Battery structure and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery structure and electric equipment. The battery structure comprises a cover body, a shell, a supporting part and a battery cell body, the cover body is connected to the shell; a mounting cavity is formed between the cover body and the shell; the battery cell body is arranged in the mounting cavity; the battery cell body comprises a first pole piece, a second pole piece and an isolating membrane; the first pole piece, the isolating membrane and the second pole piece are laminated and wound to form a winding body; the innermost ring of the winding body is the second pole piece; a central hole is formed in the winding body; the supporting part is arranged in the central hole and is connected with the second pole piece; and one end of the supporting part in the height direction is connected to the cover body or the shell. According to the utility model, the phenomenon of black spots / lithium precipitation caused by excessive deformation of the structure in the circulation process can be avoided; and the use stability and safety are improved.

Description

Technical Field

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

[0002] Steel-cased button batteries are small batteries widely used in products such as wireless Bluetooth headsets (TWS). The electromagnetic fields generated by the batteries during charging and discharging can affect the normal operation and accuracy of precision components that are sensitive to electromagnetic fields, thus impacting the playback quality of TWS headsets and other devices, creating noise and interference, and affecting user experience.

[0003] However, steel-shell snap-on cores are usually of a wound structure. In this type of wound core, the inner ring is unsupported. During the cycle, the inner ring is subjected to expansion and compression from the intermediate layer, which can easily cause structural changes. This can lead to loose contact between the inner ring electrodes, resulting in black spots or lithium plating. Therefore, it affects the safety and stability of the product. Utility Model Content

[0004] The purpose of this invention is to provide a battery structure that addresses the shortcomings of existing technologies and solves the technical problems of poor safety and stability in existing technologies.

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

[0006] A battery structure includes a cover, a housing, a support member, and a cell body; the cover is connected to the housing; and a mounting cavity is provided between the cover and the housing; the cell body is disposed in the mounting cavity; the cell body includes a first electrode, a second electrode, and a separator; and the first electrode, the separator, and the second electrode are stacked and wound to form a wound body; the innermost circle of the wound body is the second electrode; and a central hole is provided in the wound body; the support member is disposed in the central hole and is connected to the second electrode; one end of the support member along its height direction is connected to the cover or the housing.

[0007] Preferably, the relationship between the outer diameter D2 of the support component and the inner diameter D1 of the central hole satisfies: 1≤D2 / D1≤1.5.

[0008] Preferably, the supporting component includes an insulating contact section and a conductive section; one end of the insulating contact section is movably connected to one end of the conductive section, so that the insulating contact section can move toward or away from the conductive section.

[0009] Preferably, the end of the conductive segment away from the insulating contact segment is fixedly connected to the cover; the outer wall of the conductive segment abuts against the second electrode plate inside the central hole; the insulating contact segment passes through the central hole and extends toward the bottom of the housing;

[0010] Alternatively, one end of the conductive segment away from the insulating contact segment is fixedly connected to the inner bottom of the housing; the outer wall of the conductive segment abuts against the second electrode plate inside the central hole; one end of the insulating contact segment passes through the central hole and extends toward the bottom of the cover.

[0011] Preferably, the insulating contact section has a first arc-shaped contact surface on the side of its surface away from the conductive section;

[0012] And / or, the conductive segment has a second arc-shaped contact surface on the side of its surface away from the insulating contact segment.

[0013] Preferably, the insulating contact section has a first mounting groove inside; the opening of the first mounting groove faces the conductive section;

[0014] And / or, the conductive segment has a second mounting groove inside; the opening of the second mounting groove faces the insulating contact segment.

[0015] Preferably, the interior of the first mounting groove is filled with a first filler.

[0016] And / or, the interior of the second mounting slot is filled with a second filler.

[0017] Preferably, the first filler is phenolic resin, porous zinc oxide, or hierarchical porous carbon;

[0018] And / or, the second filler is phenolic resin, porous zinc oxide, or hierarchical porous carbon.

[0019] Preferably, the support component further includes a movable member; one end of the movable member is connected to the interior of the first mounting groove; the other end of the movable member is connected to the interior of the second mounting groove;

[0020] The movable component is a compression spring or made of rubber.

[0021] This utility model also discloses an electrical device, including the aforementioned battery structure.

[0022] The beneficial effects of this utility model are as follows: By assembling the support component inside the central hole, the support for the innermost second electrode is improved, thereby helping to avoid excessive structural deformation during cycling, which could lead to black spots / lithium plating; improving the stability and safety of use; and by having the support component located in the central hole and acting as a tab corresponding to the second electrode, the addition of a tab structure can be effectively avoided; thus reducing the need for welding one tab to the cover or one tab to the shell; thereby saving space and effectively improving the energy density (ED) of the battery cell; and reducing the risk of failure due to metal strip breakage during mechanical performance testing; thus improving the stability and safety of use. Attached Figure Description

[0023] The following will refer to the appendix. Figures 1-5 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0024] Figure 1 This is a schematic diagram of the battery structure according to one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the battery structure according to another embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the supporting component of a battery structure according to an embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional view of the support component of a battery structure according to an embodiment of the present invention;

[0028] Figure 5 This is a cross-sectional view of the support component of a battery structure according to an embodiment of the present invention.

[0029] In the diagram: 1-Cover; 2-Shell; 101-Mounting cavity; 11-Electrode post; 3-Cell body; 31-Separating membrane; 32-First electrode; 321-First electrode tab; 33-Second electrode; 301-Center hole; 4-Supporting component; 41-Insulating contact section; 411-First arc-shaped contact surface; 412-First mounting groove; 413-First filler; 42-Conductive section; 421-Second arc-shaped contact surface; 422-Second mounting groove; 423-Second filler; 43-Moving component. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0036] like Figure 1 and 2As shown in one embodiment of this utility model, the battery structure includes a cover 1, a housing 2, a support member 4, and a cell body 3. The cover 1 is connected to the housing 2, and an installation cavity 101 is provided between the cover 1 and the housing 2. The cell body 3 is disposed within the installation cavity 101. The cell body 3 includes a first electrode 32, a second electrode 33, and a separator 31. The first electrode 32, the separator 31, and the second electrode 33 are stacked and wound to form a wound body. The innermost ring of the wound body is the second electrode 33. A central hole 301 is provided within the wound body. The support member 4 is disposed within the central hole 301 and is connected to the second electrode 33. One end of the support member 4 along its height direction is connected to the cover 1 or the housing 2. The connection between the cover 1 and the housing 2 is insulated (e.g., separated by insulating glue or insulating gaskets). The height direction is the thickness direction of the cover 1 and the housing 2.

[0037] The technical solution of this utility model improves the support for the innermost second electrode by assembling a support component inside the central hole. This helps to avoid excessive structural deformation during cycling, which could lead to black spots / lithium plating. It also improves the stability and safety of use. Furthermore, by positioning the support component in the central hole and acting as a tab corresponding to the second electrode, it effectively avoids the need for additional tab structures. This reduces the number of tabs welded to the cover or the shell, saving space and effectively increasing the energy density (ED) of the battery cell. It also reduces the risk of failure due to metal strip breakage during mechanical performance testing, further enhancing the stability and safety of use.

[0038] In some embodiments, when the support component 4 is assembled integrally with the cover 1, one end of the support component 4 is welded to the cover 1. This structure ensures the assembly stability of the support component 4, preventing it from breaking too easily from the cover 1 during charging tab operation, thereby improving stability and safety in use. In other embodiments, when the support component 4 is assembled integrally with the housing 2, the support component 4 and the housing 2 are cast as a single unit. This structure ensures the assembly stability of the support component 4, preventing it from breaking too easily from the housing 2 during charging tab operation, thereby improving stability and safety in use.

[0039] Specifically, in some implementations, such as Figure 1 and 2As shown, the support component 4 is a cylindrical support column; and the relationship between the outer diameter D2 of the support column and the inner diameter D1 of the central hole 301 satisfies: 1≤D2 / D1≤1.5. That is to say, through a reasonable and appropriate diameter ratio, it can be ensured that the cylindrical support column can be smoothly inserted into the central hole 301, and at the same time, it can be squeezed along the diameter direction; thus, it can be ensured that the support column can be in close contact with the innermost second pole piece 33.

[0040] Specifically, in some of these implementations, such as Figure 1 As shown, the support component 4 includes an insulating contact section 41 and a conductive section 42; one end of the insulating contact section 41 is movably connected to one end of the conductive section 42, allowing the insulating contact section 41 to move toward or away from the conductive section 42; and the end of the conductive section 42 away from the insulating contact section 41 is fixedly connected to the cover 1 (furthermore, the conductive section 42 is welded to the pole post 11 of the cover 1); the outer wall of the conductive section 42 abuts against the second pole piece 33 inside the central hole 301; the insulating contact section 41 passes through the central hole 301 and extends toward the bottom of the housing 2. In some embodiments, such as... Figure 1 As shown, the first electrode 32 is provided with a first tab 321; one end of the first tab 321 is connected to the inner bottom of the housing 2; and the insulating contact section 41 passes through the central hole 301 and abuts against the first tab 321. That is to say, by connecting the conductive section 42 at one end of the support member 4 to the cover 1, and combining the insulating contact section 41 abutting against the first tab 321 and the first tab 321 being connected to the housing 2, one tab is reduced from being welded to the cover or the housing; thus saving space; and enabling the pushing and squeezing of the second tab, improving the fit of the inner ring electrode of the core. The material of the conductive section 42 is the same as the current collector material of the second electrode 33.

[0041] Specifically, in other implementations, such as Figure 2 As shown, the support component 4 includes an insulating contact section 41 and a conductive section 42; one end of the insulating contact section 41 is movably connected to one end of the conductive section 42, allowing the insulating contact section 41 to move toward or away from the conductive section 42; and the end of the conductive section 42 away from the insulating contact section 41 is fixedly connected to the inner bottom of the housing 2; the outer wall of the conductive section 42 abuts against the second electrode 33 inside the central hole 301 (i.e., the material of the conductive section 42 is the same as the current collector material of the second electrode 33); one end of the insulating contact section 41 passes through the central hole 301 and extends toward the bottom of the cover 1. Further, the insulating contact section 41 abuts against the pole post 11 of the cover 1. In some embodiments, such as... Figure 2As shown, the first electrode 32 is provided with a first electrode tab 321; one end of the first electrode tab 321 is connected to the inner bottom of the cover 1 (middle electrode post 11); and the insulating contact section 41 passes through the central hole 301 and abuts against the first electrode tab 321. That is to say, by connecting the conductive section 42 at one end of the support member 4 to the housing 2, and combining the insulating contact section 41 abutting against the first electrode tab 321 and the first electrode tab 321 being connected to the cover 1, one electrode tab is reduced from being welded to the cover or to the housing; thus saving space; and achieving the pushing and squeezing of the second electrode tab, improving the fit of the inner ring electrode of the core.

[0042] Specifically, in some implementations, such as Figure 1 and 3 As shown, the insulating contact section 41 has a first arc-shaped contact surface 411 on the side away from the conductive section 42. This structure, through the arc-shaped guiding effect of the first arc-shaped contact surface 411, can ensure that the support column of the cylindrical structure can be smoothly inserted into the central hole 301, thereby improving the smoothness and stability of assembly.

[0043] Specifically, in some implementations, such as Figure 1 and 4 As shown, the conductive section 42 has a second arc-shaped contact surface 421 on the side away from the insulating contact section 41. This structure enables welding and assembly of the arc-shaped side end through the second arc-shaped contact surface 421, thereby improving the convenience of assembly operations and enhancing assembly stability.

[0044] Specifically, in some implementations, such as Figure 3 and 4 As shown, the insulating contact section 41 has a first mounting groove 412 inside; the opening of the first mounting groove 412 faces the conductive section 42; and / or, the conductive section 42 has a second mounting groove 422 inside; the opening of the second mounting groove 422 faces the insulating contact section 41. That is to say, through the hollow insulating contact section 41 and the conductive section 42, the weight of the support component 4 can be reduced and a buffering effect can be played, thereby improving the stability of the structure; in addition, since the conductive section 42 is made of metal, it has a certain shrinkage performance; therefore, the conductive section 42 and its hollow design can expand and contract along the diameter direction to ensure that the support component 4 is in close contact with the foil of the inner ring, thereby acting as an electrode tab.

[0045] Specifically, in some implementations, such as Figure 4 and 5As shown, the first mounting groove 412 is filled with a first filler 413; and / or, the second mounting groove 422 is filled with a second filler 423. The first filler 413 is phenolic resin, porous zinc oxide, or graded porous carbon; the second filler 423 is phenolic resin, porous zinc oxide, or graded porous carbon. In other words, phenolic resin, porous zinc oxide, or graded porous carbon can improve liquid retention capacity.

[0046] Specifically, in some implementations, such as Figure 3 and 4 As shown, the support component 4 also includes a movable member 43; one end of the movable member 43 is connected to the interior of the first mounting groove 412; the other end of the movable member 43 is connected to the interior of the second mounting groove 422, so that the insulating contact section 41 can move toward or away from the conductive section 42. The movable member 43 is a compression spring or a rubber material. That is, the elastic movement of the compression spring or rubber material allows the insulating contact section 41 to extend and retract along the height direction, ensuring tight contact between the support component and the cover or shell.

[0047] Specifically, in some embodiments, the first electrode 32 is either a positive electrode or a negative electrode; the second electrode 33 is either a positive electrode or a negative electrode. That is, when the first electrode 32 is a positive electrode, the second electrode 33 is a negative electrode. When the first electrode 32 is a negative electrode, the second electrode 33 is a positive electrode. The positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector; the positive current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area, the positive electrode coating area being coated with the positive active material layer, and the positive electrode tab not being coated with the positive active material layer. Further, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, the negative electrode coating area being coated with the negative electrode active material layer, and the negative electrode tab not being coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes negative electrode active material, which can be carbon or silicon, etc. The material of the separator 31 can be PP (polypropylene) or PE (polyethylene), etc.

[0048] This utility model also proposes an electrical device, which includes a battery structure. The specific structure of the battery structure is as described in the above embodiments. Since this 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.

[0049] 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.

[0050] 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.

[0051] 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 structure, characterized by: The battery structure comprises a cover, a shell, a supporting component and an electrode core body; the cover is connected to the shell; an installation cavity is arranged between the cover and the shell; the electrode core body is arranged in the installation cavity; the electrode core body comprises a first pole piece, a second pole piece and a separator; the first pole piece, the separator and the second pole piece are stacked and wound to form a winding body; the innermost circle of the winding body is the second pole piece; a center hole is arranged in the winding body; the supporting component is arranged in the center hole and connected to the second pole piece; one end of the supporting component along the height direction is connected to the cover or the shell.

2. The battery structure of claim 1, wherein: The relationship between the outer diameter D2 of the supporting component and the inner diameter D1 of the center hole satisfies 1≤D2 / D1≤1.

5.

3. The battery structure according to claim 1 or 2, characterized by: The supporting component comprises an insulating contact section and a conductive section; one end of the insulating contact section is movably connected to one end of the conductive section, so that the insulating contact section can move towards or away from the conductive section.

4. The battery structure of claim 3, wherein: One end of the conductive section away from the insulating contact section is fixedly connected to the cover; the outer side wall of the conductive section abuts against the second pole piece in the center hole; the insulating contact section passes through the center hole and extends towards the bottom of the shell; Or one end of the conductive section away from the insulating contact section is fixedly connected to the inner bottom of the shell; the outer side wall of the conductive section abuts against the second pole piece in the center hole; one end of the insulating contact section passes through the center hole and extends towards the bottom of the cover.

5. The battery structure of claim 3, wherein: A first arc-shaped contact surface is arranged on the side surface of the insulating contact section away from the conductive section; And / or, a second arc-shaped contact surface is arranged on the side surface of the conductive section away from the insulating contact section.

6. The battery structure of claim 3, wherein: A first installation groove is arranged in the insulating contact section; the opening of the first installation groove faces the conductive section; And / or, a second installation groove is arranged in the conductive section; the opening of the second installation groove faces the insulating contact section.

7. The battery structure of claim 6, wherein: A first filling piece is arranged in the first installation groove; And / or, a second filling piece is arranged in the second installation groove.

8. The battery structure of claim 7, wherein: The first filling piece is phenolic resin or porous zinc oxide or hierarchical porous carbon; And / or, the second filling piece is phenolic resin or porous zinc oxide or hierarchical porous carbon.

9. The battery structure of claim 6, wherein: The supporting component further comprises a movable piece; one end of the movable piece is connected to the inside of the first installation groove; the other end of the movable piece is connected to the inside of the second installation groove; The movable piece is an extrusion spring or a rubber material.

10. An electrical device, characterized by: The battery structure comprises the battery structure according to any one of claims 1 to 9.

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