JPH0548211U - Lead acid battery - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents the occurrence of sparks due to the breakage of the strap and reduces the risk of explosion. A projection 9 provided on a frame of a pole plate and a conductor 10 fixed in a cell are arranged in contact with each other, and a plurality of pole plates are connected in parallel by a strap and a conductor. It is a lead storage battery. The conductors made of lead, lead alloy, etc. are always in contact with the protrusions provided on the frame of the multiple plate grids so that even if any part of the strap breaks, the strap is kept conductive by the conductors. Prevent sparks from breaking

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a storage battery.

[0002]

[Prior Art]

 As shown in FIG. 2, the basic structure of the conventional lead-acid battery is that the positive electrode plate 1 and the negative electrode plate 2 are alternately stacked with the separator 3 interposed, and the ears 4 and 5 of each electrode plate are connected by the lead alloy. The straps 6 and 7 formed and welded to the pole 8 are housed in the battery case 12, and the electrolytic solution is injected to a predetermined height 11. This unit cell has a voltage of about 2V and is used by connecting a plurality of unit cells in series to obtain a required voltage.

[0003]

[Problems to be solved by the device]

However, the lead-acid battery as described above has the property that during use, electrolysis of water occurs due to overcharge, the water content in the electrolytic solution decreases, and the electrolytic solution surface 11 decreases. In actual use, it is used while replenishing water appropriately so that it does not fall below the minimum allowable liquid level, but in the case of neglecting water refilling or significant overcharging due to imbalance between charging and discharging, the electrolyte surface 11 is below the minimum allowable height, and the straps 6 and 7 are exposed. In such a state, the straps 6 and 7 formed by welding the plurality of current collecting ears 4 and 5 are likely to be locally corroded by an electrochemical reaction and a chemical reaction during charging and discharging. If this continues for a long period of time, corrosion progresses and the straps 6 and 7 are broken. If the breakage of the straps 6 and 7 occurs during energization, a spark may be generated, which may cause a flammable explosion of the surrounding H ₂ gas.

Usually, such corrosion rupture is not a problem because the life of the electrode plate and the like is exhausted before it occurs. The straps 6 and 7 are designed to suppress the generation and progress of trap corrosion depending on the alloy type, shape, welding method, and the like. However, under severe operating conditions that are not normally assumed, corrosion breakage of the straps 6, 7 may occur. For example, in automobiles that use a 12V lead-acid battery, the temperature inside the bonnet has recently been raised. When a lead-acid battery is used at high temperature, the overcharge current increases, resulting in overcharge heat generation, the battery temperature rises, and the overcharge increases. Corrosion at high temperature is accelerated according to Arrhenius' law.

Even under the above circumstances, it is desirable that the storage battery be used safely without causing any abnormality until the end of its life. The present invention was made in order to solve the above problems, and its purpose is to prevent the occurrence of sparks even when the strap is corroded and ruptured, and has a low risk of explosion in a lead acid battery. The point is to provide.

[0006]

[Means for Solving the Problems]

 Therefore, the lead-acid battery is characterized in that the protrusions provided on the frame of the electrode plate grid are placed in contact with the conductors fixed in the cells, and multiple electrode plates are connected in parallel with the straps and conductors. By doing so, the above problems are solved.

[0007]

[Action]

 In conventional lead-acid batteries, sparks are generated when the strap breaks because the closed loop during energization is momentarily interrupted. To prevent this, a resistor or capacitor should be connected in parallel at the breaking point of the strap. The present invention focuses on this point and achieves it by using a conductor fixed in a battery case. That is, the conductors made of lead, lead alloy, etc. are always in contact with the protrusions provided on the frame of the multiple plate grids, so that even if any part of the strap breaks, the conductors will always be kept in a conductive state. This prevents sparks from occurring when the strap breaks.

[0008]

【Example】

 FIG. 1 is a diagram showing an embodiment of the present invention. In order to bring the conductor 10 into contact with the protrusions 9 provided on the electrode plate grid made up of a plurality of sheets, as shown in the figure, the conductor 10 made of lead, lead alloy, or the like is previously fixed to the bottom 13 of the battery case. The electrode group may be housed in the battery case 12 described above. The projection 9 and the conductor 10 are always in contact with each other due to the weight of the electrode plate group, and as described above, the effect of preventing sparks when the strap is broken can be achieved relatively easily. In the present embodiment, only the negative electrode plate is connected with the strap and the conductor, but the present invention is not limited to this, and only the positive electrode plate may be used. It is more effective if both are applied. The same reference numerals as those in FIG. 2 represent the same functional members.

The contact between the conductor and the projection of the electrode plate grid is not necessarily limited to this embodiment, but it is preferable that the contact is made in the lower part of the battery case because of ease of manufacture and reliability during use. The numbers of protrusions and conductors can be appropriately selected.

[0010]

【The invention's effect】

 As described above, the protrusion provided on the frame of the electrode plate grid and the conductor fixed in the cell are arranged in contact with each other, and a plurality of electrode plates are connected in parallel with the strap and the conductor. By using a lead-acid battery as described above, even if the strap breaks when the liquid level drops, it is possible to prevent the occurrence of sparks with a relatively simple structure, so it is possible to improve the safety in using the lead-acid battery. .

[Brief description of drawings]

FIG. 1 is a diagram showing a single cell structure of a lead storage battery according to an embodiment of the present invention.

FIG. 2 is a view showing a single cell structure of a conventional general lead-acid battery.

[Explanation of sign]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Positive electrode plate ears 5 Negative electrode plate ears 6 Positive electrode strap 7 Negative electrode strap 8 Pole 9 Protrusion 10 Conductor 11 Electrolyte surface 12 Battery case 13 Battery case bottom

Claims (1)

[Scope of utility model registration request] 1. A projection (9) provided on a frame of an electrode plate grid and a conductor (10) fixed in a cell are arranged in contact with each other,
A lead storage battery comprising a plurality of electrode plates connected in parallel by a strap and a conductor.