Manufacturing method of cylindrical nickel-metal hydride battery with ultra-wide temperature range and long service life

Abstract

The invention relates to the technical field of nickel-metal hydride battery manufacturing, in particular to a manufacturing method of a cylindrical ultra-wide-temperature long-service-life nickel-metal hydride battery, which comprises the following steps: 1) negative electrode preparation: preparing negative electrode slurry by adopting A2B7 type alloy powder as a main component through a wet process, the negative electrode slurry comprises 80-90% of hydrogen storage alloy powder, 2-8% of an additive, 6-15% of a binder and a certain amount of water, the materials with a copper net or a steel strip as a base body are filled with the mixture after being evenly stirred, and the negative electrode piece is obtained after drying and cutting. And the battery is placed in an extreme environment with the temperature of 85 DEG C and the humidity of 85% for 1000 hours, so that the stability and durability of the battery under high-temperature and high-humidity conditions can be comprehensively evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of nickel-metal hydride battery manufacturing, and specifically to a manufacturing method for a cylindrical nickel-metal hydride battery with ultra-wide temperature range and long service life. Background Art

[0002] With the increasing global awareness of environmental protection and the promotion of the sustainable development strategy, new energy technologies have made great progress in recent years. Among them, nickel-metal hydride batteries, as an important secondary battery, have been widely used in many fields due to their unique advantages. Nickel-metal hydride batteries have a high energy density, which means that they can store more electrical energy under the same volume or weight, thus providing a longer usage time. In addition, nickel-metal hydride batteries also have good environmental friendliness, as they do not contain toxic heavy metals such as lead and cadmium, and have relatively little impact on the environment. At the same time, nickel-metal hydride batteries also have a long cycle life and can withstand multiple charge and discharge cycles without significant loss of performance, which reduces the frequency and cost of battery replacement. In the energy storage field, nickel-metal hydride batteries are used to store electrical energy generated by renewable energy sources such as solar energy and wind energy, and release it when needed to achieve a stable supply of energy.

[0003] However, despite the many advantages of nickel-metal hydride batteries, their performance is poor in extreme temperature environments. In low-temperature environments, such as below -40°C, the electrolyte of nickel-metal hydride batteries becomes viscous, resulting in a decrease in ionic conductivity, thus affecting the charge and discharge performance of the battery. In high-temperature environments, such as above 85°C, the chemical reactions inside the battery accelerate, leading to safety problems such as overheating, gas swelling, and even explosion of the battery. These performance limitations seriously hinder the application of nickel-metal hydride batteries in a wider range of scenarios, such as polar exploration and high-temperature industrial environments. Summary of the Invention

[0004] (I) Object of the Invention

[0005] In view of this, the object of the present invention is to provide a manufacturing method for a cylindrical nickel-metal hydride battery with ultra-wide temperature range and long service life, aiming to solve the problem of performance attenuation of traditional batteries in high-temperature and low-temperature environments, and at the same time extend the service life of the battery.

[0006] (II) Technical Solution

[0007] A manufacturing method for a cylindrical nickel-metal hydride battery with ultra-wide temperature range and long service life, the method comprising the following steps:

[0008] 1) Preparation of the negative electrode: Using A2B7-type alloy powder as the main component, preparing the negative electrode slurry through a wet process. The negative electrode slurry contains 80-90% of hydrogen storage alloy powder, 2-8% of additives, 6-15% of binder, and a certain amount of water. After stirring evenly, it is filled on a material with a copper mesh or steel strip as the substrate, and after drying and cutting, a negative electrode sheet is obtained;

[0009] 2) Preparation of the positive electrode: Using a dry process, the positive electrode powder contains 80%-95% nickel hydroxide, 5-10% additive composed of one or more of cobalt hydroxide, cobaltous oxide, titanium dioxide, ytterbium oxide, and 2-10% binder. After steps such as powder coating, roll pressing, slitting, spot welding the tab using a bipolar tab process, and pasting adhesive tape, the positive electrode sheet is obtained;

[0010] 3) Improvement of the cap performance: Reducing the influence of high and low temperatures on the explosion-proof ball to ensure the battery's sealing performance;

[0011] 4) Preparation of the electrolyte: The electrolyte is composed of 20-30% by weight of potassium hydroxide, 2-10% by weight of sodium hydroxide, 1-3% by weight of lithium hydroxide, and 60-70% by weight of deionized water. After mixing evenly and cooling to room temperature, it is used;

[0012] 5) Selection of the separator: Using a high-temperature imported sulfonated separator to improve the battery performance and ensure that the separator does not shrink at high temperatures to cause a short circuit;

[0013] 6) Assembly and encapsulation of the battery cell: The positive electrode sheet, negative electrode sheet, and separator are formed into a battery cell through processes such as winding. After injecting a certain amount of electrolyte, physical squat encapsulation is carried out to obtain the battery; among them, after the battery is placed in an environment with a temperature of 85°C and a humidity of 85% for 1000 hours, its capacity recovery rate is not less than 90% of the initial capacity.

[0014] Preferably, in the negative electrode preparation step, the A2B7 type alloy powder is used to improve the battery's discharge efficiency at extreme temperatures.

[0015] Preferably, in the positive electrode preparation step, the bipolar tab process is used to reduce the battery's internal resistance and improve the charge and discharge performance.

[0016] Preferably, in the cap performance improvement step, a special explosion-proof ball structure is used to reduce the influence of high and low temperature environments on the explosion-proof ball performance, thereby improving the battery's airtightness.

[0017] Preferably, the high-temperature imported sulfonated separator used has excellent heat resistance and chemical stability, and can effectively prevent the battery from short-circuiting at high temperatures.

[0018] From the above technical solutions, it can be seen that this application has the following beneficial effects:

[0019] 1. By testing the initial internal resistance and voltage after charging at 0.1C for 960 minutes and placing the battery in an extreme environment with a temperature of 85°C and a humidity of 85% for 1000 hours, the invention can comprehensively evaluate the stability and durability of the battery under high temperature and high humidity conditions.

[0020] 2. The invention stores the battery at different temperature points (25°C, 0°C, -20°C, -30°C, -40°C, 45°C, 60°C, 85°C) for 4 hours in sequence, and conducts charge and discharge tests at these temperatures, which can comprehensively evaluate the performance of the battery in different temperature environments.

[0021] 3. Through the IEC life test, the invention can ensure the long-term reliability and stability of the battery in practical applications, and reduce equipment failures or maintenance costs caused by battery performance degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the battery of the present invention.

[0023] In the figure: 1. Sealing ring; 2. Steel shell; 3. Cap; 4. Explosion-proof ball; 5. Negative electrode; 6. Diaphragm; 7. Positive electrode; 8. Electrolyte. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following description is essentially exemplary only and is not intended to limit the present disclosure, application, and uses. It should be understood that in all these drawings, the same or similar reference numerals indicate the same or similar parts and features. Each drawing only schematically shows the concept and principle of the embodiments of the present disclosure, and does not necessarily show the specific dimensions and their ratios of the embodiments of the present disclosure. In a specific part of a specific drawing, the relevant details or structures of the embodiments of the present disclosure may be illustrated in an exaggerated manner.

[0025] Please refer to Figure 1 , an embodiment provided by the present invention:

[0026] A manufacturing method of a cylindrical ultra-wide temperature and long-life nickel-metal hydride battery, the method comprising the following steps:

[0027] As Figure 1 shown: The nickel-metal hydride battery includes a sealing ring 1, a steel shell 2, a cap 3, an explosion-proof ball 4, a negative electrode 5, a diaphragm 6, a positive electrode 7, and an electrolyte 8.

[0028] 1) Preparation of the negative electrode 5: Using A2B7 type alloy powder as the main component, preparing the negative electrode 5 slurry through a wet process. The negative electrode 5 slurry contains 80-90% of hydrogen storage alloy powder, 2-8% of additives, 6-15% of binder, and a certain amount of water. After stirring evenly, it is filled on a material with a copper mesh or steel strip as the substrate, and after drying and cutting, the negative electrode 5 sheet is obtained.

[0029] 2) Preparation of the positive electrode 7: Using a dry process, the positive electrode 7 powder contains 80%-95% nickel hydroxide, 5-10% additives composed of one or more of cobalt hydroxide, cobaltous oxide, titanium dioxide, and ytterbium oxide, and 2-10% binder. After steps such as powder coating, roll pressing, slitting, spot welding the electrode tabs using a bipolar tab process, and pasting adhesive tape, the positive electrode 7 sheets are obtained;

[0030] 3) Performance improvement of the cap 3: Reduce the influence of high and low temperatures on the explosion-proof ball 4 to ensure the battery's sealing performance;

[0031] 4) Preparation of the electrolyte 8: The electrolyte 8 is composed of 20-30% by weight of potassium hydroxide, 2-10% by weight of sodium hydroxide, 1-3% by weight of lithium hydroxide, and 60-70% by weight of deionized water. After mixing evenly and cooling to room temperature, it is used;

[0032] 5) Selection of the separator 6: Use a high-temperature imported sulfonated separator 6 to improve the battery performance and ensure that the separator 6 does not shrink at high temperatures to cause a short circuit;

[0033] 6) Cell assembly and encapsulation: The positive electrode 7 sheets, negative electrode 5 sheets, and separator 6 are formed into a cell through processes such as winding. After injecting a certain amount of electrolyte 8, physical squat encapsulation is performed to obtain the battery; among them, after the battery is placed in an environment with a temperature of 85°C and a humidity of 85% for 1000 hours, its capacity recovery rate is not less than 90% of the initial capacity.

[0034] The battery is stored at temperatures of 25°C, 0°C, -20°C, -30°C, -40°C, 45°C, 60°C, and 85°C for 4 hours in sequence, and charge and discharge are performed at this temperature. The discharge efficiency is as follows in the table:

[0035]

[0036]

[0037] Furthermore, in the preparation steps of the negative electrode 5, the A2B7 type alloy powder is used to improve the battery's discharge efficiency at extreme temperatures to ensure that after the battery is placed in an environment with a temperature of 85°C and a humidity of 85% for 1000H, the capacity recovery ≥ 90% of the initial capacity.

[0038] Furthermore, in the preparation steps of the positive electrode 7, the bipolar tab process is used to reduce the battery's internal resistance, improve the charge and discharge performance, and enhance the overall efficiency and user experience of the battery.

[0039] Furthermore, in the performance improvement steps of the cap 3, a special explosion-proof ball 4 structure is used to reduce the influence of high and low temperature environments on the performance of the explosion-proof ball 4, thereby improving the battery's airtightness and enhancing the safety and reliability of the battery.

[0040] Furthermore, the high-temperature imported sulfonated separator 6 adopted has excellent heat resistance and chemical stability, which can effectively prevent the battery from short-circuiting at high temperatures and extend the service life of the battery.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

Claims

1. A method for manufacturing a cylindrical ultra-wide temperature and long life nickel-hydrogen battery, characterized in that: The method comprises the following steps: 1) Preparation of negative electrode (5): A2B7 alloy powder is used as the main component to prepare negative electrode (5) slurry by a wet process, wherein the negative electrode (5) slurry comprises 80-90% of hydrogen storage alloy powder, 2-8% of additives, 6-15% of binder and a certain amount of water, and the slurry is stirred evenly and filled on a material with a copper mesh or a steel strip as a base, and then dried and cut to obtain a negative electrode (5) sheet; 2) Preparation of positive electrode (7): using a dry process, the positive electrode (7) powder contains 80%-95% nickel hydroxide, 5-10% of an additive consisting of one or more of cobalt hydroxide, cobaltous oxide, titanium dioxide, and ytterbium oxide, and 2-10% of a binder, and the positive electrode (7) sheet is obtained after the steps of powder coating, rolling, cutting, spot welding of the pole ears using a double-ear ear process, and pasting adhesive tape; 3) Cap (3) performance improvement: reduce the impact of high and low temperatures on the explosion-proof ball (4) and ensure the sealing of the battery; 4) Preparation of electrolyte (8): The electrolyte (8) is composed of 20-30% by weight of potassium hydroxide, 2-10% by weight of sodium hydroxide, 1-3% by weight of lithium hydroxide and 60-70% by weight of deionized water, which are mixed evenly and cooled to room temperature before use; 5) Selection of diaphragm (6): Use high-temperature imported sulfonated diaphragm (6) to improve battery performance and ensure that the diaphragm (6) will not shrink at high temperatures and cause short circuits; 6) Cell assembly and packaging: The positive electrode (7) sheet, the negative electrode (5) sheet and the separator (6) are wound to form a cell, and a certain amount of electrolyte (8) is injected, and then physically sealed to obtain a battery; wherein the battery has a capacity recovery rate of not less than 90% of the initial capacity after being left in an environment with a temperature of 85° C. and a humidity of 85% for 1000 hours.

2. The method for manufacturing a cylindrical ultra-wide temperature and long life nickel-hydrogen battery according to claim 1 is characterized in that: In the negative electrode (5) preparation step, the A2B7 alloy powder is used to improve the discharge efficiency of the battery at extreme temperatures.

3. The method for manufacturing a cylindrical ultra-wide temperature and long life nickel-hydrogen battery according to claim 1 is characterized in that: In the step of preparing the positive electrode (7), a double-ear process is adopted to reduce the internal resistance of the battery and improve the charge and discharge performance.

4. The method for manufacturing a cylindrical ultra-wide temperature and long life nickel-hydrogen battery according to claim 1 is characterized in that: In the step of improving the performance of the cap (3), a special explosion-proof ball (4) structure is used to reduce the impact of high and low temperature environments on the performance of the explosion-proof ball (4), thereby improving the airtightness of the battery.

5. The method for manufacturing a cylindrical ultra-wide temperature and long life nickel-hydrogen battery according to claim 1 is characterized in that: The high-temperature imported sulfonated diaphragm (6) used has excellent heat resistance and chemical stability, and can effectively prevent the battery from short-circuiting at high temperatures.

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