Introduce the achievements and reasons of the power lithium-ion battery protection board

Power lithium-ion battery protection board The power lithium-ion battery protection board is a necessary equipment to enhance the safety of the power lithium-ion battery. In most environments, the lithium battery protection board should have the results of restraining the operating conditions of the lithium-ion battery, including voltage, current, temperature, and so on. Due to the extraordinary use of lithium-ion batteries, the power lithium-ion battery must be used together with the protective plate to ensure the safety and reliability of the entire system. Power lithium-ion battery protection board achievement ⒈Overcharge voltage protection: prevent the charging voltage from being higher than the upper limit of the lithium-ion battery voltage, causing battery failure, causing security disturbances; ⒉over-discharging voltage protection: preventing the power lithium-ion battery from being deeply discharged, preventing battery life Or cause peace and chaos. ⒊Over-current protection: limit the amount of current passing through the protection board and battery; ⒋ short-circuit protection: prevent the power lithium-ion battery from short-circuiting and cause security disorder; ⒌temperature control switch: protect the lithium-ion battery pack and the protection board from overheating Causes safety hazards. The reason why lithium ion battery (rechargeable type) needs to be protected is determined by its own characteristics. Since the lithium-ion battery's own materials have chosen that it cannot be overcharged, overdischarged, overcurrent, short circuited, and ultra-high temperature charging and discharging, the lithium battery components will always be presented with an exquisite protection board and a current fuse. The care results of power lithium-ion batteries are usually completed by the cooperation of the care circuit board and the current devices such as PTC. The care board is composed of electronic circuits, and accurately monitors the voltage and charge and discharge of the battery cell at -40°C to +85°C. The current of the loop can control the on and off of the current loop in real time; PTC can prevent severe damage to the battery under high temperature conditions. The purpose of the power lithium-ion battery protection board is to protect the battery, prevent overcharge, overdischarge and high current damage to the battery, and to balance the battery voltage when the battery is fully charged. In order to protect the life of the lithium-ion battery pack, the battery charging voltage should not be higher than 3.6v at any time, that is, the protection voltage of the lithium-ion battery protection board is not higher than 3.6v, the balance voltage is 3.4v-3.5v, and the battery discharge protection voltage is generally 2.5 Above v is fine. The lithium-ion battery protection board is a protection for the charging and discharging of the series-connected lithium-ion battery pack; when the battery is fully charged, it can ensure that the voltage difference between the single cells is less than the set value (generally ±20mV), and realize the battery packs The equalization of charging effectively improves the charging results under the series charging method; at the same time, it detects the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single battery in the battery pack, and protects and delays the battery life; undervoltage Take care to prevent battery damage due to over-discharge when each single battery is discharged. The power lithium-ion battery protection board has different circuits and parameters according to the difference of IC, voltage, etc. The protection board has two focus components: a protection IC, which uses an accurate comparator to obtain reliable protection parameters; the other is The MOSFET string continues to switch at high speed in the main charging and discharging loop to perform care actions. 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: Introduction to the safety of lead-acid batteries and lithium iron phosphate battery packs