Analysis of power battery manufacturers, how to break the life limit of lithium batteries for electric bicycles

As we all know, although lithium batteries have a longer life cycle than lead-acid batteries, high cost and risk are always a problem in the industry. Why do all power lithium batteries have almost the same result? Is there any way to overcome these technical problems? The answer is: there must be some~ how to achieve it. Many people may not know that a set of 48V ternary lithium battery packs on the market consists of at least 13 18650 lithium batteries or other models. After connecting in series, the voltages of all the batteries are assembled to achieve the desired output voltage. If the capacity needs to be expanded, we only need to combine a 13-cell lithium battery combination, or more combinations to achieve the capacity Expansion. Theoretically speaking, it is very simple, and there is no barrier to production. Anyone with basic knowledge can operate it. Therefore, there are many individual studios on the market to help make some ultra-high capacity or special customized battery products, but it is difficult to achieve the quality of batch products and the cycle life to a high level. , Depending on the quality of the single lithium battery cell used, the consistency of the internal resistance, and the reliability of the protection board, plus the high standards of the manufacturing process, the above must be a brief description of the consistency, the consistency means two , Or the capacity of two or more lithium batteries, the internal resistance is infinitely close or completely the same, it is called the so-called consistency, such as the internal resistance of A cell: 20Ω capacity 1000mAh, B cell internal resistance: 20Ω capacity 1000mAh. Then it shows that the consistency of the two batteries is 100%, but in actual situations, this is almost impossible, why can’t it be achieved, because the electrolyte in each lithium battery cell is corrosive to the current collector, in order to avoid There are many complicated processes for the self-damage of lithium batteries, but the final result is that these conditions are never constant, and there are large variables, so consistency is a very big problem. Because of the individual difference of the single cell, the loss will be different during the later use of the lithium battery, the pressure difference (actual voltage) will be larger and larger, and the difference in internal resistance and capacity will pass through each charge and discharge. The battery causes damage from overcharge or overdischarge (Note: the smaller the internal resistance, the faster the charge). When the overcharge and overdischarge reach the limit of the cell, the cell fails. Eventually lead to the failure of the entire battery pack. Therefore, a very common technology is applied to the BMS control board to realize the passive balance of the protection board to the battery through the single string voltage limiting method. This is also a very common technology currently used. It is also the cheapest way. However, the limitations of this technology are very large. It cannot repair the battery with the existing pressure difference. Although it can be realized in theory, the author's test result is that this technology cannot repair the battery with the existing pressure difference. From the above conclusions, to extend the service life of lithium batteries, a breakthrough in charge management technology is required. There is a high-cost active lithium battery equalization technology that can repair a single string with a pressure difference every time it is charged. The electronic CH-RLi031-01 charger has active equalization charging, which can completely repair the unbalanced lithium battery problem caused by any state, but it is currently only suitable for charging small lithium batteries of 1-4S. In fact, many companies are developing this technology in the lithium battery pack business, but it is still difficult to achieve it because of the pain and the high cost and the lack of reliable chips for technical support. But in the future, this technology will certainly be widely used. Many years ago, Tesla publicly stated that it had made new breakthroughs in charging and discharging management technology, which attracted many domestic netizens to attack. Most people think that the core of lithium batteries is the technology of lithium batteries. On the contrary, the technology of lithium batteries is only a relatively small part of the entire lithium battery process. Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous one: a highly toxic material, As long as it is sprayed on any object, any object can be turned into a battery.