What are the benefits of cylindrical lithium batteries? Are cylindrical lithium-ion batteries safe?

Soft pack and square Lithium Battery compared, 18650 cylindrical LiFePO4 Battery, is the earliest commercialisation, the highest degree of production automation, the current cost of a kind of power Lithium Polymer Battery. The characteristics of cylindrical Lithium Batteries are as follows:

1. Good monomer consistency. Consistency of cylindrical lithium-ion batteries refers to the consistency of initial performance indicators of individual batteries used in groups, including capacitance, impedance, electrical characteristics of electrodes, temperature characteristics, decay rate, etc.

2. The mechanical characteristics of the monomer are better. Compared with the square and soft pack batteries, the closed cylinder can achieve the highest bending strength under the approximate size.

3. The technology is mature and the production cost is low, but at the same time, the space for cost optimisation has been almost exhausted.

4. The low energy of the unit and the easy control of the shape in case of accident also become the reason for its replacement.

Cylindrical and square batteries are the two main trends in the industry. The positive and negative electrodes of cylindrical lithium-ion batteries are separated by a diaphragm, which is wound to form a coil core. Typically, the positive and negative plates are welded with positive and negative tabs, respectively, and drawn through both sides. The plate is welded to the positive and negative cases. The electrolyte is injected into the can. In general, cylindrical Li-ion batteries cannot be made too large due to current density and heat dissipation limitations.

Cylindrical Li-ion battery structure design is simple, positive and negative interface is close, mature production line, low cost, good group heat dissipation, excellent safety performance. Its disadvantage is that the internal resistance is relatively high, high group requirements. Back to the 18650 cylindrical lithium-ion battery, an old battery often attacked by copycat mobile power manufacturers, which is still used in a wide range of electronic devices, such as mobile power. In fact, in high-end applications such as professional imaging equipment and laptop batteries, the 18650 has been a mainstay, and the large-scale use of Tesla electric vehicles has enhanced the image of lithium-ion batteries as being highly safe.

Benefits of cylindrical lithium-ion batteries:

First of all, it has high energy density and high average output voltage. And its self-discharge is small, we should all understand that a good battery is very durable, because the cylindrical lithium-ion battery has no memory effect, so very durable, long service life.

In addition, the cylindrical battery has many advantages, such as superior cycling performance, fast charging and discharging, high charging efficiency and high output power. It is worth mentioning that cylindrical lithium-ion batteries do not contain toxic and harmful substances, known as green batteries, so you can use them with confidence.

Compared with soft pack and square lithium-ion battery, 18650 cylindrical lithium-ion battery, is the earliest commercialisation, the highest degree of production automation, the current cost of a kind of power lithium battery. Tesla has held on for many years, basically maintaining a three-way world with soft packs and square batteries.

Since Tesla announced the 21700 for the Model 3, the cylindrical battery family has gained a star member. This article will take a look at some technical points related to cylindrical batteries. The following is not a special explanation, cylindrical battery refers specifically to 18650.