Laser welding equipment for square case battery and auxiliary clamp thereof

Abstract

The present application relates to square shell battery laser welding technical field, disclose a kind of square shell battery laser welding equipment and its auxiliary fixture, the auxiliary fixture includes fixture seat, the inside of the fixture seat is provided with cavity;Two groups of pressure head components, symmetrically set on the fixture seat.The present application by two groups of pressure head components are placed in the top of two battery connecting tabs of each group of square shell battery respectively, air component is circulated into protective gas into the inside of cavity, two groups of communication components protective gas is introduced into the inside of pressure head component to protect the laser welding of battery connecting tab and cover plate, finally laser welding device is realized by cooperating with pressure head component to the laser welding of battery connecting tab and cover plate.Laser welding quality is improved by two groups of communication components and air component cooperation to send protective gas directly to the welding surface of battery connecting tab and cover plate smoothly, can effectively prevent the situation of splashing explosion point appears.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of square shell battery cell laser welding, in particular to a square shell battery cell laser welding device and an auxiliary clamp thereof. BACKGROUND

[0002] In recent years, laser technology has developed rapidly. As a new type of welding technology, laser welding technology has been more and more skillfully applied in various occasions. With the increasingly wide application of laser technology in power battery assembly, the advantages of laser welding are very prominent. However, as the workpiece processed by laser welding becomes smaller and smaller, the requirements for the clamp of laser welding become higher and higher.

[0003] In the production process of the existing square shell battery cell, the A battery cell and the B battery cell are generally connected by two groups of connecting sheets and adhesive tapes, and the connecting sheet and the cover plate are welded by a laser welding device and a welding clamp. The existing welding clamp has poor ventilation protection for the welding surface, which is easy to cause damage to the surface of the connecting sheet, thereby causing welding quality problems of the connecting sheet and the cover plate. SUMMARY

[0004] The purpose of the present application is to overcome the problem of poor ventilation protection in the prior art, which leads to unqualified welding quality. The present application provides a square shell battery cell laser welding device and an auxiliary clamp thereof, which has the effect of good ventilation protection.

[0005] In order to achieve the above purpose, the present application provides an auxiliary clamp of a square shell battery cell laser welding device, which comprises:

[0006] A clamp seat, an internal cavity is formed in the clamp seat;

[0007] Two groups of pressure head assemblies are symmetrically arranged on the clamp seat, and the two groups of pressure head assemblies are movably penetrated into the clamp seat, which are used to cooperate with a laser welding device to weld the battery connecting sheet and the cover plate connecting two square shell battery cells;

[0008] Two groups of communication assemblies are arranged on the outer sides of the two groups of pressure head assemblies and located in the internal cavity, which are used to communicate the internal cavity and the internal cavity of the pressure head assembly;

[0009] A ventilation assembly is arranged on the side wall of the clamp seat, which is used to cooperate with the two groups of communication assemblies to circulate the protective gas into the welding surface of the battery connecting sheet and the cover plate during laser welding of the battery connecting sheet and the cover plate.

[0010] Optionally, the pressure head assembly comprises:

[0011] a hollow cylinder arranged inside the cavity, a bottom end of the hollow cylinder penetrating through the clamp seat and extending below the clamp seat;

[0012] a top plate arranged above the hollow cylinder, a top end of the top plate penetrating through the clamp seat and extending above the clamp seat, and a laser inlet being formed in the top plate and matched with a top opening of the hollow cylinder.

[0013] Optionally, the pressure head assembly further comprises a spring arranged between the hollow cylinder and the top plate, and two ends of the spring are connected with the top of the hollow cylinder and the bottom of the top plate respectively.

[0014] Optionally, the communication assembly comprises:

[0015] two groups of communication seats symmetrically arranged on the side wall of the hollow cylinder and another group of the hollow cylinder, a communication groove being formed in the communication seat, one end of the communication groove being communicated with the cavity, and the other end of the communication groove being communicated with the inside of the hollow cylinder;

[0016] two groups of communication pipelines respectively arranged inside the two groups of communication grooves, one end of the communication pipeline being communicated with the corresponding communication groove, the other end of the communication pipeline being communicated with the inside of the hollow cylinder, and the communication pipeline being inclined downward.

[0017] Optionally, the shape of the other end of the communication pipeline comprises an oval shape.

[0018] Optionally, the ventilation assembly comprises:

[0019] two groups of first ventilation holes respectively arranged at two opposite ends of the clamp seat, the two groups of first ventilation holes being located on the same line with the two groups of pressure head assemblies, and the two groups of first ventilation holes being used for being connected with the gas injection device or the gas suction device;

[0020] a second ventilation hole formed in the top of the clamp seat and used for being connected with the gas suction device or the gas injection device.

[0021] Optionally, the auxiliary clamp further comprises two groups of positioning pins symmetrically arranged on the top of the clamp seat and used for being matched and connected with the positioning holes on the laser welding device.

[0022] Optionally, the side wall of the clamp seat is provided with a taking and placing hole, and the taking and placing hole is used for being matched with the mechanical hand to take and place the clamp seat.

[0023] Optionally, the inner wall of the hollow cylinder is provided with a tapered surface.

[0024] In another aspect, the application further provides a square shell battery cell laser welding device, comprising:

[0025] laser welding device;

[0026] The auxiliary fixture as claimed in any one of the above;

[0027] The gas injection device is connected with one end of the ventilation assembly of the auxiliary fixture;

[0028] The gas suction device is connected with the other end of the ventilation assembly.

[0029] Through the above technical solution, the square cell laser welding equipment and the auxiliary fixture thereof provided by the present application can place two groups of pressing head assemblies on the top of two battery connecting pieces of each group of square cell, circulate the protective gas into the cavity through the ventilation assembly, guide the protective gas into the interior of the pressing head assembly through the two groups of communication assemblies to protect the laser welding of the battery connecting piece and the cover plate, and finally realize the laser welding of the battery connecting piece and the cover plate through the cooperation of the laser welding device and the pressing head assembly. The two groups of communication assemblies and the ventilation assembly are used to cooperate to stably and directly deliver the protective gas to the welding surface of the battery connecting piece and the cover plate, which can effectively prevent the splashing explosion point from occurring and improve the quality of the laser welding. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of the auxiliary fixture of the square cell laser welding equipment according to an embodiment of the present application;

[0031] Figure 2 is a top view of the auxiliary fixture of the square cell laser welding equipment according to an embodiment of the present application;

[0032] Figure 3 is a sectional view according to A-A in Figure 2

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, fixture seat 2, top plate

[0035] 3, laser inlet 4, hollow cylinder

[0036] 5, second ventilation hole 6, positioning pin

[0037] 7, first ventilation hole 8, taking and placing hole

[0038] 9, communication pipeline 10, cavity

[0039] 11, communication groove 12, communication seat DETAILED DESCRIPTION

[0040] ​The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0041] Figure 1 is a structure diagram of an auxiliary fixture of a square cell laser welding device according to an embodiment of the present application, Figure 2 is a top view of an auxiliary fixture of a square cell laser welding device according to an embodiment of the present application; Figure 3 is a sectional view of A-A in Figure 2 . In Figure 1 , Figure 2 and Figure 3 , the auxiliary fixture can include a fixture base 1, two sets of pressure head assemblies, two sets of communication assemblies, and a ventilation assembly. Specifically, the fixture base 1 can include a cavity 10.

[0042] The cavity 10 is opened in the inside of the fixture base 1, and the two sets of pressure head assemblies are symmetrically arranged on the fixture base 1 and movably penetrate the fixture base 1, for cooperating with the laser welding device to weld the battery connecting tabs and the cover plates of two square cells. The two sets of communication assemblies are respectively arranged on the outside of the two sets of pressure head assemblies and located in the inside of the cavity 10, for communicating the cavity 10 and the inside of the pressure head assemblies. The ventilation assembly is arranged on the side wall of the fixture base 1, for cooperating with the two sets of communication assemblies to circulate the protective gas to the welding surfaces of the battery connecting tabs and the cover plates when laser welding the battery connecting tabs and the cover plates.

[0043] When laser welding is needed for the two sets of battery connecting tabs and the cover plates between the A cell and the B cell on a single set of square cells, the fixture base 1 needs to be installed on the laser welding device, and the fixture base 1 is moved to the top of the two sets of battery connecting tabs by the laser welding device, while the two sets of battery connecting tabs are pressed to ensure the relative fixation of the fixture base 1 and the two sets of battery connecting tabs. Then the protective gas is circulated into the inside of the cavity 10 of the fixture base 1 through the ventilation assembly, and the protective gas enters the inside of the two sets of pressure head assemblies along the two sets of communication assemblies and contacts the two sets of battery connecting tabs and the cover plates. Finally, the laser welding device is driven to start and the two sets of laser beams enter the inside of the two sets of pressure head assemblies to contact the corresponding battery connecting tabs, so as to realize the laser welding of the battery connecting tabs and the cover plates.

[0044] In the laser welding process of the traditional battery connecting sheet and cover plate, the connecting sheet and the cover plate are generally welded through the cooperation of the laser welding equipment and the welding clamp. However, the existing welding clamp has poor ventilation protection for the welding surface of the battery connecting sheet, which is easy to cause damage to the surface of the connecting sheet, thereby causing quality problems of the welding of the battery connecting sheet and the cover plate, and increasing the production cost. In the embodiment of the present application, the two groups of communication assemblies are used to communicate the cavities and the interiors of the pressure head assemblies, which can realize that the protective gas can flow through the welding surface of the battery connecting sheet and the cover plate in a circulating manner. On the one hand, it can prevent the battery connecting sheet from oxidizing, and on the other hand, it can improve the stability and reliability of the battery connecting sheet in the laser welding process, effectively avoiding the occurrence of splashing explosion points and the like, and improving the safety and quality of the laser welding. In addition, the two groups of pressure head assemblies are located at the top of the two groups of battery connecting sheets, i.e. corresponding to a group of square shell cells, and the distance between the two groups of pressure head assemblies is the distance of the two welding points on the two groups of battery connecting sheets, thereby realizing the synchronous laser welding of the two groups of battery connecting sheets of each group of square shell cells, and improving the efficiency and precision in the laser welding process.

[0045] In the embodiment of the present application, as shown in Figure 1 and Figure 3 , the pressure head assembly can include a hollow cylinder 4 and a top plate 2.

[0046] The hollow cylinder 4 is arranged inside the cavity 10, and the bottom end of the hollow cylinder 4 penetrates through the clamp seat 1 and extends below the clamp seat 1. The top plate 2 is arranged above the hollow cylinder 4, the top end of the top plate 2 penetrates through the clamp seat 1 and extends above the clamp seat 1, and the top plate 2 is provided with a laser inlet 3 matched with the top opening of the hollow cylinder 4.

[0047] When the clamp seat is placed on the top of the two groups of battery connecting sheets, the driving laser device is started and emits laser, the laser enters along the laser inlet 3, and reaches the top of the battery connecting sheet along the interior of the hollow cylinder 4, thereby achieving the purpose of laser welding of the battery connecting sheet. The structure on the one hand facilitates the entry and work of the laser, and on the other hand can protect the battery connecting sheet outside the welding area, avoiding the deviation of the laser device to produce defective products. In addition, the laser inlet 3 can also be used as a dust suction channel to cooperate with the related dust suction equipment for dust suction, reducing the influence of dust on the laser welding, and ensuring the safety and reliability in the laser welding process.

[0048] In the embodiment of the present application, the pressure head assembly can further include a spring.

[0049] The spring is arranged between the hollow cylinder 4 and the top plate 2, and the two ends of the spring are respectively connected with the top of the hollow cylinder 4 and the bottom of the top plate 2.

[0050] When the clamp seat 1 is respectively placed on the top of the two groups of battery connecting pieces, if the heights of the two groups of battery connecting pieces are inconsistent, the spring is compressed and deformed correspondingly, so that the relative levelness of the upper surface of the clamp seat 1 is guaranteed, and the precision of laser welding is further improved. In addition, the clamp seat 1 can meet the auxiliary welding of battery connecting pieces of various sizes and types, and has wider applicability. Meanwhile, the spring is an elastic component, can also buffer external force, and thus can avoid that the clamp seat 1 damages the surface of the battery connecting piece due to excessive external pressure.

[0051] In this embodiment of the present application, as shown in Figure 1 、 Figure 2 and Figure 3 , the communication assembly can include two groups of communication seats 12 and two groups of communication pipelines 9. Specifically, the communication seat 12 can include a communication groove 11.

[0052] The two groups of communication seats 12 are symmetrically arranged on the side wall in the direction connecting the hollow cylinder 4 and another hollow cylinder 4, and the communication groove 11 is arranged on the communication seat 12. One end of the communication groove 11 is in communication with the cavity 10, and the other end of the communication groove 11 is in communication with the inside of the hollow cylinder 4. The two groups of communication pipelines 9 are respectively arranged in the two groups of communication grooves 11. One end of the communication pipeline 9 is in communication with the communication groove 11, and the other end of the communication pipeline 9 is in communication with the inside of the hollow cylinder 4.

[0053] When the ventilation assembly is started and the circulating protective gas is introduced into the inside of the cavity 10, the circulating gas enters the inside of the hollow cylinder 4 through the communication groove 11 of one of the two groups of communication seats 12, and then the protective gas in the inside of the hollow cylinder 4 flows out through the communication groove 11 of the other group of communication seats 12, so as to realize the circulation of the protective gas in the inside of the hollow cylinder 4. In addition, the protective gas in the inside of one of the two groups of communication grooves 11 enters the inside of the hollow cylinder along one end of the corresponding communication pipeline 9, and realizes circulation along the corresponding communication pipeline 9 of the other group of communication grooves 11, so as to expand the flow range and flow amount of the protective gas in the inside of the hollow cylinder 4, and further improve the protection effect on the battery connecting piece during the welding process.

[0054] In this embodiment of the present application, the shape of the other end of the communication pipeline 9 can be various forms known by those skilled in the art, such as a circular shape, a square shape, etc. However, in a preferred example of the present application, considering the finiteness of the welding surface protection range of the battery connecting piece and the protection effect, the shape of the other end of the communication pipeline 9 includes an elliptical shape. The elliptical shape of the air outlet is more conducive to the gathering and flowing of the protective gas, and thus improves the protection effect of the protective gas on the battery connecting piece during the laser welding process.

[0055] In this embodiment of the present application, the vertical height of one end of the communication pipe 9 compared with the other end of the communication pipe 9 can be that the one end of the communication pipe 9 is higher than the other end of the communication pipe 9, the one end of the communication pipe 9 is lower than the other end of the communication pipe 9, and the height of the one end of the communication pipe 9 is consistent with the other end of the communication pipe 9. However, in a preferred mode of the present application, in view of the convenience and reliability of the protective gas flowing to the surface of the battery tab, the one end of the communication pipe 9 is higher than the other end of the communication pipe 9, that is, the other end of the communication pipe 9 is inclined downward, the protective gas flows directly along the communication pipe 9 to the surface of the battery tab, and the effect of the protective gas on the protection of the battery tab is further improved.

[0056] In this embodiment of the present application, as shown in Figure 1 and Figure 2 , the vent assembly can include two groups of first vent holes 7 and second vent holes 5.

[0057] The two groups of first vent holes 7 are respectively arranged at opposite ends of the clamp seat 1, and the two groups of first vent holes 7 are located on the same line with the two groups of pressure head assemblies. The two groups of first vent holes 7 are used to be connected with the gas injection device or the gas suction device. The second vent hole 5 is arranged at the top of the clamp seat 1 and is used to be connected with the gas suction device or the gas injection device.

[0058] When it is needed to introduce the circulating protective gas into the interior of the cavity 10, the two groups of first vent holes 7 are connected with the gas injection device, and the second vent hole 5 is connected with the gas suction device, so that the protective gas can flow from the two groups of first vent holes 7 to the middle of the cavity 10. In addition, the two groups of first vent holes 7 can also be connected with the gas suction device, and the second vent hole 7 is connected with the gas injection device, so that the protective gas can flow from the middle of the cavity 10 to the two ends of the cavity. The two modes can be selected according to the actual situation, which is more convenient and fast.

[0059] In this embodiment of the present application, as shown in Figure 1 and Figure 2 , the auxiliary clamp can also include two groups of positioning pins 6.

[0060] The two groups of positioning pins 6 are symmetrically arranged at the top of the clamp seat 1 and are used to be connected with the positioning holes on the laser welding device.

[0061] When the auxiliary clamp is needed to be used, the laser welding device needs to be fixedly connected with the auxiliary clamp, that is, the positioning hole of the laser welding device is moved to the upper side of the corresponding positioning pin 6 and the positioning pin 6 and the positioning hole are connected, so that the reliable connection between the auxiliary clamp and the laser welding device can be realized, which is more convenient and fast.

[0062] In this embodiment of the present application, as shown in Figure 1As shown, the side wall of the clamp seat 1 is provided with a taking and placing hole 8 for cooperating with the mechanical hand to take and place the clamp seat 1.

[0063] When the clamp seat 1 needs to be replaced, the mechanical hand clamps and fixes the clamp seat 1 through the taking and placing hole 8, and the clamp seat 1 can be installed on the laser welding device from bottom to top or taken off from the laser welding device, which is safer.

[0064] In the embodiment of the present application, as shown, Figure 3 The inside of the hollow cylinder 4 is provided with a tapered surface. Laser welding has a certain inclination angle, and the tapered surface is used to cooperate with laser welding and improve the effect of laser welding.

[0065] On the other hand, the present application also provides a square shell battery laser welding device. Specifically, the square shell battery laser welding device can include a laser welding device, an auxiliary clamp, a gas injection device, and a gas suction device. Specifically, the auxiliary clamp can include a clamp seat 1, two sets of pressure head assemblies, two sets of communication assemblies, and a ventilation assembly. Specifically, the clamp seat 1 can include a cavity 10.

[0066] The inside of the clamp seat 1 is provided with a cavity 10, and two sets of pressure head assemblies are symmetrically arranged on the clamp seat 1 and movably penetrate the clamp seat 1, which are used to cooperate with the laser welding device to weld and connect the battery connecting tabs and the cover plates of two square shell batteries. Two sets of communication assemblies are respectively arranged on the outside of the two sets of pressure head assemblies and located inside the cavity 10, which are used to communicate the inside of the cavity 10 and the pressure head assemblies. The ventilation assembly is arranged on the side wall of the clamp seat 1 and used to cooperate with the two sets of communication assemblies to circulate the protective gas to the welding surface of the battery connecting tabs and the cover plates during laser welding. The gas injection device is connected to one end of the ventilation assembly of the auxiliary clamp, and the gas suction device is connected to the other end of the ventilation assembly.

[0067] When laser welding is needed for the two sets of battery connecting tabs and cover plates between the A battery and the B battery on a single set of square shell batteries, the clamp seat 1 needs to be installed on the laser welding device, and the clamp seat 1 is moved to the top of the two sets of battery connecting tabs by the laser welding device, while pressing the two sets of battery connecting tabs to ensure the relative fixation of the clamp seat 1 and the two sets of battery connecting tabs. Then the gas injection device and the gas suction device circulate the protective gas into the inside of the cavity 10 of the clamp seat 1 along the ventilation assembly, and the protective gas enters the inside of the two sets of pressure head assemblies along the two sets of communication assemblies and contacts the two sets of battery connecting tabs and the cover plates in a circulating flow state. Finally, the laser welding device is driven to start and make the two sets of laser respectively enter into contact with the corresponding battery connecting tabs along the inside of the two sets of pressure head assemblies, so as to realize the laser welding of the battery connecting tabs and the cover plates.

[0068] Through the technical scheme, the square shell battery cell laser welding equipment and the auxiliary clamp provided by the application place two groups of pressing head assemblies on the top of two battery connecting plates of each group of square shell battery cells respectively, the air circulation assembly circulates and introduces the protective gas into the cavity 10, the two groups of communication assemblies introduce the protective gas into the interior of the pressing head assemblies to protect the laser welding of the battery connecting plates and the cover plates, and finally the laser welding device realizes the laser welding of the battery connecting plates and the cover plates by cooperating with the pressing head assemblies. The two groups of communication assemblies and the air circulation assembly cooperate to stably and directly deliver the protective gas to the welding surface of the battery connecting plates and the cover plates, which can effectively prevent the splashing explosion point from occurring and improve the quality of the laser welding.

[0069] The preferred embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the application within the technical concept of the application, and these simple modifications all belong to the protection scope of the application. In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the application will not further describe various possible combination manners.

[0070] In addition, various different embodiments of the application can also be combined in any manner, as long as they do not deviate from the idea of the application, and they should also be considered as disclosed by the application.

Claims

1. An auxiliary jig of a square case battery cell laser welding apparatus, characterized by, The utility model relates to a kind of auxiliary fixture for laser welding battery tab and cover plate, including: Clamp seat (1), the inside of the clamp seat (1) is hollowed out cavity (10); Two groups of pressure head components, symmetrically arranged on the clamp seat (1), two groups of the pressure head components are movably penetrated in the clamp seat (1), for cooperating with laser welding device to weld the battery tab and the cover plate of two square shell electric core; Two groups of communication components are respectively arranged on the outside of two groups of the pressure head components, and located in the inside of the cavity (10), for communicating the inside of the cavity (10) and the pressure head component; Ventilation component, arranged in the side wall of the clamp seat (1), for cooperating with two groups of communication components to circulate into protective gas on the welding surface of the battery tab and the cover plate when laser welding is carried out on the battery tab and the cover plate; The pressure head component includes: Hollow cylinder (4), arranged in the inside of the cavity (10), the bottom end of the hollow cylinder (4) passes through the clamp seat (1) and extends to below the clamp seat (1); Top plate (2), arranged above the hollow cylinder (4), the top end of the top plate (2) passes through the clamp seat (1) and extends to above the clamp seat (1), and the top plate (2) is provided with laser inlet (3) matched with the top opening of the hollow cylinder (4); The communication component includes: Two groups of communication seats (12), symmetrically arranged on the side wall of the hollow cylinder (4) and another group of the hollow cylinder (4) connecting line direction, the communication seat (12) is provided with communication groove (11), one end of the communication groove (11) is communicated with the cavity (10), and the other end of the communication groove (11) is communicated with the inside of the hollow cylinder (4); Two groups of communication pipelines (9) are respectively arranged in the inside of two groups of the communication groove (11), one end of the communication pipeline (9) is communicated with the corresponding communication groove (11), the other end of the communication pipeline (9) is communicated with the inside of the hollow cylinder (4), and the communication pipeline (9) is inclined downward; The shape of the other end of the communication pipeline (9) includes oval shape; The ventilation component includes: Two groups of first air holes (7) are respectively arranged in the opposite ends of the clamp seat (1), two groups of the first air holes (7) are located on the same connecting line with two groups of the pressure head component, and two groups of the first air holes (7) are used to be connected with gas injection device; Second air hole (5), arranged in the top of the clamp seat (1), is used to be connected with suction device.

2. The auxiliary jig according to claim 1, characterized by The pressure head component further includes spring, the spring is arranged between the hollow cylinder (4) and the top plate (2), and the two ends of the spring are respectively connected with the top of the hollow cylinder (4) and the bottom of the top plate (2).

3. The auxiliary fixture of claim 1, wherein The auxiliary fixture further includes two groups of positioning pins (6), two groups of the positioning pins (6) are symmetrically arranged on the top of the clamp seat (1), for cooperating with the positioning hole on the laser welding device to be connected.

4. The auxiliary fixture of claim 1, wherein The side wall of the clamp seat (1) is provided with taking and placing hole (8), and the taking and placing hole (8) is used to cooperate with manipulator to take and place the clamp seat (1).

5. The auxiliary fixture of claim 1, wherein The inner wall of the hollow cylinder (4) is provided with taper surface.

6. A square can laser welding apparatus characterized by comprising: Comprising: a laser welding device; an auxiliary jig as claimed in any one of claims 1 to 5; an air injection device connected to one end of a vent assembly of the auxiliary jig; an air suction device connected to the other end of the vent assembly.

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