CN107634274B - A kind of battery pack method for group matching - Google Patents
A kind of battery pack method for group matching Download PDFInfo
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- CN107634274B CN107634274B CN201710752359.8A CN201710752359A CN107634274B CN 107634274 B CN107634274 B CN 107634274B CN 201710752359 A CN201710752359 A CN 201710752359A CN 107634274 B CN107634274 B CN 107634274B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of battery pack method for group matching, which is series-connected cell group, and method for group matching includes the following steps: S1, is mounted on battery core in detection partial volume equipment, records the capacity of each battery core；S2, according to charge-discharge magnification cycle charge-discharge required by purposes, record charging and discharging curve；S3, calculate each battery core discharge curve electricity with voltage change ratio dQ/dV curve, there are two peak values for dQ/dV curve, according to the corresponding voltage value of dQ/dV profile lookup peak value, the charge value of corresponding battery core is then found in discharge curve according to voltage value, the difference of two charge values is Dn；S4, the electricity that battery power is charged to 50%, calculate the self-discharge rate of each battery core；S5, Dn is subjected to stepping, is divided into multiple big groups；Each big group is divided into multiple middle groups further according to battery core capacity, and each middle group is divided into multiple groups according to self-discharge rate；When combo, combo is carried out with multiple battery cores in a small group.
Description
Technical field
The present invention relates to power battery pack, in particular to a kind of method for group matching of power battery pack.
Background technique
Since 2014, country promotes new-energy automobile and carries out financial subsidies, has greatly pushed lithium ion power electric
The progress of pond key technology, critical material and application product.The development of new-energy automobile be unable to do without the progress of chemical energy storage device,
And chemical energy storage battery of the lithium ion battery as mainstream, investment energetically has all been obtained in terms of research and development and industry.Electronic vapour
Vehicle is for power battery, it is of interest that safety, reliability and service life.Early period has compared the research of single power battery
Perfect, the service life theoretically meets the requirement of electric car, the not serious problem of safety, performance driving economy also gradually market
The degree that section receives.But the technology after using in groups on electric car, the progress of group technology will affect entire electronic
The progress of automobile industry.By prior art scenario, battery cell is had been carried out cycle life 3000 times, and can be by puncturing, squeezing
The various safety tests such as pressure, collision, crushing.And in groups after, only cycle life will decline 50% or more, if combo is not
When, can also be led to it is on fire explosion etc. safety accidents.
Ideal combo is that all measurable parameters are all consistent, however this method for group matching is actually inoperable.It is existing
Technology is all simplified combo requirement, and to meet on the whole, requirement, cost be lower, the more a height of principle of combo rate.It is most simple
Single combo is one-parameter combo, only considers rated capacity, as the combo of early stage is exactly, but one-parameter combo, 1500
The battery pack that the single power battery of secondary cycle life is made into, cycle life are less than the 1/10 of monomer.Dynamic combo considers mark
The coincidence degree of quasi- discharge curve, this mode otherwise combo rate is very low, otherwise be exactly to fail to grip with emphasis essence, be difficult after combo
More than the 1/3 of the monomer service life.And multi-parameter combo, while considering that the multiple parameters of battery carry out combo, whole group service life after combo
It is expected to reach single battery 1/2.If carrying out deep analysis to each combo parameter, the meaning of its essence, energy are found
More reasonably selection combo parameter.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of battery pack method for group matching, using less
Combo parameter guarantee combo effect, improve combo rate.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of battery pack method for group matching, the battery pack are
Series-connected cell group, method for group matching include the following steps:
S1, battery core is mounted in detection partial volume equipment, records the capacity of each battery core；
S2, according to charge-discharge magnification cycle charge-discharge required by purposes, record charging and discharging curve；
S3, calculate each battery core discharge curve electricity with voltage change ratio dQ/dV curve, there are two dQ/dV curves
Then peak value is found in discharge curve corresponding according to the corresponding voltage value of dQ/dV profile lookup peak value according to voltage value
The charge value of battery core, the difference of two charge values are Dn；
S4, the electricity that battery power is charged to 50%, calculate the self-discharge rate of each battery core；
S5, Dn is subjected to stepping, is divided into multiple big groups；Each big group is divided into multiple middle groups further according to battery core capacity, each
Middle group is divided into multiple groups according to self-discharge rate；When combo, combo is carried out with multiple battery cores in a small group.
It is grouped in each group according to battery core internal resistance, is grouped in a small group and in identical internal resistance when combo
Battery core carry out series connection combo.
In combo, the battery core series connection in same grouping is chosen, the battery capacity obtained after series connection is calculated and setting is held
Whether the difference of amount meets error threshold values, if it is not, replacing battery core in corresponding group until battery capacity, which meets, is less than mistake
Difference limen value.
According to the multiple cycle charge-discharge of charge-discharge magnification required by purposes, record obtains multiple charging and discharging curve, according to
Multiple charging and discharging curve obtains average charging and discharging curve to characterize the practical charging and discharging curve of battery core.
The capacity of battery core is the average value for repeatedly measuring obtained battery core cubic content measurement value.
The present invention has the advantages that in battery pack combo, it is contemplated that the corresponding charge value Dn of dQ/dV cutting edge of a knife or a sword spacing, the value
It is not only demonstrated by curve plateau capacity but also is also battery in the capacity of actual use, consider its consistency in combo, it can
To improve the performance of battery pack combo；And measurement charging and discharging curve be using be actually used in the discharge-rate of requirement into
Row measurement, charging and discharging curve is obtained more preferably and can reacted battery core state in actual use, ensure that the consistency of multiplying power is same
When guarantee self-discharge rate, capacity, the parameters such as resistance in combo, using four Dn, capacity, self-discharge rate, resistance parameters as dividing
Group standard, battery core carries out combo to guarantee that the consistency of battery core when battery combo is higher, after improving combo in the group after grouping
Series-connected cell group service life.And the combo under different radiating requirements can be effectively ensured in setting resistance in combo parameter.
Detailed description of the invention
Below to each width attached drawing of description of the invention expression content and figure in label be briefly described:
Fig. 1 is method for group matching flow chart of the present invention.
Specific embodiment
A specific embodiment of the invention is made further detailed below against attached drawing by the description to optimum embodiment
Thin explanation.
As shown, a kind of battery pack method for group matching, includes the following steps:
S1, battery core is mounted in detection partial volume equipment, records the capacity of each battery core；The capacity of single battery core is with multiple
The average value of the capacity of measurement is the capability value of battery core and is recorded.
S2, according to charge-discharge magnification cycle charge-discharge required by purposes, record charging and discharging curve；Here according to electric in groups
The difference in pond is used to also require the charge-discharge magnification of battery different, and charge-discharge magnification when with its work carries out cycle charge-discharge,
Detect its charging and discharging curve；According to the multiple cycle charge-discharge of charge-discharge magnification required by purposes, record obtains multiple charge and discharge
Curve obtains average charging and discharging curve according to multiple charging and discharging curve to characterize the practical charging and discharging curve of battery core, to reduce
The error of single measurement error bring charging and discharging curve；
S3, calculate each battery core discharge curve electricity with voltage change ratio dQ/dV curve, there are two dQ/dV curves
Then peak value is found in discharge curve corresponding according to the corresponding voltage value of dQ/dV profile lookup peak value according to voltage value
The charge value of battery core, the difference of two charge values are Dn；The charging and discharging curve formed between the two voltages is charge and discharge platform
Curve, difference are charge and discharge platform electricity Dn；
S4, the electricity that battery power is charged to 50%, calculate the self-discharge rate of each battery core；
S5, Dn is carried out to stepping, different Dn values is divided into multiple big groups；Each big group is divided into multiple further according to battery core capacity
Middle group, each middle group is divided into multiple groups according to self-discharge rate；When combo, combo is carried out with multiple battery cores in a small group.
In view of the heat dissipation performance of battery pack, the battery core in each group is grouped according still further to battery core internal resistance, combo
When in a small group and battery core internal resistance same packets battery core carry out combo, further press internal resistance according to actual radiating requirements
Group is separated into battery core group by size, with the battery core combo in battery core group.
In combo, the battery core series connection in same grouping is chosen, the battery capacity obtained after series connection is calculated and setting is held
Whether the difference of amount meets error threshold values, if it is not, replacing battery core in corresponding group until battery capacity, which meets, is less than mistake
Difference limen value.
Battery pack connects to be formed with multiple battery cores, requires the matching degree of battery pack battery core high due to connecting, uses
Four parameters are matched, and the battery core series connection in same grouping can satisfy the battery core Performance Match after combo, to increase
The service life of battery core after adding matching.Parameter approximate consistency when therefore in order to guarantee grouping as far as possible matches needs
The battery core of group is tested as follows:
Firstly, the N number of battery core for needing partial volume is installed in detection partial volume equipment, followed by the charge-discharge magnification of purposes requirement
Ring is multiple, records each charging and discharging curve, and the average charging and discharging curve for acquiring battery core is the charging and discharging curve of battery core, thus
Reduce error；A kind of embodiment of charge and discharge cycles number is 3 times, and it is bent to acquire average charge and discharge for the charging and discharging curve that record is 3 times
Line.
Multiple charging capacity, discharge capacity are recorded by partial volume equipment, by taking 3 charge and discharge in embodiment as an example, is then corresponded to
Battery core by 3 charging capacitys, 3 discharge capacities, the sum of three charging capacitys and 3 discharge capacities are charge and discharge divided by 6
The mean value of capacity, using the average value as the capability value of battery core；
Self-discharge rate, by battery core 15-45 DEG C at a temperature of, place 7-45 days, measure the self-discharge rate Sn of each battery core,
And it records.At a temperature of can choose 25 DEG C, 30 days are placed to obtain self-discharge rate.
The internal resistance value of each battery core is measured, and is recorded.
The discharge curve of each battery core is calculated with the change rate dQ/dV of voltage, obtains dQ/dV/ curve, dQ/dV curve has
Then two peak values are found in discharge curve pair according to the corresponding voltage value of dQ/dV profile lookup peak value according to voltage value
The charge value for the battery core answered, the difference of two charge values are Dn；The charging and discharging curve formed between the two voltages is charge and discharge
Platform curve, difference are charge and discharge platform electricity Dn；
According to the condition of summation combo, first battery core is grouped, stepping is carried out with the 1% of Dn value electricity section, such as
Dn value is 70mAh, is grouping with 1%, then can be divided into 63 < Dn≤70,56 < Dn≤63, and so on be grouped, as
Big group；It is grouped again with the 1% of battery capacity in big group, is divided into group in several, as single battery normal capacity is
100mAh, capacity are grouped then as 100 < Cn≤101,99 < Cn≤100, and so on classify, by battery core according to capacity
Value is assigned in different electricity groups；Then it is divided into several groups for middle group according to the 10% of self-discharge rate difference, chooses mark
Quasi- self-discharge rate, 20%-30%/moon is to put certainly with difference here on the basis of 20% to discharge rate Sn again as lead storage battery
The 10% of electric rate is that grouping difference is grouped, and every group of self-discharge rate difference is 2%, then grouping can for 20% < Sn≤
22%, 22% < Sn≤24%..., and so on obtain in again in group by small component with different battery cores；It is each identical small in this way
Battery core in group can meet combo and require, here can be in order to advanced optimize the heat dissipation performance of the battery after combo
Consider battery core internal resistance influence, internal resistance is small, generate heat it is small, for requiring the battery use condition of heat dissipation performance, can further by
Group is subdivided into multiple resistance groups, and resistance is divided into several shelves according to different requirements, then required internal resistance group is chosen when combo
Interior battery core combo can not consider resistance group, directly if battery pack has heat management system without the concern for heat dissipation at this time
Battery core in group chooses combo.The grouping of the internal resistance of cell is similar to above, using the 10% of standard internal resistance value as point
Other difference, standard internal resistance value are factory-designed specified internal resistance when battery core produces.
It to verify whether its capacity meets error requirement after the battery core combo of selection, in combo, choose in same grouping
Battery core series connection, whether the difference of obtained battery capacity and setting capacity meets error threshold values after calculating series connection, if it is not, from
Replacement battery core is until meeting error and being less than setting threshold values in corresponding grouping.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using method concept and skill of the invention
The improvement for the various unsubstantialities that art scheme carries out, it is within the scope of the present invention.
Claims (5)
1. a kind of battery pack method for group matching, it is characterised in that: the battery pack is series-connected cell group, and method for group matching includes following step
It is rapid:
S1, battery core is mounted in detection partial volume equipment, records the capacity of each battery core；
S2, according to charge-discharge magnification cycle charge-discharge required by purposes, record charging and discharging curve；
S3, calculate each battery core discharge curve electricity with voltage change ratio dQ/dV curve, dQ/dV curve there are two peak value,
According to the corresponding voltage value of dQ/dV profile lookup peak value, corresponding battery core is then found in discharge curve according to voltage value
Charge value, the differences of two charge values is Dn；
S4, the electricity that battery power is charged to 50%, calculate the self-discharge rate of each battery core；
S5, Dn is subjected to stepping, is divided into multiple big groups；Each big group is divided into multiple middle groups further according to battery core capacity, each middle group
It is divided into multiple groups according to self-discharge rate；When combo, combo is carried out with multiple battery cores in a small group.
2. a kind of battery pack method for group matching as described in claim 1, it is characterised in that: according to battery core internal resistance in each group
It is grouped, in a small group and the battery core in identical internal resistance grouping carries out series connection combo when combo.
3. a kind of battery pack method for group matching as claimed in claim 1 or 2, it is characterised in that: in combo, choose same a small group
Or with a small group and in the battery core series connection of identical internal resistance grouping, calculate the battery capacity obtained after series connection and setting capacity
Difference whether meet error threshold, if it is not, replacing battery core in corresponding group until battery capacity and setting capacity
Difference is less than error threshold.
4. a kind of battery pack method for group matching as claimed in claim 1 or 2, it is characterised in that: according to charge and discharge required by purposes
The electric multiple cycle charge-discharge of multiplying power, record obtain multiple charging and discharging curve, obtain average charge and discharge according to multiple charging and discharging curve
Electric curve characterizes the practical charging and discharging curve of battery core.
5. a kind of battery pack method for group matching as described in claim 1, it is characterised in that: the capacity of battery core is that repeatedly measurement obtains
Battery core cubic content measurement value average value.
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| CN108777329B (en) * | 2018-06-05 | 2019-06-28 | 湖北锂诺新能源科技有限公司 | Lithium battery method for group matching |
| CN110031771A (en) * | 2019-04-29 | 2019-07-19 | 上海玫克生储能科技有限公司 | A method of description battery consistency |
| CN111090053B (en) * | 2019-11-29 | 2022-04-22 | 力神（青岛）新能源有限公司 | Method for grading power batteries |
| CN216872055U (en) * | 2021-08-30 | 2022-07-01 | 陕西奥林波斯电力能源有限责任公司 | High-capacity lithium ion battery and simple battery cell |
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| US7646171B2 (en) * | 2004-01-06 | 2010-01-12 | Sion Power Corporation | Methods of charging lithium sulfur cells |
| CN102903977B (en) * | 2012-09-29 | 2014-09-24 | 江苏恒迅中锂新能源科技有限公司 | Method for assembling lithium battery |
| JP6038275B2 (en) * | 2013-02-22 | 2016-12-07 | 株式会社日立製作所 | Secondary battery deterioration diagnosis method and apparatus using the same |
| KR20150057819A (en) * | 2013-11-20 | 2015-05-28 | 삼성에스디아이 주식회사 | Rechargeable battery |
| CN106824831A (en) * | 2016-12-19 | 2017-06-13 | 金同林 | A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity |
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