Automatic welding device for battery box body and working method of automatic welding device

Abstract

The invention discloses an automatic battery box welding device and a working method thereof, and relates to the technical field of battery box welding, the automatic battery box welding device comprises a conveying line, a preheating system, a welding system and a slow cooling system, the preheating system, the welding system and the slow cooling system are sequentially and adjacently arranged in the conveying direction of the conveying line, and the welding system comprises a clamping mechanism; the clamping mechanism can move flexibly and clamp and fix the frame body conveyed by the conveying line. The working method comprises the first step of placing the frame body, the second step of preheating, the third step of fixing, clamping and welding and the fourth step of slow cooling. The frame main body of the battery box body is preheated through the preheating system, and the frame main body of the battery box body is subjected to heat preservation and slow cooling through the slow cooling system; and a hot gas recovery system is arranged between the preheating system and the slow cooling system, so that waste gas in the preheating system is recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of battery case welding, and in particular to a battery case automatic welding device and a working method thereof. Background Art

[0002] With the booming new energy vehicle industry, the design and manufacture of new energy battery boxes has become a crucial technical field. The battery box, as a bridge between the vehicle body and the battery pack, is of great importance. It must not only meet the requirements of high strength and high precision, but also maintain excellent performance in complex and changing working conditions. However, in the welding process of the main frame of the battery box, the welding heat effect has become a thorny problem. This thermal effect often causes the frame to deform after welding, which in turn affects the overall dimensional accuracy and structural strength of the battery box, and may even pose a potential risk to the safety and service life of the battery.

[0003] Although the industry has explored some solutions to the deformation problem during the welding process of the main frame of the new energy battery box, such as the use of small-section welds, rigid fixture fixation, and pre-deformation treatment, these methods have obvious limitations in actual operation. For example, although rigid fixture fixation can curb welding deformation to a certain extent, it often leaves difficult-to-eliminate internal stress inside the weldment, which in turn affects the long-term stability and reliability of the weldment. Pre-deformation treatment requires accurate prediction of the welding deformation amount and direction in advance. Its operation process is not only complicated and cumbersome, but also difficult to control the accuracy.

[0004] In view of the above problems, it is urgent to design a new automatic welding device for new energy battery box and its working method, aiming to reduce the deformation of the frame body during the welding process, so as to ensure that the overall quality and performance of the battery box are in the best state. Summary of the invention

[0005] The object of the present invention is to provide an automatic welding device for a battery box and a working method thereof, which solves the problem of deformation of the frame body during welding by preheating and slow cooling in combination with welding clamping and fixing.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] Battery box automatic welding device, including:

[0008] Conveyor lines,

[0009] A preheating system, a welding system and a slow cooling system, wherein the preheating system, the welding system and the slow cooling system are arranged adjacent to each other in sequence along the conveying direction of the conveying line;

[0010] The preheating system preheats the frame body of the battery box, and the slow cooling system keeps the frame body of the battery box warm and slowly cools it; and a hot air recovery system is provided between the preheating system and the slow cooling system;

[0011] The welding system comprises a clamping mechanism, which can move flexibly and clamp and fix the frame body transported by the conveyor line.

[0012] As a further solution of the present invention: the conveyor line includes a transmission chain, a support plate is arranged on the transmission chain, and a receiving cross bar is symmetrically arranged on one side of the support plate.

[0013] As a further solution of the present invention: it also includes a positioning tool, the positioning tool includes a positioning substrate, and the positioning substrate is provided with multiple groups of limit members, a second support member and a second positioning member;

[0014] The frame body is positioned and supported by multiple sets of limit members, support members 2 and positioning members 3.

[0015] As a further solution of the present invention: the limiting member includes a connecting seat and a buffer block, the buffer block is made of elastic material, and the buffer block is in flexible contact with the frame body.

[0016] As a further solution of the present invention: the preheating system comprises a preheating box, a heating platform is arranged in the middle of the preheating box, a hot air plate is arranged on the heating platform, and the hot air plate is connected to the air source;

[0017] The inner space of the preheating box is divided into two parts, an upper part and an lower part, by a heating platform, which are an installation cavity located at the bottom of the preheating box and a preheating cavity located at the top of the preheating box;

[0018] External hot air is input into the preheating chamber to preheat the frame body moved into the preheating box.

[0019] As a further solution of the present invention: the preheating system further comprises an air blowing component, which is arranged in the preheating chamber and located above the conveying line;

[0020] The air blowing assembly blows air from the conveying line to preheat the frame body conveyed to the inside of the preheating box.

[0021] As a further solution of the present invention: the blowing assembly includes a T-shaped air seat, a rotating shaft is arranged on both sides of the T-shaped air seat, the T-shaped air seat is rotatably arranged on the preheating box body through the two rotating shafts, and a plurality of groups of air nozzles are arranged on the bottom surface of the T-shaped air seat;

[0022] The T-shaped air seat deflects at a uniform speed to preheat the frame body transported to the inside of the preheating box.

[0023] As a further solution of the present invention: the welding system comprises a welding shield, a welding robot is arranged inside the welding shield, and a clamping mechanism is arranged inside the welding system;

[0024] The clamping mechanism comprises two connecting plates, guide rods are slidably arranged on the connecting plates, the guide rods are cooperatively connected with a movable base plate, an adjusting cylinder is arranged at the bottom of the connecting plates, a supporting platform is arranged at the top of the movable base plate, a clamping base plate is arranged at the top of the supporting platform, and a plurality of clamping members are arranged around the clamping base plate;

[0025] A positioning member 1 or a supporting member 1 is provided on the inner side of each clamping member.

[0026] As a further solution of the present invention: the hot gas recovery system comprises an exhaust fan connected to the preheating system and an air jet connected to the slow cooling system, and the exhaust fan and the air jet are connected through an air pipe;

[0027] The hot air in the preheating chamber is extracted by the exhaust fan, input into the nozzle through the air delivery pipe, and ejected from the nozzle, so that the hot air is circulated.

[0028] As a further solution of the present invention: a working method of the battery case automatic welding device, characterized in that the above-mentioned battery case automatic welding device is used, comprising the following steps:

[0029] Step 1: Splice the frame body and place it in the positioning tooling, place the positioning tooling on the conveyor line, start the conveyor line to drive the frame body to move to the preheating box of the preheating system;

[0030] Step 2: When the preheating position is reached, the external hot air is ejected through the hot air plate to preheat the frame body. At the same time, the hot air is evenly ejected toward the frame body through the blowing component to accelerate the preheating.

[0031] Step 3: After preheating, start the conveyor line to convey the preheated frame body to the welding system. When it reaches the welding position, the clamping mechanism moves upward to locate and clamp each corresponding position of the frame body. After clamping, start the welding robot to perform welding.

[0032] Step 4: After welding, start the conveyor line to convey the welded frame body to the slow cooling system. The hot air in the preheating system is introduced into the slow cooling system through the hot air recovery system to keep the welded frame body warm.

[0033] Beneficial effects of the present invention:

[0034] The present invention preheats the frame body before welding the frame body of the battery box, reduces the cooling rate of the welding joint during welding, reduces the thermal stress and crack tendency during welding, and is beneficial to the escape of diffused hydrogen in the weld metal, thereby avoiding the generation of hydrogen-induced cracks; after welding the frame body of the battery box, the frame body is insulated and cooled to delay cooling, thereby extending the cooling time of the welding joint, reducing welding stress, avoiding the generation of welding defects, improving the weld structure and performance, and improving the strength and toughness of the welding joint; and the frame body that is transported and located on the positioning tool is fully clamped by a clamping mechanism, so that the welding is more stable and the deformation of the frame body due to welding thermal stress during welding is avoided.

[0035] The present invention arranges an air blowing assembly so that the branch pipe guides the hot air provided from the ventilation pipe into the T-shaped air seat, and then sprays it out from the air nozzle and directly sprays it on the frame body, thereby shortening the direct exchange distance of the hot air, thereby increasing the heating speed of the frame body and the preheating efficiency, and combined with the uniform deflection of the T-shaped air seat, each part of the frame body is evenly heated, thereby accelerating the overall preheating speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of the conveyor line of the present invention;

[0039] Figure 3 It is a schematic diagram of the connection structure between the conveyor line and the positioning tooling of the present invention;

[0040] Figure 4 It is a schematic diagram of the positioning tool structure of the present invention;

[0041] Figure 5 It is a schematic diagram of the overall cross-sectional structure of the first embodiment of the present invention;

[0042] Figure 6 It is a schematic diagram of the position structure of the clamping mechanism and the frame body of the present invention;

[0043] Figure 7 It is a schematic diagram of the structure of the clamping mechanism of the present invention;

[0044] Figure 8 It is a front view structural schematic diagram of the clamping mechanism of the present invention;

[0045] Fig. 9 is a schematic diagram of the overall cross-sectional structure of the second embodiment of the present invention;

[0046] Fig.10 It is a schematic diagram of the structure of the blowing component in the second embodiment of the present invention.

[0047] In the figure: 100, conveyor line; 101, conveyor frame; 102, transmission chain; 103, support plate; 104, receiving cross bar; 200, preheating system; 201, preheating box; 202, connecting port 1; 203, heating table; 204, installation cavity; 205, filter device; 206, hot air pipe; 207, hot air plate; 208, preheating cavity; 209, ventilation pipe; 210, blowing assembly; 211, T-shaped air seat; 212, rotating shaft; 213, air nozzle; 300, welding system; 301, welding protective cover; 302, machine table; 303, welding machine robot; 310, clamping mechanism; 311, connecting plate; 312, adjusting cylinder; 313, moving substrate; 314, supporting platform; 315, clamping substrate; 316, clamping member; 317, positioning member 1; 318, supporting member 1; 400, slow cooling system; 401, insulation box; 402, connecting port 2; 500, positioning tool; 501, positioning substrate; 502, limiting member; 503, supporting member 2; 504, positioning member 2; 505, air avoidance groove; 600, frame body; 700, heat recovery system; 701, exhaust fan; 702, nozzle. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Embodiment 1

[0050] like Figure 1-Figure 8 As shown, this embodiment provides a battery case automatic welding device, which includes a fixed conveyor line 100, on which a preheating system 200, a welding system 300 and a slow cooling system 400 are sequentially arranged along the conveying direction, and a hot gas recovery system 700 is connected between the preheating system 200 and the slow cooling system 400 to recycle hot gas, reduce resource waste, and save costs;

[0051] Before welding the frame body 600 of the battery case, the frame body 600 is preheated to reduce the cooling rate of the weld joint during welding, reduce the thermal stress and crack tendency during welding, and facilitate the escape of diffused hydrogen in the weld metal to avoid the generation of hydrogen-induced cracks; after welding the frame body 600 of the battery case, the frame body 600 is insulated to delay cooling, thereby extending the cooling time of the weld joint, reducing welding stress, avoiding the generation of welding defects, improving the weld structure and performance, and improving the strength and toughness of the weld joint.

[0052] like Figure 2 and Figure 3 As shown, the above-mentioned conveyor line 100 includes a conveyor frame 101 fixed to the ground by bolts, and a conveyor structure is arranged on the conveyor frame 101. The conveyor structure is a common chain conveyor structure, including a sprocket and a transmission chain 102. The sprocket is driven to rotate by a conveying motor, and the sprocket drives the transmission chain 102 for transmission. The conveyor line 100 in this embodiment also includes a support plate 103 fixed on the transmission chains 102 on both sides. The support plates 103 on both sides are arranged one by one, and the opposite sides of the two support plates 103 are symmetrically provided with a receiving cross bar 104.

[0053] Furthermore, the frame body 600 in this embodiment is orderly transmitted on the conveyor line 100 through the positioning tool 500. Before processing, the frame body 600 of the battery box is first spliced ​​and placed in the positioning tool 500.

[0054] The positioning tool 500 is as follows: Figure 4 As shown, it includes a positioning substrate 501, and multiple groups of limiting members 502 are arranged on the four sides of the positioning substrate 501, and multiple groups of supporting members 503 and positioning members 504 are arranged in the middle of the positioning substrate 501, where one supporting member 503 and one positioning member 504 form a group and are arranged adjacent to each other. Through the multiple groups of supporting members 503 and positioning members 504 combined with the multiple groups of limiting members 502, the frame body 600 is positioned and supported to ensure the accurate position of the frame body 600, and the limiting members 502 ensure that the spliced ​​frame body 600 is more stable during the transmission process.

[0055] It should be noted in this embodiment that the limit member 502 in this embodiment includes a connecting seat and a buffer block. The buffer block can be made of rubber and flexibly contacts with the frame body 600 of the battery box to avoid damage to the frame body 600. Generally, the frame body 600 is made of high-strength materials such as aluminum alloy; and the support member 2 503 in this embodiment includes a base and a support column, which contacts with the frame body 600 for support during the placement process, and the positioning member 2 504 in this embodiment includes a base and a positioning pin column, which cooperates with the positioning pin hole on the frame body 600 to achieve precise positioning of the placement position of the frame body 600.

[0056] Furthermore, the positioning fixture 500 is also provided with a plurality of sets of air-avoiding grooves 505 on the peripheral side of the positioning substrate 501, which are used to cooperate with the clamping mechanism 310 in the subsequent welding system 300, so that the clamping mechanism 310 can move smoothly.

[0057] It should also be noted in this embodiment that a wide groove running through both ends is provided in the middle of the positioning substrate 501. The wide groove is used to install the second support member 503 and the second positioning member 504 on the one hand, and to expand the space between the bottom surface of the frame body 600 and the positioning substrate 501 on the other hand, so as to improve the subsequent heat exchange efficiency.

[0058] Furthermore, if Figure 1 and Figure 5 As shown, the above-mentioned preheating system 200 includes a preheating box 201 placed at one end of the conveyor line 100, and the conveyor line 100 has connecting ports 202 symmetrically arranged on both sides of the middle part, the connecting port 202 on the side facing the welding system 300 is arranged as a discharge port, and the connecting port 202 on the other side is arranged as a feed port, and the conveyor line 100 passes through the two connecting ports 202. The frame body 600 is conveyed to the inside of the preheating box 201 through the conveyor line 100 for preheating operation.

[0059] A heating platform 203 is provided in the middle of the preheating box 201, and the internal space of the preheating box 201 is divided into two parts, namely, an installation cavity 204 located at the bottom end of the preheating box 201 and a preheating cavity 208 located at the top end of the preheating box 201. The heating platform 203 is located at the lower end of the corresponding conveyor line 100, and is arranged to fit the contour of the conveyor line 100, thereby reducing the matching space and reducing the loss caused by the subsequent preheating heat dissipation. A filter device 205 is installed in the installation cavity 204, and a hot air pipe 206 is connected to the air outlet of the filter device 205. The hot air pipe 206 passes through the heating platform 203 and is connected to the hot air plate 207. The hot air plate 207 is provided with an air cavity inside and a plurality of air holes on the top surface. One side of the air cavity is connected to the hot air pipe 206, and the other side is connected to the plurality of air holes. The hot air plate 207 is fixedly installed on a plane in the middle of the heating platform 203. The air inlet of the filter device 205 is connected to an external air source through a pipeline. Hot air is introduced through the external air source, and then impurities are filtered through the filter device 205, and flow into the hot air plate 207 from the hot air pipe 206. The hot air plate 207 blows toward the frame body 600 on the positioning tooling 500 for preheating.

[0060] It should be noted that in this embodiment, both connecting ports 202 are provided with heat insulation curtains to further prevent the heat from escaping, so that a hotter gas atmosphere is formed inside the preheating box 201 (the preheating chamber 208 above the heating table 203) to preheat the frame body 600 therein; and the above-mentioned filtering device 205 is an existing filtering structure for removing gas impurities entering the gas source to prevent the pores of the hot gas plate 207 from being blocked.

[0061] Furthermore, if Figure 1 , Figure 2 and Figure 5As shown, the welding system 300 includes a welding shield 301 located between the preheating system 200 and the slow cooling system 400. The welding shield 301 is used to provide comprehensive protection for the welding station to avoid the danger caused by spattering generated by welding, and also absorb the noise during the welding process to a certain extent.

[0062] A machine platform 302 is arranged on one side inside the welding protective cover 301, and the machine platform 302 is located outside the conveyor line 100. A welding robot 303 is arranged on the machine platform 302, and a clamping mechanism 310 is arranged at a corresponding position of the conveyor line 100. The frame body 600 conveyed and located on the positioning tooling 500 is fully clamped by the clamping mechanism 310, so that the welding is more stable and the deformation of the frame body 600 due to welding thermal stress during the welding process is avoided.

[0063] The welding robot 303 performs stable welding on each welding position of the frame body 600 . At the same time, due to the preheating of the front end, the frame body 600 has a certain temperature, which reduces the cooling speed of the welding joint when the welding robot 303 is welding.

[0064] It should be noted in this embodiment that the above-mentioned welding robot 303 is a prior art, and the specific structure is not described in detail here.

[0065] More specifically, if Figure 2 and Figure 6-Figure 8 Therefore, the above-mentioned clamping mechanism 310 includes a connecting plate 311 connected to both sides of the conveying frame 101. The two connecting plates 311 are arranged horizontally at the same height. The two connecting plates 311 can be fixed and installed by welding or bolts. Bushings are symmetrically arranged at both ends of the two connecting plates, and guide rods are slidably arranged in the bushings. The top ends of the four guide rods on the two connecting plates are cooperatively connected with a movable base plate 313, and an adjusting cylinder 312 is also arranged in the middle of the bottom of each connecting plate 311. The telescopic rod of the adjusting cylinder 312 passes through the corresponding connecting plate and is connected to the movable base plate 313. The upper and lower positions of the movable base plate 313 can be adjusted through the synchronous movement of the adjusting cylinders 312 on both sides.

[0066] Furthermore, a support platform 314 is arranged on the top of the movable substrate 313, a clamping substrate 315 is arranged on the top of the support platform 314, and a plurality of groups of clamping members 316 are arranged on the periphery of the clamping substrate 315, and a positioning member 317 or a supporting member 318 is arranged on the inner side of each clamping member 316. The clamping member 316 cooperates with the positioning member 317 or the supporting member 318 to fix the frame body 600. At the same time, the positioning member 317 at the corresponding position can further position the overall frame body 600, thereby eliminating the slight error generated during the conveying process.

[0067] It should be noted in this embodiment that the clamping member 316 is a clamping fixture such as ALC-80 that is driven by a cylinder to drive a lever pressure arm to perform a folding movement. The specific structure is not described in detail here. The positioning member 317 includes a cylinder and a positioning pin. The positioning pin is driven by the cylinder to move and insert into the corresponding pin hole of the frame body 600 for precise positioning. Then, the frame body 600 is pressed down and clamped in cooperation with the clamping member 316 on the same side, so that the frame body 600 is stably positioned and possible slight deviations are corrected. The support member 318 is a fixed-length support rod. The support member 318 and the clamping member 316 that cooperate with it define the clamping position of the frame body 600.

[0068] In this embodiment, when the conveyor line 100 conveys the preheated frame body 600 to the welding position, it is manually set and the adjusting cylinders 312 on both sides are started synchronously to drive the movable substrate 313 to move upward, and the movable substrate 313 drives the clamping substrate 315 to move upward, and the clamping substrate 315 drives multiple groups of mutually coordinated clamping members 316 and positioning members 317 or supporting members 318 to rise, extend from the air avoidance groove 505 of the positioning substrate 501, and position and clamp each corresponding position of the frame body 600 (wherein the clamping member 316 begins to bend and clamp after rising into place to avoid interference and movement obstruction), thereby ensuring the stability of welding and avoiding deformation during welding.

[0069] It should be noted in this embodiment that the clamping mechanism 310 can rise to the position where the positioning tool 500 cooperates with the conveyor line 100 (that is, the positioning tool 500 is on the conveyor line 100) to complete the clamping, and can also rise further to lift the positioning tool 500 and separate it from the conveyor line 100, thereby further preventing slight fluctuations from occurring during the welding process.

[0070] Furthermore, the above-mentioned slow cooling system 400 includes an insulation box 401 located on one side of the conveyor line 100, and connecting ports 402 are symmetrically arranged on both sides of the insulation box 401. The two connecting ports 402 are arranged in conjunction with the conveyor line 100, that is, the conveyor line 100 is arranged through the two connecting ports 402, wherein the connecting port 402 on the side close to the welding system 300 is a feed port, and the connecting port 402 on the other side is a discharge port. It should be noted that both connecting ports 402 are provided with thermal insulation curtains for blocking the heat inside the insulation box 401 to prevent the heat from dissipating too quickly, and the insulation box 401 is made of insulation material, such as rock wool board.

[0071] The heat preservation box 401 is used to keep the frame body 600 warm after welding and delay cooling, thereby extending the cooling time of the welded joint.

[0072] It should be noted that the heat recovery system 700 of the present embodiment includes an exhaust fan 701 connected to the top of the preheating box 201 and an injection nozzle 702 connected to the inner top of the insulation box 401, wherein the exhaust fan 701 is connected to the preheating chamber 208 to extract hot air, and the exhaust fan 701 and the injection nozzle 702 are connected through an air pipe. The hot air extracted from the preheating chamber 208 by the exhaust fan 701 is input into the air pipe, and then ejected from the injection nozzle 702 through the air pipe, so that the exhaust gas in the preheating system 200 is recycled.

[0073] Embodiment 2

[0074] In order to further accelerate the preheating efficiency of the preheating system 200 and ensure that the frame body 600 is heated uniformly, this embodiment adds a blowing assembly 210 in the preheating chamber 208 of the preheating box 201 on the basis of the first embodiment, wherein the blowing assembly 210 is located above the frame body 600 and is arranged corresponding to the inside of the frame body 600. The blowing assembly 210 includes a T-shaped air seat 211, and rotating shafts 212 are symmetrically arranged at both ends of the T-shaped air seat 211, and the T-shaped air seat 211 is rotatably arranged on the preheating box 201 through two rotating shafts 212, and the rotating shaft 212 on one side is connected to a driving device, and the driving device drives the T-shaped air seat 211 to deflect, so as to realize the supply of hot air to different positions inside the frame body 600.

[0075] Specific as Fig. 9 and Fig.10 As shown, the T-shaped air seat 211 is provided with an air storage cavity inside, a plurality of groups of air nozzles 213 are arranged on the bottom surface of the T-shaped air seat 211, and a branch pipe is connected to the hot air pipe 206, the branch pipe also passes through the heating platform 203 and is connected to a vent pipe 209 from the side, the other end of the vent pipe 209 is connected to the T-shaped air seat 211 and is interconnected with its air storage cavity, the hot air provided is introduced from the vent pipe 209 to the T-shaped air seat 211 through the branch pipe, and then sprayed out by the air nozzle 213, and directly sprayed on the frame body 600, shortening the direct exchange distance of the hot air, thereby increasing the heating speed of the frame body 600, improving the preheating efficiency, and combining with the uniform deflection of the T-shaped air seat 211, so that each part of the frame body 600 is evenly heated, thereby accelerating the overall preheating speed.

[0076] It should be noted that in this embodiment, a plurality of preheating holes are also provided at the bottom of the positioning substrate 501 , so that the hot air blown out by the hot air plate 207 can quickly pass through the preheating holes and directly exchange heat with the frame body 600 .

[0077] The above-mentioned driving device is not specifically limited, and can be a driving motor or a driving cylinder, etc., as long as it can drive the T-shaped air seat 211 to deflect at a uniform speed.

[0078] Embodiment 3

[0079] This embodiment provides a working method of the battery box automatic welding device in Embodiment 2, and the working method comprises the following steps:

[0080] Step 1: Splice the frame body 600 and place it in the positioning tool 500, place the positioning tool 500 on the conveyor line 100, and start the conveyor line 100 to drive the frame body 600 to move to the preheating box 201 of the preheating system 200;

[0081] Step 2: When the preheating position is reached, hot air is introduced from the outside, passes through the filter device 205, and is transmitted to the hot air plate 207 via the hot air pipe 206. The hot air plate 207 sprays hot air to preheat the frame body 600. At the same time, part of the hot air from the hot air pipe 206 enters the vent pipe 209 through the branch pipe, and the vent pipe 209 enters the T-shaped air seat 211, and then is evenly sprayed to the frame body 600 through the air nozzle 213 to accelerate the preheating;

[0082] Step 3: After preheating, start the conveyor line 100 to convey the preheated frame body 600 to the welding system 300. When the frame body 600 reaches the welding position, start the regulating cylinders 312 on both sides synchronously to drive the moving substrate 313 to move upward, and the moving substrate 313 drives the clamping substrate 315 to move upward. The clamping substrate 315 drives multiple groups of mutually cooperating clamping members 316 and positioning members 317 or supporting members 318 to rise, extend from the air avoidance groove 505 of the positioning substrate 501, and locate and clamp the corresponding positions of the frame body 600. After clamping, start the welding robot 303 to weld.

[0083] Step 4: After welding, start the conveyor line 100 to convey the welded frame body 600 to the insulation box 401. The hot air extracted from the preheating chamber 208 by the exhaust fan 701 is input into the air pipe, and then sprayed out from the nozzle 702 through the air pipe to provide an insulation environment for the insulation box 401 and reduce the cooling rate of the welding joint.

[0084] It should be noted in this embodiment that the preheating system 200 and the slow cooling system 400 can be operated in advance to reduce the impact of the temperature difference in the initial stage.

[0085] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0086] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. Automatic welding device for battery box, characterized in that: include: Conveyor line (100), A preheating system (200), a welding system (300) and a slow cooling system (400), wherein the preheating system (200), the welding system (300) and the slow cooling system (400) are arranged adjacent to each other in sequence along the conveying direction of the conveying line (100); The preheating system (200) preheats the frame body (600) of the battery box, and the slow cooling system (400) keeps the frame body (600) of the battery box warm and slowly cools it; and a hot gas recovery system (700) is provided between the preheating system (200) and the slow cooling system (400); The welding system (300) comprises a clamping mechanism (310), and the clamping mechanism (310) is capable of flexibly moving and clamping and fixing the frame body (600) transported by the conveying line (100).

2. The battery case automatic welding device according to claim 1, characterized in that: The conveyor line (100) comprises a transmission chain (102), a support plate (103) is arranged on the transmission chain (102), and a receiving cross bar (104) is symmetrically arranged on one side of the support plate (103).

3. The battery case automatic welding device according to claim 1 or 2, characterized in that: It also includes a positioning tool (500), the positioning tool (500) includes a positioning substrate (501), and the positioning substrate (501) is provided with multiple groups of limit members (502), a second support member (503) and a second positioning member (504); The frame body (600) is positioned and supported by multiple groups of limiting members (502), supporting members (503) and positioning members (504).

4. The battery case automatic welding device according to claim 3, characterized in that: The limiting member (502) comprises a connecting seat and a buffer block, the buffer block is made of elastic material, and the buffer block is in flexible contact with the frame body (600).

5. The battery case automatic welding device according to claim 3, characterized in that: The preheating system (200) comprises a preheating box (201), a heating platform (203) is arranged in the middle of the preheating box (201), a hot air plate (207) is arranged on the heating platform (203), and the hot air plate (207) is connected to an air source; The internal space of the preheating box (201) is divided into two parts, an upper part and an lower part, by a heating platform (203), which are respectively an installation cavity (204) located at the bottom end of the preheating box (201) and a preheating cavity (208) located at the top end of the preheating box (201); External hot air is input into the preheating chamber (208) to preheat the frame body (600) that moves into the preheating box (201).

6. The battery case automatic welding device according to claim 5, characterized in that: The preheating system (200) further comprises an air blowing assembly (210), wherein the air blowing assembly (210) is disposed in the preheating chamber (208) and is located above the conveying line (100); The air blowing assembly (210) blows air from the conveying line (100) to preheat the frame body (600) conveyed to the inside of the preheating box (201).

7. The battery case automatic welding device according to claim 6, characterized in that: The blowing assembly (210) comprises a T-shaped air seat (211), rotating shafts (212) are arranged on both sides of the T-shaped air seat (211), the T-shaped air seat (211) is rotatably arranged on the preheating box (201) via the two rotating shafts (212), and a plurality of groups of air nozzles (213) are arranged on the bottom surface of the T-shaped air seat (211); The T-shaped air seat (211) deflects at a uniform speed to preheat the frame body (600) transported to the inside of the preheating box (201).

8. The battery case automatic welding device according to claim 3, characterized in that: The welding system (300) comprises a welding protective cover (301), a welding robot (303) is arranged inside the welding protective cover (301), and a clamping mechanism (310) is arranged inside the welding system (300); The clamping mechanism (310) comprises two connecting plates (311), guide rods are slidably arranged on the connecting plates (311), the guide rods are cooperatively connected with a movable base plate (313), an adjusting cylinder (312) is arranged at the bottom of the connecting plates (311), a supporting platform (314) is arranged at the top of the movable base plate (313), a clamping base plate (315) is arranged at the top of the supporting platform (314), and a plurality of groups of clamping members (316) are arranged around the clamping base plate (315); Furthermore, a positioning member (317) or a supporting member (318) is provided on the inner side of each clamping member (316).

9. The battery case automatic welding device according to claim 5, characterized in that: The hot gas recovery system (700) comprises an exhaust fan (701) connected to the preheating system (200) and an air jet head (702) connected to the slow cooling system (400), and the exhaust fan (701) and the air jet head (702) are connected via an air transmission pipe; The hot air in the preheating chamber (208) is extracted by the exhaust fan (701), input into the spray head (702) through the air supply pipe, and sprayed out from the spray head (702), so that the hot air is recycled.

10. The working method of the battery box automatic welding device is characterized in that: Using the battery box automatic welding device as described in any one of claims 1 to 9, comprising the following steps: Step 1: Splice the frame body (600) and place it in the positioning tool (500), place the positioning tool (500) on the conveyor line (100), and start the conveyor line (100) to drive the frame body (600) to move into the preheating box (201) of the preheating system (200); Step 2: When the preheating position is reached, the external hot air is ejected through the hot air plate (207) to preheat the frame body (600). At the same time, the hot air is evenly ejected toward the frame body (600) through the blowing assembly (210) to accelerate the preheating. Step 3: After preheating, the conveyor line (100) is started to convey the preheated frame body (600) to the welding system (300). When the frame body (600) reaches the welding position, the clamping mechanism (310) is moved upward to locate and clamp the corresponding positions of the frame body (600). After clamping, the welding robot (303) is started to perform welding. Step 4: After welding is completed, the conveyor line (100) is started to convey the welded frame body (600) to the slow cooling system (400). The hot air in the preheating system (200) is introduced into the slow cooling system (400) through the hot air recovery system (700) to keep the welded frame body (600) warm.

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