JP2006024488A - Cylinder-shaped sealed lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder-shaped sealed lead-acid storage battery capable of improving output characteristics. <P>SOLUTION: The battery has an electrode group formed by winding a cathode plate and an anode plate composed of a current collector 1 having many holes 2 and an activator filled in the current collector 1 through a separator. An area a as an area of an opening end of the holes 2 on the current collector and area b as an area of the inner peripheral face of the hole 2 fulfill the relation; a>b, and a ratio of a surface area p of the current collector at one side on the cathode plate or the anode plate to an area q of the electrode plate at one side is to range between 0.90 and 1.00. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cylindrical sealed lead-acid battery.

  The electrode plate group of the cylindrical sealed lead-acid battery has a structure in which a long positive electrode plate and a negative electrode plate are wound via a separator. In order to improve the output characteristics of such a cylindrical sealed lead-acid battery, as shown in FIG. 4, an electrode having a structure in which a long positive electrode 1 and a negative electrode 2 are wound via a separator (not shown). It has been proposed to increase the width of the positive electrode plate 1, the negative electrode plate 2, and the ears 1a, 2a in the plate group 3 toward the outer peripheral side (see Patent Document 1).

When such an electrode plate group 3 is used, the internal resistance of the battery can be reduced and the output characteristics can be improved.
JP 2002-157991 A

  However, as shown in FIG. 4, when the width of the ears 1a and 2a of the electrode plate group 3 is increased toward the outer peripheral side, the internal resistance of the battery can be reduced. However, the width of the ears 1a and 2a The structure is often limited, and there is a problem that cannot be said to be sufficient to bring out the output characteristics to the maximum.

  Compared with nickel metal hydride batteries, lithium ion batteries, etc., lead storage batteries have low output per weight or output per capacity but are inexpensive, so if a small and high output lead storage battery can be made, its utility value will increase. there is a possibility.

  An object of the present invention is to provide a cylindrical sealed lead-acid battery capable of improving output characteristics.

  The present invention provides an electrode plate group in which a positive electrode plate and a negative electrode plate each made up of a current collector in which a large number of holes are formed and an active material filled in the current collector are wound via a separator. The target is a sealed cylindrical lead-acid battery.

  In the cylindrical sealed lead-acid battery according to the present invention, there is a relationship of a> b between the area a of the opening end of the hole of the current collector and the area b of the inner peripheral surface of the hole, and The ratio p / q of the surface area p of one surface of the current collector of the positive electrode plate or the negative electrode plate to the area q of one surface of the electrode plate is in the range of 0.90 to 1.00, To do.

  In order to enable large current discharge in the cylindrical sealed lead-acid battery that is the subject of the present invention, it is desirable to reduce the current density by reducing the resistance in the discharge reaction, especially when short-time output is required. The effect of lowering the resistance of lead parts such as current collectors and connecting parts is greater than the resistance related to the reaction of the active material.

  The interface between the active material and the current collector is a place where electrons are transferred. Therefore, the resistance at the interface between the active material and the current collector is also considered to be an important factor when a short-time output with a large current is required. Therefore, in order to reduce the current density at the interface between the active material and the current collector, the relationship between the area a of the opening end of the hole of the current collector and the area b of the inner peripheral surface of the hole is a> b, In addition, the ratio of the surface area p of one surface of the current collector of the positive electrode plate or the negative electrode plate to the area q of one surface of the electrode plate is p / q in the range of 0.90 to 1.00, and the active material and the current collector By optimizing the contact area of the body, it is possible to increase the output of the cylindrical sealed lead-acid battery. In the case of a ≦ b, a thin electrode plate can be made, but the amount of the active material becomes extremely small, which is not useful. When p / q is smaller than 0.90, the resistance increases, which is not preferable. When p / q exceeds 1.00, the resistance is difficult to decrease and corrosion of the current collector is likely to proceed, which is not preferable.

  An example of the best mode for carrying out the present invention will be described with reference to the plan view of the current collector shown in FIG. 1 and the enlarged perspective view of the holes of the current collector shown in FIG.

  As shown in FIG. 1, using a lead alloy foil having a thickness of 0.7 mm, a current collector 1 having a width of 80 mm and a length of 600 mm was punched to form a plurality of holes 2 in a plurality of stages in the vertical and horizontal directions. At this time, the current collector 1 was prepared by changing the ratio p / q of the surface area p of one surface of the current collector 1 to the area q of one surface of the electrode plate. The current collector 1 was prepared so that the relationship between the area a of the opening end of the hole 2 of the current collector 1 and the area b of the inner peripheral surface of the hole 2 was a> b. In this case, the ratio p / q between the surface area p of one surface of the current collector 1 and the area q of one surface of the electrode plate is p / q <1. Here, when the area a of the opening end of the hole 2 of the current collector 1 is relatively small and the current collector 1 is thick, a <b. For example, in the case of the current collector 1 having a thickness of 0.7 mm, assuming that the shape of the hole 2 is a rectangle, when the size of the hole 2 is 2 mm × 3 mm, a <b. In this case, a thin electrode plate can be made, but the amount of active material becomes extremely small, which is not useful in practice. That is, when a ≦ b, a thin electrode plate can be produced, but the amount of active material becomes extremely small, which is not useful. Assuming that the size of the hole 2 is 10 mm × 5 mm, a <b holds when the thickness of the current collector 1 is 1.7 mm. In this case, the electrode plate becomes thick and the area of one surface of the electrode plate in a certain volume becomes small, so that a high output battery cannot be produced.

  Moreover, the width | variety of the ear | edge part which is not illustrated of the electrical power collector 1 was created as wide as possible on the structure.

  Next, an electrode plate was prepared using the current collector 1. The positive electrode plate was filled in the current collector 1 after kneading lead powder having an oxidation degree of 70% and dilute sulfuric acid to obtain an active material paste. For the negative electrode plate, a small amount of carbon powder, lignin, and barium compound were added to lead powder with an oxidation degree of 70%, kneaded with dilute sulfuric acid, and then filled into current collector 1.

  Next, these positive electrode plate and negative electrode plate were wound through a separator, assembled, and subjected to chemical conversion to obtain a cylindrical sealed lead-acid battery.

  These batteries were discharged at 300 A, the voltage at the first second after the discharge was subtracted from the circuit voltage before the discharge, and this value was divided by the discharge current to determine the resistance.

  FIG. 3 shows the relationship between the ratio p / q of the surface area p of one surface of the current collector 1 to the area q of one surface of the electrode plate and the resistance. As p / q increases, the resistance decreases. When p / q exceeds 0.7, the resistance decreases greatly. When p / q is 0.9 to 1.0, the output performance is good. Show.

It is a top view of an example of a current collector used in the present invention. It is an expansion perspective view of the hole of the electrical power collector shown in FIG. It is a figure which shows the relationship between ratio p / q of the surface area p of the one surface in an electrical power collector, and the area q of the one surface in an electrode plate, and resistance. It is a perspective view of the conventional electrode group.

Explanation of symbols

1 current collector 2 hole

Claims (1)

Cylindrical sealing having an electrode plate group in which a positive electrode plate and a negative electrode plate each composed of a current collector in which a large number of holes are formed and an active material filled in the current collector are wound via a separator In the lead acid battery,
The area a of the opening end of the hole of the current collector and the area b of the inner peripheral surface of the hole have a relationship of a> b, and the current collector of the positive electrode plate or the negative electrode plate has a relationship of a> b. A cylindrical sealed lead-acid battery characterized in that the ratio p / q of the surface area p of one surface and the area q of one surface of the electrode plate is in the range of 0.90 to 1.00.

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