A top cover assembly for a sodium-ion battery

Abstract

The utility model relates to battery top cover technical field discloses a top cover assembly for sodium ion battery, including end cover, both ends of end cover all are provided with electrode assembly, and the middle part of end cover top is provided with explosion -proof diaphragm, and the lower end in the inside of explosion -proof diaphragm is installed with explosion -proof diaphragm, and the top of end cover and located one side of explosion -proof diaphragm is provided with liquid injection hole, and the top of end cover and the top of explosion -proof diaphragm opposite fixedly has buffer cover. This top cover assembly for sodium ion battery is through setting up the buffer space that constitutes by buffer cover, and the integration buffer board, spring buffer mechanism and pressure -relief hole, has changed the pressure -relief mode of traditional explosion -proof diaphragm instantaneous explosion, and the impact force is through the preliminary obstruction of explosion -proof diaphragm, the energy absorption of spring, and finally through the slow release of pressure -relief hole, will the violent instantaneous impact of once into a lasting, controllable gradual pressure -relief process, effectively avoided the violent eruption of high pressure gas and chemical substance.

Description

Technical Field

[0001] This utility model relates to the field of battery top cover technology, and in particular to a top cover assembly for sodium-ion batteries. Background Technology

[0002] Sodium-ion batteries, as an important chemical power source, have shown broad application prospects in energy storage, low-speed electric vehicles, and other fields. However, similar to lithium-ion batteries, sodium-ion batteries can generate a large amount of gas inside under abnormal conditions such as overcharging, short circuits, or thermal runaway, leading to a sudden increase in pressure and posing an explosion risk. Most sodium-ion batteries are equipped with an explosion-proof valve (or explosion-proof membrane) as a core safety pressure relief device. When the internal pressure of the battery exceeds a set threshold, the explosion-proof membrane ruptures instantly, thereby achieving rapid pressure relief and preventing a more violent explosion.

[0003] When the explosion-proof film ruptures, the high-pressure gas and high-temperature chemicals accumulated inside the battery will violently erupt through the pressure relief hole without any buffer. This instantaneous and concentrated energy release will produce a strong impact and may carry electrolyte, active materials and other substances out. The concentrated eruption of flames or high-temperature substances may ignite flammable materials around the battery, leading to a secondary accident. Utility Model Content

[0004] In view of the problem that the existing concentrated eruption of flames or high-temperature substances may ignite flammable materials around the battery, leading to secondary accidents, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a top cover assembly for sodium-ion batteries, which has the purpose of: a battery top cover assembly with progressive pressure relief, so as to alleviate or even eliminate the impact of instantaneous explosion and improve the safety and reliability of the battery.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a top cover assembly for a sodium-ion battery, including an end cover, an electrode assembly at both ends of the end cover, an explosion-proof diaphragm at the top center of the end cover, an explosion-proof diaphragm installed at the lower end of the inside of the explosion-proof diaphragm, an injection hole at the top of the end cover and on one side of the explosion-proof diaphragm, and a buffer cover fixed at the top of the end cover and directly above the explosion-proof diaphragm;

[0007] Both ends of the buffer cover are equipped with buffer components. A buffer plate is fixedly connected between the movable ends of the two buffer components, and the buffer plate is located directly above the explosion-proof diaphragm and spaced one centimeter apart.

[0008] As an improved technical solution, the electrode assembly includes an electrode post mounted on an end cap, with a threaded hole at the center of the top of the electrode post, and protective rings fixed at both ends of the top of the end cap.

[0009] As an improved technical solution, the buffer assembly includes a positioning sleeve fixed to the top of the inner wall of the buffer cover. The positioning sleeve has a T-shaped hole slidably installed through a sliding hole at its bottom end, and the buffer plate is fixed to the bottom end of the T-shaped hole. A buffer spring is sleeved on the vertical end of the T-shaped hole between the buffer plate and the opposite surface of the positioning sleeve.

[0010] As an improved technical solution, pressure relief holes are provided at both ends of the buffer cover, and a sealing diaphragm is provided inside the pressure relief hole. Both ends of the buffer cover are provided with a rupture assembly for puncturing the sealing diaphragm.

[0011] As an improved technical solution, the membrane breaking assembly includes a translation block that is laterally slidably installed inside the explosion-proof diaphragm. A conical column is fixed to one end of the translation block near the sealing diaphragm, and the conical end of the conical column is positioned facing one side of the sealing diaphragm.

[0012] As an improved technical solution, a hole block is welded to the top of the translation block, and a guide post is slidably installed on the hole block through a sliding hole thereon. A return spring is sleeved between the rod end of the guide post and the inner wall surface of the explosion-proof diaphragm and one end face of the hole block.

[0013] As an improved technical solution, the membrane breaking assembly further includes a column fixed to the top of the buffer plate, a first magnetic block fixed to the top of the column, and a second magnetic block embedded in the end face of the translation block away from the conical column, and the opposite faces of the first magnetic block and the second magnetic block are in a state of magnetic repulsion.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are:

[0015] 1. In this utility model, when the explosion-proof diaphragm ruptures and releases pressure, the impact force compresses the buffer spring. Under the elastic action of the buffer spring, the energy of the impact force is absorbed, reducing the intensity of the impact force, and suppressing electrolyte and other related fragments inside the buffer cover, which helps to prevent them from spreading outward and helps to prevent secondary accidents. At the same time, the conical column falls out of the pressure relief hole and resets inside the explosion-proof diaphragm, keeping the pressure relief hole unobstructed. The unobstructed pressure relief hole will release the impact force inside the buffer cover a second time, ensuring that the pressure can be safely released in the end.

[0016] 2. This utility model, by setting up a buffer space composed of a buffer cover and integrating a buffer plate, a spring buffer mechanism, and a pressure relief hole, changes the pressure relief mode of the traditional explosion-proof membrane's instantaneous burst. The impact force is initially blocked by the explosion-proof membrane, absorbed by the spring energy, and finally slowly released through the pressure relief hole, transforming a violent instantaneous impact into a continuous and controllable gradual pressure relief process. This effectively avoids the violent eruption of high-pressure gas and chemical substances, significantly eliminates the impact sensation, and, with the reduced impact force, increases the possibility of electrolyte and other fragments being trapped and settling within the buffer space, thereby reducing the amount of harmful chemical substances splashed to the outside and improving safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is a three-dimensional structural diagram of a top cover assembly for a sodium-ion battery according to the present invention.

[0019] Figure 2 This is a cross-sectional view of the buffer cover of the top cover assembly for a sodium-ion battery according to the present invention.

[0020] Figure 3 This utility model relates to a top cover assembly for a sodium-ion battery. Figure 2 A schematic diagram of the structure at point A in the middle.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. End cap; 2. Pressure relief chamber; 3. Explosion-proof diaphragm; 4. Injection hole; 5. Buffer cover; 6. Protective ring; 7. Electrode post; 8. Threaded hole; 9. Diaphragm breaking assembly; 91. Column; 92. First magnetic block; 93. Second magnetic block; 94. Hole block; 95. Guide post; 96. Return spring; 97. Conical post; 98. Translation block; 10. Pressure relief hole; 11. Sealing diaphragm; 12. Buffer plate; 13. Buffer spring; 14. T-hole; 15. Positioning sleeve. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] Reference Figures 1-3This is the first embodiment of the present invention, which provides a top cover assembly for a sodium-ion battery. This top cover assembly for a sodium-ion battery includes an end cover 1, with electrode assemblies provided at both ends of the end cover 1. An explosion-proof diaphragm 3 is provided in the middle of the top of the end cover 1. An explosion-proof diaphragm 3 is installed at the lower end of the interior of the explosion-proof diaphragm 3. An injection hole 4 is provided on the top of the end cover 1 and on one side of the explosion-proof diaphragm 3. A buffer cover 5 is fixed on the top of the end cover 1 and directly above the explosion-proof diaphragm 3.

[0026] Both ends of the buffer cover 5 are equipped with buffer components. A buffer plate 12 is fixedly connected between the movable ends of the two buffer components. The buffer plate 12 is located directly above the explosion-proof diaphragm 3 and is spaced one centimeter apart. The peripheral surface of the buffer plate 12 is spaced two centimeters apart from the inner wall surface of the buffer cover 5.

[0027] The electrode assembly includes an electrode post 7 mounted on an end cap 1. A threaded hole 8 is provided at the center of the top of the electrode post 7. Protective rings 6 are fixed at both ends of the top of the end cap 1, and the electrode post 7 is located in the inner hole of the protective ring 6.

[0028] The buffer assembly includes a positioning sleeve 15 fixed to the top of the inner wall of the buffer cover 5. The positioning sleeve 15 is slidably fitted with a T-shaped hole 14 through a sliding hole at its bottom end, and the buffer plate 12 is fixed to the bottom end of the T-shaped hole 14. A buffer spring 13 is sleeved on the vertical end of the T-shaped hole 14 between the buffer plate 12 and the opposite face of the positioning sleeve 15. When the impact force passes through the pressure relief chamber 2 and impacts the interior of the buffer cover 5, it will compress the buffer spring 13. Under the elastic action of the buffer spring 13, the energy of the impact force is absorbed, the intensity of the impact force is reduced, and the electrolyte and other related fragments are suppressed inside the buffer cover 5, which helps to prevent them from spreading outward and helps to prevent secondary accidents.

[0029] During use, by setting up a buffer space composed of a buffer cover 5 and integrating a buffer plate 12, a spring buffer mechanism, and a pressure relief hole 10, the pressure relief mode of the traditional explosion-proof membrane that bursts instantly is changed. The impact force is initially blocked by the explosion-proof membrane 3 and absorbed by the energy of the spring, and finally slowly released through the pressure relief hole 10. This transforms a violent instantaneous impact into a continuous and controllable gradual pressure relief process, effectively avoiding the violent eruption of high-pressure gas and chemicals, significantly eliminating the impact sensation. Furthermore, with the reduced impact force, the possibility of electrolyte and other fragments being trapped inside the buffer space is increased, thereby reducing the amount of harmful chemicals splashed to the outside and improving safety.

[0030] Example 2

[0031] Reference Figures 2-3This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: pressure relief holes 10 are provided at both ends of the buffer cover 5, a sealing diaphragm 11 is provided inside the pressure relief hole 10, and a rupture assembly 9 for puncturing the sealing diaphragm 11 is provided at both ends inside the buffer cover 5.

[0032] The membrane breaking assembly 9 includes a translation block 98 that is laterally slidably installed inside the explosion-proof diaphragm 3. A conical column 97 is fixed to one end of the translation block 98 near the sealing diaphragm 11, and the conical end of the conical column 97 is positioned facing one side of the sealing diaphragm 11.

[0033] A hole block 94 is welded to the top of the translation block 98. A guide post 95 is slidably installed on the hole block 94 through a sliding hole. One end of the guide post 95 is fixed to the inner wall of the explosion-proof diaphragm 3. A return spring 96 is sleeved between the rod end of the guide post 95 and the inner wall of the explosion-proof diaphragm 3 and one end face of the hole block 94. Guide strips are installed on both sides of the rod end of the guide post 95. A sliding groove is opened on the hole block 94 for the guide strip to pass through, and the sliding groove is connected to the sliding hole on the hole block 94.

[0034] The membrane breaking assembly 9 also includes a column 91 fixed to the top of the buffer plate 12. A first magnetic block 92 is fixed to the top of the column 91. A second magnetic block 93 is embedded in the end face of the translation block 98 away from the conical column 97, and the opposite face of the first magnetic block 92 and the second magnetic block 93 are in a magnetic repulsive state.

[0035] During use, when the buffer plate 12 moves upward, it will drive the first magnetic block 92 to move upward. When the first magnetic block 92 moves upward, it will gradually face the second magnetic block 93 and repel magnetically. Under the action of magnetic repulsion, the translation block 98 is pushed into the interior of the pressure relief hole 10 and the sealing diaphragm 11 is punctured. At this time, the hole block 94 will compress the reset spring 96.

[0036] As the first magnetic block 92 continues to rise, it and the second magnetic block 93 are in a staggered state. Under the elastic reset action of the reset spring 96, the conical column 97 is dislodged from the inside of the pressure relief hole 10 and reset inside the explosion-proof diaphragm 3, so that the pressure relief hole 10 is unobstructed. The unobstructed state of the pressure relief hole 10 will release the impact force inside the buffer cover 5 for a second time, ensuring that the pressure can be safely released in the end.

[0037] Based on embodiments 1-2, the working principle of this utility model is as follows: When the explosion-proof diaphragm 3 ruptures and releases pressure, the impact force rushes through the pressure relief chamber 2 and impacts the interior of the buffer cover 5. When the impact force enters the interior of the buffer cover 5, it will directly impact the buffer plate 12 and move the buffer plate 12 toward the positioning sleeve 15. During the movement, the buffer plate 12 will compress the buffer spring 13. Under the elastic action of the buffer spring 13, the energy of the impact force is absorbed, reducing the intensity of the impact force.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A top cover assembly for a sodium-ion battery, comprising an end cover (1), characterized in that: Electrode assemblies are provided at both ends of the end cap (1). An explosion-proof diaphragm (3) is provided at the top center of the end cap (1). An explosion-proof diaphragm (3) is installed at the lower end inside the explosion-proof diaphragm (3). An injection hole (4) is provided at the top of the end cap (1) and on one side of the explosion-proof diaphragm (3). A buffer cover (5) is fixed at the top of the end cap (1) and directly above the explosion-proof diaphragm (3). Both ends of the buffer cover (5) are equipped with buffer components. A buffer plate (12) is fixedly connected between the movable ends of the two buffer components. The buffer plate (12) is located directly above the explosion-proof diaphragm (3) and is spaced one centimeter apart.

2. The top cover assembly for a sodium-ion battery according to claim 1, characterized in that: The electrode assembly includes an electrode post (7) mounted on the end cap (1), with a threaded hole (8) at the center of the top of the electrode post (7), and protective rings (6) fixed at both ends of the top of the end cap (1).

3. The top cover assembly for a sodium-ion battery according to claim 2, characterized in that: The buffer assembly includes a positioning sleeve (15) fixed to the top of the inner wall of the buffer cover (5). The positioning sleeve (15) has a T-shaped hole (14) slidably installed through a sliding hole at its bottom end. The buffer plate (12) is fixed to the bottom end of the T-shaped hole (14). A buffer spring (13) is sleeved on the vertical end of the T-shaped hole (14) between the buffer plate (12) and the opposite side of the positioning sleeve (15).

4. A top cover assembly for a sodium-ion battery according to claim 3, characterized in that: The buffer cover (5) has pressure relief holes (10) at both ends. The pressure relief holes (10) are equipped with sealing diaphragms (11) inside. The buffer cover (5) has rupture assemblies (9) at both ends inside for puncturing the sealing diaphragms (11).

5. A top cover assembly for a sodium-ion battery according to claim 4, characterized in that: The membrane breaking assembly (9) includes a translation block (98) that is laterally slidably installed inside the explosion-proof diaphragm (3). A conical column (97) is fixed to one end of the translation block (98) near the sealing diaphragm (11), and the conical end of the conical column (97) is positioned facing one side of the sealing diaphragm (11).

6. A top cover assembly for a sodium-ion battery according to claim 5, characterized in that: The top of the translation block (98) is welded with a hole block (94), and a guide post (95) is slidably installed on the hole block (94) through a sliding hole. A return spring (96) is sleeved on the rod end of the guide post (95) between the inner wall surface of the explosion-proof diaphragm (3) and one end face of the hole block (94).

7. A top cover assembly for a sodium-ion battery according to claim 6, characterized in that: The membrane breaking assembly (9) also includes a column (91) fixed on the top of the buffer plate (12). A first magnetic block (92) is fixed at the top of the column (91). A second magnetic block (93) is embedded on the end face of the translation block (98) away from the conical column (97). The first magnetic block (92) and the opposite face of the second magnetic block (93) are in a state of magnetic repulsion.

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