A titanium capacitor cell

Abstract

The utility model relates to a kind of titanium capacitor batteries, including shell, electric core, positive pole guide needle, negative pole guide needle, electric core is installed in shell interior, positive pole guide needle, negative pole guide needle is same direction and protrudes from the top of electric core, the electric core is wound by positive pole sheet, diaphragm, negative pole sheet, the positive pole sheet is composed of positive pole aluminium foil layer and positive pole coating layer, positive pole coating layer is coated in the surface of positive pole aluminium foil layer, the negative pole sheet of the utility model titanium capacitor battery is composed of negative pole aluminium foil layer and lithium titanate coating layer, lithium titanate coating layer is coated in the surface of negative pole aluminium foil layer, using lithium titanate coating has the characteristics of high safety, high stability, wide temperature range, long life and green environmental protection, titanium capacitor battery can be applicable to energy storage power supply, instrument and apparatus, UPS power supply and other fields, can replace super farad capacitor and lithium battery module in special industrial field.

Description

Technical Field

[0001] This utility model relates to the field of batteries, specifically to a titanium capacitor battery. Background Technology

[0002] In existing technologies, lithium-ion battery cells are made by winding a positive electrode, a separator, and a negative electrode. The positive electrode consists of an aluminum foil layer and a positive electrode coating layer. The positive electrode coating layer can be made of lithium iron phosphate, lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), etc. The negative electrode consists of a copper foil layer and a negative electrode graphite carbon coating layer. The negative electrode coating layer is mainly graphite. The carbon structure is unstable and is prone to collapse and short circuit after collision, which can lead to combustion and fire. The safety needs to be further improved.

[0003] Furthermore, lithium-ion battery cells require welding for the tabs to the electrode plates, the cover plate to the tabs, the tabs to the leads, and the leads to the wires. Conventional thermoforming welding methods such as resistance welding, ultrasonic welding, and laser welding rely on resistance welding. Resistance welding uses electrical current to generate heat, melting the workpiece to form a weld nugget, which then cools and crystallizes to form a weld point. In other words, the contact resistance and internal resistance of the workpiece are essential for generating heat during resistance welding. Welding of conductive connection structures can create different zones, affecting conductivity and hindering high-rate discharge. The cell sealing of lithium-ion batteries is achieved through a top cover, typically composed of a top cover plate, gasket, vent, safety valve, and sealing ring. The vent is located within the safety valve. The top cover plate, gasket, safety valve, and sealing ring are installed sequentially from top to bottom inside the outer casing. The disadvantages of this top cover sealing structure are its numerous and complex components, high manufacturing difficulty, low assembly efficiency, and high cost. Utility Model Content

[0004] To address the aforementioned deficiencies in existing technologies, the technical problem this invention aims to solve is how to optimize the cell structure, conductive connection structure, and sealing structure. The specific technical solution is as follows:

[0005] A titanium capacitor battery includes a casing, a cell, a positive electrode pin, and a negative electrode pin. The cell is installed inside the casing. The positive electrode pin and the negative electrode pin extend from the top of the cell in the same direction. The cell is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet is composed of a positive electrode aluminum foil layer and a positive electrode coating layer, with the positive electrode coating layer coated on the surface of the positive electrode aluminum foil layer. The negative electrode sheet is composed of a negative electrode aluminum foil layer and a lithium titanate coating layer, with the lithium titanate coating layer coated on the surface of the negative electrode aluminum foil layer.

[0006] As a preferred embodiment of this utility model, the positive electrode coating layer is composed of lithium cobalt oxide and lithium manganese oxide.

[0007] As a preferred embodiment of this utility model, the lower end of the positive electrode guide pin is riveted to the positive electrode tab, and the lower end of the negative electrode guide pin is riveted to the negative electrode tab. Both the positive electrode tab and the negative electrode tab are provided with multiple riveting points. The positive electrode tab is riveted to the positive electrode sheet through the riveting points, and the negative electrode tab is riveted to the negative electrode sheet of the battery cell through the riveting points.

[0008] As a preferred embodiment of this utility model, the cross-sectional shape of the rivet point is plum blossom-shaped or five-pointed star-shaped.

[0009] As a preferred embodiment of this utility model, an insulating rubber plug is fitted inside the upper part of the outer shell, and the positive and negative electrode leads out of the insulating rubber plug in the same direction. A concave waistband is provided on the outer periphery of the outer shell, which presses down on the side of the insulating rubber plug. The upper end of the outer shell is bent inward to form a sealing strip, which presses down on the upper surface of the insulating rubber plug.

[0010] As a preferred embodiment of this utility model, the waist belt has a depth of 2-4mm and the sealing strip has a length of 1-2mm.

[0011] As a preferred embodiment of this utility model, the rated voltage is 2.7V or 3.0V, the high platform voltage is 2.2-2.9V, the energy density is 90Wh / Kg, and the self-discharge rate is <10% per year.

[0012] Beneficial effects: The negative electrode of this titanium capacitor battery consists of a negative electrode aluminum foil layer and a lithium titanate coating layer. The lithium titanate coating layer is coated on the surface of the negative electrode aluminum foil layer. The lithium titanate coating has the characteristics of high safety, high stability, wide temperature range, long life and green environmental protection. The titanium capacitor battery can be used in energy storage power supply, instrumentation, UPS power supply and other fields, and can replace super farad capacitors and lithium battery modules in special industrial fields. Attached Figure Description

[0013] Figure 1 This is a structural cross-sectional view of the present invention;

[0014] Figure 2 This is a layered structure diagram of this utility model;

[0015] Figure 3 This is a structural diagram of the riveting point embodiment of the conductive connection structure of the guide pin of this utility model;

[0016] Figure 4 This is a structural diagram of the second embodiment of the rivet point of the conductive connection structure of the guide pin of this utility model;

[0017] Figure 5 yes Figure 1 A magnified view of point A in the middle. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0019] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] like Figure 1-3 As shown, a titanium capacitor battery includes a casing 1, a battery cell 2, a positive electrode pin 3, and a negative electrode pin 4. The battery cell 2 is installed inside the casing 1. The positive electrode pin 3 and the negative electrode pin 4 extend from the top of the battery cell 2 in the same direction. The battery cell 2 is formed by winding a positive electrode sheet 21, a separator 22, and a negative electrode sheet 23. The positive electrode sheet 21 is composed of a positive electrode aluminum foil layer 21a and a positive electrode coating layer 21b. The positive electrode coating layer 21b is coated on the surface of the positive electrode aluminum foil layer 21a and is composed of lithium cobalt oxide and lithium manganese oxide. The negative electrode sheet 2... 3. It consists of a negative electrode aluminum foil layer 23a and a lithium titanate coating layer 23b. The lithium titanate coating layer 23b is coated on the surface of the negative electrode aluminum foil layer 23a. The lithium titanate coating layer 23b is a zero-strain material, which will not produce lithium dendrite phenomenon, resulting in good cycle performance; stable discharge voltage, and the electrolyte is not easily decomposed, improving battery safety performance; compared with carbon negative electrode materials, lithium titanate has a high lithium-ion diffusion coefficient, which can be charged and discharged at high rates; the potential of lithium titanate is higher than that of pure metallic lithium, providing a foundation for ensuring the safety of lithium batteries.

[0022] like Figure 3 and 4As shown, the conductive connection structure of the guide pins is as follows: the lower end of the positive guide pin 3 is riveted to the positive electrode tab 5, and the lower end of the negative guide pin 4 is riveted to the negative electrode tab 6. Both the positive electrode tab 5 and the negative electrode tab 6 have multiple riveting points 7. The positive electrode tab 3 is riveted to the positive electrode plate 21 through the riveting points 7, and the negative electrode tab 6 is riveted to the negative electrode plate 23 of the battery cell through the riveting points 7. The cross-sectional shape of the riveting points 7 is plum blossom-shaped or pentagonal. The riveting method achieves electrical connection between the positive and negative guide pins and the positive and negative electrode tabs, and between the positive and negative electrode tabs and the positive and negative electrode plates. The riveting method is stable and does not have the problem of affecting conductivity due to welding different sections. Moreover, the riveting is highly automated and efficient.

[0023] like Figure 1 and 5 As shown, an insulating rubber plug 8 is fitted inside the upper part of the outer casing 1. The positive electrode needle 3 and the negative electrode needle 4 extend out of the insulating rubber plug 8 in the same direction. A concave waistband 9 is provided on the outer periphery of the outer casing 1, pressing down on the side of the insulating rubber plug 8. The upper end of the outer casing 1 is bent inward to form a sealing strip 10, which presses down on the upper surface of the insulating rubber plug 8. The depth of the waistband 9 is 2-4 mm, and the length of the sealing strip 10 is 1-2 mm. The waistband 9 and the sealing strip 10 work together to simultaneously restrict the position of the insulating rubber plug 8, ensuring that the insulating rubber plug 8 is fixedly fitted inside the upper part of the outer casing 1 without loosening, resulting in a reasonable sealing structure.

[0024] This utility model of titanium capacitor battery has a rated voltage of 2.7V or 3.0V, a high plateau voltage of 2.2-2.9V, an energy density of 90Wh / Kg, and a self-discharge rate of <10% per year.

[0025] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the protection scope of the present utility model.

Claims

1. A titanium capacitor battery, comprising a casing, a cell, a positive electrode pin, and a negative electrode pin, wherein the cell is installed inside the casing, and the positive and negative electrode pins extend from the top of the cell in the same direction, the cell being formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, characterized in that: The positive electrode sheet consists of a positive electrode aluminum foil layer and a positive electrode coating layer, with the positive electrode coating layer coated on the surface of the positive electrode aluminum foil layer. The negative electrode sheet consists of a negative electrode aluminum foil layer and a lithium titanate coating layer, with the lithium titanate coating layer coated on the surface of the negative electrode aluminum foil layer.

2. The titanium capacitor battery according to claim 1, characterized in that: The positive electrode coating layer is composed of lithium cobalt oxide and lithium manganese oxide.

3. A titanium capacitor battery according to claim 1, characterized in that: The lower end of the positive electrode guide pin is riveted to the positive electrode tab, and the lower end of the negative electrode guide pin is riveted to the negative electrode tab. Both the positive and negative electrode tabs have multiple riveting points. The positive electrode tab is riveted to the positive electrode plate through the riveting points, and the negative electrode tab is riveted to the negative electrode plate of the battery cell through the riveting points.

4. A titanium capacitor battery according to claim 3, characterized in that: The cross-sectional shape of the rivet point is plum blossom-shaped or five-pointed star-shaped.

5. A titanium capacitor battery according to claim 1, characterized in that: An insulating rubber plug is fitted inside the upper part of the outer shell. The positive and negative electrode leads out of the insulating rubber plug in the same direction. A concave waistband is provided on the outer periphery of the outer shell. The waistband presses down on the side of the insulating rubber plug. The upper end of the outer shell is bent inward to form a sealing strip, which presses down on the upper surface of the insulating rubber plug.

6. A titanium capacitor battery according to claim 5, characterized in that: The waistband has a depth of 2-4mm and the closure tape has a length of 1-2mm.

7. A titanium capacitor battery according to any one of claims 1-6, characterized in that: Rated voltage is 2.7V or 3.0V, high plateau voltage is 2.2-2.9V, energy density is 90Wh / Kg, and self-discharge rate is <10% per year.

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