JPS6185769A - Hermetically closed type lead storage battery - Google Patents

Abstract

PURPOSE:To improve assembling work and obtain light weight and highly reliable battery by providing a connecting body made of copper alloy to the ear portion of a grating and connecting it to the other cell terminal through the ultrasonic wave soldering. CONSTITUTION:A connecting body 7 of brass rod is provided bridging over the recessed portions of the ear portion 1 of negative plate and the ear portion 5 of positive plate of neighboring cell, and a connecting body 8 for brass termi nal is also provided at the recessed portion of ear portion of end cell. Under this condition, the connecting bodies 7, 8 are provided reversely so that these do not more, the connecting bodies and ear portions are immersed at a time into the ultrasonic wave soldering tank and soldered for connection with other cells or terminals. The ultrasonic wave soldering tank is set to the condition where the vibration frequency is 18kHz, heating temperature is 220 deg.C, and the soldering tank surface is exposed to the ambient of nitrogen gas of inart gas.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sealed lead-acid battery used as a power source for electronic equipment, disaster prevention, etc.

Conventional configurations and their problems In recent years, sealed lead-acid batteries have become widely used as power supplies for electronic devices such as video cameras and hand belt computers, as they are maintenance-free and body-free. There is. Additionally, as electronic devices become smaller and lighter, demands for smaller and lighter sealed lead-acid batteries, which serve as power sources, are increasing year by year.

Efforts to reduce weight include creating a lattice base using synthetic resin and coating its surface with lead or lead alloy to form a lattice body, or layering lead or lead alloy thin sheets on synthetic yoso film. A method of forming a lattice body by expanding or punching a sheet-like substrate integrated with a lattice structure is being considered. How to use these synthetic resins.

It poses no hindrance to the main functions originally required of the lattice body of a lead-acid battery, that is, to hold the filled active material and to take it out as a conductor for electrochemically generated electromotive force. Not only does it not have a specific gravity compared to lead or lead alloys, so for lead-acid batteries, where the lattice makes up most of the weight of the entire battery, it significantly reduces the total weight.
Energy density per unit mold can be increased.

However, so-called hybrid grids, such as synthetic resin grids or grids in which lead or lead alloy and synthetic resin are integrated in layers, have great advantages as described above, but on the other hand, the ears, which are current collectors, are made of thin lead plates. Because it is an aggregate of synthetic resin, if you solder it with a soldering iron or weld it with a burner, the lead layer will break or the melted resin will cover the lead layer, making it difficult to connect to other cells or terminals. Met.

Moreover, this tendency becomes more pronounced as the lead or lead alloy layer becomes thinner, and has been a major obstacle to practical application.

Purpose of the Invention The present invention is intended to improve the above-mentioned conventional problems, and by using a simple welding method and performing complete welding, light I
The aim is to create a highly reliable sealed lead-acid battery and to improve its assembly workability.

Structure of the Invention The present invention is directed to the ears of a lattice body formed of a layered integrated substrate of a lead or lead alloy thin plate and a synthetic resin thin plate, or formed by coating a synthetic fat surface with lead or a lead alloy. The method is characterized in that a rod-shaped or plate-shaped connection body made of copper or copper alloy is installed, and in this state, soldering is performed using ultrasonic waves to connect to other cells or terminals. By installing copper or copper alloy connectors and soldering them using ultrasonic waves, it is possible to easily weld the hybrid grid ears and create a lightweight and highly reliable sealed lead-acid battery. Moreover, it is possible to improve the assembly work efficiency.

For the prototype, 6Ve and sAh batteries were used. Conventionally, this battery uses a 0.7 m thick lead alloy sheet containing 3% by weight of tin as the negative electrode lattice by expanding it, but in this prototype, the front and back sides of a 0.5 m thick ABS resin sheet were used. A 0.1 m thick lead alloy thin plate containing 3% by weight of tin is heat welded.
. , 7 wm thick, and then expanded to form a negative electrode grid. This grid body is shown in a perspective view in FIG. In FIG. 1, 1 is an ear part, 2 is an expanded lattice part, 3 is an ABS sanitary resin, and 4 is a lead alloy thin plate.

An active material paste was applied to the negative electrode expanded lattice body created in this manner to obtain a negative electrode plate. This negative electrode plate, a conventional separator, and a positive electrode plate were combined into a group, and then inserted into an ABS battery case.

This situation is shown in the perspective view of FIG. In Figure 2, 6
is a positive electrode plate lug, and 6 is a battery case.

Next, the connection body used this time is shown in a perspective view in FIG. In FIG. 3, 7 is a brass rod with a diameter of 1 m bent into a U-shape. This connecting body 7 was installed so as to bridge the recesses of the balance plate lug 1 and the positive electrode plate lug 6 of the adjacent cell shown in FIG. A terminal connector 8 made of brass, shown in the perspective view of FIG. 4, was also installed in the recess of the ear of the end cell. This situation is shown in the perspective view of FIG. In this state, each connection body was held still and turned upside down, and the connection body and ears were immersed in an ultrasonic solder bath for 6 seconds at a time. The ultrasonic solder bath was set to a vibration frequency of 18 KHz and a heating source of 11 [2201:], and the surface of the solder bath was placed in an inert gas nitrogen atmosphere.

Sixty prototype batteries were made with intercells and terminals taken out using this method, and no soldering defects were observed.

The reason for the successful soldering is that the ultrasonic waves applied to the solder tank K have the effect of forcibly removing dirt from the lead alloy surface, and also have the effect of lowering the surface tension of the solder, which prevents the solder from forming on the lead alloy surface. It is possible that it has become easier to grow.

In addition, as mentioned above, the solder stretches easily and can be soldered in a short time, so the edge of the negative electrode plate is made of a layered material of lead alloy thin plate and ABS resin and has a very small heat capacity compared to the positive electrode. Despite this, good soldering was obtained,
There was no deformation of the resin.

By the way, a conventional method for cleaning the lead alloy surface is to apply 7 lux and then solder it. However, when flux is used, corrosion may occur on the lead alloy surface, and especially when soldering is performed on a lead alloy thin plate like the one in this example, the lead alloy thin plate may be cut due to corrosion, resulting in poor battery performance. becomes a major obstacle. Therefore, it can be said that the method of the present invention, in which the ears of the electrode plates are connected by ultrasonic soldering, is a very effective means.

In this embodiment, a tapered recess is provided in the upper part of the ear portion of the electrode plate, but good soldering can be obtained even if no recess is provided. In addition, here, lead alloy thin plate and A
Although we have shown an example in which the ears are formed from a layered integrated board of BS resin sheets, the same soldering is not possible even when the ears are formed from a board whose synthetic resin surface is coated with lead or lead alloy. Needless to say, you can obtain

Effects of the Invention The present invention is formed of a layered integrated substrate of a lead or lead alloy thin plate and a synthetic resin thin plate, or a lattice body whose synthetic resin surface is coated with lead or a lead alloy has an edge portion made of copper or a copper alloy. A lightweight and highly reliable sealed lead-acid battery can be created by installing rods or plates, soldering them using ultrasonic waves, and connecting them to other cells or terminals.
The assembly workability can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the electrode plate lattice of a sealed lead-acid battery according to an embodiment of the present invention, FIG. Figure 3 is a perspective view of the connector, Figure 4 is a perspective view of the terminal connector, and Figure 6 is a perspective view of the connector before soldering and the terminal connector installed. . 1... Lattice ear part, 2... Lattice part, 3.
...Resin, 4...Lead alloy thin plate, 6...
...Positive electrode ear part, 6...Battery container, 7...
Connection body, 8...Connection body for terminals. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Illustrations, Figure 3, Figure 4, Figure 5

Claims (2)

[Claims] (1) Copper or copper is used in the ears of the lattice body, which is formed of a layered integrated substrate of a lead or lead alloy thin plate and a synthetic resin thin plate, or is formed by coating the synthetic resin surface with lead or lead alloy. A sealed lead-acid battery that has an alloy rod-shaped or plate-shaped connecting body installed and connected to other cells or terminals by soldering. (2) A rod-shaped or plate-shaped connection body made of copper or copper alloy;
The sealed lead-acid battery according to claim 1, wherein the lead or lead alloy of the grid ears are soldered using ultrasonic waves.