Battery, battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery, a battery device and electric equipment, the battery comprises a battery shell, the surface of the battery shell is provided with an insulating coating, at least part of the surface of the battery shell is provided with a single-layer insulating coating, and the average size of units in the single-layer insulating coating is 1mm < 2 >-10mm < 2 >.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and more particularly, to a battery, a battery device, and an electrical device. Background Art

[0002] In electric vehicles, a battery device is often provided, and the battery device is used to provide power for the electric vehicle. The battery device may include a box body and a plurality of batteries, and the plurality of batteries are arranged in sequence in the box body. In the use process, in order to prevent risks such as short circuits, it is necessary to insulate between the plurality of batteries. In the related art, the insulation between the batteries is achieved by covering an insulating blue film on the surface of the battery. The insulating blue film is easily broken down during use, resulting in poor safety of the battery.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a battery, a battery device, and an electrical device, thereby at least to a certain extent improving the safety of the battery.

[0005] According to the first aspect of the present disclosure, there is provided a battery, the battery comprising:

[0006] a battery housing, an insulating coating is provided on the surface of the battery housing, and at least a part of the surface of the battery housing has a single-layer insulating coating, and the average size of the units in the single-layer insulating coating is 1 mm 2 -10 mm 2 .

[0007] According to the second aspect of the present disclosure, there is provided a battery device, the battery device comprising the above battery.

[0008] According to the third aspect of the present disclosure, there is provided an electrical device, the electrical device comprising the above battery device.

[0009] The battery provided by the embodiments of the present disclosure includes a battery housing. By providing an insulating coating on the battery housing, the problem of poor safety caused by the easy breakdown of the insulating blue film used for insulation on the surface of the battery in the related art is solved, and the safety of the battery is improved. And at least a part of the surface of the housing has a single-layer insulating coating, and the single-layer insulating coating avoids the problem of poor bonding of the interlayer interface existing in the multi-layer coating. Further, the average size of the units of the single-layer insulating coating is 1 mm 2 -10 mm 2, on the one hand, it avoids the problem that the average unit size is too small, which leads to too high coating viscosity, is not conducive to the spreading of the coating, causes poor appearance, obvious particle feeling on the coating surface, and more seriously, leads to discontinuous coating coverage and local substrate exposure, thus improving the quality and insulation performance of the insulating coating. On the other hand, it avoids the problem that the average unit size is too large, resulting in too low coating viscosity, easy sagging, and too thin single-layer coating.

[0010] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0012] Figure 1 Schematic diagram of the structure of a battery provided for an exemplary embodiment of the present disclosure;

[0013] Figure 2 Schematic diagram of an insulating coating provided for an exemplary embodiment of the present disclosure;

[0014] Figure 3 Three-dimensional morphology diagram of an insulating coating provided for an exemplary embodiment of the present disclosure;

[0015] Figure 4 Morphology schematic diagram of an insulating coating provided for an exemplary embodiment of the present disclosure;

[0016] Figure 5 Schematic diagram of the structure of another battery provided for an exemplary embodiment of the present disclosure.

[0017] 10. Battery housing; 11. First end wall; 12. Second end wall; 13. Side wall; 131. First side wall; 132. Second side wall; 20. Insulating coating; 21. Coating unit; 30. Terminal assembly; 40. Battery cell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The described exemplary embodiments herein are only for the purpose of illustration and are not intended to limit the protection scope of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the protection scope of the present disclosure.

[0019] In the description of the present disclosure, unless otherwise clearly specified and defined, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and / or" includes any combination and all combinations of one or more of the associated listed items. In particular, referring to "the / a" object is also intended to mean one of the possible plurality of such objects.

[0020] Unless otherwise specified or stated, terms such as "connected" and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0021] Furthermore, in the description of the present disclosure, it should be understood that the orientation terms such as "upper", "lower", "inner", and "outer" described in the exemplary embodiments of the present disclosure are described from the angles shown in the drawings and should not be construed as limiting the exemplary embodiments of the present disclosure. It should also be understood that in the context, when referring to an element or feature being connected "on", "under", or "inside", "outside" another element(s), it can not only be directly connected "on", "under", or "inside", "outside" another element(s), but also be indirectly connected "on", "under", or "inside", "outside" another element(s) through an intermediate element.

[0022] The exemplary embodiments of the present disclosure provide a battery, such as Figure 1 and Figure 2 shown, the battery includes a battery housing 10, an insulating coating 20 is provided on the surface of the battery housing 10, and at least part of the surface area of the battery housing 10 has a single-layer insulating coating, and the average unit size of the single-layer insulating coating is 1 mm 2 -10 mm 2 .

[0023] The battery provided by the embodiments of the present disclosure includes a battery housing 10. By providing an insulating coating 20 on the battery housing 10, the problem of poor safety caused by the easy breakdown of the insulating blue film for insulation on the battery surface in the related art is solved, and the safety of the battery is improved. And at least part of the surface area of the housing has a single-layer insulating coating, and the single-layer insulating coating avoids the problem of poor interfacial bonding between layers existing in the multi-layer coating. Further, the average unit size in the single-layer insulating coating is 1 mm 2 -10 mm 2, on the one hand, it avoids the problem that the average unit size is too small, which results in too high viscosity of the coating, is not conducive to the spreading of the coating, causes poor appearance, obvious particle feeling on the coating surface, and more seriously, leads to discontinuous coating coverage and local substrate exposure, improving the quality and insulation performance of the insulation coating 20. On the other hand, it avoids the problem that the average unit size is too large, which results in too low viscosity of the coating, prone to sagging, and too thin single-layer coating.

[0024] Furthermore, the battery provided by the embodiment of the present disclosure may further include a battery cell 40 and a terminal assembly 30. There is an accommodation space inside the battery housing 10. The battery cell 40 is disposed in the accommodation space inside the housing, and the terminal assembly 30 is disposed on the battery housing 10 and is connected to the battery cell 40.

[0025] The following will detail each part of the battery provided by the embodiment of the present disclosure:

[0026] The battery housing 10 is used to form the outer contour of the battery and protect the battery cell 40, electrolyte, adapter, etc. inside the battery. The battery housing 10 may be an aluminum housing or a stainless steel housing, etc.

[0027] The battery housing 10 may include a first end wall 11, a second end wall 12, and a side wall 13. The side wall 13 is in a cylindrical structure, and the first end wall 11 and the second end wall 12 are respectively disposed at both ends of the side wall 13. The first end wall 11 and the side wall 13 may be an integrally formed structure or a separately formed structure, and the second end wall 12 and the side wall 13 may be an integrally formed structure or a separately formed structure.

[0028] The insulation coating 20 may be formed on the surface of the battery housing through processes such as spraying, coating, electrophoresis, etc. The average unit size in a single-layer insulation coating is 1 mm 2 -10 mm 2 . For example, the average unit size may be 1 mm 2 , 1.5 mm 2 , 2 mm 2 , 3 mm 2 , 3.3 mm 2 , 4 mm 2 , 5 mm 2 , 7 mm 2 , 8 mm 2 , 9.9 mm 2 or 10 mm 2 etc. Furthermore, the average unit size in a single-layer coating may be 1.5 mm 2 -8 mm 2 .

[0029] The average cell depth of the insulating coating 20 is 2 μm - 50 μm. For example, the average cell depth of the insulating coating 20 can be 2 μm, 3 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc.

[0030] Within an area of 15 mm × 15 mm in a single-layer insulating coating, the number of cells of the insulating coating 20 is 10 - 100. The number of cells represents the number of cells into which the test area is divided. Setting the number of cells of the insulating coating 20 to 10 - 100, on the one hand, avoids the problem that when the value of the number of cells is too large, the average cell size of a single cell is too small, resulting in high paint viscosity, difficult paint leveling, and serious surface particle problems. On the other hand, it avoids the problem that when the value of the number of cells is too small, the paint viscosity is low, resulting in poor paint coverage and poor insulation performance in the single-layer insulating coating area.

[0031] Among them, the average cell size refers to the selected area on the surface of the insulating coating 20, collecting three-dimensional topography data for it, obtaining an image within the corresponding area from the topography acquisition data, and dividing the area into multiple cells by connecting the height vertices in the three-dimensional topography. The area of each cell is the cell size, and the average value of all cell sizes within the selected area is the average cell size. The cell depth refers to the height difference between the maximum amplitude and the minimum amplitude of each coating cell in the three-dimensional topography of the surface of the insulating coating 20, and the average cell depth is the average value of all cell depths within the selected area.

[0032] In the embodiments of the present disclosure, the average cell size, the average cell depth, and the number of cells can be obtained by the following method: Using BYK (BYK-Chemie GmbH) spectro2profiler, calculated by the rough coating algorithm. During the test, select an area of 15 mm × 15 mm as the test area for three-dimensional topography characterization. According to the three-dimensional topography, connect the height vertices in the three-dimensional topography to divide the corresponding area into multiple coating cells 21. The area of the coating cell 21 is the cell size, and the average value of the sizes of multiple coating cells 21 is the average cell size. The cell depth is the height difference between the maximum amplitude and the minimum amplitude of each coating cell 21, and the average cell depth is the average value of all cell depths.

[0033] See Figure 3 , using the three-dimensional topography map obtained by BYK spectro2profiler, in the three-dimensional topography map, find the height vertices and connect them to determine the coating cells in the coating. See Figure 4 , the cell depth is the height difference between the maximum amplitude and the minimum amplitude in each coating cell.

[0034] It should be noted that the average unit size of the insulating coating 20 provided in the embodiments of the present disclosure is mainly adjusted through the coating formulation. In some embodiments, the coating formulation includes a photosensitive resin, and the average unit size can be adjusted by adjusting the type of the photosensitive resin. For example, the average unit size can be adjusted by adjusting the ratio of high molecular weight polyurethane acrylate and TPGDA monomer, where the molecular weight range of the polyurethane acrylate is controlled at 10,000 - 50,000.

[0035] It can be understood that when there are multiple layers of regions on the battery housing 10 with the insulating coating 20, the average unit size in the multi-layer insulating coating can be the same as that in the single-layer insulating coating. That is, the average unit size in the multi-layer insulating coating is 1 mm 2 - 10 mm 2 . Of course, in actual applications, the average unit size in the multi-layer insulating coating can also be different from that in the single-layer insulating coating, and the embodiments of the present disclosure are not limited thereto.

[0036] There are multiple layers of coating regions provided on the battery housing, and multiple layers of insulating coatings are provided in the multiple layers of coating regions. The thickness of the outermost single-layer insulating coating in the multiple layers of insulating coatings is 10 μm - 60 μm, and the average unit size of the outermost single-layer insulating coating is 2 mm 2 - 10 mm 2 . When there are multiple layers of insulating coatings on the battery housing, by setting the thickness of the outermost single-layer insulating coating in the multiple layers of insulating coatings to 10 μm - 60 μm, while achieving the insulating effect of the inner insulating coating, it is possible to avoid the outermost insulating coating being too thick. And by setting the average unit size of the outermost insulating coating to 2 mm 2 - 10 mm 2 , the flatness of the battery surface can be increased.

[0037] It should be noted that in the embodiments of the present disclosure, the single-layer insulating coating refers to the insulating coating 20 formed on the surface of the battery housing 10 through one-time spraying. The multi-layer insulating coating refers to the insulating coating 20 formed on the surface of the battery housing 10 through at least two times of spraying. In the multi-layer insulating coating, the adjacent insulating coatings 20 are connected to each other and have a connection interface.

[0038] The thickness of the single-layer insulating coating is h, and the average unit size is Cs, and 5 ≤ h / Cs ≤ 80. By comprehensively adjusting the relationship between the average unit size and the thickness of the single-layer insulating coating, when the required thickness of the single-layer insulating coating is relatively large, the average unit size cannot be too small. If it is too small, the coating is prone to leveling, and a single-layer insulating coating with the required thickness cannot be achieved; the average unit size cannot be too small either. If it is too small, the coating cannot spread out, resulting in too large a thickness in some areas and too small a thickness in some areas of the coating, and the flatness of the coating surface is poor. By 5 ≤ h / Cs ≤ 80, the above problems are solved.

[0039] When h is greater than or equal to 80 μm, 2 mm 2 ≤ Cs ≤ 5 mm². When the thickness of the single-layer insulating coating is relatively large, Cs cannot be too small. If it is too small, the coating cannot spread out, and the coating thickness in some areas is too thick, resulting in poor flatness of the coating; nor can it be too small. If it is too small, it is easy to level, and it is difficult to reach the required thickness of the insulating coating. By setting Cs to 2 mm when h is greater than or equal to 80 μm 2 - ≤ 5 mm 2 The above problems are solved.

[0040] In a feasible embodiment of the present disclosure, the battery housing 10 includes a first end wall 11 and a side wall 13. The first end wall 11 and the side wall 13 are connected, and the first end wall 11 and the side wall 13 are integrally formed. A first transition portion is formed between the first end wall 11 and the side wall 13, and the first transition portion is coated with a single-layer insulating layer. The first transition portion is easily impacted or knocked during battery transportation or use. Setting the first transition portion as a single layer can improve the safety of the battery (there is no interlayer interface in the single-layer insulating coating, so the ability to resist impact and vibration is strong).

[0041] Optionally, the minimum thickness of the insulating coating 20 at the first transition portion is h1, and the thickness of the insulating coating 20 at the side wall 13 is h2. When h1 / h2 > 0.5, 2 mm 2 ≤ Cs ≤ 8 mm 2 . The paint is prone to sag at the transition portion, but this position is easily knocked. The thickness of the insulating coating cannot be too thin. Therefore, Cs of the side wall 13 is not too large. When Cs is too large, the coating thickness attached to the transition portion is too thin; at the same time, Cs of the side wall 13 cannot be too small either. When Cs is too small, the paint cannot spread out, resulting in too large a thickness of the insulating coating at a local position of the transition portion. The heat at the transition portion cannot be dissipated in time, and it may also cause some positions of the transition portion not to be covered by the insulating coating, and the risk of insulation failure is high. When the ratio of h1 to h2 is set to be greater than or equal to 0.5, the average size range of the control unit satisfies 2 mm 2 ≤ Cs ≤ 8 mm 2 The risk of insulation failure at the first transition portion is reduced.

[0042] For example, the thickness of the insulating coating 20 at the first transition portion is 70 μm - 300 μm. The thickness of the insulating coating 20 at the first transition portion is 70 μm - 300 μm, which avoids the problem of easy heat concentration at the first transition portion due to too large a thickness.

[0043] The radius of the first transition portion is R, and the unit average size of the insulating coating at the side wall is Cs1, where 0.05 ≤ R / Cs1 ≤ 5. The radius R of the first transition portion and Cs1 need to satisfy 0.05 ≤ R / Cs1 ≤ 5; when R is relatively small, the risk of paint sagging increases. When R is small, it is necessary to control Cs1 of the side wall so that it is not too large to avoid the insulating coating at the transition portion being too thin and increasing the risk of insulation failure; in addition, Cs1 cannot be too small either, otherwise the paint cannot spread out, and it is more difficult to form a coating at the position of the first transition portion.

[0044] In another feasible embodiment of the present disclosure, the battery housing 10 may include a first end wall 11, a side wall 13, and a second end wall 12. The first end wall 11 and the side wall 13 are integrally formed, and the second end wall 12 is sealed at one end of the side wall away from the first end wall. A second transition portion is formed between the second end wall 12 and the side wall 13, and a multi-layer insulating coating is applied at the second transition portion.

[0045] The terminal assembly 30 is provided on the second end wall 12. The terminal assembly 30 is connected to the battery cell 40, and the terminal assembly 30 serves as an output terminal of the battery. For example, the terminal assembly 30 may include a column body, a first connection portion, and a second connection portion. An installation hole is provided on the second end wall 12, the column body passes through the installation hole, the first connection portion is connected to one end of the column body close to the battery cell 40, and the first connection portion is connected to the battery cell 40; the second connection portion is connected to the end of the column body away from the battery cell 40, and the second connection portion is used to connect to an external conductive member (such as a bus bar, etc.).

[0046] In one embodiment, as Figure 5 shown, the battery is a rectangular prism battery (square battery). The side wall 13 includes a first side wall 131 and a second side wall 132. The area of the first side wall 131 is larger than that of the second side wall 132. A single-layer insulating coating is provided on the first side wall. The wall thickness of the first side wall is W, where 0.3 ≤ W1×Cs ≤ 8. During the charging and discharging process of the battery, it will expand. When the first side wall 131 is relatively thin, the risk of the first side wall 131 being deformed by expansion increases. When the first side wall 131 is deformed by force, the single-layer insulating coating on the surface of the first side wall 131 will also be affected by the expansion force. When Cs is too small, the paint in a local area cannot spread out, and the area where it does not spread out has a too thick coating, increasing the risk of the coating cracking caused by the force on the housing. Therefore, when a single-layer insulating coating is provided on the first side wall 131 and the wall is relatively thin, the unit average size cannot be too small. When the first side wall is relatively thick, the risk of the housing being deformed by force is small, and the unit average size can be set smaller. Therefore, W1×Cs is set to 0.3 - 8.

[0047] When the area of the first side wall 131 is larger than that of the second side wall 132, during the charge and discharge process of the battery, the expansion of the first side wall 131 is larger than that of the second side wall 132. Since the expansion of the first side wall is large, it is preferably to set the insulating coating on the first side wall as a single-layer insulating coating.

[0048] For example, the average unit size at the first side wall 131 is 2 mm 2 -5 mm 2 , and the average unit depth at the first side wall 131 is < 10 μm. The side wall 13 may include two first side walls 131 and two second side walls 132, and the two first side walls 131 are arranged oppositely, and the two second side walls 132 are arranged oppositely.

[0049] When the prismatic batteries are grouped, multiple batteries are arranged in sequence, and the first side walls 131 of two adjacent batteries are arranged oppositely. That is, the first side wall 131 is the surface that faces each other when the batteries are stacked. The average unit size at the first side wall 131 is set to 2 mm 2 -5 mm 2 , and the average unit depth at the first side wall 131 is set to < 10 μm. On the one hand, it can ensure the roughness of the insulating coating 20, which helps to improve the bonding strength when the batteries are bonded and fixed to each other. On the other hand, it also avoids the problem of poor flatness of the outer surface of the battery caused by too small average unit size.

[0050] The thickness of the insulating coating 20 on the first side wall 131 is 80 μm - 200 μm. In the prismatic battery, the first side wall 131 of the battery housing 10 is subjected to the largest expansion. In order to prevent the expansion of the battery housing 10 from affecting the insulating coating 20, the thickness of the insulating coating 20 on the first side wall 131 is set to 80 μm - 200 μm. On the one hand, it avoids the problem that the coating of the housing is prone to cracking due to too large thickness of the single-layer insulating coating on the first side wall 131, and solves the problem of increased risk of cracking of the single-layer insulating coating caused by the force being transmitted from the inside to the outside in the case of a single-layer coating. On the other hand, it also avoids the problem of poor insulation performance caused by too small thickness of the insulating coating 20.

[0051] Further, the average unit size at the first end wall 11 is 1 mm 2 -8 mm 2 , and the average unit depth at the first end wall 11 is > 8 μm. The first end wall 11 is used for bonding and fixing with the battery box body (it can be directly connected or indirectly connected. For example, a structural adhesive is provided between the battery and the box body to achieve bonding; or the battery is first bonded and fixed to the support member, and the support member is connected to the box body). The average unit size at the first end wall 11 is 1 mm 2 -8 mm 2, the average width-depth of the unit at the first end wall 11 > 8μm, which can ensure the connection stability between the battery and the battery box body.

[0052] When the battery is a prismatic battery, a first pole assembly and a second pole assembly can be arranged on the second end wall 12. The first pole assembly is the positive pole of the battery, and the second pole assembly is the negative pole of the battery. The first pole assembly is connected to the positive tab of the battery cell 40, and the second pole assembly is connected to the negative tab of the battery cell 40.

[0053] In another embodiment, the battery can be a cylindrical battery. On this basis, the first end wall 11 and the second end wall 12 are disc structures, and the wall thickness of the first end wall is W2, 0.5 ≤ W2 × Cs ≤ 15.

[0054] The expansion of the end wall of the cylindrical battery is large. Therefore, a single-layer insulating coating is provided at the end wall, which can prevent the insulating coating at the end wall from cracking when the end wall expands. And 0.5 ≤ W2 × Cs ≤ 15 can further prevent the insulating layer of the first end wall 11 from cracking when expanding.

[0055] When the battery is a cylindrical battery, a pole assembly 30 is arranged on the second end wall 12. The pole assembly 30 serves as one electrode end of the battery, and the other electrode end of the battery is the battery housing 10. For example, the pole assembly 30 is the positive end of the battery. The pole assembly 30 is connected to the positive tab of the battery cell 40, the battery housing 10 is the negative end of the battery, and the battery housing 10 is connected to the negative tab of the battery cell 40.

[0056] The battery cell 40 is arranged in the battery housing 10. The battery cell 40 is connected to the pole, and the battery cell 40 is immersed in the electrolyte. The battery cell 40 includes a battery cell 40 body and tabs. The tabs extend from the battery cell 40 body; there are two tabs on the battery cell 40 body, and the two tabs are the first tab (positive tab) and the second tab (negative tab) respectively. The first tab and the second tab can be respectively connected to the corresponding adapters.

[0057] It should be noted that the battery cell 40 body can include more than two electrode plates, the tabs include more than two single-piece tabs, the single-piece tabs respectively extend from the electrode plates corresponding to them, the width of the single-piece tab is less than the width of the electrode plate, and multiple single-piece tabs are stacked to form the tab.

[0058] In one embodiment, the battery is a stacked battery, which is not only convenient for grouping, but also a battery with a longer length can be obtained by processing. The battery cell 40 is a stacked battery cell 40. The battery cell 40 has a first electrode plate, a second electrode plate with the opposite electrical property to the first electrode plate, and a separator sheet arranged between the first electrode plate and the second electrode plate, so that multiple pairs of the first electrode plate and the second electrode plate are stacked to form the stacked battery cell 40.

[0059] Optionally, the battery cell 40 can be a wound battery cell 40, that is, the first electrode sheet, the second electrode sheet having the opposite electrical property to the first electrode sheet, and the separator sheet disposed between the first electrode sheet and the second electrode sheet are wound to obtain the wound battery cell 40.

[0060] The number of layers of the positive electrode sheet in the battery cell is p, the thickness of a single positive electrode sheet is q, p×q = m, 900 μm / mm 2 ≤m / Cs≤30000 μm / mm 2 . In the battery, the larger the product m of the number of layers and the thickness of the positive electrode sheet, the greater the expansion of the battery. When the expansion is relatively large, if Cs is too small, the risk of coating cracking in the unspread partial area increases. Therefore, m / Cs is set to 900 μm / mm 2 ≤m / Cs≤30000 μm / mm 2 which can reduce the risk of insulation coating cracking, thereby ensuring the insulation performance after the battery expands.

[0061] When the two electrode ends of the single battery cell are the first pole column and the second pole column respectively, the first pole tab is connected to the first pole column through the first adapter, and the second pole tab is connected to the second pole column through the second adapter. When the two electrode ends of the single battery cell are the pole column and the battery case 10 respectively, the first pole tab is connected to the pole column through the first adapter, and the second pole column is connected to the battery case 10 through the second adapter.

[0062] The battery provided by the embodiment of the present disclosure includes a battery case 10. By providing an insulation coating 20 on the battery case 10, the problem of poor safety caused by the easy breakdown of the insulation blue film for insulation on the battery surface in the related art is solved, and the safety of the battery is improved. And at least part of the surface of the case has a single-layer insulation coating, and the single-layer insulation coating avoids the problem of poor interfacial bonding between layers existing in the multi-layer coating. Further, the average unit size in the single-layer insulation coating is 1 mm 2 -10 mm 2 . On the one hand, it avoids the problem that the average unit size is too small, resulting in too high viscosity of the coating, which is not conducive to the spreading of the coating, causing poor appearance, obvious particle feeling on the coating surface, and more seriously, resulting in discontinuous coating coverage and local substrate exposure, improving the quality and insulation performance of the insulation coating 20. On the other hand, it avoids the problem that the average unit size is too large, resulting in too low viscosity of the coating, which is prone to sagging and causing the single-layer coating to be too thin.

[0063] The exemplary embodiment of the present disclosure also provides a battery device. The battery device includes a battery. The battery includes a battery case 10, an insulation coating 20 is provided on the surface of the battery case 10, and at least part of the surface of the case has a single-layer insulation coating, and the average unit size in the single-layer insulation coating is 1 mm 2 -10 mm 2 .

[0064] The battery device may include at least one battery pack, and a plurality of batteries are included in the battery pack and arranged in a preset order. When the battery is a prismatic battery, the plurality of batteries in the battery pack are arranged in order, and the first side walls 131 of the adjacent batteries in the battery pack are opposite (the batteries are stacked along the large surface). When the battery is a cylindrical battery, the plurality of batteries in the battery pack can be placed upright in the battery device, or the plurality of batteries in the battery pack can be placed lying in the battery device.

[0065] Furthermore, the battery device provided by the embodiments of the present disclosure may further include a box body, a heat exchange component, a power management component, etc. The box body has a battery compartment and an electrical compartment. The battery is arranged in the battery compartment, and the power management component is arranged in the electrical compartment. The heat exchange component is at least partially thermally connected to the battery (for example, the heat exchange component abuts against the battery, or the heat exchange component is connected to the battery through a thermal conductive adhesive).

[0066] Exemplarily, the box body may include a bottom plate and a frame. The frame is connected to the bottom plate, and the frame and the bottom plate enclose a containing space. A partition beam is arranged in the containing space, and the partition beam divides the containing space inside the frame into a battery compartment and an electrical compartment. Of course, in actual applications, there may not be a partition beam between the battery compartment and the electrical compartment, that is, the battery compartment and the electrical compartment are communicated, and the embodiments of the present disclosure do not make specific limitations on this.

[0067] The battery device provided by the embodiments of the present disclosure includes a battery. By providing an insulating coating 20 on the battery housing 10, the problem of poor safety caused by the easy breakdown of the insulating blue film for insulation on the battery surface in the related art is solved, and the safety of the battery device is improved. And at least part of the surface of the housing has a single-layer insulating coating, and the single-layer insulating coating avoids the problem of poor bonding of the interlayer interfaces existing in the multi-layer coating. Further, the average size of the units in the single-layer insulating coating is 1mm 2 -10mm 2 , on the one hand, it avoids the problem that the average unit size is too small, resulting in too high viscosity of the coating, which is not conducive to the spreading of the coating, causing poor appearance, obvious particle feeling on the coating surface, and more seriously, resulting in discontinuous coating coverage and local substrate exposure, improving the quality and insulating performance of the insulating coating 20. On the other hand, it avoids the problem that the average unit size is too large, resulting in too low viscosity of the coating, which is prone to sagging and causes the problem of too thin single-layer coating.

[0068] The battery device provided by the embodiments of the present disclosure can be applied to electric vehicles. When the battery device is used for electric vehicles, the battery device can be a battery pack, and the battery pack is installed on the electric vehicle to provide energy for the electric vehicle.

[0069] In practical applications, the battery pack can be installed on the frame of an electric vehicle. The battery pack can be fixedly connected to the frame. Or the battery pack can be a modular battery pack, and the modular battery pack can be detachably connected to the vehicle body for easy replacement.

[0070] The exemplary embodiments of the present disclosure also provide an electrical device, and the electrical device includes the above-mentioned battery device. For example, the electrical device can be an electric vehicle or an energy storage base station, etc.

[0071] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises: A battery housing, wherein the surface of the battery housing is provided with an insulating coating, and at least a portion of the surface of the battery housing has a single-layer insulating coating, and the average size of the cells in the single-layer insulating coating is 1 mm 2 -10mm 2 .

2. The battery according to claim 1, characterized in that The average size of the cells in the single-layer insulation coating is 1.5 mm 2 -8mm 2 .

3. The battery according to claim 1, characterized in that The average unit width depth of the insulating coating is 2 μm-50 μm.

4. The battery according to claim 1, characterized in that Within an area of ​​15 mm×15 mm in the single-layer insulating coating, the number of units of the insulating coating is 10-100.

5. The battery according to any one of claims 1 to 4, characterized in that: The average cell size is the average cell size detected by BYKspectro2profiler, and the average cell depth is the average cell depth detected by BYKspectro2profiler.

6. The battery according to claim 1, characterized in that The thickness of the single-layer insulating coating is h, the average size of the unit is Cs, and 5≤h / Cs≤80.

7. The battery according to claim 1 or 6, characterized in that: When h is greater than or equal to 80 μm, 2 mm 2 ≤Cs≤5mm 2 .

8. The battery according to claim 1, characterized in that The battery housing includes a first end wall and a side wall, the first end wall and the side wall are connected, and the first end wall and the side wall are an integrally formed structure, a first transition portion is formed between the first end wall and the side wall, and the first transition portion is provided with a single-layer insulating coating.

9. The battery according to claim 8, characterized in that The minimum thickness of the insulating coating at the first transition portion is h1, the thickness of the insulating coating at the side wall is h2, and when h1 / h2>0.5, the average unit size of the insulating coating at the side wall is 2 mm 2 -8mm 2 .

10. The battery according to claim 8, characterized in that The radius of the first transition portion is R, the average unit size of the insulating coating at the side wall is Cs1, and 0.05≤R / Cs1≤5.

11. The battery according to claim 1 or 8, characterized in that: The battery shell includes a first end wall, a second end wall and a side wall, the first end wall and the side wall form a shell body, the shell body has an opening at one end away from the first end wall, the second end wall is sealed at the opening of the shell body, a second transition portion is formed between the second end wall and the side wall, and a multi-layer insulating coating is arranged at the second transition portion.

12. The battery according to claim 1, characterized in that The battery housing comprises a first end wall and a side wall, wherein the first end wall is connected to the side wall, and the first end wall and / or the side wall are coated with a single-layer insulating coating.

13. The battery according to claim 12, characterized in that The battery is a quadrangular prism battery, the side wall includes a first side wall and a second side wall, the area of ​​the first side wall is greater than the area of ​​the second side wall, the first side wall is provided with a single-layer insulating coating, the wall thickness of the first side wall is W1, 0.3≤W1×Cs≤8.

14. The battery according to claim 12, characterized in that The battery is a cylindrical battery, and the thickness of the first end wall is W2, 0.5≤W2×Cs≤15.

15. The battery according to claim 1, characterized in that The battery housing is provided with a multi-layer coating area, the multi-layer coating area is provided with a multi-layer insulation coating, the thickness of the outermost single-layer insulation coating in the multi-layer insulation coating is 10 μm-60 μm, and the average unit size of the outermost single-layer insulation coating is 2 mm 2 -10mm 2 .

16. The battery according to claim 1, characterized in that The battery also includes: The number of layers of the positive electrode sheet in the battery cell is p, the thickness of the single positive electrode sheet is q, p×q=m, 900 μm / mm 2 ≤m / Cs≤30000μm / mm 2 .

17. A battery device, characterized in that: The battery device comprises the battery according to any one of claims 1-16.

18. An electrical equipment, characterized in that: The electrical equipment comprises the battery device according to claim 17.

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