A sodium-ion cylindrical battery

Abstract

The utility model discloses a kind of sodium ion cylindrical batteries, one end of shell is open end, the other end is closed end, and closed end is provided with mounting hole;The pole lug of the both ends of electric core is respectively connected with first current collector and second current collector, screw pole column is connected on first current collector, screw pole column insulation passes through mounting hole and is connected with nut to outside of shell, insulating sheet is equipped between first current collector and shell, nut and shell are insulatedly connected, second current collector is connected with shell, second current collector is also provided with liquid injection hole, and liquid injection hole is sealed by sealing membrane;Cover plate is connected with shell open end, and cover plate or shell side wall is provided with anti-explosion notch.A useful effect: the utility model pole column is directly connected with current collector, small space is occupied in shell, screw pole column is used, the fixing between screw pole column and shell is realized by nut, anti-explosion notch is set on cover plate or shell side wall, when the pressure in battery shell exceeds bearing pressure, anti-explosion notch breaks first and releases pressure, reduce safety risk.

Description

Technical Field

[0001] This utility model relates to the field of sodium-ion battery technology, specifically to a sodium-ion cylindrical battery. Background Technology

[0002] With the development of lithium-ion battery technology, the shortage of lithium resources and the high cost of lithium-ion batteries have become important factors restricting its development. Compared with lithium, sodium is a more abundant resource on Earth, cheaper and easier to obtain. Sodium-ion batteries also have better performance in low-temperature environments. Therefore, given the scarcity of lithium resources and the high cost of lithium-ion batteries, people have been developing sodium-ion batteries.

[0003] Currently, most sodium-ion cylindrical batteries follow the structure of traditional lithium batteries. For example, the aluminum-cased monopolar cylindrical sodium-ion battery with Chinese utility model patent CN223230426U has a negative electrode tab connected to a busbar, which in turn is connected to the negative electrode post via an adapter. This adapter, bent within the battery casing, occupies space and hinders the improvement of battery energy density. Furthermore, the terminals and cover plates of current sodium-ion batteries are typically connected by riveting, increasing battery costs. In addition, sodium-ion batteries differ from lithium batteries in their material systems and gas generation characteristics, resulting in greater safety hazards compared to lithium-ion batteries. This necessitates sodium-ion batteries possessing excellent explosion-proof and pressure-relief capabilities. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sodium-ion cylindrical battery in which the terminals are directly connected to the current collector without the need for an adapter plate. This design minimizes the space occupied inside the casing. The battery uses screw terminals, which are fixed to the casing with nuts, eliminating the need for riveting. Explosion-proof grooves are provided on the cover or side wall of the casing. When the pressure inside the battery casing exceeds the withstand pressure, the explosion-proof grooves will rupture and release pressure first, preventing the battery from exploding and reducing safety risks.

[0005] The purpose of this utility model is achieved through the following technical measures: a sodium-ion cylindrical battery, comprising: a casing, one end of which is an open end and the other end is a closed end, and the closed end has a mounting hole; a battery cell, which is disposed inside the casing, with tabs at both ends of the battery cell respectively connected to a first current collector and a second current collector, a screw terminal connected to the first current collector, the screw terminal insulatingly passing through the mounting hole to the outside of the casing and connected to a nut disposed on the outside of the casing, an insulating sheet provided between the first current collector and the casing, the nut being insulatedly connected to the casing, the second current collector being connected to the casing, and the second current collector also having a liquid injection hole, the liquid injection hole being sealed by a sealing membrane; a cover plate, which is connected to the open end of the casing for sealing the casing; the cover plate or the side wall of the casing has explosion-proof markings.

[0006] In some embodiments, when the cover plate is provided with explosion-proof markings, the explosion-proof markings include a closed line marking and multiple open line markings, and each of the open line markings and the closed line marking has at least one intersection point.

[0007] In some embodiments, when the sidewall of the housing is provided with explosion-proof grooves, at least two sets of groove groups are provided on the sidewall of the housing. Each set of grooves includes multiple groove units. The groove unit is one or more of closed line grooves and open line grooves. Each set of grooves has at least one intersection point. The intersection point is at least the intersection point of two groove lines. The groove lines belong to the same groove unit or different groove units.

[0008] In some embodiments, multiple sets of notches are spaced apart around the circumference of the cylindrical battery.

[0009] In some embodiments, the notch group is located on the upper or lower part of the sidewall of the cylindrical battery.

[0010] In some embodiments, the sealing film is one of PET film, PP film, PE film and aluminum-plastic film.

[0011] In some embodiments, the screw post includes a stud and a positioning platform, the bottom of the positioning platform is connected to the first collector plate, the top of the positioning platform is connected to the stud, and the radial cross-section of the positioning platform is non-circular.

[0012] In some embodiments, the radial cross-sectional shape of the housing mounting hole matches the radial cross-sectional shape of the mounting platform.

[0013] In some embodiments, an insulating pad is provided between the nut and the housing, and the insulating pad is integrated with the nut.

[0014] In some embodiments, a sealing gasket is provided between the screw post and the housing.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: This utility model proposes a sodium-ion cylindrical battery where the terminals are directly connected to the current collector, eliminating the need for adapter plates. This reduces the space occupied within the casing, which is beneficial for improving battery energy density. Furthermore, it eliminates the need for riveting to connect the terminals to the casing, using screw terminals and securing them to the casing with nuts. Simultaneously, explosion-proof grooves are provided on the cover plate or casing sidewalls. When the internal pressure of the battery casing exceeds the withstand pressure, the explosion-proof grooves will rupture first to release pressure, preventing battery explosion and reducing safety risks. In addition, multiple grooves are provided, with at least one intersection point forming a stress concentration point. This stress concentration point is more prone to rupture first, increasing the rupture sensitivity at the intersection point. The screw terminals are equipped with non-circular cross-section locking platforms that mate with the casing mounting holes, facilitating the positioning of the casing and screw terminals. This also prevents rotation of the terminals when tightening the nuts, simplifying assembly.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the first collector plate and the screw pole.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the pole end.

[0020] Figure 4 This is a schematic diagram of the structure of the scoring on the cover plate.

[0021] Figure 5 This is a structural diagram of the sidewall markings. Figure 1 .

[0022] Figure 6 This is a structural diagram of the sidewall markings. Figure 2 .

[0023] Figure 7 This is a structural diagram of the sidewall markings. Figure 3 .

[0024] Figure 8 This is a structural diagram of the sidewall markings. Figure 4 .

[0025] Among them, 1. Nut, 2. Insulating pad, 3. Insulating sheet, 4. First current collector, 5. Battery cell, 6. Housing, 7. Second current collector, 8. Cover plate, 9. Stud, 10. Positioning platform, 11. Sealing gasket, 12. Closed line groove, 13. Open line groove. Detailed Implementation

[0026] like Figures 1 to 8As shown, a sodium-ion cylindrical battery includes: a housing 6, one end of which is open and the other end is closed, with a mounting hole at the closed end; the housing 6 contains a cell housing space; a cell 5 is disposed within the housing 6, with a first current collector 4 and a second current collector 7 welded to its two ends; a screw post welded to the first current collector 4, the screw post extending insulatedly through the mounting hole to the outside of the housing 6 and connected to a nut 1 located on the outside of the housing 6; an insulating sheet 3 is provided between the first current collector 4 and the housing 6; the nut 1 is insulatedly connected to the housing 6; the second current collector 7 is connected to the housing 6 and has an injection hole sealed by a sealing membrane; and a cover plate 8 is connected to the open end of the housing 6 for sealing the housing 6. The cover plate 8 or the side wall of the housing 6 has explosion-proof markings. This invention features a direct connection between the terminal post and the current collector, eliminating the need for an adapter plate. This results in a smaller internal space occupied by the casing 6, which is beneficial for improving battery energy density. Furthermore, it eliminates the need for riveting between the terminal post and the casing 6, employing screw-type terminal posts secured to the casing 6 by nuts 1. Additionally, explosion-proof grooves are provided on the cover plate 8 or the side wall of the casing 6. When the internal pressure of the battery casing 6 exceeds its withstand pressure, the explosion-proof grooves will rupture first to release pressure, preventing battery explosion and reducing safety risks.

[0027] In some embodiments, when the cover plate 8 is provided with explosion-proof markings, the explosion-proof markings include a closed line marking 12 and multiple open line markings 13, and each of the open line markings 13 and the closed line markings 12 has at least one intersection point. The intersection point of the markings is more prone to stress concentration than other points of the markings, forming a stress concentration point. The stress concentration point is more likely to break first, thus increasing the breakage sensitivity at the intersection point.

[0028] Further preferably, the closed line scribing 12 is a circular scribing, and one end of the open line scribing 13 intersects with the closed line scribing 12, while the other end extends towards the outside of the battery. For example... Figure 4 As shown, more preferably, the circular notch is located at the center of the cover plate 8. The circular notch and the open line notch 13 form multiple initial fracture points. When the pressure reaches the fracture threshold, it is easy to fracture simultaneously from multiple initial fracture points and tear along the circular notch, forming a fracture gap and quickly releasing pressure.

[0029] In some embodiments, when the sidewall of the housing 6 is provided with explosion-proof grooves, at least two sets of groove groups are provided on the sidewall of the housing 6. Each set of groove groups includes multiple groove units. The groove unit is one or more of closed line grooves 12 and open line grooves 13. Each set of grooves has at least one intersection point. The intersection point is at least the intersection point of two groove lines. The groove lines belong to the same groove unit or different groove units.

[0030] It should be noted that the closed line scribing 12 is a line scribing that is connected end to end, while the open line scribing 13 is a line scribing that is not connected end to end. This utility model does not specifically limit the shape formed by the closed line scribing 12; the closed line scribing 12 can form a circle, triangle, rectangle, fan shape, or other shapes. This utility model also does not specifically limit the straightness or curvature of the open line scribing 13; the open line scribing 13 can be a straight line scribing, a broken line scribing, a curved line scribing, etc. This utility model also does not specifically limit whether any single scribing line in the closed line scribing 12 or the open line scribing 13 has an intersection point formed by its own curvature. For example, as... Figure 5 As shown, the scoring group on the sidewall of the housing 6 includes two semi-circular open scoring lines 13. Figure 6 As shown, the scoring group on the sidewall of the housing 6 includes two straight open scoring lines 13. Figure 7 As shown, the scoring group on the sidewall of the housing 6 includes three straight open scoring lines 13. (As...) Figure 8 As shown, the groove group on the side wall of the housing 6 includes two curved open line grooves 13 and one straight open line groove 13.

[0031] In some embodiments, multiple sets of notches are spaced apart around the circumference of the cylindrical battery. More preferably, there are two sets of notches, which are symmetrically distributed around the central axis of the battery.

[0032] In some embodiments, the notch group is located on the upper or lower part of the sidewall of the cylindrical battery.

[0033] In some embodiments, the sealing film is one of PET film, PP film, PE film and aluminum-plastic film.

[0034] In some embodiments, the screw post includes a stud 9 and a positioning platform 10. The bottom of the positioning platform 10 is welded to the first collector plate 4, and the top of the positioning platform 10 is connected to the stud 9. The radial cross-section of the positioning platform 10 is non-circular. Further, the radial cross-sectional shape of the mounting hole in the housing 6 matches the radial cross-sectional shape of the positioning platform 10. Specifically, the radial cross-section of the positioning platform 10 can be elliptical, oblong, or a polygon such as a triangle, quadrilateral, pentagon, or hexagon, or a polygon with curves. Matching the cross-section of the positioning platform 10 with the mounting hole facilitates the positioning of the housing 6 and the screw post, and also prevents rotation of the post when tightening the nut 1, thus facilitating assembly.

[0035] In some embodiments, an insulating pad 2 is provided between the nut 1 and the housing 6, and the insulating pad 2 is integrated with the nut 1.

[0036] In some embodiments, a sealing gasket 11 is provided between the screw post and the housing 6 to achieve insulation and sealing between the screw post and the housing 6.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A sodium-ion cylindrical battery, characterized in that, The sodium-ion cylindrical battery includes: The housing has an open end and a closed end, with a mounting hole provided at the closed end; The battery cell is housed within a housing. A first current collector and a second current collector are connected to tabs at both ends of the battery cell. A screw post is connected to the first current collector, and the screw post extends through an insulating hole to the outside of the housing and is connected to a nut located on the outside of the housing. An insulating sheet is provided between the first current collector and the housing. The nut is insulated from the housing. The second current collector is connected to the housing. A liquid injection hole is also provided on the second current collector, and the liquid injection hole is sealed by a sealing membrane. A cover plate, which is connected to the opening end of the housing, is used to seal the housing; The cover plate or the side wall of the shell is provided with explosion-proof markings.

2. The sodium-ion cylindrical battery according to claim 1, characterized in that: When the cover plate is provided with explosion-proof markings, the explosion-proof markings include a closed line marking and multiple open line markings, and each of the open line markings and the closed line marking has at least one intersection point.

3. The sodium-ion cylindrical battery according to claim 1, characterized in that: When the sidewall of the housing is provided with explosion-proof grooves, the sidewall of the housing is provided with at least two sets of grooves. Each set of grooves includes multiple groove units. The groove unit is one or more of closed line grooves and open line grooves. Each set of grooves has at least one intersection point. The intersection point is at least the intersection point of two groove lines. The groove lines belong to the same groove unit or different groove units.

4. The sodium-ion cylindrical battery according to claim 3, characterized in that: Multiple sets of notches are spaced apart around the circumference of the cylindrical battery.

5. The sodium-ion cylindrical battery according to claim 3, characterized in that: The notch group is located on the upper or lower part of the sidewall of the cylindrical battery.

6. The sodium-ion cylindrical battery according to claim 1, characterized in that: The sealing film is one of PET film, PP film, PE film and aluminum-plastic film.

7. The sodium-ion cylindrical battery according to claim 1, characterized in that: The screw pole includes a stud and a positioning platform. The bottom of the positioning platform is connected to the first collector plate, and the top of the positioning platform is connected to the stud. The radial cross-section of the positioning platform is non-circular.

8. The sodium-ion cylindrical battery according to claim 7, characterized in that: The radial cross-sectional shape of the housing mounting hole matches the radial cross-sectional shape of the positioning platform.

9. The sodium-ion cylindrical battery according to claim 1, characterized in that: An insulating pad is provided between the nut and the housing, and the insulating pad is integrated with the nut.

10. The sodium-ion cylindrical battery according to claim 1, characterized in that: A sealing gasket is provided between the screw post and the housing.

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