Cylindrical battery, battery device, and electric device

Abstract

The utility model discloses a cylindrical battery, battery device and electric device, cylindrical battery includes: shell and electrode assembly, shell includes casing and outer insulating layer, and the outer insulating layer covers the outer surface of casing and includes insulating adhesive tape and insulating coating, and the at least part of insulating adhesive tape and the at least part of insulating coating all cover the outer circumferential surface of casing, along the axial direction of casing, and insulating coating is located at least one side of insulating adhesive tape and is connected with insulating adhesive tape, and electrode assembly is located in shell. According to the cylindrical battery of the utility model, the outer insulating layer covers the outer surface of casing and includes insulating adhesive tape and insulating coating, and the insulating coating can be firmly attached on the outer surface of casing and has excellent scratch resistance, so that the insulating protective performance of the outer insulating layer can be improved, and the reliability of the cylindrical battery can be improved.

Description

Technical Field

[0001] The present utility model relates to the technical field of batteries, in particular to a cylindrical battery, a battery device and an electricity-consuming apparatus. Background Art

[0002] With the continuous development of the new energy industry, batteries are applied in more and more fields. Among them, the housing of the battery is usually a metal housing. In order to improve the safety performance of the battery, an insulating layer is usually provided on the surface of the battery housing. However, the insulation protection performance of the insulating layer in the related art is prone to failure, which directly affects the overall reliability of the battery. Therefore, how to improve the insulation protection performance of the insulating layer has become an urgent problem to be solved. Contents of Utility Model

[0003] In a first aspect, the present utility model provides a cylindrical battery, which has the advantage of improving the insulation protection performance of the outer insulating layer.

[0004] The cylindrical battery according to the embodiment of the first aspect of the present utility model includes: a housing, the housing comprising a casing and an outer insulating layer, the outer insulating layer covering the outer surface of the casing and comprising an insulating adhesive tape and an insulating coating, at least part of the insulating adhesive tape and at least part of the insulating coating both covering the outer peripheral surface of the casing, and along the axial direction of the casing, the insulating coating is located on at least one side of the insulating adhesive tape and is in contact with the insulating adhesive tape; and an electrode assembly, arranged inside the housing.

[0005] In the cylindrical battery according to the embodiment of the first aspect of the present utility model, the outer insulating layer covers the outer surface of the casing and includes the insulating adhesive tape and the insulating coating. The insulating coating can be firmly attached to the outer surface of the casing and has excellent scratch resistance, so that the insulation protection performance of the outer insulating layer can be improved, and further the reliability of the cylindrical battery can be enhanced.

[0006] According to some embodiments of the present utility model, the coverage area of the insulating coating on the outer peripheral surface of the casing is smaller than the coverage area of the insulating adhesive tape on the outer peripheral surface of the casing.

[0007] According to some embodiments of the present utility model, the ratio of the coverage area of the insulating coating on the outer peripheral surface of the casing to the coverage area of the insulating adhesive tape on the outer peripheral surface of the casing ranges from 1% to 50%.

[0008] According to some embodiments of the present utility model, the thickness T1 of the insulating coating and the thickness T2 of the insulating adhesive tape satisfy: 0.001mm≤T1≤1mm, 0.001mm≤T2≤1mm; and / or, 0≤|T1-T2| / T1≤3.

[0009] According to some embodiments of the present invention, along the axial direction of the housing, the insulating coating located on the same side as the insulating adhesive paper is a single insulating coating, the single insulating coating including a first coating portion disposed on the outer peripheral surface of the housing, the first coating portion being in contact with the insulating adhesive paper; wherein, along the axial direction of the housing, the height H1 of the first coating portion and the height H2 of the housing satisfy: 0.01≤H1 / H2≤0.3; and / or, a groove is formed on the outer peripheral surface of the housing, the first coating portion covering the groove.

[0010] According to some embodiments of the present invention, along the axial direction of the housing, the insulating coating located on the same side of the insulating adhesive paper is a single insulating coating. The single insulating coating includes a first coating portion and a second coating portion. The first coating portion is disposed on the outer peripheral surface of the housing and is in contact with the insulating adhesive paper. The second coating portion is disposed on the axial end face of the housing and is connected to the first coating portion. The connection position between the first coating portion and the second coating portion is located at the connection between the outer peripheral surface of the housing and the axial end face of the housing.

[0011] According to some embodiments of the present invention, the area S1 of the projection of the second coating portion on the reference surface and the area S2 of the projection of the axial end face of the housing on the reference surface satisfy: 0.01≤S1 / S2≤0.5, the reference surface is perpendicular to the axial direction of the housing; and / or, the second coating portion is annular.

[0012] According to some embodiments of the present invention, along the axial direction of the housing, the insulating coating is located on one side of the insulating adhesive paper, the second coating portion is disposed on one of the axial end faces of the housing, the insulating adhesive paper includes a first adhesive paper portion and a second adhesive paper portion, the first adhesive paper portion covers the outer peripheral surface of the housing and is in contact with the first coating portion, the second adhesive paper portion is disposed on the other axial end face of the housing and is connected to the first adhesive paper portion, and the connection position of the first adhesive paper portion and the second adhesive paper portion is located at the connection between the outer peripheral surface of the housing and the axial end face of the housing; or, along the axial direction of the housing, the insulating coating is located on both sides of the insulating adhesive paper.

[0013] According to some embodiments of the present invention, the insulating tape and the insulating coating overlap at their contact points; wherein, along the axial direction of the housing, the overlap width between the insulating tape and the insulating coating is no more than 10 mm; and / or, the portion of the insulating tape that overlaps with the insulating coating is located on the side of the insulating coating away from the housing.

[0014] According to some embodiments of the present invention, the insulating coating includes a bonding coating and an outer coating, wherein the bonding coating is located between the outer coating and the outer surface of the housing.

[0015] According to some embodiments of the present invention, the bonding coating includes a polyurethane layer; and / or, the outer coating includes one of a polyepoxy resin layer or a polyacrylate layer.

[0016] The second aspect of this utility model provides a battery device.

[0017] The battery device according to a second aspect of the present invention includes: the cylindrical battery described above.

[0018] According to the battery device of the second aspect of the present invention, the outer insulating layer covers the outer surface of the housing and includes insulating tape and insulating coating. The insulating coating can be firmly attached to the outer surface of the housing and has excellent scratch resistance, thereby improving the insulating protection performance of the outer insulating layer. In addition, the low cost of the insulating tape can reduce the production cost of the outer insulating layer, thereby improving the reliability of the cylindrical battery and reducing the production cost of the cylindrical battery.

[0019] The second aspect of this utility model proposes an electrical device.

[0020] The electrical device according to a second aspect of the present invention includes: the battery device described above.

[0021] According to the second aspect of the present invention, the electrical device has an outer insulating layer covering the outer surface of the housing and includes insulating tape and an insulating coating. The insulating coating can be firmly attached to the outer surface of the housing and has excellent scratch resistance, thereby improving the insulating protection performance of the outer insulating layer. Furthermore, the low cost of the insulating tape can reduce the production cost of the outer insulating layer, thereby improving the reliability of the cylindrical battery and reducing the production cost of the cylindrical battery.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a cylindrical battery according to an embodiment of the present utility model; Figure 2 This is a cross-sectional view of a cylindrical battery according to an embodiment of the present utility model; Figure 3 yes Figure 2 Enlarged view of region A in the middle; Figure 4 This is a front view of a cylindrical battery according to Embodiment 1 of this utility model; Figure 5 This is a top view of a cylindrical battery according to Embodiment 1 of this utility model; Figure 6This is a bottom view of a cylindrical battery according to Embodiment 1 of this utility model; Figure 7 This is a front view of a cylindrical battery according to Embodiment 2 of this utility model; Figure 8 This is a top view of the cylindrical battery according to Embodiment 2 of this utility model; Figure 9 This is a bottom view of a cylindrical battery according to Embodiment 2 of this utility model; Figure 10 This is a front view of a cylindrical battery according to Embodiment 3 of this utility model; Figure 11 This is a top view of a cylindrical battery according to Embodiment 3 of this utility model; Figure 12 This is a bottom view of a cylindrical battery according to Embodiment 3 of this utility model; Figure 13 This is a schematic diagram of the connecting coating and the outer coating of the insulating coating of a cylindrical battery according to an embodiment of the present invention.

[0024] Figure label: 100. Cylindrical battery; 1. Outer casing; 11. Housing; 111. Groove; 12. Outer insulating layer; 121. Insulating tape; 1211. First tape portion; 1212. Second tape portion; 122. Insulating coating; 1221. First coating portion; 1222. Second coating portion; 1223. Connecting coating; 1224. Outer coating; 2. Electrode assembly. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0027] In the description of this utility model, 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., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0029] In the description of this utility model, "multiple" means two or more.

[0030] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0031] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0032] The cylindrical battery 100 according to a first aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0033] like Figures 1 to 3 As shown, the cylindrical battery 100 according to the first aspect of the present invention includes: a housing 1 and an electrode assembly 2. The housing 1 includes a shell 11 and an outer insulating layer 12. The outer insulating layer 12 covers the outer surface of the shell 11 and includes an insulating adhesive tape 121 and an insulating coating 122. At least a portion of the insulating adhesive tape 121 and at least a portion of the insulating coating 122 cover the outer peripheral surface of the shell 11. Along the axial direction of the shell 11, the insulating coating 122 is located on at least one side of the insulating adhesive tape 121 and is in contact with the insulating adhesive tape 121. The electrode assembly 2 is disposed inside the housing 1.

[0034] In other words, the insulating tape 121 and the insulating coating 122 work together to provide insulation protection for the housing 11. It should be noted that the insulating tape 121 has low cost and simple installation process. For example, the insulating tape 121 can be a thermoplastic sleeve or a blue film. The thermoplastic sleeve can be fitted onto the housing 11 and heated to shrink and fix it to the housing 11. The blue film can be directly fixed to the outer surface of the housing 11 by adhesive. The insulating coating 122 can be firmly attached to the outer surface of the housing 11 and has excellent scratch resistance. For example, the insulating coating 122 can be formed by spraying or printing insulating material on the outer surface of the housing 11 and curing it. The insulating coating 122 can be arranged on parts of the housing 11 that are easily scratched (such as the connection positions of different sides of the housing 11) and high-temperature areas. Since the insulating coating 122 is usually a polymer coating, it has relatively high hardness, making it less likely to be scratched or punctured. Therefore, during the use of the cylindrical battery 100, the insulating coating 122 can avoid the risk of peeling or being scratched by sharp objects due to factors such as high temperature environment, thereby improving the insulation protection performance of the outer insulating layer 12.

[0035] According to the first aspect of the present invention, the cylindrical battery 100 has an outer insulating layer 12 covering the outer surface of the housing 11 and includes an insulating adhesive paper 121 and an insulating coating 122. The insulating coating 122 can be firmly attached to the outer surface of the housing 11 and has excellent scratch resistance, thereby improving the insulation and protection performance of the outer insulating layer 12 and thus improving the reliability of the cylindrical battery 100.

[0036] Among them, the insulating tape 121 can be a thermoplastic sleeve or a blue film, and both the thermoplastic sleeve and the blue film can be PET (Polyethylene terephthalate).

[0037] According to some embodiments of this utility model, the coverage area of ​​the insulating coating 122 on the outer peripheral surface of the housing 11 is smaller than the coverage area of ​​the insulating adhesive paper 121 on the outer peripheral surface of the housing 11. Since the insulating coating 122 has a relatively high cost, controlling the coverage area of ​​the insulating coating 122 on the outer peripheral surface of the housing 11 to be smaller than the coverage area of ​​the insulating adhesive paper 121 on the outer peripheral surface of the housing 11 can better control the input of the insulating coating 122, thereby effectively reducing the production cost of the cylindrical battery 100.

[0038] According to some embodiments of this utility model, the ratio of the coverage area of ​​the insulating coating 122 on the outer peripheral surface of the housing 11 to the coverage area of ​​the insulating adhesive paper 121 on the outer peripheral surface of the housing 11 ranges from 1% to 50%. If the ratio is too small, the coverage area of ​​the insulating coating 122 will be insufficient to effectively improve the insulation and protective performance of the outer insulation layer 12. If the ratio is too large, the coverage area of ​​the insulating coating 122 on the outer peripheral surface of the housing 11 will result in an excessive increase in the cost of the outer insulation layer 12. Therefore, by controlling the coating area of ​​the insulating coating 122 on the outer peripheral surface of the housing 11 to be within the range of 10% to 20% of the coverage area of ​​the insulating tape 121 on the outer peripheral surface of the housing 11, it is possible to control the production cost of the outer insulation layer 12 while ensuring that the insulating coating 122 has sufficient coverage area on the housing 11 to improve the insulation and protective effect of the outer insulation layer 12. For example, the ratio of the coverage area of ​​the insulating coating 122 to the coverage area of ​​the insulating tape 121 can be 1%, 3%, 5%, 10%, 20%, 30%, 40%, 50%, etc.

[0039] According to some embodiments of this utility model, the thickness T1 of the insulating coating 122 and the thickness T2 of the insulating adhesive paper 121 satisfy: 0.001mm≤T1≤1mm, 0.001mm≤T2≤1mm. That is, the thickness of both the insulating coating 122 and the insulating adhesive paper 121 is controlled within the range of 0.001mm to 1mm. If the thickness of the insulating coating 122 and the insulating adhesive paper 121 is too thin, they are easily broken down, affecting the insulation effect; if the thickness of the insulating coating 122 and the insulating adhesive paper 121 is too thick, the production cost will increase and the size of the cylindrical battery 100 will increase, resulting in a decrease in energy density.

[0040] Therefore, by controlling the thickness of both the insulating coating 122 and the insulating tape 121 within the range of 0.001mm to 1mm, the production cost of the cylindrical battery 100 can be reduced and the size of the cylindrical battery 100 can be minimized while ensuring the insulating and protective performance of the insulating tape 121 and the insulating coating 122. For example, the thickness of the insulating coating 122 can be 0.001mm, 0.002mm, 0.005mm, 0.01mm, 0.02mm, 0.05mm, 0.1mm, 0.2mm, 0.5mm, 1mm, etc., and the thickness of the insulating tape 121 can be 0.001mm, 0.002mm, 0.005mm, 0.01mm, 0.02mm, 0.05mm, 0.1mm, 0.2mm, 0.5mm, 1mm, etc., without specific limitations.

[0041] According to some embodiments of this utility model, the thickness T1 of the insulating coating 122 and the thickness T2 of the insulating adhesive paper 121 satisfy: 0 ≤ |T1-T2| / T1 ≤ 3. That is, the ratio of the absolute value of the thickness difference between the insulating coating 122 and the insulating adhesive paper 121 to the thickness of the insulating coating 122 is controlled within a range not exceeding 3. It can be understood that the larger the ratio of the absolute value of the thickness difference between the insulating coating 122 and the insulating adhesive paper 121 to the thickness of the insulating coating 122, the larger the absolute value of the thickness difference between the insulating coating 122 and the insulating adhesive paper 121, and the greater the difference in thickness between the insulating coating 122 and the insulating adhesive paper 121. If the difference in thickness between the insulating coating 122 and the insulating adhesive paper 121 is too large, it will lead to a significant drop at the joint position of the insulating coating 122 and the insulating adhesive paper 121.

[0042] Therefore, by controlling the ratio of the absolute value of the thickness difference between the insulating coating 122 and the insulating tape 121 to the thickness of the insulating coating 122 to no more than 3, the thickness difference between the insulating coating 122 and the insulating tape 121 can be effectively controlled within a small range. This avoids significant drop-offs at the joint between the insulating coating 122 and the insulating tape 121, thereby improving the flatness of the outer circumference of the outer shell 1. For example, the ratio of the absolute value of the thickness difference between the insulating coating 122 and the insulating tape 121 to the thickness of the insulating coating 122 can be 0, 0.2, 0.5, 0.8, 1, 1.5, 2, 2.5, 3, etc.

[0043] According to some embodiments of this utility model, along the axial direction of the housing 11, the insulating coating 122 located on the same side as the insulating adhesive paper 121 is a single insulating coating 122. The single insulating coating 122 includes a first coating portion 1221 disposed on the outer peripheral surface of the housing 11, and the first coating portion 1221 is in contact with the insulating adhesive paper 121. That is, the insulating coating 122 provides insulation protection to the outer peripheral surface of the housing 11 through the first coating portion 1221. The contact between the first coating portion 1221 and the insulating adhesive paper 121 can prevent insulation failure caused by gaps between the insulating adhesive paper 121 and the insulating coating 122.

[0044] In some embodiments, along the axial direction of the housing 11, the height H1 of the first coating portion 1221 and the height H2 of the housing 11 satisfy: 0.01 ≤ H1 / H2 ≤ 0.3. Wherein, with the height of the housing 11 fixed, a higher ratio of the height of the first coating portion 1221 to the height of the housing 11 results in a larger coverage area of ​​the insulating coating 122 on the housing 11, and a better improvement in the insulation protection performance of the outer insulation layer 12, but also a higher investment cost for the insulating coating 122; conversely, a lower ratio of the height of the first coating portion 1221 to the height of the housing 11 results in a smaller coverage area of ​​the insulating coating 122 on the housing 11, and a lower investment cost for the insulating coating 122, but a lower improvement in the insulation protection performance of the outer insulation layer 12.

[0045] Therefore, by controlling the height ratio of the first coating portion 1221 to the housing 11 within the range of 0.01 to 0.3, it is possible to avoid the insulation and protective performance of the outer insulation layer 12 being affected by an excessively small height of the first coating portion 1221, and to avoid the production cost of the outer insulation layer 12 being increased by an excessively large height of the first coating portion 1221. In other words, the production cost of the outer insulation layer 12 can be controlled while ensuring its insulation and protective performance. For example, the height ratio of the first coating portion 1221 to the housing 11 can be 0.01, 0.02, 0.05, 0.08, 0.1, 0.13, 0.15, 0.2, 0.25, 0.3, etc.

[0046] In some embodiments, a groove 111 is formed on the outer peripheral surface of the housing 11, and a first coating portion 1221 covers the groove 111. Thus, by covering the groove 111 with the first coating portion 1221, the insulation and protection performance of the outer insulation layer 12 at the groove 111 can be better improved, and the structural strength at the groove 111 can also be better improved.

[0047] According to some embodiments of this utility model, along the axial direction of the housing 11, the insulating coating 122 located on the same side as the insulating adhesive paper 121 is a single insulating coating 122. The single insulating coating 122 includes a first coating portion 1221 and a second coating portion 1222. The first coating portion 1221 is disposed on the outer peripheral surface of the housing 11 and is in contact with the insulating adhesive paper 121. The second coating portion 1222 is disposed on the axial end face of the housing 11 and is connected to the first coating portion 1221. The connection point between the first coating portion 1221 and the second coating portion 1222 is located at the junction of the outer peripheral surface of the housing 11 and the axial end face of the housing 11. In other words, a single insulating coating 122 can effectively cover the junction between the outer peripheral surface of the housing 11 and the axial end face of the housing 11. The insulating coating 122 has strong adaptability to the shape of the area where it is applied, allowing the outer insulating layer 12 to better cover the connection between the outer peripheral surface of the housing 11 and the axial end face of the housing 11. Furthermore, the insulating coating 122 has strong scratch resistance, which can prevent the connection between the outer peripheral surface of the housing 11 and the axial end face of the housing 11 from scratching the outer insulating layer 12. In addition, the insulating coating 122 can provide insulation protection to the housing 11 from the axial side of the housing 11 through the second coating part 1222, thereby improving the insulation protection performance of the outer insulating layer 12.

[0048] According to some embodiments of this utility model, the projected area S1 of the second coating portion 1222 on the reference surface and the projected area S2 of the axial end face of the housing 11 on the reference surface satisfy: 0.01≤S1 / S2≤0.5, and the reference surface is perpendicular to the axial direction of the housing 11. That is, the coverage area of ​​the second coating portion 1222 on the axial end face of the housing 11 is controlled within the range of 1% to 50% of the area of ​​the axial end face of the housing 11. Among them, with the area of ​​the axial end face of the housing 11 fixed, the higher the ratio of S1 to S2, the larger the coverage area of ​​the insulating coating 122 on the housing 11, and the better the improvement effect of the insulation protection performance of the outer insulation layer 12, but the higher the investment cost of the insulating coating 122; conversely, the lower the ratio of S1 to S2, the smaller the coverage area of ​​the insulating coating 122 on the housing 11, the lower the investment cost of the insulating coating 122, but the lower the improvement effect of the insulating coating 122 on the insulation protection performance of the outer insulation layer 12.

[0049] Therefore, by controlling the coverage area of ​​the second coating portion 1222 on the axial end face of the housing 11 to within the range of 1% to 50% of the area of ​​the axial end face of the housing 11, it is possible to avoid the insulation and protective performance of the outer insulation layer 12 being affected by an excessively small coverage area of ​​the second coating portion 1222, and to avoid the production cost of the outer insulation layer 12 being increased by an excessively large coverage area. In other words, the production cost of the outer insulation layer 12 can be controlled while ensuring its insulation and protective performance. For example, the ratio of S1 to S2 can be 0.01, 0.02, 0.05, 0.08, 0.1, 0.13, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, etc.

[0050] According to some embodiments of the present invention, the second coating portion 1222 is annular. Therefore, the hollow area at the center of the second coating portion 1222 facilitates the lead-out of the positive or negative electrode of the cylindrical battery 100. For example, the hollow area of ​​the second coating portion 1222 provided on the positive electrode side of the cylindrical battery 100 facilitates the lead-out of the positive electrode of the cylindrical battery 100, and the hollow area of ​​the second coating portion 1222 provided on the negative electrode side of the cylindrical battery 100 facilitates the lead-out of the negative electrode of the cylindrical battery 100, thereby facilitating the series or parallel connection of multiple cylindrical batteries 100.

[0051] According to some embodiments of the present invention, the insulating coating 122 is located on one side of the insulating adhesive tape 121, and the second coating portion 1222 is disposed on one of the axial end faces of the housing 11. The insulating adhesive tape 121 includes a first adhesive tape portion 1211 and a second adhesive tape portion 1212. The first adhesive tape portion 1211 covers the outer peripheral surface of the housing 11 and is in contact with the first coating portion 1221. The second adhesive tape portion 1212 is disposed on the other axial end face of the housing 11 and is connected to the first adhesive tape portion 1211. The connection position between the first adhesive tape portion 1211 and the second adhesive tape portion 1212 is located at the connection between the outer peripheral surface of the housing 11 and the axial end face of the housing 11.

[0052] In other words, the second coating portion 1222 and the second adhesive tape portion 1212 are respectively located on both axial end faces of the housing 11. The second coating portion 1222 provides insulation protection for the housing 11 on one axial end face, and the second adhesive tape portion 1212 provides insulation protection for the housing 11 on the other axial end face. The first coating portion 1221 and the first adhesive tape portion 1211 work together to provide insulation protection for the housing 11 on its outer peripheral surface. This increases the coverage area of ​​the outer insulation layer 12 on different sides of the housing 11, thereby improving the insulation protection effect of the outer insulation layer 12 on the housing 11.

[0053] According to some embodiments of this utility model, the projected area S3 of the second adhesive tape portion 1212 on the reference surface and the projected area S2 of the axial end face of the housing 11 on the reference surface satisfy: 0.01≤S3 / S2≤0.5, and the reference surface is perpendicular to the axial direction of the housing 11. That is, the coverage area of ​​the second adhesive tape portion 1212 on the axial end face of the housing 11 is controlled within the range of 1% to 50% of the area of ​​the axial end face of the housing 11. Among them, with the area of ​​the axial end face of the housing 11 fixed, the higher the ratio of S3 to S2, the larger the coverage area of ​​the second adhesive tape portion 1212 on the housing 11, and the better the improvement effect of the insulation protection performance of the outer insulation layer 12, but the higher the investment cost of the insulating adhesive tape 121; conversely, the lower the ratio of S3 to S2, the smaller the coverage area of ​​the second adhesive tape portion 1212 on the housing 11, the lower the investment cost of the insulating adhesive tape 121, but the lower the improvement effect of the insulating adhesive tape 121 on the insulation protection performance of the outer insulation layer 12.

[0054] Therefore, by controlling the coverage area of ​​the second adhesive tape portion 1212 on the axial end face of the housing 11 to within the range of 1% to 50% of the area of ​​the axial end face of the housing 11, it is possible to avoid the insulation and protective performance of the outer insulation layer 12 being affected by an excessively small coverage area of ​​the second adhesive tape portion 1212, and to avoid the production cost of the outer insulation layer 12 being increased by an excessively large coverage area. In other words, the production cost of the outer insulation layer 12 can be controlled while ensuring its insulation and protective performance. For example, the ratio of S3 to S2 can be 0.01, 0.02, 0.05, 0.08, 0.1, 0.13, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, etc.

[0055] According to some embodiments of the present invention, the second adhesive tape portion 1212 is annular. Therefore, the hollow area at the center of the second adhesive tape portion 1212 facilitates the lead-out of the positive or negative electrode of the cylindrical battery 100. For example, the hollow area of ​​the second adhesive tape portion 1212 provided on the positive electrode side of the cylindrical battery 100 facilitates the lead-out of the positive electrode of the cylindrical battery 100, and the hollow area of ​​the second adhesive tape portion 1212 provided on the negative electrode side of the cylindrical battery 100 facilitates the lead-out of the negative electrode of the cylindrical battery 100, thereby facilitating the series or parallel connection of multiple cylindrical batteries 100.

[0056] According to some embodiments of this utility model, along the axial direction of the housing 11, the insulating coating 122 is located on both sides of the insulating tape 121. That is, along the axial direction of the housing 11, a single insulating coating 122 is provided on each opposite side of the insulating tape 121. One insulating coating 122 is located on the positive electrode side of the housing 11, and the other insulating coating 122 is located on the negative electrode side of the housing 11. The two insulating coatings 122 can respectively cover the connection between the outer peripheral surface of the housing 11 and the end faces on both sides of the axial direction of the housing 11. Specifically, the insulating coating 122 on the positive electrode side can cover the connection position between the outer peripheral surface of the housing 11 and the positive end face of the housing 11, and the insulating coating 122 on the negative electrode side can cover the connection position between the outer peripheral surface of the housing 11 and the negative end face of the housing 11, thereby improving the insulation and protection performance of the outer insulating layer 12.

[0057] In one specific embodiment, such as Figures 4 to 6 As shown, insulating tape 121 is disposed on the outer peripheral surface of housing 11. Insulating tape 121 has a single insulating coating 122 on both sides along the axial direction of housing 11. The insulating coating 122 includes a first coating portion 1221 and a second coating portion 1222. The first coating portion 1221 located on the positive electrode side and the first coating portion 1221 located on the negative electrode side are in contact with the two sides of insulating tape 121. The second coating portion 1222 located on the positive electrode side is located on the positive end face of housing 11, and the second coating portion 1222 located on the negative electrode side is located on the negative end face of housing 11.

[0058] In another specific embodiment, such as Figures 7 to 9 As shown, the insulating tape 121 includes a first tape portion 1211 and a second tape portion 1212. The first tape portion 1211 is disposed on the outer peripheral surface of the housing 11, and the second tape portion 1212 is disposed on the negative end face of the housing 11. The positive end face of the housing 11 is provided with an insulating coating 122, which includes a first coating portion 1221 and a second coating portion 1222. The first coating portion 1221 is disposed on the outer peripheral surface of the housing 11 and is in contact with the first tape portion 1211, and the second coating portion 1222 is disposed on the positive end face of the housing 11.

[0059] In another specific embodiment, such as Figures 10 to 12 As shown, the insulating tape 121 includes a first tape portion 1211 and a second tape portion 1212. The first tape portion 1211 is disposed on the outer peripheral surface of the housing 11, and the second tape portion 1212 is disposed on the positive end face of the housing 11. The negative end face of the housing 11 is provided with an insulating coating 122, which includes a first coating portion 1221 and a second coating portion 1222. The first coating portion 1221 is disposed on the outer peripheral surface of the housing 11 and is in contact with the first tape portion 1211, and the second coating portion 1222 is disposed on the negative end face of the housing 11.

[0060] According to some embodiments of this utility model, the contact points of the insulating tape 121 and the insulating coating 122 overlap. Therefore, the overlapping portion of the insulating tape 121 and the insulating coating 122 prevents gaps between them, thus avoiding insulation failure caused by such gaps and improving the insulation protection performance of the outer insulating layer 12.

[0061] In some embodiments, the overlap width between the insulating tape 121 and the insulating coating 122 along the axial direction of the housing 11 is no greater than 10 mm. A larger overlap width results in a larger overlap area between the insulating tape 121 and the insulating coating 122, leading to increased production costs for both. Therefore, by controlling the overlap width between the insulating tape 121 and the insulating coating 122 to no more than 10 mm, excessively large overlap areas can be avoided, preventing increased production costs for both the insulating tape 121 and the insulating coating 122, thereby effectively controlling the production cost of the outer insulation layer 12.

[0062] In some embodiments, the portion of the insulating tape 121 that overlaps with the insulating coating 122 is located on the side of the insulating coating 122 that faces away from the housing 11. This ensures that the insulating coating 122 can adhere better to the housing 11 and prevents the insulating coating 122 from peeling off due to weak adhesion of the insulating tape 121.

[0063] According to some embodiments of this utility model, such as Figure 13 As shown, the insulating coating 122 includes a bonding coating 1223 and an outer coating 1224. The bonding coating 1223 is located between the outer coating 1224 and the outer surface of the housing 11. That is, the outer coating 1224 is connected to the housing 11 through the bonding coating 1223. For example, the bonding coating 1223 can be made of a material compatible with both the outer coating 1224 and the housing 11, thus ensuring a firm connection between the bonding coating 1223 and both the outer coating 1224 and the housing 11. Therefore, by providing the bonding coating 1223 between the housing 11 and the outer coating 1224, the adhesion of the insulating coating 122 to the housing 11 can be significantly improved, thereby preventing the insulating coating 122 from peeling off and improving its reliability.

[0064] According to some embodiments of this utility model, the bonding coating 1223 includes a polyurethane layer. By setting the bonding coating 1223 as a polyurethane layer, the polyurethane layer can bond with the active groups on the surface of the outer coating 1224 through its own amino and other active groups. Simultaneously, the bonding coating 1223 is anchored to the micro-recessed structure on the surface of the outer coating 1224, improving the adhesion of the bonding coating 1223 to the surface of the outer coating 1224 without roughening. This solves the problem of low adhesion of the insulating coating 122 on the unroughened housing 11, and improves the insulation and protective performance of the outer insulating layer 12.

[0065] In some embodiments, the outer coating 122 is a thermosetting resin layer, such as phenolic resin, epoxy resin, polyurethane, etc.

[0066] It should be noted that the outer coating 1224 and the bonding coating 1223 can be made of the same material. The same material means that the outer coating 1224 and the bonding coating 1223 have the same main material. For example, both the outer coating 1224 and the bonding coating 1223 can be polyurethane layers, but they can be formed under different molding conditions and with different additive compositions.

[0067] According to some embodiments of this utility model, the outer coating 1224 includes either a polyepoxy resin layer or a polyacrylate layer. By setting the outer coating 1224 as either a polyepoxy resin layer or a polyacrylate layer, the polyepoxy resin or polyacrylate can bond with the polyurethane through intermolecular hydrogen bonds, thereby improving the bonding strength between the outer coating 1224 and the bonding coating 1223, ensuring that the outer coating 1224 is firmly adhered to the shell 11, thus improving the insulation and protective performance of the shell 1. Furthermore, the polyurethane layer, polyacrylate layer, and polyepoxy resin layer have good thermal stability, with a thermal weight loss ratio ≤10% at 200℃, ensuring good insulation and protective performance of the shell 1 under thermal runaway temperatures of 160~180℃. Moreover, the thermal conductivity of the polyurethane layer and polyacrylate layer is ≥0.30W / (m·K), which is better than the 0.2W / (m·K) of existing products.

[0068] The battery device according to a second aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0069] The battery device according to a second aspect of the present invention includes: a cylindrical battery 100.

[0070] According to the battery device of the second aspect of the present invention, the outer insulating layer 12 covers the outer surface of the housing 11 and includes insulating tape 121 and insulating coating 122. The insulating coating 122 can be firmly attached to the outer surface of the housing 11 and has excellent scratch resistance, thereby improving the insulating and protective performance of the outer insulating layer 12. Furthermore, the low cost of the insulating tape 121 can reduce the production cost of the outer insulating layer 12, thereby improving the reliability of the cylindrical battery 100 and reducing the production cost of the cylindrical battery 100.

[0071] The following description, with reference to the accompanying drawings, describes an electrical device according to a third aspect of the present invention.

[0072] An electrical device according to a third aspect of the present invention includes: a battery device.

[0073] According to the third aspect of the present invention, the electrical device has an outer insulating layer 12 covering the outer surface of the housing 11 and includes an insulating adhesive tape 121 and an insulating coating 122. The insulating coating 122 can be firmly attached to the outer surface of the housing 11 and has excellent scratch resistance, thereby improving the insulation and protection performance of the outer insulating layer 12. Furthermore, the low cost of the insulating adhesive tape 121 can reduce the production cost of the outer insulating layer 12, thereby improving the reliability of the cylindrical battery 100 and reducing the production cost of the cylindrical battery 100.

[0074] In some embodiments, the electrical device is a vehicle, which includes an electric drive system and a battery device for supplying electrical energy to the electric drive system to drive the vehicle.

[0075] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cylindrical battery, characterized in that, comprises: a housing, the housing comprising a casing and an outer insulating layer, the outer insulating layer covering the outer surface of the casing and comprising insulating adhesive paper and an insulating coating, at least a part of the insulating adhesive paper and at least a part of the insulating coating both covering the outer peripheral surface of the casing, and along the axial direction of the casing, the insulating coating is located on at least one side of the insulating adhesive paper and is in contact with the insulating adhesive paper; an electrode assembly, disposed inside the housing.

2. The cylindrical battery according to claim 1, characterized in that, The coverage area of the insulating coating on the outer peripheral surface of the casing is smaller than the coverage area of the insulating adhesive paper on the outer peripheral surface of the casing.

3. The cylindrical battery according to claim 2, characterized in that, The ratio of the coverage area of the insulating coating on the outer peripheral surface of the casing to the coverage area of the insulating adhesive paper on the outer peripheral surface of the casing ranges from 1% to 50%.

4. The cylindrical battery according to claim 1, characterized in that, The thickness T1 of the insulating coating and the thickness T2 of the insulating adhesive paper satisfy: 0.001mm≤T1≤1mm, 0.001mm≤T2≤1mm; and / or, 0≤|T1-T2| / T1≤3.

5. The cylindrical battery according to claim 1, characterized in that, Along the axial direction of the casing, the insulating coating located on the same side of the insulating adhesive paper is a single said insulating coating, the single insulating coating comprises a first coating portion disposed on the outer peripheral surface of the casing, and the first coating portion is in contact with the insulating adhesive paper; wherein, along the axial direction of the casing, the height H1 of the first coating portion and the height H2 of the casing satisfy: 0.01≤H1 / H2≤0.3; and / or, a rolling groove is formed on the outer peripheral surface of the casing, and the first coating portion covers the rolling groove.

6. The cylindrical battery according to claim 1, characterized in that, Along the axial direction of the casing, the insulating coating located on the same side of the insulating adhesive paper is a single said insulating coating, the single insulating coating comprises a first coating portion and a second coating portion, the first coating portion is disposed on the outer peripheral surface of the casing and is in contact with the insulating adhesive paper, the second coating portion is disposed on the axial end face of the casing and is connected to the first coating portion, and the connection position of the first coating portion and the second coating portion is located at the junction of the outer peripheral surface of the casing and the axial end face of the casing.

7. The cylindrical battery according to claim 6, characterized in that, The area S1 of the projection of the second coating portion on a reference surface and the projection area S2 of the axial end face of the casing on the reference surface satisfy: 0.01≤S1 / S2≤0.5, and the reference surface is perpendicular to the axial direction of the casing; and / or, the second coating portion is annular.

8. The cylindrical battery according to claim 6, characterized in that, Along the axial direction of the casing, the insulating coating is located on one side of the insulating adhesive paper, the second coating portion is disposed on one of the axial end faces of the casing, the insulating adhesive paper comprises a first adhesive paper portion and a second adhesive paper portion, the first adhesive paper portion covers the outer peripheral surface of the casing and is in contact with the first coating portion, the second adhesive paper portion is disposed on the other axial end face of the casing and is connected to the first adhesive paper portion, and the connection position of the first adhesive paper portion and the second adhesive paper portion is located at the junction of the outer peripheral surface of the casing and the axial end face of the casing; or, along the axial direction of the casing, the insulating coating is located on both sides of the insulating adhesive paper.

9. The cylindrical battery according to claim 1, characterized in that, The contact position of the insulating adhesive paper and the insulating coating overlaps; Wherein, along the axial direction of the housing, the overlap width between the insulating tape and the insulating coating is no more than 10 mm; and / or, the portion of the insulating tape overlapping the insulating coating is located on the side of the insulating coating away from the housing.

10. The cylindrical battery according to any one of claims 1-9, characterized in that, The insulating coating includes a bonding coating and an outer coating, wherein the bonding coating is located between the outer coating and the outer surface of the housing.

11. The cylindrical battery according to claim 10, characterized in that, The bonding coating includes a polyurethane layer; and / or, the outer coating includes either a polyepoxy resin layer or a polyacrylate layer.

12. A battery device, characterized in that, include: The cylindrical battery according to any one of claims 1-11.

13. An electrical appliance, characterized in that, include: The battery device according to claim 12.

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