Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The single battery comprises a shell, an electrode assembly and an insulating part, the shell comprises an end cover and a shell body, the shell body is provided with an opening, and the end cover covers the opening. The electrode assembly is housed within the housing. The insulating part covers the surface of the side, back to the electrode assembly, of the shell and comprises a connecting body and a plurality of particles, the connecting body and the particles are arranged in an insulating mode, and the particles are fixed to the surface of the side, back to the electrode assembly, of the shell through the connecting body. According to the invention, the reliability of the battery monomer can be effectively improved.

Description

TECHNICAL FIELD

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

[0002] With the development of new energy technology, batteries are applied more and more widely, such as in mobile phones, notebook computers, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools.

[0003] In the development of battery technology, the reliability of the battery monomer directly affects the reliability, use cost and user experience of the terminal product. Therefore, how to effectively improve the reliability of the battery monomer is a continuous improvement technical problem in the battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power consumption device, which can effectively improve the reliability of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly and an insulating piece. The shell comprises an end cover and a shell body, and the shell body has an opening, and the end cover covers the opening. The electrode assembly is accommodated in the shell. The insulating piece covers a side surface of the shell body away from the electrode assembly, and the insulating piece comprises a connecting body and a plurality of particles. The connecting body and the particles are both insulatively arranged, and the plurality of particles are fixed to the side surface of the shell body away from the electrode assembly through the connecting body.

[0006] The above technical solution insulates and protects the shell body by arranging a plurality of particles in the insulating piece. On the one hand, the particles can improve the structural strength of the insulating piece as a whole, and reduce the risk of the insulating piece being punctured. On the other hand, the particles can also improve the heat insulation of the insulating piece, and reduce the influence of external temperature changes on the performance of the battery monomer. Thus, the reliability of the battery monomer can be effectively improved.

[0007] In some embodiments of the first aspect, the connecting body is provided in an integral structure and covers the side surface of the shell body away from the electrode assembly. The plurality of particles are embedded in the interior of the connecting body, or the plurality of particles are attached to the side surface of the connecting body away from the shell.

[0008] Embedding the plurality of particles in the interior of the connecting body can reduce the risk of the particles falling off, thereby improving the reliability of the insulating piece as a whole. Attaching the plurality of particles to the side surface of the connecting body away from the shell body can reduce the volume of the connecting body, thereby reducing the consumption of the connecting body material and reducing the overall cost of the battery monomer.

[0009] In some embodiments of the first aspect, the number of connectors is plural, the plural connectors correspond to the plural particles one-to-one, and each connector is coated on the outer surface of each particle. This allows the plural particles to be fixed to the shell through the connectors and also allows the plural particles to be connected and fixed to each other through the connectors, thereby reducing the consumption of connector materials while ensuring the stability of the particles.

[0010] In some embodiments of the first aspect, the particle is of a solid structure. This improves the pressure resistance and structural strength of the particle, thereby further reducing the risk of short circuit of the battery cell due to damage to the insulating member.

[0011] In some embodiments of the first aspect, the particle has a cavity in the interior thereof.

[0012] The cavity can effectively reduce the weight of the particle, thereby reducing the overall weight of the battery cell and improving the energy density of the battery cell. Since the thermal conductivity of air is lower than that of solid materials, the cavity can also improve the heat insulation performance of the particle, thereby further reducing the influence of external temperature changes on the performance of the battery cell. In addition, when the battery cell is impacted, the cavity has a certain buffering capacity to absorb the impact force, thereby improving the impact resistance of the insulating member and reducing the risk of damage to the particle, thereby further improving the reliability of the battery cell.

[0013] In some embodiments of the first aspect, the particle comprises a main body portion and a support portion, the main body portion has a cavity in the interior thereof, and the support portion is arranged in the cavity and connected to the inner surface of the main body portion.

[0014] The above technical solution introduces the support portion, which can support the main body portion when the battery cell is impacted, thereby reducing the deformation of the main body portion under the impact force, thereby further reducing the risk of damage to the particle and further improving the reliability of the battery cell.

[0015] In some embodiments of the first aspect, the wall thickness of the particle is 0.5-4 μm.

[0016] The above technical solution sets the wall thickness of the particle within the above range, which can meet the demand for the insulation and protection effect of the insulating member while reducing the weight of the insulating member, thereby improving the energy density of the battery cell.

[0017] In some embodiments of the first aspect, the wall thickness of the particle is 1-2 μm. This can further improve the insulation and protection effect of the insulating member and reduce the weight of the insulating member.

[0018] In some embodiments of the first aspect, the particle is a sphere.

[0019] By setting the particles as a spherical structure, the uniformity of the distribution of the plurality of particles on the surface of the shell on the side away from the electrode assembly can be improved, which helps to reduce the gap between the plurality of particles, so that the insulating member uniformly insulates the shell in all directions. Under the action of external force, the particles in the spherical structure also help to uniformly disperse the stress, so that the insulating member can better resist mechanical impact and external pressure. In addition, the particles in the spherical structure have no sharp edges, thereby reducing the risk of mutual piercing between the plurality of particles, and further improving the reliability of the insulating member.

[0020] In some embodiments of the first aspect, the diameter of the particle is 5-100 μm.

[0021] The above technical solution can reduce the risk of generating a gap between the plurality of particles by setting the diameter of the particle in the above range, so that the insulating protection effect of the insulating member meets the demand, while reducing the difficulty of preparing the particle.

[0022] In some embodiments of the first aspect, the diameter of the particle is 10-20 μm. The effect of further improving the insulating protection effect of the insulating member and reducing the difficulty of preparation can be taken into account.

[0023] In some embodiments of the first aspect, the material of the particle is one of silicon dioxide, aluminum oxide, magnesium oxide, zirconium oxide or sodium silicate. The insulating protection effect and cost of the particle can be taken into account.

[0024] In the second aspect, the application provides a battery device comprising the battery cell provided by any one of the embodiments of the first aspect.

[0025] In the third aspect, the application provides a power consumption device comprising the battery cell provided by any one of the embodiments of the first aspect or the battery device provided by any one of the embodiments of the second aspect, and the battery cell or the battery device is used for storing or providing electric energy.

[0026] The above description is only a summary of the technical solutions of the application. In order to make the technical means of the application more clear, the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0027] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the application. Moreover, the same reference symbols are used throughout the drawings to represent the same parts. In the drawings:

[0028] Figure 1 The structural schematic diagram of the vehicle provided by some embodiments of the application;

[0029] Figure 2 An exploded structural diagram of a battery device provided by some embodiments of the present application;

[0030] Figure 3 A structural diagram of a battery module provided by some embodiments of the present application;

[0031] Figure 4 An exploded structural diagram of a battery cell provided by some embodiments of the present application;

[0032] Figure 5 A top view structural diagram of a battery cell provided by some embodiments of the present application;

[0033] Figure 6 A structural diagram of Figure 5 A cross-sectional structural diagram along A-A;

[0034] Figure 7 A structural diagram of Figure 6 A partial enlarged structural diagram at H of

[0035] Figure 8 Another partial enlarged structural diagram at H of Figure 6 Yet another partial enlarged structural diagram at H of

[0036] Figure 9 Still another partial enlarged structural diagram at H of Figure 6 Again another partial enlarged structural diagram at H of

[0037] Figure 10 Still another partial enlarged structural diagram at H of Figure 6 Again another partial enlarged structural diagram at H of

[0038] Figure 11 Still another partial enlarged structural diagram at H of Figure 6 Again another partial enlarged structural diagram at H of

[0039] Figure 12 Still another partial enlarged structural diagram at H of Figure 6 Again another partial enlarged structural diagram at H of

[0040] Figure 13 A structural diagram of a particle of a battery cell provided by some embodiments of the present application;

[0041] Figure 14 A structural diagram of Figure 13 A cross-sectional structural diagram along B-B;

[0042] Figure 15 Another cross-sectional structural diagram along B-B; Figure 13

[0043] ​ Figure 16 For Figure 13 Another cross-sectional structure diagram made along B-B.

[0044] Reference signs in the detailed description of the embodiments are as follows:

[0045] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 6, battery module; 7, battery cell;

[0046] 10, housing; 11, end cap; 12, case;

[0047] 20, electrode assembly;

[0048] 30, insulator; 31, connecting body; 32, particle; 321, main body portion; 322, support portion;

[0049] 40, cavity;

[0050] a, wall thickness; b, diameter. DETAILED DESCRIPTION

[0051] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of 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 work fall within the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0053] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection 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 mean the same embodiment, nor is it an independent or alternative embodiment to the other embodiments.

[0054] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "attach" should be broadly interpreted, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. 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.

[0055] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0056] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0057] "Multiple" appearing in the present application means more than two (including two).

[0058] The term "parallel" in the present application not only includes the case of absolute parallel, but also includes the case of approximate parallel which is generally recognized in engineering; at the same time, "vertical" also not only includes the case of absolute vertical, but also includes the case of approximate vertical which is generally recognized in engineering.

[0059] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0060] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc. The embodiments of the present application are not limited thereto.

[0061] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode.

[0062] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0063] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either or both of the two surfaces of the positive electrode current collector.

[0064] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0065] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0066] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either or both of the two surfaces of the negative electrode current collector.

[0067] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0068] The electrode assembly can be in a jelly-roll structure, a stack structure, or a hybrid structure of the jelly-roll and stack structures.

[0069] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0070] In some embodiments, the electrode assembly is in a stack structure.

[0071] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0072] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments stacked one on another, with one positive electrode sheet sandwiched between adjacent folded segments.

[0073] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments stacked one on another.

[0074] As an example, a plurality of separators can be provided, each disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0075] As an example, the separators can be provided continuously and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0076] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0077] In some embodiments, the electrode assembly is provided with tabs, which can guide current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0078] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., copper-aluminum composite housing), an aluminum-plastic film, or the like. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating film or an aluminum-plastic film. When the housing is a sealed structure, the housing is used to encapsulate the electrode assembly, the electrolyte, and the like.

[0079] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square-shaped battery cell, a blade-shaped battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), or the like.

[0080] In some embodiments, the housing includes an end cap and a housing body, and the housing body is provided with an opening, and the end cap is provided on the opening. The housing body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0081] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the housing body.

[0082] The battery apparatus 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 current collecting member.

[0083] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0084] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a separate module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0085] In some embodiments, the battery apparatus can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body.

[0086] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0087] As an example, the battery cell assembly can also be accommodated in the case by fixing a plurality of battery cells directly in the case.

[0088] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, respectively, so that an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0089] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0090] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0091] With the development of new energy technology, batteries are increasingly widely used, such as in mobile phones, notebook computers, electric vehicles, electric cars, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft, and electric tools. In the development of battery technology, the reliability of the battery cell directly affects the reliability, use cost, and user experience of the terminal product.

[0092] In the related art, the shell of the battery cell has a large hardness, the corners are relatively sharp, and the end cover part has a boss. Since the insulating piece has a film layer structure and is relatively soft, the insulating piece on the outer surface of the shell is easily pierced, which seriously affects the reliability of the battery cell. For example, during the insulation test of the battery cell, the insulating piece is easily pierced after the battery cell is pressurized. When multiple battery cells are placed and bound together in a battery device, the insulating piece is easily pierced. During the daily use of the battery cell, as the use time of the battery cell increases, the battery cell expands, the extrusion force between adjacent battery cells increases, and the risk of the insulating piece being pierced also increases.

[0093] Based on the above considerations, the embodiments of the present application provide a battery cell. The battery cell includes a shell, an electrode assembly, and an insulating piece. The shell includes an end cover and a housing. The housing has an opening, and the end cover covers the opening. The electrode assembly is accommodated in the shell. The insulating piece covers a side surface of the housing away from the electrode assembly. The insulating piece includes a connecting body and a plurality of particles. The connecting body and the particles are both insulating. The plurality of particles are fixed to the side surface of the housing away from the electrode assembly by the connecting body.

[0094] The technical solution has the advantages that the plurality of particles are arranged in the insulating member to insulate and protect the shell. On one hand, the particles can improve the structural strength of the insulating member as a whole, and reduce the risk of the insulating member being punctured. On the other hand, the particles can also improve the heat insulation of the insulating member, and reduce the influence of temperature changes in the outside world on the performance of the battery monomer. Thus, the reliability of the battery monomer can be effectively improved.

[0095] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application.

[0096] With reference to Figure 1 , the inside of the vehicle 1 is provided with a battery device 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as an operating power source of the vehicle 1.

[0097] The vehicle 1 can also include a controller 3 and a motor 4, the controller 3 being used to control the battery device 2 to supply power to the motor 4, for example, for the power demand of the vehicle 1 during starting, navigation and driving.

[0098] In some embodiments of the present application, the battery device 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0099] Figure 2 An explosion structural schematic diagram of a battery device is provided for some embodiments of the present application.

[0100] With reference to Figure 2 , the battery device 2 includes a box body 5 and battery monomers, and the battery monomers are contained in the box body 5.

[0101] The box body 5 is used to contain the battery monomers, and the box body 5 can have various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b are mutually covered, and the first box body part 5a and the second box body part 5b jointly define a containing space 5c for containing the battery monomers. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a is a plate-shaped structure, which is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c; or the first box body part 5a and the second box body part 5b can both be hollow structures with one side open, and the open side of the first box body part 5a is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c. Of course, the first box body part 5a and the second box body part 5b can have various shapes, such as a cylinder, a cuboid, etc.

[0102] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0103] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0104] In the battery device 2, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit can be housed within the housing 5. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 6, and then the multiple battery modules 6 can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 5.

[0105] Figure 3 A schematic structural diagram of a battery module provided in some embodiments of the present application.

[0106] In some embodiments, continue to refer to Figure 3 There are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed series to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box.

[0107] The multiple battery cells 7 in the battery module 6 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0108] The battery cells provided in the embodiments of the present application are introduced below with reference to the accompanying drawings. Figure 4 This is a schematic diagram of the explosion structure of a battery cell provided in some embodiments of the present application. Figure 5 This is a schematic diagram of a top view of a battery cell provided in some embodiments of the present application. Figure 6 for Figure 5 Schematic diagram of the cross-section structure along AA, Figure 7 for Figure 6 A schematic diagram of a local enlarged structure is made at H.

[0109] Continue to refer Figures 4 to 6The battery cell 7 comprises a shell 10, an electrode assembly 20 and an insulating member 30. The shell 10 comprises a cover 11 and a casing 12. The casing 12 has an opening, and the cover 11 covers the opening. The electrode assembly 20 is accommodated in the shell 10. The insulating member 30 covers a side surface of the casing 12 away from the electrode assembly 20. The insulating member 30 comprises a connecting body 31 and a plurality of particles 32. The connecting body 31 and the particles 32 are both insulated. The plurality of particles 32 are fixed to the side surface of the casing 12 away from the electrode assembly 20 through the connecting body 31.

[0110] The shell 10 is a component for forming an internal environment of the battery cell 7. The internal environment can be used to accommodate the electrode assembly 20, electrolyte and other components. The shell 10 can be made of metal or non-metal material, for example, the metal material can be copper, aluminum or stainless steel, and the non-metal material can be polyethylene, polypropylene or polyvinyl chloride.

[0111] The casing 12 and the cover 11 can be independent components. The casing 12 can have an opening, and the cover 11 covers the opening to form the internal environment of the battery cell 7. Alternatively, the cover 11 and the casing 12 can be integrated. Specifically, the cover 11 and the casing 12 can form a common connecting surface before other components enter the casing. When it is necessary to seal the internal environment of the casing 12, the cover 11 covers the casing 12. The casing 12 can have various shapes and sizes, for example, a cuboid, a cylinder or a hexagonal prism. Specifically, the shape of the casing 12 can be determined according to the specific shape and size of the electrode assembly 20. The material of the casing 12 can be various, for example, the casing 12 can be made of metal or non-metal material, for example, the metal material can be copper, aluminum or stainless steel, and the non-metal material can be polyethylene, polypropylene or polyvinyl chloride.

[0112] The cover 11 is a component that covers the opening of the casing 12 to isolate the internal environment of the battery cell 7 from the external environment. Alternatively, the shape of the cover 11 can be adapted to the shape of the casing 12 to fit the casing 12. Alternatively, the cover 11 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the cover 11 is not easy to deform when subjected to extrusion and collision, so that the battery cell 7 can have higher structural strength, and the reliability can also be improved. Functional components such as a terminal group can be provided on the cover 11. The material of the cover 11 can be various, for example, the cover 11 can be made of metal or non-metal material, for example, the metal material can be copper, aluminum or stainless steel, and the non-metal material can be polyethylene, polypropylene or polyvinyl chloride.

[0113] Optionally, the end cover 11 can be detachably connected to the case 12 or integrally provided on the case 12. The end cover 11 can be directly connected to the case 12 or limited on the case 12 by other components. As an example, the connection mode of the end cover 11 and the case 12 can be, but is not limited to, welding, riveting or bonding, etc.

[0114] The electrode assembly 20 is a component in which an electrochemical reaction occurs in the battery cell 7. In the embodiment of the present application, the electrode assembly 20 is of a stacked structure, which is mainly formed by stacking positive and negative electrode sheets in a first direction, and a separator is generally provided between the positive and negative electrode sheets. The positive and negative electrode sheets have portions with active materials, which constitute a main body portion 321 of the electrode assembly 20, and portions without active materials, which each constitute a tab. The positive and negative tabs can be located together at one end of the main body portion 321 or at two ends thereof, respectively. In the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0115] The insulating member 30 covers a side surface of the case 12 facing away from the electrode assembly 20 for insulating and protecting the outer surface of the case 12. The connecting body 31 mainly serves a connecting function for fixing a plurality of particles 32 to the side surface of the case 12 facing away from the electrode assembly 20. The particles 32 are main functional components of the insulating member 30 for insulating the case 12 from the external environment.

[0116] In some examples, the plurality of particles 32 covers the side surface of the case 12 facing away from the electrode assembly 20.

[0117] The number, shape and material of the particles 32 can be adjusted according to actual needs. As an example, the number of the particles 32 can be selected according to the area of the side surface of the case 12 facing away from the electrode assembly 20, as long as the side surface of the case 12 facing away from the electrode assembly 20 can be covered and insulated.

[0118] In some examples, the shape of the particles 32 can be a sphere, a cube or a polyhedron, etc.

[0119] In some examples, the material of the particles 32 is at least one of silicon dioxide, aluminum oxide, magnesium oxide, zirconium oxide or sodium silicate. In other words, the material of the particles 32 is one of silicon dioxide, aluminum oxide, magnesium oxide, zirconium oxide or sodium silicate, or a combination of multiple of silicon dioxide, aluminum oxide, magnesium oxide, zirconium oxide or sodium silicate.

[0120] In some examples, the connecting body 31 can be, but is not limited to, polyvinylidene fluoride, polyurethane, polyimide, acrylate, polyolefin or epoxy resin, etc.

[0121] The technical solution can improve the structural strength of the insulation piece 30 as a whole, reduce the risk of the insulation piece 30 being punctured, improve the heat insulation of the insulation piece 30, and reduce the influence of external temperature changes on the performance of the battery monomer 7, thereby effectively improving the reliability of the battery monomer 7.

[0122] Figure 8 For Figure 6 Another partial enlarged structure schematic view made at H of Figure 9 For Figure 6 Yet another partial enlarged structure schematic view made at H of Figure 10 For Figure 6 Still another partial enlarged structure schematic view made at H of

[0123] With reference to Figures 8 to 10 In some embodiments, the connecting body 31 is provided in an integrated structure and covers the side surface of the shell 12 away from the electrode assembly 20, and the plurality of particles 32 are embedded in the interior of the connecting body 31.

[0124] The connecting body 31 in an integrated structure means that the connecting body 31 has a fixed structure form before the plurality of particles 32 and the connecting body 31 are assembled.

[0125] Exemplarily, the plurality of particles 32 can be embedded in the interior of the connecting body 31 to form the insulation piece 30, and then the insulation piece 30 is covered on the side surface of the shell 12 away from the electrode assembly 20; or the connecting body 31 can be covered on the side surface of the shell 12 away from the electrode assembly 20, and then the plurality of particles 32 are embedded in the interior of the connecting body 31 to form the insulation piece 30.

[0126] The plurality of particles 32 embedded in the interior of the connecting body 31 can reduce the risk of the particles 32 falling off, thereby improving the reliability of the insulation piece 30 as a whole.

[0127] In some embodiments, the plurality of particles 32 are regularly arranged in the interior of the connecting body 31, for example, the plurality of particles 32 are arranged in an array.

[0128] In some embodiments, the plurality of particles 32 are randomly distributed in the interior of the connecting body 31.

[0129] In some embodiments, the plurality of particles 32 are arranged in a single layer in the interior of the connecting body 31.

[0130] In some embodiments, the plurality of particles 32 are arranged in multiple layers in the interior of the connecting body 31, and the multiple layers can be two or more layers.

[0131] Figure 11 is made at H of FIG. 10. Figure 6 is made at H of FIG. 10.

[0132] With reference to the foregoing description, Figure 11 In some embodiments, the connecting body 31 is provided in an integral structure and covers a side surface of the shell 12 away from the electrode assembly 20, and the plurality of particles 32 are attached to the side surface of the connecting body 31 away from the shell 12.

[0133] Exemplarily, the plurality of particles 32 can be attached to the side surface of the connecting body 31 away from the shell 12 to form the insulating piece 30, and then the insulating piece 30 is covered on the side surface of the shell 12 away from the electrode assembly 20; or the connecting body 31 can be covered on the side surface of the shell 12 away from the electrode assembly 20, and then the plurality of particles 32 are attached to the side surface of the connecting body 31 away from the shell 12 to form the insulating piece 30.

[0134] The plurality of particles 32 attached to the side surface of the connecting body 31 away from the shell 12 can reduce the volume of the connecting body 31, thereby reducing the consumption of the material of the connecting body 31 and lowering the overall cost of the battery monomer 7.

[0135] In some embodiments, the connecting body 31 can be provided on the side surface of the shell 12 away from the electrode assembly 20 by coating.

[0136] In some embodiments, the connecting body 31 can be provided on the side surface of the shell 12 away from the electrode assembly 20 by pouring.

[0137] In some embodiments, the connecting body 31 can be provided on the side surface of the shell 12 away from the electrode assembly 20 by adhering.

[0138] Figure 12 is made at H of FIG. 10. Figure 6 is made at H of FIG. 10.

[0139] With reference to the foregoing description, Figure 12 In some embodiments, the number of the connecting bodies 31 is multiple, the plurality of connecting bodies 31 correspond to the plurality of particles 32 one by one, and each connecting body 31 covers the outer surface of each particle 32.

[0140] The number of the connecting bodies 31 matches the number of the particles 32. Exemplarily, the connecting body 31 is covered on the outer surface of the particle 32, and then the particle 32 covered with the connecting body 31 is provided on the shell 12 and covers the side surface of the shell 12 away from the electrode assembly 20.

[0141] In some examples, the particles 32 coated with the connecting bodies 31 can be arranged on the side surface of the shell 12 away from the electrode assembly 20 by spraying.

[0142] The outer surface of the particle 32 is provided with the connecting body 31, so that the plurality of particles 32 can be fixed on the shell 12 through the connecting body 31, and the plurality of particles 32 can be connected and fixed to each other through the connecting body 31, which can reduce the consumption of the connecting body 31 material while considering the stability of the particle 32.

[0143] In some embodiments, the particle 32 is a solid structure. The pressure resistance and structural strength of the particle 32 can be improved to further reduce the risk of short circuit of the battery monomer 7 due to damage of the insulating part 30.

[0144] Figure 13 A structural schematic diagram of a particle of a battery monomer provided by some embodiments of the present application,

[0145] Figure 14 For Figure 13 A sectional structure schematic diagram made along B-B.

[0146] Continuing to refer to Figures 13 and 14 In some embodiments, the particle 32 is internally provided with a cavity 40. In other words, the particle 32 is a hollow structure.

[0147] The arrangement of the cavity 40 can effectively reduce the weight of the particle 32, which helps to reduce the overall weight of the battery monomer 7 and improve the energy density of the battery monomer 7. Since the thermal conductivity of air is lower than that of solid materials, the cavity 40 can also improve the heat insulation performance of the particle 32, which can further reduce the influence of external temperature changes on the performance of the battery monomer 7. In addition, when the battery monomer 7 is impacted, the cavity 40 has a certain buffering capacity to absorb the impact force, enhances the impact resistance of the insulating part 30, reduces the risk of damage to the particle 32, and further improves the reliability of the battery monomer 7.

[0148] In some embodiments, the cavity 40 is filled with a material with low thermal conductivity, such as aerogel or foamed polystyrene, to further improve the heat insulation performance of the insulating part 30.

[0149] In some embodiments, the cavity 40 is filled with an inert gas, such as nitrogen or argon, to improve the oxidation resistance of the insulating part 30.

[0150] Figure 15 For Figure 13 Another sectional structure schematic diagram made along B-B, Figure 16 For Figure 13 Still another sectional structure schematic diagram made along B-B.

[0151] Continue to refer Figures 15 and 16 In some embodiments, the particle 32 includes a main body 321 and a support portion 322 . A cavity 40 is defined inside the main body 321 . The support portion 322 is disposed in the cavity 40 and connected to the inner surface of the main body 321 .

[0152] For example, the support portion 322 may be directly connected to the inner surface of the main body 321, or may be restricted on the inner surface of the main body 321 by other components. The support portion 322 may be, but is not limited to, a columnar structure, a block structure, or a plate structure.

[0153] In some examples, the support portion 322 is a columnar structure, one end of the support portion 322 along its own extension direction is connected to the inner surface of the main body 321 , and the other end is spaced apart from the inner surface of the main body 321 .

[0154] In some examples, the support portion 322 is a columnar structure, and both ends of the support portion 322 along its own extension direction are connected to the inner surface of the main body 321 .

[0155] The number of the supporting portion 322 can be one or more. As an example, when the number of the supporting portion 322 is plural, the plurality of supporting portions 322 are arranged at intervals.

[0156] The above technical solution introduces the support portion 322. When the battery cell 7 is impacted, the support portion 322 can support the main body 321 to reduce the deformation of the main body 321 under the impact force, thereby further reducing the risk of damage to the particles 32, thereby further improving the reliability of the battery cell 7.

[0157] In some embodiments, the main body portion 321 and the support portion 322 are an integrally formed structure.

[0158] On the one hand, there is no need to use an additional connection process to connect the main body 321 and the support portion 322, which simplifies the manufacturing process. At the same time, compared with connecting the main body 321 and the support portion 322 through an additional connection process, the main body 321 and the support portion 322 in an integrated structure have higher stability.

[0159] In some embodiments, the wall thickness a of the particles 32 is 0.5 μm to 4 μm.

[0160] Exemplarily, the wall thickness a of the particle 32 refers to the distance between the outer surface and the inner surface of the particle 32 having the cavity 40 .

[0161] As an example, the wall thickness a of the particle 32 may be, but is not limited to, 0.5 μm, 0.8 μm, 1 μm, 1.5 μm, 1.8 μm, 2 μm, 2.5 μm, 2.8 μm, 3 μm, 3.5 μm, or 4 μm.

[0162] It is understood that the greater the wall thickness a of the particle 32, the higher the structural strength of the particle 32, and the greater the weight of the particle 32. The smaller the wall thickness a of the particle 32, the lower the structural strength of the particle 32, and the smaller the weight of the particle 32.

[0163] The above technical solution sets the wall thickness a of the particles 32 within the above range, thereby ensuring that the insulation protection effect of the insulating member 30 meets the requirements while reducing the weight of the insulating member 30 to improve the energy density of the battery cell 7.

[0164] In some embodiments, the wall thickness a of the particles 32 is 1 μm-2 μm, which can further improve the insulation protection effect of the insulating member 30 and reduce the weight.

[0165] As an example, the wall thickness a of the particle 32 may be, but is not limited to, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, or 2 μm.

[0166] In some embodiments, particles 32 are spheres.

[0167] By configuring the particles 32 as spherical structures, the uniformity of the distribution of the particles 32 on the side of the housing 12 facing away from the electrode assembly 20 can be improved, helping to reduce the gaps between the particles 32, thereby enabling the insulating member 30 to provide uniform insulation protection for the housing 12 in all directions. Under external forces, the spherical particles 32 also help to evenly distribute stress, enabling the insulating member 30 to better withstand mechanical shock and external pressure. Furthermore, the spherical particles 32 lack sharp edges, reducing the risk of puncture between the particles 32 and further improving the reliability of the insulating member 30.

[0168] In some embodiments, the diameter b of the particles 32 is 5 μm-100 μm.

[0169] For example, the diameter b of a particle 32 refers to the length of a line segment passing through the center of the spherical particle 32 and connecting any two points on the spherical surface. It should be noted that in embodiments where a cavity 40 is defined within the particle 32 and both the outer and inner surfaces of the particle 32 are spherical, the diameter b of the particle 32 refers to the length of a line segment passing through the center of the spherical particle 32 and connecting any two points on the outer surface, which may also be referred to as the outer diameter of the particle 32.

[0170] For example, the diameter b of the particle 32 can be, but is not limited to, 5 μm, 8 μm, 10 μm,

[0171] 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm.

[0172] It can be understood that the larger the diameter b of the particle 32, the lower the difficulty in preparing the particle 32, and the greater the risk of gaps between the plurality of particles 32. The smaller the diameter b of the particle 32, the higher the difficulty in preparing the particle 32, and the smaller the risk of gaps between the plurality of particles 32.

[0173] The technical solution can reduce the risk of gaps between the plurality of particles 32, so as to reduce the difficulty in preparing the particle 32 while meeting the demand for the insulation protection effect of the insulating member 30.

[0174] In some embodiments, the diameter b of the particle 32 is 10 μm-20 μm. The insulation protection effect of the insulating member 30 and the difficulty in preparation can be further improved.

[0175] For example, the diameter b of the particle 32 can be, but is not limited to, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm.

[0176] In some embodiments, the material of the particle 32 is one of silicon dioxide, aluminum oxide, magnesium oxide, zirconium oxide, or sodium silicate. These materials have good strength and low cost, and can balance the insulation protection effect and cost of the particle 32.

[0177] In some embodiments, the particle 32 is an elastomer. The particle 32 is made of an elastic material, and the elastic particle 32 can play a buffering role to reduce the impact force on the battery monomer 7 when the battery monomer 7 is subjected to external impact, reduce the risk of damage to the battery monomer 7, and improve the reliability of the battery monomer 7.

[0178] In some embodiments, the material of the particle 32 can be insulating rubber or insulating plastic.

[0179] In some embodiments, the particle 32 is a glass bead, which has a simple structure and low cost.

[0180] In some embodiments, the insulating member 30 also covers at least a portion of the end cover 11 to further improve the reliability of the battery monomer 7 as a whole. For example, the insulating member 30 can cover the circumferential side of the end cover 11, and the insulating member 30 can also cover the area on the side surface of the end cover 11 away from the electrode assembly 20 where no other components are arranged. The other components include, but are not limited to, electrode terminals, liquid injection holes, and pressure relief mechanisms.

[0181] According to some embodiments of the present application, the present application also provides a battery device comprising the battery monomer 7 of any of the above solutions.

[0182] According to some embodiments of the present application, the present application also provides a power consuming device comprising the battery monomer 7 or the battery device of any of the above solutions, which is used to store or provide electric energy.

[0183] If not specifically stated, all embodiments and optional embodiments of the present application can be combined to form new technical solutions. All technical features and optional technical features of the present application can be combined to form new technical solutions.

[0184] In order to better understand the battery monomer 7 provided by the embodiments of the present application, based on the same inventive concept, the above-mentioned battery monomer 7 in practical application is described.

[0185] The embodiments of the present application provide a battery monomer 7, which comprises a shell 10, an electrode assembly 20, and an insulating member 30. The shell 10 comprises an end cover 11 and a shell body 12, and the shell body 12 has an opening, and the end cover 11 covers the opening. The electrode assembly 20 is contained in the shell 10. The insulating member 30 covers a side surface of the shell body 12 away from the electrode assembly 20, and the insulating member 30 comprises a connecting body 31 and a plurality of particles 32. The connecting body 31 and the particles 32 are both insulatingly arranged, and the plurality of particles 32 are fixed to the side surface of the shell body 12 away from the electrode assembly 20 through the connecting body 31. The inside of the particle 32 is provided with a cavity 40, the wall thickness a of the particle 32 is 1 μm-2 μm, and the diameter b of the particle 32 is 10 μm-20 μm.

[0186] The above technical solution insulates and protects the shell body 12 by arranging a plurality of particles 32 in the insulating member 30. On the one hand, the particles 32 can improve the structural strength of the insulating member 30 and reduce the risk of the insulating member 30 being punctured. On the other hand, the particles 32 can also improve the heat insulation of the insulating member 30 and reduce the influence of external temperature changes on the performance of the battery monomer 7. Thus, the reliability of the battery monomer 7 can be effectively improved.

[0187] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises an end cover and a shell, wherein the shell has an opening and the end cover covers the opening; an electrode assembly housed in the housing; An insulating member covers the surface of the shell on the side facing away from the electrode assembly. The insulating member includes a connector and a plurality of particles. The connector and the particles are both insulated. The plurality of particles are fixed to the surface of the shell on the side facing away from the electrode assembly through the connector.

2. The battery cell according to claim 1, wherein: The connector is an integrated structure and covers a surface of the housing facing away from the electrode assembly. A plurality of the particles are embedded in the interior of the connector, or a plurality of the particles are attached to a surface of the connector facing away from the shell.

3. The battery cell according to claim 1, wherein: There are multiple connectors, each of which corresponds to each of the particles. Each connector is coated on the outer surface of each of the particles.

4. The battery cell according to claim 1, wherein: The particles are solid structures.

5. The battery cell according to claim 1, characterized in that A cavity is formed inside the particle.

6. The battery cell according to claim 5, characterized in that The particle includes a main body and a supporting part. The cavity is opened inside the main body. The supporting part is arranged in the cavity and connected to the inner surface of the main body.

7. The battery cell according to claim 5, characterized in that The wall thickness of the particles is 0.5 μm to 4 μm.

8. The battery cell according to claim 7, characterized in that The wall thickness of the particles is 1 μm-2 μm.

9. The battery cell according to claim 1, characterized in that The particles are spheres.

10. The battery cell according to claim 9, characterized in that The diameter of the particles is 5 μm-100 μm.

11. The battery cell according to claim 10, characterized in that The diameter of the particles is 10 μm-20 μm.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The material of the particles is one of silicon dioxide, aluminum oxide, magnesium oxide, zirconium oxide or sodium silicate.

13. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The battery cell according to any one of claims 1 to 12 or the battery device according to claim 13 is used to store or provide electrical energy.

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