Cover plate and secondary battery

Abstract

The utility model relates to a cover plate and a secondary battery, the cover plate comprises a main body, the lower part of the main body is provided with a guide part, the guide part comprises a guide surface and a bottom surface in a first direction, and the guide surface comprises an arc surface and an inclined surface in a second direction; the secondary battery comprises a battery body, the cover plate is adopted, the battery body further comprises a shell and a battery cell, the shell is of a cavity structure with an opening in the top, the battery cell is placed in the shell, the cover plate is buckled to the top of the shell and welded to the shell, and the bottom face right faces the top face of the battery cell. According to the utility model, the cover plate can be prevented from being scratched due to collision or friction between the cover plate and the shell wall of the shell, and even the short circuit of the battery core due to the fact that chippings fall into the shell can be prevented, so that the assembly difficulty of the battery is reduced, and the assembly efficiency and the production efficiency of the battery are improved.

Description

Technical Field

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

[0002] Secondary batteries have the advantages of high energy and power density, many cycles, long storage time, cleanliness and environmental protection. Therefore, they have been widely used in electronic devices such as digital cameras, computers, mobile phones, power tools, etc., and have broad application prospects in electric vehicles such as electric cars, electric bicycles, electric ships and even electric aircraft, as well as large and medium-sized equipment such as energy storage equipment.

[0003] The battery structure includes a shell and a cover. When the cover is connected to the shell, collision or friction between the cover and the shell wall may cause scratches on the cover, or even debris to fall inside the shell and cause a short circuit in the battery cell. This not only affects product quality and reduces product safety, but also increases the difficulty of battery assembly in production and reduces battery assembly efficiency and production efficiency.

[0004] During the battery manufacturing process, how to reduce the difficulty of battery assembly and improve battery assembly efficiency and production efficiency is a technical problem that needs to be solved urgently in battery technology. Summary of the Invention

[0005] The utility model aims to provide a cover plate and a secondary battery, which can solve the problem that when the cover plate is connected to the shell, collision or friction occurs between the cover plate and the shell wall, causing scratches on the cover plate, or even debris falling into the shell, causing a short circuit in the battery cell.

[0006] The purpose of the utility model is achieved as follows: a cover plate includes a main body, a guide portion is provided at the lower part of the main body, the guide portion includes a guide surface and a bottom surface in a first direction, and the guide surface includes an arc surface and an inclined surface in a second direction.

[0007] The bottom surface is parallel to the horizontal plane.

[0008] The arc surfaces and the inclined surfaces are distributed alternately.

[0009] The angle between the first direction and the second direction is 0°-90°.

[0010] The bottom of the main body is provided with an assembly portion, the guide portion is located at the lower part of the assembly portion, and the guide surface connects the peripheral side surface of the assembly portion and the bottom surface of the guide portion.

[0011] The assembly portion is fixedly connected to the bottom of the main body or is integrally formed.

[0012] The projection area of ​​the assembly portion is smaller than the projection area of ​​the main body.

[0013] A secondary battery comprises a battery body, adopts the cover plate, the battery body further comprises a shell and an electric core, the shell is a cavity structure with an open top, the electric core is placed inside the shell, the cover plate is buckled on the top of the shell and welded with the shell, and the bottom surface faces the top surface of the electric core.

[0014] The cover plate body of the device is provided with a guide portion, the guide portion comprises a guide surface and a bottom surface in a first direction, the guide surface is inclined relative to the bottom surface, and the guide surface comprises a circular arc surface and an inclined surface in a second direction, the circular arc surface and the inclined surface are staggered, the circular arc surface structure of the guide portion can reduce the contact surface between the top of the shell and the guide portion, thereby preventing the cover plate from being scratched due to collision or friction between the cover plate and the shell wall of the shell, and even preventing the electric core from being short-circuited due to debris falling into the shell, improving product quality and safety, and the device can reduce the assembly difficulty of the battery, improve the assembly efficiency and production efficiency of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the cover plate and the cover plate of the secondary battery of the utility model.

[0016] Figure 2 It is a main view structure diagram of the cover plate and the cover plate of the secondary battery of the utility model.

[0017] Figure 3 It is a cover plate and the cover plate of the secondary battery of the utility model. Figure 2 It is an enlarged view of A part.

[0018] Figure 4 It is a circular arc surface and inclined surface structure schematic view of the cover plate and the secondary battery of the utility model.

[0019] Figure 5 It is a secondary battery structure schematic view of the cover plate and the secondary battery of the utility model.

[0020] In the figure: 1, cover plate; 2, assembly part; 31, guide surface; 311, circular arc surface; 312, inclined surface; 32, bottom surface; 4, shell; 5, electric core. DETAILED DESCRIPTION

[0021] The utility model will be further described below in combination with the drawings. EMBODIMENT

[0022] As Figures 1-5 shown, a cover plate comprises a main body, the main body lower part is provided with a guide portion, the guide portion comprises a guide surface 31 and a bottom surface 32 in a first direction, the guide surface 31 comprises a circular arc surface 311 and an inclined surface 312 in a second direction.

[0023] The bottom surface 32 is parallel to the horizontal plane.

[0024] The arc surface 311 and the inclined surface 312 are arranged alternately.

[0025] The angle between the first direction and the second direction is 0°-90°.

[0026] The bottom of the main body is provided with an assembly portion 2 , the guide portion is located at the lower portion of the assembly portion 2 , and the guide surface 31 connects the peripheral side surface of the assembly portion 2 and the bottom surface 32 of the guide portion.

[0027] The assembly portion 2 is fixedly connected to the bottom of the main body or is integrally formed.

[0028] The projection area of ​​the assembly portion 2 is smaller than the projection area of ​​the main body.

[0029] A secondary battery includes a battery body, using the aforementioned cover plate 1, the battery body also including a shell 4 and a battery cell 5, the shell 4 is a cavity structure with an open top, the battery cell 5 is placed inside the shell 4, the cover plate 1 is buckled on the top of the shell 4 and welded to the shell 4, and the bottom surface 32 faces the top surface of the battery cell 5.

[0030] During use, the housing 4 of the present invention comprises a cavity structure with an open top. A battery cell 5 is placed within the housing 4, with the top surface of the battery cell 5 facing the open top of the housing 4. The cover plate 1 is snapped onto the top of the housing 4. After the cover plate 1 and the housing 4 are secured, the bottom surface 32 of the cover plate 1 faces the top surface of the battery cell 5. After the cover plate 1 and the housing 4 are welded, a sealed secondary battery structure is formed. To improve product quality, the cover plate 1 in this embodiment comprises a main body and a guide portion. The bottom of the main body is fixedly connected to or integrally formed with the assembly portion 2. The guide portion is located below the assembly portion 2 and includes a guide surface 31 and a bottom surface 32 extending in a first direction. The guide surface 31 is inclined relative to the bottom surface 32 and connects the bottom surface 32 of the guide portion (in this case, the bottom surface of the assembly portion 2 is also the bottom surface of the cover plate 1) and the peripheral side surface of the assembly portion 2. This utility model has the advantages of improving assembly accuracy and stability, enhancing structural strength and sealing, optimizing battery performance, and improving production efficiency. Example

[0031] like Figures 1-5 As shown, a cover plate includes a main body, a guide portion is provided at the lower part of the main body, the guide portion includes a guide surface 31 and a bottom surface 32 in a first direction, the guide surface 31 includes an arc surface 311 and an inclined surface 312 in a second direction.

[0032] For better effect, the bottom surface 32 is parallel to the horizontal plane.

[0033] For better effect, the arc surface 311 and the inclined surface 312 are staggered.

[0034] For better effect, the included angle between the first direction and the second direction is 0°-90°. The included angle is preferably 45°.

[0035] For better effect, the bottom of the main body is provided with a fitting part 2, the guide part is located at the lower part of the fitting part 2, and the guide surface 31 connects the circumferential surface of the fitting part 2 and the bottom surface 32 of the guide part.

[0036] For better effect, the fitting part 2 is fixedly connected with the bottom of the main body or is integrally formed.

[0037] For better effect, the projection area of the fitting part 2 is smaller than the projection area of the main body. It is ensured that the fitting part 2 does not interfere with the shell 4 or other components when the cover plate 1 is installed.

[0038] A secondary battery comprises a battery body adopting the aforementioned cover plate 1, wherein the battery body further comprises a shell 4 and a battery core 5, the shell 4 is a cavity structure with an open top, the battery core 5 is placed inside the shell 4, the cover plate 1 is buckled on the top of the shell 4 and is welded with the shell 4, and the bottom surface 32 is opposite to the top surface of the battery core 5.

[0039] In use, the shell 4 is a cavity structure with an open top, the battery core 5 is placed inside the shell 4, the top surface of the battery core 5 faces the top opening of the shell 4, the cover plate 1 is buckled on the top of the shell 4, the bottom surface 32 of the cover plate 1 is opposite to the top surface of the battery core 5 after the cover plate 1 is fixed with the shell 4, and the cover plate 1 is welded with the shell 4 to form a sealed secondary battery structure. In order to improve product quality, the cover plate 1 in the embodiment comprises a main body and a guide part, the bottom of the main body is fixedly connected or integrally formed with a fitting part 2, the guide part is located at the lower part of the fitting part 2, the guide part comprises a guide surface 31 and a bottom surface 32 in a first direction, the guide surface 31 is obliquely arranged relative to the bottom surface 32, and the guide surface 31 connects the bottom surface 32 of the guide part and the circumferential surface of the fitting part 2 (at this time, the bottom surface of the fitting part 2 is the bottom surface of the cover plate 1). The utility model has the characteristics of improving assembly precision and stability, enhancing structural strength and sealing performance, optimizing battery performance and improving production efficiency.

[0040] Further, the projection area of the fitting part 2 is smaller than the projection area of the main body, in specific installation, the edge position of the main body of the cover plate 1 abuts against the top surface of the shell 4, and then the cover plate 1 and the shell 4 are welded and fixed. Preferably, the bottom of the main body can not be provided with the fitting part 2, and the guide part is integrally formed at the lower part of the main body, which can further enhance the structural strength of the cover plate 1 and improve the overall durability and safety of the battery.

[0041] Further, in order to improve the energy density of the battery, the guide surface 31 comprises a circular arc surface 311 and a slope 312 in the second direction, the circular arc surface 311 and the slope 312 are staggered, and the slope 312 can reduce the overall weight of the cover plate 1, thereby improving the energy density of the entire battery. The staggered design also helps to provide accurate guidance when the cover plate 1 is combined with the secondary battery shell 4 or other assembly components. This not only simplifies the assembly process, but also reduces assembly errors and improves assembly accuracy.

[0042] Finally, it should be noted that the above is only the preferred embodiment of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified without creative labor, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cover plate, comprising a main body, characterized in that: A guide portion is provided at the lower portion of the main body, the guide portion includes a guide surface and a bottom surface in a first direction, the guide surface is inclined relative to the bottom surface, the guide surface includes an arc surface and an inclined surface in a second direction, and the arc surface and the inclined surface are staggered.

2. The cover plate according to claim 1, wherein: The bottom surface is parallel to the horizontal plane.

3. The cover plate according to claim 1, wherein: The bottom of the main body is provided with an assembly portion, the guide portion is located at the lower part of the assembly portion, and the guide surface connects the peripheral side surface of the assembly portion and the bottom surface of the guide portion.

4. The cover plate according to claim 3, wherein: The assembly portion is fixedly connected to the bottom of the main body or is integrally formed.

5. The cover plate according to claim 4, characterized in that: The projection area of ​​the assembly portion is smaller than the projection area of ​​the main body.

6. A secondary battery comprising a battery body, using the cover plate according to any one of claims 1 to 5, characterized in that: The battery body also includes a shell and a battery cell. The shell is a cavity structure with an open top. The battery cell is placed inside the shell. The cover is buckled on the top of the shell and welded to the shell. The bottom surface faces the top surface of the battery cell.

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