CN117878540A - Connection piece and electric core - Google Patents
Connection piece and electric core Download PDFInfo
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- CN117878540A CN117878540A CN202410275971.0A CN202410275971A CN117878540A CN 117878540 A CN117878540 A CN 117878540A CN 202410275971 A CN202410275971 A CN 202410275971A CN 117878540 A CN117878540 A CN 117878540A
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- 238000007373 indentation Methods 0.000 claims abstract description 127
- 238000003466 welding Methods 0.000 claims abstract description 89
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 230000002349 favourable effect Effects 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 20
- 230000000694 effects Effects 0.000 description 17
- 230000009286 beneficial effect Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000011295 pitch Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 4
- 230000003405 preventing effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 1
- 208000010727 head pressing Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention provides a connecting sheet and a battery cell, wherein the connecting sheet comprises a lug connecting part and a pole connecting part which are connected; the pole connecting part is provided with a first welding surface connected with pole welding and a laser incidence surface opposite to the first welding surface, the laser incidence surface is provided with an indentation area with a plurality of indentations, and the projection area S of each indentation on the laser incidence surface meets the following conditions: 0.04mm 2 ≤S≤6mm 2 The depth H of each indentation satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm. According to the connecting piece, the projected area S of the indentations in the thickness direction of the pole connecting part meets 0.04mm by arranging the indentation area with a plurality of indentations 2 ≤S≤6mm 2 The depth H of each indentation is more than or equal to 0.1mm and less than or equal to 0.5mm, which is favorable for reducing the reflection of laser beams, improving the absorptivity of the pole connection part to the laser beam energy, not only being favorable for improving the laser welding efficiency and the welding quality, but also being favorable for reducing the abrasion of the die for indentation forming and being favorable for prolongingLong die life.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a connecting sheet. Meanwhile, the invention also relates to a battery cell provided with the connecting sheet.
Background
The connecting piece in the prior art is connected with the pole and the lug respectively, wherein the connecting piece is connected with the bottom plate of the pole specifically through laser welding. Because the connection piece is generally made of copper, when the bottom plate of connection piece and utmost point post is welded to the laser beam, the high reflection (reflection of light) problem can appear in the laser beam of laser beam transmission to make the partial energy of laser beam transmission absorbed by the connection piece less, so can reduce the penetration depth of laser beam and reduce welding quality and efficiency, make the welding effect between negative electrode connection piece and the utmost point post poor. When the high-speed and high-speed problem is serious, the welding equipment is stopped, so that the connecting sheet cannot be welded, and the production beat and the production efficiency of the battery cell are affected.
Disclosure of Invention
In view of the above, the present invention is directed to a connecting piece for improving the energy absorption rate of a laser beam and the laser welding efficiency.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a connecting piece comprises a tab connecting part and a pole connecting part which are arranged in a connecting way;
the pole connecting part is provided with a first welding surface which is connected with the pole in a welding way, and a laser incidence surface which is opposite to the first welding surface, wherein the laser incidence surface is provided with an indentation area with a plurality of indentations, and the projection area S of each indentation in the thickness direction of the pole connecting part meets the following conditions: 0.04mm 2 ≤S≤6mm 2 The depth H of each indentation satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm; the area Q of the indentation area, the area M of the laser incidence surface, and the ratio N of the area Q of the indentation area to the area M of the laser incidence surface satisfies the following conditions: n is more than or equal to 35% and less than 80%.
Further, the lateral distance X between two adjacent indentations in the width direction of the laser light incident surface satisfies: x is more than or equal to 0.2mm and less than or equal to 2mm;
the longitudinal distance Y between two adjacent indentations in the length direction of the laser incidence surface is as follows: y is more than or equal to 0.2mm and less than or equal to 2mm.
Further, an included angle Z between the sidewall of the indentation and the laser incident surface satisfies: z is more than or equal to 45 degrees and less than or equal to 85 degrees.
Further, the cross section of the indentation is at least one of square, round, trapezoid or triangle.
Further, the tab connection part is in a U shape, and the pole connection part is connected to the other end of the tab connection part relative to the U-shaped opening; and/or the number of the groups of groups,
the tab connection part is provided with a second welding surface which is connected with the tab in a welding way, the other surface of the tab connection part is also provided with an indentation area relative to the second welding surface, and the tab connection part is connected with the tab in a laser welding way.
Further, the pole connection portion and the tab connection portion are integrally formed; and/or the number of the groups of groups,
the pole connection part and the pole lug connection part are both made of copper.
Further, the pole connection portion and the tab connection portion are disposed coplanar, or,
the pole connection parts are arranged in a staggered and spaced mode from top to bottom, and are connected with the pole connection parts through connecting ribs which are obliquely arranged.
Further, the spacing distance L between the tab connection portion and the tab connection portion satisfies: l is more than or equal to 4mm; and/or the number of the groups of groups,
the inclination angle alpha of the connecting rib meets the following conditions: alpha is less than 90 DEG and 0 DEG.
Compared with the prior art, the invention has the following advantages:
according to the connecting piece, the indentation area with a plurality of indentations is arranged on the laser incidence surface on the pole connecting part, and the projection area S of the indentations in the thickness direction of the pole connecting part meets the following conditions: 0.04mm 2 ≤S≤6mm 2 The depth H of each indentation satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm, so that the high-reflectivity problem of a laser beam is reduced, the stop of welding equipment is effectively avoided, the absorptivity of a pole connection part to laser beam energy is improved, the high-reflectivity problem of a connecting sheet in the laser welding process can be effectively prevented, the laser welding efficiency and quality are improved, the assembly safety and reliability of the connecting sheet are improved, the production efficiency is improved, and the production cost of an electric core is reduced. Meanwhile, the arrangement of the projection area and depth of the indentation is beneficial to reducing the abrasion of the die for forming the indentation area, prolonging the service life of the die and further reducing the production cost.
In addition, the arrangement of the ranges of the transverse interval X and the longitudinal interval Y between two adjacent indentations is beneficial to the reasonable arrangement of the indentations, so that the occurrence of the high-contrast problem of laser beams can be further reduced. The arrangement of the range of the ratio N of the area Q of the indentation area to the area M of the laser incidence surface is beneficial to reducing the high reflection. The arrangement of the included angle Z range between the side wall of the indentation and the laser incidence surface is beneficial to further preventing high reflection, so that the absorption effect on the laser beam energy can be increased. The cross section of the indentation is at least one of square, round, trapezoid or triangle, which is easy to process and shape and has good effect of preventing reflection.
In addition, the shape of the connecting part of the tab is beneficial to realizing the connection with the tab, and the structure is simple and easy to process and shape; the tab connection part is also welded and connected with the tab through the indentation area, so that the welding quality is better. The pole connection part and the pole lug connection part are integrally formed, so that the processing efficiency of the connecting sheet is improved; the lug connection part and the pole connection part made of copper are beneficial to improving the electrical property of the connecting sheet. The pole connection parts and the pole lug connection parts are coplanar or staggered up and down and are arranged at intervals, so that the use requirements of different electric cores can be met. The setting of interval distance scope between utmost point post connecting portion and the utmost point ear connecting portion to and the setting of connecting rib inclination all do benefit to the performance that promotes the connection piece.
In addition, another object of the invention is to propose a cell comprising a connecting piece as described above.
According to the battery cell, the connecting sheet is arranged, so that the production efficiency and the qualification rate of the battery cell are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic structural view of a first connecting piece according to an embodiment of the present invention at a first view angle;
fig. 2 is a schematic structural view of a first connecting piece according to an embodiment of the present invention at a second view angle;
FIG. 3 is a schematic view of a portion of an indentation area according to an embodiment of the present invention;
FIG. 4 is a schematic view of the positions of the lateral and longitudinal pitches according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the positions of the indentation depth and the included angle Z according to the embodiment of the present invention;
fig. 6 is a schematic structural view of a second connecting piece according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a third connecting piece according to an embodiment of the present invention.
Reference numerals illustrate:
1. a post connection portion; 2. a tab connection portion;
100. an indentation area; 101. a laser light incidence surface; 102. a connecting rib; 103. indentation;
201. and a second welding surface.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be noted that, if terms indicating an azimuth or a positional relationship such as "upper", "lower", "inner", "back", and the like are presented, they are based on the azimuth or the positional relationship shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The embodiment relates to a connecting sheet, which aims to reduce the reflection problem of a laser beam by optimizing the structure of the connecting sheet, thereby improving the energy absorption rate of the laser beam and the laser welding efficiency
The connecting piece comprises a tab connecting part 2 and a pole connecting part 1 which are arranged in a connecting way. Wherein,the post connecting portion 1 has a first welding surface to which the post is welded, and a laser light incidence surface 101 provided opposite to the first welding surface, and an indentation area 100 having a plurality of indentations 103 is provided on the laser light incidence surface 101. The projected area S of each indentation 103 in the thickness direction of the post connecting portion 1 satisfies: 0.04mm 2 ≤S≤6mm 2 The depth H of each indentation 103 satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm.
The connecting piece of the present embodiment is formed by providing a plurality of indentations 103 on the laser incident surface 101 on the pole connecting portion 1, and the projected area S of the indentations 103 in the thickness direction of the pole connecting portion 1 satisfies: 0.04mm 2 ≤S≤6mm 2 The depth H of each indentation 103 satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm, the problem of reflection of laser beams is favorably reduced, the shutdown of welding equipment is effectively avoided, the absorptivity of the pole connection part 1 to laser beam energy is improved, the laser welding efficiency is improved, the laser welding quality is improved, the assembly safety and the production efficiency of connecting sheets are improved, and the production cost of battery cells is reduced.
Meanwhile, by setting the projection area S and the depth H of the indentation 103, the abrasion of the die for forming the indentation area 100 is reduced, the service life of the die is prolonged, and the production cost is further reduced.
Based on the above general description, an exemplary structure of the connecting piece described in this embodiment is shown in fig. 1 and 2. The indentations 103 in the present embodiment are a plurality of rows arranged at intervals in the longitudinal direction and the width direction of the pole connecting portion 1, and the above-described indentation areas 100 are formed on the laser light incident surface 101. The indentation area 100 here extends from the free end of the laser light incident surface 101 to the other end, and a space is formed between the indentation area 100 and the tab connection portion 2. It will be appreciated that the extent of the indentation area 100 may also be adapted to the application requirements in practice.
In addition, as shown in fig. 5, the depth H of the indentation 103 refers to the distance between the bottom surface of the indentation 103 and the laser light incident surface 101. In particular, the projected area S of the indentation 103 in the thickness direction of the pole connection portion 1 may be 0.04mm 2 、0.1mm 2 、1mm 2 、2mm 2 、3mm 2 、4mm 2 、5mm 2 、5.5mm 2 Or 6mm 2 . The depth H of the indentations 103 may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. In this embodiment, the projection area range and the depth range of the pressure mark 103 are beneficial to improving and solving the problem of high reflectivity of the laser beam, so that the problem of shutdown of the welding equipment caused by high reflectivity is avoided, and the welding efficiency of the connecting sheet is further improved.
In the present embodiment, the projection area S of the indentation 103 in the thickness direction of the pole connecting portion 1 specifically refers to the area of the indentation 103 that projects the outer contour from top to bottom along the thickness direction of the pole connecting portion 1.
In this embodiment, the projected area S of the indentation 103 in the thickness direction of the pole connecting portion 1 and the depth H of the indentation 103 are matched and interacted together in terms of both area and depth, which causes a problem of reducing reflection of the laser beam, so that the energy of the laser beam is absorbed more by the pole connecting portion 1, so that the energy is sufficient to cause melting of the contact area between the welded bottom plate and the pole connecting portion 1, thereby welding the first welding surface and the bottom plate of the pole together.
Specifically, when the projected area S of the indentation 103 is less than 0.04mm 2 When the depth H of the indentation 103 is smaller than 0.1mm, the welding equipment is still easy to stop, which means that the arrangement of the indentation area and depth cannot improve the high-contrast problem. Meanwhile, the specifications of the indentations 103 are small, so that the specifications of the pressing heads corresponding to the indentations 103 on the die required by the stamping forming of the indentations 103 are also small, the problem that the die is easy to wear in the using process can be caused, and the service life of the die is short. The production cost of the stamping die is high, and when the die cannot be used due to abrasion, a new die is needed, so that the production cost can be increased.
Meanwhile, when the projected area S of the indentation 103 is greater than 6mm 2 When the depth H of the indentation 103 is greater than 0.5mm, the welding equipment is still easy to stop, which means that the arrangement of the indentation area and depth cannot improve the high-contrast problem. In the same way as thisThe thickness of the indentation area 100 is obviously reduced, so that the structural strength of the indentation area is low, and the heating problem is easy to occur, thereby being unfavorable for the use safety of the connecting sheet.
As shown in fig. 4, the lateral pitch X of the adjacent two indentations 103 in the width direction of the laser entrance face 101 satisfies: x is more than or equal to 0.2mm and less than or equal to 2mm; the longitudinal distance Y between two adjacent indentations 103 in the longitudinal direction of the laser entrance face 101 satisfies the following: y is more than or equal to 0.2mm and less than or equal to 2mm. In particular embodiments, the lateral spacing X and the longitudinal spacing Y may be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, or 2mm. By setting the ranges of the transverse interval X and the longitudinal interval Y between 0.2mm and 2mm, the high-reflection preventing effect of the mutual matching of the indentations 103 is improved.
In this embodiment, when the values of the transverse pitch X and the longitudinal pitch Y are both smaller than 0.2mm, the density of the indentations 103 will be larger, and the structural strength of the connection portion of the pole will be greatly affected, so that the connection strength of the connection piece and the pole after welding will be affected, which is not beneficial to the safety of the battery core. When the values of the transverse distance X and the longitudinal distance Y are both greater than 2mm, the density of the indentations 103 is smaller, and the reflection of the laser beam by the indentation area 100 is not improved.
As a preferred embodiment, the area Q of the indentation area 100, the area M of the laser light incident surface, and the ratio N of the area Q of the indentation area 100 to the area M of the laser light incident surface 101 satisfy: n is more than or equal to 35% and less than or equal to 95%. For example, N may be 35%, 45%, 55%, 75%, 76%, 78%, 79%, 80%, 85%, 88%, 89%, 90%, 92%, or 95%. Here, by setting the range of the ratio N of the area Q of the indentation area 100 to the area M of the laser light incident surface 101, the anti-reflection effect of the indentation area 100 is made better, and the absorption efficiency for the laser beam energy is high.
When the ratio N is less than 35%, it indicates that the area occupied by the indentation area 100 is relatively low, and at this time, the improvement effect of the indentation area 100 on the reflection problem is not obvious, so that the welding of the connecting sheet and the pole is not facilitated. When the ratio N is greater than 95%, it means that the area occupied by the indentation area 100 is relatively high, which causes excessive functions of the indentation area 100, and the utilization rate of the indentation area 100 is low, thereby being unfavorable for reducing the production cost.
Referring to fig. 5, in the present embodiment, the angle Z between the sidewall of the indentation 103 and the laser light incident surface 101 satisfies: z is more than or equal to 45 degrees and less than or equal to 85 degrees. For example, the included angle Z may be 45 °, 55 °, 65 °, 75 °, 80 °, or 85 °. Through setting up the contained angle scope between the lateral wall of indentation 103 and the laser entry face 101 for the lateral wall of indentation 103 all inclines to set up, so does benefit to the anti-high back effect of strengthening indentation 103, and the simple structure of indentation 103 easily machine-shaping. When the included angle A is smaller than 45 degrees or larger than 85 degrees, the anti-reflection effect of the side wall on the laser beam is not ideal, and the problems of shutdown of welding equipment and poor welding effect caused by high laser beam are still easy to occur.
In addition, since the indentation 103 is formed by the pressing head pressing down the laser entrance surface 101 in the present embodiment, the shape of the indentation 103 depends on the shape of the pressing head on the pressing die. As a preferred structural example, the cross section of the indentation 103 is at least one of square, circular, trapezoidal, or triangular. Here, the cross section of the indentation 103 is arranged parallel to the laser light incident surface 101. As shown in fig. 3, the cross section of the indentation 103 in the present embodiment is square, which is formed by punching with a indenter having a plurality of cubes. Here the side length a of each indentation 103 satisfies: 0.2 mm.ltoreq.a.ltoreq.2 mm, for example, the side length a may be 0.2mm, 0.4mm, 0.6mm, 1mm, 1.5mm, 2mm or 2.5mm, etc. The cross section of the indentation 103 is square, and has the advantages of simple structure, good uniformity and good anti-reflection effect.
It is understood that the cross section of the indentation 103 in this embodiment may be circular, triangular, or the like, in addition to square. When the cross section of the indentation 103 is circular, the indenter is cylindrical or conical. When the cross section of the indentation 103 is triangular, the indenter may be prismatic. Of course, in specific implementation, the cross section of the indentation 103 may also have other geometric shapes, or may be a combination of various shapes, so long as the requirement of use is met.
In order to more intuitively embody the welding effect of the connecting sheet in this embodiment, laser welding tests were performed on different connecting sheets, and experimental results are shown in tables 1 and 2. From tables 1 and 2, it is possible toIt was found that, among sample 2, sample 5, sample 6 and sample 8, the projected area S of indentation 103 satisfies 0.04mm 2 ≤S≤6mm 2 The depth H of the indentation 103 satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm, and the transverse interval X meets the following conditions: x is more than or equal to 0.2mm and less than or equal to 2mm; the longitudinal spacing Y satisfies: y is more than or equal to 0.2mm and less than or equal to 2mm. The ratio N of the area Q of the indentation area 100 to the area M of the laser light incident surface 101 satisfies: n is more than or equal to 35% and less than 90%. The angle Z between the sidewall of the indentation 103 and the laser light entrance face 101 satisfies: z is more than or equal to 45 degrees and less than or equal to 85 degrees. Therefore, when the sample piece 2, the sample piece 5, the sample piece 6 and the sample piece 8 are welded by laser, the welding equipment does not have the shutdown problem, the continuous welding of the connecting sheet is realized, the welding efficiency is high, the welding effect is good, and the welding result is qualified.
In this embodiment, the projected area S of the indentations 103 in the sample 1 is less than 0.04mm 2 The projected area S of the indentations 103 in the sample 9 is greater than 6mm 2 The range of other parameters meets the requirements, but the welding equipment is stopped at the moment, so that the projection area S is smaller than 0.04mm 2 Or greater than 6mm 2 The problem of reflection of the laser beam cannot be solved, resulting in poor welding effect between the sample 1 and the sample 9. The values of the parameters in the sample 3 and the sample 4 are only smaller than 0.2mm, the values of the parameters in the sample 12 and the sample 13 are only larger than 2mm, the range of the other parameters meets the requirements, the laser beam reflection problem is still serious, the welding equipment is stopped, and the welding effect is still not ideal.
Only included angle Z is greater than 80 among all parameters of sample piece 7, included angle Z is less than 45 among sample piece 10, and the scope of other each parameter all satisfies the requirement, but at this moment, welding equipment has the problem of shutting down, and obviously, when included angle Z value is not in the reasonable within range of setting, the welding effect of sample piece 7 and sample piece 10 still is unqualified. Of the parameters of the sample 11, only the depth H of the indentation 103 is smaller than 0.1mm, and of the sample 14, only the depth H of the indentation 103 is larger than 0.5mm, and the ranges of the other parameters meet the requirements. At this time, the laser welding effect of the laser beam is still not ideal, the welding equipment is still stopped, and when the depth H of the indentation 103 is smaller than 0.1mm, the structural strength of the indentation area 100 on the connecting sheet is lower, so that the welding of the sample 11 and the sample 14 is still not qualified.
In addition, the area ratio N of the sample 15 is smaller than 35%, the area ratio N of the sample 16 is larger than 95%, and other parameters meet the requirements, so that the welding results of the two samples are still unqualified, and the problem of shutdown of the welding equipment also occurs. Meanwhile, an area ratio N of greater than 95% in sample piece 16 also makes the utilization of indentation area 100 low.
In addition, the qualified sample piece solves the problem of light reflection in the welding process, improves the absorption efficiency of laser energy, is beneficial to solving the problem of shutdown of welding equipment, and is beneficial to continuous operation of the welding equipment, thereby improving the welding efficiency and effect. The unqualified sample piece is not used for solving the problem of light reflection in the welding process, so that the problem of shutdown of the laser welding equipment in the working process is caused, the production beat is seriously influenced, and the production of the battery cell is not facilitated.
As shown in fig. 1, in the first type of connection piece structure, the tab connection portion 2 is in a "U" shape, and the post connection portion 1 is connected to the other end of the tab connection portion 2 with respect to the opening of the "U" shape. In this embodiment, the pole connection portion 1 is specifically welded to the bottom plate of the pole, and the width of the pole connection portion 1 is smaller than the width of the tab connection portion 2. In specific implementation, the specifications, shapes and the like of the tab connection part 2 and the pole connection part 1 can be determined according to the use requirements.
Still referring to fig. 1, the tab connection portions 1 and 2 in the present embodiment are staggered up and down and arranged at intervals, and the tab connection portions 1 are connected to the tab connection portions 2 by connection ribs 102 arranged obliquely, that is, the tab connection portions 2 and the tab connection portions 1 are not arranged coplanar. The connecting piece is simple in structure, easy to machine and form and good in use effect.
As a preferred embodiment, the spacing distance L between the tab connection portion and the tab connection portion satisfies: l is more than or equal to 4mm. For example, the spacing distance can be 4mm, 4.5mm, 5mm or the like, and the spacing distance can be determined according to the use requirement. The inclination angle alpha of the connecting rib meets the following conditions: for example, the inclination angle alpha can be 30 degrees, 60 degrees or 80 degrees, etc., and the specific implementation can be determined according to the use requirement.
It will be appreciated that a coplanar arrangement of both the pole connection portion 1 and the tab connection portion 2 is also possible, in which case no obliquely arranged connection bars 102 are required. In addition, the tab connection portion 1 and the tab connection portion 2 in the present embodiment are preferably integrally formed, and both may be made of copper and formed by punching with a punching die. Thus, the processing efficiency of the connecting sheet is improved, and the connecting sheet has better structural strength and electrical property. In addition, the second structure of the connecting sheet in this embodiment is shown in fig. 6, and the whole connecting sheet is L-shaped, so that the connection requirement between the tab and the post can be met.
The tab connection part 2 in this embodiment is connected to the tab by welding with the second welding surface 201, and the second welding surface 201, which is the preferred tab connection part 2, is connected to the tab by ultrasonic welding or laser welding. To improve the quality of the connection piece, the scratch roughness on the first and second soldering surfaces 201 as preferred satisfies: ra is less than or equal to 1.0 mu m, and Rz is less than or equal to 16 mu m. In this case, ra defines the conditions to be satisfied by the first and second welding surfaces 201 in terms of the scratch depth from the roughness level of the scratch and Rz.
In addition, the scratch length on both the first and second soldering faces 201 in this embodiment is not more than 1/3 of the length thereof. The welded areas of the first and second welding surfaces 201 in this embodiment are not allowed to bend. In specific implementation, the flatness of the first and second welding surfaces 201 satisfy: t is less than or equal to 0.1mm. For example, the flatness of the first and second welding surfaces 201 is 0.02mm, 0.05mm, 0.08mm, 0.1mm, or the like.
In addition, the hardness of the connecting sheet in the embodiment is required to be HV55-65, which is beneficial to improving the welding strength. In practice, the oxidized area on the connecting piece should be less than one third of the area itself. The burr direction of the four peripheral edges of the connecting sheet after welding assembly is set away from the pole group.
It should be noted that the connecting piece in this embodiment may take the form shown in fig. 7 in addition to the structural forms shown in fig. 1 and 6. Specifically, the connecting piece is rectangular, and the pole connection part 1 and the pole lug connection part 2 are respectively arranged at two ends of the connecting piece. The tab connection part 2 has a second welding surface welded to the tab, and an indentation area 100 is also provided on the other surface of the tab connection part 2 with respect to the second welding surface, and the tab connection part 2 is connected to the tab by laser welding.
Wherein, the number of the indentation areas 100 on the pole connecting part 1 is two, and the number of the indentation areas 100 on the pole lug connecting part 2 is one. The area, size and number of each indentation area 100 can be adjusted according to the requirements of the user. In specific implementation, the connecting sheet can be applied to a long-blade battery and folded after being welded with a pole post and a pole lug respectively, so that the installation on a battery core is realized. The connecting sheet in the embodiment can be adjusted according to the use requirements of the battery cells with different types so as to have a good application range.
According to the embodiment, the production technical requirements, the material requirements and the appearance quality requirements of the connecting sheet are optimized, the product quality of the connecting sheet is guaranteed, the problems of explosion points, cold joint, laser welding reflection, production assembly interference and the like of the connecting sheet in the production welding process are effectively prevented, the safety and the reliability of the assembly of the connecting sheet are improved, the production efficiency is improved, and the production cost of the battery cell is reduced.
In this embodiment, the specification of the indentation 103 is specifically set, which is favorable for alleviating the problem that the laser beam reflects light obviously after being emitted to the laser incidence surface 101 during laser welding, so as to facilitate improving the penetration depth of the laser beam, improving the efficiency of the pole bottom plate and the first welding surface in the welding process, and further facilitating improving the welding quality between the pole and the connecting sheet.
Table 1: experimental results for samples 1 to 8 (where the area is in mm 2 The unit of the spacing is mm, NG stands for unqualified, and OK stands for qualified).
Table 2: experimental junctions for samples 9 to 15Fruit (wherein the area is in mm 2 The unit of the spacing is mm, NG stands for unqualified, and OK stands for qualified).
Furthermore, the present embodiment relates to a battery cell comprising a connecting piece as described above. The battery cell of this embodiment is favorable to improving production efficiency and qualification rate of battery cell through setting up the connection piece as described above.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A connecting piece, characterized in that:
comprises a pole lug connecting part (2) and a pole post connecting part (1) which are arranged in a connecting way;
the pole connecting part (1) is provided with a first welding surface connected with the pole in a welding way and a laser incidence surface (101) which is arranged opposite to the first welding surface, the laser incidence surface (101) is provided with an indentation area (100) with a plurality of indentations (103), and the projection area S of each indentation (103) in the thickness direction of the pole connecting part (1) meets the following conditions: 0.04mm 2 ≤S≤6mm 2 The depth H of each indentation (103) satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm;
an area Q of the indentation area (100), an area M of the laser light incident surface (101), and a ratio N of the area Q of the indentation area (100) to the area M of the laser light incident surface (101) satisfies: n is more than or equal to 35% and less than 80%.
2. The connection piece according to claim 1, characterized in that:
the lateral distance X between two adjacent indentations (103) in the width direction of the laser light incidence surface (101) satisfies the following conditions: x is more than or equal to 0.2mm and less than or equal to 2mm;
the longitudinal distance Y between two adjacent indentations (103) in the length direction of the laser incidence surface (101) is as follows: y is more than or equal to 0.2mm and less than or equal to 2mm.
3. The connection piece according to claim 1, characterized in that:
the angle Z between the sidewall of the indentation (103) and the laser light incidence surface (101) satisfies the following conditions: z is more than or equal to 45 degrees and less than or equal to 85 degrees.
4. The connection piece according to claim 1, characterized in that:
the cross section of the indentation (103) is at least one of square, round, trapezoid or triangle.
5. The connection piece according to claim 1, characterized in that:
the electrode lug connecting part (2) is U-shaped, and the electrode post connecting part (1) is connected with the other end of the electrode lug connecting part (2) relative to the U-shaped opening; and/or the number of the groups of groups,
the tab connection part (2) is provided with a second welding surface (201) connected with the tab in a welding way, the indentation area (100) is also arranged on the other surface of the tab connection part (2) relative to the second welding surface (201), and the tab connection part (2) is connected with the tab in a laser welding way.
6. The connection piece according to claim 1, characterized in that:
the pole connection part (1) and the pole lug connection part (2) are integrally formed; and/or the number of the groups of groups,
the pole connection part (1) and the pole lug connection part (2) are both made of copper.
7. The connection piece according to claim 1, characterized in that:
the pole connection part (1) and the pole lug connection part (2) are arranged in a coplanar manner, or,
the pole connection parts (1) and the pole lug connection parts (2) are arranged in an up-and-down staggered mode at intervals, and the pole connection parts (1) are connected with the pole lug connection parts (2) through connection ribs (102) which are obliquely arranged.
8. The connection pad of claim 7, wherein:
the spacing distance L between the pole connection part (1) and the pole lug connection part (2) satisfies the following conditions: l is more than or equal to 4mm; and/or the number of the groups of groups,
the inclination angle alpha of the connecting rib (102) meets the following conditions: alpha is less than 90 DEG and 0 DEG.
9. The utility model provides an electric core which characterized in that:
the cell comprising a connecting tab according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410275971.0A CN117878540A (en) | 2024-03-12 | 2024-03-12 | Connection piece and electric core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410275971.0A CN117878540A (en) | 2024-03-12 | 2024-03-12 | Connection piece and electric core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117878540A true CN117878540A (en) | 2024-04-12 |
Family
ID=90595184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410275971.0A Pending CN117878540A (en) | 2024-03-12 | 2024-03-12 | Connection piece and electric core |
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| Country | Link |
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| CN (1) | CN117878540A (en) |
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