The Intrinsic Artifacts
The fun and challenge of DIY battery packs
The DIY 18650 battery pack is not only a practical skill but also a sense of accomplishment. With the widespread adoption of lithium battery technology, more and more people are looking to assemble their own battery packs, whether it's for power tools, power banks, or solar energy storage systems, even if 18650 batteries are their first choice. However, welding links during the assembly process often pose a barrier for beginners. Traditional welding methods are easy to damage the battery, but professional welding methods are usedIt can greatly improve the success rate. In this article, we will provide you with detailed tips and precautions for spot welding machines to complete battery pack production safely and efficiently.
Get ready
Before welding begins, thorough preparation is key to ensuring success. First of all, it is recommended to choose a high-quality 18650 battery and give preference to models with protective plates to avoid overcharging or over-discharging. Second, checkThese include the cleanliness of the electrodes, the stability of the power supply, and the degree of wear of the solder pins. Auxiliary tools such as nickel sheets, insulating washers, and fixtures should also be prepared in advance, and the recommended thickness is between 0.1mm and 0.2mm to ensure conductivity and weld strength. Safety protection should not be neglected, and goggles and high-temperature gloves can effectively reduce risks.
18650 battery compatible
When choosing a battery, make sure its voltage and capacity meet your needs. The common 18650 batteries in the Hong Kong market range from 2000mAh to 3500mAh, and it is recommended to use the same batch of batteries to ensure consistency. If there is dirt on the positive and negative electrodes of the battery, gently wipe it with an alcohol cotton pad.
Inspecting and Configuring Spot Welding Machines
After turning on the spot welding machine, first test whether the no-load voltage is stable. Adjust the welding current and time according to the thickness of the nickel sheet, but the initial setting is usually as follows:
- Current: 300A-500A
- Time: 3ms-5ms
If the welding needle oxidizes, it can be lightly sandbed with fine sandpaper to restore its conductivity.
Detailed Spot Welding Procedure
The welding process requires meticulous and precise use, and the specific steps are as follows:
Cutting and placing nickel sheets
Cut the nickel sheet according to the battery pack arrangement, ensuring it is long enough to connect adjacent cells. When placing the nickel sheet, make sure it completely covers the positive and negative electrodes of the battery and secure it with clamps to prevent it from shifting.
Selecting the location of the solder joint
It is recommended to solder 2-3 solder points per cell and distribute them evenly to distribute the current. Avoid placing the solder joint too close to the end of the battery to avoid damaging the housing.
Welding parameter setting
First time usingIt is recommended to start testing with low parameters and gradually adjust to the best results. Here is a reference table:
| Nickel Plate Thickness | Current (A) | Time (ms) |
|---|---|---|
| 0.1mm | 300-350 | 3-4 |
| 0.15mm | 350-450 | 4-5 |
Spot welding as a demonstration
Press the solder pin vertically against the nickel sheet and touch the start switch. If you hear a clear "pop" sound, it indicates that the welding is complete. If the sound is dull, the parameters may be insufficient or the welding pins may not be pressed.バッテリー製造機
Weld Quality Inspection
Once done, use tweezers to gently pull on the nickel sheet and test its hardness. The solder joint should have a uniform, circular indentation with no burn marks around it.
Common problems and solutions
Even experienced DIY enthusiasts may encounter issues such as:
The solder joint is not strong
The reason may be a lack of current or too short a soldering time. It is recommended to gradually increase the parameters so that each adjustment does not exceed 10%.18650リチウム電池用スポット溶接機
The battery overheats
Continuous welding can increase the battery temperature. Pause soldering for 3 seconds every 4-10 points to dissipate the battery.
welding short circuit
Accidentally touching the positive and negative poles of the battery can cause a short circuit. When doing this, make sure that the nickel sheet only touches a single electrode.
Welding needle bonding
When gluing the welding needle to the nickel sheet, do not pull it forcibly. After turning off the power, you can tap the solder pins or treat them with a specialized cleaner.
Improved spot welding skills
After mastering the basic work, you can further optimize the welding effect.
Uniform welding skills
Keep the pressure of the solder needle constant and avoid tilting. It is recommended that the soldering sequence be stretched outward from the center of the battery pack to reduce cumulative errors.
Simple welding tips
Pre-positioning the nickel sheet and securing it using magnetic clamps can significantly improve efficiency.
Aesthetic skills of solder joints
To make the shape of the solder joint more regular, choose a solder pin with a circular concave surface. After welding, wipe the surface with a soft cloth to remove any oxides.
Safety Precautions
useSafety is always a top priority.
Dangers of Battery Short Circuit
A short circuit in a lithium battery can cause a fire. The work surface should be kept dry and away from flammable materials.
Risk of burns
The instantaneous temperature of welding can reach hundreds of degrees, so be sure to wear protective gloves when working.
Welding Fume Hazards
Nickel fumes emit trace amounts of metal fumes when heated, so it is recommended to do so in a well-ventilated environment or under a mask.
Safety first, enjoy the fun of DIY
Through the introduction of this article, I believe you are rightI have a comprehensive understanding of the job. From preparation to advanced skills, every step is about success or failure, and safety. In recent years, DIY battery packs have become increasingly popular in Hong Kong, but related accidents have also been heard from time to time. Only by strictly adhering to safety standards can you truly enjoy the fun of DIY. Try it now and create your own high-efficiency battery pack!