A method and device for preventing head striking and virtual welding in welding of lithium battery module pole and bus bar

Abstract

The present application relates to battery module welding equipment and method technical field, especially a kind of lithium battery module pole and busbar welding method and equipment for preventing head virtual welding, including defining the standard distance between the center point of the Mark point of the upper left corner of module and the left reference edge of the photographing hole of the upper left corner module welding Mark point as D1;Define the actual distance between the center point of the Mark point of the upper left corner of module and the left reference edge of the photographing hole of the upper left corner module welding Mark point as D2, offset is recorded as D, the absolute value of offset is recorded as |D|, |D|=|D2-D1|, when |D| is greater than process setting parameter during welding, equipment alarm stops and terminates welding, when |D| is less than or equal to process setting parameter, welding equipment welds and releases.This application can judge whether the module is offset before welding, when the offset exceeds the process allowable range, alarm stops in time, avoid welding robot to continue welding, effectively reduce the problem such as head, partial welding caused by module position offset.

Description

Technical Field

[0001] This invention relates to the technical field of battery module welding equipment and methods, and in particular to a method and equipment for preventing false solder joints during welding of lithium battery module terminals and busbars. Background Technology

[0002] For module welding stations, due to the diversity of products, the compatibility of welding station equipment must also be improved. Currently, many modules are welded using a single pressure head or staggered pressure heads to achieve compatibility. However, process protection measures are neglected. The phenomenon of misaligned welding pressure head caused by the displacement of the module relative to the welding tray, as well as the problem of poor welding caused by the difference in the polarity of the four terminals of the leftmost and rightmost cells in the length direction of the module, have become manufacturing pain points, resulting in product scrap and wasted time for manual rework. Summary of the Invention

[0003] The purpose of this invention is to solve one of the problems pointed out in the background art, and to propose a method and equipment for preventing solder joint failure when welding the terminals and busbars of lithium battery modules.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method and equipment for preventing false soldering during welding of lithium battery module terminals and busbars, the equipment including an A welding station frame and a welding robot, the A welding station frame being equipped with a circumferential positioning mechanism capable of positioning the module in the width and length directions, and a top positioning mechanism capable of applying pressure to the CCS integration, the top positioning mechanism including a module welding pressure head capable of applying pressure to the bar sheet, and a module welding mark point imaging hole, the module welding pressure head having a circular hole, and the module having module end plate mark points at the four corners;

[0006] The method includes: defining the standard distance between the center point of the upper left corner Mark point of the module and the left reference edge of the photographing hole of the upper left corner module welding Mark point as D1; ​​defining the actual distance between the center point of the upper left corner Mark point of the module and the left reference edge of the photographing hole of the upper left corner module welding Mark point as D2, the offset is recorded as D, the absolute value of the offset is recorded as |D|, |D|=|D2-D1|, during welding, when |D| is greater than the process setting parameter, the equipment alarms and stops and terminates welding, when |D| is less than or equal to the process setting parameter, the welding equipment welds and releases.

[0007] This invention proposes a method and equipment for preventing head-bumping and poor welding during the welding of lithium battery module terminals and busbars. The beneficial effects are as follows: This invention achieves stable positioning of the module and CCS integration through the cooperation of a circumferential positioning mechanism and a top positioning mechanism on the A welding station frame. It also utilizes the module welding Mark point imaging hole to detect the position of the module end plate Mark point and calculates the offset between the standard spacing D1 and the actual spacing D2. This allows for the determination of whether the module has shifted position before welding. When the offset exceeds the allowable process range, an alarm is triggered and the machine is stopped in time, preventing the welding robot from continuing to weld. This effectively reduces head-bumping and off-center welding problems caused by module position shifting, improves welding reliability, reduces product scrap and manual rework, and solves the technical problem of off-center welding and head-bumping caused by module displacement relative to the welding tray in the background technology. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall assembly of the welding station of the present invention;

[0009] Figure 2 This is a schematic diagram of the assembly of the welding galvanometer and ranging system of the present invention;

[0010] Figure 3 This is a schematic diagram of the welding clamping system assembly of the present invention;

[0011] Figure 4 This is a schematic diagram of the welding and pressing quick-change tray assembly of the present invention;

[0012] Figure 5 This is a schematic diagram of the assembly of the busbar module and the welding tray without installation according to the present invention;

[0013] Figure 6 This is a schematic diagram of the assembly of the busbar module and the welding tray of the present invention;

[0014] Figure 7 This is a top view schematic diagram of the welding pressure plate clamping module of the present invention;

[0015] Figure 8 This is a partial schematic diagram of the top view of the welding head pressing module on the left side of the module of the present invention (in the normal position of the module relative to the tray);

[0016] Figure 9 This is a partial schematic diagram of the top view of the welding head pressing module on the left side of the module of the present invention (in an abnormal position relative to the tray);

[0017] Figure 10 This is a partial structural schematic diagram of a pallet lifting mechanism according to one embodiment of the present invention;

[0018] Figure 11 This is a partial structural diagram of the module welding pressure head distribution according to one embodiment of the present invention;

[0019] Figure 12 This is a partial structural schematic diagram of a circumferential positioning mechanism according to one embodiment of the present invention;

[0020] Figure 13 This is a partial structural diagram of the pallet support and lifting plate positions according to one embodiment of the present invention;

[0021] Figure 14 This is a schematic diagram of the module welding pressure head structure according to one embodiment of the present invention;

[0022] Figure 15 This is a cross-sectional structural diagram of the module welding pressure head according to one embodiment of the present invention.

[0023] In the diagram: Welding Station A 1, Welding Station B 2, Welding Six-Axis Robot 3, Welding Galvanometer and Distance Measuring System 4, Welding Station A Frame 5, Welding Station A Pallet Lifting Mechanism 10, Pallet and Module Structure 100, Module Length Direction Limiting Block 105, Module Width Direction Single-Sided Fixed Limiting Block 110, Module End Plate 115, Module End Plate Mark Point 120, Bar Plate Upper Surface 125, Battery Cell Terminal Top Bar Plate Observation Hole 130, Pallet Support 135, Module Width Direction Single-Sided Movable Limiting Block 140, Battery Cell Terminal 145, CCS Integration 150, Module 160, Pressing and Dust Removal Structure 200, Welding Pressing Support Column 205, Welding Pressure Plate Fixing Plate 210, Welding 215, 220, 225, 230, 235, 235, 250, 250, 250, 250, 250, 300, 300, 400, 405, 410, 410, 415, 420, 425, 425, 1001, 1002, 1003, 1004, 1005, 1006, 1006, 270, 2351, 2352, 2353, 2354. Detailed Implementation

[0024] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Other technical solutions obtained by those skilled in the art without inventive effort are all within the protection scope of this application. Furthermore, it should be understood that terms indicating orientation or positional relationship, such as "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Reference Figures 1-15 A method and equipment for preventing false welding of lithium battery module terminals and busbars, the equipment includes an A welding station frame 5 and a welding robot. The A welding station frame 5 is equipped with a circumferential positioning mechanism that can position the module 160 in the width and length directions, and a top positioning mechanism that can apply pressure to the CCS integration 150. The top positioning mechanism includes a module welding pressure head 235 that can apply pressure to the Bar sheet and a module welding Mark point photographing hole 230. The module welding pressure head 235 has a round hole, and the module 160 has module end plate Mark points 120 at the four corners.

[0026] The method includes: defining the standard distance between the center point of the upper left corner Mark point 120 of module 160 and the left reference edge of the upper left corner module welding Mark point photography hole 230 as D1; ​​defining the actual distance between the center point of the upper left corner Mark point 120 of module 160 and the left reference edge of the upper left corner module welding Mark point photography hole 230 as D2, the offset is recorded as D, the absolute value of the offset is recorded as |D|, |D|=|D2-D1|, during welding, when |D| is greater than the process setting parameter, the equipment alarms and stops and terminates welding, when |D| is less than or equal to the process setting parameter, the welding equipment welds and releases.

[0027] refer to Figures 7-9During operation, module 160 is placed on the frame 5 of welding station A. The circumferential positioning mechanism positions module 160 in both width and length directions, while the top positioning mechanism applies pressure to the CCS integration 150, causing the module welding head 235 to press against the bar plate, ensuring the stability of the CCS integration 150 during welding. Before welding, the welding robot captures the position of the Mark point 120 on the upper left corner of the module end plate through the module welding Mark point photographing hole 230, and obtains the actual distance D2. This is compared with the pre-calibrated standard distance D1, and the absolute value of the offset |D| is calculated. When |D| is greater than the process setting parameter, it indicates that module 160 has a positional offset relative to the welding station, which may easily lead to welding head or welding position deviation. The equipment will alarm, stop, and terminate welding. When |D| is less than or equal to the process setting parameter, it indicates that module 160 is within the allowable positioning accuracy range, and the welding equipment will execute subsequent welding processes, thus achieving pre-welding position verification.

[0028] The method also includes: before welding the battery cell terminal 145 of module 160 to the corresponding Bar plate of the observation hole 130 on the top of the battery cell terminal, the welding robot will test the height distance between the upper surface 125 of the Bar plate corresponding to the observation hole 130 on the top of the four battery cell terminal at the four corners of module 160 and the welding robot rangefinder. The four heights are recorded as H1, H2, H3, and H4 respectively. The range of the four parameters H1, H2, H3, and H4 is recorded as H. H is compared with the equipment process parameters. When H is greater than the set value of the equipment process parameters, the equipment alarms and stops and terminates welding. When H is less than or equal to the set value of the process parameters, the welding equipment welds and releases the equipment.

[0029] After completing the position verification of module 160, the welding robot measures the distance to the upper surface 125 of the Bar plate corresponding to the observation hole 130 on the top of the four cell terminals at the four corners of module 160 before formal welding. The height distance between the four positions and the welding robot's rangefinder is recorded as H1, H2, H3, and H4, respectively, and the range H of the four height parameters is calculated. Then, the range H is compared with the preset equipment process parameters. When H is greater than the set value of the equipment process parameters, it indicates that there is a large height difference on the upper surface 125 of the Bar plate at the four corners of module 160, which may easily lead to insufficient clamping at some positions or deviation of the welding focus during welding. The equipment alarms, stops, and terminates welding. When H is less than or equal to the set value of the equipment process parameters, it indicates that the height consistency of the upper surface 125 of the Bar plate at the four corners of module 160 meets the welding requirements, and the welding equipment executes the subsequent welding process.

[0030] Before welding, a welding robot inspects the height of the upper surface 125 of the Bar plate corresponding to the observation hole 130 on the top of the four corner cell terminals of module 160, and calculates the height difference H. Height consistency is used as the criterion for pre-welding judgment, allowing identification of abnormal states in module 160 caused by assembly errors, deformation, or height inconsistencies before welding. Welding is stopped promptly when the height difference exceeds the allowable process range, preventing insufficient clamping, incomplete welds, or inconsistent welding quality. This improves welding quality and product consistency, reduces product scrap and manual rework, and solves the problem of incomplete welds caused by the height differences of the four terminals of the leftmost and rightmost cells along the module's length in the background technology.

[0031] The module 160 of this device includes module end plates 115 located at both ends in the length direction. The four corners of the module end plates 115 have module end plate Mark points 120. The module end plate Mark points 120 are the photo addressing points of the welding robot. Before the CCS integration 150 is installed on the module 160, the electrode addressing station binds the module end plate Mark points 120 to each cell electrode post 145 of the module 160.

[0032] The circumferential positioning mechanism includes a pallet bracket 135 installed on the frame 5 of welding station A. The pallet bracket 135 is equipped with a module length direction limiting block 105, a module width direction single-sided fixed limiting block 110, and a module width direction single-sided movable limiting block 140. When the module 160 is installed, in the length direction of the pallet bracket 135, the module end plate 115 contacts the module length direction limiting block 105, and in the width direction of the pallet bracket 135, the side of the module 160 contacts the module width direction single-sided fixed limiting block 110 and the module width direction single-sided movable limiting block 140 respectively.

[0033] When installing module 160, module 160 is placed on tray bracket 135. In the length direction, it is positioned by contacting the module end plate 115 with the module length direction limiting block 105. In the width direction, the module 160 is limited on both sides by the module width direction single-sided fixed limit 110 and the module width direction single-sided movable limit 140, thereby completing the circumferential positioning of module 160 in the width and length directions, providing a stable and reliable installation reference for subsequent welding.

[0034] refer to Figure 2The welding robot includes a six-axis welding robot 3 and a welding galvanometer and ranging system 4. The six-axis welding robot 3 includes a six-axis welding robot end effector 300. The welding galvanometer and ranging system 4 includes two laser rangefinders 400, a welding vision device 405, a welding galvanometer and ranging system mounting bracket 410, a fiber optic cable bracket 415, a galvanometer 420, and a welding air knife 425. One end of the welding galvanometer and ranging system mounting bracket 410 is connected to the fiber optic cable bracket 415, the galvanometer 425, the welding air knife 425, and the two laser rangefinders 400, and the other end is securely connected to the six-axis welding robot end effector 300.

[0035] During operation, the welding six-axis robot 3 drives the welding six-axis robot end effector 300 to move, causing the welding galvanometer and ranging system 4 to move to the corresponding welding position. The welding vision system 405 is used to identify and position the welding location, while two laser rangefinders 400 detect the height information of the position to be welded. The galvanometer 420 controls the laser welding trajectory based on the positioning and ranging results to complete the welding. The welding air knife 425 is used to blow away the welding area, reducing the impact of welding fumes on ranging and vision recognition. The welding galvanometer and ranging system mounting bracket 410 integrates the fiber optic cable bracket 415, galvanometer 420, welding air knife 425, and two laser rangefinders 400 into a single unit and fixes it to the welding six-axis robot end effector 300, enabling each functional component to move synchronously with the welding six-axis robot 3, achieving integrated welding, positioning, and ranging operations.

[0036] refer to Figures 3-6 Welding station 1 includes a pressing and dust removal structure 200 installed on the welding station frame 5, and a welding station pallet lifting mechanism 10 installed on the welding station frame 5 and located below the pressing and dust removal structure 200. A pallet support 135 is provided between the welding station pallet lifting mechanism 10 and the pressing and dust removal structure 200. A circumferential positioning mechanism is installed on the pallet support 135, and a top positioning mechanism is installed on the pressing and dust removal structure 200. During operation, the welding station pallet lifting mechanism 10 lifts the pallet support 135 until the module 160 abuts against the pressing and dust removal structure 200.

[0037] During operation, module 160 is placed on pallet support 135. The pallet lifting mechanism 10 of welding station A drives pallet support 135 to move upward, lifting pallet support 135 together with circumferential positioning mechanism and module 160 until module 160 abuts against clamping and dust removal structure 200. Subsequently, the top positioning mechanism installed on clamping and dust removal structure 200 clamps and positions the CCS integration, providing a stable clamping state for subsequent welding. At the same time, clamping and dust removal structure 200 can collect fumes generated during welding, thereby improving welding stability and welding environment quality.

[0038] The equipment includes welding station A (station 1) and welding station B (station 2), with a welding robot located between them. Welding station A (station 1) and welding station B (station 2) are parallel stations. Setting up two stations improves the work cycle time.

[0039] The A welding station pallet lifting mechanism 10 includes a support plate 1006 fixed to the A welding station frame 5, and a lifting plate 1004 slidably connected to the support plate 1006 via a guide assembly 1003. The lifting plate 1004 is provided with a positioning pin 1005. A lifting power source 1001 is fixedly connected to the bottom of the support plate 1006, and the lifting head 1002 of the lifting power source 1001 is connected to the lifting plate 1004.

[0040] The lifting power source 1001, such as a lifting motor, drives the lifting plate 1004 to move up and down, and the lifting plate 1004 lifts the mechanism above it upward.

[0041] refer to Figures 10-15 The pressing and dust removal structure 200 includes a welded pressing support column 205, a welded pressing plate fixing plate 210, a welded pressing plate positioning column 215, a welded pressing plate quick-change guide 220, a welded dust removal mechanism 225, a module welding pressing head 235, and a quick-change pressing plate bracket 250. The welded pressing plate fixing plate 210 is fastened to the welded pressing support column 205, and the welded pressing plate quick-change guide 220 is fastened directly below the welded pressing plate fixing plate 210. The welded dust removal mechanism 225 and the module welding pressing head 235 are both fastened to the quick-change pressing plate bracket 250. The quick-change pressing plate bracket 250 and the welded pressing plate quick-change guide 220 are positioned and connected through the welded pressing plate positioning column 215.

[0042] During operation, the welding clamping support column 205 is used to support the welding pressure plate fixing plate 210. The welding pressure plate quick-change guide 220 is fixed below the welding pressure plate fixing plate 210. The quick-change pressure plate bracket 250 achieves quick positioning and installation through the welding pressure plate positioning column 215 and the welding pressure plate quick-change guide 220, so that the welding dust removal mechanism 225 and the module welding pressure head 235 can be installed or disassembled as a whole with the quick-change pressure plate bracket 250.

[0043] During the welding process, the module welding head 235 clamps and positions the CCS integration, while the welding dust removal mechanism 225 simultaneously collects the fumes generated in the welding area, thereby ensuring the stability of the clamping and positioning and improving the cleanliness of the welding area.

[0044] refer to Figure 14 , Figure 15The modular welding head 235 includes a housing body 2354, which has a chamber for the welding robot welding head to be inserted. The top and bottom of the chamber are open. The outer periphery of the housing body 2354 has a mounting part 2353, which is fixed to the quick-change pressure plate bracket 250. The bottom of the housing body 2354 has an outwardly protruding conical nozzle 2351, which can be used to press the bar sheet. The side of the housing body 2354 has a connecting pipe port 2352 that communicates with the chamber. The connecting pipe port 2352 is connected to a vacuum cleaner through a negative pressure pipe 270.

[0045] During operation, the module welding head 235 is fixed to the quick-change pressure plate bracket 250 via the mounting part 2353. The welding robot head is inserted into the chamber from the top of the shell body 2354 and extends to the welding position from the bottom opening of the shell body 2354. The protruding conical nozzle 2351 abuts against the bar piece and presses and positions it, ensuring a stable fit between the bar piece and the battery cell electrode. The welding robot head then welds the bar piece and the battery cell electrode through the chamber and bottom opening of the module welding head 235. The fumes generated during welding enter the inlet 2352 through the inner cavity of the shell body 2354 and are transported to the dust collection equipment through the negative pressure pipe 270 for collection. This allows for simultaneous bar piece pressing, welding, and fume collection, improving welding quality and the cleanliness of the welding area.

[0046] As one working embodiment: During operation, the module 160 is first placed on the pallet support 135. The module 160 abuts against the module length direction limiting block 105 through the module end plate 115 in the length direction, and is positioned in the width direction through the module width direction single-sided fixed limit 110 and the module width direction single-sided movable limit 140, so as to realize the circumferential positioning of the module 160 on the pallet support 135.

[0047] Subsequently, the tray lifting mechanism 10 of welding station A drives the tray support 135 to move upward, so that the module 160 abuts against the pressing and dust removal structure 200. The module welding pressure head 235 in the top positioning mechanism presses the Bar piece in the CCS integration 150, so that the Bar piece and the cell electrode 145 are in a stable fit, providing stable pressing conditions for welding.

[0048] Before the formal welding, the six-axis welding robot 3 moves the welding galvanometer and ranging system 4 to the inspection position. The welding vision system 405 identifies the position of the module end plate mark point 120 through the module welding mark point imaging hole 230, and obtains the actual distance D2 between the upper left corner module end plate mark point 120 and the left reference edge of the upper left corner module welding mark point imaging hole 230. It compares this distance with the pre-calibrated standard distance D1 and calculates the absolute value of the offset |D|. When |D| is greater than the process setting parameter, it indicates that the module 160 has shifted position relative to the welding station. The equipment immediately alarms, stops, and terminates welding to prevent the welding robot from continuing to weld and causing abnormalities such as heading or misalignment. When |D| is less than or equal to the process setting parameter, the next inspection step is initiated.

[0049] Subsequently, two laser rangefinders 400 respectively measure the height of the upper surface 125 of the Bar piece corresponding to the observation hole 130 on the top of the four corner battery cell terminals of module 160, obtaining four height parameters H1, H2, H3, and H4, and calculating the height range H. When H is greater than the set value of the equipment process parameters, it indicates that the height consistency of the four corner Bar pieces of module 160 does not meet the welding requirements, which may easily lead to poor adhesion between the Bar piece and the battery cell terminal 145. The equipment will alarm and stop, terminating the welding process to avoid false welding. When H is less than or equal to the set value of the equipment process parameters, it indicates that the height of the Bar piece meets the welding requirements, and the welding six-axis robot 3 continues to perform the welding process.

[0050] During the welding process, the welding robot's welding head passes through the chamber and bottom opening of the module welding head 235 to perform laser welding on the bar piece and the battery cell electrode 145. The outwardly protruding conical nozzle 2351 continuously presses the bar piece to ensure that it remains in contact throughout the welding process. The welding fumes enter the inlet 2352 through the inner cavity of the shell body 2354 and are transported to the dust collection equipment through the negative pressure pipe 270 for collection. At the same time, the welding air knife 425 blows away the welding area to reduce the impact of fumes on the detection accuracy of the welding vision 405 and the laser rangefinder 400. This achieves integrated operation of pre-welding position verification, pre-welding height verification, stable bar piece pressing, laser welding, and fume collection during the module welding process. It effectively avoids welding head defects and off-center welding caused by module position misalignment, as well as incomplete welding caused by inconsistent bar piece height, thus improving welding quality and product consistency.

[0051] The above are merely typical specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any technical solutions, concepts, and designs obtained by those skilled in the art by making equivalent substitutions or changes based on the technical solutions and inventive concepts of this application within the scope of the technology disclosed in this application should be covered within the scope of protection of this application.

Claims

1. A method and apparatus for preventing a false start and a virtual welding of a lithium battery module pole and busbar welding, characterized in that, The equipment includes an A welding station frame (5) and a welding robot. The A welding station frame (5) is equipped with a circumferential positioning mechanism that can position the module (160) in the width and length directions, and a top positioning mechanism that can apply pressure to the CCS integration (150). The top positioning mechanism includes a module welding pressure head (235) that can apply pressure to the Bar sheet and a module welding Mark point photographing hole (230). The module welding pressure head (235) has a round hole, and the module (160) has module end plate Mark points (120) at its four corners. The method includes: defining the standard distance between the center point of the upper left corner Mark point (120) of module (160) and the left reference edge of the upper left corner module welding Mark point photography hole (230) as D1; ​​defining the actual distance between the center point of the upper left corner Mark point (120) of module (160) and the left reference edge of the upper left corner module welding Mark point photography hole (230) as D2, the offset is recorded as D, the absolute value of the offset is recorded as |D|, |D|=|D2-D1|, during welding, when |D| is greater than the process setting parameter, the equipment alarms and stops and terminates welding, when |D| is less than or equal to the process setting parameter, the welding equipment welds and releases.

2. The method and equipment for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 1, characterized in that, The method further includes: before welding the battery cell pole (145) of the module (160) to the corresponding Bar plate of the observation hole (130) on the top of the battery cell pole, the welding robot will test the height distance between the upper surface (125) of the Bar plate corresponding to the observation hole (130) on the top of the four battery cell poles at the four corners of the module (160) and the welding robot rangefinder. The four heights are recorded as H1, H2, H3, and H4 respectively. The range of the four parameters H1, H2, H3, and H4 is recorded as H. H is compared with the equipment process parameters. When H is greater than the set value of the equipment process parameters, the equipment alarms and stops and terminates welding. When H is less than or equal to the set parameters, the welding equipment welds and releases the equipment.

3. A method and apparatus for preventing solder joint failure during welding of lithium battery module terminals and busbars according to any one of claims 1-2, characterized in that, The module (160) includes module end plates (115) located at both ends in the length direction. The module end plates (115) have module end plate Mark points (120) at the four corners. The module end plate Mark points (120) are the addressing points for the welding robot to take pictures. Before the CCS integration (150) is installed on the module (160), the pole addressing station binds the module end plate Mark points (120) to each cell pole (145) of the module (160).

4. The method and equipment for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 3, characterized in that, The circumferential positioning mechanism includes a tray bracket (135) installed on the A welding station frame (5), and the tray bracket (135) is equipped with a module length direction limiting block (105), a module width direction single-sided fixed limiting block (110), and a module width direction single-sided movable limiting block (140). When the module (160) is installed, in the length direction of the pallet support (135), the end plate (115) of the module (160) contacts the module length direction limiting block (105), and in the width direction of the pallet support (135), the side of the module (160) contacts the module width direction single-sided fixed limit (110) and the module width direction single-sided movable limit (140) respectively.

5. The method and equipment for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 1, characterized in that, The welding robot includes a six-axis welding robot (3) and a welding galvanometer and ranging system (4). The six-axis welding robot (3) includes a welding six-axis robot end effector (300). The welding galvanometer and ranging system (4) includes two laser rangefinders (400), a welding vision device (405), a welding galvanometer and ranging system mounting bracket (410), a fiber optic cable bracket (415), a galvanometer (420), and a welding air knife (425). One end of the welding galvanometer and ranging system mounting bracket (410) is connected to the fiber optic cable bracket (415), the galvanometer (420), the welding air knife (425), and the two laser rangefinders (400), and the other end is securely connected to the welding six-axis robot end effector (300).

6. The method and equipment for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 1, characterized in that, The A welding station (1) includes a pressing and dust removal structure (200) installed on the A welding station frame (5) and an A welding station pallet lifting mechanism (10) installed on the A welding station frame (5) and located below the pressing and dust removal structure (200). A pallet support (135) is provided between the A welding station pallet lifting mechanism (10) and the pressing and dust removal structure (200). The circumferential positioning mechanism is installed on the pallet support (135), and the top positioning mechanism is installed on the pressing and dust removal structure (200). During operation, the A welding station pallet lifting mechanism (10) lifts the pallet support (135) until the module (160) abuts against the pressing and dust removal structure (200).

7. The method and equipment for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 6, characterized in that, The equipment includes welding station A (1) and welding station B (2), and the welding robot is located between welding station A (1) and welding station B (2). Welding station A (1) and welding station B (2) are parallel stations.

8. A method and apparatus for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 6, characterized in that, The A welding station pallet lifting mechanism (10) includes a support plate (1006) fixed to the A welding station frame (5) and a lifting plate (1004) slidably connected to the support plate (1006) via a guide assembly (1003). The lifting plate (1004) is provided with a positioning pin (1005). A lifting power source (1001) is fixedly connected to the bottom of the support plate (1006). The lifting head (1002) of the lifting power source (1001) is connected to the lifting plate (1004).

9. A method and apparatus for preventing solder joint failure when welding terminals and busbars of a lithium battery module according to claim 6, characterized in that, The pressing and dust removal structure (200) includes a welding pressing support column (205), a welding pressure plate fixing plate (210), a welding pressure plate positioning column (215), a welding pressure plate quick-change guide (220), a welding dust removal mechanism (225), a module welding pressure head (235), and a quick-change pressure plate bracket (250). The welding pressure plate fixing plate (210) is fastened to the welding pressing support column (205), and the welding pressure plate quick-change guide (220) is fastened directly below the welding pressure plate fixing plate (210). The welding dust removal mechanism (225) and the module welding pressure head (235) are both fastened to the quick-change pressure plate bracket (250). The quick-change pressure plate bracket (250) and the welding pressure plate quick-change guide (220) are positioned and connected by the welding pressure plate positioning column (215).

10. A method and apparatus for preventing solder joint failure during welding of lithium battery module terminals and busbars according to claim 9, characterized in that, The module welding head (235) includes a shell body (2354), which has a chamber for the welding robot welding head to be inserted. The top and bottom of the chamber are open. The outer periphery of the shell body (2354) has a mounting part (2353), which is fixed to the quick-change pressure plate bracket (250). The bottom of the shell body (2354) has an outwardly protruding conical nozzle (2351), which can be used to press the bar sheet. The side of the shell body (2354) has a connecting pipe (2352) that connects to the chamber. The connecting pipe (2352) is connected to a vacuum cleaner through a negative pressure pipe (270).

Images