A line connection method for measuring battery internal resistance

Abstract

The invention discloses a line connection method for measuring internal resistance of a battery. The method includes that a power line is used to enable a positive electrode and a negative electrode of a storage battery to be in series connection for acquiring voltage sampling value; the power line is used to enable the positive electrode of the storage battery to pass a negative electrode of a first storage battery to connect with a first interface of a load resistance; and the power line is used to enable the negative electrode of the storage battery to pass a positive electrode of a second storage battery to connect with a second interface of the load resistance for conducting constant-current discharging of the storage battery. By adoption of the line, the internal resistance value of the storage battery is figured out according to Ohm law. The method enables the voltage sampling line and a discharge line to be separated, and therefore line voltage drop caused by large current in discharge process is avoided, and measuring accuracy of the internal value of the storage battery cannot be influenced.

Description

technical field [0001] The invention relates to the field of power systems, and more specifically relates to a line connection method for measuring the internal resistance of a storage battery. Background technique [0002] In the power system, there is a close relationship between the capacity of the battery and its internal resistance. Therefore, in order to improve the overall performance of the battery in the power system, on-line monitoring of the internal resistance of the battery has always been a hotspot with important research significance in power companies. [0003] Generally speaking, the capacity of the battery is inversely proportional to its internal resistance, that is, the larger the capacity, the smaller the internal resistance; conversely, the larger the internal resistance, the smaller the capacity of the battery. In the prior art, a method for measuring the internal resistance of the storage battery in the power system can be found in figure 1 , figur...

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Problems solved by technology

[0005] In view of this, the present invention provides a line connection method for measuring the internal resistance of the storage battery to overcome the problem of low accuracy of the internal resistance test in the prior art due to the line voltage drop caused by directly connecting the storage battery and the load resistance in series

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