Electricity-taking method and device for detecting battery internal resistance

Abstract

The invention discloses an electricity-taking method and device for detecting battery internal resistance. The method comprises the following steps of: generating at least a positive supply circuit and a negative supply circuit by a detected battery to supply power for at least one detecting circuit; and performing sampling the positive supply circuit and the negative supply circuit accurately. By using the electricity-taking method and device for detecting battery internal resistance, two or more than two detected batteries can be detected by using one detecting circuit; and the internal resistance of the detected battery can be detected on line or off line in real time and ultra-high common-mode rejection ratio can be obtained; the external influence on the detection precision is small, and the precision error can be less than 0.1 milliohm; the electricity-taking method and device for detecting battery internal resistance are applicable to various detection environments.

Description

technical field [0001] The invention relates to the field of battery internal resistance detection, in particular to a method and device for detecting battery internal resistance and taking electricity. Background technique [0002] refer to figure 1 as well as figure 2 , in the prior art, the power-taking methods of the battery internal resistance detection equipment usually include: [0003] 1. Take power from the AC mains, use an AC / DC (alternating current / direct current) converter to connect the detection circuit, and obtain the required voltage through a separate power supply; (such as figure 1 shown) [0004] 2. Take power from a certain battery, directly supply the detection circuit or connect the detection circuit through a DC / DC (direct current / direct current) converter, and provide voltage for the battery internal resistance detection equipment. (Such as figure 2 shown) [0005] In an ordinary battery internal resistance detection device, since the detected...

AI Technical Summary

Problems solved by technology

[0006] The common mode signal in the AC input in the above method 1 will be transmitted to the power output, directly affecting the detection accuracy; the AC / DC converter in the above method 1 will generate common mode and differential mode interference, which will affect the detection accuracy; the DC in the above method 2 The / DC converter will generate common mode and differential mode interference, which will affect the detection accuracy

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