CN116727830A - Welding method and welding apparatus - Google Patents
Welding method and welding apparatus Download PDFInfo
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- CN116727830A CN116727830A CN202310931000.2A CN202310931000A CN116727830A CN 116727830 A CN116727830 A CN 116727830A CN 202310931000 A CN202310931000 A CN 202310931000A CN 116727830 A CN116727830 A CN 116727830A
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- 238000003466 welding Methods 0.000 title claims abstract description 226
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 94
- 239000011888 foil Substances 0.000 claims abstract description 51
- 238000007493 shaping process Methods 0.000 claims abstract description 50
- 238000001125 extrusion Methods 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract 3
- 230000007246 mechanism Effects 0.000 claims description 146
- 238000001514 detection method Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 14
- 230000006698 induction Effects 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 4
- 229910052751 metal Inorganic materials 0.000 abstract description 21
- 239000002184 metal Substances 0.000 abstract description 21
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 15
- 238000009826 distribution Methods 0.000 description 8
- 238000003825 pressing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 229910000679 solder Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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
Abstract
The invention provides a welding method and welding equipment, wherein the welding method comprises the following steps: heating the tab to a predetermined temperature range to soften the non-conductive layer; bi-directional extrusion shaping is carried out on the heated tab in the thickness direction of the tab, and part of the non-conductive layer in the tab is extruded to reduce the thickness of the non-conductive layer; placing a foil on the surface of at least one conductive layer; detecting the thickness of the non-conductive layer of the pole ear after extrusion shaping, performing ultrasonic welding if the thickness of the non-conductive layer is within a preset range, and directly recycling after marking if the thickness of the non-conductive layer is outside the preset range. According to the invention, the thickness of the nonmetal layer in the tab is reduced by extrusion before welding, so that the effective welding area of the foil and the metal layer can be enlarged, the required pressure and parameters for subsequent welding are reduced, and the service life of the welding head and the bonding material condition in the welding process are increased.
Description
Technical Field
The invention relates to the technical field of ultrasonic welding, in particular to a welding method and welding equipment.
Background
Ultrasonic welding is to transfer high-frequency vibration waves to the surfaces of two objects to be welded, and under the condition of pressurization, the surfaces of the two objects are rubbed with each other to form fusion between molecular layers.
Traditional metal and nonmetal ultrasonic welding, through the design of profile of tooth mechanism, the welding process can melt nonmetal district fast and extrude to the toothless region, accomplishes metal and nonmetal's welding, because nonmetal's non-electric conductivity, main ability of switching on the electron is accomplished through welding the tooth region. Due to the above reasons, the extrusion of the nonmetal layer is completed in the welding process in the traditional ultrasonic welding, enough accommodating space is required to accommodate and weld the extruded nonmetal layer, and the metal layer, the welding of the metal layer and the nonmetal layer have higher requirements on the levelness of equipment and the design of welding teeth, so that the effective welding area of the metal and the metal is difficult to expand on the basis of considering the welding result.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a welding method and a welding apparatus, which aim to reduce the thickness of a non-metal layer in a tab by extrusion before ultrasonic welding, so that the extrusion amount of the non-metal layer in the ultrasonic welding process can be reduced, and thus, a toothless zone and a tooth zone with a larger area can be formed by welding a horn for ultrasonic welding, and further, the effective welding area of a foil and a metal layer can be enlarged.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a welding method for welding a tab, the tab including a non-conductive layer and conductive layers coated on both sides of the non-conductive layer, the welding method comprising: heating the tab to a predetermined temperature range to soften the non-conductive layer; bi-directional extrusion molding is carried out on the heated tab in the thickness direction of the tab, and a part of the non-conductive layer in the tab is extruded to reduce the thickness of the non-conductive layer; placing a foil on the surface of at least one conductive layer; detecting the thickness of the non-conductive layer of the tab after extrusion shaping, performing ultrasonic welding if the thickness of the non-conductive layer is within a preset range, and directly recycling after marking if the thickness of the non-conductive layer is outside the preset range.
For example, in the welding method provided in at least one embodiment of the present invention, the moving path of the tab is adjusted by the coil tension adjusting device, so that the tab is positioned on the same straight line during heating, extrusion shaping, foil placement, inspection and ultrasonic welding.
For example, in the welding method according to at least one embodiment of the present invention, the tension of the tab is adjusted by a coil tension adjusting device.
For example, in the welding method provided by at least one embodiment of the present invention, the tab is heated to 90 ℃ to 150 ℃.
For example, in the welding method provided in at least one embodiment of the present invention, the tab is unidirectionally heated by a heating mechanism configured as at least one of a magnetic induction heating device, a hot air heating device, a radiation heating device, an infrared heating device, a microwave heating device, and a hot oil heating device.
The welding equipment is used for welding the tab, the tab comprises a non-conductive layer and conductive layers which are arranged on two sides of the non-conductive layer in a covering mode, and the welding equipment comprises an unreeling mechanism, a heating mechanism, a shaping mechanism, a foil placing mechanism, an ultrasonic welding mechanism and a reeling mechanism; the unreeling mechanism is used for outputting the tab, and the tab sequentially passes through the heating mechanism, the shaping mechanism, the foil placing mechanism, the ultrasonic welding mechanism and the reeling mechanism; the heating mechanism is used for heating the non-conductive layer to a softened state; the shaping mechanism is used for carrying out bidirectional extrusion shaping on the lug in the thickness direction of the lug, and extruding part of the non-conductive layer in the lug to reduce the thickness of the non-conductive layer; the foil placing mechanism is used for placing foil on the surface of at least one conductive layer; the ultrasonic welding mechanism comprises a welding head, wherein the welding head is provided with a welding mark, the welding mark comprises a tooth welding area and a tooth-free area, the tooth welding area is used for welding the conductive layer and the foil, the tooth-free area is used for accommodating and welding the non-conductive layer extruded in the welding process, and the area of the tooth-free area is smaller than that of the tooth welding area; the winding mechanism is used for recycling the tab.
For example, in the welding device provided in at least one embodiment of the present invention, each of the tooth regions in the welding mark is distributed in a matrix.
For example, in the welding device provided by at least one embodiment of the present invention, the welding device further includes a detecting mechanism disposed downstream of the shaping mechanism and upstream of the ultrasonic welding mechanism, the detecting mechanism is configured to detect a thickness of the non-conductive layer of the shaped tab, and if the thickness of the non-conductive layer is within a predetermined range, the tab is recovered to the winding mechanism after being welded; and if the thickness of the non-conductive layer is out of the preset range, marking the tab and directly recycling the tab to the winding mechanism.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the tab moves along a straight path past the heating mechanism, the shaping mechanism, the foil placement mechanism, the detection mechanism, and the ultrasonic welding mechanism.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the unwinding mechanism includes a coil unwinding roller, a coil unwinding driving roller, and a coil tension adjusting device, the coil unwinding roller is adapted to wind a tab coil, the coil unwinding driving roller is used to drive the coil unwinding roller to rotate, the coil tension adjusting device is used to change a moving path of the tab and adjust tension of the tab, the coil tension adjusting device is configured to at least two, a first one of the coil tension adjusting devices is disposed on the moving path of the tab between the coil unwinding roller and the heating mechanism, a second one of the coil tension adjusting devices is disposed on the moving path of the tab between the ultrasonic welding mechanism and the winding mechanism, and the first one, the heating mechanism, the shaping mechanism, the foil placement mechanism, the ultrasonic welding mechanism, and the second one are sequentially disposed along the same straight line.
For example, in the welding apparatus provided by at least one embodiment of the present invention, the heating source of the heating mechanism is configured as at least one of a magnetic induction heating device, a hot air heating device, a radiant heating device, an infrared heating device, a microwave heating device, and a hot oil heating device; and/or
For example, in the welding apparatus provided by at least one embodiment of the present invention, the tab is heated to 90-150 ℃.
For example, in the welding apparatus provided by at least one embodiment of the present invention, the shaping mechanism is located inside or outside the heating area of the heating mechanism.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the shaping mechanism includes two pressing members for respectively performing bidirectional pressing shaping on the tab in a thickness direction thereof, wherein at least one of the pressing members is configured as a circular roller.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the outer peripheral surface of the circular roller is provided with a pattern, or the outer peripheral surface of the circular roller is provided with a smooth surface.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the foil is welded to an upper layer and/or a lower layer of the tab.
Due to the adoption of the technical scheme, the invention has at least the following advantages:
1. according to the welding method and the welding equipment, the thickness of the nonmetal layer in the tab is reduced by extrusion before ultrasonic welding, so that the extrusion amount of the nonmetal layer in the welding process can be reduced, a toothless area with smaller distribution area and a tooth welding area with larger distribution area can be formed by welding and printing of the welding head for ultrasonic welding, the effective welding area of the foil and the metal layer can be enlarged, and the welding effect is more stable.
2. The area of welding between metals is increased, so that the overcurrent capacity of the product is increased.
3. The weld head pressure required during subsequent welding is reduced due to the advanced extrusion of the non-conductive layer.
4. Due to the advanced extrusion of the nonmetallic layer, the overall welding parameters are reduced, and the service life of the welding head is prolonged.
5. The power required for ultrasonic welding can be less adaptable due to the reduction in the welding area between the nonmetal and the metal and the increase in the welding area between the metal and the metal.
Drawings
FIG. 1 is a schematic diagram of a welding method according to at least one embodiment of the present disclosure;
FIG. 2 is a schematic structural view of a tab coil welded by a welding apparatus according to at least one embodiment of the present disclosure;
FIG. 3 is a schematic structural view of a tab in a welding apparatus according to at least one embodiment of the present disclosure;
fig. 4 is a schematic structural view of a tab in a welding device according to at least one embodiment of the present invention after being extruded;
FIG. 5 is a schematic diagram of a welding apparatus according to at least one embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a welding apparatus according to at least one embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a solder print structure of a soldering apparatus according to at least one embodiment of the present disclosure;
fig. 8 is a schematic structural view of a solder mask formed in the comparative example of the present invention.
The reference numerals in the drawings:
10-electrode lugs;
101-a current collector;
1011-conductive layer;
1012-a non-conductive layer;
102-active substance;
1013-a shaped non-conductive layer;
104-foil;
105-welding;
1051-tooth region;
1052-toothless zone;
201-unreeling mechanism;
202-a heating mechanism;
203-a shaping mechanism;
204-a welding mechanism;
205-a winding mechanism;
206-foil unreeling mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "front", "rear", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 7, at least one embodiment of the present invention provides a welding method for welding a tab 10, wherein the tab 10 includes a non-conductive layer 1012 and conductive layers 1011 covering both sides of the non-conductive layer 1012. For example, the welding method includes the following steps S100 to S400.
S100, heating the tab 10 to a preset temperature range to enable the non-conductive layer 1012 to be in a softened state;
s200, extruding and shaping the heated tab 10 in two directions in the thickness direction of the tab 10, and extruding part of the non-conductive layer 1012 in the tab 10 to reduce the thickness of the non-conductive layer 1012;
s300, placing a foil 104 on the surface of at least one conductive layer 1011;
s400, detecting the thickness of the non-conductive layer 1012 of the pole lug 10 after extrusion shaping, performing ultrasonic welding if the thickness of the non-conductive layer 1012 is within a preset range, and directly recycling after marking if the thickness of the non-conductive layer 1012 is outside the preset range.
Wherein, the welding head for ultrasonic welding is formed with a welding mark 105, the welding mark 105 comprises a tooth region 1051 and a toothless region 1052, the tooth region 1051 is used for welding the conductive layer 1011 and the foil 104, the toothless region 1052 is used for accommodating and welding the non-conductive layer 1012 extruded in the welding process, and the distribution area of the toothless region 1052 is smaller than that of the tooth region 1051.
In the welding method of the above embodiment, by reducing the thickness of the nonmetallic layer in the tab 10 by extrusion before ultrasonic welding, in this way, the extrusion amount of the nonmetallic layer in the welding process can be reduced, and thus the horn welding 105 for ultrasonic welding can form the toothless area 1052 with smaller distribution area and the tooth area 1051 with larger distribution area, and further the effective welding area of the foil 104 and the metallic layer can be enlarged, and the welding effect can be made more stable. Further, the area of the weld between metals is increased, thereby increasing the overcurrent capability of the product. Due to the advanced extrusion of the non-conductive layer 1012, the required weld head pressure during subsequent welding is reduced and, at the same time, the overall welding parameters are reduced, increasing the service life of the weld head. Further, since the welding area between the nonmetal and the metal is reduced and the welding area between the metal and the metal is increased, the power required for ultrasonic welding can be less adaptable.
Specifically, in step S100, after the tab 10 is heated to a predetermined temperature, the non-conductive layer 1012 assumes a softened state, so that it can be pressed out from between the conductive layers 1011 on both sides. For example, the non-conductive layer 1012 is configured as plastic. For example, the predetermined temperature is configured as the melting point temperature of the plastic and the bottom temperature + -10deg.C.
For example, in step S200, when the tab 10 is pressed in both directions in the thickness direction of the tab 10 after heating, the conductive layers 1011 on both sides are recessed toward the non-conductive layers 1012 to a certain extent, and then the non-conductive layers 1012 in the vicinity of the recessed portions are pressed out of the tab 10. For example, when the non-conductive layer 1012 is cooled to return to a solid state, the tab 10 is pressed and shaped. It should be noted that, the non-conductive layer 1012 after extrusion molding still has a certain thickness, and the non-conductive layer 1012 can be extruded to the shallow welding beverage area after being melted in the subsequent ultrasonic welding process.
For example, in step S300, the outer conductive layer 1011 places the foil 104 to serve as a tab, for example.
For example, in step S400, the thickness of the non-conductive layer 1012 of the tab 10 after the extrusion is detected by the detecting means, and a predetermined thickness value is set to determine whether the tab 10 is recovered after ultrasonic welding or directly after marking. For example, the predetermined thickness value is set according to the size of the conductive layer 1011, the size of the foil 104, and/or the size of the tooth bonding region 1051 and the tooth-free region 1052.
For example, in the welding method according to at least one embodiment of the present invention, the moving path of the tab 10 is adjusted by the coil tension adjusting device, so that the tab 10 is positioned on the same straight line during heating, extrusion shaping, placing the foil 104, detecting and ultrasonic welding. It will be appreciated that the tab 10 is adjusted to move continuously along a straight path, avoiding turning and tilting of the path during movement of the tab 10, facilitating heating, extrusion shaping, foil 104 placement, inspection, and ultrasonic welding of the tab 10 during movement, for example, improving the accuracy of the results of these operations.
For example, in the welding method according to at least one embodiment of the present invention, the tension of the tab 10 is adjusted by the coil tension adjusting device. In this way, the tab 10 can be kept under sufficient tension during movement, and no loosening or shaking phenomenon can occur, which can facilitate the heating operation, the extrusion shaping operation, the foil 104 placement operation, the detection operation, and the ultrasonic welding operation of the tab 10 during movement, for example, to improve the accuracy of the results of these operations.
For example, in the welding method provided by at least one embodiment of the present invention, the tab 10 is heated to 90-150 ℃, i.e., the tab 10 may be heated to other values in 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, or 90-150 ℃.
For example, in the welding method provided in at least one embodiment of the present invention, the tab 10 is unidirectionally heated by the heating mechanism 202, and the heating mechanism 202 is configured as at least one of, but not limited to, a magnetic induction heating device, a hot air heating device, a radiation heating device, an infrared heating device, a microwave heating device, and a hot oil heating device.
Referring to fig. 2 to 7, at least one embodiment of the present invention provides a welding apparatus for welding a tab 10, where the tab 10 includes a non-conductive layer 1012 and conductive layers 1011 covering two sides of the non-conductive layer 1012, and the welding apparatus includes an unreeling mechanism 201, a heating mechanism 202, a shaping mechanism 203, a foil placing mechanism 206, an ultrasonic welding mechanism 204, and a reeling mechanism 205.
The unreeling mechanism 201 is used for outputting the tab 10, and the tab 10 sequentially passes through the heating mechanism 202, the shaping mechanism 203, the foil placing mechanism 206, the ultrasonic welding mechanism 204 and the reeling mechanism 205. The heating mechanism 202 is used to heat the non-conductive layer 1012 to a softened state. The shaping mechanism 203 is used for bi-directionally extruding and shaping the tab 10 in the thickness direction, and extruding a part of the non-conductive layer 1012 in the tab 10 to reduce the thickness of the non-conductive layer 1012. The foil placement mechanism 206 is configured to place the foil 104 on the surface of the at least one conductive layer 1011. The ultrasonic welding mechanism 204 comprises a welding head, the welding head is provided with a welding mark 105, the welding mark 105 comprises a tooth region 1051 and a toothless region 1052, the tooth region 1051 is used for welding a conductive layer 1011 and a foil 104, the toothless region 1052 is used for accommodating and welding a non-conductive layer 1012 extruded in the welding process, and the distribution area of the toothless region 1052 is smaller than that of the tooth region 1051. The winding mechanism 205 is used for recycling the tab 10.
In the welding apparatus of the above embodiment, by reducing the thickness of the nonmetallic layer in the tab 10 by extrusion before ultrasonic welding, in this way, the extrusion amount of the nonmetallic layer in the welding process can be reduced, and thus, the horn welding 105 for ultrasonic welding can form the toothless area 1052 with smaller distribution area and the tooth area 1051 with larger distribution area, and further, the effective welding area of the foil 104 and the metallic layer can be enlarged, and the welding effect can be made more stable. Further, the area of the weld between metals is increased, thereby increasing the overcurrent capability of the product. Due to the advanced extrusion of the non-conductive layer 1012, the required weld head pressure during subsequent welding is reduced and, at the same time, the overall welding parameters are reduced, increasing the service life of the weld head. Further, since the welding area between the nonmetal and the metal is reduced and the welding area between the metal and the metal is increased, the power required for ultrasonic welding can be less adaptable.
In the embodiment of the present invention, the tooth-bonding regions 1051 are exposed on the surface of the toothless region 1052, and the toothless region 1052 is disposed between two adjacent tooth-bonding regions 1051, the non-conductive layer 1012 is extruded and then is accommodated in the toothless region 1052, and each protruding tooth-bonding region 1051 can be abutted against the conductive layer 1011 and the foil 104.
For example, the active material 102 is coated on the current collector 101 (i.e., tab 10), and rolled to form a web of tab 10.
For example, when the tab 10 is heated to a predetermined temperature, the non-conductive layer 1012 is softened, and can be pressed out from between the conductive layers 1011 on both sides. For example, the non-conductive layer 1012 is configured as plastic. For example, the predetermined temperature is configured as the melting point temperature of the plastic and the bottom temperature + -10deg.C.
For example, when the tab 10 is pressed in both directions in the thickness direction of the tab 10 after heating, the conductive layers 1011 on both sides are recessed toward the non-conductive layer 1012 to some extent, and then the non-conductive layer 1012 in the vicinity of the recess is pressed out of the tab 10. For example, when the non-conductive layer 1012 is cooled to return to a solid state, the tab 10 is pressed and shaped. It should be noted that, the non-conductive layer 1012 after extrusion molding still has a certain thickness, and the non-conductive layer 1012 can be extruded to the shallow welding beverage area after being melted in the subsequent ultrasonic welding process.
For example, the outer conductive layer 1011 places the foil 104 for use as, for example, a transfer sheet.
For example, in a soldering apparatus according to at least one embodiment of the present invention, each of the tooth regions 1051 in the solder mark 105 is arranged in a matrix. For example, the profile of each tooth region 1051 may also be configured as a rectangle. However, the present design is not limited thereto, and in other embodiments, each of the tooth regions 1051 may be provided in, for example, an oval shape or the like.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the welding apparatus further includes a detecting mechanism disposed downstream of the shaping mechanism 203 and upstream of the ultrasonic welding mechanism 204, the detecting mechanism is configured to detect the thickness of the non-conductive layer 1012 of the shaped tab 10, and if the thickness of the non-conductive layer 1012 is within a predetermined range, the tab 10 is recovered to the winding mechanism 205 after being welded; if the thickness of the non-conductive layer 1012 is outside the predetermined range, the tab 10 is marked and then directly recycled to the winding mechanism 205.
For example, a predetermined thickness value is set, the detection mechanism determines whether the tab 10 is recovered after ultrasonic welding or directly recovered after marking according to the comparison between the detection value and the predetermined thickness value, and for example, when the detection value is greater than the predetermined value, it is determined that the tab 10 corresponding to the detection value is not qualified in extrusion and shaping, and the tab 10 is directly recovered by the winding mechanism 205 after marking. For example, the predetermined thickness value is set according to the size of the conductive layer 1011, the size of the foil 104, and/or the size of the tooth bonding region 1051 and the tooth-free region 1052.
For example, in the welding apparatus according to at least one embodiment of the present invention, the tab 10 moves along a straight path and passes through the heating mechanism 202, the shaping mechanism 203, the foil placement mechanism 206, the detection mechanism and the ultrasonic welding mechanism 204. It will be appreciated that the tab 10 is configured to move continuously along a straight path, avoiding turning and tilting of the path during movement of the tab 10, which can facilitate heating, extrusion shaping, foil 104 placement, inspection, and ultrasonic welding of the tab 10 during movement, for example, to improve the accuracy of the results of these operations.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the unwinding mechanism 201 includes a coil unwinding roller, a coil unwinding driving roller and a coil tension adjusting device, the coil unwinding roller is adapted to wind the coil of the tab 10, the coil unwinding driving roller is used for driving the coil unwinding roller to rotate, the coil tension adjusting device is used for changing the moving path of the tab 10 and adjusting the tension of the tab 10, the coil tension adjusting device is configured to be at least two, a first one of the coil tension adjusting devices is arranged on the moving path of the tab 10 between the coil unwinding roller and the heating mechanism 202, a second one of the coil tension adjusting devices is arranged on the moving path of the tab 10 between the ultrasonic welding mechanism 204 and the winding mechanism 205, and the first one, the heating mechanism 202, the shaping mechanism 203, the foil placing mechanism 206, the ultrasonic welding mechanism 204 and the second one are arranged in sequence along the same straight line.
In this embodiment, the movement speed of the tab 10 can be controlled by adjusting the rotation speed of the coil unreeling driving roller, and moderate movement speed of the tab 10 can ensure orderly heating operation, extrusion shaping operation, foil 104 placement operation, detection operation and ultrasonic welding operation of the tab 10. Further, the coil unreeling driving roller can be adjusted to start and stop according to the detection result of the detection mechanism.
Further, the first and second ones of the web tension adjusting devices straighten the tab 10 in opposite lateral directions, enabling the tab 10 to pass along a straight path through the heating mechanism 202, the shaping mechanism 203, the foil placement mechanism 206, the detection mechanism, and the ultrasonic welding mechanism 204. Further, the coil tension adjusting device can maintain enough tension in the moving process of the tab 10, and can prevent loosening and shaking, and can facilitate the heating operation, the extrusion shaping operation, the foil 104 placing operation, the detection operation and the ultrasonic welding operation of the tab 10 in the moving process, for example, the accuracy of the results of the operations can be improved.
For example, in the welding apparatus provided by at least one embodiment of the present invention, the heating source of the heating mechanism 202 is configured as at least one of, but not limited to, a magnetic induction heating device, a hot air heating device, a radiant heating device, an infrared heating device, a microwave heating device, and a hot oil heating device.
For example, in the welding apparatus provided by at least one embodiment of the present invention, the tab 10 is heated to 90-150 ℃, i.e., the tab 10 may be heated to other values in 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, or 90-150 ℃.
For example, in a welding apparatus provided by at least one embodiment of the present invention, the setting mechanism 203 is located inside or outside the heating region of the heating mechanism 202. It will be appreciated that when the shaping mechanism 203 is located within the heating region of the heating mechanism 202, the heated non-conductive layer 1012 can be extruded and shaped by the shaping mechanism 203 in time. When the shaping mechanism 203 is located outside the heating area of the heating mechanism 202, the heated non-conductive layer 1012 can still maintain a softened state for a period of time after being far away from the heating area, and is extruded and shaped outside the heating area by the shaping mechanism 203, in which case, the solidification speed of the non-conductive layer 1012 is not greatly affected by the decrease of temperature.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the shaping mechanism 203 includes two pressing members for respectively performing two-way pressing shaping thereof in the thickness direction of the tab 10, wherein at least one of the pressing members is configured as a circular roller. The circular roller can maintain a continuous rotation state during the pressing process, so that a pressing operation with low resistance can be maintained for the tab 10 during the movement.
For example, in the welding apparatus provided in at least one embodiment of the present invention, the outer peripheral surface of the circular roller is provided with a pattern, or the outer peripheral surface of the circular roller is provided with a smooth surface. As can be appreciated, the provision of the circular roller outer circumferential surface as a smooth surface can reduce the resistance to movement of the tab 10.
For example, in the welding apparatus according to at least one embodiment of the present invention, the foil 104 is welded to the upper layer and/or the lower layer of the tab 10.
One comparative example of the welding method and the welding apparatus provided by the embodiment of the present invention is described below:
referring to fig. 8, a tab coil composed of a current collector and an active material is mounted on an ultrasonic welder through an unreeling mechanism; the tab and foil may form a solder 105 by a soldering mechanism. Since the comparative example was not subjected to the treatment in the embodiment of the present invention, the area of the tooth-bonding region 1051 in the solder mark 105 was small, and the area of the tooth-free region 1052 was large.
| Welding pressure (bar) | Welding amplitude (%) | Resistance (mΩ) | |
| Examples | 2.5 | 30 | 15 |
| Comparative example | 1.5 | 28 | 10 |
TABLE 1
Table 1 shows the welding data obtained in the examples of the present invention and comparative examples, respectively.
In the welding method and the welding device provided by the embodiment of the invention, the welding area of the corresponding conductive layer 1011 in the welding mark 105 is increased, so that the welding resistance can be reduced, the welding parameters used as a whole are also reduced, and the service life of the subsequent welding head can be prolonged
It should be noted that "and/or" in the whole text includes three schemes, taking "a and/or B" as an example, including a technical scheme, a technical scheme B, and a technical scheme that a and B meet simultaneously.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A welding method for welding a tab, the tab including a non-conductive layer and conductive layers coated on both sides of the non-conductive layer, the welding method comprising:
heating the tab to a predetermined temperature range to soften the non-conductive layer;
bi-directional extrusion molding is carried out on the heated tab in the thickness direction of the tab, and a part of the non-conductive layer in the tab is extruded to reduce the thickness of the non-conductive layer;
placing a foil on the surface of at least one conductive layer;
detecting the thickness of the non-conductive layer of the tab after extrusion shaping, performing ultrasonic welding if the thickness of the non-conductive layer is within a preset range, and directly recycling after marking if the thickness of the non-conductive layer is outside the preset range.
2. The welding method according to claim 1, wherein,
the moving path of the lug is regulated by a coiled material tension regulating device, so that the lugs are all positioned on the same straight line during heating, extrusion shaping, foil placement, detection and ultrasonic welding; and/or
The tension of the tab is regulated by a coiled material tension regulating device; and/or
The tab is heated to 90-150 ℃; and/or
The tab is unidirectionally heated by a heating mechanism configured as at least one of a magnetic induction heating device, a hot air heating device, a radiant heating device, an infrared heating device, a microwave heating device, and a hot oil heating device.
3. The welding equipment is characterized by being used for welding the tab, wherein the tab comprises a non-conductive layer and conductive layers which are arranged on two sides of the non-conductive layer in a covering mode, and the welding equipment comprises an unreeling mechanism, a heating mechanism, a shaping mechanism, a foil placing mechanism, an ultrasonic welding mechanism and a reeling mechanism;
the unreeling mechanism is used for outputting the tab, and the tab sequentially passes through the heating mechanism, the shaping mechanism, the foil placing mechanism, the ultrasonic welding mechanism and the reeling mechanism;
the heating mechanism is used for heating the non-conductive layer to a softened state;
the shaping mechanism is used for carrying out bidirectional extrusion shaping on the lug in the thickness direction of the lug, and extruding part of the non-conductive layer in the lug to reduce the thickness of the non-conductive layer;
the foil placing mechanism is used for placing foil on the surface of at least one conductive layer;
the ultrasonic welding mechanism comprises a welding head, wherein the welding head is provided with a welding mark, the welding mark comprises a tooth welding area and a tooth-free area, the tooth welding area is used for welding the conductive layer and the foil, the tooth-free area is used for accommodating and welding the non-conductive layer extruded in the welding process, and the area of the tooth-free area is smaller than that of the tooth welding area;
the winding mechanism is used for recycling the pole piece.
4. The welding apparatus of claim 3 wherein,
and each welding tooth area in the welding printing is distributed in a matrix.
5. The welding apparatus of claim 3 wherein,
the welding equipment further comprises a detection mechanism arranged at the downstream of the shaping mechanism and the upstream of the ultrasonic welding mechanism, wherein the detection mechanism is used for detecting the thickness of the non-conductive layer of the shaped tab, and if the thickness of the non-conductive layer is within a preset range, the tab is recovered to the winding mechanism after being welded; and if the thickness of the non-conductive layer is out of the preset range, marking the tab and directly recycling the tab to the winding mechanism.
6. The welding apparatus of claim 5 wherein,
the tab moves along a straight path and passes through the heating mechanism, the shaping mechanism, the foil placing mechanism, the detecting mechanism and the ultrasonic welding mechanism.
7. The welding apparatus of claim 6 wherein,
the coil unwinding mechanism comprises a coil unwinding roller, a coil unwinding driving roller and a coil tension adjusting device, wherein a coil of a lug is wound outside the coil unwinding roller, the coil unwinding driving roller is used for driving the coil unwinding roller to rotate, the coil tension adjusting device is used for changing the moving path of the lug and adjusting the tension of the lug, the coil tension adjusting device is configured to be at least two, a first one of the coil tension adjusting device is arranged on the moving path of the lug between the coil unwinding roller and the heating mechanism, a second one of the coil tension adjusting device is arranged on the moving path of the lug between the ultrasonic welding mechanism and the winding mechanism, and the first one of the coil tension adjusting device, the heating mechanism, the shaping mechanism, the foil placing mechanism and the second one of the coil tension adjusting device are sequentially arranged along the same straight line.
8. Welding apparatus according to any one of claims 3 to 7, characterized in that,
the heating source of the heating mechanism is configured as at least one of a magnetic induction heating device, a hot air heating device, a radiation heating device, an infrared heating device, a microwave heating device and a hot oil heating device; and/or
The tab is heated to 90-150 ℃; and/or
The shaping mechanism is positioned inside or outside the heating area of the heating mechanism.
9. Welding apparatus according to any one of claims 3 to 7, characterized in that,
the shaping mechanism comprises two extrusion parts for respectively performing bidirectional extrusion shaping on the tab in the thickness direction, wherein at least one extrusion part is configured as a circular roller; and/or
The outer circumferential surface of the round roller is provided with patterns, or the outer circumferential surface of the round roller is provided with a smooth surface.
10. Welding apparatus according to any one of claims 3 to 7, characterized in that,
the foil is welded on the upper layer and/or the lower layer of the tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931000.2A CN116727830A (en) | 2023-07-27 | 2023-07-27 | Welding method and welding apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931000.2A CN116727830A (en) | 2023-07-27 | 2023-07-27 | Welding method and welding apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116727830A true CN116727830A (en) | 2023-09-12 |
Family
ID=87913633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310931000.2A Pending CN116727830A (en) | 2023-07-27 | 2023-07-27 | Welding method and welding apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116727830A (en) |
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2023
- 2023-07-27 CN CN202310931000.2A patent/CN116727830A/en active Pending
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