How to check the lithium battery of an electric screwdriver. Video on the topic: How to check the battery of an electric screwdriver

Guide to action: how to check the battery of an electric screwdriver

Before engaging in the resuscitation of the battery, you need to find out what its capacity is at the moment. For professionals, this is elementary. There is a batter of batteries pendant. For lovers, for checking the battery capacity, you can use the following way: connect to the tested battery (charged) resistor of the corresponding face value, and by recording the current values ​​going through the resistor, and the voltage on it is brought the battery to a complete category. According to the data you receive, the discharge schedule is built, and its real capacity is determined. Of course, the accuracy of this method of determination is not characterized by ideal accuracy, so instead of a resistor, a stable current source is often used with an additional voltage source in the circuit.

To determine the real basic parameters of the battery, a check is carried out.

Battery elements can change their capacity

Checking the battery of an electric screwdriver is carried out when fully charged. The full check takes place in several stages.

Tools for verification

Checking the electric drive can be done using:

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The first stage of verification

So, half an hour after the start of charging, the voltage value will be 13 in. If you measure in another half an hour, then the voltage will be 13.5th century. 2 hours after the start of charging, the voltage will already be about 14 in. This suggests that the maximum is achieved. In a fully charged battery, the voltage has a value of equal to 17 in.

You can evaluate the quality of the drive by measuring the current during the charging process. If the battery is in good condition, then it is characterized by steady current growth of 1 hour during the charging process. Passing the value of the mark of 1 A indicates the normal functioning of the drive.

Some elements in the battery are non.Working

Based on the results of the first check, you can make an initial impression of the performance of the battery elements. This will help to establish the need to disassemble the battery.

Checking under load

To answer the question, for what time the battery is discharged, the drive should be checked under load. The load must be selected based on the power of the drive. If it is unknown, then it is believed that the load power is equal to half the work of the current force that is given the battery during operation, to the voltage of the drive. As a rule, this value is taken equal to 35–40 watts. Thus, as a load, you can use an automobile headlight (35 W) or use a 12-t-lamp with the same power.

The battery has a damaged element

Checking elements of the drive

So, let it turn out that with the help of preliminary checks, the presence of faulty elements in the drive was established. Then it is necessary to disassemble the battery and extract sequentially connected nutrition elements. “banks”. As mentioned above, the battery consists of 10-12 such elements with a voltage of 1.2 century.

After inspection, the voltage measurement of each of the “cans” should be measured. The voltage of one element should not be less than 1.2 century. When conducting measurements, the battery elements should be disconnected from the connections with all kinds of sensors. The measurement device is connected to the poles of the battery. “Banks” with reduced voltage are subject to replacement. If the simple measurement was not detected with simple elements, “banks” should be measured under load.

Resistance verification

The ability to normal functioning of each battery can be checked by comparing the “banks” in internal resistance. The value is determined by dividing the working parameters voltage into current strength and deduction of load resistance.

As a load, take a resistor with a resistance of 10 Ohms

For a better understanding, we give approximate calculations. Suppose, during the measurement under the load, data for one “banks” were obtained: working voltage. 1.19 V and labor current. 112 mA. Before making the calculation, do not forget to translate the value of the current force from ma to a. 0.112 a. We make appropriate actions (1.19/0.112). 10 = 0.63 Ohm. Recall that the resistance of the resistor load subtracted in our expression (10 Ohms).

Checking the remaining parameters

Each type of battery has a certain value of self.Discharge.

Checking the power elements for the presence of the “memory effect” is carried out by fully charging the battery and its full discharge. Produce several cycles of charge-discharge (3 or 4). The battery discharge can be carried out using a lamp in 12 in. In the course of actions, the residual operating voltage and idle voltage are measured. After repeated repeating the cycles, the “memory effect” will disappear.

Varieties of batteries

To date, the most common nickel-cadmium type of battery. Its undoubted dignity is considered:

The maximum voltage of an individual element reaches 1.38 volts.

Nickel-metallogid type is actually a competitor to the aforementioned type of battery. True, its parameters are much worse, but the elements are completely safe from an environmental point of view.

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The named batteries must be sent for storage in a charged state, otherwise after a month they will fail.

Relatively not so long ago, the battery began to produce for screwdrivers:

They are distinguished by a small size and a large container. There are two disadvantages:

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How to check the battery of an electric screwdriver by a multimeter

For the very first diagnosis, you need to determine the voltage and power of the battery during charging an electric screwdriver. Normally, the device should show 13V 30 minutes after connecting to the network. After 1 hour, the value will change by 0.5V.

The maximum voltage indicator of an electric screwdriver should reach 17V.

The current strength when connecting to the network in a well.Working device should reach more than 1 ampere in 1 hour.

The multimeter itself is transferred to the DC mode. To check the battery voltage. At the same time, the switch of modes must be put on the value of 20V. This means that the voltage value on an electric screwdriver does not exceed the value of 20 volts.

When measuring the voltage of an already fully charged electric screwdriver, the value should be equal to the number of “cans” multiplied by the voltage of each battery.

Typically, the amount of battery in the device is 10-12 pieces. With the tension of nickel-cadmium batteries in 1.2V, the required value will reach a maximum of 14.4V.

Methodology for determining the malfunction of the battery of an electric screwdriver

If you disassemble the battery body of an electric screwdriver, then inside you can detect sequentially connected nutrients. In most situations, the operating voltage of the electric motor is 18 volts, which are consisting of 15 can batteries in the battery housing. As a rule, some external signs of breakdown are not detected. Therefore, the master is faced with the task of correctly determining the link in the existing chain, which has lost its energy intensity.

The performance of the entire battery will lose its effectiveness even in that situation, if the system has at least one element that has lost its capacity. However, all the nutrient elements cannot fail. Therefore, having correctly discovered ineffective elements, they can either be replaced or returned to the operability of used batteries. In other words, there are methods to revive the nutrition elements.

As a rule, in order to accurately determine the battery malfunction, the practical application has found two main methods:

  • Identification of faulty blocks when using a tester (multimeter);
  • Identification of faulty supply elements in the system using the load

Consider how these methods work in practice.

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Testing batteries of the battery

To identify which of the “battles” of the battery is faulty, you need to fall out each and measure the voltage at the poles.

To connect to the device, the probes are used, one of which (red) is connected to a positive, and the second (black). To the negative pole of the drive. A value in volts will be displayed on the multimeter display.

The screws of the Makita brand with Li-Lon should show a voltage of 3.6-3.8V. This corresponds to the characteristics of lithium-ion batteries. In simple Chinese Budget Chinese models, the Russian Interskol with Ni-CD should be-1.4V, the minimum value is 1.2V.

It happens that the check in this way does not show any malfunctions, although the battery quickly sits down. Then check each battery with a light bulb (25 watts and 12V). The resistor is also used to measure the resistance level, for example, by 10 Ohms.

When they are connected to each other for a couple of minutes, the brightness should not change. If it goes out or flickers, then the drive has an insufficient capacity.

Also compare the resistance values ​​in all battery, having previously disconnected them from a thermal attewer.

The resistance level in the battery is calculated by the formula:

Where n is the voltage, a is the current strength, s is the resistance of the resistor.

Suppose the value of the first battery turned out to be 0.60 Ohms, and the second. 5 ohms. This means that the second battery is unsuitable for operation.

Nickel-cadmium battery can be restored if you try to make up for a lack of electrolyte. To do this, in the battery body from the minus, you need to make a hole with an awl. Pour 1 cube of distilled water with a syringe with a syringe. Clock the hole with epoxy glue and collect the battery.

All other types of “cans” (Li-lon, ni-mh) are not subject to restoration. In this case, you will need to buy a similar battery and replace.

The battery check helps to identify the cause of the inoperability of the battery and eliminate it. At the same time, funds are saved to buy a new device.

How to load the battery correctly

In order for the battery to work longer, you need to carefully follow the charging rules, especially immediately after the purchase. Due to violations of the rules, the “memory effect” and other problems appear most often. Here are the main requirements:

  • Different models have separate requirements.
  • The battery must be disconnected immediately after complete charging.
  • Ni-cd for long-term storage to leave discharged.
  • Ni-mh leave completely charged.
  • Li-Ion to store discharged not to the end.

The first time or after long-term storage, carry out several cycles of full charge-discharge. Before prolonged use, it is worth conducting at least the initial check of the battery, because even one faulty “bank” will violate the work of the entire device.

Express test method: measure u at the batteries of the battery

This method is even simpler, but with its help you can make a primary idea of ​​whether the battery is in order. If we hold measurements U without connecting the load, we will get an indicator equal to the “idle” tool.

For example, if we have 12 elements with a voltage of 1.2 volts each in the battery, and the working indicator U is 14.4 volts, U “idle” will grow up to 17 volts. If the “idle” voltage is less than the indicated, this means that there are “banks” in conjunction that failed and need to be replaced. Also, a decrease in idle voltage may mean that the battery is not fully charged.

Express test method: measure u at the batteries of the battery

This method is even simpler, but with its help you can make a primary idea of ​​whether the battery is in order. If we hold measurements U without connecting the load, we will get an indicator equal to the “idle” tool.

For example, if we have 12 elements with a voltage of 1.2 volts each in the battery, and the working indicator U is 14.4 volts, U “idle” will grow up to 17 volts. If the “idle” voltage is less than the indicated, this means that there are “banks” in conjunction that failed and need to be replaced. Also, a decrease in idle voltage may mean that the battery is not fully charged.

We test batteries of the battery

Когда первичная проверка показала, что АКБ работает неправильно, понадобится ее разобрать. Inside the case you will find elements resembling ordinary round batteries connected by sequentially metal conductors. Cans are usually 10 or 12. Each of them has a voltage of 1.2 volts or 1.38.

  • We fully charge the battery;
  • We disassemble;
  • We visually examine the chain (violation of contact may be the cause of the problem that has arisen);
  • We fall out of individual elements;
  • Check them with a multimeter (normal indicators are indicated above);
  • Banks issuing too small voltage are replaced by workers.

Nickel-cadmium elements can, in principle, try to restore. For this:

  • In the case, a hole is made with a thin awl;
  • Distilled water (about 1 cube) is poured inside the syringe;
  • The hole is clogged with epoxy glue.
  • The battery is collected.

In other cases, good elements are easiest to buy on a radio market. They will cost cheaper than a new battery. It is only important to choose banks that have completely similar parameters and type. That is, in a metroglide battery cannot be placed cadmium or lithium elements.

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