CN101777674A - High-capacity lithium-ion battery backup state managing method - Google Patents
High-capacity lithium-ion battery backup state managing method Download PDFInfo
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- CN101777674A CN101777674A CN201010118217A CN201010118217A CN101777674A CN 101777674 A CN101777674 A CN 101777674A CN 201010118217 A CN201010118217 A CN 201010118217A CN 201010118217 A CN201010118217 A CN 201010118217A CN 101777674 A CN101777674 A CN 101777674A
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a high-capacity lithium-ion battery backup state managing method, which mainly comprises a battery assembly and a control management part, and is characterized in that: the battery assembly is formed by serially joining three lithium-ion batteries, the control management part mainly comprises a single chip and a charging part, wherein the single chip monitors different status of the battery assembly including voltage, current and temperature; the single chip generates a PWM control signal, the PWM control signal can control the connection and disconnection of a charging circuit so as to perform the pulse width modulation and to control the charging voltage and current. The high-capacity lithium-ion battery backup state managing method has the advantages that: the pulse charging is combined with the backup state managing way, so the realization is simple, and the reliability is high. The problem that the service life of the battery assembly is seriously reduced under the high charge state can be effectively postponed. The difficulties of the prior art can be fundamentally solved. The pollution of the ecological environment caused by the waste lithium batteries can be reduced so as to protect the ecological environment and to save the nonrenewable resource used in the production of the lithium battery.
Description
Technical field
The present invention relates to the charging management method of battery, refer more particularly to a kind of lithium-ion battery backup state managing method.
Background technology
In the existing lithium ion battery management system, when the reserve attitude was used, battery all was to charge with the CC/CV pattern, and battery is full of fully on market.Because lithium ion battery is in highly charged state for a long time, even charge and discharge cycles did not take place battery, the decay of the life-span of battery also can be very fast, and normal temperature has only 2 years following useful life, the life-span shortened especially greatly when hot environment was used, typical battery as notebook computer.Along with the popularization of electronic product is used, there is every year a large amount of lithium batteries to begin to discard, very unripe, therefore very big to recovery and the treatment technology of scrapping lithium battery to the potential destruction of environment.If can prolong portable power source system useful life, not only environmental protection is of great importance, also reduced user's spending simultaneously.Lithium battery prolongs the consumption of also having saved non-renewable resources useful life, and its indirect social effect is great.Although every block of electric energy that consumes portable power source system every day is little, its recoverable amount is huge, if every of newly-increased portable power source system is energy-conservation 30%～40%, then annual energy-saving benefit is above 300,000,000 yuan.
In publication number is the patent documentation of CN 1905309A, disclose a kind of charge control method of lithium battery and control system, influenced the lithium battery problem in useful life to solve existing charge control method.
Its concrete technical scheme is: a kind of charge control method of lithium battery comprises the steps:
A1, detection lithium battery capacity begin lithium battery is charged and execution in step A2 when lithium battery capacity is equal to or less than first lower limit;
A2, detect lithium battery capacity in the charging process in real time, when lithium battery capacity is equal to or greater than first higher limit, stop charging and return steps A 1.
In the described steps A 1, the method that detects lithium battery capacity is to detect once first stand-by period that detection in real time and/or every interval are set.
Described first higher limit is 30%～60% of a lithium battery full charge capacity;
Described first lower limit is 5%～10% of a lithium battery nominal capacity;
Described first stand-by period is 24～48 hours.
A kind of charge control method of lithium battery comprises the steps:
B1, reception charge mode selection instruction, and declare described instruction and still carry out second charge mode for carrying out first charge mode, if first charge mode then continues step B2; Otherwise change step B4 over to;
B2, detection lithium battery capacity begin lithium battery is charged and execution in step B3 when lithium battery capacity is equal to or less than first lower limit;
B3, detect lithium battery capacity in the charging process in real time, when lithium battery capacity is equal to or greater than first higher limit, stop charging and return step B2;
B4, detection lithium battery capacity begin lithium battery is charged and execution in step B5 when lithium battery capacity is equal to or less than second threshold value;
B5, detect lithium battery capacity in the charging process in real time, when lithium battery capacity equals full charge capacity, stop charging and return step B4.
This invention provides a kind of method according to optimum capacity and lowest limit control charging, the longer term storage peak capacity of lithium battery is remained on 40%～50% of best full charge capacity, with reduce lithium battery from loss and prolong useful life of lithium battery, simultaneously, start charging according to the minimum lithium battery nominal capacity of setting 5%～10%.
The weak point that exists in the foregoing invention is: one, battery all is to charge with traditional CC/CV pattern, when charging, easily produce the battery polarization effect, still cause shorter battery life, can not fundamentally solve the shorter battery life problem that causes because of the battery polarization effect; Two, also just because of last described reason, this charging scheme is that the longer term storage peak capacity with lithium battery remains on 40%～50% of best full charge capacity, can not satisfy the demand of highly charged capacity in the reality.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point of the prior art and a kind of lithium-ion battery backup state managing method is provided.In more piece connection in series-parallel battery pack, to the battery pack that the reserve attitude is used, management in the following ways, with the useful life of effective prolongation battery:
The present invention realizes in the following way: the present invention mainly includes battery pack and control and management part, and wherein battery pack is that 3 joint lithium ion batteries are composed in series.Control and management partly mainly includes single-chip microcomputer and live part, and wherein: single-chip microcomputer is monitored the various states of battery pack, comprises voltage, electric current, temperature.Single-chip microcomputer produces pwm control signal, and this signal can be controlled the break-make of charging circuit, carries out pulse width modulation, thus control charging voltage and electric current.
Its management method of described live part is:
1. when the voltage of electric core is lower than 2.5V, battery pack is carried out trickle charge, charging current is 0.1C.
2. when the voltage of electric core reaches 4.1V, transfer pulse current charge to.The width of pulse is for fixing 1S, and after pulse, cell voltage can slowly descend, when dropping to 4.1V, carry out the pulse current charge of a 1S duration again, the interval between pulse is during greater than 5S, think that battery has been filled to 95% capacity, stop pulse charging at this moment.
3. after battery stops filling, utilize the little power consumption in battery self-discharge and the circuit, make electric core voltage slowly drop to 4V, recover charging again, be charged to 95% capacity again up to electric core voltage, so circulation.
The invention has the advantages that: adopt pulse current charge to combine, realize simply the reliability height with reserve attitude way to manage.Can effectively delay the rapid attenuation problem of life-span under the highly charged state of battery pack.Fundamentally solve the difficult problem of prior art.Reduce the pollution of waste lithium cell, thereby protected biological environment, and saved the non-renewable resources of being utilized in the lithium battery production biological environment.
Description of drawings
Fig. 1 impulse circuit structural representation of the present invention;
Fig. 2 management method figure hoist pennants of the present invention;
Fig. 3 electrical block diagram of the present invention;
Embodiment
The specific embodiment of the invention now is described in detail in detail in conjunction with the accompanying drawings: the present invention mainly includes battery pack and control and management part, wherein battery pack is that 3 joint lithium ion batteries are composed in series, the control and management part is mainly by single-chip microcomputer and live part, wherein: single-chip microcomputer is monitored the various states of battery pack, comprises voltage, electric current, temperature etc.Single-chip microcomputer produces pwm control signal, and this signal can be controlled the break-make of charging circuit, carries out pulse width modulation, thus control charging voltage and electric current.
Shown in module among Fig. 31, whole battery group is that 3 joint lithium ion batteries are composed in series.
Single-chip microcomputer (N2) is monitored the various states of battery pack and is sampled, and delivers N2 and handles.The battery parameter of delivering comprises cell voltage, electric current, temperature etc.
It is the samplings of 3 parts that voltage sample is divided into, and comprises 1,2 in series-connected cell and 3 batteries.After adopting the voltage of battery different electric resistance partial pressures than dividing potential drop, give ADC (analog to digital converter) the ALT-CH alternate channel pin of single-chip microcomputer N2, hand over N2 to carry out computing, realize detection to the voltage signal of battery.Among sampling module such as Fig. 3 shown in 2,3,4 partial circuits.The voltage sample of battery 1 is directly given the 24th pin of N2 by R23, battery 1 and 2 voltage with the dividing potential drop step-down of crossing resistance R 21 and R22 after, give the 23rd pin of N2, after battery 1,2 and 3 the dividing potential drop of total voltage, give the 22nd pin of N2 through resistance R 10 and R11;
Current sample is divided into charging current sampling and discharging current sampling, and two kinds of sample modes are different.The charging current sampling is shown in module 5, on the little resistance high-power resistance R40 of a precision, produce pressure drop by charging current, the pressure drop before and after the sample resistance sampling is sampled, the 3rd pin and the 7th pin of giving N2 carry out computing, thereby obtain the charging current of adapter to battery again.
Discharging current detects shown in module 8, by detecting the voltage that discharging current is produced at the high-power sampled resistance R 5 of the accurate little resistance of negative pole end and R30, and carry out homophase by the N5 operational amplifier and amplify, the 21st pin judgment processing of delivering N2, thereby the discharging current of acquisition battery.
The temperature sampling is shown in module 9; variation by a NTC (negative temperature coefficient resister) RT1 obtains; concrete testing process is for by fixed value resistance R37 with the NTC resistance R T1 of the temperature change in resistance dividing potential drop to given voltage; send the 4th pin of N2 to carry out the AD processing; compare with the temperature partial pressure value of setting; thereby draw temperature value, carry out alarm of battery excess temperature and protection.
The charging control circuit of battery is shown in module 6 and 7, when battery at voltage greater than 4.1V, when needing pulse current charge, the 13rd pin by single-chip microcomputer produces pwm control signal, drive signal is recommended in V9 and V11 generation by level after the integrated circuit driving of V5 fast, drive the duty ratio of V2 charging control, carry out pulse width modulation with MOS, thus control charging voltage and charging current.
When the voltage of electric core reached 4V1, charging modes transferred pulse current charge to.The width of pulse is for fixing 1S, and after pulse, cell voltage can slowly descend, when dropping to 4.1V, carry out the pulse current charge of a 1S duration again, the interval between pulse is during greater than 5S, think that battery has been filled to 95% capacity, stop pulse charging at this moment.
When the voltage that detects electric core as N2 has the 2.5V of being lower than, by charge control module, the charging modes of battery pack is set at the trickle mode, the control charging current is 0.1C.
After battery stops filling, utilize the self-discharge of battery and the little power consumption in the management system circuit, make electric core voltage slowly drop to 4V, recover charging again, be charged to 95% capacity again up to electric core voltage.So circulation.
Claims (2)
1. high-capacity lithium-ion battery backup state managing method, mainly include battery pack and control and management part, it is characterized in that: described battery pack is that 3 joint lithium ion batteries are composed in series, described control and management partly mainly includes single-chip microcomputer and live part, wherein single-chip microcomputer is monitored the various states of battery pack, comprises voltage, electric current, temperature; Single-chip microcomputer produces pwm control signal, and this signal can be controlled the break-make of charging circuit, carries out pulse width modulation, thus control charging voltage and electric current.
2. a kind of high-capacity lithium-ion battery backup state managing method according to claim 1 is characterized in that: its management method of described live part is:
A) when the voltage of electric core is lower than 2.5V, battery pack is carried out trickle charge, charging current is 0.1C;
B) when the voltage of electric core reaches 4.1V, transfer pulse current charge to; The width of pulse is for fixing 1S, and after pulse, cell voltage can slowly descend, when dropping to 4.1V, carry out the pulse current charge of a 1S duration again, the interval between pulse is during greater than 5S, think that battery has been filled to 95% capacity, stop pulse charging at this moment;
C) after battery stops filling, utilize the little power consumption in battery self-discharge and the circuit, make electric core voltage slowly drop to 4V, recover charging again, be charged to 95% capacity again up to electric core voltage, so circulation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158233A (en) * | 2013-05-14 | 2014-11-19 | 产晶积体电路股份有限公司 | Determination method for charging ending point |
| CN105811024A (en) * | 2014-12-30 | 2016-07-27 | 苏州宝时得电动工具有限公司 | Battery maintenance method and battery management system |
| CN108711909A (en) * | 2018-06-13 | 2018-10-26 | 广东小天才科技有限公司 | Lithium battery charging method, device, electronic equipment and the storage medium of electronic equipment |
| CN109962302A (en) * | 2017-12-14 | 2019-07-02 | 丰田自动车株式会社 | The capacity restoration method of battery system and lithium ion secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104158233A (en) * | 2013-05-14 | 2014-11-19 | 产晶积体电路股份有限公司 | Determination method for charging ending point |
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| CN105811024A (en) * | 2014-12-30 | 2016-07-27 | 苏州宝时得电动工具有限公司 | Battery maintenance method and battery management system |
| CN109962302A (en) * | 2017-12-14 | 2019-07-02 | 丰田自动车株式会社 | The capacity restoration method of battery system and lithium ion secondary battery |
| CN109962302B (en) * | 2017-12-14 | 2022-05-06 | 丰田自动车株式会社 | Battery system and capacity recovery method for lithium ion secondary battery |
| CN108711909A (en) * | 2018-06-13 | 2018-10-26 | 广东小天才科技有限公司 | Lithium battery charging method, device, electronic equipment and the storage medium of electronic equipment |
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| CN101777674B (en) | 2012-07-18 |
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Inventor after: Guo Quanzeng Inventor after: Yu Feng Inventor before: Yu Feng |
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