JP2847953B2 - Capacity inspection method for sealed lead-acid batteries - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for inspecting the capacity of a sealed lead-acid battery.

2. Description of the Related Art Conventionally, in a capacity test of a sealed lead-acid battery, discharge is continuously performed, and as shown in FIG. 1, the time required to reach a certain battery voltage is measured, so that the discharge capacity is measured and a non-defective product is measured. , Defective products were determined.

Problems to be Solved by the Invention However, in the above-described capacity inspection method, it is difficult to distinguish a non-defective product such as a defective weld from a defective product in a battery system having a large number of electrode plates.

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 method for inspecting a sealed lead-acid battery in which defective products can be easily identified.

Means for Solving the Problems To achieve this object, a capacity inspection method according to the present invention comprises:
In the first discharge, after discharging 50 to 100% of the discharge capacity of the battery system at that time, the second discharge is performed after a pause of 10 minutes or more, and the discharge voltage is measured by measuring the battery voltage at the end of discharge. In the case of a battery formed by using an unformed plate for both the positive and negative electrodes, a battery voltage is inspected by discharging during or after the formation of the battery case.

2. Description of the Related Art In recent years, as electric appliances have become lighter, batteries have also been required to be lighter and more compact. Along with this, it has become an issue how to design an appropriate concentration of sulfuric acid in the battery. Therefore, the sealed battery is designed so that the battery capacity is restricted by the amount of sulfuric acid supplied to the active material.

By performing this inspection method, it is possible to create a condition in which the change in the battery voltage depends on the amount of sulfuric acid as an electrolyte and the diffusion rate thereof, thereby making it easy to determine a defective product.

Example Three types of batteries A to C were prototyped under the specification conditions shown in Table 1 with a battery having a voltage and capacity of 6V10Ah (20HR).
Inspection was performed under the capacity inspection conditions shown in Table 2.

FIG. 2 is a diagram showing the relationship between the discharge state and the change in battery voltage.

The same positive and negative electrode plates were used for all batteries.

Table 3 shows the test results. The temperature condition is 25 ℃
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From Table 3, it can be seen that the inspection method according to one embodiment of the present invention makes it easier to determine a defective product than the conventional example. This is because the difference in the rate of sulfuric acid diffusion until the bias of the sulfuric acid concentration in the battery system is brought into an equilibrium state is used, that is, the recovery rate of the battery voltage when the discharge is stopped.

In addition, although the example of this invention showed the example which has many electrode plate structures, for example, in the case of a one-sheet / two-sheet structure, the first discharge may be 50% or more of the discharge capacity of the battery system, In the case where the number of electrode plates is large, such as the configuration of 5/6 plates shown in this embodiment, 100% discharge is required.

In the above embodiment, the method of inspecting the capacity of the battery using the formed electrode plate was shown.However, when the same inspection was performed during the formation of the battery case using the unformed electrode plate and at the end of the battery case formation, a welding defect was generated. Sulfuric acid was fixed as lead sulfate in the unformed electrode plate, and the absolute amount of sulfuric acid required for electric discharge was reduced, so that a more clear result was obtained.

Advantageous Effects of the Invention As described above, the present invention discharges 50 to 100% of the discharge capacity of the battery system at that time, and after stopping for 10 minutes or more, 2
By performing the second discharge and measuring the battery voltage at the end of discharge, a highly accurate inspection of the discharge capacity can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a change in battery voltage at the time of discharge in a conventional example, and FIG. 2 is a diagram showing a change in battery voltage at the time of discharge in an embodiment of the present invention.

──────────────────────────────────────────────────の Continuation of the front page (56) References JP-A-53-78029 (JP, A) JP-A-4-2066 (JP, A) Shiro Yoshizawa, “Battery Handbook” (Showa 50-4-15) Electric Shoin Chapter 3 pages 53-55 (58) Fields surveyed (Int. Cl. ⁶ , DB name) H01M 10/42-10/48 G01R 31/36

Claims (2)

(57) [Claims] In the first discharge, after discharging 50 to 100% of the discharge capacity of the battery system at that time, the battery is discharged for a second time after a pause of 10 minutes or more, and the battery voltage at the end of discharge is measured. A method for testing the capacity of sealed lead-acid batteries. 2. A sealed type battery as claimed in claim 1, wherein the battery voltage is inspected by discharging the battery formed in the battery case by using an unformed plate for both the positive and negative electrodes during or after the battery case formation. How to check the capacity of lead storage batteries.