JPS5833663B2 - Connection method between storage battery cells - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for connecting cells in a storage battery, in which connecting bodies for adjacent cells are respectively located on both sides of a through hole provided in a battery case partition, and a connecting body is provided in one connecting body. The protrusion is passed through the partition wall through-hole and brought into contact with the other connection body, and this portion is melted using a heating jig, such as an electric iron that itself generates heat when energized, and the melted portion is pressurized. It is an object of the present invention to make it possible to obtain a highly reliable intercell connection structure with good workability by applying pressure with a tool.

Traditionally, this type of cell-to-cell connection method involves inserting protrusions provided on the connection bodies of adjacent cells into the partition wall through-holes, abutting them, and applying current while applying pressure, which causes the abutted portions to melt due to resistance heat generation. or by passing a protrusion provided on one cell connection body through the partition wall through-hole and the through-hole provided on the other connection body, and crimping the tip of the protrusion against the periphery of the connection body through-hole. etc. were taken.

However, the former method is electric resistance welding that uses Joule heat, and as this Joule heat is generated inside the partition wall through-holes, the partition wall through-holes are damaged by heating, worsening the airtightness of the connection area, and the partition wall through-holes are damaged by heating. This had the disadvantage of deteriorating the mechanical strength of the hole.

On the other hand, although the latter method does not cause damage to the partition wall through-holes, since it is fixed by caulking, it requires skill during the caulking process and has the disadvantage of complicating the work.

The present invention is a manufacturing method capable of eliminating such conventional drawbacks and providing an intercell connection structure with good workability and excellent reliability, and examples thereof will be described below.

In FIG. 1, 1 is a battery case, 2 is a partition wall thereof, and a through hole 3 is provided for connection between cells.

Reference numerals 4 and 5 denote inter-cell connectors provided between two adjacent cells 6 via a partition wall, and the width thereof is larger than the diameter of the through hole 3 in the partition wall.

One of the connecting bodies 4 is provided with a tapered projection 7 having a tip smaller in diameter than the through hole 3 in the partition wall and a larger diameter at the base, and the end surface of this projection passes through the through hole 3 in the partition wall. It is in contact with a recess 8 provided in the other connecting body 5.

9.10 is a pressing jig for pressing the connecting bodies 4, 5 against the partition wall side.

Reference numeral 11 denotes heat welding that penetrates one pressurizing jig 10 and heats the contact surface between the protrusion 7 and the recess 8. For example, as shown in FIGS. 3 and 4, a heat-resistant metal such as tungsten or titanium is used. This is an electric iron consisting of a conical part 12a and a shaft part 12b connected to the conical part 12a, and the central part is cut out to divide the shaft part into two, making it high resistance and improving its own heat generation, A steel band 13 for energization is connected.

Reference numeral 14 and 15 denote a liquid-tight ring which is integrally provided on the outside of the protrusion 7 of the connecting bodies 4 and 5 and the corresponding recess 8 so as to surround it, and is inserted into the partition wall 2 by pressurization.

In the state shown in FIG. 1, the pressure jigs 9 and 10 are pressed against the partition wall 2 side to bring the end face of the protrusion 7 into pressure contact with the recess 8 of the other connecting body 5, and the heating jig 11 is attached to this part. If you press it from the outside and turn on the power supply switch, heating jig 1
1, an alternating current of about 4000A flows and instantaneously changes to 90 (J~
It is heated to 1500° C., and the conical portion sinks into the connecting body 5, melting the contact portion between the protrusion and the recess, and welding this portion (see Fig. 2).

The electric iron, which is a heating jig, is instantaneously heated by a large current of 3000 to 5000 A of AC or DC applied through the steel strip 13, so its material is resistant to lead adhesion, heat resistance, oxidation resistance, and heat resistance. It is necessary to select the material in consideration of the resistance value for self-heating, and the above-mentioned tungsten or titanium is preferable.

Furthermore, by cutting out the center of the shaft connected to the conical part of the iron to lengthen the current path, the electric resistance of the iron increases and heat generation becomes better.

Further, the power source may be either alternating current or direct current, but alternating current is preferable in terms of less current loss in the current flow path.

In FIG. 2, the dent 16 was formed when an electric iron was pressed against it, and it remained as it was after cooling.

Incidentally, although a large current is required to be applied to the heating jig, the applied voltage may be about 5 to 24 V, and operational safety can be improved.

If such a heating jig and a pressure jig are used to weld the inter-cell connectors together by heat welding, the connection can be completed in 4 to 5 seconds, including heat welding and cooling. Connections between cells can be made in a stable state with good workability.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the inter-cell connection method of the present invention, FIG. 2 is a cross-sectional view showing the inter-cell connection after welding is completed,
FIG. 3 is a perspective view showing the heating jig, and FIG. 4 is a sectional view thereof.

Claims (1)

[Scope of Claims] 1 Connecting bodies of adjacent cells are positioned on both sides of a through hole provided in a battery case partition wall, and a protrusion provided on one connecting body is passed through the through hole of the partition wall to connect the other cell. A self-heating type that has high heat resistance and oxidation resistance, and has the central part cut out to divide the shaft part that connects to the conical part, by making contact with the connecting body and applying pressure to this contact part with a pressure jig. A method for connecting cells of a storage battery, characterized by welding with a heating jig. 2. The method for connecting cells of a storage battery according to claim 1, wherein the connecting body is provided with a ring-shaped protrusion that contacts the outer peripheral edge of the partition wall through-hole. 3. The inter-cell connection method for a storage battery according to claim 1, wherein the portion of the other connecting body that comes into contact with the protrusion provided on one connecting body is flat or concave.