JP2524781B2 - Monoblock type sealed lead battery - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead battery used for a power source of a portable electronic device, and more particularly to a monoblock sealed lead battery.

Conventional technology and its problems Sealed lead-acid batteries are widely used as a compact power source for portable electronic devices because the glass mat of the separator holds the electrolyte and does not flow, so the electrolyte does not leak outside the battery case. are doing.

2. Description of the Related Art In recent years, electronic devices have been made lighter, thinner, shorter, and smaller due to advances in electronics represented by semiconductors, and in particular, there is a remarkable tendency toward thinness in terms of portability. Under such circumstances, there is a strong need for a thinner battery as a power source. In order to make the sealed lead-acid battery even thinner, it is essential to reduce the wall thickness of parts other than the power generation element such as active materials, especially the battery case. A metal plate having no rigidity that does not permeate oxygen and does not deform even when the inside of the battery is pressurized or depressurized has been used in place of the conventional synthetic resin. A sealed lead-acid battery using a metal battery case usually has a pair of metal plates laminated with a single layer or a composite multilayer of a heat-welding synthetic resin film such as PE, PP, etc., facing them, and the same as the laminate film between them. A frame-shaped battery case frame made of a material is sandwiched between the battery case frame and the power generation element, and the peripheral part of the metal plate is heated while being pressed to heat the laminate film and the battery case frame. It is sealed by welding.

FIG. 5 is a perspective view showing the appearance of a conventional thin sealed lead battery, and FIG. 6 is a sectional view taken along the line AA in FIG.
In the figure, 1 is a battery case frame made of synthetic resin with an exhaust valve, 2 and 2'is a battery case plate in which a polyolefin synthetic resin film 9 or 9'of PE, PP or the like is laminated on a metal plate such as a steel plate. , 1
Reference numerals 0 and 10 'are battery terminals connected to the positive and negative electrode plates 4 and 5 through pole columns 11 and 11' penetrating a part of the battery case frame 1, and 6 is a mat-shaped separator made of glass fiber. . The battery case frame 1 and the battery case plates 2 and 2'are heat-welded by heating the laminate films 9 and 9'while pressing the medium. This type of sealed lead battery has poor adhesion between the poles and the battery case frame made of polyolefin-based synthetic resin, and the electrolyte penetrates into the interface between the poles and the synthetic resin due to capillary phenomenon, corrosion, etc. Creep often occurs, and as a countermeasure against this, a method of applying epoxy resin to the surface of the pole and melt-coating the synthetic resin body in a dry state to the extent that it is not completely cured is used. It was difficult to completely prevent the creep of the electrolytic solution even if the resin was interposed. Therefore, the conventional battery provided with the poles has a problem in promoting the thinning of the battery, such as deterioration in performance and damage to the equipment in which the battery is mounted.

In addition to the above problems, conventional batteries consist of a single battery (about 2V). To make this into a monoblock 4V, 6V or 2nV (n is the number of single cells) batteries Insulator sheets are sandwiched and piled up or arranged side by side to electrically connect the unit cells by connecting metal pieces by soldering or spot welding. The assembled battery manufactured in this way must be entirely covered with a synthetic resin case or heat-shrinkable tube and fixed, and whichever fixing method is used, the direction of battery thinning It went against me.

Means for Solving the Problems The present invention is directed to a battery case frame made of a plurality of heat-welded synthetic resins, a separator made of glass fiber, and
A power-generating element, which is made of a negative electrode active material and constitutes a unit cell that is housed in each partition frame of the battery case frame, and a conductive synthetic resin film are laminated. Or a sealed lead battery comprising a metal plate provided with a lead alloy current collector layer, and a battery case plate that is heat-sealed and hermetically sealed on both side openings of the battery case frame, A plurality of cells are arranged in a flat plate shape and are connected in series or in parallel so that the cell case plate also serves as a cell wall, a current collector, a pole, a connecting rod between the cells and a battery terminal. A monoblock sealed lead-acid battery characterized by the above.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the outer appearance of a 4 V thin sealed lead-acid battery according to the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. FIG. 3 is a perspective view showing the external appearance of a 6 V thin sealed lead-acid battery according to the present invention, and FIG. 4 is a sectional view taken along the line AA in FIG. In the figure, reference numeral 1 is a battery case frame body made of a heat-welding synthetic resin such as PE or PP, and an exhaust valve is provided in a part thereof and an exhaust port 8 is provided. 2,21,22,23 are battery case plates made of steel plates or steel plates plated with tin, zinc, nickel, copper, etc., or metal plates having rigidity such as stainless steel plates. Conductive film 3,31,32,33 made of blended heat-welding synthetic resin or thermo-plastic / rubber etc., thickness 0.03-0.5mm, specific resistance about 0.4Ωcm and excellent corrosion resistance to sulfuric acid
Are laminated. This conductive film is laminated directly on the inner surface of the battery case plate or is bonded by a conductive adhesive or the like, and it has electronic conductivity with the metal plate forming the battery case plate, and the metal plate is the battery's battery. Tank plate, collector,
It has the five functions of a pole, a battery terminal and a continuous rod between cells. 7,71,72,73 are conductive films 3,31,32,
The surface of 33 is a current collecting layer formed by spraying lead or a lead alloy on the surface of the battery, except for the portion that is thermally welded to the battery case frame 1.

The positive electrode active material layers 4, 41, 42 or the negative electrode active material layers 5, 51, 52 are formed on the surfaces of the current collecting layers 7, 71, 72, 73 by pouring, coating or pressure molding. A pair of positive and negative electric layer plates produced in this manner are opposed to each other, and a mat-shaped separator 6 made of glass fiber and a battery case frame 1 are interposed therebetween, and heat-sealed and sealed in the same manner as in the conventional method. To do.

EFFECTS OF THE INVENTION The present invention does not have a pole column for penetrating the side portions of the synthetic resin frame from the positive and negative electrodes inside the battery case to take out the terminal, so that there is no creep of the electrolytic solution and there is no pole column, so there is no electrical insulation. The thickness of the battery case required for holding the battery can be reduced, and the battery structure is very effective for thinning the battery.
A monoblock battery having a voltage of V), that is, 2 nV (n is the number of single cells) or more can be easily manufactured without changing the battery thickness, and its industrial value is great.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of a 4 V thin sealed lead-acid battery according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.
FIG. 3 is a perspective view showing the appearance of a 6 V thin sealed lead-acid battery according to the present invention, and FIG. 4 is a sectional view taken along the line AA in FIG.
FIG. 5 is a perspective view showing the appearance of a conventional sealed lead battery, and FIG. 6 is a sectional view taken along the line AA in FIG. 1 …… Battery case frame, 2,21,22,23 …… Battery board, 3,31,32,33…
… Conductive film, 4,41,42 …… Positive electrode active material, 5,51,52…
… Negative electrode active material, 6,61,62 …… Separator, 7,71,72,73,7
4,75 …… Current collector layer

Claims (1)

(57) [Claims] 1. A battery case frame made of a plurality of heat-welding synthetic resins, a separator made of glass fiber, and positive and negative electrode active materials, and housed in each partition frame of the battery case frame. And a conductive synthetic resin film is laminated on the unit cell, and a metal plate having a lead or lead alloy current collecting layer provided on the power generating element contact portion is further laminated on the unit. What is claimed is: 1. A sealed lead-acid battery comprising a battery case plate that is heat-sealed and hermetically sealed on both side openings of a frame body, wherein the battery case plate has a battery cell wall, a current collector, a pole and a unit cell. A monoblock sealed lead battery, wherein a plurality of cells are arranged in a flat plate shape and are connected in series or in parallel so as to also serve as a connecting rod and a battery terminal.