CN119283371A

CN119283371A - A process for coating a single-sided insulating film on a large side plate of a battery

Info

Publication number: CN119283371A
Application number: CN202411154247.9A
Authority: CN
Inventors: 朱欢; 黄福林; 曾伟; 蔡建波
Original assignee: Guangdong Shenglan New Energy Technology Co ltd
Current assignee: Guangdong Shenglan New Energy Technology Co ltd
Priority date: 2024-08-22
Filing date: 2024-08-22
Publication date: 2025-01-10

Abstract

The present application proposes a process for single-sided coating of insulating film on large side panels of batteries. This process achieves efficient and precise positioning and lamination of insulating films on large side panels of batteries through the ingenious design of the laminating jig, greatly reducing the complexity and time consumption of manual operations, thereby significantly improving production efficiency. The first positioning block, the second positioning block and the corresponding positioning groove design in the jig. They ensure the accurate alignment of each layer of insulating film and Teflon film during the lamination process, and effectively avoid quality problems such as bubbling and wrinkling of the insulating film caused by position offset. Overall, the process of the present application not only improves production efficiency, but also significantly improves product quality, bringing important technical innovation and practical value to the coating process of insulating films on large side panels of batteries.

Description

Technology for covering insulating film on single side of large side plate of battery

Technical Field

The application relates to the field of battery side part coating, in particular to a process for coating an insulating film on one side of a large side plate of a battery.

Background

In the field of battery manufacturing, particularly for large-sided battery modules, the covering of the insulating film is a critical step that directly affects the safety and performance of the battery. The traditional insulating film covering process often has the problems of inaccurate positioning, uneven covering, low production efficiency and the like. To solve these problems, the industry is searching for more accurate and efficient insulating film covering techniques.

In recent years, with the continuous development of battery technology and increasing importance on battery safety performance, the requirements on the insulating film covering process are also increasing. Not only is it necessary to ensure that the insulating film can be firmly covered on the large side plate of the battery, but also accuracy and consistency in the covering process are required to be ensured so as to avoid battery failure or safety accidents caused by improper covering.

Disclosure of Invention

The application aims to provide a novel process for covering an insulating film on one side of a large side plate of a battery so as to realize accurate coverage of the insulating film and improve the production efficiency and the overall performance of the battery.

In order to achieve the above object, the present application provides the following technical solutions:

The single-sided insulating film coating process for the large side plate of the battery comprises a laminated film coating jig, wherein the laminated film coating jig comprises an upper template and a lower template, and a first positioning block and a second positioning block are arranged on the upper surface of the lower template;

The process for covering the insulating film on one side of the large side plate of the battery comprises the following steps:

S1, placing an insulating film on the lower surface of a side plate, and ensuring that the extending part of the insulating film extends out of two sides of the side plate;

s2, placing a piece of isolation paper between the ear part of the insulating film and the lower surface of the side plate;

s3, upwards turning over the extension part of the insulating film to the upper surface of the side plate, and scraping off;

S4, placing the side plates on the lower die plate, and performing four-side positioning through the first positioning block and the second positioning block;

s5, placing a first Teflon film between the extending parts of the insulating films;

S6, placing at least 2 pieces of second Teflon films on the upper surface of the first Teflon film, wherein the area of the second Teflon film is the same as that of the side plate;

S7, repeatedly executing the steps S1 to S6 to form a multi-layer laminated structure;

And S8, after the multi-layer laminated structure is formed, the upper template and the lower template are put into a hot press together for heating, and after the heating is finished, the hot press drives the upper template to be matched with the first positioning groove and the second positioning groove on the lower template, and the laminated structure is pressed down to finish the film coating of the insulating film of the side plate.

Further, a spacing between the side of the first teflon film and the side of the insulating film extension is less than 2mm.

Further, the thickness of the first teflon film is the same as the thickness of the insulating film.

Further, the thickness of the first teflon film is the same as the thickness of the second teflon film.

The beneficial effects of the application are as follows:

(1) According to the application, through the design of the lamination film jig, the high-efficiency and accurate positioning and lamination of the insulating film of the large side plate of the battery are realized, and the complexity and time consumption of manual operation are reduced, so that the production efficiency is remarkably improved.

(2) The first positioning block, the second positioning block and the corresponding positioning groove in the laminated film jig ensure the accurate alignment of each layer of insulating film and the Teflon film in the lamination process, and reduce the quality problems of foaming, wrinkling and the like of the insulating film caused by position deviation.

Drawings

Fig. 1 is a schematic structural diagram of a laminating jig according to an embodiment of the application;

FIG. 2 is a schematic diagram of step S1 in the process of covering an insulating film on one side of a large side plate of a battery according to the present application;

FIG. 3 is a schematic diagram of step S2 in the process of covering an insulating film on one side of a large side plate of a battery according to the present application;

FIG. 4 is a schematic diagram of step S3 in the process of covering an insulating film on one side of a large side plate of a battery according to the present application;

FIG. 5 is a schematic diagram of step S5 in the process of covering an insulating film on one side of a large side plate of a battery according to the present application;

FIG. 6 is a schematic diagram of step S6 in the process of covering an insulating film on one side of a large side plate of a battery according to the present application;

FIG. 7 is a schematic diagram of step S7 in the process of covering an insulating film on one side of a large side plate of a battery according to the present application;

Fig. 8 is an enlarged schematic view of the spacing between the side edge of the first teflon film and the side portion of the extension of the insulating film in the process of single-sided insulating film coating of the large side plate of the battery of the present application;

reference numerals illustrate:

100. Side plates, 200 parts of insulating films, 300 parts of isolating paper, 400 parts of first Teflon films, 500 parts of second Teflon films;

210. 220, an extension;

1. the laminating jig comprises an upper template, a lower template, a first positioning block, a second positioning block and a first positioning block, wherein the upper template is provided with a first positioning block and the lower template is provided with a second positioning block;

Detailed Description

The terminology used in the description of the embodiments of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application, as will be described in detail with reference to the accompanying drawings.

The process realizes accurate and efficient coverage of the single-sided insulating film 200 of the large side plate 100 of the battery by the assistance of the laminated film jig 1. The process steps range from initial placement of the insulating film 200 to final hot-press lamination, each of which is intended to ensure uniform coverage of the insulating film 200 and accurate positioning of the side plates 100.

As shown in fig. 1, the laminating jig 1 comprises an upper template 11 and a lower template 12, wherein a first positioning block 13 and a second positioning block 14 are arranged on the upper surface of the lower template 12, and a first positioning groove and a second positioning groove are arranged on the upper template 11 corresponding to the first positioning block 13 and the second positioning block 14;

the process for covering the insulating film 200 on one side of the large side plate 100 of the battery comprises the following steps:

As shown in fig. 2, S1, the insulating film 200 is placed flat on the lower surface of the side plate 100, ensuring that the insulating film 200 is wrinkle-free and bubble-free. Meanwhile, the length of the extension 220 of the insulating film 200 extending out of both sides of the side plate 100 is precisely controlled by using a scale or a positioning tool to ensure the smooth proceeding of the subsequent steps;

as shown in fig. 3, S2, a release paper 300 is carefully placed 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 from sticking to the side plate 100 during heating;

As shown in fig. 4, S3, the extension 220 of the insulating film 200 is gently folded up to the upper surface of the side plate 100, and the insulating film 200 is scraped flat using a scraper or the like to remove bubbles and wrinkles that may be generated, and the main function of the insulating film is to provide electrical isolation to prevent current from flowing between different components. The extending part of the insulating film is folded to the upper surface of the side plate, so that complete isolation between the side plate and the adjacent part can be ensured, and the short circuit risk is reduced.

S4, carefully placing the side plate 100 with the insulating film 200 placed on the lower die plate 12, and positioning the side plate 100 four sides by the first positioning block 13 and the second positioning block 14 on the lower die plate 12. In the positioning process, the side plate 100 is ensured to be in close contact with the positioning block, and no shaking exists;

As shown in fig. 5, S5, a first teflon film 400 is accurately placed between the extensions 220 of the insulating film 200, and a smooth transition layer may be formed between the insulating films due to its special physical and chemical properties. This helps in the follow-up tectorial membrane in-process, ensures that upper insulating film can evenly, closely laminate on the lower floor structure, avoids bubble, the defect such as fold to produce.

As shown in fig. 6, at least 2 second teflon films 500 are placed on the upper surface of the first teflon film 400, the second teflon films 500 having the same area as the side plate 100, and the teflon films having high abrasion resistance, and the multi-layered stack can further enhance this characteristic. In application scenarios where mechanical wear or frequent handling is required, multilayer teflon films can extend the service life of the product.

As shown in fig. 7, S7, steps S1 to S6 are repeatedly performed to form a desired multilayer laminated structure;

S8, placing the upper template 11 and the lower template 12 into a hot press together for heating. The heating temperature and time should be set according to the material characteristics of the insulating film 200 and the teflon film. After the heating is completed, the upper die plate 11 is driven to press down by the hot press, and the stacked structure is precisely pressed down by matching with the positioning groove on the lower die plate 12, so that the insulating film 200 of the side plate 100 is coated.

As shown in fig. 8, in the present embodiment, the distance H between the side of the first teflon film 400 and the side of the extension 220 of the insulating film 200 is less than 2mm.

In the present embodiment, the spacing between the side of the first teflon film 400 and the side of the extension 220 of the insulating film 200 is strictly controlled to be less than 2mm, and the main purpose of this design is to prevent the upper insulating film 200 from being lack of sufficient support due to the excessive spacing during the film coating process, thereby generating a foaming phenomenon.

When the interval between the side of the first teflon film 400 and the side of the extension 220 of the insulating film 200 is excessively large, the upper insulating film 200 may not be sufficiently supported during the film coating process. The lack of support can result in the insulating film 200 being susceptible to deformation when heated or pressed, particularly when the material is subjected to uneven pressure or heat distribution.

The excessive spacing provides trapped space for gas (e.g., air) that expands and forms bubbles as a function of temperature and pressure if trapped between the insulating film 200 and underlying material during the lamination process.

The spacing H between the side of the first teflon film 400 and the side of the extension 220 of the insulating film 200 is optimally 1mm. When the pitch is too large, the upper insulating film 200 may be deformed during the film coating process due to lack of sufficient support, forming bubbles. Setting the pitch to 1mm can effectively avoid this problem, ensuring that the insulating film 200 can be uniformly supported when heated and pressed.

In this embodiment, the thickness of the first teflon film 400 is the same as that of the insulating film 200. When the teflon films and the insulating films 200 have the same thickness, their coverage on the large battery side plates 100 can form a uniform support layer. This helps to reduce local stress concentration or unevenness due to thickness differences, thereby ensuring flatness of the entire insulating layer.

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 battery side plate 100 can maintain uniform flatness, avoiding local protrusions or depressions due to the thickness difference.

In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly coupled, indirectly coupled through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The embodiments of the application may be implemented or realized in any number of ways, including as a matter of course, such that the apparatus or elements recited in the claims are not necessarily oriented or configured to operate in any particular manner. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more unless specifically stated otherwise.

The terms first, second, third, fourth and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "may include" and "have," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the embodiments of the present application, and are not limiting. Although embodiments of the present application have been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the present application may be modified in light of the above-described embodiments, or equivalents may be substituted for some or all of the features thereof. Such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The single-sided insulating film coating process for the large side plate of the battery is characterized by comprising a laminated film coating jig, wherein the laminated film coating jig comprises an upper template and a lower template, and a first positioning block and a second positioning block are arranged on the upper surface of the lower template;

2. The process for single-sided insulation film coating of a large side plate of a battery according to claim 1, wherein a distance between a side edge of the first Teflon film and a side part of the extension part of the insulation film is smaller than 2mm.

3. The process for single-sided insulation film coating of a large side plate of a battery according to claim 1, wherein the thickness of the first Teflon film is the same as that of the insulation film.

4. The process for single-sided insulation film coating of a large side plate of a battery according to claim 1, wherein the thickness of the first Teflon film is the same as that of the second Teflon film.