Battery cover plate structure, battery protection shell and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cover plate structure, a battery protection shell and a battery. The battery cover plate structure comprises a sealing component, a composite component and a supporting component which are sequentially stacked, the supporting part comprises a fitting part and a mounting part which are connected with each other; the attaching part is arranged in a manner of inclining outwards away from one side of the composite part; a first inclined surface is arranged on the mounting part; and the composite part is connected to the first inclined surface. According to the battery cover plate structure, the supporting stability can be improved, and the sealing capability of the battery cover plate structure is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery cover plate structure, a battery protection shell and a battery. Background Art

[0002] Lithium batteries are widely used in various industries, such as 3C electronics and new energy vehicles. However, due to their own characteristics, lithium batteries have major safety issues, such as fire and explosion. Especially in the field of electric vehicles, batteries, as key components of power output, are related to the safety of vehicles and the safety of people's lives. As the core component of the battery assembly, the reliability of the power battery cover has a huge impact on the normal use of the car.

[0003] However, conventional parallel composite cover plates on the market have a weak ability to withstand internal and external pressures of the battery, and the composite layer is subjected to stress beyond its bearing range and is prone to composite failure and peeling. In addition, the cover plate is easily welded through during the welding process. Therefore, the structural stability of conventional parallel composite cover plates is not strong, resulting in unstable sealing performance, which affects the safety and stability of battery use. Utility Model Content

[0004] The utility model aims to provide a battery cover structure to solve the problems that the existing battery has a weak ability to withstand internal and external pressures, the composite layer is subjected to stress exceeding the bearing range and is prone to composite failure and peeling.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery cover structure comprises a sealing component, a composite component and a supporting component which are stacked in sequence; the supporting component comprises a fitting portion and a mounting portion which are connected to each other; and the fitting portion is arranged to be inclined outward away from one side of the composite component; the mounting portion is provided with a first inclined surface; and the composite component is connected to the first inclined surface.

[0007] Preferably: a first inner cavity is provided between the fitting portion and the mounting portion; the first inclined surface is provided at the bottom of the first inner cavity; and the composite component is provided inside the first inner cavity.

[0008] Preferably, an angle α is provided between the fitting portion and the mounting portion; the value range of α is: 130°≤α≤140°.

[0009] Preferably: a second inclined surface is provided at a side end of the composite component; and the second inclined surface is connected to the first inclined surface.

[0010] Preferably: a third slope is provided at a side end of the sealing component; a second inner cavity is provided in the composite component; and the third slope is connected to an inner wall of the second inner cavity.

[0011] Preferably: the battery cover structure further includes an insulating component; the insulating component is connected to one side end surface of the mounting portion and is arranged opposite to the composite component.

[0012] The utility model also discloses a battery protection shell, comprising a shell and the above-mentioned battery cover plate structure; the battery cover plate structure is arranged at the opening of the shell.

[0013] Preferably: an assembly slope is provided at the opening of the shell; the bottom side surface of the fitting portion is connected to the assembly slope;

[0014] Wherein, an angle β is provided between the assembly slope and the body of the shell; the value range of the angle β is: 130°≤β≤140°.

[0015] Preferably, the relationship between the outer diameter L1 of the battery cover structure and the inner diameter L2 of the shell satisfies: L1>L2.

[0016] The utility model also discloses a battery, comprising the battery protection shell mentioned above.

[0017] The beneficial effect of the utility model lies in that the technical scheme can effectively increase the peel strength of the battery cover structure from the first inclined surface by adopting a composite structure in which a sealing component and a composite component are assembled to the first inclined surface, so as to realize a dual support mode of the bonding stress of the composite component and the shear stress of the inclined surface, thereby improving the support stability of the battery cover structure and ensuring its sealing performance; and through the horizontal support stress of the mounting part and the inclined support stress of the fitting part, the external stress of the cover structure can be effectively decomposed and dispersed, thereby improving the support stability and ensuring its sealing performance; in addition, through the dual sealing effect of the sealing component and the composite component, its sealing performance can be improved and its safety and stability in use can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following will refer to the attached Figures 1 to 5 To describe the features, advantages and technical effects of exemplary embodiments of the present utility model.

[0019] Figure 1 This is a schematic structural diagram of a battery cover structure according to an embodiment of the utility model;

[0020] Figure 2 An exploded view of a battery cover structure according to an embodiment of the utility model;

[0021] Figure 3 This is a schematic structural diagram of a supporting component of a battery cover structure according to an embodiment of the utility model;

[0022] Figure 4 This is a schematic structural diagram of a battery protection case according to an embodiment of the utility model;

[0023] Figure 5 The figure is a schematic structural diagram of a shell of a battery protection shell according to an embodiment of the present utility model.

[0024] In the figure: 1-sealing component; 101-third slope; 2-composite component; 201-second slope; 202-second inner cavity; 3-support component; 31-fitting part; 301-first slope; 302-first through hole; 32-installation part; 4-insulating component; 5-shell; 51-assembly slope. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship between a battery cover structure, a battery protective shell, and a battery to describe associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are an "or" relationship between a battery cover structure, a battery protective shell, and a battery.

[0029] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] The following is combined with Figure 1 to Figure 5 The utility model is further described in detail, but it is not intended to limit the utility model.

[0033] like Figure 1 and 2 As shown, in one embodiment of the utility model, the battery cover structure comprises a sealing component 1, a composite component 2 and a supporting component 3 which are stacked in sequence; the supporting component 3 comprises a fitting portion 31 and a mounting portion 32 which are connected to each other; and the fitting portion 31 is arranged to be inclined outward away from one side of the composite component 2; a first inclined surface 301 is provided on the mounting portion 32; and the composite component 2 is connected to the first inclined surface 301.

[0034] The technical solution of the utility model adopts a composite structure of an inclined surface in which a sealing component and a composite component are assembled to the first inclined surface, and can effectively increase the peel strength of the battery cover structure from the first inclined surface, so as to realize a dual support mode of the bonding stress of the composite component and the shear stress of the inclined surface, thereby improving the support stability of the battery cover structure and ensuring its sealing performance; and through the horizontal support stress of the mounting portion and the inclined support stress of the fitting portion, the external stress of the cover structure can be effectively decomposed and dispersed, thereby improving the support stability and ensuring its sealing ability; in addition, through the dual sealing effect of the sealing component and the composite component, its sealing performance can be improved and its safety and stability in use can be ensured.

[0035] Specifically, in some embodiments, a first inner cavity 303 is provided between the inner side of the fitting portion 31 and the inner side of the mounting portion 32; the first inclined surface 301 is provided at the bottom of the first inner cavity 303; and the composite component 2 is provided inside the first inner cavity 303. The structure can improve the sealing performance of the cover plate structure and ensure the safety and stability of its use by bonding and assembling the composite component 2 to the inner wall of the first inner cavity 303 and sealing and filling the sealing component 1 inside the first inner cavity 303. Among them, in some embodiments, the shape of the first inner cavity 303 is a truncated cone cavity in the upper half and a truncated cone cavity in the lower half, and the bottom surface of the truncated cone cavity in the upper half is the top surface of the truncated cone in the lower half. The shape of the supporting component 3 is a triangular steel ring with a triangular bottom cross section and a ring-shaped upper end cross section; and then the internal and external force points are dispersed from concentrated to the surroundings through the triangular steel ring, thereby increasing the upper limit of the pressure bearing and improving the sealing stability.

[0036] Specifically, in some embodiments, Figure 3 As shown, an angle α is provided between the fitting portion 31 and the mounting portion 32; the value range of α is: 130°≤α≤140°. Preferably, α=135°. The 135° bevel fitting can prevent the cover plate from being pressed down too low during the assembly process of the support component 3, realize the limiting effect and seamless welding, and improve the assembly welding stability and dimensional consistency.

[0037] Specifically, in some embodiments, Figure 2 As shown, the bottom of the support component 3 is provided with a first through hole 302; the bottom of the composite component 2 is provided with a second through hole corresponding to the first through hole 302. The composite component 2 is provided with a second inner cavity 202; the second inner cavity 202 is connected to the second through hole. Further, the side end of the composite component 2 is provided with a second inclined surface 201; the second inclined surface 201 is connected to the first inclined surface 301. In other words, the composite component 2 is funnel-shaped; the material of the composite component 2 is PP glue or PC glue. This structure can improve the compactness of the assembly of the support component 3 and the composite component 2.

[0038] Specifically, in some embodiments, Figure 2 As shown, the side end of the sealing component 1 is provided with a third inclined surface 101, and the third inclined surface 101 is connected to the inner wall of the second inner cavity 202. Among them, the shape of the sealing component 1 is a sealing block with a trapezoidal cross section. In other words, the peeling strength of the composite cover plate with a trapezoidal triangular inclined surface is the unit area bonding force (horizontal direction) + shear force (inclined direction); while the peeling strength of the flat composite cover plate of the prior art only contains the unit area bonding force; thus, the peeling strength of the structure is higher than that of the conventional lithium-ion battery structure; thereby increasing the upper limit of the pressure resistance and improving the sealing stability.

[0039] Specifically, in some embodiments, Figure 1As shown, the battery cover structure also includes an insulating component 4; the insulating component 4 is connected to one side end surface of the mounting portion 32 and is arranged opposite to the composite component 2. The insulating component 4 is an insulating glue; further, the insulating glue is acrylic insulating glue, polyurethane insulating glue, silicone insulating glue, UV type insulating glue, etc. The structure can effectively separate the positive and negative poles through the insulating performance of the insulating component 4, and improve the insulation effect of the battery cover structure from the outside and the inside, thereby improving the safety and stability of use. The insulating component 4 is provided with a third through hole 41 corresponding to the first through hole 302.

[0040] The utility model also provides a battery protection shell, such as Figure 4 As shown, the battery protective shell includes a shell 5 and a battery cover structure connected to the opening of the shell. The specific structure of the battery cover structure refers to the above embodiment. Since the battery protective shell adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0041] Among them, Figure 4 and 5 As shown, an assembly bevel 51 is provided at the opening of the shell 5; the bottom side surface of the fitting portion 31 is connected to the assembly bevel 51. This structure can improve the compactness of the filling between the shell 5 and the cover plate, and can ensure its sealing performance. Among them, an angle β is provided between the assembly bevel 51 and the main body of the shell 5; the value range of the angle β is: 130°≤β≤140°. Preferably, β=135°. The 135° bevel interlocking type can prevent the cover plate from being pressed down too low during the assembly process of the support component 3 and the shell 5, realize the limiting effect and seamless welding, and improve the assembly welding stability and dimensional consistency.

[0042] Among them, Figure 4 As shown, the relationship between the outer diameter L1 of the battery cover structure and the inner diameter L2 of the shell 5 satisfies: L1>L2. In other words, the total composite length of the trapezoidal slope of the battery cover structure is greater than the inner diameter of the shell 5, and is also greater than the total composite length of the plane of the conventional lithium battery structure cover; thereby achieving the peel strength of the composite cover with trapezoidal triangular slopes as unit area adhesive force (horizontal direction) + shear force (inclined direction); at the same time, the triangular steel ring is combined to disperse the internal and external force points from concentrated to all around, thereby increasing the upper limit of the pressure resistance and improving the sealing stability.

[0043] The utility model also proposes a battery, which includes a battery protection shell. The specific structure of the battery protection shell refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0044] Among them, battery refers to a cup, trough or other container or part of a composite container that contains electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy; the battery has positive and negative electrodes. With the advancement of science and technology, batteries generally refer to small devices that can generate electrical energy, such as solar cells. The performance parameters of batteries mainly include electromotive force, capacity, specific energy and resistance. Battery principle: In chemical batteries, the direct conversion of chemical energy into electrical energy is the result of spontaneous oxidation, reduction and other chemical reactions inside the battery, which are carried out on the two electrodes respectively. The negative electrode active material is composed of a reducing agent with a relatively negative potential and stable in the electrolyte, such as active metals such as zinc, cadmium, and lead, and hydrogen or hydrocarbons. The positive electrode active material is composed of an oxidizing agent with a relatively positive potential and stable in the electrolyte, such as metal oxides such as manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, oxygen-containing acids and their salts, etc. The electrolyte is a material with good ionic conductivity, such as an aqueous solution of acid, alkali, or salt, an organic or inorganic non-aqueous solution, a molten salt, or a solid electrolyte.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0046] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A battery cover structure, characterized in that: It comprises a sealing component, a composite component and a supporting component which are stacked in sequence; the supporting component comprises a fitting portion and a mounting portion which are connected to each other; and the fitting portion is arranged to be inclined outward away from one side of the composite component; the mounting portion is provided with a first inclined surface; and the composite component is connected to the first inclined surface.

2. The battery cover structure according to claim 1, characterized in that: A first inner cavity is provided between the fitting portion and the mounting portion; the first inclined surface is provided at the bottom of the first inner cavity; and the composite component is provided inside the first inner cavity.

3. The battery cover structure according to claim 1 or 2, characterized in that: An angle α is provided between the fitting portion and the mounting portion; the value range of α is: 130°≤α≤140°.

4. The battery cover structure according to claim 1 or 2, characterized in that: A second inclined surface is provided at the side end of the composite component; the second inclined surface is connected to the first inclined surface.

5. The battery cover structure according to claim 1 or 2, characterized in that: A third slope is provided at the side end of the sealing component; a second inner cavity is provided in the composite component; and the third slope is connected to the inner wall of the second inner cavity.

6. The battery cover structure according to claim 1, characterized in that: The battery cover structure also includes an insulating component; the insulating component is connected to one side end surface of the mounting portion and is arranged opposite to the composite component.

7. A battery protective shell, characterized in that: It comprises a shell and the battery cover structure according to any one of claims 1 to 6; the battery cover structure is arranged at the opening of the shell.

8. The battery protection case according to claim 7, characterized in that: The opening of the shell is provided with an assembly inclined surface; the bottom side surface of the fitting portion is connected to the assembly inclined surface; Wherein, an angle β is provided between the assembly slope and the body of the shell; the value range of the angle β is: 130°≤β≤140°.

9. The battery protection case according to claim 7, characterized in that: The relationship between the outer diameter L1 of the battery cover structure and the inner diameter L2 of the shell satisfies: L1>L2.

10. A battery, characterized in that: A battery protection case comprising any one of claims 7 to 9.

Images