An efficient positioning welding tooling for the lower tray of a battery box and its welding process

Abstract

The present invention relates to the technical field of welding of the lower tray of a battery box, and specifically discloses a welding tooling for the lower tray of a battery box with high-efficiency positioning, which includes an intermediate positioning mechanism, a left-end positioning mechanism and a right-end positioning mechanism arranged at the left and right ends of the intermediate positioning mechanism. The intermediate positioning mechanism includes an intermediate positioning seat assembly, an intermediate fixed clamping assembly and a docking driving assembly. The left-end positioning mechanism includes a left-end positioning seat assembly and a left-end fixed clamping assembly. The right-end positioning mechanism includes a right-end positioning seat assembly and an end fixed clamping assembly. In the present invention, after placing the intermediate frame, the left-end splicing part and the right-end splicing part that make up the lower tray of the battery box, synchronous splicing is carried out by starting the driving cylinder II, reducing manual operation, reducing the welding steps and improving the welding efficiency. Synchronous splicing is carried out for all the welded connection parts that make up the lower tray of the battery box, improving the positioning accuracy, welding quality and welding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of welding of the lower tray of a battery box, and specifically relates to a welding tooling for the lower tray of a battery box with efficient positioning and its welding process. Background Art

[0002] As the main supporting structure of the battery box, the lower tray of the battery box is generally completely connected by bolt connection and welding. In the prior art, before the components of the lower tray of the battery box are assembled and welded, they need to be assembled and positioned. Generally, after positioning is completed using a simple positioning tooling, welding operations are then carried out at the lap joints of each connecting piece. The welding tooling for positioning the lower tray of the battery box in the prior art generally has a relatively simple structure and a simple operation method, meeting the usage requirements of the prior art. However, it still has the following disadvantages in actual use:

[0003] 1. For the welding tooling of the lower tray of the battery box in the prior art, each part needs to be separately assembled and positioned, increasing the operation steps and the processing man-hours, and using a lot of manual assistance operations, reducing the welding efficiency;

[0004] 2. For the welding tooling of the lower tray of the battery box in the prior art, the degree of automation is low, and the efficiency of effective positioning is low. Multiple assembling and positioning increases the cumulative error, and the overall welding accuracy and welding efficiency need to be further improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding tooling for the lower tray of a battery box with efficient positioning to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A welding tooling for the lower tray of a battery box with efficient positioning, including an intermediate positioning mechanism, a left-end positioning mechanism and a right-end positioning mechanism provided at the left and right ends of the intermediate positioning mechanism. The intermediate positioning mechanism includes an intermediate positioning seat assembly, an intermediate fixed clamping assembly provided at the upper end of the intermediate positioning seat assembly, and a docking driving assembly provided at the left and right ends in the middle of the intermediate positioning seat assembly. The left-end positioning mechanism includes a left-end positioning seat assembly and a left-end fixed clamping assembly provided at the upper end of the left-end positioning seat assembly. The right-end positioning mechanism includes a right-end positioning seat assembly and a right-end fixed clamping assembly provided at the upper end of the right-end positioning seat assembly. The docking driving assemblies at the left and right ends of the intermediate positioning seat assembly are respectively fixedly connected to the left-end positioning seat assembly and the right-end positioning seat assembly. Weld joint connecting piece positioning assemblies are symmetrically provided at the front and rear ends of the left-end fixed clamping assembly and the front and rear ends of the right-end fixed clamping assembly respectively.

[0007] Preferably, the intermediate positioning seat assembly includes an intermediate base, and intermediate positioning columns are symmetrically provided on the front and rear sides at the upper end of the intermediate base. Guide posts I are symmetrically provided outward on the left and right end faces of the intermediate base.

[0008] Preferably, the intermediate fixed clamping assembly includes driving vertical plates I symmetrically arranged at the left and right ends of the upper end of the intermediate base, and a driving cylinder I is fixedly installed on the outer side surface of the driving vertical plate I. The shaft end of the driving cylinder I is fixedly connected to a connecting plate I, and an intermediate clamping plate I is fixedly installed on the side surface of the connecting plate I. An intermediate supporting plate I is vertically connected outward in the middle of the intermediate clamping plate I. The upper and lower ends on the side surface of the intermediate clamping plate I are fixedly connected with guide posts II that are matched with the driving vertical plate I.

[0009] Preferably, the docking driving assembly includes driving cylinders II fixedly installed on the inner side surfaces of the left and right ends of the intermediate base. Outside the intermediate base and at the end face of the piston rod of the driving cylinder II, a connecting plate II is fixedly connected. The connecting plate II is fixedly connected to one end of the left end positioning seat assembly and the right end positioning seat assembly respectively.

[0010] Preferably, the left end positioning seat assembly includes a left end base fixedly connected to the left end face of the connecting plate II, and guiding holes I that are slidably matched with the guide posts I are provided at the front and rear ends of the left end base. Left end positioning posts are symmetrically arranged on the left and right sides of the upper end face of the left end base.

[0011] Preferably, the left end fixed clamping assembly includes two groups of oppositely arranged driving vertical plates II symmetrically arranged on the left and right sides of the upper end of the left end base, and a driving cylinder III is fixedly installed on the outer side surface of the driving vertical plate II. At the end of the piston rod of the driving cylinder III and on the inner side of the driving vertical plate II, a connecting plate III is fixedly connected. An intermediate clamping plate II is fixedly connected to the inner side surface of the connecting plate III. An intermediate supporting plate II is vertically and fixedly connected in the middle on the inner side of the intermediate clamping plate II. The upper and lower ends on the outer side of the intermediate clamping plate II are fixedly connected with guide posts III that are matched with the driving vertical plate II.

[0012] Preferably, the right end positioning seat assembly includes a right end base fixedly connected to the right end face of the connecting plate II. Guiding holes II that are matched with the guide posts I are symmetrically arranged at the front and rear ends of the right end base. Right end positioning posts are symmetrically and fixedly connected to the front and rear of the upper end of the right end base.

[0013] Preferably, the right end fixed clamping assembly includes two groups of oppositely arranged driving vertical plates III symmetrically arranged at the front and rear ends of the right end base. A driving cylinder IV is fixedly installed on the outer side surface of the driving vertical plate III. At the end of the piston rod of the driving cylinder IV and on the inner side of the driving vertical plate III, a connecting plate IV is fixedly connected. An intermediate clamping plate III is fixedly connected to the end of the connecting plate IV. An intermediate supporting plate III is vertically and fixedly connected in the middle on the inner side of the intermediate clamping plate III. The upper and lower ends on the outer side of the intermediate clamping plate III are symmetrically provided with guide posts IV that are matched with the driving vertical plate III.

[0014] Preferably, the weld connection component positioning assembly includes lifting cylinders V fixedly installed at the front and rear ends of the left base and the right base respectively, and a positioning seat is fixedly connected to the upper end of the piston rod of the lifting cylinder V. Welding positioning grooves I and II are respectively provided on the inner side surfaces of the positioning seat.

[0015] Preferably, the present invention also relates to a welding process for the lower tray of a battery box with high-efficiency positioning, and this process specifically includes the following steps:

[0016] Step 1: Place the middle frame part in the lower tray of the battery box. Lift and install the middle frame in the lower tray of the battery box onto the upper end of the middle positioning seat assembly, then pass the positioning holes on the front and rear sides of the middle frame through the corresponding middle positioning columns, place the bottom of the middle frame on the upper end of the middle support plate I of the middle clamping plate I, start the driving cylinder I, and make the middle clamping plates I on both sides of the middle frame clamp towards each other to fix the middle frame on the upper end of the middle fixed clamping assembly;

[0017] Step 2: Place the left splicing component of the lower tray of the battery box. Lift and install the left splicing component of the lower tray of the battery box onto the upper end of the left positioning seat assembly, then pass the positioning holes on the left splicing component through the corresponding left positioning columns, place the bottom of the left splicing component on the upper end of the middle support plate II of the middle clamping plate II, start the driving cylinder III, and make the middle clamping plates II on both sides of the left splicing component clamp towards each other to fix the left splicing component on the upper end of the left fixed clamping assembly;

[0018] Step 3: Place the right splicing component of the lower tray of the battery box. Lift and install the right splicing component of the lower tray of the battery box onto the upper end of the right positioning seat assembly, then pass the positioning holes on the right splicing component through the corresponding right positioning columns, place the bottom of the right splicing component on the upper end of the middle support plate III of the middle clamping plate III, start the driving cylinder IV, and make the middle clamping plates III on both sides of the right splicing component clamp towards each other to fix the right splicing component on the upper end of the right fixed clamping assembly;

[0019] Step 4: Start the assembly positioning. Synchronously start the driving cylinder II in the docking driving assembly, and synchronously splice the left base together with the left splicing component and the right base and the right splicing component to the left and right ends of the middle frame. Then start the lifting cylinder V in the weld connection positioning assembly, and raise the positioning seat to the corresponding position to prepare for the next operation;

[0020] Step 5: Place the intermediate connecting piece for welding. Insert the four groups of two types of connecting pieces into the corresponding welding positioning grooves respectively;

[0021] Step 6: Spot welding positioning. Spot weld the two sides of the connecting piece part to the connecting parts at both ends of the connecting piece respectively. Pay attention to dispersing the welding points and perform symmetric spot welding operations.

[0022] Step 7: Welding operation. Weld the welds of each part symmetrically from the inside to the outside in sequence to complete the welding of all welds.

[0023] Step 8: Taking parts and cleaning. After welding is completed, restore each component in the tooling to its original position, then remove the welded parts, perform slag cleaning, and clean the tooling to complete the entire welding process.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure of the present invention is reasonably arranged and has strong functionality, with the following advantages:

[0025] 1. In the present invention, the middle frame, left-end splicing component, and right-end splicing component that make up the lower tray of the battery box are placed and then synchronously spliced by starting the driving cylinder II, reducing manual operation, reducing the welding steps, and improving the welding efficiency.

[0026] 2. In the present invention, the middle frame, left-end splicing component, and right-end splicing component that make up the lower tray of the battery box are placed and then synchronously spliced by starting the driving cylinder II. The splicing is completed at one time, improving the positioning accuracy, welding quality, and welding efficiency. Description of the Drawings

[0027] Figure 1 Isometric view of the overall positioning of the lower tray of the battery box on the tooling of the present invention;

[0028] Figure 2 Front view of the overall positioning of the lower tray of the battery box on the tooling of the present invention;

[0029] Figure 3 For Figure 2 Isometric view of the sectional structure at the F-F position in

[0030] Figure 4 Isometric view of the overall structure of the present invention;

[0031] Figure 5 Front view of the overall structure of the present invention;

[0032] Figure 6 For Figure 5 Isometric view of the sectional structure at the A-A position in

[0033] Figure 7 For Figure 5 Isometric view of the sectional structure at the B-B position in

[0034] Figure 8 Left view of the overall structure of the present invention;

[0035] Figure 9 For Figure 8 Isometric view of the sectional structure at the H-H position in

[0036] Figure 10Isometric view of the overall structure of the intermediate positioning mechanism;

[0037] Figure 11 Isometric view of the overall structure of the left-end positioning mechanism;

[0038] Figure 12 Isometric view of the overall structure of the right-end positioning mechanism.

[0039] In the figure: 1. Intermediate positioning seat assembly; 2. Intermediate fixed clamping assembly; 3. Docking drive assembly; 4. Left-end positioning seat assembly; 5. Left-end fixed clamping assembly; 6. Right-end positioning seat assembly; 7. Right-end fixed clamping assembly; 8. Welded joint positioning component; 101. Intermediate base; 102. Intermediate positioning column; 103. Guide post I; 201. Driving vertical plate I; 202. Driving cylinder I; 203. Connecting plate I; 204. Intermediate clamping plate I; 205. Intermediate support plate I; 206. Guide post II; 301. Driving cylinder II; 302. Connecting plate II; 401. Left-end base; 402. Left-end positioning column; 403. Guide hole I; 501. Driving vertical plate II; 502. Driving cylinder III; 503. Connecting plate III; 504. Intermediate clamping plate II; 505. Intermediate support plate II; 506. Guide post III; 601. Right-end base; 602. Right-end positioning column; 603. Guide hole II; 701. Driving vertical plate III; 702. Driving cylinder IV; 703. Connecting plate IV; 704. Intermediate clamping plate III; 705. Intermediate support plate III; 706. Guide post IV; 801. Lifting cylinder V; 802. Positioning seat; 803. Welding positioning groove I; 804. Welding positioning groove II. Specific implementation mode

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1 to 12, the present invention provides a technical solution: an efficient positioning welding tooling for the lower tray of a battery box, including an intermediate positioning mechanism, a left-end positioning mechanism and a right-end positioning mechanism provided at the left and right ends of the intermediate positioning mechanism. The intermediate positioning mechanism includes an intermediate positioning seat assembly 1, an intermediate fixed clamping assembly 2 provided at the upper end of the intermediate positioning seat assembly 1, and a docking drive assembly 3 provided at the left and right ends in the middle of the intermediate positioning seat assembly 1. The left-end positioning mechanism includes a left-end positioning seat assembly 4 and a left-end fixed clamping assembly 5 provided at the upper end of the left-end positioning seat assembly 4. The right-end positioning mechanism includes a right-end positioning seat assembly 6 and a right-end fixed clamping assembly 7 provided at the upper end of the right-end positioning seat assembly 6. The docking drive assemblies 3 at the left and right ends of the intermediate positioning seat assembly 1 are respectively fixedly connected to the left-end positioning seat assembly 4 and the right-end positioning seat assembly 6. Weld joint connector positioning assemblies 8 are symmetrically provided at the front and rear ends of the left-end fixed clamping assembly 5 and the front and rear ends of the right-end fixed clamping assembly 7 respectively. Among them, the intermediate positioning seat assembly 1 plays a fixed support role relative to the intermediate fixed clamping assembly 2, the docking drive assembly 3 plays a traction drive role relative to the left-end positioning seat assembly 4 and the right-end positioning seat assembly 6, the left-end positioning seat assembly 4 and the right-end positioning seat assembly 6 play a bottom support role relative to the left-end fixed clamping assembly 5 and the right-end fixed clamping assembly 7, and the intermediate fixed clamping assembly 2, the left-end fixed clamping assembly 5 and the right-end fixed clamping assembly 7 play a role in fixing the workpiece.

[0042] Further, the intermediate positioning seat assembly 1 includes an intermediate base 101, and intermediate positioning columns 102 are symmetrically provided on the front and rear sides of the upper end of the intermediate base 101. Guide columns I 103 are symmetrically provided outward on the left and right end faces of the intermediate base 101. Here, the intermediate positioning columns 102 play a guiding and positioning role relative to the intermediate frame of the lower tray of the battery box, and the intermediate base 101 plays a bottom support role relative to the intermediate positioning columns 102.

[0043] Further, the intermediate fixed clamping assembly 2 includes driving vertical plates I 201 symmetrically provided at the left and right ends of the upper end of the intermediate base 101. A driving cylinder I 202 is fixedly installed on the outer side surface of the driving vertical plate I 201. A connecting plate I 203 is fixedly connected to the shaft end of the driving cylinder I 202. An intermediate clamping plate I 204 is fixedly installed on the side surface of the connecting plate I 203. An intermediate support plate I 205 is vertically connected outward in the middle of the intermediate clamping plate I 204. Guide columns II 206 that are fitted with the driving vertical plate I 201 are fixedly connected to the upper and lower ends on the side surface of the intermediate clamping plate I 204. During operation, the driving cylinder I 202 is driven to control the intermediate clamping plate I 204 to clamp towards each other, and the intermediate support plate I 205 plays a supporting role relative to the lower end surface of the workpiece.

[0044] Further, the docking drive assembly 3 includes drive cylinders II 301 fixedly installed on the inner side surfaces at the left and right ends of the middle base 101. On the outer side of the middle base 101 and at the end face of the piston rod of the drive cylinder II 301, a connecting plate II 302 is fixedly connected. The connecting plate II 302 is fixedly connected to one end of the left end positioning seat assembly 4 and the right end positioning seat assembly 6 respectively. During operation, by driving the drive cylinder II 301, the left end positioning seat assembly 4 and the right end positioning seat assembly 6 are driven to move towards each other on both sides of the middle fixed clamping assembly 2.

[0045] Further, the left end positioning seat assembly 4 includes a left end base 401 fixedly connected to the left end face of the connecting plate II 302. Guide holes I 403 that are slidably matched with the guide posts I 103 are provided at the front and rear ends of the left end base 401. On the left and right sides of the upper end face of the left end base 401, left end positioning posts 402 are symmetrically provided. The left end base 401 plays a role of bottom support for the left end positioning posts 402, and the guide holes I 403 play a role of guiding for the guide posts I 103.

[0046] Further, the left end fixed clamping assembly 5 includes two sets of oppositely arranged drive vertical plates II 501 symmetrically provided on the left and right sides of the upper end of the left end base 401. A drive cylinder III 502 is fixedly installed on the outer side surface of the drive vertical plate II 501. At the end of the piston rod of the drive cylinder III 502 and on the inner side of the drive vertical plate II 501, a connecting plate III 503 is fixedly connected. On the inner side surface of the connecting plate III 503, an intermediate clamping plate II 504 is fixedly connected. In the middle of the inner side of the intermediate clamping plate II 504, an intermediate support plate II 505 is vertically fixedly connected. At the upper and lower ends on the outer side of the intermediate clamping plate II 504, guide posts III 506 that are penetrated with the drive vertical plate II 501 are fixedly connected. Among them, the drive vertical plate II 501 plays a role of bottom support for the drive cylinder III 502, and the drive cylinder III 502 plays a driving role. During operation, the drive cylinder III 502 drives the intermediate clamping plate II 504 to move towards each other to clamp the side of the workpiece, completing the quick positioning and installation of the workpiece on the upper end of the left end fixed clamping assembly 5.

[0047] Further, the right end positioning seat assembly 6 includes a right end base 601 fixedly connected to the right end face of the connecting plate II 302. Guide holes II 603 that are penetrated with the guide posts I 103 are symmetrically provided at the front and rear ends of the right end base 601. At the front and rear of the upper end of the right end base 601, right end positioning posts 602 are symmetrically fixedly connected. Here, the main function of the right end base 601 is to provide a bottom support for the right end positioning posts 602, and the right end positioning posts 602 play a role of quick positioning for the workpiece, and the guide holes II 603 play a role of guiding for the guide posts I 103.

[0048] Further, the right - end fixed clamping assembly 7 includes two sets of oppositely - arranged driving vertical plates III 701 symmetrically arranged at the front and rear ends on the right - end base 601. A driving cylinder IV 702 is fixedly installed on the outer side surface of the driving vertical plate III 701. At the end of the piston rod of the driving cylinder IV 702 and on the inner side of the driving vertical plate III 701, a connecting plate IV 703 is fixedly connected. At the end of the connecting plate IV703, an intermediate clamping plate III704 is fixedly connected. In the middle of the inner side surface of the intermediate clamping plate III 704, an intermediate supporting plate III 705 is vertically fixedly connected. At the upper and lower ends of the outer side surface of the intermediate clamping plate III 704, guide columns IV 706 that are matched with the driving vertical plate III 701 are symmetrically arranged. Among them, the driving vertical plate III 701 plays a supporting role relative to the driving cylinder IV 702, the intermediate clamping plate III704 plays a clamping role relative to the workpiece, and the intermediate supporting plate III 705 plays a limiting and supporting role relative to the lower end surface of the workpiece.

[0049] Further, the weld - connecting - piece positioning assembly 8 includes lifting cylinders V 801 respectively and fixedly installed at the front and rear ends of the left - end base 401 and the right - end base 601. At the upper end of the piston rod of the lifting cylinder V 801, a positioning seat 802 is fixedly connected. On the inner side surface of the positioning seat 802, a welding positioning groove I 803 and a welding positioning groove II 804 are respectively arranged. During operation, the lifting cylinder V801 is driven to extend, so that the positioning seat 802 moves upward. Then, the welding positioning groove I 803 and the welding positioning groove II 804 are respectively aligned with the side surfaces of the weld connection of the battery - box lower - tray splicing piece. The weld - connecting piece is positioned through the side surfaces and the bottom surfaces of the welding positioning groove I 803 and the welding positioning groove II 804.

[0050] Further, the present invention also relates to a welding process for an efficiently - positioned battery - box lower tray, and the process specifically includes the following steps:

[0051] Step 1: Place the intermediate - frame part in the battery - box lower tray. Lift and install the intermediate frame in the battery - box lower tray to the upper end of the intermediate positioning seat assembly. Then, fit the positioning holes on the front and rear sides of the intermediate frame onto the corresponding intermediate positioning columns. Place the bottom of the intermediate frame on the upper end of the intermediate supporting plate I of the intermediate clamping plate I. Start the driving cylinder I to clamp the intermediate clamping plates I on both sides of the intermediate frame in opposite directions, so that the intermediate frame is fixed to the upper end of the intermediate fixed - clamping assembly.

[0052] Step 2: Place the left-end splicing component of the battery box lower tray. Lift and install the left-end splicing component of the battery box lower tray onto the upper end of the left-end positioning seat assembly. Then, insert the positioning holes on the left-end splicing component onto the corresponding left-end positioning posts. Place the bottom of the left-end splicing component onto the upper end of the middle support plate II of the middle clamping plate II. Start the driving cylinder III to clamp the middle clamping plate II on both sides of the left-end splicing component towards each other, so that the left-end splicing component is fixed to the upper end of the left-end fixed clamping assembly;

[0053] Step 3: Place the right-end splicing component in the battery box lower tray. Lift and install the right-end splicing component of the battery box lower tray onto the upper end of the right-end positioning seat assembly. Then, insert the positioning holes on the right-end splicing component onto the corresponding right-end positioning posts. Place the bottom of the right-end splicing component onto the upper end of the middle support plate III of the middle clamping plate III. Start the driving cylinder IV to clamp the middle clamping plate III on both sides of the right-end splicing component towards each other, so that the right-end splicing component is fixed to the upper end of the right-end fixed clamping assembly;

[0054] Step 4: Start the assembly positioning. Simultaneously start the driving cylinder II in the docking drive assembly to synchronously splice the left-end base together with the left-end splicing component and the right-end base and the right-end splicing component to the left and right ends of the middle frame. Then, start the lifting cylinder V in the weld connection positioning assembly to raise the positioning seat to the corresponding position to prepare for the next operation;

[0055] Step 5: Place the welded middle connectors. Insert the four groups of two types of connectors into the corresponding welding positioning grooves respectively;

[0056] Step 6: Spot welding positioning. Spot weld the two sides of the connector part to the connection parts at both ends of the connector respectively. Pay attention to dispersing the weld points and perform symmetric spot welding operations.

[0057] Step 7: Welding operation. Weld the welds at each part symmetrically, starting from the inside and then the outside in sequence to complete the welding of all welds.

[0058] Step 8: Take the parts and clean up. After welding, restore each component in the tooling to its original position. Then, remove the welded parts, perform slag cleaning, and clean the tooling to complete the entire welding process.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient positioning welding tooling for the lower tray of a battery box, characterized in that: It includes an intermediate positioning mechanism, a left-end positioning mechanism and a right-end positioning mechanism provided at the left and right ends of the intermediate positioning mechanism. The intermediate positioning mechanism includes an intermediate positioning seat assembly (1), an intermediate fixed clamping assembly (2) provided at the upper end of the intermediate positioning seat assembly (1), and a docking drive assembly (3) provided at the left and right ends in the middle of the intermediate positioning seat assembly (1). The left-end positioning mechanism includes a left-end positioning seat assembly (4) and a left-end fixed clamping assembly (5) provided at the upper end of the left-end positioning seat assembly (4). The right-end positioning mechanism includes a right-end positioning seat assembly (6) and a right-end fixed clamping assembly (7) provided at the upper end of the right-end positioning seat assembly (6). The docking drive assemblies (3) at the left and right ends of the intermediate positioning seat assembly (1) are respectively fixedly connected to the left-end positioning seat assembly (4) and the right-end positioning seat assembly (6). Weld joint connector positioning assemblies (8) are symmetrically provided at the front and rear ends of the left-end fixed clamping assembly (5) and the front and rear ends of the right-end fixed clamping assembly (7). The intermediate positioning seat assembly (1) includes an intermediate base (101), and intermediate positioning columns (102) are symmetrically provided on the front and rear sides at the upper end of the intermediate base (101). Guide posts I (103) are symmetrically provided outward on the left and right end faces of the intermediate base (101). The intermediate fixed clamping assembly (2) includes drive vertical plates I (201) symmetrically provided at the left and right ends at the upper end of the intermediate base (101). A drive cylinder I (202) is fixedly installed on the outer side surface of the drive vertical plate I (201). A connecting plate I (203) is fixedly connected to the shaft end of the drive cylinder I (202). An intermediate clamping plate I (204) is fixedly installed on the side surface of the connecting plate I (203). An intermediate support plate I (205) is vertically connected outward in the middle of the intermediate clamping plate I (204). Guide posts II (206) that are fitted through the drive vertical plate I (201) are fixedly connected to the upper and lower ends on the side surface of the intermediate clamping plate I (204). The docking drive assembly (3) includes drive cylinders II (301) fixedly installed on the inner side surfaces at the left and right ends of the intermediate base (101). A connecting plate II (302) is fixedly connected to the end face of the piston rod of the drive cylinder II (301) on the outer side of the intermediate base (101). The connecting plate II (302) is respectively fixedly connected to one end of the left-end positioning seat assembly (4) and the right-end positioning seat assembly (6). The left-end fixed clamping assembly (5) includes two sets of oppositely arranged driving vertical plates II (501) symmetrically arranged on the left and right sides of the upper end of the left-end base (401). A driving cylinder III (502) is fixedly installed on the outer side surface of the driving vertical plate II (501). The end of the piston rod of the driving cylinder III (502) is fixedly connected with a connecting plate III (503) inside the driving vertical plate II (501). A middle clamping plate II (504) is fixedly connected to the inner side surface of the connecting plate III (503). A middle supporting plate II (505) is vertically and fixedly connected to the middle inside the middle clamping plate II (504). Guide columns III (506) that are fitted with the driving vertical plate II (501) are fixedly connected to the upper and lower ends outside the middle clamping plate II (504).

2. The welding tooling for the lower tray of the battery box with high-efficiency positioning according to claim 1, wherein: The left-end positioning seat assembly (4) includes a left-end base (401) fixedly connected to the left end face of the connecting plate II (302). Guide holes I (403) that are slidably fitted with the guide columns I (103) are opened at the front and rear ends of the left-end base (401). Left-end positioning columns (402) are symmetrically arranged on the left and right sides of the upper end face of the left-end base (401).

3. An efficient positioning battery box lower tray welding tooling according to claim 2, characterized in that: The right-end positioning seat assembly (6) includes a right-end base (601) fixedly connected to the right end face of the connecting plate II (302). Guide holes II (603) that are fitted with the guide columns I (103) are symmetrically arranged at the front and rear ends of the right-end base (601). Right-end positioning columns (602) are symmetrically and fixedly connected to the front and rear of the upper end of the right-end base (601).

4. An efficient positioning welding tooling for the lower tray of a battery box according to claim 3, characterized in that: The right-end fixed clamping assembly (7) includes two sets of oppositely arranged driving vertical plates III (701) symmetrically arranged at the front and rear ends of the right-end base (601). A driving cylinder IV (702) is fixedly installed on the outer side surface of the driving vertical plate III (701). The end of the piston rod of the driving cylinder IV (702) is fixedly connected with a connecting plate IV (703) inside the driving vertical plate III (701). A middle clamping plate III (704) is fixedly connected to the end of the connecting plate IV (703). A middle supporting plate III (705) is vertically and fixedly connected to the middle of the inner side surface of the middle clamping plate III (704). Guide columns IV (706) that are fitted with the driving vertical plate III (701) are symmetrically arranged at the upper and lower ends of the outer side surface of the middle clamping plate III (704).

5. An efficient positioning welding tooling for the lower tray of a battery box according to claim 4, characterized in that: The weld joint positioning assembly (8) includes lifting cylinders V (801) respectively fixedly installed at the front and rear ends of the left-end base (401) and the right-end base (601). A positioning seat (802) is fixedly connected to the upper end of the piston rod of the lifting cylinder V (801). Welding positioning grooves I (803) and welding positioning grooves II (804) are respectively arranged at the inner side surface of the positioning seat (802).

6. The welding process of a welding tool for the lower tray of a battery box with efficient positioning according to claim 5, characterized in that: This process specifically includes the following steps: Step 1. Place the middle frame part in the lower tray of the battery box, hoist the middle frame in the lower tray of the battery box to the upper end of the middle positioning seat assembly, then pass the positioning holes on both the front and rear sides of the middle frame through the corresponding middle positioning posts, place the bottom of the middle frame on the upper end of the middle support plate I of the middle clamping plate I, start the driving cylinder I, and make the middle clamping plate I on both sides of the middle frame clamp towards each other, so that the middle frame is fixed to the upper end of the middle fixed clamping assembly; Step 2. Place the left-end splicing part of the lower tray of the battery box, hoist the left-end splicing part of the lower tray of the battery box to the upper end of the left-end positioning seat assembly, then pass the positioning holes on the left-end splicing part through the corresponding left-end positioning posts, place the bottom of the left-end splicing part on the upper end of the middle support plate II of the middle clamping plate II, start the driving cylinder III, and make the middle clamping plate II on both sides of the left-end splicing part clamp towards each other, so that the left-end splicing part is fixed to the upper end of the left-end fixed clamping assembly; Step 3. Place the right-end splicing part of the lower tray of the battery box, hoist the right-end splicing part of the lower tray of the battery box to the upper end of the right-end positioning seat assembly, then pass the positioning holes on the right-end splicing part through the corresponding right-end positioning posts, place the bottom of the right-end splicing part on the upper end of the middle support plate III of the middle clamping plate III, start the driving cylinder IV, and make the middle clamping plate III on both sides of the right-end splicing part clamp towards each other, so that the right-end splicing part is fixed to the upper end of the right-end fixed clamping assembly; Step 4. Start the assembly positioning, synchronously start the driving cylinder II in the docking driving assembly, and synchronously splice the left-end base together with the left-end splicing part and the right-end base and the right-end splicing part to the left and right ends of the middle frame. Then start the lifting cylinder V in the weld connection positioning assembly, and raise the positioning seat to the corresponding position to prepare for the next operation; Step 5. Place the welded middle connecting pieces, and insert the four groups of two types of connecting pieces into the corresponding welding positioning grooves respectively; Step 6. Spot welding positioning, perform spot welding on both sides of the connecting piece part respectively with the connecting parts at both ends of the connecting piece, pay attention to dispersing the welding points, and perform symmetric spot welding operations; Step 7. Welding operation, weld the welds at each part symmetrically in sequence from inside to outside first, and complete the welding of all welds; Step 8. Taking parts and cleaning, after welding is completed, restore each original part in the tooling to its original position, then remove the welded parts, perform slag cleaning, clean the tooling, and complete the entire welding process.

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