JPS607071A - Sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent escape of oxygen gas to the outside by specifying the height of electrolyte level in an anode absorbed type sealed lead-acid battery prepared by placing retainer impregnated with electrolyte between anode and cathode plates. CONSTITUTION:A plate group 1 is prepared by mutually stacking a required number of anode plates 2, retainer 3 impregnated with electrolyte, and cathode plates 4. The plate group 1 is accommodated in a container 6 with a specified value of pressure applied by spacers 8. Electrolyte 10 is poured so that the electrolyte level A is 1/2-1/10 of height of the plate group 1, and spaces 11 are formed between side wall 9 of the container 6 and both end anode plates 2' to form an anode absorbed type sealed lead-acid battery. Oxygen generated in the cathode plate 4 during charge is absorbed to anode plates 2 in the spaces 11 and reacted with anode active material. Therefore, escape of gas to the outside is prevented and battery performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cathode absorption type sealed lead acid battery.

In general, a closed-pole absorption type marine storage battery has a cathode plate absorb oxygen gas generated from the anode plate during charging.
It has a structure that reacts with the cathode active material and prevents gas from escaping to the outside.

Conventionally, this type of lead-acid battery is housed in a battery case with a group of electrode plates that are alternately stacked with a retainer interposed between the required number of negative and anode plates to impregnate and retain the electrolyte.
Generally, the entire surface of the electrode plate group is immersed, or a slightly larger amount of electrolyte is injected and immersed for charging and discharging, and the liquid level must be kept such that the entire surface of the electrode plate is immersed at all times. It was a target. Therefore, there was a problem that the absorption reaction of oxygen gas at the cathode plate was not good. The present invention eliminates the above-mentioned drawbacks, and the liquid level height in the battery case 1 is set to the height of the electrode plate i to x. A gap is provided above the electrolyte level on at least one side between the cell wall and the cathode plates at both ends of the electrode plate group to improve the gas cathode absorption reaction and improve the performance of the storage battery. The present invention provides a sealed lead acid battery having an improved structure.

To explain the embodiment of the present invention with reference to the drawings, 1 is a group of electrode plates formed by alternately stacking a required number of cathode plates 2, retainers 3, and anode plates 4, and a pole column 5 is planted on the top; 6 is the electrode plate group; A battery case 8 is used to place and store the plate group 1 in the bottom part 7 of the tank, and 8 is a battery case for applying a predetermined group pressure to the plate group 1 when the plate group 1 is stored in the tank 6. A spacer is forcibly inserted between both end plates (cathode plates) 2' of 1 and the wall 9 of the battery case 6, 1o is an electrolytic solution,
A represents the liquid level. Reference numeral 11 denotes a wall portion 9 between the upper part of the battery case 6, that is, the back surface of the upper lid 12, or a gap between the cathode plates 2' at both ends of the electrode plate group 1.

By setting the liquid level A of the electrolytic solution 1o poured into the battery container 6 to be between - and one of the height of the electrode plates, a gap between the cathode plates 2' at both ends of the electrode plate 210 and the wall portion 9 of the group 1 is set. A void 11 at a height equal to the height of the battery container 6 and the liquid level A of the electrolyte 1o appears.

In a cathode absorption type sealed lead-acid battery, oxygen gas generated from the anode plate 4 is absorbed by the cathode plate 2 and reacted with the cathode plate 2. Most of the absorption and reaction portion occurs in the cathode plate 2 at both ends of the electrode plate group 1. The cathode plates 2' at both ends are responsible for both the discharge action and the gas absorption reaction action, and if there is a plate surface above the electrode plate group 1 that is not immersed in the electrolyte, However, the retainer 3 interposed between the two negative electrode plates is impregnated and held with an electrolytic solution, and the electrolytic solution 10 has a liquid level between Σ and member height of the electrode plate height I ]. The retainer 3 is always impregnated with a sufficient amount of electrolyte and is always in a liquid-rich state, thereby improving the performance of the lead-acid battery of the present invention and improving the cathode absorption reaction. is possible.

Figure 2 shows an example of the effect of the gas reaction efficiency and capacity on the liquid level height of the storage battery of the present invention. According to this figure, as the liquid level height increases, the gas reaction efficiency slightly decreases. However, under normal usage conditions (floating charge state), this is hardly a problem.

In this case, the cathode absorption reaction occurs in a so-called three-phase state by providing a gap 11 between the wall 9 of the battery container 6 above the liquid level and the cathode plates 2' at both ends of the electrode plate group 1. That is, a state is formed in which the electrode plate, electrolyte, and air (oxygen gas in this case) are in contact with each other, and the reaction with the oxygen gas generated from the anode plate 4 easily takes place at this portion. The reason why the liquid level height A of the electrolytic solution 10I is made negative from the electrode plate height i is that the effect varies slightly depending on the number of electrode plates and the electrode plate height and size. The retainer 3 used for sealed lead-acid batteries is a bag-shaped bag made of 4 glass fibers that is preliminarily filled with an electrolyte 1.
An electrode plate (anode plate 4 or cathode plate 2) is placed in the bag impregnated with
The electrode plate group 1 is constructed by inserting the electrode plate group 1 into the battery case 6. Even after inserting the electrode plate group 1 into the battery case 6, the electrolyte solution cannot be injected.
Normally, charging and discharging are performed using the electrolytic solution impregnated in the retainer 3I, but in the present invention, the amount of the electrolytic solution impregnated in the retainer 3 is further increased beyond this limited liquid level. In some cases, the absorption area of the cathode plate that absorbs the oxygen gas generated from the anode plate 4 is reduced, and the reaction action is inhibited. Therefore, the battery performance is improved by setting the amount of electrolyte within a range that does not affect the gas absorption reaction to the cathode.

As mentioned above, the sealed lead-acid battery of the present invention has an extremely good cathode absorption reaction, greatly improving battery performance, and has extremely great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a sealed lead-acid battery according to an embodiment of the present invention, and FIG. 2 is a characteristic curve diagram showing the effects of gas reaction efficiency and capacity on electrolyte level height of the sealed lead-acid battery of the present invention. be. 1 is the electrode plate group, 2 is the cathode plate, 2' is the cathode plate 3 at both ends is the retainer, 4 is the anode plate, 6 is the battery case, 9 is the wall, 10 is the electrolytic solution, A is the liquid level, 11 is the Cavity patent applicant

Claims (1)

[Claims] A retainer impregnated with electrolyte is interposed between the negative and anode plates,
In a cathode absorption type sealed lead-acid battery, which has a structure that prevents gas from escaping to the outside by absorbing oxygen gas generated from the anode plate during charging into the cathode plate and reacting with the cathode active material, the electrolyte level The height is set to 1 to 10 cm of the electrode plate height, and the gap between the cathode plates at both ends of the battery cell wall and the electrode plate group is set at 2 10 mm above the electrolyte surface (
A sealed lead-acid battery characterized in that a cavity is formed on one side of the battery.