Roll core coating structure and battery

Abstract

The utility model relates to a roll core coating structure and a battery. A roll core in the roll core coating structure is provided with a bottom surface film pasting area and a side surface film pasting area; the first protective film is arranged on the bottom surface film pasting area in an attached mode, the first protective film is provided with a first edge folding part, and the first edge folding part is arranged on the folding side face of the roll core in an attached mode; the second protective film is attached to the side face film attaching area and provided with a second edge folding part, and the second edge folding part is attached to the folding side face of the roll core; the second folding part and the first folding part are at least partially overlapped, so that the bottom surface film pasting area and the side surface film pasting area of the roll core are coated, and the risk of short circuit of the inner roll core caused by powder falling of the roll core and contact between the roll core and the shell is reduced; the second folding edge part and the first folding edge part are folded and attached to the folding side face of the roll core, and the first folding edge part and the second folding edge part are at least partially overlapped, so that the risk that the first protective film or the second protective film is in contact and bonded with the shell to cause falling off is avoided, and the safety of the roll core is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a winding core coating structure and a battery. BACKGROUND

[0002] In the production process of a lithium battery, due to the existence of a gap after the inner protective film and the bottom support of the winding core are hot melted, the winding core cannot be avoided to be knocked and the powder is dropped in the transfer process. If the winding core is assembled in the shell after the powder is dropped and is not recognized and detected, if the gap of the outer protective film of the winding core is too large, the dropped powder is easy to contact the shell and cause internal corrosion and short circuit.

[0003] In the existing protective film coating mode of the winding core, the protective film is easy to stick to the inner wall of the shell and cause falling off, and there is still a gap at the bottom of the side of the winding core, which has the safety risk of the dropped powder contacting the shell. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the application provides a winding core coating structure and a battery.

[0005] In a first aspect, the application provides a winding core coating structure, comprising:

[0006] a winding core, the winding core being provided with a bottom surface film pasting area and a side surface film pasting area;

[0007] a first protective film, the first protective film being attached to the bottom surface film pasting area, the first protective film being provided with a first folded edge portion, the first folded edge portion being attached to the folded side surface of the winding core;

[0008] a second protective film, the second protective film being attached to the side surface film pasting area, the second protective film being provided with a second folded edge portion, the second folded edge portion being attached to the folded side surface of the winding core; and the second folded edge portion and the first folded edge portion being at least partially overlapped.

[0009] In one of the embodiments, the side surface film pasting area comprises a first side surface film pasting sub-area and a second side surface film pasting sub-area, and the winding core has adjacent bottom surface, first film pasting side surface and second film pasting side surface;

[0010] the bottom surface film pasting area is arranged on the bottom surface of the winding core, the first side surface film pasting sub-area is arranged on the first film pasting side surface of the winding core, and the second side surface film pasting sub-area is arranged on the second film pasting side surface of the winding core; the bottom surface film pasting area is adjacent to the first side surface film pasting sub-area, and the bottom surface film pasting area is adjacent to the second side surface film pasting sub-area.

[0011] In one of the embodiments, the area of the bottom surface film pasting area is equal to the area of the bottom surface of the winding core;

[0012] the area of the first side surface film pasting sub-area is less than or equal to the area of the first film pasting side surface of the winding core; and the area of the second side surface film pasting sub-area is less than or equal to the area of the second film pasting side surface of the winding core.

[0013] In one of the embodiments, the width of the first side film pasting sub-area ranges from 10 to 20 mm, and the width of the second side film pasting sub-area ranges from 10 to 20 mm.

[0014] In one of the embodiments, the bottom film pasting area includes a first bottom film pasting sub-area and a second bottom film pasting sub-area.

[0015] The first bottom film pasting sub-area and the second bottom film pasting sub-area are arranged on the bottom surface of the winding core; the first bottom film pasting sub-area is adjacent to the first side film pasting sub-area, and the second bottom film pasting sub-area is adjacent to the second side film pasting sub-area.

[0016] In one of the embodiments, the sum of the area of the first bottom film pasting sub-area and the area of the second bottom film pasting sub-area is less than the area of the bottom surface of the winding core.

[0017] The area of the first side film pasting sub-area is less than the area of the first film pasting side of the winding core; and the area of the second side film pasting sub-area is less than the area of the second film pasting side of the winding core.

[0018] In one of the embodiments, the area of the first folding edge part is less than the area of the folding side of the winding core.

[0019] The area of the second folding edge part is less than the area of the folding side of the winding core.

[0020] In one of the embodiments, the width of the first folding edge part ranges from 10 to 20 mm.

[0021] The width of the second folding edge part ranges from 10 to 20 mm.

[0022] In one of the embodiments, the width of the second folding edge part ranges from two-thirds to three-quarters of the width of the folding side of the winding core.

[0023] In one of the embodiments, the thickness of the first protective film ranges from 0.08 to 0.12 mm.

[0024] The thickness of the second protective film ranges from 0.08 to 0.12 mm.

[0025] In a second aspect, the application provides a battery including a shell and the winding core covering structure according to any one of the above embodiments; the winding core covering structure is arranged in the shell.

[0026] One of the above technical solutions has the following advantages and beneficial effects:

[0027] The winding core covering structure includes a winding core, a first protective film and a second protective film. The winding core is provided with a bottom film pasting area and a side film pasting area. The first protective film is attached to the bottom film pasting area. The first protective film is provided with a first folded edge part, which is attached to the folded side of the winding core. The second protective film is attached to the side film pasting area. The second protective film is provided with a second folded edge part, which is attached to the folded side of the winding core. The second folded edge part at least partially overlaps the first folded edge part, thereby covering the bottom film pasting area and the side film pasting area of the winding core. The second protective film is attached to the corresponding position of the side of the winding core, and the first protective film is attached to the corresponding position of the bottom of the winding core, thereby reducing the risk of short circuit of the inner winding core caused by the contact between the winding core and the shell. The second folded edge part of the second protective film is folded and attached to the folded side of the winding core, and the first folded edge part of the first protective film is folded and attached to the folded side of the winding core and at least partially overlaps the second folded edge part, thereby avoiding the risk of falling caused by the contact and bonding between the first protective film or the second protective film and the shell, and improving the safety of the winding core. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a front side view of the first structure of the winding core in the embodiment of the present application.

[0029] Figure 2 It is a left side view (or right side view) of the first structure of the winding core in the embodiment of the present application.

[0030] Figure 3 It is a bottom view of the first structure of the winding core in the embodiment of the present application.

[0031] Figure 4 It is a front side view of the first structure of the winding core covering structure in the embodiment of the present application.

[0032] Figure 5 It is a left side view (or right side view) of the first structure of the winding core covering structure in the embodiment of the present application.

[0033] Figure 6 It is a bottom view of the first structure of the winding core covering structure in the embodiment of the present application.

[0034] Figure 7 It is a front side view of the second structure of the winding core covering structure in the embodiment of the present application.

[0035] Figure 8 It is a left side view (or right side view) of the second structure of the winding core covering structure in the embodiment of the present application.

[0036] Figure 9 It is a bottom view of the second structure of the winding core covering structure in the embodiment of the present application.

[0037] Figure 10 This is a schematic diagram of the front side of the third structure of the core covering structure in the embodiments of this application;

[0038] Figure 11 This is a schematic diagram of the left (or right) side of the third structure of the core covering structure in the embodiments of this application;

[0039] Figure 12 This is a schematic diagram of the bottom surface of the third structure of the core covering structure in the embodiments of this application.

[0040] Figure label:

[0041] 10. Roll core; 110. Bottom film application area; 112. First bottom film application sub-area; 114. Second bottom film application sub-area; 120. Side film application area; 122. First side film application sub-area; 124. Second side film application area; 130. Folded side; 20. First protective film; 210. First folded edge; 30. Second protective film; 310. Second folded edge. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover inclusions not explicitly listed. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0045] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0046] In addition, the term "multiple" should mean two or more.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] In one embodiment, such as Figures 1 to 6 As shown, a core covering structure is provided, including a core 10, a first protective film 20, and a second protective film 30. The core 10 is provided with a bottom film application area 110 and a side film application area 120. The first protective film 20 is adhered to the bottom film application area 110 and has a first folded edge portion 210, which is adhered to the folded side surface 130 of the core 10. The second protective film 30 is adhered to the side film application area 120 and has a second folded edge portion 310, which is adhered to the folded side surface 130 of the core 10. The second folded edge portion 310 at least partially overlaps with the first folded edge portion 210.

[0049] The core 10 covering structure of this application can be applied in lithium-ion batteries. The lithium-ion battery can be square in shape and includes a casing with an opening. The core 10 covering structure can be embedded in the casing through the opening. The lithium-ion battery also includes a cover plate that covers the opening of the casing to seal the core 10 covering structure.

[0050] The core 10 can have a square structure, such as a cuboid structure. The core 10 has a bottom surface, a left side surface, a right side surface, a front side surface, and a rear side surface. The front and rear side surfaces can be larger, while the left and right side surfaces can be smaller. A bottom film application area 110 is disposed on the bottom surface of the core 10. For example, the bottom film application area 110 can be a partial area of ​​the bottom surface of the core 10; in another example, the bottom film application area 110 can be the entire bottom surface of the core 10. It should be noted that the size of the bottom film application area 110 can be set according to the model of the core 10 and the application scenario.

[0051] The side film application area 120 can be the front and rear sides, or it can be the left and rear sides. For example, when the side film application area 120 is the front and rear sides, the folded side 130 of the core 10 can be the left and right sides of the core 10; similarly, when the side film application area 120 is the left and right sides, the folded side 130 of the core 10 can be the front and rear sides of the core 10. The side film application area 120 can be a partial area of ​​the corresponding side of the core 10; in another example, the side film application area 120 can also be the entire area of ​​the corresponding side of the core 10. It should be noted that the size of the side film application area 120 can be set according to the model of the core 10 and the application scenario.

[0052] The first protective film 20 can be adhesive tape or adhesive paper, and can be a PE (polyethylene) film or a PET (polyethylene terephthalate) film. For example, one side of the first protective film 20 may be provided with adhesive. By attaching the adhesive-side of the first protective film 20 to the bottom film-applying area 110, the first protective film 20 is securely installed in the bottom film-applying area 110 of the core 10. The second protective film 30 can be adhesive tape or adhesive paper, and can be a PE (polyethylene) film or a PET (polyethylene terephthalate) film. For example, one side of the second protective film 30 may be provided with adhesive. By attaching the adhesive-side of the second protective film 30 to the side film-applying area 120, the second protective film 30 is securely installed in the side film-applying area 120 of the core 10.

[0053] The first folded edge portion 210 of the first protective film 20 is folded and adhered to the folded side surface 130 of the core 10, and the second folded edge portion 310 of the second protective film 30 is folded and adhered to the folded side surface 130 of the core 10. For example, the first protective film 20 can be divided into a first main body portion and a first folded edge portion 210; the second protective film 30 can be divided into a second main body portion and a second folded edge portion 310. Specifically, the core 10 wrapping process can be as follows: First, the second main body portion of the second protective film 30 is adhered to the side film application area 120 of the core 10, and then the second folded edge portion 310 of the second protective film 30 is folded and adhered to the folded side surface 130 of the core 10, thereby achieving the installation of the second protective film 30; second, the first main body portion of the first protective film 20 is adhered to the bottom film application area 110 of the core 10, and then the first folded edge portion 210 of the first protective film 20 is folded and adhered to the folded side surface 130 of the core 10. Furthermore, the first folded edge 210 overlaps at least partially with the second folded edge 310, thereby enabling the installation of the first protective film 20. This strengthens the adhesion of the second folded edge 310, preventing the second folded edge 310 from separating from the folded side 130 of the core 10 during transport or assembly. It also prevents the protective film (first protective film 20 and second protective film 30) from contacting and adhering to the shell, thus reducing the probability of the core 10 shedding powder and coming into contact with the shell, and improving the safety of the core 10.

[0054] In the above embodiments, the core 10 is provided with a bottom film-applying area 110 and a side film-applying area 120; a first protective film 20 is applied to the bottom film-applying area 110, and the first protective film 20 is provided with a first folded edge portion 210, which is applied to the folded side surface 130 of the core 10; a second protective film 30 is applied to the side film-applying area 120, and the second protective film 30 is provided with a second folded edge portion 310, which is applied to the folded side surface 130 of the core 10; the second folded edge portion 310 and the first folded edge portion 210 are at least partially overlapped, thereby covering the bottom film-applying area 110 and the side film-applying area 120 of the core 10. This application reduces the risk of short circuit in the inner core 10 due to powder shedding from the core 10 coming into contact with the shell by attaching a second protective film 30 to a corresponding position on the side of the core 10 and a first protective film 20 to a corresponding position on the bottom of the core 10. The second protective film 30 is folded and attached to the folded side 130 of the core 10 by the second folded edge 310, and the first protective film 20 is folded and attached to the folded side 130 of the core 10 by the first folded edge 210, which at least partially overlaps with the second folded edge 310. This avoids the risk of the first protective film 20 or the second protective film 30 coming into contact with the shell and sticking, thus improving the safety of the core 10.

[0055] In one embodiment, such as Figure 2 ,Figures 7 to 9 As shown, the side film application area 120 includes a first side film application sub-area 122 and a second side film application sub-area 124. The core 10 has an adjacent bottom surface, a first film application side surface, and a second film application side surface. The bottom film application area 110 is disposed on the bottom surface of the core 10. The first side film application sub-area 122 is disposed on the first film application side surface of the core 10, and the second side film application sub-area 124 is disposed on the second film application side surface of the core 10. The bottom film application area 110 is adjacent to the first side film application sub-area 122, and the bottom film application area 110 is adjacent to the second side film application area 124.

[0056] For example, such as Figures 7 to 9 As shown, the first film-applied side of the core 10 can be the front side of the core 10 (the side with the largest area of ​​the core 10), and the second film-applied side of the core 10 can be the rear side of the core 10 (the side with the largest area of ​​the core 10). The bottom film-applied area 110 completely covers the bottom surface of the core 10; the first side film-applied sub-area 122 can be a partial area of ​​the first film-applied side, such as the first side film-applied sub-area 122 being located at the first end of the first film-applied side, and the first side film-applied sub-area 122 being adjacent to the bottom film-applied area 110; the second side film-applied sub-area 124 can be a partial area of ​​the second film-applied side, the second side film-applied sub-area 124 being located at the first end of the second film-applied side, and the second side film-applied sub-area 124 being adjacent to the bottom film-applied area 110.

[0057] The second main body of the second protective film 30 is attached to the first side film application area 122 of the core 10, and the second folded edge 310 of the second protective film 30 is folded and attached to two adjacent folded sides 130; the second main body of another second protective film 30 is attached to the second side film application area 124 of the core 10, and the corresponding second folded edge 310 of the second protective film 30 is folded and attached to two adjacent folded sides 130, thereby realizing the installation of the second protective film 30; the first main body of the first protective film 20 is attached to the bottom film application area 110 of the core 10, and the first folded edge 210 of the first protective film 20 is folded and attached to two adjacent folded sides 130. The first protective film 20 is installed by folding and bonding the first folded edge 210 with at least a partial overlap with the second folded edge 310. This strengthens the bonding strength of the second folded edge 310, preventing the second folded edge 310 from separating from the folded side 130 of the core 10 during transportation or assembly. It also avoids the risk of the protective film (first protective film 20 and second protective film 30) coming into contact with the shell and falling off. Furthermore, it reduces the probability of the core 10 shedding powder and coming into contact with the shell, improving the safety of the core 10. In addition, it reduces the amount of protective film (first protective film 20 and second protective film 30) used, avoiding waste and reducing costs.

[0058] For example, such as Figures 10 to 12As shown, the first side film application area 122 completely covers the first film application side and is adjacent to the bottom film application area 110. The second protective film 30 is applied to the first side film application area 122, and the second folded edge 310 of the second protective film 30 is completely applied to the folded side 130. The second side film application area 124 completely covers the second film application side and is adjacent to the bottom film application area 110. Correspondingly, the second protective film 30 is applied to the second side film application area 124, and the second folded edge 310 of the second protective film 30 is completely applied to the folded side. The bottom film area 110 completely covers the bottom surface of the core 10. The first protective film 20 is attached to the bottom film area 110, and the first folded edge 210 of the first protective film 20 is completely attached to the corresponding folded side 130, thereby achieving full coverage of the core 10. The inner protective film and bottom support of the core 10 are eliminated. The increase in the thickness of the protective film has a small impact, reducing costs. It also avoids the risk of the protective film (first protective film 20 and second protective film 30) coming into contact with the shell and falling off, reducing the probability of the core 10 shedding powder and coming into contact with the shell, and greatly improving the safety of the core 10.

[0059] In one embodiment, such as Figures 7 to 9 As shown, the area of ​​the bottom film application area 110 is equal to the area of ​​the bottom surface of the core 10; the area of ​​the first side film application area 122 is smaller than the area of ​​the first film application side of the core 10; and the area of ​​the second side film application area 124 is smaller than the area of ​​the second film application side of the core 10.

[0060] The bottom film application area 110 may be rectangular, and the first main body of the corresponding first protective film 20 completely covers the bottom film application area 110. For example, the width of the bottom film application area 110 is the same as the width of the bottom surface of the core 10, and the length of the bottom film application area 110 is equal to the length of the bottom surface of the core 10, thereby enabling the bottom surface of the core 10 to be covered with a protective film.

[0061] The first side film application area 122 may be rectangular, and the first main body of the corresponding second protective film 30 completely covers the first side film application area 122. For example, the width of the first side film application area 122 is equal to the width of the corresponding side of the core 10, and the length of the first side film application area 122 is less than half the length of the corresponding side of the core 10. For example, the width of the first side film application area 122 ranges from 10 to 20 mm; preferably, the width of the first side film application area 122 is 15 mm. The second side film application area 124 may be rectangular, and the first main body of the corresponding second protective film 30 completely covers the second side film application area 124. For example, the width of the second side film application area 124 is equal to the width of the corresponding side of the core 10, and the length of the second side film application area 124 is less than half the length of the corresponding side of the core 10. For example, the width of the second side film application area 124 is in the range of 10 to 20 mm. Preferably, the width of the second side film application area 124 is 15 mm, which can reduce the amount of second protective film 30 used, avoid waste of protective film, and reduce costs.

[0062] The folded side 130 of the core 10 can be a side with a smaller area. A corresponding second protective film 30 is attached to the first side film application area 122 and the second side film application area 124 of the core 10, and the second folded edge 310 of the corresponding second protective film 30 is folded and attached to the adjacent folded side 130, thereby achieving the installation of the second protective film 30. A corresponding first protective film 20 is attached to the bottom film application area 110 of the core 10, and the first folded edge 210 of the corresponding first protective film 20 is folded and attached to the adjacent folded side 130. The first folded edge 210 at least partially attaches to the... The first protective film 20 is installed on the second folded edge 310, thereby forming a U-shaped protective film near the bottom of the core 10. This prevents the second folded edge 310 from separating from the folded side 130 of the core 10 during transportation or assembly, and avoids the risk of the protective film (first protective film 20 and second protective film 30) coming into contact with and adhering to the shell, thus reducing the probability of the core 10 shedding powder and coming into contact with the shell, improving the safety of the core 10. In addition, it reduces the amount of protective film (first protective film 20 and second protective film 30) used, avoiding waste and reducing costs.

[0063] It should be noted that the increased thickness of the protective film on the folded side 130 has a relatively small impact. This core 10 covering structure is suitable for batteries with a small area of ​​core 10 on the side and a certain space between the core and the casing.

[0064] In one embodiment, such as Figures 10 to 12As shown, the area of ​​the bottom film application area 110 is equal to the area of ​​the bottom surface of the core 10; the area of ​​the first side film application area 122 is equal to the area of ​​the first film application side of the core 10; and the area of ​​the second side film application area 124 is equal to the area of ​​the second film application side of the core 10.

[0065] The first main body of the corresponding second protective film 30 completely covers the first side film application area 122. For example, the width of the first side film application area 122 is equal to the width of the corresponding side of the core 10, and the length of the first side film application area 122 is equal to the length of the corresponding side of the core 10. The first main body of the corresponding second protective film 30 completely covers the second side film application area 124. For example, the width of the second side film application area 124 is equal to the width of the corresponding side of the core 10, and the length of the second side film application area 124 is equal to the length of the corresponding side of the core 10.

[0066] For example, the folded side 130 of the core 10 can be a side with a smaller area. A corresponding second protective film 30 is attached to the corresponding side of the core 10, and the second folded edge 310 of the second protective film 30 is folded and attached to the adjacent folded side 130, thereby realizing the installation of the second protective film 30. A corresponding first protective film 20 is attached to the bottom surface of the core 10, and the first folded edge 210 of the first protective film 20 is folded and attached to the adjacent folded side 130. The first folded edge 210 is at least partially attached to the second folded edge 310, thereby realizing the installation of the first protective film 20. This allows the core 10 to be fully covered by protective film, avoiding the risk of the protective film (first protective film 20 and second protective film 30) coming into contact with the shell and falling off. This greatly reduces the probability of the core 10 shedding powder and coming into contact with the shell, improving the safety of the core 10. In addition, the inner protective film and bottom support of the core 10 can be eliminated, reducing costs.

[0067] It should be noted that the increased thickness of the protective film on the folded side 130 has a relatively small impact. This core 10 covering structure is suitable for batteries with a small area of ​​core 10 on the side and a certain space between the core and the casing.

[0068] In one embodiment, the width of the second folded edge 310 is between two-thirds and three-quarters of the width of the folded side 130 of the core 10.

[0069] The second folded edge portion 310 of each second protective film 30 is folded and bonded to the adjacent folded side surface 130, so that the second folded edge portion 310 of the corresponding folded side surface 130 is at least partially overlapped; the first folded edge portion 210 of the first protective film 20 is folded and bonded to the adjacent 2 folded side surfaces 130, so that the first folded edge portion 210 is at least partially bonded to the corresponding second folded edge portion 310, so that multiple layers of protective films are formed on the folded side surface 130, which further strengthens the adhesion of the protective film, avoids the separation of the second folded edge portion 310 from the folded side surface 130 of the core 10 during transportation or assembly, and avoids the risk of the protective film (first protective film 20 and second protective film 30) coming into contact with the shell and falling off, and reduces the probability of the core 10 shedding powder and coming into contact with the shell, thus improving the safety of the core 10.

[0070] In one embodiment, such as Figures 1 to 3 As shown, the bottom film application area 110 includes a first bottom film application sub-area 112 and a second bottom film application sub-area 114; the first bottom film application area 112 and the second bottom film application area 114 are disposed on the bottom surface of the core 10; the first bottom film application area 112 is adjacent to the first side film application area 122, and the second bottom film application area 114 is adjacent to the second side film application area 124.

[0071] For example, the first film-applied side of the core 10 can be the left side of the core 10 (i.e., the side with a smaller area of ​​the core 10), and the second film-applied side of the core 10 can be the right side of the core 10 (i.e., the side with a smaller area of ​​the core 10). The first bottom film-applied sub-area 112 and the second bottom film-applied sub-area 114 can be arranged alternately. For example, the first bottom film-applied sub-area 112 can be located at the first end of the bottom surface of the core 10, and the second bottom film-applied sub-area 114 can be located at the second end of the bottom surface of the core 10. The first side film-applied sub-area 122 can be a partial area of ​​the first film-applied side, such as the first side film-applied sub-area 122 being located at the first end of the first film-applied side, and the first side film-applied sub-area 122 being adjacent to the first bottom film-applied sub-area 112; the second side film-applied sub-area 124 can be a partial area of ​​the second film-applied side, the second side film-applied sub-area 124 being located at the first end of the second film-applied side, and the second side film-applied sub-area 124 being adjacent to the second bottom film-applied sub-area 114.

[0072] The second main body portion of the second protective film 30 is attached to the first side film application area 122 of the core 10, and the second folded edge portion 310 of the second protective film 30 is folded and attached to two adjacent folded sides 130; the second main body portion of another second protective film 30 is attached to the second side film application area 124 of the core 10, and the corresponding second folded edge portion 310 of the second protective film 30 is folded and attached to two adjacent folded sides 130, thereby realizing the installation of the second protective film 30; the first main body portion of the first protective film 20 is attached to the first bottom film application area 112 of the core 10, and the first folded edge portion 210 of the first protective film 20 is folded and attached to two adjacent folded sides 130, and the first folded edge portion 210 at least partially overlaps with the second folded edge portion 310; the first main body portion of another first protective film 20 is attached to the first bottom film application area 112 of the core 10. The first protective film 20 is attached to the second bottom surface film application area 114 of the core 10. The first folded edge 210 of the corresponding first protective film 20 is folded and attached to the two adjacent folded sides 130. The first folded edge 210 overlaps at least partially with the corresponding second folded edge 310, thereby realizing the installation of the first protective film 20. This strengthens the adhesion of the second folded edge 310, prevents the second folded edge 310 from separating from the folded sides 130 of the core 10 during transportation or assembly, and avoids the risk of the protective film (first protective film 20 and second protective film 30) coming into contact with the shell and falling off. It also reduces the probability of the core 10 shedding powder and coming into contact with the shell, improving the safety of the core 10. In addition, it reduces the amount of protective film (first protective film 20 and second protective film 30) used, avoids waste of protective film, and reduces costs.

[0073] In one embodiment, such as Figures 1 to 3 As shown, the sum of the areas of the first bottom film application area 112 and the second bottom film application area 114 is less than the area of ​​the bottom surface of the core 10; the area of ​​the first side film application area 122 is less than the area of ​​the first film application side of the core 10; and the area of ​​the second side film application area 124 is less than the area of ​​the second film application side of the core 10.

[0074] The first bottom film application area 112 can be rectangular, with the first main body of the corresponding first protective film 20 completely covering the first bottom film application area 112. For example, the width of the first bottom film application area 112 is the same as the width of the bottom surface of the core 10, and the length of the first bottom film application area 112 is less than half the length of the bottom surface of the core 10; for example, the length of the first bottom film application area 112 can be between 25 and 30 millimeters. The second bottom film application area 114 can be rectangular, with the first main body of the corresponding first protective film 20 completely covering the second bottom film application area 114. For example, the width of the second bottom film application area 114 is the same as the width of the bottom surface of the core 10, and the length of the second bottom film application area 114 is less than half the length of the bottom surface of the core 10; for example, the length of the second bottom film application area 114 can be between 25 and 30 millimeters. This reduces the amount of first protective film 20 used, avoids waste, and lowers costs.

[0075] The first side film application area 122 can be rectangular, and the first main body of the corresponding second protective film 30 completely covers the first side film application area 122. For example, the width of the first side film application area 122 is equal to the width of the corresponding side of the core 10, and the length of the first side film application area 122 is less than half the length of the corresponding side of the core 10; for example, the length of the first side film application area 122 can be between 25 and 30 millimeters. The second side film application area 124 can be rectangular, and the first main body of the corresponding second protective film 30 completely covers the second side film application area 124. For example, the width of the second side film application area 124 is equal to the width of the corresponding side of the core 10, and the length of the second side film application area 124 is less than half the length of the corresponding side of the core 10; for example, the length of the second side film application area 124 can be between 25 and 30 millimeters. This reduces the amount of second protective film 30 used, avoids waste, and lowers costs.

[0076] In one embodiment, such as Figures 4 to 6 As shown, the area of ​​the first folded edge 210 is smaller than the area of ​​the folded side surface 130 of the core 10; the area of ​​the second folded edge 310 is smaller than the area of ​​the folded side surface 130 of the core 10.

[0077] For example, the width of the first folded edge 210 ranges from 10 to 20 millimeters; the width of the second folded edge 310 ranges from 10 to 20 millimeters. The width of the first folded edge 210 can be 15 millimeters; the width of the second folded edge 310 can be 15 millimeters.

[0078] For example, the folded side 130 of the core 10 can be a side with a larger area. A corresponding second protective film 30 is attached to the first side film application area 122 and the second side film application area 124 of the core 10, and the second folded edge 310 of the corresponding second protective film 30 is folded and attached to the two adjacent folded sides 130, thereby achieving the installation of the second protective film 30. Similarly, a corresponding first protective film 20 is attached to the first bottom film application area 112 and the second bottom film application area 114 of the core 10, and the first folded edge 210 of the corresponding first protective film 20 is folded and attached to the two adjacent folded sides 130. The first protective film 20 is installed on the second folded edge 310 at least partially, thereby forming two L-shaped protective films on the folded side 130 of the core 10. This prevents the second folded edge 310 from separating from the folded side 130 of the core 10 during transportation or assembly, and avoids the risk of the protective films (first protective film 20 and second protective film 30) coming into contact with and adhering to the shell, thus reducing the probability of the core 10 shedding powder and coming into contact with the shell, improving the safety of the core 10. In addition, it reduces the amount of protective film (first protective film 20 and second protective film 30) used, avoiding waste and reducing costs.

[0079] It should be noted that the increase in the thickness of the protective film on the folded side 130 has a relatively small impact. This core 10 covering structure is suitable for batteries with a large area of ​​core 10 on the side and a certain space between the core and the casing.

[0080] In one embodiment, the thickness of the first protective film 20 ranges from 0.08 to 0.12 mm; the thickness of the second protective film 30 ranges from 0.08 to 0.12 mm. For example, the thickness of the first protective film 20 is 0.1 mm; the thickness of the second protective film 30 is 0.1 mm. By attaching the second protective film 30 to the corresponding position on the side of the core 10 and attaching the first protective film 20 to the corresponding position on the bottom surface of the core 10, the risk of short circuit of the inner core 10 caused by powder falling from the core 10 and contact with the shell is reduced. The second folded edge 310 of the second protective film 30 is folded and attached to the folded side 130 of the core 10, and the first folded edge 210 of the first protective film 20 is folded and attached to the folded side 130 of the core 10 and at least partially overlaps with the second folded edge 310, thereby avoiding the risk of the first protective film 20 or the second protective film 30 coming into contact with and sticking to the shell and falling off, thus improving the safety of the core 10. In addition, the thickness of the protective film (the first protective film 20 and the second protective film 30) has little impact, and there is no need to adjust the original battery shell.

[0081] In one embodiment, a battery is also provided, including a housing and a core-covering structure as described in any of the above embodiments; the core-covering structure is disposed within the housing.

[0082] For details regarding the core covering structure and the shell, please refer to the specific description of the core covering structure and the shell in the above embodiments, which will not be repeated here.

[0083] The core-covering structure includes a core, a first protective film, and a second protective film. The core has a bottom film-applying area and a side film-applying area. The first protective film is applied to the bottom film-applying area and has a first folded edge, which is applied to the folded side of the core. The second protective film is applied to the side film-applying area and has a second folded edge, which is applied to the folded side of the core. The second folded edge at least partially overlaps with the first folded edge, thereby covering the bottom film-applying area and the side film-applying area of ​​the core. By placing the core covered with the first and second protective films inside the housing, a corresponding battery is obtained.

[0084] In the above embodiments, by attaching a second protective film to a corresponding position on the side of the core and attaching a first protective film to a corresponding position on the bottom surface of the core, the risk of short circuit of the inner core caused by powder falling from the core and contact with the shell is reduced. By folding and attaching the second protective film to the folded side of the core with its second folded edge, and by folding and attaching the first protective film to the folded side of the core with its first folded edge, and by at least partially overlapping the second folded edge, the risk of the first or second protective film coming into contact with and sticking to the shell and falling off is avoided, thereby improving the safety of the battery.

[0085] It should be noted that the battery may also include components such as a cover plate. A specific battery may include more components than those described in the above embodiments, or combine certain components, or have different component arrangements.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A core-covering structure, characterized in that, include: The core is provided with a bottom film-applying area and a side film-applying area; A first protective film is attached to the bottom film area. The first protective film has a first folded edge, which is attached to the folded side of the core. A second protective film is attached to the side film area. The second protective film has a second folded edge, which is attached to the folded side of the core. The second folded edge at least partially overlaps with the first folded edge.

2. The core-covering structure according to claim 1, characterized in that, The side film application area includes a first side film application sub-area and a second side film application area, and the core has an adjacent bottom surface, a first film application side surface, and a second film application side surface; The bottom film application area is located on the bottom surface of the roll core, the first side film application area is located on the first film application side of the roll core, and the second side film application area is located on the second film application side of the roll core; the bottom film application area is adjacent to the first side film application area, and the bottom film application area is adjacent to the second side film application area.

3. The core covering structure according to claim 2, characterized in that, The area of ​​the bottom film-coated area is equal to the area of ​​the bottom surface of the core; The area of ​​the first side film-applied area is less than or equal to the area of ​​the first film-applied side of the core; the area of ​​the second side film-applied area is less than or equal to the area of ​​the second film-applied side of the core.

4. The core covering structure according to claim 3, characterized in that, The width of the first side film area ranges from 10 to 20 mm, and the width of the second side film area ranges from 10 to 20 mm.

5. The core-covering structure according to claim 2, characterized in that, The bottom film application area includes a first bottom film application sub-area and a second bottom film application area; The first bottom film application area and the second bottom film application area are disposed on the bottom surface of the core; the first bottom film application area is adjacent to the first side film application area, and the second bottom film application area is adjacent to the second side film application area.

6. The core-covering structure according to claim 5, characterized in that, The sum of the areas of the first bottom film-attached area and the second bottom film-attached area is less than the area of ​​the bottom surface of the core. The area of ​​the first side film-applied area is smaller than the area of ​​the first film-applied side of the roll core; the area of ​​the second side film-applied area is smaller than the area of ​​the second film-applied side of the roll core.

7. The core-covering structure according to claim 5, characterized in that, The area of ​​the first folded edge is smaller than the area of ​​the folded side surface of the core; The area of ​​the second folded edge is smaller than the area of ​​the folded side surface of the core.

8. The core-covering structure according to claim 7, characterized in that, The width of the first folded edge ranges from 10 to 20 millimeters; The width of the second folded edge ranges from 10 to 20 millimeters.

9. The core-covering structure according to claim 7, characterized in that, The width of the second folded edge ranges from two-thirds to three-quarters of the width of the folded side of the core.

10. The core covering structure according to any one of claims 1 to 9, characterized in that, The thickness of the first protective film ranges from 0.08 to 0.12 mm; The thickness of the second protective film ranges from 0.08 to 0.12 mm.

11. A battery, characterized in that, It includes a housing and a core covering structure as described in any one of claims 1 to 10; the core covering structure is disposed within the housing.

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