High-efficiency sodium-ion battery cylindrical cell module

Abstract

The utility model discloses a kind of efficient sodium ion battery cylindrical battery module, including aluminum shell, the inside fixed mounting of aluminum shell has roll core, the top end of aluminum shell is engaged and is installed with top shell, the bottom end fixed mounting of top shell has thermistor, the bottom end fixed mounting of thermistor has current interrupter, the bottom end fixed mounting of current interrupter has explosion-proof valve, the bottom end of explosion-proof valve is fixedly connected with the bottom end of roll core, the side fixed mounting of roll core top end has tab, the one end of roll core column one side is fixedly connected with the one end of positive thin film, a kind of efficient sodium ion battery cylindrical battery module of the utility model, by setting high-energy component, metal sodium in sodium sheet body loses electron to generate sodium ion under low potential, dissolve into electrolyte, and with electrolyte due to sodium ion concentration difference and enter the interstice of pole piece and negative thin film, improve the electron energy density in sodium ion battery, satisfy people to the use demand of sodium ion efficient power supply.

Description

Technical Field

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

[0002] Against the backdrop of a global push for energy transition, the new energy industry has ushered in unprecedented development opportunities. Sodium-ion batteries, as a rising star in the new energy field, are gradually emerging and attracting much attention. The working principle of sodium-ion batteries is similar to that of lithium-ion batteries, mainly through the insertion and extraction of sodium ions between the positive and negative electrodes to achieve charge transfer. However, compared with lithium-ion batteries, sodium-ion batteries have many unique advantages. From a resource perspective, sodium is abundant and widely distributed on Earth, with an abundance of about 2.3% in the Earth's crust, nearly a thousand times that of lithium. This allows sodium-ion batteries to break free from the heavy dependence on scarce lithium resources, providing a solid resource foundation for large-scale applications. In terms of cost, its raw material prices are low. Although the cost advantage is not fully reflected at present due to factors such as the early stage of industrialization, in the long run, with technological progress and economies of scale, low-cost production is expected to be achieved.

[0003] However, traditional sodium-ion batteries have the following drawbacks: Compared to lithium-ion batteries, sodium ions in traditional sodium-ion batteries have a larger radius and slower diffusion dynamics, which cannot meet people's needs for efficient power supply using sodium ions. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency sodium-ion battery cylindrical cell module to solve the problem mentioned in the background art that traditional sodium-ion batteries have a larger sodium ion radius and slower diffusion dynamics compared to lithium-ion batteries, which cannot meet people's demand for high-efficiency sodium-ion power supply.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency sodium-ion battery cylindrical cell module, comprising an aluminum shell, a wound core fixedly installed inside the aluminum shell, a top shell snapped onto the top of the aluminum shell, a thermistor fixedly installed at the bottom of the top shell, a current blocker fixedly installed at the bottom of the thermistor, an explosion-proof valve fixedly installed at the bottom of the current blocker, the bottom of the explosion-proof valve being fixedly connected to the bottom of the wound core, an electrode tab fixedly installed on one side of the top of the wound core, the wound core comprising a wound core column and a positive electrode film, one end of one side of the wound core column being connected to one end of the positive electrode film. A fixed connection is provided, with a negative electrode film fixedly installed at one end of one side of the core column. Several high-energy components are fixedly installed on the surface of the negative electrode film. The current blocker prevents safety hazards caused by thermal runaway by cutting off the circuit when the battery overheats, short-circuits, or side reactions occur inside. The explosion-proof valve automatically opens to release pressure when the internal pressure is too high, preventing the battery from exploding or thermal runaway. The thermistor mainly plays the role of overheat protection and overcurrent protection in the battery. When the internal temperature of the battery rises or the current is too large, the resistance of the thermistor will increase sharply, thereby limiting the current or cutting off the circuit to prevent battery damage.

[0006] Preferably, each of the high-energy components includes a sodium-aluminum substrate and a sodium sheet body. One side of the sodium-aluminum substrate is fixedly connected to one side of the sodium sheet body. The surface of the sodium sheet body is provided with a plurality of grooves, and the grooves increase the sodium replenishment area of ​​the sodium sheet body itself.

[0007] Preferably, the sides of several sodium-aluminum substrates away from the sodium sheet body are fixedly connected to the negative electrode film. The sodium-aluminum substrates and the negative electrode film are welded to form electronic conductivity. The metallic sodium in the sodium sheet body loses electrons at a low potential to generate sodium ions, which dissolve into the electrolyte and enter the pores of the electrode and the negative electrode film due to the concentration difference of sodium ions in the electrolyte. The sodium ions spontaneously and uniformly react on the surface of the negative electrode film to gain electrons.

[0008] Preferably, a separator film is fixedly installed on the core column between the positive electrode film and the negative electrode film. The positive electrode film can effectively prevent transition metal ions from dissolving into the electrolyte by forming a chemically stable coating layer, such as an alumina layer, on the surface of the positive electrode particles. The negative electrode film is usually attached to the surface of the current collector, such as nickel foam, and is prepared by a thermomechanical coupling process to form a self-standing porous carbon structure. It can serve as a sodium ion storage reservoir and buffer the volume changes during charging and discharging, thereby enhancing the mechanical stability of the electrode. The separator film separates the positive and negative electrode materials of the battery to prevent direct contact from causing a short circuit. At the same time, it prevents the direct transfer of electrons through its insulating properties, ensuring the safe operation of the battery.

[0009] Preferably, the surface of the core column is fixedly connected to the aluminum shell, and the core is mounted on the aluminum shell through the core column.

[0010] Preferably, a bottom insulating ring is fitted at the bottom of the connection between the aluminum shell and the core, and a top insulating ring is fitted at the top of the connection between the aluminum shell and the core. The insulating rings provide insulation protection from both ends of the core, thereby improving the insulation of the battery cell module itself.

[0011] Preferably, a sealing ring is fitted at the connection between the explosion-proof valve and the core. The installation of the sealing ring fills the gap between the explosion-proof valve and the core, thereby improving the sealing performance of the battery module itself.

[0012] Compared with the prior art, the beneficial effects of this utility model are: by setting a high-energy component, the metallic sodium in the sodium sheet body loses electrons at a low potential to generate sodium ions, which dissolve into the electrolyte and enter the pores of the electrode sheet and the negative electrode film along with the electrolyte due to the concentration difference of sodium ions, thereby increasing the electron energy density in the sodium-ion battery and meeting people's demand for efficient sodium-ion power supply. Attached Figure Description

[0013] Figure 1 This is an exploded view of the present invention; Figure 2 This is a perspective view of the present utility model; Figure 3 This is a schematic diagram of the structure of the core of this utility model; Figure 4 This is a side view of the high-energy component of this utility model.

[0014] In the diagram: 1. Top shell; 2. Thermistor; 3. Current interruptor; 4. Explosion-proof valve; 5. Sealing ring; 6. Top insulating ring; 7. Aluminum shell; 8. Bottom insulating ring; 9. Core; 91. Core post; 92. Positive electrode film; 93. Separator film; 94. Negative electrode film; 95. High-energy component; 951. Sodium-aluminum substrate; 952. Sodium sheet body; 953. Groove; 10. Tab. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] Please see Figure 1-4This utility model provides a high-efficiency sodium-ion battery cylindrical cell module, including an aluminum shell 7, a core 9 fixedly installed inside the aluminum shell 7, a top shell 1 snapped onto the top of the aluminum shell 7, a thermistor 2 fixedly installed at the bottom of the top shell 1, a current blocker 3 fixedly installed at the bottom of the thermistor 2, an explosion-proof valve 4 fixedly installed at the bottom of the current blocker 3, and the bottom of the explosion-proof valve 4 fixedly connected to the bottom of the core 9. An electrode tab 10 is fixedly installed on one side of the top of the core 9. The core 9 includes a core post 91 and a positive electrode film 92, with one end of one side of the core post 91 fixedly connected to one end of the positive electrode film 92. A negative electrode film 94 is fixedly installed at the other end of one side of the column 91. Several high-energy components 95 are fixedly installed on the surface of the negative electrode film 94. The current blocker 3 prevents the safety hazards caused by thermal runaway by cutting off the circuit when the battery overheats, short-circuits, or side reactions occur inside. The explosion-proof valve 4 automatically opens to release pressure when the internal pressure is too high, preventing the battery from exploding or thermal runaway. The thermistor 2 mainly plays the role of overheat protection and overcurrent protection in the battery. When the internal temperature of the battery rises or the current is too large, the resistance of the thermistor 2 will increase sharply, thereby limiting the current or cutting off the circuit to prevent the battery from being damaged.

[0017] Several high-energy components 95 include a sodium-aluminum substrate 951 and a sodium sheet body 952. One side of the sodium-aluminum substrate 951 is fixedly connected to one side of the sodium sheet body 952. Several grooves 953 are formed on the surface of the sodium sheet body 952. The grooves 953 increase the sodium replenishment area of ​​the sodium sheet body 952 itself.

[0018] Several sodium-aluminum substrates 951 are fixedly connected to the negative electrode film 94 on the side away from the sodium sheet body 952. The sodium-aluminum substrates 951 and the negative electrode film 94 are welded to form electronic conduction. The metallic sodium in the sodium sheet body 952 loses electrons at a low potential to generate sodium ions, which dissolve into the electrolyte and enter the pores of the electrode and the negative electrode film 94 along with the electrolyte due to the concentration difference of sodium ions. The sodium ions spontaneously and uniformly react on the surface of the negative electrode film 94 and gain electrons.

[0019] A separator film 93 is fixedly installed on the core post 91 between the positive electrode film 92 and the negative electrode film 94. The positive electrode film 92 effectively prevents transition metal ions from dissolving into the electrolyte by forming a chemically stable coating layer, such as an alumina layer, on the surface of the positive electrode particles. The negative electrode film 94 is usually attached to the surface of the current collector, such as nickel foam, and is prepared by a thermomechanical coupling process to form a self-standing porous carbon structure. It can serve as a sodium ion storage reservoir and buffer the volume changes during charging and discharging, thereby enhancing the mechanical stability of the electrode. The separator film 93 separates the positive and negative electrode materials of the battery to prevent direct contact from causing a short circuit. At the same time, it prevents the direct transfer of electrons through its insulating properties, ensuring the safe operation of the battery.

[0020] The surface of the core column 91 is fixedly connected to the aluminum shell 7, and the core 9 is mounted on the aluminum shell 7 through the core column 91.

[0021] A bottom insulating ring 8 is fitted at the bottom of the connection between the aluminum shell 7 and the core 9, and a top insulating ring 6 is fitted at the top of the connection between the aluminum shell 7 and the core 9. The insulating rings provide insulation protection from both ends of the core 9, thereby improving the insulation of the battery cell module itself.

[0022] A sealing ring 5 is fitted at the connection between the explosion-proof valve 4 and the core 9. The installation of the sealing ring 5 fills the gap between the explosion-proof valve 4 and the core 9, thereby improving the sealing performance of the battery module itself.

[0023] In this embodiment, the positive electrode film 92, by forming a chemically stable coating layer such as an alumina layer on the surface of the positive electrode particles, can effectively prevent transition metal ions from dissolving into the electrolyte; the negative electrode film 94 is typically attached to the surface of a current collector such as nickel foam, and is prepared through a thermomechanical coupling process to form a self-standing porous carbon structure, which can serve as a sodium ion storage reservoir and buffer volume changes during charging and discharging, enhancing the mechanical stability of the electrode; the separator film 93 separates the positive and negative electrode materials of the battery to prevent direct contact from causing a short circuit, and at the same time, prevents direct electron transfer through its insulating properties to ensure the safe operation of the battery; the sodium-aluminum substrate 951 and the negative electrode film 94 are welded to form electronic conductivity, and the gold in the sodium substrate 952... Sodium loses electrons at low potential to form sodium ions, which dissolve in the electrolyte and enter the pores of the electrode and negative electrode film 94 due to the concentration difference of sodium ions in the electrolyte. Sodium ions spontaneously and uniformly react on the surface of the negative electrode film 94, gaining electrons. The current blocker 3 prevents thermal runaway safety hazards by cutting off the circuit when the battery overheats, short-circuits, or side reactions occur. The explosion-proof valve 4 automatically opens to release pressure when the internal pressure is too high, preventing the battery from exploding or thermal runaway. The thermistor 2 mainly plays the role of overheat protection and overcurrent protection in the battery. When the internal temperature of the battery rises or the current is too high, the resistance of the thermistor 2 will increase sharply, thereby limiting the current or cutting off the circuit to prevent battery damage.

[0024] Although the present invention 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 the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency sodium-ion battery cylindrical cell module, comprising an aluminum shell (7), characterized in that: The aluminum shell (7) has a core (9) fixedly installed inside. The top of the aluminum shell (7) is fitted with a top shell (1). The bottom of the top shell (1) is fixedly installed with a thermistor (2). The bottom of the thermistor (2) is fixedly installed with a current blocker (3). The bottom of the current blocker (3) is fixedly installed with an explosion-proof valve (4). The bottom of the explosion-proof valve (4) is fixedly connected to the bottom of the core (9). A tab (10) is fixedly installed on one side of the top of the core (9). The core (9) includes a core post (91) and a positive electrode film (92). One end of one side of the core post (91) is fixedly connected to one end of the positive electrode film (92). The other end of one side of the core post (91) is fixedly installed with a negative electrode film (94). Several high-energy components (95) are fixedly installed on the surface of the negative electrode film (94).

2. The high-efficiency sodium-ion battery cylindrical cell module according to claim 1, characterized in that: Each of the high-energy components (95) includes a sodium-aluminum substrate (951) and a sodium sheet body (952). One side of the sodium-aluminum substrate (951) is fixedly connected to one side of the sodium sheet body (952). The surface of the sodium sheet body (952) is provided with a number of grooves (953).

3. The high-efficiency sodium-ion battery cylindrical cell module according to claim 2, characterized in that: The side of each of the sodium-aluminum substrates (951) away from the sodium substrate body (952) is fixedly connected to the negative electrode film (94).

4. The high-efficiency sodium-ion battery cylindrical cell module according to claim 1, characterized in that: A separator film (93) located between the positive electrode film (92) and the negative electrode film (94) is fixedly installed on the core column (91).

5. A high-efficiency sodium-ion battery cylindrical cell module according to claim 1, characterized in that: The surface of the core column (91) is fixedly connected to the aluminum shell (7).

6. The high-efficiency sodium-ion battery cylindrical cell module according to claim 1, characterized in that: A bottom insulating ring (8) is fitted at the bottom of the connection between the aluminum shell (7) and the core (9), and a top insulating ring (6) is fitted at the top of the connection between the aluminum shell (7) and the core (9).

7. A high-efficiency sodium-ion battery cylindrical cell module according to claim 1, characterized in that: A sealing ring (5) is fitted at the connection between the explosion-proof valve (4) and the core (9).

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