KR890003931B1 - Pb-battery and fabrication - Google Patents

Abstract

The enclosed lead storage battery comprises an electrode plate assembly consisting of a positive plate, negative plate, separator and electrolyte held in position by the electrode plate assembly and jacket (12) made from laminate film or sheet fabricated by disposing a polyolefin film on the inside in contact with the electrode plate assembly and accumulating thermoplastic synthetic resin two layers at least on the ouside of polyocefin film. The batteries are suitable for automated production and useful for powering potable electric devices.

Description

Sealed Lead Acid Battery and Manufacturing Method Thereof

1 is a system diagram showing a method for manufacturing an electrode column used in a sealed lead acid battery according to the present invention.

2 is a perspective view of a completed electrode column.

3 is a perspective view of an electrode plate assembly to which these electrode lines are welded.

4 is a perspective view of a completed sealed lead acid battery having an electrode plate group covered with a jacket.

The present invention relates to a sealed lead acid battery manufacturing method that can be used as a power source for a portable electric device. This invention relates especially to the jacket surrounding an electrode plate group, and the improvement of the electrode column which protruded from this jacket. Sealed lead acid batteries are widely used as portable power sources because they do not overflow the electrolytic cell because the glass mat, which is a separator, holds the electrolyte.

In a conventional sealed lead acid battery, an electrode plate group consisting of a positive electrode plate, a negative electrode plate, and a separator is inserted into a box-shaped case made of a synthetic resin material such as ABS resin (acrylonitrile-butadiene-styrene resin), and a lid is adhered to the upper part of the case. Or it is a structure sealed by welding. However, in the conventional sealed lead-acid battery, the shape and size of the battery case inevitably change depending on the battery bolt and capacity due to the above structure, so that the product battery has a variety of shapes and sizes, making it difficult to mass produce such a battery at a low price. there was.

In addition, the manufacturing process includes many steps that are difficult to mechanically operate, such as inserting the case of the electrode plate group, joining the lid and the case, and attaching the safety valve, which causes the productivity of these batteries to be low and consequently increase the production cost. As a solution to this problem, Japanese Patent Laid-Open Publication No. 84-207558 discloses a battery case that surrounds an electrode plate group as a film or sheet-like synthetic resin having heat dissipation, such as polyethylene, and seals the electrode column or around the electrode plate by thermal welding. At the same time, a method of forming a safety valve has also been proposed.

However, such film- or sheet-type resins are difficult to meet the properties required for batteries such as water permeability, oxygen permeability, acid resistance tensile strength, bursting strength, etc., and thus have been a major obstacle in commercializing these types of batteries. Moreover, in the battery having such a structure, it is necessary for each electrode column to be thermally welded to a film-like or sheet-type synthetic resin constituting the jacket surrounding the electrode plate group so as to achieve high reliability for adhesion, so that the tip of the electrode column protrudes out of the jacket.

For such high reliability adhesion, thin ribbon or rod electrodes need to be covered with polyethylene or polypropylene resin that can be thermally welded to the jacket, but there is still a way to commercialize these electrodes at low prices. There was no until.

Even if the surface of the electrode is directly coated with polyethylene or polypropylene synthetic resin, strong adhesion between the lead or lead alloy and the resin coating layer is not obtained, and the electrolyte penetrates into the adhesive zone between the base layer electrode main material and the synthetic resin. In addition, there has been another serious problem to overcome in maintaining the commercial reliability of this type of battery.

The first object of the present invention is to place a heat-sealing polyolefin film on the inside of the jacket that is in contact with the electrode plate group, and the other side is laminated by laminating a laminated film or sheet of synthetic resin prepared by laminating films or nets of various synthetic resins To meet the characteristics required for a lead acid battery jacket.

A second object of the present invention is to improve the synthetic resin coating attached on the electrode column to heat weld the coating film or sheet of the synthetic resin forming the electrode column and the outer jacket, and to achieve high reliability welding.

The third object of the present invention is to easily surround the electrode plate group at low cost regardless of the size and size by thermally welding the peripheral portions of the laminated film or sheet of the synthetic resin surrounding the electrode plate group.

A fourth object of the present invention is to provide a sealed lead acid battery that can be manufactured on a commercial scale with easy operation and automation in the manufacturing step.

Other objects of the present invention will become apparent from the following detailed description of the present invention.

The present invention provides an electrode plate group consisting of a positive electrode plate, a negative electrode plate, and a separator, an electrode solution made of dilute sulfuric acid and held in place by these electrode plate groups, and placing the polyolefin film on a surface in contact with the electrode plate group. The present invention relates to a sealed lead acid battery characterized by enclosing a jacket made by laminating a thermoplastic synthetic resin such as polyethylene, tephthalate, polypropylene, nylon and the like, and adhering the jacket around the electrode plate group to each other. will be.

At the time of forming the jacket, a polyolefin film is preferable as the film disposed on the deepest surface of the electrode plate group because of the excellent heat welding property and acid resistance of these films. In addition, the barrier layer provided on the outside of the film is oxygen permeable 20 cc / m ² . 24 hours air pressure or less and water permeability 10 g / m ² . It is preferred to make thermoplastic synthetic resins having 24 hours or less. Of course, such a barrier layer is suitable for the purpose as long as it satisfies the required characteristics as the whole marinate film or sheet.

Examples of polyolefin resins that can be used for this purpose include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene and ethylene-vinylacetate copolymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, ethylene- Acrylic copolymers, ethylene-methacrylate ester copolymers, ethylene-propylene copolymers, as well as terpolymers thereof.

Such polymers or copolymers may be modified by graft polymerization as unsaturated carboxylic acids or anhydrides of such unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, maleic anhydride, citraconic acid, citraconic anhydride, itaconic acid, itaconic anhydride, and the like. have.

Ionomers cross-linked with metal ions such as sodium ions Na ⁺ and zinc ions Zn ⁺⁺ may be used as unsaturated carboxylic acids having a carboxyl group.

The barrier layer used in the present invention is prepared by laminating a polyvinylidene chloride (PVDC) film on another film, or by coating the PVDC film with a polyester film, polypropylene film, polyamide film or the like. It can be embodied as a bovine K-coated film. Such barrier layers can also be prepared by laminating polyvinyl alcohol, saponified ethylene vinyl acetate copolymers, polyacrylonitrile and copolymers thereof, or polyvinylchloride. These films may be multi-layered to reinforce the physical strength of the entire laminate film.

In addition, laminating mesh fabrics made of polyolefin or polyester stretch yarns is very effective for greatly increasing the mechanical or tensile strength. Lamination of the film or sheet may be carried out according to a known method such as dry lamination, extrusion lamination, etc. using urethane resin, polyester resin, ethylene-vinylacetate copolymer resin or the like as an adhesive. The dry lamination method is preferable from the viewpoint of the content, resistance, adhesiveness and the like of the olefin film used as the deepest layer.

Laminate films obtained by combining various types of suitable films may have sufficient toughness and burst strength, but these physical strengths may be further improved significantly by bonding a mesh fabric to these laminates.

Such a laminate film may be simply used as it is in the form of water, but the polyolefin film layer may be further applied to the stock price to form a double wall or triple wall pocket structure. In the latter case, the laminate could improve the pin-hole resistance at bending. The bag structure obtained also has excellent flexibility and can prevent the risk of electrolyte leakage due to bag rupture.

In addition, by cutting one or more films or sheets in a form similar to the electrode plate group, it is possible to make the size of the battery smaller. Such cutting can be carried out in a well-established way, such as vacuum foundation, weaving pneumatic altar, pneumatic altar, progressive assist foundation, cold compression, etc.

The film- or sheet-type synthetic resin used for the jacket prevents the increase of self-defense before the oxygen permeation in the air, while preventing the decrease of the battery life due to moisture infiltration or the evaporation of the electrolyte, and the self-discharge using the battery If this is not done, it requires the ability to keep the inside of the battery under reduced pressure by releasing a small amount of hydrogen gas generated for other reasons. Such synthetic resins also need to have sufficient rupture and tensile strength to withstand battery internal pressure variations, acid resistance and heat adhesive properties to withstand dilute sulfuric acid in the electrolyte.

Electrode column in the battery of the present invention, the body is made of lead or lead alloy, a part of the body is covered with epoxy resin layer having excellent adhesion to the lead or lead alloy, the layer can be further heat-welded with a jacket It is characterized by coating with a polyolefin synthetic resin molding layer. In particular, such electrode lines are manufactured according to the following method. A portion of the lead or lead alloy continuous sheet is coated with an epoxy resin having good adhesion in the form of a bend around the sheet and cured as a heating device or other device.

A polyolefin synthetic resin (polyethylene, a copolymer acid-modified to an ethylene content of 50 mol% or more, polypropylene or an acid-modified propylene copolymer) having excellent heat welding properties is injected into the epoxy resin band by injection molding. Subsequently, the lead or lead alloy sheet is cut to a specific length to produce the required electrode lines. Two such electrode lines are welded to the positive electrode plate and the negative electrode plate in the electrode plate group, respectively, and heated to the polyolefin film of the jacket surrounding the electrode plate group. By welding, the tip of each electrode column protruding out of the jacket can be adhered to the jacket main surface.

Bisphenol A type epoxy resin is generally used as this epoxy resin, but other types of epoxy resins can also be used. Thermosetting epoxy resins containing epoxy curing agents having active hydrogens such as amines, phenols, polyamides, acid anhydrides and the like may also be used.

Epoxy resins that are liquid at room temperature or are solvent soluble and can be dry cured are easy to handle. Epoxy resin coating thickness is 0.1-10 m micrometer, Preferably it is 1-20 micrometers. Appropriate methods such as brush coating, impregnated roll coating, hemp coating, military coating and the like may be used to apply the entire surface or a portion of the sheet-type lead or lead alloy electrode column.

Considering welding, it is preferable to perform partial coating. Such coated surface of epoxy resin can roughen the surface of the mat to increase the adhesion to the polyolefin resin. In addition, inorganic fillers such as glass powder or SiO ₂ powder may be added to improve acid resistance. Polyethylene (hereinafter referred to as PE) and polypropylene (hereinafter referred to as PP) are mentioned as the basic resins of polyolefin type acid-modified synthetic resins. Examples of these resins include these polymers such as low density PE medium density, high density PE, linear low density PE, PP and ethylene-propylene copolymers, ethylene-acrylic ester copolymers, ethylene-methacrylate ester copolymers, all of which are May be used alone or in combination in the present invention.

As such modified materials for acid-modified resins, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, citraconic acid, ciconic anhydride, itaconic acid, itaconic anhydride, and the like may be used. have. The content of such a variant in the acid-modified resin is preferably in the range of 0.01 to 5% by weight.

Various methods such as injection molding, electrostatic coating, fluid impregnation coating and the like can be used for molding polyolefin resin. Insert injection molding is a method of extremely high dimensional accuracy and high efficiency.

EXAMPLE

The present invention may be described in more detail according to the following examples, but it should be noted that the scope of the present invention is not limited only to these examples. As shown in FIG. 1, a lead alloy sheet 1, such as a sheet-like lead wound on a coil, or a lead-tin alloy, is continuously supplied to a line, which is primarily passed through the end treatment step 2, The sheet 1 performs an organic solvent washing such as alcohol or trichloroethylene, a pickling parker treatment and the like. After drying, these sheets are subjected to the epoxy resin coating step (3), and the band-shaped epoxy resin is applied to the sheet circumference at a predetermined thickness, and then cured at a high temperature of 100 to 200 ° C in the next curing step (4). The polyolefin counting paper may be subjected to mold treatment after the epoxy resin gelation reaction, and the gelling epoxy resin may be heat-cured after the mold treatment of the polyolefin resin. Hot air heating, infrared heating, high frequency heating or other suitable methods may be used for heat curing of the epoxy resin. After curing the epoxy resin coated on the lead sheet type, a polyolefin-based resin having excellent adhesion to the epoxy resin, for example, an acid-modified polyethylene (8) was coated with an injection molding machine (5), and then injected onto the epoxy resin. Let's do it. This molded product is then cut into constant lengths with a cutter 6 to obtain the required electrode column as shown in FIG.

The electrode column 7 thus manufactured by molding the polyethylene resin layer 8 is a U-type or inverted-U type separator composed of glass fibers as shown in FIG. 3 by arc welding or the like. The positive electrode plate 9 wrapped with 10) and the pair of negative electrode plates 11 disposed on both sides of the positive electrode plate 9 are welded by arc welding or the like.

The reduced electrode plate group is housed in a jacket 12 made of various synthetic resins as shown in FIG. 1, and then the main surface portion of the jacket 12 is wound in a film-bonded state to act as a safety valve 13. By heat-welding, except for the portion to be made, it is possible to complete a sealed lead acid battery having a structure as shown in FIG.

The manufactured sealed lead acid batteries all have specifications of 2V and 2Ah (dimensions 150mm wide, 75mm high, 15mm thick, 450g in weight), and each of these batteries was subjected to airflow at 60 ° C and 20% relative humidity for 4 weeks. After storage, the residual electric capacity (%) after self-discharge according to oxygen transmission through the jacket and the weight loss (%) of the battery due to moisture transmission were measured and the measurement results are listed in the first table.

TABLE 1

Regarding the jacket in Table 1, (1) is the conventional ABS resin cell mentioned above, (2) is a single film of medium density polyethylene (MDPE) having a thickness of 200 mu, and (3) is an electrode plate group contact. It is a laminate of 12μ thick polyethylene terephthalate (PET) with excellent tensile and burst strength used inside. These are all comparative examples.

(4)-(17) in Table 1 is an Example of this invention. (4) is laminated in the order of 80μ thick MDPE, 40μ thick polyvinylidene chloride (PVDC) and 12μ thick PET from the inside for the purpose of increasing the strength of the laminate film 3 and reducing oxygen permeability and water permeability. It is a laminate film produced by making.

(5) shows 30 μ thick coaxially oriented polypropylene (OPP) on 80 μ thick heat-adhesive molded polypropylene (CPP) for the purpose of further increasing the strength of the laminate film 4 and further reducing oxygen permeability and water permeability. It is a laminate film produced by laminating 15μ thick PVDC-coated PET.

(6) is a film having high strength and excellent heat welding properties at low temperatures made by laminating 15μ thick PET and 23μ thick PVDC-coated OPP on an 80μ thick ethylene-acrylic acid copolymer (EAA).

(7) is a laminate film which is coated with a PVDC coating on both PET and OPP layers on the outside of MDPE in order to further increase the oxygen permeability and water permeability of films 5 and 6.

(8) is a film prepared by laminating 20 micron-thick biaxial culture nylon (ON) between OPP and MIPE film to increase film strength.

(9) superimposes 30 size PET fiber nets on 80-layer linear low density polyethylene (LLDPE) with higher strength than LDPE for the purpose of improving the bending strength and tensile strength and at the same time increasing the bursting strength. In addition, the film was prepared by laminating 15μ thick PVDC-coated PET.

(10) is a film prepared by laminating 20μ thick polyvinyl alcohol (PVA) and 20μ thick OOP on a 100μ thick ethylene-vinylacetate copolymer for the purpose of reducing oxygen permeability.

(11) is a film produced by laminating 15μ thick saponified EVA and 12μ thick PET on 150μ thick LDPE for the purpose of reducing oxygen permeability.

(12) is a film produced by laminating 15μ thick PVA and 20μ thick OPP on both sides of which are coated with 3μ thick PVDC on a 120μ thick MDPE.

(13) inserts a 30μ-thick Barex (acrylonitrile-methacrylic acid copolymer manufactured by Victron Co., Ltd., USA) between 80μ-thick LLDPE and intervening for the purpose of improving toughness and formability. It is a film produced by laminating 30μ thick polybutylene terephthalate (PBT).

(14) is a film prepared by laminating 30μ thick PVDC-coated CPP and 12μ thick PET on a 120μ thick ethylene-methyl methacrylate copolymer (EMMA) for the purpose of enhancing toughness, low temperature adhesive properties and flexibility.

(15) is a film prepared by laminating 30μ thick biaxially oriented polyethylene (OPE) and 15μ thick PVDC-coated PET on a 120μ thick ionomer.

(16) is a double-walled bag structure film made by stacking a 15μ thick PVDC-coated ON and a 20μ thick OPP on a 40μ thick MDPE and bonding a 40μ thick MDPE bag inside the laminate film.

(17) shows the PVDC coated surface in contact with 12μ thick biaxially-polyester PET coated with 3μ thick PVDC on 80μ thick EAA so that the production film can have high strength, low oxygen permeability, moisture permeability and excellent heat welding at low temperature. It is a laminate film laminated | stacked so that it may be manufactured.

Tensile strength of each jacket in Table 1 was measured according to JIS Z-1702, bursting strength to JIS P-8112, moisture permeability to JIS Z-0208 and oxygen permeability ASTM D-1434-58. As can be seen from Table 1, the laminate film prepared by laminating two or three layers of PET PP or nylon on a PE film has a tensile strength of 2 to 5 times compared to the conventional PE single film indicated by (2), In addition, the bursting strength was increased by 3 to 8 times. In particular, the lamination film prepared by combining PET fiber network was able to obtain an effect of 5 to 10 times the tensile strength, 10 to 15 times the bursting strength.

Also, by coating PET or PP with PVDC, the oxygen permeability was reduced to 1/100 to 1/200 of the preceding film made of PE alone, and the moisture permeability was also reduced to about 1/2 of the preceding PE film. Better results were obtained with the resins used for the batteries.

In addition, the residual capacity and mass loss of sealed lead-acid batteries manufactured using these individual films when measured after 4 weeks at 60 ° C ambient temperature and 20% relative humidity are almost proportional to oxygen permeability and water permeability of these films. As can be seen from Table 1, the jacket of the present invention can maintain 30 to 50% more capacity than the conventional film made of PE alone, and the weight loss of the battery is also less than about 2/3. It was only. Even when compared with an ABS resin cell, the storage battery according to the present invention was able to maintain 10 to 20% more capacity and reduced weight by less than about 1/2.

The electrode column in the storage battery produced using the jackets listed in Table 1 was prepared by forming a band-shaped acid-modified polyethylene resin coating on the epoxy resin layer. Similar electrode stocks were prepared by varying the shape of the coated resin. After supplying the electrolyte in advance, the batteries were first discharged at 1.5A for 20 hours, and the batteries were left at 60 ° C for 4 hours. Subsequently, the degree (length) of the penetration of the electrolyte into each electrode line was observed, and the results are shown in Table 2.

TABLE 2

Electrode major number 1 was first degreased the basic agent with ethyl alcohol and coated with polyethylene according to the injection molding.

Electrode Note 2 is an electrode note coated with polypropylene in the same manner as in Comparative Example 1. Electrode Note No. 3 is an electrode note prepared by coating the base material with an acid-modified polyethylene having better heat adhesion to metal instead of polyethylene according to the same method as in Electron Note Nos. 1 and 2 above.

Electrode Note 4 is an electrode note coated with an ethylene-acrylic acid copolymer having better heat welding properties and higher strength for metals than acid-modified polyethylene according to the same method as in Electrode Note Nos. 1 to 3. Electrode No. 5 is coated with a degreasing base material with an epoxy resin having excellent adhesion to metals, and the resin film is heat-cured at 150 ° C. for 10 minutes and further acid-modified having excellent heat melting property with respect to epoxy resins. An electrode pole produced by coating a polyethylene resin according to an injection molding method.

Electrode pole No. 6 covers the degreased base material as a commonly known silane binder which has the effect of further enhancing the adhesion between metal and epoxy resin, and the epoxy resin is coated thereon to cure it and acid-modified thereon. Electrode column obtained by injecting polyethylene by injection molding method. Electrode note 7 is an electrode note prepared by injecting onto an epoxy-coated ethylene acrylic ester copolymer having better friability adhesion properties and higher strength for metals than acid-modified polyethylene used in electrode note 5. Epoxy resin coating may be carried out after precoating with diluting solution of polyester, acrylic, crosslinked nylon or other type of resin.

As can be seen from Table 1, even when the electrode column is coated with polyethylene or its acid-modified resin or copolymer or polypropylene, the electrolyte starts to penetrate into the electrode line, for example, the anode or the cathode during the initial discharge period, When these electrode poles are left at 60 DEG C, electrolyte leakage occurs.

Therefore, in this case, it is difficult to bond the electrode main part. However, when the epoxy resin coating is coated under the heat-adhesive resin layer, even if the battery is left at 60 ° C. for 4 weeks, electrolyte penetration hardly occurs and thus electrolyte leakage can be prevented. This leak-tightening effect was increased when the epoxy resin adhesion was increased by using silane or titanium binder. The binder may be coated by coating the epoxy resin layer with a binder dilution solution according to a suitable method such as impregnation, brush coating, spray coating, etc. and then drying the coating or impregnating the epoxy resin layer with the binder.

As described above, a laminate in which a PET film, a PP film, a nylon film, or a PE or PET fiber network is laminated on the outside of a polyolefin (polymethylene, etc.) having excellent heat welding properties has a tensile strength and a rupture as compared with the previous film of PE alone. The strength was greatly improved, and as a result, the reliability of the sealed lead acid battery was improved. In addition, by laminating PVDC-coated film of PP or PET or PVA, saponified EVA, polyacrylonitrile or its copolymer film on the polyolefin film, oxygen permeability and water permeability are greatly reduced, thereby preventing self-discharge caused by oxygen infiltration. It can be minimized.

In addition, it is possible to prevent the reduction of the battery capacity and lifespan caused by the decrease of the electrolyte solution due to the penetration of water and evaporation. In addition, by configuring the epoxy resin layer and the polyolefin resin layer in the form of a laminate at the adhesive portion of the electrode line, it is possible to prevent the leakage of the electrolyte along the electrode line, thereby greatly increasing the reliability of the electrode line adhesion by the heat welding.

Claims (13)

A sealed lead-acid battery in which an electrode plate group consisting of a positive electrode plate, a negative electrode plate, and a separator, and an electrolyte solution in a normal position by the electrode plate group are surrounded by a jacket made of a film or sheet-type synthetic resin body, wherein the polyolefin film is in contact with the electrode plate group. And arranging two or more thermoplastic synthetic resin films on the outside thereof to form a jacket with a laminate film or sheet prepared by stacking two or more thermoplastic synthetic resin films. The method of claim 1, wherein the laminate film or sheet forming the jacket is oxygen-permeable 20 cc / m ² . Sealed lead acid battery of 24 hours. At or below atmospheric pressure and having a water permeability of 10 g / m ² .24 hours or less. The sealed lead acid battery according to claim 1, wherein the polyolefin film inside the jacket and the thermoplastic synthetic resin film outside the jacket are laminated by a dry lamination method. The film laminated on the outer side of the polyolefin film of the jacket is polyethylene terephthalate (polyester), polypropylene, nylon (polyamide), polyvinyl alcohol, saponified ethylene-vinylacetate copolymer, polyvinyl chloride, poly A sealed lead acid battery made of a material selected from the group consisting of butylene terephthalate and copolymers thereof. The sealed lead acid battery according to claim 1, comprising at least one laminate film or sheet layer forming a jacket by bonding a film coated with polyvinylidene chloride or laminated with a polyvinylidene chloride film. The sealed lead acid battery according to claim 1, wherein at least one laminate film or sheet layer is formed to bond the synthetic resin fiber network to form a jacket. The sealed lead acid battery according to claim 1, wherein the sealed lead acid battery has a double- or triple-wall bag structure manufactured by superposing a polyolefin film inside a synthetic resin laminate film or sheet. The sealed lead acid battery according to claim 1, wherein a polyethylene-ethylene copolymer or an acid-modified resin is placed inside the jacket and a polyethylene terephthalate film coated with polyvinylidene chloride is laminated by dry lamination. . In a sealed lead acid battery composed of an electrode plate group composed of a positive electrode plate, a negative electrode plate, and a separator, an electrolyte solution in a normal position by the electrode plate group, and a jacket made of film or sheet-type synthetic resin, the electrode column is connected to the positive electrode plate and the negative electrode plate, respectively. In addition, a polyolefin resin layer is formed on the epoxy resin layer formed on at least a portion of the main surface of these electrodes, a polyolefin film is disposed inside the jacket in contact with the electrode plate group, and two or more layers of a thermoplastic resin film are disposed on the outside thereof. It is formed by laminating and heat-welding on all the main surfaces around the electrode plate group except for the part which serves as a safety valve by simply leaving the jacket in film-film state without heat-gluing. Characterized by heating and welding a jacket on a polyolefin resin on each electrode column for Waste type lead acid battery. The polyolefin resin layer according to claim 9, wherein the polyolefin resin layer formed on the electrode column is made of a material selected from the group consisting of polyethylene, ethylene copolymer or acid-modified resin thereof, polypropylene, propylene copolymer or acid-modified resin thereof. A sealed lead acid battery in which a resin layer is formed in a band form on an epoxy resin layer by a molding method. The sealed lead acid battery according to claim 9, wherein the surface of the epoxy resin layer formed on the electrode is roughened as in the mat. The sealed lead acid battery according to claim 10, wherein the polyolefin resin layer is formed in a band shape on the epoxy resin layer by an injection molding method. A portion of the continuous sheet-like lead or lead alloy is covered with a band of epoxy synthetic resin in a band form, and after the resin coating is cured, a heat-welding polyolefin synthetic resin layer is formed on the upper portion by the injection molding method. An electrode column is prepared by cutting to a predetermined length, and the electrode column is welded to the positive electrode plate and the negative electrode plate of the electrode plate group, respectively, and the electrode plate group is accommodated in a jacket made of a laminate resin film or sheet having the polyolefin film located inside. Except for the part that serves as a safety valve by leaving the film-film adhesive state without heat welding, the main surface of the jacket around the electrode plate is heated and welded, and the jacket is placed on a polyolefin resin molded body on each electrode. Sealed lead consisting of a process of heating and welding so that the tip protrudes out of the jacket A method of manufacturing a battery.

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