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

[0001] This case is a divisional application of application number 202421319535.0, application date 2024.06.11, invention titled Battery, Battery Device and Electrical Equipment. Technical Field

[0002] This disclosure relates to the field of battery technology, and more specifically, to a battery, a battery device, and an electrical appliance. Background Technology

[0003] Electric vehicles typically include a battery pack that powers the vehicle. The battery pack may consist of a housing and multiple batteries arranged sequentially within the housing. To prevent risks such as short circuits during use, the batteries need to be insulated from each other. In related technologies, insulation is achieved by coating the surface of the batteries with an insulating blue film. However, this insulating blue film is easily punctured during use, resulting in poor battery safety.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a battery, battery device, and electrical equipment that improves battery safety to at least some extent.

[0006] According to a first aspect of this disclosure, a battery is provided, the battery comprising:

[0007] A battery casing, wherein an insulating coating is provided on the surface of the battery casing, and at least a portion of the surface of the battery casing has a single layer of insulating coating, wherein the average size of the unit in the single layer of insulating coating is 1 mm. 2 -10mm 2 .

[0008] According to a second aspect of this disclosure, a battery device is provided, the battery device comprising the battery described above.

[0009] According to a third aspect of this disclosure, an electrical appliance is provided, the electrical appliance including the battery device described above.

[0010] The battery provided in this disclosure includes a battery casing. By providing an insulating coating on the battery casing, the safety problem caused by the easy breakdown of the insulating blue film used for insulation on the battery surface in related technologies is solved, thus improving battery safety. Furthermore, at least a portion of the casing surface has a single-layer insulating coating, which avoids the problem of poor interlayer bonding present in multi-layer coatings. Further, the average unit size of the single-layer insulating coating is 1 mm.2 -10mm 2 On the one hand, it avoids the problem of excessively small unit average size, which would result in excessively high coating viscosity, making it difficult for the coating to spread, causing poor appearance, obvious particle texture on the coating surface, and even more seriously, causing discontinuous coating coverage and local exposure of the substrate. This improves the quality and insulation performance of the insulating coating. On the other hand, it avoids the problem of excessively large unit average size, which would result in excessively low coating viscosity, making it easy for the coating to run and resulting in an excessively thin single layer.

[0011] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0013] Figure 1 A schematic diagram of the structure of a battery provided for an exemplary embodiment of this disclosure;

[0014] Figure 2 A schematic diagram of an insulating coating provided for an exemplary embodiment of this disclosure;

[0015] Figure 3 A three-dimensional topographic image of an insulating coating provided for an exemplary embodiment of this disclosure;

[0016] Figure 4 A schematic diagram of the morphology of an insulating coating provided for an exemplary embodiment of this disclosure;

[0017] Figure 5 A schematic diagram of another battery structure provided for an exemplary embodiment of this disclosure.

[0018] 10. Battery casing; 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 Implementation

[0019] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0020] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0021] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0022] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0023] An exemplary embodiment of this disclosure provides a battery, such as Figure 1 and Figure 2 As shown, the battery includes a battery casing 10, the surface of which is provided with an insulating coating 20, and at least a portion of the surface of the battery casing 10 has a single layer of insulating coating, the average size of the single layer of insulating coating being 1 mm. 2 -10mm 2 .

[0024] The battery provided in this embodiment includes a battery casing 10. By providing an insulating coating 20 on the battery casing 10, the problem of poor safety caused by the easy breakdown of the insulating blue film used for insulation on the battery surface in related technologies is solved, thus improving battery safety. Furthermore, at least a portion of the casing surface has a single-layer insulating coating, which avoids the problem of poor interlayer bonding present in multi-layer coatings. Further, the average size of the unit cells in the single-layer insulating coating is 1 mm. 2 -10mm 2 On the one hand, it avoids the problem of excessively small unit average size, which would result in excessively high coating viscosity, making it difficult for the coating to spread, causing poor appearance, obvious particle texture on the coating surface, and even more seriously, causing discontinuous coating coverage and local exposure of the substrate. This improves the quality and insulation performance of the insulating coating 20. On the other hand, it avoids the problem of excessively large unit average size, which would result in excessively low coating viscosity, making it easy for the coating to run and resulting in an excessively thin single layer.

[0025] Furthermore, the battery provided in this embodiment may also include a cell 40 and a terminal assembly 30. The battery casing 10 has an accommodating space, the cell 40 is disposed in the accommodating space within the casing, the terminal assembly 30 is disposed in the battery casing 10, and the terminal assembly 30 and the cell 40 are connected.

[0026] The following will describe in detail the various parts of the battery provided in the embodiments of this disclosure:

[0027] The battery casing 10 forms the outer contour of the battery and protects the internal components such as the battery cell 40, electrolyte, and connectors. The battery casing 10 can be made of aluminum or stainless steel, etc.

[0028] The battery casing 10 may include a first end wall 11, a second end wall 12, and a side wall 13. The side wall 13 has 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 integrally formed or separately formed, and the second end wall 12 and the side wall 13 may be integrally formed or separately formed.

[0029] The insulating coating 20 can be formed on the surface of the battery casing through processes such as spraying, coating, and electrophoresis. The average cell size in a single layer of insulating coating is 1 mm. 2 -10mm 2 For example, the average cell size could be 1mm. 2 1.5mm 2 2mm 2 3mm 2 3.3mm 2 4mm 2 5mm 2 7mm 28mm 2 9.9mm 2 or 10mm 2 Furthermore, the average unit size in a single-layer coating can be 1.5 mm. 2 -8mm 2 .

[0030] The average depth of the unit cell of the insulating coating 20 is 2μm-50μm. For example, the average depth of the unit cell of the insulating coating 20 can be 2μm, 3μm, 5μm, 10μm, 20μm, 30μm, 40μm or 50μm, etc.

[0031] Within a 15mm × 15mm area of ​​a single-layer insulating coating, the number of units in the insulating coating 20 is 10-100. The number of units indicates the number of units that divide the test area. Setting the number of units in the insulating coating 20 to 10-100 avoids two problems: firstly, an excessively large number of units results in an excessively small average size of individual units, leading to high coating viscosity, difficulty in leveling the coating, and severe surface graininess; secondly, an excessively small number of units results in low coating viscosity, leading to poor coating coverage and poor insulation performance in the single-layer insulating coating area.

[0032] The average unit size refers to the average of the three-dimensional topographic data collected from a selected area on the surface of the insulating coating 20. This data is used to obtain an image of the corresponding area, which is then segmented into multiple units by connecting the height vertices in the three-dimensional topography. The area of ​​each unit is its size, and the average size of all units within the selected area is the average unit size. The unit width depth refers to the height difference between the maximum and minimum widths of each coating unit in the three-dimensional topography of the insulating coating 20 surface. The average unit width depth is the average of the width depths of all units within the selected area.

[0033] In this embodiment, the average unit size, average unit depth, and number of units can be obtained using the following method: calculated using the BYK (BYK Chemical Company) spectro2profiler through a rough coating algorithm. During testing, a 15mm × 15mm area is selected as the test area for three-dimensional topography characterization. Based on the three-dimensional topography, lines are drawn connecting the height vertices in the topography to divide the corresponding area into multiple coating units 21. The area of ​​each coating unit 21 is the unit size, and the average size of the multiple coating units 21 is the average unit size. The unit depth is the height difference between the maximum and minimum amplitude of each coating unit 21, and the average unit depth is the average of all unit depths.

[0034] See Figure 3Using the 3D topography image obtained by BYK spectro2profiler, the height vertices in the 3D topography image are found and connected to determine the coating elements in the coating. See [link to documentation]. Figure 4 The unit width depth is the height difference between the maximum and minimum widths in each coating unit.

[0035] It should be noted that the average size of the insulating coating 20 provided in this embodiment is mainly adjusted by the coating formulation. In some embodiments, the coating formulation includes a photosensitive resin, and the average size of the unit can be adjusted by adjusting the type of photosensitive resin. For example, the average size of the unit can be adjusted by adjusting the ratio of high molecular weight polyurethane acrylate and TPGDA monomer, wherein the molecular weight of polyurethane acrylate is controlled in the range of 10,000-50,000.

[0036] It is understandable that when the insulating coating 20 on the battery casing 10 has multiple layers, the average size of the cells in the multi-layer insulating coating can be the same as the average size of the cells in the single-layer insulating coating. That is, the average size of the cells in the multi-layer insulating coating is 1 mm. 2 -10mm 2 Of course, in practical applications, the average size of a unit cell in a multilayer insulating coating may differ from the average size of a unit cell in a single-layer insulating layer, and the embodiments disclosed herein are not limited thereto.

[0037] The battery casing has a multi-layered coating area, which contains multiple layers of insulating coating. The thickness of the outermost single insulating layer is 10μm-60μm, and the average unit size of the outermost single insulating layer is 2mm. 2 -10mm 2 When the battery casing has multiple insulating coatings, the thickness of the outermost single insulating layer is set to 10μm-60μm. This achieves insulation while preventing the outermost insulating layer from becoming too thick. The average size of the outermost insulating layer unit is set to 2mm. 2 -10mm 2 This can increase the smoothness of the battery surface.

[0038] It should be noted that, in this embodiment, a single-layer insulating coating refers to an insulating coating 20 formed by a single spraying process on the surface of the battery casing 10. A multi-layer insulating coating refers to an insulating coating 20 formed by at least two spraying processes on the surface of the battery casing 10, wherein adjacent insulating coatings 20 are interconnected and have a connection interface.

[0039] The thickness of a single-layer insulating coating is h, and the average unit size is Cs, where 5 ≤ h / Cs ≤ 80. By comprehensively adjusting the relationship between the average unit size and the thickness of the single-layer insulating coating, when a large single-layer insulating coating thickness is required, the average unit size cannot be too small. If it is too small, the coating is prone to leveling, making it impossible to achieve the required thickness. Conversely, if the average unit size is too small, the coating will not spread properly, resulting in some areas being too thick and others too thin, leading to poor surface smoothness. The 5 ≤ h / Cs ≤ 80 setting solves these problems.

[0040] When h is greater than or equal to 80 μm, 2 mm 2 ≤Cs≤5mm². When the thickness of a single-layer insulating coating is relatively large, Cs cannot be too small. If it is too small, the coating will not spread properly, resulting in excessively thick coatings in some areas and poor coating smoothness. Nor can it be too small, as it will easily flow and make it difficult to achieve the required insulating coating thickness. Therefore, when h is greater than or equal to 80μm, Cs is set to 2mm². 2 -≤5mm 2 The above problems have been solved.

[0041] In one feasible embodiment of this disclosure, the battery casing 10 includes a first end wall 11 and a side wall 13, which are connected and 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 susceptible to impacts or bumps during battery transportation or use. Setting the first transition portion as a single layer can improve the safety of the battery (there are no interlayer interfaces in the single-layer insulating coating, so it has strong resistance to impact and vibration).

[0042] Optionally, the minimum thickness of the insulating coating 20 at the first transition section is h1, and the thickness of the insulating coating 20 at the sidewall 13 is h2. When h1 / h2>0.5, 2mm 2 ≤Cs≤8mm 2 The coating is prone to sagging at the transition section, but this area is also susceptible to impacts. Therefore, the insulation coating thickness cannot be too thin. Consequently, the sidewall 13Cs cannot be too large; if Cs is too large, the coating thickness adhering to the transition section will be too thin. Simultaneously, the sidewall 13Cs cannot be too small; if Cs is too small, the coating will not spread properly, resulting in excessively thick insulation coating in some areas of the transition section. This prevents timely heat dissipation and may also leave parts of the transition section uncovered by the insulation coating, increasing the risk of insulation failure. 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 meets a requirement of 2mm. 2 ≤Cs≤8mm 2 This reduces the risk of insulation failure in the first transition section.

[0043] For example, the thickness of the insulating coating 20 at the first transition section is 70μm-300μm. This thickness avoids the problem of heat concentration at the first transition section caused by excessive thickness.

[0044] The radius of the first transition section is R, and the average unit size of the insulating coating at the sidewall is Cs1, where 0.05 ≤ R / Cs1 ≤ 5. The radius R and Cs1 of the first transition section need to satisfy 0.05 ≤ R / Cs1 ≤ 5. When R is relatively small, the risk of paint sagging increases. When R is small, Cs1 on the sidewall needs to be controlled to avoid the insulating coating at the transition section being too thin, which increases the risk of insulation failure. In addition, Cs1 can also be too small. If it is too small, the paint cannot spread properly, and it will be more difficult to form a coating at the first transition section.

[0045] In another feasible embodiment of this 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 the 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 multilayer insulating coating is applied to the second transition portion.

[0046] A terminal assembly 30 is disposed on the second end wall 12 and is connected to the battery cell 40. The terminal assembly 30 serves as the output terminal of the battery. For example, the terminal assembly 30 may include a column, a first connecting portion, and a second connecting portion. A mounting hole is provided on the second end wall 12, through which the column passes. The first connecting portion is connected to the end of the column near the battery cell 40, and the first connecting portion is connected to the battery cell 40. The second connecting portion is connected to the end of the column away from the battery cell 40 and is used to connect to an external conductive component (e.g., a busbar).

[0047] In one implementation, such as Figure 5As shown, the battery is a square prism battery. The sidewall 13 includes a first sidewall 131 and a second sidewall 132. The area of ​​the first sidewall 131 is larger than the area of ​​the second sidewall 132. A single-layer insulating coating is provided on the first sidewall, and the wall thickness of the first sidewall is W, 0.3≤W1×Cs≤8. The battery expands during charging and discharging. When the first sidewall 131 is relatively thin, the risk of deformation due to expansion increases. Deformation of the first sidewall 131 under stress will also cause the single-layer insulating coating on its surface to be affected by the expansion force. If Cs is too small, the coating may not spread in some areas. In areas where the coating is too thick, the risk of coating cracking due to stress on the casing increases. Therefore, when the first sidewall 131 has a single-layer insulating coating and the wall is relatively thin, the average unit size cannot be too small. When the first sidewall is relatively thick, the risk of casing deformation under stress is small, and the average unit size can be set smaller. Therefore, W1×Cs is set to 0.3-8.

[0048] When the area of ​​the first sidewall 131 is larger than the area of ​​the second sidewall 132, during the charging and discharging process of the battery, the expansion of the first sidewall 131 is greater than the expansion of the second sidewall 132. Since the expansion of the first sidewall is larger, it is preferable to set the insulating coating on the first sidewall as a single-layer insulating coating.

[0049] For example, the average size of the unit at the first sidewall 131 is 2mm. 2 -5mm 2 The average depth of the unit at the first sidewall 131 is <10μm. The sidewall 13 may include two first sidewalls 131 and two second sidewalls 132, with the two first sidewalls 131 arranged opposite to each other and the two second sidewalls 132 arranged opposite to each other.

[0050] When the quadrangular prism batteries are stacked, multiple batteries are arranged sequentially, and the first sidewalls 131 of adjacent batteries are positioned opposite each other. That is, the first sidewalls 131 are the faces facing each other when the batteries are stacked, and the average size of the cells at the first sidewalls 131 is set to 2mm. 2 -5mm 2 Furthermore, the average depth of the unit at the first sidewall 131 is set to <10μm. On the one hand, this ensures the roughness of the insulating coating 20, which helps to improve the bonding strength when the batteries are bonded and fixed together. On the other hand, it also avoids the problem of poor flatness of the outer surface of the battery caused by the small average size of the unit.

[0051] The thickness of the insulating coating 20 on the first sidewall 131 is 80μm-200μm. In the quadrangular prism battery, the first sidewall 131 of the battery casing 10 experiences the greatest expansion. To prevent the expansion of the battery casing 10 from affecting the insulating coating 20, the thickness of the insulating coating 20 on the first sidewall 131 is set to 80μm-200μm. This avoids the problem of cracking caused by an excessively thick single-layer insulating coating on the first sidewall 131, thus solving the problem of increased risk of cracking due to the transfer of stress from the inside to the outside when using a single-layer coating. On the other hand, it also avoids the problem of poor insulation performance caused by an excessively thin insulating coating 20.

[0052] Furthermore, the average size of the unit at the first end wall 11 is 1 mm. 2 -8mm 2 The average depth of the cells at the first end wall 11 is >8μm. The first end wall 11 is used for bonding and fixing to the battery housing (it can be directly or indirectly connected, for example, structural adhesive is used between the battery and the housing to achieve bonding; or the battery is first bonded and fixed to the support, and the support is connected to the housing). The average size of the cells at the first end wall 11 is 1mm. 2 -8mm 2 The average depth of the unit at the first end wall 11 is >8μm, which can ensure the connection stability between the battery and the battery box.

[0053] When the battery is a prism-shaped battery, a first terminal assembly and a second terminal assembly can be provided on the second end wall 12. The first terminal assembly is the positive terminal of the battery, and the second terminal assembly is the negative terminal of the battery. The first terminal assembly is connected to the positive tab of the battery cell 40, and the second terminal assembly is connected to the negative terminal of the battery cell 40.

[0054] In another embodiment, the battery can be a cylindrical battery. Based on this, the first end wall 11 and the second end wall 12 are disk structures, with the wall thickness of the first end wall being W2, where 0.5 ≤ W2 × Cs ≤ 15.

[0055] The end walls of a cylindrical battery are subject to significant expansion. Therefore, a single-layer insulating coating is applied to the end walls to prevent cracking of the insulating coating during expansion. Furthermore, 0.5 ≤ W² × Cs ≤ 15 further prevents the insulating layer of the first end wall 11 from cracking during expansion.

[0056] When the battery is a cylindrical battery, a terminal assembly 30 is provided on the second end wall 12. The terminal assembly 30 serves as one terminal of the battery, and the other terminal of the battery is the battery casing 10. For example, the terminal assembly 30 is the positive terminal of the battery and is connected to the positive electrode tab of the cell 40, and the battery casing 10 is the negative terminal of the battery and is connected to the negative electrode tab of the cell 40.

[0057] The battery cell 40 is disposed within the battery casing 10, connected to the terminal post, and immersed in the electrolyte. The battery cell 40 includes a battery cell body and electrode tabs, which extend from the battery cell body. There are two electrode tabs on the battery cell body, namely a first electrode tab (positive electrode tab) and a second electrode tab (negative electrode tab). The first electrode tab and the second electrode tab can be connected to corresponding adapters respectively.

[0058] It should be noted that the main body of the battery cell 40 may include two or more electrode plates, and the electrode tabs include two or more single electrode tabs. The single electrode tabs extend from their corresponding electrode plates, and the width of the single electrode tab is smaller than the width of the electrode plate. Multiple single electrode tabs are stacked to form an electrode tab.

[0059] In one embodiment, the battery is a stacked battery, which is not only convenient to assemble, but also allows for the production of batteries with longer lengths. The cell 40 is a stacked cell 40, which has first electrodes stacked on top of each other, second electrodes with opposite electrical polarity to the first electrodes, and a separator disposed between the first electrodes and the second electrodes, thereby stacking multiple pairs of first electrodes and second electrodes to form a stacked cell 40.

[0060] Optionally, the battery cell 40 can be a wound battery cell 40, which is obtained by winding the first electrode, the second electrode with the opposite electrical polarity to the first electrode, and the separator disposed between the first electrode and the second electrode.

[0061] The number of positive electrode layers in the battery cell is p, the thickness of a single positive electrode layer is q, p × q = m, 900 μm / mm 2 ≤m / Cs≤30000μm / mm 2 The larger the product m of the number of positive electrode layers and their thickness in the battery, the greater the battery expansion. When the expansion is large, if Cs is too small, the risk of coating cracking increases in the unspread areas. Therefore, m / Cs is set to 900 μm / mm. 2 ≤m / Cs≤30000μm / mm 2 It can reduce the risk of cracking of the insulating coating, thereby ensuring the insulation performance of the battery after it expands.

[0062] When the two terminals of a single battery cell are a first terminal and a second terminal, the first tab is connected to the first terminal via a first adapter, and the second tab is connected to the second terminal via a second adapter. When the two terminals of a single battery cell are a terminal and a battery casing 10, the first tab is connected to the terminal via a first adapter, and the second terminal is connected to the battery casing 10 via a second adapter.

[0063] The battery provided in this embodiment includes a battery casing 10. By providing an insulating coating 20 on the battery casing 10, the problem of poor safety caused by the easy breakdown of the insulating blue film used for insulation on the battery surface in related technologies is solved, thus improving battery safety. Furthermore, at least a portion of the casing surface has a single-layer insulating coating, which avoids the problem of poor interlayer bonding present in multi-layer coatings. Further, the average size of the unit cells in the single-layer insulating coating is 1 mm. 2 -10mm 2 On the one hand, it avoids the problem of excessively small unit average size, which would result in excessively high coating viscosity, making it difficult for the coating to spread, causing poor appearance, obvious particle texture on the coating surface, and even more seriously, causing discontinuous coating coverage and local exposure of the substrate. This improves the quality and insulation performance of the insulating coating 20. On the other hand, it avoids the problem of excessively large unit average size, which would result in excessively low coating viscosity, making it easy for the coating to run and resulting in an excessively thin single layer.

[0064] An exemplary embodiment of this disclosure also provides a battery device, which includes a battery. The battery includes a battery housing 10, the surface of which is provided with an insulating coating 20, and at least a portion of the housing surface has a single layer of insulating coating, wherein the average size of the cells in the single layer of insulating coating is 1 mm. 2 -10mm 2 .

[0065] The battery device may include at least one battery pack, in which multiple batteries are arranged in a predetermined order. When the batteries are prism-shaped, the multiple batteries in the battery pack are arranged sequentially, and the first sidewalls 131 of adjacent batteries in the battery pack are opposite each other (the batteries are stacked along their large surfaces). When the batteries are cylindrical, the multiple batteries in the battery pack may be placed upright in the battery device, or the multiple batteries in the battery pack may be placed lying down in the battery device.

[0066] Furthermore, the battery device provided in this embodiment may also include a housing, a heat exchange assembly, and a power management assembly, etc. The housing has a battery compartment and an electrical compartment, with the battery disposed in the battery compartment and the power management assembly disposed in the electrical compartment. The heat exchange assembly is at least partially thermally connected to the battery (for example, the heat exchange assembly and the battery abut against each other, or the heat exchange assembly and the battery are connected by thermally conductive adhesive).

[0067] For example, the enclosure may include a base plate and a frame, which are connected to the base plate. The base plate and frame form an accommodating space, and a partition beam is provided within the accommodating space to divide the accommodating space within the frame into a battery compartment and an electrical compartment. Of course, in practical applications, a partition beam may not be provided between the battery compartment and the electrical compartment, that is, the battery compartment and the electrical compartment may be connected. This disclosure does not specifically limit this.

[0068] The battery device provided in this disclosure includes a battery. By providing an insulating coating 20 on the battery casing 10, the safety problem caused by the easy breakdown of the insulating blue film used for insulation on the battery surface in related technologies is solved, thus improving the safety of the battery device. Furthermore, at least a portion of the casing surface has a single-layer insulating coating, which avoids the problem of poor interlayer bonding present in multi-layer coatings. Further, the average size of the unit cells in the single-layer insulating coating is 1 mm. 2 -10mm 2 On the one hand, it avoids the problem of excessively small unit average size, which would result in excessively high coating viscosity, making it difficult for the coating to spread, causing poor appearance, obvious particle texture on the coating surface, and even more seriously, causing discontinuous coating coverage and local exposure of the substrate. This improves the quality and insulation performance of the insulating coating 20. On the other hand, it avoids the problem of excessively large unit average size, which would result in excessively low coating viscosity, making it easy for the coating to run and resulting in an excessively thin single layer.

[0069] The battery device provided in this disclosure can be applied to electric vehicles. When the battery device is used in an electric vehicle, the battery device can be a battery pack, which is installed on the electric vehicle to provide energy to the electric vehicle.

[0070] In practical applications, the battery pack can be mounted on the frame of an electric vehicle. The battery pack can be fixedly connected to the frame. Alternatively, the battery pack can be a modular battery pack, which can be detachably connected to the vehicle body for easy replacement.

[0071] This exemplary embodiment also provides an electrical device, which includes the battery device described above. For example, the electrical device may be an electric vehicle or an energy storage base station.

[0072] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery, characterized in that, The battery includes: A battery casing with an insulating coating on its surface. The battery casing includes a first end wall and a side wall, which are connected and integrally formed. 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. The average size of the unit in the single-layer insulating coating is 1 mm. 2 -10mm 2 Furthermore, the average unit size of the insulating coating at the sidewall is 2mm. 2 -8mm 2 .

2. The battery as described in claim 1, characterized in that, The average depth of the insulating coating unit is 2μm-50μm.

3. The battery as described in claim 1, characterized in that, Within a 15mm × 15mm area of ​​the single-layer insulating coating, the number of units in the insulating coating is 10-100.

4. The battery as described in any one of claims 1-3, characterized in that, The average cell size is the average cell size obtained by BYK spectro2profiler, and the average cell width is the average cell width obtained by BYK spectro2profiler.

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

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

7. The battery as claimed in claim 1, characterized in that, The minimum thickness of the insulating coating at the first transition section is h1, and the thickness of the insulating coating at the sidewall is h2, where h1 / h2>0.

5.

8. The battery as claimed in claim 1, characterized in that, The radius of the first transition section is R, and the average unit size of the insulating coating at the sidewall is Cs1, where 0.05≤R / Cs1≤5.

9. The battery as claimed in claim 1, characterized in that, The battery casing further includes a second end wall, the first end wall and the side wall form a casing body, the end of the casing body opposite to the first end wall has an opening, the second end wall seals the opening of the casing body, a second transition portion is formed between the second end wall and the side wall, and a multilayer insulating coating is provided at the second transition portion.

10. The battery as claimed in claim 1, characterized in that, The battery casing has a multi-layer coating area, which contains multiple insulating coatings. The thickness of the outermost single insulating layer is 10μm-60μm, and the average unit size of the outermost single insulating layer is 2mm. 2 -10mm 2 .

11. The battery as claimed in claim 1, characterized in that, The battery also includes: The battery cell has p layers of positive electrode plates, and the thickness of a single positive electrode plate is q, where p × q = m, and 900 μm / mm. 2 ≤m / Cs≤30000μm / mm 2 .

12. A battery device, characterized in that, The battery device includes the battery according to any one of claims 1-11.

13. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 12.

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