Cylindrical battery and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery and a battery device, the cylindrical battery comprises a battery shell and an insulating coating, the battery shell comprises two opposite end walls and a peripheral wall connected between the two end walls; the insulating coating is at least partially formed on the outer surface of the peripheral wall, the insulating coating comprises a first insulating coating and a second insulating coating which are located in different areas of the peripheral wall, and the thickness of the second insulating coating is larger than that of the first insulating coating. The insulating coating not only can improve the insulating effect of the cylindrical battery, but also can ensure the heat dissipation efficiency of the cylindrical battery.

Description

Technical Field

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

[0002] In the related art, an insulating layer needs to be provided on the outer surface of cylindrical batteries to prevent adjacent cylindrical batteries from short-circuiting. However, if the thickness of the insulating layer is too thick, the heat dissipation efficiency of the cylindrical batteries will be poor, and if the thickness of the insulating layer is too thin, adjacent cylindrical batteries will be easily short-circuited.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a cylindrical battery, which can solve the technical problem that adjacent cylindrical batteries are easily short-circuited, and can also solve the technical problem that the cylindrical battery is not easy to dissipate heat.

[0005] Cylindrical batteries include:

[0006] A battery housing, the battery housing comprising two oppositely disposed end walls and a peripheral wall connected between the two end walls;

[0007] The insulating coating is at least partially formed on the outer surface of the peripheral wall. The insulating coating includes a first insulating coating and a second insulating coating located in different areas of the peripheral wall. The thickness of the second insulating coating is greater than that of the first insulating coating.

[0008] The utility model forms a thicker second insulating coating on a local area of ​​the battery housing peripheral wall, and forms a thinner first insulating coating on other areas of the peripheral wall. The thicker second insulating coating can increase the creepage distance between adjacent cylindrical batteries, thereby reducing the risk of short circuits between adjacent cylindrical batteries; the thinner first insulating coating can facilitate heat dissipation of the cylindrical battery.

[0009] The utility model also provides a battery device, which includes the above-mentioned cylindrical battery, and the peripheral walls of adjacent cylindrical batteries are arranged opposite to each other.

[0010] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0012] in:

[0013] Figure 1 It is a structural schematic diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0014] Figure 2 for Figure 1 The schematic diagram of the structure of the cylindrical battery before the insulating coating is formed;

[0015] Figure 3 It is a structural schematic diagram of another exemplary embodiment of the cylindrical battery disclosed in the present invention;

[0016] Figure 4 It is a structural schematic diagram of another exemplary embodiment of the cylindrical battery disclosed in the present invention;

[0017] Figure 5 It is a structural schematic diagram of another exemplary embodiment of the cylindrical battery disclosed in the present invention;

[0018] Figure 6 It is a structural schematic diagram of another exemplary embodiment of the cylindrical battery disclosed in the present invention;

[0019] Figure 7 for Figure 6 A cross-sectional view of the cylindrical battery shown along its axial direction;

[0020] Figure 8 It is a structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0021] Fig. 9 It is a schematic structural diagram of an exemplary embodiment of a battery device disclosed in the present invention.

[0022] Description of reference numerals:

[0023] 1. Battery case; 11. End wall; 111. First end wall; 112. Second end wall; 12. Peripheral wall; 13. Cover plate; 2. Insulation coating; 21. First insulation coating; 22. Second insulation coating; 221. First side; 3. Main case; 31. Bottom wall; 41. Cell body; 51. Bottom plate. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0025] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0026] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0027] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0028] like Figure 1 , 2 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 2 for Figure 1 The schematic diagram of the structure of the cylindrical battery shown is before the insulating coating is formed.

[0029] The cylindrical battery comprises: a battery case 1 and an insulating coating 2. The battery case 1 comprises two oppositely disposed end walls 11 and a peripheral wall 12 connected between the two end walls; at least part of the insulating coating 2 is formed on the outer surface of the peripheral wall 12, and the insulating coating 2 comprises a first insulating coating 21 and a second insulating coating 22 located in different regions of the peripheral wall 12, and the thickness of the second insulating coating 22 is greater than the thickness of the first insulating coating 21.

[0030] This exemplary embodiment forms a thicker second insulating coating on a local area of ​​the battery housing peripheral wall, and forms a thinner first insulating coating on other areas of the peripheral wall. The thicker second insulating coating can increase the creepage distance between adjacent cylindrical batteries, thereby reducing the risk of short circuits between adjacent cylindrical batteries; the thinner first insulating coating can facilitate heat dissipation of the cylindrical batteries.

[0031] It should be noted that the battery housing may further include an arc-shaped transition portion connected between the peripheral wall 12 and the end wall 11 , and the peripheral wall 12 does not include the arc-shaped transition portion.

[0032] In this exemplary embodiment, Figure 1 , 2 As shown, the two end walls 11 include a first end wall 111 and a second end wall 112, and the second insulating coating 22 extends from one end of the peripheral wall 12 close to the first end wall 111 to one end of the peripheral wall 12 close to the second end wall 112. That is, the peripheral wall 12 has the second insulating coating 22 in the axial direction X of the cylindrical battery, and this arrangement can make the cylindrical battery have good insulation performance at all positions in its axial direction.

[0033] In this exemplary embodiment, the thickness of the first insulating coating and the second insulating coating can be adjusted by controlling the spraying amount of the insulating coating material. For example, in the same area, the insulating coating material forming the second insulating coating is more than the insulating coating material of the first insulating coating. In addition, the thickness of the first insulating coating and the second insulating coating can be controlled by controlling the number of spraying times of the insulating coating. For example, the number of spraying times of the second insulating coating can be controlled to be greater than the number of spraying times of the first insulating coating. In this exemplary embodiment, Figure 1 , 2 As shown, the second insulating coating 22 extends linearly from one end of the peripheral wall 12 close to the first end wall 111 to one end of the peripheral wall 12 close to the second end wall 112. This arrangement allows the second insulating coating 22 to have a shorter extension length, thereby saving the material of the insulating coating and facilitating the molding of the second insulating coating 22.

[0034] In this exemplary embodiment, Figure 1 , 2As shown, the second insulating coating 22 includes a first side 221 extending in a straight line along the axial direction X of the cylindrical battery, and the first side 221 is perpendicular to the end wall 11. Another side 222 of the second insulating coating 22 opposite to the first side 221 can also extend in a straight line along the height of the cylindrical battery and be perpendicular to the end wall 11.

[0035] It should be understood that in other exemplary embodiments, the second insulating coating 22 may also extend from one end of the peripheral wall 12 close to the first end wall 111 to one end of the peripheral wall 12 close to the second end wall 112 in other ways. Figure 3 As shown in FIG. 1 , which is a schematic structural diagram of another exemplary embodiment of the cylindrical battery disclosed in the present invention, the second insulating coating 22 can also extend in a curve from one end of the peripheral wall 12 close to the first end wall 111 to one end of the peripheral wall 12 close to the second end wall 112. For another example, Figure 4 FIG. 2 is a schematic diagram of the structure of another exemplary embodiment of a cylindrical battery disclosed in the present invention, in which the second insulating coating 22 can also spirally extend from one end of the peripheral wall 12 close to the first end wall 111 to one end of the peripheral wall 12 close to the second end wall 112. The curved and spirally extended second insulating coating can increase the coverage of the second insulating coating in the circumferential direction of the battery housing, thereby improving the insulation effect of the cylindrical battery in more directions.

[0036] like Figure 5 , which is a schematic diagram of the structure of another exemplary embodiment of the cylindrical battery disclosed in the present invention, the second insulating coating 22 can be arranged at intervals along the axial direction of the cylindrical battery. This arrangement can not only make the cylindrical battery have better insulation performance at more positions in its axial direction, but also reduce the coverage area of ​​the second insulating coating 22, thereby improving the heat dissipation efficiency of the cylindrical battery.

[0037] In this exemplary embodiment, Figure 1 , 3 As shown in Figures 4 and 5, the extension width of the second insulating coating 22 in the circumferential direction of the peripheral wall 12 is L, the diameter of the cylindrical battery is D, and L / D is 0.04-0.09. For example, L / D can be equal to 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, etc. If the ratio of L / D is too small, the extension width of the second insulating coating 22 is too small. When the battery shell is deformed by the expansion force of the battery cell, the extension width of the second insulating coating 22 in the circumferential direction of the peripheral wall 12 will be further reduced, so that the cylindrical battery loses its good insulation effect; if the ratio of L / D is too large, the width of the second insulating coating 22 is too large, and the heat dissipation efficiency of the cylindrical battery is poor. This exemplary embodiment sets L / D to a suitable size, which can not only ensure the insulation effect of the cylindrical battery, but also improve the heat dissipation efficiency of the cylindrical battery.

[0038] It should be noted that the extension width of the second insulating coating 22 in the circumferential direction of the peripheral wall 12 is: the width of the second insulating coating 22 in a direction perpendicular to the axial direction of the cylindrical battery after the second insulating coating 22 is flattened. The method for measuring the extension width of the second insulating coating 22 in the circumferential direction of the peripheral wall 12 may include: cutting the housing in the area provided with the second insulating coating, flattening it, and then measuring the width of the second insulating coating.

[0039] like Figure 1 , 3 -5, the second insulating coating 22 is a single strip. It should be understood that, in other exemplary embodiments, the insulating coating may include a plurality of second insulating coatings extending from the first end wall 111 to the second end wall 112.

[0040] like Figure 6 As shown, it is a schematic diagram of the structure of another exemplary embodiment of the cylindrical battery disclosed in the present invention, and the second insulating coating 22 can be arranged around the outer peripheral surface of the peripheral wall 12. That is, the second insulating coating 22 forms an annular structure along the outer peripheral surface of the peripheral wall 12. This arrangement can not only reduce the risk of short circuit of the cylindrical battery, but also improve the efficiency of heat dissipation of the cylindrical battery. In addition. A thicker second insulating coating is formed around the cylindrical battery, and the creepage distance of adjacent batteries can be increased regardless of how the battery is placed.

[0041] like Figure 7 As shown, Figure 6 The cylindrical battery is shown in a cross-sectional view along its axial direction. The cylindrical battery also includes: a battery cell, the battery cell includes a battery cell body 41 and a pole ear connected to one side of the battery cell body 41; in the axial direction of the battery, the distance S between the end wall 11 of the battery shell 1 close to the pole ear and the second insulating coating 22 is greater than or equal to 2mm. For example, S can be equal to 2mm, 3mm, 4mm, 5mm, etc. The heat generated at the pole ear in the cylindrical battery is relatively large. In this exemplary embodiment, the second insulating coating 22 is arranged away from the pole ear, so that the influence of the second insulating coating 22 on the heat dissipation of the cylindrical battery can be reduced.

[0042] In this exemplary embodiment, Figure 6As shown, the ratio of the size h1 of the second insulating coating 22 in the axial direction X of the cylindrical battery and the height h2 of the battery shell 1 in the axial direction X is 0.02-0.06. For example, h1 / h2 can be equal to 0.02, 0.03, 0.04, 0.05, 0.06, etc. If the ratio h1 / h2 is too small, the width of the second insulating coating 22 is too small. When the battery shell is deformed by the expansion force of the battery cell, the extension width of the second insulating coating 22 in the circumferential direction of the peripheral wall 12 will be further reduced, so that the cylindrical battery loses its good insulation effect; if the ratio h1 / h2 is too large, the width of the second insulating coating 22 is too large, and the heat dissipation efficiency of the cylindrical battery is poor. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can not only ensure the insulation effect of the cylindrical battery, but also improve the heat dissipation efficiency of the cylindrical battery.

[0043] In this exemplary embodiment, Figure 1 , 3 -7, the ratio of the thickness of the second insulating coating 22 to the thickness of the first insulating coating 21 is greater than or equal to 1 and less than or equal to 2. For example, the ratio of the thickness of the second insulating coating 22 to the thickness of the first insulating coating 21 can be equal to 1, 1.5, 2, etc. If the ratio of the thickness of the second insulating coating 22 to the thickness of the first insulating coating 21 is too large, the thickness of the second insulating coating 22 is too large, and the heat dissipation efficiency of the cylindrical battery is poor; if the ratio of the thickness of the second insulating coating 22 to the thickness of the first insulating coating 21 is too small, the thickness of the second insulating coating 22 is too small, and the insulation effect of the cylindrical battery is poor. This exemplary embodiment sets the ratio of the thickness of the second insulating coating 22 to the thickness of the first insulating coating 21 to an appropriate size. This setting can not only ensure the insulation effect of the cylindrical battery, but also improve the heat dissipation efficiency of the cylindrical battery.

[0044] In this exemplary embodiment, Figure 1-7 As shown, the battery housing 1 may include: an integrally formed main housing 3, the main housing 3 including a bottom wall 31 and a peripheral wall 12, an opening is formed on the main housing 3, the bottom wall 31 and the opening are arranged opposite to each other, an opening is formed at one end of the peripheral wall 12 away from the bottom wall 31, and the bottom wall 31 forms an end wall of the battery housing 1; a portion of the insulating coating 2 is formed on the bottom wall 31. The insulating coating 2 can prevent the bottom wall 31 from short-circuiting with other structures.

[0045] In this exemplary embodiment, Figure 1 , 3-7, the insulating coating 2 covers all outer surfaces of the bottom wall 31, and the insulating coating 2 covers all outer surfaces of the peripheral wall 12. That is, there is no blank area on the outer surface of the bottom wall 31 and the outer surface of the peripheral wall 12. The outer surface of the main shell is provided with an insulating coating to ensure the insulation performance of the shell body; in addition, since the shell body is provided with an insulating coating, there is no need to set other additional insulating parts, which simplifies the process. For example, it is traditional to set a blank area at the open end of the shell body. After the shell body and the end wall are welded, a separate insulating part, such as an insulating film, is set at the opening position of the shell body for secondary insulation.

[0046] In this exemplary embodiment, Figure 1-7 As shown, the battery housing 1 further includes: a cover plate 13, which is welded to the opening of the main housing 3, and the cover plate 13 forms an end wall. The insulating coating 2 is not formed at the position 8 where the cover plate 13 and the main housing 3 are welded. This arrangement can prevent the insulating coating from affecting the welding effect of the battery housing.

[0047] In this exemplary embodiment, the insulating coating 2 can be formed on the outer surface of the battery housing by spraying, coating, electrophoresis, etc. The insulating coating 2 can be formed more evenly on the outer surface of the battery housing 1, and the insulating coating 2 will not form wrinkles at the corners of the battery housing. In this exemplary embodiment, the insulating coating can be a polyethylene (PE) coating, a polyurethane (PU) coating, an epoxy (EP) coating, a potassium silicate coating, a siloxane coating, etc.

[0048] In this exemplary embodiment, the battery housing 1 may include aluminum, for example, the battery housing 1 may be an aluminum shell or an aluminum alloy shell. In other exemplary embodiments, the battery housing 1 may also be made of other materials.

[0049] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged.

[0050] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0051] This exemplary embodiment also provides a battery device, the battery device includes the above cylindrical battery, such as Figure 8 , which is a schematic diagram of the structure of an exemplary embodiment of the battery device disclosed in the present invention. The battery device further includes: a bottom plate 51 , the bottom plate 51 is used to support the cylindrical battery; the axial direction of the cylindrical battery 10 is perpendicular to the bottom plate 51 .

[0052] It should be understood that in other exemplary embodiments, Fig. 9 As shown, it is a schematic diagram of the structure of an exemplary embodiment of the battery device of the present disclosure. The axial direction of the cylindrical battery can also be parallel to the bottom plate 51. When the battery device is subjected to vibration, the battery is prone to positional movement, and the distance between adjacent batteries may be too close, and the creepage distance is insufficient. By arranging adjacent second insulating coatings relative to each other, the insulation distance is increased. In this exemplary embodiment, the peripheral walls of two adjacent cylindrical batteries are arranged relative to each other, and in two adjacent cylindrical batteries, the second insulating coating of at least one cylindrical battery and the peripheral wall of the other cylindrical battery are arranged relative to each other.

[0053] In this exemplary embodiment, the peripheral walls 12 of two adjacent cylindrical batteries are arranged oppositely, and the second insulating coatings 22 of at least part of the two adjacent cylindrical batteries are arranged oppositely. This arrangement can greatly reduce the risk of short circuits between adjacent cylindrical batteries. The adjacent second insulating coatings of the cylindrical batteries are arranged oppositely to form a distance of at least two second insulating coating thicknesses between the adjacent batteries, thereby increasing the insulation effect between the adjacent batteries.

[0054] The battery device proposed in the utility model can be used in various electrical devices, such as mobile phones, portable devices, laptops, various vehicles (such as battery cars, electric cars, etc.), ships, spacecraft, electric toys and electric tools, etc. Further, the above-mentioned spacecraft may include, for example, airplanes, rockets, space shuttles and spacecrafts. The above-mentioned electric toys may include, for example, fixed or mobile electric toys (such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.). The above-mentioned electric tools may include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers. It should be understood that in various possible embodiments that conform to the design concept of the utility model, the cylindrical battery or battery device proposed in the utility model is not limited to the above-described devices, but can also be applied to all devices using batteries. For the sake of simplicity, the various embodiments in this specification are described by taking vehicles as an example.

[0055] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0056] The battery module includes a plurality of batteries, which may be cylindrical batteries. The cylindrical batteries may be arranged on a support plate (bottom plate) to form a battery module.

[0057] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0058] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0059] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0060] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0061] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cylindrical battery, characterized in that: The cylindrical battery comprises: A battery housing (1), the battery housing (1) comprising two oppositely disposed end walls (11) and a peripheral wall (12) connected between the two end walls; An insulating coating (2) is at least partially formed on the outer surface of the peripheral wall (12), the insulating coating (2) comprising a first insulating coating (21) and a second insulating coating (22) located in different areas of the peripheral wall (12), the thickness of the second insulating coating (22) being greater than the thickness of the first insulating coating (21).

2. The cylindrical battery according to claim 1, characterized in that: The two end walls include a first end wall (111) and a second end wall (112), and the second insulating coating (22) extends from an end of the peripheral wall (12) close to the first end wall (111) to an end of the peripheral wall (12) close to the second end wall (112).

3. The cylindrical battery according to claim 2, characterized in that: The second insulating coating (22) extends linearly from one end of the peripheral wall (12) close to the first end wall (111) to one end of the peripheral wall (12) close to the second end wall (112); The second insulating coating (22) comprises a first side edge extending in a straight line along the axial direction of the cylindrical battery, and the first side edge is perpendicular to the end wall (11).

4. The cylindrical battery according to claim 2, characterized in that: The extension width of the second insulating coating (22) in the circumferential direction of the peripheral wall (12) is L, the diameter of the cylindrical battery is D, and the ratio of L / D is 0.04-0.

09.

5. The cylindrical battery according to claim 1, characterized in that: The second insulating coatings (22) are arranged at intervals along the axial direction of the cylindrical battery.

6. The cylindrical battery according to claim 1, characterized in that: The second insulating coating (22) is arranged around the outer peripheral surface of the peripheral wall (12).

7. The cylindrical battery according to claim 6, characterized in that: The cylindrical battery also includes: A battery cell, the battery cell comprising a battery cell body (41) and a pole ear connected to one side of the battery cell body (41); In the axial direction of the cylindrical battery, the distance between the end wall of the battery housing (1) close to the pole lug and the second insulating coating (22) is greater than or equal to 2 mm.

8. The cylindrical battery according to claim 6, characterized in that: The ratio of the dimension of the second insulating coating (22) in the axial direction of the cylindrical battery to the height of the battery housing (1) in the axial direction thereof is 0.02-0.

06.

9. The cylindrical battery according to any one of claims 1 to 8, characterized in that: The ratio of the thickness of the second insulating coating (22) to the thickness of the first insulating coating (21) is greater than 1 and less than or equal to 2.

10. A battery device, characterized in that: The battery device comprises a cylindrical battery according to any one of claims 1 to 9; The battery device further comprises: A bottom plate (51) for supporting the cylindrical battery; The axial direction of the cylindrical battery is parallel to the bottom plate (51), the peripheral walls (12) of two adjacent cylindrical batteries are arranged opposite to each other, and in the two adjacent cylindrical batteries, the second insulating coating (22) of at least one cylindrical battery and the peripheral wall of the other cylindrical battery are arranged opposite to each other.

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