Battery internal resistance component measuring method and device
A battery internal resistance and measurement method technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of inaccurate resistance testing and achieve the effect of simple implementation and good accuracy
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[0037] Example 1
[0038] The first embodiment of the present invention provides a method for measuring a battery internal resistance component, comprising the following steps:
[0039] 1. To update the battery capacity data to avoid the impact of C-rate differences on the test results, you can first charge the battery to a fully charged state with the CCCV charging method, and then discharge the CCCV to the cut-off voltage. In the CV charge / discharge stage, the cut-off current is not greater than 1 / 20 of the rated capacity, or directly discharged to the cut-off voltage at 1 / 20C, and the capacity value at this time is recorded as the new C. Charge or discharge the battery for a short time, and make the SOC of the battery be in the range of 10%-90% after discharge, then let it stand for no less than 10 minutes, and the discharge current is usually no less than 1 / 5C.
[0040] Alternatively, in the case of unknown battery capacity, it can also be measured by:
[0041] 1. Charge...
Example Embodiment
[0047] Example 2
[0048] The second embodiment of the present invention provides a battery internal resistance component measuring device, such as Figure 5 shown, which includes:
[0049] A series battery pack composed of n lithium batteries connected in series is connected to a charge and discharge controller (PCS) for charging and discharging the series battery pack. AC internal resistance tester (IRT), two analog switch groups (SA) that control the link between the AC internal resistance tester and a single battery, respectively connected to the charge and discharge controller and the analog switch group, used to record charge and discharge During the process, the data acquisition device (DAQ) of the terminal voltage and circuit current of each single battery, and the upper computer connected with the data acquisition device (DAQ), the charge and discharge controller (PCS) and the AC internal resistance tester (IRT), It is used to control the operation of each device and ...
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