CN101938150A - Charge control method, battery charge controller and Battery pack - Google Patents
Charge control method, battery charge controller and Battery pack Download PDFInfo
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- CN101938150A CN101938150A CN2010102196827A CN201010219682A CN101938150A CN 101938150 A CN101938150 A CN 101938150A CN 2010102196827 A CN2010102196827 A CN 2010102196827A CN 201010219682 A CN201010219682 A CN 201010219682A CN 101938150 A CN101938150 A CN 101938150A
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Abstract
The invention provides a kind of charge control method that can improve the charge characteristic repeatedly (cycle life) of secondary cell.Wherein, under the charging voltage of predefined maximum, with predefined current value secondary cell is carried out constant current charge during the charging beginning, and when the cell voltage whenever the described secondary cell that is accompanied by charging reaches predefined charging current switched voltage, when minimizing is charged to this secondary cell to the charging current of described secondary cell, reduce the charging voltage and/or the described charging current switched voltage of described maximum according to the charge and discharge cycles number of times of described secondary cell.
Description
Technical field
The present invention relates to improve charge control method, battery charge controller and the Battery pack of the charge characteristic repeatedly (cycle life) of secondary cell.
Background technology
When secondary cell is charged, under the charging voltage of predefined maximum, this secondary cell is carried out constant current charge, till battery (cell) voltage of secondary cell rises to setting voltage, with above-mentioned setting voltage secondary cell is carried out constant voltage charge then, this method is known as the constant voltage constant current charging method.Propose this moment: carry out described constant voltage charge setting voltage afterwards by slowly reducing according to the number of occurrence (cycle-index) that discharges and recharges, prevent the deterioration of secondary cell, increase the essence charging capacity of secondary cell, and prolong this battery life (for example, referring to Patent Document 1).
In addition, following method is proposed: at first before the present inventor etc., detect the cell voltage of the secondary cell in the charging, when cell voltage reaches predefined voltage, by reducing the charging voltage of described secondary cell or reduce the charging current of secondary cell, thereby under the situation that does not reduce battery performance, secondary cell is carried out the suitableeest charging.(for example, referring to Patent Document 2)
[patent documentation 1] TOHKEMY 2008-5644 communique
[patent documentation 2] TOHKEMY 2009-44946 communique
; in the experimental study that present inventor etc. carries out, find; for example just reduce setting voltage after constant current charge switches to constant voltage charge according to (cycle-index) repeatedly that discharge and recharge; perhaps when reaching setting voltage, reduce charging current, can't not only give full play to the performance of secondary cell but also seek its long lifetime secondary cell.
Summary of the invention
The present invention has considered above-mentioned situation, it is a kind of under the situation of repeatedly secondary cell being charged, under the situation that just even the charge and discharge cycles number of times increases even its purpose is to provide, also can fully charge, seek the charge control method and the battery charge controller of the raising of its cycle characteristics (battery life) secondary cell.
Simultaneously, other purposes of the present invention are to provide a kind of Battery pack that above-mentioned battery charge controller is arranged that possesses.
In order to reach above-mentioned purpose, charge control method involved in the present invention is characterized in that, under the charging voltage of predefined maximum, when the charging beginning, secondary cell is carried out constant current charge with predefined current value, and whenever the cell voltage of the described secondary cell that is accompanied by charging reaches predefined charging current switched voltage, the current value that reduces above-mentioned constant current charge charges this secondary cell charge to full, it is characterized in that
Be accompanied by discharging and recharging repeatedly in the described secondary cell, reduce the charging voltage and/or the described charging current switched voltage of described maximum.
Subsidiary one carries, preferably, the charge and discharge cycles number of times that is used as described secondary cell repeatedly that discharges and recharges in the described secondary cell is obtained, and the minimizing of the charging voltage of described maximum and/or described charging current switched voltage is carried out according to above-mentioned charge and discharge cycles number of times.At this moment, preferred, also follow discharge and recharge repeatedly, charge and discharge cycles number of times particularly, reduce charge protection voltage threshold to described secondary cell.
Preferably, described charging current switched voltage, the 2nd charging current switched voltage that is utilized after the 1st charging current switched voltage that is utilized during by the charging beginning and charging current reduce constitutes, and described the 1st charging current switched voltage is set lowlyer than described the 2nd charging current switched voltage.In addition, when the accumulation charging capacity of described secondary cell or accumulated discharge appearance capacity reach predefined charge volume or when 1 charging of described secondary cell reaches full charging or when the described secondary cell that is charged to full charging is discharged fully, all increase progressively described charge and discharge cycles number of times.
In addition, battery charge controller involved in the present invention is characterized in that, possesses:
Charging control section, the cell voltage and the predefined charging current switched voltage of this secondary cell when it compares by the charging of the secondary cell of constant current charge under the charging voltage of predefined maximum, when the cell voltage of described secondary cell reaches described charging current switched voltage, reduce charging current to described secondary cell;
Administrative unit, it manages based on the cell voltage of described secondary cell or the charging and discharging currents charge and discharge cycles number of times to this secondary cell; With
Charge condition change unit before its charging at described secondary cell begins, according to the charge and discharge cycles number of times of being obtained by described administrative unit, reduces charging voltage and/or described charging current switched voltage to the maximum of described secondary cell.
Then, Battery pack involved in the present invention is characterized in that possessing the battery charge controller of above-mentioned formation.
[invention effect]
According to the present invention as can be known, since according to discharge and recharge repeatedly, particularly reduce charging voltage and/or charging current switched voltage to the maximum of described secondary cell according to the charge and discharge cycles number of times, so for being accompanied by the battery behavior repeatedly that the discharges and recharges secondary cell of deterioration, the harmful effect that can avoid charging current to cause can improve its cycle life.
In addition; because according to the charging voltage of charge and discharge cycles number of times reduction to the maximum of described secondary cell; so for the battery behavior repeatedly that is accompanied by charge and discharge cycles gradually deterioration secondary cell, additives for overcharge protection is moved reliably, can improve its fail safe.
Description of drawings
Fig. 1 be the related Battery pack of an embodiment of the invention want portion's summary pie graph.
Fig. 2 is the figure of the notion of the related charge control method of expression an embodiment of the invention.
Fig. 3 is the figure of expression to the mode of the charging control of secondary cell.
Fig. 4 is the figure of expression by an example of the performed charging control sequence of the related battery charge controller of an embodiment of the invention.
Among the figure:
The 10-Battery pack, 11-secondary cell, 12-control part (MPU), 13-switch element (FET), the 14-current detecting part, 15-controls operational part, 16-voltage detection department, 17-communication process portion, the 18-detector unit, 20-load equipment (PC), the 21-load, 22-controls power supply unit.
Embodiment
Below, with reference to accompanying drawing the related charge control method of an embodiment of the invention, battery charge controller and Battery pack are described.
Fig. 1 is the figure that wants portion's summary formation of expression Battery pack involved in the present invention, and wherein 10 is Battery packs, the 20th, can load and unload the load equipment of personal computer (PC) that described Battery pack 10 freely is installed or portable terminal etc.Battery pack 10 possesses secondary cell (BAT) 11, controls the control part that discharges and recharges of this secondary cell 11 (microprocessor: MPU) 12 and constitute, and be installed on load equipment 20 and used basically.
Specifically, secondary cell 11 in the described Battery pack 10, for example the battery by following so-called 3 strings 2 and type constitutes, i.e. 22 a plurality of battery units that are connected in parallel and constitute, and 3 grades of these battery units that are connected in parallel that are connected in series by the lithium ion battery about 2600mAh/ unit (cell).In addition, though here to 3 strings 2 and the secondary cell 11 of type for example is illustrated, the be connected in parallel number and the progression that is connected in series of battery unit need only and determine according to rated output voltage that is provided as the battery specification and output-current rating capacity.
Next, charging and discharging in the circuit of this secondary cell 11, series connection is fitted with it is discharged and recharged the switch elements of controlling such as FET 13, and series connection is fitted with the current detecting part 14 that charging and discharging currents is detected.In addition, control part (MPU) 12 in the described Battery pack 10, possess as based on its main part be the control operational part 15 of the charging control unit of so-called microcomputer, respectively to the terminal voltage of described secondary cell 11, the voltage detection department 16 that particularly respectively the terminal voltage (cell voltage) of battery unit at different levels is detected, and and described load equipment 20 between carry out the communication process portion 17 of information communication and constitute.
Subsidiary one carries, described control operational part 15 is born following responsibility: the temperature (battery temperature) of the described secondary cell 11 that is detected according to the temperature detection battery 18 by thermistor etc., the cell voltage that is detected by described voltage detection department 16, and the charging and discharging currents that detected by described current detecting part 14, come described switch element 13 is connected disconnection control, and give control command via communication process portion 17 to described load equipment 20 sides, control is to the charging voltage or the charging current of described secondary cell 11.
In addition, described load equipment 20 possesses control power supply unit 22 basically and constitutes, and it is (not shown that wherein said control power supply unit 22 receives external power; Source power supply) back is that load 21 drives to the main part of this load equipment 20, and provides electric power to come described secondary cell 11 is charged to described Battery pack 10.In addition, control power supply unit 22 is born following responsibility: for example, when having broken off the external power supply, the electric power that provides with the secondary cell 11 by described Battery pack 10 drives described load 21.Charging about the secondary cell 11 that undertaken by described control power supply unit 22, at this secondary cell 11 is under the situation of lithium ion battery, by regulation respectively carry out as the maximum current (being generally about 0.5～1C) all introduced in the patent documentation 1,2 and the constant-current constant-voltage charging of maximum voltage (being generally about the 4.2V/ unit).
In addition, control power supply unit 22 possesses following function: and the communication process portion 17 of described Battery pack 10 between, for example carry out information communication in the SMBUS mode via data wire SDA and clock line SCI.The control part of described Battery pack 10 (MPU) 12 utilizes above-mentioned info-communication function to control the work of described control power supply unit 22, and charging voltage and charging current based on the described secondary cell 11 of this control power supply unit 22 are carried out variable setting.By the control of this control power supply unit 22, as described later, control is to the charging of secondary cell 11.
Here, the charging control to the secondary cell 11 that undertaken by described control part (MPU) 12 describes.In addition, described control part 12 not only possesses the charging controlled function to secondary cell 11, also possesses the various functions of the safety operating that relates to Battery pack 10 of the discharge controlled function or the failure exception function for monitoring of secondary cell 11, the function for monitoring that reaches the residual capacity that charges, performance (life-span) decision-making function etc.But, about these functions, owing to do not have direct relation with charging control as the secondary cell 11 of purport of the present invention, so omit its explanation at this.
Charging control involved in the present invention; in Fig. 2, schematically illustrate its notion; it is characterized in that; for example by the charging voltage Va of the maximum that puts on secondary cell 11, be used to control charging current switched voltage Vb, and judge under 3 Control Parameter that secondary cell 11 unusual protection voltage Vc constitute and carry out the charging current of the maximum of secondary cell 11; especially change above-mentioned Control Parameter according to charge and discharge cycles number of times (cycle count); even thereby under the situation about recharging of secondary cell 11 repeatedly, also can charge effectively to this secondary cell 11.
Subsidiary one carries, about above-mentioned charge and discharge cycles, for example be conceived to the charging of secondary cell 11, with this secondary cell 11 when using beginning initial condition or discharge into the state of the capacity of recharging from secondary cell 11, be 1 circulation until the procedure definition that is charged to fully charged state.In addition, also can be used as the product value in charging current value and its charging interval and obtain the charging capacity of secondary cell 11, when this charging capacity reaches the full charge capacity value of this secondary cell 11, this is obtained as 1 circulation.In addition, under the situation of the discharge that is conceived to secondary cell 11, for example also can be accompanied by its discharge and discharge into predefined capacity when above or when discharging fully, this is obtained as 1 circulation at the secondary cell 11 that is charged to full charging.Carried out the secondary cell 11 of 1 circulation discharge owing to can be charged once more, so mean that this discharge cycles is also same with aforesaid charging cycle.Therefore, the charge and discharge cycles number of times of obtaining as charging cycle or discharge cycles (cycle count) means and recharges number of times repeatedly as secondary cell 11.The management of such charge and discharge cycles number is that the management of charging and discharging program (administrative unit) in aforesaid control operational part 15 is carried out down.
Next, charging in 1 cycle period of secondary cell 11, as the situation of the charging current I of the situation of the variation of the cell voltage Vcell that is accompanied by charging in contrast among Fig. 3 and change control is represented, basically, compare the cell voltage Vcell and the described charging current switched voltage Vb that in the charging of secondary cell 11, are detected, when this cell voltage Vcell reaches described charging current switched voltage Vb, carry out the control that reduces the charging current I of described secondary cell 11 repeatedly, reach full charging up to this secondary cell 11.In addition, the minimizing of charging current I control is that the minimum charge current value that will pre-determine out is carried out as boundary (minimizing boundary).Then, when the full charging that detects secondary cell 11, stop this charging, meanwhile forbid further charging (overcharging).
In addition, be set with as described charging current switched voltage Vb here: the charging of described secondary cell 11 be used for when beginning initial charging current I switching controls the 1st charging current switched voltage Vb1 and be used for the 2nd charging current switched voltage Vb2 of the switching controls of the 2nd later charging current I.Then, under the situation of this execution mode, at first when the described cell voltage Vcell of the charging that is accompanied by described secondary cell 11 reaches described the 1st charging current switched voltage Vb1, as described above, reduce charging current I, the charging current switched voltage Vb that will be used for charging control thereafter changes to described the 2nd charging current switched voltage Vb2.
Subsidiary one carries, at described secondary cell 11 is under the situation of lithium ion battery, for example described the 1st charging current switched voltage Vb1 is defined as 4.10V/cell, in addition described the 2nd charging current switched voltage Vb2 is defined as 4.20V/cell, it is lower than the 2nd charging current switched voltage Vb2 to allow the 1st charging current switched voltage Vb1 be defined as.As the 1st and the 2nd charging current switched voltage Vb1, the Vb2 that set thus, consider owing to the charging capacity of secondary cell 11 when charging begins itself is less, cell voltage is so not high with regard to its charge volume, changes well according to its charge volume cell voltage response when secondary cell 11 is charged to a certain degree in addition.In addition, about being used for the charging current switched voltage that charging current I switches, also can be set at 3 grades or 4 grades.At this moment, according to its switching condition, as long as in advance described charging current switched voltage is set at Vb3, Vb4 etc.
As above-mentioned, if control charging current I makes secondary cell 11 be charged to full charging, then in the present embodiment, the cycle count N that represents aforesaid charging cycle number of times is increased progressively (+1), in order to recharge (administrative unit) after secondary cell 11 discharges.Then; under the situation that secondary cell 11 is recharged; as described later; change charging voltage Va, charging current switched voltage Vb (Vb1, Vb2) and the protection voltage Vc of aforesaid maximum respectively according to above-mentioned cycle count N; under these Control Parameter after changing, carry out the charging control of aforesaid secondary cell 11.
In addition, the change of Control Parameter (maximum charging voltage Va, charging current switched voltage Vb and protection voltage Vc) for example surpasses under the situation of " 4 " at described cycle count N and implements.In other words, when the use of battery pack 10 begins, even if owing to the battery behavior that recharges this secondary cell 11 repeatedly by secondary cell 11 also less changes, so not necessarily carry out the change of Control Parameter.Then, recharging repeatedly of reason secondary cell 11, when the battery behavior of this secondary cell 11 begins slowly deterioration, particularly repeatedly more than 4 times after the charging of secondary cell 11, battery performance is gradually during deterioration, as above-mentioned, according to the charge change of Control Parameter of the deterioration of this battery behavior.
Charging control promptly, involved in the present invention is characterized in that, basically as above-mentioned under predefined maximum charging voltage Va, when interim on one side its charging current of minimizing of execution I makes secondary cell 11 be charged to the processing of full charging on one side repeatedly, count its charge and discharge cycles number of times, the charging Control Parameter of upgrading aforesaid secondary cell 11 according to cycle count N is maximum charging voltage Va and/or charging current switched voltage Vb.Especially, be characterised in that, (for example surpass setting at cycle count N, 4) time, particularly by reduce charging current switched voltage (Control Parameter) Vb of maximum charging voltage Va and the aforesaid control that is used to charge one by one with the regulation ratio, be accompanied by charge and discharge cycles described repeatedly secondary cell 11 performance (battery behavior) gradually deterioration situation under, also can irrespectively charge effectively with its cycle-index to secondary cell 11.
More particularly, above-mentioned charging control example is as carrying out according to step shown in Figure 4.This example is represented 22 of 6 lithium ion batteries (battery unit) are connected in parallel, and with the charging control example of the secondary cell 11 of its 3 grades of formation that are connected in series.At this moment; make following initial setting at first respectively: as charging Control Parameter to above-mentioned secondary cell 11; cycle count N is made as " 0 "; the charging voltage Va of maximum is made as 12.6V (3 * 4.20V/cell); charging current switched voltage Vb (the 1st current switching voltage Vb1) is made as 4.10V/cell; the 2nd charging current switched voltage Vb2 is set at 4.20V/cell, will protects voltage Vc to be set at 4.25V/cell (step S1) then.
Then, judge the charging (step S2) that whether begins secondary cell 11, under the situation that begins to charge, at first described cycle count N is increased progressively (+1) (step S3).Then, for example judge whether the cycle count N after increasing progressively is " 4 " following (step S4), surpass under the situation of " 4 " at cycle count N, after having changed aforesaid charging Control Parameter Va, Vb, Vc respectively (step S5), travel to the charging control that begins from step S6.In addition, under cycle count N is situation below " 4 ", directly utilize charging Control Parameter Va, Vb (Vb1, Vb2), Vc behind initial setting, travel to the charging control that begins from step S6.In addition, also managing except the charging cycle number under the situation of discharge cycles number, according to the above-mentioned processing of the same execution of its cycle count N, this is self-evident.
Processing shown in these steps S2～S5 is the setting treatment step of the Control Parameter utilized of the charging control to the secondary cell 11 shown in after the step S6, carries out according to cycle count N as above-mentioned.Then, under cycle count N surpasses the situation of " 4 ", for example, reduce [2 * 3 * (N-4)] mV to the charging voltage Va of the maximum that is initially set 12.6V as described above.In addition, [2 * 3] expression in the above-mentioned formula:, each circulation of its charging voltage is reduced 2mV/cell one by one at 3 grades of battery units that are connected in series.Specifically, under the situation that is the 10th circulation, the charging voltage Va minimizing 36mV with maximum is set at 12.56V.
In addition, about charging current switched voltage Vb and protection voltage Vc, for example reduce [2 * (N-4)] mV/cell.In addition, [2] of following formula expression: each circulation of charging voltage is reduced 2mV/cell one by one.Specifically; under the situation that is the 10th circulation; charging current switched voltage Vb and protection voltage Vc are reduced 12mV/cell respectively; the 1st charging current switched voltage Vb1 that is initially set 4.10V/cell is changed to 4.088V/cell; the 2nd charging current switched voltage Vb2 that is initially set 4.20V/cell is changed to 4.188V/cell, and the protection voltage Vc that will be initially set 4.25V/cell in addition changes to 4.238V/cell.Wherein, about charging current switched voltage Vb and the pairing minimizing value of protection voltage Vc, consider the characteristic of secondary cell (battery unit), for example maximum is made as 50mV/cell.Therefore; in this example; after the 29th circulation; charging voltage Va, the charging current switched voltage Vb of maximum and the minimizing of protection voltage Vc are applied restriction; maximum charging voltage Va is set in 12.45V by predetermined fixed; charging current switched voltage Vb1, Vb2 are set in 4.05V/cell, 4.15V/cell by predetermined fixed, protect voltage Vc to be set in 4.20V/cell by predetermined fixed then.In addition, about the 1st charging current switched voltage Vb1, but also predetermined fixed is set in 4.10V/cell.
Next, as above-mentioned, count N setting Control Parameter according to charge and discharge cycles after, utilized the charging control of the secondary cell 11 of these Control Parameter.The charging of this secondary cell 11 for example begins the initial value of charging current I after as 4.1A, judges at first whether its charging current I is initial value, promptly judges whether be charging current I electric current (step S6) before changing.Then, under the situation that is charging current I electric current before changing, utilize described the 1st charging current switched voltage Vb1 to carry out the judgement (step S7) of cell voltage Vcell, in addition, changed at charging current I under the situation of initial value, utilized aforesaid the 2nd charging current switched voltage Vb2 to carry out the judgement (step S8) of cell voltage Vcell.About being used for the cell voltage Vcell of this judgement, preferably voltage maximum in the cell voltage of 3 grades of each battery units that is connected in series is represented as it.
Then, do not meet at cell voltage Vcell under the situation of the 1st or the 2nd charging current switched voltage Vb1, Vb2, directly continue under above-mentioned charging current I, to charge, surpassed the 1st or the 2nd charging current switched voltage Vb1 at cell voltage Vcell, under the situation of Vb2, reduce aforesaid charging current I (step S9).The minimizing of this charging current I, for example 10% charging current I carries out by reducing.Specifically, for example obtain the mean charging current of this moment, set the new charging current I that obtains behind 0.9 times of this mean charging current, under charging current I after changing, continue charging secondary cell 11.Wherein, about charging current I, preferably limited according to the mode that is not less than 0.02C (in this example, being 112mA).
Proceed the charging of the secondary cell 11 that under the minimizing of such charging current I control, carried out, till secondary cell 11 reaches full charging (step S10).Then, reached at secondary cell 11 under the situation of fully charged state, finished as charging and stop charging process (step S11).Specifically, begun at charging current I under the situation of charging of secondary cell 11 with 4.1A, at first, cell voltage Vcell and aforesaid the 1st charging current switched voltage Vb1 in the charging are compared, and when cell voltage Vcell had surpassed the 1st charging current switched voltage Vb1, I changed to 3.69A with charging current.Then, with the described secondary cell 11 of charging current I continuation charging after changing, this compares described cell voltage Vcell and aforesaid the 2nd charging current switched voltage Vb2.Then, when cell voltage Vcell reaches the 2nd charging current switched voltage Vb2, with described charging current I be reduced to successively 3.32A, 2.99A, 2.69A, 2.42A ...Then, when secondary cell 11 has reached full charging, stop its charging.
So; according to controlling as above-mentioned performed charging; owing to change charge condition to this secondary cell 11 according to the charge and discharge cycles times N of secondary cell 11; so; especially the charge and discharge cycles number surpasses under 5 times the situation in this example; because reduced the promptly maximum charging voltage Va of this charging Control Parameter respectively; charging current switched voltage Vb and protection voltage Vc; even discharge and recharge repeatedly thereby be accompanied by; the performance of secondary cell 11 (battery behavior) is deterioration gradually, also can irrespectively effectively and safely charge to secondary cell 11 with this deterioration in characteristics.
Especially; according to the present invention; when cell voltage Vcell reaches charging current switched voltage Vb; when can obtain embodying, can also suitably set its Control Parameter (charging voltage Va, charging current switched voltage Vb and protection voltage Vc) according to the number of occurrence of charge and discharge cycles while the feature that reduces the charging control that its charging current I continues to charge.Therefore, can play the effect of the charge efficiency etc. of the secondary cell 11 that can improve in each charge and discharge cycles.
In addition, according to the present invention, owing to the charging Control Parameter that changes according to the degradation that is accompanied by the battery behavior that brings repeatedly that discharges and recharges secondary cell 11, so there is not the problem that for example secondary cell 11 of characteristic deterioration has been applied superfluous charging voltage Va.Therefore,, the battery performance that secondary cell 11 has can be brought into play to greatest extent, its long lifetime can also be sought self not applying under the situation of load of transition to secondary cell 11.
In addition, the present invention is not limited to above-mentioned execution mode.For example, handle, can adopt the whole bag of tricks that in the past proposed about the detection of full charging.In addition, about charge and discharge cycles, for example also can accumulate and be managed the charging capacity of the secondary cell 11 that intermittently discharges and recharges.Specifically, be under the situation of secondary cell of 1700mAh at intrinsic capacity, for example intermittently be charged as for the first time 500mAh, intermittently be charged as for the second time under the situation of 300mAh etc., can accumulate its charging capacity, when its accumulated value reached 1700mAh, the charging that is detected. as 1 circulation was finished.At this moment, go through repeatedly secondary cell 11 is charged during, can discharge to secondary cell 11 certainly, also can make secondary cell 11 be in full charging back in addition certainly and suspend this charging.
In addition, replace above-mentioned charge volume, also can be conceived to the discharge capacity of secondary cell 11, and charge and discharge cycles is counted.At this moment, the discharge capacity of the secondary cell 11 of accumulation (adding up) repeated charge is when this accumulated value (accumulated value) reaches the intrinsic capacity of secondary cell 1, as long as it is counted as 1 circulation.In this case, secondary cell 11 is charged in halfway certainly.
In addition; in aforesaid execution mode; though changed the Control Parameter (maximum charging voltage Va, charging current switched voltage Vb and protection voltage Vc) that is used to charge and controls according to charge and discharge cycles number (cycle count); but because for example be accompanied by discharge and recharge repeatedly and battery performance deterioration gradually; discharge and recharge repeatedly so also can infer according to the degradation of battery performance on the contrary, perhaps the degradation according to battery performance changes described Control Parameter (maximum charging voltage Va, charging current switched voltage Vb and protection voltage Vc).
For example, can be to carrying out timing the service time of the employed Battery pack that charges repeatedly, and judge the degree of the deterioration in characteristics of (inferring) secondary cell 11.Specifically, utilize the real-time clock (timer) that is installed on Battery pack, from its service time of the use supervision zero hour of Battery pack.Then, the running time that timing discharges and recharges secondary cell 11 (charging interval+discharge time), and timing makes discharging and recharging of secondary cell 11 stand-by time that stop, so-called.Then; the above-mentioned stand-by time real work equivalent time of obtaining after the predetermined coefficients that multiplies each other is added on described running time; obtain the service time of secondary cell 11; and should estimate as the impairment grade of battery performance service time, also can change aforesaid Control Parameter (maximum charging voltage Va, charging current switched voltage Vb and protection voltage Vc) according to impairment grade.In addition; also can be conceived to be accompanied by secondary cell discharge and recharge repeatedly and its internal resistance increases gradually; detect its internal resistance; infer the degree of deterioration of battery performance of secondary cell 11 or the number of occurrence (charge and discharge cycles) that discharges and recharges, upgrade aforesaid charging Control Parameter (maximum charging voltage Va, charging current switched voltage Vb and protection voltage Vc).Generally speaking, as long as be accompanied by the secondary cell repeated charge is slowly changed this charging Control Parameter of control as described above.
In addition, though can be as shown in Figure 1, battery charge controller involved in the present invention is realized as with secondary cell 11 integral types the Battery pack that forms being installed, but also can be realized as the charger of the special use that is used for the secondary cell for the treatment of as monomer is charged.In addition, also can realize as the battery charge controller that is installed on the terminal equipment 20 that uses secondary cell.In addition, the present invention can carry out various distortion and be implemented in the scope that does not break away from its aim.
Claims (12)
1. charge control method, under the charging voltage of predefined maximum, when the charging beginning, secondary cell is carried out constant current charge with predefined current value, and whenever the cell voltage of the described secondary cell that is accompanied by charging reaches predefined charging current switched voltage, the current value that reduces above-mentioned constant current charge charges this secondary cell charge to full, it is characterized in that
Be accompanied by discharging and recharging repeatedly in the described secondary cell, reduce the charging voltage and/or the described charging current switched voltage of described maximum.
2. charge control method according to claim 1 is characterized in that,
Also be accompanied by discharging and recharging repeatedly in the described secondary cell, reduce charge protection voltage threshold described secondary cell.
3. charge control method according to claim 1 is characterized in that,
The charge and discharge cycles number of times that is used as described secondary cell repeatedly that discharges and recharges in the described secondary cell is obtained, and the minimizing of the charging voltage of described maximum and/or described charging current switched voltage is carried out according to above-mentioned charge and discharge cycles number of times.
4. charge control method according to claim 1 is characterized in that,
Described charging current switched voltage, the 2nd charging current switched voltage that is utilized after the 1st charging current switched voltage that is utilized during by the charging beginning and charging current reduce constitutes, and described the 1st charging current switched voltage is set lowlyer than described the 2nd charging current switched voltage.
5. charge control method according to claim 3 is characterized in that,
When the accumulation charging capacity of described secondary cell or accumulated discharge appearance capacity reach predefined charge volume or when 1 charging of described secondary cell reaches full charging or when the described secondary cell that is charged to full charging is discharged fully, all increase progressively described charge and discharge cycles number of times.
6. battery charge controller is characterized in that possessing:
Charging control section, the cell voltage and the predefined charging current switched voltage of this secondary cell when it compares by the charging of the secondary cell of constant current charge under the charging voltage of predefined maximum, when the cell voltage of described secondary cell reaches described charging current switched voltage, reduce charging current to described secondary cell;
Administrative unit, it manages based on the cell voltage of described secondary cell or the charging and discharging currents charge and discharge cycles number of times to this secondary cell; With
Charge condition change unit before its charging at described secondary cell begins, according to the charge and discharge cycles number of times of being obtained by described administrative unit, reduces charging voltage and/or described charging current switched voltage to the maximum of described secondary cell.
7. battery charge controller according to claim 6 is characterized in that,
Described charging current switched voltage, be used for the 1st charging current switched voltage that the cell voltage with secondary cell compares and reduced by described charging control section being used for the 2nd charging current switched voltage that the cell voltage with described secondary cell compares after the charging current and constituting by when beginning charging, described the 1st charging current switched voltage is set lowlyer than described the 2nd charging current switched voltage.
8. battery charge controller according to claim 6 is characterized in that,
When the accumulation charging capacity of this secondary cell of obtaining based on the cell voltage or the charging current of described secondary cell reaches predefined charge volume or when 1 time of described secondary cell charging reaches full charging or when the described secondary cell that is charged to full charging was discharged fully, described administrative unit increased progressively the charge and discharge cycles number of times of this secondary cell.
9. battery charge controller according to claim 6 is characterized in that,
Described charge condition change unit also reduces charge protection voltage threshold to described secondary cell based on described charge and discharge cycles number of times.
10. Battery pack is characterized in that possessing:
Secondary cell; With
Any described battery charge controller in the claim 6～9.
11. charge control method, under the charging voltage of predefined maximum, when the charging beginning, secondary cell is carried out constant current charge with predefined current value, and when the cell voltage of the described secondary cell that is accompanied by charging reaches predefined charging current switched voltage, the current value that reduces above-mentioned constant current charge comes this secondary cell is charged, it is characterized in that
The 2nd charging current switched voltage that is utilized after the 1st charging current switched voltage that described charging current switched voltage is utilized when being begun by charging and charging current reduce constitutes, and described the 1st charging current switched voltage is set lowlyer than described the 2nd charging current switched voltage.
12. a battery charge controller is characterized in that,
Possesses charging control section, this charging control section is the cell voltage and the predefined charging current switched voltage of this secondary cell during by the charging of the secondary cell of constant current charge under the charging voltage of predefined maximum relatively, when the cell voltage of described secondary cell reaches described charging current switched voltage, minimizing is to the charging current of described secondary cell
Described charging current switched voltage is used for the 1st charging current switched voltage that the cell voltage with secondary cell compares by when beginning charging and is reduced by described charging control section being used for the 2nd charging current switched voltage that the cell voltage with described secondary cell compares after the charging current and constituting, and described the 1st charging current switched voltage is set lowlyer than described the 2nd charging current switched voltage.
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| JP2009155275A JP2011015481A (en) | 2009-06-30 | 2009-06-30 | Charge control method, charge control device, and battery pack |
| JP2009-155275 | 2009-06-30 |
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| CN101938150A true CN101938150A (en) | 2011-01-05 |
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| CN2010102196827A Pending CN101938150A (en) | 2009-06-30 | 2010-06-29 | Charge control method, battery charge controller and Battery pack |
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