Battery apparatus and electric device

Abstract

A battery apparatus (1) and an electric device, which solve the problem that electric arcing easily occurs between an upper case and live parts of battery cells (12). The battery apparatus (1) comprises: a battery cell assembly (18) comprising a plurality of battery cells (12) having electrode terminals; a case (11), comprising a first part (112) and a second part (111), wherein the second part (111) covers the first part (112) to form an accommodating cavity for accommodating the battery cell assembly (18), a first surface (1111) of the second part (111) is provided with at least one of protrusion portions (1112) and opening portions (1113), and the first surface (1111) is the surface of the second part (111) facing the electrode terminals; and an insulating member (16) located between the first surface (1111) of the second part (111) and the battery cell assembly (18). The insulating member (16) comprises a first insulating member (161) and second insulating members (162); the first insulating member (161) is arranged opposite to the first surface (1111) of the second part (111) and is provided with hollow portions (1611) exposing at least one of the protrusion portions (1112) and the opening portions (1113); and the second insulating members (162) are arranged opposite to at least one of the protrusion portions (1112) and the parts of the first surface (1111) exposed through the hollow portions (1611) and are provided with first through holes (1623) in communication with the opening portions (1113).

Description

Battery devices and electrical equipment

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 2025200818733, filed on January 14, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery device and an electrical appliance. Background Technology

[0004] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices can be power batteries or energy storage batteries.

[0005] The battery assembly includes an upper casing, a lower casing, and individual battery cells; the upper casing covers the lower casing to house the individual battery cells. Electrical sparking may occur between the charged parts of the upper casing and the individual battery cells, causing thermal runaway of the individual battery cells, which could lead to safety accidents such as explosions of the battery assembly. Summary of the Invention

[0006] The main technical problem addressed by this application is to provide a battery device and electrical equipment that solves the problem of electrical sparking easily occurring between the upper casing and the charged parts of the battery cells.

[0007] To solve the above-mentioned technical problems, the first technical solution adopted in this application is: to provide a battery device, the battery device including a battery cell assembly, a housing, and an insulating member; the battery cell assembly includes a plurality of battery cells, each battery cell having an electrode terminal; the housing includes a first part and a second part; the second part covers the first part to form a receiving cavity for accommodating the battery cell assembly; the first surface of the second part has at least one of a protrusion and an opening; the first surface is the surface of the second part facing the electrode terminal; the insulating member is located between the first surface of the second part and the battery cell assembly; wherein the insulating member includes a first insulating member and a second insulating member; the first insulating member is disposed opposite to the first surface of the second part, and the first insulating member has a hollow portion, the hollow portion exposing at least one of the protrusion and the opening; the second insulating member is disposed opposite to at least one of the protrusion and the portion of the first surface exposed through the hollow portion, and has a first through hole communicating with the opening.

[0008] In this embodiment, the first insulating member is disposed opposite to the portion of the first surface excluding the protrusions and / or openings, and the second insulating member is disposed opposite to the protrusions and / or openings on the first surface. This improves the insulation protection capability of the second part, reduces the probability of electrical arcing between the charged body of the battery cell assembly and the second part, reduces the probability of thermal runaway of the battery device, and thus improves the reliability of the battery device.

[0009] In some embodiments, there is an overlapping area between the edge of the first insulating member and the edge of the second insulating member; the edge of the second insulating member is located between the edge of the first insulating member and the first surface.

[0010] In this embodiment, there is an overlapping area between the edges of the first insulating member and the second insulating member, and the edge of the second insulating member is located between the edge of the first insulating member and the first surface. This can enhance the firmness of the connection between the first insulating member and the second insulating member, thereby reducing the probability of the second insulating member detaching from the protrusion and / or opening. At the same time, it also solves the problem of gaps between the first insulating member and the second insulating member, thereby further improving the insulation protection capability of the second part, further reducing the probability of electrical arcing between the charged body of the battery cell assembly and the second part, and further reducing the probability of thermal runaway of the battery device.

[0011] In some embodiments, the width of the overlapping region is greater than or equal to 2 mm.

[0012] In some embodiments, the second insulating member includes a first cover portion covering the side of the protrusion facing the battery cell assembly, a second cover portion located on the first surface exposed by a cutout portion and spaced apart from the protrusion portion, and a connecting portion connecting the first cover portion and the second cover portion, the connecting portion being suspended.

[0013] In some embodiments, the second insulating member includes a first cover covering the side of the protrusion facing the battery cell assembly, a second cover located on the portion of the first surface exposed by a cutout and in contact with the protrusion, and a third cover located on the side of the protrusion.

[0014] In this embodiment, the second insulating member includes a first covering portion, a connecting portion, and a second covering portion, which can reduce the installation difficulty of the second insulating member. The second insulating member also includes a first covering portion, a third covering portion, and a second covering portion, which can increase the protective capability of the second insulating member.

[0015] In some embodiments, the protrusion includes a plurality of reinforcing ribs that extend from one side of the first surface of the second portion to the opposite side and divide the first surface into a plurality of sub-surfaces; the first insulating member includes a plurality of first insulators, one first insulator covering one sub-surface, and a cutout for exposing the reinforcing ribs is formed between two adjacent first insulators; the number of second insulating members is plurality of, and one second insulating member covers one reinforcing rib.

[0016] In this embodiment, the reinforcing ribs can increase the strength of the second part, and the second insulating member covering the reinforcing ribs can reduce the probability of electrical arcing between the reinforcing ribs and the live parts, thereby improving the reliability of the battery device.

[0017] In some embodiments, the battery device further includes a mount and a connector; the mount is disposed within a first portion; the opening is a mounting hole penetrating a second portion; a first through hole exposes the mounting hole; the second portion covers the first portion, and the connector passes through the mounting hole and the first through hole from outside the second portion and is connected to the mount.

[0018] In this embodiment, the mounting and connecting parts can be used to strengthen the connection between the first and second parts. The second insulating part covers the mounting hole, which can reduce the probability of electrical arcing between the mounting hole and the live part, thereby improving the reliability of the battery device.

[0019] In some embodiments, the first insulating member is an integrally formed structure; the cutout portion for exposing the mounting hole is a second through hole; there is an overlapping area between the edge of the second through hole of the first insulating member and the outer edge of the second insulating member; the outer edge of the second insulating member is located between the edge of the second through hole of the first insulating member and the first surface.

[0020] In this embodiment, the first insulating member is an integrally formed structure, which makes it easy to place the first insulating member on the first surface.

[0021] In some embodiments, the first insulating member includes two sub-insulating members; the two sub-insulating members are spaced apart to form a cutout for exposing the mounting hole.

[0022] In this embodiment, the two sub-insulators can reduce the difficulty of installation with the second insulator and make installation more flexible.

[0023] In some embodiments, the battery device further includes a bushing disposed between the mount and the first surface; the bushing has a third through hole for the connector to pass through; the edge of the first through hole of the second insulator is at least located on the side of the outer edge of the bushing away from the first surface.

[0024] In this embodiment, the provided gasket can reduce the probability of loosening between the connector and the mounting component. The edge of the first through hole of the second insulator is located at least on the side of the outer edge of the bushing away from the first surface, which can reduce the portion of the first through hole of the second insulator exposed outside the bushing, thereby reducing the probability of electrical arcing between the bushing and the live parts, and thus improving the reliability of the battery device.

[0025] In some embodiments, the flexibility coefficient of the first insulating element is smaller than that of the second insulating element.

[0026] In this embodiment, the flexibility coefficient of the first insulating member is smaller than that of the second insulating member, making it easier to install the second insulating member at the protrusion and the opening.

[0027] In some embodiments, the first insulating element includes a mica sheet or a polypropylene insulating film; the second insulating element includes a sprayed insulating layer or mica paper.

[0028] In this embodiment, the first insulating component includes a mica sheet or a polypropylene insulating film; the second insulating component includes a sprayed insulating layer or mica paper, which can reduce the cost of the first and second insulating components.

[0029] In some embodiments, a first insulating member covers the first surface of the second portion; a second insulating member covers the protrusion.

[0030] In some embodiments, a first insulating member covers the first surface of the second portion; a second insulating member covers the portion of the first surface exposed through the cutout.

[0031] In this embodiment, the covering method allows the insulating element and the second part to form a whole, so as to facilitate assembly with the first part.

[0032] To address the aforementioned technical problems, the second technical solution provided in this application is: to provide an electrical device comprising the aforementioned battery device and an electrical component, wherein the electrical component is electrically connected to the battery device. Since the electrical device includes the aforementioned battery device, it has the same effects as the aforementioned battery device. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 is a structural schematic diagram of the electrical equipment provided in this application;

[0035] Figure 2 is a schematic diagram of the battery device provided in this application;

[0036] Figure 3 is a bottom view of one of the second parts provided in this application;

[0037] Figure 4 is a bottom view of the second part of Figure 3 with the insulating component installed;

[0038] Figure 5 is a bottom view of another second part provided in this application;

[0039] Figure 6 is a bottom view of the second part of Figure 5 with the insulating component installed;

[0040] Figure 7 is a bottom view of another second part provided in this application;

[0041] Figure 8 is a bottom view of the second part of Figure 7 with the insulating component installed;

[0042] Figure 9 is a cross-sectional view at line BB in Figure 8;

[0043] Figure 10 is a schematic diagram of the structure of the battery cell provided in this application;

[0044] Figure 11 is a top view of the battery device provided in this application;

[0045] Figure 12 is a structural schematic diagram of the first part provided in this application;

[0046] Figure 13 is a cross-sectional view at line AA in Figure 11;

[0047] Figure 14 is a structural schematic diagram of a first insulating element provided in this application;

[0048] Figure 15 is a schematic diagram of another first insulating element provided in this application.

[0049] In the diagram: 1. Battery assembly; 11. Housing; 111. Second part; 1111. First surface; 11111. Sub-surface; 1112. Protrusion; 11121. Reinforcing rib; 1113. Opening; 11131. Mounting hole; 112. First part; 12. Battery cell; 121. Connecting member; 122. Cover plate; 123. Terminal post; 124. Safety valve; 125. Electrode assembly; 126. Housing; 13. Connector; 14. Separator beam; 15. Mounting component; 16. Insulation 1. Insulating component; 161. First insulating component; 1611. Hollowed-out portion; 16111. Second hollowed-out portion; 16112. First hollowed-out portion; 1623. First through hole; 1613. Sub-insulating component; 1614. First insulator component; 162. Second insulating component; 1621. Second insulating portion; 1622. First insulating portion; 1624. First covering portion; 1625. Connecting portion; 1627. Second covering portion; 17. Bushing; 171. Third through hole; 18. Battery cell assembly; 2. Electrical components. Embodiments of the present invention

[0050] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0051] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices can be power batteries, which provide power to tools and vehicles, such as electric cars, electric trains, electric bicycles, golf carts, and aerospace equipment. Of course, battery devices can also be energy storage batteries, which are used to store energy from renewable energy sources such as hydroelectric, thermal, wind, and solar power plants. As the application areas of battery devices continue to expand, the market demand is also constantly increasing.

[0056] The battery assembly may include an upper housing, a lower housing, and individual battery cells; the upper housing covers the lower housing to accommodate the individual battery cells.

[0057] Reinforcing ribs are provided on the inner surface of the upper housing, and insulating structures (such as mica sheets) are provided on the inner surface of the upper housing between two adjacent reinforcing ribs. Because there are no insulating structures on the reinforcing ribs, the insulation of the reinforcing ribs of the upper housing is poor; electrical sparks can easily occur between the reinforcing ribs and the charged parts of the battery cells (such as terminals), which can cause thermal runaway of the battery cells, and in turn, lead to safety accidents such as explosions of the battery device.

[0058] The upper housing has a through hole on its inner surface, and a mounting component is installed inside the lower housing. After the upper and lower housings are closed, a connector passes through the through hole from the upper housing and connects to the mounting component. Because the insulation structure exposes the portion of the upper housing's inner surface located at the through hole, the upper housing has poor insulation. The exposed portion of the upper housing's inner surface can easily generate electrical sparks with the charged parts of the battery cells (such as terminals), causing thermal runaway of the battery cells and potentially leading to safety accidents such as battery explosion.

[0059] To address the issue of electrical sparking easily occurring between the charged components of the upper casing and the individual battery cells, embodiments of this application provide a battery device. The battery device includes a battery cell assembly, a casing, and an insulating member. The battery cell assembly includes multiple battery cells, each having electrode terminals. The casing includes a first portion and a second portion. The second portion covers the first portion to form a receiving cavity for accommodating the battery cell assembly. The first surface of the second portion has a protrusion and / or an opening. The first surface is the surface of the second portion facing the electrode terminals. The insulating member is located between the first surface of the second portion and the battery cell assembly. The insulating member includes a first insulating member and a second insulating member. The first insulating member is disposed opposite to the first surface of the second portion and has a cutout portion exposing the protrusion and / or the opening. The second insulating member is disposed opposite to the protrusion, and / or opposite to the portion of the first surface exposed through the cutout portion, and has a first through-hole communicating with the opening. The first insulating member is disposed opposite to the portion of the first surface excluding the protrusions and / or openings, and the second insulating member is disposed opposite to the protrusions and / or openings on the first surface, thereby improving the insulation protection capability of the second part, reducing the probability of electrical arcing between the charged parts of the battery cell assembly and the second part, reducing the probability of thermal runaway of the battery device, and thus improving the reliability of the battery device.

[0060] An embodiment of this application provides an electrical device. Referring to FIG1, the electrical device may include a device body and a battery device, the battery device being disposed in the device body. The battery device is used to supply power to the electrical components of the device body, enabling the device body to operate.

[0061] Electrical devices can be components that can use electricity; for example, electrical devices can be controllers and electronic components, and the controller can be a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0062] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. For ease of explanation, the following examples use vehicles as an example of electrical equipment.

[0063] In some examples, the electrical equipment can be a vehicle, the main body of which can be a frame, with the battery mounted on the frame. Electrical components can be vehicle lights (e.g., headlights, taillights), displays, dashboards, control systems (e.g., controllers), etc. These electrical components are mounted on the vehicle body.

[0064] An embodiment of this application provides a battery device. Referring to Figures 2-9, the battery device 1 includes a battery cell assembly 18, a housing 11, and an insulating member 16. The battery cell assembly 18 includes a plurality of battery cells 12, each battery cell 12 having an electrode terminal. The housing 11 includes a first portion 112 and a second portion 111. The second portion 111 covers the first portion 112 to form a receiving cavity for accommodating the battery cell assembly 18. The first surface 1111 of the second portion 111 has a protrusion 1112 and / or an opening 1113. The first surface 1111 is the surface of the second portion 111 facing the electrode terminal. The insulating member 16 is located at the first... Between the first surface 1111 of the second part 111 and the battery cell assembly 18; wherein, the insulating member 16 includes a first insulating member 161 and a second insulating member 162; the first insulating member 161 is disposed opposite to the first surface 1111 of the second part 111, and the first insulating member 161 has a hollow portion 1611, the hollow portion 1611 exposing a protrusion 1112 and / or an opening 1113; the second insulating member 162 is disposed opposite to the protrusion 1112, and / or the second insulating member 162 is disposed opposite to the portion of the first surface 1111 exposed by the hollow portion 1611, and has a first through hole 1623 communicating with the opening 1113.

[0065] In some examples, a first insulating member 161 covers the first surface 1111 of the second portion 111; a second insulating member 162 covers the protrusion 1112, and / or the second insulating member 162 covers the portion of the first surface 1111 exposed through the cutout 1611.

[0066] In other examples, a first insulating member 161 covers a first sub-surface of the battery cell assembly 18 near the first surface 1111, and the first sub-surface is disposed opposite to the first surface 1111. A second insulating member 162 covers a second sub-surface of the battery cell assembly 18 near the first surface 1111, and the second sub-surface is disposed opposite to the protrusion 1112, and / or the second insulating member 162 covers a third sub-surface of the battery cell assembly 18 near the first surface 1111 exposed by the cutout 1611.

[0067] In the following description, the example is that the first insulating member 161 covers the first surface 1111 of the second part 111; the second insulating member 162 covers the protrusion 1112; and / or the second insulating member 162 covers the portion of the first surface 1111 exposed through the cutout 1611.

[0068] The first insulating member 161 covers the first surface 1111 of the second part 111, which can be understood as the first insulating member 161 covering the part of the first surface 1111 excluding the protrusion 1112 and / or the opening 1113.

[0069] The cutout portion 1611 may include a first cutout portion 16112 and / or a second cutout portion 16111, wherein the first cutout portion 16112 exposes a protrusion 1112 and the second cutout portion 16111 exposes an opening 1113.

[0070] The second insulating member 162 may include a first insulating portion 1622 and / or a second insulating portion 1621. The first insulating portion 1622 is disposed opposite to the protrusion 1112. The second insulating portion 1621 is disposed opposite to the portion of the first surface 1111 exposed by the cutout portion 1611 (i.e., the second cutout portion 16111) and has a first through hole 1623 communicating with the opening 1113. In some examples, the first insulating portion 1622 covers the protrusion 1112; the second insulating portion 1621 covers the portion of the first surface 1111 exposed by the cutout portion 1611 (i.e., the second cutout portion 16111) and has a first through hole 1623 communicating with the opening 1113.

[0071] The first insulating portion 1622 is adapted to the protrusion 1112, for example, the protrusion 1112 is a reinforcing rib 11121, and the first insulating portion 1622 is an elongated structure. The second insulating portion 1621 is adapted to the opening 1113, for example, the opening 1113 is a through hole, and the second insulating portion 1621 is an annular structure.

[0072] In some examples, referring to Figures 3 and 4, the first surface 1111 of the second portion 111 has only an opening 1113. In this case, the cutout portion 1611 (i.e., the second cutout portion 16111) exposes the opening 1113. The second insulating member 162 (i.e., the second insulating portion 1621) covers the portion of the first surface 1111 exposed through the cutout portion 1611 (i.e., the second cutout portion 16111) and has a first through hole 1623 communicating with the opening 1113. Here, the opening 1113 can be understood as a structure with an opening on the first surface 1111. This opening can extend through the second portion 111, in which case the opening 1113 can be called a through hole; the opening can also extend without penetrating the second portion 111, in which case the opening 1113 can be called a recessed groove. The opening 1113 may include at least one of a through hole, a recessed groove, etc. For example, the opening 1113 may be a mounting hole 11131, and the second cutout 16111 may be a second through hole. The second cutout 16111 (i.e., the second through hole) exposes the first through hole 1623 and the mounting hole 11131, and the first through hole 1623 exposes the mounting hole 11131.

[0073] In other examples, referring to Figures 5 and 6, the first surface 1111 of the second portion 111 has only a protrusion 1112. In this case, the cutout portion 1611 (i.e., the first cutout portion 16112) exposes the protrusion 1112, and the second insulating member 162 (i.e., the first insulating portion 1622) covers the protrusion 1112. The protrusion 1112 can be understood as a structure protruding from the first surface 1111. The protrusion 1112 may include at least one of the following: a reinforcing rib 11121, a protrusion, etc. For example, the protrusion 1112 is a reinforcing rib 11121.

[0074] In other examples, referring to Figures 7-9, the first surface 1111 of the second portion 111 has a protrusion 1112 and an opening 1113, in which case the cutout portion 1611 exposes the protrusion 1112 and the opening 1113 (i.e., the second cutout portion 16111 exposes the opening 1113, and the first cutout portion 16112 exposes the protrusion 1112); the second insulating member 162 (i.e., the first insulating portion 1622) covers the protrusion 1112; the second insulating member 162 (i.e., the second insulating portion 1621) also covers the portion of the first surface 1111 exposed through the cutout portion 1611, and has a first through hole 1623 communicating with the opening 1113. For example, the protrusion 1112 and the opening 1113 are staggered.

[0075] In some examples, the first insulating member 161 may be a one-piece molded structure, and the first insulating member 161 has a second hollow portion 16111 and a first hollow portion 16112. In other examples, the first insulating member 161 includes a plurality of first insulators, and a first hollow portion 16112 may be formed between two adjacent first insulators 1614, and the first insulator 1614 has a second hollow portion 16111.

[0076] The first insulating member 161 can be a flat structure such as a plate or sheet. The second insulating member 162 can be a flat structure such as a sheet or paper. For example, the first insulating member 161 can be plate-shaped, and the second insulating member 162 can be paper-shaped. The material of the first insulating member 161 is an insulating material, and the material of the second insulating member 162 is an insulating material. This insulating material can be an organic insulating material, such as plastic or rubber; or an inorganic insulating material, such as ceramic, glass, or mica. In some examples, the flexibility coefficient of the first insulating member 161 is the same as that of the second insulating member 162. In other examples, the flexibility coefficient of the first insulating member 161 is smaller than that of the second insulating member 162. The flexibility coefficient describes the deformation capacity of a structure under external force, and is usually expressed as the displacement or deformation of the structure under a unit external force. The first insulating member 161 and the second insulating member 162 can be partially overlapped, or they can be joined together.

[0077] The first surface 1111 is the surface of the second part 111 facing the electrode terminal, which can be understood as the first surface 1111 being the inner surface of the second part 111.

[0078] The housing 11 has a receiving cavity; the second part 111 covers the first part 112, forming the receiving cavity. One or more battery cell assemblies 18 are housed within the receiving cavity. The housing 11 serves to protect the battery cell assemblies 18 and also facilitates the assembly of multiple battery cell assemblies 18 together. In some examples, the housing 11 may include a lower housing and an upper housing; for example, the first part 112 may be the lower housing and the second part 111 may be the upper housing; or, for another example, the first part 112 may be the upper housing and the second part 111 may be the lower housing.

[0079] In some examples, the first insulator 161 is disposed opposite to the charged part of the battery cell assembly 18, and the second insulator 162 is disposed offset from the charged part of the battery cell assembly 18.

[0080] The electrode terminals of the battery cell 12 can be terminals 123, tabs, etc. In some examples, the battery cell assembly 18 may consist of only multiple battery cells. In this case, the charged component of the battery cell assembly 18 can be the electrode terminals of the battery cells 12. In other examples, the battery cell assembly 18 may include multiple battery cells; it may also include a top plate, a bottom plate, two end plates, and two side plates. Multiple battery cells 12 are disposed in the space enclosed by the top plate, bottom plate, two end plates, and two side plates; in this case, the top plate, bottom plate, two end plates, two side plates, and multiple battery cells 12 can constitute a battery module; the charged component of the battery cell assembly 18 can be a battery module tab, etc., which is electrically connected to the electrode terminals of the battery cells 12.

[0081] The battery cell 12 can be a rechargeable battery, which refers to a battery cell 12 that can be recharged after being discharged to activate the active materials and continue to be used. The battery cell 12 can include, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0082] Referring to Figure 10, the battery cell 12 may include a housing 126, an electrode assembly 125, and a cover 122. The housing 126 has a communicating cavity and a mounting port. The number of electrode assemblies 125 may be one or more; the electrode assemblies 125 are mounted within the cavity of the housing 126. The cover 122 is connected to the housing 126 and covers the mounting port. The housing 126 is filled with an electrolyte, such as an electrolyte solution.

[0083] The electrode assembly 125 may include an anode electrode and a cathode electrode, as well as a separator disposed between the anode electrode and the cathode electrode. During the charging and discharging process of the battery cell 12, active ions (such as lithium ions) move back and forth between the anode electrode and the cathode electrode, inserting and extracting. The separator can, to some extent, prevent short circuits between the anode electrode and the cathode electrode, while allowing active ions to pass through.

[0084] The battery cell 12 may also include a safety valve 124 (also called a pressure relief valve), two terminals 123, and two connecting members 121 (also called current collectors). The safety valve 124 may be mounted on the cover plate 122, for example, the safety valve 124 may be fixed to the cover plate 122. The safety valve 124 is actuated when the internal pressure or temperature of the battery cell 12 reaches a threshold to release the internal electrolyte, thereby reducing the internal pressure or temperature of the battery cell 12. For example, the safety valve 124 may be a temperature-sensitive valve, a pressure-sensitive valve, etc. The two terminals 123 may be mounted on the cover plate 122, and the two terminals 123 are respectively the positive terminal 123 and the negative terminal 123. Each terminal 123 is correspondingly connected to a connecting member 121. The connecting member 121 is located between the cover plate 122 and the electrode assembly 125, and is used to electrically connect the electrode assembly 125 and the terminal 123. The shell 126 is a hollow structure, and the material of the shell 126 can be metal or plastic; for example, the material of the shell 126 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0085] In this embodiment, the first insulating member 161 is disposed opposite to the portion of the first surface 1111 excluding the protrusions 1112 and / or the openings 1113, and the second insulating member 162 is disposed opposite to the protrusions 1112 and / or the openings 1113 on the first surface 1111. This improves the insulation protection capability of the second part 111, reduces the probability of electrical arcing between the charged body of the battery cell assembly 18 and the second part 111, reduces the probability of thermal runaway of the battery device 1, and thus improves the reliability of the battery device 1.

[0086] In some embodiments, referring to FIG9, there is an overlapping region D between the edge of the first insulating member 161 and the edge of the second insulating member 162; the edge of the second insulating member 162 is located between the edge of the first insulating member 161 and the first surface 1111.

[0087] In this embodiment, there is an overlapping area D between the edge of the first insulating member 161 and the edge of the second insulating member 162. The edge of the second insulating member 162 is located between the edge of the first insulating member 161 and the first surface 1111. This can enhance the firmness of the connection between the first insulating member 161 and the second insulating member 162, thereby reducing the probability of the second insulating member 162 detaching from the protrusion 1112 and / or the opening 1113. At the same time, it also solves the problem of the gap between the first insulating member 161 and the second insulating member 162, thereby further improving the insulation protection capability of the second part 111, further reducing the probability of electrical arcing between the charged body of the battery cell assembly 18 and the second part 111, and further reducing the probability of thermal runaway of the battery device 1.

[0088] In some embodiments, continuing to refer to FIG9, the width of the overlapping region D is greater than or equal to 2 mm.

[0089] For example, the width of the overlapping area D is 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 8mm, 10mm, etc.

[0090] In some embodiments, continuing to refer to FIG9, the second insulating member 162 includes a first cover portion 1624 covering the top of the protrusion 1112 facing the battery cell assembly 18, a second cover portion 1627 located on the portion of the first surface 1111 exposed by the cutout portion 1611 and spaced apart from the protrusion 1112, and a connecting portion 1625 connecting the first cover portion 1624 and the second cover portion 1627, the connecting portion 1625 being suspended; or, the second insulating member 162 includes a first cover portion 1624 covering the protrusion 1112 facing the battery cell assembly 18, a second cover portion 1627 located on the portion of the first surface 1111 exposed by the cutout portion 1611 and in contact with the protrusion 1112, and a third cover portion located on the side of the protrusion 1112.

[0091] In some examples, the first cover 1624, the connecting part 1625, and the second cover 1627 are integrally formed structures. In some examples, the first cover 1624, the third cover, and the second cover 1627 are integrally formed structures.

[0092] In this embodiment, the second insulating member 162 includes a first covering portion 1624, a connecting portion 1625, and a second covering portion 1627, which can reduce the installation difficulty of the second insulating member 162. The second insulating member 162 also includes a first covering portion 1624, a third covering portion, and a second covering portion 1627, which can increase the protective capability of the second insulating member 162.

[0093] In some embodiments, referring to Figures 5-9, the protrusion 1112 includes a plurality of reinforcing ribs 11121, which extend from one side of the first surface 1111 of the second portion 111 to the opposite side and divide the first surface 1111 into a plurality of sub-surfaces 11111; the first insulating member 161 includes a plurality of first insulating elements 1614, one first insulating element 1614 covering one sub-surface 11111, and a cutout 1611 for exposing the reinforcing ribs 11121 is formed between two adjacent first insulating elements 1614; the number of second insulating members 162 is plurality of, and one second insulating member 162 covers one reinforcing rib 11121.

[0094] In this embodiment, the hollow portion 1611 used to expose the reinforcing rib 11121 is the first hollow portion 16112 described above.

[0095] The number of multiple sub-surfaces 11111 is the same as the number of multiple first insulators 1614. When the first surface 1111 has multiple reinforcing ribs 11121 but no openings 1113, the number of multiple second insulators 162 (i.e., first insulating portions 1622) is the same as the number of multiple reinforcing ribs 11121. When the first surface 1111 has openings 1113 and multiple reinforcing ribs 11121, the number of multiple second insulators 162 (i.e., first insulating portions 1622 and second insulating portions 1621) is equal to the sum of the number of multiple reinforcing ribs 11121 and the number of openings 1113.

[0096] Multiple reinforcing ribs 11121 can be arranged in parallel or in a crisscross pattern.

[0097] The reinforcing rib 11121 is located between two adjacent sub-surfaces 11111. The sub-surface 11111 has an opening 1113.

[0098] In some examples, the first insulator 1614 is a one-piece structure, having a cutout portion 1611 (i.e., a second cutout portion 16111) for exposing the opening 1113. In this case, the second cutout portion 16111 can be a hole, such as a second through hole. In other examples, the first insulator 1614 includes two sub-insulators spaced apart, forming a cutout portion 1611 (i.e., a second cutout portion 16111) for exposing the opening 1113.

[0099] In this embodiment, the reinforcing rib 11121 can increase the strength of the second part 111. The second insulating member 162 covers the reinforcing rib 11121, which can reduce the probability of electrical arcing between the reinforcing rib 11121 and the live part, thereby improving the reliability of the battery device 1.

[0100] In some embodiments, referring to Figures 11-13, the battery device 1 further includes a mounting member 15 and a connector 13; the mounting member 15 is disposed within the first portion 112; the opening 1113 is a mounting hole 11131 penetrating the second portion 111; a first through hole 1623 exposes the mounting hole 11131; the second portion 111 covers the first portion 112, and the connector 13 passes through the mounting hole 11131 and the first through hole 1623 from outside the second portion 111 and is then connected to the mounting member 15.

[0101] The number of mounting components 15 can be one or more, and the number of connecting components 13 is the same as the number of mounting components 15. The mounting components 15 and connecting components 13 can be connected by bolts or by snap-fit ​​connections, etc. The connecting components 13 can be bolts, etc. The mounting components 15 can be mounting sleeves, etc.

[0102] In some examples, the first part 112 is provided with multiple partition beams 14, which can divide the receiving cavity into multiple sub-cavities, in which multiple battery cells 12 or multiple battery modules are disposed. The multiple partition beams 14 can be arranged parallel to each other or crisscrossed. The mounting member 15 can be disposed on the partition beams 14.

[0103] In this embodiment, the hanger 15 and connector 13 can strengthen the connection between the first part 112 and the second part 111. The second insulating member 162 covers the mounting hole 11131, which can reduce the probability of electrical arcing between the mounting hole 11131 and the live body, thereby improving the reliability of the battery device 1.

[0104] In some embodiments, referring to FIG14, the first insulating member 161 is an integrally formed structure; the cutout portion 1611 for exposing the mounting hole 11131 is a second through hole; there is an overlapping area D between the edge of the second through hole of the first insulating member 161 and the outer edge of the second insulating member 162; the outer edge of the second insulating member 162 is located between the edge of the second through hole of the first insulating member 161 and the first surface 1111.

[0105] In some examples, the width of the overlapping region D is greater than or equal to 2 mm. For example, the width of the overlapping region D is 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 8 mm, 10 mm, etc.

[0106] In this embodiment, the first insulating member 161 is an integrally formed structure, which makes it easy to place the first insulating member 161 on the first surface 1111.

[0107] In some embodiments, referring to FIG15, the first insulating member 161 includes two sub-insulating members 1613; the two sub-insulating members 1613 are spaced apart to form a cutout 1611 for exposing the mounting hole 11131.

[0108] In some examples, the two sub-insulators 1613 are arranged overlapping the second insulator 162. In other examples, the sub-insulators 1613 and the second insulator 162 are arranged spaced apart.

[0109] Mounting hole 11131 is located between two sub-insulators 1613.

[0110] In this embodiment, the two sub-insulators 1613 can reduce the difficulty of installation with the second insulator 162 and make installation more flexible.

[0111] In some embodiments, referring to FIG13, the battery device 1 further includes a bushing 17 disposed between the mount 15 and the first surface 1111; the bushing 17 has a third through hole 171 for the connector 13 to pass through; the edge of the first through hole 1623 of the second insulator 162 is at least located on the side of the outer edge of the bushing 17 away from the first surface 1111.

[0112] In some examples, the edge of the first through-hole 1623 of the second insulator 162 extends between the bushing 17 and the mount 15. In other examples, the edge of the first through-hole 1623 of the second insulator 162 extends to contact the outer wall of the mount 15.

[0113] In some examples, bushing 17 includes a first portion and a second portion that are connected. The first portion is located between the mount 15 and the first surface 1111; the second portion has a third through hole 171 and is located within mounting hole 11131. The second portion can contact the wall of mounting hole 11131.

[0114] In this embodiment, the provided gasket can reduce the probability of loosening between the connector 13 and the mounting member 15. The edge of the first through hole 1623 of the second insulator 162 is located at least on the side of the outer edge of the bushing 17 away from the first surface 1111, which can reduce the portion of the first through hole 1623 of the second insulator 162 exposed outside the bushing 17, thereby reducing the probability of electrical arcing between the bushing 17 and the live part, and thus improving the reliability of the battery device 1.

[0115] In addition, it can improve the sealing between the second insulating element 162 and the bushing 17.

[0116] In some embodiments, the flexibility coefficient of the first insulating member 161 is smaller than that of the second insulating member 162.

[0117] For example, the ratio of the flexibility coefficient of the first insulating element 161 to the flexibility coefficient of the second insulating element 162 is 0.9, 0.8, 0.7, 0.5, 0.4, 0.3, 0.2 or 0.1, etc.

[0118] In this embodiment, the flexibility coefficient of the first insulating member 161 is smaller than that of the second insulating member 162, making it easier for the second insulating member 162 to be disposed at the protrusion 1112 and the opening 1113.

[0119] In some embodiments, the first insulating element 161 includes a mica sheet or a polypropylene insulating film; the second insulating element 162 includes a sprayed insulating layer or mica paper.

[0120] In some examples, the first insulating element 161 is a mica board and the second insulating element 162 is mica paper.

[0121] In this embodiment, the first insulating element 161 includes a mica sheet or a polypropylene insulating film; the second insulating element 162 includes a sprayed insulating layer or mica paper, which can reduce the cost of the first insulating element 161 and the second insulating element 162.

[0122] In some embodiments, the first insulating member 161 covers the first surface 1111 of the second portion 111; the second insulating member 162 covers the protrusion 1112, and / or the second insulating member 162 covers the portion of the first surface 1111 exposed through the cutout 1611.

[0123] In this embodiment, the covering method allows the insulating element 16 and the second part 111 to form a whole, so as to facilitate assembly with the first part 112.

[0124] Several embodiments of this application are provided below.

[0125] In the first embodiment, referring to Figures 2 to 4, the battery device 1 includes a battery cell assembly 18, a housing 11, and an insulating component 16; the housing 11 includes a first part 112 and a second part 111; the second part 111 covers the first part 112 and is used to accommodate the battery cell assembly 18.

[0126] The first surface 1111 of the second part 111 has an opening 1113; the first surface 1111 is the surface of the second part 111 close to the first part 112; an insulating member 16 is disposed on the first surface 1111 of the second part 111; wherein, the insulating member 16 includes a first insulating member 161 and a second insulating member 162; the first insulating member 161 covers the first surface 1111 of the second part 111 and has a cutout 1611; the cutout 1611 exposes the opening 1113; the second insulating member 162 covers the portion of the first surface 1111 exposed through the cutout 1611, and has a first through hole 1623 communicating with the opening 1113.

[0127] The opening 1113 has multiple mounting holes 11131. The battery device 1 also includes a mount 15 and a connector 13; the mount 15 is disposed within the first portion 112; the second portion 111 covers the first portion 112, and the connector 13 passes through the mounting holes 11131 and the first through hole 1623 from outside the second portion 111 and is connected to the mount 15. The battery device 1 also includes a bushing 17, which is placed between the mount 15 and the first surface 1111; the bushing 17 has a third through hole 171 for the connector 13 to pass through; the edge of the first through hole 1623 of the second insulator 162 is at least located on the side of the outer edge of the bushing 17 away from the first surface 1111.

[0128] There is an overlapping region D between the edges of the first insulating member 161 and the second insulating member 162; the edge of the second insulating member 162 is located between the edge of the first insulating member 161 and the first surface 1111. The width of the overlapping region D is greater than or equal to 2 mm. The flexibility coefficient of the first insulating member 161 is less than that of the second insulating member 162. The first insulating member 161 includes a mica sheet or a polypropylene insulating film; the second insulating member 162 includes a sprayed insulating layer or mica paper.

[0129] Example 2, see Figures 2, 5 and 6; the battery device 1 includes a battery cell assembly 18, a housing 11 and an insulating component 16; the housing 11 includes a first part 112 and a second part 111; the second part 111 covers the first part 112 and is used to accommodate the battery cell assembly 18.

[0130] The first surface 1111 of the second part 111 has a protrusion 1112; the first surface 1111 is the surface of the second part 111 close to the first part 112; an insulating member 16 is disposed on the first surface 1111 of the second part 111; wherein, the insulating member 16 includes a first insulating member 161 and a second insulating member 162; the first insulating member 161 covers the first surface 1111 of the second part 111 and has a hollow portion 1611; the hollow portion 1611 exposes the protrusion 1112; the second insulating member 162 covers the protrusion 1112.

[0131] The protrusion 1112 comprises multiple reinforcing ribs 11121. These reinforcing ribs 11121 extend from one side of the first surface 1111 of the second portion 111 to the opposite side, dividing the first surface 1111 into multiple sub-surfaces 11111. The first insulating member 161 includes multiple spaced-apart first insulators 1614, each covering one sub-surface 11111, and adjacent first insulators 1614 form a perforation 1611 for exposing the reinforcing ribs 11121; the number of first insulators 1614 is the same as the number of sub-surfaces 11111. Multiple second insulating members 162 are present, each covering one reinforcing rib 11121.

[0132] There is an overlapping region D between the edges of the first insulating member 161 and the second insulating member 162; the edge of the second insulating member 162 is located between the edge of the first insulating member 161 and the first surface 1111. The width of the overlapping region D is greater than or equal to 2 mm. The flexibility coefficient of the first insulating member 161 is less than that of the second insulating member 162. The first insulating member 161 includes a mica sheet or a polypropylene insulating film; the second insulating member 162 includes a sprayed insulating layer or mica paper.

[0133] Example 3, referring to Figures 2, 7-9, and 11-15; the battery device 1 includes a battery cell assembly 18, a housing 11, and an insulating member 16; the housing 11 includes a first part 112 and a second part 111; the second part 111 covers the first part 112 and is used to accommodate the battery cell assembly 18; the first surface 1111 of the second part 111 has a protrusion 1112 and an opening 1113; the first surface 1111 is the surface of the second part 111 adjacent to the first part 112; the insulating member 16 is disposed on the second part. On the first surface 1111 of 111; wherein, the insulating member 16 includes a first insulating member 161 and a second insulating member 162; the first insulating member 161 covers the first surface 1111 of the second portion 111 and has a cutout portion 1611; the cutout portion 1611 exposes a protrusion 1112 and an opening portion 1113; the second insulating member 162 covers the protrusion 1112, the second insulating member 162 also covers the portion of the first surface 1111 exposed through the cutout portion 1611, and has a first through hole 1623 communicating with the opening portion 1113.

[0134] The protrusion 1112 is a plurality of reinforcing ribs 11121. The plurality of reinforcing ribs 11121 extend from one side of the first surface 1111 of the second part 111 to the opposite side and divide the first surface 1111 into a plurality of sub-surfaces 11111.

[0135] The first insulating member 161 includes a plurality of first insulator sub-members 1614, each first insulator sub-member 1614 covering a sub-surface 11111, and adjacent first insulator sub-members 1614 forming a cutout 1611 for exposing the reinforcing rib 11121; the number of the plurality of first insulator sub-members 1614 is the same as the number of the plurality of sub-surfaces 11111. The first insulating member 161 may be a one-piece molded structure, or it may include a plurality of first insulator sub-members 1614 spaced apart. The first insulator sub-member 1614 may be a one-piece molded structure, or it may include two spaced-apart sub-insulator sub-members 1613.

[0136] Sub-surface 11111 has an opening 1113, which is a plurality of mounting holes 11131. A first insulator 1614 may have a cutout 1611 that exposes the mounting holes 11131. On each sub-surface 11111, the number of mounting holes 11131 and cutouts 1611 are the same.

[0137] There are multiple second insulating members 162. Each second insulating member 162 may include a first insulating portion 1622 and a second insulating portion 1621. A first insulating portion 1622 covers a reinforcing rib 11121. A second insulating portion 1621 covers the portion of the first surface 1111 exposed through a cutout portion 1611 (i.e., the second cutout portion 16111) and has a first through hole 1623 communicating with the mounting hole 11131.

[0138] The battery device 1 also includes a mount 15 and a connector 13; the mount 15 is disposed within a first portion 112; a second portion 111 covers the first portion 112, and the connector 13 passes through a mounting hole 11131 and a first through hole 1623 from outside the second portion 111 and is then connected to the mount 15. The battery device 1 also includes a bushing 17, which is placed between the mount 15 and the first surface 1111; the bushing 17 has a third through hole 171 through which the connector 13 passes; the edge of the first through hole 1623 of the second insulator 162 is at least located on the side of the outer edge of the bushing 17 away from the first surface 1111.

[0139] There is an overlapping region D between the edges of the first insulating member 161 and the second insulating member 162; the edge of the second insulating member 162 is located between the edge of the first insulating member 161 and the first surface 1111. The width of the overlapping region D is greater than or equal to 2 mm. The flexibility coefficient of the first insulating member 161 is less than that of the second insulating member 162. The first insulating member 161 includes a mica sheet or a polypropylene insulating film; the second insulating member 162 includes a sprayed insulating layer or mica paper.

[0140] The above description is merely an embodiment of this application and does not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A battery device, wherein, include: A battery cell assembly includes multiple battery cells, each battery cell having electrode terminals; The enclosure comprises a first part and a second part; The second portion covers the first portion to form a receiving cavity for accommodating the battery cell assembly; the first surface of the second portion has at least one of a protrusion and an opening; The first surface is the surface of the second portion facing the electrode terminal; An insulating element is located between the first surface of the second portion and the battery cell assembly; The insulating component includes a first insulating component and a second insulating component; the first insulating component is disposed opposite to the first surface of the second portion, and the first insulating component has a hollow portion, the hollow portion exposing at least one of the protrusion and the opening; The second insulating member is disposed opposite to at least one of the protrusion and the portion of the first surface exposed through the cutout, and has a first through hole communicating with the opening.

2. The battery device according to claim 1, wherein, There is an overlapping area between the edge of the first insulating member and the edge of the second insulating member; the edge of the second insulating member is located between the edge of the first insulating member and the first surface.

3. The battery device according to claim 2, wherein, The width of the overlapping area is greater than or equal to 2 mm.

4. The battery device according to claim 1, wherein, The second insulating member includes a first cover portion covering the side of the protrusion facing the battery cell assembly, a second cover portion located on the first surface exposed through the cutout portion and spaced apart from the protrusion portion, and a connecting portion connecting the first cover portion and the second cover portion, the connecting portion being suspended.

5. The battery device according to claim 1, wherein, The second insulating member includes a first cover portion covering the side of the protrusion facing the battery cell assembly, a second cover portion located on the first surface exposed through the cutout portion and in contact with the protrusion portion, and a third cover portion located on the side of the protrusion portion.

6. The battery device according to claim 1, wherein, The protrusion includes a plurality of reinforcing ribs, which extend from one side of the first surface of the second portion to the opposite side and divide the first surface into a plurality of sub-surfaces; the first insulating member includes a plurality of first insulators, one first insulator covering one of the sub-surfaces, and a cutout portion for exposing the reinforcing ribs is formed between two adjacent first insulators; the number of second insulating members is plurality of, and one second insulating member covers one reinforcing rib.

7. The battery device according to claim 1, wherein, The battery device also includes mounting components and connectors; The mounting component is disposed within the first part; the opening is a mounting hole that penetrates the second part; the first through hole exposes the mounting hole; The second part covers the first part, and the connector passes through the mounting hole and the first through hole from the outside of the second part and is connected to the mount.

8. The battery device according to claim 7, wherein, The first insulating component is a one-piece molded structure; the hollow portion used to expose the mounting hole is a second through hole; There is an overlapping area between the edge of the second through hole of the first insulating member and the outer edge of the second insulating member; the outer edge of the second insulating member is located between the edge of the second through hole of the first insulating member and the first surface.

9. The battery device according to claim 7, wherein, The first insulating member includes two sub-insulating members; the two sub-insulating members are spaced apart to form the cutout portion for exposing the mounting hole.

10. The battery device according to claim 7, wherein, The battery device further includes a bushing disposed between the mount and the first surface; the bushing has a third through hole for the connector to pass through; the edge of the first through hole of the second insulator is at least located on the side of the outer edge of the bushing away from the first surface.

11. The battery device according to claim 1, wherein, The flexibility coefficient of the first insulating element is smaller than that of the second insulating element.

12. The battery device according to claim 11, wherein, The first insulating component includes a mica sheet or a polypropylene insulating film; the second insulating component includes a sprayed insulating layer or mica paper.

13. The battery device according to claim 1, wherein, The first insulating element covers the first surface of the second portion; the second insulating element covers the protrusion.

14. The battery device according to claim 1, wherein, The first insulating element covers the first surface of the second portion; the second insulating element covers the portion of the first surface exposed through the cutout.

15. An electrical appliance, wherein, It includes a device body and a battery device as described in any one of claims 1 to 12, wherein the battery device is disposed on the device body.

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