18650 Battery Manufacturers

Shenzhen HLC Battery Technology Co., Ltd. was established in 2002. It is a company that provides ultra-reliable and ultra-safe 18650 lithium battery system customized solutions and products for global users.

For 8 years, we have been focusing on lithium battery customization. Because of focus, so professional.
The company has completed 500+ successful cases and delivered more than 10 million sets of lithium battery modules. HLC believes that it will definitely bring you “super reliable and super safe” quality services.

18650 Battery Pack

18650 battery pack design

The biggest feature of the 18650 lithium-ion battery pack is its flexible combination. Most of the continuous orders can be completed semi-automatically. It is conceivable to understand the 18650 lithium-ion battery pack process is now more and more simple.

The general 18650 lithium-ion battery PACK includes: 18650 cells, battery protection board, connecting nickel sheets, lead-out nickel sheets, green paper accessories, insulating paper, wires or plug wires, PVC outer packaging or shell, output (including connection device), key switch, power indicator, and auxiliary materials such as EVA, highland barley paper, and plastic brackets together form a PACK, and most 18650 battery packs are of the same type.

How to make a 18650 battery pack

High quality comes from high standards, without letting go of any details

Cell selection

Use imported high-quality batteries

PCBA & Housing

The choice is Japan Seiko IC

Incoming inspect

To ensure that the material is qualified before production

Semi-finished product process and test

Spot welding of cells

Finished product assembly and test

Combining battery packs with PBCA

Finished product full inspect & aging

Charge and discharge tests on finished products

Finished product test and package

for aged finished products

Finished product storage OQC

Inventory after re-inspection

18650 Battery Applications

Energy storage system

Power system

Digital consumer electronics

custom 18650 battery pack applicant

How to usb charge 18650 battery pack

Lithium battery with PCM

If the lithium battery has a protective plate, it can be charged directly with a USB cable. The function of the lithium battery protection board is to prevent the lithium battery from being overcharged and overdischarged. When the battery voltage reaches 4.2V, the protection board will cut off the current input.

Lithium battery without PCM

If the lithium battery does not have a protective plate, it cannot be directly charged with a USB cable. The charge cut-off voltage of the lithium battery is 4.2V. That is to say, when the internal voltage of the battery rises to 4.2V, the charging should be stopped, otherwise the lithium battery cells will be damaged. The voltage output through the USB cable is generally 5V, which is higher than the cut-off voltage of the lithium battery. Therefore, if the battery does not have a protective plate, it will cause the battery to be overcharged.

Why do 18650 batteries explode?

  • Internal short circuit: Structural or workmanship defects lead to tab insertion, too little diaphragm wrapping, burrs, diaphragm discount, etc.
  • External short circuit: The explosion after combustion caused by the external short circuit of the lithium battery below 1AH is rare. Usually, it is bulging or the tab is simply blown. The personal analysis is the combustion caused by the external short circuit of the power battery or the large-capacity mobile phone battery.
  • Overcharge explosion: This is the most dangerous and most feared by enterprises, but it still occurs occasionally. From what I know, there are two points: the user does not use the matching charger as required, thereby destroying the protection circuit, and the user often charges for an unlimited time, which is difficult without frying; the 18650 lithium battery is unreasonable. And the protective plate fails, and in this case, it will also explode in a mess. Same goes for a single battery.
battery expansion

What should be paid attention to when 18650 lithium ion battery pack process is assembled

  • Set the cell internal resistance, voltage and self-discharge.
  • Set the channel and level.
  • Set the number of groups for each channel.
  • If there is any defect, it should be isolated and analyzed in time.

Multi-parallel multi-series 18650 lithium-ion battery pack design skills

  • Adopt the principle of priority and easy operation, that is, easy operation by employees.
  • The principle of priority operation safety is adopted, that is, employees are not easy to short-circuit or have better preventive measures when operating.
  • The principle of equipment is adopted, that is, what is done with the aid of auxiliary equipment is as far as possible without manual labor, at least semi-automatic.
  • The packaging design should be reasonable, easy to take and put away, and the product should not be delivered to the customer for a long time.

What should be paid attention to when welding 18650 lithium-ion battery pack process

  • Attention should be paid to the current of spot welding when welding 18650 lithium-ion batteries.
  • When welding 18650 batteries, pay attention to the diameter of the solder pins.
  • When welding 18650 lithium-ion batteries, pay attention to the spacing of the solder pins.
  • It should pay attention to the number of solder joints.
  • When spot welding, no explosion, no short circuit, and no virtual welding are allowed.
automatic sorting machines
18650 battery sorting
our workers

Chemical Test

Automatic Welding

Final Testing

  • Cell Formation & Grading
  • Temp & Hum Controller
  • Short-circuit Test
  • Salt Spray Test
  • Molding System
  • Automatic Welding
  • Automatic Welding
  • Final Test
  • Packing

Need Any Custom 18650 Lithium-ion Battery Pack?

18650 Cell Model List

BAK 18650 3050mAh 6.1A Battery

BAK 18650 3350mAh 6.5A Battery

BAK 18650 2500mAh 20A Battery

LG HG2 18650 3000mAh 20A Battery

LG 18650 HD2 2000mAh 25A Battery

LG Chem 18650 HE2 2500mAh Battery

Samsung ICR18650-26J 2600mAh Battery

Samsung INR18650-25R 2500mAh Battery

Samsung INR18650-20S 2000mAh Battery

Product & Factory Certificates

  • All batteries are require related certification apart from lab testing, such as voltage, current measure, and each countries have different certificate demand.
  • Clients are welcome to have any 3rd party certification company verify our batteries or the factory documents.
  • We have been working with UL, TUV, SGS certication lab. All batteries approved by UL1642, UN38.3, IEC62133, PSE, KC, CB, MSDS certificate or report.
battery certificate

Contact us for 18650 battery pack solution

FAQ of 18650 li-ion battery pack

  • Lithium-ion battery storage temperature

    The battery should be stored at room temperature, and charged to 40%~60% electric quantity.

  • How long does a 2.5Ah battery last?
    It can last 5~6 hours based on a 0.2C discharge rate. It can last 1~2 hours based on the 1C discharge rate.
  • How long to get samples?
    Generally, 7 days lead time for small quantity samples.

Ask For A Quick Quote

We will contact you within 1 working day, please pay attention to the email with the suffix “@hlcbattery.com”