JPH10106534A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the discharging voltage characteristic at the time of efficient discharging, and to prevent the absorption of adhesive agent to a separator and electrodes at the time of filling the adhesive agent so as to stabilize the battery capacity by obliquely extending a lug part from a part close to a central part of an upper part of an electrode toward a partitioning wall between an adjacent cell, and welding the extended lug part to a lug part of a pole plate of the adjacent cell. SOLUTION: A lug part 3 is provided at a part close to a central part of an upper part of each positive electrode 1 and a negative electrode 2 to be housed in adjacent cells of a battery jar 6, and obliquely extended toward a partitioning wall 4 of the battery jar. Continuously, the battery jar 6 is turned over, and a tip of the lug part 3 is dipped in a melted solder for connection. Furthermore, a recessed part of a turned cover 8 is filled with the adhesive agent, and a soldered part 7 is embedded so as to form a battery. With this structure, since the lug part 3 is provided close to a central part, lowering of voltage is reduced so as to improve the discharging voltage characteristic at the time of efficient discharging, and a space between the lug part 3 and the partitioning wall of the battery jar is widened so as to prevent the absorption of the adhesive agent to the positive electrode 1, the negative electrode 2 and the separator 5 due to the surface tension of the adhesive agent, and the battery capacity can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connection between cells of a lead storage battery.

[0002]

2. Description of the Related Art Conventionally, a connecting means between cells of a lead-acid battery is, as shown in FIG.
3. An inter-cell connector 16 made of solder, lead alloy, or the like is soldered or electrically welded to the tip of an ear 15 provided vertically to the end of the negative electrode plate 14, and embedded in an adhesive 17 such as an epoxy resin. I have. In the configuration shown in FIG. 3, the ears 15 need to be provided at the ends of the positive electrode plate 13 and the negative electrode plate 14 in order to shorten the length of the inter-cell connector 16. Is small, the adhesive 17 is easily sucked up by the surface tension, and if the adhesive 17 adheres to the active materials of the positive electrode plate 13 and the negative electrode plate 14 and the separator 18, the capacity is reduced and the life is shortened.

For this reason, as shown in Japanese Utility Model Laid-Open Publication No. 59-53765, the lugs of the electrode plate are bent so that the projections correspond to the partition walls so that the adhesive can completely enter the gaps.

[0004]

Since such an inter-cell connecting means has an ear portion provided at an end of the electrode plate, a voltage drop of the electrode plate at a high rate discharge is large and a discharge voltage of the battery is low. Or the adhesive filling the connection between cells crawls up due to surface tension due to the narrow space between the battery case partition and the ears, is sucked into the plates and separators, and the capacity of the battery is reduced due to insufficient use of the plates. And the life performance is deteriorated at an early stage.

Furthermore, since the electrode plate ears are forcibly bent, stress corrosion occurs at the base of the ears, causing breakage of the electrode plate during use or unevenness in the thickness direction of the electrode plate, resulting in a short circuit. It was also the cause.

[0006]

In order to solve such a conventional problem, the present invention comprises a positive electrode plate, a negative electrode plate and a separator arranged in the same direction as the connection direction between cells connected in a row. The electrode plate group is placed in the battery case, and the ears provided on the upper part of the electrode plate extend diagonally from the upper edge to the partition with the adjacent cell from the part from the center to the different polarity of the adjacent cell. The lugs of the electrode plates are also obliquely extended toward the partition walls, gathered in one place, welded and filled with an adhesive.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, an electrode plate group composed of a positive electrode plate, a negative electrode plate, and a separator arranged in the connection direction between cells is arranged in a battery case, The ears provided on the upper part of the electrode plate are diagonally extended toward the partition wall with the adjacent cell, and the ear parts of the electrode plates having different polarities of the adjacent cell are diagonally extended toward the partition wall, so that the ear parts are separated from each other. It can be carried out by welding to each other.

[0008] With this configuration, the adhesive is not sucked into the separator and the electrode plate, so that the battery capacity is stabilized and the discharge voltage characteristics during high-rate discharge are improved.

The tips of the ears of the cells adjacent to each other assembled on the upper part of the partition can be welded by electric welding means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration in which ears 3 provided at the center from the ends of the positive electrode plate 1 and the negative electrode plate 2 are provided obliquely toward the battery case partition wall 4 and welded to adjacent cells. In the embodiment shown in FIG. 1, two positive plates 1 each having a width of 35 mm × a height of 70 mm × a thickness of 3.5 mm and being inclined toward the battery case partition wall 4 and having ears 3 provided 10 mm from the end from the center. Using. Negative electrode plate 2 having the same shape but a thickness different from 1.5 mm
Are arranged in the cell of the battery case 6 in the longitudinal direction.

Next, the battery case 6 is inverted, and the tip of the ear 3 provided diagonally to the adjacent cell located on the battery case partition wall 4 is soldered in a concave steel plate, and the ear is formed by electromagnetic induction. After melting and integrating the tip of 3 and the solder portion 7 to connect the cells, an adhesive 9 was poured into the lid 8 to embed the ears 3 to form a battery. Thereafter, a sealed battery of 6V5Ah was prepared by a conventional method.

These batteries are constructed, and the rate of occurrence of suction of the adhesive 9 into the separator 5 and the capacity at 5 CA (20 A) discharge after charging by injecting the electrolyte are measured from the side of the electrode plate. A comparison was made with a conventional battery having ears 15 provided vertically. At the time of bonding, the suction of the adhesive into the separator is 1/200 in a conventional battery having an ear shape.
In the case of the ear-shaped battery according to the present invention, no occurrence occurred at all, while two batteries occurred.

As shown in FIG. 2, the 5CA discharge characteristics of the ear-shaped battery A according to the present invention are similar to those of the conventional battery B.
, The discharge voltage is higher overall and the duration is longer. Further, the variation in the discharge time was also reduced. This is because the electrode plate was moved from the edge to the center, and the resistance of the electrode plate was reduced due to the electrode plate lattice body, and the bleeding of the adhesive into the separator and the electrode plate active material was completely eliminated. .

[0015]

As described above, according to the present invention, since the lugs are provided obliquely from the center of the electrode plate and the ends thereof are directly welded, the bonding to the separator or the electrode plate is performed at the time of bonding. It is possible to stabilize the battery capacity without absorbing the agent, and to improve the discharge voltage characteristics at the time of high-rate discharge. Further, according to the inter-cell welding means of the present invention, the joints are made by electromagnetic induction, but the positive and negative electrode ear tips may be directly soldered.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lead storage battery according to an embodiment of the present invention.

FIG. 2 is a discharge characteristic diagram of a lead storage battery according to an embodiment of the present invention and a conventional example.

FIG. 3 is a cross-sectional view of a conventional lead storage battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Ear part 4 Battery case partition 5 Separator 6 Battery case 7 Solder part 8 Lid 9 Adhesive

Claims (2)

[Claims] 1. In a lead-acid battery in which an electrode group consisting of a positive electrode plate, a negative electrode plate, and a separator is arranged in a battery case, a lug provided on an upper portion of the electrode plate extends obliquely toward a partition wall between adjacent cells. A lead-acid battery in which the lugs of the polar plates of different polarities in adjacent cells are obliquely extended toward the partition walls, the lugs are welded to each other, and connected by filling with an adhesive. 2. The lead-acid battery according to claim 1, wherein the tips of the ears of adjacent cells assembled on the upper part of the partition are electrically welded to each other to connect the cells.