CN104333068A - Lithium battery charging control method, device and system and battery management system - Google Patents
Lithium battery charging control method, device and system and battery management system Download PDFInfo
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- CN104333068A CN104333068A CN201410610513.4A CN201410610513A CN104333068A CN 104333068 A CN104333068 A CN 104333068A CN 201410610513 A CN201410610513 A CN 201410610513A CN 104333068 A CN104333068 A CN 104333068A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 309
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 303
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000178 monomer Substances 0.000 claims description 61
- 238000004364 calculation method Methods 0.000 claims description 18
- 230000036541 health Effects 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 10
- 230000001681 protective effect Effects 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004904 shortening Methods 0.000 description 6
- 101100257262 Caenorhabditis elegans soc-1 gene Proteins 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000005562 fading Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000006399 behavior Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H02J7/0021—
-
- H02J7/0026—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
- H02J7/0049—Detection of fully charged condition
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium battery charging control method, device and system and a battery management system. The lithium battery charging control method comprises the following steps of detecting parameters of a lithium battery; calculating charging currents of the lithium battery; controlling a battery charger to charge the lithium battery according to the charging currents. The lithium battery charging control method solves the problem that, in the prior art, the service life of the lithium battery is shortened due to the fact that the lithium battery is easy to be over charged and achieves the effect that the service life of the lithium battery is improved.
Description
Technical field
The present invention relates to field of lithium, in particular to a kind of charge control method of lithium battery, device and system and battery management system.
Background technology
Lithium ion battery has that monomer operating voltage is high, volume is little, quality is light, energy density is high, service life cycle is long, self-discharge current is little, memory-less effect, pollution-free and cost performance advantages of higher, in recent years, the output of lithium ion battery is fast-developing, application constantly expands, and has become 21 century significant new high-tech product.The discharge curve of lithium ion battery is very smooth, and can produce stable power in the whole interdischarge interval of battery, therefore, lithium ion battery becomes the first-selection of Vehicular dynamic battery.But also clearly, that compares the shortcoming of lithium ion battery exactly " fragile ", has strict demand to temperature, electric current and voltage, slightly because of carelessness, just may cause battery damage, scrap, even burn, explode, cause the heavy losses of lives and properties simultaneously.
The requirement of electric automobile to lithium battery is higher, and reason is: (1) needs capacity large; (2) a large amount of connection in series-parallel uses; (3) the large and change of the operating current of battery rapidly; (4) work under bad environment, comprise road bumps and radiating condition limited etc.Due in production and use cell process.The difference of actual capacity can be caused because initial capacity, heating and self discharge etc. are incomplete same between cell, and in use more easily there is overcharge and overdischarge in the lower battery of capacity, capacity attenuation is more serious, show positive feedback, make battery with two side terminals worse and worse; In order to reach balanced effect, the capacity of equalizer, volume and quality are all large, form contradiction between this and vehicle space and high operational efficiency.
For lithium ion battery, overcharge can make the electrolyte decomposition of battery, and the gas pressure of generation increases, the temperature of battery rises rapidly.Continue charging and can cause that the barrier film of battery heat is closed, barrier film dissolves, the both positive and negative polarity open circuit of battery is generated heat in a large number, and batteries caught fire is even exploded, damage battery.
Easily causing for lithium battery in correlation technique the problem shortening lithium battery useful life because overcharging, not yet proposing effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of charge control method of lithium battery, device and system and battery management system, to solve the problem that lithium battery in prior art easily causes because overcharging shortening lithium battery useful life.
To achieve these goals, according to an aspect of the present invention, a kind of charge control method of lithium battery is provided.
Charge control method of lithium battery according to the present invention comprises: the parameter detecting lithium battery; The charging current of lithium battery according to described calculation of parameter; And control charger according to described charging current to described lithium cell charging.
Further, described lithium battery comprises n lithium battery monomer, wherein: the parameter detecting lithium battery comprises: the parameter Ci detecting described lithium battery monomer Li, and i gets 1 to n successively; According to described calculation of parameter, the charging current of lithium battery comprises: the charging current Ii calculating described lithium battery monomer Li according to described parameter Ci; Control charger to comprise described lithium cell charging according to described charging current: control described charger and charge to each described lithium battery monomer according to charging current Imin, wherein, described charging current Imin is charging current minimum in charging current I1 to charging current In.
Further, described parameter comprises electric current, voltage, temperature, state-of-charge and battery capacity, and according to described calculation of parameter, the charging current of lithium battery comprises: according to described temperature computation temperature compensation coefficient k
t; State-of-charge penalty coefficient k is calculated according to described state-of-charge
sOC; According to correction factor k
sOH1with current compensation factor k
sOH2calculate battery health coefficient k
sOH, wherein, described correction factor
q is the battery capacity of described lithium battery, Q
rfor the rated capacity of described lithium battery, described current compensation factor k
sOH2=k R
-0.5, k is the characteristic coefficient of described lithium battery, and R is the resistance of described lithium battery; And according to described temperature compensation coefficient k
t, described state-of-charge penalty coefficient k
sOC, described battery health coefficient k
sOH, described lithium battery rated capacity Q
rwith multiplying power factor k
cdetermine the described charging current of described lithium battery.
Further, according to described temperature compensation coefficient k
t, described state-of-charge penalty coefficient k
sOC, described battery health coefficient k
sOH, described lithium battery rated capacity Q
rwith multiplying power factor k
cdetermine that the charging current of described lithium battery comprises: according to formula I=k
cq
rk
tk
sOCk
sOHcalculate described charging current.
To achieve these goals, according to a further aspect in the invention, a kind of lithium cell charging control device is provided.
Lithium cell charging control device according to the present invention comprises: measuring unit, for detecting the parameter of lithium battery; Computing unit, for the charging current of lithium battery according to described calculation of parameter; And control unit, for controlling charger according to described charging current to described lithium cell charging.
Further, described lithium battery comprises n lithium battery monomer, and wherein: described measuring unit comprises measurement module, for detecting the parameter Ci of described lithium battery monomer Li, i gets 1 to n successively; Described computing unit comprises the first computing module, for calculating the charging current Ii of described lithium battery monomer Li according to described parameter Ci; Described control unit comprises control module, and charge to each described lithium battery monomer according to charging current Imin for controlling described charger, wherein, described charging current Imin is charging current minimum in charging current I1 to charging current In.
Further, described parameter comprises electric current, voltage, temperature, state-of-charge and battery capacity, and described computing unit comprises: the second computing module, for according to described temperature computation temperature compensation coefficient k
t; 3rd computing module, calculates state-of-charge penalty coefficient k according to described state-of-charge
sOC; 4th computing module, for according to correction factor k
sOH1with current compensation factor k
sOH2calculate battery health coefficient k
sOH, wherein, described correction factor
q is the battery capacity of described lithium battery, Q
rfor the rated capacity of described lithium battery, described current compensation factor k
sOH2=k R
-0.5, k is the characteristic coefficient of described lithium battery, and R is the resistance of described lithium battery; 5th computing module, for according to described temperature compensation coefficient k
t, described state-of-charge penalty coefficient k
sOC, described battery health coefficient k
sOH, described lithium battery rated capacity Q
rwith multiplying power factor k
cdetermine the described charging current of described lithium battery.
Further, described 5th computing module is according to formula I=k
cq
rk
tk
sOCk
sOHcalculate described charging current.
To achieve these goals, according to a further aspect in the invention, a kind of charging control system for lithium battery is provided.
Charging control system for lithium battery according to the present invention comprises: lithium battery; And lithium cell charging control device, the lithium cell charging control device described in any one that described lithium cell charging control device provides for foregoing.
To achieve these goals, according to a further aspect in the invention, a kind of battery management system is provided.
Charging control system for lithium battery according to the present invention comprises: lithium battery, has multiple lithium battery monomer; Lithium cell charging control device, the lithium cell charging control device described in any one that described lithium cell charging control device provides for foregoing; And balancer, for the voltage between described multiple lithium battery monomer balanced under the control of described lithium cell charging control device.
In the present invention, the parameter detecting lithium battery is adopted; According to the charging current of calculation of parameter lithium battery; And control charger according to charging current to lithium cell charging.By first going out to be applicable to the electric current to lithium cell charging according to the calculation of parameter of the lithium battery detected, and then control charger charges according to above-mentioned electric current, namely can according to the state parameter of lithium battery, timely adjustment is applicable to the electric current charged to it, avoid the behavior pattern ignoring lithium battery itself, according to fixing predetermined current, lithium battery to be charged the problem of the overcharge caused always, solving the problem that lithium battery in prior art easily causes because overcharging shortening lithium battery useful life, reaching the effect improving lithium battery useful life.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the charge control method of lithium battery according to the embodiment of the present invention;
Fig. 2 is the flow chart of charge control method of lithium battery according to the preferred embodiment of the invention;
Fig. 3 is the schematic diagram of the lithium cell charging control device according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of the battery management system according to the embodiment of the present invention; And
Fig. 5 is the schematic diagram of battery management system according to the preferred embodiment of the invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiment 1
According to the embodiment of the present invention, provide a kind of embodiment of the method that may be used for implementing the application's device embodiment, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
According to the embodiment of the present invention, provide a kind of charge control method of lithium battery, Fig. 1 is the flow chart of the charge control method of lithium battery according to the embodiment of the present invention, and as shown in Figure 1, the method comprising the steps of S102 is to step S106:
S102: the parameter detecting lithium battery, this parameter can comprise electric current, voltage, temperature and state-of-charge etc.
S104: according to the charging current of calculation of parameter lithium battery, the calculation of parameter according to detecting goes out, and when charging to lithium battery, is applicable to its electric current.
S106: control charger according to charging current to lithium cell charging.
In embodiments of the present invention, first go out to be applicable to the electric current to lithium cell charging according to the calculation of parameter of the lithium battery detected, and then control charger charges according to above-mentioned electric current, namely can according to the state parameter of lithium battery, timely adjustment is applicable to the electric current charged to it, avoid the behavior pattern ignoring lithium battery itself, according to fixing predetermined current, lithium battery to be charged the problem of the overcharge caused always, solve the problem that lithium battery in prior art easily causes because overcharging shortening lithium battery useful life, reach the effect improving lithium battery useful life.
Preferably, lithium battery comprises n lithium battery monomer, and the parameter detecting lithium battery comprises: the parameter Ci detecting lithium battery monomer Li, and i gets 1 to n successively, that is, detect the parameter of each lithium battery monomer; Charging current according to calculation of parameter lithium battery comprises: the charging current Ii calculating lithium battery monomer Li according to parameter Ci, that is, calculate the charging current of each lithium battery monomer respectively; Control charger to comprise lithium cell charging according to charging current: control charger and charge to each lithium battery monomer according to charging current Imin, wherein, charging current Imin is charging current minimum in charging current I1 to charging current In, namely, after the charging current calculating each lithium battery monomer, according to the minimum value in the charging current drawn, n lithium battery monomer is charged.
In embodiments of the present invention, according to the parameter of each lithium battery monomer, calculate the charging current that it is corresponding respectively, and then according to the minimum value in the charging current calculated, each lithium battery monomer is charged, take into account the situation of each lithium battery monomer, avoid charging current exceeds lithium battery monomer ability to bear higher than the minimum value in charging current, cause the problem that lithium battery entirety is damaged.
Particularly, the parameter of the lithium battery detected comprises electric current, voltage, temperature, state-of-charge and battery capacity, comprises step 1-1 to step 1-4 according to the charging current of calculation of parameter lithium battery:
Step 1-1: according to temperature computation temperature compensation coefficient k
t, concrete can according to following formulae discovery temperature compensation coefficient k
t:
Particularly, according to the temperature detected, go out temperature compensation system k according to the formulae discovery of correspondence
t, wherein, k
t1, k
afor temperature coefficient, can by the gain of parameter that dispatches from the factory of inquiry lithium battery.
Generally, the maximum permission charging current of temperature and battery can be divided into 3 sections: (1) temperature is at 20 DEG C ~ 45 DEG C, and this is the optimum working temperature scope of battery, and the multiplying power property of battery is good and capacity attenuation is less; (2) when temperature is lower than 20 DEG C, the internal resistance of battery is risen, and the acceptable charging current of battery reduces; (3) temperature is higher than after 45 DEG C, although the acceptable charging current of battery may be larger, the capacity attenuation of battery accelerates greatly, is therefore also not suitable for battery charging.Therefore, in order to ensure that battery can have good charging performance, regulable control can be carried out to the working temperature of battery, making it preferably be in first paragraph temperature range, also can be in second segment temperature range, but temperature when will as far as possible avoid battery to charge falls in the 3rd section of temperature range.If the working temperature of battery cannot regulate, now when knowing the working temperature of battery, just can according to the temperature compensation coefficient k of battery
tthe charging current of battery is regulated, within the scope that the charging current of battery is allowed at battery.
Step 1-2: calculate state-of-charge penalty coefficient k according to state-of-charge
sOC, concrete can according to following formulae discovery state-of-charge penalty coefficient k
sOC:
Particularly, SOC is state-of-charge, can reflect the electricity of remaining battery, goes out state-of-charge penalty coefficient k according to the dump energy detected according to corresponding formulae discovery
sOC, k
sOC1for penalty coefficient during SOC=0.Due to battery charging process charge efficiency <1, so during the SOC=100% of battery, battery may be full of not yet completely, in order to utilize the capacity of battery more fully, need to carry out boost charge to battery, simultaneously in order to prevent overcharge, the charging current of battery is restricted to 1/10 of the maximum charging current that about lithium battery allows, at this moment stops the voltage control of condition by lithium battery of charging.
Step 1-3: according to correction factor k
sOH1with current compensation factor k
sOH2calculate battery health coefficient k
sOH, wherein, correction factor
q is the battery capacity of lithium battery, Q
rfor the rated capacity of lithium battery, current compensation factor k
sOH2=k R
-0.5, k is the characteristic coefficient of lithium battery, and R is the resistance of lithium battery.
Particularly, the health status of what the SOH of battery represented is battery, mainly considers that the inducing capacity fading of battery and the internal resistance of battery increase.For inducing capacity fading, cubage correction coefficient can be adopted
revise; The charging current penalty coefficient of internal resistance to battery is k
sOH2=k R
-0.5, now according to formula
just can calculate the battery health coefficient k of lithium battery
sOH.
Step 1-4: according to temperature compensation coefficient k
t, state-of-charge penalty coefficient k
sOC, battery health coefficient k
sOH, lithium battery rated capacity Q
rwith the multiplying power factor k of lithium battery
cdetermine the charging current of lithium battery, the rated capacity Q of lithium battery
rwith the multiplying power factor k of lithium battery
ccan be learnt by the parameter of dispatching from the factory of inquiry lithium battery.
Particularly, according to formula I=k
cq
rk
tk
sOCk
sOHcalculate the charging current of lithium battery, wherein, temperature compensation coefficient k
t, state-of-charge penalty coefficient k
sOC, battery health coefficient k
sOH, lithium battery rated capacity Q
rwith multiplying power factor k
c.
When lithium battery comprises multiple lithium battery monomer, each lithium battery monomer repeated execution of steps 1-1 to step 1-4 is calculated to its charging current, then control charger and according to minimum charging current, each lithium battery monomer is charged.
Preferably, Fig. 2 is the flow chart of charge control method of lithium battery according to the preferred embodiment of the invention, and as shown in Figure 2, the method comprising the steps of S202 is to step S210:
S202: parameter initialization is arranged, and user carries out Initialize installation to the parameter of lithium battery, and the parameter of Initialize installation comprises battery, voltage, temperature.
S202: receive the parameter detected, receives the supplemental characteristic that detection module detects.
S206: judge that the parameter detected is whether in allowed band, if the numerical value of the parameter detected is all in the number range of the parameter of Initialize installation, perform step S208, if have in the number range of the parameter of the numerical steps Initialize installation of arbitrary parameter detected, perform step S210.
S208: charge according to primary current, that is, do not need the charging current changing lithium battery.
S210: send information to charger requirement and reduce charging current, the charge control method that the charging current after reduction can provide according to any embodiment in the charge control method of above-mentioned lithium battery obtains.
In embodiments of the present invention, charger can be made according to the state of battery, change output current in real time, reach the object preventing all battery cell generation overcharges and optimization charging in battery pack.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that can add required general hardware platform by software according to the method for above-described embodiment and realize, hardware can certainly be passed through, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium (as ROM/RAM, magnetic disc, CD), comprising some instructions in order to make a station terminal equipment (can be mobile phone, computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
Embodiment 2
According to the embodiment of the present invention, additionally provide a kind of lithium cell charging control device for implementing above-mentioned charge control method of lithium battery, this control device is mainly used in the control method that execution embodiment of the present invention foregoing provides, and does concrete introduction below to the lithium cell charging control device that the embodiment of the present invention provides:
According to embodiments of the invention, provide a kind of lithium cell charging control device, Fig. 3 is the schematic diagram of the lithium cell charging control device according to the embodiment of the present invention, as shown in Figure 3, this device mainly comprises measuring unit 10, computing unit 20 and control unit 30, wherein:
Measuring unit 10 is for detecting the parameter of lithium battery, and this parameter can comprise electric current, voltage, temperature and state-of-charge etc., particularly, can adopt the voltage of special chip detection lithium battery, such as: the LTC6802 that Linear company produces; Hall current sensor is adopted to detect the electric current of lithium battery; Adopt intelligent temperature sensor to detect the temperature of lithium battery, temperature sensor has the advantages such as certainty of measurement is high, change-over time fast, be convenient for measuring, the intelligent temperature sensor DS18B20 of the monobus that such as U.S. DALLAS company produces; The state-of-charge of open circuit voltage method well-known to those skilled in the art or coulomb measurement Law estimating battery can be adopted, wherein, the accuracy that open circuit voltage method is estimated the state-of-charge of lithium battery is lower, the accuracy that coulomb measurement Law is estimated the state-of-charge of lithium battery is higher, and user can select the state-of-charge method of estimation lithium battery according to its demand.
Computing unit 20 is for the charging current according to calculation of parameter lithium battery, and the calculation of parameter according to detecting goes out, and when charging to lithium battery, is applicable to its electric current.
Control unit 30 is for controlling charger according to charging current to lithium cell charging.
In embodiments of the present invention, first go out to be applicable to the electric current to lithium cell charging according to the calculation of parameter of the lithium battery detected, and then control charger charges according to above-mentioned electric current, namely can according to the state parameter of lithium battery, timely adjustment is applicable to the electric current charged to it, avoid the behavior pattern ignoring lithium battery itself, according to fixing predetermined current, lithium battery to be charged the problem of the overcharge caused always, solve the problem that lithium battery in prior art easily causes because overcharging shortening lithium battery useful life, reach the effect improving lithium battery useful life.
Preferably, lithium battery comprises n lithium battery monomer, and measuring unit 10 comprises measurement module, and for detecting the parameter Ci of lithium battery monomer Li, i gets 1 to n successively; That is, the parameter of each lithium battery monomer is detected; Computing unit 20 comprises the first computing module, for calculating the charging current Ii of lithium battery monomer Li according to parameter Ci, namely, calculate the charging current of each lithium battery monomer respectively, control unit 30 comprises control module, each lithium battery monomer is charged according to charging current Imin for controlling charger, wherein, charging current Imin is charging current minimum in charging current I1 to charging current In, namely, after the charging current calculating each lithium battery monomer, according to the minimum value in the charging current drawn, n lithium battery monomer is charged.
In embodiments of the present invention, according to the parameter of each lithium battery monomer, calculate the charging current that it is corresponding respectively, and then according to the minimum value in the charging current calculated, each lithium battery monomer is charged, take into account the situation of each lithium battery monomer, avoid charging current exceeds lithium battery monomer ability to bear higher than the minimum value in charging current, cause the problem that lithium battery entirety is damaged.
Particularly, parameter comprises electric current, voltage, temperature, state-of-charge and battery capacity, and computing unit 20 comprises the second computing module, the 3rd computing module, the 4th computing module and the 5th computing module, wherein:
Second computing module is used for according to temperature computation temperature compensation coefficient k
t, concrete can according to following formulae discovery temperature compensation coefficient k
t:
Particularly, according to the temperature detected, go out temperature compensation system k according to the formulae discovery of correspondence
t, wherein, k
t1, k
afor temperature coefficient, can by the gain of parameter that dispatches from the factory of inquiry lithium battery.
Generally, the maximum permission charging current of temperature and battery can be divided into 3 sections: (1) temperature is at 20 DEG C ~ 45 DEG C, and this is the optimum working temperature scope of battery, and the multiplying power property of battery is good and capacity attenuation is less; (2) when temperature is lower than 20 DEG C, the internal resistance of battery is risen, and the acceptable charging current of battery reduces; (3) temperature is higher than after 45 DEG C, although the acceptable charging current of battery may be larger, the capacity attenuation of battery accelerates greatly, is therefore also not suitable for battery charging.Therefore, in order to ensure that battery can have good charging performance, regulable control can be carried out to the working temperature of battery, making it preferably be in first paragraph temperature range, also can be in second segment temperature range, but temperature when will as far as possible avoid battery to charge falls in the 3rd section of temperature range.If the working temperature of battery cannot regulate, now when knowing the working temperature of battery, just can regulate according to the charging current of temperature compensation coefficient Kt to battery of battery, within the scope that the charging current of battery is allowed at battery.
3rd computing module calculates state-of-charge penalty coefficient k according to state-of-charge
sOC, concrete can according to following formulae discovery state-of-charge penalty coefficient k
sOC:
Particularly, SOC is state-of-charge, can reflect the electricity of remaining battery, goes out state-of-charge penalty coefficient k according to the dump energy detected according to corresponding formulae discovery
sOC, k
sOC1for penalty coefficient during SOC=0.Due to battery charging process charge efficiency <1, so during the SOC=100% of battery, battery may be full of not yet completely, in order to utilize the capacity of battery more fully, need to carry out boost charge to battery, simultaneously in order to prevent overcharge, the charging current of battery is restricted to 1/10 of about maximum charging current, at this moment stops the voltage control of condition by lithium battery of charging.
4th computing module is used for according to correction factor k
sOH1with current compensation factor k
sOH2calculate battery health coefficient k
sOH, wherein, correction factor
q is the battery capacity of lithium battery, Q
rfor the rated capacity of lithium battery, current compensation factor k
sOH2=k R
-1.5, k is the characteristic coefficient of lithium battery, and R is the resistance of lithium battery.
Particularly, the health status of what the SOH of battery represented is battery, mainly considers that the inducing capacity fading of battery and the internal resistance of battery increase.For inducing capacity fading, cubage correction coefficient can be adopted
revise; The charging current penalty coefficient of internal resistance to battery is k
sOH2=k R
-0.5, now according to formula
just can calculate the battery health coefficient k of lithium battery
sOH.
5th computing module is used for according to temperature compensation coefficient k
t, state-of-charge penalty coefficient k
sOC, battery health coefficient k
sOH, lithium battery rated capacity Q
rwith the multiplying power factor k of lithium battery
cdetermine the charging current of lithium battery, particularly, according to formula I=k
cq
rk
tk
sOCk
sOHcalculate the charging current of lithium battery, the rated capacity Q of lithium battery
rwith the multiplying power factor k of lithium battery
ccan be learnt by the parameter of dispatching from the factory of inquiry lithium battery.
When lithium battery comprises multiple lithium battery monomer, the second computing module to the 5th calculating is repeated for each lithium battery monomer and sees the charging current calculating it, then control charger and according to minimum charging current, each lithium battery monomer is charged.
In addition, the embodiment of the present invention additionally provides a kind of charging control system for lithium battery, and this charging control system for lithium battery comprises any one lithium cell charging control device that lithium battery and embodiment of the present invention foregoing provide.
According to the embodiment of the present invention, provide a kind of battery management system, Fig. 4 is the schematic diagram of the battery management system according to the embodiment of the present invention, as shown in Figure 4, battery management system in the embodiment of the present invention comprises lithium battery, lithium battery control device 100 and balancer 200, wherein, lithium battery comprises multiple lithium battery monomer; Any one lithium cell charging control device that lithium cell charging control device 100 provides for embodiment of the present invention foregoing, balancer 200 is for the voltage between multiple lithium battery monomer balanced under the control of lithium cell charging control device.
Particularly, after lithium cell charging control device detects parameter, voltage related data about lithium battery monomer in parameter can be passed to balancer, when the voltage that balancer is judged between any two lithium battery monomers reaches preset difference value, the voltage difference of voltage and other lithium battery monomer that lithium battery control device controls the lithium battery monomer that balancer can make voltage higher by any one scheme in resistor proposal well-known to those skilled in the art, switched-capacitor scheme or charge independence scheme is in preset difference value.
In embodiments of the present invention, by arranging balancer, improving the inconsistency of lithium battery in use voltage, reaching the effect in the life-span extending lithium battery.
Preferably, as shown in Figure 5, lithium battery management system also comprises temperature control device of vehicle 300, for regulating and controlling lithium battery temperature under the control of lithium cell charging control device 100.
It is closely related with the temperature of battery that battery performance plays quality: when temperature is too high, the energy content of battery and capacity can make full use of, but battery life can shorten; When temperature is too low, the internal resistance of battery and polarizing voltage increase, and discharge capability declines, and the actual active volume of battery is reduced, and energy utilization efficiency declines.Usually, lithium battery operating temperature range is: during charging ,-10 ~ 45 DEG C.Therefore, the temperature of lithium battery parameter to lithium battery according to detecting regulates and controls, and lithium battery is charged in optimum temperature range.After lithium cell charging control device 100 detects the parameter of lithium battery, the temperature correlation data about lithium battery monomer in parameter can be passed to temperature control device of vehicle 300, and control temperature management devices 300 regulates according to the temperature detected.Concrete regulative mode is, temperature control device of vehicle can connect outer enlarging device, and outer enlarging device can comprise radiator and heater, when detecting that the bulk temperature between lithium battery monomer is higher, can be lowered the temperature by radiator; When detecting that the bulk temperature between lithium battery monomer is lower, can be heated up by heater.
In embodiments of the present invention, by set temperature management devices, improve the inconsistency of lithium battery temperature in charging process, reach the effect in the life-span extending lithium battery.
Preferably, as shown in Figure 5, battery management system also comprises protective device 400, for controlling charger to lithium cell charging under the control of lithium cell charging control device.
Lithium battery may occur overcharging when charging or temperature crosses high abnormal state, therefore needs to take safeguard measure to it, prevents the problem that unusual condition damages battery, or other safety issues.After lithium cell charging control device 100 detects the parameter of lithium battery; can pass to protective device 400 by parameter about the temperature of lithium battery monomer, the related data of voltage and current, and control protective unit 400 controls charger and whether charges to lithium battery according to the temperature detected, voltage and current.
When the temperature detected, voltage or electric current exceed the corresponding value range of the temperature, voltage or the electric current that arrange in protective device; control module in lithium cell charging control device can send instruction to protective device, and whether the instruction that protective device can send according to control module controls charger and stop charging to lithium battery.
In embodiments of the present invention; by arranging protective device; unusual condition (as too high in temperature, electric current is excessive) that occur when lithium cell charging; charger is stoped to continue to charge to lithium battery; avoid lithium battery to damage, reach the effect that improve lithium battery fail safe.
Preferably, as shown in Figure 5, lithium battery management system also comprises communication device 500, be connected with lithium cell charging control device 100, for realizing the data interaction in communication device and battery management system between other device, SMBUS bus, CAN, RS232 bus or RS485 bus transmission of information between each device above-mentioned specifically can be adopted.
As can be seen from the above description, the invention solves the problem that lithium battery in prior art easily causes because overcharging shortening lithium battery useful life, reaching the effect improving lithium battery useful life.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed client, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a charge control method of lithium battery, is characterized in that, comprising:
Detect the parameter of lithium battery;
The charging current of lithium battery according to described calculation of parameter; And
Control charger according to described charging current to described lithium cell charging.
2. charge control method of lithium battery according to claim 1, is characterized in that, described lithium battery comprises n lithium battery monomer, wherein:
The parameter detecting lithium battery comprises: the parameter Ci detecting described lithium battery monomer Li, and i gets 1 to n successively;
According to described calculation of parameter, the charging current of lithium battery comprises: the charging current Ii calculating described lithium battery monomer Li according to described parameter Ci;
Control charger to comprise described lithium cell charging according to described charging current: control described charger and charge to each described lithium battery monomer according to charging current Imin, wherein, described charging current Imin is charging current minimum in charging current I1 to charging current In.
3. charge control method of lithium battery according to claim 1, is characterized in that, described parameter comprises electric current, voltage, temperature, state-of-charge and battery capacity, and according to described calculation of parameter, the charging current of lithium battery comprises:
According to described temperature computation temperature compensation coefficient k
t;
State-of-charge penalty coefficient k is calculated according to described state-of-charge
sOC;
According to correction factor k
sOH1with current compensation factor k
sOH2calculate battery health coefficient k
sOH, wherein, described correction factor
q is the battery capacity of described lithium battery, Q
rfor the rated capacity of described lithium battery, described current compensation factor k
sOH2=k R
-0.5, k is the characteristic coefficient of described lithium battery, and R is the resistance of described lithium battery; And
According to described temperature compensation coefficient k
t, described state-of-charge penalty coefficient k
sOC, described battery health coefficient k
sOH, described lithium battery rated capacity Q
rwith multiplying power factor k
cdetermine the described charging current of described lithium battery.
4. charge control method of lithium battery according to claim 3, is characterized in that, according to described temperature compensation coefficient k
t, described state-of-charge penalty coefficient k
sOC, described battery health coefficient k
sOH, described lithium battery rated capacity Q
rwith multiplying power factor k
cdetermine that the charging current of described lithium battery comprises: according to formula I=k
cq
rk
tk
sOCk
sOHcalculate described charging current.
5. a lithium cell charging control device, is characterized in that, comprising:
Measuring unit, for detecting the parameter of lithium battery;
Computing unit, for the charging current of lithium battery according to described calculation of parameter; And
Control unit, for controlling charger according to described charging current to described lithium cell charging.
6. lithium cell charging control device according to claim 5, is characterized in that, described lithium battery comprises n lithium battery monomer, wherein:
Described measuring unit comprises measurement module, and for detecting the parameter Ci of described lithium battery monomer Li, i gets 1 to n successively;
Described computing unit comprises the first computing module, for calculating the charging current Ii of described lithium battery monomer Li according to described parameter Ci;
Described control unit comprises control module, and charge to each described lithium battery monomer according to charging current Imin for controlling described charger, wherein, described charging current Imin is charging current minimum in charging current I1 to charging current In.
7. lithium cell charging control device according to claim 5, is characterized in that, described parameter comprises electric current, voltage, temperature, state-of-charge and battery capacity, and described computing unit comprises:
Second computing module, for according to described temperature computation temperature compensation coefficient k
t;
3rd computing module, calculates state-of-charge penalty coefficient k according to described state-of-charge
sOC;
4th computing module, for according to correction factor k
sOH1with current compensation factor k
sOH2calculate battery health coefficient k
sOH, wherein, described correction factor
q is the battery capacity of described lithium battery, Q
rfor the rated capacity of described lithium battery, described current compensation factor k
sOH2=k R
-0.5, k is the characteristic coefficient of described lithium battery, and R is the resistance of described lithium battery;
5th computing module, for according to described temperature compensation coefficient k
t, described state-of-charge penalty coefficient k
sOC, described battery health coefficient k
sOH, described lithium battery rated capacity Q
rwith multiplying power factor k
cdetermine the described charging current of described lithium battery.
8. lithium cell charging control device according to claim 7, is characterized in that,
Described 5th computing module is according to formula I=k
cq
rk
tk
sOCk
sOHcalculate described charging current.
9. a charging control system for lithium battery, is characterized in that, comprising:
Lithium battery; And
Lithium cell charging control device, the lithium cell charging control device of described lithium cell charging control device according to any one of claim 5 to 8.
10. a battery management system, is characterized in that, comprising:
Lithium battery, has multiple lithium battery monomer;
Lithium cell charging control device, the lithium cell charging control device of described lithium cell charging control device according to any one of claim 5 to 8; And
Balancer, for the voltage between described multiple lithium battery monomer balanced under the control of described lithium cell charging control device.
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