CN115020883A

CN115020883A - Battery and method for manufacturing same

Info

Publication number: CN115020883A
Application number: CN202210426351.3A
Authority: CN
Inventors: 徐永刚; 曹星宇
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-09-06

Abstract

The invention discloses a battery and a manufacturing method thereof, wherein the battery comprises: a cover plate assembly; the battery cell is positioned on the back surface of the cover plate assembly and comprises a battery cell main body and a lug extending from the battery cell main body to the direction far away from the battery cell main body, and the lug is arranged towards the cover plate assembly; the conductive piece is arranged on the cover plate component, and part of the conductive piece is exposed out of the front surface of the cover plate component; the conductive plate is positioned on the back surface of the cover plate assembly and is electrically connected with the conductive piece; the current conducting plate extends towards the pole ear and is welded with the pole ear; the cover plate assembly further comprises a plurality of supporting pieces which are arranged at intervals, and each supporting piece extends towards the direction of the cell main body and abuts against the cell main body. Because the battery includes the current conducting plate, this current conducting plate has the part to extend towards the utmost point ear is square to with utmost point ear welded connection, therefore utmost point ear need not buckle, but the current conducting plate is connected with utmost point ear after buckling, can avoid the emergence of utmost point ear interpolation phenomenon.

Description

Battery and method for manufacturing same

Technical Field

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

Background

With the rapid development of electric vehicles, research on batteries on electric vehicles is increasing and is becoming more and more widespread.

In the conventional battery, the battery cell has a tab electrically connected to the electrode on the cover plate, and the body of the battery cell is perpendicular to the cover plate. When the tab is bent relative to the main body of the battery cell, the tab may be inserted into the battery cell, and the tab is inserted into the main body of the battery cell, so that the tab is bent and then contacts with the main body of the battery cell to cause electrical connection, thereby causing short circuit of the battery.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a battery and a method of manufacturing the same, in which tabs are not inserted to cause a short circuit of the battery.

To solve the above technical problem, an embodiment of the present invention provides a battery including:

a cover plate assembly;

the battery cell is positioned on the back surface of the cover plate assembly and comprises a battery cell main body and a lug extending from the battery cell main body to the direction far away from the battery cell main body, and the lug is arranged towards the cover plate assembly;

the conductive piece is arranged on the cover plate component, and part of the conductive piece is exposed out of the front surface of the cover plate component; and

the conductive plate is positioned on the back surface of the cover plate assembly and is electrically connected with the conductive piece; the conductive plate comprises an extension part extending towards the pole lug direction, and the extension part is connected with the pole lug in a welding way;

the cover plate assembly further comprises a plurality of supporting pieces which are arranged at intervals, and each supporting piece extends towards the direction of the battery cell main body and is abutted against the battery cell main body.

Compared with the prior art, the battery comprises the conductive plate, and part of the conductive plate extends towards the square shape of the lug and is connected with the lug in a welding mode, so that the lug is not required to be bent, but the conductive plate is connected with the lug after being bent, and the phenomenon of lug interpolation can be avoided.

In addition, because the cover plate assembly further comprises a plurality of supporting pieces which are arranged at intervals, and each supporting piece is abutted to the cell main body, a certain distance can be always kept between the cover plate in the cover plate assembly and the cell main body, so that the vertical state of the lug is kept, and the flexible lug is prevented from being bent.

In one embodiment, the battery cell is a plurality of, and each battery cell is set up each other side by side, the current conducting plate includes:

the bottom plate is attached to the back surface of the cover plate assembly and is electrically connected with the conductive piece;

the extension part is a plurality of welding pieces, the welding pieces are arranged in parallel along the parallel direction of the battery cell, the welding pieces are electrically connected with the bottom plate, and the lug of the battery cell is respectively connected with the welding pieces in a welding manner.

In one embodiment, the number of the welding sheets is equal to that of the tabs, the welding sheets correspond to the tabs one by one, and each welding sheet is welded and connected with each corresponding tab;

or, if the number of the welding sheets is less than that of the tabs, part of the adjacent tabs are welded on the same welding sheet along the parallel direction of each battery cell.

In one embodiment, a plurality of partially adjacent tabs are welded on the same welding sheet, and the tabs are welded on the welding sheet after being welded into a whole.

In one embodiment, the cover plate assembly further comprises:

the cover plate is provided with a mounting hole, and the conductive piece is at least partially arranged in the mounting hole and is arranged at an interval with the hole wall of the mounting hole;

an upper plastic ring disposed on the front side of the cover plate, the upper plastic ring operatively separating the conductive member and the cover plate;

lower plastic, lower plastic set up in the apron back, lower plastic includes: the separator is arranged between the cover plate and the current conducting plate, and the support pieces extend from the separator to the direction of the cell main body and abut against the cell main body.

In an embodiment, the support member is a support pillar, wherein, in a direction perpendicular to the cover plate, an end surface of the extension portion facing the cell main body side is located inside an end surface of the support pillar facing the cell main body side.

In one embodiment, the cover plate is a rectangular strip plate, the conductive pieces and the conductive plates are arranged in a one-to-one correspondence manner, and the conductive plates are sequentially arranged along the length direction of the cover plate assembly;

the support columns are at least four, and the four support columns are respectively located at four top corners of the cover plate.

In an embodiment, the partition plate is an elongated partition plate extending along the length direction of the cover plate, and each of the conductive plates is located on the elongated partition plate;

and/or the plurality of the partition plates are arranged in sequence along the length direction of the cover plate, and the partition plates and the conductive plates are arranged in a one-to-one correspondence mode.

In an embodiment, at least one supporting column is disposed between two adjacent conductive members, and the supporting column extends along the width direction of the cover plate.

In one embodiment, the conductive member and the conductive plate are terminals of a battery; or, the conductive piece is a pole of a battery, and the conductive plate is a circuit adapter plate;

and/or the battery further comprises: the battery cell comprises a shell, a cover plate assembly and a battery body, wherein the shell is provided with an opening, the battery cell is arranged in the shell, and the cover plate assembly covers the opening;

and/or the extension part and the battery cell main body are mutually separated;

and/or, set up on the apron subassembly and annotate the liquid hole, the current conducting plate has and is located the bottom plate at the apron subassembly back, set up on the bottom plate and run through the fretwork portion of bottom plate, fretwork portion is along the perpendicular to apron subassembly direction is just right annotate the liquid hole setting.

The invention also provides a manufacturing method based on the battery, which comprises the following steps:

preparing the cover plate assembly, the battery cell, the conductive piece and the conductive plate;

disposing the conductive member and the conductive plate on the cap assembly;

abutting the lug of the battery cell against the extending part of the current-conducting plate without bending, and abutting each support piece against the main body of the battery cell;

and welding the lug on the extension part of the current-conducting plate.

In one embodiment, the specific steps of welding the tab to the extended portion of the conductive plate are as follows:

attaching a lug of the battery cell to the outer side of the extension part of the current-conducting plate, and performing laser welding or ultrasonic welding on the lug and the current-conducting plate from the outer side of the lug;

or, the electrode lug of the battery cell is attached to the inner side of the extending part of the current conducting plate, the ultrasonic welding device is provided with a welding head and a welding seat, the welding head is inserted into the space between two adjacent supporting pieces and supports against the electrode lug, the welding seat supports against the outer side of the current conducting plate, and the electrode lug is welded on the current conducting plate by the welding head and the welding seat.

In one embodiment, the tab is multiple, and the step of welding the tab to the extension portion of the conductive plate is as follows:

welding partial areas of at least two adjacent tabs in advance to form a whole;

and welding the welded tab to the extension part of the current-conducting plate.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

FIG. 1 is a schematic diagram of a battery according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the cover plate assembly after being assembled with the conductive members and the conductive plates in the embodiment of the present invention;

FIG. 3 is a structural view of a battery of an embodiment of the present invention with the housing removed;

FIG. 4 is a top view of FIG. 3;

fig. 5 is a cross-sectional view taken at a-a of fig. 4, with the tab welded to the outside of the weld tab;

FIG. 6 is an enlarged view at A in FIG. 5;

fig. 7 is a cross-sectional view taken at a-a in fig. 4, when the tab is welded to the inside of the welding tab;

FIG. 8 is an enlarged view at B in FIG. 7;

FIG. 9 is a schematic structural diagram of a lower plastic according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a conductive plate according to an embodiment of the present invention;

fig. 11 is an exploded view of a cover plate assembly, conductive members and conductive plates in an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a lower plastic in another embodiment of the invention.

Description of reference numerals:

1. a cover plate assembly; 11. a support member; 111. a first support column; 112. a second support column; 113. a third support column; 114. a fourth support column; 115. a fifth support column; 12. a cover plate; 121. mounting holes; 13. applying a plastic ring; 14. plastic is discharged; 141. a placement groove; 142. a partition plate; 143. a through hole; 144. reinforcing ribs; 15. a seal ring; 2. an electric core; 21. a cell main body; 22. a tab; 3. a conductive member; 31. a polar plate; 32. a cylinder; 33. a positive post; 34. a negative pole post; 4. a conductive plate; 41. a base plate; 411. a hollowed-out portion; 42. welding the sheet; 5. a liquid injection hole; 6. a housing.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

An embodiment battery of the present invention is described below with reference to the drawings, as shown in fig. 1 to 8, the battery including: apron subassembly 1, electric core 2, electrically conductive 3 and current conducting plate 4, electric core 2 are located the back of apron subassembly 1, and electric core 2 includes: cell main part 21 and the utmost point ear 22 that extends towards keeping away from cell main part 21 direction from cell main part 21, utmost point ear 22 sets up towards apron subassembly 1. The conductive member 3 is disposed on the cap plate assembly 1, and a portion of the conductive member 3 is exposed from the front surface of the cap plate assembly 1. The conductive plate 4 is located on the back of the cover plate assembly 1 and is electrically connected with the conductive piece 3, and part of the conductive plate 4 extends towards the tab 22 to form an extension part, and the extension part is welded with the tab 22. The cover plate assembly 1 further includes a plurality of supporting members 11 disposed at intervals, and the supporting members 11 extend toward the cell main body 21 and abut against the cell main body 21.

Because the battery comprises the conductive plate 4, part of the conductive plate 4 extends towards the direction of the tab 22 to form an extension part, and the extension part is welded with the tab 22, the tab 22 is not required to be bent, but the conductive plate 4 is connected with the tab 22 after being bent, and the phenomenon of inserting the tab 22 can be avoided.

In addition, because the cover plate assembly 1 further includes a plurality of support members 11 arranged at intervals, and each support member 11 abuts against the cell main body 21, a certain distance can be always kept between the cover plate 12 and the cell main body 21 in the cover plate assembly 1, so that the vertical state of the tab 22 is maintained, and the flexible tab 22 is prevented from being bent.

Since the supporting members 11 are spaced apart from each other, the welding gun can pass through the gaps between the supporting members 11, thereby facilitating the welding of the tab 22 to the welding piece 42.

In addition, specifically, the extension portion and the cell main body 21 are separated from each other, so that the extension portion and the cell main body 21 are prevented from being electrically connected with each other.

Specifically, as shown in fig. 4 to 8, a plurality of battery cells 2 are provided, and the battery cells 2 are arranged in parallel with each other, and in this embodiment, the battery cells 2 are arranged along the width direction of the cover plate assembly 1. And the conductive plate 4 includes: a bottom plate 41 and the above-mentioned extension part, the extension part is a plurality of welding sheets 42, the bottom plate 41 is attached to the back surface of the cover plate assembly 1, and the bottom plate 41 is electrically connected with the conductive member 3. The welding pieces 42 are arranged in parallel with each other along the parallel direction of the battery cells 2, the welding pieces 42 are electrically connected to the base plate 41, and the tabs 22 of the battery cells 2 are welded to the welding pieces 42.

In some embodiments, the number of welding tabs 42 is equal to the number of tabs 22, and each welding tab 42 is welded to the corresponding tab 22. As shown in fig. 3, in the present embodiment, there are two battery cells 2, and there are also two welding sheets 42, in the present embodiment, the battery cells 2 are disposed substantially perpendicular to the cover plate assembly 1, and it should be noted that, in some embodiments, the battery cells 2 may also be disposed directly perpendicular to the cover plate assembly 1. Correspondingly, the welding tabs 42 are also disposed substantially perpendicularly to the base plate 41, and the base plate 41 is disposed parallel to the cover plate assembly 1.

Preferably, as shown in fig. 5 and 6, in order to facilitate welding of the tab 22 and the welding piece 42, the tab 22 is disposed on the outer side of the welding piece 42, so that the tab 22 on the outer side can be welded with the tab 22 by irradiating the laser to the welding piece 42, although in some embodiments, the tab 22 may be located on the inner side of the welding piece 42 as shown in fig. 7 to 8.

In the present embodiment, only two cases of the battery cells 2 are shown, and in some embodiments, there may be a plurality of battery cells 2 without departing from the scope of the present invention.

Of course, it should be noted that, in some embodiments, the number of the welding sheets 42 may be less than that of the tabs 22, and because the number of the welding sheets 42 is less, a plurality of partially adjacent tabs 22 are welded to the same welding sheet 42 along the parallel direction of the battery cell 2. Of course, the plurality of tabs 22 may be welded to the welding piece 42 one by one, or a plurality of adjacent tabs 22 may be welded to the same welding piece 42.

Specifically, the number of the electric cores 2 is four, the four electric cores 2 are arranged along the width direction of the cover plate assembly 1, two adjacent tabs 22 in the four electric cores 2 are welded together first and then welded to one welding sheet 42, and two tabs 22 of the other two electric cores 2 are welded together and then welded to the welding sheet 42. Of course, the embodiment only shows the case that the number of the battery cells 2 is four, and in some embodiments, there may be a plurality of battery cells 2 as long as the invention does not depart from the scope of the present invention.

In addition, as shown in fig. 11, the cap plate assembly 1 includes: the cover plate 12 is provided with a mounting hole 121, the conductive member 3 is at least partially disposed in the mounting hole 121, and the conductive member 3 and the wall of the mounting hole 121 are spaced from each other. An upper plastic ring 13 is disposed on the front surface of the cover plate 12, and the upper plastic ring 13 can separate the conductive member 3 from the cover plate 12. The lower plastic 14 is disposed on the back of the cover plate 12, and the lower plastic 14 includes: the separator 142, the support members 11, and the separator 142 are disposed between the cover plate 12 and the conductive plate 4, so that the cover plate 12 and the conductive plate 4 can be separated from each other, and the support members 11 extend from the separator 142 toward the cell main body 21 and abut against the cell main bodies 21. The distance between the cover plate 12 and the cell main body 21 can be maintained by the support members 11, so that the flexible tab 22 is prevented from being bent down.

Specifically, as shown in fig. 3, 9 and 11, the support member 11 is a support column, and an end surface of the extension portion facing to the cell main body 21 is located inside an end surface of the support column facing to the cell main body 21 along a direction perpendicular to the cover plate 12. That is, the length of the extension portion is shorter than the length of the support column, so that the extension portion does not touch the cell main body 21, and thus a short circuit between the extension portion and the cell main body 21 can be avoided.

In addition, as shown in the figure, the cover plate 12 is a rectangular strip plate, the conductive members 3 and the conductive plates 4 are all provided in a plurality and are arranged in a one-to-one correspondence manner, and the conductive plates 4 are sequentially arranged along the length direction of the cover plate 12 assembly 1. As shown in the figure, there are at least four support columns, and the four support columns are respectively located at four top corners of the cover plate 12. By adopting the above mode, the cover plate 12 and the battery cell main body 21 can be stably and mutually separated, and the welding device for welding the tab 22 also conveniently extends into the two adjacent support columns, so that the convenience for welding the tab 22 is improved.

In addition, in order to further improve the stability of the support, at least one support column is also disposed between two adjacent conductive members 3, and the support column extends along the width direction of the cover plate 12, specifically, in this embodiment, two support columns are disposed between two adjacent conductive members 3, and the two support columns extend along the width direction of the cover plate 12, but of course, in some embodiments, only one support column may be provided.

As shown in the figure, in the present embodiment, the plurality of partition plates 142 are sequentially arranged along the length direction of the cover plate 12, and each partition plate 142 and each conductive plate 4 are correspondingly arranged. Specifically, in this embodiment, because the number of the conductive members is two, both the partition plate and the conductive plate are two, each partition plate 142 is provided with a plurality of support pillars, each support pillar surrounds the center of the partition plate 142, and the conductive plate 4 is located between the support pillars. In this embodiment, as shown in fig. 9, the partition 142 is a rectangular plate, and the number of the supporting columns is three, the three supporting columns are respectively a first supporting column 111, a second supporting column 112 and a third supporting column 113, the first supporting column 111 and the second supporting column 112 are oppositely disposed along the width direction of the cover plate 12, and the first supporting column 111 and the second supporting column 112 are respectively disposed opposite to two top corners of the partition 142. The third supporting columns 113 are elongated columns 32 extending along the width direction of the cover plate 12, and the third supporting columns 113 are disposed opposite to the first supporting columns 111 and the second supporting columns 112 along the length direction of the case.

Because the first supporting column 111 and the second supporting column 112 are arranged in a mutually isolated manner, the welding gun can penetrate through the first supporting column 111 and the second supporting column 112, and the tab 22 can be conveniently welded on the welding sheet 42.

Of course, it should be noted that there may be four support columns, and the four support columns are respectively disposed opposite to the four top corners of the partition 142. Meanwhile, the number and the arrangement positions of the supporting columns can be not only the scheme listed above, but also other schemes as long as the invention is not departed from the scope of the invention.

Preferably, the support post is a hollow post, but to increase the strength of the support post, a reinforcing rib 144 is provided in the support post.

Of course, in some embodiments, as shown in fig. 12, the partition 142 may also be an elongated partition 142, the elongated partition 142 extends along the length direction of the cover 12 and is parallel to the cover 12, the conductive plates 4 are located on the elongated partition 142, and the conductive plates 4 are arranged at intervals along the length direction of the partition 142. And a supporting column is also arranged between two connected conductive plates 4, and the supporting column is located on the elongated partition plate 142.

For example, as shown in fig. 12, four fourth supporting columns 114 are respectively disposed at four top corners of the elongated partition 142, one fifth supporting column 115 is disposed in the middle of the elongated partition 142, and the fifth supporting column 115 has a placement groove 141. As shown in fig. 11, the cover plate 12 is a strip-shaped cover plate 12, two conductive members 3, two sealing rings 15, two upper plastic rings 13, two lower plastic rings 14 and two conductive plates 4 are provided, the two conductive members 3 are a positive pole 33 and a negative pole 34, respectively, and the positive pole 33 and the negative pole 34 are arranged along the length direction of the cover plate 12. In addition, as shown in fig. 11, two third supporting columns 113 of the two lower plastics 14 are closely arranged with each other, and the side of the two third supporting columns 113 facing the cover plate 12 is provided with a placing groove 141, and the placing groove 141 is operable to place the explosion-proof valve of the battery.

In addition, as shown in fig. 11, in the present embodiment, the conductive member 3 and the conductive plate 4 are combined to form a battery post, so that the tab 22 is directly welded to the post, and thus an adaptor plate may be eliminated.

Specifically, as shown in fig. 11, the conductive device 3 includes: the pole plate 31 and the column 32, the column 32 is arranged substantially perpendicular to the pole plate 31, the pole plate 31 is arranged on the front surface of the cover plate 12, and the column 32 is arranged in the mounting hole 121. The upper plastic ring 13 is sleeved on the column 32 and located between the pole plate 31 and the cover plate 12 to separate the pole plate 31 and the cover plate 12. The cover plate assembly 1 further comprises a sealing ring 15 sleeved outside the column body 32, and the sealing ring 15 is used for sealing a gap between the hole wall of the mounting hole 121 and the column body 32. In addition, the lower plastic 14 also has a through hole 143, the through hole 143 is coaxially disposed with the mounting hole 121 of the cover plate 12, the column 32 is located in the through hole 143 and the mounting hole 121, and the conductive plate 4 is located on the back of the lower plastic 14 and fixedly connected to the column 32.

As shown in fig. 10 and 11, since the welding pieces 42 are two pieces, and the two welding pieces 42 are oppositely disposed on both sides of the bottom plate 41 in the width direction of the cover plate 12, the point at which the column 32 is connected to the bottom plate 41 is located between the two welding pieces 42.

Of course, in some embodiments, the conductive member 3 may be a post of a battery, and the conductive plate 4 may be a circuit adapter plate electrically connected to the post.

As shown in fig. 11, the cover plate assembly 1 is provided with a liquid injection hole 5, the bottom plate 41 is provided with a hollow portion 411 penetrating through the bottom plate 41, and the hollow portion 411 is disposed opposite to the liquid injection hole 5 in a direction perpendicular to the cover plate assembly 1. The hollow-out part 411 is a notch formed on the bottom plate 41; or the hollow portion 411 is a through hole 143 formed in the bottom plate 41.

In addition, as shown in fig. 1, the battery further includes a casing 6, the casing 6 has an opening, the electric core 2 is disposed in the casing 6, the cover plate assembly 1 covers the opening, and a cover plate 12 in the cover plate assembly 1 is welded to the casing 6.

A second embodiment of the invention provides a method of manufacturing a battery, which is employed for manufacturing the battery in the above-described embodiments. Specifically, as shown in fig. 1 to 11, the manufacturing method includes the steps of: preparing the cover plate assembly 1, the battery core 2, the conductive piece 3 and the conductive plate 4 in the embodiment; arranging the conductive member 3 and the conductive plate 4 on the cap assembly 1; the tab 22 of the battery cell 2 is abutted to the extending part of the current conducting plate 4 without bending, and each supporting piece 11 abuts to the battery cell main body 21 of the battery cell 2; the tab 22 is welded to the extension of the conductive plate 4.

Because the battery comprises the conductive plate 4, part of the conductive plate 4 extends towards the square of the tab 22 and is welded with the tab 22, the tab 22 is not bent, but the conductive plate 4 is connected with the tab 22 after being bent, and the phenomenon of inserting the tab 22 can be avoided.

Specifically, the specific steps of welding the tab 22 to the extended portion of the conductive plate 4 are as follows: the tab 22 of the battery cell 2 is attached to the outer side of the extension part of the current-conducting plate 4, that is, attached to the outer side of the welding sheet 42, and the tab 22 and the current-conducting plate 4 are welded together by laser welding or ultrasonic welding from the outer side of the tab 22.

Of course, in some embodiments, the tab 22 of the battery cell 2 may be attached to the inner side of the conductive plate 4, that is, to the inner side of the welding sheet 42, and then the tab 22 may be welded to the welding sheet 42 by ultrasonic welding. Specifically, the ultrasonic welding device has a welding head and a welding seat, and after the tab 22 is attached to the welding piece 42, the welding head is first inserted between two adjacent supporting members 11 to hold the tab 22. The soldering nest is held against the outside of the conductive plate 4 and the soldering head and soldering nest are opened to solder the tab 22 to the soldering tab 42 of the conductive plate.

In addition, when there are a plurality of tabs 22, for example, when the number of tabs 22 is greater than the number of adaptor pieces, in the specific step of welding the tabs 22 to the extension portion of the conductive plate 4, at least two adjacent tabs 22 are welded together in advance, specifically, at least two adjacent tabs 22 may be welded together in an ultrasonic welding manner, and then the tabs 22 formed into one piece are welded to the extension portion of the conductive plate 4, that is, to the welding pieces 42.

After the welding of the tabs 22 is completed, the battery cell 2 is placed in the casing 6, and the cover plate 12 is welded to the casing 6.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

It should be noted that the technical solutions and the related details mentioned in one embodiment can be applied to other embodiments, and are not described in detail in each embodiment to avoid repetition.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A battery, comprising:

a cover plate assembly;

the conductive plate is positioned on the back surface of the cover plate assembly and is electrically connected with the conductive piece; the conductive plate comprises an extension part extending towards the direction of the tab, and the extension part is connected with the tab in a welding mode;

2. The battery of claim 1, wherein the battery cell is a plurality of battery cells, each of the battery cells is disposed in parallel with each other, and the conductive plate includes:

3. The battery of claim 2, wherein the number of the welding sheets is equal to that of the tabs, and the welding sheets correspond to the tabs one by one, and each welding sheet is welded and connected with each corresponding tab;

or, if the number of the welding sheets is less than that of the tabs, a plurality of partially adjacent tabs are welded on the same welding sheet along the parallel direction of the battery cells.

4. The battery of claim 3, wherein a plurality of partially adjacent tabs are welded to the same tab, and the tabs are welded to the tab after being welded integrally.

5. The battery of claim 1, wherein the cover plate assembly further comprises:

6. The battery of claim 5, wherein the support member is a support pillar, and wherein an end surface of the extension portion facing the cell body side is located inward of an end surface of the support pillar facing the cell body side in a direction perpendicular to the cover plate.

7. The battery of claim 6, wherein the cover plate is an elongated rectangular plate, the plurality of conductive pieces and the plurality of conductive plates are arranged in a one-to-one correspondence, and the conductive plates are sequentially arranged along the length direction of the cover plate assembly;

8. The battery of claim 7, wherein the separator is an elongated separator extending along the length of the cover plate, and each of the conductive plates is located on the elongated separator;

9. The battery of claim 7, wherein at least one supporting column is disposed between two adjacent conductive members, and the supporting column extends along the width direction of the cover plate.

10. The battery of claim 1, wherein the conductive member and the conductive plate are battery terminals; or, the conductive piece is a pole of a battery, and the conductive plate is a circuit adapter plate;

11. A method for manufacturing a battery according to any one of claims 1 to 10, comprising:

disposing the conductive member and the conductive plate on the cap assembly;

the lug of the battery cell is abutted to the extending part of the current-conducting plate without bending, and each supporting piece abuts to the battery cell main body of the battery cell;

and welding the lug on the extension part of the current conducting plate.

12. The method for manufacturing a battery according to claim 11, wherein the step of welding the tab to the extended portion of the conductive plate is as follows:

attaching a tab of the battery cell to the outer side of the extension part, and performing laser welding or ultrasonic welding on the tab and the extension part from the outer side of the tab;

or, the electrode lug of the battery cell is attached to the inner side of the current conducting plate, the ultrasonic welding device is provided with a welding head and a welding seat, the welding head is inserted into the space between two adjacent supporting pieces to support the electrode lug, the welding seat supports the outer side of the current conducting plate, and the electrode lug is welded on the current conducting plate by the welding head and the welding seat.

13. The method for manufacturing a battery according to claim 11, wherein the tab is plural, and the step of welding the tab to the extended portion of the conductive plate is as follows:

welding partial areas of at least two adjacent tabs in advance to form a whole;