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CN101488591B - Method for multi-stage rechargeable battery module - Google Patents

Method for multi-stage rechargeable battery module Download PDF

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CN101488591B
CN101488591B CN2008100027583A CN200810002758A CN101488591B CN 101488591 B CN101488591 B CN 101488591B CN 2008100027583 A CN2008100027583 A CN 2008100027583A CN 200810002758 A CN200810002758 A CN 200810002758A CN 101488591 B CN101488591 B CN 101488591B
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voltage
battery module
current
charging
charge
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CN101488591A (en
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龚绍祖
陈佳昌
庄志堂
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Compal Electronics Inc
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Compal Electronics Inc
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02E60/10—Energy storage using batteries

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Abstract

一种多段式充电电池模块的方法，适用于包括多个电芯并联组的电池模块。本发明采用电压控制或电流控制的方式，在对电池模块充电之初维持定电流充电，而当电池模块中某个电芯并联组的电压达到其安全值，或是电池模块的总电压达到额定电压时，大幅度调降充电电流以降低充电速度，因此能够避免电池发生安全性的问题，并提升电池的寿命。

Figure 200810002758

A method for charging a multi-stage battery module is applicable to a battery module including a plurality of parallel groups of battery cells. The present invention adopts a voltage control or current control method to maintain a constant current charge at the beginning of charging the battery module, and when the voltage of a parallel group of battery cells in the battery module reaches its safety value, or the total voltage of the battery module reaches the rated voltage, the charging current is greatly reduced to reduce the charging speed, thereby avoiding battery safety problems and prolonging the battery life.

Figure 200810002758

Description

The method of multi-section charging cell module
Technical field
The present invention relates to a kind of charging method, and particularly relevant for a kind of charging method that adopts the multisection type charging for the intelligent battery module.
Background technology
The continuous increase of, application program more and more higher along with processor performance, drawing function are more and more advanced, the electricity needs of portable computer also increases gradually, and in order to allow battery reach the portable computer electricity needs in when running, usually when the design battery, all can adopt mode with serial connection, a plurality of electric cores and joint group are assembled in the battery module, offer the portable computer use so as to gathering enough electric power.
With respect to the raising of battery capacity, how also to be the important topic that manufacturer faced to its enforcement charging fast and safely.Because the particular design of battery module, under different time points or the different charging environment, all can produce different electric power variation, therefore, also develop the charging method that many correspondences at these characteristics of battery module.
Taiwan patent the 250713rd discloses a kind of electric power management circuit, and it is the circuit that offers the charge parameter of electric current in order to control.Fig. 1 illustrate is the calcspar of known electric power management circuit.As shown in the figure, electric power management circuit 100 comprises power control circuit 110, control signal generation circuit 120 and current control circuit 130.Wherein, power control circuit 110 is power control signals of representing DC power supply power output position standard in order to provide, control signal generation circuit 120 then is that to exceed a predetermined power thresholding position punctual when the power outputting level, reduces to offer the charge parameter of battery.In addition, 130 of current control circuits provide the current controling signal of representing DC power supply electric current outputting level, wherein on behalf of the threshold signal of threshold position standard, control signal generation circuit 120 can be further compare current controling signal and one, to exceed the threshold position punctual when the electric current outputting level, and control signal generation circuit 120 can reduce the charge parameter that offers battery further.According to as can be known above-mentioned, known technology can be at the electric power variation of battery when charging, and it is punctual to reach a threshold position at it, promptly reduces the electric power that offers battery charge.
Fig. 2 illustrate is the schematic diagram of conventional batteries charged state.Please refer to Fig. 2, this charging method can be divided into for two stages, wherein phase I (t=0～t 1) be to adopt constant-current charge, 210 of charging curves are represented battery module voltage V PCVariation.Wherein, as battery module voltage V PCReach the voltage V that charger provides IncThe time, then enter second stage (t=t 1～t 2), change into and carry out constant-voltage charge, fill full (t=t up to battery module 2) till.This practice only is that the voltage at battery module integral body charges, and can't adjust at the charged state of each electric core and joint group wherein, and, the initial voltage and the charged state of each electric core and joint group may not be identical, therefore might produce a certain electric core and joint group voltage and surpass safety value (the battery pack global voltage does not surpass safety value), but battery module still continues the situation of charging, and this measure not only can detract life-span of electric core and joint group, also exists the danger of over-charging of battery.
Fig. 3 illustrate is the schematic diagram of conventional batteries charged state.Please refer to Fig. 3, different with previous method is, this charging method is to measure the voltage of each electric core in the battery module and joint group respectively, and according to the maximum adjustment of mensuration voltage charging kenel to the entire cell module.In detail, the phase I (t=0～t of the method 1) also adopt constant-current charge, curve 310 to represent the maximum voltage V of each electric core in the battery module and joint group EmaxVariation, 320 of curves are represented the minimum voltage V of each electric core in the battery module and joint group EminVariation.Wherein as this electric core and joint group voltage V EmaxReach the rated voltage V that electric core and joint group can bear CoffThe time, then the electric power of charge closing device is supplied with, at this moment electric core and joint group voltage V EmaxWill begin to descend, up to electric core and joint group voltage V EmaxDrop to the lower voltage limit V of electric core and joint group ConThe time, recover the electric power of charger again and supply with, promote electric core and joint group voltage V EmaxVoltage, and as electric core and joint group voltage V EmaxReach rated voltage V CoffIn time, just close, and so repeats out switch and close charger till all electric cores of battery module and joint group all are full of electricity.And at second stage (t=t 1～t 2) in, then be minimum voltage V according to each electric core and joint group in the battery module EminVariation decide the size of charging current, wherein as this electric core and joint group minimum voltage V EminSurpass the voltage V that charger gives this electric core and joint group InccThe time, promptly enter the size that second stage progressively downgrades charging current, and equally along with electric core and joint group voltage V EmaxVariation, power discontinuously, fill full (t=t up to battery 2) till.Can avoid single electric core and joint group to overcharge though adopt said method, but the mode that power supply is provided discontinuously must expend the long time and the electricity of battery module can be full of, and continually battery is implemented charging, discharged and also can lose the life-span of battery, still not best charging modes.
Summary of the invention
In view of this; purpose of the present invention is exactly that a kind of method of multi-section charging cell module is being provided; change in voltage by each electric core and joint group in the mensuration battery module; and when the voltage of electric core and joint group arrives its safety value; charging current is reduced an electric current difference, reach the effect of electric core of protection and joint group.
A further object of the present invention provides a kind of method of multi-section charging cell module; change in voltage by each electric core and joint group in the mensuration battery module; in time when the voltage of electric core and joint group arrives its safety value, adjust charging voltage, reach the effect of electric core of protection and joint group.
For reaching above-mentioned or other purpose, the present invention proposes a kind of method of multi-section charging cell module, be applicable to the battery module that comprises a plurality of electric cores and joint group, the method comprises the following steps: that a. adjusts the power supply that this battery module is applied and carries out constant-current charge so that battery module is kept one first predetermined current; B. judge whether each the electric core of battery module and the voltage of joint group reach first predeterminated voltage; C. when if one of them voltage of these electric cores and joint group reaches first predeterminated voltage, the power supply that adjustment applies battery module, so that the voltage soprano keeps with one second predetermined current and carries out constant-current charge in these electric cores and the joint group, wherein this second predetermined current is that first predetermined current deducts an electric current difference; D. judge whether each the electric core of battery module and the voltage of joint group reach one second predeterminated voltage; E. when if one of them voltage of these electric cores and joint group reaches second predeterminated voltage, adjust the power supply that battery module is applied, so that the voltage soprano keeps with second predeterminated voltage and carries out constant-voltage charge in these electric cores and the joint group; Whether the electric power of f. judging battery module fills full; G. full if the electric power of battery module does not fill, then continue the highest electric core of voltage and joint group kept with second predeterminated voltage and carry out constant-voltage charge, up to the electric power of battery module fill full till.
In one embodiment of this invention, in step c, when one of them voltage of electric core and joint group reaches first predeterminated voltage, also comprise and adjust the power supply that battery module is applied earlier, so that the voltage soprano keeps with first predeterminated voltage and carries out constant-voltage charge in electric core and the joint group.Whether the electric current of judging voltage soprano in these electric cores and the joint group then reaches one the 3rd predetermined current, and when the electric current of voltage soprano in electric core and the joint group reaches the 3rd predetermined current, continue to adjust the power supply that battery module is applied again, so that the voltage soprano keeps with second predetermined current and carries out constant-current charge in electric core and the joint group.
In one embodiment of this invention, when the mode of adjusting the power supply that battery module is applied when adjusting charging current, then adjust power supply that battery module is applied among the step e. so that battery module is kept the step of carrying out constant-voltage charge with second predeterminated voltage comprises: the charging current that e1. will offer battery module reduces a position standard; E2. judge whether each the electric core of battery module and the voltage of joint group reach second predeterminated voltage; E3. when one of them voltage of these electric cores and joint group reached second predeterminated voltage, the charging current that then will offer battery module reduced a position standard again; E4. repeat above-mentioned steps e2. and e3., carry out constant-voltage charge so that battery module is kept with second predeterminated voltage.
In one embodiment of this invention, when the mode of adjusting the power supply that battery module is applied when adjusting charging voltage, then adjust power supply that battery module is applied among the step e. so that battery module is kept the step of carrying out constant-voltage charge with second predeterminated voltage comprises: the charging voltage that e1. will offer battery module reduces a position standard; E2. judge whether each the electric core of battery module and the voltage of joint group reach second predeterminated voltage; E3. when one of them voltage of these electric cores and joint group reaches second predeterminated voltage, the charging voltage that offers battery module is reduced a position standard again; E4. repeat above-mentioned steps e2. and e3., carry out constant-voltage charge so that battery module is kept with second predeterminated voltage.
The voltage max that can bear when in one embodiment of this invention, above-mentioned first predeterminated voltage and second predeterminated voltage are electric core and joint group safe operation.In another embodiment, the voltage max that first predeterminated voltage can bear when being electric core and joint group safe operation deducts voltage difference, the voltage max that second predeterminated voltage can bear when then being electric core and joint group safe operation.
The present invention proposes a kind of method of multi-section charging cell module, is applicable to battery module, and the method comprises the following steps: that a. adjusts the power supply that battery module is applied and carries out constant-current charge so that battery module is kept with one first predetermined current; Whether the voltage of b. judging battery module reaches one first predeterminated voltage; C. when if the voltage of battery module reaches first predeterminated voltage, the power supply that adjustment applies battery module, carry out constant-current charge so that battery module is kept with at least one second predetermined current, wherein this second predetermined current is that first predetermined current deducts an electric current difference; Whether the voltage of d. judging battery module reaches second predeterminated voltage; E. when if the voltage of battery module reaches second predeterminated voltage, adjust the power supply that battery module is applied, carry out constant-voltage charge so that battery module is kept with second predeterminated voltage; Whether the electric power of f. judging battery module fills full; G. full if the electric power of battery module does not fill, then continue battery module kept with second predeterminated voltage and carry out constant-voltage charge, up to the electric power of battery module fill full till.
In one embodiment of this invention, in step c, when the voltage of battery module reaches first predeterminated voltage, also comprise and adjust the power supply that battery module is applied earlier, so that keeping with first predeterminated voltage, battery module carries out constant-voltage charge, whether the electric current of judging battery module then reaches one the 3rd predetermined current, and when the electric current of battery module reaches the 3rd predetermined current, continue again to adjust the power supply that battery module is applied, carry out constant-current charge so that battery module is kept with second predetermined current.
In one embodiment of this invention, when the mode of adjusting the power supply that battery module is applied when adjusting charging current, then adjust power supply that battery module is applied among the step e. so that battery module is kept the step of carrying out constant-voltage charge with second predeterminated voltage comprises: the charging current that e1. will offer battery module reduces a position standard; Whether the voltage of e2. judging battery module reaches second predeterminated voltage; E3. when the voltage of battery module reaches second predeterminated voltage, the charging current that offers battery module is reduced a position standard again; And e4. repetition above-mentioned steps e2. and e3., so that keeping with second predeterminated voltage, battery module carries out constant-voltage charge.
In one embodiment of this invention, when the mode of adjusting the power supply that battery module is applied when adjusting charging voltage, then adjust power supply that battery module is applied among the step e. so that battery module is kept the step of carrying out constant-voltage charge with second predeterminated voltage comprises: the charging voltage that e1. will offer battery module reduces a position standard; Whether the voltage of e2. judging battery module reaches second predeterminated voltage; E3. when the voltage of battery module reaches second predeterminated voltage, the charging voltage that offers battery module is reduced a position standard again; And e4. repetition above-mentioned steps e2. and e3., so that keeping with second predeterminated voltage, battery module carries out constant-voltage charge.
In one embodiment of this invention, the voltage max that the first above-mentioned predeterminated voltage and second predeterminated voltage can bear when being the battery module safe operation, and in another embodiment, the voltage max that the first above-mentioned predeterminated voltage can bear when being the battery module safe operation deducts a voltage difference, the voltage max that second predeterminated voltage can bear when then being the battery module safe operation.
In one embodiment of this invention, whether the electric power of judging battery module fills full mode and comprises that the electric current of judging earlier by battery module whether less than a minimum current, if less than minimum current, judges that then the electric power of battery module has filled full; If greater than minimum current, judge that then the electric power of battery module does not fill full yet.
The present invention adopts the structure of voltage control or Current Control, charging battery module first kept a constant-current charge, and the voltage of certain electric core and joint group reaches its safety value in the battery module, or the total voltage of battery module is when reaching predeterminated voltage, then keep the certain voltage charging, downgrade simultaneously charging current significantly, therefore can avoid the problem of battery generation fail safe, and promote the life-span of battery.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 illustrate is the calcspar of known electric power management circuit.
Fig. 2 illustrate is the schematic diagram of conventional batteries charged state.
Fig. 3 illustrate is the schematic diagram of conventional batteries charged state.
Fig. 4 is the method flow diagram of the multi-section charging cell module that illustrates according to first embodiment of the invention.
Fig. 5 is the charge graph of the battery module that illustrates according to first embodiment of the invention.
Fig. 6 is that the adjustment charging current that illustrates according to first embodiment of the invention is to keep the method flow diagram of constant-voltage charge.
Fig. 7 is the method flow diagram of the multi-section charging cell module that illustrates according to second embodiment of the invention.
Fig. 8 is the charge graph of the battery module that illustrates according to second embodiment of the invention.
Fig. 9 is that the adjustment charging voltage that illustrates according to second embodiment of the invention is to keep the method flow diagram of constant-voltage charge.
Figure 10 is the method flow diagram of the multi-section charging cell module that illustrates according to third embodiment of the invention.
Figure 11 is the charge graph of the battery module that illustrates according to third embodiment of the invention.
Figure 12 is the method flow diagram of the multi-section charging cell module that illustrates according to fourth embodiment of the invention.
Figure 13 is the charge graph of the battery module that illustrates according to fourth embodiment of the invention.
Figure 14 is the method flow diagram of the multi-section charging cell module that illustrates according to fifth embodiment of the invention.
Figure 15 is the charge graph of the battery module that illustrates according to fifth embodiment of the invention.
Figure 16 is the method flow diagram of the multi-section charging cell module that illustrates according to sixth embodiment of the invention.
Figure 17 is the charge graph of the battery module that illustrates according to sixth embodiment of the invention.
Figure 18 is the method flow diagram of the multi-section charging cell module that illustrates according to seventh embodiment of the invention.
Figure 19 is the charge graph of the battery module that illustrates according to seventh embodiment of the invention.
Symbol description
100: electric power management circuit 110: power control circuit
120: control signal generation circuit 130: current control circuit
210: battery module voltage V PCCurve
310: electric core and joint group maximum voltage V EmaxCurve
320: electric core and joint group minimum voltage V EminCurve
510,810,830,1110,1310,1510,1710,1910: voltage curve
520,820,1120,1320,1520,1720,1920: current curve
S410～S470: each step of the method for the multi-section charging cell module of first embodiment of the invention
S451～S470: the adjustment charging current of first embodiment of the invention is with each step of the method for keeping constant-voltage charge
S710～S770: each step of the method for the multi-section charging cell module of second embodiment of the invention
S751～S770: the adjustment charging voltage of second embodiment of the invention is with each step of the method for keeping constant-voltage charge
S1010～S1090: each step of the method for the multi-section charging cell module of third embodiment of the invention
S1210～S1270: each step of the method for the multi-section charging cell module of fourth embodiment of the invention
S1410～S1470: each step of the method for the multi-section charging cell module of fifth embodiment of the invention
S1610～S1690: each step of the method for the multi-section charging cell module of sixth embodiment of the invention
S1810～S1870: each step of the method for the multi-section charging cell module of seventh embodiment of the invention
Embodiment
Generally all need to use the battery module that is cascaded by a plurality of electric cores and joint group than bigger device, can obtain sufficient electric power to operate as this class power consumption of mobile computer.Yet, owing to comprised a plurality of electric cores and joint group in this class battery module, and these electric cores and joint group are after long-term the use, its capacity or charging and discharging state all change to some extent, just can not guarantee that the state of each electric core and joint group is all identical, also is not suitable for according to initial setting its enforcement being discharged and recharged again this moment.
At this point, for the situation that battery module can not be occurred overcharging in the process of charging, now developed and a kind of intelligent battery module, its can the monitoring battery module in the magnitude of voltage of each electric core and joint group, and adjust charging current or the voltage that offers battery module according to this.The present invention adopts above-mentioned intelligent battery module, and considerations such as Bindery security and charge efficiency develop the method for a cover multi-section charging cell module that.In order to make content of the present invention more clear, below the example that can implement according to this really as the present invention especially exemplified by embodiment.
First embodiment
During near its load voltage value, significantly reduce in its chargeable position (electric hole) at the magnitude of voltage of battery module, and then may to the fail safe of battery module impact if still with high electric current it is continued charging this moment.In view of the above, one embodiment of the invention promptly are when one of them voltage of the electric core of battery module and joint group reaches the voltage max that its safe operation can bear, the charging current that offers electric core and joint group is reduced an amplitude, with the fail safe of battery maintenance module.
Fig. 4 is the method flow diagram of the multi-section charging cell module that illustrates according to first embodiment of the invention.Please refer to Fig. 4, present embodiment is by the mode of control charging current, a battery module with a plurality of electric cores and joint group is charged, wherein, for example be parallel with one or more electric cores (cell) in above-mentioned each electric core and the joint group, to store sufficient electric power.
Fig. 5 is the charge graph of the battery module that illustrates according to first embodiment of the invention.Please be simultaneously with reference to Fig. 4 and Fig. 5, present embodiment is at first stage (t=0～t of charging 1), be to adjust earlier the charging current that imposes on battery module so that electric core and joint group are kept with the first predetermined current I 1Carry out constant-current charge (step S410).The so-called herein first predetermined current I 1For example be a fixing electric current that provides by a charger (charger), and the voltage of charger is also fixed usually.The voltage of electric core of each of battery module and joint group promptly can be along with the increase of the electric current that is received, and produces the voltage curve 510 that changes along with the time as shown in Figure 5 gradually, and voltage curve 510 herein is to represent to have maximum voltage V in the battery module EmaxElectric core and the voltage curve of joint group.
Whether the voltage that then then can judge each electric core in this battery module and joint group reaches the first predeterminated voltage V 1(step S420).This first predeterminated voltage V 1The voltage max that can bear when representing an electric core and joint group safe operation (load voltage value of electric core and joint group), and limit in order to the voltage to single electric core and joint group.Present embodiment with the voltage limit of electric core and joint group at this first predeterminated voltage V 1Scope in, with under the situation of the fail safe of guaranteeing each electric core and joint group, this battery module is charged.
Get back to step S420, if there is the voltage of any one electric core and joint group to reach the aforesaid first predeterminated voltage V 1The time, then the representative charging voltage that imposes on electric core and joint group has reached the higher limit that some electric cores and joint group can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of electric core and joint group 1～t 2), with the first predetermined current I of script constant-current charge 1Size downgrades, and the voltage soprano keeps with the second predetermined current I in electric core and the joint group and make 2Carry out constant-current charge (step S430), wherein this second predetermined current I 2Be the first predetermined current I 1Deduct electric current difference DELTA I (current curve 520 as shown in Figure 5), the size of this electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, and do not limit its scope, that is to say, to the second predetermined current I 2When carrying out constant-current charge, be not once just to adjust to the right place, but utilize electric current difference DELTA I (the first predetermined current I 120%～50%) multistage mode adjusts one or more second predetermined current.
Wherein, in order to allow the unlikely rated voltage that surpasses of magnitude of voltage of each electric core in the battery module and joint group.Present embodiment then is to adopt to adjust the mode of the charging current that battery module is applied, and allows electric core and joint group with maximum voltage maintain a constant-current charge.
It should be noted that at electric core and joint group and keep with at least one second predetermined current I 2When carrying out constant-current charge, present embodiment judges further then whether the voltage of this electric core and joint group reaches the first predeterminated voltage value V once again 1(step S440).As previously mentioned, this first predeterminated voltage value V 1The voltage max that can bear during for electric core and joint group safe operation, and reach the first predeterminated voltage value V once again when the voltage of electric core and joint group 1The time, promptly to represent the electric power of electric core and joint group to be close to fill full, this moment, present embodiment promptly entered the phase III (t=t of charging 2～t 3), and adjust the charging current that electric core and joint group are applied, so that the voltage soprano keeps with this first predeterminated voltage V in electric core and the joint group 1Carry out constant-voltage charge (step S450).
At last, then be whether the electric power of judging battery module is full of (step S460) fully.Wherein, whether the electric power of judging battery module fills full mode comprises that whether the electric current of judging by battery module is less than a minimum current value, if less than minimum current, then represent the electric power of battery module to level off to saturated, therefore giving under the identical voltage condition, required current value is more and more little.The electric power that can judge battery module this moment has filled full, and stops battery module charge (step S470); Otherwise, full if the electric current by battery module, can judge then that the electric power of battery module does not fill yet still greater than minimum current, and return step S450, continue electric core and joint group are carried out constant-voltage charge, up to the electric power of battery module fill full till.
In addition, how in step S450, adjust charging current so that electric core and joint group are maintained constant-voltage charge, with next in addition for an embodiment explanation.Fig. 6 is that the adjustment charging current that illustrates according to first embodiment of the invention is to keep the method flow diagram of constant-voltage charge.Please refer to Fig. 6, present embodiment is to continue after above-mentioned steps S450, and according to the rated voltage that electric core and joint group can bear, adjusts charging current and decide to charge voltage under to allow electric core and joint group maintain.
In the present embodiment, initial situation is that the voltage of existing some electric cores and joint group reaches rated voltage, and in order not allow the voltage of this electric core and joint group itself surpass this rated voltage, present embodiment is that the charging current that will offer battery module earlier reduces a position standard (step S451).This standard is by the manufacturer of each tame charger or reaching situation according to the actual requirements by the user is defined, and the present invention does not limit its scope.In addition, after reducing charging current, charging voltage still remains unchanged, but the voltage of battery module itself then can be along with the charging current that is received reduces and decline a little, and this decline scope also can be subjected to charging current and reduces what influence certainly.And present embodiment is in order to allow charging voltage maintain necessarily as far as possible, and the accurate amplitude in the position that charging current reduced is also not too large, and allows the curve of the charging voltage among Fig. 5 keep level.
After reducing the position standard of charging voltage, the voltage potential of electric core and joint group must descend a bit, so the next step of present embodiment promptly is to continue to judge whether the voltage of each electric core in the battery module and joint group reaches rated voltage (step S452) again.In case when reaching rated voltage again, again charging current is reduced a position standard (step S453).Last then judge whether the electric power of battery module fills full (step S460), if filled fullly, then stop charging battery module (step S470); Otherwise, if do not fill fullly as yet, then repeat the above-mentioned step of falling low level, judging voltage, up to the electric power of battery module fill full till.
Mode by above-mentioned control charging current, adopt constant-current charge at the charging initial stage, and when the voltage of certain electric core and joint group reaches rated voltage, significantly reduce charging current value, when the voltage for the treatment of this electric core and joint group reaches rated voltage once again, just change constant-voltage charge into, compared to known technology, the present invention can avoid the problem of battery module generation fail safe, and promotes the life-span of battery module.
What deserves to be mentioned is, adjust the charging current that imposes on battery module in the present embodiment and comprise also before that elder generation carries out a trickle charge (trickle charge) to battery module so that electric core and joint group are kept the step of a constant-current charge, and whether the voltage of judging battery module reaches a charging start voltage, and when the voltage of battery module reaches the charging start voltage, begin battery module is carried out constant-current charge.When adopting the reason of this step to be with big electric current the battery of over-discharge can or deep discharge to be advanced to charge, be difficult for making the capacity of battery fully to recover, therefore when the electric power of battery was extremely low, the essential mode of this trickle charge that adopts was with the protection battery.
Second embodiment
Except above-mentioned " Control current " with the mode to charging battery module, the present invention also comprises the mode of utilization " control voltage ", and battery module is charged, and illustrates in detail for an embodiment with next.
Fig. 7 is the method flow diagram of the multi-section charging cell module that illustrates according to second embodiment of the invention.Please refer to Fig. 7, present embodiment is the mode by control " charging voltage ", battery module with a plurality of electric cores and joint group is charged, and when the electric core of battery module and joint group one voltage wherein reaches the voltage max that its safe operation can bear, the charging current that offers battery module is reduced an amplitude, with the fail safe of battery maintenance.
Fig. 8 is the charge graph of the battery module that illustrates according to second embodiment of the invention.Please be simultaneously with reference to Fig. 7 and Fig. 8, described as first embodiment, the charging modes of present embodiment also comprises three phases, wherein, first stage (t=0～t 1) be to adjust earlier the charging voltage that imposes on battery module so that electric core of each in the battery module and joint group are kept with the first predetermined current I 1Carry out constant-current charge (step S710).Wherein, charging voltage is herein provided by charger, and charging current is also fixed.The voltage of electricity core and joint group still can be along with the increase of the electric current that is received, and produces the curve 810 that changes along with the time as shown in Figure 8 gradually.
Whether the voltage that then then can judge each electric core in this battery module and joint group reaches the first predeterminated voltage V 1(step S720).Wherein, if there is the voltage of any one electric core and joint group to reach the aforesaid first predeterminated voltage V 1The time, then the representative charging voltage that imposes on electric core and joint group has reached the higher limit that some electric cores and joint group can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of electric core and joint group 1～t 2), and the first predetermined current I of constant-current charge originally 1Size downgrades, and the voltage soprano keeps with at least one second predetermined current I in electric core and the joint group and make 2Carry out constant-current charge (step S730), wherein this second predetermined current I 2Be the first predetermined current I 1Deduct electric current difference DELTA I, the size of electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, also do not limit its scope, that is to say, to the second predetermined current I 2When carrying out constant-current charge, be not once just to adjust to the right place, but utilize the multistage mode of electric current difference DELTA I to adjust one or more second predetermined current.
Wherein, in order to allow the unlikely rated voltage that surpasses of magnitude of voltage of each electric core in the battery module and joint group itself.Present embodiment then is to adopt to adjust the mode of the charging voltage that battery module is applied, and allows electric core and joint group with maximum voltage maintain a constant-current charge.
Similarly, keep with at least one second predetermined current I at electric core and joint group 2When carrying out constant-current charge, present embodiment also comprises further judges whether the electric core of battery module and the voltage of joint group reach the first predeterminated voltage value V once again 1(step S740), and reach the first predeterminated voltage value V once again when the voltage of electric core and joint group 1The time, promptly enter the phase III (t=t of charging 2～t 3), and adjust the charging voltage that battery module is applied, so that the voltage soprano keeps with this first predeterminated voltage V in electric core and the joint group 1Carry out constant-voltage charge (step S750).
At last, then be whether the electric power of judging battery module is full of (step S760) fully.Wherein, if the electric current by battery module is more and more little, up to less than minimum current the time, the electric power that can judge battery module has filled full, and stops battery module charge (step S770); Otherwise, full if the electric current by battery module, can judge then that the electric power of battery module does not fill yet still greater than minimum current, and return step S750, continue battery module is carried out constant-voltage charge, up to the electric power of battery module fill full till.
From as can be known above-mentioned, present embodiment is to adopt the mode of adjusting " adjustment charging voltage " to control charging current and the voltage that offers battery module with different being in present embodiment of the first embodiment maximum.And how to adjust charging voltage battery module is maintained constant-voltage charge, with next in addition for an embodiment explanation.
Please refer to Fig. 9, present embodiment is to continue after above-mentioned steps S750, and according to the rated voltage that electric core and joint group can bear, adjusts charging voltage and decide to charge voltage under to allow electric core and joint group maintain.
In the present embodiment, initial situation is that the voltage of electric core and joint group reaches rated voltage once again, and in order not allow the voltage of this electric core and joint group itself surpass this rated voltage, present embodiment is that the charging voltage that will offer battery module earlier reduces a position standard (step S751).And after reducing charging voltage, charging current still remains unchanged, but the voltage of electric core and joint group itself then can be along with the charging voltage that is received reduces and decline a little, and this decline scope also can be subjected to charging voltage and reduces what influence certainly.And present embodiment is in order to allow the voltage of electric core and joint group itself maintain necessarily as far as possible, and the accurate amplitude in the position that charging voltage reduced is also not too large, and allows the curve 830 of the charging voltage among Fig. 8 keep level.
After reducing the position standard of charging voltage, the voltage potential of electric core and joint group must descend a bit, so the next step of present embodiment promptly is to continue to judge whether the voltage of each electric core in the battery module and joint group reaches rated voltage (step S752) again.In case when reaching rated voltage again, again charging voltage is reduced a position standard (step S753).Last then judge whether the electric power of battery module fills full (step S760), if filled fullly, then stop charging battery module (step S770); Otherwise, if do not fill fullly as yet, then repeat above-mentioned reduction charging voltage position standard, judge the step of electric core and joint group voltage, up to the electric power of battery module fill full till.
Mode by above-mentioned control charging voltage, adopt constant-current charge at the charging initial stage, and when the voltage of certain electric core and joint group reaches rated voltage, significantly reduce charging current value, when the voltage for the treatment of this electric core and joint group reaches rated voltage once again, just change constant-voltage charge into, compared to known technology, the present invention can avoid the problem of battery generation fail safe, and promotes the life-span of battery.
The 3rd embodiment
Preceding two embodiment all are when the voltage of electric core and joint group reaches rated voltage, promptly significantly reduce charging current value to guarantee the fail safe of battery module.Compared to this, present embodiment then is that this time point that " significantly reduces charging current value " is moved backward, meaning is promptly when the voltage of electric core and joint group reaches rated voltage, adopt earlier and carry out constant-voltage charge with rated voltage, when current value to be charged drops to certain lower charging current value gradually, just charging current is significantly downgraded, to accelerate the charging rate of battery module.
Figure 10 is the method flow diagram of the multi-section charging cell module that illustrates according to third embodiment of the invention.Figure 11 is the charge graph of the battery module that illustrates according to third embodiment of the invention.Please be simultaneously with reference to Figure 10 and Figure 11, present embodiment is by the mode of control charging current, and a battery module with a plurality of electric cores and joint group is charged.Different with previous first embodiment is, present embodiment comprises four charging stages, wherein, and first stage (t=0～t 1) be to adjust earlier the charging current that imposes on battery module so that electric core of each in the battery module and joint group are kept with the first predetermined current I 1Carry out constant-current charge (step S1010).The voltage of electric core of each of battery module and joint group itself promptly can be along with the increase of the electric current that is received, and produces the voltage curve 1110 that changes along with the time as shown in figure 11 gradually, and voltage curve 1110 herein is to represent to have maximum voltage V in the battery module EmaxElectric core and the voltage curve of joint group.
Whether the voltage that then then can judge each electric core in this battery module and joint group reaches the first predeterminated voltage V 1(step S1020).Wherein, if there is the voltage of any one electric core and joint group to reach the aforesaid first predeterminated voltage V 1The time, then the representative charging voltage that imposes on electric core and joint group has reached the higher limit that some electric cores and joint group can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of electric core and joint group 1～t 2), gradually with the big or small I of first predetermined current of constant-current charge originally 1Downgrade, the voltage soprano keeps with the first predeterminated voltage V in electric core and the joint group and make 1Carry out constant-voltage charge (step S1030).
In the process of carrying out constant-voltage charge, because that the electric power of battery module fills gradually is full, the charging current of therefore supplying with battery module also can descend gradually.At this moment, in order to ensure the fail safe of electric core and joint group, present embodiment can judge promptly whether the charging current of supplying with this electric core and joint group drops to the second predetermined current I 2(step S1040).When the charging current of electric core and joint group drops to the second predetermined current I 2The time, present embodiment promptly enters the phase III (t=t of charging 2～t 3), the voltage soprano keeps with the first predeterminated voltage V in electric core and the joint group and script made 1The mode of carrying out constant-voltage charge changes into the 3rd predetermined current I 3Carry out constant-current charge (step S1050).Be similar to the described second predetermined current I of first embodiment 2, the 3rd predetermined current I of present embodiment 3Be the first predetermined current I 1Deduct electric current difference DELTA I, the size of this electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, and do not limit its scope.
It should be noted that at electric core and joint group and keep with the 3rd predetermined current I 3When carrying out constant-current charge, present embodiment judges further then whether the electric core of battery module and the voltage of joint group reach the first predeterminated voltage value (step S1060) once again.When the voltage of electric core and joint group reaches the first predeterminated voltage value V once again 1The time, promptly to represent the electric power of electric core and joint group to be close to fill full, this moment, present embodiment promptly entered the quadravalence section (t=t of charging 3～t 4), adjust the charging current that battery module is applied, so that the voltage soprano keeps once again with this first predeterminated voltage V in electric core and the joint group 1Carry out constant-voltage charge (step S1070).
At last, then be whether the electric power of judging battery module is full of (step S1080) fully.Wherein, whether the electric power of judging battery module fills full mode comprises that whether the electric current of judging by battery module is less than a minimum current value, if less than minimum current, then represent the electric power of battery module to level off to saturated, therefore giving under the identical voltage condition, required current value is more and more little.The electric power that can judge battery module this moment has filled full, and stops battery module charge (step S1090); Otherwise, full if the electric current by battery module, can judge then that the electric power of battery module does not fill yet still greater than minimum current, and return step S1070, continue electric core and joint group are carried out constant-voltage charge, up to the electric power of battery module fill full till.
By the charging method of present embodiment, carry out the action of " significantly downgrading charging current " than first, second embodiment is late, therefore, can give each the electric core of battery module and joint group sufficient electric power, and early the electric power of battery module is full of.
The 4th embodiment
Comparing the 3rd embodiment is that the time point that will " significantly reduce charging current value " is moved backward; present embodiment then is that the time point of this " reduction charging current value " is moved forward; just; to reduce in order to judge the rated voltage that will reduce charging current value; and early charging current is downgraded, with the fail safe of protection battery.
Figure 12 is the method flow diagram of the multi-section charging cell module that illustrates according to fourth embodiment of the invention, and Figure 13 is the charge graph of the battery module that illustrates according to fourth embodiment of the invention.Please be simultaneously with reference to Figure 12 and Figure 13, present embodiment is by the mode of control charging current, and a battery module with a plurality of electric cores and joint group is charged.Present embodiment comprises three charging stages, wherein, and first stage (t=0～t 1) same adjust the charging current that imposes on battery module earlier so that electric core of each of battery module and joint group are kept with the first predetermined current I 1Carry out constant-current charge (step S1210).The voltage of electric core of each of battery module and joint group itself promptly can be along with the increase of the electric current that is received, and produces the voltage curve 1310 that changes along with the time as shown in figure 13 gradually, and voltage curve 1310 herein is to represent to have maximum voltage V in the battery module EmaxElectric core and the voltage curve of joint group.
Whether the voltage that then then can judge each electric core in this battery module and joint group reaches the first predeterminated voltage V 1(step S1220).It should be noted that present embodiment and the 3rd embodiment difference are: this first predeterminated voltage V 1Be that (load voltage value of electric core and joint group is as the voltage V among Figure 13 for a voltage max that can bear when being set at electric core and joint group safe operation 2) deduct a voltage difference Δ V, and one step of morning downgrades charging current, with the fail safe of protection battery.
Get back to step S420, if there is the voltage of any one electric core and joint group to reach the aforesaid first predeterminated voltage V 1The time, then the representative charging voltage that imposes on battery module has reached the higher limit that some electric cores and joint group can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of electric core and joint group 1～t 2), and the first predetermined current I of constant-current charge originally 1Size downgrades, and the voltage soprano keeps with the second predetermined current I in electric core and the joint group and make 2Carry out constant-current charge (step S430), wherein this second predetermined current I 2Be the first predetermined current I 1Deduct electric current difference DELTA I, the size of this electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, and do not limit its scope.
It should be noted that at electric core and joint group and keep with the second predetermined current I 2When carrying out constant-current charge, present embodiment judges further then whether the electric core of battery module and the voltage of joint group reach the second predeterminated voltage value V 2(step S1240).This second predeterminated voltage value V 2A voltage max that can bear when being electric core and joint group safe operation (load voltage value of electric core and joint group), and reach this second predeterminated voltage value V when the voltage of electric core and joint group 2The time, promptly to represent the electric power of electric core and joint group to be close to fill full, this moment, present embodiment promptly entered the phase III (t=t of charging 2～t 3), and adjust the charging current that battery module is applied, so that the voltage soprano keeps with this second predeterminated voltage V in electric core and the joint group 2Carry out constant-voltage charge (step S1250).
At last, then be whether the electric power of judging battery module is full of (step S1260) fully.Wherein, whether the electric power of judging battery module fills full mode comprises that whether the electric current of judging by battery module is less than a minimum current value, if less than minimum current, then represent the electric power of battery module to level off to saturated, therefore giving under the identical voltage condition, required current value is more and more little.The electric power that can judge battery module this moment has filled full, and stops battery module charge (step S1270); Otherwise, full if the electric current by battery module, can judge then that the electric power of battery module does not fill yet still greater than minimum current, and return step S1250, continue electric core and joint group are carried out constant-voltage charge, up to the electric power of battery module fill full till.
Charging method by present embodiment; early a step is carried out the action of " significantly downgrading charging current " than first, second embodiment; therefore; can protect each electric core of battery module and joint group is unlikely reduces its life-span because of overcharging; the fail safe of protection battery module; above embodiment one～four all can select utilization according to actual needs by the user, and the present invention does not limit its scope.
The 5th embodiment
Previous four embodiment are all to be as the Rule of judgment that whether significantly reduces charging current with " voltage of electric core and joint group ", yet this way that " significantly reduces charging current " also is applicable to " voltage of the battery module integral body " situation as Rule of judgment.Present embodiment is and first embodiment mapping mutually when arriving its rated voltage by the voltage at battery module, promptly significantly to reduce charging current, with the fail safe of protection battery.
Figure 14 is the method flow diagram of the multi-section charging cell module that illustrates according to fifth embodiment of the invention, and Figure 15 is the charge graph of the battery module that illustrates according to fifth embodiment of the invention.Please be simultaneously with reference to Figure 14 and Figure 15, present embodiment is by the mode of control charging current, and a battery module is charged.The charging method of present embodiment comprises three phases, first stage (t=0～t 1) be to adjust earlier the charging current that imposes on battery module so that battery module is kept with the first predetermined current I 1Carry out constant-current charge (step S1410).The voltage of battery module integral body promptly can be along with the increase of the electric current that is received, and produces the voltage curve 1510 that changes along with the time as shown in figure 15 gradually.
Can judge then then whether the voltage of this battery module reaches the first predeterminated voltage V 1(step S1420).This first predeterminated voltage V 1The voltage max that can bear when representing the battery module safe operation (load voltage value of battery module).Present embodiment with the voltage limit of battery module at this first predeterminated voltage V 1Scope in, with under the situation of the fail safe of guaranteeing battery module, this battery module is charged.
Get back to step S1420, if the voltage of battery module reaches the aforesaid first predeterminated voltage V 1The time, then represent the charging voltage that imposes on battery module to reach the higher limit that battery module can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of battery module 1～t 2), and the first predetermined current I of constant-current charge originally 1Downgrade, and battery module is kept with the second predetermined current I 2Carry out constant-current charge (step S1430), wherein this second predetermined current I 2Be the first predetermined current I 1Deduct electric current difference DELTA I (current curve 1520 as shown in figure 15), the size of this electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, and do not limit its scope.
It should be noted that at battery module and keep with the second predetermined current I 2When carrying out constant-current charge, present embodiment judges further then whether the voltage of battery module reaches the first predeterminated voltage value V once again 1(step S1440).As previously mentioned, this first predeterminated voltage value V 1The voltage max that can bear during for the battery module safe operation, and reach the first predeterminated voltage value V once again when the voltage of battery module 1The time, promptly to represent the electric power of battery module to be close to fill full, this moment, present embodiment promptly entered the phase III (t=t of charging 2～t 3), adjust the charging current that battery module is applied, so that battery module is kept with this first predeterminated voltage V 1Carry out constant-voltage charge (step S1450).
At last, then be whether the electric power of judging battery module is full of (step S1460) fully.When the electric power of battery module has filled when full, then can stop battery module charge (step S1470); Otherwise, when the electric power of battery module does not fill when full yet, then return step S1450, continue battery module is carried out constant-voltage charge, up to the electric power of battery module fill full till.
The 6th embodiment
Compared to previous the 5th embodiment is when the voltage of battery module reaches rated voltage, promptly significantly reduce charging current value to guarantee the fail safe of battery, present embodiment then is that this time point that " significantly reduces charging current value " is moved backward, meaning is promptly when the voltage of battery module reaches rated voltage, adopt earlier and carry out constant-voltage charge with rated voltage, when current value to be charged drops to certain lower charging current value gradually, just charging current is significantly downgraded, to accelerate the charging rate of battery module.
Figure 16 is the method flow diagram of the multi-section charging cell module that illustrates according to sixth embodiment of the invention, and Figure 17 is the charge graph of the battery module that illustrates according to sixth embodiment of the invention.Please be simultaneously with reference to Figure 16 and Figure 17, present embodiment is by the mode of control charging current, and a battery module is charged.Different with previous the 5th embodiment is, present embodiment comprises four charging stages, wherein, and first stage (t=0～t 1) be to adjust earlier the charging current that imposes on battery module so that battery module is kept with the first predetermined current I 1Carry out constant-current charge (step S1610).The voltage of battery module itself promptly can be along with the increase of the electric current that is received, and produces the voltage curve 1710 that changes along with the time as shown in figure 17 gradually.
Can judge then then whether the voltage of this battery module reaches the first predeterminated voltage V 1(step S1720).Wherein, in case the voltage of battery module reaches the aforesaid first predeterminated voltage V 1The time, then represent the charging voltage that imposes on battery module to reach the higher limit that battery module can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of battery module 1～t 2), incite somebody to action the first predetermined current I of constant-current charge originally gradually 1Downgrade, and battery module is kept with the first predeterminated voltage V 1Carry out constant-voltage charge (step S1630).
In the process of carrying out constant-voltage charge, because that the electric power of battery module fills gradually is full, the charging current of therefore supplying with battery module also can descend gradually.At this moment, in order to ensure the fail safe of battery module, present embodiment can judge promptly whether the charging current of supplying with battery module drops to the second predetermined current I 2(step S1640).When the charging current of battery module drops to the second predetermined current I 2The time, present embodiment promptly enters the phase III (t=t of charging 2～t 3), and battery module is kept with the first predeterminated voltage V script 1The mode of carrying out constant-voltage charge changes into the 3rd predetermined current I 3Carry out constant-current charge (step S1650).Be similar to the described second predetermined current I of the 5th embodiment 2, the 3rd predetermined current I of present embodiment 3Be the first predetermined current I 1Deduct electric current difference DELTA I, the size of this electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, and do not limit its scope.
It should be noted that at battery module and keep with the 3rd predetermined current I 3When carrying out constant-current charge, present embodiment judges further then whether the voltage of battery module reaches the first predeterminated voltage value V once again 1(step S1660).As previously mentioned, this first predeterminated voltage value V 1The voltage max that can bear during for the battery module safe operation, and reach the first predeterminated voltage value V once again when the voltage of battery module 1The time, promptly to represent the electric power of battery module to be close to fill full, this moment, present embodiment promptly entered the quadravalence section (t=t of charging 3～t 4), adjust the charging current that battery module is applied, so that battery module is kept once again with this first predeterminated voltage V 1Carry out constant-voltage charge (step S1670).
At last, then be whether the electric power of judging battery module is full of (step S1680) fully.When the electric power of battery module has filled when full, then can stop battery module charge (step S1690); Otherwise, when the electric power of battery module does not fill when full yet, then return step S1670, continue battery module is carried out constant-voltage charge, up to the electric power of battery module fill full till.
The 7th embodiment
Comparing the 6th embodiment is that the time point that will " significantly reduce charging current value " is moved backward; present embodiment then is that the time point of this " reduction charging current value " is moved forward; meaning is about in order to judge that the rated voltage that will reduce charging current value reduces; and early charging current is downgraded, with the fail safe of protection battery.
Figure 18 is the method flow diagram of the multi-section charging cell module that illustrates according to seventh embodiment of the invention.Figure 19 is the charge graph of the battery module that illustrates according to seventh embodiment of the invention.Please be simultaneously with reference to Figure 18 and Figure 19, present embodiment is by the mode of control charging current, and a battery module is charged.Present embodiment comprises three charging stages, wherein, and first stage (t=0～t 1) same adjust the charging current that imposes on battery module earlier so that battery module is kept with the first predetermined current I 1Carry out constant-current charge (step S1210).The voltage of battery module itself promptly can be along with the increase of the electric current that is received, and produces the voltage curve 1910 that changes along with the time as shown in figure 19 gradually.
Can judge then then whether the voltage of this battery module reaches the first predeterminated voltage V 1(step S1220).It should be noted that present embodiment and the 6th embodiment difference are: this first predeterminated voltage is V 1The voltage max that can bear when being set at the battery module safe operation (load voltage value of battery module) deducts a voltage difference Δ V, and one step of morning downgrades charging current, with the fail safe of protection battery.
Get back to step S1220, if the voltage of battery module reaches the aforesaid first predeterminated voltage V 1The time, then represent the charging voltage that imposes on battery module to reach the higher limit that battery module can bear.This moment, present embodiment promptly entered the second stage (t=t of charging in order to ensure the fail safe of battery module 1～t 2), and the first predetermined current I of constant-current charge originally 1Downgrade, and battery module is kept with the second predetermined current I 2Carry out constant-current charge (step S1230), wherein this second predetermined current I 2Be the first predetermined current I 1Deduct electric current difference DELTA I, the size of this electric current difference DELTA I for example is the first predetermined current I of original constant-current charge 120%～50%, and do not limit its scope.
It should be noted that at battery module and keep with the second predetermined current I 2When carrying out constant-current charge, present embodiment judges further then whether the voltage of battery module reaches the second predeterminated voltage value V 2(step S1840).This second predeterminated voltage value V 2The voltage max that can bear when being the battery module safe operation (load voltage value of battery module), and reach this second predeterminated voltage value V when the voltage of battery module 2The time, promptly to represent the electric power of battery module to be close to fill full, this moment, present embodiment promptly entered the phase III (t=t of charging 2～t 3), and adjust the charging current that battery module is applied, so that battery module is kept with this second predeterminated voltage V 2Carry out constant-voltage charge (step S1850).
At last, then be whether the electric power of judging battery module is full of (step S1860) fully.When the electric power of battery module has filled when full, then can stop battery module charge (step S1870); Otherwise, when the electric power of battery module does not fill when full yet, then return step S1860, continue battery module is carried out constant-voltage charge, up to the electric power of battery module fill full till.
More than the 3rd to the 7th cited embodiment adopt the mode of " control charging current " to charging battery module, yet, as the relation of second embodiment (control charging voltage) with respect to first embodiment (control charging current), the the 3rd to the 7th embodiment also is applicable to that the mode of employing " control charging voltage " is to charging battery module, and its execution mode is all same or similar with second embodiment, so its detailed content does not repeat them here.
In sum, the method for multi-section charging cell module of the present invention has following advantage at least:
1. the voltage by each electric core in the monitoring battery module and joint group, and can avoid electric core and joint group to overcharge, safeguard the fail safe of electric core and joint group.
2. adopt the mode of multisection type charging, can under the situation of fail safe of guaranteeing to charge, take into account the lifting of charging rate.
3. adopt Current Control or voltage-controlled mode to charge, charge power supply is done the most effective utilization, and can meet user's various demands.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; anyly be familiar with this technical staff; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when the scope according to claim define.

Claims (20)

1. the method for the multi-section charging cell module of a portable electron device is applicable to a battery module that comprises a plurality of electric cores and joint group, it is characterized in that this charging method comprises the following steps:
A. with one first predetermined current this battery module is carried out constant-current charge;
B. judge whether one of them voltage of the described electric core of this battery module and joint group reaches one first predeterminated voltage;
C. when one of them voltage of described electric core and joint group reaches described first predeterminated voltage, the power supply that adjustment applies described battery module, the mode of described this power supply of adjustment is: the voltage soprano is kept with one second predetermined current carry out constant-current charge, wherein this second predetermined current deducts an electric current difference for this first predetermined current;
D. judge whether one of them voltage of the described electric core of this battery module and joint group reaches one second predeterminated voltage;
E. when one of them voltage of described electric core and joint group reaches second predeterminated voltage, this power supply that adjustment applies described battery module, the mode of described this power supply of adjustment is: the voltage soprano is kept with this second predeterminated voltage carry out constant-voltage charge;
Whether the electric power of f. judging this battery module fills full; And
G. keep with this second predeterminated voltage and carry out constant-voltage charge, up to the electric power of this battery module fill full till.
2. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, the voltage max that this first predeterminated voltage and this second predeterminated voltage can bear when being described electric core and joint group safe operation.
3. the method for multi-section charging cell module as claimed in claim 1, it is characterized in that, the voltage max that this first predeterminated voltage can bear when being described electric core and joint group safe operation deducts a voltage difference, this voltage max that this second predeterminated voltage can bear when then being described electric core and joint group safe operation.
4. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, in this step c, when one of them voltage of described electric core and joint group reaches this first predeterminated voltage, also comprises:
This power supply that adjustment applies this battery module is so that the voltage soprano keeps with this first predeterminated voltage and carries out constant-voltage charge in described electric core and the joint group; And
Whether the electric current of judging voltage soprano in described electric core and the joint group reaches one the 3rd predetermined current, and when the electric current of voltage soprano in described electric core and the joint group reaches the 3rd predetermined current, continue to adjust this power supply that this battery module is applied again, so that the voltage soprano keeps with this second predetermined current and carries out constant-current charge in described electric core and the joint group.
5. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, also comprises before this step a:
This battery module is carried out a trickle charge; And
Whether the voltage of judging this battery module reaches a charging start voltage, and when the voltage of this battery module reaches this charging start voltage, begins this battery module kept with this first predetermined current to carry out constant-current charge.
6. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, also comprises after this step b:
If when the voltage of described electric core and joint group does not all reach this first predeterminated voltage, return this step a, continuation is kept with this first predetermined current this battery module and is carried out constant-current charge.
7. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, the mode of adjusting this power supply that this battery module is applied comprise a charging current that adjustment applies this battery module and a charging voltage one of them.
8. the method for multi-section charging cell module as claimed in claim 7, it is characterized in that, when the mode of adjusting this power supply that this battery module is applied when adjusting this charging current, then adjust this power supply that this battery module is applied among this step e so that this battery module is kept the step of carrying out constant-voltage charge with this second predeterminated voltage comprises:
This charging current that e1. will offer this battery module reduces a standard;
E2. judge whether described each the electric core of this battery module and the voltage of joint group reach this second predeterminated voltage;
E3. when one of them voltage of described electric core and joint group reached this second predeterminated voltage, this charging current that will offer this battery module again reduced this standard; And
E4. repeat above-mentioned steps e2 and e3, carry out constant-voltage charge so that this battery module is kept with this second predeterminated voltage.
9. the method for multi-section charging cell module as claimed in claim 7, it is characterized in that, when the mode of adjusting this power supply that this battery module is applied when adjusting this charging voltage, then adjust this power supply that this battery module is applied among this step e so that this battery module is kept the step of carrying out constant-voltage charge with this second predeterminated voltage comprises:
This charging voltage that e1. will offer this battery module reduces a standard;
E2 judges whether described each the electric core of this battery module and the voltage of joint group reach this second predeterminated voltage;
When e3 reached this second predeterminated voltage when one of them voltage of described electric core and joint group, this charging voltage that will offer this battery module again reduced this standard; And
E4 repeats above-mentioned steps e2 and e3, carries out constant-voltage charge so that this battery module is kept with this second predeterminated voltage.
10. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, whether the electric power of judging this battery module fills full mode comprises:
Judge that whether the electric current that passes through this battery module is less than a minimum current;
If the electric current that passes through this battery module judges then that less than this minimum current the electric power of this battery module has filled full; And
If the electric current that passes through this battery module judges then that greater than this minimum current the electric power of this battery module does not fill full yet.
11. the method for multi-section charging cell module as claimed in claim 1 is characterized in that, each described electric core and joint group comprise a plurality of electric cores in parallel.
12. the method for the multi-section charging cell module of a portable electron device is applicable to a battery module, it is characterized in that, this charging method comprises the following steps:
A. adjust the power supply that this battery module is applied and carry out constant-current charge so that battery module is kept with one first predetermined current, the mode of wherein adjusting this power supply that this battery module is applied is for adjusting this charging current;
Whether the voltage of b. judging this battery module reaches one first predeterminated voltage;
C. when if the voltage of described battery module reaches described first predeterminated voltage, this charging current that adjustment applies this battery module, carry out constant-current charge so that this battery module is kept with one second predetermined current, wherein this second predetermined current deducts an electric current difference for this first predetermined current;
Whether the voltage of d. judging this battery module reaches one second predeterminated voltage;
E. when if the voltage of described battery module reaches second predeterminated voltage, adjust this charging current that this battery module is applied, comprise so that this battery module is kept the step of carrying out constant-voltage charge with this second predeterminated voltage:
This charging current that e1. will offer this battery module reduces a standard;
Whether the voltage of e2. judging this battery module reaches this second predeterminated voltage;
E3. when the voltage of this battery module reached this second predeterminated voltage, this charging current that will offer this battery module again reduced this standard; And
E4. repeat above-mentioned steps e2 and e3, carry out constant-voltage charge so that this battery module is kept with this second predeterminated voltage;
Whether the electric power of f. judging this battery module fills full; And
G. keep with this second predeterminated voltage and carry out constant-voltage charge, up to the electric power of this battery module fill full till.
13. the method for multi-section charging cell module as claimed in claim 12 is characterized in that, the voltage max that this first predeterminated voltage and this second predeterminated voltage can bear when being this battery module safe operation.
14. the method for multi-section charging cell module as claimed in claim 12, it is characterized in that, the voltage max that this first predeterminated voltage can bear when this battery module safe operation deducts a voltage difference, this voltage max that this second predeterminated voltage can bear during then for described battery module safe operation.
15. the method for multi-section charging cell module as claimed in claim 12 is characterized in that, in this step c, when the voltage of this battery module reaches this first predeterminated voltage, more comprises:
Adjust this charging current that this battery module is applied earlier, carry out constant-voltage charge so that this battery module is kept with this first predeterminated voltage; And
Whether the electric current of judging this battery module reaches one the 3rd predetermined current, and when the electric current of this battery module reaches the 3rd predetermined current, continue again to adjust this charging current that this battery module is applied, carry out constant-current charge so that this battery module is kept with this second predetermined current.
16. the method for multi-section charging cell module as claimed in claim 12 is characterized in that, also comprises before this step a:
This battery module is carried out a trickle charge; And
Whether the voltage of judging this battery module reaches a charging start voltage, and when the voltage of this battery module reaches this charging start voltage, begins this battery module kept with this first predetermined current to carry out constant-current charge.
17. the method for multi-section charging cell module as claimed in claim 12 is characterized in that, also comprises after this step b:
If when the voltage of this battery module does not reach this first predeterminated voltage, return this step a, continuation is kept with this first predetermined current this battery module and is carried out constant-current charge.
18. the method for the multi-section charging cell module of a portable electron device is applicable to a battery module, it is characterized in that, this charging method comprises the following steps:
A. adjust the power supply that battery module is applied and carry out constant-current charge so that battery module is kept with one first predetermined current, the mode of wherein adjusting this power supply that this battery module is applied is for adjusting this charging voltage;
Whether the voltage of b. judging this battery module reaches one first predeterminated voltage;
C. when if the voltage of battery module reaches first predeterminated voltage, this charging voltage that adjustment applies battery module, carry out constant-current charge so that battery module is kept with one second predetermined current, wherein this second predetermined current is that first predetermined current deducts an electric current difference;
Whether the voltage of d. judging this battery module reaches one second predeterminated voltage;
E. when if the voltage of battery module reaches second predeterminated voltage, adjust this charging voltage that battery module is applied, comprise so that battery module is kept the step of carrying out constant-voltage charge with second predeterminated voltage:
This charging voltage that e1. will offer this battery module reduces a standard;
Whether the voltage of e2. judging this battery module reaches this second predeterminated voltage;
E3. when the voltage of this battery module reached this second predeterminated voltage, this charging voltage that will offer this battery module again reduced this standard; And
E4. repeat above-mentioned steps e2 and e3, carry out constant-voltage charge so that this battery module is kept with this second predeterminated voltage.
Whether the electric power of f. judging this battery module fills full; And
G. keep with this second predeterminated voltage and carry out constant-voltage charge, up to the electric power of this battery module fill full till.
19. the method for multi-section charging cell module as claimed in claim 18, it is characterized in that, the voltage max that this first predeterminated voltage can bear when this battery module safe operation deducts a voltage difference, this voltage max that this second predeterminated voltage can bear during then for described battery module safe operation.
20. the method for multi-section charging cell module as claimed in claim 18, it is characterized in that, in this step c, when the voltage of this battery module reaches this first predeterminated voltage, more comprise: adjust this charging voltage that battery module is applied earlier, carry out constant-voltage charge so that battery module is kept with first predeterminated voltage; And
Whether the electric current of judging battery module reaches one the 3rd predetermined current, and when the electric current of battery module reaches the 3rd predetermined current, continue again to adjust this charging voltage that battery module is applied, carry out constant-current charge so that battery module is kept with second predetermined current.
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