JPS6264053A - Sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent overflow of electrolyte even when a battery is inverted or vibrated by a lateral turning by installing a spray arresting cylinder extending to the inside of a battery in a cover and an exhaust structure having an exhaust hole and a safety vent inside the spray arresting cylinder. CONSTITUTION:A spray arresting cylinder 3 extending to the inside of a battery from a cover 2 is installed, and an exhaust hole 5 and a safety vent 1 covering hole 5 are installed inside the cylinder 3, and the vent 1 is fixed in a safety vent fitting hole 4. When the battery was inverted, electrolyte 6 is blocked by the cylinder 3 and electrolyte overflow is prevented. Even if the vibration is applied, since the cylinder 3 is extruded above the electrolyte level, electrolyte overflow is prevented. In addition, since the lower opening of the cylinder is narrowed, the electrolyte 6 is difficult to enter the inside of the cylinder 3. Even if the electrolyte 6 enters the inside, since its volume is small and water head is low, it is blocked by vent closing pressure of the vent 1, and electrolyte overflow can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sealed lead-acid battery, and particularly to a sealed lead-acid battery in which the negative electrode absorbs and removes oxygen gas generated from the positive electrode.

Conventional technologySealed lead-acid batteries that absorb oxygen gas with a negative electrode are
The amount of electrolyte is limited, and sulfuric acid impregnated into the active material and separator is mainly used for the reaction. However, when charged with a large current, the electrolyte decreases due to water electrolysis, which shortens the lifespan of the electrolyte due to water. To prevent this, the active material and separator are often not impregnated with a so-called free electrolyte. In order to prevent the hot free electrolyte from leaking, it is recommended to place an absorbent cloak over the separator and impregnate the cloak with the free electrolyte when the separator is inverted, or to place an inner lid between the lid and the separator. , methods have been taken to prevent free electrolyte from easily reaching the safety valve.

Problems to be Solved by the Invention However, such conventional methods require separate parts such as the mat or the inner lid, resulting in the cost of three parts and assembly costs. The present invention has been made in view of the above, and provides a sealed lead-acid battery of a type that absorbs gas with a negative electrode that is excellent in temperature resistance without requiring any separate parts.

Means for Solving the Problems In order to solve the problems mentioned above, the present invention provides an exhaust structure that has a splash-proof cylinder on the lid that extends into the battery, and an exhaust port and a safety valve that covers the exhaust port inside the splash-proof cylinder. It has been established that
When the battery is upside down, the height of the splash-proof cylinder is higher than the level of the electrolyte that collects on the back of the lid.

Function: Due to the above-described structure of the present invention, the electrolyte that accumulates when the battery is upside down is not blocked by the splash-proof cylinder and becomes a bath liquid, and furthermore, even if the battery is placed on its side and receives vibration, the splash-proof cylinder directly acts as a safety valve. This prevents the electrolyte from adhering to the bath liquid due to vibration.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the main parts of a sealed lead-acid battery according to an embodiment of the present invention. A splash-proof cylinder 3 extending into the battery from the lid 2 is provided, and the splash-proof cylinder 3 has an exhaust port 6 and a safety valve 1 that covers the exhaust port 6, and the safety valve 1 has a safety valve insertion hole 4.
is fixed. The length of the splash-proof tube 3 is 35 mm from the back of the lid.
The inner diameter of the splash-proof tube 3 is made as small as possible, and the diameter at the lower opening is 11.2 Wff. FIG. 2 shows a state in which this battery is turned upside down. The battery of this example has 40 cc of free electrolyte per cell;
When completely inverted, the liquid level height from the back of the lid is 17 mm, blocked by the splash-proof cylinder 3, and there is no electrolyte bath liquid from the exhaust port 5. Furthermore, even if vibrations were applied, the electrolyte bath liquid could not be seen because the cylinder protruded above the liquid surface. Furthermore, since the lower opening of the splash-proof cylinder 3 is narrowed, even if the battery is suddenly turned upside down, the splash-proof cylinder 3
Almost no electrolyte 6 enters the inside of the tank, and the amount of electrolyte that does enter is very small, and the water head pressure is low and suppressed to the closing pressure of the safety valve, so that it does not leak into the bath.

FIG. 3 on page 5 shows a perspective view of a sealed lead-acid battery having a mount portion higher than the surrounding area on the top surface of the battery.

The cell having the mounting portion 7 has more space above the separator than the low cells on both sides thereof. Therefore, even if the battery falls on its side, the liquid level height in each direction is kept low, and the distance from the splash-proof cylinder provided at the center of the cell is large.
It has very high spill resistance.

Furthermore, Table 1 shows the presence or absence of bath liquid under each vibration condition when the ratio of the liquid level height H7 with the battery upside down and the height H2 of the splash-proof tube was changed.

Table 1 Vibration test results in upside down state From Table 1, it is clear that when the battery is held upside down, the height of the vane slope is more than twice the height of the electrolyte that accumulates on the back of the lid. For example, it has excellent vibration resistance.

Furthermore, if the splash-proof tube is extended, the safety of the vibration-proof and spill-proof property will be improved, but this is not preferable because it causes a decrease in resin flow during lid molding and a sharp increase in mold release resistance. Therefore, it is most practical for the height of the splash-proof cylinder to be approximately twice the height of the liquid level that collects on the back surface of the lid when the lid is upside down.

Effects of the Invention As described above, according to the present invention, there is no need to use separate parts that would increase part costs and work costs, and by having a splash-proof tube, there is no possibility of bath liquid even when the product is upside down. . Furthermore, it has excellent vibration and spill resistance even when laid down on its side.

In addition, by having a splash-proof tube and a safety valve inside it, even if the battery is suddenly turned upside down, the electrolyte that enters the splash-proof tube is restricted, and the water head pressure caused by this liquid is higher than the valve closing pressure. Since the water level can be kept low, there is no need to use bath liquid.

[Brief explanation of the drawing]

7 Page 7 Figure 1 is a cross-sectional view showing the main parts of a sealed lead-acid battery according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing the main parts of the same battery when it is turned upside down, and Figure 3 is a cross-sectional view showing the main parts of the sealed lead-acid battery according to an embodiment of the present invention. FIG. 1 is a perspective view showing an example of a sealed lead-acid battery having a mount part. 1...Safety valve, 2...Lid, 3-...
Splash-proof cylinder, 4. - Safety valve insertion "1.6... Exhaust port,
6... Electrolyte, 7... Mount part, 8...
Battery case, 9...terminal. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2, 5/do

Claims (3)

[Claims] (1) It has a splash-proof cylinder that extends into the battery from the lid, and an exhaust port and a safety valve that covers the exhaust port inside the splash-proof cylinder, and when the battery is upside down, the height of the splash-proof cylinder is on the back side of the lid. A sealed lead-acid battery that is characterized by a liquid level that is higher than the level of the electrolyte that accumulates. (2) The sealed lead-acid battery according to claim 1, which has a mount portion on the top surface of the battery that is higher than the surrounding area, and a splash-proof tube is formed on the back surface of the mount portion. (3) The sealed type according to claim 1 or 2, wherein the height of the splash-proof tube is approximately twice the height of the liquid level of the liquid that collects on the back of the lid when the battery is upside down. Lead acid battery.