LITHIUM CELLS: DIFFERENCES, USES AND HOW TO CHOOSE THE BEST ONES

The negative aspects of cylindrical lithium ion cells include the low capacity of individual cells, reaching a maximum of 3Ah, and the fact that the cells are assembled in series and parallel using welding.
This type of construction does not allow the replacement of individual cells, but requires the replacement of the entire module using more invasive and costly procedures. If your equipment has a battery problem, the entire module needs to be replaced, resulting in costly downtime.
In addition, the low capacity of the individual elements and the resulting “parallel” nature of many elements often result in a decrease in safety of the entire lithium battery pack.

For example

Most lithium ion battery assemblers put a number of cells in parallel to achieve the desired capacity: for example, to achieve a 200Ah capacity using 2.5Ah cells, 80 cells must be arranged in parallel, will all these cells connected in parallel.
If, due to an internal problem, one of these short-circuits, it will not only absorb its own energy but must also dissipate all the energy of the 80 cylindrical cells in parallel. This could result in very high heat in the module, with disastrous effects such as fire.
To avoid this, major manufacturers such as Tesla use highly sophisticated production processes which enable the cells to be connected in parallel using a type of fuse. If a cell shorts, the “fuse” blows and the safety of the battery pack is not compromised.

Unfortunately, none of the lithium ion battery manufacturers in the industrial market has this type of technology. As a result of these negative aspects, we avoid this type of cell in Flash Battery.

The most negative aspect is certainly the fragility of the casing, which doesn’t take much to break; even a fingernail can damage it irreparably.
When using this type of cell, the cell packaging system is very important. This must prevent any kind of stress on the individual cells: vibrations, squashing and warping.

The cell packaging system for the creation of modules is very important, and therefore it is complicated, if not impossible, to develop custom modules.

The cells always have medium-low capacity.

To create industrial battery packs, it would take dozens of cells in parallel, thus lowering the safety of the battery pack. Again in this case, the individual cells are welded to connect them in series or parallel, and it is therefore impossible to replace a cell, and necessary to replace the whole module.