Sealing nail with anti-explosion nick and sodium ion battery

Abstract

The sealing nail comprises a protective cover, the sealing nail is arranged below the protective cover, a cover cap is arranged on the outer side of the protective cover, a positive electrode current collecting disc is arranged below the cover cap, the bottom of the positive electrode current collecting disc is connected with a roll core, a steel shell is arranged on the outer side of the roll core, and the steel shell is connected with the positive electrode current collecting disc. The bottom of the roll core is provided with a negative collector plate, a sealing nail and positive pole welding part is arranged between the sealing nail and the positive collector plate, one side of the positive collector plate is provided with a positive pole and positive collector plate welding part, the outer wall of the sealing nail is provided with a sealing nail explosion-proof nick, and the outer wall of the bottom of the steel shell is provided with a steel shell bottom explosion-proof nick. According to the utility model, the explosion-proof structure is optimized, the safety coefficient is increased, and potential safety hazards are reduced by adopting the nick sealing nail and the two-way exhaust structure. The sealing nail structure is adopted, compared with a cover plate with an independent exhaust hole structure in the current market, one exhaust hole is omitted structurally, and the material cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of ion batteries, in particular to a sealing nail with explosion-proof notches and a sodium ion battery. Background Art

[0002] In recent years, the state's support for the new energy industry, especially the new energy automobile industry, has led to the rapid development of the battery industry. With the increasing popularity of new energy vehicles and supporting facilities, the state's subsidies for new energy vehicles have gradually declined, which has a profound impact on the entire industry. At that time, in addition to the performance of the battery itself, cost is also an issue that every lithium battery manufacturer must face and think about.

[0003] In recent years, with the development of science and technology, the technical difficulties of sodium-ion batteries have been gradually overcome, and the sodium-electricity industry is about to usher in spring. Compared with lithium, sodium is a relatively abundant resource on the earth, cheaper and easier to obtain than lithium, and sodium-ion batteries have better performance in low-temperature environments. However, sodium-ion batteries are larger and heavier than lithium-ion batteries, and have greater safety hazards, so it is particularly important for single cells to have a good explosion-proof structure.

[0004] Compared with square and soft-pack batteries, cylindrical batteries have the advantages of mature technology, high degree of automation, low cost and high safety factor. Therefore, sodium-ion cylindrical batteries have the advantages of low cost, high safety factor and good low-temperature performance.

[0005] In view of this, research and improvement are carried out on the existing problems, and a sealing nail and a sodium ion battery with explosion-proof notches are provided, which have a reasonable structural design, mainly optimize the structure of the sodium ion cylindrical battery, and add a new explosion-proof and two-way air release structure, so as to achieve the purpose of improving the safety factor. The purpose is to solve the problem and improve the practical value through this technology. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a sealing nail with explosion-proof notches and a sodium ion battery.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a sealing nail with explosion-proof notches and a sodium ion battery, comprising a protective cover, a sealing nail is arranged below the protective cover, a cap is arranged on the outside of the protective cover, a positive current collecting disk is arranged below the cap, a winding core is connected to the bottom of the positive current collecting disk, a steel shell is arranged on the outside of the winding core, a negative current collecting disk is arranged at the bottom of the winding core, an insulating tape is arranged on the outside of the winding core, a sealing nail and a positive pole welding point is arranged between the sealing nail and the positive current collecting disk, a positive pole and a positive current collecting disk welding point is arranged on one side of the positive current collecting disk, a sealing nail explosion-proof notch is arranged on the outer wall of the sealing nail, and a steel shell bottom explosion-proof notch is arranged on the outer wall of the steel shell bottom.

[0008] As a further description of the above technical solution:

[0009] The sealing pin is movably connected inside the protective cover, and the cover cap and the sealing pin are assembled at the welding point between the sealing pin and the positive electrode pole and laser welded. The sealing pin is made of aluminum, the cover cap is made of metal iron, and the protective cover is made of PP.

[0010] As a further description of the above technical solution:

[0011] The positive electrode current collecting disc is welded on the top of the winding core, and the negative electrode current collecting disc is welded on the bottom of the winding core. The positive electrode current collecting disc has the same size as the negative electrode current collecting disc, and the steel shell is fixedly installed on the outside of the winding core.

[0012] As a further description of the above technical solution:

[0013] The winding core and the cap are assembled by laser welding at the welding position of the positive electrode column and the positive current collecting disk, and the insulating tape is bonded to the outer side of the winding core.

[0014] As a further description of the above technical solution:

[0015] The steel shell is welded to the cover cap, and a groove is provided in the middle of the cover cap, and the groove is circular in shape.

[0016] As a further description of the above technical solution:

[0017] The explosion-proof notch of the sealing nail is integrally connected to the surface of the sealing nail, and the explosion-proof notch of the bottom of the steel shell is integrally connected to the surface of the steel shell.

[0018] The utility model has the following beneficial effects:

[0019] In the utility model, the explosion-proof structure is optimized, the safety factor is increased, and the notched sealing nails and the two-way exhaust structure are adopted to reduce the potential safety hazards.

[0020] The sealing nail structure is adopted. Compared with the cover plate with a single exhaust hole structure currently on the market, it has one less exhaust hole in the structure, thus reducing material costs.

[0021] The combination of notched sealing nails and notched steel shell has the main function of forming a double air-release structure, which greatly increases the safety factor. After the steel shell breaks at the notch under a certain pressure, the battery is in an open-circuit state and no longer produces gas, further reducing the risk.

[0022] The positive electrode collector plate and the cap are laser welded. The main function is to transform the traditional mechanical contact welding of the riveted structure into an integrated connection, thereby reducing the internal resistance of the entire cover.

[0023] A protective cover is added to the top of the cap, the main function of which is to enhance the pressure and impact resistance of the sealing pin, thereby reducing the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a sealing nail with explosion-proof notches and a sodium ion battery proposed by the utility model;

[0025] Figure 2 This is a schematic plan view of a sealing nail with explosion-proof notches and a sodium ion battery proposed by the utility model;

[0026] Figure 3 This is an enlarged view of the A part of a sealing nail with explosion-proof notches and a sodium ion battery proposed by the utility model;

[0027] Figure 4 This is an enlarged view of the sealing nail with explosion-proof notches and part B of a sodium ion battery proposed by the utility model.

[0028] Legend:

[0029] 1. Protective cover; 2. Sealing nail; 3. Cap; 4. Insulating tape; 5. Positive current collector; 6. Winding core; 7. Negative current collector; 8. Steel shell; 9. Welding point between sealing nail and positive pole; 10. Welding point between positive pole and positive current collector; 11. Explosion-proof notch on sealing nail; 12. Explosion-proof notch on bottom of steel shell. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model; the terms "first", "second" and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Reference Figure 1-4 , the utility model provides an embodiment: a sealing nail with explosion-proof notches and a sodium ion battery, comprising a protective cover 1, a sealing nail 2 is arranged below the protective cover 1, a cap 3 is arranged on the outside of the protective cover 1, a positive current collecting disk 5 is arranged below the cap 3, a winding core 6 is connected to the bottom of the positive current collecting disk 5, a steel shell 8 is arranged on the outside of the winding core 6, a negative current collecting disk 7 is arranged at the bottom of the winding core 6, an insulating tape 4 is arranged on the outside of the winding core 6, a sealing nail and positive pole welding point 9 is arranged between the sealing nail 2 and the positive current collecting disk 5, a positive pole and positive current collecting disk welding point 10 is arranged on one side of the positive current collecting disk 5, a sealing nail explosion-proof notch 11 is arranged on the outer wall of the sealing nail 2, and a steel shell bottom explosion-proof notch 12 is arranged on the outer wall of the bottom of the steel shell 8.

[0033] In the present invention, the sealing nail 2 is movably connected to the inside of the protective cover 1, and the cap 3 and the sealing nail 2 are assembled at the welding point 9 between the sealing nail and the positive pole for laser welding. The sealing nail 2 is made of aluminum, the cap 3 is made of metal iron, and the protective cover 1 is made of PP. The aluminum sealing nail 2 has good electrical conductivity, which can ensure the smooth flow of current, while reducing resistance and energy consumption. The metal iron cap 3 has strong antioxidant properties, which can effectively prevent the sealing nail 2 from corroding during long-term use.

[0034] The protective cover 1 is made of PP material, has excellent heat resistance and impact resistance, can maintain stability in high temperature and harsh environment, and prolong the service life of the sealing nail 2.

[0035] Furthermore, the positive current collecting disc 5 is welded on the top of the winding core 6 , and the negative current collecting disc 7 is welded on the bottom of the winding core 6 . The positive current collecting disc 5 has the same size as the negative current collecting disc 7 , and the steel shell 8 is fixedly mounted on the outside of the winding core 6 .

[0036] Furthermore, the winding core 6 and the cap 3 are assembled by laser welding at the welding point 10 between the positive electrode column and the positive current collecting disk, and the insulating tape 4 is bonded to the outer side of the winding core 6 .

[0037] Furthermore, the steel shell 8 is welded to the cap 3, and the cap 3 has a groove in the middle, and the groove is circular in shape.

[0038] Furthermore, the sealing nail explosion-proof notch 11 is integrally connected to the surface of the sealing nail 2 , and the steel shell bottom explosion-proof notch 12 is integrally connected to the surface of the steel shell 8 .

[0039] Working principle and usage process:

[0040] The working principle of this kind of sealing nail and sodium-ion battery with explosion-proof notches is mainly achieved through special structure and material design to achieve efficient and safe operation of the battery. The sealing nail 2 is made of aluminum, which has good conductivity and oxidation resistance, and is welded to the positive electrode collector 5 to form a circuit path. The cap 3 and the protective cover 1 are respectively located above and below the sealing nail 2 to protect the internal components. The layout and welding method of the positive electrode collector 5, the winding core 6, the negative electrode collector 7 and the steel shell 8 ensure the stability and safety of the battery.

[0041] In terms of the use process, the cap 3 and the sealing pin 2 are first assembled at the welding point 9 between the sealing pin and the positive electrode column and fixed by laser welding. Then the winding core 6 and the cap 3 are assembled and fixed by laser welding at the welding point 10 between the positive electrode column and the positive current collector. Next, the steel shell 8 is fixedly installed on the outside of the winding core 6 to form a complete battery structure. Finally, the insulating tape 4 is bonded to the outside of the winding core 6 to play an insulating and protective role.

[0042] In terms of explosion-proof design, the outer wall of the sealing nail 2 is provided with a sealing nail explosion-proof notch 11, and the outer wall of the bottom of the steel shell 8 is provided with a steel shell bottom explosion-proof notch 12. During the use of the battery, if it encounters abnormal conditions such as overcharging and discharging, short circuit, etc., the explosion-proof notch will play a role, rupture in time, release pressure, and prevent the battery from exploding.

[0043] 1. Laser weld the positive electrode of the winding core and the positive electrode current collector;

[0044] 2. Laser weld the negative electrode of the winding core and the negative electrode current collector;

[0045] 3. Stick the insulating tape to the core;

[0046] 4. Assemble the winding core and the cap and perform laser welding at the welding point between the positive electrode column and the positive current collector;

[0047] 5. Assemble the cap and the sealing pin and perform laser welding at the welding point between the sealing pin and the positive electrode column;

[0048] 6. Assemble the protective cover and the cap;

[0049] 7. Assemble the coil core and the steel shell at the bottom of the steel shell and perform laser penetration welding;

[0050] 8. Laser weld the connection between the steel shell and the cap.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing nail with explosion-proof notches and a sodium ion battery, comprising a protective cover (1), characterized in that: A sealing nail (2) is arranged below the protective cover (1), a cap (3) is arranged on the outside of the protective cover (1), a positive electrode current collecting disc (5) is arranged below the cap (3), a winding core (6) is connected to the bottom of the positive electrode current collecting disc (5), a steel shell (8) is arranged on the outside of the winding core (6), a negative electrode current collecting disc (7) is arranged at the bottom of the winding core (6), an insulating tape (4) is arranged on the outside of the winding core (6), a sealing nail and positive electrode column welding point (9) is arranged between the sealing nail (2) and the positive electrode current collecting disc (5), a positive electrode column and positive electrode current collecting disc welding point (10) is arranged on one side of the positive electrode current collecting disc (5), a sealing nail explosion-proof notch (11) is arranged on the outer wall of the sealing nail (2), and a steel shell bottom explosion-proof notch (12) is arranged on the outer wall of the bottom of the steel shell (8).

2. The sealing nail with explosion-proof notches and the sodium ion battery according to claim 1, characterized in that: The sealing pin (2) is movably connected to the inside of the protective cover (1); the cover cap (3) and the sealing pin (2) are assembled at a welding point (9) between the sealing pin and the positive electrode column and laser welded; the sealing pin (2) is made of aluminum, the cover cap (3) is made of metal iron, and the protective cover (1) is made of PP.

3. The sealing nail with explosion-proof notches and the sodium ion battery according to claim 1, characterized in that: The positive electrode current collecting disc (5) is welded to the top of the winding core (6), and the negative electrode current collecting disc (7) is welded to the bottom of the winding core (6). The positive electrode current collecting disc (5) and the negative electrode current collecting disc (7) have the same size, and the steel shell (8) is fixedly mounted on the outside of the winding core (6).

4. The sealing nail with explosion-proof notches and the sodium ion battery according to claim 1, characterized in that: The winding core (6) and the cap (3) are assembled by laser welding at the welding point (10) between the positive electrode column and the positive current collecting plate, and the insulating tape (4) is bonded to the outside of the winding core (6).

5. The sealing nail with explosion-proof notches and the sodium ion battery according to claim 1, characterized in that: The steel shell (8) is welded to the cover cap (3), and the cover cap (3) has a groove in the middle, and the groove is circular in shape.

6. The sealing nail with explosion-proof notches and the sodium ion battery according to claim 1, characterized in that: The sealing nail explosion-proof notch (11) is integrally connected to the surface of the sealing nail (2), and the steel shell bottom explosion-proof notch (12) is integrally connected to the surface of the steel shell (8).

Images