CN115347279A

CN115347279A - Battery, battery pack, and battery manufacturing method

Info

Publication number: CN115347279A
Application number: CN202110526780.3A
Authority: CN
Inventors: 潘芳芳; 许久凌; 张勇杰; 齐彬伟
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2022-11-15

Abstract

The invention relates to the technical field of batteries, and provides a battery, a battery pack and a battery manufacturing method. The battery comprises a shell, wherein the shell comprises a containing cavity which is provided with a first opening and a second opening which are opposite; the first cover body is connected to one end of the shell to seal the first opening; the second cover body is connected to the other end of the shell to seal the second opening; the battery cell is positioned in the accommodating cavity; wherein, the casing still includes first welding end and second welding end, and first welding end includes first flange limit, and the both ends on first flange limit extend to first opening and second opening respectively, the big surface and the welding of second welding end on first flange limit to make the casing be formed with and hold the chamber. The large surface of the first flange edge is welded with the second welding end, so that the welding area of the first welding end and the second welding end is increased, welding is facilitated, and the stability after welding is high.

Description

Battery, battery pack, and battery manufacturing method

Technical Field

The invention relates to the technical field of batteries, in particular to a battery, a battery pack and a battery manufacturing method.

Background

With the increasing demand of people for the energy density of batteries, the development trend of battery technology is high energy density, and the technical means for improving the energy density of batteries can be performed not only from the electrode active material end but also from the battery structure end, for example, the energy density of batteries can be improved by reducing the proportion of structural members such as battery shells and the like in the whole batteries.

Since the battery case is thinner in order to reduce the mass of the battery case, a problem of difficulty in packaging the case is encountered. The battery in the related art includes a casing assembly, and the casing assembly includes a casing and two covers, and the covers are connected to two openings of the casing, so that the battery core is sealed.

Disclosure of Invention

The invention provides a battery, a battery pack and a battery manufacturing method, which aim to improve the battery structure.

According to a first aspect of the present invention, there is provided a battery comprising:

the shell comprises an accommodating cavity, and the accommodating cavity is provided with a first opening and a second opening which are opposite;

the first cover body is connected to one end of the shell to seal the first opening;

the second cover body is connected to the other end of the shell to seal the second opening;

the battery cell is positioned in the accommodating cavity;

wherein, the casing still includes first welding end and second welding end, and first welding end includes first flange limit, and the both ends on first flange limit extend to first opening and second opening respectively, the large surface and the welding of second welding end on first flange limit to make the casing be formed with and hold the chamber.

The battery provided by the embodiment of the invention comprises a shell, a first cover body, a second cover body and a battery cell, wherein the battery cell is arranged in a sealed accommodating cavity formed by the shell, the first cover body and the second cover body. Be provided with first flange limit through the first welding end at the casing, and make the big surface and the second welding end welding on first flange limit to increased the welding area of first welding end and second welding end, not only convenient welding, and the stability after the welding is higher.

According to a second aspect of the present invention, there is provided a battery pack comprising the above battery.

The battery of the battery pack provided by the embodiment of the invention comprises a shell, a first cover body, a second cover body and a battery cell, wherein the battery cell is arranged in a sealed accommodating cavity formed by the shell, the first cover body and the second cover body. Be provided with first flange limit through the first welding end at the casing, and make the big surface and the second welding end welding on first flange limit to increased the welding area of first welding end and second welding end, not only convenient welding, and the stability after the welding is higher.

According to a third aspect of the present invention, there is provided a battery manufacturing method including:

providing a housing comprising a receiving cavity having first and second opposing openings;

providing a battery cell, wherein the battery cell is positioned in the accommodating cavity;

providing a first cover body connected to one end of the shell to seal the first opening;

providing a second cover body, wherein the second cover body is connected to the other end of the shell to seal the second opening;

wherein, the casing still includes first welding end and second welding end, and first welding end includes first flange limit, and the both ends on first flange limit extend to first lid and second lid respectively, the large surface and the welding of second welding end on first flange limit to make the casing be formed with and hold the chamber.

In the battery manufacturing method of the embodiment of the invention, the battery cell is arranged in the sealed accommodating cavity formed by the shell, the first cover body and the second cover body. Be provided with first flange limit through the first welding end at the casing, and make the big surface and the second welding end welding on first flange limit to increased the welding area of first welding end and second welding end, not only convenient welding, and the stability after the welding is higher.

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 be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a schematic structural view of a case and a first cover of a battery according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating the construction of a battery case and second cover according to one exemplary embodiment;

FIG. 3 is a schematic diagram of a housing of a battery according to an exemplary embodiment;

FIG. 4 is a partial schematic structural view of a housing of a battery according to an exemplary embodiment;

FIG. 5 is another partial schematic structural view of a housing of a battery according to an exemplary embodiment;

fig. 6 is a partial schematic structural view of a first cover of a battery according to an exemplary embodiment;

fig. 7 is a partial structural view of a second cover of a battery according to an exemplary embodiment;

fig. 8 is a partially exploded schematic view of a cell and post assembly of a battery according to an exemplary embodiment;

fig. 9 is a schematic flow diagram illustrating a method of manufacturing a battery according to an exemplary embodiment.

The reference numerals are illustrated below:

10. a housing; 11. an accommodating chamber; 111. a first opening; 112. a second opening; 12. a first weld end; 121. a first flanged edge; 13. a second weld end; 131. a second flanged edge; 14. a first plate body; 15. a second plate body; 16. a third flange edge; 17. a first void; 18. a fourth flange edge; 19. a second void; 20. a first cover body; 21. a first cover body flange; 22. a first protrusion; 30. a second cover body; 31. a second cover body flange; 32. a second protrusion; 40. an electric core; 41. a cell main body; 42. a tab; 50. and (4) a pole component.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the 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, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" object or "an" object are also intended to mean one of possibly multiple such objects.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in the context of a connection between one element or feature and another element(s), "on," "under," or "inside" or "outside," it can be directly connected to the other element(s) "on," "under" or "inside" or "outside," or indirectly connected to the other element(s) "on," "under" or "inside" or "outside" through intervening elements.

An embodiment of the present invention provides a battery, please refer to fig. 1 to 8, the battery includes: a housing 10, the housing 10 including a containing cavity 11, the containing cavity 11 having a first opening 111 and a second opening 112 opposite to each other; a first cover 20, wherein the first cover 20 is connected to one end of the casing 10 to close the first opening 111; a second cover 30, wherein the second cover 30 is connected to the other end of the casing 10 to close the second opening 112; the battery cell 40 is positioned in the accommodating cavity 11; the housing 10 further includes a first welding end 12 and a second welding end 13, the first welding end 12 includes a first flange 121, two ends of the first flange 121 extend to the first opening 111 and the second opening 112 respectively, and a large surface of the first flange 121 is welded to the second welding end 13, so that the housing 10 is formed with the accommodating cavity 11.

The battery according to an embodiment of the present invention includes a case 10, a first cover 20, a second cover 30, and a battery cell 40, wherein the battery cell 40 is mounted in a sealed accommodating cavity 11 formed by the case 10, the first cover 20, and the second cover 30. First flange 121 is provided through first welding end 12 at casing 10, and makes the big surface and the welding of second welding end 13 of first flange 121 to increased first welding end 12 and the welding area of second welding end 13, not only convenient welding, and the stability after the welding is higher.

It should be noted that the large surface of the first flange 121 is the largest surface of the first flange 121. The first flange 121 has an end face and a side face in the circumferential direction, and the area of the end face is larger than that of the side face, so that the large surface of the first flange 121 can be understood as the end face of the first flange 121, so that the contact area between the first flange 121 and the second welding end 13 is large, and the subsequent welding quality is ensured.

Alternatively, the receiving cavity 11 is a rectangular cavity, as shown in fig. 3, the housing 10 is a rectangular body structure with two open ends, that is, the receiving cavity 11 has a first opening 111 and a second opening 112 opposite to each other, and the first welding end 12 and the second welding end 13 can be understood as being formed by welding two free ends to form a circumferentially closed rectangular body structure. In order to ensure that the first welding end 12 and the second welding end 13 have a larger contact area, a first flange 121 is formed on the first welding end 12, and the large surface of the first flange 121 is attached to the second welding end 13, so that the subsequent welding quality can be ensured.

Both ends of the first flange edge 121 extend to the first opening 111 and the second opening 112 respectively, i.e. the length of the first flange edge 121 is the length of the housing 10, so as to form a complete and reliable weld joint.

The housing 10 further comprises a first welded end 12 and a second welded end 13, i.e. a structure not formed as a circumferential closure has two free ends, which here are to be understood as a first welded end 12 and a second welded end 13, and the first welded end 12 and the second welded end 13 are not particularly finger-faced, where the first welded end 12 and the second welded end 13 are two solid structures. Thus, the first weld end 12 comprises a first flange edge 121, i.e. the first weld end 12 may comprise only the first flange edge 121, the first flange edge 121 being used for making a connection with the second weld end 13. When the second welding terminal 13 includes the second flange 131, the second welding terminal 13 may also include only the second flange 131, thereby achieving the connection between the first flange 121 and the second flange 131.

In one embodiment, as shown in fig. 4 and 5, the second welding terminal 13 includes a second flange 131, two ends of the second flange 131 respectively extend to the first opening 111 and the second opening 112, and the first flange 121 is welded to the second flange 131, so that a reliable connection between the first welding terminal 12 and the second welding terminal 13 can be ensured, and the welding quality can be ensured.

In one embodiment, as shown in fig. 2, the housing 10 includes two opposite first boards 14 and two opposite second boards 15, and the second boards 15 connect the two first boards 14, that is, the housing 10 has a rectangular structure, and finally forms a rectangular battery.

In one embodiment, the first welding end 12 and the second welding end 13 are located on the first plate 14 or the second plate 15, that is, the welding seam formed by the first welding end 12 and the second welding end 13 is located at the middle position of the casing 10, and the first welding end 12 and the second welding end 13 may be stacked on top of each other, for example, the first flange edge 121 may be pressed on the second flange edge 131. Alternatively, the first welding end 12 and the second welding end 13 may be stacked left and right, that is, the large surface of the first flange 121 and the large surface of the second flange 131 are directly attached to each other, and both the first flange 121 and the second flange 131 are perpendicular to the first plate 14 or the second plate 15.

In one embodiment, one of the first welding end 12 and the second welding end 13 is located on the first plate 14, and the other is located on the second plate 15, that is, the welding seam formed by the first welding end 12 and the second welding end 13 is located at the corner of the casing 10, in this case, the first welding end 12 and the second welding end 13 may be stacked left and right, that is, the large surface of the first flange 121 and the large surface of the second flange 131 are directly attached, and the first flange 121 may be parallel to the first plate 14 where the first flange is located, and the second flange 131 is perpendicular to the second plate 15 where the second flange is located.

In one embodiment, as shown in fig. 5, the housing 10 further includes: a third flange 16, wherein one end of at least one of the two first boards 14 and the two second boards 15 is provided with the third flange 16; the first cover 20 is welded to the large surface of the third flange 16, so that the first cover 20 and the housing 10 can be welded conveniently, and the welding quality of the first cover and the housing can be ensured.

In one embodiment, as shown in fig. 6, a first cover body flange 21 is disposed on the first cover body 20, the first cover body flange 21 is welded to the third cover body flange 16, and the first cover body flange 21 and the third cover body flange 16 increase the welding area between the first cover body 20 and the housing 10, so as to ensure good welding quality between the first cover body 20 and the housing 10, and avoid the problems of welding insecurity between the first cover body and the housing.

In one embodiment, as shown in fig. 5, two adjacent third flanges 16 on the first board 14 and the second board 15 are spaced apart from each other to form a first gap 17, a first protrusion 22 is disposed on the first cover flange 21, and the first protrusion 22 is adapted to the first gap 17; the first protrusion 22 is welded to two adjacent third flanges 16, so that the welding seam between the first cover body 20 and the housing 10 is a sealed structure, thereby ensuring the sealing performance of the welding.

It should be noted that the third flange 16 on the first board 14 is substantially perpendicular to the first board 14, and correspondingly, the third flange 16 on the second board 15 is substantially perpendicular to the second board 15, so that it is required to ensure that the first board 14 and the two adjacent third flanges 16 on the second board 15 are arranged at an interval, and the first protrusion 22 fills the first gap 17, so that after the welding of the first cover flange 21 and the third flange 16 is completed, the first protrusion 22 and the two adjacent third flanges 16 need to be welded, so as to form a sealed weld joint.

In one embodiment, as shown in fig. 4, the case 10 further includes a fourth flange 18, the other end of at least one of the two first boards 14 and the two second boards 15 is provided with the fourth flange 18, and the second cover 30 is welded to the large surface of the fourth flange 18, so that the welding of the second cover 30 to the case 10 can be facilitated, and the welding quality of the two can be ensured.

In one embodiment, as shown in fig. 7, a second cover body flange 31 is disposed on the second cover body 30, the second cover body flange 31 is welded to the fourth flange 18, and the second cover body flange 31 and the fourth flange 18 increase the welding area between the second cover body 30 and the housing 10, so as to ensure good welding quality between the second cover body and the housing 10, and avoid the problems of welding insecurity between the second cover body and the housing.

In one embodiment, as shown in fig. 4, adjacent two fourth flange edges 18 on the first plate 14 and the second plate 15 are spaced apart from each other to form a second gap 19, a second protrusion 32 is provided on the second cover flange edge 31, the second protrusion 32 is adapted to the second gap 19, and the second protrusion 32 is welded to the adjacent two fourth flange edges 18, so that the welding seam between the second cover 30 and the housing 10 is a sealed structure, thereby ensuring the tightness of the welding.

In one embodiment, as shown in fig. 8, the battery further includes a pole assembly 50; the housing 10 is provided with the pole assembly 50, the pole assembly 50 may be disposed on the first plate 14, and the area of the first plate 14 is larger than that of the second plate 15, so as to provide sufficient supporting force for the pole assembly 50. In certain embodiments, it is not excluded that the pole assembly 50 may be provided on the second plate body 15.

The two pole assemblies 50 in a pair may be disposed on one first plate 14, but may also be disposed on two first plates 14, respectively.

Optionally, at least one of the first cover 20 and the second cover 30 is provided with a pole assembly 50, so as to conveniently achieve connection with the battery cell 40.

The two pole assemblies 50 in a pair may be both disposed on the first cover 20 or the second cover 30, or the two pole assemblies 50 in a pair may be disposed on the first cover 20 and the second cover 30, respectively.

As shown in fig. 8, the battery cell 40 includes a battery cell main body 41 and a tab 42, the tab 42 extends from the length direction of the battery cell main body 41, wherein the tab 42 and the terminal assembly 50 may be directly connected, that is, the tab 42 and the terminal assembly 50 may be directly welded, or the tab 42 and the terminal assembly 50 may be connected by a metal patch, and the specific connection manner may be welding, or does not exclude the use of riveting, and the like, and is not limited herein.

It should be noted that the electric core main body 41 includes more than two pole pieces, the tab 42 includes more than two single-piece tabs, the single-piece tabs respectively extend from the corresponding pole pieces, the width of the single-piece tabs is smaller than that of the pole pieces, a plurality of single-piece tabs are stacked together to form the tab 42, and are connected with the pole assembly 50, wherein the tab 42 can be welded with the pole assembly 50. Wherein the single tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

In some embodiments, there are two pole assemblies 50, two pole assemblies 50 are a positive pole assembly and a negative pole assembly, respectively, there are two tabs 42, two tabs 42 are a positive tab and a negative tab, respectively, the positive pole assembly is connected to the positive tab, and the negative pole assembly is connected to the negative tab.

In one embodiment, the length of the cell is a,400mm a 2500mm, the width of the cell is b, the height of the cell is c,2b a 50b, and/or 0.5c b 20c.

Furthermore, b is more than or equal to 50mm and less than or equal to 200mm, and c is more than or equal to 10mm and less than or equal to 100mm.

Preferably, 4 b.ltoreq.a.ltoreq.25 b, and/or 2 c.ltoreq.b.ltoreq.10 c.

In the battery in the above embodiment, the ratio of the length to the width of the battery is large, and further, the ratio of the width to the height of the battery is large, while sufficient energy density is ensured.

In one embodiment, the length of the battery is a, the width of the battery is b, and a is greater than or equal to 4b and less than or equal to 7b, i.e., the ratio of the length to the width of the battery in the embodiment is larger, so that the energy density of the battery is increased, and the subsequent formation of the battery module is facilitated.

In one embodiment, the height of the battery is c, b is more than or equal to 3c and less than or equal to 7c, and the ratio of the width to the height of the battery is larger, so that the battery is conveniently formed under the condition of ensuring enough energy density.

Alternatively, the length of the cell may be 500mm to 1500mm, the width of the cell may be 80mm to 150mm, and the height of the cell may be 15mm to 25mm.

The length of the battery is a dimension in the battery length direction, the width of the battery is a dimension in the battery width direction, and the height of the battery is a dimension in the battery height direction, that is, the thickness of the battery.

In one embodiment, the batteries are laminated batteries, so that the batteries are convenient to pack and can be processed to obtain batteries with longer lengths.

Specifically, the battery cell 40 is a laminated battery cell, and the battery cell 40 has a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm disposed between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Optionally, the battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core.

An embodiment of the invention also provides a battery pack comprising the battery.

The battery of the battery pack according to an embodiment of the present invention includes a case 10, a first cover 20, a second cover 30, and a battery cell 40, and the battery cell 40 is mounted in a sealed accommodating cavity 11 formed by the case 10, the first cover 20, and the second cover 30. First flange 121 is provided through first welding end 12 at casing 10, and makes the big surface and the welding of second welding end 13 of first flange 121 to increased first welding end 12 and the welding area of second welding end 13, not only convenient welding, and the stability after the welding is higher.

In some embodiments, the battery pack includes at least two cells, the at least two cells being arranged in parallel.

The battery pack may be a battery module in one embodiment. The battery pack may also be a battery pack, optionally, the battery pack includes at least two batteries, and the battery pack may further include a case, where the at least two batteries are disposed in the case.

An embodiment of the present invention provides a method for manufacturing a battery, referring to fig. 9, the method for manufacturing a battery includes:

s101, providing a shell 10, wherein the shell 10 comprises an accommodating cavity 11, and the accommodating cavity 11 is provided with a first opening 111 and a second opening 112 which are opposite;

s103, providing the battery core 40, wherein the battery core 40 is located in the accommodating cavity 11;

s105, providing a first cover 20, wherein the first cover 20 is connected to one end of the housing 10 to close the first opening 111;

s107, providing a second cover 30, wherein the second cover 30 is connected to the other end of the casing 10 to close the second opening 112;

the housing 10 further includes a first welding end 12 and a second welding end 13, the first welding end 12 includes a first flange 121, two ends of the first flange 121 extend to the first opening 111 and the second opening 112 respectively, and a large surface of the first flange 121 is welded to the second welding end 13, so that the housing 10 is formed with the accommodating cavity 11.

In the battery manufacturing method according to an embodiment of the present invention, the battery cell 40 is mounted in the sealed accommodation cavity 11 formed by the case 10, the first cover 20, and the second cover 30. First flange 121 is provided through first welding end 12 at casing 10, and makes the big surface and the welding of second welding end 13 of first flange 121 to increased first welding end 12 and the welding area of second welding end 13, not only convenient welding, and the stability after the welding is higher.

It should be noted that, the housing 10, the battery cell 40, the first cover 20, and the second cover 30 are not provided in sequence. Correspondingly, the battery cell 40 may be first disposed in the accommodating cavity 11, and then the first cover body 20 and the second cover body 30 are welded, or one of the first cover body 20 and the second cover body 30 may be first welded to the casing 10, then the battery cell 40 is disposed in the accommodating cavity 11, and then the other of the first cover body 20 and the second cover body 30 is welded to the casing 10.

In one embodiment, the first welding end 12 and the second welding end 13 are welded after the flat plate is bent to form the housing 10. The case 10 is formed by bending a flat plate several times to form a rectangular structure, and welding two free ends of the flat plate, i.e., the first welding end 12 and the second welding end 13, to form the case 10.

In one embodiment, the battery manufacturing method further comprises: before bending the flat plate, mounting the pole assembly 50 on the flat plate, and placing the battery core 40 on the flat plate; connecting the battery cell 40 with the pole assembly 50; and bending the flat plate according to the shape of the battery cell 40. Utmost point post subassembly 50 direct mount is on the flat board, and not only easy operation, and it is extremely convenient to install, further obtains casing 10 through making the flat board buckle according to the shape of electric core 40 and also makes the operation extremely simple, and the chamber 11 shape that holds that finally forms is for relatively matching with electric core 40.

In one embodiment, the battery manufacturing method further comprises: before the first cover 20 is connected to the housing 10, the pole assembly 50 is mounted on the first cover 20 and connected to the battery cell 40, which is also easy to operate and difficult to mount.

Optionally, the battery manufacturing method further includes: before the second cover 30 is connected to the housing 10, the pole assembly 50 is mounted on the second cover 30 and connected to the battery cell 40.

It should be noted that both of the paired pole assemblies 50 may be mounted on the first cover 20 or the second cover 30, or the paired pole assemblies 50 may be mounted on the first cover 20 and the second cover 30, respectively. The pole assembly 50 is welded to the pole ear 42 of the battery core 40.

In one embodiment, the second welding terminal 13 includes a second flange 131, both ends of the second flange 131 respectively extend to the first opening 111 and the second opening 112, and the welding of the first flange 121 to the second welding terminal 13 includes: the first flange 121 is welded to the second flange 131, so that welding is facilitated, and welding stability can be ensured.

In one embodiment, the housing 10 includes two opposing first plates 14 and two opposing second plates 15, the second plates 15 connecting the two first plates 14; the housing 10 further includes a third flange 16, and one end of at least one of the two first boards 14 and the two second boards 15 is provided with the third flange 16; the first cover body 20 is provided with a first cover body flange 21; the interval sets up between two adjacent third flange 16 on first plate 14 and the second plate 15 to form first space 17, is provided with first arch 22 on the first lid flange 21, and first arch 22 and first space 17 looks adaptation, first lid 20 connect in casing 10 and include: the first cover body flange edge 21 is welded with the third flange edge 16; the first protrusions 22 are welded to two adjacent third flanges 16. The shell 10 and the first cover body 20 are welded through the third flange edge 16 and the first cover body flange edge 21, so that welding is convenient, welding stability is guaranteed, and the sealing performance of a welding line is guaranteed through the matching of the first protrusion 22 and the first gap 17, so that the shell 10 and the first cover body 20 are guaranteed to form a sealing structure.

Correspondingly, the housing 10 includes two opposite first boards 14 and two opposite second boards 15, and the second boards 15 connect the two first boards 14; the housing 10 further includes a fourth flange 18, and the other end of at least one of the two first boards 14 and the two second boards 15 is provided with the fourth flange 18; a second cover body flange edge 31 is arranged on the second cover body 30, and the second cover body flange edge 31 is welded with the fourth flange edge 18; wherein, interval setting between two adjacent fourth flange 18 on first plate 14 and the second plate 15 to form second space 19, be provided with the protruding 32 of second on the second lid flange 31, the protruding 32 of second and second space 19 looks adaptation, second lid 30 connects and includes in casing 10: the second cover body flange edge 31 is welded with the fourth flange edge 18; the second protrusions 32 are welded to two adjacent fourth flanges 18. The shell 10 and the second cover 30 are welded by the fourth flange 18 and the second cover flange 31, so that the welding is convenient, the welding stability is ensured, and the sealing performance of the welding seam is ensured by the matching of the second protrusion 32 and the second gap 19, so that the shell 10 and the second cover 30 form a sealing structure.

The welding may be any of laser welding, ultrasonic welding, and resistance welding. For other specific structures of the casing 10, the first cover 20, the second cover 30, and the battery cell 40, reference may be made to the structure of the battery described above, and details are not described herein.

In one embodiment, a battery manufacturing method is used to form the above-described battery.

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

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

Claims

1. A battery, comprising:

a housing (10), the housing (10) comprising a receiving cavity (11), the receiving cavity (11) having a first opening (111) and a second opening (112) opposite to each other;

a first cover (20), wherein the first cover (20) is connected to one end of the shell (10) to close the first opening (111);

a second cover (30), wherein the second cover (30) is connected to the other end of the shell (10) to close the second opening (112);

a battery cell (40), the battery cell (40) being located within the accommodation cavity (11);

the shell (10) further comprises a first welding end (12) and a second welding end (13), the first welding end (12) comprises a first flange edge (121), two ends of the first flange edge (121) respectively extend to the first opening (111) and the second opening (112), and the large surface of the first flange edge (121) is welded with the second welding end (13), so that the shell (10) is formed with the accommodating cavity (11).

2. The battery according to claim 1, wherein the second welded end (13) comprises a second flange (131), both ends of the second flange (131) extend to the first opening (111) and the second opening (112), respectively, and the first flange (121) is welded to the second flange (131).

3. The battery according to claim 1, characterized in that said case (10) comprises two opposite first plates (14) and two opposite second plates (15), said second plates (15) connecting said two first plates (14).

4. The battery according to claim 3, wherein the first weld end (12) and the second weld end (13) are located on the first plate body (14) or the second plate body (15);

or one of the first welding end (12) and the second welding end (13) is located on the first plate body (14), and the other is located on the second plate body (15).

5. The battery according to claim 3, wherein the housing (10) further comprises:

a third flange (16), wherein the third flange (16) is arranged at one end of at least one of the two first boards (14) and the two second boards (15) facing the first cover body (20);

wherein the first cover body (20) is welded with the large surface of the third flange edge (16).

6. The battery according to claim 5, wherein a first cover flange (21) is provided on the first cover (20), the first cover flange (21) being welded to the third flange (16).

7. The battery according to claim 6, wherein two adjacent third flange edges (16) on the first plate body (14) and the second plate body (15) are arranged at intervals to form a first gap (17), a first protrusion (22) is arranged on the first cover body flange edge (21), and the first protrusion (22) is matched with the first gap (17);

wherein the first bulge (22) is welded with two adjacent third flange edges (16).

8. The battery according to claim 3, characterized in that the case (10) further comprises a fourth flange (18), and the other end of at least one of the two first panels (14) and the two second panels (15) facing the second cover (30) is provided with the fourth flange (18);

a second cover body flange edge (31) is arranged on the second cover body (30), and the second cover body flange edge (31) is welded with the fourth flange edge (18);

the first plate body (14) and the second plate body (15) are arranged between the adjacent two fourth flange edges (18) at intervals to form a second gap (19), a second protrusion (32) is arranged on the second cover body flange edge (31), the second protrusion (32) is matched with the second gap (19), and the second protrusion (32) is welded with the adjacent two fourth flange edges (18).

9. The battery of claim 1, further comprising a pole assembly (50);

wherein the pole assembly (50) is arranged on the shell (10); or, the pole assembly (50) is arranged on at least one of the first cover body (20) and the second cover body (30).

10. The battery according to any one of claims 1 to 9, wherein the length of the battery is a, the width of the battery is b, the height of the battery is c,2b ≦ a ≦ 50b, and/or, 0.5c ≦ b ≦ 20c;

400mm≤a≤2500mm。

11. a battery pack characterized by comprising the battery according to any one of claims 1 to 10.

12. A method of manufacturing a battery, comprising:

providing a housing (10), wherein the housing (10) comprises a containing cavity (11), and the containing cavity (11) is provided with a first opening (111) and a second opening (112) which are opposite;

providing a battery cell (40), wherein the battery cell (40) is located in the accommodating cavity (11);

providing a first cover body (20), wherein the first cover body (20) is connected to one end of the shell body (10) to close the first opening (111);

providing a second cover body (30), wherein the second cover body (30) is connected to the other end of the shell (10) to close the second opening (112);

the shell (10) further comprises a first welding end (12) and a second welding end (13), the first welding end (12) comprises a first flange edge (121), two ends of the first flange edge (121) respectively extend to the first opening (111) and the second opening (112), and the large surface of the first flange edge (121) is welded to the second welding end (13), so that the shell (10) is formed with the accommodating cavity (11).

13. The battery manufacturing method according to claim 12, wherein the welding of the first welding terminal (12) and the second welding terminal (13) is performed after bending a flat plate to form the case (10).

14. The battery manufacturing method according to claim 13, further comprising:

prior to bending the flat plate, mounting a pole assembly (50) on the flat plate and placing the cells (40) on the flat plate;

connecting the battery core (40) with the pole assembly (50);

and bending the flat plate according to the shape of the battery core (40).

15. The battery manufacturing method according to claim 12, further comprising:

before the first cover body (20) is connected to the shell body (10),

mounting a pole post assembly (50) on the first cover body (20) and connecting the pole post assembly with the battery core (40);

or, before the second cover body (30) is connected to the shell body (10),

and installing a pole post assembly (50) on the second cover body (30) and connecting with the battery core (40).

16. The battery manufacturing method according to claim 12, wherein the second welding terminal (13) includes a second flange (131), both ends of the second flange (131) extend to the first opening (111) and the second opening (112), respectively, and the welding of the first flange (121) to the second welding terminal (13) includes:

the first flange edge (121) is welded to the second flange edge (131).

17. The battery manufacturing method according to claim 12, wherein the housing (10) comprises two opposite first plates (14) and two opposite second plates (15), the second plates (15) connecting the two first plates (14);

the shell (10) further comprises a third flange edge (16), and one end, facing the first cover body (20), of at least one of the two first plate bodies (14) and the two second plate bodies (15) is provided with the third flange edge (16);

a first cover body flange edge (21) is arranged on the first cover body (20);

the first plate body (14) and two adjacent third flange edges (16) on the second plate body (15) are arranged at intervals to form a first gap (17), a first protrusion (22) is arranged on the first cover body flange edge (21), the first protrusion (22) is matched with the first gap (17), and the first cover body (20) is connected to the shell (10) and comprises:

the first cover body flange edge (21) is welded with the third flange edge (16);

the first bulge (22) is welded with two adjacent third flange edges (16).

18. The battery manufacturing method according to claim 12, wherein the case (10) comprises two opposing first plates (14) and two opposing second plates (15), the second plates (15) connecting the two first plates (14);

the shell (10) further comprises a fourth flange edge (18), and the fourth flange edge (18) is arranged at the other end, facing the second cover body (30), of at least one of the two first plate bodies (14) and the two second plate bodies (15);

wherein, the interval sets up between two adjacent fourth flange limits (18) on first plate body (14) and second plate body (15) to form second space (19), be provided with second arch (32) on second lid flange limit (31), second arch (32) with second space (19) looks adaptation, second lid (30) connect in casing (10) include:

the second cover body flange edge (31) is welded with the fourth flange edge (18);

the second protrusions (32) are welded with the adjacent two fourth flange edges (18).