JP2964658B2 - Sealed lead-acid battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead-acid battery,
In particular, the present invention relates to a sealed lead-acid battery having an improved splash-proof structure of an exhaust port.

[0002]

2. Description of the Related Art The demand for sealed lead-acid batteries for small electronic devices such as VTRs has been rapidly increasing recently, and the performance has been remarkably improved with the progress of production technology.

Conventionally, as shown in FIG. 3, for example, this type of sealed lead-acid battery accommodates an electrode plate group 26 composed of a positive electrode plate, a negative electrode plate and a separator in a battery case 25, and has Is positioned above the electrode plate group 26 in a state of being bent into a U-shape, and is fixed between the shelves 27 of the electrode plate group 26, and further, the battery case 25 and the lid 23 are bonded with an adhesive,
Splash-proof paper 24 is arranged below the exhaust port 22 which also serves as an electrolyte inlet provided on the top surface of the lid 23, and the splash of the electrolytic solution due to gassing that occurs during the formation of the battery container adheres to the inside of the exhaust port 22. To prevent it from spilling out of the exhaust port 22.
There has been known a device that prevents such a problem. Also,
A safety valve 28 is attached to the exhaust port 22.

[0004] A sealed lead-acid battery having such a configuration is provided with a lid 2.
The electrolyte is injected from the exhaust port 22 of No. 3 and the formation is performed after the safety valve 28 is attached. The current formation method is that both the positive and negative electrodes are in the state of the battery case 25 in the state of an unformed plate.
The so-called battery formation is predominant in that the battery is built in the battery case, or only the negative electrode plate is assembled as an unformed plate, and the formation is performed in the battery case 25.

[0005]

However, in the above-mentioned conventional configuration, since the inside of the exhaust port 22 is not completely covered with the splash-proof paper 24, the droplets of the electrolytic solution are formed inside the exhaust port 22 during the formation of the battery case. Therefore, there is a problem that it is impossible to completely prevent overflow from the exhaust port 22.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a sealed lead-acid battery in which electrolyte does not overflow from an exhaust port during formation of a battery case.

[0007]

In order to solve this problem, a sealed lead-acid battery according to the present invention is provided with a U-shaped cross-section of a spray-proof paper around the inside of an exhaust port on the back surface of a lid, and the upper end of the side surface thereof. A part is provided in contact with the back surface of the lid, and the upper end thereof is in contact with the back surface of the lid in a direction perpendicular to the side surface of the splash-proof paper, and two sheets are provided in parallel with both sides near the inside of the exhaust port. A spray-proof plate is provided, and a lower surface of the exhaust port, and four peripheral surfaces of the exhaust port are provided with a splash-proof structure that wraps the splash-proof paper and the splash-proof plate.
Further, by contacting the upper end of the side surface of the splash-proof paper with the protrusion provided on the back surface of the lid, a gap is provided between the upper end portion of the side surface of the splash-proof paper and the back surface of the lid, The bottom part of the paper is abutted and fixed to the upper surface of the shelf of the electrode plate group.

[0008]

According to this structure, the sealed lead-acid battery of the present invention is formed during battery case formation because the lower surface inside the exhaust port and the four surfaces around the exhaust port are completely covered with the splash-proof plate and the splash-proof paper. As a result, the splash of the electrolyte solution does not adhere to the inside of the exhaust port.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sealed lead-acid battery according to one embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, around the inside of the exhaust port 2 on the back surface 9 of the lid, a splash-proof paper 4 having a U-shaped cross section is provided, and the upper end 4a of the side surface thereof is in contact with the back surface 9 of the lid. At right angles to the side surfaces of the splash-proof paper 4, the upper end 1 a thereof is in contact with the back surface 9 of the lid, and the two splash-proof plates 1 are parallel to both sides near the inside of the exhaust port 2.
(Only one sheet is shown on one side) is provided to form a splash-proof structure in which the lower surface of the exhaust port 2 and the four surfaces around the exhaust port 2 are wrapped with the splash-proof paper 4 and the splash-proof plate 1. Reference numeral 3 denotes a cover of the battery case 5, reference numeral 6 denotes an electrode plate group including a positive electrode, a negative electrode, and a separator; 7, a shelf of the electrode plate group 6; and 8, a safety valve provided above the exhaust port 2.

In the thus constructed splash-proof structure, the side near the lower portion of the exhaust port 2 is completely covered by the splash-proof plate 1, and the bottom surface of the exhaust port 2 and the remaining two sides are completely covered by the splash-proof paper 4. The spray of the electrolytic solution generated during the formation of the battery container does not adhere to the inside of the exhaust port 2.
Does not overflow from

On the other hand, when injecting the electrolyte,
The electrolyte penetrates into the electrode plate group 6 through the gap between the dustproof paper 4 and the dustproof paper 1, so that there is no problem.

A battery of the conventional configuration and a battery of the present embodiment were manufactured in a number of 300 each, a battery case was formed at the same time, and an overflow of the electrolyte was examined.
Overflow occurred in six (5.3%), but none of the configuration of the present example.

[0014] Even if a splash plate made of synthetic resin which does not permeate the electrolytic solution is used in place of the splash resistant paper 4, it takes a long time to inject the electrolytic solution. all right. Next, in FIG.
Is in contact with the protruding portion 18 of the back surface 19 of the lid, and thus is separated from the back surface 19 of the lid by the distance 20. Battery case 15
When the adhesive used for bonding the cover 13 and the cover 13 is dropped on the back surface 19 of the cover during production, or when the adhesive overflows on the back surface 19 of the cover when the battery case 15 and the cover 13 are fitted,
In the battery of the conventional configuration, since the splash-proof paper 14 absorbs the adhesive, the splash-proof paper 14 is solidified by the adhesive and loses the permeability of the electrolyte, and it takes time to inject the electrolyte. There was a problem that the space required for the liquid injection was completely filled with the adhesive and the liquid could not be injected .
In another embodiment , as shown in FIG.
The above problem does not occur because the interval 9 is provided in the interval 9.

As for the method of fixing the splash-proof paper 14, the splash-proof paper 14 is desirably located as close as possible to the exhaust port 12 in order to improve the splash-proof effect.
It is an effective means to mount and fix it on the shelf 17. In addition, by adopting the above-described structure, it is possible to use a smaller splash-proof paper than the conventional splash-proof paper, and at the same time, it is possible to adopt a common splash-proof paper by adopting a common splash-proof structure for various types of batteries. It is possible to share the splash-proof paper structure.

[0016]

As is apparent from the above description of the embodiment, according to the sealed lead-acid battery of the present invention, a pair of splash-proof plates integrated on the back surface of the lid are provided in parallel around the exhaust port. The inside of the exhaust port is completely covered by a splash-proof structure that wraps around the bottom surface and the four surroundings of the inside of the exhaust port with a splash-proof plate and a U-shaped cross-section paper. Since the generated electrolyte splash does not adhere to the inside of the exhaust port, it does not overflow from the exhaust port. Also, by providing a space between the upper end of the side surface of the splash-proof paper and the back surface of the lid, it is possible to prevent the splash-proof paper from absorbing the adhesive, and it takes time to inject the electrolyte. There is no problem that the liquid cannot be injected. In addition to raising the splash-proof effect by placing the splash-proof paper on the shelf of the electrode group and fixing it,
Splash-proof paper can be made small and can be shared with many types of batteries.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a splash-proof structure of a sealed lead-acid battery according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a sealed lead-acid battery according to a second embodiment of the present invention, in which the splash-proof structure is partially cut away.

FIG. 3 is a partially cutaway perspective view showing a splash-proof structure of a conventional sealed lead-acid battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Splash-proof board 1a Upper end of a splash-proof board 2 Exhaust port 4 Splash-proof paper 4a Upper end of a splash-proof paper 9 Back of lid

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Kobayashi 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-61-140056 (JP, A) JP-A-63- 170848 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01M 2/14, 10/06

Claims (3)

(57) [Claims] 1. A splashproof paper having a U-shaped cross section is provided around the inside of an exhaust port on the back surface of a lid, and the upper end of the side surface is in contact with the back surface of the lid. At right angles, two splash-proof plates are provided in parallel on both sides near the inside of the exhaust port, with the upper end portion abutting on the back surface of the lid, and the lower surface of the exhaust port and the periphery of the exhaust port 4. A sealed lead-acid battery having a splash-proof structure whose surface is wrapped with the splash-proof paper and the splash-proof plate. 2. A gap between the upper end of the side surface of the splash-proof paper and the back surface of the lid by contacting the upper end of the side surface of the splash-proof paper with a protrusion provided on the back surface of the lid. The sealed lead-acid battery according to claim 1 provided. 3. The sealed lead-acid battery according to claim 1, wherein the bottom of the splash-proof paper is fixed in contact with the upper surface of the shelf of the electrode plate group.