JPS5832739B2 - 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. A protrusion having a small protrusion for inducing an arc on its end face is passed through the partition wall hole, the small protrusion is brought into contact with the other connecting body, and the small protrusion is heated and melted by electricity, thereby inducing an arc. By melting the tip of the protrusion and the other connecting body facing it by an arc generated between themselves, and applying pressure to fuse this part, a highly reliable intercell connection structure can be created. The purpose is to make it possible to obtain it easily.

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 to 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 holes, the partition wall holes are damaged by heating, worsening the airtightness of the connection, and the partition wall This had the disadvantage of deteriorating the mechanical strength of the through-hole portion.

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 of the partition wall.

One of the connecting bodies 4 is provided with a protrusion 7 having a smaller diameter than the through-hole 3 of the partition wall, and a small protrusion 8 on the end surface of this protrusion passes through the through-hole 3 of the partition wall and contacts the other connecting body 5. is provided.

This small protrusion is for arc induction.

Reference numerals 9 and 10 denote pressure jigs for pressing the connecting bodies 4 and 5 toward the partition wall, and also serve as current-carrying terminals for arc generation.

11 energizes the pressure jigs 9 and 10 to press the protrusion 7 of the connecting body 4;
This is a DC power supply device that generates heat by energizing the contact between the small protrusion 8 on the end face and the other connecting body 5 that is in contact with it, and generates an arc by fusing the small protrusion. It has a grounding circuit and a high frequency generator, and has a
A voltage of 00V is applied.

This DC power supply device 11 supplies electricity to the connecting bodies 4 and 5, and instantaneously melts and cuts the small arc-inducing protrusion 8, thereby generating an arc between the protrusion 7 and the connecting body 5.

Incidentally, reference numerals 12 and 13 denote liquid-tight rings provided on the outside of the projections 7 of the connecting bodies 4 and 5 and the corresponding portions so as to surround these, and are inserted into the partition wall 2 by pressurization.

In the state shown in FIG. 1, press the pressure jigs 9 and 10 in the direction of the arrow to bring the small protrusion 8 on the end surface of the protrusion 7 into contact with the other connecting body 5, and turn on the switch of the power supply device. A current voltage of 3000 V and a current of 150 to 500 A are applied between the small protrusion 8 on the end face of the protrusion 7 of the connecting body 4 and the connecting body 5 in contact therewith, and the small protrusion 8 is instantly fused and an arc is generated. A trigger is activated to generate an arc between the protrusion and the connecting body, and the tip of the protrusion 7 and one side of the connecting body 50 facing the protrusion 7 are melted by the arc heat (see FIGS. 2 and 3).

In addition, it was experimentally preferable that the small protrusions have an outer diameter of 1 to 3 mTIL and a length of 1 to 3 mTIL, which easily melts when energized.

Welding conditions for commonly used automotive batteries with a capacity of 40 to 20 OAH are as follows: Diameter of the through hole provided in the partition wall: 8 to 20 rrrm Thickness of the partition wall around the periphery of the hole: 1 to 3 mm Pressure time of the pressure jig 4 to 6 Second voltage, current application time
0.05~0.2 seconds Melting current DC 150
~500A Melting time 0.2~0.
8 seconds Immediately after the tips of the protrusions 7 of the connecting bodies 4, 5 and one side of the connecting body 5 opposite thereto are melted, press the pressing jigs 9, 10 in the direction of the arrow at 15 shown in FIG. For example, the back surfaces of the protrusion 7 and the bridging body 5 are pressed against each other, and the tip of the melted protrusion 7 of the connecting body 4 and one side of the connecting body 50 are brought into close contact and solidified in a fused state. .

In this case, the pressure applied to the pressure jigs 9 and 10 is
Because the molten part of the tip and one side of the connecting body 5 maintains high temperature and softens, the amount of heat generated is relatively small (40 to 110 kq/cr).
r] is sufficient.

FIG. 5 shows the state of the inter-cell connection after welding has been completed by applying pressure.

Note that, outside of the upper side where both the protrusion 7 melted by arc heat and the connecting body 50 are pressed and fused to each other with a pressure jig, one side, for example, only the connecting body 5 is pressurized, and the connecting body 4 is pressed. may be fixed so that it does not move.

In this way, the present invention makes it easy to generate an arc by heat generation and fusing due to the energization of the small arc-inducing protrusion provided on the end face of the protrusion. Since it involves welding a portion of one side of the opposing connection bodies together, it is not necessary to weld 5 parts like conventional electric resistance welding.
Requires large current such as 000~10000A-i
The small protrusion is fused with an extremely small current of 150 to 500 A, and arc generation is then continued with a smaller current to melt the protrusion and the connecting body quickly due to arc heat, so welding time can be shortened.

Furthermore, since the required current is extremely small compared to electric resistance welding, the power supply can be made smaller, and unlike plasma arc welding, there is no need to provide a special electrode for arc generation, and the connection body and the connection body itself The protrusion can be used as an arc generating electrode.

Therefore, there is an advantage that an inert gas is not required, the work can be easily automated, and the mechanism of the welding device can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the inter-cell connection method of the present invention;
Figure 2 is a cross-sectional view showing the contact between the small arc-inducing protrusion and the connecting body, Figure 3 is a cross-sectional view when an arc is generated, Figure 4 is a cross-sectional view when pressurized, and Figure 5 is when welding is completed. FIG.

Claims (1)

[Scope of Claims] 1 Connecting bodies of adjacent cells are positioned on both sides of a through hole provided in a cell partition wall, and a protrusion having a small arc-inducing protrusion on an end face provided on one of the connecting bodies is Pass it through the hole,
The front = V protrusion is brought into contact with the other connecting body, and the small arc-inducing protrusion is heated and fused by electricity, thereby generating an arc between the opposing protrusion and the other connecting body, and causing the opposing part to 1. A method for connecting cells of a storage battery, which comprises melting and then applying pressure to both connecting bodies using a pressure jig to fuse the fused portions. 2 The small protrusion has an outer diameter of 1 to 31rrrrL and a length of 1 to 31
The inter-cell connection method of a storage battery according to claim 1, which is RTM.