CN107225104A - A kind of method for separating of battery - Google Patents
A kind of method for separating of battery Download PDFInfo
- Publication number
- CN107225104A CN107225104A CN201710625524.3A CN201710625524A CN107225104A CN 107225104 A CN107225104 A CN 107225104A CN 201710625524 A CN201710625524 A CN 201710625524A CN 107225104 A CN107225104 A CN 107225104A
- Authority
- CN
- China
- Prior art keywords
- battery
- discharge
- voltage
- fill
- internal resistance
- Prior art date
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- 230000000875 corresponding Effects 0.000 claims abstract description 20
- 241001081830 Degeneriaceae Species 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 238000000034 methods Methods 0.000 description 5
- 239000005955 Ferric phosphate Substances 0.000 description 4
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K Iron(III) phosphate Chemical compound data:image/svg+xml;base64,<?xml version='1.0' encoding='iso-8859-1'?>
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- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 4
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound 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[Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
Abstract
Description
Technical field
The present invention relates to battery detecting sorting technology field, more particularly to a kind of method for separating of battery.
Background technology
It is well known that with the extensive utilization of fossil fuel, environmental pollution already turns into worldwide problem.Northern large area Haze, urban heat land effect, the disaster such as acid rain has beaten alarm bell, so being on the rise at this again and again to the mankind Environmental problem under, finding a kind of target of the environmentally friendly energy has become very urgent.Environmental pollution, energy crisis, just Urge on scientific research field to look for new energy to solve this two large problems.
Battery, storage and conversion carrier as a kind of electric energy, because it can have on the premise of environment is had little influence on High electric energy conversion efficiency and by concern widely.At present, from mini electrical equipments such as mobile phone, instrument, to electronic The large-scale energy storage devices such as automobile, large-scale energy storage cabinet, lithium ion battery is high by its specific energy density, has extended cycle life, can store The advantages of time is long, very important status is seized of in new energy field, and just because it integrates weight advantage, lithium ion Battery not only turns into the focus of research, more will be leading as future market.
Compared to battery, the structure of battery pack is complex, and is not the scaling of battery, the battery of same model Had differences in production technology and use environment, cause battery more or less to exist in terms of capacity, internal resistance and voltage platform not Uniformity, and it is this it is inconsistent can not eliminate, and lithium battery group properties quality it is quite severe for battery with two side terminals Carve.
There is practice to confirm, battery of the monomer cycle-index at 1000 times or so, its rear actual cycle life is less than 200 in groups It is secondary.And be not that a certain batteries cycle life is decayed to 200 times or so in battery pack the reason for cause this phenomenon, but by In battery pack on the basis of security is met, between battery the difference of dump energy make the capacity of battery pack by dump energy most The limitation of the minimum battery of small and chargeable electricity.And with the expansion of dump energy difference, the capacity of battery pack is quickly reached The capacity cutoff of its end-of-life.
To sum up, battery pack is different from the critical problem of battery and is attributed to battery with two side terminals problem.So there is provided one The method for separating of the consistent monomer electricity of performance can be tuned out by planting, and be the technical problem of those skilled in the art's urgent need to resolve.
The content of the invention
The technical problem to be solved in the present invention is:A kind of method for separating of battery is provided, it is consistent that it can sub-elect performance Battery.
What the solution of the present invention was realized in:A kind of method for separating of battery, comprises the following steps:
S1, the instantaneous charging DC internal resistance and instantaneous discharge DC internal resistance for calculating battery to be sorted, will instantaneously charge direct current The battery that internal resistance is more than instantaneous discharge DC internal resistance is divided into one group, and other batteries are divided into another set;
S2, the battery after step S1 sortings is subjected to charge and discharge cycles test, measures battery actual capacity, and according to The a certain percentage of battery rated capacity is interval as sorting, and capacity sorting is carried out to battery;
S3, by the battery after step S2 sortings, according to the dynamic electric voltage value corresponding to battery SOC, substitute into such as subscript Quasi- difference formula, is sorted again to battery,
Wherein, N is arbitrary natural number, and μ is the average value of magnitude of voltage corresponding to each SOC points, χiFor other electricity of same batch Each magnitude of voltage corresponding to the SOC of pond.
Another technical scheme of the present invention is on above-mentioned basis, in the step S1, if battery is by shelving shape When state is changed into charging and discharging state, the instantaneous charging DC internal resistance value of battery is:
RFill=(UFill-UPut)/IFill
Wherein, UFillFor the voltage of charged state, IFillFor current data, UPutFor shelved voltage;
If battery is changed into charging and discharging state from the state of shelving, the instantaneous discharge DC internal resistance value of battery is:
RPut=(UPut-UPut)/IPut
Wherein, UPutFor the voltage of discharge condition, IPutFor current data, UPutFor shelved voltage.
Another technical scheme of the present invention is on above-mentioned basis, in the step S1, when battery is directly by putting When electricity is changed into charging, the battery DC internal resistance that instantaneously charges is:
RFill=(UFill-UPut)/(IFill-IPut)
Wherein, UPutFor discharge voltage, IPutFor electric current, UFillFor charging voltage, IFillFor electric current;
When battery is directly changed into electric discharge from charging, battery instantaneous discharge DC internal resistance is:
RPut=(UPut-UFill)/(IPut-IFill)
Wherein, UPutFor discharge voltage, IPutFor electric current, UFillFor charging voltage, IFillFor electric current.
Another technical scheme of the present invention is on above-mentioned basis, and charge and discharge cycles are being carried out in the step S2 Before test, also battery is pre-processed, specifically, battery to be sorted is placed in into temperature for 10~50 DEG C, atmospheric pressure is 0.5 ~5 standard atmospheric pressures, relative humidity makes battery surface temperature in preset temperature range is interval under the conditions of 5%~95%.
Another technical scheme of the present invention is on above-mentioned basis, and battery is pre-processed in the step S2 When, battery surface temperature is in the range of preset temperature ± 2 DEG C.
Another technical scheme of the present invention is on above-mentioned basis, and discharge and recharge is carried out to battery in the step S2 Loop test comprises the following steps:
S11, is shelved, and battery is shelved 5-20 minutes;
S12, with constant-current charge to battery cutoff voltage, then turns to constant-voltage charge to cell cutoff electric current;
S13, is shelved, and battery is shelved 5-20 minutes;
S14, constant-current discharge;
S15, circulation terminates, circulation is multiple since being circulated S11 to S14 rings;
S16, is shelved, and battery is shelved 5-20 minutes;
S17, first constant-current charge then turns to pressure and charges to cell cutoff electric current to battery cutoff voltage;
S18, terminates.
Another technical scheme of the present invention is on above-mentioned basis, with battery rated capacity in the step S2 0.1%~10% is interval as sorting.
Another technical scheme of the present invention is on above-mentioned basis, in the step S1, if the wink of two pieces of batteries When charging DC internal resistance differ more than 3 times or instantaneous discharge DC internal resistance difference more than 3 times, then by this two pieces of battery-allocateds to not Same group.
Another technical scheme of the present invention is on above-mentioned basis, in the step S3, and the σ values are battery generation Enter standard deviation formula and calculate obtained value, battery is sorted again according to the big minizone of σ values.
Another technical scheme of the present invention is that on above-mentioned basis battery to be sorted is just to go out in the step S1 The new battery of factory or secondary utilization battery.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below:
In the method for sorting battery of the present invention, it is by the instantaneous internal resistance of discharge and recharge, and battery capacity, battery is different Three reference quantities of SOC corresponding voltages value, are sorted to battery, can accurately, reliably sub-elect the consistent battery of parameter, with Just the good battery of uniformity is assembled into battery pack, it is ensured that match the cycle life and charge-discharge performance of battery pack so that Battery pack can be safe, stable, is efficiently power supply for electrical equipment, increases the cycle life and charge-discharge performance of battery pack, from And reach the purpose of reduction battery pack cost.
Brief description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.
Fig. 1 is the flow chart of the method for separating of battery in one embodiment of the present invention;
Its charge and discharge electrical schematic when Fig. 2 is battery sorting.
Embodiment
The present invention will be described in detail below in conjunction with the accompanying drawings, and the description of this part is only exemplary and explanatory, should not There is any restriction effect to protection scope of the present invention.In addition, description of the those skilled in the art according to this document, can be right Feature in this document in embodiment and not in be the same as Example carries out respective combination.
Term " first ", " second ", " the 3rd " " in description and claims of this specification and above-mentioned accompanying drawing The (if present)s such as four " are for distinguishing similar object, without for describing specific order or precedence.It should manage The data that solution is so used can be exchanged in the appropriate case, so as to embodiments of the invention described herein, for example can be with Order in addition to those for illustrating or describing herein is implemented.In addition, term " comprising " and " having " and their times What is deformed, it is intended that covering is non-exclusive to be included, for example, contain the process of series of steps or unit, method, system, Product or equipment are not necessarily limited to those steps clearly listed or unit, but may include not list clearly or for The intrinsic other steps of these processes, method, product or equipment or unit.
The embodiment of the present invention is as follows, as shown in figure 1, a kind of method for separating of battery, comprises the following steps:
S1, the instantaneous charging DC internal resistance and instantaneous discharge DC internal resistance for calculating battery to be sorted, will instantaneously charge direct current The battery that internal resistance is more than instantaneous discharge DC internal resistance is divided into one group, and other batteries are divided into another set;
S2, the battery after step S1 sortings is subjected to charge and discharge cycles test, measures battery actual capacity, and according to The a certain percentage of battery rated capacity is interval as sorting, and capacity sorting is carried out to battery;
S3, by the battery after step S2 sortings, according to the dynamic electric voltage value corresponding to battery SOC, substitute into such as subscript Quasi- difference formula, is sorted again to battery,
Wherein, N is arbitrary natural number, and μ is the average value of magnitude of voltage corresponding to each SOC points, χiFor other electricity of same batch Each magnitude of voltage corresponding to the SOC of pond.
On the basis of above-described embodiment, in another embodiment of the present invention, in the step S1, if battery is by shelving shape When state is changed into charging and discharging state, the instantaneous charging DC internal resistance value of battery is:
RFill=(UFill-UPut)/IFill
Wherein, UFillFor the voltage of charged state, IFillFor current data, UPutFor shelved voltage;
If battery is changed into charging and discharging state from the state of shelving, the instantaneous discharge DC internal resistance value of battery is:
RPut=(UPut-UPut)/IPut
Wherein, UPutFor the voltage of discharge condition, IPutFor current data, UPutFor shelved voltage.
On the basis of above-described embodiment, in another embodiment of the present invention, in the step S1, when battery is directly by putting When electricity is changed into charging, the battery DC internal resistance that instantaneously charges is:
RFill=(UFill-UPut)/(IFill-IPut)
Wherein, UPutFor discharge voltage, IPutFor electric current, UFillFor charging voltage, IFillFor electric current;
When battery is directly changed into electric discharge from charging, battery instantaneous discharge DC internal resistance is:
RPut=(UPut-UFill)/(IPut-IFill)
Wherein, UPutFor discharge voltage, IPutFor electric current, UFillFor charging voltage, IFillFor electric current.
On the basis of above-described embodiment, in another embodiment of the present invention, followed in the step S2 in progress discharge and recharge Before ring test, also battery is pre-processed, specifically, battery to be sorted is placed in into temperature for 10~50 DEG C, atmospheric pressure is 0.5~5 standard atmospheric pressure, relative humidity makes battery surface temperature interval in preset temperature range under the conditions of 5%~95% It is interior.
On the basis of above-described embodiment, in another embodiment of the present invention, battery is located in advance in the step S2 During reason, battery surface temperature is in the range of preset temperature ± 2 DEG C.
On the basis of above-described embodiment, in another embodiment of the present invention, charge and discharge is carried out to battery in the step S2 Electric loop test comprises the following steps:
S11, is shelved, and battery is shelved 5-20 minutes;
S12, with constant-current charge to battery cutoff voltage, then turns to constant-voltage charge to cell cutoff electric current;
S13, is shelved, and battery is shelved 5-20 minutes;
S14, constant-current discharge;
S15, circulation terminates, circulation is multiple since being circulated S11 to S14 rings;
S16, is shelved, and battery is shelved 5-20 minutes;
S17, first constant-current charge then turns to pressure and charges to cell cutoff electric current to battery cutoff voltage;
S18, terminates.
On the basis of above-described embodiment, in another embodiment of the present invention, with battery rated capacity in the step S2 It is 0.1%~10% interval as sorting.
On the basis of above-described embodiment, in another embodiment of the present invention, in the step S1, if the wink of two pieces of batteries When charging DC internal resistance differ more than 3 times or instantaneous discharge DC internal resistance difference more than 3 times, then by this two pieces of battery-allocateds to not Same group.
On the basis of above-described embodiment, in another embodiment of the present invention, in the step S3, the σ values are battery Substitute into standard deviation formula and calculate obtained value, battery is sorted again according to the big minizone of σ values.
On the basis of above-described embodiment, in another embodiment of the present invention, battery to be sorted is firm in the step S1 The new battery or secondary utilization battery dispatched from the factory.
As shown in Fig. 2 its charge and discharge electrical schematic when being battery sorting, from the graph it can be seen that the pass of battery capacity and voltage System, wherein the curve of tendency gradually downward be discharge curve, i.e. battery with the increase of discharge capacity, battery terminal voltage gradually under Drop;Gradually upward curve is charging curve, i.e. battery with the increase of charge volume to tendency, and battery terminal voltage is gradually increasing.
Specific embodiment 1
Below with 26650 ferric phosphate lithium cell 100, rated capacity is to introduce this exemplified by 3Ah, nominal voltage 3.2V The method for separating of the described battery of invention.
(1) the instantaneous charging DC internal resistance and instantaneous discharge DC internal resistance of battery to be sorted are calculated, with a certain batch battery Momentary charging voltage in first measuring point of the last time charged state in charge and discharge cycles data is calculated as U1, charging electricity Stream is set to I1, the voltage of previous last measuring point for shelving state is set to U0, then charging of the battery under this SOC state Instantaneous DC internal resistance R1=(U1-U0)/I1;Similarly, the instantaneous discharge voltage in first measuring point of last time discharge condition It is set to U2, discharge current is set to I2, the voltage of previous last measuring point for shelving state is set to U3, then battery is in this SOC The instantaneous DC internal resistance R of electric discharge under state2=(U2-U3)/I2.Finally, by filling under the same state of each capacity batch battery Discharge instantaneous internal resistance data summarization, the instantaneous charging DC internal resistance of each battery is subtracted into instantaneous discharge DC internal resistance, difference is Positive is divided into one group, and the battery that the DC internal resistance that will instantaneously charge is more than instantaneous discharge DC internal resistance is divided into one group;Other batteries It is divided into another set, it is as shown in table 1 below.
It should be noted that the problem of some batteries are due to processing causes the instantaneous discharge and recharge DC internal resistance that it is measured It is all very big, but its difference still very little, then this kind of battery should be weeded out from the battery pack of sorting, such as in identical capacity region Between in, there is such two pieces of batteries, first piece:Instantaneous internal charging resistance is 0.002, and instantaneous discharge internal resistance is 0.001;Second block of electricity Pond:Instantaneous internal charging resistance is 0.01, and instantaneous discharge internal resistance is 0.009, then this two pieces of batteries can not be definitely assigned in one group. In order to avoid it is such a the occurrence of, instantaneous discharge and recharge DC internal resistance can be set in certain interval (3-10 times), if discharge and recharge Internal resistance value exceedes pre-set interval value, then the label battery does not consider partial volume.
Test the meaning of instantaneous discharge and recharge DC internal resistance:
Instantaneous charging DC internal resistance is significant for the voltage platform in battery charging process, is given in test system In battery charging process, its voltage tested is total voltage, i.e. internal resistance of cell partial pressure and terminal voltage sum, so instantaneous charging DC internal resistance increase can cause voltage platform to rise;And instantaneous discharge DC internal resistance is for the voltage platform in battery discharge procedure Same significant, during test system charges the battery, its voltage tested is terminal voltage, is that total voltage subtracts Internal resistance of cell partial pressure is gone, during battery constant-current discharge, size of current is constant, if the internal resistance of cell increases, battery can be caused Internal resistance partial pressure increases, and reduces terminal voltage, therefore the voltage platform reduction during guiding discharge.
So, to make the voltage platform of battery pack stable, it is necessary to which the battery for constituting battery pack possesses similar instantaneous fill Electric discharge DC internal resistance, so by instantaneous discharge and recharge DC internal resistance, as the foundation of sorting, being very important.
(2) battery after being handled through step (1), is placed in 25 DEG C, 1 standard atmospheric pressure, the environment atmosphere of 50% relative humidity Under enclosing, maintained until battery surface temperature is at 25 DEG C ± 2 DEG C, with battery test system, charge and discharge cycles test is carried out to battery.
The job step that battery carries out charge and discharge cycles test is included:
The first step:Shelve, 10 minutes time;
Second step;With 0.3C constant-current charges to battery cutoff voltage 3.65V, 3.65V constant-voltage charges, cut-off electricity are then turned to Flow for 0.05C;
3rd step:Shelve, 10 minutes time;
4th step:Constant-current discharge, discharge current is 0.5C;
5th step:Circulation, terminates since being circulated the first step to the circulation of the 4th step, and cycle-index is three times;
6th step:Shelve, 10 minutes time;
7th step:First constant-current charge then turns to 3.65V constant-voltage charges to battery cutoff voltage 3.65V, and cut-off current is 0.05C;
8th step:Terminate.
With the constant-current discharge capacity of last circulation, battery actual capacity is counted as, with the 2% of battery rated capacity 3Ah, i.e., 0.06Ah is interval for sorting, for example:3.00~3.06Ah, 2.94~3.00Ah, 2.88~2.94Ah are that different capabilities are interval, such as Shown in table 1 below.
The 3Ah ferric phosphate lithium cells part partial volume data list of table 1
(3) in order that voltage platform is more they tended to unanimously, on the basis of upper once sorting, then to investigate corresponding to SOC points Discharge and recharge real-time voltage.The rated capacity of battery is 3Ah, and it is 100%SOC to take 3Ah, then draw 10%, 20%, 30%, 40%th, 50%, 60%, 70%, 80%, the capacity corresponding to 90%SOC be 0.3Ah, 0.6Ah, 0.9Ah, 1.2Ah, 1.5Ah, 1.8Ah、2.1Ah、2.4Ah、2.7Ah.A batteries are randomly selected in the battery to be sorted, the above 9 is found by data Magnitude of voltage corresponding to individual capability value, and its average is sought, it is designated as μ.Then, the discharge and recharge corresponding to other battery capacities is found Real-time voltage, is designated as χi, standard deviation formula is substituted into respectively:
Draw the σ values of battery to be sorted.From the point of view of practical operation, σ value is hovered 0.040~0.048 or so, by σ values Battery can be divided into 8 groups, i.e., from 8 groups of 0.040~0.041 to 0.047~0.048.It should be noted that due to every kind of lithium The model of ion battery, capacity, the difference such as performance can cause σ values to have very big difference, so should be by battery during sorting Concrete condition is determined.
Specific embodiment 2
Below with 25Ah ferric phosphate lithium cells, rated capacity is to introduce institute of the present invention exemplified by 25Ah, nominal voltage 3.2V The method for separating for the battery stated.
(1) sorting of instantaneous discharge and recharge DC internal resistance is carried out to battery, instantaneous discharge and recharge DC internal resistance method and tool is calculated Body embodiment 1 is identical., will be every afterwards by the instantaneous internal resistance data summarization of discharge and recharge under the same state of each capacity batch battery The instantaneous charging DC internal resistance divided by instantaneous discharge DC internal resistance of individual battery, its business are divided into one group more than 1, will instantaneously charge The battery that DC internal resistance is more than instantaneous discharge DC internal resistance is divided into one group;Other batteries are divided into another set, as shown in table 2 below.
(2) battery after being handled through step (1), is placed in 20 DEG C, 1 standard atmospheric pressure, the environment atmosphere of 40% relative humidity Under enclosing, maintained until battery surface temperature is at 20 DEG C ± 2 DEG C, with battery test system, charge and discharge cycles test is carried out to battery.
Job step is set:
The first step:Shelve, 10 minutes time;
Second step;With 0.5C constant-current charges to battery cutoff voltage 3.65V, 3.65V constant-voltage charges, cut-off electricity are then turned to Flow for 0.05C;
3rd step:Shelve, 10 minutes time;
4th step:Constant-current discharge, discharge current is 1C;
5th step:Circulation, terminates since being circulated the first step to the circulation of the 4th step, and cycle-index is three times;
6th step:Shelve, 10 minutes time;
7th step:With 0.5C constant-current charges to battery cutoff voltage 3.65V, 3.65V constant-voltage charges, cut-off electricity are then turned to Flow for 0.05C;
8th step:Terminate.
The 25Ah ferric phosphate lithium cells part partial volume data list of table 2
With the constant-current discharge capacity of last circulation, battery actual capacity is counted as, with the 2% of battery rated capacity 25Ah, That is 0.5Ah is interval for sorting, for example:24.0~24.5Ah, 24.5~25Ah, 25~25.5Ah are that different capabilities are interval, as above Shown in table 2.
(3) on the basis of capacity sorting and the instantaneous DC internal resistance sorting of discharge and recharge, then to investigate filling corresponding to SOC points Discharge real-time voltage, and the rated capacity of battery is 25Ah, and it is 100%SOC to take 25Ah, then draw 15%, 25%, 35%, 45%th, 55%, 65%, 75%, the capacity corresponding to 85%SOC be 3.75Ah, 6.25Ah, 8.75Ah, 11.25Ah, 13.75Ah、16.25Ah、18.75Ah、21.25Ah.A batteries are randomly selected in the battery to be sorted, by its SOC institute Corresponding magnitude of voltage is designated as μ1、μ2、μ3、μ4、μ5、μ6、μ7、μ8, other sorting battery SOCs corresponding to magnitudes of voltage be designated as χ1、χ2、 χ3、χ4、χ5、χ6、χ7、χ8.Substitute into standard deviation formula:
Draw the σ values of battery to be sorted.From the point of view of practical operation, σ value is hovered 0.03~0.07 or so, can by σ values Battery is divided into 4 groups, i.e., from 4 groups of 0.03~0.04 to 0.06~0.07.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below:
In the method for sorting battery of the present invention, it is by battery capacity, the instantaneous internal resistance of discharge and recharge, and battery is different Three reference quantities of SOC corresponding voltages value, are sorted to battery, can accurately, reliably sub-elect the consistent battery of parameter, with Just the good battery of uniformity is assembled into battery pack, it is ensured that match the cycle life and charge-discharge performance of battery pack so that Battery pack can be safe, stable, is efficiently power supply for electrical equipment, increases the cycle life and charge-discharge performance of battery pack, from And reach the purpose of reduction battery pack cost.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.
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