JP2009193835A - Lead-acid battery, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead-acid battery capable of increasing output power, and extending a service life. <P>SOLUTION: This lead-acid battery includes a battery jar with an electrode plate group housed therein. In the electrode plate group, positive electrode plates 1 and negative electrode plates 2 are alternately stacked through separators. The positive electrode plate 1 and the negative electrode plate 2 have each a collector 15. In the collector 15, on one surface side of a powder rolled sheet 11 formed by rolling atomized powder 26 rapidly solidified by spraying a melted body of lead or a lead alloy, a porous layer 12 having density lower than that of the powder rolled sheet 11 is arranged. Positive electrode active material paste 17 and negative electrode active material paste 18 are applied to surfaces of the porous layers 12 formed on the collectors 15 in the positive electrode plate 1 and the negative electrode plate 2, respectively. A part of the positive electrode active material and a part of the negative electrode active material enter the porous layers 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lead battery and a method of manufacturing the lead battery, and more particularly to a lead battery including an electrode plate in which an active material is held on a current collector and a method of manufacturing the lead battery.

  Among secondary batteries such as lithium secondary batteries and nickel metal hydride batteries, lead batteries are secondary batteries that are particularly excellent in low-temperature characteristics and balanced in battery characteristics and cost. For this reason, it is widely used for power supplies for portable devices and computers as well as automobiles. In recent years, new functions have been reconsidered not only as a main power source for electric vehicles but also as a starting power source and a recovery current for a hybrid electric vehicle and a simple hybrid vehicle.

  On the other hand, a lead battery is heavier than a lithium secondary battery or the like because of its heavier weight per unit volume, and is therefore inferior in terms of energy density. This is due to the use of a lead electrode having a larger specific gravity than a lithium secondary battery or the like. If the lead electrode is made as thin as possible to increase the electrode area per unit weight, it can be expected that the lead battery will be reduced in weight and energy density. In other words, in order to reduce the weight, increase the energy density, and increase the output of a lead battery, the current collector is made into a thin film, and the current collector is made as large as possible with the same weight of lead or lead alloy. There is a need to.

  However, in a lead battery, the current collector corrodes in the battery usage environment and causes corrosion elongation, causing troubles such as electrical shorts and penetration of the battery case, and eventually the battery function is stopped. As the current collector becomes thinner, the corrosion elongation occurs earlier, so the life is shortened and the reliability is lowered. As a technique for improving the corrosion resistance of a current collector and reducing the thickness of the current collector, the present applicant uses a powder rolling sheet formed by rolling a powder mainly composed of lead powder or lead alloy powder as a current collector. (For example, refer to Patent Document 1).

JP 2006-66173 A

  However, in the technique of Patent Document 1, since the active material is applied to the flat plate current collector, when the volume of the active material changes due to charge / discharge, the adhesion between the active material and the current collector decreases. There is. For this reason, the contact area between the active material and the current collector is reduced, and contact failure and peeling of the active material are likely to occur, which may lead to a decrease in electronic conductivity and an increase in internal resistance, which may reduce output and life. is there.

  An object of the present invention is to provide a lead battery and a method for manufacturing the lead battery that can achieve high output and long life.

  In order to solve the above problems, a first aspect of the present invention is a lead battery including an electrode plate in which an active material is held on a current collector, wherein the current collector is a molten lead or lead alloy. A base layer rolled or pressed so that the atomized powder rapidly solidified by spraying has the same density as the true density of the lead or lead alloy, and the atomized powder disposed on at least one side of the base layer And a porous layer formed by rolling or pressing so as to be porous at a lower density than the base layer.

  In the first aspect, since the current collector has a porous layer formed by rolling or pressing so that the atomized powder is porous at a lower density than the base layer, the current collector holds the active material. Since a part of the active material enters the porous layer, the contact area between the active material and the current collector is increased, so that the electron conductivity can be improved and the output can be increased. Therefore, the active material can be prevented from peeling off and the life can be extended.

  In the first aspect, the porous layer may be formed on the surface of the base layer. The atomized powder may be formed of a lead alloy melt containing tin. At this time, the lead alloy may contain one or more elements selected from calcium, aluminum, antimony, barium, strontium, bismuth, silver, selenium, and arsenic. Further, the atomized powder can be made into particles having an average particle size of several tens of μm and a maximum particle size of 500 μm or less. The thickness of the current collector may be in the range of 0.1 mm to 5.0 mm.

  According to a second aspect of the present invention, there is provided a method of manufacturing a lead battery comprising an electrode plate in which an active material is held on a current collector, the electrode plate spraying a molten lead or lead alloy. A base layer forming step of forming a base layer by rolling or pressing the atomized powder that has been rapidly solidified by solidification so as to have a density substantially equal to the true density of the lead or lead alloy; and at least a base layer formed in the base layer forming step The atomized powder is substantially uniformly laminated on one side, and is formed by a porous layer forming step in which a porous layer is formed by rolling or pressing so as to be porous at a lower density than the base layer, and the porous layer forming step. And an active material application step of applying an active material to the porous layer. In this case, it is preferable that the base layer is formed by a pair of horizontally opposed pressure rollers in the base layer forming step, and the porous layer is formed by a pair of vertically opposed pressure rollers in the porous layer forming step.

  According to the present invention, the current collector has a porous layer that is formed by rolling or pressing so that the atomized powder has a lower density than the base layer and is porous, so that when the active material is held on the current collector, Since a part of the active material enters the porous layer, the contact area between the active material and the current collector is increased, so that the electron conductivity can be improved and the output can be increased. Therefore, it is possible to obtain an effect that the active material can be prevented from peeling off and the life can be extended.

  Hereinafter, embodiments of a lead battery to which the present invention is applied will be described with reference to the drawings.

(Constitution)
As shown in FIG. 1, the lead battery 20 of this embodiment has a rectangular parallelepiped battery case 7 that serves as a battery container. The battery case 7 accommodates six electrode plate groups (cells) 4 in series. The material of the battery case 7 can be selected from polymer resins such as polyethylene and polypropylene which are excellent in terms of moldability, insulation and durability. The upper part of the battery case 7 is made of a polymer resin such as polyethylene and adhered or welded to the upper lid 10 having a horizontal cross section of a rectangular shape. On the upper surface of the upper lid 10, a positive electrode terminal 8 and a negative electrode terminal 9 for supplying electric power to the outside are provided on both ends of one long side. The upper lid 10 is provided with liquid stoppers (six), and the lead battery 20 is a liquid lead battery.

  In the electrode plate group 4, five rectangular positive electrode plates 1 and six rectangular negative electrode plates 2 are alternately stacked via separators 3 made of glass fiber or the like. The thickness of the separator 3 is preferably set to 10 to 600 μm, and is set to about 200 μm in this example. In the electrode plate group 4, a current collecting tab protrudes from one side located in the upper part of each of the positive electrode plate 1 and the negative electrode plate 2 in the battery case 7 toward the upper lid 10 side. The current collecting tab is provided so that a positive electrode is arranged on one side and a negative electrode is arranged on the other side of the upper side of the electrode plate group 4. A positive electrode strap (not shown) and a negative electrode strap 6 are provided at each protruding end of each current collecting tab of the positive electrode plate 1 and each current collecting tab of the negative electrode plate 2. The six electrode plate groups 4 are connected in series by a connection member (not shown). In the battery case 7, the positive electrode strap of the uppermost electrode plate group 4 is connected to the positive electrode terminal 8, and the negative electrode strap 6 of the lowermost electrode plate group 4 is connected to the negative electrode terminal 9.

  Each of the positive electrode plate 1 and the negative electrode plate 2 constituting the electrode plate group 4 has a current collector. The current collector has a powder rolling sheet (base layer) and a porous layer each formed of atomized powder that has been rapidly solidified by spraying a molten lead or lead alloy. The powder rolled sheet is rolled into a sheet shape so as to have substantially the same density as the true density of lead or a lead alloy. The porous layer is disposed on at least one side of the powder rolled sheet and is formed to be porous at a lower density than the powder rolled sheet. In this example, the powder rolled sheet and the porous layer constituting the current collector are formed of an atomized powder of a lead alloy (hereinafter abbreviated as a Pb—Sn alloy) containing 1.5% by weight of tin (Sn). ing. In the positive electrode plate 1 and the negative electrode plate 2, a positive electrode active material and a negative electrode active material are respectively applied to the surface of the porous layer formed on the current collector.

(Manufacturing)
In the production of the lead battery 20, the positive electrode active material and the negative electrode active material are respectively applied to the current collector to produce the positive electrode plate 1 and the negative electrode plate 2. As shown in FIG. 2, the positive electrode plate 1 and the negative electrode plate 2 are a powder forming step for forming atomized powder from a lead or lead alloy melt, and the obtained atomized powder is rolled to produce a powder rolling sheet. Rolling step (base layer forming step), second rolling step (porous layer forming step) for forming a porous layer on the surface of the powder rolled sheet, and applying step for applying a positive electrode active material and a negative electrode active material to the surface of the porous layer, respectively. It is produced through (active material application step). After arranging and assembling the obtained positive electrode plate 1 and negative electrode plate 2, the lead battery 20 is completed by chemical conversion. Hereinafter, it demonstrates in order of a process.

  In the powder forming step, atomized powder is formed by a gas atomization method in which a melt obtained by melting a Pb—Sn alloy is sprayed into the air to rapidly solidify. The obtained atomized powder has an average particle size of 20 to 50 μm (several tens of μm) and a maximum particle size of 500 μm or less. The atomized powder of the Pb—Sn alloy may be mixed with powders such as antimony and bismuth, and powders such as lead oxide and aluminum oxide substantially uniformly as necessary.

  In the first rolling step, a powder rolling sheet used for the current collector of the positive electrode plate 1 and the negative electrode plate 2 is formed. In the formation of the powder rolling sheet, a powder rolling apparatus is used. As shown in FIG. 3, the powder rolling apparatus includes a conveyor 21 for conveying the atomized powder 26 as a raw material, a hopper 22 having a substantially triangular cross section with an opening at the top and a slit-like outlet at the bottom, and a horizontal arrangement. A pair of horizontally opposed rollers 24 that are pressed against each other and a winding roller (not shown) are provided. The hopper 22 is disposed on the downstream side of the conveyor 21, and the horizontally opposed roller 24 is disposed in the vicinity of the lower portion (the discharge port) of the hopper 22.

  The atomized powder 26 formed in the powder forming step is placed on the conveyor 21 and conveyed toward the hopper 22. The conveyed atomized powder 26 is supplied into the hopper 22 from the upper opening. The atomized powder in the hopper 22 is discharged from the lower discharge port and continuously supplied between the horizontally opposed rollers 24. The dimensions of the discharge port of the hopper 22 are set to a slit width of 10 to 20 mm and a length of about 150 mm in this example. By pressing the atomized powder 26 discharged from the hopper 22 approximately evenly between the horizontally opposed rollers 24 and pulling it downward, a strip-shaped powder rolled sheet 11 having a thickness of about 0.2 to 1.0 mm and a width of about 150 mm is obtained. Form. At this time, the pressing force between the horizontally opposed rollers 24 is set so that the density of the powder rolled sheet 11 is substantially the same as the true density of the Pb—Sn alloy. The thickness of the powder rolling sheet 11 is set to about 0.8 mm in this example. The powder rolling sheet 11 is wound up in a roll shape by a winding roller (not shown).

  In the powder rolled sheet 11, the atomized powder 26 of the Pb—Sn alloy is dispersed substantially uniformly in a fine particle state with no density deviation. The atomized powders 26 are pressure-bonded to each other, and a metal bond portion is formed between the particles of the atomized powder 26 to form a three-dimensional network structure. This powder-rolled sheet 11 has crystal grains oriented in a specific direction with an aspect ratio of 3 to 13.

  As shown in FIG. 2, in the second rolling step, a porous porous layer having a lower density than the powder rolled sheet 11 is formed on the surface of the powder rolled sheet 11. As shown in FIG. 4 (A), the powder rolled sheet 11 wound up in the first rolling step is pulled out substantially horizontally, and the atomized powder 26 is laminated on the surface of the powder rolled sheet 11 approximately evenly. The powder rolling sheet 11 on which the atomized powder 26 is laminated is pressed and pulled out substantially evenly between a pair of vertically opposed rollers 25 that are arranged in the vertical direction and press each other. At this time, the pressing force between the vertical opposing rollers 25 is set to be smaller than the pressing force between the horizontal opposing rollers 24. As shown in FIG. 4 (B), the atomized powder 26 laminated on the powder rolled sheet 11 is pressed against the powder rolled sheet 11 by the pressing force between the vertically opposed rollers 25 and is pressed to the true density. Without being compressed, the porous layer 12 having a lower density than the powder rolled sheet 11 and having a porous shape is formed. In other words, when the porous layer is formed, the pressing force between the vertically opposed rollers 25 is adjusted so as to exhibit a porous shape in which the positive and negative electrode active materials can enter. As described above, the porous layer 12 having a thickness of about 0.01 to 0.3 mm is formed on the powder rolled sheet 11 having a thickness of about 0.2 to 1.0 mm, so that the thickness of the current collector 15 is increased. The length is about 0.21 to 1.3 mm.

  In the coating step, as shown in FIG. 4C, a positive electrode active material paste 17 and a negative electrode active material paste 18 are respectively applied to the surface of the porous layer 12 of the current collector 15, and the positive electrode plate 1 and the negative electrode plate 2 are applied. Is made. The positive electrode active material paste 17 is prepared by a normal formulation. After the positive electrode active material paste 17 is applied to the porous layer 12, it is left to mature for 18 hours in a temperature of 50 ° C. and a humidity of 95%. Furthermore, the positive electrode active material layer is formed on the surface side of the porous layer 12 by being left to dry at a temperature of 110 ° C. for 2 hours, and is cut into a desired size to obtain an unformed positive electrode plate 1.

  On the other hand, the negative electrode active material paste 18 is prepared by a normal formulation. Similarly to the production of the positive electrode plate 1, the negative electrode active material paste 18 is applied to the porous layer 12, and then left to mature for 18 hours in a temperature of 50 ° C. and a humidity of 95%. Furthermore, the negative electrode active material layer is formed on the surface side of the porous layer 12 by being left to dry at a temperature of 110 ° C. for 2 hours, and cut to a desired size to obtain an unformed negative electrode plate 2 (FIG. 4C )reference). When the positive electrode plate 1 and the negative electrode plate 2 are produced, the current collector 15 is formed of the powder-rolled sheet 11 and the porous layer 12, so that the aging time can be shortened or omitted. This is due to the following reason. That is, in general, in the conventional positive electrode plate and negative electrode plate, the current collector is oxidized under high temperature and high humidity during aging, and an appropriate corrosion layer is generated at the interface between the active material layer and the current collector. This corrosive layer greatly affects the adhesion and conductivity of the interface between the active material layer and the current collector. However, in this example, since the active material pastes 17 and 18 enter the porous layer 12, the adhesiveness and conductivity at the interface between the active material layer and the current collector are originally excellent, and the corrosion layer is minimized or unnecessary. Because it can.

  In battery assembly, the electrode group 4 is prepared and accommodated in the battery case 7, and then the lead battery 20 is completed by chemical conversion. That is, 5 sheets of unformed positive electrode plate 1 and 6 sheets of negative electrode plate 2 are alternately stacked via separator 3 so that positive electrode plate 1 and negative electrode plate 2 are not in direct contact with each other. Are connected by a positive electrode strap 5 and a negative electrode strap 6, respectively, to produce an electrode plate group 4. Six pieces of the electrode plate group 4 are accommodated in the battery case 7 and connected in series 6 to produce an unformed battery. A dilute sulfuric acid electrolyte solution having a specific gravity of 1.05 (20 ° C.) is poured into the battery case 7. After this unformed battery is formed at 9A for 42 hours, the electrolytic solution is discharged, and a diluted sulfuric acid electrolytic solution having a specific gravity of 1.28 (20 ° C.) is injected again. The positive electrode terminal 8 and the negative electrode terminal 9 were welded and sealed with the upper lid 10 to complete the lead battery 20. The voltage (cell voltage) of each electrode group 4 is set to 2.0 V, and the lead battery 20 in which the electrode groups 4 are connected in series 6 has a nominal voltage of 12 V and a capacity of 28 Ah.

(Action etc.)
Next, the operation and the like of the lead battery 20 of the present embodiment will be described focusing on the operation of the current collector 15 (the porous layer 12 and the powder rolling sheet 11).

  In a conventional lead battery, as a current collector, a metal sheet formed in a sheet shape with a rolling roll after casting lead or a lead alloy into a slab shape is used. In the case of a metal having a low melting point such as a lead alloy, the crystal grains are coarsened by recrystallization, and the particles are likely to be joined together to become large particles. For this reason, at the time of producing the positive electrode plate, as shown in FIG. 5A, after the positive electrode active material paste 17 is applied to the current collector 31 of the metal sheet, as shown in FIG. When aging in a humid environment, the reaction between the moisture in the positive electrode active material paste 17 and oxygen in the environmental atmosphere proceeds, so that the lead alloy of the current collector 31 and the like are at the interface with the positive electrode active material paste 17. Oxidized and corroded. As a result, after aging, as shown in FIG. 5C, a lead oxide corrosion layer 32 is formed at the boundary of the current collector 31 on the positive electrode active material layer side. In addition, the metal sheet used for the current collector 31 is more likely to corrode at the grain boundaries when the battery is used, causing corrosion elongation and corrosion thinning. May reduce life. That is, in the positive electrode plate, lead sulfate, lead dioxide, and the like are generated by repeated charge and discharge during use, and corrosion progresses. As a result, the current collector 31 is deformed to cause troubles such as an electrical short and penetration of the battery case, and finally the battery function is stopped. Moreover, since the corrosive layer 32 reduces the electronic conductivity, the output is reduced. Furthermore, when the volume of the active material changes due to charging / discharging, the adhesion between the active material and the current collector 31 is reduced, and the active material is peeled off, leading to a reduction in output and life. The lead battery 20 of this embodiment can solve these problems.

  In the present embodiment, the current collector 15 is formed of a powder rolled sheet 11 and a porous layer 12 having a lower density than the powder rolled sheet 11 and having a porous shape. A positive electrode plate 1 and a negative electrode plate 2 are formed by applying a positive electrode active material paste 17 and a negative electrode active material paste 18 to the surface of the porous layer 12. For this reason, a part of the positive electrode active material and a part of the negative electrode active material enter the porous layer 12. Thereby, the contact area between the positive and negative electrode active materials and the current collector 15 (the porous layer 12) is increased, so that the electron conductivity is improved and the output can be improved. In addition, since the adhesion between the positive and negative electrode active materials and the current collector 15 is improved, the positive and negative electrode active materials can be prevented from peeling off and the life can be improved.

  Moreover, in this embodiment, the powder rolling sheet | seat 11 of the collector 15 which each comprises the positive electrode plate 1 and the negative electrode plate 2 is formed by directly rolling the atomized powder 26 of a Pb-Sn type alloy. For this reason, in the powder rolling sheet 11, the atomized powder 26 is dispersed substantially uniformly in a fine particle state without unevenness in density. The atomized powders 26 are pressure-bonded so as to have substantially the same density as the true density of the Pb—Sn alloy, and a metal bond portion is formed between the atomized powders 26 to form a three-dimensional network structure. For this reason, since the influence of recrystallization and a crystal grain boundary is suppressed, the corrosion resistance of the powder rolling sheet 11 and by extension, the electrical power collector 15 can improve, and deformations, such as corrosion elongation, can be suppressed. Thereby, in the lead battery 20, a lifetime fall is suppressed by the part which the deformation | transformation of the collector 15 is suppressed, and input / output performance can be exhibited over a long term.

  Furthermore, in the current collector of the metal sheet, when the grain boundary is affected by an external corrosion factor, the intergranular corrosion is likely to proceed. In particular, when there is a metal segregated material, the segregation element and the segregation compound contact. The corrosion reaction is likely to proceed starting from the part. On the other hand, in the current collector 15 used in the present embodiment, in particular, the powder rolling sheet 11, the atomized powder 26 is directly rolled, and thus has crystal grains oriented in a specific direction with an aspect ratio of 3 to 13. ing. For this reason, a metal bond portion is formed between the atomized powders 26, and a boundary layer with extremely few segregating elements is formed at the boundary between the atomized powders 26. Thereby, the deformation | transformation accompanying corrosion and corrosion of the electrical power collector 15 can be suppressed.

  In the present embodiment, an example in which a powder rolling device is used to manufacture the current collector 15 and the powder rolling sheet 11 and the porous layer 12 are formed by the horizontal facing roller 24 and the vertical facing roller 25 is shown. Is not limited to this. Any device can be used as long as it can press the atomized powder 26 to form a sheet and can adjust the pressing force. For example, the atomized powder 26 may be filled in a mold having a fixed shape and press molded, or the plastically deformable container may be filled with the atomized powder 26 and pressed together with the container. Good.

  Moreover, although the example which rolled the powder-rolled sheet 11 which forms the electrical power collector 15, and the atomized powder 26 of the Pb-Sn type alloy as the porous layer 12 was shown in this embodiment, this invention is limited to this. is not. Atomized powder of lead may be rolled. In addition to tin, the atomized powder of lead alloy containing one or more elements selected from calcium, aluminum, antimony, barium, strontium, bismuth, silver, selenium, and arsenic is rolled. You may do it. Further, when the current collector 15 is formed, a powder such as lead oxide or aluminum oxide may be mixed in addition to the atomized powder 26 of lead or lead alloy. In this way, since the coarsening of the crystal grains is suppressed, the corrosion resistance of the current collector 15 can be improved.

  Furthermore, this embodiment shows an example in which the positive electrode plate 1 and the negative electrode plate 2 are produced by forming the porous layer 12 on one surface of the current collector 15 and applying the positive electrode active material paste 17 and the negative electrode active material paste 18 respectively. However, the present invention is not limited to this, and the porous layer 12 may be formed on both surfaces of the current collector 15. In this way, since the electrode reaction area is increased by applying the positive electrode active material paste 17 and the negative electrode active material paste 18 to both sides of the current collector 15, the output and capacity can be improved. In this embodiment, the thickness of the powder rolled sheet 11 is about 0.2 to 1.0 mm, the thickness of the porous layer 12 is about 0.01 to 0.3 mm, and the surface portion of the current collector 15 is porous. Although the example in which the layer 12 is formed is shown, the present invention is not limited to this, and for example, the thickness of the porous layer 12 may be larger than that of the powder rolled sheet 11. Although the example which sets it as about 0.21-1.3 mm about the thickness of the electrical power collector 15 was shown, it is not restrict | limited to this but can set in the range of 0.1-5.0 mm.

  Furthermore, in this embodiment, although the example which uses the electrical power collector 15 which formed the porous layer 12 as it is on the surface of the powder rolling sheet | seat 11 which rolled the atomized powder 26 was shown, this invention is restrict | limited to this. is not. For example, in consideration of an increase in the active material holding amount, it is preferable that the current collector 15 be subjected to drilling or expanding. In this way, the positive electrode active material and the negative electrode active material can be reliably held in the current collector 15, and the amount of active material retained increases by the amount filled in the voids formed between the lattice skeletons. The output of the lead battery 20 can be improved.

  Furthermore, in the present embodiment, the lead battery 20 having a nominal voltage of 12 V is illustrated, but the present invention is not limited to the voltage range. By changing the number of electrode groups 4 connected in series, for example, a lead battery having a nominal voltage of 36V can be produced, and various characteristics of the present invention do not change in the voltage range. Moreover, although the example which sets the capacity | capacitance of the lead battery 20 to 28 Ah was shown, this invention is not restrict | limited in particular also about a battery capacity.

  The present invention contributes to the manufacture and sale of lead batteries in order to provide a lead battery and a method of manufacturing the lead battery that can achieve high output and long life, and thus has industrial applicability.

1 is a perspective view showing a partially broken lead battery according to an embodiment to which the present invention is applied. It is process drawing which shows the principal part of the manufacturing method of the lead battery of embodiment. It is explanatory drawing which shows typically the preparation procedure of the powder rolling sheet | seat which comprises the electrical power collector used for the lead battery. It is sectional drawing which shows the preparation procedure of the positive / negative electrode board of a lead battery typically, (A) is a state when laminating and rolling an atomized powder on a powder rolling sheet, (B) is a porous layer on the surface of a powder rolling sheet. (C) shows a state where the active material paste is applied to the current collector. It is sectional drawing which shows typically advancing of the corrosion of a collector at the time of positive electrode plate preparation of a conventional lead battery, (A) is a state where an active material paste is applied to the collector, and (B) is aged for 1 day. (C) shows the state after aging.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 11 Powder rolling sheet (base layer)
12 Porous layer 15 Current collector 20 Lead battery 26 Atomized powder

Claims (8)

  In a lead battery including an electrode plate in which an active material is held on a current collector, the current collector is made of an atomized powder that is rapidly solidified by spraying a molten lead or lead alloy. A base layer rolled or press-formed so as to have substantially the same density as the true density, and a roll-formed or press-formed so that the atomized powder disposed at least on one side of the base layer is porous at a lower density than the base layer. A lead-acid battery.   The lead battery according to claim 1, wherein the porous layer is formed on a surface of the base layer.   The lead battery according to claim 1, wherein the atomized powder is formed of a molten lead alloy containing tin.   4. The lead battery according to claim 3, wherein the lead alloy contains one or more elements selected from calcium, aluminum, antimony, barium, strontium, bismuth, silver, selenium, and arsenic.   2. The lead battery according to claim 1, wherein the atomized powder is a particle having an average particle diameter of several tens of μm and a maximum particle diameter of 500 μm or less.   The lead battery according to claim 2, wherein the current collector has a thickness in a range of 0.1 mm to 5.0 mm. A method of manufacturing a lead battery comprising an electrode plate in which an active material is held on a current collector, the electrode plate comprising:
A base layer forming step of forming a base layer by rolling or pressing the atomized powder rapidly solidified by spraying a lead or lead alloy melt so as to have substantially the same density as the true density of the lead or lead alloy;
The porous layer forming step of forming the porous layer by laminating the atomized powder substantially evenly on at least one side of the base layer formed in the base layer forming step, and rolling or pressing so as to be porous at a lower density than the base layer When,
An active material application step of applying an active material to the porous layer formed in the porous layer formation step;
A method of manufacturing a lead battery, characterized by comprising:   The said base layer formation step forms the said base layer with a pair of horizontally opposed pressure rollers, and the said porous layer formation step forms the said porous layer with a pair of vertically opposed pressure rollers. A method of manufacturing a lead battery.

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