Cylindrical solid-state battery

Abstract

The utility model relates to the technical field of solid-state batteries, and discloses a cylindrical solid-state battery, which comprises a cylindrical outer shell and a solid-state battery cell, a plurality of elastic sheets are arranged on the inner wall of the cylindrical outer shell, the plurality of elastic sheets are circumferentially and uniformly distributed on the inner wall of the cylindrical outer shell, one end of each elastic sheet is provided with an insulating inner shell, and the other end of each elastic sheet is provided with an insulating outer shell. According to the solid-state battery, the cylindrical shell serves as a first layer of protection of the solid-state battery, when the cylindrical shell is impacted by external force, the impact force is buffered through the heat-conducting gel and the arc-shaped blocking piece arranged in the cylindrical shell, and therefore the solid-state battery is prevented from being damaged, and the service life of the solid-state battery is prolonged. The impact force is uniformly distributed on the cylindrical outer shell through the obliquely arranged elastic sheets, and the impact force is matched with the protection of the insulating inner shell, so that the influence of external impact on the internal solid-state battery cell is reduced, and the protection capability of the whole solid-state battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of solid-state battery technology, specifically a cylindrical solid-state battery. Background Technology

[0002] Cylindrical solid-state batteries are batteries that are encapsulated in a cylindrical casing and use a solid electrolyte instead of a traditional liquid electrolyte.

[0003] A Chinese patent (CN208655822U) discloses a cylindrical solid-state battery, comprising a wound solid-state battery structure, a cylindrical body, a cylindrical shell, and a sealing cap. The solid electrolyte in the solid-state battery structure is configured with a concave-convex structure, and an insulating liquid is filled between the cylindrical body and the cylindrical shell. This invention's solid-state battery, on the one hand, enhances the adhesion between the solid electrolyte and the positive and negative electrode layers by configuring the solid electrolyte with a concave-convex structure, reducing the possibility of detachment between the electrode layers. On the other hand, by uniformly applying pressure to the solid-state battery structure with a pressurized fluid disposed between the cylindrical body and the cylindrical shell, the pressure is uniformly transmitted to the contact interface between the solid electrolyte and the positive and negative electrode active materials, thereby reducing the interface resistance and improving the output power and performance of the solid-state battery.

[0004] While existing cylindrical solid-state batteries rely on a casing as an external protective structure, the commonly used single stainless steel or aluminum alloy casing design is inadequate in dealing with external impacts. It is difficult to effectively buffer external forces and can easily transfer impact energy directly to the delicate solid-state cells inside, thus threatening the overall safety of the battery. Utility Model Content

[0005] The purpose of this invention is to provide a cylindrical solid-state battery to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cylindrical solid-state battery, comprising: a cylindrical outer shell and a solid-state battery cell, wherein an elastic sheet is provided on the inner wall of the cylindrical outer shell, and there are multiple elastic sheets arranged circumferentially and evenly on the inner wall of the cylindrical outer shell, an insulating inner shell is provided at one end of the elastic sheet, the solid-state battery cell is provided inside the insulating inner shell, an arc-shaped baffle is provided between the middle parts of the elastic sheets, and a thermally conductive gel is provided between the arc-shaped baffle and the inner wall of the cylindrical outer shell.

[0007] Furthermore, thermally conductive gel is also provided between the arc-shaped baffle and the outer wall of the insulating inner shell.

[0008] Furthermore, the solid-state battery cell has insulating pads at both ends, a positive metal cap at the top, and a negative metal sheet at the bottom.

[0009] Furthermore, the elastic sheet is inclined, and one side of the elastic sheet abuts against the insulating inner shell.

[0010] Furthermore, the arc-shaped baffle is made of polytetrafluoroethylene.

[0011] Furthermore, the inner wall of the insulating inner shell is provided with an insulating diaphragm.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention, through the design of a cylindrical outer shell, an insulating inner shell, and an elastic sheet, achieves the following when using a cylindrical solid-state battery: the cylindrical outer shell acts as the first layer of protection for the solid-state battery; when the cylindrical outer shell is subjected to external impact, the thermally conductive gel and arc-shaped baffle inside the cylindrical outer shell buffer the impact force; and the inclined elastic sheet distributes the impact force evenly on the cylindrical outer shell. Combined with the protection of the insulating inner shell, this reduces the impact of external impacts on the internal solid-state battery cells, thereby improving the overall protection capability of the solid-state battery.

[0014] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0015] Figure 1 This is a perspective view of a cylindrical solid-state battery according to the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of a cylindrical solid-state battery according to the present invention;

[0017] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0018] Figure 4 This is a front cross-sectional view of a cylindrical solid-state battery according to the present invention.

[0019] In the diagram: 1. Cylindrical outer shell; 2. Positive electrode metal cap; 3. Solid-state battery cell; 4. Elastic sheet; 5. Thermal conductive gel; 6. Arc-shaped baffle; 7. Insulating inner shell; 8. Negative electrode metal sheet; 9. Insulating gasket. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figures 1-4This utility model provides a technical solution: a cylindrical solid-state battery, comprising: a cylindrical shell 1 and a solid-state battery cell 3. The cylindrical shell 1 is made of stainless steel or aluminum alloy and provides mechanical protection through a high-strength metal structure, serving as the first line of defense for the battery. Its cylindrical design can evenly distribute external pressure, avoiding structural failure caused by stress concentration. At the same time, the metal shell provides electromagnetic shielding, reducing the impact of external electromagnetic interference on the battery cell 3.

[0022] The inner wall of the cylindrical outer shell 1 is provided with elastic sheets 4. Multiple elastic sheets 4 are evenly distributed circumferentially on the inner wall of the cylindrical outer shell 1. When the cylindrical outer shell 1 is subjected to external impact, the multiple evenly distributed elastic sheets 4 can evenly disperse the impact force. Because the elastic sheets 4 are elastic, they can deform to a certain extent, acting like shock absorbers. Before the impact force is transmitted to the internal solid-state battery cell 3, they absorb and buffer some of the energy, thereby reducing the impact force on the cell and improving the reliability and stability of the battery. An insulating inner shell 7 is provided at one end of each elastic sheet 4. The solid-state battery cell 3 is located inside the insulating inner shell 7. An arc-shaped baffle 6 is provided between the middle parts of the elastic sheets 4. The insulating inner shell 7 isolates the solid-state battery cell 3 from the outside environment, providing insulation and protection to prevent accidental conduction between the cell and other components, avoiding safety problems such as short circuits. At the same time, in conjunction with the elastic sheet 4, when subjected to external impact, the insulating inner shell 7 can move appropriately with the deformation of the elastic sheet 4, further dispersing the impact force and providing a double protection barrier for the solid-state battery cell 3, effectively reducing the direct effect of external impact on the cell and ensuring the normal operation of the cell.

[0023] A thermally conductive gel 5 is disposed between the arc-shaped baffle 6 and the inner wall of the cylindrical outer shell 1. The arc-shaped baffle 6 has a certain curvature, and when subjected to external impact, its arc-shaped structure can better disperse the impact force, transferring the impact force along the arc-shaped surface to the surroundings, avoiding excessive local stress. The thermally conductive gel 5 has good thermal conductivity and fills the space between the arc-shaped baffle 6 and the inner wall of the cylindrical outer shell 1. It can quickly transfer the heat generated by the battery during operation to the cylindrical outer shell 1, and dissipate it to the outside through the cylindrical outer shell 1, playing a heat dissipation role and preventing the battery from overheating and causing performance degradation or safety hazards. In addition, the thermally conductive gel 5 has a certain degree of elasticity and cushioning performance. When the arc-shaped baffle 6 is impacted, it can also absorb some energy, enhancing the cushioning effect of the entire structure.

[0024] A thermally conductive gel 5 is also provided between the arc-shaped baffle 6 and the outer wall of the insulating inner shell 7. This thermally conductive gel 5 also serves a heat dissipation function, rapidly transferring the heat generated by the solid-state battery cell 3 to the arc-shaped baffle 6, and then through the thermally conductive gel 5 between the arc-shaped baffle 6 and the inner wall of the cylindrical outer shell 1 to the cylindrical outer shell 1 for heat dissipation, forming a more efficient heat dissipation path. This ensures the battery cell operates within a suitable temperature range, improving battery performance and lifespan. Simultaneously, this layer of thermally conductive gel 5 also acts as a buffer when the insulating inner shell 7 is impacted, reducing rigid collisions between the insulating inner shell 7 and the arc-shaped baffle 6, thus protecting the internal battery cell.

[0025] The solid-state battery cell 3 has insulating pads 9 at both ends, a positive electrode metal cap 2 at the top, and a negative electrode metal sheet 8 at the bottom. The insulating pads 9 further enhance the insulation performance of the cell, preventing conductivity between the cell and other components and ensuring battery safety. The positive electrode metal cap 2 and the negative electrode metal sheet 8 serve as the positive and negative terminals of the battery, providing stable electrode connection points for charging and discharging, enabling reliable connection between the battery and external circuits for energy transfer and storage. Their material and structural design ensure good conductivity and mechanical strength, guaranteeing stable battery operation during charging and discharging.

[0026] The elastic sheet 4 is inclined, with one side abutting against the insulating inner shell 7. This inclined arrangement alters the direction of impact force transmission. When the cylindrical outer shell 1 is impacted, the inclined elastic sheet 4 decomposes the impact force into multiple directional components, allowing for a more even distribution of the impact force across the cylindrical outer shell 1. Compared to a vertically positioned elastic sheet, this design more effectively disperses the impact force and reduces the pressure on individual parts. Simultaneously, the elastic sheet 4 abuts against the insulating inner shell 7; under impact, the deformation of the elastic sheet 4 causes the insulating inner shell 7 to move, further buffering and dispersing the impact force, and better protecting the internal solid-state battery cell 3.

[0027] The arc-shaped baffle 6 is made of polytetrafluoroethylene (PTFE). PTFE has excellent chemical stability and corrosion resistance, maintaining its performance stability in various complex environments and is not prone to chemical reactions with other substances. This ensures that the arc-shaped baffle 6 will not be damaged by chemical corrosion during long-term use inside the battery. Furthermore, PTFE has a low coefficient of friction, which reduces friction between the arc-shaped baffle 6 and other components when it moves or deforms under external impact. This allows for smoother buffering and dispersion of impact forces, while reducing heat and wear caused by friction, thus extending battery life.

[0028] An insulating diaphragm is provided on the inner wall of the insulating inner shell 7. The insulating diaphragm further strengthens the insulation protection of the solid-state battery cell 3 by the insulating inner shell 7, preventing the cell from conducting electricity with the inner wall of the insulating inner shell 7 and avoiding dangerous situations such as short circuits. At the same time, the insulating diaphragm can also play a buffering role to a certain extent, protecting the surface of the cell from wear and tear, and helping to maintain the structural stability of the cell, ensuring that the cell can perform normally during operation.

[0029] When using a cylindrical solid-state battery, the cylindrical outer shell 1 serves as the first layer of protection for the solid-state battery. When the cylindrical outer shell 1 is subjected to an external impact, the impact force is buffered by the thermally conductive gel 5 and the arc-shaped baffle 6 installed inside the cylindrical outer shell 1. The impact force is evenly distributed on the cylindrical outer shell 1 by the inclined elastic sheet 4. With the protection of the insulating inner shell 7, the impact of external impact on the internal solid-state battery cell 3 is reduced, thereby improving the overall protection capability of the solid-state battery.

[0030] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A cylindrical solid-state battery, comprising: A cylindrical shell (1) and a solid-state battery cell (3) are characterized in that: the inner wall of the cylindrical shell (1) is provided with an elastic sheet (4), there are multiple elastic sheets (4), the multiple elastic sheets (4) are evenly arranged in a circumferential direction on the inner wall of the cylindrical shell (1), one end of the elastic sheet (4) is provided with an insulating inner shell (7), the solid-state battery cell (3) is provided inside the insulating inner shell (7), an arc-shaped baffle (6) is provided between the middle parts of the elastic sheets (4), and a thermally conductive gel (5) is provided between the arc-shaped baffle (6) and the inner wall of the cylindrical shell (1).

2. The cylindrical solid-state battery according to claim 1, characterized in that: Thermally conductive gel (5) is also provided between the arc-shaped baffle (6) and the outer wall of the insulating inner shell (7).

3. A cylindrical solid-state battery according to claim 1, characterized in that: The solid-state battery cell (3) has insulating pads (9) at both ends, a positive metal cap (2) at the top and a negative metal sheet (8) at the bottom.

4. A cylindrical solid-state battery according to claim 1, characterized in that: The elastic sheet (4) is inclined, and one side of the elastic sheet (4) abuts against the insulating inner shell (7).

5. A cylindrical solid-state battery according to claim 1, characterized in that: The arc-shaped baffle (6) is made of polytetrafluoroethylene.

6. A cylindrical solid-state battery according to claim 1, characterized in that: The inner wall of the insulating inner shell (7) is provided with an insulating diaphragm.

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