Cylindrical battery shell, cylindrical battery, battery pack and electric equipment

Abstract

The utility model discloses a cylindrical battery shell, a cylindrical battery, a battery pack and electric equipment. The cylindrical battery shell comprises two opposite end faces and a cylindrical surface connected between the two end faces, the two end faces are each provided with a first coating, the cylindrical surface at least comprises a first area, the first area is provided with a second coating, the first coating is an insulating coating, and the second coating is a heat insulation coating. Compared with an existing cylindrical battery shell, the cylindrical battery shell has the advantages that the insulation and heat insulation effects are better, a heat insulation plate does not need to be arranged between the adjacent shells, the use cost of materials can be saved, the overall structure of the battery pack is simpler, and the weight of the battery pack is lighter.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a cylindrical battery case, a cylindrical battery, a battery pack, and an electrical device. Background Art

[0002] Power batteries are classified by shape into cylindrical batteries, soft-pack batteries, square batteries, etc. Among them, the material of the outer shell of a cylindrical battery is generally aluminum or nickel-plated steel, etc. Usually, a heat-shrinkable film made of polyvinyl chloride is coated on the outer surface of the cylindrical battery case to provide insulation protection for the cylindrical battery. However, the heat-shrinkable film has a single function and only plays a role in insulating and protecting the cylindrical battery case without other additional functions. After the cylindrical battery case is coated with the heat-shrinkable film, an additional heat-insulating board is required between adjacent cylindrical batteries in the battery pack for heat insulation, and the structure of the battery pack is complex, and the use cost of materials is increased. Summary of the Utility Model

[0003] The embodiments of the present application provide a cylindrical battery case, a cylindrical battery, a battery pack, and an electrical device.

[0004] The cylindrical battery case of the embodiments of the present application includes two oppositely arranged end faces and a cylindrical surface connected between the two end faces. First coatings are provided on both of the two end faces. The cylindrical surface at least includes a first region, and a second coating is provided on the first region. The first coating is an insulating coating, and the second coating is a heat-insulating and insulating coating.

[0005] In some embodiments, the thickness of the insulating coating ranges from [100 μm, 120 μm].

[0006] In some embodiments, the thickness of the heat-insulating and insulating coating ranges from [190 μm, 210 μm].

[0007] In some embodiments, the thickness of the insulating coating ranges from [100 μm, 120 μm]; the thickness of the heat-insulating and insulating coating ranges from [190 μm, 210 μm].

[0008] In some embodiments, the material of the insulating coating is phenolic epoxy acrylate, silicone acrylate, or fluorocarbon acrylate.

[0009] In some embodiments, the heat-insulating and insulating coating includes an insulating layer and a heat-insulating layer. The material of the insulating layer is organic-inorganic hybrid acrylate or fluorocarbon acrylate, and / or the material of the heat-insulating layer is ceramic powder, aluminum silicate fiber, or glass microsphere.

[0010] In some embodiments, the cylindrical surface further includes a second region provided with a third coating, and the third coating is an insulating coating or a thermally insulating coating.

[0011] In some embodiments, the thickness of the thermally insulating coating ranges from [100 μm, 120 μm].

[0012] In some embodiments, the thermally insulating coating includes an insulating layer and a thermally conductive layer. The material of the insulating layer is phenolic epoxy acrylate, silicone acrylate or fluorocarbon acrylate, and / or the material of the thermally conductive layer is alumina, magnesia, zinc oxide or silicon nitride.

[0013] In some embodiments, the thermally insulating coating is a phase change insulating coating, which includes an insulating layer and a phase change layer. The material of the insulating layer is phenolic epoxy acrylate, silicone acrylate or fluorocarbon acrylate, and / or the material of the phase change layer is phase change microcapsules, paraffin, fatty acids or polyols.

[0014] The cylindrical battery according to the embodiment of the present application includes the cylindrical battery housing and the electrode core described in the above embodiments, and the electrode core is disposed inside the cylindrical battery housing.

[0015] The battery pack according to the embodiment of the present application includes the cylindrical battery described in the above embodiments.

[0016] In some embodiments, the battery pack includes at least one row and at least one column of cylindrical batteries. The battery pack further includes a liquid cooling member disposed between adjacent two rows or adjacent two columns of the cylindrical batteries and in contact with the cylindrical surface.

[0017] In some embodiments, the liquid cooling member is in contact with the third coating on the cylindrical surface.

[0018] In some embodiments, when the third coating on the cylindrical surface is an insulating coating, at least a thermally insulating layer is coated on the contact surface where the liquid cooling member contacts the third coating, and at least a part of the thermally insulating layer is in contact with the third coating on the cylindrical surface.

[0019] In some embodiments, there are multiple liquid cooling members; there are multiple rows of cylindrical batteries between adjacent two liquid cooling members, and the second coatings of the cylindrical batteries in two adjacent rows without the liquid cooling member face each other and are in contact.

[0020] In some embodiments, there are multiple liquid cooling members; there are multiple columns of cylindrical batteries between adjacent two liquid cooling members, and the second coatings of the cylindrical batteries in two adjacent columns without the liquid cooling member face each other and are in contact.

[0021] In some embodiments, the liquid cooling member is a serpentine liquid cooling plate.

[0022] In some embodiments, the liquid cooling plate includes an arcuate concave portion and an arcuate convex portion. The concave portion and the convex portion are alternately connected. The concave portion contacts the cylindrical surface, and the vertex of the convex portion extends into the gap between two adjacent cylindrical batteries. The radius of curvature of the concave portion is the same as the radius of the cylindrical battery.

[0023] In some embodiments, adhesive is filled between two cylindrical batteries and between the cylindrical battery and the liquid cooling member.

[0024] The electrical device according to the embodiment of the present application includes the battery pack described in the above embodiment.

[0025] In the cylindrical battery housing, cylindrical battery, battery pack, and electrical device according to the embodiment of the present application, insulating coatings are provided on both end faces. A second coating is provided in the first region, and the second coating is a heat-insulating and insulating coating. Compared with the current cylindrical battery housing, the cylindrical battery housing of the present application has better insulation and heat insulation effects. There is no need to additionally provide a heat-insulating plate between adjacent housings, which can save the use cost of materials, and the overall structure of the battery pack is relatively simple, and the weight of the battery pack is also lighter.

[0026] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0028] Figure 1 is a three-dimensional schematic diagram of a cylindrical battery according to some embodiments of the present application;

[0029] Figure 2 is a three-dimensional schematic diagram of a cylindrical battery housing according to some embodiments of the present application;

[0030] Figure 3 is Figure 2 an unfolded schematic diagram of the cylindrical battery housing of;

[0031] Figure 4 is a three-dimensional schematic diagram of a battery pack according to some embodiments of the present application;

[0032] Figure 5 is Figure 4 a top view schematic diagram of the battery pack of;

[0033] Figure 6It is a schematic structural diagram of an electrical device according to some embodiments of the present application.

[0034] Description of main component symbols:

[0035] 10000, electrical device; 1000, battery pack; 100, cylindrical battery; 300, liquid cooling component; 301, recess; 303, protrusion; 10, cylindrical battery housing; 11, end face; 111, first coating; 13, cylindrical surface; 131, first region; 1311, second coating; 133, second region; 1331, third coating; 30, electrode core. Specific embodiments

[0036] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the specific embodiments of the present application in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0041] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0042] In terms of the external shape, power batteries include cylindrical batteries, soft-pack batteries, square batteries, etc. The material of the outer shell of a cylindrical battery is generally aluminum or nickel-plated steel, etc. Usually, a heat-shrinkable film made of polyvinyl chloride is coated on the outer surface of the cylindrical battery shell to provide insulation protection for the cylindrical battery. However, the heat-shrinkable film has a single function and only plays a role in insulating and protecting the cylindrical battery shell without other additional functions. After the cylindrical battery shell is coated with the heat-shrinkable film, additional heat insulation plates are required between adjacent cylindrical batteries in the battery pack, resulting in a complex structure of the battery pack and an increase in the material usage cost. To solve this problem, the embodiments of this application provide a cylindrical battery shell 10( Figure 2 as shown), a cylindrical battery 100( Figure 1 as shown), a battery pack 1000( Figure 4 as shown) and an electrical device 10000( Figure 6 as shown).

[0043] Please refer to Figure 1, the cylindrical battery 100 of the embodiment of the present application includes a cylindrical battery housing 10 and an electrode core 30, and the electrode core 30 is disposed inside the cylindrical battery housing 10.

[0044] Among them, the cylindrical battery 100 is used to provide electrical energy for other components, and the outer shape of the cylindrical battery 100 is generally cylindrical. The cylindrical battery housing 10 (hereinafter simply referred to as "housing 10") is used to protect the internal electrode core 30 and other components, etc., and the housing 10 can also prevent the electrolyte inside the housing 10 from leaking. The housing 10 can isolate the electrode core 30 and the electrolyte inside the housing 10 from the outside world, and can prevent external water vapor and dust from entering the housing 10 to affect the service life and performance of the cylindrical battery 100. The electrode core 30 is used to store and output electrical energy. The electrode core 30 includes a positive electrode and a negative electrode. The positive electrode is usually made of a lithium compound (for example, lithium cobalt manganese, or lithium nickel cobalt aluminum, etc.), and the negative electrode is usually made of a carbon material (for example, graphite, etc.). During charging, the positive electrode absorbs lithium ions, and the negative electrode releases lithium ions, and the electrolyte is used to provide an ion transport channel; during discharging, the process is reversed. This migration of ions realizes the storage and release of electrical energy. To prevent the cylindrical battery 100 from short-circuiting, the positive electrode and the negative electrode can be separately arranged. Exemplarily, the positive electrode and the negative electrode can be respectively arranged at opposite ends of the cylindrical battery 100 to reduce the risk of short-circuiting of the cylindrical battery 100.

[0045] The cylindrical battery 100 may further include an explosion-proof valve and a liquid injection port. The liquid injection port can be opened on the housing 10, and the liquid injection port can be located on the end face 11 where the positive electrode is located, or can be located on the end face 11 where the negative electrode is located. The liquid injection port is used to inject the electrolyte into the housing 10. The explosion-proof valve can be disposed inside the housing 10, and the explosion-proof valve can be located on the end face 11 where the positive electrode is located, or can be located on the end face 11 where the negative electrode is located. The explosion-proof valve is used to prevent the battery from exploding under abnormal conditions (such as overcharging, over-discharging, and short-circuiting, etc.). When the internal pressure of the cylindrical battery 100 exceeds a preset safety threshold, the explosion-proof valve will automatically open to release the internal pressure, thereby preventing the cylindrical battery 100 from bursting or exploding.

[0046] Please refer to Figure 2 and Figure 3 , the cylindrical battery housing 10 of the embodiment of the present application includes two relatively arranged end faces 11 and a cylindrical surface 13 connected between the two end faces 11. First coatings 111 are provided on both end faces 11, and the cylindrical surface 13 at least includes a first region 131, and a second coating 1311 is provided on the first region 131. The first coating 111 is an insulating coating; the second coating 1311 is a heat-insulating and insulating coating.

[0047] Specifically, the positive electrode cover plate of the cylindrical battery 100 is provided on one end face 11 of the housing 10, and the negative electrode cover plate of the cylindrical battery 100 is provided on the other end face 11 of the housing 10. The positive electrode cover plate is connected to the positive electrode inside the housing 10, and the positive electrode cover plate is used to ensure that current can be smoothly transmitted from the inside of the battery to the external circuit. The negative electrode cover plate is connected to the negative electrode inside the housing 10 to complete the transmission of current. When the first coating 111 is an insulating coating, the insulating coating has a good insulating and protective effect on the two end faces 11 of the housing 10. The insulating coating can insulate the positive electrode cover plate and the negative electrode cover plate from the outside world, avoiding the problem of short circuit caused by the mutual contact between adjacent housings 10, and the insulating coating can effectively improve the safety performance of the cylindrical battery 100. Preferably, the first coating 111 (insulating coating) is coated on each position of the outer surface of the two end faces 11 of the housing 10, so that the insulating effect of the housing 10 is better, and the problem of short circuit between adjacent housings 10 can be avoided.

[0048] In some embodiments, the material of the insulating coating may include at least one or more of phenolic epoxy acrylate, silicone acrylate, and fluorocarbon acrylate. The insulating coating has good insulating voltage resistance, electrolyte resistance, adhesion, and aging resistance. Exemplarily, when the adhesion of the insulating coating is strong, the connection between the insulating coating and the housing 10 is tighter, and the insulating coating is difficult to fall off relative to the housing 10. Moreover, when the housing 10 and other components are connected by adhesive, the insulating coating can also improve the bonding strength between the housing 10 and other components.

[0049] The heat-insulating and insulating coating has good insulating and protective performance and heat-insulating performance, and the heat-insulating and insulating coating also has good voltage resistance, electrolyte resistance, high temperature resistance, adhesion, and aging resistance. Exemplarily, when the adhesion of the heat-insulating and insulating coating is strong, the connection between the heat-insulating and insulating coating and the housing 10 is tighter, and the heat-insulating and insulating coating is difficult to fall off relative to the housing 10. Moreover, when the housing 10 and other components are connected by adhesive, the heat-insulating and insulating coating can also improve the bonding strength between the housing 10 and other components. The heat-insulating and insulating coating includes an insulating layer and a heat-insulating layer. The material of the insulating layer may include at least one or more of organic-inorganic hybrid acrylate and fluorocarbon acrylate, and / or the material of the heat-insulating layer may include at least one or more of ceramic powder, aluminum silicate fiber, glass microspheres, etc.

[0050] Since the cylindrical surface 13 is usually made of materials such as aluminum or steel, the cylindrical surface 13 can have the ability to conduct electricity. When adjacent housings 10 are in contact with each other, there is a risk of short circuit in the cylindrical battery 100. When an insulating coating and / or a heat-insulating and insulating coating is coated on the cylindrical surface 13, the coating has a good insulating and protective effect on the cylindrical surface 13, and the cylindrical surface 13 can be insulated from the outside world, thereby avoiding the problem of short circuit caused by the mutual contact between adjacent housings 10.

[0051] Please refer to Figure 2 and Figure 3 When the second coating 1311 is a heat-insulating and insulating coating, the first region 131 can be connected to the adjacent cylindrical battery case 10. The second coating 1311 (heat-insulating and insulating coating) has a good heat-insulating effect. While ensuring the insulation of the first region 131, the heat-insulating and insulating coating can also provide a good heat-insulating effect on the first region 131, and can avoid the heat transfer between adjacent cylindrical batteries 100. When the first region 131 is provided with a heat-insulating and insulating coating, there is no need to provide a heat-insulating plate between adjacent cases 10, which can save material costs and the space of the battery pack 1000. The overall structure of the battery pack 1000 is relatively simple, and the weight reduction of the battery pack 1000 can also be achieved.

[0052] In the cylindrical battery case 10 of the embodiment of the present application, insulating coatings are provided on both end faces 11. The first region 131 is provided with a second coating 1311, and the second coating 1311 is a heat-insulating and insulating coating. Compared with the current cylindrical battery case 10, the cylindrical battery case 10 of the present application has better insulation and heat-insulating effects. There is no need to additionally provide a heat-insulating plate between adjacent cases 10, which can save the usage cost of materials, and the overall structure of the battery pack 1000 is relatively simple, and the weight of the battery pack 1000 is also lighter.

[0053] The following further describes the cylindrical battery case 10 with reference to the accompanying drawings.

[0054] Please refer to Figure 2 and Figure 3 In some embodiments, the thickness of the insulating coating ranges from [100 μm, 120 μm]. At this time, the thickness of the first coating 111 ranges from [100 μm, 120 μm].

[0055] Exemplarily, the thickness of the insulating coating can be 100 μm, 103 μm, 104 μm, 107 μm, 111 μm, 113 μm, 114 μm, 116 μm, 118 μm, or 120 μm, etc. When the thickness of the insulating coating is less than 100 μm, the insulating coating is too thin, and the insulating protection effect of the insulating coating is poor. Adjacent cases 10 may come into contact, and a short-circuit problem may occur, and the safety performance of the cylindrical battery 100 is poor. When the thickness of the insulating coating is greater than 120 μm, the insulating coating is too thick, the usage cost of materials is high, and the overall weight of the case 10 is heavy, which is not conducive to the lightweight design of the cylindrical battery 100. When the thickness of the insulating coating ranges from [100 μm, 120 μm], the insulating protection effect of the insulating coating is good, the safety performance of the cylindrical battery 100 is good, and the weight of the case 10 is not too heavy, which is conducive to the lightweight design of the cylindrical battery 100.

[0056] Please refer to Figure 2 and Figure 3 , in some embodiments, the thickness of the thermal insulation coating ranges from [190 μm, 210 μm]. At this time, the thickness of the second coating 1311 ranges from [190 μm, 210 μm].

[0057] Exemplarily, the thickness of the second coating 1311 can be 190 μm, 193 μm, 195 μm, 198 μm, 201 μm, 203 μm, 204 μm, 207 μm, 209 μm, or 210 μm, etc. When the thickness of the second coating 1311 is less than 190 μm, the thickness of the thermal insulation coating is too thin, and both the insulation performance and the heat insulation performance of the thermal insulation coating are poor. When the thickness of the thermal insulation coating is greater than 210 μm, the thickness of the thermal insulation coating is too thick, the material usage cost is high, and the overall weight of the housing 10 is heavy, which is not conducive to the lightweight design of the cylindrical battery 100. When the thickness of the thermal insulation coating ranges from [190 μm, 210 μm], both the insulation performance and the heat conduction performance of the thermal insulation coating are good, and the weight of the housing 10 will not be too heavy, which is conducive to the lightweight design of the cylindrical battery 100.

[0058] Please refer to Figure 2 and Figure 3 , the cylindrical surface 13 further includes a second region 133, and a third coating 1331 is provided on the second region 133. The third coating 1331 is an insulating coating or a thermally conductive insulating coating.

[0059] Among them, the cylindrical surface 13 includes a first region 131 and a second region 133. The cylindrical surface 13 may further include a third region, a fourth region, a fifth region, or other regions, etc. When the cylindrical surface 13 includes a third region, a fourth region, a fifth region, or other regions, an insulating coating, a thermally conductive insulating coating, a thermal insulation coating, or other coatings may be provided on the third region, the fourth region, the fifth region, or other regions. The cylindrical surface 13 of the embodiment of the present application includes a first region 131 and a second region 133, and the extending direction of the dividing line between the first region 131 and the second region 133 is the same as the axial direction of the cylindrical surface 13.

[0060] The heat-conducting and insulating coating has good insulating and heat-conducting properties, and also has good voltage resistance, electrolyte resistance, adhesion, and aging resistance. Exemplarily, when the adhesion of the heat-conducting and insulating coating is strong, the connection between the heat-conducting and insulating coating and the housing 10 is tighter, and it is difficult for the heat-conducting and insulating coating to fall off relative to the housing 10. Moreover, when the housing 10 and other components are connected by an adhesive, the heat-conducting and insulating coating can also improve the bonding strength between the housing 10 and other components. The heat-conducting and insulating coating includes an insulating layer and a heat-conducting layer. The material of the insulating layer may include at least one or more of phenolic epoxy acrylate, silicone acrylate, and fluorocarbon acrylate, and / or the material of the heat-conducting layer may include at least one or more of alumina, magnesia, zinc oxide, silicon nitride, etc.

[0061] In some embodiments, the heat-conducting and insulating coating may be a phase-change insulating coating. The phase-change insulating coating has good heat-conducting and insulating properties. The phase-change insulating coating includes an insulating layer and a phase-change layer. The material of the insulating layer may be at least one or more of phenolic epoxy acrylate, silicone acrylate, and fluorocarbon acrylate, and / or the material of the phase-change layer is at least one or more of phase-change microcapsules, paraffin, fatty acids, and polyols.

[0062] Please refer to Figure 2 and Figure 3 , the second region 133 can be connected to the outside (atmosphere) or other components. In one embodiment, the third coating 1331 is a heat-conducting and insulating coating. At this time, the heat-conducting ability of the third coating 1331 (heat-conducting and insulating coating) is strong. While ensuring the insulation of the second region 133, the heat-conducting and insulating coating can effectively dissipate the heat of the cylindrical surface 13 to the outside, so that the heat dissipation effect of the cylindrical battery 100 is better. In another embodiment, the third coating 1331 is an insulating coating. At this time, the insulation effect of the third coating 1331 is good. When the second region 133 contacts other components or the adjacent housing 10, the risk of short circuit can be avoided, and the safety performance of the cylindrical battery 100 can be improved. When the third coating 1331 is an insulating coating, the value range of the thickness of the third coating 1331 can be [100 μm, 120 μm].

[0063] In the embodiment of the present application, the first region 131 is provided with a heat-insulating and insulating coating, and the second region 133 is provided with a heat-conducting and insulating coating. At this time, the area of the second region 133 can be less than or equal to the area of the first region 131. When the housing 10 is in contact with multiple adjacent housings 10, the first region 131 can effectively insulate between the adjacent housings 10.

[0064] Please refer to Figure 2 and Figure 3, in some embodiments, the thickness of the thermally conductive insulating coating ranges from [100 μm, 120 μm]. At this time, the thickness of the third coating 1331 ranges from [100 μm, 120 μm].

[0065] Exemplarily, the thickness of the thermally conductive insulating coating can be 100 μm, 103 μm, 104 μm, 107 μm, 111 μm, 113 μm, 114 μm, 116 μm, 118 μm, or 120 μm, etc. When the thickness of the thermally conductive insulating coating is less than 100 μm, the thermally conductive insulating coating is too thin, and both the insulating performance and the thermal conductivity of the thermally conductive insulating coating are poor. When the thickness of the thermally conductive insulating coating is greater than 120 μm, the thermally conductive insulating coating is too thick, the material usage cost is high, and the overall weight of the housing 10 is heavy, which is not conducive to the lightweight design of the cylindrical battery 100. When the thickness of the thermally conductive insulating coating ranges from [100 μm, 120 μm], both the insulating performance and the thermal conductivity of the thermally conductive insulating coating are good, and the weight of the housing 10 will not be too heavy, which is conducive to the lightweight design of the cylindrical battery 100.

[0066] Please refer to Figure 4 , the battery pack 1000 of the embodiment of the present application includes the cylindrical battery 100 of the above embodiment. Among them, the battery pack 1000 includes a plurality of cylindrical batteries 100, and the battery pack 1000 is used to store electrical energy and can supply power to other components.

[0067] In the battery pack 1000 of the embodiment of the present application, insulating coatings are provided on both end faces 11. The second coating 1311 is provided in the first region 131, and the second coating 1311 is a heat-insulating insulating coating. Compared with the current cylindrical battery housing 10, the insulation and heat insulation effects of the cylindrical battery housing 10 of the present application are better. There is no need to additionally provide a heat insulation board between adjacent housings 10, which can save the material usage cost, and the overall structure of the battery pack 1000 is relatively simple, and the weight of the battery pack 1000 is also light.

[0068] Please refer to Figures 2 to 4 , in some embodiments, the battery pack 1000 includes at least one row of cylindrical batteries 100 and at least one column of cylindrical batteries 100. The battery pack 1000 further includes a liquid cooling member 300, and the liquid cooling member 300 is disposed between adjacent two rows of cylindrical batteries 100 or between adjacent two columns of cylindrical batteries 100 and contacts the cylindrical surface 13.

[0069] Among them, a row of cylindrical batteries 100 may include at least two mutually contacting cylindrical batteries 100, and a column of cylindrical batteries 100 may also include at least two mutually contacting cylindrical batteries 100. The battery pack 1000 may include one row of cylindrical batteries 100, two rows of cylindrical batteries 100 or more rows of cylindrical batteries 100. The battery pack 1000 may include one column of cylindrical batteries 100, two columns of cylindrical batteries 100 or more columns of cylindrical batteries 100. The battery pack 1000 in the present application includes three rows of cylindrical batteries 100 and five columns of cylindrical batteries 100.

[0070] The liquid cooling member 300 is provided with a circulating coolant, so that the liquid cooling member 300 can take away the heat of the cylindrical battery 100 to prevent the temperature of the cylindrical battery 100 from being too high, which may shorten the service life or even cause a safety accident. When the liquid cooling member 300 is in contact with the cylindrical surface 13, the contact area between the liquid cooling member 300 and the housing 10 is relatively large, so that the liquid cooling member 300 can effectively and quickly take away the heat of the cylindrical battery 100 to dissipate the heat of the cylindrical battery 100.

[0071] Please refer to Figure 4 and Figure 5 , in some embodiments, the liquid cooling member 300 is a serpentine liquid cooling plate. Specifically, in some embodiments, the liquid cooling plate includes an arcuate concave portion 301 and an arcuate convex portion 303. The concave portion 301 and the convex portion 303 are alternately connected. The concave portion 301 is in contact with the cylindrical surface 13, and the vertex of the convex portion 303 extends into the gap between two adjacent cylindrical batteries 100. The radius of curvature of the concave portion 301 is the same as the radius of the cylindrical battery 100.

[0072] When the radius of curvature of the concave portion 301 is the same as the radius of the cylindrical battery 100, the concave portion 301 can fit well with the cylindrical surface 13, and the contact area between the concave portion 301 and the cylindrical surface 13 is relatively large. Thus, the heat of the cylindrical battery 100 can be effectively taken away by the liquid cooling plate, and the cooling effect of the liquid cooling plate on the cylindrical battery 100 is better.

[0073] Please refer to Figures 2 to 5 , the liquid cooling member 300 is in contact with the third coating 1331. In one embodiment, when the third coating 1331 is a thermally conductive insulating coating, the thermally conductive insulating coating can effectively conduct the heat of the cylindrical battery 100 to the liquid cooling member 300, so that the heat of the cylindrical battery 100 can be taken away by the liquid cooling member 300. When the liquid cooling member 300 is in contact with the thermally conductive insulating coating, the heat dissipation efficiency of the liquid cooling member 300 for the cylindrical battery 100 is relatively high, and the heat dissipation effect is also better.

[0074] Please refer to Figures 2 to 5, in some other embodiments, when the third coating 1331 is an insulating coating, at least a heat-conducting insulating layer is coated on the contact surface where the liquid cooling member 300 contacts the third coating 1331, and at least a part of the heat-conducting insulating layer contacts the third coating 1331 (insulating coating). The heat of the cylindrical battery 100 is transferred to the heat-conducting insulating layer on the liquid cooling member 300 through the insulating coating, and this heat-conducting insulating layer can quickly conduct the heat to the liquid cooling member 300, so that the liquid cooling member 300 can take away this part of the heat to dissipate heat from the cylindrical battery 100.

[0075] Please refer to Figure 4 and Figure 5 , there can be multiple liquid cooling members 300 in the battery pack 1000. In some embodiments, there are multiple rows of cylindrical batteries 100 provided between two adjacent liquid cooling members 300, and the second coatings 1311 (heat-insulating insulating coatings) of two adjacent rows of cylindrical batteries 100 where no liquid cooling member 300 is provided face each other and contact. Due to economic cost considerations, there can be two rows, three rows or more rows of cylindrical batteries 100 provided between two adjacent liquid cooling members 300. Preferably, there can be two rows of cylindrical batteries 100 provided between two adjacent liquid cooling members 300. At this time, the liquid cooling member 300 has a better heat dissipation effect on the cylindrical battery 100, and at the same time, cost can be saved. The heat-conducting insulating coating or insulating coating of one row of cylindrical batteries 100 contacts one liquid cooling member 300, and the heat-conducting insulating coating or insulating coating of the other row of cylindrical batteries 100 contacts another liquid cooling member 300. The two rows of cylindrical batteries 100 contact each other through the second coating 1311 (heat-insulating insulating coating contact). Thus, heat exchange between the two rows of cylindrical batteries 100 can be avoided, and the heat of each row of cylindrical batteries 100 can be effectively conducted to the liquid cooling member 300 and taken away by the liquid cooling member 300, and the liquid cooling member 300 has a better cooling effect on the cylindrical battery 100. At this time, there is no need to provide a heat-insulating plate between the two rows of cylindrical batteries 100, and the overall structure of the battery pack 1000 is relatively simple, with a lighter weight, and material costs can be saved.

[0076] Please refer to Figure 4 and Figure 5, in some other embodiments, multiple columns of cylindrical batteries 100 are provided between two adjacent liquid cooling components 300. The second coatings 1311 (heat-insulating and insulating coatings) of two adjacent columns of cylindrical batteries 100 where no liquid cooling component 300 is provided face each other and are in contact. Considering economic costs, two, three or more columns of cylindrical batteries 100 can be provided between two adjacent liquid cooling components 300. Preferably, two columns of cylindrical batteries 100 can be provided between two adjacent liquid cooling components 300. At this time, the liquid cooling component 300 has a good heat dissipation effect on the cylindrical battery 100 and can also save costs. The heat-conducting and insulating coating or insulating coating of one column of cylindrical batteries 100 is in contact with one liquid cooling component 300, and the heat-conducting and insulating coating or insulating coating of the other column of cylindrical batteries 100 is in contact with the other liquid cooling component 300. The two columns of cylindrical batteries 100 are in contact with each other through the second coating 1311 (heat-insulating and insulating coating). Thus, heat exchange between the two columns of cylindrical batteries 100 can be avoided, and the heat of each column of cylindrical batteries 100 can be effectively conducted to the liquid cooling component 300 and taken away by the liquid cooling component 300. The liquid cooling component 300 has a good cooling effect on the cylindrical battery 100. At this time, there is no need to provide a heat-insulating plate between the two columns of cylindrical batteries 100, and the overall structure of the battery pack 1000 is relatively simple, with a light weight and material cost savings.

[0077] Please refer to Figure 4 and Figure 5 , in some embodiments, adhesives are filled between two cylindrical batteries 100 and between the cylindrical battery 100 and the liquid cooling component 300. The adhesives can make the connection between two adjacent cylindrical batteries 100 relatively tight, and can also make the connection between the cylindrical surface 13 of the cylindrical battery 100 and the liquid cooling component 300 relatively tight. Thus, the overall structure of the battery pack 1000 is relatively stable, and it can be avoided that the cylindrical batteries 100 and the liquid cooling plate in the battery pack 1000 are displaced when the battery pack 1000 moves, vibrates or is subjected to external force impact. When the connection between the cylindrical surface 13 of the cylindrical battery 100 and the liquid cooling component 300 is relatively tight, the liquid cooling component 300 has a good heat dissipation effect on the cylindrical battery 100 and a high heat dissipation efficiency.

[0078] Please refer to Figure 6 , the electrical device 10000 of the embodiment of the present application includes the battery pack 1000 of the above embodiment. Among them, the electrical device 10000 can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.

[0079] In the electrical device 10000 according to the embodiment of the present application, insulating coatings are provided on both end faces 11. A second coating 1311 is provided in the first region 131, and the second coating 1311 is a heat-insulating and insulating coating. Compared with the current cylindrical battery case 10, the cylindrical battery case 10 of the present application is coated with different insulating materials in different regions, so that the insulating and heat-insulating effects of the cylindrical battery case 10 are better. There is no need to additionally provide a heat-insulating plate between adjacent cases 10, which can save the use cost of materials, and the overall structure of the battery pack 1000 is relatively simple, and the weight of the battery pack 1000 is also lighter.

[0080] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification is covered. At the same time, other embodiments can be derived from the above embodiments, so that structural and logical substitutions and changes can be made without departing from the scope of the present disclosure.

[0081] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A cylindrical battery housing (10), characterized in that: The invention comprises two end faces (11) arranged opposite to each other and a cylindrical surface (13) connected between the two end faces (11); the two end faces (11) are both provided with a first coating (111); the cylindrical surface (13) comprises at least a first region (131); the first region (131) is provided with a second coating (1311); the first coating (111) is an insulating coating; and the second coating (1311) is a heat-insulating coating.

2. The cylindrical battery housing (10) according to claim 1, characterized in that: The thickness of the insulating coating ranges from [100 μm, 120 μm]; and / or The thickness of the thermal insulation coating ranges from [190 μm, 210 μm].

3. The cylindrical battery housing (10) according to claim 1, characterized in that: The material of the insulating coating is phenolic epoxy acrylate, silicone acrylate or fluorocarbon acrylate.

4. The cylindrical battery housing (10) according to claim 1, characterized in that: The heat-insulating coating comprises an insulating layer and a heat-insulating layer. The insulating layer is made of organic-inorganic hybrid acrylate or fluorocarbon acrylate, and / or the heat-insulating layer is made of ceramic powder, aluminum silicate fiber or glass microbeads.

5. The cylindrical battery housing (10) according to claim 1, characterized in that: The cylindrical surface (13) further comprises a second region (133), the second region (133) being provided with a third coating (1331), the third coating (1331) being an insulating coating or a heat-conducting insulating coating.

6. The cylindrical battery housing (10) according to claim 5, characterized in that: The thickness of the thermally conductive insulating coating ranges from [100 μm, 120 μm].

7. The cylindrical battery housing (10) according to claim 5, characterized in that: The thermally conductive insulating coating comprises an insulating layer and a thermally conductive layer, the insulating layer is made of phenolic epoxy acrylate, silicone acrylate or fluorocarbon acrylate, and / or the thermally conductive layer is made of aluminum oxide, magnesium oxide, zinc oxide or silicon nitride.

8. The cylindrical battery housing (10) according to claim 5, characterized in that: The thermally conductive insulating coating is a phase change insulating coating, which includes an insulating layer and a phase change layer. The material of the insulating layer is phenolic epoxy acrylate, silicone acrylate or fluorocarbon acrylate, and / or the material of the phase change layer is phase change microcapsules, paraffin, fatty acid or polyol.

9. A cylindrical battery (100), characterized in that: include: The cylindrical battery casing (10) according to any one of claims 1 to 8; and A pole core (30), wherein the pole core (30) is arranged inside the cylindrical battery casing (10).

10. A battery pack (1000), characterized in that: include: The cylindrical battery (100) as claimed in claim 9.

11. The battery pack (1000) according to claim 10, characterized in that: The battery pack (1000) comprises at least one row of cylindrical batteries (100) and at least one column of cylindrical batteries (100). The battery pack (1000) further comprises a liquid cooling element (300). The liquid cooling element (300) is arranged between two adjacent rows of cylindrical batteries (100) or between two adjacent columns of cylindrical batteries (100) and is in contact with the cylindrical surface (13).

12. The battery pack (1000) according to claim 11, characterized in that: The liquid cooling element (300) is in contact with the third coating (1331) on the cylindrical surface (13).

13. The battery pack (1000) according to claim 11, characterized in that: In the case where the third coating (1331) on the cylindrical surface (13) is an insulating coating, at least a heat-conducting insulating layer is coated on the contact surface of the liquid cooling component (300) in contact with the third coating (1331), and at least a portion of the heat-conducting insulating layer is in contact with the third coating (1331).

14. The battery pack (1000) according to claim 11, characterized in that: There are multiple liquid cooling parts (300); A plurality of rows of cylindrical batteries (100) are provided between two adjacent liquid cooling members (300), and the second coating layers (1311) of the cylindrical batteries (100) in two adjacent rows where the liquid cooling members (300) are not provided are opposite to and in contact with each other; or A plurality of columns of cylindrical batteries (100) are arranged between two adjacent liquid cooling members (300), and the second coating layers (1311) of the cylindrical batteries (100) in two adjacent columns where the liquid cooling members (300) are not arranged face each other and contact each other.

15. The battery pack (1000) according to claim 11, characterized in that: The liquid cooling component (300) is a serpentine liquid cooling plate.

16. The battery pack (1000) according to claim 15, characterized in that: The liquid cooling component (300) comprises an arc-shaped concave portion (301) and an arc-shaped convex portion (303), wherein the concave portion (301) and the convex portion (303) are alternately connected, the concave portion (301) contacts the cylindrical surface (13), the apex of the convex portion (303) extends into the gap between two adjacent cylindrical batteries, and the curvature radius of the concave portion is the same as the radius of the cylindrical battery.

17. The battery pack (1000) according to claim 11, characterized in that: Glue is filled between the two cylindrical batteries (100) and between the cylindrical battery (100) and the liquid cooling component (300).

18. An electrical device (10000), characterized in that: A battery pack (1000) comprising any one of claims 10-17.

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