18650 Cell Manufacturer

There are a lot of 18650 battery factories in mainland China now, and the quality is uneven, some good and some bad. Today’s 18650 battery factory page mainly introduces the basic characteristics of 18650 batteries, the working principle and production process of 18650 batteries, the current top 10 mainstream battery factories, and LG, Samsung and other brand battery specifications.
If you have customized needs for 18650 lithium-ion battery packs, we will provide the best solution according to your requirements.

18650 cell

18650 Cell Description

18650 is the originator of lithium-ion batteries – a standard lithium-ion battery model set by Japan’s SONY company in order to save costs, where 18 indicates a diameter of 18mm, 65 indicates a length of 65mm, and 0 indicates a cylindrical battery. Strictly speaking, it is called 18650 lithium battery, and it is called lithium battery or lithium battery pack with the protection board (BMS).

18650 Battery Characteristic

The voltage of the 18650 lithium battery is marked as 3.7V or 4.2V, but the voltage is actually the same. 3.7V is the rated voltage of the cell, and 4.2V is the voltage when the cell is fully charged. The common mainstream capacity in the market is 1800mAh-3300mAh, and there are even 3300 or 4000mAh. Except for the 3500mAh that has been mass-produced by LG, the current technology of other battery manufacturers is not stable, so it is not recommended to buy.

The discharge threshold of 18650 cells is generally 3.2V, and there are also 2.8V. Most lithium batteries cannot be discharged with a no-load voltage below 3.2V, otherwise excessive discharge will damage the battery. 4.2V is the highest limit voltage for battery charging. It is generally believed that charging the no-load voltage of the lithium battery to 4.2V is considered to be fully charged. During the battery charging process, the battery voltage gradually rises from 3.7V to 4.2V, and the lithium battery cannot be charged. Charge the no-load voltage above 4.2V, otherwise it will damage the battery, which is the special place of lithium battery.

The theoretical cycle times of 18650 cells can reach about 1000 times! Due to the high density, the cells are used in notebook batteries (notebook manufacturers have gradually ignored the 18650 cells and switched to polymer lithium cells with larger capacity and smaller volume in order to pursue thickness), power banks (unfortunately, they are composed of 18650 cells). The thickness of the power bank is not less than 18MM, and the power bank that does not use polymer as the cell is small and gradually uses polymer cells), power tools, massage sticks, fascia guns, hand-held small fans, flashlights, LED lights, etc. on the device.

high temperature formation

Every time we talk to customers about the number of cycles, we will emphasize to the customers to pay attention to the conditions of use: in theory, at 23±2°C, the battery is fully charged with a current of 0.5C; and then left for 10 minutes, the battery Discharge with 0.5C current to the cut-off voltage, or 0.01C current, and finally let stand for 10 minutes. The above 4 steps, we call it a cycle. At present, the definitions of the major 18650 battery factory specifications are slightly different, and there are two types defined as 300 cycles and 500 cycles. At that time, in the actual selection, we will choose the most suitable battery cell as much as possible according to our industry experience and customer’s application field.

The working principle of 18650 lithium battery

Lithium-ion batteries are mainly composed of a positive electrode, a negative electrode, a separator and an electrolyte, and rely on Li+ to move between the positive electrode and the negative electrode to work. During charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging. Taking lithium cobalt oxide as the positive electrode and graphite as the negative electrode as an example, the chemical reaction formula during charging is as follows:

Lithium-ion battery structure

Lithium-ion batteries are mainly composed of four main materials: positive electrode, negative electrode, diaphragm and electrolyte. At the same time, a complete 18650 cylindrical lithium-ion battery also includes auxiliary materials such as positive and negative leads, upper and lower insulating sheets, cover plates and outer steel shells. Its structure is shown in Figure 1.

18650 cell inside image

Lithium-ion battery manufacturing process and control points

The manufacturing process of lithium-ion batteries is complex and there are many procedures. Errors in any link will affect the performance of lithium-ion batteries or bring about safety problems. Therefore, only by strictly controlling each manufacturing process can we manufacture products with excellent performance and safety. qualified cells. Taking the 18650 cylindrical lithium-ion battery as an example, the paper introduces the manufacturing process of the battery in detail, and explains the control points and influences of each manufacturing process. elaboration, as shown in Figure 2.

battery manufacturing process

In the entire manufacturing process, this requires strict SOP and inspection specification process implementation to achieve high-efficiency and high-quality batteries. Of course, there is another very important factor, which is the ratio of design materials developed. This determines battery capacity, charge-discharge performance, and stability.

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The top 10 18650 battery factories

  1. Japan’s Sanyo 18650 lithium battery, the performance is recognized as the best, ranking first, and the price is also ranked first, and now the commonly used capacity is 2000-2600mAh.

  2. Japan’s Sony 18650 lithium battery is also a good battery. The battery has excellent consistent performance and is suitable for making battery packs. It ranks second. The common capacity is 2000-2600mAh.

  3. Japan’s Panasonic 18650 lithium battery is as famous as Sony. Its common capacity is also 2000-2600. Panasonic can now buy a maximum capacity of 3000, but the price is too expensive.

  4. South Korea Samsung 18650 lithium battery, enough capacity, very good battery, very suitable for flashlight use, commonly used capacity is 2000-2600 Samsung 2600mAh.

  5. South Korea LG18650 lithium battery, basically the same as Samsung, very good, commonly used capacity is 2000-2600mAh.

  6. Lishen LISHEN-18650 lithium battery brand, the company is located in Huayuan Industrial Zone, Binhai High-tech Zone, Tianjin, covering an area of 400,000 square meters. It was established on December 25, 1997 with a registered capital of 1.25 billion yuan and total assets of 600 billion yuan. Product applications have also expanded from portable mobile electronic devices to new energy electric vehicles, wind and solar power generation, energy storage systems and many other fields.
  7. Founded in 1995, BYD currently employs about 220,000 people, covers an area of nearly 18 million square meters, and has established 30 production bases around the world.

  8. 18650 lithium battery brand: EVE, founded in 2001, has been listed on Shenzhen GEM since 2009. At present, the company covers an area of about 500,000 square meters. It has 4 production bases in Huizhou, Guangdong and Jingmen, Hubei. There are branches and offices in Hong Kong, Taiwan, the United States, Europe and other places at home and abroad.

  9. 18650 lithium battery brand: BAK, BAK Battery Co., Ltd. was established in 2001 with a registered capital of 660 million yuan or 82.6 million US dollars. It was listed on NASDAQ in the United States on May 31, 2010. It is a listed company in the United States . It is a high-tech enterprise integrating R&D, production and sales of lithium-ion batteries. The newly built BAK Industrial Park covers an area of 360,000 square meters and has more than 8,000 registered employees. The daily output of lithium-ion batteries reaches 1.5 million, which is the largest in the world. One of the professional manufacturers of lithium batteries.

  10. 18650 lithium battery brand: AVIC Lithium Battery, AVIC Lithium Battery (Luoyang) Co., Ltd. is a joint investment and establishment of AVIC Group Corporation and its affiliated units, and is a holding company of Chengfei Group. Lithium-ion power battery is an automotive power and electric energy storage product that conforms to the national theme of energy conservation and environmental protection, leads the market consumption boom, has mature technology, and has good market growth expectations in the future. It has green environmental protection, high voltage, high energy density, rapid charge and discharge, and long life. , high reliability, production and use of environmental pollution-free and other excellent characteristics. As the most promising green secondary battery in modern times, lithium-ion power battery has a very broad application space in the development of new energy vehicles, and can also be widely used in submarines, torpedoes, armored vehicles, military radars, unmanned aerial vehicles, satellites and other military industries In the field, electric vehicles, city buses, electric forklifts, solar storage batteries, power UPS and other civil fields. After several years of exploration and development, AVIC Lithium has established a first-class scientific research, production and marketing team.

18650 brand cell specification

The following are some cell specifications of LG, Samsung, BAK, please contact me for more parameters of the model.

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

Contact us for 18650 battery customization

HlcBattery, 8-year lithium battery manufacturer, customized 18650 battery pack, energy storage/power lithium battery, more than 10 R&D teams, 100+ enterprise customization, special equipment, medical equipment, security communication, instrumentation 18650 battery pack Manufacturer. The main feature of the product is safety and reliability. When the battery samples are confirmed, we can provide various certifications, including UN38.3, KC, CB, PSE, CE, etc. Welcome to consult our customized 18650 lithium-ion battery pack.

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