CN104377396A - Lithium battery pack charging method - Google Patents
Lithium battery pack charging method Download PDFInfo
- Publication number
- CN104377396A CN104377396A CN201410621731.8A CN201410621731A CN104377396A CN 104377396 A CN104377396 A CN 104377396A CN 201410621731 A CN201410621731 A CN 201410621731A CN 104377396 A CN104377396 A CN 104377396A
- Authority
- CN
- China
- Prior art keywords
- charging
- current
- constant
- battery
- set point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007600 charging Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 17
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000000178 monomer Substances 0.000 claims description 24
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract 2
- 238000010280 constant potential charging Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 239000005955 Ferric phosphate Substances 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H02J7/0027—
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a lithium battery pack charging method. According to the lithium battery pack charging method, the diversity of single cells is gradually reduced by adopting four stages of a constant-current pre-charging mode, a constant-current equalizing charging mode, a constant-voltage current-reducing charging mode, and a constant-current trickle charging mode. The relatively poor single cell can be relatively fully charged, and the relatively good cell can be discharged in an equalizing manner by controlling the charging time and charging current of the single cell with a relatively poor performance so as to achieve the effect that the diversity of the single cells is well reduced. The cells can be recovered to a certain degree by stopping charging for a period of time in the constant voltage charging mode, the voltage of the relatively-high-voltage single cell is reduced to a certain degree, so that the charging time can be prolonged for the relatively low voltage cell, and finally the cell is charged with trickle with the minimum charging current. This period of the charging time is prolonged so that the relatively low voltage cell keeps to be changed for a long time. In the whole charging process, the diversity of the single cells is reduced by prolonging the charging time so as to achieve the effect that the cells are relatively fully charged, and the service life of a battery pack is relatively long.
Description
Technical field
The present invention relates to a kind of method for charging batteries, particularly a kind of lithium battery group charging method.
Background technology
Current battery charging mode according to user, particularly to the charge mode of lithium battery, main employing constant current, constant voltage charge pattern is successively charged to battery, although this charging method considers the fundamental characteristics of battery, can be full of before ensure that the life cycle of lithium battery to a certain extent, more applicable to battery pack that is single or a few battery composition, but the battery pack being applied in electric automobile industry is at present all multiple cell to be combined in series, the characteristic of each cell is different, along with the use of battery, environment residing for battery cell is also different, particularly in the middle and later periods of battery life, so simple constant current, constant voltage mode charging method can cause the inconsistency of battery cell increasing, after high-tension monomer first arrives charging stopping, the battery of low-voltage does not also reach, finally just underfill state is in for whole battery pack always, the life-span of serious curtailment battery pack.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of lithium battery group charging method reducing otherness between battery cell.
For solving the problems of the technologies described above, technical scheme provided by the invention is: a kind of lithium battery group charging method, comprises four-stage:
Constant current precharge mode, with the small area analysis constant current value I set
0precharge is carried out to battery pack, when battery pack average voltage reaches set point V
0or most high monomer voltage Vmax and minimum monomer voltage Vmin difference △ V reaches settings △ V
0time, terminate pre-charge process;
Constant current equalizing charge pattern, with constant big current I
1carry out constant current charge, when most high monomer voltage Vmax reaches set point V
1time, battery management system opens balance module, carries out balanced consumed energy process in advance to the highest monomer voltage Vmax;
Constant-pressure drop current charging mode, most high monomer voltage Vmax reaches set point V
2or when total voltage reaches set point Vsumv, suspend charging setting-up time value T
0after carry out falling current charges with step-length electric current I step, when most high monomer voltage Vmax reaches set point V again
2or when total voltage reaches set point Vsumv again, again stop charging setting-up time value T
0after again carry out falling current charges with step-length electric current I step, and to circulate with this, until charging current enters next charge mode after dropping to the minimum charge current Imin of setting;
Constant current trickle charge pattern, carries out constant current charge with minimum charge current Imin to battery pack, until most high monomer voltage reaches set point V
3time, charging terminates.
Preferably, in described charging process, when cell occurs being greater than set point V
1time, battery management system controls to open balance module.
Preferably, described precharge small area analysis constant current value I
0with constant big current I
1reference battery factory set point, follow-up can along with battery capacity decay again demarcate, described precharge small area analysis constant current value I
0for battery nominal capacity 0.1C, described constant big current I
1it is 10 amperes ~ 80 amperes.
Preferably, described T
0, Istep is as the criterion with Battery Plant's set point, described T
0be 2 seconds ~ 180 seconds, Istep is 2 amperes ~ 25 amperes.
Preferably, described V
0, △ V
0, V
1, Imin, V
2, V
3, Vsumv sets according to the actual conditions of different battery, described V
0be 2.6 volts ~ 3.1 volts, described △ V
0be 0.3 volt ~ 1 volt, described V
1be 3.3 volts ~ 3.6 volts, described Imin is 2 amperes ~ 10 amperes, described V
2be 3.4 volts ~ 3.65 volts, described V
3be 3.55 volts ~ 3.75 volts, described Vsumv is 340 volts ~ 365 volts.
Compared with prior art, tool of the present invention has the following advantages:
The invention provides a kind of lithium battery group charging method, four-stage is adopted progressively to reduce the otherness of battery cell, by controlling monomer poor-performing, i.e. charging interval of the battery that monomer performance is high or minimum and charging current, lower cell can be full of, higher battery can be bled off by equilibrium, thus reach the effect well reducing cell otherness, and in constant voltage charge pattern, adopt stopping charging a period of time that battery can be made to obtain certain recovery, the magnitude of voltage of the cell of high voltage declines to some extent, the battery of low voltage is made to extend the charging interval, finally carry out trickle charge with minimum charge current, this period of charging interval lengthens, the battery of low voltage is made to continue to obtain continuous for a long time filling, by extending the charging interval in whole charging process, reduce the otherness of cell, reaching battery fills fuller, the effect that battery life is longer.
Accompanying drawing explanation
Fig. 1 is charging current curve figure of the present invention.
Embodiment
The present invention to be explained in further detail below in conjunction with accompanying drawing and embodiment for the ease of it will be appreciated by those skilled in the art that.
Embodiment
As shown in Figure 1, a kind of lithium battery group charging method, whole charging process comprises constant current precharge mode, constant current equalizing charge pattern, constant voltage by current charging mode and constant current trickle charge pattern.Carried out successively by these four kinds of charge modes, make the otherness reducing battery cell step by step.Set forth for 20V 100AH ferric phosphate lithium cell group below:
Constant current precharge mode A: after unlatching charging, reference battery factory set point, carries out small area analysis constant current value I with the nominal capacity 0.1C of battery
0=10A precharge, this small area analysis constant current value can be demarcated, when battery pack average voltage reaches set point V again along with battery capacity decay
o=2.8V or most high monomer voltage and minimum monomer voltage difference △ V(Vmax-Vmin) reach settings △ V
0during=0.5V, terminate pre-charge process, at the battery discharge end initial stage, battery with two side terminals is poor, what the battery that voltage can be made high with small area analysis constant current charge rose can not be too fast, just reduces the otherness of battery, then enter constant current equalizing charge pattern from charging.
Constant current equalizing charge Mode B: with constant big current I
1=50A carries out constant current charge, in charging process, because most high monomer voltage Vmax rises than very fast, reaches set point V at first
1during=3.45V, open the balance module of battery management system, balanced consumed energy process is carried out in advance to most high monomer voltage, reaches the object reducing battery otherness further.
Constant-pressure drop current charging mode C: when most high monomer voltage Vmax reaches set point V
2when=3.55V or total voltage reach set point Vsumv=355V, enter constant-pressure drop current charging mode, now temporarily first stop charging, reduce the active degree of inside battery molecule, Vmax voltage is declined to some extent, charging dwell time reaches T
0during=20S, reopen charging, now charging current carries out falling current processing, carries out step-length electric current I step=5A and falls current charges.Treat next time when most high monomer voltage Vmax reaches set point V
2=3.55 or total voltage when reaching set point Vsumv=355, continue to suspend charging, charging dwell time T
0=20S, then reopen charging carry out falling current charges with step-length electric current I step=5A, circulate above-mentioned charging process again, till charging current drops to set point minimum charge current Imin and battery nominal capacity 0.1C and 10A.Owing to being in higher state in this stage voltage; protection cut-ff voltage will soon be reached as re-used large current charge high-voltage battery thus cause charging to terminate; now stop charging a period of time that cell voltage can be made necessarily to be recovered, charging current carries out falling current processing also can be made to be charged to rise to set point V at every turn
2time elongated, time that the battery of lower voltage can be made so at every turn to fill lengthens.
Constant current trickle charge pattern D: continue batteries charging with minimum charge current Imin=5A constant current, until ought reach set point V by most high monomer voltage
3when=3.65, charging terminates.Trickle charge is carried out until charging setting voltage value V with minimum charge current in the final stage of charging
3time, this period of charging interval lengthens, and makes the battery of low voltage continue to obtain continuous for a long time filling.
And in whole charging process, when cell occurs being greater than set point V
1time, battery management system balance module is in opening.Whole charging process extends the charging interval, reduces the otherness of battery, reaches battery is filled fuller, extends the effect of battery life.
Be more than wherein specific implementation of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (5)
1. a lithium battery group charging method, is characterized in that, comprises four-stage:
Constant current precharge mode, with the small area analysis constant current value I set
0precharge is carried out to battery pack, when battery pack average voltage reaches set point V
0or most high monomer voltage Vmax and minimum monomer voltage Vmin difference △ V reaches settings △ V
0time, terminate pre-charge process;
Constant current equalizing charge pattern, with constant big current I
1carry out constant current charge, when most high monomer voltage Vmax reaches set point V
1time, battery management system opens balance module, carries out balanced consumed energy process in advance to the highest monomer voltage Vmax;
Constant-pressure drop current charging mode, most high monomer voltage Vmax reaches set point V
2or when total voltage reaches set point Vsumv, suspend charging setting-up time value T
0after carry out falling current charges with step-length electric current I step, when most high monomer voltage Vmax reaches set point V again
2or when total voltage reaches set point Vsumv again, again stop charging setting-up time value T
0after again carry out falling current charges with step-length electric current I step, and to circulate with this, until charging current enters next charge mode after dropping to the minimum charge current Imin of setting;
Constant current trickle charge pattern, carries out constant current charge with minimum charge current Imin to battery pack, until most high monomer voltage reaches set point V
3time, charging terminates.
2. lithium battery group charging method according to claim 1, is characterized in that: in described charging process, when cell occurs being greater than set point V
1time, battery management system controls to open balance module.
3. lithium battery group charging method according to claim 2, is characterized in that: described precharge small area analysis constant current value I
0with constant big current I
1reference battery factory set point, follow-up can along with battery capacity decay again demarcate, described precharge small area analysis constant current value I
0for battery nominal capacity 0.1C, described constant big current I
1it is 10 amperes ~ 80 amperes.
4. lithium battery group charging method according to claim 3, is characterized in that: described T
0, Istep is as the criterion with Battery Plant's set point, described T
0be 2 seconds ~ 180 seconds, Istep is 2 amperes ~ 25 amperes.
5. lithium battery group charging method according to claim 4, is characterized in that: described V
0, △ V
0, V
1, Imin, V
2, V
3, Vsumv sets according to the actual conditions of different battery, described V
0be 2.6 volts ~ 3.1 volts, described △ V
0be 0.3 volt ~ 1 volt, described V
1be 3.3 volts ~ 3.6 volts, described Imin is 2 amperes ~ 10 amperes, described V
2be 3.4 volts ~ 3.65 volts, described V
3be 3.55 volts ~ 3.75 volts, described Vsumv is 340 volts ~ 365 volts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410621731.8A CN104377396B (en) | 2014-11-07 | 2014-11-07 | A kind of lithium battery group charging method |
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|---|---|---|---|
| CN201410621731.8A CN104377396B (en) | 2014-11-07 | 2014-11-07 | A kind of lithium battery group charging method |
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| CN104377396A true CN104377396A (en) | 2015-02-25 |
| CN104377396B CN104377396B (en) | 2017-04-05 |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107054106A (en) * | 2016-07-25 | 2017-08-18 | 江苏聚合新能源科技有限公司 | A kind of charge control method of lithium ion battery bag |
| CN108293167A (en) * | 2015-11-16 | 2018-07-17 | 索诺瓦公司 | The method to charge for the battery to hearing aid and the hearing aid with battery charging unit |
| WO2018196745A1 (en) * | 2017-04-24 | 2018-11-01 | 知谷（上海）网络科技有限公司 | Charging control method and charging device |
| CN109149676A (en) * | 2017-06-27 | 2019-01-04 | 深圳市中兴微电子技术有限公司 | A kind of method and device controlling charging current |
| CN109586367A (en) * | 2018-12-03 | 2019-04-05 | 浙江大学昆山创新中心 | A kind of charging method for ferric phosphate lithium cell |
| CN110534827A (en) * | 2019-08-23 | 2019-12-03 | 江西优特汽车技术有限公司 | A kind of charging method of series-connected cell group |
| CN110829537A (en) * | 2019-11-21 | 2020-02-21 | 四川长虹电源有限责任公司 | Aviation lithium battery pack charging management system |
| CN110875621A (en) * | 2018-08-29 | 2020-03-10 | 罗伯特·博世有限公司 | Method for carrying out a combined charging and battery balancing process for an electrically driven vehicle |
| CN111063953A (en) * | 2019-12-18 | 2020-04-24 | 汉腾汽车有限公司 | Method for charging direct-current charging tail end of pure electric vehicle |
| CN111193296A (en) * | 2018-11-15 | 2020-05-22 | 杭州海康机器人技术有限公司 | Pre-charging control device and method |
| CN111244565A (en) * | 2020-01-19 | 2020-06-05 | 威海安屯尼智能电子科技有限公司 | Charging method and charger for prolonging service life of lithium ion battery and preventing accumulation of polar plates |
| CN111509320A (en) * | 2019-01-30 | 2020-08-07 | 北京小米移动软件有限公司 | Charging method and device |
| CN111740179A (en) * | 2019-12-09 | 2020-10-02 | 超威电源集团有限公司 | Charging method of storage battery |
| CN111769339A (en) * | 2019-12-09 | 2020-10-13 | 超威电源集团有限公司 | Charging method and device for prolonging cycle life of lead-acid storage battery |
| CN112072725A (en) * | 2020-07-24 | 2020-12-11 | 浙江亚特电器有限公司 | Charging control method and device suitable for charger |
| CN112117505A (en) * | 2019-06-20 | 2020-12-22 | 深圳市瑞能实业股份有限公司 | Formation and grading control method and formation and grading control system |
| CN112737032A (en) * | 2020-12-29 | 2021-04-30 | 科华恒盛股份有限公司 | Control method and control device for battery charging and terminal |
| CN112968226A (en) * | 2021-02-04 | 2021-06-15 | 河南克能新能源科技有限公司 | Capacity restoration method for laggard single-cell battery pack |
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| CN108293167A (en) * | 2015-11-16 | 2018-07-17 | 索诺瓦公司 | The method to charge for the battery to hearing aid and the hearing aid with battery charging unit |
| CN107054106A (en) * | 2016-07-25 | 2017-08-18 | 江苏聚合新能源科技有限公司 | A kind of charge control method of lithium ion battery bag |
| WO2018196745A1 (en) * | 2017-04-24 | 2018-11-01 | 知谷（上海）网络科技有限公司 | Charging control method and charging device |
| CN109149676A (en) * | 2017-06-27 | 2019-01-04 | 深圳市中兴微电子技术有限公司 | A kind of method and device controlling charging current |
| CN109149676B (en) * | 2017-06-27 | 2021-09-24 | 深圳市中兴微电子技术有限公司 | A method and device for controlling charging current |
| CN110875621A (en) * | 2018-08-29 | 2020-03-10 | 罗伯特·博世有限公司 | Method for carrying out a combined charging and battery balancing process for an electrically driven vehicle |
| CN110875621B (en) * | 2018-08-29 | 2024-10-22 | 罗伯特·博世有限公司 | Method for performing a combined charging and battery balancing process for an electrically driven vehicle |
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| CN110534827A (en) * | 2019-08-23 | 2019-12-03 | 江西优特汽车技术有限公司 | A kind of charging method of series-connected cell group |
| CN110829537A (en) * | 2019-11-21 | 2020-02-21 | 四川长虹电源有限责任公司 | Aviation lithium battery pack charging management system |
| CN111740179A (en) * | 2019-12-09 | 2020-10-02 | 超威电源集团有限公司 | Charging method of storage battery |
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| CN111244565A (en) * | 2020-01-19 | 2020-06-05 | 威海安屯尼智能电子科技有限公司 | Charging method and charger for prolonging service life of lithium ion battery and preventing accumulation of polar plates |
| CN112072725A (en) * | 2020-07-24 | 2020-12-11 | 浙江亚特电器有限公司 | Charging control method and device suitable for charger |
| CN112737032A (en) * | 2020-12-29 | 2021-04-30 | 科华恒盛股份有限公司 | Control method and control device for battery charging and terminal |
| CN112737032B (en) * | 2020-12-29 | 2023-09-29 | 科华恒盛股份有限公司 | Battery charging control method, control device and terminal |
| CN112968226A (en) * | 2021-02-04 | 2021-06-15 | 河南克能新能源科技有限公司 | Capacity restoration method for laggard single-cell battery pack |
| CN113246783B (en) * | 2021-06-07 | 2021-10-01 | 蜂巢能源科技有限公司 | Method, device, electronic device and vehicle for charging control |
| CN113246783A (en) * | 2021-06-07 | 2021-08-13 | 蜂巢能源科技有限公司 | Charging control method and device, electronic equipment and vehicle |
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