JPH064534Y2 - Battery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a battery device, and more particularly to improvement of a conductive plate used when connecting a plurality of batteries in series or in parallel.

(B) Conventional technology When batteries are connected in series or in parallel, a plate-shaped conductive plate is generally spot-welded to the terminals of the battery to make the connection.

In recent years, the battery device thus obtained is housed in a resin case as described, for example, in Japanese Utility Model Publication No. 63-10624, and is widely used as a battery pack for portable video cameras, electric tools and the like. Has reached. Here, due to high-rate discharge, rapid charging, etc., the current flowing through the battery increases, and it is becoming necessary to have a large resistance to the conduction of the conductive plate.

Therefore, it is conceivable to increase the width of the conductive plate in order to improve the electrical performance of the conductive plate, particularly the current capacity.
However, this makes the workability worse,
For example, in the case of a commonly used nickel-cadmium battery, if a conductive plate with a width larger than the width of the convex anode terminal protruding at one end of the battery is used, the conductive plate may protrude from the anode terminal, causing a risk of short circuit, etc. Sexuality occurs. Therefore, it is necessary to use a conductive plate having a width substantially equal to that of the anode terminal. Also, if the thickness of the conductive plate is simply increased, when spot welding the conductive plate to the terminals of the battery, the reactive current during spot welding increases in the welding part of the conductive plate and sufficient welding strength is obtained. Absent. As a method for reducing the reactive current, it is possible to make a slit (slit) in the longitudinal direction of the conductive plate as shown in Japanese Utility Model Publication No. 49-6498, but this method also has a limit on the plate thickness. .

(C) Problems to be solved by the present invention The present invention has been made in view of the above-mentioned problems, and has a simple structure, which does not impair the workability and spot welding strength of a conductive plate for connecting batteries. It is intended to improve the current capacity.

(D) Means for Solving the Problems The battery device of the present invention comprises a plurality of batteries and a conductive plate, wherein the conductive plate is plate-shaped, and the conductive plate has a welded portion and a conductive portion. And the welded portion is welded to a terminal of the battery, and the conductive portion conducts electricity between the batteries,
Further, the conductive portion is composed of a conductive base and a conductive auxiliary plate, and the conductive auxiliary plate is bent toward the conductive base.

(E) Operation According to the configuration of the present invention, the welding strength between the battery and the conductive plate can be sufficiently obtained without lowering the workability, and the current capacity of the conductive plate can be improved.

(F) Example The present invention will be described in detail with reference to the drawings.

(Reference Example) FIGS. 1, 2, 7, and 8 show reference examples which are the premise of the present invention. Reference numeral 1 denotes a conductive plate, which includes a welded portion 2 and a conductive portion 5. Further, the conductive portion 5 is composed of a conductive substrate 3 and a conductive auxiliary plate 4 (see FIG. 2).
The conductive substrate 3 and the conductive auxiliary plate 4 are separate plate-shaped members. The conductive auxiliary plate 4 is spot-welded and fixed to the conductive substrate 3 at four spot welding points (6, 6, 6, 6 in FIG. 1). Here, the conductive auxiliary plate 4 and the conductive substrate 3 have the same plate thickness and substantially the same cross-sectional area.

On the other hand, as shown in FIGS. 7 and 8, the welded portion 2 is spot-welded to the terminals 8 and 9 of the battery 10, but the slit 7 for reducing the reactive current during welding
Are formed.

Now, in the conductive plate 1 thus obtained, the plate thickness of the conductive portion 5 is double that of the welded portion 2 due to the increase of the plate thickness and the sectional area of the conductive auxiliary plate 4. Therefore, even when the battery 10 is used for high rate discharge, rapid charge, etc., there is no problem because the current capacity of the conductive plate is large.

However, in the case of this reference example, since the conductive plate 1 is composed of two members, that is, the conductive base 3 and the conductive auxiliary plate 4, there is a problem that the number of parts increases and the number of assembling steps increases.

(First Embodiment) FIGS. 4 to 6 show a first embodiment of the present invention.
The difference between the first embodiment and the above-described reference example is that the conductive plate is composed of one metal plate. That is, the conductive auxiliary plate 24 is integrally formed so as to project from the conductive substrate 23. The conductive auxiliary plate 24 is bent toward the conductive substrate 23 to form the conductive portion 25 (see FIGS. 5 and 6).
It is understood from FIGS. 5 and 6 that the plate thickness and the cross-sectional area of the conductive portion 25 are approximately twice the plate thickness and the cross-sectional area of the welded portion 22.

As described above, the conductive plate according to the first embodiment of the present invention can increase the thickness of the conductive portion 25 more than the thickness of the welded portion 22 with a very simple structure. It is possible to make the spot welding robust and to ensure a current capacity of the conductive portion 25 that can withstand charging and discharging of the battery 10 due to a large current.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. The difference from the first embodiment is that the conductive auxiliary plate 24 has four spot welding points (26, 26, 26, 26 in FIG. 3) on the conductive substrate 23.
It is a spot welded and fixed point. With this structure, the conductive plate 21 having better electric characteristics than the conductive plate of the first embodiment can be obtained.

(G) Effect of the Invention As described above, according to the battery device of the present invention, the battery is composed of a plurality of batteries and a conductive plate, and the conductive plate is plate-shaped, and the conductive plate has a welded part and a conductive part. With department. The welded portion is welded to the terminal of the battery, the conductive portion conducts electricity between the batteries, and the conductive portion includes a conductive base and a conductive auxiliary plate, and the conductive auxiliary plate is bent toward the conductive base. Since it is characterized by being bent, two characteristics of the welded portion maintaining the strength of spot welding with the battery and the conductive portion improving the current capacity are provided in one conductive plate. You can easily get from.

[Brief description of drawings]

1, 2, 7, and 8 are reference examples on which the present invention is based, FIG. 3 is a second embodiment of the present invention, and FIGS. 4 to 6 are the first embodiment of the present invention. An example is shown. Figures 1 and 3
5 and 5 are overall perspective views of the conductive plate, FIG. 2 is an exploded view of the conductive plate of FIG. 1, FIG. 4 is a developed view of the conductive plate of FIG. 5, and FIG. 6 is A of the conductive plate of FIG. FIG. 7 is a side view when a battery device is constructed using the conductive plate of FIG. 1, and FIG. 8 is a view seen from the upper surface of FIG. 7. 1, 21 ... Conductive plate, 2, 22 ... Welded part, 3, 23 ... Conductive substrate, 4, 24 ... Conductive auxiliary plate, 5, 25 ... Conductive part, 6, 26 ... Spot welding point, 7, 27 ... Slit, 8, 9 ... Terminals, 10 ... Battery.

Claims (1)

[Scope of utility model registration request] 1. A battery comprising a plurality of batteries and a conductive plate, the conductive plate having a plate shape, the conductive plate having a welded portion and a conductive portion, and the welded portion being a terminal of the battery. And the conductive portion is electrically connected between the batteries, and the conductive portion includes a conductive base and a conductive auxiliary plate, and the conductive auxiliary plate is bent toward the conductive base. Battery device to do.