CN104992052B - A kind of power lithium-ion battery maximum charging current computational methods - Google Patents
A kind of power lithium-ion battery maximum charging current computational methods Download PDFInfo
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- CN104992052B CN104992052B CN201510333637.7A CN201510333637A CN104992052B CN 104992052 B CN104992052 B CN 104992052B CN 201510333637 A CN201510333637 A CN 201510333637A CN 104992052 B CN104992052 B CN 104992052B
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Abstract
The present invention provides a kind of power lithium-ion battery maximum charging current computational methods, belongs to technical field of lithium ion.Based on power lithium ion battery pole and temperature characteristic, establish lithium ion battery charging polarizing voltage and charging Temperature Rise Model, polarizing voltage and degree temperature ceiling system are set in charging process, it is proposed the lithium ion battery maximum charging current computational methods based on polarizing voltage limitation and warm ceiling, and rely on the maximum charging current curve of the Wen Sheng and polarizing voltage limitation of proposition, it is proposed a kind of charging current curve with SOC stepped changes, while ensureing to charge rapidity, the polarizing voltage and Wen Sheng of limitation charging process are in allowed limits, it ensure that charging capacity, charge efficiency and charging security and battery life.
Description
Technical field
The present invention relates to field of lithium ion battery, more particularly to a kind of power lithium-ion battery maximum charging current calculating side
Method.
Background technology
Currently, constant current constant voltage (CC-CV) charging method is widely used in lithium-ion-power cell.First, using constant electricity
Stream (CC) charges the battery, when cell voltage reaches charge cutoff voltage, using constant-voltage charge (CV), charging current by
Decrescence small, when battery charge is reduced to a certain value, charging terminates.This charging method is easy to control, in constant-voltage phase,
Polarizing voltage and ohmic voltage reduce, and battery can be fully charged, but long the time required to charging, and are influenced not on battery life
The problems such as specifying has become the technical bottleneck of limitation electric vehicle further genralrlization application.
Maas in 1972 proposes that condition charges three laws in order to control with lead-acid battery electrode gassing rate, i.e. Mas law,
Show that lead-acid accumulator by the way of positive negative pulse stuffing charging, can be such that the charge acceptance of battery greatly improves.Based on above-mentioned
Principle, researcher propose the pulse charge method of lead-acid battery.The principle of electrochemical reaction of lithium-ion-power cell and spy
Property it is different with lead-acid battery, therefore cannot directly Mas law mise-a-la-masse method it is stiff indiscriminately imitate be applied to lithium ion battery charging
In.But it can be with the Research Thinking of the maximum acceptable charging current of analogy lead-acid battery, in conjunction with lithium ion battery electrochemistry itself
Reaction mechanism and electrical characteristic find the maximum acceptable charging current of lithium ion battery.
In conjunction with the electrochemical reaction mechanism and its electrical characteristic inside dynamic lithium battery, optimizes battery charging strategy, be to work as
The developments of preceding battery charging strategy research.Polarizing voltage is that contact inside battery electrochemical reaction and outside batteries are electrically special
The bridge of property.Polarizing voltage, which crosses senior general, to be made battery be not fully filled electricity and leads to the loss of inside battery active material and then influence battery
Service life.Temperature is to influence an important factor for battery performance plays.Temperature is high, and battery-active is strong, energy can be effectively played, but
Temperature is excessively high, anode lattice structure bad stability, and the safety of respective battery reduces.Therefore, it is based on lithium ion battery
Polarization and Wen Sheng study lithium ion charging method, are of great significance.
Invention content
The deficiency of charging time and battery cycle life, this hair can not be taken into account to make up existing method of charging lithium-ion battery
Bright combination lithium ion battery electrochemical reaction mechanism itself and external electrical characteristic, based on lithium ion battery charging polarizing voltage limit
System and the warm ceiling system of charging, it is proposed that a kind of maximum acceptable charging current computational methods of lithium ion battery, in lossless electricity
Charging rate is improved under the premise of service life in pond.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of power lithium-ion battery maximum charging current computational methods, comprise the steps of：
Step (1)：The polarizing voltage that charges modeling, extracts polarizing voltage data of the specific SOC points under different rate of charge,
In the sections 5%-80%SOC, battery polarization voltage is with charging current multiplying power at linear approximate relationship, polarizing voltage Vp(SOC)
=k (SOC) * I+b (SOC)；
Step (2)：The maximum charging current for calculating polarizing voltage limitation determines SOC points, using a certain electric current constant current one
Charging, charging time are equal to the polarization time constant of this point, at the end of charging, are cut if battery terminal voltage is exactly equal to charge
Only voltage, then this electric current is the maximum charging current of the polarizing voltage limitation of SOC points thus
Step (3)：The maximum charging current of warm ceiling system is calculated, warm 5 DEG C of ceiling system is set in charging process, a certain
A charging originates SOC points, with electric current In constant-current charges to charge cutoff voltage, if the Wen Sheng of battery reaches exactly to warm ceiling
Value, then this charging current In is the maximum charging current based on warm ceiling of SOC points thus
Step (4)：Wen Sheng is considered in charging process and polarization limits, the maximum charge electricity of polarizing voltage limitation
Flow curve and the maximum charging current curve at the warm ceiling of charging are joined together, and obtain filling based on the maximum of Wen Sheng and polarization limitation
Electric current curve relies on the boundary charging current curve of the Wen Sheng and polarization limitation of proposition, proposes a kind of with SOC stepped changes
Charging current curve：It in 0-10%SOC, is pre-charged using 1/3C current versus cells, after 10%SOC, uses 5 DEG C of warm ceilings
The maximum charging current of system charges, and until this electric current intersects with the maximum charging current that polarization limits, hereafter need to only consider to polarize
Limitation changes a charging current every 5%SOC, is charged using the ladder-like electric current being gradually reduced, and so that it is no more than polarization and limits
The maximum charging current curve of system, when cell voltage is to charge cutoff voltage 4.2V, using constant-voltage charge.
Further, the maximum charging current of the polarization limitation is obtained using the method for matlab iterative calculation.
Compared to the prior art the present invention, has the following advantages and effect：With this with the charging current pair of SOC stepped changes
Lithium ion battery charges, while ensureing to charge rapidity, limitation polarizing voltage and ranges of the Wen Sheng in permission that charge
It is interior, it ensure that charging capacity, charge efficiency and charging security and battery life.Present invention combination lithium ion battery itself is electrochemical
Reaction mechanism and external electrical characteristic are learned, based on lithium ion battery charging polarizing voltage limitation and the warm ceiling system of charging, it is proposed that
A kind of maximum acceptable charging current computational methods of lithium ion battery, to improve charging speed under the premise of lossless battery life
Degree.It realizes method of charging lithium-ion battery and has taken into account charging time and battery cycle life, work well.
Description of the drawings
Fig. 1 be consider Wen Sheng and polarization limitation maximum charging current curve and based on maximum charging current curve with
The charging current curve of SOC stepped changes.
Specific implementation mode
The specific implementation mode of the disclosure is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited in following embodiments.
A kind of power lithium-ion battery maximum charging current computational methods, comprise the steps of：
Step (1)：The polarizing voltage that charges modeling.Polarizing voltage data of the specific SOC points under different rate of charge are extracted,
In the sections 5%-80%SOC, battery polarization voltage, at linear approximate relationship, defines polarization times accordingly with charging current multiplying power
Influence of the rate coefficient k characterization charging current multiplying powers to polarizing voltage, meaning is often to increase in specific SOC point charging currents multiplying power
1C, the increment of polarizing voltage, while defining polarization penalty coefficient b, wherein polarizing voltage Vp(SOC)=k (SOC) * I+b (SOC).
Using least squares identification parameter k and b.
Step (2)：The maximum charging current of polarization limitation is obtained using the method for matlab iterative calculation：In a certain SOC
Point, it is 1A that charging current initial value, which is first arranged, and the charging time is polarization time constant T, calculates the battery-end electricity at the end of charging
Pressure judges whether to be equal to charge cutoff voltage.If be equal to or more than, this electric current is maximum charging current；If it is lower,
It repeats the above steps after then increasing charging current.In 20%SOC to 95%SOC a maximum charge electricity is calculated every 1%SOC
Stream, you can obtain maximum charging current curve.
Step (3)：Lithium ion battery thermal model is established, the maximum charge electricity at warm ceiling is iterated to calculate by matlab
Stream：Started to charge up in a certain SOC points, first be arranged a smaller charging current initial value, calculate with this electric current constant-current charge to section
Only battery Wen Sheng when voltage, compared with rising limits value (5 DEG C) with temperature, if battery Wen Sheng is more than or equal to temperature and rises limits value, this
I.e. maximum charging current of the SOC points based on warm ceiling increases and fills if battery Wen Sheng is less than warm ceiling system a electric current thus
Electric current, and repeat the above steps, rise limits value until battery Wen Sheng is more than or equal to temperature.
In formula, R is battery DC internal resistance, and convective heat-transfer coefficients of the h between battery surface and ambient enviroment, A is battery list
Body and ambient enviroment contact surface area,For entropy coefficient, TcellFor battery temperature, Tamb is ambient temperature, and m is battery matter
Amount, c are the mean specific heat of battery.
Step (4)：Wen Sheng is considered in charging process and polarization limits, the maximum charge electricity of polarizing voltage limitation
Flow curve and the maximum charging current curve at the warm ceiling of charging are joined together, and obtain filling based on the maximum of Wen Sheng and polarization limitation
Electric current curve.The maximum charging current curve that relies on the Wen Sheng proposed and polarization limitation proposes a kind of with SOC stepped changes
Charging current curve：It in 0-10%SOC, is pre-charged using 1/3C current versus cells, after 10%SOC, uses 5 DEG C of warm ceilings
The maximum charging current of system charges, and until this electric current intersects with the maximum charging current that polarization limits, hereafter need to only consider to polarize
Limitation changes a charging current every 5%SOC, is charged using the ladder-like electric current being gradually reduced, and so that it is no more than polarization and limits
The maximum charging current curve of system.When cell voltage is to charge cutoff voltage 4.2V, using constant-voltage charge.Charging result such as table
Shown in 1：
1 charging result of table
The experimental results showed that compared to average multiplying power and the CCCV chargings of 1/3C multiplying powers, from charging original state SOC=0% to
Cell voltage reaches charge cutoff voltage 4.2V during this, and the charging capacity based on bound current charging is most, constant pressure
Time used in charging stage is also obviously reduced, and constant-voltage phase charging capacity is minimum.In entire charging process, it is based on using this
Time used in bound current charging method is minimum, but charging capacity is most.
Described in this specification above content is only illustrations made for the present invention.Technology belonging to the present invention
The technical staff in field can make various modifications or additions to the described embodiments or by a similar method
It substitutes, content without departing from description of the invention or beyond the scope defined by this claim should all belong to this
The protection domain of invention.
Claims (2)
1. a kind of power lithium-ion battery maximum charging current computational methods, which is characterized in that comprise the steps of：
Step (1)：The polarizing voltage that charges modeling, extracts polarizing voltage data of the specific SOC points under different rate of charge,
In the sections 5%-80%SOC, battery polarization voltage is with charging current multiplying power at linear approximate relationship, polarizing voltage Vp(SOC)=k
(SOC)×I+b(SOC)；
Step (2)：The maximum charging current for calculating polarizing voltage limitation is determined SOC points one, is filled using a certain electric current constant current
Electricity, the charging time is equal to the polarization time constant of this point, at the end of charging, if battery terminal voltage is exactly equal to charge cutoff
Voltage, then this electric current is the maximum charging current of the polarizing voltage limitation of SOC points thus
In step (2), b indicates that the polarization penalty coefficient of definition, SOC refer to the state-of-charge of battery, VpIndicate battery polarization voltage,
TcellIndicate that battery temperature, h indicate that the convective heat-transfer coefficient between battery surface and ambient enviroment, A indicate battery cell and surrounding
Environment contact surface area, c indicate that the mean specific heat of battery, m indicate that battery quality, Tamb indicate that ambient temperature, k indicate
Polarize multiplying power factor, and R indicates battery DC internal resistance；
Step (3)：Warm 5 DEG C of ceiling system is arranged in the maximum charging current for calculating warm ceiling in charging process, fills at some
Electrical initiation SOC points, with electric current In constant-current charges to charge cutoff voltage, if the Wen Sheng of battery reaches exactly to temperature limit, that
This charging current In is the maximum charging current based on warm ceiling of SOC points thus
In step (3),Indicate entropy coefficient；
Step (4)：Wen Sheng is considered in charging process and polarization limits, and the maximum charging current polarizing voltage limitation is bent
Line and the maximum charging current curve at the warm ceiling of charging are joined together, and the maximum charge electricity based on Wen Sheng and polarization limitation is obtained
Flow curve relies on the boundary charging current curve of the Wen Sheng and polarization limitation of proposition, proposes a kind of charging with SOC stepped changes
Current curve：It in 0-10%SOC, is pre-charged using 1/3C current versus cells, after 10%SOC, uses 5 DEG C of warm ceilings
Maximum charging current charges, and until this electric current intersects with the maximum charging current of polarization limitation, hereafter need to only consider to polarize limits,
Change a charging current every 5%SOC, charged using the ladder-like electric current being gradually reduced, it is made to be no more than polarization limitation
Maximum charging current curve, when cell voltage is to charge cutoff voltage 4.2V, using constant-voltage charge.
2. a kind of power lithium-ion battery maximum charging current computational methods according to claim 1, which is characterized in that institute
The maximum charging current for stating polarization limitation is obtained using the method for matlab iterative calculation.
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| CN105552465B (en) * | 2015-12-03 | 2018-05-08 | 北京交通大学 | It is a kind of that charging method is optimized based on the lithium ion battery of time and temperature |
| EP3197006B1 (en) * | 2016-01-21 | 2021-06-16 | Samsung Electronics Co., Ltd. | Apparatus and method of charging battery pack |
| CN107039696B (en) * | 2016-11-29 | 2019-04-05 | 北京交通大学 | A kind of track traffic vehicle carries the optimization charging method of energy storage lithium ion battery |
| CN107332316B (en) * | 2017-08-23 | 2021-11-02 | 努比亚技术有限公司 | Stepped charging method, mobile terminal and computer-readable storage medium |
| CN107704658B (en) * | 2017-09-07 | 2021-09-03 | 南方电网科学研究院有限责任公司 | Method for verifying accuracy of maximum temperature rise calculated by simplified model |
| CN110797597B (en) * | 2018-08-01 | 2023-03-14 | 深圳市比克动力电池有限公司 | Constant-voltage step charging method for lithium ion battery |
| CN109245229A (en) * | 2018-10-26 | 2019-01-18 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of evaluation method, the device in remaining battery charging time |
| CN109888834B (en) * | 2019-04-15 | 2020-12-15 | 河南省科学院能源研究所有限公司 | Photovoltaic power generation system based on improved MPPT method and storage battery self-balancing quick charging coupling control |
| CN111029670B (en) * | 2019-10-31 | 2022-06-17 | 合肥国轩高科动力能源有限公司 | Quick charging method for lithium ion battery |
| CN111092272B (en) * | 2019-12-18 | 2023-04-18 | 湖南大学 | Lithium ion battery three-stage charging method considering internal resistance characteristic |
| WO2021155539A1 (en) * | 2020-02-06 | 2021-08-12 | 宁德新能源科技有限公司 | Charging method, electronic device and storage medium |
| WO2021155538A1 (en) * | 2020-02-06 | 2021-08-12 | 宁德新能源科技有限公司 | Charging method, electronic device and storage medium |
| CN112952962B (en) * | 2021-04-13 | 2021-10-15 | 深圳市晶讯技术股份有限公司 | Charging current control method and device based on temperature parameters |
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