JPH0238372Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lead-acid battery having a side short-circuit prevention structure of the electrode plate group.

In general, a lead-acid battery is composed of a positive electrode plate, a negative electrode plate, and a separator.As the charge/discharge cycle progresses, active material fine particles released from the positive electrode plate and lead ions dissolved in the electrolyte are deposited on the sides of the negative electrode plate. It is reduced and precipitated. This precipitate grows toward the side of the adjacent positive electrode plate, eventually leading to a short circuit. Conventionally, to prevent this phenomenon, the sides of the electrode plates are coated with acid-resistant insulating tape or fitted with synthetic resin frames, but these methods only increase manufacturing costs. This will lead to assembly inaccuracies and reduce its effectiveness.

The present invention is intended to eliminate the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings.

A positive electrode plate 3 is brought into contact with one surface of the separator 1, and a negative electrode plate 4 is brought into contact with the other surface which is brought into contact with a negative electrode plate 4.
Two vertical ribs 2' are provided at a distance of at least the width of They are in opposing contact to prevent the side portions of the negative electrode plate 4 from being exposed. Incidentally, a large number of vertical ribs 2 are provided on the surface of the separator 1 that is in contact with the positive electrode plate 3 in order to ensure the amount of electrolyte. The width of the separator 1 is larger than the inner dimension of the battery case, and when it is stored in the battery case 5 as a group of electrode plates, the end part 6 is folded back and comes into contact with the inner wall of the battery case 5, and the inner wall of the battery case 5 and the electrode plate By forming the partition space 7 between the group side part, it is possible to prevent the active material fine particles from the positive electrode plate 3 from directly moving to the side part of the negative electrode plate 4, and in addition, the flow of the electrolytic solution is prevented in the partition space 7. becomes smaller. This is because the sides of one of the electrode plates are covered, and the stirring effect due to gas generated from the side of the electrode plate is suppressed, and the positive electrode plate is inserted into the partition space 7 from above or below. Even if active material fine particles enter the battery case 5, they quickly settle to the lower part of the battery case 5, and have the effect of suppressing the reduction current. Further, due to the facing contact of the vertical ribs 2' and the contact of the end portion 6 of the separator 1 with the inner wall of the battery case by folding back, the electrical resistance between both sides of the positive electrode plate 3 and the negative electrode plate 4 increases. When the separator 1 is brought into contact with both sides of the positive electrode plate 3, the amount of active material fine particles released from the positive electrode plate 3 itself can be reduced, and even if the active material fine particles are precipitated on the side of the negative electrode plate 4, Even if it grows toward the side of the positive electrode plate 3, short circuits can be prevented because the side of the positive electrode plate 3 is not exposed.

As mentioned above, the present invention covers the side of one plate with vertical ribs provided on two opposing separators;
In addition, by making the width of the separator equal to or greater than the inside dimension of the battery case, both ends of the separator are folded back so that they come into contact with the inner wall of the battery case, thereby forming a partition space between the side part of the electrode plate group. , the electrode plates can be placed in the center of the separator along the vertical ribs, and the electrode plates can be easily opposed to each other in the electrode plate group, making assembly easier, and the movement of active material fine particles is suppressed by the partition space. In addition, since the electrical resistance between the side portions of the electrode plates increases, a lead-acid battery having a structure that reliably prevents side short circuits of the electrode plate group can be obtained, which has great practical value.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a separator according to an embodiment of the present invention, FIG. 2 is a plan view of the separator, and FIG.
The figure is also an explanatory view of the main parts showing a state in which the electrode plate group is housed in the battery case. 1 is a separator, 2 and 2' are vertical ribs, 3 is a positive electrode plate,
4 is a negative electrode plate, 5 is a battery case, 6 is an end of a separator, and 7 is a partition space.

Claims (1)

[Scope of utility model registration request] In a lead-acid battery in which a group of electrode plates in which positive electrode plates and negative electrode plates are alternately arranged with separators interposed therebetween is housed in a battery case, two separators are brought into contact with both sides of one electrode plate,
The side of one electrode plate is covered by opposing contact of vertical ribs provided on one side of each of the two separators at an interval equal to or greater than the electrode plate width, and the width dimension is equal to or greater than the inner dimension of the battery case. A lead-acid battery in which both ends of two separators are folded back and abut against the inner wall of the battery case, and a partition space is formed between both ends of the two separators and the inner wall of the battery case.