CN102393508A - Nondestructive diagnosis of battery performance - Google Patents

Nondestructive diagnosis of battery performance Download PDF

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Publication number
CN102393508A
CN102393508A CN2011102932401A CN201110293240A CN102393508A CN 102393508 A CN102393508 A CN 102393508A CN 2011102932401 A CN2011102932401 A CN 2011102932401A CN 201110293240 A CN201110293240 A CN 201110293240A CN 102393508 A CN102393508 A CN 102393508A
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CN
China
Prior art keywords
battery
charging
current
internal resistance
direct
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CN2011102932401A
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Chinese (zh)
Inventor
王太宏
罗雨
陈立宝
王耀玲
黄睿
李丽华
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湖南大学
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Priority to CN2011102932401A priority Critical patent/CN102393508A/en
Publication of CN102393508A publication Critical patent/CN102393508A/en

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Abstract

The invention relates to the technical field of lithium ion battery direct-current internal resistance measurement, in particular to a method for determining battery performance according to direct-current internal resistance of a battery, which is calculated according to a transient voltage jump difference value and instantaneous current of a lithium ion battery and a battery pack at the beginning or ending of charging and discharging. The method comprises the following steps of: (1) monitoring current values and terminal voltages of various batteries on line in the charging and discharging process of the lithium ion battery; (2) detecting and recording a voltage jump value of the battery at the beginning or ending of discharging (charging) of the lithium ion battery; (3) detecting and recording the instantaneous current flowing through the battery at the beginning or ending of discharging (charging) of the lithium ion battery; (4) dividing voltage jump different values of the various batteries by a current value to obtain a ratio called direct-current discharging (charging) internal resistance of the battery; and (5) referring to the pre-determined standard direct-current discharging (charging) internal resistance of the battery to determine the battery performance, wherein the battery is qualified when the direct-current discharging (charging) internal resistance of the battery is smaller than the standard value and the battery is non-qualified when the direct-current discharging (charging) internal resistance of the battery is greater than the standard value.

Description

Harmless diagnosis battery performance

Technical field

The present invention relates to lithium ion battery DC internal resistance field tests; Be meant that more specifically lithium ion battery is in charge and discharge process; According to it in discharge (charging) beginning or counting cell direct-current discharge (charging) internal resistance that suddenlys change of the transient voltage when finishing, and according to this direct-current discharge (charging) method of battery performance is confirmed in internal resistance.

Background technology

At present, a kind of charging/discharging apparatus that comprises lithium ion battery is provided, for example the lithium ion battery automatic detection device is implemented lithium ion charge and discharge process complete monitoring, detects lithium ion battery real time end voltage, the electric current of the battery of flowing through and battery capacity.As aforesaid automatic detection device; Provide with a kind of when utilizing lithium-ion electric tank discharge (charging) beginning and discharge to finish moment the mutation voltage difference and the ratio of momentary current confirm the method for battery performance, and claim that this ratio is direct-current discharge (charging) internal resistance.

Particularly, a kind of technology of battery direct-current discharge (charging) internal resistance and battery performance when being expressed in discharge (charging) is provided, battery performance is confirmed in this techniques make use lithium ion direct-current discharge (charging) internal resistance.Because for lithium ion battery, the internal resistance of cell is divided into ohmic internal resistance and polarization resistance.Ohmic internal resistance is made up of the contact resistance of electrode material, electrolytic solution, barrier film resistance and each several part part.The resistance that is caused by polarization when polarization resistance is meant electrochemical reaction comprises the resistance that activation polarization and concentration polarization cause.Battery internal resistance can have difference along with different output currents, battery access times, temperature and aging performance; The internal resistance of battery is one of of paramount importance characterisitic parameter of battery; It is the important parameter of characterizing battery life-span and battery operation state, is measurement electronics and ion transmit complexity in electrode outstanding feature.

Yet the lithium ion battery internal resistance is measured by internal resistance of cell appearance in the actual production; Adopt the AC signal test of 1000Hz; Need under the unloaded situation of battery, measure; For the lithium electrical testing brings a lot of inconvenience, the present invention provides a kind of can onlinely confirm battery direct-current discharge (charging) internal resistance, thereby in load or testing process, can confirm battery performance.

Flow out moment of a large amount of electric currents at lithium ion battery, battery terminal voltage will have the variation of bust this moment.When battery discharge finishes, terminal voltage will have the situation that jumps, and this jumps, the variation slope and the internal resistance of cell of bust have substantial connection.At first after battery begins discharge, a moment pressure drop Δ U1 is arranged, this is that ohmic internal resistance by battery causes.This part internal resistance promptly the DC internal resistance that will measure; The change in voltage that ohmic internal resistance causes is generally kept very short time; Cell voltage slowly descends afterwards, and the voltage in this stage descends and comprised that pressure drop and battery charge state that polarization produces change the battery open circuit voltage decline that causes.The internal resistance of cell in this stage is mainly caused by electrochemical reaction intermediate ion concentration, and its numerical value is along with strength of current and detection time is different and different.When battery stopped to discharge, cell voltage had the rising of a moment, and its changing value is Δ U2, and its size is identical with Δ U1, also was because the ohmic internal resistance of battery causes that DC-method generally all calculates internal resistance through measuring this rising magnitude of voltage.Be a process that voltage rises gradually afterwards, show the completion of inside battery electrochemical reaction, polarization fades away, stationary value of last cell voltage trend.The battery charging process change in voltage is just in time opposite, the change in voltage Δ U that ohmic internal resistance and polarization resistance cause on the occasion of.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of method of utilizing direct-current discharge (charging) internal resistance to confirm battery performance, and this method is simple, and assessment accurately.

Concrete grammar step of the present invention is following:

The on-line monitoring current value and the terminal voltage of a plurality of batteries of flowing through in the lithium ion battery charge and discharge process;

Battery mutation voltage value when detection and record lithium-ion electric tank discharge (charging) beginning perhaps finish;

Detect and the momentary current value of the battery of flowing through when record lithium-ion electric tank discharge (charging) beginning or end;

Divided by the momentary current value, gained is called direct-current discharge (charging) internal resistance of battery with the mutation voltage value of a plurality of batteries;

Confirm battery performance with reference to predetermined battery standard direct-current discharge (charging) internal resistance, and according to battery direct-current discharge (charging) internal resistance sorting battery.

Wherein, Lithium ion battery standard direct-current discharge (charging) internal resistance is provided by following steps: the lithium ion battery of statistics same model same process is under identical rate charge-discharge situation; Direct-current discharge (charging) internal resistance of test battery after discharge finishes, the upper middle value or the densely distributed district of getting wherein are standard value.

The invention has the beneficial effects as follows and to carry out on-line monitoring, measure accurately, simple, can monitor the polarization situation of lithium ion battery, and harmless, can accurately confirm the performance of lithium ion battery battery performance.

Description of drawings

Fig. 1 is a change in voltage synoptic diagram when being used to explain the lithium ion battery intermittent discharge;

Fig. 2 is used to explain that certain a battery discharges and recharges recording voltage change curve and voltage jump situation under certain multiplying power;

Fig. 3 is the direct-current discharge internal resistance standard value that is used to explain certain a battery of computing method statistics according to the present invention;

Fig. 4 is used to explain direct-current discharge internal resistance and the alternating-current measurement gained internal resistance comparison of monitoring certain a battery according to application the present invention.

Embodiment

Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.

Embodiment 1:

Utilize the lithium ion battery inspection device, do charge-discharge test for a certain lithium ion, and write down electric current, magnitude of voltage in the charge and discharge process; Get one of them complete charge and discharge process; With LSN (representing the test duration) is the X axle, and cell voltage is the mapping of Y axle, and as can be seen from the figure voltage is with discharging and recharging change of time; Find out easily in discharge beginning and discharge and finish sudden change all to occur, with reference to accompanying drawing 2.Calculate the discharge voltage die changing value of the zero hour, pick and place and establish moment beginning current instantaneous value by cable, divided by current instantaneous value, obtain the direct-current discharge internal resistance of battery with the voltage die changing value.Add up 20 direct-current discharge internal resistance sizes, statistics is seen accompanying drawing 3, and the upper middle value or the densely distributed district of getting wherein are standard value (here as can be seen from the figure the direct-current discharge internal resistance generally concentrates on below 80, is direct-current discharge internal resistance standard value so get 80).When this battery divides in manufacturing process in the perhaps use; Just can utilize this standard value to confirm battery performance; When the direct-current discharge internal resistance during greater than the mark value battery think that battery performance is defective, when the direct-current discharge internal resistance thinks that battery performance is qualified during less than standard value.

Embodiment 2:

Choose different internal resistance batteries and do loop test, get the 2nd complete charge and discharge process in each battery loop test process respectively, record discharge ionization voltage sudden change value and current instantaneous value.Calculate each battery direct-current discharge internal resistance, relatively the relation between direct-current discharge internal resistance and the internal resistance of alternating-current measurement gained.And be the X axle with the internal resistance of alternating-current measurement gained, the direct-current discharge internal resistance obtains accompanying drawing 4 for the mapping of Y axle.Can find out from accompanying drawing 4; The direct-current discharge internal resistance and the alternating-current measurement gained internal resistance of cell change basically identical; Explain that the direct-current discharge internal resistance is consistent to the battery performance estimation to battery performance estimation and alternating current discharge internal resistance, and harmless to battery performance, and the result estimates accurately.

Claims (5)

1. the method for lithium ion battery and the internal resistance of electric battery on-line direct current monitoring comprises the steps:
The on-line monitoring current value and the terminal voltage of a plurality of batteries of flowing through in the lithium ion battery charge and discharge process;
Battery bust magnitude of voltage when detecting and writing down lithium-ion electric tank discharge (charging) beginning or end;
Detect and the current value of the battery of flowing through when record lithium-ion electric tank discharge (charging) beginning or end;
The mutation voltage value is divided by current value with the discharge (charging) of a plurality of batteries beginning or when finishing, and gained is called direct-current discharge (charging) internal resistance of battery;
Confirm battery performance with reference to predetermined battery standard direct-current discharge (charging) internal resistance, if battery standard direct-current discharge (charging) internal resistance is otherwise defective less than standard value then battery is qualified.
2. according to lithium ion battery on-line direct current discharge (charging) internal resistance computing method of claim 1, the step of the said direct-current discharge of wherein said calculating (charging) internal resistance computing method comprises:
Handle mutation voltage value and momentary current value with the identical mode of on-line monitoring battery discharge (charging) process.
3. definite lithium ion battery standard direct-current discharge (charging) internal resistance step according to claim 1 comprises:
The lithium ion battery of statistics same model same process under identical rate charge-discharge situation, direct-current discharge (charging) internal resistance of battery after discharge (charging) beginning or end, the upper middle value or the densely distributed district of getting wherein are standard value.
4. the step according to definite lithium ion battery performance of claim 1 comprises:
With the direct-current discharge of monitoring gained in real time (charging) internal resistance and the contrast of standard direct-current discharge (charging) internal resistance value; If direct-current discharge (charging) internal resistance is littler than standard value; Then battery performance is qualified, if direct-current discharge (charging) internal resistance is bigger than standard value, then battery performance is defective.
5. according to a kind of electric battery on-line direct current discharge (charging) internal resistance monitoring of claim 1, comprising:
A plurality of lithium ion batteries;
Be used for said a plurality of lithium ion batteries are discharged and recharged real time monitoring apparatus;
Be used for detecting each electric current and the voltage and current detecting device of terminal voltage of said a plurality of lithium ion battery;
And control device; This control device is used to make described battery current and described terminal voltage digitizing; Voltage jump value and momentary current value during from said digitized electric current and terminal voltage counting cell discharge (charging) beginning or end; And calculate the ratio of voltage jump value and momentary current value, make of this ratio and predetermined battery standard direct-current discharge (charging) internal resistance and relatively confirm battery performance.
CN2011102932401A 2011-09-30 2011-09-30 Nondestructive diagnosis of battery performance CN102393508A (en)

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Cited By (17)

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CN102707238A (en) * 2012-06-01 2012-10-03 江苏省电力公司检修分公司 Storage battery performance on-line monitoring system and monitoring method
CN103135063A (en) * 2012-12-21 2013-06-05 郝勇 Detection and monitoring method of lead-acid storage battery
CN103454589A (en) * 2012-06-04 2013-12-18 中国科学院深圳先进技术研究院 Battery module performance detecting method for electric car
CN103529301A (en) * 2012-07-03 2014-01-22 上海汽车集团股份有限公司 Online measuring method for internal resistance of automotive battery and online measuring device for internal resistance of automotive battery
CN104034967A (en) * 2014-06-05 2014-09-10 浙江工业大学 Method for rapidly and accurately detecting internal resistance of secondary battery
CN104122451A (en) * 2014-07-08 2014-10-29 国家电网公司 Direct-current internal resistance measurement method for storage battery
CN104155609A (en) * 2013-12-31 2014-11-19 双新电器(郑州)制造有限公司 Maintenance-free lead-acid storage battery nondestructive testing method and nondestructive testing instrument
CN104749530A (en) * 2015-04-10 2015-07-01 普天新能源车辆技术有限公司 Discharging self-dissipation capacity decay estimation method and device of power battery
CN104849672A (en) * 2015-05-27 2015-08-19 中国人民解放军国防科学技术大学 Lithium battery dynamic impedance parameter identification method based on equivalent circuit model
CN105652212A (en) * 2016-02-05 2016-06-08 惠州市蓝微新源技术有限公司 Method for dynamically detecting consistency of battery pack
CN105938161A (en) * 2016-07-06 2016-09-14 惠州亿纬锂能股份有限公司 Battery internal resistance test method and system
CN106154171A (en) * 2016-06-17 2016-11-23 清华大学 Set up the method for damping function in battery DC
TWI586982B (en) * 2015-08-28 2017-06-11 友達光電股份有限公司 Method for calculating battery internal resistance
CN107783044A (en) * 2016-08-26 2018-03-09 神讯电脑(昆山)有限公司 Battery screening plant and its method
CN108398643A (en) * 2018-01-30 2018-08-14 合肥国轩高科动力能源有限公司 A kind of method that quick judgement secondary cell outside line ohmic polarization is excessive
CN109975716A (en) * 2019-03-07 2019-07-05 天津力神电池股份有限公司 A kind of detection method of lithium ion battery internal resistance fluctuation
CN109991553A (en) * 2017-12-29 2019-07-09 微宏动力系统(湖州)有限公司 A kind of evaluation method of battery SOC

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707238A (en) * 2012-06-01 2012-10-03 江苏省电力公司检修分公司 Storage battery performance on-line monitoring system and monitoring method
CN103454589A (en) * 2012-06-04 2013-12-18 中国科学院深圳先进技术研究院 Battery module performance detecting method for electric car
CN103454589B (en) * 2012-06-04 2016-01-27 中国科学院深圳先进技术研究院 The performance of battery module detection method of electric automobile
CN103529301A (en) * 2012-07-03 2014-01-22 上海汽车集团股份有限公司 Online measuring method for internal resistance of automotive battery and online measuring device for internal resistance of automotive battery
CN103135063A (en) * 2012-12-21 2013-06-05 郝勇 Detection and monitoring method of lead-acid storage battery
CN104155609A (en) * 2013-12-31 2014-11-19 双新电器(郑州)制造有限公司 Maintenance-free lead-acid storage battery nondestructive testing method and nondestructive testing instrument
CN104155609B (en) * 2013-12-31 2018-04-03 双新电器(郑州)制造有限公司 A kind of maintenance-free lead accumulator lossless detection method and nondestructive testing instrument
CN104034967A (en) * 2014-06-05 2014-09-10 浙江工业大学 Method for rapidly and accurately detecting internal resistance of secondary battery
CN104122451A (en) * 2014-07-08 2014-10-29 国家电网公司 Direct-current internal resistance measurement method for storage battery
CN104749530A (en) * 2015-04-10 2015-07-01 普天新能源车辆技术有限公司 Discharging self-dissipation capacity decay estimation method and device of power battery
CN104749530B (en) * 2015-04-10 2017-08-25 普天新能源车辆技术有限公司 A kind of electrokinetic cell discharges from power consumption Performance Decay evaluation method and device
CN104849672A (en) * 2015-05-27 2015-08-19 中国人民解放军国防科学技术大学 Lithium battery dynamic impedance parameter identification method based on equivalent circuit model
TWI586982B (en) * 2015-08-28 2017-06-11 友達光電股份有限公司 Method for calculating battery internal resistance
CN105652212B (en) * 2016-02-05 2017-05-17 惠州市蓝微新源技术有限公司 Method for dynamically detecting consistency of battery pack
CN105652212A (en) * 2016-02-05 2016-06-08 惠州市蓝微新源技术有限公司 Method for dynamically detecting consistency of battery pack
CN106154171A (en) * 2016-06-17 2016-11-23 清华大学 Set up the method for damping function in battery DC
CN106154171B (en) * 2016-06-17 2019-02-05 清华大学 The method for establishing damping function in battery DC
CN105938161A (en) * 2016-07-06 2016-09-14 惠州亿纬锂能股份有限公司 Battery internal resistance test method and system
CN107783044A (en) * 2016-08-26 2018-03-09 神讯电脑(昆山)有限公司 Battery screening plant and its method
CN109991553A (en) * 2017-12-29 2019-07-09 微宏动力系统(湖州)有限公司 A kind of evaluation method of battery SOC
CN109991553B (en) * 2017-12-29 2021-01-15 微宏动力系统(湖州)有限公司 Estimation method of battery SOC
CN108398643A (en) * 2018-01-30 2018-08-14 合肥国轩高科动力能源有限公司 A kind of method that quick judgement secondary cell outside line ohmic polarization is excessive
CN109975716A (en) * 2019-03-07 2019-07-05 天津力神电池股份有限公司 A kind of detection method of lithium ion battery internal resistance fluctuation

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Application publication date: 20120328