Lithium battery intrinsically safe explosion-proof circuit

Abstract

The invention provides an intrinsically safe explosion-proof circuit for a lithium battery, which includes at least one level of short circuit protection circuit, each level of short circuit protection circuit includes: a triode, a field effect transistor, a capacitor and a plurality of resistors, the first end of the first resistor is connected to The positive pole of the previous stage circuit and the positive pole of the lithium battery, the second end of the first resistor is connected to the first end of the second resistor, the first end of the third resistor and the gate of the field effect transistor, the second end of the second resistor Connect the negative pole of the previous stage circuit, the second end of the third resistor is connected to the collector of the triode, the base of the triode is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the first end of the fifth resistor, The first terminal of the capacitor and the first terminal of the sixth resistor, the emitter of the triode are connected to the drain of the field effect transistor, the negative pole of the previous stage circuit, the first terminal of the seventh resistor and the second terminal of the sixth resistor, and the field The source of the effect transistor is connected to the second end of the fifth resistor, and the second end of the seventh resistor is connected to the second end of the capacitor.

Description

technical field [0001] The invention relates to communication technology, in particular to an intrinsically safe explosion-proof circuit of a lithium battery. Background technique [0002] With the rapid development of information technology, various wireless intelligent terminal devices have been widely used in people's production and life. As a new type of high-energy battery successfully developed in the 20th century, lithium batteries have been widely used in the field of handheld terminals. [0003] In coal mines, natural gas, petrochemical and textile fields, there are explosive gas and dust environments, and the electrical equipment used must comply with the intrinsically safe explosion-proof standards stipulated by the state. Due to the flammable and explosive characteristics of lithium batteries, the current short-circuit current amplitude of existing lithium battery management chips (Battery Management System, referred to as BMS) reaches tens of amperes, and the r...

AI Technical Summary

Problems solved by technology

Due to the flammable and explosive characteristics of lithium batteries, the current short-circuit current amplitude of existing lithium battery management chips (Battery Management System, referred to as BMS) reaches tens of amperes, and the response time is more than 100 microseconds, which cannot achieve intrinsic safety. The standard of explosion-proof short-circuit voltage / current below 12V / 5A, therefore, conventional lithium batteries cannot be used in explosive gas and dust environments, which limits the application of wireless intelligent terminal equipment in many fields such as coal mines, natural gas, petrochemicals, and textiles

Images