CN216177836U

CN216177836U - Foil welding device

Info

Publication number: CN216177836U
Application number: CN202122641481.2U
Authority: CN
Inventors: 李乾坤; 赵凯; 汪常
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model provides a foil welding device, which comprises a rack, a welding head assembly and a welding bottom assembly, wherein the welding head assembly and the welding bottom assembly are arranged on the rack; the welding head assembly comprises a welding head part, an energy conversion unit and a power unit, wherein the welding head part is rotatably arranged on the rack, the energy conversion unit and the power unit are respectively arranged at two ends of the welding head part, the energy conversion unit is used for providing ultrasonic vibration energy required by welding for the welding head part, and the power unit is used for driving the welding head part to rotate; the bottom welding assembly comprises a welding bottom part which is rotatably arranged on the rack, the welding bottom part and the welding head part are arranged oppositely from top to bottom along the height direction of the rack, a gap for a workpiece to be welded to pass through is formed between the welding bottom part and the welding head part, and the distance between the welding bottom part and the welding head part is adjustable. According to the foil welding device, the distance between the welding bottom and the welding head is adjustable according to the thickness of a piece to be welded, and the risk of welding leakage or over-welding can be reduced.

Description

Foil welding device

Technical Field

The utility model relates to the technical field of lithium ion battery production equipment, in particular to a foil welding device.

Background

The lithium ion battery is a high-capacity long-life environment-friendly battery, has a plurality of advantages, is widely applied to the fields of energy storage, electric automobiles, portable electronic products and the like, has higher and higher requirements on the safety performance of the lithium ion battery along with the gradual expansion of the use market of the lithium battery, does not catch fire or explode in the process of a needling experiment, and is a safety criterion that the lithium ion battery must reach.

The most important reason for the internal failure and fire of the lithium ion battery is that the surfaces of the anode aluminum foil and the cathode aluminum foil are in contact with each other, so that the anode aluminum foil and the cathode aluminum foil are prevented from being in contact with each other, and the most direct and effective solution for avoiding the internal failure and fire of the lithium ion battery is provided.

At present, people begin to use novel aluminium foil to make lithium ion battery, and this novel aluminium foil has effectively avoided the contact of anodal aluminium foil with the negative pole aluminium foil owing to adopt polymer non-metallic material to do the intermediate layer to the inefficacy problem of starting a fire of battery has been avoided.

However, the interlayer of the novel aluminum foil is non-metal, which is difficult to weld, and the existing foil welding equipment is not enough in structural design, and during welding, the foil is tightly supported on the welding head to be welded by adopting the welding bottom, and the gap between the welding bottom and the welding head cannot be adjusted according to the thickness of the foil, so that the problems of welding leakage or over-welding and the like often occur in the welding process, the welding quality of the foil is affected, and particularly when the thin foil is welded, the lithium ion battery finally cannot meet the use requirement.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a foil welding device, which can adjust the distance between the welding bottom and the welding head.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a foil welding device comprises a rack, and a welding head assembly and a welding bottom assembly which are arranged on the rack; wherein the content of the first and second substances,

the welding head assembly comprises a welding head part, an energy conversion unit and a power unit, wherein the welding head part is rotatably arranged on the rack, the energy conversion unit and the power unit are respectively arranged at two ends of the welding head part, the energy conversion unit is used for providing ultrasonic vibration energy required by welding for the welding head part, and the power unit is used for driving the welding head part to rotate;

the bottom welding assembly comprises a bottom welding part which is rotatably arranged on the rack, the bottom welding part and the welding head part are arranged oppositely up and down along the height direction of the rack, a gap for a workpiece to be welded to pass through is formed between the bottom welding part and the welding head part, and the distance between the bottom welding part and the welding head part is adjustable.

Furthermore, the welding head part comprises a first rotating shaft and an annular welding head, the first rotating shaft is rotatably arranged on the rack, the annular welding head is arranged on the first rotating shaft, and the energy conversion unit and the power unit are respectively arranged at two ends of the first rotating shaft.

Furthermore, the welding bottom assembly comprises a driving unit arranged on the rack, and the driving end of the driving unit is in power connection with the welding bottom so as to drive the welding bottom to be close to or far away from the welding head.

Furthermore, a welding bottom support which slides along the height direction of the rack in a guiding mode is arranged on the rack, the welding bottom is rotatably arranged on the welding bottom support, and the driving unit is in transmission connection with the welding bottom support through a lead screw.

Furthermore, the welding bottom comprises a second rotating shaft rotatably arranged on the welding bottom bracket and an annular welding bottom arranged on the second rotating shaft; and the welding head and/or the welding bottom are/is provided with patterns.

Further, the driving unit adopts a servo motor.

Further, the foil welding device further comprises a cooling assembly; the cooling assembly comprises a cooling pipeline sleeved on the welding head part and a supply unit used for supplying cooling liquid, and the supply unit is communicated with the cooling pipeline.

Further, the cooling duct is formed on the frame; or a lining is arranged between the welding head part and the frame, and part of the cooling pipeline is formed in the lining.

Further, the foil welding device also comprises a cleaning assembly arranged on the rack; the cleaning assembly has a scraping portion in flexible abutment with the welding head portion and/or the welding foot portion. .

Furthermore, a slot is arranged on the rack, and the cleaning assembly is inserted into the slot.

Compared with the prior art, the utility model has the following advantages:

according to the foil welding device, the distance between the welding bottom and the welding head is adjustable according to the thickness of a piece to be welded, so that the gap between the welding bottom and the welding head can be adjusted, the risk of welding leakage or over-welding can be reduced, a better welding effect is achieved, and the welding quality is improved.

In addition, the cooling assembly is arranged in the foil welding device, so that the welding head can be cooled in the welding process, and the welding quality is prevented from being influenced by overhigh temperature of the welding head. The welding head cleaning device has the advantages that the cleaning assembly is arranged on the rack, so that the welding head can be cleaned in the welding process, the influence on the welding quality due to the fact that impurities exist on the surface of the welding head is prevented, and the efficiency of welding operation can be improved while the welding quality is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic view of an angular overall structure of a foil welding apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view of another angle of the foil welding apparatus according to the embodiment of the present invention;

FIG. 3 is a partial view of portion A of FIG. 2;

fig. 4 is a partial view of portion B of fig. 2.

Description of reference numerals:

1. a frame; 101. a base plate; 102. a mounting frame; 103. a guide groove; 104. a liquid inlet; 105. a liquid outlet;

2. welding the head part; 201. a first rotating shaft; 202. a welding head; 3. an energy conversion unit; 4. a power unit; 5. a drive unit;

6. welding the bottom; 601. a second rotating shaft; 602. welding a bottom;

7. welding a bottom bracket; 701. a guide block;

8. a lead screw; 801. a limiting plate;

9. a cleaning assembly; 901. a scraping section; 10. a bushing; 11. and (5) waiting for welding.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The utility model relates to a foil welding device, which comprises a frame 1, a welding head assembly and a welding bottom assembly, wherein the welding head assembly and the welding bottom assembly are arranged on the frame 1; the welding head assembly comprises a welding head part 2 which is rotatably arranged on the rack 1, and an energy conversion unit 3 and a power unit 4 which are respectively arranged at two ends of the welding head part 2, wherein the energy conversion unit 3 is used for providing ultrasonic vibration energy required by welding for the welding head part 2, and the power unit 4 is used for driving the welding head part 2 to rotate.

The bottom welding assembly comprises a welding bottom part 6 which is rotatably arranged on the rack 1, the welding bottom part 6 and the welding head part 2 are arranged oppositely up and down along the height direction of the rack 1, a gap for a workpiece to be welded 11 to pass is formed between the welding bottom part 6 and the welding head part 2, and the distance between the welding bottom part 6 and the welding head part 2 is adjustable.

It should be noted that the energy conversion unit 3 and the power unit 4 can be selected from conventional equipment products in the prior art, for example, the energy conversion unit 3 employs an ultrasonic transducer to provide the welding energy to the welding head 202, and the power unit 4 employs a servo motor to drive the welding head 2 to rotate.

In addition, the to-be-welded part 11 of the present embodiment generally refers to a plurality of stacked foils, and since the distance between the welding bottom portion 6 and the welding head portion 2 is adjustable, a better welding effect is achieved when a smaller number of foils are welded, so that problems such as welding leakage or over-welding are avoided. The structures of the foil welding device in this embodiment that are not mentioned can refer to the structural parts of the ultrasonic metal seam welding equipment product in the prior art, and are not described herein again.

Based on the above general description, in the present embodiment, as a preferred embodiment, as shown in fig. 1, the rack 1 of the present embodiment includes a bottom plate 101 at the bottom, and a mounting frame 102 disposed on the bottom plate 101. The welding head part 2 of the present embodiment is rotatably disposed on the mounting frame 102, and an energy conversion unit 3 and a power unit 4 are disposed at two ends of the welding head part 2. Wherein, the energy conversion unit 3 is used for providing ultrasonic vibration energy required by welding to the welding head part 2, and the power unit 4 is used for driving the welding head part 2 to rotate.

In specific implementation, the welding head 2 includes a first rotating shaft 201 rotatably disposed on the mounting frame 102, and an annular welding head 202 disposed on the first rotating shaft 201, and the energy conversion unit 3 and the power unit 4 are respectively disposed at two ends of the first rotating shaft 201.

In the state shown in fig. 1, through holes are formed in both the left and right side plates of the mounting frame 102, the first rotating shaft 201 is inserted into the two through holes, the left end of the first rotating shaft 201 is connected with the energy conversion unit 3, and the right end of the first rotating shaft 201 is connected with the power unit 4. The rotation of the first shaft 201 on the mounting bracket 102 and the rotation of the second shaft 601 on the backing support 7, which will be described below, can be achieved by providing conventional bearing elements on the mounting bracket 102 or the backing support 7.

Of course, the first rotating shaft 201 may be directly disposed on the base plate 101 instead of being disposed on the mounting frame 102, and when disposed on the base plate 101, a mounting seat is required to support the first rotating shaft 201 or the entire welding head assembly, and the first rotating shaft 201 can be rotated on the mounting seat through a conventional bearing. In addition, the power unit 4 may be directly disposed on the mounting frame 102, or may be disposed on the bottom plate 101 through a support seat.

Preferably, the welding base part 6 of the present embodiment is also rotatably disposed on the mounting frame 102, the welding base part 6 and the welding head part 2 are arranged oppositely up and down along the height direction of the mounting frame 102, a gap for the to-be-welded part 11 to pass through is formed between the welding base part 6 and the welding head part 2, and the distance between the welding base part 6 and the welding head part 2 is adjustable.

In specific implementation, the bottom-welding assembly comprises a driving unit 5 arranged on the frame 1, and a driving end of the driving unit 5 is in power connection with the welding bottom part 6 so as to drive the welding bottom part 6 to be close to or far from the welding head part 2. In the state shown in fig. 1, the driving unit 5 is fixed on the top plate of the mounting frame 102, a through hole is opened on the top of the mounting frame 102, and the screw 8 passes through the through hole on the top of the mounting frame 102 and is in transmission connection with the driving unit 5.

Preferably, the driving unit 5 of the present embodiment employs a servo motor, and since the servo motor can realize closed-loop control of torque, position and speed, the control precision is high, and a stepping operation phenomenon similar to that of the step motor does not occur, the precise regulation and control of the distance between the welding bottom portion 6 and the welding head portion 2 can be realized, so as to facilitate achieving a better welding effect.

Also preferably, in the present embodiment, a welding bottom bracket 7 which is guided and slides along the height direction of the machine frame 1 is provided on the machine frame 1, the welding bottom 6 is rotatably provided on the welding bottom bracket 7, and the driving unit 5 is in transmission connection with the welding bottom bracket 7 through a lead screw 8. Specifically, a threaded hole matched with the lead screw 8 is formed in the top of the welding bottom bracket 7, the lead screw 8 penetrates through the threaded hole in the top of the welding bottom bracket 7 and is in transmission connection with the welding bottom bracket 7, as shown in fig. 1, in order to prevent the welding bottom bracket 7 from sliding off the lead screw 8, a circular limiting plate 801 is preferably further arranged at the bottom of the lead screw 8 to prevent the welding bottom bracket 7 from falling off the lead screw 8 in the process of moving the welding bottom bracket 7 up and down.

When the welding bottom bracket 7 is used, the welding bottom bracket 7 is in transmission connection with the servo motor through the lead screw 8, and when the servo motor is started, the welding bottom bracket 7 can correspondingly move upwards or downwards based on different rotation directions of the servo motor. At this time, referring to fig. 1 again, in order to realize the up-and-down guiding movement of the welding bottom bracket 7 driven by the servo motor, the guide blocks 701 are respectively arranged on the left and right side walls of the welding bottom bracket 7, and correspondingly, the guide grooves 103 are arranged on the two side surfaces of the mounting frame 102, so that the welding bottom bracket 7 can only move up and down along the height direction of the rack 1 by guiding and sliding the guide blocks 701 in the guide grooves 103, and the welding bottom bracket 7 can be prevented from rotating in the up-and-down moving process.

As a further improvement, the welding bottom part 6 includes a second rotating shaft 601 rotatably disposed on the welding bottom bracket 7, and an annular welding bottom 602 disposed on the second rotating shaft 601. In practice, the outer peripheral surfaces of the welding head 202 and the welding base 602 are preferably provided with patterns to prevent the problem of foil penetration during welding. The pattern is preferably a fine mesh or a spark-treated pattern.

Also as a preferred embodiment, the foil welding device of the present embodiment further comprises a cooling assembly. The cooling assembly includes a cooling pipe sleeved on the welding head part 2, and a supply unit for supplying cooling liquid, the supply unit being communicated with the cooling pipe.

In concrete implementation, as shown in fig. 1 and 2, a bushing 10 is provided between the horn unit 2 and the frame 1 in the present embodiment, and a portion of the cooling duct is formed in the bushing 10. Specifically, the bushings 10 are disposed between the first rotating shaft 201 and the mounting bracket 102, the two bushings 10 are respectively embedded on the left and right side plates of the mounting bracket 102, the two bushings 10 are hollow inside to form an internal channel, the front and rear end surfaces of each side plate are respectively provided with the liquid inlet 104 and the liquid outlet 105, the liquid inlet 104 and the liquid outlet 105 are respectively communicated with the internal channel in the bushings 10 to form a cooling pipeline of the present embodiment, so that the cooling liquid supplied by the supply unit flows through the cooling pipeline, and the cooling process of the welding head 2 is realized.

It should be noted that the supply unit in this embodiment is preferably a cooling liquid supply device commonly used in the art, such as a water storage tank and a liquid cooling device, and the supply unit is generally connected to the liquid inlet 104 and the liquid outlet 105 through a water pipe to provide the cooling liquid for circulation to the cooling pipeline.

Besides, the cooling duct of the present embodiment may be directly disposed on the mounting frame 102 of the rack 1, for example, a flow channel wound around the outer side of the first rotating shaft 201 is directly formed in the mounting frame 102, and the flow channel is communicated with the liquid inlet 104 and the liquid outlet 105 to form a cooling duct; or the cooling water pipe is directly sleeved on the first rotating shaft 201, and the normal operation of the welding head part 2 is not influenced by the cooling water pipe.

In this embodiment, the foil welding device further includes a cleaning assembly 9 disposed on the frame 1. Preferably, the cleaning assembly 9 has a scraping portion 901 in flexible abutment with the horn portion 2 and the sole portion 6. In the present embodiment, only fig. 1, fig. 2 and fig. 4 show an illustration that the cleaning assembly 9 has a scraping portion 901 flexibly abutting against the welding head portion 2, and a specific structure is as shown in fig. 4, a slot is provided on a floor of the rack 1, the cleaning assembly 9 is inserted into the slot, and the scraping portion 901 of the cleaning assembly 9 flexibly abuts against the welding head 202, so as to remove dust and impurities on the surface of the welding head 202, thereby facilitating the foil welding device to obtain a better welding effect.

In practical applications, the cleaning assembly 9 includes an insertion portion inserted into the insertion slot, and the scraping portion 901 is disposed on the insertion portion, but the cleaning assembly 9 may be directly formed by a conventional brush product. It should be noted that, because the temperature on the welding head 202 is low and does not exceed 100 ℃ at most during ultrasonic welding, the cleaning assembly 9 can remove impurities on the welding head 202 by using a conventional brush product.

When the foil welding device of the embodiment is used for welding the to-be-welded part 11, the driving unit 5 is started first, the welding base 602 is adjusted to a proper position, that is, the gap between the welding head 202 and the welding base 602 is adjusted to a required welding gap, and then the energy conversion unit 3 and the power unit 4 are started, the energy conversion unit 3 can generate ultrasonic vibration and drive the welding head 2 to vibrate, the power unit 4 drives the welding head 2 to rotate, when the to-be-welded part 11 passes through the gap between the welding head 202 and the welding base 602, the welding head 202 drives the welding base 602 to rotate through the to-be-welded part 11 (that is, the welding base 202 rotates from the welding head 202), at this time, the to-be-welded part 11 is welded through the combined action of the welding head 202 and the welding base 602, so that the welding operation process of the foil welding device is completed.

Meanwhile, during the welding operation, the cooling assembly can be started, and the cooling assembly cools the first rotating shaft 201 and the welding head 202 through the circulation of cooling liquid in the cooling pipeline. The cleaning assembly 9 cleans the surface of the welding head 202 by the scraping part 901 during the rotation of the welding head 202.

The foil welding device described in the embodiment can adjust the gap between the welding bottom part 6 and the welding head part 2 according to the thickness of the part to be welded 11 by setting the welding bottom part 6 to be adjustable relative to the distance between the welding head part 2, and further can reduce the risk of welding leakage or over-welding, thereby having better welding effect and improving the welding quality.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A foil welding device is characterized in that: the welding device comprises a rack (1), and a welding head assembly and a welding bottom assembly which are arranged on the rack (1); wherein the content of the first and second substances,

the welding head assembly comprises a welding head part (2) which is rotatably arranged on the rack (1), and an energy conversion unit (3) and a power unit (4) which are respectively arranged at two ends of the welding head part (2), wherein the energy conversion unit (3) is used for providing ultrasonic vibration energy required by welding for the welding head part (2), and the power unit (4) is used for driving the welding head part (2) to rotate;

the bottom welding assembly is arranged on the welding bottom portion (6) on the rack (1) in a rotating mode, the welding bottom portion (6) and the welding head portion (2) are arranged in a vertical opposite mode in the height direction of the rack (1), a gap for a to-be-welded part (11) to pass through is formed between the welding bottom portion (6) and the welding head portion (2), and the distance between the welding bottom portion (6) and the welding head portion (2) is adjustable.

2. Foil welding device according to claim 1, wherein: the welding head part (2) comprises a first rotating shaft (201) which is rotatably arranged on the rack (1) and an annular welding head (202) which is arranged on the first rotating shaft (201), and the energy conversion unit (3) and the power unit (4) are respectively arranged at two ends of the first rotating shaft (201).

3. Foil welding device according to claim 2, wherein: the welding bottom assembly comprises a driving unit (5) arranged on the rack (1), and the driving end of the driving unit (5) is in power connection with the welding bottom (6) so as to drive the welding bottom (6) to be close to or far away from the welding head (2).

4. Foil welding device according to claim 3, wherein: the welding machine is characterized in that a welding bottom support (7) which slides along the height direction of the rack (1) in a guiding mode is arranged on the rack (1), the welding bottom (6) is rotatably arranged on the welding bottom support (7), and the driving unit (5) is in transmission connection with the welding bottom support (7) through a lead screw (8).

5. Foil welding device according to claim 4, wherein: the welding bottom part (6) comprises a second rotating shaft (601) rotatably arranged on the welding bottom bracket (7) and an annular welding bottom (602) arranged on the second rotating shaft (601); and the welding head (202) and/or the welding bottom (602) is provided with patterns.

6. Foil welding device according to claim 3, wherein: the driving unit (5) adopts a servo motor.

7. Foil welding device according to claim 1, wherein: the foil welding device further comprises a cooling assembly; the cooling assembly comprises a cooling pipeline sleeved on the welding head part (2) and a supply unit for supplying cooling liquid, and the supply unit is communicated with the cooling pipeline.

8. Foil welding device according to claim 7, wherein: the cooling pipeline is formed on the frame (1); or a lining (10) is arranged between the welding head part (2) and the frame (1), and part of the cooling pipeline is formed in the lining (10).

9. Foil welding device according to any one of claims 1-8, wherein: the foil welding device also comprises a cleaning component (9) arranged on the rack (1); the cleaning assembly (9) has a scraping portion (901) in flexible abutment with the welding head portion (2) and/or the welding foot portion (6).

10. Foil welding device according to claim 9, wherein: the cleaning machine is characterized in that a slot is formed in the rack (1), and the cleaning component (9) is inserted into the slot.