Welding fixtures and welding equipment

Abstract

This application discloses welding fixtures and welding equipment, relating to the field of battery processing technology. The welding fixture includes a cell alignment mechanism, a side pressing mechanism, and a lower pressing mechanism. The cell alignment mechanism has an alignment through hole. The side pressing mechanism is mounted on the cell alignment mechanism and has a side pressing part extending into the alignment through hole. The side pressing part is elastically movable along the radial direction of the alignment through hole. A first mating part is connected to the side pressing part. The lower pressing mechanism is mounted on the cell alignment mechanism and has a second mating part that wedges with the first mating part. The second mating part is movable along the axial direction of the alignment through hole. When the second mating part moves towards the cell alignment mechanism, it engages with the wedge of the first mating part to drive the side pressing part away from the centerline of the alignment through hole, thereby pressing the flange of the current collector against the inner wall of the battery casing. This design greatly reduces the need for additional power sources, simplifies the overall structure, and lowers installation and maintenance costs.

Description

Technical Field

[0001] This application relates to the field of battery processing technology, and in particular to welding tooling and welding equipment. Background Technology

[0002] With the rapid increase in sales of new energy vehicles, the lithium battery industry has also entered a stage of rapid development. Cylindrical batteries are a type of lithium battery. In the production and processing of cylindrical batteries, after the cell is installed in the casing, a current collector welding operation is required. In existing technologies, the current collector structure mostly includes a disk body and several flanges set around the disk body. After the current collector is welded and fixed to the installed cell, it is also necessary to weld and fix the current collector to the battery casing, that is, to weld and fix the flanges to the inner wall of the battery casing (called side welding).

[0003] During side welding, to further ensure the welding quality between the flange and the inner wall of the battery casing, the flange needs to be tightly pressed against the inner wall of the battery casing to reduce the gap between them. This is typically achieved by using a clamping mechanism to press the flange firmly. For example, Chinese Patent CN115609174A discloses a welding clamping fixture and welding equipment, which uses a second clamping mechanism to press the side wall of the current collector against the inner wall of the battery casing to facilitate welding. However, in this design, each second clamping mechanism requires an independent pusher as an additional power source for radial drive, resulting in a complex overall structure and high installation and maintenance costs. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide welding fixtures and welding equipment to solve the technical problems of complex structure and high installation and maintenance costs of the existing devices for achieving the flange tightly attached to the inner wall of the battery casing.

[0005] To achieve the above technical objectives, this application provides welding fixtures, including a cell centering mechanism, a side pressing mechanism, and a pressing mechanism;

[0006] The cell centering mechanism is provided with a centering through hole for the battery casing to extend into;

[0007] The side-pressing mechanism is mounted on the cell centering mechanism and is provided with a side-pressing part extending into the centering through hole;

[0008] The side pressure part is elastically movable along the radial direction of the centering through hole;

[0009] The side pressure part is connected to a first mating part;

[0010] The pressing mechanism is mounted on the cell centering mechanism and is provided with a second mating part that engages with the wedge of the first mating part;

[0011] The second mating part is movably disposed along the axial direction of the centering through hole;

[0012] The second mating part is used to engage with the wedge of the first mating part to drive the side pressing part to move away from the center line of the centering through hole when moving towards the direction of the cell centering mechanism, so as to press the flange of the current collector against the inner wall surface of the battery casing.

[0013] Furthermore, the side-pressing mechanism includes a side-pressing slider, a side-pressing member, and a side-pressing elastic member;

[0014] The side-pressure sliding member is slidably mounted on the cell centering mechanism along the radial direction of the centering through hole;

[0015] The side-pressure elastic element is connected between one end of the side-pressure sliding element and the cell centering mechanism;

[0016] The side pressure member is connected to the other end of the side pressure sliding member and extends into the centering through hole to form the side pressure part;

[0017] The side-pressure sliding member is provided with a first guide slope for forming the first mating part.

[0018] Furthermore, the side pressure member is arc-shaped and is used to press the adjacent ends of two adjacent flanges to press the flanges against the inner wall surface of the battery casing.

[0019] Furthermore, the pressing mechanism includes a pressing drive assembly, a lifting seat, and a supporting elastic element;

[0020] The lifting seat is slidably mounted on the cell centering mechanism along the axial direction of the centering through hole;

[0021] The lifting seat is provided with a second guide slope that cooperates with the wedge of the first guide slope to form a second mating part;

[0022] The supporting elastic element is connected between the lifting seat and the cell centering mechanism;

[0023] The downward drive assembly is connected to the lifting seat and is used to drive the lifting seat to move.

[0024] Furthermore, the downward driving component is provided with an abutment surface arranged along a preset trajectory;

[0025] The lifting seat is pivotally connected to a roller that can contact and abut against the abutment surface and move along the abutment surface.

[0026] Furthermore, it also includes a side pressure adjustment component;

[0027] The side pressure adjustment assembly is mounted on the lifting base and connected to the roller, and is used to adjust the height of the roller relative to the center of gravity of the lifting base along the axial direction of the centering through hole.

[0028] Furthermore, the side pressure adjustment assembly includes an adjustment block, an eccentric shaft, an adjustment seat, and an adjustment elastic element;

[0029] The eccentric shaft is pivotally connected to the adjusting seat;

[0030] The roller is pivotally connected to the eccentric shaft;

[0031] The adjusting block is connected to one end of the eccentric shaft and rotates synchronously with the eccentric shaft;

[0032] The adjusting block is provided with an arc-shaped hole;

[0033] The adjusting seat is provided with a first threaded hole corresponding to the arc-shaped hole;

[0034] A first threaded fastener is inserted into the first threaded hole, passing through the arc-shaped hole;

[0035] The head of the first threaded fastener can contact and abut against the adjusting block to lock the rotation of the adjusting block;

[0036] The adjusting seat is rotatably mounted on the lifting seat, and there is a rotatable adjustment gap between the adjusting seat and the lifting seat;

[0037] The adjusting elastic element is disposed in the flip-adjusting gap, with one end connected to the adjusting seat and the other end connected to the lifting seat;

[0038] The lifting seat is equipped with a limiting component to restrict the maximum rotation angle of the adjusting seat.

[0039] Furthermore, the lifting seat is provided with a dust removal chamber;

[0040] One end of the dust removal chamber penetrates the bottom of the lifting seat and communicates with the centering through hole;

[0041] The lifting platform is equipped with a laser clearance port and a dust removal port that connect to the dust removal chamber;

[0042] A suction pipe is inserted into the dust removal port;

[0043] One end of the suction pipe extends into the dust removal chamber.

[0044] Furthermore, the bottom of the lifting seat is provided with a sealing ring at one end of the dust removal chamber, which is in sealing contact with the battery cell centering mechanism.

[0045] This application also discloses welding equipment, including the aforementioned welding fixtures.

[0046] As can be seen from the above technical solutions, the welding fixture designed in this application utilizes the wedge engagement between the first mating part and the second mating part to achieve movement along the axial direction of the centering through hole to drive the radial movement of the side pressing part, thereby completing the pressing of the flange. Under this design, only one power source is needed to drive the movement of the second mating part, which can engage with one or more first mating parts through wedge engagement. Thus, one power source can control one or more side pressing parts to press the flange, greatly reducing the configuration of additional power sources. The overall structure is simpler and the installation and maintenance costs are lower. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A perspective view showing the application status of the welding fixture provided in this application;

[0049] Figure 2 A perspective view of the welding fixture provided in this application;

[0050] Figure 3 This is a cross-sectional view of the welding fixture provided in this application;

[0051] Figure 4 This is a cross-sectional view of the side pressure mechanism of the welding fixture provided in this application;

[0052] Figure 5 This is a cross-sectional view of the pressing mechanism of the welding fixture provided in this application;

[0053] Figure 6 This is a partial schematic diagram showing the engagement of the first guide ramp and the second guide ramp of the welding fixture provided in this application;

[0054] In the diagram: 100, cell alignment mechanism; 101, alignment carrier; 102, alignment component; 103, clamping plate; 104, connecting block; 105, alignment through hole;

[0055] 200. Side-pressing mechanism; 201. Side-pressing sliding component; 202. Side-pressing component; 203. First guide slope; 204. Side-pressing elastic component;

[0056] 300. Pressing mechanism; 301. Pressing drive assembly; 302. Lifting seat; 303. Dust removal chamber; 304. Sealing ring; 305. Second guide slope; 306. Dust removal port; 307. Suction pipe; 308. Laser clearance port; 309. Adjusting elastic element; 310. Adjusting seat; 311. Eccentric shaft; 312. Roller; 313. Adjusting block; 314. Arc-shaped hole; 315. First threaded fastener; 316. Second threaded fastener; 317. Nut. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0058] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0060] This application discloses welding fixtures in its embodiments.

[0061] Please see Figures 1 to 3 One embodiment of the welding fixture provided in this application includes:

[0062] The battery cell centering mechanism 100, the side pressing mechanism 200, and the downward pressing mechanism 300.

[0063] The cell alignment mechanism 100 is provided with an alignment through hole 105 for the battery casing to extend into.

[0064] The side-pressing mechanism 200 is mounted on the cell alignment mechanism 100 and has a side-pressing part that extends into the alignment through hole 105. When the battery casing extends into the alignment through hole 105, the side-pressing part extends into the battery casing.

[0065] In this application, the flange is designed with an outward tilt angle, that is, the upper end of the flange extends in the direction away from the middle of the disk body. This allows it to fit tightly against the inner wall of the battery casing when actually inserted into the casing, which helps to better press the flange against the inner wall of the battery casing.

[0066] The side pressing part is elastically movable along the radial direction of the centering through hole 105. The elastic setting can realize that the side pressing part can automatically reset after pressing the flange. Furthermore, the side pressing part is connected to the first mating part.

[0067] The pressing mechanism 300 is mounted on the cell centering mechanism 100.

[0068] The pressing mechanism 300 is provided with a second mating part that engages with the wedge of the first mating part. The second mating part is movably disposed along the axial direction of the centering through hole 105. In this application, the axial direction of the centering through hole 105 is the vertical direction from the perspective of installation and use, while the radial direction of the centering through hole 105 refers to the horizontal direction.

[0069] The second mating part, when moving towards the cell alignment mechanism 100, engages with the first mating part via a wedge-shaped engagement to drive the side pressing part away from the centerline of the alignment through hole 105, thereby pressing the flange of the current collector against the inner wall surface of the battery casing. It can be understood that the second mating part engages with the first mating part via a downward pressing motion, thus converting the vertical movement into a horizontal movement of the side pressing part, thereby driving the side pressing part.

[0070] The side pressure mechanism 200 in this application can be designed differently based on the number of flanges. When there are multiple flanges, they can be distributed circumferentially around the axis of the centering through hole 105. The corresponding first mating parts are also multiple. The first mating parts are arc-shaped, while the second mating parts are ring-shaped. The second mating parts can be wedge-fitted with a single first mating part or wedge-fitted with multiple second mating parts simultaneously. This allows the movement of each side pressure part to be driven by the lifting and lowering motion of the second mating parts.

[0071] As can be seen from the above technical solutions, the welding fixture designed in this application utilizes the wedge engagement between the first mating part and the second mating part to achieve movement along the axial direction of the centering through hole 105 to drive the radial movement of the side pressing part and complete the pressing of the flange. Under this design, only one power source is needed to drive the movement of the second mating part, which can engage with one or more first mating parts through wedge engagement, thereby realizing that one power source can control one or more side pressing parts to press the flange, greatly reducing the configuration of additional power sources, making the overall structure simpler and the installation and maintenance costs lower.

[0072] The above is Embodiment 1 of the welding fixture provided in this application. The following is Embodiment 2 of the welding fixture provided in this application. Please refer to the following for details. Figures 1 to 6 .

[0073] Based on the solution of Embodiment 1 above:

[0074] Furthermore, such as Figure 4 As shown, the design of the side-pressure mechanism 200 includes a side-pressure sliding member 201, a side-pressure member 202, and a side-pressure elastic member 204.

[0075] The side-pressure sliding member 201 is slidably mounted on the cell centering mechanism 100 along the radial direction of the centering through hole 105; a sliding groove can be opened on the cell centering mechanism 100, and the side-pressure sliding member 201 is slidably mounted on the sliding groove to achieve sliding setting.

[0076] The side-pressure elastic element 204 is connected between one end of the side-pressure sliding element 201 and the cell centering mechanism 100 to provide elastic force so that the side-pressure sliding element 201 can be reset. The side-pressure elastic element 204 can be a spring.

[0077] The side pressure member 202 is connected to the other end of the side pressure sliding member 201 and extends into the centering through hole 105 to form a side pressure part; the side pressure sliding member 201 is provided with a first guide slope 203 to form a first mating part.

[0078] Regarding the design of the side-pressure sliding member 201, it may include a sliding block portion and a mating block portion; the mating block portion is vertically connected to one end of the sliding block portion and is arranged upwards, and the corresponding first guide slope 203 may be formed on the mating block portion. The side-pressure member 202 is vertically connected to the other end of the sliding block portion and extends downwards into the centering through hole 105. The side-pressure member 202 and the side-pressure sliding member 201 can be integrally formed, without limitation.

[0079] Furthermore, the side clamping member 202 is arc-shaped to better accommodate the arc-shaped flange clamping. Specifically, the side clamping member 202 is used to clamp the adjacent ends of two adjacent flanges to press the flanges against the inner wall surface of the battery casing. The side clamping member 202 can be designed to include a connecting portion and a clamping portion, both of which are arc-shaped, and the connecting portion is connected to the other end of the sliding block portion.

[0080] The clamping part can be plate-shaped, with the connecting part connected to the clamping part and arranged in a T-shape; alternatively, the clamping part can be a V-shaped structure, with the connecting part connected to the clamping part and arranged in a Y-shape, as long as the clamping part can clamp the adjacent ends of the two flanges. In this application, the arc-shaped side clamping member 202 clamps the ends of the flanges, rather than the entire flange, to accommodate flanges with lower heights. Because for flanges with lower heights, laser welding is not suitable for directly welding the sides of the flanges; typically, the upper edge of the flange is welded.

[0081] Of course, it should be noted that the clamping part can also clamp the entire side of the flange. When clamping the entire side of the flange, an clearance groove can be opened on the side clamping part 202 to allow the laser to pass through for welding.

[0082] Furthermore, such as Figure 1 , Figure 2 , Figure 5 as well as Figure 6 As shown, the pressing mechanism 300 includes a pressing drive assembly 301, a lifting seat 302, and a supporting elastic element (not shown in the figure).

[0083] The lifting seat 302 is slidably mounted on the cell alignment mechanism 100 along the axial direction of the alignment through hole 105. This sliding mounting can be achieved by using a guide post; that is, a guide post is fixed on the cell alignment mechanism 100, and a guide hole is provided on the lifting seat 302 for the guide post to pass through. A stop structure is provided on the guide post to contact and abut against the lifting seat 302, serving as a limiting mechanism. This allows the lifting seat 302 to slide along the guide post.

[0084] The bottom of the lifting seat 302 is provided with a second guide slope 305 that cooperates with the wedge of the first guide slope 203 to form a second mating part; the bottom of the lifting seat 302 can be cylindrical, and the second guide slope 305 is arranged around the bottom edge, so that it can cooperate with multiple arc-shaped first guide slopes 203 together.

[0085] A support elastic element connects the lifting seat 302 and the battery cell centering mechanism 100, providing elastic support for the lifting seat 302. This support elastic element's design allows the lifting seat 302 to have a reset force, thus offering greater design flexibility in the drive system. Furthermore, this support elastic element acts as a buffer, preventing the lifting seat 302 from excessively compressing the side-pressure sliding member 201, which could lead to damage. This support elastic element is a spring, sleeved on the guide post, and its specific configuration is not limited. More importantly, by changing the compression of this support elastic element, the supporting force of the support elastic element on the lifting seat 302 can be altered, thereby changing the force exerted by the lifting seat 302 on the side-pressure sliding member 201, and ultimately changing the clamping force of the side-pressure member 202 on the flange.

[0086] The downward drive assembly 301 is connected to the lifting seat 302 and is used to drive the lifting seat 302 to move.

[0087] Furthermore, most existing manifold welding fixtures are mounted on a turntable, meaning the welding fixture itself has a rotational motion trajectory. Based on this, the rotational motion trajectory can be utilized.

[0088] Specifically, such as Figure 1 As shown, the downward drive component 301 can be designed as a cam structure, with a contact surface set along a preset trajectory at its bottom. A roller 312 is pivotally connected to the lifting seat 302, which can contact and abut against the contact surface and move along the contact surface.

[0089] The roller 312 moves along the track surface driven by the turntable, and under the action of the track surface, it can achieve lifting and lowering motion, thereby realizing the lifting seat 302. Of course, the track groove can also be rotating or moving, so that the roller 312 passing through can move up and down. This track-driven method can refer to existing track-driven designs.

[0090] The downward drive component 301 can also be a telescopic cylinder or other lifting device, without limitation. When in use, the roller 312 always presses against the drive end of the lifting device or the track surface on the cam structure.

[0091] Furthermore, taking the side pressure mechanism 200 as an example with a supporting elastic element, in order to adjust the clamping force of the side pressure element 202 on the flange, a side pressure adjustment component is also included.

[0092] The side pressure adjustment component is mounted on the lifting seat 302 and connected to the roller 312. It is used to adjust the height of the roller 312 relative to the center of gravity of the lifting seat 302 along the axial direction of the centering through hole 105, that is, to adjust the distance between the roller 312 and the lifting seat 302. Since the roller 312 is always pressed against the contact surface under the action of the supporting elastic element, when the side pressure adjustment component increases the distance between the roller 312 and the lifting seat 302, it corresponds to lowering the height of the center of gravity of the lifting seat 302. At this time, the compression force on the supporting elastic element increases, and the reaction force generated is also greater. Conversely, the height of the center of gravity of the lifting seat 302 increases, the compression force on the supporting elastic element decreases, and the reaction force generated is also smaller. This allows the lifting seats at different heights of gravity to contact the side pressure sliding element 201, thereby achieving the purpose of adjusting different clamping forces.

[0093] Furthermore, such as Figure 2 as well as Figure 5 As shown, the side pressure adjustment assembly may specifically include an adjustment block 313 and an eccentric shaft 311.

[0094] The eccentric shaft 311 is pivotally connected to the lifting seat 302, while the roller 312 is pivotally connected to the eccentric shaft 311.

[0095] An adjusting block 313 is connected to one end of an eccentric shaft 311 and rotates synchronously with the eccentric shaft 311. The adjusting block 313 has an arc-shaped hole 314, and the lifting seat 302 has a first threaded hole (not shown) corresponding to the arc-shaped hole 314. A first threaded fastener 315, passing through the arc-shaped hole 314, is inserted into the first threaded hole. The head of the first threaded fastener 315 can contact and abut against the adjusting block 313 to lock the rotation of the adjusting block 313. To facilitate the installation of the eccentric shaft 311, the cell centering mechanism 100 has two protrusions. The eccentric shaft 311 is pivotally connected to the two protrusions, and the roller 312 is located between the two protrusions. The corresponding first threaded hole can be opened on a protrusion near the adjusting block 313. During adjustment, rotating the adjusting block 313 will drive the eccentric shaft 311 to rotate. The rotation of the eccentric shaft 311 will change the height of the rotation center line of the roller 312 relative to the lifting seat 302, that is, change the height of the center of gravity of the roller 312 relative to the lifting seat. Increasing the height of the rotation center line of the roller 312 relative to the lifting seat 302 will correspondingly decrease the height of the center of gravity of the lifting seat 302, and vice versa. After the adjustment is completed, tightening the first threaded fastener 315 will lock the adjusting block 313. When a larger clamping force is required, the height of the rotation center line of the roller 312 relative to the lifting seat 302 can be increased, and vice versa.

[0096] Furthermore, the side pressure adjustment assembly may also include an adjustment seat 310 and an adjustment elastic element 309. For example, the roller 312 is pivotally connected to the adjustment seat 310.

[0097] The adjusting seat 310 is rotatably mounted on the lifting seat 302 in the vertical direction, and there is a rotatable adjustment gap between the adjusting seat 310 and the lifting seat 302. The adjusting elastic element 309 is set in the rotatable adjustment gap, with one end connected to the adjusting seat 310 and the other end connected to the lifting seat 302. The adjusting elastic element 309 can be a spring, and there is no specific limitation.

[0098] The lifting seat 302 is equipped with a limiting member for limiting the maximum tilting angle of the adjusting seat 310. Specifically, the limiting member can be a second threaded fastener 316.

[0099] A second threaded hole (not shown in the figure) is provided on the lifting seat 302, and a second threaded fastener 316 is inserted into the second threaded hole, passing through the adjusting seat 310; the head of the second threaded fastener 316 can contact and abut against the adjusting seat 310 to limit the maximum tilting angle of the adjusting seat 310.

[0100] The adjusting elastic element 309 supports the adjusting seat 310. When it is necessary to lower the height of the roller 312 relative to the lifting seat 302, press the adjusting seat 310 so that it overcomes the force of the adjusting elastic element 309 and flips downward at a certain angle. Then tighten the second threaded fastener 316. When raising, slowly turn the second threaded fastener 316. Under the force of the adjusting elastic element 309, the adjusting seat 310 slowly flips upward. In order to provide a better locking effect for the adjusted second threaded fastener 316, a nut 317 can be fitted on the second threaded fastener 316. After the adjustment is completed, turn the nut 317 until it contacts and abuts against the cell centering mechanism 100. In this application, both the first threaded fastener 315 and the second threaded fastener 316 can be screws or bolts, without limitation.

[0101] Furthermore, the side pressure adjustment can also be a component including an adjustment block 313, an eccentric shaft 311, an adjustment seat 310, and an adjustment elastic element 309, that is, combining the two adjustment methods mentioned above.

[0102] Based on this design, the eccentric shaft 311 is pivotally connected to the adjusting seat 310; the roller 312 is pivotally connected to the eccentric shaft 311; the adjusting block 313 is connected to one end of the eccentric shaft 311 and rotates synchronously with the eccentric shaft 311; the adjusting block 313 is provided with an arc-shaped hole 314; the adjusting seat 310 is provided with a first threaded hole corresponding to the arc-shaped hole 314; a first threaded fastener 315 is inserted into the first threaded hole and passes through the arc-shaped hole 314; the head of the first threaded fastener 315 can contact and abut against the adjusting block 313 to lock the rotation of the adjusting block 313.

[0103] The adjusting seat 310 is rotatably mounted on the lifting seat 302, and there is a rotatable adjustment gap between the adjusting seat 310 and the lifting seat 302; the adjusting elastic element 309 is disposed in the rotatable adjustment gap, one end of which is connected to the adjusting seat 310 and the other end of which is connected to the lifting seat 302; the lifting seat 302 is provided with a second threaded hole; a second threaded fastener 316 is inserted into the second threaded hole and passes through the adjusting seat 310; the head of the second threaded fastener 316 can contact and abut against the adjusting seat 310 to limit the maximum rotatable angle of the adjusting seat 310.

[0104] This design allows for dual adjustment, providing a wider range of adjustment and better applicability. In addition, the combination of the supporting elastic element and the adjusting elastic element 309 can also provide better cushioning.

[0105] In this application, the roller 312 is always pressed against the trajectory surface of the cam structure under the action of the support spring and the adjusting spring. The bottom surface of the lifting seat 302 with the second guide slope 305 has a gap A with the cell centering mechanism 100, the inclination angle of the second guide slope 305 is B, and there is a gap C between the side pressure member 202 and the flange. In the design, C < A / tanB, to ensure that the side pressure member 202 can always press against the flange, thereby transmitting force. When the adjusting block 313 is rotated and / or the second threaded fastener 316 is tightened, the height of the center of gravity of the roller 312 relative to the lifting seat 302 can be changed, thereby changing the tightness of the adjusting elastic member 309 and the supporting elastic member. The tightness of the spring is fed back to the lifting seat 302, which is manifested as a change in the downward pressure of the lifting seat 302. Through the cooperation of the first guide slope 203 and the second guide slope 305, it is converted into a change in the pressure of the side pressure member 202, thereby realizing the adjustment of the clamping force.

[0106] The clamping force can be adjusted to accommodate the deformation of the flange and ensure a tight fit. At the same time, the deformation of the side pressure component 202 can be improved by adjusting the clamping force.

[0107] Furthermore, such as Figure 2 As shown in Figure 5, the lifting seat 302 is provided with a dust removal chamber 303. One end of the dust removal chamber 303 passes through the bottom of the lifting seat 302 and is connected to the centering through hole 105.

[0108] The lifting platform 302 is provided with a laser avoidance port 308 and a dust removal port 306 that connect to the dust removal chamber 303.

[0109] A suction pipe 307 is inserted into the dust removal port 306. One end of the suction pipe 307 extends into the dust removal chamber 303, specifically to the laser welding point.

[0110] Furthermore, the bottom of the lifting seat 302 is provided with a sealing ring 304 on the outer ring of one end of the dust removal chamber 303, which is in sealing contact with the cell centering mechanism 100. The design of the sealing ring 304 can make the connection and sealing between the dust removal chamber 303 and the centering through hole 105 better, and prevent the protective gas from escaping from the gap between the cell centering mechanism 100 and the bottom surface of the lifting seat 302.

[0111] In this application, the cell alignment mechanism 100 is an existing design of our company, specifically disclosed in patent publication number CN115890086A, entitled "Welding Equipment and Welding Method." Specifically, as... Figures 1 to 3 As shown, the cell alignment mechanism 100 includes an alignment carrier 101 and an alignment member 102. The alignment carrier 101 corresponds to the second movable seat in the aforementioned patent, and the alignment member 102 corresponds to the alignment rotating member in the aforementioned patent. It can be understood that the side pressing mechanism 200 and the downward pressing mechanism 300 designed in this application can be applied based on existing alignment structures. In specific applications, fixing the side pressing mechanism 200 to the alignment member 102 and making it rotate synchronously with the alignment member 102 can expand the top support area of ​​the alignment member 102, thereby providing an installation position for the side pressing mechanism 200. The specific location is not limited. The side-pressing member 202 on the side-pressing mechanism 200 extends into the centering through hole 105 of the centering member 102 and is located between the pressing plate 103 and the inner wall of the centering through hole 105. When the battery casing extends into the centering through hole 105, the pressing plate 103 and the centering member 102 also extend into the battery casing. The pressing plate 103 is used to press the current collector, while the side-pressing member 202, under the action of the pressing mechanism 300, presses the flange on the current collector. The welding laser, injected through the laser clearance port 308, passes through the clearance gap formed between the connecting blocks 104 on the pressing plate 103 to weld the flange. The pressing mechanism 300 can be installed on the centering carrier 101.

[0112] By applying this existing centering structure, the position of the laser welding point can remain unchanged due to its rotation function. Therefore, the design of extending the dust suction pipe 307 to the laser welding point position in this application can effectively enhance the dust removal effect. For how to achieve the rotation of the centering component 102, existing solutions can be referenced, and will not be elaborated here.

[0113] To avoid excessive pressure on the side-pressing sliding member 201, the pressing plate 103 on the cell centering mechanism 100 is designed to contact and abut against the bottom surface of the lifting seat 302, thereby limiting the downward pressure of the lifting seat 302 and thus avoiding excessive pressure on the side-pressing sliding member 201.

[0114] This application also discloses welding equipment, including the welding fixtures of Embodiment 1 or Embodiment 2 described above.

[0115] The welding fixtures and welding equipment provided in this application have been described in detail above. For those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the embodiments of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A welding fixture, characterized by, The battery cell centering mechanism (100), the side pressure mechanism (200) and the downward pressure mechanism (300) are provided. The centering through hole (105) is arranged on the battery cell centering mechanism (100) and is used for the battery shell to extend into. The side pressure mechanism (200) is arranged on the battery cell centering mechanism (100) and is provided with a side pressure part extending into the centering through hole (105). The side pressure part is arranged in the radial direction of the centering through hole (105) and is elastically movable. The first matching part is connected to the side pressure part. The downward pressure mechanism (300) is arranged on the battery cell centering mechanism (100) and is provided with a second matching part matched with the first matching part. The second matching part is arranged in the axial direction of the centering through hole (105) and is movable. When the second matching part moves towards the battery cell centering mechanism (100), the second matching part is matched with the first matching part to drive the side pressure part to move away from the center line of the centering through hole (105) to press the flange of the current collector plate against the inner wall of the battery shell. The side pressure mechanism (200) comprises a side pressure sliding part (201), a side pressure part (202) and a side pressure elastic part (204). The side pressure sliding part (201) is arranged on the battery cell centering mechanism (100) in the radial direction of the centering through hole (105) and is slidably arranged. The side pressure elastic part (204) is connected between one end of the side pressure sliding part (201) and the battery cell centering mechanism (100). The side pressure part (202) is connected to the other end of the side pressure sliding part (201) and extends into the centering through hole (105) to form the side pressure part. The first guide inclined surface (203) is arranged on the side pressure sliding part (201) to form the first matching part. The downward pressure mechanism (300) comprises a downward pressure driving assembly (301), a lifting seat (302) and a supporting elastic part. The lifting seat (302) is arranged on the battery cell centering mechanism (100) in the axial direction of the centering through hole (105) and is slidably arranged. The second guide inclined surface (305) is arranged on the lifting seat (302) and is matched with the first guide inclined surface (203) to form the second matching part. The supporting elastic part is connected between the lifting seat (302) and the battery cell centering mechanism (100). The downward pressure driving assembly (301) is connected with the lifting seat (302) and is used for driving the lifting seat (302) to move. The abutting surface is arranged on the downward pressure driving assembly (301) and is arranged in a preset track. The rolling wheel (312) is pivotally connected to the lifting seat (302) and can contact and abut the abutting surface and move along the abutting surface. The side pressure force adjusting assembly is further provided. The side pressure force adjusting assembly is arranged on the lifting seat (302) and is connected with the rolling wheel (312) and is used for adjusting the mass center height of the rolling wheel (312) relative to the lifting seat (302) in the axial direction of the centering through hole (105).

2. The welding fixture of claim 1, wherein, The side pressing part (202) is arc-shaped, and is used for pressing the end portions of the two adjacent flanges close to each other, so as to press the flanges to the inner wall of the battery shell.

3. The welding fixture of claim 2, wherein, The side pressure adjusting assembly comprises an adjusting block (313), an eccentric shaft (311), an adjusting seat (310) and an adjusting elastic member (309). The eccentric shaft (311) is pivotally connected to the adjusting seat (310). The roller (312) is pivotally connected to the eccentric shaft (311). The adjusting block (313) is connected to one end of the eccentric shaft (311) and rotates synchronously with the eccentric shaft (311). The adjusting block (313) is provided with an arc-shaped hole (314). The adjusting seat (310) is provided with a first threaded hole corresponding to the arc-shaped hole (314). The first threaded hole is provided with a first threaded fastener (315) penetrating through the arc-shaped hole (314). The head of the first threaded fastener (315) can abut against the adjusting block (313), and is used for locking the rotation of the adjusting block (313). The adjusting seat (310) is reversibly installed on the lifting seat (302), and has a reversible adjusting gap with the lifting seat (302). The adjusting elastic member (309) is arranged in the reversible adjusting gap, one end of the adjusting elastic member (309) is connected to the adjusting seat (310), and the other end of the adjusting elastic member (309) is connected to the lifting seat (302). The lifting seat (302) is provided with a limiting member for limiting the maximum reversible angle of the adjusting seat (310).

4. The welding fixture of claim 2, wherein, The lifting seat (302) is provided with a dust removal cavity (303). One end of the dust removal cavity (303) penetrates through the bottom of the lifting seat (302), and is communicated with the centering through hole (105). The lifting seat (302) is provided with a laser avoiding opening (308) and a dust removal opening (306) which are communicated with the dust removal cavity (303). The dust removal opening (306) is provided with a dust suction pipe (307). One end of the dust suction pipe (307) extends into the dust removal cavity (303).

5. The welding fixture of claim 4, wherein, The bottom of the lifting seat (302) is provided with a sealing ring (304) which is in sealing contact with the battery cell centering mechanism (100) outside one end of the dust removal cavity (303).

6. A welding apparatus characterized by, The welding tool comprises the welding tool as claimed in any one of claims 1 to 5.

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