Welding clamping fixture and welding equipment

Abstract

The present invention discloses a welding clamping jig and welding equipment. The welding clamping jig of the present invention is used to weld a current collecting plate to a battery housing, and includes a base, a rotating mechanism, a first clamping mechanism and a second clamping mechanism, wherein the rotating mechanism is rotatably connected to the base; the first clamping mechanism and the second clamping mechanism are both arranged on the rotating mechanism, and the first clamping mechanism includes a first clamping part and a second clamping part, and the first clamping part and the second clamping part jointly define a placement cavity for placing the battery housing, and the distance between the first clamping part and the second clamping part can be adjusted to increase or reduce the radial cross-sectional area of ​​the placement cavity; the second clamping mechanism is evenly distributed along the circumference of the placement cavity, and the second clamping mechanism includes a pressing claw that can be moved radially along the placement cavity to clamp the side wall of the current collecting plate to the inner wall of the battery housing. The fixed clamping of the battery housing and the current collecting plate is achieved by the welding clamping jig for easy welding.

Description

Technical Field

[0001] The invention relates to the field of cylindrical battery manufacturing, and in particular to a welding clamping jig and welding equipment. Background Art

[0002] The lithium battery industry has developed rapidly in recent years. In the production process of cylindrical batteries, the welding process of collector plates is generally divided into two steps. First, the collector plates are placed one by one manually, and then the battery shells with collector plates are spot welded one by one on a spot welding machine manually. Such a production process requires a lot of manpower, has very low work efficiency, and has high labor costs. In addition, the spot welding consistency of the product is poor, which is easy to cause cold welding, exploded welding and other phenomena, resulting in a large number of defective products and unstable battery performance.

[0003] The collector plate includes a circular end face and a flange extending from the outer ring of the end face, and a welding area is provided on the flange for connecting the collector plate and the battery shell. In the prior art, some automated collector plate welding equipment uses a manipulator to clamp and position the collector plate, and another manipulator to clamp and position the battery shell. Then, a laser head that can rotate around its own rotation axis is required to weld the collector plate circumferentially. The whole set of equipment requires the cooperation of multiple manipulators, and has a complex structure, a large volume, and extremely high cost. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a welding clamping jig, through which the battery housing and the current collector are fixedly pressed to facilitate welding, and prevent the battery housing or the current collector from moving during the welding process, causing welding failure.

[0005] The present invention also provides a welding device having the welding clamping fixture.

[0006] A welding clamping jig according to an embodiment of the first aspect of the present invention is used to weld a current collecting plate to a battery housing, comprising:

[0007] Pedestal;

[0008] A rotating mechanism, the rotating mechanism is rotatably connected to the base;

[0009] A first pressing mechanism, disposed on the rotating mechanism, comprises a first pressing portion and a second pressing portion, wherein the first pressing portion and the second pressing portion jointly define a placement cavity for accommodating the battery housing, and a distance between the first pressing portion and the second pressing portion can be adjusted to increase or decrease a radial cross-sectional area of ​​the placement cavity;

[0010] A second clamping mechanism, at least two of which are arranged on the rotating mechanism and are evenly distributed along the circumference of the placement cavity. The second clamping mechanism includes a pressing claw, which can move radially along the placement cavity to press the side wall of the collecting plate onto the inner wall of the battery shell.

[0011] The welding clamping jig according to the embodiment of the present invention has at least the following beneficial effects: the first clamping mechanism realizes the fixation of the battery shell, the second clamping mechanism realizes the fixation of the relative position of the collector plate and the battery shell, and then the battery shell and the collector plate are fixed and clamped by the welding clamping jig to facilitate welding, and prevent the battery shell or the collector plate from moving during the welding process and causing welding failure. The jig realizes the positioning, fixing and clamping of the battery and the collector plate through the jig tooling, and can drive the battery shell and the collector plate to rotate through the rotating mechanism, and then the laser head is fixed and the battery shell rotates to realize welding along the circumference of the collector plate, replacing the operation of rotating, grabbing and positioning the laser head, and the degree of freedom of the laser head is relatively low, which reduces the equipment cost of laser welding.

[0012] According to some embodiments of the present invention, the second clamping mechanism comprises a moving member, a fixed member and an elastic member, the fixed member is connected to the rotating mechanism, the moving member is slidably connected to the fixed member, the pressing claw is arranged on the moving member, and the moving member is driven by the elastic member and has a tendency to move along the radial direction of the placement cavity;

[0013] Among them, the welding clamping fixture also includes a first driving mechanism, which is arranged on the base and includes a pushing member. The pushing member can move relative to the base, and the pushing member can move to abut against the moving member to switch the second clamping mechanism to a released state, or the pushing member can move to separate from the moving member to switch the second clamping mechanism to a clamped state.

[0014] According to some embodiments of the present invention, the movable member, the elastic member and the fixed member are arranged in sequence along the direction from the central axis of the placement cavity to the cavity wall, and the elastic member is in a stretched state so that the movable member has a tendency to move toward the fixed member.

[0015] According to some embodiments of the present invention, a first limiting protrusion is provided on the side walls on both sides of the moving direction of the movable member, a limiting block is provided on the fixed member, a through hole is opened on the limiting block along the moving direction, and the second clamping mechanism also includes a threaded fastener, which is passed through the through hole. In the clamping state, the end of the threaded fastener is abutted against the first limiting protrusion, and the threaded fastener can be rotated to adjust the compression amount of the elastic member.

[0016] According to some embodiments of the present invention, the first clamping part is capable of moving relative to the second clamping part, and there is a second clamping mechanism arranged along the moving direction of the first clamping part, which is set as a central clamping mechanism. The first clamping mechanism includes two second driving mechanisms, and the two second driving mechanisms are distributed on both sides of the central clamping mechanism to drive the first clamping part to move.

[0017] According to some embodiments of the present invention, a third pressing mechanism is further included, and the third pressing mechanism can move along the axial direction of the placement cavity to press the end surface of the collecting plate.

[0018] According to some embodiments of the present invention, the third clamping mechanism includes an end pressure plate, which is arranged in the placement cavity. The outer peripheral surface of the end pressure plate can form a gap with the inner wall of the battery shell, and the pressure claw can be located in the gap and move radially along the battery shell.

[0019] According to some embodiments of the present invention, the first clamping part is capable of moving relative to the second clamping part, one of the rotating mechanism or the first clamping part is provided with a limiting groove, and the other is provided with a second limiting protrusion, the second limiting protrusion is inserted into the limiting groove to limit the displacement of the first clamping part, a damping buffer is provided on the groove wall of the limiting groove close to the placement cavity, and a buffer pad is provided on the groove wall of the limiting groove away from the placement cavity.

[0020] According to some embodiments of the present invention, the first clamping portion includes a first covering member, and the second clamping portion includes a second covering member, the first covering member and the second covering member define the placement cavity, and the first covering member and / or the second covering member can move along a closing direction perpendicular to the first clamping portion and the second clamping portion.

[0021] A welding device according to a second aspect of the present invention includes:

[0022] A welding clamping jig as mentioned in any of the above embodiments;

[0023] A laser head, wherein the laser head is used to emit laser;

[0024] The laser head is at a set angle so that the laser can irradiate the welding area of ​​the current collecting plate, and the rotating mechanism can drive the battery housing and the current collecting plate to rotate so as to perform welding along the circumference of the current collecting plate.

[0025] The welding equipment according to the embodiment of the present invention has at least the following beneficial effects: in the welding equipment, the laser head does not need to rotate around its own rotation axis. After the angle of the laser head is adjusted, the laser head can be fixed in one position to emit laser, and the battery housing and the collecting plate are rotated to complete the welding. Since the laser head is the core component for emitting laser, the degree of freedom of the laser head of the welding equipment in this application is not high, and it does not need to be moved during the welding process, so the manufacturing cost of the welding equipment can be controlled.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a schematic structural diagram of a battery housing and a current collecting plate according to an embodiment of the present invention;

[0029] Figure 2 This is an axonometric view of a welding clamping fixture according to an embodiment of the present invention;

[0030] Figure 3 This is a partial enlarged view of the welding clamping fixture according to an embodiment of the present invention (the second clamping mechanism is hidden);

[0031] Figure 4 for Figure 2 An enlarged schematic diagram of region A in FIG.

[0032] Figure 5 for Figure 2 An enlarged schematic diagram of region B in FIG.

[0033] Figure 6 It is a front view of the welding clamping fixture according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] Base 100, rotating mechanism 200, limiting groove 210, damping buffer 211, buffer pad 212, first clamping mechanism 300, first clamping part 310, first covering member 311, second limiting protrusion 312, second clamping part 320, second covering member 321, second clamping mechanism 400, central clamping mechanism 401, moving member 410, first limiting protrusion 411, fixing member 420, limiting block 421, elastic member 430, pressing claw 440, third clamping mechanism 500, end pressure plate 510, collecting plate 600, flange 610, battery housing 650, first driving mechanism 700, pushing member 710, second driving mechanism 800. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] like Figure 1 As shown, the collecting plate 600 includes a circular end surface and a flange 610 extending from the outer ring of the end surface. The flange 610 can be arranged in a whole circle around the end surface of the collecting plate 600, or can be arranged as shown in FIG. Figure 1 The flange 610 is provided with a welding area for connecting the current collecting plate 600 and the battery housing 650. The first embodiment of the present application provides a welding clamping fixture for welding the current collecting plate 600 to the battery housing 650, such as Figure 2 and Figure 3As shown, the welding clamping fixture includes a base 100, a rotating mechanism 200, a first clamping mechanism 300 and a second clamping mechanism 400. The first clamping mechanism 300 and the second clamping mechanism 400 are both arranged on the mounting plate of the rotating mechanism 200. The rotating mechanism 200 can rotate relative to the base 100, thereby driving the first clamping mechanism 300 and the second clamping mechanism 400 to rotate. Figure 3 As shown, Figure 3 The second clamping mechanism 400 is hidden in the middle, and the first clamping mechanism 300 is arranged on the rotating mechanism 200, including a first clamping portion 310 and a second clamping portion 320, and the first clamping portion 310 and the second clamping portion 320 jointly define a placement cavity. Specifically, the first clamping portion 310 includes an arc-shaped first covering member 311, and the second clamping portion 320 includes an arc-shaped second covering member 321. The first covering member 311 and the second covering member 321 define a placement cavity. It should be noted that the first covering member 311 and the second covering member 321 are not necessarily semicircular arcs, but may also be as follows Figure 3 The arc shown in the figure shows that the placement cavity is not necessarily a closed complete cylindrical placement cavity, but can also be a runway-shaped placement cavity. The placement cavity is used to accommodate the battery housing 650. It should be noted that the length of the placement cavity does not need to be greater than the length of the battery housing 650, and can be less than the length of the battery housing 650. The function of the placement cavity is to clamp and fix the battery housing 650. Therefore, under the condition that the battery housing 650 can be clamped and fixed, the battery housing 650 can be partially located in the placement cavity.

[0042] The distance between the first pressing part 310 and the second pressing part 320 can be adjusted to increase or decrease the radial cross-sectional area of ​​the placement cavity. After the battery housing 650 is loaded into the placement cavity, the distance between the first pressing part 310 and the second pressing part 320 is adjusted to close the first pressing part 310 and the second pressing part 320, so that the cross-sectional area of ​​the placement cavity is gradually reduced until the first pressing part 310 and the second pressing part 320 are respectively in contact with the battery housing 650, thereby achieving the fixation of the battery housing 650; after the welding of the collecting plate 600 and the battery housing 650 is completed, the first pressing part 310 and the second pressing part 320 are gradually separated, so that the cross-sectional area of ​​the placement cavity is gradually increased, so that the battery housing 650 can be taken out of the placement cavity.

[0043] In some embodiments, both the first pressing part 310 and the second pressing part 320 can be adjusted. In other embodiments, only the first pressing part 310 or the second pressing part 320 can be adjusted. For example, the first pressing part 310 on the upper side of the welding clamping fixture in this embodiment can move downward, and the second pressing part 320 on the lower side is fixedly arranged on the rotating mechanism 200. The battery housing 650 is inserted into the placement cavity from back to front, and then the first pressing part 310 moves downward to fix the battery housing 650. The first pressing part 310 can be driven by a cylinder or a motor screw structure, or it can be manually operated to slide or lock.

[0044] The welding clamping fixture includes at least two second clamping mechanisms 400. The number of the second clamping mechanisms 400 can be determined according to the size of the pressing claw 440 or the specific structure of the flange 610 of the collecting plate 600. The second clamping mechanisms 400 are evenly distributed along the circumference of the placement cavity, such as Figure 2 and Figure 6 As shown, in this embodiment, three second clamping mechanisms 400 are arranged at intervals of 120°. In other embodiments, two second clamping mechanisms 400 may also be symmetrically arranged. The second clamping mechanism 400 includes a pressing claw 440, which extends into the shell of the battery shell 650, and the pressing claw 440 can move along the radial direction of the placement cavity with the moving member 410. Then, the pressing claw 440 first abuts against the flange 610 of the current collecting plate 600, and then the flange 610 of the current collecting plate 600 is pressed against the inner wall of the shell of the battery shell 650, so that the current collecting plate 600 will not move or shake relative to the battery shell 650, so as to facilitate welding. On the other hand, making the flange 610 of the current collecting plate 600 close to the inner wall of the battery shell 650 can effectively reduce the possibility of welding gaps during welding and improve welding quality.

[0045] Based on the above, the first clamping mechanism 300 realizes the fixation of the battery housing 650, and the second clamping mechanism 400 realizes the fixation of the relative position of the current collecting plate 600 and the battery housing 650, and then the battery housing 650 and the current collecting plate 600 are fixed and clamped through the welding clamping jig to facilitate welding, and prevent the battery housing 650 from moving or the current collecting plate 600 from moving during the welding process, causing welding failure. The jig realizes the positioning, fixing and clamping of the battery housing 650 and the current collecting plate 600 through the jig tooling, and can drive the battery housing 650 and the current collecting plate 600 to rotate through the rotating mechanism 200, and then the laser head is fixed and the battery housing 650 rotates to realize welding along the circumference of the current collecting plate 600, replacing the operation of rotating, grabbing and positioning the laser head, and the degree of freedom of the laser head is required to be lower, which reduces the equipment cost of laser welding.

[0046] In some embodiments, Figure 4As shown, the second clamping mechanism 400 includes a moving member 410, a fixed member 420 and an elastic member 430, the fixed member 420 is connected to the rotating mechanism 200, the moving member 410 is slidably connected to the fixed member 420, one end of the elastic member 430 is connected to the moving member 410, and the other end is connected to the fixed member 420, so that the moving member 410 can be subjected to pressure or tension from the elastic member 430 when moving. The pressing claw 440 is disposed on the moving member 410 and can move with the movement of the moving member 410. The moving member 410 is driven by the elastic member 430 and has a tendency to move along the radial direction of the placement cavity. When the pressure claw 440 is set to press the flange 610 of the current collecting plate 600 onto the inner wall of the battery housing 650, it is a pressed state. When the pressure claw 440 is set to separate from the flange 610 of the current collecting plate 600, it is a loosened state. In some embodiments, in the pressed state and the loosened state, the elastic member 430 is in a stretched state, and the movable member 410 has a tendency to move toward the fixed member 420. Since the movable member 410 and the elastic member 430 are sequentially arranged in the direction from the center to the periphery of the placement cavity, the pressure claw 440 has a tendency to move toward the inner wall of the battery housing 650. Without being affected by other thrusts, the pressure claw 440 can press the flange 610 of the current collecting plate 600 onto the inner wall of the battery housing 650.

[0047] In addition, if Figure 2 and Figure 4 As shown, the welding clamping fixture also includes a first driving mechanism 700, which is arranged on the base 100 and includes a pushing member 710. The second clamping mechanism 400 and the pushing member 710 are arranged in sequence along the direction from the central axis of the placement cavity to the cavity wall. The pushing member 710 can move relative to the base 100 along the radial direction of the placement cavity. The pushing member 710 can move to abut against the moving member 410 to switch the second clamping mechanism 400 to a released state, or the pushing member 710 can move to separate from the moving member 410 to switch the second clamping mechanism 400 to a clamped state. After the supporting member is separated from the movable member 410, the pressing claw 440 is pulled by the elastic member 430 to press the flange 610 of the current collecting plate 600 to the inner wall of the battery shell 650 and can still maintain the pressing state, so that during subsequent welding, the rotating mechanism 200 drives the first clamping mechanism 300, the second clamping mechanism 400, the battery shell 650 and the current collecting plate 600 to rotate together, and rotational welding is performed on the basis of ensuring that the battery shell 650 is clamped by the first clamping mechanism 300 and the current collecting plate 600 is clamped by the second clamping mechanism 400.

[0048] In some embodiments, the first limiting protrusion 411 is provided on the side walls of both sides of the moving part 410 along the moving direction, and the limiting block 421 is provided on the fixed part 420. Specifically, along the direction from the central axis of the placement cavity to the cavity wall, the first limiting protrusion 411 and the limiting block 421 are provided in sequence, and the first limiting protrusion 411 can abut against the limiting block 421, thereby determining the limit position of the outward movement of the moving part 410. Furthermore, the first limiting protrusion 411 does not abut against the limiting block 421 directly, but abuts against the threaded fastener provided on the limiting block 421, thereby adjusting the pressing force of the pressing claw 440 by adjusting the length of the threaded fastener extending from the limiting block 421.

[0049] Specifically, a through hole is provided on the limit block 421 along the moving direction of the moving member 410, and the second clamping mechanism 400 also includes a threaded fastener, which is inserted into the through hole. In the clamping state, the moving member 410 is not subjected to the thrust of the first driving mechanism 700, and moves outward under the pulling force of the elastic member 430 to the end of the threaded fastener and abuts against the first limiting protrusion 411, thereby realizing that the pressing claw 440 abuts against the flange 610 of the current collecting plate 600. In order to prevent the excessive pulling force of the elastic member 430 from causing the flange 610 of the current collecting plate 600 or the battery housing 650 to be partially deformed or even ruptured, a threaded fastener is provided to fine-tune the clamping force. The compression amount of the elastic member 430 is adjusted by rotating the threaded fastener, and the longer the length of the threaded fastener extending from the limit block 421 toward one end of the first limiting protrusion 411, the smaller the compression amount of the elastic member 430, and the smaller the clamping force of the pressing claw 440 on the flange 610.

[0050] In some embodiments, Figure 6 As shown, the first clamping part 310 can move relative to the second clamping part 320, and the second clamping part 320 is fixedly arranged on the rotating mechanism 200. There is a second clamping mechanism 400 arranged along the moving direction of the first clamping part 310. For easy distinction, the second clamping mechanism 400 is set as a central clamping mechanism 401. In this embodiment, three second clamping mechanisms 400 are arranged, and adjacent second clamping mechanisms 400 are arranged at an angle of 120°. The first clamping part 310 can move in the up and down directions. The central clamping mechanism 401 is vertically arranged on the rotating mechanism 200, and its clamping claw 440 can move in the up and down directions. The clamping claw 440 of the central clamping mechanism 401 is spaced apart from the first covering part 311 of the first clamping part 310, and the second clamping part 320 is fixedly connected to the rotating mechanism 200. The remaining two second clamping mechanisms 400 are inclined at a certain angle to the horizontal plane, and the clamping claws 440 of the remaining two second clamping mechanisms 400 are spaced apart from the second covering part 321 of the second clamping part 320.

[0051] The specific clamping process of the battery shell 650 is: the battery shell 650 is loaded, the first clamping mechanism 300 is clamped, and the second clamping mechanism 400 is clamped. During the clamping process, the first clamping part 310 moves downward and the central clamping mechanism 401 moves upward, with two degrees of freedom to move toward each other. The distance between the pressing claw 440 and the inner wall of the first covering member 311 is difficult to adjust. Therefore, only one second clamping mechanism 400 is provided on the inner side of the first covering member 311, and the moving path of the central clamping mechanism 401 overlaps with the moving path of the first clamping part 310, thereby conveniently and intuitively adjusting the distance in the clamped state, which is convenient for manufacturers to debug the initial state of the equipment and the coordination debugging of the first clamping mechanism 300 and the second clamping mechanism 400. In addition, the first clamping mechanism 300 includes two second driving mechanisms 800, and the two second driving mechanisms 800 are distributed on both sides of the central clamping mechanism 401. Since the central clamping mechanism 401 is arranged on the moving path of the first clamping part 310, the second driving mechanism 800 can only be arranged deviating from the symmetrical center. In order to prevent the battery casing 650 from being damaged due to uneven pressure, two second driving mechanisms 800 are distributed on both sides of the central clamping mechanism 401.

[0052] During the clamping process, if the flange 610 of the collecting plate 600 and the end surface of the collecting plate 600 are not perpendicular, it is possible that the flange 610 of the collecting plate 600 is clamped by the second clamping mechanism 400 and the rear end surface bulges, or the collecting plate 600 expands due to heat during welding, causing the end surface of the collecting plate 600 to bulge, and then the bulging end surface of the collecting plate 600 is easily scratched during the withdrawal process of the pressing claw 440 of the second clamping mechanism 400 when loosening. Figure 3 As shown, the welding clamping fixture of the present application also includes a third clamping mechanism 500, which is mainly used to prevent the pressure claw 440 from scratching the end face of the current collecting disk 600 during the loosening process. Specifically, the third clamping mechanism 500 can move along the axial direction of the placement cavity, and then after the battery housing 650 is placed, the first clamping mechanism 300 clamps the battery housing 650, and the second clamping mechanism 400 presses the flange 610 of the current collecting disk 600. The third clamping mechanism 500 moves axially to abut against the end face of the current collecting disk 600, which can prevent the end face of the current collecting disk 600 from bulging in the direction close to the pressure claw 440, and can prevent the pressure claw 440 from contacting the end face of the current collecting disk 600, reducing the possibility of the pressure claw 440 scratching the end face of the current collecting disk 600.

[0053] Furthermore, the third clamping mechanism 500 includes an end pressure plate 510, and the outer peripheral surface of the end pressure plate 510 can form a gap with the inner wall of the battery shell 650, and the pressure claw 440 can be located in the gap and move radially along the battery shell 650. Since the end of the pressure claw 440 needs to press the root of the flange 610 of the current collecting plate 600, the outer diameter of the end pressure plate 510 needs to be smaller than the inner diameter of the battery shell 650 to reserve space for the pressure claw 440 to move. Since the deformation of the end face of the current collecting plate 600 is mainly concentrated in the center area, the deformation of the surrounding area is relatively small, and even if deformation occurs, the pressure claw 440 will not contact the end face of the current collecting plate 600.

[0054] In some embodiments, Figure 5 As shown, the first pressing part 310 can move downward, one of the rotating mechanism 200 or the first pressing part 310 is provided with a limiting groove 210, and the other is provided with a second limiting protrusion 312, and the second limiting protrusion 312 is inserted into the limiting groove 210 to limit the displacement of the first pressing part 310, and define the limit position of the first pressing part 310 moving up or down. In order to prevent the first pressing part 310 from being damaged by the force of the cylinder or the structural parts of the fixture due to the excessive impact force when it moves to the limit position, a shock absorbing device is provided at both ends of the limiting groove 210. Specifically, a damping buffer 211 is provided on the groove wall of the limiting groove 210 close to the side of the placement cavity, which can effectively consume the kinetic energy of the first pressing part 310 pressing down, so as to prevent the battery housing 650 in the placement cavity from being damaged due to the excessive impact force. A buffer pad 212 is provided on the groove wall of the limiting groove 210 away from the side of the placement cavity, which can prevent the first pressing part 310 from directly colliding with the groove wall of the limiting groove 210 and causing damage.

[0055] In some embodiments, Figure 3As shown, the first pressing part 310 includes a first covering member 311, and the second pressing part 320 includes a second covering member 321. The first covering member 311 and the second covering member 321 define a placement cavity, and the first covering member 311 and / or the second covering member 321 can move along a closing direction perpendicular to the first pressing part 310 and the second pressing part 320. The first covering member 311 and / or the second covering member 321 can both adjust their own centers. In the loose state, the centers of the first covering member 311, the second covering member 321, and the battery housing 650 should be on the same vertical line. In the pressed state, the centers of the first covering member 311, the second covering member 321, and the battery housing 650 should converge at the same point. The positions of the first covering member 311 and the second covering member 321 on the horizontal line can be adjusted and fixed by the threaded fasteners on both sides, so as to adjust the center positions of the first covering member 311 and the second covering member 321. The first covering member 311 and the second covering member 321 can also realize automatic centering of the battery housing 650. As long as the positions of the first covering member 311 and the second covering member 321 are determined, the position of the central axis of the battery housing 650 after being pressed by the first pressing mechanism 300 is also determined.

[0056] The embodiment of the second aspect of the present application proposes a welding device, including the welding clamping fixture and the laser head mentioned in any of the above embodiments, the laser head is at a set angle to emit laser light to the welding area of ​​the collector plate 600, and the rotating mechanism 200 can drive the battery housing 650 and the collector plate 600 to rotate to perform welding along the circumference of the collector plate 600. Furthermore, in the welding device, the laser head does not need to rotate around its own rotation axis. After the angle of the laser head is adjusted, the laser head can be fixed in a position to emit laser light, and the battery housing 650 and the collector plate 600 rotate to complete the welding. Since the laser head is the core component of the laser emission, the manufacturing cost of the laser head in the prior art is relatively high due to the mobile positioning and multi-degree-of-freedom adjustment of the laser head. In the present application, the degree of freedom of the laser head of the welding device is not high, and it does not need to be moved during the welding process, so the manufacturing cost of the welding device can be controlled.

[0057] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. Welding clamping fixture, used to weld the collector plate to the battery housing, It is characterized in that include: Pedestal; A rotating mechanism, the rotating mechanism is rotatably connected to the base; A first pressing mechanism, disposed on the rotating mechanism, comprises a first pressing portion and a second pressing portion, wherein the first pressing portion and the second pressing portion jointly define a placement cavity for accommodating the battery housing, and a distance between the first pressing portion and the second pressing portion can be adjusted to increase or decrease a radial cross-sectional area of ​​the placement cavity; A second clamping mechanism, at least two of which are arranged on the rotating mechanism and are evenly distributed along the circumference of the placement cavity, the second clamping mechanism comprising a pressing claw, the pressing claw being able to move along the radial direction of the placement cavity to press the side wall of the collecting plate onto the inner wall of the battery housing; The second clamping mechanism comprises a moving part, a fixed part and an elastic part, the fixed part is connected to the rotating mechanism, the moving part is slidably connected to the fixed part, the pressing claw is arranged on the moving part, and the moving part is driven by the elastic part and has a tendency to move along the radial direction of the placement cavity; Wherein, the welding clamping fixture further includes a first driving mechanism, which is arranged on the base and includes a pushing member, the pushing member can move relative to the base, the pushing member can move to abut against the moving member so that the second clamping mechanism is switched to a released state, or the pushing member can move to separate from the moving member so that the second clamping mechanism is switched to a clamped state; A third pressing mechanism is also included, and the third pressing mechanism can move along the axial direction of the placement cavity to press the end surface of the collecting plate.

2. The welding clamping jig according to claim 1, It is characterized in that Along the direction from the central axis of the placement cavity to the cavity wall, the movable member, the elastic member and the fixed member are arranged in sequence, and the elastic member is in a stretched state so that the movable member has a tendency to move toward the fixed member.

3. The welding clamping jig according to claim 1, It is characterized in that The movable member is provided with a first limiting protrusion on the side walls on both sides along the moving direction, the fixed member is provided with a limiting block, the limiting block is provided with a through hole along the moving direction, the second clamping mechanism also includes a threaded fastener, the threaded fastener is passed through the through hole, in the clamping state, the end of the threaded fastener is abutted against the first limiting protrusion, and the threaded fastener can be rotated to adjust the compression amount of the elastic member.

4. The welding clamping jig according to claim 1, It is characterized in that The first clamping part is capable of moving relative to the second clamping part. There is a second clamping mechanism arranged along the moving direction of the first clamping part, which is set as a central clamping mechanism. The first clamping mechanism includes two second driving mechanisms, and the two second driving mechanisms are distributed on both sides of the central clamping mechanism to drive the first clamping part to move.

5. The welding clamping jig according to claim 1, It is characterized in that The third clamping mechanism includes an end clamping plate, which is arranged in the placement cavity. The outer peripheral surface of the end clamping plate can form a gap with the inner wall of the battery shell, and the pressing claw can be located in the gap and move radially along the battery shell.

6. The welding clamping jig according to claim 1, It is characterized in that The first clamping part is capable of moving relative to the second clamping part, and one of the rotating mechanism or the first clamping part is provided with a limiting groove, and the other is provided with a second limiting protrusion, and the second limiting protrusion is inserted into the limiting groove to limit the displacement of the first clamping part, and a damping buffer is provided on the groove wall of the limiting groove close to the placement cavity, and a buffer pad is provided on the groove wall of the limiting groove away from the placement cavity.

7. The welding clamping jig according to claim 1, It is characterized in that The first clamping part includes a first covering part, and the second clamping part includes a second covering part. The first covering part and the second covering part define the placement cavity. The first covering part and / or the second covering part can move along a closing direction perpendicular to the first clamping part and the second clamping part.

8. Welding equipment, It is characterized in that include: The welding clamping jig according to any one of claims 1 to 7; A laser head, the laser head is used to emit laser; The laser head is at a set angle so that the laser can irradiate the welding area of ​​the current collecting plate, and the rotating mechanism can drive the battery housing and the current collecting plate to rotate so as to perform welding along the circumference of the current collecting plate.

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