Copper-aluminum composite negative electrode with multi-layer hybrid configuration

Abstract

The utility model relates to a kind of copper-aluminum composite negative, specifically a kind of copper-aluminum composite negative of multilayer mixed configuration, the copper-aluminum composite negative includes copper column and the aluminum column being set on copper column, wherein copper column includes pedestal and the column body being set on pedestal, column body includes inner core body and the intermediate layer and outer surface layer being sequentially set on the outer side of inner core body, inner core body is installed to the upper end surface of pedestal, inner core body uses copper material, aluminum column includes aluminum structure part, and the combination layer is set in the aluminum structure part end close to column body, and aluminum structure part is installed to the upper end surface of column body, and aluminum structure part uses aluminum material.The copper-aluminum composite negative of multilayer mixed configuration has good thermal stability under high temperature, realizes higher theoretical specific capacity, can store more electric charge, improves the energy density of battery, increases the contact area between copper column and aluminum column, reduces the probability of welding drop, improves yield.

Description

Technical Field

[0001] This utility model relates to a copper-aluminum composite negative electrode, specifically a multilayer hybrid copper-aluminum composite negative electrode. Background Technology

[0002] Copper-aluminum composite anodes are a novel type of anode material, composed of copper and aluminum. They offer advantages such as high energy density, long cycle life, and low cost, making them a focus of attention in the lithium-ion battery field.

[0003] Existing copper-aluminum composite anode designs are flawed and structurally complex. The copper portion is typically made primarily of copper, but its outer surface lacks a protective structure, resulting in poor stability at high temperatures. Furthermore, the theoretical specific capacity of the copper pillar is low, storing less charge and leading to lower battery energy density. Additionally, the contact surface between the copper and aluminum portions in existing copper-aluminum composite anodes is planar, resulting in a small contact area and slightly lower structural stability. This leads to a certain probability of detachment during or after welding, reducing yield. Therefore, the inventors have improved the structure of a multi-layered hybrid copper-aluminum composite anode. Utility Model Content

[0004] The purpose of this invention is to provide a multilayer hybrid copper-aluminum composite negative electrode. This copper-aluminum composite negative electrode has the advantages of simple structure, reasonable design, good thermal stability at high temperature, high theoretical specific capacity, ability to store more charge, improved energy density of battery, increased contact area between copper and aluminum pillars, reduced probability of weld detachment, and improved yield. It solves the problems mentioned in the above technical background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multilayer hybrid copper-aluminum composite negative electrode, comprising a copper pillar and an aluminum pillar disposed on the copper pillar. The copper pillar includes a base and a column body disposed on the base. The column body includes an inner core and an intermediate layer and an outer layer disposed sequentially on the outer side of the inner core. The inner core is mounted on the upper end face of the base. The inner core is made of copper. The intermediate layer is composed of elemental nickel nanoparticles, which exhibit good thermal stability at high temperatures, thus improving the lifespan of the copper-aluminum composite negative electrode. The outer layer is composed of elemental silicon, which has a high theoretical specific capacity, enabling it to store more charge in the battery, thereby increasing the energy density of the battery. The aluminum pillar includes an aluminum structural part, with a bonding layer disposed at one end of the aluminum structural part near the column body. The aluminum structural part is mounted on the upper end face of the column body. The aluminum structural part is made of aluminum.

[0006] Preferably, the intermediate layer is disposed between the inner core and the outer surface layer, and the thickness of the intermediate layer gradually decreases from top to bottom. The intermediate layer adopts a non-exposed design, and the end of the intermediate layer closer to the aluminum structure is the end that plays a major role, so the thickness is larger. Conversely, the thickness of the end farther away from the aluminum structure is smaller, which can reduce the amount of material used.

[0007] Preferably, the thickness of the intermediate layer near the aluminum structure is between 2 mm and 5.5 mm, and the thickness of the layer away from the aluminum structure is between 0.8 mm and 1.8 mm.

[0008] Preferably, the thickness of the outer layer gradually decreases from top to bottom, and the bottom of the outer layer is located on the upper surface of the base, so that the outer layer can completely enclose the middle layer and protect the inner core and the middle layer. The thickness of the bottom of the outer layer is small, so that its shape is close to that of the middle layer, and therefore it can be better integrated with the middle layer.

[0009] Preferably, the thickness of the outer layer near the aluminum structure is between 2.5 mm and 6 mm, and the thickness of the outer layer away from the aluminum structure is between 0.5 mm and 1.5 mm.

[0010] Preferably, an extension is provided on the top of the inner core, the extension is located on the top of the intermediate layer and the outer layer, and the position of the extension also needs to be combined with the aluminum structure. The extension is provided in order to avoid the intermediate layer and the outer layer. The inner core and the extension have the same structure and become one piece.

[0011] Preferably, the bonding layer is arc-shaped and extends into the interior of the aluminum structure. Therefore, the bonding layer can increase the contact area between the column and the aluminum structure, making the connection between the column and the aluminum structure more tight during processing and less likely to fall off, thus improving the yield rate.

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

[0013] 1. This utility model provides a multilayer hybrid copper-aluminum composite negative electrode, which includes a copper pillar and an aluminum pillar disposed on the copper pillar. The overall structure is simple and reasonably designed. The copper pillar includes a base and a column body disposed on the base. The column body includes an inner core and an intermediate layer and an outer layer disposed sequentially on the outside of the inner core. The intermediate layer is composed of elemental nickel nanoparticles, which have good thermal stability at high temperatures and improve the lifespan of the copper-aluminum composite negative electrode. The outer layer is composed of elemental silicon, which has a high theoretical specific capacity, enabling it to store more charge in the battery, thereby improving the energy density of the battery.

[0014] 2. The copper pillar in this utility model includes an inner core, an intermediate layer and an outer layer. The thickness of the intermediate layer gradually decreases from top to bottom. Therefore, the intermediate layer not only enhances stability but also reduces the use of nickel material and lowers costs.

[0015] 3. The aluminum column in this utility model includes an aluminum structural part. A bonding layer is provided at one end of the aluminum structural part near the column body. The bonding layer is arc-shaped and extends into the interior of the aluminum structural part. Therefore, the bonding layer can increase the contact area between the copper column and the aluminum column. During processing, the connection between the column body and the aluminum structural part can be tighter, reducing the probability of weld failure. This improves the yield rate, makes it highly practical, and suitable for widespread use. Attached Figure Description

[0016] Figure 1 This is one of the schematic diagrams of an embodiment of the present utility model;

[0017] Figure 2 This is a second schematic diagram of an embodiment of the present utility model;

[0018] Figure 3 This utility model Figure 1 Sectional view of AA;

[0019] Figure 4 This utility model Figure 3 Enlarged view of B in the middle;

[0020] Figure 5 This utility model Figure 3 A magnified view of C.

[0021] The reference numerals and names in the figure are as follows: 1. Copper column; 11. Base; 12. Column body; 121. Inner core; 122. Intermediate layer; 123. Outer layer; 124. Extension; 2. Aluminum column; 21. Aluminum structural part; 22. Bonding layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0025] Please see Figure 1 One embodiment of this utility model is a multilayer hybrid copper-aluminum composite negative electrode, which includes a copper pillar 1 and an aluminum pillar 2 disposed on the copper pillar 1.

[0026] Please see Figure 2 The copper column 1 includes a base 11 and a column 12 disposed on the base 11, and the aluminum column 2 includes an aluminum structural part 21.

[0027] Please see Figures 3 to 4The column 12 includes an inner core 121 and an intermediate layer 122 and an outer layer 123 sequentially disposed outside the inner core 121. The inner core 121 is mounted on the upper surface of the base 11. The inner core 121 is made of copper. The intermediate layer 122 is composed of elemental nickel nanoparticles, which have good thermal stability at high temperatures, improving the lifespan of the copper-aluminum composite negative electrode. The outer layer 123 is composed of elemental silicon, which has a high theoretical specific capacity, allowing it to store more charge in the battery, thereby increasing the battery's energy. The density of the intermediate layer 122 is such that it is disposed between the inner core 121 and the outer layer 123, and the thickness of the intermediate layer 122 gradually decreases from top to bottom. The intermediate layer 122 is designed not to be exposed, and the end of the intermediate layer 122 closer to the aluminum structure part 21 is the end that plays a major role, so its thickness is larger. Conversely, the end farther away from the aluminum structure part 21 has a smaller thickness, which can reduce the amount of material used. The thickness of the intermediate layer 122 at the end closer to the aluminum structure part 21 is between 2mm and 5.5mm, and the thickness at the end farther away from the aluminum structure part 21 is smaller. The thickness of one end of the outer layer 123 is between 0.8mm and 1.8mm. Furthermore, the thickness of the outer layer 123 gradually decreases from top to bottom, and the bottom of the outer layer 123 is located on the upper surface of the base 11. This allows the outer layer 123 to completely enclose the middle layer 122, protecting both the inner core 121 and the middle layer 122. The smaller thickness at the bottom of the outer layer 123 makes its shape similar to that of the middle layer 122, thus allowing for better bonding with the middle layer 122. The outer layer 123 is located near the aluminum structure portion 21. The thickness at one end is between 2.5mm and 6mm, and the thickness at the end away from the aluminum structure 21 is between 0.5mm and 1.5mm. An extension 124 is provided on the top of the inner core 121. The extension 124 is located on the top of the intermediate layer 122 and the outer layer 123. The position of the extension 124 also needs to be combined with the aluminum structure 21. The extension 124 is provided to avoid the intermediate layer 122 and the outer layer 123. The inner core 121 and the extension 124 have the same structure and become one piece.

[0028] Please see Figure 5 A bonding layer 22 is provided at one end of the aluminum structure part 21 near the column 12, and the aluminum structure part 21 is installed on the upper end face of the column 12. The aluminum structure part 21 is made of aluminum, and the bonding layer 22 is arc-shaped and extends into the interior of the aluminum structure part 21. Therefore, the bonding layer 22 can increase the contact area between the column 12 and the aluminum structure part 21. During processing, the connection between the column 12 and the aluminum structure part 21 can be made tighter and less likely to fall off, thus improving the yield rate.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-layer hybrid configuration of copper-aluminum composite anode, characterized by: The system includes a copper column (1) and an aluminum column (2) disposed on the copper column (1). The copper column (1) includes a base (11) and a column body (12) disposed on the base (11). The column body (12) includes an inner core (121) and an intermediate layer (122) and an outer layer (123) disposed sequentially on the outside of the inner core (121). The inner core (121) is installed on the upper end face of the base (11). The aluminum column (2) includes an aluminum structural part (21). The aluminum structural part (21) has a bonding layer (22) disposed at one end near the column body (12), and the aluminum structural part (21) is installed on the upper end face of the column body (12).

2. The multi-layer hybrid configuration copper-aluminum composite anode according to claim 1, characterized in that: The intermediate layer (122) is disposed between the inner core (121) and the outer layer (123), and the thickness of the intermediate layer (122) gradually decreases from top to bottom.

3. The multi-layer hybrid configuration copper-aluminum composite anode according to claim 2, characterized in that: The thickness of the intermediate layer (122) near the aluminum structure part (21) is between 2 mm and 5.5 mm, and the thickness of the end away from the aluminum structure part (21) is between 0.8 mm and 1.8 mm.

4. The multi-layer hybrid configuration copper-aluminum composite anode according to claim 1, characterized in that: The thickness of the outer layer (123) gradually decreases from top to bottom, and the bottom of the outer layer (123) is located on the upper surface of the base (11).

5. The multi-layer hybrid configuration copper-aluminum composite anode according to claim 4, characterized in that: The thickness of the outer layer (123) near the aluminum structure (21) is between 2.5 mm and 6 mm, and the thickness of the outer layer (123) away from the aluminum structure (21) is between 0.5 mm and 1.5 mm.

6. The multi-layer hybrid configuration copper-aluminum composite anode according to claim 1, characterized in that: The inner core (121) has an extension (124) at its top, which is located on the top of the intermediate layer (122) and the outer layer (123).

7. The copper-aluminum composite negative electrode with a multilayer hybrid configuration according to claim 1, characterized in that: The bonding layer (22) is arc-shaped and extends toward the interior of the aluminum structure (21).

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