JP2005056632A - Water replenishing device for storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water replenishing device capable of stably replenishing water without causing dispersion of a water replenishing quantity to each storage battery, in a collective water replenishing device for a storage battery having a water cut-off valve in conjunction with height of an electrolyte surface. <P>SOLUTION: This water replenishing device for a storage battery comprises: a water replenishing plug 2 having the water cut-off valve in conjunction with height of an electrolyte surface; a water injection tube 3; a water injection tank 4; a joint part 6 for connecting the water replenishing plug to the water injection tube; and a joint part for connecting the water injection tube to the water injection tank. When it is assumed that the inside diameter of the joint part between the water injection tube and the water replenishing plug and the inside diameter of the joint part 5 between the water injection tank and the water injection tube are A and B, respectively, the water replenishing device has a relationship of 0.13≤A/B≤0.16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rechargeable water storage device.

In a secondary battery using an aqueous electrolyte as the electrolyte, electrolysis of water in the electrolyte (H ₂ O = H ₂ + 1 / 2O ₂ ) occurs as a side reaction during charging, and the amount of electrolyte is It will decrease. For example, in a lead-acid battery, the above reaction starts at the end of charging, and water further decreases when overcharged. Therefore, the concentration of dilute sulfuric acid, which is an electrolytic solution, gradually increases as charging and discharging are repeated. As the concentration increases, the charging reaction efficiency decreases, charging becomes difficult, and the capacity gradually decreases. Furthermore, when the concentration of the electrolytic solution increases, corrosion of the positive electrode plate tends to be promoted. Therefore, it also has a problem of shortening the service life. In order to prevent this problem, it is necessary to replenish water periodically to keep the concentration of dilute sulfuric acid constant.

  Further, the secondary batteries are often used at a high voltage, for example, 24V or 48V, by connecting a large number of them. In that case, it is a very troublesome work to periodically replenish water to a large number of storage batteries to adjust the concentration and amount of the electrolyte. As a countermeasure, in recent years, an apparatus that can replenish water to a large number of storage batteries in a short time has been increasingly used.

  As one of them, a batch water replenishing device for a storage battery having a water faucet having a water stop valve interlocked with the electrolyte surface level is raised. In the case of this water replenishment device, it has a mechanism that replenishes water and stops the water replenishment by the function of the water stop valve when the electrolyte level reaches the specified liquid level. It has been found that there is a problem that the electrolyte surface height of the storage battery varies.

  FIG. 2 is a cross-sectional view of an essential part showing an example of a water faucet having a water stop valve interlocked with the electrolyte level, 2 is a water faucet, 6 is a water injection tube (not shown in FIG. 2), and the water faucet 2. , 9 is a water stop valve provided on the water faucet, 10 is a valve seat, and 11 is a float that moves up and down in conjunction with the electrolyte level.

  As shown in FIG. 2, the water that has entered the water faucet 2 through the joint portion 6 is injected into the storage battery 1 (not shown in FIG. 2). At that time, the float 11 rises as the liquid level rises due to refilling, and the water stop valve 9 of the water faucet 2 rises accordingly, and when the water level reaches a specified electrolyte level, the water stop valve 9 is fitted to the valve seat 10 to stop the inflow of water into the storage battery.

  However, as a result of examining the water faucet 2, the flow rate of water supplied to the water faucet mounted on each lead-acid battery varies, and when the flow rate is large, the water pressure applied to the water stop valve 9 is strong. The water stop valve operates at an early stage, and the water replenishment stops by fitting into the valve seat 10 before reaching the specified electrolyte surface height, and the electrolyte surface height after the water replenishment is lowered. If the flow rate is low, rehydration takes time and the water pressure applied to the water stop valve is small. Therefore, the water stop valve 9 does not fit into the valve seat 10 even though the electrolyte surface has reached the specified value, and water replenishment is continued and electrolysis is continued. It was found that the liquid level tends to be higher than the specified liquid level.

  The problem to be solved by the present invention is a water replenishing device having a water faucet having a water stop valve interlocked with the electrolyte surface level, and capable of performing stable water replenishment without variation in the amount of water replenished to each storage battery. Is to provide.

  According to claim 1, as means for solving the problem, a water faucet, a water injection tube, a water injection tank, a water supply tap, and a water supply valve having a water stop valve interlocked with the electrolyte surface height of the storage battery are connected. A water storage water replenishing device comprising a joint portion, a joint portion connecting the water injection tube and the water injection tank, wherein an inner diameter of the joint portion between the water injection tube and the water faucet is A, and the water injection tank and the water injection tube When the inner diameter of the joint portion is B, the relationship is 0.13 ≦ A / B ≦ 0.16.

  As described above, the inventor of the present application has determined that the amount of water supplemented by the water replenishing device varies due to variations in the amount of water supplied from the water injection tank to each water faucet. It was found that the water stop valve of the water faucet operates stably and the liquid level height after water replenishment is stabilized by setting the water content within the above range. As the means, the water replenishing apparatus has an orifice mechanism, and when the inner diameter of the joint portion between the water injection tube and the water faucet is A and the inner diameter of the joint portion between the water injection tank and the water injection tube is B, 0 By maintaining the relationship of .13 ≦ A / B ≦ 0.16, the amount of water supplied to the water faucet falls within a certain range, the water stop valve of the water faucet operates stably, and the electrolyte level height increases. It was found that the variation in depth could be prevented, and that the rehydration time was hardly affected. That is, when 0.16 <A / B, the amount of water supplied to the water faucet increases, the water stop valve operates early, and the electrolyte surface height decreases. On the other hand, in the case of 0.13> A / B, the amount of water decreases, the water replenishment time becomes longer, the operation of the water stop valve is delayed, and the electrolyte level tends to be too high.

  As described above, in a water replenishing device capable of replenishing a battery pack connected to a large number of storage batteries, the inner diameter of the joint between the water filling tube and the water faucet is A, and the joint between the water filling tank and the water filling tube When the inner diameter of the part is B, the water stop valve of each water faucet operates stably by maintaining the relationship of 0.13 ≦ A / B ≦ 0.16, and the electrolyte level height of each storage battery is It is always kept constant, a stable life performance is obtained, and its industrial effect is extremely large.

  The present invention will be described in detail based on examples.

  FIG. 1 is a plan view schematically showing an embodiment in which a batch water replenishing device according to the present invention is mounted on a 48V lead acid battery (assembled battery) for an electric forklift. 1 is a lead acid battery having a capacity of 400 Ah in a 5-hour rate discharge. 2 is a water faucet equipped with a water stop valve (not shown in FIG. 1) interlocked with the electrolyte level of the storage battery, 3 is a water injection tube, 4 is a water injection tank, 5 is the water injection tank and the water injection tube. A joint portion to be connected, 6 is a joint portion for connecting the refill faucet 2 and the water injection tube 3, and 7 is a water stop valve provided in the water injection tank.

  FIG. 1 shows the flow of water during replenishment with arrows. The water in the water injection tank 4 reaches the joint portion 6 between the water faucet 2 and the water injection tube 3 through the water stop valve 7, the joint portion 5 between the water injection tank and the water injection tube, and the tube 3. And supplied to each lead-acid battery 1.

  The inner diameter of the joint portion 6 between the water faucet 2 and the water injection tube 3 is indicated by A in FIG.

  FIG. 3 is a perspective view schematically showing a main part of a joint portion 6 between the water faucet 2 and the water injection tube 3, and the same reference numerals as those in FIG. Here, the inner diameter of the joint portion 6 is indicated by A.

  FIG. 4 is a schematic view showing the joint portion 5 between the water injection tank 4 and the water injection tube 3, and the inner diameter of the joint portion 5 is indicated by B. The same reference numerals as those in FIG.

  As shown in FIGS. 2, 3, and 4, the ratio (A / B) of the inner diameter A of the joint portion 6 between the water faucet 2 and the water injection tube 3 to the inner diameter B of the joint portion 5 between the water injection tank 4 and the water injection tube 3. ) Between 0.13 and 0.16, the amount of water supplied to the water faucet 2 is controlled within a certain range by the effect of the orifice, and the water stop valve installed in the water faucet 2 It was found that No. 9 operated normally and the electrolyte level was kept constant, and that the water replenishment time was not affected within this range.

  Next, the results of tests conducted to clarify the effects of the present invention will be described.

  First, a 48V assembled battery in which 24 cells of lead storage batteries having a capacity of 400 Ah in the 5-hour rate discharge shown in the Examples were connected in series was prepared. These storage batteries were subjected to supplementary charging for a certain period of time, and the electrolyte height of each lead battery was reduced by 13 mm to 15 mm from the specified liquid level. This is equivalent to reducing the water content of the electrolyte from 350 to 400 ml.

  Next, when water replenishment is performed by connecting the water replenishing device shown in FIG. 1 to the assembled battery, the inner diameter B of the joint 5 between the water filling tank 4 and the water pouring tube 3 of the water replenishing device, the water faucet 2 and the water pouring tube 3 What prepared various changes in the ratio of the joint portion 6 to the inner diameter A of the joint portion 6 was prepared. The contents are shown in Table 1.

The water level in the water injection tank 4 was kept constant, the water stop valve 7 was fully opened, and water was replenished, and the dispersion of the liquid level from the specified electrolyte surface level after water replenishment and the time required for water replenishment were measured. . The evaluation of the dispersion of the electrolyte level after replenishing water is obtained by calculating the average value of the difference (mm) between the electrolyte level of the 24 lead-acid batteries and the specified liquid level when water is replenished by changing A / B. The standard deviation values were compared. Moreover, the water replenishment time in each condition was represented by the ratio when the water replenishment time when A / B is 0.25 is 1.0. The results are shown in Table 1.

  As shown in Table 1, it can be understood that when the A / B is as large as 0.2 or 0.25, that is, when the amount of water flowing into the water faucet 2 is large, the variation in the electrolyte surface height is large. On the other hand, the product of the present invention in which A / B is set to 0.13 ≦ A / B ≦ 0.16 has no effect on the rehydration time, and can greatly reduce the variation of the electrolyte level after replenishment. I understood. On the other hand, in the case of 0.13> A / B, the dispersion of the electrolyte surface height was increased and the water replenishment time was significantly increased.

  In addition, although this test was done about the assembled battery in which the lead acid battery was connected in series with 48V, the same result was obtained even with the thing of 24V series connection.

  In the examples, a lead-acid battery has been described. However, the lead-acid battery is not limited to a lead-acid battery, and a secondary battery using an aqueous electrolyte solution undergoes electrolysis of water in parallel with the charging reaction during charging, and the amount of electrolyte solution It goes without saying that the collective water replenishing device of the present invention can be applied to an assembled battery in which a large number of batteries that decrease in number are connected.

  Moreover, although the Example demonstrated the water replenishment apparatus which replenishes the assembled battery which connected many storage batteries collectively, the internal diameter of the joint part of the water injection tube of this invention and a water supply stopper is set to A, a water injection tank and a water injection tube Of course, the relationship of 0.13 ≦ A / B ≦ 0.16 can be obtained even when applied to a water replenishing device that replenishes one storage battery, where B is the inner diameter of the joint portion. Absent.

The principal part top view which shows typically the Example of the package water replenishment apparatus of this invention The principal part sectional drawing which shows the joint part of the water faucet and water injection tube of a package water replenishment apparatus, and the said water faucet. The principal part perspective view which shows typically the joint part of a water faucet and a water injection tube. Schematic diagram showing the inner diameter B of the joint between the water injection tank and the water injection tube of the batch water replenishing device

Explanation of symbols

1 Lead storage battery 2 Refill valve with water stop valve linked with electrolyte surface height 3 Water injection tube 4 Water supply tank 5 Fitting portion connecting the water injection tank and water injection tube 6 Fitting portion connecting the water supply tap and water injection tube 7 Water injection Stop valve provided in the tank 9 Stop valve provided in the faucet 10 Valve seat provided in the faucet 11 Float

Claims (1)

A water faucet having a water stop valve interlocked with the electrolyte surface level of the storage battery, a water injection tube, a water injection tank, a joint portion connecting the water supply tap and the water injection tube, and a joint portion connecting the water injection tube and the water injection tank A water storage replenisher comprising:
When the inner diameter of the joint portion between the water injection tube and the water faucet is A and the inner diameter of the joint portion between the water injection tank and the water injection tube is B, the relationship of 0.13 ≦ A / B ≦ 0.16 is established. A water-retaining device for a storage battery, comprising:

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