Battery cell

Abstract

The utility model provides a battery cell. The battery cell comprises a shell; the electrode assembly is arranged in the shell; an insulating film wrapping the electrode assembly to insulate the case from the electrode assembly; the insulating film comprises a bottom insulating layer, the bottom insulating layer is arranged between the bottom of the electrode assembly and the bottom of the shell, and the bottom supporting plate is arranged between the bottom insulating layer and the bottom of the shell; the orthographic projection of the bottom insulating layer on the bottom supporting plate coincides with the bottom supporting plate, and a gap exists between the orthographic projection and the bottom insulating layer; the bottom insulating layer is provided with a first permeation hole, the bottom supporting plate is provided with a second permeation hole, and the orthographic projection of the first permeation hole on the bottom supporting plate does not coincide with the second permeation hole; an electrolyte passage can be constructed through the first permeation holes and the second permeation holes, it is ensured that electrolyte can uniformly permeate into the electrode assembly, and the infiltration effect on the pole piece is improved; and the blocking effect of the battery cell and the shell can be ensured, the short circuit of the electrode assembly and the shell when foreign matters exist in the shell is prevented, and the product quality of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell. BACKGROUND

[0002] The battery cell is an important component of the battery, which is usually formed by wrapping the electrode assembly with Mylar film. Based on the good insulation and barrier property of the Mylar film, the electrode assembly can be isolated from the shell by using the Mylar film to avoid direct contact between the two, thereby reducing the risk of short circuit and mechanical damage of the battery. However, due to the existence of the Mylar film, the electrolyte is difficult to penetrate through the Mylar film to the bottom of the electrode assembly, and the electrode tab in the electrode assembly is not easy to be fully soaked, which not only affects the transmission effect of the migration ion between the positive and negative electrodes, but also reduces the overall performance and cycle life of the battery. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide a battery cell to solve the above-mentioned technical problems.

[0004] In order to achieve the above purpose, the present application provides a battery cell, which comprises:

[0005] a shell;

[0006] an electrode assembly arranged in the shell;

[0007] an insulation film wrapping the electrode assembly to insulate the shell from the electrode assembly; the insulation film comprises a bottom insulation layer arranged between the bottom of the electrode assembly and the bottom of the shell,

[0008] a bottom support plate arranged between the bottom insulation layer and the bottom of the shell; the bottom insulation layer coincides with the bottom support plate in the orthographic projection of the bottom support plate, and there is a gap between the bottom insulation layer and the bottom support plate; the bottom insulation layer is provided with a first penetration hole, and the bottom support plate is provided with a second penetration hole; the first penetration hole does not coincide with the second penetration hole in the orthographic projection of the bottom support plate.

[0009] From the above, it can be seen that the electric core provided by the application, the electric core package comprises a shell, an electrode assembly, an insulation film and a bottom support plate; wherein, there is a gap between the bottom insulation layer of the stacked bottom support plate and the insulation film, by opening the first permeation hole and the second permeation hole in the bottom insulation layer and the bottom support plate respectively, the electrolyte passage can be constructed at the bottom of the electrode assembly, so that the electrolyte can fully permeate to the bottom of the electrode assembly through the electrolyte passage and fully soak it, the transmission effect of the migration ions between the positive and negative electrodes is improved, and the service life of the battery is prolonged; at the same time, since the first permeation hole opened in the bottom insulation layer does not coincide with the second permeation hole of the bottom support plate in the orthographic projection of the bottom support plate, the good barrier effect between the electrode assembly and the shell is ensured, the short circuit problem between the two when there is foreign matter in the battery is prevented, and the product quality of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0011] Figure 1 It is a structural schematic diagram of the electric core in the application;

[0012] Figure 2 It is a schematic diagram of the positional relationship between the first permeation hole and the second permeation hole in the application.

[0013] Figure 3 It is a structural schematic diagram of the insulation film in the application;

[0014] Figure 4 It is a structural schematic diagram of the bottom support plate in the application.

[0015] Explanation of reference signs:

[0016] 100, shell;

[0017] 200, electrode assembly;

[0018] 300, insulation film; 310, bottom insulation layer; 311, first permeation hole; 312, center line; 320, side insulation layer; 321, bonding part;

[0019] 400, bottom support plate; 401, second permeation hole;

[0020] 500, positioning hole. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments and drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs. The terms "first", "second" and the like used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0023] The embodiments of the present application will be described in detail below with reference to the drawings.

[0024] The electrode assembly is an important component of the battery and is formed by wrapping the electrode assembly with a Mylar film; during the manufacturing process of the battery, the exposed electrode assembly needs to be assembled into the shell to complete the preliminary assembly of the electrode assembly; in order to protect the electrode assembly from being scratched by the shell during the assembly process, a layer of Mylar film is usually coated on the surface of the electrode assembly, which can prevent the electrode assembly from directly contacting the shell after being assembled into the shell, thereby reducing the risk of short circuit and mechanical damage. Due to the existence of the Mylar film, especially when the electrolyte is injected into the shell, the existence of the Mylar film will affect the infiltration effect of the electrolyte on the electrode assembly, so that the electrolyte cannot penetrate to the bottom of the electrode assembly, and it is difficult to fully infiltrate the electrode plate of the electrode assembly, which not only affects the transmission effect of the migrated ions between the positive and negative electrodes, but also reduces the overall performance of the battery and shortens the cycle life of the battery.

[0025] Based on the technical problem that the electrode assembly is difficult to be fully infiltrated by the electrolyte, in order to improve the infiltration effect of the electrolyte on the bottom of the electrode assembly, a penetration hole can be formed in the bottom support plate and the Mylar film respectively, so that the electrolyte can penetrate into the electrode assembly through the penetration hole and infiltrate it; however, when there are foreign matters in the shell, part of the foreign matters may pass through the penetration hole and directly contact the bottom of the electrode assembly, which is easy to cause damage to the electrode assembly; if the foreign matter has conductivity, when the foreign matter contacts the electrode assembly, the electrode plate of the electrode assembly and the shell may be conducted through the foreign matter with conductivity and form a circuit closed loop, thereby increasing the risk of damage to the battery.

[0026] In view of this, the application provides an electric core, comprising a shell 100, an electrode assembly 200, an insulating film 300 and a bottom support plate 400; wherein the electrode assembly 200 is arranged in the shell 100; the insulating film 300 wraps the electrode assembly 200 to insulate the shell 100 and the electrode assembly 200; the insulating film 300 comprises a bottom insulating layer 310, which is arranged between the bottom of the electrode assembly 200 and the bottom of the shell 100, and the bottom support plate 400 is arranged between the bottom insulating layer 310 and the bottom of the shell 100; the bottom insulating layer 310 coincides with the bottom support plate 400 in orthographic projection, and there is a gap between the bottom insulating layer 310 and the bottom support plate 400; the bottom insulating layer 310 is provided with a first penetrating hole 311, and the bottom support plate 400 is provided with a second penetrating hole 401, and the first penetrating hole 311 does not coincide with the second penetrating hole 401 in orthographic projection of the bottom support plate 400.

[0027] Specifically, refer to Figures 1-4 ; wherein, Figure 1 is a structural schematic diagram of the electric core in the application; Figure 2 is the positional relationship between the first penetrating hole 311 and the second penetrating hole 401 in the application, Figure 3 is a structural schematic diagram of the insulating film 300 in the application, Figure 4 is a structural schematic diagram of the bottom support plate 400 in the application.

[0028] Specifically, the application provides an electric core, which can improve the wetting effect of electrolyte on the pole piece in the electrode assembly 200, improve the product performance and service life of the battery, and also avoid short circuit of the battery when there is foreign matter in the shell 100; as Figures 1-3 shown, the electric core comprises a shell 100, an electrode assembly 200, an insulating film 300 and a bottom support plate 400, wherein the shell 100 serves as a bearing body of the electric core, and is used for providing mounting positions for the electrode assembly 200, the insulating film 300 and the bottom support plate 400; the electrode assembly 200 is arranged in the shell 100, mainly formed by a positive pole piece and a negative pole piece, and is used for storing and releasing electric charge.

[0029] For the insulating film 300, the electrode assembly 200 is wrapped by the insulating film 300 to electrically insulate the electrode assembly 200 from the shell 100, and in particular, the insulating film 300 includes a bottom insulating layer 310, which is stacked with the bottom support plate 400 and located between the bottom of the electrode assembly 200 and the bottom of the shell 100, and the bottom insulating layer 310 is in the same projection as the bottom support plate 400, so that the bottom insulating layer 310 and the electrode assembly 200 can be supported and protected by the bottom support plate 400, which can further enhance the blocking effect between the electrode assembly 200 and the shell 100, prevent the battery from being short-circuited or damaged due to direct contact between the battery and the shell 100, and ensure the overall quality of the battery.

[0030] For the battery, as shown in Figures 1-4 the bottom insulating layer 310 is provided with a first penetration hole 311, and the bottom support plate 400 is provided with a second penetration hole 401. To improve the protection effect of the bottom support plate 400 and the bottom insulating layer 310 on the battery, the bottom insulating layer 310 is in the same projection as the bottom support plate 400. At the same time, there is a gap between the bottom insulating layer 310 and the bottom support plate 400, so that the first penetration hole 311 of the bottom insulating layer 310, the gap between the bottom support plate 400 and the bottom insulating layer 310, and the first penetration hole 311 of the bottom support plate 400 form an electrolyte passage. Due to the existence of the electrolyte passage, the electrolyte in the shell 100 can penetrate to the bottom of the electrode assembly 200 through the electrolyte passage and penetrate to the bottom of the electrode assembly 200 through the first penetration hole 311, so that the electrolyte fully wets the electrode sheet in the electrode assembly 200, thereby improving the wetting effect of the electrolyte on the electrode assembly 200, ensuring the transmission effect of the migration ions between the positive and negative electrodes, and improving the overall performance and cycle life of the battery.

[0031] In addition, for the first penetration hole 311 and the second penetration hole 401, as shown in Figures 1-4As shown, the first permeable hole 311 is arranged on the bottom cladding film, and the second permeable hole 401 is arranged on the bottom support plate 400; wherein the orthographic projection of the first permeable hole 311 on the bottom support plate 400 does not coincide with the first permeable hole 311, that is, the first permeable hole 311 and the second permeable hole 401 are distributed in a staggered manner; on the one hand, the electrolyte in the battery can penetrate into the bottom of the electrode assembly 200 through the electrolyte passage and fully soak it, so as to improve the product performance of the battery; on the other hand, the bottom support plate 400 can block the first permeable hole 311, and the bottom insulating layer 310 can block the second permeable hole 401, so as to block the foreign matter or impurities in the shell 100, avoid the foreign matter from contacting the electrode assembly 200 through the first permeable hole 311 and the second permeable hole 401, not only can prevent the electrode assembly 200 from being damaged, but also can avoid the short circuit between the electrode assembly 200 and the shell 100 through the foreign matter, so as to further improve the product quality of the battery.

[0032] It should be noted that the shell 100 is further described in combination with the above-mentioned embodiments; for example, the shell 100 can be an aluminum shell 100, which is beneficial to improve the overall strength of the battery and control the overall weight of the battery; at the same time, in order to further improve the insulation effect between the electrode assembly 200 and the shell 100, the inner side wall of the shell 100 can be coated with an insulating layer (for example, formed by coating process), which further improves the insulation effect between the shell 100 and the electrode assembly 200, and prevents the electrolyte from corroding the shell 100, so as to ensure the product quality of the battery.

[0033] In some embodiments, a plurality of first permeable holes 311 and a plurality of second permeable holes 401 are provided, and the number of the first permeable holes 311 is less than the number of the second permeable holes 401.

[0034] As for the first permeable hole 311 and the second permeable hole 401, the first permeable hole 311 and the second permeable hole 401 are arranged on the bottom insulating layer 310 and the bottom support plate 400 respectively, and the orthographic projection of the first permeable hole 311 on the bottom support plate 400 does not coincide with the second permeable hole 401, so that the gap between the first permeable hole 311, the bottom insulating layer 310 and the bottom support plate 400, and the second permeable hole 401 are communicated and form an electrolyte passage, and the electrolyte penetrates into the bottom of the electrode assembly 200 through the electrolyte passage and fully soaks it; for example, Figures 1-4As shown, the first penetration hole 311 and the second penetration hole 401 can be provided with multiple, that is, the bottom insulation layer 310 is provided with multiple first penetration holes 311, and the bottom support plate 400 is provided with multiple second penetration holes 401, so that the bottom insulation layer 310 and the bottom support plate 400 have multiple electrolyte passages, which can ensure that the electrolyte can fully soak the electrode assembly 200, and is beneficial to improve the uniformity of the electrolyte soaking the electrode assembly 200.

[0035] In addition, as for the first penetration hole 311 and the second penetration hole 401, the number of the first penetration hole 311 of the bottom insulation layer 310 can be less than the number of the second penetration hole 401 opened in the bottom support plate 400, at this time, the electrolyte can be fully entered into the gap between the bottom support plate 400 and the bottom insulation layer 310, which is beneficial to provide sufficient electrolyte to the electrode assembly 200 through the first penetration hole 311.

[0036] It should be noted that the first penetration hole 311 and the second penetration hole 401 are further described in combination with the above embodiments; as for the first penetration hole 311, the first penetration hole 311 can be regularly distributed on the bottom insulation layer 310, or irregularly distributed, specifically as Figures 1-3 As shown, the electrolyte in the gap can penetrate to the bottom of the electrode assembly 200 through the first penetration hole 311, which improves the uniformity of the electrolyte soaking the electrode assembly 200; similarly, the first penetration hole 311 can be regularly distributed on the bottom insulation layer 310, specifically as Figure 1 、 Figure 2 and Figure 4 As shown, the electrolyte in the gap can penetrate to the bottom of the electrode assembly 200 through the first penetration hole 311, which improves the uniformity of the electrolyte soaking the electrode assembly 200; similarly, the first penetration hole 311 can be regularly distributed on the bottom insulation layer 310, specifically as

[0037] In some embodiments, at least one second penetration hole 401 is provided between the orthographic projections of two adjacent first penetration holes 311 on the bottom support plate 400.

[0038] As for the first penetration hole 311, the electrolyte in the gap between the bottom support plate 400 and the bottom insulation layer 310 can penetrate to the bottom of the electrode assembly 200 through the first penetration hole 311 to soak the pole piece in the electrode assembly 200; as Figure 1 and Figure 2As shown, for two adjacent first penetration holes 311, by arranging at least one second penetration hole 401 between the orthographic projections of the two adjacent first penetration holes 311 on the bottom support plate 400, when the electrolyte penetrates into the gap between the bottom support plate 400 and the bottom insulation layer 310 through the second penetration hole 401, sufficient electrolyte can be provided to the first penetration hole 311 adjacent to the second penetration hole 401, so that the electrolyte in the gap can penetrate into the bottom of the electrode assembly 200 through the first penetration hole 311, which is beneficial to improve the uniformity of the electrolyte infiltration of the electrode assembly 200, thereby improving the infiltration effect.

[0039] It should be noted that the first penetration hole 311 is further described in combination with the above-mentioned embodiments; for example, Figures 1-3 As shown, the number of first penetration holes 311 is less than the number of second penetration holes 401, and at least one first penetration hole 311 is arranged between the orthographic projections of two adjacent first penetration holes 311 on the bottom support plate 400, so that for any first penetration hole 311, a plurality of second penetration holes 401 can be distributed around the first penetration hole 311, and the plurality of corresponding distributed second penetration holes 401 can provide electrolyte to the first penetration hole 311 to ensure the sufficiency of the electrolyte in the first penetration hole 311, which will not be described here.

[0040] In some embodiments, the orthographic projection area of any first penetration hole 311 on the bottom support plate 400 is greater than the area of a second penetration hole 401.

[0041] For the battery cell, the first penetration hole 311 and the second penetration hole 401 are connected through the gap between the bottom insulation layer 310 and the bottom support plate 400 and constitute an electrolyte passage, which can improve the infiltration effect of the electrolyte on the bottom of the electrode assembly 200; for example, Figures 1-3 As shown, since the first penetration hole 311 is arranged in a plurality, and the number of first penetration holes 311 is less than the number of second penetration holes 401, at this time, by making the orthographic projection area of each first penetration hole 311 on the bottom support plate 400 greater than the area of a second penetration hole 401, the electrolyte in the second penetration hole 401 that penetrates into the gap can continuously provide electrolyte to the bottom of the electrode assembly 200 through the first penetration hole 311, which is beneficial to fully infiltrate the electrode assembly 200.

[0042] In some embodiments, the sum of the orthographic projection areas of the plurality of first penetration holes 311 on the bottom support plate 400 and the areas of the plurality of second penetration holes 401 is less than the area of the bottom insulation layer 310.

[0043] The electrolyte can enter the bottom of the electrode assembly 200 through the second penetration hole 401, the gap between the bottom supporting plate 400 and the bottom insulating layer 310, and the first penetration hole 311, so that the electrolyte fully wets the electrode sheet in the electrode assembly 200. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, the bottom insulating layer 310 can be adapted to the shape of the bottom supporting plate 400, so as to improve the tightness and compactness of the insulating film 300 wrapping the electrode assembly 200, and prevent the bottom supporting plate 400 and the insulating film 300 from affecting the assembly of the electrode assembly 200 after assembly. In addition, the first penetration hole 311 is not overlapped with the second penetration hole 401 in the orthographic projection of the bottom supporting plate 400. Therefore, by making the area of the orthographic projection of the plurality of first penetration holes 311 on the bottom supporting plate 400 and the sum of the areas of the plurality of second penetration holes 401 on the bottom supporting plate 400 less than the area of the bottom insulating layer 310, the first penetration hole 311 and the second penetration hole 401 can form a complete electrolyte passage, which is conducive to regulating the density of the first penetration hole 311 and the second penetration hole 401 on the bottom insulating layer 310 and the bottom supporting plate 400.

[0044] In some embodiments, the distance between the orthographic projection of any first penetration hole 311 on the bottom supporting plate 400 and the adjacent second penetration hole 401 is less than the diameter of the second penetration hole 401.

[0045] For the battery cell, the orthographic projection of the first penetration hole 311 of the bottom insulating layer 310 on the bottom supporting plate 400 is not overlapped with the second penetration hole 401. The electrolyte can penetrate into the electrode assembly 200 through the second penetration hole 401, the gap between the bottom supporting plate 400 and the bottom insulating layer 310, and the first penetration hole 311 to form an electrolyte passage, and can also block foreign matter to avoid short circuit between the electrode assembly 200 and the shell 100. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, for any first penetration hole 311, the distance between the orthographic projection of the first penetration hole 311 on the bottom supporting plate 400 and the adjacent second penetration hole 401 can be less than the diameter of the second penetration hole 401, which can improve the opening density of the second penetration hole 401 on the bottom supporting plate 400, enhance the wetting effect on the electrode assembly 200, and will not affect the blocking effect on the electrode assembly 200 and the bottom supporting plate 400, and improve the utilization efficiency of the surface of the bottom supporting plate 400 and the bottom insulating layer 310.

[0046] In some embodiments, the shape of the first penetration hole 311 and the second penetration hole 401 is one of a circle, a semicircle, an ellipse, and a polygon.

[0047] The second penetrating hole 401 of the bottom supporting plate 400, the gap between the bottom supporting plate 400 and the bottom insulating layer 310, and the first penetrating hole 311 of the bottom insulating layer 310 can form an electrolyte channel, so that the electrolyte can infiltrate the electrode assembly 200 through the electrolyte channel; wherein, based on the actual manufacturing process of the battery and the customer demand, the shape of the first penetrating hole 311 and the second penetrating hole 401 can be set as one of a circle, a semicircle, an ellipse, and a polygon; for example, as shown in Figures 2-4 the first penetrating hole 311 of the bottom insulating layer 310 and / or the second penetrating hole 401 of the bottom supporting plate 400, at least one of the first penetrating hole 311 and the second penetrating hole 401 can be set as a circle, which is beneficial to reduce the difficulty of opening the first penetrating hole 311 and the second penetrating hole 401, and facilitate the control of the production cost of the battery.

[0048] In some embodiments, the insulating film 300 further includes side insulating layers 320, and the two side insulating layers 320 are symmetrically arranged along the extension direction of the center line 312 of the bottom insulating layer 310.

[0049] For the battery cell, when the electrode assembly 200 is assembled into the shell 100, in order to avoid the surface of the electrode assembly 200 being scratched by the shell 100, and prevent the short circuit between the electrode assembly 200 and the shell 100 from causing damage to the battery; as shown in Figures 1-3 the insulating film 300 and the bottom supporting plate 400 can be arranged outside the electrode assembly 200 to protect it; specifically, in addition to the bottom insulating layer 310, the insulating film 300 further includes side insulating layers 320 for protecting the side of the electrode assembly 200, wherein the two side insulating layers 320 are symmetrically arranged along the extension direction of the center line 312 of the bottom insulating layer 310 to cover and protect the two relatively large sides of the electrode assembly 200; for example, when the electrode assembly 200 is wrapped with the insulating film 300, the side insulating layers 320 can be folded towards the direction close to the electrode assembly 200, so that the side insulating layers 320 and the bottom insulating layer 310 are arranged at an angle (for example, the angle between them is 90°), at this time, the bottom insulating layer 310 and the side insulating layers 320 can form a shell structure with an opening, which can protect the bottom and the side of the electrode assembly 200, and also realize the electrical insulation of the electrode assembly 200.

[0050] It should be noted that the side insulation layer 320 and the bottom insulation layer 310 in the electrode assembly 200 are further described in combination with the above embodiment; the side insulation layer 320 and the bottom insulation layer 310 can be prepared by an integral molding process; in order to improve the wrapping effect of the insulation film 300 on the electrode assembly 200, a crease area (not marked in the figure) can be arranged in the connecting area between the side insulation layer 320 and the bottom insulation layer 310, which reduces the wrapping difficulty of the electrode assembly 200 and improves the neatness and aesthetics of the side insulation layer 320 after bending, which is beneficial to fully wrap the side of the electrode assembly 200 and prevent the electrode assembly 200 from bulging.

[0051] In some embodiments, any side insulation layer 320 is also provided with two adhesive parts 321, and the two adhesive parts 321 are symmetrically arranged along the extension direction perpendicular to the center line 312 of the bottom insulation layer 310.

[0052] As for the side insulation layer 320, the side insulation layer 320 and the bottom insulation layer 310 are connected to each other and used to protect the side of the electrode assembly 200, prevent the electrode assembly 200 from being scratched by the shell 100 during assembly, and avoid short circuit between the electrode assembly 200 and the shell 100 to affect the quality of the battery; as shown in Figure 2 and Figure 3 When the electrode assembly 200 is wrapped with the insulation film 300, as for any side insulation layer 320, the opposite sides of the side insulation layer 320 can also be respectively provided with two adhesive parts 321, and the two adhesive parts 321 are symmetrically arranged along the extension direction perpendicular to the center line 312 of the bottom insulation layer 310; that is, the two side insulation layers 320 can be connected and assembled through the corresponding adhesive parts 321, so as to realize the overall protection of the side of the electrode assembly 200.

[0053] It should be noted that the adhesive part 321 is further described in combination with the above embodiment; the side insulation layer 320 and the adhesive part 321 can be prepared by an integral molding process; in order to improve the wrapping effect of the two on the electrode assembly 200, a folding area (not marked in the figure) can be arranged in the connecting area between the side insulation layer 320 and the adhesive part 321, which reduces the connection difficulty between the two side insulation layers 320; in addition, the adhesive parts 321 can be connected by adhesive tape or by coating glue, which will not be described here.

[0054] In some embodiments, the bottom support plate 400 and the bottom insulation layer 310 are both provided with positioning holes 500, and the positioning hole 500 of the bottom insulation layer 310 is in the orthographic projection of the bottom support plate 400 and coincides with the positioning hole 500 of the bottom support plate 400.

[0055] As for the battery cell, the bottom supporting plate 400 is stacked between the bottom insulation layer 310, and the bottom insulation layer 310 is in the same projection as the bottom supporting plate 400, ensuring that the first penetration hole 311 is not in the same projection as the second penetration hole 401. Figures 1-4 As shown in FIG. 14, positioning holes 500 can be formed in the bottom supporting plate 400 and the bottom insulation layer 310, respectively. When the bottom supporting plate 400 and the insulation film 300 are assembled, the positioning holes 500 of the bottom insulation layer 310 are in the same projection as the positioning holes 500 of the bottom supporting plate 400, improving the positioning accuracy between the bottom supporting plate 400 and the bottom insulation layer 310, so that they are completely coincident, preventing the first penetration hole 311 from overlapping the second penetration hole 401. The positioning holes 500 of the bottom supporting plate 400 and the positioning holes 500 of the bottom insulation layer 310 can be connected by heat fusion, and when the bottom supporting plate 400 and the bottom insulation layer 310 are connected by the positioning holes 500, the second penetration hole 401 is not in the same projection as the first penetration hole 311, so that the shell 100 and the electrode assembly 200 have good isolation and insulation effects.

[0056] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve the desired results. In some implementations, multitasking and parallel processing can be advantageous.

[0057] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0058] The description of the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

[0059] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and not intended to limit the scope of the application (including the claims) in any way. Such embodiments and / or steps of such embodiments can be selected and combined by those skilled in the art to implement the application in its various aspects, and such steps can be implemented in any order, and are not limited to the order shown in the figures or described above. Many other variations in the above-described embodiments and / or steps of such embodiments are possible, and departures from such embodiments can be made without departing from the scope of the application.

[0060] Although the application has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0061] It is therefore intended to embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any and all departures from the above-described embodiments are included within the scope of the present application.

Claims

1. An electric cell, characterized by, The application relates to a battery, which comprises the following parts: a shell; an electrode assembly arranged in the shell; an insulation film wrapping the electrode assembly to insulate the shell from the electrode assembly; the insulation film comprises a bottom insulation layer arranged between the bottom of the electrode assembly and the bottom of the shell, a bottom supporting plate arranged between the bottom insulation layer and the bottom of the shell; the bottom insulation layer is in coincidence with the bottom supporting plate in the orthographic projection of the bottom supporting plate, and there is a gap between the bottom insulation layer and the bottom supporting plate; the bottom insulation layer is provided with first penetrating holes, and the bottom supporting plate is provided with second penetrating holes; the first penetrating holes are not in coincidence with the second penetrating holes in the orthographic projection of the bottom supporting plate.

2. The electric cell of claim 1, wherein, The first penetrating holes and the second penetrating holes are both provided with a plurality of penetrating holes, and the number of the first penetrating holes is less than that of the second penetrating holes.

3. The electric cell of claim 2, wherein, At least one second penetrating hole is arranged between the orthographic projections of two adjacent first penetrating holes.

4. The electric cell of claim 2, wherein, The area of the orthographic projection of any first penetrating hole on the bottom supporting plate is greater than that of a second penetrating hole.

5. The electric cell of claim 4, wherein, The area of the orthographic projection of a plurality of first penetrating holes on the bottom supporting plate is less than the sum of the areas of a plurality of second penetrating holes.

6. The electric cell of claim 2, wherein, The distance between the orthographic projection of any first penetrating hole on the bottom supporting plate and the adjacent second penetrating hole is less than the diameter of the second penetrating hole.

7. The electric cell of claim 1, wherein, The shapes of the first penetrating holes and the second penetrating holes are one of a circle, a semicircle, an ellipse and a polygon.

8. The electric cell of claim 1, wherein, The insulation film further comprises: side insulation layers; the side insulation layers are arranged symmetrically along the extension direction of the center line of the bottom insulation layer.

9. The electric cell of claim 8, wherein, Any side insulation layer is further provided with two adhesive parts, and the two adhesive parts are arranged symmetrically along the extension direction of the center line of the bottom insulation layer.

10. The battery cell according to claim 1, characterized in that The bottom supporting plate and the bottom insulation layer are both provided with positioning holes, and the positioning holes of the bottom insulation layer are in coincidence with the positioning holes of the bottom supporting plate in the orthographic projection of the bottom supporting plate.

Images