JPH07254408A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent drop-out of active material, and achieve high energy density and long service life by filling the active material in a number of through holes provded in acid-resistant and oxidation-resistant resin sheets laminated on both surfaces of a metal sheet as a collector for a positive electrode. CONSTITUTION:On both surface of a metal sheet 2 0.1mm thick comprising lead alloy, a resin sheet 0.2mm thick comprising polyolefine-based synthetic resin in which a number of through holes 31 are formed is bound by binding agent. The holes 31 are 2.7mm in diameter and circular, they are distributed uniformly at an aperture ratio of 62%, and active material is filled in the holes 31 for composing a positive electrode 1 8cm wide and 12cm long. The positive electrode 1, a separator of micro-fibers of glass 0.55mm thickness, and a paste type negative electrode 35mm thick are made as a set, and 19 sets are connected to each other by the same poles to compose one cell. Six cells are series connected and contained in a case, and electrolyte is injected to compose a battery of 24Ah, 12V. Drop-out of the active material is thus prevented, a reaction surface area is large, and a battery of a long service life and a high energy density can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive electrode of a lead acid battery, especially a sealed lead acid battery.

[0002]

2. Description of the Related Art Conventionally, lead-acid battery electrodes are roughly classified into two types: a tubular (clad) type and a paste type. The tubular type has a structure composed of a core metal made of a lead alloy, a cylindrical tube formed by knitting glass fiber having corrosion resistance, and an active material held by the tube, and is mainly used for a positive electrode of a long-life battery. Was used. The paste type has a plate-like structure in which an active material is held in a lead alloy lattice, and is mainly used for a negative electrode and a positive electrode of a low-cost battery excellent in high rate discharge characteristics. .

By the way, in recent years, a sealed lead acid battery has been remarkably required to have a high energy density and a long life. However, in the above-mentioned type of electrode, there is a limit in achieving both high energy density and long life, so that the above requirement cannot be sufficiently satisfied. That is, in the tubular type electrode, since the active material is held by the cylindrical tube made by knitting glass fiber, the active material is prevented from falling off even if the core metal is corroded, and thus the life is long. Since the reaction area of the electrode is not large, the high rate discharge characteristic is low, and therefore a high energy density cannot be obtained. In the case of a paste type electrode, the thin plate shape increases the reaction area of the electrode, so the high rate discharge characteristics are high, and therefore a high energy density can be obtained, but if the grid body corrodes and the shape changes, The contact between the body and the active material is no longer maintained, and the active material falls off, so that the life is not long.

[0004]

OBJECTS OF THE INVENTION It is an object of the present invention to provide a lead storage battery having a positive electrode which has a high energy density and a long life.

[0005]

According to a first aspect of the present invention, there is provided a lead storage battery comprising: a positive electrode comprising an acid-resistant and oxidation-resistant resin sheet, a metal sheet for collecting current, and an active material. The resin sheet and the metal sheet are laminated, and at least the resin sheet has a large number of through holes, and the active material is filled in the through holes.

In the lead acid battery of claim 2, all the through holes of the resin sheet have the same diameter and are evenly distributed.

According to a third aspect of the present invention, in the lead acid battery, the through hole of the resin sheet has a diameter of the through hole located in the vicinity of the current collecting ear portion of the metal sheet smaller than the diameter of the through hole located in other portions. Is formed.

In the lead-acid battery according to claim 4, all the through holes of the resin sheet have the same diameter, and the distribution density of the through holes located in the vicinity of the current collecting ear portion of the metal sheet is different. It is formed to be smaller than the distribution density of the through holes located in the part.

In the lead acid battery according to the fifth aspect of the present invention, a large number of through holes are also formed in the metal sheet, and the through holes of the metal sheet communicate with the through holes of the resin sheet, respectively. The diameter is equal to or smaller than the diameter of the through hole of the communicating resin sheet, and the active material is also filled in the through hole of the metal sheet.

According to a sixth aspect of the present invention, in the lead acid battery, the metal sheet is a copper sheet whose surface is coated with lead or a lead alloy.

In the lead acid battery according to the seventh aspect, the resin sheet is provided on one surface of the metal sheet, and the other surface of the metal sheet is resin-coated.

In the lead acid battery according to the eighth aspect, the resin sheet is provided on both sides of the metal sheet.

In the lead acid battery of claim 9, the resin sheet is adhered to the metal sheet.

[0014]

According to the lead storage battery of the first aspect, since the active material is held by the through holes of the resin sheet, even if the metal sheet is corroded, the active material is prevented from falling off. Moreover, the part of the metal sheet covered with the resin sheet is
Since it is difficult to corrode, the metal sheet hardly corrodes. Therefore, there is almost no loss of active material,
It has a long life. In addition, since it is a thin plate-like body formed by laminating a resin sheet and a metal sheet, the reaction area as an electrode is large, and therefore the high rate discharge characteristic is improved and a high energy density is obtained.

According to the lead storage battery of the second aspect, the production is facilitated and the productivity can be improved.

By the way, since the resistance of the metal sheet in the vicinity of the current-collecting ear portion is low, the active material of the resin sheet located in the vicinity of the current-collecting ear easily reacts as compared with the active material in the other portions. Therefore, the portion of the metal sheet near the current collecting ear portion is more likely to be corroded than other portions. For this reason, the current collecting ability of the metal sheet may decrease, and the life of the positive electrode may be exhausted. However, according to the lead storage battery of claim 3, since the diameter of the through hole of the resin sheet located in the vicinity of the current collecting ear portion of the metal sheet is small, the reaction of the active material in the vicinity can be suppressed, Corrosion of the metal sheet near the current collecting ear can be suppressed. Therefore, it is possible to prevent a decrease in the current collecting ability of the metal sheet, and it is possible to further extend the life of the positive electrode. Note that FIG.
FIG. 4 is a diagram showing a relationship between a diameter of a through hole and reactivity of an active material. The horizontal axis is the diameter of the through hole, and the vertical axis is the actual capacity / theoretical capacity x 10
Indicates 0. It can be seen that the reactivity of the active material is low when the diameter of the through hole is small.

According to the lead storage battery of the fourth aspect, similarly to the lead storage battery of the third aspect, the reaction of the active material in the vicinity of the current collecting ear portion is suppressed, and the current collecting ear portion of the metal sheet is suppressed. Corrosion in the vicinity of is suppressed. Therefore, the current collecting ability of the metal sheet is prevented from lowering, and the positive electrode has a longer life.

According to the lead storage battery of the fifth aspect, since the active material is also filled in the through holes of the metal sheet, the amount of the active material per unit volume in the positive electrode becomes large. Therefore, the high rate discharge characteristics are improved, and a higher energy density can be obtained.

By the way, generally, lead or a lead alloy is used as a current collector of an electrode of a lead storage battery. According to the lead-acid battery of claim 6, since copper, which has better conductivity and lighter weight than lead or lead alloy, is used for the metal sheet, that is, the current collector, the high rate discharge characteristic is improved, and further higher performance is achieved. Energy density is obtained.

According to the lead storage battery of the seventh aspect, when the amount of active material is constant, the resin sheet can be thicker than when the resin sheets are provided on both sides of the metal sheet.
Therefore, the time required for the reaction of all the active materials becomes long, and the life becomes longer. Since the other surface of the metal sheet is coated with resin, corrosion is prevented.

According to the lead-acid battery of the eighth aspect, corrosion of both sides of the metal sheet is prevented.

According to the ninth aspect of the lead storage battery, the electrolytic solution is prevented from entering between the resin sheet and the metal sheet, and the metal sheet is surely prevented from being corroded.

[0023]

【Example】

(Embodiment 1) FIG. 2 is a front view of the positive electrode of this embodiment, and FIG. 3 is a transverse sectional view of the same. The positive electrode 1 of this embodiment includes a metal sheet 2, a resin sheet 3, and an active material (not shown). The metal sheet 2 is made of lead alloy and has a thickness of 0.1 mm.
Is. The resin sheet 3 is made of polyolefin synthetic resin and has a thickness of 0.2 mm. The resin sheet 3 is provided on both sides of the metal sheet 2 with an adhesive. A large number of through holes 31 are formed in the resin sheet 3. The through holes 31 have a circular cross section with a diameter of 2.7 mm, and are formed with an open area ratio of 62% and are evenly distributed. The through hole 31 is filled with the active material. The positive electrode 1 has a width of 8 cm and a length of 12 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.55 mm, and a 0.35 mm-thick paste type negative electrode having the same width and length as the positive electrode 1 are set as one set, and 19 sets are provided. The same poles are connected to each other to form one cell, and the six cells are connected in series, housed in an ABS case, injected with an electrolytic solution, and then initially charged.
An Ah, 12V sealed lead acid battery was constructed. The size of this storage battery is 12.8 cm in width and 17.1 c in length.
m, the height was 10.8 cm, and the weight was 5.6 kg.

(Embodiment 2) FIG. 4 is a cross-sectional view of the positive electrode of this embodiment. The front view is the same as FIG. The positive electrode 1 of the present example is different from the positive electrode 1 of Example 1 in that a large number of through holes 21 are formed in the metal sheet 2 and the active material (not shown) is also filled in the through holes 21. The point that it is basically different.

The metal sheet 2 is made of a lead alloy and has a thickness of 0.1 mm. The resin sheet 3 is made of polyolefin synthetic resin and has a thickness of 0.2 mm. The resin sheet 3 is provided on both sides of the metal sheet 2 with an adhesive. A large number of through holes 31 are formed in the resin sheet 3. The through holes 31 have a circular cross section with a diameter of 3.0 mm, and are formed with an open area ratio of 77% and are evenly distributed. The metal sheet 2 also has a large number of through holes 21.
Are formed. The through hole 21 also has a circular cross section with a diameter of 3.0 mm, and the through hole 21 is formed so as to communicate with the through holes 31, respectively. The through hole 31 and the through hole 21 are filled with the active material. Positive electrode 1 has a width of 8
cm, length 12 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.6 mm, and a 0.43 mm-thick paste type negative electrode having the same width and length as the positive electrode 1 are set as one set, and 17 sets are provided. The same poles are connected to each other to form one cell, and the six cells are connected in series and housed in a case made of ABS. After the electrolyte is injected, initial charging is performed to obtain 25A.
A sealed lead acid battery of h and 12V was constructed. The size of this storage battery is 12.8 cm in width and 16.6 cm in length.
The height was 10.8 cm and the weight was 5.5 kg.

(Embodiment 3) FIG. 5 is a cross-sectional view of the positive electrode of this embodiment. The view on arrow II of FIG. 5 is the same as FIG. The positive electrode 1 of this example is basically different from the positive electrode 1 of Example 1 in that the resin sheet 3 is provided only on one surface of the metal sheet 2 and the resin sheet 3 is thick.

The metal sheet 2 is made of lead alloy and has a thickness of 0.1 mm. The resin sheet 3 is made of a polyolefin synthetic resin and has a thickness of 0.4 mm. The resin sheet 3 is provided by adhering only one surface of the metal sheet 2 with an adhesive, and a thin resin coating is applied to the other surface of the metal sheet 2. A large number of through holes 31 are formed in the resin sheet 3. The through hole 31 has a diameter of 2.7.
It has a circular cross section of mm, and has a porosity of 62% and is evenly distributed. The active material (not shown) is
The through holes 31 are filled. The positive electrode 1 has a width of 8 cm and a length of 12 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.55 mm, and a 0.35 mm thick paste type negative electrode having the same width and length as the positive electrode 1 are set as one set, and 19 sets are set. The same poles are connected to each other to form one cell, and the six cells are connected in series and housed in an ABS case. After the electrolyte is injected, initial charging is performed.
An Ah, 12V sealed lead acid battery was constructed. The size of this storage battery is 12.8 cm in width and 17.1 c in length.
m, the height was 10.8 cm, and the weight was 5.7 kg.

(Embodiment 4) FIG. 6 is a cross-sectional view of the positive electrode of this embodiment. The front view is the same as FIG. The positive electrode 1 of this example is basically different from the positive electrode 1 of Example 2 in that the diameter of the through hole 21 formed in the metal sheet 2 is small and the through hole 31 has a square cross section. ing.

The metal sheet 2 is made of a lead alloy and has a thickness of 0.1 mm. The resin sheet 3 is made of polyolefin synthetic resin and has a thickness of 0.2 mm. The resin sheet 3 is provided on both sides of the metal sheet 2 with an adhesive. A large number of through holes 31 are formed in the resin sheet 3. The through holes 31 have a square cross section with a side of 2.4 mm, and are formed with an open area ratio of 62% and are evenly distributed. The metal sheet 2 also has a large number of through holes 2
1 is formed. The through holes 21 have a circular cross section with a diameter of 1.5 mm, and are formed so as to communicate with the through holes 31, respectively. The through hole 31 and the through hole 21 are filled with the active material. The positive electrode 1 has a width of 8 cm and a length of 1.
It is 2 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.55 mm, and a 0.35 mm thick paste type negative electrode having the same width and length as the positive electrode 1 are set as one set, and 19 sets are provided. The same poles are connected to each other to form one cell, and the six cells are connected in series, housed in an ABS case, injected with an electrolytic solution, and then initially charged.
An Ah, 12V sealed lead acid battery was constructed. The size of this storage battery is 12.8 cm in width and 17.1 c in length.
m, the height was 10.8 cm, and the weight was 5.6 kg.

Example 5 The positive electrode 1 of this example has the same basic structure as the positive electrode 1 of Example 1. The metal sheet 2 is
It is made of lead alloy and has a thickness of 0.1 mm. Resin sheet 3
Is made of polyolefin synthetic resin and has a thickness of 0.2 m
m. The resin sheet 3 is provided on both sides of the metal sheet 2 with an adhesive. The resin sheet 3 has
A large number of through holes 31 are formed. The through hole 31 has a circular cross section with a diameter of 3.0 mm and has an opening ratio of 77%.
And evenly distributed. The through hole 31 is filled with the active material. The positive electrode 1 has a width of 8 cm and a length of 1.
It is 2 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.6 mm, and a 0.43 mm-thick paste-type negative electrode having the same width and length as the positive electrode 1 were set as one set, and 17 sets were provided. The same poles are connected to each other to form one cell, and the six cells are connected in series and housed in a case made of ABS. After the electrolyte is injected, initial charging is performed to obtain 25A.
A sealed lead acid battery of h and 12V was constructed. The size of this storage battery is 12.8 cm in width and 16.6 cm in length.
The height was 10.8 cm and the weight was 5.9 kg.

(Embodiment 6) FIG. 7 is an enlarged front partial view of the positive electrode 1 of this embodiment. Reference numeral 11 is an ear portion for collecting electricity. The positive electrode 1 of the present embodiment is different from the positive electrode 1 of the first embodiment in the ear portion 11
The basic difference is that the diameter of the through hole 31 located in the vicinity of is smaller than the diameter of the through hole 31 located in other parts.

The metal sheet 2 is made of a lead alloy and has a thickness of 0.1 mm. The resin sheet 3 is made of ABS synthetic resin and has a thickness of 0.2 mm. The resin sheet 3 is provided on both sides of the metal sheet 2 with an adhesive. A large number of through holes 31 are formed in the resin sheet 3. Among the through holes 31, the through hole 31a located in the vicinity of the ear portion 11 has a circular cross section with a diameter of 2.0 mm, and the through holes 31b of the other parts have a circular cross section with a diameter of 4.0 mm. The through holes 31 are formed with an opening ratio of 77%. The through hole 31 is filled with an active material (not shown). The positive electrode 1 has a width of 8 cm and a length of 12 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.6 mm, and a 0.43 mm thick paste type negative electrode having the same width and length as the positive electrode 1 were set as one set, and 17 sets were provided. The same poles are connected to each other to form one cell, and the six cells are connected in series and housed in a case made of ABS. After the electrolyte is injected, initial charging is performed to obtain 25A.
A sealed lead acid battery of h and 12V was constructed. The size of this storage battery is 12.8 cm in width and 16.6 cm in length.
The height was 10.8 cm and the weight was 5.9 kg.

(Embodiment 7) FIG. 8 is an enlarged front partial view of the positive electrode 1 of this embodiment. Compared with the positive electrode 1 of the first embodiment, the positive electrode 1 of the present embodiment has a distribution density of the through holes 31 located in the vicinity of the ears 11 smaller than that of the through holes 31 located in other parts, The difference is basically that a through hole 21 having a diameter smaller than that of the through hole 31 is formed in the sheet 2.

The metal sheet 2 is made of a lead alloy and has a thickness of 0.1 mm. The resin sheet 3 is made of polyolefin synthetic resin and has a thickness of 0.2 mm. The resin sheet 3 is attached to both surfaces of the metal sheet 2 by heat welding. A large number of through holes 31 are formed in the resin sheet 3. The through hole 31 has a circular cross section with a diameter of 3.0 mm and has an opening ratio of 64% and the distribution density of the through hole 31 located in the vicinity of the ear portion 11 is located in other parts. Is smaller than the distribution density of. A large number of through holes 21 are also formed in the metal sheet 2. The through holes 21 have a circular cross section with a diameter of 1.0 mm and are formed so as to communicate with the through holes 31, respectively. The through hole 31 and the through hole 21 are filled with an active material (not shown). The positive electrode 1 has a width of 8 cm and a length of 1.
It is 2 cm.

The positive electrode 1, a separator made of a fine glass fiber mat and having a thickness of 0.6 mm, and a 0.43 mm thick paste type negative electrode having the same width and length as the positive electrode 1 were set as one set, and 17 sets were provided. The same polarity is connected to each other to form one cell, and 6 cells are connected in series to be housed in a case made of ABS. After the electrolyte is injected, initial charging is performed to obtain 23A.
A sealed lead acid battery of h and 12V was constructed. The size of this storage battery is 12.8 cm in width and 16.6 cm in length.
The height was 10.8 cm and the weight was 5.6 kg.

(Embodiment 8) The positive electrode 1 of this embodiment is the same as the positive electrode 1 of the embodiment 6 except that a metal sheet 2 made of copper coated with a lead alloy is used. Is. In addition, the configured lead-acid battery is 25A
h, 12 V, and weight was 5.5 kg.

(Example 9) The positive electrode 1 of the present example is different from the positive electrode 1 of Example 7 only in that the metal sheet 2 made of copper coated with a lead alloy is used, and the others are the same. Is. In addition, the configured lead-acid battery is 23A
It was h, 12V, and the weight was 5.2 kg.

(Comparative Example 1) A tubular type positive electrode was used to construct an open lead acid battery of 140 Ah, 6V.

Comparative Example 2 A sealed lead acid battery of 24 Ah, 12 V was constructed by using a paste type positive electrode. The thickness of the positive electrode was 1.3 mm.

(Test) The lead-acid batteries prepared in Examples 1 to 9 and Comparative Examples 1 and 2 were examined for discharge energy density and cycle life. Table 1 shows the results. The discharge energy density was calculated from the capacity and the battery weight when discharged at 25 ° C. to a final voltage of 1.75 V / cell at a discharge current of 5 hours. Regarding the cycle life, the discharge is performed at a current of 0.25 C (C is a 5 hour rate capacity) for 3 hours, the charge is performed up to 110% of the discharge amount, and the charge and discharge are repeated at 40 ° C. When the life reached 80%, it was determined as the number of cycles until reaching this life.

[0047]

[Table 1]

The following can be seen from Table 1. Example 1
The reason why the discharge energy density of the storage battery of No. 9 is higher than that of Comparative Example 2 is that the positive electrode of Examples 1 to 9 is considerably thinner than the positive electrode of Comparative Example 2, and thus the reaction area of the positive electrode is large. In the paste type positive electrode of Comparative Example 2, when the thickness of the positive electrode is made thinner than the current state, corrosion of the positive electrode current collector occurs early, resulting in a remarkably short life and impracticality. was there. However, Example 1
~ 9 positive electrode, the metal sheet 2 covered with the resin sheet 3
Since the corrosion of the part is suppressed, the thinning of the positive electrode can be achieved without considering the deterioration of the life characteristics due to the corrosion, and the discharge energy density can be significantly improved.

The cycle life of the storage battery of Example 1 is longer than that of Example 2 because the volume of the metal sheet 2 is large.

The cycle life of the storage battery of Example 3 is higher than that of Examples 1 and 2 because the thickness of the active material is thicker and the time required for the reaction of the active material is longer.

The cycle life of the storage battery of Example 4 is shorter than that of Example 1 because the through-hole 31 has a rectangular shape, so that the stress generated by the volume change of the active material due to charging and discharging is large. It is considered that this is not uniform and the bonds between the active materials are weakened.

The cycle lifes of Examples 6 and 7 are those of Examples 1 to 1.
5 is higher than that of 5 because the reaction of the active material in the vicinity of the ear 11 is suppressed and the corrosion of the metal sheet 2 in the vicinity is suppressed.

The discharge energy densities of Examples 8 and 9 are higher than those of Examples 6 and 7 because the metal sheet 2 is made of copper, which is more conductive and lighter than lead or lead alloy. Is.

In the above embodiment, if the diameter of the through holes 31 is 10 mm or more, the retention of the active material is poor, and if it is 1 mm or less, the distance between the through holes 31 is increased in order to obtain a desired open area ratio. Is less than 0.1 mm, which causes the inconvenience that corrosion of the metal sheet 2 is likely to occur. Therefore, it is preferably 2-3 mm as in the above embodiment.

Further, the metal sheet 2 and the resin sheet 3 are preferably adhered by an adhesive, but a mechanical joining method may be used.

[0056]

According to the lead storage battery of the first aspect, since the active material is held by the through hole 31 of the resin sheet 3, even if the metal sheet 2 is corroded, the active material can be prevented from falling off. Moreover, since the resin sheet 3 and the metal sheet 2 are laminated, it is possible to prevent the portion of the metal sheet 2 covered with the resin sheet 3 from being corroded. Therefore, the active material can be prevented from falling off and the life can be extended. In addition, since it has a thin plate shape in which the resin sheet 3 and the metal sheet 2 are laminated, the reaction area as an electrode can be increased, so that the high rate discharge characteristic can be improved and a high energy density can be obtained.

According to the lead-acid battery of the second aspect, the production is facilitated and the productivity can be improved.

According to the lead-acid battery of claim 3, the ear portion 1
Since the diameter of the through hole 31 located in the vicinity of 1 is small,
The reaction of the active material in the vicinity can be suppressed, and the corrosion in the vicinity of the ear 11 of the metal sheet 2 can be suppressed. Therefore, it is possible to prevent a decrease in the current collecting ability of the metal sheet 2, and
Can have a longer life.

According to the lead storage battery of the fourth aspect, similarly to the lead storage battery of the third aspect, the reaction of the active material in the vicinity of the ear portion 11 can be suppressed, and the vicinity of the ear portion 11 of the metal sheet 2 can be suppressed. The corrosion of can be suppressed. Therefore, it is possible to prevent a decrease in the current collecting ability of the metal sheet 2, and it is possible to further extend the life of the positive electrode 1.

According to the lead-acid battery of the fifth aspect, since the through hole 21 of the metal sheet 2 is also filled with the active material,
The high rate discharge characteristics can be improved, and a higher energy density can be obtained.

According to the lead-acid battery of claim 6, since copper, which has better conductivity and lighter weight than lead or lead alloy, is used for the metal sheet 2, that is, the current collector, high rate discharge characteristics can be improved. ,
A higher energy density can be obtained.

According to the lead-acid battery of the seventh aspect, the resin sheet 3 can be made thicker than the case where the resin sheets 3 are provided on both sides of the metal sheet 2 when the amount of the active material is constant, so that the whole active material can be obtained. The time required for the reaction of the substance can be lengthened and the life can be extended.

According to the lead storage battery of the eighth aspect, it is possible to prevent corrosion of both surfaces of the metal sheet 2.

According to the lead storage battery of the ninth aspect, it is possible to prevent the electrolytic solution from entering between the resin sheet 3 and the metal sheet 2, and to reliably prevent the metal sheet 2 from being corroded.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a diameter of a through hole and reactivity of an active material.

2 is a front view of the positive electrode of Example 1. FIG.

3 is a cross-sectional view of the positive electrode of Example 1. FIG.

FIG. 4 is a cross-sectional view of the positive electrode of Example 2.

5 is a cross-sectional view of the positive electrode of Example 3. FIG.

FIG. 6 is a cross-sectional view of the positive electrode of Example 4.

FIG. 7 is an enlarged front partial view of the positive electrode of Example 6.

8 is an enlarged front partial view of the positive electrode of Example 7. FIG.

[Explanation of symbols]

 1 Positive Electrode 2 Metal Sheet 3 Resin Sheet 11 Ears 21, 31 Through Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Murata 6-6 Josaimachi, Takatsuki City, Osaka Prefecture Yuasa Corporation

Claims (9)

[Claims] 1. A resin sheet having acid resistance and oxidation resistance, a metal sheet for collecting electricity, and a positive electrode made of an active material, wherein the resin sheet and the metal sheet are laminated, and at least the resin sheet is A lead storage battery having a large number of through-holes, wherein the active material is filled in the through-holes. 2. The lead acid battery according to claim 1, wherein all the through holes of the resin sheet have the same diameter and are evenly distributed. 3. The through hole of the resin sheet is formed such that the diameter of the through hole located in the vicinity of the current collecting ear portion of the metal sheet is smaller than the diameter of the through hole located in the other portion. The lead acid battery according to claim 1. 4. The through holes of the resin sheet all have the same diameter, and the distribution density of the through holes located in the vicinity of the current collecting ear portion of the metal sheet is smaller than that of the through holes located in other parts. The lead acid battery according to claim 1, which is formed so as to have a distribution density smaller than that of the lead storage battery. 5. A large number of through holes are also formed in the metal sheet, the through holes of the metal sheet are in communication with the through holes of the resin sheet, and the diameter of the through holes of the metal sheet is the same as that of the resin sheet. The lead acid battery according to claim 1, which has a diameter equal to or smaller than the diameter of the through hole, and the active material is also filled in the through hole of the metal sheet. 6. The lead acid battery according to claim 1, wherein the metal sheet is a copper sheet whose surface is coated with lead or a lead alloy. 7. The lead acid battery according to claim 1, wherein the resin sheet is provided on one surface of the metal sheet, and the other surface of the metal sheet is resin-coated. 8. The lead acid battery according to claim 1, wherein the resin sheet is provided on both sides of the metal sheet. 9. The lead acid battery according to claim 1, wherein the resin sheet is bonded to a metal sheet.