JPS6226761A - Mutual connection of sealed alkaline battery - Google Patents

Abstract

PURPOSE:To reduce the internal resistance of an assembly battery produced by connecting sealed alkaline batteries in series by directly welding the positive terminal of a single battery to the negative terminal of another single battery. CONSTITUTION:After a single battery 6 such as a sealed alkaline battery is positioned on a support base 5, a welding electrode 9 supported by an electrode holder 8 is brought into contact with the lid 7 of the battery 6. After the negative terminal of another single battery 6' is placed on the projection 11 of the upper lid 10 of a safety-valve installation part which is welded to the lid 7 and also serves as a positive terminal, the battery 6' is supported by a welding electrode 9' also serving as a battery holder. After that, the positive and the negative electrodes are directly welded together by feeding a current while applying a proper pressure to connect the batteries 6 and 6' together. By the means mentioned above, many single batteries can be connected into an assembly battery without using any lead plate. Consequently, it is possible to significantly reduce the internal resistance of the assembly battery and to increase its performance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for connecting a plurality of sealed alkaline batteries to form a set of batteries (hereinafter referred to as "assembled battery").
The present invention relates to a method for interconnecting cells (hereinafter referred to as "cell cells") in series.

BACKGROUND OF THE INVENTION Conventional sealed two-cadmium batteries are used in electrical and electronic devices, and when used in these devices, about 2 to 10 single cells are connected in series to form a set. It is almost always used in the form of a so-called assembled battery. Therefore, naturally,
It is necessary to electrically connect the single cells to each other, and for this purpose, for example, method 1j as shown in FIG. 3 has been adopted. That is, the lead plate 4 made of a ribbon-shaped metal connects the upper lid 2 of the safety valve storage part, which also serves as the anode terminal of the unit battery 1, and the battery can 3', which also serves as the cathode terminal of the adjacent unit battery 1'.
It was connected with. Resistance welding is used to connect the lead plate 4 and the top cover 2 or battery can 3'.

Edict 3 is a battery can.

Problems to be Solved by the Invention Incidentally, as the demand for Ni-Cd batteries increases, what has recently been particularly required is an improvement in high-rate discharge performance.For example, when used in hand-held dust cleaners or power tools, etc. The battery is discharged at a current 10 to 20 times the nominal capacity of the battery.
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% IG Th< /l) The question is how long the discharge can be carried out. Various measures are necessary to meet such demands, and among these, one of the most important is how to reduce the internal resistance of the battery. One example is a multi-point current collection system that uses multi-tabs to collect current from a group of plates housed in a single cell. This concept of reducing the internal resistance of single cells must also be applied to assembled batteries in order to meet the above requirements. The problem at this time is how to connect the single cells to each other. The conventional method is shown in Figure 3, for example, 1200 mA.
In the case of a set of 10 SC size batteries of h, t O,L
A total of 9 Fe lead plates of 8 Xw 60X, g 25 mm will be used. Of the internal resistance of the assembled battery when it is actually made into a product, how much resistance is at the interconnection part of the cells by the lead plate as mentioned above? In the case of an SC type battery, there is a voltage drop of about 0.02V in 1OcrnA discharge (discharge with a current 10 times the nominal capacity). Therefore, it cannot be ignored when producing batteries that satisfy the requirements mentioned at the beginning.

Means to Solve the Problem Needless to say, the electrical resistance increases in proportion to the length, so when connecting the single cells in an assembled battery to each other, it is necessary to use the lead plate described above. The shorter the length, the better. The most preferable condition is to use a lead plate.
The top cover and the battery can of the adjacent battery are directly connected, and the present invention provides this type of connection technology as a means for lowering the internal resistance of the assembled battery.

Example FIG. 1 shows details of the invention.

In order to simplify the explanation, a case of a set of two single cell batteries is illustrated below, but even if the number of cells is large, the content described below can be repeated.

First, the hind limb cell 6 was positioned on the support stand 5.
The welding electrode 9 held by the lid 7z and the electrode holder 8i
Apply an appropriate pressure and bring them into contact with each other. Next, place the cell 6' on the top cover 10 welded to the cover 7 of the cell 6,
The cell 6' is held by a welding electrode 9' which also serves as a battery holder.

At this time, the cell 6 needs to be positioned so as not to come into contact with the electrode holder 8 or the welding electrode 9.

Further, the upper lid 10 is provided with a projection (protrusion) ll. As a result, the upper cover 10 and the battery can 1 of the cell 6'
This makes it possible to obtain a welded part with low air resistance at the contact surface with 2. When the positioning of both batteries is completed as described above, force is applied to the welding electrode 9' in the direction of the arrow, and the single battery 6' is pressed against the upper lid IO with sufficient pressure. When the pressure at this time reaches a predetermined value, welding m bud shallow Q Q/N old r
I'm off duty! Due to the warping of the four-pot eggplant, both members melt due to resistance heat generation at the contact surface between the upper cover 10 and the battery can 12 of the cell 6', and the cell 6 and the cell 6' are separated from each other as shown in FIG. Thus, the connection is made without requiring the μIJ-board 4.

The above has described the case where resistance welding is used in carrying out the present invention, but it is not necessarily limited to resistance welding, and any method that does not adversely affect the cell, that is, has a small thermal effect, can be used. no problem. For example, laser welding is one example. In this case, as shown in FIG. 2, a protrusion 13 is provided on the bottom of the battery can of the cell 6', and the contact surface between this and the top lid 10' is heated with laser beams. 14 to melt and weld. In this case, it is also necessary to connect the cells in a jig-deg arrangement as in the case of resistance welding.
Therefore, it is advantageous in terms of reducing the storage volume of the assembled battery.

Next, a case will be described in which the method for interconnecting single cells according to the present invention is applied to manufacturing a battery assembly made up of ten SCC battery packs. The battery can is 5PO with 3-4βm Ni plating.
It is made of O material and has a wall thickness of 0.4 tm. The upper lid is 4~
Carbon steel with 5μm Ni plating, wall thickness 0.5c
m, the diameter of the part to be welded was 72, and three projections with a height of 0.4- were formed here. Resistance welding is used for welding, and the material of the welding electrode is 10r-Ou.
The diameter of the welding electrode 9 is 4. Orm. The welding electrode 9' has a cross section of 8 x 15 m, and a part thereof is molded into a shape that matches the outer shape of the cell. Welding was carried out using an electrostatic energy storage type welding machine, but the applied force when energizing was 12
kp, the peak value of the welding current is 480OA, and the current application time (
The base time of the Varne waveform) is 8.3 m5.

The results of welding under the above conditions are shown in Table 1.

Table 1 The assembled battery shown in Table 1 above shows the assembled battery consisting of 10 SC type cells as described above, when assembled by the method according to the present invention and when assembled by the conventional method using a lead plate. The results of comparing the internal resistance and welding strength of the two are shown. As is clear from the results, in the case of the method according to the present invention, the internal resistance was reduced by 24 mΩ on average, and the welding strength was maintained at the same level as that of the conventional method.

Effects of the Invention As mentioned above, the present invention has great industrial value, such as being able to reduce the internal resistance of the battery.

[Brief explanation of the drawing]

Fig. 1 shows a method for interconnecting single cells according to the present invention, and is an explanatory diagram when laser welding is used as the welding method, and Fig. 3 is an explanatory diagram of a conventional method for interconnecting single cells. . 6. 6', 6' are single batteries, 10, t o' are upper lids, 12
is a battery can procedural amendment (voluntary) + V + Wa 6 Peace 1 year 147 6th Office - To Kan Uga Michibu 1 Incident indication 1985 Patent application
No. 1 @ No. 64 2 Title of the invention Method for interconnecting sealed alkaline batteries 3 Relationship with the case of the person making the amendment Patent Applicant Address 2-1-1-4 Nishi-Shinjuku, Shinjuku-ku, Tokyo
Column 1 of Detailed Description of the Invention in the Specification Subject to Amendment, Drawing 5 Contents of the Amendment (1) "Set as one set" in the second line of page 2 of the specification.
is corrected to ``one group.'' (2) "Ambition" in the 5th line of page 2 of the specification is replaced with "±"
I am corrected. (3) "Unit battery" in the 7th line of page 2 of the specification,
・Correct it to "cell battery." (4) 1 unit electric in line 8 of section 2'rC of the specification.''
is corrected as [unit weight - 1]. (5) “Gunpan group” in line 6 of No. 300 of the specification is “
I corrected it to ``electrode group''. (6) Replace "6" in line 8 of page 5 of the specification with [6'
] Correct. (7) [72+omJ on page 7, line 5 of the specification is corrected to [7,2mn+J. (8) Figure 1 is amended as shown in the attached sheet.

Claims (1)

[Claims] As an assembled battery consisting of a plurality of cells connected in series, there is a top cover of a safety valve housing that also serves as the anode terminal of the cells, and a battery can that also serves as the cathode terminal of the cells connected in series to the cell. A method for interconnecting sealed alkaline batteries characterized by direct welding.