Pressing device and battery string warping processing method

Abstract

The invention provides a pressing device and a battery string warping processing method, and the pressing device comprises a pedestal, the top of which is provided with a supporting surface; the downward pressing mechanism is arranged above the base in a liftable mode and provided with a downward pressing surface, the downward pressing surface and the supporting surface are both curved surfaces, the downward pressing surface and the supporting surface are matched to form a pressing space, the pressing space is used for containing a battery string, the shapes of the downward pressing surface and the supporting surface are adjustable, and the downward pressing surface is matched with the upper surface of the battery string; the supporting surface is matched with the lower surface of the battery string; and the cooling mechanism is arranged on the downward pressing mechanism and used for cooling the pressing space. By adopting the scheme, the problem that the battery string is uneven or reversely warped due to the lack of more flexible adjustment on different flattening degrees of the battery string in the pressing process of the pressing mechanism in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a pressing device and a method for processing warping of a battery string. Background Art

[0002] Photovoltaic modules usually use welding ribbons to weld multiple cells in series to form a cell string. Due to the different thermal expansion coefficients of the welding ribbons and the cells, there are also differences in thermal conductivity. After the string welding is completed, the cell string is prone to warping after welding with the welding ribbons. In the prior art, the problem of cell string warping is mostly solved by pressing the cell string to flatten and shape it. However, during the pressing process, the pressing mechanism lacks more flexible adjustment for different flattening degrees of the cell string, so that the pressed cell string appears uneven or reversely warped. Summary of the invention

[0003] The present invention provides a pressing device and a method for processing warping of a battery string, so as to solve the problem that the pressing mechanism in the prior art lacks more flexible adjustment for different flattening degrees of the battery string during the pressing process, resulting in unevenness or reverse warping of the battery string.

[0004] In order to solve the above problems, according to one aspect of the present invention, a pressing device is provided, which includes: a base, the top of the base has a supporting surface; a pressing mechanism, which is arranged above the base in a liftable manner, the pressing mechanism has a pressing surface, both the pressing surface and the supporting surface are curved surfaces, the pressing surface and the supporting surface cooperate to form a pressing space, the pressing space is used to place a battery string, the shapes of the pressing surface and the supporting surface are adjustable, the pressing surface is adapted to the upper surface of the battery string, and the supporting surface is adapted to the lower surface of the battery string; a cooling mechanism is arranged on the pressing mechanism, and the cooling mechanism is used to cool the pressing space.

[0005] Furthermore, the pressing mechanism includes: a bracket, which is liftably arranged above the base; a plurality of pressing units, which are arranged side by side on the bracket along the extension direction of the battery string, and each pressing unit is arranged on the bracket in an adjustable upper and lower position, and the bottom surfaces of the plurality of pressing units jointly form a pressing surface, and along the extension direction of the battery string, the curvature of the bottom surface of the pressing unit located in the middle is smaller than the curvature of the bottom surface of the pressing units located at both ends.

[0006] Furthermore, the cooling mechanism includes a plurality of cooling air ducts, and the plurality of cooling air ducts are distributed at intervals along the extension direction of the battery string, and each cooling air duct is connected to the pressing space.

[0007] Furthermore, a plurality of cooling air ducts are symmetrically distributed on the bracket along the midline of the lower pressure surface.

[0008] Furthermore, the cooling air duct is arranged between any two adjacent downward pressure units.

[0009] Furthermore, a closed cooling chamber is formed between the two downward pressure units on both sides of the cooling air duct, and the cooling air duct includes an air inlet channel and an air outlet channel. The air inlet channel and the air outlet channel are distributed in the cooling chamber along the extension direction of the battery string. The air inlet channel and the air outlet channel are respectively connected to the cooling chamber, and the air inlet of the air inlet channel and the air outlet of the air outlet channel are both located on the outside of the cooling chamber.

[0010] Furthermore, the base includes: a base body; a plurality of lifting units, the plurality of lifting units are arranged side by side on the base body along the extension direction of the battery string, each lifting unit is arranged on the base body in an adjustable vertical position, the top surfaces of the plurality of lifting units jointly form a supporting surface, and along the extension direction of the battery string, the curvature of the top surface of the lifting unit located in the middle is smaller than the curvature of the top surface of the lifting units located at both ends.

[0011] Furthermore, the lifting units and the pressing units are arranged in a one-to-one correspondence.

[0012] According to another aspect of the present invention, a method for processing warping of a battery string is provided, the method comprising: placing a battery string after string welding on a support surface; a first stage: pressing the battery string by a pressing mechanism and cooling the battery string by a cooling mechanism, and when the temperature of the battery string reaches a preset range, stopping the pressing and cooling process; a second stage: pressing and cooling the battery string for a second time by a pressing mechanism and a cooling mechanism, and ending the operation when the temperature of the battery string is between 20 and 30°C; wherein BC batteries are selected for the battery string.

[0013] Further, the cooling rate of the first stage is lower than the cooling rate of the second stage.

[0014] By applying the technical solution of the present invention, a support surface is provided on the top of the base, which cooperates with the pressing surface of the pressing mechanism provided above the base to form a pressing space, and the shapes of the support surface and the pressing surface can be adjusted, and the welded battery string is placed in the pressing space. During operation, the welded battery string is first placed on the support surface. At this time, the pressing mechanism descends so that its pressing surface contacts one surface of the battery string, and at the same time, the other surface of the battery string is pressed against the support surface of the base through the pressing action of the pressing mechanism. Because the battery string that has just been welded still has residual heat from welding, it has good plasticity, making the flattening effect of the pressing mechanism more significant. The cooling mechanism is provided on the pressing mechanism to cool and shape the battery string in the pressing space. Since the shapes of the pressing surface and the support surface are adjustable, the curvature shape of the pressing surface and the support surface can be flexibly changed according to the degree of warping of the battery string during the cooling process, thereby avoiding the problem of reverse warping of the battery string caused by excessive bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic structural diagram of a pressing device provided in an embodiment of the present invention is shown.

[0017] The above drawings include the following reference numerals:

[0018] 10. Base;

[0019] 11. Lifting unit;

[0020] 20. Pressing mechanism;

[0021] 21. Pressing unit;

[0022] 31. Cooling air duct;

[0023] 311, air inlet channel;

[0024] 312, air outlet channel;

[0025] 01. Battery string. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, the present invention provides a pressing device, including a base 10, a pressing mechanism 20 and a cooling mechanism. The top of the base 10 has a supporting surface. The pressing mechanism 20 is arranged above the base 10 in a liftable manner. The pressing mechanism 20 has a pressing surface. Both the pressing surface and the supporting surface are curved surfaces. The pressing surface and the supporting surface cooperate to form a pressing space. The pressing space is used to place the battery string 01. The shapes of the pressing surface and the supporting surface are adjustable. The pressing surface is adapted to the upper surface of the battery string 01, and the supporting surface is adapted to the lower surface of the battery string 01. The cooling mechanism is arranged on the pressing mechanism 20, and the cooling mechanism is used to cool the pressing space.

[0028] By applying the technical solution of the present invention, a supporting surface is provided on the top of the base 10, which cooperates with the pressing surface of the pressing mechanism 20 provided above the base 10 to form a pressing space, and the shapes of the supporting surface and the pressing surface are adjustable, and the welded battery string 01 is placed in the pressing space.

[0029] During operation, the welded battery string 01 is first placed on the supporting surface. At this time, the pressing mechanism 20 descends so that its pressing surface contacts one surface of the battery string 01. At the same time, the other surface of the battery string 01 is pressed against the supporting surface of the base 10 through the pressing action of the pressing mechanism 20. Because the newly welded battery string 01 still has residual welding heat and good plasticity, the flattening effect of the pressing mechanism 20 is more significant. The cooling mechanism is provided on the pressing mechanism 20 to cool and shape the battery string 01 in the pressing space. Since the shapes of the pressing surface and the supporting surface are adjustable, the curvature shapes of the pressing surface and the supporting surface can be flexibly changed according to the degree of warping of the battery string 01 during the cooling process, thereby avoiding the problem of reverse warping of the battery string 01 caused by excessive bending.

[0030] Optionally, battery string 01 uses BC batteries. It should be noted that BC batteries, which are full back electrode contact (Back Contact) batteries, have the core feature of arranging metal electrodes in a forked shape on the back of the battery, leaving more valuable light absorption area for the front, thereby significantly improving the overall performance of the battery cell. Among them, the BC battery has a special arrangement of electrodes on the back, and there is no need to make extreme use of the effective illumination area, and the tolerance to the shape of the welding strip is relatively high. The component interconnection process continues the high requirements of the battery end for fine isolation of the N / P area, and pays special attention to local insulation treatment. The cross-layout of the back electrode of the BC battery requires the welding strip to be flattened, thinned and widened, and the welding process must be highly precise and stable to ensure smooth current and no short circuit risk. Since the IBC electrodes are all on the back, they cannot be interconnected in a straight line with a welding strip. The welding process of the IBC component requires a special interconnection welding strip for connection. The solutions proposed in the industry include conductive glue + flexible circuit backplane and tin-coated copper strip welding and ordinary backplane. The welded BC battery string 01 is prone to deformation and warping during the welding process, so a special pressing device is needed to solve these problems in order to improve production efficiency and product quality. However, the existing pressing device lacks more flexible adjustment for different flattening degrees of the battery string 01 during the pressing process. The pressing device provided in this embodiment can avoid the battery string 01 from being uneven or reversely warped.

[0031] Further, the pressing mechanism 20 includes a bracket and a plurality of pressing units 21. The bracket is arranged above the base 10 in a liftable manner. The plurality of pressing units 21 are arranged side by side on the bracket along the extension direction of the battery string 01, and each pressing unit 21 is arranged on the bracket in an adjustable manner in terms of its upper and lower positions. The bottom surfaces of the plurality of pressing units 21 jointly form a pressing surface, and along the extension direction of the battery string 01, the curvature of the bottom surface of the pressing unit 21 located in the middle is smaller than the curvature of the bottom surface of the pressing units 21 located at both ends.

[0032] In this embodiment, a plurality of pressing units 21 are arranged side by side on the bracket along the extension direction of the battery string 01, which can ensure that each position of the battery string 01 in the length direction can be cooled uniformly and in a targeted manner. Each pressing unit 21 is connected to the bracket through an independent driving mechanism to achieve its position adjustment in the vertical direction. The above structure can adapt to battery strings 01 with different degrees of warping, ensuring that each area can be compressed and cooled according to its warping characteristics. The bottom surface of the pressing unit 21 is designed to have a certain curvature, wherein the curvature of the bottom surface of the pressing unit 21 located in the middle is relatively small, and the curvature of the bottom surface of the pressing unit 21 at both ends is relatively large. The above structure can correct the warping of the battery string 01 by controlling the cooling rate of different areas. The central area has a smaller warping and adopts a smaller curvature to avoid overcooling; the warping at both ends is larger, and a larger curvature is adopted, which can provide a stronger cooling and shaping effect.

[0033] Specifically, a temperature sensor can be configured under each pressing unit 21 to monitor the temperature change of the battery string 01 in real time and feed it back to the control system so as to dynamically adjust the cooling rate. A pressure sensor is installed at the contact point between the pressing unit 21 and the battery string 01 to ensure that the pressing force is kept within a safe range during the cooling process to prevent damage to the battery string 01.

[0034] Specifically, the bracket is made of high-strength, heat-resistant metal material, such as stainless steel, to ensure that the structure is stable in a high-temperature environment and will not be deformed due to temperature changes.

[0035] Furthermore, the cooling mechanism includes a plurality of cooling air ducts 31, which are spaced apart along the extension direction of the battery string 01, and each cooling air duct 31 is connected to the pressing space. In this embodiment, according to the size and warping characteristics of the battery string 01, a plurality of cooling air ducts 31 are provided, and the plurality of cooling air ducts 31 are spaced apart along the extension direction of the battery string 01 to ensure that the temperature of the entire surface of the battery string 01 can be uniformly reduced. The opening of the cooling air duct 31 is provided on the lower pressing surface, and when the lower pressing mechanism 20 descends to press the battery string 01, the opening of the cooling air duct 31 directly contacts or is very close to the surface of the battery string 01 to ensure that the cooling effect directly acts on the battery string 01.

[0036] Specifically, the cooling air duct 31 should be made of a material with good thermal conductivity and high temperature resistance, such as stainless steel or aluminum alloy, to ensure cooling efficiency and stability in long-term use.

[0037] Furthermore, multiple cooling air ducts 31 are symmetrically distributed on the bracket along the midline of the lower pressure surface. In this embodiment, the cooling air ducts 31 are symmetrically distributed along the midline of the bracket, and the arrangement of the air ducts is based on the geometric center of the bracket. The number, size and position of the air ducts on the left and right sides are completely symmetrical, ensuring that during the downward pressure process, both sides of the battery string 01 receive the same cooling effect, avoiding asymmetric stress and potential warping or fragmentation problems caused by excessive cooling on one side.

[0038] Furthermore, the cooling air duct 31 is arranged between any two adjacent downward pressure units 21, which can ensure that the opening of each air duct faces a specific area of ​​the battery string 01, and there is no overlap between the air ducts, so as to achieve precise local cooling control. The width and length of the cooling air duct 31 should be adjusted according to the size and warping characteristics of the battery string 01 to ensure that the cooling airflow can evenly and effectively cover each area of ​​the battery string 01 that needs cooling.

[0039] Furthermore, a closed cooling chamber is formed between the two downward pressure units 21 on both sides of the cooling air duct 31, and the cooling air duct 31 includes an air inlet channel 311 and an air outlet channel 312, and the air inlet channel 311 and the air outlet channel 312 are distributed in the cooling chamber along the extension direction of the battery string 01, and the air inlet channel 311 and the air outlet channel 312 are respectively connected to the cooling chamber, and the air inlet of the air inlet channel 311 and the air outlet of the air outlet channel 312 are both located on the outside of the cooling chamber.

[0040] In this embodiment, a closed cooling chamber is formed between the two pressing units 21 on both sides of the cooling air duct 31. When the battery string 01 is placed on the support surface of the base 10 and the cooling process is started, the pressing unit 21 presses the battery string 01 tightly, and the cooling duct, the pressing surface and the surface of the battery string 01 form a closed cooling chamber. Among them, the cooling air duct 31 includes an air inlet channel 311 and an air outlet channel 312. Since the curvature of the two sides of the pressing mechanism 20 along the length direction of the battery is the largest, the cold air overflowing to both sides will be blocked and discharged through the air outlet channel 312, which can ensure that the cold air circulates in the cooling chamber and improve the cooling efficiency.

[0041] The air inlet channel 311 has an air inlet, and the air outlet channel 312 has an air outlet, wherein a fan is provided at the air inlet of each air inlet channel 311, and the fan at each air inlet is independently controlled, and the wind speed of each air inlet channel 311 can be changed to achieve different cooling effects on different positions of the battery string 01, thereby realizing uniform cooling of the battery string 01 along its extension direction.

[0042] Furthermore, the base 10 includes a base body and a plurality of lifting units 11. The plurality of lifting units 11 are arranged side by side on the base body along the extension direction of the battery string 01, each lifting unit 11 is arranged on the base body in an adjustable manner up and down, and the top surfaces of the plurality of lifting units 11 jointly form a support surface, and along the extension direction of the battery string 01, the curvature of the top surface of the lifting unit 11 located in the middle is smaller than the curvature of the top surface of the lifting units 11 located at both ends.

[0043] In this embodiment, the seat body serves as the base of the entire base 10 and must have sufficient strength and stability to bear the weight of the entire mechanism and ensure that no displacement occurs during operation. Multiple lifting units 11 are arranged side by side along the extension direction of the battery string 01 to ensure that each part of the battery string 01 in the length direction can be accurately supported and cooled. The position and number of the lifting units 11 should be designed according to the size and warping characteristics of the battery string 01 to achieve the best cooling effect. Among them, the upper and lower positions of each lifting unit 11 are adjustable. During the cooling process, the lifting height is adjusted according to the preset program or the real-time monitored temperature of the battery string 01, thereby changing the curvature of the support surface.

[0044] Furthermore, the lifting unit 11 is arranged in a one-to-one correspondence with the pressing unit 21. In this embodiment, under each pressing unit 21, a lifting unit 11 is arranged on the base 10. The one-to-one correspondence structure can ensure that the cooling and shaping effects of each pressing unit 21 can be adjusted independently and accurately, and can adapt to the warping degree of the battery string 01 in different areas to the greatest extent.

[0045] According to another aspect of the present invention, a method for processing warping of a battery string is provided, and the method for processing warping of a battery string comprises:

[0046] Place the soldered battery string 01 on the support surface;

[0047] The first stage: the battery string 01 is pressed down by the pressing mechanism 20 and the battery string 01 is cooled by the cooling mechanism. When the temperature of the battery string 01 reaches a preset range, the pressing and cooling process is stopped.

[0048] The second stage: the battery string 01 is pressed down and cooled for the second time by the pressing mechanism 20 and the cooling mechanism. When the temperature of the battery string 01 is between 20 and 30° C., the operation is terminated.

[0049] In this embodiment, the battery string 01 that has been soldered is placed stably on the support surface of the equipment base 10. The support surface should be able to adapt to the curvature of the bottom of the battery string 01 to provide preliminary support and positioning to prevent the battery string 01 from moving or further warping during the process. The first stage is to perform preliminary pressing and cooling: start the pressing mechanism 20, so that the pressing surface contacts the upper surface of the battery string 01, and apply appropriate pressure. Turn on the cooling mechanism to perform preliminary cooling treatment on the battery string 01 in the pressing space. Monitor the temperature of the battery string 01, and when the temperature of the battery string 01 drops to the preset range, automatically stop the operation of the pressing mechanism 20 and the cooling mechanism. The cooling at this stage is intended to perform preliminary shaping to avoid large warping when the battery string 01 is cured at high temperature. Among them, the preset range of cooling in the first stage is 30 to 50°C, for example, 30°C, 35°C, 40°C, and 45°C. The selection of this temperature range is based on the material properties of the battery string 01 and the thermal stability after welding, ensuring that while reducing the warping of the battery string 01, it avoids the problem of increased brittleness of the battery string 01 due to too low temperature or poor cooling effect due to too high temperature. The second stage is a secondary press and cooling: After the temperature of the battery string 01 reaches the preset range of the first stage, the second stage of cooling begins. The pressing mechanism 20 applies pressure to the battery string 01 again, and the pressing pressure can be adjusted to adapt to the current warping state and temperature changes of the battery string 01.

[0050] Furthermore, the cooling rate in the first stage is less than the cooling rate in the second stage. In this embodiment, the cooling rate of the cooling mechanism can be accelerated in the second stage to accelerate the temperature of the battery string 01 to a lower temperature range, such as 20 to 30°C, for example, 22°C, 25°C, 28°C, and 30°C. The cooling goal of this stage is to completely cool the battery string 01 to near room temperature to further reduce warping. At the same time, the temperature of the battery string 01 is continuously monitored throughout the second cooling stage to ensure that the cooling process does not cause additional stress or damage to the battery string 01 due to excessive speed. When the temperature of the battery string 01 drops to 20 to 30°C, the pressing and cooling operations are terminated. At this time, the battery string 01 should be in a relatively flat state and the warping is effectively controlled.

[0051] It can be understood that the cooling preset range of the first stage and the cooling preset range of the second stage can be adaptively adjusted according to actual conditions. In a specific embodiment of the present application, the cooling preset value of the first stage is 40°C, and the cooling preset value of the second stage is 25°C.

[0052] In another embodiment of the present invention, the cooling air duct 31 may also include a main air inlet duct and a main air outlet duct. Among them, the main air inlet duct is connected to multiple sub-air inlets, each of which is fixed and spaced inside the pressing mechanism 20, to play the role of air intake cooling. The main air outlet duct is connected to multiple sub-air outlet ducts, each of which is fixed and spaced inside the pressing mechanism 20, to play the role of air outlet. The pressing mechanism 20 is pressed down as a whole, and the cooling air duct 31 cooperates with the pressing mechanism 20 to achieve the flattening and shaping effect of the battery string 01.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressing device, characterized in that: The pressing device comprises: A base (10), wherein the top of the base (10) has a supporting surface; A pressing mechanism (20) is movably arranged above the base (10), the pressing mechanism (20) having a pressing surface, the pressing surface and the supporting surface are both curved surfaces, the pressing surface and the supporting surface cooperate to form a pressing space, the pressing space is used to place a battery string (01), the shapes of the pressing surface and the supporting surface are adjustable, the pressing surface is adapted to the upper surface of the battery string (01), and the supporting surface is adapted to the lower surface of the battery string (01); A cooling mechanism is arranged on the pressing mechanism (20), and is used to cool the pressing space.

2. The pressing device according to claim 1, characterized in that: The pressing mechanism (20) comprises: A bracket, which is liftably arranged above the base (10); A plurality of pressing units (21) are arranged side by side on the bracket along the extension direction of the battery string (01); each pressing unit (21) is arranged on the bracket in an adjustable vertical position; the bottom surfaces of the plurality of pressing units (21) together form the pressing surface; along the extension direction of the battery string (01), the curvature of the bottom surface of the pressing unit (21) located in the middle is smaller than the curvature of the bottom surface of the pressing unit (21) located at both ends.

3. The pressing device according to claim 2, characterized in that: The cooling mechanism comprises a plurality of cooling air ducts (31), the plurality of cooling air ducts (31) being distributed at intervals along the extension direction of the battery string (01), and each of the cooling air ducts (31) being connected to the pressing space.

4. The pressing device according to claim 3, characterized in that: The plurality of cooling air ducts (31) are symmetrically distributed on the bracket along the midline of the lower pressure surface.

5. The pressing device according to claim 3, characterized in that: The cooling air duct (31) is arranged between any two adjacent pressing units (21).

6. The pressing device according to claim 5, characterized in that: A closed cooling chamber is formed between the two lower pressure units (21) on both sides of the cooling air duct (31), and the cooling air duct (31) comprises an air inlet channel (311) and an air outlet channel (312), the air inlet channel (311) and the air outlet channel (312) are distributed in the cooling chamber along the extension direction of the battery string (01), the air inlet channel (311) and the air outlet channel (312) are respectively connected to the cooling chamber, and the air inlet of the air inlet channel (311) and the air outlet of the air outlet channel (312) are both located outside the cooling chamber.

7. The pressing device according to claim 2, characterized in that: The base (10) comprises: seat body; A plurality of lifting units (11) are arranged side by side on the base along the extension direction of the battery string (01); each lifting unit (11) is arranged on the base in an adjustable vertical position; the top surfaces of the plurality of lifting units (11) jointly form the support surface; along the extension direction of the battery string (01), the curvature of the top surface of the lifting unit (11) located in the middle is smaller than the curvature of the top surface of the lifting units (11) located at both ends.

8. The pressing device according to claim 7, characterized in that: The lifting unit (11) and the pressing unit (21) are arranged in a one-to-one correspondence.

9. A method for treating battery string warping, characterized in that: The battery string warping treatment method is applied to the pressing device according to any one of claims 1 to 8, and the battery string warping treatment method comprises: Placing the battery string (01) after string welding on a supporting surface; The first stage: pressing down the battery string (01) by a pressing mechanism (20) and cooling the battery string (01) by a cooling mechanism, and when the temperature of the battery string (01) reaches a preset range, stopping the pressing and cooling process; The second stage: the battery string (01) is pressed down and cooled for a second time by the pressing mechanism (20) and the cooling mechanism, and the operation is terminated when the temperature of the battery string (01) is between 20 and 30° C.; Wherein, the battery string (01) is made of BC batteries.

10. The battery string warping treatment method according to claim 9, characterized in that: The cooling rate of the first stage is lower than the cooling rate of the second stage.

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