Welding press and welding apparatus

Abstract

The embodiment of the application provides a welding press and a welding device, the welding press comprises a main body, a plurality of first pressing parts are arranged at intervals on the main body along a first direction, a plurality of first pressing needles are arranged at intervals on the first pressing part along a second direction; an auxiliary part, one end of the auxiliary part is provided with a second pressing part along the first direction, a plurality of second pressing needles are arranged at intervals on the second pressing part along the second direction; the auxiliary part is provided with an accommodating space, the accommodating space is used for accommodating the main body, so that the auxiliary part can be fitted on the outside of the main body; the first direction and the second direction are perpendicular to each other. After the welding strip traction device releases the welding strip, the auxiliary part can press the end part of the welding strip originally clamped by the welding strip traction device on the battery piece, not only can improve the welding quality of the battery string, but also can increase the effective connection length of the welding strip and the main grid of the battery piece, thereby being favorable to improving the power generation efficiency of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell manufacturing technology, specifically to a welding fixture and welding equipment. Background Technology

[0002] In photovoltaic modules, adjacent solar cells are welded to the same solder strip to achieve series or parallel connection between adjacent cells. The solder strip plays the role of collecting and transmitting current. During the welding process, the end of the solder strip is prone to curling up, causing the end of the solder strip to not adhere to the solar cell. This reduces the effective welding length between the solder strip and the solar cell, affecting the welding quality and thus reducing the efficiency of the solder strip in collecting current from the solar cell, thereby impacting the efficiency of the photovoltaic module. Summary of the Invention

[0003] In view of this, this application provides a welding press and welding equipment to solve the problem of weld strips easily curling up in the prior art.

[0004] In a first aspect, embodiments of this application provide a welding press, comprising: a main body, wherein a plurality of first pressing portions are spaced apart along a first direction, and a plurality of first pressing pins are spaced apart along a second direction; an auxiliary component, wherein a second pressing portion is provided at one end along the first direction, and a plurality of second pressing pins are spaced apart along the second direction; the auxiliary component is provided with a receiving space for accommodating the main body so that the auxiliary component can be fitted onto the outside of the main body; the first direction and the second direction are perpendicular to each other.

[0005] In this embodiment, by setting the welding press as a separate, interlocking main body and auxiliary parts, the end of the welding strip originally held by the welding strip traction device can be pressed onto the solar cell after the welding strip is released by the welding strip traction device. This not only improves the welding quality of the solar cell string, but also increases the effective connection length between the welding strip and the main grid of the solar cell, thereby helping to improve the power generation efficiency of the photovoltaic module.

[0006] In one possible implementation, in the first direction, a third pressing part is provided at the end of the auxiliary component away from the second pressing part, and a plurality of third pressing pins are provided at intervals on the third pressing part along the second direction; the second pressing pin and the third pressing pin are respectively used to press the solder strips on two adjacent battery cells.

[0007] In one possible implementation, the bottom of the main body is provided with a first magnetic attraction element; and / or, the bottom of the auxiliary component is provided with a second magnetic attraction element.

[0008] In one possible implementation, the first pressure needle is retractably connected to the first pressing part; and / or, the second pressure needle is retractably connected to the second pressing part; and / or, the third pressure needle is retractably connected to the third pressing part.

[0009] Secondly, embodiments of this application provide a welding apparatus, comprising: a welding device for welding a welding strip onto a battery cell; a conveying device for conveying the battery cell and the welding strip to the welding device; a battery cell gripping device for placing the battery cell onto the conveying device; a welding strip traction device for laying the welding strip onto the surface of the battery cell; a welding press for pressing the welding strip onto the weld points on the surface of the battery cell, the welding press comprising a main body and an auxiliary component fitted with the main body; the press gripping device for placing the main body onto the welding strip so that the welding strip is pressed tightly against at least a portion of the weld points on the battery cell; the press gripping device is further configured to, after the welding strip traction device releases the welding strip, fit the auxiliary component onto the outside of the main body so that the welding strip is pressed tightly against the remaining weld points on the battery cell.

[0010] Thirdly, embodiments of this application provide a welding press, comprising: a main body, wherein a plurality of first pressing portions are spaced apart along a first direction, and a plurality of first pressing pins are spaced apart along a second direction; an auxiliary component, movably mounted on one end of the main body along the first direction, the auxiliary component being able to approach or move away from the main body along the first direction, the auxiliary component being provided with a second pressing portion, and a plurality of second pressing pins being spaced apart along the second direction; the first direction and the second direction are perpendicular to each other.

[0011] In one possible implementation, the auxiliary component is elastically connected to the main body via an elastic element.

[0012] In one possible implementation, a first magnetic attraction element is provided at the bottom of the main body.

[0013] In one possible implementation, the first pressure needle is retractably connected to the first pressing part; and / or, the second pressure needle is retractably connected to the second pressing part.

[0014] Fourthly, embodiments of this application provide a welding apparatus, comprising: a welding device for welding a welding strip onto a battery cell; a conveying device for conveying the battery cell and the welding strip to the welding device; a battery cell gripping device for placing the battery cell onto the conveying device; a welding strip traction device for laying the welding strip onto the surface of the battery cell; a welding press for pressing the welding strip onto weld points on the surface of the battery cell, the welding press comprising a main body and an auxiliary component movably mounted on the main body; and a press gripping device for placing the welding press onto the welding strip; wherein the main body is used to press the welding strip onto at least a portion of the weld points on the battery cell, and the auxiliary component is used to move away from the main body in a first direction after the welding strip traction device releases the welding strip, so as to press the welding strip onto the remaining weld points on the battery cell.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the welding press provided in this application in a first specific embodiment;

[0018] Figure 2 for Figure 1 A schematic diagram of the main structure in the diagram;

[0019] Figure 3 for Figure 1 A schematic diagram of the auxiliary components in the process;

[0020] Figure 4 for Figure 1 A schematic diagram of a welding press used to clamp the welding strip;

[0021] Figure 5 for Figure 2 A cross-sectional structural diagram of the first clamping part in the middle;

[0022] Figure 6 for Figure 3 A cross-sectional structural diagram of the second clamping part in the middle;

[0023] Figure 7 for Figure 3 A cross-sectional structural diagram of the third clamping part;

[0024] Figure 8 for Figure 5 A partial cross-sectional view of the first clamping part in another embodiment;

[0025] Figure 9 for Figure 6 A partial cross-sectional view of the second clamping part in another embodiment;

[0026] Figure 10 for Figure 7 A partial cross-sectional view of the third clamping part in another embodiment;

[0027] Figure 11 A schematic diagram of the welding press provided in this application in a second specific embodiment;

[0028] Figure 12 for Figure 11 A schematic diagram of the welding press in another state;

[0029] Figures 13(a)-13(b) for Figure 11 The diagram shows the structure of the welding press used to press the welding strip.

[0030] Figure label:

[0031] 1-Main body;

[0032] 11-First clamping part;

[0033] 111 - First pressure needle;

[0034] 111a - First limiting part;

[0035] 111b - First Body Section;

[0036] 111c - First pressure needle section;

[0037] 112 - First spring;

[0038] 2-Auxiliary components;

[0039] 21-Second clamping part;

[0040] 211 - Second pressure needle;

[0041] 211a - Second limiting part;

[0042] 211b - Second body section;

[0043] 211c - Second pressure needle section;

[0044] 212 - Second spring;

[0045] 22-Third clamping part;

[0046] 221 - Third pressure needle;

[0047] 221a - Third limiting part;

[0048] 221b - Third Body Section;

[0049] 221c - Third pressure needle section;

[0050] 222 - Third spring;

[0051] 23 - Accommodation space;

[0052] 3-Elastic element;

[0053] 4-Battery cells;

[0054] 5-Welding strip;

[0055] 6- Welding strip traction device. Detailed Implementation

[0056] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0057] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0058] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0059] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the manufacturing process of photovoltaic modules, multiple solar cells are sequentially connected to form a cell string using welding ribbons. The welding points on the front of one cell are used to weld to one end of the welding ribbon, while the welding points on the back of the adjacent cell are used to weld to the other end of the welding ribbon. During the welding process, the welding ribbon is typically pulled and laid on the surface of the solar cell by grippers or other clamping equipment, and then pressed onto the welding points on the cell surface by a welding press. The grippers do not interfere with the welding press, ensuring the welding press firmly presses the welding ribbon onto the welding points. However, after the welding ribbon is released by the traction device, the end of the welding ribbon that was previously held by the traction device, without the welding press, cannot be pressed firmly onto the cell surface, easily resulting in curling or bending. When this length of welding ribbon is welded to the cell, it easily causes incomplete welds, missed welds, and exposed areas, severely affecting the welding quality of the cell string and ultimately impacting the power generation efficiency of the photovoltaic module.

[0061] To address the aforementioned problems, this application provides a welding device, including a welding apparatus, a conveying apparatus, a battery cell gripping apparatus, a welding strip traction device 6, a welding fixture, and a fixture gripping apparatus. The battery cell gripping apparatus includes a robotic arm or other movable gripping and releasing mechanism for gripping the battery cell 4 and placing it on the conveying apparatus; the welding strip traction device 6 includes grippers or other movable gripping and releasing mechanisms for laying the welding strip 5 on the surface of the battery cell 4; the welding fixture is used to press the welding strip 5 firmly onto the weld points on the surface of the battery cell 4, such as... Figure 1 As shown, the welding fixture includes a main body 1 and an auxiliary component 2 that fits with the main body 1; the fixture gripping device is used to place the main body 1 on the welding strip 5 so that the welding strip 5 is pressed tightly against at least some of the welding points on the battery cell 4; the fixture gripping device is also used to fit the auxiliary component 2 on the outside of the main body 1 after the welding strip traction device releases the welding strip 5, so that the end of the welding strip 5 originally held by the welding strip traction device 6 can be pressed tightly against the remaining welding points on the battery cell 4, reducing the risk of the end of the welding strip 5 curling or bending; the conveying device includes a conveyor belt or other form of conveying mechanism, used to convey the battery cell 4 with the welding strip 5 laid on it and the welding fixture pressing on its surface together to the welding device; the welding device is used to weld the welding strip 5 onto the battery cell 4 to realize the series connection between the battery cells 4 to form a battery string.

[0062] The specific structure of this welding fixture is described below, such as... Figure 2 As shown, along the first direction X, the main body 1 is provided with a plurality of first pressing parts 11 at intervals, and along the second direction Y, a plurality of first pressing pins 111 are provided at intervals on the first pressing parts 11. The first direction X and the second direction Y are perpendicular to each other. Specifically, the first direction X can be the width direction of the welding press, and it is also the extension direction of the main grid on the battery cell 4; the second direction Y can be the length direction of the welding press, and it is also perpendicular to the extension direction of the main grid on the battery cell 4.

[0063] When the main body 1 presses the welding strip 5 on the surface of the battery cell 4, the first pressure pins 111 on the same first pressing part 11 are used to press different welding strips 5. Therefore, the number of first pressure pins 111 on the same first pressing part 11 should be greater than or equal to the number of welding strips 5 laid on the battery cell 4. Since the welding strip 5 is connected to the main grid of the battery cell 4 in a one-to-one correspondence, the number of first pressure pins 111 on the same first pressing part 11 should be greater than or equal to the number of main grids on the battery cell 4. When multiple first pressing parts 11 are arranged at intervals along the first direction X, the main body 1 can simultaneously press multiple points of the same welding strip 5 onto the main grid of the battery cell 4, improving the stability of the welding press pressing the welding strip 5, preventing the welding strip 5 from shifting during subsequent transportation, and also increasing the contact area between the welding strip 5 and the main grid of the battery cell 4, thereby improving the welding effect of the welding strip 5 and the welding points on the main grid.

[0064] like Figure 3 As shown, along the first direction X, one end of the auxiliary component 2 is provided with a second pressing part 21, and along the second direction Y, a plurality of second pressing pins 211 are provided at intervals on the second pressing part 21. The auxiliary component 2 is provided with a receiving space 23, which is used to receive the main body 1 so that the auxiliary component 2 can be fitted onto the outside of the main body 1. After the welding strip traction device 6 releases the end of the welding strip 5, the clamping device can fit the auxiliary component 2 onto the outside of the main body 1. At this time, the second pressing part 21 is used to press the part of the welding strip 5 that was originally clamped by the welding strip traction device 6 onto the battery cell 4, reducing the risk of the welding strip 5 lifting or bending, thereby helping to reduce the risk of incomplete welding, missing welding, or exposed white areas when the welding strip 5 is welded to the battery cell 4.

[0065] The number of second pressing parts 21 can be one or more, and the multiple second pressing parts 21 can be arranged at intervals along the first direction X. This embodiment does not limit this. Each second pressing part 21 includes multiple second pressing pins 211, which are used to press different solder strips 5 respectively. The number of second pressing pins 211 on the same second pressing part 21 should be greater than or equal to the number of solder strips 5 laid on the battery cell 4. Since the solder strips 5 are connected to the main grids of the battery cell 4 in a one-to-one correspondence, the number of second pressing pins 211 on the same second pressing part 21 should be greater than or equal to the number of main grids on the battery cell 4.

[0066] The welding press provided in this application embodiment, by setting the welding press as a separate, interlocking main body 1 and auxiliary part 2, can press the end of the welding strip 5 originally held by the welding strip traction device 6 onto the solar cell 4 after the welding strip 5 is released by the welding strip traction device 6. This not only improves the welding quality of the solar cell string, but also increases the effective connection length between the welding strip 5 and the main grid of the solar cell 4, thereby helping to improve the power generation efficiency of the photovoltaic module.

[0067] Furthermore, existing welding fixtures are all designed to avoid the welding strip traction device 6, and therefore cannot press down the end of the welding strip 5 held by the welding strip traction device 6. Correspondingly, the welding points on the solar cell 4 are all located in positions that the welding fixture can cover, meaning that the welding point positions on the solar cell 4 also avoid the welding strip traction device 6 to ensure that the welding strip 5 can be accurately connected to the welding points on the solar cell 4. However, this structure of the solar cell 4 results in a short effective connection length between the welding strip 5 and the solar cell 4, leading to a low power generation efficiency of the photovoltaic module. The auxiliary component 2 of the welding fixture provided in this application can press the welding strip 5 onto the solar cell 4 after the welding strip traction device 6 releases it. Therefore, welding points can also be set on the part of the solar cell 4 that was originally covered by the welding strip traction device 6 (i.e., the part covered by the auxiliary component 2) to connect with the welding strip 5 that was originally held by the welding strip traction device 6, increasing the effective connection length between the welding strip 5 and the main grid of the solar cell 4, thereby increasing the current collection capability of the welding strip 5 at the edge of the solar cell 4, and thus improving the power generation efficiency of the photovoltaic module. Therefore, using the welding fixture provided in this embodiment helps to move the end weld points of the battery cell 4 outward. The welding fixture and the welding equipment including the welding fixture can be applied to battery cells 4 with various structures and sizes, and does not limit the structure of the end weld points of the battery cell 4. The end weld points of the battery cell 4 can be a harpoon structure or a straight structure, both of which can be adapted to the welding fixture.

[0068] For welding equipment, the welding press provided in this embodiment does not require modification of existing welding equipment or additional robotic arms. The original press gripping device can be used to achieve the separate placement of the main body 1 and auxiliary parts 2, which can save the manufacturing cost of photovoltaic modules.

[0069] In one specific implementation, such as Figure 3 As shown, along the first direction X, a third pressing part 22 is provided at the end of the auxiliary part 2 away from the second pressing part 21. Along the second direction Y, a plurality of third pressing pins 221 are provided at intervals on the third pressing part 22. The second pressing pins 211 and the third pressing pins 221 are respectively used to press the welding strips 5 on two adjacent battery cells 4.

[0070] like Figure 4As shown, the second clamping part 21 and the third clamping part 22 form a receiving space 23, so that the auxiliary component 2 forms a frame structure. The second clamping part 21 is used to press the ends of one set of welding strips 5 onto the surface of the solar cell 4, and the third clamping part 22 is used to press the ends of another set of welding strips 5 onto the surface of another adjacent solar cell 4, so that one auxiliary component 2 can be used to press two adjacent solar cells 4, that is, one auxiliary component 2 can be used simultaneously with two adjacent main bodies 1. In the welding process of the solar cell 4, only one auxiliary component 2 needs to be placed for every two main bodies 1, saving the amount of auxiliary component 2 used, and also improving the placement efficiency of the welding press, which in turn helps to improve the manufacturing efficiency of photovoltaic modules.

[0071] The number of third pressing parts 22 can be one or more, and the multiple third pressing parts 22 can be arranged at intervals along the first direction X. This embodiment does not limit this. Each third pressing part 22 includes multiple third pressing pins 221, which are used to press different solder strips 5 respectively. The number of third pressing pins 221 on the same third pressing part 22 should be greater than or equal to the number of solder strips 5 laid on the battery cell 4. Since the solder strips 5 are connected one-to-one with the main grids of the battery cell 4, the number of third pressing pins 221 on the same third pressing part 22 should be greater than or equal to the number of main grids on the battery cell 4.

[0072] In one specific implementation, such as Figure 5 As shown, the first pressure pin 111 can be fixedly connected to the first pressing part 11 to improve the connection strength and stability between the first pressure pin 111 and the first pressing part 11, and reduce the risk of the first pressure pin 111 falling off; as Figure 6 As shown, the second pressure pin 211 can be fixedly connected to the second pressing part 21 to improve the connection strength and stability between the second pressure pin 211 and the second pressing part 21, and reduce the risk of the second pressure pin 211 falling off; as Figure 7 As shown, the third pressure pin 221 can be fixedly connected to the third pressing part 22 to improve the connection strength and connection stability between the third pressure pin 221 and the third pressing part 22.

[0073] In another specific embodiment, the first pressure needle 111 is retractably connected to the first pressing part 11, and / or the second pressure needle 211 is retractably connected to the second pressing part 21, and / or the third pressure needle 221 is retractably connected to the third pressing part 22.

[0074] like Figure 8As shown, the first pressing needle 111 includes a first limiting part 111a, a first body part 111b, and a first pressing needle part 111c. The first body part 111b is movably inserted into the first pressing part 11. The diameter of the first limiting part 111a is larger than that of the first body part 111b and is located on the upper surface of the first pressing part 11. It is used to form a limiting fit with the upper surface of the first pressing part 11 to prevent the first pressing needle 111 from coming out of the first pressing part 11. The diameter of the first pressing needle part 111c is larger than that of the first body part 111b and is located at the end of the first body part 111b away from the first limiting part 111a. It is used to abut against the solder ribbon 5 to press the solder ribbon 5 onto the surface of the battery cell 4. Specifically, a first spring 112 is sleeved on the first body part 111b. The two ends of the first spring 112 abut against the lower surface of the first pressing part 11 and the first pressing needle part 111c, respectively, so that an elastic connection structure is formed between the first pressing needle 111 and the first pressing part 11. The first pressing needle 111 is equivalent to a spring pressing needle. The first pressing needle 111 can extend or retract relative to the first pressing part 11. At this time, by adjusting the compression amount of the first spring 112, the pressure applied by the first pressing needle 111 to the welding strip 5 can be changed, ensuring that the first pressing needle 111 can press the welding strip 5 tightly, so that the welding strip 5 and the battery cell 4 can fully contact each other, effectively avoiding poor welding, and also improving the flexibility of the first pressing needle 111 and the welding strip 5.

[0075] like Figure 9 As shown, the second pressure needle 211 includes a second limiting part 211a, a second body part 211b, and a second pressure needle part 211c. The second body part 211b is movably inserted into the second pressing part 21. The diameter of the second limiting part 211a is larger than that of the second body part 211b, and it is located on the upper surface of the second pressing part 21. It is used to form a limiting fit with the upper surface of the second pressing part 21 to prevent the second pressure needle 211 from coming out of the second pressing part 21. The diameter of the second pressure needle part 211c is larger than that of the second body part 211b, and it is located at the end of the second body part 211b away from the second limiting part 211a. It is used to abut against the solder ribbon 5 to press the solder ribbon 5 onto the surface of the battery cell 4. Specifically, a second spring 212 is sleeved on the second body part 211b. The two ends of the second spring 212 abut against the lower surface of the second pressing part 21 and the second pressing needle part 211c, respectively, so that an elastic connection structure is formed between the second pressing needle 211 and the second pressing part 21. The second pressing needle 211 is equivalent to a spring pressing needle. The second pressing needle 211 can extend or retract relative to the second pressing part 21. At this time, by adjusting the compression of the second spring 212, the pressure applied by the second pressing needle 211 to the welding strip 5 can be changed, ensuring that the second pressing needle 211 can press the welding strip 5 tightly, so that the welding strip 5 and the battery cell 4 can fully contact each other, effectively avoiding poor welding, and also improving the flexibility of the cooperation between the second pressing needle 211 and the welding strip 5.

[0076] like Figure 10As shown, the third pressure needle 221 includes a third limiting part 221a, a third body part 221b, and a third pressure needle part 221c. The third body part 221b is movably inserted into the third pressing part 22. The diameter of the third limiting part 221a is larger than that of the third body part 221b, and it is located on the upper surface of the third pressing part 22. It is used to form a limiting fit with the upper surface of the third pressing part 22 to prevent the third pressure needle 221 from coming out of the third pressing part 22. The diameter of the third pressure needle part 221c is larger than that of the third body part 221b, and it is located at the end of the third body part 221b away from the third limiting part 221a. It is used to abut against the solder ribbon 5 to press the solder ribbon 5 onto the surface of the battery cell 4. Specifically, a third spring 222 is sleeved on the third body part 221b. The two ends of the third spring 222 abut against the lower surface of the third pressing part 22 and the third pressing needle part 221c, respectively, so that an elastic connection structure is formed between the third pressing needle 221 and the third pressing part 22. The third pressing needle 221 is equivalent to a spring pressing needle. The third pressing needle 221 can extend or retract relative to the third pressing part 22. At this time, by adjusting the compression of the third spring 222, the pressure applied by the third pressing needle 221 to the welding strip 5 can be changed, ensuring that the third pressing needle 221 can press the welding strip 5 tightly, so that the welding strip 5 and the battery cell 4 can fully contact each other, effectively avoiding poor welding, and also improving the flexibility of the cooperation between the third pressing needle 221 and the welding strip 5.

[0077] In summary, at least one of the first pressure pin 111, the second pressure pin 211, and the third pressure pin 221 can adopt the above-described structure to form a spring pressure pin, thereby improving the clamping effect of the welding fixture on the welding strip 5. When all three pressure pins 111, 211, and 221 adopt the above-described structure to form spring pressure pins, the clamping effect of the welding fixture on the welding strip 5 can be significantly improved, which is beneficial to improving the connection effect between the welding strip 5 and the solar cell 4, and thus beneficial to improving the power generation efficiency of the photovoltaic module.

[0078] In one specific embodiment, a first magnetic attractor is provided at the bottom of the main body 1, and / or a second magnetic attractor is provided at the bottom of the auxiliary component 2. Specifically, the first magnetic attractor can be provided all over the bottom of the main body 1, or it can be provided at the bottom of both ends of the main body 1 along the second direction X (i.e., the parts where the first pressure pin 111 is not provided). Correspondingly, a structure that magnetically engages with the first magnetic attractor can be provided at the corresponding position of the conveyor belt in the conveying device, so that the main body 1 can move synchronously with the conveyor belt, so that the main body 1 can more stably press the welding strip 5 and prevent the main body 1 from shifting during the conveying process. The first magnetic attractor located at the bottom of the main body 1 can be a magnet or other magnetic structure, or the entire main body 1 can be made of magnetic material, while the magnetic structure on the conveyor belt can be a magnet or sheet metal.

[0079] Similarly, the second magnetic attractor can be provided on the entire bottom of the auxiliary component 2, or it can be provided at the bottom of both ends of the auxiliary component 2 along the second direction X (i.e., the parts where the second pressure pin 211 and the third pressure pin 221 are not provided). Correspondingly, a structure that magnetically engages with the second magnetic attractor can be provided at the corresponding position of the conveyor belt in the conveying device, so that the auxiliary component 2 can move synchronously with the conveyor belt, so that the auxiliary component 2 can more stably press the welding strip 5 and prevent the auxiliary component 2 from shifting during the conveying process. The second magnetic attractor located at the bottom of the auxiliary component 2 can be a magnet or other magnetic structure, or the entire auxiliary component 2 can be made of magnetic material, while the magnetic structure on the conveyor belt can be a magnet or sheet metal.

[0080] When the bottom of the main body 1 is provided with a first magnetic suction component and the bottom of the auxiliary component 2 is provided with a second magnetic suction component, the overall stability of the welding press can be improved, thereby improving the overall pressing effect of the welding press on the welding strip 5 and preventing the welding press from shifting during the transmission process.

[0081] When the welding equipment uses the welding press described in the above embodiments, the welding process steps are as follows: The cell gripping device first places a cell 4 face up on the conveyor belt of the conveyor device; the welding strip traction device 6 lays the welding strip 5 along the first direction X from one end of the cell 4 to the other end, and then the welding strip traction device 6 clamps one end of the welding strip 5 and lowers it as a whole to the end of the cell 4; the press gripping device grips the main body 1 and places the main body 1 on the part of the cell 4 that is not covered by the welding strip traction device 6, so as to press the welding strip 5 tightly against the front of the cell; the welding strip traction device 6 releases the welding strip 5 and moves it away from above the cell 4; the above steps are repeated to complete the pressing of another cell 4 and the welding strip 5, while making the back of the other cell 4 cover the other end of the welding strip 5 (e.g., Figure 4 As shown in the diagram, one end of the welding strip 5 is pressed against the front of the first battery cell 4, and the other end of the welding strip 5 is pressed against the back of the second battery cell 4. The clamping device grips the auxiliary component 2 and fits it onto the outside of the main body 1, so that the second clamping part 21 presses the set of welding strips 5 originally held by the welding strip traction device 6 against the end of the first battery cell 4, while the third clamping part 22 presses the other set of welding strips 5 originally held by the welding strip traction device 6 against the end of the second battery cell 4. Following the above steps, with each battery cell 4 requiring one main body 1 and every two battery cells 4 requiring one auxiliary component 2, the required number of battery cells 4 and their welding strips 5 are arranged on the conveying device, and finally fed into the welding device for welding.

[0082] Specifically, the welding device can use an infrared light source as a heat source to irradiate and heat the solder ribbon 5 and the battery cell 4 through the hollow area in the welding fixture (the gap between the first clamping part 11, the second clamping part 21, and the third clamping part 22), causing the solder on the solder ribbon 5 to melt and thus weld it to the solder joint on the main grid of the battery cell 4. The main body 1, the auxiliary component 2, and its pressure pins can all be made of light-transmitting or heat-conducting materials to reduce the absorption of heat from the heat source, thereby transferring more heat to the solder ribbon 5 and the battery cell 4.

[0083] This application embodiment also provides a welding device, including a welding apparatus, a conveying apparatus, a battery cell gripping device, a welding strip traction device 6, a welding fixture, and a fixture gripping device. The battery cell gripping device includes a robotic arm or other form of movable gripping and releasing mechanism for gripping the battery cell 4 and placing it on the conveying apparatus; the welding strip traction device 6 includes grippers or other form of movable gripping and releasing mechanism for laying the welding strip 5 on the surface of the battery cell 4; the fixture gripping device is used to place the welding fixture on the welding strip 5; the welding fixture is used to press the welding strip 5 firmly onto the weld points on the surface of the battery cell 4, such as... Figure 11 As shown, the welding press includes a main body 1 and an auxiliary component 2 movably mounted on the main body 1. The main body 1 is used to press the welding strip 5 onto at least some of the weld points on the battery cell 4. The auxiliary component 2 is used to press the welding strip 5 onto the remaining weld points on the battery cell 4 along a first direction X after the welding strip traction device 6 releases the welding strip 5, thereby reducing the risk of the welding strip 5 tipping or bending. The conveying device includes a conveyor belt or other form of conveying mechanism, used to convey the battery cell 4 with the welding strip 5 laid on it and the welding press pressing on its surface together to the welding device. The welding device is used to weld the welding strip 5 onto the battery cell 4 to achieve series connection between the battery cells 4 to form a battery string.

[0084] The specific structure of this welding fixture is described below, such as... Figure 11 As shown, a plurality of first pressing parts 11 are spaced apart along the first direction X of the main body 1, and a plurality of first pressing pins 111 are spaced apart along the second direction Y of the first pressing parts 11. The first direction X and the second direction Y are perpendicular to each other. Specifically, the first direction X can be the width direction of the welding press, and it is also the extension direction of the main grid on the battery cell 4; the second direction Y can be the length direction of the welding press, and it is also perpendicular to the extension direction of the main grid on the battery cell 4.

[0085] When the main body 1 presses the welding strip 5 on the surface of the battery cell 4, the first pressure pins 111 on the same first pressing part 11 are used to press different welding strips 5. Therefore, the number of first pressure pins 111 on the same first pressing part 11 should be greater than or equal to the number of welding strips 5 laid on the battery cell 4. Since the welding strip 5 is connected to the main grid of the battery cell 4 in a one-to-one correspondence, the number of first pressure pins 111 on the same first pressing part 11 should be greater than or equal to the number of main grids on the battery cell 4. When multiple first pressing parts 11 are arranged at intervals along the first direction X, the main body 1 can simultaneously press multiple points of the same welding strip 5 onto the main grid of the battery cell 4, improving the stability of the welding press pressing the welding strip 5, preventing the welding strip 5 from shifting during subsequent transportation, and also increasing the contact area between the welding strip 5 and the main grid of the battery cell 4, thereby improving the welding effect of the welding strip 5 and the welding points on the main grid.

[0086] like Figure 11 and Figure 12 As shown, the auxiliary component 2 is movably installed at one end of the main body 1 along the first direction X. The auxiliary component 2 can move closer to or further away from the main body 1 along the first direction X. The auxiliary component 2 is provided with a second pressing part 21. Along the second direction Y, a plurality of second pressing pins 211 are spaced apart on the second pressing part 21. After the welding strip traction device 6 releases the end of the welding strip 5, the auxiliary component 2 can move away from the main body 1 along the first direction X to press the part of the welding strip 5 that was originally clamped by the welding strip traction device 6 onto the battery cell 4, reducing the risk of this part of the welding strip 5 lifting or bending, thereby helping to reduce the risk of incomplete welding, missing welding, or exposed white areas when this part of the welding strip 5 is welded to the battery cell 4.

[0087] The number of second pressing parts 21 can be one or more, and the multiple second pressing parts 21 can be arranged at intervals along the first direction X. This embodiment does not limit this. Each second pressing part 21 includes multiple second pressing pins 211, which are used to press different solder strips 5 respectively. The number of second pressing pins 211 on the same second pressing part 21 should be greater than or equal to the number of solder strips 5 laid on the battery cell 4. Since the solder strips 5 are connected to the main grids of the battery cell 4 in a one-to-one correspondence, the number of second pressing pins 211 on the same second pressing part 21 should be greater than or equal to the number of main grids on the battery cell 4.

[0088] The welding fixture provided in this application embodiment, by setting the welding fixture into two movable connected parts, can press the end of the welding strip 5 originally held by the welding strip traction device 6 onto the solar cell 4 after the welding strip traction device 6 releases the welding strip 5. This not only improves the welding quality of the solar cell string, but also increases the effective connection length between the welding strip 5 and the main grid of the solar cell 4, thereby helping to improve the power generation efficiency of the photovoltaic module.

[0089] Furthermore, existing welding fixtures are all designed to avoid the welding strip traction device 6, and therefore cannot press down the end of the welding strip 5 held by the welding strip traction device 6. Correspondingly, the welding points on the solar cell 4 are all located in positions that the welding fixture can cover, meaning that the welding point positions on the solar cell 4 also avoid the welding strip traction device 6 to ensure that the welding strip 5 can be accurately connected to the welding points on the solar cell 4. However, this structure of the solar cell 4 results in a short effective connection length between the welding strip 5 and the solar cell 4, leading to a low power generation efficiency of the photovoltaic module. The auxiliary component 2 of the welding fixture provided in this application can press the welding strip 5 onto the solar cell 4 after the welding strip traction device 6 releases it. Therefore, welding points can also be set on the part of the solar cell 4 that was originally covered by the welding strip traction device 6 (i.e., the part covered by the auxiliary component 2) to connect with the welding strip 5 that was originally held by the welding strip traction device 6, increasing the effective connection length between the welding strip 5 and the main grid of the solar cell 4, thereby increasing the current collection capability of the welding strip 5 at the edge of the solar cell 4, and thus improving the power generation efficiency of the photovoltaic module. Therefore, using the welding fixture provided in this embodiment helps to move the end weld points of the battery cell 4 outward. The welding fixture and the welding equipment including the welding fixture can be applied to battery cells 4 with various structures and sizes, and does not limit the structure of the end weld points of the battery cell 4. The end weld points of the battery cell 4 can be a harpoon structure or a straight structure, both of which can be adapted to the welding fixture.

[0090] In one specific embodiment, the auxiliary component 2 can be connected to the main body 1 via a telescopic rod or other telescopic structure. After the welding strip traction device 6 releases the end of the welding strip 5, the telescopic structure can be manually or automatically pulled by a robotic arm to move the auxiliary component 2 away from the main body 1 along the first direction X.

[0091] Or, such as Figure 11 and Figure 12 As shown, the auxiliary component 2 can be elastically connected to the main body 1 via the elastic component 3 or other structures. When the welding fixture is placed on the welding strip 5 by the fixture gripping device, the elastic component 3 is in a position where... Figure 11 In the compressed state shown, the auxiliary component 2 is close to the main body 1, and the end of the auxiliary component 2 away from the main body 1 along the second direction X abuts against the welding strip traction device 6. When the welding strip traction device 6 releases the welding strip 5, the auxiliary component 2 can be ejected along the first direction X away from the main body 1 under the restoring force of the elastic component 3, so that the second pressing part 21 can press the part of the welding strip 5 originally held by the welding strip traction device 6 onto the battery cell 4. The elastic component 3 can be a compression spring, torsion spring or other elastic structure, and this embodiment does not limit it.

[0092] By setting the elastic element 3 to elastically connect the main body 1 and the auxiliary element 2, the auxiliary element 2 can be automatically released, simplifying the structure of the welding press, saving parts, and making it more convenient to use. Furthermore, for welding equipment, using the welding press provided in this embodiment does not require modifications to existing welding equipment, nor does it require an additional robotic arm to move the auxiliary element 2, thus saving on photovoltaic module manufacturing costs and improving photovoltaic module manufacturing efficiency.

[0093] In the above structure, to prevent the restoring force of the elastic element 3 from acting on the main body 1 and causing the main body 1 to shift, a first magnetic suction element can be provided at the bottom of the main body 1. Specifically, the first magnetic suction element can be provided all over the bottom of the main body 1, or it can be provided at the bottom of both ends of the main body 1 along the second direction X (i.e., the parts where the first pressure pin 111 is not provided). Correspondingly, a structure that magnetically engages with the first magnetic suction element needs to be provided at the corresponding position of the conveyor belt in the conveying device, so that the main body 1 can move synchronously with the conveyor belt, preventing the main body 1 from shifting under the action of the elastic element 3, and also enabling the main body 1 to more stably press the welding strip 5, preventing the main body 1 from shifting during the conveying process. More specifically, the first magnetic suction element can be a magnet or other magnetic structure, or the entire main body 1 can be made of magnetic material, while the magnetic structure on the conveyor belt can be a magnet or sheet metal.

[0094] In order to ensure that the auxiliary component 2 can be smoothly ejected in the first direction X away from the main body 1 under the action of the elastic component 3, the auxiliary component 2 should not be provided with any magnetic structure, and the auxiliary component 2 should not be made of magnetic material.

[0095] In one specific implementation, such as Figure 8 and Figure 9 As shown, the first pressure needle 111 is retractably connected to the first pressing part 11, and / or the second pressure needle 211 is retractably connected to the second pressing part 21.

[0096] like Figure 8As shown, the first pressing needle 111 includes a first limiting part 111a, a first body part 111b, and a first pressing needle part 111c. The first body part 111b is movably inserted into the first pressing part 11. The diameter of the first limiting part 111a is larger than that of the first body part 111b and is located on the upper surface of the first pressing part 11. It is used to form a limiting fit with the upper surface of the first pressing part 11 to prevent the first pressing needle 111 from coming out of the first pressing part 11. The diameter of the first pressing needle part 111c is larger than that of the first body part 111b and is located at the end of the first body part 111b away from the first limiting part 111a. It is used to abut against the solder ribbon 5 to press the solder ribbon 5 onto the surface of the battery cell 4. Specifically, a first spring 112 is sleeved on the first body part 111b. The two ends of the first spring 112 abut against the lower surface of the first pressing part 11 and the first pressing needle part 111c, respectively, so that an elastic connection structure is formed between the first pressing needle 111 and the first pressing part 11. The first pressing needle 111 is equivalent to a spring pressing needle. The first pressing needle 111 can extend or retract relative to the first pressing part 11. At this time, by adjusting the compression amount of the first spring 112, the pressure applied by the first pressing needle 111 to the welding strip 5 can be changed, ensuring that the first pressing needle 111 can press the welding strip 5 tightly, so that the welding strip 5 and the battery cell 4 can fully contact each other, effectively avoiding poor welding, and also improving the flexibility of the first pressing needle 111 and the welding strip 5.

[0097] like Figure 9 As shown, the second pressure needle 211 includes a second limiting part 211a, a second body part 211b, and a second pressure needle part 211c. The second body part 211b is movably inserted into the second pressing part 21. The diameter of the second limiting part 211a is larger than that of the second body part 211b, and it is located on the upper surface of the second pressing part 21. It is used to form a limiting fit with the upper surface of the second pressing part 21 to prevent the second pressure needle 211 from coming out of the second pressing part 21. The diameter of the second pressure needle part 211c is larger than that of the second body part 211b, and it is located at the end of the second body part 211b away from the second limiting part 211a. It is used to abut against the solder ribbon 5 to press the solder ribbon 5 onto the surface of the battery cell 4. Specifically, a second spring 212 is sleeved on the second body part 211b. The two ends of the second spring 212 abut against the lower surface of the second pressing part 21 and the second pressing needle part 211c, respectively, so that an elastic connection structure is formed between the second pressing needle 211 and the second pressing part 21. The second pressing needle 211 is equivalent to a spring pressing needle. The second pressing needle 211 can extend or retract relative to the second pressing part 21. At this time, by adjusting the compression of the second spring 212, the pressure applied by the second pressing needle 211 to the welding strip 5 can be changed, ensuring that the second pressing needle 211 can press the welding strip 5 tightly, so that the welding strip 5 and the battery cell 4 can fully contact each other, effectively avoiding poor welding, and also improving the flexibility of the cooperation between the second pressing needle 211 and the welding strip 5.

[0098] In summary, at least one of the first pressure pin 111 and the second pressure pin 211 can adopt the above-described structure to form a spring pressure pin, thereby improving the clamping effect of the welding fixture on the solder strip 5. When both the first pressure pin 111 and the second pressure pin 211 adopt the above-described structure to form spring pressure pins, the clamping effect of the welding fixture on the solder strip 5 can be significantly improved, which is beneficial to improving the connection effect between the solder strip 5 and the solar cell 4, and thus beneficial to improving the power generation efficiency of the photovoltaic module.

[0099] When the welding equipment uses the welding press described in the above embodiments, the specific steps of the welding process are as follows: The cell gripping device first places a cell 4 face up on the conveyor belt of the conveyor device; the welding strip traction device 6 lays the welding strip 5 along the first direction X from one end of the cell 4 to the other end, and then the welding strip traction device 6 clamps one end of the welding strip 5 and lowers it as a whole to the end of the cell 4; the press gripping device grips the welding press in a compressed state and places the welding press on the part of the cell 4 that is not covered by the welding strip traction device 6. The welding strip 5 is pressed tightly against the front of the battery cell. At this time, the auxiliary part 2 abuts against the welding strip traction device 6 on the side away from the main body 1 along the first direction X (as shown in Figure 13(a)). The welding strip traction device 6 releases the welding strip 5 and moves away from the top of the battery cell 4. The auxiliary part 2 can be ejected along the first direction X away from the main body 1 under the restoring force of the elastic member 3, so that the second pressing part 21 presses the group of welding strips 5 originally held by the welding strip traction device 6 against the end of the first battery cell 4 (as shown in Figure 13(b)). According to the above steps, a welding press is placed above each battery cell 4, and the required number of battery cells 4 and their welding strips 5 for a battery string are arranged on the conveying device and finally sent into the welding device for welding by the conveying device.

[0100] Specifically, the welding device can use an infrared light source as a heat source to irradiate and heat the solder ribbon 5 and the battery cell 4 through the hollow area in the welding fixture (the gap between two adjacent first clamping parts 11, and the gap between the first clamping part 11 and the second clamping part 21), causing the solder on the solder ribbon 5 to melt and thus weld it to the solder joint on the main grid of the battery cell 4. The main body 1, the auxiliary component 2, and its pressure pins can all be made of light-transmitting or heat-conducting materials to reduce the absorption of heat from the heat source, thereby transferring more heat to the solder ribbon 5 and the battery cell 4.

[0101] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A welding press, characterized in that, include: The main body (1) is provided with a plurality of first pressing parts (11) at intervals along the first direction, and a plurality of first pressing needles (111) are provided at intervals along the second direction. The auxiliary component (2) is provided with a second pressing part (21) and a third pressing part at both ends along the first direction. Along the second direction, a plurality of second pressing pins (211) are spaced apart on the second pressing part (21), and a plurality of third pressing pins (221) are spaced apart on the third pressing part (22). The second pressing pins (211) and the third pressing pins (221) are respectively used to press the welding strips (5) on two adjacent battery cells (4). The auxiliary component (2) is provided with a receiving space (23) for accommodating the main body (1) so that the auxiliary component (2) can fit onto the outside of the main body (1); The first direction and the second direction are perpendicular to each other.

2. The welding press according to claim 1, characterized in that, The bottom of the main body (1) is provided with a first magnetic suction element; And / or, the bottom of the auxiliary component (2) is provided with a second magnetic attraction component.

3. The welding press according to claim 1, characterized in that, The first pressure needle (111) is telescopically connected to the first pressing part (11). And / or, the second pressure needle (211) is telescopically connected to the second pressing part (21). And / or, the third pressure pin (221) is retractably connected to the third pressing part (22).

4. A welding device, characterized in that, include: A welding device for welding the welding strip (5) onto the battery cell (4); A conveying device for conveying the battery cell (4) and the welding strip (5) to the welding device; A battery cell gripping device is used to place the battery cell (4) onto the conveying device; A welding strip traction device (6) is used to lay the welding strip (5) on the surface of the battery cell (4); A welding press is used to press the welding strip (5) onto the welding point on the surface of the battery cell (4). The welding press includes a main body (1) and an auxiliary part (2) that fits into the main body (1). Along the first direction, the two ends of the auxiliary part (2) are respectively provided with a second pressing part (21) and a third pressing part. Along the second direction, a plurality of second pressing pins (211) are spaced apart on the second pressing part (21), and a plurality of third pressing pins (221) are spaced apart on the third pressing part (22). The clamping device is used to place the main body (1) on the welding strip (5) so that the welding strip (5) is pressed tightly against at least a portion of the welding points on the battery cell (4); the clamping device is also used to fit the auxiliary part (2) onto the outside of the main body (1) after the welding strip traction device (6) releases the welding strip (5), so that the second pressure pin (211) and the third pressure pin (221) of the same auxiliary part (2) respectively press the welding strip (5) on two adjacent battery cells (4) with the remaining welding points on the corresponding battery cells (4); The first direction and the second direction are perpendicular to each other.

5. A welding press, characterized in that, include: The main body (1) is provided with a plurality of first pressing parts (11) at intervals along the first direction, and a plurality of first pressing needles (111) are provided at intervals along the second direction. The auxiliary component (2) is elastically connected to one end of the main body (1) along the first direction by the elastic component (3). The auxiliary component (2) can move closer to or away from the main body (1) along the first direction. The auxiliary component (2) is provided with a second pressing part (21). Along the second direction, a plurality of second pressing pins (211) are spaced apart on the second pressing part (21). The first direction and the second direction are perpendicular to each other.

6. The welding press according to claim 5, characterized in that, The bottom of the main body (1) is provided with a first magnetic suction element.

7. The welding press according to claim 5, characterized in that, The first pressure needle (111) is telescopically connected to the first pressing part (11). And / or, the second pressure needle (211) is telescopically connected to the second pressing part (21).

8. A welding device, characterized in that, include: A welding device for welding the welding strip (5) onto the battery cell (4); A conveying device for conveying the battery cell (4) and the welding strip (5) to the welding device; A battery cell gripping device is used to place the battery cell (4) onto the conveying device; A welding strip traction device (6) is used to lay the welding strip (5) on the surface of the battery cell (4); A welding press is used to press the welding strip (5) onto the welding point on the surface of the battery cell (4). The welding press includes a main body (1) and an auxiliary component (2). The auxiliary component (2) is elastically connected to the main body (1) through an elastic component (3). A pressure gripping device is used to place the welding pressure gripper on the welding strip (5); The main body (1) is used to press the welding strip (5) and at least some of the welding points on the battery cell (4) together, and the auxiliary part (2) is used to move away from the main body (1) in a first direction after the welding strip traction device (6) releases the welding strip (5) so as to press the welding strip (5) and the remaining welding points on the battery cell (4) together.

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