CN217913360U - Intermittent multi-welding-point welding equipment for bottom welding - Google Patents

Abstract

The application provides an intermittent type formula multiple spot welding equipment for foot welding. The intermittent multi-welding-point welding equipment for bottom welding comprises a transmission line and an intermittent multi-welding-point welding device. The resistance welding seats of the at least two spot welding mechanisms are sequentially arranged along the conveying direction of the hard shell column type batteries on the transmission line, the eccentric welding pins of the at least two spot welding mechanisms are used for being in one-to-one correspondence with the arrangement of the at least two spot welding stations, the eccentric welding pin of each spot welding mechanism moves away from the spot welding station close to the corresponding spot welding station through the displacement assembly, the free end of the eccentric welding pin of each spot welding mechanism is used for bottom welding the hard shell column type batteries placed on the corresponding spot welding stations and forming resistance welding spots, and the resistance welding spots are arranged at intervals. The intermittent multi-welding-point welding equipment for the bottom welding can improve the connection firmness of each resistance welding point and the forming stability of each resistance welding point in the multi-point spot welding of the battery core, and further can better ensure the quality of the battery.

Description

Intermittent multi-welding-point welding equipment for bottom welding

Technical Field

The utility model relates to a battery spot welding technical field especially relates to an end welding is with many solder joints welding equipment of intermittent type formula.

Background

Along with the rapid development of new energy, the popularization range of batteries is wider and wider, especially for the popularization and use of new energy automobiles, the requirements on the energy density and the safety of the batteries are higher and higher, and then the steel shell batteries are rapidly developed, the steel shell batteries comprise a plurality of procedures in the processing and production process, wherein the procedures comprise the steps of installing a bottom gasket and a battery core into a steel shell, and carrying out spot welding on the bottom of the battery core and the gasket, the spot welding effect of the bottom of the battery core is directly related to the quality of the batteries, in particular to the steps of inserting a welding pin into a central hole formed in the middle of the battery core, then carrying out spot welding when the welding pin is pressed under the battery core and the gasket, then pulling the pin out, the spot welding of electric core has been accomplished promptly, however the relatively poor problem of single spot welding steadiness often can appear when spot welding is carried out to electric core and gasket to the welding needle, consequently, now more make outstanding a plurality of welding points on the welding needle and electric core contact and once only forming a plurality of solder joints at electric core, nevertheless because the actual a plurality of bumps that form on the welding point on the welding needle, a plurality of bumps receive wearing and tearing of different degrees easily in the spot welding in-process, and the welding needle has dimensional error owing to processing, and then make the welding needle that contains a plurality of solder joints actually make electric core and gasket form multiple spot welding steadily, and then still difficult welding effect of guaranteeing electric core and gasket.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, provide one kind and can improve the firm in connection nature of each resistance solder joint and the stability in formation of each resistance solder joint among the electric core multiple spot welding, and then can ensure the end of the quality of battery better and weld with many solder joints welding equipment of intermittent type formula.

The purpose of the utility model is realized through the following technical scheme:

an intermittent multi-spot welding apparatus for bottom welding, comprising:

the transmission line is used for sequentially transmitting the hard shell column type batteries, and at least two spot welding stations are arranged on the transmission line;

the intermittent multi-welding-point welding device comprises at least two spot welding mechanisms, each spot welding mechanism comprises a resistance welding seat, a displacement assembly and an eccentric welding needle, the resistance welding seats are connected with the displacement assemblies in a sliding mode, and the eccentric welding needles are connected with the displacement assemblies; and

the resistance welding seats of the at least two spot welding mechanisms are sequentially arranged along the conveying direction of the hard shell column type batteries on the transmission line, the eccentric welding pins of the at least two spot welding mechanisms are used for being in one-to-one correspondence with the at least two spot welding stations, the eccentric welding pins of each spot welding mechanism move towards the spot welding stations far away from and close to the spot welding stations corresponding to the eccentric welding pins through the displacement assembly, the free ends of the eccentric welding pins of each spot welding mechanism are used for performing bottom welding on the hard shell column type batteries placed on the corresponding spot welding stations and forming resistance welding spots, and the resistance welding spots are arranged at intervals.

In one embodiment, each spot welding mechanism's displacement subassembly includes driving piece, regulating part and connect in the retaining member of regulating part, each spot welding mechanism's the driving piece of displacement subassembly with correspond resistance weld holder is connected, and each spot welding mechanism's the power take off end of the driving piece of displacement subassembly with correspond the regulating part is connected, each spot welding mechanism's the retaining member of displacement subassembly with correspond resistance weld holder sliding connection, each spot welding mechanism's eccentric welding needle with correspond the regulating part is connected, and each spot welding mechanism's eccentric welding needle slides through corresponding respectively the regulating part with the retaining member is towards being close to or keeping away from the correspondence the direction of spot welding station.

In one embodiment, the adjusting member of the displacement assembly of each spot welding mechanism includes a first adjusting portion and a second adjusting portion, the first adjusting portion and the second adjusting portion of the adjusting member of the displacement assembly of each spot welding mechanism are connected to the corresponding locking member, the first adjusting portion and the second adjusting portion of the adjusting member of the displacement assembly of each spot welding mechanism are connected to a power output end of the corresponding driving member, one end of the eccentric welding pin of each spot welding mechanism is connected to the corresponding first adjusting portion, the other end of the eccentric welding pin of each spot welding mechanism penetrates through the second adjusting portion, and the eccentric welding pin of each spot welding mechanism slides in a direction close to or away from the corresponding spot welding station through the corresponding first adjusting portion and the locking member.

In one embodiment, the locking member of the displacement assembly of each spot welding mechanism includes a first locking portion and a second locking portion, the first locking portion and the second locking portion of the locking member of the displacement assembly of each spot welding mechanism are slidably connected to the corresponding resistance welding seat, the first locking portion of the locking member of the displacement assembly of each spot welding mechanism is connected to the corresponding first adjusting portion, the second locking portion of the locking member of the displacement assembly of each spot welding mechanism is connected to the corresponding second adjusting portion, and the eccentric welding pin of each spot welding mechanism slides in a direction close to or away from the corresponding spot welding station through the corresponding first adjusting portion and the corresponding first locking member.

In one embodiment, each of the spot welding mechanisms further includes a welding pin protection shell, the second adjusting portion of the adjusting member of the displacement assembly of each of the spot welding mechanisms is connected with the corresponding welding pin protection shell, and the eccentric welding pin of each of the spot welding mechanisms is embedded in the corresponding welding pin protection shell when the eccentric welding pin is arranged away from the corresponding spot welding station.

In one embodiment, the welding pin protection shell of each spot welding mechanism includes a top shell member, a bottom shell member and a side shell member, the side shell member of the welding pin protection shell of each spot welding mechanism is connected to the corresponding second adjusting portion, the top shell member and the corresponding bottom shell member of the welding pin protection shell of each spot welding mechanism are respectively disposed at two ends of the corresponding side shell member, the side shell member of the welding pin protection shell of each spot welding mechanism is disposed around a free end of the corresponding eccentric welding pin when the corresponding eccentric welding pin is disposed away from the corresponding spot welding station, and the free end of the eccentric welding pin of each spot welding mechanism penetrates through the corresponding top shell member and is located between the corresponding top shell member and the corresponding bottom shell member when the corresponding eccentric welding pin is disposed away from the corresponding spot welding station.

In one embodiment, the top casing member of the needle protection casing of each of the spot welding mechanisms is provided with a first needle outlet, the bottom casing member of the needle protection casing of each of the spot welding mechanisms is provided with a second needle outlet, a free end of the eccentric needle of each of the spot welding mechanisms is inserted into the corresponding first needle outlet when the corresponding eccentric needle is disposed away from the corresponding spot welding station, and a free end of the eccentric needle of each of the spot welding mechanisms is inserted into the second needle outlet when the corresponding eccentric needle is disposed adjacent to the corresponding spot welding station.

In one embodiment, a calibration piece is disposed on a side, away from the corresponding side casing member, of the top casing member of the welding pin protection casing of each spot welding mechanism, the calibration piece of each spot welding mechanism is connected to the corresponding top casing member, the calibration piece of each spot welding mechanism is disposed adjacent to or spaced apart from the corresponding eccentric welding pin, and a plane on which the calibration piece of each spot welding mechanism is disposed is parallel to a central axis of the corresponding eccentric welding pin.

In one embodiment, the top housing member, the side housing member, the bottom housing member and the alignment tab of the needle protection housing of each of the spot welding mechanisms are a unitary structure.

In one embodiment, each spot welding mechanism further comprises a loading station, a central hole detection station, a welding detection station and a blanking station, wherein the loading station, the central hole detection station, the resistance welding seats of at least two spot welding mechanisms, the welding detection station and the blanking station are sequentially arranged along the transmission line.

Compared with the prior art, the utility model discloses at least, following advantage has:

the utility model discloses an end welding is with intermittent type formula multiple spot welding equipment, make the resistance weld seat of two at least spot welding mechanisms set up along the direction of transportation of crust column type battery on the transmission line in proper order, and each spot welding mechanism's eccentric welding needle moves towards keeping away from near the spot welding station that corresponds through the displacement subassembly, and the free end of each spot welding mechanism's eccentric welding needle is used for carrying out end welding and forming resistance solder joint to the crust column type battery of placing on the spot welding station that corresponds, each resistance solder joint is the interval setting each other, make electric core convey to two at least spot welding mechanism departments on the transmission line in proper order, and carried out two at least spot welding and make the resistance solder joint that forms two at least mutual intervals set up on the electric core by two at least eccentric welding needle cooperation displacement subassemblies of spot welding mechanism, the formation of a plurality of solder joints on the electric core has been realized promptly, and a plurality of solder joints on the electric core are independent formation in proper order, there is dimensional error because of processing has alleviateed the welding needle, and then make the problem that electric core and gasket form the multiple spot welding with the relatively difficult stability of stable formation of resistance spot welding in the welding needle that contains a plurality of solder joints, better ground, and each electric core resistance spot welding stability of spot welding has been improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of an intermittent multi-spot welding device for bottom welding according to an embodiment of the present invention;

FIG. 2 is another schematic structural view of the intermittent multi-spot welding device for bottom welding shown in FIG. 1;

FIG. 3 is another schematic structural view of the intermittent multi-spot welding device for bottom welding shown in FIG. 1;

FIG. 4 is a partial view of the intermittent multi-spot welding apparatus for foot welding shown in FIG. 1;

FIG. 5 is a partial view of the intermittent multi-spot welding apparatus for foot welding shown in FIG. 1;

FIG. 6 is a schematic diagram of an embodiment of an eccentric welding pin;

FIG. 7 is a partial view of the eccentric welding pin for bottom welding shown in FIG. 6;

fig. 8 is another partial view of the eccentric welding pin for bottom welding shown in fig. 6.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The application provides an intermittent type formula multiple spot welding equipment for end welding. The intermittent multi-welding-point welding equipment for bottom welding comprises a transmission line and an intermittent multi-welding-point welding device. The transmission line is used for conveying the hard shell column type battery in sequence, and at least two spot welding stations are arranged on the transmission line. The intermittent multi-welding-point welding device comprises at least two spot welding mechanisms, each spot welding mechanism comprises a resistance welding seat, a displacement assembly and an eccentric welding needle, the resistance welding seats are connected with the displacement assemblies in a sliding mode, and the eccentric welding needles are connected with the displacement assemblies. The resistance welding seats of the at least two spot welding mechanisms are sequentially arranged along the conveying direction of the hard shell column type batteries on the transmission line, the eccentric welding pins of the at least two spot welding mechanisms are used for being in one-to-one correspondence with the arrangement of the at least two spot welding stations, the eccentric welding pin of each spot welding mechanism moves away from the spot welding station close to the corresponding spot welding station through the displacement assembly, the free end of the eccentric welding pin of each spot welding mechanism is used for bottom welding the hard shell column type batteries placed on the corresponding spot welding stations and forming resistance welding spots, and the resistance welding spots are arranged at intervals.

The intermittent multi-spot welding equipment for bottom welding enables resistance welding seats of at least two spot welding mechanisms to be sequentially arranged along the conveying direction of a hard shell column type battery on a transmission line, an eccentric welding needle of each spot welding mechanism moves towards a position far away from and close to a corresponding spot welding station through a displacement assembly, the free end of the eccentric welding needle of each spot welding mechanism is used for bottom welding the hard shell column type battery placed on the corresponding spot welding station and forming resistance welding spots, the resistance welding spots are arranged at intervals, namely, a battery core is sequentially conveyed to the positions of the at least two spot welding mechanisms on the transmission line, at least two times of spot welding are carried out by matching the eccentric welding needles of the at least two spot welding mechanisms with the displacement assembly, so that the problem that the battery core and a gasket form multi-spot welding spots due to the fact that the at least two resistance welding spots are arranged at intervals is formed on the battery core is solved, the formation of the multiple welding spots on the battery core is realized, the multiple welding spots on the battery core are sequentially and independently formed, the size error of the welding needles due to the processing, and further the problem that the connection stability of the resistance spot welding spots and the resistance spot welding in each battery core are formed more stably is solved.

For better understanding of the intermittent multi-spot welding apparatus for bottom welding of the present application, the intermittent multi-spot welding apparatus for bottom welding of the present application is further explained as follows:

referring to fig. 1, 2 and 3, an intermittent multi-pad bonding apparatus 10A for bottom bonding according to an embodiment includes a transmission line 100A and an intermittent multi-pad bonding device 200A. The transfer line 100A is used to sequentially transfer hard shell column batteries, and at least two spot welding stations 101A are provided on the transfer line 100A. The intermittent multi-spot welding device 200A includes at least two spot welding mechanisms 210A, each spot welding mechanism 210A includes a resistance welding seat 212A, a displacement assembly 211A, and an eccentric welding pin 10, the resistance welding seat 212A is slidably connected to the displacement assembly 211A, and the eccentric welding pin 10 is connected to the displacement assembly 211A. The resistance welding seats 212A of the at least two spot welding mechanisms 210A are sequentially arranged along the conveying direction of the hard shell column type battery on the conveying line 100A, the eccentric welding pins 10 of the at least two spot welding mechanisms 210A are arranged in a one-to-one correspondence with the at least two spot welding stations 101A, the eccentric welding pin 10 of each spot welding mechanism 210A moves away from and close to the corresponding spot welding station 101A through the displacement assembly 211A, the free end of the eccentric welding pin 10 of each spot welding mechanism 210A is used for performing bottom welding on the hard shell column type battery placed on the corresponding spot welding station 101A and forming resistance welding points, and the resistance welding points are arranged at intervals.

In the intermittent multi-spot welding device 10A for bottom welding, the resistance welding seats 212A of the at least two spot welding mechanisms 210A are sequentially arranged along the transportation direction of the hard-shell column type battery on the transmission line 100A, the eccentric welding pin 10 of each spot welding mechanism 210A moves away from and close to the corresponding spot welding station 101A through the displacement assembly 211A, and the free end of the eccentric welding pin 10 of each spot welding mechanism 210A is used for bottom welding the hard-shell column type battery placed on the corresponding spot welding station 101A and forming a resistance spot, the resistance spots are arranged at intervals, that is, the battery core is sequentially conveyed to the at least two spot welding mechanisms 210A on the transmission line 100A, and the eccentric welding pin 10 of the at least two spot welding mechanisms 210A is matched with the displacement assembly 211A to perform at least two times of spot welding, so that at least two resistance spots arranged at intervals are formed on the battery core, that the formation of a plurality of spots on the battery core is realized, and the plurality of spots on the battery core are formed independently in sequence, thereby reducing the size error of the welding pins, further making the welding pin containing a plurality of spots actually stable and improving the stability of the formation of the multi-spot welding pads of the battery core and the resistance welding, and improving the stability of the spot welding.

In one embodiment, each spot welding mechanism further comprises a loading station, a central hole detection station, a welding detection station and a blanking station, wherein the loading station, the central hole detection station, the resistance welding seats of the at least two spot welding mechanisms, the welding detection station and the blanking station are sequentially arranged along the conveying line. It can be understood that the feeding station, the central hole detection station, the resistance welding seats of the at least two spot welding mechanisms, the welding detection station and the blanking station are sequentially arranged along the transmission line, so that the automatic detection and adjustment of the hard shell column type battery are realized, and the quality and the welding efficiency of the hard shell column type battery are ensured.

In one embodiment, each spot welding mechanism further comprises a clamp, the clamp is connected to the transmission line and is respectively arranged corresponding to the feeding station, the central hole detection station, the resistance welding seats of the at least two spot welding mechanisms, the welding detection station and the blanking station, and the clamp is used for clamping and arranging the hard shell column type battery semi-finished product, so that the positioning accuracy and the positioning stability of the hard shell column type battery and the welding station are well realized, and the welding accuracy of the hard shell column type battery is further well ensured.

Referring to fig. 1, 2 and 3 together, in one embodiment, the displacement assembly 211A of each spot welding mechanism 210A includes a driving member 2113, an adjusting member 2111 and a locking member 2112 connected to the adjusting member 2111, the driving member 2113 of the displacement assembly 211A of each spot welding mechanism 210A is connected to the corresponding resistance welding seat 212A, the power output end of the driving member 2113 of the displacement assembly 211A of each spot welding mechanism 210A is connected to the corresponding adjusting member 2111, the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A is slidably connected to the corresponding resistance welding seat 212A, the eccentric welding pin 10 of each spot welding mechanism 210A is connected to the corresponding adjusting member 2111, and the eccentric welding pin 10 of each spot welding mechanism 210A is slid in a direction to or away from the corresponding spot welding station 101A through the corresponding adjusting member 2111 and the locking member 2112, respectively. It can be understood that the adjustment member 2111 is connected to the locking member 2112, so that the moving direction of the adjustment member 2111 is the same as the moving direction of the locking member 2112, the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A is slidably connected to the corresponding resistance welding seat 212A, and the extending direction of the face of the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A, which is connected to the corresponding resistance welding seat 212A, is the same as the direction approaching or departing from the corresponding spot welding station 101A, i.e., the locking member 2112 moves toward or away from the corresponding spot welding station 101A, so that the locking member 2112 drives the adjustment member 2111 to move toward or away from the corresponding spot welding station 101A, thereby achieving the spot welding.

Referring to fig. 1, 2 and 3 together, in one embodiment, the adjustment part 2111 of the displacement assembly 211A of each spot welding mechanism 210A includes a first adjustment part 2114 and a second adjustment part 2115, the first adjustment part 2114 and the second adjustment part 2115 of the adjustment part 2111 of the displacement assembly 211A of each spot welding mechanism 210A are connected to the corresponding locking part 2112, the first adjustment part 2114 and the second adjustment part 2115 of the adjustment part 2111 of the displacement assembly 211A of each spot welding mechanism 210A are connected to the power output end of the corresponding driving part 2113, one end of the eccentric welding pin 10 of each spot welding mechanism 210A is connected to the corresponding first adjustment part 2114, and the other end of the eccentric welding pin 10 of each spot welding mechanism 210A is inserted into the second adjustment part 2115, and the eccentric welding pin 10 of each spot welding mechanism 210A slides through the corresponding first adjustment part 2114 and the locking part 2112 toward or away from the corresponding spot welding station 211101A. It can be understood that the first adjustment portion 2114 is connected to the eccentric welding needle 10, so that the moving direction of the first adjustment portion 2114 is the same as the moving direction of the eccentric welding needle 10, and the first adjustment portion 2114 moves toward the direction approaching or separating from the corresponding spot welding station 101A, so that the first adjustment portion 2114 drives the eccentric welding needle 10 to move toward the direction approaching or separating from the corresponding spot welding station 101A, thereby performing spot welding.

Referring to fig. 1, 2 and 3, in one embodiment, the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A includes a first locking portion 2116 and a second locking portion 2117, the first locking portion 2116 and the second locking portion 2117 of the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A are slidably connected to the corresponding spot resistance welding holder 212A, the first locking portion 2116 of the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A is connected to the corresponding first adjustment portion 2114, the second locking portion 2117 of the locking member 2112 of the displacement assembly 211A of each spot welding mechanism 210A is connected to the corresponding second adjustment portion 2115, and the eccentric welding pin 10 of each spot welding mechanism 210A is slidably moved toward or away from the corresponding spot welding station 101A by the corresponding first adjustment portion 2114 and first locking member 2112, respectively. It can be understood that the first adjustment portion 2114 is slidably connected to the resistance welding seat 212A through the first locking portion 2116, so as to drive the eccentric welding pin 10 to move towards or away from the corresponding spot welding station 101A, thereby achieving spot welding.

Referring to fig. 4 and 5, in one embodiment, each spot welding mechanism 210A further includes a welding pin protection housing 214A, the second adjustment portion 2115 of the adjustment member 2111 of the displacement assembly 211A of each spot welding mechanism 210A is connected to the corresponding welding pin protection housing 214A, and the eccentric welding pin 10 of each spot welding mechanism 210A is embedded on the corresponding welding pin protection housing 214A when the eccentric welding pin 10 is disposed away from the corresponding spot welding station 101A. It is understood that the second regulating portion 2115 serves to fix the needle protecting case 214A, and the needle protecting case 214A serves to protect the eccentric welding needle 10, thereby ensuring the spot welding effect of the eccentric welding needle 10, and thus the spot welding effect of the intermittent multi-spot welding apparatus 10A for under welding.

Referring to fig. 4 and 5 together, in one embodiment, the welding pin protection housing 214A of each spot welding mechanism 210A includes a top housing member 2141, a bottom housing member 2142, and a side housing member 2143, the side housing member 2143 of the welding pin protection housing 214A of each spot welding mechanism 210A is connected to the corresponding second adjustment portion 2115, the top housing member 2141 and the corresponding bottom housing member 2142 of the welding pin protection housing 214A of each spot welding mechanism 210A are respectively disposed at two ends of the corresponding side housing member 2143, the side housing member 2143 of the welding pin protection housing 214A of each spot welding mechanism 210A is disposed around the free end of the corresponding eccentric welding pin 10 when the corresponding eccentric welding pin 10 is disposed away from the corresponding spot welding station 101A, and the free end of the eccentric welding pin 10 of each spot welding mechanism 210A penetrates the corresponding top housing member 2141 and is located between the corresponding top housing member 2141 and the corresponding bottom housing member 2142 when the corresponding eccentric welding pin 10 is disposed away from the corresponding spot welding station 101A. It can be understood that when the eccentric welding pin 10 is far away from the spot welding station 101A, the free end of the eccentric welding pin 10 is surrounded by the top shell part 2141, the side shell part 2143 and the bottom shell part 2142, so as to protect the eccentric welding pin 10 and further ensure the spot welding effect of the eccentric welding pin 10, so as to ensure the spot welding effect of the intermittent multi-spot welding equipment 10A for bottom welding, and to protect the eccentric welding pin 10 from dust, thereby avoiding the pollution problem caused by the contact of the eccentric welding pin 10 and the hard-shell column type battery, and further ensuring the quality of the battery.

Referring to fig. 4 and 5, in one embodiment, the top case 2141 of the needle protection case 214A of each spot welding mechanism 210A is provided with a first needle outlet 201A, the bottom case 2142 of the needle protection case 214A of each spot welding mechanism 210A is provided with a second needle outlet 202a, the free end of the eccentric needle 10 of each spot welding mechanism 210A is inserted into the corresponding first needle outlet 201A when the corresponding eccentric needle 10 is disposed away from the corresponding spot welding station 101A, and the free end of the eccentric needle 10 of each spot welding mechanism 210A is inserted into the second needle outlet 202a when the corresponding eccentric needle 10 is disposed adjacent to the corresponding spot welding station 101A. It can be understood that when the eccentric welding pin 10 is far away from the spot welding station 101A, the free end of the eccentric welding pin 10 is disposed between the first welding pin outlet 201A and the second welding pin outlet 202a, that is, the free end of the eccentric welding pin 10 is surrounded by the top casing member 2141, the side casing member 2143, and the bottom casing member 2142, so as to protect the eccentric welding pin 10 and ensure the spot welding effect of the eccentric welding pin 10, thereby ensuring the spot welding effect of the intermittent multi-spot welding equipment 10A for bottom welding, and also play a role of dust prevention for the eccentric welding pin 10, thereby avoiding the contamination problem caused by the contact between the eccentric welding pin 10 and the hard-shell column battery, thereby ensuring the quality of the battery, and when the eccentric welding pin 10 is near the spot welding station 101A, the free end of the eccentric welding pin 10 penetrates through the second welding pin outlet 202a to movably abut against the hard-shell column battery, thereby further ensuring the spot welding effect of the eccentric welding pin 10, and further ensuring the spot welding effect of the intermittent multi-spot welding equipment 10A for bottom welding.

Referring to fig. 4 and 5, in one embodiment, a calibration piece is disposed on a side of the top housing member 2141 of the welding pin protection housing 214A of each spot welding mechanism 210A away from the corresponding side housing member 2143, the calibration piece of each spot welding mechanism 210A is connected to the corresponding top housing member 2141, the calibration piece of each spot welding mechanism 210A is disposed adjacent to or spaced apart from the corresponding eccentric welding pin 10, and a plane of the calibration piece of each spot welding mechanism 210A is parallel to a central axis of the corresponding eccentric welding pin 10. It can be understood that the calibration sheet is used to calibrate the position of the eccentric welding pin 10 so that the eccentric welding pin 10 is well abutted against the hard shell column type battery, thereby further ensuring the spot welding effect of the eccentric welding pin 10, and thus further ensuring the spot welding effect of the intermittent multi-spot welding apparatus for bottom welding 10A.

In one embodiment, the top shell member, the side shell member, the bottom shell member and the calibration sheet of the welding needle protection shell of each spot welding mechanism are of an integrally formed structure. It can be understood that the second regulating part clamps the side shell part, therefore, the position of the side shell part is accurate, and the top shell part, the side shell part, the bottom shell part and the calibration piece are of an integrated structure, the position of the calibration piece is accurate, and the calibration piece is used for calibrating the position of the eccentric welding needle, thereby further ensuring the spot welding effect of the eccentric welding needle, further ensuring the spot welding effect of the intermittent multi-welding-point welding equipment for bottom welding, and effectively improving the connection stability and the connection compactness of the top shell part, the side shell part, the bottom shell part and the calibration piece, and further effectively improving the structural stability and the structural compactness of the spot welding mechanism.

Referring to fig. 6 to 8 together, in one embodiment, the eccentric welding pin includes a welding pin body 100, a welding pin transition body 200, and an eccentric spot welding body 300. One end of the welding pin transition body 200 is fixed to the welding pin body 100. The eccentric spot welding body 300 and one end of the welding pin transition body 200, which is far away from the welding pin body 100, are fixed, the central axis of the welding pin body 100 is parallel to but not coincident with the central axis of the eccentric spot welding body 300, one end of the eccentric spot welding body 300, which is far away from the welding pin transition body 200, is provided with a spot welding surface 1041, and the spot welding surface 1041 is vertically penetrated through by the central axis of the eccentric spot welding body 300. When the extending directions of the welding pin body 100 and the eccentric spot welding body 300 are both perpendicular to the horizontal plane, the projection of the eccentric spot welding body 300 on the horizontal plane is located within the projection of the welding pin body 100 on the horizontal plane.

In the above-mentioned eccentric welding pin 10, the central axis of the welding pin body 100 is parallel to but not coincident with the central axis of the eccentric spot welding body 300, that is, the central axis of the eccentric spot welding body 300 is not coincident with the central axis of the welding pin body 100, so that when the eccentric welding pin 10 rotates with the central axis of the welding pin body 100 as a rotating axis, or a battery roll core disposed opposite to the eccentric welding pin 10 rotates with the central axis of the welding pin body 100 as a rotating axis, multi-point spot welding of a tab of the battery roll core can be realized, in addition, when the extending directions of the welding pin body 100 and the eccentric spot welding body 300 are both perpendicular to the horizontal plane, the projection of the eccentric spot welding body 300 on the horizontal plane is located in the projection of the welding pin body 100 on the horizontal plane, realized eccentric welding needle 10 when getting into electric core centre bore, the welding needle body 100 periphery of eccentric welding needle 10 and the pore wall butt of electric core centre bore, and the eccentric spot welding body 300 of eccentric welding needle 10 is located electric core centre bore, that is to say, realized that the aperture size of electric core centre bore set up only according to support welding needle body 100 get into can, the aperture that needs increase electric core centre bore has been alleviateed, and then realize that concentric tapering welding needle forms a plurality of solder joints on battery tab, but can cause the problem of the energy density reduction of battery, better guaranteed to roll up the aperture of core centre bore at electric core centre bore when less, promptly under the circumstances of guaranteeing that the battery has higher energy density, realized rolling up the multiple spot welding of core utmost point ear to the battery.

It should be noted that the welding pin body of the eccentric welding pin of each spot welding mechanism is connected with the corresponding displacement assembly; or the like, or, alternatively,

the welding pin body of the eccentric welding pin of each spot welding mechanism is connected with the corresponding adjusting piece; or the like, or, alternatively,

one end of the welding needle body of the eccentric welding needle of each spot welding mechanism is connected with the corresponding first adjusting piece, and the welding needle transition body and the eccentric spot welding body of the eccentric welding needle of each spot welding mechanism penetrate through the corresponding second adjusting piece.

In one embodiment, the welding pin body and the welding pin transition body are of an integrally formed structure. It can be understood that the welding pin body and the welding pin transition body are of an integrated structure, connection stability and connection compactness of the welding pin body and the welding pin transition body are effectively improved, and structural stability and structural compactness of the eccentric welding pin for bottom welding are further effectively improved.

In one embodiment, the welding needle transition body and the eccentric spot welding body are of an integrally formed structure. The welding needle transition body and the eccentric spot welding body are of an integrated structure, so that the connection stability and the connection compactness of the welding needle transition body and the eccentric spot welding body are effectively improved, and the structural stability and the structural compactness of the eccentric welding needle for bottom welding are further effectively improved.

Referring to fig. 6 to 8, in one embodiment, the eccentric spot welding body 300 is provided with a first end 103 and a second end 104 opposite to each other, the first end 103 is connected to the pin transition body 200, the spot welding surface 1041 is provided on the second end 104, and the volume of the eccentric spot welding body 300 is gradually reduced in a direction from the first end 103 to the second end 104. It can be understood that the volume of the eccentric spot welding body 300 in the direction from the first end 103 to the second end 104 is gradually reduced, that is, the area of the cross section of the eccentric spot welding body 300 in the direction from the first end 103 to the second end 104 is gradually reduced, that is, the eccentric spot welding body 300 is gradually reduced in the direction from the first end 103 to the second end 104, and the spot welding surface 1041 is disposed on the second end 104, so that the area of the spot welding surface 1041 is smaller, that is, the eccentric spot welding body 300 sequentially forms welding spots on at least two welding sub-areas of the cell tab is realized, and the structural strength of the eccentric spot welding body 300 is ensured.

Referring to fig. 6 to 8, in one embodiment, the welding pin transition body 200 is provided with a front end 101 and a rear end 102 opposite to each other, the front end 101 of the welding pin transition body 200 is connected to the welding pin body 100, the rear end 102 of the welding pin transition body 200 is connected to the first end 103 of the eccentric spot welding body 300, and the volume of the welding pin transition body 200 is gradually reduced in a direction from the front end 101 to the rear end 102. It can be understood that, when the extending directions of the welding pin body 100 and the eccentric spot welding body 300 are both perpendicular to the horizontal plane, the projection of the eccentric spot welding body 300 on the horizontal plane is located in the projection of the welding pin body 100 on the horizontal plane, the volume of the eccentric spot welding body 300 is smaller than that of the welding pin body 100 under the same length, and the volume of the welding pin transition body 200 in the direction from the front end 101 to the rear end 102 is gradually reduced, that is, the area of the cross section of the welding pin transition body 200 in the direction from the front end 101 to the rear end 102 is gradually reduced, that is, the contact connection area of the welding pin transition body 200 with the welding pin body 100 and the eccentric spot welding body 300 is increased to the maximum extent under the condition that the volume of the welding pin body 100 and the eccentric spot welding body 300 is well transited, so that the connection stability of the welding pin transition body 200 with the welding pin body 100 and the eccentric spot welding body 300 is well ensured, and the structural strength and the structural stability of the eccentric spot welding pin 10 are well ensured.

In one embodiment, when the extending directions of the welding pin body and the welding pin transition body are both perpendicular to the horizontal plane, the projection of the welding pin transition body on the horizontal plane is positioned in the projection of the welding pin body on the horizontal plane. It can be understood that, end welding is with eccentric welding needle when getting into electric core centre bore, end welding is with the pore wall butt of the welding needle body periphery and the electric core centre bore of eccentric welding needle, and end welding is with the welding needle transition position of eccentric welding needle in electric core centre bore, that is to say, the setting up of the aperture size of electric core centre bore only according to support the welding needle body get into can, it is less when the aperture of the core centre bore is rolled up in electric core centre bore further to have ensured, under the condition that ensures that the battery has higher energy density promptly, the multiple spot welding to the core utmost point ear of battery roll has been realized.

In one embodiment, when the extending directions of the welding pin transition body and the eccentric spot welding body are both vertical to the horizontal plane, the projection of the eccentric spot welding body on the horizontal plane is positioned in the projection of the welding pin transition body on the horizontal plane. It can be understood that when the extending direction of the welding needle body, the welding needle transition body and the eccentric spot welding body is perpendicular to the horizontal plane, the projection of the welding needle transition body on the horizontal plane is positioned in the projection of the welding needle body on the horizontal plane, the projection of the eccentric spot welding body on the horizontal plane is positioned in the projection of the welding needle transition body on the horizontal plane, namely, the volume of the eccentric welding needle for bottom welding is gradually reduced in the direction of the welding needle body towards the eccentric spot welding body, and the structural stability of the eccentric welding needle for bottom welding is further ensured.

Referring to fig. 6 to 7, in one embodiment, the spot welding surface 1041 is an arc surface. It can be understood that the arcwall face is the curved surface, and the arcwall face makes eccentric spot welding body 300 contact the solder joint from the great area of a plurality of angles to ensured that end welding is with the welding effect of eccentric welding needle 10, simultaneously, the stress distribution of arcwall face is comparatively even, and spot welding face 1041 is the arcwall face, has ensured that the stress distribution of solder joint is comparatively even.

In one embodiment, the eccentric spot welding body 300 is provided with a circumferential compensation block 400, and the circumferential compensation block 400 is connected to the spot welding surface 1041. It can be understood, because eccentric spot welding body 300 can take place certain wearing and tearing at the in-process of spot welding, and then influence the butt area of contact of eccentric spot welding body 300 and electric core utmost point ear, and then influence the welding effect of solder joint, and after eccentric spot welding body 300 wearing and tearing are more serious, if need change eccentric spot welding body 300, then need whole replacement eccentric welding needle 10, cause the spot welding cost of electric core to be higher, and circumference compensation piece 400's setting, realized under the more serious condition of wearing and tearing of circumference compensation piece 400, only change circumference compensation piece 400 can realize the alleviate of the welding effect's of solder joint influence, and then reduced the spot welding cost of electric core.

Referring to fig. 6 to 7, in one embodiment, the circumferential compensation block 400 includes a wear-resistant insulator 410 and a compensation body 420, the wear-resistant insulator 410 is connected to the outer periphery of the eccentric spot welding body 300, and when the extending directions of the wear-resistant insulator 410 and the welding pin body 100 are both perpendicular to the horizontal plane, the projection of the wear-resistant insulator 410 on the horizontal plane is located in the projection of the welding pin body 100 on the horizontal plane, the wear-resistant insulator 410 is provided with a clamping groove 401, the compensation body 420 is clamped on the clamping groove 401, and an end surface of the compensation body 420 away from the eccentric spot welding body 300 and an end surface of the wear-resistant insulator 410 are located in the same arc surface. In one embodiment, although the effect of welding the welding spot can be reduced by only replacing the circumferential compensation block 400, the spot welding efficiency of the battery cell can be affected in the process of replacing the circumferential compensation block 400, and the labor cost of spot welding of the battery cell can be increased, further, in order to improve the spot welding efficiency of the battery cell and reduce the spot welding cost of the battery cell, the wear-resistant insulator 410 is connected to the periphery of the eccentric spot welding body 300, and when the extending directions of the wear-resistant insulator 410 and the welding pin body 100 are both perpendicular to the horizontal plane, the projection of the wear-resistant insulator 410 on the horizontal plane is located in the projection of the welding pin body 100 on the horizontal plane, the wear-resistant insulator 410 is provided with the clamping groove 401, the compensation body 420 is clamped on the clamping groove 401, and one end face of the compensation body 420, which is far away from the eccentric spot welding body 300, is located in the same arc plane as one end face of the wear-resistant insulator 410, namely, the compensation body 420 can be in abutting contact with the pole lug of the battery cell, and the wear-resistant of the compensation block 400 can be resisted, and the wear-resistant of the compensation body 410 can be better under the condition that the spot welding performance of achieving the spot welding of the circumferential compensation block 400 is better, and the spot welding efficiency of the spot welding of the battery cell can be reduced.

In one embodiment, the end face of the wear-resistant insulator remote is located between the end face of the compensation body remote from the eccentric spot welding body and the spot welding face. It can be understood that, because the circumferential compensation block is processed by processing equipment, therefore, the processed circumferential compensation block has more or less processing errors, namely, a terminal surface of the compensation body far away from the eccentric spot welding body and a terminal surface of the wear-resistant insulator are positioned in the same arc surface, namely, a condition that a terminal surface of the compensation body far away from the eccentric spot welding body is positioned between a terminal surface of the wear-resistant insulator and the spot welding surface exists, further, the circumferential compensation block loses the spot welding effect, further, the welding spot efficiency of the cell core is influenced, and the detection workload of the cell core spot welding is increased, therefore, in the application, a terminal surface of the wear-resistant insulator far away from the eccentric spot welding body is positioned between a terminal surface of the compensation body far away from the eccentric spot welding body and the spot welding surface, namely, the influence of the processing accuracy of the circumferential compensation block on the cell core spot welding effect is reduced, a terminal surface of the compensation body far away from the eccentric spot welding body and a terminal surface of the wear-resistant insulator are positioned in the same arc surface, after slight wear resistance of the wear-resistant body can be ensured, and further, the performance of the circumferential compensation block is better, and the cost of the cell core spot welding can be reduced.

In one embodiment, the compensation body and the eccentric spot welding body are of an integrally formed structure. It can be understood that the compensation body and the eccentric spot welding body are of an integrated structure, so that the connection stability and the connection compactness of the compensation body and the eccentric spot welding body are improved well, and further the structural stability and the structural compactness of eccentric welding are realized well.

In one embodiment, the wear-resistant insulator is a silica gel insulator, a polytetrafluoroethylene insulator or a modified polyformaldehyde insulator, so that the wear-resistant insulator can better resist the wear of the compensation body, the wear resistance of the circumferential compensation block can be better realized under the condition that the spot welding performance of the circumferential compensation block is better realized, and the spot welding efficiency of the battery cell can be better improved and the spot welding cost of the battery cell can be better reduced.

In one embodiment, the pin body is an alumina copper pin body. It can be understood that, in the eccentric welding needle for the bottom welding, the welding needle body is an alumina copper welding needle body, and alumina copper has higher structural strength, and then the structural strength of the eccentric welding needle for the bottom welding is ensured.

In one embodiment, the pin transition body is an alumina copper pin transition body. It can be understood that the welding needle body and the eccentric spot welding body are connected through the welding needle transition body, therefore, the structural strength of the welding needle transition body ensures the service life of the eccentric welding needle for bottom welding, and the aluminum oxide copper has higher structural strength, so that the welding needle transition body is the aluminum oxide copper welding needle transition body, and the aluminum oxide copper welding needle transition body ensures the service life of the eccentric welding needle for bottom welding.

In one embodiment, the eccentric spot welding body is an aluminum oxide copper eccentric spot welding body. It can be understood that during welding, the lug and the hard shell are both connected with the eccentric spot welding body, so that the eccentric spot welding body is easily abraded during welding, the eccentric spot welding body is an aluminum oxide copper eccentric spot welding body, and aluminum oxide copper has better wear resistance, so that the abrasion of the eccentric spot welding body is reduced, and the service life of the eccentric welding needle for bottom welding is further ensured.

Compared with the prior art, the utility model discloses at least, following advantage has:

the utility model discloses a many solder joints welding equipment of intermittent type formula 10A for the end welding, make resistance weld holder 212A of two at least spot welding mechanisms 210A set up along the direction of transportation of the hard shell column type battery on transmission line 100A in proper order, and each spot welding mechanism 210A's eccentric welding needle 10 moves towards keeping away from near corresponding spot welding station 101A through displacement subassembly 211A, and the free end of each spot welding mechanism 210A's eccentric welding needle 10 is used for carrying out the end welding and forming resistance solder joint to the hard shell column type battery of placing on the spot welding station 101A that corresponds, each resistance solder joint is the interval setting each other, make electric core convey to two at least spot welding mechanisms 210A department on transmission line 100A in proper order, and by two at least spot welding mechanisms 210A's eccentric welding needle 10 cooperation displacement subassembly 211A of spot welding twice at least and make to form the resistance that two at least mutual intervals set up on the electric core, realized the formation of a plurality of solder joints on the electric core, and a plurality of solder joints are independently formed for in proper order, there is because of processing there is size error in the soldering needle, and then make the welding needle that contains a plurality of electric core stability make and make the electric core form the stability and each more stable ground of electric core and each resistance spot welding point form the problem of the resistance welding point connection that the resistance welding point that the electric core, and each spot welding has improved.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a bottom welding is with intermittent type formula multiple spot welding equipment which characterized in that includes:

the transmission line is used for sequentially transmitting the hard shell column type batteries, and at least two spot welding stations are arranged on the transmission line;

the intermittent multi-welding-point welding device comprises at least two spot welding mechanisms, each spot welding mechanism comprises a resistance welding seat, a displacement assembly and an eccentric welding needle, the resistance welding seats are connected with the displacement assemblies in a sliding mode, and the eccentric welding needles are connected with the displacement assemblies; and

the resistance welding seats of the at least two spot welding mechanisms are sequentially arranged along the conveying direction of the hard shell column type batteries on the transmission line, the eccentric welding pins of the at least two spot welding mechanisms are used for being in one-to-one correspondence with the at least two spot welding stations, the eccentric welding pins of each spot welding mechanism move towards the spot welding stations far away from and close to the spot welding stations corresponding to the eccentric welding pins through the displacement assembly, the free ends of the eccentric welding pins of each spot welding mechanism are used for performing bottom welding on the hard shell column type batteries placed on the corresponding spot welding stations and forming resistance welding spots, and the resistance welding spots are arranged at intervals.

2. The intermittent multi-spot welding apparatus for bottom welding according to claim 1, wherein said displacement assembly of each of said spot welding mechanisms includes a driving member, an adjusting member and a locking member connected to said adjusting member, wherein said driving member of said displacement assembly of each of said spot welding mechanisms is connected to said corresponding resistance welding holder, wherein a power output end of said driving member of said displacement assembly of each of said spot welding mechanisms is connected to said corresponding adjusting member, wherein said locking member of said displacement assembly of each of said spot welding mechanisms is slidably connected to said corresponding resistance welding holder, wherein said eccentric welding pin of each of said spot welding mechanisms is connected to said corresponding adjusting member, and wherein said eccentric welding pin of each of said spot welding mechanisms is slidably moved in a direction approaching or moving away from said corresponding spot welding station by said corresponding adjusting member and said locking member, respectively.

3. The intermittent multi-spot welding apparatus for bottom welding according to claim 2, wherein the adjusting member of the displacement assembly of each of the spot welding mechanisms includes a first adjusting portion and a second adjusting portion, the first adjusting portion and the second adjusting portion of the adjusting member of the displacement assembly of each of the spot welding mechanisms are connected to the corresponding locking member, the first adjusting portion and the second adjusting portion of the adjusting member of the displacement assembly of each of the spot welding mechanisms are connected to a power output end of the corresponding driving member, one end of the eccentric welding pin of each of the spot welding mechanisms is connected to the corresponding first adjusting portion, and the other end of the eccentric welding pin of each of the spot welding mechanisms is inserted into the second adjusting portion, and the eccentric welding pin of each of the spot welding mechanisms slides in a direction approaching or separating from the corresponding spot welding station through the corresponding first adjusting portion and the locking member, respectively.

4. The intermittent multi-spot welding apparatus for bottom welding according to claim 3, wherein said locking member of said displacement assembly of each of said spot welding mechanisms includes a first locking portion and a second locking portion, said first locking portion and said second locking portion of said locking member of said displacement assembly of each of said spot welding mechanisms are slidably connected to said corresponding resistance welding holder, said first locking portion of said locking member of said displacement assembly of each of said spot welding mechanisms is connected to said corresponding first adjusting portion, said second locking portion of said locking member of said displacement assembly of each of said spot welding mechanisms is connected to said corresponding second adjusting portion, and said eccentric welding pin of each of said spot welding mechanisms is slid in a direction toward or away from said corresponding spot welding station by said corresponding first adjusting portion and first locking member, respectively.

5. The intermittent multi-spot welding device for bottom welding according to claim 3, wherein each of the spot welding mechanisms further comprises a welding pin protection case, the second adjusting portion of the adjusting member of the displacement assembly of each of the spot welding mechanisms is connected with the corresponding welding pin protection case, and the eccentric welding pin of each of the spot welding mechanisms is embedded in the corresponding welding pin protection case when the eccentric welding pin is disposed away from the corresponding spot welding station.

6. The intermittent multi-spot welding apparatus for bottom welding according to claim 5, wherein said welding pin protection housing of each of said spot welding mechanisms includes a top housing member, a bottom housing member, and a side housing member, said side housing member of said welding pin protection housing of each of said spot welding mechanisms is connected to said corresponding second regulating portion, said top housing member and said corresponding bottom housing member of said welding pin protection housing of each of said spot welding mechanisms are respectively disposed at both ends of said corresponding side housing member, said side housing member of said welding pin protection housing of each of said spot welding mechanisms is disposed around a free end of said corresponding eccentric welding pin when said corresponding eccentric welding pin is disposed away from said corresponding spot welding station, and a free end of said eccentric welding pin of each of said spot welding mechanisms is inserted through said corresponding top housing member and is located between said corresponding top housing member and said corresponding bottom housing member when said corresponding eccentric welding pin is disposed away from said corresponding spot welding station.

7. The intermittent multi-spot welding device for bottom welding according to claim 6, wherein the top case member of the needle protection case of each spot welding mechanism is provided with a first needle outlet, the bottom case member of the needle protection case of each spot welding mechanism is provided with a second needle outlet, a free end of the eccentric needle of each spot welding mechanism is inserted into the corresponding first needle outlet when the corresponding eccentric needle is disposed away from the corresponding spot welding station, and a free end of the eccentric needle of each spot welding mechanism is inserted into the second needle outlet when the corresponding eccentric needle is disposed adjacent to the corresponding spot welding station.

8. The intermittent multi-spot welding device for bottom welding according to claim 6, wherein a calibration piece is disposed on a side of the top case member of the needle protection case of each spot welding mechanism away from the corresponding side case member, the calibration piece of each spot welding mechanism is connected to the corresponding top case member, the calibration piece of each spot welding mechanism is disposed adjacent to or spaced apart from the corresponding eccentric needle, and a plane on which the calibration piece of each spot welding mechanism is disposed is parallel to a central axis of the corresponding eccentric needle.

9. The intermittent multi-spot welding apparatus for the bottom welding according to claim 8, wherein said top case member, said side case member, said bottom case member and said calibration piece of said welding pin protection case of each of said spot welding mechanisms are of an integrally formed structure.

10. The intermittent multi-spot welding apparatus for the bottom welding according to claim 1, wherein each of said spot welding mechanisms further comprises a loading station, a center hole detection station, a welding detection station, and a blanking station, said loading station, said center hole detection station, said resistance holders of at least two of said spot welding mechanisms, said welding detection station, and said blanking station being disposed along said transfer line in sequence.

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