Wide-temperature protection device for lithium iron phosphate battery

Abstract

The invention discloses a lithium iron phosphate battery wide-temperature protection device in the technical field of battery protection. The device comprises four lithium iron phosphate batteries BTs, a chip U1, a resistor R, an MOSFET tube Q, a capacitor C and a thermal protector KT, wherein after the four lithium iron phosphate batteries are connected in series, the positive electrode of the fourth lithium iron phosphate battery BT4 is connected to the pin 16 VDD of the chip U1 to provide a power supply positive electrode for the chip U1, and the negative electrode of the first lithium ironphosphate battery BT1 is connected to the pin 7 VSS of the chip U1 through a resistor R4 so as to provide a supply power negative electrode for the chip U1. According to the invention, the device mainly aims at a rechargeable lithium iron phosphate battery and an integrated circuit board playing a role in protection, can effectively prevent the battery from being overcharged, overdischarged, overcurrent and short-circuited, provides ultrahigh-temperature working environment safety, achieves a micro-heating control circuit, and solves high-efficiency operation of the battery pack in an extremely low-temperature environment.

Description

technical field [0001] The invention relates to the technical field of battery protection, in particular to a wide temperature protection device for a lithium iron phosphate battery. Background technique [0002] Lithium iron phosphate battery is currently used as a new type of environmentally friendly, high-efficiency, and instantaneous high-current discharge power battery. Its unique performance is gradually accepted by the market. At present, it is mainly used in solar street lights, electric tools, cars, and trains. In high-speed rail and other fields, the nominal voltage of a single lithium iron phosphate power battery is 3.2V. In order to meet the needs of use, multiple batteries must be connected in series to achieve the required voltage. After the same batch of batteries is made, their capacity and There is a differential in the internal resistance, so batteries with a small difference in internal resistance and capacity must be matched in a group before combination,...

AI Technical Summary

Problems solved by technology

For a battery pack composed of multiple batteries connected in series, each battery in the battery pack needs to be charged and discharged. Because solar street lights require a high input voltage, even an instantaneously variable voltage, the existing general-purpose battery The protective plate can no longer satisfy the promotion and application of the battery in the field of solar energy, hindering its promotion in this field

In order to solve this problem, it is necessary to use electronic devices with high withstand voltage and high instantaneous current impact resistance, which will inevitably result in large volume and high cost, which cannot meet the development requirements of technology. Based on this, the present invention designs a lithium iron phosphate Battery wide temperature protection device to solve the above problems

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