Method and apparatus for measuring battery internal resistance

A technology of battery internal resistance and battery to be tested, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems affecting battery life and capacity, complex circuits, and high implementation costs, and achieve low implementation costs and simple circuits. Effect
CN101359035AInactive Publication Date: 2009-02-04BYD CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
BYD CO LTD
Publication Date
2009-02-04
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention provides a method and a device for measuring the battery internal resistance; the method and the device detect a discharge current or charge current I, as well as a discharge or charge voltage U1 of the battery under detection, and then detect a voltage U2 after discharge or charge of the battery under detection so as to calculate an internal resistance r of the battery under detection; and the internal resistance r is equal to (U2-U1) / I. The method and the device are easy to implement and are low in cost, which can be widely used in battery chargers, back-up power supplies and other mobile power supplies.
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Description

technical field

[0001] The invention relates to a method and device for measuring battery internal resistance. Background technique

[0002] Measuring battery internal resistance is especially important for evaluating the life of secondary rechargeable batteries. At present, there are mainly two kinds of methods and devices for measuring the internal resistance of batteries: one is the AC test method, such as the technical solution disclosed in CN1818684A, which applies a periodic AC current with the same peak value at the two ends of the comparison resistance and the battery to be tested respectively, Then measure the voltage response caused by the current at both ends of the comparison resistor and the battery to be tested. Since the current is the same, the internal resistance of the battery to be tested can be determined through proportional calculations and the resistance value of the comparison resistor. This method and device require alternating current. Various sign...

Claims

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