JPH0223975B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a battery assembly in which a plurality of cylindrical batteries each having a safety valve built into a metal cap and having a gas discharge hole are connected in series.

Conventional Structure and Problems Conventionally, series connection of this type of batteries has been carried out using a dish-shaped connecting plate 1a as shown in FIG. As shown in FIG. 3, the batteries were connected by interposing these connectors and an insulating plate 6 between a plurality of batteries. However, in this connection method, as shown in FIG. 4, the connecting body 1a is directly welded to the head 4 of the metal cap 3 of one battery 2a, so the area of the welded joint is small and unstable.
For this reason, vertical bending of the batteries and misalignment between the batteries tend to occur, and in order to solve these problems, it is necessary to use a jig or the like to correct the bending and misalignment. However, there were drawbacks such as extremely poor workability and economic efficiency and poor appearance.

In addition, there is a problem in that external shocks applied to the metal cap 3, heat during welding, etc. adversely affect the valve operating pressure in the safety valve located inside the metal cap 3, especially when a rubber valve is used. It was hot.

Purpose of the Invention The present invention aims to solve the above-mentioned conventional problems, and eliminates bending of batteries, misalignment between batteries, leakage of electrolyte inside the battery, etc. The purpose of this invention is to provide a battery assembly that does not adversely affect the safety valve installed in the battery.

Structure of the Invention The battery connection device of the present invention includes a top cylindrical part, a recessed part having a gas venting groove provided on the outer periphery of the top cylindrical part, and a cylindrical peripheral part having a stepped part continuous to the periphery of the recessed part. It consists of a connecting body integrally formed with a ring-shaped liquid absorbing plate, and a plurality of cylindrical batteries each having a safety valve built into a metal cap and a gas discharge hole. The cylindrical part of the connecting body is fitted into the outer periphery of the concave part, and the cylindrical part of the connecting body is fitted into the metal cap that is the electrode part of one of the batteries, and the concave part of the connecting body and the collar of the metal cap are welded together. , a gap is provided between the upper surface of the cylindrical part of the connecting body and the head of the metal cap, and the cylindrical peripheral part having the stepped part is fitted into the case which is the electrode part of the other battery. It is welded. This configuration prevents bending of the batteries, misalignment between the batteries, and leakage of the electrolyte inside the batteries to the outside when connecting the batteries, and also prevents the safety valve inside the metal cap, which is the electrode part of the battery, from occurring. It can protect against external impact and heat during welding.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 to 7. In the figure, 7 is a cylinder having a top-closing cylindrical part 11, a recessed part 9 having a gas venting groove 10 provided on the outer periphery of this cylindrical part 11, and a stepped part 12 continuous to the periphery of the recessed part. 14 is a ring-shaped liquid absorption plate, and 2a and 2b are cylindrical batteries to be connected.

Next, the series connection of a plurality of cylindrical batteries will be explained. FIG. 5A is a plan view showing a connected body of an assembled battery according to the present invention, and FIG. 5B is a sectional view thereof, and FIG.
The figure is a perspective view before the batteries are connected in series using a connecting body and a ring-shaped liquid absorption plate, and FIG. 7 is a sectional view showing the state in which the batteries are connected in series. First, a ring-shaped liquid absorption plate 14 is fitted into the outer circumferential portion of the concave portion 9 of the connecting body 7 in contact with the stepped portion 12, and the top cylindrical portion 11 of the connecting body 7 is connected to the electrode portion of one battery 2a. The connector 7 is fitted into a certain metal cap 3 to facilitate positioning of the connector 7, and the concave portion 9 of the connector 7 is spot-welded to the collar 5 of the metal cap 3 at a plurality of locations. At this point, a gap 13 is created between the upper surface of the cylindrical part 11 of the connecting body 7 and the head 4 of the metal cap 3, so that even if an external impact is applied, the metal cap 3 is not affected. ing. In addition, since the concave portion 9 of the connecting body is welded to the collar 5 of the metal cap 3, the welding area becomes wider than before, improving mechanical strength after welding, and reducing instability in fixing the connecting body itself. This eliminates this problem and improves the strength against bending of the batteries after they are connected in series. In addition, since the welded part is far from the head 4 of the metal cap 3, the safety valve using a rubber valve located inside the metal cap 3 will temporarily soften due to the heat during welding, and the valve operating pressure will become unstable. This can prevent it from becoming stable. Further, when the valve is activated due to abnormal charging or discharging after welding, the gas released from the gas exhaust hole (not shown) provided in the cap can be easily released to the outside through the gas venting groove 10. I can do it. In order to absorb the atomized electrolyte contained in the gas released at that time or the electrolyte that may be pushed out from the battery 2 by the gas pressure, a ring-shaped liquid absorbent is formed on the outer periphery of the concave portion 9 of the connecting body 7. The plates are fitted to prevent the electrolyte from leaking outside. As described above, the connecting body 7, which fits and holds the ring-shaped liquid absorption plate 14 whose concave part is welded to the cap, which is the electrode part of one battery 2a, connects the cylindrical peripheral part 8 to the cap, which is the electrode part of one battery 2a. It is fitted and welded to the case which is the electrode part of 2b.

Effects of the Invention The present invention provides the following effects.

(1) There is no bending in the connection between the batteries, and the strength of the connection between the batteries is improved.

(2) The top cylindrical part provided on the connecting body allows it to easily fit into the metal cap, which is the electrode of the battery, and a gap is provided between the top surface of the cylindrical part and the head of the metal cap. The safety valve inside the cap can be protected from external impact.

(3) Since the concave part of the connection body is welded to the collar of the metal cap, the welding surface area is wider than before, greatly improving the welding strength, and the heat during welding is reduced. The degree of action on the safety valve inside the metal cap can be reduced.

(4) Since a gas vent groove is provided in the concave part of the connection body, even if the safety valve is activated and gas is released from the exhaust hole provided in the cap, the gas can be easily released to the outside. I can do it.

(5) Since batteries can be connected in series without using special jigs, work efficiency can be greatly improved.

(6) A ring-shaped liquid absorption plate is fitted to the outer periphery of the concave part of the connection body, so even if electrolyte leaks from the battery, the liquid absorption plate absorbs it and prevents leakage to the outside. You can.

[Brief explanation of drawings]

1 and 2 show a conventional battery connection body,
A is a plan view thereof, B is a cross-sectional view thereof, FIG. 3 is a perspective view before batteries are connected using a conventional connector, and FIG. 4 is a cross-sectional view showing a state in which conventional batteries are connected in series. , FIG. 5A is a plan view showing a connecting body of an assembled battery according to an embodiment of the present invention, FIG. 5B is a cross-sectional view thereof, and FIG. FIG. 7 is a sectional view showing the state in which the battery is connected. 1a, 1b...connection body, 2a, 2b...battery,
3...Metal cap, 4...Head, 5...Brim part, 6...Insulating plate, 7...Connection body, 8...Cylindrical peripheral part, 9...Concave part, 10...For gas venting groove,
11... Top cylindrical part, 12... Step part, 13...
Gap, 14...Ring-shaped liquid absorption plate.

Claims (1)

[Claims] 1 A plurality of cylindrical batteries 2a, 2b, a connecting body 7 that connects the batteries in series, and a ring-shaped liquid absorption plate 1
4, the battery includes a metal cap 3 with a built-in safety valve and a gas discharge hole, and a collar portion 5, and the connecting body 7 includes a top cylindrical portion 11.
and a concave portion 9 having a gas venting groove 10 on the bottom surface.
and a cylindrical peripheral part 8 having a stepped part 12 continuous to the periphery of the recessed part 9 are integrally formed.
The top cylindrical part 11 of the connecting body 7 is fitted into the metal cap 3 of one battery 2a, and the recessed part 9 is welded to the collar part 5 of the metal cap, An assembled battery characterized in that a cylindrical peripheral part 8 having a stepped part 12 of the body 7 is fitted and welded to the bottom of the case of the other battery 2b.