Lithium Battery Knowledge
Lithium-ion batteries have been commercialized since the 1990s. Nowadays, they have entered the daily life of ordinary people. We use mobile phones, tablets, smart watches, VR glasses, digital cameras and other portable electronic products, almost all use lithium-ion batteries.
The lithium-ion battery protection board current is determined by the detection voltage of the protection IC and the internal resistance of the MOS tube. If the protection IC cannot be changed, you can change the MOS tube, such as DW01 and 8205MOS, using a MOS tube is 2 ~ 5A, using two The MOS tube parallel current will double. At present, some large-capacity mobile power supplies use 3 to 4 MOS tubes in parallel.
How many model names does the lithium battery have? In fact, it's not clear at this time, because each battery manufacturer has its own model specifications and some custom battery models. The following introduces the name of the lithium-ion battery model and the meaning of the letters and numbers on the battery, so that everyone can better understand the battery model specifications.
At present, most of electronic products use lithium-ion batteries, and a few years ago, electronic products mostly used nickel-cadmium batteries. These two batteries have different memory effects. The so-called memory effect means that during the first few charges, if it stops before being fully charged, the battery will remember the previously charged capacity when charging in the future.
Lithium-ion batteries are chemical batteries that use lithium as the negative electrode active material. The standard electrode potential of lithium is the most negative, the lightest in the metal, and the most reactive, so the lithium-ion battery has a high electromotive force and specific energy, which is an important high-energy battery.
Batteries can reach the desired operating voltage when there is a connection of several cells in series; Each of the cells will add its voltage potential to obtain the total voltage required across the terminals. On the other hand, the parallel connection brings about a higher capacity by simply adding the total amp-hour (Ah) of all cells involved.
Inconsistent lithium battery packs mainly refer to inconsistent parameters of capacity, internal resistance, and open circuit voltage.
performance of lithium battery packs
Inconsistent performance of the cells is formed during the production process. The batteries in the same lithium battery pack are weak and weak, and the acceleration is weak. The degree of dispersion of the parameters between the individual cells increases as the degree of aging increases. Inconsistent battery strings are used together and the following problems occur.
UL is an independent product safety certification organization which, in conjunction with other organizations and industry experts, publishes consensus-based safety standards. For lithium batteries, key standards are: UL 1642 (Lithium Batteries) – This standard is used for testing lithium cells. UL2054 (Household and Commercial Batteries) – For lithium batteries, Battery packs tests are covered by UL 2054.
The CB Scheme is an international program for exchange and acceptance of product safety test results among participating laboratories and certification organizations around the world. The CB Scheme offers manufacturers a simplified way of obtaining multiple national safety certifications for their products.
IEC 62133-2:2017 is the most well-known standard for exporting lithium-ion battery, including those used in IT Equipment, GPS, wearable products, smartwatch, Bluetooth devices, wireless sensors, tools, laboratory, household and medical equipment.