CN102148410A - Method for charging battery - Google Patents

Method for charging battery Download PDF

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Publication number
CN102148410A
CN102148410A CN2010101117423A CN201010111742A CN102148410A CN 102148410 A CN102148410 A CN 102148410A CN 2010101117423 A CN2010101117423 A CN 2010101117423A CN 201010111742 A CN201010111742 A CN 201010111742A CN 102148410 A CN102148410 A CN 102148410A
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CN
China
Prior art keywords
battery
voltage
control circuit
charging
interval
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CN2010101117423A
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Chinese (zh)
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CN102148410B (en
Inventor
陈泰宏
陈明达
黄国彰
傅志仁
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新普科技股份有限公司
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Priority to CN201010111742.3A priority Critical patent/CN102148410B/en
Publication of CN102148410A publication Critical patent/CN102148410A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention provides a method for charging a battery. The method is used for prolonging the service life of the battery; the method for charging the battery is mainly as follows: proper charge cut-off voltage is adjusted along with variation of at least one of residual capacity, idle time and the like of the battery, furthermore, the charge cut-off voltage is not a fixed value and can change along with the current state of the battery, thereby increasing the charging efficiency of the battery; in addition, the invention additionally provides a charging method which can adjust proper charge cut-off current along with the variation of actual capacity of the battery. The circuit is low in implementation cost, only the charging law of software needs to be changed, the service life of the battery can be prolonged, and the charging method is safer.

Description

Method for charging batteries
Technical field
The present invention relates to a kind of method for charging batteries, refer to a kind of use habit that can write down the user especially, repair or reduce so that the charging cut-ff voltage of battery is done, so as to the method for charging batteries of extending battery life.
Background technology
Lithium battery is because of the restriction of material characteristic, and its charging voltage generally must not surpass the 4.2V/ battery, otherwise will greatly reduce useful life, and is too many if charging voltage surpasses simultaneously, and lithium battery has the danger existence of burning or blast.
With reference to figure 1, be traditional lithium cell charging curve synoptic diagram.The charging modes of lithium battery carries out constant-current charge at first, as curve I, afterwards, carries out constant-voltage charge and is full of electricity, as curve V.Initial constant-current charge proceeds to till the charging cut-ff voltage Voff that cell voltage rises to setting.When cell voltage rises to charging cut-ff voltage Voff, promptly switch to constant-voltage charge, continue to rise to avoid cell voltage.At this moment, charging current reduces under constant-voltage charge gradually, and when battery current dropped to a charging cut-off current Ioff of setting, the expression battery was for being full of electricity condition.
In traditional charging method, a kind of pulse charge method that utilizes the open and close of cutoff switch modulation charging current is arranged, with to lithium cell charging.But, this kind method usually can be not good because of control, and cause the infringement in lithium battery life-span.In addition, the switching of cutoff switch also can cause damage, and in the process that cutoff switch switches, has been easy to the surging high voltage and has damage lithium battery, and then shortens the life-span of lithium battery.
In traditional charging method, other has a kind of utilization to discharge and recharge the charging method that number of times repaiies down the charging cut-ff voltage.But if the user is under the incomplete situation in the situation of using battery, just battery has not been put electricity and is just charged or do not have under the situation that full charging just discharges, and is in again or always under the state of charging (promptly being connected in the state of power adapter).Under afore-mentioned, will cause this kind utilization to discharge and recharge number of times and come following charging method of repairing the charging cut-ff voltage can't revise the charging cut-ff voltage smoothly.
Therefore, in the control of traditional lithium cell charging, major part is to do the modulation of charging at lithium battery state instantly, does not change the charging modes of charging cut-ff voltage relatively according to user's use habit.
Summary of the invention
The invention provides a kind of method for charging batteries, in order to promote battery life.Method for charging batteries of the present invention mainly be along with battery remaining power and standby time etc. at least wherein a change and adjust suitable charging cut-ff voltage, and, the charging cut-ff voltage is not a fixed value, its meeting is along with the current state of battery changes to some extent, and then the efficiency for charge-discharge of increase battery.In addition, the method for charging batteries of embodiments of the invention except along with battery remaining power and standby time etc. at least wherein a change and adjust suitable charging cut-ff voltage, more comprise the charging method of adjusting suitable charging cut-off current along with the change of the actual capacity of battery.
The method for charging batteries of embodiments of the invention offers a control circuit and carries out, by with determine one the charging cut-off current, and then according to this charging cut-off current to a battery charge, this method comprises: utilize this control circuit to read a battery actual capacity parameter, the percentage after this battery actual capacity parameter represents a battery actual capacity or this battery actual capacity divided by a battery design capacity; Utilize this control circuit to read a preset rules, this preset rules defines a plurality of battery capacities interval, and those battery capacity intervals comprise the interval and one second battery capacity interval of one first battery capacity; Utilize this control circuit to judge whether this battery actual capacity parameter falls within this first or second battery capacity interval; When this control circuit judges that this battery actual capacity parameter falls within this first battery capacity interval, charge cut-off current to this battery charge according to one first; And when this control circuit judges that this battery actual capacity parameter falls within this second battery capacity interval, charge cut-off current to this battery charge according to one second; Wherein this first and second battery capacity is interval different, and this first charging cut-off current is less than this second charging cut-off current.
The method for charging batteries of embodiments of the invention offers a control circuit and carries out, by with determine one the charging cut-ff voltage, and then according to this charging cut-ff voltage to a battery charge, this method comprises: utilize this control circuit to write down an actual standby time of this battery; Utilize this control circuit to read a preset rules, this preset rules defines between a plurality of battery lay-up periods, comprises between those battery lay-up periods to reach between one second battery lay-up period between one first battery lay-up period; Utilize this control circuit to judge and whether fall within this actual standby time between this first or second battery lay-up period; When this control circuit is judged when falling within this actual standby time between this first battery lay-up period, according to one first charging cut-ff voltage to this battery charge; And when this control circuit judges that this battery actual capacity falls between this second battery lay-up period, charge cut-ff voltage to this battery charge according to one second; Wherein different between this first and second lay-up period, and this first charging cut-ff voltage is greater than this second charging cut-ff voltage.
The method for charging batteries of embodiments of the invention, offering a control circuit carries out, by with determine one the charging cut-ff voltage, and then according to this charging cut-ff voltage to a battery charge, this method comprises: utilize this control circuit to read a battery remaining power parameter, the percentage after this battery remaining power parameter represents a battery remaining power or this battery remaining power divided by a battery actual capacity; Utilize this control circuit to read a preset rules, this preset rules defines a plurality of battery remaining powers interval, and those battery remaining power intervals comprise the interval and one second residual capacity interval of one first residual capacity; Utilize this control circuit to judge whether this battery remaining power parameter falls within this first or second residual capacity interval; When this control circuit judges that this battery remaining power parameter falls within this first residual capacity interval, charge cut-ff voltage to this battery charge according to one first; And when this control circuit judges that this battery remaining power parameter falls within this second residual capacity interval, charge cut-ff voltage to this battery charge according to one second; Wherein this first and second residual capacity is interval different, and this first and second charging cut-ff voltage difference.
The method for charging batteries of embodiments of the invention offers a control circuit and carries out, by with determine one the charging cut-ff voltage, and then according to this charging cut-ff voltage to a battery charge, this method comprises: utilize this control circuit to read a battery status parameter, this battery status parameter comprise an actual standby time and a battery remaining power parameter at least wherein one; Utilize this control circuit to read a preset rules, this preset rules defines a plurality of battery statuss interval, this a plurality of battery statuss interval refers between a plurality of battery lay-up periods and/or a plurality of battery remaining powers interval, this a plurality of battery statuss interval comprise between one first state area and one second state area between; Utilize this control circuit to judge whether this battery status parameter falls between this first or second state area; When this control circuit judges that this battery status parameter falls between this first state area, charge cut-ff voltage to this battery charge according to one first; And when this control circuit judges that this battery status parameter falls between this second state area, charge cut-ff voltage to this battery charge according to one second; Wherein different between this first and second state area, and this first and second charging cut-ff voltage difference.
So, present embodiment can reach following advantage: circuit realizes that cost is low, only need to change software the charging rule, can extend the life of a cell and charging method safer.
Description of drawings
Fig. 1 is traditional lithium cell charging curve synoptic diagram;
Fig. 2 is the battery pack schematic diagram that is recharged of the present invention;
Fig. 3 is the battery charge cut-off current of embodiments of the invention and the pass schematic diagram of battery health degree;
Fig. 4 is the battery charge cut-ff voltage of embodiments of the invention and the pass schematic diagram of battery standby time;
Fig. 5 is the battery charge cut-ff voltage of embodiments of the invention and the pass schematic diagram of battery remaining power;
Fig. 6 is that schematic diagram is closed in the battery charge cut-ff voltage of embodiments of the invention and the application of battery remaining power;
Fig. 7 is the pass schematic diagram of battery charge cut-ff voltage, battery remaining power and the standby time of embodiments of the invention; And
Fig. 8 adjusts the schematic diagram of charging cut-ff voltage for the present invention adopts two residual capacity intervals.
[main element description of reference numerals]
Battery pack 10
Electronic installation 30
Adapter 40
Battery 11
Current detection circuit 12
Control circuit 13
Switch element 14
Telecommunication circuit 15
Temperature Detector 16
Discharge switch element 14A
Charging switch element 14B
Exchange commercial power AC
Direct current power DC
Embodiment
According to embodiments of the invention, method for charging batteries is under constant-current charge, according to standby time (Idle time), residual capacity percentage (the Relative State Of Charge of battery; RSOC) or the combination in any of above-mentioned two kinds of bases, decide a suitable charging cut-ff voltage with linear or nonlinear preset rules, and when rising to this charging cut-ff voltage, cell voltage changes constant-voltage charge into, this moment, this method for charging batteries can decide a suitable charging cut-off current further according to the value of actual capacity (FCC).And under constant-voltage charge, when charging current reduces to this charging cut-off current, judge that battery is for being full of.
For convenience of description, the described battery pack of following examples is an example with the lithium battery group, yet, this is not a limitation of the present invention, every battery pack that needs suitable charging cut-ff voltage of decision and/or charging cut-off current, no matter whether be the lithium battery group, can use method for charging batteries of the present invention.
Please refer to Fig. 2.The battery pack 10 of Fig. 2 display application charging method of the present invention.As shown in Figure 2, battery pack 10 is installed in the electronic installation 30.Battery pack 10 can be charged via the electronic installation of being installed 30, also can be to electronic installation 30 supply capabilities.Aforesaid electronic installation 30 can also can be electric carrier (as electric motor car) or other driven by power product for electronic multimedia products such as digital camera, mobile phone, personal digital assistant device or notebook computers.Battery pack 10 is installed in electronic installation 30 in removable mode usually.But, battery pack 10 also has in the mode with not dismounting and is built in electronic installation 30.
Under the state that an electronic installation 30 and an adapter 40 (Adapter) electrically connect, adapter 40 will convert direct current power DC to from the alternating electromotive force AC of socket (not indicating), so that electronic installation 30 is supplied with direct current power DC.Electronic installation 30 possesses the power circuit (not icon) of the direct current power DC that is supplied with from adapter 40 in order to control.The output of power circuit can be charged to battery pack 10, and to electronic installation 30 supply capabilities.In addition, not under the state of adapter 40 supply capabilities, battery pack 10 can be to electronic installation 30 supply capabilities.
Battery pack 10 possesses at least one battery 11 is arranged, and each battery 11 can be a lithium battery, and can charge; The electric current of current detection circuit 12 when detecting the discharging and recharging of battery 11; Control circuit 13 is in order to monitor and the situation about discharging and recharging of controlling battery 11; Switch element 14 is controlled by control circuit 13, to carry out the change action of conducting or shutoff (on/off); Telecommunication circuit 15 is used for communicating with electronic installation 30.And the battery pack 10 among second figure also possesses a Temperature Detector 16, and Temperature Detector 16 is used for detecting the temperature of battery 11.
Multiple with reference to figure 2.Control circuit 13 receives the cell voltage of each battery 11, from the output signal of current detection circuit 12 and from the output signal of Temperature Detector 16; Record battery 11 residual capacity (Remaining Capacity instantly; RC) with actual capacity (FullCharge Capacity; Numerical value such as FCC); And according to battery design capacity (DesignCapacity; DC) etc. numerical value is made calculation process.Control circuit 13 can be according to operation result, and control switch element 14 carries out conducting or cut-out.Control circuit 13 is residual capacity percentage (RSOC) with battery 11 residual capacity (RC) instantly divided by the resulting percentage in actual capacity (FCC) back.Control circuit 13 is battery health degree (State of Health with the actual capacity (FCC) of battery 11 divided by the resulting percentage in design capacity (DC) back again; SOH).Note that control circuit 13 can comprise storage unit (figure show), write down in order to store and/or the numerical value of computing, owing to the enforcement of storage unit and the access of 13 pairs of storage units of control circuit belong to the common knowledge in present technique field, so do not repeat them here.
Moreover control circuit 13 goes out to be full of electricity with control switch element 14 from the voltage detecting of battery 11.In addition, control circuit 13 cuts off switch element 14 when detecting the abnormal current that flows into battery 11, abnormal temperature or abnormal voltage, and breaking current is with protection battery 11.
Switch element 14 is a field-effect transistor (FET), and it has parasitic diode.Therefore, switch element 14 can utilize parasitic diode to make reverse current flowing under dissengaged positions.Aforesaid switch element 14 is by forming with being connected in series with switch element 14B in order to the charging of interdicting charging current with switch element 14A in order to the discharge of the discharging current of blocking battery 11.
When the voltage of the battery 11 that is discharging dropped to minimum voltage, control circuit 13 cut off discharge switch element 14A, with the discharging current of blocking battery 11.At this moment, the discharge that is dissengaged positions can utilize parasitic diode to make the charging current circulation with switch element 14A.Thereby when the voltage of circulation charging current and battery 11 rose, discharge just can be switched into conducting state from dissengaged positions with switch element 14A, and is the state that can discharge.
When electronic installation 30 received direct current power DC by adapter 40, control circuit 13 was obtained the information that electronic installation 30 can charge to battery 10 from telecommunication circuit 15.Control circuit 13 is controlled charging switch element 14B conducting according to this information, and earlier with constant-current charge, again with constant-voltage charge, so that battery 11 is full of.
Cooperate Fig. 2, with reference to figure 3.Fig. 3 shows the schematic diagram that concerns of the battery charge cut-off current of one embodiment of the invention and battery health degree.When telecommunication circuit 15 obtained the information that electronic installation 30 can charge to battery 10, the method that control circuit 13 is carried out present embodiments to be determining a charging cut-off current Ioff at control circuit 13, so according to this charging cut-off current Ioff to battery 11 chargings.
The method of present embodiment comprises following steps: at first, control circuit 13 reads a battery actual capacity parameter, and aforesaid battery actual capacity parameter is represented battery actual capacity (FCC) or battery health degree (SOH).Present embodiment adopts the representative of battery health degree (SOH) as battery actual capacity parameter.
Then, control circuit 13 reads a preset rules, this preset rules defines a plurality of battery capacities interval, and defined those battery capacity intervals of the preset rules of present embodiment comprise one first battery capacity interval, one second battery capacity is interval and one the 3rd battery capacity interval.In aforementioned, first, second are all different with the 3rd battery capacity interval, and the interval expression of first battery capacity battery health degree (SOH) scope is located at 95% to 100%.The interval expression of second battery capacity battery health degree (SOH) scope is located at 80% to 95%.The interval expression of the 3rd battery capacity battery health degree (SOH) scope is located at below 80%.
Then, control circuit 13 judges the battery actual capacity parameter that is read falls within aforementioned which battery capacity interval.When control circuit 13 judges that battery actual capacity parameter falls within first battery capacity interval, will be according to one first charging cut-off current Ioff1 to battery 11 chargings.In addition, when control circuit 13 judges that battery actual capacity parameter falls within second battery capacity interval, will be according to one second charging cut-off current Ioff2 to battery 11 chargings.In addition, when control circuit 13 judges that battery actual capacity parameter falls within the 3rd battery capacity interval, will be according to one the 3rd charging cut-off current Ioff3 to battery 11 chargings.
In aforementioned, the first charging cut-off current Ioff1 is less than the second charging cut-off current Ioff2, and the second charging cut-off current Ioff2 is less than the 3rd charging cut-off current Ioff3.In the present embodiment, the first charging cut-off current Ioff1 and the 3rd charging cut-off current Ioff3 are the essence fixed value, that is the first charging cut-off current Ioff1 is set at 150mA, and the 3rd charging cut-off current Ioff3 is set at 500mA.In addition, the second charging cut-off current Ioff2 is the change value, big or small relative one-tenth one proportionate relationship of the battery actual capacity parameter that its size and control circuit 13 are read.
So improve the charging method of charging cut-off current Ioff, can increase the life-span of battery along with the decline of the residual capacity percentage (RSOC) of battery.
Cooperate Fig. 2, with reference to figure 4.Fig. 4 shows the schematic diagram that concerns of the battery charge cut-ff voltage of embodiments of the invention and battery standby time.It is a kind of according to battery standby time that the present invention more provides, as the charging method of the setting of the charging cut-ff voltage Voff of battery 11.The method of present embodiment offers control circuit 13 and carries out, by determining a charging cut-ff voltage Voff, and then according to charging cut-ff voltage Voff with to battery 11 chargings.
The method of present embodiment comprises following steps: at first, and an actual standby time (idle time) of control circuit 13 record batteries 11.Then, control circuit 13 reads a preset rules, this preset rules defines between a plurality of battery lay-up periods, comprise between one first battery lay-up period between those battery lay-up periods of present embodiment, between one second battery lay-up period and between one the 3rd battery lay-up period, in aforementioned, first, second with the 3rd lay-up period between all different.
Then, control circuit 13 judges to fall between aforementioned which battery lay-up period the actual standby time (idle time) of being write down.When control circuit 13 judges that fall between the first battery lay-up period the actual standby time of battery 11, will be according to one first charging cut-ff voltage Voff1 to battery 11 chargings.In addition, when control circuit 13 judges that fall between the second battery lay-up period the actual standby time of battery 11, will be according to one second charging cut-ff voltage Voff2 to battery 11 chargings.In addition, when control circuit 13 judges that fall between the 3rd battery lay-up period the actual standby time of battery 11, will be according to one the 3rd charging cut-ff voltage Voff3 to battery 11 chargings.
In aforementioned, the first charging cut-ff voltage Voff1 is greater than the second charging cut-ff voltage Voff2, and the second charging cut-ff voltage Voff2 is greater than the 3rd charging cut-ff voltage Voff3.In the present embodiment, the first charging cut-ff voltage Voff1 and the 3rd charging cut-ff voltage Voff3 are the essence fixed value, that is the first charging cut-ff voltage Voff1 is set at the 4.2V/ battery, and the 3rd charging cut-ff voltage Voff3 is set at the 4.1V/ battery.In addition, the second charging cut-ff voltage Voff2 is the change value, big or small relative one-tenth one proportionate relationship of its size and the actual standby time of control circuit 13 battery that writes down 11.
In the present embodiment, the standby time that control circuit 13 is judged battery 11 is when surpassing 24HR, originally predeterminated voltage value Δ V to the 4.19V/ battery of the charging cut-ff voltage Voff decline 10mV/ battery of 4.2V/ battery will be set, and record charging cut-ff voltage Voff is the 4.19V/ battery.Then, the standby time of battery 11 is when surpassing 24HR once more, control circuit 13 is with descend again predeterminated voltage value Δ V to the 4.18V/ battery of 10mV/ battery of the preceding charging cut-ff voltage Voff that once notes down the 4.19V/ battery, and record charging cut-ff voltage Voff is the 4.18V/ battery.By that analogy, charging cut-ff voltage Voff is along with descend standby time behind the 4.1V/ battery, if, battery 11 still is in idle state, then the control circuit 13 charging cut-ff voltage Voff that will set the 4.1V/ battery directly rises to the 4.2V/ battery, and record charging cut-ff voltage Voff is the 4.2V/ battery, and continues the aforesaid record step of execution that repeats.
So, the charging method of present embodiment is, according to the number of times that surpasses 11 standby times of battery Preset Time (24HR), the size of relative modulation charging cut-ff voltage Voff makes being set between 4.2V/ battery and the 4.1V/ battery that charging cut-ff voltage Voff repeats.So, when telecommunication circuit 15 obtained the information that electronic installation 30 can charge to battery 10, control circuit 13 utilized the charging cut-ff voltage Voff that is noted down, to transfer the foundation of constant-voltage charge to from constant-current charge as battery 11 at control circuit 13.
Cooperate Fig. 2, with reference to figure 5.Fig. 5 shows the schematic diagram that concerns of the battery charge cut-ff voltage of embodiments of the invention and battery remaining power.The present invention more provides and surpasses Preset Time (24HR for example, but not as limit a kind of standby time at battery 11.Please note, the present technique field has knows that usually the knowledgeable is appreciated that this embodiment is not setting under the situation of Preset Time, still can implement) time, along with the battery remaining power parameter of battery 11 falls into a battery remaining power interval, and with respect to this battery remaining power interval, to reduce, to improve or keep the charging method of the charging cut-ff voltage Voff of battery 11.
The method of present embodiment offers control circuit 13 and carries out, so as to determining a charging cut-ff voltage Voff, and then according to charging cut-ff voltage Voff with to battery 11 chargings.
The method of present embodiment comprises following steps: at first, control circuit 13 reads a battery remaining power parameter, and this battery remaining power parameter is represented battery remaining power (RemainingCapacity; RC) or the percentage of this battery remaining power after, i.e. residual capacity percentage (RSOC) divided by battery actual capacity (Full ChargeCapacity).Then, control circuit 13 reads a preset rules, and this preset rules defines a plurality of battery remaining powers interval, and those battery remaining power intervals of present embodiment comprise one first residual capacity interval, one second residual capacity is interval and one the 3rd residual capacity interval.In aforementioned, first, second are all different with the 3rd residual capacity interval.
Then, control circuit 13 judges the battery remaining power parameter that is read falls within aforementioned which residual capacity interval.When control circuit 13 judges that the battery remaining power parameter falls within first residual capacity interval, will be according to one first charging cut-ff voltage to battery 11 chargings.In addition, when control circuit 13 judges that the battery remaining power parameter falls within this second residual capacity interval, will be according to one second charging cut-ff voltage to battery 11 chargings.In addition, when control circuit 13 judges that the battery remaining power parameter falls within the 3rd residual capacity interval, will be according to one the 3rd charging cut-ff voltage to battery 11 chargings.In aforementioned, first, second with the 3rd charging cut-ff voltage in the two is different at least.
Multiple with reference to figure 2 and Fig. 5.In the present embodiment, the interval expression of first residual capacity residual capacity percentage (RSOC) scope is located at 100%~80%, the interval expression of the 3rd residual capacity residual capacity percentage (RSOC) scope is located at below 20%, and the interval expression of second residual capacity residual capacity percentage (RSOC) scope is located at 80%~60%, 60%~40%, 40%~20% respectively.
And, provide one to revise voltage respectively with respect to aforementioned five kinds of residual capacity percentages (RSOC) scope.In aforementioned, the correction voltage of the correction voltage of 100%~80% scope correspondence-20mV/ battery, 80%~60% scope correspondence-10mV/ battery, the correction voltage of the corresponding 0mV/ battery of 60%~40% scope, the correction voltage and the 20% following scope of 40%~20% scope correspondence+10mV/ battery are fixed as the 4.2V/ battery.
In the present embodiment, when control circuit 13 when telecommunication circuit 15 obtains the information that electronic installation 30 can charge to battery 10, control circuit 13 judges which residual capacity percentage (RSOC) scope the residual capacity percentage (RSOC) of battery 11 falls into, and according to pairing correction voltage, set the size of charging cut-ff voltage Voff and record in addition, to transfer the foundation of constant-voltage charge to from constant-current charge as battery 11.
Multiple with reference to figure 5.On using, when the residual capacity percentage (RSOC) of battery 11 fell into 100%~80% scope, charging cut-ff voltage Voff became 4.18V/ battery and record from the correction voltage of 4.2V/ battery reduction 20mV/ battery.Then, when falling into 80%~60% scope, charging cut-ff voltage Voff becomes 4.17V/ battery and record from the correction voltage of 4.18V/ battery reduction 10mV/ battery.Then, when falling into 60%~40% scope, the magnitude of voltage of keeping recorded charging cut-ff voltage Voff is at the 4.17V/ battery.Then, when falling into 40%~20% scope, charging cut-ff voltage Voff becomes 4.18V/ battery and record from the correction voltage of 4.17V/ battery raising 10mV/ battery.Then, during less than 20% scope, charging cut-ff voltage Voff directly is increased to 4.2V/ battery and record from the 4.18V/ battery.
Multiple with reference to figure 6.Fig. 6 shows that the battery charge cut-ff voltage of embodiments of the invention and the application of battery remaining power concern schematic diagram.Use in the each chargings of battery 11, when the residual capacity percentage (RSOC) of battery 11 is 10%, the cut-ff voltage Voff that then charges is made as 4.2V/ battery and record.Charging, and the residual capacity percentage (RSOC) of battery 11 once more is 95%, and the cut-ff voltage Voff that then charges reduces the 20mV/ battery from the 4.2V/ battery, and is made as 4.18V/ battery and record.Charging once more, the residual capacity percentage (RSOC) of battery 11 is 10%, the cut-ff voltage Voff that then charges will directly bring up to 4.2V/ battery and record from the 4.18V/ battery.Charging once more, the residual capacity percentage (RSOC) of battery 11 is 70% o'clock, the cut-ff voltage Voff that then charges reduces the 10mV/ battery to 4.19V/ battery and record from the 4.2V/ battery.Once more the charging, the residual capacity percentage (RSOC) of battery 11 is 30%, the cut-ff voltage Voff that then charges from 4.19V/ battery rising 10mV/ battery to 4.2V/ battery and record.Charging once more, the residual capacity percentage (RSOC) of battery 11 is 50%, the cut-ff voltage Voff that then charges keeps the 4.2V/ battery.
Cooperate Fig. 2, with reference to figure 4.Fig. 7 show embodiments of the invention battery charge cut-ff voltage, battery remaining power and standby time concern schematic diagram.
When control circuit 13 when telecommunication circuit 15 obtains the information that electronic installation 30 can charge to battery 10, control circuit 13 is judged the standby time of residual capacity percentage (RSOC) with the battery 11 of battery, and according to judged result, set the size of charging cut-ff voltage Voff and record in addition, to transfer the foundation of constant-voltage charge to from constant-current charge as battery 11.
The method of present embodiment offers control circuit 13 and carries out, by determining a charging cut-ff voltage Voff, and then according to charging cut-ff voltage Voff with to battery 11 chargings.The method of present embodiment comprises following steps: at first, control circuit 13 reads a battery status parameter, this battery status parameter comprise aforementioned actual standby time of carrying (idle time) and battery remaining power parameter at least one of them.
Then, control circuit 13 reads a preset rules, and this preset rules defines a plurality of battery statuss interval, and this a plurality of battery statuss interval refers between aforementioned a plurality of battery lay-up periods of carrying and/or a plurality of battery remaining powers interval.This a plurality of battery statuss interval comprises the interval G3 of G2 and a third state between G1 between one first state area, one second state area, wherein this first, second equal different with third state interval (G1, G2, G3).
Then, control circuit 13 judges the battery status parameter that is read falls between aforementioned which state area.When control circuit 13 judges that the battery status parameters fall between first state area G1, will be according to one first charging cut-ff voltage to battery 11 chargings.In addition, when control circuit 13 judges that the battery status parameters fall between this second state area G2, will be according to one second charging cut-ff voltage to battery 11 chargings.In addition, when control circuit 13 judges that the battery status parameters fall within the interval G3 of this third state, will be according to one the 3rd charging cut-ff voltage to battery 11 chargings, wherein, this first, second charge in the cut-ff voltage at least with the 3rd that the two is different.
As shown in Figure 7, curve B is the charging cut-ff voltage Voff of battery 11, and curve C is the value of the residual capacity percentage (RSOC) of battery 11.Charging cut-ff voltage Voff can surpass Preset Time (24HR) along with the standby time of each battery 11, and reduces predeterminated voltage value Δ V and record.What therefore, the charging cut-ff voltage Voff of battery 11 can repeat is set between 4.1V/ battery and the 4.2V/ battery.In addition, surpass Preset Time (24HR for example, but the standby time of battery 11 not as limit.Please note, one of ordinary skill in the art will appreciate that this embodiment is not setting under the situation of Preset Time, still can implement) time, the battery remaining power interval that charging cut-ff voltage Voff can be fallen into respect to the residual capacity percentage (RSOC) of battery 11, and reduce relatively, improve or keep.
So, the method for charging batteries of present embodiment mainly is one of them change at least of actual standby time (idle time) along with battery and residual capacity percentage (RSOC) and adjusts suitable charging cut-ff voltage, and, the charging cut-ff voltage is not a fixed value, its meeting is along with battery 11 present states change to some extent, and then the efficiency for charge-discharge of increase battery 11.Simultaneously, the method for charging batteries of present embodiment provides the clever type charging modes of self-teaching, and this kind charging modes can write down user's use habit, repaiies or reduces so that the charging cut-ff voltage of battery 11 is done, by with extending battery life.In addition, present embodiment is after having determined charging cut-ff voltage and a battery also to charge to reach this charging cut-ff voltage, can come according to battery health degree (SOH) to adjust the charging cut-off current according to the pairing embodiment of Fig. 3 again, that is embodiment shown in Figure 7 can combine with embodiment shown in Figure 3, and becomes another embodiment.
Please note, although aforementioned each embodiment is an example with between three battery capacity intervals, three battery lay-up periods and three residual capacity intervals respectively, enforcement of the present invention also can only adopt two battery capacity intervals to adjust between charging cut-off current, two battery lay-up periods and/or the charging cut-ff voltage is adjusted in two residual capacity intervals.As shown in Figure 8, it adjusts the schematic diagram of charging cut-ff voltage for the present invention adopts two residual capacity intervals, as shown in Figure 8, when residual capacity percentage (RSOC) was positioned at 100% to 50% interval, charging was decremented to 4.1V by 4.2V by electric weight gradually along with the minimizing of RSOC; And when residual capacity percentage (RSOC) was positioned at 50% to 0% interval, charging was incremented to 4.2V by 4.1V by electric weight gradually along with the minimizing of RSOC.Usually know that the knowledgeable can be according to each embodiment in three disclosed intervals because the present technique field has, derive two intervals or interval execution mode more than three, so promptly no longer given unnecessary details at different interval number purpose enforcement in this.
But the above only is the detailed description and the accompanying drawing of the best specific embodiment of the present invention, those of ordinary skills in the field of the invention, can think easily and variation or revise all can be encompassed in protection scope of the present invention.

Claims (9)

1. a method for charging batteries is characterized in that, offer a control circuit and carry out, so as to determining a charging cut-off current, so according to this charging cut-off current to a battery charge, this method comprises:
Utilize this control circuit to read a battery actual capacity parameter, the percentage after this battery actual capacity parameter represents a battery actual capacity or this battery actual capacity divided by a battery design capacity;
Utilize this control circuit to read a preset rules, this preset rules defines a plurality of battery capacities interval, and those battery capacity intervals comprise the interval and one second battery capacity interval of one first battery capacity;
Utilize this control circuit to judge whether this battery actual capacity parameter falls within this first or second battery capacity interval;
When this control circuit judges that this battery actual capacity parameter falls within this first battery capacity interval, charge cut-off current to this battery charge according to one first; And
When this control circuit judges that this battery actual capacity parameter falls within this second battery capacity interval, charge cut-off current to this battery charge according to one second;
Wherein this first and second battery capacity is interval different, and this first charging cut-off current is less than this second charging cut-off current.
2. method for charging batteries as claimed in claim 1 is characterized in that, this a plurality of battery capacities interval more comprises one the 3rd battery capacity interval, and this method further comprises the following step:
Utilize this control circuit to judge whether this battery actual capacity parameter falls within the 3rd battery capacity interval; And
When this control circuit judges that this battery actual capacity parameter falls within the 3rd battery capacity interval, charge cut-off current to this battery charge according to one the 3rd;
Wherein this first, second all different with the 3rd battery capacity interval, and this first the charging cut-off current less than this second the charging cut-off current, this second the charging cut-off current less than the 3rd the charging cut-off current.
3. method for charging batteries offers a control circuit and carries out, it is characterized in that, so as to determining a charging cut-ff voltage, so according to this charging cut-ff voltage to a battery charge, this method comprises:
Utilize this control circuit to write down an actual standby time of this battery;
Utilize this control circuit to read a preset rules, this preset rules defines between a plurality of battery lay-up periods, comprises between those battery lay-up periods to reach between one second battery lay-up period between one first battery lay-up period;
Utilize this control circuit to judge and whether fall within this actual standby time between this first or second battery lay-up period;
When this control circuit is judged when falling within this actual standby time between this first battery lay-up period, according to one first charging cut-ff voltage to this battery charge; And
When this control circuit judges that this battery actual capacity falls between this second battery lay-up period, charge cut-ff voltage to this battery charge according to one second;
Wherein different between this first and second lay-up period, and this first charging cut-ff voltage is greater than this second charging cut-ff voltage.
4. method for charging batteries as claimed in claim 3 is characterized in that, this first charging cut-ff voltage essence is fixed, this second charging cut-ff voltage change.
5. method for charging batteries as claimed in claim 3 is characterized in that, more comprise between one the 3rd battery lay-up period between these a plurality of battery lay-up periods, and this method further comprises the following step:
Whether utilize this control circuit to judge falls between the 3rd battery lay-up period this actual standby time; And
When this control circuit judges that this battery actual capacity falls between the 3rd battery lay-up period, charge cut-ff voltage to this battery charge according to one the 3rd;
Wherein this first, second with the 3rd lay-up period between all different, and this first the charging cut-ff voltage greater than this second the charging cut-ff voltage, this second the charging cut-ff voltage greater than the 3rd the charging cut-ff voltage.
6. method for charging batteries offers a control circuit and carries out, it is characterized in that, so as to determining a charging cut-ff voltage, so according to this charging cut-ff voltage to a battery charge, this method comprises:
Utilize this control circuit to read a battery remaining power parameter, the percentage after this battery remaining power parameter represents a battery remaining power or this battery remaining power divided by a battery actual capacity;
Utilize this control circuit to read a preset rules, this preset rules defines a plurality of battery remaining powers interval, and those battery remaining power intervals comprise the interval and one second residual capacity interval of one first residual capacity;
Utilize this control circuit to judge whether this battery remaining power parameter falls within this first or second residual capacity interval;
When this control circuit judges that this battery remaining power parameter falls within this first residual capacity interval, charge cut-ff voltage to this battery charge according to one first; And
When this control circuit judges that this battery remaining power parameter falls within this second residual capacity interval, charge cut-ff voltage to this battery charge according to one second;
Wherein this first and second residual capacity is interval different, and this first and second charging cut-ff voltage difference.
7. method for charging batteries as claimed in claim 6 is characterized in that, this a plurality of battery remaining powers interval more comprises during one the 3rd residual capacity, and this method further comprises the following step:
Utilize this control circuit to judge whether this battery remaining power parameter falls within during the 3rd residual capacity; And
When this control circuit judges that this battery remaining power parameter falls within the 3rd residual capacity interval, charge cut-ff voltage to this battery charge according to one the 3rd;
Wherein this first, second all different with the 3rd residual capacity interval, and this first, second with the 3rd charging cut-ff voltage in the two is different at least.
8. a method for charging batteries is characterized in that, offer a control circuit and carry out, so as to determining a charging cut-ff voltage, so according to this charging cut-ff voltage to a battery charge, this method comprises:
Utilize this control circuit to read a battery status parameter, this battery status parameter comprise an actual standby time and a battery remaining power parameter at least one of them;
Utilize this control circuit to read a preset rules, this preset rules defines a plurality of battery statuss interval, this a plurality of battery statuss interval refers between a plurality of battery lay-up periods and/or a plurality of battery remaining powers interval, this a plurality of battery statuss interval comprise between one first state area and one second state area between;
Utilize this control circuit to judge whether this battery status parameter falls between this first or second state area;
When this control circuit judges that this battery status parameter falls between this first state area, charge cut-ff voltage to this battery charge according to one first; And
When this control circuit judges that this battery status parameter falls between this second state area, charge cut-ff voltage to this battery charge according to one second;
Wherein different between this first and second state area, and this first and second charging cut-ff voltage difference.
9. method for charging batteries as claimed in claim 8 is characterized in that, this a plurality of battery statuss interval more comprises a third state interval, and this method further comprises the following step:
Utilize this control circuit to judge whether this battery status parameter falls within this third state interval; And
When this control circuit judges that this battery status parameter falls within this third state interval, charge cut-ff voltage to this battery charge according to one the 3rd;
Wherein this first, second all different with third state interval, and this first, second with the 3rd charging cut-ff voltage in the two is different at least.
CN201010111742.3A 2010-02-09 2010-02-09 Method for charging battery CN102148410B (en)

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US9184607B2 (en) 2013-03-08 2015-11-10 Asustek Computer Inc. Battery module and overcharge protecting method thereof
WO2015196641A1 (en) * 2014-06-23 2015-12-30 中兴通讯股份有限公司 Battery charging method and device, and computer storage medium
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