How to disassemble the battery of a screwdriver Devolt. Choosing Li-Ion Battery

How to repair a screwdriver for a screwdriver: determining a malfunction and restoration

How to repair a screwdriver for a screwdriver is a frequently asked question among home masters, because this device has almost every owner in the arsenal. The main advantages of the tool functioning from the battery consider compactness, the ability to work with it even at altitude (due to the lack of power supply). Nevertheless, the battery of this device may fail, and purchase a new one. Is unprofitable, because its price sometimes reaches 60% of the cost of the tool. Therefore, it is recommended to try to restore the battery. How exactly, we will tell you today.

Despite the variety of models of these tools, the battery has a similar appearance in all screwdrivers. It is a plastic box, where there are many components of nutrition. They are fixed with each other in a single chain so that the wiring of the “banks” on both sides is closed to contacts, which provide power to the screwdriver.

All batteries have a primitive structure, which even an inexperienced master can figure out a little familiar with electrical engineering. In addition to power parts in the box of the unit, it is often located:

  • Thermoresistor. Allows you to control the temperature of the cans during charging;
  • Thermal switch. Automatically blows out parts of the circuit in case of battery overheating;
  • Control and control payment (only for lithium-ion batteries).

Elimination of memory effect

Not always restoration of the battery of a screwdriver requires any radical actions. Often to restore the battery capacity, alternating complete charging (to the extinguished charging light) and the full discharge of the battery helps. This method is also called “swing the battery”.

Разборка Li-ion аккумулятора и Возгорание! / Disassembly Li-ion battery, and fire!

How to erase the battery memory effect

It is associated with the so.Called “memory effect” and is characteristic of the batteries of the screwdriver based on nickel. And it is especially strongly manifested in nickel-cadmium. It occurs when the battery discharged to zero does not fully charge and begins to operate or vice versa. This leads to enlargement of the crystals of the active substance, which reduces the area of ​​its active surface.

Follow the recommendations of the manufacturer for the charge and discharge modes.

The so.Called “training” of the battery helps to remove this effect or significantly reduce it. It consists in repeating the cycles of full charge and discharge.

For this, the restored battery is completely discharged, using, for example, a light bulb. Then they are completely charged and discharged again. Repeat the process of 5 times and if the individual elements of the battery are working, the characteristics will return to the norm or close to it.

Replacing cans is complete or partial

If the screw of the screwdriver “rally” failed to restore the battery, you will have to change the batteries. Any battery of a screwdriver is a chain of sequentially connected batteries. With this type of connection when “subsided” one element, the entire battery has a reduced charge and quickly discharges. Over, the characteristics deteriorate as much as the most faulty bank “sank”.

How to restore the battery of a screwdriver: complete or partial replacement of cans

So you can restore the battery in two ways. The first is to find the same “sagging” elements and replace them. The second is to change “everything in a skew”. The second option is more invoice for money, but more “long.Playing”. In the first option, the rest, while working banks, will soon also pass. It will be necessary to repair the battery again. So it is desirable to choose the second method.

Determining the malfunction and restoration of the screwdriver battery

Before proceeding with the battery repair, it should be determined by its malfunction, otherwise the repair will be quite difficult or completely impossible. It should be noted that the failure of all the elements of the battery is impossible, with the exception of rare cases when a long.Term closing of the battery terminals could occur.

To determine the malfunction follows:

  • Put the battery on charging and wait until it is fully charged.
  • After that, disassemble the case, and measure the voltage of each charger. The difference in voltage in banks for nickel-cadmium batteries can be in the range of 1.2-1.4 V, and the difference in lithium can be about 3.8 V.
  • Banks with voltage are less than the nominal, you should mark. After that, the battery must be assembled again and give it the full load until tangible discharge.
  • Then disassemble the battery again and by the new measurement of the voltage of each can.
  • Typically, the largest voltage subsidence will be in marked elements that will need to be “reanimated” or simply replaced.

If a voltage of 12 V is necessary for the work of a screwdriver, you can try to find faulty elements in a simpler way. For this you need:

  • Carry out the battery, then disassemble it and measure the tension of each element.
  • Then, with the help of a 12 volt bulb, completely discharge it and measure the voltage of all elements again to determine which of them are faulty.

Электрический шуруповерт, который крутит все Stanley Fatmax Li-ion 18 В 2 Ач

Instead of a light bulb, you can use the appropriate resistor.

Repair and replacement of the elements of the screwdriver battery

The most effective method is how to restore the screwdriver of the screwdriver is Simple replacement of failed chargers, which were discovered during their verification.

To repair, you need a donor, that is, a second battery, which also has failed banks, if this is not, you can purchase new elements via the Internet. Today there are enough online stores who are ready to deliver new batteries directly to the house with a courier service.

Important. Acquired elements should clearly coincide with the replaced tanks and dimensions.

disassemble, battery, screwdriver, devolt, li-ion

For repair, you will need to prepare: a soldering iron, tin solder and alcohol flux (preferably).

The process of replacing charging elements itself does not provide any complexity, if only there was a solder skill.

Restoration of the screwdriver battery

Attention. In order not to harm the battery when working with a soldering iron, the soldering must be done quickly.

To connect the elements, it is recommended to use native plates, and if it is impossible to use them, completely replace them with the same size, but from copper. This is necessary for the correct charging process. With a different section of the connecting plates between the elements, they will heat up, and of course, the termistor will constantly work to protect the charging cans.

You need to carefully take the assembly of the batteries. The connection must be consistent. The minus of each battery is connected to the plus of the next element.

After the full assembly of all elements, it is made alignment of their potentials, Since they will be different at this time. To do this, you need to carry out a certain charging cycle/discharge. The renovated battery is completely charged, after which it should stand for about a day. After a day, it is necessary to measure the voltage separately of all elements, and if the assembly was made correctly, the voltage indicator of each element must correspond to 1.2 V.

After that, the battery should be completely discharge again. To do this, the assembled battery, using a screwdriver, is given a complete maximum load before its full discharge. The main thing is not to overload the screwdriver itself so that it does not have to repair it in the future. This charging/discharge procedure must be repeated several times in a row.

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In the same way, approximately every three months, it is recommended to carry out the procedure to erase the “memory effect”, which will extend the operation of the battery and the screwdriver itself.

Breakage in the electric part. How to identify and eliminate

The drill and screwdriver have a lot in common, but the difference lies in the torque. If the drill is designed to drill holes in different materials, then the main purpose of the screwdriver is the screwing of self.Tapping screws. If there is a speed controller, this tool can be used to drill and polish surfaces. It can also be used to mix solutions (only if small volumes). Cases of malfunction of the electrical part, which are manifested by the following factors: are not rare:

  • When you press the Start button, the tool does not show signs of life
  • When switching reverse. This option does not work
  • The speeds are not adjusted

To deal with such breakdowns, you need to first find out what reasons contribute to such malfunctions.

Electric diagram of alteration of a screwdriver for Li-Ion Battery

Before replacing the batteries in a screwdriver, it is recommended to prepare the correct assembly scheme. To exclude the failure of any components, it is necessary to accurately observe the polarity of the connection.

List of necessary tools

The following tools may need to carry out repair work:

  • Multimeter. This device is necessary to measure alternating and constant voltage.
  • Curly and flat screwdrivers. Come in handy for disassembling the screwdriver housing.
  • Soldering iron. Inexpensive models with a capacity of about 40 watts are suitable for repair.

Determination of a malfunction

We figured out the purpose of the structural structural elements, now we will consider how to determine the malfunction, this is.2 repairs of the screwdriver battery. We immediately note that all elements cannot fail at once, and since our chain is consistent, when one element is released, the whole chain does not work. So, our task is to determine where we have the weakest link in the chain.

To do this, we will need a multimeter, and for the second method of searching for a 12V lamp, if your battery on a screwdriver is also 12 voltage. The procedure is as follows:

Thus, we found candidates for “resuscitation” or “amputation” and replacement for new elements.

If your screwdriver works from a voltage of 12 or 13V, you can search a simpler method. We disassemble a fully charged battery to the contacts “” and “-” connect a 12 volt lamp. The lamp will be a load and will discharge the battery. Next, we take measurements on the elements of the battery, where the voltage drop is most strongly, there is a weak link.

There are other ways, instead of a lamp, you can choose resistance, but for this the basics of electrical engineering are already needed, and it is doubtful that the resistor with the necessary resistance was at hand.

Other malfunctions are very rare. For example, the loss of contact at the rations of batteries or power contacts of the block, failure of the termistor. This problem is more inherent in fakes. In view of the rarity, we will not FOCUS on, we limit ourselves to the elements of the battery.

We figured out the “problem” elements, it is necessary to repair. How to repair a screwdriver battery? In general, 2 ways are available for repair, so to speak. This is the restoration and replacement of the elements that have become unusable.

Features of the battery in screwdrivers

Having opened the case, you can see the cassette of elements that provides the necessary voltage. Batteries are called “banks”, they are usually standard and voltage. Their difference is only in the container, which is indicated on the battery cylinder. The higher the power of the battery, the longer it will work.

It is better to have two batteries so that when working with one, you can charge the second.

Lithium-ion batteries contain a controlling fee, and elements are protected by a body or film. If lithium decomposition, then such batteries are not subject to restoration.

Some nickel batteries have a thermal attemptier. Nickel-cadmium batteries can be restored.

The screwdriver of the screwdriver is disconnected and the malfunction is determined. Effective method for repairing batteries. Replacing faulty elements or “cans”.

The operating instructions are not recommended to disassemble and change the screwdriver battery. But the price of the battery is more than half the cost of the tool. Not everyone’s to buy a new tool, so some masters disassemble, repair, restore and change the main elements of the battery.

disassemble, battery, screwdriver, devolt, li-ion

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Repair of the battleship battery

Lithium batteries are increasing in everyday life. Currently, they are increasingly found as interchangeable batteries for screwdrivers and other power tools. Despite their advantages, lithium batteries are also not deprived of shortcomings.

So, after 1.5 years of operation, the batteries from the screwdriver DeWALT began to discharge quickly, it became impossible to work. The batteries were charged up to a maximum of 14.4 volts, although the standard DCB-107 charger was used for this. In addition, charging took place very quickly, instead of 60 minutes, from the strength of about 15 minutes.

Before talking about how I managed to solve this problem, I would like to introduce the reader to the device of the lithium battery from the screwdriver.

This is what the standard DCB-145 battery looks like a full-time battery.

Cordless Screwdriver battery replacement/upgrade

To open such a battery, a hexagonal screwdriver of the Torx type is required. The battery consists of 4 lithium (Li-ion) “cans” Samsung SDI INR18650-13B with a capacity of 1300 ma/h each. All four “banks” are installed in a plastic box and connected sequentially using live plates. The plates are welded to the contacts of batteries with point welding. It can be seen that this is a high.Quality factory assembly.

I do not advise you to share the “banks” of the composite battery, sniffing connecting live plates. I did so and regretted. Next, I’ll tell you why this is not worth doing.

Samsung SDI INR18650 batteries themselves-13b do not have a built.In charge/discharge controller. Unfortunately, find documentation for batteries specifically for this model (with index 13b) I did not succeed. But, judging by the parameters of the batteries of this line, the maximum continuous current current (Max Continous DischaRge Current) can be from 18 (INR18650-13l) up to 23 (INR18650-13m) ampere! It is not surprising that they do not have a built.In controller.

There is also a 5-contact connector and a small printed circuit board in the battery housing.

A multi-conciliate connector is necessary so that when charge it is possible to control the charge of each of the four accumulators INR18650-13B separately. As you know, voltage is more than 4.1

4,2V for lithium batteries is dangerous and can lead to damage or even fire. Therefore, the charger levels (balances) the current through each “bank” of the composite battery so that the voltage on each of them does not exceed 4.1V.

Also, a temperature sensor is installed on the printed board, which adjacent to one of the lithium “cans”.

Thanks to the sensor, the standard charge DCB-107 measures the battery temperature and turns off the charge mode if the battery is overheated or has a temperature below 4 0 C. In addition to a thermal attenter, some scheme is mounted on the board, but it is filled with sealant.

Such a battery assembly is called “Pack for Power Tool”, That is,” Package “or battery assembly for power tools. This is how she looks like.

Large companies like Samsung supply such assemblies for manufacturers of power power tool on order. Perhaps that is why I could not find accurate characteristics for the Inr18650-13B batteries.

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We got acquainted with the LI-ION battery for the power tool. Back to our “dead” batteries.

Before the batteries “died” they were very discharged. They used a screwdriver until the battery was discharged, and then, having made a break, they worked for them for some more. After that, the batteries began to charge poorly, and did not hold the capacity.

After measuring the voltage on each “bank” of the battery, it turned out that 3 “banks” out of 4 were charged not with whiteness. Up to 3.5 volts. Only one charged to the required 4.1 volts (for Li-Ion).

If we add the voltage of all cans, we will get just the same 14.4V. Let me remind you that the standard charger very quickly charged the battery and turned off.

The first thing that came to mind was to replace those lithium “banks” that were not fully charged. But the search for original Inr18650-13b did not give results. Perhaps due to the fact that such assemblies are delivered only to order and do not enter retail. And the cost of four new batteries, for example, INR18650-22R almost equal to the price of one battery DeWALT DCB-145. Therefore, I decided to refuse from the replacement of batteries at that time.

And, a good thought came to my mind, and as always, it is late. That if the standard charging could not correctly eye the composite lithium battery after a deep discharge? That is, the full.Time Devolt’s charging charged one “bank” to the required 4.1V and disconnected. At the same time, the remaining 3 lithium “banks” were not fully charged, but only up to 3.5V.

It was decided to check the standard DCB-107 charger for the presence of any malfunction, but it turned out to be regular. And the new batteries charged the new batteries perfectly.

Thus, I came to the conclusion that the standard charger could not correctly eye the composite lithium battery after deep discharge.

It was decided to defuse/charge each 18650 lithium can separately using a third.Party charger. For this, a charger was used Turnigy Accuccell 6 (analogue IMAX B6), which I already talked about.

Discharged each jar of 18650 to 3V current 0.3A. Then charged up to 4.1V with a current 0.5a. Then he again discharged with the aim of determining how much the current was poured into each specific “bank”. This is necessary in order to evaluate their capacity. As it turned out, the batteries are working and in each of them was “flooded” from 1164 before 1186 ma. That not so far from the declared capacity of 1300 ma/h. Thus, I was convinced that the batteries are working, and you should not replace them.

How the screwdriver battery works

AKB or battery battery is composed of sequentially connected elements. Each has an electrolyte, electrodes. Depending on the type of raw materials used in the manufacture of raw materials, batteries are divided into several varieties.

  • Nickel-metallhydrid (ni-mh)-less common due to high cost. The pluses of devices include a large container, a lower level of self.Discharge, the absence of toxic substances in the composition. Long.Term storage in a discharged state leads to an uninvited loss of part of the properties. When in the conditions of negative temperatures, their power falls.
  • Nickel-cadmium-characterized by a small heating, inability to fail due to overheating, maintaining the volume of container at a temperature of up to.40 degrees, durable use-from 8 to 10 years. To increase the life of performance, you need to work with elements until they are completely discharged and stored in this form. The disadvantages of the devices include toxicity due to the cadmium and low specific capacity.
  • Lithium-ion-differ in the lack of memory effect, low self-discharge, withstanding more cycles in charging and discharge. Elements are sensitive to sharp changes in temperature and voltage surges during recharging. The average service life is 3 years, no more than 24 months are stored.
  • Lithium-polymer-maintain performance at serious temperature differences, are characterized by high energy density with a small volume and weight. Negative qualities include risk of fire due to overheating or reloading. In conditions of storage, stay no more than 2 years.

Corps for independent assembly of battery for DeWALT 18/20V

Good afternoon Dear Muskovites! In this review, I will tell you how to independently assemble a battery for your wireless electrical system. Also, using such a kit, you can change the case on your original battery. So we start with the fact that the battery under its DeWALT 20V system (in Europe and Russia, this line is marked 18V and is completely compatible with the American 20V) I decided to make it independently. I decided not to buy a charger, but to use the hobby zoo available in stock. I bought the tools themselves in the form of naked “carcasses” As a result, the entrance to the system cost me much cheaper than say the purchase of a tool included with the battery and charging. But what do you ask dear readers, are the Chinese do not sell ready.Made batteries? Of course they sell them and they are full on the same Ali, but only these banks will put there another question. In the best case, there will be high.Voltage banks of small capacity. The average version of the low.Speed “laptop” and the worst is “fireplaces”. The set that I took includes the case, the main fee and the indication fee. There were no nickel plates in the kit. (True, I look now there are lots with plates, they are the same). I had a strip of nickel, so this is not a problem. A special form truth is faster and more convenient to put. The seller sent quickly from China. Parcel with a track, delivered three weeks. To the seller the only claim, for some reason, he rewound all with tape without putting it all in the package So I had to clean the glue from the plastic of the case for 10 minutes.

I used contact welding for the assembly of the battery

Welding quality and nickel plates used

If you collect a regular battery, then the assembly is fast. I installed an adversarial charge for charging/balancing. К сожалению фото процесса сборки не осталось, а лезть сейчас не хочу т.To. Installation of an additional connector and laying of the wires was not simple. So I’m sorry. All the photos of the giblets can be viewed on the seller’s page. They are quite decent quality there and are no different from what I did.

I used batteries Samsung 30Q took 3 on a garbage.80 With them we get the battery on 6ah (there is no such battery in the ruler, except that the expensive flaxwell to put) No problems when working with these banks are checked in practice.

It would be possible to use Samsung 25R 3.30 took there. We get a battery with them for 5ah

Now about the product itself. Two boards of quite decent quality and there are not many elements there and those passive. Contacts high.Quality. The quality of casting is generally beyond praise! What to honestly did not expect. It is pleased that the Chinese began to equip the sets with already knocked out nickel plates (though here we must take lots from other sellers). Which is more convenient than making a battery with an ordinary strip.

The other day I came another thought how could I do it. It is known that DeWALT has 8 contacts and all batteries are displayed on it so that you can make balancing without an external connector. But where to get the connector? I looked on the boards ads of dead charges and there are 500 rubles, but unfortunately in other cities. And then I found this: www.Banggood.COM/RU/USB-Mobile-Battle-Charger-DeWALT-10_8V-20V-SLIDE-DCB184-DCB090-P-1234819.HTML The charger himself is certainly slag and it is not worth using it for its intended purpose. (In the reviews on Ali, I read that he would plant the battery until it stops t.To. BMS is not there). But there is a connector in it and most importantly complete! Further two options: 1 We throw a USB board, solder the balancing and main connector and use it with a hobby charger. 2 We take the case for example from a computer PSU, there BP for 24V, a lowering of current adjustment and balancer and on the roof this USB charger. You can collect from ready.Made modules or even make a full fee yourself nothing complicated in principle. Given the expensive cost of the native charging, it makes sense. Yes, and balancing in the native charger while the family is a question. I hope to help the community to put an end to this issue.

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Wild predator lives on a uninhabited island. To people is indifferent. Kis-kis does not understand.

Dismantling of the screwdriver battery

Let’s start repairing the screwdriver battery. We remove the battery from the handle of the screwdriver and unscrew three screws that are located under the sticker from below.

After twisting the screws, carefully push the hooks of the latch, as in the photo. And remove the lower part of the plastic battery body.

Inside we see lithium-ion banks Chinese company Highstar Models ISR18650-1300 Li-Ion. And this means that the batteries have never changed. Because it is known that intercol is purchased by nutrition elements from this company and inserts them into almost all its batteries.

Compact “Pouch Cell” Battery Better vs Large Lithium Batteries? Powerstack vs DeWalt 2 AH vs 5 AH

Below, the photo shows the insides of the screwdriver battery in all its glory with banks in the amount of three pieces that were produced already in 2011. For five years, these batteries lasted during active operation at a construction site. So the result is very worthy. Usually die earlier, probably they were not exploited in frosts.

To replace the battery cans, you need to make it out even more. I advise you to remember the location of the contacts of the plus, minus and charging, so as not to confuse the wires during reverse assembly.

Pay attention to the voltage control board on the supply elements. Especially the stabilizers and protective diodes often fail on it. Be sure to call the suspicious radio elements on this board by a multimeter.

We check the voltage at the outlet of the battery. It turned out 4.4 volts, and it should be 3.7 x 3 = 11.1 volts normally and 10.8 volts with minimal charging batteries. In general, the banks died. You need to change them definitely.

We continue to disassemble the battery of the screwdriver intercol

This can be done in several ways. You can weave wires that go to the board.

You can also simply remove the contacts from the upper lid of the nutrition elements. The photo shows what form the curved contacts have, so you easily remove them yourself.

Under the plastic lid we see how the nutrient elements are interconnected. Them welded by spot welding. This solution is used in almost any battery of another tool. This is a reliable and sparing accumulator connection. In this case, the destructive heating of the lithium nutrition elements themselves is minimal.

Gently ripped off or bite off the metal tape to disconnect the banks from each other. From the side of the board they were also interconnected by a tape and put on glue on a cardboard gasket. This is done so as not to close anything on the board. You need not to forget to return it to the place when the battery is revealing.

New lithium-ion elements of power, in view of the lack of apparatus for point welding, we will solder well-warmed powerful soldering iron very quickly. We remember that the heating of lithium-ion batteries reduces their life and is generally explosive.

Pay special attention to the condition of the wires inside the battery. They can be broken or shabby. They need to be isolated or replaced with fresh. Since I carried out the repair of the screwdriver battery on the road in the field, I had to apply a brilliant invention of an engineering mind. I took out the island of the blue radio engineering.

When disassembling the battery of the screwdriver intercol DA-10/10.8 ER I was pleasantly surprised. A thermal attemptor was put in the budget screwdriver to control the temperature of the power elements. It turns out that when overheating of lithium cans. The protection circuit turns off the power until the temperature recovers to normal. True, the owner never managed to drive him into such a regime. We neatly rip off this thermal sensor so as not to break it. Then we will place it in the same place on new banks.

How a screwdriver works

Everything is simple enough here. The simplest screwdriver consists of a plastic case, battery (1), rotation speed regulator (2), plastic button (3), engine (4), gearbox (5) and cartridge (6).

In modern screwdrivers The gearbox with planetary transmission of the force of rotation is most often used.

What can break in a charger from a screwdriver

About what breaks in the charge of a screwdriver is known to specialists who are faced with the problem of instrumentalness of the tool. Buying a new charge for a screwdriver is irrational, so if the battery of the power tool does not gain a charge, then you need to start repairs with the search for the cause of the breakdown.

The reasons for the inoperability of the charging blocks of batteries are the following details and mechanisms:

  • Fuse. All electrical appliances that are not “in the basement” have protective elements, and one of those is a fuse. He protects the charge of the charger from overstrain, wandering currents, short circuits, etc.P. To do this, in the design of the circuit, a fuse is used, designed for the corresponding current rating, the value of which depends on the voltage of the battery. Usually its face value is 5A, and it is placed immediately after the transformer in front of the rectifier bridge. The fuse has a cylindrical design of transparent glass with steel contacts on the sides. Inside is the “hairy”, which is designed to pass the current with a limit of up to 5a (on different models, the current value may vary)
  • Rectifier or diode bridge. If the fuse is serviceable, and how to check it is described below, then we proceed to the consideration of the diode bridge. These are four diodes that are designed to straighten current from the alternating from the network to a constant, required for charging the battery. To fix the rectifier, you will need to fall out of a faulty diode or all the diodes, and replace them
  • The capacitor is a large cylindrical barrel, which very often causes the device to fail. The capacitor swells, as a result of which the fuse is out of order, and often this entails the burnout of the diode bridge
  • The high.Voltage transistor of the inverter, which very often fails on charging blocks of screwdrivers, designed for 220V

What element would not have failed, but first you need to make sure that the breakdown is precisely in the power supply itself. After all, they often sin on the power supply, although in fact it is high time to replace the battery. If you are going to repair the charging screwdriver, then you should start by checking the device for a malfunction. The instructions are described above how the check checks the block itself, so now we will find a faulty element, which is the cause of charging inoperability.

How to charge the battery correctly

When buying a new tool with a nickel-cadmium or nickel-metallogid battery before operation, the battery is completely discharged and charged three times (pumped). When using a screwdriver, the battery is not put on charging until it is completely discharged. Then the pumping is repeated periodically, as a preventive measure.

Upon reaching the full charge, Ni-MH and Ni-CD batteries disconnect from the network (the controller does this in lithium-ion). With a long break in operation, the battery is removed and stored separately from the screwdriver.

With a neat circulation, following the manufacturer’s instructions, the battery will work for a long time and will not require early replacement. And minor repairs can be done with your own hands.

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