A sealing structure of a lithium battery steel shell

Abstract

This utility model relates to the field of lithium battery technology and discloses a sealing structure for a lithium battery steel shell, including an outer shell and a base plate movably installed on the inner wall of the outer shell, and further including: a sealing plate movably connected to the open end of the outer shell above the base plate. This sealing structure for the lithium battery steel shell forms a preliminary mechanical seal through the arc-shaped fit between the groove at the top of the outer shell and the sealing plate and the bend, preventing electrolyte leakage from the connection point; the double sealing design of the sealing element and the sealing ring, through the compression of the rubber gasket and the elastic deformation of the O-ring to fill the gap, blocks the liquid penetration path; the S-shaped structure of the gasket undergoes elastic deformation under stress, tightly fitting the contact surface of the components, filling gaps, and preventing the intrusion of external impurities or internal gas leakage; simultaneously, the deformation absorbs external impact energy, reducing the direct stress on the sealing structure and preventing damage to key parts such as the groove and bend due to stress.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a sealing structure for a lithium battery steel shell. Background Technology

[0002] Lithium-ion batteries, which use lithium metal or lithium alloy as the negative electrode material and employ a non-aqueous electrolyte solution, are widely used in various electronic devices due to their advantages such as high energy density, safety, zero pollution, and environmental friendliness, resulting in continuously growing market demand. In the lithium-ion battery production process, the sealing stage is one of the key processes determining battery performance and safety.

[0003] In the existing technology, the sealing structure of the steel shell of lithium battery has insufficient sealing performance, which may lead to electrolyte leakage or intrusion of external impurities, affecting battery life and safety; the mechanical strength and stability of the sealing structure are also poor, and the structure is easily damaged by external forces during transportation or use. Therefore, we propose a sealing structure for the steel shell of lithium battery to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sealing structure for a lithium battery steel casing, solving the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a sealing structure for a lithium battery steel shell, including an outer shell and a base plate movably installed on the inner wall of the outer shell, and further including:

[0006] A sealing plate is movably connected to the opening end of the outer shell above the bottom plate. The end of the sealing plate extends inward to form a meandering part. The outer shell is provided with a groove that matches the meandering part. When the sealing plate is connected to the outer shell, the meandering part abuts against the inner wall of the groove to form a limiting area.

[0007] The edge of the base plate is bent upward into an arc shape, and a sealing element is fixedly connected to the upper part of the base plate. A sealing ring is fixedly installed on one side of the sealing element. When the sealing plate is connected to the outer shell, the sealing element and the sealing ring abut against the corresponding side of the sealing plate to form a sealing area.

[0008] Furthermore, the cross-sectional shape of the detour section is "J" shaped, and the groove entry section is provided with an arc-shaped groove corresponding to the position of the detour section.

[0009] Furthermore, the sealing element is an annular rubber gasket, and the sealing ring is an O-ring; the sealing ring is embedded in the meandering portion, and the sealing element and the sealing ring are fixedly connected.

[0010] Furthermore, the sealing plate has an exhaust hole, and a valve body is movably installed between the base plate and the sealing plate; a valve hole is provided at the center of the base plate.

[0011] Furthermore, an annular support plate is fixedly connected inside the outer shell, a connector is fixedly connected to the end of the support plate, and a base plate is fixedly installed on the top of the connector.

[0012] Furthermore, the inner wall of the outer casing is sealed with a gasket at the groove inlet, and the end of the gasket is movably connected to the support plate.

[0013] The beneficial effects of this utility model are:

[0014] The sealing structure of this lithium battery steel casing forms a preliminary mechanical seal through the arc-shaped fit between the groove at the top of the casing and the sealing plate and the bend, preventing electrolyte leakage from the connection point. The double sealing design of the sealing element and the sealing ring blocks the liquid penetration path through the compression of the rubber gasket and the elastic deformation of the O-ring to fill the gap. The S-shaped gasket enhances the sealing and buffering performance: the S-shaped structure of the gasket undergoes elastic deformation under stress, tightly fitting the contact surface of the component, filling the gap, and preventing the intrusion of external impurities or internal gas leakage. At the same time, the deformation absorbs external impact energy, reducing the direct effect of stress on the sealing structure and preventing damage to key parts such as the groove and bend due to stress. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a partial cross-sectional view of the structure of this utility model;

[0018] Figure 3 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0020] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Inlet section; 3. Sealing plate; 31. Detour section; 4. Vent hole; 5. Valve body; 6. Base plate; 7. Valve hole; 8. Seal; 9. Sealing ring; 10. Support; 11. Connector; 12. Gasket. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] Please see Figures 1-4 A sealing structure for a lithium battery steel casing includes an outer casing 1 and a base plate 6 movably mounted on the inner wall of the outer casing 1, and further includes:

[0023] A sealing plate 3 is movably connected to the opening end of the outer shell 1 above the bottom plate 6. The end of the sealing plate 3 extends inward to form a meandering part 31. The two work together to form a limiting area. A groove 2 matching the meandering part 31 is provided on the outer shell 1. When the sealing plate 3 is connected to the outer shell 1, the meandering part 31 abuts against the inner wall of the groove 2 to form a limiting area.

[0024] The edge of the base plate 6 is bent upward into an arc shape, and the arc ring cooperates with the detour part 31 and the groove part 2. A sealing element 8 is fixedly connected to the upper part of the base plate 6, and a sealing ring 9 is fixedly installed on one side of the sealing element 8. When the sealing plate 3 is connected to the outer shell 1, the sealing element 8 and the sealing ring 9 abut against the corresponding side of the sealing plate 3 to form a sealing area.

[0025] In this embodiment, the base plate 6 is fixed to the support plate 10 by the connector 11, ensuring that the arc-shaped bend of the edge of the base plate 6 is aligned with the inner wall of the outer shell 1. A sealing element 8 is installed on the upper part of the base plate 6, and an O-ring seal 9 is embedded in the meandering part 31 of the sealing plate 3, so that the sealing element 8 and the sealing ring 9 are fixedly connected. Then, the sealing plate 3 is placed over the opening end of the outer shell 1, so that the meandering part 31 is inserted into the groove 2. The arc-shaped structures of the two abut against each other to form a limiting area. At the same time, the sealing element 8 and the sealing ring 9 are pressed against the side of the sealing plate 3 to form a sealing area. When there is a risk of leakage of electrolyte inside the battery, the mechanical engagement of the groove 2 and the meandering part 31 and the double sealing layer of the sealing element 8 and the sealing ring 9 work together to prevent electrolyte leakage and external impurities from entering.

[0026] Reference Figure 4 As shown, the cross-sectional shape of the detour section 31 is "J" shaped, and the groove entry section 2 is provided with an arc-shaped groove corresponding to the position of the detour section 31.

[0027] In this embodiment, the meandering part 31 is an arc-shaped "J" structure that folds inward toward the inner side of the outer shell 1, and an arc-shaped groove is opened at the corresponding position of the groove part 2. The two are matched in size and form a sealing structure through mechanical interlocking, which prevents the electrolyte from leaking from the connection between the outer shell 1 and the sealing plate 3, while limiting the displacement of the sealing plate 3 and enhancing the structural stability.

[0028] Reference Figure 4 As shown, the sealing element 8 is an annular rubber gasket, and the sealing ring 9 is an O-ring; the sealing ring 9 is embedded in the bend portion 31, and the sealing element 8 and the sealing ring 9 are fixedly connected.

[0029] In this embodiment, when the sealing plate 3 is connected to the outer shell 1, the sealing element 8 and the sealing ring 9 are squeezed and undergo elastic deformation, filling the gap between the sealing plate 3 and the bottom plate 1, blocking the liquid penetration path, and forming a double sealing barrier.

[0030] Reference Figure 3 As shown, the sealing plate 3 has an exhaust hole 4, and the bottom plate 6 and the sealing plate 3 are movably installed with a valve body 5; the bottom plate 6 has a valve hole 7 at its center.

[0031] In this embodiment, when the pressure rises due to gas generated by the chemical reaction inside the battery, the gas pushes the valve body 5 upward through the valve hole 7 of the base plate 6, and the gas is discharged through the exhaust hole 4. After the pressure drops, the valve body 5 resets to prevent the battery from being damaged due to overpressure.

[0032] Reference Figure 3 and Figure 4 As shown, an annular support plate 10 is also fixedly connected inside the outer casing 1. A connector 11 is fixedly connected to the end of the support plate 10, and a base plate 6 is fixedly installed on the top of the connector 11.

[0033] Reference Figure 4 As shown, a gasket 12 is sealed to the inner wall of the outer casing 1 at the groove 2, and the end of the gasket 12 is movably connected to the support plate 10.

[0034] In this embodiment, if the battery is subjected to external stress such as vibration or compression during transportation or use, the S-shaped gasket 12 generates buffering force through elastic deformation, reducing the impact of stress on the sealing structure. At the same time, the deformation of the gasket 12 further conforms to the contact surface between the outer shell 1 and the bottom plate 6, enhancing the sealing effect.

[0035] In use, the base plate 6 is fixed to the support plate 10 via the connector 11, ensuring that the arc-shaped bend at the edge of the base plate 6 is aligned with the inner wall of the outer casing 1; a seal 8 is installed on the upper part of the base plate 6, and an O-ring seal 9 is embedded in the meandering part 31 of the sealing plate 3, so that the seal 8 and the seal ring 9 are fixedly connected; the sealing plate 3 is placed over the opening end of the outer casing 1, so that the meandering part 31 is inserted into the groove 2, and the arc-shaped structures of the two abut against each other to form a limiting area, while the seal 8 and the seal ring 9 are pressed against the side of the sealing plate 3 to form a sealing area; when there is a risk of leakage of electrolyte inside the battery, the groove 2 and the meandering part 31... The mechanical interlocking and the double sealing layer of the seal 8 and the sealing ring 9 work together to prevent electrolyte leakage and the intrusion of external impurities. If the battery is subjected to external stress such as vibration or compression during transportation or use, the S-shaped gasket 12 generates buffering force through elastic deformation, reducing the impact of stress on the sealing structure. At the same time, the gasket deformation further conforms to the contact surface between the outer shell 1 and the base plate 6, enhancing the sealing effect. When the pressure rises due to gas generated by chemical reaction inside the battery, the gas pushes the valve body 5 upward through the valve hole 7 of the base plate 6, and the gas is discharged through the exhaust hole 4. After the pressure drops, the valve body 5 resets to prevent the battery from being damaged due to overpressure.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealing structure for a lithium battery steel casing, comprising an outer casing (1) and a base plate (6) movably mounted on the inner wall of the outer casing (1), characterized in that, Also includes: A sealing plate (3) is movably connected to the opening end of the outer shell (1) and above the bottom plate (6). The end of the sealing plate (3) extends inward and forms a meandering part (31). The outer shell (1) is provided with a groove (2) that matches the meandering part (31). When the sealing plate (3) is connected to the outer shell (1), the meandering part (31) abuts against the inner wall of the groove (2) to form a limiting area. The edge of the base plate (6) is bent upward into an arc ring. A sealing element (8) is fixedly connected to the upper part of the base plate (6). A sealing ring (9) is fixedly installed on one side of the sealing element (8). When the sealing plate (3) is connected to the outer shell (1), the sealing element (8) and the sealing ring (9) abut against the corresponding side of the sealing plate (3) to form a sealing area.

2. The sealing structure of a lithium battery steel shell according to claim 1, characterized in that: The cross-sectional shape of the detour section (31) is "J" shaped, and the groove section (2) is provided with an arc-shaped groove corresponding to the position of the detour section (31).

3. The sealing structure of a lithium battery steel shell according to claim 2, characterized in that: The sealing element (8) is an annular rubber gasket, and the sealing ring (9) is an O-ring; the sealing ring (9) is embedded in the meandering part (31), and the sealing element (8) and the sealing ring (9) are fixedly connected.

4. The sealing structure of a lithium battery steel shell according to claim 3, characterized in that: The sealing plate (3) is provided with an exhaust hole (4), and a valve body (5) is movably installed between the bottom plate (6) and the sealing plate (3); a valve hole (7) is provided at the center of the bottom plate (6).

5. The sealing structure of a lithium battery steel shell according to claim 4, characterized in that: An annular support plate (10) is also fixedly connected inside the outer shell (1). A connector (11) is fixedly connected to the end of the support plate (10), and a base plate (6) is fixedly installed on the top of the connector (11).

6. The sealing structure of a lithium battery steel casing according to claim 5, characterized in that: The inner wall of the outer shell (1) is sealed with a gasket (12) at the groove (2) and the end of the gasket (12) is movably connected to the support plate (10).

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