CN105891603A - Method for measurement of battery direct current internal resistance based on charger - Google Patents

Method for measurement of battery direct current internal resistance based on charger Download PDF

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Publication number
CN105891603A
CN105891603A CN201410758038.5A CN201410758038A CN105891603A CN 105891603 A CN105891603 A CN 105891603A CN 201410758038 A CN201410758038 A CN 201410758038A CN 105891603 A CN105891603 A CN 105891603A
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China
Prior art keywords
battery
module
charging
internal resistance
acquisition module
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CN201410758038.5A
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Chinese (zh)
Inventor
陈琳
田彬彬
林伟龙
潘海鸿
黄炳琼
李海波
李君子
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Guangxi University
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Guangxi University
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Pending legal-status Critical Current

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Abstract

The present invention provides a method for measurement of battery direct current internal resistance based on a charger. The problem is solved that the battery direct current internal resistance is measured by peeling the battery through off-line measurement and a special device in the prior art. The method comprises the main steps: when the SoC detection module detects that the SoC reaches 30-80% at the first time, and the constant current I1 is used for charging a lithium ion battery/battery pack for T1 time and recording the current voltage data of the lithium ion battery/battery pack to be U1; the constant current I2 is used for charging a lithium ion battery/battery pack for T1 time and recording the current voltage data of the lithium ion battery/battery pack to be U2; and the data collected by a current acquisition module and a voltage acquisition module is transmitted to a calculation module after being filtered by a digital filtering module, and the battery direct current internal resistance of the battery to be measured is calculated by the calculation module according to the format: Rdc=[Delta]U/[Delta]I=(U2-U1)/(I2-I1). The method for measurement of battery direct current internal resistance based on a charger is able to measure the battery direct current internal resistance while charging the battery, and is able to be transplanted on a charging device in the prior art to make the measurement more convenient.

Description

The method measuring battery DC internal resistance based on charger
Technical field
The invention belongs to field of batteries, relate to a kind of method measuring battery DC internal resistance based on charger, particularly a kind of use Measuring method in lithium ion battery of electric automobile DC internal resistance.
Background technology
Fast development along with World Economics and the attention to environmental consciousness, the popularity rate of automobile is more and more higher, simultaneously to car tail The requirement of gas discharge is more and more higher.Energy-conservation and low emission the electric hybrid vehicle of oil and ideal energy-conservation, free of contamination " zero-emission " Pure electric automobile is following development trend.The internal resistance of battery is one of of paramount importance characterisitic parameter of battery, and it is to characterize battery Life-span and the important parameter of battery operation state, be to weigh electronics and ion to transmit the outstanding feature of complexity in electrode. The internal resistance of cell includes ohmic internal resistance and polarization resistance.Ohmic internal resistance is determined by electrode material, electrolyte, barrier film etc.;Polarization The resistance caused by polarization when internal resistance refers to electrochemical reaction, the resistance caused including activation polarization and concentration polarization etc..At electricity Pond produces and in test, and ohmic internal resistance is also called AC internal Resistance, and ohmic internal resistance and polarization resistance sum are referred to as DC internal resistance.Tradition Method measurement is the exchange constant current signal by injecting certain frequency to battery, catches the battery Voltage Feedback to this alternating current simultaneously Signal, thus measure the AC impedance of battery.Technical scheme as disclosed in CN1818684 is by mesuring battary two ends The aperiodic alternating voltage stream applying peak value identical is measured, and is to complete inner walkway at discharge regime, and needs stripping battery to set Standby, waste time and energy;The method, during realizing, is equivalent to, to injecting an interference signal in system, affect system stability.
In electric automobile field, if automobile batteries internal resistance can be measured in charging simultaneously, user just can be effectively reminded to change electricity in time Pond, to avoid the trouble or the disaster that cause because of cell degradation.
Summary of the invention
The object of the invention aims to provide a kind of method measuring battery DC internal resistance based on charger, solves existing measurement battery straight Stream internal resistance needs peel off battery off-line measurement and by the problem of particular device, thus need to improve the efficiency measuring DC internal resistance.
For realizing above-mentioned target, the technical scheme that this method is used is:
The device that the method is used includes control module 1, data acquisition module 2, current acquisition module 3, voltage acquisition module 4, charging module 5.Described control module includes digital filtering module 1.1, computing module 1.2, human-computer interaction module 1.3, fills Electric control module 1.4.Charge control module 1.4 in described control module controls charging module 5 to battery/battery pack charging, electricity Stream acquisition module 3 and voltage acquisition module 4 gather the voltage x current data of battery/battery pack respectively and send data acquisition module 2 to, The data digital filtration module 1.1 collected is input to computing module 1.2 by data acquisition module 2, and computing module 1.2 will calculate Obtain battery/battery pack total DC internal resistance result to show on human-computer interaction module 1.3.
The method operation instruction measuring battery DC internal resistance based on charger (following it is assumed to be according to the currently practical feelings of rechargeable battery Condition is determined): when charging process, detect battery current SoC value by battery charger dump energy SoC detection module;False When determining SoC >=98%, representing that battery has been in fully charged state, charging terminates;Assuming that during 98% > SoC >=80%, charger is direct Battery is charged, until battery completely fills;Assuming that during SoC < 30%, battery is directly charged by charger, reaches at SoC When 30%~80%, the concrete steps of the method measuring battery DC internal resistance based on charger:
Step one: when SoC detection module detects that SoC reaches between 30%~80% first, charge control module 1.4 is controlled Charging module 5 processed is with constant current I1To lithium ion battery/battery pack charging T1Second;At charging T1Second terminate while data acquisition Module 2 gathers the voltage data of battery/battery pack by voltage acquisition module 4, is designated as U1
Step 2: charge control module 1.4 controls charging module 5 with constant current I2To lithium ion battery/battery pack charging T2Second, At charging T2Second terminate while data acquisition module 2 gathered the voltage data of battery/battery pack, note by voltage acquisition module 4 For U2
Step 3: the data that current acquisition module 3 and voltage acquisition module 4 collect deliver in digital filtering module 1.1 after, Being input to computing module 1.2, computing module 1.2 is according to computing formula: Rdc=Δ U/ Δ I=(U2-U1)/(I2-I1) calculate DC internal resistance R that battery DC internal resistance/battery pack is totaldc, result is exported and shows on human-computer interaction module 1.3;
Step 4: battery is directly charged by charger, until being full of.
Wherein, described constant current I1Span is set as: 0.2C~0.5C;Use constant current I1Charging T1Value model Enclose and be set as: 1 second~5 seconds;Described constant current I2Span is set as: 0.6C~1.2C;Use constant current I2's Charging T2Span be set as: 1 second~5 seconds.
The beneficial effects of the present invention is: the method for a kind of based on charger the measurement battery DC internal resistance that the present invention provides, right While battery charging, battery DC internal resistance can be measured, this measuring method can be transplanted on existing charging equipment, make measurement More convenient.The method need not specially off-line measurement battery DC internal resistance, be i.e. not required to particular device and just can realize internal resistance measurement.
Accompanying drawing explanation
Fig. 1 is the structural representation of the used device of implementation;
Fig. 2 is the structural representation of control module 1 in the structural representation of the used device of implementation;
Fig. 3 is the flow chart of present implementation;
Fig. 4 is the current diagram of the embodiment of present implementation.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the device that method described in present implementation is used includes: include control module 1, data acquisition module Block 2, current acquisition module 3, voltage acquisition module 4, charging module 5;
As shown in Figure 2, described control module 1 include digital filtering module 1.1, computing module 1.2, human-computer interaction module 1.3, Charge control module 1.4;
Charge control module 1.4 in control module 1 controls charging module 5 to battery/battery pack charging, voltage acquisition module 4 The voltage x current data gathering battery/battery pack with current acquisition module 3 respectively send data acquisition module 2, data acquisition module to Block 2 is by the data collected in digital filtering module 1.1 is transported to computing module 1.2, and computing module 1.2 is according to computing formula: Rdc=Δ U/ Δ I=(U2-U1)/(I2-I1), calculating acquisition battery/battery pack total DC internal resistance result is shown at man-machine interaction mould On block 1.3;
Specific embodiment 1:
Method flow diagram is as shown in Figure 3, it is assumed that the battery current SoC value of detection is less than 30% (i.e. 30% > SoC), fills Electricity electric current as shown in Figure 4, implements step as follows:
Step one: detect that when battery current SoC value is 10%, then (current value is by charger self with a certain electric current for charger Depending on design) to lithium ion battery/battery pack charging;
Step 2: when SoC detection module detects that SoC value meets between 30%~80% first, with I1=0.3C electric current Pattern is to the charging of lithium ion battery/battery pack, after charge 1 second (or charging interval choose 1 second~the arbitrary value of 5 seconds) terminates, several Gather battery voltage data according to acquisition module (2) by voltage acquisition module 4, be designated as U1
Step 3: with I2=0.8C current-mode to the charging of lithium ion battery/battery pack, charging 1 second (or the charging interval choose 1 second~the arbitrary value of 5 seconds) terminate after, data acquisition module (2) gathers battery voltage data by voltage acquisition module 4, note For U2
Step 4: the data that current acquisition module (3) and voltage acquisition module (4) are collected, filtered module (1.1) Being input to computing module (1.2), computing module (1.2) is according to computing formula: Rdc=Δ U/ Δ I=(U2-U1)/(I2-I1) Go out DC internal resistance R that battery DC internal resistance/battery pack is totaldc, result is exported the upper display of human-computer interaction module (1.3);
Step 5: lithium ion battery/battery pack is charged by charger with a certain electric current (depending on current value is designed by charger self), Until the SoC value detected reach 98% and be considered as above battery be full of.
Specific embodiment 2:
Assuming that when the current SoC of battery of detection is between 30%~80% (80% > SoC >=30%), method flow diagram such as accompanying drawing Shown in 3, step is as follows:
Step one: when SoC detection module detects that current SoC value is 40% first, with I1=0.3C current-mode to lithium from The charging of sub-battery/battery pack, after charging 1 second (or charging interval choose 1 second~the arbitrary value of 5 seconds) terminates, data acquisition module Block (2) gathers battery voltage data by voltage acquisition module 4, is designated as U1
Step 2: with I2=0.8C current-mode to the charging of lithium ion battery/battery pack, charging 1 second (or the charging interval choose 1 second~the arbitrary value of 5 seconds) terminate after, data acquisition module (2) gathers battery voltage data by voltage acquisition module 4, note For U2
Step 3: the data that current acquisition module (3) and voltage acquisition module (4) are collected, filtered module (1.1) Being input to computing module (1.2), computing module (1.2) is according to computing formula: Rdc=Δ U/ Δ I=(U2-U1)/(I2-I1) Go out DC internal resistance R that battery DC internal resistance/battery pack is totaldc, result is exported the upper display of human-computer interaction module (1.3);
Step 4: lithium ion battery/battery pack is charged by charger with a certain electric current (depending on current value is designed by charger self), Until battery is full of.
Specific embodiment 3:
Assuming that when the current SoC of battery of detection is between 80%~98% (98% > SoC >=80%), method flow diagram is the most attached Shown in Fig. 3, step is as follows:
Step one: when SoC detection module detects that current SoC value is 90%, (current value is by filling with a certain electric current for charger Depending on electrical equipment self design) to lithium ion battery/battery pack charging, until battery is full of.
Specific embodiment 4:
Assuming that detection battery current SoC >=98% time, as shown in Figure 3, step is as follows for method flow diagram:
Step one: when SoC detection module detects that current SoC value is 99%, then stop charging.
In this description, it is noted that above example is only the more representational example of the present invention.Obviously the present invention not office It is limited to above-mentioned specific embodiment, it is also possible to make various amendment, convert and deform.Therefore, specification and drawings is considered as It is illustrative and be not restrictive.Any simple modification that above example is made by every technical spirit according to the present invention, Equivalent variations and modification, be all considered as belonging to protection scope of the present invention.

Claims (3)

1. the method measuring battery DC internal resistance based on charger, the device that the method uses includes control module (1), data acquisition module (2), current acquisition module (3), voltage acquisition module (4), charging module (5);
Described control module (1) includes digital filtering module (1.1), computing module (1.2), human-computer interaction module (1.3), charge control module (1.4);
Charge control module (1.4) in described control module (1) controls charging module (5) to battery/battery pack charging;Described voltage acquisition module (4) and current acquisition module (3) gather the voltage x current data of battery/battery pack respectively and send data acquisition module (2) to;Described data acquisition module (2) by the data collected in digital filtering module (1.1) is transported to computing module (1.2);Calculating acquisition battery/battery pack total DC internal resistance result is shown on human-computer interaction module (1.3) by described computing module (1.2);
It is characterized in that, the detailed process of the method measuring battery DC internal resistance based on charger is:
Step one: when SoC detection module detects that SoC reaches between 30%~80% first, described charge control module (1.4) controls charging module (5) with constant current I1To lithium ion battery/battery pack charging T1Second;While the charging second terminates, data acquisition module (2) gathers the voltage data of battery/battery pack by voltage acquisition module (4), is designated as U1
Step 2: described charge control module (1.4) controls charging module (5) again with constant current I2To lithium ion battery/battery pack charging T2Second;While the charging second terminates, data acquisition module (2) gathers the voltage data of battery/battery pack by voltage acquisition module (4), is designated as U2
Step 3: after the data that described current acquisition module (3) and voltage acquisition module (4) collect are transported to digital filtering module (1.1), filtered data are transported to computing module (1.2) again, and computing module (1.2) is according to computing formula: Rdc=Δ U/ Δ I=(U2-U1)/(I2-I1) calculate the DC internal resistance that battery DC internal resistance/battery pack is total, result is exported the upper display of human-computer interaction module (1.3).
The method measuring battery DC internal resistance based on charger the most according to claim 1, it is characterised in that the span of constant current described in step one is set as: 0.2C~0.5C;The span using the charging of constant current is set as: 1 second~5 seconds.
The method measuring battery DC internal resistance based on charger the most according to claim 1, it is characterised in that the span of constant current described in step 2 is set as: 0.6C~1.2C;The span using the charging of constant current is set as: 1 second~5 seconds.
CN201410758038.5A 2014-12-12 2014-12-12 Method for measurement of battery direct current internal resistance based on charger Pending CN105891603A (en)

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Cited By (3)

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CN106597107A (en) * 2016-12-19 2017-04-26 天津力神电池股份有限公司 Method for selecting clamp for lithium ion battery charging and discharging test device
CN109606142A (en) * 2018-12-06 2019-04-12 安徽盛德能源互联网研究院有限公司 A kind of automobile charger with detection function
CN109752664A (en) * 2018-11-29 2019-05-14 嘉兴梅森储能设备有限公司 A kind of charging detects the method and application of battery core internal resistance in battery pack

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN106597107A (en) * 2016-12-19 2017-04-26 天津力神电池股份有限公司 Method for selecting clamp for lithium ion battery charging and discharging test device
CN109752664A (en) * 2018-11-29 2019-05-14 嘉兴梅森储能设备有限公司 A kind of charging detects the method and application of battery core internal resistance in battery pack
CN109606142A (en) * 2018-12-06 2019-04-12 安徽盛德能源互联网研究院有限公司 A kind of automobile charger with detection function

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