Battery film sticking device and film sticking machine

Abstract

The utility model relates to the technical field of batteries, and provides a battery film sticking device and a film sticking machine. The battery film pasting device comprises a film releasing roller, a film pulling roller, a supporting roller, a heating assembly and a film pasting roller, wherein the film releasing roller is used for placing a blue film roll; the film drawing roller is used for drawing the free end of the blue film unfolded from the blue film roll; the supporting roller is arranged between the film releasing roller and the film drawing roller so as to tension the blue film between the film releasing roller and the film drawing roller; at least part of the heating assembly is arranged between the supporting roller and the film drawing roller and located on at least one side of the blue film, and the heating assembly is used for controlling the temperature range of the blue film to be 40-100 DEG C; the film pasting roller is located between the heating assembly and the film drawing roller and used for pasting a heated blue film on the surface of the battery. The battery film pasting device adopts a heating film pasting mode to reduce the proportion of bubbles / wrinkles of the blue film on the large surface or the side surface of the battery in the film pasting process, so that the film tearing rework proportion is reduced, the film pasting difficulty and the production cost are reduced, and the yield and the efficiency of one-time film pasting are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery film application device and film application machine. Background Technology

[0002] The energy storage industry is currently in a phase of rapid development. Lithium-ion battery modules used for energy storage must have high energy density, which means that a single battery will have high capacity and a large volume. When the battery casing is metal, a blue film needs to be wrapped around the surface of the casing for insulation purposes to prevent short circuits. When attaching the blue film to the casing surface, problems may arise where the blue film cannot adhere smoothly, leading to abnormalities such as bubbles / wrinkles after attachment. Furthermore, in the lithium-ion battery manufacturing process, multiple processes involve negative pressure conditions, such as assembly negative pressure airtightness testing, high negative pressure during the first electrolyte injection, high negative pressure during formation, and high negative pressure during the second injection. These negative pressure conditions can cause concave abnormalities on the sides and / or large surfaces of the battery, which severely affects the quality of the film attachment and easily leads to abnormalities such as bubbles / wrinkles after the blue film is attached to the battery surface.

[0003] It is worth noting that when a problem occurs with the film application, manual removal of the film from the defective batteries is required for rework, with a defect rate as high as 15%, which seriously affects the production cycle and increases production costs. Utility Model Content

[0004] This utility model provides a battery film application device and a film application machine. The battery film application device uses a heated film application method during the film application process to reduce the proportion of bubbles / wrinkles on the blue film located on the large surface or side of the battery during the film application process, thereby reducing the proportion of rework after film removal, reducing the difficulty of film application and production costs, and improving the yield and efficiency of film application in one go.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] According to a first aspect of the present invention, a battery film applicator is provided, comprising:

[0007] A film-feeding roller, used to hold blue film rolls;

[0008] A film-pulling roller, used to pull the free end of the blue film unrolled from the blue film roll;

[0009] A support roller is provided between the film feeding roller and the film pulling roller to tension the blue film located between the film feeding roller and the film pulling roller;

[0010] A heating assembly, at least a portion of which is disposed between the support roller and the film pulling roller and located on at least one side of the blue film, is used to heat the blue film and control the temperature range of the blue film to be 40°C to 100°C;

[0011] A film-applying roller, located between the heating assembly and the film-pulling roller, is used to apply the heated blue film to the surface of the battery.

[0012] According to a second aspect of the present invention, a film applicator is provided, comprising a battery film applicator as provided in any of the technical solutions of the first aspect above.

[0013] This application provides a battery film applicator in which a film-laying roller is used to hold a blue film roll. The free end of the blue film roll passes around a support roller and extends and is fixed to the surface of a film-pulling roller, so that the blue film can be effectively unfolded within the battery film applicator. During the film applicator operation, the heated blue film can be attached to the battery surface by the film-laying roller.

[0014] It should be noted that the battery film application device provided in this application heats the blue film using a heating component and then applies the heated blue film to the battery surface. This hot-applied film application method allows the tension of the blue film to be released more easily after it is applied to the battery surface, making it less prone to stress accumulation, and making it easier for the blue film to adhere smoothly to the battery surface.

[0015] Therefore, the battery film application device uses a heated film application method during the film application process to reduce the proportion of bubbles / wrinkles on the blue film located on the large surface or side of the battery during the film application process, thereby reducing the proportion of rework after film removal, reducing the difficulty of film application and production costs, and improving the yield and efficiency of film application in one go. Attached Figure Description

[0016] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0017] Figure 1 This is a simplified structural diagram of the battery film application device provided in the embodiments of this application;

[0018] Figure 2 The graph shows the peel force data of the blue film at different temperatures;

[0019] Figure 3 The graph shows the film application test data after 7 rolls of blue film were stored at 45°C for 12 hours.

[0020] Figure 4This is a simplified schematic diagram of another structure of the battery film application device provided in the embodiments of this application.

[0021] The annotations in the attached figures are explained as follows:

[0022] 01. Blue film roll; 011. Blue film; 02. Battery; 100. Film feeding roller; 200. Film pulling roller; 300. Support roller; 400. Heating assembly; 500. Correction assembly; 600. Film applying roller; 610. First roller body; 620. Second roller body. Detailed Implementation

[0023] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0024] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0025] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0026] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element (one or more) "upper," "lower," "inner," or "outer," it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0027] In a first aspect, embodiments of this application provide a battery film applicator. Figure 1This is a simplified structural diagram of the battery film application device provided in an embodiment of this application. Figure 1 As shown, the battery film applicator includes: a film-laying roller 100, a film-pulling roller 200, a support roller 300, a heating assembly 400, and an applicator roller 600. The film-laying roller 100 is used to place a blue film roll 01; the film-pulling roller 200 is used to pull the free end of the blue film 011 unrolled from the blue film roll 01; the support roller 300 is disposed between the film-laying roller 100 and the film-pulling roller 200 to tension the blue film 011 located between the film-laying roller 100 and the film-pulling roller 200; at least a portion of the heating assembly is disposed between the support roller 300 and the film-pulling roller 200 and located on at least one side of the blue film 011, for heating the blue film 011 and controlling the temperature range of the blue film 011 to be 40°C to 100°C; the applicator roller 600 is located between the heating assembly 400 and the film-pulling roller 200, for applicating the heated blue film 011 onto the surface of the battery 02. It is understood that the film feeding roller 100, the film pulling roller 200, the support roller 300, the heating component 400, and the film applying roller 600 can be fixed relative to the ground by the same or different frames. For example, the above rollers can be fixed on the film applying machine.

[0028] In the battery film applicator provided in this application embodiment, the film-laying roller 100 is used to place the blue film roll 01. The free end of the blue film roll 01 passes around the support roller 300 and extends and is fixed to the surface of the film-pulling roller 200, so that the blue film 011 can be effectively unfolded in the battery film applicator. During the film applicator operation, the heated blue film 011 can be attached to the outer surface of the battery 02 by the film-applying roller 600.

[0029] It should be understood that when the blue film roll 01 is fixed to the surface of the film pulling roller 200, the blue film in the blue film roll 01 has blue film adhesive on one side, so the blue film can adhere to the surface of the film pulling roller 200 through the blue film adhesive. Therefore, the film pulling roller 200 can be started to pull the film directly without rotating and winding the blue film.

[0030] It is worth noting that when the battery 02 is cold-applied, stress tends to concentrate due to the low surface temperature of the battery 02 and the low peel force of the blue film 011. This stress concentration can lead to wrinkles in the film after it is released. It should be explained that the battery film applicator provided in this embodiment heats the blue film 011 using a heating component 400 and then applies the heated blue film 011 to the surface of the battery 02. This hot-applied method allows the tension of the blue film 011 to be released more easily after it is applied to the surface of the battery 02, preventing stress buildup and making it easier for the blue film 011 to adhere smoothly to the surface of the battery 02.

[0031] Therefore, the battery film applicator provided in this application uses a heated film applicator during the film applicator process to reduce the proportion of bubbles / wrinkles appearing on the blue film 011 located on the large surface or side of the battery 02 during the film applicator process, thereby reducing the proportion of film removal and rework, reducing the difficulty of film applicator application and production costs, and improving the yield and efficiency of film applicator application.

[0032] Currently, the battery film application device provided in this application embodiment has been introduced into mass production of the L173F230A / L173F125A production lines. A comparison of the film application processes at various production bases reveals that air bubbles are present in the film application process. Statistics show that the air bubble / wrinkle ratio for the L173 series battery 02 film application is less than 0.01%, with a first-pass yield of 99.98%, demonstrating a good improvement effect. Other production lines have an air bubble / wrinkle ratio of approximately 10%.

[0033] It is worth noting that the square battery 02 includes two large surfaces arranged opposite each other and four side surfaces arranged around the large surfaces to close the opening between the two large surfaces. The battery film applicator provided in this application embodiment is used to apply a blue film 011 to the large surfaces and / or side surfaces of the battery 02, and the specific configuration can be made according to requirements.

[0034] In one embodiment, the heating assembly 400 includes a heating element and a control element, the control element being connected to the heating element to control the heating element to heat the blue film 011. It is worth noting that the heating element is used to be positioned on one or both sides of the blue film 011 to effectively heat the blue film 011 and improve the first-pass bonding yield.

[0035] In one specific embodiment, the heating element includes a heating plate or a heating box.

[0036] As an example, such as Figure 1 As shown, the heating element includes a heating plate arranged along the extension direction of the blue film 011 to effectively heat the blue film 011.

[0037] It is worth noting that the number of heating plates can be one or more, arranged reasonably on one or both sides of the blue film 011.

[0038] In one specific embodiment, the control element includes an electrical control element or an electromagnetic induction control element to effectively control the heating element.

[0039] In one embodiment, the length of the heating element is 10mm to 2000mm.

[0040] It should be noted that the length of the heating element is related to the heating length of the blue film 011. Sufficient heating length can ensure that the temperature of the blue film 011 rises to the preset temperature, and the temperature of the blue film 011 will not drop rapidly before the film is applied.

[0041] As an example, the peeling force of the blue film 011 increases after heating. The peeling force reaches its maximum when the temperature of the blue film 011 is 60°C, which allows it to be pasted more smoothly onto the surface of the battery 02 without producing wrinkles or bubbles.

[0042] When setting the specific length of the heating element, the length of the heating element can be set to one of the following lengths.

[0043] 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 950 mm, 1000mm, 1050mm, 1100mm, 1150mm, 1200mm, 1250mm, 1300mm, 1350mm, 1400mm, 1450mm, 15 00mm, 1550mm, 1600mm, 1650mm, 1700mm, 1750mm, 1800mm, 1850mm, 1900mm, 1950mm, 20000mm.

[0044] In one embodiment, please refer to... Figure 1 The structure shown has multiple support rollers 300, which are spaced apart; some heating components 400 are placed between adjacent support rollers 300.

[0045] As an example, such as Figure 1 As shown, there are three support rollers 300, spaced apart. A heating element is located between the second and third support rollers 300, and also between the third support roller 300 and the film-pulling roller 200. It should be understood that, taking a heating plate as an example, the length of the heating plate located between the second and third support rollers 300 may be the same as or different from the length of the heating plate located between the third support roller 300 and the film-pulling roller 200.

[0046] In addition, a heating element can be provided between the first support roller 300 and the second support roller 300, which will not be described in detail here.

[0047] When specifically setting the support roller 300, the support roller 300 can be a smooth metal cylinder, and the material can be a chromium-nickel plated alloy, to be fixed on the laminating machine. It should be noted that the blue film 011 is usually quite thin, only about 100μm. When the battery 02 is laminated, the blue film 011 is tightly attached to the surface of the support roller 300. By improving the smoothness of the surface of the support roller 300, damage to the blue film 011 can be avoided, thus ensuring the appearance of the blue film 011.

[0048] In one embodiment, please refer to... Figure 1 As shown in the diagram, the battery film applicator provided in this embodiment further includes a correction component 500 for correcting the position of the blue film 011. This correction component 500 is disposed between the film-laying roller 100 and the support roller 300. The correction component 500 can correct the position of the blue film 011 within the battery film applicator, ensuring that the blue film 011 is applied to the appropriate position on the battery 02 without misalignment, thereby further improving the first-pass yield of the blue film 011.

[0049] In one embodiment, please refer to... Figure 1 The structure shown includes a first roller 610 and a second roller 620. The first roller 610 and the second roller 620 are spaced apart, and the gap between the first roller 610 and the second roller 620 forms an attachment space to attach a blue film 011 to the surface of the battery 02.

[0050] It should be noted that the first roller 610 is used to correspond to one large surface of the battery 02, and the second roller 620 is used to correspond to the other large surface of the battery 02. By using the film-applying device provided in this application embodiment, the first roller 610 and the second roller 620 cooperate with each other to attach the blue film 011 to at least the two large surfaces of the battery 02.

[0051] In one specific embodiment, at least one of the first roller 610 and the second roller 620 may be a metal rod with a rubber layer on its surface. It is understood that the rubber layer has a certain deformation to ensure that the blue film 011 adheres tightly to the battery 02 without gaps during application, thus reducing air bubbles.

[0052] In one embodiment, please refer to... Figure 1 The structure shown in this application embodiment of the battery film applicator further includes a moving component ( Figure 1 (Not shown in the image), the moving component is located on the side of the blue film 011 away from the film-applying roller 600, so as to drive the battery 02 to push the blue film 011 into the application space.

[0053] It should be noted that the movable component can improve the automation level of the battery film application device provided in this application embodiment, thereby reducing the difficulty of applying film to battery 02 and improving the yield and efficiency of one application.

[0054] In one embodiment, the film feeding roller 100 includes an air shaft, the blue film roll 01 is placed on the surface of the air shaft, and the cross-sectional size of the air shaft is adjustable to facilitate the loading and unloading of the blue film roll 01, and to effectively fix the blue film roll 01 to prevent it from shaking.

[0055] In one embodiment, the film-pulling roller 200 includes a metal rod bonded to the free end of the blue film 011.

[0056] It should be noted that the film-pulling roller 200 needs to be attached to the adhesive side of the blue film 011. After dragging the blue film 011 past the support roller 300, it moves downward to make the blue film 011 flat and have a certain tension, so that the blue film 011 is flatly attached to the surface of the battery 02.

[0057] When using the battery film applicator provided in this application embodiment, for example, the heated blue film 011 can be dragged downwards to a set position by the film-pulling roller 200 (the specific position depends on the size of the battery 02, ensuring that the blue film 011 can completely cover the large surface of the battery 02), and then the battery 02 is applied as shown in the image. Figure 1 The middle arrow moves towards the blue film 011 and the film-applying roller 600 until the battery 02 is in close contact with the first roller 610 and the second roller 620 and passes through the gap between them. Then the blue film 011 can be cut, thus completing the film application operation on the large surface of the battery 02.

[0058] It is worth noting that in the battery film applicator provided in this application embodiment, the heating component 400 is used to adjust the temperature of the blue film 011 so that the temperature range of the blue film 011 before application is 40℃~100℃. Considering that the peeling force of the blue film 011 is related to the heating temperature, the influence of temperature on the peeling force of the blue film 011 and the determination of the optimal temperature are now based on specific experiments.

[0059] First, the effect of different temperatures on the peel force of Blue Film 011 was tested. The peel force of Blue Film 011 was characterized by measuring the peel force of Blue Film 011 samples; the same roll of Blue Film 011 of model L173F163A was selected and made into Blue Film 011 peel force test samples (as shown in Table 1). The samples were placed in different environments for 1 hour, and the peel force was measured immediately after the time was up, and the change in peel force was recorded (3 samples for each temperature).

[0060] Table 1. Blue Film 011 Peel Strength Test Samples

[0061]

[0062] Table 1 shows the peel force at different temperatures. Figure 2 As shown, the relationship between peel force and temperature is: y = 1 / E -06 x 4 -0.0003x 3 -0.0071x 2 +3.748x+371.04, from Figure 2 It can be seen that the maximum peeling force occurs at a temperature of 60℃.

[0063] Considering the difficulty of temperature implementation, as an example, the blue film roll 01 can be placed in a high-temperature static room (45±5℃) to improve the peel force of the blue film 011; it was verified that at 45℃ (corresponding to a peel force of about 495N / m), the yield of bubbles and wrinkles in the blue film 011 was reduced.

[0064] It is worth noting that the blue film roll 01 provided in this application embodiment can be placed in a high-temperature resting room at a relatively high temperature for a certain period of time before being applied to the device, so as to reduce the heating difficulty of the heating component 400 to the blue film 011, ensure the adhesion effect of the blue film 011 on the surface of the battery 02, and improve the first-time yield of film application.

[0065] In practical use, the method for achieving the required temperature for the blue film 011 can be confirmed. For example, the temperature changes at the beginning, middle, and core of the blue film roll 01 after being placed in a high-temperature settling chamber can be measured. For instance, three rolls of blue film 011 were placed in a high-temperature settling chamber (45±5℃) for 4 hours, 12 hours, and 24 hours, and the temperature changes were tested using a multi-channel temperature measuring instrument. As shown in Table 2, after 4 hours of high-temperature settling, the end of the roll reached 45℃, while the core only reached 40℃, a temperature difference of 7℃. As shown in Tables 3 and 4, after 12 hours, the core reached 43℃, a temperature difference of 5℃, which is relatively small compared to 24 hours; the baking time for the blue film 011 was set at 12 hours.

[0066] Table 2. Temperature changes of Blue Film 011 after 4 hours in a high-temperature static room.

[0067]

[0068] Table 3. Temperature changes of Blue Film 011 after 12 hours in a high-temperature static room.

[0069]

[0070] Table 4 shows the temperature changes of Blue Film 011 after being placed in a high-temperature static room for 24 hours.

[0071]

[0072] like Figure 3 As shown, a film-applying test was conducted on 7 rolls of blue film 011 stored at 45℃ for 12 hours to confirm the results. Using 7 rolls of blue film 011 that had been left to stand at high temperature for 12 hours for film-applying production, the wrinkle defect rate was about 1.2%, which is about 9% lower than the initial wrinkle rate of 10%, showing a significant effect.

[0073] Accordingly, as an example, the blue film roll 01 can be placed in a high-temperature static room at 45°C for 12 hours before being applied to the battery film application device provided in this application embodiment, so as to reduce the heating difficulty of the heating element and improve the first-time yield of film application.

[0074] In general, regardless of whether the blue film roll 01 is preheated, during the film application process, it is necessary to ensure that the blue film 011 from the beginning, middle and core of the roll 01 has a uniform peel force at the application position.

[0075] Once the blue film roll 01 has been preheated, the heating state of the heating element can be adjusted as needed to ensure that the heating state of the blue film 011 from different positions on the blue film roll 01 varies. For example, the heating power of the heating element can be increased or additional heating elements can be added to improve the heating effect of the heating element on the blue film 011 from the core position, ensuring that the temperature of the blue film 011 reaching the film application position is approximately the same, ensuring uniform temperature and peel force of the blue film 011, thereby improving the first-pass application yield.

[0076] Understandably, the high-temperature settling temperature can be between 30℃ and 100℃, and the high-temperature settling time can be between 2 hours and 48 hours.

[0077] For production line manufacturing, capacity requirements and production cycle time need to be considered, resulting in different maximum heating times for a single piece of blue film 011. For example, the maximum heating time for a single piece of blue film 011 is 9 seconds. In this case, the heating time for blue film 011 can be controlled within 9 seconds. The effect of different heating times on peel force of blue film 011 is shown in Table 5 (measured using a multi-channel temperature measuring instrument).

[0078] Table 5. Relationship between time and peel force for Blue Film 011 during heating process of heating component 400.

[0079]

[0080] According to the relationship between time and peel force of a single blue film 011 in the heating component 400 in Table 5, it can be seen that in order to make the peel force of the blue film roll 01 tail and the core consistent during the winding process, the blue film 011 can be kept in the heating component 400 for a time greater than 4 seconds. Based on the current production capacity requirements, the time is selected as 8 seconds.

[0081] Please combine Figure 1 refer to Figure 4 The structure shown is illustrated. Also, please refer to Table 6 for the effect of the length of the heating component 400 of different lengths on the peel force of the blue film 011 (measured using a multi-channel thermometer).

[0082] During equipment operation, the length of the heating element affects the heating time of the blue film 011. In the test, heating elements of different lengths were selected. The length of the heating element located between the second and third support rollers 300 was designated as A, and the length of the heating element located between the third support roller 300 and the film-pulling roller 200 was designated as B. The initial temperature, and the temperature and peel force of the blue film 011 sheet after heating, were then measured to evaluate the effect of length (A+B) on the residence time. It is worth noting that... Figure 4 The heating elements are distributed on both sides of the blue film 011.

[0083] Table 6. Effect of the length of heating components 400 of different lengths on the peel force of blue film 011.

[0084]

[0085] Considering equipment space and production capacity, the dwell time is related to the length of the heating element. For example, when the maximum dwell time is 9 seconds, the heating element should be at least 1000mm long; the longer the element, the higher the temperature. In a specific example, based on the actual equipment layout, the total length of the heating device is selected as 1200mm.

[0086] Next, as shown in Table 7, the relationship between temperature and peel force after different retention times under different temperature conditions was measured (using a multi-channel thermometer):

[0087] Table 7. Relationship between temperature and peel force after different retention times under different temperature conditions.

[0088]

[0089] Please refer to Table 7 and... Figure 4 Based on the relationship between time and peel force of a single blue film 011 at different heating temperatures, it can be seen that the heating effect at 60℃ is not much different from that at 45℃. Considering energy, the temperature is set at 45℃. The blue film 011 on the production line is placed in a high-temperature static room at 45℃ for 12 hours before being applied on the improved equipment. The change in the film application yield is then monitored.

[0090] Before any improvements were made, the first-time yield of film application was around 90%. After the blue film roll 01 was subjected to a high-temperature static treatment at 45℃ for 12 hours, the first-time yield of film application stabilized at around 98.3%. After improvements were made to the film application equipment, the residence time of the blue film 011 was 8 seconds, and the first-time yield of film application stabilized at around 99.98%, showing a significant improvement.

[0091] Conclusion: Based on the improvement effect of the first-pass yield of film application, heating the blue film roll 01 at 45℃ for 12 hours and then applying it on the improved film application equipment, with a residence time of 8 seconds in the heating equipment, significantly improved the first-pass yield of film application.

[0092] Secondly, embodiments of this application provide a film applicator. This film applicator includes the battery film applicator provided by any of the technical solutions in the first aspect described above.

[0093] It should be noted that in the film applicator provided in this application embodiment, the battery film applicator heats the blue film 011 through the heating component 400 and then applies the heated blue film 011 to the surface of the battery 02. This hot-applied film method makes it easier for the tension of the blue film 011 to be released after it is applied to the surface of the battery 02, making it less likely to form stress accumulation, and making it easier for the blue film 011 to be applied smoothly to the surface of the battery 02.

[0094] Therefore, in the film applicator provided in this application embodiment, the battery film applicator uses a heated film applicator during the film applicator process to reduce the proportion of bubbles / wrinkles appearing on the blue film 011 located on the large surface or side of the battery 02 during the film applicator process, thereby reducing the proportion of film tearing and rework, reducing the difficulty of film applicator and production cost, and improving the yield and efficiency of film applicator in one application.

[0095] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the inventive creation disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered illustrative only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0096] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery film attaching device characterized by comprising: include: A film-feeding roller, used to hold blue film rolls; A film-pulling roller, used to pull the free end of the blue film unrolled from the blue film roll; A support roller is provided between the film feeding roller and the film pulling roller to tension the blue film located between the film feeding roller and the film pulling roller; A heating assembly, at least a portion of which is disposed between the support roller and the film pulling roller and located on at least one side of the blue film, is used to heat the blue film and control the temperature range of the blue film to be 40°C to 100°C; A film-applying roller, located between the heating assembly and the film-pulling roller, is used to apply the heated blue film to the surface of the battery.

2. The battery film attaching device according to claim 1, wherein The heating assembly includes a heating element and a control element, wherein the control element is connected to the heating element to control the heating element to heat the blue film.

3. The battery film attaching device according to claim 2, wherein The heating element includes a heating plate or a heating box; And / or, the control element includes an electrical control element or an electromagnetic induction control element.

4. The battery film attaching device according to claim 2, wherein The length of the heating element is 10mm to 2000mm.

5. The battery film application device of any one of claims 1-4, wherein, The number of support rollers is multiple, and the multiple support rollers are arranged at intervals; some of the heating components are placed between adjacent support rollers.

6. The battery film application device of any one of claims 1-4, wherein, It also includes a correction component for correcting the position of the blue film, the correction component being disposed between the film feeding roller and the support roller.

7. The battery film application device of any one of claims 1-4, wherein, The film-applying roller includes a first roller body and a second roller body, the first roller body and the second roller body are spaced apart, and the gap between the first roller body and the second roller body forms an adhesion space to apply the blue film to the surface of the battery.

8. The battery film application device of claim 7, wherein, At least one of the first roller and the second roller includes a metal rod and a rubber layer covering the surface of the metal rod.

9. The battery film application device of claim 7, wherein, It also includes a moving component located on the side of the blue film away from the film-applying roller, so as to drive the battery to push the blue film into the application space.

10. The battery film application device of any one of claims 1-4, wherein, The film-releasing roller includes an air-expanding shaft, the blue film roll is placed on the surface of the air-expanding shaft, and the cross-sectional dimensions of the air-expanding shaft are adjustable.

11. The battery film application device of any one of claims 1-4, wherein, The film-pulling roller includes a metal rod, which is bonded to the free end of the blue film.

12. A film sticking machine, characterized in that, Includes the battery film application device as described in any one of claims 1-11.

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