasonic welding connection part 6, and the opposite end is set to connect the second tab connection part 51 and the second tab 22 through the non-ultrasonic welding connection part 7 is adopted, which is more beneficial to improving the yield of the battery.

In the present exemplary embodiment, the thickness of the first tab 21 is 5mm or less, for example, the thickness of the first tab 21 may be 1 mm, 1.5 mm, 2mm, 2.5 mm, 3mm, 3.5 mm, 4 mm, 4.5 mm, or the like.

If the thickness of the first tab 21 is too thick, the ultrasonic welding is weaker than the laser welding, which may result in too small connection area between two adjacent tab layers of the first tab 21, and even further may result in no connection between two adjacent tab layers of the first tab 21, resulting in failure of the ultrasonic welding.

The thickness of the first tab 21 is set to be thin, so that the effect of ultrasonic welding can be ensured, thereby ensuring the firmness of the ultrasonic welding connection portion 6.

In the present exemplary embodiment, the first tab 21 is a negative tab, and the second tab 22 is a positive tab. The material of negative pole ear is copper, and the material of anodal ear is aluminium, and the melting point of copper (about 1083.4 ℃) is higher than the melting point of aluminium (about 660.4 ℃) and needs the temperature higher during welding, and first utmost point ear 21 is through ultrasonic welding, and not adopts laser welding, can avoid laser welding's time, and the local regional high temperature that the accumulation of laser energy leads to and the risk of welding through. While the second lug 22 requires a lower temperature during laser welding, there is no risk of excessive temperature in the local area and weld through due to the accumulation of laser energy.

The terms "parallel" and "perpendicular" as used in this application may not only be perfectly parallel, perpendicular, but may also have some error; for example, the included angle between the two is greater than or equal to 0 ° and less than or equal to 5 °, i.e. the two are considered to be parallel to each other; the included angle between the two is more than or equal to 85 degrees and less than or equal to 95 degrees, namely the two are considered to be mutually perpendicular.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed 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.

Claims

1. A battery, comprising:

the first pole and the second pole are positioned on one side of the second direction of the main body part, the second direction is perpendicular to the first direction, and the surfaces of the battery shell, on which the first pole and the second pole are arranged, are perpendicular to the opposite end surfaces;

and the non-ultrasonic welding connection part is used for connecting the second lug connection part with the second lug.

2. The battery of claim 1, wherein the non-ultrasonic welded connection comprises a laser welded connection.

3. The battery of claim 2, wherein the laser welded connection includes at least two laser welded portions, adjacent two of the laser welded portions being spaced apart in the second direction.

4. A battery according to claim 3, wherein a spacing distance between adjacent two of the laser welded portions is 5mm or more and 60mm or less.

5. The battery according to claim 1, wherein the number of the electric cells is at least two, the number of the ultrasonic welding connection parts is at least two, and the at least two ultrasonic welding connection parts correspondingly connect the first tab and the first tab connection parts of the at least two electric cells.

6. The battery of claim 5, wherein the non-ultrasonic welding connection parts are laser welding connection parts, the number of the laser welding connection parts is at least two, and the at least two laser welding connection parts correspondingly connect the second electrode tab and the second electrode tab connection parts of the at least two electric cores.

7. The battery according to any one of claims 1 to 6, wherein a ratio of an area of orthographic projection of the ultrasonic welding connection portion on a first reference surface to an area of orthographic projection of the first tab connection portion on the first reference surface is 0.08 or more and 0.35 or less; the ratio of the area of orthographic projection of the non-ultrasonic welding connection part on the first reference surface to the area of orthographic projection of the second lug connection part on the first reference surface is more than or equal to 0.05 and less than or equal to 0.3, and the first reference surface is perpendicular to the first direction.

8. The battery of any one of claims 1-6, wherein an area of orthographic projection of the ultrasonic welding connection on a first reference plane is larger than an area of orthographic projection of the non-ultrasonic welding connection on the first reference plane, the first reference plane being perpendicular to the first direction.

9. The battery according to any one of claims 1 to 6, wherein a height of the battery in the second direction is 100 mm or more.

10. The battery according to any one of claims 1 to 6, wherein the thickness of the first tab is 5mm or less.

11. The battery of any one of claims 1-6, wherein the first tab is a negative tab and the second tab is a positive tab.