A battery pack double-sided spot welding mechanism and a method of using the same

Abstract

The application relates to the technical field of battery pack spot welding, and relates to a double-sided spot welding mechanism for a battery pack and a use method thereof.The double-sided spot welding mechanism comprises an upper support, a translation assembly is arranged on the upper support, position adjusting assemblies are symmetrically arranged on the translation assembly, and a welding treatment assembly is arranged on the position adjusting assemblies.The position adjusting assemblies are used for position correction before clamping by a clamping assembly, so that the fixed clamping jaw is prevented from being jammed during clamping, and the position deviation of a support frame is prevented from causing the subsequent welding to be unable to be aligned; the welding position reserved in a spot welding groove is blown before welding, impurities are swept away, the oxygen content in air around the spot welding groove is reduced, the possibility of false welding is reduced, the welding position is prevented from being oxidized during welding, the welding quality is guaranteed, harmful gas and tiny splashes generated during welding are collected by the welding treatment assembly after welding, adjacent welding points are prevented from being polluted, and the welding quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery pack spot welding, and particularly relates to a battery pack double-sided spot welding mechanism and a use method thereof. BACKGROUND

[0002] In the battery pack processing process, a nickel sheet needs to be welded and fixed on the positive and negative poles of a battery through laser welding. When the battery pack is working, it needs to provide powerful power for the equipment. High temperature generated during laser spot welding melts the metal, promotes the formation of metallurgical bonding between the nickel strip and the metal atoms of the cell pole, and the fusion at the molecular level makes the resistance of the connection extremely low, which can efficiently transmit large current and meet the use requirements of the battery in the later period. The existing spot welding equipment for battery packs can basically meet the daily use requirements, but the battery pack needs to be fixed by using a clamping jaw or a tool before welding. When the clamping jaw is fixed, the positional deviation of the battery pack can easily cause the clamping jaw to jam or damage the battery pack. In order to prevent the continuous welding from overheating the cell, the time interval of welding needs to be prolonged, which affects the welding efficiency. Therefore, it is necessary to design a battery pack double-sided spot welding mechanism and a use method thereof. SUMMARY

[0003] The purpose of the application is to provide a battery pack double-sided spot welding mechanism and a use method thereof which are simple in structure and reasonable in design.

[0004] The application achieves the above-mentioned purpose through the following technical solutions:

[0005] A battery pack double-sided spot welding mechanism, comprising an upper support, characterized in that: a translation assembly is arranged on the upper support, position adjusting assemblies are symmetrically arranged on the translation assembly, a laser welding gun is installed on the position adjusting assemblies, a welding treatment assembly is arranged on the position adjusting assemblies, and a clamping assembly is arranged at the bottom of the upper support.

[0006] The clamping assembly comprises a lower support fixed at the bottom of the upper support, a pre-positioning assembly is arranged on the lower support, the pre-positioning assembly comprises a pre-pressing support slidingly connected to the lower support, the pre-pressing support is fixedly connected to the output end of a pre-pressing cylinder, the pre-pressing cylinder is fixed to the lower support, a positioning mechanism is installed on the pre-pressing support, a clamping cylinder is installed on the lower support, and the output end of the clamping cylinder is fixedly connected with a fixed clamping jaw.

[0007] The welding treatment assembly comprises a connecting frame fixed to the translation assembly, an installation ring is fixedly installed on the connecting frame, the top of the installation ring is connected with a gas suction pump through a pipeline, gas suction grooves are uniformly formed in the inner wall of the installation ring, a filter screen is installed on the part of the inner wall of the installation ring where the gas suction grooves are formed, and a self-cleaning structure is arranged in the installation ring.

[0008] As a further optimization scheme of the present application, the positioning mechanism comprises an outer sleeve fixed in the groove of the pre-pressing support side wall, the outer sleeve is sleeved on the conical sleeve, and the conical sleeve is fixed on the top of the support frame, the side wall of the support frame is uniformly provided with a spot welding notch, and the side wall of the spot welding notch is provided with an air outlet, and the air outlet and the conical sleeve are in communication.

[0009] As a further optimization scheme of the present application, the pre-pressing support is symmetrically provided with a jet pump on both sides of the top, and the output end of the jet pump is connected to the outer sleeve through a pipeline.

[0010] As a further optimization scheme of the present application, the translation assembly comprises a translation screw rotatably connected in the upper support, one end of the translation screw is fixedly connected with a translation motor, and the translation motor is fixed on the upper support, the upper support is slidably connected with a translation table, and the translation table is connected to the translation screw.

[0011] As a further optimization scheme of the present application, the position adjusting assembly comprises a support table mounted on the translation table, the support table is fixedly connected with a lifting cylinder, and the output end of the lifting cylinder is fixedly connected to the mounting bracket.

[0012] As a further optimization scheme of the present application, the mounting bracket is symmetrically provided with a cylinder support on both sides of the bottom, the cylinder support is fixedly connected with a connecting bracket, and the cylinder support is fixedly connected with a suction pump, the cylinder support is fixedly provided with a push cylinder, and the output end of the push cylinder is fixedly connected to the push table, and the laser welding gun is fixed on the push table.

[0013] As a further optimization scheme of the present application, the self-cleaning structure comprises a cleaning ring slidably connected in the mounting ring, the cleaning ring is fixedly mounted on the outer support ring, and the cleaning ring is provided with a limiting frame, the outer support ring is symmetrically provided with a spring, and one end of the spring is fixedly connected to the connecting bracket.

[0014] As a further optimization scheme of the present application, the support frame is located on the feeding belt, the feeding belt is sleeved on the transmission wheel, the transmission wheel is rotatably connected to the feeding frame, and the feeding motor is mounted on the feeding frame, and the output end of the feeding motor is connected to one of the transmission wheels through the belt pulley and the belt.

[0015] As a further optimization scheme of the present application, the bottom of the feeding frame is provided with a bottom support, the bottom support is provided with a supporting cylinder, the output end of the supporting cylinder is fixedly connected with a supporting plate, one side of the bottom support is provided with a limiting cylinder, and the output end of the limiting cylinder is fixedly connected with a material blocking frame.

[0016] A use method of a battery pack double-sided spot welding mechanism, specifically comprising the following steps:

[0017] Step one, battery pack loading: place the battery pack and nickel belt in the support frame, so that the nickel belt contacts the positive and negative poles of the battery cells in the battery pack, the support frame is placed at one end of the feeding belt, the feeding motor drives the feeding belt to run through the transmission wheel, the limit cylinder drives the material blocking frame to move up during the movement of the support frame following the feeding belt, after the support frame is blocked by the material blocking frame, the support cylinder lifts the support plate upward, and the support frame is lifted by the support plate;

[0018] Step two, clamping and fixing: the pre-press cylinder drives the pre-press support to move down, the outer sleeve is sleeved on the conical sleeve, after the pre-press support completely fits on the top of the support frame, the output end of the air jet pump is connected with the cavity inside the support frame through the pipeline, the outer sleeve and the conical sleeve, at the same time, the position of the support frame is adjusted by the cooperation of the outer sleeve and the conical sleeve during the downward movement of the pre-press support, then the clamping cylinder drives the two fixed clamps to move close to each other to clamp and fix the support frame;

[0019] Step three, pre-welding treatment: before welding, the translation motor drives the translation screw to rotate, and the translation screw and the translation table cooperate to drive the entire position adjusting assembly to move along the axis direction of the translation screw, at the same time, the lifting cylinder drives the cylinder support to move up and down, so that the laser welding gun is on the two sides of the support frame waiting for welding, then the air jet pump delivers inert gas into the cavity of the support frame through the conical sleeve and the outer sleeve, finally, the inert gas is sprayed out from the air outlet to blow the welding position reserved for the spot welding slot, and remove impurities, at the same time, the oxygen content in the air around the spot welding slot is reduced;

[0020] Step four, double-sided welding: during welding, the push cylinder pushes the push table to move close to the support frame, the outer support ring moves during the process of the gun head of the laser welding gun approaching the spot welding slot, the tension spring drives the cleaning ring to separate from the filter screen, the welding head of the laser welding gun penetrates the spot welding slot for spot welding, the metal atoms between the nickel belt and the cell pole are combined by the laser welding gun to form metallurgical bond, after the welding of a single point is completed, the air in the installation ring is extracted by the air pump, and the negative pressure in the installation ring drives the external air to be sucked into the installation ring through the air extraction groove, at the same time, the air jet pump outputs the airflow again to carry out the harmful gas and small splashes generated in the spot welding slot during welding through the air outlet, the harmful gas penetrates the filter screen into the installation ring, and the small splashes are intercepted by the filter screen, the unidirectional airflow generated in the whole process can forcibly cool the welding part to accelerate cooling and prevent the continuous welding from causing the battery cells in the battery pack to overheat and be damaged, then the push cylinder drives the laser welding gun to return to the original position, during the returning process, the spring pulls the outer support ring close to the installation ring, and the small impurities intercepted on the filter screen are cleaned by the cleaning ring, so as to avoid the blockage of the filter screen, then the translation assembly and the position adjusting assembly cooperate to weld all the welding parts in turn.

[0021] The beneficial effects of the present application are:

[0022] The present application drives the pre-pressing support to move down by the pre-pressing cylinder, and the outer sleeve is sleeved on the conical sleeve, after the pre-pressing support completely fits on the upper side of the support frame, the clamping cylinder drives the two side fixing clamps to approach each other to fix and clamp the support frame, so that the position of the support frame can be adjusted through the cooperation of the outer sleeve and the conical sleeve, avoiding the clamping clamps from being stuck, and preventing the position of the support frame from being deviated to cause the subsequent welding to be out of position.

[0023] After the pre-pressing support completely fits on the upper side of the support frame, the output end of the air jet pump is communicated with the cavity in the support frame through the pipeline, the outer sleeve and the conical sleeve, the laser welding gun is kept on the two sides of the support frame to wait for welding before welding, then the air jet pump delivers the inert gas into the cavity in the support frame through the conical sleeve and the outer sleeve, and finally the inert gas is sprayed out from the air outlet, so as to blow the welding position reserved for the spot welding groove, remove impurities, reduce the oxygen content in the air around the spot welding groove, reduce the possibility of false welding, avoid the welding position from being oxidized during welding, and ensure the welding quality.

[0024] During the process that the laser welding gun head approaches the spot welding groove by driving the pusher table to approach the support frame by the pusher cylinder, the outer support ring is driven to move by the limiting frame, the tension spring is stretched, and the cleaning ring is separated from the filter screen, after welding, the air in the mounting ring is extracted by the air pump, the negative pressure generated in the mounting ring will draw the external air into the mounting ring from the air extraction groove, and the airflow generated by the air jet pump continues to output and pass through the air outlet, so as to carry out the harmful gas and the tiny splashes generated in the spot welding groove during welding, avoid pollution of adjacent welding points, and the harmful gas passes through the filter screen and enters the mounting ring for collection, which is convenient for subsequent treatment, and the tiny splashes are intercepted by the filter screen, in addition, the unidirectional airflow generated in the whole process can forcibly cool the welding position to accelerate cooling and prevent the battery pack from being damaged due to overheat of the battery cells caused by continuous welding. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the present application;

[0026] Figure 2 is a schematic diagram of the installation of the welding processing assembly in the present application;

[0027] Figure 3 is an explosion structure schematic diagram of the welding processing assembly of the present application;

[0028] Figure 4 is an explosion diagram of part of the structure of the present application;

[0029] Figure 5 is a three-dimensional diagram of part of the structure of the present application;

[0030] Figure 6 is the schematic diagram of the pre-positioning assembly of the present application;

[0031] Figure 7 is Figure 6 is the partial enlarged view of region A in

[0032] Figure 8 is Figure 6 is the partial enlarged view of region B in

[0033] Figure 9 is the schematic diagram of the installation position of the support plate of the present application;

[0034] Figure 10 is the flow chart of the use method of the present application.

[0035] In the figure: 1, upper support; 2, translation assembly; 3, position adjusting assembly; 4, laser welding gun; 5, welding processing assembly; 6, clamping assembly; 7, pre-positioning assembly; 8, spot welding slot; 21, translation screw; 22, translation motor; 23, translation table; 31, support table; 32, lifting cylinder; 33, mounting frame; 34, cylinder support; 35, pushing cylinder; 36, pushing table; 51, connecting frame; 52, mounting ring; 53, air suction pump; 54, air suction groove; 55, filter screen; 56, cleaning ring; 57, outer support ring; 58, limiting frame; 59, spring; 61, lower support; 62, clamping cylinder; 63, fixed clamping jaw; 71, pre-pressing support; 72, pre-pressing cylinder; 73, outer sleeve; 74, conical sleeve; 75, support frame; 81, air outlet; 82, air jet pump; 91, feeding belt; 92, feeding frame; 93, support cylinder; 94, support plate; 95, limiting cylinder; 96, material blocking frame. DETAILED DESCRIPTION

[0036] The present application will be further described in detail below with reference to the accompanying drawings. It is necessary to point out here that the following detailed description is only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0037] Embodiment: Please refer to Figures 1-9The utility model provides a kind of battery pack double-sided spot welding mechanism, including upper support 1, translation assembly 2 is provided on upper support 1, position adjusting assembly 3 is symmetrically provided on translation assembly 2, translation assembly 2 can adjust the horizontal position of position adjusting assembly 3, laser welding gun 4 is installed on position adjusting assembly 3, during spot welding, position adjusting assembly 3 is used to drive laser welding gun 4 to move to welding position, welding processing assembly 5 is provided on position adjusting assembly 3, after welding, harmful gas and tiny spatter generated during welding are collected by welding processing assembly 5, the bottom of upper support 1 is provided with clamping assembly 6 for clamping battery pack.

[0038] Please refer to Figures 5-8 , clamping assembly 6 includes lower support 61 fixed by bolt on the bottom of upper support 1, predetermined position assembly 7 is provided on lower support 61, predetermined position assembly 7 includes pre-pressing support 71 slidingly connected on lower support 61, pre-pressing support 71 is fixedly connected with the output end of pre-pressing cylinder 72, and pre-pressing cylinder 72 is fixed on lower support 61, positioning mechanism is installed on pre-pressing support 71, clamping cylinder 62 is installed on lower support 61, clamping cylinder 62 is double-end cylinder, and the output end of clamping cylinder 62 is fixedly connected with fixed clamping jaw 63 for clamping support frame 75, the position of support frame 75 can be locked by driving the two sides of fixed clamping jaw 63 to approach each other, positioning mechanism includes outer sleeve 73 fixedly installed in the recess in the side wall of pre-pressing support 71, outer sleeve 73 is sleeved on conical sleeve 74, and conical sleeve 74 is fixed on the top of support frame 75, point welding slot 8 is uniformly arranged on the side wall of support frame 75, the side wall of support frame 75 is a cavity structure, and gas outlet 81 is arranged on the side wall of point welding slot 8, gas outlet 81 is in communication with conical sleeve 74, jet pump 82 is symmetrically arranged on the top of both sides of pre-pressing support 71, and the output end of jet pump 82 is connected to outer sleeve 73 through pipeline, the gas inlet end of jet pump 82 is connected to the gas source of inert gas, and the inert gas can be input into the cavity of support frame 75 through jet pump 82 and finally sprayed from gas outlet 81.

[0039] Please refer to Figure 1 And Figure 5 , translation assembly 2 includes translation screw 21 rotationally connected on upper support 1, one end of translation screw 21 is connected with translation motor 22 through coupling, and translation motor 22 is fixed on upper support 1, translation table 23 is slidingly connected on upper support 1, and translation table 23 is connected on translation screw 21 through ball nut embeddedly installed inside.

[0040] Please refer to Figure 1 And Figure 5The position adjusting assembly 3 comprises a support table 31 mounted on the translation table 23, a lifting cylinder 32 fixedly connected to the support table 31, an output end of the lifting cylinder 32 fixedly connected to a mounting bracket 33, and the bottom of the mounting bracket 33 symmetrically provided with a cylinder bracket 34, a push cylinder 35 fixed to the cylinder bracket 34, and an output end of the push cylinder 35 fixedly connected to a push table 36. The laser welding gun 4 is fixed to the push table 36, which is slidingly connected to the cylinder bracket 34 through a sliding rail and a sliding block. The symmetrically distributed cylinder brackets 34 support the two laser welding guns 4 on the two sides of the support frame 75. During the processing, the battery pack can be spot welded by the two laser welding guns 4 on both sides. The lifting cylinder 32 can drive the cylinder bracket 34 to move up and down, change the height of the laser welding gun 4, and thus complete welding at different heights.

[0041] Please refer to Figures 2-3 The welding processing assembly 5 comprises a connecting frame 51 fixed to the cylinder bracket 34, and a mounting ring 52 fixedly installed on the connecting frame 51. The mounting ring 52 is of a hollow structure, and an air suction pump 53 is fixed to the cylinder bracket 34 through a pipeline connected to the top of the mounting ring 52. The output of the air suction pump 53 is connected to a filter element, which can purify the collected harmful gas. Uniformly arranged on the inner wall of the mounting ring 52 are air suction grooves 54, which are in communication with the air suction end of the air suction pump 53 through the inner cavity of the mounting ring 52. A filter screen 55 is installed in the groove formed on the inner wall of the mounting ring 52, and the filter screen 55 is installed to fit the air suction groove 54. A cleaning ring 56 is slidingly connected to the mounting ring 52, and the cleaning ring 56 is fixedly installed on an outer supporting ring 57. A limiting frame 58 is arranged on the cleaning ring 56, and a spring 59 is arranged between the outer supporting ring 57 and the connecting frame 51.

[0042] Please refer to Figure 1 , Figure 4 and Figure 9 The support frame 75 is located on the feeding belt 91, the feeding belt 91 is wound around the transmission wheel, the transmission wheel is rotationally connected to the feeding frame 92, and the feeding motor is installed on the feeding frame 92. The output end of the feeding motor is connected to one of the transmission wheels through a belt pulley and a belt. The feeding motor can drive the transmission wheel to rotate through the belt pulley, thereby driving the feeding belt 91 to operate. The bottom of the feeding frame 92 is provided with a bottom support for fixing the support cylinder 93. The output end of the support cylinder 93 is fixedly connected to a support plate 94. A limiting cylinder 95 is arranged on one side of the bottom support, and the output end of the limiting cylinder 95 is fixedly connected to a material blocking frame 96. The support frame 75 can be limited by the material blocking frame 96 during movement with the feeding belt 91, thereby limiting the position of the support frame 75. Then, the support plate 94 is lifted by the support cylinder 93, and the entire support frame 75 can be driven by the support plate 94 to separate from the feeding belt 91.

[0043] Please refer to Figure 10 A method for using a battery pack double-sided spot welding mechanism, comprising the following steps:

[0044] Step one, battery pack loading: place the battery pack and nickel strip in the support frame 75, so that the nickel strip contacts the positive and negative poles of the battery cells in the battery pack, the support frame 75 is placed at one end of the feeding belt 91, the feeding motor drives the feeding belt 91 to run through the transmission wheel, the support frame 75 moves with the feeding belt 91, the limiting air cylinder 95 drives the material blocking frame 96 to move up, after the support frame 75 is blocked by the material blocking frame 96, the supporting air cylinder 93 pushes the supporting plate 94 upwards, and the support frame 75 is lifted by the supporting plate 94;

[0045] Step two, clamping and fixing: the pre-pressing cylinder 72 drives the pre-pressing support 71 to move down, the outer sleeve 73 is sleeved on the conical sleeve 74, after the pre-pressing support 71 completely fits on the top of the support frame 75, the output end of the air jet pump 82 is connected with the cavity inside the support frame 75 through the pipeline, the outer sleeve 73 and the conical sleeve 74, and at the same time, the position of the support frame 75 is adjusted by the cooperation of the outer sleeve 73 and the conical sleeve 74 during the downward movement of the pre-pressing support 71, then the clamping air cylinder 62 drives the two fixed clamping jaws 63 to move close to each other to fix and clamp the support frame 75;

[0046] Step three, pre-welding treatment: before welding, the translation motor 22 drives the translation lead screw 21 to rotate, and the translation lead screw 21 cooperates with the translation table 23 to drive the entire position adjusting assembly 3 to move along the axis direction of the translation lead screw 21, and at the same time, the lifting air cylinder 32 drives the air cylinder support 34 to move up and down, so that the laser welding gun 4 is on the two sides of the support frame 75 and waits for welding, then the air jet pump 82 delivers inert gas into the cavity of the support frame 75 through the conical sleeve 74 and the outer sleeve 73, and finally the inert gas is sprayed out from the air outlet 81, the welding position reserved for the spot welding groove 8 is blown, and impurities are removed, and the oxygen content in the air around the spot welding groove 8 is reduced;

[0047] Step four, double-sided welding: when welding, the push-moving table 36 is pushed close to the support frame 75 by the push-moving cylinder 35, the outer supporting ring 57 is moved by the limiting frame 58 in the process that the head of the laser welding gun 4 approaches the spot welding notch 8, the cleaning ring 56 is separated from the filter screen 55 while the tension spring 59 is stretched, the welding head of the laser welding gun 4 penetrates the spot welding notch 8 to carry out spot welding, the metal atoms between the nickel strip and the pole of the battery cell form metallurgical bonding, the single-point welding is completed, the air in the mounting ring 52 is pumped out by the air pump 53, the external air is pumped into the mounting ring 52 from the air pumping groove 54 after the negative pressure is generated in the mounting ring 52, and the harmful gas generated in the spot welding notch 8 during welding and the small splashes are carried out by the airflow output generated by the air jet pump 82 and passing through the air outlet 81, the harmful gas passes through the filter screen 55 and enters the mounting ring 52, and the small splashes are intercepted by the filter screen 55, the unidirectional airflow generated in the whole process can carry out forced air cooling on the welding position, the cooling is accelerated, the battery pack is prevented from being damaged due to overheat of the battery cell caused by continuous welding, the push-moving cylinder 35 drives the laser welding gun 4 to return to the original position after the single-point welding is completed, the spring 59 pulls the outer supporting ring 57 close to the mounting ring 52 in the returning process, the small impurities intercepted on the filter screen 55 are cleaned by the cleaning ring 56 in the process, the filter screen 55 is prevented from being blocked, then the translation assembly 2 and the position adjusting assembly 3 are matched to sequentially weld all welding positions.

[0048] The above-described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A double-sided spot welding mechanism for a battery pack, comprising an upper support, characterized in that: The upper support is provided with a translation component, the translation component is symmetrically provided with a position adjustment component, the position adjustment component is equipped with a laser welding gun and a welding processing component, and the bottom of the upper support is provided with a clamping component. The clamping assembly includes a lower support fixed to the bottom of the upper support. A prepositioning assembly is provided on the lower support. The prepositioning assembly includes a pre-compression bracket slidably connected to the lower support. The output end of a pre-compression cylinder is fixedly connected to the pre-compression bracket, and the pre-compression cylinder is fixed to the lower support. A positioning mechanism is installed on the pre-compression bracket. A clamping cylinder is installed on the lower support, and a fixed gripper is fixedly connected to the output end of the clamping cylinder. The positioning mechanism includes an outer sleeve fixed in a groove in the side wall of the pre-compression bracket. The outer sleeve is fitted onto a conical sleeve, and the conical sleeve is fixed to the top of the support frame. Welded slots are evenly opened on the side wall of the support frame, and air outlets are opened on the side wall of the welded slots. The air outlets are interconnected with the conical sleeve. Air pumps are symmetrically arranged on both sides of the top of the pre-compression bracket, and the output end of the air pump is connected to the outer sleeve through a pipe. The welding processing assembly includes a connecting frame fixed on the translation assembly, an installation ring fixedly installed on the connecting frame, an air pump connected to the top of the installation ring via a pipe, air extraction grooves evenly opened on the inner wall of the installation ring, and a filter screen installed at the part of the air extraction groove on the inner wall of the installation ring, and a self-cleaning structure provided in the installation ring. The self-cleaning structure includes a cleaning ring slidably connected in the mounting ring, a cleaning ring fixedly mounted on an outer support ring, and a limit frame provided on the cleaning ring. Springs are symmetrically mounted on the outer support ring, one end of each spring is fixed to a connecting frame. The support frame is located on a feeding belt, the feeding belt is wound around a transmission wheel, the transmission wheel is rotatably connected to a feeding frame, and a feeding motor is mounted on the feeding frame. The output end of the feeding motor is connected to one of the transmission wheels via a pulley and a belt. A bottom bracket is provided at the bottom of the feeding frame, a support cylinder is installed in the bottom bracket, and a support plate is fixedly connected to the output end of the support cylinder. A limit cylinder is provided on one side of the bottom bracket, and a stop frame is fixedly connected to the output end of the limit cylinder.

2. The battery pack double-sided spot welding mechanism according to claim 1, characterized in that: The translation component includes a translation screw rotatably connected to the upper support. One end of the translation screw is fixedly connected to a translation motor, which is fixed to the upper support. A translation stage is slidably connected to the upper support, and the translation stage is connected to the translation screw.

3. The battery pack double-sided spot welding mechanism according to claim 2, characterized in that: The position adjustment assembly includes a support platform mounted on a translation platform, a lifting cylinder fixedly connected to the support platform, and the output end of the lifting cylinder fixedly connected to a mounting bracket.

4. The battery pack double-sided spot welding mechanism according to claim 3, characterized in that: The mounting bracket has cylinder brackets symmetrically installed on both sides of its bottom. The cylinder brackets are fixedly connected to the connecting frame and the air pump. A push cylinder is fixed in the cylinder bracket, and the output end of the push cylinder is fixedly connected to the push platform. The laser welding gun is fixed on the push platform.

5. A method of using a battery pack double-sided spot welding mechanism, based on the battery pack double-sided spot welding mechanism of claim 4, characterized in that, Includes the following steps: Step 1, Battery Pack Loading: Place the battery pack and nickel strip in the support frame, so that the nickel strip contacts the positive and negative terminals of the battery cells in the battery pack. The support frame is placed at one end of the feeding belt. The feeding motor drives the feeding belt to rotate through the transmission wheel. As the support frame moves with the feeding belt, the limit cylinder drives the baffle to move upward. After the support frame is blocked by the baffle, the support cylinder pushes the support plate upward, and the support frame is lifted by the support plate. Step 2, clamping and fixing: The pre-compression cylinder drives the pre-compression bracket to move down, and the outer sleeve is put on the conical sleeve. After the pre-compression bracket is completely attached to the top of the support frame, the output end of the jet pump is connected to the cavity inside the support frame through the pipe, the outer sleeve and the conical sleeve. At the same time, during the downward movement of the pre-compression bracket, the position of the support frame is adjusted by the cooperation of the outer sleeve and the conical sleeve. Then, the clamping cylinder drives the fixing claws on both sides to come closer to each other to fix and clamp the support frame. Step 3, Pre-welding treatment: Before welding, the translation motor drives the translation screw to rotate. With the cooperation of the translation screw and the translation table, the entire position adjustment assembly moves along the axis of the translation screw. At the same time, the lifting cylinder drives the cylinder bracket to move up and down, so that the laser welding gun is on both sides of the support frame waiting for welding. Then, the jet pump delivers inert gas to the cavity of the support frame through the conical sleeve and the outer sleeve. Finally, it is sprayed out from the air outlet to blow air on the reserved welding position of the spot welding groove, remove impurities, and reduce the oxygen content in the air around the spot welding groove. Step 4, Double-sided welding: During welding, the pusher cylinder pushes the pusher table closer to the support frame. As the laser welding gun head approaches the spot welding groove, the limit frame moves the outer support ring, stretching the spring and simultaneously causing the cleaning ring to detach from the filter screen. The welding head of the laser welding gun passes through the spot welding groove to perform spot welding, forming a metallurgical bond between the metal atoms of the nickel strip and the battery cell electrode. After completing the single-point welding, the air pump extracts the air from the mounting ring. The negative pressure generated in the mounting ring draws external air from the air extraction groove into the mounting ring. At the same time, the jet pump outputs airflow again, which rushes through the air outlet, cleaning the area where the welding was performed. Harmful gases and tiny spatter generated in the spot welding groove are carried out. The harmful gases pass through the filter screen and enter the mounting ring, while the tiny spatter is intercepted by the filter screen. The unidirectional airflow generated throughout the process can force-cool the welding parts, accelerate the cooling, and prevent the cells in the battery pack from overheating and being damaged due to continuous welding. Afterwards, the push cylinder drives the laser welding gun to return to its position. During the return process, the spring pulls the outer support ring close to the mounting ring. During this process, the cleaning ring scrapes away the tiny impurities intercepted on the filter screen to prevent the filter screen from becoming clogged. Then, in conjunction with the translation component and the position adjustment component, all welding parts are welded sequentially.

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