How safe is the lithium battery

There are several factors that determine the safety of the battery: 1. Use scenario; 2. Chip matching; 3. Battery specification selection; 4. Charger matching. 1. Use scenario: What product is used in what environment, such as: whether the device is a power tool or a general electronic product, because power tools or some products with motors are inductive loads and have a reverse charging function. This battery cell selection It is necessary to select batteries with matching current (power, multiplier), including the design of the protection board, to design the anti-motor back-charge function, to be used effectively; for example: for mines, gas stations, etc., it must match explosion-proof batteries and explosion-proof design protection boards , Fireproof packaging materials, short-circuit and no spark design, etc., lithium manganate cathode materials should be used to make batteries and so on. 2. Chip matching: The chips are mainly divided into chip manufacturers such as TI, Seiko, Ricoh, Taiwan, Meizhimei, Hongkang, BYD, etc., but the performance of the chip includes: withstand voltage, antistatic ability, overcharge protection voltage, overdischarge protection voltage For example, Seiko chips have 3.7V chips, 7.4V chips, and 12V chips. If the 3.7V chip cannot be used for the 7.4V chip withstand voltage value, 7.4V can be compatible with 3.7V. For example, the current over-discharge voltage of polymer batteries is ideally controlled above 2.75V, and 18650 batteries can be above 2.5V. However, if the chip has G3J/G2G and other chips, their over-discharge protection value is 3.0V. 2.5V, so it is necessary to distinguish the chips that cannot be used at will; in short, different working currents, different products, and different batteries must be matched to different chips; 3. Battery specification selection: The battery is currently a polymer battery, 18650 battery, polymer battery is more suitable for small electronic products such as 3C digital, because there are too many types of polymer batteries, and the raw materials of each mold are different, there is no way to achieve long-term processing, automatic processing, and one model can not be obtained. For long-term optimization and automatic processing, and the shell is a flexible package, it is easy to be damaged. Therefore, the most suitable category is the use of small and medium-sized battery packs and single batteries. It is not recommended to use too many combinations, and the consistency needs to be improved; 18650 currently belongs to two stages. One is high-end, imported, domestic first-line, it belongs to explosion-proof design, current insurance design, it belongs to the basic fully automated processing, the consistency is relatively high, the development time is relatively long, it is a relatively mature model, and it is currently suitable for battery packs; one is The low-end 18650 is a low-cost and cheap product. It is currently a popular choice for the low-end lighting industry and consumer products. The price is definitely the lowest model at present, but there are also some risks of fire, explosion, and malfunction. So choose the 18650 manufacturer brand. Very important. 4. Charger matching: battery fires have always occurred in the early years, and a large part of the reason is caused by the charger, because some chargers are damaged and then there is a large current and voltage surge that damages the battery chip and causes the battery Chip damage or malfunction, and then lead to battery failure, etc. There are also many cases where many manufacturers mix adapters and chargers. The charger has a constant current and constant voltage charging function, and the adapter has a constant voltage function. There is no restriction on the constant voltage function. The current is very likely to damage the battery and so on. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What is the reason for the explosion of lithium batteries