KR20210150768A - Lead-acid battery separator manufacturing method with reinforced edge contact - Google Patents

Abstract

The present invention relates to a lead-acid battery separator manufacturing method with a reinforced electrode edge contact part, and more particularly, to a lead-acid battery separator manufacturing method with a reinforced electrode edge contact part to improve the mechanical strength of the contact part of the electrode edge so that a hole is prevented from being easily formed in the separator even with various electrode edge defects. In addition, a rib spacing of the electrode edge contact part is reduced to 0.5mm, so that the area of a thin back web is reduced.

Description

The lead-acid battery separator manufacturing method with reinforced edge contact

The present invention relates to a method for manufacturing a lead-acid battery separator with reinforced pole plate edge contact, and more particularly, to improve the mechanical strength of the pole plate edge contact part so that a hole is not easily formed in the separator even with various pole plate edge defects. It relates to a method for manufacturing a reinforced lead-acid battery separator.

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

Typically, polyester-based fibers having 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 (fibers) have excellent acid resistance and oxidation resistance.

At this time, the organic synthetic short fibers added usually have a circular cross-sectional shape and have a length of about 2 to 10 mm.

The components of organic synthetic short fibers are mainly polypropylene, polyester, and modacrylic with excellent acid and oxidation resistance.

The prior art, Republic of Korea Patent Registration No. 10-0603908, "Electrode plate for storage battery and method for manufacturing the same", is to manufacture an electrode plate by applying pressure to attach fiber-reinforced paper to the surface of the active material so that fiber filaments are embedded, and then filling the concavo-convex part of the surface with the active material. method is disclosed.

The above-mentioned prior Korean patent registration relates to "a electrode plate for a storage battery and a method for manufacturing the same". The electrode plate of a storage battery is coated with an active material having electrochemical activity on 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 step of attaching or pressing, pressure is applied so that the fiber filaments of the fiber-reinforced paper are embedded to a certain depth, and the active material is filled in the uneven surface of the fiber-reinforced paper to increase the binding surface area, thereby preventing the active material from being detached from the substrate. Technology to prevent and further improve the initial high-rate discharge characteristics of the electrode plate due to the porosity of the fiber-reinforced paper, and to extend the life of the storage battery by holding and supporting the active material due to the stable support and acid resistance of the fiber-filament structure of the fiber-reinforced paper is about

So far, lead (Pb)-calcium (Ca)-tin (Sn)-based alloys have been used as grid alloys for lead-acid batteries. It is pointed out as a problem that the lifespan of the lead-acid battery is shortened due to deformation due to the growth of the battery.

Accordingly, it is required to improve the corrosion resistance, mechanical strength, and suppress growth deformation of the grid.

On the other hand, in general, the type that accounts for most of lead acid battery manufacturing defects is that the edge of the electrode plate is folded during the manufacturing process, or a small hole is made in the separator due to cutting and misalignment of the electrode plate, and the positive electrode material and the negative electrode material come into contact through the hole. It is a short-circuit phenomenon.

Therefore, it is possible to improve the durability and performance of lead-acid batteries according to the current demand for high-performance lead-acid batteries, and it is possible to improve the mechanical strength of the contact parts of the poles so that holes are not easily formed in the separator even with various pole edge defects. There is a situation in which a manufacturing process of the method is required.

Republic of Korea Patent Registration No. 10-0924413

Therefore, the present invention has been devised to solve the above problems of the prior art,

It is an object of the present invention to provide a method for manufacturing a lead-acid battery separator with reinforced pole plate edge contact to improve the mechanical strength of the pole plate edge contact part so that a hole is not easily formed in the separator even with various pole plate edge defects.

Another object of the present invention is to reduce the back web area of a thin thickness by reducing the rib spacing of the electrode plate edge contact portion to 0.5mm.

In order to achieve the object to be solved by the present invention, a method for manufacturing a lead-acid battery separator reinforced with an electrode plate edge contact portion according to an embodiment of the present invention,

In the lead-acid battery separator manufacturing process,

A mixture preparation step (S100) for the central part of the separator to prepare a mixture for the central part of the separator in which 10 to 30 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer are mixed; and

40 to 50 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer to prepare a mixture for edges of a mixture manufacturing step (S200) for the edge of the separator; and

A mixture input step (S300) for putting the mixture for the central part of the separator into the extruder for the central part, and injecting the mixture for the edge into the extruder for the edge (S300); and

Simultaneous extrusion separation membrane manufacturing step (S400) for performing simultaneous extrusion by providing a mixture for the center portion and an edge mixture to the center portion and the edge through each extruder nozzle formed in the extruder for the central portion and the extruder for the edge portion (S400) By including; to solve the problem of the present invention.

The present invention provides the effect of improving the mechanical strength of the electrode plate edge contact portion so that a hole is not easily formed in the separator even in various electrode plate corner defects through the method of manufacturing a lead acid battery separator with reinforced electrode plate edge contact portion.

In addition, it provides the effect of reducing the back web area of a thin thickness by reducing the rib spacing of the contact part of the electrode plate to 0.5mm.

1 is a process diagram of a method for manufacturing a lead-acid battery separator reinforced with an electrode plate edge contact portion according to an embodiment of the present invention.
2 is an exemplary view showing a conventional separation membrane.
3 is an exemplary view showing a separator manufactured by the method for manufacturing a lead-acid battery separator reinforced with an electrode plate edge contact portion according to an embodiment of the present invention.

A method for manufacturing a lead-acid battery separator reinforced with an electrode edge contact portion according to an embodiment of the present invention,

In the lead-acid battery separator manufacturing process,

A mixture preparation step (S100) for the central part of the separator to prepare a mixture for the central part of the separator in which 10 to 30 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer are mixed; and

40 to 50 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer to prepare a mixture for edges of a mixture manufacturing step (S200) for the edge of the separator; and

A mixture input step (S300) for putting the mixture for the central part of the separator into the extruder for the central part, and injecting the mixture for the edge into the extruder for the edge (S300); and

Simultaneous extrusion separation membrane manufacturing step (S400) for performing simultaneous extrusion by providing a mixture for the center portion and an edge mixture to the center portion and the edge through each extruder nozzle formed in the extruder for the central portion and the extruder for the edge portion (S400) It is characterized in that it contains;

At this time, the contact portion of the separator in contact with the edge of the electrode plate,

It is characterized in that the rib spacing is formed to be less than 0.5 mm.

At this time, through the simultaneous extrusion membrane manufacturing step (S400),

The contact portion in contact with the edge of the electrode plate of the prepared separator is characterized in that the mechanical strength is improved.

At this time, by the manufacturing method of the present invention,

To provide a lead-acid battery including an electrode plate for a lead-acid battery to which a lead-acid battery separator with a reinforced lead-acid battery separator is applied.

Hereinafter, it will be described in detail through an embodiment of a method for manufacturing a lead-acid battery separator reinforced with an electrode plate edge contact portion according to the present invention.

1 is a process diagram of a method for manufacturing a lead-acid battery separator reinforced with an electrode plate edge contact portion according to an embodiment of the present invention.

As shown in FIG. 1, the method for manufacturing a lead-acid battery separator reinforced with the electrode plate edge contact part of the present invention is,

In the lead-acid battery separator manufacturing process,

A mixture preparation step (S100) for the central part of the separator to prepare a mixture for the central part of the separator in which 10 to 30 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer are mixed; and

40 to 50 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer to prepare a mixture for edges of a mixture manufacturing step (S200) for the edge of the separator; and

A mixture input step (S300) for putting the mixture for the central part of the separator into the extruder for the central part, and injecting the mixture for the edge into the extruder for the edge (S300); and

Simultaneous extrusion separation membrane manufacturing step (S400) for performing simultaneous extrusion by providing a mixture for the center portion and an edge mixture to the center portion and the edge through each extruder nozzle formed in the extruder for the central portion and the extruder for the edge portion (S400) It is characterized in that it contains;

An object of the present invention is to provide a method for manufacturing a lead-acid battery separator reinforced with an pole plate edge contact to improve the mechanical strength of the pole plate edge contact part so that a hole is not easily formed in the separator even with various pole plate edge defects.

The separator of the lead-acid battery described in the present invention is a low-resistance, non-conductive porous membrane that is positioned between two electrodes to prevent a short circuit due to physical contact between the electrodes and to transfer ions through pores in the separator.

In addition, it provides the characteristics of having mechanical strength and flexibility to withstand the physical impact applied from the electrode plate during battery charging/discharging, and chemical resistance to withstand the corrosion of sulfuric acid, an electrolyte.

At this time, as shown in Figure 2, a typical lead-acid battery separator is a polymer resin 10-30 wt%, inorganic filler 30-40 wt%, plasticizer 30-60 wt% after stirring the raw material to mix, the mixed raw material is manufactured in a sheet state through an extruder.

Therefore, the separator located at the center of the electrode plate or the separator located at the edge of the electrode plate provides the same mechanical strength, resulting in a short circuit at the edge.

To be specific, since the separator requires high porosity and low electrical resistance, the greater the content of the porous inorganic filler, the better, but the mechanical strength is lowered.

In general, the type that accounts for most of the manufacturing defects of lead acid batteries is that the edge of the electrode plate is folded during the manufacturing process or a small hole is made in the separator due to cutting and misalignment of the electrode plate, and the positive electrode material and the negative electrode material come into contact through the hole (short). ) is a phenomenon.

Therefore, in order to remove the short circuit phenomenon, the edge portion of the electrode plate is strengthened through the manufacturing method of the present invention.

The step of preparing the mixture for the central part of the separator (S100) is a step of preparing a mixture for the central part of the separator in which 10 to 30 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer are mixed.

That is, a mixture forming the central portion of the separation membrane is prepared using a polymer resin, an inorganic filler, and a plasticizer that are generally applied to use the separation membrane.

The step of preparing the mixture for the edge of the separator (S200) is a step of preparing a mixture for the edge in which 40 to 50 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer are mixed.

That is, in order to strengthen the mechanical strength of the edge of the separator, the content of the polymer resin is made higher than the content generally used, and a mixture for the edge is prepared.

The mixture input step (S300) is a step for inputting the mixture for the central part of the separator to the extruder for the central part, and injecting the mixture for the edge into the extruder for the edge.

That is, an extruder for the central part and an extruder for the edge are prepared, the mixture for the central part of the separator is put into the extruder for the central part, and the mixture for the edge is put into the extruder for the edge.

Thereafter, in the simultaneous extrusion separation membrane manufacturing step (S400), the mixture for the center portion and the edge mixture is provided to the center portion and the edge through each extruder nozzle formed in the extruder for the center portion and the extruder for the edge portion, and simultaneous extrusion is performed to perform the separation membrane is a manufacturing step.

That is, by using the co-extrusion method of the central part and the edge, the edge has a higher polymer resin content than the central part, thereby improving the mechanical strength of the separator, so that holes are not easily formed in the separator even with various pole edge defects. It provides the effect of improving the mechanical strength of

On the other hand, the contact portion of the separator in contact with the edge of the electrode plate,

It is characterized in that the rib spacing is formed to be less than 0.5 mm.

As shown in FIG. 3 , the rib spacing is formed to be 0.5 mm, and when the rib spacing of the electrode plate edge contact portion is reduced to 0.5 mm, the effect of reducing the back web area of a thin thickness is provided.

As a result, the present invention provides the effect of improving the mechanical strength of the electrode plate edge contact so that a hole is not easily formed in the separator even in various electrode plate corner defects.

In addition, it provides the effect of reducing the back web area of a thin thickness by reducing the rib spacing of the contact part of the electrode plate to 0.5mm.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those with general knowledge in the technical field to which the present application pertains can easily implement them. In particular, the technical spirit of the present invention and its core configuration and operation are not limited by this. In addition, the content of the present invention may be implemented in various other types of equipment, and is not limited to the implementation examples and embodiments described herein.

<Manufacturing Example> Manufacturing of lead-acid battery separator with reinforced electrode plate edge contact

The manufacturing method of the lead-acid battery separator reinforced with the electrode plate edge contact part according to an embodiment of the present invention is as follows.

As Experimental Example 1, 10 g of a polymer resin, 30 g of an inorganic filler, and 30 g of a plasticizer were added to a completely dried 1L stainless steel bowl to prepare a mixture for the central part of the separator.

40 g of polymer resin, 30 g of inorganic filler, and 30 g of plasticizer were put into a completely dried 1L stainless steel bowl to prepare a mixture for edges.

At this time, each stainless steel ball is mixed for 2 hours while heating to 120° C. using a heater until it becomes a dough-shaped dough.

For each dough prepared in the form of dough, the mixture for the middle part of the separator is put into an extruder for the central part, and the mixture for the edge is put into the extruder for the edge.

Thereafter, the separation membrane was manufactured by providing the mixture for the center part and the mixture for the edges to the center part and the edge part through each extruder nozzle formed in the extruder for the center part and the extruder for the edge part, and performing simultaneous extrusion.

As Experimental Example 2, 50 g of a polymer resin was prepared in the mixture for edges and prepared in the same manner as in Experimental Example 1.

Meanwhile, as Comparative Example 1, 10 g of a polymer resin, 30 g of an inorganic filler, and 30 g of a plasticizer were added to a completely dried 1 L stainless steel bowl to prepare a mixture.

At this time, the stainless steel ball is heated to 120° C. using a heater and mixed for 2 hours until it becomes a dough-shaped dough.

Each dough in the form of prepared dough was put into the extruder, and the mixture was extruded through the extruder nozzle to prepare a separation membrane.

As Comparative Example 2, 20 g of a polymer resin was prepared, and the rest of the manufacturing process was the same as in Comparative Example 1.

As Comparative Example 3, 30 g of a polymer resin was prepared, and the rest of the manufacturing process was the same as in Comparative Example 1.

As Comparative Example 4, 60 g of a polymer resin was prepared, and the rest of the manufacturing process was the same as in Experimental Example 1.

As Comparative Example 5, 70 g of a polymer resin was prepared, and the rest of the manufacturing process was the same as in Experimental Example 1.

polymer resin content BET surface area (m2/g) 10g 1.3121 20g 1.4119 30g 1.4589 40g 15.188 50g 19.829 60g 20.129 70g 20.539

To measure the specific surface area of the separation membrane, the sample was pretreated at 200° C. for 8 hours, N2 was used as an adsorption gas, and analyzed, and the results are summarized in Table 1.

That is, Experimental Examples 1 to 2 showed a very large specific surface area value than that of Comparative Examples 1 to 3, and Comparative Examples 4 to 5 did not seem to have much difference in specific surface area value, so in the case of Experimental Examples 1 and 2, It is considered that the size of the pores is formed smaller than those of Comparative Examples 1 to 3.

In particular, in the case of Comparative Examples 4 to 5, the same manufacturing method as in Experimental Examples 1 and 2 was adopted, and only the content of the polymer resin was increased, and when the content of the polymer resin exceeded the range of 40 g to 50 g, the effect was Since it did not rise significantly, it was found that the most optimal range was 40 g to 50 g of the polymer resin.

In order to analyze the mechanical properties of the separator, it was measured according to ASTM D882 conditions and measured at a distance of 50 mm between grips using a universal testing machine at a speed of 125 mm/min, and the results are summarized in Table 3.

polymer resin content Load at break (N) Tensile strength (N/mm2) 10g 7.3921 0.4712 20g 6.4839 0.5139 30g 6.2839 0.8273 40g 2.2118 4.3729 50g 1.3118 5.7889 60g 1.1271 5.8448 70g 1.1101 5.9119

Experimental Examples 1 to 2 have a much higher tensile strength (0.8 N/mm 2 or more) than Comparative Examples 1 to 3, and Comparative Examples 4 to 5 show no significant difference in tensile strength values.

In particular, in the case of Comparative Examples 4 to 5, the same manufacturing method as in Experimental Examples 1 and 2 was adopted, and only the content of the polymer resin was increased, and when the content of the polymer resin exceeded the range of 40 g to 50 g, the effect was Since it did not rise significantly, it was found that the most optimal range was 40 g to 50 g of the polymer resin.

As described above, the basic performance and life test were conducted to understand the effect of the present invention.

A conventional product to be described later refers to a product manufactured using a separator used in a lead-acid battery (BX80) manufactured by the applicant, and an improved product is a product containing a separator prepared by the manufacturing method of Experimental Example 1 of the present invention say

In addition, conventional products and improved products with a final 70Ah capacity (20 hour rate capacity) were produced through subsequent processes such as assembly and chemical conversion to give electrical conductivity to the substrate. proceeded.

1) CA: Charge Acceptance test

After discharging the fully charged sample at room temperature (25±2℃) with a 5-hour rate current (17.5A based on 70Ah) for 2.5 hours, leave it at 0±2℃ for more than 12 hours.

After that, charge it with 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 increased the current by about 33% in about 10 minutes compared to the conventional product due to high battery conductivity and charging efficiency.

division hour conventional products improvement




chargeability 1 min 16.25 23.17 2 minutes 14.21 18.22 3 minutes 13.14 17.82 4 minutes 13.10 17.36 5 minutes 13.05 17.55 6 minutes 12.95 17.34 7 minutes 12.74 17.22 8 minutes 12.68 17.11 9 minutes 12.55 16.37 10 minutes 12.5 16.63

As described above, it can be seen that the improved product has better filling importability than that of the conventional product, which is predicted as a result of improving the mechanical strength of the contact part of the pole plate edge, and through this, high output and life expectancy can be improved. This is to improve the basic performance and lifespan of the battery.

2) Accelerated life test (SAE J2801)

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

After performing 34 cycles, discharge at 200A for 10 seconds, and if 7.2V or higher is maintained, perform the life test in such a way that the cycle is repeated 34 times.

Also, the test is stopped when the charging current rises more than 15A or the discharge voltage falls below 12.0V during the cycle.

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

cycle Comparative Example 1 Comparative Example 2 Comparative Example 3 Experimental Example 1 Comparative Example 4 34 11.82 11.83 11.85 11.87 11.89 68 11.76 11.77 11.80 11.83 11.87 102 11.72 11.73 11.78 11.80 11.84 136 11.69 11.71 11.76 11.79 11.82 170 11.65 11.68 11.74 11.77 11.80 204 11.55 11.61 11.69 11.70 11.76 238 11.43 11.45 11.60 11.63 11.70 272 7.2 or less 7.2 or less 11.49 11.55 11.65 306 7.2 or less 11.48 11.56 340 11.40 11.45 374 11.31 11.35 408 7.2 or less 7.2 or less

As shown in Table 4, the lifespan of Comparative Example 1 and Comparative Example 2 is 238 cycles, but the lifespan of Comparative Example 3 is 272 cycles, and the lifespan of Experimental Example 1 is 374 cycles. there has been

However, it can be seen that the life of Comparative Example 4 does not increase further at 374 cycles. Accordingly, the most optimal range among 40 to 50 parts by weight of the polymer resin is 40 parts by weight, so it is preferable to add it within the above optimal range. do.

It is seen that the short circuit phenomenon is improved as the mechanical strength is excellent.

That is, it can be seen that by showing a 57% improvement effect in lifespan compared to the conventional product, it has a positive effect on the lifespan increase.

Through the manufacturing method as described above, it is possible to provide the effect of improving the mechanical strength of the electrode plate edge contact portion so that a hole is not easily formed in the separator even in various electrode plate edge defects.

Those skilled in the art to which the present invention of the above contents pertain will be able to understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all aspects and not restrictive.

S100: Preparation step of the mixture for the central part of the separator
S200: Preparation step of the mixture for the edge of the separator
S300: mixture input step
S400: Simultaneous extrusion membrane manufacturing step

Claims (4)

In the method for manufacturing a lead-acid battery separator reinforced with an electrode plate edge contact,
In the lead-acid battery separator manufacturing process,
A mixture preparation step (S100) for the central part of the separator to prepare a mixture for the central part of the separator in which 10 to 30 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer are mixed; and
40 to 50 parts by weight of a polymer resin, 30 to 40 parts by weight of an inorganic filler, and 30 to 60 parts by weight of a plasticizer to prepare a mixture for edges of a mixture manufacturing step (S200) for the edge of the separator; and
A mixture input step (S300) for putting the mixture for the central part of the separator into the extruder for the central part, and injecting the mixture for the edge into the extruder for the edge (S300); and
Simultaneous extrusion separation membrane manufacturing step (S400) for performing simultaneous extrusion by providing a mixture for the center portion and an edge mixture to the center portion and the edge through each extruder nozzle formed in the extruder for the center portion and the extruder for the edge portion (S400) ; A lead-acid battery separator manufacturing method comprising a reinforced electrode plate edge contact portion.
The method of claim 1,
The contact portion of the separator in contact with the edge of the electrode plate,
A method for manufacturing a lead-acid battery separator reinforced with an edge contact portion of an electrode plate, characterized in that the rib spacing is formed to be less than 0.5 mm.
The method of claim 1,
Through the simultaneous extrusion membrane manufacturing step (S400),
A method for manufacturing a lead-acid battery separator with a reinforced electrode plate edge contact portion, characterized in that the contact portion in contact with the electrode plate edge of the manufactured separator improves mechanical strength.
By the manufacturing method of claim 1,
A lead-acid battery containing an electrode plate for a lead-acid battery to which a lead-acid battery separator with reinforced lead-acid battery contact parts is applied.

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