Manufacturing method of all-electric button cell

Abstract

The invention discloses a manufacturing method of an all-electric button cell. The manufacturing method comprises the following steps: A1, manufacturing a shell: manufacturing the shell by adopting all metal or metal and plastic; a2, preparing positive and negative electrode slurry; a3, manufacturing a positive electrode cover group and a negative electrode cover group; a4, filling is carried out; a5, drying and processing; a6, pressing is conducted; a7, soaking; a8, diaphragm processing; and A9, forming. According to the invention, the metal shell bottom is directly adopted as the current collector and injected into the positive and negative active substances and the shell, and the positive and negative cover groups and the diaphragm are assembled, stamped or subjected to ultrasonic welding forming, so that secondary baking of a conventional pole group is abandoned, and one-time forming is adopted, so that the cost is greatly reduced, and the production efficiency is improved; meanwhile, the internal space of the all-electric button cell produced by the method is utilized to the maximum extent, so that the internal space becomes an effective energy space, and the capacity of the cell is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and in particular to a method for manufacturing a fully electric button-type battery. Background Art

[0002] With the advancement of technology, people are using batteries more and more widely, and the demand for battery capacity is also increasing. However, due to the constraints of raw materials, battery capacity is ultimately limited. Exploiting more effective space within a limited space has become one of the creative fields of designers. This is especially true for small and micro button batteries. Button batteries, also known as button batteries, are batteries with the appearance of a small button. Generally speaking, they are larger in diameter and thinner in thickness (compared to cylindrical batteries such as the AA batteries on the market). Button batteries are classified based on their appearance. The corresponding battery categories are cylindrical batteries, square batteries, and special-shaped batteries.

[0003] In the prior art, for small and micro button batteries, it is more difficult to utilize the space during actual production due to the narrow inner cavity space, resulting in low effective space utilization and small capacity, which is a common problem of button batteries. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for manufacturing a fully electric button-type battery to solve the problem raised in the above-mentioned background technology that for small and micro button-type batteries, it is more difficult to utilize the space during actual production due to the narrow internal cavity space, resulting in low effective space utilization and small capacity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for manufacturing a fully electric button battery, comprising the following steps:

[0006] A1. Shell production: The shell is made of all metal or metal plus plastic;

[0007] A2. Preparation of positive and negative electrode slurries;

[0008] A3, production of positive and negative electrode cover assembly;

[0009] A4, filling;

[0010] A5. Drying processing;

[0011] A6, pressing;

[0012] A7, soak;

[0013] A8, diaphragm processing;

[0014] A9. Molding.

[0015] Preferably, in the step A1, when all-metal button batteries are used, the following steps are specifically included:

[0016] S1. Shell production: Use metal materials to make the upper cover and lower cover, roughen the metal of the upper cover and lower cover, and use the metal of the upper cover and lower cover bottom as the current collector;

[0017] S2. Preparation of positive and negative electrode slurries: 0.5-5% carbon nanotubes are added to the positive and negative electrode slurries to ensure the ion flow rate, increase the distance between the active material and the current collector, and enable the active materials of the positive and negative electrode groups to be deposited thicker;

[0018] S3. Fabrication of positive and negative electrode cover assemblies: According to the gram capacity of the active material, the positive electrode slurry and the negative electrode slurry are directly injected into the upper and lower cover cavities respectively. Following the design principles of lithium-ion batteries, the gram capacity of the active material is such that the negative electrode is greater than the positive electrode by more than 3% of the slurry amount injected, and the positive electrode cover assembly and the negative electrode cover assembly are respectively fabricated;

[0019] S4. Filling: Place the positive electrode cap assembly and the negative electrode cap assembly on an ultrasonic vibrator for filling and vibration to remove bubbles and ensure that the interior is fully filled;

[0020] S5. Drying process: Place the positive electrode cap assembly and the negative electrode cap assembly into a vacuum oven and bake for 1-24 hours to thoroughly dry the active material and to allow the functional groups of the binder colloid to undergo secondary recombination, thereby increasing the softness of the colloid and preventing the powder from falling off.

[0021] S6. Pressing: Place the baked positive electrode cap assembly and negative electrode cap assembly into a hydraulic press to squeeze the material in the cap cavity to reach the designed thickness;

[0022] S7. Soaking: Soak the positive electrode cover assembly and the negative electrode cover assembly in a sealed and dry space filled with electrolyte for 24 hours;

[0023] S8, diaphragm processing: Use a mold to cut the diaphragm into a circular diaphragm with a size of the outer diameter of the upper cover + 1mm, and soak it in a closed and dry space for 10 minutes to allow the diaphragm to absorb the electrolyte to reach saturation;

[0024] S9, molding: Assemble the positive electrode cover assembly, negative electrode cover assembly, sealing ring, and diaphragm in a closed and dry space, and use a punching machine to punch so that the upper cover and the lower cover are sealed and pressed.

[0025] Preferably, in step S1, the manufacturing method of the upper cover and the lower cover is:

[0026] S11, using a punching and cutting device to cut the metal sheet into the required size;

[0027] S12, using a stamping device to stamp the cut metal plate into an upper cover and a lower cover;

[0028] S13. Use a grinding device to grind the bottom of the upper cover and the lower cover to form a rough surface.

[0029] Preferably, in step S5, the temperature of the vacuum oven is set to 100-250°C.

[0030] Preferably, in step S7, the temperature in the space is set to 45-50°C.

[0031] Preferably, in step A1, when metal and plastic are used to make a button battery, the following steps are specifically included:

[0032] T1. Shell production: Assemble the metal sheet and plastic ring to form the upper cover and lower cover. Roughen one side of the metal sheet. The metal sheet at the bottom of the cover is used as the current collector.

[0033] T2. Preparation of positive and negative electrode slurries: 0.5-5% carbon nanotubes are added when preparing the positive and negative electrode slurries to ensure the flow rate of ions, strengthen the distance between the active material and the current collector, and enable the active materials of the positive and negative electrode groups to be deposited thicker.

[0034] T3. Fabrication of positive and negative electrode cover assemblies: According to the gram capacity of the active material, the positive electrode slurry and the negative electrode slurry are directly injected into the upper and lower cover cavities respectively. Following the design principles of lithium-ion batteries, the gram capacity of the active material is determined by injecting slurry at a rate of more than 3% of the negative electrode > the positive electrode, and the positive and negative electrode cover assemblies are respectively fabricated.

[0035] T4. Filling: Place the positive electrode cap assembly and the negative electrode cap assembly on an ultrasonic vibrator for filling and vibration to remove bubbles and ensure that the interior is fully filled.

[0036] T5. Drying process: Place the positive electrode cap assembly and the negative electrode cap assembly into a vacuum oven and bake at 100-250°C for 1-24 hours to thoroughly dry the active ingredients and allow the functional groups of the binder colloid to undergo secondary recombination, thereby increasing the softness of the colloid and preventing the powder from falling off.

[0037] T6. Pressing: Place the baked positive electrode cap assembly and negative electrode cap assembly into a hydraulic press to squeeze the material in the cap cavity to reach the designed thickness.

[0038] T7. Soaking: Soak the positive electrode cover assembly and the negative electrode cover assembly in a sealed and dry space filled with electrolyte at an ambient temperature of 45-50° C. for 24 hours.

[0039] T8. Diaphragm processing: Use a mold to cut the diaphragm into a circular diaphragm with a size of the upper cover outer diameter + 1mm, and soak it in a closed and dry space for 10 minutes to allow the diaphragm to absorb the electrolyte to reach saturation.

[0040] T9, Molding: Assemble the positive electrode cap group, negative electrode cap group and diaphragm in a closed and dry space, and use an ultrasonic welder to weld them into shape.

[0041] Preferably, in step T1, the upper cover and the lower cover are manufactured by:

[0042] T11. Use punching equipment to cut the metal sheet into the required size;

[0043] T12. Place the cut metal sheet in the injection mold, open the injection mold, and allow the molten plastic to enter and combine with the metal sheet to form the upper cover and the lower cover;

[0044] T13. Use grinding equipment to grind one side of the metal sheet to form a rough surface.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] In the present invention, the conventional battery production process of using copper foil and aluminum foil as current collectors and coating positive and negative active materials is abandoned. By directly using the metal shell bottom as the current collector, the positive and negative active materials are injected into the shell, and the cumbersome process of making a core by winding or stacking the diaphragm and the positive and negative electrode sheets is abandoned. The positive and negative electrode cover groups and the diaphragm are assembled and stamped or ultrasonically welded into shape. The secondary baking of the conventional electrode group is abandoned, and one-time molding is adopted, which greatly reduces costs and improves production efficiency. At the same time, the all-electric button battery produced by this method maximizes the use of the internal space of the battery, making it an effective energy space and increasing the battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for manufacturing a fully electric button battery according to the present invention;

[0048] Figure 2 A structural diagram of a button battery made of all metal in a method for making a fully electric button battery according to the present invention;

[0049] Figure 3 This is a structural diagram of a button battery made of metal and plastic in a method for making a fully electric button battery of the present invention. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] Example

[0052] Reference Figure 1-3 A method for manufacturing a fully electric button cell battery comprises the following steps:

[0053] First, the shell is made of all metal or metal plus plastic;

[0054] When choosing all-metal button batteries, the following steps are specifically included:

[0055] Ⅰ. Shell production: First, use a stamping and cutting device to cut the metal plate into the required size, then use a stamping device to punch the cut metal plate into the upper cover and lower cover, and then use a grinding device to grind the bottom of the upper cover and lower cover to form a rough surface. The metal at the bottom of the upper cover and lower cover is used as the current collector;

[0056] II. Preparation of positive and negative electrode slurries: 0.5-5% carbon nanotubes are added to the positive and negative electrode slurries to ensure the ion flow rate, strengthen the distance between the active material and the current collector, and enable the active materials of the positive and negative electrode groups to be deposited thicker;

[0057] III. Fabrication of positive and negative electrode cover assemblies: According to the gram capacity of the active material, the positive electrode slurry and the negative electrode slurry are directly injected into the upper and lower cover cavities respectively. Following the design principles of lithium-ion batteries, the gram capacity of the active material is such that the negative electrode is greater than the positive electrode by more than 3% of the slurry amount injected, and the positive electrode cover assembly and the negative electrode cover assembly are respectively fabricated;

[0058] IV. Filling: Place the positive electrode cap assembly and the negative electrode cap assembly on an ultrasonic vibrator for filling and vibration to remove bubbles and ensure that the interior is fully filled;

[0059] V. Drying process: Place the positive electrode cap assembly and the negative electrode cap assembly into a vacuum oven at a temperature of 100-250°C for 1-24 hours to thoroughly dry the active ingredients and allow the functional groups of the binder colloid to undergo secondary recombination, thus increasing the softness of the colloid and preventing the powder from falling off.

[0060] VI. Pressing: Place the baked positive electrode cap assembly and negative electrode cap assembly into a hydraulic press to squeeze the material in the cap cavity to reach the designed thickness;

[0061] VII. Soaking: Soak the positive electrode cap assembly and the negative electrode cap assembly in a sealed and dry space filled with electrolyte at a temperature of 45-50°C for 24 hours;

[0062] VIII. Diaphragm processing: Use a mold to cut the diaphragm into a circular diaphragm with a size of the outer diameter of the upper cover + 1mm, and soak it in a closed and dry space for 10 minutes to allow the diaphragm to absorb the electrolyte to reach saturation;

[0063] IX. Molding: Assemble the positive electrode cover assembly, negative electrode cover assembly, sealing ring, and diaphragm in a closed and dry space, and use a punching machine to stamp so that the upper cover and the lower cover are sealed and pressed to form a fully electric button battery.

[0064] When metal and plastic are used to make button batteries, the following steps are specifically included:

[0065] ①. Shell production: First, use a punching device to cut the metal sheet into the required size, then place the cut metal sheet in the injection mold, open the injection mold, and let the molten plastic enter and combine with the metal sheet to form the upper cover and the lower cover. Then use a grinding device to grind one side of the metal sheet to form a rough surface. The metal sheet at the bottom of the cover is used as the current collector;

[0066] ②. Preparation of positive and negative electrode slurries: 0.5-5% carbon nanotubes are added when preparing positive and negative electrode slurries to ensure the flow rate of ions, strengthen the distance between the active material and the current collector, and enable the active materials of the positive and negative electrode groups to be accumulated thicker.

[0067] ③. Production of positive and negative electrode cover groups: According to the gram capacity of the active material, the positive electrode slurry and the negative electrode slurry are directly injected into the upper and lower cover cavities respectively. In accordance with the design principles of lithium-ion batteries, the gram capacity of the active material is injected according to the negative electrode > positive electrode slurry amount of more than 3%, and the positive electrode cover group and negative electrode cover group are respectively produced.

[0068] ④. Filling: Place the positive electrode cap assembly and the negative electrode cap assembly on an ultrasonic vibrator for filling and vibration to remove bubbles and ensure that the interior is fully filled.

[0069] ⑤. Drying process: Place the positive electrode cover group and the negative electrode cover group into a vacuum oven and bake at 100-250℃ for 1-24 hours to thoroughly dry the active material and to allow the functional groups of the binder colloid to undergo secondary recombination, thereby increasing the softness of the colloid and preventing the powder from falling off easily.

[0070] ⑥. Pressing: Place the baked positive electrode cover assembly and negative electrode cover assembly into a hydraulic press and squeeze the material in the cover cavity to reach the designed thickness.

[0071] ⑦. Soaking: Soak the positive electrode cover assembly and the negative electrode cover assembly in a closed and dry space filled with electrolyte at an ambient temperature of 45-50°C for 24 hours.

[0072] ⑧. Diaphragm processing: Use a mold to cut the diaphragm into a circular diaphragm with a size of the outer diameter of the upper cover + 1mm, and soak it in a closed and dry space for 10 minutes to allow the diaphragm to absorb the electrolyte to reach saturation.

[0073] ⑨. Molding: Assemble the positive electrode cap group, negative electrode cap group, and separator in a closed and dry space, and use an ultrasonic welder to weld them into a fully electric button battery.

[0074] The present invention abandons the production process of using copper foil and aluminum foil as current collectors and coating positive and negative active materials in conventional batteries. By directly using the metal shell bottom as the current collector, the positive and negative active materials are injected into the shell, and the cumbersome process of making a core by winding or stacking the diaphragm and the positive and negative electrode sheets is abandoned. The positive and negative electrode cover groups and the diaphragm are assembled and stamped or ultrasonically welded into shape. The secondary baking of the conventional electrode group is abandoned, and one-time molding is adopted, which greatly reduces costs and improves production efficiency. At the same time, the all-electric button battery produced by this method maximizes the use of the internal space of the battery, making it an effective energy space and increasing the battery capacity.

[0075] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. 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 fully electric button battery, characterized in that: The following steps are involved: A1. Shell production: The shell is made of all metal or metal plus plastic; A2. Preparation of positive and negative electrode slurries; A3, production of positive and negative electrode cover assembly; A4, filling; A5. Drying processing; A6, pressing; A7, soak; A8, diaphragm processing; A9. Molding.

2. The method for manufacturing a fully electric button cell according to claim 1, wherein: In the step A1, when all-metal button batteries are used, the following steps are specifically included: S1. Shell production: Use metal materials to make the upper cover and lower cover, roughen the metal of the upper cover and lower cover, and use the metal of the upper cover and lower cover bottom as the current collector; S2. Preparation of positive and negative electrode slurries: 0.5-5% carbon nanotubes are added to the positive and negative electrode slurries to ensure the ion flow rate, increase the distance between the active material and the current collector, and enable the active materials of the positive and negative electrode groups to be deposited thicker; S3. Fabrication of positive and negative electrode cover assemblies: According to the gram capacity of the active material, the positive electrode slurry and the negative electrode slurry are directly injected into the upper and lower cover cavities respectively. Following the design principles of lithium-ion batteries, the gram capacity of the active material is such that the negative electrode is greater than the positive electrode by more than 3% of the slurry amount injected, and the positive electrode cover assembly and the negative electrode cover assembly are respectively fabricated; S4. Filling: Place the positive electrode cap assembly and the negative electrode cap assembly on an ultrasonic vibrator for filling and vibration to remove bubbles and ensure that the interior is fully filled; S5. Drying process: Place the positive electrode cap assembly and the negative electrode cap assembly into a vacuum oven and bake for 1-24 hours to thoroughly dry the active material and to allow the functional groups of the binder colloid to undergo secondary recombination, thereby increasing the softness of the colloid and preventing the powder from falling off. S6. Pressing: Place the baked positive electrode cap assembly and negative electrode cap assembly into a hydraulic press to squeeze the material in the cap cavity to reach the designed thickness; S7. Soaking: Soak the positive electrode cover assembly and the negative electrode cover assembly in a sealed and dry space filled with electrolyte for 24 hours; S8, diaphragm processing: Use a mold to cut the diaphragm into a circular diaphragm with a size of the outer diameter of the upper cover + 1mm, and soak it in a closed and dry space for 10 minutes to allow the diaphragm to absorb the electrolyte to reach saturation; S9, molding: Assemble the positive electrode cover assembly, negative electrode cover assembly, sealing ring, and diaphragm in a closed and dry space, and use a punching machine to punch so that the upper cover and the lower cover are sealed and pressed.

3. The method for manufacturing a fully electric button cell according to claim 1, wherein: In step S1, the upper cover and the lower cover are manufactured as follows: S11, using a punching and cutting device to cut the metal sheet into the required size; S12, using a stamping device to stamp the cut metal plate into an upper cover and a lower cover; S13. Use a grinding device to grind the bottom of the upper cover and the lower cover to form a rough surface.

4. The method for manufacturing a fully electric button cell according to claim 2, wherein: In step S5, the temperature of the vacuum oven is set to 100-250°C.

5. The method for manufacturing a fully electric button cell according to claim 4, wherein: In step S7, the temperature in the space is set to 45-50°C.

6. The method for manufacturing a fully electric button cell according to claim 1, wherein: In the step A1, when metal and plastic are used to make a button battery, the following steps are specifically included: T1. Shell production: Assemble the metal sheet and plastic ring to form the upper cover and lower cover. Roughen one side of the metal sheet. The metal sheet at the bottom of the cover is used as the current collector. T2. Preparation of positive and negative electrode slurries: 0.5-5% carbon nanotubes are added when preparing the positive and negative electrode slurries to ensure the flow rate of ions, strengthen the distance between the active material and the current collector, and enable the active materials of the positive and negative electrode groups to be deposited thicker. T3. Fabrication of positive and negative electrode cover assemblies: According to the gram capacity of the active material, the positive electrode slurry and the negative electrode slurry are directly injected into the upper and lower cover cavities respectively. Following the design principles of lithium-ion batteries, the gram capacity of the active material is determined by injecting slurry at a rate of more than 3% of the negative electrode > the positive electrode, and the positive and negative electrode cover assemblies are respectively fabricated. T4. Filling: Place the positive electrode cap assembly and the negative electrode cap assembly on an ultrasonic vibrator for filling and vibration to remove bubbles and ensure that the interior is fully filled. T5. Drying process: Place the positive electrode cap assembly and the negative electrode cap assembly into a vacuum oven and bake at 100-250°C for 1-24 hours to thoroughly dry the active ingredients and allow the functional groups of the binder colloid to undergo secondary recombination, thereby increasing the softness of the colloid and preventing the powder from falling off. T6. Pressing: Place the baked positive electrode cap assembly and negative electrode cap assembly into a hydraulic press to squeeze the material in the cap cavity to reach the designed thickness. T7. Soaking: Soak the positive electrode cover assembly and the negative electrode cover assembly in a sealed and dry space filled with electrolyte at an ambient temperature of 45-50° C. for 24 hours. T8. Diaphragm processing: Use a mold to cut the diaphragm into a circular diaphragm with a size of the upper cover outer diameter + 1mm, and soak it in a closed and dry space for 10 minutes to allow the diaphragm to absorb the electrolyte to reach saturation. T9, Molding: Assemble the positive electrode cap group, negative electrode cap group and diaphragm in a closed and dry space, and use an ultrasonic welder to weld them into shape.

7. The method for manufacturing a fully electric button cell according to claim 1, wherein: In step T1, the upper cover and the lower cover are manufactured as follows: T11. Use punching equipment to cut the metal sheet into the required size; T12. Place the cut metal sheet in the injection mold, open the injection mold, and allow the molten plastic to enter and combine with the metal sheet to form the upper cover and the lower cover; T13. Use grinding equipment to grind one side of the metal sheet to form a rough surface.

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