CN110515004A - A kind of lithium ion battery charge and discharge circulation life calculation method - Google Patents
A kind of lithium ion battery charge and discharge circulation life calculation method Download PDFInfo
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- CN110515004A CN110515004A CN201910951773.0A CN201910951773A CN110515004A CN 110515004 A CN110515004 A CN 110515004A CN 201910951773 A CN201910951773 A CN 201910951773A CN 110515004 A CN110515004 A CN 110515004A
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- lithium ion
- ion battery
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The present invention relates to a kind of lithium ion battery charge and discharge circulation life calculation methods, belong to energy storage technology research field.The present invention is based on lithium ion batteries to apply in New-energy power system, provide the calculation method of battery cycle life, this method is able to solve lithium ion battery and calculates the problem of battery cycle life can not be assessed when scene differs greatly in practical application scene and national regulations, under practical application scene cycle life and economy measuring and calculating it is significant.
Description
Technical field
The present invention relates to a kind of lithium ion battery charge and discharge circulation life calculation methods, belong to energy storage technology research field.
Background technique
New-energy power system is primarily referred to as generating electricity using steam-electric power plant, wind power plant, the electric power
The power generation realtime power that is mainly characterized by of system is influenced by weather condition, has the spies such as power generation randomness, intermittence, fluctuation
Point.Lithium ion battery is a kind of secondary cell that can carry out multiple charge and discharge, it relies primarily on lithium ion in positive and negative pole material
Deintercalation, electronics complete the charging and discharging of battery in outer circuit cycles.Common lithium ion battery due to positive electrode not
It is same to be divided into ferric phosphate lithium ion battery, ternary NCA lithium ion battery, ternary NCM lithium ion battery etc..Charge and discharge cycles are
Refer to a battery once full charge and discharge cycles for being known as battery full of the process put.
The features such as power generation fluctuations of the new energy such as photovoltaic, wind-powered electricity generation, intermittence and randomness the receiving bring to power grid
Huge challenge, abandonment, abandoning optical phenomenon are universal, west area especially relatively high in new energy infiltration ratio.In order to promote electricity
Net receives the ability of the new energy such as photovoltaic, wind-powered electricity generation, reduces " abandoning light abandonment " phenomenon, the energy storage technology of research and development electric system
Have become the key link of new energy development.
Currently, the energy storage technology for being applied to electric system mainly includes mechanical energy storage, electrochemical energy storage, water-storage, heat
Energy storage etc..Wherein, lithium ion battery energy storage is due to having not by advantages such as geographical environment restriction, easy to remove, fast response times,
It is accounted in New-energy power system energy storage scene relatively high, is the most widely used energy storage technology of New-energy power system.
The charge and discharge circulation life of lithium ion battery is the important indicator of battery, directly affect battery economy, can
By property.In 25 DEG C of temperature, full charge expires the charge and discharge cycles that discharge process is known as battery to lithium ion battery next time, i.e., electric
Pond is charged to 100% electricity from 0 state of charge, and from such a complete charge and discharge process of 100% corona discharge to 0 electricity
Referred to as 1 charge and discharge cycles (as shown in Fig. 1).Charge and discharge cycles, charge/discharge capacity decaying are carried out full of the state put with full
Number when to rated capacity 80% is known as the charge and discharge circulation life of lithium ion battery.In the new energy such as photovoltaic, wind-powered electricity generation electricity
In Force system, the application operating condition of lithium ion battery is extremely complex, it may appear that the case where charge and discharge process frequently mutually switches is (such as attached
Shown in Fig. 2), and the service life in order to maintain battery, it is not recommended that battery carries out depth charge and discharge, and (usual depth of discharge is by the end of 5%
Left and right).The charge and discharge circulation life of existing energy-storage battery is calculated according to the model of attached drawing 1, i.e., battery it is fully charged after
It can just start to discharge, just will do it charging after battery discharge is complete, charge and discharge process is relatively independent.But in new energy electric power system
In system, due to the new energy such as photovoltaic, wind-powered electricity generation power generation fluctuation, intermittence and randomness the features such as, the operation of energy-storage battery is more
For complexity, the charge and discharge mode of battery, which will appear, to be switched fast, frequently situation alternately, leads to the charge and discharge of energy-storage battery
Circulation can not be calculated accurately.
It is electric when practical application scene and national regulations scene differ greatly in order to solve lithium ion battery in industry at present
The problem of pond cycle life can not be assessed, the following formula generallyd use calculate to assess:
In formula, Q is always that lithium ion battery adds up charge or discharge electricity, QIt is specifiedFor the rated capacity of battery, n is battery
The number of charge and discharge.Since lithium ion battery can have capacity attenuation in continuous charge and discharge process, whole life cycle
Maximum capacity decaying reachable 20%, therefore formula steady state value QIt is specifiedThe charge and discharge number that measurement calculates battery can generate larger inclined
Difference, the assessment for having seriously affected energy-storage battery charge and discharge cycles number calculate.
Currently, all lithium ion batteries provide the charge and discharge number system of battery in New-energy power system using Shi Junwei
Meter, this is primarily due to lithium ion battery and differs in practical application scene with scene as defined in charge and discharge circulation life test request
It is larger to cause, cause the use of lithium ion battery to have very big blindness, directly affects the economy and reliability of lithium ion battery
Assessment.So the art needs a kind of more reliable lithium ion battery charge and discharge circulation life calculation method.
Summary of the invention
The purpose of the present invention is having very big blindness for the use for solving current lithium ion battery, a kind of reliable lithium is needed
The technical issues of ion battery charge and discharge circulation life calculation method.
To achieve the purpose that solve the above problems, filled the technical solution adopted by the present invention is that providing a kind of lithium ion battery
Discharge cycles Life Calculating Methods, which is characterized in that the decaying of lithium ion battery is calculated using the state-of-charge of lithium ion battery
Rate, method are as follows:
Step 1: setting constraint condition, for lithium ion battery, the decaying in life cycle is linear, lithium ion
The capacity attenuation of battery is no more than 20%, i.e.,
η is lithium ion battery attenuation rate in formula；Capacity when Q1 is lithium ion battery initial SOC=100%；SOC (t) is
The SOC value of battery of statistics cut-off t moment；Q2 is the capacity for counting moment lithium ion battery；The present invention is suitable for η≤20%.
Step 2: statistics lithium ion battery charging capacity, charging when record initial SOC=100% of lithium ion battery is held
Amount；The capacity of the lithium ion battery of SOC (t) value and corresponding SOC (t) value is recorded and counts, SOC (t) value is statistics cut-off t moment
SOC value of battery；Calculate the accumulative charging capacity of lithium ion battery.
Step 3: since the state-of-charge SOC of lithium ion battery is, lithium ion battery corresponding with the capacity of battery
Initial capacity is the first time charging capacity of lithium ion battery when SOC=100%, therefore the battery capacity of t moment will also convert
For the capacity of SOC=100%.In addition capacity attenuation of the lithium ion battery in life cycle is linear, therefore battery is from making
With t moment is begun to shut off, the electricity that lithium ion battery is full of every time can be averaged processing, according to above method, use with
Lower formula calculates lithium ion battery charging times:
N is lithium ion battery charging times in formula；Capacity when Q1 is lithium ion battery initial SOC=100%；SOC(t)
For the SOC value of battery of statistics cut-off t moment；Q2 is the capacity for counting moment lithium ion battery；ΣQChargingFor the tired of lithium ion battery
Count charging capacity.
Step 4: obtaining lithium ion battery charge and discharge circulation life according to lithium ion battery charging times.
The present invention provides a kind of lithium ion charge discharge life calculation methods based on lithium ion battery decaying.It constrains item
Part is to comprehensively consider the attenuation rate of battery no more than 20%, when being more than 20% such as attenuation rate, cell decay rate be it is non-linear, this
Calculation method is not applicable.
Compared with prior art, the invention has the following beneficial effects:
By automatic data collection and automatic calculating, considers the factor of energy-storage battery capacity attenuation, improve energy-storage battery
Charge discharge life statistical accuracy, be conducive to energy-storage battery electric system application when economy and reliability assessment.
Detailed description of the invention
Fig. 1 is current energy-storage battery routine charge and discharge operation schematic diagram.
Fig. 2 is the practical charge and discharge operation schematic diagram of energy-storage battery in current New-energy power system
Specific embodiment
In order to make the present invention more obvious and understandable, cooperation attached drawing is described in detail below:
The present invention provides a kind of lithium ion battery charge and discharge circulation life calculation method, which is characterized in that utilizes lithium ion
The state-of-charge of battery calculates the attenuation rate of lithium ion battery, method are as follows:
Step 1: setting constraint condition, for lithium ion battery, the decaying in life cycle is linear, lithium ion
The capacity attenuation of battery is no more than 20%, i.e.,
η is lithium ion battery attenuation rate in formula；Charging capacity when Q1 is lithium ion battery initial SOC=100%；SOC
It (t) is the SOC value of battery of statistics cut-off t moment；Q2 is the charging capacity for counting moment lithium ion battery；The present invention is suitable for η
≤ 20%.
Step 2: statistics lithium ion battery charging capacity, charging when record initial SOC=100% of lithium ion battery is held
Amount；The charging capacity of the lithium ion battery of SOC (t) value and corresponding SOC (t) value is recorded and counts, SOC (t) value is statistics cut-off t
The SOC value of battery at moment；Calculate the accumulative charging capacity of lithium ion battery.
Step 3: since the state-of-charge SOC of lithium ion battery is, lithium-ion electric corresponding with the charging capacity of battery
Initial charge capacity is the first time charging capacity of lithium ion battery when the SOC=100% of pond, therefore the battery of t moment charges and holds
Amount will also be converted into the charging capacity of SOC=100%.In addition capacity attenuation of the lithium ion battery in life cycle is linear
, therefore battery is begun to shut off to t moment from using, the electricity that lithium ion battery is full of every time can be averaged processing, according to
Above method calculates lithium ion battery charging times using following formula:
N is lithium ion battery charging times in formula；Charging capacity when Q1 is lithium ion battery initial SOC=100%；
SOC (t) is the SOC value of battery of statistics cut-off t moment；Q2 is the charging capacity for counting moment lithium ion battery；Σ Q is charged as lithium
The accumulative charging capacity of ion battery.
Step 4: obtaining lithium ion battery charge and discharge circulation life according to lithium ion battery charging times.
The above, only presently preferred embodiments of the present invention, not to the present invention in any form with substantial limitation,
It should be pointed out that under the premise of not departing from the present invention, can also be made several for those skilled in the art
It improves and supplement, these improvement and supplement also should be regarded as protection scope of the present invention.All those skilled in the art, not
Be detached from the spirit and scope of the present invention in the case where, when a little change made using disclosed above technology contents,
Modification and the equivalent variations developed, are equivalent embodiment of the invention；Meanwhile all substantial technologicals according to the present invention are to above-mentioned
The variation, modification and evolution of any equivalent variations made by embodiment, in the range of still falling within technical solution of the present invention.
Claims (1)
1. a kind of lithium ion battery charge and discharge circulation life calculation method, which is characterized in that utilize the charged shape of lithium ion battery
State calculates the attenuation rate of lithium ion battery, method are as follows:
Step 1: setting constraint condition, for lithium ion battery, the decaying in life cycle is linear, lithium ion battery
Capacity attenuation no more than 20%, i.e.,
η is lithium ion battery attenuation rate in formula；Charging capacity when Q1 is lithium ion battery initial SOC=100%；SOC (t) is
The SOC value of battery of statistics cut-off t moment；Q2 is the charging capacity for counting moment lithium ion battery；The present invention be suitable for η≤
20%.
Charging capacity step 2: statistics lithium ion battery charging capacity, when the record initial SOC=100% of lithium ion battery；Note
The charging capacity of the lithium ion battery of SOC (t) value and corresponding SOC (t) value is recorded and counts, SOC (t) value is statistics cut-off t moment
SOC value of battery；Calculate the accumulative charging capacity of lithium ion battery.
Step 3: since the state-of-charge SOC of lithium ion battery is, lithium ion battery corresponding with the charging capacity of battery
Initial charge capacity is the first time charging capacity of lithium ion battery, therefore the battery charge capacity of t moment when SOC=100%
Also the charging capacity of SOC=100% is converted into.In addition capacity attenuation of the lithium ion battery in life cycle is linear,
Therefore battery is begun to shut off to t moment from using, and the electricity that lithium ion battery is full of every time can be averaged processing, according to above
Method calculates lithium ion battery charging times using following formula:
N is lithium ion battery charging times in formula；Charging capacity when Q1 is lithium ion battery initial SOC=100%；SOC(t)
For the SOC value of battery of statistics cut-off t moment；Q2 is the charging capacity for counting moment lithium ion battery；Σ Q is charged as lithium-ion electric
The accumulative charging capacity in pond.
Step 4: obtaining lithium ion battery charge and discharge circulation life according to lithium ion battery charging times.
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Cited By (2)
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| CN111707954A (en) * | 2020-06-18 | 2020-09-25 | 中汽研汽车检验中心（天津）有限公司 | Lithium iron phosphate power battery life prediction method |
| CN112528520A (en) * | 2020-12-28 | 2021-03-19 | 上海电气国轩新能源科技有限公司 | Method and device for predicting cycle number of lithium battery and storage medium |
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Application publication date: 20191129 |
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