Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of battery devices. The battery device comprises a battery monomer assembly, and the battery monomer assembly comprises a box body and at least two battery monomer assemblies accommodated in the box body. Each battery monomer assembly comprises a plurality of battery monomers, a limiting assembly and an insulating layer; the plurality of single batteries are stacked, and the limiting assembly is arranged on the peripheries of the plurality of single batteries in a surrounding manner so as to fix the plurality of single batteries. The insulating layer is arranged on the outer surface of the limiting assembly. According to the technical scheme, the capacitance between two adjacent battery monomer assemblies can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery device and an electric equipment. BACKGROUND

[0002] Due to the structural characteristics of the battery device, the battery monomer assemblies in the battery device and between the battery monomer assemblies and the box of the battery device are passively formed into capacitances. However, when the capacitance is large, it will cause adverse effects on the battery device and the surrounding environment. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a battery device and an electric equipment, which aims to reduce the capacitance between two adjacent battery monomer assemblies.

[0004] To achieve the above-mentioned purpose, the battery device provided by the present application comprises a box and at least two battery monomer assemblies accommodated in the box. Each battery monomer assembly comprises a battery monomer, a limiting assembly and an insulating layer. The battery monomers are stacked in multiple, the limiting assembly is arranged around the outer periphery of the multiple battery monomers to fix the multiple battery monomers, and the insulating layer is arranged on the outer surface of the limiting assembly.

[0005] The technical scheme of the present application can increase the capacity of the battery device on the one hand, and can also make the box have a good protection effect on the battery monomer assembly on the other hand. The multiple battery monomers in each battery monomer assembly are stacked, and the limiting assembly is arranged around the outer periphery of the multiple battery monomers to fix the multiple battery monomers, so that the integrity of the multiple battery monomers in series or parallel can be realized on the one hand, and the further protection effect of the battery monomers can be realized on the other hand. By arranging the insulating layer on the outer surface of the limiting assembly, the distance between the limiting assemblies of at least two adjacent battery monomer assemblies in the battery device can be increased, that is, the distance between the two pole pieces is increased, and thus the capacitance formed between the two adjacent battery monomer assemblies can be reduced.

[0006] In an embodiment of the present application, the limiting assembly comprises a side plate and an end plate, the side plate is oppositely arranged with two in a first direction, the end plate is oppositely arranged with two in a second direction, the second direction is arranged at an angle with the first direction, the side plate and the end plate jointly form an accommodating cavity, the battery monomer is arranged in the accommodating cavity, and the surface of the side plate away from the battery monomer and the surface of the end plate away from the battery monomer are covered with the insulating layer.

[0007] In this way, the insulation protection effect of the battery monomer assembly is improved.

[0008] In an embodiment of the present application, the thickness of the insulating layer is defined as D1, and 0.125mm≤D1≤1mm.

[0009] In this way, on the one hand, effective insulation can be achieved, and on the other hand, cost can be reduced.

[0010] In an embodiment of the present application, the limiting assembly is insulatedly connected with the box.

[0011] In this way, the capacitance between the battery monomer assembly and the box of the battery device can be reduced.

[0012] In an embodiment of the present application, the limiting assembly is detachably connected with the box.

[0013] In this way, the user can conveniently disassemble, maintain, or replace the battery monomer assembly, thereby reducing the replacement cost.

[0014] In an embodiment of the present application, the limiting assembly is provided with a connecting plate, and the connecting plate is provided with a first connecting hole; the box is provided with an overlapping portion, and the overlapping portion is provided with a second connecting hole; the battery device further comprises a fastener and an insulation assembly, the fastener is arranged through the first connecting hole and the second connecting hole to fasten the connecting plate and the overlapping portion, and the connecting plate is insulated from the fastener and the overlapping portion.

[0015] In this way, the limiting assembly and the box are stably connected, the risk of mutual loosening of the two is reduced, and the risk of electric conduction between the connecting plate and the overlapping portion is also reduced, thereby achieving a better insulation effect.

[0016] In an embodiment of the present application, the battery device further comprises an insulating sleeve, a first insulating sheet, and a second insulating sheet. The insulating sleeve is embedded in the first connecting hole and arranged between the fastener and the inner wall of the first connecting hole. The first insulating sheet is arranged between the fastener and the surface of the connecting plate away from the overlapping portion. The second insulating sheet is arranged between the connecting plate and the overlapping portion.

[0017] In this way, the risk of electric conduction between the connecting plate and the overlapping portion through the fastener is reduced, and the risk of direct electric connection between the connecting plate and the overlapping portion is also reduced, thereby reducing the capacitance between the battery monomer assembly and the box.

[0018] In an embodiment of the present application, the first connecting hole comprises a first communicating section and a second communicating section, the second communicating section is away from the overlapping part, and the radial dimension of the second communicating section is greater than that of the first communicating section, and a step surface is formed between the first communicating section and the second communicating section. The insulating sleeve comprises a main cylinder and a limiting part. The main cylinder is located in the first communicating section. The limiting part is located in the second communicating section and abuts against the step surface.

[0019] In this way, the insulating sleeve can be inserted into the first connecting hole from the side of the connecting plate away from the overlapping part, and the limiting part and the step surface in the first connecting hole limit each other, thereby reducing the risk of the insulating sleeve coming out of the first connecting hole towards the overlapping part, and improving the stability of the insulating sleeve. In addition, in this way, the insulating sleeve and the connecting plate are in a separate structure, thereby facilitating replacement of the insulating sleeve.

[0020] In an embodiment of the present application, the first insulating sheet and the insulating sleeve are in an integrated structure; and / or, the second insulating sheet and the insulating sleeve are in an integrated structure.

[0021] In this way, the number of parts is reduced, thereby reducing the assembly process. In addition, in this way, the insulating effect of the fastener and the connecting plate is better.

[0022] In an embodiment of the present application, the thickness of the second insulating sheet is defined as D2, and 1mm≤D2≤2mm.

[0023] In this way, on the one hand, the second insulating sheet has sufficient strength and sufficient insulating performance when the fastener fastens the connecting plate and the overlapping part; on the other hand, the strength and the insulating performance of the second insulating sheet can be ensured while reducing the cost.

[0024] The present application also provides a kind of electric equipment, comprising the battery device described above. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings from the structures shown in the drawings without creative labor.

[0026] Figure 1 It is a structural schematic diagram of the vehicle of some embodiments of the present application;

[0027] Figure 2 It is an exploded structural schematic diagram of the battery device of some embodiments of the present application;

[0028] Figure 3 A exploded view of a battery cell for some embodiments of the application;

[0029] Figure 4 A structural view of an embodiment of a battery cell assembly for some embodiments of the application;

[0030] Figure 5 A Figure 4 A partial view of a cross-section of A-A;

[0031] Figure 6 A Figure 4 A partial view of a cross-section of B-B;

[0032] Figure 7 A cross-section of a battery cell assembly for some embodiments of the application after assembly of the battery cell, the case and the insulation assembly;

[0033] Figure 8 A Figure 7 A partial enlarged view at C.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1000, vehicle;

[0036] 100, battery device; 320, controller; 300, motor;

[0037] 10, case; 11, first part; 12, second part; 101, lap joint; 101a, second connecting hole;

[0038] 30, battery cell assembly; 31, limiting assembly; 311, side plate; 312, end plate; 3121, connecting plate; 3121a, first connecting hole; 32, battery cell; 321, end cover; 321a, electrode terminal; 322, shell; 323, electrode assembly; 323a, tab; 33, insulation layer;

[0039] 41, insulation sleeve; 411, main cylinder; 412, limiting portion; 42, first insulation sheet; 43, second insulation sheet;

[0040] 50, fastener.

[0041] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0042] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0043] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0044] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0045] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0046] The embodiments of the present application provide a power consumption equipment using a battery device as a power supply. The power consumption equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0047] The following embodiments take a power consumption equipment in an embodiment of the present application as a vehicle 1000 for example for convenient description.

[0048] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 320 and a motor 300, and the controller 320 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0049] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0050] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 includes a box body 10 and battery monomers 32, and the battery monomers 32 are contained in the box body 10. Among them, the box body 10 is used to provide a containing space for the battery monomers 32, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a containing space for containing the battery monomers 32 and a control module. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which is covered on the open side of the second part 12 to jointly define the containing space with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0051] Among them, each battery monomer 32 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery monomer 32 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0052] Please refer to Figure 3 , Figure 3This is an exploded structural diagram of a battery cell 32 provided in some embodiments of this application. The battery cell 32 refers to the smallest unit that makes up a battery device. Figure 3 The battery cell 32 includes an end cap 321, a housing 322, an electrode assembly 323, and other functional components.

[0053] End cap 321 refers to a component that covers the opening of housing 322 to isolate the internal environment of battery cell 32 from the external environment. The shape of end cap 321 can be adapted to the shape of housing 322 to fit it. Optionally, end cap 321 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 321 is not easily deformed under pressure and impact, giving battery cell 32 higher structural strength and improved safety performance. Functional components such as electrode terminals 321a can be provided on end cap 321. Electrode terminals 321a can be used for electrical connection with electrode assembly 323 for outputting or inputting electrical energy to battery cell 32. In some embodiments, end cap 321 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 32 reaches a threshold. The material of end cap 321 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 321. The insulating element can be used to isolate the electrical connection components within the housing 322 from the end cap 321 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0054] The housing 322 is an assembly used to cooperate with the end cap 321 to form the internal environment of the battery cell 32. This internal environment can accommodate the electrode assembly 323, electrolyte, and other components. The housing 322 and the end cap 321 can be independent components. An opening can be provided on the housing 322, and the end cap 321 can be used to close the opening to form the internal environment of the battery cell 32. Alternatively, the end cap 321 and the housing 322 can be integrated. Specifically, the end cap 321 and the housing 322 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 322, the end cap 321 closes the housing 322. The housing 322 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 322 can be determined according to the specific shape and size of the electrode assembly 323. The shell 322 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0055] The electrode assembly 323 is a component in which electrochemical reactions occur in the battery cell 32. One or more electrode assemblies 323 can be contained within the case 322. The electrode assembly 323 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 323, and portions without active materials that each constitute a tab 323a. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery device 100, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tabs 323a connect to electrode terminals to form a current loop.

[0056] In the battery device 100, the battery cells 32 can be multiple, and the multiple battery cells 32 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 32 are connected in series and in parallel. The multiple battery cells 32 can be directly connected in series, in parallel, or in a mixed connection, and the entire multiple battery cells 32 can be accommodated in the case 10. Of course, as shown, the battery device 100 can also be in a form in which the multiple battery cells 32 are first connected in series, in parallel, or in a mixed connection to form a battery cell assembly 30, and the multiple battery cell assemblies 30 are connected in series, in parallel, or in a mixed connection to form an entire assembly and are accommodated in the case 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current combining component for electrically connecting the multiple battery cells 32. Figure 4

[0057] ​The battery cell assembly 30 generally comprises a metal limiting assembly and a battery cell 32 contained by the metal limiting assembly. The limiting assembly can comprise a pair of end plates arranged opposite in a first direction, a pair of side plates arranged opposite in a second direction, and the second direction is arranged at an angle with the first direction, so that the end plates and the side plates together enclose a cavity for accommodating the battery cell 32. Y capacitor is a three-terminal capacitor, which is usually formed by connecting two capacitors in opposite directions, and there is a ground terminal in the middle. Specifically, in the present application, when the battery device 100 comprises a box 10, the battery cell assembly 30 generally comprises at least two, wherein the limiting assembly of at least two battery cell assemblies 30 forms a capacitor between the box 10 of the battery device 100, respectively, and a capacitor is also formed between the adjacent two battery cell assemblies 30, when the capacitors formed between the limiting assemblies of the at least two battery cell assemblies 30 and the box 10 of the battery device 100 are connected in opposite directions and the box 10 of the battery device 100 is grounded, the two battery cell assemblies 30 and the box 10 together form a Y capacitor. Whether the capacitance between the box 10 of the battery device 100 and the battery cell assembly 30 becomes larger or the capacitance between the two battery cell assemblies 30 that constitute the same Y capacitor becomes larger, the Y capacitor in the whole battery device 100 will become larger. When the Y capacitor is large, it will have adverse effects on the battery and the surrounding environment.

[0058] In order to reduce the capacitance between the adjacent two battery cell assemblies 30, please refer to Figures 4 to 6 The present application provides a battery device, which comprises a box 10 and at least two battery cell assemblies 30 contained in the box 10. Each battery cell assembly 30 comprises a battery cell 32, a limiting assembly 31 and an insulating layer 33. The battery cell 32 is stacked in multiple, and the limiting assembly 31 is arranged around the outer periphery of the multiple battery cells 32 to fix the multiple battery cells 32. The insulating layer 33 is arranged on the outer surface of the limiting assembly 31.

[0059] The battery cell assembly 30 refers to a module formed by connecting a plurality of battery cells 32 in series or parallel. At least two battery cell assemblies 30 can be provided in the battery device, and a plurality of battery cell assemblies 30 are connected in series or parallel or mixed to form a whole.

[0060] The limiting assembly 31 of the battery cell assembly 30 can be a cylinder, a cuboid, etc. The limiting assembly 31 of the battery cell assembly 30 is made of metal, such as aluminum or stainless steel, so as to facilitate heat dissipation. When the limiting assembly 31 of the battery cell assembly 30 is made of metal, a gap can be provided between the adjacent two battery cell assemblies 30 to reduce the risk of short circuit between the adjacent two battery cell assemblies 30.

[0061] The insulating layer 33 refers to a structure that has an insulating effect. The insulating layer 33 can be an insulating plate, an insulating sheet, an insulating film, or an insulating paint, etc. It can be provided on the outer surface of the limiting component 31 by spraying, extrusion, hot pressing, film pasting, etc. Taking the limiting component 31 as a cuboid as an example, the limiting component 31 can include side plates 311, end plates 312, a bottom plate, and a top cover, and the insulating layer 33 can be provided on the outer surface of all the plates of the limiting component 31, or can be provided only on the two surfaces opposite to each other of the adjacent two battery monomer assemblies 30. For example, if the plurality of battery monomer assemblies 30 are arranged only in the arrangement direction of a pair of end plates 312, the insulating layer 33 can be provided only on the outer surface of the end plates 312 of the limiting component 31; if the plurality of battery monomer assemblies 30 are arranged only in the arrangement direction of a pair of side plates 311, the insulating layer 33 can be provided only on the outer surface of the side plates 311 of the limiting component 31; if a part of the plurality of battery monomer assemblies 30 are arranged in the arrangement direction of a pair of end plates 312, and another part of the plurality of battery monomer assemblies 30 are arranged in the arrangement direction of a pair of side plates 311, the insulating layer 33 can be provided on the outer surface of the side plates 311 and the end plates 312 of the limiting component 31. Of course, in other examples, the insulating layer 33 can also be provided on all the outer surfaces of the limiting component 31. Specifically, the insulating layer 33 can be provided on the outer surfaces of different sides of the limiting component 31 by different process methods, for example, the insulating layer 33 can be provided on the outer surface of the side plates 311 of the limiting component 31 by spraying insulating paint, and the insulating layer 33 can be provided on the outer surface of the end plates 312 of the limiting component 31 by coating an insulating film. Of course, the insulating layer 33 can also be provided by the same process method. In addition, the insulating layer 33 on the outer surfaces of different sides of the limiting component 31 can be of different materials, or can be of the same material. It should be noted that the insulating material is common knowledge to those skilled in the art, and will not be described in detail here. The outer surface of the limiting component 31 refers to the surface of the limiting component 31 facing away from the battery monomer 32. For example, the surface of the side plate 311 facing away from the battery monomer 32 can be part of the outer surface of the limiting component 31; the surface of the end plate 312 facing away from the battery monomer 32 can be part of the outer surface of the limiting component 31, etc.

[0062] The technical scheme of the present application can increase the capacity of the battery device 100 and protect the battery monomer assembly 30 by containing at least two battery monomer assemblies 30 in the box 10. The plurality of battery monomers 32 in each battery monomer assembly 30 are stacked and arranged, and the limiting assembly 31 is arranged around the outer periphery of the plurality of battery monomers 32 to fix the plurality of battery monomers 32, which can realize the integrity of the plurality of series or parallel connected battery monomers 32 and further protect the battery monomers 32. By arranging the insulating layer 33 on the outer surface of the limiting assembly 31, the distance between the limiting assemblies 31 of at least two adjacent battery monomer assemblies 30 in the battery device can be increased, i.e. the distance between the two pole pieces is increased, thereby reducing the capacitance formed between the adjacent two battery monomer assemblies 30.

[0063] Please refer to Figures 4 to 6 In an embodiment of the present application, the limiting assembly 31 includes a side plate 311 and an end plate 312. The side plate 311 is oppositely arranged in the first direction. The end plate 312 is oppositely arranged in the second direction, and the second direction is arranged at an angle with the first direction. The side plate 311 and the end plate 312 jointly form an accommodating cavity, and the battery monomer 32 is arranged in the accommodating cavity. The surface of the side plate 311 away from the battery monomer 32 and the surface of the end plate 312 away from the battery monomer 32 are covered with an insulating layer 33.

[0064] The side plate 311 refers to a plate structure extending along the arrangement direction of the battery monomer 32. The two side plates 311 are oppositely arranged in the first direction, so that the two oppositely arranged side plates 311 can limit the battery monomer 32 in the first direction.

[0065] The end plate 312 refers to a plate body at an angle with the side plate 311. The two end plates 312 are oppositely arranged in the second direction, so that the two oppositely arranged end plates 312 can limit the plurality of battery monomers 32 in the arrangement direction of the plurality of battery monomers 32. The end plate 312 and the side plate 311 can be integrally formed, or can be connected by welding, or can be connected by screws, rivets, clamps, etc.

[0066] The accommodating cavity formed by the side plate 311 and the end plate 312 can be cylindrical, cuboid, etc.

[0067] By covering the surface of the side plate 311 away from the battery monomer 32 and the surface of the end plate 312 away from the battery monomer 32 with the insulating layer 33, the area covered by the insulating layer 33 of the limiting assembly 31 is larger, thereby improving the insulation protection effect of the battery monomer assembly 30, facilitating the arrangement of multiple battery monomer assemblies 30 in the first direction, and also allowing multiple battery monomer assemblies 30 to be arranged in the second direction, or allowing part of the multiple battery monomer assemblies 30 to be arranged in the first direction and the other part to be arranged in the second direction, thereby improving the flexibility of the arrangement of the battery monomer assembly 30, and regardless of whether the battery monomer assembly 30 is arranged in the first direction or the second direction, the distance between the limiting assemblies 31 of the adjacent two battery monomer assemblies 30 can be increased, thereby reducing the capacitance between the adjacent two battery monomer assemblies 30.

[0068] Please refer to Figure 5 and Figure 6 In an embodiment of the present application, the thickness of the insulating layer 33 is defined as D1, and 0.125mm≤D1≤1mm.

[0069] The thickness direction of the insulating layer 33 refers to the direction from the surface of the insulating layer 33 adhering to the limiting assembly 31 to the surface of the insulating layer 33 away from the limiting assembly 31.

[0070] Specifically, the thickness D1 of the insulating layer 33 can be 0.125mm, 0.15mm, 0.175mm, 1mm, etc.

[0071] By setting the thickness D1 of the insulating layer 33 to 0.125mm≤D1≤1mm, on the one hand, the thickness of the insulating layer 33 is sufficient, thereby achieving effective insulation effect of the limiting assembly 31 and increasing the distance between the limiting assemblies 31 of the adjacent two battery monomer assemblies 30, thereby effectively reducing the capacitance between the adjacent two battery monomer assemblies 30; on the other hand, based on the insulation of the insulating layer 33, the thickness thereof is not too thick, thereby reducing the cost.

[0072] Please refer to Figure 7 and Figure 8 In an embodiment of the present application, the limiting assembly 31 is insulatedly connected with the box body 10.

[0073] When the limiting assembly 31 of the battery monomer assembly 30 is arranged in the box body 10, it can be fixedly connected by a fixing member, or it can be stably arranged in the box body 10 by welding or other means. When the limiting assembly 31 is provided with the battery monomer 32, the battery monomer 32 can be provided in multiple, and the multiple battery monomers 32 can be stacked and arranged, and a partition plate can be arranged between the adjacent two battery monomers 32; or a heat dissipation flow channel can be arranged between the adjacent two battery monomers 32, so as to facilitate heat dissipation.

[0074] The limiting assembly 31 is insulatively connected with the box body 10, which means that the connection between the limiting assembly 31 and the box body 10 does not conduct electricity through a conductive medium. Specifically, when the limiting assembly 31 is insulatively connected with the box body 10, the limiting assembly 31 and the box body 10 can be connected through an insulating piece, for example, the limiting assembly 31 and the box body 10 are bonded through insulating glue; or the parts where the limiting assembly 31 and the box body 10 are connected and the parts where the box body 10 and the limiting assembly 31 are connected are both made of non-metallic materials; or when the limiting assembly 31 and the box body 10 are connected through a metal piece, insulating pieces are arranged between the metal piece and the limiting assembly 31 and between the metal piece and the box body 10 to achieve the effect of insulatively connecting the limiting assembly 31 with the box body 10.

[0075] By arranging the battery monomer assembly 30 in the box body 10 of the battery device, the box body 10 has a good protective effect on the battery monomer assembly 30. By insulatively connecting the limiting assembly 31 with the box body 10, the distance between the two polar plates between the limiting assembly 31 and the box body 10 can be increased, and thus the capacitance between the battery monomer assembly 30 and the box body 10 of the battery device can be reduced.

[0076] Please refer to Figure 7 and Figure 8 Based on the scheme that the limiting assembly 31 is insulatively connected with the box body 10, in an embodiment of the present application, the limiting assembly 31 is detachably connected with the box body 10.

[0077] Specifically, the limiting assembly 31 and the box body 10 can be connected by bolts, screws or buckles, etc. For example, when the limiting assembly 31 and the box body 10 are connected by bolts, the limiting assembly 31 and the box body 10 are both provided with through holes for the bolts, and the through holes on the limiting assembly 31 and the bolt holes on the box body 10 can be provided with insulating coatings or insulating sleeves, etc., and the limiting assembly 31 and the box body 10 can be insulatively isolated by an insulating gasket. Or the bolts can be made of non-metallic materials, and the limiting assembly 31 and the box body 10 can be insulatively isolated by an insulating gasket. When the limiting assembly 31 and the box body 10 are connected by buckles, one of the limiting assembly 31 and the box body 10 is provided with a buckle hole, and the other is provided with a buckle, and the buckle hole is provided with an insulating coating, an insulating film or an insulating sleeve, etc., and the buckle can also be provided with an insulating coating or an insulating film, etc.

[0078] By detachably connecting the limiting assembly 31 with the box body 10, it is convenient for the user to disassemble, maintain or repair the battery monomer assembly 30, so as to replace the battery monomer assembly 30, thereby reducing the replacement cost.

[0079] Please refer to Figure 4 , Figure 7 and Figure 8In an embodiment of the present application, the limiting assembly 31 is provided with a connecting plate 3121, and the connecting plate 3121 is provided with a first connecting hole 3121a; the box body 10 is provided with an overlapping portion 101, and the overlapping portion 101 is provided with a second connecting hole 101a; the battery device further comprises a fastener 50 and an insulation assembly, the fastener 50 is arranged through the first connecting hole 3121a and the second connecting hole 101a, so as to fasten and connect the connecting plate 3121 and the overlapping portion 101; the connecting plate 3121 is insulated from the fastener 50 and the overlapping portion 101 respectively.

[0080] The connecting plate 3121 refers to a plate structure used to connect with the box body 10. The connecting plate 3121 can be a metal plate or a non-metal plate. Specifically, the connecting plate 3121 can be arranged on the end plate 312, or can be arranged on the side plate 311, or can also be arranged at other positions.

[0081] The first connecting hole 3121a refers to a hole used for the fastener 50 to pass through. The inner wall of the first connecting hole 3121a can be a smooth inner wall, and at this time, the shape of the first connecting hole 3121a can be circular, rectangular or other irregular shapes. Alternatively, the first connecting hole 3121a can also be a threaded hole. It can be understood that when the first connecting hole 3121a is a threaded hole, the fastener 50 can be a bolt or a screw, etc.

[0082] The overlapping portion 101 refers to a part on the box body 10 used for the connecting plate 3121 to overlap. The overlapping portion 101 can be a plate-shaped body, a block-shaped body, etc. Specifically, the overlapping portion 101 can be a protruding block protruding from the inner wall of the box body 10, or the overlapping portion 101 is a beam structure which can be connected to the inner wall of the box body 10 through a stand column. The overlapping portion 101 can be a metal material or a non-metal material.

[0083] The second connecting hole 101a refers to a hole used for connecting with the fastener 50. The inner wall of the second connecting hole 101a can be a smooth inner wall, and at this time, the shape of the second connecting hole 101a can be circular, rectangular or other irregular shapes. Alternatively, the second connecting hole 101a can also be a threaded hole. It can be understood that when the first connecting hole 3121a is a threaded hole, the fastener 50 can be a bolt or a screw, etc.

[0084] The fastener 50 refers to a component used to connect the connecting plate 3121 and the overlapping portion 101 of the box body 10 together. The fastener 50 can be a bolt, a screw, a rivet or a press buckle, etc.

[0085] The connecting plate 3121 is insulated from the fastener 50 and the overlapping portion 101, respectively, which means that an insulating member can be arranged between the fastener 50 and the first connecting hole 3121a, between the fastener 50 and the surface of the connecting plate 3121 away from the overlapping portion 101, and between the connecting plate 3121 and the overlapping portion 101, so as to ensure that the connecting plate 3121 is insulated from the overlapping portion 101 when the fastener 50 connects the connecting plate 3121 and the overlapping portion 101. Alternatively, the fastener 50 itself is an insulating member, etc.

[0086] By arranging the first connecting plate 3121 on the limiting assembly 31, the first connecting plate 3121 is provided with the connecting hole 3121a, the overlapping portion 101 arranged on the box body 10 is provided with the second connecting hole 101a, the fastener 50 is arranged through the first connecting hole 3121a and the second connecting hole 101a, and the connecting plate 3121 and the overlapping portion 101 are fastened and connected, so as to realize the effect of stably connecting the limiting assembly 31 and the box body 10 and reducing the risk of mutual loosening of the two. Meanwhile, by insulating the connecting plate 3121 from the fastener 50 and the overlapping portion 101, respectively, the risk of electric conduction between the connecting plate 3121 and the overlapping portion 101 is also reduced, thereby realizing a better insulation effect.

[0087] Please refer to Figure 4 , Figure 7 and Figure 8 In an embodiment of the present application, the battery device further comprises an insulating sleeve 41, a first insulating sheet 42, and a second insulating sheet 43. The insulating sleeve 41 is embedded in the first connecting hole 3121a and arranged between the fastener 50 and the inner wall of the first connecting hole 3121a. The first insulating sheet 42 is clamped between the fastener 50 and the surface of the connecting plate 3121 away from the overlapping portion 101. The second insulating sheet 43 is clamped between the connecting plate 3121 and the overlapping portion 101.

[0088] The insulating sleeve 41 is an insulating member in the form of a cylindrical body. The insulating sleeve 41 can be made of plastic, rubber, or metal containing insulating paint, etc. When the insulating sleeve 41 is embedded in the first connecting hole 3121a, it can be sleeved into the first connecting hole 3121a in the form of interference fit; it can also be embedded in the first connecting hole 3121a by injection molding to ensure a more stable connection effect with the inner wall of the first connecting hole 3121a; or it can also be embedded in the first connecting hole 3121a by limiting clamping. The inner wall of the insulating sleeve 41 can be a smooth inner wall, or can be provided with threads.

[0089] The first insulating sheet 42 refers to a component arranged on the surface of the connecting plate 3121 away from the lap joint portion 101 to isolate the connecting plate 3121 and the fastener 50 from each other on the surface of the connecting plate 3121 away from the lap joint portion 101. The first insulating sheet 42 can be an electrophoretic sheet, i.e., a sheet with an insulating paint deposited on a metal sheet by an electrophoretic process. Alternatively, the first insulating sheet 42 can also be a plastic sheet or a rubber sheet, etc.

[0090] The second insulating sheet 43 refers to a component directly used to insulate the connecting plate 3121 and the lap joint portion 101. The second insulating sheet 43 can be connected to the side of the connecting plate 3121 facing the lap joint portion 101; or the second insulating sheet 43 can be connected to the side of the lap joint portion 101 facing the connecting plate 3121; or the second insulating sheet 43 is not connected to the connecting plate 3121 and the lap joint portion 101, but only abuts against the side of the connecting plate 3121 facing the lap joint portion 101 and the side of the lap joint portion 101 facing the connecting plate 3121. Specifically, the fastener 50 can pass through the second insulating sheet 43, or the fastener 50 can not pass through the second insulating sheet 43. It can be understood that when the fastener 50 passes through the second insulating sheet 43, the fastener 50 can have good positioning on the second insulating sheet 43, thereby reducing the risk of the second insulating sheet 43 moving between the connecting plate 3121 and the lap joint portion 101.

[0091] By embedding the insulating sleeve 41 into the first connecting hole 3121a and arranging it between the fastener 50 and the first connecting hole 3121a, the fastener 50 is isolated from the connecting hole 3121a on the connecting plate 3121. By clamping the first insulating sheet 42 between the fastener 50 and the surface of the connecting plate 3121 away from the lap joint portion 101, the fastener 50 is isolated from the entire connecting plate 3121, thereby reducing the risk of the connecting plate 3121 conducting electricity with the lap joint portion 101 through the fastener 50. By clamping the second insulating sheet 43 between the connecting plate 3121 and the lap joint portion 101, the risk of the connecting plate 3121 directly electrically connecting with the lap joint portion 101 can be reduced, thereby reducing the capacitance between the battery cell assembly 30 and the box body 10.

[0092] Please refer to Figure 4 , Figure 7 and Figure 8 In an embodiment of the present application, the first connecting hole 3121a includes a first communicating section and a second communicating section, the second communicating section is away from the lap joint portion, and the radial dimension of the second communicating section is greater than the radial dimension of the first communicating section, and a stepped surface is formed between the first communicating section and the second communicating section; the insulating sleeve 41 includes a main cylinder 411 and a limiting portion 412. The main cylinder 411 is located in the first communicating section. The limiting portion 412 is located in the second communicating section and abuts against the stepped surface.

[0093] The main cylinder 411 refers to a main body portion for insertion into the first connecting hole 3121a. The main cylinder 411 can be a straight cylinder or a stepped shape. The cross-sectional shape of the main cylinder 411 can be cylindrical, prismatic or other shapes. The cross-sectional shape of the main cylinder 411 can be the same as the shape of the first communication section in the first connecting hole 3121a, or it can be different. It can be understood that when the cross-sectional shape of the main cylinder 411 is the same as the shape of the first communication section, the installation of the insulating sleeve 41 in the first connecting hole 3121a is more stable.

[0094] The limiting portion 412 refers to a portion for mutual limiting with the stepped surface. The limiting portion 412 can be a ring or a cylindrical body, or the limiting portion 412 can be a barb shape, etc.

[0095] In this way, the insulating sleeve 41 can be inserted into the first connecting hole 3121a from the side of the connecting plate 3121 away from the lap joint portion 101, and the limiting portion 412 can be limited with the stepped surface in the first connecting hole 3121a, thereby reducing the risk of the insulating sleeve 41 coming out of the first connecting hole 3121a towards the lap joint portion 101, and improving the stability of the insulating sleeve 41. In addition, in this way, the insulating sleeve 41 and the connecting plate 3121 are in a split structure, thereby facilitating the replacement of the insulating sleeve 41.

[0096] In an embodiment of the present application, the first insulating sheet 42 and the insulating sleeve 41 are in an integrated structure; and / or, the second insulating sheet 43 and the insulating sleeve 41 are in an integrated structure.

[0097] Specifically, the first insulating sheet 42 and the insulating sleeve 41 are in an integrated structure, and the second insulating sheet 43 and the insulating sleeve 41 are in a split structure; or the first insulating sheet 42 and the insulating sleeve 41 are in a split structure, and the second insulating sheet 43 and the insulating sleeve 41 are in an integrated structure; or the first insulating sheet 42 and the insulating sleeve 41 are in an integrated structure, and the second insulating sheet 43 and the insulating sleeve 41 are also in an integrated structure.

[0098] In this way, the insulating sleeve 41 is not easy to slide out of the first connecting hole 3121a during installation, and the number of parts is reduced, thereby reducing the assembly process. In addition, in this way, the fastener 50 and the connecting plate 3121 have better insulation effect.

[0099] Please refer to Figure 7 and Figure 8 In an embodiment of the present application, the thickness of the second insulating sheet 43 is defined as D2, and 1mm≤D2≤2mm.

[0100] The thickness direction of the second insulating sheet 43 refers to the direction from the side of the connecting plate 3121 towards the lap joint portion 101 to the side of the lap joint portion 101 towards the connecting plate 3121.

[0101] Specifically, the thickness D2 of the second insulating sheet 43 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm, etc.

[0102] By setting the thickness D2 of the second insulating sheet 43 to 1 mm≤D2≤2 mm, on the one hand, the second insulating sheet 43 has sufficient strength when the fastener 50 fastens the connecting plate 3121 and the lap joint portion 101, and has sufficient insulation performance; on the other hand, the strength and insulation performance of the second insulating sheet 43 can be ensured while reducing the cost.

[0103] The application further provides a power-using device. As shown in the drawings, the power-using device comprises the battery device 100, and the specific structure of the battery device 100 refers to the above-mentioned embodiments. Since the power-using device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Specifically, the power-using device can be any device or system using the battery device 100. Figure 1

[0104] The above is only an exemplary embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, which is made under the technical concept of the application, using the content of the specification and drawings, is included in the patent protection scope of the application.​

Claims

1. A battery device, characterized by, The battery device comprises: a box body; at least two battery cell assemblies accommodated in the box body, each of the battery cell assemblies comprising: a plurality of battery cells stacked; a limiting assembly surrounding an outer periphery of the plurality of battery cells to fix the plurality of battery cells; and an insulating layer provided on an outer surface of the limiting assembly.

2. The battery device of claim 1, wherein The limiting assembly comprises: two side plates oppositely arranged in a first direction; and two end plates oppositely arranged in a second direction, the second direction being arranged at an angle with the first direction, the side plates and the end plates jointly forming an accommodating cavity in which the battery cells are arranged. Surfaces of the side plates and surfaces of the end plates away from the battery cells are covered with the insulating layer.

3. The battery device of claim 1, wherein The thickness of the insulating layer is defined as D1, and 0.125mm≤D1≤1mm.

4. The battery device according to any one of claims 1 to 3, wherein The limiting assembly is insulatedly connected with the box body.

5. The battery device of claim 4, wherein The limiting assembly is detachably connected with the box body.

6. The battery device of claim 5, wherein A connecting plate is provided on the limiting assembly, and a first connecting hole is provided on the connecting plate. The box body is provided with a lapping portion, and a second connecting hole is provided on the lapping portion. The battery device further comprises a fastener, the fastener being arranged through the first connecting hole and the second connecting hole to fasten the connecting plate and the lapping portion, and the connecting plate is insulated from the fastener and the lapping portion.

7. The battery device of claim 6, wherein The battery device further comprises: an insulating sleeve embedded in the first connecting hole and arranged between the fastener and an inner wall of the first connecting hole; a first insulating sheet clamped between the fastener and a surface of the connecting plate away from the lapping portion; and a second insulating sheet clamped between the connecting plate and the lapping portion.

8. The battery device of claim 7, wherein The first connecting hole comprises a first communicating section and a second communicating section, the second communicating section being away from the lapping portion, and a radial dimension of the second communicating section being greater than a radial dimension of the first communicating section, and a step surface being formed between the first communicating section and the second communicating section. The insulating sleeve comprises: a main cylinder arranged in the first communicating section; and 9. The battery device of claim 7, wherein a limiting portion arranged in the second communicating section and abutting against the step surface.

10. The battery device of claim 7, wherein The first insulating sheet and the insulating sleeve are in an integrated structure; and / or, the second insulating sheet and the insulating sleeve are in an integrated structure.

11. An electrical device, characterized by The thickness of the second insulating sheet is defined as D2, and 1mm≤D2≤2mm. The battery device comprises any one of claims 1 to 10.

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