Protective cover plate and battery

Abstract

The protective cover plate comprises a cover body, an explosion-proof valve is arranged in the cover body, the protective cover plate further comprises a plurality of protective covers, the protective covers are arranged in the circumferential direction of the explosion-proof valve in a covering mode layer by layer, the protective covers are respectively connected with the cover body, an interval inner cavity is formed between every two adjacent protective covers, and the interval inner cavities are communicated with the explosion-proof valve. And each protective cover is provided with a plurality of air vents. According to the utility model, the protection effect of the position of the explosion-proof valve of the protection cover plate is improved, and the safety performance of the whole battery is further improved.

Description

Technical Field

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

[0002] Lithium-ion power batteries have been widely used in new energy vehicles and related fields due to their environmentally friendly properties and excellent charge and discharge characteristics. When a battery experiences extreme operating conditions such as thermal runaway due to improper use, the explosion-proof valve on the cover plate on top of the battery cell opens to release pressure. When substances inside the battery react violently, solid torn materials and molten plastic residue from the battery cell are ejected. If these high-temperature residues and other substances cannot be intercepted, they may become ignition points when they reach the battery module, posing an uncontrollable risk of fire and explosion. Therefore, it is necessary to design a protective cover plate to improve battery safety. Utility Model Content

[0003] The purpose of this utility model is to solve the above technical problems and provide a protective cover and a battery, thereby effectively preventing the ejection of substances inside the battery, improving the protective effect of the explosion-proof valve position of the protective cover, and thus improving the safety performance of the entire battery. In order to achieve the above purpose, the technical solution of this utility model is as follows:

[0004] The protective cover plate includes a cover body, an explosion-proof valve is arranged in the cover body, and the protective cover plate also includes a plurality of protective covers, which are arranged layer by layer on the circumference of the explosion-proof valve. Each of the protective covers is connected to the cover body, and an interval cavity is formed between adjacent protective covers. Each of the protective covers is provided with a plurality of vents.

[0005] Several protective covers can effectively block the internal materials of the battery cells ejected by the explosion-proof valve, play a multi-layer blocking role, and greatly improve the protective function of the protective cover.

[0006] Specifically, the protective cover includes a first protective cover and a second protective cover, the first protective cover is arranged outside the explosion-proof valve, and the second protective cover is arranged outside the first protective cover.

[0007] Each protective cover is connected to the cover body respectively to ensure that the connection between the protective cover and the cover body is stable, and a connection reinforcement structure is formed at the circumferential position of the explosion-proof valve.

[0008] Specifically, the first protective cover includes a first cover body and a first fixing frame arranged at the bottom of the first cover body, and a first vent is provided in the first cover body.

[0009] The first vent serves to effectively relieve pressure, and the first protective cover forms a first layer of blocking structure.

[0010] Specifically, the first cover body includes a first top wall and a first side wall arranged at the bottom of the first top wall, the bottom of the first side wall is connected to the first fixing frame, and the bottom surface of the first fixing frame is connected to the surface of the cover body.

[0011] The first fixing frame is stably connected to the cover body.

[0012] Specifically, the first top wall and / or the first side wall are provided with first vents, and the first vents are arranged in an array.

[0013] The first vents may be provided at positions including the first top wall and / or the first side wall, and the arrangement of the first vents is more flexible.

[0014] Specifically, the second protective cover includes a second cover body and a second fixing frame arranged at the bottom of the second cover body, and a second vent is provided in the second cover body.

[0015] The second vent serves to effectively relieve pressure, and the second protective cover forms a second layer of blocking structure.

[0016] Specifically, the second cover body includes a second top wall and a second side wall arranged at the bottom of the second top wall, the bottom of the second side wall is connected to the second fixing frame, and the bottom surface of the second fixing frame is connected to the surface of the cover body.

[0017] The second fixing frame is stably connected to the cover body.

[0018] Specifically, a frame groove is provided on the bottom surface of the second fixing frame, the outer periphery of the first fixing frame is positioned in the frame groove, and the bottom surface of the first fixing frame is flush with the bottom surface of the second fixing frame.

[0019] The first fixing frame is connected and matched with the second fixing frame to enhance the strength of the connection.

[0020] Specifically, the second top wall and / or the second side wall is provided with the second vent, and the aperture of the second vent located in the second top wall is smaller than the aperture of the first vent located in the first top wall.

[0021] The second vent in the second top wall can effectively block the sprayed matter that is not intercepted by the first vent in the first top wall, further improving the interception effect.

[0022] A battery comprising the protective cover.

[0023] Compared with the prior art, the protective cover and battery of the present invention have the following beneficial effects:

[0024] By setting up a number of protective covers respectively covering the circumference of the explosion-proof valve, each protective cover is connected to the cover body respectively to ensure that the connection between the protective cover and the cover body is stable, and a connection reinforcement structure is formed at the circumferential position of the explosion-proof valve. On the one hand, the strength of the outlet position of the explosion-proof valve is strengthened to avoid the unstable opening pressure of the explosion-proof valve due to insufficient strength of the circumferential position of the explosion-proof valve. On the other hand, when the explosion-proof valve reaches the opening pressure, the several protective covers can effectively block the internal substances of the battery cell ejected by the explosion-proof valve, play a multi-layer blocking role, and greatly improve the protection function of the protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a protective cover provided in an embodiment of the present application;

[0026] Figure 2 An exploded schematic diagram of the protective cover provided in an embodiment of the present application;

[0027] Figure 3 A schematic top view of a protective cover provided in an embodiment of the present application;

[0028] Figure 4 Schematic cross-sectional views of several protective covers provided in embodiments of the present application;

[0029] Figure 5 A schematic structural diagram of a first protective cover provided in an embodiment of the present application;

[0030] Figure 6 A schematic structural diagram of a second protective cover provided in an embodiment of the present application;

[0031] Figure 7 A schematic structural diagram of another protective cover provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] Cover body 1, explosion-proof valve 11, liquid injection hole 12;

[0034] First protective cover 2, first cover body 21, first top wall 211, first side wall 212, first fixing frame 22, first vent 23;

[0035] The second protective cover 3, the second cover body 31, the second top wall 311, the second side wall 312, the second fixing frame 32, the second vent 33, and the frame groove 34;

[0036] The inner cavity 4 is spaced apart. DETAILED DESCRIPTION

[0037] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0038] Example 1

[0039] This embodiment provides a protective cover, comprising a cover body 1, within which is disposed an explosion-proof valve 11. This valve 11 is a safety pressure relief device. When the pressure inside the battery becomes excessive, the valve 11 releases the pressure. During this pressure release, the contents of the battery may be ejected, posing a safety hazard. Therefore, a protective cover is designed to intercept the contents of the battery ejected from the valve 11 at its outlet, thereby providing a safety barrier.

[0040] Figure 1 A schematic structural diagram of a protective cover provided in an embodiment of the present application; Figure 2 An exploded schematic diagram of the protective cover provided in an embodiment of the present application; Figure 3 A schematic top view of a protective cover provided in an embodiment of the present application; Figure 4 Schematic cross-sectional views of several protective covers provided in embodiments of the present application.

[0041] like Figure 1-Figure 4 As shown, this embodiment provides a protective cover plate, and a plurality of protective covers are arranged on the cover body 1. The plurality of protective covers are arranged layer by layer on the circumference of the explosion-proof valve 11. Each protective cover is connected to the cover body 1 respectively, and an interval cavity 4 is formed between adjacent protective covers. Each protective cover is provided with a plurality of vents.

[0042] The bottoms of adjacent protective covers are connected, thereby increasing the connection strength between the adjacent protective covers and maintaining the connection stability between the protective covers and the cover body 1 .

[0043] The number of protective covers provided in this embodiment is two, specifically a first protective cover 2 and a second protective cover 3. The first protective cover 2 is closer to the explosion-proof valve 11 than the second protective cover 3. The first protective cover 2 is arranged outside the explosion-proof valve 11, and the second protective cover 3 is arranged outside the first protective cover 2. The first protective cover 2 forms a first protective blocking structure located at the outlet position of the explosion-proof valve 11, and the second protective cover 3 forms a second protective blocking structure located at the outlet position of the explosion-proof valve 11. The first protective cover 2 and the second protective cover 3 can effectively block most of the internal substances of the battery ejected by the explosion-proof valve 11, thereby achieving a dual-effect protective effect, enhancing the protective function of the protective cover, and thereby improving the safety performance of the overall battery.

[0044] In this embodiment, a number of protective covers are respectively provided to cover the circumference of the explosion-proof valve 11, and each protective cover is connected to the cover body 1 respectively to ensure that the connection between the protective cover and the cover body 1 is stable, and a connection reinforcement structure is formed at the circumferential position of the explosion-proof valve 11. On the one hand, the strength of the outlet position of the explosion-proof valve 11 is strengthened to avoid the unstable opening pressure of the explosion-proof valve 11 due to insufficient strength at the circumferential position. On the other hand, when the explosion-proof valve 11 reaches the opening pressure, the several protective covers can effectively block the internal substances of the battery cell ejected by the explosion-proof valve 11, play a multi-layer blocking role, and greatly improve the protective function of the protective cover.

[0045] Example 2

[0046] This embodiment optimizes the protective cover on the basis of the above embodiment, and in particular provides a specific implementation method of the cover:

[0047] An explosion-proof valve 11 is provided in the cover 1 , a positive terminal and a negative terminal are provided on both sides of the cover 1 , a stop frame is provided at the bottom of the cover 1 , and the explosion-proof valve 11 is located between the positive terminal and the negative terminal.

[0048] Figure 1 A schematic structural diagram of a protective cover provided in an embodiment of the present application; Figure 2 A schematic diagram of an exploded view of the protective cover provided in an embodiment of the present application.

[0049] like Figure 1 、 Figure 2 As shown, the cover body 1 can be a rectangular plate structure, a square structure or an irregular plate structure. In this embodiment, the cover body 1 is a rectangular plate structure. An explosion-proof valve 11 and an injection hole 12 are provided in the middle of the cover body 1. Several protective covers are provided on the outside of the explosion-proof valve 11 and the injection hole 12 without interfering with the explosion-proof valve 11 and the injection hole 12.

[0050] Example 3

[0051] This embodiment optimizes the protective cover on the basis of the above embodiment, and in particular provides a specific implementation of the first protective cover:

[0052] Figure 1 A schematic structural diagram of a protective cover provided in an embodiment of the present application; Figure 5 A schematic structural diagram of the first protective cover provided in an embodiment of the present application.

[0053] like Figure 1 、 Figure 5 As shown, the first protective cover 2 includes a first cover body 21 and a first fixing frame 22 provided at the bottom of the first cover body 21 , and the vent includes a first vent 23 provided in the first cover body 21 .

[0054] The first cover body 21 includes a first top wall 211 and a first side wall 212 disposed at the bottom of the first top wall 211 . The first side wall 212 is circumferentially connected to the first fixing frame 22 .

[0055] The first top wall 211 can be flat, curved, or irregularly shaped. In this embodiment, the first top wall 211 is flat, while the first side wall 212 is formed by a plurality of side panels, with adjacent side panels connected at rounded corners. In this embodiment, the first side wall 212 is formed by four side panels. The first top wall 211 and the first side wall 212 together form a first trough, which is used to block the internal contents of the battery cell from being ejected from the explosion-proof valve 11.

[0056] The bottom of the first side wall 212 is connected to the first fixed frame 22, and the bottom surface of the first fixed frame 22 is in contact with the surface of the cover body 1, thereby improving the connection stability and flatness of the first fixed frame 22 and the cover body 1; the first fixed frame 22 can be a rectangular frame structure, a circular ring structure or an irregular shape, and the inner periphery of the first fixed frame 22 corresponds to the outer periphery of the first side wall 212. In this embodiment, the first fixed frame 22 is a rectangular frame structure, and the bottom surface of the first fixed frame 22 is a plane.

[0057] The first fixing frame 22 and the cover 1 can be fixed by welding, so that the first fixing frame 22 and the cover 1 meet a certain connection strength. The first protective cover 2 can be made of steel, which is easy to weld to the cover 1.

[0058] The first top wall 211 and / or the first side wall 212 are provided with first vents 23, which are arranged in an array. The first vents 23 can be circular holes, square holes, elliptical holes or irregular hole structures. In this embodiment, the first vents 23 are circular holes.

[0059] The diameter of the first vents 23 in the first top wall 211 can be the same as or different from the diameter of the first vents 23 in the first side wall 212. The number of first vents 23 in the first top wall 211 can be the same as or different from the number of first vents 23 in the first side wall 212. The first vents 23 function to release gas from the battery. Properly arranging the number of first vents 23 allows for rapid pressure relief. Properly arranging the diameters of the first vents 23 effectively acts as a first layer to block the contents of the battery cells from being ejected by the explosion-proof valve 11.

[0060] Example 4

[0061] This embodiment optimizes the protective cover on the basis of the above embodiment, and in particular provides a specific implementation of the second protective cover:

[0062] Figure 1 A schematic structural diagram of a protective cover provided in an embodiment of the present application; Figure 5A schematic structural diagram of a first protective cover provided in an embodiment of the present application; Figure 6 A schematic structural diagram of the second protective cover provided in an embodiment of the present application.

[0063] like Figure 1 、 Figure 5 、 Figure 6 As shown, the second protective cover 3 includes a second cover body 31 and a second fixing frame 32 arranged at the bottom of the second cover body 31 , and the plurality of vents further includes a second vent 33 arranged in the second cover body 31 .

[0064] The second cover body 31 includes a second top wall 311 and a second side wall 312 disposed at the bottom of the second top wall 311 . The second side wall 312 is circumferentially connected to the second fixing frame 32 .

[0065] The second top wall 311 can be flat, curved, or irregularly shaped. In this embodiment, the second top wall 311 is flat, while the second side walls 312 are formed by a plurality of side panels. In this embodiment, the second side walls 312 include four side panels. Together, the second top wall 311 and the second side walls 312 form a second trough, which is used to block the contents of the battery cells from being ejected from the explosion-proof valve 11.

[0066] A second fixing frame 32 is provided at the bottom of the second sidewall 312. The bottom surface of the second fixing frame 32 is in contact with the surface of the cover body 1, improving the stability of the connection between the second fixing frame 32 and the cover body 1. The second fixing frame 32 can be a rectangular frame structure, a circular ring structure, or an irregular shape. The second fixing frame 32 and the first fixing frame 22 have similar structures. In this embodiment, the second fixing frame 32 is a rectangular frame structure. The bottom surface of the second fixing frame 32 is provided with a frame groove 34. The outer periphery of the first fixing frame 22 is positioned within the frame groove 34. The bottom surface of the first fixing frame 22 is flush with the bottom surface of the second fixing frame 32. The inner circumference of the second fixing frame 32 is not less than the outer circumference of the first cover body 21, so that the second fixing frame 32 can be accurately pressed against the circumferential position of the first fixing frame 22.

[0067] The second fixing frame 32 and the cover 1 can be secured by welding, ensuring a certain connection strength between the second fixing frame 32 and the cover 1. The second fixing frame 32 and the first fixing frame 22 can also be secured by welding, further enhancing the connection stability between the first fixing frame 22, the second fixing frame 32, and the cover 1. The second protective cover 3 can be made of aluminum alloy, facilitating welding to the cover 1.

[0068] The second top wall 311 and / or the second side wall 312 are provided with second vents 33, which can be arranged in an orderly or disorderly manner. The second vents 33 can be circular holes, square holes, elliptical holes or irregular hole structures. In this embodiment, the second vents 33 are square holes.

[0069] The diameter of the second vents 33 in the second top wall 311 can be the same as or different from the diameter of the second vents 33 in the second side wall 312. The number of second vents 33 in the second top wall 311 can be the same as or different from the number of second vents 33 in the second side wall 312. The second vents 33 function to release gas from the battery. Properly arranging the number of second vents 33 allows for rapid pressure relief. Properly arranging the diameters of the second vents 33 also provides a second layer of effective barrier against ejected material from the battery.

[0070] In this embodiment, the second side wall 312 includes four side panels, each of which is provided with two adjacently spaced second air vents 33. Eight second air vents 33 are provided in the second side wall 312. The air pressure released from the explosion-proof valve 11 can be quickly released from the second side wall 312. The aperture of the second air vent 33 in the second top wall 311 is smaller than the aperture of the second air vent 33 in the second side wall 312. The second top wall 311, which is located opposite to the outlet of the explosion-proof valve 11, plays a greater role in blocking the ejected internal substances of the battery cell. The smaller aperture of the second air vent 33 in the second top wall 311 is conducive to achieving a further blocking effect; the larger aperture of the second air vent 33 located in the second side wall 312 is conducive to achieving rapid pressure relief.

[0071] Figure 7 A schematic structural diagram of another protective cover provided in an embodiment of the present application.

[0072] In another embodiment, Figure 7 As shown, the second top wall 311 does not have the second vent 33, but the second side wall 312 is provided with a second vent 33. Specifically, the second side wall 312 includes four side panels, each of which is provided with a second vent 33, and the second side wall 312 is provided with four second vents 33. The second top wall 311 serves to block the ejected material from the battery cell, while the second vents 33 in the second side wall 312 serve to release pressure and exhaust.

[0073] In this embodiment, the aperture of the second vent 33 located in the second top wall 311 is smaller than the aperture of the first vent 23 located in the first top wall 211. The second top wall 311 serves as a second layer of protection structure, which can effectively block the internal materials of the battery cell from being ejected from the first vent 23.

[0074] Example 5

[0075] This embodiment provides a battery, including the protective cover 1 in the above embodiment. The protective cover 1 is provided with a plurality of protective shields, which enhance the blocking effect on the sprayed material of the explosion-proof valve 11 and improve the safety of the entire battery.

[0076] The battery further includes an outer shell (not shown in the figure), the opening of the outer shell is connected to the protective cover 1, and the outer shell and the protective cover 1 are assembled into a battery. This embodiment does not impose any specific restrictions on the outer shell.

[0077] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0079] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0080] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0081] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A protective cover plate, comprising a cover body, wherein an explosion-proof valve is provided in the cover body, characterized in that: It also includes a plurality of protective covers, which are arranged layer by layer around the explosion-proof valve. Each protective cover is connected to the cover body respectively, and an interval cavity is formed between adjacent protective covers. Each protective cover is provided with a plurality of vents.

2. The protective cover according to claim 1, wherein: The protective cover includes a first protective cover and a second protective cover. The first protective cover is arranged outside the explosion-proof valve, and the second protective cover is arranged outside the first protective cover.

3. The protective cover according to claim 2, wherein: The first protective cover includes a first cover body and a first fixing frame arranged at the bottom of the first cover body. A first vent is provided in the first cover body.

4. The protective cover according to claim 3, wherein: The first cover body includes a first top wall and a first side wall arranged at the bottom of the first top wall. The bottom of the first side wall is connected to the first fixing frame, and the bottom surface of the first fixing frame is connected to the surface of the cover body.

5. The protective cover according to claim 4, wherein: The first top wall and / or the first side wall are provided with the first vents, and the first vents are arranged in an array.

6. The protective cover according to claim 5, characterized in that: The second protective cover includes a second cover body and a second fixing frame arranged at the bottom of the second cover body. A second vent is provided in the second cover body.

7. The protective cover according to claim 6, wherein: The second cover body includes a second top wall and a second side wall arranged at the bottom of the second top wall. The bottom of the second side wall is connected to the second fixing frame, and the bottom surface of the second fixing frame is connected to the surface of the cover body.

8. The protective cover according to claim 6, wherein: A frame groove is provided on the bottom surface of the second fixing frame, the outer periphery of the first fixing frame is positioned in the frame groove, and the bottom surface of the first fixing frame is flush with the bottom surface of the second fixing frame.

9. The protective cover according to claim 7, wherein: The second top wall and / or the second side wall is provided with the second vent, and the aperture of the second vent located in the second top wall is smaller than the aperture of the first vent located in the first top wall.

10. A battery, characterized in that: The protective cover comprises the protective cover according to any one of claims 1 to 9.

Images