Low-temperature sodium ion battery

Abstract

The utility model discloses a low-temperature sodium ion battery which comprises a battery box, a box cover and a battery inner core, the battery inner core is arranged on the inner side of the battery box, the box cover is fixed at the top of the battery box, and the battery box is of a hollow rectangular structure formed by an outer layer shell and an inner layer shell; the battery box is of the hollow rectangular structure formed by the outer-layer shell and the inner-layer shell, the protection performance of the battery box is higher through the double-layer shell structure, the flame-retardant block is filled between the outer-layer shell and the inner-layer shell, the flame-retardant block is composed of the deflection steel sheet and the flame-retardant rubber wrapping the outer side of the deflection steel sheet, and the flame-retardant rubber is arranged between the deflection steel sheet and the inner-layer shell. A flame-retardant effect can be formed through the flame-retardant rubber, so that when the battery is on fire, the fire behavior is reduced, and when a sharp object punctures into the battery, the tip part of the sharp object can be deflected towards two sides through the deflection steel sheet, so that an inner core of the battery is prevented from being damaged, and meanwhile, the flame-retardant rubber can also prevent the object from puncturing.

Description

Technical Field

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

[0002] Sodium-ion batteries, as an ideal candidate for next-generation large-scale energy storage technology, have attracted widespread attention from the industry due to their cost advantages. Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) Sodium salt raw materials are abundant and inexpensive. Compared with the ternary cathode materials of lithium-ion batteries, the raw material cost is reduced by half when using iron-manganese-nickel-based cathode materials; (2) Due to the characteristics of sodium salts, low-concentration electrolytes can be used (for the same concentration of electrolyte, the conductivity of sodium salts is about 20% higher than that of lithium electrolytes), thus reducing costs; (3) Sodium ions do not form alloys with aluminum, and aluminum foil can be used as the current collector for the negative electrode, which can further reduce costs by about 8% and weight by about 10%; (4) Since sodium-ion batteries have no over-discharge characteristics, they can be discharged to zero volts. The energy density of sodium-ion batteries is greater than 100Wh / kg, which is comparable to that of lithium iron phosphate batteries, but its cost advantage is obvious, and it is expected to replace traditional lead-acid batteries in large-scale energy storage. While sodium-ion batteries offer many advantages, most contain a liquid electrolyte, making them prone to leakage when punctured by a foreign object, and posing a flammability risk. Therefore, improvements to sodium-ion batteries are necessary. Utility Model Content

[0003] The purpose of this invention is to provide a low-temperature sodium-ion battery to solve the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature sodium-ion battery, comprising a battery box, a box cover, and a battery core. The battery core is installed inside the battery box, and the box cover is fixed to the top of the battery box. The battery box is a hollow rectangular structure formed by an outer shell and an inner shell. A cavity is provided between the outer shell and the inner shell, surrounding the inner shell. The cavity is divided into several flame-retardant block filling slots by a partition. Flame-retardant blocks are filled in the flame-retardant block filling slots. The flame-retardant blocks are composed of deflecting steel sheets and flame-retardant rubber wrapped around the outside of the deflecting steel sheets. The deflecting steel sheets have a V-shaped structure, and the pointed ends of the deflecting steel sheets face outward.

[0005] Preferably, the inner shell has multiple battery core filling positions on its inner side. Each battery core filling position is composed of four rectangularly arranged limiting plates. The battery core is filled in the battery core filling position, and the limiting plates and the battery box are integrally injection molded.

[0006] Preferably, a barrier plate is provided between two adjacent battery core filling positions, and the barrier plate and the battery box are integrally injection molded.

[0007] Preferably, the cover is provided with multiple upper heat dissipation holes, and the bottom of the battery box is provided with multiple lower heat dissipation holes.

[0008] Preferably, a connecting groove is provided at each of the four corners of the battery box, and a connecting post is fixed at each of the four corners of the bottom of the box cover, with the connecting post and the connecting groove being clearance fit.

[0009] Preferably, the partition is integrally injection molded with the outer shell and the inner shell.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The battery box of this utility model is a hollow rectangular structure formed by an outer shell and an inner shell. The double shell structure makes the battery box more protective. A flame-retardant block is filled between the outer shell and the inner shell. The flame-retardant block is composed of a deflecting steel sheet and flame-retardant rubber wrapped around the outside of the deflecting steel sheet. The flame-retardant rubber can form a flame-retardant effect, which reduces the fire when the battery catches fire. The deflecting steel sheet has a V-shaped structure and the tip of the deflecting steel sheet faces outward. When a sharp object pierces into the battery, the deflecting steel sheet can deflect the tip of the sharp object to both sides, thereby avoiding damage to the battery core. At the same time, the flame-retardant rubber can also prevent the object from piercing. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic diagram of the overall internal structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the battery box structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the box lid of this utility model;

[0015] Figure 4 This is a schematic diagram of the overall external structure of this utility model.

[0016] In the diagram: 1. Battery box; 2. Box cover; 3. Outer shell; 4. Battery core; 5. Inner shell; 6. Separator; 7. Flame retardant block filling groove; 8. Flame retardant block; 9. Flame retardant rubber; 10. Deflecting steel sheet; 11. Lower heat dissipation hole; 12. Limiting plate; 13. Barrier plate; 14. Connecting post; 15. Upper heat dissipation hole; 16. Connecting groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] Please see Figure 1-4 In this embodiment of the present invention, a low-temperature sodium-ion battery includes a battery box 1, a box cover 2, and a battery core 4. The battery core 4 is installed inside the battery box 1, and the box cover 2 is fixed to the top of the battery box 1. The battery box 1 is a hollow rectangular structure formed by an outer shell 3 and an inner shell 5. A cavity is provided between the outer shell 3 and the inner shell 5, surrounding the inner shell 5. The cavity is divided into several flame-retardant block filling grooves 7 by a partition 6. Flame-retardant blocks 8 are filled in the flame-retardant block filling grooves 7. The flame-retardant blocks 8 are composed of a deflecting steel sheet 10 and flame-retardant rubber 9 wrapped around the outside of the deflecting steel sheet 10. The deflecting steel sheet 10 has a V-shaped structure, and the tip of the deflecting steel sheet 10 faces outward. The double-layer shell structure enhances the protection of the battery box 1. A flame-retardant block 8 is filled between the outer shell 3 and the inner shell 5. The flame-retardant block 8 consists of a deflecting steel sheet 10 and flame-retardant rubber 9 wrapped around the outside of the deflecting steel sheet 10. The partition 6 is integrally injection molded with the outer shell 3 and the inner shell 5. The flame-retardant rubber 9 can create a flame-retardant effect, reducing the intensity of the fire when the battery catches fire. The deflecting steel sheet 10 has a V-shaped structure with its tip facing outward. When a sharp object pierces into the battery, the deflecting steel sheet 10 can deflect the tip of the sharp object to both sides, thereby preventing damage to the battery core 4. At the same time, the flame-retardant rubber 9 can also prevent the object from piercing.

[0019] The inner shell 5 has multiple battery core filling positions on its inner side. Each battery core filling position is composed of four rectangular limiting plates 12. The battery core 4 is filled in the battery core filling position. The limiting plates 12 and the battery box 1 are integrally injection molded.

[0020] A barrier plate 13 is provided between two adjacent battery core filling positions. The barrier plate 13 is integrally injection molded with the battery box 1. The barrier plate 13 is used to prevent two adjacent battery cores 4 from colliding together.

[0021] The cover 2 has multiple upper heat dissipation holes 15, and the bottom of the battery box 1 has multiple lower heat dissipation holes 11. Both the upper heat dissipation holes 15 and the lower heat dissipation holes 11 are used for heat dissipation.

[0022] The battery box 1 has a connecting groove 16 at each of its four corners, and the box cover 2 has a connecting post 14 at each of its four corners at the bottom. The connecting post 14 and the connecting groove 16 are in clearance fit. The box cover 2 can be initially fixed by the connecting post 14 and the connecting groove 16.

[0023] The working principle of this utility model is as follows: The battery box 1 of this utility model is a hollow rectangular structure formed by an outer shell 3 and an inner shell 5. The double shell structure makes the battery box 1 more protective. A flame-retardant block 8 is filled between the outer shell 3 and the inner shell 5. The flame-retardant block 8 is composed of a deflecting steel sheet 10 and flame-retardant rubber 9 wrapped around the outside of the deflecting steel sheet 10. The flame-retardant rubber 9 can form a flame-retardant effect, so that when the battery catches fire, the fire is reduced. The deflecting steel sheet 10 has a V-shaped structure and the tip of the deflecting steel sheet 10 faces outward. When a sharp object pierces into the battery, the deflecting steel sheet 10 can deflect the tip of the sharp object to both sides, thereby avoiding damage to the battery core 4. At the same time, the flame-retardant rubber 9 can also prevent the object from piercing.

[0024] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-temperature sodium-ion battery, comprising a battery case (1), a case cover (2), and a battery core (4), wherein the battery core (4) is installed inside the battery case (1), and the case cover (2) is fixed to the top of the battery case (1), characterized in that: The battery box (1) is a hollow rectangular structure formed by an outer shell (3) and an inner shell (5). A cavity is provided between the outer shell (3) and the inner shell (5) around the inner shell (5). The cavity is divided into several flame-retardant block filling slots (7) by a partition (6). Flame-retardant blocks (8) are filled in the flame-retardant block filling slots (7). The flame-retardant blocks (8) are composed of a deflecting steel sheet (10) and flame-retardant rubber (9) wrapped around the outside of the deflecting steel sheet (10). The deflecting steel sheet (10) has a V-shaped structure and the tip of the deflecting steel sheet (10) faces outward.

2. The low-temperature sodium-ion battery according to claim 1, characterized in that: The inner shell (5) has multiple battery core filling positions on its inner side. Each battery core filling position is composed of four rectangular limiting plates (12). The battery core (4) is filled in the battery core filling position. The limiting plates (12) and the battery box (1) are integrally injection molded.

3. A low-temperature sodium-ion battery according to claim 2, characterized in that: A barrier plate (13) is provided between two adjacent battery core filling positions. The barrier plate (13) and the battery box (1) are integrally injection molded.

4. A low-temperature sodium-ion battery according to claim 1, characterized in that: The cover (2) is provided with multiple upper heat dissipation holes (15), and the bottom of the battery box (1) is provided with multiple lower heat dissipation holes (11).

5. A low-temperature sodium-ion battery according to claim 1, characterized in that: The battery box (1) has a connecting groove (16) at each of its four corners, and the bottom of the cover (2) has a connecting post (14) at each of its four corners. The connecting post (14) and the connecting groove (16) are in clearance fit.

6. A low-temperature sodium-ion battery according to claim 1, characterized in that: The partition (6) is integrally injection molded with the outer shell (3) and the inner shell (5).

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