Secondary battery and insulation assembly for secondary battery

Abstract

The utility model provides a secondary battery and an insulation assembly for the secondary battery. The secondary battery comprises an electrode assembly, the electrode assembly is provided with an electrode lug and an electrode assembly main body, the electrode lug is arranged on at least one end surface of the electrode assembly main body, and the electrode lug is provided with an arc-shaped edge; the current collecting piece is connected with the tab; and the insulating diaphragm at least covers the joint of the current collecting piece and the tab, and one side, far away from the electrode assembly main body, of the insulating diaphragm is provided with an arc-shaped boundary matched with the arc-shaped edge. According to the utility model, the problem that the welding effect of the current collecting piece and the pole is influenced due to the fact that the insulating diaphragm intrudes into the welding surface of the pole to form a laser welding burst point in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, specifically, relate to a secondary battery and be used for the insulation subassembly of secondary battery. BACKGROUND

[0002] The secondary battery usually includes a shell and an electrode assembly contained in the shell, wherein the shell includes a casing and a cover plate, and the tab on the electrode assembly is electrically connected to the pole post on the shell through the current collector. The tab of the electrode assembly is formed by die cutting the hollow foil area on the pole piece. In the early stage, the die cutting process mainly uses metal cutter dies for cutting. The obtained tab shape is usually rectangular or trapezoidal. In order to completely cover the tab, the corresponding insulation film piece (such as insulation tape) for insulating protection of the tab is usually rectangular. With the progress of the process, the metal cutter dies are replaced by laser die cutting. The application of laser die cutting technology can arbitrarily change the shape of the tab. The commonly used design is a tab with an arc-shaped edge. On this basis, the straight edge of the rectangular insulation film piece occupies the surface area of the current collector. When the current collector and the pole post are laser welded, the insulation film piece may occupy the pole post welding surface (the surface for laser welding with the pole post) of the current collector, resulting in laser welding spatter and affecting the welding effect of the current collector and the pole post. SUMMARY

[0003] The main purpose of the utility model is to provide a secondary battery and an insulation subassembly for the secondary battery, so as to solve the problem of laser welding spatter caused by the intrusion of the insulation film piece into the pole post welding surface and affecting the welding effect of the current collector and the pole post in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a secondary battery is provided, which includes: an electrode assembly, the electrode assembly having a tab and an electrode assembly body, the tab being arranged on at least one end face of the electrode assembly body, the tab having an arc-shaped edge; a current collector, the current collector being connected to the tab; and an insulation film piece, the insulation film piece covering at least the connection between the current collector and the tab, and the side of the insulation film piece away from the electrode assembly body having an arc-shaped boundary matched with the arc-shaped edge.

[0005] Further, the tab and the current collector are welded and connected to form a welding mark, and the welding mark is attached with the insulation film piece on both sides.

[0006] Further, the arc-shaped edge is two, the side of the tab away from the electrode assembly body further has a straight edge, and the straight edge is located between the two arc-shaped edges; and / or, the arc-shaped boundary is two, the side of the insulation film piece away from the electrode assembly body further has a straight boundary, and the straight boundary is located between the two arc-shaped boundaries.

[0007] Further, the arc-shaped boundary is a circular arc, and the radius R of the circular corner of the arc-shaped boundary and the width W of the insulation film piece satisfy 0.5mm≤R≤W.

[0008] Further, the electrode assemblies and the current collectors are both plural, the current collector has plural connecting arms, and the current collector is connected to the same-polarity tabs of different electrode assemblies through different connecting arms.

[0009] According to another aspect of the present application, an insulation assembly for a secondary battery is provided, comprising: an insulation film, the insulation film comprising plural sequentially connected insulation film pieces, the insulation film pieces having arc-shaped boundaries cooperating with arc-shaped edges of electrode assembly tabs.

[0010] Further, the insulation film pieces comprise opposite first and second sides, the first side of one insulation film piece is connected to the second side of another insulation film piece among adjacent two insulation film pieces, and the arc-shaped boundaries are located at the first side of the insulation film piece.

[0011] Further, the insulation film has positioning holes for cutting positioning.

[0012] Further, the cutting track lines of adjacent two insulation film pieces are arranged in dislocation with the positioning holes, the positioning holes are located at a side of the insulation film piece away from the arc-shaped boundaries; or the cutting track lines of adjacent two insulation film pieces pass through the positioning holes.

[0013] Further, the insulation assembly further comprises a bottom film, and the insulation film is detachably attached to the bottom film.

[0014] By means of the present application, the arc-shaped edges are arranged on the tabs, and the arc-shaped boundaries cooperating with the arc-shaped edges are correspondingly arranged on the insulation film pieces, so that the insulation film pieces can completely cover the connection between the current collector and the tab, and the insulation film pieces avoid the welding space between the current collector and the pole by means of the arc-shaped boundaries of the insulation film pieces, thereby avoiding the situation that the insulation film pieces intrude into the laser welding spot of the pole, ensuring that the insulation film pieces can be stably and reliably attached to the connection between the current collector and the tab, and ensuring the welding quality between the current collector and the pole, and further ensuring the quality of the secondary battery as a whole. Moreover, the design of the arc-shaped boundaries of the insulation film pieces also reduces the waste of materials and saves the cost of raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the application. The use of the same reference symbols in different drawings and / or the use of similar reference symbols in the drawings designates similar or identical components.

[0016] Figure 1 A structure schematic view of the secondary battery of the present application is shown;

[0017] Figure 2 A top view of Figure 1 is shown;

[0018] Figure 3 An exploded view of the battery is shown; Figure 1

[0019] Figure 4 A structural schematic view of the current collector of the battery is shown; Figure 1

[0020] A structural schematic view of the insulating assembly of the utility model is shown; Figure 5

[0021] A top view of the battery is shown. Figure 6 Figure 5

[0022] Wherein, the above-mentioned drawings include the following reference signs:

[0023] 10, electrode assembly; 11, tab; 12, electrode assembly body; 13, arc-shaped edge; 14, straight edge; 20, current collector; 21, connecting arm; 30, insulating film; 31, first insulating film; 32, second insulating film; 33, positioning hole; 34, arc-shaped boundary; 40, bottom film; 50, insulating film. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0026] In the utility model, unless otherwise stated, the orientation words such as "up, down, top, bottom" are generally for the direction shown in the drawings, or for the components themselves in the vertical, perpendicular or gravity direction; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the utility model.

[0027] In order to solve the problem that the insulating film in the prior art invades the welding surface of the pole to form a laser welding spot, affecting the welding effect of the current collector and the pole, the utility model provides a secondary battery and an insulating assembly for the secondary battery.

[0028] As Figures 1 to 4 ​​​The secondary battery shown comprises an electrode assembly 10, a current collector 20 and an insulating film 30, the electrode assembly 10 has a tab 11 and an electrode assembly body 12, the tab 11 is arranged at at least one end face of the electrode assembly body 12, the tab 11 has an arc-shaped edge 13; at least one surface of the current collector 20 is connected with the tab 11; the insulating film 30 covers at least the connection between the current collector 20 and the tab 11, and the side of the insulating film 30 away from the electrode assembly body 12 has an arc-shaped boundary 34 matched with the arc-shaped edge 13. Wherein, the matching means that the shape of the arc-shaped boundary 34 is basically the same as the shape of the arc-shaped edge 13, the arc-shaped boundary 34 can cover the current collector 20 beyond the arc-shaped edge 13, or can coincide with the arc-shaped edge 13.

[0029] In this embodiment, the arc-shaped edge 13 is arranged on the tab 11, and the arc-shaped boundary 34 matched with the arc-shaped edge 13 is arranged on the insulating film 30 correspondingly, so that the insulating film 30 can completely cover the connection between the current collector 20 and the tab 11, and the arc-shaped boundary 34 of the insulating film 30 avoids the welding space between the current collector 20 and the pole, so as to avoid the situation that the insulating film 30 invades the laser welding spot of the pole welding surface, and ensure that the insulating film 30 can be stably and reliably attached to the connection between the current collector 20 and the tab 11, and the welding quality between the current collector 20 and the pole is ensured, and the quality of the whole secondary battery is ensured. Moreover, the design of the arc-shaped boundary 34 of the insulating film 30 also reduces the waste of materials and saves the cost of raw materials.

[0030] As shown in Figure 3 Optionally, the whole or part of the end of the tab 11 extending out of the end of the electrode assembly body 12 can be designed with a rounded corner, and correspondingly, the end edge of the insulating film 30 is also designed with a rounded corner corresponding to the whole or part, so that the arc-shaped edge 13 and the arc-shaped boundary 34 are completely aligned, and the arc-shaped edge 13 and the arc-shaped boundary 34 can both avoid welding of the pole, so as to ensure the effect of avoiding welding.

[0031] The end portion of the tab 11 extending out of the electrode assembly body 12 is designed with a rounded transition, so that the tab 11 has a straight edge 14 in addition to the arc-shaped edges 13 on the side away from the electrode assembly body 12, and the straight edge 14 is located between the two arc-shaped edges 13, so that the end of the tab 11 forms a structure of one arc-shaped edge 13, a straight edge 14, and another arc-shaped edge 13. Correspondingly, the side of the insulating film 30 away from the electrode assembly body 12 can also have two arc-shaped boundaries 34 and a straight boundary located between the two arc-shaped boundaries 34, which can both avoid the welding space between the current collector 20 and the pole and cover the connection between the current collector 20 and the tab 11, achieving the dual effects of full coverage and welding avoidance. The form of the boundaries of the insulating film 30 is basically the same as that of the edges of the tab 11, and the arc-shaped boundaries 34 and the arc-shaped edges 13 can both be designed as circular arcs.

[0032] Preferably, the radius R of the arc-shaped boundary 34 and the width W of the insulating film 30 of the present embodiment satisfy 0.5mm≤R≤W, so that the arc-shaped boundary 34 forms a large rounded transition, which can effectively avoid the welding space between the current collector 20 and the pole and facilitate processing and molding. The total thickness of the insulating film 30 of the present embodiment is 0.001mm~1mm. Specifically, the insulating film 30 can be an adhesive tape.

[0033] The insulating film 30 of the present embodiment is multiple, and will form a welding mark when the tab 11 is welded to the current collector 20, and the insulating film 30 is attached on both sides of the welding mark. Based on the different positions of the tab 11 on the end face of the electrode assembly body 12, the shape of the insulating film 30 when attached is also not completely the same. The end face of the electrode assembly body 12 of the present embodiment has opposite first and second edges, i.e. Figure 3 The lower edge of the left end face of the middle right electrode assembly body 12 is the first edge, and the upper edge is the second edge. The tab 11 of the present embodiment is arranged at the first edge, and the insulating film 30 includes a first insulating film 31 and a second insulating film 32. When the insulating film 30 is attached, the first insulating film 31 is located at the first edge, so that the first insulating film 31 can be designed in a straight sheet form, so that the first insulating film 31 can directly transition from the side of the electrode assembly body 12 to the tab 11 without needing to be bent. Unlike the first insulating film 31, the second insulating film 32 of the present embodiment extends from the second edge to the first edge. Since the side of the electrode assembly body 12, the end face of the electrode assembly body 12, and the tab 11 form a two-stage stepped form, the second insulating film 32 is designed in a bent form.

[0034] Specifically, the second insulating film sheet 32 of the embodiment includes a first section, a second section and a third section connected in sequence, wherein the bending directions of the first section and the third section are opposite to that of the second section, and the first section and the third section form a Z-shaped structure, the first section is attached to the side surface of the electrode assembly body 12, the second section is attached to the end surface of the electrode assembly body 12, and the third section is attached to the surface of the welding mark at the connection between the tab 11 and the current collector 20, so that the second insulating film sheet 32 can extend from the second edge to the first edge and be attached to the end surface of the electrode assembly body 12, the surface of the tab 11 and the like, thereby ensuring the attachment quality of the second insulating film sheet 32. Based on the above form, since the third section is attached to the surface of the welding mark, the second insulating film sheet 32 has an arc-shaped boundary 34 at the edge of the third section away from the first section, so that the third section can be adapted to the shape of the tab 11, thereby achieving the effect of avoiding welding.

[0035] Of course, the setting position of the tab 11 can also be adjusted as needed, and the tab 11 can be arranged at the end surface of the electrode assembly body 12 and located between the first edge and the second edge, at this time, both the first insulating film sheet 31 and the second insulating film sheet 32 can adopt the form of being arranged in a Z-shaped structure by being bent. It should be noted that the structural form of the first insulating film sheet 31 and the second insulating film sheet 32 described above can be an intermediate state in the process of battery processing, or a final state after the battery processing is completed, and the specific presentation form of the first insulating film sheet 31 and the second insulating film sheet 32 is not limited to the above content of the embodiment, which can be adjusted.

[0036] The insulating film sheet 30 of the embodiment has at least partial positioning holes 33, and for the whole insulating assembly, the positioning holes 33 are relatively complete on the insulating film 50, and the positioning holes 33 are used for positioning when the insulating film sheet 30 is cut. When it is needed to attach the insulating film sheet 30 to the tab 11, the insulating film 50 is cut, and the cutting position is positioned by the positioning holes 33 when cutting, so as to form the insulating film sheet 30 with stable quality, and then the insulating film sheet 30 can be transferred and attached to the tab 11. The setting of the positioning holes 33 can avoid the problem of unequal length in cutting, ensure the cutting quality of the insulating film sheet 30, and further ensure the processing quality of the secondary battery. When the cutting track line passes through the positioning holes 33, the positioning holes 33 on the insulating film sheet 30 are incomplete, and when the cutting track line does not pass through the positioning holes 33, the positioning holes 33 on the insulating film sheet 30 are complete.

[0037] As Figure 1 and Figure 2As shown, in the embodiment, in addition to the plurality of insulating film pieces 30, the electrode assembly 10 and the current collector 20 can also be multiple, and the embodiment takes the example that the electrode assembly 10 is provided with two, and the current collector 20 is provided with two, wherein the electrode assembly bodies 12 of the two electrode assemblies 10 are respectively provided with two tab electrodes 11 on the end faces close to each other, which are respectively used as positive and negative tab electrodes, so that there are two positive and two negative tab electrodes in total, and the current collector 20 has multiple connecting arms 21, and since the positive and negative tab electrodes in the embodiment are both two, the connecting arms 21 of each current collector 20 are also provided with two, and the two connecting arms 21 are connected together, so that the current collector 20 as a whole forms a V-shaped structure, as shown in Figure 4 When the current collector 20 is welded with the tab electrodes 11, the current collector 20 is connected with the tab electrodes 11 of the same polarity on different electrode assemblies 10 through different connecting arms 21 and forms a welding mark, that is, the two connecting arms 21 of one current collector 20 are respectively welded with the positive tab electrodes of the two electrode assemblies 10, and the two connecting arms 21 of the other current collector 20 are respectively welded with the negative tab electrodes of the two electrode assemblies 10, so that the positive tab electrodes are simultaneously welded with the same current collector 20, and the negative tab electrodes are simultaneously welded with the other current collector 20, and then welded with the external pole and other components through the respective current collectors 20, thereby playing a role of unified connection to the outside. Of course, the specific structure and arrangement mode of the current collector 20 can be adjusted according to the arrangement mode of the electrode assembly 10 and the tab electrodes 11 thereof, and is not limited to the form described above in the embodiment.

[0038] The current collector 20 in the embodiment forms a welding area for welding with the pole between the two connecting arms 21, that is, the circular area in Figure 4 , and the pole is welded at the welding area, thereby realizing the connection between the current collector 20 and the pole. The round corner design of the insulating film piece 30 avoids the welding area, so that the insulating film piece 30 does not block the welding area, thereby ensuring the stable and reliable welding between the pole and the current collector 20.

[0039] As shown in Figure 5 and Figure 6As shown, the embodiment also provides an insulation assembly for the secondary battery, which comprises an insulation film 50, the insulation film 50 comprises a plurality of insulation film pieces 30 connected in sequence, the insulation film piece 30 has an arc-shaped boundary 34 matched with the arc-shaped edge 13 of the tab 11 of the electrode assembly 10. The insulation film 50 can be cut into a plurality of insulation film pieces 30, and the insulation film piece 30 can be transported to the tab 11 for the bonding operation by a suction nozzle negative pressure pickup device or the like. As described above, the embodiment sets the insulation film piece 30 in the form of a rounded corner of the arc-shaped boundary 34, so that the insulation film piece 30 avoids the welding space between the current collector 20 and the pole, avoids the situation that the insulation film piece 30 invades the laser welding spot of the pole welding surface, ensures that the insulation film piece 30 can be stably and reliably attached to the connection between the current collector 20 and the tab 11, ensures the welding quality, reduces the waste of materials, and saves the cost of raw materials.

[0040] In the embodiment, the insulation film piece 30 comprises opposite first and second sides, and in adjacent two insulation film pieces 30, the first side of one insulation film piece 30 is connected with the second side of the other insulation film piece 30, so that the insulation film pieces 30 are connected in sequence in the order of the first side, the second side, and the first side. When cutting, the cutting knife can cut and separate the two insulation film pieces 30 through the connection between the first and second sides of the two insulation film pieces 30. In the embodiment, the arc-shaped boundary 34 is arranged at the first side of the insulation film piece 30, so that the shape of the insulation film piece 30 is matched with the tab 11.

[0041] In the embodiment, the insulation film 50 has a positioning hole 33 for cutting positioning. In this way, when cutting, the cutting device can position the cutting position through the positioning hole 33, so that the cutting knife can stably and reliably cut the insulation film piece 30, and ensure the cutting effect. The shape of the positioning hole 33 can be set as needed, and can be circular, square, or the like.

[0042] In the embodiment, the positioning hole 33 is arranged between each adjacent two insulation film pieces 30, and the positioning hole 33 is arranged at intervals along the length direction of the insulation film 50, so that the cut insulation film pieces 30 are equal in length, and the consistency of the cut insulation film 50 is ensured.

[0043] Optionally, the positioning hole 33 can be arranged at a specific position of the insulation film 50 as required, the positioning hole 33 can be arranged staggered with the cutting track lines of the adjacent two insulation film pieces 30, and at this time, the positioning hole 33 can be located at a side of the insulation film piece 30 away from the arc-shaped boundary 34. Since the cutting track line is usually arranged along the joint of the two insulation film pieces 30, by the above arrangement, the part of the insulation film piece 30 used for covering the joint of the current collector 20 and the tab 11 does not have the positioning hole 33, thereby ensuring the full coverage of the joint of the current collector 20 and the tab 11. Alternatively, the cutting track lines of the adjacent two insulation film pieces 30 can pass through the positioning hole 33, so that the cutting knife passes through the positioning hole 33 when cutting the insulation film 50, so that the insulation film piece 30 after cutting has a part of a complete positioning hole 33 respectively. In this case, the positioning holes 33 on the two insulation film pieces 30 can be uniformly distributed or non-uniformly distributed, that is, the cutting track line can pass through the center of the positioning hole 33 or can not pass through the center of the positioning hole 33 when passing through the positioning hole 33.

[0044] The insulation assembly of the embodiment further comprises a bottom film 40, and the insulation film 50 is detachably attached to the bottom film 40. The bottom film 40 can play a role in separating the insulation film 50, avoiding the case that the insulation film 50 is directly contacted and bonded together when being wound into a roll.

[0045] The insulation film 50 of the embodiment is in the form of plastic plus glue, wherein the plastic can be polyethylene terephthalate (PET) plastic, polyimide (PI) plastic, polypropylene (PP) plastic, polyethylene (PE) plastic, etc., and the glue can be pressure-sensitive glue, etc. The bottom film 40 of the insulation assembly is a release film, so that the whole insulation assembly is bubble-free, thereby making the bonding effect of the insulation film piece 30 to the tab 11 better and solving the problem of easy falling off.

[0046] It should be noted that the plurality in the above embodiment means at least two.

[0047] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0048] 1. The problem that the insulation assembly in the prior art invades the welding surface of the pole to form a laser welding spot and affects the welding effect of the current collector and the pole is solved;

[0049] 2. The welding quality between the current collector and the pole is ensured, and the quality of the secondary battery as a whole is ensured;

[0050] 3. The waste of materials is reduced, and the cost of raw materials is saved.

[0051] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0052] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", and the like, used in the specification and in the claims of the present application are intended to distinguish analogous objects, and are not necessarily intended to describe a particular sequential or chronological order. It will be understood that the data so used can be interchanged, where appropriate, to refer to any one of the embodiments of the present application described herein, in any order.

[0054] The preferred embodiments of the present application have been described above with the specific details. Obviously, the present application can be modified and altered in various ways by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A secondary battery characterized by comprising: The electrode assembly (10) has a tab (11) and an electrode assembly body (12), the tab (11) is arranged on at least one end surface of the electrode assembly body (12), and the tab (11) has an arc-shaped edge (13). The current collector (20) is connected with the tab (11). The insulating film (30) covers at least the connection between the current collector (20) and the tab (11), and the side of the insulating film (30) away from the electrode assembly body (12) has an arc-shaped boundary (34) matched with the arc-shaped edge (13). There are multiple insulating films (30), and the tab (11) and the current collector (20) are welded to form a welding mark, and the welding mark is attached with the insulating film (30) on both sides.

2. The secondary battery according to claim 1, characterized by The arc-shaped edge (13) is two, and the side of the tab (11) away from the electrode assembly body (12) further has a straight edge (14) located between the two arc-shaped edges (13); and / or, the arc-shaped boundary (34) is two, and the side of the insulating film (30) away from the electrode assembly body (12) further has a straight boundary located between the two arc-shaped boundaries (34).

3. The secondary battery according to claim 1, characterized by The arc-shaped boundary (34) is a circular arc, and the radius R of the arc-shaped boundary (34) and the width W of the insulating film (30) satisfy 0.5mm≤R≤W.

4. The secondary battery according to claim 3, characterized by The electrode assembly (10) and the current collector (20) are multiple, the current collector (20) has multiple connecting arms (21), and the current collector (20) is connected with the tabs (11) of the same polarity on different electrode assemblies (10) through different connecting arms (21).

5. The secondary battery according to claim 1, characterized by The insulating film (50) includes multiple insulating films (30) connected in sequence, and the insulating film (30) has an arc-shaped boundary (34) matched with the arc-shaped edge (13) of the tab (11) of the electrode assembly (10).

6. An insulating assembly for a secondary battery, characterized by, The insulating film (30) includes opposite first and second sides, and the first side of one insulating film (30) is connected with the second side of another insulating film (30) between two adjacent insulating films (30), and the arc-shaped boundary (34) is located at the first side of the insulating film (30). The insulating film (50) has a positioning hole (33) for cutting positioning.

7. The insulating assembly of claim 6, wherein, 9. The insulating assembly according to claim 8, wherein, 8. The insulating assembly of claim 6, wherein, the cutting track lines of two adjacent insulating films (30) are arranged in a staggered manner with the positioning hole (33), and the positioning hole (33) is located on the side of the insulating film (30) away from the arc-shaped boundary (34); or the cutting track lines of two adjacent insulating films (30) pass through the positioning hole (33). The insulating assembly further includes a bottom film (40), and the insulating film (50) is detachably attached to the bottom film (40). ​ 10. The insulating assembly of claim 6, wherein, ​

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