A welding fixture for battery pack crossbeams

Abstract

This utility model discloses a welding fixture for a battery pack crossbeam, comprising a fixture base plate, a crossbeam support seat, and a screw sleeve positioning mechanism. The crossbeam support seat, located on the fixture base plate, is used to place the battery pack crossbeam and consists of a support column, a left stop block, a right stop block, a support crossbeam, and a crossbeam support block. The support column stands vertically on the fixture base plate. One end of the support crossbeam is connected to the side surface of the support column, the other end to the left stop block, and the middle is connected to the crossbeam support block. The right stop block stands vertically on the side surface of the support column and is above the support crossbeam. The screw sleeve positioning mechanism includes a first welding clamping cylinder, a positioning column, etc. The first cylinder clamping arm of the first welding clamping cylinder is connected to the positioning column, and the lower end of the positioning column presses the screw sleeve to fix it to the vertical profile rib plate. A first support is located on the fixture base plate, and its rib plate support block is located below and in contact with the rib plate. Through the above configuration, the overall fixing of the battery pack crossbeam can be achieved, ensuring welding accuracy.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, specifically to a welding fixture for a battery pack crossbeam. Background Technology

[0002] In the manufacturing of new energy vehicles, the battery pack, as a core power component, is crucial for structural stability. The battery pack crossbeam, as a key supporting structure, plays a vital role in bearing the battery modules, transmitting loads, and ensuring the overall rigidity of the battery pack. In existing technologies, operators need to weld each component individually to the crossbeam. This welding process requires frequent positioning and adjustment of the components, consuming significant manpower and time. Furthermore, due to the subjectivity and uncertainty of manual operation, it is difficult to ensure consistency in the welding position and parameters of each component, resulting in low welding efficiency and inconsistent welding quality. Utility Model Content

[0003] In view of this, the present invention discloses a welding fixture for a battery pack crossbeam, the specific solution of which is as follows:

[0004] A welding fixture for a battery pack crossbeam is provided for welding a battery pack crossbeam. The battery pack crossbeam includes a horizontal profile, a vertical profile, and a cover plate. The vertical profile is located at the upper end of the horizontal profile. A groove is provided in the middle of the horizontal profile. The cover plate is located at the groove position in the middle of the horizontal profile. Rib portions are provided on the side surfaces of the vertical profile, and threaded sleeves are provided on the rib portions. The welding fixture for the battery pack crossbeam includes a fixture base plate, a crossbeam support seat, and a threaded sleeve positioning mechanism.

[0005] The crossbeam support is mounted on the tooling base plate, and the battery pack crossbeam is mounted on the crossbeam support. The crossbeam support includes a support column, a left stop block, a right stop block, a support crossbeam, and a crossbeam support block. The support column is vertically mounted on the tooling base plate. One end of the support crossbeam is connected to the side surface of the support column, and the other end of the support crossbeam is connected to a vertically mounted left stop block. The middle part of the support crossbeam is connected to a crossbeam support block, and the right stop block is vertically mounted on the side surface of the support column and located above the support crossbeam.

[0006] The threaded sleeve positioning mechanism includes a first welding clamping cylinder, a positioning column, a column connecting block, a first support, and a stiffener support block. The first welding clamping cylinder is equipped with a first cylinder clamping arm. The positioning column is connected to the first cylinder clamping arm through the column connecting block. The positioning column is located above the threaded sleeve and is used to apply vertical clamping force to the threaded sleeve to fix it to the stiffener portion of the vertical profile. The first support is set on the tooling base plate, and the stiffener support block is set on the first support and located on the lower side of the stiffener portion. The upper end of the stiffener support block contacts the stiffener portion.

[0007] As a supplement to the technical solution of this utility model, adjusting shims are provided between the right stop block and the supporting column, and between the crossbeam support block and the supporting crossbeam.

[0008] As a supplement to the technical solution of this utility model, the screw sleeve positioning mechanism further includes a positioning support block and a positioning limit block;

[0009] The positioning support block is located at the upper end of the first support, the positioning limit block is located at the lower part of the column connecting block, and the positioning limit block is located above the positioning support block. When the first welding clamping cylinder drives the first cylinder clamping arm to rotate so that the lower end of the positioning column contacts the threaded sleeve, the positioning limit block contacts the positioning support block.

[0010] As a supplement to the technical solution of this utility model, it also includes an end positioning mechanism, which includes a front limiting column, a rear positioning column, and a first positioning cylinder.

[0011] The front limiting column is set on the tooling base plate and on the front side of the battery pack crossbeam. The first positioning cylinder is set on the tooling base plate. The end of the piston rod of the first positioning cylinder is connected to the rear positioning column. The rear positioning column is located on the rear side of the battery pack crossbeam. The first positioning cylinder can push the rear positioning column to cooperate with the front limiting column to clamp the battery pack crossbeam.

[0012] As a supplement to the technical solution of this utility model, it also includes a side limiting mechanism for the crossbeam, which includes a first side limiting cylinder and a first side limiting block;

[0013] The first side limiting cylinder is mounted on the tooling base plate, and the first side limiting block is mounted on the piston rod of the first side limiting cylinder. The first side limiting cylinder can push the first side limiting block to cooperate with the right stop block of the crossbeam support to clamp the battery pack crossbeam.

[0014] As a supplement to the technical solution of this utility model, it also includes a vertical limiting mechanism for the crossbeam, which includes a second welding clamping cylinder and a vertical limiting block;

[0015] The second welding clamping cylinder is equipped with a second cylinder clamping arm, and a vertical limiting block is connected to the second cylinder clamping arm. The vertical limiting block can be driven by the second welding clamping cylinder to rotate, so as to apply downward pressure to the battery pack crossbeam.

[0016] As a supplement to the technical solution of this utility model, it also includes a cover plate lateral limiting mechanism, which includes a second side limiting cylinder, a limiting push plate, and a cover plate limiting column.

[0017] The second side limiting cylinder is mounted on the tooling base plate and located below the battery pack crossbeam. The limiting push plate is connected to the piston rod of the second side limiting cylinder. The cover plate limiting column is vertically mounted on the limiting push plate. The upper end of the cover plate limiting column is provided with a column protrusion. The upper part of the column protrusion abuts against the cover plate side edge of the battery pack crossbeam, and the lower part of the column protrusion abuts against the transverse profile side edge of the battery pack crossbeam.

[0018] As a supplement to the technical solution of this utility model, it also includes a vertical limiting mechanism for the cover plate, which includes a third welding clamping cylinder, a clamping arm, and a positioning pin.

[0019] The third welding clamping cylinder is equipped with a third cylinder clamping arm, and a pressing arm is set on the third cylinder clamping arm. The third cylinder clamping arm can be driven by the third welding clamping cylinder to rotate, thereby driving the pressing arm to apply a vertical pressing force to the cover plate of the battery pack crossbeam.

[0020] The positioning pin is set on the clamping arm. When the clamping arm contacts the upper surface of the cover plate, the positioning pin is inserted into the through hole opened on the cover plate.

[0021] Beneficial effects: The battery pack crossbeam welding fixture disclosed in this utility model supports the lower side of the rib plate portion through the rib plate support block of the screw sleeve positioning mechanism, offsetting the downward pressure of the positioning column on the screw sleeve and preventing the rib plate portion from bending downward due to welding heat input; the positioning limit block cooperates with the positioning support block to control the downward pressure through mechanical limit, avoiding excessive pressure that could cause deformation, and ensuring the coaxiality of the through hole and the screw sleeve welding. In another aspect of this utility model, the setting of end positioning mechanism, crossbeam support seat and other structures can realize multi-dimensional positioning of the battery pack crossbeam and cover plate, preventing the technical problem of uneven heating of the battery pack crossbeam during welding and warping. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 3 This is a schematic diagram of the screw sleeve positioning mechanism of this utility model.

[0025] Figure 4 This is a schematic diagram of the crossbeam support structure of this utility model.

[0026] Figure 5 This is a schematic diagram of the end positioning mechanism of this utility model.

[0027] Figure 6 This is a schematic diagram of the side limiting mechanism of the crossbeam of this utility model.

[0028] Figure 7 This is a schematic diagram of the vertical limiting mechanism for the crossbeam of this utility model.

[0029] Figure 8 This is a schematic diagram of the lateral limiting mechanism of the cover plate of this utility model.

[0030] Figure 9 This is a schematic diagram of the vertical limiting mechanism of the cover plate of this utility model.

[0031] Figure 10 This is a schematic diagram of the crossbeam structure of the battery pack of this utility model.

[0032] Figure 11 This is a schematic diagram of the crossbeam structure of the battery pack of this utility model.

[0033] In the diagram: 100. Tooling base plate;

[0034] 200. Horizontal beam support seat; 201. Support column; 202. Left stop block; 203. Right stop block; 204. Supporting horizontal beam; 205. Horizontal beam support block;

[0035] 300. Screw sleeve positioning mechanism; 301. First welding clamping cylinder; 302. Positioning column; 303. Column connecting block; 304. First support; 305. Rib plate support block; 306. First cylinder clamping arm; 307. Positioning support block; 308. Positioning limit block;

[0036] 400. End positioning mechanism; 401. Front limit column; 402. Rear positioning column; 403. First positioning cylinder;

[0037] 500. Side limiting mechanism for crossbeam; 501. First side limiting cylinder; 502. First side limiting block;

[0038] 600. Vertical limiting mechanism for the crossbeam; 601. Second welding clamping cylinder; 602. Vertical limiting block; 603. Second cylinder clamping arm;

[0039] 700. Lateral limiting mechanism for cover plate; 701. Second side limiting cylinder; 702. Limiting push plate; 703. Cover plate limiting column; 704. Column protrusion;

[0040] 800. Cover plate vertical limiting mechanism; 801. Third welding clamping cylinder; 802. Clamping arm; 803. Positioning pin; 804. Third cylinder clamping arm;

[0041] 900. Battery pack crossbeam, 901. Horizontal profile, 902. Vertical profile, 903. Cover plate, 904. Screw sleeve, 905. Rib plate. Detailed Implementation

[0042] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] A welding fixture for a battery pack crossbeam is provided for clamping and fixing the battery pack crossbeam 900. For example... Figure 10 , Figure 11 As shown, the battery pack crossbeam 900 includes a horizontal profile 901 and a vertical profile 902. The vertical profile 902 is located at the upper end of the horizontal profile 901, and the horizontal profile 901 and the vertical profile 902 are spliced ​​together to form an L-shaped structure. A groove is provided in the middle of the horizontal profile 901, and a cover plate 903 needs to be welded to the groove in the middle of the horizontal profile 901. A raised rib portion 905 is provided on the back of the vertical profile 902, and a through hole is provided on the rib portion 905. A threaded sleeve 904 needs to be welded into this through hole.

[0045] The battery pack crossbeam welding fixture disclosed in this utility model includes a fixture base plate 100, a crossbeam support seat 200, and a screw sleeve positioning mechanism 300.

[0046] like Figures 1 to 4 As shown, the beam support 200 and the end positioning mechanism 400 are both mounted on the tooling base plate 100. The beam support 200 is used to support the beam, and the end positioning mechanism 400 is used to further position the beam.

[0047] The crossbeam support 200 includes a support column 201, a left stop block 202, a right stop block 203, a support crossbeam 204, and a crossbeam support block 205.

[0048] A support column 201 is vertically mounted on the tooling base plate 100. One end of a support beam 204 is connected to the side surface of the support column 201, and the other end of the support beam 204 is connected to a vertically mounted left stop block 202. A beam support block 205 is connected to the middle of the support beam 204. The right stop block 203 is vertically mounted on the side surface of the support column 201 and located above the support beam 204. A battery pack beam 900 is placed on the beam support block 205. The left stop block 202 is used to limit the left end of the battery pack beam 900, and the right stop block 203 is used to limit the right end of the battery pack beam 900.

[0049] The threaded sleeve positioning mechanism 300 includes a first welding clamping cylinder 301, a positioning column 302, a column connecting block 303, a first support 304, and a stiffener plate support block 305.

[0050] The first welding clamping cylinder 301 is equipped with a first cylinder clamping arm 306. The positioning column 302 is connected to the first cylinder clamping arm 306 through a column connecting block 303. By rotating the first cylinder clamping arm 306, the lower end of the positioning column 302 applies a clamping force to the threaded sleeve 904, fixing the threaded sleeve 904 to the rib plate portion 905 of the vertical profile 902. The first support 304 is set on the tooling base plate 100, and the rib plate support block 305 is set on the lower side of the rib plate portion 905, with its upper end in contact with the rib plate portion 905. The rib plate support block 305 supports the rib plate portion 905, preventing the positioning column 302 from applying excessive downward pressure to the threaded sleeve 904, which could cause the rib plate portion 905 to deform downwards due to heat during welding.

[0051] The first welding clamping cylinder 301 can rotate the first cylinder clamping arm 306.

[0052] As a supplement to the above technical solution, the threaded sleeve positioning mechanism 300 also includes a first sensor. The first sensor is disposed on the first support 304 and located below the stiffener support block 305. The stiffener support block 305 has a vertical through hole. The first sensor can detect whether the threaded sleeve 904 is welded to the stiffener part 905 through the vertical through hole on the stiffener support block 305. After welding, the threaded sleeve 904 is detected to prevent the technical problem of incomplete welding.

[0053] As a supplement to the above technical solution, adjusting shims are provided between the right stop block 203 and the support column 201, and between the crossbeam support block 205 and the support crossbeam 204. By adjusting the shims, the positions of the crossbeam support block 205 and the right stop block 203 can be adjusted so that they can support the crossbeams 900 of battery packs of different sizes and specifications.

[0054] As a supplement to the above technical solution, the screw sleeve positioning mechanism 300 also includes a positioning support block 307 and a positioning limit block 308.

[0055] The positioning support block 307 is disposed at the upper end of the first support 304, and the positioning limit block 308 is located at the lower part of the column connecting block 303. The positioning limit block 308 is located above the positioning support block 307, so that when the first welding clamping cylinder 301 drives the first cylinder clamping arm 306 to rotate, the positioning limit block 308 can rotate downward accordingly. When the positioning limit block 308 rotates to the position of the positioning support block 307, the positioning support block 307 stops the rotation of the positioning limit block 308, preventing the positioning column 302 from applying too much downward pressure to the threaded sleeve 904, which would cause the stiffening plate 905 to deform under stress.

[0056] As a supplement to the above technical solutions, such as Figure 5 As shown, it also includes an end positioning mechanism 400, which includes a front limiting column 401, a rear positioning column 402, and a first positioning cylinder 403.

[0057] The front limiting column 401 is mounted on the tooling base plate 100 and located on the front side of the battery pack crossbeam 900. The first positioning cylinder 403 is mounted on the tooling base plate 100, and the end of the piston rod of the first positioning cylinder 403 is connected to the rear positioning column 402, which is located on the rear side of the battery pack crossbeam 900. When fixing the battery pack crossbeam 900, the first positioning cylinder 403 is activated, causing the rear positioning column 402 to push the battery pack crossbeam 900 to move forward along the limiting column 401, so that the front limiting column 401 and the rear positioning column 402 cooperate to clamp and fix the battery pack crossbeam 900 in the length direction.

[0058] As a preferred technical solution of this utility model, such as Figure 6 As shown, it also includes a side limiting mechanism 500 for the crossbeam, which includes a first side limiting cylinder 501 and a first side limiting block 502.

[0059] The first side limiting cylinder 501 is mounted on the tooling base plate 100, and the first side limiting block 502 is mounted on the piston rod of the first side limiting cylinder 501. After the battery pack crossbeam 900 is placed on the crossbeam support seat 200, the first side limiting cylinder 501 drives the first side limiting block 502 to press against the battery pack crossbeam 900. This, together with the right stop block 203 of the crossbeam support seat 200, clamps the battery pack crossbeam 900, preventing the technical problem of inaccurate positioning caused by the distance between the left stop block 202 and the right stop block 203 of the crossbeam support seat 200 being greater than the width of the battery pack crossbeam 900.

[0060] As a preferred technical solution of this utility model, such as Figure 7As shown, it also includes a horizontal beam vertical limiting mechanism 600, which includes a second welding clamping cylinder 601 and a vertical limiting block 602.

[0061] The second welding clamping cylinder 601 is equipped with a second cylinder clamping arm 603, which can drive the second cylinder clamping arm 603 to rotate. The vertical limiting block 602 is connected to the second cylinder clamping arm 603. The second welding clamping cylinder 601 drives the second cylinder clamping arm 603 to drive the vertical limiting block 602 to apply downward pressure to the upper end of the battery pack crossbeam 900, thereby further fixing the battery pack crossbeam 900.

[0062] As a preferred technical solution of this utility model, such as Figure 8 As shown, it also includes a cover plate lateral limiting mechanism 700, which includes a second side limiting cylinder 701, a limiting push plate 702, and a cover plate limiting column 703. The second side limiting cylinder 701 is disposed on the tooling base plate 100 and located below the battery pack crossbeam 900. The limiting push plate 702 is connected to the piston rod of the second side limiting cylinder 701. The cover plate limiting column 703 is vertically disposed on the limiting push plate 702. There are two sets of cover plate limiting columns 703. The upper end of the cover plate limiting column 703 is provided with a column protrusion 704. The upper part of the column protrusion 704 contacts the side edge of the cover plate 903, and the lower part of the column protrusion 704 contacts the side edge of the lateral profile 901. With the above settings, when the cover plate 903 needs to be initially positioned, the second side limiting cylinder 701 drives the limiting push plate 702 to move the cover plate limiting column 703 toward the cover plate 903, so that the column protrusion 704 contacts the side edge of the cover plate 903 and the transverse profile 901, making the cover plate 903 flush with the side edge of the transverse profile 901, thus completing the initial positioning of the cover plate 903.

[0063] As a supplement to the above technical solutions, such as Figure 9 As shown, it also includes a cover plate vertical limiting mechanism 800, which includes a third welding clamping cylinder 801, a clamping arm 802, and a positioning pin 803.

[0064] The third welding clamping cylinder 801 is equipped with a third cylinder clamping arm 804, which can be driven to rotate. A pressing arm 802 is mounted on the third cylinder clamping arm 804. When the third welding clamping cylinder 801 drives the third cylinder clamping arm 804 to rotate, the pressing arm 802 applies a vertically downward pressing force to the cover plate 903. A positioning pin 803 is mounted on the pressing arm 802. When the pressing arm 802 contacts the upper surface of the cover plate 903, the positioning pin 803 inserts into a through hole in the cover plate 903, further limiting the position of the cover plate 903.

[0065] By setting up the cover plate vertical limiting mechanism 800 and the cover plate horizontal limiting mechanism 700, the cover plate 903 can be accurately positioned, ensuring that the cover plate 903 can be welded to the horizontal profile 901 with high precision.

[0066] As a supplement to the above technical solution, the cover plate vertical limiting mechanism 800 also includes a second sensor, which is disposed on the clamping arm 802 and is used to monitor whether the cover plate 903 is leaking weld.

[0067] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be included within the protection scope of the present invention.

Claims

1. A welding fixture for a battery pack crossbeam, used for welding a battery pack crossbeam (900), the battery pack crossbeam (900) including a transverse profile (901), a vertical profile (902), and a cover plate (903), the vertical profile (902) being disposed at the upper end of the transverse profile (901), the transverse profile (901) having a groove in the middle, the cover plate (903) being disposed at the groove in the middle of the transverse profile (901), the side surface of the vertical profile (902) having a stiffener portion (905), and a threaded sleeve (904) being disposed on the stiffener portion (905); Its features are, The welding fixture for the battery pack crossbeam includes a fixture base plate (100), a crossbeam support seat (200), and a screw sleeve positioning mechanism (300). The crossbeam support base (200) is set on the tooling base plate (100), and the battery pack crossbeam (900) is set on the crossbeam support base (200). The crossbeam support base (200) includes a support column (201), a left stop block (202), a right stop block (203), a support crossbeam (204), and a crossbeam support block (205). The support column (201) is vertically set on the tooling base plate (100). One end of the support crossbeam (204) is connected to the side surface of the support column (201), and the other end of the support crossbeam (204) is connected to the vertically set left stop block (202). The middle part of the support crossbeam (204) is connected to the crossbeam support block (205). The right stop block (203) is vertically set on the side surface of the support column (201) and located above the support crossbeam (204). The threaded sleeve positioning mechanism (300) includes a first welding clamping cylinder (301), a positioning column (302), a column connecting block (303), a first support (304), and a rib support block (305); the first welding clamping cylinder (301) is provided with a first cylinder clamping arm (306), and the positioning column (302) is connected to the first cylinder clamping arm (306) through the column connecting block (303). Above the threaded sleeve (904), a vertical clamping force is applied to the threaded sleeve (904) to fix the threaded sleeve (904) to the rib plate portion (905) of the vertical profile (902); the first support (304) is set on the tooling base plate (100), the rib plate support block (305) is set on the first support (304) and located on the lower side of the rib plate portion (905), and the upper end of the rib plate support block (305) contacts the rib plate portion (905).

2. The battery pack crossbeam welding fixture according to claim 1, characterized in that, Adjusting shims are provided between the right stop block (203) and the support column (201), and between the crossbeam support block (205) and the support crossbeam (204).

3. The battery pack crossbeam welding fixture according to claim 1, characterized in that, The screw sleeve positioning mechanism (300) also includes a positioning support block (307) and a positioning limit block (308); The positioning support block (307) is located at the upper end of the first support (304), the positioning limit block (308) is located at the lower part of the column connecting block (303), and the positioning limit block (308) is located above the positioning support block (307). When the first welding clamping cylinder (301) drives the first cylinder clamping arm (306) to rotate so that the lower end of the positioning column (302) contacts the threaded sleeve (904), the positioning limit block (308) contacts the positioning support block (307).

4. The battery pack crossbeam welding fixture according to claim 1, characterized in that, It also includes an end positioning mechanism (400), which includes a front limiting column (401), a rear positioning column (402), and a first positioning cylinder (403). The front limiting column (401) is set on the tooling base plate (100) and on the front side of the battery pack crossbeam (900). The first positioning cylinder (403) is set on the tooling base plate (100). The end of the piston rod of the first positioning cylinder (403) is connected to the rear positioning column (402). The rear positioning column (402) is located on the rear side of the battery pack crossbeam (900). The first positioning cylinder (403) can push the rear positioning column (402) to cooperate with the front limiting column (401) to clamp the battery pack crossbeam (900).

5. The battery pack crossbeam welding fixture according to claim 1, characterized in that, It also includes a beam side limiting mechanism (500), which includes a first side limiting cylinder (501) and a first side limiting block (502); The first side limiting cylinder (501) is mounted on the tooling base plate (100), and the first side limiting block (502) is mounted on the piston rod of the first side limiting cylinder (501). The first side limiting cylinder (501) can push the first side limiting block (502) to cooperate with the right stop block (203) of the crossbeam support (200) to clamp the battery pack crossbeam (900).

6. The battery pack crossbeam welding fixture according to claim 1, characterized in that, It also includes a beam vertical limiting mechanism (600), which includes a second welding clamping cylinder (601) and a vertical limiting block (602); The second welding clamping cylinder (601) is provided with a second cylinder clamping arm (603), and a vertical limiting block (602) is connected to the second cylinder clamping arm (603). The vertical limiting block (602) can be driven by the second welding clamping cylinder (601) to flip over, so as to apply downward pressure to the battery pack beam (900).

7. The battery pack crossbeam welding fixture according to claim 1, characterized in that, It also includes a cover plate lateral limiting mechanism (700), which includes a second side limiting cylinder (701), a limiting push plate (702), and a cover plate limiting column (703). The second side limiting cylinder (701) is set on the tooling base plate (100) and located below the battery pack crossbeam (900). The limiting push plate (702) is connected to the piston rod of the second side limiting cylinder (701). The cover plate limiting column (703) is vertically set on the limiting push plate (702). The upper end of the cover plate limiting column (703) is provided with a column protrusion (704). The upper part of the column protrusion (704) abuts against the side edge of the cover plate (903) of the battery pack crossbeam (900), and the lower part of the column protrusion (704) abuts against the side edge of the transverse profile (901) of the battery pack crossbeam (900).

8. The battery pack crossbeam welding fixture according to claim 1, characterized in that, It also includes a cover plate vertical limiting mechanism (800), which includes a third welding clamping cylinder (801), a clamping arm (802), and a positioning pin (803); The third welding clamping cylinder (801) is provided with a third cylinder clamping arm (804), and a pressing arm (802) is provided on the third cylinder clamping arm (804). The third cylinder clamping arm (804) can be driven by the third welding clamping cylinder (801) to rotate, thereby driving the pressing arm (802) to apply a vertical pressing force to the cover plate (903) of the battery pack crossbeam (900). The positioning pin (803) is set on the clamping arm (802). When the clamping arm (802) contacts the upper end face of the cover plate (903), the positioning pin (803) is inserted into the through hole opened on the cover plate (903).

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