CN107037365A - A kind of measuring method of power lithium cell electric core - Google Patents

A kind of measuring method of power lithium cell electric core Download PDF

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Publication number
CN107037365A
CN107037365A CN201611030656.3A CN201611030656A CN107037365A CN 107037365 A CN107037365 A CN 107037365A CN 201611030656 A CN201611030656 A CN 201611030656A CN 107037365 A CN107037365 A CN 107037365A
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China
Prior art keywords
resistance
deviation
battery core
battery
temperature rise
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CN201611030656.3A
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Chinese (zh)
Inventor
陈佰爽
李�杰
虞舜
谭立骋
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上海中兴派能能源科技股份有限公司
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Priority to CN201611030656.3A priority Critical patent/CN107037365A/en
Publication of CN107037365A publication Critical patent/CN107037365A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644Constructional arrangements
    • G01R31/3648Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables

Abstract

The present invention relates to the voltage data during each battery core charge and discharge cycles in a kind of detection technique field, more particularly to a kind of measuring method of power lithium cell electric core, including acquisition dynamic lithium battery and temperature rise data;Detect the internal resistance of each battery core of the dynamic lithium battery;According to the voltage data, temperature rise data, internal resistance combination predetermined computation method formation result of calculation;Judged result according to result of calculation formation corresponding to each battery core is exported.Without individually being dismantled to battery core, avoid causing battery core in unloading process damage, whole detection time is also reduced indirectly simultaneously, secondly, it is necessary to which bath resistance, electrochemistry resistance to battery core detect that detection time is short, it is the health status that can determine whether battery core finally according to electrolyte internal resistance, electrochemistry internal resistance, temperature rise data and voltage data, without carrying out complicated internal characteristic detection, detection efficiency is substantially increased, while also reducing testing cost.

Description

A kind of measuring method of power lithium cell electric core
Technical field
The present invention relates to a kind of detection technique field, more particularly to a kind of measuring method of power lithium cell electric core.
Background technology
Dynamic lithium battery echelon, which is utilized, to be referred to, after dynamic lithium battery was used to 1 year time limit, its capacity can not meet electricity When electrical automobile is continuing with, battery pack is disassembled as battery module even battery core, can be by by screening according to eliminating Rank is respectively using to communication power supply, solar street light, energy storage field so that dynamic lithium battery can continue to bring extra power into play, to carry The utilization ratio of high-energy source.
During dynamic lithium battery echelon is utilized, its key is how to filter out effective battery core.Traditional processing method There are two kinds, one kind is ignored and other field during the battery core of failure state is directly applied has been in battery module directly to use, Under such a processing method, effective battery core is used in conjunction with invalid battery core, and the service efficiency of effective battery core is have impact on indirectly, while electric The output voltage of pond module is indefinite.Another is that overall eliminate uses, i.e., after battery pack is disassembled, each battery module is entered Row measurement, gives entirety to the underproof battery module of measurement and eliminates, and so operation can slattern many effective battery cores, reduce The utilization rate that echelon is utilized.
In order to improve the utilization ratio of battery core, in the prior art, each battery core is individually dismantled, to the electricity disassembled Core, the health status of the comprehensive descision battery core, interior feature detection are detected by carrying out interior special efficacy detection and external characteristics to the battery core At least include X-ray diffraction detection, ESEM, projection Electronic Speculum, mass spectrum Electronic Speculum lamp chemical means to electrode, electric separator, electrolysis Liquid and SEI films are analyzed, and external characteristics detection mainly judges the apparent condition of the battery core.Time-consuming for such a detection mode, Efficiency is low and cost is higher (detecting instrument cost is high).In addition in battery core unloading process, it is also easy to cause battery core to damage.
The content of the invention
The present invention provides the measuring method of power lithium cell electric core, it is intended to reduces the detection time of dynamic lithium battery core, carry High efficiency, reduce cost.
On the one hand, the present invention provides a kind of measuring method of power lithium cell electric core, wherein;Including,
Obtain dynamic lithium battery in each battery core charge and discharge cycles during voltage data and temperature rise data;
Detect the internal resistance of each battery core of the dynamic lithium battery;
According to the voltage data, temperature rise data, internal resistance combination predetermined computation method formation result of calculation;
Judged result according to result of calculation formation corresponding to each battery core is exported.
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, obtain the dynamic lithium battery discharge and recharge and follow The voltage data and temperature rise data of each battery core during ring include:
Each battery core during the last charge and discharge cycles of the dynamic lithium battery is read in battery management system Voltage data and temperature rise data.
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, detect each battery core of dynamic lithium battery Internal resistance, including:The resistance includes bath resistance, electrochemistry resistance;
Apply alternating current of the frequency not less than 1Khz to the dynamic lithium battery to form the electricity of each battery core to measure Solve liquid resistance;
Apply frequency to the dynamic lithium battery to be less than 1hz alternating current to form the electrochemistry of each battery core to measure Resistance.
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, the computational methods include, deviation voltage Calculating, deviation temperature rise calculating, deviation bath resistance and deviation electrochemistry resistance calculations;
Wherein, the deviation voltage is calculated as:
Wherein, △ V are the deviation voltage, ViFor the voltage data of i-th of battery core,For average voltage;V is voltage threshold Value;I is positive integer.
Wherein, the deviation temperature rise is calculated as:
Wherein, △ T are the deviation temperature rise, TiFor the temperature rise data of i-th of battery core,For average temperature rising;T is temperature rise threshold Value;
Wherein, the deviation bath resistance is calculated as:
Wherein, △ R1iFor the deviation bath resistance, R1iFor the bath resistance of i-th of battery core,For average electrolysis Liquid resistance;R1For bath resistance threshold value;
Wherein, the deviation electrochemistry resistance calculations are:
Wherein, △ R2iFor the deviation electrochemistry resistance, R2iFor the electrochemistry resistance of i-th of battery core,For average electrification Learn resistance;R2For electrochemistry resistance threshold;
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, corresponded to according to result of calculation formation The judged result output of each battery core;Wherein, the result of calculation include the deviation voltage, the deviation temperature rise, it is described partially Poor bath resistance and the deviation electrochemistry resistance, in the deviation voltage, the deviation temperature rise, deviation electrolyte electricity Resistance and the deviation electrochemistry resistance are respectively less than in the state of zero, and the judged result is qualified.
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, the computational methods of the average voltage are:
Wherein, n is the sum of the battery core, wherein, i≤n.
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, the computational methods of the average temperature rising are:
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, the computational methods of the bath resistance For:
Preferably, the measuring method of above-mentioned power lithium cell electric core, wherein, the computational methods of the electrochemistry resistance For:
Compared with prior art, the advantage of the invention is that:
In the present invention, the voltage data and temperature rise data during each battery core charge and discharge cycles and each electricity are utilized The electrolyte internal resistance of core, electrochemistry resistance, which calculate, forms a judged result, judges whether battery core closes by the judged result Lattice, without individually being dismantled to battery core, it is to avoid damage is caused in unloading process to battery core, while also reducing whole inspection indirectly The survey time, secondly, it is necessary to which bath resistance, electrochemistry resistance to battery core detect that detection time is short, finally according to electrolysis Liquid internal resistance, electrochemistry internal resistance, temperature rise data and voltage data are the health status that can determine whether battery core, without carrying out complicated interior spy Property detection, detection efficiency is substantially increased, while also reducing testing cost.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the measuring method of power lithium cell electric core provided in an embodiment of the present invention;
Fig. 2 is a kind of flow chart of the measuring method of power lithium cell electric core provided in an embodiment of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
Based on the elaboration in background technology, in the prior art, it is necessary to first be dismantled to battery core, then to the electricity after dismounting Core carries out interior special efficacy detection and external characteristics detection, wherein, interior feature detection at least includes X-ray diffraction detection, ESEM, throwing Radio mirror, mass spectrum Electronic Speculum lamp chemical means are analyzed the electrode in battery core, electric separator, electrolyte and SEI films, detect journey Sequence is more, and one is bonded in addition, being included in general battery modules and relying on various gelatin substances between multiple battery cores, multiple battery cores Rise, so being dismantled when disassembling firstly the need of to gelatin substance, but destruction battery core is tended to during this in itself. Based on this, as shown in figure 1, the present embodiment provides a kind of measuring method of power lithium cell electric core, wherein;Including,
The voltage data and temperature rise number during each battery core charge and discharge cycles in step S110, acquisition dynamic lithium battery According to;
Step S120, each battery core of the detection dynamic lithium battery internal resistance;Including:The resistance includes electrolyte Resistance, electrochemistry resistance;
Apply alternating current of the frequency not less than 1Khz to the dynamic lithium battery to form the electricity of each battery core to measure Solve liquid resistance;
Apply frequency to the dynamic lithium battery to be less than 1hz alternating current to form the electrochemistry of each battery core to measure Resistance.
Step S130, according to the voltage data, temperature rise data, internal resistance combination predetermined computation method formation result of calculation; Further, the computational methods include, deviation voltage calculating, deviation temperature rise calculating, deviation bath resistance and deviation electrification Learn resistance calculations;
Wherein, the deviation voltage is calculated as:
Wherein, △ V are the deviation voltage, ViFor the voltage data of i-th of battery core,For average voltage;V is voltage threshold Value;I is positive integer.
Wherein, the deviation temperature rise is calculated as:
Wherein, △ T are the deviation temperature rise, TiFor the temperature rise data of i-th of battery core,For average temperature rising;T is temperature rise threshold Value;
Wherein, the deviation bath resistance is calculated as:
Wherein, △ R1iFor the deviation bath resistance, R1iFor the bath resistance of i-th of battery core,For average electrolysis Liquid resistance;R1For bath resistance threshold value;
Wherein, the deviation electrochemistry resistance calculations are:
Wherein, △ R2iFor the deviation electrochemistry resistance, R2iFor the electrochemistry resistance of i-th of battery core,For average electrification Learn resistance;R2For electrochemistry resistance threshold.
Wherein, voltage threshold V, temperature rise threshold value T-shaped into method have a variety of, for example can be according to history data analysis meter Calculate and formed, is not specifically limited herein, similarly bath resistance threshold value R1, electrochemistry resistance threshold R2It can be integrated by measured value Assess and formed, is not specifically described herein.
Step S140, the judged result according to result of calculation formation corresponding to each battery core are exported.It is described to calculate knot Fruit includes the deviation voltage, the deviation temperature rise, the deviation bath resistance and the deviation electrochemistry resistance, described Deviation voltage, the deviation temperature rise, the deviation bath resistance and the deviation electrochemistry resistance are not less than zero state Under, the judged result is qualified.I.e. in the deviation voltage, the deviation temperature rise, the deviation bath resistance and described Among deviation electrochemistry resistance, there is any one result of calculation to be more than zero, then judged result is unqualified.
A kind of measuring method of above-mentioned power lithium cell electric core, its operation principle is:Obtain first in dynamic lithium battery Each battery core charge and discharge cycles during voltage data and temperature rise data, then detect that the dynamic lithium battery is each described The electrolyte internal resistance of battery core, electrochemistry resistance;According to the voltage data, temperature rise data, electrolyte internal resistance, electrochemistry resistance junction Close predetermined computation method and form the deviation voltage, the deviation temperature rise, the deviation bath resistance and deviation electrification Learn resistance;It is small in the deviation voltage, the deviation temperature rise, the deviation bath resistance and the deviation electrochemistry resistance In the state of zero, then the battery core is judged for qualified battery core, it is on the contrary then judge the battery core for unqualified battery core.
Utilize the electrolysis of the voltage data and temperature rise data during each battery core charge and discharge cycles and each battery core Liquid internal resistance, electrochemistry resistance, which calculate, forms a judged result, judges whether battery core is qualified by the judged result, the present invention In, without individually being dismantled to battery core, it is to avoid damage is caused in unloading process to battery core, while also reducing whole inspection indirectly The survey time, secondly, it is necessary to which bath resistance, electrochemistry resistance to battery core detect that detection time is short, finally according to electrolysis Liquid internal resistance, electrochemistry internal resistance, temperature rise data and voltage data are the health status that can determine whether battery core, without carrying out complicated interior spy Property detection, detection efficiency is substantially increased, while also reducing testing cost.
As further preferred embodiment, the measuring method of above-mentioned power lithium cell electric core, wherein, the average electricity The computational methods of pressure are:
Wherein, n is the sum of the battery core, wherein, i≤n.
The computational methods of the average temperature rising are:
The computational methods of the bath resistance are:
The computational methods of the electrochemistry resistance are:
Embodiment two
It is complete by this, it is necessary to implement to dynamic lithium battery once during complete charge and discharge cycles in embodiment one Charge and discharge cycles are to obtain voltage data and temperature rise data, and generally complete charge and discharge cycles process is time-consuming longer, in order to further The efficiency of dynamic lithium battery battery measurement is provided.The present invention provides a kind of measuring method of power lithium cell electric core again, specifically,
As shown in Fig. 2 the present invention is providing a kind of measuring method of power lithium cell electric core, specifically include:
Step S210, read in battery management system it is every during the last charge and discharge cycles of the dynamic lithium battery The voltage data and temperature rise data of individual battery core;
Step S220, each battery core of the detection dynamic lithium battery internal resistance;
Step S230, according to the voltage data, temperature rise data, internal resistance combination predetermined computation method formation result of calculation;
Step S240, the judged result according to result of calculation formation corresponding to each battery core are exported.
In above-mentioned technical proposal, by means of the storage or memory function of battery management system to read in battery management system The voltage data and temperature rise data of each battery core during the last charge and discharge cycles of the dynamic lithium battery of storage;Need not Individually implement once complete charge and discharge process, further reduce the time of measuring of power lithium cell electric core.
Embodiment three
The present invention provides a kind of measuring system of power lithium cell electric core again, wherein, including,
Reading unit, for obtaining voltage data and temperature during each battery core charge and discharge cycles in dynamic lithium battery Rise data;
Detection unit, the internal resistance for detecting each battery core of the dynamic lithium battery;
Computing unit, for calculating knot according to the voltage data, temperature rise data, the formation of internal resistance combination predetermined computation method Really;
Judging unit, is exported for the judged result according to result of calculation formation corresponding to each battery core.
A kind of measuring system of above-mentioned power lithium cell electric core, its operation principle is with implementing the power lithium cell electric in one The measuring method operation principle of core is identical, does not repeat herein.
Although various aspects of the invention are provided in the independent claim, the other side of the present invention includes coming from The combination of the dependent claims of the feature of described embodiment and/or feature with independent claims, and not only It is the combination clearly provided in claim.
Although it is to be noted here that the foregoing describing the example embodiment of the present invention, these descriptions are not It should be understood in a limiting sense.Will without departing from such as appended right on the contrary, several change and modifications can be carried out The scope of the present invention defined in asking.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art it is various it is obvious change, Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (9)

1. a kind of measuring method of power lithium cell electric core, it is characterised in that;Including,
Obtain dynamic lithium battery in each battery core charge and discharge cycles during voltage data and temperature rise data;
Detect the internal resistance of each battery core of the dynamic lithium battery;
According to the voltage data, temperature rise data, internal resistance combination predetermined computation method formation result of calculation;
Judged result according to result of calculation formation corresponding to each battery core is exported.
2. the measuring method of power lithium cell electric core according to claim 1, it is characterised in that obtain the power lithium battery The voltage data and temperature rise data of each battery core during the charge and discharge cycles of pond include:
The voltage of each battery core during the last charge and discharge cycles of the dynamic lithium battery is read in battery management system Data and temperature rise data.
3. the measuring method of power lithium cell electric core according to claim 1, it is characterised in that the detection power lithium battery The internal resistance of each battery core in pond, including:The resistance includes bath resistance, electrochemistry resistance;
Apply alternating current of the frequency not less than 1Khz to the dynamic lithium battery to form the electrolyte of each battery core to measure Resistance;
To the dynamic lithium battery apply frequency be less than 1hz alternating current with measure to be formed each battery core the electrochemistry electricity Resistance.
4. the measuring method of power lithium cell electric core according to claim 3, it is characterised in that the computational methods bag Include, deviation voltage calculating, deviation temperature rise calculating, deviation bath resistance and deviation electrochemistry resistance calculations;
Wherein, the deviation voltage is calculated as:
Wherein, △ V are the deviation voltage, ViFor the voltage data of i-th of battery core,For average voltage;V is voltage threshold;i For positive integer.
Wherein, the deviation temperature rise is calculated as:
Wherein, △ T are the deviation temperature rise, TiFor the temperature rise data of i-th of battery core,For average temperature rising;T is temperature rise threshold value;
Wherein, the deviation bath resistance is calculated as:
Wherein, △ R1iFor the deviation bath resistance, R1iFor the bath resistance of i-th of battery core,For average electrolyte electricity Resistance;R1For bath resistance threshold value;
Wherein, the deviation electrochemistry resistance calculations are:
Wherein, △ R2iFor the deviation electrochemistry resistance, R2iFor the electrochemistry resistance of i-th of battery core,For average electrochemical electricity Resistance;R2For electrochemistry resistance threshold.
5. the measuring method of power lithium cell electric core according to claim 4, it is characterised in that according to the result of calculation The judged result formed corresponding to each battery core is exported;Wherein, the result of calculation includes the deviation voltage, the deviation temperature Rise, the deviation bath resistance and the deviation electrochemistry resistance, the deviation voltage, the deviation temperature rise, it is described partially Poor bath resistance and the deviation electrochemistry resistance are respectively less than in the state of zero, and the judged result is qualified.
6. the measuring method of power lithium cell electric core according to claim 4, it is characterised in that the meter of the average voltage Calculation method is:
Wherein, n is the sum of the battery core, wherein, i≤n.
7. the measuring method of power lithium cell electric core according to claim 4, it is characterised in that the meter of the average temperature rising Calculation method is:
8. the measuring method of power lithium cell electric core according to claim 4, it is characterised in that the bath resistance Computational methods are:
9. the measuring method of power lithium cell electric core according to claim 4, it is characterised in that the electrochemistry resistance Computational methods are:
CN201611030656.3A 2016-11-16 2016-11-16 A kind of measuring method of power lithium cell electric core CN107037365A (en)

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