JPS63105460A - Connecting cap for battery - Google Patents

Abstract

PURPOSE:To increase dimensional accuracy by radially extending two or more narrow tabs which are shorter than the height of a battery from the periphery of a substrate, bending them upward, and elastically holding the body of an upper battery. CONSTITUTION:An insulating ring 9 having the circumference dimension same as that of other electrode is placed on the other electrode of a lower battery 6. A terminal 10 of the other electrode is inserted into a central through hole 4 from the drawn bottom of a connecting cap 1, and the insulating ring 9 is placed between the lower surface of a connecting cap substrate 2 and the upper surface of the lower battery 6. The drawn bottom of the connecting cap 1 is connected to the other electrode surface of the lower battery 6. An upper battery 7 is reversely inserted into a plurality of bent tabs 5 of the connecting cap 1. The body of the upper battery 7 is elastically holded with the tabs 5 placed on the substrate 2, and the bottom surface of the upper battery 7 is brought into contact with the tip of the terminal 10 of the lower battery 6, and the tabs 5 are connected with the body of the upper battery 7. Thereby, welding job of the connection cap and the body is made easy and dimensional accuracy is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field This invention relates to a columnar battery, such as a cylindrical Ni-Cd battery.
[Regarding connection caps for connecting ponds etc. in series,
The connected batteries are used in battery packs for cordless power supplies, etc.

(Off) Conventional technology and problems As a connection cap for connecting cylindrical batteries in series, a saucer-shaped connection cap 21 shown in FIG. 4 has been commonly used. However, this cap has the following features. There is a problem.

1) Two cylindrical batteries 2 using dish-shaped connection caps 21
FIG. 5 shows a case in which 2 are connected in series in the vertical direction. As is clear from this figure, the thickness of the connection cap 21 increases in the vertical direction. Note that 23 in the figure
is an insulating ring.

II) In FIG. 5, the two batteries 22 are fixed by welding to the connection cap 21, but it is necessary to spot weld using a jig, and if the batteries are not used, bending will occur between the batteries. Problems arise with dimensional accuracy.

ii) FIG. 6 shows a case where cylindrical batteries 22 are vertically connected in series using a dish-shaped connection cap 21 and connected by a connection piece 23 to produce an assembled battery. As is clear from Fig. 6, a connection cap 21 is placed between the batteries in FA contact.
A gap of thickness t is created, which not only increases the size of the assembled battery itself, but also poses a problem in fixing adjacent batteries by using, for example, an adhesive to fix the batteries.

(/9 Means and operation for solving the problem This invention was made to solve the above problem. A cap for connecting batteries in series, the cap having a protruding other electrode and a conductive substrate having the same size and shape as the bottom surface of the battery, and narrowing the center part of the conductive substrate, and having a through hole in the center of the narrowed bottom surface. , the other terminal of the lower battery is inserted and fitted through the through hole in the squeezed bottom surface, and brought into contact with the bottom surface of one pole of the upper battery placed on the opposite side of the squeezed part of the board, and two or more narrow tabs shorter than the height of the battery at least from the total circumference of the substrate, extending radially;
This is folded upward to provide a battery connection cap which is formed with a column so as to elastically hold the body of the upper battery.

The connection cap of the present invention can be manufactured to match the bottom shape of a columnar battery, even if it is cylindrical or prismatic.

Furthermore, the connection cap of the present invention is generally used to connect two batteries in series in the following manner.

First, place an insulating ring on the other pole of the lower battery, the outer circumference of which is the same as the outer circumference of the other pole, and then insert and fit the other electrode terminal into the center hole of the connecting cap from the squeezed bottom surface, and place the insulating ring on the connecting cap board. It is interposed between the bottom surface and the top surface of the lower battery. Next, the constricted bottom surface of the connection cap and the other pole surface of the lower battery are connected by spot welding or the like. Next, the upper battery is inserted with the bottom side of one pole facing down into the plurality of tabs folded as described above in the connection cap, and placed on the upper surface of the cap substrate, so that the circle of the upper battery is elastically held by the tag. At the same time, the bottom surface of one pole of the upper battery is brought into contact with the tip of the other pole terminal of the lower battery. Each tab is then connected to the body of the upper battery by spot welding or the like. Therefore, the through hole on the bottom of the constriction is made large enough to fit the other terminal of the battery to be connected, and the depth of the constriction is determined between the other pole of the lower battery and the bottom of the constriction, as described above. The two electrodes are connected by welding or the like, and the other electrode is manufactured to a depth such that the tip of the terminal comes into contact with the bottom of the upper battery.

As long as these conditions are satisfied, the shape of the constriction part may be any shape.

Note that two or more tabs are required to fix the upper battery, but especially when producing an assembled battery, the tabs are used to bring adjacent batteries into contact (see Figures 3a and 3b). The number, width, spacing, etc. of the tabs are appropriately selected depending on the type of battery so as not to impede this contact.

B) Embodiments This invention will be explained by embodiments shown in the drawings, but the invention is not limited thereto.

FIG. 1a is a perspective view of a connection cap 1 according to an embodiment of the present invention, and FIG. 1b is a longitudinal cross-sectional view of FIG. 1a, which is used for connecting cylindrical batteries.

In the above figure, 2 is a connecting cap board, 3 is a constricted portion of the board 2, 4 is a through hole, and 5 is four rectangular tabs, which are folded inward at an angle α.

FIG. 2a is a side view showing a state in which two cylindrical batteries [upper battery: C battery 7 and lower battery 2 BE batteries 6] are connected using the connection cap l, and FIG.
It is an enlarged view of part A of the figure.

Using the connection cap 1 described above, a cylindrical battery is connected as follows.

First, place the insulating ring 9 on the anode flap surface 8 of the Bq battery, and then place the anode terminal 10 of the Bq battery on the anode flap surface 8 of the Bq battery.
It is inserted and fitted into the central through hole 4 of the constricted bottom surface 3 of the connecting cap 1 shown in Figures 1 and 1b. At this time, the positions of the anode terminal 1o of battery B and the through hole 4 of the connection cap can be easily specified by allowing the cap to fall naturally. Next, in the case of the anode, since the connection cap 1 is firmly held in the B [pool 6], spot welding work is not only easy but also bending is reduced and dimensional accuracy is improved.

Next, the bottom of the Cm battery is inserted between the four folded tabs 5 of the connection cap 1 and placed on the cap substrate 2, and at the same time, the tip surface 13 of the anode terminal 10 is inserted into the cathode bottom surface 1 of the C battery 7.
2. In this case, the tab 5 is bent inwardly as shown in FIG. 1a, so that the C battery 7 is firmly and elastically held by the tab 5.

Not only is it easier to install, it also reduces bending and improves dimensional accuracy.

In the above manner, battery B and battery C are electrically connected.

In the above B-C battery connection, the tip surface 13 of the anode terminal 10 of the B battery can be brought into contact with the cathode bottom surface 12 of the C battery 7. There is no increase in vertical dimension.

In addition, in the case of conventional dish-shaped connection caps, series spot welding is required, which increases reactive current, so that only those with a thickness of 0.15 to 0.2 Jfl can be spot welded. On the other hand, in the above embodiment, the connection cap has a through hole, and the spot welding electrode can be brought into contact with the tip end surface of the anode terminal through the through hole, so that indirect spot welding is possible. Therefore 0.3~0
．． Welding is possible even with a thickness of about 411 mm, and the battery connected in the above manner can provide excellent effects when used for high-rate discharge applications (tools, conceit, etc.), for example.

An assembled battery 15 manufactured by connecting four sets of two batteries connected as described above is shown in FIG. 3a (side view) and FIG. 3b (plan view). Note that 16 in the figure is a connecting member.

If the batteries are assembled as shown above, what about the adjacent batteries? 9i
Because of this, there is no gap like in the conventional assembled battery using a dish-shaped connection cap as shown in Fig. 6, and it is not only easy to fix with adhesive or other means, but also to be smaller in size. can.

(E) Effects of the Invention According to the connection cap of the invention, the following effects can be obtained.

1) When connecting batteries vertically in series using this connection cap, it is easy to set the position of each πL cell, and since it is firmly held, welding between the connection cap and the battery is easy, and the dimensional viscosity is will improve.

■) Using a connection cap does not increase the volume in the vertical direction.

I) Since indirect spot welding can be used to weld the connection cap and battery, thick connection caps can be used. Therefore, excellent effects can be obtained, for example, in applications corresponding to 1 ylate discharge.

IV) When batteries connected in series in the vertical direction are connected in the horizontal direction to form an assembled battery, there is no gap between adjacent batteries, so the batteries can be easily fixed to each other and have high dimensional accuracy.

[Brief explanation of the drawing]

Fig. 1a is a perspective view of a connection cap according to an embodiment of the present invention, Fig. 1b is an illustrative longitudinal cross-sectional view of the 18th cross section, and Fig. 2a is f
Figure 2b is an enlarged view of section A in Figure 2a, and Figure 3a is a battery made using the connected battery in Figure 2b. Fig. 3b is a plan view of the assembled battery shown in Fig. 3a, Fig. 4 is a perspective view of a conventional connection cap, and Fig. 5 shows how two batteries are connected using the connection cap shown in Fig. 4. FIG. 6 is a side explanatory view showing a connected state, and FIG. 6 is a perspective view of a set wL pond manufactured using the connected batteries of FIG. 5. 1.21... Battery connection cap, 2... Connection cap board, 3... Squeezed part, 4...
...Through hole, 5...Tab, 6...Lower battery, 7...Upper battery, 8...Lower battery terminal flap surface, 9.23...Insulation ring, 10... Anode terminal, 11
．． 14... Spot welded portion, 12... Cathode bottom surface of upper battery, 13... Tip surface of anode terminal. t',,('i)'::...°・;. Figure 3b Figure 1a Figure 2a Figure 1b Figure 2b

Claims (1)

[Claims] 1. A cap for connecting in series batteries that are columnar and have one pole with a substantially flat bottom and the other pole with the other pole terminal protruding from the center of the top, the same size as the bottom of the battery. The center part of the conductive board shaped like a bell is squeezed, a through hole is provided in the center of the bottom of the narrowed part, and the other terminal of the lower battery is squeezed and inserted and fitted through the through hole in the bottom of the narrowed part. The base plate is brought into contact with the bottom surface of one pole of the upper battery placed on the opposite side of the recessed part, and furthermore, two or more narrow tabs, which are at least shorter than the height of the battery, are extended radially from the periphery of the substrate. A battery connection cap configured to be folded upward to elastically hold the body of an upper battery.