CN215418507U - Tab structure and battery - Google Patents
Tab structure and battery Download PDFInfo
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- CN215418507U CN215418507U CN202121753174.7U CN202121753174U CN215418507U CN 215418507 U CN215418507 U CN 215418507U CN 202121753174 U CN202121753174 U CN 202121753174U CN 215418507 U CN215418507 U CN 215418507U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application provides a utmost point ear structure and battery, wherein, utmost point ear structure is including the utmost point ear, foil and the screening glass that stack gradually the setting. The tab, the foil and the protection plate are provided with welding areas, the welding areas comprise welding holes, and the tab, the foil and the protection plate are connected through the welding holes. In this application embodiment, utmost point ear structure is including the utmost point ear, the foil and the screening glass of range upon range of setting gradually. The tab, the foil and the protection plate are provided with welding areas, the welding areas comprise welding holes, and the tab, the foil and the protection plate are connected through the welding holes. Make utmost point ear, foil and screening glass welding together through welding the hole, make utmost point ear, foil and screening glass compare because of the mode that high frequency vibration fuses together with the mode through ultrasonic bonding among the prior art, foil fracture possibility is less to the utmost point ear structure that this application embodiment provided has reduced the easy cracked risk of foil in welding process.
Description
Technical Field
The application relates to the field of lithium ion batteries, in particular to a tab structure and a battery.
Background
With the rapid development of lithium ion battery technology, lithium ion batteries are more and more widely applied to portable mobile electronic devices such as notebook computers and smart phones. At present, in the welding technology of the lithium ion battery tab, a plurality of layers of foils are welded together usually by means of ultrasonic welding, the ultrasonic welding is transmitted to the surface of an object to be welded by means of high-frequency vibration waves, and the surfaces of the object are mutually rubbed under the condition of pressurization to form fusion between molecular layers. In this way, when the number of layers of the foil is too large, the frequency of the high-frequency vibration wave needs to be increased to realize fusion between the foils, but the foil is easy to break when vibrating at a higher frequency, and the risk of insufficient soldering exists.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a utmost point ear structure and battery, has solved the easy cracked problem of foil in welding process.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a tab structure, which includes a tab, a foil, and a protection sheet, which are sequentially stacked;
utmost point ear the foil with be equipped with the welding area in the screening glass, the welding area is including welding the hole, utmost point ear the foil with the screening glass passes through weld the hole and connect.
Optionally, the utmost point ear with all be equipped with first glue film on the protection piece, the length scope of first glue film is 10mm to 200mm, the width scope of first glue film is 3mm to 10mm, first glue film surpasss the utmost point ear with the length scope of protection piece is 0.5mm to 10mm, first glue film surpasss the utmost point ear with the width scope of protection piece is 0.5mm to 50 mm.
Optionally, the soldering region further comprises at least two solder imprints distributed on the protective sheet, the maximum width of the solder imprints being in the range of 10 μm to 2000 μm.
Optionally, the at least two solder prints are distributed in an array on the protective sheet.
Optionally, the solder printing edge has a bump, and the depth of the solder hole is greater than or equal to twice the height of the bump.
Optionally, the thickness of the protective sheet ranges from 0.1mm to 1 mm.
Optionally, the length of the protective sheet ranges from 5mm to 65mm, and the width of the protective sheet ranges from 2mm to 10 mm.
Optionally, the weld hole is a cone.
In a second aspect, an embodiment of the present application further provides a battery, the battery includes an electric core and the tab structure as in the first aspect, a second glue layer is disposed on the electric core, the second glue layer is adjacent to the first glue layer, a length range of the second glue layer is 10mm to 200mm, a width range of the second glue layer is 0mm to 100mm, and a length range of the second glue layer beyond the electric core is 3mm to 15 mm.
Optionally, the tab in the tab structure comprises a hard tab and a soft tab, and the included angle between the hard tab and the soft tab ranges from 45 degrees to 135 degrees.
In this application embodiment, utmost point ear structure is including the utmost point ear, the foil and the screening glass of range upon range of setting gradually. The tab, the foil and the protection plate are provided with welding areas, the welding areas comprise welding holes, and the tab, the foil and the protection plate are connected through the welding holes. Make utmost point ear, foil and screening glass welding together through welding the hole, make utmost point ear, foil and screening glass compare because of the mode that high frequency vibration fuses together with the mode through ultrasonic bonding among the prior art, foil fracture possibility is less to the utmost point ear structure that this application embodiment provided has reduced the easy cracked risk of foil in welding process.
Drawings
For a clear explanation of the technical solutions in the embodiments of the present application, the drawings of the specification are described below, it is obvious that the following drawings are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the listed drawings without any inventive effort.
Fig. 1 is one of schematic structural diagrams of a tab structure provided in an embodiment of the present application;
fig. 2 is a second schematic structural diagram of a tab structure provided in an embodiment of the present application;
fig. 3 is a third schematic structural diagram of a tab structure provided in an embodiment of the present application;
fig. 4 is a fourth schematic structural diagram of a tab structure provided in the embodiment of the present application;
fig. 5 is a fifth schematic structural view of a tab structure provided in the embodiment of the present application;
fig. 6 is a sixth schematic structural view of a tab structure provided in an embodiment of the present application;
fig. 7 is a seventh schematic structural diagram of a tab structure provided in an embodiment of the present application;
fig. 8 is an eighth schematic structural diagram of a tab structure provided in an embodiment of the present application;
fig. 9 is a ninth schematic structural diagram of a tab structure provided in an embodiment of the present application;
fig. 10 is a tenth of a schematic structural diagram of a tab structure provided in an embodiment of the present application;
fig. 11 is an eleventh schematic structural diagram of a tab structure provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. On the basis of the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present application.
In the prior art, in a tab welding technology of a lithium ion battery, a plurality of layers of foils are welded together in an ultrasonic welding mode, the ultrasonic welding is transmitted to the surface of an object to be welded by using high-frequency vibration waves, and the surfaces of the object are mutually rubbed under the condition of pressurization to form fusion between molecular layers. In this way, when the number of layers of the foil is too large, the frequency of the high-frequency vibration wave needs to be increased to realize fusion between the foils, but the foil is easy to break when vibrating at a higher frequency, and the risk of insufficient soldering exists. In addition, the ultrasonic vibration generates heat, which causes severe abrasion of the welding head holder. And if the multilayer foil is prewelded in an ultrasonic welding mode and then the multilayer foil and the lug are welded together in a laser welding mode, the welding flatness is poor in the ultrasonic prewelding process, so that the effective welding area is small during laser welding, and the problem of poor overcurrent capacity of the lithium ion battery is caused.
In order to solve at least one of the above problems, referring to fig. 3 and 7, an embodiment of the present application provides a tab structure, which includes a tab 4, a foil 3, and a protection sheet 2, which are sequentially stacked;
It is to be understood that the weld hole may be formed by melting the tab 4, the foil 9 and the protective sheet 2 by irradiation of a laser beam, or other heat source. The thickness of the tab 4 ranges from 0.04mm to 1mm, the width of the tab 4 ranges from 5mm to 80mm, the material of the foil 3 is usually aluminum or copper, and the thickness of the foil 3 ranges from 0.004mm to 0.03 mm. The number of layers of the foil 3 may be one or more, for example, the number of layers of the foil 3 may be in the range of 15 to 200. The material of the protection sheet 2 comprises at least one of stainless steel, nickel, copper nickel plating, copper and aluminum. That is, the protective sheet 2 may be made of any one of stainless steel, nickel-plated copper, copper and aluminum, or a mixture of any one of stainless steel, nickel-plated copper, copper and aluminum. The width of the lands is typically 0.5mm to 5mm and the length of the lands is typically 5mm to 80 mm. The protective sheet is required to cover the entire welding area, optionally the length of the protective sheet ranges from 5mm to 65mm, and the width of the protective sheet ranges from 2mm to 10mm
In this application embodiment, utmost point ear structure is including the utmost point ear, the foil and the screening glass of range upon range of setting gradually. The tab, the foil and the protection plate are provided with welding areas, the welding areas comprise welding holes, and the tab, the foil and the protection plate are connected through the welding holes. Make utmost point ear, foil and screening glass welding together through welding the hole, make utmost point ear, foil and screening glass compare because of the mode that high frequency vibration fuses together with the mode through ultrasonic bonding among the prior art, foil fracture possibility is less to the utmost point ear structure that this application embodiment provided has reduced the easy cracked risk of foil in welding process.
Optionally, referring to fig. 5 and 10, the surface of the land may be further provided with a protective paste 5. Protection is glued 5 including setting up the first glue film on utmost point ear and screening glass and setting up the second glue film on battery electricity core, utmost point ear with all be equipped with first glue film on the screening glass, the length scope of first glue film is 10mm to 200mm, the width scope of first glue film is 3mm to 10 mm. First glue film can be adhesive tape, first glue film surpasss utmost point ear with the length scope of screening sheet is 0.5mm to 10mm, first glue film surpasss utmost point ear with the width scope of screening sheet is 0.5mm to 50 mm.
Optionally, the weld hole is a cone. In the case where the weld hole is a cone, the burr generated from the weld hole is less. Excessive burrs can affect battery performance. Illustratively, the welding area may be irradiated with a laser beam 1 to form a welding zone including a welding hole through which the tab 4, the foil 3, and the protective sheet 2 are welded. The welding zone may also comprise a weld imprint, which may penetrate the tab 4, the foil 3 and the protection sheet 2, leaving a weld imprint on both the protection sheet 2 and the tab 4.
Optionally, the soldering zone further comprises at least two solder imprints distributed on the protective sheet 2, the maximum width of the solder imprints ranging from 10 μm to 2000 μm.
Specifically, the welding area is irradiated with a laser beam 1, or the welding area is heated by a heat source to form a weld hole, and simultaneously, a weld mark is formed on the protective sheet 2 and/or the tab 4. For example, the welding area may be irradiated with the laser beams 1 simultaneously to form a plurality of welding marks on the protective sheet 2 and/or the tab 4 simultaneously, or the welding area may be irradiated with the laser beams 1 a plurality of times to form a plurality of welding marks on the protective sheet 2 and/or the tab 4 in separate steps. Theoretically, the more weld marks and weld holes that are formed, the more reliable the connection between the protective sheet 2, the foil 3 and the tab 4. The number of the welding marks can be reasonably set according to the size of the welding area, so that the connection among the protection plate 2, the foil 3 and the lug 4 is more reliable.
The shape of the footprint may be any shape, for example the footprint may be circular, in which case the diameter of the footprint may range from 10 μm to 2000 μm.
The solder prints may be regularly arranged on the protective sheet 2, and/or the tab 4, or may be irregularly arranged. Alternatively, when there are at least two solder marks on the protective sheet 2, the at least two solder marks are distributed in an array on the protective sheet 2.
Optionally, the solder printing edge has a bump, and the depth of the solder hole is greater than or equal to twice the height of the bump. Illustratively, the depth of the solder hole is larger than 300 μm, the edge of the solder print has a small amount of flash to form a bump, and the height of the bump is smaller than 150 μm. The depth of the solder hole is greater than or equal to twice the height of the bump.
It should be understood that the tab structure provided by the embodiments of the present application may be manufactured by the following method:
firstly, sequentially stacking a tab 4, a foil 3 and a protection sheet 2;
then, a pressing member is placed on the protective sheet 2 except for the welding area;
finally, will compressing tightly the piece will utmost point ear 4 foil 3 with under the circumstances that screening glass 2 compressed tightly, utilize laser beam 1 to shine welding area forms the welding area, the welding area is including welding the hole, utmost point ear 4 foil 3 with screening glass 2 passes through weld the hole welding.
It is to be understood that the manner in which welding is effected by irradiating the welding area with the laser beam 1 to form a weld zone is not limited to the number of layers of the foil 3. Since the foils 3 are extremely thin, when a plurality of foils 3 are stacked, a large gap may exist between adjacent foils 3. Arrange above-mentioned protection sheet 2 on foil 3, and cover foil 3 completely, and place on protection sheet 2 through compressing tightly the piece, can compress tightly utmost point ear 4, foil 3 and protection sheet 2 to there is not the clearance between the adjacent foil 3, contact each other completely.
The thickness of the protective sheet 2 is such that the protective sheet 2 has a strength such that the protective sheet 2 can transmit a pressing force uniformly to the entire surface of the foil 3 when the pressing member is applied to the other regions of the protective sheet 2 than the welding region. However, the thickness of the protective sheet 2 should not be too thick, and the excessively thick protective sheet 2 may occupy too much space of the battery cell 6, resulting in a decrease in the energy density of the battery. Experiments show that the thickness of the protective sheet 2 ranges from 0.1mm to 1mm, which can both solve the above two problems. It will be appreciated that the pressing member may be removed from the protective sheet 2 after the welding is completed.
The welding region is a region directly irradiated with the laser beam 1. The welding area may be of any shape theoretically, and when the welding area is rectangular, the width of the welding area ranges from 0.5mm to 5mm, and the length of the welding area ranges from 5mm to 80 mm.
In addition, the utmost point ear structure that this application embodiment provided can directly adopt laser welding's mode to make, directly with screening glass 2, foil 3 and utmost point ear 4 welding together, need not to weld multilayer foil 3 with ultrasonic bonding's mode in advance earlier, and the mode of recycling laser welding is in the same place multilayer foil 3 and utmost point ear 4 welding together. Therefore, the problems that the welding flatness is poor in the ultrasonic prewelding process, the effective welding area is small in the laser welding process, and the overcurrent capacity of the lithium ion battery is poor are solved.
Furthermore, the pole lug structure provided by the embodiment of the application can be directly welded in a laser welding mode, so that the problems of serious abrasion of a welding head welding seat, unstable welding process and insufficient welding caused by ultrasonic welding are solved.
The following describes a method for manufacturing a tab structure provided in an embodiment of the present application with two examples.
First, as a first step, see fig. 1, a protective sheet 2 is placed, the protective sheet 2 is placed over the foil 3, the protective sheet 2 being required to cover the entire welding area;
secondly, referring to fig. 2, the foil 3 is placed, and the battery cell 6 is placed above the protective sheet 2;
thirdly, referring to fig. 3, placing a tab 4, wherein the thickness of the tab 4 can be 0.04-1mm, the width of the tab 4 can be 5-65mm, and the width of the tab 4 can be greater than, equal to or less than the width of the foil 3;
a fourth step of irradiating the welding area with a laser beam 1 to form a welding area including welding holes through which the tab 4, the foil 3, and the protection sheet 2 are welded, while compressing the tab 4, the foil 3, and the protection sheet 2 by a compressing member, referring to fig. 4;
and fifthly, sticking glue, namely sticking protective glue 5 on the upper surface and the lower surface of the welding and printing area.
Example one although welding of the tab 4, the foil 3, and the protective sheet 2 may also be performed, it is possible to place the tab 4 on the uppermost layer, and the laser beam 1 directly irradiates the tab 4, so that the heat input is large and there is a risk of melting the glue of the tab 4. And as an example, the welded tab 4 is not bent, which results in space waste and thus reduces the energy density of the battery.
So the present application further provides an example two, first step, see fig. 6, of placing the tab 4, where the tab 4 has a thickness in the range of 0.04-1mm and a width in the range of 5-65mm, and the tab 4 may have a width greater than, equal to, or less than the width of the foil 3;
secondly, referring to fig. 7, the foil 3 is placed, and the battery cell 6 is placed above the tab 4;
thirdly, referring to fig. 8, the protection sheet 2 is placed above the foil 3, and the protection sheet 2 needs to cover the whole welding area;
a fourth step of irradiating the welding area with a laser beam 1 to form a welding area including welding holes through which the tab 4, the foil 3, and the protection sheet 2 are welded, while compressing the tab 4, the foil 3, and the protection sheet 2 by a compressing member, referring to fig. 9;
fifthly, referring to fig. 10, gluing, namely gluing the upper surface and the lower surface of the welding and printing area with protective glue 5;
sixthly, referring to fig. 11, bending the tab 4, and bending the welded tab 4, wherein an angle between a hard tab of the tab 4 and a soft tab of the tab 4 is about 90 °, and the bent tab 4 is as shown in fig. 11.
In the second example, the protection sheet 2 is placed on the uppermost layer, and the laser beam 1 directly irradiates the protection sheet 2, so that the problem that the tab 4 is directly irradiated by the laser beam 1, heat input is large, and the risk of melting the glue of the tab 4 exists. In addition, the welded tab 4 is bent, so that the space is saved, and the energy density of the battery can be improved.
The embodiment of the application further provides a battery, the battery includes electric core and the utmost point ear structure that this embodiment of the application provided, is equipped with the second glue film on the electric core, the second glue film borders on with first glue film, the length range of second glue film is 10mm to 200mm, the width scope of second glue film is 0mm to 100mm, and the second glue film also can be for the adhesive tape, the second glue film surpasss the length scope of electric core is 3mm to 15mm, and in the width direction, the second glue film does not surpass electric core. The structure and the working principle of the tab structure provided by the embodiment of the application can refer to the above embodiments, and are not repeated herein. Because the battery that this application embodiment provided includes the utmost point ear structure that this application embodiment provided, consequently have the whole beneficial effect of the utmost point ear structure that this application embodiment provided.
Optionally, referring to fig. 11, the tabs in the tab structure include a hard tab and a soft tab, and an included angle between the hard tab and the soft tab ranges from 45 degrees to 135 degrees. The tab in the tab structure is bent, so that the length of the tab structure can be reduced, and the internal space of the battery can be saved.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A tab structure is characterized by comprising a tab, a foil and a protection sheet which are sequentially stacked;
utmost point ear the foil with be equipped with the welding area in the screening glass, the welding area is including welding the hole, utmost point ear the foil with the screening glass passes through weld the hole and connect.
2. The tab structure as claimed in claim 1, wherein a first glue layer is disposed on each of the tab and the protection sheet, the first glue layer has a length ranging from 10mm to 200mm, a width ranging from 3mm to 10mm, the first glue layer exceeds the tab and the protection sheet by 0.5mm to 10mm, and the first glue layer exceeds the tab and the protection sheet by 0.5mm to 50 mm.
3. The tab structure of claim 1, wherein the weld zone further comprises at least two weld imprints distributed on the protective sheet, the weld imprints having a maximum width in a range of 10 μ ι η to 2000 μ ι η.
4. The tab structure of claim 3, wherein the at least two solder prints are distributed in an array on the protective sheet.
5. The tab structure of claim 3, wherein the weld printed edge is raised, and the depth of the weld hole is greater than or equal to twice the height of the raised edge.
6. The tab structure of claim 1, wherein the protective sheet has a thickness ranging from 0.1mm to 1 mm.
7. The tab structure of claim 1, wherein the protective sheet has a length ranging from 5mm to 65mm and a width ranging from 2mm to 10 mm.
8. The tab structure of claim 1, wherein the weld hole is a cone.
9. A battery, characterized in that, the battery comprises a battery core and the tab structure of any one of claims 1 to 8, the battery core is provided with a second glue layer, the second glue layer is adjacent to the first glue layer, the length of the second glue layer ranges from 10mm to 200mm, the width of the second glue layer ranges from 0mm to 100mm, and the length of the second glue layer beyond the battery core ranges from 3mm to 15 mm.
10. The battery of claim 9, wherein the tabs in the tab structure comprise a hard tab and a soft tab, and an included angle between the hard tab and the soft tab ranges from 45 degrees to 135 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121753174.7U CN215418507U (en) | 2021-07-29 | 2021-07-29 | Tab structure and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121753174.7U CN215418507U (en) | 2021-07-29 | 2021-07-29 | Tab structure and battery |
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| CN215418507U true CN215418507U (en) | 2022-01-04 |
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| CN202121753174.7U Active CN215418507U (en) | 2021-07-29 | 2021-07-29 | Tab structure and battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113451712A (en) * | 2021-07-29 | 2021-09-28 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| CN116586851A (en) * | 2023-07-17 | 2023-08-15 | 宁德时代新能源科技股份有限公司 | Structural member, manufacturing method thereof, battery monomer, battery and electric equipment |
-
2021
- 2021-07-29 CN CN202121753174.7U patent/CN215418507U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113451712A (en) * | 2021-07-29 | 2021-09-28 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| CN113451712B (en) * | 2021-07-29 | 2024-04-09 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| CN116586851A (en) * | 2023-07-17 | 2023-08-15 | 宁德时代新能源科技股份有限公司 | Structural member, manufacturing method thereof, battery monomer, battery and electric equipment |
| CN116586851B (en) * | 2023-07-17 | 2023-11-21 | 宁德时代新能源科技股份有限公司 | Structural member, manufacturing method thereof, battery monomer, battery and electric equipment |
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