Button cell with high sealing performance

Abstract

The utility model relates to the field of button cells, and particularly discloses a high-sealing button cell which comprises a shell, an upper cover and a battery cell, the shell comprises a containing cavity, the battery cell is contained in the containing cavity, a limiting ring is arranged on the outer wall of the shell, and the limiting ring extends from the outer wall of the shell in the direction away from one side of the containing cavity. A limiting piece matched with the limiting ring in an embedded mode is arranged on the side wall of the upper cover, and the upper cover is buckled to the top of the shell through the connecting piece and the limiting piece. The limiting ring on the outer wall of the shell and the limiting piece on the side wall of the upper cover are matched in an embedded mode, a tighter closed structure is achieved, and under the effect of the arrangement of the limiting ring and the limiting piece, the orientation of a joint seam between the upper cover and the shell is opposite to the installation direction of the upper cover and is in a bent shape. And the risk that external liquid or gas permeates into the battery through the joint seam can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of button cell, especially a button cell with high sealing performance. BACKGROUND

[0002] Button cell, also known as coin cell or button-type battery, is a small battery. Button cell is widely used in various small electronic devices due to its small size, light weight, stable and reliable performance, etc.

[0003] The existing button cell with the patent application number 202321302924.8 includes a cup-shaped bottom container, a cover, and a sealing material applied to the outside of the cylindrical wall of the top cover cup during assembly. Then, the top cover cup is inserted into the bottom cup.

[0004] As mentioned above, the existing button cell usually has a joint between the shell and the upper cover that can penetrate into the battery interior. Only the joint is sealed by the sealing material, which still has a risk of penetration. Moreover, high temperature, high pressure, or humid environment can accelerate the aging of the sealing material, thereby reducing its sealing performance and safety. SUMMARY

[0005] The utility model provides a button cell with high sealing performance to solve the technical problem that the joint can penetrate into the battery interior and still has a risk of penetration in the prior art.

[0006] To solve the above problems, the button cell with high sealing performance provided by the utility model adopts the following technical scheme: it includes a shell, an upper cover, and a battery cell. The shell includes a receiving cavity, and the battery cell is received in the receiving cavity. A limiting ring is arranged on the outer wall of the shell and extends from the outer wall of the shell in a direction away from the receiving cavity. The side wall of the upper cover is provided with a limiting piece that is embedded and matched with the limiting ring. The upper cover is buckled on the top of the shell through a connecting piece and the limiting piece.

[0007] Further, a limiting block is arranged on one side of the limiting ring away from the upper cover. The cross section of the limiting ring and the limiting block is in L-shaped structure. A U-shaped groove is arranged on the limiting piece and embedded and matched with the limiting block.

[0008] Further, the end face of one side of the limiting block facing the limiting piece is an arc face, and the limiting piece is arranged in an arc structure matched with the limiting block.

[0009] Further, an insulating sealing ring is arranged on the shell at the opening thereof. The insulating sealing ring covers the outer wall, the top end face, and the inner wall of the shell. The outer periphery of the insulating sealing ring is transitionally matched with the inner periphery of the upper cover.

[0010] Further, a spring sheet is connected between the battery cell and the upper cover in abutting connection. The bottom end face of the battery cell is electrically connected with the shell, and the top end face of the battery cell is electrically connected with the upper cover through the spring sheet.

[0011] Further, the upper cover is made of insulating material, the upper cover is provided with a mounting hole corresponding to the opening of the shell, a first conductive part is arranged in the mounting hole, a second conductive part is arranged on the upper cover, the second conductive part covers the first conductive part, and the second conductive part is electrically connected with the first conductive part, and the electric core is connected with the upper cover through a spring sheet, and the electric core is electrically connected with the first conductive part through the spring sheet.

[0012] Further, the upper cover top end face is provided with a limiting groove, and the second conductive part is embeddedly matched with the upper cover through the limiting groove.

[0013] Further, the electric core comprises a positive electrode material, a diaphragm and a negative electrode material arranged in layers; or the electric core is a soft package electric core with a positive electrode lug and a negative electrode lug.

[0014] The beneficial effect of the high-sealing-performance button cell provided by the utility model is that the limiting ring of the shell outer wall and the limiting part of the upper cover side wall are embeddedly matched, a more tightly closed structure is realized, under the action of the limiting ring and the limiting part layout, the joint seam between the upper cover and the shell is opposite to the installation direction of the upper cover and is in a bent shape, the risk of external liquid or gas seeping into the battery interior through the joint seam can be effectively reduced, and the safety is higher. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements throughout. In the drawings:

[0016] Figure 1 FIG. 1 is a structure schematic view of an embodiment 1 of a high-sealing-performance button cell of the utility model;

[0017] Figure 2 FIG. 2 is a structure schematic view of an embodiment 2 of a high-sealing-performance button cell of the utility model.

[0018] BRIEF DESCRIPTION OF DRAWINGS

[0019] 1, shell; 11, accommodating cavity; 12, limiting ring; 121, limiting block;

[0020] 2, upper cover; 21, limiting part; 22, mounting hole; 221, first conductive part; 23, second conductive part; 231, limiting groove;

[0021] 3, electric core;

[0022] 4, insulating sealing ring;

[0023] 5, spring sheet. DETAILED DESCRIPTION

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0026] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0027] Example 1

[0028] This utility model provides a highly sealed button battery, such as Figure 1 As shown, the device includes a housing 1, a top cover 2, and a battery cell 3. The housing 1 includes a receiving cavity 11, in which the battery cell 3 is housed. A limiting ring 12 is provided on the outer wall of the housing 1, extending from the outer wall of the housing 1 in a direction away from the receiving cavity 11. A limiting member 21 is provided on the side wall of the top cover 2, which engages with the limiting ring 12. The top cover 2 is fastened to the top of the housing 1 by a connector and the limiting member 21.

[0029] By adopting the above technical solution, the limiting ring 12 on the outer wall of the housing 1 and the limiting member 21 on the side wall of the upper cover 2 fit together to achieve a tighter sealing structure. Under the effect of the arrangement of the limiting ring 12 and the limiting member 21, the orientation of the joint between the upper cover 2 and the housing 1 is opposite to the installation direction of the upper cover 2 and is bent, which can effectively reduce the risk of external liquids or gases seeping into the battery through the joint, resulting in higher safety.

[0030] In this embodiment, a limiting block 121 is provided on the side of the limiting ring 12 away from the upper cover 2. The limiting ring 12 and the limiting block 121 have an L-shaped cross-section. A U-shaped groove is provided on the limiting member 21, and the U-shaped groove fits into the limiting block 121. In this embodiment, the limiting ring 12 is mainly used to provide a stable reference surface so that the limiting block 121 fits into the limiting member 21 of the upper cover 2. The setting of the limiting block 121 can effectively enhance the connection stability between the limiting ring 12 and the limiting member 21, so that the upper cover 2 can be more firmly fixed when it is fastened to the top of the housing 1. When the upper cover 2 is fastened to the top of the housing 1, the limiting block 121 will be accurately embedded in the U-shaped groove to form a stable connection structure, which can further prevent external liquids, gases or dust from seeping into the battery through the joint seam, thereby improving the safety and reliability of the battery.

[0031] In the embodiment, the side end face of the limiting block 121 towards the limiting piece 21 is an arc face, and the limiting piece 21 is provided in an arc structure matched with the limiting block 121, so that the limiting block 121 is more smooth when embedded in the limiting piece 21, and the contact face after embedding is more closely fitted, which can effectively reduce the friction and resistance in the assembly process, thereby effectively reducing the assembly difficulty and improving the production efficiency, and the sealing performance after embedding is better.

[0032] In the embodiment, the limiting ring 12, the limiting block 121 and the limiting piece 21 are all provided in a ring structure.

[0033] In the embodiment, the insulating sealing ring 4 is provided on the shell 1 at the opening thereof, which provides a sealing function to prevent external liquid, gas or dust from entering the inside of the battery, and also provides an electrical isolation function to ensure that the shell 1 and the upper cover 2 are not electrically connected. In the embodiment, the insulating sealing ring 4 covers the outer wall, the top end face and the inner wall of the shell 1, and the outer periphery of the insulating sealing ring 4 is in transition fit with the inner periphery of the upper cover 2 to ensure the close contact between the insulating sealing ring 4 and the shell 1, which can effectively reduce the potential leakage path, and both ensures that the insulating sealing ring 4 can be firmly fixed between the shell 1 and the upper cover 2 and allows a certain elastic deformation during assembly to adapt to manufacturing tolerances and temperature changes.

[0034] In other embodiments, the insulating sealing ring 4 can be made of various materials such as rubber and silicone.

[0035] In the embodiment, the spring 5 is connected between the electric core 3 and the upper cover 2, the bottom end face of the electric core 3 is electrically connected with the shell 1, and the top end face of the electric core 3 is electrically connected with the upper cover 2 through the spring 5. The spring 5 has good electrical conductivity and elasticity, which can ensure the stability of the electrical connection between the electric core 3 and the upper cover 2, and the elastic deformation of the spring 5 can absorb the vibration and impact generated during use of the battery, thereby protecting the battery and the inside from damage.

[0036] In the embodiment, the electric core 3 includes a positive electrode material, a separator and a negative electrode material arranged in layers; or the electric core 3 is a soft package electric core 3 with positive and negative electrode tabs.

[0037] It should be noted that the electric core 3 is a prior art, and those skilled in the art should be clear about its structure, principle and use method, etc., which are not described in detail here.

[0038] Embodiment 2

[0039] As Figure 2As shown, different from example 1, in the present example, the upper cover 2 is made of insulating material, the upper cover 2 is provided with a mounting hole 22 corresponding to the opening of the shell 1, the first conductive part 221 is arranged in the mounting hole 22, the second conductive part 23 is arranged on the upper cover 2, the second conductive part 23 covers the first conductive part 221, and the second conductive part 23 is electrically connected with the first conductive part 221, and the elastic sheet 5 is arranged between the upper cover 2 and the electric core 3, and the electric core 3 is electrically connected with the first conductive part 221 through the elastic sheet 5.

[0040] In the present example, the upper cover 2 is made of insulating material, which can ensure the electrical safety of the battery during use, and the insulating material can effectively isolate the electrical elements inside the battery, prevent short circuit and electric shock, and other dangerous situations, so that the safety of the battery is higher.

[0041] It should be noted that in the present example, the area of the insulating sealing ring 4 covering the shell 1 is smaller than that in example 1. In other examples, the area of the insulating sealing ring 4 covering the shell 1 can be adjusted according to actual use requirements.

[0042] In the present example, the first conductive part 221 is electrically connected with the second conductive part 23, which ensures the electrical connection point between the battery and the external circuit, and the electric core 3 is electrically connected with the first conductive part 221 through the elastic sheet 5, which realizes the electrical connection inside the battery.

[0043] In the present example, the diameter of the second conductive part 23 is greater than that of the first conductive part 221, the vertical central axis of the first conductive part 221 and the vertical central axis of the second conductive part 23 coincide with each other, and the second conductive part 23 covers the first conductive part 221, which can effectively prevent external pollutants from entering. In other examples, the first conductive part 221 and the second conductive part 23 can be connected in various forms such as welding and plug-in, and a sealing ring can be installed in the mounting hole 22 to further ensure the sealing effect.

[0044] In the present example, the upper cover 2 is provided with a limiting groove 231 on the top end face, and the second conductive part 23 is embedded and matched with the upper cover 2 through the limiting groove 231, which can effectively increase the stability of the second conductive part 23 on the upper cover 2, and is not easy to move or fall off, and can reduce the error in the assembly process and improve the assembly precision.

[0045] According to the above description of the present specification, those skilled in the art can also understand that the terms used such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0046] In addition, in the description of the present specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A high-sealing button cell, characterized by, The shell includes a containing cavity, the electric core is contained in the containing cavity, a limiting ring is arranged on the outer wall of the shell and extends from the outer wall of the shell in the direction away from the containing cavity, a limiting member is arranged on the side wall of the upper cover and is embeddedly matched with the limiting ring, and the upper cover is buckled on the top of the shell through the connecting member and the limiting member.

2. The high sealing button cell battery of claim 1, wherein, A limiting block is arranged on the side of the limiting ring away from the upper cover, the cross section of the limiting ring and the limiting block is in L-shaped structure, a U-shaped groove is arranged on the limiting member and is embeddedly matched with the limiting block.

3. The high-hermeticity button cell of claim 2, wherein, The side end face of the limiting block towards the limiting member is in arc shape, and the limiting member is arranged in arc structure matched with the limiting block.

4. The high-hermeticity button cell of any one of claims 1 to 3, wherein, An insulating sealing ring is arranged on the shell at the opening thereof, the insulating sealing ring covers the outer wall, the top end face and the inner wall of the shell, and the outer periphery of the insulating sealing ring is transitionally matched with the inner periphery of the upper cover.

5. The high-hermeticity button cell of any one of claims 1 to 3, wherein, The electric core is connected with the upper cover by a spring, the bottom end face of the electric core is electrically connected with the shell, and the top end face of the electric core is electrically connected with the upper cover through the spring.

6. A high sealability button cell according to any one of claims 1 to 3, wherein The upper cover is made of insulating material, a mounting hole corresponding to the opening of the shell is arranged on the upper cover, a first conductive member is arranged in the mounting hole, a second conductive member is arranged on the upper cover, the second conductive member covers the first conductive member and is electrically connected with the first conductive member, the electric core is connected with the upper cover by a spring, and the electric core is electrically connected with the first conductive member through the spring.

7. The high-hermeticity button cell battery of claim 6, wherein, A limiting groove is arranged on the top end face of the upper cover, and the second conductive member is embeddedly matched with the upper cover through the limiting groove.

8. The high-hermeticity button cell of any one of claims 1 to 3, wherein, The electric core includes a positive electrode material, a diaphragm and a negative electrode material arranged in layers, or the electric core is a soft package electric core with a positive electrode tab and a negative electrode tab.

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