CN110504501A - Retired battery Gradient utilization method and system - Google Patents
Retired battery Gradient utilization method and system Download PDFInfo
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- CN110504501A CN110504501A CN201910762678.6A CN201910762678A CN110504501A CN 110504501 A CN110504501 A CN 110504501A CN 201910762678 A CN201910762678 A CN 201910762678A CN 110504501 A CN110504501 A CN 110504501A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides retired battery Gradient utilization method, including retired battery sorting, retired battery group and retired battery composition energy-storage system.The present invention also provides retired battery echelons to utilize system, the energy management unit of charge and discharge is carried out including energy-storage system and for controlling the energy-storage system, energy-storage system is that 570~832.2V battery cluster is constituted by several operating voltages, if the battery cluster includes dry cell batteries in parallel；The battery pack includes concatenated retired battery, PCS and monitoring unit.The present invention solves the problems, such as retired battery with two side terminals by group string distributed structure/architecture, and this mode simplifies many in process, not only energy-storage battery ZOOM analysis can be gone back the guarantee battery with two side terminals of maximizing.And can guarantee the operation steady in a long-term of whole system, objectively also increase safety and service life that echelon utilizes energy-storage system；Meanwhile present invention reduces the cost that echelon utilizes, application and popularizations applications.
Description
Technical field
The present invention relates to battery echelons to utilize technical field, in particular to a kind of retired battery Gradient utilization method；Meanwhile
The invention further relates to a kind of retired battery echelons to utilize system.
Background technique
With flourishing for new-energy automobile industry, especially rapidly increase recently as new-energy automobile yield,
Retired power battery also increasingly increases.For power battery at present based on lithium battery, power battery performance can be with charge and discharge time
Several increases and decay, when battery capacity decays to 80% or less rated capacity, user experience is not only caused to be deteriorated, and
Security risk can be also brought under the working condition of power battery complexity.In order to ensure in the power performance of electric car, driving
The power battery of safety in journey and use process, electric car must be replaced, and retired power battery also increasingly increases.But
It is that the active volume of the retired power battery to get off usually still remaining 70% to 80% directly scraps waste of resource and very may be used
Cherish, and the recycling of lithium battery is different from lead-acid battery or lead carbon battery, recovery value is not high, but the cost recycled is very
It is high.
Through detecting, by the retired power battery of the link processings such as test, screening, recombination, still with the ability in spare
The operating conditions such as power supply, power energy storage are relatively good and to the lower field of battery performance requirements, to realize the battery life-cycle
Period makes full use of, this is that retired battery echelon utilizes.Currently, retired battery echelon is moved back using energy storage is mainly used for
The echelon for using as a servant power battery is put into using the initial stage that can further decrease energy storage and backup power source, increases battery service life,
The wasting of resources is reduced, there is huge economic benefit and environmental benefit.
Current retired battery echelon by the way of mainly have: 1) dismantling is single battery, carry out it is secondary uses in groups, should
Method can be realized the status assessment to every single battery, high reliablity when secondary use, but according to existing production practices,
If integral battery pack broken will have been welded to single battery core in retired power battery, then screened,
With with recombinate again, entire technique is extremely complex, causes cost recovery close to buying new battery.Therefore, this echelon utilizes
Technology path is simultaneously uneconomical；2) directly by entire battery pack in microgrid energy-storage system, the secondary use cost of this method is lower, but
It can decay there are percentage of batteries more serious, cause the service life of entire battery pack very short；Even, due to retired battery
The difference of voltage class, residual capacity and material type, retired battery cannot be directly used in energy-storage system as new battery,
Large-scale series-parallel use is not can be carried out.
Therefore, how a kind of retired battery Gradient utilization method is provided, with overcome in the prior art due to retired battery not
The safety problem that consistency causes becomes those skilled in the art urgently meanwhile, it is capable to reduce the cost that retired battery echelon utilizes
Problem to be solved.
Summary of the invention
In view of this, the present invention is directed to propose a kind of retired battery Gradient utilization method, with overcome in the prior art due to
The safety problem that retired battery inconsistency causes, meanwhile, it is capable to reduce the cost that retired battery echelon utilizes.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of retired battery Gradient utilization method, including the following steps:
A, retired battery sorting: retired battery is sorted according to the cell health state parameter SOH standard determined, is sentenced
Whether the retired battery that breaks can carry out echelon utilization；If so, thening follow the steps b；If it is not, then scrapping processing；
B, retired battery group: the retired battery is grouped according to the retired cell classification standard determined；
C, retired battery composition energy-storage system: same group of retired battery pack is connected to be formed substantially with PCS, monitoring unit
Energy-storage units；Several basic energy-storage units parallel connections are formed into battery cluster；Several battery cluster parallel connections are formed into power not
Deng energy-storage system；By the energy-storage system and energy management unit communication connection；Wherein, the operating voltage of the battery cluster is
570~832.2V.
Further, the retired battery Gradient utilization method further includes that the energy management unit control discharge-rate is
0.2C-2C, depth of discharge 60%-90%.
Further, step a includes
A1, the sorting of retired battery appearance: being sorted according to the appearance standard of retired battery determined, judges that can it into
Enter retired battery history data sorting；
A2, the sorting of retired battery history operation data: the history fortune of the retired battery sorted through retired battery appearance is obtained
Row data, the history data standard according to the retired battery determined are sorted, and it is strong to judge that can it enter retired battery
The sorting of health state；
A3, retired battery current capacities value is obtained based on battery core appearance detection device；Calculate retired cell health state ginseng
Number SOH.
Further, the appearance standard are as follows: well-tended appearance, battery identification are clearly correct, and without it is damaged, without deformation, nothing
Spot, without leakage.
Further, the history data standard are as follows: nothing overcharges record, fills without nothing under over-discharge record, superheat state
Electric discharge recording and history data can be read.
Further, the history data of the retired battery to be detected is no less than 10.
Further, the cell health state parameter SOH is not less than 65%.
Further, retired battery is grouped according to the cell health state parameter SOH in step b, specifically:
If SOH >=80%, retired battery is A group；
If 70%≤SOH < 80%, retired battery is B group；
If 65%≤SOH < 70%, retired battery is C group；
If SOH < 65%, retired battery is D group, is rejected.
Meanwhile the present invention provides a kind of echelons of retired battery to utilize system, to realize the echelon of above-mentioned retired battery
Utilize method.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of echelon of retired battery utilizes system, energy-storage system including communication connection and for controlling the energy storage system
System carries out the energy management unit of charge and discharge, and the energy-storage system is that 570~832.2V battery cluster is constituted by several operating voltages,
If the battery cluster includes dry cell batteries in parallel；The battery pack includes concatenated retired battery, PCS and monitoring unit.
Further, the energy management unit control discharge-rate is 0.2C-2C, depth of discharge 60%-90%.
Compared with the existing technology, present invention has the advantage that
(1) present invention directlys adopt the concatenated retired battery pack of vehicle and carries out echelon utilization to retired battery, does not need pair
Battery carries out dismantling and re-assemblies, and avoids that working efficiency screening to monomer caused by is low, at high cost, workload is huge, saves
The screening cost that about retired battery recycles, reduces the cost that echelon utilizes, field of batteries can be widely applied.Using this hair
Bright retired battery Gradient utilization method, compared to new lithium battery, cost can save more than half, be suitable for promoting.
(2) present invention solves the problems, such as retired battery with two side terminals by group string distributed structure/architecture, will tear open on same vehicle
A whole set of the retired power battery to get off energy-storage units battery pack basic as one, with PCS, monitoring unit in series one
A basic energy-storage units, then parallel with one another constitute the medium-and-large-sized energy-storage system of power not etc..This mode simplifies in process
Energy-storage battery ZOOM analysis not only can be gone back the guarantee battery with two side terminals of maximizing by many.And it can guarantee the whole series
The operation steady in a long-term of system objectively also increases safety and service life that echelon utilizes energy-storage system.
(3) present invention is by control discharge-rate, to ensure the stabilization of monomer battery voltage in retired battery；Pass through simultaneously
Control depth of discharge is increased with realizing the stabilization of the voltage of highest single battery battery core and the voltage difference of minimum battery core voltage
Echelon utilizes the safety of energy-storage system, is finally reached the purpose for enabling energy-storage system to run steadily in the long term.
(4) technical solution of the present invention is used, the sorting of retired battery appearance, retired battery history operation data point are passed through
Choosing, the sorting of retired cell health state are grouped retired battery according to the cell health state standard determined, realize fast
Speed effectively carries out echelon utilization to retired battery, is conducive to the service performance for promoting retired battery, and the one of effective guarantee battery
Cause property and reliability, improve the economy and safety of battery recycling；Reduce the inconsistency pair due to retired battery simultaneously
The influence of system improves the service life of retired battery；The surplus value of retired battery can be played to greatest extent again.
(5) it does not need completely to be charged and discharged it since retired battery core of the invention holds detection method
Journey, therefore the loss of retired battery will not be caused because of the charging and discharging process, be further ensured that retired battery into
Service performance when row recycles.
Detailed description of the invention
It, below will be to embodiment in order to illustrate more clearly of embodiment of the present invention or technical solution in the prior art
Or attached drawing needed to be used in the description of the prior art does and simply introduces, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the present invention, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is the structural block diagram that the retired battery echelon of the present invention utilizes system；
Fig. 2 is the flow diagram sorted in the retired battery Gradient utilization method of the embodiment of the present invention 1；
Fig. 3 is the schematic diagram of 1 neural network algorithm of the embodiment of the present invention；
Fig. 4 is the system topological figure that the retired battery echelon of the embodiment of the present invention 2 utilizes.
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
Whole description.Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
It is obtained by those of ordinary skill in the art without making creative efforts every other in the embodiment of the present invention
Embodiment shall fall within the protection scope of the present invention.
One skilled in the art will appreciate that embodiments of the present invention may be implemented a kind of system, device, equipment, method or
Computer program.Therefore, the present invention can be with specific implementation is as follows, it may be assumed that complete hardware, complete software are (including solid
Part, resident software, microcode etc.) or hardware and software combine form.
In addition, any number of elements in attached drawing is used to example rather than limitation and any name are only used for distinguishing,
Without any restrictions meaning.
Herein, technical terms " retired battery " include but is not limited to have logged out use, prepare to exit use, possibility
Other situations such as no longer come into operation for the battery such as vehicle, battery pack, battery pack etc.；Technical terms " ... module "
It include the component, device or equipment for allowing to implement by hardware, software, or its combination.
PCS (Power Conversion System): energy accumulation current converter can control the charging and discharging process of battery,
The transformation for carrying out alternating current-direct current can directly power under no grid condition for AC load.PCS is by DC/AC bidirectional converter, control
Unit processed etc. is constituted.PCS controller receives Background control instruction by communication, is become according to the symbol of power instruction and size control
Stream device is charged the battery or is discharged, and realizes the adjusting to network re-active power and reactive power.PCS controller passes through CAN
Interface and BMS are communicated, and obtain battery state information, it can be achieved that protectiveness charge and discharge to battery, it is ensured that battery operation safety.
Discharge-rate refers to discharge current, puts battery discharge status close to the discharge condition of constant current, in constant current always
In the case of electricity condition, the variation of battery both end voltage is regular governed.
Depth of discharge refers to how many electricity put, for example 80 percent electricity is put into from absolutely electricity, puts
Electric depth is 20%.
It shallowly fills and shallowly puts, refer to being charged and discharged the maximum capacity for reaching battery not very, is i.e. charging is not filled with, and is put
Electricity does not discharge.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention relates to retired battery Gradient utilization method, main design idea is: passing through a group string distributed structure/architecture
It solves the problems, such as retired battery with two side terminals, by energy-storage battery ZOOM analysis, can not only go back the guarantee battery of maximizing
Consistency.
By the setting of the whole design thought, it is able to ascend the service performance of retired battery, is finally reached to greatest extent
Play the purpose of the surplus value of retired battery.
Embodiment 1
Based on design philosophy as above, in the specific limits scheme of one of which of the invention, retired battery Gradient utilization method
Include the following steps:
A kind of retired battery Gradient utilization method, including the following steps:
A, retired battery sorting: retired battery is sorted according to the cell health state parameter SOH standard determined, is sentenced
Whether the retired battery that breaks can carry out echelon utilization；If so, thening follow the steps b；If it is not, then scrapping processing.Preferably, described
The sorting step of retired battery can include:
A1, the sorting of retired battery appearance: being sorted according to the appearance standard of retired battery determined, judges that can it into
Enter retired battery history data sorting；It is furthermore preferred that the appearance standard are as follows: well-tended appearance, battery identification are clearly correct, and nothing
It is damaged, without deformation, without spot, without leakage.In particular, carrying out appearance inspection to retired battery pack under the conditions of light is good
It looks into.If retired battery does not meet preset appearance standard, it is judged as unqualified, directly scraps processing (not recycling).If
Retired battery meets preset appearance standard, then is judged as sorting that is qualified, and entering retired battery history operation data
Process.For preset appearance standard, can be needed according to various concrete applications flexibly to be set.
A2, the sorting of retired battery history operation data: the history fortune of the retired battery sorted through retired battery appearance is obtained
Row data, the history data standard according to the retired battery determined are sorted, and it is strong to judge that can it enter retired battery
The sorting of health state；It is furthermore preferred that the history data standard are as follows: nothing overcharges record, without nothing under over-discharge record, superheat state
Charge and discharge electrographic recording and history data can be read.
Specifically, BMS (BMS:Battery Management System, the battery that can be directly connected in retired battery pack
Management system) plate, reads retired battery pack history data.If retired battery does not meet preset history data mark
Standard is then judged as unqualified, directly scraps processing (not recycling).If retired battery meets preset history data mark
Standard is then judged as qualified, and is entered retired cell health state and sorted process.For preset history data mark
Standard can be needed according to various concrete applications flexibly to be set.Preferably, the historical data is based on retired battery
Life cycle in detection data.
A3, the sorting of retired cell health state:
Firstly, holding detection device based on battery core obtains retired battery current capacities value.Specifically, core can be held to detection dress
It sets and establishes connection with the BMS of retired battery.After calculating, the screen that core holds detection device shows retired battery current capacities
Discreet value.Then, according to the discreet value of the above-mentioned retired battery current capacities, battery rated capacity is obtained in conjunction with battery nameplate,
Calculate retired cell health state.Wherein, health status (SOH:State of Health): i.e. battery is in desired week time
It can be reliably the health status of the battery of load supplying in phase.SOH can use the capacity of battery and the percentage of rated capacity
It quantitatively indicates, i.e.,
Hold detection method to the retired battery core below to be introduced.A kind of retired battery core appearance detection method, including under
Column step:
A, the history data of retired battery is obtained, the history data of the retired battery includes the retired electricity
Voltage data and current data in the recent charge and discharge process in pond；It specifically, can be straight by following retired battery cores appearance detection devices
BMS (BMS:Battery Management System, battery management system) plate in retired battery pack is connect in succession, and reading is moved back
Use as a servant battery pack history data.Wherein, charge-discharge process is calculated as 1 complete acquisition voltage data and current data mistake
Journey.
B, based on voltage data, current data and the neural network algorithm in the retired recent charge and discharge process of battery,
Obtain the discreet value of retired battery current capacities；
C, the discreet value of retired battery current capacities is exported.
The history data of the retired battery is no less than 10.It as a result, should the retired system based on neural network algorithm
The discreet value of system current capacities is that the historical data based on more retired battery is calculated, and further ensures the core and holds inspection
The accuracy rate of survey method.
Step c further include: based in the retired recent charge and discharge process of battery voltage data and current data and institute
Neural network algorithm is stated, obtains calculating error, further to increase the accuracy of the detection method.
The history data of the retired battery further include: overcharge number and overdischarge number.Due to retired battery
Safety of performance when being directly related to its application, therefore obtain overcharge number and overdischarge number further to described
Retired battery is judged, in order to the classification and concrete application of retired battery, improves security performance when its application.
The step of neural network algorithm is (such as Fig. 3):
C21, initialization connection weight, Node B threshold；
C22, voltage, the electric current for inputting charge or discharge；
C23, take one group of voltage, current data as sample；
C24, hidden layer node output is calculated；
C25, output layer output is calculated；
C26, connection weight and Node B threshold are updated；
C27, judge whether comprising total data；If so, carrying out in next step；If it is not, then return step c22；
C28, error in judgement are less than lower limit 5% or whether study number reaches the upper limit 10000 times；If so, carrying out next
Step；If it is not, then return step c24；
C29, the discreet value for obtaining retired battery current capacities.
B, retired battery group: the retired battery is grouped according to the retired cell classification standard determined.Specifically
Ground can preset several cell health state standards as needed, be grouped with the retired battery to step a.For preset
Cell health state standard, specific number and threshold value can be needed according to various concrete applications flexibly to be set, with benefit
It is utilized in retired battery echelon, improves the service performance of retired battery.The present embodiment retired battery makes in order to further increase
With performance, the grouping standard of the present embodiment specifically:
If SOH >=80%, retired battery is A group；
If 70%≤SOH < 80%, retired battery is B group；
If 65%≤SOH < 70%, retired battery is C group；
If SOH < 65%, retired battery is D group, is rejected.
Above-mentioned group technology, is conducive to the service performance for promoting retired battery, effective guarantee battery with two side terminals and reliable
Property, while reducing influence of the inconsistency to system due to retired battery.Can effectively improve grouping reasonability, precisely
Property and flexibility, be conducive to retired battery carry out echelon utilization.Preferably, the cell health state parameter SOH standard
For not less than 65%, to be further ensured that service performance that retired battery echelon utilizes.
C, retired battery composition energy-storage system: same group of retired battery pack is connected to be formed substantially with PCS, monitoring unit
Energy-storage units；Several basic energy-storage units parallel connections are formed into battery cluster；Several battery cluster parallel connections are formed into power not
Deng energy-storage system；By the energy-storage system and energy management unit communication connection；Wherein, the operating voltage of the battery cluster is
570~832.2V.
Firstly, the present invention, which directlys adopt the concatenated retired battery pack of vehicle, carries out echelon utilization to retired battery, do not need
Dismantling is carried out to battery to re-assembly, and avoids that working efficiency caused by being screened to monomer is low, at high cost, workload is huge,
The screening cost that retired battery recycles has been saved, the cost that echelon utilizes has been reduced, field of batteries can be widely applied.Using this
The retired battery Gradient utilization method of invention, compared to new lithium battery, cost can save more than half, be suitable for promoting.
Secondly, the present invention solves the problems, such as retired battery with two side terminals by group string distributed structure/architecture, it will be on same vehicle
A whole set of the retired power battery removed energy-storage units battery pack basic as one, it is in series with PCS, monitoring unit
One basic energy-storage units, then parallel with one another constitute the medium-and-large-sized energy-storage system of power not etc..This mode is simple in process
Change many, not only energy-storage battery ZOOM analysis can be gone back into the guarantee battery with two side terminals of maximizing.And it can guarantee whole
The operation steady in a long-term of set system objectively also increases the safety that echelon utilizes energy-storage system.
Finally, simultaneously, the present invention directlys adopt the concatenated retired battery pack of vehicle and carries out echelon utilization to retired battery, no
It needs to carry out battery dismantling to re-assembly, avoids that monomer is carried out to screen to cause the high workload of working efficiency low cost huge,
The screening cost that retired battery recycles is saved, the cost that echelon utilizes is reduced, field of batteries can be widely applied.
The performance of the retired battery Gradient utilization method in order to further increase is specific in one of which of the invention
In embodiment, the retired battery Gradient utilization method further includes that the energy management unit control discharge-rate is 0.2C-
2C, depth of discharge 60%-90%.Ensure that cell safety and reliable long-time use the longevity by shallowly filling the operation reserve shallowly put
Life.Capacity, voltage, internal resistance of battery etc. can form the drop of cliff of displacement formula when echelon utilizes under seldom cycle-index, crucial
Reason is exactly that discharge-rate and depth of discharge control are bad.By controlling discharge-rate, to ensure single battery in retired battery
The stabilization of voltage；Simultaneously by control depth of discharge, to realize the voltage and minimum battery core voltage of highest single battery battery core
The stabilization of voltage difference increases the safety that echelon utilizes energy-storage system, and being finally reached enables energy-storage system to transport steadily in the long term
Capable purpose.
Using technical solution of the present invention, by the sorting of retired battery appearance, the sorting of retired battery history operation data, move back
The sorting of labour cell health state is grouped retired battery according to the cell health state standard determined, and realizing quickly has
Effect ground carries out echelon utilization to retired battery, is conducive to the service performance for promoting retired battery, effective guarantee battery with two side terminals
And reliability, improve the economy and safety of battery recycling；Reduce the inconsistency due to retired battery to system simultaneously
Influence；The surplus value of retired battery can be played to greatest extent again.
In order to further increase the performance of the retired battery Gradient utilization method, in another kind specific implementation of the invention
In mode, the retired battery is retired ferric phosphate lithium cell packet.The LiFePO4 of test discovery Prospect of EVS Powered with Batteries
Lithium ion battery with high security, environmental suitability it is strong and many advantages, such as have extended cycle life, after retired from electric car,
Remain to micro-grid energy storage system relatively mild for operating condition, relatively low to battery performance requirements, therefore, retired LiFePO4
Lithium ion battery is the preferred object that echelon utilizes.
The present invention also provides a kind of retired battery echelons to utilize system, as shown in Figure 1, including the energy storage system of communication connection
System and energy management unit.Specifically, the energy-storage system is that 570~832.2V battery cluster is constituted by several operating voltages, institute
If stating battery cluster includes dry cell batteries in parallel；The battery pack includes concatenated retired battery, PCS and monitoring unit；It is described
Energy management unit carries out charge and discharge for controlling the energy-storage system.
It should be noted that the step in retired battery Gradient utilization method provided by the invention, can use and be based on moving back
Labour battery echelon is achieved using module corresponding in system, device etc., and those skilled in the art are referred to the system
Technical solution realize that the step process of the method, i.e., the embodiment in the described system can be regarded as realizing the method
Preference, it will not be described here.
Based on whole design as above, following embodiments carry out specifically a portion concrete application under the design
It is bright.
Embodiment 2
The present embodiment is related to a kind of retired battery echelon utilization, specifically includes the following steps:
Step 1: appearance sorting
Appearance sorting, particular exam method are as follows: good in light are carried out to the ferric phosphate lithium ion battery of recycling first
Under conditions of, check whether the unqualified phenomenons such as breakage, deformation, spot, leakage, and whether clear battery identification is correct.It is right
In the underproof retired battery of visual examination, not recycle；For the retired battery of visual examination qualification, step 2 is carried out (such as
Fig. 2).
Step 2: history data sorting
The BMS protection board for connecting retired battery, reads its history data, carries out retired battery history operation data point
Choosing；There is charge and discharge electrographic recording for having to overcharge under record, over-discharge record, superheat state and can not read moving back for history data
Battery is used as a servant, is not recycled；For no above situation and the good retired battery of history log, step 3 is carried out.
Wherein, battery BMS protection board function are as follows: voltage and current acquisition, temperature acquisition, overcurrent protection overcharge protection, over-discharge
Protection, water inlet protection, temperature protection, breaking protection, short-circuit protection, power device error protection, battery failures second protection, in advance
Electric discharge, electric voltage equalization, resume function, battery capacity instruction, battery status instruction/BMS abnormality alarming instruction, communication function etc.
(such as Fig. 2).
Step 3: core holds detection and cell health state calculates
386 retired battery packs (720V 600Ah) that step 2 is selected connect battery core one by one and hold detection dress
It sets, detects retired battery current capacities.The health status that battery rated capacity calculates retired battery is obtained in conjunction with battery nameplate, and
Record the health status SOH of each battery.
Step 4, retired battery group
The SOH of each retired battery is calculated according to above formula, the battery pack of different SOH is grouped by SOH.SOH is greater than
80% is A group, and SOH is B group between 70%-80%, and SOH is C group between 65%-70%.Its specific healthy shape
State and the corresponding retired number of batteries of the health status are as follows:
A group (SOH >=80%): 52；
B group (70%≤SOH < 80%): 311；
C group (65% < SOH < 70%) 21；
D group (SOH≤65%): 2.
Step 5: echelon utilizes
Fig. 2 shows the schematic diagrames that retired battery echelon utilizes.Same group of every 15 battery pack is connected in parallel to be formed
Battery cluster gathers enough 15 using the same group of battery that last time recycles with volume residual after organizing battery composition battery cluster less than 15
Composition battery variety of moduli or fully charged preservation reenter cluster use when recycling battery next time.The voltage rating of each battery cluster is
The battery cluster of 720V, A group composition is averaged current capacities as 7200Ah, and the stored energy capacitance of each battery cluster is 5.184MWh；B group group
At the battery cluster current capacities that are averaged be 6700Ah, the stored energy capacitance of each battery cluster is 4.824MWh；The battery cluster of C group composition
Average current capacities are 6000Ah, and the stored energy capacitance of each battery cluster is 4.32MWh.Energy storage system is constituted by battery cluster parallel connection again
System.Battery cluster operating voltage 655.8V-808.8V meets the operating voltage > 570V requirement of MW grades of energy-storage systems of 832.2V >.
Fig. 4 shows the system topological figure that the retired battery echelon of the present embodiment utilizes.Specifically,
Battery composition energy-storage system is utilized by echelon in step 5, the direct current of energy-storage system is converted by PCS and is struck a bargain
The three-phase alternating current for flowing 380V, can be incorporated to power distribution network by transformer, convey electric energy, or the electricity using power distribution network to power distribution network
It can be that battery charges；Again electric energy can be provided to work normally production in garden.
Energy-storage system, PCS and transformer are connected with monitoring system and background control system is connect, convenient for staff according to
Actual demand to energy-storage system charge and discharge in garden, with power distribution network is grid-connected or the control such as off-network.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of retired battery Gradient utilization method, it is characterised in that: the retired battery Gradient utilization method includes following step
Suddenly
A, retired battery sorting: retired battery is sorted according to the cell health state parameter SOH standard determined, judges institute
State whether retired battery can carry out echelon utilization；If so, thening follow the steps b；If it is not, then scrapping processing；
B, retired battery group: the retired battery is grouped according to the retired cell classification standard determined；
C, retired battery composition energy-storage system: same group of retired battery pack is connected to form basic energy storage with PCS, monitoring unit
Unit；Several basic energy-storage units parallel connections are formed into battery cluster；Several battery cluster parallel connections are formed what power did not waited
Energy-storage system；By the energy-storage system and energy management unit communication connection；Wherein, the operating voltage of the battery cluster is 570
~832.2V.
2. retired battery Gradient utilization method according to claim 1, it is characterised in that: the retired battery echelon utilizes
Method further includes that the energy management unit control discharge-rate is 0.2C-2C, depth of discharge 60%-90%.
3. retired battery Gradient utilization method according to claim 1, it is characterised in that: step a includes
A1, the sorting of retired battery appearance: the appearance standard according to the retired battery determined is sorted, and is judged that can it enter and is moved back
Use as a servant the sorting of battery history data；
A2, the sorting of retired battery history operation data: the history run number of the retired battery sorted through retired battery appearance is obtained
According to the history data standard according to the retired battery determined is sorted, and judges that can it enter retired battery health shape
State sorting；
A3, retired battery current capacities value is obtained based on battery core appearance detection device；Calculate retired cell health state parameter
SOH。
4. retired battery Gradient utilization method according to claim 3, it is characterised in that: the appearance standard are as follows: appearance
It is intact, battery identification is clearly correct, and without it is damaged, without deformation, without spot, without leakage.
5. retired battery Gradient utilization method according to claim 3, it is characterised in that: the history data standard
Are as follows: without overcharge record, without without charge and discharge electrographic recording and history data can be read under over-discharge record, superheat state.
6. retired battery Gradient utilization method according to claim 3, it is characterised in that: the retired battery to be detected
History data is no less than 10.
7. the retired battery Gradient utilization method according to any one of claim 3-6, it is characterised in that: the battery is strong
Health state parameter SOH is not less than 65%.
8. retired battery Gradient utilization method according to claim 7, it is characterised in that: according to the battery in step b
Health parameter SOH is grouped retired battery, specifically:
If SOH >=80%, retired battery is A group；
If 70%≤SOH < 80%, retired battery is B group；
If 65%≤SOH < 70%, retired battery is C group；
If SOH < 65%, retired battery is D group, is rejected.
9. a kind of echelon of retired battery utilizes system, it is characterised in that: the echelon of the retired battery includes logical using system
Interrogate the energy-storage system of connection and carry out the energy management unit of charge and discharge for controlling the energy-storage system, the energy-storage system by
Several operating voltages are 570~832.2V battery cluster composition, if the battery cluster includes dry cell batteries in parallel；The battery pack
Including concatenated retired battery, PCS and monitoring unit.
10. the echelon of retired battery according to claim 9 utilizes system, it is characterised in that: the energy management unit
Control discharge-rate is 0.2C-2C, depth of discharge 60%-90%.
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