CN217740744U - Battery with a battery cell - Google Patents

Abstract

The utility model relates to a battery technology field provides a battery. The battery includes electric core, electric core includes electric core main part and utmost point ear, utmost point ear is extended by electric core main part, utmost point ear includes that first welding seal and second weld the seal, the second welds the seal and covers first welding seal, and the second welds the seal and is formed with circumference confined space, in order to expose first welding seal, when carrying out the welding of utmost point ear and apron subassembly promptly, twice welding has been carried out to utmost point ear, and a hollow second welding seal has been formed, can control the welding energy better, and can realize the heat dissipation better, make the welding heat not concentrate, heat distribution is more even, thereby improve the welding quality, 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 related technology, the cover plate component is connected with the pole ear of the battery core, the connection of the pole ear and the cover plate component is realized directly by welding, and the problem of damage to the pole ear or poor welding quality can occur during welding due to the structural limitation of the pole ear, so that the reliability of connection is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a 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 includes that first welding seal and second weld the seal, and the second welds the seal and covers first welding seal, and the second welds the seal and is formed with circumference confined space to expose first welding seal.

The utility model discloses the battery includes electric core, electric core includes electric core main part and the utmost point ear that extends out by electric core main part, through be formed with first welding seal and second welding seal on utmost point ear, the second welds the seal and covers first welding seal, thereby the second welds the seal and is formed with circumference confined space and exposes the partly of first welding seal, when carrying out the welding of utmost point ear and apron subassembly promptly, twice welding has been carried out to utmost point ear, and a hollow second welding seal has been formed, can control the welding energy better, and can realize the heat dissipation better, make the welding heat not concentrate, heat distribution is more even, with this welding quality is improved, 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 portion of the structure of a battery according to one exemplary embodiment;

FIG. 4 is a schematic view of a portion of a battery according to another exemplary embodiment;

FIG. 5 is a schematic diagram illustrating a partial structure of a battery pack according to an exemplary embodiment;

fig. 6 is a schematic flow diagram illustrating a method of manufacturing a battery according to an exemplary embodiment.

The reference numerals are illustrated 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; 122. second welding and printing; 123. a space; 20. a cover plate; 30. a pole assembly; 40. a patch; 41. a fusing portion; 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, 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 encompass, for example, 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 as a specific case by a person skilled in the art.

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 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 welding seal 121 and second welding seal 122, second welding seal 122 covers first welding seal 121, and second welding seal 122 is formed with circumference confined space 123 to expose first welding seal 121.

The utility model discloses a battery of an embodiment includes electric core 10, 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 seal 121 and second welding seal 122 on utmost point ear 12, second welding seal 122 covers first welding seal 121, thereby second welding seal 122 is formed with circumference confined space 123 and exposes the partly of first welding seal 121, when carrying out the welding of utmost point ear 12 with the apron subassembly promptly, twice welding has been carried out to utmost point ear 12, and a hollow second welding seal 122 has been formed, can control welding energy better, can realize the heat dissipation better, make the welding heat unconcentrated, heat distribution is more even, with this improvement welding quality, thereby improve the performance of battery.

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. And because the second welding seal 122 is formed with the circumferentially confined space 123, second welding seal 122 is the hollow welding seal promptly, thereby can make can realize the heat dissipation better, make the welding heat not concentrated, the heat distribution is more even to this improves welding quality, and welds the outward appearance more excellently. The second solder stamp 122 covering the first solder stamp 121 may be regarded as an orthographic projection of the second solder stamp 122 located within the first solder stamp 121, and the space 123 may expose the first solder stamp 121, although a circumferential outer side of the second solder stamp 122 may also expose the first solder stamp 121, and in some embodiments, it is not excluded that a circumferential outer side of the second solder stamp 122 does not expose the first solder stamp 121.

The second welding stamp 122 is a hollow welding stamp, the space 123 of the hollow welding stamp can be used as a heat dissipation space, the melting width is smaller than that of a solid welding stamp, and the uniform temperature distribution is facilitated, so that the phenomena of faults and uneven surfaces of the welding stamps are not easy to cause, and the high-quality welding stamp is obtained through the hollow welding stamp.

In one embodiment, the space 123 is circular, that is, the middle portion of the second welding mark 122 encloses a circle, which not only facilitates the welding head to form the welding track design of the second welding mark 122, but also ensures the welding quality of the tab 12 and the cover plate assembly, and ensures the area of the first welding mark 121 covered by the second welding mark 122, thereby ensuring the welding stability of the tab 12 and the cover plate assembly.

In one embodiment, the second welding stamp 122 is a circular ring, so as to form a circular space 123, the circular second welding stamp 122 is more convenient to form due to the fillet transition at the corner in the forming process, and the welding track for forming the second welding stamp 122 by welding is relatively simple, so that the welding efficiency can be improved on the basis of improving the welding stability of the tab 12 and the cover plate assembly.

In one embodiment, the area of the space 123 occupies 5% -30% of the sum of the area of the second solder mark 122 and the area of the space 123, and on the basis of ensuring that the space 123 of the hollow solder mark can be used as a heat dissipation space, the second solder mark 122 can also be ensured to have enough area, so as to ensure the reliability of the welding.

The area of space 123 occupies the area of second welding seal 122 and is unfavorable for thermal giving off when the area sum of space 123 is less than 5%, the problem of heat concentration can appear, and the area of space 123 occupies the area of second welding seal 122 and when the area sum of space 123 is greater than 30%, then the area of second welding seal 122 is not big enough, thereby can cause the relatively poor problem of connection stability, influence the stability of battery, and, welding area leads to the overcurrent capacity who overflows the battery inadequately, influence the battery performance.

The area of the space 123 may be a, the area of the second solder mark 122 may be b, and a/(a + b) may be 5%, 6%, 7%, 8%, 10%, 12%, 15%, 16%, 20%, 22%, 23%, 25%, 26%, 27%, 29%, or 30%, and so on.

In one embodiment, the second solder mark 122 has an area of 10mm ² -200 mm ² Therefore, the area of the second solder mark 122 can be ensured to be relatively reasonable, and the excessive area cannot be occupied on the basis of ensuring the connection stability, so that the welding efficiency is influenced.

The area of the second solder print 122 may be 10mm ² 、11mm ² 、15mm ² 、20mm ² 、30mm ² 、40mm ² 、50mm ² 、55mm ² 、60mm ² 、70mm ² 、75mm ² 、80mm ² 、90mm ² 、100mm ² 、120mm ² 、150mm ² 、155mm ² 、165mm ² 、170mm ² 、175mm ² 、180mm ² 、185mm ² 、190mm ² 、195mm ² 、199mm ² Or 200mm ² And so on.

In one embodiment, the melted width of the second welding stamp 122 is 1.5mm to 6mm, so as to ensure that the second welding stamp 122 can reliably connect the tab 12, and avoid the second welding stamp 122 from being too wide.

The second solder mark 122 may be a circular ring, and the melt width of the second solder mark 122 is the ring diameter of the circular ring, and the melt width of the second solder mark 122 may be 1.5mm, 1.6mm, 1.7mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 5.8mm, 5.9mm, or 6mm, and so on.

Note that the melt width of the second welding mark 122 may be considered as the melt width of the tab 12 when the second welding mark 122 is formed, and as shown in fig. 1, the second welding mark 122 is a circular ring, and the melt width of the second welding mark 122 is the ring diameter of the circular ring, that is, the difference between the outer diameter of the circular ring and the inner diameter of the circular ring.

In one embodiment, the first welding stamp 121 is rectangular, which is not only simple in structure and convenient to form, but also can ensure that the tab 12 has reliable connection quality.

In one implementation, the first welding mark 121 is square, and the size of the first welding mark 121 is 5mm × 5mm-20mm × 20mm, so that on the basis of facilitating welding and forming, the tab 12 can be prevented from being damaged due to the oversize size of the first welding mark 121, the welding efficiency is not improved, and the connection stability of the tab 12 can not be ensured due to the undersize size of the first welding mark 121.

The size of the first solder mark 121 is 5mm × 5mm to 20mm × 20mm, i.e., the size of the first solder mark 121 in the length direction is equal to the size in the width direction, and the size of the first solder mark 121 may be 5mm × 5mm, 6mm × 6mm, 7mm × 7mm, 10mm × 10mm, 15mm × 15mm, 16mm × 16mm, 17mm × 17mm, 19mm × 19mm, or 20mm × 20mm, etc.

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 pad 121 may be polygonal, such as rectangular. The first solder print 121 may also be circular, oval, irregular, etc.

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 high, due to the presence 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 during the second welding, the possibility of damage to the tab 12 is greatly reduced, further considering that the second print 122 is a hollow print, although the welding energy is concentrated, the possibility of damage to the tab 12 is greatly reduced due to the first print 121.

The single tab may be a metal sheet, and 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 are not specifically limited herein.

In one embodiment, the tab 12 includes a plurality of single tabs, and the number of the plurality of single tabs is 100-200, that is, the tab 12 may be composed of a relatively large number of single tabs, in order to increase the energy density of the battery, the battery core 10 may be made thick, thereby causing the number of layers of the single tabs to increase, in order to make the welding strength of the large number of single tabs and the cover plate assembly, a high welding energy is generally required, but the welding quality is poor due to too concentrated heat, so that the welding reliability of the tab 12 may be ensured and the welding quality may be improved by forming the first welding mark 121 and the second welding mark 122 on the tab 12.

The tab 12 may include a number of single tabs of 100, 101, 110, 115, 120, 125, 130, 140, 145, 150, 155, 160, 170, 180, 185, 190, 195, 199, or 200, etc.

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 impression 121 and the second welding impression 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 thin metal sheets, so that the strength of the tab 12 is enhanced, and the damage of the tab 12 is avoided. And then the two pairs of the tabs 12 and the cover plate assembly are welded in a welding mode, so that the connection strength of the tabs 12 and the cover plate assembly is enhanced, and the damage to the tabs 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 mark 121 is a laser solder mark and the second solder mark 122 is an ultrasonic solder mark.

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, and because second welding seal 122 is formed with space 123, thereby can make the energy of laser more concentrated, with this welding quality who improves metal sheet and apron subassembly.

In one embodiment, the first welding impressions 121 can be at least two, and the adjacent first welding impressions 121 are arranged at intervals, that is, at least two first welding impressions 121 are formed by separate welding when performing pre-welding. The number of the second welding imprints 122 may be one or at least two, the second welding imprints 122 may correspond to the first welding imprints 121 one by one, and the second welding imprints 122 may also be less than the first welding imprints 121, that is, a part of the first welding imprints 121 does not cover the second welding imprints 122.

In one embodiment, the battery further includes a cover plate assembly, 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 outlet of the battery cell 10, and the second welding mark 122, which is hollow, can improve the connection quality of the tab 12 and the cover plate assembly.

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 with 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 lug 12, so that an adapter plate 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 post assembly 30 and an adaptor plate 40, the pole post assembly 30 is disposed on the cover plate 20, the adaptor plate 40 is connected to the pole post assembly 30, a second welding stamp 122 is formed by welding the pole tab 12 and the adaptor plate 40 to connect the pole tab 12 and the adaptor plate 40, the pole tab 12 is electrically connected to the pole post assembly 30 through the adaptor plate 40, which not only facilitates the position arrangement of the pole post assembly 30, but also facilitates the adaptor plate 40 to connect the pole tab 12 and the pole post 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 adaptor sheet 40 may be welded to the pole assembly 30 and the tab 12 at the same time, that is, the adaptor sheet 40 may form the second weld 122 when being welded to the pole 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 interposer 40 includes the fusing portion 41, so that the space of the interposer 40 for connecting the tab 12 and the pole assembly 30 becomes smaller, and the welding area of the interposer 40 and the tab 12 determines the overcurrent capacity of the battery, in this embodiment, the first welding print 121 and the second welding print 122 are formed in sequence, and the second welding print 122 is formed on the first welding print 121, and the hollow second welding print 122 can better control the welding energy, and can better realize heat dissipation, so that the welding heat is not concentrated, the heat distribution is more uniform, and therefore the interposer 40 and the tab 12 can be ensured to have reliable welding areas, thereby forming stable connection in a limited space, and further 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 plate assemblies may be two, the two cover plate assemblies are respectively disposed at two opposite ends of the shell member 50, and the two pole post assemblies 30 may be respectively disposed on the two cover plates 20. In some embodiments, the cover assembly may be one, the cover assembly is disposed on the housing member 50, and the 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 not only convenient to assemble, but also can be processed to obtain 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 together, 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 disposed between the first pole piece and the second pole piece are wound to obtain the winding battery cell.

In one embodiment, the fault rate of the cross section of the overlapping region of the first welding mark 121 and the second welding mark 122 of the tab 12 is not more than 30%, so that reliable contact of a plurality of single tabs of the tab 12 can be ensured, the overcurrent capacity of the tab 12 can be ensured, and the welding stability of the tab 12 and the cover plate assembly can be ensured, thereby improving the overcurrent capacity of the battery. The second welding stamp 122 is a hollow welding stamp, the space 123 of the second welding stamp 122 can be used as a heat dissipation space, although the heat of the hollow welding stamp is concentrated, the space 123 can be used as a heat dissipation space, and the first welding stamp 121 improves the strength of the tab 12, so that the hollow welding stamp is heated more uniformly, the fault phenomenon of the hollow welding stamp is reduced, and the connection capability of the tab 12 is improved.

It should be noted that the tab 12 may include m single tabs, and the number of the adjacent single tabs that are not connected is calculated as n by performing a metallographic test on a cross section of an overlapping region of the first welding mark 121 and the second welding mark 122 and observing one cross section, that is, the number of the single tabs that are not connected to the first welding mark 121 and the second welding mark 122 is calculated as n, and the fault rate of the cross section of the overlapping region of the first welding mark 121 and the second welding mark 122 of the tab 12 is calculated as n/m. Alternatively, the tab 12 may include m single tabs, and the number of the non-connected sections of the adjacent single tabs is calculated as n1 by observing two cross sections when the cross sections of the overlapping region of the first welding stamp 121 and the second welding stamp 122 are metallographic tested, and the number of the non-connected sections of the adjacent single tabs is calculated as n2 by observing two cross sections, and the fault rate of the cross section of the overlapping region of the first welding stamp 121 and the second welding stamp 122 of the tab 12 is (n 1+ n 2)/2 m. Specifically, the tab 12 formed with the first and second weld imprints 121 and 122 is cut out, and only a sample formed with a welding area remains. Put into the mould with the sample, can utilize high definition crystal glue to mix, mixing ratio 40:1:1, pouring the mixture into a mold, and taking out a sample after solidification. The test piece is cut by a cutter, that is, at least a cross section of an overlapping region of the first solder mark 121 and the second solder mark 122 is exposed, for example, one test piece is cut from the middle, thereby forming two test pieces which can be used for observation, that is, two cross sections can be observed, the sample is ground, the sample is subsequently corroded, a fault is observed by a microscope, and the number of faults is recorded.

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

The utility model discloses a group battery of an embodiment includes the battery, the battery includes electric core 10, 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 seal 121 and second welding seal 122 on utmost point ear 12, second welding seal 122 covers first welding seal 121, and second welding seal 122 is formed with circumference confined space 123 thereby expose the partly of first welding seal 121, when carrying out the welding of utmost point ear 12 and apron subassembly promptly, twice welding has been carried out to utmost point ear 12, and a hollow second welding seal 122 has been formed, can control the welding energy better, and can realize the heat dissipation better, make the welding heat not concentrate, heat distribution is more even, with this improvement welding quality, thereby improve the performance of group battery.

Adjacent cells may be connected by a bus bar.

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 can also include end plate and curb plate, and end plate and curb plate are used for fixing a plurality of batteries. The battery may be a quadrangular battery, i.e. the battery may be a prismatic battery.

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.

An embodiment of the present invention further provides a battery manufacturing method, please refer to fig. 6, the battery manufacturing method includes:

s101, pre-welding a plurality of single tabs on the cell body 11 to form a first weld mark 121 on the tab 12;

s103, welding the pole assembly 30 of the cover plate assembly with the tab 12 to form a second welding impression 122 on the tab 12, and enabling the second welding impression 122 to cover the first welding impression 121, and the second welding impression 122 is formed with a circumferentially closed space 123 to expose the first welding impression 121; or the like, or, alternatively,

the interposer 40 of the cover plate assembly is welded with the tab 12 to form a second welding impression 122 on the tab 12, such that the second welding impression 122 covers the first welding impression 121, and the second welding impression 122 is formed with a circumferentially closed space 123 to expose the first welding impression 121.

The utility model discloses a battery manufacturing approach forms first welding seal 121 through carrying out the prewelding to utmost point ear 12, and weld apron subassembly and utmost point ear 12 on first welding seal 121, second welding seal 122 has been formed, twice welding has been carried out to utmost point ear 12 promptly, thereby second welding seal 122 is formed with circumference confined space 123 and exposes a part of first welding seal 121, a hollow second welding seal 122 has been formed promptly, can control the welding energy better, and can realize the heat dissipation better, make the welding heat unconcentrated, the heat distribution is more even, with this welding quality that improves.

In one embodiment, 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 each single tab of the tab 12 is combined together, and the structural strength of the tab 12 is improved to some extent, so that when the tab 12 is welded to the cover plate assembly, even if 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 second welding stamp 122 is a hollow welding stamp, the space 123 of the hollow welding stamp can be used as a heat dissipation space, the melting width is smaller than that of a solid welding stamp, and the uniform distribution of temperature is facilitated, so that the phenomena of faults and uneven surfaces of the welding stamps are not easy to cause, and the high-quality welding stamp is obtained through the hollow welding stamp.

In one embodiment, the first welding mark 121 may be a first welding mark formed by pre-welding the tab 12 and the cover plate assembly, that is, a first welding mark with relatively low welding energy is used to combine the single tabs of the tab 12, and of course, the tab 12 and the cover plate assembly are connected, and then a second welding mark 122 formed on the first welding mark 121 is used to stably connect the tab 12 and the cover plate assembly by a second welding mark with relatively high welding energy.

In one embodiment, the first welding forms a first weld 121 and the second welding forms a second weld 122, and the first welding may be any one of ultrasonic welding and laser welding. Correspondingly, any one of ultrasonic welding and laser welding can be adopted in the second welding mode, 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 weld impression 121 is formed on the tab 12 using ultrasonic welding, and the tab 12 and the pole assembly 30 are laser welded to form the second weld impression 122.

In one embodiment, the first weld impression 121 is formed on the tab 12 by ultrasonic welding and the tab 12 and the tab 40 are laser welded to form the second weld impression 122.

In one embodiment, the fusing part 41 is formed on the interposer 40, the space of the interposer 40 for connecting the tab 12 and the post assembly 30 becomes smaller, and the welding area of the interposer 40 and the tab 12 determines the overcurrent capacity of the battery, in this embodiment, the first welding print 121 and the second welding print 122 are formed in sequence, and the second welding print 122 is formed on the first welding print 121, while the hollow second welding print 122 can better control the welding energy, and can better realize heat dissipation, so that the welding heat is not concentrated, the heat distribution is more uniform, and therefore the interposer 40 and the tab 12 can be ensured to have reliable welding areas, and stable connection can be formed in some spaces, thereby ensuring the overcurrent capacity of the battery.

In one embodiment, the second welding mark 122 is formed by adopting a welding path of a circular ring diversification spiral, which not only can conveniently form the second welding mark 122 in the form of a circular ring, but also can ensure the welding quality and avoid the fault rate of the tab 12 being higher than 30%.

In one embodiment, the second welding mark 122 is formed by a sine-line welding path or a residual-chord-line welding path, which not only facilitates forming the second welding mark 122 in the form of a circular ring, but also ensures the welding quality and avoids the fault rate of the tab 12 being higher than 30%.

In one embodiment, forming the second solder print 122 includes: establishing a welding track; a welding path with a sinusoidal line or a welding path with a chordal line is welded along the welding track to form the second weld impression 122. That is, when welding is performed by the welding head, a welding track, which is the general shape of the final second weld mark 122, may be established, so that the welding head may subsequently fill the welding track with a sine-line welding path or an excess-line welding path when welding is performed along the welding track, thereby forming the second weld mark 122.

Specifically, a welding track can be established through a control program, the welding track can be regarded as a preset virtual welding path, the specific welding head walking path is the welding track, the welding is just walking in a sine line or cosine line mode, and further the welding track is finally formed by splicing a plurality of sine lines or cosine lines.

In one embodiment, establishing a welding track includes: determining a radius value for a first direction; determining a radius value of a second direction, wherein the first direction is perpendicular to the second direction, namely the first direction can be regarded as the approximate shape of the welding track; the start angle and the end angle of the weld are determined, and are 0 and 360 respectively, so that the welding track is a circumferentially closed track, and finally a circumferentially closed second weld mark 122 can be formed.

The radius value in the first direction and the radius value in the second direction substantially determine the shape of the welding track, and the radius value in the first direction may be equal to the radius value in the second direction, so that the welding track is circular, and finally, an annular second welding mark 122 may be formed. The radius value in the first direction may not be equal to the radius value in the second direction, and the welding track is elliptical.

In one embodiment, the welding is performed along a welding track with a sinusoidal wire welding path or a chordal wire welding path, comprising: determining the pulse width of a sine line or a residual line so as to control the walking path of the welding head and control the welding density; determining the frequency height of a sine line or a residual line, and controlling the fusion width of the formed second welding print 122 so as to ensure that the second welding print 122 can be reliably connected with the tab 12; and controlling the welding head to run, namely the welding head can run along the welding track in a sine line or a cosine line mode.

In one embodiment, a battery manufacturing method is used to form the battery described above. The related structure and size of the battery manufacturing method can refer to the above battery, and are not described herein.

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 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 (16)

1. A battery, characterized by, including electric core (10), electric core (10) includes electric core main part (11) and utmost point ear (12), utmost point ear (12) by electric core main part (11) extend out, utmost point ear (12) include first weld impression (121) and second weld impression (122), second weld impression (122) cover first weld impression (121), just second weld impression (122) are formed with circumference confined space (123), in order to expose first weld impression (121).

2. The battery according to claim 1, characterized in that, the space (123) is circular.

3. The battery according to claim 2, characterized in that the second weld impression (122) is a circular ring.

4. The battery according to any one of claims 1 to 3, characterized in that the area of the space (123) occupies 5-30% of the sum of the area of the second solder print (122) and the area of the space (123).

5. The battery according to claim 4, characterized in that the area of the second solder print (122) is 10mm ² -200 mm ² 。

6. The battery according to any of claims 1-3, characterized in that the second solder print (122) has a melt width of 1.5-6 mm.

7. The battery according to any one of claims 1 to 3, characterized in that the first solder print (121) is square.

8. The battery according to claim 7, characterized in that the first solder print (121) has dimensions of 5mm x 5mm-20mm x 20mm.

9. The battery according to any one of claims 1 to 3, characterized in that the second solder print (122) is located in the middle of the first solder print (121).

10. The battery according to any one of claims 1 to 3, wherein the tab (12) comprises a plurality of single-piece tabs, and the first weld print (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 3, further comprising a cover plate assembly, wherein the second weld mark (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).

15. The battery according to any one of claims 1 to 3, characterized in that a fault rate of a cross section of a region where the first weld impression (121) and the second weld impression (122) of the tab (12) overlap is not more than 30%.

16. The battery according to any one of claims 1 to 3, wherein the tab (12) comprises a plurality of single-piece tabs, the plurality of single-piece tabs being 100-200 in number.

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