Sodium ion battery pack

Abstract

The utility model relates to the technical field of sodium-ion batteries, and discloses a sodium-ion battery pack which comprises a hollow shell, a sodium-ion battery module arranged in the hollow shell, end covers for sealing openings at two ends of the hollow shell, and charging and discharging interfaces arranged on the end covers and electrically connected with the sodium-ion battery module, a plurality of semi-closed threaded holes extending towards the interior of the end cover are evenly formed in the side outer wall face of the end cover at intervals, a plurality of screw holes penetrating through the hollow shell are formed in the positions, close to the end, of the hollow shell, the multiple semi-closed threaded holes correspond to the multiple screw holes in a one-to-one mode, and the end cover and the hollow shell are tightly connected through screws. The side outer wall face of the end cover is further provided with an annularly-distributed groove, and a sealing ring matched with the groove in shape is arranged in the groove. The sodium ion battery pack can meet the dual requirements on the performance and the safety of the battery pack in an external use scene.

Description

Technical Field

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

[0002] With the booming development of the new energy industry and the continuous growth in demand for clean energy, battery performance and its adaptability in various application scenarios have become a key focus of the industry. Sodium-ion batteries, as an emerging battery technology that has attracted much attention in recent years, can release or store a large amount of electrical energy in a short time, making them suitable for various application scenarios that require rapid charging and discharging.

[0003] However, when sodium-ion batteries are used in battery packs and need to meet the requirements of external use scenarios, sealing is a crucial factor. How to achieve high sealing performance while ensuring the high power operation capability of sodium-ion battery packs is also a problem that needs to be solved in the current application of sodium-ion battery pack technology. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a sodium-ion battery pack that can meet the dual requirements of battery pack performance and safety in external use scenarios.

[0005] To achieve the above objectives, this utility model provides a sodium-ion battery pack, including a hollow shell with openings at both ends, a sodium-ion battery module disposed inside the hollow shell, an end cap that seals the openings at both ends of the hollow shell, and a charging and discharging interface disposed on the end cap and electrically connected to the sodium-ion battery module.

[0006] The end cap has a plurality of semi-closed threaded holes that extend toward the inside of the end cap at equal intervals on its outer side wall. The hollow shell has a plurality of screw holes that penetrate the hollow shell near its end. The plurality of semi-closed threaded holes correspond one-to-one with the plurality of screw holes, and the end cap is tightly connected to the hollow shell by screws.

[0007] The outer side wall of the end cap is also provided with grooves distributed in a ring, and a sealing ring adapted to the shape of the groove is provided in the groove.

[0008] Optionally, the end cap is provided with a mounting hole extending along the thickness direction of the end cap for fixing the charging and discharging interface, and a sealing element is provided between the charging and discharging interface and the end cap.

[0009] Optionally, the sodium-ion battery module includes multiple battery modules, which are connected to each other along the axial direction by a bridging member. Each battery module includes multiple individual sodium-ion cells and cell supports disposed opposite to each of the individual sodium-ion cells. The cell supports are used to fix the multiple individual sodium-ion cells.

[0010] Optionally, a heating film is provided on the outer surface of the battery module.

[0011] Optionally, the sodium-ion battery module further includes a protection board, which is disposed at one end of the sodium-ion battery module.

[0012] Optionally, the sodium-ion battery module further includes a rubber gasket, which is disposed at the other end of the sodium-ion battery module.

[0013] Optionally, an insulating plate distributed in a ring is provided at the edge of the end face away from the sodium-ion battery module.

[0014] The above technical solution provides a sodium-ion battery pack that can adapt to external use scenarios. By setting end caps at both ends of the hollow shell and using screws to tightly connect the end caps to the hollow shell through semi-closed threaded holes and screw holes, the stability and sealing of the battery pack's packaging structure are ensured. The sealing ring set in the annular groove on the outer wall of the end cap further enhances the sealing between the hollow shell and the end cap, ensuring the safety of the sodium-ion battery pack when used in external scenarios. Attached Figure Description

[0015] Figure 1 This is an exploded view of a sodium-ion battery pack provided by this utility model;

[0016] Figure 2 This is a schematic diagram of the end cap structure in this utility model;

[0017] Figure 3 This is an assembly diagram of the sodium-ion battery module in this utility model;

[0018] Figure 4 This is a schematic diagram of the overall structure of a sodium-ion battery pack provided by this utility model.

[0019] Explanation of reference numerals in the attached figures

[0020] 1. Hollow casing; 11. Screw holes; 2. Sodium-ion battery module; 21. Battery module; 211. Single sodium-ion cell; 212. Cell support; 213. Bridging component; 3. End cap; 31. Semi-closed threaded hole; 32. Mounting hole; 33. Groove; 4. Charge / discharge interface; 5. Protection board; 6. Rubber gasket; 7. Insulating board. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0022] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "inner," "outer," etc., indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not 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. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Furthermore, the words "including" or "comprising" as used in this utility model mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility that it also covers other elements.

[0024] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Combination Figure 1 and Figure 2 As shown, this utility model provides a sodium-ion battery pack, including a hollow shell 1 with openings at both ends, a sodium-ion battery module 2 disposed inside the hollow shell 1, an end cap 3 sealing the openings at both ends of the hollow shell 1, and a charging / discharging interface 4 disposed on the end cap 3 and electrically connected to the sodium-ion battery module 2; a plurality of semi-closed threaded holes 31 extending toward the interior of the end cap 3 are evenly and spaced on the outer side wall of the end cap 3; a plurality of screw holes 11 penetrating the hollow shell 1 are provided near the end of the hollow shell 1; the plurality of semi-closed threaded holes 31 correspond one-to-one with the plurality of screw holes 11, and the end cap 3 is tightly connected to the hollow shell 1 by screws; a groove 33 distributed in an annular pattern is also provided on the outer side wall of the end cap 3, and a sealing ring adapted to the shape of the groove 33 is disposed in the groove 33.

[0026] In this invention, the end cap 3 is tightly connected to the hollow housing 1 by screws, ensuring a compact and stable overall structure of the battery pack. The semi-closed threaded hole 31 not only simplifies the assembly process but also further improves the reliability and safety of the connection. When maintenance or replacement of the sodium-ion battery module 2 is required, the end cap 3 can be easily opened by simply unscrewing the screws, without a complicated disassembly process. The annular groove 33 on the outer side wall of the end cap 3 and the matching sealing ring together constitute a highly efficient sealing structure, effectively improving the waterproof and dustproof performance of the battery pack, enabling it to work stably in harsh environments.

[0027] Understandably, the hollow casing 1 of this sodium-ion battery pack can be set to any suitable shape, preferably cylindrical. The cylindrical design makes better use of space, especially in the three-dimensional direction. Compared to a square shape, the corner space of a cylinder can be utilized more effectively. Within the same volume, a cylindrical casing can accommodate more battery cells, increasing the overall energy density of the battery pack. This is particularly important for applications requiring high energy output, such as electric vehicles, electric bicycles, and energy storage systems, thus improving the applicability of sodium-ion battery packs.

[0028] The end caps 3 of this sodium-ion battery pack are typically designed to match the shape of the hollow housing 1 of the battery pack to ensure a tight seal at both ends of the housing openings.

[0029] Preferably, the hollow casing 1 and the end caps 3 are made of aluminum, which is an excellent thermal conductor with outstanding thermal conductivity. Therefore, the hollow casing 1 and the two end caps 3 made of aluminum together constitute a highly efficient heat conduction system, enabling the heat generated inside the battery pack to be quickly and effectively transferred to the external environment of the battery pack.

[0030] Furthermore, both ends of this sodium-ion battery pack are equipped with charging / discharging interfaces 4, which are welded to the end connectors of the sodium-ion battery module 2. These charging / discharging interfaces 4 are crucial channels for energy transfer between the sodium-ion battery pack and an external power source or load. During charging, the external power source supplies energy to the sodium-ion battery pack through the charging / discharging interfaces 4, charging the internal sodium-ion battery module 2. During discharging, the sodium-ion battery pack supplies energy to the external load through the charging / discharging interfaces 4, meeting the power requirements of the equipment.

[0031] The design of the charging and discharging interface 4 of this sodium-ion battery pack fully considers the needs of adaptability and compatibility. By selecting appropriate interface standards and specifications, the compatibility and interchangeability between the sodium-ion battery pack and various external power sources and loads can be ensured. This provides users with more choices and flexibility, meeting the needs of different application scenarios.

[0032] Furthermore, the end cap 3 is provided with a mounting hole 32 extending along the thickness direction of the end cap 3 for fixing the charging / discharging interface 4. A sealing element is provided between the charging / discharging interface 4 and the end cap 3. This design ensures the stability and reliability of the charging / discharging interface 4 on the end cap 3, preventing safety hazards caused by loosening or displacement of the interface. In addition, the sealing element between the charging / discharging interface 4 and the end cap 3 can effectively prevent external moisture, dust, or other contaminants from entering the battery pack.

[0033] It is understood that the connection between the end cap 3 and the charging / discharging interface 4 can be any appropriate method. In this utility model, the outer contour of the charging / discharging interface 4 is consistent with the inner contour of the mounting hole 32 to ensure that the charging / discharging interface 4 can be accurately inserted and fixed in the mounting hole 32. In order to further enhance the stability of the connection, the outer ring of the charging / discharging interface 4 is provided with an annular convex edge, and threaded holes are opened on the annular convex edge. These threaded holes perfectly match the corresponding threaded holes pre-designed on the end cap 3. The fastening connection between the charging / discharging interface 4 and the end cap 3 can be achieved by screwing in the screw.

[0034] In this utility model, such as Figure 3 As shown, the sodium-ion battery module 2 includes multiple battery modules 21, which are connected to each other along the axial direction by a bridging member 213. Each battery module 21 includes multiple individual sodium-ion cells 211 and cell supports 212 disposed opposite to each of the individual sodium-ion cells 211. The cell supports 212 are used to fix the multiple individual sodium-ion cells 211.

[0035] Through modular design, the sodium-ion battery module 2 can be configured with more flexible battery capacity, thereby improving the energy density of the entire battery pack to a certain extent. The use of the cell bracket 212 not only fixes the individual sodium-ion cells 211, but also enhances the connection stability between battery modules 21, so that the entire module can better maintain its structural integrity when subjected to external impact. The bridging component 213 is provided with a connection slot or buckle that matches the structure on the cell bracket 212, so as to connect with adjacent battery modules 21.

[0036] Furthermore, to ensure the working performance of the sodium-ion battery pack in low-temperature environments, a heating film is provided on the outer surface of the battery module 21. When current passes through the heating film, due to the resistance of the heating film, electrical energy is converted into heat energy, thereby raising the temperature of the heating film. This heat is then transferred to the battery module 21, regulating the battery temperature. By preheating or maintaining the temperature of the battery module 21 in low-temperature environments, it is ensured that the battery can operate normally within a suitable temperature range. The heating film, through uniform heat transfer, can effectively increase the overall temperature of the battery module 21, preventing problems such as decreased battery performance, slower charging speed, and reduced range caused by excessively low temperatures. In addition, the heating film can also improve the starting efficiency and stability of the battery module 21 under cold conditions, extend the battery's lifespan, and provide more reliable and efficient energy support for applications such as electric vehicles and energy storage systems.

[0037] Understandably, the heating film can be directly attached to the surface of the battery module 21, or it can be detachably connected to the battery module 21. To ensure safe isolation and efficient heat transfer between the heating film and the battery module 21, insulating and thermally conductive materials are typically used. The insulating material prevents current from directly passing through the contact surface between the heating film and the battery module 21, thus avoiding safety issues such as short circuits. The thermally conductive material enhances the heat transfer efficiency between the heating film and the battery module 21, improving the heating effect.

[0038] In this utility model, in such Figure 1 As shown, in order to monitor the voltage, current, and temperature of the battery pack in real time and ensure that these parameters fluctuate within a safe range, the sodium-ion battery module 2 also includes a protection plate 5, which is disposed at one end of the sodium-ion battery module 2. In this invention, the protection plate 5 is disposed at the negative terminal of the sodium-ion battery module 2. The protection plate 5 may be provided with multiple holes for nickel sheets to pass through, so that when multiple battery modules 21 are connected in series, the negative terminal of the previous battery module 21 can be connected to the positive terminal of the next battery module 21.

[0039] Furthermore, the sodium-ion battery module 2 also includes a rubber gasket 6, which is disposed at the other end of the sodium-ion battery module 2, i.e., at the positive terminal. The rubber gasket 6 is typically made of a material with high insulating properties. These materials have extremely high resistivity, which can effectively prevent current from passing through, thereby playing an insulating role. The rubber gasket 6 is placed between the sodium-ion battery module 2 and the end cap 3, serving as a physical isolation, which can isolate the internal circuitry of the battery module from the external environment, thereby avoiding the risk of short circuits or leakage.

[0040] Similarly, such as Figure 4As shown, an insulating plate 7 is provided in a ring at the edge of the end face of the end cap 3 away from the sodium-ion battery module 2 (negative end) to provide insulation and protection.

[0041] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A sodium-ion battery pack, characterized in that, It includes a hollow shell (1) with openings at both ends, a sodium-ion battery module (2) disposed inside the hollow shell (1), an end cap (3) that seals the openings at both ends of the hollow shell (1), and a charging and discharging interface (4) disposed on the end cap (3) and electrically connected to the sodium-ion battery module (2). The end cap (3) has a plurality of semi-closed threaded holes (31) that extend toward the interior of the end cap (3) evenly and at intervals on its outer side wall. The hollow shell (1) has a plurality of screw holes (11) that penetrate the hollow shell (1) near its end. The plurality of semi-closed threaded holes (31) correspond one-to-one with the plurality of screw holes (11), and the end cap (3) and the hollow shell (1) are tightly connected by screws. The outer side wall of the end cap (3) is also provided with a groove (33) distributed in a ring, and a sealing ring adapted to its shape is provided in the groove (33).

2. The sodium-ion battery pack according to claim 1, characterized in that, The end cap (3) is provided with a mounting hole (32) that extends through the thickness direction of the end cap (3) to fix the charging and discharging interface (4), and a sealing element is provided between the charging and discharging interface (4) and the end cap (3).

3. The sodium-ion battery pack according to claim 1, characterized in that, The sodium-ion battery module (2) includes multiple battery modules (21), which are connected to each other along the axial direction by a bridging member (213). Each battery module (21) includes multiple individual sodium-ion cells (211) and cell supports (212) disposed opposite to each of the individual sodium-ion cells (211). The cell supports (212) are used to fix the multiple individual sodium-ion cells (211).

4. The sodium-ion battery pack according to claim 3, characterized in that, A heating film is provided on the outer surface of the battery module (21).

5. The sodium-ion battery pack according to claim 1, characterized in that, The sodium-ion battery module (2) also includes a protection plate (5), which is disposed at one end of the sodium-ion battery module (2).

6. The sodium-ion battery pack according to claim 5, characterized in that, The sodium-ion battery module (2) also includes a rubber gasket (6), which is disposed at the other end of the sodium-ion battery module (2).

7. The sodium-ion battery pack according to claim 5, characterized in that, An insulating plate (7) is provided at the edge of the end cap (3) away from the sodium-ion battery module (2) in a ring shape.

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