Battery shell structure, secondary battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery shell structure, a secondary battery and electric equipment. The battery shell structure comprises an upper cover plate, a lower cover plate, an upper cover plate and a lower cover plate, and a first through hole is formed in the upper cover plate; the first through hole penetrates through the upper cover plate; a mounting hole is also formed in the upper cover plate; the lower shell is connected to the upper cover plate; an inner convex part is arranged in the lower shell; a placing cavity is formed between the inner wall of the lower shell and the upper cover plate and between the inner convex part and the upper cover plate; a second through hole is formed in the inner convex part; the second through hole penetrates through the inner convex part; and the second through hole is communicated with the first through hole. According to the utility model, the overall weight can be reduced, and the adaptability between the shell and the naked battery core is improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a battery casing structure, a secondary battery, and an electrical device. Background Technology

[0002] As we all know, rechargeable batteries are called secondary batteries, also known as rechargeable batteries. Common types of secondary batteries we encounter in our daily lives include lead-acid batteries, nickel-cadmium / nickel-metal hydride batteries, and lithium-ion batteries. They have become indispensable consumer products in modern life. However, for ring-shaped wearable devices such as smart rings or smart bracelets, it would be difficult to arrange square or cylindrical batteries.

[0003] However, existing battery designs for ring-shaped electrical devices primarily utilize pouch-type curved lithium-ion batteries. However, during the manufacturing process, it is difficult to use external force to extrude and shape the cells into a small-radius arc to fit the corresponding battery casing. Furthermore, this results in low dimensional utilization of the battery casing, and excessive compression deformation during cell assembly can reduce safety and stability during use. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a battery casing structure, a secondary battery, and an electrical device that can solve the technical problem of poor compatibility between the battery cell and the casing in the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery casing structure, comprising:

[0007] The upper cover plate has a first through hole inside it; the first through hole penetrates the upper cover plate; the upper cover plate also has mounting holes inside it.

[0008] The lower housing is connected to the upper cover plate; and the lower housing has an inner protrusion; a placement cavity is provided between the inner wall of the lower housing, the inner protrusion and the upper cover plate; the inner protrusion has a second through hole; the second through hole passes through the inner protrusion; and the second through hole communicates with the first through hole.

[0009] Preferably, the relationship between the height h1 of the inner wall of the lower housing and the height h2 of the inner protrusion satisfies: h1 = h2;

[0010] Furthermore, the top of the inner protrusion is connected to the bottom of the upper cover plate.

[0011] Preferably, the mounting hole contains an electrode post; the mounting hole includes a stepped portion and a third through hole arranged sequentially from the inside to the outside; the electrode post includes an extension portion and a main body portion connected to each other; the main body portion passes through the third through hole; the extension portion is disposed within the stepped portion;

[0012] The relationship between the width d1 of the main body and the width d2 of the extension portion satisfies: d1 < d2; and / or the relationship between the width d2 of the extension portion, the width L1 of the upper cover plate (excluding the first through hole 101), and the thickness L2 of the inner wall of the lower shell satisfies: d2 < L1 - 2 * L2.

[0013] Preferably, the inner convex portion has a first inclined surface on the wall surface facing the placement cavity;

[0014] And / or, the inner wall of the lower housing is provided with a second inclined surface.

[0015] Preferably, the angle formed by the first inclined plane and the horizontal plane it lies on is β; β satisfies: 88°≤β≤90°;

[0016] And / or, the angle formed by the second inclined plane and the horizontal plane it lies in is α; α satisfies: 88°≤α≤90°.

[0017] Preferably, the upper cover plate is further provided with a housing insulation component; the housing insulation component is disposed between the inner wall of the mounting hole and the pole post; and the bottom of the housing insulation component extends into the placement cavity.

[0018] This utility model also discloses a secondary battery, including a cell body and the battery casing structure described above; the cell body includes an inner support, a separator, and a first electrode and a second electrode with opposite polarities; the first electrode, the separator, and the second electrode are stacked in sequence and wound to form a wound body; the inner wall of the wound body is connected to the outer wall of the inner support; and the inner wall of the inner support is connected to the inner wall surface of the inner protrusion facing the placement cavity.

[0019] Preferably, the relationship between the width L4 of the inner support and the inner protrusion L5 satisfies: L4 = L5 + (3μm ~ 6μm);

[0020] And / or, the relationship between the height h3 of the inner support and the height h2 of the inner protrusion satisfies: h3≤h2;

[0021] And / or, the relationship between the width L1 of the upper cover plate (excluding the first through hole), the width L3 of the placement cavity, and the difference L4 between the inner and outer diameters of the winding body satisfies: L1≥L3≥L4.

[0022] Preferably, a cell insulator is provided between the winding body and the upper cover plate and / or between the winding body and the lower housing; and the cell insulator is connected to the winding body.

[0023] This utility model also discloses an electrical device, including the aforementioned secondary battery.

[0024] The beneficial effects of this utility model are as follows: By using the connection between the first through hole and the second through hole, the hollow annular upper cover plate and the hollow annular lower shell are matched, which effectively reduces the overall weight of the battery shell structure, ensures uniform weight distribution of the wound bare cells, and improves the compatibility between the shell and the bare cells; by fitting the bare cells between the inner protrusion and the inner wall of the lower shell, the assembly of the wound bare cells can be facilitated, and the space utilization of the battery shell structure can be improved; it can also reduce the deformation of the bare cells due to excessive external force, and improve the stability and safety of use. Attached Figure Description

[0025] The following will refer to the appendix. Figures 1-7 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0026] Figure 1 This is a schematic diagram of the battery casing structure according to an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional view of a battery casing structure according to an embodiment of the present invention;

[0028] Figure 3 This is a partially enlarged cross-sectional view of a battery casing structure according to an embodiment of the present invention;

[0029] Figure 4 This is a partially enlarged cross-sectional view of a battery casing structure according to an embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional view of a secondary battery according to an embodiment of the present invention;

[0031] Figure 6 This is a partially enlarged cross-sectional view of a secondary battery according to an embodiment of the present invention.

[0032] Figure 7 This is a partially enlarged cross-sectional view of a secondary battery according to an embodiment of the present invention.

[0033] In the figure: 1-Upper cover plate; 101-First through hole; 102-Mounting hole; 11-Electrode post; 112-Outer extension; 111-Main body; 12-Shell insulation component; 121-First connecting section; 122-Second connecting section; 2-Lower shell; 21-Inner protrusion; 211-First inclined surface; 201-Placement cavity; 202-Second through hole; 203-Second inclined surface; 3-Cell body; 31-Separating membrane; 32-First electrode; 33-Second electrode; 301-First tab; 302-Second tab; 304-Cell insulation component; 4-Inner support body. Detailed Implementation

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] The following is in conjunction with the appendix Figures 1 to 7 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0040] like Figure 1 As shown, in one embodiment of this utility model, the battery casing structure includes:

[0041] The upper cover plate 1 has a first through hole 101 inside it; the first through hole 101 is arranged through the thickness direction of the upper cover plate 1.

[0042] The lower housing 2 is connected to the upper cover plate 1; and the lower housing 2 has an inner protrusion 21; a placement cavity 201 is provided between the inner wall of the lower housing 2, the inner protrusion 21 and the upper cover plate 1; the placement cavity 201 is used to place bare battery cells; a second through hole 202 is provided in the inner protrusion 21; the second through hole 202 is arranged through the thickness direction of the inner protrusion 21; and the second through hole 202 communicates with the first through hole 101.

[0043] The technical solution of this utility model effectively reduces the overall weight of the battery casing structure and ensures uniform weight distribution of the wound bare cells by using a combination of an internally hollow annular upper cover plate and an internally hollow annular lower shell, thereby improving the compatibility between the casing and the bare cells. Furthermore, by fitting the bare cells between the inner protrusion and the inner wall of the lower shell, it ensures convenient assembly of the wound bare cells and improves the space utilization of the battery casing structure. It also reduces excessive external force on the bare cells, thus reducing deformation and improving the stability and safety of use.

[0044] Specifically, in some implementations, such as Figure 1 and 2As shown, the relationship between the height h1 of the inner wall of the lower housing 2 and the height h2 of the inner protrusion 21 satisfies: h1 = h2; and the top of the inner protrusion 21 is connected to the bottom of the upper cover plate 1. That is to say, the inner wall of the lower housing 2, the bottom of the upper cover plate 1, and the protrusion 21 form an annular and sealed placement cavity 201, thereby improving the space utilization of the battery housing structure; ensuring the ease of assembly of the wound bare cells; and reducing excessive external force on the bare cells to prevent deformation, thus improving the stability and safety of use.

[0045] Specifically, in some implementations, such as Figure 1 and 2 As shown in Figure 3, the upper cover plate 1 is also provided with a mounting hole 102; the mounting hole 102 is provided with a pole post 11; the mounting hole 102 includes a stepped portion and a third through hole (not shown in the figure) arranged sequentially from the inside to the outside; the pole post 11 includes an extension portion 112 and a main body portion 111 connected to each other; the bottom of the main body portion 111 extends to the placement cavity 201; the top of the extension portion 112 extends to the outside of the upper cover plate 1; the relationship between the width (diameter) d1 of the main body portion 111 and the width (diameter) d2 of the extension portion 112 satisfies: d1 < d2; and the relationship between the width (diameter) d2 of the extension portion 112, the width L1 of the upper cover plate 1 at a location other than the first through hole 101, and the width L2 of the inner wall of the lower housing 2 satisfies: d2 < L1 - 2 * L2. In other words, the pole post 11 is a cylindrical shape with steps; and by properly matching the width of the main body 111, the width of the extension 112, the width of the non-first through hole 101 in the upper cover plate 1, and the width of the inner wall of the lower housing 2, the stability of the overall structure can be ensured, and the installation performance and conductivity of the pole post 11 can be guaranteed.

[0046] Specifically, in some implementations, such as Figure 1 and 2 As shown, the upper cover plate 1 also includes a housing insulation component 12; the housing insulation component 12 is disposed between the inner wall of the mounting hole 102 and the pole post 11; and the bottom of the housing insulation component 12 extends into the placement cavity 201. The housing insulation component 12 is made of housing insulating adhesive paper, which includes a base tape and pressure-sensitive adhesive layers connected to both sides of the base tape; the base tape is made of cotton cloth, synthetic fiber fabric, or plastic film. Further, polyvinyl chloride electrical insulating tape is selected.

[0047] Specifically, in some implementations, such as Figure 2 and 3As shown, the housing insulation component 12 includes a first connecting section 121 and a second connecting section 122 connected to each other; the first connecting section 121 is connected between the inner wall of the mounting hole 102 and the electrode post 11; the second connecting section 122 is connected between the bottom of the upper cover plate 1 and the placement cavity 201. That is, by using the first connecting section 121, which provides sealing and insulation between the positive electrode post and the mounting hole 102 in the upper cover plate, and the second connecting section 122, which provides insulation on the bottom surface of the upper cover plate, insulation is achieved between the upper cover plate 1 and the electrode post 11, as well as between the upper cover plate 1 and the bare battery cell, thereby preventing leakage, short circuits, and other failures; and improving the safety and stability of use.

[0048] Specifically, in some implementations, such as Figure 1 and 4 As shown, the inner protrusion 21 has a first inclined surface 211 on the wall surface facing the placement cavity 201; and the angle formed by the first inclined surface 211 and the horizontal plane it is located is β; β satisfies: 88°≤β≤90°. Wherein, β can be 88°, 88.5°, 88.6°, 89°, 89.5°, 89.6°, and 90°, etc. Preferably, it is 90°. That is to say, the inner protrusion 21 forms a ring-shaped structure to improve the ease of processing and the compatibility with the bare cell structure, thereby improving the stability and safety of use.

[0049] Specifically, in some implementations, such as Figure 1 and 4 As shown, the inner wall of the lower housing 2 is provided with a second inclined surface 203; the angle formed by the second inclined surface 203 and the horizontal plane it is located is α; α satisfies: 88°≤α≤90°. Wherein, α can be 88°, 88.5°, 88.6°, 89°, 89.5°, 89.6°, and 90°, etc. Preferably, it is 90°. That is to say, the inner wall of the lower housing 2 and its inner protrusion 21 form a circular draft feature, thereby improving the ease of processing and the compatibility with the bare battery cell structure, thus improving the stability and safety of use.

[0050] This utility model also proposes a secondary battery, such as Figure 5As shown, the secondary battery includes a cell body 3 and a battery casing structure. The cell body 3 includes an inner support 4, a separator 31, and a first electrode 32 and a second electrode 33 with opposite polarities. The first electrode 32, the separator 31, and the second electrode 33 are stacked sequentially and wound to form a (ring-shaped) winding. The inner wall of the winding is connected to the outer wall of the inner support 4, and the inner wall of the inner support 4 is connected to the wall surface of the inner protrusion 21 facing the placement cavity 201. The first electrode 32 can be either a positive electrode or a negative electrode; the second electrode 33 can be either a positive electrode or a negative electrode. The specific structure of the battery casing structure is as described in the above embodiments. Since this secondary battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. The inner support 4 is a tubular support structure to improve the adaptability of the assembly and ensure the support performance during the winding process.

[0051] In some implementation methods, such as Figure 5 and 6 As shown, the first electrode plate 32 is provided with a first electrode tab 301; the first electrode tab 301 is connected to the bottom of the electrode post 11; and one end of the first electrode tab 301 is bent and extended toward the inner wall of the lower housing 2 (and does not contact the inner wall of the lower housing 2, or is insulated); the second electrode plate 33 is provided with a second electrode tab 302; the second electrode tab 302 is connected to the inner bottom of the lower housing 2; and one end of the second electrode tab 302 is bent and extended toward the inner wall of the lower housing 2 (and does not contact the inner wall of the lower housing 2, or is insulated).

[0052] Specifically, in some implementations, such as Figure 5 and 6 As shown, the relationship between the width L4 of the inner support 4 and the inner protrusion L5 satisfies: L4 = L5 + (3μm ~ 6μm). That is, the inner diameter of the inner support 4 is slightly larger than the diameter of the inner protrusion mentioned above, so as to facilitate fitting into the inner wall of the lower shell during assembly.

[0053] Specifically, in some implementations, such as Figure 2 and 5 As shown, the relationship between the height h3 of the inner support 4 and the height h2 of the inner protrusion 21 satisfies: h3 ≤ h2. This structure, with an inner support of a suitable length, can effectively reduce material input and ensure orderly winding, while also guaranteeing the stability and safety of the structure.

[0054] Specifically, in some implementations, such as Figure 5As shown, the relationship between the width L1 of the upper cover plate 1 (excluding the first through hole 101), the width L3 of the placement cavity 201, and the difference L4 between the inner and outer diameters of the (annular) winding body satisfies: L1≥L3≥L4. This structure, through the use of an upper cover plate 1 of a certain appropriate length, placement cavity 201, and (annular) winding body, can effectively reduce material input and ensure the orderly assembly of the (annular) winding body, while guaranteeing the stability and safety of the structure.

[0055] Specifically, in some implementations, such as Figure 5 , 6 As shown in Figure 7, a cell insulating component 304 is provided between the winding body and the upper cover plate 1 and / or between the winding body and the lower housing 2; and the cell insulating component 304 is adhered to the winding body. The cell insulating component 304 is made of cell insulating adhesive paper, which includes a base tape and pressure-sensitive adhesive layers connected to both sides of the base tape; the base tape is made of cotton cloth, synthetic fiber fabric, or plastic film. Further, polyvinyl chloride electrical insulating tape is used.

[0056] The positive electrode includes a positive current collector and a positive active material layer, the latter being coated on the surface of the current collector. The current collector can be made of aluminum, and the active material layer includes a positive active material, such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode includes a negative current collector and a negative active material layer, the latter being coated on the surface of the current collector. The current collector can be made of copper, and the active material layer includes a negative active material, such as carbon or silicon. The separator 31 can be made of PP (polypropylene) or PE (polyethylene).

[0057] A rechargeable battery, also known as a secondary battery or accumulator battery, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. Utilizing the reversibility of chemical reactions, a new battery can be constructed; that is, after a chemical reaction converts into electrical energy, the electrical energy can be used to repair the chemical system, and then the chemical reaction can be converted back into electrical energy. Therefore, it is called a secondary battery (rechargeable battery). The main types of rechargeable batteries on the market include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and polymer lithium-ion batteries.

[0058] The present invention also proposes an electrical device, which includes a secondary battery. The specific structure of the secondary battery is as described in the above embodiments. Since the present electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0059] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical equipment.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A battery case structure, characterized by: The upper cover plate is provided with a first through hole; the first through hole is arranged through the upper cover plate; the upper cover plate is further provided with a mounting hole; The lower shell is connected to the upper cover plate; and the lower shell is provided with an inner protrusion; a placing cavity is arranged between the inner wall of the lower shell, the inner protrusion and the upper cover plate; the inner protrusion is provided with a second through hole; the second through hole is arranged through the inner protrusion; and the second through hole is communicated with the first through hole. The relationship between the height h1 of the inner wall of the lower shell and the height h2 of the inner protrusion satisfies: h1 = h2; 2. The battery case structure according to claim 1, wherein: And the top of the inner protrusion is connected with the bottom of the upper cover plate. The mounting hole is provided with a pole column; the mounting hole comprises a stepped portion and a third through hole arranged in sequence from inside to outside; the pole column comprises an extension portion and a main body portion connected with each other; the main body portion penetrates through the third through hole; and the extension portion is arranged in the stepped portion; 3. The battery case structure according to claim 1, wherein: Wherein, the relationship between the width d1 of the main body portion and the width d2 of the extension portion satisfies: d1 < d2; and / or the relationship between the width d2 of the extension portion and the width L1 of the upper cover plate at a position other than the first through hole 101 and the thickness L2 of the inner wall of the lower shell satisfies: d2 < L1-2* L2. A first inclined surface is arranged on the wall surface of the inner protrusion towards the placing cavity; 4. The battery case structure according to claim 3, wherein: And / or, the inner wall of the lower shell is provided with a second inclined surface. The included angle between the first inclined surface and the horizontal plane where the first inclined surface is located is β; β satisfies: 88°≤β≤90°; 5. The battery case structure according to claim 4, wherein: And / or, the included angle between the second inclined surface and the horizontal plane where the second inclined surface is located is α; α satisfies: 88°≤α≤90°. The upper cover plate is further provided with a shell insulating member; the shell insulating member is arranged between the inner wall of the mounting hole and the pole column; and the bottom of the shell insulating member extends to the placing cavity.

6. The battery case structure according to claim 3, wherein: The battery shell structure of any one of claims 1 to 6 is included; the electric core body comprises an inner support body, a separation film and first and second polar plates with opposite polarities; the first polar plate, the separation film and the second polar plate are sequentially stacked and wound to form a winding body; the inner wall of the winding body is connected to the outer side wall of the inner support body; and the inner side wall of the inner support body is connected to the inner wall surface of the inner protrusion towards the placing cavity.

7. A secondary battery characterized by comprising: The relationship between the width L4 of the inner support body and the width L5 of the inner protrusion satisfies: L4 = L5 + (3μm-6μm); 8. The secondary battery according to claim 7, characterized by: And / or, the relationship between the height h3 of the inner support body and the height h2 of the inner protrusion satisfies: h3≤h2; And / or, the relationship between the width L1 of the upper cover plate at a position other than the first through hole, the width L3 of the placing cavity and the difference L4 between the inner and outer diameters of the winding body satisfies: L1≥L3≥L4. The winding body and the upper cover plate and / or the winding body and the lower shell are provided with an electric core insulating member; and the electric core insulating member is connected to the winding body.

9. The secondary battery according to claim 7 or 8, characterized by: The secondary battery of any one of claims 7 to 9 is included.

10. An electrical device, characterized by: ​

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