CN217394046U

CN217394046U - Battery BMU board high accuracy welding equipment

Info

Publication number: CN217394046U
Application number: CN202221352716.4U
Authority: CN
Inventors: 秦元新; 黄明亮
Original assignee: Huizhou Xingyuan Automation Equipment Co ltd
Current assignee: Huizhou Xingyuan Automation Equipment Co ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-09-09
Anticipated expiration: 2032-06-01

Abstract

The utility model discloses a battery BMU board high accuracy welding equipment, send first anchor clamps and BMU board positioning mechanism to the position of accepting the anchor clamps through first Y axle transport mechanism and first X axle transport mechanism, the bench machine sends above-mentioned anchor clamps to first anchor clamps and BMU board positioning mechanism, first anchor clamps positioning mechanism advances line location clamp to the anchor clamps, then, first BMU board positioning mechanism advances line location to BMU board and the relative position of waiting to weld both, after the location, first Y axle transport mechanism moves the anchor clamps to CCD detection mechanism, CCD detection mechanism shoots it and calculates its distance from laser welding mechanism, and then send it to below laser welding mechanism, and utilize the pushing mechanism to press down the welding point, and then utilize laser welding mechanism to weld the point of waiting to weld, thereby accomplish automatic high accuracy welding process; the automatic high-precision welding of the BMU plate is realized through the welding equipment, the yield is ensured, and the production efficiency is higher.

Description

Battery BMU board high accuracy welding equipment

Technical Field

The utility model relates to the field of welding technique, specifically be a battery BMU board high accuracy welding equipment.

Background

The BMU board is an automobile battery board or a notebook battery board and is an important battery control module. Since BMU boards are typically required to be connected to a plurality of other circuit modules, Bus bars (Bus Bar) are required, and the BMU boards are connected to the Bus bars by soldering. However, in the prior art, manual positioning and welding are usually adopted when the two are welded, which has the problems of poor welding precision, low yield, low production efficiency and high labor intensity.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a high-precision welding device for a battery BMU plate, which aims at the problems in the prior art.

A high-precision welding device for BMU (BMU) plates of batteries comprises a rack, wherein a first Y-axis conveying mechanism is arranged on the rack, a first X-axis conveying mechanism is arranged on the first Y-axis conveying mechanism in a sliding manner, a first clamp and a BMU plate positioning mechanism are arranged on the first X-axis conveying mechanism in a sliding manner, the first clamp and the BMU plate positioning mechanism comprise a first clamp positioning mechanism and a first BMU plate positioning mechanism, a CCD (charge coupled device) detection mechanism is arranged above the middle part of the rack, and a pressing mechanism and a laser welding mechanism are arranged above the rear part of the rack; the first Y-axis conveying mechanism and the first X-axis conveying mechanism drive the first clamp and the BMU plate positioning mechanism to move along the Y direction and the X direction and convey the first clamp and the BMU plate positioning mechanism to the CCD detection mechanism and the laser welding mechanism.

In one embodiment, the first fixture positioning mechanism comprises a fixture carrying plate located on the first X-axis conveying mechanism, two wear-resistant strips are arranged on the fixture carrying plate at intervals along the Y-axis direction, two first limiting strips are arranged on one sides of the two wear-resistant strips, a limiting part is arranged between the two first limiting strips, a fixture positioning cylinder is arranged on one side of the limiting part, and an output shaft of the fixture positioning cylinder is connected with the limiting part; a photoelectric sensor is also arranged on one side of the first limiting strip; a second limiting strip is arranged on the other side of each of the two wear-resistant strips, and a height limiting block is arranged on each second limiting strip; the rear sides of the two wear-resistant strips are provided with rear limiting sliding blocks in a sliding manner along the Z-axis direction; the front side of the fixture bearing plate is provided with a notch between the two wear-resistant strips, and the lower side of the fixture bearing plate is provided with a turnover positioning mechanism which can be turned out from the notch to position the front side of the fixture.

In one embodiment, the first BMU board positioning mechanism comprises a vertical cylinder arranged on a fixture bearing plate, a horizontal fixing plate is connected to the lower side of an output shaft of the vertical cylinder, a push-pull cylinder is arranged at the lower part of the horizontal fixing plate, an output shaft of the push-pull cylinder is connected with a first vertical fixing plate, two ends of the first vertical fixing plate are respectively provided with a push-pull chuck, and the upper part of one side of each push-pull chuck is connected with the lower side of the horizontal fixing plate through a sliding rail and sliding block mechanism; two vertical baffle plates are arranged on one side of the horizontal fixing plate, a first limiting bolt is arranged between each vertical baffle plate and the other side of each push-pull chuck, and a first spring is sleeved on each first limiting bolt;

a second vertical fixing plate is fixed at the upper part of one side of the horizontal fixing plate, a clamping jaw air cylinder is fixed at one side of the second vertical fixing plate, two clamping jaws of the clamping jaw air cylinder are respectively connected with an inverted L-shaped supporting block, a second limiting bolt is arranged between one side of each inverted L-shaped supporting block, which is far away from the clamping jaw, and the second vertical fixing plate, and a second spring is sleeved on each second limiting bolt; the other end of each inverted L-shaped supporting block is connected with an inner clamping head;

the two push-pull chucks and the two inner chucks are arranged in parallel.

In one embodiment, the CCD detection mechanism includes a card reader for identifying the identity of the clamp and a CCD camera mechanism, the CCD camera mechanism includes a vertical moving structure, and a moving end of the vertical moving structure is provided with a CCD camera.

In one embodiment, the pressing mechanism comprises a pressing cylinder and a pressing head, the position of the pressing head corresponds to the position of the point to be welded, and the pressing head is provided with a welding hole and a smoke exhaust hole.

In one embodiment, the laser welding mechanism comprises a sensor conveying cylinder and a Z-axis conveying mechanism, an output shaft of the sensor conveying cylinder is connected with a height sensor, and a laser welding head is arranged on a moving end of the Z-axis conveying mechanism.

In one embodiment, the overturning positioning mechanism comprises an overturning cylinder, an output shaft of the overturning cylinder is connected with the bottom edge of the L-shaped connecting plate, two sliding rails are arranged on one side of the side edge of the L-shaped connecting plate in parallel, a connecting shaft is arranged between one ends of the two sliding rails, an overturning block rotatably connected with the two sliding rails is arranged between the other ends of the two sliding rails, the middle part of the overturning block is connected with the connecting shaft through a third spring, and the two sliding rails are respectively in sliding fit with a sliding block located below the fixture receiving plate.

In one embodiment, the position-limiting member is a structure with a roller.

In one embodiment, the high-precision welding equipment for the BMU board of the battery further comprises a second Y-axis conveying mechanism, the second Y-axis conveying mechanism and the first Y-axis conveying mechanism are arranged on the rack at intervals, a second X-axis conveying mechanism is arranged on the second Y-axis conveying mechanism in a sliding mode, and a second clamp and a BMU board positioning mechanism are arranged on the second X-axis conveying mechanism in a sliding mode; the second clamp and BMU plate positioning mechanism comprises a second clamp positioning mechanism and a second BMU plate positioning mechanism; the structure of the second clamp positioning mechanism is the same as that of the first clamp positioning mechanism, or the second clamp positioning mechanism and the first clamp positioning mechanism are arranged in a mirror image manner; the structure of the second BMU plate positioning mechanism and the first BMU plate positioning mechanism are arranged in a mirror image mode.

According to the high-precision welding equipment for the BMU plate of the battery, a first clamp and a BMU plate positioning mechanism are conveyed to a position for receiving the clamp through a first Y-axis conveying mechanism and a first X-axis conveying mechanism, the clamp is conveyed to the first clamp and the BMU plate positioning mechanism by an upper machine, the first clamp positioning mechanism is used for positioning and clamping the clamp, then the first BMU plate positioning mechanism is used for positioning the relative positions of the BMU plate and a to-be-welded part, after positioning is completed, the clamp is moved to a CCD detection mechanism through the first Y-axis conveying mechanism, the CCD detection mechanism is used for photographing the BMU plate and calculating the distance between the BMU plate and the to-be-welded part, the BMU plate is conveyed to the lower part of a laser welding mechanism, a pressing mechanism is used for pressing the welding point to-be-welded through the laser welding mechanism, and therefore the automatic high-precision welding process is completed; the automatic high-precision welding of the BMU plate is realized through the welding equipment, the yield is ensured, and the production efficiency is higher.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure of a high-precision welding device for a BMU plate of a battery of the present invention;

FIG. 2 is a schematic structural view of a first fixture with a fixture and a sample and a BMU plate positioning mechanism according to the present invention;

FIG. 3 is a schematic structural view of a first fixture positioning mechanism of the present invention;

fig. 4 is a schematic structural view of a first BMU board positioning mechanism in the present invention;

fig. 5 is a schematic structural view of the CCD detection mechanism and the laser welding mechanism of the present invention;

fig. 6 is a schematic structural view of the middle pressing mechanism of the present invention;

fig. 7 is a schematic structural view of the turning positioning mechanism of the present invention;

wherein, the frame 1, the first Y-axis transmission mechanism 2, the first X-axis transmission mechanism 3,

first jig positioning mechanism 4: the fixture comprises a fixture bearing plate 41, a wear-resistant strip 42, a first limiting strip 43, a limiting piece 44, a fixture positioning cylinder 45, a photoelectric sensor 46, a second limiting strip 47, a height limiting block 48, a rear limiting slide block 49 and a turnover positioning mechanism 40;

the device comprises a turnover cylinder 401, an L-shaped connecting plate 402, a sliding rail 403, a connecting shaft 404, a turnover block 405, a third spring 406 and a sliding block 407;

first BMU board positioning mechanism 5: a vertical cylinder 501, a horizontal fixing plate 502, a push-pull cylinder 503, a first vertical fixing plate 504, a push-pull chuck 505, a vertical baffle 506, a first limit bolt 507 and a first spring 508;

a second vertical fixing plate 511, a clamping jaw cylinder 512, an inverted-L-shaped supporting block 513, a second limiting bolt 514, a second spring 515 and an inner clamping head 516;

CCD detection mechanism 6: a card reader 61, a vertical moving structure 62 and a CCD camera 63;

pressing mechanism 7: a lower pressure cylinder 71, a lower pressure head 72 and a smoke exhaust hole 73;

the laser welding mechanism 8: a sensor transfer cylinder 81, a Z-axis transfer mechanism 82, a height sensor 83, a laser welding head 84;

a second Y-axis transfer mechanism 2 ', a second X-axis transfer mechanism 3', a second clamp positioning mechanism 4 ', and a second BMU plate positioning mechanism 5'.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The high precision welding apparatus for battery BMU boards of the present application is described in detail below with reference to FIGS. 1-7.

As shown in fig. 1, a high-precision welding device for a battery BMU plate comprises a frame 1, wherein a first Y-axis conveying mechanism 2 is arranged on the frame 1, a first X-axis conveying mechanism 3 is arranged on the first Y-axis conveying mechanism 2 in a sliding manner, a first clamp and a BMU plate positioning mechanism are arranged on the first X-axis conveying mechanism 3 in a sliding manner, the first clamp and the BMU plate positioning mechanism comprise a first clamp positioning mechanism 4 and a first BMU plate positioning mechanism 5, a CCD detection mechanism is arranged above the middle part of the frame 1, and a pressing mechanism 7 and a laser welding mechanism 8 are arranged above the rear part of the frame 1; the first Y-axis transfer mechanism 2 and the first X-axis transfer mechanism 3 drive the first jig and the BMU board positioning mechanism to move in the Y direction and the X direction, and transfer them to the CCD detection mechanism and the laser welding mechanism 8.

The first Y-axis transmission mechanism 2 and the first X-axis transmission mechanism 3 are common slide rail and slide block structures driven by a driving component or other common transmission modules, and can ensure the transmission precision of linear transmission. The fixture holds the BMU plate and the pieces to be welded, which may be, but not limited to, a Busbar plate, to be welded together. In one embodiment, the scorpion sample board shown in fig. 2 is a BMU board, the long board is a Busbar board, and the number of welding points is four, but the invention is not limited thereto.

Through the structure, the first Y-axis conveying mechanism 2 and the first X-axis conveying mechanism 3 convey the first fixture and the BMU plate positioning mechanism to the position of a bearing fixture, the upper machine conveys the fixture to the first fixture and the BMU plate positioning mechanism, the first fixture positioning mechanism 4 positions and clamps the fixture, then the first BMU plate positioning mechanism 5 positions the relative positions of the BMU plate and the workpiece to be welded, after the fixture is positioned, the first Y-axis conveying mechanism 2 moves the fixture to the CCD detection mechanism, the CCD detection mechanism photographs the fixture and calculates the distance between the fixture and the laser welding mechanism 8, then the fixture is conveyed to the position below the laser welding mechanism 8, the welding point is pressed through the pressing mechanism 7, the welding point position is welded through the laser welding mechanism 8, and therefore the automatic high-precision welding process is completed.

As shown in fig. 2, 3 and 4, for the sake of understanding, the first jig with the jig and the sample and the BMU plate positioning mechanism are constructed as shown in fig. 2; as shown in fig. 3, the first fixture positioning mechanism 4 includes a fixture receiving plate 41 located on the first X-axis conveying mechanism 3, two wear-resistant strips 42 are arranged on the fixture receiving plate 41 at intervals along the Y-axis direction, two first limiting strips 43 are arranged on one side of the two wear-resistant strips 42, a limiting member 44 is arranged in the middle of the two first limiting strips 43, a fixture positioning cylinder 45 is arranged on one side of the limiting member 44, and an output shaft of the fixture positioning cylinder 45 is connected with the limiting member 44; a photoelectric sensor 46 is arranged on one side of the first limiting strip 43; the other sides of the two wear-resistant strips 42 are provided with second limiting strips 47, and height limiting blocks 48 are arranged on the second limiting strips 47; the rear sides of the two wear-resistant strips 42 are provided with a rear limiting slide block 49 in a sliding manner along the Z-axis direction; a notch is arranged between the two wear-resistant strips 42 at the front side of the clamp bearing plate 41, and a turning positioning mechanism 40 which can be turned out from the notch to position the front side of the clamp is arranged at the lower side of the clamp bearing plate 41.

The first limiting strip 43, the limiting piece 44 and the second limiting strip 47 position two sides of the clamp, the overturning and positioning mechanism 40 positions the front side of the clamp, and the rear limiting slide block 49 positions the rear side of the clamp; the wear strips 42 are used to prevent the clamp from being scratched during movement. Preferably, the position-limiting member 44 is a structure with rollers, so that the friction force of the clamp during the positioning process can be reduced.

Through the above structure, during the specific positioning, the photoelectric sensor 46 (the detection line of the photoelectric sensor 46 is shown by a cylinder in fig. 2 and 3) detects whether a clamp is present at a specific position in the first clamp positioning mechanism 4, if it is detected that a clamp is present, the output shaft of the clamp positioning cylinder 45 pushes the limiting piece 44 in the X direction to clamp the clamp, and meanwhile, the overturning positioning mechanism 40 pushes the clamp from the front side through overturning, and the rear limiting slider 49 blocks the rear side of the clamp, so that the clamp is positioned.

Referring to fig. 3 and 7, the turning positioning mechanism 40 includes a turning cylinder 401, an output shaft of the turning cylinder 401 is connected to a bottom edge of the L-shaped connecting plate 402, two sliding rails 403 are arranged in parallel on one side of the side edge of the L-shaped connecting plate 402, a connecting shaft 404 is arranged between one ends of the two sliding rails 403, a turning block 405 rotatably connected to the two sliding rails 403 is arranged between the other ends of the two sliding rails 403, the middle portion of the turning block 405 is connected to the connecting shaft 404 through a third spring 406, and the two sliding rails 403 are respectively in sliding fit with a sliding block 407 located below the fixture receiving plate 41.

Through the structure setting, the output shaft through the turnover cylinder 401 stretches out to drive the L-shaped connecting plate 402 to move forwards, so that the two sliding rails are driven to move forwards, the third spring 406 is extended, the third spring 406 pulls the turnover block 405 to rotate towards the upper side of one side, and then the rotation of the turnover block 405 towards the other side is realized through the proper retraction of the output shaft of the turnover cylinder 401, so that the clamp of the clamp is realized.

As shown in fig. 4, the first BMU board positioning mechanism 5 includes a vertical cylinder 501 disposed on the fixture receiving plate 41, a horizontal fixing plate 502 is connected to a lower side of an output shaft of the vertical cylinder 501, a push-pull cylinder 503 is disposed at a lower portion of the horizontal fixing plate 502, an output shaft of the push-pull cylinder 503 is connected to a first vertical fixing plate 504, two ends of the first vertical fixing plate 504 are respectively provided with a push-pull collet 505, and an upper portion of one side of each push-pull collet 505 is connected to a lower side of the horizontal fixing plate 502 through a slide rail slider mechanism (not shown); two vertical baffles 506 are arranged on one side of the horizontal fixing plate 502, a first limiting bolt 507 is arranged between each vertical baffle 506 and the other side of each push-pull chuck 505, and a first spring 508 is sleeved on each first limiting bolt 507;

a second vertical fixing plate 511 is fixed at the upper part of one side of the horizontal fixing plate 502, a clamping jaw air cylinder 512 is fixed at one side of the second vertical fixing plate 511, two clamping jaws of the clamping jaw air cylinder 512 are respectively connected with an inverted-L-shaped supporting block 513, a second limiting bolt 514 is arranged between one side of each inverted-L-shaped supporting block 513, which is far away from the clamping jaw, and the second vertical fixing plate 511, and a second spring 515 is sleeved on each second limiting bolt 514; the other end of each inverted-L-shaped supporting block 513 is connected with an inner clamping head 516;

the two push-pull clamps 505 are arranged parallel to the two inner clamp clamps 516.

Through the structural arrangement, the first BMU plate positioning mechanism 5 is an elastic force applying structure, and when the first BMU plate positioning mechanism is specifically positioned, the output shaft of the vertical cylinder 501 moves downwards to be close to the clamp; the clamping jaw air cylinder 512 clamps, so that two inner clamping heads 516 are driven to clamp the BMU board through elastic force; meanwhile, the output shaft of the push-pull cylinder 503 extends out, so as to drive the push-pull chuck 505 to pull the part to be welded to one side through elastic force, thereby realizing the positioning of the BMU plate and the part to be welded.

As shown in fig. 5, the CCD detection mechanism includes a card reader 61 for identifying the identity of the clamp and a CCD camera mechanism, the CCD camera mechanism includes a vertical moving structure 62, and a CCD camera 63 is disposed on a moving end of the vertical moving structure 62.

The card reader 61 is used for identifying the identity of the clamp, and the vertical moving structure 62 drives the CCD camera 63 to move up and down, so that accurate focusing of the CCD camera 63 is achieved. After the CCD camera 63 takes a picture, the distance between the positions of the welding heads of the clamp and the laser welding mechanism 8 is calculated, so that the first Y-axis conveying mechanism 2 can convey the welding heads conveniently.

As shown in fig. 6, the pressing mechanism 7 includes a pressing cylinder 71 and a pressing head 72, the position of the pressing head 72 corresponds to the position of the welding point, and the pressing head 72 is provided with a welding hole and a smoke discharge hole 73.

Here, in order to prevent the lower press head 72 from damaging the welding point, the pressing mechanism 7 may be provided with an elastic force applying structure similar to the first BMU board positioning mechanism 5, which will not be described in detail herein. An output shaft of the pressing cylinder 71 moves downwards to drive the pressing head 72 to move downwards, so that pressing of the welding point is achieved; the welding hole is used for enabling laser to penetrate through the lower pressure head 72 to weld a to-be-welded point; by arranging the smoke discharge hole 73, smoke can be discharged, and the laser welding is prevented from being influenced.

As shown in fig. 5, the laser welding mechanism 8 includes a sensor transmission cylinder 81 and a Z-axis transmission mechanism 82, an output shaft of the sensor transmission cylinder 81 is connected to a height sensor 83, and a moving end of the Z-axis transmission mechanism 82 is provided with a laser welding head 84.

The height sensor 83 (the detection line of the height sensor 83 is shown by a cylinder in fig. 5) may be any distance-measuring sensor, and is used for extending to the fixture to detect the height of the point to be welded therein, and feeding back to the laser welding head 84 (the irradiation range of the laser welding head 84 is shown by a quadrangular frustum in fig. 5), so that the laser welding head 84 moves to a proper height to realize accurate welding. After welding, the first clamp and the BMU plate positioning mechanism release clamping of the clamp, and the next machine takes the clamp away from the high-precision welding equipment for the BMU plate of the battery.

In addition, as another preferred embodiment, as shown in fig. 1, the high-precision welding apparatus for battery BMU boards further includes a second Y-axis transmission mechanism 2 ', a second Y-axis transmission mechanism 2 ' and the first Y-axis transmission mechanism 2 are arranged on the rack 1 at intervals, a second X-axis transmission mechanism 3 ' is arranged on the second Y-axis transmission mechanism 2 ' in a sliding manner, and a second clamp and a BMU board positioning mechanism are arranged on the second X-axis transmission mechanism 3 ' in a sliding manner; the second clamp and BMU plate positioning mechanism comprises a second clamp positioning mechanism 4 'and a second BMU plate positioning mechanism 5'; the structure of the second clamp positioning mechanism 4' is the same as that of the first clamp positioning mechanism 4, or the second clamp positioning mechanism 4 is arranged in a mirror image manner; the second BMU plate positioning mechanism 5' is arranged in a mirror image mode with the first BMU plate positioning mechanism 5.

Therefore, through the arrangement of the two sets of Y-axis conveying mechanisms, the X-axis conveying mechanism, the clamp and the BMU plate positioning mechanism, the clamp can be alternately conveyed by the two sets of mechanisms, and the working efficiency is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a battery BMU board high accuracy welding equipment which characterized in that: the automatic detection device comprises a rack, wherein a first Y-axis conveying mechanism is arranged on the rack, a first X-axis conveying mechanism is arranged on the first Y-axis conveying mechanism in a sliding manner, a first clamp and a BMU (BMU) plate positioning mechanism are arranged on the first X-axis conveying mechanism in a sliding manner, the first clamp and the BMU plate positioning mechanism comprise a first clamp positioning mechanism and a first BMU plate positioning mechanism, a CCD (charge coupled device) detection mechanism is arranged above the middle part of the rack, and a pressing mechanism and a laser welding mechanism are arranged above the rear part of the rack; the first Y-axis conveying mechanism and the first X-axis conveying mechanism drive the first clamp and the BMU plate positioning mechanism to move along the Y direction and the X direction and convey the first clamp and the BMU plate positioning mechanism to the CCD detection mechanism and the laser welding mechanism.

2. The battery BMU board high precision welding apparatus of claim 1, wherein: the first fixture positioning mechanism comprises a fixture carrying plate positioned on the first X-axis conveying mechanism, two wear-resistant strips are arranged on the fixture carrying plate at intervals along the Y-axis direction, two first limiting strips are arranged on one sides of the two wear-resistant strips, a limiting part is arranged between the two first limiting strips, a fixture positioning cylinder is arranged on one side of the limiting part, and an output shaft of the fixture positioning cylinder is connected with the limiting part; a photoelectric sensor is also arranged on one side of the first limiting strip; a second limiting strip is arranged on the other side of the two wear-resistant strips, and a height limiting block is arranged on the second limiting strip; the rear sides of the two wear-resistant strips are provided with rear limiting sliding blocks in a sliding manner along the Z-axis direction; the front side of the fixture bearing plate is provided with a notch between the two wear-resistant strips, and the lower side of the fixture bearing plate is provided with a turnover positioning mechanism which can be turned out from the notch to position the front side of the fixture.

3. The battery BMU board high precision welding apparatus of claim 2, wherein: the first BMU board positioning mechanism comprises a vertical cylinder arranged on a fixture bearing plate, a horizontal fixing plate is connected to the lower side of an output shaft of the vertical cylinder, a push-pull cylinder is arranged on the lower portion of the horizontal fixing plate, the output shaft of the push-pull cylinder is connected with a first vertical fixing plate, two ends of the first vertical fixing plate are respectively provided with a push-pull chuck, and the upper portion of one side of each push-pull chuck is connected with the lower side of the horizontal fixing plate through a sliding rail and sliding block mechanism; two vertical baffle plates are arranged on one side of the horizontal fixing plate, a first limiting bolt is arranged between each vertical baffle plate and the other side of each push-pull chuck, and a first spring is sleeved on each first limiting bolt;

the two push-pull chucks are arranged in parallel with the two inner chucks.

4. The battery BMU board high precision welding apparatus of claim 1, wherein: the CCD detection mechanism comprises a card reader for identifying the identity of the clamp and a CCD camera shooting mechanism, the CCD camera shooting mechanism comprises a vertical moving structure, and a CCD camera is arranged on a moving end of the vertical moving structure.

5. The battery BMU board high precision welding apparatus of claim 1, wherein: the pressing mechanism comprises a pressing cylinder and a pressing head, the position of the pressing head corresponds to the position of the welding point to be treated, and a welding hole and a smoke exhaust hole are formed in the pressing head.

6. The battery BMU board high precision welding apparatus of claim 1, wherein: the laser welding mechanism comprises a sensor conveying cylinder and a Z-axis conveying mechanism, an output shaft of the sensor conveying cylinder is connected with a height sensor, and a laser welding head is arranged at the moving end of the Z-axis conveying mechanism.

7. The battery BMU board high precision welding apparatus of claim 2, wherein: the overturning positioning mechanism comprises an overturning cylinder, an output shaft of the overturning cylinder is connected with the bottom edge of the L-shaped connecting plate, two sliding rails are arranged on one side of the side edge of the L-shaped connecting plate in parallel, a connecting shaft is arranged between one ends of the two sliding rails, an overturning block which is connected with the two sliding rails in a rotating mode is arranged between the other ends of the two sliding rails, the middle of the overturning block is connected with the connecting shaft through a third spring, and the two sliding rails are respectively matched with sliding blocks, located below the fixture bearing plate, in a sliding mode.

8. The battery BMU board high precision welding apparatus of claim 2, wherein: the limiting part is of a structure with a roller.

9. The battery BMU board high precision welding apparatus of claim 1, 2, or 3, wherein: the high-precision welding equipment for the BMU plate of the battery further comprises a second Y-axis conveying mechanism, the second Y-axis conveying mechanism and the first Y-axis conveying mechanism are arranged on the rack at intervals, a second X-axis conveying mechanism is arranged on the second Y-axis conveying mechanism in a sliding mode, and a second clamp and a BMU plate positioning mechanism are arranged on the second X-axis conveying mechanism in a sliding mode; the second clamp and BMU plate positioning mechanism comprises a second clamp positioning mechanism and a second BMU plate positioning mechanism; the structure of the second clamp positioning mechanism is the same as that of the first clamp positioning mechanism, or the second clamp positioning mechanism and the first clamp positioning mechanism are arranged in a mirror image manner; the structure of the second BMU plate positioning mechanism and the first BMU plate positioning mechanism are arranged in a mirror image mode.