A cover plate sealing structure for a sodium-ion battery

Abstract

This invention discloses a cover sealing structure for sodium-ion batteries, including a housing. An encapsulation mechanism is provided on the outside of the housing, comprising a cover disposed outside the housing. A rectangular frame is movably connected to the outer surface of the cover. One end of the rectangular frame is fixedly connected to one end of the housing, and a groove is formed at the other end of the rectangular frame. A fixed frame is fixedly connected to the outer surface of the cover. This invention relates to the field of sodium-ion battery encapsulation technology and solves the problems of existing sodium-ion battery cover encapsulation methods that use single welding or glue sealing. These methods result in the cover being difficult to disassemble, increasing subsequent maintenance costs. Furthermore, alkaline electrolytes can shorten the lifespan of the encapsulation structure, leading to electrolyte leakage that can cause short circuits or fires. Additionally, the expansion and contraction of the electrolyte during charging and discharging can cause the battery housing and cover to detach due to stress.

Description

Technical Field

[0001] This invention relates to the field of sodium-ion battery packaging technology, specifically to a cover sealing structure for sodium-ion batteries. Background Technology

[0002] Sodium-ion batteries, as a new type of rechargeable battery, have advantages such as abundant raw material reserves, low cost, and superior safety compared to lithium-ion batteries. Currently, most existing sodium-ion battery cover sealing structures follow the sealing design of lithium-ion batteries, mainly employing welded seals or single glue seal structures. This results in the following prominent technical defects, making them unsuitable for the special operating requirements of sodium-ion batteries: 1) When using welding for encapsulation, on the one hand, the weld is easily corroded by the alkaline electrolyte of sodium-ion batteries, leading to seal failure. On the other hand, the welded seal is a non-removable structure, which cannot be disassembled and repaired when internal failure occurs, and can only be scrapped as a whole, increasing the cost of use. 2) When using glue sealing for encapsulation, on the one hand, it requires a long curing time, resulting in low assembly efficiency. After the glue layer cures, it is easy to stick to the cover plate and shell, making subsequent disassembly difficult. On the other hand, the glue sealing structure is prone to aging and cracking in alkaline environments, resulting in a short service life. At the same time, when the glue seal fails, the electrolyte is prone to leakage, causing safety hazards such as battery short circuit and fire. 3) During the charging and discharging process of sodium-ion batteries, the electrode materials expand and contract, causing periodic deformation of the battery casing and cover. The existing sealing structure lacks an elastic compensation mechanism, and the seals are prone to wear and detachment due to long-term cyclic stress, resulting in a gradual decline in sealing performance.

[0003] Therefore, it is necessary to address the shortcomings of traditional packaging methods in sodium-ion battery cover packaging. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cover sealing structure for sodium-ion batteries. This solves the problems of existing sodium-ion battery cover encapsulation methods that use single welding or glue sealing. On the one hand, this makes the cover difficult to disassemble, increasing subsequent maintenance costs. On the other hand, alkaline electrolytes can easily shorten the lifespan of the encapsulation structure, leading to electrolyte leakage that can cause battery short circuits or fires. Additionally, the expansion and contraction of the electrolyte during charging and discharging can easily cause the battery casing and cover to detach due to stress.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cover sealing structure for a sodium-ion battery, comprising a housing, an encapsulation mechanism disposed on the outside of the housing, the encapsulation mechanism comprising a cover, the cover being disposed outside the housing, a rectangular frame being movably connected to the outer surface of the cover, one end of the rectangular frame being fixedly connected to one end of the housing, and a groove being formed at the other end of the rectangular frame, a fixed frame being fixedly connected to the outer surface of the cover, the outer surface of the fixed frame being movably connected to the inside of the groove, a flexible plate being fixedly connected to both sides of the outer surface of the fixed frame, a stop plate being movably connected to the outer surfaces of both flexible plates, the outer surfaces of both stop plates being fixedly connected to both sides of the inside of the groove, and a sealing gasket being fixedly connected to the outer surface of the cover, the outer surface of the sealing gasket being movably connected to the other end of the rectangular frame.

[0006] Preferably, the body of the shell cover has a through filling port, and an explosion-proof valve is installed inside the filling port.

[0007] Preferably, a locking assembly is provided on the outside of the rectangular frame. The locking assembly includes a connecting plate, the outer surface of which is fixedly connected to the outer surface of the fixed frame. The body of the connecting plate has a groove, and a pusher is movably connected inside the groove. The outer surface of the pusher is movably connected to the inside of the groove. A slide tube is fixedly connected to the outer surface of the pusher. A fixed sleeve is slidably connected through the outer surface of the slide tube. One end of the fixed sleeve is fixedly connected to the inside of the groove. A pusher ring is fixedly connected to one end of the slide tube. The outer surface of the pusher ring is movably connected to the inside of the fixed sleeve.

[0008] Preferably, the fixed sleeve has an internal air hole, which is located on the inner wall of the groove. The air hole is connected to a sliding groove, which is located on the inner wall of the rectangular frame. One end of the sliding tube and the outer surface of the abutment ring are slidably connected to the inside of the sliding groove through the air hole. A sliding plate is slidably connected to the inside of the sliding groove. The outer surface of the sliding plate abuts against two arc strips. The outer surfaces of the two arc strips are fixedly connected to the inside of the sliding groove. A compression spring is fixedly connected to the outer surface of the sliding plate, and one end of the compression spring is fixedly connected to the inside of the sliding groove.

[0009] Preferably, the abutment is provided with a linkage unit on its exterior. The linkage unit includes a rotating bar, the outer surface of which is rotatably connected to the interior of the groove. One end of the rotating bar has a through groove, and a pin is slidably connected inside the groove. The outer surface of the pin is slidably connected to the interior of the groove, and one end of the pin is fixedly connected to the outer surface of the abutment.

[0010] Preferably, one end of the rotating bar is fixedly connected to a rotating rod, and a fixed plate is rotatably connected through the outer surface of the rotating rod. The outer surface of the fixed plate is fixedly connected to the inside of the groove. A torsion spring is sleeved on the outside of the rotating rod, and the two ends of the torsion spring are fixedly connected to the outer surfaces of the rotating bar and the fixed plate, respectively.

[0011] Preferably, a drive module is provided on the outside of the rotating rod. The drive module includes a threaded groove, which is formed on the body of the cover and is in a through state. A bolt is threadedly connected inside the threaded groove. One end of the bolt is rotatably connected to the inside of the groove. Two support plates are provided on the outside of the bolt. The outer surfaces of the two support plates are fixedly connected to the inside of the groove. A threaded ring is fixedly connected to the outer surface of one of the support plates. The inner ring of the threaded ring is threadedly connected to the outer surface of the bolt.

[0012] Preferably, the body of another support plate is rotatably connected to a vertical rod, the body of the vertical rod is movably connected to a spiral strip, both ends of the spiral strip are fixedly connected to a clamping plate, the outer surface of one clamping plate is movably connected to one end of a bolt, a chain is sleeved on the outside of the spiral strip, and two sprockets are drivenly connected to the outer surface of the chain, the bodies of the two sprockets are respectively fixedly connected to the outer surfaces of the vertical rod and the rotating rod. Beneficial effects

[0013] This invention provides a cover sealing structure for sodium-ion batteries. Compared with the prior art, it has the following advantages: (1) By setting up a packaging mechanism, the shell cover and the shell are spliced ​​together using a rectangular frame. At the same time, the shell cover is attached to the rectangular frame through a sealing gasket to form an inner sealing measure. The recessed setting of the groove and the connection between the fixed frame and the inside of the groove, and the abutment of the two side plates and the flexible plate, on the one hand, facilitates the positioning and packaging of the shell cover, improves the packaging efficiency, and makes the shell cover removable, thereby reducing the difficulty and cost of subsequent maintenance. On the other hand, by setting the inner flexible plate and the abutment plate into a U-shape, the abutment of the two not only improves the stability of the shell cover, but also forms an outer sealing measure. Thus, through the double sealing measures, the sealing performance of the shell cover and the shell is further improved.

[0014] (2) By setting a locking component, the slide tube first slides along the axial direction of the fixed sleeve, which can drive the abutment to move and interact with the abutment groove. The two limit the shell cover by oblique contact, thereby improving the stability of the shell cover. When the electrolyte expands, the slide plate slides inside the slide groove, thereby compressing the air inside the slide groove and allowing it to enter the fixed sleeve and slide tube through the air hole, so that the slide tube pushes the abutment to slide axially, thereby further improving the stability of the shell cover and avoiding the problems of electrolyte leakage and damage to the shell and shell cover due to stress.

[0015] (3) By setting up a linkage unit, the rotation of the rotating rod on the fixed plate can drive the rotating bar to rotate. The rotation of the rotating bar, through the movement of the pin in the groove, can move the abutment to slide axially, so that the abutment can be obliquely abutted with the groove. At the same time, the torsion spring is compressed during this process. When the abutment is freed from the external force, it can be reset by the rebound of the torsion spring, which facilitates the disassembly of the shell cover and the maintenance of the shell interior, reducing the subsequent maintenance cost. In addition, the distance between the two ends of the rotating bar is large, which makes it easy to rotate at a small angle so that the abutment and the groove abut together, thereby improving the stability of their action.

[0016] (4) By setting up a drive module, the screw connection of bolts and rings can not only fix and support the shell cover and bolts, but also push the spiral to move axially through the abutment of the bolt with the side plate. Then, the vertical rod is rotated through the spiral abutment action. Then, through the transmission connection of sprocket and chain, the rotating rod can drive the rotating bar and the abutment to move, so as to realize the abutment and the groove abutting action. By the abutment of one end of the bolt with the side plate, the spiral can be limited, thus maintaining the stability of the abutment and the groove abutting action. Attached Figure Description

[0017] Figure 1 This is a perspective view of the external structure of the present invention; Figure 2 This is a perspective view of the internal structure of the rectangular frame of the present invention; Figure 3 This is a perspective view of the external structure of the butt of the present invention; Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a perspective view of the external structure of the rotating rod of the present invention; Figure 6 This is a perspective view of the external structure of the vertical rod of the present invention.

[0018] In the diagram: 1. Housing; 2. Housing cover; 3. Rectangular frame; 4. Groove; 5. Fixed frame; 6. Rigid plate; 7. Abutment plate; 8. Locking assembly; 81. Connecting plate; 82. Abutment groove; 83. Abutment head; 84. Linkage unit; 841. Rotating bar; 842. Slot; 843. Pin; 844. Rotating rod; 845. Fixed plate; 846. Drive module; 8461. Threaded groove; 8462. Bolt; 84 63. Support plate; 8464. Threaded ring; 8465. Vertical rod; 8466. Spiral strip; 8467. Clamping plate; 8468. Chain; 8469. Sprocket; 847. Torsion spring; 85. Slide tube; 86. Fixed sleeve; 87. Abutment ring; 88. Air hole; 89. Slide groove; 810. Slide plate; 811. Arc strip; 812. Compression spring; 9. Sealing gasket; 10. Filling port; 11. Explosion-proof valve. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-6 This invention provides a technical solution: a cover sealing structure for sodium-ion batteries. The system includes a housing 1, which contains an alkaline electrolyte. An encapsulation mechanism, including a cover 2, is located on the outside of the housing 1. The cover 2 is made of 5052 aluminum alloy and has an electrode post (not shown in the figure). The cover 2 is positioned outside the housing 1. A rectangular frame 3 is movably connected to the outer surface of the cover 2. The rectangular frame 3 is made of a material that is pressure-resistant, alkali-corrosion resistant, and has a hardness greater than that of the housing 1, to compensate for the fact that the thickness of the rectangular frame 3 is less than that of the housing 1. One end of the rectangular frame 3 is fixedly connected to one end of the housing 1, and the other end of the rectangular frame 3 has a groove 4, which serves to accommodate the fixed structure of the cover 2. A fixed frame 5 is fixedly connected to the outer surface of the cover 2, located at the center of the groove 4. The outer surface of the fixed frame 5 is movably connected to the interior of the groove 4. Flexible plates 6 are fixedly connected to both sides of the outer surface of the fixed frame 5. The side sectional view of the flexible plate 6 shows an inverted V-shape. Both are made of materials with high hardness, pressure resistance, wear resistance, and good toughness. The outer surfaces of both flexible plates 6 are movably connected to the abutment plate 7. The side sectional view of both abutment plates 7 shows an inverted V-shape. Both are made of materials with high hardness, pressure resistance, and wear resistance. At the same time, the top view of the inner flexible plate 6 and abutment plate 7 shows a U-shaped structure. The two are fitted together to form a seal to constitute an outer sealing measure. Both outer surfaces are provided with a modified PTFE surface layer to further improve the alkali resistance, pressure resistance, and wear resistance. The outer surfaces of the two abutment plates 7 are fixedly connected to the two sides inside the groove 4. The outer surface of the shell cover 2 is fixedly connected to the sealing gasket 9. The sealing gasket 9 is made of fluororubber material to improve the sealing performance of the shell cover 2 and the rectangular frame 3 and the alkali corrosion resistance. The outer surface of the sealing gasket 9 is movably connected to the other end of the rectangular frame 3.

[0021] The main body of the shell cover 2 has a through filling port 10, which is used to fill alkaline electrolyte. An explosion-proof valve 11 is installed inside the filling port 10. The explosion-proof valve 11 is model SD-M083-42.

[0022] A locking assembly 8 is provided on the outside of the rectangular frame 3. The locking assembly 8 includes a connecting plate 81. The connecting plate 81, through the cooperation of the abutment plate 7 and the flexible plate 6, serves to connect, fix, and position the frame. The outer surface of the connecting plate 81 is fixedly connected to the outer surface of the fixed frame 5. The body of the connecting plate 81 has an abutment groove 82. The bottom of the inner wall of the abutment groove 82 is inclined and chamfered. An abutment head 83 is movably connected inside the abutment groove 82. One end of the abutment head 83 is inclined and chamfered. Through the inclined abutment action with the abutment groove 82, the shell cover 2 can be stretched by the connecting plate 81 to further improve the tightness of the fit between the shell cover 2 and the rectangular frame 3. The sealing mechanism is as follows: the outer surface of the abutment 83 is movably connected to the interior of the groove 4; a slide tube 85 is fixedly connected to the outer surface of the abutment 83, which serves as a sliding guide for the abutment 83 and also regulates the air pressure; a fixed sleeve 86 is slidably connected through the outer surface of the slide tube 85, which serves as a fixed support and connection; one end of the fixed sleeve 86 is fixedly connected to the interior of the groove 4; and a stop ring 87 is fixedly connected to one end of the slide tube 85, which limits the sliding of one end of the slide tube 85; the outer surface of the stop ring 87 is movably connected to the interior of the fixed sleeve 86.

[0023] The fixed sleeve 86 has an internal air hole 88, which serves as a connection. The air hole 88 is located on the inner wall of the groove 4. The air hole 88 is connected to a sliding groove 89, the inner diameter of which is larger than the inner diameter of the air hole 88 and the fixed sleeve 86. The sliding groove 89 is located on the inner wall of the rectangular frame 3. One end of the sliding tube 85 and the outer surface of the abutment ring 87 are slidably connected to the inside of the sliding groove 89 through the air hole 88. A sliding plate 810 is slidably connected inside the sliding groove 89. The sliding plate 810 is made of a pressure-resistant and wear-resistant material, and a modified PTFE surface layer is provided on the side near the alkaline electrolyte. Two arc strips 8 are abutted on the outer surface of the sliding plate 810. 11. The outer surface of the arc strip 811 is provided with a modified PTFE surface layer, which can limit the movement of the slide plate 810. The distance between one end of the two arc strips 811 can facilitate the flow of alkaline electrolyte between the slide groove 89 and the rectangular frame 3. The outer surfaces of the two arc strips 811 are fixedly connected to the inside of the slide groove 89. A compression spring 812 is fixedly connected to the outer surface of the slide plate 810. The compression spring 812 is made of a pressure-resistant and fatigue-resistant material. It can reset the slide plate 810 through rebound, so as to restore the air pressure inside the slide groove 89 and facilitate the reset of the butt head 83. One end of the compression spring 812 is fixedly connected to the inside of the slide groove 89.

[0024] The abutment 83 is externally equipped with a linkage unit 84, which includes a rotating bar 841. The two ends of the rotating bar 841 are spaced far apart, so that rotating one end at a small angle allows the other end to move with a large displacement. The outer surface of the rotating bar 841 is rotatably connected to the inside of the groove 4. One end of the rotating bar 841 has a through groove 842. The inner width of the groove 842 is adapted to the outer diameter of the pin 843, and the inner length is large to allow the pin 843 to move and adjust within it, thereby actuating the abutment 83 to slide axially. The pin 843 is slidably connected inside the groove 842. The pin 843 connects and fixes the abutment 83 and clamps and limits its movement, thereby improving the stability of the connection between the abutment 83 and the rotating bar 841. The outer surface of the pin 843 is slidably connected to the inside of the groove 4, and one end of the pin 843 is fixedly connected to the outer surface of the abutment 83.

[0025] One end of the rotating bar 841 is fixedly connected to a rotating rod 844. A fixed plate 845 is rotatably connected through the outer surface of the rotating rod 844. The fixed plate 845 serves as a fixed support, and the connection between the rotating rod 844 and the fixed plate 845 is provided with an axial limiting measure (not shown in the figure). The outer surface of the fixed plate 845 is fixedly connected to the inside of the groove 4. A torsion spring 847 is sleeved on the outside of the rotating rod 844. The torsion spring 847 is made of a material that is resistant to compression and fatigue. Through its rebound, the rotating bar 841 can be easily reversed and reset, thereby driving the abutment 83 to reset so as to facilitate the disassembly and assembly of the cover 2. The two ends of the torsion spring 847 are fixedly connected to the outer surfaces of the rotating bar 841 and the fixed plate 845, respectively.

[0026] A drive module 846 is provided on the outside of the rotating rod 844. The drive module 846 includes a screw groove 8461, which is formed on the body of the cover 2 and is in a through state. The screw groove 8461 is a mounting hole on the cover 2. A bolt 8462 is threadedly connected inside the screw groove 8461. The bolt 8462 fixes the cover 2 through the threaded connection. One end of the bolt 8462 is rotatably connected to the inside of the groove 4. Two support plates 8463 are provided on the outside of the bolt 8462. The support plates 8463 play a fixed support role. The outer surfaces of the two support plates 8463 are fixedly connected to the inside of the groove 4. A threaded ring 8464 is fixedly connected to the outer surface of one support plate 8463. The threaded ring 8464 fixes the cover 2 through the threaded connection with the bolt 8462. The inner ring of the threaded ring 8464 is threadedly connected to the outer surface of the bolt 8462.

[0027] Another support plate 8463 has a vertical rod 8465 rotatably connected to its body. The connection between the vertical rod 8465 and the support plate 8463 is provided with an axial limiting measure (not shown in the figure), and an axially penetrating spiral groove is provided at the center. The body of the vertical rod 8465 is movably connected with a spiral strip 8466. The spiral strip 8466 drives the vertical rod 8465 to rotate during axial movement by spirally abutting against the spiral groove. Both ends of the spiral strip 8466 are fixedly connected with clamping plates 8467, which limit the movement of the spiral strip 8466. The outer surface of one clamping plate 8467 is movably connected to one end of a bolt 8462. A chain 8468 is sleeved on the outside of the spiral strip 8466. Two sprockets 8469 are connected to the outer surface of the chain 8468. The bodies of the two sprockets 8469 are respectively fixedly connected to the outer surfaces of the vertical rod 8465 and the rotating rod 844.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] Working principle: The casing 1 is the main supporting structure of the battery. The rectangular frame 3 fixed at its end provides the basic positioning and connection carrier for the encapsulation of the casing cover 2. When the casing cover 2 encapsulates the casing 1, the fixed frame 5 on the outer surface of the casing cover 2 is embedded in the groove 4 at the end of the rectangular frame 3, completing the initial positioning and splicing. At this time, the sealing gasket 9 on the outer surface of the casing cover 2 is tightly attached to the end face of the rectangular frame 3, forming an inner sealing barrier. The flexible plates 6 on both sides of the fixed frame 5 abut against the abutment plate 7 on the inner wall of the groove 4, and the inner abutment plate 7 and flexible plate 6 are both set in a U-shape. The two abut against each other to form an outer sealing barrier. The double sealing structure greatly improves the sealing performance of the connection between the casing 1 and the casing cover 2. At the same time, this splicing structure provides a basis for subsequent disassembly and maintenance. After the cover 2 is positioned, the cover 2 and the rectangular frame 3 are locked and fixed by the locking assembly 8: the bolt 8462 in the screw groove 8461 is rotated, the bolt 8462 is threadedly engaged with the screw ring 8464, and is pushed axially along the screw groove 8461. The end of the bolt 8462 abuts against the side plate 8467, thereby pushing the spiral strip 8466 to move axially. The spiral strip 8466 and the spiral groove of the vertical rod 8465 form a spiral abutment, thereby driving the vertical rod 8465 to rotate. The vertical rod 8465 is then connected to the chain 8468 through the sprocket 8469, which transmits the rotational force to the rotating rod 844, causing the rotating rod 844 to rotate on the fixed plate 845. At the same time, the torsion spring 847 forms elastic storage force. The rotation of the rotating rod 844 drives the rotating bar 841 to rotate synchronously. The groove 842 on the rotating bar 841 slides with the pin 843, causing the pin 843 to slide inside the groove 4. The pin 843 drives the abutment 83 to slide axially and move towards the abutment groove 82 of the connecting plate 81 until the inclined chamfer of the abutment 83 abuts against the inclined chamfer of the abutment groove 82. This inclined abutment action forms a pulling force on the fixed frame 5 through the connecting plate 81, further tightening the shell cover 2, making the sealing gasket 9 fit more tightly against the end face of the rectangular frame 3. At the same time, the slide tube 85 slides axially along the fixed sleeve 86 with the abutment 83, and the abutment ring 87 moves synchronously within the fixed sleeve 86, limiting the movement of the slide tube 85 and the abutment 83. The cooperation between the bolt 8462 and the side support plate 8463 limits the spiral bar 8466, maintaining the stability of the abutment 83 against the abutment groove 82.

[0030] During battery charging and discharging, when the internal alkaline electrolyte expands, the expanding electrolyte exerts pressure on the slide plate 810 in the slide groove 89, pushing the slide plate 810 to slide along the slide groove 89 and compressing the compression spring 812. After the air in the slide groove 89 is compressed, it enters the interior of the fixed sleeve 86 and the slide tube 85 through the air hole 88, forming a pneumatic thrust to push the slide tube 85 to slide axially along the fixed sleeve 86. The slide tube 85 further pushes the abutment 83 to tightly abut against the groove 82, improving the stability of the connection between the shell cover 2 and the rectangular frame 3, offsetting the stress caused by the expansion of the electrolyte, and preventing the shell 1 and shell cover 2 from detaching due to stress and electrolyte leakage. When the electrolyte contracts, the compression spring 812 elastically rebounds and pushes the slide plate 810 back to its original position, the air pressure in the slide groove 89 recovers, and the slide tube 85 and the abutment 83 slightly reset with the change of air pressure, maintaining contact while avoiding excessive compression that could cause component wear, thus achieving elastic stress compensation.

[0031] When the cover 2 needs to be disassembled for internal maintenance, the bolt 8462 is rotated in the reverse direction. The bolt 8462 retracts axially along the threaded groove 8461, releasing the pushing limit on the spiral bar 8466. The torsion spring 847 rebounds elastically to drive the rotating rod 844 to rotate in the reverse direction and reset. The rotating rod 844 drives the vertical rod 8465 to rotate in the reverse direction through the transmission of the sprocket 8469 and the chain 8468, so that the spiral bar 8466 is axially reset. At the same time, the rotating rod 844 drives the rotating bar 841 to rotate in the reverse direction and reset. The slot 842 and the pin 843 cooperate to pull the abutment 83 out of the slot 82. The slide tube 85 resets axially along the fixed sleeve 86 with the abutment 83. The abutment ring 87 moves synchronously in the fixed sleeve 86. The locking effect of the locking assembly 8 is released. At this time, the cover 2 can be directly removed from the end of the housing 1 to complete the disassembly, which greatly reduces the difficulty and cost of subsequent maintenance. The filling port 10 on the cover 2 is used to fill alkaline electrolyte into the casing 1. After filling, the filling port 10 can be sealed. The explosion-proof valve 11 inside the filling port 10 can open to release pressure when the internal pressure of the battery rises abnormally, so as to prevent the battery from exploding and improve the safety of battery use.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cover sealing structure for a sodium-ion battery, comprising a housing (1), characterized in that: The outer surface of the housing (1) is provided with a sealing mechanism, which includes a housing cover (2). The housing cover (2) is located outside the housing (1). A rectangular frame (3) is movably connected to the outer surface of the housing cover (2). One end of the rectangular frame (3) is fixedly connected to one end of the housing (1). A groove (4) is opened at the other end of the rectangular frame (3). A fixed frame (5) is fixedly connected to the outer surface of the housing cover (2). The outer surface of the fixed frame (5) is movably connected to the inside of the groove (4). A flexible plate (6) is fixedly connected to both sides of the outer surface of the fixed frame (5). A stop plate (7) is movably connected to the outer surface of both sides of the flexible plate (6). The outer surfaces of the two stop plates (7) are fixedly connected to both sides inside the groove (4). A sealing gasket (9) is fixedly connected to the outer surface of the housing cover (2). The outer surface of the sealing gasket (9) is movably connected to the other end of the rectangular frame (3).

2. The cover sealing structure for a sodium-ion battery according to claim 1, characterized in that: The body of the shell cover (2) has a through filling port (10), and an explosion-proof valve (11) is installed inside the filling port (10).

3. The cover sealing structure for a sodium-ion battery according to claim 1, characterized in that: The rectangular frame (3) is provided with a locking assembly (8) on its exterior. The locking assembly (8) includes a connecting plate (81). The outer surface of the connecting plate (81) is fixedly connected to the outer surface of the fixed frame (5). The body of the connecting plate (81) is provided with a groove (82). The groove (82) is movably connected with a head (83). The outer surface of the head (83) is movably connected to the interior of the groove (4). The outer surface of the head (83) is fixedly connected with a slide tube (85). The outer surface of the slide tube (85) is slidably connected with a fixed sleeve (86). One end of the fixed sleeve (86) is fixedly connected to the interior of the groove (4). One end of the slide tube (85) is fixedly connected with a stop ring (87). The outer surface of the stop ring (87) is movably connected to the interior of the fixed sleeve (86).

4. The cover sealing structure for a sodium-ion battery according to claim 3, characterized in that: The fixed sleeve (86) has an internal air hole (88) connected to the inside. The air hole (88) is opened on the inner wall of the groove (4). The air hole (88) is connected to the inside of the sliding groove (89). The sliding groove (89) is opened on the inner wall of the rectangular frame (3). One end of the sliding tube (85) and the outer surface of the abutment ring (87) are slidably connected to the inside of the sliding groove (89) through the air hole (88). The sliding plate (810) is slidably connected to the inside of the sliding groove (89). The outer surface of the sliding plate (810) abuts against two arc strips (811). The outer surfaces of the two arc strips (811) are fixedly connected to the inside of the sliding groove (89). The outer surface of the sliding plate (810) is fixedly connected to a compression spring (812). One end of the compression spring (812) is fixedly connected to the inside of the sliding groove (89).

5. The cover sealing structure for a sodium-ion battery according to claim 3, characterized in that: The abutment (83) is provided with a linkage unit (84) on its exterior. The linkage unit (84) includes a rotating bar (841). The outer surface of the rotating bar (841) is rotatably connected to the interior of the groove (4). One end of the rotating bar (841) is provided with a through groove (842). A pin (843) is slidably connected inside the groove (842). The outer surface of the pin (843) is slidably connected to the interior of the groove (4). One end of the pin (843) is fixedly connected to the outer surface of the abutment (83).

6. The cover sealing structure for a sodium-ion battery according to claim 5, characterized in that: One end of the rotating bar (841) is fixedly connected to a rotating rod (844), and a fixed plate (845) is rotatably connected through the outer surface of the rotating rod (844). The outer surface of the fixed plate (845) is fixedly connected to the inside of the groove (4). A torsion spring (847) is sleeved on the outside of the rotating rod (844), and the two ends of the torsion spring (847) are fixedly connected to the outer surfaces of the rotating bar (841) and the fixed plate (845), respectively.

7. The cover sealing structure for a sodium-ion battery according to claim 6, characterized in that: The rotating rod (844) is provided with a drive module (846) on its exterior. The drive module (846) includes a threaded groove (8461). The threaded groove (8461) is opened on the body of the cover (2) and is in a through state. The threaded groove (8461) is threaded with a bolt (8462). One end of the bolt (8462) is rotatably connected to the inside of the groove (4). The bolt (8462) is provided with two support plates (8463) on its exterior. The outer surfaces of the two support plates (8463) are fixedly connected to the inside of the groove (4). A threaded ring (8464) is fixedly connected to the outer surface of one support plate (8463). The inner ring of the threaded ring (8464) is threadedly connected to the outer surface of the bolt (8462).

8. The cover sealing structure for a sodium-ion battery according to claim 7, characterized in that: Another support plate (8463) has a vertical rod (8465) rotatably connected through its body. The vertical rod (8465) has a spiral strip (8466) movably connected through its body. Both ends of the spiral strip (8466) are fixedly connected to clamping plates (8467). The outer surface of one clamping plate (8467) is movably connected to one end of a bolt (8462). A chain (8468) is sleeved on the outside of the spiral strip (8466). Two sprockets (8469) are drivenly connected to the outer surface of the chain (8468). The bodies of the two sprockets (8469) are respectively fixedly connected through the outer surfaces of the vertical rod (8465) and the rotating rod (844).

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