CN109216788A - A kind of method for group matching and its battery pack of lithium ion battery - Google Patents

A kind of method for group matching and its battery pack of lithium ion battery Download PDF

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Publication number
CN109216788A
CN109216788A CN201710515257.4A CN201710515257A CN109216788A CN 109216788 A CN109216788 A CN 109216788A CN 201710515257 A CN201710515257 A CN 201710515257A CN 109216788 A CN109216788 A CN 109216788A
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CN
China
Prior art keywords
battery
lithium ion
voltage
battery pack
capacity
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Pending
Application number
CN201710515257.4A
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Chinese (zh)
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不公告发明人
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Qingdao Constant Jin Yuan Electronic Technology Co Ltd
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Qingdao Constant Jin Yuan Electronic Technology Co Ltd
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Priority to CN201710515257.4A priority Critical patent/CN109216788A/en
Publication of CN109216788A publication Critical patent/CN109216788A/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • H01M10/446Initial charging measures
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The present invention provides the method for group matching and its battery pack of a kind of lithium ion battery, wherein by storing under high temperature environment, accelerates the ageing of battery, amplify capacity fall of the battery during storage, to which capacity is close, while it is one group that the low battery of attenuation degree, which is matched,.Method for group matching provided by the invention can not only obtain battery pack similar in cell capacity, while the decaying of each single battery of battery pack also reaches unanimity, and improve the stability of battery pack operation.

Description

A kind of method for group matching and its battery pack of lithium ion battery
Technical field
The present invention relates to battery technology fields, more particularly to the method for group matching and its battery pack of a kind of lithium ion battery.
Background technique
With the fast development of lithium ion battery, lithium ion battery also starts largely to be answered as power, accumulation power supply With.The price of battery pack is high, and value is big, and to battery reliability and consistency, higher requirements are also raised.It is any in battery pack The functional failure of single battery, will lead to the functional failure of entire battery pack, or even can cause the safety mistake of battery The problems such as control.For the consistency for guaranteeing each single battery in battery pack, needs to screen battery, be grouped, to ensure battery The consistency of each single battery in group.
Summary of the invention
The present invention provides a kind of method for group matching of lithium ion battery, wherein accelerating battery by storing under high temperature environment Ageing, amplify capacity fall of the battery during storage, so that capacity is close, while the low battery of attenuation degree is matched It is one group.Method for group matching provided by the invention can not only obtain battery pack similar in cell capacity, while battery pack The decaying of each single battery also reaches unanimity, and improves the stability of battery pack operation.
Specific scheme is as follows:
A kind of method for group matching of lithium ion battery, step include:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.2-4.4V measures capacity of lithium ion battery, And it sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 10%;
3) it, in the environment of temperature is 40-70 DEG C, places 10-20 hours, measures capacity of lithium ion battery, it will be under capacity Lithium ion battery of the depreciation within 10% combo again.
Further, the blanking voltage of the step 1 is 4.2-4.3V
Further, the capacity difference of the step 2 is within 5%;The capacity drop-out value of the step 3 is within 5%.
Further, the blanking voltage is 4.25V;
Further, it is placed 15 hours in step 3.
Further, wherein the temperature in step 1 is 50-60 DEG C.
A kind of Li-ion batteries piles, method for group matching according to claim 1 obtain being formed with group battery, institute Stating battery pack further includes controller and detector, and the battery detector detects battery temperature and voltage, the controller system Fixed different operational mode, and be that single battery selects corresponding operational mode according to the battery information of battery detector feedback; The operational mode includes entire run mode and intelligent operation mode;In the entire run mode, the single battery In complete electric discharge by voltage and fully charged by carrying out charge and discharge cycles between voltage;When battery detector detects monomer When the temperature of battery is greater than the 105-110% of battery pack average cell temperature, the controller specifies the single battery to run intelligence It can operational mode;In the intelligent operation mode, the single battery intelligent charge by voltage and Intelligent discharge by Charge and discharge cycles between voltage, the intelligent charge meet following mathematics by voltage and the Intelligent discharge blanking voltage Formula:
Intelligent charge is by voltage (V)=fully charged by voltage-k* (single battery charging voltage change rate/battery Group average cell charging voltage change rate)
Intelligent discharge is by voltage (V)=electric discharge completely by voltage+b* (single battery discharge voltage change rate/battery Group average cell discharge voltage change rate)
K=t* (single battery temperature (DEG C)/battery pack average cell temperature -1)
B=s* (single battery temperature (DEG C)/battery pack average cell temperature -1)
The t is 0.6-0.8;The s is 0.1-0.3.
The invention has the following beneficial effects:
1, by storing under high temperature environment, accelerate the ageing of battery, amplify battery range of decrease under the capacity during storage Degree, so that capacity is close, while it is one group that the low battery of attenuation degree, which is matched,;
2, by specific operation management system, the cyclical voltage section of battery is controlled, the aging of battery is delayed;
3, the operation management system of battery, when the voltage change ratio when cell charging/discharging is higher, reduction/raising is cut Slow down the aging of battery to voltage to prevent the charge/discharge excessively of battery;
4, different with the degree of aging under low potential under high potential due to battery, battery-based temperature and electricity Different adjustment is arranged therefore in buckling rate, and the reasonable value range of charge/discharge blanking voltage is calculated.
Specific embodiment
The present invention will be described in more detail below by specific embodiment, but protection scope of the present invention not by It is limited to these embodiments.
Embodiment 1
Battery pack, the battery pack include 50 monomer lithium ion batteries, battery pack combo shape in the following manner At:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.2V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 10%;
3) it, in the environment of temperature is 40 DEG C, places 20 hours, measures capacity of lithium ion battery, capacity drop-out value is existed Lithium ion battery within 10% combo again, selects same group of 50 batteries, forms the battery pack;
The battery pack further includes controller and battery detector, the battery information packet of the battery detector detection The voltage and temperature of battery are included, the controller formulates different operational modes, and the operational mode includes entire run mode With intelligent operation mode;In the entire run mode, the single battery carries out charge and discharge cycles between 2.7-4.2V; When battery detector detect single battery temperature be greater than battery pack average cell temperature 105% when, the controller refers to The fixed single battery runs intelligent operation mode;In the intelligent operation mode, the single battery intelligent charge by By charge and discharge cycles between voltage, the intelligent charge is cut by voltage and the Intelligent discharge for voltage and Intelligent discharge Only voltage meets following mathematical expression:
Intelligent charge is by voltage=4.2-k* (single battery charging voltage change rate/battery pack average cell charging electricity Buckling rate)
Intelligent discharge is by voltage=2.7+b* (single battery discharge voltage change rate/battery pack average cell electric discharge electricity Buckling rate)
K=0.6* (single battery temperature/battery pack average cell temperature -1)
B=0.1* (single battery temperature/battery pack average cell temperature -1)
Embodiment 2
Battery pack, the battery pack include 50 monomer lithium ion batteries, battery pack combo shape in the following manner At:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.4V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 10%;
3) it, in the environment of temperature is 70 DEG C, places 10 hours, measures capacity of lithium ion battery, capacity drop-out value is existed Lithium ion battery within 10% combo again, selects same group of 50 batteries, forms the battery pack;
The battery pack further includes controller and battery detector, the battery information packet of the battery detector detection The voltage and temperature of battery are included, the controller formulates different operational modes, and the operational mode includes entire run mode With intelligent operation mode;In the entire run mode, the single battery carries out charge and discharge cycles between 2.7-4.2V; When battery detector detect single battery temperature be greater than battery pack average cell temperature 110% when, the controller refers to The fixed single battery runs intelligent operation mode;In the intelligent operation mode, the single battery intelligent charge by By charge and discharge cycles between voltage, the intelligent charge is cut by voltage and the Intelligent discharge for voltage and Intelligent discharge Only voltage meets following mathematical expression:
Intelligent charge is by voltage=4.2-k* (single battery charging voltage change rate/battery pack average cell charging electricity Buckling rate)
Intelligent discharge is by voltage=2.7+b* (single battery discharge voltage change rate/battery pack average cell electric discharge electricity Buckling rate)
K=0.7* (single battery temperature/battery pack average cell temperature -1)
B=0.2* (single battery temperature/battery pack average cell temperature -1)
Embodiment 3
Battery pack, the battery pack include 50 monomer lithium ion batteries, battery pack combo shape in the following manner At:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.25V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 5%;
3) it, in the environment of temperature is 60 DEG C, places 15 hours, measures capacity of lithium ion battery, capacity drop-out value is existed Lithium ion battery within 5% combo again, selects same group of 50 batteries, forms the battery pack;
The battery pack further includes controller and battery detector, the battery information packet of the battery detector detection The voltage and temperature of battery are included, the controller formulates different operational modes, and the operational mode includes entire run mode With intelligent operation mode;In the entire run mode, the single battery carries out charge and discharge cycles between 2.7-4.2V; When battery detector detect single battery temperature be greater than battery pack average cell temperature 110% when, the controller refers to The fixed single battery runs intelligent operation mode;In the intelligent operation mode, the single battery intelligent charge by By charge and discharge cycles between voltage, the intelligent charge is cut by voltage and the Intelligent discharge for voltage and Intelligent discharge Only voltage meets following mathematical expression:
Intelligent charge is by voltage=4.2-k* (single battery charging voltage change rate/battery pack average cell charging electricity Buckling rate)
Intelligent discharge is by voltage=2.7+b* (single battery discharge voltage change rate/battery pack average cell electric discharge electricity Buckling rate)
K=0.8* (single battery temperature/battery pack average cell temperature -1)
B=0.3* (single battery temperature/battery pack average cell temperature -1)
Embodiment 4
Battery pack, the battery pack include 50 monomer lithium ion batteries, battery pack combo shape in the following manner At:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.3V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 5%;
3) it, in the environment of temperature is 70 DEG C, places 10 hours, measures capacity of lithium ion battery, capacity drop-out value is existed Lithium ion battery within 5% combo again, selects same group of 50 batteries, forms the battery pack;
The battery pack further includes controller and battery detector, the battery information packet of the battery detector detection The voltage and temperature of battery are included, the controller formulates different operational modes, and the operational mode includes entire run mode With intelligent operation mode;In the entire run mode, the single battery carries out charge and discharge cycles between 2.7-4.2V; When battery detector detect single battery temperature be greater than battery pack average cell temperature 105% when, the controller refers to The fixed single battery runs intelligent operation mode;In the intelligent operation mode, the single battery intelligent charge by By charge and discharge cycles between voltage, the intelligent charge is cut by voltage and the Intelligent discharge for voltage and Intelligent discharge Only voltage meets following mathematical expression:
Intelligent charge is by voltage=4.2-k* (single battery charging voltage change rate/battery pack average cell charging electricity Buckling rate)
Intelligent discharge is by voltage=2.7+b* (single battery discharge voltage change rate/battery pack average cell electric discharge electricity Buckling rate)
K=0.6* (single battery temperature/battery pack average cell temperature -1)
B=0.3* (single battery temperature/battery pack average cell temperature -1)
Embodiment 5
Battery pack, the battery pack include 50 monomer lithium ion batteries, battery pack combo shape in the following manner At:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.2V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 8%;
3) it, in the environment of temperature is 50 DEG C, places 10 hours, measures capacity of lithium ion battery, capacity drop-out value is existed Lithium ion battery within 8% combo again, selects same group of 50 batteries, forms the battery pack;
The battery pack further includes controller and battery detector, the battery information packet of the battery detector detection The voltage and temperature of battery are included, the controller formulates different operational modes, and the operational mode includes entire run mode With intelligent operation mode;In the entire run mode, the single battery carries out charge and discharge cycles between 2.7-4.2V; When battery detector detect single battery temperature be greater than battery pack average cell temperature 105% when, the controller refers to The fixed single battery runs intelligent operation mode;In the intelligent operation mode, the single battery intelligent charge by By charge and discharge cycles between voltage, the intelligent charge is cut by voltage and the Intelligent discharge for voltage and Intelligent discharge Only voltage meets following mathematical expression:
Intelligent charge is by voltage=4.2-k* (single battery charging voltage change rate/battery pack average cell charging electricity Buckling rate)
Intelligent discharge is by voltage=2.7+b* (single battery discharge voltage change rate/battery pack average cell electric discharge electricity Buckling rate)
K=0.8* (single battery temperature/battery pack average cell temperature -1)
B=0.1* (single battery temperature/battery pack average cell temperature -1)
Comparative example 1
The system of battery pack including 50 single batteries, combo is formed the battery pack in the following manner:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.2V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 8%.
Test and result
By embodiment 1-5, the system of comparative example 1 carries out charge and discharge cycles respectively with the electric current of 1C, record the use of system Service life.As it can be seen that obtaining the higher service life using the battery pack of the embodiment of the present invention.
Table 1
Cycle-index
Embodiment 1 734
Embodiment 2 763
Embodiment 3 770
Embodiment 4 745
Embodiment 5 767
Comparative example 1 403
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it would be recognized that above-mentioned Description be not considered as limitation of the present invention.

Claims (7)

1. a kind of method for group matching of lithium ion battery, step include:
1) lithium ion battery, is charged into blanking voltage, blanking voltage 4.2-4.4V measures capacity of lithium ion battery, and presses It sorts according to amount of capacity;
2), the lithium ion battery combo by capacity difference within 10%;
3) it, in the environment of temperature is 40-70 DEG C, places 10-20 hours, capacity of lithium ion battery is measured, by capacity drop-out value Lithium ion battery within 10% combo again.
2. the method as described in claim 1, the blanking voltage of the step 1 is 4.2-4.3V.
3. the method as described in claim 1, the capacity difference of the step 2 is within 5%;The capacity drop-out value of the step 3 Within 5%.
4. the method as described in claim 1, the blanking voltage is 4.25V.
5. the method as described in claim 1, placed 15 hours in step 3.
6. the method as described in claim 1, wherein the temperature in step 1 is 50-60 DEG C.
7. a kind of Li-ion batteries piles, method for group matching according to claim 1 obtains being formed with group battery.
CN201710515257.4A 2017-06-29 2017-06-29 A kind of method for group matching and its battery pack of lithium ion battery Pending CN109216788A (en)

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Application Number Priority Date Filing Date Title
CN201710515257.4A CN109216788A (en) 2017-06-29 2017-06-29 A kind of method for group matching and its battery pack of lithium ion battery

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CN109216788A true CN109216788A (en) 2019-01-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102468656A (en) * 2010-11-04 2012-05-23 凹凸电子(武汉)有限公司 Charging control device, method and battery management system
CN104409779A (en) * 2014-11-20 2015-03-11 合肥国轩高科动力能源股份公司 Pack matching method of lithium ion battery modules
CN105489952A (en) * 2016-01-08 2016-04-13 深圳市沃特玛电池有限公司 Matching method for improving self-discharge consistency of lithium iron phosphate power battery pack
CN105633472A (en) * 2015-12-30 2016-06-01 山东精工电子科技有限公司 Self-discharge rate consistency matching and screening method for lithium-ion battery
CN106785122A (en) * 2017-01-09 2017-05-31 洪泽宇 A kind of smart home lithium ion battery grouping method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102468656A (en) * 2010-11-04 2012-05-23 凹凸电子(武汉)有限公司 Charging control device, method and battery management system
CN104409779A (en) * 2014-11-20 2015-03-11 合肥国轩高科动力能源股份公司 Pack matching method of lithium ion battery modules
CN105633472A (en) * 2015-12-30 2016-06-01 山东精工电子科技有限公司 Self-discharge rate consistency matching and screening method for lithium-ion battery
CN105489952A (en) * 2016-01-08 2016-04-13 深圳市沃特玛电池有限公司 Matching method for improving self-discharge consistency of lithium iron phosphate power battery pack
CN106785122A (en) * 2017-01-09 2017-05-31 洪泽宇 A kind of smart home lithium ion battery grouping method

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