JPH0588515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to an improvement in a small monoblock sealed lead acid battery that eliminates a flowing electrolyte.

Conventional technology and its problems The demand for small sealed lead-acid batteries is increasing with the expansion and popularization of portable devices, and recently there has been a particularly strong demand for miniaturization, improvement in energy density, and cost reduction.

Conventional batteries are made by filling a grid with paste, then aging and drying it, and using the chemically formed and dried plates as necessary to form a plate group, which is then inserted into an injection molded battery case to connect the cells. The battery case and lid were connected. In this case, because of the two steps of forming the battery case and inserting the electrode plate group into the battery case, it was difficult to make the battery smaller and thinner. In other words, the former is because if the core is thin, it will move due to the pressure of the molten plastic during injection molding.
The latter is because it is difficult to insert the thin element through the thin opening of the container.

In addition, a single-cell battery has been proposed that combines two half-split batteries with a structure in which a plate-shaped current collector is fixed and an active material is adhered to it, but the adhesion between the current collector and the positive electrode active material is Not only is it difficult to maintain the
Since cells are required, the mass of terminals and connections between cells,
The disadvantage was that the volume increased and the energy density decreased.

Means for Solving the Problems The present invention integrates the grids of two adjacent cells through a connecting conductor formed on the side of the grid, and the connecting conductor connects the partition walls of the two adjacent cells to one another. It has a structure in which two half-split monoblock battery cases are joined together, with the lattice and connecting conductor fixed to the side walls and partition walls of the case during injection molding, and the molten plastic is injected during the injection molding of the case. By providing the gate at the fixed portion between the grid and the side wall of the battery case, the above-mentioned problems in monoblock sealed lead-acid batteries can be solved.

Embodiment FIG. 1 is a diagram for explaining the structure of a monoblock sealed lead-acid battery according to the present invention, and FIG. 2 is a longitudinal cross-sectional view of a main part showing the state of a battery case during injection molding. In the figure, 1 is a 3-cell half-split injection battery case, 2 and 2' are side walls, and 3
is the bottom of the container, 4 is the inner lid, and 5 is the partition wall. Reference numeral 6 denotes a lattice which is integrated with the lattice 6' of an adjacent cell through a connecting conductor 7. The grid 6 is fixed to the battery case side wall 2, and the grid 6' is fixed to the battery case side wall 2'. Both are fixed using an injection mold 8 as shown in Figure 2.
A grid and connecting conductors are fitted between and 9 and are made by injection molding of molten thermoplastic. The injection gate 10 at this time is provided at a fixed portion between the grid and the side wall of the battery case. 10' in FIG. 1 is a portion facing the injection gate 10 at the grid intersection point.

Since the molten plastic injected from the injection gate presses the grid against the mold 8, it is possible to prevent plastic from flowing between the grid and the mold and covering the entire surface of the grid with plastic. This is important for improving the electrical bond between the active material and the grid.

A half-split injection container 1 to which the grid and connecting conductors are fixed is filled with positive electrode and negative electrode pastes. Naturally, the polarities of the pastes in adjacent cells are different.

Two half-split monoblock battery containers filled with paste are made with a positive electrode plate and a negative electrode plate facing each other with a porous separator in between, and are joined by ultrasonic waves or heating with a hot plate. FIG. 3 is a perspective view showing the monoblock sealed lead-acid battery of the present invention thus completed. In the figure, 11 is a joint between the battery cases 1 and 1', and 12 is an exhaust valve.

Effects of the Invention The monoblock sealed lead acid battery according to the present invention has the following effects and features.

B. The battery can be made thinner and the degree of pressure on the electrode plate surface can be increased.

Since the connection between cells requires no heating or other operations, it is easy to maintain airtightness and requires less man-hours.

(c) The surface of the grid that is fixed to the side wall of the battery case and protrudes into the cell is not excessively covered with plastic, and good electrical bonding between the active material and the grid is maintained.

D. Since the connecting conductor between adjacent cells is provided on the side of the electrode plate and passes through the partition wall, the internal resistance of the battery is low.

From the above effects and features, it is possible to achieve smaller and thinner batteries, stable performance, improved energy density, and reduced man-hours.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the structure of a monoblock sealed lead-acid battery according to the present invention, Fig. 2 is a vertical cross-sectional view of the main part showing the state of the battery case during injection molding, and Fig. 3 is a diagram illustrating the structure of the monoblock sealed lead-acid battery according to the present invention. It is a perspective view showing a sealed lead acid battery. 1...Half-split injector battery case, 2,2'
...Battery case side wall, 5...Partition wall, 6,6'...Grate,
7... Connection conductor, 8, 9... Injection mold, 10... Injection gate.

Claims (1)

[Claims] 1 The grids of two adjacent cells are integrated through a connecting conductor formed on the side of the grid, and the connecting body penetrates the partition wall of the two adjacent cells at the side of the electrode plate. It has a structure in which two half-split monoblock battery cases are joined together, with the grid and connecting conductors fixed to the side walls and partition walls of the case during injection molding. ,
A monoblock sealed lead-acid battery without a flowing electrolyte, which is characterized by being provided at the fixed part between the grid and the side wall of the battery case.