Method for manufacturing battery positive electrode, battery and electronic product

Abstract

The present invention provides a method for manufacturing a battery positive electrode, a battery, and an electronic product. The method for manufacturing a battery positive electrode includes: providing an exhaust hole on a first metal plate; superimposing the first metal plate, an insulating layer, and a second metal plate, and pressing the plates; disposing a pressing plate on a side of the first metal plate away from the second metal plate, the pressing plate having a clearance hole, the clearance hole and the exhaust hole being arranged opposite each other in the thickness direction of the first metal plate, and a first pattern being located within the projection of the clearance hole on the first metal plate; using a laser to etch a first pattern on the first metal plate, a second pattern on the second metal plate, and an insulating layer, the first pattern having a center hole located at the exhaust hole, the center hole having an area larger than the exhaust hole, and the first pattern, the second pattern, and the insulating layer between the first and second patterns forming the battery positive electrode. This manufacturing method ensures a flat, bubble-free surface on the pressed plates, while preventing warping and deformation of the plates during etching.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a method for manufacturing a battery positive electrode, a battery and an electronic product. Background Art

[0002] Currently, my country is the world's largest lithium battery manufacturing base and the second-largest producer and exporter of lithium batteries, accounting for 40% of the global market share. With the rapid development of industries such as mobile phones, laptops, digital cameras, electric vehicles, power tools, and new energy vehicles, demand for lithium batteries will continue to grow. Furthermore, technological innovations by lithium battery manufacturers will continue to drive this demand. In the era of intelligent development, smart devices must have smaller power supplies, longer battery life, and be thinner, lighter, and more flexible.

[0003] There is a double-sided stainless steel-based laminate for lithium batteries, which has the characteristics of excellent thermal conductivity, high pressure resistance, not easy to rust, and excellent corrosion resistance. It greatly meets the high-end needs of the smart power market and has important strategic significance for the company in new technology development, production capacity improvement and new product market promotion.

[0004] However, there are two existing methods for manufacturing double-sided stainless steel-based laminates. One involves pressing two pure stainless steel sheets before etching the pattern. This prevents internal gas from escaping after pressing, leading to bubbles and negatively impacting lithium battery performance. The other involves etching the pattern on both sides before pressing, which can lead to misalignment during lamination, resulting in misalignment of the patterns on the upper and lower sides of the laminated panels and severe misalignment. Furthermore, when laser etching the pattern and the in-hole insulation layer on existing double-sided stainless steel laminates, the high laser temperature and intensity can cause the laminated panels to warp, partially etch the in-hole insulation layer, or misalign the hole walls. Summary of the Invention

[0005] The first object of the present invention is to provide a method for manufacturing a battery positive electrode that can ensure that the pressed plate surface is flat and free of bubbles, while preventing the plate from warping and deforming during the etching process.

[0006] A second object of the present invention is to provide a battery comprising a positive electrode manufactured using the above manufacturing method.

[0007] A third object of the present invention is to provide an electronic product using the battery.

[0008] To achieve the above-mentioned first purpose, the present invention provides a method for manufacturing a battery positive electrode, comprising: providing an exhaust hole on a first metal plate; overlapping and pressing the first metal plate, an insulating layer, and a second metal plate, with the insulating layer being located between the first metal plate and the second metal plate; providing a pressing plate on a side of the first metal plate away from the second metal plate, with a clearance hole provided on the pressing plate, the clearance hole and the exhaust hole being arranged relative to each other in the thickness direction of the first metal plate, and the first figure being located within the projection of the clearance hole on the first metal plate; using a laser to etch a first figure on the first metal plate, etching a second figure on the second metal plate, and etching the insulating layer, the first figure having a center hole, the center hole being located at the exhaust hole, the area of ​​the center hole being larger than the area of ​​the exhaust hole, and the first figure, the second figure, and the insulating layer between the first figure and the second figure forming the battery positive electrode.

[0009] As can be seen from the above scheme, by covering a pressing plate on the first metal plate, the problem of plate warping and deformation caused by high temperature and high strength during laser etching is solved. At the same time, by first opening an exhaust hole on the first metal plate, the problem of bubbles generated during pressing can be prevented during the process of superimposing the first metal plate, the insulating layer and the second metal plate and pressing. At the same time, since the exhaust hole is located in the center hole of the first figure, when the center hole is subsequently etched at the center hole position, the exhaust hole will be etched away, which will not affect the number of positive battery electrodes on the metal-based pressed plate, thereby rationally and maximizing the use of the metal-based pressed plate and reducing costs. In addition, the production method is to press first and then etch the figure, which can avoid the problem of inaccurate figure alignment and serious deviation when the figure is etched on both sides and then pressed. In addition, the use of laser etching can ensure that the edge of the figure is free of burrs, thereby solving the problem of deformation and uneven thickness of stainless steel sheets due to mechanical grinding due to burrs, and ensuring the stability of the product's external dimensions. The battery positive electrode manufactured by the above-mentioned manufacturing method adopts a structure in which an insulating layer is sandwiched between two metal plates, which reduces the volume of the button lithium battery when it is energized. Moreover, through the good heat dissipation of metal materials such as stainless steel and the good thermal conductivity of the insulating layer, the combined force is better, there is no stratification or decomposition during processing, and the high temperature resistance is better. The second metal plate made of metal material can be stamped into a special shape, and is more ductile. It will not fail in long-term use in contact with the electrolyte and has strong corrosion resistance, ensuring that the button lithium battery product will not have a shortened life due to long-term work heat. The result of the product's constant temperature and humidity anti-aging test is more than 5000 hours.

[0010] A preferred solution is that the size of the pressing plate is larger than that of the first metal plate, and the outer edges of the pressing plate are all located outside the first metal plate.

[0011] It can be seen that the size of the pressing plate is larger than that of the first metal plate, which can ensure that the edge of the first metal plate will not warp.

[0012] A preferred solution is that a pressure plate positioning hole is also provided on the pressure plate, and the pressure plate positioning hole is arranged close to the edge of the pressure plate, a first positioning hole is provided on the first metal plate, and a second positioning hole is provided on the second metal plate. The pressure plate positioning hole, the first positioning hole and the second positioning hole are arranged along the thickness direction of the first metal plate, and the positioning piece passes through the pressure plate positioning hole, the first positioning hole and the second positioning hole.

[0013] It can be seen that by setting positioning holes on the pressure plate, the first metal plate and the second metal plate, and fixing the three through positioning parts, it is convenient to achieve precise positioning between the three, and ensure precise positioning between the clearance hole and the first pattern. The size of the clearance hole is larger than the size of the first pattern, which can prevent the dielectric layer in the center hole from being not etched cleanly.

[0014] A further solution is that the number of the pressure plate positioning holes, the first positioning holes and the second positioning holes are all more than two, the pressure plate positioning holes, the first positioning holes and the second positioning holes are arranged in a one-to-one correspondence, and the various pressure plate positioning holes are arranged along the circumference of the pressure plate.

[0015] This shows that multiple positioning holes can further improve positioning accuracy and connection stability.

[0016] A preferred solution is that the pressure plate is made of copper; and / or the first metal plate and the second metal plate are made of stainless steel; and / or the thermal conductivity of the insulating layer is in the range of 2 W / m·°C to 5 W / m·°C.

[0017] It can be seen that the copper plate has good thermal conductivity, which prevents high temperature from affecting the first metal plate and the second metal plate. The insulation layer has high thermal conductivity and good thermal conductivity, thereby improving the performance of the battery.

[0018] A preferred solution is that the first pattern and the exhaust hole are arranged cocentrically.

[0019] This shows that a more reasonable layout can be achieved, thereby improving the material utilization rate of each metal plate.

[0020] A preferred solution is that the insulating layer is an adhesive film; in the laminating step, the adhesive film is adhered to one of the first metal plate and the second metal plate, and then the other of the first metal plate and the second metal plate is laminated on the adhesive film.

[0021] It can be seen that by making the insulating layer into a film in advance, the uniformity and consistency of the film thickness can be ensured, thereby ensuring the performance of the battery product.

[0022] A preferred solution is that after the etching step, the manufacturing method further includes a stamping step; the stamping step includes: applying pressure toward the second figure, the middle part of the second figure protrudes toward the first figure and passes through the center hole, and the positive electrode of the battery is separated from the first metal plate and the second metal plate.

[0023] To achieve the above second purpose, the present invention provides a battery, including a battery positive electrode and a battery negative electrode, and the battery positive electrode is manufactured using the above manufacturing method.

[0024] To achieve the third objective, the present invention provides an electronic product comprising the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram and a partially enlarged diagram of a metal-based pressed plate in an embodiment of the method for manufacturing a battery positive electrode of the present invention.

[0026] Figure 2 It is a top view and a partially enlarged view of the metal-based pressing plate and the pressing plate in the embodiment of the method for manufacturing the battery positive electrode of the present invention.

[0027] Figure 3 It is a cross-sectional view of a metal-based pressed plate and a pressing plate in an embodiment of a method for manufacturing a positive electrode of a battery of the present invention.

[0028] Figure 4 1 is a top view of a battery embodiment of the present invention.

[0029] Figure 5 is a cross-sectional view of an embodiment of a battery of the present invention.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0031] See also Figures 1 to 5 The electronic product in this embodiment includes a battery 100. The battery 100 is a button lithium battery. The battery 100 includes a positive electrode 101 and a negative electrode 102. Figure 1 The metal base pressed plate 103 is formed by stamping and separating.

[0032] The steps of the method for manufacturing the battery positive electrode 101 include:

[0033] First, a plurality of circular exhaust holes 11 are opened on the first metal plate 1 .

[0034] Next, the first metal plate 1, insulating layer 3, and second metal plate 2 are stacked and pressed, with the insulating layer 3 positioned between the first and second metal plates 1 and 2. The insulating layer 3 is a film. During this stacking step, the film 3 is attached to one of the first and second metal plates 1 and 2, and then the other is stacked onto the film 3, completing the stacking of the first metal plate 1, insulating layer 3, and second metal plate 2. The thickness of each of the first and second metal plates is 0.2 mm.

[0035] Then, a pressure plate 4 is set on the side of the first metal plate 1 away from the second metal plate 2. The size of the pressure plate 4 is larger than that of the first metal plate 1. The outer edges of the pressure plate 4 are all located on the outside of the first metal plate 1. The thickness of the pressure plate 4 is 1 mm. The pressure plate 4 is provided with a circular clearance hole 41 and a pressure plate positioning hole 42. The clearance hole 41 and the exhaust hole 11 are arranged opposite to each other in the thickness direction of the first metal plate 1. The pressure plate positioning hole 42 is set close to the edge of the pressure plate 4. The first metal plate 1 is provided with a first positioning hole 12, and the second metal plate 2 is provided with a second positioning hole (not shown). The pressure plate positioning hole 42, the first positioning hole 12 and the second positioning hole are arranged along the thickness direction of the first metal plate 1. Positioning parts such as pins (not shown) pass through the pressure plate positioning hole 42, the first positioning hole 12 and the second positioning hole to fix the pressure plate 4, the first metal plate 1 and the second metal plate 2 together. The number of the pressure plate positioning holes 42, the first positioning holes 12 and the second positioning holes are all four, and the pressure plate positioning holes 42, the first positioning holes 12 and the second positioning holes are arranged one by one. Each pressure plate positioning hole 42 is arranged along the circumference of the pressure plate 4, each first positioning hole 12 is arranged along the circumference of the first metal plate 1, and each second positioning hole is arranged along the circumference of the second metal plate 2.

[0036] Next, a laser is used to etch multiple first patterns 13 on the first metal plate 1, multiple second patterns 23 on the second metal plate 2, and the insulating layer 3. The first pattern 13 is annular, with a center hole 131 located at the exhaust hole 11. The clearance hole 41, the first pattern 13, and the exhaust hole 11 are cocentrically arranged. The diameter of the center hole 131 is greater than the diameter of the corresponding exhaust hole 11. The number of exhaust holes 11 is greater than or equal to the number of first patterns 13. The first pattern 13 is located within the projection of the clearance hole 41 on the first metal plate 1, and the outer diameter of the first pattern 13 is smaller than the diameter of the clearance hole 41. One first pattern 13 and one second pattern 23 are arranged opposite each other in the thickness direction. One first pattern 13, one second pattern 23, and the insulating layer 3 between the first and second patterns 13 and 23 form a battery positive electrode 101.

[0037] Next, a stamping step is performed, in which the punch of the stamping die applies pressure toward the second figure 23, and the middle part of the second figure 23 protrudes toward the first figure 13 to form a contact protrusion 231. The contact protrusion 231 passes through the center hole 131, and the material in the center hole 131 is separated from the first metal plate 1 under the action of the contact protrusion 231. At the same time, the battery positive electrode 101 is separated from the metal-based pressed plate 103.

[0038] The pressing plate 4 is made of copper, the first metal plate 1 and the second metal plate 2 are made of 316 high-quality stainless steel, and the thermal conductivity of the insulating layer 3 is in the range of 2 W / m·degree to 5 W / m·degree.

[0039] As can be seen from the above, by first opening an exhaust hole on the first metal plate, the problem of bubbles generated during pressing can be prevented during the process of stacking and pressing the first metal plate, the insulating layer and the second metal plate. At the same time, since the exhaust hole is located in the center hole of the first figure, when the center hole is subsequently etched at the center hole position, the exhaust hole will be etched away, which will not affect the number of positive battery electrodes on the metal-based pressed plate, thereby rationally and maximizing the use of the metal-based pressed plate and reducing costs. At the same time, by covering a pressing plate on the first metal plate, the problem of plate warping and deformation caused by high temperature and high strength during laser etching is solved. In addition, the production method is to press first and then etch the figure, which can avoid the problem of inaccurate figure alignment and serious deviation when the figure is etched on both sides and then pressed. In addition, the use of laser etching can ensure that the edge of the figure is free of burrs, thereby solving the problem of deformation and uneven thickness of stainless steel sheets due to mechanical grinding due to burrs, and ensuring the stability of the product's external dimensions. The second metal plate made of metal material can be stamped into a special shape, which is more ductile. It will not fail in long-term contact with electrolyte and has strong corrosion resistance, ensuring that the button lithium battery product will not have a shortened life due to long-term work and heat. The result of the product's constant temperature and humidity anti-aging test is more than 5000 hours, thus ensuring the long-term stable and effective operation of electronic products. It is widely used in various fields such as ships, automobiles, energy, petrochemicals, environmental protection, medical care, and catering.

[0040] Furthermore, the number of the pressure plate positioning holes, the first positioning holes, and the second positioning holes can each be two or more, and the number, size, and arrangement of each positioning hole can be modified as needed. The shape, number, and arrangement of the heat dissipation holes, the first pattern, and the second pattern on the metal-based pressboard can also be modified as needed. These modifications can also achieve the objectives of the present invention.

[0041] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for manufacturing a positive electrode of a battery, characterized in that: include: A plurality of exhaust holes are provided on the first metal plate; stacking and pressing the first metal plate, the insulating layer, and the second metal plate, wherein the insulating layer is located between the first metal plate and the second metal plate; A pressing plate is provided on a side of the first metal plate away from the second metal plate, wherein a plurality of clearance holes are formed on the pressing plate, and the clearance holes and the corresponding exhaust holes are arranged opposite to each other in the thickness direction of the first metal plate; A laser is used to etch multiple first patterns on the first metal plate, multiple second patterns on the second metal plate, and the insulating layer. The first pattern has a central hole, which is located at the corresponding exhaust hole. The area of ​​the central hole is larger than the area of ​​the corresponding exhaust hole. The first pattern is located within the projection of the clearance hole on the first metal plate. One first pattern, one second pattern, and the insulating layer between the first pattern and the second pattern form a positive electrode of the battery.

2. The production method according to claim 1, characterized in that: The size of the pressing plate is larger than that of the first metal plate, and outer edges of the pressing plate are all located outside the first metal plate.

3. The production method according to claim 1, characterized in that: A pressure plate positioning hole is also provided on the pressure plate, and the pressure plate positioning hole is arranged close to the edge of the pressure plate. A first positioning hole is provided on the first metal plate, and a second positioning hole is provided on the second metal plate. The pressure plate positioning hole, the first positioning hole and the second positioning hole are arranged along the thickness direction of the first metal plate, and the positioning piece passes through the pressure plate positioning hole, the first positioning hole and the second positioning hole.

4. The production method according to claim 3, characterized in that: The number of the pressure plate positioning holes, the first positioning holes and the second positioning holes is more than two, the pressure plate positioning holes, the first positioning holes and the second positioning holes are arranged in a one-to-one correspondence, and each of the pressure plate positioning holes is arranged along the circumference of the pressure plate.

5. The production method according to any one of claims 1 to 4, characterized in that: The pressing plate is made of copper; and / or The first metal plate and the second metal plate are made of stainless steel; and / or The thermal conductivity of the insulating layer is in the range of 2 W / m·degree to 5 W / m·degree.

6. The production method according to any one of claims 1 to 4, characterized in that: The first figure and the exhaust hole are arranged cocentrically.

7. The production method according to any one of claims 1 to 4, characterized in that: The insulating layer is a film; In the laminating step, the adhesive film is laminated on one of the first metal plate and the second metal plate, and then the other of the first metal plate and the second metal plate is laminated on the adhesive film.

8. The production method according to any one of claims 1 to 4, characterized in that: After the etching step, the manufacturing method further includes a stamping step; The stamping step includes applying pressure toward the second pattern, so that the middle portion of the second pattern protrudes toward the first pattern and passes through the center hole, and the battery positive electrode is separated from the first metal plate and the second metal plate.

9. A battery comprising a positive electrode and a negative electrode, characterized in that: The battery positive electrode is manufactured using the manufacturing method according to any one of claims 1 to 8.

10. Electronic products, characterized in that, Comprising the battery of claim 9.

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