Mylar film for battery and Mylar film assembly

Abstract

The utility model discloses a mylar membrane for a battery and a mylar membrane assembly. The mylar film comprises a first coating sheet, a second coating sheet and a bottom supporting sheet connected between the first coating sheet and the second coating sheet, the first side edge wrapping sheet and the second side edge wrapping sheet are arranged in pairs and are respectively connected to any side edge, adjacent to the bottom supporting sheet, of the first wrapping sheet and the second wrapping sheet in a foldable manner; wherein the first side edge wrapping sheet and the second side edge wrapping sheet are provided with fixing structures suitable for buckling type matching, so that the mylar film can be conveniently fixed into a preset three-dimensional shape. According to the scheme, the Mylar film coating process can be simplified, the operation efficiency of the Mylar film coating process is improved, and the adhesive tape cost and the equipment cost of a film coating hot melting mechanism are saved.

Description

Technical Field

[0001] This utility model generally relates to the field of battery technology. More specifically, this utility model relates to a Mylar membrane for batteries and a Mylar membrane assembly. Background Technology

[0002] Mylar film, also known as polyester film, is a type of polyester film (PETP) commonly used in battery manufacturing. It is widely used due to its excellent insulation properties, mechanical strength, and thermal stability. Mylar film exhibits high durability, able to withstand the high temperatures and pressures of the battery environment, and is not easily deformed or broken. Furthermore, Mylar film possesses high chemical stability, resisting chemical reactions within the battery and ensuring its stability and safety.

[0003] In battery manufacturing, Mylar film can serve as a separator, electrolyte wetting layer, and protective layer. Specifically, due to its excellent insulation and thermal stability, Mylar film can effectively isolate the charge between the positive and negative electrodes, preventing potential short-circuit accidents. Therefore, Mylar film can be used as a separator between the positive and negative electrodes of lithium-ion batteries. Furthermore, the smooth surface and chemical stability of Mylar film make it an excellent carrier of lithium ions, ensuring uniform electrolyte distribution and providing sufficient electrolyte conductivity. Thus, Mylar film can be used as an electrolyte wetting layer in lithium-ion batteries. In addition, Mylar film can also serve as a protective layer for the battery casing, preventing leakage of internal materials and corrosion from the external environment, thereby improving battery safety and lifespan. Current Mylar film coating processes require pre-fixing the Mylar film to the battery cell with adhesive, and then heat-sealing the Mylar film to the cover plate. This process is cumbersome, cannot be performed quickly, and is inefficient.

[0004] In view of this, there is an urgent need to provide a Mylar film for batteries that can simplify the Mylar film coating process, improve the operational efficiency of the Mylar film coating process, and save on tape costs and equipment costs of the film coating hot-melt mechanism. Utility Model Content

[0005] In order to at least solve one or more of the technical problems mentioned above, the present invention proposes a Mylar membrane for batteries in several aspects.

[0006] In a first aspect, the present invention provides a Mylar film for a battery, comprising a first covering sheet 111, a second covering sheet 112, and a base support sheet 113 connected between the first covering sheet 111 and the second covering sheet 112; a first side covering sheet 114 and a second side covering sheet 115, wherein the first side covering sheet 114 and the second side covering sheet 115 are configured in pairs and are foldably connected to any side of the first covering sheet 111 and the second covering sheet 112 adjacent to the base support sheet 113; wherein the first side covering sheet 114 and the second side covering sheet 115 have a fixing structure suitable for snap-fit ​​engagement, so as to fix the Mylar film 110 into a preset three-dimensional shape.

[0007] In some embodiments, the fixing structure includes: an elongated hole 212 provided on the first side covering sheet 114; a protruding tongue 213 correspondingly provided on the second side covering sheet 115 extending outward from the side of the second side covering sheet 115; and the protruding tongue 213 is adapted to be pressed into the elongated hole 212 for fixing.

[0008] In some embodiments, the side of the base plate 113 may also be foldably connected with a pre-shaped notch covering piece 510, wherein the notch covering piece 510 is shaped to extend from the edge of the base plate 113 toward the center portion of the base plate 113, so as to cover the gap 410 when the Mylar film 110 is folded.

[0009] In some embodiments, a plurality of fixing holes 211 are also included; wherein the plurality of fixing holes 211 are arranged along the edge away from the bottom support 113 on the first covering sheet 111, the second covering sheet 112, the first side covering sheet 114 and the second side covering sheet 115 respectively, and after the Mylar membrane 110 is fixed into a preset three-dimensional shape, the plurality of fixing holes 211 are arranged around the top edge of the Mylar membrane 110.

[0010] In a second aspect, the present invention provides a Mylar membrane assembly for a battery, comprising: a battery cell, a Mylar membrane 110 as described in the first aspect covering the battery cell, and a cover plate 120; the Mylar membrane 110 covers the battery cell with a pre-existing top opening, and the cover plate 120 is affixed to the top opening to cover the top of the battery cell, and is firstly fixed by a fixing buckle 210 on the cover plate 120 and a fixing hole 211 on the Mylar membrane 110, and secondly fixed by a narrow hole 212 and a protrusion 213 on the side of the Mylar membrane 110, so as to achieve the covering and fixing of the battery cell.

[0011] In some embodiments, the first covering sheet 111 and the second covering sheet 112 are folded along their connection with the base plate 113 to cover the front and back of the battery cell, respectively; the first side covering sheet 114 and the second side covering sheet 115 are folded and overlapped along their connection with the first covering sheet 111 and the second covering sheet 112 to cover the side of the battery cell, so that the Mylar film 110 covers the battery cell and forms a preset three-dimensional shape.

[0012] In some embodiments, the cover plate 120 has a boss 310, the size of which is adapted to the top opening. After the cover plate 120 is placed over the top opening, the boss 310 is embedded in the top opening to cover the top of the battery cell.

[0013] In some embodiments, the base plate 113 is provided with a plurality of immersion holes 511 so that electrolyte can enter and wet the battery cell through the plurality of immersion holes 511.

[0014] In some embodiments, the surface of the cover plate 120 is further provided with an electrode post 311, a liquid injection through hole 312, and an explosion-proof valve 313.

[0015] In some embodiments, the boss 310 is recessed inward to form a recessed groove 610, and a battery connecting piece 710 is provided in the recessed groove 610. The battery connecting piece 710 is used to connect the positive and negative terminals of the battery and the positive and negative terminals of the cover plate.

[0016] Using the Mylar film for batteries provided above, this embodiment of the invention fixes the Mylar film into a preset three-dimensional shape through a snap-fit ​​fixing structure on the first and second side covering sheets to cover the battery cell. This embodiment eliminates the need for pre-fixation with adhesive between the Mylar film and the battery cell, achieving covering and fixing solely through the fixing structure, greatly simplifying the Mylar film covering process, making the process more convenient and faster, improving operational efficiency, and saving on tape costs. Furthermore, this embodiment also uses fixing buckles on the cover plate and fixing holes on the Mylar film for covering and fixing, avoiding heat-sealing between the Mylar film and the cover plate, thus saving on the equipment cost of the heat-sealing mechanism. Attached Figure Description

[0017] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0018] Figure 1This is an exemplary schematic diagram showing a Mylar film 110 for a battery according to an embodiment of the present invention;

[0019] Figure 2 This is an exemplary schematic diagram showing a folded Mylar membrane 110 according to an embodiment of the present invention;

[0020] Figure 3 This is an exemplary structural block diagram illustrating a Mylar membrane assembly 100 for a battery according to an embodiment of the present invention;

[0021] Figure 4 This is an exemplary schematic diagram showing a Mylar membrane assembly 100 for a battery according to an embodiment of the present invention;

[0022] Figure 5 This is an exemplary schematic diagram showing a cover plate 120 according to an embodiment of the present utility model;

[0023] Figure 6 This is yet another exemplary schematic diagram showing the cover plate 120 according to an embodiment of the present utility model;

[0024] Explanation of reference numerals in the attached drawings: 100-Mylar membrane assembly, 110-Mylar membrane, 120-Cover plate, 111-First covering sheet, 112-Second covering sheet, 113-Bottom support sheet, 114-First side covering sheet, 115-Second side covering sheet, 210-Fixing buckle, 211-Fixing hole, 212-Elongated hole, 213-Protruding tongue, 301-Battery cell, 310-Boss, 311-Terminal post, 312-Injection through hole, 313-Explosion-proof valve, 410-Void clearance notch, 510-Notch covering sheet, 610-Recessed groove, 710-Battery connecting piece, 800-Top opening. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be understood that the terms "comprising" and "including" used in the specification and claims of this utility model indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0028] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0029] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] Figure 1 This is an exemplary schematic diagram illustrating a Mylar film 110 for a battery according to an embodiment of the present invention. Figure 1 As shown, the Mylar film 110 includes a first covering sheet 111, a second covering sheet 112, a base support sheet 113 connected between the first covering sheet 111 and the second covering sheet 112, and a first side covering sheet 114 and a second side covering sheet 115. The first side covering sheet 114 and the second side covering sheet 115 are arranged in pairs and are foldably connected to any side of the first covering sheet 111 and the second covering sheet 112 adjacent to the base support sheet 113. For example... Figure 1 The example shows a first side covering sheet 114 arranged in pairs on the side of the first covering sheet 111, and a second side covering sheet 115 arranged in pairs on the side of the second covering sheet 112.

[0031] It should be understood that the figures are merely illustrative. The aforementioned first side covering sheet 114 can also be configured in pairs on the sides of the second covering sheet 112, and the second side covering sheet 115 can be configured in pairs on the sides of the first covering sheet 111. Alternatively, the first covering sheet 111 and the second covering sheet 112 can each have a first side covering sheet 114 and a second side covering sheet 115 configured in pairs. This application does not impose any limitations in this regard.

[0032] In some embodiments, the first covering sheet 111 and the second covering sheet 112 are folded (e.g., folded 90°) along their connection with the base plate 113 to cover the front and back sides (the sides opposite to the front) of the battery cell. The first side covering sheet 114 and the second side covering sheet 115 are folded (e.g., folded 90°) along their connection with the first covering sheet 111 and the second covering sheet 112, and overlapped to cover the sides of the battery cell, so that the Mylar film 110 covers the battery cell, forming a preset three-dimensional shape, for example... Figure 2 This is an exemplary schematic diagram showing a folded Mylar membrane 110 according to an embodiment of the present invention.

[0033] In some implementations, the shapes and sizes of the aforementioned first covering sheet 111, second covering sheet 112, and base support sheet 113 are adapted to the shape of the battery cell. This invention does not impose any limitations in this regard. For example, the figures exemplify rectangular shapes for the first covering sheet 111, second covering sheet 112, and base support sheet 113. In other implementations, the dimensions of the first side covering sheet 114 and the second side covering sheet 115 are both smaller than the dimensions of the first covering sheet 111 and the second covering sheet 112, and the shapes and sizes of the first side covering sheet 114 and the second side covering sheet 115 are also adapted to the shape of the battery cell. This invention does not impose any limitations in this regard. For example, the figures exemplify rectangular shapes for the first side covering sheet 114 and the second side covering sheet 115.

[0034] In some embodiments, the first side covering sheet 114 and the second side covering sheet 115 have a fastening structure suitable for snap-fit ​​engagement, so as to fix the Mylar membrane 110 into a preset three-dimensional shape. In some embodiments, the aforementioned fastening structure may include an elongated hole 212 provided on the first side covering sheet 114 and a corresponding tab 213 provided on the second side covering sheet 115 extending outward from the side of the second side covering sheet 115. The tab 213 is adapted to be pressed into the elongated hole 212 for fixation, thereby fixing the Mylar membrane 110 into the preset three-dimensional shape. In other embodiments, the elongated hole 212 may also be provided on the second side covering sheet 115, and the tab 213 extending outward from the side may be provided on the first side covering sheet 114. After the Mylar membrane 110 covers the battery cell, the positions of the elongated hole 212 and the tab 213 are such that the tab 213 is adapted to be pressed into the elongated hole 212 for fixation.

[0035] In some embodiments, the sides of the base plate 113 may also be foldably connected to a pre-defined shape (e.g., trapezoidal shape) notch-covering sheet 510, wherein the shape of the notch-covering sheet 510 is configured to extend from the edge of the base plate 113 toward the center portion of the base plate 113, so as to facilitate the covering of the gap 410 when the Mylar film 110 is folded. This gap 410 facilitates the folding and overlapping of the first side covering sheet 114 and the second side covering sheet 115 to completely cover the battery cell. In an implementation scenario, the notch-covering sheet can be folded first, and then the first side covering sheet 114 and the second side covering sheet 115 can be folded to ensure that the battery cell is completely covered on one side.

[0036] In some embodiments, the Mylar membrane 110 may further include a plurality of fixing holes for fixing the Mylar membrane to the cover plate. The plurality of fixing holes 211 are respectively arranged along the edges of the first covering sheet 111, the second covering sheet 112, the first side covering sheet 114, and the second side covering sheet 115 on the side away from the bottom support sheet 113, and after the Mylar membrane 110 is fixed into a preset three-dimensional shape, the plurality of fixing holes 211 surround the top edge of the Mylar membrane 110 (see...). Figure 2 In some implementation scenarios, the fixing holes 211 on the first covering sheet 111 and the first side covering sheet 114 are symmetrically arranged with the fixing holes 211 on the second covering sheet 112 and the second side covering sheet 115, and after the Mylar film 110 covers the battery cell, the corresponding fixing holes 211 on the first side covering sheet 114 and the second side covering sheet 115 overlap with each other.

[0037] As described above, this embodiment of the invention uses a snap-fit ​​fixing structure on the first and second side covering sheets to fix the Mylar film into a preset three-dimensional shape to cover the battery cell. This embodiment eliminates the need for pre-fixing with adhesive between the Mylar film and the battery cell, achieving covering and fixing solely through the fixing structure. This greatly simplifies the Mylar film covering process, making it more convenient and faster, improving operational efficiency, and saving on tape costs.

[0038] Figure 3 This is an exemplary structural block diagram illustrating a Mylar membrane assembly 100 for a battery according to an embodiment of the present invention. Figure 3 As shown, the Mylar membrane assembly 100 may include a battery cell 301, a Mylar membrane 110 covering the battery cell 301, and a cover plate 120. The following will be combined with... Figure 4 The Mylar membrane assembly 100 of the present invention is described in detail in the embodiments of the present invention.

[0039] Figure 4 This is an exemplary schematic diagram illustrating a Mylar membrane assembly 100 for a battery according to an embodiment of the present invention. Figure 4The image shows a Mylar membrane assembly 100, which includes a battery cell (not shown), a Mylar membrane 110, and a cover plate 120. A top opening (e.g., [missing information]) is provided after the Mylar membrane 110 covers the battery cell. Figure 2 As shown in the top opening 800, a cover plate 120 is placed over the top opening to cover the top of the battery cell. The cover plate 120 is first fixed to the Mylar membrane 110 via the fixing buckle 210 and the fixing hole 211, and second fixed via the elongated hole 212 and the protruding tongue 213 on the side of the Mylar membrane 110, so as to achieve the covering and fixing of the battery cell.

[0040] As described above, the bottom support 113 covers the bottom of the battery cell. The first covering piece 111 and the second covering piece 112 are folded at, for example, 90° along their connection with the bottom support 113 to cover the front and back of the lithium battery cell. The first side covering piece 114 and the second side covering piece 115 are folded at, for example, 90° along their connection with the first covering piece 111 and the second covering piece 112, and overlapped to cover the sides of the lithium battery cell, thereby achieving the Mylar membrane 110 covering the lithium battery cell. After the Mylar membrane 110 covers the lithium battery cell, the fixing hole 211 on the Mylar membrane 110 is adapted to be pressed into the fixing buckle 210 on the cover plate 120 for first fixation, so as to fix the cover plate and the Mylar membrane; the protruding tongue 213 is adapted to be pressed into the elongated hole 212 for second fixation, so as to fix the sides of the Mylar membrane.

[0041] As can be seen from the above description, the present invention also uses the fixing buckle on the cover plate and the fixing hole on the Mylar film for covering and fixing, which avoids the heat-fusion fixing between the Mylar film and the cover plate, and can save the equipment cost of the film covering heat-fusion mechanism.

[0042] See Figure 1 In some embodiments, the base plate 113 may also have multiple immersion holes 511 distributed thereon, so that electrolyte can enter and wet the battery cell through the multiple immersion holes 511. For example Figure 1 As shown, multiple liquid immersion holes 511 are evenly distributed on the base plate 113.

[0043] In some embodiments, the cover plate 120 has a boss 310, the size of which is adapted to the top opening. After the cover plate 120 is placed over the top opening, the boss 310 is embedded in the top opening to cover the top of the battery cell. In some embodiments, the fixing buckles 210 include a plurality of buckles, which are distributed around the outside of the boss 310. After the cover plate 120 is placed over the top opening, the fixing buckles 210 correspond to the fixing holes 211, and the fixing buckles 210 are pressed into the fixing holes 211 for first fixing.

[0044] In other embodiments, the surface of the cover plate 120 is further provided with an electrode post 311, a liquid injection through hole 312, and an explosion-proof valve 313. In still other embodiments, the protrusion 310 is recessed inward to form an indented groove 610, and a battery connecting piece 710 is provided in the indented groove 610 for connecting the positive and negative terminals of the battery and the positive and negative terminals of the cover plate.

[0045] Figure 5 This is an exemplary schematic diagram showing a cover plate 120 according to an embodiment of the present invention. Figure 5 As shown, the cover plate 120 has a boss 310, and a plurality of fixing buckles 210 are provided around the outer edge of the boss 310. The fixing buckles 210 correspond to the positions of a plurality of fixing holes 211 around the top edge of the Mylar membrane 110 after it covers the battery cell. As mentioned earlier, the size of the boss 310 corresponds to the top opening reserved after the Mylar membrane 110 covers the battery cell (e.g., the one described above). Figure 3 The top opening 800 shown is sized to fit the top. In this scenario, by covering the top opening with the cover plate 120 and pressing the cover plate 120 downwards, the protrusion 310 is embedded in the top opening to cover the top of the battery cell (e.g., as described above). Figure 4 As shown), the fixing buckle 210 is pressed into the fixing hole 211 for the first fixing, thus completing the fixing between the Mylar membrane and the cover plate.

[0046] The figure further shows that the cover plate 120 is also provided with a terminal post 311, a liquid injection through-hole 312, and an explosion-proof valve 313. It can be understood that there can be two terminals 311, including a positive terminal and a negative terminal of the battery, for battery conductivity. The liquid injection through-hole 312 serves as the inlet for filling the battery with liquid. The explosion-proof valve 313 serves as the primary entry point in case of a sudden battery problem.

[0047] Figure 6 This is yet another exemplary schematic diagram showing a cover plate 120 according to an embodiment of the present invention. Figure 6 As shown, the protrusion 310 of the cover plate 120 is recessed inward to form an indented groove 610, and two battery connecting pieces 710 are provided in the indented groove 610. These can be welded to connect the positive and negative terminals of the battery and the positive and negative terminals of the cover plate to transmit current. The shape of the battery connecting pieces shown in the figure is merely exemplary; for example, they can also be triangular, rectangular, etc., and this utility model does not impose any limitations in this regard.

[0048] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A Mylar film (110) for use in batteries, characterized in that, include: A first covering sheet (111), a second covering sheet (112), and a base support sheet (113) connecting the first covering sheet (111) and the second covering sheet (112); A first side covering piece (114) and a second side covering piece (115), wherein the first side covering piece (114) and the second side covering piece (115) are configured in pairs and are respectively foldably connected to any side of the first covering piece (111) and the second covering piece (112) adjacent to the bottom support piece (113); The first side covering sheet (114) and the second side covering sheet (115) have a fixing structure suitable for snap-fit ​​engagement, so as to fix the Mylar membrane (110) into a preset three-dimensional shape.

2. The Mylar membrane (110) according to claim 1, characterized in that, The fixing structure includes: The first side covering sheet (114) has a narrow, elongated hole (212); A protruding tongue (213) extending outward from the side of the second side covering piece (115) is correspondingly provided on the second side covering piece (115); Furthermore, the tongue (213) is adapted to be pressed into the elongated hole (212) for fixation.

3. The Mylar membrane (110) according to claim 1, characterized in that, The side of the base plate (113) may also be foldably connected to a pre-shaped notch covering piece (510), wherein the notch covering piece (510) is shaped to extend from the edge of the base plate (113) toward the center portion of the base plate (113) so as to cover the gap (410) when the Mylar film (110) is folded.

4. The Mylar membrane (110) according to claim 1, characterized in that, It also includes multiple fixing holes (211); The fixing holes (211) are arranged along the edge away from the base plate (113) on the first covering plate (111), the second covering plate (112), the first side covering plate (114), and the second side covering plate (115), respectively. After the Mylar membrane (110) is fixed into a preset three-dimensional shape, the fixing holes (211) are arranged around the top edge of the Mylar membrane (110).

5. A Mylar membrane assembly for a battery, characterized in that, include: A battery cell, a Mylar membrane (110) covering the battery cell as described in any one of claims 1 to 4, and a cover plate (120); The Mylar membrane (110) covers the battery cell with a top opening. The cover plate (120) is placed over the top opening to cover the top of the battery cell. The cover plate (120) is first fixed to the Mylar membrane (110) via the fixing buckle (210) on the cover plate (120) and the fixing hole (211) on the Mylar membrane (110), and second fixed via the elongated hole (212) and the protruding tongue (213) on the side of the Mylar membrane (110) to achieve the covering and fixing of the battery cell.

6. The Mylar membrane module according to claim 5, characterized in that, The first covering sheet (111) and the second covering sheet (112) are folded along their connection with the base plate (113) to cover the front and back of the battery cell, respectively; the first side covering sheet (114) and the second side covering sheet (115) are folded and overlapped along their connection with the first covering sheet (111) and the second covering sheet (112) to cover the side of the battery cell, so that the Mylar film (110) covers the battery cell and forms a preset three-dimensional shape.

7. The Mylar membrane module according to claim 5, characterized in that, The cover plate (120) has a boss (310) whose size is adapted to the top opening. After the cover plate (120) is placed over the top opening, the boss (310) is embedded in the top opening to cover the top of the battery cell.

8. The Mylar membrane module according to claim 5, characterized in that, The base plate (113) has a plurality of immersion holes (511) distributed thereon so that electrolyte can enter and wet the battery cell through the plurality of immersion holes (511).

9. The Mylar membrane assembly according to claim 5 or 7, characterized in that, The surface of the cover plate (120) is also provided with an electrode post (311), a liquid injection through hole (312) and an explosion-proof valve (313).

10. The Mylar membrane module according to claim 7, characterized in that, The boss (310) is recessed inward to form a recessed groove (610), and a battery connecting piece (710) is provided in the recessed groove (610). The battery connecting piece (710) is used to connect the positive and negative terminals of the battery and the positive and negative terminals of the cover plate.

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