CN107085187B - Echelon utilizes the determination method and device of battery energy storage system consistency maintenance index - Google Patents

Echelon utilizes the determination method and device of battery energy storage system consistency maintenance index Download PDF

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CN107085187B
CN107085187B CN201710238956.9A CN201710238956A CN107085187B CN 107085187 B CN107085187 B CN 107085187B CN 201710238956 A CN201710238956 A CN 201710238956A CN 107085187 B CN107085187 B CN 107085187B
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tested
battery modules
residual capacity
battery
index
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CN107085187A (en
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李娜
白恺
董建明
王开让
巩宇
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
Jibei Electric Power Research Institute
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
Jibei Electric Power Research Institute
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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]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • 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]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements

Abstract

The present invention provides the determination method and devices that echelon utilizes battery energy storage system consistency maintenance index, are related to echelon and utilize battery technology field.Method includes: that sampling obtains battery modules to be tested and carries out multiple charge and discharge test to it, and record operating parameter according to pre-set operating condition of test;After every charge and discharge test for carrying out a preset times, determine the residual capacity of battery modules to be tested, and each index of each single battery in battery modules to be tested is determined according to operating parameter, determine very poor each index of battery modules to be tested, mean square deviation and dispersion parameter;Determine the residual capacity and the very poor related coefficient of each index, the residual capacity of the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or battery modules to be tested and the related coefficient of each index dispersion of battery modules to be tested;To determine the consistency maintenance index of battery modules to be tested according to these related coefficients.

Description

Echelon utilizes the determination method and device of battery energy storage system consistency maintenance index
Technical field
The present invention relates to echelons to utilize battery energy storage system consistency using battery technology field more particularly to a kind of echelon Safeguard the determination method and device of index.
Background technique
Currently, the continuous concern with the exhaustive exploitation of petroleum resources and people to environment and new energy, electric car Certain status is occupied in Vehicles Collected from Market.Electric car converts the electric energy in battery to the kinetic energy of automobile, for The various movements of electric car.When battery capacity drops to 80% or less, it is generally recognized that be no longer appropriate on electric car after It is continuous to use.At this point, will cause the waste of resource if directly eliminated battery.Currently, in order to avoid the feelings of this wasting of resources Condition occurs, and echelon utilizes the effective means for being reduction battery totle drilling cost using the echelon of the power battery in battery energy storage power station. Future flourishes with new-energy automobile, it is contemplated that only Chinese can reach using the total electricity of secondary cell in the year two thousand thirty 50GWh。
Currently, echelon can be used for the energy-storage system of power grid occasion using battery energy storage power station, use condition is relatively milder, It is relatively low to battery performance requirements, it can be achieved that the echelon of power battery utilizes.It is utilized in battery energy storage power station in echelon, generally It is worked using the echelon being made of a large amount of battery modules using battery energy storage system, each battery modules include multiple lists The series connection of body battery.Due to the driving cycle of current electric car, maintenance situation difference it is larger, it is retired after battery performance it is irregular Uneven, battery is retired to stored energy application from electric car, is also faced with many technical problems.Such as battery consistency divergence speed Fastly, lead to the reduction of energy-accumulating power station active volume, be unable to satisfy out force request.As it can be seen that current echelon utilizes battery energy storage system one The diverging of cause property is to lead to the major reason of its inducing capacity fading, however the index for characterizing coherency state has very much, however in echelon Using in battery energy storage power station, the consistency maintenance of battery energy storage system is also immature, is also difficult to accurately determine to battery energy storage The relevant maintenance index of system conformance.
Summary of the invention
The embodiment of the present invention provide a kind of echelon using the determination method of battery energy storage system consistency maintenance index and Device, to solve the problems, such as that the prior art is also difficult to accurately determine maintenance index relevant to battery energy storage system consistency.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of echelon utilizes the determination method of battery energy storage system consistency maintenance index, comprising:
It is sampled in the retired battery modules of same production batch, obtains battery modules to be tested;It is described same The retired battery modules of production batch are Mission Number having the same, and production material and the identical battery modules of technique; The battery modules to be tested include the single battery of multiple series connections;
According to pre-set operating condition of test, multiple charge and discharge test is carried out to the battery modules to be tested, and record Operating parameter of each single battery during charge and discharge test;
After every charge and discharge test for carrying out a preset times, the residual capacity of the battery modules to be tested is determined;
When determining the residual capacity of the battery modules to be tested every time, electricity to be tested is determined according to the operating parameter The charge cutoff voltage of each single battery, discharge cut-off voltage, 100%SOC point open-circuit voltage and 0%SOC point are opened in Chi Mo group Road voltage, and determine the very poor parameter of each index, each index mean squared error parameter and each index dispersion ginseng of battery modules to be tested Number;The very poor parameter of each index includes that charge cutoff voltage is very poor, discharge cut-off voltage is very poor, 100%SOC point open-circuit voltage Very poor and 0%SOC point open-circuit voltage is very poor;Each index mean squared error parameter includes charge cutoff voltage mean square deviation, electric discharge section Only voltage mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage mean square deviation;Each index is discrete Spending parameter includes charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC point open-circuit voltage dispersion and 0% SOC point open-circuit voltage dispersion;
The residual capacity and the corresponding each very poor ginseng of index of each residual capacity of the battery modules to be tested determined according to each time Several, each index mean squared error parameter and each index dispersion parameter determine the residual capacity and each index of battery modules to be tested The residual capacity of very poor related coefficient, battery modules to be tested and the related coefficient or battery to be tested of each index mean square deviation The related coefficient of the residual capacity of mould group and each index dispersion;
According to the residual capacity of battery modules to be tested and the very poor related coefficient of each index, battery modules to be tested it is surplus The phase of covolume amount and the related coefficient of each index mean square deviation or the residual capacity of battery modules to be tested and each index dispersion Relationship number determines the consistency maintenance index of battery modules to be tested.
Specifically, multiple charge and discharge test is carried out to the battery modules to be tested according to pre-set operating condition of test, And record operating parameter of each single battery during charge and discharge test, comprising:
Multiple charge and discharge test is carried out to the battery modules to be tested with pre-set charge-discharge magnification, so as to be measured Examination battery modules complete charge and discharge process in pre-set state-of-charge SOC operation interval;
Record voltage data of each single battery during charge and discharge test.
Specifically, determining the residue of the battery modules to be tested after every charge and discharge test for carrying out a preset times Capacity, comprising:
After every charge and discharge test for carrying out a preset times, full be full of is carried out repeatedly to battery modules to be tested and puts circulation Test;
Seek every time the full average value full of the discharge capacity for putting cyclic test, using the average value of the discharge capacity as The residual capacity of this battery modules to be tested.
Specifically, determine the very poor parameter of each index, each index mean squared error parameter and each index of battery modules to be tested from Divergence parameter, comprising:
According to formula: ω=max xi-min xiDetermine the very poor parameter ω of each index of battery modules to be tested;Work as index When very poor parameter is that charge cutoff voltage is very poor, max xiIndicate the charge cutoff electricity of each single battery in battery modules to be tested The maximum value of pressure, min xiIndicate the minimum value of the charge cutoff voltage of each single battery in battery modules to be tested;Work as index When very poor parameter is that discharge cut-off voltage is very poor, max xiIndicate the electric discharge cut-off electricity of each single battery in battery modules to be tested The maximum value of pressure, min xiIndicate the minimum value of the discharge cut-off voltage of each single battery in battery modules to be tested;Work as index When very poor parameter is that 100%SOC point open-circuit voltage is very poor, max xiIndicate each single battery in battery modules to be tested The maximum value of 100%SOC point open-circuit voltage, min xiIndicate that the 100%SOC point of each single battery in battery modules to be tested is opened The minimum value of road voltage;When the very poor parameter of index is that 0%SOC point open-circuit voltage is very poor, max xiIndicate battery mould to be tested The maximum value of the 0%SOC point open-circuit voltage of each single battery, min x in groupiIndicate each single battery in battery modules to be tested 0%SOC point open-circuit voltage minimum value.
Further, the very poor parameter of each index, each index mean squared error parameter and each index of battery modules to be tested are determined Dispersion parameter, further includes:
According to formula:Determine each index mean squared error parameter σ of battery modules to be tested;N be to Test the quantity of single battery in battery modules;When index mean squared error parameter is charge cutoff voltage mean square deviation, xiIt is to be measured The charge cutoff voltage of i-th of single battery in battery modules is tried, μ is that the charging of each single battery in battery modules to be tested is cut The only average value of voltage;When index mean squared error parameter is discharge cut-off voltage mean square deviation, xiIt is in battery modules to be tested i-th The discharge cut-off voltage of a single battery, μ are the average value of the discharge cut-off voltage of each single battery in battery modules to be tested; When index mean squared error parameter is 100%SOC point open-circuit voltage mean square deviation, xiFor i-th of monomer electricity in battery modules to be tested The 100%SOC point open-circuit voltage in pond, μ are the flat of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested Mean value;When index mean squared error parameter is 0%SOC point open-circuit voltage mean square deviation, xiFor i-th of monomer in battery modules to be tested The 0%SOC point open-circuit voltage of battery, μ are that the 0%SOC point open-circuit voltage of each single battery in battery modules to be tested is averaged Value.
Further, the very poor parameter of each index, each index mean squared error parameter and each index of battery modules to be tested are determined Dispersion parameter, further includes:
According to formula: ε=(Ei- E)/E determines each index dispersion parameter ε of battery modules to be tested;When index is discrete When degree parameter is charge cutoff voltage dispersion, EiFor the charge cutoff voltage of i-th of single battery in battery modules to be tested, E is the average value of the charge cutoff voltage of each single battery in battery modules to be tested;When index dispersion parameter is that electric discharge is cut When only voltage dispersion is spent, EiFor the discharge cut-off voltage of i-th of single battery in battery modules to be tested, E is battery to be tested The average value of the discharge cut-off voltage of each single battery in mould group;When index dispersion parameter be 100%SOC point open-circuit voltage from When divergence, EiFor the 100%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is battery mould to be tested The average value of the 100%SOC point open-circuit voltage of each single battery in group;When index dispersion parameter is 0%SOC point open-circuit voltage When dispersion, EiFor the 0%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is battery mould to be tested The average value of the 0%SOC point open-circuit voltage of each single battery in group.
Specifically, the residual capacity and the corresponding each finger of each residual capacity of the battery modules to be tested determined according to each time Very poor parameter, each index mean squared error parameter and each index dispersion parameter are marked, determines the residual capacity of battery modules to be tested With each index very poor related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or to Test the residual capacity of battery modules and the related coefficient of each index dispersion, comprising:
According to formula:Determine the residual capacity of battery modules to be tested and each The very poor related coefficient of index, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or to be tested The related coefficient of the residual capacity of battery modules and each index dispersion;M is the residual capacity for determining battery modules to be tested Number;J indicates the jth time in the residual capacity of M determination battery modules to be tested;YjThe battery to be tested determined for jth time The residual capacity of mould group;The average value of the residual capacity of battery modules to be tested is determined for M times;0≤R≤1;
Wherein, when R is for indicating the residual capacity of battery modules to be tested and the very poor related coefficient of charge cutoff voltage When, XjDetermine that the corresponding charge cutoff voltage of residual capacity of battery modules to be tested is very poor for jth time,For each time determine to Test the very poor average value of the corresponding charge cutoff voltage of residual capacity of battery modules;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with discharge cut-off voltage, Xj Determine that the corresponding discharge cut-off voltage of residual capacity of battery modules to be tested is very poor for jth time,It is to be tested for each determination The very poor average value of the corresponding discharge cut-off voltage of the residual capacity of battery modules;
When R is used to indicate the residual capacity and the very poor related coefficient of 100%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 100%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,It is each time Determine the very poor average value of the corresponding 100%SOC point open-circuit voltage of the residual capacity of battery modules to be tested;
When R is used to indicate the residual capacity and the very poor related coefficient of 0%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,Really for each time The very poor average value of the corresponding 0%SOC point open-circuit voltage of residual capacity of fixed battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage mean square deviation of battery modules to be tested, XjThe corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage mean square deviation of battery modules to be tested, XjThe corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules;
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage mean square deviation of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage mean square deviation of the residual capacity of each determination battery modules to be tested;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage mean square deviation as R When, XjThe corresponding 0%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage mean square deviation of the residual capacity of battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage dispersion of battery modules to be tested, XjThe corresponding charge cutoff voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage dispersion of residual capacity of battery modules;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage dispersion of battery modules to be tested, XjThe corresponding discharge cut-off voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage dispersion of residual capacity of battery modules;
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage dispersion of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage dispersion of the residual capacity of each determination battery modules to be tested;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage dispersion as R When, XjThe corresponding 0%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage dispersion of the residual capacity of battery modules to be tested.
Specifically, according to the residual capacity of battery modules to be tested and the very poor related coefficient of each index, battery to be tested The related coefficient of the residual capacity of mould group and each index mean square deviation or the residual capacity of battery modules to be tested and each index from The related coefficient of divergence determines the consistency maintenance index of battery modules to be tested, comprising:
Determine the residual capacity of battery modules to be tested and the maximum value of the very poor related coefficient of each index, and by the phase The corresponding index of the maximum value of relationship number is determined as the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index dispersion, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
A kind of echelon utilizes the determining device of battery energy storage system consistency maintenance index, comprising:
Sampling unit obtains battery to be tested for being sampled in the retired battery modules of same production batch Mould group;The retired battery modules of the same production batch are Mission Number having the same, and production material and technique phase Same battery modules;The battery modules to be tested include the single battery of multiple series connections;
Charge and discharge test unit, for being carried out to the battery modules to be tested more according to pre-set operating condition of test Secondary charge and discharge test, and record operating parameter of each single battery during charge and discharge test;
Residual capacity determination unit, for determining described to be tested after every charge and discharge test for carrying out a preset times The residual capacity of battery modules;
Parameter determination unit, for when determining the residual capacity of the battery modules to be tested every time, according to the fortune Row parameter determines that the charge cutoff voltage of each single battery in battery modules to be tested, discharge cut-off voltage, 100%SOC point are opened Road voltage and 0%SOC point open-circuit voltage, and determine the very poor parameter of each index of battery modules to be tested, each index mean square deviation ginseng Several and each index dispersion parameter;The very poor parameter of each index include charge cutoff voltage is very poor, discharge cut-off voltage is very poor, 100%SOC point open-circuit voltage is very poor and 0%SOC point open-circuit voltage is very poor;Each index mean squared error parameter includes charge cutoff Voltage mean square deviation, discharge cut-off voltage mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage are square Difference;Each index dispersion parameter includes that charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC point are opened Road voltage dispersion degree and 0%SOC point open-circuit voltage dispersion;
Related coefficient determination unit, the residual capacity and each residue of the battery modules to be tested for being determined according to each time The very poor parameter of the corresponding each index of capacity, each index mean squared error parameter and each index dispersion parameter, determine battery to be tested Residual capacity and each index mean square deviation of the residual capacity of mould group and the very poor related coefficient of each index, battery modules to be tested The related coefficient of the residual capacity of related coefficient or battery modules to be tested and each index dispersion;
Consistency maintenance index determination unit, for very poor according to the residual capacity of battery modules to be tested and each index Related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or battery modules to be tested The related coefficient of residual capacity and each index dispersion determines the consistency maintenance index of battery modules to be tested.
Specifically, the charge and discharge test unit, comprising:
Charge and discharge test module, it is multiple for being carried out with pre-set charge-discharge magnification to the battery modules to be tested Charge and discharge test, so that battery modules to be tested complete charge and discharge process in pre-set state-of-charge SOC operation interval;
Voltage data logging modle, for recording voltage data of each single battery during charge and discharge test.
Specifically, the residual capacity determination unit, comprising:
It is full full of putting cyclic test module, for after every charge and discharge test for carrying out a preset times, to electricity to be tested Chi Mo group carries out repeatedly full be full of and puts cyclic test;
Discharge capacity average value determining module, for seeking every time full being averaged full of the discharge capacity for putting cyclic test Value, using the average value of the discharge capacity as the residual capacity of this battery modules to be tested.
In addition, the parameter determination unit is specifically used for:
According to formula: ω=max xi-min xiDetermine the very poor parameter ω of each index of battery modules to be tested;Work as index When very poor parameter is that charge cutoff voltage is very poor, max xiIndicate the charge cutoff electricity of each single battery in battery modules to be tested The maximum value of pressure, min xiIndicate the minimum value of the charge cutoff voltage of each single battery in battery modules to be tested;Work as index When very poor parameter is that discharge cut-off voltage is very poor, max xiIndicate the electric discharge cut-off electricity of each single battery in battery modules to be tested The maximum value of pressure, min xiIndicate the minimum value of the discharge cut-off voltage of each single battery in battery modules to be tested;Work as index When very poor parameter is that 100%SOC point open-circuit voltage is very poor, max xiIndicate each single battery in battery modules to be tested The maximum value of 100%SOC point open-circuit voltage, min xiIndicate that the 100%SOC point of each single battery in battery modules to be tested is opened The minimum value of road voltage;When the very poor parameter of index is that 0%SOC point open-circuit voltage is very poor, max xiIndicate battery mould to be tested The maximum value of the 0%SOC point open-circuit voltage of each single battery, min x in groupiIndicate each single battery in battery modules to be tested 0%SOC point open-circuit voltage minimum value.
In addition, the parameter determination unit is specifically also used to:
According to formula:Determine each index mean squared error parameter σ of battery modules to be tested;N be to Test the quantity of single battery in battery modules;When index mean squared error parameter is charge cutoff voltage mean square deviation, xiIt is to be measured The charge cutoff voltage of i-th of single battery in battery modules is tried, μ is that the charging of each single battery in battery modules to be tested is cut The only average value of voltage;When index mean squared error parameter is discharge cut-off voltage mean square deviation, xiIt is in battery modules to be tested i-th The discharge cut-off voltage of a single battery, μ are the average value of the discharge cut-off voltage of each single battery in battery modules to be tested; When index mean squared error parameter is 100%SOC point open-circuit voltage mean square deviation, xiFor i-th of monomer electricity in battery modules to be tested The 100%SOC point open-circuit voltage in pond, μ are the flat of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested Mean value;When index mean squared error parameter is 0%SOC point open-circuit voltage mean square deviation, xiFor i-th of monomer in battery modules to be tested The 0%SOC point open-circuit voltage of battery, μ are that the 0%SOC point open-circuit voltage of each single battery in battery modules to be tested is averaged Value.
In addition, the parameter determination unit is specifically also used to:
According to formula: ε=(Ei- E)/E determines each index dispersion parameter ε of battery modules to be tested;When index is discrete When degree parameter is charge cutoff voltage dispersion, EiFor the charge cutoff voltage of i-th of single battery in battery modules to be tested, E is the average value of the charge cutoff voltage of each single battery in battery modules to be tested;When index dispersion parameter is that electric discharge is cut When only voltage dispersion is spent, EiFor the discharge cut-off voltage of i-th of single battery in battery modules to be tested, E is battery to be tested The average value of the discharge cut-off voltage of each single battery in mould group;When index dispersion parameter be 100%SOC point open-circuit voltage from When divergence, EiFor the 100%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is battery mould to be tested The average value of the 100%SOC point open-circuit voltage of each single battery in group;When index dispersion parameter is 0%SOC point open-circuit voltage When dispersion, EiFor the 0%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is battery mould to be tested The average value of the 0%SOC point open-circuit voltage of each single battery in group.
In addition, the related coefficient determination unit, is specifically used for:
According to formula:Determine the residual capacity of battery modules to be tested and each The very poor related coefficient of index, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or to be tested The related coefficient of the residual capacity of battery modules and each index dispersion;M is the residual capacity for determining battery modules to be tested Number;J indicates the jth time in the residual capacity of M determination battery modules to be tested;YjThe battery to be tested determined for jth time The residual capacity of mould group;The average value of the residual capacity of battery modules to be tested is determined for M times;0≤R≤1;
Wherein, when R is for indicating the residual capacity of battery modules to be tested and the very poor related coefficient of charge cutoff voltage When, XjDetermine that the corresponding charge cutoff voltage of residual capacity of battery modules to be tested is very poor for jth time,For each time determine to Test the very poor average value of the corresponding charge cutoff voltage of residual capacity of battery modules;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with discharge cut-off voltage, Xj Determine that the corresponding discharge cut-off voltage of residual capacity of battery modules to be tested is very poor for jth time,It is to be tested for each determination The very poor average value of the corresponding discharge cut-off voltage of the residual capacity of battery modules;
When R is used to indicate the residual capacity and the very poor related coefficient of 100%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 100%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,It is each time Determine the very poor average value of the corresponding 100%SOC point open-circuit voltage of the residual capacity of battery modules to be tested;
When R is used to indicate the residual capacity and the very poor related coefficient of 0%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,Really for each time The very poor average value of the corresponding 0%SOC point open-circuit voltage of residual capacity of fixed battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage mean square deviation of battery modules to be tested, XjThe corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage mean square deviation of battery modules to be tested, XjThe corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules;
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage mean square deviation of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage mean square deviation of the residual capacity of each determination battery modules to be tested;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage mean square deviation as R When, XjThe corresponding 0%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage mean square deviation of the residual capacity of battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage dispersion of battery modules to be tested, XjThe corresponding charge cutoff voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage dispersion of residual capacity of battery modules;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage dispersion of battery modules to be tested, XjThe corresponding discharge cut-off voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage dispersion of residual capacity of battery modules;
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage dispersion of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage dispersion of the residual capacity of each determination battery modules to be tested;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage dispersion as R When, XjThe corresponding 0%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage dispersion of the residual capacity of battery modules to be tested.
In addition, the consistency maintenance index determination unit, is specifically used for:
Determine the residual capacity of battery modules to be tested and the maximum value of the very poor related coefficient of each index, and by the phase The corresponding index of the maximum value of relationship number is determined as the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index dispersion, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
A kind of echelon provided in an embodiment of the present invention using battery energy storage system consistency maintenance index determination method and Device is sampled in the retired battery modules of same production batch first, obtains battery modules to be tested;Basis later Pre-set operating condition of test carries out multiple charge and discharge test to the battery modules to be tested;In one preset times of every progress Charge and discharge test after, determine the residual capacity of the battery modules to be tested;Later, the battery to be tested determined according to each time The residual capacity of mould group and the corresponding each index of each residual capacity (charge cutoff of each single battery in battery modules to be tested Voltage, discharge cut-off voltage, 100%SOC point open-circuit voltage and 0%SOC point open-circuit voltage) very poor parameter, each index mean square deviation Parameter and each index dispersion parameter, determine battery modules to be tested residual capacity and the very poor related coefficient of each index, The residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or the residual capacity of battery modules to be tested With the related coefficient of each index dispersion;Finally determine the consistency maintenance index of battery modules to be tested.The present invention can solve Certainly the prior art is also difficult to the problem of accurately determining maintenance index relevant to battery energy storage system consistency, subsequent with a batch When secondary retired battery modules are safeguarded, the consistency maintenance index of battery modules to be tested can be directly paid close attention to, is reduced Echelon utilizes the maintenance workload of battery energy storage power station, improves maintenance efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.
Fig. 1 is the determination side that a kind of echelon provided in an embodiment of the present invention utilizes battery energy storage system consistency maintenance index The flow chart one of method;
Fig. 2 is the determination side that a kind of echelon provided in an embodiment of the present invention utilizes battery energy storage system consistency maintenance index The flowchart 2 of method;
Fig. 3 tests charge and discharge process monomer voltage and 8 lists in initial capacity for 8 battery cells in the embodiment of the present invention Bulk voltage Change in Mean schematic diagram;
Fig. 4 is that 8 battery cells are opened in the open-circuit voltage of 100%SOC point and 0%SOC point and 8 in the embodiment of the present invention The average value schematic diagram of road voltage;
Fig. 5 is the very poor schematic diagram of charge and discharge blanking voltage of 8 battery cell difference cycle-indexes in the embodiment of the present invention;
Fig. 6 is that the charging/discharging voltage of 2-4 battery cell difference cycle-index and series connection monomer are flat in the embodiment of the present invention Equal V diagram;
Fig. 7 is that the correlation curve of charge cutoff voltage dispersion and battery modules capacity is illustrated in the embodiment of the present invention Figure;
Fig. 8 is that the correlation curve of discharge cut-off voltage dispersion and battery modules capacity is illustrated in the embodiment of the present invention Figure;
Fig. 9 is the correlation curve schematic diagram of 0%OCV dispersion and battery modules capacity in the embodiment of the present invention;
Figure 10 is the very poor correlation curve schematic diagram with battery modules capacity of charge cutoff voltage in the embodiment of the present invention;
Figure 11 is the very poor correlation curve schematic diagram with battery modules capacity of discharge cut-off voltage in the embodiment of the present invention;
Figure 12 is the determination that a kind of echelon provided in an embodiment of the present invention utilizes battery energy storage system consistency maintenance index The structural schematic diagram one of device;
Figure 13 is the determination that a kind of echelon provided in an embodiment of the present invention utilizes battery energy storage system consistency maintenance index The structural schematic diagram two of device.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of echelon using battery energy storage system consistency maintenance index really Determine method, comprising:
Step 101 is sampled in the retired battery modules of same production batch, obtains battery modules to be tested.
Herein, the retired battery modules of the same production batch are Mission Number having the same, and production material Battery modules identical with technique;The battery modules to be tested include the single battery of multiple series connections.
Step 102, according to pre-set operating condition of test, multiple charge and discharge examination is carried out to the battery modules to be tested It tests, and records operating parameter of each single battery during charge and discharge test.
Step 103, it is every carry out a preset times charge and discharge test after, determine the residue of the battery modules to be tested Capacity.
Step 104, when determining the residual capacity of the battery modules to be tested every time, according to the operating parameter determine The charge cutoff voltage of each single battery, discharge cut-off voltage, 100%SOC point open-circuit voltage and 0% in battery modules to be tested SOC point open-circuit voltage, and determine the very poor parameter of each index, each index mean squared error parameter and each index of battery modules to be tested from Divergence parameter.
Specifically, the very poor parameter of each index includes, charge cutoff voltage is very poor, discharge cut-off voltage is very poor, 100% SOC point open-circuit voltage is very poor and 0%SOC point open-circuit voltage is very poor;Each index mean squared error parameter includes charge cutoff voltage Mean square deviation, discharge cut-off voltage mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage mean square deviation;Institute Stating each index dispersion parameter includes charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC point open circuit electricity Press dispersion and 0%SOC point open-circuit voltage dispersion.
The residual capacity and the corresponding each finger of each residual capacity of step 105, the battery modules to be tested determined according to each time Very poor parameter, each index mean squared error parameter and each index dispersion parameter are marked, determines the residual capacity of battery modules to be tested With each index very poor related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or to Test the residual capacity of battery modules and the related coefficient of each index dispersion.
Step 106, residual capacity and the very poor related coefficient of each index, battery to be tested according to battery modules to be tested The related coefficient of the residual capacity of mould group and each index mean square deviation or the residual capacity of battery modules to be tested and each index from The related coefficient of divergence determines the consistency maintenance index of battery modules to be tested.
A kind of echelon provided in an embodiment of the present invention utilizes the determination method of battery energy storage system consistency maintenance index, first It is first sampled in the retired battery modules of same production batch, obtains battery modules to be tested;Basis is set in advance later The operating condition of test set carries out multiple charge and discharge test to the battery modules to be tested;In every charge and discharge for carrying out a preset times After electric test, the residual capacity of the battery modules to be tested is determined;Later, the battery modules to be tested determined according to each time (charge cutoff voltage of each single battery in battery modules to be tested is put for residual capacity and the corresponding each index of each residual capacity Electric blanking voltage, 100%SOC point open-circuit voltage and 0%SOC point open-circuit voltage) very poor parameter, each index mean squared error parameter and Each index dispersion parameter determines the residual capacity and the very poor related coefficient of each index, electricity to be tested of battery modules to be tested The residual capacity and each index of the related coefficient or battery modules to be tested of the residual capacity of Chi Mo group and each index mean square deviation The related coefficient of dispersion;Finally determine the consistency maintenance index of battery modules to be tested.The present invention can solve existing skill Art is also difficult to the problem of accurately determining maintenance index relevant to battery energy storage system consistency, has moved back subsequent with a batch of When labour battery modules are safeguarded, the consistency maintenance index of battery modules to be tested can be directly paid close attention to, echelon is reduced and utilizes The maintenance workload of battery energy storage power station improves maintenance efficiency.
In order to make those skilled in the art be better understood by the present invention, a more detailed embodiment is set forth below, As shown in Fig. 2, the embodiment of the present invention provides the determination method packet that a kind of echelon utilizes battery energy storage system consistency maintenance index It includes:
Step 201 is sampled in the retired battery modules of same production batch, obtains battery modules to be tested.
Herein, the retired battery modules of the same production batch are Mission Number having the same, and production material Battery modules identical with technique, such as certain Vehicules Electr Sas Soc D. is in a collection of model FP451502455 of production in 2015 Battery modules.The battery modules to be tested include the single battery of multiple series connections.
Step 202 carries out multiple charge and discharge test to the battery modules to be tested with pre-set charge-discharge magnification, So that battery modules to be tested complete charge and discharge process in pre-set state-of-charge SOC operation interval.
For example, the charge-discharge magnification can be less than 0.5C, pre-set state-of-charge (State of Charge, letter SOC) operation interval can be referred to as 10% to 90%.
The multiple charge and discharge test for example can be 100 times, but be not only limited to this.
Step 203 records voltage data of each single battery during charge and discharge test.
The voltage data may include charge cutoff voltage, discharge cut-off voltage, the 100%SOC point of each single battery Open-circuit voltage and 0%SOC point open-circuit voltage.
Step 204, it is every carry out a preset times charge and discharge test after, to battery modules to be tested progress repeatedly completely fill Completely put cyclic test.
Multiple herein can be completely 3 times full of cyclic test is put, but be not only limited to this.
Step 205 seeks every time the full average value full of the discharge capacity for putting cyclic test, with the flat of the discharge capacity Residual capacity of the mean value as this battery modules to be tested.
Step 206, when determining the residual capacity of the battery modules to be tested every time, according to each single battery in charge and discharge Voltage data during electric test determines the charge cutoff voltage of each single battery in battery modules to be tested, electric discharge cut-off Voltage, 100%SOC point open-circuit voltage and 0%SOC point open-circuit voltage.
Step 207, the very poor parameter of each index for determining battery modules to be tested, each index mean squared error parameter and each index from Divergence parameter.
Specifically, the very poor parameter of each index includes, charge cutoff voltage is very poor, discharge cut-off voltage is very poor, 100% SOC point open-circuit voltage is very poor and 0%SOC point open-circuit voltage is very poor;Each index mean squared error parameter includes charge cutoff voltage Mean square deviation, discharge cut-off voltage mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage mean square deviation;Institute Stating each index dispersion parameter includes charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC point open circuit electricity Press dispersion and 0%SOC point open-circuit voltage dispersion.
Specifically, herein can be according to formula: ω=max xi-min xiDetermine each index pole of battery modules to be tested Poor parameter ω;When the very poor parameter of index is that charge cutoff voltage is very poor, max xiIndicate each monomer in battery modules to be tested The maximum value of the charge cutoff voltage of battery, min xiIndicate the charge cutoff voltage of each single battery in battery modules to be tested Minimum value;When the very poor parameter of index is that discharge cut-off voltage is very poor, max xiIndicate each monomer in battery modules to be tested The maximum value of the discharge cut-off voltage of battery, min xiIndicate the discharge cut-off voltage of each single battery in battery modules to be tested Minimum value;When the very poor parameter of index is that 100%SOC point open-circuit voltage is very poor, max xiIt indicates in battery modules to be tested The maximum value of the 100%SOC point open-circuit voltage of each single battery, min xiIndicate each single battery in battery modules to be tested The minimum value of 100%SOC point open-circuit voltage;When the very poor parameter of index is that 0%SOC point open-circuit voltage is very poor, max xiIt indicates The maximum value of the 0%SOC point open-circuit voltage of each single battery, min x in battery modules to be testediIndicate battery modules to be tested In each single battery 0%SOC point open-circuit voltage minimum value.
In addition, herein can be according to formula:Determine that each index of battery modules to be tested is square Poor parameter σ;N is the quantity of single battery in battery modules to be tested;When index mean squared error parameter is that charge cutoff voltage is square When poor, xiFor the charge cutoff voltage of i-th of single battery in battery modules to be tested, μ is each list in battery modules to be tested The average value of the charge cutoff voltage of body battery;When index mean squared error parameter is discharge cut-off voltage mean square deviation, xiIt is to be measured The discharge cut-off voltage of i-th of single battery in battery modules is tried, μ is that the electric discharge of each single battery in battery modules to be tested is cut The only average value of voltage;When index mean squared error parameter is 100%SOC point open-circuit voltage mean square deviation, xiFor battery mould to be tested The 100%SOC point open-circuit voltage of i-th of single battery in group, μ are the 100%SOC of each single battery in battery modules to be tested The average value of point open-circuit voltage;When index mean squared error parameter is 0%SOC point open-circuit voltage mean square deviation, xiFor battery to be tested The 0%SOC point open-circuit voltage of i-th of single battery in mould group, μ are the 0%SOC point of each single battery in battery modules to be tested The average value of open-circuit voltage.
In addition, herein can be according to formula: ε=(Ei- E)/E determines each index dispersion parameters of battery modules to be tested ε;When index dispersion parameter is charge cutoff voltage dispersion, EiFor i-th single battery in battery modules to be tested Charge cutoff voltage, E are the average value of the charge cutoff voltage of each single battery in battery modules to be tested;When index dispersion When parameter is discharge cut-off voltage dispersion, EiFor the discharge cut-off voltage of i-th of single battery in battery modules to be tested, E For the average value of the discharge cut-off voltage of each single battery in battery modules to be tested;When index dispersion parameter is 100%SOC When point open-circuit voltage dispersion, EiFor the 100%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is The average value of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested;When index dispersion parameter is 0% When SOC point open-circuit voltage dispersion, EiFor the 0%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is The average value of the 0%SOC point open-circuit voltage of each single battery in battery modules to be tested.
The residual capacity and the corresponding each finger of each residual capacity of step 208, the battery modules to be tested determined according to each time Very poor parameter, each index mean squared error parameter and each index dispersion parameter are marked, determines the residual capacity of battery modules to be tested With each index very poor related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or to Test the residual capacity of battery modules and the related coefficient of each index dispersion.
It herein, can be according to formula:Determine the surplus of battery modules to be tested The related coefficient of covolume amount and the very poor related coefficient of each index, the residual capacity of battery modules to be tested and each index mean square deviation Or the related coefficient of the residual capacity of battery modules to be tested and each index dispersion;M is to determine battery modules to be tested The number of residual capacity;J indicates the jth time in the residual capacity of M determination battery modules to be tested;YjIt is determined for jth time The residual capacity of battery modules to be tested;The average value of the residual capacity of battery modules to be tested is determined for M times;0≤R≤1.
Wherein, when R is for indicating the residual capacity of battery modules to be tested and the very poor related coefficient of charge cutoff voltage When, XjDetermine that the corresponding charge cutoff voltage of residual capacity of battery modules to be tested is very poor for jth time,For each time determine to Test the very poor average value of the corresponding charge cutoff voltage of residual capacity of battery modules.
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with discharge cut-off voltage, Xj Determine that the corresponding discharge cut-off voltage of residual capacity of battery modules to be tested is very poor for jth time,It is to be tested for each determination The very poor average value of the corresponding discharge cut-off voltage of the residual capacity of battery modules.
When R is used to indicate the residual capacity and the very poor related coefficient of 100%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 100%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,It is each time Determine the very poor average value of the corresponding 100%SOC point open-circuit voltage of the residual capacity of battery modules to be tested.
When R is used to indicate the residual capacity and the very poor related coefficient of 0%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time, X is true each time The very poor average value of the corresponding 0%SOC point open-circuit voltage of residual capacity of fixed battery modules to be tested.
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage mean square deviation of battery modules to be tested, XjThe corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules.
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage mean square deviation of battery modules to be tested, XjThe corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules.
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage mean square deviation of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage mean square deviation of the residual capacity of each determination battery modules to be tested.
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage mean square deviation as R When, XjThe corresponding 0%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage mean square deviation of the residual capacity of battery modules to be tested.
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage dispersion of battery modules to be tested, XjThe corresponding charge cutoff voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage dispersion of residual capacity of battery modules.
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage dispersion of battery modules to be tested, XjThe corresponding discharge cut-off voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage dispersion of residual capacity of battery modules.
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage dispersion of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage dispersion of the residual capacity of each determination battery modules to be tested.
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage dispersion as R When, XjThe corresponding 0%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage dispersion of the residual capacity of battery modules to be tested.
After step 208, following steps 209, step 210 or step 211 can be continued to execute.
The maximum value of step 209, the residual capacity for determining battery modules to be tested and the very poor related coefficient of each index, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
The maximum value of the related coefficient of step 210, the residual capacity for determining battery modules to be tested and each index mean square deviation, And the corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
The maximum value of the related coefficient of step 211, the residual capacity for determining battery modules to be tested and each index dispersion, And the corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
In order to enable those skilled in the art is better understood by above-mentioned steps 201 to step 211, below with reference to specific Trial curve figure lists a specific example:
In order to study the consistency problem of battery modules of the invention, 2 retired battery modules of electric car are chosen (respectively Labeled as 1# and 2#) it is used as test sample, this moves back fortune battery modules and is connected in series by 4 battery cells.By two electricity in test The series connection of Chi Mo group, studies the consistency of 8 battery cells (being respectively labeled as 1-1,1-2,1-3,1-4,2-1,2-2,2-3,2-4) Characteristic.
Charge and discharge process monomer voltage and 8 is tested in initial capacity as shown in figure 3, which show above-mentioned 8 battery cells A monomer voltage Change in Mean, it can be seen that 2-4 single battery reaches charge and discharge blanking voltage at first, and in entire charging process In all be higher than average voltage, in entire discharge process be below average voltage.Reach charge cutoff voltage in 2-4 monomer Monomer average voltage is only 3.49V when 3.65V, and the voltage of 1-1 single battery is 3.449V at this time;2-4 monomer reaches electric discharge Monomer average voltage is only 3V when blanking voltage 2.5V, and the voltage of 1-1 single battery is 3.147V at this time, if pressing battery modules Battery modules can also continue charge and discharge from the point of view of average voltage, and actually the battery modules cannot be re-filled with or release appearance Amount, influences the charge-discharge performance of battery modules.As shown in figure 4, which show 8 battery cells in 100%SOC point and 0%SOC The open-circuit voltage of point and average value (two dotted lines in Fig. 4 of 8 open-circuit voltages (Open Circuit Voltage, abbreviation OCV) It is shown), as can be seen from the figure 8 single battery OCV are fluctuated larger near mean value, illustrate the consistency of 8 single batteries It is poor.Fig. 5 is that the charge and discharge blanking voltage of 8 battery cell difference cycle-indexes is very poor, it can be seen that 1# and 2# battery modules Monomer of connecting is very poor increasing as cycle-index increases, and shows that the dispersion of single battery is increasing.
As shown in fig. 6, it is the voltage of the entire charge and discharge process of 2-4 single battery under different cycle-indexes and 8 The average voltage of series connection single battery, the increase from the point of view of the charge and discharge process of 2-4 single battery with cycle-index is in charge and discharge The time that electric end 2-4 single battery reaches blanking voltage is shorter and shorter, and the capacity for illustrating that battery modules can be filled with/release is got over It is deteriorated come more few consistency for also reflecting battery modules, while it can also be seen that 2-4 single battery blanking voltage and electricity in groups Average voltage difference when pond charge and discharge end is increasing, and the consistency of battery modules is also worse and worse.It can from Fig. 6 Out 8 series connection single battery charge and discharge blanking voltage very poor and mean square deviation with the increase of cycle-index it is increasing, The open-circuit voltage of 100%SOC point and 0%SOC point is also increasing, it can be seen that and the consistency of 8 pieces of single batteries is increasing, I.e. divergence is increasing.
Alternatively, it is also possible to describe individual monomers cell voltage and battery average voltage in battery modules with battery dispersion Inconsistency, shown in following formula (1).Z indicates the voltage dispersion degree of monomer in battery modules, Z in formulaiIndicate i-th of list The end voltage of body battery, Z indicate the average voltage of battery modules.
Z=(Zi-Z)/Z(1)
Calculate charge cutoff end voltage dispersion degree, the discharge cut-off voltage of each monomer in battery modules under different cycle-indexes Dispersion, 100%OCV dispersion and 0%OCV dispersion percentage.To 1#, 2# connects stack battery and one for control Change dispersion with cycle-index in charge cutoff voltage, discharge cut-off voltage, 100%OCV and 0%OCV in 4# battery modules The dispersion and being associated property of residual capacity of maximum single battery are analyzed, and to the charge and discharge electrode under different cycle-indexes Difference is analyzed with being associated property of residual capacity.Due to the dispersion for 100%OCV, it is not necessarily all under different cycle-indexes Same single battery dispersion is bigger, therefore this factor is not accounted for when analysis and residual capacity relevance, and Fig. 7 to Figure 11 points It is not to remaining 5 parameters (charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 0%OCV dispersions, charge cutoff Voltage is very poor, discharge cut-off voltage is very poor) correlation analysis has been carried out with battery modules capacity, it can be seen that charge cutoff voltage Dispersion and charge cutoff voltage are very poor stronger with the linear dependence of battery modules capacity, table 1 give the two parameters with The related coefficient of residual capacity linear dependence analysis.Herein, illustrate closer to 1 linear between higher i.e. two parameters of degree of fitting The degree of association is higher, it follows that for this group of battery sample, the very poor degree of correlation with residual capacity of charge cutoff voltage is most It greatly, in practical projects can be by judging in battery modules that charge cutoff voltage is very poor or charge cutoff voltage dispersion is sentenced Pond mould pool-size is powered off, wherein the very poor consistency that best embodies of charge cutoff voltage is to the influence degree of residual capacity, therefore selects It is very poor as consistency maintenance index to select charge cutoff voltage.
Battery is utilized for the echelon of other batches, it, can method according to the present invention when choosing consistency maintenance index It is tested and is calculated, it is final to determine applicable coincident indicator.
Table 1:
A kind of echelon provided in an embodiment of the present invention utilizes the determination method of battery energy storage system consistency maintenance index, first It is first sampled in the retired battery modules of same production batch, obtains battery modules to be tested;Basis is set in advance later The operating condition of test set carries out multiple charge and discharge test to the battery modules to be tested;In every charge and discharge for carrying out a preset times After electric test, the residual capacity of the battery modules to be tested is determined;Later, the battery modules to be tested determined according to each time (charge cutoff voltage of each single battery in battery modules to be tested is put for residual capacity and the corresponding each index of each residual capacity Electric blanking voltage, 100%SOC point open-circuit voltage and 0%SOC point open-circuit voltage) very poor parameter, each index mean squared error parameter and Each index dispersion parameter determines the residual capacity and the very poor related coefficient of each index, electricity to be tested of battery modules to be tested The residual capacity and each index of the related coefficient or battery modules to be tested of the residual capacity of Chi Mo group and each index mean square deviation The related coefficient of dispersion;Finally determine the consistency maintenance index of battery modules to be tested.The present invention can solve existing skill Art is also difficult to the problem of accurately determining maintenance index relevant to battery energy storage system consistency, has moved back subsequent with a batch of When labour battery modules are safeguarded, the consistency maintenance index of battery modules to be tested can be directly paid close attention to, echelon is reduced and utilizes The maintenance workload of battery energy storage power station improves maintenance efficiency.
Corresponding to above-mentioned Fig. 1 and embodiment of the method shown in Fig. 2, as shown in figure 12, the embodiment of the present invention provides a kind of ladder The secondary determining device using battery energy storage system consistency maintenance index, comprising:
Sampling unit 31 obtains electricity to be tested for being sampled in the retired battery modules of same production batch Chi Mo group;The retired battery modules of the same production batch are Mission Number having the same, and production material and technique Identical battery modules;The battery modules to be tested include the single battery of multiple series connections.
Charge and discharge test unit 32, for being carried out to the battery modules to be tested according to pre-set operating condition of test Multiple charge and discharge test, and record operating parameter of each single battery during charge and discharge test.
Residual capacity determination unit 33, for determining described to be measured after every charge and discharge test for carrying out a preset times Try the residual capacity of battery modules.
Parameter determination unit 34, for when determining the residual capacity of the battery modules to be tested every time, according to described Operating parameter determines the charge cutoff voltage of each single battery in battery modules to be tested, discharge cut-off voltage, 100%SOC point Open-circuit voltage and 0%SOC point open-circuit voltage, and determine the very poor parameter of each index, each index mean square deviation of battery modules to be tested Parameter and each index dispersion parameter;The very poor parameter of each index includes that charge cutoff voltage is very poor, discharge cut-off voltage pole Difference, 100%SOC point open-circuit voltage is very poor and 0%SOC point open-circuit voltage is very poor;Each index mean squared error parameter includes charging Blanking voltage mean square deviation, discharge cut-off voltage mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage Mean square deviation;Each index dispersion parameter includes charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC Point open-circuit voltage dispersion and 0%SOC point open-circuit voltage dispersion.
Related coefficient determination unit 35, the residual capacity of the battery modules to be tested for being determined according to each time and each surplus The very poor parameter of the corresponding each index of covolume amount, each index mean squared error parameter and each index dispersion parameter, determine electricity to be tested The residual capacity and each index mean square deviation of the residual capacity of Chi Mo group and the very poor related coefficient of each index, battery modules to be tested Related coefficient or battery modules to be tested residual capacity and each index dispersion related coefficient.
Consistency maintenance index determination unit 36, for very poor according to the residual capacity of battery modules to be tested and each index Related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or battery modules to be tested Residual capacity and each index dispersion related coefficient, determine the consistency maintenance index of battery modules to be tested.
Specifically, as shown in figure 13, the charge and discharge test unit 32, comprising:
Charge and discharge test module 321, for being carried out with pre-set charge-discharge magnification to the battery modules to be tested Multiple charge and discharge test, so that battery modules to be tested complete charge and discharge in pre-set state-of-charge SOC operation interval Process.
Voltage data logging modle 322, for recording voltage data of each single battery during charge and discharge test.
Specifically, as shown in figure 13, the residual capacity determination unit 33, comprising:
It is full full of putting cyclic test module 331, for after every charge and discharge test for carrying out a preset times, to be tested Battery modules carry out repeatedly full be full of and put cyclic test.
Discharge capacity average value determining module 332, it is full full of the flat of the discharge capacity for putting cyclic test for seeking every time Mean value, using the average value of the discharge capacity as the residual capacity of this battery modules to be tested.
In addition, the parameter determination unit 34 is specifically used for:
According to formula: ω=max xi-min xiDetermine the very poor parameter ω of each index of battery modules to be tested;Work as index When very poor parameter is that charge cutoff voltage is very poor, max xiIndicate the charge cutoff electricity of each single battery in battery modules to be tested The maximum value of pressure, min xiIndicate the minimum value of the charge cutoff voltage of each single battery in battery modules to be tested;Work as index When very poor parameter is that discharge cut-off voltage is very poor, max xiIndicate the electric discharge cut-off electricity of each single battery in battery modules to be tested The maximum value of pressure, min xiIndicate the minimum value of the discharge cut-off voltage of each single battery in battery modules to be tested;Work as index When very poor parameter is that 100%SOC point open-circuit voltage is very poor, max xiIndicate each single battery in battery modules to be tested The maximum value of 100%SOC point open-circuit voltage, min xiIndicate that the 100%SOC point of each single battery in battery modules to be tested is opened The minimum value of road voltage;When the very poor parameter of index is that 0%SOC point open-circuit voltage is very poor, max xiIndicate battery mould to be tested The maximum value of the 0%SOC point open-circuit voltage of each single battery, min x in groupiIndicate each single battery in battery modules to be tested 0%SOC point open-circuit voltage minimum value.
In addition, the parameter determination unit 34 is specifically also used to:
According to formula:Determine each index mean squared error parameter σ of battery modules to be tested;N be to Test the quantity of single battery in battery modules;When index mean squared error parameter is charge cutoff voltage mean square deviation, xiIt is to be measured The charge cutoff voltage of i-th of single battery in battery modules is tried, μ is that the charging of each single battery in battery modules to be tested is cut The only average value of voltage;When index mean squared error parameter is discharge cut-off voltage mean square deviation, xiIt is in battery modules to be tested i-th The discharge cut-off voltage of a single battery, μ are the average value of the discharge cut-off voltage of each single battery in battery modules to be tested; When index mean squared error parameter is 100%SOC point open-circuit voltage mean square deviation, xiFor i-th of monomer electricity in battery modules to be tested The 100%SOC point open-circuit voltage in pond, μ are the flat of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested Mean value;When index mean squared error parameter is 0%SOC point open-circuit voltage mean square deviation, xiFor i-th of monomer in battery modules to be tested The 0%SOC point open-circuit voltage of battery, μ are that the 0%SOC point open-circuit voltage of each single battery in battery modules to be tested is averaged Value.
In addition, the parameter determination unit 34 is specifically also used to:
According to formula: ε=(Ei- E)/E determines each index dispersion parameter ε of battery modules to be tested;When index is discrete When degree parameter is charge cutoff voltage dispersion, EiFor the charge cutoff voltage of i-th of single battery in battery modules to be tested, E is the average value of the charge cutoff voltage of each single battery in battery modules to be tested;When index dispersion parameter is that electric discharge is cut When only voltage dispersion is spent, EiFor the discharge cut-off voltage of i-th of single battery in battery modules to be tested, E is battery to be tested The average value of the discharge cut-off voltage of each single battery in mould group;When index dispersion parameter be 100%SOC point open-circuit voltage from When divergence, EiFor the 100%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is battery mould to be tested The average value of the 100%SOC point open-circuit voltage of each single battery in group;When index dispersion parameter is 0%SOC point open-circuit voltage When dispersion, EiFor the 0%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is battery mould to be tested The average value of the 0%SOC point open-circuit voltage of each single battery in group.
In addition, the related coefficient determination unit 35, is specifically used for:
According to formula:Determine the residual capacity of battery modules to be tested and each The very poor related coefficient of index, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or to be tested The related coefficient of the residual capacity of battery modules and each index dispersion;M is the residual capacity for determining battery modules to be tested Number;J indicates the jth time in the residual capacity of M determination battery modules to be tested;YjThe battery to be tested determined for jth time The residual capacity of mould group;The average value of the residual capacity of battery modules to be tested is determined for M times;0≤R≤1.
Wherein, when R is for indicating the residual capacity of battery modules to be tested and the very poor related coefficient of charge cutoff voltage When, XjDetermine that the corresponding charge cutoff voltage of residual capacity of battery modules to be tested is very poor for jth time,For each time determine to Test the very poor average value of the corresponding charge cutoff voltage of residual capacity of battery modules.
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with discharge cut-off voltage, Xj Determine that the corresponding discharge cut-off voltage of residual capacity of battery modules to be tested is very poor for jth time,It is to be tested for each determination The very poor average value of the corresponding discharge cut-off voltage of the residual capacity of battery modules.
When R is used to indicate the residual capacity and the very poor related coefficient of 100%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 100%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,It is each time Determine the very poor average value of the corresponding 100%SOC point open-circuit voltage of the residual capacity of battery modules to be tested.
When R is used to indicate the residual capacity and the very poor related coefficient of 0%SOC point open-circuit voltage of battery modules to be tested When, XjDetermine that the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,Really for each time The very poor average value of the corresponding 0%SOC point open-circuit voltage of residual capacity of fixed battery modules to be tested.
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage mean square deviation of battery modules to be tested, XjThe corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage mean square deviation of residual capacity of battery modules.
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage mean square deviation of battery modules to be tested, XjThe corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage mean square deviation of residual capacity of battery modules.
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage mean square deviation of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage mean square deviation of the residual capacity of each determination battery modules to be tested.
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage mean square deviation as R When, XjThe corresponding 0%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage mean square deviation of the residual capacity of battery modules to be tested.
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage dispersion of battery modules to be tested, XjThe corresponding charge cutoff voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding charge cutoff voltage dispersion of residual capacity of battery modules.
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage dispersion of battery modules to be tested, XjThe corresponding discharge cut-off voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For each time determine to Test the average value of the corresponding discharge cut-off voltage dispersion of residual capacity of battery modules.
When R is used to indicate the phase relation of the residual capacity and 100%SOC point open-circuit voltage dispersion of battery modules to be tested When number, XjThe corresponding 100%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,For The average value of the corresponding 100%SOC point open-circuit voltage dispersion of the residual capacity of each determination battery modules to be tested.
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 0%SOC point open-circuit voltage dispersion as R When, XjThe corresponding 0%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is each time Determine the average value of the corresponding 0%SOC point open-circuit voltage dispersion of the residual capacity of battery modules to be tested.
In addition, the consistency maintenance index determination unit 36, is specifically used for:
Determine the residual capacity of battery modules to be tested and the maximum value of the very poor related coefficient of each index, and by the phase The corresponding index of the maximum value of relationship number is determined as the consistency maintenance index of battery modules to be tested.
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index dispersion, and The corresponding index of the maximum value of the related coefficient is determined as to the consistency maintenance index of battery modules to be tested.
It is worth noting that a kind of echelon provided in an embodiment of the present invention utilizes battery energy storage system consistency maintenance index The specific implementation of determining device may refer to the corresponding embodiment of the method for above-mentioned Fig. 1 and Fig. 2, do not repeating herein.
A kind of echelon provided in an embodiment of the present invention utilizes the determining device of battery energy storage system consistency maintenance index, first It is first sampled in the retired battery modules of same production batch, obtains battery modules to be tested;Basis is set in advance later The operating condition of test set carries out multiple charge and discharge test to the battery modules to be tested;In every charge and discharge for carrying out a preset times After electric test, the residual capacity of the battery modules to be tested is determined;Later, the battery modules to be tested determined according to each time (charge cutoff voltage of each single battery in battery modules to be tested is put for residual capacity and the corresponding each index of each residual capacity Electric blanking voltage, 100%SOC point open-circuit voltage and 0%SOC point open-circuit voltage) very poor parameter, each index mean squared error parameter and Each index dispersion parameter determines the residual capacity and the very poor related coefficient of each index, electricity to be tested of battery modules to be tested The residual capacity and each index of the related coefficient or battery modules to be tested of the residual capacity of Chi Mo group and each index mean square deviation The related coefficient of dispersion;Finally determine the consistency maintenance index of battery modules to be tested.The present invention can solve existing skill Art is also difficult to the problem of accurately determining maintenance index relevant to battery energy storage system consistency, has moved back subsequent with a batch of When labour battery modules are safeguarded, the consistency maintenance index of battery modules to be tested can be directly paid close attention to, echelon is reduced and utilizes The maintenance workload of battery energy storage power station improves maintenance efficiency.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more, The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above embodiments Explanation be merely used to help understand method and its core concept of the invention;At the same time, for those skilled in the art, According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification Appearance should not be construed as limiting the invention.

Claims (4)

1. a kind of determination method that echelon utilizes battery energy storage system consistency maintenance index characterized by comprising
It is sampled in the retired battery modules of same production batch, obtains battery modules to be tested;The same production The retired battery modules of batch are Mission Number having the same, and production material and the identical battery modules of technique;It is described Battery modules to be tested include the single battery of multiple series connections;
According to pre-set operating condition of test, multiple charge and discharge test is carried out to the battery modules to be tested, and record each list Operating parameter of body battery during charge and discharge test;
After every charge and discharge test for carrying out a preset times, the residual capacity of the battery modules to be tested is determined;
When determining the residual capacity of the battery modules to be tested every time, battery mould to be tested is determined according to the operating parameter The charge cutoff voltage of each single battery, discharge cut-off voltage, 100%SOC point open-circuit voltage and 0%SOC point open circuit electricity in group Pressure, and determine the very poor parameter of each index, each index mean squared error parameter and each index dispersion parameter of battery modules to be tested;Institute Stating the very poor parameter of each index includes that charge cutoff voltage is very poor, discharge cut-off voltage is very poor, 100%SOC point open-circuit voltage is very poor It is very poor with 0%SOC point open-circuit voltage;Each index mean squared error parameter includes charge cutoff voltage mean square deviation, electric discharge cut-off electricity Press mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage mean square deviation;Each index dispersion ginseng Number includes charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC point open-circuit voltage dispersion and 0%SOC Point open-circuit voltage dispersion;
The very poor parameter of the corresponding each index of residual capacity and each residual capacity of the battery modules to be tested determined according to each time, Each index mean squared error parameter and each index dispersion parameter determine that the residual capacity of battery modules to be tested and each index are very poor Related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or battery modules to be tested Residual capacity and each index dispersion related coefficient;
Held according to the residual capacity of battery modules to be tested and the very poor related coefficient of each index, the remaining of battery modules to be tested The phase relation of amount and the related coefficient of each index mean square deviation or the residual capacity of battery modules to be tested and each index dispersion Number, determines the consistency maintenance index of battery modules to be tested;
According to pre-set operating condition of test, multiple charge and discharge test is carried out to the battery modules to be tested, and record each list Operating parameter of body battery during charge and discharge test, comprising:
Multiple charge and discharge test is carried out to the battery modules to be tested with pre-set charge-discharge magnification, so that electricity to be tested Chi Mo group completes charge and discharge process in pre-set state-of-charge SOC operation interval;
Record voltage data of each single battery during charge and discharge test;
After every charge and discharge test for carrying out a preset times, the residual capacity of the battery modules to be tested is determined, comprising:
After every charge and discharge test for carrying out a preset times, full be full of is carried out repeatedly to battery modules to be tested and puts circulation examination It tests;
Seek every time the full average value full of the discharge capacity for putting cyclic test, using the average value of the discharge capacity as this The residual capacity of battery modules to be tested;
It determines the very poor parameter of each index, each index mean squared error parameter and each index dispersion parameter of battery modules to be tested, wraps It includes:
According to formula: ω=maxxi-minxiDetermine the very poor parameter ω of each index of battery modules to be tested;When the very poor ginseng of index When number is that charge cutoff voltage is very poor, maxxiIndicate the charge cutoff voltage of each single battery in battery modules to be tested most Big value, minxiIndicate the minimum value of the charge cutoff voltage of each single battery in battery modules to be tested;When the very poor parameter of index When very poor for discharge cut-off voltage, maxxiIndicate the maximum of the discharge cut-off voltage of each single battery in battery modules to be tested Value, minxiIndicate the minimum value of the discharge cut-off voltage of each single battery in battery modules to be tested;When the very poor parameter of index is When 100%SOC point open-circuit voltage is very poor, maxxiIndicate the 100%SOC point open circuit of each single battery in battery modules to be tested The maximum value of voltage, minxiIndicate the minimum value of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested; When the very poor parameter of index is that 0%SOC point open-circuit voltage is very poor, maxxiIndicate each single battery in battery modules to be tested The maximum value of 0%SOC point open-circuit voltage, minxiIndicate the 0%SOC point open circuit electricity of each single battery in battery modules to be tested The minimum value of pressure;
Determine the very poor parameter of each index, each index mean squared error parameter and each index dispersion parameter of battery modules to be tested, also Include:
According to formula:Determine each index mean squared error parameter σ of battery modules to be tested;N is to be tested The quantity of single battery in battery modules;When index mean squared error parameter is charge cutoff voltage mean square deviation, xiFor electricity to be tested The charge cutoff voltage of i-th of single battery in Chi Mo group, μ are the charge cutoff electricity of each single battery in battery modules to be tested The average value of pressure;When index mean squared error parameter is discharge cut-off voltage mean square deviation, xiIt is single for i-th in battery modules to be tested The discharge cut-off voltage of body battery, μ are the average value of the discharge cut-off voltage of each single battery in battery modules to be tested;Work as finger When mark mean squared error parameter is 100%SOC point open-circuit voltage mean square deviation, xiFor i-th single battery in battery modules to be tested 100%SOC point open-circuit voltage, μ are the average value of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested; When index mean squared error parameter is 0%SOC point open-circuit voltage mean square deviation, xiFor i-th of single battery in battery modules to be tested 0%SOC point open-circuit voltage, μ be battery modules to be tested in each single battery 0%SOC point open-circuit voltage average value;
Determine the very poor parameter of each index, each index mean squared error parameter and each index dispersion parameter of battery modules to be tested, also Include:
According to formula: ε=(Ei- E)/E determines each index dispersion parameter ε of battery modules to be tested;When index dispersion parameter When for charge cutoff voltage dispersion, EiFor the charge cutoff voltage of i-th of single battery in battery modules to be tested, E be to Test the average value of the charge cutoff voltage of each single battery in battery modules;When index dispersion parameter is discharge cut-off voltage When dispersion, EiFor the discharge cut-off voltage of i-th of single battery in battery modules to be tested, E is in battery modules to be tested The average value of the discharge cut-off voltage of each single battery;When index dispersion parameter is 100%SOC point open-circuit voltage dispersion When, EiFor the 100%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is in battery modules to be tested The average value of the 100%SOC point open-circuit voltage of each single battery;When index dispersion parameter is that 0%SOC point open-circuit voltage is discrete When spending, EiFor the 0%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is in battery modules to be tested The average value of the 0%SOC point open-circuit voltage of each single battery;
The very poor parameter of the corresponding each index of residual capacity and each residual capacity of the battery modules to be tested determined according to each time, Each index mean squared error parameter and each index dispersion parameter determine that the residual capacity of battery modules to be tested and each index are very poor Related coefficient, the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation or battery modules to be tested Residual capacity and each index dispersion related coefficient, comprising:
According to formula:Determine the residual capacity and each index of battery modules to be tested The residual capacity of very poor related coefficient, battery modules to be tested and the related coefficient or battery to be tested of each index mean square deviation The related coefficient of the residual capacity of mould group and each index dispersion;M is the number for determining the residual capacity of battery modules to be tested; J indicates the jth time in the residual capacity of M determination battery modules to be tested;YjFor the determining battery modules to be tested of jth time Residual capacity;The average value of the residual capacity of battery modules to be tested is determined for M times;0≤R≤1;
Wherein, when R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with charge cutoff voltage, Xj Determine that the corresponding charge cutoff voltage of residual capacity of battery modules to be tested is very poor for jth time,It is to be tested for each determination The very poor average value of the corresponding charge cutoff voltage of the residual capacity of battery modules;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with discharge cut-off voltage, XjFor jth The corresponding discharge cut-off voltage of residual capacity of secondary determination battery modules to be tested is very poor,Battery mould to be tested is determined for each time The very poor average value of the corresponding discharge cut-off voltage of residual capacity of group;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with 100%SOC point open-circuit voltage, Xj Determine that the corresponding 100%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,It is determined for each time The very poor average value of the corresponding 100%SOC point open-circuit voltage of the residual capacity of battery modules to be tested;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with 0%SOC point open-circuit voltage, XjFor Jth time determines that the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor,It is to be measured for each determination Try the very poor average value of the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage mean square deviation of battery modules to be tested, XjIt is The corresponding charge cutoff voltage mean square deviation of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding charge cutoff voltage mean square deviation of the residual capacity of Chi Mo group;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage mean square deviation of battery modules to be tested, XjIt is The corresponding discharge cut-off voltage mean square deviation of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding discharge cut-off voltage mean square deviation of the residual capacity of Chi Mo group;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 100%SOC point open-circuit voltage mean square deviation as R When, XjThe corresponding 100%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is each The average value of the corresponding 100%SOC point open-circuit voltage mean square deviation of the residual capacity of secondary determination battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and 0%SOC point open-circuit voltage mean square deviation of battery modules to be tested, Xj The corresponding 0%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is determined for each time The average value of the corresponding 0%SOC point open-circuit voltage mean square deviation of the residual capacity of battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage dispersion of battery modules to be tested, XjIt is The corresponding charge cutoff voltage dispersion of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding charge cutoff voltage dispersion of the residual capacity of Chi Mo group;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage dispersion of battery modules to be tested, XjIt is The corresponding discharge cut-off voltage dispersion of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding discharge cut-off voltage dispersion of the residual capacity of Chi Mo group;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 100%SOC point open-circuit voltage dispersion as R When, XjThe corresponding 100%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is each The average value of the corresponding 100%SOC point open-circuit voltage dispersion of the residual capacity of secondary determination battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and 0%SOC point open-circuit voltage dispersion of battery modules to be tested, Xj The corresponding 0%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is determined for each time The average value of the corresponding 0%SOC point open-circuit voltage dispersion of the residual capacity of battery modules to be tested.
2. echelon according to claim 1 utilizes the determination method of battery energy storage system consistency maintenance index, feature It is, according to the residue of the residual capacity of battery modules to be tested and the very poor related coefficient of each index, battery modules to be tested Capacity is related with each index dispersion to the residual capacity of the related coefficient of each index mean square deviation or battery modules to be tested Coefficient determines the consistency maintenance index of battery modules to be tested, comprising:
Determine the residual capacity of battery modules to be tested and the maximum value of the very poor related coefficient of each index, and by the phase relation The corresponding index of several maximum values is determined as the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation, and by institute The corresponding index of maximum value for stating related coefficient is determined as the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index dispersion, and by institute The corresponding index of maximum value for stating related coefficient is determined as the consistency maintenance index of battery modules to be tested.
3. the determining device that a kind of echelon utilizes battery energy storage system consistency maintenance index characterized by comprising
Sampling unit obtains battery modules to be tested for being sampled in the retired battery modules of same production batch; The retired battery modules of the same production batch are Mission Number having the same, and production material and the identical electricity of technique Chi Mo group;The battery modules to be tested include the single battery of multiple series connections;
Charge and discharge test unit, for repeatedly being filled to the battery modules to be tested according to pre-set operating condition of test Discharge test, and record operating parameter of each single battery during charge and discharge test;
Residual capacity determination unit, for determining the battery to be tested after every charge and discharge test for carrying out a preset times The residual capacity of mould group;
Parameter determination unit, for being joined according to the operation when determining the residual capacity of the battery modules to be tested every time Number determines the charge cutoff voltage of each single battery in battery modules to be tested, discharge cut-off voltage, 100%SOC point open circuit electricity Pressure and 0%SOC point open-circuit voltage, and determine the very poor parameters of each index of battery modules to be tested, each index mean squared error parameter and Each index dispersion parameter;The very poor parameter of each index include charge cutoff voltage is very poor, discharge cut-off voltage is very poor, 100%SOC point open-circuit voltage is very poor and 0%SOC point open-circuit voltage is very poor;Each index mean squared error parameter includes charge cutoff Voltage mean square deviation, discharge cut-off voltage mean square deviation, 100%SOC point open-circuit voltage mean square deviation and 0%SOC point open-circuit voltage are square Difference;Each index dispersion parameter includes that charge cutoff voltage dispersion, discharge cut-off voltage dispersion, 100%SOC point are opened Road voltage dispersion degree and 0%SOC point open-circuit voltage dispersion;
Related coefficient determination unit, the residual capacity and each residual capacity of the battery modules to be tested for being determined according to each time The very poor parameter of corresponding each index, each index mean squared error parameter and each index dispersion parameter, determine battery modules to be tested Residual capacity and the residual capacity of the very poor related coefficient of each index, battery modules to be tested it is related with each index mean square deviation The related coefficient of the residual capacity of coefficient or battery modules to be tested and each index dispersion;
Consistency maintenance index determination unit, for according to very poor related of the residual capacities of battery modules to be tested and each index The residual capacity and the related coefficient of each index mean square deviation or the residue of battery modules to be tested of coefficient, battery modules to be tested The related coefficient of capacity and each index dispersion determines the consistency maintenance index of battery modules to be tested;
The charge and discharge test unit, comprising:
Charge and discharge test module, for carrying out multiple charge and discharge to the battery modules to be tested with pre-set charge-discharge magnification Electric test, so that battery modules to be tested complete charge and discharge process in pre-set state-of-charge SOC operation interval;
Voltage data logging modle, for recording voltage data of each single battery during charge and discharge test;
The residual capacity determination unit, comprising:
It is full full of putting cyclic test module, for after every charge and discharge test for carrying out a preset times, to battery mould to be tested Group carries out repeatedly full be full of and puts cyclic test;
Discharge capacity average value determining module, for seeking every time the full average value full of the discharge capacity for putting cyclic test, with Residual capacity of the average value of the discharge capacity as this battery modules to be tested;
The parameter determination unit is specifically used for:
According to formula: ω=maxxi-minxiDetermine the very poor parameter ω of each index of battery modules to be tested;When the very poor ginseng of index When number is that charge cutoff voltage is very poor, maxxiIndicate the charge cutoff voltage of each single battery in battery modules to be tested most Big value, minxiIndicate the minimum value of the charge cutoff voltage of each single battery in battery modules to be tested;When the very poor parameter of index When very poor for discharge cut-off voltage, maxxiIndicate the maximum of the discharge cut-off voltage of each single battery in battery modules to be tested Value, minxiIndicate the minimum value of the discharge cut-off voltage of each single battery in battery modules to be tested;When the very poor parameter of index is When 100%SOC point open-circuit voltage is very poor, maxxiIndicate the 100%SOC point open circuit of each single battery in battery modules to be tested The maximum value of voltage, minxiIndicate the minimum value of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested; When the very poor parameter of index is that 0%SOC point open-circuit voltage is very poor, maxxiIndicate each single battery in battery modules to be tested The maximum value of 0%SOC point open-circuit voltage, minxiIndicate the 0%SOC point open circuit electricity of each single battery in battery modules to be tested The minimum value of pressure;
The parameter determination unit is specifically also used to:
According to formula:Determine each index mean squared error parameter σ of battery modules to be tested;N is to be tested The quantity of single battery in battery modules;When index mean squared error parameter is charge cutoff voltage mean square deviation, xiFor electricity to be tested The charge cutoff voltage of i-th of single battery in Chi Mo group, μ are the charge cutoff electricity of each single battery in battery modules to be tested The average value of pressure;When index mean squared error parameter is discharge cut-off voltage mean square deviation, xiIt is single for i-th in battery modules to be tested The discharge cut-off voltage of body battery, μ are the average value of the discharge cut-off voltage of each single battery in battery modules to be tested;Work as finger When mark mean squared error parameter is 100%SOC point open-circuit voltage mean square deviation, xiFor i-th single battery in battery modules to be tested 100%SOC point open-circuit voltage, μ are the average value of the 100%SOC point open-circuit voltage of each single battery in battery modules to be tested; When index mean squared error parameter is 0%SOC point open-circuit voltage mean square deviation, xiFor i-th of single battery in battery modules to be tested 0%SOC point open-circuit voltage, μ be battery modules to be tested in each single battery 0%SOC point open-circuit voltage average value;
The parameter determination unit is specifically also used to:
According to formula: ε=(Ei- E)/E determines each index dispersion parameter ε of battery modules to be tested;When index dispersion parameter When for charge cutoff voltage dispersion, EiFor the charge cutoff voltage of i-th of single battery in battery modules to be tested, E be to Test the average value of the charge cutoff voltage of each single battery in battery modules;When index dispersion parameter is discharge cut-off voltage When dispersion, EiFor the discharge cut-off voltage of i-th of single battery in battery modules to be tested, E is in battery modules to be tested The average value of the discharge cut-off voltage of each single battery;When index dispersion parameter is 100%SOC point open-circuit voltage dispersion When, EiFor the 100%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is in battery modules to be tested The average value of the 100%SOC point open-circuit voltage of each single battery;When index dispersion parameter is that 0%SOC point open-circuit voltage is discrete When spending, EiFor the 0%SOC point open-circuit voltage of i-th of single battery in battery modules to be tested, E is in battery modules to be tested The average value of the 0%SOC point open-circuit voltage of each single battery;
The related coefficient determination unit, is specifically used for:
According to formula:Determine the residual capacity and each index of battery modules to be tested The residual capacity of very poor related coefficient, battery modules to be tested and the related coefficient or battery to be tested of each index mean square deviation The related coefficient of the residual capacity of mould group and each index dispersion;M is the number for determining the residual capacity of battery modules to be tested; J indicates the jth time in the residual capacity of M determination battery modules to be tested;YjFor the determining battery modules to be tested of jth time Residual capacity;The average value of the residual capacity of battery modules to be tested is determined for M times;0≤R≤1;
Wherein, when R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with charge cutoff voltage, Xj Determine that the corresponding charge cutoff voltage of residual capacity of battery modules to be tested is very poor for jth time,It is to be tested for each determination The very poor average value of the corresponding charge cutoff voltage of the residual capacity of battery modules;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with discharge cut-off voltage, XjFor jth The corresponding discharge cut-off voltage of residual capacity of secondary determination battery modules to be tested is very poor,Battery mould to be tested is determined for each time The very poor average value of the corresponding discharge cut-off voltage of residual capacity of group;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with 100%SOC point open-circuit voltage, Xj Determine that the corresponding 100%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor for jth time,It is determined for each time The very poor average value of the corresponding 100%SOC point open-circuit voltage of the residual capacity of battery modules to be tested;
When R is used to indicate the residual capacity of the battery modules to be tested related coefficient very poor with 0%SOC point open-circuit voltage, XjFor Jth time determines that the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules to be tested is very poor,It is to be measured for each determination Try the very poor average value of the corresponding 0%SOC point open-circuit voltage of residual capacity of battery modules;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage mean square deviation of battery modules to be tested, XjIt is The corresponding charge cutoff voltage mean square deviation of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding charge cutoff voltage mean square deviation of the residual capacity of Chi Mo group;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage mean square deviation of battery modules to be tested, XjIt is The corresponding discharge cut-off voltage mean square deviation of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding discharge cut-off voltage mean square deviation of the residual capacity of Chi Mo group;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 100%SOC point open-circuit voltage mean square deviation as R When, XjThe corresponding 100%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is each The average value of the corresponding 100%SOC point open-circuit voltage mean square deviation of the residual capacity of secondary determination battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and 0%SOC point open-circuit voltage mean square deviation of battery modules to be tested, Xj The corresponding 0%SOC point open-circuit voltage mean square deviation of residual capacity of battery modules to be tested is determined for jth time,It is determined for each time The average value of the corresponding 0%SOC point open-circuit voltage mean square deviation of the residual capacity of battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and charge cutoff voltage dispersion of battery modules to be tested, XjIt is The corresponding charge cutoff voltage dispersion of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding charge cutoff voltage dispersion of the residual capacity of Chi Mo group;
When R is used to indicate the related coefficient of residual capacity and discharge cut-off voltage dispersion of battery modules to be tested, XjIt is The corresponding discharge cut-off voltage dispersion of the residual capacity of j determination battery modules to be tested,Electricity to be tested is determined for each time The average value of the corresponding discharge cut-off voltage dispersion of the residual capacity of Chi Mo group;
It is used to indicate the residual capacity of battery modules to be tested and the related coefficient of 100%SOC point open-circuit voltage dispersion as R When, XjThe corresponding 100%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is each The average value of the corresponding 100%SOC point open-circuit voltage dispersion of the residual capacity of secondary determination battery modules to be tested;
When R is used to indicate the related coefficient of residual capacity and 0%SOC point open-circuit voltage dispersion of battery modules to be tested, Xj The corresponding 0%SOC point open-circuit voltage dispersion of residual capacity of battery modules to be tested is determined for jth time,It is determined for each time The average value of the corresponding 0%SOC point open-circuit voltage dispersion of the residual capacity of battery modules to be tested.
4. echelon according to claim 3 utilizes the determining device of battery energy storage system consistency maintenance index, feature It is, the consistency maintenance index determination unit is specifically used for:
Determine the residual capacity of battery modules to be tested and the maximum value of the very poor related coefficient of each index, and by the phase relation The corresponding index of several maximum values is determined as the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index mean square deviation, and by institute The corresponding index of maximum value for stating related coefficient is determined as the consistency maintenance index of battery modules to be tested;
Alternatively, determine the maximum value of the residual capacity of battery modules to be tested and the related coefficient of each index dispersion, and by institute The corresponding index of maximum value for stating related coefficient is determined as the consistency maintenance index of battery modules to be tested.
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