CN103094944A - Multi-section type battery module charging method and device - Google Patents
Multi-section type battery module charging method and device Download PDFInfo
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- CN103094944A CN103094944A CN201210275223XA CN201210275223A CN103094944A CN 103094944 A CN103094944 A CN 103094944A CN 201210275223X A CN201210275223X A CN 201210275223XA CN 201210275223 A CN201210275223 A CN 201210275223A CN 103094944 A CN103094944 A CN 103094944A
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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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Abstract
A multi-section battery module charging method and device, the method includes following steps a, charging the battery module with a first preset current in a first stage; b. judging whether the battery module reaches a preset voltage by a judging unit; c. if the preset voltage is judged to be reached, the battery module is charged in the second stage by using a second preset current; d. if the preset voltage is judged to be reached again, and a preset voltage difference is reached among the battery cells or one of the battery cells exceeds the preset voltage, performing third-stage charging on the battery cells with lower voltage by using a third preset current; e. and if the preset voltage is judged to be reached again, the battery module is charged at a constant voltage by using the preset voltage, and the battery module is fully charged by using the second preset current as an initial charging current. The method can prevent a state that partial electric cores are overcharged or not fully charged when the battery module is charged, namely, the voltage can be stabilized, the charging efficiency of the battery is improved, and the service life of the battery is prolonged.
Description
Technical field
The present invention relates to a kind of charging method and device of battery module, the adjustable current direction, for the lower battery core of voltage, the multisection type charging battery module method and the device that charge.
Background technology
The charging of tradition to battery module takes the state of single string battery pack or cell integrated module to carry out the multisection type charging more, and the phase I is constant-current charge, and second stage is constant-voltage charge.Be illustrated in figure 5 as a conventional batteries charged state schematic diagram.Battery phase I (t=t
0~ t
1) carry out deciding electric current (I
B) charging, curve (V
PC) represent the variation of battery module voltage.When battery module voltage reaches the voltage (V that electrical equipment provides
inc) time, enter second stage (t=t
1~ t
2) decide voltage (V
inc) charging, until battery module fills full (t=t
2) till.this way be first provide certain electric current to charging battery module a period of time to predeterminated voltage, in charging process not only temperature can increase, and because being that voltage to battery module integral body charges, and can't adjust for the charged state of each battery core wherein, but the resistance value of each battery core, initial voltage may not be identical, therefore charging reaches in the process of predeterminated voltage, might a certain battery core or the voltage of battery core group surpassed safety value (being the Voltage unbalance between each battery core or each battery core group), can cause battery module overheated and affect the problem in life-span.
For addressing the above problem, someone provides another kind of battery charging state then, as shown in Figure 6.This charging method is the variation of first measuring maximum voltage and the minimum voltage of each battery core group.Phase I (t=t
0~ t
1) be to adopt to decide electric current (I
B) charging, as battery core group maximum voltage (V
Emax) reach rated voltage (V
Coff) time, with regard to the charge closing device, when the maximum voltage of battery core group drops to lower voltage limit (V
con) time, charger restores electricity to the battery core group again, treats again to reach rated voltage (V
Coff) time, then charge closing device, switch charger so repeatedly is until each battery core full charging.Second stage (t=t
1~ t
2) in, be to decide the size of electric current according to the variation of battery core group minimum voltage, as battery core group minimum voltage (V
Emin) surpass the voltage (V that charger gives
inc) time, namely enter the size that second stage progressively downgrades charging current, and equally along with the variation of battery core group maximum voltage, power discontinuously, until battery fills full (t=t
2) till.Though the voltage between this each battery core group (or battery core) of charging method energy balance, avoid that electric current overcharges, the problem of overtension, excess Temperature, but switch charger, can lose battery life, and extend the time of whole charging battery charging, discharge continually repeatedly.
Fig. 7 provides another kind of charging modes, and it is with the first predetermined current (I
1) battery module is carried out phase I (t=t
0~ t
1) charging, in battery module, there is battery core to reach predeterminated voltage (V
1), change with one less than the first predetermined current (I
1) the second predetermined current (I
2) carry out second stage (t=t
1~ t
2) charging, there is battery core to reach predeterminated voltage (V in battery module
1), with this predeterminated voltage V
1Charge, satisfy until battery module fills.This kind mode, to utilize to adjust size of current, with the voltage control of each battery core below predeterminated voltage, although also can avoid the voltage of battery core excessive, but only observing, its per stage charging whether have battery core to surpass predeterminated voltage, can't guarantee that still every battery core all reaches predeterminated voltage, the voltage between each battery core can't balance.
And No. the I366322nd, Taiwan patent announcement provides a kind of charging device, comprises one first electric pressure converter, a second voltage transducer and a control module.The first electric pressure converter meeting output power, to the first energy storage component and the charging of the second energy storage component, second voltage transducer meeting output power is to this second energy storage component charging.When the second energy storage component charging reaches a saturated critical voltage, control module is controlled the second voltage transducer and is stopped the second energy storage component charging, the electric current of wanting to flow to the second energy storage component is feedback to the first electric pressure converter to be changed, after the first electric pressure converter conversion, again to the first energy storage component charging, to reduce the output power of supply power supply, reach energy-conservation effect.Wherein, the electric current of wanting to flow to the second energy storage component can first flow to an inductance, and this inductance begins energy storage because inverse-exciting occurs, and after the control module control switch, inductance can discharge its stored energy, and feedbacks to the first electric pressure converter and change.
Though above-mentioned charging device can avoid single energy storage component to overcharge, and can charge for the lower energy storage component of voltage, but the flow direction that can't be used for controlling unnecessary electric current because of inductance, many electric currents only can terminate in contiguous energy storage component, therefore, when charging device need to be to the charging of a plurality of energy storage components, each energy storage component electric pressure converter of need arranging in pairs or groups, with the judgement of charging, and then reach the purpose of the voltage of each energy storage component of balance.
Accordingly, this charging technique is in the application for the high power energy storage, during as electric bicycle (E-bike), electric motor car (EV) or energy storage device (ESS), can be because of up to a hundred easily of energy storage components in these devices, even thousand, force this charging device must be mutually should storage assembly number increase and use electric pressure converter, not only increase complexity and the uncertain factor of whole charging circuit, also can cause the raising of holistic cost.
Therefore, how to make each battery core in charging module or the voltage between the battery core group reach balance, and then avoid the battery module excess Temperature, improve the battery module life-span, be problem to be solved.
Summary of the invention
In view of this, the object of the invention is to, a kind of multisection type charging battery module method is provided, the method is that constant-current charge is divided into several stages, and there are different current values and charging interval in per stage, after charging reaches predetermined voltage, then carries out constant-voltage charge.Adopt the method for stage constant-current charge, can solve known once filling and reach predeterminated voltage and cause battery temperature too high within a short time, reduce the problem of battery life.
Another object of the present invention is to, a kind of multisection type charging battery module method is provided, the method is that constant-current charge is divided into phase I charging, second stage charging and phase III charging, and when the second stage charging reaches predeterminated voltage, adjust current value, carry out the phase III charging with a Weak current to not yet filling the battery core that reaches predeterminated voltage, after waiting for that predeterminated voltage reaches once again, carry out constant-voltage charge.Do not reach the method for the battery core charging of predeterminated voltage for charging, can avoid that charger constantly overcharges filling full battery core charging, causing, the problem of excess Temperature, can guarantee that each battery core all can be filled yet and reach predeterminated voltage, keep the balance of voltage between each battery core.
Another purpose of the present invention is, a kind of multisection type charging battery module device is provided, to realize aforesaid multisection type charging battery module method.
For reaching above-mentioned projects, means of the present invention are, a multisection type charging battery module method is provided, and the method comprises the following steps:
A. with one first predetermined current, battery module is carried out the phase I charging;
B. whether reach a predeterminated voltage with this battery module of a judgment unit judges;
If c. judge when this predeterminated voltage reaches, with one second predetermined current, battery module is carried out
The two-stage charging;
If judge that d. this predeterminated voltage reaches once again, and reach a default pressure reduction or its between each battery core
In a battery core when surpassing described predeterminated voltage, pre-with one the 3rd for the battery core that voltage is lower
If electric current carries out the phase III charging;
With this predeterminated voltage, this battery module is carried out when this predeterminated voltage reaches once again if e. judge
Constant-voltage charge, and with this second predetermined current as the initiation of charge electric current, to this battery
Module is filled full.
Wherein, the present invention makes the second predetermined current deduct an electric current difference for this first predetermined current, the 3rd predetermined current deducts an electric current difference for this second predetermined current, and per suitable charging interval of electric current collocation in stage, charging so step by step reaches predeterminated voltage, can improve knownly, once fills the way that reaches predeterminated voltage within a short time, when making charging battery module of the present invention, can occurrence temperature not too high and affect the problem of battery life.
Wherein, the present invention is directed to the lower battery core of voltage and carry out the means of phase III charging, that corresponding each battery core arranges a switch loop, when judgement has battery core charging to reach to reach a default pressure reduction between predeterminated voltage or each battery core, this switch loop just is switched on, and power supply stream passes through, and the lower battery core of voltage is charged, each battery core all can be charged reach predetermined voltage, do not have the situation generation that battery core overcharges.
Another means of the present invention are, a multisection type charging battery module device is provided, and this device comprises:
One battery module comprises the battery core that plural number is connected;
One charger is connected to form a charge circuit with this battery module, to provide electric current to this battery module; And
One battery management system is connected in respectively the two poles of the earth of this battery core, in order to the voltage of monitoring each battery core or the pressure reduction between each battery core, and adjusts according to this this charge circuit.
Wherein, this battery management system arranges a described switch loop corresponding to this battery core respectively, and the switch loop comprises a resistance, a switch module.This switch loop is initially not yet the state with the charge circuit conducting, when battery management system monitor each battery core between reach a default pressure reduction or when wherein a battery core surpasses a predeterminated voltage, see through this switch module of control and come actuating switch loop and charge circuit, at this moment, electric current can not flow to again and fill full battery core, and can flow to the switch loop, via this resistance consumption electric current.
Above-mentioned means can realize the purpose that the present invention " charges for the battery core that voltage is lower ", and compared to aforementioned known techniques, and with inductive energy storage, then with the charging device of most switch guide current directions, the present invention more can save cost.
Description of drawings
Fig. 1 is the flow chart of steps of multisection type charging battery module method of the present invention.
Fig. 2 is charging battery module view of the present invention.
Fig. 3 is multisection type charging battery module device circuit schematic diagram of the present invention.
Variations in temperature schematic diagram when Fig. 4 shows per stage of battery module charging.
Fig. 5 is a conventional batteries charged state schematic diagram.
Fig. 6 is another conventional batteries charged state schematic diagram.
Fig. 7 is another conventional batteries charged state schematic diagram.
[primary clustering symbol description]
S10 ~ S70 is each step of the multisection type charging battery module method of the embodiment of the present invention
I
1The first predetermined current
I
2The second predetermined current
I
3The 3rd predetermined current
V
1Predeterminated voltage
S
1Phase I, when charging, the voltage curve of battery module changed.
S
2During the second stage charging, the voltage curve of battery module changes.
S
3Phase III, when charging, the voltage curve of battery module changed.
S
4Last stage constant-current charge, the voltage curve of battery module changes.
Δ I
aThe electric current difference
Δ I
bThe electric current difference
1. battery module
11. battery core
12. battery core
2. battery management system
21. switch module
211. source electrode
212. drain
213. gate
22. switch loop
23. resistance
24. discharge control switch
25. charging control switch
3. charger
I
BDecide electric current
V
pcThe variation of battery module voltage
V
incVoltage
V
EmaxBattery core group maximum voltage
V
CoffRated voltage
V
conLower voltage limit
V
EminBattery core group minimum voltage
Embodiment
Below coordinate graphic and element numbers is done more detailed description to embodiments of the present invention, have the knack of this skill person and can implement according to this after studying this specification carefully in order to do making.
Seeing also Fig. 1 is the flow chart of steps of multisection type charging battery module method of the present invention.The method comprises the following steps: with one first predetermined current, battery module to be carried out phase I charging (step S10); Whether reach a predeterminated voltage with this battery module of a judgment unit judges, if not yet reach this predeterminated voltage, continue with this first predetermined current charging, until reach predeterminated voltage (step S20); If judge when this predeterminated voltage reaches, with one second predetermined current, battery module is carried out second stage charging (step S30); Whether reach this predeterminated voltage with this battery module of this judgment unit judges, if not yet reach this predeterminated voltage, continue with this second predetermined current charging, until reach predeterminated voltage (step S40); If judge that this predeterminated voltage reaches once again, and reach a default pressure reduction between each battery core or when wherein a battery core surpasses described predeterminated voltage, carry out phase III charging (step S50) for the battery core that voltage is lower with one the 3rd predetermined current; Whether the battery core lower with this voltage of this judgment unit judges reaches this predeterminated voltage, if this battery core not yet reaches predeterminated voltage, continues with the 3rd predetermined current charging, until this battery core reaches predeterminated voltage (step S60); If judge and with this predeterminated voltage, this battery module carried out constant-voltage charge when this predeterminated voltage reaches once again, and with this second predetermined current as the initiation of charge electric current, to this battery module fill full till (step S70).
Please coordinate that to consult Fig. 2 be charging battery module view of the present invention.Wherein transverse axis represents the time of current charges, and the longitudinal axis shows size of current and a predeterminated voltage value simultaneously.Better embodiment of the present invention is that one first predetermined current I first is provided
1To the battery module time of carrying out be t=t
0~ t
1The phase I constant-current charge, then judge with a judging unit (hold then disclose) whether battery module reaches a predeterminated voltage V
1, in figure, S
1When charging for the phase I, the voltage curve of battery module changes, and shows in figure when the time to t
1The time, the magnitude of voltage of battery module just in time reaches this predeterminated voltage V
1Predeterminated voltage V wherein
1When representing a battery core safe operation, the voltage max that can bear, for example 4.1V.Next change with one second predetermined current I
2To the battery module time of carrying out be t
1~ t
2The second stage constant-current charge, owing to considering when charging phase I, reduce battery module chargeable position, deducts an electric current difference DELTA I so the electric current that second stage provides is necessary for the first scheduled current
aAfter numerical value, with the fail safe of battery maintenance module.Then whether reach this predeterminated voltage V with this judgment unit judges battery module
1, in figure, S
2When charging for second stage, the voltage curve of battery module changes, and shows when the time in figure to arrive t
2The time, the magnitude of voltage of battery module just in time reaches this predeterminated voltage V
1Simultaneously, judging unit can be monitored and whether reached a default pressure reduction between each battery core or noly have wherein that a battery core surpasses predeterminated voltage V
1(namely judged whether full charging of battery core, but other battery core situation of full charging not yet), if reach this default pressure reduction or wherein a battery core surpass predeterminated voltage, change with one the 3rd predetermined current I
3To the lower battery core time of carrying out of voltage be t
2~ t
3The phase III constant-current charge, in like manner, the electric current that the phase III provides is necessary for the second scheduled current and deducts an electric current difference DELTA I
BNumerical value.Then whether reach this predeterminated voltage V with this judgment unit judges battery module
1, in figure, S
3When charging for the phase III, the voltage curve of battery module changes, and shows when the time in figure to reach t
3The time, the magnitude of voltage of battery module just in time reaches this predeterminated voltage V
1Whether reach this predeterminated voltage V with this judgment unit judges battery module again
1If, reach predeterminated voltage, change with this predeterminated voltage V
1And the second predetermined current I
2To the battery module time of carrying out be t
3~ t
4Constant-voltage charge, until that battery module fills is full, show S in figure
4The voltage curve in stage, be to maintain certain voltage for this reason, and along with battery module is close to full charging, the required magnitude of current reduces gradually.
Please Fig. 2 is coordinated and consult Fig. 4, more can understand the variations in temperature of battery module in each charging stage.This phase I charging is with the first predetermined current I
1At t
0~ t
1Charging is during this period of time worked as voltage and is reached predeterminated voltage V in process
1The time, its relevant temperature can rise to T
1, and make battery module that overheated crisis be arranged, therefore, the present invention will charge for the second time to this battery module, and the charging of this second stage is with far below the first predetermined current I
1The second predetermined current I
2To charging battery module, this battery module begins to charge to this predeterminated voltage V by a lower voltage
1, the second stage charging time of going through is t
1~ t
2, compared to charging interval phase I for long, the temperature of this battery module thereby from T
1Be down to T
2Then, carry out this phase III charging, the charging of this stage is with the 3rd predetermined current I
3To not yet reaching predeterminated voltage V
1Battery core charge, wherein, I
3Less than I
2And I
1And should the stage reach predeterminated voltage V by the charging voltage that opens the beginning
1, need to be t the time of going through
2~ t
3, less than the time of second stage charging, temperature is from T
2Be down to T
3What last charging stage compared to front several charging stages were different is with predeterminated voltage V
1Carry out constant-voltage charge, and with the second predetermined current I
2As initial charging current, the time that the charging of this stage is gone through is t
3~ t
4, temperature approximately maintains T
3The left and right.
Seeing also Fig. 3 is multisection type charging battery module device circuit schematic diagram of the present invention.Comprise a battery module 1, a battery management system 2 and a charger 3.This battery module 1 can as shown be the battery core 11,12 of plural number series connection, also can be the plural number battery core series connection group (not shown) of serial connection mutually; This charger 3 is connected to form a charge circuit with this battery module 1, to provide an electric current to this battery module 1; This battery management system 2 is connected in respectively the two poles of the earth of this battery core 11,12, in order to the voltage of monitoring each battery core 11,12 and the pressure reduction between each battery core 11,12, and adjusts according to this this charge circuit, makes the voltage of each battery core 11,12 can keep balance.Wherein, this battery management system 2 also comprises a switch loop 22, and in order to adjusting the loop for each battery core charging, this switch loop 22 is initially not yet the state with the charge circuit conducting; Wherein, this switch loop 22 has for the switch module 21 of controlling charge circuit, this switch module 21 is field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), be separately positioned on the position corresponding to each battery core circuit, the source electrode 211 of this switch module 21 sees through the positive pole that a resistance 23 is connected in each battery core, and 212 of drains are connected in the respectively negative pole of this battery core, and gate 213 is connected with this battery management system 2.Link between battery management system 2, charger 3 and battery module 1 discharge control switch 24 and a charging control switch 25 are arranged; this discharge control switch 24 lies in that battery core brownout, discharging current are excessive, starting protection during short circuit, and this charging control switch 25 is protected as the battery core overtension.
Please consult simultaneously Fig. 1 to Fig. 3, understand the charging method of multisection type battery module of the present invention.By charger 3 supply the first predetermined current I
1, battery module 1 is carried out phase I charging (step 10), judge with judging unit (being battery management system 2) whether battery module 1 reaches predeterminated voltage V
1If not yet reach this predeterminated voltage V
1, continue with this first predetermined current I
1Charging, until reach predeterminated voltage (step S20), if judgement arrives this predeterminated voltage V
1, charger 3 changes to supply the second predetermined current I
2Battery module 1 is carried out second stage charging (step S30), as shown in Figure 2, the second scheduled current I of second stage charging
2The first predetermined current I less than the phase I charging
1Wherein, when phase I charging and second stage charging, the I that indicates in current trend such as Fig. 3
1And I
2Direction.Judge with this judging unit (being battery management system 2) whether this battery module 1 reaches this predeterminated voltage V
1If, not yet reach this predeterminated voltage, continue with this second predetermined current I
2Charging, until reach predeterminated voltage (step S40), if judging unit (battery management system 2) judgement charging arrives predeterminated voltage V
1, judging unit (battery management system 2) can be detected simultaneously 11,12 of each battery cores and whether reaches a default pressure reduction or noly have wherein that a battery core surpasses predeterminated voltage V
1(after charging in two stages of going through as Fig. 3 battery core 11, voltage has reached predeterminated voltage, following battery core 12 is not yet filled full), at this moment, battery management system 2 can see through the gate 213 of electric signal to switch module 21 is provided, source electrode 211 and drain 212 are conducted, switch loop 22 just is communicated with charge circuit, the electric current that charger 3 disengages no longer flows to battery core 11, and can flow to switch loop 22, via resistance 23 current sinkings, then judge with this judging unit (battery management system 2) whether battery core 12 reaches this predeterminated voltage V
1If this battery core 12 not yet reaches predeterminated voltage, continue with the 3rd predetermined current I
3Charging is until this battery core 12 reaches predeterminated voltage V
1(step S60) is when every battery core 11,12 of judging unit (battery management system 2) detecting all reaches predeterminated voltage V
1The time, charger 3 can change with described predeterminated voltage V
1Carry out constant-voltage charge, until battery module 1 fills full (step S70).
Present invention be primarily characterized in that, after charger carries out several stage chargings to battery module, battery management system meeting starting switch loop, charger is charged for the battery core of minimum voltage, so that the balance of voltage between each battery core, avoid saturated battery core to overcharge, cause excess Temperature to affect battery life.Another feature is, the present invention charged to the battery module mark stage, per stage coordinates the different charging intervals to be charged to predeterminated voltage with different current values, compare known techniques, once battery is charged to the mode of predeterminated voltage with certain electric current, or the mode of switch charger repeatedly, when way of the present invention can be avoided charging battery temperature with rising, and the lifting charge efficiency, extending battery life.In addition, multisection type charging battery module method provided by the present invention can be applicable to various portable power managements and energy-storage system.
The above person is only in order to explain preferred embodiment of the present invention; be not that the attempt tool is to do any pro forma restriction to the present invention; be with, all have do relevant any modification of the present invention or change under identical invention spirit, all must be included in the category that the invention is intended to protect.
Claims (10)
1. multisection type charging battery module method, the method comprises the following steps:
A. with one first predetermined current, battery module is carried out the phase I charging;
B. whether reach a predeterminated voltage with this battery module of a judgment unit judges;
If c. judge when this predeterminated voltage reaches, with one second predetermined current, battery module is advanced
The charging of row second stage;
If judge that d. this predeterminated voltage reaches once again, and reach a default pressure reduction between each battery core
Or when wherein a battery core surpasses described predeterminated voltage, for the lower battery core of voltage with
One the 3rd predetermined current is carried out the phase III charging;
If e. judge when this predeterminated voltage reaches once again, with this predeterminated voltage to this battery module
Carry out constant-voltage charge, and with this second predetermined current as initial charging current,
Fill full to this battery module.
2. multisection type charging battery module method according to claim 1, its
In, this second predetermined current deducts an electric current difference for this first predetermined current, and the 3rd predetermined current deducts an electric current difference for this second predetermined current.
3. multisection type charging battery module method according to claim 1, wherein, when described predeterminated voltage is each battery core safe operation, a voltage max that can bear.
4. multisection type charging battery module method according to claim 1, wherein, described judging unit is a battery management system.
5. multisection type charging battery module method according to claim 4, wherein, this battery management system provides a switch loop, in steps d, when this battery core respectively reached a default pressure reduction or wherein a battery core surpasses described predeterminated voltage, this battery management system was controlled this switch of conducting loop, passes through for described the 3rd predetermined current, with the battery core lower to voltage, carry out the phase III charging.
6. multisection type charging battery module device comprises:
One battery module comprises the battery core that plural number is connected;
One charger is connected to form a charge circuit with this battery module, to provide an electric current to this battery module; And
One battery management system is connected in respectively the two poles of the earth of this battery core, in order to the voltage of monitoring each battery core and the pressure reduction between each battery core, and adjusts according to this this charge circuit.
7. multisection type charging battery module device according to claim 6, wherein, this battery management system arranges a switch loop corresponding to this battery core respectively, this switch loop is initially not yet the state with the charge circuit conducting, when monitoring, battery management system reaches a default pressure reduction between each battery core or when wherein a battery core surpasses a predeterminated voltage, control this switch loop and charge circuit conducting, power supply stream passes through, and charger is charged to the battery core of small voltage.
8. multisection type charging battery module device according to claim 7, wherein, described switch loop comprises a resistance and a switch module, this switch module is field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), described switch loop is arranged on the position corresponding to each battery core circuit.
9. multisection type charging battery module device according to claim 8, wherein, the one source pole of this switch module and drain two ends connect respectively the two poles of the earth of corresponding battery core, and a gate are connected with this battery management system.
10. multisection type charging battery module device according to claim 6, wherein, described electric current is the first predetermined current, the second predetermined current and the 3rd predetermined current, and this first predetermined current is greater than this second predetermined current, and this second predetermined current is greater than the 3rd predetermined current.
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| TW101124726 | 2012-07-10 | ||
| TW101124726A TW201403994A (en) | 2012-07-10 | 2012-07-10 | Multi-stage battery module charging method and device thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700901A (en) * | 2014-01-09 | 2014-04-02 | 上海广为美线电源电器有限公司 | Multistage intelligent charging method |
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