JPH0676855A - Sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To provide a sealed lead-acid battery having excellent vibration resistance and improved reliability by burying straps in the resin kept in contact with a battery cover, and fixing an electrode plate group to a battery jar with an adhesive. CONSTITUTION:Epoxy resin 8 is poured until strap sections 6 and inter-cell connection sections 6' are completely buried at a cover back section. The bottom section of an electrode plate group is fixed to a battery jar 1 with an epoxy adhesive 7. When a sweep is applied for the preset time from the frequency of 30Hz to the frequency of 2000Hz at the preset acceleration during an electric discharge, no voltage drop is noticed until the discharge voltage becomes 1.8V, because the strap sections 6 are buried in the resin 8 kept in contact with a battery cover 2 and fixed at two positions. A sealed lead-acid battery having excellent vibration resistance and improved reliability is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved sealed lead acid battery.

[0002]

[Prior art and its problems] The application field of lead-acid batteries is wide,
There are large-capacity stationary lead-acid batteries and small-capacity lead-acid batteries for cycle service used in portable cassette tape players and the like. However, these lead-acid batteries are preferably sealed types that do not require maintenance. However, in any case, most of these lead-acid batteries are used in a stationary state with a relatively stable posture. However, in recent years, sealed lead acid batteries have begun to be used for electric vehicles, motor sports, etc., and large vibrations are often applied to lead acid batteries.

In the prior art, as a method for improving the vibration resistance, an adhesive is used to fix the bottom of the electrode plate group to the bottom of the battery case (so-called anchor bond is used) and the degree of pressure on the electrode plate group is adjusted. Although it has been attempted to increase the strength, when an intense vibration is continuously applied like in F1 races, it is not enough to use only anchor bonds or increase the pressure on the electrode group. However, there is a problem in the reliability of the lead storage battery due to internal short circuit due to the drop of the active material caused by vibration and deterioration of the separator.

[0004]

[Means for Solving the Problems] Vibration resistance is obtained not only by fixing an electrode plate group to a battery case by using an anchor bond but also by combining two factors of fixing a strap for forming the electrode plate group. Can be improved by 5 times or more as compared with the case where only the anchor bond is used or the degree of pressure on the electrode plate group is increased.

[0005]

[Function] The electrode plate group cannot be fixed only by applying a strong pressure to the electrode plate group. Also, when using only anchor bonds, if strong vibration is applied to the electrode plate group, the upper part of the electrode plate group is not fixed, so the upper part of the electrode plate group easily vibrates, and the active material falls off there. It will be easier. However, the electrode plate group is fixed to the battery case with an epoxy-based adhesive, etc., and the upper part of the electrode plate group that easily vibrates by itself, that is, the strap part for configuring the electrode plate group is in contact with the battery lid. When it is fixed in two or more places by being buried in, the vibration resistance is significantly improved.

[0006]

EXAMPLE Three retainer-type sealed lead-acid batteries (capacity about 5 Ah / 20 hR-6V) having the same structure were manufactured using the same electrode plate. FIG. 1 shows an overview of a battery cross section. One of them was processed by pouring the epoxy resin 8 into the back of the lid until the strap 6 and the cell-to-cell connecting portion 6 ′ were completely buried (battery A). On the other hand, although the strap 6 is exposed in the gas phase, the bottom of the electrode plate group was fixed to the battery case 1 using the epoxy adhesive 7 (battery B). Then, the other was subjected to both of the above processes (Battery C).
In the figure, 2 is a battery lid, 3 is a positive electrode plate, 4 is a negative electrode plate, 5
Is a separator, 9 is a positive electrode terminal, and 10 is a negative electrode terminal.

These batteries were subjected to a vibration test. The condition of the vibration test at this time is 25 while discharging at 0.1 CA.
With G acceleration, the frequency is swept from 30 Hz to 2000 Hz for 20 minutes. As a result, Battery A caused a significant voltage drop at 1 hour and 5 minutes, and Battery B caused a similar voltage drop at 1 hour and 51 minutes. However, in Battery C, no significant voltage decrease was observed until the discharge voltage reached 1.8 V (required time: 10 hours 48 minutes).

[0008]

The present invention provides a sealed lead-acid battery with excellent vibration resistance by fixing the electrode plate group to the battery case and immersing the strap portion in the resin in contact with the battery lid. And its industrial value is tremendous.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of the sealed lead-acid battery of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Battery lid 3 Positive electrode plate 4 Negative electrode plate 5 Separator 6 Strap 6'Inter-cell connection part 7 Adhesive 8 Resin 9 Positive electrode terminal 10 Negative electrode terminal

Claims (1)

[Claims] 1. A sealed lead-acid battery in which a strap is embedded in a resin in contact with a battery lid, and an electrode plate group is fixed to a battery case by, for example, an adhesive.