Talking about the duality of lithium-ion batteries

As the power source of wearable products, lithium-ion batteries are used as the power source of wearable products. The selection and charging and discharging circuit planning must meet the requirements of productization, EMC, EMI and other certification technical standards, as well as technology, process, quality, cost, etc. In terms of advantages, this makes the selection of lithium-ion batteries seem to have a certain meaning. The batteries used in wearable products today are usually lithium-ion batteries. Lithium-ion polymer batteries use lithium oxide as the positive electrode and metal lithium as the negative electrode. The power supply voltage is about 3.7v, which replaces the traditional lithium-ion battery. It has the advantages of not replacing wearable products. First, the output voltage is 3V~4.2v; second, the operating temperature planning width is -20℃~60℃, and the charging temperature planning is 0℃~50℃; thirdly, it has a long service life and cycle. The lifespan can reach more than 500 times, even 1000 times, and lithium iron phosphate can reach more than 2000 times; and the self-discharge rate is low, stored at room temperature, the electric Li-ion storage self-discharge rate is about 5-10% after one month, And there is no battery memory effect (more than ten years ago, mobile phone lithium-ion batteries had to be charged three times, three discharges and overflow phenomena constituted an obvious comparison, and the technology that we lamented did not carefully reveal my age); after all, lithium-ion batteries are already Won the reputation of environmental protection, because they do no harm to the environment, and they can be made into various shapes, which to some extent supports the popularity of consumer electronics products today. Compared with other types of rechargeable batteries, current lithium-ion batteries are compared in all aspects: In addition to the addition of lithium polymer batteries to prevent overcharging, discharge, and overload, the maintenance of the internal circuit adds ventilation, which appears in the drawing line. The outer shell is thinner than the shell thickness or holes. When the battery is short-circuited, the battery will attack many sensitive gases and new pressure in a short period of time. When the pressure is overloaded, the thin shell will be vented in other places, and the natural gas will be Encourage venting, in order to prevent the internal pressure of the battery from being too high, it is necessary to prevent the risk of the battery from bursting. The membrane inside the polymer lithium ion battery has high durability and prevents internal short circuits. When the internal temperature of the battery is too high to prevent the battery from bursting, the separator will also dissolve. When the internal temperature of the battery reaches above 130℃, the diaphragm of the mesh will be closed to prevent lithium ions, high resistance (2k), and the internal temperature of the battery will continue to rise, then the battery will be maintained. Once activated, the vent and diaphragm permanently disable the battery. Under normal circumstances, the lithium-ion batteries supplied by suppliers have battery maintenance circuits, which can end the maintenance of lithium-ion batteries such as overcharge, overdischarge, and overload. The chip supports USB and external adapters. If the interface is converted to a universal USB interface and the differential circuit is programmed, both forms of charging processing can be completed through one interface, such as a MOSFET or an electronic switch. These two parts are indispensable for wearable products to pass some kind of certification. Doing them well is the top priority. This generally does not appear in the regular products of consumer electronic products. Regarding DIY users, two points should be paid special attention to. Don't regret it in order to save a little cost. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Revealing the three truths about mobile phone batteries