JPS5928949B2 - assembled battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an inter-battery spacer for a battery pack used in electric vehicles, forklift trucks, etc., in which a large number of storage batteries are housed in an iron box or the like.

When a large number of storage batteries (hereinafter simply referred to as batteries) are housed in an iron box or the like, the biggest problem is heat dissipation from the batteries placed in the center.

Batteries experience a temperature rise at the end of charging and due to large current discharge, but excessive temperature rises have a negative effect on battery life.

Therefore, for applications where temperature rise is a problem, cardboard-like resin inter-battery spacers (as shown in Figures 1a and bJtC) having multiple hollow sections in the height direction have been used.
A spacer (hereinafter simply referred to as a spacer) was used to suck air through a duct from above the battery and replace the air in the spacer's hollow area, helping the battery to dissipate heat. On the other hand, from the viewpoint of battery life performance, it is better to press the electrode plates when using the battery, regardless of whether it is a paste type battery or a clad type battery, and this is especially noticeable in a paste type battery. This is to prevent the active material from falling off the lattice of the anode plate of paste type batteries, and to suppress excessive expansion of the active material of the cathode plate of paste type and clad type batteries. However, in the case of assembled batteries using spacers as described above, although they are sufficiently effective in dissipating heat, they tend to deform when the battery swells during use, lack the effect of compressing the electrode plates, and shorten its lifespan. There was a problem.

The present invention eliminates the above-mentioned conventional drawbacks, and provides an assembled battery that does not deform during use and is equipped with a spacer that can sufficiently dissipate heat from the battery. That is, in the present invention, the spacer has a structure in which resin rods are inserted into some of the hollow portions of a cardboard-shaped spacer having many hollow portions in the height direction, or resin is poured into the spacer to fill the spacer. The portion filled with the resin rod or the like suppresses swelling of the battery, and the unfilled hollow portion helps heat dissipation from the battery. Hereinafter, the present invention will be specifically explained using the drawings.

Figure 1 a, b is an example of a spacer that was used in the past.A folded sheet 3 is inserted between sheets 1 and 2 of thick polyethylene, polypropylene, etc. , which is manufactured by attaching the joint surfaces of the sheet 3 and the sheets 1 and 2 by thermal welding, adhesive, etc., and has a cardboard-like structure with many hollow parts 4 in the height direction.This spacer: It is used with the hollow part 4 in the vertical direction,
The air inside the hollow part 4 is warmed by the heat radiation of the battery, and due to the temperature difference with the outside, it replaces the outside air, helping the battery to dissipate heat.

Moreover, when the air is sucked from the upper part of the battery through a duct, fresh air is forcibly sucked in from the lower part of the hollow part 4 of the spacer, and an even greater heat dissipation effect is exhibited.

However, the spacer having the hollow portion is easily deformed due to the swelling of the battery. FIG. 2 shows the relationship between the swelling of the battery and the deformation of the spacer.

The spacer 6 between the batteries 5 has a thickness shown by the broken line in the initial stage, but as the battery swells during use, it deforms into the shape shown by the diagonal line, which has an adverse effect on battery life.
In order to prevent the spacer from deforming as described above,
In an embodiment of the present invention shown in FIG. 3, the same reference numerals as in FIG. 1 are the same.

The shaded part 7 is a resin rod inserted into the hollow part, and has a shape that matches the shape of the hollow part 4 in the spacer as shown in Figure 4, and is made of hard vinyl chloride or the like. Made of resin.

Further, the resin rods 7 are inserted into some of the hollow parts 4 as shown in FIG.

Note that the position of the hollow portion into which the resin rod 7 is inserted may be appropriately selected depending on the size of the battery used. When this embodiment of the present invention is inserted between batteries, the swelling of the battery is suppressed in the hollow part into which the resin rod 7 is inserted, and heat dissipation from the battery is carried out in the hollow part in which the resin rod 7 is not inserted. This can prevent adverse effects on the life of the battery.

In the above example, a case was shown in which resin rods were inserted into some of the hollow parts of the spacer to fill some of the hollow parts, but the following method without using resin rods was shown. Some of the hollow parts may be filled with.

Fill the lower parts of some of the hollow parts of the spacer with rubber plugs, fillers, etc., and fill the upper parts of the hollow parts with thermoformable molten resin or thermosetting resin such as epoxy, which has a melting point lower than that of the spacer. Pour and harden.

As described above, according to the present invention, it is possible to provide an assembled battery equipped with a spacer that can prevent battery swelling and sufficiently dissipate heat from the battery. It's big.

[Brief explanation of the drawing]

Figures 1a and 1b are a plan view and a side view showing an example of a conventional spacer between batteries, Figure 2 is an explanatory diagram showing the relationship between battery swelling and deformation of the spacer between batteries, and Figure 3 is a FIG. 4 is a plan view showing an embodiment of the inter-battery spacer used in the assembled battery of the present invention, and FIG. 4 is a perspective view of a resin rod inserted into the hollow space between the batteries shown in FIG. 3. 4...Hollow part, 7...Resin rod.

Claims (1)

[Claims] 1. An inter-battery spacer constructed by inserting resin rods or pouring resin into some of the hollow parts of a cardboard-shaped resin spacer having many hollow parts in the height direction. assembled battery.