Insulating film assembly and battery device

Abstract

The present disclosure relates to the technical field of batteries, and specifically to an insulating film assembly and a battery device. The insulating film assembly comprises a first insulating film and a second insulating film, the first insulating film is provided with a first buffer through hole; the first insulating film and the second insulating film are oppositely arranged, the second insulating film is provided with a second buffer through hole, the orthographic projection of the second buffer through hole on the first insulating film and the first buffer through hole do not have an overlapping area; the first insulating film is further provided with a first buffer groove, the first buffer groove and the first buffer through hole are in communication, the second insulating film is further provided with a second buffer groove, the second buffer groove and the second buffer through hole are in communication, and the orthographic projection area of the second buffer groove on the first insulating film at least partially overlaps with the first buffer groove. The buffer performance of the insulating film assembly and the safety performance of the battery device can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to an insulating film assembly and a battery device. Background Technology

[0002] With technological advancements, electric vehicles are becoming increasingly widespread. Electric vehicles are equipped with battery packs that store electrical energy and power the vehicle. A battery pack may contain multiple batteries, which can expand during use. Insulating film assemblies are located on the top surface of the batteries; these assemblies are at risk of tearing when the batteries expand.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this disclosure is to provide an insulating film assembly and a battery device, thereby improving the safety of the battery device to a certain extent.

[0005] According to one aspect of this disclosure, an insulating film assembly is provided, the insulating film assembly comprising:

[0006] A first insulating film, wherein a first buffer through-hole is provided in the first insulating film;

[0007] A second insulating film is disposed opposite to the first insulating film. A second buffer through-hole is provided in the second insulating film. The orthographic projection of the second buffer through-hole on the first insulating film and the first buffer through-hole do not overlap. A single-layer film structure is formed in the first orthographic projection area on the first insulating film and in the second orthographic projection area on the second insulating film. The first orthographic projection area is the orthographic projection area of ​​the second buffer through-hole in the first insulating film, and the second orthographic projection area is the orthographic projection area of ​​the first buffer through-hole in the second insulating film.

[0008] A conductive layer is disposed between the first insulating film and the second insulating film, and the conductive layer includes a busbar;

[0009] The first insulating film is further provided with a first buffer groove, which is located on the side of the first buffer through hole near the first orthographic projection area and is connected to the first buffer through hole. The second insulating film is further provided with a second buffer groove, which is located on the side of the second buffer through hole near the second orthographic projection area and is connected to the second buffer through hole. The orthographic projection area of ​​the second buffer groove on the first insulating film at least partially coincides with the first buffer groove. The orthographic projections of the first buffer groove and the second buffer groove on the conductive layer at least partially do not coincide with the conductive layer. The orthographic projections of the first buffer through hole and the second buffer through hole on the conductive layer at least partially do not coincide with the conductive layer.

[0010] According to a second aspect of this disclosure, a battery device is provided, the battery device comprising the insulating film assembly described above.

[0011] The insulating film assembly provided in this embodiment has a first buffer through-hole in the first insulating film and a second buffer through-hole in the second insulating film. The projection of the second buffer through-hole onto the first insulating film and the first buffer through-hole do not overlap, thus forming a single-layer film area on the insulating film assembly. The single-layer film has high flexibility and is easily torn, providing good buffering effect, thereby improving the safety of the battery device. Furthermore, the first buffer groove and the second buffer groove provided between the first buffer through-hole and the second buffer through-hole can guide the tearing direction, making it easier to control the tearing direction of the insulating film assembly. It can also reduce the area of ​​the holes on the insulating film assembly, preventing foreign objects from entering the battery device or the insulating film assembly.

[0012] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0014] Figure 1 A schematic diagram of an insulating film assembly provided for an exemplary embodiment of this disclosure;

[0015] Figure 2 An exploded view of an insulating film assembly provided as an exemplary embodiment of this disclosure;

[0016] Figure 3A schematic diagram of a first insulating film provided for an exemplary embodiment of this disclosure;

[0017] Figure 4 A partial enlarged view of a first insulating film provided as an exemplary embodiment of this disclosure;

[0018] Figure 5 A partial enlarged view of the second type of first insulating film provided for an exemplary embodiment of this disclosure;

[0019] Figure 6 A partial enlarged view of the third type of first insulating film provided for an exemplary embodiment of this disclosure;

[0020] Figure 7 A partial enlarged view of the fourth type of first insulating film provided for an exemplary embodiment of this disclosure;

[0021] Figure 8 A schematic diagram of a second insulating film provided for an exemplary embodiment of this disclosure;

[0022] Figure 9 A partial enlarged view of a first type of second insulating film provided for an exemplary embodiment of this disclosure;

[0023] Figure 10 A partially enlarged view of a second type of second insulating film provided as an exemplary embodiment of this disclosure;

[0024] Figure 11 A partial enlarged view of the third type of second insulating film provided for an exemplary embodiment of this disclosure;

[0025] Figure 12 A partial enlarged view of a fourth type of second insulating film provided as an exemplary embodiment of this disclosure;

[0026] Figure 13 A schematic diagram of another first insulating film provided for an exemplary embodiment of this disclosure;

[0027] Figure 14 A partial enlarged view of the fifth type of first insulating film provided for an exemplary embodiment of this disclosure;

[0028] Figure 15 A schematic diagram of another second insulating film provided for an exemplary embodiment of this disclosure;

[0029] Figure 16 A partial enlarged view of the fifth type of second insulating film provided for an exemplary embodiment of this disclosure;

[0030] Figure 17 A partial schematic diagram of an insulating film assembly provided for an exemplary embodiment of this disclosure;

[0031] Figure 18A schematic diagram of a battery module provided for an exemplary embodiment of this disclosure;

[0032] Figure 19 A schematic diagram of a battery provided for an exemplary embodiment of this disclosure;

[0033] Figure 20 This is a schematic diagram of a battery pack provided for an exemplary embodiment of the present disclosure. Detailed Implementation

[0034] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0035] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” means two or more; and the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0036] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] In electric vehicles, energy is typically provided by a battery pack, which consists of multiple batteries stacked sequentially. During battery use, as the batteries age, they expand. This expansion can cause other components connected to the battery, such as insulating film assemblies, to tear.

[0038] Exemplary embodiments of this disclosure also provide an insulating film assembly 10, such as Figure 1 , Figure 3 , Figure 4 Figure 8 and Figure 9As shown, the insulating film assembly 10 includes: a first insulating film 110, a second insulating film 120 and a conductive layer 200. The first insulating film 110 is provided with a first buffer through hole 111. The first insulating film 110 and the second insulating film 120 are disposed opposite to each other. The conductive layer 200 is disposed between the first insulating film 110 and the second insulating film 120. The conductive layer includes a busbar 210. A second buffer through-hole 121 is provided in the second insulating film 120. The orthographic projection of the second buffer through-hole 121 on the first insulating film 110 and the first buffer through-hole 111 do not overlap, so that a single-layer film structure is formed in the first orthographic projection area 113 on the first insulating film 110 and a single-layer film structure is formed in the second orthographic projection area 123 on the second insulating film 120. A first buffer groove 112 is also provided on the first insulating film 110. The first buffer groove 112 is located on the side of the first buffer through-hole 111 near the first orthographic projection area 113, and the first buffer groove 112 and the first buffer through-hole 111 are connected. The first orthographic projection area 113 is the orthographic projection area of ​​the second buffer through-hole 121 in the first insulating film 110. The insulating film 120 is also provided with a second buffer groove 122. The second buffer groove 122 is located on the side of the second buffer through hole 121 near the second orthographic projection area 123, and the second buffer groove 122 and the second buffer through hole 121 are connected. The second orthographic projection area 123 is the orthographic projection area of ​​the first buffer through hole 111 in the second insulating film 120. The orthographic projection area of ​​the second buffer groove 122 on the first insulating film 110 at least partially coincides with the first buffer groove 112. The orthographic projections of the first buffer groove 112 and the second buffer groove 122 on the surface of the conductive layer 200 at least partially do not coincide with the conductive layer 200. The orthographic projections of the first buffer through hole 111 and the second buffer through hole 121 on the surface of the conductive layer 200 at least partially do not coincide with the conductive layer 200.

[0039] The insulating film assembly 10 provided in this embodiment has a first buffer through-hole 111 in the first insulating film 110 and a second buffer through-hole 121 in the second insulating film 120. The orthographic projection of the second buffer through-hole 121 on the first insulating film 110 and the first buffer through-hole 111 do not overlap, so that a single-layer film area is formed on the insulating film assembly. The single-layer film has high flexibility and is easy to tear, with good buffering effect, thereby improving the safety of the battery device. Furthermore, the first buffer groove 112 and the second buffer groove 122 provided between the first buffer through-hole 111 and the second buffer through-hole 121 can guide the tearing direction, making it easier to control the tearing direction of the insulating film assembly, and can reduce the area of ​​the holes on the insulating film assembly, preventing foreign objects from entering the battery device or the insulating film assembly.

[0040] Furthermore, such as Figure 2As shown, the insulating film assembly provided in this embodiment may further include a conductive layer 200, which is disposed between the first insulating film 110 and the second insulating film 120. The conductive layer 200 also includes a circuit board 220, and the second buffer through hole 121 is located at one end of the second orthographic projection area 123 away from the circuit board 220, and / or the second buffer through hole 121 is located at one end of the second orthographic projection area 123 close to the circuit board 220.

[0041] The following will describe in detail the various parts of the insulating film assembly provided in the embodiments of this disclosure:

[0042] The first insulating film 110 and the second insulating film 120 are disposed opposite to each other and are connected by hot pressing. A conductive layer 200 is disposed between the first insulating film 110 and the second insulating film 120. The conductive layer 200 may include a circuit board 220 and a bus 210. The circuit board 220 is covered by the first insulating film 110 and the second insulating film 120. The portion of the bus 210 connected to the battery is exposed to the first insulating film 110 and the second insulating film 120. That is, the first insulating film 110 and the second insulating film 120 have openings at the connection points of the bus 210.

[0043] The first insulating film 110 can be a hot-pressed insulating film, and the second insulating film 120 can be a hot-pressed insulating film. The first insulating film 110 and the second insulating film 120 can be pressed together with the busbar 210 and the circuit board 220 through a hot-pressing process to form an insulating film assembly 10. For example, the material of the hot-pressed film can be one or more of polyethylene terephthalate (PET), polyethylene terephthalate-polyethylene glycol (PETG), thermoplastic polyurethane (TPU), polycarbonate (PC), and polypropylene (PP).

[0044] In one feasible implementation, such as Figure 4 As shown, a first spacing region 114 is provided in the first insulating film 110. The first spacing region 114 is located between the first buffer through hole 111 and the first orthographic projection region 113, and the first buffer groove 112 is at least partially located in the first spacing region 114; Figure 9 As shown, a second spacer region 124 is provided in the second insulating film 120. The second spacer region 124 is located between the second buffer through hole 121 and the second orthographic projection region 123. The second buffer groove 122 is at least partially located in the second spacer region 124. The first spacer region 114 and the second spacer region 124 can be connected by means of heat pressing or the like.

[0045] For example, the width of the first interval 114 can be 1-3 mm, that is, the distance between the first buffer through hole 111 and the first orthographic projection area 113 is 1-3 mm. The width of the second interval 114 can be 1-3 mm, that is, the distance between the second buffer through hole 111 and the second orthographic projection area 113 is 1-3 mm.

[0046] By providing a first interval region 114 between the first buffer through-hole 111 and the first orthographic projection area 113, and a second interval region 124 between the second buffer through-hole 121 and the second orthographic projection area 123, a double-layer film is formed in the overlapping area. A third buffer through-hole 11 is formed in this double-layer film area through the first buffer groove 112 and the second buffer groove 122, which guides the direction of the buffer tear and facilitates control of the tear direction. Furthermore, the first interval region 114 and the second interval region 124 connect the first insulating film 110 and the second insulating film 120, preventing foreign objects from entering the battery device between the first insulating film 110 and the second insulating film 120.

[0047] The first buffer through-hole 111 can be a through-hole on the first insulating film 110, such as a rectangular hole, an elliptical hole, a round hole, or an irregularly shaped hole on the first insulating film 110. The second buffer through-hole 121 can be a through-hole on the second insulating film 120, such as a rectangular hole, an elliptical hole, a round hole, or an irregularly shaped hole on the second insulating film 120.

[0048] For example, the first buffer through-hole 111 is a rectangular hole on the first insulating film 110, and the second buffer through-hole 121 is a rectangular hole on the second insulating film 120. The first buffer through-hole 111 and the second buffer through-hole 121 have the same width. On the first insulating film 110, the first buffer through-hole 111 is located at one end of the first orthographic projection area 113, that is, the first buffer through-hole 111 and the second buffer through-hole 121 are arranged along the length direction of the first buffer through-hole 111. At this time, the first interval area 114 and the second interval area 124 are both rectangular, and the orthographic projections of the first interval area 114 and the second interval area 124 overlap, forming a double-layer overlapping area.

[0049] The end of the first buffer groove 112 is projected onto the second insulating film 120 and located in the second buffer groove 122 or the second buffer through hole 121. The end of the first buffer groove 112 is the end of the first buffer groove 112 that is away from the first buffer through hole 111.

[0050] Wherein, the end of the first buffer groove 112 is orthogonally projected onto the second insulating film 120 and located in the second buffer through hole 121 means that the first buffer groove 112 can extend from the edge of the first buffer through hole 111 near the first orthogonal projection area 113 to the edge of the first interval area 114 away from the first buffer through hole 111 or extend to the first orthogonal projection area 113.

[0051] The end of the second buffer groove 122 is projected onto the first insulating film 110 and located in the first buffer groove 112 or the first buffer through hole 111. The end of the second buffer groove 122 is the end of the second buffer groove 122 that is away from the second buffer through hole 121.

[0052] Wherein, the end of the second buffer groove 122 is orthogonally projected onto the first insulating film 110 and located at the first buffer through hole 111 means that the second buffer groove 122 can extend from the edge of the second buffer through hole 121 near the edge of the second orthogonal projection area 123 to the edge of the second interval area 124 away from the edge of the second buffer through hole 121 or extend to the second orthogonal projection area 123.

[0053] In another feasible embodiment of this disclosure, the edge of the first buffer through-hole 111 in the first insulating film 110 coincides with the edge of the first orthographic projection area 113; the edge of the second buffer through-hole 121 in the second insulating film 120 coincides with the edge of the second orthographic projection area 123. That is, in the insulating film assembly, the first buffer through-hole 111 and the second buffer through-hole 121 are complementary.

[0054] The first buffer groove 112 is located at the edge of the first buffer through hole 111 near the first orthographic projection area 113, and the second buffer groove 122 is located at the edge of the second buffer through hole 121 near the second orthographic projection area 123. At this time, the orthographic projection of the first buffer groove 112 on the second insulating film 120 and the edge of the second buffer groove 122 coincide, and the first buffer groove 112 and the second buffer groove 122 form the third buffer through hole 11.

[0055] The first buffer groove 112 is projected onto the second insulating film 120 within the second buffer through hole 121, and the second buffer groove 122 is projected onto the first insulating film 110 within the first buffer through hole 111. That is, through holes are formed at the first buffer groove 112 and the second buffer groove 122 to penetrate the insulating film assembly. These through holes are used to guide the tearing direction when the insulating film assembly is torn.

[0056] The first buffer groove 112 can be disposed at the edge of the first buffer through hole 111 near the edge of the first orthographic projection area 113, and the first buffer groove 112 penetrates the first insulating film 110. The width of the first buffer groove 112 is smaller than the width of the first buffer through hole 111. The second buffer groove 122 can be disposed at the edge of the second buffer through hole 121 near the edge of the second orthographic projection area 123, and the second buffer groove 122 penetrates the second insulating film 120. The width of the second buffer groove 122 is smaller than the width of the second buffer through hole 121.

[0057] In this embodiment, the width of the first buffer groove 112 decreases towards the end, and the width of the second buffer groove 122 also decreases towards the end. For example, the first buffer groove 112 can be a semi-circular groove, an oblong groove, or a triangular groove, etc. The second buffer groove 122 can be a semi-circular groove, an oblong groove, or a triangular groove, etc. This effectively controls the tearing direction of the insulating film.

[0058] The first buffer groove 112 has its starting end located at the edge of the first buffer through-hole 111, and its ending end inside the first insulating film 110. The direction from the starting end to the ending end of the first buffer groove 112 is a first direction, and the width of the first buffer groove 112 is its dimension in a second direction. The second buffer groove 122 has its starting end located at the edge of the second buffer through-hole 121, and its ending end inside the second insulating film 120. The direction from the starting end to the ending end of the second buffer groove 122 is also a first direction, and the width of the second buffer groove 122 is its dimension in the second direction. The first direction is perpendicular to the battery arrangement direction, and the second direction is perpendicular to the first direction. The first direction, being perpendicular to both the tear direction and the battery arrangement direction, provides good buffering effect and improves the service life of the battery device.

[0059] The first buffer groove 112 is an arc-shaped notch located at the edge of the first buffer through-hole 111, and / or the second buffer groove 122 is an arc-shaped notch located at the edge of the second buffer through-hole 121. For example, the first buffer groove 112 is semi-circular, and the second buffer groove 122 is semi-circular. The arc shape of the first buffer groove 112 and the second buffer groove 122 can improve the tear resistance of the first buffer groove 112 and the second buffer groove 122.

[0060] Or, such as Figure 6 As shown, the first buffer groove 112 has a linear structure, and the width at the end of the first buffer groove 112 is greater than 0. For example... Figure 11 As shown, the second buffer groove 122 has a linear structure, and the width of the end of the second buffer groove 122 is greater than 0.

[0061] The width of the end of the first buffer groove 112 is greater than 0, meaning that the end of the first buffer groove 112 is not a sharp corner, which can avoid stress concentration and thus improve the tear resistance of the first buffer groove 112. The width of the end of the second buffer groove 122 is greater than 0, meaning that the end of the second buffer groove 122 is not a sharp corner, which can avoid stress concentration and thus improve the tear resistance of the second buffer groove 122.

[0062] The end portion of the first buffer groove 112 has a first side 1121, a second side 1122, and an end edge 1123. In the first buffer groove 112, the first side 1121 is a line segment, the second side 1122 is a line segment, and the end edge 1123 is a line segment. One end of the end edge 1123 is connected to one end of the first side 1121 near the end of the first buffer groove 112, and the other end of the end edge 1123 is connected to one end of the second side 1122 near the end of the first buffer groove 112, so that the end edge 1123 forms the end of the first buffer groove 112. The end portion of the first buffer groove 112 is a segment of a predetermined length near the end of the first buffer groove 112.

[0063] And / or, the end portion of the second buffer groove 122 has a first side 1221, a second side 1222, and an end edge 1223. In the second buffer groove 122, the first side 1221 is a line segment, the second side 1222 is a line segment, and the end edge 1223 is a line segment. One end of the end edge 1223 is connected to one end of the first side 1221 near the end of the second buffer groove 122, and the other end of the end edge 1223 is connected to one end of the second side 1222 near the end of the second buffer groove 122, so that the end edge 1223 forms the end of the second buffer groove 122. The end portion of the second buffer groove 122 is a segment of a predetermined length near the end of the second buffer groove 122.

[0064] The end portion of the first buffer groove 112 refers to the section of the first buffer groove 112 near its end. The side of the first buffer groove 112 may include at least one line segment, that is, the side of the first buffer groove may be straight or broken. The end portion of the second buffer groove 122 refers to the section of the second buffer groove 122 near its end. The side of the second buffer groove 122 may include at least one line segment, that is, the side of the second buffer groove may be straight or broken.

[0065] For example, the first buffer groove 112 is a trapezoidal notch disposed at the edge of the first buffer through hole 111. The first buffer groove 112 has a first side 1121 (one waist of the trapezoid), a second side 1122 (the other waist of the trapezoid), and an end edge 1123 (the upper base of the trapezoid). The end edge 1123 is a line segment and forms the end of the first buffer groove 112. The first side 1121 and the second side 1122 are respectively connected to the two ends of the end edge 1123 and extend from the end edge 1123 to the first buffer through hole 111, and the distance between the first side 1121 and the second side 1122 decreases in the direction near the end.

[0066] The second buffer groove 122 is a trapezoidal notch located at the edge of the second buffer through hole 121. The second buffer groove 122 has a first side 1221 (one waist of the trapezoid), a second side 1222 (the other waist of the trapezoid), and an end edge 1223 (the upper base of the trapezoid). The end edge 1223 is a straight structure and forms the end of the second buffer groove 122. The first side 1221 and the second side 1222 are respectively connected to the two ends of the end edge 1223 and extend from the end edge to the second buffer through hole 121. The distance between the first side 1221 and the second side 1222 decreases in the direction near the end.

[0067] Or, such as Figure 5 As shown, the first buffer groove 112 has a linear structure, and the width at the end of the first buffer groove 112 is equal to 0. For example... Figure 10 As shown, the second buffer groove 122 has a linear structure, and the width of the end of the second buffer groove 122 is equal to 0. That is, the end of the first buffer groove 112 is a sharp corner, and the end of the second buffer groove 122 is a sharp corner.

[0068] By setting the end of the first buffer groove 112 and the end of the second buffer groove 122 to a sharp corner, the first buffer groove 112 and the second buffer groove 122 are easy to tear, and the tearing direction is determined by the direction of the sharp corner, which is beneficial to the control of the tearing direction.

[0069] The end portion of the first buffer groove 112 has a first side 1121 and a second side 1122. In the first buffer groove 112, the first side 1121 is a line segment, the second side 1122 is a line segment, and the end of the first side 1121 and the end of the second side 1122 are connected to form the end of the first buffer groove 112. The end portion of the first buffer groove 112 is a segment of a predetermined length near the end of the first buffer groove 112.

[0070] And / or, the end portion of the second buffer groove 122 has a first side 1221 and a second side 1222. In the second buffer groove 122, the first side 1221 is a line segment, the second side 1222 is a line segment, and the end of the first side 1221 and the end of the second side 1222 are connected to form the end of the second buffer groove 122. The end portion of the second buffer groove 122 is a segment of a predetermined length near the end of the second buffer groove 122.

[0071] The end portion of the first buffer groove 112 refers to the section of the first buffer groove 112 near its end. The side of the first buffer groove 112 may include at least one line segment, that is, the side of the first buffer groove 112 may be straight or broken. The end portion of the second buffer groove 122 refers to the section of the second buffer groove 122 near its end. The side of the second buffer groove 122 may include at least one line segment, that is, the side of the second buffer groove 122 may be straight or broken.

[0072] For example, the first buffer groove 112 has a first side 1121 and a second side 1122, the first side 1121 and the second side 1122 extending from the edge of the first buffer through hole 111 in a direction away from the first buffer through hole 111, the first side 1121 and the second side 1122 intersecting at the end of the first buffer groove 112, and the distance between the first side 1121 and the second side 1122 decreasing in the direction near the end.

[0073] The second buffer groove 122 has a first side 1221 and a second side 1222. The first side 1221 and the second side 1222 extend from the edge of the second buffer through hole 121 in a direction away from the second buffer through hole 121. The first side 1221 and the second side 1222 intersect at the end of the second buffer groove 122, and the distance between the first side 1221 and the second side 1222 decreases in the direction near the end.

[0074] Of course, in practical applications, the first buffer groove 112 and the second buffer groove 122 can also have other structures. For example, the first buffer groove 112 may include a first groove body and a first end, the first groove body and the first end being connected, and the first end being located on the side of the groove body near the end of the first buffer groove 112. The first groove body extends from the edge of the first buffer through hole 111 toward the end, the width of the first groove body remains unchanged, and the width of the first end decreases along the direction near the end of the first buffer groove 112. For example, the first groove body can be a rectangular structure, and the first end can be a rounded arc or a sharp corner, etc. The second buffer groove 122 may include a second groove body and a second end, the second groove body and the second end being connected, and the second end being located on the side of the groove body near the end of the second buffer groove 122. The second groove body extends from the edge of the second buffer through hole 121 toward the end of the second buffer groove 122, the width of the second groove body remains unchanged, and the width of the second end decreases along the direction near the end. For example, the second groove body can be a rectangular structure, and the second end can be a rounded arc or a sharp corner, etc.

[0075] In this embodiment, the insulating film assembly may have a buffer zone. A first buffer through-hole 111 may be disposed at a position corresponding to the buffer zone on the first insulating film 110, and a second buffer through-hole 121 may be disposed at a position corresponding to the buffer zone on the second insulating film 120. Multiple buffer zones may be provided on the insulating film assembly, and at least one first buffer through-hole 111 and at least one second buffer through-hole 121 may be provided in one buffer zone.

[0076] For example, such as Figure 13 , Figure 14 , Figure 15 and Figure 16As shown, the buffer zone can be provided with two second buffer through holes 121 and one first buffer through hole 111. A partition area 125 is provided in the second insulating film 120, and the second buffer through holes 121 are respectively provided on both sides of the partition area 125. The orthographic projection of the first buffer through hole 111 on the second insulating film 120 is located in the partition area 125.

[0077] When second buffer through holes 121 are respectively provided on both sides of the partition area 125, second buffer grooves 122 are respectively provided on both sides of the partition area 125, and each second buffer groove 122 is connected to the corresponding second buffer through hole 121. The first buffer through hole 111 is provided in the orthographic projection area of ​​the partition area 125 on the first insulating film 110, and the second buffer grooves 122 are respectively provided on both sides of the first buffer through hole 111. For example, the ends of the second buffer grooves 122 on both sides of the partition area 125 are arranged opposite to each other, and the second buffer grooves 122 can be provided in the middle position of the partition area 125. At this time, the partition area 125 forms a "dumbbell" shaped structure, which has low strength and is easily torn.

[0078] A conductive layer 200 is disposed between the first insulating film 110 and the second insulating film 120. The conductive layer 200 includes a circuit board 220 and a busbar 210. A second buffer via 121 is located at the end of the second orthographic projection area 123 away from the circuit board 220, and / or the second buffer via 121 is located at the end of the second orthographic projection area 123 close to the circuit board 220. That is, the first buffer via 111 and the second buffer via 121 are arranged along a direction perpendicular to the length of the circuit board 220.

[0079] Specifically, the orthographic projection of the first buffer via 111 onto the surface of the conductive layer 200 may or may not coincide with the circuit board 220 and bus 210. Similarly, the orthographic projection of the second buffer via 121 onto the surface of the conductive layer 200 may or may not coincide with the circuit board 220 and bus 210. The orthographic projection of the first buffer groove 112 onto the surface of the conductive layer 200 may or may not coincide with the circuit board 220 and bus 210. The orthographic projection of the second buffer groove 122 onto the surface of the conductive layer 200 may or may not coincide with the circuit board 220 and bus 210.

[0080] The conductive layer 200 may include at least one row of buses 210, and each row of buses 210 may include multiple buses 210 arranged along the length of the circuit board 220. For example, the conductive layer 200 may include two rows of buses 210, which are respectively disposed on both sides of the circuit board 220. The first buffer via 111 and the second buffer via 121 may be disposed between two adjacent buses 210 in a row of buses 210.

[0081] The first buffer through-hole 111 and the first orthographic projection area 113 are arranged along a first direction, which is perpendicular to the second direction, which is the battery arrangement direction. That is, the second buffer through-hole 121 and the first buffer through-hole 111 are arranged along the first direction, and their arrangement direction is perpendicular to the battery arrangement direction. A busbar 210 is arranged along the second direction.

[0082] For example, such as Figure 17 As shown, there is a third gap between the first busbar 211 and the second busbar 212. The first buffer through-hole 111 is located in the orthographic projection area of ​​the third gap on the first insulating film 110, and the second buffer through-hole 121 is located in the orthographic projection area of ​​the third gap on the second insulating film 120. The first busbar 211 and the second busbar 212 are any two adjacent buses 210 in a row of buses 210.

[0083] In this embodiment, a busbar 210 includes multiple busbars 210, that is, the insulating film assembly has multiple third spacing regions. In this embodiment, a first buffer through-hole 111 and a second buffer through-hole 121 may be provided in each third spacing region, or the first buffer through-hole 111 and the second buffer through-hole 121 may be provided in one or some of the multiple third spacing regions. This embodiment does not specifically limit the specific implementation of the method.

[0084] Between the first busbar 211 and the second busbar 212, the first buffer groove 112 and the second buffer groove 122 form a third buffer through hole 11 penetrating the insulating film assembly. At least one third buffer through hole 11 in the insulating film assembly is located between the welding area of ​​the first busbar 211 and the welding area of ​​the second busbar 212.

[0085] In the battery device, the busbar 210 and the corresponding terminal are welded. The connection strength between the insulating film assembly and the battery is the greatest in the welding area of ​​the busbar 210. Furthermore, stress concentration is easily generated when the busbar 210 and the terminal are welded. During battery use, the stress is relatively concentrated in this area when the battery bulges. Placing the third buffer through hole 11 between the welding area of ​​the first busbar 211 and the welding area of ​​the second busbar 212 is beneficial for stress release.

[0086] A third buffer through-hole 11 is provided between the first busbar 211 and the second busbar 212. The distance between the third buffer through-hole 11 and the first busbar 211 is the same as the distance between the third buffer through-hole 11 and the second busbar 212. A first positioning hole 21 is provided on the first busbar 211, and a second positioning hole 22 is provided on the second busbar 212. The first positioning hole 21, the third buffer through-hole 11, and the second positioning hole 22 are located in a straight line.

[0087] By setting the first positioning hole 21, the second positioning hole 22 and the third buffer through hole 11 to be in a straight line, it is convenient for processing and positioning, provides a better buffering effect, and can prevent foreign objects from entering.

[0088] The first positioning hole 21, the second positioning hole 22, and the third buffer through hole 11 can all be circular holes. In this case, the first positioning hole 21, the third buffer through hole 11, and the second positioning hole 22 being located on a straight line means that the centers of the first positioning hole 21, the second positioning hole 22, and the third buffer through hole 11 are collinear. Of course, in practical applications, the first positioning hole 21, the second positioning hole 22, and the third buffer through hole 11 can also be holes of other shapes, such as rhomboid holes or elliptical holes. This embodiment of the present disclosure is not limited to these.

[0089] like Figure 7 As shown, a first anti-crack hole 116 is provided on the first insulating film 110. The first anti-crack hole 116 is located on one side of the end of the first buffer groove 112 and is spaced apart from the first buffer groove 112; Figure 12 As shown, a second anti-crack hole 126 is provided on the second insulating film 120. The second anti-crack hole 126 is located on one side of the end of the second buffer groove 122 and is spaced apart from the second buffer groove 122.

[0090] In this embodiment of the disclosure, the first anti-crack hole 116 and the second anti-crack hole 126 are used to prevent cracking, and the first anti-crack hole 116 and the second anti-crack hole 126 can also be used to connect the module cover plate. The module cover plate can be provided with a connecting protrusion for connecting with the first anti-crack hole 116 and the second anti-crack hole 126.

[0091] Since the busbar 210 is welded to the battery terminal at the positioning hole, the connection strength between the two busbar 210 positioning holes and the surrounding area and the battery is high. Placing the anti-crack hole between the two positioning holes is beneficial to the connection strength between the module cover and the insulating film assembly.

[0092] In this embodiment, the circuit board 220 can be an FPC (Flexible Printed Circuit), FFC (Flexible Flat Cable), or PCB (Printed Circuit Board), etc. The busbar 210 can be a copper busbar or an aluminum busbar, etc. The circuit board 220 is connected to the busbar 210. The circuit board 220 is used to collect low-voltage signals from the busbar 210, such as temperature signals, humidity signals, and other control signals. Alternatively, the circuit board 220 can also be used to transmit high-voltage signals (signals output from the battery). The circuit board 220 can be connected to a low-voltage support to output low-voltage signals. The busbar 210 can be connected to a high-voltage support to input or output high-voltage signals. The high-voltage support and the low-voltage support can be located on an end plate.

[0093] It should be noted that, in the embodiments of this disclosure, the terms "orthographic projection" and "orthographic projection area" refer to orthographic projection or orthographic projection area.

[0094] The insulating film assembly provided in this embodiment has a first buffer through-hole 111 in the first insulating film 110 and a second buffer through-hole 121 on the second insulating film 120. The orthographic projection of the second buffer through-hole 121 on the first insulating film 110 and the first buffer through-hole 111 do not overlap, so that a single-layer film area is formed on the insulating film assembly. The single-layer film has high flexibility and is easy to tear, with good buffering effect, thereby improving the safety of the battery device. Furthermore, the first buffer groove 112 and the second buffer groove 122 provided between the first buffer through-hole 111 and the second buffer through-hole 121 can guide the tearing direction, making it easier to control the tearing direction of the insulating film assembly, and can reduce the area of ​​the holes on the insulating film assembly, preventing foreign objects from entering the battery device or the insulating film assembly.

[0095] An exemplary embodiment of this disclosure also provides a battery device including the insulating film assembly 10 described above.

[0096] In one feasible implementation, the battery device may be a battery module 01, such as Figure 18 As shown, the battery module 01 may include a battery pack and an insulating film assembly 10, with the insulating film assembly 10 disposed on the top surface of the battery pack. The battery pack includes multiple batteries 410 arranged sequentially. The insulating film assembly 10 includes an insulating film layer 100 and a conductive layer 200, which are connected. The conductive layer 200 includes a busbar 210 and a circuit board 220. The busbar 220 is used to connect to the terminals 404 on the batteries. The circuit board 210 is used to connect to a low-voltage support and for transmitting control signals, etc. The insulating film covers the busbar 220 and the circuit board 210.

[0097] The battery pack includes multiple batteries 410 arranged sequentially. End plates are provided at both ends of the battery arrangement direction, and the end plates are used to limit the movement of the multiple batteries.

[0098] In this embodiment of the disclosure, the battery module 01 may further include an end plate and a side plate, and multiple batteries form a battery pack, with end plates provided at both ends of the battery pack. For example, the battery module may include a first end plate 510 and a second end plate 520, which are respectively disposed at both ends of the battery pack, and the first end plate 510 and the second end plate 520 are used to fix the battery pack.

[0099] The battery pack has a first side plate and a second side plate (not shown in the figure) on both sides. The first side plate is located on one side of the battery pack, and its two ends are connected to the first end plate 510 and the second end plate 520, respectively. The second side plate is located on the other side of the battery pack, and its two ends are connected to the first end plate 510 and the second end plate 520, respectively. That is, the first end plate 510, the first side plate, the second end plate 520, and the second side plate are connected end to end to form a battery housing compartment, in which the battery pack is housed.

[0100] like Figure 19 As shown, the battery 410 may include a housing 401, a cell body 402, tabs 403, and terminals 404. The housing 401 has a cavity, and the cell body 402 is disposed in the cavity of the housing 401. The housing 401 may be formed by stamping or welding, etc. The cavity in the housing 401 may be a sealed cavity, and the cell body 402 is disposed in the sealed cavity. The tabs 403 are connected to the cell body 402, and the tabs 403 extend from the top of the cell body 402. The tabs 403 are used to connect to the terminals 404, and the terminals 404 are disposed on the top surface of the housing 401.

[0101] For example, housing 401 can be a thin-walled structure that is cuboid or approximately cuboid. Housing 401 may include a first housing and a second housing, the first housing being a flat plate structure. The second housing is a cuboid cavity with an opening on one side, and the first housing is connected to the opening of the second housing. The first housing and the second housing can be connected by welding.

[0102] The opening of the second housing can be located on the top surface of the second housing. The first housing is connected to the second housing, and the top surface of the battery is ultimately formed by the first housing. A terminal post 404 can be provided on the first housing, and the terminal post 404 is connected to the tab 403.

[0103] Optionally, the housing 401 can be made of stainless steel or aluminum, which has good corrosion resistance and sufficient strength. The first and second housings can be made of the same material, or they can be made of different materials; this disclosure does not specifically limit this.

[0104] The pole piece 404 can be connected to the first housing by means of bolts or welding. For example, two through holes can be provided on the first housing, with the two through holes respectively located near the ends of the first housing.

[0105] The cell body 402 can be a stacked cell body or a wound cell body. When the cell body 402 is a stacked cell body, the cell body 402 has a first electrode sheet stacked on top of each other, a second electrode sheet with the opposite electrical polarity to the first electrode sheet, and a separator sheet disposed between the first electrode sheet and the second electrode sheet, so that multiple pairs of first electrode sheets and second electrode sheets are stacked to form a stacked cell.

[0106] In another feasible implementation, such as Figure 20 As shown, the battery device can be a battery pack, which includes the aforementioned insulating film assembly 10.

[0107] Furthermore, the battery pack provided in this embodiment may also include a housing 60, which may include a frame and internal beams. The frame is a closed frame, and the internal beams are located inside the frame, dividing the space into multiple battery compartments. The internal beams may be connected to the frame, for example, by welding, plugging, or bolting.

[0108] The battery pack may include the aforementioned battery module 01, which is a battery module consisting of 10 components including a battery pack, an end plate, and an insulating film assembly, and the battery module is located inside the battery compartment.

[0109] Alternatively, the battery pack can be directly installed in the battery compartment, with the insulating film assembly 10 located within the battery pack. Here, "battery pack directly placed in the battery compartment" means that no end plate is installed at the end of the battery pack, and the battery pack is directly connected to or abuts against the frame or internal beam.

[0110] The enclosure can be a rectangular frame, and it may include a first side beam 601, a second side beam 602, a third side beam 603, and a fourth side beam 604, which are connected end to end in sequence. The first side beam 601 and the third side beam 603 are arranged in parallel, and the second side beam 602 and the fourth side beam 604 are arranged in parallel.

[0111] The internal beams may include crossbeams 605 and longitudinal beams 606. The internal beams are located inside the enclosure and are connected to the enclosure. The connection between the internal beams and the enclosure may be one or more of the following: welding, plug-in, adhesive bonding, bolting, and connector bonding.

[0112] For example, the crossbeam 605 and the first side beam 601 are arranged in parallel, and the two ends of the crossbeam 605 are connected to the second side beam 602 and the fourth side beam 604, respectively. At least one crossbeam 605 can be provided in the enclosure. When there is one crossbeam 605 in the enclosure, the crossbeam 605 can be located in the middle position between the first side beam 601 and the third side beam 603. When there are multiple crossbeams 605 in the enclosure, the multiple crossbeams 605 can be evenly distributed between the first side beam 601 and the third side beam 603.

[0113] The connection method between the crossbeam 605 and the second side beam 602 can be one or more of welding, plug-in, adhesive bonding, bolting, and connector connection. The connection method between the crossbeam 605 and the fourth side beam 604 can be one or more of welding, plug-in, adhesive bonding, bolting, and connector connection.

[0114] The longitudinal beam 606 and the second side beam 602 are arranged in parallel, and the two ends of the transverse beam 605 are respectively connected to the first side beam 601 and the third side beam 603. At least one longitudinal beam 606 can be provided in the enclosure. When there is one longitudinal beam 606 in the enclosure, it can be located in the middle position between the second side beam 602 and the fourth side beam 604. When there are multiple longitudinal beams 606 in the enclosure, they can be evenly distributed between the second side beam 602 and the fourth side beam 604.

[0115] The connection method between the longitudinal beam 606 and the first side beam 601 can be one or more of welding, plug-in, adhesive bonding, bolting, and connector connection. The connection method between the longitudinal beam 606 and the third side beam 603 can be one or more of welding, plug-in, adhesive bonding, bolting, and connector connection.

[0116] In one embodiment, both the frame and the internal beam can be hollow extruded profiles, such as hollow aluminum alloy square tubes or hollow stainless steel square tubes for the internal beams. In practical applications, to increase the strength of the internal beams, reinforcing members can also be provided in the internal cavities of the internal beams. For example, reinforcing ribs can be provided in the cavities of the internal beams, with the reinforcing ribs arranged along the length of the internal beams.

[0117] Furthermore, the housing 60 provided in this embodiment may also include a bottom plate for supporting the battery pack. The frame and the bottom plate are connected, forming an accommodating space, and an internal beam is disposed within the accommodating space formed by the frame and the bottom plate.

[0118] The base plate can be a rectangular plate, and the first side beam 601, the second side beam 602, the third side beam 603, and the fourth side beam 604 can be connected to one side of the base plate respectively. The first side beam 601, the second side beam 602, the third side beam 603, and the fourth side beam 604 can be provided on the upper surface of the base plate, or the first side beam 601, the second side beam 602, the third side beam 603, and the fourth side beam 604 can surround the base plate.

[0119] The upper surface of the base plate is used to support the battery pack, therefore it is a flat surface. The battery pack contacts the upper surface of the base plate; the flat surface increases the contact area between the base plate and the battery, preventing stress concentration on the base plate and thus avoiding localized failure. In practical applications, the base plate can also bear only part of the battery's weight. The battery can be connected to the frame and internal beams using adhesive bonding or other methods, with the frame and internal beams bearing part of the weight.

[0120] In this embodiment, the base plate, the frame, and the internal beams form multiple battery compartments, and the battery packs are located in the battery compartments. Each battery compartment may be equipped with one or more battery packs.

[0121] The battery device provided in this disclosure can be used in electric vehicles and can be mounted on the vehicle frame. The battery device can be fixedly connected to the frame. Alternatively, the battery device can be a modular battery pack, which can be detachably connected to the vehicle body for easy replacement.

[0122] The insulating film assembly provided in this embodiment has a first buffer through-hole 111 in the first insulating film 110 and a second buffer through-hole 121 on the second insulating film 120. The orthographic projection of the second buffer through-hole 121 on the first insulating film 110 and the first buffer through-hole 111 do not overlap, so that a single-layer film area is formed on the insulating film assembly. The single-layer film has high flexibility and is easy to tear, with good buffering effect, thereby improving the safety of the battery device. Furthermore, the first buffer groove 112 and the second buffer groove 122 provided between the first buffer through-hole 111 and the second buffer through-hole 121 can guide the tearing direction, making it easier to control the tearing direction of the insulating film assembly, and can reduce the area of ​​the holes on the insulating film assembly, preventing foreign objects from entering the battery device or the insulating film assembly.

[0123] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An insulating film assembly, characterized in that, The insulating film assembly includes: A first insulating film, wherein a first buffer through-hole is provided in the first insulating film; A second insulating film is disposed opposite to the first insulating film. A second buffer through-hole is provided in the second insulating film. The orthographic projection of the second buffer through-hole on the first insulating film and the first buffer through-hole do not overlap. A single-layer film structure is formed in the first orthographic projection area on the first insulating film and in the second orthographic projection area on the second insulating film. The first orthographic projection area is the orthographic projection area of ​​the second buffer through-hole in the first insulating film, and the second orthographic projection area is the orthographic projection area of ​​the first buffer through-hole in the second insulating film. A conductive layer is disposed between the first insulating film and the second insulating film, and the conductive layer includes a busbar; The first insulating film is further provided with a first buffer groove, which is located on the side of the first buffer through hole near the first orthographic projection area and is connected to the first buffer through hole. The second insulating film is further provided with a second buffer groove, which is located on the side of the second buffer through hole near the second orthographic projection area and is connected to the second buffer through hole. The orthographic projection area of ​​the second buffer groove on the first insulating film at least partially coincides with the first buffer groove. The orthographic projections of the first buffer groove and the second buffer groove on the conductive layer at least partially do not coincide with the conductive layer. The orthographic projections of the first buffer through hole and the second buffer through hole on the conductive layer at least partially do not coincide with the conductive layer.

2. The insulating film assembly as described in claim 1, characterized in that, The first insulating film has a first gap region, which is located between the first buffer through hole and the first orthographic projection region, and the first buffer groove is at least partially located in the first gap region; The second insulating film has a second spacing region located between the second buffer through-hole and the second orthographic projection region, and the second buffer groove is at least partially located in the second spacing region.

3. The insulating film assembly as described in claim 1 or 2, characterized in that, The end of the first buffer groove is projected onto the second insulating film and located in the second buffer groove or the second buffer through hole. The end of the first buffer groove is the end of the first buffer groove that is away from the first buffer through hole. The end of the second buffer groove is projected onto the first insulating film at either the first buffer groove or the first buffer through hole, and the end of the second buffer groove is the end of the second buffer groove away from the second buffer through hole.

4. The insulating film assembly as described in claim 3, characterized in that, The width of the first buffer groove decreases towards the end of the first buffer groove, and the width of the second buffer groove decreases towards the end of the second buffer groove.

5. The insulating film assembly as described in claim 4, characterized in that, The decreasing direction of the width of the first buffer groove is perpendicular to the direction of the battery arrangement, and the decreasing direction of the width of the second buffer groove is perpendicular to the direction of the battery arrangement.

6. The insulating film assembly as claimed in claim 4, characterized in that, The first buffer groove is an arc-shaped notch located at the edge of the first buffer through hole, and / or the second buffer groove is an arc-shaped notch located at the edge of the second buffer through hole.

7. The insulating film assembly as claimed in claim 4, characterized in that, The end portion of the first buffer groove has a first side, a second side, and an end edge. In the first buffer groove, the first side is a line segment, the second side is a line segment, and the end edge is a line segment. One end of the end edge is connected to the end of the first side near the end of the first buffer groove, and the other end of the end edge is connected to the end of the second side near the end of the first buffer groove, so that the end edge forms the end of the first buffer groove. The end portion of the first buffer groove is a segment of a predetermined length near the end of the first buffer groove. And / or, the end portion of the second buffer groove has a first side, a second side, and an end edge. In the second buffer groove, the first side is a line segment, the second side is a line segment, and the end edge is a line segment. One end of the end edge is connected to the end of the first side near the end of the second buffer groove, and the other end of the end edge is connected to the end of the second side near the end of the second buffer groove, so that the end edge forms the end of the second buffer groove. The end portion of the second buffer groove is a segment of a predetermined length near the end of the second buffer groove.

8. The insulating film assembly as claimed in claim 4, characterized in that, The end of the first buffer groove has a first side and a second side. In the first buffer groove, the first side is a line segment and the second side is a line segment. The end of the first side and the end of the second side are connected to form the end of the first buffer groove. The end of the first buffer groove is a segment of a predetermined length near the end of the first buffer groove. And / or, the end portion of the second buffer groove has a first side and a second side, wherein the first side is a line segment and the second side is a line segment, and the end of the first side and the end of the second side are connected to form the end of the second buffer groove, and the end portion of the second buffer groove is a segment of a predetermined length near the end of the second buffer groove.

9. The insulating film assembly as claimed in claim 1, characterized in that, The first insulating film is provided with a first anti-crack hole, which is located on one side of the end of the first buffer groove and is spaced apart from the first buffer groove. The second insulating film is provided with a second anti-crack hole, which is located on one side of the end of the second buffer groove and is spaced apart from the second buffer groove.

10. The insulating film assembly as claimed in claim 1, characterized in that, A partition area is provided in the second insulating film, and a second buffer through hole is provided on both sides of the partition area. The orthogonal projection of the first buffer through hole on the second insulating film is located in the partition area.

11. The insulating film assembly as claimed in claim 10, characterized in that, A second buffer groove is provided on each side of the partition area.

12. The insulating film assembly as claimed in claim 11, characterized in that, The ends of the second buffer grooves on both sides of the dividing area are arranged opposite each other.

13. The insulating film assembly as claimed in claim 1, characterized in that, The conductive layer further includes: The circuit board, wherein the second buffer via is located at one end of the second orthographic projection area away from the circuit board, and / or the second buffer via is located at one end of the second orthographic projection area close to the circuit board.

14. The insulating film assembly as claimed in claim 13, characterized in that, The conductive layer includes: At least one bus, said bus comprising a plurality of buses arranged along the battery arrangement direction; There is a third gap between the first bus and the second bus. The first buffer through-hole is located in the orthographic projection area of ​​the third gap on the first insulating film, and the second buffer through-hole is located in the orthographic projection area of ​​the third gap on the second insulating film. The first bus and the second bus are any two adjacent buses in the row of buses.

15. The insulating film assembly as claimed in claim 14, characterized in that, Between the first busbar and the second busbar, the first buffer groove and the second buffer groove form a third buffer through-hole penetrating the insulating film assembly, and at least one of the third buffer through-holes in the insulating film assembly is located between the welding area of ​​the first busbar and the welding area of ​​the second busbar.

16. The insulating film assembly as claimed in claim 15, characterized in that, A third buffer through-hole is provided between the first busbar and the second busbar, and the distance between the third buffer through-hole and the first busbar is the same as the distance between the third buffer through-hole and the second busbar.

17. The insulating film assembly as claimed in claim 16, characterized in that, The first busbar is provided with a first positioning hole, and the second busbar is provided with a second positioning hole. The first positioning hole, the third buffer through hole, and the second positioning hole are located in a straight line.

18. The insulating film assembly according to any one of claims 1-17, characterized in that, The first buffer through-hole and the first orthographic projection area are arranged along the first direction, which is perpendicular to the second direction, and the second direction is the battery arrangement direction.

19. A battery device, characterized in that, The battery device includes the insulating film assembly as described in any one of claims 1-18.

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