JPH0527801Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a battery pack, and more particularly to a battery pack in which a plurality of horizontally arranged battery groups are stacked vertically in multiple stages.

BACKGROUND ART In recent years, demand for battery packs has been increasing mainly in the video industry, particularly in the field of portable video cameras, as they play a part in the design or function.

Hereinafter, a conventional battery pack will be explained with reference to the drawings.

FIG. 5 shows a conventional battery pack.
In the figure, reference numeral 1 denotes a cylindrical battery, which constitutes a battery group A by arranging the batteries in a horizontal direction with their outer peripheral surfaces adjacent to each other. Reference numeral 2 denotes an insulating plate made of fiber or the like placed on top of the battery group, which has the function of preventing a short circuit from occurring between the battery group B placed above and the battery group A. be. 3 is a connection plate for making electrical connections between batteries, etc.
It is fixed by spot welding etc. 4 is the upper case,
Reference numeral 5 denotes a lower case, which is used to cover and store the assembled battery consisting of battery group A, battery group B, and insulating plate 2 from above and below. They are fixed together to form a battery pack.

Problems to be Solved by the Invention However, with the above configuration, the following problems occur when the batteries are housed in the upper and lower cases due to the non-uniform diameter dimensions of the batteries.

FIG. 6 is a diagram showing the state of the casing when batteries 1 with the largest diameters are mixed together. Moreover, FIG. 7 is a diagram when batteries 1 having the smallest diameter are mixed. For example, in Fig. 6, the diameter average value E + maximum value F + insulating plate thickness G > casing internal dimension H of battery 1;
In the figure, E + minimum value I + G < casing internal dimension H
The relationship will be established. Therefore, in Fig. 6, it is no longer possible to reliably butt the upper and lower cases together. A gap C is created between the upper and lower cases, and conversely a gap D is created inside the case in Figure 7, causing the battery to rattle inside the case and causing problems such as disconnection of the connection plate that electrically connects the batteries. The problem was that malfunctions could occur.

Therefore, an object of the present invention is to provide a battery pack that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the battery pack of the present invention has a plurality of cylindrical batteries placed side by side in the horizontal direction so that the outer peripheral surfaces of adjacent batteries are in contact with each other. In a battery pack configured by vertically stacking a plurality of battery groups, and storing these stacked battery groups in upper and lower cases, an elastic insulating plate is disposed between the upper and lower battery groups, and When these upper and lower battery groups are offset from each other in the width direction of the batteries within a dimension range of 1/2 or less of the battery diameter, and the inside dimension between the upper and lower cases of the upper and lower cases is set such that the battery with the minimum diameter is housed. The dimension between the top and bottom surfaces of the battery group is made to match.

Effect In the above configuration, when the battery group is composed of batteries having the minimum diameter, the upper and lower cases cover the battery group without any gaps. In addition, when a battery group is composed of batteries whose diameter is the maximum dimension, the positions of the upper and lower battery groups are shifted in the width direction, so by applying force to the upper and lower cases, it is possible to place the upper and lower battery groups in between. The insulating plate flexes along the outer circumference of the battery, allowing the end surfaces of the upper and lower cases to be perfectly aligned.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a partially cutaway front view of the battery pack. Reference numeral 11 denotes a cylindrical battery, which constitutes a battery group J by arranging them horizontally with their circumferential outer surfaces, that is, their long sides, adjoining each other. 12 is an insulating plate (insulating plate) with an elastic restoring force made of fibers, etc. placed on top of the battery group J, and a dimension S of less than 1/2 of the battery diameter is shifted horizontally on top of it. It has a function of preventing a short circuit from occurring between the battery group K and the battery group J placed in the same condition. Reference numeral 13 denotes a connecting plate for electrically connecting the batteries 11 and 11, and is fixed by spot welding or the like. 14 is the upper case, 15
1 is a lower case, and battery groups J and K are used to cover and house assembled batteries made up of insulating plates 12 from above and below. These upper case 4 and lower case 5 are fixed to each other by ultrasonic welding, adhesion, or screw fixation, and constitute a battery pack. Note that the description will be made using the partially enlarged view of FIG. 2 as a design dimension standard. The dimension standard is based on the minimum dimension L in the variation range of battery diameter dimensions, and is related so that dimension L x 2 + insulation plate thickness M ≥ casing internal dimension N when the upper and lower cases are properly combined. .

Regarding the battery pack configured as above,
The operation will be explained below with reference to partially cutaway front views of FIGS. 2, 3, and 4. As shown in Figure 2, in the combination of the minimum battery diameter dimensions,
Since the relationship is such that battery diameter L x 2 + insulation plate thickness M = casing internal dimension N, the gap formed between the upper case 14 and lower case 15 and the gap formed inside the upper and lower cases 14 and 15 are as follows. It is now in a state where it does not occur. Next, in the combination of maximum battery diameter dimensions,
As shown in Figure 3, the related dimensions are battery diameter R x 2 + insulating plate thickness M = casing internal dimension N + gap T between the upper and lower cases, and a gap T occurs between the upper and lower cases, but pressure is applied in the vertical direction as it is. , gaps P are formed between the batteries 11A and 11B and the insulating plate 12 at the center position u of the displacement dimension S.
and Q are tightened, and the insulating plate 12 is deformed (deflected) in the state shown in Figure 4, functioning as a cushioning material, and the gap T formed between the upper and lower cases disappears, allowing normal storage. The situation will be ensured. In addition, the shift dimension S between battery group J and battery group K in this case is the gap T created between the upper and lower cases ≦Batteries 11A and 11B.
Gap P+ formed between the insulating plate 12 and
It is necessary to shift by a dimension that makes Q.

As described above, by shifting the horizontal position of the battery groups by the required dimension, a gap is formed between the upper and lower battery groups and the insulating plate at the center position of the shifted dimension, and the force applied from above and below is By acting as a deflection buffer for the gap, variations in battery diameter can be absorbed.

In the above embodiment, the case where the battery groups are stacked in two layers, upper and lower, has been described, but the present invention can also be applied to a case where the battery groups are stacked in three or more layers.

Effects of the invention As described above, according to the invention, an elastic insulating plate is arranged between the upper and lower battery groups, and the upper and lower battery groups are connected within a size range of 1/2 or less of the battery diameter. Since the batteries are offset from each other in the width direction, and the internal dimensions between the top and bottom of the upper and lower cases match the dimensions between the top and bottom surfaces of the battery group when the battery with the minimum diameter is housed, unevenness in the diameter dimensions of the batteries is avoided. Even when the battery is warm, the insulating plate is bent by being pressed by the upper and lower cases, and the battery can be completely housed in the upper and lower cases.

[Brief explanation of the drawing]

Fig. 1 is an overall partially cutaway front view of a battery pack according to an embodiment of the present invention, Figs. 2 to 4 are partially cutaway views for explaining the same, and Fig. 5 is a conventional battery pack. FIG. 6 and FIG. 7 are partially cutaway views for explaining the entire front view with a part cut away. 11...Battery, 12...Insulating plate, 13...
...Insulating plate, 14...Upper case, 15...Lower case.

Claims (1)

[Scope of utility model registration request] A battery group consisting of multiple cylindrical batteries arranged horizontally so that the circumferential outer surfaces of adjacent batteries are in contact with each other is stacked vertically in multiple stages, and these stacked battery groups are stored in upper and lower cases. In this battery pack, an elastic insulating plate is arranged between the upper and lower battery groups, and the upper and lower battery groups are connected within a size range of 1/2 or less of the battery diameter. A battery pack in which the upper and lower cases are offset from each other in the width direction of the batteries, and the inner dimension between the upper and lower surfaces of the upper and lower cases matches the dimension between the upper and lower surfaces of the battery group when a battery with the minimum diameter is housed.