Method for spot welding cylindrical lithium battery caps

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Method for spot welding cap of cylindrical lithium battery

The method of cylindrical lithium battery spot welding cap is very simple. The process includes the requirements list of cylindrical lithium battery spot welding cap, manufacturing steps of cylindrical lithium battery spot welding cap, operation requirements of cylindrical lithium battery spot welding cap, matters needing attention of cylindrical lithium battery spot welding cap, etc. Good 18650 lithium battery can produce various lithium battery packs by pack battery technology.

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I. list of requirements for cylinder lithium battery point cap:

1, laser welding equipment.

2. Tweezers, medical scissors and other instruments.

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

4. 18650 battery and battery cap after liquid injection

Ii. Steps for making 18650 battery point cap:

1, good wear labor insurance supplies, temperature and humidity, temperature: 15 ~ 26 ℃, glove box - 35 ℃ or less and dew point temperature sealing room - 30 ℃ or less;

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2. Check whether the battery electrolyte is completely discharged after liquid injection. If the electrolyte is not discharged completely, it shall be returned to the previous procedure after confirmation by the quality personnel.

3, battery network found must first adjust the laser welding machine for spot welding mode, and set the spot welding current, pulse width and other parameters. Spot welding: first put the blocks in the laser spot welder cap mould, injection liquid after the battery with a pair of tweezers ears straight, in a laser spot welding mold, rolled the near the pinhole is very ear ear cell volume (bipolar pinhole located just below the pole ear, unipolar ear cell volume pinhole in extremely above the ear) pressure on the blocks, making very ear is perpendicular to the center line of the two vent blocks, and ear edge and aluminum plate edge level, open the laser welding machine automatic button, automatic laser welding machine in near the pole ear edge of 1-2 mm spot welding 3-4 PM, so on spot weld the positive ear of the other to the blocks.

4. After the battery spot welding, fold the aluminum pole lug into a "V" shape, and then press the cap into the battery groove step by hand. After the completion of the work, shut off the power supply of the laser welding machine, clean and clean the site, and conduct the corresponding assembly with 18650 cells. After the battery PACK design, it can be made into 11.1v lithium battery PACK and can be used in various related electronic and digital products. If the battery cover is not spot welded, it cannot be used to make the battery PACK.

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Iii. Operation requirements for cylinder lithium battery point cap:

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

2. Before the start of each shift, the production monitor and IPQC shall confirm the qualification, weld the qualified products and sign the contract before normal production;

3. Before battery spot welding, it is required that the electrolyte in the battery must be lowered (the battery shall be placed horizontally without any discharge);

4, spot welding should be firm, no virtual welding, after spot welding positive ears shall not appear obvious blasting pit, blasting through phenomenon;

5. Original battery of 18650 the author suggests that the solder joints on each positive electrode ear should be guaranteed at 3-4 points and withstand tensile force of > 0.5kg after soldering;

6. After spot welding, the edge of positive lug shall not exceed the edge of sealing ring of cap;

7. If the insulating piece is exposed before the battery cap, cut off the exposed part with scissors. After the cap, the aluminum ear shall not touch the inner wall of the battery shell. After pressing the battery cap, the edge of the cap shall not be higher than the edge of the battery housing.

Iv. Matters needing attention:

1. Pay attention to safety during spot welding.

2, because the workshop temperature and humidity can not meet the technical requirements, or other special circumstances to stop sealing, are sealing, spot welding blocks of battery, short outage sealing surface with plastic wrap, long into the chamber evacuation - 0.08 or less MPaMpa under the condition of the balance, save time 2 h, or less after the production conditions of process requirement, can separate identity, according to normal process operation (liquid injection rate not enough rehydration, not sealing to seal); The balance time is > 2h, and the technician will give the treatment advice after confirmation.

3, can not be turned on the case of cleaning the laser welding machine. Burst phenomenon;

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4. The solder joints on each positive lug shall be at 3-4 points and withstand tensile force of > 0.5kg after welding;

5. After spot welding, the edge of positive lug shall not exceed the edge of sealing ring of cap;

6. If the insulating piece is exposed before the battery cap, cut off the exposed part with scissors. After the cap, the aluminum ear shall not touch the inner wall of the battery shell.

7, not spot welding 1 cylinder lithium battery cover ten million can not be used for PACK battery PACK design, and ordinary

8. After pressing the battery cap, the cap edge shall not be higher than the battery shell edge.

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