Welding bottom plate and welding device of back contact battery

Abstract

The utility model discloses a welding bottom plate and a welding device for a back contact battery, and the welding bottom plate comprises a bearing main body which is provided with at least one bearing curved top surface which is recessed inwards and a plurality of welding strip guide grooves which are recessed inwards from the bearing curved top surface, and the bearing curved top surface is used for bearing a battery piece; the plurality of welding strip guide grooves are used for accommodating welding strips, and the plurality of welding strip guide grooves and main grid lines of the battery piece are arranged in a one-to-one manner; the ejection structures are arranged in the welding strip guide grooves in a one-to-one correspondence mode and used for driving the welding strips to move towards the bearing curved top face and abut against the battery pieces; and the heating structure is used for heating the bearing main body. The bearing curved top surface, the adsorption pressing device and the ejection structure are matched, so that the welding strip and the battery piece are bent towards the side where the battery piece is located during welding, the welding strip can contract after welding cooling, then the battery piece is driven to be bent downwards to recover to the horizontal state, and therefore the problem of battery piece warping caused by cooling after welding is solved.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic component manufacturing, in particular to a welding base plate and a welding device for a back contact battery. Background Art

[0002] As people's requirements for the efficiency of photovoltaic modules continue to increase, back-contact photovoltaic cells have gradually been widely used in various fields because they have no grid lines blocking the front, have higher conversion efficiency and more beautiful appearance.

[0003] Currently, all electrodes of back-contact photovoltaic cells on the market are set on their backs. They are manufactured by placing the back of the cell downward and performing single-sided welding on a horizontal heating platform. The cell and copper soldering tape are both placed in a horizontal plane before and during welding. However, due to the different thermal expansion coefficients of the copper soldering tape and the cell, the copper soldering tape will shrink after welding and cool down, causing the cell to bend downward, which in turn causes the cell to warp. During the subsequent lamination process, this warping makes it difficult to maintain the appropriate spacing between the cells, thereby increasing the risk of cell cracking. At the same time, since the internal cell strings of photovoltaic modules cannot be repaired after lamination, cells that crack after lamination will further reduce the efficiency of the module. Utility Model Content

[0004] The purpose of the present invention is to provide a welding base plate and a welding device for a back-contact battery, so as to solve the problem of serious warping of battery cells in the prior art during the welding process of the back-contact battery.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A welding base plate for a back-contact battery, comprising:

[0007] The supporting body has at least one receiving curved top surface formed inwardly and a plurality of welding ribbon guide grooves formed inwardly from the receiving curved top surface. The receiving curved top surface is used to support the battery cell and cooperates with the adsorption and pressing device to limit the battery cell to a curved structure. The plurality of welding ribbon guide grooves are used to accommodate welding ribbons and are arranged one-to-one with the main grid lines of the battery cell.

[0008] A plurality of ejection structures are arranged in the solder ribbon guide groove in a one-to-one correspondence, and are used to drive the solder ribbon to move toward the receiving curved top surface and abut against the battery cell;

[0009] The heating structure is used to heat the carrier body to weld the welding ribbon to the battery cell.

[0010] In some embodiments, the ejection structure includes an ejector plate and a plurality of ejectors, and the ejector plate drives the plurality of ejectors to move in a height direction under the drive of a driving member;

[0011] One end of the ejector pin is vertically arranged on the ejector plate, and the other end of the ejector pin points to the receiving curved top surface.

[0012] In some embodiments, the top surfaces of several of the ejector pins are curved surfaces, and the curvature of the curved surface is the same as the curvature of the receiving curved top surface.

[0013] In some embodiments, a plurality of the ejector pins are elastically and telescopically arranged on the ejector pin plate.

[0014] In some embodiments, the ejector pin includes a first rod, a second rod sleeved outside the first rod, and a spring located inside the second rod.

[0015] The spring is held between the first rod and the bottom of the second rod, and the spring is always in a compressed state.

[0016] In some embodiments, in the height direction, the orthographic projection of the receiving curved top surface covers the orthographic projection of the corresponding battery cell.

[0017] In some embodiments, the heating structure is a heating wire, a resistance wire, or a lamp.

[0018] The present application also provides a back contact battery welding device, comprising:

[0019] As the welded base plate described above;

[0020] The adsorption and pressing device is located just above the welding bottom plate, and is used to adsorb and carry the battery cell, and move downward in the height direction to cooperate with the receiving curved top surface to limit the battery cell to a curved structure.

[0021] In some embodiments, the adsorption and pressing device includes:

[0022] A fixing frame is arranged across the welding base plate;

[0023] A horizontal movable frame is slidably mounted on the fixed frame and is adapted to move in a horizontal direction under the drive of the driving structure;

[0024] A lifting cylinder is vertically mounted on the horizontal movable frame;

[0025] The nozzle fixing plate is mounted on the lifting cylinder and moves back and forth in the height direction under the drive of the lifting cylinder;

[0026] A plurality of vacuum nozzles are arranged on the nozzle fixing plate;

[0027] A negative pressure generator is connected to the plurality of vacuum suction nozzles.

[0028] In some embodiments, the vacuum nozzle is a soft nozzle.

[0029] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are:

[0030] The welding base plate of the present application is provided with at least one receiving curved top surface formed by an inward concave shape, and the receiving curved top surface cooperates with the adsorption and downward pressure device to limit the battery cell to a curved structure. By providing a welding ribbon guide groove for accommodating the welding ribbon on the supporting body, and driving the welding ribbon to move toward the receiving curved top surface through the ejection structure, and to abut against the battery cell. The receiving curved top surface, the adsorption and downward pressure device and the ejection structure cooperate so that the shape of the welding ribbon and the battery cell during welding is bent toward the side where the battery cell is located. Due to the different thermal expansion coefficients of the welding ribbon and the battery cell, the welding ribbon will shrink after cooling, and then drive the battery cell to bend downward and return to a horizontal state, thereby offsetting the warping problem caused by the different shrinkage of the welding ribbon and the battery cell caused by cooling after welding, and can effectively improve the fragmentation rate of the battery cell, achieve the purpose of improving the production yield, improve practicality, and reduce manufacturing costs.

[0031] In addition, by providing the welding ribbon guide groove, the welding position between the welding ribbon and the battery cell can be limited, thereby improving the welding accuracy and the quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a schematic cross-sectional structural diagram of a welding base plate in one embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1-carrying body; 2-ejection structure; 21-ejector plate; 22-ejector; 3-heating structure; 4-welding ribbon guide groove; 5-supporting curved top surface; 6-battery cell; 7-welding ribbon. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0039] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0040] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] An embodiment of the present application provides a welding device for a back-contact battery, including a welding base plate and an adsorption and pressing device. The welding base plate is used to weld welding strips and battery cells. The adsorption and pressing device is located directly above the welding base plate and is used to adsorb and transport the battery cells, and move downward in the height direction to cooperate with the welding base plate to limit the battery cells to a curved structure.

[0043] In some embodiments, the suction and downward pressure device includes a fixed frame spanning the welding base plate, a horizontally movable frame slidably mounted on the fixed frame, a lifting cylinder vertically mounted on the horizontally movable frame, a nozzle fixing plate mounted on the lifting cylinder, a plurality of vacuum nozzles mounted on the nozzle fixing plate, and a negative pressure generator connected to the plurality of vacuum nozzles. The negative pressure generator can specifically be a negative pressure blower or a vacuum pump, which is a conventional structure.

[0044] Specifically, the horizontal moving frame is adapted to move horizontally under the drive of a driving structure, which may specifically be a motor and a transmission mechanism. The conventional structure will not be described in detail here. The nozzle fixing plate is driven by a lifting cylinder to reciprocate in the height direction to drive the plurality of nozzles to move.

[0045] In some embodiments, the vacuum nozzle is a soft nozzle to prevent scratches on the front of the battery cell. Specifically, the vacuum nozzle can be made of silicone, a conventional material, and will not be described in detail here.

[0046] See Figure 1 The above-mentioned welding base plate includes a bearing body 1, a plurality of ejection structures 2 and a heating structure 3.

[0047] Specifically, the supporting body 1 has at least one receiving curved top surface 5 formed inwardly and a plurality of welding strip guide grooves 4 formed inwardly concavely from the receiving curved top surface 5. The receiving curved top surface 5 is used to support the battery cell 6 and cooperates with the adsorption and pressing device to limit the battery cell 6 to a curved structure. The plurality of welding strip guide grooves 4 are used to accommodate the welding strips 7 and are arranged one-to-one with the main grid lines of the battery cell 6.

[0048] Specifically, in the height direction, the orthographic projection of the receiving curved top surface 5 covers the orthographic projection of the corresponding battery cell 6, so as to ensure that the receiving curved top surface 5 can completely receive the battery cell 6, so that the entire battery cell 6 is evenly heated.

[0049] A plurality of ejection structures 2 are arranged in a one-to-one correspondence within the solder ribbon guide groove 4 to drive the solder ribbon 7 to move toward the receiving curved top surface 5 and abut against the battery cell 6 .

[0050] In some embodiments, the ejection structure 2 includes an ejector plate 21 and a plurality of ejector pins 22. Driven by a driving member, the ejector plate 21 drives the ejector pins 22 to move in the height direction. One end of the ejector pin 22 is vertically mounted on the ejector plate 21, and the other end of the ejector pin 22 points toward the receiving curved top surface 5.

[0051] In detail, the driving member is a lifting cylinder, which is vertically arranged at the bottom of the supporting body 1 , and the piston rod passes through the bottom of the welding strip guide groove 4 to be fixed to the ejector plate 21 .

[0052] In some embodiments, the top surfaces of the plurality of ejector pins 22 are curved surfaces, and the curvature of the curved surface is the same as the curvature of the receiving curved top surface 5 .

[0053] In other embodiments, a plurality of ejector pins 22 are elastically and telescopically arranged on the ejector pin plate 21 .

[0054] In detail, the ejector pin 22 includes a first rod, a second rod sleeved outside the first rod, and a spring located inside the second rod. The spring is held between the bottom of the first rod and the bottom of the second rod, and is always in a compressed state.

[0055] By making the top surfaces of the plurality of ejector pins 22 a curved surface, or by making the plurality of ejector pins 22 elastically extendable and arranged on the ejector plate 21, it is used to adapt to the shape of the bent battery cell 6, ensuring that the welding ribbon 7 and the battery cell 6 can be tightly fitted and the force is evenly applied everywhere.

[0056] The heating structure 3 is used to heat the carrier body 1 to weld the welding ribbon 7 to the battery cell 6 .

[0057] In some embodiments, the heating structure 3 is a heating wire, a resistance wire, or a lamp, which is not specifically limited in this application.

[0058] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are:

[0059] The welding base plate of the present application is provided with at least one receiving curved top surface formed by an inward concave shape, and the receiving curved top surface cooperates with the adsorption and downward pressure device to limit the battery cell to a curved structure. By providing a welding ribbon guide groove for accommodating the welding ribbon on the supporting body, and driving the welding ribbon to move toward the receiving curved top surface through the ejection structure, and to abut against the battery cell. The receiving curved top surface, the adsorption and downward pressure device and the ejection structure cooperate so that the shape of the welding ribbon and the battery cell during welding is bent toward the side where the battery cell is located. Due to the different thermal expansion coefficients of the welding ribbon and the battery cell, the welding ribbon will shrink after cooling, and then drive the battery cell to bend downward and return to a horizontal state, thereby offsetting the warping problem caused by the different shrinkage of the welding ribbon and the battery cell caused by cooling after welding, and can effectively improve the fragmentation rate of the battery cell, achieve the purpose of improving the production yield, improve practicality, and reduce manufacturing costs.

[0060] In addition, by providing the welding ribbon guide groove, the welding position between the welding ribbon and the battery cell can be limited, thereby improving the welding accuracy and the quality of the battery cell.

[0061] Finally, it should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A welding base plate for a back contact battery, characterized in that: include: The supporting body has at least one receiving curved top surface formed inwardly and a plurality of welding ribbon guide grooves formed inwardly from the receiving curved top surface. The receiving curved top surface is used to support the battery cell and cooperates with the adsorption and pressing device to limit the battery cell to a curved structure. The plurality of welding ribbon guide grooves are used to accommodate welding ribbons and are arranged one-to-one with the main grid lines of the battery cell. A plurality of ejection structures are arranged in the solder ribbon guide groove in a one-to-one correspondence, and are used to drive the solder ribbon to move toward the receiving curved top surface and abut against the battery cell; The heating structure is used to heat the carrier body to weld the welding ribbon to the battery cell.

2. A welding base plate for a back contact battery according to claim 1, characterized in that: The ejection structure includes an ejector plate and a plurality of ejectors, and the ejector plate drives the plurality of ejectors to move in the height direction under the drive of the driving member; One end of the ejector pin is vertically arranged on the ejector plate, and the other end of the ejector pin points to the receiving curved top surface.

3. A welding base plate for a back contact battery according to claim 2, characterized in that: The top surfaces of several of the ejector pins are curved surfaces, and the curvature of the curved surface is the same as the curvature of the receiving curved top surface.

4. A welding base plate for a back contact battery according to claim 2, characterized in that: A plurality of ejector pins are elastically and telescopically arranged on the ejector pin plate.

5. A welding base plate for a back contact battery according to claim 4, characterized in that: The ejector pin includes a first rod, a second rod sleeved outside the first rod, and a spring located inside the second rod. The spring is held between the first rod and the bottom of the second rod, and the spring is always in a compressed state.

6. The welding base plate of a back contact battery according to claim 1, characterized in that: In the height direction, the orthographic projection of the receiving curved top surface covers the orthographic projection of the corresponding battery cell.

7. The welding base plate of a back contact battery according to claim 1, characterized in that: The heating structure is a heating wire, a resistance wire or a lamp tube.

8. A welding device for a back contact battery, characterized in that: include: The welded base plate according to any one of claims 1 to 7; The adsorption and pressing device is located just above the welding bottom plate, and is used to adsorb and carry the battery cell, and move downward in the height direction to cooperate with the receiving curved top surface to limit the battery cell to a curved structure.

9. The welding device according to claim 8, wherein: The adsorption and pressing device comprises: A fixing frame is arranged across the welding base plate; A horizontal movable frame is slidably mounted on the fixed frame and is adapted to move in a horizontal direction under the drive of the driving structure; A lifting cylinder is vertically mounted on the horizontal movable frame; The nozzle fixing plate is mounted on the lifting cylinder and moves back and forth in the height direction under the drive of the lifting cylinder; A plurality of vacuum nozzles are arranged on the nozzle fixing plate; A negative pressure generator is connected to the plurality of vacuum suction nozzles.

10. The welding device according to claim 9, wherein: The vacuum suction nozzle is a soft suction nozzle.

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