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18650 Lithium Battery Spot Welding Battery Cap Method
Jun 07, 2018

First, 18650 battery point cap demand list:

1, laser welding equipment.

2, dumplings, medical scissors and other appliances.

3, masks, rubber gloves, disposable plastic gloves and other labor insurance supplies.

4, after the injection of 18650 battery, battery cap

Second, 18650 battery cap production steps:

1, wearing good labor supplies, temperature and humidity requirements, temperature: 15 ~ 26 °C, glove box dew point temperature ≤ -35 °C, sealing room ≤ -30 °C;

2. Check whether the electrolyte of the battery has completely finished after the injection of the liquid. The quality of the electrolyte is not completely completed and the quality is confirmed by the quality personnel to return to the previous process.

3, adjust the laser welding machine for spot welding mode, and set the spot welding current, pulse width and other parameters. Spot welding: Place the cap in the cap mold of the laser spot welder. Use a tweezers to straighten the battery after the injection. Place it in the laser spot welder mold. Place the needle near the pinhole (bipolar ear battery) The pinhole is located below the tab and the pinhole of the monopole ear battery is located on the tab). The cap is pressed onto the cap so that the tab is perpendicular to the centerline of the two vent holes of the cap. The tab edge is flush with the edge of the aluminum plate and the laser is turned on. Automatic welding button, laser welding machine automatically near the edge of the ear 1-2mm spot welding 3-4 points, followed by analogy to the other positive electrode ear welded to the cap.




4. After the battery is welded, the aluminum lug is folded into a “V” shape, and then the hand is pressed into the step of the roller groove of the battery. After the cap is pressed, it is neatly placed in the material box and transferred to the sealing process. After the work is completed, turn off the power of the laser welding machine, clean and clean the site, use the 18650 battery for matching, use the lithium battery PACK design to make a 11.1V lithium battery pack and use it in various related electronic digital products. Above, if the battery cap is not spot welded well, it cannot be used to make the battery pack.

Third, 18650 battery point cap operation requirements:

1. Check the temperature and humidity control record form to confirm that the temperature and humidity have reached the process requirements.

2. Before the class starts every day, the production squad leader and the IPQC must confirm that the qualified welding is qualified and can be produced normally after signing.

3, before the battery spot welding requires the electrolyte inside the battery must be completed (the battery level does not flow out);

4, spot welding should be solid, no welding, spot welding after the positive ears can not appear significant fried pits, explosion phenomenon;

5. The solder joints on each positive electrode ear should be guaranteed at 3-4 points, and the tensile strength after welding should be >0.5 Kg.

6. The edge of the positive electrode ear after spot welding must not exceed the edge of the cap sealing ring;

7. Before the battery is pressed on the cap, it is found that the insulating sheet is exposed, and the exposed part must be cut with scissors. The aluminum tab must not touch the inner wall of the battery case after pressing the cap; the cap edge must not be higher than the edge of the battery case after the battery presses the cap. .

Fourth, 18650 battery point cap note:

1, pay attention to safety during the spot welding process.

2, because the workshop temperature and humidity can not reach the process requirements or other special circumstances to stop sealing, sealing, spot welding capped battery, short suspended electricity with plastic wrap, a long time into the vacuum box ≤ -0.08MPaMpa conditions , Storage time ≤ 2h, production conditions meet the process requirements, can be individually identified, according to the normal process operation (filling fluid is not enough, unsealed sealing); balance time> 2h, confirmed by the technical staff to give advice after treatment.

3, can not restart the laser welding machine. Explosion phenomenon;

4. The welding spot of each positive electrode ear is guaranteed at 3-4 points, after welding, it is subjected to tensile force> 0.5Kg;

5. The edge of the positive electrode ear after spot welding must not exceed the edge of the cap sealing ring;

6. Before the battery is pressed on the cap, it is found that there is an exposed phenomenon on the insulating sheet. Use scissors to cut out the exposed part. After pressing the cap, the aluminum tab must not touch the inner wall of the battery case.

7, no spot welding 18650 lithium battery cap can not be used for PACK battery pack design and production, and a good quality 18650 lithium battery can be made into a variety of industrial lithium battery pack.

8. After the battery presses the cap, the edge of the cap must not be higher than the edge of the battery case.

             Electric Bike Batterys

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