Assembling method of 18650 lithium battery

Lithium -ion battery (Li-ion, lithium ion battery): Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they are widely used. Many digital devices use lithium-ion batteries as power supplies, even though their prices are relatively high. Said to be more expensive. Lithium-ion batteries have a high energy density, and their capacity is 1.5 to 2 times that of nickel-hydrogen batteries of the same weight, and has a very low self-discharge rate. In addition, the lithium-ion battery has almost no "memory effect" and does not contain toxic substances, which is also an important reason for its wide application. In addition, please note that the outside of the lithium battery is generally marked with English 4.2Vlithiumionbattery (lithium battery) or 4.2Vlithiumsecondarybattery (lithium secondary battery), 4.2Vlithiumionrechargeablebattery (rechargeable lithium battery), so users must see the appearance of the battery block when purchasing the battery. Prevent cadmium nickel and nickel hydride batteries from being mistaken for lithium batteries because they do not see the type of battery.

We know that the outer casing of the 18650 battery is a steel shell. There is no dedicated battery spot welder. It is difficult to solder with an electric iron. Of course, there is now a strong battery flux that can be easily soldered to the 18650 battery with an ordinary soldering iron. However, this kind of strong flux is corrosive, not only corrosive to the battery casing and the positive electrode, but also to the soldering iron tip. So, how to solder 18650 battery and battery pack without battery spot welder? Below, Sange teaches you step by step how to solder 18650 batteries and assemble them into battery packs with their own practical experience.

Goot strong flux, I believe that a lot of electric powder used it to solder the battery. It can also be used to weld stainless steel.

18650 battery pack installed into the battery pack needs to pay attention to the following points:

1. The batteries are arranged neatly, which is convenient for future maintenance. It is best to use the standard 18650 battery card tray

2, welding is good, the most common welding method in the market is spot welding using nickel welding machine. It is also possible to use an electric soldering iron with good solder joints.

3. After welding, the wiring of each group of batteries must be clearly arranged.

4, do waterproof and insulation, it is best to cut a piece of barley paper or asbestos material

5, the most important point, the internal resistance of the battery before welding, the current voltage error should not exceed 0.05V! It is necessary to add a special protection plate for lithium batteries to prevent overshoot and over discharge.

6, after welding, measure the voltage of each channel is good

7. After using the newly assembled battery pack for a period of time, it is necessary to check the voltage of the battery in groups.

This is all the materials for assembling a set of 18650 electric vehicle lithium batteries, including stainless steel battery boxes.

This is the accessory material, the wire tape heat shrink film, and a voltmeter. The voltmeter is mounted on the battery case to judge the battery level.

The baffle and the bracket for fixing the 18650 battery, one protective plate, the lithium battery must have a protective plate, otherwise the baffle and the bracket for fixing the 18650 battery are scrapped once in a single release, the protective plate is one piece, and the lithium battery must have a protective plate, otherwise it is once Let it be scrapped

The most critical is the 18650 battery, the electric car must choose the power battery

Maintenance method during charging

1. If the electric car is parked for a long time, it is necessary to check the battery's power in time. The battery's power will gradually decrease when parked. In case of battery shortage, it is necessary to charge the battery. Do not leave the battery in a state of power shortage for a long time in order to avoid counting the battery.

2, the service life of electric car battery is subject to the number of charging, the general battery is more than 300 times, the average service life is about 2 years. If you charge the battery too often, it will shorten the battery life.

3, the battery must be recharged when paying attention to the charging time, the general battery charging time is about 8 hours, must wait for eight hours and then disconnect the charging. Charging time should not be too long or too short. This will damage the battery. It is found that the charger shows that it takes a while to disconnect the power supply after the charging is completed, and then disconnected after the battery is fully saturated.

4. When using the charger to charge the battery, please pay attention to check whether the indicator light of the charger works normally. If it is time to complete the charging, the indicator of the charger does not show that the charging is completed. It should be noted that the charger is bad. If you continue to charge, the battery pack will damage the battery.

Installation and maintenance method

When the battery is placed on the electric car, pay attention to the stability of the battery. Since many batteries are heavy in a box, the impact force during driving will be very large. You can put a sponge under the battery box in advance to absorb the shock. Then, the gap between the top of the battery and the seat of the electric vehicle is padded with rubber, and there will be a rubber pad at the factory to ensure the stability of the battery to prevent the battery from being damaged during the driving.

Driving maintenance

1. When the electric car is just starting, be careful not to use the electric energy to start directly. When the load is uphill, you can start with the ankle, because the current required when starting up will be very large, and the electric energy will be used at the beginning. It damages the electrode plate of the battery. So start with an ankle to avoid damage to the battery.

2. During the driving process, the electric vehicle should be activated with excessive frequent braking. If it is not good to go or the vehicle has many sections, it can be slowed to avoid the damage caused by the high current when the brake is started.

3. If the electric vehicle is found to be on the indicator panel, the indicator light will not continue to drive. Because this indicator indicates that the battery has reached the state of under voltage, continuing to use will damage the battery and shorten the battery life, even if It can't be used in the middle of the road. Once the battery is under voltage, it should be used after charging.

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Cleaning and maintenance

Usually pay attention to the battery's outer casing to be installed firmly without gaps, and find that the dust is cleaned in time to prevent dust from entering the battery. At the same time, pay attention to the release of water, do not let water into the battery, especially in the rainy weather, this will cause the battery to discharge electricity and damage the battery.

As long as these methods are completed, I believe that your lithium battery for electric vehicles must be used for a long time.

When recharging the battery, be sure to pay attention to the charging time. Generally, the charging time of the battery is about 8 hours. Be sure to wait for eight hours and then disconnect the charging.

Pay attention to the stability of the battery when the battery is placed on the electric car.

When the electric car is just starting, be careful not to use the electric energy directly.

If the electric vehicle is found to be on the indicator panel, the indicator light will not be used again.

Usually pay attention to the battery's outer casing to be installed securely, do not have gaps, and find that the dust is cleaned up in time.