CN218602706U

CN218602706U - Insulating film and battery module

Info

Publication number: CN218602706U
Application number: CN202220867615.4U
Authority: CN
Inventors: 秦计生; 肖谋远; 杨伟; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2023-03-10
Anticipated expiration: 2032-04-14

Abstract

The application discloses an insulating film and a battery module, wherein the insulating film is used for coating a single battery and comprises a base material and an adhesive layer, and the adhesive layer is positioned on one side of the base material; along the length direction of the single battery, at least one end of the insulating film is provided with a first area, a second area and a third area, and the areas are sequentially arranged along the width direction of the single battery so as to form a gap in a surrounding manner; the first region and the second region are both bendable so that the adhesive layer of the first region is bonded to the adhesive layer of the third region, and part of the adhesive layer of the second region is bonded to the base material of the first region so as to form a laminated structure that can be bonded to the narrow side surface of the cell, and the other part of the adhesive layer of the second region can be exposed. This embodiment can expose the risk position of intaking easily in the outside through set up the breach on the insulating film to be convenient for seal the position of intaking from the outside, help promoting sealing ability, reduce the infiltration risk.

Description

Insulating film and battery module

Technical Field

The application relates to the technical field of energy storage devices, in particular to an insulating film and a battery module.

Background

Generally, it is difficult to realize complete sealing for a battery module, if external water vapor enters the inside of the module, and condensed water is formed on the surface of a battery, or external liquid water directly enters the module and contacts the battery, which may cause the discharge phenomenon on the surface of the battery, and affect the safety of the battery, therefore, the battery module is provided with an insulating film to realize the insulation protection of the battery, the insulating film usually adopts a rectangular blue film, the blue film is bent and then wrapped on the outer side of the battery, wherein the blue film forms a multilayer laminated structure at the narrow side of the battery, gaps are formed between the laminated structures, and the risk of water seepage still exists.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides an insulating film which can improve the sealing capability and reduce the water seepage risk.

The application also discloses a battery module applying the insulating film.

According to the insulating film in the first embodiment of the present application, the insulating film is used for covering the single battery, and comprises a base material and an adhesive layer, wherein the adhesive layer is positioned on one side of the base material;

at least one end of the insulating film is provided with a first area, a second area and a third area along the length direction of the single battery, the first area, the third area and the second area are sequentially arranged along the width direction of the single battery, and the first area, the third area and the second area surround to form a gap;

wherein the first region and the second region are both bendable so that the adhesive layer of the first region is adhered to the adhesive layer of the third region, a part of the adhesive layer of the second region is adhered to the base material of the first region to form a laminated structure that can be attached to a narrow side surface of the unit cell, and another part of the adhesive layer of the second region can be exposed.

According to the battery module of this application embodiment, have following beneficial effect at least:

this embodiment can expose the risk position of intaking easily in the outside through set up the breach on the insulating film to be convenient for seal the position of intaking from the outside, help promoting sealing ability, reduce the infiltration risk.

In other embodiments of this application, the first region with can relatively buckle in order to form first crease between the third region, the second region with can relatively buckle in order to form the second crease between the third region, the border of breach includes first straightway and second straightway, first straightway with the second straightway intersects in the first point, first crease with first straightway is crossing, the second crease with the second straightway is crossing.

In other embodiments of the present application, the first fold intersects the second fold at the first point.

In other embodiments of this application, the first region with can relatively buckle in order to form first crease between the third region, the second region with can relatively buckle in order to form the second crease between the third region, first crease with the second crease is in intersect in same point on the border of breach.

In other embodiments of the present application, the edge of the notch is an arc segment; or the notch is a triangular notch.

In another embodiment of the present application, the insulating film further includes a fourth region and a fifth region, the fourth region being provided adjacent to the first region, the fifth region being provided adjacent to the second region, the fourth region being bendable to bond the adhesive layer of the fourth region to the narrow side of the unit cell and form a third fold between the fourth region and the first region, the fifth region being bendable to bond the adhesive layer of the fifth region to the base material of the fourth region and form a fourth fold between the fifth region and the second region, and the stacked structure being bendable to bond the base material of the second region to the base material of the fifth region;

wherein the insulating film has an outer side edge disposed along the width direction, the third fold line intersects the outer side edge at a fourth point, the fourth fold line intersects the outer side edge at a fifth point, and the notch is located between the fourth point and the fifth point.

According to the battery module in the second embodiment of the present application, including:

the single battery comprises a wide side face and a narrow side face, wherein the wide side face and the narrow side face are adjacently arranged and are mutually vertical;

the insulating film described above, wherein the adhesive layer of the fourth region is bonded to the narrow side surface, the adhesive layer of the fifth region is bonded to the base material of the fourth region, the adhesive layer of the first region is bonded to the adhesive layer of the third region, a part of the adhesive layer of the second region is bonded to the base material of the first region, and another part of the adhesive layer is exposed in a direction away from the narrow side surface, and the base material of the second region is bonded to the base material of the fifth region;

and a sealing member bonded to the exposed region of the second region, extending at least to the base material of the first region, and bonded to the base material of the first region.

In other embodiments of the present application, the sealing member is bonded to a portion of the substrate of the fourth region, and/or the sealing member is bonded to a portion of the substrate of the fifth region.

In other embodiments of the present application, the sealing member is rectangular, and along the width direction of the single battery, the sealing member extends to at least the wide side surfaces on both sides, and along the height direction of the single battery, the upper edge of the sealing member is higher than the highest position of the exposed area, and the lower edge of the sealing member is lower than the lowest position of the exposed area.

In other embodiments of the present application, the sealing member includes an adhesive tape or a UV adhesive layer formed by curing. Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

FIG. 1 is a schematic diagram of an embodiment of an insulating film according to the present application;

FIG. 2 is an enlarged view of region I in FIG. 1;

FIG. 3 is an enlarged view of an insulating film in another embodiment of the present application;

FIG. 4 is an enlarged view of an insulating film in another embodiment of the present application;

FIG. 5 is an enlarged view of an insulating film in another embodiment of the present application;

FIG. 6 is a schematic perspective view of a single battery cell covered with the insulating film of FIG. 1;

FIG. 7 is a schematic perspective view of a single battery cell covered with the insulating film of FIG. 1;

fig. 8 is a schematic perspective view of a unit cell covered with the insulating film of fig. 1;

fig. 9 is a schematic perspective view of a unit cell covered with the insulating film of fig. 1;

FIG. 10 is an enlarged view of area II of FIG. 9;

FIG. 11 is a schematic perspective view of the insulating film of FIG. 10 closed in the water inlet position by a sealing member;

FIG. 12 is a schematic perspective view of the insulating film of FIG. 10 in a position where it is sealed from water by another sealing member;

fig. 13 is a schematic perspective view of a unit cell covered with the insulating film of fig. 4.

Reference numerals are as follows:

the insulating film 100, the first fold 110, the second fold 120, the third fold 130, the fourth fold 140, the second point 141, the third point 142, the first bend 143, the second bend 144, the third bend 145, the fifth fold 150, the sixth fold 160, the seventh fold 170, the first outer side 180, the main body 181, the concave section 182, the first straight line 1821, the second straight line 1822, the first point 1823, the fourth point 183, the fifth point 184, the second outer side 190, the first region a, the second region B, the third region C, the fourth region D, the fifth region E, the sixth region F, the seventh region G, the eighth region H, the exposed region J, the first bend K, and the second bend L;

cell 200, narrow side 210;

a seal 300.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1 and 2, fig. 1 is a schematic view of an insulation film in an unfolded state according to an embodiment of the present invention, and fig. 2 is an enlarged schematic view of a region i in fig. 1.

The insulating film has an adhesive function, and specifically includes a substrate and an adhesive layer on one side of the substrate, that is, only one side of the insulating film has adhesiveness. When the insulating film is in an unfolded state, referring to fig. 1, along the length direction of the single battery, that is, the left-right direction in the drawing, at least one end of the insulating film is provided with a first region a, a second region B, and a third region C, along the width direction of the single battery, that is, the up-down direction in the drawing, the first region a, the third region C, and the second region B are sequentially arranged, and the first region a, the third region C, and the second region B surround to form a gap. When the insulating film covers the single battery, the first region a, the second region B, and the third region C may form a laminated structure, and may be bonded to the narrow side of the single battery to achieve waterproof sealing (note that the bonding here may be understood as the lamination structure indirectly bonded to the single battery through other portions of the insulating film), specifically, both the first region a and the second region B may be bent with respect to the third region C, where the first region a is bent first to bond the adhesive layer of the first region a to the adhesive layer of the third region C, and the second region B is bent later to bond part of the adhesive layer of the second region B to the base material of the first region a, and another part of the adhesive layer of the second region may be exposed.

The division of the insulating film into regions in the embodiment is specifically described below with reference to the drawings, as shown in fig. 1, the insulating film is approximately rectangular in the unfolded state, and specifically includes two first outer sides 180 and two second outer sides 190, the two first outer sides 180 are disposed opposite to each other in the up-down direction, the two second outer sides 190 are disposed opposite to each other in the left-right direction, and the first outer sides 180 are perpendicular to the second outer sides 190. The insulating film may be bent to form a case structure covering the single battery, and the insulating film may be bent to form a fold, where the fold is indicated by a dotted line in the drawing, and the fold may be a line that is visible on the insulating film as a real object or a virtual line.

Further, the insulating film is substantially symmetrical up and down along a central axis parallel to the left-right direction and passing through the center of the insulating film, so this embodiment is mainly exemplified by the upper half of the insulating film, and the lower half is understood with reference.

As shown in fig. 1, the upper half portion of the insulating film 100 includes a fourth fold 140, a fifth fold 150 and a sixth fold 160, the fourth fold 140 is adjacent to the first outer side 180 of the upper side and perpendicular to the first outer side 180, and two ends of the fourth fold 140 extend to the second outer sides 190 of the left and right sides respectively. The two fifth creases 150 are both parallel to the second outer side edge 190 and both located between the two fourth creases 140. Referring to fig. 2, the upper end of the fifth fold 150 extends to the fourth fold 140, thereby forming a second point 141. Similarly, the upper end of the sixth fold 160 also extends to the fourth fold 140 to form a third point 142, so that the fourth fold 140 is further divided into a first bending section 143, a second bending section 144 and a third bending section 145, which are sequentially arranged, by the second point 141 and the third point 142.

With continued reference to fig. 2, a notch is formed on the first outer side edge 180, specifically, the first outer side edge 180 includes a main body section 181 and a concave section 182, the concave section 182 surrounds the notch, the concave section 182 has main body sections 181 on both left and right sides, the main body sections 181 are straight lines, wherein the notch can be formed on the complete rectangular insulating film by removing material, so as to form the concave section 182 on the first outer side edge 180.

The insulating film further comprises a first fold 110, a second fold 120, a third fold 130 and a seventh fold 170, the first fold 110 is formed by bending the first region a relative to the third region C, the second fold 120 is formed by bending the second region B relative to the third region C, the first fold 110, the second fold 120, the third fold 130 and the seventh fold 170 are all located between the fourth fold 140 and the first outer side 180, in particular, the lower end of the third fold 130 extends to the second point 141, the upper end extends to the body section 181, in particular, the body section 181 on the left side of the recessed section 182, so as to intersect the body section 181 at a fourth point 183, the lower end of the seventh fold 170 extends to the third point 142, the upper end extends to the body section 181, in particular, the body section 181 on the right side of the recessed section 182, so as to intersect the body section 181 at a fifth point 184, the recessed section 182 is located between the third fold 130 and the seventh fold 170, in other words, the notch is located between the third fold 130 and the seventh fold 170. It should be noted that the third fold 130 and the fifth fold 150 may be collinear, the seventh fold 170 and the sixth fold 160 may be collinear, for example, as shown in fig. 2, the third fold 130 and the fifth fold 150 may not be collinear, and the seventh fold 170 and the sixth fold 160 may not be collinear, for example, as shown in fig. 3.

With continued reference to fig. 2, the lower end of the first fold 110 extends to the second point 141 and the other end extends to the recessed section 182, the lower end of the second fold 120 extends to the third point 142, and the upper end also extends to the recessed section 182. Thus, the third fold 130, the first fold 110 and the first outer side 180 define a first area a, the seventh fold 170, the second fold 120 and the first outer side 180 define a second area B, the first fold 110, the second fold 120 and the fourth fold 140 (specifically, the second bending section 144) define a third area C, and the first area a and the second area B are respectively located at two sides of the third area C.

In addition, in some embodiments, the insulating film further includes other regions, for example, the insulating film further includes a fourth region D, a fifth region E, a sixth region F, and a seventh region G, wherein the fourth region D is disposed adjacent to the first region a, the fifth region E is disposed adjacent to the second region B, and the fourth region D can be bent first to adhere the adhesive layer of the fourth region D to the narrow side of the single cell, and the third fold 130 is formed between the fourth region D and the first region a. The fifth region E may be bent back so that the adhesive layer of the fifth region E is adhered to the base material of the fourth region D, and the fourth fold 140 may be formed between the fifth region E and the second region B, and the fourth region D and the fifth region E may form a stacked structure, which is referred to as a first stacked structure covering the narrow side surface of the unit cell, and a stacked structure formed by the first region a, the second region B, and the third region C (referred to as a second stacked structure) may be located outside the first stacked structure, for convenience of description, and specifically, the base material of the second region B may be adhered to the base material of the fifth region E.

In some embodiments, in combination with the above-mentioned folding, the fourth region D, the fifth region E, the sixth region F and the seventh region G are divided as shown in fig. 1, the third folding 130, the first bending section 143, the first outer side edge 180 (specifically, the main section 181 on the left side of the concave section 182) and the second outer side edge 190 on the left side define the fourth region D, and the fourth region D is disposed adjacent to the first region a. The seventh crease 170, the third bend 145, the first outer side 180 (specifically, the main body section 181 on the right side of the recessed section 182), and the second outer side 190 on the right side define a fifth area E, which is disposed adjacent to the third area C. The fifth crease 150, the sixth crease 160 and the second bending section 144 define a sixth area F, the fifth crease 150, the first bending section 143 and the left second outer side edge 190 define a seventh area G, and the sixth crease 160, the third bending section 145 and the right second outer side edge 190 define an eighth area H.

It should be noted that in different embodiments, the notch defined by the concave section 182 has different shapes, for example, in the embodiment shown in fig. 2 to 4, the concave section 182 includes a first straight line section 1821 and a second straight line section 1822, a lower end of the first straight line section 1821 intersects a lower end of the second straight line section 1822 at a first point 1823, and the first straight line section 1821 and the second straight line section 1822 both extend to the main body section 181, so as to define a triangular notch, wherein an included angle between the first straight line section 1821 and the main body section 181 may be set smaller than an included angle between the second straight line section 1822 and the main body section 181, for example, the first straight line section 1821 is inclined with respect to the main body section 181, the second straight line section 1822 is perpendicular to the main body section 181, and the second straight line section 1822 arranged perpendicularly may be used as a positioning reference, so as to accurately form the notch. For another example, in the embodiment shown in FIG. 5, the notch is an arc-shaped notch and correspondingly, the concave section 182 is an arc-shaped segment.

When the recessed segment 182 takes the shape of the embodiment shown in fig. 2-4, the upper end of the first fold 110 extends to the first straight segment 1821 and the upper end of the second fold 120 extends to the second straight segment 1822. When the recessed section 182 takes the shape of the embodiment shown in fig. 5, the upper ends of the first fold 110 and the second fold 120 extend onto the arc segment.

The following describes the coating process of the insulating film and the coated single battery with reference to fig. 6 to 11, taking the insulating film in the embodiment shown in fig. 1 and 2 as an example.

Referring to fig. 6, the unit cell 200 includes a bottom surface (not shown), two wide side surfaces (not shown) and two narrow side surfaces 210 (one narrow side surface is shown), and the sixth region F of the insulating film is first bonded to the bottom surface of the unit cell 200, and then the seventh region G and the eighth region H are bent so as to be bonded to the two wide side surfaces of the unit cell 200, respectively, thereby completing the primary fixing of the insulating film.

Referring to fig. 7, the fourth region D is bent along the first bending section 143 such that at least a portion of the adhesive layer of the fourth region D is adhered to at least a portion of the narrow side 210 of the unit cell 200 and the base material of the fourth region D faces upward, thereby eliminating a water inlet path between the fourth region D and the unit cell 200. At the same time, the first area a is bent along the first fold 110 such that at least a portion of the adhesive layer of the first area a is adhered to at least a portion of the adhesive layer of the third area C, thereby eliminating the water inlet path between the first area a and the third area C. The first region a and the third region C are connected to each other through the adhesive layer, and the bonding strength is higher than the bonding strength between the adhesive layer and the base material.

Referring to fig. 8, the fifth area E is bent along the third bending section 145, so that at least a portion of the adhesive layer of the fifth area E is adhered to at least a portion of the base material of the fourth area D, and the base material of the fifth area E faces upward, thereby eliminating a water inlet path between the fifth area E and the fourth area D. It should be noted that, in some embodiments, the fourth region D does not completely cover the narrow side 210 of the single battery 200, so that part of the adhesive layer of the fifth region E is adhered to at least part of the base material of the fourth region D, and another part of the adhesive layer is adhered to the narrow side 210 of the single battery 200.

Meanwhile, the second region B is bent along the second fold 120, so that at least a part of the adhesive layer of the second region B is adhered to at least a part of the base material of the first region a, thereby eliminating a water inlet path between the second region B and the first region a. It should also be noted that in some embodiments, the first area a does not completely cover the adhesive layer of the third area C, so that a part of the adhesive layer of the second area B is adhered to the base material of the first area a, and another part of the adhesive layer is adhered to the adhesive layer of the third area C.

By this step, the main water inlet paths between the insulating film and the unit cell 200 are blocked, and the adjacent two members having the risk of water inlet are connected by at least one adhesive layer, so that the separation can be effectively prevented.

Referring to fig. 9, the laminated structure formed by bonding the first, second and third regions a, B and C to each other is along the second bending section 144, so that the base material of the second region B is bonded to the base material of the fifth region E. With further reference to fig. 10, fig. 10 is an enlarged schematic view of the area ii in fig. 9, since the insulating film has a certain hardness, the first bending portion K (e.g. the round corner in the figure) of the second area B and the third area C is difficult to completely adhere, and there is still a risk of water entering, in the related art, the first bending portion K faces to the single battery, so as to be hidden inside, and difficult to close. Further, since the exposed region J is an adhesive layer, the strength of connection with the seal can be increased.

Referring to fig. 11, after the laminated structure is attached to the fifth area E, the first bending portion K is sealed by the sealing element 300 having adhesion, specifically, the sealing element 300 is bonded to the exposed area J of the second area B, and at least extends to the substrate of the first area a, and is bonded to the substrate of the first area a, it should be noted that the substrate of the sealing element 300 at least extends to the first area a is the substrate of the first area a adjacent to the first bending portion K, that is, the covering area of the sealing element 300 is larger than the exposed area J, so that it can be ensured that the sealing element 300 can necessarily seal the first bending portion K; further, the sealing material 300 is also bonded to the base material of the first region a, so that the connection strength between the sealing material 300 and the insulating film can be obtained. Since the exposed region J is an adhesive layer, the exposed region J and the seal 300 have higher bonding strength.

Referring to fig. 11, in some embodiments, the coverage of the sealing member 300 may be expanded, such that the sealing member 300 is bonded to a portion of the substrate of the fourth region D and is bonded to a portion of the substrate of the fifth region E, thereby further realizing a connection area between the sealing member 300 and the insulating film and improving waterproof performance.

Of course, the expanded region of the sealing member 300 may be bonded to a part of the base material of the fourth region D alone or to a part of the base material of the fifth region E alone.

Referring to fig. 12, based on the above embodiment, the coverage of the sealing member 300 may be further extended, specifically, the sealing member 300 is rectangular, and both sides thereof extend to the wide sides of both sides, respectively, that is, the width of the sealing member 300 is equal to the width of the narrow side 210 of the unit cell 200. Along the direction of height of battery cell 200, the upper limb of sealing member 300 is higher than the highest position of exposed area J, and the lower limb is less than the lowest position of exposed area J to guarantee to cover exposed area J completely, and can bond with the partial substrate of fourth region D and the partial substrate of fifth region E respectively in order to increase intensity, in addition, the shape rule of sealing member 300, the shaping of being convenient for. Taking the example shown in the figure, the lower edge of the sealing member 300 extends to the bottom surface, and the sealing member 300 covers the entire laminated structure, thereby further enhancing the waterproof capability.

The sealing member 300 may be a UV glue layer, have good waterproof property, and can be rapidly cured.

With continued reference to fig. 10, in addition to the risk of water entering at the first bending point K of the second region B and the third region C, there is also a certain risk of water entering at the second bending point L of the first region a and the third region C, that is, the laminated structure has two water entering positions, which increases the sealing requirement, based on which, with reference to fig. 4 and 5, the upper end of the first fold 110 and the upper end of the second fold 120 both extend to the same point, for example, when the concave section 182 includes the first straight line section 1821 and the second straight line section 1822, the upper end of the first fold 110 and the upper end of the second fold 120 both extend to the intersection point of the first straight line section 1821 and the second straight line section 1822, that is, the first point 1823. The folded state of the insulating film is shown in fig. 13, and the first bending part K intersects with the second bending part L, so that two water inlet positions coincide, and thus only a single water inlet position needs to be closed, and the sealing requirement can be reduced, or the sealing capability can be improved under the same sealing condition.

The embodiment of the utility model provides a still provides a battery module, including single cell 200, sealing member 300 and the insulating film 100 of above-mentioned each embodiment, wherein, single cell 200 includes wide side and narrow side 210, and wide side and the adjacent setting of narrow side 210 and mutually perpendicular.

The insulating film 100 covers the outer side of the single battery 200, the sixth region F is bonded to the bottom surface of the single battery 200, and the seventh region G and the eighth region H are bonded to the two wide side surfaces of the single battery 200, respectively. At least a portion of the adhesive layer of the fourth region D is adhered to at least a portion of the narrow side 210 of the unit cell 200, and at least a portion of the adhesive layer of the first region a is adhered to at least a portion of the adhesive layer of the third region C. At least a portion of the adhesive layer of the fifth region E is bonded to at least a portion of the base material of the fourth region D, and at least a portion of the adhesive layer of the first region a is bonded to at least a portion of the adhesive layer of the third region C. At least part of the base material of the second area B is attached to at least part of the base material of the fifth area E, part of the adhesive layer of the second area B is adhered to at least part of the base material of the first area a, and the other part of the adhesive layer is exposed in the direction away from the narrow side surface 210, so that the first bending part K between the second area B and the third area C is exposed outside, and sealing is facilitated.

The sealing member 300 is bonded to the exposed region J of the second region B, extends at least to the substrate of the first region a, and is bonded to the substrate of the first region a to seal the first bending portion K between the second region B and the third region C.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. The insulating film is used for coating the single battery and is characterized by comprising a base material and an adhesive layer, wherein the adhesive layer is positioned on one side of the base material;

2. The insulating film according to claim 1, wherein the first region and the third region are relatively bendable to form a first fold, the second region and the third region are relatively bendable to form a second fold, and wherein an edge of the notch includes a first linear segment and a second linear segment, the first linear segment and the second linear segment intersecting at a first point, the first fold intersecting the first linear segment, and the second fold intersecting the second linear segment.

3. The insulating film of claim 2, wherein the first fold intersects the second fold at the first point.

4. The insulating film according to claim 1, wherein the first region and the third region are relatively bendable to form a first fold, the second region and the third region are relatively bendable to form a second fold, and the first fold and the second fold intersect at a same point on an edge of the notch.

5. The insulating film according to claim 1, wherein edges of the notch are arc line segments; or the notch is a triangular notch.

6. The insulating film according to claim 1, further comprising a fourth region and a fifth region, the fourth region being provided adjacent to the first region and the fifth region being provided adjacent to the second region in the width direction, the fourth region being bendable to bond the adhesive layer of the fourth region to a narrow side of the unit cell and form a third fold between the fourth region and the first region, the fifth region being bendable to bond the adhesive layer of the fifth region to the base material of the fourth region and form a fourth fold between the fifth region and the second region, the laminated structure being bendable to bond the base material of the second region to the base material of the fifth region;

7. Battery module, its characterized in that includes:

the insulating film according to claim 6, wherein the adhesive layer of the fourth region is bonded to the narrow side surface, the adhesive layer of the fifth region is bonded to the base material of the fourth region, the adhesive layer of the first region is bonded to the adhesive layer of the third region, a part of the adhesive layer of the second region is bonded to the base material of the first region, and another part of the adhesive layer is exposed in a direction away from the narrow side surface, and the base material of the second region is bonded to the base material of the fifth region;

8. The battery module according to claim 7, wherein the sealing member is bonded to the base material of the fourth region, and/or the sealing member is bonded to the base material of the fifth region.

9. The battery module according to claim 8, wherein the sealing member is rectangular, the sealing member extends to at least the wide side surfaces on both sides in the width direction of the unit cells, and the upper edge of the sealing member is higher than the highest position of the exposed region and the lower edge of the sealing member is lower than the lowest position of the exposed region in the height direction of the unit cells.

10. The battery module according to claim 7, wherein the sealing member comprises an adhesive tape or a UV adhesive layer formed by curing.