Battery shaping method and battery shaping apparatus

Abstract

The battery shaping method and the battery shaping device provided by the present disclosure relate to the technical field of battery manufacturing. The battery shaping method is applied before the formation step, and comprises the following steps: applying a preset pressure on a battery; heating the battery; cooling the heated battery; repeating the heating and cooling of the battery for multiple times; and wherein the battery is always under the preset pressure during the heating and cooling of the battery. The battery shaping method can keep the battery with good flatness, improve the flatness and straightness of the battery, and reduce the difficulty of feeding the battery during the formation.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and more specifically, to a battery shaping method and battery shaping equipment. Background Technology

[0002] As the basic unit of new energy vehicle modules, the straightness and flatness of the battery directly affect the assembly efficiency of the module. Currently, the battery is mainly constrained and shaped by fixtures during the formation process.

[0003] Because of the battery's length, the battery casing deforms during manufacturing. Furthermore, the casing is assembled using laser welding, which generates heat. The stress release from the welding process can cause battery deformation, making it difficult to insert the battery during formation. Additionally, after formation, the battery's flatness and parallelism are difficult to restore, resulting in poor flatness and parallelism, increasing the difficulty of module assembly and reducing assembly efficiency. Summary of the Invention

[0004] The objectives of this invention include, for example, providing a battery shaping method and battery shaping equipment that can improve the flatness and parallelism of the battery, reduce the difficulty of material feeding during formation, and improve assembly efficiency.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a battery shaping method, applied before a formation step, the method comprising:

[0007] Apply a preset pressure to the battery;

[0008] Heating the battery;

[0009] The heated battery is then cooled.

[0010] The battery is heated and cooled repeatedly.

[0011] During the heating and cooling process, the battery is always subjected to a preset pressure.

[0012] In an optional embodiment, the step of cooling the heated battery further includes:

[0013] Cool the battery to 20–25°C;

[0014] The battery is left to cool for 10-15 minutes after standing.

[0015] In an optional implementation, the steps of repeatedly heating and cooling the battery include:

[0016] The total cycle time for heating and cooling the battery is 20 to 30 hours;

[0017] Alternatively, the battery may be subjected to 20 to 30 cycles of heating and cooling.

[0018] In an optional implementation, the method further includes:

[0019] After the battery is cooled for the last time, let the battery stand for 20 to 30 minutes;

[0020] Remove the battery after it has been left to stand, and perform a flatness test.

[0021] In an optional implementation, the step of heating the battery includes:

[0022] Heat the battery to 55-60°C for 20-30 minutes.

[0023] The step of cooling the heated battery includes:

[0024] Cool the battery to 20–25°C for 10–20 seconds.

[0025] In an optional implementation, the step of applying a preset pressure to the battery includes:

[0026] The battery is a square battery, and the battery includes a first large surface and a second large surface that are arranged opposite to each other.

[0027] A preset pressure is applied to the first large surface and the second large surface respectively; wherein the preset pressure is perpendicular to the first large surface and the second large surface respectively, so as to hold the battery;

[0028] The preset pressure is 5000-5500N.

[0029] In a second aspect, the present invention provides a battery shaping device, applied to the battery shaping method as described in any of the foregoing embodiments, the device comprising:

[0030] A clamp for holding the battery;

[0031] A driver, which is connected to the clamp, is used to apply a preset pressure to hold the battery;

[0032] A heating device, wherein the heating device is disposed in the clamp;

[0033] A cooling device, wherein the cooling device is disposed in the clamp;

[0034] The heating device and the cooling device alternately heat and cool the battery in a cycle.

[0035] In an optional embodiment, the clamp includes a first clamping plate and a second clamping plate disposed opposite to each other;

[0036] At least one of the first clamping plate and the second clamping plate is drivenly connected to the driver so that the first clamping plate and the second clamping plate are close to each other to press the battery;

[0037] The heating device includes heating elements, which are respectively disposed on the first clamping plate and the second clamping plate;

[0038] The cooling device includes cooling channels respectively disposed on the first clamping plate and the second clamping plate, the cooling channels being used for the flow of a cooling medium.

[0039] In an optional embodiment, the first clamping plate and the second clamping plate each include a pressing surface for clamping the battery;

[0040] The distance between the heating element and the pressing surface is 2 to 2.5 mm;

[0041] The distance between the cooling channel wall on the side closest to the pressing surface and the pressing surface is 5-6 mm.

[0042] In an optional embodiment, the first clamping plate and the second clamping plate each include a pressing surface for clamping the battery;

[0043] The cooling channel is spaced apart from the heating element, and the heating element is located between the pressing surface and the cooling channel;

[0044] Alternatively, the heating element may be located within the cooling channel.

[0045] The beneficial effects of the embodiments of the present invention include, for example:

[0046] The battery shaping method provided in this invention shapes the battery before the formation process, reducing the difficulty of material feeding during formation. Furthermore, by repeatedly heating and cooling the battery using alternating hot and cold methods, internal stress in the battery casing is released, preventing structural warping and deformation, and improving the battery's flatness, parallelism, and straightness, thereby reducing assembly difficulty and increasing assembly efficiency.

[0047] The battery shaping equipment provided in this invention integrates a heating device and a cooling device on a clamp. While clamping the battery, it can repeatedly and alternately heat and cool the battery, release the stress inside the battery casing, improve the flatness and straightness of the battery, and has a compact structure, high shaping efficiency, and good shaping effect. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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.

[0049] Figure 1 A flowchart illustrating the battery shaping method provided in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram illustrating an application scenario of the battery shaping equipment provided in an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of a battery structure provided in an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the structure of the first clamping plate of the battery shaping device provided in an embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of another structure of the first clamping plate of the battery shaping device provided in an embodiment of the present invention.

[0054] Icons: 100-Battery shaping equipment; 110-Clamp; 111-First clamping plate; 113-Second clamping plate; 115-Pressure holding surface; 120-Heating element; 130-Cooling channel; 140-Air inlet; 200-Battery; 210-First large surface. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0057] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not 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 invention.

[0059] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0060] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0061] Most existing battery shaping processes are performed simultaneously with the formation process. However, due to the long size of the battery, the battery casing deforms during manufacturing. Furthermore, the casing is assembled using laser welding, which generates heat. Stress release in the casing can cause battery deformation, making it difficult to load the battery during formation. It is particularly challenging to fit severely deformed batteries into the formation fixture. Moreover, the flatness and parallelism of the battery are difficult to restore after formation, resulting in poor flatness and parallelism. This increases the difficulty of assembling the battery in the module and reduces assembly efficiency.

[0062] To overcome at least one deficiency in the prior art, this embodiment provides a battery shaping method applied before the formation step, effectively solving the problem of difficult material feeding during formation. Furthermore, it effectively improves the flatness and parallelism of the battery, reducing the assembly difficulty of the battery in the module and improving assembly efficiency.

[0063] First Embodiment

[0064] Please refer to Figures 1 to 3 This embodiment provides a battery 200 shaping method, including:

[0065] Step S100: Apply a preset pressure to the battery 200;

[0066] Step S200: Heat battery 200;

[0067] Step S300: Cool the heated battery 200;

[0068] Step S400: Repeat heating and cooling of battery 200 multiple times.

[0069] During the heating and cooling process of battery 200, battery 200 is always under a preset pressure. This battery 200 shaping method can maintain good flatness of battery 200, improve the flatness, parallelism and straightness of battery 200, and reduce the difficulty of material feeding during battery 200 formation.

[0070] It is understandable that since the shaping step of battery 200 occurs before the formation step, meaning that battery 200 enters the formation equipment while maintaining good flatness, planarity, parallelism, and straightness, the problem of difficult feeding of battery 200 during formation is solved, which is beneficial to improving formation efficiency. Furthermore, this battery 200 shaping method uses alternating hot and cold treatment, repeatedly heating and cooling battery 200, which helps release internal stress in the battery 200 casing, prevents structural warping and deformation, and improves the planarity, parallelism, and straightness of battery 200. This reduces the assembly difficulty of battery 200 in the module and improves assembly efficiency.

[0071] In step S100, a preset pressure is applied to the battery 200. In this embodiment, the battery 200 is a square battery 200, and the battery 200 is relatively long with a large length-to-width ratio, such as a length-to-width ratio greater than 10:1. The length of the battery 200 is 1199-1200 mm, the width is 100-110 mm, and the thickness is 13.5-14 mm.

[0072] As easily understood, the battery 200 includes a first large surface 210 and a second large surface (not shown in the figure) positioned opposite each other. A preset pressure is applied to both the first large surface 210 and the second large surface, perpendicular to both surfaces, to hold the battery 200 in place. This preset pressure causes the first large surface 210 and the second large surface to tend towards each other, clamping the battery 200 and ensuring it maintains good flatness, parallelism, and straightness. The preset pressure is typically 5000–5500 N. Of course, the preset pressure can be flexibly adjusted according to actual needs.

[0073] Optionally, the applied preset pressure can be controlled by adjusting the distance between the first clamping plate 111 and the second clamping plate 113. For example, during the application of force, the first clamping plate 111 and the second clamping plate 113 are brought closer together, reducing the distance between them by 0.3 to 1 mm. Optionally, the distance between the first clamping plate 111 and the second clamping plate 113 is reduced by approximately 0.5 mm. It is understood that if the preset pressure is too high, the battery 200 may be damaged; if the preset pressure is too low, the shaping effect of the battery 200 will be poor.

[0074] In this embodiment, a preset pressure is applied to the battery 200 by a clamp 110. The clamp 110 includes a first clamping plate 111 and a second clamping plate 113 disposed opposite to each other. The first clamping plate 111 and the second clamping plate 113 each have a pressing surface 115. The battery 200 is located between the first clamping plate 111 and the second clamping plate 113, that is, the battery 200 is located between the two pressing surfaces 115, and the first large surface 210 of the battery 200 is in contact with one of the pressing surfaces 115, and the second large surface of the battery 200 is in contact with the other pressing surface 115. During the application of pressure, the first clamping plate 111 and the second clamping plate 113 are squeezed together to bring them closer to each other to clamp the battery 200, so that the battery 200 maintains good flatness, parallelism and straightness.

[0075] In this embodiment, in step S200, when heating the battery 200, the battery 200 is heated to 55-60°C; the heating time is 20-30 minutes; the heating method can be baking, resistance wire heating or steam heating, etc., and no specific limitation is made here.

[0076] Optionally, in step S300, when cooling the heated battery 200, the battery 200 is first cooled to 20-25°C; then, the cooled battery 200 is left to stand for 200 minutes. This method of cooling first and then allowing it to stand helps to better release the internal stress of the battery 200 casing and improves the structural warping of the battery 200. It should be noted that a preset pressure is also applied to the battery 200 while it is standing to maintain good flatness.

[0077] In this embodiment, when cooling the heated battery 200, a rapid cooling method is adopted to cool the battery 200 to 20-25°C; the cooling time is 10-20 seconds. The cooling rate is 1.5°C to 4°C per second. The rapid cooling method helps to release the internal stress of the battery 200 casing and improve the flatness of the battery 200.

[0078] In step S400, when the battery 200 is repeatedly heated and cooled, the total cycle time for heating and cooling the battery 200 is 20 to 30 hours. That is, in one shaping process, the cycle of alternating heating and cooling of the battery 200 is 20 to 30 hours. For example, the cycle time is 21 hours, 22 hours, 23 hours, 24 hours, 25 hours, 26 hours, 27 hours, 28 hours, or 29 hours, etc.

[0079] Alternatively, in other embodiments, the number of heating and cooling cycles for the battery 200 in a single shaping process is 20 to 30 times, such as 20, 21, 22, 23, 24, 25, 26, 27, or 28 cycles, etc., without specific limitation. Of course, it is not limited to this; the alternating cycle duration and number of cycles in a single shaping process can be determined according to actual shaping needs. For example, the cycle period for repeated alternating heating and cooling of the battery 200 may be greater than or equal to 20 hours, and the number of repeated alternating heating and cooling cycles may be greater than or equal to 20 times. Naturally, the actual cycle duration and number of cycles can be flexibly adjusted and set.

[0080] It should be noted that after the alternating heating and cooling steps, and after the final cooling of the battery 200, the battery is left to stand for 200 minutes. The method also includes step S500.

[0081] Step S500: Remove the battery 200 after it has been left to stand and perform a flatness test. Optionally, the flatness of the battery 200 can be tested using a thickness testing device or a height gauge to screen out batteries 200 that meet the flatness requirements, which helps control the pass rate of the battery 200 products. Of course, the straightness or parallelism of the battery 200 can also be detected using a rangefinder or other measuring devices; no specific limitation is made here.

[0082] The final resting time before the battery 200 is unloaded can be the same as the resting time of the battery 200 during the alternating hot and cold cycle, for example, 10-15 minutes; or it can be different from the resting time of the battery 200 during the alternating hot and cold cycle. In this embodiment, the final resting time before the battery 200 is unloaded is slightly longer than the resting time of the battery 200 during the alternating hot and cold cycle, which is beneficial for better releasing the stress on the battery 200 casing and improving the flatness of the battery 200 under the action of the preset pressure.

[0083] In this embodiment, one implementation step of the battery 200 shaping method can be as follows:

[0084] First, place the battery 200 in the clamp 110, and apply a preset pressure, such as 5000~5500N, to the battery 200 through the clamp 110.

[0085] The battery 200 is heated by the clamp 110. The heating time is 25 to 30 minutes and the heating temperature is 55 to 60°C.

[0086] Battery 200 is rapidly cooled. A cooling medium is introduced into the clamp 110. The cooling medium includes, but is not limited to, cool gas or cool liquid. For example, cool gas can be nitrogen or air; cool liquid can be water or oil. The cooling time is 10-15 seconds, and the temperature of battery 200 after cooling is 20-25°C. It is then left to stand for 10-15 minutes.

[0087] After resting, the battery 200 is heated, cooled, and rested again, and this cycle is repeated, with a cycle time of approximately 24 hours.

[0088] After a hot-cold cycle, the battery is left to stand for 200 minutes. Then, the preset pressure applied to battery 200 is released, and battery 200 is removed. A flatness test is performed on battery 200, and batteries 200 that pass the flatness test are selected.

[0089] This battery 200 shaping method is simple to operate and easy to control. It employs alternating hot and cold cycles to repeatedly release stress in the battery 200 over a prolonged period until most or all stress is eliminated, improving surface warping and enhancing the flatness of the battery 200. Furthermore, this shaping step is performed before the formation process, i.e., after the battery 200 is packaged. This helps improve the product yield of the battery 200 and reduces the difficulty of material feeding during formation. It also helps ensure good flatness, parallelism, and straightness of the battery 200 during subsequent module assembly, improving assembly efficiency and consistency. This battery 200 shaping method is particularly suitable for square batteries 200 with a large aspect ratio, but it is also applicable to batteries 200 of any other shape.

[0090] Second Embodiment

[0091] Combination Figures 2 to 5 This invention also provides a battery shaping device 100, applied to the battery 200 shaping method as described in any of the foregoing embodiments. The device includes a clamp 110, a driver (not shown), a heating device, and a cooling device. The clamp 110 is used to hold the battery 200; the driver is drivenly connected to the clamp 110 and is used to apply a preset pressure to hold the battery 200. The heating device is disposed in the clamp 110 and is used to heat the battery 200. The cooling device is disposed inside the clamp 110 and is used to rapidly cool the battery 200. The heating device and the cooling device alternately heat and cool the battery 200 in a cyclic manner to release stress on the battery 200 casing, improve the warping deformation of the battery 200, and enhance the flatness and yield of the battery 200.

[0092] Optionally, the clamp 110 includes a first clamping plate 111 and a second clamping plate 113 disposed opposite to each other. At least one of the first clamping plate 111 and the second clamping plate 113 is drivenly connected to a driver so that the first clamping plate 111 and the second clamping plate 113 are close to each other to press the battery 200. The first clamping plate 111 and the second clamping plate 113 each include a pressing surface 115 for clamping the battery 200; the battery 200 is a square battery 200, and the two large surfaces of the square battery 200, namely the first large surface 210 and the second large surface, are in contact with the pressing surface 115. It is understood that the area of ​​the pressing surface 115 is larger than the area of ​​the first large surface 210 or the second large surface, so that the battery 200 is reliably pressed and the flatness of the first large surface 210 and the second large surface is effectively improved.

[0093] In this embodiment, the driver can be a motor. Of the first clamping plate 111 and the second clamping plate 113, one is fixed, while the other, under the action of the driver, can move closer to or further away from the fixed clamping plate. An adjusting member is provided on either the first clamping plate 111 or the second clamping plate 113, and the adjusting member is threadedly connected to the first clamping plate 111 or the second clamping plate 113. The motor is connected to the adjusting member; the rotation of the motor drives the adjusting member to rotate, causing the first clamping plate 111 and the second clamping plate 113 to move closer to each other. Optionally, the adjusting member can be an adjusting bolt or a screw. Since the movement distance of the first clamping plate 111 or the second clamping plate 113 is small during this force application process, less than or equal to 1 mm, using a threaded rotation method to achieve linear movement of the first clamping plate 111 or the second clamping plate 113 is beneficial for controlling movement accuracy and improving force application accuracy. Furthermore, this threaded rotation adjustment method helps to smoothly apply the preset pressure to the battery 200, preventing excessively rapid impact forces from damaging the battery 200.

[0094] Of course, in other embodiments, the movement of the first clamping plate 111 or the second clamping plate 113 can also be achieved by means of electric push rods, linear cylinders or hydraulic cylinders.

[0095] Optionally, the heating device includes heating elements 120, which are respectively disposed on the first clamping plate 111 and the second clamping plate 113. In this embodiment, the heating elements 120 are nickel-chromium heating elements 120. The heating elements 120 can be laid inside the first clamping plate 111 and the second clamping plate 113, and the heating elements 120 are arranged opposite to the pressing surface 115. In this embodiment, the area of ​​the heating elements 120 is greater than or equal to the area of ​​the first large surface 210 or the second large surface, or approximately equal to the area of ​​the pressing surface 115, so that the battery 200 can be heated quickly, with higher heating efficiency and more uniform heating. Optionally, the heating elements 120 are respectively disposed inside the first clamping plate 111 and the second clamping plate 113, and the distance between the heating elements 120 and the pressing surface 115 is a first distance D1, which is 2 to 2.5 mm. This arrangement also helps to improve heating efficiency.

[0096] The cooling device includes cooling channels 130 respectively disposed on the first clamping plate 111 and the second clamping plate 113, which are used for the flow of a cooling medium. In this embodiment, nitrogen is used as the cooling medium. A relatively large cavity is provided in both the first clamping plate 111 and the second clamping plate 113, and the cavity serves as the cooling channel 130. The cross-sectional area of ​​the cavity is approximately equal to the area of ​​the pressure surface 115. This increases the flow area of ​​the cooling medium, improves cooling efficiency, and achieves rapid cooling.

[0097] Of course, in other embodiments, multiple connected or disconnected cavities can be used as cooling channels 130, wherein the cross-section of the cavity can be rectangular, circular, elliptical or other arbitrary shapes, without specific limitations.

[0098] In this embodiment, one or more air inlets 140 are provided on one side of the first clamping plate 111, and one or more air outlets (not shown) are provided on the other side. The air inlets 140 and the air outlets are respectively connected to the internal cooling channel 130 (cavity). The figure shows multiple air inlets 140 arranged at intervals, which can improve the uniformity and volume of air intake. The air outlets can be arranged opposite to the air inlets 140, which is beneficial to improve the flow area and flow efficiency of the cooling medium, and the distribution of the cooling medium is more uniform. While improving the cooling efficiency, it also improves the uniformity of cooling of the battery 200, which is beneficial to further release the stress inside the battery 200 casing, improve the flatness of the battery 200, and improve the shaping effect.

[0099] The first clamping plate 111 and the second clamping plate 113 have rectangular cross-sections. The air inlet 140 and the air outlet are respectively located on the two sides of the long side of the clamping plate. This allows for more air inlets 140 and air outlets, which helps to increase the air intake volume and efficiency, thereby improving the cooling efficiency and uniformity of the battery 200. Of course, the clamping plates can also be circular, elliptical, or other arbitrary shapes; no specific limitation is made here.

[0100] Optionally, combined Figure 4 The cooling channel 130 and the heating element 120 are spaced apart in the thickness direction of the clamping plate. The distance between the channel wall of the cooling channel 130 near the pressing surface 115 and the pressing surface 115 is a second distance D2, which is 5-6 mm. This arrangement facilitates rapid cooling of the battery 200. In this embodiment, the heating element 120 is closer to the pressing surface 115, that is, the heating element 120 is located between the pressing surface 115 and the cooling channel 130, which can shorten the heating time of the battery 200, improve the heating efficiency, and thus improve the shaping efficiency of the battery 200.

[0101] In other embodiments, combined with Figure 5The heating element 120 can also be located within the cooling channel 130. For example, the distance between the channel wall of the cooling channel 130 near the pressing surface 115 and the pressing surface 115 is 2 to 2.5 mm, and the heating element 120 is located on the channel wall of the cooling channel 130 near the pressing surface 115. This structure is more compact and is conducive to improving heating and cooling efficiency.

[0102] It should be noted that the structure and principle of the heating and cooling devices on the second clamping plate 113 are similar to those on the first clamping plate 111, and will not be described again here.

[0103] Optionally, in this embodiment, the first clamping plate 111 and the second clamping plate 113 are made of aluminum or steel, with a thickness of approximately 20-25 mm, to ensure structural strength and rigidity. If the first clamping plate 111 and the second clamping plate 113 are hollow, and the heating element 120 is disposed within the cooling channel 130, the wall thickness of the first clamping plate 111 and the second clamping plate 113 is approximately 2-2.5 mm.

[0104] Other parts not mentioned in this embodiment are similar to those described in the first embodiment and will not be repeated here.

[0105] In summary, the battery shaping method 200 and battery shaping equipment 100 provided in the embodiments of the present invention have the following beneficial effects:

[0106] The battery 200 shaping method provided in this invention shapes the battery 200 before the formation process, reducing the difficulty of material feeding during formation. Furthermore, by repeatedly heating and cooling the battery 200 using alternating hot and cold methods, the internal stress of the battery 200 casing is released, preventing structural warping and deformation, and improving the flatness, parallelism, and straightness of the battery 200. This reduces the assembly difficulty of the battery 200 in subsequent module assembly, improving assembly efficiency and consistency.

[0107] The battery shaping equipment 100 provided in this embodiment of the invention integrates a heating device and a cooling device on a clamp 110. While clamping the battery 200, it can repeatedly and alternately heat and cool the battery 200, releasing the stress inside the battery 200 casing, improving the flatness and straightness of the battery 200. It features a compact structure, high shaping efficiency, and good shaping effect. The high degree of integration and compact structure fully utilize the clamping, heating, and cooling functions of the clamp 110, improving the shaping effect, enhancing the flatness and pass rate of the battery 200, reducing the assembly difficulty of the battery 200 in the module, and increasing assembly efficiency.

[0108] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery shaping method, characterized in that, A method applied prior to the formation step to release internal stress in the battery casing and prevent structural warping or deformation, the method comprising: Apply a preset pressure to the battery; Heat the battery; heat the battery to 55~60°C; heat for 20~30 minutes; Cool the heated battery to 20-25°C for 10-20 seconds. The battery is repeatedly heated and cooled; the total cycle time for heating and cooling the battery is 20 to 30 hours; or, the number of cycles for heating and cooling the battery is 20 to 30 times. Each time the battery is cooled, it is left to stand before being heated again. During the heating and cooling process, as well as during the resting process, the battery is always under a preset pressure.

2. The battery sizing method of claim 1, wherein, The step of cooling the heated battery further includes: Cool the battery to 20~25°C; The battery is left to cool for 10-15 minutes after standing.

3. The battery sizing method of claim 1, wherein, The method further includes: After the battery has been cooled for the last time, let it stand for 20 to 30 minutes. Remove the battery after it has been left to stand, and perform a flatness test.

4. The battery sizing method of claim 1, wherein, The steps of applying a preset pressure to the battery include: The battery is a square battery, and the battery includes a first large surface and a second large surface that are arranged opposite to each other. A preset pressure is applied to the first large surface and the second large surface respectively; wherein the preset pressure is perpendicular to the first large surface and the second large surface respectively, so as to hold the battery; The preset pressure is 5000~5500N.

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