JPH0443385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be used without recharging.
This invention relates to a ready-to-use sealed lead-acid battery.

Conventionally, all sealed lead-acid batteries have been sold in a completed state as liquid-filled rechargeable batteries. However, in practice, it is ideal to inject electrolyte into a storage battery and use it immediately. This is because storage batteries that have been charged with liquid during the manufacturing process,
This is because it often takes a long time before it can be used, as there is a period of neglect, shipping or other transportation, and so on. If a long period of time is required before use, the discharge capacity will decrease due to self-discharge of the storage battery. Therefore, problems such as the need for supplementary charging (recharging) occur, so leaving the battery for a long period of time is not preferable in terms of battery performance and life.

On the other hand, some storage batteries having a general structure that is not sealed, such as storage batteries for automobiles, already have a system in which electrolyte is injected when used, and are highly valued. However, in the case of sealed lead-acid batteries, since the product basically has a sealed structure, it is usually unthinkable to use a method in which electrolyte is injected during use. It is also necessary to prevent oxidation of the electrode surface that occurs when discharging occurs without the electrolyte being injected, and to make it possible to easily inject the electrolyte on site. Against the background of these technical problems, in the field of sealed lead-acid batteries, it has not yet been possible to create a storage battery that can withstand long-term storage before being used, and that can be used immediately after filling with electrolyte. I wasn't there. In particular, there were problems with the sealing performance of the sealing mechanism during use.

In view of the above-mentioned problems, the present invention provides a so-called ready-to-use storage battery that can withstand long-term storage from the time of manufacture to the time of use, and can be used immediately after injecting an electrolyte in the sealed lead-acid battery. The purpose of this invention is to ensure sealing performance at each stage during long-term storage and when used as a liquid injection.

FIG. 1 is a plan view of a storage battery according to the present invention.
Electrode terminals 2 and 3 protrude upward from two corners of the lid 1, and an exhaust hole 5 covered with a cover plate 4 is provided in the center. Further, an aluminum foil 6 (an example of a blocker) is fixed to the upper surface of the lid 1 in a direction parallel to the plate 4. As is clear from FIG. 2, which shows the lid body 7 from which the cover plate 4, foil 6, etc. have been removed, the portion covered by the foil 6 (FIG. 1) has a vertical injection port arranged in a straight line. 8 is provided, and an oval aluminum foil 6 surrounding the injection port 8
The welding table 9 with which it is attached protrudes slightly upward (towards the front of the page). Each inlet 8 has a step 1 with a larger diameter.
0, and each step 10 communicates with each other in the left-right direction via a recess 11.

As shown in FIG. 3, which is a partial cross-sectional view of FIG.
It is formed deeper than the The welding table 9 surrounding each injection port 8 has its upper end surface located on the same horizontal plane and is formed higher than the surroundings, and the foil 6 is fused and fixed only to the welding table 9. oil 6
is made of aluminum foil whose lower surface is coated with thermoplastic resin, and is fused to the fusion table 9 while maintaining airtightness by high-frequency heating or the like.

As shown in FIG. 4, the exhaust hole 5 has a cylindrical small diameter part 14 in the center that projects upward from the bottom plate 13, and the upper end of the small diameter part 14 has cutouts arranged at equal intervals in the circumferential direction. A notch 15 is provided. Small diameter part 1
A rubber cap 16 is fitted onto the upper part of the small diameter portion 14 to elastically close the small diameter portion 14. A disc-shaped filter 18 made of air-permeable porous ceramics or the like is fitted into and fixed to a stepped portion 17 formed in the vertically intermediate portion of the hole 5 . The cover plate 4 that covers the hole 5 from above is a rectangular resin plate as shown in FIG. 5, and has two positioning protrusions 19 at the center on the back side and four legs 20 for welding to the lid at both ends. It has an integrated structure. Therefore plate 4
The shallow recess 2 formed on the top surface of the lid body 7 in Fig. 4
When the legs 20 are fixed to the base plate 1 by melting using ultrasonic waves or the like, the plate 4 is easily placed in a predetermined position. In FIG. 2, reference numeral 23 indicates a hole into which the positioning projection 19 fits.

Incidentally, in the above embodiment, the porosity of the negative and anode plates used is set to 50% or more, so that when the electrolyte is injected from the injection port 8 (Fig. 2), the porosity of the negative and anode plates is set to 50% or more. This prevents the formation of air and gas pockets, and also allows the electrolyte to penetrate smoothly into the electrode plates during injection, resulting in stable battery performance. In addition, the total distance t between the cathode plate and the anode plate in the electrode plate group thickness T is set to a value that satisfies 0.15T≦t≦0.5T. It is possible to improve the permeability of the cells and obtain further stability in battery performance. That is, t is 0.15T
If the temperature is below, the injection may not be performed smoothly or
As a result of many experiments, it has become clear that battery performance deteriorates significantly when the voltage exceeds 0.5T. For example, considering a group of electrode plates as shown in FIG. 6, the thickness T and the total t are as shown in the figure. In FIG. 6, 24 is a cathode plate, 25 is an anode plate, and 26 is a separator.

Next, how to use it will be explained. The storage battery shown in FIG. 1 is in a state where no electrolyte is injected, and as shown in FIG. 3, the injection port 8 is closed with aluminum foil 6 to maintain airtightness. As shown in FIG. 4, the exhaust hole 5 is closed by closing the small diameter portion 14 with a rubber cap 16. That is, in the state shown in FIG. 1, the inside of the storage battery is airtight with respect to the outside, and oxidation of the electrode plates 24 and 25 (FIG. 6) inside the storage battery is prevented.

The liquid injection operation is performed as follows. The aluminum foil 6 shown in Fig. 1 is peeled off to expose the injection port 8 (Fig. 2). Next, the electrolyte is injected from the injection port 8 using a suitable electrolyte container. The injection speed is preferably 0.5 to 2.0 cc/sec because if it is too fast, the electrolyte will overflow from the battery or the battery will not perform as expected.As shown in FIG. 3
8 may be formed to speed up penetration. The amount of electrolyte to be injected is preferably 95 to 110% of the pore volume of the electrode plate group in order to absorb gas generated during charging during use inside the battery.

When the injection is completed, fit the sealing plug 39 as shown in FIG. 8 into the inlet 8 as shown in FIG. 11, and close the inlet 8.
to be sealed. The sealing plug 39 is made up of a number of plug bodies 40 corresponding to the number of injection ports 8 (six in this case) connected together by a connecting portion 41. Note that FIGS. 9 and 10 show other embodiments of the sealing plug 39.

As explained above, according to the present invention, the electrolyte inlet 8 at the upper end of each cell of a sealed lead-acid battery having a plurality of cells in which electrolyte has not been injected is connected to the plurality of plug bodies via the connecting portion 41 extending downward. 40 is configured to be sealed with a corresponding plug body 40 of a continuous sealing plug 39, and a stepped portion 10 is provided on the upper edge of each electrolyte inlet 8 on which a flange 42 at the upper end of the plug body 40 is seated, Further, a recess 11 into which the connecting portion 41 of the sealing stopper 39 fits is provided between adjacent step portions 10, and a band-shaped fusion table 9 surrounding the group of step portions 10 and higher than the step portions 10 is formed. A film-like barrier (aluminum oil 6) that is easy to remove is attached to the fusing table 9 to maintain airtightness and prevent oxidation of the internal electrode plate, resulting in the following special effects. is obtained.

(A) After injecting liquid into each cell, when fitting the corresponding stopper body 40 of the sealing stopper 39 into each injection port 8, the flange 42 at the upper end of the stopper body 40 is placed at a position higher than the stepped portion 10 on which it is seated. Because of the fusing table 9 of No. 6, the stepped portion 10 will not get dirty and will remain smooth even when left for a long period of time without injecting electrolyte, and the aluminum foil 6 will then be removed. When the sealing plug 39 is attached after injecting the liquid,
The flange 42 is formed into close contact with the stepped portion 10, and a high sealing effect can be obtained.

(B) The connecting portion 41 that protrudes downward when the sealing plug 39 is attached can be accommodated in the recess 11, so that the connecting portion 41 does not protrude upward from the top surface of the plug body 40, and the connecting portion 41 is not pressed upward, there is no fear that the connecting portion 41 will loosen the tight contact between the flange 42 and the stepped portion 10, and the sealed state during use can be stably maintained for a long period of time.

(C) By providing the recess 11, the sealing plug 39 can be provided with a connecting portion 41 projecting downward, making it easier to attach and remove the sealing plug 39. That is, when one of the adjacent plug bodies 40 is attached or detached, the connecting portion 41 extends and does not affect the fitted state of the other plug body 40. Furthermore, the electrolyte inlet 8 of a sealed lead-acid battery without an electrolyte injected therein is kept airtight by an easily removable barrier (for example, aluminum foil 6), and the internal electrode plates 24 and 25 are oxidized. Since this has been prevented, the following effects can be expected.

(a) It can be used immediately when you want to use it. That is, supplementary charging is not necessary when using the battery for the first time.

(b) Can be stored at high temperatures. Therefore, there is no need to worry about battery deterioration during transportation by belt.

(c) The lifespan of storage batteries is improved. In conventional sealed batteries, the longer the storage period from the time of manufacture to the time of use, the shorter the battery life will be, but if the present invention is adopted, such problems will not occur.

The effects of the present invention will be explained in comparison with conventional products as follows. Figure 12 shows the relationship between storage period (years) and discharge capacity (%), with solid lines A,
B shows the case where the storage battery according to the present invention was stored in an atmosphere of 25°C and 50°C, respectively, and broken lines C and D show the case where the conventional product was stored in an atmosphere of 25°C and 50°C, respectively. FIG. 13 is a diagram showing the discharge capacity change with respect to the life test cycle, and the case of the conventional product is taken as 100%. Solid line E indicates the present invention,
Broken line F is the conventional product. The storage battery according to the invention is also superior to conventional ready-to-use open storage batteries. FIG. 14 is a diagram showing the relationship between voltage and duration in -10°C high rate discharge, in the case of a conventional open type storage battery. In FIG. 14, the solid line G represents the present invention, and the broken line H represents the conventional product. 100% is based on conventional products.

According to the above embodiment, the following effects can be expected.

(a) Since the negative and anode plates 24 and 25 are dry-charged plates with active material porosity of 50% or more, there is no air or gas accumulation when injecting the electrolyte, improving battery performance. Stabilize.

(b) Plate group thickness T and total plate spacing t (Fig. 6)
Since 0.15T≦t≦0.5T, liquid injection can be performed smoothly and a decrease in battery performance can be prevented.

(c) Since the electrolytic solution is injected at a speed of 0.5 to 2.0 cc/sec, no air or gas accumulation occurs in the separator 26, and the electrolyte can be injected smoothly.

(d) Since the amount of electrolyte injected is 95 to 110% of the pore volume of the electrode plate group, the electrode plate group has the gas absorption function required for a sealed battery.

(e) The injection ports 8 are sealed by pushing in the sealing plugs 39, which are connected together in a number corresponding to the number of cells so as to match the spacing between the injection ports 8, without protruding from the top surface of the battery. The sealing of the injection port 8 after the liquid is easily ensured. Also, it is difficult to fall off or forcefully open during use,
There is no risk of performance deterioration due to early liquid reduction. Moreover, since the connected sealing plugs 39 are used, there is no chance of losing one of them.

Although aluminum foil 6 is used as the barrier in the above embodiment, the barrier is not limited to this, and for example, a sealing plug that is easy to attach and detach may be used.

[Brief explanation of drawings]

FIG. 1 is a plan view of the storage battery according to the present invention, FIG. 2 is a plan view of the lid body, FIGS. 3 and 4 are a partial cross-sectional view and a partial cross-sectional view, respectively, of FIG. A back view of the plate, FIG. 6 is a schematic plan view of the electrode plate group, FIG. 7 is a partial schematic cross-sectional view of the battery case of the storage battery, FIGS. 8, 9, and 10 are perspective partial views of the sealing plug. Figure 11 is a diagram corresponding to Figure 3 showing the state in which the sealing plug is attached, Figure 12 is a graph showing the relationship between storage period and discharge capacity, and Figure 13 is a graph showing the relationship between charge/discharge cycle ratio and discharge capacity ratio. The graph shown in FIG. 14 is a graph showing the relationship between duration ratio and voltage ratio. 6... Aluminum oil (an example of a blocker), 8... Electrolyte inlet, 24, 25... Internal electrode plate.

Claims (1)

[Scope of Claims] 1. A sealed lead-acid battery having a plurality of cells in which electrolyte is not injected, in which an electrolyte inlet at the top of each cell is connected to a plurality of plug bodies through a connecting portion extending downward. The sealing stopper is configured to be sealed with the corresponding stopper body, and a stepped portion is provided on the upper edge of each electrolyte inlet on which the flange at the upper end of the stopper body is seated, and a seal is formed between adjacent stepped portions. A recess into which the connecting part of the stopper fits is provided, and a band-shaped welding table surrounding the group of steps and being higher than the step is formed, and an easily removable film-like barrier is attached to this welding stand to maintain airtightness. A ready-to-use sealed lead-acid battery characterized by its close contact to prevent oxidation of the internal electrode plates. 2. The negative and anode plates of the sealed lead-acid battery are dry-charged plates in which the porosity of the active material is 50% or more in the cathode and anode plates, respectively. Ready-to-use sealed lead acid battery. 3 The thickness T of the electrode plate group of the sealed lead-acid battery and the total distance t between the cathode plate and the anode plate are 0.15T≦t≦
The ready-to-use sealed lead-acid battery according to claim 1, characterized in that it has a relationship of 0.5T.