CN214443862U

CN214443862U - Positioning device for welding operation at bottom of lithium battery

Info

Publication number: CN214443862U
Application number: CN202120317314.XU
Authority: CN
Inventors: 常海涛; 李治农; 郑基能; 陆行
Original assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Current assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-10-22
Anticipated expiration: 2031-02-04

Abstract

The utility model discloses a positioning device for welding operation of the bottom of a lithium battery, which comprises a base, wherein the upper surface of the base is vertically provided with a side plate, and the side surface of the side plate is provided with a linear channel with an arc-shaped cross section along the vertical direction; set up a ejector pin channel that runs through the base upper and lower surface on the base of every sharp channel below, the longitudinal section of ejector pin channel is "protruding" style of calligraphy, and it has an ejector pin to slide nested in the ejector pin channel, and the bottom plate is installed to the bottom of base, installs a spring between the bottom of bottom plate and ejector pin, and the upper shed end of ejector pin channel is stretched out to the head end of ejector pin, and the area of the head end of ejector pin slightly is less than the area of battery steel casing open end portion. The bottom of battery box hat is back-off in the head end of ejector pin up before welding operation, the contact of the head end of laminate polymer core and ejector pin, gliding stroke about the ejector pin is for the limit with the upper surface that the bottom of guaranteeing the battery box hat surpasss the curb plate all the time. The positioning device is compact in structure and reliable in positioning, and the working efficiency of welding operation at the bottom of the lithium battery is improved.

Description

Positioning device for welding operation at bottom of lithium battery

Technical Field

The utility model relates to a battery processing equipment especially relates to a positioner that is used for lithium cell bottom welding operation.

Background

The lithium battery structure includes soft-packaged electrical core and box hat, and during the equipment, the utmost point ear that soft-packaged electrical core is located box hat bottom surface one side needs and the box hat bottom surface inside wall forms the electricity and connects. The conventional assembly scheme is that firstly, the foamed nickel is welded on the lug of the soft-package battery cell, then the soft-package battery cell is packaged into the steel shell, and the foamed nickel is attached to the inner side wall of the bottom surface of the steel shell by extruding the soft-package battery cell. The electric connection structure has the disadvantages that after the battery is vibrated at high strength, a gap is possibly formed between the inner tab and the steel shell to cause open circuit or poor contact, so that the reject ratio of products in the production process is increased, and the production cost is increased; and the soft package battery core can also have local current collector deformation in the extrusion process to make the active material drop and the dislocation of the anode material and the cathode material, so that potential safety hazards exist.

In order to overcome the defect of the electric connection structure between the soft package battery cell and the inner side wall of the bottom surface of the steel shell at present, a tab and the inner side wall of the bottom surface of the steel shell can be welded and fixed by using a laser welding machine, but how to fix the semi-finished lithium battery in welding operation becomes the first problem in the process of renovating and assembling the process.

Disclosure of Invention

An object of the utility model is to provide a positioner for lithium cell bottom welding operation.

Realize the utility model discloses the technical scheme of purpose is: a positioning device for welding operation of the bottom of a lithium battery comprises a base, wherein at least one side plate is vertically arranged on the upper surface of the base, at least one linear channel is arranged on the side surface of each side plate along the vertical direction, adjacent linear channels are arranged in parallel at intervals, the cross section of each linear channel is arc-shaped, the arc radius of each linear channel is slightly larger than the radius of a battery steel shell, and the arc length of the cross section of each linear channel is limited by the fact that the battery steel shell is not easy to fall off the linear channel when sliding on the linear channel; the base below each linear channel is provided with an ejector rod channel which penetrates through the upper surface and the lower surface of the base and is communicated with the linear channel, the longitudinal section of each ejector rod channel is in a convex shape, an ejector rod used for bearing a soft package battery core in a battery steel shell is nested in the ejector rod channel in a sliding manner, the longitudinal section of each ejector rod is in a convex shape, the bottom of the base is fixedly provided with a bottom plate used for plugging the bottom of the ejector rod channel, a spring is arranged between the bottom plate and the bottom of the ejector rod, one end of the spring is fixedly connected with the inner side surface of the bottom plate, the other end of the spring is contacted with the bottom of the ejector rod, the head end of each ejector rod extends out of the upper opening end of the ejector rod channel, and the area of the head end of each ejector rod is slightly smaller than that of the opening end of the battery steel shell; the bottom of battery steel casing back-off up in the head end of ejector pin before the welding operation, the contact of the head end of laminate polymer core and ejector pin, the top rod is limited in the upper surface that the bottom of ejector pin gliding stroke exceeds the curb plate all the time in the ejector pin channel from top to bottom.

Furthermore, a groove is formed in the center of the bottom of the ejector rod, and a contact end of the spring and the ejector rod is embedded in the groove.

Furthermore, a positioning pin groove is vertically formed in the surface of one side, away from the side plate, of the ejector rod, and a positioning pin horizontally penetrates through the base and is in sliding connection with the positioning pin groove. Used for guiding the stroke of the mandril.

Furthermore, the side wall of the linear channel is embedded with a magnet for adsorbing the battery steel shell in the linear channel, so that the stability of welding operation is improved.

Furthermore, the cross section of the linear channel is in a semi-circular arc shape, and the battery steel shell is more convenient to assemble and disassemble through the cooperation of the semi-circular arc shape and the magnet.

The utility model discloses the positioner's that realizes ejector pin channel and bottom plate can prevent that the ejector pin from deviating from, the head end of ejector pin and the accommodation space of sharp channel formation battery steel casing, laser-beam welding machine head presses down the steel casing and realizes battery steel casing bottom inner wall and this department utmost point ear gasket in close contact with during welding operation, the spring can play the effect of buffering when the battery steel casing bottom is pressed to laser-beam welding machine head, cause destruction to the terminal side soft-packaged electrical core of opening when avoiding pressing, the area of the head end of ejector pin slightly is lighter than the area of battery steel casing opening tip, can let this utmost point ear of side hang down naturally when welding operation, avoid the welding machine to press the in-process, anodal utmost point ear is buckled and is made its and steel casing contact causes the short circuit. The positioning device is compact in structure and reliable in positioning, and the working efficiency of welding operation at the bottom of the lithium battery is improved.

Drawings

Fig. 1 is a schematic front view of a positioning device for welding operation of the bottom of a lithium battery according to an embodiment of the present invention;

fig. 2 is a schematic top view of a positioning device for welding operation of the bottom of a lithium battery according to an embodiment of the present invention;

FIG. 3 is a schematic sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic view of the structure of the top rod according to the embodiment of the present invention.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1 to 3, a positioning device for welding operation of the bottom of a lithium battery comprises a base 1, wherein two side plates 2 are vertically arranged on an upper surface 11 of the base 1, a plurality of linear channels 21 are arranged on the side surface of each side plate 2 along the vertical direction, the adjacent linear channels 21 are arranged in parallel at intervals, the cross section of each linear channel 21 is in a semi-arc shape, the arc radius of each linear channel 21 is slightly larger than that of a battery steel shell 10, and a magnet 3 for adsorbing the battery steel shell 10 in each linear channel is embedded in the side wall of each linear channel 21; an ejector rod channel 12 which penetrates through the upper surface and the lower surface of the base 1 and is communicated with the linear channel 21 is arranged on the base 1 below each linear channel 21, the longitudinal section of each ejector rod channel 12 is in a convex shape, an ejector rod 4 which is used for bearing a soft package battery core 101 in a battery steel shell 10 is nested in the ejector rod channel 12 in a sliding mode, the longitudinal section of each ejector rod 4 is in a convex shape, a groove 41 is formed in the center of the bottom of each ejector rod 4, a bottom plate 5 which is used for plugging the bottom of each ejector rod channel 12 is fixedly arranged at the bottom of the base 1, a spring 6 is arranged between the bottom plate 5 and the bottom of each ejector rod 4, one end of each spring 6 is fixedly connected with the inner side face of the corresponding bottom plate 5, the other end of each spring 4 is embedded in the groove 41 of the corresponding ejector rod 4, the head end 42 of each ejector rod 4 extends out of the upper opening end 121 of the corresponding ejector rod channel 12, and the area of the head end 42 of each ejector rod 4 is slightly smaller than the area of the opening end 102 of the battery steel shell 10, a positioning pin groove 43 is vertically formed in the surface of one side, away from the side plate, of the ejector rod 4, a positioning pin 7 horizontally penetrates through the base 1 and is in sliding connection with the positioning pin groove 43, and the stroke of the ejector rod 4 sliding up and down in the ejector rod channel 12 is limited to ensure that the bottom 104 of the battery steel shell 10 always exceeds the upper surface 21 of the side plate 2.

Before the welding operation, the bottom 104 of the battery steel shell 10 is buckled in the head end 42 of the ejector rod 4 in an upward reverse mode, the soft package battery core 101 in the battery steel shell 10 is attached to the head end 42 of the ejector rod 4, the area of the head end 42 of the ejector rod 4 is slightly smaller than that of the opening end 102 of the battery steel shell, so that the battery tab 103 extending out of the opening end 102 of the battery steel shell naturally drops, the side wall of the battery steel shell 10 is adsorbed in the linear channel 21 through the magnet 3, then, a laser welding machine (not shown) is started, the bottom of the battery steel shell 10 is pressed from the upper side by the head of the laser welding machine, the reverse acting force of the spring enables the ejector rod to push up the soft package battery core, and therefore the inner wall of the bottom 104 of the battery steel shell is in close contact with the tab gasket at the position, and then the welding operation is carried out.

The number of the side plates and the linear channels of the utility model is set according to the requirement, and the more the number is, the higher the welding efficiency is; as can be understood by those skilled in the art, in order to ensure that the battery steel shells on the positioning device are welded one by one, the interval between the adjacent side plates and the interval between the adjacent linear channels cannot interfere with the welding operation; in the embodiment, the side plate and the base are integrally formed, and the side plate can be additionally processed and fixed on the base in actual production; the center of the bottom of the ejector rod can be free of a groove, and one end of the spring is embedded in the groove and has higher stability than the spring directly contacting with the end face of the bottom; the magnet can be selectively installed in the linear channel, the battery steel shell is adsorbed in the linear channel by the installation of the magnet, the stability of welding operation can be improved, the requirement on the arc length of the cross section of the linear channel can be reduced, and when the cross section of the linear channel is in a semi-arc shape, the battery steel shell is easy to process, disassemble and assemble and weld, so that a better guiding effect is realized on the steel shell; the locating pin is installed as required, adds the locating pin and can lead to the stroke of ejector pin, if the ejector pin is shorter, can leave the clearance of stepping down for the battery steel casing between the head end of ejector pin and the upper end of ejector pin channel.

The above only be the embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all utilize the equivalent flow transform that the content of the specification was made, or direct or indirect application is in other relevant technical field, all including on the same reason the utility model discloses a patent protection within range.

Claims

1. The utility model provides a positioner for welding operation in lithium cell bottom which characterized in that: the battery steel shell sliding device comprises a base, wherein at least one side plate is vertically arranged on the upper surface of the base, at least one linear channel is arranged on the side surface of each side plate along the vertical direction, adjacent linear channels are arranged in parallel at intervals, the cross section of each linear channel is arc-shaped, the arc radius of each linear channel is slightly larger than the radius of a battery steel shell, and the arc length of the cross section of each linear channel is limited by the linear channel which is not easy to fall off when the battery steel shell slides on the linear channel; the base below each linear channel is provided with an ejector rod channel which penetrates through the upper surface and the lower surface of the base and is communicated with the linear channel, the longitudinal section of each ejector rod channel is in a convex shape, an ejector rod used for bearing a soft package battery core in a battery steel shell is nested in the ejector rod channel in a sliding manner, the longitudinal section of each ejector rod is in a convex shape, the bottom of the base is fixedly provided with a bottom plate used for plugging the bottom of the ejector rod channel, a spring is arranged between the bottom plate and the bottom of the ejector rod, one end of the spring is fixedly connected with the inner side surface of the bottom plate, the other end of the spring is contacted with the bottom of the ejector rod, the head end of each ejector rod extends out of the upper opening end of the ejector rod channel, and the area of the head end of each ejector rod is slightly smaller than that of the opening end of the battery steel shell; the bottom of battery steel casing back-off up in the head end of ejector pin before the welding operation, the contact of the head end of laminate polymer core and ejector pin, the top rod is limited in the upper surface that the bottom of ejector pin gliding stroke exceeds the curb plate all the time in the ejector pin channel from top to bottom.

2. The positioning device for the bottom welding operation of the lithium battery as claimed in claim 1, wherein: the bottom center of the ejector rod is provided with a groove, and the contact end of the spring and the ejector rod is embedded in the groove.

3. The positioning device for the bottom welding operation of the lithium battery as claimed in claim 1, wherein: and a positioning pin groove is vertically formed in the surface of one side of the ejector rod, which is far away from the side plate, and a positioning pin horizontally penetrates through the base and is in sliding connection with the positioning pin groove.

4. The positioning device for the bottom welding operation of the lithium battery as claimed in claim 1, wherein: and a magnet for attracting the battery steel shell into the linear channel is embedded in the side wall of the linear channel.

5. The positioning device for the bottom welding operation of the lithium battery as claimed in claim 4, wherein: the cross section of the linear channel is in a semi-circular arc shape.