Mylar membrane, battery and power-related equipment

Abstract

The utility model provides a Mylar membrane, a battery and power-related equipment, and relates to the technical field of lithium batteries. The Mylar film comprises a middle wrapping piece and outer surrounding pieces arranged at the two ends of the middle wrapping piece. The middle coating sheet and the outer surrounding sheet can be encircled to form a coating structure, and a containing groove capable of containing a battery cell is formed in the coating structure; through hole elements are arranged on the middle coating sheet and the outer surrounding sheet; and the through hole elements of the middle coating sheet and / or the outer surrounding sheet are convex through hole elements. According to the Mylar membrane provided by the invention, the protruding through hole elements are structurally arranged, so that additional structural support is provided, the Mylar membrane can better adapt to the size change of a battery cell in the charging and discharging process, the problem of untight attachment caused by poor rebound resilience of a material is reduced, the performance of a battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a Mylar film, a battery, and electrical equipment. Background Art

[0002] Lithium batteries, as efficient energy storage devices, are widely used in modern electronics and electric vehicles. One of their core components is the bare cell, and the protective layer of the bare cell, Mylar film, plays a crucial role in battery quality and safety. Mylar film is an insulating plastic film that, when applied to the outside of the bare cell, provides physical protection, preventing external substances and the environment from affecting the battery, and preventing short circuits between the positive and negative electrodes within the battery.

[0003] In the lithium-ion battery manufacturing process, the process of hot-melting Mylar film onto bare cells is a key step in battery preparation. This process design tightly wraps the Mylar film around the outside of the bare cells to provide protection. The Mylar film coating not only prevents short circuits caused by scratches between the cells and the inner wall of the battery casing, but also provides a certain degree of insulation from liquid corrosion. However, existing technologies have some shortcomings in implementation.

[0004] First, during the wrapping process of the Mylar film, if the air is not properly removed or the film is not evenly wrapped around the bare battery cell, bubbles or wrinkles will be generated, which will not only affect the appearance of the battery, but may also affect the performance of the battery. Secondly, although the dense surface of the Mylar film can isolate the liquid, it also makes it difficult for the battery cell to absorb and infiltrate the electrolyte, which in turn affects the performance of the battery. In addition, the Mylar film material itself is relatively hard and lacks resilience, which causes the internal negative electrode sheet of the battery to expand after it is fully charged, and the Mylar film is stretched. After discharge, the thickness of the battery cell recovers, but the Mylar film cannot rebound, resulting in a loose fit between the battery cell and the film.

[0005] In summary, existing Mylar film technology suffers from defects such as bubbles and wrinkles during lithium battery manufacturing, difficulty with electrolyte infiltration, and poor material resilience. These issues collectively affect the performance and lifespan of lithium batteries. Addressing these issues is crucial for improving the quality and safety of lithium batteries. Utility Model Content

[0006] In view of this, the purpose of this application is to provide a Mylar film, a battery and electrical equipment, aiming to solve technical problems such as bubbles and wrinkles, difficulty in electrolyte infiltration, and poor material resilience in conventional Mylar film technology.

[0007] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0008] The present application provides a Mylar film, comprising:

[0009] An intermediate covering sheet and outer covering sheets provided at both ends of the intermediate covering sheet;

[0010] The intermediate covering sheet and the outer surrounding sheet can be combined to form a covering structure, and the covering structure is provided with a receiving groove capable of receiving a battery cell, so that the battery cell in the receiving groove can be covered by the covering structure;

[0011] The intermediate covering sheet and the outer surrounding sheet are both provided with through-hole elements; and the through-hole elements of the intermediate covering sheet and / or the outer surrounding sheet are convex through-hole elements.

[0012] In one embodiment, the through-hole element includes a first through-hole structure on the intermediate covering sheet and a second through-hole structure on the outer covering sheet;

[0013] The second through hole structure is a raised through hole structure.

[0014] In one embodiment, the second through-hole structure is a through-hole structure that protrudes in a direction away from the battery cell.

[0015] In one embodiment, the second through hole structure includes a bottom hole provided on the outer surrounding piece, a raised portion provided on the bottom hole, and a top hole provided at an end of the raised portion away from the bottom hole;

[0016] The bottom hole and the top hole are connected through the protrusion.

[0017] In one embodiment, the protrusion is a structure that is limited by the outer surrounding piece in a direction away from the bottom hole.

[0018] In one embodiment, a side opening is provided on the side wall of the raised portion.

[0019] In one embodiment, the number of the side openings is at least two.

[0020] In one embodiment, the outer surrounding piece includes a first outer surrounding extension piece and a second outer surrounding extension piece;

[0021] The first outer surrounding extension piece is provided with an extension protrusion;

[0022] The second outer surrounding extension piece is provided with an extension clamping portion; the extension clamping portion is provided with an insertion opening corresponding to the extension protrusion;

[0023] The extending protrusion can be inserted into the insertion opening of the extending clamping portion, so as to facilitate the clamping connection between the first outer surrounding extension piece and the second outer surrounding extension piece.

[0024] In addition, the present application also provides a battery, comprising the Mylar film as described above.

[0025] In addition, the present application also provides an electrical device, including the battery as described above.

[0026] The present application provides a Mylar film, comprising: an intermediate covering sheet and outer surrounding sheets arranged at both ends of the intermediate covering sheet; the intermediate covering sheet and the outer surrounding sheets can be combined to form a covering structure, and the covering structure is provided with a receiving groove that can accommodate a battery cell, so that the battery cell in the receiving groove can be covered by the covering structure; the intermediate covering sheet and the outer surrounding sheet are both provided with through-hole elements; and the through-hole elements of the intermediate covering sheet and / or the outer surrounding sheet are raised through-hole elements.

[0027] In this application, the Mylar film technical solution provided effectively solves many problems in the prior art through its innovative structural design and through-hole components. First, the design of the through-hole components helps the electrolyte to penetrate and infiltrate the battery cell more effectively, thereby improving battery performance. Secondly, the raised through-hole components provide additional structural support, allowing the Mylar film to better adapt to the dimensional changes of the battery cell during the charging and discharging process, reducing the problem of loose fitting due to poor material resilience. Finally, this Mylar film structure can solve the problems of wrinkling and powder shedding of battery pole pieces, which helps to extend the cycle life and overall life of the battery. In summary, this technical solution aims to improve the performance and life of the battery through structural improvements, while improving production efficiency and solving problems in the prior art.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Shows a schematic diagram of the overall structure of the battery in some embodiments of the present application;

[0031] Figure 2 A schematic diagram showing the positional relationship and connection relationship between the coating structure and the battery cell in some embodiments of the present application;

[0032] Figure 3 A schematic structural diagram showing the Mylar film in an unfolded state in some embodiments of the present application is shown;

[0033] Figure 4 A schematic side view of the second through-hole structure in some embodiments of the present application is shown;

[0034] Figure 5 A schematic top view of the second through-hole structure in some embodiments of the present application is shown;

[0035] Figure 6 A schematic diagram of the three-dimensional structure of the second through-hole structure in some embodiments of the present application is shown;

[0036] Figure 7 Schematic diagram showing the structure of the Mylar film in an unfolded state (including marking the structures of the first outer surrounding extension piece and the second outer surrounding extension piece) in some embodiments of the present application.

[0037] Description of main component symbols:

[0038] 100-battery; 1-Mylar film; 11-middle covering sheet; 12-outer covering sheet; 121-first outer covering extension sheet; 1211-extended protrusion; 122-second outer covering extension sheet; 1221-extended clamping portion; 1222-insertion opening; 13-covering structure; 131-accommodation groove; 14-through hole element; 141-first through hole structure; 142-second through hole structure; 1421-bottom hole; 1422-protrusion; 1423-top hole; 1424-side opening; 2-battery cell. DETAILED DESCRIPTION

[0039] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0043] refer to Figure 1 , an embodiment of the present application provides a Mylar film, comprising:

[0044] The intermediate covering sheet 11 and the outer surrounding sheets 12 provided at both ends of the intermediate covering sheet 11; the intermediate covering sheet 11 and the outer surrounding sheet 12 can be combined to form a covering structure 13, and the covering structure 13 is provided with a receiving groove 131 that can be loaded with the battery cell 2, so that the battery cell 2 in the receiving groove 131 can be covered by the covering structure 13 (such as Figure 2 the intermediate covering sheet 11 and the outer surrounding sheet 12 are provided with a through-hole element 14; and, the through-hole element 14 of the intermediate covering sheet 11 and / or the outer surrounding sheet 12 is a raised through-hole element 14.

[0045] As mentioned above, the Mylar film 1 can be composed of two main parts: the middle cover sheet 11 and the outer cover sheets 12 arranged on both sides of the middle cover sheet 11. That is, the "outer cover sheet 12 - middle cover sheet 11 - outer cover sheet 12" structure constitutes the entire Mylar film 1.

[0046] The Mylar film 1 can have two states, namely an unfolded state and a folded state.

[0047] (1) In the unfolded state, the outer surrounding sheet 12-intermediate covering sheet 11-outer surrounding sheet 12 are connected together to form a planar three-part connected structure;

[0048] (2) In the folded state, the middle covering sheet 11 and the outer surrounding sheet 12 are combined to form a covering structure 13. The covering structure 13 is a semi-enclosed box-shaped structure with a front opening, in which a receiving groove 131 is provided for accommodating the battery cell 2.

[0049] A through-hole element 14 is provided on both the intermediate covering sheet 11 and the outer covering sheet 12 . The through-hole element 14 is a structure having holes, which enables the flow of electrolyte.

[0050] Furthermore, in at least one portion of the intermediate cladding sheet 11 and the outer cladding sheet 12, the through-hole element 14 is a convex through-hole element 14, that is, the following situations exist:

[0051] (1) The through-hole elements 14 of the intermediate covering sheet 11 and the outer covering sheet 12 are all convex through-hole elements 14 .

[0052] (2) The through-hole elements 14 of the intermediate cladding sheet 11 are convex through-hole elements 14 .

[0053] (3) The through-hole element 14 of the outer surrounding sheet 12 is a convex through-hole element 14 .

[0054] As mentioned above, the protruding through-hole element 14 is a structure protruding from the plane where the intermediate covering sheet 11 and / or the outer surrounding sheet 12 based on the Mylar film 1 are located, and a hole exists in the protruding structure.

[0055] The raised through-hole elements 14 increase the air permeability of the Mylar film 1, which is particularly important for dissipating heat generated during the charging and discharging process of the lithium battery 100. Good air permeability helps dissipate heat within the battery 100, thereby reducing the operating temperature of the battery 100 and improving the safety and service life of the battery 100.

[0056] The through-hole element 14 allows the electrolyte to better penetrate and infiltrate the battery cell 2, which is crucial to the performance of the battery 100. The raised design helps to distribute the electrolyte more evenly, thereby improving the charge and discharge efficiency and overall performance of the battery 100.

[0057] The raised through-hole elements provide additional structural support for the Mylar film 1, enabling the film to better adapt to dimensional changes during expansion and contraction, reducing the problem of loose fitting caused by poor resilience of the printed material, thereby improving the stability and reliability of the battery 100.

[0058] In addition, in the embodiment of the present application, the material of the Mylar film 1 is an elastic material, so that the Mylar film 1 can have a certain rebound effect.

[0059] Furthermore, the material of the Mylar film 1 may include but is not limited to at least one of nitrile rubber, high molecular weight polyethylene, various ethylene copolymers, and polyamide. These materials have the characteristics of good insulation and corrosion resistance.

[0060] As a result, the Mylar film 1 in the embodiment of the present application can achieve good resilience. When wrapping the battery 100, the elastic Mylar can be designed to a suitable size to wrap around the surface of the battery cell 2 without wrinkling. During the charge and discharge process of the battery 100, the Mylar can expand and rebound along with the expansion of the battery cell 2.

[0061] In some embodiments, as Figure 3 As shown, the through-hole element 14 includes a first through-hole structure 141 on the intermediate covering sheet 11 and a second through-hole structure 142 on the outer surrounding sheet 12;

[0062] The second through-hole structure 142 is a protruding through-hole structure.

[0063] As mentioned above, the first through-hole structure 141 is located on the intermediate coating sheet 11 and is a part of the through-hole element 14. It provides a structural support to allow the electrolyte to flow and penetrate. The first through-hole structure 141 is a non-protruding structure.

[0064] The first through-hole structure 141 itself enhances the air permeability of the Mylar film 1 and the permeability of the electrolyte, thereby improving the charge and discharge efficiency of the battery cell 2 and the performance of the battery 100 .

[0065] As described above, the second through-hole structure 142 is located on the outer enclosure sheet 12 and is a part of the through-hole element 14. It is a raised through-hole structure. Compared with a planar through-hole structure, the raised design provides additional structural support and space, which is beneficial to the flow and penetration of the electrolyte.

[0066] The specific structure of the second through-hole structure 142 provides a better electrolyte flow path and enhances structural support. The raised design helps to more evenly distribute the electrolyte, improving the charge and discharge efficiency of the battery 100. The raised structure provides additional space, allowing the Mylar film 1 to better adapt to the dimensional changes of the battery cell 2 during the charge and discharge process.

[0067] The electrolyte infiltration effect is improved, the charge and discharge efficiency and the overall performance of the battery 100 are improved, and the problem of loose fitting caused by poor material resilience is reduced.

[0068] In some embodiments, the second through-hole structure 142 is a through-hole structure that protrudes in a direction away from the battery core 2 .

[0069] The second through-hole structure 142 is a raised through-hole structure on the outer enclosure sheet 12, and is convex and faces away from the battery cell 2. This design improves upon the conventional planar through-hole structure by making the through-hole structure convex and facing away from the battery cell 2, providing a better electrolyte flow path and more structural support.

[0070] The raised through-hole structure extending in the direction away from the battery cell 2 (protruding outward in the coating structure 13) plays multiple roles in the design of the Mylar film 1. It enhances the electrolyte infiltration effect by increasing the contact surface area between the electrolyte and the battery cell 2, which is crucial for improving the charge and discharge performance of the battery 100 and extending the cycle life. At the same time, this structure provides additional structural support, allowing the Mylar film 1 to more effectively adapt to the volume changes of the battery cell 2 during the charge and discharge process, reducing the problem of loose fitting caused by insufficient material resilience. In addition, the raised through-hole structure can also provide an outward force when the battery cell 2 expands during charging, helping to disperse the pressure inside the battery cell 2 and reduce stress concentration, thereby reducing the risk of wrinkling of the electrode inside the battery cell 2, further improving the stability and reliability of the battery 100.

[0071] In some embodiments, reference Figure 4 The second through hole structure 142 includes a bottom hole 1421 provided on the outer surrounding piece 12, a raised portion 1422 provided on the bottom hole 1421, and a top hole 1423 provided at an end of the raised portion 1422 away from the bottom hole 1421;

[0072] The bottom hole 1421 and the top hole 1423 are connected through the protrusion 1422 .

[0073] As described above, the second through hole structure 142 is designed to realize a direct passage of electrolyte from the bottom hole 1421 to the top hole 1423 by providing the bottom hole 1421, the protrusion 1422 and the top hole 1423 on the outer surrounding sheet 12 (refer to Figure 5 Top view and Figure 6 (3D structural diagram) This optimizes the electrolyte flow path within the battery cell 2, improving electrolyte distribution uniformity and infiltration efficiency. The presence of protrusions 1422 not only enhances the rigidity and stability of the Mylar film 1, maintaining its shape as the battery cell 2 changes volume, thus reducing blockage in the electrolyte channel, but also acts as a buffer structure, reducing the pressure generated within the battery cell 2 due to volume changes, thereby reducing internal stress in the battery cell 2 and the risk of electrode wrinkling.

[0074] In some embodiments, the protrusion 1422 is a structure that is limited by the outer surrounding piece 12 in a direction away from the bottom hole 1421.

[0075] As mentioned above, the shape of the protrusion 1422 is that it starts from the bottom hole 1421 and gradually narrows toward the top hole 1423 , forming a trapezoidal or trapezoidal-like cross-sectional structure.

[0076] The constricted structure, known as a trapezoidal cross-section (also known as a "crater" structure), offers high stability due to its geometric properties. This maintains structural integrity when the battery cell 2 expands or contracts, reducing electrolyte channel blockage caused by material deformation. The trapezoidal cross-section provides a larger bottom area, allowing the electrolyte to flow more quickly from the bottom hole 1421 to the top hole 1423, improving electrolyte flow efficiency.

[0077] The trapezoidal structure facilitates uniform distribution of electrolyte within the battery cell 2, as its larger bottom area allows more electrolyte to contact the battery cell 2, while the gradually narrowing upper portion helps guide the electrolyte to flow toward the center of the battery cell 2. The raised portion 1422 of the trapezoidal structure can better adapt to the volume changes of the battery cell 2 during charging and discharging, reducing the stress on the Mylar film 1 caused by the expansion of the battery cell 2, thereby reducing the risk of wrinkling of the electrode sheet inside the battery cell 2.

[0078] Additionally, the trapezoidal structure can reduce material usage while providing necessary structural support, as its gradually narrowing design allows for reduced material thickness without sacrificing strength.

[0079] In some embodiments, reference Figure 5 and Figure 6 A side opening 1424 is provided on the side wall of the raised portion 1422 .

[0080] The dimensions of the raised second through-hole structure 142 can be tailored to the model of the battery cell 2. For example, the thickness of a bare 50Ah battery cell 2 (length, width, and height) is approximately 34mm, and the inner wall of the housing is approximately 38.4mm. To allow for expansion, the second through-hole structure 142 can be designed with a top hole 1423 having a diameter of 2mm, a bottom hole 1421 having a diameter of 3mm, a height of 2mm, and a side opening having a diameter of 1mm.

[0081] The design of the side opening 1424 on the side wall of the protrusion 1422 has multiple advantages. First, it increases the cross-sectional area of the electrolyte flow, allowing the electrolyte to pass through the protrusion 1422 more quickly and evenly, thereby improving the flow efficiency and infiltration effect of the electrolyte. Secondly, the side opening 1424 provides multiple channels to promote the uniform distribution of the electrolyte inside the battery cell 2, thereby improving the overall performance of the battery 100. In addition, the side opening 1424 also enhances the air permeability of the Mylar film 1, helps to dissipate heat inside the battery 100, reduces the operating temperature, and improves the safety and service life of the battery 100. During the charging and discharging process of the battery cell 2, the volume of the battery cell 2 will change. The design of the side opening 1424 enables the protrusion 1422 to provide more flexibility when the battery cell 2 expands, reducing the pressure on the battery cell 2, thereby reducing the internal stress of the battery cell 2 and the risk of electrode wrinkling. Finally, the design of the side opening 1424 can reduce the use of materials without sacrificing structural strength, while maintaining the rigidity of the Mylar film 1 and ensuring its stability during the expansion and contraction of the battery cell 2.

[0082] In some embodiments, the number of the side openings 1424 is at least two.

[0083] The side openings 1424 may be two or more in number, and may be symmetrically or asymmetrically arranged.

[0084] The side openings 1424 can increase the electrolyte infiltration effect. For example, opening a circular hole on each side is more conducive to improving the electrolyte infiltration effect.

[0085] It should be noted that the electrolyte is a lithium ion transmission medium. A sufficient amount of electrolyte has only a positive effect on the transmission of the lithium battery 100. Only when the battery cell 2 is well infiltrated can the capacity of the battery 100 be normally exerted. Otherwise, if the electrolyte is insufficiently infiltrated, the capacity of the battery cell 2 will be low, resulting in an inability to ship. The second through-hole structure 142 provided in the embodiment of the present application, in which a side opening 1424 is provided, can greatly shorten the high-temperature static infiltration time of the battery cell 2 after liquid injection.

[0086] If the Mylar film 1 has only bottom openings after coating, that is, a structure in which the top hole 1423 and the bottom hole 1421 are connected, the electrolyte will not be able to penetrate the battery cell 2 from the bottom. In this embodiment, the Mylar film 1 provides a second through-hole structure 142 with a side opening 1424, which can increase the contact area between the electrolyte and the battery cell 2, making it easier for the electrolyte to enter the battery cell 2, thereby optimizing the formation process, shortening the standing time, and achieving the purpose of increasing production efficiency and reducing energy consumption costs.

[0087] In some embodiments, reference Figure 7The outer surrounding piece 12 includes a first outer surrounding extension piece 121 and a second outer surrounding extension piece 122;

[0088] The first outer enclosing extension piece 121 is provided with an extension protrusion 1211;

[0089] The second outer enclosing extension piece 122 is provided with an extension clamping portion 1221 ; the extension clamping portion 1221 is provided with an insertion opening 1222 corresponding to the extension protrusion;

[0090] The extending protrusion 1211 can be inserted into the insertion opening 1222 of the extending clamping portion 1221 , so that the first outer enclosure extending piece 121 and the second outer enclosure extending piece 122 are clamped together.

[0091] It should be noted that during the installation process of the conventional Mylar film 1, high-temperature tape needs to be attached to both sides and the bottom to fix the Mylar film and the battery cell 2 after wrapping.

[0092] To avoid this inefficient installation method, in this embodiment, the extended protrusion 1211 can be inserted into the insertion opening 1222 of the extended engaging portion 1221, thereby enabling the first outer enclosure extension piece 121 to be engaged with the second outer enclosure extension piece 122. In other words, a snap-fit design is provided on the side of the Mylar film 1. After wrapping, the two sides do not need to be attached using conventional tape; instead, the two sides are secured together through a snap-fit structure. This approach reduces costs and improves production efficiency.

[0093] In addition, an embodiment of the present application further provides a battery 100 , comprising the Mylar film 1 as described in any one of the above embodiments.

[0094] In addition, an embodiment of the present application further provides an electrical device, comprising the battery 100 as described in any one of the above embodiments.

[0095] The above-mentioned electrical equipment may include, but is not limited to: electric vehicles, electric bicycles, laptops, smart phones, tablet computers, power tools, portable music players, digital cameras and camcorders, medical equipment, smart home devices, drones, electronic watches, electronic cigarettes, game consoles and street lights, etc.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0097] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A Mylar film, characterized in that: include: An intermediate covering sheet and outer covering sheets provided at both ends of the intermediate covering sheet; The intermediate covering sheet and the outer surrounding sheet can be combined to form a covering structure, and the covering structure is provided with a receiving groove capable of receiving a battery cell, so that the battery cell in the receiving groove can be covered by the covering structure; The intermediate covering sheet and the outer surrounding sheet are both provided with through-hole elements; and the through-hole elements of the intermediate covering sheet and / or the outer surrounding sheet are convex through-hole elements.

2. The Mylar film according to claim 1, wherein: The through-hole element includes a first through-hole structure on the intermediate covering sheet and a second through-hole structure on the outer covering sheet; The second through hole structure is a raised through hole structure.

3. The Mylar film according to claim 2, wherein: The second through hole structure is a through hole structure that protrudes in a direction away from the battery core.

4. The Mylar film according to claim 2, wherein: The second through hole structure includes a bottom hole provided on the outer surrounding piece, a raised portion provided on the bottom hole, and a top hole provided at an end of the raised portion away from the bottom hole; The bottom hole and the top hole are connected through the protrusion.

5. The Mylar film according to claim 4, wherein: The protrusion is a structure that is limited by the outer surrounding piece in a direction away from the bottom hole.

6. The Mylar film according to claim 4, wherein: A side opening is provided on the side wall of the raised portion.

7. The Mylar film according to claim 6, wherein: The number of the side openings is at least two.

8. The Mylar film according to claim 1, wherein: The outer surrounding piece includes a first outer surrounding extension piece and a second outer surrounding extension piece; The first outer surrounding extension piece is provided with an extension protrusion; The second outer surrounding extension piece is provided with an extension clamping portion; the extension clamping portion is provided with an insertion opening corresponding to the extension protrusion; The extending protrusion can be inserted into the insertion opening of the extending clamping portion, so as to facilitate the clamping connection between the first outer surrounding extension piece and the second outer surrounding extension piece.

9. A battery, characterized in that: The method comprises the Mylar film according to any one of claims 1 to 8.

10. An electrical equipment, characterized in that: Comprising the battery of claim 9.

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