CN107907836A - A kind of lithium-ion-power cell method for evaluating consistency and system - Google Patents
A kind of lithium-ion-power cell method for evaluating consistency and system Download PDFInfo
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- CN107907836A CN107907836A CN201711161785.0A CN201711161785A CN107907836A CN 107907836 A CN107907836 A CN 107907836A CN 201711161785 A CN201711161785 A CN 201711161785A CN 107907836 A CN107907836 A CN 107907836A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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Abstract
The present invention provides a kind of lithium-ion-power cell method for evaluating consistency, including battery cell is assembled into the static conformance evaluation before battery system and battery cell is assembled into the dynamic conformance evaluation after battery system；The static conformance evaluation includes range of capacity, tolerance, pressure difference and internal resistance difference Conformance Assessment, and the dynamic conformance evaluation includes voltage standard difference Conformance Assessment and the very poor Conformance Assessment of voltage.The present invention controls static conformance before single battery dress bag and the dynamic conformance after dress bag at the same time, can farthest ensure the uniformity that battery is used in vehicle, effectively reduce the performance difference in battery system between monomer, ensure battery.
Description
Technical field
The present invention relates to a kind of power battery method for evaluating consistency and system, and in particular to a kind of lithium-ion-power cell
Method for evaluating consistency and system.
Background technology
With technology, gradually ripe, cost declines to a great extent and the combined influence of the factor such as incentive policy and fuel economy regulation,
Lithium ion battery will be mainstream power battery at 5~10 years from now on.In general, vehicle lithium-ion power battery system is by tens
A or hundreds of thousands of a battery cells are composed by series-parallel mode.Because there is " wooden pail effect " in battery performance,
The performance of the key performances such as capacity, power in by battery system each monomer inconsistency influenced it is very big, in discharge and recharge, battery system
The inconsistency of each monomer causes the performance indicators such as battery capacity and power to decline in system, so as to directly affect the pure electric vehicle of vehicle
The index such as continual mileage and dynamic property.Especially in low temperature, the inconsistency of battery cell not only influences battery performance, Er Qiehui
Cause the probability increase of battery triggering fault threshold, if control is bad, or even there are security risk.
In order to ensure the uniformity of monomer, battery enterprise generally use multi-parameter combo method and dynamic characteristic match somebody with somebody prescription
Method carries out monomer Selection.Multi-parameter combo method is by capacity, pressure difference, internal resistance are poor, self-discharge rate, voltage platform etc. are multiple exterior joins
Number sieve menu body；Dynamic characteristic combo method is by carrying out similarity analysis to charging and discharging curve and comparing, discharge and recharge
The similar combination of curve is assembled into battery system.
At present, the evaluation method on lithium-ion-power cell uniformity is proposed by battery enterprise more, is concentrated mainly on list
Body is assembled into the conformity classification before system.From vehicle using angle to being assembled into battery system discharge and recharge after battery system when it is each
The coherence request and evaluation method of monomer are less.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of lithium-ion-power cell method for evaluating consistency and system, this
Invention controls static conformance before single battery dress bag and the dynamic conformance after dress bag at the same time, can farthest ensure
The uniformity that battery is used in vehicle, effectively reduces the performance difference in battery system between monomer, ensures battery.
The technical solution adopted by the present invention is：
One embodiment of the invention provides a kind of lithium-ion-power cell method for evaluating consistency, including battery cell is assembled into
Static conformance evaluation and battery cell before battery system are assembled into the dynamic conformance evaluation after battery system；The static state
Conformance Assessment includes range of capacity, tolerance, pressure difference and internal resistance difference Conformance Assessment, specifically includes following steps：Obtain battery
The capacity of all battery cells, 50%SOC open-circuit voltages, AC internal Resistance before system assembles；Based on acquired all battery lists
The capacity of body, determines range of capacity, minimum capacity and the maximum capacity of all battery cells, and is based on the minimum capacity and institute
State maximum capacity and obtain the tolerance of all battery cells；Obtained range of capacity and tolerance is specified with battery system respectively
Capacity is compared, and judges whether the battery system meets range of capacity coherence request and tolerance coherence request；It is based on
The open-circuit voltage of acquired all battery cells, determines the difference in open circuit voltage of all battery cells；By identified open circuit electricity
Pressure difference judges whether the battery system meets pressure difference coherence request compared with preset pressure threshold value；Based on acquired
All battery cells AC resistance, determine all battery cells AC internal Resistance difference and AC internal Resistance average value；Will
Identified AC internal Resistance is poor compared with the average value of the AC internal Resistance, judges whether the battery system meets internal resistance
Poor coherence request；The dynamic conformance evaluation includes voltage standard difference Conformance Assessment and the very poor Conformance Assessment of voltage,
Specifically include following steps：By the battery system 1C constant-current charges to defined blanking voltage, constant-voltage charge to current reduction
To 0.05C；Battery system after constant-current charge is stood into preset time；Battery system 1C constant currents after standing preset time are put
Electricity is to defined blanking voltage；100%SOC~20%SOC and 20%SOC~0%SOC sections battery system when calculating 1C electric discharges
The voltage standard difference and voltage of interior all monomers are very poor；By the voltage standard difference calculated not with 100%SOC~20%SOC
The preset standard difference in section and the preset standard difference in 20%SOC~0%SOC sections are compared, and judge that the battery system is
It is no to meet voltage standard difference coherence request；The voltage pole difference calculated is not pre- with 100%SOC~20%SOC sections
If very poor and 20%SOC~0%SOC sections it is default it is very poor be compared, judge whether the battery system meets voltage pole
Poor coherence request.
Alternatively, by obtained range of capacity and tolerance respectively compared with the rated capacity of battery system, judge
Whether the battery system meets that range of capacity coherence request and tolerance coherence request specifically include：By obtained capacity
Scope is compared with the rated capacity of battery system, if the range of capacity is located at the preset ratio model of the rated capacity
Between enclosing, it is determined that the battery system meets range of capacity coherence request；By the specified of obtained tolerance and battery system
Capacity is compared, if the tolerance is not more than the preset ratio of the rated capacity, it is determined that the battery system meets to hold
Poor coherence request.
Alternatively, the preset ratio scope is 105%~110%；The preset ratio is 0.675%.
Alternatively, by identified difference in open circuit voltage compared with preset pressure threshold value, judge that the battery system is
It is no to meet that pressure difference coherence request includes：By identified difference in open circuit voltage compared with preset pressure threshold value, if described
Difference in open circuit voltage is less than the preset pressure threshold value, it is determined that the battery system meets pressure difference coherence request.
Alternatively, the preset pressure threshold value is 5mV.
Alternatively, it is identified AC internal Resistance is poor compared with the average value of the AC internal Resistance, judge the electricity
Whether cell system meets that internal resistance difference coherence request includes：Identified AC internal Resistance is poor with the average value of the AC internal Resistance
It is compared, if AC internal Resistance difference is no more than the preset ratio of the average value of the AC internal Resistance, it is determined that the battery
System meets internal resistance difference coherence request.
Alternatively, the preset ratio of the average value of the AC internal Resistance is 15%.
Alternatively, by the voltage standard difference calculated not with the preset standard in 100%SOC~20%SOC sections difference and
The preset standard difference in 20%SOC~0%SOC sections is compared, and judges whether the battery system meets voltage standard poor one
Cause property requires to include：By the voltage standard difference calculated not with the preset standard in 100%SOC~20%SOC sections difference and
The preset standard difference in 20%SOC~0%SOC sections is compared, if the voltage standard difference calculated is respectively smaller than 100%
The preset standard difference in SOC~20%SOC sections and the preset standard in 20%SOC~0%SOC sections are poor, it is determined that the battery
System meets voltage standard difference coherence request；By the voltage pole difference calculated not with 100%SOC~20%SOC sections
It is default very poor and 20%SOC~0%SOC sections it is default it is very poor be compared, judge whether the battery system meets voltage
Very poor coherence request includes：By the voltage pole difference calculated not with the default very poor of 100%SOC~20%SOC sections and
20%SOC~0%SOC sections it is default it is very poor be compared, if the voltage pole difference calculated be respectively smaller than 100%SOC~
Default very poor and 20%SOC~0%SOC sections in 20%SOC sections it is default very poor, it is determined that the battery system meets electric
Press very poor coherence request.
Alternatively, the preset standard in 100%SOC~20%SOC sections is poor pre- with 20%SOC~0%SOC sections
If standard difference Wei not 5mV and 100mV, the default very poor and 20%SOC~0%SOC in 100%SOC~20%SOC sections
The default very poor respectively 30mV and 300mV in section.
Another embodiment of the present invention provides a kind of lithium-ion-power cell Conformance Assessment system, including static conformance is commented
Valency subsystem and dynamic conformance Evaluation subsystem；Wherein, it is consistent to include range of capacity for the static conformance Evaluation subsystem
Property evaluation module, tolerance Conformance Assessment module, pressure difference Conformance Assessment module and internal resistance difference Conformance Assessment module；The appearance
The capacity that scope Conformance Assessment module is used for all battery cells based on acquisition is measured, determines the capacity model of all battery cells
Enclose, and by obtained range of capacity compared with the rated capacity of battery system, judge whether the battery system meets
Range of capacity coherence request；The tolerance Conformance Assessment module is used for the capacity of all battery cells based on acquisition, really
The minimum capacity and the maximum capacity of fixed all battery cells, and institute is obtained based on identified minimum capacity and maximum capacity
There is the tolerance of battery cell, and by resulting tolerance compared with the rated capacity of battery system, judge the battery system
Whether system meets tolerance coherence request；The pressure difference Conformance Assessment module is used for all battery cells based on acquisition
50%SOC open-circuit voltages, determine the difference in open circuit voltage of all battery cells, and by identified difference in open circuit voltage and preset pressure
Threshold value is compared, and judges whether the battery system meets pressure difference coherence request；The internal resistance difference Conformance Assessment module
For the AC resistance of all battery cells based on acquisition, the AC internal Resistance difference and AC internal Resistance of all battery cells are determined
Average value, it is and identified AC internal Resistance is poor compared with the average value of the AC internal Resistance, judge the battery system
Whether system meets internal resistance difference coherence request；The dynamic conformance Evaluation subsystem includes voltage standard difference Conformance Assessment mould
Block and the very poor Conformance Assessment module of voltage, wherein, when the voltage standard difference Conformance Assessment module is used to calculate 1C electric discharges
The voltage standard of all monomers is poor in 100%SOC~20%SOC and 20%SOC~0%SOC sections battery system, and will be counted
The voltage standard difference of calculation not with the preset standard in 100%SOC~20%SOC sections difference and 20%SOC~0%SOC sections
Preset standard difference is compared, and judges whether the battery system meets voltage standard difference coherence request；The voltage is very poor
100%SOC~20%SOC and 20%SOC~0%SOC sections battery system when Conformance Assessment module is used to calculate 1C electric discharges
The voltage of interior all monomers is very poor, and by default pole of the voltage pole difference calculated not with 100%SOC~20%SOC sections
Difference and 20%SOC~0%SOC sections it is default it is very poor be compared, judge whether the battery system meets voltage very poor one
Cause property requires.
Lithium-ion-power cell method for evaluating consistency provided in an embodiment of the present invention and system, from vehicle use,
Static conformance before system is assembled into including monomer and is assembled into dynamic conformance two parts after system.Monomer is assembled into system
It is preceding mainly to be passed through with monomer range of capacity, tolerance, pressure difference, the poor four parameter evaluation uniformity of internal resistance, monomer after being assembled into system
All lists in two discharge range battery systems of 100%SOC-20%SOC and 20%SOC-0%SOC in control 1C discharge processes
Bulk voltage is very poor and standard deviation, ensures uniformity of the battery system when vehicle uses.
Brief description of the drawings
Fig. 1 is the flow diagram of lithium-ion-power cell method for evaluating consistency provided in an embodiment of the present invention；
Fig. 2 is the flow diagram that the static conformance of the embodiment of the present invention is evaluated；
Fig. 3 is the flow diagram that the dynamic conformance of the embodiment of the present invention is evaluated；
Fig. 4 is the schematic diagram of monomer operating voltage standard deviation in the battery system of the embodiment of the present invention；
Fig. 5 is the schematic diagram that monomer operating voltage is very poor in the battery system of the embodiment of the present invention；
Fig. 6 is the structure diagram of lithium-ion-power cell Conformance Assessment system provided in an embodiment of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
Fig. 1 is the flow diagram of lithium-ion-power cell method for evaluating consistency provided in an embodiment of the present invention.Such as Fig. 1
Shown, the embodiment of the present invention provides a kind of lithium-ion-power cell method for evaluating consistency, including battery cell is assembled into battery
Static conformance evaluation and battery cell before system are assembled into the dynamic conformance evaluation after battery system.Wherein, it is described quiet
State Conformance Assessment includes range of capacity, tolerance, pressure difference and internal resistance difference Conformance Assessment, as shown in Fig. 2, static conformance is evaluated
Specifically include following steps：
S101, capacity, 50%SOC open-circuit voltages, the AC internal Resistance for obtaining all battery cells before battery system assembling.
S102, the capacity based on acquired all battery cells, determine the range of capacity of all battery cells, minimum appearance
Amount and maximum capacity, and the tolerance of all battery cells is obtained based on the minimum capacity and the maximum capacity.
S103, by obtained range of capacity and tolerance respectively compared with the rated capacity of battery system, judge institute
State whether battery system meets range of capacity coherence request and tolerance coherence request.
S104, the open-circuit voltage based on acquired all battery cells, determine the difference in open circuit voltage of all battery cells.
S105, by identified difference in open circuit voltage compared with preset pressure threshold value, whether judge the battery system
Meet pressure difference coherence request；
S106, the AC resistance based on acquired all battery cells, determine that the AC internal Resistance of all battery cells is poor
And the average value of AC internal Resistance.
It is S107, identified AC internal Resistance is poor compared with the average value of the AC internal Resistance, judge the battery
Whether system meets internal resistance difference coherence request.
The dynamic conformance evaluation includes voltage standard difference Conformance Assessment and the very poor Conformance Assessment of voltage, such as Fig. 3
Shown, dynamic conformance evaluation specifically includes following steps：
S201, by the battery system 1C constant-current charges to defined blanking voltage, constant-voltage charge to current reduction is extremely
0.05C。
S202, by after constant-current charge battery system stand preset time.In one example, the preset time is
30min, but be not limited thereto, other times can also be stood as needed.
S203, will stand the battery system 1C constant-current discharges after preset time to defined blanking voltage.
S204, calculate when 1C discharges and own in 100%SOC~20%SOC and 20%SOC~0%SOC sections battery system
Monomer voltage standard deviation and very poor.
S205, by the voltage standard difference calculated not with the preset standard in 100%SOC~20%SOC sections difference and
The preset standard difference in 20%SOC~0%SOC sections is compared, and judges whether the battery system meets voltage standard poor one
Cause property requires.
S206, by default very poor and 20%SOC of the voltage pole difference calculated not with 100%SOC~20%SOC sections
~0%SOC sections it is default it is very poor be compared, judge whether the battery system meets the very poor coherence request of voltage.
In the present invention, the capacity of all battery cells in step S101,50%SOC open-circuit voltages, AC internal Resistance and
Defined blanking voltage in step S201 is provided by the battery enterprise for providing battery system, the execution of step S102 to S107
There is no strict sequence.
Specifically, step S103 may particularly include following steps：
Step 1: by obtained range of capacity compared with the rated capacity of battery system, if the capacity model
Enclose between the preset ratio scope of the rated capacity, it is determined that the battery system meets range of capacity coherence request.
In the example of the present invention, the monomer capacity of monomer capacity and the vehicle setting produced according to battery enterprise
Lower limit, sets the preset ratio scope as 105%~110%.
Step 2: by obtained tolerance compared with the rated capacity of battery system, if the tolerance is not more than
The preset ratio of the rated capacity, it is determined that the battery system meets tolerance coherence request.
In the example of the present invention, the preset ratio can be 0.675%.
Further, step S105 may include：By identified difference in open circuit voltage compared with preset pressure threshold value, such as
Difference in open circuit voltage described in fruit is less than the preset pressure threshold value, it is determined that the battery system meets pressure difference coherence request.One
In a example, the preset pressure threshold value is 5mV, to ensure that battery lifts uniformity as far as possible before battery cell assembling.
Further, step S107 may include：By identified AC internal Resistance it is poor with the average value of the AC internal Resistance into
Row compares, if AC internal Resistance difference is no more than the preset ratio of the average value of the AC internal Resistance, it is determined that the battery system
System meets internal resistance difference coherence request.In one example, it is contemplated that current industry advanced level and battery enterprise manufacture level,
The preset ratio of the average value of the AC internal Resistance may be set to 15%.
Further, step S205 may include：By the voltage standard difference calculated not with 100%SOC~20%SOC areas
Between preset standard difference and the preset standard difference in 20%SOC~0%SOC sections be compared, if the voltage standard calculated
The preset standard that difference is respectively smaller than 100%SOC~20%SOC sections is poor poor with the preset standard in 20%SOC~0%SOC sections,
Then determine that the battery system meets voltage standard difference coherence request.
The preset standard difference in 100%SOC~20%SOC sections and 20%SOC~0%SOC areas in one example
Between preset standard difference be respectively 5mV and 100mV.
Further, step S206 may include：By the voltage pole difference calculated not with 100%SOC~20%SOC sections
Default very poor and 20%SOC~0%SOC sections it is default it is very poor be compared, if the voltage pole difference calculated is not small
In the default very poor and 20%SOC~0%SOC sections default very poor of 100%SOC~20%SOC sections, it is determined that the electricity
Cell system meets the very poor coherence request of voltage.
In one example, default very poor and 20%SOC~0%SOC sections in 100%SOC~20%SOC sections
It is default it is very poor be respectively 30mV and 300mV.
Below by taking the LP2714897 ternary system lithium ion batteries of rated capacity 37Ah as an example, Pack1 and Pack2 is chosen
The battery system of two bag 1P96S rated voltages 350V is illustrative to the evaluation method of the present invention.96 in battery system
Capacity, internal resistance, the open-circuit voltage of a monomer see the table below 1.
Table 1
First, the specific steps of battery system according to the invention preceding Conformance Assessment in groups analyze the quiet of this two bags battery
State uniformity, it may include following steps：
(1) by battery enterprise provide battery system in groups the capacity of preceding all monomers, 50%SOC open-circuit voltages, exchange in
Resistance, specifically sees the above table 1.
(2) 96 monomer ranges of capacity are between 39753mAh~39996mAh in Pack1, wherein minimum capacity
39.753Ah is the 107% of rated capacity 37Ah, and maximum capacity 39.996Ah is the 108% of rated capacity 37Ah, is satisfied by list
Requirement of the body capacity between 105%~110%；In Pack2 96 monomer ranges of capacity for 39563mAh~39905mAh it
Between, wherein minimum capacity 39.563Ah is the 107% of rated capacity 37Ah, and maximum capacity 39.905Ah is rated capacity 37Ah
108%, it is satisfied by requirement of the monomer capacity between 105%~110%.
(3) in Pack1 96 monomers tolerance=39996mAh-39753mAh=243mAh, less than rated capacity
0.675% i.e. 250mAh, meets the requirements；Tolerance=39905mAh-39563mAh=342mAh of 96 monomers in Pack2, greatly
In 0.675% i.e. 2500mAh of rated capacity, it is unsatisfactory for requiring.
(4) in Pack1 96 monomers difference in open circuit voltage=3618.0mV-3615.1mV=2.9mV, less than 5mV, meet
It is required that；Difference in open circuit voltage=3619.2mV-3610.8mV=8.4mV of 96 monomers in Pack2, more than 5mV, being unsatisfactory for will
Ask.
(5) in Pack1 96 monomers AC internal Resistance difference=0.672m Ω -0.608m Ω=0.064m Ω, 96 monomers
The average value of AC internal Resistance is 0.63m Ω, and it is 0.0945m Ω that internal resistance difference, which is less than average value 15%, is met the requirements；96 in Pack2
The AC internal Resistance difference of a monomer=0.697m Ω -0.597m Ω=0.1m Ω, the average value of 96 monomer AC internal Resistances is 0.64m
Ω, it is 0.096m Ω that internal resistance difference, which is more than average value 15%, is unsatisfactory for requiring.
In summary analysis is calculated, it is known that Pack1 ranges of capacity, tolerance, pressure difference, internal resistance difference are satisfied by requiring, and Pack2 is only
Range of capacity is met the requirements, it is clear that the static conformance of Pack1 is better than the static conformance of Pack2.
Secondly, the specific steps of Conformance Assessment analyze the dynamic of this two bags battery to battery system according to the invention afterwards in groups
State uniformity, it may include following steps：
1) by battery system Pack1 and Pack2 with blanking voltage as defined in 1C constant-current charges to battery enterprise, constant-voltage charge
To current reduction to 0.05C；
2) 30min is stood；
3) by battery system Pack1 and Pack2 with blanking voltage as defined in 37A constant-current discharges to battery enterprise；
4) calculate 1C electric discharge when 100%SOC~20%SOC and 20%SOC~0%SOC sections battery system in all lists
Bulk voltage standard deviation and very poor.
It is poor that voltage standard is calculated first, can be according to formulaBeing calculated, wherein S represents that voltage standard is poor,
UiRepresent the voltage of each battery cell,Represent the average voltage of all battery cells, n represents battery cell number.According to upper
The voltage standard for stating the battery cell that calculation formula can obtain Pack1 and Pack2 is poor.As shown in figure 4,96 monomers exist in Pack1
The voltage standard difference scope in 100%SOC~20%SOC sections meets unanimously less than 5mV between 2.93mV~4.61mV
Ask；20%SOC~0%SOC sections voltage standard difference scope between 3.11mV~57.64mV, meet less than 100mV
Coherence request.Pack2 100%SOC~20%SOC sections voltage standard difference scope between 7.39mV~16.86mV,
It is unsatisfactory for the consistent requirement less than 5mV；20%SOC~0%SOC sections voltage standard difference scope for 10.04mV~
Between 64.07mV, meet the coherence request less than 100mV.
Secondly it is very poor to calculate voltage, voltage is very poor for voltage max and the difference of voltage minimum.As shown in figure 5, Pack1
The very poor scope of voltage in 100%SOC~20%SOC sections meets one less than 30mV between 12.20mV~26.84mV
Cause to require；The very poor scope of voltage in 20%SOC~0%SOC sections meets to be less than between 14.64mV~222.04mV
The coherence request of 300mV.The very poor scope of voltages of the Pack2 in 100%SOC~20%SOC sections for 34mV~116mV it
Between, it is unsatisfactory for the consistent requirement less than 30mV；The very poor scope of voltage in 20%SOC~0%SOC sections is 56mV~551mV
Between, it is unsatisfactory for the coherence request less than 300mV.
In summary analysis is calculated, it is known that Pack1 is in 100%SOC~20%SOC and 20%SOC~0%SOC sections
Voltage standard difference and voltage is very poor is satisfied by dynamic conformance requirement, Pack2 is only in the voltage pole in 20%SOC~0%SOC sections
Difference meets dynamic conformance requirement.Obviously the dynamic conformance of Pack1 is also better than the dynamic conformance of Pack2.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of lithium-ion-power cell Conformance Assessment system
System, since the principle that the system solves the problems, such as is similar to foregoing lithium-ion-power cell method for evaluating consistency, this is
The implementation of system may refer to the implementation of preceding method, and overlaps will not be repeated.
As shown in fig. 6, a kind of lithium-ion-power cell Conformance Assessment system provided in this embodiment, including it is static consistent
Property Evaluation subsystem 1 and dynamic conformance Evaluation subsystem 2.
Wherein, it is consistent to include range of capacity Conformance Assessment module 101, tolerance for the static conformance Evaluation subsystem 1
Property evaluation module 102, pressure difference Conformance Assessment module 103 and internal resistance difference Conformance Assessment module 104.The range of capacity is consistent
Property evaluation module 101 be used for the capacity of all battery cells based on acquisition, determine the ranges of capacity of all battery cells, and will
Obtained range of capacity judges whether the battery system meets range of capacity compared with the rated capacity of battery system
Coherence request；The tolerance Conformance Assessment module 102 is used for the capacity of all battery cells based on acquisition, determines all
The minimum capacity of battery cell and the maximum capacity, and all batteries are obtained based on identified minimum capacity and maximum capacity
The tolerance of monomer, and by resulting tolerance compared with the rated capacity of battery system, whether judge the battery system
Meet tolerance coherence request；The pressure difference Conformance Assessment module 103 is used for 50% of all battery cells based on acquisition
SOC open-circuit voltages, determine the difference in open circuit voltage of all battery cells, and by identified difference in open circuit voltage and preset pressure threshold value
It is compared, judges whether the battery system meets pressure difference coherence request；The internal resistance difference Conformance Assessment module 104 is used
In the AC resistance of all battery cells based on acquisition, the AC internal Resistance difference and AC internal Resistance of all battery cells are determined
Average value, and identified AC internal Resistance is poor compared with the average value of the AC internal Resistance, judge the battery system
Whether internal resistance difference coherence request is met.In the present embodiment, the capacity of all battery cells, 50%SOC open-circuit voltages, in exchange
Resistance provides enterprise by battery system and provides.
The dynamic conformance Evaluation subsystem 2 includes voltage standard difference Conformance Assessment module 201 and voltage very poor one
Cause property evaluation module 202, wherein, 100%SOC when the voltage standard difference Conformance Assessment module 201 is used to calculate 1C electric discharges
The voltage standard voltage that is poor, and will being calculated of all monomers in~20%SOC and 20%SOC~0%SOC sections battery system
Standard deviation respectively with the preset standard in 100%SOC~20%SOC sections difference and the preset standard in 20%SOC~0%SOC sections
Difference is compared, and judges whether the battery system meets voltage standard difference coherence request；The very poor uniformity of voltage is commented
Own when valency module 202 is used to calculate 1C electric discharges in 100%SOC~20%SOC and 20%SOC~0%SOC sections battery system
The voltage of monomer is very poor, and by the voltage pole difference calculated not with the default very poor of 100%SOC~20%SOC sections and
20%SOC~0%SOC sections it is default it is very poor be compared, judge whether the battery system meets the very poor uniformity of voltage
It is required that.Before voltage standard difference Conformance Assessment module 201 judges whether to meet voltage standard difference coherence request and voltage
, can be first by the battery system 1C before very poor Conformance Assessment module 202 judges whether to meet the very poor coherence request of voltage
For constant-current charge to defined blanking voltage, constant-voltage charge to current reduction is and quiet by the battery system after constant-current charge to 0.05C
Put preset time, and the battery system 1C constant-current discharges after preset time will be stood to defined blanking voltage.
Further, the range of capacity Conformance Assessment module 101 is specifically used for：By obtained range of capacity and electricity
The rated capacity of cell system is compared, if the range of capacity is located within the scope of the preset ratio of the rated capacity,
Then determine that the battery system meets range of capacity coherence request.Wherein, the preset ratio scope is 105%~110%.
Further, the tolerance Conformance Assessment module 102 is specifically used for：By obtained tolerance and battery system
Rated capacity is compared, if the tolerance is not more than the preset ratio of the rated capacity, it is determined that the battery system is expired
Sufficient tolerance coherence request.Wherein, the preset ratio is 0.675%.
Further, the pressure difference Conformance Assessment module 103 is specifically used for：By identified difference in open circuit voltage with presetting
Threshold pressure differential is compared, if it is determined that difference in open circuit voltage be less than the preset pressure threshold value, it is determined that the battery system is expired
Sufficient pressure difference coherence request.Wherein, the preset pressure threshold value is 5mV.
Further, the internal resistance difference Conformance Assessment module 104 is specifically used for：By identified AC internal Resistance difference and institute
The average value for stating AC internal Resistance is compared, if AC internal Resistance difference is default no more than the average value of the AC internal Resistance
Ratio, it is determined that the battery system meets internal resistance difference coherence request.Wherein, the preset ratio of the average value of the AC internal Resistance
For 15%.
Further, the voltage standard difference Conformance Assessment module 201 is specifically used for：The voltage standard calculated is poor
Carried out respectively with the preset standard difference in 100%SOC~20%SOC sections and the preset standard difference in 20%SOC~0%SOC sections
Compare, if the voltage standard difference calculated is respectively smaller than the preset standard difference and 20%SOC in 100%SOC~20%SOC sections
The preset standard in~0%SOC sections is poor, it is determined that the battery system meets voltage standard difference coherence request.Wherein, it is described
100%SOC~20%SOC sections preset standard difference and 20%SOC~0%SOC sections preset standard difference be respectively 5mV and
100mV
Further, the very poor Conformance Assessment module 202 of the voltage is specifically used for：The voltage pole difference calculated is other
With 100%SOC~20%SOC sections it is default very poor and 20%SOC~0%SOC sections it is default it is very poor compared with, if
The voltage pole difference calculated is respectively smaller than default very poor and 20%SOC~0%SOC sections in 100%SOC~20%SOC sections
It is default very poor, it is determined that the battery system meets the very poor coherence request of voltage.Wherein, 100%SOC~20%
Default very poor and 20%SOC~0%SOC sections the default very poor respectively 30mV and 300mV in SOC sections.
The function of above-mentioned each module may correspond to the respective handling step in flow shown in Fig. 1 to 3, and details are not described herein.
Embodiment described above, is only the embodiment of the present invention, to illustrate technical scheme, rather than
It is limited, protection scope of the present invention is not limited thereto, although having been carried out in detail to the present invention with reference to the foregoing embodiments
Illustrate, it will be understood by those of ordinary skill in the art that：Any one skilled in the art the invention discloses
In technical scope, it can still modify the technical solution described in previous embodiment or can readily occur in change, or
Person carries out equivalent substitution to which part technical characteristic；And these modifications, change or replacement, do not make appropriate technical solution
Essence departs from the spirit and scope of technical solution of the embodiment of the present invention, should be covered by the protection scope of the present invention.Therefore,
Protection scope of the present invention answers the scope of the claims of being subject to.
Claims (10)
1. a kind of lithium-ion-power cell method for evaluating consistency, it is characterised in that be assembled into battery system including battery cell
Preceding static conformance evaluation and battery cell are assembled into the dynamic conformance evaluation after battery system；
The static conformance evaluation includes range of capacity, tolerance, pressure difference and internal resistance difference Conformance Assessment, specifically includes following step
Suddenly：
Obtain capacity, 50%SOC open-circuit voltages, the AC internal Resistance of all battery cells before battery system assembles；
Based on the capacity of acquired all battery cells, range of capacity, minimum capacity and the maximum of all battery cells are determined
Capacity, and the tolerance of all battery cells is obtained based on the minimum capacity and the maximum capacity；
Obtained range of capacity and tolerance are judged into the battery system compared with the rated capacity of battery system respectively
Whether range of capacity coherence request and tolerance coherence request are met；
Based on the open-circuit voltage of acquired all battery cells, the difference in open circuit voltage of all battery cells is determined；
By identified difference in open circuit voltage compared with preset pressure threshold value, judge whether the battery system meets pressure difference one
Cause property requires；
Based on the AC resistance of acquired all battery cells, determine in the AC internal Resistance difference and exchange of all battery cells
The average value of resistance；
Identified AC internal Resistance is poor compared with the average value of the AC internal Resistance, judge whether the battery system is full
Sufficient internal resistance difference coherence request；
Dynamic conformance evaluation includes voltage standard difference Conformance Assessment and the very poor Conformance Assessment of voltage, specifically include with
Lower step：
By the battery system 1C constant-current charges to defined blanking voltage, constant-voltage charge to current reduction to 0.05C；
Battery system after constant-current charge is stood into preset time；
By the battery system 1C constant-current discharges after standing preset time to defined blanking voltage；
Calculate 1C electric discharge when 100%SOC~20%SOC and 20%SOC~0%SOC sections battery system in all monomers electricity
Press standard deviation and voltage very poor；
By preset standard difference and 20%SOC~0% of the voltage standard difference calculated not with 100%SOC~20%SOC sections
The preset standard difference in SOC sections is compared, and judges whether the battery system meets voltage standard difference coherence request；
By default very poor and 20%SOC~0%SOC of the voltage pole difference calculated not with 100%SOC~20%SOC sections
Section it is default it is very poor be compared, judge whether the battery system meets the very poor coherence request of voltage.
2. evaluation method according to claim 1, it is characterised in that by obtained range of capacity and tolerance respectively with electricity
The rated capacity of cell system is compared, and judges whether the battery system meets that range of capacity coherence request is consistent with tolerance
Property require specifically include：
By obtained range of capacity compared with the rated capacity of battery system, if the range of capacity is located at the volume
Between the preset ratio scope of constant volume, it is determined that the battery system meets range of capacity coherence request；
By obtained tolerance compared with the rated capacity of battery system, if the tolerance is not more than the rated capacity
Preset ratio, it is determined that the battery system meets tolerance coherence request.
3. evaluation method according to claim 2, it is characterised in that the preset ratio scope is 105%~110%；
The preset ratio is 0.675%.
4. evaluation method according to claim 1, it is characterised in that by identified difference in open circuit voltage and preset pressure threshold
Value is compared, and judges whether the battery system meets that pressure difference coherence request includes：By identified difference in open circuit voltage with
Preset pressure threshold value is compared, if the difference in open circuit voltage is less than the preset pressure threshold value, it is determined that the battery system
Meet pressure difference coherence request.
5. evaluation method according to claim 4, it is characterised in that the preset pressure threshold value is 5mV.
6. evaluation method according to claim 1, it is characterised in that by identified AC internal Resistance it is poor with described exchange
The average value of resistance is compared, and judges whether the battery system meets that internal resistance difference coherence request includes：By identified friendship
Stream internal resistance is poor compared with the average value of the AC internal Resistance, if AC internal Resistance difference is no more than the AC internal Resistance
The preset ratio of average value, it is determined that the battery system meets internal resistance difference coherence request.
7. evaluation method according to claim 6, it is characterised in that the preset ratio of the average value of the AC internal Resistance is
15%.
8. evaluation method according to claim 1, it is characterised in that by the voltage standard difference calculated not with 100%
The preset standard difference in SOC~20%SOC sections and the preset standard difference in 20%SOC~0%SOC sections are compared, and judge institute
State whether battery system meets that voltage standard difference coherence request includes：
By preset standard difference and 20%SOC~0% of the voltage standard difference calculated not with 100%SOC~20%SOC sections
The preset standard difference in SOC sections is compared, if the voltage standard difference calculated is respectively smaller than 100%SOC~20%SOC areas
Between preset standard difference and 20%SOC~0%SOC sections preset standard it is poor, it is determined that the battery system meets voltage mark
Quasi- difference coherence request；
By default very poor and 20%SOC~0%SOC of the voltage pole difference calculated not with 100%SOC~20%SOC sections
Section it is default it is very poor be compared, judge whether the battery system meets that the very poor coherence request of voltage includes：
By default very poor and 20%SOC~0%SOC of the voltage pole difference calculated not with 100%SOC~20%SOC sections
Section it is default it is very poor be compared, if the voltage pole difference calculated is respectively smaller than the pre- of 100%SOC~20%SOC sections
It is if very poor and 20%SOC~0%SOC sections default very poor, it is determined that the battery system meets that the very poor uniformity of voltage will
Ask.
9. evaluation method according to claim 8, it is characterised in that preset in 100%SOC~20%SOC sections
Standard deviation and the preset standard in 20%SOC~0%SOC sections difference are respectively 5mV and 100mV, the 100%SOC~20%SOC
Default very poor and 20%SOC~0%SOC sections the default very poor respectively 30mV and 300mV in section.
A kind of 10. lithium-ion-power cell Conformance Assessment system, it is characterised in that including static conformance Evaluation subsystem and
Dynamic conformance Evaluation subsystem；
The static conformance Evaluation subsystem includes range of capacity Conformance Assessment module, tolerance Conformance Assessment module, pressure
Poor Conformance Assessment module and internal resistance difference Conformance Assessment module；
Wherein, the range of capacity Conformance Assessment module is used for the capacity of all battery cells based on acquisition, determines all
The range of capacity of battery cell, and by obtained range of capacity compared with the rated capacity of battery system, described in judgement
Whether battery system meets range of capacity coherence request；
The tolerance Conformance Assessment module is used for the capacity of all battery cells based on acquisition, determines all battery cells
Minimum capacity and the maximum capacity, and the appearance of all battery cells is obtained based on identified minimum capacity and maximum capacity
Difference, and by resulting tolerance compared with the rated capacity of battery system, judge whether the battery system meets tolerance
Coherence request；
The pressure difference Conformance Assessment module is used for the 50%SOC open-circuit voltages of all battery cells based on acquisition, determines institute
There is the difference in open circuit voltage of battery cell, and by identified difference in open circuit voltage compared with preset pressure threshold value, described in judgement
Whether battery system meets pressure difference coherence request；
The internal resistance difference Conformance Assessment module is used for the AC resistance of all battery cells based on acquisition, determines all batteries
The AC internal Resistance difference of monomer and the average value of AC internal Resistance, and identified AC internal Resistance is poor flat with the AC internal Resistance
Average is compared, and judges whether the battery system meets internal resistance difference coherence request；
The dynamic conformance Evaluation subsystem bag voltage standard difference Conformance Assessment module and the very poor Conformance Assessment mould of voltage
Block, wherein,
The voltage standard difference Conformance Assessment module be used for calculate 1C electric discharge when 100%SOC~20%SOC and 20%SOC~
The voltage standard of all monomers is poor in the battery system of 0%SOC sections, and by the voltage standard difference calculated not and 100%SOC
The preset standard difference in~20%SOC sections and the preset standard difference in 20%SOC~0%SOC sections are compared, and judge the electricity
Whether cell system meets voltage standard difference coherence request；
100%SOC~20%SOC and 20%SOC~0% when the very poor Conformance Assessment module of voltage is used to calculate 1C electric discharges
The voltage of all monomers is very poor in the battery system of SOC sections, and by the voltage pole difference calculated not with 100%SOC~20%
Default very poor and 20%SOC~0%SOC sections in SOC sections it is default it is very poor be compared, whether judge the battery system
Meet the very poor coherence request of voltage.
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