CN114603282A - Welding device, adapter of cylindrical battery and shell welding method - Google Patents
Welding device, adapter of cylindrical battery and shell welding method Download PDFInfo
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- CN114603282A CN114603282A CN202210311842.3A CN202210311842A CN114603282A CN 114603282 A CN114603282 A CN 114603282A CN 202210311842 A CN202210311842 A CN 202210311842A CN 114603282 A CN114603282 A CN 114603282A
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- 238000003466 welding Methods 0.000 title claims abstract description 236
- 238000000034 method Methods 0.000 title claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005476 soldering Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 206010016766 flatulence Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a welding device, which is used for welding a switching piece of a cylindrical battery with a shell. The inflatable shaft is selectively rotatably connected to the bracket about its axis. A plurality of welding pins are connected to the expansion shaft at intervals in the circumferential direction and extend in the radial direction of the expansion shaft. The air expansion shaft can be used for welding the adapter sheet and the cylindrical side wall in the cylindrical battery, the current collecting disc is connected with the output electrode of the cylindrical battery core, the air expansion shaft is placed on the output electrode, the air expansion shaft is inflated to enable the air expansion shaft to expand, so that the plurality of welding pins push the connecting part of the adapter to abut against the cylindrical side wall, and then the plurality of welding pins are electrified in sequence, so that the plurality of welding pins heat the connecting part in sequence and are welded with the cylindrical side wall. The welding device can be used for welding the adapter of the cylindrical battery and the cylindrical side wall, can ensure that the adapter and the cylindrical side wall are uniformly welded, is simple to operate, and can reduce the manufacturing time of the cylindrical battery.
Description
Technical Field
The invention relates to the field of lithium battery manufacturing, in particular to a welding device and a method for welding an adapter and a shell of a cylindrical battery.
Background
As one of the most core components of new energy vehicles, lithium ions have advantages of high energy density, long cycle life, safety, environmental protection, and the like, so that lithium batteries are becoming the mainstream of the electric era.
Lithium ion batteries are morphologically divided into hard shell batteries, soft package batteries and cylindrical batteries, wherein the cylindrical batteries have the advantages of high volume energy density, simple structure, easy grouping, convenience for standardization and the like, and the large cylindrical batteries gradually become the mainstream direction of the market along with the development of the technology.
The cylindrical battery comprises a shell and a cylindrical battery core. The shell comprises a top cover, a bottom cover and a cylindrical side wall, the cylindrical battery cell is installed in the shell, two output poles are arranged at two ends of the cylindrical battery cell, one output pole is close to the top cover and outputs through the top cover, the other output pole is close to the bottom cover and outputs through a rivet of the bottom cover, and the rivet and the bottom cover are arranged in an insulating mode. In general, the negative electrode is output through the top cover, and the positive electrode is output through the rivet.
In the manufacturing process of the cylindrical battery, two output electrodes of the cylindrical battery core are welded to the adapter first and then output through the adapter. For the negative pole of the cylindrical battery core, the shell is made of metal, and the shell can conduct electricity on the whole, so that any position of the adapter connected with the shell of the cylindrical battery can be output through the top cover. In the prior art, the adapter plate is generally connected to the top cover or the cylindrical side wall of the shell in a resistance welding mode, but in order to ensure the overcurrent capacity of the adapter plate, a welding needle is generally required to be used for welding for many times, the operation is extremely inconvenient, and the working hours are very wasted.
Disclosure of Invention
The invention aims to provide a welding device and a welding method of an adapter and a shell of a cylindrical battery, which are used for solving the problems in the prior art.
In order to solve the above problems, according to an aspect of the present invention, there is provided a welding apparatus for welding an interposer and a case of a cylindrical battery, comprising:
a support;
an air expansion shaft; the inflatable shaft is connected to the bracket around the axis of the inflatable shaft in a selectable rotation mode; and
a plurality of welding pins connected to the inflator shaft at intervals in a circumferential direction and extending in a radial direction of the inflator shaft.
In one embodiment, the welding pin comprises a welding pin body and a welding pin head, the welding pin body is in a rod shape, one end of the welding pin body is connected with the air expansion shaft, the other end of the welding pin body is connected with the welding pin head, and the welding pin bodies are uniformly arranged at intervals along the circumferential direction of the air expansion shaft.
In one embodiment, the number of the welding pins is four, and the circumferential positions of the welding pin heads of the four welding pins relative to the air inflation shaft are different.
In one embodiment, the welding device further comprises a chassis, the chassis is connected with the bottom end of the air inflation shaft and is larger than the air inflation shaft in diameter, and a plurality of welding pins are arranged close to the bottom end of the air inflation shaft.
In one embodiment, the welding device further comprises a plurality of clamps, the plurality of clamps are respectively arranged on the radial outer sides of the plurality of welding pins and are spaced from the plurality of welding pins in the radial direction, and the plurality of clamps comprise cambered surfaces taking the axis of the air inflation shaft as the axis.
In one embodiment, the clip may be electrically conductive.
The invention also relates to a method for welding the adaptor and the shell of the cylindrical battery, wherein the cylindrical battery comprises a shell and a cylindrical battery cell, the shell comprises a cylindrical side wall, a bottom cover and a top cover, the bottom cover is connected to the bottom of the cylindrical side wall, the cylindrical battery cell is arranged in the shell, and the top end of the cylindrical battery cell is provided with an output electrode, and the method is characterized by comprising the following steps of:
s1, providing an adaptor, wherein the adaptor comprises a current collecting disc and a connecting part extending from the periphery of the current collecting disc to the top, and the current collecting disc is electrically connected to the output electrode of the cylindrical battery cell;
s2, placing the air inflation shaft and the plurality of welding pins in the cylindrical side wall and above the current collecting disc, centering the air inflation shaft and the cylindrical side wall, inflating the air inflation shaft and expanding the air inflation shaft so that the plurality of welding pins push the corresponding connecting parts to the cylindrical side wall;
s3, sequentially electrifying the welding pin heads for a period of time to enable the welding pin heads to respectively heat different positions of the cylindrical side wall; rotating the air inflation shaft, and enabling a plurality of welding needle heads to be far away from a previous welding position;
and S4, repeating the step S3 until the air inflation shaft rotates for one circle and the welding needle heads return to the original positions.
In one embodiment, a plurality of welding pins are uniformly arranged along the periphery of the air expansion shaft at intervals, each welding pin comprises a welding pin body and a welding pin head, each welding pin body is in a rod shape, one end of each welding pin body is connected with the air expansion shaft, and the circumferential positions of the welding pin heads relative to the air expansion shaft are different;
in step S3, the rotation angle of the air expanding shaft is equal to the angle between two adjacent welding pins.
In one embodiment, the number of the welding pins is four.
In one embodiment, the welding device further comprises a plurality of clamps, the number of clamps being equal to the number of welding pins;
in step S2, before inflating the inflatable shaft, the plurality of jigs are placed at positions close to the distal end of the outer peripheral surface of the cylindrical side wall so as to be evenly spaced apart from each other, and after inflating and expanding the inflatable shaft, the plurality of welding pins are pushed against the connecting portion so as to cause the connecting portion and the cylindrical side wall to abut against the plurality of jigs.
The welding device can be used for welding the adapter of the cylindrical battery and the cylindrical side wall, can ensure that the adapter and the cylindrical side wall are uniformly welded, is simple to operate, and can reduce the manufacturing time of the cylindrical battery.
Drawings
Fig. 1 is a schematic view of a welding apparatus and a cylindrical battery according to an embodiment of the present invention.
Fig. 2 is a top view of the welding apparatus and cylindrical battery in the embodiment of fig. 1.
FIG. 3 is a schematic illustration of the tip of the embodiment of FIG. 1 in different positions.
Fig. 4 is a schematic view of a welding apparatus and a cylindrical battery according to another embodiment of the present invention.
Reference numerals: 1. a welding device; 11. an inflatable shaft; 12. welding pins; 121. a welding pin body; 122. welding a needle head; 13. a chassis; 14. a clamp; 15. a conductive member; 2. a cylindrical battery; 21. a housing; 211. a cylindrical sidewall; 212. a bottom cover; 22. a cylindrical cell; 23. an adapter; 231. a current collecting plate; 232. a connecting portion.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.
Name interpretation:
cylindrical battery 2: the battery comprises a shell 21 and a cylindrical battery cell 22, wherein the shell 21 comprises a top cover, a bottom cover 212 and a cylindrical side wall 211, the top cover and the bottom cover 212 are respectively connected to the top and the bottom of the cylindrical side wall 211, and the cylindrical battery cell 22 is positioned in the shell 21.
Cylindrical battery cell 22: the diaphragm is positioned between the two pole pieces, two ends of the two pole pieces respectively extend out of two ends of the diaphragm and form two output poles of the cylindrical battery core 22, wherein one output pole is positioned close to the top end of the cylindrical side wall 211, the other output pole is close to the bottom end of the cylindrical side wall 211 and is connected with a rivet on the bottom cover 212, and current is output through the rivet.
The adaptor 23: the adaptor 23 may be electrically conductive, the adaptor 23 includes a current collecting disc 231 and a connecting portion 232, the connecting portion 232 extends from the periphery of the current collecting disc 231 toward the top, and the current collecting disc 231 is connected to the output electrode of the cylindrical battery cell 22 by welding.
Riveting: and the rivet is arranged on the bottom cover 212 and is insulated from the bottom cover 212, and the rivet is connected with the cylindrical battery core 22 and is close to the output pole on the bottom cover 212.
The inflatable shaft 11: a shaft that expands radially after high pressure inflation and retracts rapidly after deflation.
Resistance welding: the method of welding by locally heating a workpiece by using resistance heat generated when an electric current is passed through the welding pin 12 and a contact portion as a heat source and applying pressure is a welding method of welding by melting a contact surface between two workpieces by using resistance heat generated when an electric current is passed through the workpieces.
The invention relates to a welding device 1, wherein the welding device 1 is used for welding an adapter plate of a cylindrical battery 2 with a shell 21, and the welding device 1 comprises a bracket, an air expansion shaft 11 and a plurality of welding pins 12. The inflator shaft 11 is rotatably connected about its axis to the bracket. A plurality of welding pins 12 are connected to the inflator shaft 11 at intervals from each other in the circumferential direction and extend in the radial direction of the inflator shaft 11.
The air shaft 11 of the present invention can be used for welding between the adaptor sheet and the cylindrical side wall 211 in the cylindrical battery 2, and after the cylindrical battery core 22 is placed in the housing 21, the current collecting disc 231 of the adapter sheet is connected to the output pole of the cylindrical electric core 22, the air inflation shaft 11 and the plurality of welding pins 12 are placed on the output pole, inflation of the inflator shaft 11 causes radial expansion of the inflator shaft 11, thereby causing the plurality of welding pins 12 to push the connecting portion 232 of the adaptor 23 against the cylindrical sidewall 211, and in turn energizing the plurality of welding pins 12, so that the plurality of welding pins 12 sequentially heat the connecting portion 232 and weld it to the cylindrical side wall 211, after which the inflator shaft 11 can be rotated, so that the plurality of welding pins 12 deviate from the previous welding position, and then the plurality of welding pins 12 are electrified in turn, so that the plurality of welding pins 12 weld different positions of the connecting part 232 again, and the process is circulated in turn until the connecting part 232 is fully welded to the cylindrical side wall 211. The rotation of the air expansion shaft 11 can drive the plurality of welding pins 12 to weld different positions of the connecting part 232 with the cylindrical side wall 211, so that the overflowing capacity between the connecting part 232 and the cylindrical side wall 211 is increased.
Optionally, the welding pin 12 includes a welding pin body 121 and a welding pin head 122, the welding pin body 121 is rod-shaped, one end of the welding pin body is connected to the physiosis shaft 11, the other end of the welding pin body is connected to the welding pin head 122, and the plurality of welding pin cups 121 are arranged at even intervals along the circumference of the physiosis shaft 11. In the embodiment of fig. 1 and 2, the number of the welding pins 12 is four, and the four welding pins 12 are uniformly spaced. Four welding pins 12 interval 90 distribute in 11 peripheries of physiosis, in proper order to four welding pins 12 circular telegrams back, can make four welding pins 12 weld four positions of connecting portion 232 in turn, and four positions along circumference evenly distributed in connecting portion 232. Further, the four welding pins 12 may be welded to the connecting portion 232 and the cylindrical sidewall 211 uniformly in the circumferential direction after rotating for a plurality of times by controlling the angle of each rotation of the inflator shaft 11, for example, the angles of the rotation of the inflator shaft 11 may be 5 °, 10 °, 15 °, 20 °, 30 °, 45 °, 60 °, and the like. Optionally, the flatulence shaft 11 can also be controlled to rotate by a small angle, such as 1 °, 2 °, 3 °, or other small angles, each time, so that the four welding pins 12 rotate in four welding areas spaced by 90 °, and by rotating the welding pins 12, the plurality of welding pins 12 can be simultaneously deviated from the previous welding position, and then sequentially electrifying the plurality of welding pins 12, so that the welding points between the connection portion 232 and the cylindrical sidewall 211 can be increased, and the overcurrent capacity of the connection portion 232 can be increased.
Alternatively, the four welding tip heads 122 differ in circumferential position relative to the inflator shaft 11. As shown in fig. 3a, 3b, 3c and 3d, four welding tip heads 122 are respectively located at different positions of the welding tip body 121, in fig. 3a, the soldering tip 122 is located at the left side of the axial center of the soldering tip body 121, in fig. 3b, the soldering tip 122 is located at the lower side of the axial center of the soldering tip body 121, in fig. 3c, the welding tip 122 is located at the right side of the axial center of the welding tip body 121, in fig. 3d, the welding tip 122 is located at the upper side of the axial center of the welding tip body 121, the four welding tip 122 are respectively located at different positions deviating from the axial center of the welding tip body 121, after the physiosis shaft 11 is rotated by 90 degrees, the welding tip 122 of the four welding tips 12 will not be welded in an overlapping manner, the rotation of the air expansion shaft 11 can be controlled to be three times, the four welding needle heads 122 rotate for 90 degrees three times, so that the connection portion 232 is formed with four welding areas, and the four welding pins 12 are welded to the four welding areas of the connection portion 232 in turn, and each welding area has four different welding points. It should be understood that the rotation of the inflator shaft 11 by a small angle, such as 30 ° or 60 ° each time, may be controlled, without limiting the rotation angle of the inflator shaft 11 each time. For example, when the rotation is 30 °, the inflator shaft 11 can be rotated 11 times, 12 welding areas with uniform intervals are formed on the connecting portion 232, and each welding area can be welded with a plurality of welding points, the rotation angle of the inflator shaft 11 can be set according to needs, and the number of welding points of each welding area can also be set according to needs. It should be understood that, when the welding device 1 of the present invention is used, a person skilled in the art can control the rotation angle of the inflator shaft 11 to be different every time, without limiting the rotation angle of the inflator shaft 11, and can ensure sufficient welding fastness between the connecting portion 232 and the cylindrical side wall 211, and can ensure the flow capacity of the connecting portion 232.
Optionally, the welding pin bodies 121 may be disposed at uneven intervals, and the angle of each rotation of the physiosis shaft 11 may be controlled, so that the welding pin bodies 121 are welded between two adjacent welding pin bodies 121, and the two welding pins 12 are prevented from being welded repeatedly at the same position. At this time, the welding pin head 122 may be at the same circumferential position of the ballooning shaft with respect to the welding pin body 121. Optionally, the bottom end of the air inflation shaft 11 is further provided with a chassis 13, the diameter of the air inflation shaft 11 is smaller than that of the chassis 13, and the plurality of welding pins 12 are arranged near the bottom end of the air inflation shaft 11. As shown in fig. 1, when the welding apparatus 1 is used, the base plate 13 is inflated to the center position of the counter flow plate 231 and the inflator shaft 11 is inflated. The center of the cylindrical cell 22 generally has an axial channel running through both ends, and the centers of some of the current collecting discs 231 are also provided with through holes corresponding to the channels, while the inflator 11 of the present invention can be positioned and installed at the centers of the current collecting discs 231 and the cylindrical cell 22, i.e. aligned with the axis of the cylindrical sidewall 211, on the other hand, the diameter of the bottom disc 13 is larger, and can also prevent the inflator 11 from being sunk into the axial channel of the cylindrical cell 22 during the rotation process, which in turn causes damage to the cylindrical cell 22.
Optionally, the welding device 1 further includes a plurality of clamps 14, the plurality of clamps 14 are respectively disposed radially outside the plurality of welding pins 12 and radially spaced apart from the plurality of welding pins 12, and the plurality of clamps 14 include an arc surface having an axis of the inflator 11 as an axis. The plurality of jigs 14 may be installed outside the cylindrical sidewall 211 of the cylindrical battery 2 to hold the cylindrical sidewall 211 and prevent the cylindrical sidewall 211 from being pushed by the welding pins 12 and the connection portions 232 and then expanded to the outside, thereby causing poor contact between the cylindrical sidewall 211 and the connection portions 232 and causing insufficient cold solder, void, poor welding, or the like. In the embodiment of fig. 1 and 2, four clamps 14 are disposed at 90 ° intervals outside the cylindrical sidewall 211, respectively, it being understood that more or fewer clamps 14 may be disposed, or a cylindrical clamp 14 may be disposed to cover the cylindrical sidewall 211, thereby preventing the cylindrical sidewall 211 from expanding during the welding process.
Alternatively, the clamp 14 may be electrically conductive. The welding device 1 of the present invention is resistance welding, and according to the principle of resistance welding, the current is required to pass through the welding needle 12 and the resistance heat at the connecting portion 232 as a heat source to locally heat the connecting portion 232, so that the contact surface between the connecting portion 232 and the cylindrical side wall 211 is melted to realize the connection welding method, and the current is required to form a closed loop after flowing through the cylindrical side wall 211, so as to ensure the generation of the resistance heat. The clamp 14 is located outside the cylindrical sidewall 211 and may act as a conductive member allowing current to flow from the clamp 14. Alternatively, the clamp 14 may be provided as an insulator, and the other conductive members 15 may form a closed loop circuit after passing a current through the cylindrical side wall 211. As shown in fig. 4, the conductive member 15 may be disposed at the bottom of the cylindrical sidewall 211, and the current may flow into the conductive member 15 through the cylindrical sidewall 211 and the bottom cover 212 to form a loop, where the position and installation manner of the conductive member 15 are not limited.
The invention also relates to a welding method of the adaptor 23 and the shell 21 of the cylindrical battery 2, the cylindrical battery 2 comprises the shell 21 and the cylindrical battery core 22, the shell 21 comprises a cylindrical side wall 211, a bottom cover 212 and a top cover, and the bottom cover 212 is connected to the bottom of the cylindrical side wall 211. The cylindrical battery cell 22 is installed in the casing 21, and the top end of the cylindrical battery cell 22 has an output pole. Specifically, the method for welding the adaptor 23 and the housing 21 of the cylindrical battery 2 includes the steps of:
s1, providing an adaptor 23, where the adaptor 23 includes a current collecting plate 231 and a connecting portion 232 extending from the outer periphery of the current collecting plate 231 to the top, and the current collecting plate 231 is electrically connected to the output pole of the cylindrical battery core 22.
S2, the above-mentioned expansion shaft 11 and the plurality of welding pins 12 are placed in the cylindrical side wall 211 above the current collecting plate 231, the centers of the expansion shaft 11 and the cylindrical side wall 211 are aligned, and the expansion shaft 11 is inflated and radially expanded so that the plurality of welding pins 12 push the corresponding connecting portions 232 against the cylindrical side wall 211.
S3, sequentially electrifying the welding needle heads 122 for a period of time to enable the welding needle heads 122 to heat different positions of the cylindrical side wall 211 respectively; the inflator shaft 11 is rotated and the plurality of welding tips 122 are moved away from the previous welding position.
S4, the inflator shaft 11 is inflated again, and then the step S3 is repeated until the inflator shaft 11 rotates one circle and the plurality of welding tips 122 return to the original position.
Optionally, a plurality of welding pins 12 are evenly spaced along the circumference of the physiosis axle 11, and the welding pin 12 includes a welding pin body 121 and a welding pin head 122, and the welding pin body 121 is for shaft-like and one end connection physiosis axle 11, and is a plurality of the welding pin head 122 is relative the circumference position of physiosis axle 11 is different. In step S3, the inflator shaft 11 is rotated by an angle equal to an angle between two adjacent welding pins 12. In the embodiment of fig. 1 and 2, four welding pins 12 are uniformly distributed on the periphery of the physiosis shaft 11, an included angle between two adjacent welding pins 12 is 90 °, the positions of four welding pin heads 122 are as described above, the physiosis shaft 11 rotates 90 ° every time, after rotating three times, four welding areas can appear on each connecting part 232, and the four welding areas are uniformly distributed, the number of welding points of each welding area is four, and the welding firmness around the connecting part 232 is consistent. In another embodiment, the number of the welding pins 12 is 6, the 6 welding pin heads 122 are distributed at different positions, so that the inflator shaft 11 rotates 60 ° each time, after 5 times of rotation, 6 welding areas are formed on the connecting portion 232, each welding area has 6 welding points, and the connecting portion 232 is uniformly welded on the cylindrical side wall 211 along the circumferential direction.
It should be noted that, before rotating the inflator shaft 11, it is necessary to deflate the inflator shaft 11 to shrink the inflator shaft 11, rotate the inflator shaft 11 to a predetermined position, and inflate the inflator shaft 11 again, so that the plurality of welding pins 12 push the corresponding connecting portions 232 against the cylindrical side wall 211.
Optionally, the welding device 1 further comprises a plurality of clamps 14, the number of clamps 14 being equal to the number of welding pins 12. In the embodiment shown in fig. 1 and 2, four clamps 14 are respectively arranged at intervals outside the cylindrical side wall 211, and the inflator 11 rotates 90 ° each time, and after each rotation, four welding pins 12 correspond to the four clamps 14 respectively, and the clamps 14 can also be conductive, and after the welding pins 12 are powered, the clamps 14 transmit current and form a loop.
In step S2, before inflating the inflator shaft 11, the plurality of jigs 14 are abutted against the outer peripheral surface of the cylindrical side wall 211 at positions close to the top ends thereof, the plurality of jigs 14 are arranged at regular intervals, and after inflating and expanding the inflator shaft 11, the plurality of bonding pins 12 are pushed against the connecting portion 232 and the cylindrical side wall 211 are abutted against the plurality of jigs 14, and the plurality of jigs 14 can bring the cylindrical side wall 211 into sufficient contact with the connecting portion 232, thereby preventing the occurrence of cold joint after the cylindrical side wall 211 is expanded.
The welding device 1 can be used for welding the adaptor 23 of the cylindrical battery 2 and the cylindrical side wall 211, can ensure that the adaptor and the cylindrical side wall 211 are uniformly welded, is simple to operate, and can reduce the manufacturing time of the cylindrical battery 2.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. The utility model provides a welding set, welding set is used for the adaptor piece and the casing welding of cylinder battery, its characterized in that includes:
a support;
an inflatable shaft; the inflatable shaft is connected to the bracket around the axis of the inflatable shaft in a selectable rotation mode; and
a plurality of welding pins connected to the expansion shaft at intervals from each other in a circumferential direction and extending in a radial direction of the expansion shaft.
2. The welding device according to claim 1, wherein the welding pin comprises a welding pin body and a welding pin head, the welding pin body is rod-shaped, one end of the welding pin body is connected with the air expansion shaft, the other end of the welding pin body is connected with the welding pin head, and the welding pin bodies are uniformly arranged at intervals along the circumferential direction of the air expansion shaft.
3. The welding device according to claim 2, wherein the number of the welding pins is four, and the circumferential positions of the welding pin heads of the four welding pins with respect to the balloon shaft are different.
4. The welding device of claim 1, further comprising a base plate coupled to a bottom end of the inflator shaft and having a diameter greater than a diameter of the inflator shaft, a plurality of welding pins disposed proximate the bottom end of the inflator shaft.
5. The welding device according to claim 1, further comprising a plurality of jigs respectively disposed radially outside and spaced apart from the plurality of welding pins, and the plurality of jigs include an arc surface having an axis of the inflator shaft as an axis.
6. The welding device of claim 5, wherein the clamp is electrically conductive.
7. A cylindrical battery and a shell welding method, wherein the cylindrical battery comprises a shell and a cylindrical battery core, the shell comprises a cylindrical side wall, a bottom cover and a top cover, the bottom cover is connected to the bottom of the cylindrical side wall, the cylindrical battery core is installed in the shell, and the top end of the cylindrical battery core is provided with an output electrode, and the cylindrical battery welding method is characterized by comprising the following steps of:
s1, providing an adaptor, wherein the adaptor comprises a current collecting disc and a connecting part extending from the periphery of the current collecting disc to the top, and the current collecting disc is electrically connected to the output electrode of the cylindrical battery cell;
s2, placing the flatiron and the plurality of welding pins of claim 1 in the cylindrical side wall and above the current collecting plate, aligning the flatiron and the cylindrical side wall, inflating the flatiron and expanding the flatiron so that the plurality of welding pins push the corresponding connecting portions against the cylindrical side wall;
s3, sequentially electrifying the welding pin heads for a period of time to enable the welding pin heads to respectively heat different positions of the cylindrical side wall; rotating the air inflation shaft, and enabling a plurality of welding needle heads to be far away from a previous welding position;
and S4, repeating the step S3 until the air inflation shaft rotates for one circle and the welding needle heads return to the original positions.
8. The cylindrical battery adaptor and shell welding method according to claim 7, wherein a plurality of welding pins are uniformly spaced along the circumference of the physiosis shaft, each welding pin comprises a welding pin body and a welding pin head, each welding pin body is rod-shaped, one end of each welding pin body is connected with the physiosis shaft, and the circumferential positions of the welding pin heads relative to the physiosis shaft are different;
in step S3, the rotation angle of the air expanding shaft is equal to the angle between two adjacent welding pins.
9. The cylindrical battery adaptor and case welding method of claim 8, wherein the number of said welding pins is four.
10. The cylindrical battery adaptor and case welding method of claim 7, wherein said welding apparatus further comprises a plurality of jigs, the number of said jigs being equal to the number of said welding pins;
in step S2, before inflating the inflatable shaft, the plurality of jigs are placed at positions close to the distal end of the outer peripheral surface of the cylindrical side wall so as to be evenly spaced apart from each other, and after inflating and expanding the inflatable shaft, the plurality of welding pins are pushed against the connecting portion so as to cause the connecting portion and the cylindrical side wall to abut against the plurality of jigs.
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