CN114696045A - Battery cell pole group, lithium ion battery and pole lug welding method - Google Patents
Battery cell pole group, lithium ion battery and pole lug welding method Download PDFInfo
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- CN114696045A CN114696045A CN202210328988.9A CN202210328988A CN114696045A CN 114696045 A CN114696045 A CN 114696045A CN 202210328988 A CN202210328988 A CN 202210328988A CN 114696045 A CN114696045 A CN 114696045A
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- 238000003466 welding Methods 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 20
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 13
- 238000010030 laminating Methods 0.000 claims abstract description 19
- 229910000679 solder Inorganic materials 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 238000003825 pressing Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
Abstract
The embodiment of the application discloses a battery cell pole group, a lithium ion battery and a pole lug welding method. A cell pole group comprising: pole pieces; utmost point ear, including laminating portion and with the extension that laminating portion connects, the extension with the pole piece interval sets up, laminating portion includes a plurality of edges the butt region and the welding area that utmost point ear length direction set up in turn, the butt region with the pole piece butt, the welding area with the pole piece welding. Compare in whole laminating portion through ultrasonic bonding in the pole piece, only welding region passes through laser welding in the laminating portion in this application embodiment to the pole piece, and the butt is regional with the inseparable butt of pole piece to the solder joint quantity between messenger laminating portion and the pole piece is less relatively, and the uniformity of solder joint is better moreover, thereby has reduced the impedance between utmost point ear and the pole piece, reduces generating heat that electric core waited when discharging.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a battery cell pole group, a lithium ion battery and a pole lug welding method.
Background
In the related art, a tab of a lithium ion battery is generally formed by hot-pressing and compounding a tab adhesive and a metal band, wherein the tab is welded to a pole piece by ultrasonic waves, and generally, all parts of the tab, which are in contact with the pole piece, are welded, however, the welding mode causes the impedance of the tab and the pole piece to be high. Therefore, on the basis of ensuring the welding strength, a person skilled in the art needs to solve the problem of how to enable the tab and the pole piece to have better conductivity after welding.
Disclosure of Invention
The embodiment of the application provides a battery cell pole group, a lithium ion battery and a pole lug welding method, which can solve the technical problems in the related art.
In a first aspect, an embodiment of the present application provides a battery cell pole group, including: pole pieces; utmost point ear, including laminating portion and with the extension that laminating portion connects, the extension with the pole piece interval sets up, laminating portion includes a plurality of edges the butt region and the welding area that utmost point ear length direction set up in turn, the butt region with the pole piece butt, the welding area with the pole piece welding.
In some exemplary embodiments, the number of the welding regions is four.
In some exemplary embodiments, each of the welding regions includes a plurality of welding points.
In some exemplary embodiments, each of the welding areas includes four rows and four columns of welding spots arranged in a matrix.
In some exemplary embodiments, the four welding regions may be arranged such that a distance between any one of the welding regions and an adjacent welding region is the same.
In some exemplary embodiments, the tab has: a first surface of the abutment region abutting the pole piece, the first surface of the welding region being welded to the pole piece; a second surface disposed opposite the first surface; and the third surface is connected with the first surface and the second surface, and the third surface of one end, away from the extending part, of the attaching part is a smooth surface.
In some exemplary embodiments, the third surface of the end of the protruding portion away from the fitting portion is a smooth surface. In some exemplary embodiments, the smooth surface comprises a semicircular arc surface.
In a second aspect, an embodiment of the present application provides a lithium ion battery, where the lithium ion battery includes: a housing; and the battery core pole group is positioned in the shell.
In a third aspect, an embodiment of the present application provides a tab welding method, including the steps of: arranging the lug corresponding to the pole piece; and laser welding is carried out on the spacing of the lugs along the length direction of the lugs so as to form a plurality of alternately arranged abutting areas and welding areas in the length direction of the lugs, wherein the abutting areas are abutted to the pole pieces, and the welding areas are laser welded with the pole pieces.
In some exemplary embodiments, an area between two adjacent welding areas on the tab is an abutting area, and after the step of disposing the tab corresponding to the pole piece, the method further includes: compressing the abutment region to the pole piece.
In some exemplary embodiments, the number of the welding areas is four, and each welding area includes four rows and four columns of welding spots arranged in a matrix.
Has the advantages that: compare in whole laminating portion through ultrasonic bonding in the pole piece, only welding region passes through laser welding in the laminating portion in this application embodiment to the pole piece, and the butt is regional with the inseparable butt of pole piece to the solder joint quantity between messenger laminating portion and the pole piece is less relatively, and the uniformity of solder joint is better moreover, thereby has reduced the impedance between utmost point ear and the pole piece, reduces generating heat that electric core waited when discharging.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic perspective view illustrating a winding of a cell electrode group according to an embodiment of the present disclosure;
fig. 2 is a front view of a cell pole group in an embodiment of the present application, when the cell pole group is unfolded;
fig. 3 is a schematic perspective view of a tab in an embodiment of the present application;
FIG. 4 is an enlarged partial schematic view of FIG. 3;
fig. 5 is a front view of a tab in another embodiment of the present application;
fig. 6 is a side view of a tab in another embodiment of the present application;
fig. 7 is a top view of a tab in another embodiment of the present application;
fig. 8 is a flow chart of a tab welding method in an embodiment of the present application.
Description of reference numerals: 100. a battery cell pole group; 110. pole pieces; 120. a tab; 121. a bonding section; 1211. an abutment region; 1212. a welding area; 1213. welding spots; 122. a protruding portion; 120a, a first surface; 120b, a second surface; 120c, a third surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the related art, the lithium ion battery has the advantages of high energy density, high output power, long charging and discharging life, no pollution, wide working temperature range, small self-discharge and the like, and is widely applied to various portable electronic devices. Wherein, the one end of lithium cell utmost point ear and pole piece are usually through ultrasonic bonding, and the part of utmost point ear and pole piece laminating is whole to be welded, and nevertheless not the solder joint more the welding effect just better, the uniformity that wholly welded mode leads to the solder joint is relatively poor to make the internal resistance of lithium cell great relatively.
Secondly, the tab is usually rectangular, four corners of the tab are right angles, when the battery cell is manufactured, the right angle of the tab is easy to tilt to form a sharp angle, because the contact part of the tab and a conductive substrate of the electrode is positioned between the pole piece and the diaphragm layer, the positive pole piece, the negative pole piece and the diaphragm positioned between the positive pole piece and the negative pole piece are wound or stacked to manufacture the battery cell, and in the process of assembling the battery, the two sharp corners of the tab fixed on the conductive substrate pierce the diaphragm slightly carelessly, so that the manufactured battery is short-circuited or slightly short-circuited, and safety accidents are induced. In addition, in the processes of battery assembly, activation, storage and use, because the battery is internally subjected to chemical reaction to generate expansion deformation, two tilted sharp corners can easily puncture the diaphragm layer and contact with the pole piece on the other side of the diaphragm layer, and the battery is short-circuited, so that the battery is scrapped.
As shown in fig. 1-2, a first aspect of the embodiment of the present application provides a cell electrode group 100, which includes a pole piece 110 and a tab 120.
The pole piece 110 can be a positive pole piece 110 or a negative pole piece 110, and the positive pole piece 110 can be made of a nickel sheet and slurry coated on the nickel sheet; the negative electrode tab 110 may be made of a copper sheet and a paste coated on the copper sheet.
The tab 120 may be a positive tab 120 or a negative tab 120, the positive tab 120 is electrically connected to the positive pole piece 110, and the negative tab 120 is electrically connected to the negative pole piece 110. Utmost point ear 120 including laminating portion 121 and with extension 122 that laminating portion 121 is connected, extension 122 with pole piece 110 interval sets up, and the part that utmost point ear 120 and pole piece 110 laminated is laminating portion 121 promptly, and utmost point ear 120 and the part that pole piece 110 was not laminated are extension 122. The extension portion 122 may be located on the same plane as the attachment portion 121, or may be perpendicular to the attachment portion 121, and the extension portion 122 may be bent into various shapes as needed, and generally, the extension portion 122 is electrically connected to a circuit board of the battery. After the earphone is welded with the pole piece 110, the cell pole group 100 is formed by winding or lamination process combination; the width and length of the tab 120 may be determined according to the specification and manufacturing requirements of the battery.
The attaching portion 121 includes a plurality of contact areas 1211 and welding areas 1212 alternately arranged in a longitudinal direction of the tab 120, the contact areas 1211 are in contact with the pole piece 110, and the welding areas 1212 are welded to the pole piece 110. That is, the bonding portion 121 includes an abutting region 1211 and a welding region 1212 which are provided at an interval, the abutting region 1211 is bonded to the pole piece 110, and the welding region 1212 is laser-welded to the pole piece 110. The specific number of the abutting regions 1211 and the specific number of the welding regions 1212 may be specifically set according to the size of the tab 120 and the actual requirements, and the size of the abutting regions 1211 may be the same as or different from the size of the welding regions 1212.
To sum up, compared with the case that the whole attaching portion 121 is welded to the pole piece 110 by ultrasonic waves, in the attaching portion 121 in the embodiment of the present application, only the welding region 1212 is welded to the pole piece 110 by laser, and the abutting region 1211 is in close abutment with the pole piece 110, so that the number of the welding points 1213 between the attaching portion 121 and the pole piece 110 is relatively small, and the consistency of the welding points 1213 is good, thereby reducing the impedance between the tab 120 and the pole piece 110, and reducing the heat generation of the battery cell during discharging.
As shown in fig. 3-4, in some embodiments, each of the bonding areas 1212 includes a plurality of bonding pads 1213. The welding spots 1213 are formed by laser welding, which is fusion welding, so that the tab 120 and the pole piece 110 can be welded more firmly, and simultaneously, the tab 120 and the pole piece 110 are fused together, so that the impedance between the tab 120 and the pole piece 110 is smaller.
In some embodiments, the plurality of solder points 1213 may be arranged in a matrix, a circle, or a line. Preferably, the number of the plurality of welding spots 1213 of each of the welding areas 1212 is 16, and the 16 welding spots 1213 are arranged in a matrix of four rows and four columns.
With continued reference to fig. 3, in some embodiments, the number of the welding regions 1212 may be one or more, and in a plurality of welding regions 1212, any welding region 1212 has the same pitch as the adjacent welding region 1212. Preferably, the number of the welding areas 1212 is four, and the four welding areas 1212 can ensure the tensile strength of the tab 120 and reduce the impedance between the tab 120 and the pole piece 110 as much as possible.
With continued reference to fig. 4, in some embodiments, the tab 120 has a first surface 120a, a second surface 120b, and a third surface 120 c.
In this embodiment, the first surface 120a is defined as a surface of the tab 120 facing the pole piece 110, the first surface 120a of the abutting region 1211 abuts against the pole piece 110, and the first surface 120a of the welding region 1212 is welded to the pole piece 110. The second surface 120b is defined as the surface of the tab 120 facing away from the pole piece 110, and the second surface 120b is disposed opposite to the first surface 120 a. When welding, the laser beam emitted by the laser welding device is directed to the second surface 120b, and the heat of the laser beam is conducted to the first surface 120a so that the first surface 120a is melted with the pole piece 110. The third surface 120c is a surface of a sidewall of the tab 120, i.e., a surface in a thickness direction, and the third surface 120c connects the first surface 120a and the second surface 120b, and in order to prevent the tab 120 from puncturing a membrane or a structural object, the third surface 120c of the fitting portion 121 at an end away from the protruding portion 122 is a smooth surface. The smooth surface may be formed by any method known in the mechanical field, such as stamping or grinding, or forming a mold to form the tab 120 with a smooth surface.
As shown in fig. 5, in some embodiments, in order to prevent the tab 120 from piercing the case inside the battery, the third surface 120c of the end of the protruding portion 122 away from the fitting portion 121 is a smooth surface. The sharp corner of the tab 120 is replaced by a smooth surface in the embodiment, so that the safety of the battery cell is improved, and the tab 120 in the embodiment is suitable for processes such as a lithium ion cylindrical battery cell and a lithium ion soft package battery cell.
As shown in fig. 6-7, in some embodiments, the smooth surface may be a curved surface or a combination of curved and flat surfaces. Preferably, the smooth surface is a semicircular arc surface. It should be noted that the connection between the third surface 120c and the first surface 120a and the second surface 120b is preferably a smooth surface, which can further prevent the tab 120 from piercing the pole piece 110. The pole piece 110 may be ground or chamfered on a straight edge, for example.
A second aspect of the embodiments of the present application provides a lithium ion battery, which includes a casing and the battery cell pole group 100 described in any one of the above embodiments. The casing may be an aluminum casing or a steel casing, and the battery cell pole group 100 is located in the casing.
As shown in fig. 8, a third aspect of the embodiment of the present application provides a method for welding a tab 120, including the steps of:
arranging the tab 120 corresponding to the pole piece 110; specifically, the tab 120 may be moved above the pole piece 110 and placed on the pole piece 110, a portion of the tab 120 abuts against the pole piece 110, a portion of the tab 120 abutting against the pole piece 110 is an attaching portion 121, and a portion of the tab 120 not contacting the pole piece 110 is an extending portion 122.
The tab 120 is laser welded at intervals along the length direction of the tab 120 to form a plurality of alternately arranged abutting regions 1211 and welding regions 1212 in the length direction of the tab 120, the abutting regions 1211 and the welding regions 1212 are both located at the joint portion 121 of the tab 120, the abutting regions 1211 abuts against the pole piece 110, and the welding regions 1212 are laser welded with the pole piece 110. Specifically, a laser beam may be directed at the second surface 120b of the tab 120, and the energy of the laser beam penetrates through the tab 120, so that the first surface 120a of the tab 120 melts and is welded with the pole piece 110.
In some embodiments, the area between two adjacent welding areas 1212 on the tab 120 is an abutting area 1211, and after the step of disposing the tab 120 corresponding to the pole piece 110, the method further includes: the abutment region 1211 is pressed against the pole piece 110. Specifically, the abutting region 1211 may be pressed against the pole piece 110 by using a plurality of pressing blocks, and the plurality of pressing blocks respectively press against a plurality of different abutting regions 1211. One pressing block may be provided, and one pressing block has a plurality of pressing portions which respectively press the plurality of different contact regions 1211. In order to make the tab 120 and the pole piece 110 have a good fit, a pulling force may be applied to both ends of the tab 120 in advance to make the tab 120 in a straightened state, and then the tab 120 is placed on the pole piece 110.
In some embodiments, each of the bonding areas 1212 includes a plurality of bonding points 1213. The welding spots 1213 are formed by laser welding, which is fusion welding, so that the tab 120 and the pole piece 110 can be welded more firmly, and simultaneously, the tab 120 and the pole piece 110 are fused together, so that the impedance between the tab 120 and the pole piece 110 is smaller.
In some embodiments, the plurality of solder points 1213 may be arranged in a matrix, a circle, or a line. Preferably, the number of the plurality of welding spots 1213 in each of the welding areas 1212 is 16, and the 16 welding spots 1213 are arranged in a matrix of four rows and four columns.
In some embodiments, the number of the welding regions 1212 may be one or more, and in a plurality of welding regions 1212, a pitch between any one welding region 1212 and an adjacent welding region 1212 is the same. Preferably, the number of the welding areas 1212 is four, and the four welding areas 1212 can ensure the tensile strength of the tab 120 and reduce the impedance between the tab 120 and the pole piece 110 as much as possible.
In some embodiments, the tab 120 has a first surface 120a, a second surface 120b and a third surface 120 c. In this embodiment, the first surface 120a is defined as a surface of the tab 120 facing the pole piece 110, the first surface 120a of the abutting region 1211 abuts against the pole piece 110, and the first surface 120a of the welding region 1212 is welded to the pole piece 110. The second surface 120b is defined as the surface of the tab 120 facing away from the pole piece 110, and the second surface 120b is disposed opposite to the first surface 120 a. During welding, the laser beam emitted by the laser welding device is directed to the second surface 120b, and the heat of the laser beam is conducted to the first surface 120a to melt the first surface 120a and the pole piece 110. The third surface 120c is a surface of a sidewall of the tab 120, i.e., a surface in a thickness direction, and the third surface 120c connects the first surface 120a and the second surface 120b, and in order to prevent the tab 120 from puncturing the diaphragm, the third surface 120c of the fitting portion 121 at an end away from the protruding portion 122 is a smooth surface. The smooth surface may be formed by any method known in the mechanical field, such as stamping or grinding, or forming a mold to form the tab 120 with a smooth surface.
In some embodiments, in order to prevent the tab 120 from piercing the case inside the battery, the third surface 120c of the end of the protruding portion 122 away from the fitting portion 121 is a smooth surface.
In some embodiments, the smooth surface may be a curved surface or a combination of a curved surface and a flat surface. Preferably, the smooth surface is a semicircular arc surface. It should be noted that the connection between the third surface 120c and the first surface 120a and the second surface 120b is preferably a smooth surface, which can further prevent the tab 120 from piercing the pole piece 110. The pole piece 110 may be ground or chamfered on a straight edge, for example.
In order to verify the internal resistance and the welding tension of different welding modes, the following examples and comparative examples are illustrated by using N6 nickel tapes for the tabs 120, the Ni% is 99.5-99.6%, the length of the tab 120 is 70mm, the width of the tab 120 is 3mm, the thickness of the tab 120 is 0.08mm, the distance between adjacent welding regions 1212 is 10mm ± 1.5mm, each welding point 1213 may be a groove, the depth of the groove is 0.005mm, and the planar projection area of each welding point 1213 perpendicular to the depth direction of the groove is 0.3mm2±0.05mm2。
In the first embodiment, 2 welding areas 1212 arranged at intervals are uniformly distributed and welded on the tab 120 and the pole piece 110, each welding area 1212 arranged at intervals has 16 welding points 1213, and the arrangement of the welding points 1213 is 4 × 4 matrix arrangement. According to tests, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 30m Ω, and the welding tension is 2.4 kg.
In the second embodiment, 3 welding areas 1212 arranged at intervals are uniformly distributed and welded on the tab 120 and the pole piece 110, each welding area 1212 arranged at intervals has 16 welding points 1213, and the arrangement of the welding points 1213 is 4 × 4 matrix arrangement. In this example, the internal resistance between the tab 120 and the pole piece 110 was tested to be 28m Ω, and the welding tension was 2.5 kg.
In the third embodiment, 4 welding areas 1212 arranged at intervals are uniformly distributed and welded on the tab 120 and the pole piece 110, each welding area 1212 arranged at intervals has 16 welding points 1213, and the arrangement of the welding points 1213 is 4 × 4 matrix arrangement. According to tests, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 25m Ω, and the welding tension is 2.8 kg.
In the fourth embodiment, 5 welding areas 1212 arranged at intervals are welded to the tab 120 and the pole piece 110 in a uniformly distributed manner, each welding area 1212 arranged at intervals has 16 welding points 1213, and the arrangement of the welding points 1213 is 4 × 4 matrix arrangement. According to tests, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 27m Ω, and the welding tension is 2.9 kg.
In the fifth embodiment, 6 welding areas 1212 arranged at intervals are welded to the tab 120 and the pole piece 110 in a uniformly distributed manner, each welding area 1212 arranged at intervals has 16 welding points 1213, and the arrangement of the welding points 1213 is 4 × 4 matrix arrangement. In this example, the internal resistance between the tab 120 and the pole piece 110 was tested to be 28m Ω, and the welding tension was 3.0 kg.
In the first comparative example, the portions of the tabs 120 contacting the pole piece 110 are integrally welded to the pole piece 110 by ultrasonic welding. According to the test, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 33m Ω, and the welding tension is 3.0 kg.
It can be seen that when the tab 120 is partially welded to the pole piece 110, the internal resistance between the tab 120 and the pole piece 110 is relatively small, and especially when the number of the welding areas 1212 between the tab 120 and the pole piece 110 is 4, the internal resistance is relatively minimum.
In the sixth embodiment, 4 welding areas 1212 arranged at intervals are welded to the tab 120 and the pole piece 110 in a uniformly distributed manner, each welding area 1212 arranged at intervals has 9 welding points 1213, and the arrangement of the welding points 1213 is 3 × 3 matrix arrangement. According to tests, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 30m Ω, and the welding tension is 2.4 kg.
In the sixth embodiment, 4 welding areas 1212 arranged at intervals are welded to the tab 120 and the pole piece 110 in a uniformly distributed manner, each welding area 1212 arranged at intervals has 12 welding points 1213, and the arrangement of the welding points 1213 is 3 × 4 matrix arrangement. According to tests, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 29m Ω, and the welding tension is 2.5 kg.
In the seventh embodiment, 4 welding areas 1212 arranged at intervals are welded to the tab 120 and the pole piece 110 in a uniformly distributed manner, each welding area 1212 arranged at intervals has 15 welding points 1213, and the arrangement of the welding points 1213 is 3 × 5 matrix arrangement. According to tests, in the embodiment, the internal resistance between the tab 120 and the pole piece 110 is 27m Ω, and the welding tension is 2.7 kg.
In the eighth embodiment, 4 welding areas 1212 arranged at intervals are welded to the tab 120 and the pole piece 110 in a uniformly distributed manner, each welding area 1212 arranged at intervals has 20 welding points 1213, and the arrangement of the welding points 1213 is 4 × 5 matrix arrangement. In this example, the internal resistance between the tab 120 and the pole piece 110 was tested to be 28m Ω, and the welding tension was 2.8 kg.
It can be seen that the number of the welding areas 1212 between the tab 120 and the pole piece 110 is 4, each welding area 1212 having 16 welding points 1213 is provided at an interval, and the arrangement of the welding points 1213 is 4 × 4, the internal resistance is relatively small.
In summary, the embodiment of the invention can ensure welding reliability (welding tension is greater than 2.5 kg) and also ensure welding consistency of each welding point 1213 by laser welding, so that impedance between the tab 120 and the pole piece 110 is relatively low, and stable current transmission is ensured. When the number of the welding areas 1212 between the tab 120 and the pole piece 110 is 4, each welding area 1212 provided at an interval has 16 welding points 1213, and the arrangement of the welding points 1213 is a matrix arrangement of 4X4, the internal resistance between the tab 120 and the pole piece 110 is reduced by about 30% compared with the internal resistance during the conventional ultrasonic welding.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A cell pole group, comprising:
pole pieces;
utmost point ear, including laminating portion and with the extension that laminating portion connects, the extension with the pole piece interval sets up, laminating portion includes a plurality of edges the butt region and the welding area that utmost point ear length direction set up in turn, the butt region with the pole piece butt, the welding area with pole piece laser welding.
2. The cell pole group of claim 1, wherein each of the weld regions comprises a plurality of weld spots; each solder joint includes a recess.
3. The cell pole group of claim 1, wherein each of the welding areas comprises four rows and four columns of welding spots arranged in a matrix.
4. The cell pole group of claim 2 or 3, wherein the number of the welding areas is four, and the distance between any one welding area and the adjacent welding area is the same among the four welding areas.
5. The cell pole group of claim 1, wherein the tab has:
a first surface adjacent to one side of the pole piece, the first surface of the abutting region abutting against the pole piece, the first surface of the welding region being welded to the pole piece;
a second surface disposed opposite the first surface;
and the third surface is connected with the first surface and the second surface, and the third surface at one end, away from the extending part, of the attaching part is a smooth cambered surface.
6. The cell pole group of claim 5, wherein the third surface of the end of the protrusion away from the attachment portion is a smooth arc.
7. A lithium ion battery, comprising:
a housing; and
the cell pole set of any of claims 1-6, located within the housing.
8. A tab welding method is characterized by comprising the following steps:
arranging the lug corresponding to the pole piece;
and laser welding is carried out on the spacing of the lugs along the length direction of the lugs so as to form a plurality of alternately arranged abutting areas and welding areas in the length direction of the lugs, wherein the abutting areas are abutted to the pole pieces, and the welding areas are laser welded with the pole pieces.
9. The tab welding method according to claim 8, wherein a region between two adjacent welding regions on the tab is an abutting region, and after the step of arranging the tab corresponding to the pole piece, the method further comprises: compressing the abutment region to the pole piece.
10. The tab welding method as claimed in claim 8 or 9, wherein the number of the welding areas is four, and each of the welding areas includes four rows and four columns of the welding spots arranged in a matrix.
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|---|---|---|---|
| CN202210328988.9A CN114696045A (en) | 2022-03-31 | 2022-03-31 | Battery cell pole group, lithium ion battery and pole lug welding method |
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| CN202210328988.9A CN114696045A (en) | 2022-03-31 | 2022-03-31 | Battery cell pole group, lithium ion battery and pole lug welding method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2862341Y (en) * | 2005-10-09 | 2007-01-24 | 比亚迪股份有限公司 | Battery pole-ear and battery within same |
| CN105024033A (en) * | 2015-07-20 | 2015-11-04 | 无锡市百事杰金属制品科技有限公司 | Tab of lithium-ion battery with two conductors |
| CN207868261U (en) * | 2017-12-22 | 2018-09-14 | 惠州亿纬锂能股份有限公司 | A kind of lithium ion battery |
| WO2019148463A1 (en) * | 2018-02-02 | 2019-08-08 | 深圳前海优容科技有限公司 | Terminal tab for use in cylindrical battery and cylindrical battery |
| CN113131008A (en) * | 2021-04-13 | 2021-07-16 | 宁波超霸能源有限公司 | Method for forming wound product |
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2022
- 2022-03-31 CN CN202210328988.9A patent/CN114696045A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2862341Y (en) * | 2005-10-09 | 2007-01-24 | 比亚迪股份有限公司 | Battery pole-ear and battery within same |
| CN105024033A (en) * | 2015-07-20 | 2015-11-04 | 无锡市百事杰金属制品科技有限公司 | Tab of lithium-ion battery with two conductors |
| CN207868261U (en) * | 2017-12-22 | 2018-09-14 | 惠州亿纬锂能股份有限公司 | A kind of lithium ion battery |
| WO2019148463A1 (en) * | 2018-02-02 | 2019-08-08 | 深圳前海优容科技有限公司 | Terminal tab for use in cylindrical battery and cylindrical battery |
| CN113131008A (en) * | 2021-04-13 | 2021-07-16 | 宁波超霸能源有限公司 | Method for forming wound product |
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