Insulation structure, battery cell, battery pack and electronic device

Abstract

The utility model provides an insulation structure, comprising a first insulation film enclosing a first accommodation space, the first insulation film comprising a first common surface part; and the second insulating film defines a second accommodating space, the second insulating film comprises a second common surface part, at least part of the first common surface part and at least part of the second common surface part are mutually staggered, and the first accommodating space and the second accommodating space are completely separated by the first common surface part and the second common surface part together. The utility model aims to provide an insulation structure, a battery cell, a battery pack and an electronic device so as to at least ensure insulation protection of an electrode assembly.

Description

Technical Field

[0001] The utility model relates to an insulation structure, a battery core, a battery pack and an electronic device. Background Art

[0002] Prismatic aluminum-cased batteries, a common lithium-ion battery structure, are widely used in new energy vehicles and energy storage. During their preparation, when the bare cell is placed into the prismatic casing, a layer of Mylar film is applied to the outer periphery of the cell to protect it from scratches. The Mylar film is soft and flexible, typically in a ring or U-shape, and adheres to the different surfaces of the cell to protect it and provide insulation, preventing direct contact between the cell and the metal casing, which could cause a short circuit. Utility Model Content

[0003] In view of the problems existing in the related art, the purpose of the present invention is to provide an insulation structure, a battery cell, a battery pack and an electronic device to at least ensure insulation protection of the electrode assembly.

[0004] To achieve the above-mentioned objectives, the present invention provides an insulating structure for wrapping a first group of electrode assemblies and a second group of electrode assemblies, comprising: a first insulating film, which encloses a first accommodating space for accommodating the first group of electrode assemblies; a second insulating film, which encloses a second accommodating space for accommodating the second group of electrode assemblies, the first insulating film and / or the second insulating film include a common part, and the common part separates the first accommodating space and the second accommodating space.

[0005] In some embodiments, the common portion includes a first common portion and a second common portion, the first common portion is a portion of the first insulating film located between the first group of electrode assemblies and the second group of electrode assemblies, and the second common portion is a portion of the second insulating film located between the first group of electrode assemblies and the second group of electrode assemblies.

[0006] In some embodiments, the first group of electrode assemblies has a first surface facing the second group of electrode assemblies, the first common portion extends along a first direction and covers a first portion of the first surface; the second common portion extends along a second direction and covers a second portion of the first surface, the first direction and the second direction are opposite, and the first direction and the second direction are both parallel to the first surface and perpendicular to the height direction of the first group of electrode assemblies, and the first common portion and the second common portion are arranged side by side in the height direction or the first direction.

[0007] In some embodiments, when the first common portion and the second common portion are arranged side by side in the height direction, the first common portion and the second common portion are butted against or partially overlapped in the height direction;

[0008] When the first common portion and the second common portion are arranged side by side in the first direction, the first common portion and the second common portion partially overlap in the first direction.

[0009] In some embodiments, the overlapping portions of the first common portion and the second common portion are bonded or overlapped.

[0010] In some embodiments, the first group of electrode assemblies has a first bottom surface on the opposite side of the electrode tab, and the first insulating film includes a first bottom surface portion covering the first bottom surface; the second group of electrode assemblies has a second bottom surface on the opposite side of the electrode tab, and the second insulating film includes a second bottom surface portion covering the second bottom surface, and the first bottom surface portion and the second bottom surface portion are integrally formed parts or at least partially overlap.

[0011] In some embodiments, the first group of electrode assemblies has a first face facing the second group of electrode assemblies, and a first side face and a second side face connected to opposite sides of the first face, the first side face and the second side face are parallel to the height direction of the first group of electrode assemblies, the first insulating film includes a first side face portion and a second side face portion respectively covering the first side face and the second side face; the second group of electrode assemblies includes a third side face and a fourth side face respectively aligned with the first side face and the second side face, the second insulating film includes a third side face portion and a fourth side face portion respectively covering the first side face and the second side face, and in the thickness direction of the first group of electrode assemblies, the first side face portion and the third side face portion are butted against or partially overlapped, and the second side face portion and the fourth side face portion are butted against or partially overlapped.

[0012] An embodiment of the present application also provides a battery cell, comprising: a shell, an insulating structure, a first group of electrode assemblies and a second group of electrode assemblies wrapped by the insulating structure and accommodated in the shell, wherein the insulating structure is any one of the above insulating structures, and the first group of electrode assemblies and the second group of electrode assemblies are respectively accommodated in a first accommodation space and a second accommodation space.

[0013] An embodiment of the present application further provides a battery pack comprising any one of the above-mentioned secondary batteries.

[0014] An embodiment of the present application further provides an electronic device including the above-mentioned battery pack.

[0015] The beneficial technical effects of the present utility model are:

[0016] The common portion of the first insulating film and / or the second insulating film in the embodiments of the present application separates the first accommodating space and the second accommodating space to provide insulation protection between the first group of electrode assemblies and the second group of electrode assemblies, thereby improving the safety of the first group of electrode assemblies and the second group of electrode assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram showing an electronic device according to an embodiment of the present application is a vehicle.

[0019] Figure 2 FIG2 shows a cross-sectional view of a battery cell according to the first embodiment of the present application.

[0020] Figure 3 A schematic diagram of the unfolded insulation structure according to the first embodiment of the present application is shown.

[0021] Figure 4 A schematic diagram of an expanded insulation structure according to a second embodiment of the present application is shown.

[0022] Figure 5 A cross-sectional view of a battery cell according to a third embodiment of the present application is shown.

[0023] Figure 6 FIG2 shows a schematic diagram of an expanded insulation structure according to a third embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to better understand the spirit of the embodiments of the present application, some preferred embodiments of the present application are further described below.

[0025] The embodiments of the present application will be described in detail below. Throughout this specification, identical or similar components and components having identical or similar functions are represented by similar reference numerals. The embodiments described herein with respect to the accompanying drawings are illustrative and diagrammatic and are intended to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.

[0026] As used herein, the terms "substantially," "substantially," and "approximately" are used to describe and illustrate small variations. When used in conjunction with an event or circumstance, the terms may refer to instances where the event or circumstance occurred precisely as well as instances where the event or circumstance occurred very approximately.

[0027] In this specification, unless otherwise specified or limited, relative terms such as "central", "longitudinal", "lateral", "front", "rear", "right", "left", "inner", "outer", "lower", "higher", "horizontal", "vertical", "above", "below", "above", "below", "top", "bottom" and their derivatives (such as "horizontally", "downwardly", "upwardly", etc.) should be interpreted as referring to the directions described in the discussion or depicted in the drawings. These relative terms are only used for convenience of description and do not require that the present application be constructed or operated in a specific orientation.

[0028] For ease of description, “first,” “second,” “third,” etc. may be used herein to distinguish different components in a figure or a series of figures. “First,” “second,” “third,” etc. are not intended to describe the corresponding components.

[0029] The Mylar film of the existing technology is usually matched with a double-core (bare cell, electrode assembly) battery cell. After the two cores are combined, they are coated and glued and fixed, without considering insulation between the cores. Especially with the development of lithium-ion battery technology, the capacity of a single battery cell is getting larger and larger, and it is no longer limited to a double-core battery cell. Four-core and even more-core battery cells are gradually put into use. For multi-core battery cells, multiple cores are wrapped in the same Mylar film, and the cores are tightly fitted together, which is not conducive to their insulation protection.

[0030] The present invention provides an electronic device 1000. For the convenience of description, the following embodiments are described by taking the electronic device 1000 as a vehicle as an example. Figure 1The vehicle is equipped with a battery pack 1002 inside. Battery pack 1002 can be located at the bottom, front, or rear of the vehicle body 1001. Battery pack 1002 can be used to power the vehicle, for example, as the vehicle's operating power source. The working portion of the electronic device 1000 is electrically connected to battery pack 1002 to obtain electrical energy. The vehicle can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, among others, but is not limited thereto. The working portion is the vehicle body, with battery pack 1002 located at the bottom of the vehicle body and providing electrical energy for the vehicle's operation and for the operation of its electrical components. However, in other embodiments, the electronic device 1000 can also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, or electric tool, among others. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, among others. The working portion can draw electrical energy from battery pack 1002 and perform corresponding operations, such as the blade rotation unit of a fan or the dust collection unit of a vacuum cleaner. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys; electric tools include metal cutting tools, grinding tools, assembly tools, and railway tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The present embodiment of the present application does not impose any particular limitation on the electronic device 1000.

[0031] Figure 2 The cross-sectional view of the battery cell 100 according to the first embodiment of the present application is shown. The battery cell 100 is, for example, a square-shell battery. The battery cell 100 includes a shell 60, an insulating structure 50 contained in the shell 60, a first electrode assembly 71 and a second electrode assembly 72 wrapped by the insulating structure 50. The first electrode assembly 70 and the second electrode assembly 72 can be as follows: Figure 2 、 Figure 5 The diagram shows two electrode assemblies, but may also include a single electrode assembly. A first insulating film 10 encloses a first accommodation space for accommodating a first electrode assembly 71, and a second insulating film 20 encloses a second accommodation space for accommodating a second electrode assembly 72. The first insulating film 10 and / or the second insulating film 20 include common portions 11 and 21, which separate the first accommodation space from the second accommodation space to provide insulation protection between the first electrode assembly 70 and the second electrode assembly 72, thereby improving the safety of the first electrode assembly 70 and the second electrode assembly 72.

[0032] The shell 60 includes a top cover, an end wall and a side wall surrounding the end wall. As long as a stable sealing and electrical connection relationship can be formed, the connection between the end wall and the side wall can be achieved in a variety of ways, such as integral stamping, integral casting or split welding. A accommodating cavity is formed in the shell 60 for accommodating the electrode assembly, electrolyte and other necessary battery components. Specifically, the size of the shell 60 can be determined according to the specific size and number of the electrode assembly. The material of the shell 60 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. In order to prevent the battery shell from rusting during long-term use, a layer of rust-proof material such as metal nickel can be plated on the surface of the shell 60.

[0033] Figure 3 A schematic diagram of the unfolded insulating structure 50 according to the first embodiment of the present application is shown. The insulating structure 50 includes a first insulating film 10 and a second insulating film 20. The first insulating film 10 and the second insulating film 20 are Mylar films. The common parts 11 and 21 include a first common part 11 and a second common part 21. The first common part 11 is the part of the first insulating film 10 located between the first group of electrode assemblies 71 and the second group of electrode assemblies 72. The second common part 21 is the part of the second insulating film 20 located between the first group of electrode assemblies 71 and the second group of electrode assemblies 72.

[0034] like Figure 3 As shown, the first insulating film 10 includes a first front portion 12, a first side portion 13, a second side portion 14, a first common surface portion 11, and a first bottom portion 15. The first side portion 13 and the second side portion 14 respectively connect the left and right opposite sides of the first front portion 12, the first common surface portion 11 connects the left side of the first side portion 13, and the first bottom portion 15 connects the lower side of the first front portion 12. The second insulating film 20 includes a second front portion 22, a third side portion 23, a fourth side portion 24, a second common surface portion 21, and a second bottom portion 25. The third side portion 23 and the fourth side portion 24 respectively connect the left and right opposite sides of the second front portion 22, the second common surface portion 21 connects the right side of the fourth side portion 24, and the second bottom portion 25 connects the upper side of the second front portion 22.

[0035] In other embodiments, the common portion 11, 21 is a portion of one of the first insulating film 10 and the second insulating film 20 located between the first electrode assembly 71 and the second electrode assembly 72, and the other of the two does not have a portion located between the first electrode assembly 71 and the second electrode assembly 72, and the common portion 11, 21 can completely separate the first electrode assembly 71 and the second electrode assembly 72. That is, corresponding to Figure 3, there is no second common part 21, and the size of the first common part 11 is greater than or equal to the size of the first front part 12; or there is no first common part 11, and the size of the second common part 21 is greater than or equal to the size of the second front part 22.

[0036] In the Figure 3 When the unfolded insulating structure 50 is shown wrapping the first and second electrode assemblies 71, 72, the first electrode assembly 71 can be placed on the first front portion 12, with its first bottom facing the first bottom portion 15 and its tabs facing away from the first bottom portion 15. The first and second side portions 13, 14 are folded over the opposing first and second side surfaces of the first electrode assembly 71, and then the first common surface portion 11 is folded over the first surface of the first electrode assembly 71 facing away from the first front portion 12. The second electrode assembly 72 can be placed on the second front portion 22, with its second bottom facing the second bottom portion 25 and its tabs facing away from the second bottom portion 25. The third and fourth side portions 23, 24 are folded over the opposing third and fourth side surfaces of the second electrode assembly 72, and then the second common surface portion 21 is folded over the second electrode assembly 72. With the first bottom surface portion 15 and the second bottom surface portion 25 as the bottom, the first group of electrode assemblies 71 and the second group of electrode assemblies 72 are stood up and merged. At this time, the third side surface and the fourth side surface of the second group of electrode assemblies 72 are aligned with the first side surface and the second side surface of the first group of electrode assemblies 71, respectively. The first bottom surface and the second bottom surface of the first group of electrode assemblies 71 and the second group of electrode assemblies 72 are wrapped by the first bottom surface portion 15 and the second bottom surface portion 25. The pole ears of the first group of electrode assemblies 71 and the second group of electrode assemblies 72 are facing upward. The first common surface portion 11 and the second common surface portion are located between the first group of electrode assemblies 71 and the second group of electrode assemblies 72 to isolate the first group of electrode assemblies 71 and the second group of electrode assemblies 72.

[0037] The first bottom surface 15, the first front portion 12, the first side portion 13, the second side portion 14, the first common surface portion 11, and the second common surface portion 21 form a first accommodation space for accommodating the first electrode assembly 71. The second bottom surface 25, the second front portion 22, the third side portion 23, the fourth side portion 24, the first common surface portion 11, and the second common surface portion 21 form a second accommodation space for accommodating the second electrode assembly 72. The first common surface portion 11 and the second common surface portion 21 together form a complete protective layer, completely separating the first accommodation space from the second accommodation space, and providing insulation protection between the first electrode assembly 71 and the second electrode assembly 72.

[0038] Continue to see Figure 2 The first surface of the first electrode assembly 71 faces the surface of the second electrode assembly 72. The first common portion 11 extends along a first direction D1 and covers the first portion of the first surface. The second common portion extends along a second direction D2 and covers the second portion of the first surface. The first direction D1 and the second direction D2 are opposite, and both the first direction D1 and the second direction D2 are parallel to the first surface and perpendicular to the height direction of the first electrode assembly 71. The first common portion 11 and the second common portion 21 are arranged side by side in the height direction. In the first direction D1, the first common surface portion 11 extends to a size greater than 1 / 2 of the size of the first front portion 12. In the second direction D2, the second common surface portion 21 extends to a size greater than 1 / 2 of the size of the second front portion 22. This allows at least portions of the first common surface portion 11 and the second common surface portion 21 to overlap. At the overlapping location, they are overlapped or bonded to each other to prevent insulation defects. The remaining portions of the first common surface portion 11 and the second common surface portion 21 are staggered.

[0039] In other embodiments, the first common surface portion 11 and the second common surface portion 21 are butted against each other without overlapping, and the first common surface portion 11 and the second common surface portion 21 completely cover the first surface of the first group of electrode assemblies 71 facing the second group of electrode assemblies 72, thereby reducing the thickness of the insulating film while ensuring the insulation effect and saving the material used for the insulating film.

[0040] In the thickness direction T of the first group of electrode assemblies 71 and the second group of electrode assemblies 72, the size of the second side portion 14 is larger than the size of the first side portion 13, and larger than the thickness of the first group of electrode assemblies 71, and the size of the third side portion 23 is larger than the size of the fourth side portion 24, and larger than the thickness of the second group of electrode assemblies 72, so that the first side portion 13 and the third side portion 23 at least partially overlap, and the edge of the third side portion 23 covers and overlaps the first side portion 13, and the fourth side portion 24 and the second side portion 14 at least partially overlap, and the edge of the fourth side portion 24 covers and overlaps the second side portion 14. This provides space for deviations and errors that may occur during the folding process, avoiding inadequate insulation.

[0041] In other embodiments, the first side portion 13 and the third side portion 23 are butted against each other without overlapping, the first side portion 13 completely covering the first side of the first electrode assembly 71, and the third side portion 23 completely covering the third side of the second electrode assembly 72. The fourth side portion 24 and the second side portion 14 are butted against each other without overlapping, the second side portion 14 completely covering the second side of the first electrode assembly 71, and the fourth side portion 24 completely covering the fourth side of the second electrode assembly 72. This ensures insulation effect while reducing the thickness of the insulating film and saving the material used for the insulating film.

[0042] Likewise, in the thickness direction T of the first electrode assembly 71 and the second electrode assembly 72, the size of the first bottom portion 15 (in Figure 3 The size in the vertical direction) is larger than the size of the first side portion 13 (in Figure 3 The size of the second bottom surface portion 25 (i.e., the size in the left-right direction) is greater than the thickness of the first electrode assembly 71. Figure 3 The size in the vertical direction) is larger than the size of the fourth side portion 24 (in Figure 3 The dimension in the left-right direction is greater than the thickness of the second electrode assembly 72, so that at least parts of the first bottom portion 15 and the second bottom portion 25 overlap and overlap.

[0043] The insulating structure 50 also includes an adhesive layer 26, which is located between the surfaces at the above-mentioned overlapping positions to provide adhesion, and the above-mentioned excess dimensions of the first common surface portion 11, the second side portion 14, the third side portion 23, the second common surface portion 21, the first bottom surface portion 15 and the second bottom surface portion 25 are used to set the adhesive layer 26 at the edge to play a good bonding and fixing role, so that the adjacent parts of the first insulating film 10 and the second insulating film 20 can effectively cooperate to form a whole, thereby completely and tightly wrapping the first group of electrode assemblies 71 and the second group of electrode assemblies 72.

[0044] Figure 4 The schematic diagram of the expanded insulating structure 50 according to the second embodiment of the present application is shown, and the cross-sectional view of the battery cell 100 of the second embodiment is similar to that of the battery cell 100 of the second embodiment. Figure 2 The first bottom portion 15 and the second bottom portion 25 are formed as an integrally formed part. In the second embodiment, the first insulating film 10 and the second insulating film 20 are formed as an integrally formed part, which eliminates the need to attach the first bottom portion 15 and the second bottom portion 25 together via the adhesive layer 26 and saves space occupied by the adhesive layer 26.

[0045] Figure 5 1 shows a cross-sectional view of a battery cell 100 according to a third embodiment of the present application. Figure 6FIG2 shows a schematic diagram of an expanded insulating structure 50 according to a third embodiment of the present application. The difference between the third embodiment and the first embodiment is that the first common portion 11 and the second common portion 21 are arranged side by side in the first direction D1. The size of the first common surface portion 11 (in the height direction of the first electrode assembly 71 and the second electrode assembly 72) is Figure 6 The dimension of the first common surface portion 11 (i.e., the dimension in the vertical direction) is greater than or equal to 1 / 2 of the dimension of the first side surface portion 13 (i.e., the height of the first and second electrode assemblies 71, 72), and the dimension of the second common surface portion 21 is greater than or equal to 1 / 2 of the dimension of the fourth side surface portion 24. Therefore, the first common surface portion 11 and the second common surface portion 21 are butted together at a position midway between the heights of the first and second electrode assemblies 71, 72. In an embodiment where the dimension of the first common surface portion 11 is equal to 1 / 2 of the dimension of the first side surface portion 13, and the dimension of the second common surface portion 21 is equal to 1 / 2 of the dimension of the fourth side surface portion 24, the first common surface portion 11 and the second common surface portion 21 are directly butted together to form a complete isolation layer for separating the first and second electrode assemblies 71, 72. In an embodiment where the dimension of the first common surface portion 11 is greater than 1 / 2 of the dimension of the first side surface portion 13, and the dimension of the second common surface portion 21 is greater than 1 / 2 of the dimension of the fourth side surface portion 24, the first common surface portion 11 and the second common surface portion 21 partially overlap, and an adhesive layer 26 may be provided therebetween to bond the overlapping portions.

[0046] Also, see Figure 5 Along the first direction D1, the first common surface portion 11 may extend beyond the first front portion 12, and an adhesive layer 26 may be provided at the portion where the edge exceeds the portion. The adhesive layer 26 on the first common surface portion 11 and the adhesive layer 26 on the second side portion 14 are bonded together to the fourth side portion 24. Along the second direction D2, the second common surface portion 21 may extend beyond the second front portion 22, and an adhesive layer 26 may be provided at the portion where the edge exceeds the portion. The adhesive layer 26 on the second common surface portion 21 and the adhesive layer 26 on the third side portion 23 are bonded together to the first side portion 13.

[0047] The embodiment of the present application is directed to a battery cell 100 having multiple electrode assemblies, and provides an insulating structure 50 that can wrap the first group of electrode assemblies 71 and the second group of electrode assemblies 72 respectively, thereby preventing scratches when the electrode assemblies are placed in the shell 60, and insulating the electrode assemblies from the shell 60. Through the cooperation between the first common surface portion 11 and the second common surface portion 21, an insulating protection function is played between the first group of electrode assemblies 71 and the second group of electrode assemblies 72, thereby improving the safety of the electrode assemblies.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An insulating structure for wrapping a first electrode assembly and a second electrode assembly, characterized in that: include: a first insulating film, enclosing a first accommodation space for accommodating the first group of electrode assemblies; The second insulating film encloses a second accommodating space for accommodating the second group of electrode assemblies. The first insulating film and / or the second insulating film include a common portion, and the common portion separates the first accommodating space and the second accommodating space.

2. The insulation structure according to claim 1, characterized in that: The common portion includes a first common portion and a second common portion, wherein the first common portion is a portion of the first insulating film located between the first group of electrode assemblies and the second group of electrode assemblies, and the second common portion is a portion of the second insulating film located between the first group of electrode assemblies and the second group of electrode assemblies.

3. The insulation structure according to claim 2, characterized in that: The first electrode assembly has a first surface facing the second electrode assembly, and the first common portion extends along a first direction and covers a first portion of the first surface. The second common portion extends along the second direction and covers the second portion of the first surface, The first direction and the second direction are opposite to each other, and both the first direction and the second direction are parallel to the first surface and perpendicular to the height direction of the first group of electrode assemblies. The first common portion and the second common portion are arranged side by side in the height direction or the first direction.

4. The insulation structure according to claim 3, characterized in that: When the first common portion and the second common portion are arranged side by side in the height direction, the first common portion and the second common portion are butted against or partially overlapped in the height direction; When the first common portion and the second common portion are arranged side by side in the first direction, the first common portion and the second common portion partially overlap in the first direction.

5. The insulation structure according to claim 4, characterized in that: The overlapping parts of the first common part and the second common part are bonded or overlapped.

6. The insulation structure according to claim 1, characterized in that The first electrode assembly has a first bottom surface opposite to the tab, and the first insulating film includes a first bottom surface portion covering the first bottom surface; The second electrode assembly has a second bottom surface opposite to the tab, and the second insulating film includes a second bottom surface portion covering the second bottom surface. The first bottom portion and the second bottom portion are an integrally formed part or at least partially overlap.

7. The insulation structure according to claim 1, characterized in that: The first electrode assembly comprises a first surface facing the second electrode assembly, and a first side surface and a second side surface connecting two opposite sides of the first surface, the first side surface and the second side surface being parallel to a height direction of the first electrode assembly, and the first insulating film comprises a first side surface portion and a second side surface portion covering the first side surface and the second side surface, respectively; The second group of electrode assemblies includes a third side surface and a fourth side surface aligned with the first side surface and the second side surface, respectively; the second insulating film includes a third side surface portion and a fourth side surface portion covering the first side surface and the second side surface, respectively; In the thickness direction of the first group of electrode assemblies, the first side surface portion and the third side surface portion are butted against or partially overlapped, and the second side surface portion and the fourth side surface portion are butted against or partially overlapped.

8. A battery cell, characterized in that: include: a housing, an insulating structure, a first set of electrode assemblies and a second set of electrode assemblies wrapped by the insulating structure and accommodated in the housing, The insulating structure is the insulating structure according to any one of claims 1 to 7, and the first group of electrode assemblies and the second group of electrode assemblies are respectively accommodated in the first accommodation space and the second accommodation space.

9. A battery pack, characterized in that: Including the battery cell according to claim 8.

10. An electronic device, characterized in that: A battery pack comprising the battery pack according to claim 9.

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