KR102523085B1 - Method for manufacturing electrode plate for lead acid battery that improves ion mobility by applying porous polyester nonwoven fabric - Google Patents

Abstract

The present invention relates to a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric, and more particularly, by applying a porous PET fiber sheet to the electrode plate, the ion mobility is improved by forming micropores and improving the porosity. It relates to a method for manufacturing an electrode plate for a lead-acid battery that improves ion mobility by applying a porous polyester nonwoven fabric capable of improving charge/discharge efficiency and improving capacity and basic performance.

Description

Method for manufacturing electrode plate for lead acid battery that improves ion mobility by applying porous polyester nonwoven fabric}

The present invention relates to a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric, and more particularly, by applying a porous PET fiber sheet to the electrode plate, the ion mobility is improved by forming micropores and improving the porosity. It relates to a method for manufacturing an electrode plate for a lead-acid battery that improves ion mobility by applying a porous polyester nonwoven fabric capable of improving charge/discharge efficiency and improving capacity and basic performance.

Basically, the battery separator is an electronic insulator and an ionic conductor.

That is, the separator prevents direct electrical contact between electrodes of opposite polarity while enabling ionic current between the electrodes. In order to satisfy these two functions, the separator generally has pores as small as possible to prevent electronic short circuit caused by dendrites or plate particles, and the internal battery resistance It is a porous insulator with a porosity as high as possible to minimize

In lead-acid batteries, the separator also determines the proper electrode spacing, thereby regulating the amount of electrolyte that participates in the cell reaction.

The separator must be stable throughout the lifespan of the battery. (Refer to Korean Patent Laid-Open Publication No. 2001-0042790)

As is well known, the lead-acid battery used in automobiles is a secondary battery capable of charging and discharging. It uses dilute sulfuric acid (H2SO4) as an electrolyte and applies lead dioxide (PbO2) to the positive (+) electrode as an electrode active material. When spongy lead (Pb) is applied to the negative (-) pole and connected to an external circuit, electricity flows and discharges (a process in which the initial active material composition of the positive and negative electrodes is changed to lead sulfate (PbSO4)) and external current It uses the principle of charging (a process in which lead sulfate is changed into an initial positive electrode active material and negative electrode active material before discharging).

The structure of such a lead-acid battery is briefly presented in FIG.

There are various types of positive electrode plate 1 and negative electrode plate 2 coated with active materials depending on the manufacturing method.

It consists of a lattice-shaped substrate 5 and a paste-like active material applied thereon.

Usually, the substrate 5 is made of an alloy mainly composed of antimony (Sb) and calcium (Ca) to enhance mechanical strength and corrosion resistance, and the manufacturing method is cast by pouring into a mold by gravity or by continuous rolling. (Refer to Korean Patent Publication No. 2000-0031876)

The active material is a part that plays an important role in the performance of a lead-acid battery. Lead oxide (PbO) in a fine powder state is continuously coated with a dilute sulfuric acid aqueous solution and a paste form on the substrate in an applicator to age, dry, and electrically oxidize and reduce. Manufactured through the chemical process.

Lead dioxide (PbO2), a cathode active material, is composed of countless fine particles of oxidized lead, and is rich in porosity so that the electrolyte can freely diffuse and penetrate between the particles.

In addition, sponge lead, which is an active material of the negative electrode, is also highly porous and reactive, allowing the electrolyte to penetrate freely.

The positive and negative plates manufactured as described above are separated by a porous non-conductive separator (3) to prevent direct contact (short) of the two electrode plates, and are assembled into a product precursor (a container constituting the product).

The lead-acid battery produced in this way exhibits electrical performance by the internal electrolyte, and is charged and discharged in the vehicle.

The lead-acid battery installed in a vehicle affects the lifespan of the lead-acid battery depending on the driving conditions of the vehicle (daily average mileage, driver's driving habits, road conditions) and the electrical load condition of the vehicle's electronic parts.

However, harsh operating conditions and excessive electrical load reduce the bonding strength of the porous positive electrode active material (PbO2). It becomes a factor that reduces the life of the storage battery.

As described above, an electrode plate is manufactured in a state in which an active material having electrochemical activity is applied to a substrate on which an electrode is cast or expanded to reduce dropout of the active material of the electrode plate, and a nonwoven fabric made of a thermoplastic resin is pressed to a certain depth on the surface of the active material. In a lead-acid battery composed of a plurality of electrode plates with an active material layer attached to the surface, a thin fiber mesh is covered on the outer surface of the active material layer, and a known separator formed of a polyethylene-based polymer material and having protrusions formed on the inner surface of the fiber mesh A method of reducing the size of the lead-acid battery by installing it on the outer surface can reduce the dropout of the active material, suppress the growth of dendrites, and reduce the thickness of the separator.

The use of the non-woven fabric and fiber mesh is widely used in batteries according to their characteristics, and in the balance of battery life and discharge performance of a separator (separator) made of microporous film and non-woven fabric in a nickel-zinc secondary battery In order to regulate the optimal amount of electrolyte, the utilization rate of the zinc anode is increased to prolong the life of the battery. The Ni anode wrapped with polypropylene nonwoven fabric and the Zn anode wrapped with cotton nonwoven fabric and polypropylene nonwoven fabric are wrapped with polypropylene microporous film. A polypropylene nonwoven fabric is formed to separate between the Ni anode and the Zn cathode in a battery and an alkali zinc storage battery that adjusts the ratio of the amount of electrolyte moistened in the separator and the total amount of electrolyte in the battery, and the Ni anode, Zn anode and polypropylene nonwoven fabric In an alkali zinc storage battery in which a multilayer separator having a plurality of layers of microporous membrane is disposed on the outside of an alkali zinc storage battery and a lithium ion battery, characterized in that a cotton nonwoven fabric is formed between the Zn negative electrode of the multilayer separator and the polypropylene nonwoven fabric Polymers in batteries, such as separators made from blends of polyolefin copolymers and oligomers of polyolefin polymers, comprising microporous polyolefin membranes having a porosity in the range of 30-80% and an average pore size in the range of 002-20 microns in the manufacture of separators. Polyolefin-based nonwoven fabrics and membranes composed of have been widely used.

Most of the separators currently used in lead-acid batteries are rechargeable porous polyethylene separators, the main purpose of which is to prevent direct contact between the positive and negative plates, thereby preventing short circuits, and the secondary purpose is to provide a small resistance between the positive and negative plates for ionization. It is necessary to allow current flow.

To summarize, in general, after applying the active material to the grid for lead-acid batteries, tissue paper is attached to the surface of the active material.

Tissue Paper is easily torn during application, resulting in poor workability and the power to fix the electrode plate is weak. resulting in reduced starting power or premature end of life.

In addition, the tissue paper melts after the formation process to have the electrical properties of the battery, and becomes a floating substance in the form of solids of electrolyte and “floats”.

These ingredients serve to increase resistance.

To make up for this shortcoming, instead of tissue paper, non-woven fabric made of 　polyethylene terephthalate is used by pressing it on the surface of the active material.

This is used to support the active material applied to the grid so that it does not fall off the grid, and this active material support (non-woven fabric) is characterized by acid resistance, heat resistance, and oxidation resistance.

However, the nonwoven fabric that serves as a support has the disadvantage of being the main cause of deterioration in battery performance by increasing the resistance in the product by becoming a polymer that hinders the movement of ions and electrons between the anode and cathode after the formation process of adding electrolyte and blowing electricity. I had.

On the other hand, in general, in a lead-acid battery, after applying the active material to the grid, a non-woven fabric made of polyethylene terephthalate is pressed and attached to the surface of the active material.

This is used only to support the active material applied to the grid so that it does not fall off the grid, and this active material support (non-woven fabric) is characterized by acid resistance, heat resistance, and oxidation resistance.

However, since this support only serves as a support to prevent the active material from falling off by pressing when the active material is applied to the grid, it becomes a polymer that hinders the movement of ion electrons between the anode and cathode after the chemical process of adding electrolyte and blowing electricity. , it had the disadvantage of reducing the ion mobility and resistance in the product, which is the main cause of the decline in basic performance.

Therefore, in the present invention, in order to improve ion mobility, when manufacturing a PET (polyethylene terephthalate) nonwoven fabric, which is an active material support for an electrode plate, after adding SiO2 as a filler, the fabricated nonwoven fabric is HF etched to corrode SiO2 to form Si, The porosity and micropores were improved using the volume reduction that occurred, and through this, a method for activating the movement between ions was proposed.

Korean Patent Publication No. 2001-0042790 Korean Patent Publication No. 2000-0031876

Therefore, the present invention has been made to solve the above conventional problems,

By applying the porous PET fiber sheet to the electrode plate, the ion mobility is improved due to the formation of micropores and the improvement of the porosity, thereby improving charging and discharging efficiency, and improving capacity and basic performance.

In order to achieve the problem to be solved by the present invention, a method for manufacturing a lead-acid battery electrode plate for improving ion mobility by applying a porous polyester nonwoven fabric according to an embodiment of the present invention,

SiO 2 mixture preparation step (S100) of preparing a mixture by mixing PET resin and SiO 2; and

A mixture melting step (S200) of melting the mixture by setting the spinning temperature of the continuous extruder to 300 ° C; and

A cooling step (S300) for solidifying the continuous filament discharged from the capillaries of the continuous extruder with cooling wind at 25 ° C using a cooler; and

A fiber manufacturing step (S400) of preparing a fiber having an average fineness of 25um by stretching the spinning speed to 4,500 m/min using an air stretching machine; and

A lamination step (S500) of laminating the stretched fibers in a web form on a continuously moving metal net;

A SiO 2 fiber sheet manufacturing step (S600) of preparing a fiber sheet containing SiO 2 having a weight per unit area of 20 g/m 2 by thermally bonding the laminated fibers at a temperature of 240° C.;

An etching step (S700) of dipping the fiber sheet containing SiO2 into a mixed solution of 49% HF and EtOH at a mass ratio of 1:1 for 60 seconds to etch and convert it into Si;

A porous PET fiber sheet manufacturing step (S800) of washing the etched SiO2-containing fiber sheet with distilled water and drying it using N2 gas to prepare a porous PET fiber sheet;

An active material application step (S900) of applying the active material to the electrode plate; and

An electrode plate completion step (S1000) for manufacturing an electrode plate by placing the porous PET fiber sheet on the electrode plate coated with the active material and drying it at a high temperature in a dryer (S1000); a task for improving durability and performance of a lead-acid battery will solve

Through the method of manufacturing an electrode plate for a lead-acid battery in which the porous polyester nonwoven fabric of the present invention is applied to improve ion mobility, by applying a porous PET fiber sheet to the electrode plate, the ion mobility is improved due to the formation of micropores and the improvement of the porosity during charging and discharging. Efficiency is improved, and capacity and basic performance can be improved.

That is, when manufacturing a PET (polyethylene terephthalate) nonwoven fabric, which is an active material support for electrode plates, to improve ion mobility, after adding SiO2 as a filler, HF etching the fabricated nonwoven fabric to corrode SiO2 to form Si, resulting in volume The porosity and micropores were improved using the reduction, which provides an effect of activating the movement between ions.

1 is a cross-sectional view schematically illustrating the internal structure of a typical lead-acid battery.
2 is a cross-sectional view of a portion of an electrode constituting a typical lead-acid battery.
3 is a process chart of a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to an embodiment of the present invention.
4 is an exemplary view of a SiO2-added nonwoven fabric manufactured by a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to an embodiment of the present invention.
5 is an exemplary view of a PET nonwoven fabric made of Si through etching treatment in a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to an embodiment of the present invention.
6 is an exemplary view of an electrode plate including a general nonwoven fabric.
7 is a graph comparing an improved product manufactured by a method for manufacturing an electrode plate for a lead acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to an embodiment of the present invention and a conventional product manufactured through a general manufacturing method, This is a graph showing lifespan verified in a high-temperature environment according to the standards of the American Association of Automotive Engineers.

A method for manufacturing an electrode plate for a lead-acid battery to improve ion mobility by applying a porous polyester nonwoven fabric according to an embodiment of the present invention,

SiO 2 mixture preparation step (S100) of preparing a mixture by mixing PET resin and SiO 2; and

A mixture melting step (S200) of melting the mixture by setting the spinning temperature of the continuous extruder to 300 ° C; and

A cooling step (S300) for solidifying the continuous filament discharged from the capillaries of the continuous extruder with cooling wind at 25 ° C using a cooler; and

A fiber manufacturing step (S400) of preparing a fiber having an average fineness of 25um by stretching the spinning speed to 4,500 m/min using an air stretching machine; and

A lamination step (S500) of laminating the stretched fibers in a web form on a continuously moving metal net;

A SiO 2 fiber sheet manufacturing step (S600) of preparing a fiber sheet containing SiO 2 having a weight per unit area of 20 g/m ² by thermally bonding the laminated fibers at a temperature of 240° C.; and

An etching step (S700) of dipping the fiber sheet containing SiO2 into a mixed solution of 49% HF and EtOH at a mass ratio of 1:1 for 60 seconds to etch and convert it into Si;

A porous PET fiber sheet manufacturing step (S800) of washing the etched SiO2-containing fiber sheet with distilled water and drying it using N ₂ gas to prepare a porous PET fiber sheet;

An active material application step (S900) of applying the active material to the electrode plate; and

and an electrode plate completion step (S1000) for manufacturing an electrode plate by placing the porous PET fiber sheet on the electrode plate coated with the active material and drying it at a high temperature in a dryer.

At this time, the etching step (S700),

It is characterized in that the movement between ions is activated by improving the porosity and micropores using the volume reduction generated by etching the SiO2-containing fiber sheet to Si.

At this time, by applying the porous PET fiber sheet to the electrode plate, the ion mobility is improved due to the formation of micropores and the improvement of the porosity, thereby improving charging and discharging efficiency, and improving capacity and basic performance.

At this time, the continuous extruder,

After stretching, it is characterized in that the discharge amount and the number of capillaries of the spinneret are adjusted so that the average fineness of the manufactured fiber is 25 μm.

On the other hand, by a method for manufacturing electrode plates for lead-acid batteries in which the porous polyester nonwoven fabric is applied to improve ion mobility,

If the capacity of the manufactured lead-acid battery is 80Ah ~ 87Ah,

The life span is from 1,920 cycles to 2,900 to 2,920 cycles, and it is characterized in that durability can be improved in the range of 51 to 52%.

At this time, produced by the production method of the present invention,

By providing a lead-acid battery electrode plate containing a porous polyester nonwoven fabric, when manufacturing a PET (polyethylene terephthalate) nonwoven fabric, which is an active material support for the electrode plate, in order to improve ion mobility, after adding SiO2 as a filler, the fabricated nonwoven fabric is HF The porosity and micropores were improved using the volume reduction generated by etching SiO2 to form Si, which provides an effect of activating movement between ions.

Hereinafter, a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to the present invention will be described in detail through an embodiment.

3 is a process chart of a method for manufacturing an electrode plate for a lead-acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to an embodiment of the present invention.

As shown in FIG. 3, the method for manufacturing an electrode plate for a lead-acid battery to improve ion mobility by applying the porous polyester nonwoven fabric of the present invention,

SiO 2 mixture preparation step (S100) of preparing a mixture by mixing PET resin and SiO 2; and

A mixture melting step (S200) of melting the mixture by setting the spinning temperature of the continuous extruder to 300 ° C; and

A cooling step (S300) for solidifying the continuous filament discharged from the capillaries of the continuous extruder with cooling wind at 25 ° C using a cooler; and

A fiber manufacturing step (S400) of preparing a fiber having an average fineness of 25um by stretching the spinning speed to 4,500 m/min using an air stretching machine; and

A lamination step (S500) of laminating the stretched fibers in a web form on a continuously moving metal net;

A SiO 2 fiber sheet manufacturing step (S600) of preparing a fiber sheet containing SiO 2 having a weight per unit area of 20 g/m ² by thermally bonding the laminated fibers at a temperature of 240° C.; and

An etching step (S700) of dipping the fiber sheet containing SiO2 into a mixed solution of 49% HF and EtOH at a mass ratio of 1:1 for 60 seconds to etch and convert it into Si;

A porous PET fiber sheet manufacturing step (S800) of washing the etched SiO2-containing fiber sheet with distilled water and drying it using N ₂ gas to prepare a porous PET fiber sheet;

An active material application step (S900) of applying the active material to the electrode plate; and

and an electrode plate completion step (S1000) for manufacturing an electrode plate by placing the porous PET fiber sheet on the electrode plate coated with the active material and drying it at a high temperature in a dryer.

In the present invention, by applying a porous PET fiber sheet to the electrode plate, ion mobility is improved due to the formation of micropores and the improvement of the porosity, thereby improving charging and discharging efficiency, and providing an effect of improving capacity and basic performance.

Next, the manufacturing steps will be described in detail.

The SiO 2 mixture preparation step (S100) is a process of preparing a mixture by mixing PET resin and SiO 2 .

Preferably, a polyethylene terephthalate (PET) resin as a raw material was used, and a mixture was prepared by mixing the PET resin with SiO2 as a filler in a ratio of 99:1.

The PET resin is a staple fiber nonwoven fabric, which is sometimes made of a single material of synthetic resin, or a combination of two or more types of synthetic resin staple fibers.

Filament nonwoven fabrics mainly use polyethylene (PE), polypropylene (PP), and polyester (PET) fibers as single materials.

In forming non-woven fabrics, short fiber non-woven fabrics are chemically bonded using adhesives, thermal bonding using heat or fiber properties, needle punching, and melt blown. , stitch bonding method, etc. are used, and for filament nonwoven fabric, melt-spun yarn is piled up uniformly on a conveyor to form a sheet, and a heater embossing roller is passed through it. The spunbond method for making nonwoven fabric is mainly used.

The process of manufacturing the separator is specifically disclosed in Korean Registered Patent No. 10-0645970, filed and registered by the present applicant. Briefly, the registered patent is briefly described in forming the separator by attaching a nonwoven fabric to a substrate. , As shown in FIG. 3 of the registered patent, the plate body 6 is wound on the separator roll 7 attached to the enveloping machine, and the nonwoven fabric roll 8 additionally installed The plate body 6 and the nonwoven fabric 9 are bonded together while the plate body 6 and the nonwoven fabric 9 are unwound together by winding the nonwoven fabric 9 to form a separator member.

In manufacturing the separator member by the bonding device shown in FIG. 3, the plate body 6 having a plurality of ribs 62, and the ribs 62 as shown in FIG. Heat-resistant/chemical-resistant hot melt is applied and non-woven fabric is laminated and attached to it, or the plate body 6 and the non-woven fabric 9 are separated by ultrasonic welding as shown in FIG. It can be attached by forming junctions 10 at both ends of the plate.

Thereafter, a process of melting the mixture is performed by setting the spinning temperature of the continuous extruder to 300° C. through the melting the mixture step (S200).

Thereafter, the continuous filaments discharged from the capillaries of the continuous extruder through the cooling step (S300) are solidified with cooling wind at 25°C using a cooler.

Thereafter, in the fiber manufacturing step (S400), fibers having an average fineness of 25 μm are prepared by stretching the fibers at a spinning speed of 4,500 m/min using an air stretching machine.

Therefore, the continuous extruder,

After stretching, it is characterized in that the discharge amount and the number of capillaries of the spinneret are adjusted so that the average fineness of the manufactured fiber is 25 μm.

Thereafter, through the lamination step (S500), the stretched fibers are laminated in a web form on a continuously moving metal net.

Thereafter, through the SiO 2 fiber sheet manufacturing step (S600), the laminated fibers are thermally bonded at a temperature of 240° C. to manufacture a fiber sheet containing SiO 2 having a weight per unit area of 20 g/m ² .

The fiber sheet containing SiO 2 manufactured through the above-described SiO 2 fiber sheet manufacturing step (S600) has an external appearance as shown in FIG. 4.

Thereafter, through the etching step (S700), the fiber sheet containing SiO 2 is etched by dipping in a mixed solution of 49% HF and EtOH in a 1:1 mass ratio for 60 seconds to be etched.

As described above, as shown in FIG. 5, before the etching process, it has a fiber sheet shape containing SiO 2 , but after the etching process, it is converted to Si, and thus the volume is reduced.

Therefore, as shown in FIG. 5, by improving the porosity and micropores, it is possible to activate movement between ions.

Thereafter, in the fiber sheet manufacturing step (S800), the etched SiO2-containing fiber sheet is washed with distilled water and dried using N2 gas to prepare a porous PET fiber sheet.

That is, it is possible to manufacture a porous PET fiber sheet as shown in FIG. 5.

Thereafter, a process of applying the active material to the electrode plate is performed through the active material application step (S900).

Thereafter, the electrode plate completion step (S1000) is a process for manufacturing an electrode plate by placing the porous PET fiber sheet on the electrode plate coated with the active material, putting it into a dryer, and drying it at a high temperature.

That is, a high-performance electrode plate is manufactured through a natural drying process of the electrode plate of the present invention as shown in FIG. 6 for about 24 hours.

As described above, in order to understand the effect of the present invention, basic performance and life tests were conducted on lead-acid batteries using general electrode plates and lead-acid batteries using electrode plates including porous PET fiber sheets of the present invention. A product having a final capacity of 80Ah was manufactured through processes such as and the like, and a lifespan test was conducted according to the SAE J240 standard to verify the lifespan at high temperatures.

The conventional product described later refers to a lead-acid battery using a general electrode plate manufactured by the applicant, and an improved product refers to a lead-acid battery using an electrode plate including a porous PET fiber sheet.

As a result of the test, the capacity and life of 87Ah in the holding capacity were terminated at 2,920 cycles, which was improved by 35% in the holding capacity and 52% in the life compared to the conventional product.

The experimental data for this will be described later.

7 is a graph comparing an improved product manufactured by a method for manufacturing an electrode plate for a lead acid battery in which ion mobility is improved by applying a porous polyester nonwoven fabric according to an embodiment of the present invention and a conventional product manufactured through a general manufacturing method, This is a graph showing lifespan verified in a high-temperature environment according to the standards of the American Association of Automotive Engineers.

The test standard is a test method in which the EFB repeats charge/discharge at a high temperature (75° C.) to measure the cycle until the end of its lifespan.

(1 cycle: discharge at 25A for 4 minutes, charge at 14.8V [maximum 25A] constant voltage for 10 minutes)

This test is repeated 480 times for one week, and then, after standing for 56 hours, the state of the lead-acid battery is determined by discharging at a high rate of 630A and measuring the voltage at 30 seconds.

If the voltage at the time of 30 seconds is 7.2V or more, the lead-acid battery is judged to be intact and the above cycle is repeated.

<Test Example>

A conventional product described later refers to a lead-acid battery using a general electrode plate manufactured by the applicant, and an improved product refers to a lead-acid battery using an electrode plate including a porous PET fiber sheet.

division conventional products improvement RC 100min 135min CCA 622A 680A C20 82Ah 97Ah Durability (SAE J240) 1,920 Cycles 2,920 Cycles

Table 1 shows the performance test results of the conventional lead-acid battery and the lead-acid battery manufactured using the manufacturing method of the present invention. In the case of the conventional product, the durability showed 1,920 cycles, and in the case of the improved product, it showed 2,920 cycles. see Figure 7)

Therefore, it was confirmed through experiments that the durability was improved by 52% compared to the conventional products.

1) Reserve Capacity (RC)

Retained capacity RC measures the dischargeable duration until reaching the discharge end voltage of 10.5V with a discharge current of 25A at 25°C after being left for 1 hour or more after completion of full charge. It is a measure of how long the minimum function can be exercised to operate the load in a stopped state.

As a result of the test, as shown in Table 1, when manufactured including the electrode plate including the porous PET fiber sheet according to the present invention, the holding capacity (RC) was 126 to 140 minutes, to be precise, 135 minutes, compared to the existing conventional products. By showing a performance improvement effect of 35%, it was found that the lead-acid battery including the electrode plate including the porous PET fiber sheet had a positive effect on the storage capacity.

2) Cold Cranking Ampere (CCA)

In general, the rapid discharge characteristics of a storage battery rapidly deteriorate below -10 ° C, and the low-temperature starting current (CCA) is a high-rate discharge test to evaluate the vehicle's starting ability at low temperatures. Measure the voltage at the time of the first discharge.

In this test, a voltage of 7.2V or more is required for 30 seconds, and the higher the voltage, the better the performance.

In the present invention, the CCA was calculated using a correction formula of (30 second voltage ÷ 6-0.2) × 630.

As a result of the test, as shown in Table 1, the voltage for 30 seconds was 7.15V ~ 7.22V, the converted CCA was 670A ~ 685A, to be precise, 680A, showing a performance improvement effect of about 9% compared to the conventional product, porous PET It was found that the lead-acid battery including the electrode plate including the fiber sheet had a positive effect on the low-temperature starting current.

3) 20 hour rate capacity (AH)

This is to find out the low-rate discharge characteristics, and to measure the discharge capacity (AH) until the voltage reaches 10.5V by continuously discharging at 3.75A, which is a relatively small current for the lead-acid battery capacity.

As a result of the test, 92AH ~ 99AH, to be precise, 97AH, showed a performance improvement effect of about 18% compared to existing products, so that the lead-acid battery including the electrode plate including the porous PET fiber sheet had a positive effect on the 20 hour rate capacity (AH). It was found that the influence of

4) Life verification test (SAE J240, Cycle)

This is a graph (SAE J240) that verifies lifespan in a 75°C environment according to the standards of the American Society of Automotive Engineers. It is a test method to measure.

(1 cycle: discharge at 25A for 4 minutes, charge at 14.8V [maximum 25A] constant voltage for 10 minutes)

This test is repeated 480 times for one week, and then discharged at a high rate of 630A after standing for 56 hours to determine the state of the lead-acid battery by measuring the voltage at 30 seconds.

If the voltage at the time of 30 seconds is 7.2V or more, the lead-acid battery is judged to be intact and the above cycle is repeated.

As a result of the test, as shown in FIG. 4, it was found that the lead-acid battery including the electrode plate including the porous PET fiber sheet had a positive effect on the increase in lifespan by showing a 52% improvement in lifespan compared to the conventional product. .

5) Charge acceptance test (CA: Charge Acceptance test)

The fully charged sample is discharged for 2.5 hours at room temperature (25±2℃) with a 5-hour rate current (17.5A based on 70Ah), and then left at 0±2℃ for more than 12 hours.

Afterwards, charge with a constant voltage of 14.4V±0.1V and measure the current after 10 minutes of charging.

As a result of the test, it was found that the electric conductivity and charging efficiency of the improved product increased by about 47% in about 10 minutes compared to the conventional product.

division hour conventional products improvement




charging acceptance 1 min 27.25 29.87 2 minutes 24.21 28.92 3 minutes 22.14 28.22 4 minutes 21.25 27.52 5 minutes 20.11 27.21 6 minutes 19.35 26.84 7 minutes 18.74 26.16 8 minutes 17.68 25.69 9 minutes 17.04 24.97 10 minutes 16.43 24.28

Through the above manufacturing method, by applying the porous PET fiber sheet to the electrode plate, the ion mobility is improved due to the formation of micropores and the improvement of the porosity, so the efficiency during charging and discharging is improved, and the capacity and basic performance can be improved. will provide

Those skilled in the art to which the present invention pertains as described above will understand that it can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the embodiments described above are illustrative in all respects and should be understood as not being limiting.

S100: SiO2 mixture manufacturing step
S200: Mixture melting step
S300: Cooling step
S400: fiber manufacturing step
S500: lamination step
S600: SiO2 fiber sheet manufacturing step
S700: Etching step
S800: Porous PET fiber sheet manufacturing step
S900: Active material application step
S1000: pole plate completion stage

Claims (5)

In the method for manufacturing electrode plates for lead-acid batteries in which ion mobility is improved by applying a porous polyester nonwoven fabric,
SiO 2 mixture preparation step (S100) of preparing a mixture by mixing PET resin and SiO 2; and
A mixture melting step (S200) of melting the mixture by setting the spinning temperature of the continuous extruder to 300 ° C; and
A cooling step (S300) for solidifying the continuous filament discharged from the capillaries of the continuous extruder with cooling wind at 25 ° C using a cooler; and
A fiber manufacturing step (S400) of preparing a fiber having an average fineness of 25um by stretching the spinning speed to 4,500 m/min using an air stretching machine; and
A lamination step (S500) of laminating the stretched fibers in a web form on a continuously moving metal net;
A SiO 2 fiber sheet manufacturing step (S600) of preparing a fiber sheet containing SiO 2 having a weight per unit area of 20 g/m ² by thermally bonding the laminated fibers at a temperature of 240° C.; and
An etching step (S700) of dipping the fiber sheet containing SiO2 into a mixed solution of 49% HF and EtOH at a mass ratio of 1:1 for 60 seconds to etch and convert it into Si;
A porous PET fiber sheet manufacturing step (S800) of washing the etched SiO2-containing fiber sheet with distilled water and drying it using N ₂ gas to prepare a porous PET fiber sheet;
An active material application step (S900) of applying the active material to the electrode plate; and
An electrode plate completion step (S1000) for manufacturing an electrode plate by placing the porous PET fiber sheet on the electrode plate coated with the active material, putting it in a dryer and drying it at a high temperature, by applying a porous polyester nonwoven fabric comprising: Method for manufacturing electrode plates for lead-acid batteries to improve ion mobility.
According to claim 1,
By applying the porous PET fiber sheet to the electrode plate, the ion mobility is improved due to the formation of micropores and the improvement of the porosity, thereby improving the efficiency during charging and discharging, and applying a porous polyester nonwoven fabric, characterized in that the capacity and basic performance are improved. Method for manufacturing an electrode plate for a lead-acid battery to improve ion mobility by
According to claim 1,
The continuous extruder,
After stretching, the amount of discharge and the number of capillaries in the cap are adjusted so that the average fineness of the produced fiber is 25um. According to claim 1,
By the method of manufacturing an electrode plate for a lead-acid battery that improves ion mobility by applying the porous polyester nonwoven fabric,
If the capacity of the manufactured lead-acid battery is 80Ah ~ 87Ah,
The life span is 1,920 cycles to 2,900 to 2,920 cycles, and a lead-acid battery electrode plate manufacturing method for improving ion mobility by applying a porous polyester nonwoven fabric, characterized in that it can provide durability improvement in the range of 51 to 52%.
Produced by the method of claim 1,
Lead-acid battery electrode plate containing porous polyester nonwoven fabric.

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