Process for coating insulating film on single surface of large side plate of battery

Abstract

The invention provides a process for coating a single surface of a large side plate of a battery with an insulating film. According to the process, through the ingenious design of the laminating and laminating jig, the high-efficiency and accurate positioning and laminating of the insulating film of the large side plate of the battery are realized, and the complexity and time consumption of manual operation are greatly reduced, so that the production efficiency is remarkably improved. A first positioning block, a second positioning block and a corresponding positioning groove are designed in the jig. According to the invention, the accurate alignment of each layer of insulating film and Teflon film in the laminating process is ensured, and the quality problems of foaming, wrinkling and the like of the insulating film caused by position deviation are effectively avoided. Generally speaking, the process provided by the invention not only improves the production efficiency, but also remarkably improves the product quality, and brings important technical innovation and practical value for the film coating process of the insulating film of the large side plate of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery side coating, and in particular to a process for coating a single side insulating film on a large battery side plate. Background Art

[0002] In the field of battery manufacturing, especially for battery modules with large side panels, the covering of insulating film is a key step, which directly affects the safety and performance of the battery. The traditional insulating film covering process often has problems such as inaccurate positioning, uneven covering and low production efficiency. In order to solve these problems, the industry has been exploring more accurate and efficient insulating film covering technology.

[0003] In recent years, with the continuous development of battery technology and the increasing attention paid to battery safety performance, the requirements for the insulation film covering process have become increasingly higher. It is necessary not only to ensure that the insulation film can be firmly covered on the large side plate of the battery, but also to ensure the accuracy and consistency of the covering process to avoid battery failure or safety accidents caused by improper covering. Summary of the invention

[0004] The purpose of this application is to provide a novel process for single-sided insulation film coating of large side plates of batteries, so as to achieve precise coverage of the insulation film, improve production efficiency and the overall performance of the battery.

[0005] In order to achieve the above objectives, this application provides the following technical solutions: A process for coating a single side insulating film of a battery large side plate, comprising a laminated coating jig, the laminated coating jig comprising an upper template and a lower template, the upper surface of the lower template is provided with a first positioning block and a second positioning block; the upper template is provided with a first positioning groove and a second positioning groove corresponding to the first positioning block and the second positioning block; The process of single-sided insulation film coating of the battery large side plate includes the following steps: S1. Place the insulating film on the lower surface of the side plate, and ensure that the extended portion of the insulating film extends out of both sides of the side plate; S2. Place a release paper between the ear portion of the insulating film and the lower surface of the side plate; S3, fold the extended part of the insulating film upward to the upper surface of the side plate and scrape it flat; S4, placing the side panel on the lower template, and positioning the four sides by the first positioning block and the second positioning block; S5, placing a first Teflon film between the extended portions of the insulating film; S6, placing at least two second Teflon films on the upper surface of the first Teflon film, the area of ​​the second Teflon film being the same as that of the side plate; S7, repeating the above steps S1 to S6 to form a multi-layer stacking structure; S8. After forming a multi-layer stacking structure, the upper template and the lower template are placed in a hot press together for heating; after the heating is completed, the hot press drives the upper template to cooperate with the first positioning groove and the second positioning groove on the lower template to press down the stacking structure to complete the coating of the insulating film of the side plate.

[0006] Furthermore, the distance between the side edge of the first Teflon film and the side edge of the insulating film extension portion is less than 2 mm.

[0007] Furthermore, the thickness of the first Teflon film is the same as the thickness of the insulating film.

[0008] Furthermore, the thickness of the first Teflon film is the same as the thickness of the second Teflon film.

[0009] The beneficial effects of this application are: (1) This application achieves efficient and precise positioning and lamination of the insulating film of the large side plate of the battery through the design of a laminating jig, reduces the complexity and time consumption of manual operation, and thus significantly improves production efficiency.

[0010] (2) The first positioning block, the second positioning block and the corresponding positioning groove design in the lamination jig of the present application ensure the accurate alignment of each layer of insulating film and Teflon film during the lamination process, reducing quality problems such as bubbling and wrinkling of the insulating film caused by position offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of a laminated film fixture provided in one embodiment of the present application; Figure 2 This is a schematic diagram of step S1 in the process of coating the large side plate of the battery with an insulating film on one side of the battery in the present application; Figure 3 This is a schematic diagram of step S2 in the process of coating the large side plate of the battery with an insulating film on one side of the battery in the present application; Figure 4 This is a schematic diagram of step S3 in the process of coating the large side plate of the battery with an insulating film on one side of the battery in the present application; Figure 5 This is a schematic diagram of step S5 in the process of coating the large side plate of the battery with an insulating film on one side of the battery in the present application; Figure 6 This is a schematic diagram of step S6 in the process of coating the large side plate of the battery with an insulating film on one side of the battery in the present application; Figure 7 This is a schematic diagram of step S7 in the process of coating the large side plate of the battery with an insulating film on one side of the battery in the present application; Figure 8 This is an enlarged schematic diagram of the distance between the side edge of the first Teflon film and the side of the insulating film extension portion in the process of single-sided coating of the insulating film on the large side plate of the battery of the present application; Description of reference numerals: 100, side plate; 200, insulation film; 300, release paper; 400, first Teflon film; 500, second Teflon film; 210, ear portion; 220, extension portion; 1. Laminating film jig; 11. Upper template; 12. Lower template; 13. First positioning block; 14. Second positioning block; DETAILED DESCRIPTION

[0012] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0013] A process for coating a large battery side plate 100 with an insulating film 200 on one side is provided. The process achieves accurate and efficient coating of the large battery side plate 100 with an insulating film 200 on one side with the aid of a laminated coating jig 1. The process steps range from the initial placement of the insulating film 200 to the final hot pressing coating, and each step is intended to ensure uniform coating of the insulating film 200 and precise positioning of the side plate 100.

[0014] like Figure 1 As shown, the laminating jig 1 comprises an upper template 11 and a lower template 12, and the upper surface of the lower template 12 is provided with a first positioning block 13 and a second positioning block 14; the upper template 11 is provided with a first positioning groove and a second positioning groove corresponding to the first positioning block 13 and the second positioning block 14; The process of coating the battery large side plate 100 with an insulating film 200 on one side includes the following steps: like Figure 2 As shown, S1, place the insulating film 200 flatly on the lower surface of the side plate 100, ensuring that the insulating film 200 has no wrinkles or bubbles. At the same time, use a ruler or positioning tool to accurately control the length of the extension 220 of the insulating film 200 extending from both sides of the side plate 100 to ensure the smooth progress of subsequent steps; like Figure 3 As shown, S2, carefully insert the isolation paper 300 between the ear portion 210 of the insulating film 200 and the lower surface of the side plate 100 to prevent the insulating film 200 and the side plate 100 from sticking together during the heating process; like Figure 4 As shown, S3, gently fold the extension 220 of the insulating film 200 upward to the upper surface of the side plate 100, and use a scraper or similar tool to flatten the insulating film 200 to remove bubbles and wrinkles that may be generated; the main function of the insulating film is to provide electrical isolation to prevent current from flowing between different components. Folding the extension of the insulating film to the upper surface of the side plate can ensure complete isolation between the side plate and adjacent components and reduce the risk of short circuit.

[0015] S4. Carefully place the side plate 100 with the insulating film 200 on the lower template 12, and position the four sides of the side plate 100 using the first positioning block 13 and the second positioning block 14 on the lower template 12. During the positioning process, ensure that the side plate 100 is in close contact with the positioning blocks without shaking; like Figure 5 As shown, S5, the first Teflon film 400 is accurately placed between the extensions 220 of the insulating film 200; the Teflon film can form a smooth transition layer between the insulating films due to its special physical and chemical properties. This helps to ensure that the upper insulating film can be evenly and tightly attached to the lower structure during the subsequent lamination process, avoiding the generation of defects such as bubbles and wrinkles.

[0016] like Figure 6 As shown, S6, at least two second Teflon films 500 are placed on the upper surface of the first Teflon film 400, and the area of ​​the second Teflon film 500 is the same as that of the side plate 100; the Teflon film has high wear resistance, and multi-layer stacking can further enhance this property. In application scenarios that need to withstand mechanical wear or frequent operation, multi-layer Teflon films can extend the service life of the product.

[0017] like Figure 7 As shown, S7, repeating steps S1 to S6 to form a desired multi-layer stacked structure; S8, putting the upper template 11 and the lower template 12 into a hot press for heating. The heating temperature and time should be set according to the material properties of the insulating film 200 and the Teflon film. After the heating is completed, the hot press drives the upper template 11 to press down, and cooperates with the positioning groove on the lower template 12 to accurately press down the stacked structure to complete the insulation film 200 coating of the side plate 100.

[0018] like Figure 8 As shown, in this embodiment, the distance H between the side of the first Teflon film 400 and the side of the extension portion 220 of the insulating film 200 is less than 2 mm.

[0019] In this embodiment, the distance between the side of the first Teflon film 400 and the side of the extension portion 220 of the insulating film 200 is strictly controlled to be less than 2 mm. The main purpose of this design is to prevent the upper insulating film 200 from lacking sufficient support during the lamination process due to the excessive distance, thereby preventing bubbling.

[0020] When the distance between the side of the first Teflon film 400 and the side of the extension 220 of the insulating film 200 is too large, the upper insulating film 200 may not be adequately supported during the lamination process. Lack of support can cause the insulating film 200 to deform easily when heated or pressed, especially when the material is subjected to uneven pressure or heat distribution.

[0021] An excessively large spacing provides space for gas (such as air) to be trapped. During the lamination process, if gas is trapped between the insulating film 200 and the underlying material, the gas will expand and form bubbles as the temperature and pressure change.

[0022] The optimal spacing H between the side of the first Teflon film 400 and the side of the extension 220 of the insulating film 200 is 1 mm. When the spacing is too large, the upper insulating film 200 may be deformed and form bubbles during the lamination process due to lack of sufficient support. Setting the spacing to 1 mm can effectively avoid this problem and ensure that the insulating film 200 can be evenly supported when heated and pressed.

[0023] In this embodiment, the thickness of the first Teflon film 400 is the same as that of the insulating film 200. When the thickness of the Teflon film and the insulating film 200 is the same, they can form a uniform support layer on the battery large side plate 100. This helps to reduce local stress concentration or unevenness caused by thickness differences, thereby ensuring the flatness of the entire insulating layer.

[0024] In this embodiment, the thickness of the first Teflon film 400 is the same as the thickness of the second Teflon film 500. When the thickness of the two Teflon films is the same, their coverage on the large side plate 100 of the battery can maintain consistent flatness, avoiding local protrusions or depressions caused by thickness differences.

[0025] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] In the embodiments of the present application, the devices or elements referred to or implied must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise precisely and specifically specified.

[0027] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "may include" and "have" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application are described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A process for coating a single side insulating film on a large side plate of a battery, characterized in that: The laminated film jig includes an upper template and a lower template, the upper surface of the lower template is provided with a first positioning block and a second positioning block; the upper template is provided with a first positioning groove and a second positioning groove corresponding to the first positioning block and the second positioning block; The process of single-sided insulation film coating of the battery large side plate includes the following steps: S1. Place the insulating film on the lower surface of the side plate, and ensure that the extended portion of the insulating film extends out of both sides of the side plate; S2. Place a release paper between the ear portion of the insulating film and the lower surface of the side plate; S3, fold the extended part of the insulating film upward to the upper surface of the side plate and scrape it flat; S4, placing the side panel on the lower template, and positioning the four sides by the first positioning block and the second positioning block; S5, placing a first Teflon film between the extended portions of the insulating film; S6, placing at least two second Teflon films on the upper surface of the first Teflon film, the area of ​​the second Teflon film being the same as that of the side plate; S7, repeating the above steps S1 to S6 to form a multi-layer stacking structure; S8. After forming a multi-layer stacking structure, the upper template and the lower template are placed in a hot press together for heating; after the heating is completed, the hot press drives the upper template to cooperate with the first positioning groove and the second positioning groove on the lower template to press down the stacking structure to complete the coating of the insulating film of the side plate.

2. A process for coating a single-sided insulating film on a large side plate of a battery according to claim 1, characterized in that: The distance between the side edge of the first Teflon film and the side edge of the insulating film extension portion is less than 2 mm.

3. A process for coating a single-sided insulating film on a large side plate of a battery according to claim 1, characterized in that: The thickness of the first Teflon film is the same as the thickness of the insulating film.

4. A process for coating a single-sided insulating film on a large side plate of a battery according to claim 1, characterized in that: The thickness of the first Teflon film is the same as the thickness of the second Teflon film.

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