A lithium battery series welding device

Abstract

The present invention discloses a lithium battery series welding device, belonging to the technical field of lithium battery welding. It includes a switching device which is used to drive the movement of the lithium battery. There are two feeding devices and a welding device arranged on the switching device. The feeding device is used to place the lithium battery on the switching device, and the welding device is used to perform series welding on the lithium battery. The feeding device set in the present invention is divided into two cavities, which are respectively filled with lithium batteries. The lithium batteries are stacked with opposite positive electrode directions. During feeding, the lithium batteries in the two cavities simultaneously fall onto the lower seat of the lithium battery, so that the positive and negative electrodes of every two adjacent lithium batteries are placed in the opposite direction, and the lithium battery is positioned by a limiting plate, which is convenient for welding. The switching device set in the present invention enables the welding device to feed the lithium battery to be welded onto another lower docking mechanism simultaneously when welding the lithium battery pack, realizing the feeding for the next welding while welding, and improving the processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery welding, and particularly relates to a lithium battery series welding device. Background Art

[0002] A lithium battery is a type of battery that uses lithium as the main chemical element. Due to its high energy density, long lifespan, and low self-discharge rate, it is widely used in various electronic devices and electric vehicles. Lithium battery series welding is to connect multiple lithium battery units together to increase the total voltage of the battery pack. Usually, the positive and negative electrodes of the battery are connected together by welding metal strips or using welding tabs. Correct welding and connection can improve the performance and safety of the battery pack. The welding of lithium batteries usually adopts the form of resistance welding, and the welding tabs usually adopt nickel sheets. In the prior art, for lithium battery series welding, after manually placing the lithium batteries in place, the lithium batteries and nickel sheets are welded manually or by an automatic welder. The switching of the positive and negative electrodes of the lithium batteries is time-consuming and laborious, and at the same time, the welding positioning accuracy is insufficient and the degree of automation is low. Summary of the Invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a lithium battery series welding device, including a switching device. The switching device includes a main frame. The switching device is used to drive the lithium battery to move. Two feeding devices and a welding device are arranged on the switching device. The feeding device includes a feeding frame, and the feeding frame is fixedly installed on the main frame. The feeding device is used to place the lithium battery on the switching device. The welding device includes an upright frame, and the upright frame is fixedly installed on the main frame. The welding device is used to perform series welding on the lithium battery.

[0004] Further, a bottom electric cylinder is fixedly installed on the main frame of the switching device, a slide rail is fixedly installed on the main frame, and two groups of limit plates are fixedly installed on the main frame.

[0005] Further, two lower docking mechanisms are arranged on the slide rail. The lower docking mechanism includes a sliding frame slidably installed on the slide rail. The sliding frame at the right end is fixedly installed on the top of the bottom electric cylinder. The two sliding frames are fixedly installed. A screw motor is fixedly installed on the sliding frame, a screw rod is rotatably installed on the sliding frame, a sliding rod is fixedly installed on the sliding frame, and a lithium battery lower seat is slidably installed on the sliding rod. The lithium battery lower seat forms a screw drive with the screw rod. A number of lithium batteries are placed on the lithium battery lower seat through the feeding device, and the positive electrodes of adjacent two lithium batteries face in opposite directions.

[0006] Whenever two lithium batteries with opposite positive electrode orientations fall from the feeding rack, that is, when a group of lithium batteries reach the lower lithium battery seat, the lead screw motor rotates to drive the lead screw to rotate, thereby driving the lower lithium battery seat to slide two positions along the slide bar, so that all the lithium batteries are placed in the lower lithium battery seat. The bottom electric cylinder expands and contracts to drive two sliding frames to slide along the slide rail. When the lithium batteries on one lower lithium battery seat are being connected in series by welding, the other lower lithium battery seat can be loaded, saving working time.

[0007] Further, the feeding device includes a feeding box fixedly installed on the feeding rack. A feeding motor is fixedly installed on the feeding box, and a motor wheel is fixedly installed on the motor shaft of the feeding motor.

[0008] Further, two dial wheel mechanisms are arranged on the feeding box. The dial wheel mechanism includes a material dividing wheel rotatably installed on the feeding box. A material dividing gear is fixedly installed on the material dividing wheel. A transfer gear is rotatably installed on the feeding box. The material dividing gear meshes with the transfer gear, and the two transfer gears mesh with each other. A lower transmission wheel is fixedly installed on the left material dividing wheel. A motor transmission belt is wound around the lower transmission wheel and the motor wheel. Grooves with the same shape as the lithium battery are arranged on the material dividing wheel. The rotation directions of the two material dividing wheels are opposite. The feeding box is divided into two spaces where lithium batteries are stacked respectively, and the positive and negative electrodes of the lithium batteries stacked on both sides face opposite directions.

[0009] The feeding motor rotates to drive the motor wheel to rotate, drives the lower transmission wheel to rotate through the motor transmission belt, thereby driving the material dividing wheel to rotate. The two material dividing wheels are synchronously rotated through the material dividing gear and the transfer gear, and the rotation directions of the two material dividing wheels are opposite. The left material dividing wheel rotates clockwise, and the right material dividing wheel rotates counterclockwise. The lithium batteries in the feeding box are sent out one by one through the grooves in the material dividing wheel. The two material dividing wheels simultaneously place two lithium batteries with opposite positive electrode orientations into the lower lithium battery seat located below the feeding rack, and the lithium batteries are positioned by the limiting plate.

[0010] Further, the welding device includes an electric cylinder frame fixedly installed on the vertical frame. A top electric cylinder is fixedly installed on the electric cylinder frame. A pressing frame is fixedly installed on the top of the top electric cylinder. An upper guide post is fixedly installed on the pressing frame and is slidably installed on the electric cylinder frame. A upper seat is fixedly installed on the pressing frame.

[0011] Further, two resistance mechanisms are arranged on the pressing frame. The resistance mechanism includes an inner pushing electric cylinder fixedly installed on the pressing frame. An inner pushing plate is fixedly installed on the top of the inner pushing electric cylinder. An inner pushing sliding column is fixedly installed on the inner pushing plate and is slidably installed on the pressing frame. A number of welding resistors are arranged on the inner pushing plate.

[0012] Furthermore, two lifting mechanisms are arranged on the main frame. Each lifting mechanism includes a base fixedly installed on the main frame, a bottom sliding column fixedly installed on the base, a pressing lower frame slidably installed on the bottom sliding column, a groove frame fixedly installed on the pressing lower frame, a connecting frame fixedly installed on the base, an outer eccentric turntable rotatably installed on the connecting frame, an inner eccentric wheel fixedly installed on the outer eccentric turntable, an eccentric column fixedly installed on the outer eccentric turntable, the eccentric column sliding in the long groove of the groove frame, and an eccentric rotating rod eccentrically rotatably installed on the inner eccentric wheel.

[0013] Furthermore, a nickel sheet mechanism is arranged on the base. The nickel sheet mechanism includes a fixed cylinder fixedly installed on the base, an inner sliding column slidably installed in the fixed cylinder, a rising frame fixedly installed on the inner sliding column, a nickel sheet frame fixedly installed on the rising frame, several nickel sheets placed in the nickel sheet frame, an upper sliding column fixedly installed on the rising frame, the upper sliding column being slidably installed with the fixed cylinder, and a sliding column spring arranged between the upper sliding column and the fixed cylinder.

[0014] When the lower seat of the lithium battery drives the lithium battery to reach below the upper seat, the electric cylinder frame extends to drive the pressing lower frame to descend, driving the upper seat to descend. After the pressing lower frame contacts the pressing lower frame, the pressing lower frame drives the pressing lower frame to descend along the bottom sliding column, thereby driving the groove frame to descend, thereby driving the outer eccentric turntable to rotate through the eccentric column, thereby driving the inner eccentric wheel to rotate, thereby driving the eccentric rotating rod to rotate, thereby driving the rising frame and the inner sliding column to rise along the fixed cylinder, and the sliding column spring is compressed, thereby driving the nickel sheet frame and the nickel sheets to rise. When the upper seat contacts the lithium battery, the nickel sheets reach beside the lithium battery. Subsequently, the inner pushing electric cylinder contracts to drive the inner pushing plate and the inner pushing sliding column to slide inwards, driving the welding resistor to contact the nickel sheets, and welding the nickel sheets to the positive electrode of the lithium battery and the negative electrode of the adjacent lithium battery through the welding resistor, realizing the series welding of the lithium batteries. After the welding is completed, the inner pushing electric cylinder extends, and then the electric cylinder frame contracts, and the sliding column spring rebounds, so that the pressing lower frame, the upper seat, the pressing lower frame, and the nickel sheet frame return to the initial positions. Manually remove the welded lithium batteries, and manually place the nickel sheets for the next use in the nickel sheet frame.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: (1) The feeding device provided in the present invention is divided into two cavities, which are respectively filled with lithium batteries, and the positive electrode directions of the lithium batteries are stacked in opposite directions. During feeding, the lithium batteries in the two cavities simultaneously fall onto the lower seat of the lithium battery, so that the positive and negative electrodes of every two adjacent lithium batteries are arranged in opposite directions, and the lithium batteries are positioned by the limiting plates, which is convenient for welding; (2) When the upper seat of the welding device provided in the present invention descends, it simultaneously drives the nickel sheet frame and the nickel sheets to rise, so that the nickel sheets are butted against the lithium batteries, and the nickel sheets are welded to the lithium batteries through the welding resistor, connecting the lithium batteries in series, with a high degree of automation; (3) The switching device provided in the present invention enables the welding device to feed the lithium batteries to be welded onto another lower docking mechanism while welding the lithium battery pack, realizing the feeding for the next welding while welding, and improving the processing efficiency. Brief Description of the Drawings

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention (in the welded state).

[0017] Figure 2 This is a schematic diagram of the overall structure of the present invention (in the state to be welded).

[0018] Figure 3 This is a schematic diagram of the switching device structure of the present invention Figure 1 .

[0019] Figure 4 This is a schematic diagram of the switching device structure of the present invention Figure 2 .

[0020] Figure 5 This is a schematic diagram of the feeding device structure of the present invention Figure 1 .

[0021] Figure 6 This is a schematic diagram of the feeding device structure of the present invention Figure 2 .

[0022] Figure 7 This is a schematic diagram of the feeding device structure of the present invention Figure 3 .

[0023] Figure 8 This is a schematic diagram of the welding device structure of the present invention Figure 1 .

[0024] Figure 9 This is a schematic diagram of the welding device structure of the present invention Figure 2 .

[0025] Figure 10 This is a schematic diagram of the lifting mechanism structure of the present invention.

[0026] Figure 11 This is a schematic diagram of the nickel sheet holder structure of the present invention.

[0027] Attached reference numerals: 101 - main frame; 102 - bottom electric cylinder; 103 - slide rail; 104 - limit plate; 105 - sliding frame; 106 - lead screw motor; 107 - lead screw; 108 - slide bar; 109 - lower seat of lithium battery; 110 - lithium battery; 201 - feeding frame; 202 - feeding box; 203 - feeding motor; 204 - motor wheel; 205 - motor drive belt; 206 - lower drive wheel; 207 - material distributing wheel; 208 - material distributing gear; 209 - transfer gear; 301 - vertical frame; 302 - electric cylinder frame; 303 - top electric cylinder; 304 - lower pressing frame; 305 - upper guide post; 306 - base; 307 - bottom slide post; 308 - lower pressing and lowering frame; 309 - inner pushing electric cylinder; 310 - inner pushing plate; 311 - inner pushing slide post; 312 - welding resistor; 313 - groove frame; 314 - outer eccentric turntable; 315 - eccentric column; 316 - connecting frame; 317 - inner eccentric wheel; 318 - eccentric rotating rod; 319 - rising frame; 320 - fixed cylinder; 321 - inner slide post; 322 - upper slide post; 323 - slide post spring; 324 - nickel plate holder; 325 - nickel plate; 326 - upper seat. Detailed implementation manners

[0028] The following further describes the detailed implementation manners of the present invention in conjunction with the accompanying drawings.

[0029] Example: Refer to Figures 1 - 11 , a lithium battery series welding device, including a switching device. The switching device includes a main frame 101. The switching device is used to drive the lithium battery to move. There are two feeding devices and a welding device arranged on the switching device. The feeding device includes a feeding frame 201, and the feeding frame 201 is fixedly installed on the main frame 101. The feeding device is used to place the lithium battery on the switching device. The welding device includes a vertical frame 301, and the vertical frame 301 is fixedly installed on the main frame 101. The welding device is used to perform series welding on the lithium battery.

[0030] As Figure 3 、 Figure 4 shown, the switching device includes a bottom electric cylinder 102 fixedly installed on the main frame 101, a slide rail 103 fixedly installed on the main frame 101, and two groups of limit plates 104 fixedly installed on the main frame 101.

[0031] As Figure 3 、 Figure 4As shown in the figure, two lower docking mechanisms are provided on the slide rail 103. The lower docking mechanism includes a sliding frame 105 slidably mounted on the slide rail 103. The sliding frame 105 at the right end is fixedly installed on the top of the bottom electric cylinder 102. The two sliding frames 105 are fixedly installed. A screw motor 106 is fixedly installed on the sliding frame 105. A screw rod 107 is rotatably installed on the sliding frame 105. A sliding rod 108 is fixedly installed on the sliding frame 105. A lower lithium battery seat 109 is slidably mounted on the sliding rod 108. The lower lithium battery seat 109 forms a screw drive with the screw rod 107. A number of lithium batteries 110 are placed on the lower lithium battery seat 109 through a feeding device. The positive electrodes of two adjacent lithium batteries 110 face in opposite directions.

[0032] Whenever two lithium batteries 110 with opposite positive electrode orientations, that is, a group of lithium batteries 110, fall from the feeding rack 201 onto the lower lithium battery seat 109, the screw motor 106 rotates to drive the screw rod 107 to rotate, thereby driving the lower lithium battery seat 109 to slide two positions along the sliding rod 108, so that all the lithium batteries 110 are placed in the lower lithium battery seat 109. The two sliding frames 105 are driven to slide along the slide rail 103 by the telescopic movement of the bottom electric cylinder 102. When the lithium batteries 110 on one lower lithium battery seat 109 are being connected in series by welding, the other lower lithium battery seat 109 can be loaded, saving working time.

[0033] As Figures 5 - 7 shown in the figure, the feeding device includes a feeding box 202 fixedly installed on the feeding rack 201. A feeding motor 203 is fixedly installed on the feeding box 202. A motor wheel 204 is fixedly installed on the motor shaft of the feeding motor 203.

[0034] As Figures 5 - 7 shown in the figure, two dial wheel mechanisms are provided on the feeding box 202. The dial wheel mechanism includes a material dividing wheel 207 rotatably installed on the feeding box 202. A material dividing gear 208 is fixedly installed on the material dividing wheel 207. A transfer gear 209 is rotatably installed on the feeding box 202. The material dividing gear 208 meshes with the transfer gear 209. The two transfer gears 209 mesh with each other. A lower transmission wheel 206 is fixedly installed on the left material dividing wheel 207. A motor drive belt 205 is wound around the lower transmission wheel 206 and the motor wheel 204. The material dividing wheel 207 is provided with grooves having the same shape as the lithium battery 110. The rotation directions of the two material dividing wheels 207 are opposite. The feeding box 202 is divided into two spaces, in which lithium batteries 110 are stacked respectively. The positive and negative electrodes of the lithium batteries 110 stacked on both sides face in opposite directions.

[0035] The feeding motor 203 rotates to drive the motor wheel 204 to rotate. The lower transmission wheel 206 is driven to rotate through the motor transmission belt 205, thereby driving the material distribution wheel 207 to rotate. The synchronous rotation of the two material distribution wheels 207 is achieved through the material distribution gear 208 and the transfer gear 209, and the rotation directions of the two material distribution wheels 207 are opposite. The left material distribution wheel 207 rotates clockwise, and the right material distribution wheel 207 rotates counterclockwise. The lithium batteries 110 in the feeding box 202 are sent out one by one through the grooves in the material distribution wheel 207. The two material distribution wheels 207 simultaneously place two lithium batteries 110 with opposite polarities into the lithium battery lower seat 109 located below the feeding rack 201, and the lithium batteries 110 are positioned by the limiting plate 104.

[0036] As Figures 8 - 11 shown, the welding device includes an electric cylinder frame 302 fixedly installed on the vertical frame 301. A top electric cylinder 303 is fixedly installed on the electric cylinder frame 302. A lower pressing frame 304 is fixedly installed on the top of the top electric cylinder 303. An upper guide post 305 is fixedly installed on the lower pressing frame 304. The upper guide post 305 is slidably installed on the electric cylinder frame 302. A upper seat 326 is fixedly installed on the lower pressing frame 304.

[0037] As Figures 8 - 11 shown, two resistance mechanisms are provided on the lower pressing frame 304. The resistance mechanism includes an inner pushing electric cylinder 309 fixedly installed on the lower pressing frame 304. An inner pushing plate 310 is fixedly installed on the top of the inner pushing electric cylinder 309. An inner pushing sliding column 311 is fixedly installed on the inner pushing plate 310. The inner pushing sliding column 311 is slidably installed on the lower pressing frame 304. A number of welding resistors 312 are provided on the inner pushing plate 310.

[0038] As Figures 8 - 11 shown, two lifting mechanisms are provided on the main frame 101. The lifting mechanism includes a base 306 fixedly installed on the main frame 101. A bottom sliding column 307 is fixedly installed on the base 306. A lower pressing frame 308 is slidably installed on the bottom sliding column 307. A groove frame 313 is fixedly installed on the lower pressing frame 308. A connecting frame 316 is fixedly installed on the base 306. An outer eccentric turntable 314 is rotatably installed on the connecting frame 316. An inner eccentric wheel 317 is fixedly installed on the outer eccentric turntable 314. An eccentric column 315 is fixedly installed on the outer eccentric turntable 314. The eccentric column 315 slides in the long groove of the groove frame 313. An eccentric rotating rod 318 is eccentrically rotatably installed on the inner eccentric wheel 317.

[0039] As Figures 8 - 11As shown, a nickel sheet mechanism is provided on the base 306. The nickel sheet mechanism includes a fixed cylinder 320 fixedly installed on the base 306. An inner sliding column 321 is slidably installed in the fixed cylinder 320. An ascending frame 319 is fixedly installed on the inner sliding column 321. A nickel sheet holder 324 is fixedly installed on the ascending frame 319. A number of nickel sheets 325 are placed in the nickel sheet holder 324. An upper sliding column 322 is fixedly installed on the ascending frame 319. The upper sliding column 322 is slidably installed with the fixed cylinder 320. A sliding column spring 323 is provided between the upper sliding column 322 and the fixed cylinder 320.

[0040] When the lower seat 109 of the lithium battery brings the lithium battery 110 to below the upper seat 326, the electric cylinder frame 302 extends to drive the lower pressing frame 304 to descend, driving the upper seat 326 to descend. After the lower pressing frame 304 contacts the lower pressing frame 308, the lower pressing frame 304 drives the lower pressing frame 308 to descend along the bottom sliding column 307, thereby driving the groove frame 313 to descend, thereby driving the outer eccentric turntable 314 to rotate through the eccentric column 315, thereby driving the inner eccentric wheel 317 to rotate, thereby driving the eccentric rotating rod 318 to rotate, thereby driving the ascending frame 319 and the inner sliding column 321 to ascend along the fixed cylinder 320. The sliding column spring 323 is compressed, thereby driving the nickel sheet holder 324 and the nickel sheets 325 to ascend. When the upper seat 326 contacts the lithium battery 110, the nickel sheets 325 reach beside the lithium battery 110. Subsequently, the inner push electric cylinder 309 contracts to drive the inner push plate 310 and the inner push sliding column 311 to slide inwards, driving the welding resistor 312 to contact the nickel sheet 325. The nickel sheet 325 is welded to the positive electrode of the lithium battery 110 and the negative electrode of the adjacent lithium battery 110 through the welding resistor 312, realizing the series welding of the lithium batteries 110. After the welding is completed, the inner push electric cylinder 309 extends, and then the electric cylinder frame 302 contracts. The sliding column spring 323 rebounds, causing the lower pressing frame 304, the upper seat 326, the lower pressing frame 308, and the nickel sheet holder 324 to return to their initial positions. Manually remove the welded lithium battery 110, and manually place the nickel sheets 325 for the next use in the nickel sheet holder 324.

[0041] The working principle of a lithium battery series welding device disclosed in the present invention is as follows: The feeding motor 203 rotates to drive the motor wheel 204 to rotate. Through the motor drive belt 205, the lower transmission wheel 206 is driven to rotate, thereby driving the material distribution wheel 207 to rotate. Through the material distribution gear 208 and the transfer gear 209, the two material distribution wheels 207 rotate synchronously, and the rotation directions of the two material distribution wheels 207 are opposite. The left material distribution wheel 207 rotates clockwise, and the right material distribution wheel 207 rotates counterclockwise. The lithium batteries 110 in the feeding box 202 are sent out one by one through the grooves in the material distribution wheels 207. The two material distribution wheels 207 simultaneously place two lithium batteries 110 with opposite positive polarities into the lithium battery lower seat 109 located below the feeding rack 201. Whenever two lithium batteries 110 with opposite positive polarities fall from the feeding rack 201, that is, after a group of lithium batteries 110 reach the lithium battery lower seat 109, the lead screw motor 106 rotates to drive the lead screw 107 to rotate, thereby driving the lithium battery lower seat 109 to slide two positions along the slide bar 108, so that all the lithium batteries 110 are placed in the lithium battery lower seat 109. The bottom electric cylinder 102 expands and contracts to drive the two sliding frames 105 to slide along the slide rail 103. When the lithium batteries 110 on one lithium battery lower seat 109 are being series welded, feeding can be carried out on the other lithium battery lower seat 109, saving working time. When the lithium battery lower seat 109 drives the lithium battery 110 to reach below the upper seat 326, the electric cylinder frame 302 extends to drive the lower pressing frame 304 to descend, driving the upper seat 326 to descend. After the lower pressing frame 304 contacts the lower pressing frame 308, the lower pressing frame 304 drives the lower pressing frame 308 to descend along the bottom sliding column 307, thereby driving the groove frame 313 to descend, and then driving the outer eccentric turntable 314 to rotate through the eccentric column 315, thereby driving the inner eccentric wheel 317 to rotate, thereby driving the eccentric rotating rod 318 to rotate, thereby driving the rising frame 319 and the inner sliding column 321 to rise along the fixed cylinder 320. The sliding column spring 323 is compressed, thereby driving the nickel sheet holder 324 and the nickel sheet 325 to rise. When the upper seat 326 contacts the lithium battery 110, the nickel sheet 325 reaches beside the lithium battery 110. Subsequently, the inner push electric cylinder 309 contracts to drive the inner push plate 310 and the inner push sliding column 311 to slide inward, driving the welding resistor 312 to contact the nickel sheet 325. The nickel sheet 325 is welded to the positive electrode of the lithium battery 110 and the negative electrode of the adjacent lithium battery 110 through the welding resistor 312 to achieve the series welding of the lithium batteries 110. After the welding is completed, the inner push electric cylinder 309 extends, and then the electric cylinder frame 302 contracts, and the sliding column spring 323 rebounds, causing the lower pressing frame 304, the upper seat 326, the lower pressing frame 308, and the nickel sheet holder 324 to return to their initial positions. The welded lithium batteries 110 are manually removed, and the nickel sheets 325 for the next use are manually placed in the nickel sheet holder 324.

[0042] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope of the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A lithium battery series welding device, including a switching device, characterized in that: The described switching device includes a main frame (101). The switching device is used to drive the lithium battery to move. Two feeding devices and a welding device are provided on the switching device. The feeding device includes a feeding frame (201), and the feeding frame (201) is fixedly installed on the main frame (101). The feeding device is used to place the lithium battery on the switching device. The welding device includes an upright frame (301), and the upright frame (301) is fixedly installed on the main frame (101). The welding device is used to perform series welding on the lithium battery; A bottom electric cylinder (102) is fixedly installed on the main frame (101) of the described switching device. A slide rail (103) is fixedly installed on the main frame (101). Two groups of limit plates (104) are fixedly installed on the main frame (101); Two lower docking mechanisms are provided on the slide rail (103). The lower docking mechanism includes a sliding frame (105) slidably installed on the slide rail (103). The sliding frame (105) at the right end is fixedly installed on the top of the bottom electric cylinder (102). The two sliding frames (105) are fixedly installed. A screw motor (106) is fixedly installed on the sliding frame (105). A screw rod (107) is rotatably installed on the sliding frame (105). A slide rod (108) is fixedly installed on the sliding frame (105). A lower seat (109) of the lithium battery is slidably installed on the slide rod (108). The lower seat (109) of the lithium battery forms a screw drive with the screw rod (107). A number of lithium batteries (110) are placed on the lower seat (109) of the lithium battery through the feeding device. The positive poles of two adjacent lithium batteries (110) face in opposite directions; The welding device includes an electric cylinder frame (302) fixedly installed on the upright frame (301). A top electric cylinder (303) is fixedly installed on the electric cylinder frame (302). A pressing frame (304) is fixedly installed on the top of the top electric cylinder (303). An upper guide post (305) is fixedly installed on the pressing frame (304). The upper guide post (305) is slidably installed with the electric cylinder frame (302). An upper seat (326) is fixedly installed on the pressing frame (304); Two resistance mechanisms are provided on the pressing frame (304). The resistance mechanism includes an inner pushing electric cylinder (309) fixedly installed on the pressing frame (304). An inner pushing plate (310) is fixedly installed on the top of the inner pushing electric cylinder (309). An inner pushing slide column (311) is fixedly installed on the inner pushing plate (310). The inner pushing slide column (311) is slidably installed with the pressing frame (304). A number of welding resistors (312) are provided on the inner pushing plate (310); There are two lifting mechanisms arranged on the main frame (101). The lifting mechanism includes a base (306) fixedly installed on the main frame (101). A bottom sliding column (307) is fixedly installed on the base (306). A pressing and lowering frame (308) is slidably installed on the bottom sliding column (307). A groove frame (313) is fixedly installed on the pressing and lowering frame (308). A connecting frame (316) is fixedly installed on the base (306). An outer eccentric turntable (314) is rotatably installed on the connecting frame (316). An inner eccentric wheel (317) is fixedly installed on the outer eccentric turntable (314). An eccentric column (315) is fixedly installed on the outer eccentric turntable (314). The eccentric column (315) slides in the long groove of the groove frame (313). An eccentric rotating rod (318) is eccentrically rotatably installed on the inner eccentric wheel (317). A nickel sheet mechanism is arranged on the base (306). The nickel sheet mechanism includes a fixed cylinder (320) fixedly installed on the base (306). An inner sliding column (321) is slidably installed in the fixed cylinder (320). A rising frame (319) is fixedly installed on the inner sliding column (321). A nickel sheet frame (324) is fixedly installed on the rising frame (319). A number of nickel sheets (325) are placed in the nickel sheet frame (324). An upper sliding column (322) is fixedly installed on the rising frame (319). The upper sliding column (322) is slidably installed with the fixed cylinder (320). A sliding column spring (323) is arranged between the upper sliding column (322) and the fixed cylinder (320).

2. The lithium battery series welding device according to claim 1, characterized in that: The feeding device includes a feeding box (202) fixedly installed on a feeding frame (201). A feeding motor (203) is fixedly installed on the feeding box (202). A motor wheel (204) is fixedly installed on the motor shaft of the feeding motor (203).

3. A lithium battery series welding device according to claim 2, characterized in that: There are two dial wheel mechanisms arranged on the feeding box (202). The dial wheel mechanism includes a material distributing wheel (207) rotatably installed on the feeding box (202). A material distributing gear (208) is fixedly installed on the material distributing wheel (207). An intermediate gear (209) is rotatably installed on the feeding box (202). The material distributing gear (208) meshes with the intermediate gear (209). The two intermediate gears (209) mesh with each other. A lower transmission wheel (206) is fixedly installed on the left material distributing wheel (207). A motor transmission belt (205) is wound outside the lower transmission wheel (206) and the motor wheel (204). A groove having the same shape as the lithium battery (110) is arranged on the material distributing wheel (207). The rotation directions of the two material distributing wheels (207) are opposite. The feeding box (202) is divided into two spaces where the lithium batteries (110) are stacked respectively. The positive and negative poles of the lithium batteries (110) stacked on both sides face in opposite directions.

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