Bare cell insulation sheet, cell assembly, battery and power utilization device
By designing a bare-cell insulating sheet with a folded structure, the problems of many parts, many assembly steps and low energy density caused by the bottom bracket in the existing battery assembly process are solved, and a lower cost and higher energy density battery is achieved assembly.
Patent Information
- Application Number
- CN202420112029.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-17
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-01-17
AI Technical Summary
In the existing battery assembly process, the hot melt base plate on the insulating film leads to many parts and assembly steps, high costs, and affects the energy density of the battery.
A bare cell insulating sheet is designed to wrap the bare cell through a folding structure of the bottom area, the first side area and the second side area to avoid contact with the battery case and omit the bottom bracket.
Effectively prevent the bare battery cell from contacting the battery housing, reduce assembly steps and parts, reduce costs, and increase the energy density of the battery.
Smart Images
Figure CN222463370U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy, and in particular to a bare battery core insulating sheet, a battery core assembly, a battery and an electrical device. Background Art
[0002] In the related art, a battery usually includes a shell and a cell assembly, wherein the cell assembly includes a bare cell, a top cover arranged at the end of the bare cell, an insulating film covering the bare cell, and a bottom support plate fixed by hot-melt to the end of the insulating film away from the top cover. When assembling the battery, the assembled cell assembly is loaded into the shell from the opening of the shell, and the top cover is used to close the opening of the shell, wherein the main function of the insulating film is to achieve insulation separation between the bare cell and the shell, and the bottom support plate can be located outside or inside the insulating film, and its main function is to cushion the cell and prevent the cell from contacting the aluminum shell. In practical applications, hot-melting the bottom support plate on the insulating film will result in more parts and components of the cell assembly and more steps in the assembly process, resulting in high cost, and the bottom support plate will occupy the space of the shell, resulting in the height of the bare cell being compressed, which affects the further improvement of the energy density of the battery. Utility Model Content
[0003] Based on this, it is necessary to provide a bare cell insulation sheet, which can effectively prevent the cell from contacting the aluminum shell, so as to omit the bottom support plate.
[0004] A bare cell insulating sheet, wherein the bare cell has a bottom surface and an outer peripheral surface connected to the bottom surface, wherein the outer peripheral surface has two opposite first surfaces and two opposite second surfaces, comprising:
[0005] A bottom area, used to wrap the bottom surface of the bare battery cell, the bottom area having two first sides and two second sides, the two first sides are respectively arranged corresponding to the two first surfaces, and the two second sides are respectively arranged corresponding to the two second surfaces;
[0006] two first side regions, respectively arranged corresponding to the two first sides, the first side region is U-shaped, and comprises a main body portion and two edge portions, the main body portion is connected to the first side and can be folded relative to the first side to wrap the first surface, and the two edge portions are respectively arranged corresponding to the two second surfaces and respectively connected to opposite sides of the main body portion; and
[0007] Two second side regions are respectively arranged corresponding to the two second edges, the second side regions are connected to the second edges and can be folded relative to the second edges to wrap the second surface, wherein the second side regions are connected to the edge portions.
[0008] In one embodiment, one of the second side region and the edge portion has a protrusion, and the other has a buckling hole, and the second side region and the edge portion are buckled together through the protrusion and the buckling hole.
[0009] In one embodiment, there are multiple protrusions and multiple snap-fit holes, and they are arranged at intervals along the height direction of the bare battery cell, and the multiple protrusions are snap-fitted with the multiple snap-fit holes one-to-one.
[0010] In one embodiment, the edge portion has a plurality of the snap-fitting holes arranged at intervals along the height direction of the bare battery cell, and the area of the second side region corresponding to the edge portion has a plurality of the protrusions, and the plurality of the protrusions are snap-fitted one-to-one with the plurality of the snap-fitting holes.
[0011] In one embodiment, the bottom area, the first side area and the second side area all have a hardness of 40-80SH.
[0012] In one embodiment, the thickness of the bottom area, the first side area and the second side area are all 0.1-2.0 mm; and / or
[0013] The first side region further includes two chamfered portions connecting the main body portion and the edge portion.
[0014] In one embodiment, the second surface is a large surface of the bare battery cell.
[0015] The utility model also provides a battery core assembly, comprising:
[0016] Bare battery cells;
[0017] A top cover, disposed at the end of the bare cell, the top cover comprising a top cover sheet and a lower insulating member disposed on the top cover sheet; and
[0018] The above-mentioned bare cell insulating sheet is wrapped on the bare cell, and the end of the lower insulating member away from the top cover is located inside the bare cell insulating sheet, and the outer peripheral wall of the lower insulating member is fitted with the inner peripheral wall of the bare cell insulating sheet, and the end face of the bare cell insulating sheet close to the top cover is fitted with the top cover sheet.
[0019] The utility model also provides a battery, comprising:
[0020] a housing having an opening; and
[0021] In the above-mentioned battery cell assembly, the bare battery cell and the bare battery cell insulating sheet are arranged in the shell, and the top cover sheet is connected to the shell and closes the opening of the shell.
[0022] The utility model also provides an electric device, comprising the battery.
[0023] In the above-mentioned bare cell insulation sheet, the bottom area, the two first side areas and the two second side areas can wrap the bare cell by folding, so as to prevent the bare cell from contacting with the battery shell. At the same time, the first side area is U-shaped and includes a main body and two edge parts. The main body is used to wrap the bare first surface, and the two edge parts are respectively arranged corresponding to the two second surfaces. The second side area is used to wrap the second surface, and the two sides of each second side area are respectively connected to the two edge parts, which can strengthen the connection between the first side area and the second side area, so as to better wrap the bare cell. Therefore, the above-mentioned bare cell insulation sheet can still effectively prevent the bare cell from contacting with the battery shell under the condition of omitting the bottom support plate. By omitting the bottom support plate, the step of hot-melt fixing the bottom support plate and the bare cell insulation sheet can be omitted, that is, the steps of parts and assembly process can be reduced, thereby reducing costs and reducing resource waste. Moreover, omitting the bottom support plate can avoid the situation where the height of the bare cell is compressed due to the bottom support plate occupying the space of the shell, which affects the further improvement of the energy density of the battery.
[0024] Moreover, in the above-mentioned bare cell insulation sheet, since the first side area is U-shaped and includes a main body and two edge parts, the main body is used to wrap the bare first surface, the two edge parts are respectively arranged corresponding to the two second surfaces, and the second side area is used to wrap the second surface, and the two sides of each second side area are respectively connected to the two edge parts, so that the above-mentioned bare cell insulation sheet can be folded and erected so that the opening of the bare cell insulation sheet fits the top cover sheet and the lower insulating part of the battery, and no hot melt fixation is required, that is, the connection between the bare cell insulation sheet and the top cover can maintain a predetermined shape, effectively preventing the bare cell from contacting the battery shell. The elimination of the hot melt fixation step of the bare cell insulation sheet and the top cover can avoid the bare cell insulation sheet and the top cover being misaligned during the hot melt process due to equipment accuracy, material or hot melt error, thereby avoiding the bare cell insulation sheet that is misaligned outward in the subsequent laser welding process of the top cover and the shell from being introduced into the laser welding position of the top cover, causing welding explosion points. Moreover, eliminating the hot-melt fixing step of the bare cell insulating sheet and the top cover can also avoid the formation of wiredrawing due to excessively high hot-melt temperature or excessively long time, thereby avoiding the situation where the wiredrawing is clamped into the laser welding position of the top cover and causes welding explosion points.
[0025] In addition, the above-mentioned bare cell insulating sheet can wrap the bare cell by folding and standing up, which is not easy to form wrinkles. Compared with wrapping the bare cell with an insulating film that is easy to form wrinkles, it can increase the electrolyte infiltration speed of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 It is a schematic diagram of the structure of a battery in a preferred embodiment of the utility model;
[0028] Figure 2 For along Figure 1 The cross-section diagram of line AA in ;
[0029] Figure 3 for Figure 2 A partial enlarged view of
[0030] Figure 4 An exploded view of a battery cell assembly in a preferred embodiment of the utility model;
[0031] Figure 5 for Figure 4 A further exploded view of the battery cell assembly is shown;
[0032] Figure 6 It is a schematic diagram of the folded structure of the bare battery core insulating sheet in a preferred embodiment of the utility model;
[0033] Figure 7 for Figure 6 An exploded view of the bare cell insulation sheet is shown;
[0034] Figure 8 for Figure 7 A further exploded view of the bare cell insulation sheet is shown;
[0035] Fig. 9 for Figure 6 A top view of the bare cell insulating sheet shown;
[0036] Fig.10 For along Fig. 9 The cross-sectional view of line BB in ;
[0037] Fig.11 for Fig.10 A local enlarged view of point C in the figure. DETAILED DESCRIPTION
[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0044] like Figure 1-Figure 3 As shown, a battery 10 in a preferred embodiment of the utility model. The battery 10 includes a shell 10a and a battery cell assembly 10b. The shell 10a has an opening. The battery cell assembly 10b includes a bare battery cell 200, a top cover 300 and a bare battery cell insulating sheet 400. The top cover 300 is disposed at the end of the bare battery cell 200. The bare battery cell insulating sheet 400 is coated on the bare battery cell 200. The bare battery cell 200 and the bare battery cell insulating sheet 400 of the battery cell assembly 10b are disposed in the shell 10a, and the top cover 300 is connected to the shell 10a and closes the opening of the shell 10a. Specifically, in the present embodiment, the battery 10 is a secondary battery.
[0045] In this embodiment, the top cover 300 includes a top cover sheet 310 and a lower insulating member 320 disposed on the top cover sheet 310. One end of the lower insulating member 320 away from the top cover 300 is located in the bare cell insulating sheet 400. Specifically, in this embodiment, the top cover sheet 310 and the housing 10a are fixed by laser welding, thereby realizing the connection between the top cover 300 and the housing 10a.
[0046] In this embodiment, if Figure 4-Figure 11 As shown, the bare cell 200 has a bottom surface 202 and an outer peripheral surface connected to the bottom surface 202. The outer peripheral surface has two opposite first surfaces 204 and two opposite second surfaces 206.
[0047] The bare cell insulating sheet 400 includes a bottom area 402, two first side areas 404 and two second side areas 406. The bottom area 402 is used to wrap the bottom surface 202 of the bare cell 200. The bottom area 402 has two first edges 402a and two second edges 402b. The two first edges 402a are respectively arranged corresponding to the two first surfaces 204. The two second edges 402b are respectively arranged corresponding to the two second surfaces 206.
[0048] The two first side regions 404 are respectively arranged corresponding to the two first edges 402a. The first side region 404 is U-shaped. The first side region 404 includes a main body 4042 and two edge portions 4044. The main body 4042 is connected to the first edge 402a and can be folded relative to the first edge 402a to wrap the bare first surface 204. The two edge portions 4044 are respectively arranged corresponding to the two second surfaces 206 and are respectively connected to the opposite sides of the main body 4042.
[0049] The two second side regions 406 are respectively arranged corresponding to the two second edges 402b. The second side regions 406 are connected to the second edges 402b and can be folded relative to the second edges 402b to wrap the second surface 206. The second side regions 406 are connected to the edge portion 4044.
[0050] In the above-mentioned bare cell insulation sheet 400, the bottom area 402, the two first side areas 404 and the two second side areas 406 can wrap the bare cell 200 by folding, so as to prevent the bare cell 200 from contacting the shell 10a of the battery 10. At the same time, the first side area 404 is U-shaped and includes a main body 4042 and two edge parts 4044. The main body 4042 is used to wrap the bare first surface 204, and the two edge parts 4044 are respectively arranged corresponding to the two second surfaces 206. The second side area 406 is used to wrap the second surface 206, and the two sides of each second side area 406 are respectively connected to the two edge parts 4044, which can strengthen the connection between the first side area 404 and the second side area 406, so as to better wrap the bare cell 200. Therefore, the above-mentioned bare cell insulation sheet 400 can still effectively prevent the bare cell 200 from contacting the shell 10a of the battery 10 under the condition of omitting the bottom support plate. By omitting the bottom tray, the step of hot-melt fixing the bottom tray and the bare cell insulating sheet 400 can be omitted, which means that the parts and assembly process steps can be reduced, thereby reducing costs and reducing waste of resources. In addition, by omitting the bottom tray, the height of the bare cell 200 can be avoided from being compressed due to the bottom tray occupying the space of the shell 10a, thereby affecting the further improvement of the energy density of the battery 10.
[0051] Moreover, in the above-mentioned bare cell insulating sheet 400, since the first side area 404 is U-shaped and includes a main body 4042 and two edge parts 4044, the main body 4042 is used to wrap the bare first surface 204, and the two edge parts 4044 are respectively arranged corresponding to the two second surfaces 206, and the second side area 406 is used to wrap the second surface 206, and the two sides of each second side area 406 are respectively connected to the two edge parts 4044, so that the above-mentioned bare cell insulating sheet 400 can be folded and erected so that the opening of the bare cell insulating sheet 400 fits the top cover sheet 310 and the lower insulating member 320 of the battery 10, and no hot melt fixing is required, that is, the connection between the bare cell insulating sheet 400 and the top cover 300 can maintain a predetermined shape, effectively preventing the bare cell 200 from contacting the shell 10a of the battery 10. Eliminating the hot-melt fixing step of the bare cell insulation sheet 400 and the top cover 300 can avoid the bare cell insulation sheet 400 being misaligned with the top cover 300 during the hot-melt process due to equipment accuracy, material or hot-melt error, thereby avoiding the bare cell insulation sheet 400 that is misaligned outward from being introduced into the laser welding position of the top cover 300 in the subsequent laser welding process of the top cover 300 and the shell 10a, causing welding explosion points. In addition, eliminating the hot-melt fixing step of the bare cell insulation sheet 400 and the top cover 300 can also avoid the formation of wire drawing due to excessively high hot-melt temperature or excessively long time, thereby avoiding the occurrence of wire drawing clamped into the laser welding position of the top cover 300 and causing welding explosion points.
[0052] In addition, the bare cell insulating sheet 400 can wrap the bare cell 200 by folding and standing up, which is not easy to form wrinkles. Compared with wrapping the bare cell 200 with an insulating film that is easy to form wrinkles, it can increase the electrolyte infiltration speed of the battery 10.
[0053] In this embodiment, one of the second side region 406 and the edge portion 4044 has a protrusion 408, and the other has a buckling hole 409. The second side region 406 and the edge portion 4044 are buckled through the protrusion 408 and the buckling hole 409. In this way, the connection between the second side region 406 and the edge portion 4044 can be very simple and convenient. It can be understood that in other embodiments, the second side region 406 and the edge portion 4044 can also be connected by gluing.
[0054] In this embodiment, there are multiple protrusions 408 and multiple snap-fit holes 409, and they are arranged at intervals along the height direction of the bare battery cell 200. Multiple protrusions 408 are snapped with multiple snap-fit holes 409 one-to-one. In this way, the second side area 406 can be firmly connected to the edge portion 4044, and the multiple protrusions 408 and multiple snap-fit holes 409 are arranged at intervals along the height direction of the bare battery cell 200, which can make the width of the edge portion 4044 smaller, thereby helping to reduce the space occupied by the bare battery cell insulating sheet 400 in the shell 10a. It can be understood that in other embodiments, there is also one protrusion 408 and one snap-fit hole 409.
[0055] Specifically, in the present embodiment, the edge portion 4044 has a plurality of snap-fit holes 409 arranged at intervals along the height direction of the bare cell 200, and the area corresponding to the second side area 406 and the edge portion 4044 has a plurality of protrusions 408, and the plurality of protrusions 408 snap-fit with the plurality of snap-fit holes 409 one-to-one. That is, in the present embodiment, the protrusions 408 are located on the second side area 406 with a larger area, and the snap-fit holes 409 are located on the edge portion 4044 with a smaller area, so that it is more convenient for the staff to snap-fit the second side area 406 and the edge portion 4044. It is understandable that in other embodiments, the snap-fit holes 409 may also be located on the second side area 406 with a larger area, and the protrusions 408 may be located on the edge portion 4044 with a smaller area.
[0056] In this embodiment, the hardness of the bottom area 402, the first side area 404 and the second side area 406 are all 40-80SH. In this way, when the thickness of the bottom area 402, the first side area 404 and the second side area 406 is small, the bare cell insulation sheet 400 can also be folded and erected so that the opening of the bare cell insulation sheet 400 fits the top cover sheet 310 and the lower insulation member 320 of the battery 10, without the need for hot melt fixing, and can be folded and erected to wrap the bare cell 200, which is not easy to form wrinkles.
[0057] In this embodiment, the thickness of the bottom area 402, the first side area 404 and the second side area 406 are all 0.1-2.0 mm, which is helpful to reduce the space occupied by the bare cell insulation sheet 400 in the housing 10a.
[0058] In this embodiment, the first side area 404 further includes two chamfered portions 4046, and the chamfered portions 4046 connect the main body 4042 and the edge portion 4044. In this way, the bare cell 200 can be better wrapped, so the bare cell insulation sheet 400 can still effectively prevent the bare cell 200 from contacting the housing 10a of the battery 10 when the bottom support plate is omitted.
[0059] In the present embodiment, the second surface 206 is the large surface of the bare cell 200. In this way, the bare cell 200 can be better wrapped, so the above-mentioned bare cell insulation sheet 400 can still effectively prevent the bare cell 200 from contacting the shell 10a of the battery 10 under the condition of omitting the bottom support plate. It can be understood that in other embodiments, the second surface 206 is the small surface of the bare cell 200. It should be noted that in the present embodiment, the bare cell 200 is square, and the surface with the largest area on the outer peripheral surface of the bare cell 200 is the large surface, and the surface with a smaller area is the small surface.
[0060] In this embodiment, if Figure 3 As shown, in the battery cell assembly 10b, the end of the lower insulating member 320 away from the top cover 300 is located inside the bare cell insulating sheet 400, and the outer peripheral wall of the lower insulating member 320 is in contact with the inner peripheral wall of the bare cell insulating sheet 400, and the end surface of the bare cell insulating sheet 400 close to the top cover 300 is in contact with the top cover sheet 310. In this way, there is no need to fix the bare cell insulating sheet 400 and the top cover 300 by hot melting, that is, the connection between the bare cell insulating sheet 400 and the top cover 300 can be kept in a predetermined shape, effectively preventing the bare cell 200 from contacting the shell 10a of the battery 10.
[0061] The utility model also provides an electric device, which includes the battery 10 mentioned above, and the battery 10 can provide electric energy for the electric device.
[0062] Among them, the above-mentioned electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, jumping machines, etc. This application does not impose special restrictions on the above-mentioned electrical devices.
[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0064] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A bare cell insulating sheet, wherein the bare cell has a bottom surface and an outer peripheral surface connected to the bottom surface, wherein the outer peripheral surface has two opposite first surfaces and two opposite second surfaces, characterized in that: include: A bottom area, used to wrap the bottom surface of the bare battery cell, the bottom area having two first sides and two second sides, the two first sides are respectively arranged corresponding to the two first surfaces, and the two second sides are respectively arranged corresponding to the two second surfaces; Two first side areas are respectively arranged corresponding to the two first sides, the first side area is U-shaped, and the first side area includes a main body and two edge parts, the main body is connected to the first side and can be folded relative to the first side to wrap the first surface, and the two edge parts are respectively arranged corresponding to the two second surfaces and are respectively connected to opposite sides of the main body; as well as Two second side regions are respectively arranged corresponding to the two second edges, the second side regions are connected to the second edges and can be folded relative to the second edges to wrap the second surface, wherein the second side regions are connected to the edge portions.
2. The bare cell insulating sheet according to claim 1, characterized in that: One of the second side area and the edge portion has a protrusion, and the other has a buckling hole, and the second side area and the edge portion are buckled together through the protrusion and the buckling hole.
3. The bare cell insulating sheet according to claim 2, characterized in that: There are multiple protrusions and multiple buckling holes, and they are arranged at intervals along the height direction of the bare battery cell. The multiple protrusions buckle with the multiple buckling holes one by one.
4. The bare cell insulating sheet according to claim 2, characterized in that: The edge portion has a plurality of the snap-fitting holes arranged at intervals along the height direction of the bare battery core, and the second side area and the area corresponding to the edge portion have a plurality of the protrusions, and the plurality of the protrusions are snap-fitted with the plurality of the snap-fitting holes one-to-one.
5. The bare cell insulating sheet according to claim 1, characterized in that: The bottom area, the first side area and the second side area all have a hardness of 40-80SH.
6. The bare cell insulating sheet according to claim 1, characterized in that: The thickness of the bottom area, the first side area and the second side area are all 0.1-2.0 mm; and / or The first side region further includes two chamfered portions, and the chamfered portions connect the main body portion and the edge portion.
7. The bare cell insulating sheet according to claim 1, characterized in that: The second surface is the large surface of the bare battery cell.
8. A battery cell assembly, characterized in that: include: Bare battery cells; A top cover, arranged at the end of the bare cell, the top cover comprising a top cover sheet and a lower insulating member arranged on the top cover sheet; as well as The bare cell insulating sheet as described in any one of claims 1 to 7 is wrapped on the bare cell, and the end of the lower insulating member away from the top cover is located inside the bare cell insulating sheet, and the outer peripheral wall of the lower insulating member is fitted with the inner peripheral wall of the bare cell insulating sheet, and the end face of the bare cell insulating sheet close to the top cover is fitted with the top cover sheet.
9. A battery, characterized in that: include: a housing having an opening; as well as According to the battery cell assembly as described in claim 8, the bare battery cell and the bare battery cell insulation sheet are arranged in the shell, and the top cover sheet is connected to the shell and closes the opening of the shell.
10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.