KR102580195B1 - Grid manufacturing method for lead-acid batteries with increased active material adhesion and improved electrical conductivity through improved roughness by shot blasting surface treatment - Google Patents

Abstract

The present invention relates to a method of manufacturing a grid for a lead-acid battery that increases the adhesion of active materials and improves electrical conductivity by improving the roughness through shot blast surface treatment. More specifically, it relates to a method of manufacturing a grid for a lead acid battery through shot blast surface treatment before the stamping process of the strip. The roughness is increased by artificially creating a plurality of grooves of a certain size on the surface of the strip, and the roughness and surface area of the grid surface are increased due to the plurality of grooves of a certain size, providing the effect of improving the adhesion of the active material when applying the active material to the grid. , Accordingly, it relates to a method of manufacturing a grid for a lead-acid battery that increases the adhesion of active materials and improves electrical conductivity through improved roughness through shot blast surface treatment, which can improve the basic performance (CCA) of the lead-acid battery and early end of life.

Description

Grid manufacturing method for lead-acid batteries with increased active material adhesion and improved electrical conductivity through improved roughness by shot blasting surface treatment}

The present invention relates to a method of manufacturing a grid for a lead-acid battery that increases the adhesion of active materials and improves electrical conductivity by improving the roughness through shot blast surface treatment. More specifically, it relates to a method of manufacturing a grid for a lead acid battery through shot blast surface treatment on a strip before the stamping process of the strip. The roughness is increased by artificially creating a plurality of grooves of a certain size on the surface of the strip, and the roughness and surface area of the grid surface are increased due to the plurality of grooves of a certain size, providing the effect of improving the adhesion of the active material when applying the active material to the grid. , Accordingly, it relates to a method of manufacturing a grid for a lead-acid battery that increases the adhesion of active materials and improves electrical conductivity through improved roughness through shot blast surface treatment, which can improve the basic performance (CCA) of the lead-acid battery and early end of life.

Currently, the lead acid battery active material mechanism adds polyester-based fiber to the active material to secure physical strength and a surface area for reaction with sulfuric acid.

Typically, polyester-based fibers with a fineness of 0.8 to 5 denier and a length of 1 to 10 mm are added to the lead acid battery active material, and these fibers have excellent acid resistance and oxidation resistance.

At this time, the organic synthetic short fibers added typically have a circular cross-section and are about 2 to 10 mm in length.

The ingredients of organic synthetic short fibers are mainly polypropylene, polyester, and modacrylic, which have excellent acid and oxidation resistance.

The prior art, Korean Patent Registration No. 10-0603908, “electrode plate for storage battery and method for manufacturing the same,” is to manufacture an electrode plate by attaching fiber-reinforced paper by applying pressure so that fiber filaments are embedded on the surface of the active material and filling the uneven portions of the surface with the active material. Disclose the method.

The above-mentioned conventional Korean registered patent relates to "electrode plates for storage batteries and their manufacturing method," in which an active material with electrochemical activity is applied to a substrate that serves as a passage for electricity to flow, and fiber-reinforced paper is applied to the surface of the active material. In the attaching or pressing step, pressure is applied so that the fiber filaments of the fiber-reinforced paper are embedded to a certain depth, and the surface irregularities of the fiber-reinforced paper are filled with the active material to increase the bonding surface area, thereby preventing the active material from being detached from the substrate. Technology that improves the initial high-rate discharge characteristics of the electrode plate due to the porosity of the fiber-reinforced paper and extends the life of the storage battery by retaining and supporting the active material due to the stable support and acid resistance of the fiber filament structure of the fiber-reinforced paper. It's about.

Until now, lead (Pb)-calcium (Ca)-tin (Sn) alloy has been used as the grid alloy for lead acid batteries, but this alloy composition alone cannot sufficiently respond to the harsh operating environment (high temperature and overcharge phenomenon), leading to corrosion or corrosion of the grid. It has been pointed out as a problem that the lifespan of lead acid batteries is shortening due to deformation due to growth.

Accordingly, there is a need to improve grid corrosion resistance, mechanical strength, and suppress growth deformation.

Meanwhile, the active materials of conventional lead acid batteries are generally based on lead powder and aqueous sulfuric acid solution, and other additives are mixed according to the characteristics of the anode and cathode and then mixed to make the active material.

The active material made in this way goes through a coating process, which is a process of applying it to a substrate, and then goes through a maturation process and drying process depending on the positive/cathode characteristics, and then multiple sheets of prepared positive and negative electrode plates are alternately overlapped to prevent electrical short-circuiting between the electrode plates. For this purpose, a non-conductive separator is installed so that the positive electrode plate, negative electrode plate, and separator plate form a group of electrode plates.

Several groups of electrode plates are connected in series according to the capacity of the storage battery and accommodated in the cell.

The received group of electrode plates undergoes a supercharged chemical process to obtain electrical properties. At this time, the active material of the positive plate is lead dioxide (PbO2), and due to its characteristics, countless fine particles of oxidized lead are combined, and the particles are rich in porosity. Electrolytes are allowed to freely diffuse and penetrate the liver.

In addition, the active material of the negative electrode plate is spongy lead (Pb), which is also rich in porosity and reactivity, allowing the electrolyte to freely diffuse and penetrate.

Only then can products made in this way become available on the market.

In addition, to facilitate the initial charging process and improve the durability of the product, separate aging and drying processes are performed for each polarity.

The aging process of the positive plate is an important process that increases the durability of the product. The hot temperature of steam (approximately 70 ~ 100℃) and moisture (humidity of 99% or more) convert lead (Pb), a component of the active material, into lead oxide (lead oxide). Not only does it change it to PbO), but it also changes the crystal structure of the active material.

If the negative electrode plate is left in natural conditions without any additional processing, it can be aged and dried at the same time.

However, if sufficient aging and drying are not achieved, the electrode plates stick together during the assembly process to form the electrode group, and the durability of the active material decreases due to the presence of moisture, so the active material embedded between the substrates easily falls off even with a small impact.

As the number of charging and discharging of a lead-acid battery made through this process increases, the active material falls off the substrate more easily due to the reaction between lead and sulfuric acid, and the fallen active materials can no longer participate in the reaction, ultimately leading to the breakdown of the lead-acid battery. By degrading performance, the lifespan of lead acid batteries is usually only 1 to 2 years.

Therefore, there is a need for a manufacturing process that can improve the durability and performance of lead acid batteries in line with the current demand for high-performance lead acid batteries.

Meanwhile, lead acid batteries are usually attached by applying the active material to the grid and then pressing non-woven PET or tissue paper onto 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 or tissue paper) is characterized by acid resistance, heat resistance, and oxidation resistance.

However, since these supports only support the active material by compression when applying the active material to the grid, when mounted on a vehicle and used, the removal of the active material from the grid is accelerated depending on the user's usage conditions, environmental conditions, and driving conditions, leading to battery capacity loss. And it caused a decrease in starting power or premature end of life.

Therefore, there is a need for a manufacturing process that can improve lead acid battery durability and performance while maintaining acid resistance, heat resistance, and oxidation resistance characteristics.

Republic of Korea Patent Registration No. 10-0483246

Therefore, the present invention was devised to solve the above conventional problems,

Before the stamping process of the strip of the present invention, the roughness of the grid surface is increased by artificially creating a plurality of grooves of a certain size on the surface of the strip through shot blast surface treatment, so that the roughness and surface area of the grid surface are increased due to the plurality of grooves of a certain size, The purpose is to improve the adhesion of the active material when applying it.

In order to achieve the problem to be solved by the present invention, a method of manufacturing a grid for a lead acid battery that increases active material adhesion and improves electrical conductivity by improving roughness by shot blast surface treatment according to an embodiment of the present invention is,

Grid manufacturing step (S100) of manufacturing a lead acid battery grid; and

A shot blast surface treatment step (S200) in which the surface of the manufactured grid is treated using a shot blast processing machine to form a plurality of fine grooves to form a rough surface.

A micro-groove active material penetration step (S300) of applying an active material to the rough surface-treated grid, thereby infiltrating the active material into a plurality of micro-grooves formed on the surface of the grid;

Including a shot blast surface treatment grid hardening step (S400) for manufacturing a lead acid battery electrode plate in which the grid with the active material infiltrated into the plurality of fine grooves is put into a dryer and dried at a high temperature to increase the adhesion between the active material and the grid. By doing so, the problem of the present invention is solved.

Through the present inventor's method of manufacturing a grid for lead acid batteries that increases the adhesion of active materials and improves electrical conductivity by improving the roughness through shot blast surface treatment, a certain size is formed on the surface of the strip through shot blast surface treatment before the stamping process of the strip. By artificially creating multiple grooves to increase the roughness, the roughness and surface area of the grid surface are increased due to the multiple grooves of a certain size. This improves the adhesion of the active material when applying the active material to the grid, improving the basic performance (CCA) of the lead acid battery. And it provides the effect of improving the premature end of life.

Figure 1 is a process diagram of a method for manufacturing a grid for a lead-acid battery in which active material adhesion is increased and electrical conductivity is improved by improving roughness through shot blast surface treatment according to an embodiment of the present invention.
Figure 2 is an image of an electrode plate manufactured by a method of manufacturing a grid for a lead-acid battery in which active material adhesion is increased and electrical conductivity is improved by improving roughness through shot blast surface treatment according to an embodiment of the present invention.

A method for manufacturing a grid for a lead-acid battery that increases active material adhesion and improves electrical conductivity by improving roughness through shot blast surface treatment according to an embodiment of the present invention,

Grid manufacturing step (S100) of manufacturing a lead acid battery grid; and

A shot blast surface treatment step (S200) in which the surface of the manufactured grid is treated using a shot blast processing machine to form a plurality of fine grooves to form a rough surface.

A micro-groove active material penetration step (S300) of applying an active material to the rough surface-treated grid, thereby infiltrating the active material into a plurality of micro-grooves formed on the surface of the grid;

Including a shot blast surface treatment grid hardening step (S400) for manufacturing a lead acid battery electrode plate in which the grid with the active material infiltrated into the plurality of fine grooves is put into a dryer and dried at a high temperature to increase the adhesion between the active material and the grid. It is characterized by:

At this time, in the shot blast surface treatment grid hardening step (S400),

The high temperature is characterized as being within the range of 300°C to 400°C.

At this time, in the shot blast surface treatment step (S200),

By producing a grid so that the active material penetrates into fine grooves of a certain size, the electrical conductivity of the lead acid battery is improved and the adhesion of the active material is improved, thereby improving the low temperature starting ability and high temperature durability of the lead acid battery.

At this time, the shot blast surface treatment step (S200) is,

It is characterized by being able to form fine grooves with a depth of 40 to 70 um by providing a hammer effect using a shot blast processing machine.

At this time, by using the manufacturing method of the present invention, it is possible to provide a lead acid battery including a grid with increased active material adhesion and improved electrical conductivity through improved roughness through shot blast surface treatment.

At this time, in the shot blast surface treatment grid hardening step (S400),

Dry at room temperature for 12 hours and then pre-heat-treat for 1 hour at 200°C in a dryer.

Finally, heat treatment is performed in a dryer at a temperature of 300°C to 400°C for 1 hour to ensure that there are no cracks or pores and that stable bonding between the grid and the active material is possible.

Hereinafter, a method for manufacturing a grid for a lead-acid battery with improved adhesion to active materials and improved electrical conductivity through improved roughness through shot blast surface treatment according to the present invention will be described in detail through examples.

Figure 1 is a process diagram of a method for manufacturing a grid for a lead-acid battery in which active material adhesion is increased and electrical conductivity is improved by improving roughness through shot blast surface treatment according to an embodiment of the present invention.

As shown in Figure 1, the present invention's method of manufacturing a grid for a lead-acid battery with increased adhesion to active materials and improved electrical conductivity through improved roughness through shot blast surface treatment,

Grid manufacturing step (S100) of manufacturing a lead acid battery grid; and

A shot blast surface treatment step (S200) in which the surface of the manufactured grid is treated using a shot blast processing machine to form a plurality of fine grooves to form a rough surface.

A micro-groove active material penetration step (S300) of applying an active material to the rough surface-treated grid, thereby infiltrating the active material into a plurality of micro-grooves formed on the surface of the grid;

Including a shot blast surface treatment grid hardening step (S400) for manufacturing a lead acid battery electrode plate in which the grid with the active material infiltrated into the plurality of fine grooves is put into a dryer and dried at a high temperature to increase the adhesion between the active material and the grid. I do it.

In the present invention, when going through the above process, before the stamping process of the strip, the surface of the strip is shot blasted to artificially create a plurality of grooves of a certain size on the surface of the strip to increase the roughness, so that the grid surface has a plurality of grooves of a certain size. By increasing the roughness and surface area, the adhesion of the active material is improved when applying the active material to the grid, thereby improving the basic performance (CCA) and early end of life of the lead acid battery.

In other words, it was confirmed through experiments that the adhesion of the active material was improved through the shot blast surface treatment process, which ultimately improved the basic performance (CCA) of the lead acid battery through improved electrical conductivity and improved early end of life.

Additionally, the cause of lead acid battery failure depends on the type of load and how it is managed during use.

The main failure factors include active material sulphation, loss of electrode active material, anode lattice corrosion, separator damage, and complex factors.

In particular, in the case of products installed in automobiles, active material sulphation is accelerated depending on operating conditions and battlefield usage load, and electrode plate active material falls off, resulting in premature termination of life.

Therefore, it is important to reduce the acceleration of active material dropping from the grid.

In conclusion, before the stamping process of the strip, a number of grooves of a certain size are artificially created on the surface of the strip through shot blast surface treatment, thereby increasing the roughness and improving the adhesion of the active material when applying the active material to the grid, which is the main cause of lifespan termination. Sulphation delay and deactivation problems were improved.

In order to provide the above functions, a grid of a lead acid battery is manufactured through the grid manufacturing step (S100) of the present invention.

Thereafter, through the shot blast surface treatment step (S200), the surface of the manufactured grid is surface treated using a shot blast processing machine to form a plurality of fine grooves and thereby form a rough surface.

To explain specifically, the grid of a lead acid battery is generally supplied by controlling the amount of lead alloy to be melted, and the lead alloy is infiltrated into the mold groove to form a casting circle through strip casting, and is made to the thickness to be used through a rolling process.

The strip created in this way is created into the desired grid shape through a stamping process, and the active material is pressed to the grid through a coating process and fixed through a drying and aging process.

However, when applying the active material to the grid, the active material is supported on the grid through a compression and drying process using non-woven fabric.

In addition, when using a lead acid battery, the removal of active materials from the grid is accelerated depending on the high temperature environment and operating environment, resulting in a decrease in battery capacity and early end of life.

Therefore, in order to improve this phenomenon, before the stamping process of the strip, the roughness is increased by artificially creating a plurality of grooves of a certain size on the surface of the strip through shot blast surface treatment.

The strip created in this way is made into a grid through a stamping process, and the roughness and surface area of the grid surface are increased due to the multiple grooves of a certain size.

It was confirmed through experiments that this can help improve the adhesion of the active material when applying it to the grid.

In general, blasting methods are divided into dry and wet methods. Dry blasting refers to using abrasives without water to remove scale, rust, and coating films, and to create roughness on the surface of the base material. Wet blasting refers to the use of abrasives without water. By powerfully spraying water with abrasives such as sand, steel shot, grit, or silica particles on the surface of the material using compressed air or other methods, scale, rust, and coating films are removed, and roughness is formed on the surface of the base material. It means to do.

To summarize, the blasting method is a type of method that treats the surface of processed items such as steel, using compressed air or water mixed with relatively hard abrasives such as sand, iron powder, grit, quartzite particles, and combustible materials. This is a cleaning method that removes foreign substances (rust, oil, paint, scale, etc.) from the surface of steel by powerfully spraying it using other methods.

The blasting method is a core pretreatment process for painting, including sand blasting, which projects mineral particles such as silica sand or abrasives, shot blasting, which projects iron powder or cut wire, and iron with sharp angles. There is grit blasting to project the pieces.

The sandblasting refers to a processing method that sprays an abrasive from a nozzle to refine or cut the surface of a material, and is currently mainly used for rust removal, surface contamination removal, protrusion removal, and pretreatment for adhesion or plating.

When the sandblasting method as described above is introduced into the present invention, problems arise such as deformation of the strip or dents in the strip during the spraying process of increasing the particle size for deep processing, causing some parts to fall off.

Therefore, instead of the above method, the shot blast method was used in the present invention.

Meanwhile, in general, any one of the electrolytic deposition method, etching method, sandblasting method, roll transfer method, metal spraying method, or powder sintering method is used to roughen the surface of the metal sheet. In the present invention, the above method is used. It is characterized by using the shot blast method without using it.

That is, the shot blast surface treatment step (S200) is,

It is characterized by being able to form fine grooves with a depth of 40 to 70 um by providing a hammer effect using a shot blast processing machine.

As described above, through the shot blast surface treatment step (S200), a grid is manufactured to allow the active material to penetrate into the formed micro grooves of a certain size, thereby improving the electrical conductivity of the lead acid battery and the adhesion of the active material, thereby improving the low-temperature starting power of the lead acid battery. And it is possible to provide the effect of improving high temperature durability.

In other words, the shot blast processing machine can control the size of fine grooves by adjusting the size of fine spheres. In the present invention, a shot blasting technique using spheres of 0.4 to 0.6 mm in size is performed to form constant fine grooves with a depth of 40 to 70 um. It will happen.

Therefore, if the size of the sphere is less than 0.4mm, the depth of the micro groove is less than 40um, so the active material cannot properly penetrate the grid surface, and the desired durability and basic performance cannot be achieved in the present invention. If the sphere size is 0.6mm, the active material cannot penetrate the grid surface properly. If it is exceeded, the depth of the microgroove is formed to exceed 70um, which may cause cracks or bending in the grid, so a sphere size within the above range must be provided.

Thereafter, by applying the active material to the rough surface-treated grid through the micro-groove active material penetration step (S300), the active material penetrates into the plurality of micro-grooves formed on the surface of the grid, thereby improving the bearing capacity for the active material.

Afterwards, through the shot blast surface treatment grid hardening step (S400), the grid with the active material infiltrated into the plurality of micro grooves is put into a dryer and dried at high temperature to manufacture a lead acid battery plate with increased adhesion between the active material and the grid. It will happen.

Specifically, in the shot blast surface treatment grid hardening step (S400),

The high temperature is characterized as being within the range of 300°C to 400°C.

The critical significance of performing high temperature treatment within the above range is that, as shown in Table 2, the lifespan at about 200°C is higher than the conventional 238 cycles, but it provides a slight lifespan extension effect of 20% or less, and at 400°C The lifespan at temperatures exceeding 238 cycles is not much different from the conventional 238 cycles, which is believed to be because cracks occur at high temperatures exceeding 400°C.

Therefore, it is desirable to carry out curing within the above-described temperature range.

Meanwhile, in the shot blast surface treatment grid hardening step (S400),

Dry at room temperature for 12 hours and then pre-heat-treat for 1 hour at 200°C in a dryer.

Finally, heat treatment is performed in a dryer at a temperature of 300°C to 400°C for 1 hour to ensure that there are no cracks or pores and that stable bonding between the grid and the active material is possible.

At this time, if the temperature exceeds 200°C during the preheating process, cracks may occur between the grid and the active material applied during the final heat treatment, and if the temperature is below the above temperature, stable bonding with the active material in the grid is not possible. It would be desirable to comply with .

Afterwards, it is finally heat treated in a dryer at a temperature of 300°C to 400°C for 1 hour to ensure that there are no cracks or pores and that stable bonding between the grid and the active material is possible.

At this time, the lifespan at temperatures exceeding 400 degrees is not much different from the conventional 238 cycles. This is believed to be because cracks occur at high temperatures exceeding 400 degrees, so the drying process is performed for 1 hour set within the above temperature range. Only then can the most optimal life cycle be provided.

As described above, in order to determine the effect of the present invention, the active material was applied to a conventional grid, and then the basic performance and A lifespan test was conducted.

The conventional products described below refer to products manufactured using electrode plates containing non-woven fabric as the active material used in the lead acid battery (BX80) manufactured by the applicant, and the improved products are electrode plates subjected to a shot blast surface treatment through the manufacturing method of the present invention. refers to a product that contains

In addition, through subsequent processes such as assembly and chemical conversion to provide electrical conductivity to the substrate, a conventional product (electrode plate containing non-woven fabric as an active material) and an improved product (shot blast surface treatment) with a final capacity of 70 Ah (20 hour rate capacity) are produced. electrode plates for lead-acid batteries) were manufactured, and charge acceptability and 50% DoD durability tests were conducted to prove the effectiveness of the shot-blasted surface-treated electrode plates.

1) Charge Acceptance test (CA: Charge Acceptance test)

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

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

As a result of the test, it was found that the improved product had high electrical conductivity and charging efficiency, increasing the current by 41% in about 10 minutes compared to the conventional product.

division hour Conventional products improvement




Charge income 1 min 27.25 28.97 2 minutes 24.21 27.95 3 minutes 22.14 27.32 4 minutes 21.25 26.72 5 minutes 20.11 25.75 6 minutes 19.35 24.86 7 minutes 18.74 24.44 8 minutes 17.68 23.62 9 minutes 17.04 23.22 10 minutes 16.43 23.11

Typically, lead acid batteries are attached by applying active material to the grid and then pressing non-woven PET or tissue paper onto 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 or tissue paper) is characterized by acid resistance, heat resistance, and oxidation resistance.

However, since this support supports the active material only by compression when applying the active material to the grid, when it is installed and used in a vehicle, the removal of the active material from the grid is accelerated depending on the user's usage conditions, environmental conditions, and driving conditions, thereby reducing the battery capacity. And it causes a decrease in starting power or premature end of life.

However, in the case of the above method, problems arose in providing performance in an environment that requires increasingly higher basic performance.

On the other hand, in the present invention, in order to improve this problem, the roughness was improved by using a shot blast process to ensure excellent adhesion of the active material.

Therefore, the adhesion of the active material is improved, and ultimately, the basic performance (CCA) of the lead acid battery is improved and the early end of life is improved.

The shot blasting method used in the present invention rotates fine metal/non-metal particles at a speed of about 2000 RPM and sprays them at a high speed of 60 to 100 m/s to increase the roughness of the metal surface and remove rust or coating.

In the case of the above shot blasting, small spherical particles create grooves with a depth of 40 to 70 um through the hammer effect rather than scraping the surface to a level of 0.4 to 0.6 mm.

After producing the grid, the active material is applied. At this time, the active material penetrates into the grooves of the grid surface and is applied.

After application, it was confirmed through experiments that the electrode plate that went through the drying and maturation process improved the adhesion of the active material compared to the conventional electrode plate, improving the lifespan of the lead acid battery by improving the lifespan due to loss of the active material in a high temperature environment. did.

2) Accelerated life test (SAE J2801)

The lead acid battery is subjected to 34 charge/discharge cycles in a water bath at 75°C for approximately one week, similar to typical vehicle conditions.

After performing 34 cycles, the life test is conducted by discharging at 200A for 10 seconds, and if the voltage is maintained above 7.2V, the cycle is repeated 34 times.

In addition, the test is stopped when the current at the end of the charging phase during the cycle rises above 15A or when the voltage falls below 12.0V during rest, or when the voltage falls below 7.2V during the weekly verification phase when discharging 200A.

Table 2 below shows the results of the SAE J2801 test, showing the voltage when discharged at 200A for 10 seconds for every 34 charge/discharge cycles.

cycle asperity
Unapplied Roughness applied + preheat treatment not applied Apply roughness + apply preheat treatment + dry at 200 degrees Apply roughness + apply preheat treatment + dry at 350 degrees Apply roughness + apply preheat treatment + dry at 450 degrees 34 11.82 11.83 11.85 11.88 11.82 68 11.76 11.77 11.80 11.84 11.70 102 11.72 11.73 11.78 11.82 11.62 136 11.69 11.71 11.76 11.79 11.59 170 11.65 11.68 11.74 11.75 11.50 204 11.55 11.61 11.69 11.71 11.42 238 11.43 11.45 11.60 11.68 11.30 272 7.2 and below 11.20 11.49 11.62 7.2 and below 306 7.2 and below 7.2 and below 11.59 340 11.55 374 11.51 408 7.2 and below

In the case of Table 2 above, when shot blasting was not applied, the lifespan was 238 cycles, and when shot blasting was applied but no preheating process was performed, the lifespan was 306 cycles.

Meanwhile, shot blasting and preheat treatment were applied, but when dried at a temperature of 200 degrees, it improved from 238 cycles to 306 cycles, but it was confirmed that there was no significant improvement for the application of preheat treatment.

However, by applying shot blasting, preheating, and drying at a temperature of 350 degrees, it was found that the lifespan was improved by 57% from 238 cycles to 374 cycles.

Therefore, it was found that the most desirable drying temperature was 350 degrees within 300 to 400 degrees.

Meanwhile, after applying shot blasting, preheating, and drying at a temperature of 450 degrees, which exceeds 400 degrees, it was found that the cycle returned to 238. This is believed to be because cracks occur at very high temperatures exceeding 400 degrees. .

Therefore, it is desirable to carry out curing within the above-described temperature range.

3) Basic performance test (SAE CCA)

division Conventional products improvement SAE CCA 10sec, V (630A discharge) 7.4V 7.8V

As shown in Table 3 and Figure 3, the basic performance test (SAE CCA) was 7.4V for the conventional product, but was 7.8V for the improved product, showing a 5% improvement in basic performance.

Therefore, in the case of a lead acid battery including an electrode plate provided with a rough surface by shot blasting, electrical conductivity and basic performance can be improved.

Through the above manufacturing method, before the stamping process of the strip, a number of grooves of a certain size are artificially created on the surface of the strip through shot blast surface treatment to increase the roughness, so that the grid surface has a roughness and surface area due to the number of grooves of a certain size. By increasing this, the adhesion of the active material is improved when applying the active material to the grid, thereby providing the effect of improving the basic performance (CCA) of the lead acid battery and early end of life.

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

S100: Grid manufacturing stage
S200: Shot blast surface treatment step
S300: Microgroove active material penetration step
S400: Shot blast surface treatment grid hardening stage

Claims (5)

In the method of manufacturing a grid for a lead-acid battery that increases the adhesion of active materials and improves electrical conductivity by improving the roughness through shot blast surface treatment,
Grid manufacturing step (S100) of manufacturing a lead acid battery grid; and
A shot blast surface treatment step (S200) in which the surface of the manufactured grid is treated using a shot blast processing machine to form a plurality of fine grooves to form a rough surface.
A micro-groove active material penetration step (S300) of applying an active material to the rough surface-treated grid, thereby infiltrating the active material into a plurality of micro-grooves formed on the surface of the grid;
Including a shot blast surface treatment grid hardening step (S400) for manufacturing a lead acid battery electrode plate in which the grid with the active material infiltrated into the plurality of fine grooves is put into a dryer and dried at a high temperature to increase the adhesion between the active material and the grid. Characterized by:
In the shot blast surface treatment grid hardening step (S400),
The high temperature is characterized as being within the range of 300℃ to 400℃,
The shot blast surface treatment grid hardening step (S400),
Dry at room temperature for 12 hours and then pre-heat-treat for 1 hour at 200°C in a dryer.
By heat treating for 1 hour within the range of 300°C to 400°C in a dryer, there are no cracks or pores, and stable bonding between the grid and the active material is possible.
In the shot blast surface treatment step (S200),
By producing a grid so that the active material penetrates into fine grooves of a certain size, the electrical conductivity of the lead acid battery is improved and the adhesion of the active material is improved, thereby improving the low temperature starting ability and high temperature durability of the lead acid battery.
The shot blast surface treatment step (S200),
It is characterized by being able to form fine grooves at a certain depth by providing a hammer effect using a shot blast processing machine.
The depth is,
It is characterized by being formed with fine grooves with a depth of 40 to 70 um.
When increasing the adhesion of the active material and improving the electrical conductivity by improving the roughness through shot blast surface treatment, the charge acceptability is characterized by being able to provide a 41% improvement in current from 16.43 to 23.11,
In the case of basic performance, a grid manufacturing method for lead acid batteries that increases active material adhesion and improves electrical conductivity through improved roughness through shot blast surface treatment, which can provide a 5% increase from 7.4V to 7.8V.
delete delete delete By the manufacturing method of claim 1,
A lead-acid battery containing a grid that increases active material adhesion and improves electrical conductivity through improved roughness through shot blast surface treatment.