CN108306065A - Lithium ion battery grouping method and lithium ion battery combo system - Google Patents
Lithium ion battery grouping method and lithium ion battery combo system Download PDFInfo
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- CN108306065A CN108306065A CN201810097014.8A CN201810097014A CN108306065A CN 108306065 A CN108306065 A CN 108306065A CN 201810097014 A CN201810097014 A CN 201810097014A CN 108306065 A CN108306065 A CN 108306065A
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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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- 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
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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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Abstract
The present invention provides a kind of lithium ion battery grouping method and lithium ion battery combo systems, are related to the technical field of lithium battery production technology.Lithium ion battery grouping method includes battery coding, the test of battery first time partial volume, second of partial volume of battery, battery first time room temperature, second of room temperature test of battery, internal resistance of cell test, battery stepping combo step.It solves by the way of one-parameter combo method according to single, error is big, the essential distinction between battery cannot be showed by the way of multi-parameter combo method, is harmonious poor, in such a way that two kinds of multiple parameters combo, charging and discharging curve combo method method for group matching are used in combination the technical issues of operating process complexity, low production efficiency.The lithium ion battery grouping method of the present invention, the battery consistency of combo is more preferable, and charge-discharge performance improves, and this scheme does not need re-test other parameters, and when combo is not influenced by state-of-charge, can under the state-of-charge of arbitrary low dynamics battery pack combo.
Description
Technical field
The present invention relates to lithium battery production technical fields, more particularly, to a kind of lithium ion battery grouping method and lithium ion
Battery combo system.
Background technology
Electric vehicle has higher requirement, single battery need to be after combining accordingly the power and energy of power source
Larger power and energy could be provided, theoretically require the parameters such as internal resistance, the capacity of these batteries consistent as possible, so as to
Keep the power that battery releases maximum.And due to the shadow by factors such as working condition, manufacturing environment, material property, production equipments
It rings, the multiple single batteries being actually combined, there is some difference for meeting in terms of performance parameter, such as：Monomer rated capacity,
Monomer open-circuit voltage, monomer charging voltage platform, monomer discharge voltage plateau, monomer internal resistance, monomer electrochemical properties etc., this
A little difference will gradually increase during its recycling, will eventually lead to the failure of battery pack.Therefore, to battery
Before being assembled, it is necessary to go out consistent battery cell by group gas-mixing screening and carry out combo, assembling, could make battery
The overall performance of group reaches the requirement used.
Currently, when being screened to battery cell, it is mainly special using one-parameter combo method, multi-parameter combo method, charge and discharge
Linearity curve combo method, by one or both of performances such as measurement capacity, pressure drop and the internal resistance of battery come combo battery.
It is incomplete in terms of consideration since screening is according to single, it is difficult in practice extensively by the way of one-parameter combo method
Using application condition is big；By the way of multi-parameter combo method, the characteristic item extracted increases than one-parameter combo method, matches
Group advantage is it is obvious that still, cannot be by the essential area between battery because not accounting for the variation of battery parameter during the work time
It does not show, it is harmonious poor；It is used in combination using two kinds of multiple parameters combo, charging and discharging curve combo method method for group matching, though
It can also so reflect the dynamic characteristic of battery, still, the operating process of the method is more complicated, is not suitable for actual production,
Low production efficiency.
Therefore, this patent is on the basis of existing battery grouping method, it is proposed that a kind of charged shape of low dynamics battery pack
Power lithium-ion battery method for group matching under state.
Invention content
The purpose of the present invention is to provide lithium ion battery grouping methods, existing in the prior art to alleviate, and use
The mode of one-parameter combo method, cannot be by the essential area between battery by the way of multi-parameter combo method according to single, error is big
It does not show, harmonious poor, the side being used in combination using multiple parameters combo, charging and discharging curve combo two kinds of method for group matching of method
The technical issues of formula operating process complexity, low production efficiency.
A kind of lithium ion battery grouping method provided by the invention, includes the following steps：
S100, battery first time partial volume
Battery to be detected is placed in secondary cell performance detection cabinet, on a preset condition based, tests the direct current of battery
Discharge capacity C1 carries out first time partial volume according to valid data to battery, and valid data include the direct-current discharge capacity C 1 of battery,
Valid data carry out discharge examination with operating current；
S200, the test of battery first time room temperature
Battery after partial volume is put into progress room temperature aging in aging cabinet, the process of room temperature aging is in 10-30 DEG C of temperature
Lower retention time Δ T1 tests the open-circuit voltage OCV1 and AC internal Resistance R1 of battery；
Second S300, battery of room temperature test
After battery first time room temperature is completed, battery is put into progress room temperature aging, room temperature aging in aging cabinet again
Process be retention time Δ T2 at a temperature of 10-30 DEG C, test the open-circuit voltage OCV2 and AC internal Resistance R2 of battery,
The self-discharge rate K for calculating battery, according to following formula：
K=(OCV1-OCV2)/Δ T2,
Battery is subjected to stepping by self-discharge rate K values, sorts out the undesirable battery of K values, internal resistance value；
Satisfactory battery is subjected to stepping by K values, open-circuit voltage；
S400, internal resistance of cell test
Battery is put into the DC charging that voltage internal resistance detection cabinet carries out 3 times of capacity, DC charging process retention time Δ
The numberical range of T3 obtains DC charging current I1 values between -20 seconds 5 seconds, calculates voltage change slope, as DC charging
Internal resistance R3 values, according to following formula：
R3=(3*I1)/OCV2,
Battery is put into the direct-current discharge that voltage internal resistance detection cabinet carries out 3 times of capacity, direct-current discharge process retention time Δ
The numberical range of T4 obtains direct-current discharge electric current I2 values between -20 seconds 5 seconds, calculates voltage change slope, as direct-current discharge
Internal resistance R4 values, according to following formula：
R4=(3*I2)/OCV2,
By data above, polarization resistance R5 is calculated, according to following formula：
R5=DC internal resistances value-internal resistance value,
According to the numerical value of polarization resistance R5, the undesirable batteries of polarization resistance R5 are sorted out；
S500, battery stepping combo
According to the above-mentioned capability value measured, the number of self-discharge rate value, internal resistance value, polarization resistance value, open-circuit voltage values
Stepping combo is carried out according to battery.
Further, further include following steps before the step S100：
S000, battery coding
The coding information on battery is scanned and recorded using encoding device, and the detection data of battery and coding information are stored in
Database in computer, the computer include data processing module, the data processing module complete data calculating and
Analysis is realized and automates selected combo.
Further, further include following steps after the step S100：
Second S101, battery of partial volume
Battery after first time partial volume is placed again into secondary cell performance detection cabinet, on a preset condition based, tests battery
Direct-current discharge capacity C 2, according to valid data to battery carry out second of partial volume, valid data include the direct-current discharge of battery
Capacity C 2,
It is subject to the direct-current discharge capacity C 2 measured for the second time, and with reference to the direct-current discharge capacity C 1 measured for the first time, point
Sort out the battery of capacity exception；
After the step S101, battery is put into equalizing voltage in balanced cabinet so that the voltage difference between battery is in 1mV
Within.
Further, in the step S100, the preset condition is charging voltage, and the value of the charging voltage
Range is between 3.0V-3.65V.
Further, in the step S200, the time range of Δ T1 is between 12h-24h.
Further, after the step S200, the battery after first time room temperature is tested, which is put into balanced cabinet, to carry out
Equalizing voltage.
Further, in the step S300,
The time range of Δ T2 is between 48h-120h.
Further, in the step S300,
Sorting the standard of undesirable battery is：The standard of internal resistance value is less than the battery of 0.2m Ω；
The standard of stepping is carried out to the battery after sorting is：Stepping, the value area of K values are carried out according to the interval of K values
Between between -0.1mV/h-0.15mV/h.
Further, in the step S500, when stepping combo, the battery of various class is carried out in parallel or series,
Form power battery pack.
The present invention also provides a kind of lithium ion battery combo systems, including code-spraying equipment, computer, secondary cell performance to examine
Survey cabinet, balanced cabinet, aging cabinet and voltage internal resistance detection cabinet；
The code-spraying equipment is used to prepare coding information to battery, and the computer is for storing coding information and testing number
According to, the secondary cell performance detection cabinet for being detected to the performance parameter of battery, the equilibrium cabinet be used for battery into
Row equalizing voltage, the aging cabinet are used to carry out burn-in test to battery, and AC internal Resistance is equipped in the voltage internal resistance detection cabinet
Detection device and DC internal resistance detection device；
The encoding device includes scanner and ink jet numbering machine, by the ink jet numbering machine in battery surface to battery identification information
It is encoded, encodes to obtain battery identification information with scanner scanning battery.
Lithium ion battery grouping method provided by the invention uses battery first time partial volume, battery first time room temperature successively
Test, second room temperature of battery test, internal resistance of cell test, battery stepping combo；The method is as a kind of multi-parameter
Combo method can test and calculate the parameters such as battery capacity, self-discharge rate, AC internal Resistance, polarization resistance, open-circuit voltage, wherein
Polarization resistance of the battery in charge and discharge process, can reflect the variation tendency of various parameters in cell operations, can incite somebody to action
Essential distinction between battery shows；Combo is carried out with such method, lithium ion battery eliminates each list to greatest extent
Difference between body battery optimizes the combination of battery.The lithium ion battery grouping method of the present invention, the battery consistency of combo
More preferably, charge-discharge performance improves, and this scheme does not need re-test other parameters, and when combo is not influenced by state-of-charge,
The state-of-charge combo for the power battery pack that in office can anticipate.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the flow chart of lithium ion battery grouping method provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of lithium ion battery combo system provided in an embodiment of the present invention.
Icon：.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that such as occur term "center", "upper", "lower", "left", "right",
"vertical", "horizontal", "inner", "outside" etc., indicated by orientation or positional relationship be orientation based on ... shown in the drawings or position
Relationship is merely for convenience of description of the present invention and simplification of the description, and not indicating or implying the indicated device or element must have
There is specific orientation, with specific azimuth configuration and operation, therefore is not considered as limiting the invention.In addition, as occurred
Term " first ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace such as occur
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned art with concrete condition
The concrete meaning of language in the present invention.
Fig. 1 is the flow chart of lithium ion battery grouping method provided in an embodiment of the present invention.
As shown in Figure 1, a kind of lithium ion battery grouping method provided by the invention, includes the following steps：
S000, battery coding
The coding information on battery is scanned and recorded using encoding device, and the detection data of battery and coding information are stored in
Database in computer, the computer include data processing module, the data processing module complete data calculating and
Analysis is realized and automates selected combo.
In the present embodiment, coding information is prepared on battery using encoding device, and coding information is stored in computer,
Scanner and ink jet numbering machine may be used in encoding device, by ink jet numbering machine by battery identification information spray printing on the surface of battery, then
It is scanned on battery with scanner and obtains coding information, before executing S100 steps, scanned using scanning device and record electricity
The detection data of battery and coding information are stored in database, data processing module are equipped in computer by the coding information on pond,
Data processing module completes the calculating and analysis of data, realizes and automates selected combo.
S100, battery first time partial volume
Battery to be detected is placed in secondary cell performance detection cabinet, on a preset condition based, tests the direct current of battery
Discharge capacity C1 carries out first time partial volume according to valid data to battery, and valid data include the direct-current discharge capacity C 1 of battery,
Valid data carry out discharge examination with operating current；
Further, in the step S100, the preset condition is charging voltage, and the value of the charging voltage
Range is between 3.0V-3.65V.
In the present embodiment, battery to be detected is placed in secondary cell performance detection cabinet, is 3.2V in charging voltage
Under conditions of, the direct-current discharge capacity C 1 of battery is tested, the data and required standard value of detection are compared, are sorted out
Reach the battery of standard value, the battery that removal capacity is abnormal or capacity is bigger, preliminary screening goes out the good battery of consistency.
After battery tentatively sorting, the battery that standard value is reached to sorting is shelved 10 minutes.
Further, further include following steps after the step S100：
Second S101, battery of partial volume
Battery after first time partial volume is placed again into secondary cell performance detection cabinet, on a preset condition based, tests battery
Direct-current discharge capacity C 2, according to valid data to battery carry out second of partial volume, valid data include the direct-current discharge of battery
Capacity C 2,
It is subject to the direct-current discharge capacity C 2 measured for the second time, and with reference to the direct-current discharge capacity C 1 measured for the first time, point
Sort out the battery of capacity exception；
In the present embodiment, the battery after shelving is placed again into secondary cell performance detection cabinet, is in charging voltage
Under conditions of 3.2V, the direct-current discharge capacity C 2 of battery is tested, the data and required standard value of detection are compared, point
The battery for reaching standard value is sorted out, the battery that removal capacity is abnormal or capacity is bigger filters out the good electricity of consistency again
Pond, meanwhile, the direct-current discharge capacity C 1 measured with reference to first avoids judging by accident, Database Systems according to the coding information of battery from
It is dynamic to select, improve efficiency.
After the step S101, battery is put into equalizing voltage in balanced cabinet so that the voltage difference between battery is in 1mV
Within.
Effect using balanced cabinet is can both to have made the differential pressure balancing between battery cell, is less than 1mV, and may be implemented
High-volume equalizing voltage, to improve operating efficiency.
After the secondary sorting of battery, the battery that standard value is reached to sorting is shelved 10 minutes.
S200, the test of battery first time room temperature
Battery after partial volume is put into progress room temperature aging in aging cabinet, the process of room temperature aging is in 10-30 DEG C of temperature
Lower retention time Δ T1 tests the open-circuit voltage OCV1 and AC internal Resistance R1 of battery；
Further, in the step S200, the time range of Δ T1 is between 12h-24h.
In the present embodiment, the battery after partial volume is put into aging cabinet, 25 DEG C of the temperature setting in aging cabinet, battery is kept
Time is 16h, tests the open-circuit voltage OCV1 and AC internal Resistance R1 of battery.
Further, after the step S200, the battery after first time room temperature is tested, which is put into balanced cabinet, to carry out
Equalizing voltage.
Second S300, battery of room temperature test
After battery first time room temperature is completed, battery is put into progress room temperature aging, room temperature aging in aging cabinet again
Process be retention time Δ T2 at a temperature of 10-30 DEG C, test the open-circuit voltage OCV2 and AC internal Resistance R2 of battery,
Further, in the step S300,
The time range of Δ T2 is between 48h-120h.
In the present embodiment, the battery after first time room temperature is tested is placed again into aging cabinet, and the temperature in aging cabinet is set
25 DEG C are set, the battery retention time is 72h, tests the open-circuit voltage OCV2 and AC internal Resistance R2 of battery.
The self-discharge rate K for calculating battery, according to following formula：
K=(OCV1-OCV2)/Δ T2,
Battery is subjected to stepping by self-discharge rate K values, sorts out the undesirable battery of K values, internal resistance value；
Further, in the step S300,
Sorting the standard of undesirable battery is：The standard of internal resistance value is less than the battery of 0.2m Ω；
Battery to not meeting standard value screens, and sorts out the standard compliant battery of internal resistance value.
Satisfactory battery is subjected to stepping by K values, open-circuit voltage；
The standard of stepping is carried out to the battery after sorting is：Stepping, the value area of K values are carried out according to the interval of K values
Between between -0.1mV/h-0.15mV/h.
By battery of the K values between -0.1mV/h-0.15mV/h, sort out.
S400, internal resistance of cell test
Battery is put into the DC charging that voltage internal resistance detection cabinet carries out 3 times of capacity, DC charging process retention time Δ
The numberical range of T3 obtains DC charging current I1 values between -20 seconds 5 seconds, calculates voltage change slope, as DC charging
Internal resistance R3 values, according to following formula：
R3=(3*I1)/OCV2,
Battery is put into the direct-current discharge that voltage internal resistance detection cabinet carries out 3 times of capacity, direct-current discharge process retention time Δ
The numberical range of T4 obtains direct-current discharge electric current I2 values between -20 seconds 5 seconds, calculates voltage change slope, as direct-current discharge
Internal resistance R4 values, according to following formula：
R4=(3*I2)/OCV2,
By data above, polarization resistance R5 is calculated, according to following formula：
R5=DC internal resistances value-internal resistance value,
According to the numerical value of polarization resistance R5, the undesirable batteries of polarization resistance R5 are sorted out；
In the present embodiment, it is according to the polarization resistance R5 method for carrying out stepping, first according to DC charging internal resistance detection value,
DC charging internal resistance value is calculated, further according to direct-current discharge internal resistance detection value, direct-current discharge internal resistance value at calculating is utilized respectively straight
Current charge internal resistance detection value-internal resistance value, direct-current discharge internal resistance detection value-internal resistance value are calculated, and obtain charging shape
The polarization resistance value under polarization resistance value and discharge condition under state, then sorts out the polarization resistance under DC charging state
The non-compliant battery of polarization resistance value under value, direct-current discharge state.
Using polarization resistance value as standard, battery is sorted, efficient, the battery pack balancing after combo of sorting
Property is good, and error is small.
S500, battery stepping combo
According to the above-mentioned capability value measured, the number of self-discharge rate value, internal resistance value, polarization resistance value, open-circuit voltage values
Stepping combo is carried out according to battery.
Further, in the step S500, when stepping combo, the battery of various class is carried out in parallel or series,
Form power battery pack.
Above-mentioned lithium ion battery can be digital battery combo, Notebook Battery combo, low-power battery combo, move greatly
Power battery combo.
In above-mentioned steps, DC internal resistance mensuration can be DCR methods, HPPC methods, MCCF methods, or be joined according to applying working condition
The equivalent test method of the three kinds of methods in face design before examination.
Internal resistance detection method is as follows in the present embodiment：
AC internal Resistance method：Using the sine-wave current (generally mA ranks) of 1KHz, to test caused pressure drop, in calculating
Resistance value.
DC internal resistance method：The electric current in work, pressure drop caused by just being tested after delay a period of time is directly used to calculate
Internal resistance value.
DCR methods：Using the electric current of different charging and discharging multiplying powers, continue 10S, recording voltage and electric current, forms one
Straight line, slope are internal resistance.
MCCF methods：Use the duration for the pulse charging and discharging currents of 5S, recording voltage drop calculates internal resistance.
HPPC methods：Using continuous charge and discharge electric pulse, pressure drop caused by testing is exemplified below there are two types of method：When electric discharge
Between 18 seconds, charge 2S；The charge and discharge time is 10S.
Lithium ion battery grouping method provided by the invention, by capacity check twice, twice in voltage drop detection and four kinds
Resistance detection can utmostly choose bad battery cell according to above-mentioned parameter, at the same using capacity, self-discharge rate, internal resistance and
The parameters such as polarization resistance carry out comprehensive combo, with high accuracy combo can go out to best suit the battery pack of actual condition.Pass through two
Secondary measurement capacity is subject to based on second of discharge capacity, with reference to first time discharge capacity, can prevent from judging by accident, with work
It is partial volume electric current to make electric current, utmostly detects actually active capacity；It is selected by low-voltage twice, when by two vice-minister
Between aging, in the way of direct-current discharge and DC charging, test obtains polarization resistance value, is divided according to polarization resistance value
It picks, can ensure battery performance reliability and stability after sorting；By using Database Systems, automation pairing, with composition
Power and combo are efficient, while saving manpower and materials；Using partial volume twice and aging, test poor contact is greatly reduced
The defect combo problem that causes capacity inaccurate.
Fig. 2 is the structure diagram of lithium ion battery combo system provided in an embodiment of the present invention.
The present invention also provides a kind of lithium ion battery combo systems, including code-spraying equipment, computer, secondary cell performance to examine
Survey cabinet, balanced cabinet, aging cabinet and voltage internal resistance detection cabinet；
The code-spraying equipment is used to prepare coding information to battery, and the computer is for storing coding information and testing number
According to, the secondary cell performance detection cabinet for being detected to the performance parameter of battery, the equilibrium cabinet be used for battery into
Row equalizing voltage, the aging cabinet are used to carry out burn-in test to battery, and AC internal Resistance is equipped in the voltage internal resistance detection cabinet
Detection device and DC internal resistance detection device；
The encoding device includes scanner and ink jet numbering machine, by the ink jet numbering machine in battery surface to battery identification information
It is encoded, encodes to obtain battery identification information with scanner scanning battery.
In the present embodiment, the sequence of flow when combo of battery is to be prepared on battery using coding scanning device first
Go out coding information, battery is then put into test direct-current discharge capacity in secondary cell performance detection cabinet, first is carried out to battery
Secondary partial volume, the battery after first time partial volume are put into equalizing voltage in balanced cabinet, it is balanced after battery be placed again into secondary cell
In energy detecting box, direct-current discharge capacity is tested again, second of partial volume is carried out to battery, the battery after second of partial volume is put into
Equalizing voltage in weighing apparatus cabinet；Battery after equilibrium, which is put into aging cabinet, carries out first time aging, tests open-circuit voltage and the friendship of battery
Flow internal resistance, the battery after first time aging is put into equalizing voltage in balanced cabinet, it is balanced after battery be placed again into aging cabinet into
The open-circuit voltage and AC internal Resistance of battery are tested in second of aging of row；Battery after second of aging is put into voltage internal resistance detection
DC charging test, direct-current discharge test are carried out in cabinet, calculate polarization resistance value.It is last according to the capability value measured, self discharge
Rate value, internal resistance value, polarization resistance value, the data of open-circuit voltage values pick out the good battery of consistency and carry out stepping combo two
Primary cell performance detection cabinet and voltage internal resistance detection cabinet are connect with computer, for storing and analyzing processing coding information and inspection
Measured data.That is the trend of battery is encoding device-secondary cell performance detection cabinet-equilibrium cabinet-secondary cell performance detection
Cabinet-equilibrium cabinet-aging cabinet-equilibrium cabinet-aging cabinet-equilibrium cabinet-voltage internal resistance detection cabinet-equilibrium cabinet-voltage internal resistance
Detecting box.
The lithium ion battery combo system that the present embodiment is provided passes through secondary cell performance detection cabinet, balanced cabinet, scanning
The combination of the equipment such as rifle, ink jet numbering machine, computer, voltage internal resistance detection cabinet and aging cabinet, it is at low cost, it is suitable for high request
Digital battery combo, Notebook Battery combo, medium and small power battery combo and big power battery combo.The battery pack balancing of combo
Property it is good, error is small, according to operating current detect capacity combo more meet actual condition.Pass through internal resistance value, DC internal resistance
Value, polarization resistance value combine combo, overcome the defect of the prior art, improve the consistency of the battery cell of battery pack.It adopts
With sorting, aging combo twice, combo validity height, hence it is evident that promote battery pack reliability, and automatic using Database Systems
Combo, high degree of automation, combo success rate and combo are efficient.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of lithium ion battery grouping method, which is characterized in that include the following steps：
S100, battery first time partial volume
Battery to be detected is placed in secondary cell performance detection cabinet, on a preset condition based, tests the direct-current discharge of battery
Capacity C 1 carries out first time partial volume according to valid data to battery, and valid data include the direct-current discharge capacity C 1 of battery, effectively
Data carry out discharge examination with operating current；
S200, the test of battery first time room temperature
Battery after partial volume is put into progress room temperature aging in aging cabinet, the process of room temperature aging is protected at a temperature of 10-30 DEG C
Time Δ T1 is held, the open-circuit voltage OCV1 and AC internal Resistance R1 of battery are tested；
Second S300, battery of room temperature test
After battery first time room temperature is completed, battery is put into progress room temperature aging, the mistake of room temperature aging in aging cabinet again
Journey is retention time Δ T2 at a temperature of 10-30 DEG C, tests the open-circuit voltage OCV2 and AC internal Resistance R2 of battery,
The self-discharge rate K for calculating battery, according to following formula：
K=(OCV1-OCV2)/Δ T2,
Battery is subjected to stepping by self-discharge rate K values, sorts out the undesirable battery of K values, internal resistance value；
Satisfactory battery is subjected to stepping by K values, open-circuit voltage；
S400, internal resistance of cell test
Battery is put into the DC charging that voltage internal resistance detection cabinet carries out 3 times of capacity, DC charging process retention time Δ T3's
Numberical range obtains DC charging current I1 values between -20 seconds 5 seconds, calculates voltage change slope, as DC charging internal resistance
R3 values, according to following formula：
R3=(3*I1)/OCV2,
Battery is put into the direct-current discharge that voltage internal resistance detection cabinet carries out 3 times of capacity, direct-current discharge process retention time Δ T4's
Numberical range obtains direct-current discharge electric current I2 values between -20 seconds 5 seconds, calculates voltage change slope, as direct-current discharge internal resistance
R4 values, according to following formula：
R4=(3*I2)/OCV2,
By data above, polarization resistance R5 is calculated, according to following formula：
R5=DC internal resistances value-internal resistance value,
According to the numerical value of polarization resistance R5, the undesirable batteries of polarization resistance R5 are sorted out；
S500, battery stepping combo
According to the above-mentioned capability value measured, self-discharge rate value, internal resistance value, polarization resistance value, the data pair of open-circuit voltage values
Battery carries out stepping combo.
2. lithium ion battery grouping method according to claim 1, which is characterized in that before the step S100, also
Include the following steps：
S000, battery coding
The coding information on battery is scanned and recorded using encoding device, and the detection data of battery and coding information deposit are calculated
Database in machine, the computer include data processing module, and the data processing module completes the calculating and analysis of data,
It realizes and automates selected combo.
3. lithium ion battery grouping method according to claim 1, which is characterized in that after the step S100, also
Include the following steps：
Second S101, battery of partial volume
Battery after first time partial volume is placed again into secondary cell performance detection cabinet, on a preset condition based, tests the straight of battery
Capacitance C2 is banished, second of partial volume is carried out to battery according to valid data, valid data include the direct-current discharge capacity of battery
C2,
It is subject to the direct-current discharge capacity C 2 measured for the second time, and with reference to the direct-current discharge capacity C 1 measured for the first time, sorts out
The battery of capacity exception；
After the step S101, battery is put into equalizing voltage in balanced cabinet so that voltage difference between battery 1mV with
It is interior.
4. lithium ion battery grouping method according to claim 1, which is characterized in that described in the step S100
Preset condition is charging voltage, and the value range of the charging voltage is between 3.0V-3.65V.
5. lithium ion battery grouping method according to claim 1, which is characterized in that in the step S200, Δ T1
Time range between 12h-24h.
6. lithium ion battery grouping method according to claim 1, which is characterized in that, will after the step S200
Battery after the test of first time room temperature, which is put into balanced cabinet, carries out equalizing voltage.
7. lithium ion battery grouping method according to claim 1, which is characterized in that in the step S300,
The time range of Δ T2 is between 48h-120h.
8. lithium ion battery grouping method according to claim 1, which is characterized in that in the step S300,
Sorting the standard of undesirable battery is：The standard of internal resistance value is less than the battery of 0.2m Ω；
The standard of stepping is carried out to the battery after sorting is：Carry out stepping according to the interval of K values, the intervals of K values-
Between 0.1mV/h-0.15mV/h.
9. lithium ion battery grouping method according to claim 1, which is characterized in that in the step S500, stepping
When combo, the battery of various class is carried out in parallel or series, to form power battery pack.
10. the lithium ion battery used in lithium ion battery grouping method described in a kind of any one of claim 1-9 is matched
Group system, which is characterized in that including code-spraying equipment, computer, secondary cell performance detection cabinet, balanced cabinet, aging cabinet and voltage
Internal resistance detection cabinet；
The code-spraying equipment is used to prepare coding information to battery, and the computer is used to store coding information and detection data,
For being detected to the performance parameter of battery, the equilibrium cabinet is used to carry out battery equal the secondary cell performance detection cabinet
Weigh voltage, and the aging cabinet is used to carry out burn-in test to battery, and being equipped with AC internal Resistance in the voltage internal resistance detection cabinet detects
Equipment and DC internal resistance detection device；
The encoding device includes scanner and ink jet numbering machine, is carried out to battery identification information in battery surface by the ink jet numbering machine
Coding encodes to obtain battery identification information with scanner scanning battery.
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