A 0bb battery welding device and welding apparatus

Abstract

The utility model discloses a kind of 0BB battery welding device and welding equipment, it is related to battery welding technical field.0BB battery welding device includes heating seat, carrying bottom plate, tooling fixture;Carrying bottom plate is horizontally arranged at the upper end of heating seat, and the upper end surface of carrying bottom plate is used to lay battery piece flat;Tooling fixture cover is arranged on carrying bottom plate, and the lower end surface of tooling fixture is provided with the top pressure part corresponding with the welding point on battery piece;0BB battery welding device provided by the utility model can simultaneously heat the interconnection strip near each welding point on battery piece by heating carrying bottom plate using heating seat, so as to make interconnection strip and battery piece fixedly connected together, and the interconnection strip is pressed by top pressure part, which can effectively ensure the connection reliability and consistency between interconnection strip and battery piece.

Description

Technical Field

[0001] This utility model relates to the field of battery welding technology, and in particular to an OBB battery welding device and welding equipment. Background Technology

[0002] OBB (Obstacle-Free) cells are a revolutionary battery technology whose core feature is the elimination of the main grid lines on the front of the cell, a feature common in traditional solar cells. This improvement results in a cleaner cell surface, reducing light obstruction by the grid lines and thus enhancing photoelectric conversion efficiency. For current harvesting, OBB cells use fine grids instead of main grid lines. These fine grids are evenly distributed across the cell surface and are responsible for collecting and conducting photogenerated carriers to the cell edges. Interconnect strips are then directly connected to these grids, forming a current output path and ensuring efficient and stable power transfer to external circuits.

[0003] At present, the industry has mainly explored and applied two mainstream solutions for the laying and welding of interconnect strips for 0BB batteries.

[0004] The first approach involves laying the interconnect strips using a traction mechanism. In this process, the interconnect strips are precisely pulled to a predetermined position above the solar cells, and then infrared lamps are used as a heat source to weld each interconnect strip to the grid line, one cell at a time. However, this approach faces several challenges in practical applications. During the individual cell welding process, the external environmental conditions (such as temperature, humidity, and airflow) and the heat distribution generated during welding vary for each cell. These factors combined cause varying degrees of warping in the cells after welding. Inconsistent warping not only affects the appearance quality of the cells but may also adversely impact subsequent module encapsulation and long-term stability.

[0005] The second approach employs a lateral transport mechanism to achieve precise placement of the interconnect strips. In this approach, the interconnect strips are transported as a whole above the solar cells, and a precise positioning system ensures accurate alignment with the grid. Subsequently, a single-string welding process is used, simultaneously welding the interconnect strips of multiple solar cells. This ensures all cells experience the same thermal history during welding, maintaining consistent warpage after welding. This approach typically uses contact welding technology, characterized by lower temperatures and a smaller heated area. These gentle welding conditions effectively reduce the relative distortion caused by the difference in thermal expansion coefficients between the interconnect strips and the crystalline silicon material during welding, resulting in a lower overall warpage after welding compared to infrared welding. However, the second approach is not without its flaws. In current practical applications, during transport, due to the mechanical action or design defects of the transport mechanism, the interconnect strips sometimes develop an arched distortion. This distortion prevents the interconnect strips from forming effective planar contact with the grid of the solar cell during welding, leading to poor solder joints. Poor solder joints not only reduce the electrical connection reliability of the solar cells but can also become potential failure points for the module during use. Utility Model Content

[0006] In view of this, the purpose of this utility model is to overcome the shortcomings in related technologies. This utility model provides an OBB battery welding device and welding equipment.

[0007] This utility model provides the following technical solution:

[0008] An OBB battery welding device includes a heating base, a transport base plate, and tooling fixtures.

[0009] The transport base plate is horizontally positioned above the heating seat, and its upper surface is used to lay the battery cells flat. The tooling fixture is placed on the transport base plate, and its lower surface has a pressing part corresponding to the welding point on the battery cell. When welding the battery cell to the interconnecting strip, the battery cell is first laid flat on the transport base plate, then the interconnecting strip is laid on the battery cell so that it covers the corresponding welding point. Then, the tooling fixture is placed on the transport base plate so that the pressing part pushes the interconnecting strip into contact with the welding point of the battery cell. Finally, the heating seat is used to heat the transport base plate.

[0010] As a further improvement to the above technical solution, the tooling fixture has a clearance groove corresponding to the battery cell on the end face near the transport base plate, and the top pressing part is located in the clearance groove.

[0011] As a further improvement to the above technical solution, the bottom of the avoidance groove is provided with a top pressure column in the vertical direction, and the end of the top pressure column near the interconnecting strip is used to form a top pressure part.

[0012] As a further improvement to the above technical solution, the diameter of the end face of the top pressure column near the interconnecting strip is larger than the width of the interconnecting strip.

[0013] As a further improvement to the above technical solution, multiple top pressure columns are evenly distributed along a direction perpendicular to the extension direction of the interconnecting strip.

[0014] As a further improvement to the above technical solution, the bottom of the clearance groove is also provided with multiple clamping members, which are used to push the interconnecting strip into contact with the non-welded part of the battery; the clamping members do not extend beyond the end face of the pressing part near the battery cell.

[0015] As a further improvement to the above technical solution, the OBB battery welding device also includes a press, which is placed on the upper end face of the tooling fixture.

[0016] As a further improvement to the above technical solution, the upper end of the heating seat is covered with multiple parallel grid strips.

[0017] As a further improvement to the above technical solution, the heating temperature provided by the heating seat to the transport base plate is α, and the value range of α is: 220℃≤α≤260℃.

[0018] This utility model also provides a welding device, including the OBB battery welding apparatus as described in any one of the above-mentioned methods.

[0019] Compared with related technologies, the beneficial effects of this utility model are:

[0020] The OBB battery welding device provided by this utility model has the following specific process in actual welding operation:

[0021] First, the operator needs to start the heating base to put it into preheating state.

[0022] Next, the solar cells to be welded are laid flat on the transport base plate. As the core component of photovoltaic modules, the surface flatness and placement accuracy of the solar cells directly affect the welding quality. During the laying process, it is necessary to ensure that the solar cells are in close contact with the transport base plate, avoiding air bubbles or gaps, so as to ensure that heat can be evenly transferred to all parts of the solar cells. Then, the interconnect strips are laid on the solar cells, so that the interconnect strips accurately cover the corresponding welding points of the solar cells.

[0023] After the interconnect strips are laid, the fixture is placed on the transport base plate. During placement, it is crucial to ensure a tight fit between the fixture and the transport base plate to prevent shaking or displacement. Simultaneously, the pressure plate on the fixture will contact the welding points of the interconnect strips and battery cells. The pressure plate provides appropriate pressure to ensure close contact between the interconnect strips and battery cells during welding, creating favorable conditions for metallization.

[0024] Finally, the heating pad continues to heat the transport base plate. When the temperature reaches the specified level and is maintained for a certain period of time, the welding points of the solar cells and the interconnecting strips will be linked together through a high-temperature metallization process, thus completing the welding of the solar cells and the interconnecting strips. During this high-temperature metallization process, the metal material at the welding point will melt and resolidify, forming a strong metallurgical bond, ensuring a stable and reliable electrical connection between the solar cells and the interconnecting strips.

[0025] During this welding process, the solar cells are laid flat on the transport base plate. This design ensures that all welding points on the solar cells and the interconnecting strips in contact with them are heated synchronously and uniformly. The heat generated by the heating element is evenly transferred to all parts of the solar cell through the transport base plate, allowing each welding point to undergo a metallization reaction under the same time and temperature conditions. This ensures that the connection process between each welding point and the interconnecting strip is consistent. This consistent connection process guarantees that each welding point maintains the same connection strength with the interconnecting strip, avoiding local welding defects caused by uneven heating, and improving welding quality and the reliability of the photovoltaic module.

[0026] Furthermore, the pressure applied by the top-pressing section effectively ensures a metallized connection between the interconnecting strip and the solar cell during the tight fit process. The appropriate pressure provided by the top-pressing section allows the welding points of the interconnecting strip and the solar cell to adhere tightly, reducing gaps and increasing the contact area. During the high-temperature metallization process, this tight fit promotes the interdiffusion and bonding of metal atoms, further enhancing the connection strength between the welding points and the interconnecting strip. Simultaneously, the top-pressing section prevents the interconnecting strip from shifting or deforming due to thermal expansion during heating, ensuring the accuracy and stability of the welding position.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This diagram shows a view of the OBB battery welding device in one embodiment of the present invention.

[0030] Explanation of key component symbols:

[0031] 100-Heating base; 110-Grate bar; 200-Transfer base plate; 310-Battery cell; 320-Interconnecting bar; 400-Tooling fixture; 410-Allowing groove; 420-Top pressure column; 430-Clamping part; 500-Pressure tool. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] like Figure 1 As shown, an embodiment of this utility model provides an OBB battery welding device, including a heating base 100, a transport base plate 200, and a tooling fixture 400.

[0038] The transport base plate 200 is horizontally positioned above the heating seat 100, and its upper surface is used to lay the battery cell 310 flat. The tooling fixture 400 is placed on the transport base plate 200, and its lower surface is provided with a pressing part corresponding to the welding point on the battery cell 310. When welding the battery cell 310 to the interconnecting strip 320, the battery cell 310 is first laid flat on the transport base plate 200, then the interconnecting strip 320 is laid on the battery cell 310 so that it covers the corresponding welding point of the battery cell 310. Then, the tooling fixture 400 is placed on the transport base plate 200 so that the pressing part pushes the interconnecting strip 320 into contact with the welding point of the battery cell 310. Finally, the heating seat 100 is used to heat the transport base plate 200.

[0039] The OBB battery welding device provided in this embodiment has the following specific process in actual welding operation:

[0040] First, the operator needs to start the heating base 100 to put it into the preheating state.

[0041] Next, the solar cells 310 to be welded are laid flat on the transport base plate 200. As the core component of the photovoltaic module, the surface flatness and placement accuracy of the solar cells 310 directly affect the welding quality. During the laying process, it is necessary to ensure that the solar cells 310 are in close contact with the transport base plate 200 to avoid air bubbles or gaps, so as to ensure that heat can be evenly transferred to all parts of the solar cells 310. Then, the interconnecting strips 320 are laid on the solar cells 310, so that the interconnecting strips 320 precisely cover the corresponding welding points of the solar cells 310.

[0042] After the interconnect strip 320 is laid, the fixture 400 is placed on the transport base plate 200. During the placement process, it is necessary to ensure that the fixture 400 and the transport base plate 200 fit tightly together to avoid shaking or displacement. At the same time, the pressure part on the fixture 400 will contact and engage with the welding points of the interconnect strip 320 and the battery cell 310. The pressure part can provide appropriate pressure to ensure that the interconnect strip 320 and the battery cell 310 maintain close contact during the welding process, creating favorable conditions for metallization connection.

[0043] Finally, the heating base 100 continuously heats the transport base plate 200. Once the temperature reaches the specified level and is maintained for a certain period (specifically, 1.2-3 seconds), the welding points of the battery cell 310 and the interconnecting strip 320 undergo a high-temperature metallization process, thus completing the welding of the battery cell 310 and the interconnecting strip 320. During this high-temperature metallization process, the metal material at the welding point melts and resolidifies, forming a strong metallurgical bond, ensuring a stable and reliable electrical connection between the battery cell 310 and the interconnecting strip 320.

[0044] During this welding process, since the solar cell 310 is laid flat on the transport base plate 200, this design ensures that all welding points of the solar cell 310 and the interconnecting strips 320 in contact with it are heated synchronously and uniformly. The heat generated by the heating seat 100 is evenly transferred to all parts of the solar cell 310 through the transport base plate 200, so that each welding point can undergo a metallization reaction under the same time and temperature conditions, thereby ensuring that the connection process between each welding point and the interconnecting strip 320 is consistent. This consistent connection process ensures that each welding point maintains the same connection strength with the interconnecting strip 320, avoiding local welding defects caused by uneven heating, improving welding quality and the reliability of the photovoltaic module.

[0045] Furthermore, the pressing action of the top pressure portion on the interconnect strip 320 effectively ensures the metallization connection between the interconnect strip 320 and the battery cell 310 during the tight fit process. The appropriate pressure provided by the top pressure portion allows the welding points of the interconnect strip 320 and the battery cell 310 to fit tightly together, reducing the gap between them and increasing the contact area. During the high-temperature metallization process, this tight fit promotes the mutual diffusion and bonding of metal atoms, further improving the connection strength between the welding points and the interconnect strip 320. At the same time, the top pressure portion also prevents the interconnect strip 320 from shifting or deforming due to thermal expansion during heating, ensuring the accuracy and stability of the welding position.

[0046] In some specific embodiments, the tooling fixture 400 has a clearance groove 410 corresponding to the battery cell 310 on its end face near the transport base plate 200. The pressing part is located in the clearance groove 410, so that when the tooling fixture 400 is placed on the transport base plate 200, its lower end face directly presses against the battery cell 310, causing damage to the battery cell 310 and reducing the probability of damage to the battery cell 310 and the interconnecting strip 320.

[0047] In some specific embodiments, the bottom of the clearance groove 410 is provided with a pressing post 420 in the vertical direction. The pressing post 420 near the end of the interconnecting strip 320 forms a pressing part. Specifically, when the pressing post 420 applies pressing force to the interconnecting strip 320, it only presses the position corresponding to the welding point of the battery cell 310. This precise pressing method ensures that the area on the interconnecting strip 320 corresponding to the welding point is in close contact with the welding point of the battery cell 310. Heating is an essential step in the welding process. However, if the heating process is not properly controlled, it may cause the non-welded positions on the interconnecting strip 320 to connect with the battery cell 310, resulting in quality problems such as short circuits, which seriously affect the performance and reliability of the battery. The design of the pressing part in this embodiment effectively avoids this problem. Since the pressing part only presses the position corresponding to the welding point, a certain gap is maintained between the interconnecting strip 320 and the non-welded positions on the battery cell 310. Even when heated, it will not cause misconnection due to thermal expansion or metal melting. This greatly improves the accuracy and quality of welding, ensuring the stable performance and long-term reliability of 0BB batteries.

[0048] In some specific embodiments, the diameter of the end face of the pressure post 420 near the interconnect strip 320 is larger than the width of the interconnect strip 320, in order to ensure the reliability of the connection between the interconnect strip 320 and the welding point when the pressure post 420 pushes the interconnect strip 320 and the welding point of the battery cell 310 to make contact connection.

[0049] In some specific embodiments, multiple top pressure columns 420 are evenly distributed along a direction perpendicular to the extension direction of the interconnect strip 320, so that this embodiment can simultaneously press multiple interconnect strips 320, thereby simultaneously driving multiple interconnect strips 320 to weld and connect with the battery cell 310, improving the processing and production efficiency of OBB batteries.

[0050] In some specific embodiments, the bottom of the clearance groove 410 is further provided with multiple clamping members 430. The clamping members 430 are used to push the interconnecting strip 320 into contact with the non-welded part of the battery. The clamping members 430 do not extend beyond the end face of the tooling fixture 400 near the battery cell 310. Specifically, during the pressing process, when the pressing part applies pressure to the interconnecting strip 320 to achieve contact between the welding point of the interconnecting strip 320 and the battery cell 310, and during the subsequent heating process, the interconnecting strip 320 will be deformed due to various factors. Due to the pressing and heating at the welding point, the part of the interconnecting strip 320 corresponding to the welding point will be tightly bonded to the battery cell 310, but the part of the interconnecting strip 320 that is not involved in welding is prone to warping and deformation due to thermal expansion, stress release, etc. If this deformation is not effectively controlled, it will not only affect the overall flatness and positional accuracy of the interconnecting strip 320, but may also cause the interconnecting strip 320 to make accidental contact with other non-welded parts on other adjacent battery cells 310.

[0051] At this time, by pressing down on the non-welded portion of the interconnect strip 320 using the clamping member 430, the degree of deformation of the interconnect strip 320 can be effectively reduced. The pressure provided by the clamping member 430 can offset part of the force that causes the interconnect strip 320 to deform, keeping the interconnect strip 320 in a relatively stable state during heating. Furthermore, since the clamping member 430 does not extend beyond the end face of the pressing portion near the battery cell 310, it ensures that when the clamping member 430 presses down on the non-welded portion of the interconnect strip 320, this portion of the interconnect strip 320 will not make additional contact with the battery cell 310. In other words, even if the interconnect strip 320 undergoes a certain degree of deformation adjustment under the action of the clamping member 430, it will not make accidental contact welding with the non-welded area on the battery cell 310, thereby fundamentally avoiding quality problems caused by accidental contact welding and ensuring the welding quality of the OBB battery in this embodiment.

[0052] In some specific embodiments, the OBB battery welding apparatus further includes a pressure fixture 500, which is placed on the upper surface of the tooling fixture 400 to ensure that the tooling fixture 400 can reliably contact and engage the interconnect strip 320 and the battery cell 310.

[0053] In some specific embodiments, the upper end of the heating base 100 is provided with multiple parallel grid strips 110. During the welding process of the OBB battery, the heating base 100 plays a crucial role in providing heat to the battery cells 310 on the transport base plate 200. However, if the heating base 100 is in direct contact with the transport base plate 200 over a large area, heat accumulation can easily occur during the heating process. This heat accumulation can cause localized excessively high temperatures in the heating base 100, while other parts remain relatively cool, resulting in uneven heating of the transport base plate 200. This uneven heating will be transferred to the battery cells 310, causing differences in heating temperature at various locations on the battery cells 310. Excessive temperature differences may lead to a series of problems, such as localized overheating of the battery cells 310 causing changes in material properties, uneven melting at the welding points affecting connection strength, etc., ultimately seriously affecting the welding quality and product performance of the OBB battery.

[0054] The parallel grid strips 110 effectively solve the heat accumulation problem. When the heating base 100 starts working, heat is transferred to the transport base plate 200 through the grid strips 110. Because there are gaps between the grid strips 110, air can flow within these gaps, forming good heat dissipation channels. This allows heat to be distributed more evenly on the contact surface between the heating base 100 and the transport base plate 200, avoiding excessive local heat concentration. At the same time, the parallel arrangement of the grid strips 110 also facilitates directional heat conduction, further improving the efficiency and uniformity of heat transfer.

[0055] In this way, the grid strips 110 ensure uniform heating of all positions on the battery cells 310 on the transport base plate 200. Regardless of their position on the transport base plate 200, the battery cells 310 receive relatively consistent heat, allowing them to reach ideal temperatures during welding. This ensures that the metal materials at the welding points melt and fuse fully at a uniform temperature, forming a strong and reliable connection, thereby effectively improving the welding quality of the OBB battery.

[0056] In some specific embodiments, the heating seat 100 provides a heating temperature α to the transport base plate 200, where α ranges from 220℃ to 260℃. From the perspective of ensuring welding effect, this temperature range provides sufficient heat for the welding point between the interconnect strip 320 and the battery cell 310. During the welding process of the OBB battery, the interconnect strip 320 and the battery cell 310 need to be heated to melt the metal material at the welding point, thereby achieving atomic diffusion and bonding to form a strong metallurgical connection. When the heating temperature is in the range of 220℃ to 260℃, the metal at the welding point can reach a suitable melting state. This avoids insufficient melting due to excessively low temperatures, which could lead to insufficient connection strength between the interconnect strip 320 and the battery cell 310, resulting in quality problems such as incomplete welding or detachment; and also avoids excessive melting due to excessively high temperatures, which could cause irregular welding point shapes, metal spatter, and other defects, affecting the aesthetics and electrical performance of the weld.

[0057] Meanwhile, setting this temperature range also takes into full account the problem of edge warping of the solar cell 310. Solar cell 310 is typically composed of multiple layers of thin-film materials of different materials, and the coefficients of thermal expansion of each layer have certain differences. When the heating temperature is too high, the thermal stress between the different layers of the solar cell 310 will increase significantly. Because the edge portion is relatively less constrained, under the action of thermal stress, the edge of the solar cell 310 is prone to warping. Warping not only affects the flatness of the solar cell 310's appearance, but may also lead to increased interlayer gaps during subsequent module encapsulation, reducing the module's sealing and reliability, and may even cause serious problems such as short circuits in the internal circuitry of the solar cell 310. Controlling the heating temperature within the range of 220℃ - 260℃ can effectively control the thermal stress between the layers of the solar cell 310, avoiding edge warping due to excessive temperature, and ensuring the structural integrity and stability of the solar cell 310 during the welding process.

[0058] In summary, setting the heating temperature α provided by the heating base 100 to the transport base plate 200 within the range of 220℃≤α≤260℃ can ensure a good welding effect at the welding point between the interconnecting strip 320 and the battery cell 310, while effectively avoiding the problem of edge warping of the battery cell 310 due to excessive temperature, thus providing a reliable guarantee for high-quality welding of OBB batteries.

[0059] The embodiments of this utility model also provide a welding device, including the OBB battery welding device as described in the above embodiments. The welding device has all the beneficial effects of the OBB battery welding device, which will not be specifically described here.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An OBB battery welding device, characterized in that, include: Heating base (100); A transport base plate (200) is horizontally positioned at the upper end of the heating base (100), and the upper surface of the transport base plate (200) is used to lay the battery cells (310) flat. A tooling fixture (400) is mounted on the transport base plate (200), and the lower end face of the tooling fixture (400) is provided with a pressing part corresponding to the welding point on the battery cell (310); When welding the battery cell (310) and the interconnect strip (320), the battery cell (310) is first laid flat on the transport base plate (200), and then the interconnect strip (320) is laid on the battery cell (310) so that the interconnect strip (320) covers the corresponding welding point of the battery cell (310). Then, the tooling fixture (400) is placed on the transport base plate (200) so that the top pressing part pushes the interconnect strip (320) and the welding point of the battery cell (310) to make contact and fit. Finally, the heating seat (100) is used to heat the transport base plate (200).

2. The OBB battery welding apparatus according to claim 1, characterized in that, The tooling fixture (400) has a clearance groove (410) corresponding to the battery cell (310) on the end face near the transport base plate (200), and the top pressing part is located in the clearance groove (410).

3. The OBB battery welding apparatus according to claim 2, characterized in that, The bottom of the clearance groove (410) is provided with a top pressure column (420) in the vertical direction. The top pressure column (420) is located near the end of the interconnecting strip (320) to form a top pressure part.

4. The OBB battery welding apparatus according to claim 3, characterized in that, The diameter of the end face of the top pressure column (420) near the interconnecting strip (320) is greater than the width of the interconnecting strip (320).

5. The OBB battery welding apparatus according to claim 3, characterized in that, Multiple top pressure columns (420) are evenly distributed along a direction perpendicular to the extension direction of the interconnecting strip (320).

6. The OBB battery welding apparatus according to claim 2, characterized in that, The bottom of the clearance groove (410) is also provided with a plurality of clamping members (430), which are used to push the interconnecting strip (320) to contact and engage with the non-welded part of the battery; the clamping members (430) do not extend beyond the end face of the pressing part near the battery cell (310).

7. The OBB battery welding apparatus according to any one of claims 1 to 6, characterized in that, It also includes a press (500) which is placed on the upper surface of the tooling fixture (400).

8. The OBB battery welding apparatus according to any one of claims 1 to 6, characterized in that, The upper end of the heating seat (100) is covered with a plurality of parallel grid strips (110).

9. The OBB battery welding apparatus according to any one of claims 1 to 6, characterized in that, The heating seat (100) provides a heating temperature of α to the transport base plate (200), and the value range of α is: 220℃≤α≤260℃.

10. A welding device, characterized in that, Includes the OBB battery welding apparatus as described in any one of claims 1 to 9.

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