Welding pressure head

Abstract

The utility model discloses a welding pressure head which comprises a main body part, a plurality of through grooves and a plurality of gas transmission structures are arranged on the main body part, the through grooves comprise a plurality of welding through grooves, the welding through grooves and the gas transmission structures are communicated in a one-to-one correspondence mode, and the gas transmission structures are mutually independent and used for inputting shielding gas into the corresponding welding through grooves. The problems that a plurality of welding through grooves share one gas transmission structure, gas transmission channels of part of the welding through grooves are lengthy, and the gas transmission effect is common are solved, the gas transmission channels are shorter, gas transmission is smoother, and the welding effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a welding head. Background Art

[0002] At present, in a battery module, cells are mostly connected through busbars, and the busbars and the pole columns of the cells are fixed by being pressed and welded by a head.

[0003] However, multiple welding interfaces on the head for welding the busbars share a protective gas input structure at present, resulting in a long gas transmission channel for some welding interfaces and general gas transmission effect; and when one welding interface is in use, protective gas is input to other welding interfaces, causing serious waste. Summary of the Utility Model

[0004] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the utility model is to provide a welding head, which solves the problems that multiple welding grooves share one gas transmission structure, the gas transmission channels of some welding grooves are long, the gas transmission effect is general, and there is waste of protective gas, realizes shorter gas transmission channels, smoother gas transmission, good welding effect, and saves the use of protective gas.

[0005] The purpose of the utility model is realized by the following technical solutions:

[0006] A welding head includes a main body part, on which a plurality of grooves and a plurality of gas transmission structures are provided. The grooves include a plurality of welding grooves, and the welding grooves and the gas transmission structures are arranged in one-to-one correspondence and communicated. Each of the gas transmission structures is independent and used to input protective gas into the corresponding welding groove.

[0007] In one embodiment, the grooves further include positioning grooves for positioning the parts to be welded, and a plurality of the welding grooves are arranged along the outer periphery of the positioning grooves.

[0008] In one embodiment, the main body part includes a first end face and a second end face which are oppositely arranged. The first end face is used to press the parts to be welded, and the second end face is used to connect welding equipment; the main body part has a thickness direction, the first end face and the second end face are respectively located on both sides of the main body part along the thickness direction, and each of the grooves penetrates through in the thickness direction.

[0009] In one embodiment, a plurality of fixing holes are provided on the second end face for connection and pairing with the welding equipment.

[0010] In one embodiment, a plurality of cut corners are provided on the second end face, each cut corner is communicated with the corresponding welding groove, and the depth of the cut corner is less than the depth of the welding groove.

[0011] In one embodiment, each of the gas transmission structures includes an air inlet and an exhaust passage, and both the air inlet and the exhaust passage communicate with the corresponding welding through groove.

[0012] In one embodiment, the cross-sectional area of the exhaust passage is smaller than that of the air inlet.

[0013] In one embodiment, the air inlet includes an inlet end and an outlet end. The inlet end is used to connect to an external gas source, the outlet end communicates with the welding through groove, the main body portion includes a first end face and a second end face, and along the thickness direction of the main body portion, the inlet end is disposed close to the second end face, and the outlet end is disposed close to the first end face.

[0014] The beneficial effects of the present utility model are as follows: Each welding through groove on the welding head has an independent gas transmission structure. When using a certain welding through groove for welding, protective gas is input into the welding through groove through the corresponding gas transmission structure, improving the gas transmission effect; when a welding through groove is in use, only the corresponding welding through groove has protective gas input, saving the use of protective gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a front structural schematic diagram of a welding head according to an embodiment of the present utility model;

[0017] Figure 2 is Figure 1 a rear structural schematic diagram;

[0018] Figure 3 is Figure 1 a structural schematic diagram of pressing the bus bar onto the battery cell.

[0019] In the figure: 100, welding head; 1, main body portion; 11, first end face; 12, second end face; 2, through groove; 21, welding through groove; 22, positioning through groove; 3, gas transmission structure; 31, air inlet; 311, inlet end; 312, outlet end; 32, exhaust passage; 4, chamfer; 5, fixing hole; 6, bus bar; 7, battery cell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will describe in detail specific embodiments of the present utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the description of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0021] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "arranged", "installed", "connected", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0022] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0023] Terms such as "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0024] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to including the listed elements, it may also include other elements not specifically listed.

[0025] The present utility model provides a welding head 100, as Figures 1 to 3 shown, including a main body portion 1 for pressing the workpiece to be welded, such as a bus bar 6 and an electric core 7; a plurality of through grooves 2 and a plurality of gas supply structures 3 are provided on the main body portion 1. The through grooves 2 include a plurality of welding through grooves 21 for aligning welding points, such as the welding points of the tabs of the bus bar 6 and the electric core 7, and the welding process is completed in the welding through grooves 21; the welding through grooves 21 and the gas supply structures 3 are arranged in one-to-one correspondence and communicated. Each gas supply structure 3 is independent and is used to input protective gas into the corresponding welding through groove 21. In this embodiment, each welding through groove 21 on the welding head 100 has an independent gas supply structure 3. When using a certain welding through groove 21 for welding, the protective gas is input into the corresponding welding through groove 21 through the corresponding gas supply structure 3, improving the gas supply effect; only the corresponding welding through groove 21 has protective gas input when a welding through groove 21 is in use, saving the use of protective gas.

[0026] Specifically, the welding through slots 21 correspond to the welding point positions, and each welding through slot 21 has an independent gas transmission structure 3. When using a particular welding through slot 21 for welding, protective gas is input into the corresponding welding through slot 21 through the gas transmission structure 3, forming a protective covering layer around the welding point to protect the welding area from the interference of oxygen and other contaminants, thereby improving the welding quality. When protective gas is introduced into the welding through slot 21, since each gas transmission structure 3 is relatively independent and no gas is introduced into other gas transmission structures 3, it solves the problems of the original multiple welding through slots 21 sharing one gas transmission structure 3, where the gas transmission channels of some welding through slots 21 are long, the gas transmission effect is poor, and when one welding through slot 21 is in use, protective gas is input into all other welding through slots 21, resulting in serious waste. It realizes shorter gas transmission channels, smoother gas transmission, better gas transmission effect, improves the welding quality, and reduces welding defective products.

[0027] Among them, the parts to be welded are the bus bar 6 and the battery cell 7. The pole connection part of the bus bar 6 and the battery cell 7 is pressed tightly by the welding head 100, and then welding fixation is carried out. Specifically, the bus bar 6 is placed on the battery cell 7 and connected to the pole of the battery cell 7. The bus bar 6 is pressed tightly on the battery cell 7 by the welding head 100, and one of the welding through slots 21 is aligned with the welding point of the bus bar 6 and the pole. During welding, first, the external gas source connected to the corresponding gas transmission structure 3 is opened, and the protective gas is input into the welding through slot 21 to be welded, and then welding is carried out.

[0028] As an implementation manner, as Figure 1 and Figure 2 shown, the through slot 2 further includes a positioning through slot 22, and the positioning through slot 22 is used to position the parts to be welded. A plurality of welding through slots 21 are arranged along the outer periphery of the positioning through slot 22. Specifically, the positioning through slot 22 is a circular slot, and a plurality of welding through slots 21 are fan-shaped slots, surrounding the outer periphery of the positioning through slot 22, and the connection trajectory of the plurality of welding through slots 21 and the positioning through slot 22 is a concentric circle.

[0029] Among them, the positioning through slot 22 is used to facilitate positioning with the parts to be welded during welding, identify the welding marking points, and can avoid the position of the explosion-proof valve (not shown) of the battery cell 7; the battery cell 7 and the bus bar 6 are pressed tightly by the main body part 1 (as Figure 3 shown), at this time, the positioning through slot 22 of the main body part 1 corresponds to the position of the explosion-proof valve of the battery cell 7, playing a role of avoidance while positioning, and avoiding damage to the explosion-proof valve.

[0030] As an implementation manner, as Figures 1 to 3As shown, the main body 1 includes a first end face 11 and a second end face 12. The first end face 11 is used to press the workpiece to be welded, and the second end face 12 is used to connect to a welding device (not shown). The main body 1 has a thickness direction D. The first end face 11 and the second end face 12 are respectively located on both sides of the main body 1 along the thickness direction D, and each through groove 2 is provided through in the thickness direction D.

[0031] As an implementation manner, as Figure 1 shown, a plurality of fixing holes 5 are provided on the second end face 12 for connection and pairing with the welding device. The welding device and the welding head 100 can be connected by bolts cooperating with the fixing holes 5. Of course, the fixing holes 5 can also be through holes, penetrating the main body 1 in the thickness direction D.

[0032] As an implementation manner, as Figure 1 shown, chamfers 4 are provided on the second end face 12 corresponding to each welding through groove 21. The chamfers 4 communicate with the corresponding welding through grooves 21, and the depth of the chamfers 4 is less than the depth of the welding through grooves 21. In this embodiment, the setting of the chamfers 4 can increase the opening area of the welding through grooves 21 near the welding device end, thereby increasing the light transmittance and facilitating the observation of the welding condition of the welding points. And the chamfers 4 do not penetrate the main body 1, reducing the cutting difficulty, ensuring the structural strength of the main body 1, and also avoiding the chamfers 4 interfering with the setting of the gas transmission structure 3.

[0033] As an implementation manner, as Figure 1 and Figure 2 shown, each gas transmission structure 3 includes an air inlet 31 and an exhaust passage 32. The air inlets 31 are provided in one-to-one correspondence and communication with the welding through grooves 21, and the exhaust passages 32 are provided in one-to-one correspondence and communication with the welding through grooves 21. Among them, each gas transmission structure 3 includes an independently provided air inlet 31 and an exhaust passage 32, which is convenient for air intake and also facilitates the discharge of fume and welding slag. The air inlets 31 are arranged far from the first end face 11, that is, close to the second end face 12, and the exhaust passages 32 are arranged on the first end face 11, so that the shielding gas can enter the welding through grooves 21 through the air inlets 31 in sequence, and then flow through the welding through grooves 21 to the exhaust passages 32 on the first end face 11 for discharge. And the exhaust passages 32 are on the first end face 11, close to the welding points, which is convenient for the discharge of welding slag.

[0034] As an implementation manner, the cross-sectional area of the exhaust passage 32 is smaller than the cross-sectional area of the air inlet 31 to ensure that the welding through grooves 21 are filled with shielding gas. The shielding gas is an inert gas, such as argon, helium, etc.

[0035] As an implementation manner, as Figure 2As shown, the air inlet 31 includes an inlet end 311 and an outlet end 312. The inlet end 311 is used to connect to an external gas source, and the outlet end 312 communicates with the welding through groove 21. Along the thickness direction D of the main body portion 1, the inlet end 311 is located above the outlet end 312, that is, the air inlet 31 is inclined towards the first end face 11. During welding, the inlet end 311 is higher than the outlet end 312, which is convenient for the shielding gas to flow towards the position of the first end face 11 and quickly form a gas protection layer at the welding point.

[0036] As an implementation manner, the material of the main body portion 1 is Logao copper or red copper.

[0037] As an implementation manner, the indenter has a boat-shaped structure.

[0038] The beneficial effects of the present utility model:

[0039] Each welding through groove 21 on the welding indenter 100 has an independent gas transmission structure 3. When using a certain welding through groove 21 for welding, the shielding gas is input into the corresponding welding through groove 21 through the corresponding gas transmission structure 3, which improves the gas transmission effect and solves the problem that multiple original welding through grooves 21 share one gas transmission structure 3, resulting in long gas transmission channels and poor gas transmission effects for some welding through grooves 21. Moreover, when a welding through groove 21 is in use, only the corresponding welding through groove 21 has shielding gas input, which saves the use of shielding gas and avoids the serious waste problem that when one welding through groove 21 is in use, shielding gas is input into all other welding through grooves 21. It realizes shorter gas transmission channels, smoother gas transmission, better gas transmission effects, improves the welding quality, and reduces welding defective products.

[0040] The above is only a preferred embodiment of the present utility model and does not limit the present utility model in any form. Although the present utility model has been disclosed above with a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications using the above-disclosed technical content within the scope of the technical solution of the present utility model, which are equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change, and modification made to the above embodiment based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A welding pressure head, comprising a main body (1), characterized in that: The main body (1) is provided with a plurality of through grooves (2) and a plurality of gas delivery structures (3), the through grooves (2) comprising a plurality of welding through grooves (21), the welding through grooves (21) and the gas delivery structures (3) being arranged in a one-to-one correspondence and connected, and the gas delivery structures (3) are independent of each other and are used to input protective gas to the corresponding welding through grooves (21).

2. The welding pressure head according to claim 1, characterized in that: The through groove (2) further comprises a positioning through groove (22), wherein the positioning through groove (22) is used to position a workpiece to be welded, and a plurality of welding through grooves (21) are arranged along the outer periphery of the positioning through groove (22).

3. The welding pressure head according to claim 1, characterized in that: The main body (1) comprises a first end face (11) and a second end face (12) which are arranged opposite to each other, the first end face (11) being used to press a workpiece to be welded, and the second end face (12) being used to connect welding equipment; the main body (1) has a thickness direction (D), the first end face (11) and the second end face (12) are respectively located on both sides of the main body (1) along the thickness direction (D), and each of the through grooves (2) is arranged to penetrate in the thickness direction (D).

4. The welding pressure head according to claim 3, characterized in that: The second end surface (12) is provided with a plurality of fixing holes (5) for connecting and matching with the welding equipment.

5. The welding pressure head according to claim 3, characterized in that: A plurality of cut corners (4) are provided on the second end surface (12), each of the cut corners (4) is connected to a corresponding welding through groove (21), and the depth of the cut corner (4) is less than the depth of the welding through groove (21).

6. The welding pressure head according to claim 1, characterized in that: Each of the gas delivery structures (3) comprises an air inlet (31) and an exhaust channel (32), and the air inlet (31) and the exhaust channel (32) are both in communication with the corresponding welding through groove (21).

7. The welding pressure head according to claim 6, characterized in that The cross-sectional area of ​​the exhaust passage (32) is smaller than the cross-sectional area of ​​the air inlet (31).

8. The welding pressure head according to claim 6, characterized in that: The air inlet (31) comprises an inlet end (311) and an outlet end (312), wherein the inlet end (311) is used to be connected to an external air source, and the outlet end (312) is communicated with the welding groove (21); the main body (1) comprises a first end face (11) and a second end face (12), and along a thickness direction (D) of the main body (1), the inlet end (311) is arranged close to the second end face (12), and the outlet end (312) is arranged close to the first end face (11).

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