JPH0314778Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Fields This invention relates to a battery assembly in which a plurality of button-type batteries are housed in a single outer case.In particular, the present invention relates to a series battery group in which unit cells are stacked vertically, and a group in which unit cells are stacked horizontally. The present invention relates to an improvement of an assembled battery having horizontally oriented unit cells. Conventional structure and its problems Figure 1 shows the typical structure of an assembled battery so far.
Shown in Figure 2. This battery assembly consists of a series unit cell group x, a horizontal unit cell group y, an exterior can 2, a terminal plate 5 that closes the upper opening of the can, a bottom plate 8 that closes the lower opening of the can 2, and an insulating sheet. 10, the battery having:
The series unit cell group x and the horizontal unit cell group y are housed in parallel in the exterior can 2. The series unit cell group x is made up of button-type unit cells 1a to 1d stacked vertically, and has stainless steel dish-shaped caps 9a to 9.
After spot welding between the unit cells via c,
A resin tube 3 covers everything other than the terminal surface. In the horizontal unit cell group y, unit cells 1 are placed in holes 4a to 4b of a rectangular insulating spacer 4 made of thermoplastic resin.
e and 1f are held horizontally. The insulating spacer 4 is designed to insulate the inserted unit cells and to maintain dimensional balance according to the height of the series unit cell group x. The terminal plate 5 is made of insulating synthetic resin, and has a positive terminal 6 and a negative terminal 7 fixed from the inside by caulking with eyelets. 9d, 9e, 9f, 9g are lead plates made of nickel, and the lead plates 9d, 9e are unit batteries 1d.
and 1e, and are spot welded to the terminal surfaces of each unit cell so as to connect the unit cells 1e and 1f in series. In addition, the lead plate 9f is connected to the unit battery 1f and the negative electrode terminal 7.
The lead plate 9g connects the unit cell 1a and the positive terminal 6, one end of which is spot welded to the terminal surface of the battery, and the other end fixed to the terminal 6 or 7 by caulking. The insulating spacer 4 has a small hole that exposes the negative terminal surface of the battery on the side opposite to the battery insertion side of the holes 4a to 4b that hold the battery, and also has a cutout for inserting the ends of the lead plates 9d and 9e. It has a flaw. 10 is an insulating sheet made of kraft paper, and unit cells 1e and 1f exposed on the surface of the insulating spacer 4 are
negative terminal surface and lead plate 1 connected to these
This prevents the parts e and 1f from coming into direct contact with the outer can 2 and being shot. This insulating sheet 10 is
Its upper end is fixed to the terminal plate 5 together with the lead plate 9f. What is important for assembled batteries with this type of structure is that no shortening or leakage occurs due to electrical contact between the unit cells, or between the unit cells and the outer can, or between the connecting terminals inside the outer can. .
FIG. 3 shows an enlarged sectional view of the terminal board side. 11
a, 11b is a terminal board with a lead plate and insulating paper, positive,
A stainless steel eyelet for fixing the negative terminal. However, a drawback of this structure is that the peripheral edge of the eyelet on the negative electrode side and the peripheral edge of the positive terminal side of the series unit cell group tend to come into contact with each other. A group of series unit cells is insulated to a certain extent by resin tubes except for the terminal surfaces, but there are risks such as drop shock and vibration that occur when curling and sealing the outer can or when importing the batteries after assembly. When force is applied,
The disadvantage is that the resin tube in contact with the eyelet is easily torn and shoots occur. Purpose of the invention The present invention eliminates the above-mentioned conventional drawbacks,
An object of the present invention is to provide an assembled battery that does not generate shock or vibration. Structure of the invention In the invention, the surface of the caulked part of one of the positive and negative terminals is covered with an insulating sheet. For example, the insulating sheet fixed to the eyelet on the negative terminal side is further extended in the direction of the positive terminal, and after crimping with the eyelet, the insulating sheet extending toward the positive terminal is folded back into a U-shape. This covers the surface of the eyelet on the negative terminal side. As a result, there is a gap between the eyelet on the negative terminal side, which causes shoots, and the peripheral edge of the positive terminal of the series battery group.
Since the insulating tube and the insulating sheet are present, the insulation between them is maintained even against shock and vibration, and shoots do not occur. DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described. Although the enlarged sectional view of FIG. 4 shows a state in which the eyelet on the negative electrode terminal side is covered with an insulating sheet, the other structure is the same as that of FIG. 2. In order to assemble a series unit cell group, which will be described with reference to a battery assembly using button-type mercury cells as unit cells, first, four unit cells 1a to 1d are connected by spot welding using caps 9a to 9c. A heat-shrinkable tube 3 made of polyvinyl chloride is placed over the tube, and heat is applied to shrink the tube to completely seal the tube except for the positive and negative terminal surfaces of the unit cell at both ends. The configuration of the horizontal unit cell group is as follows: unit battery 1
After fitting e and 1f into the insulating spacer 4 so that the negative terminal surface is on the side of the outer case, a piece of stainless steel with a width of 3 mm and a thickness of 0.1 mm is spot-welded to the side of the case, which is the positive terminal of the unit cell 1f. The manufactured lead plate 9f is spot welded to the negative terminal surface of the unit cell 1e. The four and two cell groups thus produced are attached to the terminal plate 5 by spot welding to the lead plates 9g and 9f, respectively, which have been previously connected to the positive terminal 6 and the negative terminal 7. In addition, the negative terminal surface of the unit cell 1d, which is the other terminal, and the unit battery 1
The side surface of the positive electrode case e is also fixed by spot welding using the lead plate 9d. This creates a series circuit of six batteries. Reference numeral 10 denotes an insulating sheet which has been caulked and fixed to the negative electrode terminal 7 in advance with an eyelet, and is folded back in a U-shape to cover the caulked portion to prevent contact between the unit cell 1a and the eyelet 11a on the negative electrode terminal side. This is inserted from the terminal plate 5 into the outer can 2 in which one of the upper opening peripheral edges has been curled inward. Thereafter, a lid is placed on the bottom plate 8 made of polyvinyl chloride, and the peripheral edge of the opening is curled inward to seal the opening. In this way, an assembled battery is completed. The material of the insulating sheet 10 is kraft paper, and its dimensions are adjusted in advance so that it covers the eyelet of the negative electrode terminal when folded. The following table shows the number of shots generated when an assembled battery is dropped from a height of 1.2 m.

[Table] From these results, it is clear that the product of the present invention is superior. Effects of the invention As can be seen from the results in the table, the assembled battery of the invention has better drop impact resistance than conventional products, and no shoots occur.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are a perspective view, a cross-sectional view, and an enlarged cross-sectional view, respectively, of typical conventional assembled batteries, and Figure 4 shows an insulating sheet of an assembled battery in an embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view showing a state in which the caulked portion of the negative electrode terminal is covered. 1a, 1b, 1c, 1d, 1e, 1f...Battery, 2...Exterior can, 3...Insulating tube, 4...
Insulating spacer, 5...Terminal board, 6...Positive terminal,
7... Negative terminal, 8... Bottom plate, 9a, 9b, 9c
... Cap, 9d, 9e, 9f ... Lead plate,
10... Insulating sheet, 11a, 11b... Eyelet, x... Series unit cell group, y... Horizontal unit cell group.

Claims (1)

[Claims for Utility Model Registration] Exterior can 2, series unit cell group x, horizontal unit cell group y, terminal plate 5, bottom plate 8, and insulating sheet 10
The series battery group x includes a plurality of button-type battery cells 1a to 1a.
1d are stacked vertically to form dish-shaped caps 9a to 9c.
The unit cells are welded together through the insulating tube 3, and the parts other than the terminal surfaces are covered with an insulating tube 3.The horizontal unit battery group y has unit cells 1e to 1f placed horizontally in the holes 4a and 4b of the rectangular insulating spacer 4. The terminal board 5 is made of insulating synthetic resin, the positive terminal 6 and the negative terminal 7 are fixed by caulking, and the insulating sheet 10 is fixed by caulking together with one terminal. The series unit cell group x and the horizontal unit cell group y are housed in parallel in the can 2 and are electrically connected in series. , the terminal plate 5 closes the top opening of the can 2, and
Negative terminals 6 and 7 are connected to the battery group terminals 9
g, 9f, and the bottom plate 8 closes the bottom opening of the can 2.