Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a battery monomer and a protection structure, the battery monomer comprises a shell and an electrode assembly arranged in the shell, the shell comprises a bottom plate and a side wall arranged around the bottom plate, and the bottom plate is used for supporting the electrode assembly; and the protection structure is used for supporting the battery monomers and at least wraps the corners of the side walls. The reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

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

[0002] In recent years, with the rapid development of new energy technology, new energy vehicles are more and more widely used, and gradually replace traditional fuel vehicles to become one of the mainstream transportation tools. As the power source of new energy vehicles, power batteries are one of the core equipment of new energy vehicles, therefore, the safety performance of power batteries becomes the focus of attention.

[0003] In the development of battery technology, how to improve the reliability of the battery device is a research direction in the battery technology. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery device and a power utilization device, which can improve the reliability of the battery device.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which comprises a battery monomer and a protection structure, the battery monomer comprises a shell and an electrode assembly arranged in the shell, the shell comprises a bottom plate and a side wall arranged around the bottom plate, the bottom plate is used for supporting the electrode assembly; the protection structure is used for supporting the battery monomer, and the protection structure at least wraps the corner of the side wall.

[0006] In the above scheme, the protection structure supports the battery monomer, and the protection structure at least wraps the corner of the side wall of the shell, which protects the position of the battery monomer most prone to deformation, reduces the risk of deformation of the shell, and to some extent avoids the corner of the bottom of the shell from piercing other battery monomers, reduces the safety hazard, and thus improves the reliability of the battery monomer.

[0007] In some embodiments, the side wall comprises two oppositely arranged first side walls and two oppositely arranged second side walls, the first side wall and the second side wall are connected to each other; the protection structure comprises a support plate and a protection piece, the support plate is used for supporting the bottom plate; the protection piece is connected with the support plate, at least part of the protection piece is used for wrapping the corner of the side wall and is in contact with the first side wall and the second side wall respectively.

[0008] In the above scheme, through the cooperation of the bottom plate and the protection piece, the support of the bottom plate of the battery monomer is increased, and the first side wall and the second side wall of the side wall are wrapped, which can further reduce the risk of deformation of the shell and further improve the reliability of the battery monomer.

[0009] In some embodiments, a plurality of protection pieces are respectively arranged at a plurality of corners of the battery monomer, each protection piece comprises a first protection part and a second protection part connected to each other, the first protection part is in contact with the first side wall, and the second protection part is in contact with the second side wall.

[0010] In the above scheme, by arranging a separate protective piece at each corner, each corner can be better protected, reducing the risk of deformation at the corner, and further reducing the probability of the corner of the bottom of the shell piercing other battery monomers.

[0011] In some embodiments, the protective piece is arranged in a ring around the periphery of the side wall.

[0012] In the above scheme, the protective piece not only wraps the corners, but also wraps other positions of the first side wall and the second side wall, expanding the protection range.

[0013] In some embodiments, at least part of the support plate is hollow, which can reduce the weight of the entire battery device.

[0014] In some embodiments, the number of battery monomers is multiple, and the support plate is used to support the bottom plate of the multiple battery monomers, facilitating the assembly of the battery device.

[0015] In some embodiments, the number of protective pieces is multiple, and the multiple protective pieces are separated to form multiple accommodation grooves, and the multiple battery monomers are sequentially accommodated in the multiple accommodation grooves, so that each battery monomer can be individually protected.

[0016] In some embodiments, the protective piece forms one accommodation groove, and multiple battery monomers are accommodated in one accommodation groove, which can reduce the gap between the battery monomers, thereby improving the energy density of the battery device.

[0017] In some embodiments, the protective structure includes multiple protective pieces, and each protective piece is arranged at multiple corners of the battery monomer.

[0018] In the above scheme, the corners are protected by separate protective pieces, which can reduce the material and weight.

[0019] In some embodiments, the bottom plate and the side wall are welded to form a weld protrusion, and the protective structure wraps at least part of the weld protrusion.

[0020] In the above scheme, the weld protrusion is protected by the protective structure, which can reduce the risk of the weld protrusion piercing other battery monomers, thereby further improving the reliability of the battery monomer.

[0021] In some embodiments, the protective structure is provided with a protruding portion on the side away from the shell.

[0022] In the above scheme, the protruding portion can increase the friction when the battery monomer contacts the external component, thereby improving the stability of the battery monomer.

[0023] In some embodiments, the thickness of the protective structure is D, and D satisfies the following condition: 0.05mm≤D≤1mm.

[0024] In the above solution, by setting the thickness of the protection structure in an appropriate range, the protection effect of the protection structure can be achieved, and the battery device is not occupied by too much space, and the energy density of the battery device is not affected.

[0025] In some embodiments, D satisfies the following condition: 0.05mm≤D≤0.1mm.

[0026] In the above solution, by further limiting the thickness range of the protection structure, the influence of the protection structure on the energy density of the battery device is further reduced.

[0027] In some embodiments, the height of the protection structure is H1, the height of the battery monomer is H2, and H1 and H2 satisfy: 0.01%≤H1 / H2≤10%.

[0028] In the above solution, by setting the height of the protection structure in an appropriate range, the protection effect of the protection structure can be achieved, and the battery device is not occupied by too much space, and the energy density of the battery device is not affected.

[0029] In some embodiments, H1 and H2 satisfy: 2%≤H1 / H2≤3%.

[0030] In the above solution, by further limiting the thickness range of the protection structure, the influence of the protection structure on the energy density of the battery device is further reduced.

[0031] In some embodiments, the material of the protection structure is any one of steel, iron, silica gel or polycarbonate.

[0032] In the above solution, the material of the protection structure can be selected according to different needs, and the versatility of the protection structure is expanded.

[0033] In a second aspect, the embodiments of the present application also provide a power consumption device, which comprises the battery device of any of the above embodiments, and the battery device is used to provide electric energy.

[0034] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0036] Figure 1 Structural diagram of a vehicle for some embodiments of the present application;

[0037] Figure 2 Exploded view of a battery device for some embodiments of the present application;

[0038] Figure 3 Structural diagram of a battery module for some embodiments of the present application;

[0039] Figure 4 Exploded structural diagram of a battery cell for some embodiments of the present application;

[0040] Figure 5 Structural diagram of a housing for some embodiments of the present application;

[0041] Figure 6 Assembly diagram of a battery cell and a protection structure for some embodiments of the present application;

[0042] Figure 7 Assembly diagram of a battery cell and a protection structure for some embodiments of the present application;

[0043] Figure 8 Figure 6 Diagram from another angle;

[0044] Figure 9 Assembly diagram of a battery cell and a protection structure for some embodiments of the present application;

[0045] Figure 10 Assembly diagram of a plurality of battery cells and a protection structure for some embodiments of the present application;

[0046] Figure 11 Diagram of a protection structure for some embodiments of the present application;

[0047] Figure 12 Top view of a protection structure for some embodiments of the present application;

[0048] Figure 13 Assembly diagram of a battery cell and a protection structure for some embodiments of the present application;

[0049] Figure 14 Diagram of a protection structure for some embodiments of the present application;

[0050] Figure 15 Assembly diagram of a battery cell and a protection structure for some embodiments of the present application.

[0051] BRIEF DESCRIPTION OF THE DRAWINGS:

[0052] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, box body; 400, battery module; 20, battery cell; 21, end cover; 22, shell; 23, electrode assembly; 26, electrode terminal; 27, bottom plate; 28, side wall; 281, first side wall; 282, second side wall; 29, corner; 40, protection structure; 41, support plate; 42, protection piece; 421, first protection part; 422, second protection part; 423, accommodating groove. DETAILED DESCRIPTION

[0053] The embodiments of the present application will be further described in conjunction with the drawings and examples. The detailed description and drawings of the following examples are intended to illustrate the principles of the present application, but should not be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0054] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like merely indicates or suggests the orientation or positional relationship in the drawings and simplifies the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0055] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0056] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the present application. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, the battery cell can include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc. The present application embodiments are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The present application embodiments are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, etc. The present application embodiments are not limited thereto.

[0058] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0059] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0060] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0061] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0062] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0063] The present application embodiments provide a power consumption device using a battery as a power source, which can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0064] At present, the demand for the energy density of the battery cell is getting higher and higher, so there are battery cells with thin shells made of steel shells, which make the utilization space inside the shell large, thereby improving the energy density of the battery cell. However, the thin shell is relatively fragile, and slight bumps can cause deformation, and if damaged, it can cause risks such as exposure of the electrode assembly and leakage of electrolyte, reducing the reliability of the battery cell.

[0065] In order to solve the above technical problems, the battery device provided by the embodiment of the present application supports the battery monomer through the protection structure, and the protection structure at least wraps the corner of the side wall of the shell, thereby protecting the position of the battery monomer which is most prone to deformation, reducing the risk of deformation of the shell, and to some extent avoiding the corner of the bottom of the shell from piercing other battery monomers, reducing the security risk, thereby improving the reliability of the battery monomer.

[0066] The following embodiments take a vehicle 1000 as an example for the purpose of convenient description.

[0067] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the vehicle provided by some embodiments of the present application is shown. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile 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, the head or the 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 the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0068] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0069] Please refer to Figure 2 , Figure 2 The exploded view of the device provided by some embodiments of the present application is shown. The battery device 100 includes a battery box and a battery monomer 20. In some embodiments, the battery box can include an upper cover 10 and a box 30, the upper cover 10 and the box 30 are covered with each other, and the upper cover 10 and the box 30 jointly define a containing cavity for containing the battery monomer 20. The box 30 can be a hollow structure with one end open, and the upper cover 10 can be a plate-shaped structure, the upper cover 10 is covered on the open side of the box 30, so that the upper cover 10 and the box 30 jointly define the containing cavity; the upper cover 10 and the box 30 can also be hollow structures with one side open, and the open side of the upper cover 10 is covered on the open side of the box 30. Of course, the battery box formed by the upper cover 10 and the box 30 can have various shapes, such as a cylinder, a cuboid, etc.

[0070] Figure 3A structural schematic diagram of a battery module according to some embodiments of the present application. In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in the box. Of course, the battery device 100 can also be in the form that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed manner to form a battery module 400, and the multiple battery modules 400 are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in the box. The battery device 100 can also include other structures. For example, the battery device 100 can also include a current collecting component for realizing electrical connection between the multiple battery cells 20.

[0071] Each battery cell 20 can be a secondary battery cell or a primary battery cell, and can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0072] Please refer to Figure 4 , Figure 4 A disassembled structural schematic diagram of a battery cell according to some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components.

[0073] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easy to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as an electrode terminal 26. The electrode terminal 26 can be used for electrical connection with the electrode assembly 23 for output or input of the electrical energy of the battery cell 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0074] Figure 5is a structural schematic diagram of a shell of some embodiments of the present application; Figure 6 is an assembly schematic diagram of a battery monomer and a protection structure of some embodiments of the present application.

[0075] Please refer to Figure 5 and Figure 6 In the first aspect, the embodiments of the present application provide a battery device 100, the battery device 100 comprises a battery monomer 20 and a protection structure 40, the battery monomer 20 comprises a shell 22 and an electrode assembly 23 arranged inside the shell 22, the shell 22 comprises a bottom plate 27 and a side wall 28 arranged around the bottom plate 27, the bottom plate 27 is used to support the electrode assembly 23; the protection structure 40 is used to support the battery monomer 20, and the protection structure 40 at least wraps the corner 29 of the side wall 28.

[0076] The shell 22 can be a thin shell 22 made of steel, of course, materials such as aluminum alloy, magnesium alloy, etc. can also be used.

[0077] The shell 22 can be a cuboid or a square, etc. Correspondingly, the bottom plate 27 is also a rectangle or a square. The side wall 28 is a cuboid or a square with openings at both ends. The electrode assembly 23 is placed on the bottom plate 27 of the shell 22, supporting the electrode assembly 23, and the side wall 28 is arranged around the outer periphery of the electrode assembly 23.

[0078] The corner 29 of the side wall 28 refers to the corner 29 of the bottom of the shell, that is, the corner 29 where the bottom plate 27 and the side wall 28 are connected.

[0079] The protection structure 40 can be a protection sleeve or other protection member 42 structure that protects the corner 29 alone, and can also have the function of supporting the battery monomer 20. Or the protection structure 40 can be an integral whole, and a plurality of protection members 42 are arranged on a support plate 41, the support plate 41 supports the bottom plate 27, and the protection member 42 protects the corner 29 or can also protect other positions of the side wall 28. Or the protection structure 40 can also be an integral whole, which protects a plurality of battery monomers 20 at the same time.

[0080] In the above scheme, the battery monomer 20 is supported by the protection structure 40, and the protection structure 40 at least wraps the corner 29 of the side wall 28 of the shell 22, which protects the position of the battery monomer 20 that is most prone to deformation, reduces the risk of deformation of the shell 22, and to some extent avoids the corner 29 of the bottom of the shell 22 piercing other battery monomers 20, reduces the safety hidden danger, thereby improving the reliability of the battery monomer 20.

[0081] In some embodiments, the side wall 28 comprises two oppositely arranged first side walls 281 and two oppositely arranged second side walls 282, the first side wall 281 and the second side wall 282 being connected to each other; the protection structure 40 comprises a support plate 41 and a protection piece 42, the support plate 41 being used for supporting the bottom plate 27; the protection piece 42 is connected to the support plate 41, and at least a part of the protection piece 42 is used for wrapping the corner 29 of the side wall 28 and is in contact with the first side wall 281 and the second side wall 282, respectively.

[0082] The protection structure 40 can be an integrally formed structure, or the protection piece 42 and the support plate 41 can also be independent components and are assembled into the protection structure 40.

[0083] The support plate 41 is located below the bottom plate 27 and is used for supporting the weight of the entire battery monomer 20. The shape of the support plate 41 is the same as or similar to the shape of the bottom plate 27, the size of the support plate 41 is the same as the size of the bottom plate 27, or the size of the support plate 41 can be slightly larger than the size of the bottom plate 27. A separate support plate 41 can be provided for each battery monomer 20, or a plurality of battery monomers 20 can share one support plate 41.

[0084] The number of protection pieces 42 can be one or more, which are used for protecting one corner 29 or a plurality of corners 29 of the shell 22 of one battery monomer 20. Alternatively, a plurality of battery monomers 20 can be assembled, and only the corners 29 of the battery monomers 20 located at both ends are protected by the protection pieces 42.

[0085] In the above scheme, through the cooperation of the bottom plate 27 and the protection piece 42, the support of the bottom plate 27 of the battery monomer 20 is increased, and the wrapping of the first side wall 281 and the second side wall 282 of the side wall 28 is increased, which can further reduce the risk of deformation of the shell 22 and further improve the reliability of the battery monomer 20.

[0086] In some embodiments, a plurality of protection pieces 42 are respectively arranged at a plurality of corners 29 of the battery monomer 20, each protection piece 42 comprising a first protection part 421 and a second protection part 422 connected to each other, the first protection part 421 being in contact with the first side wall 281, and the second protection part 422 being in contact with the second side wall 282.

[0087] The intersection of the bottom plate 27, the first side wall 281 and the second side wall 282 is the corner 29 of the shell.

[0088] The included angle between the first protection part 421 and the second protection part 422 can be the same as the included angle between the first side wall 281 and the second side wall 282. For example, the first side wall 281 and the second side wall 282 are perpendicular to each other, and the first protection part 421 and the second protection part 422 can also be perpendicular to each other and are respectively attached to the outer surfaces of the first side wall 281 and the second side wall 282.

[0089] In the above scheme, by arranging a separate protective member 42 at each corner 29, the corner 29 can be better protected, the risk of deformation at the corner 29 can be reduced, and the probability of the corner 29 of the bottom of the shell 22 piercing other battery monomers 20 can be further reduced.

[0090] Figure 7 is an assembly diagram of a battery monomer and a protective structure according to some embodiments of the present application; and Figure 8 Figure 6 is a schematic view from another angle.

[0091] Please refer to Figure 7 and Figure 8 In some embodiments, the protective member 42 is arranged in a ring around the periphery of the side wall 28.

[0092] The protective member 42 can be arranged in a ring around the periphery of the side wall 28.

[0093] In the above scheme, the protective member 42 not only wraps the corner 29, but also wraps other positions of the first side wall 281 and the second side wall 282, thereby expanding the protection range.

[0094] Figure 9 is an assembly diagram of a battery monomer and a protective structure according to some embodiments of the present application.

[0095] As shown in Figure 9 In some embodiments, at least part of the support plate 41 is hollow.

[0096] The support plate 41 can be perforated at the middle position, i.e., hollow, and the battery monomer 20 is supported by the edge part which is not perforated. The number of perforations can be one or more.

[0097] In the above scheme, by arranging at least part of the support plate 41 to be hollow, the weight of the entire battery device 100 can be reduced.

[0098] Figure 10 is an assembly diagram of a plurality of battery monomers and a protective structure according to some embodiments of the present application.

[0099] As shown in Figure 10 In some embodiments, the number of battery monomers 20 is multiple, and the support plate 41 is used to support the bottom plate 27 of the multiple battery monomers 20, thereby facilitating the assembly of the battery device 100.

[0100] Figure 11 is a schematic view of a protective structure according to some embodiments of the present application.

[0101] As shown in Figure 11As shown, in some embodiments, the number of the protection members 42 is multiple, and the multiple protection members 42 are separated to form multiple accommodation slots 423, and the multiple battery monomers 20 are sequentially and correspondingly accommodated in the multiple accommodation slots 423.

[0102] That is, each battery monomer 20 is protected by a corresponding protection member 42. When assembling the battery device 100, each battery monomer 20 is only needed to be placed in each accommodation slot 423.

[0103] In the above scheme, by sequentially and correspondingly accommodating the multiple battery monomers 20 in the multiple accommodation slots 423, each battery monomer 20 can be individually protected.

[0104] Figure 12 is a top view of the protection structure of some other embodiments of the present application.

[0105] As Figure 12 shown, in some embodiments, the protection member 42 forms one accommodation slot 423, and the multiple battery monomers 20 are accommodated in one accommodation slot 423.

[0106] When assembling the battery device 100, the multiple battery monomers 20 are tightly attached to each other. The protection member 42 can not be arranged between the two adjacent battery monomers 20, and is only arranged at both ends along the arrangement direction of the battery monomers 20, or the protection member 42 is in a ring structure arranged along the circumferential direction of the multiple battery monomers 20.

[0107] In the above scheme, by accommodating the multiple battery monomers 20 in one accommodation slot 423, the gap between the battery monomers 20 can be reduced, thereby improving the energy density of the battery device 100.

[0108] Figure 13 is an assembly schematic view of the battery monomer and the protection structure of some other embodiments of the present application; Figure 14 is a schematic view of the protection structure of some other embodiments of the present application.

[0109] Please refer to Figure 13 and Figure 14 , in some other embodiments, the protection structure 40 includes multiple protection members 42, and each protection member 42 is correspondingly arranged at the multiple corners 29 of the battery monomer 20.

[0110] That is, the support plate 41 can not be arranged, and the protection member 42 is an independent structure, and the protection member 42 can be wrapped at each corner 29 of the shell of the battery monomer 20. Each protection member 42 can be composed of three mutually perpendicular plates, which are in contact with the bottom plate 27, the first side wall 281 and the second side wall 282 of the shell 22. The protection member 42 can not only protect the corner 29, but also support a certain weight of the battery monomer 20.

[0111] In the above scheme, the corner 29 is protected by the separate protection member 42, which can reduce the material and reduce the weight.

[0112] In some embodiments, the bottom plate 27 is welded with the side wall 28 to form a weld protrusion, and the protection structure 40 wraps at least part of the weld protrusion.

[0113] In the manufacturing process of the battery cell 20 of the thin shell 22, the welding process is a key step to connect the parts of the shell 22 together. For example, when laser welding or resistance welding is used, heat is generated during the welding process, causing the metal material in the welding area to melt and solidify. During the solidification process of the welding pool, the surface tension of the liquid metal and the solidification shrinkage will cause the material to accumulate at the weld. Just like pouring water from a kettle into a small container, when the water solidifies at the edge of the container, an edge higher than the plane inside the container is formed. When welding the shell 22 of the battery cell 20, this material accumulation is manifested as a protrusion of the weld, i.e. a weld protrusion.

[0114] For example, when the bottom plate 27 is welded with the side wall 28, a weld protrusion is formed. Therefore, the protection structure 40 can wrap the weld protrusion between the bottom plate 27 and the side wall 28.

[0115] In the above scheme, the weld protrusion is protected by the protection structure 40, which can reduce the risk of the weld protrusion scratching other battery cells 20, thereby further improving the reliability of the battery cell 20.

[0116] In some embodiments, the side of the protection structure 40 away from the shell 22 is provided with a protruding part.

[0117] The protruding part can be spherical, conical, or the like. The protruding part can increase the friction when the battery cell 20 contacts the external components, thereby improving the stability of the battery cell 20.

[0118] In some embodiments, the thickness of the protection structure 40 is D, which satisfies the following condition: 0.05mm≤D≤1mm.

[0119] The thickness of the protection structure 40 can be any value within 0.05mm-1mm. For example, the thickness of the protection structure 40 can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, or 1mm, etc.

[0120] In the above scheme, by setting the thickness of the protection structure 40 within an appropriate range, the protection effect of the protection structure 40 can be achieved, and the battery device 100 does not occupy too much space, and the energy density of the battery device 100 is not affected.

[0121] In some embodiments, D satisfies the following condition: 0.05mm≤D≤0.1mm.

[0122] The thickness of the protective structure 40 can be any value in the range of 0.05mm-0.1mm. For example, the thickness of the protective structure 40 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.

[0123] In the above scheme, by further limiting the thickness range of the protective structure 40, the influence of the protective structure 40 on the energy density of the battery device 100 is further reduced.

[0124] Figure 15 is an assembly diagram of a battery cell and a protective structure according to some other embodiments of the present application.

[0125] As shown in Figure 15 In some embodiments, the height of the protective structure 40 is H1, and the height of the battery cell 20 is H2, and H1 and H2 satisfy the following condition: 0.01%≤H1 / H2≤10%.

[0126] The ratio of the height of the protective structure 40 to the height of the battery cell 20 can be any value in the range of 0.01%-10%. For example, the thickness of the protective structure 40 can be 0.01%, 1%, 2%, 3%, 4%, 5%, 7%, 9%, or 10%, etc.

[0127] In the above scheme, by setting the height of the protective structure 40 within an appropriate range, the protection effect of the protective structure 40 can be achieved, and the battery device 100 is not occupied by too much space, and the energy density of the battery device 100 is not affected.

[0128] In some embodiments, H1 and H2 satisfy the following condition: 2%≤H1 / H2≤3%.

[0129] The ratio of the height of the protective structure 40 to the height of the battery cell 20 can be any value in the range of 2%-3%. For example, the thickness of the protective structure 40 can be 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, or 2.9%, etc.

[0130] In the above scheme, by further limiting the thickness range of the protective structure 40, the influence of the protective structure 40 on the energy density of the battery device 100 is further reduced.

[0131] In some embodiments, the material of the protective structure 40 is any one of steel, iron, silica gel, or polycarbonate.

[0132] The steel and iron have large hardness, and can provide certain supporting force. The silica gel is soft and wear-resistant, and can improve the anti-deformation capability. The polycarbonate is heat-resistant and impact-resistant, and can improve the stability of the battery monomer 20.

[0133] In the above solutions, the material of the protection structure 40 can be selected according to different requirements, thereby expanding the versatility of the protection structure 40.

[0134] In a second aspect, the embodiments of the present application further provide a power utilization device, which comprises the battery device 100 of any of the above embodiments, and the battery device 100 is used to provide electric energy.

[0135] According to some embodiments of the present application, the present application provides a battery device 100, which comprises a battery monomer 20 and a protection structure 40. The battery monomer 20 comprises a shell 22 and an electrode assembly 23 arranged inside the shell 22. The shell 22 comprises a bottom plate 27 and a side wall 28 arranged around the bottom plate 27. The bottom plate 27 is used to support the electrode assembly 23. The protection structure 40 is used to support the battery monomer 20, and the protection structure 40 at least wraps the corner 29 of the side wall 28. In some embodiments, the bottom plate 27 and the side wall 28 are welded to form a weld protrusion, and the protection structure 40 wraps at least part of the weld protrusion.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell comprising a shell and an electrode assembly arranged inside the shell, the shell comprising a bottom plate and a side wall arranged around the bottom plate, the bottom plate being used to support the electrode assembly; a protection structure used to support the battery cell, and the protection structure at least wrapping a corner of the side wall.

2. The battery device according to claim 1, characterized by The side wall comprises two oppositely arranged first side walls and two oppositely arranged second side walls, the first side walls and the second side walls being connected to each other; the protection structure comprises: a support plate used to support the bottom plate; a protection member connected to the support plate, at least part of the protection member being used to wrap the corner of the side wall and being in contact with the first side wall and the second side wall respectively.

3. The battery device of claim 2, wherein, The number of the protection members is plural, and the plural protection members are arranged at the plural corners of the battery cell respectively, each of the protection members comprising a first protection part and a second protection part connected to each other, the first protection part being in contact with the first side wall, and the second protection part being in contact with the second side wall.

4. The battery device of claim 2, wherein The protection members are arranged in a ring around the side wall in the circumferential direction of the side wall.

5. The battery device of claim 2, wherein At least part of the support plate is in a hollowed-out shape.

6. The battery device of claim 2, wherein The number of the battery cells is plural, and the support plate is used to support the bottom plates of the plural battery cells.

7. The battery device of claim 6, wherein The number of the protection members is plural, and the plural protection members are separated to form plural accommodation grooves, and the plural battery cells are sequentially accommodated in the plural accommodation grooves respectively.

8. The battery device of claim 6, wherein The protection member forms one accommodation groove, and the plural battery cells are accommodated in the one accommodation groove.

9. The battery device of claim 1, wherein, The protection structure comprises plural protection members, and each of the protection members is arranged at the plural corners of the battery cell respectively.

10. The battery device according to any one of claims 1 to 9, wherein The bottom plate and the side wall are welded to form a weld protrusion, and the protection structure wraps at least part of the weld protrusion.

11. The battery device according to any one of claims 1 to 10, wherein A protrusion is arranged on the side of the protection structure away from the shell.

12. The battery device of claim 1, wherein, The thickness of the protection structure is D, and the D satisfies the following condition: 0.05mm≤D≤1mm.

13. The battery device of claim 12, wherein, The D satisfies the following condition: 0.05mm≤D≤0.1mm.

14. The battery device according to any one of claims 1 to 13, wherein The height of the protection structure is H1, and the height of the battery cell is H2, and the H1 and the H2 satisfy the following condition: 0.01%≤H1 / H2≤10%.

15. The battery device of claim 14, wherein, The H1 and the H2 satisfy the following condition: 2%≤H1 / H2≤3%.

16. The battery device according to any one of claims 1 to 13, wherein The material of the protection structure is any one of steel, iron, silica gel or polycarbonate.

17. An electrical device, comprising: The battery device is used to provide electric energy.

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