Explosion-proof structure and battery

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to an explosion-proof structure, which comprises an explosion-proof piece, a nick is arranged on the explosion-proof piece, the nick comprises a bottom surface and two side surfaces connected with the bottom surface, and each side surface comprises a first surface, a step surface and a second surface which are sequentially connected along the depth direction. The plane where the two first faces are located forms an obtuse angle with the bottom face, the step faces are arranged away from the bottom face, and the nick can be formed through two-step stamping. The two-step punching can reduce the punching depth of each step, so that the material can be prevented from being extruded to the end face, the planeness of the end face can be improved, and the service life of the punch can be prolonged. The utility model provides a battery which comprises the explosion-proof structure, and the explosion-proof structure is arranged on the shell of the battery. According to the battery, the planeness of the end face can be improved, and the service life of the punch can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, in particular to an explosion-proof structure and a battery. Background Art

[0002] In order to ensure the safety of battery use, an explosion-proof structure is generally provided inside the battery, and the explosion-proof structure includes notches. When the gas pressure inside the battery exceeds the opening pressure of the explosion-proof structure, the explosion-proof structure can be opened at the notch to release the gas pressure inside the battery to prevent the battery from exploding.

[0003] The prior art often uses notches with a trapezoidal cross section. For example, in the patent application number CN201922127781.1, the cross section of the notch is an inverted trapezoid. However, in the actual processing process, the notch of the above structure needs to be formed by a single stamping, but a single stamping easily causes the material to be squeezed toward the periphery, so that a bulge is formed on the end face, affecting the flatness of the end face and easily reducing the life of the punch. Utility Model Content

[0004] One purpose of the utility model is to provide an explosion-proof structure, which helps to improve the flatness of the end face and prolong the life of the punch.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Provided is an explosion-proof structure, comprising an explosion-proof component, wherein the explosion-proof component is provided with a notch, wherein the notch comprises a bottom surface and two side surfaces connected to the bottom surface, wherein the two side surfaces each comprise a first surface, a step surface and a second surface sequentially connected along a depth direction, wherein the planes where the two first surfaces are located each form an obtuse angle with the bottom surface, and the step surfaces are each arranged away from the bottom surface, and wherein the notch can be formed by two-step stamping.

[0007] Optionally, both of the two second surfaces form an obtuse angle with the bottom surface.

[0008] Optionally, the obtuse angles formed by the planes where the two first surfaces are located and the bottom surface are equal;

[0009] and / or, the obtuse angles formed by the two second surfaces and the bottom surface are equal;

[0010] And / or, an obtuse angle formed between the plane where the first surface is located and the bottom surface is equal to an obtuse angle formed between the second surface and the bottom surface.

[0011] Optionally, the end surface of the explosion-proof component where the notch is formed and the junctions with the two first surfaces are in smooth transition.

[0012] Optionally, there is a smooth transition between the step surface of one of the side surfaces and the second surface.

[0013] Optionally, both of the second surfaces smoothly transition to the bottom surface.

[0014] Optionally, the bottom surface is parallel to the back side of the end surface of the explosion-proof component where the notch is formed.

[0015] Optionally, the notch is a closed polygon, circle or ellipse, or the notch is an open polygon, circle or ellipse.

[0016] Another object of the utility model is to provide a battery that helps to improve the flatness of the end surface and prolong the life of the punch.

[0017] To achieve this purpose, the utility model adopts the following technical solutions:

[0018] A battery is provided, comprising the above-mentioned explosion-proof structure, wherein the explosion-proof structure is arranged on a housing of the battery.

[0019] Optionally, the explosion-proof component is an end cover of the shell, or the explosion-proof structure is arranged on the end cover of the shell.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides an explosion-proof structure, including an explosion-proof part, on which a notch is arranged, the notch includes a bottom surface and two side surfaces connected to the bottom surface, the two side surfaces each include a first surface, a step surface and a second surface sequentially connected along a depth direction, the planes where the two first surfaces are located are both at an obtuse angle to the bottom surface, the step surfaces are both arranged away from the bottom surface, and the notch can be formed by two-step stamping. The two-step stamping can reduce the depth of each step of stamping, thereby preventing the material from being squeezed to the end surface, helping to improve the flatness of the end surface, and prolonging the life of the punch.

[0022] The utility model provides a battery, comprising the above-mentioned explosion-proof structure, wherein the explosion-proof structure is arranged on the battery housing, and the battery helps to improve the flatness of the end surface and prolong the life of the punch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the explosion-proof component provided by the embodiment of the utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the explosion-proof component provided by the embodiment of the utility model. Figure 2 ;

[0025] Figure 3 yes Figure 2 A cross-sectional view at AA;

[0026] Figure 4 yes Figure 3 An enlarged view of point B.

[0027] In the figure:

[0028] 1. explosion-proof part; 11. notch; 111. bottom surface; 112. side surface; 1121. first surface; 1122. step surface; 1123. second surface; 12. end surface; 13. back surface. DETAILED DESCRIPTION

[0029] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0030] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0031] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0032] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0033] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0034] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0035] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0036] like Figure 1-Figure 4 As shown, the explosion-proof structure of this embodiment includes an explosion-proof part 1, and a notch 11 is arranged on the explosion-proof part 1. The notch 11 includes a bottom surface 111 and two side surfaces 112 connected to the bottom surface 111. The two side surfaces 112 include a first surface 1121, a step surface 1122, and a second surface 1123 connected in sequence along the depth direction. The plane where the first surface 1121 is located is at an obtuse angle to the bottom surface 111, and the step surface 1122 is set away from the bottom surface 111. The notch 11 can be formed by two-step stamping. The two-step stamping can reduce the depth of each step of stamping, thereby preventing the material from being squeezed to the end surface 12, which helps to improve the flatness of the end surface 12 and prolong the life of the punch.

[0037] In this embodiment, the notch 11 can be formed by two-step stamping, the first step is to stamp to the depth of the step surface 1122, and the second step is to stamp to the bottom surface 111 of the notch 11. When the depth of the notch 11 remains unchanged, compared with the prior art in which a one-step stamping directly forms an inverted trapezoidal groove, the first step of the present invention extrude less material, and the possibility of forming a protrusion on the end face 12 is lower, while the second step of stamping can extrude the material to the step surface 1122 or the upper side 112, which will not affect the flatness of the end face 12. And reducing the depth of each step of stamping will inevitably reduce the impact force on the punch and reduce wear. Not only that, it can also reduce problems such as stamping fracture caused by processing errors and leakage at the notch 11, further ensuring the quality of the battery. Therefore, the above-mentioned explosion-proof structure helps to improve the flatness of the end face 12, ensure the quality of the battery, and extend the life of the punch.

[0038] Optionally, the two second surfaces 1123 are both at an obtuse angle with the bottom surface 111. That is, the notch 11 is a superposition of two grooves with inverted trapezoidal cross sections, the long side of the first inverted trapezoid is located at the opening of the notch 11, the two side sides correspond to the two first surfaces 1121, and the short side is located at the step surface 1122. The long side of the second inverted trapezoid is located in the hollow of the step surface 1122, the two side sides correspond to the two second surfaces 1123, and the short side is located at the bottom surface 111 of the notch 11. The inclined surface of the inverted trapezoid helps the material to be squeezed and displaced during stamping, which helps to ensure good stamping quality.

[0039] Optionally, the obtuse angles formed by the plane where the two first faces 1121 are located and the bottom face 111 are equal, that is, the first inverted trapezoid is an isosceles trapezoid. Optionally, the obtuse angles formed by the two second faces 1123 and the bottom face 111 are equal, that is, the second inverted trapezoid is an isosceles trapezoid. Optionally, the obtuse angle formed by the plane where the first face 1121 is located and the bottom face 111 is equal to the obtuse angle formed by the second face 1123 and the bottom face 111. The above design helps to ensure the accuracy of the blasting position and direction during blasting.

[0040] Optionally, the junctions between the end surface 12 of the explosion-proof component 1 with the notch 11 and the two first surfaces 1121 are smoothly transitioned to avoid damage to other components due to sharp edges. Optionally, the step surface 1122 of one side surface 112 is smoothly transitioned to the second surface 1123. Optionally, the two second surfaces 1123 are smoothly transitioned to the bottom surface 111.

[0041] Optionally, the bottom surface 111 is parallel to the back surface 13 of the end surface 12 of the explosion-proof component 1 where the notch 11 is provided, so as to ensure that the center of the bottom surface 111 is broken during explosion.

[0042] Optionally, the notch 11 is a closed polygon, circle or ellipse, or the notch 11 is an open polygon, circle or ellipse. In this embodiment, the notch 11 is a closed circle, and the shape of the notch 11 can be adjusted according to the form of the explosion-proof structure and the space conditions where the explosion-proof structure is set.

[0043] This embodiment also provides a battery, including the above-mentioned explosion-proof structure, which is arranged on the battery housing. The housing can be a battery cell housing inside the battery, or a battery module housing, or a battery pack housing. The battery helps to improve the flatness of the end face 12 and prolong the life of the punch.

[0044] Optionally, the explosion-proof component 1 is an end cap of the housing, that is, the end cap is directly stamped with a notch 11, so that the end cap has an explosion-proof function, which can save processing steps and reduce costs. Of course, the end cap can be round for cylindrical batteries, or rectangular for cuboid batteries.

[0045] Optionally, the explosion-proof structure can also be provided as a separate structure on the end cover of the housing, and the explosion-proof structure can be connected to the end cover by welding, etc. Optionally, the explosion-proof structure also includes other components of the explosion-proof valve, and the other components are all prior art and will not be described in detail here.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Explosion-proof structure, characterized in that: The invention comprises an explosion-proof component (1), wherein the explosion-proof component (1) is provided with a notch (11), wherein the notch (11) comprises a bottom surface (111) and two side surfaces (112) connected to the bottom surface (111), wherein the two side surfaces (112) each comprise a first surface (1121), a step surface (1122) and a second surface (1123) connected in sequence along a depth direction, wherein the planes on which the two first surfaces (1121) are located each form an obtuse angle with the bottom surface (111), and the step surfaces (1122) are each arranged away from the bottom surface (111), and the notch (11) can be formed by two-step stamping.

2. The explosion-proof structure according to claim 1, characterized in that: Both of the two second surfaces (1123) form an obtuse angle with the bottom surface (111).

3. The explosion-proof structure according to claim 2, characterized in that: The obtuse angles formed by the planes where the two first surfaces (1121) are located and the bottom surface (111) are equal; and / or, the obtuse angles formed by the two second surfaces (1123) and the bottom surface (111) are equal; And / or, the obtuse angle formed by the plane where the first surface (1121) is located and the bottom surface (111) is equal to the obtuse angle formed by the second surface (1123) and the bottom surface (111).

4. The explosion-proof structure according to claim 1, characterized in that: The junctions between the end surface (12) of the explosion-proof component (1) where the notch (11) is formed and the two first surfaces (1121) are in smooth transition.

5. The explosion-proof structure according to any one of claims 1 to 4, characterized in that: There is a smooth transition between the step surface (1122) of one of the side surfaces (112) and the second surface (1123).

6. The explosion-proof structure according to any one of claims 1 to 4, characterized in that: Both of the two second surfaces (1123) transition smoothly with the bottom surface (111).

7. The explosion-proof structure according to any one of claims 1 to 4, characterized in that: The bottom surface (111) is parallel to the back surface (13) of the end surface (12) of the explosion-proof component (1) on which the notch (11) is formed.

8. The explosion-proof structure according to any one of claims 1 to 4, characterized in that: The notch (11) is a closed polygon, circle or ellipse, or the notch (11) is an open polygon, circle or ellipse.

9. A battery, characterized in that It comprises the explosion-proof structure according to any one of claims 1 to 8, wherein the explosion-proof structure is arranged on the housing of the battery.

10. The battery according to claim 9, characterized in that The explosion-proof component (1) is an end cover of the shell, or the explosion-proof structure is arranged on the end cover of the shell.

Images