Insulation assembly, battery cell and coating method of battery cell

Abstract

The invention relates to an insulation assembly, a battery cell and a coating method of the battery cell. The insulation assembly comprises a bottom supporting plate and an insulation membrane, and the insulation membrane is sequentially provided with a first coating membrane, a second coating membrane, a third coating membrane, a fourth coating membrane and a fifth coating membrane in the first direction; according to the insulation assembly, the battery cell and the coating method of the battery cell, the bottom surface with a relatively large area of the battery cell can be placed on the third coating area, so that the stability between the battery cell and the insulation assembly is enhanced, and the insulation assembly can conveniently carry out annular coating and bonding on the battery cell; and the first coating region and the fifth coating region can cover and seal the top surface with a larger area of the battery cell in an overlapping manner, so that the sealing quantity is effectively reduced to avoid yield loss caused by abnormal opening and the like, and the packaging effect and the product safety are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to an insulating component, a battery cell, and a method for coating the battery cell. Background Art

[0002] In order to improve the safety performance of square lithium batteries during actual use, it is usually necessary to add an internal insulating component inside the battery cell to prevent short-circuit corrosion between the electrode group and the aluminum shell.

[0003] At present, the insulating component is usually an insulating film, and the pole group is wrapped in a U-shape. However, when the insulating film is wrapped in a U-shape, the relative position of the insulating film and the top cover is often very poor due to the tolerance accumulation caused by the pole pieces and winding of the pole group. Some hot melting points may not be covered, or even the insulating film may extend beyond the top cover, resulting in poor shell cover welding explosion points, affecting the packaging effect. When the insulating film is wrapped in a U-shape and the battery cell is wound, there is usually a high redundancy in the arc transition angles on both sides of the pole group. When the insulating film is wrapped on the side, it is easy to cause the upper and lower films to open, which will cause damage when the battery cell is circulated and put into the shell, affecting the yield and product safety. Summary of the invention

[0004] Based on this, it is necessary to provide an insulating component, a battery cell and a battery cell coating method to address the problem that the U-shaped coating of the electrode group by the above-mentioned insulating film affects the packaging effect and product safety.

[0005] According to one aspect of the present application, there is provided an insulation assembly for covering a battery core, the insulation assembly comprising a bottom support plate and an insulation film;

[0006] The insulating films are arranged in sequence along the first direction in the form of a first covering film, a second covering film, a third covering film, a fourth covering film and a fifth covering film;

[0007] Along a second direction perpendicular to the first direction, the first covering film sheet includes a first covering area and a first folding area connected to each other, the third covering film sheet includes a third covering area and a third folding area connected to each other, and the fifth covering film sheet includes a fifth covering area and a fifth folding area connected to each other;

[0008] Along the first direction, the sizes of the first coating area, the third coating area and the fifth coating area are all larger than the size of the second coating film, and the sizes of the first coating area, the third coating area and the fifth coating area are all larger than the size of the fourth coating film;

[0009] Along the second direction, the sizes of the first coating area, the third coating area and the fifth coating area are all equal to the size of the second coating film, and the sizes of the first coating area, the third coating area and the fifth coating area are all equal to the size of the fourth coating film;

[0010] Along the first direction, the size of the bottom support plate is equal to the size of the third covering area, and along the second direction, the size of the bottom support plate is greater than the size of the third folding area.

[0011] In one embodiment, along the first direction, the size of the first covering film sheet is smaller than that of the third covering film sheet and larger than half of the size of the third covering film sheet; the size of the fifth covering film sheet is smaller than that of the third covering film sheet and larger than half of the size of the third covering film sheet.

[0012] In one embodiment, along the first direction, the size of the first covering film sheet is consistent with the size of the fifth covering film sheet.

[0013] In one embodiment, along the second direction, the size of the first covering film sheet is equal to the size of the third covering film sheet, and the size of the first covering film sheet is equal to the size of the fifth covering film sheet.

[0014] In one embodiment, along the first direction, the size of the second covering film sheet is consistent with the size of the fourth covering film sheet; along the second direction, the size of the second covering film sheet is consistent with the size of the fourth covering film sheet.

[0015] In one embodiment, along the first direction, the dimension of the side of the first folded area away from the first covering area is smaller than the dimension of the side of the first folded area connected to the first covering area; and / or,

[0016] Along the first direction, the dimension of the side of the third folding area away from the third covering area is smaller than the dimension of the side of the third folding area connecting the third covering area; and / or,

[0017] Along the first direction, a dimension of a side of the fifth folding region away from the fifth covering region is smaller than a dimension of a side of the fifth folding region connected to the fifth covering region.

[0018] In one embodiment, the material of the bottom support plate is consistent with the material of the insulating diaphragm.

[0019] In one embodiment, the insulation component also includes a reinforcement strip, which includes a first attachment surface and a second attachment surface vertically connected, the first attachment surface is used to attach to the bottom support plate, and the second attachment surface is used to attach to the first covering film sheet and the fifth covering film sheet.

[0020] According to another aspect of the present application, a method for coating a battery cell is provided, which is used for the insulating component in any one of the above embodiments, comprising:

[0021] Obtain battery cells and insulation components;

[0022] Laminating the bottom surface of the battery cell to the third coating area;

[0023] Laying the second covering film sheet and the fourth covering film sheet of the insulating assembly onto two opposite first side surfaces of the battery cell respectively;

[0024] Laminating the first coating area of ​​the insulating component on the top surface of the battery cell;

[0025] Laying the fifth covering area of ​​the insulating component onto the top surface of the battery cell and the first covering area;

[0026] Bonding the first coating area, the second coating film, the third coating area, the fourth coating film and the fifth coating area to the top cover of the battery cell;

[0027] Laying the first folded area, the third folded area and the fifth folded area on the second side surface opposite to the top cover;

[0028] Bonding the bottom support plate to the first folding area, the third folding area, the fifth folding area and the second side surface opposite to the top cover;

[0029] Wherein, the second side surface is perpendicular to the first side surface.

[0030] In one embodiment, the battery core coating method further includes:

[0031] Get reinforcement strips;

[0032] The first attachment surface of the reinforcement strip is attached to the bottom support plate, and the second attachment surface of the reinforcement strip is attached to the first covering film sheet and the fifth covering film sheet.

[0033] The above-mentioned insulating component, battery cell and battery cell coating method, by making the sizes of the first coating area, the third coating area and the fifth coating area along the first direction larger than the sizes of the second coating film and the fourth coating film along the first direction, and making the sizes of the first coating film, the third coating film and the fifth coating film along the second direction larger than the sizes of the second coating film and the fourth coating film along the second direction, can make the bottom surface of the battery cell with a larger area be placed on the third coating area when the battery cell is placed on the insulating component, thereby enhancing the stability between the battery cell and the insulating component, facilitating the insulating component to perform annular coating and bonding on the battery cell, and the first coating area and the fifth coating area can cover and overlap the top surface of the battery cell with a larger area, thereby effectively reducing the number of seals to avoid yield loss caused by abnormalities such as opening, and the bottom support plate can further ensure the coating effect of the insulating film on the battery cell, thereby ensuring the packaging effect and product safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of an insulating diaphragm of an insulating component in some embodiments of the present application.

[0035] Figure 2 This is a schematic diagram of the structure between the insulating film and the battery cell of the insulating assembly of some embodiments of the present application.

[0036] Figure 3 This is a schematic diagram of a portion of the structure between the insulating component and the battery cell in some embodiments of the present application.

[0037] Figure 4 This is a schematic diagram of the structure between the insulating component and the battery cell in some embodiments of the present application.

[0038] Reference numerals:

[0039] 1. battery cell; 11. top surface; 13. first side surface; 14. top cover; 15. second side surface;

[0040] 2. Bottom support plate;

[0041] 3. Insulating diaphragm;

[0042] 31. first covering film; 311. first covering area; 312. first folding area;

[0043] 32. a second coating film;

[0044] 33. third covering film; 331. third covering area; 332. third folding area;

[0045] 34. Fourth coating film;

[0046] 35. fifth covering film; 351. fifth covering area; 352. fifth folding area;

[0047] 4. Reinforcement strips. DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0054] See also Figure 1-Figure 3 , an embodiment of the present application provides an insulating component for wrapping a battery cell 1. The insulating component includes a bottom support plate 2 and an insulating film 3. The insulating film 3 is used to wrap the battery cell 1 in an annular manner, and the bottom support plate 2 is used to cover the area where the insulating film 3 is not in contact with the battery cell 1, thereby assisting the insulating film 3 in wrapping the battery cell 1.

[0055] In addition, the battery cell 1 includes a top surface 11 and a bottom surface that are oppositely and parallelly arranged, two first side surfaces 13 that are oppositely and parallelly arranged, and a top cover 14 and a second side surface 15 that are oppositely and parallelly arranged. The top surface 11 is perpendicular to the first side surface 13 and the second side surface 15, and the first side surface 13 and the second side surface 15 are perpendicular.

[0056] See also Figure 1-Figure 3 In the specific configuration, the insulating film 3 is sequentially arranged along the first direction, including the first covering film 31, the second covering film 32, the third covering film 33, the fourth covering film 34 and the fifth covering film 35. The first covering film 31, the second covering film 32, the third covering film 33, the fourth covering film 34 and the fifth covering film 35 can be divided by a red knife line, so that the first covering film 31, the second covering film 32, the third covering film 33, the fourth covering film 34 and the fifth covering film 35 can be bent.

[0057] Along the second direction perpendicular to the first direction, the first covering film sheet 31 includes a first covering area 311 and a first folding area 312 connected to each other, and the first covering area 311 and the first folding area 312 can be divided by a red knife line, so as to facilitate bending between the first covering area 311 and the first folding area 312. The third covering film sheet 33 includes a third covering area 331 and a third folding area 332 connected to each other, and the third covering area 331 and the third folding area 332 can be divided by a red knife line, so as to facilitate bending between the third covering area 331 and the third folding area 332. The fifth covering film sheet 35 includes a fifth covering area 351 and a fifth folding area 352 connected to each other, and the fifth covering area 351 and the fifth folding area 352 can be divided by a red knife line, so as to facilitate bending between the fifth covering area 351 and the fifth folding area 352.

[0058] Along the first direction, the sizes of the first coating area 311, the third coating area 331 and the fifth coating area 351 are all larger than the size of the second coating film 32, and the sizes of the first coating area 311, the third coating area 331 and the fifth coating area 351 are all larger than the size of the fourth coating film 34. This structure allows the first coating area 311, the third coating area 331 and the fifth coating area 351 to respectively fit and cover a part of the top surface 11, the entire bottom surface and another part of the top surface 11 of the battery cell 1, and the second coating film 32 and the fourth coating film 34 to respectively fit and cover the two opposite first side surfaces 13 of the battery cell 1.

[0059] Along the second direction, the sizes of the first coating area 311, the third coating area 331 and the fifth coating area 351 are all equal to the size of the second coating film 32, and the sizes of the first coating area 311, the third coating area 331 and the fifth coating area 351 are all equal to the size of the fourth coating film 34. This structure allows the first coating area 311, the third coating area 331 and the fifth coating area 351 to fit and cover the second side surface 15 of the battery cell 1 after the second coating film 32 and the fourth coating film 34 fit and cover the two opposite first side surfaces 13 of the battery cell 1.

[0060] Along the first direction, the size of the bottom support plate 2 is equal to the size of the third coating area 331, and along the second direction, the size of the bottom support plate 2 is greater than the size of the third folding area 332. Specifically, along the first direction, the size of the bottom support plate 2 is equal to the size of the battery cell 1, and along the second direction, the size of the bottom support plate 2 is greater than or equal to the size of the battery cell 1. This structure can ensure that the bottom support plate 2 covers the areas where the first coating area 311, the third coating area 331 and the fifth coating area 351 are not in contact with the battery cell 1 after the first coating area 311, the third coating area 331 and the fifth coating area 351 are fitted and coated on the second side 15 of the battery cell 1. It can be understood that in the embodiment of the present application, the projection area of ​​the first coating area 311, the third coating area 331 and the fifth coating area 351 on the second side 15 is smaller than the area of ​​the second side 15, and the projection area of ​​the bottom support plate 2 on the second side 15 is equal to the area of ​​the second side 15.

[0061] The insulating component, battery cell and battery cell coating method of the present application, by making the sizes of the first coating area 311, the third coating area 331 and the fifth coating area 351 along the second direction larger than the sizes of the second coating film 32 and the fourth coating film 34 along the second direction, can enable the battery cell 1 to be placed on the insulating component with the bottom surface of the battery cell 1 having a larger area placed on the third coating area 331, thereby enhancing the stability between the battery cell 1 and the insulating component, and facilitating the insulating component to perform annular coating and bonding on the battery cell 1, and the first coating area 311 and the fifth coating area 351 can cover and overlap the top surface 11 of the battery cell 1 having a larger area, thereby effectively reducing the number of seals to avoid yield loss caused by abnormalities such as opening, and the bottom support plate 2 can further ensure the coating effect of the insulating film 3 on the battery cell 1, thereby ensuring the packaging effect and product safety.

[0062] See also Figure 1-Figure 3 In one embodiment, along the first direction, the size of the first covering film 31 is smaller than the size of the third covering film 33, and is larger than half the size of the third covering film 33. The size of the fifth covering film 35 is smaller than the size of the third covering film 33, and is larger than half the size of the third covering film 33. This structure can ensure that the first covering film 31 and the fifth covering film 35 completely cover the top surface 11 of the battery cell 1, and can also ensure that the coverage area between the first covering film 31 and the fifth covering film 35 is smaller than the area of ​​the top surface 11 of the battery cell 1, thereby facilitating the sealing operation of the overlap between the first covering film 31 and the fifth covering film 35.

[0063] In one embodiment, along the first direction, the size of the first covering film 31 is consistent with the size of the fifth covering film 35, and the production of the insulating film 3 is facilitated by the standardized setting.

[0064] In one embodiment, along the second direction, the size of the first covering film 31 is equal to the size of the third covering film 33, and the size of the first covering film 31 is equal to the size of the fifth covering film 35. This arrangement allows the insulating film 3 to be a square film structure with a notch as a whole, which is convenient for production.

[0065] In one embodiment, along the first direction, the size of the second covering film 32 is consistent with the size of the fourth covering film 34; along the second direction, the size of the second covering film 32 is consistent with the size of the fourth covering film 34. This structure can ensure the adhesion effect of the second covering film 32 and the fourth covering film 34 to the two first side surfaces 13 of the battery cell 1, and facilitate the production of the insulating film 3 through standardized settings.

[0066] In one embodiment, along the first direction, the size of the side of the first folded area 312 away from the first encapsulating area 311 is smaller than the size of the side of the first folded area 312 connected to the first encapsulating area 311. This structure can facilitate the bonding of the first encapsulating area 311 with the second side surface 15 of the battery cell 1, and avoid redundancy in the transition angle during the bonding process. It can be understood that in the embodiment of the present application, the first folded area 312 is a right-angled trapezoidal structure.

[0067] Along the first direction, the dimension of the side of the third folded area 332 away from the third enveloping area 331 is smaller than the dimension of the side of the third folded area 332 connected to the third enveloping area 331. This structure can facilitate the lamination of the third enveloping area 331 with the second side surface 15 of the battery cell 1, and avoid the redundancy of the transition angle during the lamination process. It can be understood that in the embodiment of the present application, the third folded area 332 is an isosceles trapezoidal structure.

[0068] Along the first direction, the size of the side of the fifth folded area 352 away from the fifth enveloping area 351 is smaller than the size of the side of the fifth folded area 352 connected to the fifth enveloping area 351. This structure can facilitate the bonding of the fifth enveloping area 351 with the second side surface 15 of the battery cell 1, and avoid the redundancy of the transition angle during the bonding process. It can be understood that in the embodiment of the present application, the fifth folded area 352 is a right-angled trapezoidal structure.

[0069] In one embodiment, the material of the bottom support plate 2 is consistent with the material of the insulating diaphragm 3 to ensure that the bottom support plate 2 has the same insulating effect as the insulating diaphragm 3, and the consistent material can also effectively save production costs.

[0070] See also Figure 1-Figure 4 In one embodiment, the insulating assembly further includes a reinforcing strip 4, which includes a first attachment surface and a second attachment surface connected vertically, wherein the first attachment surface is used to attach to the bottom support plate 2, and the second attachment surface is used to attach to the first covering film 31 and the fifth covering film 35. The reinforcing strip 4 can further enhance the connection stability between the bottom support plate 2 and the insulating film 3.

[0071] According to another aspect of the present application, a battery cell is provided, comprising an insulating component in any one of the above embodiments. The battery cell of the present application makes the dimensions of the first coating area, the third coating area and the fifth coating area of ​​the insulating component along the first direction larger than the dimensions of the second coating film and the fourth coating film along the first direction, and makes the dimensions of the first coating film, the third coating film and the fifth coating film of the insulating component along the second direction larger than the dimensions of the second coating film and the fourth coating film along the second direction, so that when the battery cell is placed on the insulating component, the bottom surface of the battery cell with a larger area can be placed on the third coating area, thereby enhancing the stability between the battery cell and the insulating component, facilitating the insulating component to perform annular coating and bonding on the battery cell, and the first coating area and the fifth coating area can cover and overlap the top surface of the battery cell with a larger area, thereby effectively reducing the number of seals to avoid yield loss caused by abnormalities such as opening, and the bottom support plate can further ensure the coating effect of the insulating film on the battery cell, thereby ensuring the packaging effect and product safety.

[0072] According to another aspect of the present application, a method for coating a battery cell is provided, which is used for the battery cell in any one of the above embodiments, comprising:

[0073] Obtain a battery cell 1 and an insulating component. The battery cell 1 includes a top surface 11 and a bottom surface that are oppositely and parallelly arranged, two first side surfaces 13 that are oppositely and parallelly arranged, and a top cover 14 and a second side surface 15 that are oppositely and parallelly arranged. The top surface 11 is perpendicular to the first side surface 13 and the second side surface 15, and the first side surface 13 and the second side surface 15 are perpendicular.

[0074] The insulating assembly includes an insulating film 3 and a bottom support plate 2, and the insulating assembly includes a first covering film 31, a second covering film 32, a third covering film 33, a fourth covering film 34 and a fifth covering film 35 arranged in sequence along a first direction. Along a second direction perpendicular to the first direction, the first covering film 31 includes a first covering area 311 and a first folding area 312 connected to each other, the third covering film 33 includes a third covering area 331 and a third folding area 332 connected to each other, and the fifth covering film 35 includes a fifth covering area 351 and a fifth folding area 352 connected to each other.

[0075] The bottom surface of the battery cell 1 is attached to the third coating area 331 . Specifically, the insulating assembly is placed on the workstation first, and then the battery cell 1 is placed on the insulating assembly, and the bottom surface of the battery cell 1 is located on the third coating area 331 of the third coating film 33 .

[0076] The second coating film sheet 32 ​​and the fourth coating film sheet 34 of the insulating component are respectively attached to the two opposite first side surfaces 13 of the battery cell 1, the first coating area 311 of the insulating component is attached to the top surface 11 of the battery cell 1, and the fifth coating area 351 of the insulating component is attached to the top surface 11 of the battery cell 1 and the first coating area 311. Specifically, the second coating film sheet 32 ​​of the insulating component is attached to one of the first side surfaces 13 of the battery cell 1, and the first coating area 311 of the insulating component is attached to a portion of the top surface 11 of the battery cell 1, and then the fourth coating film sheet 34 of the insulating component is attached to the other first side surface 13 of the battery cell 1, and the fifth coating area 351 of the insulating component is attached to another portion of the top surface 11 of the battery cell 1 and the first coating area 311.

[0077] The first coating area 311, the second coating film 32, the third coating area 331, the fourth coating film 34 and the fifth coating area 351 are bonded to the top cover 14 of the battery cell 1, and the fifth coating area 351 is bonded to the part where the first coating area 311 is attached. Specifically,

[0078] The first coating area 311, the second coating film 32, the third coating area 331, the fourth coating film 34 and the fifth coating area 351 are bonded to the top cover 14 by hot-melting plastic. The overlapped part of the fifth coating area 351 and the first coating area 311 is bonded by hot-melting plastic.

[0079] The first folding area 312, the third folding area 332 and the fifth folding area 352 are attached to the second side surface 15 opposite to the top cover 14, and the bottom support plate 2 is bonded to the first folding area 312, the third folding area 332, the fifth folding area 352 and the second side surface 15 opposite to the top cover 14. Specifically, the first folding area 312, the third folding area 332 and the fifth folding area 352 are attached to the second side surface 15 in sequence, and the bottom support plate 2 is bonded to the first folding area 312, the third folding area 332, the fifth folding area 352 and the second side surface 15 not attached to the first folding area 312, the third folding area 332 and the fifth folding area 352 by hot-melting plastic.

[0080] In one embodiment, the method for coating a battery cell further includes:

[0081] Obtain the reinforcing strip 4, attach the first attachment surface of the reinforcing strip 4 to the bottom support plate 2, and attach the second attachment surface of the reinforcing strip 4 to the first covering film 31 and the fifth covering film 35. The reinforcing strip 4 is L glue, and the reinforcing strip 4 can further enhance the connection stability between the bottom support plate 2 and the insulating film 3.

[0082] In summary, the battery cell coating method of the present application makes the sizes of the first coating area, the third coating area and the fifth coating area along the first direction larger than the sizes of the second coating film and the fourth coating film along the first direction, and makes the sizes of the first coating film, the third coating film and the fifth coating film along the second direction larger than the sizes of the second coating film and the fourth coating film along the second direction. When the battery cell is placed on the insulating component, the bottom surface of the battery cell with a larger area can be placed on the third coating area, thereby enhancing the stability between the battery cell and the insulating component, facilitating the insulating component to perform annular coating and bonding on the battery cell, and the first coating area and the fifth coating area can cover and overlap the top surface of the battery cell with a larger area, thereby effectively reducing the number of seals to avoid yield loss caused by abnormalities such as opening, and the bottom support plate can further ensure the coating effect of the insulating film on the battery cell, thereby ensuring the packaging effect and product safety.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An insulating component for covering a battery core, characterized in that: The insulating assembly comprises a bottom support plate and an insulating diaphragm; The insulating films are arranged in sequence along the first direction in the form of a first covering film, a second covering film, a third covering film, a fourth covering film and a fifth covering film; Along a second direction perpendicular to the first direction, the first covering film sheet includes a first covering area and a first folding area connected to each other, the third covering film sheet includes a third covering area and a third folding area connected to each other, and the fifth covering film sheet includes a fifth covering area and a fifth folding area connected to each other; Along the first direction, the sizes of the first coating area, the third coating area and the fifth coating area are all larger than the size of the second coating film, and the sizes of the first coating area, the third coating area and the fifth coating area are all larger than the size of the fourth coating film; Along the second direction, the sizes of the first coating area, the third coating area and the fifth coating area are all equal to the size of the second coating film, and the sizes of the first coating area, the third coating area and the fifth coating area are all equal to the size of the fourth coating film; Along the first direction, the size of the bottom support plate is equal to the size of the third covering area, and along the second direction, the size of the bottom support plate is greater than the size of the third folding area.

2. The insulation assembly according to claim 1, characterized in that: Along the first direction, the size of the first covering film sheet is smaller than that of the third covering film sheet and larger than half of the size of the third covering film sheet; the size of the fifth covering film sheet is smaller than that of the third covering film sheet and larger than half of the size of the third covering film sheet.

3. The insulation assembly according to claim 1, characterized in that: Along the first direction, the size of the first covering film sheet is consistent with the size of the fifth covering film sheet.

4. The insulation assembly according to claim 1, characterized in that: Along the second direction, the size of the first covering film sheet is equal to the size of the third covering film sheet, and the size of the first covering film sheet is equal to the size of the fifth covering film sheet.

5. The insulation assembly according to claim 1, characterized in that: Along the first direction, the size of the second covering film sheet is consistent with the size of the fourth covering film sheet; along the second direction, the size of the second covering film sheet is consistent with the size of the fourth covering film sheet.

6. The insulation assembly according to claim 1, characterized in that: Along the first direction, the dimension of the side of the first folded area away from the first covering area is smaller than the dimension of the side of the first folded area connecting the first covering area; and / or, Along the first direction, the dimension of the side of the third folding area away from the third covering area is smaller than the dimension of the side of the third folding area connecting the third covering area; and / or, Along the first direction, a dimension of a side of the fifth folding region away from the fifth covering region is smaller than a dimension of a side of the fifth folding region connected to the fifth covering region.

7. The insulation assembly according to claim 1, characterized in that: The material of the bottom support plate is consistent with the material of the insulating diaphragm.

8. The insulation assembly according to claim 1, characterized in that: The insulation assembly also includes a reinforcement strip, which includes a first attachment surface and a second attachment surface that are vertically connected. The first attachment surface is used to be attached to the bottom support plate, and the second attachment surface is used to be attached to the first covering film sheet and the fifth covering film sheet.

9. A battery cell, characterized in that: Comprising the insulation assembly as described in any one of claims 1-8.

10. A method for coating a battery core, used for the battery core as claimed in claim 9, characterized in that: include: Obtain battery cells and insulation components; Laminating the bottom surface of the battery cell to the third coating area; Laying the second covering film sheet and the fourth covering film sheet of the insulating assembly onto two opposite first side surfaces of the battery cell respectively; Laminating the first coating area of ​​the insulating component on the top surface of the battery cell; Laying the fifth covering area of ​​the insulating component onto the top surface of the battery cell and the first covering area; Bonding the first coating area, the second coating film, the third coating area, the fourth coating film and the fifth coating area to the top cover of the battery cell; Laying the first folded area, the third folded area and the fifth folded area on the second side surface opposite to the top cover; Bonding the bottom support plate to the first folding area, the third folding area, the fifth folding area and the second side surface opposite to the top cover; Wherein, the second side surface is perpendicular to the first side surface.

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