Ultra-small diamond-shaped hole metal mesh foil battery current collector

Abstract

The utility model discloses a current collector of an ultra-small diamond-shaped hole metal mesh foil battery, which is made of metal foils required by various batteries by adopting a net cutting and drawing process and comprises metal foil ribs and diamond-shaped meshes, the metal foil ribs are mutually staggered to form a plurality of rhombic meshes, and the rhombic meshes are uniformly distributed on the metal mesh foil battery current collector. The novel current collector with the ultrathin and ultramicro rhombic meshes has the beneficial effects that the novel current collector is small in internal resistance, obviously improves the electricity storage and discharge performance efficiency, has a larger electrochemical effective area in contact with active substances, improves the reaction efficiency of the electricity storage and discharge reaction, is lower in energy consumption ratio and better in conversion ratio, has stronger reaction stability, and is suitable for large-scale popularization and application. The use safety is higher, and meanwhile, the cycle service life of the current collector is greatly prolonged. The method is wide in application range and suitable for manufacturing various batteries such as lithium batteries, sodium batteries, lead-acid batteries and nickel-metal hydride batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of the current collector structure of chemical batteries, and more specifically, to an ultra-small size diamond-hole metal mesh foil battery current collector. Background Art

[0002] The current collector is an important part of the positive and negative electrodes of the battery cells of various chemical batteries. As a component structure for collecting current, its function is to carry the active substances of the positive and negative electrodes, and collect the current generated by the chemical reaction of the active substances to form a larger current for external output, so as to complete the conversion process of chemical energy into electrical energy.

[0003] At present, the current collectors of various chemical batteries (such as lithium batteries, sodium batteries, lead-acid batteries, etc.) mainly use metal foils as the basis of the current collector, and the current collector is manufactured by the gravity casting method and the lead strip punching method.

[0004] The surface area of the battery current collector manufactured by the above-mentioned existing technology is small, and the electrochemically effective area that can contact the active substances participating in the reaction is small, resulting in fewer active substances that can participate in the reaction to generate current in the charge and discharge reaction, affecting the electric energy conversion efficiency. In addition, the existing battery current collector has a large thickness and high internal resistance, which directly affects the charge and discharge performance efficiency, has a high energy consumption ratio, poor stability, is easy to be damaged after a certain number of charge and discharge cycles, has a low reuse rate, and cannot meet the sustainable application requirements of current various batteries. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies existing in the structure of the existing battery current collector, and provide an ultra-small size diamond-hole metal mesh foil battery current collector with high conductivity, ultra-thin internal resistance and good stability.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] An ultra-small size diamond-hole metal mesh foil battery current collector is respectively made of a metal foil applicable to the battery as a base material, and metal foil ribs are made by a cutting and drawing process. The metal foil ribs are overlapped and staggered with each other to form a number of diamond-shaped mesh holes, and the diamond-shaped mesh holes are evenly distributed on the metal mesh foil battery current collector.

[0008] Further, the side length of the diamond-shaped mesh hole is 0.01 mm - 0.5 mm.

[0009] Preferably, the side length of the diamond-shaped mesh hole is 0.01 mm - 0.4 mm.

[0010] Further, the thickness of the metal mesh foil battery current collector is 0.02 mm - 0.5 mm.

[0011] Preferably, the thickness of the metal mesh foil battery current collector is 0.02 mm - 0.09 mm.

[0012] Furthermore, the width of the metal foil ribs of the diamond-shaped mesh holes is 0.02 mm - 0.5 mm.

[0013] Preferably, the width of the metal foil ribs of the diamond-shaped mesh holes is 0.02 mm - 0.19 mm.

[0014] Furthermore, the battery includes various types of batteries such as lithium batteries, sodium batteries, lead-acid batteries, nickel-metal hydride batteries, etc.

[0015] Furthermore, the metal foil includes current collector metals for batteries such as lead and lead alloys, copper and copper alloys, aluminum and aluminum alloys, nickel and nickel alloys, titanium and titanium alloys, iron and iron alloys, etc.

[0016] During production, first roll the above metal foil into a metal foil with a thickness of 0.02 mm - 0.09 mm, and then use a numerically controlled cutting and stretching machine to cut and stretch the metal foil into diamond-shaped mesh holes with a mesh hole side length of (0.01 mm - 0.4 mm) × (0.01 mm - 0.4 mm). The width of the metal foil ribs of the diamond-shaped mesh holes is controlled within 0.02 mm - 0.19 mm, so that the surface area of the metal mesh foil current collector is increased by more than 10 - 20 times compared with the current collector of the prior art.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] The ultra-small size diamond-shaped hole metal mesh foil battery current collector provided by the present utility model realizes a new type of current collector with ultra-thin and ultra-fine diamond-shaped mesh holes through structural improvement. It has a small internal resistance, significantly improves the charge and discharge performance efficiency, and under the premise of ensuring the normal progress of the reaction, the structural design of the ultra-fine diamond-shaped mesh holes greatly increases the surface area of the battery current collector, making the electrochemical effective area in contact with the active substance larger, enabling more sufficient reactive substances to adhere, improving the reaction efficiency of the charge and discharge reaction, having a lower energy consumption ratio, a better conversion ratio, stronger reaction stability, higher use safety, and also greatly extending the cycle service life of the current collector.

[0019] Effective laboratory experimental tests show that the deep discharge cycle life of various batteries using the ultra-small size diamond-shaped hole metal mesh foil battery current collector provided by the present utility model reaches more than 10,000 times, which is more than 20 - 60 times that of existing batteries, achieving a breakthrough in the battery charge and discharge technical functions. The provided ultra-small size diamond-shaped hole metal mesh foil battery current collector has a wide range of applications and is suitable for the manufacture of various batteries such as lithium batteries, sodium batteries, lead-acid batteries, nickel-metal hydride batteries, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present utility model.

[0021] Figure 2 This is the schematic structural diagram of part A of the present utility model.

[0022] Figure 3 This is the schematic structural diagram of the local diamond-shaped mesh hole of the present utility model. Specific embodiments

[0023] The present utility model will be further described below in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0024] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The present utility model will be further described below in conjunction with specific embodiments and the attached drawings:

[0026] Figures 1 to 3 This is the schematic structural diagram of the present utility model. Further, the present utility model is an ultra-small size diamond-hole metal mesh foil battery current collector, which is respectively made of a metal foil applicable to the battery as the base material, and the metal foil rib 1 is made by the cutting and drawing process. The metal foil ribs 1 are overlapped and staggered with each other to form a number of diamond-shaped mesh holes 2, and the diamond-shaped mesh holes 2 are evenly distributed on the metal mesh foil battery current collector.

[0027] Further, the side length of the diamond-shaped mesh hole 2 is 0.01 mm - 0.5 mm.

[0028] Preferably, the side length of the diamond-shaped mesh hole 2 is 0.01 mm - 0.4 mm.

[0029] Further, the thickness of the metal mesh foil battery current collector is 0.02 mm - 0.5 mm.

[0030] Preferably, the thickness of the metal mesh foil battery current collector is 0.02 mm - 0.09 mm.

[0031] Furthermore, the width of the metal foil rib 1 of the diamond-shaped mesh hole 2 is 0.02 mm - 0.5 mm.

[0032] Preferably, the width of the metal foil rib 1 of the diamond-shaped mesh hole 2 is 0.02 mm - 0.19 mm.

[0033] Furthermore, the battery includes various batteries such as lithium batteries, sodium batteries, lead-acid batteries, nickel-metal hydride batteries, etc.

[0034] Furthermore, the metal foil includes battery current collector metals such as lead and lead alloys, copper and copper alloys, aluminum and aluminum alloys, nickel and nickel alloys, titanium and titanium alloys, iron and iron alloys, etc.

[0035] During production, first roll the above metal foil into a metal foil with a thickness of 0.02 mm - 0.09 mm, and then use a numerically controlled cutting and stretching machine to cut and stretch the metal foil into a diamond-shaped mesh hole 2 with a mesh hole side length of (0.01 mm - 0.4 mm) × (0.01 mm - 0.4 mm). The width of the metal foil rib 1 of the diamond-shaped mesh hole 2 is controlled within 0.02 mm - 0.19 mm, so that the surface area of the current collector is increased by more than 10 - 20 times compared with the current collector of the prior art.

[0036] First Embodiment:

[0037] In this embodiment, first use a numerically controlled cutting and stretching machine to process an oxygen-free copper foil with a thickness of 0.03 mm and a width of 300 mm into metal foil ribs 11 with a width of 0.05 mm. Stack and interleave the metal foil ribs 11 with a width of 0.05 mm to form a copper mesh foil battery current collector uniformly distributed with diamond-shaped mesh holes 2 having a side length of 0.05 mm × 0.05 mm.

[0038] Use a high-speed roller flattening machine to flatten the formed copper mesh foil battery current collector to a thickness of 0.035 mm, and a negative copper mesh foil battery current collector for lithium batteries and sodium batteries can be made.

[0039] Second Embodiment:

[0040] This embodiment is similar to the first embodiment. The difference is that in this embodiment, first use a numerically controlled cutting and stretching machine to process an oxygen-free aluminum foil with a thickness of 0.035 mm and a width of 300 mm into metal foil ribs 11 with a width of 0.05 mm. Stack and interleave the metal foil ribs 11 with a width of 0.05 mm to form an aluminum mesh foil battery current collector uniformly distributed with diamond-shaped mesh holes 2 having a side length of 0.07 mm × 0.07 mm.

[0041] Use a high-speed roller flattening machine to flatten the formed copper mesh foil battery current collector to a thickness of 0.035 mm, and a positive aluminum mesh foil battery current collector for lithium batteries and sodium batteries can be made.

[0042] Third embodiment:

[0043] This embodiment is similar to the first embodiment, except that in this embodiment, a lead alloy foil with a thickness of 0.15 mm and a width of 300 mm is first processed into metal foil ribs 11 with a width of 0.15 mm by a CNC mesh cutting and drawing machine, and the metal foil ribs 11 with a width of 0.05 mm are overlapped and staggered to form a lead alloy mesh foil battery current collector composed of evenly distributed diamond mesh holes 2 with a side length of 0.40 mm×0.40 mm.

[0044] The assembled lead alloy mesh foil battery current collector is flattened to a thickness of 0.09 mm using a high-speed roller flattening machine to produce the positive and negative lead alloy mesh foil battery current collectors for lead-acid batteries.

[0045] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. An ultra-small diamond-shaped hole metal mesh foil battery current collector, which is made of metal foil ribs required for the battery by cutting and drawing the metal foil, characterized in that: It comprises a plurality of rhombus-shaped meshes formed by the metal foil ribs interlaced with each other, and the rhombus-shaped meshes are evenly distributed on the metal mesh foil battery current collector.

2. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 1, characterized in that: The side length of the diamond mesh is 0.01mm-0.5mm.

3. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 2, characterized in that: The side length of the diamond mesh is 0.01mm-0.4mm.

4. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 1, characterized in that: The thickness of the metal mesh foil battery current collector is 0.02mm-0.5mm.

5. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 4, characterized in that: The thickness of the metal mesh foil battery current collector is 0.02mm-0.09mm.

6. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 1, characterized in that: The width of the metal foil ribs of the diamond mesh is 0.02mm-0.5mm.

7. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 6, characterized in that: The width of the metal foil ribs of the diamond mesh is 0.02mm-0.19mm.

8. The ultra-small size diamond hole metal mesh foil battery current collector according to claim 1, characterized in that: The metal foils include battery current collector metals of lead and lead alloys, copper and copper alloys, aluminum and aluminum alloys, nickel and nickel alloys, titanium and titanium alloys, iron and iron alloys.

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