JPS62122053A - Multicell battery - Google Patents

Abstract

PURPOSE:To ensure contact with adjacent battery by forming a projection whose diameter is 30-70% of that of a cell and height is 10% or more of the cell height in at least one of positive and negative terminals of a flat type cell for a multicell battery. CONSTITUTION:A negative assembly is formed by fixing an insulating gasket 2 made of nylon in the circumference of a negative plate 1, filling a negative electrode 3 which is a mixture of a negative active material and a thickening agent inside the sealing plate 1, and pouring electrolyte comprising aqueous solution of potassium hydroxide and zinc oxide on the negative electrode 3. A positive assembly is formed by molding a mixture of mercuric oxide and graphite in a disk form to form a positive mix 4, and pressing the positive mix 4 against the bottom of a positive case 6 made of stainless steel with a nickel plated iron positive ring 5, then placing a separator 7 made of polyethylene and an absorbing material 8 made of nylon nonwoven fabric in order on the positive mix. The negative assembly is combined with the positive assembly, and the opening of the positive case is bent inward to seal a battery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a battery assembly formed by stacking a plurality of flat batteries.

Conventional technology In general, the output voltage of a battery is determined by the combination of active materials in its positive and negative electrodes, and among commonly used battery systems, lithium-based batteries that use organic electrolytes have the highest voltage. It was less than 3v. If you want to obtain a higher voltage than this, the only way to do this is to use several batteries in series, or to use an assembled battery made up of several batteries stacked in advance.

Problems to be Solved by the Invention However, in the former case, accidents are likely to occur due to mistakes on the part of the user, and the invention cannot be easily recommended, as it has the following disadvantages.

(1) Mixing different types of batteries @) Mixing new and old batteries, or partially exhausted batteries (3) Using some batteries in reverse when arranging them in series. Not only does this shorten the battery's lifespan, but in extreme cases it can leak, damaging equipment, or even explode, creating a dangerous situation.

For this reason, the latter type of battery pack is generally used. This battery assembly was constructed by a specialized manufacturer, and although there were no accidents like the one mentioned above, there were the following problems.

(4) The construction of an assembled battery requires extra parts and man-hours in addition to the original manufacturing of the unit cell, making it expensive. (5) The smaller the unit battery becomes, the more likely short circuits occur during construction. etc. can easily occur.

In the case of (4) above, the individual unit cells configured as an assembled battery should be protected from problems such as poor contact, deformation, disconnection, and short circuits due to vibrations and shocks received during movement and use of the assembled battery. , various measures are required. - For example, when connecting individual cells electrically using lead plates or other materials, an insulating ring is placed between the cells to prevent short circuits, and all cells are connected to form a uniform structure. After connecting, the outside was covered with a heat-shrinkable resin tube, and the outside was further covered with a resin or metal outer tube.

In the case of (5), the smaller the flat battery, the more
Since the distance between the end of the positive electrode case and the top of the sealing plate, which is the negative electrode terminal, is narrow, short circuits may occur if the battery is even slightly tilted or the lead plate is misaligned during construction. To prevent this, we spot-weld a dish-shaped metal to the negative terminal of each battery, and fit the positive electrode case of the other battery into the recess of the dish-shaped metal, or insulated between the individual batteries as described above. They used rings.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a battery assembly that can be easily assembled without causing any trouble during construction.

Means for Solving the Problem In order to solve this problem, the present invention provides at least one of the positive and negative terminals of a flat battery used in an assembled battery with a diameter of 30 to 70% of the diameter of the unit battery, and a total A convex portion having a height of 10 inches or more is provided.

Function: According to this configuration, stable contact can be obtained between adjacent batteries without using any extra parts when configuring an assembled battery. That is, the above (4), C5
), the convex diameter of the cell terminal is sufficiently large,
Also, since the height is sufficiently high, the batteries will not tilt when stacked on top of each other, and even if they are tilted a little, it will not lead to a short circuit. Therefore, there is no need to interpose an insulating ring between the batteries or use expensive dish-shaped metal plates for connections, making it easier to assemble the battery pack, and reducing costs because no unnecessary parts are used. Become cheap.

EXAMPLES Examples of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional view of a flat wet mercury cell as a unit cell used in the present invention. In the figure, 1 has a convex portion projecting outward, an insulating backing 2 made of nylon or the like is attached to the periphery, and the inner surface is coated with zinc hydride, which is the negative electrode active material, and a color thickener such as carboxymethyl cellulose. Negative electrode 3 which is a mixture
It is a sealing plate filled with. An electrolytic solution consisting of an aqueous solution of potassium hydroxide and zinc oxide is injected into this to form a negative electrode assembly. On the other hand, a positive electrode mixture 4 made of a mixture of mercury oxide and graphite molded into a disc shape is crimped to the bottom of a stainless steel positive electrode case 6, together with a positive electrode ring 5 made of nickel-plated iron with an inverted cross-section. polyethylene separator 7
, an impregnated material 8 made of nylon nonwoven fabric, and a positive electrode side assembly are prepared, the previous negative electrode side assembly is placed on top of the positive electrode assembly, and the end of the positive electrode case is curled inward to be sealed.

In the above configuration, the diameter of the convex portion of the sealing plate must be in the range of 30 to 70q6 relative to the battery diameter.

This is because if it is less than +30%, it will tend to tilt when stacking the batteries, and if it is more than 70%, it will be easy to short-circuit between the positive and negative electrode parts when attaching a lead plate, etc. Also,
The height of the convex portion must be at least IQ% of the total height of the battery.

This is also due to the same reason as mentioned above. In Figure 2, two unit cells A of the present invention are connected in series between the protrusion 9 of the lower battery and the bottom of the upper battery by a lead plate 1o. This is an assembled battery obtained by connecting the conventional unit cells B with a lead plate of 1° and an insulating ring 11 as shown in Fig. 3.
The effect can be clearly seen when compared with the conventional battery shown in FIG. All batteries are ordered by diameter 22.

Although the total height is 7.4H, when comparing only the convex portion 9 of the sealing plate, the battery A according to the present invention has a conical bottom diameter of 15 mm, an upper diameter of 10 mm, and a height of 1.2 mm. However, the conventional battery B has a diameter of 12 mm and a height of 0.3 mm. Third
In the figure, a lead plate 10 is used to connect the unit cells, and a thickness Q made of polystyrene resin etc. is used between the unit cells.
An insulating ring 11 of 111ff is interposed. Furthermore,
Heat-shrinkable resin film 12 made of polyvinyl chloride is attached to the side of the battery.
This increases the degree of bonding between the unit cells, and it is clearly seen that the number of parts is greater than that of Battery A of the present invention, and additional man-hours are required for assembly.

The assembled battery configured in this manner has an amplitude of 2111M.

Table 1 shows the results of a vibration test performed three times in directions perpendicular to each other at a frequency of 2000 Hz for 30 minutes.

Here, samples A and B are the aforementioned batteries, and sample C is a conventional battery configured without using the extra parts 11 and 12 like battery A of the present invention. The open circuit voltage and short circuit current of 100 samples are shown before and after the vibration test.

When we disassemble the batteries listed in Table 1 C, especially those with low voltage and current, we find that the cells are short-circuited through the lead plates, and the spot welds on the lead plates are about to come off. I also disassembled the A and H batteries for this purpose, but there were no such marks at all.

Effects of the Invention As described above, according to the present invention, when constructed as an assembled battery, the cost can be reduced, and an assembled battery that is resistant to vibrations and has stable characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a unit cell used in the present invention, FIG. 2 is a schematic diagram of an assembled battery constructed using the unit cells of the present invention, and FIG. 3 is a schematic diagram of an assembled battery constructed using conventional batteries. . 4... Sealing plate, 9... Convex portion of the sealing plate. Name of agent: Patent attorney Toshio Nakao and one other person

Claims (1)

[Claims] At least one of the positive and negative terminals has a diameter of 30 mm
An assembled battery consisting of a plurality of flat batteries stacked in series, each having a convex portion with a diameter of ~70% and a height of 10% or more of the total height.