Battery internal resistance detection circuit and battery internal resistance detection method and apparatus

Abstract

The invention discloses a battery internal resistance detection circuit and a battery internal resistance detection method and an apparatus. The battery internal resistance detection circuit comprises an injection current module that is used to input the current into a battery to be detected based on a current injection signal transmit by a control module; the module that is used to control an injection current module, a voltage detection module and a multipath selection module for cooperation and obtain the battery internal resistance finally; a voltage detection module that is used to detect the voltage corresponding to the battery to be detected and send the detection result to the control module based on a voltage acquisition signal transmit by the control module; the multipath selection module that is used to process the voltage signal of the battery to be detected based on the number of the battery to be detected by the control module, and send the processed voltage signal to the control module. According to the invention, the structure of the battery internal resistance detection circuit is simplified, and the design cost is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a battery pack internal resistance detection circuit and a battery pack internal resistance detection method and device. Background technique [0002] The traditional battery capacity detection method is to perform a check discharge of the whole group, that is, connect the battery group to the load box, and then discharge until the cut-off voltage (no power) is used to verify the capacity of the battery, but there are many methods Hidden dangers and disadvantages: [0003] a. The discharge time is long, the risk is high, the battery pack must be separated from the system, and the chemical energy stored in the battery pack is all consumed in the form of heat energy, which not only wastes electric energy, but also takes time and effort, and the efficiency is low. [0004] b. To carry out the checking discharge test, certain conditions must be met. First, it must be carri...

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Problems solved by technology

[0002] The traditional battery capacity detection method is to perform a check discharge of the whole group, that is, connect the battery group to the load box, and then discharge it until the cut-off voltage (no power) to verify the capacity of the battery, but there are many methods Hidden dangers and disadvantages:

[0008] During the process of detecting the internal resistance of the battery pack, the inventor found at least the following problems in the prior art: In the prior art scheme, the internal resistance detection circuit of the battery pack is relatively complicated and often uses an operational amplifier, which needs a separate power supply, and the circuit structure is relatively complicated

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