Battery cell and battery pack

Abstract

The present application relates to the technical field of batteries. Disclosed are a battery cell and a battery pack. The battery cell comprises a casing, an insulating layer and an isolation coating, wherein the casing has an accommodating cavity and an outer surface; the insulating layer is disposed on the outer surface of the casing; and the isolation coating is disposed on and protrudes from the side of the insulating layer away from the casing and has a hollowed-out area. The battery cell provided in the present application can reduce the risk of displacement and detachment of the isolation coating.

Description

Single cell and battery pack

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 202323174573X, filed with the Chinese Patent Office on November 22, 2023, entitled “A Single Cell and a Battery Pack,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0004] In a battery pack, numerous cells are arranged in a specific sequence. A circular frame is often placed between the closely packed cells. This creates a gap between the cells, allowing for expansion during long-term cycling.

[0005] However, the circular frame in the prior art is usually adhered to the large surface of the battery using adhesive, which causes the circular frame to easily shift or fall off.

[0006] Summary of the Invention

[0007] An embodiment of the present application provides a single battery, comprising:

[0008] a housing having a receiving cavity and an outer surface;

[0009] an insulating layer, disposed on the outer surface of the shell;

[0010] The isolation coating is arranged on a side of the insulation layer away from the shell, and the isolation coating has a hollow area.

[0011] In some possible implementations, the insulating layer is an insulating coating.

[0012] In some possible implementations, the insulating layer is an inorganic insulating material layer or a polymer insulating film layer.

[0013] In some possible implementations, the insulating layer and the isolation coating layer are made of the same material.

[0014] In some possible implementations, the insulating layer and the isolation coating are integrally provided.

[0015] In some possible implementations, the isolation coating protrusion is provided on a side of the insulation layer away from the housing.

[0016] In some possible implementations, the single battery has a first direction and a second direction that intersect each other;

[0017] The outer surface includes a first surface and a second surface arranged opposite to each other along the second direction, a third surface and a fourth surface arranged opposite to each other along the first direction, and a bottom surface, the first surface and the second surface are connected to the third surface and the fourth surface respectively, and the bottom surface is connected to the first surface, the second surface, the third surface, and the fourth surface respectively to enclose the accommodating cavity, wherein the surface area of ​​the first surface and the surface area of ​​the second surface are both greater than the surface area of ​​the third surface or the surface area of ​​the fourth surface;

[0018] The first surface and the second surface are provided with the insulating layer and the isolation coating.

[0019] In some possible implementations, the insulating layer is only provided on the first surface, the second surface, the third surface, and the fourth surface.

[0020] In some possible implementations, the first direction is parallel to the length direction of the single battery, and the second direction is parallel to the thickness direction of the single battery.

[0021] In some possible implementations, the shell includes a main shell and a top cover, wherein the main shell is a structure with an opening at one end, and the accommodating cavity is formed in the main shell.

[0022] In some possible implementations, the top cover is fixedly connected to the opening of the main shell and closes the opening.

[0023] In some possible implementations, the outer surface includes a surface of the main shell away from the side of the accommodating cavity and a surface of the top cover away from the side of the accommodating cavity.

[0024] In some possible implementations, the single battery further includes a first electrode, a second electrode, an explosion-proof valve, and a label, wherein the first electrode, the second electrode, the explosion-proof valve, and the label are all disposed on the top cover.

[0025] In some possible embodiments, the areas where the first electrode, the second electrode, the explosion-proof valve, and the label are located are all functional areas, and corresponding avoidance holes are opened at positions of the insulating layer corresponding to the first electrode, the second electrode, the explosion-proof valve, and the label, and the projections of the functional areas on the insulating layer fall one-to-one in the corresponding avoidance holes.

[0026] In some possible implementations, the single battery further includes a bare cell disposed in the accommodation cavity, wherein the bare cell is electrically connected to the first electrode and the second electrode.

[0027] In some possible implementations, the isolation coating is an annular or polygonal annular structure, and the annular or polygonal annular structure surrounds the hollow area.

[0028] In some possible implementations, the isolation coating is disposed around the edge of the outer surface.

[0029] In some possible embodiments, the minimum distance between the isolation coating and the edge corresponding to the outer surface is L, 0.01mm≤L≤10mm, and / or the isolation coating has a minimum distance N between the side close to the hollow area and the side away from the hollow area, where 2mm≤N≤10mm.

[0030] In some possible embodiments, there is a minimum distance H between the side surface of the isolation coating away from the insulating layer and the insulating layer, wherein 0.1mm≤H≤1mm, and / or the shell further includes at least one functional area, the insulating layer is provided with at least one avoidance hole, and the projection of the at least one functional area on the insulating layer falls one-to-one in the at least one avoidance hole; the distance between the edge of the functional area and the opposite side of the avoidance hole in which it is located is M, wherein 0.5mm≤M≤3mm.

[0031] An embodiment of the present application further provides a battery pack, comprising a plurality of the single cells provided in the above embodiments, wherein the plurality of single cells are arranged in sequence or distributed in an array, any two adjacent single cells are connected by the isolation coating, and the hollow area allows a gap to exist between any two adjacent single cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0033] FIG1 is a schematic diagram showing a three-dimensional structure of a single cell according to one or more embodiments of the present application;

[0034] FIG2 shows a schematic diagram of an exploded structure of a single cell according to one or more embodiments of the present application;

[0035] FIG3 shows another exploded structural diagram of a single cell according to one or more embodiments of the present application;

[0036] FIG4 shows a schematic top view of a single cell according to one or more embodiments of the present application;

[0037] FIG5 shows a partial side structural schematic diagram of a single cell according to one or more embodiments of the present application.

[0038] Explanation of the main component symbols: 1000 - single cell; X - first direction; Y - second direction; 110 - housing; 111 - accommodating chamber; 112 - outer surface; 1121 - first surface; 11211 - first side; 11212 - second side; 11213 - third side; 11214 - fourth side; 1122 - second surface; 1123 - third surface; 1124 - fourth surface; 1125 - bottom surface; 1126 - top surface; 1101 - main housing; 11011 - opening; 1102 - top cover; 11021 - functional area; 121 - first electrode; 122 - second electrode; 123 - explosion-proof valve; 124 - label; 130 - bare cell; 200 - insulation layer; 201 - avoidance hole; 300 - isolation coating; 301 - hollow area; 310 - first structural segment; 320 - second structural segment; 330 - third structural segment; 340 - fourth structural segment. DETAILED DESCRIPTION

[0039] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0040] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0043] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] As shown in FIG2 , a Cartesian coordinate system is established, defining the length direction of the cell 1000 as parallel to the x-axis, the thickness direction of the cell 1000 as parallel to the y-axis, and the height direction of the cell 1000 as parallel to the z-axis. It should be understood that the above definitions are merely intended to facilitate understanding of the relative positional relationships of the various components of the cell 1000 and should not be construed as limiting the present application.

[0045] The embodiments of the present application provide a single cell and a battery pack to enhance the bonding strength between the isolation coating and the insulating layer and reduce the risk of displacement and falling off of the isolation coating.

[0046] As shown in FIG. 1 to FIG. 3 , in some embodiments, a single cell 1000 is provided, including a housing 110 , an insulating layer 200 , and an isolation coating 300 .

[0047] Among them, the interior of the shell 110 is a hollow structure, and a accommodating cavity 111 is formed. It can be understood that the shell 110 also includes an outer surface 112, and the outer surface 112 is the side surface of the shell 110 away from the accommodating cavity 111. In the embodiment, the insulating layer 200 is arranged on the outer surface 112 of the shell 110 to provide an insulating protection function. The isolation coating 300 is applied to the side of the insulating layer 200 away from the shell 110 and has a hollow area 301. The isolation coating 300 is protruding and arranged on the side of the insulating layer 200 away from the shell 110, so that there is a gap between the two adjacent single batteries 1000 through the hollow area 301, forming a buffer space.

[0048] The isolation coating in the present application is a coating with insulating chemical properties that is directly applied to the side of the insulation layer away from the shell by spraying, coating or spreading. Accordingly, the isolation coating can be directly connected to the insulation layer without the need for adhesive connection. This can improve the bonding strength between the isolation coating and the insulation layer, and reduce the risk of displacement or falling off of the isolation coating relative to the insulation layer. At the same time, a hollow area is formed so that there is a gap between any two adjacent single cells, ensuring that an effective and reliable expansion space is provided for the expansion of the single cell during subsequent recycling. At the same time, the service life of the isolation coating can also be extended.

[0049] In some embodiments, the isolation coating 300 is directly coated on the side of the insulating layer 200 away from the shell 110, so that the isolation coating 300 can be directly contacted and connected with the insulating layer 200, and a molecular chain connection can be formed between the isolation coating 300 and the insulating layer 200, thereby improving the bonding force between the isolation coating 300 and the insulating layer 200, reducing the risk of displacement or falling off of the isolation coating 300 relative to the insulating layer 200, improving product yield, and providing effective and reliable expansion space for the expansion of the single cell 1000 during subsequent recycling. At the same time, the service life of the isolation coating 300 can also be extended.

[0050] As shown in Figures 1 to 3, the housing 110 further includes a main housing 1101 and a top cover 1102. The main housing 1101 has an opening 11011 at one end, and a receiving cavity 111 is formed in the main housing 1101. The top cover 1102 can be fixedly connected to the opening 11011 of the main housing 1101 by laser welding or other means, and can seal the opening 11011 of the main housing 1101. It is understood that the outer surface 112 of the housing 110 includes the surface of the main housing 1101 on the side away from the receiving cavity 111, and the surface of the top cover 1102 on the side away from the receiving cavity 111.

[0051] In conjunction with Figure 4 , the battery cell 1000 includes a first direction X and a second direction Y. In some embodiments, the first direction X may be parallel to the length of the battery cell 1000, and the second direction Y may be parallel to the thickness of the battery cell 1000. Accordingly, the first direction X is perpendicular to the second direction Y. In some embodiments, the outer surface 112 may include a first surface 1121, a second surface 1122, a third surface 1123, a fourth surface 1124, and a bottom surface 1125 distributed on the main housing 1101, and a top surface 1126 distributed on the top cover 1102. The first surface 1121 and the second surface 1122 are disposed opposite each other along the second direction Y, and the third surface 1123 and the fourth surface 1124 are disposed opposite each other along the first direction X.

[0052] The first surface 1121 and the second surface 1122 are formed in a one-to-one correspondence on two opposing side walls of the main housing 1101, and are both located on the side of the corresponding side wall away from the accommodating cavity 111. The third surface 1123 and the fourth surface 1124 are formed in a one-to-one correspondence on the other two opposing side walls of the main housing 1101, and are both located on the side of the corresponding side wall away from the accommodating cavity 111. In addition, the first surface 1121 and the second surface 1122 both extend along the first direction X and are perpendicular to the second direction Y. The third surface 1123 and the fourth surface 1124 both extend along the second direction Y and are perpendicular to the first direction X.

[0053] In some embodiments, the first surface 1121, the third surface 1123, the second surface 1122, and the fourth surface 1124 are sequentially connected end to end. The bottom surface 1125 can be formed on the bottom plate of the main housing 1101 opposite the opening 11011 and located on the side of the bottom plate away from the accommodating cavity 111. The bottom surface 1125 is simultaneously connected to the first surface 1121, the second surface 1122, the third surface 1123, and the fourth surface 1124. The top surface 1126 is the side surface of the top cover 1102 away from the accommodating cavity 111.

[0054] As shown in Figures 1 to 3, in some embodiments, the insulating layer 200 can be applied to the outer surface 112 of the shell 110 by a spraying process, that is, it includes a first surface 1121, a second surface 1122, a third surface 1123, a fourth surface 1124, a bottom surface 1125 and a top surface 1126.

[0055] In some embodiments, the insulating layer 200 may be provided only on the first surface 1121 , the second surface 1122 , the third surface 1123 , and the fourth surface 1124 , and the bottom surface 1125 and the top surface 1126 may be provided according to product requirements.

[0056] In some embodiments, when spraying the insulating layer 200, a high-precision inkjet printhead can be used to evenly spray ultraviolet light-curing glue (UV glue) onto the outer surface 112 of the housing 110. Simultaneously, a low-power UV lamp can be used to pre-cure the UV glue as the high-precision inkjet printhead moves, preventing the UV glue from dripping. After spraying is complete, a relatively high-power UV lamp can be used to reinforce and cure the entire sprayed UV glue, thereby forming a stable insulating layer 200 on the outer surface 112 of the housing 110 and providing insulation protection.

[0057] In some embodiments, the insulating layer 200 may also be applied to the outer surface 112 of the housing 110 by a coating or other process.

[0058] In some embodiments, the insulating layer 200 and the isolation coating 300 are made of the same material, and the isolation coating 300 is sprayed at the same time as the insulating layer 200 . The insulating layer 200 and the isolation coating 300 are integrally provided.

[0059] In some embodiments, the insulating layer 200 may also be made of an inorganic insulating material. Accordingly, the insulating layer 200 may also be formed on the outer surface 112 of the housing 110 by a process such as evaporation.

[0060] In some embodiments, the insulating layer 200 is a polymer insulating film layer, which is attached to the outer surface 112 of the housing 110 by bonding.

[0061] 4 , in some embodiments, the housing 110 further includes at least one functional area 11021 , and the insulating layer 200 defines at least one avoidance hole 201 . The projection of the at least one functional area 11021 on the insulating layer 200 falls within the at least one avoidance hole 201 in a one-to-one correspondence.

[0062] In some embodiments, the single cell 1000 further includes a first electrode 121, a second electrode 122, an explosion-proof valve 123, and a label 124. The first electrode 121, the second electrode 122, the explosion-proof valve 123, and the label 124 are all disposed on the top cover 1102. The areas where the first electrode 121, the second electrode 122, the explosion-proof valve 123, and the label 124 are located can each serve as a functional area 11021. It is understood that the insulating layer 200 has corresponding avoidance holes 201 at locations corresponding to the first electrode 121, the second electrode 122, the explosion-proof valve 123, and the label 124. The projections of the functional areas 11021 on the insulating layer 200 fall within the corresponding avoidance holes 201.

[0063] In some embodiments, it is not excluded that one, six, or eight functional areas 11021 are provided on the housing 110. Correspondingly, an equal number of avoidance holes 201 may be provided on the insulating layer 200, and the holes 201 are provided in a one-to-one correspondence with the functional areas 11021.

[0064] In some embodiments, the distance between the edge of the functional area 11021 and the opposite side of the avoidance hole 201 in which it is located is M, where 0.5 mm ≤ M ≤ 3 mm. In some embodiments, a suitable gap is left between the functional area 11021 and the insulation layer 200 to ensure that the insulation layer 200 provides effective insulation protection while preventing contamination of the functional area 11021 by UV adhesive during the manufacturing process of the insulation layer 200.

[0065] In some embodiments, the distance M between the edge of the functional area 11021 and the relative side of the avoidance hole 201 in which it is located can be set to any value among 0.5mm, 0.78mm, 0.95mm, 1.05mm, 1.2mm, 1.34mm, 1.5mm, 1.86mm, 2.1mm, 2.35mm, 2.6mm, 2.84mm, 3mm, or a range consisting of any two of them.

[0066] In some embodiments, the distance M between the edge of the functional area 11021 and the opposite side of the avoidance hole 201 in which it is located can be set to 0.5 mm to 1.5 mm. This can prevent a large gap between the functional area 11021 and the insulating layer 200, which could cause insulation failure. Furthermore, it can prevent contamination of the functional area 11021 by UV adhesive due to a small gap between the functional area 11021 and the insulating layer 200.

[0067] As shown in Figures 3 and 4, in some embodiments, the first surface 1121 and the second surface 1122 may be relatively large surfaces in the housing 110. Accordingly, the surface area of ​​the first surface 1121 and the surface area of ​​the second surface 1122 are both larger than the surface area of ​​the third surface 1123 or the surface area of ​​the fourth surface 1124. In some embodiments, the isolation coating 300 may be disposed on the first surface 1121 and the second surface 1122.

[0068] In some embodiments, the isolation coating 300 may also be disposed on the third surface 1123 and / or the fourth surface 1124. Alternatively, the isolation coating 300 may be disposed on the first surface 1121, the second surface 1122, the third surface 1123, and the fourth surface 1124.

[0069] In some embodiments, the isolation coating 300 at the first surface 1121 and the isolation coating 300 at the second surface 1122 may have the same structure, which will be described in detail below using the isolation coating 300 at the first surface 1121 as an example.

[0070] 5 , in some embodiments, the first surface 1121 is rectangular. The isolation coating 300 may also be configured as a rectangular ring structure and disposed along the four sides of the first surface 1121. The hollow region 301 may be formed on a side of the isolation coating 300 away from the edge of the first surface 1121.

[0071] In some embodiments, the isolation coating 300 may be configured as a circular ring, an elliptical ring, or a convex polygonal ring structure such as a square ring structure, a pentagonal ring structure, or a concave polygonal ring structure such as a pentagram ring structure.

[0072] In some embodiments, the isolation coating 300 is disposed around the edge of the outer surface 112. The minimum distance between the isolation coating 300 and the corresponding edge of the first surface 1121 is L, where 0.01 mm ≤ L ≤ 10 mm.

[0073] In some embodiments, the first surface 1121 includes a first side 11211, a second side 11212, a third side 11213, and a fourth side 11214. The barrier coating 300 includes a first structural segment 310 opposite the first side 11211, a second structural segment 320 opposite the second side 11212, a third structural segment 330 opposite the third side 11213, and a fourth structural segment 340 opposite the fourth side 11214. The minimum distance L between the barrier coating 300 and corresponding edges of the first surface 1121 may refer to the minimum vertical distance between the side of each structural segment away from the hollow region 301 and the corresponding side edge. In some embodiments, the vertical distance between each circumferential portion of the barrier coating 300 and the corresponding side edge may be set to be consistent.

[0074] It is understood that the edge of the first surface 1121 is generally thicker than the center of the first surface 1121, thereby having better deformation resistance. In some embodiments, the isolation coating 300 is disposed near the edge of the first surface 1121, so that the first surface 1121 can provide more reliable support for the isolation coating 300.

[0075] In some embodiments, the minimum distance L between the isolation coating 300 and the corresponding edge of the first surface 1121 can be set to 0.01 mm, 0.15 mm, 1.2 mm, 2 mm, 2.1 mm, 2.6 mm, 3.5 mm, 4.2 mm, 5 mm, 5.6 mm, 6.7 mm, 7.2 mm, 8.2 mm, 9.5 mm, 10 mm, or any value from 0.01 mm to 10 mm, or a range consisting of any two of them.

[0076] In some embodiments, the minimum distance L between the isolation coating 300 and the corresponding edge of the first surface 1121 is, where 2 mm ≤ L ≤ 5 mm. This can prevent the minimum distance L between the isolation coating 300 and the corresponding edge from being too small, which could result in the isolation coating 300 being sprayed onto the R corner of the corresponding edge during processing. This could lead to a lack of effective support for the corresponding portion of the isolation coating 300, an inability to effectively isolate the substrate, and material waste. Furthermore, this can prevent the minimum distance L between the isolation coating 300 and the corresponding edge from being too large, which could result in the hollowed-out area 301 being too small, thus failing to provide sufficient expansion space for the battery cells 1000.

[0077] As shown in Figure 5, in some embodiments, the isolation coating 300 has a minimum distance N between the side proximal to the hollow region 301 and the side distal to the hollow region 301, with a value of 2 mm ≤ N ≤ 10 mm. The minimum distance N between the side proximal to the hollow region 301 and the side distal to the hollow region 301 refers to the vertical distance between the inner wall of the isolation coating 300 proximal to the hollow region 301 and the outer wall of the isolation coating 300 distal to the hollow region 301, i.e., the width of the isolation coating 300. In some embodiments, the width of each circumferential portion of the isolation coating 300 can be set to be uniform.

[0078] In some embodiments, the minimum distance N between the side of the isolation coating 300 close to the hollow area 301 and the side away from the hollow area 301 can be set to 2 mm, 2.5 mm, 3 mm, 3.2 mm, 3.6 mm, 4.1 mm, 4.5 mm, 5.3 mm, 6 mm, 6.2 mm, 6.7 mm, 7.5 mm, 8 mm, 8.6 mm, 9.2 mm, 9.7 mm, 10 mm, or any value between 2 mm and 10 mm, or a range consisting of any two of them.

[0079] In some embodiments, to avoid the isolation coating 300 being too wide, which would result in the hollow region 301 being too small and thus providing insufficient space for the expansion of the single cell 1000, and to avoid the isolation coating 300 being too narrow, which would adversely affect the stress on the isolation coating 300 during the expansion of the single cell 1000, in some embodiments, the minimum distance N between the side of the isolation coating 300 proximal to the hollow region 301 and the side distal to the hollow region 301 can be set to 3 mm ≤ N ≤ 6 mm.

[0080] As shown in FIG4 , in some embodiments, a minimum distance H is defined between the surface of the isolation coating 300 facing away from the insulating layer 200 and the insulating layer 200, where 0.1 mm ≤ H ≤ 1 mm. In some embodiments, the minimum distance H between the surface of the isolation coating 300 facing away from the insulating layer 200 and the insulating layer 200 is the vertical distance between the surface of the isolation coating 300 facing away from the insulating layer 200 and the insulating layer 200, i.e., the thickness of the isolation coating 300. In some embodiments, the thickness of the isolation coating 300 can be uniform across all portions of the isolation coating 300.

[0081] In some embodiments, the minimum distance H between the surface of the isolation coating 300 on one side away from the insulating layer 200 and the insulating layer 200 can be set to 0.1 mm, 0.15 mm, 0.2 mm, 0.23 mm, 0.32 mm, 0.35 mm, 0.42 mm, 0.48 mm, 0.5 mm, 0.54 mm, 0.56 mm, 0.6 mm, 0.65 mm, 0.69 mm, 0.72 mm, 0.76 mm, 0.85 mm, 0.92 mm, 0.98 mm, 1 mm, or any value from 0.1 mm to 1 mm, or a range consisting of any two of them.

[0082] In some embodiments, if the thickness of the isolation coating 300 is too thin, the expansion space between adjacent cells 1000 will be too small, which is not conducive to the expansion of the cells 1000 during subsequent use. If the thickness of the isolation coating 300 is too thick, it will affect the space utilization of the entire battery pack and cause space waste. In some embodiments, the minimum distance H between the surface of the isolation coating 300 facing away from the insulating layer 200 and the insulating layer 200 can be set to 0.2mm≤H≤0.6mm.

[0083] In some embodiments, the isolation coating 300 can be made on the side of the insulating layer 200 away from the shell 110 by a spraying process. Specifically, the UV glue can be evenly sprayed on the production position of the isolation coating 300 by a high-precision inkjet printing nozzle according to the set program. At the same time, a low-power ultraviolet lamp follows the movement of the high-precision inkjet printing nozzle to pre-cure the UV glue to prevent the UV glue from sagging. It is understandable that the UV glue can be sprayed and pre-cured layer by layer until the required thickness of the isolation coating 300 is reached. After the isolation coating 300 is sprayed, the sprayed UV glue can be reinforced and cured as a whole by a relatively high-power ultraviolet lamp to form a stable isolation coating 300 on the side of the insulating layer 200 away from the shell 110. In the process of curing the isolation coating 300, the isolation coating 300 can form a molecular chain connection with the insulating layer 200, which can enhance the bonding force between the isolation coating 300 and the insulating layer 200. At the same time, the isolation coating 300 and the insulation layer 200 are made of the same material and have similar compatibility, which further enhances the bonding strength between the isolation coating 300 and the insulation layer 200 .

[0084] In some embodiments, the isolation coating 300 may also be applied to the outer surface 112 of the housing 110 by a coating or application process.

[0085] As shown in Figures 3 and 4, it is understood that the single battery 1000 further includes a bare cell 130, which is disposed in the accommodating cavity 111 of the housing 110. In addition, the bare cell is electrically connected to the first electrode 121 and the second electrode 122, respectively.

[0086] In some embodiments, when the single cells 1000 are used in a battery pack, two adjacent single cells 1000 can be connected by the isolation coating 300. Accordingly, the hollow area 301 of the isolation coating 300 can provide a gap between the two single cells 1000, thereby forming an expansion space to prevent the explosion-proof valve 123 from being opened due to excessive pressure inside the single cells 1000.

[0087] In some embodiments, a battery pack is also provided, comprising the single cells 1000 provided in multiple embodiments. In some embodiments, the multiple single cells 1000 may be arranged sequentially along the second direction Y. Furthermore, any two adjacent single cells 1000 are connected by an isolation coating 300, and a hollow region 301 may be formed between the two adjacent single cells 1000 to provide expansion space. Specifically, the hollow region 301 creates a gap between any two adjacent single cells.

[0088] In some embodiments, the plurality of unit cells 1000 may be distributed in an array, and any two adjacent unit cells 1000 may be connected via the isolation coating 300 . The hollow area 301 allows a gap to exist between any two adjacent unit cells.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0090] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Industrial Applicability

[0091] The present application provides a single cell and a battery pack, in which an insulating chemical coating is directly applied to the side of the insulating layer away from the shell by spraying, coating or applying, and an isolation coating that can be directly contacted and connected with the insulating layer is provided, thereby improving the bonding strength between the isolation coating and the insulating layer and reducing the risk of displacement and falling off of the isolation coating relative to the insulating layer; and by forming a hollow area, a gap is provided between any two adjacent single cells, ensuring that an effective and reliable expansion space is provided for the expansion of the single cell during subsequent recycling use, and at the same time, the service life of the isolation coating can also be extended.

Claims

1. A single cell battery, comprising: A housing (110) having a receiving cavity (111) and an outer surface (112); An insulating layer (200) is disposed on the outer surface (112) of the housing (110); The isolation coating (300) is disposed on a side of the insulating layer (200) away from the housing (110), and the isolation coating (300) has a hollow area (301).

2. The single cell according to claim 1, wherein: The insulating layer (200) is an insulating coating.

3. The single cell according to claim 1, wherein: The insulating layer (200) is an inorganic insulating material layer or a polymer insulating film layer.

4. The single cell according to claim 1, wherein: The insulating layer (200) and the isolation coating (300) are made of the same material.

5. The single cell according to claim 1, wherein: The insulating layer (200) and the isolation coating (300) are integrally arranged.

6. The single cell according to claim 1, wherein: The isolation coating (300) is protrudingly disposed on a side of the insulation layer (200) away from the housing (110).

7. The single cell according to claim 2, wherein: The single cell has a first direction (X) and a second direction (Y) intersecting each other; The outer surface (112) comprises a first surface (1121) and a second surface (1122) arranged opposite to each other along a second direction (Y), a third surface (1123) and a fourth surface (1124) arranged opposite to each other along a first direction (X), and a bottom surface (1125), wherein the first surface (1121) and the second surface (1122) are connected to the third surface (1123) and the fourth surface (1124) respectively, and the bottom surface (1125) is connected to the first surface (1121), the second surface (1122), the third surface (1123) and the fourth surface (1124) respectively to enclose the accommodating cavity (111), wherein the surface area of ​​the first surface (1121) and the surface area of ​​the second surface (1122) are both greater than the surface area of ​​the third surface (1123) or the surface area of ​​the fourth surface (1124); The first surface (1121) and the second surface (1122) are provided with the insulating layer (200) and the isolation coating (300).

8. The single cell according to claim 7, wherein: The insulating layer (200) is only disposed on the first surface (1121), the second surface (1122), the third surface (1123) and the fourth surface (1124).

9. The single cell according to claim 7, wherein: The first direction (X) is parallel to the length direction of the single battery, and the second direction (Y) is parallel to the thickness direction of the single battery.

10. The single cell according to claim 1, wherein: The housing (110) comprises a main housing (1101) and a top cover (1102), wherein the main housing (1101) is a structure having an opening (11011) at one end, and the accommodating cavity (111) is formed in the main housing (1101).

11. The single cell according to claim 10, wherein: The top cover (1102) is fixedly connected to the opening (11011) of the main shell (1101) and closes the opening (11011).

12. The single cell according to claim 10, wherein: The outer surface (112) includes a surface of the main shell (1101) away from the side of the accommodating cavity (111) and a surface of the top cover (1102) away from the side of the accommodating cavity (111).

13. The single cell according to claim 10, further comprising a first electrode (121), a second electrode (122), an explosion-proof valve (123) and a label (124), wherein: The first electrode (121), the second electrode (122), the explosion-proof valve (123) and the label (124) are all arranged on the top cover (1102).

14. The single cell according to claim 13, wherein: The areas where the first electrode (121), the second electrode (122), the explosion-proof valve (123) and the label (124) are located are all functional areas (11021); corresponding avoidance holes (201) are provided at positions of the insulating layer (200) corresponding to the first electrode (121), the second electrode (122), the explosion-proof valve (123) and the label (124); and projections of the functional areas (11021) on the insulating layer (200) fall one-to-one in the corresponding avoidance holes (201).

15. The single cell according to claim 13, further comprising a bare cell (130) disposed in the accommodating cavity (111), wherein the bare cell (130) is electrically connected to the first electrode (121) and the second electrode (122).

16. The single cell according to claim 1, wherein: The isolation coating (300) is an annular or polygonal annular structure, and the annular or polygonal annular structure surrounds the hollow area (301).

17. The single cell according to claim 16, wherein: The barrier coating (300) is disposed around the edge of the outer surface (112).

18. The single cell according to any one of claims 1 to 17, wherein: The minimum distance between the isolation coating (300) and the edge of the outer surface (112) is L, 0.01 mm ≤ L ≤ 10 mm, and / or, The isolation coating (300) has a minimum distance N between a side close to the hollow area (301) and a side away from the hollow area (301), wherein 2 mm ≤ N ≤ 10 mm.

19. The single cell according to claim 1, wherein: A minimum distance H is provided between the surface of the isolation coating (300) on one side away from the insulating layer (200) and the insulating layer (200), wherein 0.1 mm ≤ H ≤ 1 mm, and / or, The shell (110) further comprises at least one functional area (11021), the insulating layer (200) is provided with at least one avoidance hole (201), and the projection of the at least one functional area (11021) on the insulating layer (200) falls in the at least one avoidance hole (201) in a one-to-one correspondence; The distance between the edge of the functional area (11021) and the opposite side edge of the avoidance hole (201) where it is located is M, wherein 0.5 mm ≤ M ≤ 3 mm.

20. A battery pack comprising a plurality of single cells according to any one of claims 1 to 19, wherein: The plurality of single cells are arranged in sequence or distributed in an array, any two adjacent single cells are connected via the isolation coating (300), and the hollow area (301) allows a gap to exist between any two adjacent single cells.

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