Battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, which comprises a plurality of cylindrical batteries, and the cylindrical batteries comprise battery shells and insulating coatings formed on the outer surfaces of the battery shells; wherein the minimum distance between the adjacent cylindrical batteries is h1, the thickness of the insulating coating is d, and d * h1 is 0.04 mm < 2 >-0.64 mm < 2 >. The battery device can improve the insulation effect between the cylindrical batteries on the premise of ensuring the energy density of the battery device.

Description

Technical Field

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

[0002] In the related art, a battery device includes a plurality of batteries, and short circuits are likely to occur between adjacent batteries.

[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 battery device, which can improve the technical problem that adjacent batteries are prone to short circuit.

[0005] The battery unit includes:

[0006] A plurality of cylindrical batteries, each of which comprises a battery housing and an insulating coating formed on an outer surface of the battery housing;

[0007] Among them, the minimum distance between adjacent cylindrical batteries is h1, the thickness of the insulating coating is d, and d*h1 is 0.04mm 2 -0.64mm 2 .

[0008] In the present invention, the insulation performance between adjacent batteries can be guaranteed by comprehensively adjusting the relationship between h1 and d. When the minimum distance h1 between adjacent cylindrical batteries is too small, short circuits are likely to occur between the cylindrical batteries. The present invention limits d*h1 to be greater than 0.04 mm. 2 , that is, the thickness d of the insulating coating is set larger, which can reduce the risk of short circuit between adjacent cylindrical batteries; when the thickness d of the insulating coating is too small, short circuit between cylindrical batteries is also prone to occur. The utility model limits d*h1 to be greater than 0.04mm 2 , that is, the minimum distance h1 between adjacent cylindrical batteries is set larger, and this setting can also reduce the risk of short circuit between adjacent cylindrical batteries. In addition, d*h1 is too large, h1 is too large and / or d is too large. When h1 is too large, the space utilization rate inside the battery device is low, and the energy density of the battery device is low; when d is too large, the cylindrical battery is not easy to dissipate heat and the coating process of the insulating coating takes a long time. The utility model sets d*h1 to a suitable range, which can not only reduce the risk of short circuit between adjacent cylindrical batteries, but also increase the energy density of the battery device, increase the heat dissipation speed of the cylindrical battery, and increase the coating rate of the insulating coating.

[0009] 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

[0010] 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.

[0011] in:

[0012] Figure 1 It is a structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0013] Figure 2 for Figure 1 A cross-sectional view of the battery device along the dashed line AA;

[0014] Figure 3 for Figure 2 a side view of the battery device shown;

[0015] Figure 4 for Figure 3 An enlarged view of a local area B of the battery device shown;

[0016] Figure 5 This is a schematic structural diagram of a cylindrical battery before being coated with an insulating coating in an exemplary embodiment of a battery device disclosed herein;

[0017] Figure 6 This is a schematic diagram of the structure of a cylindrical battery after being coated with an insulating coating in an exemplary embodiment of the battery device disclosed herein;

[0018] Figure 7 It is a partial structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0019] Figure 8 FIG. 4 is a schematic structural diagram of another exemplary embodiment of a battery device disclosed herein.

[0020] Description of reference numerals:

[0021] Tag Name

[0022] 1. Cylindrical battery; 11. Battery shell; 111. End wall; 1111. First end wall; 112. Peripheral wall; 2. Insulating coating; 3. Main shell; 31. Bottom wall; 32. Arc chamfered portion; 4. Battery case; 41. Bottom plate; 5. Battery layer; 6. Battery array; 8. Welding position. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] like Figure 1-6 As shown, Figure 1 is a schematic structural diagram of an exemplary embodiment of a battery device disclosed herein. Figure 2 for Figure 1 The cross-sectional view of the battery device shown along the dashed line AA, Figure 3 for Figure 2 A side view of the battery device shown, Figure 4 for Figure 3 An enlarged view of a local area B of the battery device is shown, Figure 5 This is a schematic diagram of the structure of a cylindrical battery before being coated with an insulating coating in an exemplary embodiment of the battery device disclosed herein. Figure 6It is a schematic diagram of the structure of a cylindrical battery after being coated with an insulating coating in an exemplary embodiment of the battery device disclosed herein.

[0028] The battery device includes: a plurality of cylindrical batteries 1, wherein the cylindrical battery 1 includes a battery housing 11 and an insulating coating 2 formed on the outer surface of the battery housing 11; wherein the minimum distance between adjacent cylindrical batteries 1 is h1, the thickness of the insulating coating 2 is d, and d*h1 is 0.04 mm 2 -0.64mm 2 .

[0029] In this exemplary embodiment, when the minimum distance h1 between adjacent cylindrical batteries 1 is too small, short circuits are likely to occur between the cylindrical batteries 1. This exemplary embodiment limits d*h1 to be greater than 0.04 mm. 2 , that is, the thickness d of the insulating coating 2 is set larger, which can reduce the risk of short circuit between adjacent cylindrical batteries 1; when the thickness d of the insulating coating 2 is too small, short circuit between cylindrical batteries 1 is also likely to occur. This exemplary embodiment limits d*h1 to be greater than 0.04 mm 2 , that is, the minimum distance h1 between adjacent cylindrical batteries is set larger, which can also reduce the risk of short circuit of adjacent cylindrical batteries 1. In addition, d*h1 is too large, h1 is too large and / or d is too large. When h1 is too large, the space utilization rate inside the battery device is low, and the energy density of the battery device is low; when d is too large, the cylindrical battery is not easy to dissipate heat and the coating process of the insulating coating takes a long time. This exemplary embodiment sets d*h1 to a suitable range, which can not only reduce the risk of short circuit of adjacent cylindrical batteries 1, but also increase the energy density of the battery device, increase the heat dissipation speed of the cylindrical battery 1, and increase the coating rate of the insulating coating.

[0030] It should be noted that in this exemplary embodiment, the minimum distance between adjacent cylindrical batteries 1 is the minimum distance between the insulating coatings on the outer surfaces of adjacent cylindrical batteries 1. The minimum distances between different groups of adjacent cylindrical batteries 1 may be the same or different. The minimum distance between adjacent cylindrical batteries 1 is L1-L2-2*L3, where L1 is the distance between the centers of adjacent cylindrical batteries, L2 is the diameter of the cylindrical battery, and L3 is the thickness of the insulating coating.

[0031] 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 11, 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.

[0032] In this exemplary embodiment, d*h1 may be equal to 0.04 mm.2 , 0.05mm 2 , 0.06mm 2 , 0.07mm 2 、0.08mm 2 , 0.10mm 2 , 0.12mm 2 , 0.14mm 2 , 0.16mm 2 , 0.18mm 2 , 0.20mm 2 , 0.22mm 2 , 0.24mm 2 , 0.26mm 2 , 0.28mm 2 , 0.30mm 2 , 0.32mm 2 , 0.34mm 2 , 0.36mm 2 , 0.38mm 2 , 0.40mm 2 , 0.42mm 2 , 0.44mm 2 , 0.46mm 2 , 0.48mm 2 , 0.5mm 2 , 0.52mm 2 , 0.54mm 2 、0.56mm 2 、0.58mm 2 , 0.6mm 2 、0.62mm 2 , 0.64mm 2 wait.

[0033] In this exemplary embodiment, the battery housing 11 may include two end walls 111 disposed opposite to each other and a peripheral wall 112 connected between the two end walls 111, the peripheral wall 112 and at least one end wall 111 are welded, and the insulating coating 2 is not provided at the welding position 8 between the peripheral wall 112 and the end wall 111, wherein d*h1 is 0.08 mm 2 -0.64mm 2 For example, d*h1 can be equal to 0.08 mm 2 , 0.10mm 2 , 0.12mm 2 , 0.14mm 2 , 0.16mm 2 , 0.18mm 2 , 0.20mm 2 , 0.22mm 2 , 0.24mm2 , 0.26mm 2 , 0.28mm 2 , 0.30mm 2 , 0.32mm 2 , 0.34mm 2 , 0.36mm 2 , 0.38mm 2 , 0.40mm 2 , 0.42mm 2 , 0.44mm 2 , 0.46mm 2 , 0.48mm 2 , 0.5mm 2 , 0.52mm 2 , 0.54mm 2 、0.56mm 2 、0.58mm 2 , 0.6mm 2 、0.62mm 2 , 0.64mm 2 Etc. Controlling the d*h1 range to a larger extent can reduce the risk of short circuit in the welding area.

[0034] In this exemplary embodiment, the battery housing 11 may first form an insulating coating 2 on its outer surface, and then weld the peripheral wall and the end wall. By forming the insulating coating first and then welding, when the housing is received, the insulating coating has already been formed on the battery housing, thereby avoiding the need to spray the insulating coating after the battery cell is subsequently assembled into the battery housing, and further avoiding the need to damage the battery cell during the thermal curing process of the insulating coating.

[0035] In this exemplary embodiment, in order to prevent the insulating coating from affecting the welding effect of the battery shell, the insulating coating 2 is not set at the welding position 8 of the peripheral wall 112 and the end wall 111. Accordingly, the welding position 8 of the peripheral wall 112 and the end wall 111 is prone to short circuit with adjacent cylindrical batteries. In order to reduce the risk of short circuit of adjacent cylindrical batteries, this exemplary embodiment sets the range of d*h1 to be larger, that is, by increasing the minimum distance h1 between adjacent cylindrical batteries 1, or increasing the thickness of the insulating coating 2 to reduce the risk of short circuit of adjacent cylindrical batteries. In this exemplary embodiment, a pole assembly can be set on the end wall 111. As the high-voltage output terminal, the pole needs to ensure the insulation gap between adjacent batteries in the area where the insulating coating is not set.

[0036] In the present exemplary embodiment, an insulating coating may be formed on at least a portion of the outer surface of the peripheral wall 112 , and an insulating coating may be formed on at least a portion of the outer surface of the end wall 111 .

[0037] In this exemplary embodiment, the thickness of the insulating coating 2 on the arc chamfered portion 32 is less than the thickness of the insulating coating 2 on the peripheral wall 112, and d*h1 is greater than or equal to 0.06 mm. 2 And less than or equal to 0.64mm 2 For example, d*h1 can be equal to 0.06mm 2 , 0.07mm 2 、0.08mm 2 , 0.10mm 2 , 0.12mm 2 , 0.14mm 2 , 0.16mm 2 , 0.18mm 2 , 0.20mm 2 , 0.22mm 2 , 0.24mm 2 , 0.26mm 2 , 0.28mm 2 , 0.30mm 2 , 0.32mm 2 , 0.34mm 2 , 0.36mm 2 , 0.38mm 2 , 0.40mm 2 , 0.42mm 2 , 0.44mm 2 , 0.46mm 2 , 0.48mm 2 , 0.5mm 2 , 0.52mm 2 , 0.54mm 2 、0.56mm 2 、0.58mm 2 , 0.6mm 2 、0.62mm 2 , 0.64mm 2 In order to ensure the insulation performance at the arc-shaped chamfered portion 32 , when the thickness of the insulating coating on the arc-shaped chamfered portion 32 is relatively thin, the minimum distance between adjacent cylindrical batteries 1 may be appropriately increased.

[0038] In this exemplary embodiment, the minimum distance between two adjacent cylindrical batteries 1 at the welding position of the peripheral wall 112 and the end wall 111 is h2, and h2 / h1 can be greater than 1 and less than or equal to 3. For example, h2 / h1 can be equal to 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, etc. The welding position itself is prone to insulation failure. If h2 / h1 is too small, the minimum distance between two adjacent cylindrical batteries 1 at the welding position of the peripheral wall 112 and the end wall 111 is too small, and the adjacent cylindrical batteries are prone to short circuit; if h2 / h1 is too large, the minimum distance between two adjacent cylindrical batteries 1 at the welding position of the peripheral wall 112 and the end wall 111 is too large, the space utilization rate inside the battery device is low, and the energy density of the battery device is low. In this exemplary embodiment, h2 / h1 is set to a suitable value, which can reduce the risk of short circuit between adjacent cylindrical batteries while ensuring the energy density of the battery device.

[0039] In this exemplary embodiment, Figure 7 , which is a partial structural schematic diagram of an exemplary embodiment of the battery device of the present disclosure. The battery housing 11 may include: an integrally formed main housing 3, the main housing 3 including a bottom wall 31, a peripheral wall 112, and an arc-shaped chamfered portion 32 connected between the bottom wall 31 and the peripheral wall 112, 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 112 away from the bottom wall 31, and the bottom wall 31 forms an end wall of the battery housing.

[0040] In this exemplary embodiment, Figure 1-6 As shown, the battery device also includes: a battery case 4, the battery case 4 includes a bottom plate 41 for supporting the cylindrical battery 1; a plurality of cylindrical batteries 1 form a plurality of battery layers 5, the battery layer 5 includes a plurality of cylindrical batteries 1 distributed in a direction parallel to the bottom plate 41, and the plurality of battery layers 5 are distributed in a direction perpendicular to the bottom plate 41; wherein the cylindrical battery 1 is axially parallel to the bottom plate 41, and at least part of the structure of the cylindrical batteries 1 in the battery layer is embedded in the gap between two adjacent cylindrical batteries 1 in the adjacent battery layer 5. The minimum distance between adjacent cylindrical batteries 1 is slightly smaller, and the thickness of the insulating coating needs to be set larger. Correspondingly, d*h1 is 0.1mm 2 -0.48mm 2 For example, d*h1 can be equal to 0.1 mm 2 , 0.12mm 2 , 0.14mm 2 , 0.16mm 2 , 0.18mm 2 , 0.20mm 2 , 0.22mm 2 , 0.24mm2 , 0.26mm 2 , 0.28mm 2 , 0.30mm 2 , 0.32mm 2 , 0.34mm 2 , 0.36mm 2 , 0.38mm 2 , 0.40mm 2 , 0.42mm 2 , 0.44mm 2 , 0.46mm 2 , 0.48mm 2 wait.

[0041] In this exemplary embodiment, the gap between adjacent cylindrical batteries is 1 mm to 3 mm. For example, the gap between adjacent cylindrical batteries can be 1 mm, 2 mm, 3 mm, etc.

[0042] In this exemplary embodiment, at least part of the structure of some cylindrical batteries 1 is embedded in the gap between two adjacent cylindrical batteries 1 in the adjacent battery layer 5. If the minimum distance h1 between adjacent cylindrical batteries 1 is too large, the number of cylindrical batteries that can be arranged inside the battery device will be relatively small. In this exemplary embodiment, setting d*h1 to an appropriate size can improve the space utilization inside the battery device.

[0043] The bottom plate 41 can directly support the cylindrical battery or indirectly support the cylindrical battery. For example, a support frame can be provided between the bottom plate and the battery to support the battery, and the support frame can be fixedly connected to the bottom plate.

[0044] It should be understood that in other exemplary embodiments, the cylindrical batteries 1 may also have other distribution modes, for example, Figure 8 , which is a schematic diagram of the structure of another exemplary embodiment of the battery device disclosed in the present invention. The axial direction of the cylindrical battery 1 can be perpendicular to the bottom plate 41, and multiple cylindrical batteries 1 form multiple rows of battery columns 6, each row of battery columns 6 includes multiple cylindrical batteries 1 distributed in the same direction, and at least part of the structure of some cylindrical batteries 1 is embedded in the gap between two adjacent cylindrical batteries 1 in the adjacent battery columns.

[0045] In this exemplary embodiment, Figure 1-8As shown, the two end walls 111 include a first end wall 1111, and the battery device further includes: a bus bar 7, the bus bar 7 is used to electrically connect the first end wall 1111, and the overlap area of ​​the orthographic projection of the bus bar 7 on the first end wall 1111 and the first end wall 1111 is S, wherein S / d is 43.8mm-87.5mm. For example, S / d can be equal to 43.8mm, 45mm, 47mm, 49mm, 51mm, 53mm, 55mm, 57mm, 59mm, 61mm, 63mm, 65mm, 67mm, 69mm, 71mm, 73mm, 75mm, 77mm, 79mm, 81mm, 83mm, 85mm, 87.5mm, etc.

[0046] In this exemplary embodiment, the cylindrical battery mainly dissipates heat through the bus 7 and the surrounding wall 112. The larger S is, the better the heat dissipation effect of the cylindrical battery 1 through the bus 7; the smaller the thickness of the insulating coating 2 is, the better the heat dissipation effect of the cylindrical battery through the surrounding wall 112. This exemplary embodiment sets S / d to an appropriate size. When S is too small, d will not be too large; when d is too large, S will not be too small. This setting can ensure that the cylindrical battery has a good heat dissipation effect. This exemplary embodiment sets S / d in an appropriate range and comprehensively adjusts the heat dissipation effect of the end wall and the surrounding wall: when S is relatively large, the heat dissipation effect of the end wall is good, and the thickness of the surrounding wall coating can be set thicker; when S is relatively small, the heat dissipation effect of the end wall is poor, and the thickness of the surrounding wall coating cannot be too large, which is not conducive to the heat dissipation of the surrounding wall.

[0047] In this exemplary embodiment, the battery includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer located on the side of the positive electrode current collector, and the surface density of the positive electrode active material layer on the positive electrode sheet is A, wherein d*h1 / A is 0.0003mm*mm / (g / m 2 )-0.007mm*mm / (g / m 2 ). For example, the unit of d*h1 / A is mm*mm / (g / m 2 ), the value of d*h1 / A can be equal to 0.0003, 0.0004, 0.0005, 0.0006, 0.0007, 0.0008, 0.0009, 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, etc.

[0048] In this exemplary embodiment, d*h1 / A is too small, the surface density of the positive electrode active material layer on the positive electrode sheet is large, the heat generation of the battery is large, the thickness of the insulating coating is thin, the minimum distance between adjacent cylindrical batteries is small, the heat transfer speed of adjacent cylindrical batteries through the circumferential surface is fast, and the battery device is prone to thermal runaway diffusion; d*h1 / A is too large, the thickness of the insulating coating is thick, the heat dissipation speed of the cylindrical battery is slow, the minimum distance between adjacent cylindrical batteries is large, the internal space utilization rate of the battery device is low, the surface density of the positive electrode active material layer on the positive electrode sheet is too small, and the energy density of a single cylindrical battery is too low. This exemplary embodiment sets d*h1 / A to an appropriate size, which can reduce the risk of thermal runaway diffusion of the battery device, and can also reduce the risk of short circuit of adjacent cylindrical batteries, increase the energy density of a single cylindrical battery, and increase the heat dissipation speed of a single cylindrical battery.

[0049] It should be noted that the positive electrode active material layer can be arranged on one side or both sides of the positive electrode collector. The surface density of the positive electrode active material layer on the positive electrode sheet is: the total mass of the positive electrode active material layer on the positive electrode sheet per unit area after the single positive electrode sheet is flattened. When the positive electrode active material layer is arranged on one side of the positive electrode collector, the total mass of the positive electrode active material layer on the positive electrode sheet per unit area is the total mass of the positive electrode active material layer on the single side of the positive electrode sheet; when the positive electrode active material layer is arranged on both sides of the positive electrode collector, the total mass of the positive electrode active material layer on the positive electrode sheet per unit area is the total mass of the positive electrode active material layer on both sides of the positive electrode sheet. The surface density test method may include: cutting the electrode sheet into a disc with a radius of 2 cm on a cutting machine, and weighing the mass of the disc on an analytical balance. The surface density of the positive electrode active material layer is equal to (G1-G2) / M, G1 is the mass of the disc, G2 is the mass of the positive electrode collector in the disc, and M is the area of ​​the disc.

[0050] In the present exemplary embodiment, the thickness of the insulating coating 2 is 0.08 mm-0.16 mm. For example, the thickness of the insulating coating 2 can be 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.12 mm, 0.14 mm, 0.15 mm, 0.16 mm, etc.

[0051] In this exemplary embodiment, the battery housing 11 may include aluminum, for example, the battery housing 11 may be an aluminum shell or an aluminum alloy shell. Aluminum is relatively soft, and when the battery housing expands, the gap between adjacent batteries becomes smaller, and the thickness of the insulating coating needs to be set larger. Accordingly, d*h1 is 0.1 mm. 2 -0.64mm 2 , for example, d*h1 can be equal to 0.1mm 2 , 0.12mm 2 , 0.14mm 2 , 0.16mm 2, 0.18mm 2 , 0.20mm 2 , 0.22mm 2 , 0.24mm 2 , 0.26mm 2 , 0.28mm 2 , 0.30mm 2 , 0.32mm 2 , 0.34mm 2 , 0.36mm 2 , 0.38mm 2 , 0.40mm 2 , 0.42mm 2 , 0.44mm 2 , 0.46mm 2 , 0.48mm 2 , 0.5mm 2 , 0.52mm 2 , 0.54mm 2 、0.56mm 2 、0.58mm 2 , 0.6mm 2 、0.62mm 2 , 0.64mm 2 wait.

[0052] 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.

[0053] 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.

[0054] The exemplary embodiment further provides a battery device, which is a battery module or a battery pack.

[0055] 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.

[0056] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0057] 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.

[0058] It should be noted that 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.

[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 battery device, characterized in that: The battery device comprises: A plurality of cylindrical batteries (1), wherein the cylindrical batteries (1) include a battery housing (11) and an insulating coating (2) formed on the outer surface of the battery housing (11); The minimum distance between adjacent cylindrical batteries (1) is h1, the thickness of the insulating coating (2) is d, and d*h1 is 0.04 mm. 2 -0.64mm 2 .

2. The battery device according to claim 1, characterized in that: The battery housing (11) comprises two end walls (111) arranged opposite to each other and a peripheral wall (112) connected between the two end walls (111); the peripheral wall (112) and at least one of the end walls (111) are welded; the insulating coating (2) is not provided at the welding position between the peripheral wall (112) and the end wall (111); wherein d*h1 is 0.08 mm 2 -0.64mm 2 .

3. The battery device according to claim 2, characterized in that: The minimum distance between two adjacent cylindrical batteries (1) at the welding position of the peripheral wall (112) and the end wall (111) is h2, and h2 / h1 is greater than 1 and less than or equal to 3.

4. The battery device according to claim 1, characterized in that: The battery housing (11) comprises: an integrally formed main housing (3), the main housing (3) comprising a bottom wall (31), a peripheral wall (112), and an arc-shaped chamfered portion (32) connected between the bottom wall (31) and the peripheral wall (112), an opening being formed on the main housing (3), the bottom wall (31) and the opening being arranged opposite to each other, the opening being formed at one end of the peripheral wall (112) away from the bottom wall (31), and the bottom wall (31) forming an end wall of the battery housing; The thickness of the insulating coating (2) located on the arc-shaped chamfered portion (32) is less than the thickness of the insulating coating (2) located on the peripheral wall (112), and d*h1 is greater than or equal to 0.06 mm. 2 And less than or equal to 0.64mm 2 .

5. The battery device according to claim 1, characterized in that: The battery device further comprises: A bottom plate (41) for supporting the cylindrical battery (1); The plurality of cylindrical batteries (1) form a plurality of battery layers (5), the battery layer (5) comprising a plurality of cylindrical batteries (1) distributed in a direction parallel to the bottom plate (41), and the plurality of battery layers (5) are distributed in a direction perpendicular to the bottom plate (41); The cylindrical battery (1) is axially parallel to the bottom plate (41), and at least a portion of the structure of the cylindrical battery (1) in the battery layer (5) is embedded in a gap between two adjacent cylindrical batteries (1) in adjacent battery layers (5); d*h1 is 0.1mm 2 -0.48mm 2 .

6. The battery device according to claim 1 or 5, characterized in that: The gap between adjacent cylindrical batteries is 1mm-3mm.

7. The battery device according to claim 1, characterized in that: The battery housing (11) comprises two end walls (111) arranged opposite to each other, wherein the two end walls (111) include a first end wall (1111), and the battery device further comprises: A busbar (7), the busbar (7) being used for electrically connecting the first end wall (1111), the overlapping area between the orthographic projection of the busbar (7) on the first end wall (1111) and the first end wall (1111) being S, wherein S / d is 43.8 mm-87.5 mm.

8. The battery device according to claim 1, characterized in that: The battery comprises a positive electrode sheet, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer located on the side of the positive electrode current collector, the surface density of the positive electrode active material layer on the positive electrode sheet is A, wherein d*h1 / A is 0.0003mm*mm / (g / m 2 )-0.007mm*mm / (g / m 2 ).

9. The battery device according to claim 1, characterized in that: The thickness of the insulating coating (2) is 0.08 mm-0.16 mm.

10. The battery device according to claim 1, characterized in that: The battery housing (11) comprises aluminum; d*h1 is 0.1mm 2 -0.64mm 2 .

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