Laser welding tab equipment

Abstract

The present invention provides a laser tab welding device, which relates to the field of lithium battery manufacturing technology. The laser tab welding device includes a body, an automatic unwinding device, an automatic rewinding device, a driving device, and a tab laser welding device. The automatic unwinding device is arranged on the body and is used to carry the unwinding pole sheet coil. The automatic rewinding device is arranged on the body and is used to carry the rewinding pole sheet coil. The driving device is arranged between the automatic unwinding device and the automatic rewinding device and is used to drive the pole sheet from the automatic unwinding device to the automatic rewinding device. The tab laser welding device is arranged on the body and is used to laser weld the pole sheet. Compared with the existing technology, the laser tab welding device provided by the present invention adopts non-contact welding through laser welding, does not require the replacement of the welding head like ultrasonic welding, and can effectively ensure indicators such as the cold welding rate, the residual rate after welding, and the tensile force, thereby solving the welding problems caused by ultrasonic welding.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a laser welding tab device. Background Art

[0002] In the process of welding the tabs and the pole sheet substrate of lithium-ion batteries, the pole sheet substrate is a very thin sheet (within 12μm). In the process of welding the tabs and the pole sheet substrate of lithium-ion batteries, the traditional welding method is ultrasonic welding. The high-voltage, high-frequency signal generated by the generator is converted into high-frequency mechanical vibration and processed on the tabs and the pole sheet foil. The friction between the pole sheet substrate, the tabs and the welding head causes the contact point temperature to rise. When the temperature reaches the melting point of the tabs and the pole sheet foil, the tabs and the pole sheet foil melt and both melt. However, there are several very difficult problems in welding the tabs and the pole sheet foil: the welding head has a limited life and needs to be replaced regularly, there is a serious problem of cold welding (due to the characteristics of ultrasonic welding, it may not be welded or it may become desoldered after welding for a long time), the burrs after welding are too large, the tension between the pole sheet foil and the tab is insufficient, the discharge current is insufficient during the formation discharge process, the resistance is too large, etc.

[0003] In view of this, it is particularly important to design and manufacture a laser welding tab equipment that uses non-contact welding, does not require replacement of the welding head like ultrasonic welding, and can effectively guarantee indicators such as the cold weld rate, post-weld residue rate, and tensile force. Summary of the Invention

[0004] The purpose of the present invention is to provide a laser welding tab device, which adopts non-contact welding and does not require replacement of the welding head like ultrasonic welding, and can effectively guarantee indicators such as the cold welding rate, the residual rate after welding, and the tensile force.

[0005] The present invention is achieved by adopting the following technical solutions.

[0006] A laser tab welding device includes a machine body, an automatic unwinding device, an automatic winding device, a driving device and a tab laser welding device. The automatic unwinding device is arranged on the machine body and is used to carry the unwound pole sheet coil. The automatic winding device is arranged on the machine body and is used to carry the wound pole sheet coil. The driving device is arranged between the automatic unwinding device and the automatic winding device and is used to drive the pole sheet to move from the automatic unwinding device to the automatic winding device. The tab laser welding device is arranged on the machine body and is used to laser weld the pole sheet.

[0007] Furthermore, the tab laser welding device includes a base, a welding fixture, a tab conveying assembly and a laser welding part. The base is arranged on the machine body and has a pole piece loading position. The tab conveying assembly is connected to the base and is used to convey the tab to the pole piece loading position. The welding fixture is arranged on the machine body and opposite to the base, and is used to press the tab on the pole piece loading position and make the tab and the pole piece fit together. The laser welding part is arranged on the welding fixture and is used to weld the tab and the pole piece that are fitted together.

[0008] Furthermore, the welding fixture includes a mounting frame, a pressing block and a driving member. The mounting frame is arranged on the machine body, the driving member is arranged on the mounting frame and is transmission-connected to the pressing block, the pressing block is arranged above the base and opposite to the pole piece loading position, and is used to be pressed on the pole piece loading position or detached from the pole piece loading position under the drive of the driving member.

[0009] Furthermore, an air blowing channel is provided in the pressing block, which extends downward to the bottom of the pressing block and is used to blow air toward the pole piece loading position so that the pole tab fits onto the pole piece.

[0010] Furthermore, the welding fixture also includes dust removal pipes arranged on both sides of the pressing block, and air outlet grooves are opened on both sides of the bottom of the pressing block. The air outlet grooves are connected to the blowing channel, and the dust removal pipes are connected to the air outlet grooves.

[0011] Furthermore, the blowing channel passes through the pressing block upwards, and a lens is provided on the top of the blowing channel. The lens is sealed and connected to the side wall of the blowing channel, and the laser welding part is provided above the lens.

[0012] Furthermore, the laser welding tab equipment also includes a tension control device, which is arranged on the machine body and located on the conveying path of the pole piece, and is used for floating tensioning the pole piece.

[0013] Furthermore, the laser welding tab equipment also includes a transverse powder brushing device, which is arranged on the machine body and located on the conveying path of the pole piece, and is used to brush powder on both sides of the pole piece.

[0014] Furthermore, the laser welding tab equipment also includes an air knife dust removal device, which is arranged on the machine body and located on the discharge side of the tab laser welding device, and is used to blow away the dust generated by welding on the pole piece.

[0015] Furthermore, the laser welding tab equipment also includes a gluing device, which is arranged on the machine body and located on the discharge side of the air knife dust removal device, and is used to glue the welded tabs.

[0016] The present invention has the following beneficial effects:

[0017] The present invention provides a laser tab welding device that unwinds and rewinds the electrode sheet by installing an automatic unwinding device and an automatic rewinding device on the body. Simultaneously, the electrode sheet is driven by a driving device and laser welded by the tab laser welding device. Compared to the existing technology, the laser tab welding device provided by the present invention uses non-contact laser welding, eliminating the need for replacing the welding head as in ultrasonic welding. It can effectively guarantee indicators such as the cold weld rate, the residual rate after welding, and the tensile force, thereby solving the welding problems caused by ultrasonic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the overall structure of a laser tab welding device provided in a first embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the middle tab laser welding device;

[0021] Figure 3 for Figure 2 Schematic diagram of the partial structure of the middle tab laser welding device;

[0022] Figure 4 for Figure 2 Schematic diagram of the structure of the welding fixture in the first perspective;

[0023] Figure 5 for Figure 2 Schematic diagram of the structure of the welding fixture in the second perspective;

[0024] Figure 6 for Figure 2 Schematic diagram of the structure of the middle base;

[0025] Figure 7 for Figure 1 One of the structural diagrams of the automatic unwinding device;

[0026] Figure 8 for Figure 1 The second structural diagram of the automatic unwinding device;

[0027] Figure 9 for Figure 1 Schematic diagram of the structure of the medium tension control device;

[0028] Figure 10 for Figure 1 Schematic diagram of the structure of the middle horizontal powder brushing device;

[0029] Figure 11 for Figure 1 Schematic diagram of the structure of the medium-speed knife dust removal device;

[0030] Figure 12 for Figure 1 Schematic diagram of the structure of the middle glue-applying device.

[0031] Icons: 100-Laser welding tab equipment; 110-Machine body; 111-Mounting plate; 120-Automatic unwinding device; 121-Unwinding air shaft; 123-Unwinding drive member; 125-Unwinding transmission shaft; 130-Automatic rewinding device; 140-Drive device; 150-Tap laser welding device; 151-Base; 1511-Vacuum adsorption plate; 153-Welding fixture; 1531-Mounting frame; 1533-Pressing block; 1534-Welding pressure plate; 1535-Drive member; 1536-lens; 1537-air blowing pipe; 1538-dust removal pipe; 1539-air outlet slot; 155-tab conveying assembly; 1551-conveyor rack; 1553-conveyor wheel; 1555-conveyor part; 157-laser welding part; 160-tension control device; 161-servo motor; 163-motor seat; 165-tension roller frame; 170-horizontal powder brushing device; 171-screen plate; 180-air knife dust removal device; 181-air knife air blowing block; 190-gluing device. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0038] First embodiment

[0039] See also Figure 1 A laser welding tab device 100 uses laser welding to weld the tabs, has good welding effect, adopts non-contact welding, does not need to replace the welding head like ultrasonic welding, and can effectively guarantee the false welding rate, residual rate after welding, tensile force and other indicators.

[0040] The laser tab welding apparatus 100 provided in this embodiment includes a body 110, an automatic unwinding device 120, an automatic rewinding device 130, a driving device 140, a tab laser welding device 150, a tension control device 160, a transverse powder brushing device 170, an air knife dust removal device 180, and a gluing device 190. The automatic unwinding device 120 is disposed on the body 110 and is used to carry the unwinding electrode sheet coil. The automatic rewinding device 130 is disposed on the body 110 and is used to carry the rewinding electrode sheet coil. The driving device 140 is disposed between the automatic unwinding device 120 and the automatic rewinding device 130 and is used to drive the electrode sheet from the automatic unwinding device 120 to the automatic rewinding device 130. The tab laser welding device 150 is disposed on the body 110 and is used to laser weld the electrode sheet. The tension control device 160 is disposed on the body 110 and is located on the electrode sheet conveying path to float and tension the electrode sheet. The horizontal powder brushing device 170 is installed on the machine body 110 and located on the electrode conveying path, and is used to brush powder on both sides of the electrode. The air knife dust removal device 180 is installed on the machine body 110 and located on the discharge side of the tab laser welding device 150, and is used to blow away the dust generated by welding on the electrode. The glue sticking device 190 is installed on the machine body 110 and located on the discharge side of the air knife dust removal device 180, and is used to glue the electrode after welding.

[0041] In this embodiment, a mounting plate 111 is provided on the machine body 110, and a plurality of components are mounted on the mounting plate 111. The pole pieces are transported on one side of the mounting plate 111, and power components or energy supply devices such as an air source are mounted on the other side. The installation positions of the automatic unwinding device 120, the automatic rewinding device 130, the driving device 140, the tab laser welding device 150, the tension control device 160, the transverse powder brushing device 170, the air knife dust removal device 180, and the gluing device 190 on the mounting plate 111 are not specifically limited. In addition, there are two tension control devices 160, which are respectively arranged on the discharge side of the automatic unwinding device 120 and the feed side of the automatic rewinding device 130, so as to control the tension of the unwinding and rewinding processes.

[0042] In this embodiment, the tab laser welding device 150 is arranged at the front end of the mounting plate 111, and at its rear end, an air knife dust removal device 180, a plurality of staggered gluing devices 190 and a driving device 140, and a horizontal powder brushing device 170 are sequentially arranged. Specifically, there are three gluing devices 190 and four driving devices 140. The three gluing devices 190 are arranged at intervals, and a driving device 140 is provided on the discharge side of each gluing device 190. At the same time, a driving device 140 is also provided at the discharge end of the air knife dust removal device 180. The electrode sheet is driven to be transported by multiple driving devices 140 to ensure the effect and stability of the transportation. Among them, multiple gluing devices 190 are respectively used to glue different parts. The specific gluing principle can be referred to the existing gluing device 190.

[0043] See also Figures 2 to 6 The tab laser welding device 150 includes a base 151, a welding fixture 153, a tab conveying assembly 155 and a laser welding part 157. The base 151 is set on the body 110 and has a pole piece loading position. The tab conveying assembly 155 is connected to the base 151 and is used to convey the tab to the pole piece loading position. The welding fixture 153 is set on the body 110 and is arranged opposite to the base 151. It is used to press on the pole piece loading position and make the tab and the pole piece fit together. The laser welding part 157 is set on the welding fixture 153 and is used to weld the tab and the pole piece that are fit together.

[0044] In this embodiment, the base 151 is detachably mounted on the front end of the mounting plate 111 by bolts and extends outward. The tab conveying assembly 155 is mounted on the outwardly extending end of the base 151 for conveying the tab to the pole piece loading position.

[0045] The tab conveying assembly 155 includes a conveying frame 1551, a conveying wheel 1553 and a conveying member 1555. The tab is rolled up on the conveying wheel 1553. The conveying member 1555 is installed on the conveying frame 1551 and is connected to the conveying wheel 1553 for transmission. The conveying frame 1551 is installed on the end extending outward from the base 151 and extends upward. A plurality of rollers are also provided on the conveying frame 1551 to facilitate the conveying of the tab from the conveying wheel 1553 to the pole piece loading position on the base 151.

[0046] Specifically, a vacuum adsorption plate 1511 is provided on the base 151. The vacuum adsorption plate 1511 has multiple vacuum adsorption holes, which can adsorb and fix the electrode piece to the base plate. Before welding, the position of the electrode piece and the electrode tab can be fixed, which facilitates the position of the electrode piece and the electrode tab to remain unchanged when the welding fixture 153 is pressed. At the same time, during the welding process, the vacuum adsorption plate 1511 still maintains the adsorption action to assist in fixing the electrode piece and the electrode tab.

[0047] The welding fixture 153 includes a mounting frame 1531, a pressing block 1533 and a driving member 1535. The mounting frame 1531 is set on the body 110, and the driving member 1535 is set on the mounting frame 1531 and is transmission-connected to the pressing block 1533. The pressing block 1533 is set above the base 151 and is opposite to the pole piece loading position, and is used to be pressed on the pole piece loading position or detached from the pole piece loading position under the drive of the driving member 1535.

[0048] In this embodiment, the mounting frame 1531 is fixed to the body 110 by bolts and is located above the base 151. The driving member 1535 is a cylinder that is used to push the pressing block 1533 up and down in the vertical direction, pressing the pressing block 1533 onto or off the pole piece loading position. Of course, the driving member 1535 here can also be other driving members 1535, such as a hydraulic cylinder or an electric push rod, and the like, which are not specifically limited here.

[0049] Specifically, a driving plate is fixedly provided on the mounting frame 1531, and a supporting plate is fixedly sleeved outside the pressing block 1533. The supporting plate is arranged parallel to the driving plate, and the supporting plate is connected to the output shaft of the driving member 1535. Driven by the driving member 1535, the supporting plate moves up and down relative to the driving plate.

[0050] The pressing block 1533 is provided with an air blowing channel extending downward to the bottom of the pressing block 1533 for blowing air into the electrode loading position to fit the electrode tab onto the electrode. Specifically, the pressing block 1533 is also provided with an air pipe extending into the pressing block 1533 and communicating with the air blowing channel for supplying air into the air blowing channel.

[0051] Furthermore, the welding fixture 153 also includes a dust removal duct 1538 arranged on both sides of the pressing block 1533, and an air outlet groove 1539 is opened on both sides of the bottom of the pressing block 1533. The air outlet groove 1539 is connected to the blowing channel, and the dust removal duct 1538 is connected to the air outlet groove 1539.

[0052] In this embodiment, the blowing pipe 1537 is arranged in the vertical direction and is a sealed structure. The air pipe is introduced from the middle and upper part of the blowing channel, and high-pressure gas is introduced into the blowing pipe 1537, and the high-pressure gas is blown downward through the blowing channel. The high-pressure gas flows into the dust removal pipe 1538 through the blowing grooves on both sides. On the one hand, it can form an airflow from top to bottom on the surface of the pole piece and the pole ear, so that the pole piece and the pole ear can fit together. On the other hand, the dust generated by welding can be blown into the dust removal pipe 1538 to achieve the effect of dust absorption. Of course, after welding is completed, other dust removal means can be used to further remove the dust on the pole piece. Please refer to the subsequent instructions for details.

[0053] It should be noted that internal air pressure is released from both sides of the pressing block 1533 to form a downward pressure, which ensures that the electrode foil and the tab are pressed together. The laser beam is emitted at the joint where the electrode foil and the tab meet. The energy during the welding process can cause deformation of the foil. The internal air pressure ensures that the foil and the tab are in contact, compensating for the deformation, arching, and gaps in the foil caused by the laser energy, ensuring that the tab and the electrode foil area are fully fitted, and improving the welding quality.

[0054] In this embodiment, the blowing channel passes through the pressing block upward, and a lens 1536 is provided at the top of the blowing channel. The lens 1536 is sealed to the side wall of the blowing channel, and the laser welding component 157 is provided above the lens 1536. Specifically, the laser welding component 157 includes a laser emitter, which emits laser light, which passes through the lens 1536 and directly hits the electrode loading position, thereby achieving welding of the electrode and the tab.

[0055] A welding plate 1534 is provided at the bottom of the compression block 1533. This plate is in driving connection with the drive mechanism and has welding holes formed therein, facing the air duct. Specifically, the compression block 1533 is rectangular in shape, and the welding plate 1534 is bolted to the bottom of the compression block 1533. The welding plate 1534 surrounds the bottom of the air outlet slot 1539 and assists in directing the high-pressure gas in the air duct into the dust removal duct 1538.

[0056] In this embodiment, a locating pin is provided on welding plate 1534, and a pin hole is provided at the bottom of pressing block 1533. The locating pin fits into the pin hole. Furthermore, a pin locking hole communicating with the pin hole is provided on the side wall of pressing block 1533. A locking pin is provided in the pin locking hole, which extends into the pin hole and abuts against the locating pin. The locating pin is used to align welding plate 1534 and pressing block 1533. The provision of the locking pin prevents the locating pin from being pulled out during disassembly, ensuring that pressing block 1533 and welding plate 1534 remain relatively fixed.

[0057] In this embodiment, a clearance opening is opened in the middle of the welding pressure plate 1534, which corresponds to the upper blowing channel. At the same time, the welding pressure plate 1534 is pressed on the pole piece and the pole ear. The clearance opening is the welding action position, so that the laser can pass through the blowing channel and act on the pole piece and the pole ear to complete the laser welding work.

[0058] See also Figure 7 and Figure 8 In this embodiment, the automatic unwinding device 120 includes an unwinding air shaft 121, an unwinding drive member 123 and an unwinding transmission shaft 125. The unwinding transmission shaft 125 is rotatably mounted on the mounting plate 111 of the machine body 110. The unwinding drive member 123 is in transmission connection with the unwinding transmission shaft 125 and is used to drive the unwinding transmission shaft 125 to rotate. The rear end of the unwinding transmission shaft 125 is connected to a transmission pulley. The unwinding air shaft 121 is arranged at the front end of the unwinding transmission shaft 125 and extends out of the mounting plate 111 for placing the unwinding electrode coil.

[0059] It should be noted that other structures of the automatic unwinding device 120, such as the correction mechanism, are consistent with the existing unwinding device. For details, please refer to the existing automatic unwinding device 120 and will not be described here one by one.

[0060] It should also be noted that the automatic winding device 130 includes a winding air shaft, a winding drive mechanism, and a winding transmission shaft. The winding transmission shaft is rotatably mounted on the mounting plate 111 of the body 110. The winding drive mechanism is connected to the winding transmission shaft for driving the winding transmission shaft to rotate. The rear end of the winding transmission shaft is connected to a transmission wheel. The winding air shaft is arranged at the front end of the winding transmission shaft and extends out of the mounting plate 111 for placing the unwound electrode coil. The structure of the automatic winding device 130 is consistent with that of the automatic unwinding device 120.

[0061] In this embodiment, the conveying direction of the electrode on the mounting plate 111 is from left to right, that is, the automatic unwinding device 120 is located on the left side of the mounting plate 111 , and the automatic winding device 130 is located on the right side of the mounting plate 111 .

[0062] See also Figure 9 The tension control device 160 is mounted on the machine body 110 and located on the electrode conveying path, and is used to float and tension the electrode. The tension control device 160 includes a servo motor 161, a motor base 163, and a tension roller frame 165. The motor base 163 is fixedly mounted on the mounting plate 111. The servo motor 161 is mounted on the motor base 163 and is in transmission connection with the tension roller frame 165. The rotation of the tension servo motor 161 pushes the tension roller frame 165, causing it to float left and right to tension the electrode. The magnitude of the tension is controlled by the closed loop between the tension motor and the drive motor, and the servo is used to control the unwinding motor's rotation time and speed.

[0063] It should be noted that the specific structure of the tension control device 160 can be found in the existing tension control mechanism and will not be described in detail here.

[0064] See also Figure 10 The horizontal powder brushing device 170 is provided on the machine body 110 and is located on the conveying path of the electrode, and is used to brush powder on both sides of the electrode. A mesh plate 171 with several through holes is provided at the bottom of the horizontal powder brushing device, and a dust suction device is provided under the mesh plate 171, so that the electrode can efficiently remove dust through the exhaust trough under high-speed operation. When in use, the electrode passes between the two powder brushing parts, and the motor rotates the brush to brush powder on both sides of the electrode. The dust suction port generates negative pressure in the trough. After the dust brushed off the electrode falls, the dust is sucked away by the exhaust trough from the several through holes of the mesh plate 171, thereby improving the dust suction rate. In addition, a cylinder is provided on one of the powder brushing parts to adjust the distance between the powder brushing parts.

[0065] It should be noted that the specific structure of the horizontal powder brushing device 170 can be found in the existing powder brushing device and will not be described in detail here.

[0066] See also Figure 11The air knife dust removal device 180 is installed on the machine body 110 and is located on the discharge side of the tab laser welding device 150. It is used to blow away the dust generated by welding on the electrode. The electrode roller welding position is equipped with an air knife blowing block 181 and a dust suction cavity. The blowing block is separated by 0.5mm-1mm to form a strong airflow. The angle is facing the welding position. The airflow blows away the dust at the welding position and is sucked away by the dust suction cavity on the opposite side. The area of the dust suction cavity opening must be much larger than the area of the blowing block.

[0067] It should be noted that the specific structure of the air knife dust removal device 180 can be found in the existing air knife dust removal device 180 and will not be described in detail here.

[0068] See also Figure 12 The gluing device 190 is installed on the body 110 and located on the discharge side of the air knife dust removal device 180. It is used to glue the electrode after welding. Specifically, each gluing module applies glue after the sensing of its own sensor. It can be glued to the upper and lower surfaces of the welded electrode tab to protect the welding area and prevent puncture of the diaphragm and other safety issues. Gluing can also be performed on the blank area of the electrode.

[0069] It should be noted that the specific structure of the gluing device 190 can be found in the existing gluing device 190 and will not be described in detail here.

[0070] In summary, the present embodiment provides a laser tab welding device 100, the working principle of which is as follows: the electrode is unwound by the automatic unwinding device 120, and after being stretched by the tension control device 160, it enters the tab laser welding device 150 for laser welding operation. Since laser welding adopts non-contact welding, and the electrode and the electrode can be clamped by the welding fixture 153, the welding quality is guaranteed. After the welding, the electrode is dust-removed by the air knife dust removal device 180 and then enters the multiple gluing devices 190 for gluing. The driving device 140 interspersed between the multiple gluing devices 190 drives the electrode to be transported forward, and finally passes through the horizontal powder brushing device 170 to brush the powder and then complete the winding action by the automatic winding device 130. Compared with the prior art, the laser tab welding device 100 provided in the present embodiment has high welding quality due to the use of laser welding. There is no need to replace the welding head like ultrasonic welding, and it can effectively guarantee indicators such as the cold welding rate, the residual rate after welding, and the tensile force. In addition, since the welding fixture 153 is used for clamping and pressing during laser welding, it ensures that the pole ear and the pole piece can remain in contact during the welding process, further improving the welding quality.

[0071] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A laser welding tab device, characterized in that: It includes a machine body, an automatic unwinding device, an automatic winding device, a driving device and a tab laser welding device, wherein the automatic unwinding device is arranged on the machine body and is used to carry the unwinding pole piece coil, the automatic winding device is arranged on the machine body and is used to carry the winding pole piece coil, the driving device is arranged between the automatic unwinding device and the automatic winding device and is used to drive the pole piece from the automatic unwinding device to the automatic winding device, and the tab laser welding device is arranged on the machine body and is used to perform laser welding on the pole piece; The tab laser welding device includes a base, a welding fixture, a tab conveying assembly and a laser welding piece. The base is arranged on the machine body and has a pole piece loading position. The tab conveying assembly is connected to the base and is used to convey the tab to the pole piece loading position. The welding fixture is arranged on the machine body and opposite to the base, and is used to press the tab on the pole piece loading position and make the tab and the pole piece fit together. The laser welding piece is arranged on the welding fixture and is used to weld the tab and the pole piece that are fit together. The tab conveying assembly includes a conveying frame, a conveying wheel and a conveying member, wherein the conveying wheel is arranged on the conveying frame and is wound with a tab, the conveying member is installed on the conveying frame and is in transmission connection with the conveying wheel, the conveying frame is installed at the end portion of the base extending outward and extending upward, and a plurality of rollers are further provided on the conveying frame for conveying the tab from the conveying wheel to the pole piece loading position on the base; The automatic unwinding device includes an unwinding air shaft, an unwinding drive member and an unwinding transmission shaft. The unwinding transmission shaft is rotatably mounted on the mounting plate of the machine body. The unwinding drive member is in transmission connection with the unwinding transmission shaft for driving the unwinding transmission shaft to rotate. The rear end of the unwinding transmission shaft is connected to a transmission wheel. The unwinding air shaft is arranged at the front end of the unwinding transmission shaft and extends out of the mounting plate for placing the unwinding electrode coil. The tab laser welding device is arranged at the front end of the mounting plate, and an air knife dust removal device, a plurality of staggered gluing devices, a driving device and a transverse powder brushing device are sequentially arranged at the rear end of the tab laser welding device. There are three gluing devices and four driving devices. The three gluing devices are arranged at intervals, and one driving device is provided on the discharge side of each gluing device, and another driving device is provided at the discharge end of the air knife dust removal device.

2. The laser welding tab equipment according to claim 1, characterized in that: The welding fixture includes a mounting frame, a pressing block and a driving member. The mounting frame is arranged on the machine body, the driving member is arranged on the mounting frame and is transmission-connected to the pressing block, the pressing block is arranged above the base and opposite to the pole piece loading position, and is used to be pressed on or detached from the pole piece loading position under the drive of the driving member.

3. The laser welding tab equipment according to claim 2, characterized in that: An air blowing channel is provided in the pressing block, and the air blowing channel extends downward to the bottom of the pressing block, and is used for blowing air toward the pole piece loading position so that the pole tab is attached to the pole piece.

4. The laser welding tab equipment according to claim 3, characterized in that: The welding fixture also includes dust removal pipes arranged on both sides of the pressing block, and air outlet grooves are opened on both sides of the bottom of the pressing block. The air outlet grooves are connected to the blowing channel, and the dust removal pipes are connected to the air outlet grooves.

5. The laser welding tab equipment according to claim 3, characterized in that: The air blowing channel passes through the pressing block upwards, and a lens is provided on the top of the air blowing channel. The lens is sealed and connected to the side wall of the air blowing channel, and the laser welding part is provided above the lens.

6. The laser welding tab equipment according to claim 1, characterized in that: The laser tab welding equipment further includes a tension control device, which is arranged on the machine body and located on the conveying path of the pole piece, and is used for floating tensioning the pole piece.

7. The laser welding tab equipment according to claim 1, characterized in that: The laser welding tab equipment further includes a transverse powder brushing device, which is arranged on the machine body and located on the conveying path of the pole piece, and is used to brush powder on both sides of the pole piece.

8. The laser welding tab equipment according to claim 1, characterized in that: The laser tab welding equipment further includes an air knife dust removal device, which is arranged on the machine body and located on the discharge side of the tab laser welding device, and is used to blow away the dust generated by welding on the pole piece.

9. The laser welding tab equipment according to claim 8, characterized in that: The laser welding tab equipment further includes a gluing device, which is arranged on the machine body and located on the discharge side of the air knife dust removal device, and is used to glue the electrode after welding.

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