JPH0672154U - Lead acid battery - Google Patents

Abstract

(57) [Summary] [Purpose] Even if a positive and negative electrode plate having feet on the bottom of the lattice is used, molten lead ions can be short-circuited by electrodeposition and deposition on the foot of the negative plate, growth, and contact with the positive plate. Provide a storage battery that has a low life and a long life. A positive electrode plate 1a is provided with a positive and negative electrode plate 1 having a foot portion 3 at a lower portion of a grid, and a separator 6 disposed between the positive and negative electrode plates 1. The positive electrode plate 1a is located at a lower position where the foot portion 3b of the negative electrode plate 1b faces. To
The cutout portion 2 has a width larger than the width of the negative electrode plate foot portion 3b. The creepage distance between the tip of the foot of the negative electrode plate and the lower portion of the positive electrode plate is longer than in the conventional case, and the time (distance) until the lead electrodeposited and deposited on the tip of the foot of the negative electrode plate contacts the positive electrode plate can be lengthened. Therefore, it is possible to reduce short-circuiting in the lower part of the electrode plate due to lead ion electrodeposition, and it is possible to prevent early life deterioration due to lower part short-circuiting.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lead storage battery.

[0002]

[Prior art]

 During use, lead-acid batteries often come to the end of life when the positive electrode active material falls off and accumulates at the bottom of the electrode plate group, causing a short circuit between the positive and negative electrode plates. In particular, when the product is subjected to severe vibration or the discharge is deep, the positive electrode active material is significantly detached, and the life is short due to a short circuit at the lower part of the electrode plate group.

Therefore, conventionally, in order to reduce short-circuiting at the lower part, a saddle is provided at the lower part of the battery case to collect the active material that has fallen off, or a foot part is provided at the lower part of the electrode plate to reduce the creeping distance between the electrode plates. A structure that makes it longer is adopted. As a result, the number of short circuits at the bottom of the electrode group due to the loss of active material has decreased.

When the foot portion is provided on the electrode plate grid, the foot portion is for the purpose of reducing the short circuit at the lower part of the electrode plate group due to the loss of the active material, and as shown in FIG. The height of the foot portion 5a and the height of the foot portion 5b of the negative electrode plate 4b are substantially the same.

[0005]

[Problems to be solved by the device]

 However, in such a storage battery, lead ions dissolved in the electrolytic solution due to charging are likely to be electrodeposited / precipitated on the tip portion of the foot portion 5b of the negative electrode plate 4b, and the lead ion is not deposited on the tip portion of the foot portion 5b of the negative electrode plate 4b. Since there is no separator 6 that serves to inhibit the growth of deposited lead ions, there is a problem that lead grown by electrodeposition / precipitation is likely to come into contact with the lower portion of the positive electrode plate 4a to cause a short circuit.

The present invention has been made to solve the above problems, and an object of the present invention is to use a positive and negative electrode plate having a foot portion at the lower portion of the lattice even if the negative electrode foot portion is used. The purpose of the present invention is to provide a storage battery with a long life by reducing the possibility of a short circuit caused by electrodeposition, deposition, and growth of lead that contacts the positive electrode plate.

[0007]

[Means for Solving the Problems]

 Therefore, a positive and negative electrode plate having feet on the lower part of the grid and a separator disposed between the positive and negative electrodes are provided, and the positive electrode plate is placed at a lower position where the negative electrode plate feet face each other, and the width of the negative electrode plate feet is different. The above problem can be solved by using a lead storage battery having a cutout portion with a much wider width.

[0008]

[Action]

 With this structure, the creepage distance between the tip of the negative electrode plate foot and the lower portion of the positive electrode plate becomes longer than before, and the time (distance) until the lead electrodeposited and deposited on the tip of the negative electrode plate contacts the positive electrode plate becomes longer. be able to. Therefore, it is possible to minimize short circuits in the lower part of the electrode plate due to lead ion electrodeposition, and it is possible to prevent early life deterioration due to short circuits in the lower part.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a positive electrode plate 1a of a storage battery according to an embodiment of the present invention, and 2 is provided at a lower position where a foot portion 3b of a negative electrode plate 1b (see FIG. 2) faces. It is a cutout portion having a width larger than the width of the negative electrode plate foot portion 3b. 3a is a foot of the positive electrode plate.

FIG. 3 is a diagram showing a configuration of an electrode plate group in which the positive and negative electrode plates 1 a and 1 b are stacked with the separator 6 in between.

FIG. 5 shows the life test results of the 55D23 type storage battery configured by using the above electrode plate group and the 55D23 type storage battery using the conventional positive electrode plate having no notch portion. The storage battery using the conventional plate group had a short life due to a short circuit at the bottom of the plate group, but the storage battery of the present invention showed excellent life characteristics.

After the test, the storage batteries according to the present invention were disassembled and examined. As a result, electrodeposition / precipitation of lead ions was observed in the lower part of the electrode plate group, but no short circuit was found. On the other hand, in the conventional storage battery, lead ions dissolved in the electrolytic solution were electrodeposited and deposited on the lower part of the plate group and reached the positive electrode plate, causing a short circuit.

[0014]

[Effect of device]

 As described above, the storage battery according to the present invention includes the positive and negative electrode plates having the legs on the lower portion of the grid and the separator disposed between the positive and negative electrodes, and the positive electrode plate is the lower portion where the negative electrode legs face. It is characterized in that it has a notch portion having a width larger than the width of the foot portion of the negative electrode plate at the position. As a result, even if lead ions dissolved in the electrolyte are electrodeposited / precipitated on the tip of the foot of the negative electrode plate and grow, it is possible to prevent contact with the lower part of the positive electrode plate and prevent a short circuit. Can be provided.

[Brief description of drawings]

FIG. 1 is a view showing a positive electrode plate according to the present invention.

FIG. 2 is a diagram showing a negative electrode plate.

FIG. 3 is a view showing an electrode plate group according to the present invention.

FIG. 4 is a diagram showing an electrode plate group of a conventional storage battery.

FIG. 5 is a diagram showing a life test result of a storage battery according to the present invention and a conventional storage battery.

[Explanation of symbols]

 1a Positive electrode plate 1b Negative electrode plate 2 Notch part 3 Feet part 4a Positive electrode plate 4b Negative electrode plate 5 Feet part 6 Separator

Claims (1)

[Scope of utility model registration request] 1. A positive electrode plate (1) having a leg portion (3) at a lower part of the electrode plate and a separator (6) arranged between the positive and negative electrode plates (1), wherein the positive electrode plate (1a) is A lead-acid battery having a cutout portion (2) having a width larger than that of the negative electrode plate foot portion (3b) at a lower position facing the negative electrode plate (1b) foot portion (3b).