A button cell

Abstract

The utility model relates to the field of button cell, specifically disclose a button cell, including shell, with the shell cover, set up in the cavity of shell and shell cover form's electric core, the annular sealing ring of shell is embedded with, the bottom of sealing ring extends to form the fixed section of tubular, the fixed section fixedly connected with extension, the electric core is sleeved in the extension inside, and the outer wall of electric core and the inner wall of extension interference fit, the fixed section and the outer wall between extension form annular mounting groove, the notch of mounting groove is towards the shell cover, and the edge of shell cover extends to form the fixed part of ring, and the fixed part is the elastic clamping spring structure, and is embedded in the mounting groove, the bottom end face of fixed part, both sides elastic arm abuts on the horizontal groove bottom and vertical groove wall of mounting groove respectively to form radial and axial two -way locking, can effectively prevent electric core radial displacement in the battery use process, and can make shell and shell cover close combination, effectively prevent battery internal material leakage.

Description

Technical Field

[0001] This utility model relates to the field of button batteries, and in particular to a button battery. Background Technology

[0002] Button batteries are widely used in medical devices, smart wearable devices, and microelectronic devices due to their small size and high energy density.

[0003] The existing button battery, with patent publication number CN214672769U, includes a bottom shell, a cell, and a top cover. The bottom shell has an inner cavity, the cell is placed in the inner cavity, and the cell has a first tab and a second tab. The second tab is connected to the bottom shell, and the top cover is connected to the first tab.

[0004] As mentioned above, in existing button batteries, the positive and negative tabs of the cell usually elastically abut against the cover and outer casing. However, the sidewalls of the cell are usually not fixed, which makes the fixation between the cell and the casing not stable enough. When subjected to external impact or vibration, the cell is prone to displacement, affecting the performance and safety of the battery. Utility Model Content

[0005] This invention provides a button cell battery to solve the technical problem of cell displacement in the prior art.

[0006] To solve the above problems, the present invention provides a button battery with the following technical solution: It includes a casing, a cover that snaps onto the casing, and a battery cell disposed within the cavity formed by the casing and the cover. An annular sealing ring is embedded inside the casing. The bottom of the sealing ring extends downward to form a cylindrical fixing section. An extension is fixedly connected to the fixing section. The battery cell is fitted inside the extension, and the outer wall of the battery cell is interference-fitted with the inner wall of the extension. An annular mounting groove is formed between the fixing section and the outer wall of the extension. The opening of the mounting groove faces the cover. The edge of the cover extends downward to form an annular fixing part. The fixing part is an elastic spring structure and is embedded in the mounting groove. The bottom end face and two elastic arms of the fixing part abut against the horizontal bottom and vertical wall of the mounting groove, respectively, to form a radial and axial bidirectional locking structure.

[0007] Furthermore, the inner wall of the extension is provided with annular ribs, and the outer wall of the battery cell is in interference contact with the annular ribs.

[0008] Furthermore, the bottom of the sealing ring is provided with a positioning protrusion, and the corresponding position inside the outer shell is provided with a positioning groove, the positioning protrusion and the positioning groove cooperating with each other.

[0009] Furthermore, the outer side of the fixed section is provided with serrated anti-slip texture, and the inner wall of the outer shell is coated with an epoxy resin adhesive layer, the serrated anti-slip texture being compatible with the epoxy resin adhesive layer.

[0010] Furthermore, the fixing part is an open annular retaining spring, the open end of the fixing part is provided with an outward chamfer, and the top of the extension part is provided with a chamfer on the side facing the fixing part.

[0011] Furthermore, an annular pressure relief groove is provided on the bottom end face of the inner wall of the outer shell, and the bottom wall thickness of the pressure relief groove is 30%-40% of the outer shell wall thickness.

[0012] Furthermore, the surface of the pressure relief groove is covered with a tearable sealing film, the surface of which has a cross-shaped tear line, and the edge of the sealing film is bonded to the inner wall of the outer shell.

[0013] Furthermore, the pressure relief groove has a trapezoidal cross-section, and a silicone rubber buffer layer is provided at the bottom of the groove.

[0014] Furthermore, the walls of the pressure relief tank are inclined, with the inner wall inclination angle α = 65° ± 2° and the outer wall inclination angle β = 40° ± 2°.

[0015] Furthermore, the outer surface of the shell is provided with anti-slip texture, which is a wave-shaped texture evenly distributed along the circumference of the shell.

[0016] The beneficial effects of the button battery provided by this utility model are:

[0017] 1. The battery cell is installed inside the extension and the outer wall of the battery cell is interference-fitted with the inner wall of the extension. This design makes the battery cell constrained in the radial direction by the extension, which can effectively prevent the battery cell from radially displacing during battery use.

[0018] 2. The fixing part is embedded in the mounting groove and forms a radial and axial bidirectional locking, which can make the outer shell and the cover tightly connected, effectively preventing the leakage of internal battery materials, while improving the battery's moisture-proof and dust-proof capabilities and extending the battery's service life.

[0019] 3. A series of designs, including pressure relief grooves, tearable sealing membranes, trapezoidal structures, silicone rubber buffer layers, and inclined groove walls, form a complete pressure relief system. This system can release pressure in a timely and effective manner when the internal pressure of the battery rises abnormally, preventing battery explosion and improving battery safety. Attached Figure Description

[0020] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of a button battery according to the present invention;

[0022] Figure 2 for Figure 1 A magnified view of the structure at point A in the middle;

[0023] Figure 3 This is a schematic diagram of the sealing ring structure of a button battery according to the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Battery cell;

[0026] 2. Outer shell; 21. Positioning groove; 22. Epoxy resin adhesive layer; 23. Pressure relief groove; 231. Sealing membrane; 232. Buffer layer; 24. Anti-slip texture;

[0027] 3. Shell cover; 31. Fixing part;

[0028] 4. Sealing ring; 41. Fixing section; 411. Serrated anti-slip texture; 42. Extension; 421. Annular rib; 43. Positioning protrusion; 44. Mounting groove. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0032] The present invention provides a button battery, such as Figures 1 to 3 As shown, it includes a housing 2, a cover 3 that snaps onto the housing 2, and a battery cell 1 disposed in the cavity formed by the housing 2 and the cover 3.

[0033] In this embodiment, an annular sealing ring 4 is embedded inside the outer casing 2. The bottom of the sealing ring 4 extends downward to form a cylindrical fixing section 41. The fixing section 41 is fixedly connected to an extension 42. The battery cell 1 is fitted inside the extension 42, and the outer wall of the battery cell 1 is interference-fitted with the inner wall of the extension 42. This ensures that the battery cell 1 is firmly fixed inside the extension 42, preventing displacement of the battery cell 1 in the radial and axial directions. This effectively solves the displacement problem that may occur during battery use and ensures the stability of battery performance. In this embodiment, the inner wall of the extension 42 is provided with an annular rib 421, and the outer wall of the battery cell 1 is in interference contact with the annular rib 421, which further ensures the stability of the battery cell 1.

[0034] In this embodiment, the bottom of the sealing ring 4 is provided with a positioning protrusion 43, and the corresponding position inside the outer shell 2 is provided with a positioning groove 21. The positioning protrusion 43 and the positioning groove 21 cooperate to achieve rapid and accurate positioning of the sealing ring 4 and the outer shell 2, improving assembly efficiency and quality, and ensuring the relative positional accuracy between the components. In this embodiment, the outer side of the fixing section 41 is provided with a serrated anti-slip texture 411, and the corresponding position on the inner wall of the outer shell 2 is coated with an epoxy resin adhesive layer 22. The serrated anti-slip texture 411 and the epoxy resin adhesive layer 22 are compatible. In this embodiment, the serrated anti-slip texture 411 and the epoxy resin adhesive layer 22 interact to effectively enhance the connection stability between the sealing ring 4 and the outer shell 2.

[0035] In this embodiment, an annular mounting groove 44 is formed between the outer wall of the fixing section 41 and the extension 42. The groove opening of the mounting groove 44 faces the cover 3. The edge of the cover 3 extends downward to form an annular fixing part 31. The fixing part 31 is an elastic snap spring structure. The fixing part 31 is embedded in the mounting groove 44. The bottom end face and the elastic arms on both sides of the fixing part 31 abut against the horizontal groove bottom and the vertical groove wall of the mounting groove 44, respectively, to form a radial and axial bidirectional locking structure, so that the outer shell 2 and the cover 3 are tightly connected, which can effectively prevent the leakage of internal battery materials and improve the battery's moisture-proof and dust-proof capabilities.

[0036] In this embodiment, the fixing part 31 is an open annular retaining spring with an outward chamfer at its open end. The top of the extension part 42 is chamfered on the side facing the fixing part 31, which facilitates the fixing part 31 to be smoothly inserted into the mounting groove 44 and can effectively reduce the assembly difficulty.

[0037] In this embodiment, an annular pressure relief groove 23 is formed on the bottom end face of the inner wall of the outer casing 2. The bottom wall thickness of the pressure relief groove 23 is 30%-40% of the wall thickness of the outer casing 2. The pressure relief groove 23 can provide a pressure release channel when the internal pressure of the battery rises abnormally, thus preventing the battery from exploding. The surface of the pressure relief groove 23 is covered with a tearable sealing film 231. The surface of the sealing film 231 has a cross-shaped tear line. The edge of the sealing film 231 is bonded to the inner wall of the outer casing 2. Under normal conditions, the sealing film 231 prevents leakage. When the pressure rises, it tears in a predetermined direction to ensure that the pressure relief channel is unobstructed.

[0038] In this embodiment, the sealing film 231 is a three-layer composite structure of polyimide, aluminum foil, and polyethylene, wherein the thickness of the aluminum foil layer accounts for 30% of the total thickness of the composite structure.

[0039] In this embodiment, the cross-section of the pressure relief groove 23 is trapezoidal, and a silicone rubber buffer layer 232 is provided at the bottom of the pressure relief groove 23. The buffer layer 232 can buffer the pressure relief impact force and reduce damage to other components of the battery.

[0040] In this embodiment, the walls of the pressure relief groove 23 are inclined, with an inner wall inclination angle α = 65° ± 2° and an outer wall inclination angle β = 40° ± 2°. This helps to release pressure evenly and avoid excessive local pressure that could damage the battery. Furthermore, the 65° ± 2° inclination angle of the inner wall ensures that the impact force generated during the burst is decomposed into horizontal and vertical components upon contact with the inner wall. The horizontal component helps to guide the pressure laterally toward the battery, preventing pressure from concentrating in a localized area and reducing direct impact on critical internal components of the battery.

[0041] In this embodiment, the outer surface of the outer shell 2 is provided with anti-slip texture 24. The anti-slip texture 24 is a wave-shaped texture evenly distributed along the circumference of the outer shell 2, which can increase the friction when the user holds the battery and facilitate operation.

[0042] It should be noted that the battery cell 1 is existing technology. The battery cell 1 is housed in the outer casing 2. The battery cell 1 includes the battery cell 1 body, positive electrode tab, and negative electrode tab. The positive electrode tab and negative electrode tab are respectively led out from the two ends of the axial direction of the battery cell 1 body. The positive electrode tab abuts against the casing 3, and the negative electrode tab abuts against the outer casing 2. Those skilled in the art should be clear about its structure, principle and usage, etc., and will not be described in detail here.

[0043] The button battery provided by this utility model has a fixed and secure cell 1, which can prevent displacement, ensure stable battery performance output, and extend battery life. In addition, the outer shell 2 and the cover 3 have a good sealing performance, which can effectively prevent internal material leakage and enhance moisture and dust resistance. At the same time, the perfect pressure relief mechanism can release pressure in time when the internal pressure of the battery is abnormal, avoid explosion accidents, and ensure user safety.

[0044] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0045] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A button battery, characterized in that, The device includes an outer casing, a cover that snaps onto the outer casing, and a battery cell housed within the cavity formed by the outer casing and the cover. An annular sealing ring is embedded within the outer casing, and the bottom of the sealing ring extends downwards to form a cylindrical fixing section. An extension is fixedly connected to the fixing section, and the battery cell is fitted inside the extension, with the outer wall of the battery cell and the inner wall of the extension being press-fitted. An annular mounting groove is formed between the fixing section and the outer wall of the extension, with the groove opening facing the cover. The edge of the cover extends downwards to form an annular fixing part, which is a spring-loaded elastic structure embedded within the mounting groove. The bottom end face and two elastic arms of the fixing part abut against the horizontal bottom and vertical wall of the mounting groove, respectively, to form a radial and axial bidirectional locking structure.

2. A button battery according to claim 1, characterized in that, The inner wall of the extension is provided with annular ribs, and the outer wall of the battery cell is in interference contact with the annular ribs.

3. A button battery according to claim 1, characterized in that, The bottom of the sealing ring has a positioning protrusion, and the inside of the outer shell has a positioning groove, with the positioning protrusion and the positioning groove cooperating.

4. A button battery according to claim 3, characterized in that, The outer side of the fixed section is provided with serrated anti-slip texture, and the inner wall of the outer shell is coated with an epoxy resin adhesive layer. The serrated anti-slip texture is compatible with the epoxy resin adhesive layer.

5. A button battery according to any one of claims 1 to 3, characterized in that, The fixing part is an open annular retaining spring, and the open end of the fixing part is provided with an outward chamfer. The top of the extension part is provided with a chamfer on the side facing the fixing part.

6. A button battery according to any one of claims 1 to 3, characterized in that, An annular pressure relief groove is provided on the bottom end face of the inner wall of the outer casing, and the bottom wall thickness of the pressure relief groove is 30%-40% of the outer casing wall thickness.

7. A button battery according to claim 6, characterized in that, The surface of the pressure relief groove is covered with a tearable sealing film with cross-shaped tear lines on the surface of the sealing film, and the edge of the sealing film is bonded to the inner wall of the outer shell.

8. A button battery according to claim 6, characterized in that, The pressure relief groove has a trapezoidal cross-section, and a silicone rubber buffer layer is installed at the bottom of the groove.

9. A button battery according to claim 8, characterized in that, The walls of the pressure relief tank are inclined, with the inner wall inclination angle α = 65° ± 2° and the outer wall inclination angle β = 40° ± 2°.

10. A button battery according to any one of claims 1 to 3, characterized in that, The outer surface of the shell is provided with anti-slip texture, which is a wave-shaped pattern evenly distributed along the circumference of the shell.

Images