Lithium battery welding equipment

Abstract

The invention discloses lithium battery welding equipment, and relates to the technical field of lithium battery processing equipment.The lithium battery welding equipment comprises a rack provided with a mounting cavity; the servo motor linear driving structure is mounted on the rack; the air cylinder linear driving structure is slidably arranged in the mounting cavity, and the servo motor linear driving structure is connected with the air cylinder linear driving structure and can drive the air cylinder linear driving structure to ascend and descend; the welding head assembly is installed on the air cylinder linear driving structure, and the air cylinder linear driving structure can drive the welding head assembly to ascend and descend; the moving distance of the welding head assembly driven by the servo motor linear driving structure is larger than that of the welding head assembly driven by the air cylinder linear driving structure, and the servo motor linear driving structure, the air cylinder linear driving structure and the welding head assembly are sequentially arranged from top to bottom. According to the technical scheme, the problem that existing lithium battery welding equipment is low in efficiency can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing equipment, and in particular to lithium battery welding equipment. Background Art

[0002] Lithium battery spot welding is a key step in the lithium battery manufacturing process, which involves connecting the metal parts inside or outside the battery (such as tabs, cover plates, shells, etc.) together through resistance welding. When spot welding lithium batteries, it is necessary to drive the welding head toward the welding position and apply a certain amount of pressure to the welding point.

[0003] When spot welding, the existing lithium battery welding equipment uses a single cylinder structure to drive the welding head to move, and applies a certain pressure to the welding point through the cylinder structure. However, due to the influence of the welding head stroke, the efficiency of the single cylinder structure to drive the welding head to move is relatively low. As the welding head stroke increases, the efficiency of the single cylinder structure to drive the welding head to move will be even lower. Summary of the invention

[0004] The main purpose of the present invention is to provide a lithium battery welding device, aiming to solve the problem of low efficiency of existing lithium battery welding devices.

[0005] To achieve the above purpose, the lithium battery welding equipment proposed by the present invention includes: A frame having a mounting cavity; A servo motor linear drive structure is installed on the frame; A cylinder linear drive structure is slidably disposed in the installation cavity, and the servo motor linear drive structure is connected to the cylinder linear drive structure and can drive the cylinder linear drive structure to rise and fall; and A welding head assembly is installed on the cylinder linear drive structure, and the cylinder linear drive structure can drive the welding head assembly to rise and fall; The moving distance of the welding head assembly driven by the servo motor linear drive structure is greater than the moving distance of the welding head assembly driven by the cylinder linear drive structure. The servo motor linear drive structure, the cylinder linear drive structure and the welding head assembly are arranged in sequence from top to bottom.

[0006] In one embodiment, the servo motor linear drive structure includes a servo motor, a screw, a screw seat, a transmission block, a first movable block and a guide rail, wherein the guide rail is fixed in the installation cavity, the first movable block is slidably arranged on the guide rail, the screw seat is fixed in the installation cavity, one end of the screw is installed on the screw seat, and the other end is connected to the transmission block, the transmission block is fixed to the first movable block, and the output end of the servo motor is drivingly connected to the screw; the cylinder linear drive structure is installed on the first movable block.

[0007] In one embodiment, the cylinder linear drive structure includes a cylinder part and a second movable block, the cylinder part is drivingly connected to the second movable block, the cylinder part is fixed to the first movable block, the second movable block is located below the first movable block and is slidably arranged on the guide rail, and the second movable block is used for installation of the welding head assembly.

[0008] In one embodiment, the lithium battery welding equipment further includes a self-weight compensation component, and the self-weight compensation component connects the first movable block and the second movable block.

[0009] In one embodiment, the self-weight compensation assembly includes a connecting rod and a buffer cavity, wherein the buffer cavity is disposed in the first movable block, one end of the connecting rod is connected to the second movable block, and the other end is disposed in the buffer cavity.

[0010] In one embodiment, the welding head assembly includes a welding head, an ultrasonic horn, a fixed seat, and a mounting seat. The mounting seat is fixed to the second movable block, the ultrasonic horn is fixed to the mounting seat, the fixed seat is fixed to the mounting seat by screw locking, and the welding head is connected to the ultrasonic horn via the fixed seat.

[0011] In one embodiment, the welding head is arranged horizontally.

[0012] In one embodiment, the welding head assembly further includes a proximity sensor, and the proximity sensor is mounted on the fixing seat above the welding head.

[0013] In one embodiment, the frame includes a movable base and a mounting frame, the mounting frame is fixed to the movable base, the mounting cavity is provided on the mounting frame, and the servo motor linear drive structure is installed on the mounting frame; The movable base has an unlocked state and a locked state. In the unlocked state, the mounting bracket can move along a first direction, and in the locked state, the mounting bracket can be positioned at a preset position.

[0014] In one embodiment, the movable base includes a fixed plate, a movable plate and a locking member, the mounting frame is fixed to the movable plate, and the movable plate is slidably connected to the fixed plate; The locking member has an unlocking state and a locking state. In the unlocking state, the movable plate can move relative to the fixed plate. In the locking state, the movable plate can be fixed relative to the fixed plate.

[0015] The technical solution of the present invention adopts a servo motor linear drive structure to drive the cylinder linear drive structure and the welding head assembly to rise and fall. At this time, the welding head assembly performs a first displacement, and the cylinder linear drive structure drives the welding head assembly to rise and fall. At this time, the welding head assembly performs a second displacement, and the first displacement distance is greater than the second displacement distance. Furthermore, since the servo motor linear drive structure has a better response speed than the cylinder linear drive structure, the welding head assembly can be quickly completed when performing the first displacement. That is to say, most of the displacements of the welding head assembly during the welding process can be achieved through the rapid response of the servo motor linear drive structure, which can effectively shorten the time of the welding head assembly moving, thereby improving the movement efficiency and solving the technical problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A structural schematic diagram of an embodiment of a lithium battery welding device provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the internal structure of the installation cavity of the lithium battery welding equipment; Figure 3 for Figure 2 Structural diagram of the servo motor linear drive structure and deadweight compensation component; Figure 4 for Figure 3 Exploded diagram of Figure 5 A schematic structural diagram of an embodiment of a first connecting block and a buffer chamber in the lithium battery welding equipment provided by the present invention; Figure 6 for Figure 2 A schematic diagram of the structure of the middle welding head assembly and the second movable block; Figure 7 This is a structural schematic diagram of an embodiment of a movable base in the lithium battery welding equipment provided by the present invention.

[0018] Description of Figure Numbers: 100, rack; 110, mounting cavity; 120, movable base; 121, fixed plate; 122, movable plate; 123, locking member; 130, mounting frame; 200, servo motor linear drive structure; 210, servo motor; 220, lead screw; 230, lead screw seat; 240, transmission block; 250, first movable block; 260, guide rail; 300, cylinder linear drive structure; 310, cylinder member; 320, second movable block; 400, welding head assembly; 410, welding head; 411, mounting portion; 412, welding portion; 420, ultrasonic horn; 430, mounting seat; 440, proximity sensor; 450, fixing seat; 500, self-weight compensation assembly; 510, connecting rod; 520, buffer chamber; 521, first chamber; 522, second chamber; 530, first connecting block; 540, second connecting block; 550, connecting plate; 560, limit slot.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Lithium battery spot welding is a key step in the lithium battery manufacturing process, which involves connecting the metal parts inside or outside the battery (such as tabs, cover plates, shells, etc.) together through resistance welding. When spot welding lithium batteries, it is necessary to drive the welding head toward the welding position and apply a certain amount of pressure to the welding point.

[0024] When spot welding, the existing lithium battery welding equipment uses a single cylinder structure to drive the welding head to move, and applies a certain pressure to the welding point through the cylinder structure. However, due to the influence of the welding head stroke, the efficiency of the single cylinder structure to drive the welding head to move is relatively low. As the welding head stroke increases, the efficiency of the single cylinder structure to drive the welding head to move will be even lower.

[0025] The invention provides a lithium battery welding device.

[0026] See also Figure 1 , Figure 2 In one embodiment of the present invention, the lithium battery welding equipment includes: a frame 100, a servo motor linear drive structure 200, a cylinder linear drive structure 300 and a welding head assembly 400, wherein the frame 100 is provided with an installation cavity 110; the servo motor linear drive structure 200 is installed on the frame 100; the cylinder linear drive structure 300 is slidably arranged in the installation cavity 110, further, the servo motor linear drive structure 200 is connected to the cylinder linear drive structure 300, the servo motor linear drive structure 200 can drive the cylinder linear drive structure 300 to rise and fall, the welding head assembly 400 is installed on the cylinder linear drive structure 300, the cylinder linear drive structure 300 can drive the welding head assembly 400 to rise and fall, and the servo motor linear drive structure 200 drives the welding head assembly 400 to move a greater distance than the cylinder linear drive structure 300 drives the welding head assembly 400 to move. It can be understood that during use, the servo motor linear drive structure 200 can drive the cylinder linear drive structure 300 and the welding head assembly 400 to rise and fall. At this time, the welding head assembly 400 performs the first displacement, and the cylinder linear drive structure 300 drives the welding head assembly 400 to rise and fall. At this time, the welding head assembly 400 performs the second displacement, and the first displacement distance is greater than the second displacement distance. Furthermore, since the servo motor linear drive structure 200 has a better response speed than the cylinder linear drive structure 300, the welding head assembly 400 can be completed quickly when performing the first displacement. In other words, most of the displacements of the welding head assembly 400 during the welding process can be achieved through the rapid response of the servo motor linear drive structure 200, which can effectively shorten the time of the welding head assembly 400 when moving, thereby improving the movement efficiency and solving the technical problems existing in the prior art. Furthermore, for a small part of the displacement, it can be achieved by the cylinder linear drive structure 300 driving the welding head assembly 400.

[0027] Further, the servo motor linear drive structure 200, the cylinder linear drive structure 300, and the welding head assembly 400 are arranged in sequence from top to bottom. Since the cylinder linear drive structure 300 drives the welding head assembly 400 to move the second displacement distance is small, the impact force generated when the cylinder linear drive structure 300 drives the welding head assembly 400 to move downward will also be reduced; in this way, it is possible to avoid the cylinder linear drive structure 300 driving the welding head assembly 400 to move downward for a long distance, avoid the welding head assembly 400 to generate a large impact force, and avoid the possibility of a large impact force acting on the lithium battery welding part. It should be noted that if the impact force on the lithium battery welding part is large, there is a situation where the lithium battery welding part is damaged. That is to say, this embodiment drives the welding head assembly 400 to move by the cooperation of the servo motor linear drive structure 200 and the cylinder linear drive structure 300. On the one hand, it can improve the efficiency of the welding head assembly 400 in the displacement process, thereby improving the working efficiency of the welding equipment, and on the other hand, it can avoid the welding head assembly 400 from being damaged due to excessive impact force, thereby ensuring the welding quality. Since the distance that the cylinder linear drive structure 300 drives the welding head assembly 400 to perform the second displacement is relatively small, the cylinder linear drive structure 300 does not require a large-flow gas supply system at this time, which can effectively reduce the cost of the cylinder linear drive structure 300 and the subsequent maintenance costs of the equipment. At the same time, it can also make the structure more compact compared to the cylinder linear drive structure 300 that requires a large-flow gas supply system.

[0028] In one embodiment, reference Figure 2 , Figure 3The servo motor linear drive structure 200 includes a servo motor 210, a screw rod 220, a screw rod seat 230, a transmission block 240, a first movable block 250 and a guide rail 260, wherein the guide rail 260 is fixedly arranged in the installation cavity 110, the first movable block 250 is slidably arranged in the guide rail 260, the screw rod seat 230 is fixedly arranged in the installation cavity 110, one end of the screw rod 220 is installed in the screw rod seat 230, and the other end is connected to the transmission block 240, the transmission block 240 is fixedly arranged in the first movable block 250, and the output end of the servo motor 210 is drivingly connected to the screw rod 220, wherein the servo motor 210 is fixedly arranged in the frame 100, the screw rod 220, the screw rod seat 230, the transmission block 240, the first movable block 250 and the guide rail 260 are all installed in the installation cavity 110, and the screw rod seat 230 is close to the servo motor 210. The servo motor 210 is arranged, and part of the structure of the screw rod 220 can be inserted into the first movable block 250. It can be understood that an avoidance cavity is opened in the first movable block 250, and the avoidance cavity is used to avoid the screw rod 220. Further, the transmission block 240 is installed on the outside of the screw rod 220, and the transmission block 240 is fixed to the first movable block 250 by screw locking. In this way, when the servo motor 210 drives the screw rod 220 to transmit, the screw rod 220 can drive the transmission block 240, and the transmission block 240 enables the first movable block 250 to move along the guide rail 260. Further, the extension direction of the guide rail 260 is the lifting direction of the welding head assembly 400. At this time, the first movable block 250 can drive the cylinder linear drive structure 300 and the welding head assembly 400 to rise and fall when moving, so that the welding head assembly 400 is displaced in the first section at a faster speed.

[0029] In one embodiment, reference Figure 2 , Figure 3The cylinder linear drive structure 300 includes a cylinder part 310 and a second movable block 320. The cylinder part 310 is connected to the second movable block 320 by driving. The cylinder part 310 is fixed to the first movable block 250. The second movable block 320 is located below the first movable block 250 and is slidably arranged on the guide rail 260. The second movable block 320 is used for installing the welding head assembly 400. The first movable block 250 and the second movable block 320 share a guide rail 260. In this way, the movement accuracy of the first movable block 250 and the second movable block 320 can be ensured, and the difficulty of assembly can be reduced. Further, in some embodiments, the guide rail 260 is configured as two, and the two guide rails 260 are respectively arranged on the opposite side walls of the installation cavity 110. The opposite sides of the first movable block 250 and the second movable block 320 are respectively connected to the two guide rails 260. In this way, the first movable block 250 and the second movable block 320 can be more stable when moving. Furthermore, the first movable block 250 can drive the cylinder part 310, the second movable block 320 and the welding head assembly 400 to move during the movement. When the first movable block 250 moves to a suitable position, the cylinder part 310 drives the second movable block 320 to move, and the second movable block 320 drives the welding head assembly 400 to a preset position, so that the welding head assembly 400 is against the welding point of the lithium battery.

[0030] In one embodiment, reference Figure 3 , Figure 4 , Figure 5 , the lithium battery welding equipment also includes a self-weight compensation component 500, and the self-weight compensation component 500 connects the first movable block 250 and the second movable block 320. Further, under the action of the self-weight compensation component 500, the servo motor 210 does not need to overcome the entire self-weight of the first movable block 250 and the second movable block 320 during the pneumatic and stopping process, which can reduce the required peak torque and the energy consumption during stopping; at the same time, it can also improve the response speed. Since the inertia that needs to be overcome is reduced, the servo motor 210 can respond to instructions faster and can drive the first movable block 250 and the second movable block 320 to change position more quickly, further improving efficiency, and reducing the workload of the servo motor 210, reducing the possibility of overload, helping to protect the motor and extend its service life. Furthermore, since the servo motor linear drive structure 200 adopts structures such as the screw rod 220, the self-weight compensation component 500 can also reduce the pressure on the screw rod 220, thereby reducing the friction and wear between the screw rod 220 and the transmission block 240, and extending the service life of the screw rod 220.

[0031] In one embodiment, reference Figure 4 , Figure 5The self-weight compensation assembly 500 includes a connecting rod 510 and a buffer chamber 520. The buffer chamber 520 is provided in the first movable block 250. One end of the connecting rod 510 is connected to the second movable block 320, and the other end is provided in the buffer chamber 520. Further, both ends of the connecting rod 510 are provided with connecting plates 550. In this way, the connecting plates 550 provided in the buffer chamber 520 can divide the buffer chamber 520 into a first chamber 521 and a second chamber 522, wherein the first chamber 521 and the second chamber 522 are arranged in layers. Further, in some embodiments, the first chamber 521 and the second chamber 522 are respectively provided with air passages, wherein the air passages are connected to the outside. It should be noted that a valve body structure is provided in the air passages. Specifically, in some embodiments, the self-weight compensation component 500 includes a first connecting block 530 and a second connecting block 540, the first connecting block 530 is fixed to the first movable block 250 by screw locking, and the second connecting block 540 is fixed to the second movable block 320 by screw locking, wherein the buffer cavity 520 is provided on the first connecting block 530, and a limiting slot 560 is provided on the second connecting block 540, and the end of the connecting rod 510 away from the buffer is provided in the limiting slot 560, wherein the connecting rod 510 is plugged into the limiting slot 560, and specifically, the limiting slot 560 is opened on the second connecting block 540 along the horizontal direction.

[0032] In one embodiment, reference Figure 6 The welding head assembly 400 includes a welding head 410, an ultrasonic horn 420, a fixing seat 450, and a mounting seat 430. The mounting seat 430 is fixed to the second movable block 320, the ultrasonic horn 420 is fixed to the mounting seat 430, the fixing seat 450 is fixed to the mounting seat 430 by screw locking, and the welding head 410 is connected to the ultrasonic horn 420 through the fixing seat 450. Further, the mounting seat 430 is fixed to the second movable block 320 by screw locking, the fixing seat 450 is fixed to the mounting seat 430 by screw locking, wherein the welding head 410 is connected to the ultrasonic horn 420, and the fixing seat can limit the welding head 410 to the ultrasonic horn 420, wherein the fixing seat 450 fixes the welding head 410 to the ultrasonic horn 420 by clamping, so that the welding head 410 can be easily replaced.

[0033] In one embodiment, reference Figure 2 , Figure 6The welding head 410 is horizontally arranged. Specifically, the structure of the welding head 410 is arranged outside the frame 100. Such an arrangement can facilitate the application of lithium battery welding equipment in the production line. Specifically, the lithium battery welding equipment is arranged on one side of the lithium battery conveyor line, and the welding head 410 is horizontally arranged and arranged outside the frame 100. At this time, the welding head 410 can be placed in the lithium battery conveyor line, so as to facilitate the welding of lithium batteries.

[0034] In one embodiment, reference Figure 6 , the welding head assembly 400 also includes a proximity sensor 440, and the proximity sensor 440 is mounted on the fixing seat 450 and is arranged above the welding head 410. Further, the welding head 410 includes a mounting portion 411 and a welding portion 412, wherein the fixing seat 450 fixes the welding head 410 on the ultrasonic horn 420 by clamping the mounting portion 411, and the welding portion 412 is used to contact with the lithium battery and weld the lithium battery, and further, the fixing seat 450 is provided with a first end and a second end opposite to each other, wherein the first end is arranged between the second end and the welding portion 412, and specifically, the proximity sensor 440 is arranged on a side of the second end away from the welding portion, and in this way, the fixing seat 450 can also play a protective effect on the proximity sensor 440. Furthermore, the proximity sensor 440 is arranged above the welding head 410 for the purpose of ensuring the installation of the welding head 410 and realizing foolproofing. It should be noted that the proximity sensor sends a confirmation signal only after the welding head 410 is correctly installed in the preset position, and the welding equipment can be started or continued to operate at this time. If the welding head 410 is not installed in the correct position, the proximity sensor 440 does not send a signal, thereby preventing the welding equipment from starting or continuing to operate. Furthermore, the proximity sensor 440 is arranged at intervals from the welding head 410, wherein the welding head 410 is provided with a unique identification feature (hole, groove, etc.), and the proximity sensor 440 identifies the unique identification feature on the welding head 410.

[0035] In one embodiment, reference Figure 2 , Figure 7The frame 100 includes a movable base 120 and a mounting frame 130, the mounting frame 130 is fixed to the movable base 120, the mounting cavity 110 is provided on the mounting frame 130, and the servo motor linear drive structure 200 is installed on the mounting frame 130; the movable base 120 has an unlocked state and a locked state, in the unlocked state, the mounting frame 130 can move along a first direction, in the locked state, the mounting frame 130 can be positioned at a preset position. Furthermore, in one embodiment, the movable base 120 includes a fixed plate 121, a movable plate 122 and a locking member 123, the mounting frame 130 is fixedly arranged on the movable plate 122, and the movable plate 122 is slidably engaged with the fixed plate 121; the locking member 123 has an unlocked state and a locked state, in which the movable plate 122 can move relative to the fixed plate 121 in the unlocked state, and in the locked state, the movable plate 122 can be fixed relative to the fixed plate 121, wherein the locking member 123 can be configured as a bolt, wherein the bolt passes through the movable plate 122 and abuts against the fixed plate 121, and by tightening the bolt, the movable plate 122 can be fixed relative to the fixed plate 121 under the action of friction, and the movable base 120 is in a locked state; by loosening the bolt, the friction between the bolt and the fixed plate 121 is reduced, and the movable plate 122 can move relative to the fixed plate 121, and the movable base 120 is in an unlocked state. Further, in the unlocked state, the position of the movable plate 122 can be movable, and the position of the mounting frame 130 can also be movable. When the position of the mounting frame 130 is movable, the position of the welding head assembly 400 can also be movable. When the lithium battery production line replaces lithium batteries of other structures and causes the welding position of the lithium battery to change, the movable base 120 can be adjusted to the unlocked state, and then the position of the mounting frame 130 is adjusted by the movable plate 122, and then the position of the welding head assembly 400 is adjusted, so that the welding head 410 can be close to the welding position, or correspond to the welding position. Such a setting can improve the applicability of the lithium battery welding equipment. Further, in some embodiments, a plurality of slots can be opened on the fixed plate 121, and a latch is provided on the movable plate 122. The locking member 123 is configured as a latch, wherein the latch is arranged through the fixed plate 121. At this time, when the latch is inserted into one of the slots, the movable base 120 is in a locked state, and when the latch is pulled out of the slot, the movable base 120 is in an unlocked state.

[0036] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lithium battery welding device, characterized in that: include: A frame having a mounting cavity; A servo motor linear drive structure is installed on the frame; The cylinder linear drive structure is slidably disposed in the installation cavity, and the servo motor linear drive structure is connected to the cylinder linear drive structure, and can drive the cylinder linear drive structure to rise and fall; as well as A welding head assembly is installed on the cylinder linear drive structure, and the cylinder linear drive structure can drive the welding head assembly to rise and fall; The moving distance of the welding head assembly driven by the servo motor linear drive structure is greater than the moving distance of the welding head assembly driven by the cylinder linear drive structure. The servo motor linear drive structure, the cylinder linear drive structure and the welding head assembly are arranged in sequence from top to bottom.

2. The lithium battery welding equipment according to claim 1, characterized in that: The servo motor linear drive structure includes a servo motor, a screw, a screw seat, a transmission block, a first movable block and a guide rail, wherein the guide rail is fixed in the installation cavity, the first movable block is slidably arranged on the guide rail, the screw seat is fixed in the installation cavity, one end of the screw is installed on the screw seat, and the other end is connected to the transmission block, the transmission block is fixed to the first movable block, and the output end of the servo motor is drivingly connected to the screw; the cylinder linear drive structure is installed on the first movable block.

3. The lithium battery welding equipment according to claim 2, characterized in that: The cylinder linear drive structure includes a cylinder part and a second movable block. The cylinder part is drivingly connected to the second movable block. The cylinder part is fixed to the first movable block. The second movable block is located below the first movable block and is slidably arranged on the guide rail. The second movable block is used for installing the welding head assembly.

4. The lithium battery welding equipment according to claim 3, characterized in that: The lithium battery welding equipment also includes a self-weight compensation component, which connects the first movable block and the second movable block.

5. The lithium battery welding equipment according to claim 4, characterized in that: The self-weight compensation component includes a connecting rod and a buffer cavity. The buffer cavity is arranged on the first movable block. One end of the connecting rod is connected to the second movable block, and the other end is arranged on the buffer cavity.

6. The lithium battery welding equipment according to claim 3, characterized in that: The welding head assembly includes a welding head, an ultrasonic horn, a fixing seat, and a mounting seat. The mounting seat is fixed to the second movable block, the ultrasonic horn is fixed to the mounting seat, the fixing seat is fixed to the mounting seat by screw locking, and the welding head is connected to the ultrasonic horn via the fixing seat.

7. The lithium battery welding equipment according to claim 6, characterized in that: The welding head is arranged horizontally.

8. The lithium battery welding equipment according to claim 7, characterized in that: The welding head assembly also includes a proximity sensor, which is installed on the fixing seat above the welding head.

9. The lithium battery welding equipment according to any one of claims 1 to 8, characterized in that: The frame comprises a movable base and a mounting frame, the mounting frame is fixedly mounted on the movable base, the mounting cavity is arranged on the mounting frame, and the servo motor linear drive structure is mounted on the mounting frame; The movable base has an unlocked state and a locked state. In the unlocked state, the mounting bracket can move along a first direction, and in the locked state, the mounting bracket can be positioned at a preset position.

10. The lithium battery welding equipment according to claim 9, characterized in that: The movable base comprises a fixed plate, a movable plate and a locking member, the mounting frame is fixed to the movable plate, and the movable plate is slidably connected to the fixed plate; The locking member has an unlocking state and a locking state. In the unlocking state, the movable plate can move relative to the fixed plate. In the locking state, the movable plate can be fixed relative to the fixed plate.

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