Cylindrical lithium battery cap

Abstract

The utility model relates to the technical field of batteries, in particular to a cylindrical lithium battery cap, which is characterized in that each mounting groove is internally connected with an extrusion mechanism for improving the sealing effect; the extrusion mechanism comprises an installation ring, the installation ring is located in the installation groove, limiting protrusions are fixedly connected to the two sides of the installation ring, each limiting protrusion is connected with the installation groove in a clamped mode, through holes are formed in the two sides of the installation ring, and an extrusion piece is slidably connected to each through hole in an inserted mode and makes contact with the installation groove. The movable rod is pushed and pressed by air when the air pressure in the battery rapidly rises, the movable rod moves towards the inner wall of the battery shell under the limiting guide of the mounting ring, the movable rod drives the semicircular pressing piece to move, the semicircular pressing piece extrudes the sealing ring after moving, and the sealing ring is tightly attached to the inner wall of the battery shell after being pressed. And a gap between the sealing ring and the inner wall of the battery shell is sealed, so that the sealing effect of the sealing ring on the battery shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical lithium battery cap. Background Art

[0002] Lithium batteries are a type of battery with lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. They have very high requirements for sealing performance. As one of the important components of lithium batteries, the cap is directly related to the safety and service life of the battery. Currently, the cap generally consists of a top cover, a gasket, an explosion-proof film, a sealing ring, and an orifice plate.

[0003] When the battery is sealed, the battery steel shell after grooving is used to wrap and seal the cap. The inside and outside of the battery are only prevented from leaking air and liquid through the tight fit between the steel shell and the sealing ring. After the battery works and heats up, the gas inside the battery shell heats up, and the pressure of the battery shell increases. The heated gas is released from the gap between the steel shell and the sealing ring, resulting in air leakage and liquid leakage problems of the battery, reducing the cycle life and discharge performance of the battery, and the safety of the battery is not guaranteed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defect of poor sealing effect caused by the release of heated gas from the gap between the steel shell and the sealing ring in the prior art, and to propose a cylindrical lithium battery cap.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] Design a cylindrical lithium battery cap, including a top cover. A valve piece is connected to the upper end of the top cover. A sealing ring is fixedly connected inside the top cover. An explosion-proof mechanism is connected to the sealing ring. There is a chamber between the explosion-proof mechanism and the valve piece. A perforated plate is connected to the sealing ring. The perforated plate is located below the explosion-proof mechanism. A slot is opened at the bottom end of the sealing ring. A plurality of installation grooves are opened on the inner ring wall of the sealing ring. An extrusion mechanism for improving the sealing effect is connected in each installation groove;

[0007] The extrusion mechanism includes an installation ring. The installation ring is located in the installation groove. Limiting protrusions are fixedly connected to both sides of the installation ring. Each limiting protrusion is clamped in the installation groove. Through holes are opened on both sides of the installation ring. An extrusion piece is slidably inserted through each through hole. The extrusion piece is in contact with the installation groove.

[0008] Preferably, the top cover and the valve piece are of an integral structure.

[0009] Preferably, the explosion-proof mechanism includes a fixed ring which is inserted into the sealing ring. An explosion-proof film is fixedly connected to the inner wall of the inner ring of the fixed ring. Anti-disengagement protrusions are connected to both sides of the fixed ring, and each anti-disengagement protrusion is clamped to the sealing ring.

[0010] Preferably, a plurality of anti-disengagement protrusions are provided and are equally spaced along the axial line direction of the fixed ring.

[0011] Preferably, the pressing member includes a movable rod which is slidably inserted into the through hole. One end of the movable rod is fixedly connected with a semi-circular pressing piece which contacts the sealing ring.

[0012] Preferably, the semi-circular pressing piece has a triangular cross-section.

[0013] The beneficial effects of a cylindrical lithium battery cap proposed by the present utility model are as follows:

[0014] When the air pressure inside the battery rises rapidly, the gas pushes the movable rod. Under the limiting and guiding of the installation ring, the movable rod moves towards the inner wall of the battery housing. The movable rod drives the semi-circular pressing piece to move. After the semi-circular pressing piece moves, it presses the sealing ring. After being pressed, the sealing ring closely adheres to the inner wall of the battery housing, sealing the gap between the sealing ring and the inner wall of the battery housing, and improving the sealing effect of the sealing ring on the battery housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a cylindrical lithium battery cap proposed by the present utility model Figure 1 ;

[0016] Figure 2 is a schematic structural diagram of a cylindrical lithium battery cap proposed by the present utility model Figure 2 ;

[0017] Figure 3 is a schematic cross-sectional structural diagram of a cylindrical lithium battery cap proposed by the present utility model;

[0018] Figure 4 is Figure 3 a partial enlarged structural diagram at A in

[0019] Figure 5 is Figure 3 a partial enlarged structural diagram at B in

[0020] In the figure: 1, top cover; 2, valve plate; 3, sealing ring; 4, explosion-proof mechanism; 5, chamber; 6, slot; 7, pressing mechanism; 8, perforated plate; 41, fixed ring; 42, explosion-proof film; 43, anti-disengagement protrusion; 71, installation ring; 72, limiting protrusion; 73, through hole; 74, pressing member; 741, movable rod; 742, semi-circular pressing piece. Detailed implementation mode

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] Embodiment 1: Refer to Figure 1 、 2 Figures 3 and 5, a cylindrical lithium battery cap, including a top cover 1, a valve sheet 2 is connected to the upper end of the top cover 1, the top cover 1 and the valve sheet 2 are of an integral structure, a sealing ring 3 is fixedly connected inside the top cover 1, an explosion-proof mechanism 4 is connected to the sealing ring 3, a chamber 5 is provided between the explosion-proof mechanism 4 and the valve sheet 2, a perforated plate 8 is connected to the sealing ring 3, the perforated plate 8 is located below the explosion-proof mechanism 4, a slot 6 is opened at the bottom end of the sealing ring 3, and a plurality of installation grooves are opened on the inner ring wall of the sealing ring 3. An extrusion mechanism 7 for improving the sealing effect is connected in each installation groove;

[0023] The extrusion mechanism 7 includes an installation ring 71, the installation ring 71 is located in the installation groove, limiting protrusions 72 are fixedly connected to both sides of the installation ring 71, each limiting protrusion 72 is clamped in the installation groove, through holes 73 are opened on both sides of the installation ring 71, and an extrusion member 74 is slidably inserted into each through hole 73, and the extrusion member 74 is in contact with the installation groove;

[0024] The extrusion member 74 includes a movable rod 741, the movable rod 741 is slidably inserted into the through hole 73, one end of the movable rod 741 is fixedly connected with a semi-circular pressing piece 742, the semi-circular pressing piece 742 is in contact with the sealing ring 3, and the semi-circular pressing piece 742 has a triangular cross section.

[0025] Working process:

[0026] The upper end of the battery housing is inserted into the slot 6. When the air pressure inside the battery rises rapidly, the gas squeezes the explosion-proof mechanism 4. After being squeezed by the gas, the explosion-proof mechanism 4 adjusts the pressure in the chamber 5 to balance the internal and external air pressures of the battery, achieving an explosion-proof effect;

[0027] At the same time, when the air pressure inside the battery rises rapidly, the gas pushes the movable rod 741. Under the limiting and guiding of the installation ring 71, the movable rod 741 moves towards the inner wall of the battery housing. The movable rod 741 drives the semi-circular pressing piece 742 to move. After the semi-circular pressing piece 742 moves, it squeezes the sealing ring 3. After being pressed, the sealing ring 3 closely adheres to the inner wall of the battery housing, sealing the gap between the sealing ring 3 and the inner wall of the battery housing, and improving the sealing effect of the sealing ring 3 on the battery housing.

[0028] Embodiment 2: In Embodiment 1, when the explosion-proof mechanism 4 is installed on the sealing ring 3, the explosion-proof mechanism 4 is likely to fall off the sealing ring 3. Refer toFigure 4 , as another preferred embodiment of the present utility model, the difference from Embodiment 1 is that the explosion-proof mechanism 4 includes a fixing ring 41, the fixing ring 41 is inserted with a sealing ring 3, an explosion-proof film 42 is fixedly connected to the inner ring wall of the fixing ring 41, anti-detachment protrusions 43 are connected to both sides of the fixing ring 41, each anti-detachment protrusion 43 is clamped with the sealing ring 3, a plurality of anti-detachment protrusions 43 are provided and are equally spaced along the axial line direction of the fixing ring 41. After the fixing ring 41 is inserted into the sealing ring 3, the fixing ring 41 is fixed by clamping the sealing ring 3 with the anti-detachment protrusions 43, and then the explosion-proof film 42 is fixed, and the fixing ring 41 is not easily dropped from the sealing ring 3.

[0029] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A cylindrical lithium battery cap, characterized in that: It comprises a top cover (1), wherein: The upper end of the top cover (1) is connected to a valve plate (2), a sealing ring (3) is fixedly connected inside the top cover (1), an explosion-proof mechanism (4) is connected to the sealing ring (3), a chamber (5) is provided between the explosion-proof mechanism (4) and the valve plate (2), a perforated plate (8) is connected to the sealing ring (3), the perforated plate (8) is located below the explosion-proof mechanism (4), a slot (6) is provided at the bottom end of the sealing ring (3), a plurality of installation grooves are provided on the inner ring wall of the sealing ring (3), and each of the installation grooves is connected to an extrusion mechanism (7) for improving the sealing effect; The extrusion mechanism (7) comprises a mounting ring (71), the mounting ring (71) is located in the mounting groove, both sides of the mounting ring (71) are fixedly connected with limiting protrusions (72), each of the limiting protrusions (72) is clamped in the mounting groove, both sides of the mounting ring (71) are provided with through holes (73), each of the through holes (73) is slidably plugged with an extrusion piece (74), and the extrusion piece (74) is in contact with the mounting groove.

2. The cylindrical lithium battery cap according to claim 1, characterized in that: The top cover (1) and the valve plate (2) are an integral structure.

3. The cylindrical lithium battery cap according to claim 1, characterized in that: The explosion-proof mechanism (4) comprises a fixing ring (41), the fixing ring (41) is plugged into the sealing ring (3), an explosion-proof membrane (42) is fixedly connected to the inner ring wall of the fixing ring (41), both sides of the fixing ring (41) are connected to anti-slip protrusions (43), and each of the anti-slip protrusions (43) is clamped to the sealing ring (3).

4. The cylindrical lithium battery cap according to claim 3, characterized in that: The anti-slip protrusions (43) are provided in plurality and are distributed at equal intervals along the axis direction of the fixing ring (41).

5. The cylindrical lithium battery cap according to claim 1, characterized in that: The extrusion piece (74) comprises a movable rod (741) which is slidably plugged into the through hole (73); one end of the movable rod (741) is fixedly connected to a semicircular pressing sheet (742), and the semicircular pressing sheet (742) is in contact with the sealing ring (3).

6. The cylindrical lithium battery cap according to claim 5, characterized in that: The semicircular pressing sheet (742) has a triangular cross section.

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