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

Pending Publication Date: 2020-07-17
ZHEJIANG HUAYUN INFORMATION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

as attached Figure 4 As shown, its resistance test is not accurate enough, and it needs to be used in conjunction with an AC battery inter

Method used

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  • Battery internal resistance component measuring method and device
  • Battery internal resistance component measuring method and device
  • Battery internal resistance component measuring method and device

Examples

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Example Embodiment

[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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Abstract

The invention provides a battery internal resistance component measuring method. The battery internal resistance component measuring method comprises the steps of updating battery capacity data; charging or discharging the battery for a short time, and standing for a certain time; recording instantaneous voltage jump delta U1 at the initial standing moment and slowly changing voltage delta U2 so as to obtain direct-current internal resistance of the battery: R1 = [delta] U1/[delta] I, R2 = [delta] U2/[delta] I, wherein R1 comprises ohmic internal resistance and interface charge transfer internal resistance, R2 represents concentration polarization internal resistance of the battery under the condition, and [delta] I is charging or discharging current; and carrying out an alternating current internal resistance test on the battery after standing to obtain a resistance value R0 representing the ohmic internal resistance of the battery so as to obtain the electrochemical polarization internal resistance Rct = R1-R0 of the battery. The invention further provides a corresponding device for realizing the method. According to the battery internal resistance component measuring method anddevice, implementation of the scheme is simple, good accuracy is achieved when the internal resistance of the battery is measured, all components of the internal resistance of the battery can be wellidentified, and therefore a basis is provided for analyzing the health state of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method and device for measuring internal resistance components of batteries. Background technique [0002] The internal resistance of lithium-ion batteries is a key parameter that affects the power output performance of batteries. Due to the existence of battery ohmic internal resistance voltage drop and polarization overpotential, the battery charge and discharge curve will deviate from the battery open circuit voltage curve, resulting in a decrease in total output energy. At present, the research on the DC internal resistance of the battery is mainly focused on the detection and identification of the ohmic internal resistance component, and its change trend with the battery cycle aging process is studied, and it is used as a characteristic parameter to characterize the battery SOH. Each internal resistance component of the battery corresponds to dif...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R31/378
CPCG01R31/378G01R31/389
Inventor 钱东培金武军刘双宇董栋杨帆戴哲仁姜炯挺潘斌姜银珠洪杰徐志强许君杰沈伟雄薛飞王炯耿
Owner ZHEJIANG HUAYUN INFORMATION TECH CO LTD
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