Device for measuring internal resistance of storage batteries

Abstract

The invention provides a device for measuring internal resistance of storage batteries. The device comprises a single chip microcomputer, a standard resistor, an amplification driving circuit, a metal-oxide-semiconductor field-effect transistor, a voltage synchronous acquisition unit and an internal resistance computation unit; the single chip microcomputer is used for controlling a storage battery to generate millisecond-level discharge current and comprises a current output unit, and the current output unit is used for generating constant current with a millisecond period and outputting the constant current intermittently; the standard resistor is connected with the storage battery, and a resistance value of the standard resistor is known; the amplification driving circuit is used for outputting square waves of voltage according to the constant current outputted by the current output unit so as to drive the metal-oxide-semiconductor field-effect transistor; the metal-oxide-semiconductor field-effect transistor is turned on and off intermittently according to the current outputted by the single chip microcomputer; the voltage synchronous acquisition unit is used for acquiring voltage of the storage battery; and the internal resistance computation unit is used for computing the internal resistance of the storage battery according to the resistance value of the standard resistor, voltage of the standard resistor and the voltage of the storage battery. The device has the advantage that problems of severe damage to storage batteries, high quantity of potential safety hazards and complexity and costliness of an existing measuring deice in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of accumulators, in particular to the field of measuring the internal resistance of accumulators, in particular to a device for measuring the internal resistance of accumulators. Background technique [0002] Batteries are used more and more in electric vehicles and hybrid vehicles, and the battery system generally adopts a series connection method. The state deterioration of some single batteries in the battery pack directly affects the overall capacity state of the battery pack, that is, the overall capacity state of the battery pack is determined by the capacity of one or several batteries in the most severely degraded state in the system. Therefore, it is very necessary to accurately measure the state of each single battery to prevent battery failure. [0003] Battery internal resistance is an important technical indicator to measure battery performance. The internal resistance of the battery refers to...

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Problems solved by technology

[0007] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a device for measuring the internal resistance of the storage battery, which is used to solve the problems of large damage to the storage battery and great safety hazards existing in the measurement of the internal resistance of the storage battery in the prior art. and the problem of complex and expensive measuring devices

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