Mylar membrane and battery
By setting up self-locking and self-locking holes on the Mylar film, the interlocking and gap formation of the membrane body are achieved, the side rebound and electrostatic adsorption problems during welding and stacking are solved, and the quality of battery assembly and the efficiency of manipulator operation is improved.
Patent Information
- Application Number
- CN202323443362.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-18
AI Technical Summary
During the production process of sodium battery square aluminum shell batteries, ordinary Mylar films are prone to side folds and rebounds due to their own elasticity during welding and stacking, and the mutual adsorption of static electricity makes it difficult for the robot to grasp separately, resulting in poor glue patching and multiple pieces of scratching at the same time. phenomenon.
A Mylar film consisting of the bottom, large and side-side coating film is designed. By providing self-locking and self-locking holes on the side-side coating film, it is interlocked to avoid side rebound and wrinkles and form when stacked. gap to reduce electrostatic adsorption.
The Mylar film and battery cell are achieved in close fit, avoiding side wrinkles and rebounds during welding, and reducing the possibility of the robot grabbing multiple pieces when taking materials, improving the adhesive quality and operating efficiency.
Smart Images
Figure CN222168529U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a Mylar film and a battery. Background Art
[0002] In the production process of sodium battery square aluminum shell batteries, the battery cells need to be wrapped with Mylar film before they are put into the shell to prevent the battery cells from being scrapped due to protrusions, burrs, foreign objects, etc. at the shell opening or inside. Ordinary Mylar film is a flat structure, which has the following disadvantages:
[0003] 1. When welding the Mylar film, it is necessary to use a clamping mechanism to press the Mylar film for hot-melt welding. The Mylar film is welded to the battery top cover. After welding, due to the small number of welding points on the side, wrinkles are easily generated on the top and bottom of the side of the Mylar film. After the clamping mechanism is released, the Mylar film will rebound due to its own elasticity at the bottom crease, which may cause poor gluing in the next step of gluing the tail.
[0004] 2. Mylar film comes in a whole package, and static electricity will be generated between each piece, causing the robot to easily grab multiple pieces of Mylar film at the same time. Utility Model Content
[0005] One of the purposes of the utility model is to provide a Mylar film, which can avoid side rebound and wrinkles caused by the elastic force of the Mylar film itself during welding, and can form gaps when stacked to reduce the possibility of a robot arm grabbing multiple Mylar films at the same time.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] The Mylar film comprises a film body, wherein the film body further comprises a bottom covering film, a large covering film and a side covering film, wherein the bottom edges of two large covering films are respectively connected to the two long edges of the bottom covering film, and the two side edges of the large covering film are respectively connected to the two side covering films, and one of the two side covering films located on the same side of the two large covering films is provided with a self-locking hole, and the other is provided with a self-locking buckle, and the self-locking buckle can be inserted into the self-locking hole and locked with the self-locking hole.
[0008] Preferably, the self-locking buckle comprises a cylinder and a cone, one end of the cylinder is connected to the side covering film, and the other end is connected to the cone, and the radius of the cone gradually decreases from the end connected to the cylinder to the end away from the cylinder.
[0009] Preferably, the height of the column is greater than the thickness of the side coating film.
[0010] Preferably, the sum of the widths of the two side covering films located on the same side of the two large covering films is greater than the width of the battery cell to be covered.
[0011] Preferably, the large covering film is divided into a first large covering film and a second large covering film, the width of the two side covering films connected by the first large covering film is greater than the width of the two side covering films connected by the second large covering film, and the self-locking hole is arranged on the side of the side covering film connected to the first large covering film away from the first large covering film.
[0012] Preferably, the width of the two side covering films connected to the first large covering film is the same as the width of the battery cell, and the width of the two side covering films connected to the second large covering film is half the width of the battery cell.
[0013] Preferably, the self-locking holes are arranged in a plurality of rows on the side covering film along the width direction of the side covering film, and a plurality of self-locking holes are arranged in each row along the length direction of the side covering film.
[0014] Preferably, the self-locking holes are arranged on both sides of the side covering film in the length direction.
[0015] Preferably, a first folding line is provided between the large covering film and the bottom covering film, and a second folding line is provided between the large covering film and the side covering film.
[0016] Another object of the present utility model is to provide a battery, comprising a battery cell composed of a plurality of battery cells and any of the Mylar films described above, wherein the sides of the battery cells are rounded, the Mylar film is wrapped around the plurality of battery cells, and the self-locking buckle faces the battery cells and is directly opposite to the rounded corners of the battery cells.
[0017] The beneficial effects of the utility model are as follows: the Mylar film is interlocked with the two side covering films of the Mylar film through the arrangement of the self-locking buckle and the self-locking hole. In the interlocking state, the Mylar film can fit tightly with the battery cell. The Mylar film will not wrinkle or melt off due to its own elasticity. In addition, due to the arrangement of the self-locking buckle, there is a certain gap between the stacked Mylar films, which can greatly reduce the static electricity generated, thereby reducing the possibility of the robot arm performing the grasping operation grasping multiple sheets at one time when picking up materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic structural diagram of a Mylar film in an unfolded state in an embodiment of the utility model;
[0019] Figure 2It is a schematic diagram of the structure of the Mylar film in a folded state in an embodiment of the utility model;
[0020] Figure 3 It is a schematic diagram of the structure in which the self-locking buckle and the self-locking hole are interlocked in the embodiment of the utility model;
[0021] Figure 4 It is a partial structural schematic diagram of a battery in an embodiment of the utility model;
[0022] Figure 5 yes Figure 4 Top view of the .
[0023] In the figure:
[0024] 10. Mylar film; 1. Large cover film; 2. Side cover film; 3. Bottom cover film; 4. Self-locking hole; 5. Self-locking buckle;
[0025] 20. Battery cell. DETAILED DESCRIPTION
[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0029] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0030] refer to Figure 1-Figure 3 As shown, in an embodiment of the utility model, a Mylar film is proposed, including a film body, which can be coated on the outer surface of a battery cell after being folded to protect the battery cell. The film body is integrally formed, and includes a bottom coating film 3, a large coating film 1 and a side coating film 2. The bottom edges of the two large coating films 1 are respectively connected to the two long edges of the bottom coating film 3, and the two side edges of the large coating films 1 are respectively connected to the two side coating films 2. Among the two side coating films 2 located on the same side of different large coating films 1, one of them is provided with a self-locking hole 4, and the other is provided with a self-locking buckle 5. The self-locking buckle 5 can be inserted into the self-locking hole 4 to realize the interlocking connection of the two side coating films 2 located on the same side of different large coating films 1.
[0031] By providing the self-locking buckle 5 and the self-locking hole 4 that cooperate with each other on the side covering film 2, the two side covering films 2 located on the same side of the two large covering films 1 can be interlocked. In the interlocked state, the Mylar film 10 and the battery cell are tightly fitted, and the Mylar film 10 will not wrinkle or melt due to its own elasticity. In addition, since the self-locking buckle 5 protrudes from the film body, there is a certain gap between the layers of the Mylar films 10 stacked in batches, which can greatly reduce the static electricity generated, thereby reducing the possibility of the robot grabbing multiple Mylar films 10 at a time.
[0032] It is worth noting that the battery cell is usually a flat rectangular parallelepiped structure. In the vertical state, the surface formed by the length and width directions of the battery cell is the bottom surface of the battery cell, the surface formed by the length and height directions of the battery cell is the large surface of the battery cell, and the surface formed by the width and height directions of the battery cell is the side surface of the battery cell. The long side of the bottom coating film 3 is the side of the bottom coating film 3 along the length of the battery cell, the bottom side of the large coating film 1 is the same length as the long side of the bottom coating film 3, the short side of the bottom coating film 3 is the side of the bottom coating film 3 along the width direction of the battery cell, the side side of the large coating film 1 is the side of the large coating film 1 along the height of the battery cell, and the side length of the side coating film 2 is the same as the side length of the large coating film 1. It can be understood that in order to completely cover the battery cell except the top surface, the width of the two side coating films 2 located on the same side of the two large coating films 1 must be greater than the width of the battery cell, so that the two side coating films 2 can overlap when folded.
[0033] In order to facilitate wrapping the Mylar film 10 outside the battery cell, a first folding line is set between the large covering film 1 and the bottom covering film 3, and a second folding line is set between the large covering film 1 and the side covering film 2. According to the prompts of the first folding line and the second folding line, the unfolded Mylar film 10 can be quickly folded into a groove-shaped structure with an opening.
[0034] refer to Figure 1 As shown, for the convenience of definition, one of the large covering films 1 is defined as the first large covering film, and the other is defined as the second large covering film. The width of the two side covering films 2 connected to the first large covering film is greater than the width of the two side covering films 2 connected to the second large covering film, and the self-locking hole 4 is arranged on the side of the side covering film 2 connected to the first large covering film away from the first large covering film. Exemplarily, the width of the two side covering films 2 connected to the first large covering film is consistent with the width of the battery cell, and the width of the two side covering films 2 connected to the second large covering film is half the width of the battery cell.
[0035] More specifically, the self-locking holes 4 are arranged in multiple rows along the width direction of the side covering film 2, and each row is arranged in multiple rows along the length direction of the side covering film 2. Correspondingly, the self-locking buckles 5 are also arranged in multiple rows. At the same time, considering the structural strength of the side covering film 2 and the position where the film body is prone to wrinkles, the self-locking holes 4 are arranged at both ends of the side covering film 2 in the length direction, that is, the self-locking holes 4 are not arranged in the middle position of the side covering film 2.
[0036] refer to Figure 3 As shown, the self-locking buckle 5 includes a column and a cone, wherein one end of the column is connected to the side coating film 2, and the other end is connected to the cone, the cross section of the column is the same as the shape of the self-locking hole 4, and the self-locking hole 4 is set to be circular, therefore, the column is a cylinder, and the cone gradually decreases in radius from the end connected to the column to the end away from the column, so that the self-locking buckle 5 can be easily inserted into the self-locking hole 4. Exemplarily, the diameter of the column is set to 0.7mm, the height is set to 0.4mm, the end face diameter of the cone connected to the column is 0.7mm, and the diameter of the self-locking hole 4 is 0.8mm.
[0037] The thickness of the Mylar film is generally 150 μm. Since the height of the column is greater than the thickness of the film, there is a certain gap between the two interlocking side coating films 2, and the electrolyte can pass through the gap.
[0038] Exemplarily, the self-locking hole 4 is directly punched on the Mylar film 10 , and the self-locking buckle 5 is injection molded by an injection molding process.
[0039] refer to Figure 4 and Figure 5As shown, another embodiment of the utility model also proposes a battery, including the above-mentioned Mylar film 10 and a battery cell, the bottom coating film 3 of the Mylar film 10 is attached to the bottom surface of the battery cell, the large coating film 1 of the Mylar film 10 is attached to the large surface of the battery cell, and the side coating film 2 of the Mylar film 10 is attached to the side of the battery cell, so as to wrap the battery cell inside. It is worth noting that the battery cell includes a plurality of battery cell monomers 20, and the sides of the battery cell monomers 20 are rounded. Therefore, after the Mylar film 10 concentrates and covers the plurality of battery cell monomers 20 inside, there can be a certain space between the corners of the battery cell monomers 20. In order not to affect the length of the battery cell and ensure that the assembly ratio of the battery cell is maximized, after the self-locking buckle 5 is locked with the self-locking hole 4, the self-locking buckle 5 faces the battery cell monomer 20 and is located at a position directly opposite to the rounded corner of the battery cell monomer 20, and the distance between two adjacent rows of self-locking buckles 5 should be equal to the width of the battery cell monomer 20.
[0040] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. Mylar film, comprising a film body, wherein the film body further comprises a bottom covering film (3), a large covering film (1) and a side covering film (2), wherein the bottom edges of the two large covering films (1) are respectively connected to the two long edges of the bottom covering film (3), and the two side edges of the large covering film (1) are respectively connected to the two side covering films (2), characterized in that: Of the two side covering films (2) located on the same side of the two large covering films (1), one is provided with a self-locking hole (4) and the other is provided with a self-locking buckle (5), and the self-locking buckle (5) can be inserted into the self-locking hole (4) and locked with the self-locking hole (4).
2. The Mylar film according to claim 1, characterized in that: The self-locking buckle (5) comprises a column and a cone, one end of the column is connected to the side coating film (2), and the other end is connected to the cone, and the radius of the cone gradually decreases from the end connected to the column to the end away from the column.
3. The Mylar film according to claim 2, characterized in that: The height of the column is greater than the thickness of the side coating film (2).
4. The Mylar film according to claim 1, characterized in that: The sum of the widths of the two side covering films (2) located on the same side of the two large covering films (1) is greater than the width of the battery cell to be covered.
5. The Mylar film according to claim 4, characterized in that The large covering film (1) is divided into a first large covering film and a second large covering film, the width of the two side covering films (2) connected by the first large covering film is greater than the width of the two side covering films (2) connected by the second large covering film, and the self-locking hole (4) is arranged on a side of the side covering film (2) connected to the first large covering film away from the first large covering film.
6. The Mylar film according to claim 5, characterized in that: The width of the two side covering films (2) connected to the first large covering film is the same as the width of the battery cell, and the width of the two side covering films (2) connected to the second large covering film is half the width of the battery cell.
7. The Mylar film according to claim 1, characterized in that: The self-locking holes (4) are arranged in a plurality of rows on the side covering film (2) along the width direction of the side covering film (2), and each row has a plurality of self-locking holes arranged along the length direction of the side covering film (2).
8. The Mylar film according to claim 1, characterized in that The self-locking holes (4) are arranged on both sides of the side covering film (2) in the length direction.
9. The Mylar film according to claim 1, characterized in that: A first folding line is provided between the large covering film (1) and the bottom covering film (3), and a second folding line is provided between the large covering film (1) and the side covering film (2).
10. A battery, characterized in that It comprises a battery cell composed of a plurality of battery cell monomers (20) and a Mylar film as claimed in any one of claims 1 to 9, wherein the sides of the battery cell monomers (20) are rounded, the Mylar film is wrapped around the plurality of battery cell monomers (20), and the self-locking buckle (5) faces the battery cell monomers (20) and is directly opposite to the rounded corners of the battery cell monomers (20).