Welding head assembly and welding machine

Abstract

The utility model provides a welding head assembly and a welding machine. The welding head assembly comprises a metal welding head, a ceramic welding head and a slag suction piece. In the axial direction of the metal welding head, the ceramic welding head is detachably connected to one end of the metal welding head. The slag suction part is arranged on the metal welding head and used for sucking welding slag. Through the arrangement, the welding head assembly can be suitable for a common welding machine and can also be suitable for a pulse thermocompression welding machine, different welding heads of the welding head assembly can be replaced according to requirements, and the universality of the welding head assembly is improved. And the ceramic welding head has the characteristics of low possibility of oxidation, poor surface wettability, high wear resistance and the like, so that the welding quality can be improved, tin adhesion is avoided, the service life of the welding head assembly is prolonged, and the cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of welding equipment, and in particular to a welding head assembly and a welding machine. Background Art

[0002] Cost reduction and efficiency improvement have always been the theme of the development of the photovoltaic industry. Back-contact cells are a new type of battery technology that can improve the efficiency of cells and modules. Its main feature is that there is no grid line blocking the front of the cell, and the positive and negative electrodes of the cell are distributed on the back of the cell. The positive and negative electrodes include fine grid lines and PAD points (because the fine grid lines are too thin to withstand the welding pressure, a larger piece of metal needs to be connected and used as a support for welding, and this metal that withstands the pressure is the PAD point). In the process of interconnecting cells to modules, the welding ribbon is welded to the PAD point and welded using a hot press welding method.

[0003] Since hot pressing welding is a contact welding method, the hot pressing head will directly contact the soldering ribbon, and conventional hot pressing heads are prone to tinning. During the welding process, the hot pressing head that is stained with tin will affect the welding effect, and the falling tin slag will contaminate the battery cell and increase the risk of short circuit of the battery cell. In addition, the hot pressing head is generally made of metal material, and metal materials will be oxidized if they are exposed to the air for a long time, affecting the welding quality. At the same time, since hot pressing welding is a contact welding method, the hot pressing head is easily worn, so the hot pressing head needs to be replaced regularly, which increases the cost and affects the welding efficiency. Utility Model Content

[0004] The present disclosure provides a welding head assembly and a welding machine to solve the deficiencies in the related art.

[0005] According to a first aspect of an embodiment of the present disclosure, a welding head assembly is provided. The welding head assembly comprises a metal welding head, a ceramic welding head and a slag suction piece; in the axial direction of the metal welding head, the ceramic welding head is detachably connected to one end of the metal welding head; the slag suction piece is provided on the metal welding head, and the slag suction piece is used to absorb welding slag.

[0006] Optionally, the welding head assembly further includes a connecting sleeve; the connecting sleeve is sleeved on one end of the metal welding head, and a portion of the ceramic welding head is located in the connecting sleeve.

[0007] Optionally, the ceramic welding head includes a first end face and a mounting cavity recessed from the first end face; a portion of the metal welding head is disposed in the mounting cavity; or the metal welding head includes a second end face and a accommodating cavity recessed from the second end face; a portion of the ceramic welding head is clamped in the accommodating cavity.

[0008] Optionally, the slag suction component includes a slag suction component body and a slag collection shell; the slag suction component body is sleeved on the metal welding head; in the direction from the metal welding head to the ceramic welding head, the slag collection shell protrudes from the slag suction component body; the slag collection shell is spaced apart from the circumferential side of the metal welding head.

[0009] Optionally, the slag suction member body includes a welding slag receiving chamber, and the slag collecting shell includes a slag suction channel; the slag suction channel penetrates the slag collecting shell along the axial direction of the metal welding head and is communicated with the welding slag receiving chamber.

[0010] Optionally, a plurality of slag suction channels are provided, and are spaced apart along the circumference of the metal welding head in the slag collecting shell.

[0011] Optionally, the slag suction member further includes a one-way valve; the one-way valve is arranged in the slag suction channel; the one-way valve and the slag suction channel are arranged in a one-to-one correspondence.

[0012] Optionally, the slag suction component includes an air suction pipe and a filter; the air suction pipe is connected to the welding slag receiving chamber; and the filter is located between the air suction pipe and the welding slag receiving chamber.

[0013] Optionally, the slag suction part also includes a baffle; the baffle is arranged at one end of the slag collection shell away from the slag suction part body; at least a portion of the ceramic welding head protrudes out of the baffle; in the axial direction of the metal welding head, the projection of the baffle covers the projection of the slag collection shell; the slag suction channel passes through the baffle, and the slag suction channel located in the baffle is conical.

[0014] According to a second aspect of the embodiment of the present disclosure, a welding machine is further provided, comprising a welding machine body and the welding head assembly as described above, wherein the welding head assembly is connected to the welding machine body.

[0015] Compared with the prior art, the welding head assembly disclosed in the present invention can be applied to both ordinary welding machines and pulse hot pressing welding machines by detachably connecting the ceramic welding head to one end of the metal welding head, and the welding head assembly can be replaced with different welding heads according to needs, thereby improving the versatility of the welding head assembly. Since the ceramic welding head has the characteristics of being not easy to oxidize, having poor surface wettability and high wear resistance, it can improve the welding quality, avoid tin sticking, extend the service life of the welding head assembly, and reduce costs. The slag suction piece is used to absorb welding slag, thereby preventing tin slag from falling and contaminating the battery cell, thereby improving the safety of battery cell welding.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0018] Figure 1 is a perspective view of a welding head assembly according to an exemplary embodiment.

[0019] Figure 2 yes Figure 1 A perspective view of the welding head assembly from another perspective.

[0020] Figure 3 It is a schematic diagram showing the cooperation between a metal welding head and a ceramic welding head according to an exemplary embodiment.

[0021] Figure 4 is a schematic diagram showing the cooperation between a metal welding head and a ceramic welding head according to another exemplary embodiment.

[0022] Figure 5 yes Figure 1 Top view of the welding head assembly.

[0023] Figure 6 yes Figure 5 Cross-sectional view of the welding head assembly about AA.

[0024] Figure 7 The figure is a schematic diagram showing a welding head assembly welding a photovoltaic cell sheet according to an exemplary embodiment.

[0025] Figure 8 yes Figure 5 Side view of the welding head assembly welding photovoltaic cells.

[0026] Explanation of the accompanying drawings: 1-metal welding head; 11-second end face; 12-accommodating chamber; 2-ceramic welding head; 21-first end face; 22-installing chamber; 3-slag suction part; 31-slag suction part body; 311-welding slag receiving chamber; 32-slag collecting shell; 321-slag suction channel; 33-one-way valve; 34-intake pipe; 35-filter screen; 36-baffle; 4-connecting sleeve; 5-photovoltaic cell; 51-cell body; 52-PAD point; 6-welding strip. DETAILED DESCRIPTION

[0027] like Figure 1 and Figure 2As shown, the welding head assembly disclosed in the present invention includes a metal welding head 1, a ceramic welding head 2 and a slag suction part 3. In the axial direction of the metal welding head 1, the ceramic welding head 2 is detachably connected to one end of the metal welding head 1. Since the ceramic welding head 2 is connected to the metal welding head 1, the welding head assembly can be applied to both ordinary welding machines and pulse hot pressing welding machines. In addition, different welding heads can be replaced according to needs in the welding head assembly to improve the versatility of the welding head assembly. Since the ceramic welding head 2 is not easily oxidized and has a high wear resistance, it can improve the welding quality, avoid tin sticking, and extend the service life of the welding head assembly, thereby reducing costs.

[0028] In one embodiment, both the metal welding head 1 and the ceramic welding head 2 can be used for welding. The ceramic welding head 2 is connected to the metal welding head 1 in contact, so that the heat on the metal welding head 1 is transferred to the ceramic welding head 2 with maximum efficiency. The thermal conductivity of the ceramic welding head 2 is at least not less than 100W / (m˙k), and the material of the ceramic welding head 2 includes but is not limited to SiC, Si3N4 and BeO ceramics.

[0029] like Figure 3 As shown, part of the ceramic welding head 2 is embedded in the metal welding head 1. Specifically, the metal welding head 1 includes a second end face 11 and a receiving cavity 12. The receiving cavity 12 is recessed from the second end face 11, and part of the ceramic welding head 2 is located in the receiving cavity 12, and one end of the ceramic welding head 2 contacts the bottom wall of the receiving cavity 12, so that the heat on the metal welding head 1 is transferred to the ceramic welding head 2 with maximum efficiency.

[0030] like Figure 4 As shown, part of the metal welding head 1 can also be embedded in the ceramic welding head 2. Specifically, the ceramic welding head 2 includes a first end face 21 and a mounting cavity 22. The mounting cavity 22 is recessed from the first end face 21, and part of the metal welding head 1 is located in the mounting cavity 22, and one end of the metal welding head 1 contacts the bottom wall of the mounting cavity 22, so that the heat on the metal welding head 1 is transferred to the ceramic welding head 2 with maximum efficiency.

[0031] The ceramic welding head 2 and the metal welding head 1 can be fixed together by bonding, interference fit or bolt fit.

[0032] Further integration Figure 5 and Figure 6 As shown, in one embodiment, the welding head assembly includes a connecting sleeve 4. The ceramic welding head 2 and the metal welding head 1 are fixed by the connecting sleeve 4. Specifically, the connecting sleeve 4 is sleeved on one end of the metal welding head 1, and part of the ceramic welding head 2 is located in the connecting sleeve 4. The end face of the ceramic welding head 2 is in contact with the end face of the metal welding head 1, so that the heat on the metal welding head 1 is transferred to the ceramic welding head 2 with maximum efficiency.

[0033] Preferably, the diameter of the ceramic welding head 2 is equal to the diameter of the metal welding head 1. This arrangement reduces the difficulty of manufacturing the connecting sleeve 4 and ensures the heat transfer efficiency between the ceramic welding head 2 and the metal welding head 1.

[0034] It is true that there is a difference between the diameter of the ceramic welding head 2 and the diameter of the metal welding head 1, and the connecting sleeve 4 can be compatible with the ceramic welding head 2 and the metal welding head 1. When the ceramic welding head 2 and the metal welding head 1 are installed, the one with the smaller diameter is preferentially arranged in the connecting sleeve 4, and the diameter difference can be used to limit the position in the connecting sleeve 4 so that it can be installed in place in one step. Then, the one with the larger diameter of the ceramic welding head 2 and the metal welding head 1 is installed in the connecting sleeve 4, and can then directly contact the one with the smaller diameter to improve the installation efficiency.

[0035] In one embodiment, the slag suction member 3 is provided on the metal welding head 1, and the slag suction member 3 is used to absorb welding slag, thereby preventing the tin slag from falling and contaminating the battery cell and causing the battery cell short circuit problem, thereby improving the safety of battery cell welding. The slag suction member 3 is integrated into the metal welding head 1, which can reduce the volume of the entire welding head assembly, especially the volume of the metal welding head 1 and the ceramic welding head 2, thereby reducing the manufacturing cost.

[0036] The slag suction member 3 comprises a slag suction member body 31, a slag collecting shell 32, a one-way valve 33, an air suction pipe 34, a filter screen 35 and a baffle 36. The slag suction member body 31 is sleeved on the metal welding head 1 and can be used to absorb and store welding slag.

[0037] In the direction from the metal welding head 1 to the ceramic welding head 2, the slag collecting shell 32 is protruded from the slag suction part body 31, and at least part of the ceramic welding head 2 protrudes from the slag collecting shell 32, so that the ceramic welding head 2 contacts the welding part. The slag collecting shell 32 is spaced apart from the peripheral side of the metal welding head 1, thereby providing an installation space for the connecting sleeve 4. Preferably, the connecting sleeve 4 is tightly engaged between the slag collecting shell 32 and the metal welding head 1 to prevent the splashing welding slag from entering the gap between the slag collecting shell 32 and the metal welding head 1.

[0038] The slag suction member body 31 includes a slag receiving chamber 311, and the slag collecting shell 32 includes a slag suction channel 321. The slag suction channel 321 penetrates the slag collecting shell 32 along the axial direction of the metal welding head 1 and is connected to the slag receiving chamber 311. The welding slag generated during welding of the welding head assembly can enter the slag receiving chamber 311 through the slag suction channel 321.

[0039] In order to improve the degree of absorption of welding slag by the slag absorption part 3, a plurality of slag absorption channels 321 are provided, and are arranged at intervals along the circumference of the metal welding head 1 in the slag collection shell 32. The plurality of slag absorption channels 321 are all connected to the welding slag receiving chamber 311. The one-way valve 33 is arranged in the slag absorption channel 321 to prevent the welding slag in the welding slag receiving chamber 311 from leaking out of the slag absorption channel 321. Specifically, when the slag absorption channel 321 absorbs welding slag, the one-way valve 33 is opened, and when the slag absorption channel 321 finishes absorbing welding slag, the one-way valve 33 is closed. The one-way valve 33 is arranged in a one-to-one correspondence with the slag absorption channel 321.

[0040] The welding slag storage chamber 311 is provided with an opening (not shown), and the welding slag in the welding slag storage chamber 311 can be poured out through the opening. Indeed, the welding slag storage chamber 311 is also a shell detachably connected to the slag suction member body 31. After the welding slag is stored in the welding slag storage chamber 311 to a certain extent, the welding slag storage chamber 311 can be replaced to allow the slag suction member 3 to continue working. In this way, the slag suction member 3 can efficiently absorb the welding slag.

[0041] The air suction pipe 34 is connected to the welding slag receiving chamber 311, and the filter 35 is located between the air suction pipe 34 and the welding slag receiving chamber 311 to prevent the welding slag in the welding slag receiving chamber 311 from entering the air suction pipe 34 and damaging the air pump. In another embodiment, the filter 35 can also be located in the air suction pipe 34.

[0042] The baffle 36 is disposed at one end of the slag collecting shell 32 away from the slag suction member body 31. In the axial direction of the metal welding head 1, at least part of the ceramic welding head 2 protrudes out of the baffle 36, so that the ceramic welding head 2 can contact the welding part. Further, according to actual needs, part of the metal welding head 1 can also protrude out of the baffle 36.

[0043] In the axial direction of the metal welding head 1, the projection of the baffle 36 covers the projection of the slag collecting shell 32. In this way, the baffle 36 can resist the welding slag and prevent the welding slag from splashing. The cross-sections of the slag collecting shell 32 and the baffle 36 are preferably circular, and the outer diameter of the baffle 36 is greater than the outer diameter of the slag collecting shell 32.

[0044] The slag suction channel 321 passes through the baffle 36 from the slag collecting shell 32. Specifically, the outlet end of the slag suction channel 321 is connected to the welding slag receiving chamber 311, and the inlet end is located in the baffle 36. The slag suction channel 321 located in the baffle 36 is conical, that is, the diameter of the inlet end of the slag suction channel 321 increases in the direction from the metal welding head 1 to the ceramic welding head 2. In this way, the volume of the inlet end of the slag suction channel 321 is increased, and the efficiency of sucking welding slag is improved.

[0045] The welding head assembly disclosed in the present invention is preferably used for, but not limited to, welding a photovoltaic cell 5. Specifically, the photovoltaic cell 5 includes a cell body 51 and a PAD point 52 provided on the cell body 51. The welding head assembly uses a welding ribbon 6 to perform welding at the PAD point 52. For details, please refer to Figure 7 and Figure 8 .

[0046] The welding head assembly disclosed in the present invention is provided with a ceramic welding head 2 on a metal welding head 1, so that the welding head assembly can be applied to a pulse hot pressing welding machine, and because the ceramic welding head 2 is not easily oxidized, has poor surface wettability, and has a high wear resistance, the welding quality of the welding head assembly can be improved, tin sticking can be avoided, and the service life of the welding head assembly can be extended. The slag suction part 3 is provided on the metal welding head 1, so that the slag suction part 3 can be integrated into the metal welding head 1, greatly reducing the volume of the welding head assembly, so that the welding head assembly can be applied to the precision welding of the PAD points of the battery cell mm (millimeter) level.

[0047] The present disclosure also provides a welding machine, including a welding machine body and a welding head assembly as described above, wherein the welding head assembly is connected to the welding machine body. The welding machine disclosed in the present disclosure can improve the welding quality of the welding machine, avoid tin sticking, and extend the service life of the welding head assembly by providing the welding head assembly. In addition, the welding machine can absorb welding slag to avoid the tin slag falling and contaminating the battery cell, causing the battery cell short circuit and other problems, thereby improving the safety of battery cell welding.

Claims

1. A welding head assembly, characterized in that: include: Metal welding heads, ceramic welding heads and slag suction parts; In the axial direction of the metal welding head, the ceramic welding head is detachably connected to one end of the metal welding head; the slag suction piece is arranged on the metal welding head, and the slag suction piece is used to absorb welding slag.

2. The welding head assembly according to claim 1, characterized in that: The welding head assembly also includes a connecting sleeve; the connecting sleeve is sleeved on one end of the metal welding head, and a part of the ceramic welding head is located in the connecting sleeve.

3. The welding head assembly according to claim 1, characterized in that: The ceramic welding head comprises a first end surface and a mounting cavity recessed from the first end surface; a portion of the metal welding head is disposed in the mounting cavity; or The metal welding head comprises a second end surface and a receiving cavity recessed from the second end surface; a part of the ceramic welding head is clamped in the receiving cavity.

4. The welding head assembly according to claim 1, characterized in that: The slag suction piece includes a slag suction piece body and a slag collection shell; the slag suction piece body is sleeved on the metal welding head; in the direction from the metal welding head to the ceramic welding head, the slag collection shell protrudes from the slag suction piece body; the slag collection shell is spaced from the circumference of the metal welding head.

5. The welding head assembly according to claim 4, characterized in that: The slag suction member body comprises a welding slag receiving chamber; the slag collecting shell comprises a slag suction channel; the slag suction channel penetrates the slag collecting shell along the axial direction of the metal welding head and is communicated with the welding slag receiving chamber.

6. The welding head assembly according to claim 5, characterized in that: A plurality of slag suction channels are provided, and are spaced apart in the slag collecting shell along the circumferential direction of the metal welding head.

7. The welding head assembly according to claim 5, characterized in that: The slag suction member further comprises a one-way valve; the one-way valve is arranged in the slag suction channel; the one-way valve and the slag suction channel are arranged in a one-to-one correspondence.

8. The welding head assembly according to claim 5, characterized in that: The slag suction component includes an air suction pipe and a filter screen; the air suction pipe is communicated with the welding slag receiving chamber; and the filter screen is located between the air suction pipe and the welding slag receiving chamber.

9. The welding head assembly according to claim 5, characterized in that: The slag suction piece also includes a baffle; the baffle is arranged at one end of the slag collection shell away from the slag suction piece body; at least a portion of the ceramic welding head protrudes out of the baffle; in the axial direction of the metal welding head, the projection of the baffle covers the projection of the slag collection shell; the slag suction channel runs through the baffle, and the slag suction channel located in the baffle is conical.

10. A welding machine, characterized in that: The invention comprises a welding machine body and a welding head assembly according to any one of claims 1 to 9, wherein the welding head assembly is connected to the welding machine body.

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