Welding tool and welding device

Abstract

The utility model discloses a welding tool and a welding device. The welding tool comprises a base, a driving assembly, a limiting assembly and a detecting assembly. The base is used for placing a plurality of single batteries to be welded; the driving assembly is arranged on the base; the limiting assembly is connected with the driving assembly, and the limiting assembly is used for pressing the busbar on the single battery and allowing the welder to weld; the detection assembly is connected with the driving assembly, and the detection assembly is used for detecting the welding position between the busbar and the single battery; wherein the distance between the contact position of the limiting assembly and the busbar and the contact position of the detection assembly and the busbar is an avoiding distance L, the avoiding distance L is N times of the distance between the adjacent single battery pole columns, and N is a positive integer. According to the welding device, when the bus bar and the pole of the single battery at one position are welded through the limiting assembly, the detection assembly can synchronously detect whether the welding position of the bus bar and the pole at the other position has missing welding or insufficient welding or not.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling, and in particular to a welding tooling and a welding device. Background Art

[0002] Laser welding is widely used in the lithium battery industry and has become a key process in the production of lithium battery products. Welding quality directly affects product quality. Laser welding is prone to quality issues such as cold welds, weld penetrations, and weld leaks. Integrating welding quality detection functions at welding stations allows for rapid identification and repair of anomalies, ensuring product quality and production efficiency.

[0003] However, current welding equipment does not have welding detection functions, and the defects cannot be detected. Defective products flow to the subsequent processes. When quality problems are found, they have to be returned for re-loading and welding, which affects efficiency. Summary of the Invention

[0004] An object of the present invention is to provide a welding tool and a welding device, which are intended to solve the technical problem that welding equipment does not have welding detection capabilities.

[0005] To achieve the above-mentioned purpose, the present invention provides a solution: a welding tool, which includes a base, a drive assembly, a limiting assembly and a detection assembly; the base is used to place multiple single cells to be welded; the drive assembly is arranged on the base; the limiting assembly is connected to the drive assembly, and the limiting assembly is used to press the busbar on the single cell and provide welding for the welder; the detection assembly is connected to the drive assembly, and the detection assembly is used to detect the weld between the busbar and the single cell; wherein, the distance between the contact point of the limiting assembly and the busbar and the contact point of the detection assembly and the busbar is the avoidance distance L, and the avoidance distance L is N times the spacing between adjacent single cell poles, and N is a positive integer.

[0006] Optionally, the detection component includes an air pipe and a suction cup, the air pipe and the suction cup are connected, the air pipe is used to connect with the air pump, and the suction cup is used to cover the welding position.

[0007] Optionally, the detection component further includes a switch and a detector. The switch is connected to the trachea, the switch is used to control the conduction of the trachea, and the detector is connected to the trachea, and the detector is used to detect the air pressure in the trachea.

[0008] Optionally, the air pipe includes a main line and at least two auxiliary lines, the at least two auxiliary lines are respectively connected to the main line, the main line is used to communicate with the air pump, the number of suction cups is at least two, the at least two suction cups are respectively connected to the at least two auxiliary lines, and the at least two suction cups are used to respectively cover the welding points of the positive pole and the negative pole of the single battery.

[0009] Optionally, the suction cup includes a transition end and a buffer portion connected to each other, the transition portion is connected to the air pipe, the transition portion is provided with a channel connected to the air pipe, the buffer portion is provided with a working chamber connected to the channel, the buffer portion is used to cover the welding position, and the buffer portion is folded.

[0010] Optionally, the driving assembly includes a first driving structure, a second driving structure, a third driving structure and a working seat, the second driving structure is connected to the first driving structure, the third driving structure is connected to the second driving structure, the working seat is connected to the third driving structure, and the limiting assembly and the detection assembly are respectively connected to the working seat; wherein, the first driving structure is used to drive the second driving structure to move along the first direction, the second driving structure is used to drive the third driving structure to move along the second direction, and the third driving structure is used to drive the working seat to move along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0011] Optionally, the working seat is provided with a limiting cavity, and the working seat is used to limit the single battery when moving along the first direction.

[0012] Optionally, the limiting component includes a pressing sleeve, an elastic member and a fastener, the elastic member is arranged between the pressing sleeve and the working seat, the fastener passes through the working seat and the elastic member in sequence, and is connected to the pressing sleeve, the pressing sleeve is used to elastically support the bus, and the pressing sleeve is provided with a through welding bead.

[0013] Optionally, the working seat is provided with a working hole, and part of the pressing sleeve is confined in the working hole.

[0014] To achieve the above object, the present invention provides a solution: a welding device, which includes: a welder and any one of the welding tools as described above, wherein the welder is used to weld the busbar and the single battery together through the welding tool.

[0015] The beneficial effects of the present invention are:

[0016] The driving assembly is arranged on the base, and the driving assembly is used to provide power to transport the limiting assembly and the detection assembly toward the single cell during welding. The limiting assembly is used to press the busbar onto the single cell, specifically onto the pole of the single cell, and to provide welding for the welder. The detection assembly is connected to the driving assembly, and the detection assembly is used to detect the weld between the busbar and the single cell to determine whether there is a cold weld or a leaky weld. The distance between the contact point between the limiting assembly and the busbar and the contact point between the detection assembly and the busbar is the avoidance distance L, and the avoidance distance L is N times the spacing between adjacent single cell poles, where N is a positive integer. In this way, when the welder is welding a busbar and a pole at one place, the detection assembly can simultaneously detect the weld between the busbar and the pole at another place. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of the welding tool provided by an embodiment of the present invention;

[0019] Figure 2 The embodiment of the present invention provides Figure 2 A partial enlarged schematic diagram of area A in the middle;

[0020] Figure 3 1 is a front view schematic diagram of a welding tool provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the suction cup and the welding point provided by an embodiment of the present invention;

[0022] Figure 5 is a cross-sectional schematic diagram of a welding tool provided in an embodiment of the present invention;

[0023] Figure 6 The embodiment of the present invention provides Figure 5 A partial enlarged schematic diagram of area B in the middle.

[0024] Description of the accompanying drawings: single battery 000, bus bar 111, base 10, drive assembly 20;

[0025] A first driving structure 21, a second driving structure 22, a third driving structure 23, and a working seat 24;

[0026] Limiting cavity 241, working hole 242, limiting assembly 30, pressing sleeve 31, elastic member 32, fastener 33; detection assembly 40, air pipe 41, main line 412, auxiliary line 414, suction cup 42, transition end 421; buffer part 423, switch 43, detector 44. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] See also Figure 1 and Figure 2 As shown, Figure 1 is a structural diagram of a welding tool provided by an embodiment of the present invention, Figure 2 The embodiment of the present invention provides Figure 2 A partial enlarged schematic diagram of area A in the middle.

[0030] An embodiment of the present invention provides a welding device, which includes a welder and a welding tool. The welding tool is used to press the single cell 000 and the busbar 111 together. The welder is used to weld the busbar 111 and the single cell 000 together through the welding tool. The welding tool detects the welding points between the busbar 111 and the single cell 000 to prevent the occurrence of leaking welds or cold welds.

[0031] Specifically, the welding jig includes a base 10, a drive assembly 20, a limiting assembly 30, and a detection assembly 40. The base 10 is used to place multiple single cells 000 to be welded. The base 10 is the basic framework of the welding jig, supporting various components and making the welding jig a whole. The base 10 can be composed of a frame structure composed of multiple rods, a plate-like structure composed of multiple plates, or a hybrid structure composed of multiple rods and multiple plates. The drive assembly 20 is mounted on the base 10 and is used to provide power to transport the limiting assembly 30 and the detection assembly 40 toward the single cells 000. Of course, the limiting assembly 30 and the detection assembly 40 can also be transported away from the single cells 000.

[0032] The limiting component 30 is connected to the driving component 20. The limiting component 30 is used to press the busbar 111 onto the single cell 000, specifically, to press the busbar 111 onto the pole of the single cell 000, and to provide welding for the welder. The welder can use laser welding. Under normal circumstances, the welder welds a ring-shaped weld mark between the busbar 111 and the pole. The detection component 40 is connected to the driving component 20. The detection component 40 is used to detect the weld between the busbar 111 and the single cell 000 to determine whether there is a cold weld or a leaking weld. The detection component 40 can use ultrasonic imaging to detect, specifically to image the weld to directly determine whether there is a cold weld or a leaking weld. The detection component 40 can also use air pressure detection to specifically detect the airtightness of the weld to indirectly determine whether there is a cold weld.

[0033] The distance between the contact point between the limiting assembly 30 and the busbar 111 and the contact point between the detection assembly 40 and the busbar 111 is a clearance distance L. The clearance distance L is N times the spacing between adjacent single-cell 000 poles, where N is a positive integer. This allows the detection assembly 40 to simultaneously detect the weld between the busbar 111 and the pole while the welder is welding one pole. N can be 1, 2, 3, 4, 5, 6, 7, 8, 9, and so on. For example, when N is 1, the pole corresponding to the limiting assembly 30 and the pole corresponding to the detection assembly 40 are adjacent. Thus, when the busbar 111 and the pole are welded, the detection assembly 40 can simultaneously detect the adjacent welded poles. For example, when N is 2, the pole corresponding to the limiting assembly 30 and the pole corresponding to the detection assembly 40 are separated by one pole, i.e., by one single-cell 000. For other numbers, the same applies and is not listed here.

[0034] In order to enable those skilled in the art to have a further understanding of the present invention, the welding process of the welding device will be explained in detail below, but it is worth noting that this does not impose any limitation on the technical solution of the present invention.

[0035] 1. Place multiple single cells 000 side by side on the base 10, and place the bus 111 on the top of the single cell 000, with the bus 111 facing the pole of the single cell 000; 2. The driving component 20 transports the limiting component 30 and the detection component 40 toward the single cell 000; 3. The limiting component 30 presses the bus 111 on the pole of the single cell 000 that has not been welded, and the detection component 40 is simultaneously aligned with other welds that have been welded; 4. The welder starts welding, and the detection component 40 simultaneously detects other welds; 5. If a leak or cold weld occurs at the detected weld, the driving component 20 will drive the limiting component 30 to return and re-weld it through the welder; if the detected weld is good, repeat steps 1 to 4 until all welds are completed.

[0036] In this embodiment, a drive assembly 20 is disposed on a base 10 and is used to provide power. During welding, the drive assembly 20 transports the limiting assembly 30 and the detection assembly 40 toward the single cell 000. The limiting assembly 30 is used to press the busbar 111 against the single cell 000, specifically against the pole of the single cell 000, and provides for welding by the welder. The detection assembly 40 is connected to the drive assembly 20 and is used to detect the weld between the busbar 111 and the single cell 000 to determine whether there is a cold weld or a leaky weld. The distance between the contact point between the limiting assembly 30 and the busbar 111 and the contact point between the detection assembly 40 and the busbar 111 is a clearance distance L. The clearance distance L is N times the spacing between the poles of adjacent single cells 000, where N is a positive integer. In this way, while the welder is welding one busbar 111 and pole, the detection assembly 40 can simultaneously detect the weld between another busbar 111 and pole.

[0037] See also Figures 1 to 4 As shown, Figure 3 : is a front view of a welding tool provided by an embodiment of the present invention, Figure 4 4 is a schematic diagram of the structure of the suction cup 42 and the welding point provided in an embodiment of the present invention.

[0038] The detection component 40 of this embodiment mainly uses air pressure detection. The detection component 40 includes an air pipe 41 and a suction cup 42. The air pipe 41 and the suction cup 42 are connected. The air pipe 41 is used to connect to the air pump, and the suction cup 42 is used to cover the weld. During the detection, the suction cup 42 will press against the bus 111 and cover the weld. The air pump starts to pump air from the air pipe 41 so that the suction cup 42 is in a vacuum state and close to the bus 111. After the air pump stops working, if air enters the suction cup 42 through the weld, the adsorption strength of the suction cup 42 and the bus 111 will decrease, and it can be determined that there is a leaky weld or a cold weld at the weld. After the air pump stops working, if air cannot enter the suction cup 42 through the weld, the adsorption strength of the suction cup 42 and the bus 111 will be maintained for a relatively long time, and it can be determined that there is no leaky weld or a cold weld at the weld.

[0039] It is worth noting that the air tube 41 can be a rigid tube. In this way, when the air pressure inside the air tube 41 changes, the air tube 41 itself will not deform and affect the air pressure inside the air tube 41. The suction cup 42 can be made of an elastic material, such as silicone, rubber, soft glue, sponge, etc. In this way, when the suction cup 42 is in a vacuum state, the suction cup 42 will deform and tightly adhere to the bus bar 111. When the air pressure inside the suction cup 42 changes, the suction cup 42 will slowly recover its deformation, thereby indirectly determining whether there is an air leak at the weld.

[0040] In this embodiment, the air pressure detection is achieved by combining the air pipe 41 and the suction cup 42 , which has a simple structure, a low failure rate, is easy to maintain, and has a low manufacturing cost.

[0041] Furthermore, the detection assembly 40 also includes a switch 43 and a detector 44. The switch 43 is connected to the air pipe 41. The switch 43 is used to control the conduction of the air pipe 41. That is, the switch 43 can cut off the passage between the air pipe 41 and the air pump, thereby preventing the air pump from being frequently turned on and off. The switch 43 can be a mechanical switch 43 or an electronic switch 43, such as a solenoid valve. The detector 44 is connected to the air pipe 41 and is used to detect the air pressure in the air pipe 41. The detector 44 can be a digital vacuum gauge. The air pressure in the air pipe 41 can be directly read by the detector 44 to determine the change in air pressure, thereby more accurately determining whether there is a cold weld or a leaky weld at the weld.

[0042] Specifically, the air pipe 41 includes a main line 412 and at least two secondary lines 414. The at least two secondary lines 414 are respectively connected to the main line 412, which is used to communicate with the air pump. There are at least two suction cups 42, each of which is connected to the at least two secondary lines 414. The at least two suction cups 42 are used to cover the welds of the positive and negative electrodes of the single battery 000. Each secondary line 414 is equipped with a suction cup 42, and each suction cup 42 can detect whether a welding spot on a terminal is leaking or poorly welded. The air pump first evacuates the air from the main line 412, then from the secondary lines 414, and finally from the suction cups 42, to achieve a vacuum in the entire passage.

[0043] In this embodiment, the detection component 40 can press the positive and negative electrodes on a single cell 000 at the same time and complete the detection of the single cell 000, or it can press the positive and negative electrodes on two single cells 000 and complete the detection of the two single cells 000, and so on, which are not described one by one, thereby improving the detection efficiency.

[0044] Optionally, the suction cup 42 includes a transition end 421 and a buffer portion 423 that are connected to each other. The transition portion is connected to the air pipe 41 and is provided with a channel communicating with the air pipe 41. The buffer portion 423 is provided with a working chamber communicating with the channel. The buffer portion 423 is used to cover the welding part and is folded. During testing, the air in the working chamber is evacuated to form a negative pressure environment. The buffer portion 423 will shrink along the fold under atmospheric pressure and adhere to the bus 111. The folded buffer portion 423 can be formed with one fold, or two folds or more folds, thereby forming a spring-like elastic effect to facilitate deformation recovery.

[0045] In one embodiment, the drive assembly 20 includes a first drive structure 21, a second drive structure 22, a third drive structure 23, and a workbench 24, wherein the second drive structure 22 is connected to the first drive structure 21, the third drive structure 23 is connected to the second drive structure 22, the workbench 24 is connected to the third drive structure 23, and the limiting assembly 30 and the detection assembly 40 are respectively connected to the workbench 24; wherein the first drive structure 21 is used to drive the second drive structure 22 to move in a first direction, the second drive structure 22 is used to drive the third drive structure 23 to move in a second direction, and the third drive structure 23 is used to drive the workbench 24 to move in a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The workbench 24 can move freely in three-dimensional space with the cooperation of the first drive structure 21, the second drive structure 22, and the third drive structure 23, so as to drive the limiting assembly 30 and the detection assembly 40 to the bus 111 during welding, and to drive the limiting assembly 30 and the detection assembly 40 to the next welding position after the welding is completed.

[0046] The first drive structure 21 can achieve transmission by means of a servo motor and a lead screw, or by means of a cylinder drive; the second drive structure 22 can achieve transmission by means of a servo motor and a lead screw, or by means of a cylinder drive; the third drive structure 23 can achieve transmission by means of a servo motor and a lead screw, or by means of a cylinder drive.

[0047] Furthermore, the work seat 24 is provided with a limiting cavity 241, and the work seat 24 is used to limit the single cell 000 when moving along the first direction. The limiting cavity 241 can be formed by two plates extending downward from the work seat 24, or it can be a groove-shaped structure dug on the work seat 24. The first direction is the arrangement direction of multiple single cells 000. Multiple single cells 000 form a battery pack, and the limiting cavity 241 can limit the width direction of the battery pack. When the placement position of a single cell 000 is offset, the work seat 24 can correct the single cell 000 through the limiting cavity 241 to ensure that multiple single cells 000 can be placed in a straight line along the first direction, thereby ensuring the accuracy of the welding between the busbar 111 and the pole.

[0048] See also Figure 5 and Figure 6 As shown, Figure 5 is a cross-sectional schematic diagram of a welding tool provided by an embodiment of the present invention, Figure 6 The embodiment of the present invention provides Figure 5 A partial enlarged schematic diagram of area B in the middle.

[0049] The limiting assembly 30 includes a pressing sleeve 31, an elastic member 32 and a fastener 33. The elastic member 32 is arranged between the pressing sleeve 31 and the working seat 24. The elastic member 32 is in a normal deformation state. When subjected to external force, the elastic member 32 will deform. After the external force disappears, the elastic member 32 will restore its deformation. The elastic member 32 can be a spring or a shrapnel. The fastener 33 passes through the working seat 24 and the elastic member 32 in sequence and is connected to the pressing sleeve 31. The pressing sleeve 31 is slidably connected to the working seat 24 through the fastener 33. The fastener 33 can be a screw, or a rivet, pin, etc. The elastic member 32 is distributed along the circumference of the fastener 33. The fastener 33 has a shaping effect on the elastic member 32, preventing the elastic member 32 from deforming along the circumference of the fastener 33, so as to ensure the stable elasticity of the elastic member 32. The pressing sleeve 31 is used to elastically support the bus 111. The pressing sleeve 31 is provided with a through welding bead, and the welder welds the bus 111 and the pole through the welding bead.

[0050] In this embodiment, the elastic member 32 is arranged between the pressing sleeve 31 and the working seat 24. When the pressing sleeve 31 presses against the bus 111, it will gradually approach the working seat 24, thereby synchronously compressing the elastic member 32. The elastic member 32 will simultaneously apply pressure to the pressing sleeve 31 to continuously press against the bus 111, thereby achieving an elastic pressing effect to prevent the pressing sleeve 31 from hard crushing of the bus 111 and the battery.

[0051] Furthermore, the working seat 24 defines a working hole 242, and a portion of the compression sleeve 31 is confined within the working hole 242. The compression sleeve 31 moves along the axis of the working hole 242 when moving toward and away from the working seat 24, thereby ensuring that the compression sleeve 31 can move in a fixed direction to accurately press the busbar 111 against the terminal of the single battery 000.

[0052] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0053] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A welding tool, characterized in that: include: A base for placing multiple single batteries to be welded; A driving assembly is provided on the base; a limiting assembly connected to the driving assembly, the limiting assembly being used to press the busbar onto the single battery and provide welding for the welder; as well as A detection component connected to the driving component, the detection component is used to detect the welding between the busbar and the single battery; The distance between the contact point between the limiting component and the busbar and the contact point between the detecting component and the busbar is a clearance distance L, and the clearance distance L is N times the spacing between adjacent single battery poles, where N is a positive integer.

2. The welding tool according to claim 1, characterized in that: The detection component includes an air pipe and a suction cup. The air pipe is connected to the suction cup. The air pipe is used to be connected to the air pump, and the suction cup is used to cover the welding position.

3. The welding tool according to claim 2, characterized in that: The detection component also includes a switch and a detector. The switch is connected to the trachea and is used to control the conduction of the trachea. The detector is connected to the trachea and is used to detect the air pressure in the trachea.

4. The welding tool according to claim 2, characterized in that: The air pipe includes a main line and at least two auxiliary lines, the at least two auxiliary lines are respectively connected to the main line, the main line is used to communicate with the air pump, the number of the suction cups is at least two, at least two of the suction cups are respectively connected to the at least two auxiliary lines, and the at least two suction cups are used to respectively cover the welding points of the positive electrode and the negative electrode of the single battery.

5. The welding tool according to claim 2, characterized in that: The suction cup includes a transition end and a buffer portion connected to each other, the transition portion is connected to the air pipe, the transition portion is provided with a channel connected to the air pipe, the buffer portion is provided with a working chamber connected to the channel, the buffer portion is used to cover the welding position, and the buffer portion is folded.

6. The welding tool according to any one of claims 1 to 5, characterized in that: The driving assembly includes a first driving structure, a second driving structure, a third driving structure and a working seat, the second driving structure is connected to the first driving structure, the third driving structure is connected to the second driving structure, the working seat is connected to the third driving structure, the limiting assembly and the detection assembly are respectively connected to the working seat; wherein, the first driving structure is used to drive the second driving structure to move along the first direction, the second driving structure is used to drive the third driving structure to move along the second direction, and the third driving structure is used to drive the working seat to move along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The welding tool according to claim 6, characterized in that: The working seat is provided with a limiting cavity, and the working seat is used to limit the single battery when moving along the first direction.

8. The welding tool according to claim 6, characterized in that: The limiting component includes a pressing sleeve, an elastic member and a fastener. The elastic member is arranged between the pressing sleeve and the working seat. The fastener passes through the working seat and the elastic member in sequence and is connected to the pressing sleeve. The pressing sleeve is used to elastically support the busbar, and the pressing sleeve is provided with a through welding bead.

9. The welding tool according to claim 8, characterized in that: The working seat is provided with a working hole, and part of the pressing sleeve is located in the working hole.

10. A welding device, characterized in that: The welding device comprises: a welder and the welding tool according to any one of claims 1 to 9, wherein the welder is used to weld the busbar and the single battery together through the welding tool.

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