Coating structure and lithium battery

Abstract

The utility model discloses a coating structure, including a flame retardant coating and an insulating coating; one side of the flame retardant coating is coated on the surface to be coated, and the other side of the flame retardant coating is coated with the insulating coating, the coating area of ​​the flame retardant coating is smaller than the surface area of ​​the surface to be coated, the insulating coating is coated on the surface of the flame retardant coating and on the surface to be coated that is not covered by the flame retardant coating, and the insulating coating forms a thin layer area located on the surface of the flame retardant coating and a thick layer area located on the surface to be coated. The utility model realizes the reasonable arrangement of the coverage area of ​​the flame retardant coating and the coverage area of ​​the insulating coating, plays an effective flame retardant and insulating role, and at the same time, achieves a good heat dissipation function.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and in particular relates to a coating structure and a lithium battery. Background Art

[0002] The core component of electric vehicles is the power battery, and its safety has also become a concern for the automotive industry and consumers. The focus of power battery safety is heat management. Factors such as overcharging, overheating, short circuit, and collision may cause thermal runaway of the power battery, which becomes a hidden danger leading to combustion. For safety reasons, the basic requirements for the material of the battery shell protection design are heat resistance, flame retardancy, and insulation performance.

[0003] Existing lithium battery shell protection designs mostly use shells coated with PVC or PE blue film, which can help isolate the battery from the external environment, play the role of insulation, waterproofing, and aesthetics, and improve the safety performance and service life of the battery. However, due to the material and structural characteristics of the PE blue film itself, when an abnormal reaction occurs inside the battery, it may cause thermal runaway of the PE blue film, thereby aggravating the harm of the accident. Since the processing, production and coating of the PE blue film itself require certain process and material costs, and increase the investment in production line coating equipment, the cost of battery products will increase. From the perspective of the blue film coating effect, the coating is prone to adverse problems. The blue film will have wrinkles and bubbles, affecting the appearance of the product, and it is difficult to re-coat, affecting the straight-through rate of the production line. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems and provide a coating structure and a lithium battery, so as to realize the setting of a flame retardant coating and an insulating coating on the battery shell, reasonably arrange the coverage area of ​​the flame retardant coating and the coverage area of ​​the insulating coating, play an effective flame retardant and insulating role, and at the same time, achieve a good heat dissipation function. In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A coating structure comprises a flame retardant coating and an insulating coating; one side of the flame retardant coating is coated on a surface to be coated, and the other side of the flame retardant coating is coated on the insulating coating; the coating area of ​​the flame retardant coating is smaller than the surface area of ​​the surface to be coated; the insulating coating is coated on the surface of the flame retardant coating and on the surface to be coated that is not covered by the flame retardant coating; the insulating coating forms a thin layer area located on the surface of the flame retardant coating and a thick layer area located on the surface to be coated.

[0006] Specifically, the coating structure is arranged on a battery shell, and the surface of the battery shell is the surface to be coated.

[0007] Specifically, the coating area of ​​the flame retardant coating is not less than one third of the surface area of ​​the surface to be coated.

[0008] Specifically, the coating thickness of the flame retardant coating is 0.05-2 mm; the coating thickness of the thick layer area of ​​the insulating coating is 0.06-3 mm, and the coating thickness of the thin layer area of ​​the insulating coating is 0.01-1 mm.

[0009] Specifically, the flame retardant coating includes a plurality of regional coating blocks, and the regional coating blocks are arranged at intervals from each other.

[0010] Specifically, the insulating coating covers a plurality of the regional coating blocks to form a thin layer region; the insulating coating covers the interval space between the regional coating blocks to form a thick layer region.

[0011] Specifically, the surface of the insulating coating is a plane or a non-plane, and the thickness of the thick layer region of the insulating coating is greater than the thickness of the flame retardant coating.

[0012] Specifically, the flame retardant coating is arranged on a side wall of the battery casing, and a plurality of regional coating blocks are arranged horizontally at intervals along the surface of the battery casing, one end of the regional coating block is located on one side of the side wall of the battery casing, and the other end of the regional coating block is located on the other side of the side wall of the battery casing.

[0013] Specifically, the plurality of regional coating blocks are distributed in an array on the surface of the battery housing, and the plurality of regional coating blocks arranged along the same horizontal direction and / or along the same vertical direction on the surface of the battery housing are equidistantly spaced.

[0014] A lithium battery comprises the coating structure.

[0015] Compared with the prior art, the coating structure and lithium battery of the utility model have the following beneficial effects:

[0016] A coating structure is formed by a flame retardant coating and an insulating coating. The coating area of ​​the flame retardant coating is smaller than the surface area of ​​the battery casing, so that the flame retardant coating has a good heat dissipation function while playing a flame retardant role, saving the coating cost of the flame retardant coating and reducing the weight of the entire battery casing; the insulating coating is matched with the flame retardant coating for coating, so that the entire battery casing has an insulating function, thereby enhancing the performance of the overall coating structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery housing provided in an embodiment of the present application;

[0018] Figure 2 A partial cross-sectional schematic diagram of a battery housing and a coating structure provided in an embodiment of the present application;

[0019] Figure 3 This is one of the main structural schematic diagrams of the flame retardant coating provided in the embodiment of the present application;

[0020] Figure 4 This is the second schematic diagram of the main structure of the flame retardant coating provided in an embodiment of the present application.

[0021] Reference numerals:

[0022] Flame retardant coating 1, regional coating block 11;

[0023] Insulating coating 2, thin layer region 21, thick layer region 22;

[0024] Surface to be coated 3;

[0025] Battery housing 4. DETAILED DESCRIPTION

[0026] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0027] Embodiment 1

[0028] This embodiment provides a coating structure, including a flame retardant coating 1 and an insulating coating 2; one side of the flame retardant coating 1 is coated on a surface to be coated 3, and the other side of the flame retardant coating 1 is coated on the insulating coating 2.

[0029] The coating area of ​​the flame retardant coating 1 is smaller than the surface area of ​​the surface 3 to be coated, and not less than one third of the surface area of ​​the surface 3 to be coated. The insulating coating 2 is coated on the surface of the flame retardant coating 1 and on the surface 3 to be coated that is not covered by the flame retardant coating 1. The insulating coating 2 forms a thin layer area 21 located on the surface of the flame retardant coating 1 and a thick layer area 22 located on the surface 3 to be coated.

[0030] In this embodiment, a coating structure is arranged on the surface of the battery shell 4. The surface of the battery shell 4 is a surface to be coated 3. A protective layer is formed on the battery shell 4. The flame retardant coating 1 plays a flame retardant role. The flame retardant coating 1 can be formed by partial spraying, which effectively reduces the cost of the flame retardant coating 1 and the weight of the overall battery shell 4, so that the battery shell 4 has a good heat dissipation function; the insulating coating 2 plays an insulating role. The insulating coating 2 can be formed by a deposition process using a photocurable material. The insulating film layer is formed by photocuring. The insulating strength is high, the adhesion is extremely strong, and it has high resistance to water vapor and corrosion. It does not require heating and curing, and does not require vacuum treatment. It is simpler than the traditional blue film coating process.

[0031] Figure 1 A schematic diagram of the structure of a battery housing provided in an embodiment of the present application; Figure 2A schematic partial cross-sectional view of a battery housing and coating structure provided in an embodiment of the present application.

[0032] like Figure 1 , Figure 2 As shown, this embodiment provides a coating structure, and the coating area of ​​the flame retardant coating 1 can be entirely coated on the surface of the battery housing 4, which is a conventional coating selection method and cannot achieve the effect brought by the solution of this embodiment.

[0033] The coating area of ​​the flame retardant coating 1 is not less than one third of the surface area of ​​the battery casing 4. Since the coating area of ​​the flame retardant coating 1 is smaller than the surface area of ​​the battery casing 4, the flame retardant coating 1 is arranged as a plurality of regional coating blocks 11, and the regional coating blocks 11 are arranged at intervals from each other, which has a better heat dissipation effect. At the same time, it does not affect the flame retardant function of the surface of the overall battery casing 4.

[0034] Correspondingly, the coating positions of the insulating coating 2 and the flame retardant coating 1 are matched, a portion of the insulating coating 2 covers the flame retardant coating 1 to form a thin layer area 21 located on each regional coating block 11, and another portion of the insulating coating 2 covers the interval space between each regional coating block 11 to form a thick layer area 22.

[0035] The coating thickness of the flame retardant coating 1 is 0.05-2 mm; the coating thickness of the thick layer region 22 of the insulating coating 2 is 0.06-3 mm, and the coating thickness of the thin layer region 21 thereof is 0.01-1 mm.

[0036] The surface of the insulating coating 2 may be a plane or a non-plane. The thickness of the thick layer region 22 of the insulating coating 2 is greater than the thickness of the flame retardant coating 1. In this embodiment, the insulating coating 2 is taken as a plane. When the surface of the insulating coating 2 is a plane, the thickness of the thin layer region 21 of the insulating coating 2 is equal to the difference in thickness between the thick layer region 22 and the flame retardant coating 1. When the surface of the insulating coating 2 is a non-plane, the thickness of the thin layer region 21 of the insulating coating 2 is greater than or less than the difference in thickness between the thick layer region 22 and the flame retardant coating 1.

[0037] In this embodiment, a coating structure is formed by a flame retardant coating 1 and an insulating coating 2. The coating area of ​​the flame retardant coating 1 is smaller than the surface area of ​​the battery casing 4. The flame retardant coating 1 is provided as a plurality of regional coating blocks 11, and the regional coating blocks 11 are spaced apart from each other, so that the flame retardant coating 1 has a good heat dissipation function while playing a flame retardant role, thereby saving the coating cost of the flame retardant coating 1 and reducing the weight of the overall battery casing 4; the insulating coating 2 is coated in matching with the flame retardant coating 1, so that the overall battery casing 4 has an insulating function. The insulating coating 2 includes a thick layer area 22 and a thin layer area 21, which fully exerts the insulating effect while further improving the heat dissipation effect, reducing the cost of the insulating coating 2 and reducing the weight of the overall battery casing 4.

[0038] Embodiment 2

[0039] This embodiment optimizes the coating structure on the basis of the above embodiment, and in particular provides a specific implementation method of a flame retardant coating:

[0040] The flame retardant coating 1 is configured as a plurality of regional coating blocks 11, and the regional coating blocks 11 are spaced apart from each other.

[0041] Figure 3 This is one of the main structural schematic diagrams of the flame retardant coating provided in the embodiment of the present application; Figure 4 This is the second schematic diagram of the main structure of the flame retardant coating provided in an embodiment of the present application.

[0042] like Figure 3 , Figure 4 As shown, the surface of the regional coating block 11 can be a strip structure, a rectangular structure, a diamond structure, a fan structure, a circular structure or other special-shaped structures. Spaces are formed between the regional coating blocks 11, thereby achieving effective heat dissipation of the flame retardant coating 1.

[0043] The battery housing 4 is a square column structure, which has four side walls, a top surface, and a bottom surface. The top surface of the battery housing 4 is provided with an explosion-proof valve and a pole. The four side walls, a top surface, and a bottom surface are all planes, and the connection between the connected side walls is an R angle. The size parameters of one side wall of the battery housing 4 are a length of 148 mm and a width of 115 mm, wherein the length of one side wall is the distance in the horizontal direction, and the width of the side wall is the distance in the vertical direction.

[0044] Taking the regional coating block 11 as an example of a strip structure, the flame retardant coating 1 can be provided on one side wall of the battery housing 4, or on multiple side walls of the battery housing 4. Several regional coating blocks 11 are arranged horizontally and spaced apart along the surface of the battery housing 4, one end of the regional coating block 11 is located on one side of the side wall edge of the battery housing 4, and the other end of the regional coating block 11 is located on the other side of the side wall edge of the battery housing 4. The length of the regional coating block 11 is the distance in the horizontal direction, and the width is the distance in the vertical direction. In this embodiment, the length of the regional coating block 11 is 148 mm, the width is 13 mm, and the number is three.

[0045] Taking the regional coating block 11 as a rectangular structure as an example, the flame retardant coating 1 can be set on a side wall of the battery housing 4, or on multiple side walls of the battery housing 4. Several regional coating blocks 11 are distributed in an array on the surface of the battery housing 4, and the surface of the battery housing 4 is arranged along the same horizontal direction and / or along the same vertical direction. Several regional coating blocks 11 are arranged at equal intervals. The length of the regional coating block 11 is the distance in the horizontal direction, and the width is the distance in the vertical direction. In this embodiment, the length of the regional coating block 11 is 32mm, the width is 20mm, and the number is nine.

[0046] Embodiment 3

[0047] This embodiment provides a lithium battery, including the coating structure in the above embodiment. The coating structure is arranged on the surface of the lithium battery to improve the heat dissipation performance of the entire lithium battery and reduce the manufacturing cost of the lithium battery.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Coating structure, characterized by: It comprises a flame retardant coating and an insulating coating; one side of the flame retardant coating is coated on a surface to be coated, and the other side of the flame retardant coating is coated on the insulating coating; the coating area of ​​the flame retardant coating is smaller than the surface area of ​​the surface to be coated; the insulating coating is coated on the surface of the flame retardant coating and on the surface to be coated which is not covered by the flame retardant coating; the insulating coating forms a thin layer area located on the surface of the flame retardant coating and a thick layer area located on the surface to be coated.

2. The coating structure according to claim 1, characterized in that: The coating structure is arranged on a battery shell, and the surface of the battery shell is a surface to be coated.

3. The coating structure according to claim 1, characterized in that: The coating area of ​​the flame retardant coating is not less than one third of the surface area of ​​the surface to be coated.

4. The coating structure according to claim 2, characterized in that: The flame retardant coating comprises a plurality of regional coating blocks, and the regional coating blocks are arranged at intervals from each other.

5. The coating structure according to claim 4, characterized in that: The insulating coating is covered on a plurality of the regional coating blocks to form a thin layer area; the insulating coating is covered in the interval space between the regional coating blocks to form a thick layer area.

6. The coating structure according to claim 1, characterized in that: The surface of the insulating coating is a plane or a non-plane, and the thickness of a thick layer region of the insulating coating is greater than the thickness of the flame retardant coating.

7. The coating structure according to claim 6, characterized in that: The surface of the insulating coating is a plane, and the thickness of the thin layer region of the insulating coating is equal to the difference in thickness between the thick layer region and the flame retardant coating.

8. The coating structure according to claim 4, characterized in that: The flame retardant coating is arranged on a side wall of the battery casing, and a plurality of regional coating blocks are arranged horizontally at intervals along the surface of the battery casing, one end of the regional coating block is located on one side of the side wall of the battery casing, and the other end of the regional coating block is located on the other side of the side wall of the battery casing.

9. The coating structure according to claim 4, characterized in that: The plurality of regional coating blocks are distributed in an array on the surface of the battery housing, and the plurality of regional coating blocks arranged along the same horizontal direction and / or along the same vertical direction on the surface of the battery housing are equidistantly spaced.

10. A lithium battery, characterized in that: The invention comprises a coating structure as described in any one of claims 1 to 9.

Images