JPH09147828A - Storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance volumetric energy density by positioning the lower end of a partition wall through hole of a monoblock battery jar below an upper surface of a strap. SOLUTION: The lower end of a partition wall through hole 2 of a monoblock battery jar 1 is positioned below an upper surface of a strap 3, and a position of the strap 3 is raised without changing a diameter and a position of the partition wall through hole 2, and a height of a plate group is raised according to it. Therefore, in a storage battery having the same volume, capacity is increased, and a battery having large volumetric energy density is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead storage battery.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional storage battery generally has a partition through hole located above the upper surface of the strap.

[0003]

However, in the conventional storage battery as shown in FIG. 2, since the cells are connected above the upper surface of the strap, the upper space in the cell is unnecessarily increased. Has a bad volumetric energy density. In particular, in the sealed battery in which the gas absorption reaction is performed at the cathode, the upper space in the cell may be extremely small, so that a battery having a high connection between cells and a large volume energy density has been desired.

Further, if the diameter of the partition wall through hole is made small, the cell connecting portion can be made high, but there is another drawback that the voltage drop at the cell connecting portion becomes large and the output density of the storage battery becomes poor.

The present invention has been made to solve the above problems, and an object of the present invention is to maintain the voltage drop at the cell-to-cell connecting portion and the strap at the same level as that of the conventional battery. It is to provide a storage battery having a large volumetric energy density by reducing the upper space inside.

[0006]

In the inter-cell connection in which the electrode plate group straps of adjacent cells are connected by resistance welding via the partition wall through hole of the monoblock battery case, the lower end of the partition wall through hole is strapped. The problem is solved by arranging the strap below the upper surface so that the cross-sectional area of the strap becomes maximum on the side of the inter-cell connecting portion and gradually decreases toward the opposite side.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Increasing the volumetric energy density of a storage battery means increasing the capacity of a storage battery having the same volume (same size), that is, increasing the electrode plate group. As shown in FIGS. 1 and 3, by locating the lower end of the partition through hole 2 below the upper surface of the strap 3, the position of the strap 3 is raised without changing the diameter and position of the partition through hole 2. This can be achieved by increasing the height of the electrode plate group. The upper surface of the strap here means the upper surface of the strap in the horizontal portion.

In order to keep the voltage drop at the cell-to-cell welds and the strap at the same level as that of the conventional battery, the sectional area of the partition wall through-hole and the strap in the direction perpendicular to the direction of current flow is the same as that of the conventional storage battery. This means equalization. Specifically, the partition wall through-hole diameter should be the same as the conventional one, and the strap cross-sectional area should be the same so that the cross-sectional area should be the same on the side of the cell-to-cell connecting portion. This can be achieved by continuously providing vertical straps that are maximal and gradually reduced toward the opposite side.

[0009]

As described above, according to the storage battery of the present invention, there is an effect that the volumetric energy density can be improved while keeping the voltage drop at the cell connecting portion and the strap equal to that of the conventional battery.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional example.

FIG. 3 is a sectional view showing one embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Monoblock battery case 2 Bulkhead through hole 3 Strap 4 Cell connection part

Claims (1)

[Claims] 1. A pole plate group strap (3) of cells adjacent to each other through a partition through hole (2) of a monoblock battery case (1).
Cell-to-cell connection (4) that connects each other by resistance welding
In the storage battery including the storage battery, the lower end of the partition wall through hole is located below the upper surface of the strap, and the cross-sectional area of the strap becomes maximum on the side of the inter-cell connecting portion side and decreases toward the opposite side.