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

Inactive Publication Date: 2009-02-04
BYD CO LTD
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Problems solved by technology

[0004] The present invention aims at the above-mentioned existing methods and devices for measuring battery internal resistance, which have the defects of complex circuits, high implementation costs, and even affecting battery life and capacity, and provides a simple and easy-to-use method without affecting battery life and capacity. Method and device for measuring battery internal resistance with low cost

Method used

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  • Method and apparatus for measuring battery internal resistance
  • Method and apparatus for measuring battery internal resistance
  • Method and apparatus for measuring battery internal resistance

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Embodiment Construction

[0011] First, the method provided by the present invention will be described.

[0012] The method for measuring the internal resistance of the battery provided by the present invention includes the following steps: making the battery under test 10 start to discharge, or start charging the battery 10 under test; detecting the discharge current or charging current I of the battery under test 10, and detecting the discharge or charging current I of the battery under test at the same time Voltage U during charging 1 ; Make the battery under test 10 stop discharging, or stop charging the battery 10 under test; detect the voltage U after the battery under test is discharged or charged 2 ; Calculate the internal resistance r of the battery to be tested 10, the internal resistance r=(U of the battery to be tested 10 2 -U 1 ) / I.

[0013] The battery under test 10 can be discharged externally by connecting the battery under test 10 in series with the resistor 26 , and the battery und...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 田林祖郑广月
Owner BYD CO LTD
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