Welding tool for lower box body of battery box

Abstract

The utility model discloses a welding tool for a lower box body of a battery box, which comprises a mounting plate, a clamping plate and a clamping plate, the first positioning and clamping assemblies are arranged on the mounting plate, and each first positioning and clamping assembly comprises a first positioning piece and a first clamping piece; and the second positioning and clamping assemblies are arranged on the mounting plate, and each second positioning and clamping assembly comprises a second positioning piece and a second clamping piece. According to the positioning and clamping device, the side plates and the longitudinal beams can be positioned and clamped at the same time through the first positioning pieces and the first clamping pieces, the end plates and the cross beams can be positioned and clamped at the same time through the second positioning pieces and the second clamping pieces, and therefore the original positioning and clamping scheme that clamping pieces are arranged on the three faces of a plate is replaced; the arrangement number and the occupied space of the clamping pieces are reduced, so that the clamping pieces can be reasonably distributed in a smaller space, and positioning and clamping of the plates are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding frock technical field especially relates to a welding frock of battery box lower box. BACKGROUND

[0002] With the rapid development of new energy vehicles, the capacity of the battery is getting larger and larger, and the volume of the battery box is also increasing, so the structural strength of the battery box lower box is also required higher and higher. Among them, the battery box lower box is usually welded by front and rear end plates, left and right side plates, longitudinal beams and cross beams. Before welding, the above-mentioned plates need to be positioned and clamped, and a plurality of plates are pre-assembled together according to the predetermined position, and then welding can be carried out.

[0003] In the existing welding frock, a plurality of clamping pieces are arranged on both sides and above the plate respectively, so that the clamping pieces are respectively abutted on the side wall and the upper surface of the plate to realize the positioning and clamping of the plate.

[0004] However, due to the increasing requirement of the structural strength of the battery box lower box, the number of plates is increasing, and the distance between the plates is getting smaller. If the clamping pieces are still arranged on both sides and above the plate according to the existing scheme, the distance between the plates cannot accommodate the clamping pieces. Moreover, due to the structural feature that the upper end of the plate is small and the lower end is large, after the welding is completed, the clamping pieces do not have enough space to avoid the lower box to be taken out upward, that is, the lower box will interfere with the clamping pieces when it is taken out upward. SUMMARY

[0005] In view of the above shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a welding frock of battery box lower box, which solves the problems that the distance between the plates of the battery box lower box is too small to accommodate too many clamping pieces and the clamping pieces block the upward taking.

[0006] The technical solution adopted by the utility model to solve its technical problem is a welding frock of battery box lower box, which comprises two end plates respectively at opposite ends, two side plates respectively at opposite sides, and a plurality of longitudinal beams and a plurality of cross beams arranged between the two side plates. Among them, the side plates and the longitudinal beams are arranged along the first direction, the end plates and the cross beams are arranged along the second direction, and the welding frock comprises:

[0007] A mounting plate is used to support the lower box.

[0008] a plurality of first positioning and clamping assemblies arranged on the mounting plate, each of the first positioning and clamping assemblies comprising a first positioning member and a first clamping member, the first positioning member being capable of extending into the side plate or the longitudinal beam in a third direction to position the side plate or the longitudinal beam in a first direction, the first clamping member comprising a first main clamping block and a first auxiliary clamping block, the first main clamping block being capable of moving in a second direction and abutting against a side wall of the side plate or the longitudinal beam, the first auxiliary clamping block being capable of rotating into or out of a space above the side plate or the longitudinal beam and abutting against or separating from an upper end of the side plate or the longitudinal beam;

[0009] a plurality of second positioning and clamping assemblies arranged on the mounting plate, each of the second positioning and clamping assemblies comprising a second positioning member and a second clamping member, the second positioning member being capable of extending into the end plate or the transverse beam in a first direction to position the end plate or the transverse beam in a second direction, the second clamping member comprising a second main clamping block and a second auxiliary clamping block, the second main clamping block being capable of moving in the first direction and abutting against a side wall of the end plate or the transverse beam, the second auxiliary clamping block being capable of rotating into or out of a space above the end plate or the transverse beam and abutting against or separating from an upper end of the end plate or the transverse beam;

[0010] wherein any two of the first direction, the second direction and the third direction are perpendicular to each other.

[0011] Further, the second clamping member further comprises a rotating cylinder and a connecting rod connected to the rotating cylinder, the connecting rod being connected to the second auxiliary clamping block.

[0012] Further, a plurality of the second clamping members are arranged on the outer side of the two end plates, the second main clamping block is capable of abutting against the outer side wall of the side plate, and the length direction of the connecting rod is perpendicular to the length direction of the end plate.

[0013] Further, a plurality of the second clamping members are arranged on the side of the transverse beam, and the length direction of the connecting rod forms an acute angle or an obtuse angle with the length direction of the transverse beam.

[0014] Further, a plurality of coarse positioning assemblies are further included to position the transverse beam, the longitudinal beam, the side plate or the end plate, each of the coarse positioning assemblies comprising two oppositely arranged coarse positioning blocks, the upper end of each of the coarse positioning blocks being provided with a guide inclined surface, and the distance between the two guide inclined surfaces in the same coarse positioning assembly gradually decreases from top to bottom.

[0015] Further, the first positioning member comprises a first main positioning pin, a first auxiliary positioning pin, a first telescopic cylinder and a second telescopic cylinder, the first main positioning pin being connected to the first telescopic cylinder, and the first auxiliary positioning pin being connected to the second telescopic cylinder.

[0016] Further, the second positioning member is arranged below the end plate, the second positioning member comprises a sliding rail arranged along a first direction, and a sliding block slidably arranged on the sliding rail, and a second positioning pin, a pushing handle and a reset air cylinder are arranged on the sliding block.

[0017] Further, the grounding bracket is arranged outside the end plate.

[0018] The welding tool further comprises a third positioning and clamping assembly, the third positioning and clamping assembly comprises a sliding block slidably arranged along a first direction, and a fixed clamping block and a movable clamping block are arranged on the sliding block, the fixed clamping block is fixedly connected to the sliding block, and the movable clamping block is slidably arranged on the sliding block in a direction towards or away from the fixed clamping block, so that the grounding bracket can be clamped between the fixed clamping block and the movable clamping block.

[0019] Further, a third positioning pin is arranged on the fixed clamping block, and the third positioning pin is slidably arranged along a first direction to extend into the positioning hole of the end plate.

[0020] Compared with the prior art, the utility model has at least the following beneficial effects:

[0021] (1) The first positioning member and the first clamping member can simultaneously realize positioning and clamping of the side plate and the longitudinal beam, the second positioning member and the second clamping member can simultaneously realize positioning and clamping of the end plate and the cross beam, and the original positioning and clamping scheme of arranging clamping members on three surfaces of the plate is replaced, the number of arranged clamping members and the occupied space are reduced, and the clamping members can be reasonably distributed in a smaller space and realize positioning and clamping of the plate.

[0022] (2) The first auxiliary clamping block and the second auxiliary clamping block are rotatably arranged on the mounting plate, so that the first auxiliary clamping block and the second auxiliary clamping block not only can exert downward force on the plate during pressing, but also can rotate to the space between the two plates after welding is completed, thereby avoiding the space above the plate to facilitate upward taking out of the lower box.

[0023] (3) The connecting rod is obliquely arranged, so that the second positioning member can be arranged in a relatively narrow space and can avoid the space for upward taking out of the lower box.

[0024] (4) The handheld pushing handle is pushed, and the second positioning pin is moved towards the positioning hole on the end plate, and the operator can observe whether the second positioning pin is aligned with the positioning hole on the end plate during the pushing process. If the second positioning pin is not aligned with the positioning hole, the pushing of the second positioning pin can be stopped at any time. In this way, the problem that the second positioning pin directly impacts on the end plate to cause damage to the end plate and the tool caused by driving of the telescopic air cylinder can be avoided.

[0025] (5) Set the bolted first connecting rod and second connecting rod on the slider, and set the pushing handle and the second positioning pin on the second connecting rod. By adjusting the number and thickness of the adjusting gaskets between the first connecting rod and the second connecting rod, the position of the second positioning pin can be adjusted, so that the second positioning pin can be adjusted to the position of aligning the positioning hole on the end plate, and the error accumulation of the end plate and the side plate is eliminated.

[0026] (6) Set the fixed clamping block and the movable clamping block. By sliding the movable clamping block towards the fixed clamping block, the clamping of the grounding bracket is realized. Then, by sliding the sliding block, the grounding bracket is driven to move towards the end plate until the grounding bracket abuts against the end plate. In this way, the clamping and positioning of small parts are realized. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a top view of the welding tool in the embodiment;

[0028] Figure 2 It is a structural schematic view of the first main positioning pin and the first telescopic cylinder in the embodiment;

[0029] Figure 3 It is a structural schematic view of the second main positioning pin and the second telescopic cylinder in the embodiment;

[0030] Figure 4 It is a structural schematic view of the first main clamping block in the embodiment;

[0031] Figure 5 It is a structural schematic view of the first auxiliary clamping block in the embodiment;

[0032] Figure 6 It is a structural schematic view of the second positioning member in the embodiment;

[0033] Figure 7 It is a structural schematic view of the second main clamping block in the embodiment;

[0034] Figure 8 It is a structural schematic view of the second auxiliary clamping block in the embodiment;

[0035] Figure 9 It is a structural schematic view of the third positioning and clamping assembly in the embodiment;

[0036] Figure 10 It is a structural schematic view of the mounting plate and the coarse positioning block in the embodiment;

[0037] In the figure:

[0038] 100, first positioning and clamping assembly; 110, first main positioning pin; 120, first telescopic cylinder; 130, first auxiliary positioning pin; 140, second telescopic cylinder; 150, first main clamping block; 160, first auxiliary clamping block;

[0039] 200, second positioning and clamping assembly; 210, second positioning pin; 220, slide rail; 221, sliding block; 230, reset cylinder; 240, pushing handle; 250, first connecting rod; 251, second connecting rod; 260, second main clamping block; 270, second auxiliary clamping block; 271, connecting rod; 272, rotating cylinder;

[0040] 300, third positioning and clamping assembly; 310, third positioning pin; 320, fixed clamping block; 330, movable clamping block; 340, sliding block;

[0041] 400, mounting plate; 410, rough positioning block; DETAILED DESCRIPTION

[0042] The following is a specific embodiment of the utility model and in combination with the drawings, the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0043] Please refer to Figures 1-10 The utility model discloses a welding tool of battery box lower box body, the battery box lower box body includes two end plates at opposite ends respectively, two side plates at opposite sides respectively and multiple longitudinal beams and multiple cross beams set between two side plates, wherein, the side plate and longitudinal beam all are along first direction setting, the end plate and cross beam all are along second direction setting, the welding tool includes:

[0044] Mounting plate 400 is used to support the lower box body;

[0045] A plurality of first positioning and clamping assemblies 100 are arranged on the mounting plate 400, the first positioning and clamping assembly 100 includes first positioning piece and first clamping piece, the first positioning piece can extend into the side plate or longitudinal beam along the third direction to position the position of the side plate or longitudinal beam in the first direction, the first clamping piece includes first main clamping block 150 and first auxiliary clamping block 160, the first main clamping block 150 can move along the second direction and abut with the side wall of the side plate or longitudinal beam, the first auxiliary clamping block 160 can rotatably enter or exit the space above the side plate or longitudinal beam and abut or separate from the upper end of the side plate or longitudinal beam;

[0046] A plurality of second positioning and clamping assemblies 200 are arranged on the mounting plate 400, and each of the second positioning and clamping assemblies 200 comprises a second positioning member and a second clamping member, the second positioning member is capable of extending into the end plate or the cross beam along the first direction to position the end plate or the cross beam in the second direction, and the second clamping member comprises a second main clamping block 260 and a second auxiliary clamping block 270, the second main clamping block 260 is capable of moving along the first direction and abutting against the side wall of the end plate or the cross beam, and the second auxiliary clamping block 270 is capable of rotating into or out of the space above the end plate or the cross beam and abutting against or separating from the upper end of the end plate or the cross beam.

[0047] Any two of the first direction, the second direction and the third direction are perpendicular to each other.

[0048] First of all, it should be pointed out that in the lower box body, the side plates and the longitudinal beams are parallel to each other, and the end plates and the cross beams are parallel to each other. The first direction can be understood as the length direction of the lower box body, i.e. the length direction of the side plates and the longitudinal beams; the second direction can be understood as the width direction of the lower box body, i.e. the length direction of the end plates and the cross beams; and the third direction can be understood as the thickness direction of the lower box body.

[0049] Specifically, the first positioning member is moved along the third direction and extends into the positioning hole on the side plate or the longitudinal beam to position the side plate and the longitudinal beam in the first direction; then the first main clamping block 150 is moved along the second direction to abut against the side surface of the side plate or the longitudinal beam to position the side plate and the longitudinal beam in the second direction; finally, the first auxiliary clamping block 160 is rotated to abut against the upper surface of the side plate or the longitudinal beam to position the side plate and the longitudinal beam in the third direction.

[0050] Similarly, the second positioning and clamping assembly 200 also works in this way. The second positioning member is moved along the first direction and extends into the positioning hole on the end plate or the cross beam to position the end plate and the cross beam in the second direction; then the second main clamping block 260 is moved along the first direction to abut against the side surface of the end plate or the cross beam to position the end plate and the cross beam in the first direction; finally, the second auxiliary clamping block 270 is rotated to abut against the upper surface of the end plate or the cross beam to position the end plate and the cross beam in the third direction.

[0051] In this way, the first positioning member and the first clamping member can simultaneously position and clamp the side plates and the longitudinal beams, and the second positioning member and the second clamping member can simultaneously position and clamp the end plates and the cross beams, thereby replacing the original positioning and clamping scheme of arranging clamping members on three sides of the plate, reducing the number of clamping members arranged and the occupied space, and enabling the clamping members to be reasonably distributed in a smaller space and to position and clamp the plate.

[0052] Importantly, the first auxiliary clamping block 160 and the second auxiliary clamping block 270 are rotatably arranged on the mounting plate 400, so that they not only can exert downward force on the plates during pressing, but also can rotate to the space between the plates after welding, thereby avoiding the space above the plates to facilitate upward removal of the lower box.

[0053] Further, the second clamping member further comprises a rotating cylinder 272 and a connecting rod 271 connected with the rotating cylinder 272, and the connecting rod 271 is connected with the second auxiliary clamping block 270.

[0054] Further, a plurality of second clamping members are arranged on the outer side of each of the end plates, the second main clamping block 260 can abut against the outer side wall of the side plate, and the length direction of the connecting rod 271 is perpendicular to the length direction of the end plate.

[0055] Specifically, since the two end plates are respectively located at the outermost side of the entire lower box, the outer side of the end plate has sufficient space to arrange the second clamping member, so that the second clamping member for positioning and clamping the end plate is arranged on the outer side of the end plate, so as not to occupy the space on the inner side of the end plate, and the space on the inner side of the end plate can be arranged for the second clamping member for positioning and clamping the cross beam. In this way, the plurality of second clamping members can be reasonably distributed on the mounting plate 400, and the end plate and the cross beam are respectively positioned and clamped.

[0056] Further, a plurality of second clamping members are arranged on the lateral side of the cross beam, and the angle between the length direction of the connecting rod 271 and the length direction of the cross beam is an acute angle or an obtuse angle. That is, the connecting rod 271 is obliquely arranged between the adjacent two cross beams, or obliquely arranged between the cross beam and the end plate.

[0057] Specifically, six cross beams are arranged between the two end plates, which results in a small distance between the adjacent two cross beams and between the cross beam and the end plate. Therefore, the connecting rod 271 is obliquely arranged, so that the second positioning member can not only be arranged in a relatively narrow space, but also can avoid the space for upward removal of the lower box.

[0058] Further, a plurality of coarse positioning assemblies are further included for positioning the cross beam, the longitudinal beam, the side plate or the end plate, and the coarse positioning assembly comprises two oppositely arranged coarse positioning blocks 410, the upper end of the coarse positioning block 410 is provided with a guide inclined surface, and the distance between the two guide inclined surfaces in the same coarse positioning assembly gradually decreases from top to bottom.

[0059] Specifically, the distance between the two guide inclined surfaces gradually decreases from top to bottom, so that the plate can slide into the area between the two coarse positioning blocks 410 along the guide inclined surface, so as to realize the preliminary positioning of the plate.

[0060] Further, the two coarse positioning blocks 410 in the same coarse positioning assembly are staggered to facilitate the coarse positioning block 410 to avoid the first positioning and clamping assembly 100, the second positioning and clamping assembly 200 and the third positioning and clamping assembly 300.

[0061] Further, the first positioning member includes a first main positioning pin 110, a first auxiliary positioning pin 130, a first telescopic cylinder 120 and a second telescopic cylinder 140, the first main positioning pin 110 is connected with the first telescopic cylinder 120, and the first auxiliary positioning pin 130 is connected with the second telescopic cylinder 140.

[0062] The second positioning member is arranged below the end plate, and includes a slide rail 220 arranged in a first direction, and a slide block 221 slidably arranged on the slide rail 220, and a second positioning pin 210, a pushing handle 240 and a reset cylinder 230 are arranged on the slide block 221.

[0063] Specifically, the first main positioning pin 110 is driven by the first telescopic cylinder 120, and the first auxiliary positioning pin 130 is driven by the second telescopic cylinder 140, so as to realize automatic positioning of the side plate. The second positioning pin 210 is moved by manually pulling the pushing handle 240. The reset cylinder 230 is used to drive the second positioning pin 210 to automatically exit from the positioning hole of the end plate after welding.

[0064] It should be noted that, during pre-splicing, two side plates are usually placed on the mounting plate 400 for positioning and clamping, and then two end plates are placed for positioning and clamping. When the side plate is positioned, since the end plate is not installed at this time, the side plate is not constrained by other plates, which makes the first main positioning pin 110 and the first auxiliary positioning pin 130 can be easily aligned and inserted into the positioning hole of the side plate. However, since there are errors in the manufacturing and processing of the end plate and the side plate, the errors of the end plate and the side plate are superimposed together, which leads to the situation that the second positioning pin 210 cannot be aligned with the positioning hole of the end plate when the end plate is positioned.

[0065] Therefore, the first main positioning pin 110 is driven by the first telescopic cylinder 120, and the first auxiliary positioning pin 130 is driven by the second telescopic cylinder 140, so as to realize automatic positioning of the side plate. When the end plate is positioned, the second positioning pin 210 is moved towards the positioning hole on the end plate by manually holding the pushing handle 240, and the operator can observe whether the second positioning pin 210 is aligned with the positioning hole on the end plate during the pushing process. If the second positioning pin 210 is not aligned with the positioning hole, the pushing of the second positioning pin 210 can be stopped at any time. In this way, the problem that the second positioning pin 210 directly hits the end plate and causes damage to the end plate and the tooling can be avoided.

[0066] Further, the first connecting rod 250 is arranged on the slider 221, the second connecting rod 251 is bolted on the first connecting rod 250, and a plurality of adjusting shims are arranged between the first connecting rod 250 and the second connecting rod 251, and the second positioning pin 210 and the pushing handle 240 are arranged on the second connecting rod 251.

[0067] Specifically, the first connecting rod 250 and the second connecting rod 251 are arranged on the slider 221 in a bolted manner, and the pushing handle 240 and the second positioning pin 210 are arranged on the second connecting rod 251, and the position of the second positioning pin 210 can be adjusted by adjusting the number and thickness of the adjusting shims between the first connecting rod 250 and the second connecting rod 251, so that the second positioning pin 210 can be adjusted to be aligned with the positioning hole on the end plate, and the error accumulation of the end plate and the side plate is eliminated.

[0068] It should be further pointed out that the main reason for the misalignment of the second positioning pin 210 and the positioning hole on the end plate is the accumulation of the thickness error of the side plate and the length error of the end plate, and the error of the side plate and the end plate in the height direction will not be superimposed on the position of the positioning hole on the end plate.

[0069] Meanwhile, the second connecting rod 251 and the first connecting rod 250 partially overlap in the second direction, and the overlapping part is bolted, that is, the adjusting shims adjust the position of the second positioning pin 210 in the second direction. That is, only the position of the second positioning pin 210 in the length direction of the end plate needs to be adjusted, so that the second positioning pin 210 can be aligned with the positioning hole on the end plate.

[0070] Further, the end plate further has a grounding bracket on the outer side thereof;

[0071] The welding tool further comprises a third positioning and clamping assembly 300, the third positioning and clamping assembly 300 comprises a sliding block 340 which can slide in a first direction, a fixed clamping block 320 and a movable clamping block 330 are arranged on the sliding block 340, the fixed clamping block 320 is fixedly connected to the sliding block 340, and the movable clamping block 330 slides on the sliding block 340 in a direction towards or away from the fixed clamping block 320, so that the grounding bracket can be clamped between the fixed clamping block 320 and the movable clamping block 330.

[0072] Specifically, the grounding bracket is a component arranged on the outer side of the end plate, and the component has a small volume and is difficult to be positioned and clamped by conventional positioning and clamping members.

[0073] Based on this, the fixed clamping block 320 and the movable clamping block 330 are arranged, the movable clamping block 330 is slid in the direction towards the fixed clamping block 320 to clamp the grounding support, and then the sliding block 340 is slid to drive the grounding support to move towards the end plate until the grounding support abuts against the end plate. In this way, the clamping and positioning of the small component are realized.

[0074] Further, the third positioning pin 310 is arranged on the fixed clamping block 320 and can slide in the first direction to extend into the positioning hole of the end plate.

[0075] Specifically, since the fixed clamping block 320 is fixedly arranged on the sliding block 340, the position of the fixed clamping block 320 relative to the end plate in the second direction and the third direction is fixed, and therefore, the third positioning pin 310 arranged on the fixed clamping block 320 can ensure that the position of the third positioning pin 310 relative to the end plate in the second direction and the third direction is fixed, so that the third positioning pin 310 can extend into the positioning hole of the end plate and the grounding support can be moved to the correct position.

[0076] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0077] In addition, in the utility model, the description such as "first", "second", "one" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0078] In the utility model, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0079] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but must be based on that a person having ordinary skill in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of such technical solutions does not exist, also not within the protection scope required by the utility model.

Claims

1. A welding tool for a lower case of a battery box, the lower case of the battery box including two end plates at opposite ends, respectively, two side plates at opposite sides, respectively, and a plurality of longitudinal beams and a plurality of cross beams provided between the two side plates, wherein, The side plates and the longitudinal beams are arranged along a first direction, and the end plates and the cross beams are arranged along a second direction, characterized in that the welding tool comprises: a mounting plate for supporting the lower box body; a plurality of first positioning and clamping assemblies arranged on the mounting plate, each of the first positioning and clamping assemblies comprising a first positioning member and a first clamping member, the first positioning member being capable of extending into the side plate or the longitudinal beam along a third direction to position the side plate or the longitudinal beam in the first direction, the first clamping member comprising a first main clamping block and a first auxiliary clamping block, the first main clamping block being capable of moving along the second direction and abutting against a side wall of the side plate or the longitudinal beam, and the first auxiliary clamping block being capable of rotating into or out of a space above the side plate or the longitudinal beam and abutting against or separating from an upper end of the side plate or the longitudinal beam; a plurality of second positioning and clamping assemblies arranged on the mounting plate, each of the second positioning and clamping assemblies comprising a second positioning member and a second clamping member, the second positioning member being capable of extending into the end plate or the cross beam along the first direction to position the end plate or the cross beam in the second direction, the second clamping member comprising a second main clamping block and a second auxiliary clamping block, the second main clamping block being capable of moving along the first direction and abutting against a side wall of the end plate or the cross beam, and the second auxiliary clamping block being capable of rotating into or out of a space above the end plate or the cross beam and abutting against or separating from an upper end of the end plate or the cross beam; wherein any two of the first direction, the second direction and the third direction are perpendicular to each other.

2. The welding tooling for a lower battery case according to claim 1, wherein The second clamping member further comprises a rotating air cylinder and a connecting rod connected with the rotating air cylinder, and the connecting rod is connected with the second auxiliary clamping block.

3. The welding tooling for a lower battery box according to claim 2, wherein, A plurality of second clamping members are arranged on the outer side of each of the two end plates, the second main clamping block is capable of abutting against the outer side wall of the side plate, and the length direction of the connecting rod is perpendicular to the length direction of the end plate.

4. The welding tooling for a lower battery box according to claim 2, wherein, A plurality of second clamping members are arranged on the side of the cross beam, and the length direction of the connecting rod forms an acute angle or an obtuse angle with the length direction of the cross beam.

5. The welding tool for a lower case of a battery box according to claim 1, wherein A plurality of coarse positioning assemblies are further arranged to position the cross beam, the longitudinal beam, the side plate or the end plate, each of the coarse positioning assemblies comprising two oppositely arranged coarse positioning blocks, the upper end of each of the coarse positioning blocks being provided with a guide inclined surface, and the distance between the two guide inclined surfaces in the same coarse positioning assembly gradually decreases from top to bottom.

6. The welding tool for a lower case of a battery box according to claim 1, wherein The first positioning member comprises a first main positioning pin, a first auxiliary positioning pin, a first telescopic air cylinder and a second telescopic air cylinder, the first main positioning pin being connected with the first telescopic air cylinder, and the first auxiliary positioning pin being connected with the second telescopic air cylinder.

7. The welding tool for a lower case of a battery box according to claim 1, wherein The second positioning member is arranged below the end plate and comprises a slide rail arranged along the first direction and a slide block slidably arranged on the slide rail, the slide block being provided with a second positioning pin, a pushing handle and a reset air cylinder.

8. The welding tool for a lower case of a battery box according to claim 7, wherein A first connecting rod is arranged on the slider, a second connecting rod is bolted on the first connecting rod, a plurality of adjusting shims are arranged between the first connecting rod and the second connecting rod, and the second positioning pin and the pushing handle are arranged on the second connecting rod.

9. The welding tool for a lower case of a battery box according to claim 1, wherein The end plate is further provided with a grounding bracket on the outer side thereof; The welding tool further comprises a third positioning and clamping assembly, the third positioning and clamping assembly comprises a sliding block which can slide in a first direction, a fixed clamping block and a movable clamping block are further arranged on the sliding block, the fixed clamping block is fixedly connected to the sliding block, and the movable clamping block slides on the sliding block in a direction towards or away from the fixed clamping block, so that the grounding bracket can be clamped between the fixed clamping block and the movable clamping block.

10. The welding tool for a lower case of a battery box according to claim 9, wherein A third positioning pin is further arranged on the fixed clamping block, and the third positioning pin can slide in the first direction to extend into the positioning hole of the end plate.

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