JPS647567Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a storage case for a lead-acid battery, in which a battery is stored with an impedance element connected between the cathode and anode external terminals of the lead-acid battery. It is related to.

(b) Prior art Lead-acid batteries, especially so-called retainer-type lead-acid batteries in which the electrolyte is restricted so that no free electrolyte exists, are subjected to chemical conversion treatment after battery assembly, and shipped fully charged or Until the battery is stored and actually used, it is necessary to replenish the battery periodically, for example every 6 months, preferably every 3 months, and store it in a nearly fully charged state at all times.

This means that on average, a lead-acid battery self-discharges about 0.1 to 0.15% of its battery capacity per day, and after six months, the battery capacity decreases due to self-discharge of about 20 to 30%. i.e. 20-30%
is discharged. If the discharge products discharged by this self-discharge are activated by charging, in other words, if the battery capacity is restored,
Although it is not necessary to perform supplementary charging frequently, if the battery is left in this self-discharge state for a long period of time, lead sulfate (PbSO ₄ ), a discharge product, becomes inactivated, resulting in poor charging efficiency and insufficient capacity recovery. First, battery characteristics deteriorate, so maintenance must be performed by repeatedly performing supplementary charging.

However, this maintenance work is not only troublesome, but also
Even if supplementary charging was repeated, the battery capacity did not fully recover.

As a result of various studies, the inventors of the present invention have found that by connecting an impedance element between the negative and anode terminals, the PbO ₂ corrosion layer on the current collector surface is prevented from converting into an inactive PbSO ₄ layer during storage. We discovered this and proposed a method for preserving lead-acid batteries that does not cause deterioration of battery characteristics even after long periods of storage.

(c) Purpose of the invention The present invention relates to a storage case that stores and stores a lead-acid battery with an impedance element connected between its cathode and anode terminals. To provide a storage case that can suppress the deterioration of the battery and eliminate the trouble of supplementary charging between storage and actual use.

(d) Structure of the invention The present invention is a storage case for a lead-acid battery, in which a lead-acid battery is stored between the peripheral edge of the covering material and the base material, and the external terminal of the lead-acid battery to be stored. A storage case for a lead-acid battery, characterized in that a contact material that contacts the external terminal is fixed to the part of the base material where the external terminal is located, and an impedance element connected between the contact materials is fixed to the base material. It is.

(E) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. First, an example of a lead-acid battery housed in a storage case according to the present invention will be described. FIG. 1 is an exploded perspective view of a lead acid battery.

A flat current collector 3 is fixed to the inner surface of each of the resin body 1 constituting a part of the battery case and the battery case lid 2 that engages with the opening of the resin body 1. The resin body 1 and the battery case lid 2 are made of ABS. It is integrally formed by insert molding with resin. The external terminals 4, 4 of the cathode and anode are located on the same surface.

The resin body 1 further includes a valve chamber 7 in which a safety valve is disposed, an engagement groove 9 that engages with a projecting wall 8 of the battery case lid 2,
A gas hole 10 for discharging gas is formed.

Resin body 1, cathode active material layer 11, separator 1
2 and an anode active material layer 13 are stacked and housed.

At this time, one side of the cathode active material layer 11 or the anode active material layer 13 comes into contact with the flat current collector 3 .

Then, pour the required amount of 1.30 sulfuric acid electrolyte onto the electrode group from above. Since the area into which the electrolytic solution is injected is large, internal air or generated gas is easily replaced, and the electrolytic solution is immediately impregnated and retained in the electrode group.

Then, the resin body 1 and the battery case lid 2 are firmly and tightly sealed.
Charge it chemically to make it usable.

Next, an embodiment of a storage case for storing such a thin plate-shaped lead acid battery 20 will be described with reference to FIGS. 2 to 5.

Storage case 2 that stores the lead-acid battery 20 described above
1 is a base material 22 made of cardboard or the like, and this base material 22
A transparent covering plate 24 as a covering material is attached to the peripheral edge thereof and has a bulging portion 23 formed in the center according to the shape of the stored battery 20.

The battery 20 has a swollen portion 23 and a base material 22.
It is held and stored between the

Now, on the base material 22, the external terminals 4, 4 of the battery 20 are located at the locations where the external terminals 4,
Contact materials 25 are fixedly attached to each of the contact members 4 and 4, respectively.
An impedance element 26 such as a resistor is connected between the contact materials 25, 25. This impedance element 26 is composed of a printed resistor or the like, and is fixed to the base material 22. For example, a printed resistor or the like may be printed and fixed on the surface of the base material 22 (see FIG. 4), or a resistor or the like may be fixed on the back surface of the base material 22 (see FIG. 5).

Note that this impedance element 26 is preferably set to a size that allows the housed battery to discharge at a current value smaller than the 5 hour rate (0.2C). Furthermore, perforations 27 and the like are formed in the base material 22 in order to facilitate the removal of the battery 20.

Now, when the battery 20 after chemical conversion treatment is stored using this storage case 21, an impedance element 26 is connected between the cathode and anode external terminals 4, 4 of the battery 20 via the contact materials 25, 25. becomes. Therefore, if the battery is stored in this state until it is actually used and then charged before actual use, a lead-acid battery whose battery performance has not deteriorated can be used without any need for maintenance such as supplementary charging.

This means that if the corrosion layer of PbO ₂ formed on the surface of the anode current collector due to chemical charging is stored in an open circuit state, if left for a long period of time, it will turn into Pb ⁺⁺ ions, and this Pb ^{+ The +} ions react and combine with the SO ₄ ^-- ions remaining in the electrolyte to form an inert
_Four layers of PbSO are generated, which causes a voltage increase during charging after storage, resulting in charging failure. On the other hand, if the device of the present invention is left with the negative and positive poles connected to an impedance element, a discharge current will flow in response to the discharge voltage due to the load connection, resulting in a minute current discharge at the end of the discharge. Therefore, the discharge of the active material is completed uniformly around the surface of the electrode plate while the discharge of the active material is progressing, and most of the SO ₄ ^-- ions remaining in the electrolyte are consumed, so the PbO ₂ of the current collector in the corrosion layer
Since the generation of PbSO ₄ caused by Pb ⁺⁺ and SO ₄ ^-- is suppressed, the PbO ₂ corrosion layer that occurs due to long-term storage is suppressed.
Even after long-term storage, it shows an effective effect on charging, especially constant voltage charging, without causing the problem of deterioration of charging current carrying performance due to PbSO ₄ conversion.
It becomes possible to prevent deterioration of battery characteristics.

(f) Effects of the invention According to the storage case of the invention, simply by storing the battery in the storage case, an impedance element is connected between the cathode and anode external terminals of the lead-acid battery, making it easier to store the battery. In particular, during long-term storage, deterioration of battery performance can be prevented without the need for maintenance work such as supplementary charging, so in actual use, just by charging, the initial capacity is restored and battery performance does not deteriorate. Its practical effects, such as the ability to use batteries, are great.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a lead-acid battery stored in the storage case of the present invention, and FIGS.
The figure shows one embodiment of the present invention, FIG. 2 is a perspective view showing the state in which the battery is stored in the storage case, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIGS. 4 and 5 are FIG. 4 is a plan view showing the base material. FIG. 4 shows the case where the impedance element is fixed to the surface of the base material, and FIG. 5 shows the case where the impedance element is fixed to the back surface of the base material. 20...Battery, 21...Storage case, 22...
Base material, 23... bulging portion, 24... covering material (transparent covering plate), 25... contact material, 26... impedance element, 4... external terminal.

Claims (1)

[Scope of utility model registration request] A lead-acid battery storage case in which a lead-acid battery is stored between the periphery of the covering material and the base material by fixing the periphery of the covering material to the base material, where the external terminal of the lead-acid battery to be stored is located at a location on the base material, A storage case for a lead-acid battery, characterized in that a contact material that contacts the external terminal is fixed, and an impedance element connected between the contact materials is fixed to the base material.