CN217719893U - Battery with a battery cell - Google Patents

Abstract

The utility model relates to a battery technology field provides a battery, including electric core, electric core includes electric core main part and utmost point ear, and utmost point ear is extended by electric core main part, and utmost point ear welds the seal including first welding seal and second, and the second welds the seal and covers first welding seal, and first welding seal includes first welding seal section and second welding seal section, and first welding seal section and second weld and form the overlap region between the seal section to improve the structural strength of utmost point ear. When utmost point ear and apron subassembly welding, can carry out a lot of welding to utmost point ear to can control the welding energy better, prevent to lead to the fact the damage to utmost point ear, improve welding quality with this, thereby improve the performance of battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery technology field especially relates to a battery.

Background

In the correlation technique, the cover plate component is connected with the tab of the battery core, the connection of the tab and the cover plate component is realized directly by welding, and the tab is damaged or has poor welding quality when being welded due to the limitation of the structure of the tab, so that the connection reliability is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery cover plate subassembly and battery to improve the performance of battery.

The utility model provides a battery, including electric core, electric core includes electric core main part and utmost point ear, and utmost point ear is extended by electric core main part, and utmost point ear welds the seal including first welding seal and second, and the second welds the seal and covers first welding seal, and first welding seal includes first welding seal section and second welding seal section, and first welding seal section and second weld and form the overlap region between the seal section.

The utility model discloses the battery includes electric core, and electric core includes electric core main part and the utmost point ear that extends out by electric core main part, welds the seal through being formed with first welding on utmost point ear and second, and the second welds the seal and covers first welding seal, and the first welding seal section of first welding seal and second weld the overlap region that seal section overlap setting and form and can improve the structural strength of utmost point ear. When utmost point ear and apron subassembly welding promptly, can carry out a lot of welding to utmost point ear to can control welding energy better, prevent to lead to the fact the damage to utmost point ear, improve welding quality with this, thereby improve the performance of battery.

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 view of a tab of a battery according to an exemplary embodiment;

FIG. 2 is a schematic illustration of a partial structure of a battery according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a partial structure of a battery according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a partial structure of a battery according to another exemplary embodiment;

fig. 5 is a partial structural schematic view of a battery pack according to an exemplary embodiment.

The reference numerals are explained below:

1. a battery case; 2. a battery module; 10. an electric core; 11. a cell main body; 12. a tab; 121. first welding and printing; 1211. a first solder printing section; 1212. a second solder printing section; 1213. an overlap region; 122. second welding and printing; 1221. a third solder printing section; 1222. a fourth solder printing section; 20. a cover plate; 30. a pole assembly; 40. a patch panel; 41. a fusing part; 50. a housing member.

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, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

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 should 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 utility model provides a battery, please refer to fig. 1 to 4, the battery includes electric core 10, electric core 10 includes electric core main part 11 and utmost point ear 12, utmost point ear 12 extends out by electric core main part 11, utmost point ear 12 includes first seal 121 and second seal 122, second seal 122 covers first seal 121, first seal 121 includes first seal 1211 and second seal 1212, form overlap area 1213 between first seal 1211 and the second seal 1212.

The battery of an embodiment of the present invention includes an electric core 10, the electric core 10 includes an electric core main body 11 and a tab 12 extending from the electric core main body 11, and through forming a first welding stamp 121 and a second welding stamp 122 on the tab 12, the second welding stamp 122 covers the first welding stamp 121, and the first welding stamp 1211 and the second welding stamp 1212 of the first welding stamp 121 overlap and set up and the overlap area 1213 formed can improve the structural strength of the tab 12. When the tab 12 is welded with the cover plate assembly, the tab 12 can be welded for many times, so that the welding energy can be better controlled, the tab 12 is prevented from being damaged, the welding quality is improved, and the service performance of the battery is improved.

Note that, the second pad 122 covers the first pad 121, that is, when the first pad 121 is formed by the first bonding and then the second bonding is performed, the second pad 122 may be formed on the first pad 121 by performing the second bonding in the region of the first pad 121. The second solder mark 122 overlapping the first solder mark 121 may be considered that an orthographic projection of the second solder mark 122 is located within the first solder mark 121, and the second solder mark 122 may partially overlap the first solder mark 121.

An overlap region 1213 is formed between the first and second footprint sections 1211 and 1212 of the first footprint 121, that is, the second footprint section 1212 may be considered to be formed after the first footprint section 1211 is formed, and a portion of the second footprint section 1212 may be overlapped with the first footprint section 1211, thereby forming the overlap region 1213. The formation of the overlap region 1213 may ensure the structural strength of the tab 12, so that excessive damage to the tab 12 may not occur even if the energy is relatively large when the second welding mark 122 is subsequently formed, thereby ensuring the structural stability of the tab 12.

In the case of limited space, an overlap area 1213 is formed between the first and second solder sections 1211 and 1212, which can prevent the solder from breaking at the solder boundary, and the overlap area 1213 saves more space, and the tab 12 does not need to be too long, thereby preventing the risk of wrinkles and tape breakage.

In some embodiments, the second solder print 122 may coincide with the overlap region 1213.

In one embodiment, the second solder mark 122 does not coincide with the overlapping area 1213, so that structural damage to the overlapping area 1213 caused by the second solder mark 122 can be avoided, after all, the overlapping area 1213 has been welded twice, and the structure is relatively stable, and the structural strength of the tab 12 can be further improved by coinciding the second solder mark 122 with the portion of the first solder mark 121 outside the overlapping area 1213.

In one embodiment, as shown in fig. 1, the second welding stamp 122 includes a third welding stamp segment 1221 and a fourth welding stamp segment 1222, and the third welding stamp segment 1221 and the fourth welding stamp segment 1222 cover the first welding stamp segment 1211 and the second welding stamp segment 1212, respectively, so as to ensure that the tab 12 has a sufficient contact area with the cover plate assembly, thereby improving the connection capability between the tab 12 and the cover plate assembly.

In one embodiment, the area of the third solder mark section 1221 is larger than the area of the overlap region 1213, the area of the fourth solder mark section 1222 is larger than the area of the overlap region 1213, i.e. the area of the overlap region 1213 is not too large, so that it is possible to avoid taking too much soldering time and also to avoid damage to the overlap region 1213 when the third solder mark section 1221 and the fourth solder mark section 1222 are formed subsequently, and the third solder mark section 1221 and the fourth solder mark section 1222 having relatively large areas can improve the connection capability between the tab 12 and the cover plate assembly.

In one embodiment, the distance between the second solder mark 122 and the overlapping area 1213 is 0.5mm to 3mm, which not only can avoid the damage of the overlapping area 1213 caused by the welding energy during the formation of the second solder mark 122, but also can ensure that the second solder mark 122 can have a relatively large overlapping area with the first solder mark 121, thereby ensuring the connection strength between the tab 12 and the cover plate assembly.

Further, the distance between the second solder mark 122 and the overlap area 1213 is 1mm to 2mm.

In some embodiments, the distance between the second solder print 122 and the overlap area 1213 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, and so forth.

The distance between the third solder segment 1221 and the overlap area 1213 is 0.5mm to 3mm, and the distance between the fourth solder segment 1222 and the overlap area 1213 is 0.5mm to 3mm. Further, the distance between the third solder segment 1221 and the overlap area 1213 is 1mm to 2mm, and the distance between the fourth solder segment 1222 and the overlap area 1213 is 1mm to 2mm.

In one embodiment, the area of the third welding section 1221 occupies 10% to 50% of the area of the first welding section 1211, and on the basis of ensuring the structural strength of the tab 12, the third welding section 1221 is prevented from being too large to affect the welding efficiency, and the tab 12 is prevented from being damaged.

The area of the third solder section 1221 may be a, the area of the first solder section 1211 may be b, a/b may be 10%, 12%, 15%, 16%, 20%, 22%, 23%, 25%, 26%, 27%, 29%, 30%, 35%, 38%, 40%, 45%, 46%, 47%, 49%, or 50%, and so on.

The area of the fourth solder printing section 1222 occupies 10% -50% of the area of the second solder printing section 1212, so that on the basis of ensuring the structural strength of the tab 12, the problem that the welding efficiency is affected due to the fact that the fourth solder printing section 1222 is too large can be avoided, and the tab 12 is prevented from being damaged.

The fourth solder segment 1222 may have an area of c, the second solder segment 1212 may have an area of d, and c/d may be 10%, 12%, 15%, 16%, 20%, 22%, 23%, 25%, 26%, 27%, 29%, 30%, 35%, 38%, 40%, 45%, 46%, 47%, 49%, or 50%, etc.

The area of the second welding print 122 occupies 10% -50% of the area of the first welding print 121, so that the tab 12 is guaranteed to have reliable connection strength, and the size of the second welding print 122 is also guaranteed to be reasonable, so that the welding efficiency is improved.

The area of the second solder mark 122 may be e, the area of the first solder mark 121 may be f, and e/f may be 10%, 12%, 15%, 16%, 20%, 22%, 23%, 25%, 26%, 27%, 29%, 30%, 35%, 38%, 40%, 45%, 46%, 47%, 49%, or 50%, and so on.

In one embodiment, the area of the third solder segment 1221 is 40mm²-400mm²Therefore, the connection strength of the tab 12 is ensured, and the tab 12 can be prevented from being damaged due to the overlarge area of the third welding section 1221.

The area of the third solder printing section 1221 may be 40mm²、50mm²、55mm²、60mm²、70mm²、75mm²、80mm²、90mm²、100mm²、120mm²、150mm²、155mm²、165mm²、170mm²、175mm²、180mm²、185mm²、190mm²、195mm²、199mm²、200mm²、255mm²、300mm²、350mm²、380mm²、390mm²、395mm²、399mm²Or 400mm²And so on.

The fourth solder printing section 1222 has an area of 40mm²-400mm². The fourth solder segment 1222 may have an area of 40mm²、50mm²、55mm²、60mm²、70mm²、75mm²、80mm²、90mm²、100mm²、120mm²、150mm²、155mm²、165mm²、170mm²、175mm²、180mm²、185mm²、190mm²、195mm²、199mm²、200mm²、255mm²、300mm²、350mm²、380mm²、390mm²、395mm²、399mm²Or 400mm²And so on.

In one embodiment, the first solder print 121 has an area of 80mm²-800mm²Thereby ensuring the connection strength of the tab 12.

The area of the first solder print 121 may be 80mm²、90mm²、95mm²、100mm²、120mm²、150mm²、155mm²、165mm²、170mm²、175mm²、180mm²、185mm²、190mm²、195mm²、199mm²、200mm²、255mm²、300mm²、350mm²、380mm²、390mm²、395mm²、399mm²、400mm²、420mm²、450mm²、485mm²、500mm²、550mm²、600mm²、650mm²、685mm²、700mm²、755mm²、780mm²、799mm²Or 800mm²And so on.

In one embodiment, the second welding impressions 122 are all located within the first welding impressions 121, i.e., damage to the tab 12 is minimally avoided. It should be noted that the second welding impressions 122 are all located in the first welding impressions 121, that is, after the first welding impressions 121 are formed, a second welding needs to be performed, and a welding area that needs to be aligned with the second welding needs to be located in the first welding impressions 121, which mainly represent the welding area of the tab 12, and regardless of the welding area of the cover plate assembly, that is, taking the tab 12 as a welding reference, the second welding impressions 122 may be formed when the tab 12 and the cover plate assembly are welded.

In one embodiment, the second welding mark 122 is located in the middle of the first welding mark 121, so that the tab 12 is not damaged during the second welding, and the welding stability of the tab 12 and the cover plate assembly can be ensured.

It should be noted that the central portion is not particularly specified as the central position, but is relative to the circumferential outer edge of the first solder mark 121, that is, the second solder mark 122 does not intersect with the circumferential outer edge of the first solder mark 121, and then the second solder mark 122 is located in the central portion of the first solder mark 121.

In one embodiment, the second solder stamp 122 is located at a central position of the first solder stamp 121.

In one embodiment, the first footprint 121 may be polygonal, such as rectangular. The second pad 122 may have a polygonal shape, such as a rectangular shape, and further, the third pad segment 1221 and the fourth pad segment 1222 may have a rectangular shape. In some embodiments, it is not excluded that the first pad 121 may have an arc shape, and correspondingly, the second pad 122 may have an arc shape, for example, the third pad segment 1221 and the fourth pad segment 1222 may have an arc shape.

In one embodiment, the first welding print 121 occupies at least a portion of the tab 12, and the first welding print 121 is formed by pre-welding the tab 12, i.e., the tab 12 is pre-treated by welding before the tab 12 is connected to the cover plate assembly, so that a plurality of single tabs forming the tab 12 are reliably connected.

In one embodiment, the tab 12 includes a plurality of single tabs, the first welding print 121 is formed by pre-welding the tab 12 to combine the plurality of single tabs, the first welding print 121 may be formed by directly pre-welding the tab 12, that is, the tab 12 is pre-welded before the tab 12 is welded to the cover plate assembly, so that more than 2 single tabs of the tab 12 are combined together, the structural strength of the tab 12 is improved to a certain extent, that is, all the single tabs in the tab 12 are combined together, the strength of the tab 12 is higher, so that when the tab 12 is welded to the cover plate assembly, even though the welding energy is relatively large, due to the existence of the first welding print 121, and the second welding print 122 is performed on the basis of the first welding print 121, the first welding print 121 enhances the strength of the tab 12, so that the probability of damage to the tab 12 is greatly reduced during the second welding.

The single tab may be a metal sheet, the metal sheet is a metal sheet, and the metal sheet may be a part of the current collector, or may have other options, which is not specifically limited herein.

In one embodiment, the first welding impression 121 and the second welding impression 122 are formed sequentially, that is, in the process of forming the second welding impression 122, since welding is performed in the first welding impression 121, even though welding energy is relatively large, since the first welding impression 121 enhances the strength of the tab 12, damage to the tab 12 is prevented.

In one embodiment, both the first weld impression 121 and the second weld impression 122 are laser weld impressions; alternatively, both the first pad 121 and the second pad 122 are ultrasonic pads.

In one embodiment, the first welding stamp 121 and the second welding stamp 122 are formed by different welding methods, and the tab includes a single tab, which may be a thin metal sheet, and the thin metal sheet is pre-welded first by the welding method, that is, a stable connection is formed between adjacent metal sheets, so that the strength of the tab 12 is enhanced, and the tab 12 is prevented from being damaged. And then the tab 12 and the cover plate assembly are welded in a welding mode, so that the connection strength of the tab 12 and the cover plate assembly is enhanced, and meanwhile, the damage to the tab 12 is avoided. Different welding modes can be different in welding energy type, or the welding energy types are the same but different in strength.

The first solder print 121 is an ultrasonic solder print, and the second solder print 122 is a laser solder print; alternatively, the first solder print 121 is a laser solder print, and the second solder print 122 is an ultrasonic solder print.

Specifically, the first welding forms the first welding mark 121, the second welding forms the second welding mark 122, and the first welding mode may be any one of ultrasonic welding and laser welding. Correspondingly, the second welding mode can adopt any one of ultrasonic welding and laser welding, so long as the stability of connection can be ensured, and the tab 12 cannot be damaged during the first welding.

In one embodiment, the first solder print 121 is an ultrasonic solder print and the second solder print 122 is a laser solder print. First welding has formed first welding seal 121, and the second welding has formed second welding seal 122, and ultrasonic bonding is adopted to the first welding mode, combines each other through the ultrasonic action between a plurality of foil of utmost point ear 12 and becomes a whole, can think that a plurality of foil form becomes integrative, becomes a metal sheet that thickness is thicker, has strengthened the intensity of utmost point ear 12, has avoided the damage of utmost point ear. Correspondingly, the second welding mode adopts laser welding, forms second welding seal 122 on first welding seal 121, welds the metal sheet that apron subassembly and first welding formed, through the effect of laser for the metal sheet that first welding formed and apron subassembly fixed connection together, the intensity of the connection of reinforcing.

In one embodiment, the battery further includes a cover plate assembly, and the second welding mark 122 is formed by welding the tab 12 and the cover plate assembly to connect the tab 12 and the cover plate assembly, so that the cover plate assembly serves as an electrode lead-out terminal of the battery cell 10.

The cover plate assembly may include a cover plate 20 and a pole assembly 30, the pole assembly 30 is disposed on the cover plate 20, and the tab 12 may be electrically connected to the pole assembly 30. Alternatively, the cover plate assembly may include a cover plate 20 and the tab 12 may be electrically connected to the cover plate 20.

In one embodiment, as shown in fig. 2 and 3, the cover plate assembly includes a cover plate 20 and a pole post assembly 30, the pole post assembly 30 is disposed on the cover plate 20, the second welding stamp 122 is formed by welding the tab 12 and the pole post assembly 30 to connect the tab 12 and the pole post assembly 30, and due to the existence of the first welding stamp 121, the subsequently formed second welding stamp 122 can not only avoid damaging the tab 12, but also can ensure the connection stability of the tab 12 and the pole post assembly 30, thereby improving the welding quality of the tab 12 and the pole post assembly 30.

The pole assembly 30 can be directly welded with the pole ear 12, so that an adapter sheet in the related technology is omitted, the material cost is reduced, and the process is simplified.

In one embodiment, as shown in fig. 2 and 4, the cover plate assembly includes a cover plate 20, a pole assembly 30 and an adaptor plate 40, the pole assembly 30 is disposed on the cover plate 20, the adaptor plate 40 is connected to the pole assembly 30, the second welding stamp 122 is formed by welding the pole tab 12 and the adaptor plate 40, so as to connect the pole tab 12 and the adaptor plate 40, the pole tab 12 is electrically connected to the pole assembly 30 through the adaptor plate 40, which not only facilitates the position arrangement of the pole assembly 30, but also facilitates the adaptor plate 40 to connect the pole tab 12 and the pole assembly 30.

The first portion of the interposer 40 is connected to the pole assembly 30 and the second portion of the interposer 40 is connected to the tab 12, wherein the first portion and the second portion may not coincide, so that the first portion of the interposer 40 and the pole assembly 30 may be welded or riveted, and the second portion of the interposer 40 and the tab 12 are welded to form the second weld 122. The interposer 40 can be welded to the post assembly 30 and the tab 12 at the same time, i.e., the interposer 40 can form the second weld mark 122 when welded to the post assembly 30 and the tab 12 at the same time.

In one embodiment, as shown in fig. 4, the interposer 40 includes a fusing part 41, so that after the current reaches a certain value, the interposer 40 can be disconnected from the position of the fusing part 41, thereby causing the electrical connection of the tab 12 and the interposer 40 to be disconnected. The fusing part 41 may be a through hole.

The tab 40 includes the fusing part 41, so that the space of the tab 40 for connecting the tab 12 and the pole assembly 30 becomes smaller, and the welding area of the tab 40 and the tab 12 determines the overcurrent capacity of the battery, in this embodiment, the first welding mark 121 and the second welding mark 122 are formed in sequence, and the second welding mark 122 is formed on the first welding mark 121, and the overlapping region 1213 is formed between the first welding mark 1211 and the second welding mark 1212, so that the stable connection is formed in the limited space, thereby ensuring the overcurrent capacity of the battery.

The battery includes a cell 10 and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell 10 refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first and second electrodes may be interchanged. The battery further includes a housing member 50, and the cover plate assembly is connected to the housing member 50, thereby achieving reliable sealing of the battery cell 10. The number of the cover assemblies may be two, the two cover assemblies are respectively disposed at two opposite ends of the housing member 50, and the two pole assemblies 30 may be respectively disposed on the two cover plates 20. In some embodiments, there may be one cover plate assembly, the cover plate assembly is disposed on the shell member 50, and two pole assemblies 30 may be disposed on one cover plate 20 at the same time.

The battery cell 10 includes two tabs 12, where the two tabs are a positive tab and a negative tab, respectively, and any one of the positive tab and the negative tab may be formed with a first welding print 121 and a second welding print 122. The positive and negative electrode tabs may be connected to the pole assembly 30 through the corresponding adaptor sheet 40, and the adaptor sheet 40 connected to the positive or negative electrode tab may include a fusing part 41.

The cell 10 may be a laminated cell, which is convenient for assembly and can be processed into a battery with a long length, the cell 10 has a first pole piece, a second pole piece opposite to the first pole piece, and a diaphragm piece disposed between the first pole piece and the second pole piece, which are stacked on each other, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated cell.

The battery cell 10 may also be a winding battery cell, that is, a first pole piece, a second pole piece having an opposite electrical property to the first pole piece, and a diaphragm piece disposed between the first pole piece and the second pole piece are wound to obtain the winding battery cell.

An embodiment of the utility model also provides a battery pack, including foretell battery.

The utility model discloses a group battery of an embodiment includes the battery, and the battery includes electric core 10, and electric core 10 includes electric core main part 11 and the utmost point ear 12 that extends out by electric core main part 11, through be formed with first welding impression 121 and second welding impression 122 on utmost point ear 12, and second welding impression 122 covers first welding impression 121, and first welding impression 1211 and the second welding impression section 1212 of first welding impression 121 overlap the setting and overlap the district 1213 that forms can improve utmost point ear 12's structural strength. When the tab 12 is welded with the cover plate assembly, the tab 12 can be welded for many times, so that the welding energy can be better controlled, the tab 12 is prevented from being damaged, the welding quality is improved, and the service performance of the battery is improved.

Adjacent cells may be connected by busbars.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate for fixing the plurality of batteries. The battery may be a quadrangular cell, i.e. the battery may be a prismatic cell.

As shown in fig. 5, a plurality of batteries may be provided in the battery case 1 after forming the battery module 2, and the plurality of batteries may be fixed by end plates and side plates. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

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 within 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 that have been 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 (14)

1. A battery, characterized by, that includes electric core (10), electric core (10) includes electric core main part (11) and utmost point ear (12), utmost point ear (12) are stretched out by electric core main part (11), utmost point ear (12) include first welding impression (121) and second welding impression (122), second welding impression (122) covers first welding impression (121), first welding impression (121) include first welding impression section (1211) and second welding impression section (1212), first welding impression section (1211) with form overlap area (1213) between second welding impression section (1212).

2. The battery according to claim 1, characterized in that the second solder print (122) does not coincide with the overlap region (1213).

3. The battery according to claim 2, characterized in that the second solder print (122) comprises a third solder print segment (1221) and a fourth solder print segment (1222), the third solder print segment (1221) and the fourth solder print segment (1222) covering the first solder print segment (1211) and the second solder print segment (1212), respectively.

4. The battery of claim 3, wherein the area of the third solder segment (1221) is greater than the area of the overlap region (1213) and the area of the fourth solder segment (1222) is greater than the area of the overlap region (1213).

5. The battery according to claim 3, characterized in that the area of the third solder section (1221) occupies 10-50% of the area of the first solder section (1211), or the area of the fourth solder section (1222) occupies 10-50% of the area of the second solder section (1212), or the area of the second solder print (122) occupies 10-50% of the area of the first solder print (121).

6. The battery according to claim 5, characterized in that the area of the third solder section (1221) is 40mm²-400 mm²Or the area of the first welding print (121) is 80mm²-800 mm²。

7. The battery according to claim 2, characterized in that the distance between the second solder print (122) and the overlap area (1213) is 0.5-3 mm.

8. The battery according to claim 7, characterized in that the distance between the second solder print (122) and the overlap area (1213) is 1-2 mm.

9. The battery according to claim 1, characterized in that the second solder print (122) is located in the middle of the first solder print (121).

10. The battery according to claim 1, wherein the tab (12) comprises a plurality of single-piece tabs, and the first weld mark (121) is formed by pre-welding the tab (12) to join the plurality of single-piece tabs;

wherein, first weld impression (121) with second weld impression (122) form in proper order, first weld impression (121) are the ultrasonic welding impression, second weld impression (122) are the laser welding impression.

11. The battery according to any one of claims 1 to 10, further comprising a cover plate assembly, wherein the second weld print (122) is formed by welding the tab (12) and the cover plate assembly to connect the tab (12) and the cover plate assembly.

12. The battery according to claim 11, wherein the cover plate assembly comprises a cover plate (20) and a pole assembly (30), the pole assembly (30) is disposed on the cover plate (20), and the second weld (122) is formed by welding the tab (12) and the pole assembly (30) to connect the tab (12) and the pole assembly (30).

13. The battery according to claim 11, wherein the cover plate assembly comprises a cover plate (20), a pole assembly (30) and an adapter plate (40), the pole assembly (30) is disposed on the cover plate (20), the adapter plate (40) is connected with the pole assembly (30), and the second welding mark (122) is formed by welding the tab (12) and the adapter plate (40) to connect the tab (12) and the adapter plate (40).

14. The battery according to claim 13, wherein the interposer (40) comprises a fusing portion (41).

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