Battery piece anti-bending mechanism
By utilizing a cell inversion mechanism with a flow channel system and Bernoulli's principle, the problem of cell warping after welding was solved, achieving improved plastic deformation and heat dissipation efficiency of the cells, thereby enhancing the reliability and yield of photovoltaic modules.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-03-06
AI Technical Summary
In photovoltaic modules, the cells are prone to warping after being welded to the solder strip, which leads to a decrease in reliability and yield. Existing inversion shaping methods pose a risk of breakage or cell fragmentation.
The solar cell inversion mechanism utilizes the flow channel system formed by the lower and upper covers of the cavity to introduce compressed fluid through Bernoulli's principle, causing the solar cell to undergo plastic deformation on the surface of the lower cover and accelerating heat dissipation, thereby reducing warpage.
It effectively reduces the warpage of solar cells after welding, improves the yield and heat dissipation efficiency of photovoltaic modules, and avoids cell breakage or fragmentation.
Smart Images
Figure CN223978617U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic module technology, and in particular to a cell inversion mechanism. Background Technology
[0002] Currently, photovoltaic modules are typically manufactured by welding solder strips to multiple solar cells and connecting the cells in series. The solder strips are usually made of tin-plated copper, while the solar cells are silicon wafers. Welding methods often employ infrared heating. However, due to the different coefficients of thermal expansion and thermal conductivity of the tin-plated copper and silicon wafers, warping can easily occur after the solar cells are welded to the solder strips. During lamination, the warped surface of the solar cells can puncture the encapsulant film, leading to a decrease in the reliability and yield of the photovoltaic modules.
[0003] To address the warpage issue, researchers in the field have proposed the idea of reverse bending during material preparation. This involves increasing the plastic deformation of the silicon wafer, causing permanent stretching of the silicon substrate. Ideally, the internal stress of the wafer decreases after plastic deformation, eliminating warpage and ensuring the welded wafer remains flat. Reverse bending can be seen as a compensation method. However, in practice, even after welding large-size silicon wafers and then performing reverse bending, the wafers still exhibit significant warpage. Increasing the reverse bending size may lead to wafer breakage, microcracks, or other defects, affecting the reliability of the photovoltaic module.
[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content
[0005] This application provides a cell recurving mechanism, which can at least reduce the warpage of the cell after welding and improve the yield of photovoltaic modules after cell welding.
[0006] As one aspect of the embodiments of this application, this application provides a battery cell recurving mechanism, including:
[0007] The cavity lower cover is used to adsorb the battery cell, and the surface of the cavity lower cover facing the battery cell is provided with a protruding pusher.
[0008] The cavity top cover is located on the side of the cavity bottom cover away from the battery cell;
[0009] The lower cavity cover and the upper cavity cover form a cavity for fluid flow.
[0010] The cavity includes a first flow channel and a second flow channel that are interconnected. One of the first flow channel and the second flow channel is located between the lower cover of the cavity and the battery cell, and the other is located between the lower cover of the cavity and the upper cover of the cavity.
[0011] Optionally, it also includes an abutting portion for abutting the battery cell, and the cavity lower cover is circumferentially disposed on the abutting portion.
[0012] Optionally, the abutting portion is provided with an abutting surface, and the abutting surface and the surface of the lower cover of the cavity facing the battery cell are located on the same plane.
[0013] Optionally, the cross-section of the cavity lower cover near the junction of the first flow channel and the second flow channel is configured as a slope or an arc surface;
[0014] The direction from the upper cover of the cavity to the lower cover of the cavity is defined as the first direction, and the through direction of the first flow channel is defined as the second direction. The projected length of the inclined surface or arc surface along the first direction is greater than its projected length along the second direction.
[0015] Optionally, there are multiple first flow channels and multiple second flow channels, with each first flow channel corresponding to one of the second flow channels.
[0016] Optionally, a plurality of the first flow channels are uniformly arrayed in the horizontal direction; or
[0017] Multiple first flow channels are uniformly arranged around the axis of the lower cover of the cavity.
[0018] Optionally, a plurality of the second flow channels are uniformly arrayed in the horizontal direction; or
[0019] Multiple second flow channels are uniformly arrayed around the axis of the lower cavity cover.
[0020] Optionally, it also includes a connecting part for connecting the drive mechanism;
[0021] The connecting part and the lower cover of the cavity are respectively located on both sides of the upper cover of the cavity.
[0022] Optionally, the pusher is made of a soft material.
[0023] Optionally, the cavity cover and the abutment portion are integrally formed.
[0024] The embodiments of this application employing the above-mentioned technical solution may include the following advantages: When the battery cell inversion mechanism of this utility model picks up the welded battery cell, compressed fluid is introduced into the first or second flow channel. Based on Bernoulli's principle, the fluid velocity in the flow channel located on the side of the cavity cover facing the battery cell increases and the pressure decreases. Under the action of air pressure, the battery cell is pressed tightly against the surface of the cavity cover. The pusher hinders the battery cell from moving towards the cavity cover. That is, the force direction of the part of the battery cell abutting the cavity cover is opposite to the force direction of the part of the battery cell abutting the pusher, thereby causing the battery cell to undergo plastic deformation. At the same time, the accelerated fluid can also carry away the heat from the surface of the welded battery cell, improving the heat dissipation efficiency. Attached Figure Description
[0025] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.
[0026] Figure 1 This is a schematic diagram of the planar structure of the battery cell inversion mechanism provided in the embodiments of this application;
[0027] Figure 2 yes Figure 1 A bottom view;
[0028] Figure 3 It's the air. Figure 1 A schematic diagram of the flow path within the first and second flow paths of the solar cell inversion mechanism.
[0029] Explanation of reference numerals in the attached figures:
[0030] 1-Connecting part; 2-Upper cover of cavity; 3-Lower cover of cavity; 31-Sloping surface; 4-First flow channel; 5-Cavity; 6-Second flow channel; 7-Abutting part; 8-Pushing part;
[0031] 100-cell battery. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.
[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0034] In this application, when numerical intervals (i.e., numerical ranges) are involved, unless otherwise specified, the distribution of selectable numerical values within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.
[0035] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.
[0036] Please refer to the following: Figure 1 and Figure 2 This utility model discloses a battery cell recurving mechanism, including a cavity upper cover 2 and a cavity lower cover 3, wherein the cavity lower cover 3 and the cavity upper cover 2 form a cavity 5 for fluid flow, the cavity 5 includes a first flow channel 4 and a second flow channel 6 that are interconnected, the cavity lower cover 3 is used to adsorb the battery cell 100, and the surface of the cavity lower cover 3 facing the battery cell 100 is provided with a protruding pusher 8; one of the first flow channel 4 and the second flow channel 6 is provided on the surface of the cavity lower cover 3 facing the battery cell 100, and the other is provided between the cavity upper cover 2 and the cavity lower cover 3. As can be seen, when the battery cell recurving mechanism of this utility model picks up the welded battery cell 100, compressed fluid is introduced into the first flow channel 4 or the second flow channel 6. Based on Bernoulli's principle, the fluid velocity in the flow channel located on the side of the cavity lower cover 3 facing the battery cell 100 increases and the pressure decreases. Under the action of external air pressure, the battery cell 100 is pressed tightly onto the surface of the cavity lower cover 3. The pusher 8 prevents the battery cell 100 from moving toward the cavity lower cover 3, thereby causing the battery cell 100 to bend. At the same time, the accelerated fluid can also carry away the heat from the surface of the welded battery cell 100, improving the heat dissipation efficiency.
[0037] Specifically, such as Figure 1As shown, the flow channel between the upper cavity cover 2 and the lower cavity cover 3 is defined as the first flow channel 4, and the flow channel on the outer surface (i.e., the side facing the battery cell 100) of the lower cavity cover 3 is defined as the second flow channel 6. The cross-section of the lower cavity cover 3 near the junction of the first flow channel 4 and the second flow channel 6, along the direction from the upper cavity cover 2 to the lower cavity cover 3, is configured as a slope 31 or an arc surface to reduce the ratio of mechanical energy to heat energy when the fluid rubs against this junction. More specifically, the direction from the upper cavity cover 2 to the lower cavity cover 3 is defined as the first direction, and the first flow channel 4 is defined in… Figure 1 The direction of penetration shown inside is the second direction; in short, Figure 1 The vertical direction is the first direction, and the horizontal direction is the second direction. The first direction is perpendicular to the second direction. The projected length of the inclined surface 31 or arc surface formed at the connection between the first flow channel 4 and the second flow channel 6 along the first direction is greater than its projected length along the second direction.
[0038] In an optional embodiment, the battery cell recurving mechanism further includes an abutment portion 7, which is used to abut the battery cell 100, such as... Figure 1 As shown, the lower cavity cover 3 is circumferentially disposed around the abutment portion 7, and in this cross-sectional view, the lower cavity cover 3 is symmetrical about the central axis of the abutment portion 7 along the first direction. Figure 1 Taking the part of the structure located on the left side of the abutment 7 in the second direction as an example, the inclined surface 31 formed at the connection between the first flow channel 4 and the second flow channel 6 is inclined from the lower left to the upper right and is not connected to the abutment 7. With this configuration, the abutment 7 can limit the surface height of the middle region of the battery cell 100, and the abutment 7 also serves as part of the cavity 5. Under the combined action of the inclined surface 31 and the abutment 7, the fluid in each flow channel is ensured to flow in an orderly manner along a predetermined route. Preferably, the surface of the abutment 7 used to abut the battery cell 100 and the surface of the cavity cover 3 used to adsorb the battery cell 100 are located on the same plane to prevent irregular bending of the surface of the battery cell 100 when the battery cell bending mechanism picks up the battery cell 100.
[0039] Furthermore, the number of first flow channels 4 and the number of second flow channels 6 are configured to be the same and correspond one to one. In an optional embodiment, the number of first flow channels 4 and the number of second flow channels 6 can each be configured to have one. However, considering the uniformity of suction, it is better to configure multiple first flow channels 4 and second flow channels 6. Such variations all fall within the protection scope of this utility model.
[0040] Optionally, the surface of the cavity lower cover 3 used to adsorb the battery cell 100 is defined as a horizontal plane, with its extension direction being horizontal. Multiple first flow channels 4 are uniformly arrayed along the horizontal direction, and multiple second flow channels 6 are also uniformly arrayed along the horizontal direction; or multiple first flow channels 4 are uniformly arrayed around the axis of the cavity lower cover 3, and multiple second flow channels 6 are also uniformly arrayed around the axis of the cavity lower cover 3, such as... Figure 2As shown, in this embodiment, multiple first flow channels 4 are arranged in a circumferential array around the axis of the lower cover 3 of the cavity, and multiple second flow channels 6 are also arranged in a circumferential array around the axis of the lower cover 3 of the cavity to ensure uniform suction in all directions.
[0041] Preferably, in this embodiment, the cavity cover 2 and the abutment portion 7 are integrally molded to ensure good airtightness of the cavity 5, allowing fluid to flow only inside the cavity 5. More specifically, in this embodiment, the cavity 5 can be connected to the external atmosphere, i.e., the fluid is air. Figure 3 As shown, the air in the first flow channel 4 flows in the direction of the arrow in the second direction. After applying force to the upper cover 2 of the cavity in the vertically downward direction in the first direction, the upper cover 2 of the cavity moves towards the lower cover 3 of the cavity. The pressure is converted into the thrust of the air movement. The air in the first flow channel 4 accelerates into the second flow channel 6. Based on Bernoulli's principle, the fluid velocity in the second flow channel 6 increases and the pressure decreases. A low-pressure region is formed between the battery cell 100 and the lower cover 3 of the cavity. The atmospheric pressure on the battery cell 100 is defined as F1. Under the action of 1, the battery cell 100 is pressed against the surface of the cavity lower cover 3. Since the pusher 8 protrudes from the surface of the cavity lower cover 3, it can prevent the battery cell 100 from moving toward the cavity lower cover 3. The reaction force of the pusher 8 on the battery cell 100 is defined as F2. Under the combined action of atmospheric pressure F1 and the pressure F2 of the pusher 8, the part of the battery cell 100 near the pusher 8 undergoes plastic deformation. At the same time, the accelerated fluid in the second flow channel 6 can also carry away the heat on the surface of the battery cell 100 after welding, thus improving the heat dissipation efficiency.
[0042] It is understood that the cell recurving mechanism in this embodiment can not only rely on the upper cover 2 of the cavity to apply force, but can also be connected to compressed air at the first flow channel 4. The cross-sectional length of the first flow channel 4 along the first direction is greater than the cross-sectional length of the second flow channel 6 along the first direction. When the compressed air flows through the inclined surface 31 or arc surface of the lower cover 3 of the cavity and enters the second flow channel 6, the cross-sectional area of the flow channel decreases. Based on Bernoulli's principle, the compressed air velocity increases at this time. Under the action of atmospheric pressure F1, the cell 100 is pressed tightly against the surface of the lower cover 3 of the cavity. In some embodiments, the second... Compressed air is connected to the flow channel 6 and discharged from the first flow channel 4. At this time, it is not necessary to consider the cross-sectional length relationship between the first flow channel 4 and the second flow channel 6 in the first direction. It is only necessary to ensure that the compressed air in the second flow channel 6 is fast enough to form a pressure difference with the external atmosphere on the side of the battery cell 100 away from the contact part 7. Based on Bernoulli's principle, under the action of atmospheric pressure F1, the battery cell 100 is pressed tightly onto the surface of the cavity lower cover 3. The pressure adsorption process is similar to the adsorption process described above. The details will not be elaborated further. This transformation method also falls within the protection scope of this utility model.
[0043] Preferably, the battery cell recurving mechanism of this embodiment further includes a connecting part 1 for connecting the driving mechanism. The connecting part 1 and the lower cavity cover 3 are respectively disposed on both sides of the upper cavity cover 2, that is, the connecting part 1 is disposed away from the lower cavity cover 3.
[0044] Preferably, the pusher 8 is made of a soft material. In this embodiment, the pusher 8 is configured as a rubber strip. Based on the properties of rubber itself, it can prevent obvious creases from appearing during the bending process of the battery cell 100 and ensure good flatness of the surface of the battery cell 100.
[0045] In summary, the present invention provides a battery cell recurving mechanism, comprising an upper cavity cover 2 and a lower cavity cover 3, wherein the lower cavity cover 3 and the upper cavity cover 2 form a cavity 5 for fluid flow, the cavity 5 including a first flow channel 4 and a second flow channel 6 that are interconnected, the lower cavity cover 3 is used to adsorb the battery cell 100, and the surface of the lower cavity cover 3 facing the battery cell 100 is provided with a protruding pusher 8; one of the first flow channel 4 and the second flow channel 6 is located on the surface of the lower cavity cover 3 facing the battery cell 100, and the other is located between the upper cavity cover 2 and the lower cavity cover 3. As can be seen, when the battery cell recurving mechanism of this utility model picks up the welded battery cell 100, compressed fluid is introduced into the first flow channel 4 or the second flow channel 6. Based on Bernoulli's principle, the fluid velocity in the flow channel located on the side of the cavity lower cover 3 facing the battery cell 100 increases and the pressure decreases. Under the action of external air pressure, the battery cell 100 is pressed tightly onto the surface of the cavity lower cover 3. The pusher 8 prevents the battery cell 100 from moving toward the cavity lower cover 3, thereby causing the battery cell 100 to bend. At the same time, the accelerated fluid can also carry away the heat from the surface of the welded battery cell 100, improving the heat dissipation efficiency.
[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0047] For ease of description, directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" generally indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the purpose of facilitating the description of this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the referred mechanism or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the components themselves. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.
[0048] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a communication 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 application according to the specific circumstances.
[0049] Unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0051] It should also be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.
[0052] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0053] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.
Claims
1. A battery piece reverse bending mechanism, characterized in that, The application relates to a battery piece pushing device, which comprises: a lower cavity cover (3) for adsorbing a battery piece, wherein the surface of the lower cavity cover (3) on the side facing the battery piece is provided with a protruding pushing piece (8); an upper cavity cover (2) located on the side of the lower cavity cover (3) away from the battery piece; wherein the lower cavity cover (3) and the upper cavity cover (2) form a cavity (5) for fluid flow; the cavity (5) comprises a first flow channel (4) and a second flow channel (6) which are in communication with each other, one of the first flow channel (4) and the second flow channel (6) is arranged on the surface of the lower cavity cover (3) on the side facing the battery piece, and the other is arranged between the lower cavity cover (3) and the upper cavity cover (2).
2. The battery piece reverse bending mechanism according to claim 1, wherein The application further comprises an abutting part (7) for abutting the battery piece, and the lower cavity cover (3) is arranged around the abutting part (7).
3. The battery piece reverse bending mechanism according to claim 2, wherein The abutting part (7) is provided with an abutting surface which is in the same plane as the surface of the lower cavity cover (3) on the side facing the battery piece.
4. The cell piece reverse bending mechanism according to claim 1, wherein The cross section of the lower cavity cover (3) near the communication part of the first flow channel (4) and the second flow channel (6) is configured as an inclined plane (31) or an arc surface; the direction of the upper cavity cover (2) pointing to the lower cavity cover (3) is defined as a first direction, the through direction of the first flow channel (4) is defined as a second direction, and the projection length of the inclined plane (31) or the arc surface along the first direction is greater than the projection length along the second direction.
5. The cell piece reverse bending mechanism according to claim 1, wherein The first flow channel (4) is provided with a plurality of first flow channels (4), and the second flow channel (6) is also provided with a plurality of second flow channels (6), and the first flow channel (4) and the second flow channel (6) correspond to each other.
6. The cell piece reverse bending mechanism according to claim 5, wherein The plurality of first flow channels (4) are uniformly arrayed along the horizontal direction; or The plurality of first flow channels (4) are uniformly arrayed around the axis of the lower cavity cover (3).
7. The cell piece reverse bending mechanism according to claim 5, wherein The plurality of second flow channels (6) are uniformly arrayed along the horizontal direction; or The plurality of second flow channels (6) are uniformly arrayed around the axis of the lower cavity cover (3).
8. The cell piece reverse bending mechanism according to claim 1, wherein The application further comprises a connecting part (1) for connecting a driving mechanism; the connecting part (1) and the lower cavity cover (3) are arranged on the two sides of the upper cavity cover (2).
9. The cell turning mechanism of claim 1, wherein, The pushing piece (8) is made of soft material.
10. The cell piece reverse bending mechanism according to claim 2, wherein The upper cavity cover (2) and the abutting part (7) are integrally formed.