Lithium battery tab welding device

Abstract

A lithium battery tab welding device relates to the technical field of welding auxiliary devices and comprises a working platform, a feeding belt is horizontally and rotatably mounted on the working platform, a plurality of positioning cylinders are arranged on the surface of the feeding belt in a surrounding manner in the feeding direction, and brackets are vertically arranged in the positioning cylinders in a lifting manner; the area, located between the upper belt and the lower belt, of the feeding belt is fixedly connected with a discharging cylinder driving the bracket to ascend and descend in the vertical direction. The utility model solves the problems that in the welding process of the cap and the tab of the cylindrical lithium battery in the prior art, as a gap is formed between the cap and the tab, the stable contact between the cap and the tab cannot be ensured in the welding process, the phenomenon of pseudo soldering is easily caused, and the use stability of the lithium battery is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of welding auxiliary devices, in particular to a lithium battery tab welding device. Background Art

[0002] Lithium batteries are currently widely used in devices such as smartphones, wearable devices, electric bicycles, and new energy vehicles due to their high energy density, high power density, and long cycle life. They are becoming a key to solving global challenges such as the energy crisis and environmental pollution. As electric vehicle technology continues to improve, electric and hybrid vehicles are becoming increasingly commonplace in people's daily lives, placing increasing demands on battery capacity and performance. Existing lithium batteries often utilize a multi-tab structure, with tabs welded using methods such as ultrasonic welding and resistance welding. Tab welding is a critical process in lithium batteries. If defects such as tab detachment or poor soldering occur, the battery's internal resistance and heat generation will increase significantly.

[0003] It is known that cylindrical lithium batteries are a common type of battery in life. When cylindrical lithium batteries are produced, the tabs of the internal battery cells need to be welded to the caps so that discharge can be carried out through the caps.

[0004] At present, when the positive tab and cap of a lithium battery are welded in the prior art, the lithium batteries need to be manually removed one by one after welding, which increases the workload, is time-consuming and labor-intensive, and thus reduces the speed of lithium battery welding.

[0005] A patent with publication number CN218556055U is disclosed in the prior art. The solution includes a cabinet, a lifting assembly, an extrusion mechanism, and a work box; the work box is installed in the cabinet, and at least one limiting hole is provided on the top of the work box. The lithium battery is placed in the limiting hole. A movable part is provided in the work box, and the movable part is located below the limiting hole for supporting the lithium battery; the lifting assembly is installed in the work box, and the lifting assembly drives the movable part to move up and down; the extrusion mechanism is installed in the cabinet, and the extrusion mechanism is located above the limiting hole. The extrusion mechanism is used to vertically position the lithium battery placed in the limiting hole, so that the lithium batteries do not need to be manually removed one by one after welding, which reduces the workload of workers and improves the speed of lithium battery welding.

[0006] As the existing devices are used, the shortcomings of this technology are gradually exposed, mainly in the following aspects:

[0007] First, during the welding process of the cap and the tab of the existing cylindrical lithium battery, due to the gap between the cap and the tab, the stable contact between the two cannot be guaranteed during the welding process, which easily leads to the phenomenon of cold welding and affects the stability of the lithium battery.

[0008] Second, after the cap and tab of the existing cylindrical lithium battery are welded, the operator needs to remove the welded cylindrical lithium battery and re-install the cylindrical lithium battery to be welded after each set of welding is completed, which reduces the welding efficiency of the lithium battery tab.

[0009] As can be seen from the above, the existing technology obviously has inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0010] In response to the defects in the existing technology, the utility model provides a lithium battery tab welding device to solve the problem that during the welding process of the cap and the tab of a cylindrical lithium battery in traditional technology, there is a gap between the cap and the tab, which makes it impossible to ensure stable contact between the two during the welding process, easily leading to the phenomenon of cold welding and affecting the stability of the lithium battery.

[0011] In order to achieve the above-mentioned purpose, the present utility model provides the following technical solutions.

[0012] The lithium battery tab welding device includes a working platform, on which a feed belt is horizontally mounted and rotated. The surface of the feed belt is surrounded by a plurality of positioning cylinders along the feeding direction. A bracket is vertically raised and lowered in the positioning cylinder.

[0013] The area between the upper and lower belts of the feed belt is vertically fixed with a discharge cylinder that drives the bracket to rise and fall.

[0014] A mounting seat is provided above the working platform and is lifted vertically. A welding gun body is fixedly connected to the mounting seat. A pressing cylinder covering the welding gun body is provided on the lower surface of the mounting seat and is lifted vertically.

[0015] As an optimized solution, a discharge notch is provided on the upper end of the positioning cylinder facing the feed belt side.

[0016] As an optimized solution, an upper surface of the bracket is provided with an inclined unloading surface, and the lower end of the inclined unloading surface is close to the unloading gap.

[0017] As an optimized solution, the feed belt is provided with an avoidance hole connected to the inner cavity of each positioning cylinder, the diameter of the avoidance hole is smaller than the diameter of the bracket, and the telescopic end of the unloading cylinder passes through the avoidance hole and abuts against the lower surface of the bracket.

[0018] As an optimized solution, both ends of the feed belt are rotatably supported by guide rollers, and the two guide rollers are rotatably mounted on the side plates toward the same end portions.

[0019] As an optimized solution, a mounting plate is fixedly connected between the two side plates, and the bottom of the unloading cylinder is fixedly connected to the mounting plate.

[0020] As an optimized solution, a position sensor is further fixed to the mounting plate, and the distance between the position sensor and the unloading cylinder is the same as the distance between the adjacent positioning cylinders.

[0021] As an optimized solution, a guide cylinder is fixed to the lower surface of the mounting seat, and the pressing cylinder is slidably installed in the guide cylinder.

[0022] As an optimized solution, rectangular constraint grooves are vertically provided on the relative inner walls of the guide cylinder, and constraint blocks constrained in the rectangular constraint grooves are fixedly connected to the relative outer walls of the pressing cylinder.

[0023] As an optimized solution, a compression spring is mounted on the outer wall of the pressing cylinder, and a retaining ring is fixed to the outer wall of the pressing cylinder. The two ends of the compression spring respectively resist the retaining ring and the lower end of the guide cylinder.

[0024] As an optimized solution, rectangular guide grooves are vertically provided on the relative inner walls of the positioning cylinder, and guide blocks constrained in the rectangular guide grooves are fixedly connected to the relative outer walls of the bracket.

[0025] As an optimized solution, the working platform is fixed with a side frame in the area on one side of the feed belt, the top of the side frame is fixed with a vertically arranged lifting cylinder, the telescopic end of the lifting cylinder is downwardly arranged and fixed with a connecting frame, and the connecting frame is fixed to the upper surface of the mounting seat.

[0026] As an optimized solution, the side panels are fixed to the work platform via support rods.

[0027] As an optimized solution, a guide plate is fixedly connected to the side plate near the discharge gap by tilting the frame.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] By arranging a plurality of positioning cylinders on the feed belt, a plurality of cylindrical lithium batteries can be inserted into the positioning cylinders in sequence. With the intermittent feeding of the feed belt, the positioning cylinders are moved to the bottom of the welding gun body in sequence, and the lifting cylinder drives the welding gun body to move downward. Since a pressing cylinder that slides vertically is provided on the periphery of the welding head of the welding body, the lower end of the pressing cylinder will abut against the cap at the upper end of the cylindrical lithium battery, pressing the cap downward to narrow the gap between the cap and the tab. As the lifting cylinder continues to move downward, the welding head of the welding body extends out of the pressing cylinder to realize welding of the cap and the tab, thereby ensuring the stability of the welding between the cap and the tab and preventing the occurrence of cold welding.

[0030] After welding, the cylindrical lithium battery moves to the top of the discharge cylinder as the feed belt is intermittently fed. The position sensor is used to control the movement distance of the feed belt. When the cylindrical lithium battery moves to the top of the discharge cylinder, the telescopic cylinder of the discharge cylinder extends, passes through the avoidance hole and rests on the lower surface of the bracket, driving the bracket to rise. The rise of the bracket drives the cylindrical lithium battery to rise. When the bracket moves to the height of the discharge notch, under the action of the inclined discharge surface, the cylindrical lithium battery will fall out along the discharge notch toward the side of the feed belt, fall onto the guide plate, and be transferred to the next processing step for use. It is convenient and quick, and improves the welding speed between the cap and the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0032] Figure 1 It is a structural diagram of the utility model;

[0033] Figure 2 This is a structural diagram of the positioning cylinder of the utility model;

[0034] Figure 3 It is a structural schematic diagram of the pressing cylinder of the utility model.

[0035] In the figure: 1-working platform; 2-guide roller; 3-feed belt; 4-positioning cylinder; 5-support; 6-avoidance hole; 7-mounting plate; 8-unloading cylinder; 9-position sensor; 10-side plate; 11-support rod; 12-mounting seat; 13-welding gun body; 14-pressing cylinder; 15-lifting cylinder; 16-connecting frame; 17-unloading notch; 18-inclined unloading surface; 19-guide plate; 20-guide cylinder; 21-rectangular constraint groove; 22-constraint block; 23-compression spring; 24-resistance ring. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0037] like Figures 1 to 3 As shown, the lithium battery tab welding device includes a working platform 1, on which a feed belt 3 is horizontally mounted. The surface of the feed belt 3 is surrounded by a plurality of positioning cylinders 4 along the feeding direction. A bracket 5 is vertically raised and lowered inside the positioning cylinder 4.

[0038] The area between the upper and lower belts of the feed belt 3 is vertically fixed with a discharge cylinder 8 that drives the bracket 5 to rise and fall.

[0039] A mounting seat 12 is vertically raised above the work platform 1 , a welding gun body 13 is fixed to the mounting seat 12 , and a pressing cylinder 14 covering the welding gun body 13 is vertically raised on the lower surface of the mounting seat 12 .

[0040] The upper end of the positioning cylinder 4 facing the feeding belt 3 is provided with a discharge notch 17 .

[0041] An inclined discharge surface 18 is provided on the upper surface of the bracket 5 , and a lower end of the inclined discharge surface 18 is close to the discharge notch 17 .

[0042] The feed belt 3 is provided with an avoidance hole 6 corresponding to each positioning cylinder 4, which is connected to its inner cavity. The diameter of the avoidance hole 6 is smaller than the diameter of the bracket 5. The telescopic end of the unloading cylinder 8 passes through the avoidance hole 6 and abuts against the lower surface of the bracket 5.

[0043] Both ends of the feed belt 3 are rotatably supported by guide rollers 2 , and the two guide rollers 2 are rotatably mounted on the side plates 10 toward the same end portions.

[0044] A mounting plate 7 is fixedly connected between the two side plates 10 , and the bottom of the discharge cylinder 8 is fixedly connected to the mounting plate 7 .

[0045] A position sensor 9 is also fixed to the mounting plate 7 , and the distance between the position sensor 9 and the discharge cylinder 8 is the same as the distance between the adjacent positioning cylinders 4 .

[0046] A guide cylinder 20 is fixed to the lower surface of the mounting seat 12 , and the pressing cylinder 14 is slidably mounted in the guide cylinder 20 .

[0047] A rectangular restraining groove 21 is vertically formed on the opposite inner wall of the guide cylinder 20 , and a restraining block 22 is fixedly connected to the opposite outer wall of the pressing cylinder 14 and is restrained in the rectangular restraining groove 21 .

[0048] A compression spring 23 is sleeved on the outer wall of the pressing cylinder 14 , and a butt ring 24 is also fixed to the outer wall of the pressing cylinder 14 . The two ends of the compression spring 23 respectively butt against the butt ring 24 and the lower end of the guide cylinder 20 .

[0049] Rectangular guide grooves are vertically provided on the opposite inner walls of the positioning cylinder 4 , and guide blocks constrained in the rectangular guide grooves are fixedly connected to the opposite outer walls of the bracket 5 .

[0050] The working platform 1 is fixed with a side frame in the area on one side of the feed belt 3, and a vertically arranged lifting cylinder 15 is fixed to the top of the side frame. The telescopic end of the lifting cylinder 15 is downwardly arranged and fixed with a connecting frame 16, and the connecting frame 16 is fixed to the upper surface of the mounting seat 12.

[0051] The side panels 10 are fixed to the work platform 1 via support rods 11 .

[0052] A guide plate 19 is fixedly connected to the side plate 10 near the discharge notch 17 by tilting the frame.

[0053] The power source for driving the feed belt 3 of this device and the electrical connection method of the position sensor 9 are both common in daily life. Since they are not the innovation of this solution, they will not be described in detail here.

[0054] The working principle of this device is:

[0055] By arranging a plurality of positioning cylinders 4 on the feed belt 3, a plurality of cylindrical lithium batteries can be inserted into the positioning cylinders 4 in sequence. With the intermittent feeding of the feed belt 3, the positioning cylinders 4 are moved to the bottom of the welding gun body 13 in sequence, and the lifting cylinder 15 drives the welding gun body 13 to move downward. Since a pressing cylinder 14 that slides vertically is provided on the periphery of the welding head of the welding body, the lower end of the pressing cylinder 14 will abut against the cap at the upper end of the cylindrical lithium battery, pressing the cap downward to narrow the gap between the cap and the tab. As the lifting cylinder 15 continues to move downward, the welding head of the welding body extends from the pressing cylinder 14 to achieve welding of the cap and the tab, thereby ensuring the stability of the welding between the cap and the tab and preventing the occurrence of cold welding.

[0056] After welding, the cylindrical lithium battery moves to the top of the discharge cylinder 8 as the feed belt 3 is intermittently fed. The position sensor 9 is used to control the movement distance of the feed belt 3. When the cylindrical lithium battery moves to the top of the discharge cylinder 8, the telescopic cylinder of the discharge cylinder 8 extends, passes through the avoidance hole 6 and rests on the lower surface of the bracket 5, driving the bracket 5 to rise. The rise of the bracket 5 drives the cylindrical lithium battery to rise. When the bracket 5 moves to the height of the discharge notch 17, under the action of the inclined discharge surface 18, the cylindrical lithium battery will fall out along the discharge notch 17 toward the side of the feed belt 3, fall onto the guide plate 19, and be transferred to the next processing step for use. It is convenient and fast, and improves the welding speed between the cap and the tab.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. Lithium battery tab welding device, characterized by: The invention comprises a working platform (1), on which a feeding belt (3) is horizontally rotatably mounted, a surface of the feeding belt (3) is provided with a plurality of positioning cylinders (4) along the feeding direction, and a bracket (5) is provided in the positioning cylinder (4) to be lifted vertically. The area of ​​the feed belt (3) between the upper and lower belts is vertically fixed with a discharge cylinder (8) for driving the bracket (5) to rise and fall. A mounting seat (12) is provided above the working platform (1) and is lifted vertically. A welding gun body (13) is fixedly connected to the mounting seat (12). A pressing cylinder (14) covering the welding gun body (13) is provided on the lower surface of the mounting seat (12) and is lifted vertically.

2. The lithium battery tab welding device according to claim 1, characterized in that: The upper end of the positioning cylinder (4) facing the feeding belt (3) is provided with a discharge notch (17).

3. The lithium battery tab welding device according to claim 2, characterized in that: An inclined discharge surface (18) is provided on the upper surface of the bracket (5), and a lower end of the inclined discharge surface (18) is close to the discharge notch (17).

4. The lithium battery tab welding device according to claim 3, characterized in that: The feed belt (3) is provided with a avoidance hole (6) corresponding to each positioning cylinder (4) and connected to its inner cavity. The diameter of the avoidance hole (6) is smaller than the diameter of the bracket (5). The telescopic end of the discharge cylinder (8) passes through the avoidance hole (6) and abuts against the lower surface of the bracket (5).

5. The lithium battery tab welding device according to claim 4, characterized in that: Both ends of the feed belt (3) are rotatably supported by guide rollers (2), and the two guide rollers (2) are rotatably mounted on the side plates (10) toward the same end portions.

6. The lithium battery tab welding device according to claim 5, characterized in that: A mounting plate (7) is fixedly connected between the two side plates (10), and the bottom of the discharge cylinder (8) is fixedly connected to the mounting plate (7).

7. The lithium battery tab welding device according to claim 6, characterized in that: A position sensor (9) is also fixedly connected to the mounting plate (7), and the distance between the position sensor (9) and the discharge cylinder (8) is the same as the distance between the adjacent positioning cylinders (4).

8. The lithium battery tab welding device according to claim 7, characterized in that: A guide cylinder (20) is fixedly connected to the lower surface of the mounting seat (12), and the pressing cylinder (14) is slidably installed in the guide cylinder (20). A rectangular constraint groove (21) is vertically opened on the relative inner wall of the guide cylinder (20), and a constraint block (22) constrained in the rectangular constraint groove (21) is fixedly connected to the relative outer wall of the pressing cylinder (14).

9. The lithium battery tab welding device according to claim 8, characterized in that: A compression spring (23) is mounted on the outer wall of the pressing cylinder (14), and a retaining ring (24) is fixedly connected to the outer wall of the pressing cylinder (14). The two ends of the compression spring (23) respectively abut against the retaining ring (24) and the lower end of the guide cylinder (20).

10. The lithium battery tab welding device according to claim 9, characterized in that: The working platform (1) is fixedly connected to a side frame in an area on one side of the feed belt (3); a vertically arranged lifting cylinder (15) is fixedly connected to the top of the side frame; a telescopic end of the lifting cylinder (15) is downwardly arranged and fixedly connected to a connecting frame (16); and the connecting frame (16) is fixedly connected to the upper surface of the mounting seat (12).

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