CN103178579A - Charging current determining method and battery pack - Google Patents
Charging current determining method and battery pack Download PDFInfo
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- CN103178579A CN103178579A CN2012105673189A CN201210567318A CN103178579A CN 103178579 A CN103178579 A CN 103178579A CN 2012105673189 A CN2012105673189 A CN 2012105673189A CN 201210567318 A CN201210567318 A CN 201210567318A CN 103178579 A CN103178579 A CN 103178579A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a charging current determining method and a battery pack. The charging current can be properly reduced according to the deterioration degree along with the use of a secondary battery. When the charging and discharging circulation times of the second battery increases one, the deterioration coefficient (initial value is one) expressing the deterioration degree along with the use of the secondary battery based on the value of the value times a first deterioration coefficient (0.9992) and times a second deterioration coefficient (0.99) corresponding to the deterioration degree during the storage of the second battery. In the step S55, the initial value of the charging current times the deterioration coefficient, thus the charging current of the secondary battery increases/decreases based on the value of the deterioration coefficient.
Description
Technical field
The present invention relates to be full of the determining method of the charging current in the battery pack of learning value of capacitance and the battery pack of carrying out this determining method according to the degradation correction that is accompanied by the use of secondary cell.
Background technology
In the charging of the secondary cell take lithium ion battery as representative, it is mainly the so-called constant-current constant-voltage charging mode of carrying out constant current charge, then carrying out constant voltage charge with setting voltage to set electric current before cell voltage reaches setting voltage.Namely, in when beginning charging, make the expression charging current with respect to the so-called C ratios constant of the ratio of the nominal capacity (DC=Design Capacity) of secondary cell, begin thus the charging based on constant current.At this moment, in order to prevent that secondary cell is in overvoltage because of excessive charging current, sometimes according to the voltage of the secondary cell in when beginning charging or residual capacity, battery temperature, the suitable C ratio the during change charging beginning table 1,2 of patent documentation 1 (for example with reference to).
In addition, repeatedly discharge and recharge (comprise in preservation oneself discharge) with secondary cell, cause being full of capacitance and compare with initial capacity to some extent and descend thereby secondary cell is deteriorated, thus therefore in fact the C ratio uprise and accelerated the deteriorated of secondary cell.Therefore, the preferred grasp reliably is full of the decline degree of capacitance or the degradation of secondary cell, reduces the setting electric current as the initial value of charging current.
At this, by accumulative total make be in the secondary cell that is full of electricity condition be discharged to discharge till end voltage during discharging current or accumulative total make voltage dropped to below the discharge end voltage secondary cell charge to be full of till electricity condition during a kind of wherein method of charging current, can correctly calculate and learn to be full of capacitance.Wherein, under the behaviour in service of the secondary cell of reality, because the chance of above-mentioned study is few, therefore the technology (with reference to patent documentation 2) that capacitance reduces to revise with the ratio of regulation according to the period that discharges and recharges that is full of of learning that makes is disclosed.In addition, disclose based on the variable quantity with respect to the charge/discharge capacity between above-mentioned 2 time points of the variable quantity of the residual capacity under any 2 time points (SOC:State Of Charge), learnt the technology that is full of capacitance (with reference to patent documentation 3) of secondary cell.
In addition, deteriorated the further developing in the situation that use secondary cell, the battery temperature when the internal resistance increase of secondary cell makes charging rises, and has further accelerated thus the deteriorated of secondary cell.On the other hand, disclose a kind of internal resistance that current change quantity when charging current is reduced and voltage variety are calculated secondary cell in charging process, and reduced according to the internal resistance of calculating the deteriorated technology (with reference to patent documentation 4) that charging current suppresses secondary cell thus.
Technical literature formerly
Patent documentation
Patent documentation 1:JP JP 2009-44946 communique
Patent documentation 2:JP JP 2002-236154 communique
Patent documentation 3:JP JP 2008-261669 communique
Patent documentation 4:JP Unexamined Patent 9-84277 communique
Summary of the invention
The problem that invention will solve
But, for the internal resistance of secondary cell, the period that discharges and recharges little during its change less, on the other hand, larger change can occur according to residual capacity and the temperature of secondary cell, therefore can't grasp reliably the degradation of secondary cell based on the increase of internal resistance.In addition, even if can be by the disclosed technology correction of patent documentation 2 be full of capacitance by what the disclosed technology of patent documentation 3 was learnt in good time, also only only limit to this, and do not provide the enlightenment of the charging current that suitably reduces secondary cell.
The present invention is in light of this situation and proposes, and the degradation of the use that its purpose is to provide a kind of basis to be accompanied by secondary cell suitably reduces method and the battery pack of charging current.
Be used for solving the technical scheme of problem
The determining method of the charging current that the present invention relates to, be used for the charging current that decision possesses the battery pack of secondary cell, it is characterized in that, the charging current of described secondary cell or charging power or discharging current or discharged power are added up, calculate charging capacity or discharge capacity, whether the charging capacity that judgement is calculated or discharge capacity be greater than being full of capacitance, whenever being judged to be when being full of capacitance, utilize 1st deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
the determining method of the charging current that the present invention relates to is characterised in that, during determining that the charging current of described secondary cell and discharging current are less than rated current, press voltage and the temperature of the described secondary cell of time Sequence Detection in during determined, determine the degradation speed of the speed that expression and the voltage that detects and temperature are accordingly deteriorated, determined degradation speed is added up, judge that whether aggregate-value is greater than setting, when being judged to be greater than setting, utilize 2nd deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
the determining method of the charging current that the present invention relates to, be used for the charging current that decision possesses the battery pack of secondary cell, it is characterized in that, during determining that the charging current of described secondary cell and discharging current are less than rated current, press voltage and the temperature of the described secondary cell of time Sequence Detection in during determined, determine the degradation speed of the speed that expression and the voltage that detects and temperature are accordingly deteriorated, determined degradation speed is added up, judge that whether aggregate-value is greater than setting, when being judged to be greater than setting, utilize 2nd deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
The determining method of the charging current that the present invention relates to, be used for to determine that the charging capacity that obtains based on the charging current of secondary cell or charging power or discharging current or discharged power are added up or discharge capacity learn to be full of the charging current of the battery pack of capacitance, it is characterized in that, calculate learn be full of capacitance with respect to the ratio of specified volume, according to the ratio of calculating large/littlely decide the charged electrical rheology of described secondary cell large/diminish.
The determining method of the charging current that the present invention relates to is characterised in that, judge whether described secondary cell is in to be full of electricity condition, be judged to be in be full of electricity condition after, utilize described the 1st deterioration factor or described the 2nd deterioration factor correction to be full of capacitance.
The battery pack that the present invention relates to possesses secondary cell, and described battery pack is characterised in that also to possess: charging current or charging power or discharging current or the discharged power of the described secondary cell of accumulative total, the unit of calculating charging capacity or discharge capacity; Whether the charging capacity that judgement is calculated or discharge capacity be greater than the unit that is full of capacitance; Be judged to be whenever this unit when being full of capacitance, utilize 1st deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
The battery pack that the present invention relates to possesses secondary cell, and described battery pack is characterised in that also to possess: determine the unit during the charging current of described secondary cell and discharging current are less than rated current; Press the voltage of the described secondary cell of time Sequence Detection and the unit of temperature in during this unit is determined; The voltage that detects according to this unit and temperature are determined the unit of the degradation speed of the speed that expression is deteriorated; The determined degradation speed in this unit is carried out the unit of accumulative total; Judge that aggregate-value that this unit adds up is whether greater than the unit of setting; When being judged to be greater than setting whenever this unit, utilize 2nd deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the unit of the charging current of described secondary cell.
The battery pack that the present invention relates to learns to be full of capacitance based on the charging capacity or the discharge capacity that the charging current of secondary cell or charging power or discharging current or discharged power are added up and obtain, and described battery pack is characterised in that to possess: calculate learn be full of capacitance with respect to the unit of the ratio of specified volume; The ratio of calculating according to this unit large/littlely decide the charged electrical rheology of described secondary cell large/unit that diminishes; Unit with the data that generate the charging current that determines.
In the present invention, whenever the charging capacity of secondary cell or discharge capacity become when being full of capacitance, utilize 1st deterioration factor corresponding with the deteriorated degree of secondary cell to revise charging current.
That is to say, whenever the charge and discharge cycles number of secondary cell increases at 1 o'clock, according to the deteriorated degree in 1 charge and discharge cycles and charging current is corrected to such an extent that diminish.
In the present invention, in during the charging current of secondary cell and discharging current are all less than rated current, cell voltage and battery temperature by time Sequence Detection secondary cell, during greater than setting, utilize 2nd deterioration factor corresponding with the deteriorated degree of secondary cell to revise charging current whenever the value that obtains adding up with the cell voltage that detects and the corresponding degradation speed of battery temperature.
That is to say, when the aggregate-value of the degradation speed that is added up in secondary cell neither charges between the storage life of also not discharging surpasses setting, according to the degradation corresponding with described setting and charging current is corrected to such an extent that diminish.
In the present invention, the charging capacity or the discharge capacity that obtain based on the charging current of secondary cell or charging power or discharging current or discharged power are added up learn to be full of capacitance, according to the learning value that is full of capacitance (learning capacity) with respect to the ratio of specified volume large/littlely decide the charged electrical rheology of secondary cell large/diminish.
That is to say, be accompanied by the use of secondary cell and learning capacity descends, the larger learning capacity of the degradation mode less with respect to the ratio of specified volume according to the use that is accompanied by secondary cell calculated, so the larger charging current of the deteriorated degree of secondary cell is determined littlely.
In the present invention, detect secondary cell be in be full of electricity condition after, utilize the 1st deterioration factor or the 2nd deterioration factor correction to be full of capacitance.
Thus, due to until secondary cell become and be full of the correction that is full of capacitance till electricity condition and be retained, if so utilize described the 1st deterioration factor or described the 2nd deterioration factor correction to be full of capacitance after judging followed by each, sometimes be changed and cause capacity (%) thereby sharply changed and become discontinuous because being full of capacitance, but can guarantee according to the present invention until the capacity of secondary cell (%) reaches the charging continuity that is full of till electricity.
The invention effect
According to the present invention, whenever the charge and discharge cycles of secondary cell increases by 1 or when secondary cell is saved specified time limit, according to separately degradation and charging current is corrected to such an extent that diminish.
Therefore, can suitably reduce charging current according to the degradation of the use that is accompanied by secondary cell.
Description of drawings
Fig. 1 means the block diagram of the configuration example of the battery pack that the present invention relates to.
Fig. 2 is the key diagram of method that the period of secondary cell is counted.
Fig. 3 is the chart of the degree list of the deteriorated speed between the storage life of illustration battery block.
Fig. 4 is the key diagram that the correction of the RSOC that is carried out when low-voltage detects is described.
Fig. 5 means the flow chart for the treatment of step of revising the CPU of deterioration factor according to the period of secondary cell.
Fig. 6 means that according to the secondary cell degradation in preservation revises the flow chart for the treatment of step of the CPU of deterioration factor.
Fig. 7 means the charging current of calculating secondary cell and sends the flow chart for the treatment of step of CPU of the data of charging current.
Symbol description:
1 secondary cell
10 battery pack
2 current detectors
The 4A/D converter section
5 control parts
51CPU
52ROM
53RAM
54 timers
71、72MOSFET
9 Department of Communication Forces
20 electric equipments
21 control power supply unit
Embodiment
Below, describe the present invention in detail based on the accompanying drawing that represents its execution mode.
Fig. 1 means the block diagram of the configuration example of the battery pack that the present invention relates to.In figure, symbol 10 is battery pack, and battery pack 10 is assemblied in the electric equipments 20 such as personal computer (PC), portable terminal device in mode removably.Battery pack 10 possesses according to battery block 11,12,13 order it is connected in series the secondary cell 1 that forms, this battery block 11,12, the 13rd, and according to the battery cell 111,112,113,121,122,123,131,132 that for example is made of lithium ion battery, 133 order, each 3 being connected in parallel forms.The negative pole of the positive pole of battery block 13 and battery block 11 becomes respectively positive terminal and the negative terminal of secondary cell 1.
The positive terminal side of secondary cell 1 discharge and recharge the path, insert the cutter 7 that the MOSFET71,72 by the P channel-type that cuts off respectively charging current and discharging current consists of.MOSFET71,72 drain electrode are connected in series relative to one another.MOSFET71,72 separately drain electrode and the source electrode between the diode that is connected in parallel be parasitic diode (body diode).MOSFET71,72 can be also the N channel-type.
CPU51 carries out the processing such as computing and input and output according to the control program of pre-save in ROM52.For example, CPU51 is taken into the detected value of the charging and discharging currents of battery block 11,12,13 magnitude of voltage and secondary cell 1 take 250ms as the cycle, based on the magnitude of voltage that is taken into and detected value, the charging current of secondary cell 1 or charging power or discharging current or discharged power are added up, will be stored in RAM53 by charging capacity or the discharge capacity that accumulative total is calculated.The unit of the charge/discharge capacity when charging and discharging currents, charge-discharge electric power are added up respectively is Ah, Wh.Have again, the highest voltage (hereinafter referred to as maximum monomer voltage) among the battery block 11,12 that CPU51 determines to be taken into, 13 magnitude of voltage, and it is stored in RAM53.The cycle that is taken into of the detected value of magnitude of voltage and charging and discharging currents is not limited to 250ms.CPU51 also generates the data such as residual capacity, charging current, and the data that generate are sent to electric equipment 20 from Department of Communication Force 9.
Electric equipment 20 possesses the terminal part 22 that is connected with control power supply unit 21.Control power supply unit 21 and drive terminal part 22 by not shown source power supply supply capability, and secondary cell 1 discharged and recharged the path supplying charging current.Control power supply unit 21 also in the situation that supply with from the electric power of source power supply and be disconnected, drive terminal part 22 by the discharging current of supplying with in the path that discharges and recharges by secondary cell 1.In the situation that the secondary cell 1 that control power supply unit 21 charges is lithium ion battery, for example charge with constant current (MAX electric current 0.5～1C left and right) constant voltage (about MAX4.2～4.4V/ battery cell).The cell voltage of secondary cell 1 be full of electro-detection begin voltage more than and charging current be below setting state continuance certain hour when above, be judged to be secondary cell 1 and be in and be full of electricity condition (below, referred to as being full of electricity).In addition, for example also can become at the cell voltage of secondary cell 1 fixed voltage makes MOSFET71 end to detect the open circuit voltage (OCV=Open Circuit Voltage) of secondary cell 1 in only during certain when above, in the situation that detected open circuit voltage is more than fixed voltage, is judged to be and is full of electricity.
Controlling between power supply unit 21 and Department of Communication Force 9, will control power supply unit 21 as main device, will comprise the control part 5 of Department of Communication Force 9 as from device, carry out the communication based on communication modes such as SMBus (System Management Bus) modes.In the situation that the SMBus mode, serial clock (SCL) provides from controlling power supply unit 21, and serial data (SDA) is given and accepted by two-way between control power supply unit 21 and Department of Communication Force 9.In the present embodiment, control power supply unit 21 and take 2 seconds as the cycle, Department of Communication Force 9 is carried out poll (polling), read the content of the data that Department of Communication Force 9 will send.Set by controlling power supply unit 21 sides in 2 seconds of polling cycle.
By this poll, for example the data of the residual capacity of secondary cell 1 are transferred into and control power supply unit 21 take 2 seconds as the cycle via Department of Communication Force 9, are shown as the value (%) of residual capacity in the not shown display that electric equipment 20 has.In addition, the initial value of the charging current of being set by control part 5, be charging current data and residual capacity data similarly, be sent to control power supply unit 21 via Department of Communication Force 9.In controlling power supply unit 21, based on the charging current that sends out from control part 5, secondary cell 1 is carried out constant-current constant-voltage charging.
Next, illustrate that the increase correction of the period when basis discharges and recharges secondary cell 1 is full of a method of the learning value learning capacity of capacitance.Moreover the study that is full of capacitance is undertaken by known method, for example again calculates based on the charging capacity of secondary cell 1 and/or discharge capacity to be full of capacitance (FCC=Full Charge Capacity).
Fig. 2 is the key diagram of method that the period of secondary cell 1 is counted.The transverse axis of Fig. 2 represents the process of time, and the longitudinal axis represents that residual capacity is the ratio of learning capacity with respect to the relative surplus capacity (RSOC=Relative State Of Charge) of secondary cell 1.The part that is endowed " zero " mark in figure represents that period produces the point of increment (=1 circulation).In addition, the part that is endowed the "●" mark represents the point that learning capacity is corrected based on cycle count.In Fig. 2, for simplicity, suppose that RSOC changes between 25%, 50%, 75% and 100%, suppose that the chance that moment T0 does not have study to be full of capacitance between T19 extremely constantly describes.
Be charged to and be full of capacitance and RSOC is 100% secondary cell 1, be discharged to 50% during moment T0～T1, be charged to 75% during moment T1～T2.Equally, secondary cell 1 is discharged to 50% during moment T2～T3, is charged to 75% during moment T3～T4, and when being discharged to 50% during moment T4～T5, the discharge capacity from moment T0 reaches learning capacity period increase by 1 thus.Then, for example secondary cell 1 is charged to 100% during moment T5～T6, and then is full of electricity in the situation that moment T7 detects secondary cell 1, and learning capacity is multiplied by the 1st deterioration factor less than 1 (for example 0.9992) and revises.In the present embodiment, because the direction that diminishes to learning capacity is revised, therefore revised RSOC becomes large, but RSOC can not surpass 100%.
Next, secondary cell 1 is discharged to 50% during moment T8～T9, is charged to 100% during moment T9～T10, and when being discharged to 50% during moment T11～T12, period increases by 1.Follow again, secondary cell 1 is charged to 75% during moment T12～T13, be discharged to 25% during moment T13～T14, be charged to 50% during moment T14～T15, be discharged to 25% during moment T15～T16, be charged to 75% during moment T16～T17, when being discharged to 50% during moment T17～T18, period further increases by 1.
Afterwards, for example continued the secondary cell 1 of charging during moment T18～T19, when moment T19 detected secondary cell 1 and is full of electricity, learning capacity was corrected.At this moment, due to front once after moment T9 revises learning capacity period increased by 2, therefore carry out corresponding 2 circulations of correction of the learning capacity under T19 constantly.In addition, revise by the direction that tails off to learning capacity, thereby revised RSOC increases with the ratio less than 100%.
Moreover in Fig. 2, revised RSOC changes discontinuously when the correction of having carried out learning capacity in order to avoid as far as possible, and after the period of secondary cell 1 has increased more than 1, just revises learning capacity when being full of electricity detecting, but is not limited thereto.
In addition, although make period increase by 1 when discharge capacity reaches learning capacity, also can when reaching learning capacity, charging capacity make period increase by 1.
Then, the additive method of revising learning capacity when continuing to preserve secondary cell 1 not being discharged and recharged is described.
The chart of the degree list of the deteriorated speed in Fig. 3 means between battery block 11,12,13 storage life.In Fig. 3, the voltage range of each row is divided into " lower than 4.0V ", " more than 4.0V and lower than 4.1V " and " more than 4.1V ", and temperature range of each row is divided into " lower than 10 ℃ ", " more than 10 ℃ and lower than 30 ℃ ", " more than 30 ℃ and lower than 50 ℃ " reach " more than 50 ℃ ".Voltage range and temperature range are not limited to above-mentioned scope.To be degradation speed decide according to the combination of these voltage ranges and temperature range the degree of the degradation speed of secondary cell 1, and the value in the chart of 3 row 4 row shown in Figure 3 is as being stored in ROM52 with each voltage range and the corresponding degradation speed of temperature range.
The degradation speed of secondary cell 1 is according to the high/low of the temperature range of high/low, the secondary cell 1 of battery block 11,12,13 voltage range and be changed to 300 from 0.For example, in the situation that degradation speed is 0, deteriorated speed is ignored in expression.In addition, in the situation that degradation speed is 300, be for example 10 situation than degradation speed, expression is carried out deteriorated with the speed of 30 times.
In the situation that continue to preserve secondary cell 1, the battery temperature of the cell voltage of the battery block that voltage is the highest, secondary cell 1 is applicable to Fig. 3, to determine degradation speed.This is to have considered to have produced in the battery block 11,12 that is connected in series, each cell voltage of 13 when uneven, and the degradation speed of the battery block that voltage is the highest is maximum.Read from ROM52 according to the combination of such voltage range and temperature range and definite degradation speed, the degradation speed of reading is added up along with the process between storage life, at aggregate-value during greater than setting (for example 50000), learning capacity is multiplied by the 2nd deterioration factor less than 1 (for example 0.99) and revises.
In addition, sometimes during according to the 1st and the 2nd deterioration factor, the learning capacity of secondary cell 1 being revised as described above, can be different from for learning capacity the correction of above-mentioned correction.
Fig. 4 is the key diagram that the correction of the RSOC that is carried out when low-voltage detects is described.The transverse axis of Fig. 4 represents the time, and the longitudinal axis represents the RSOC of secondary cell 1.In Fig. 4 with the situation of the RSOC before the constantly correction under T21 of solid line (perhaps dotted line) expression higher than (perhaps lower than) revised RSOC.
The cell voltage of secondary cell 1 in discharge or in preserving when moment T21 drops to the low-voltage of regulation, with the mandatory ratio that is modified to regulation of the RSOC of secondary cell 1.For example, when the cell voltage of the battery block that voltage is minimum among battery block 11,12,13 drops to 3V, the RSOC of secondary cell 1 is modified to 4% or 8%.In the situation that carried out this correction, suppose that the ratio of precision of this correction wants high based on the precision of the correction of the 1st and the 2nd deterioration factor, be 0 (zero) thereby the aggregate-value of above-mentioned degradation speed is removed.In as described above RSOC is modified to 4% situation of (perhaps 8%), calculate learning capacity according to the mode that the discharge capacity of calculating before this is 96% (perhaps 92%) of learning capacity.
Moreover, the learning capacity of considering secondary cell 1 with respect to the ratio of nominal capacity (DC) large/degradation of little and secondary cell 1 little/corresponding greatly.Learning capacity before this learning capacity can be both to revise can be also revised learning capacity, but preferably use revised learning capacity.According to above-mentioned this ratio large/littlely make the charged electrical rheology of secondary cell 1 large/diminish, suppressed in fact thus the rising of C ratio, therefore can suppress the deteriorated of secondary cell 1.In the present embodiment, also can be only the 1st deterioration factor be multiplied each other to revise with the initial value that is full of capacitance, charging current (the perhaps value of tight front) respectively and be full of capacitance, charging current.In addition, can also be only the 2nd deterioration factor be multiplied each other to revise with the initial value that is full of capacitance, charging current (the perhaps value of tight front) respectively and be full of capacitance, charging current.
Have again, also the 1st deterioration factor and the 2nd deterioration factor can be multiplied each other to revise with the initial value that is full of capacitance, charging current (the perhaps value of tight front) respectively and be full of capacitance, charging current.
Moreover, also can also multiply by fixed coefficient to the 1st deterioration factor, the 2nd deterioration factor when reducing (correction) charging current, can make thus the reduction of charging current become large or diminish.
Particularly, the initial value (setting electric current) that the use of secondary cell 1 is begun just interim charging current multiply by above-mentioned ratio calculates charging current, generate the data of the charging current of calculating, with data 20 outputs from Department of Communication Force 9 to electric equipment that generate.Thus, from providing charging current after being lowered as the electric equipment 20 of charger to battery pack 10.
Below, utilize the flow chart of the action of the control part 5 that represents above-mentioned battery pack to be described.Processing shown below is carried out according to the control program of pre-save in ROM52 by CPU51.
Fig. 5 means the flow chart for the treatment of step of revising the CPU51 of deterioration factor according to the period of secondary cell 1, and Fig. 6 means the flow chart for the treatment of step of revising the CPU51 of deterioration factor according to the degradation of secondary cell 1 in preservation.In addition, Fig. 7 means the charging current of calculating secondary cell 1 and sends the flow chart for the treatment of step of CPU51 of the data of charging current.Referred in this deterioration factor be by numerical value little/represent greatly to be accompanied by secondary cell use degradation large/little.
The cycle that Fig. 5,6 processing are activated for example is 250m second, 20 seconds, but is not limited thereto.In addition, the processing of Fig. 7 is activated before the charging beginning.The deterioration factor that uses in the processing of Fig. 5～7 is stored in ROM52.The cycle count mark that uses in Fig. 5,6 processing, cycle counter, accumulative total degradation speed and the deteriorated counter of accumulative total are stored in RAM53.The data of other calculating process also suitably are stored in RAM53.In the initialization process of regulation, it is 0 that cycle count mark, cycle counter, accumulative total degradation speed and the deteriorated counter of accumulative total are eliminated, and deterioration factor is set to 1.
At first, when the processing of Fig. 5 was activated, CPU51 judged that cycle count marks whether to be set to 1 (S11), in the situation that be set to 1 (S11: be), it is 0 (S12) that the cycle count mark is removed, and cycle counter is increased (adding 1) (S13).When the discharge capacity that secondary cell 1 detected by the processing different from the processing shown in Fig. 5～7 or charging capacity have reached learning capacity, be set to 1 at this cycle count mark.
When the processing of step S13 finishes or in step S11, the cycle count mark was not set to 1 (S11: no), CPU51 judged whether cycle counter is 0 (S14).When cycle counter is 0 (S14: be), because cycle counter from the correction of previous deterioration factor does not once advance yet, therefore finish the processing of Fig. 5.
Be not 0 o'clock (S14: no) at cycle counter, next CPU51 determines whether that secondary cell 1 being detected is full of electricity (S15), (S15: no) when being full of electricity not detected, directly finishes the processing of Fig. 5.The detection that is full of electricity is undertaken by the processing different from the processing shown in Fig. 5～7.(S15: be) when being full of electricity detected, CPU51 is initialized as 1 (S16) afterwards with the 1st deterioration factor corresponding with the degradation that is accompanied by period, and the content of the 1st deterioration factor stored in RAM53 be multiply by 0.9992 (S17).
Then, CPU51 makes cycle counter reduce (subtracting 1) (S18), judges whether cycle counter is 0 (S19), be not (S19: no) at 0 o'clock, processes being back to step S17.By the processing of above step S17 to S19, until cycle counter becomes till 0, repeatedly the 1st deterioration factor be multiply by 0.9992.Thus, increase with the degradation that the 1st deterioration factor is set up after corresponding.
Be 0 o'clock (S19: be) at cycle counter, CPU51 revises (S20) afterwards to the content that the content of the deterioration factor stored in ROM52 multiply by the 1st deterioration factor of storing in RAM53, finishes the processing of Fig. 5.
Next, when the processing of Fig. 6 was activated, CPU51 was taken into the voltage of current detector 2 via A/D converter section 4, the voltage that is taken into is scaled electric current detects charging and discharging currents (S31).In fact, also can detect charging and discharging currents based on the voltage that repeatedly is taken into.Afterwards, CPU51 judges that whether greater than-100mA (zone of discharging current) and less than 20mA (zone of charging current) (S32) charging and discharging currents detect for example, in the time of in not being in this scope (S32: no), process entering step S40 described later.
At this, consider to exist in A/D converter section 4 to have the electric current this point that becomes charging current on apparent in transformed error this point and battery pack 10 inside, will not detect less than the electric current of 20mA and be charging current.In addition,, process equally when preserving with not discharging and recharging fully during less than 100mA at the absolute value of discharging current.But, should be not limited to the size of current of charging and discharging currents comparison in step S32-100mA and 20mA.
At the charging and discharging currents that detects during greater than-100mA and less than 20mA (S32: be), not yet discharge and recharge also harmlessly owing to being judged to be, so CPU51 reads the maximum monomer voltage (S33) among battery block 11,12,13 from RAM53.At this, the maximum monomer voltage of reading from RAM53 is written in RAM53 take 250m second as the cycle as described above.Afterwards, CPU51 detects the battery temperature (S34) of secondary cell 1 via A/D converter section 4.
Then, CPU51 is based on the maximum monomer voltage of reading and the battery temperature that detects, and determines accordingly with Fig. 3 and reads a degradation speed (S35) of storing in ROM52.Then, CPU51 degradation speed (S36) that the content addition of the accumulative total degradation speed of storing in RAM53 is read.Thus, degradation speed take 20 seconds as the cycle by accumulative total.Afterwards, CPU51 judges whether the accumulative total degradation speed has surpassed 50000 (S37), in the situation that do not surpass (S37: no), makes to process to enter step S40.
Surpassed at 50000 o'clock (S37: be) in the accumulative total degradation speed, CPU51 will add up degradation speed remove be 0 (S38) afterwards, make the content of the deteriorated counter of accumulative total increase (adding 1) (S39).Then, CPU51 judges whether the deteriorated counter of accumulative total is 0 (S40).Be 0 o'clock (S40: be) at the deteriorated counter of accumulative total, because the deteriorated counter of accumulative total from the correction of previous deterioration factor does not once advance, therefore finish the processing of Fig. 6 yet.
Be not 0 o'clock (S40: no) at the deteriorated counter of accumulative total, next CPU51 determines whether that secondary cell 1 being detected is full of electricity (S41), (S41: no) when being full of electricity not detected, directly finishes the processing of Fig. 6.(S41: be) when being full of electricity detected, CPU51 is initialized as 1 (S42) afterwards with the 2nd deterioration factor corresponding with the degradation of secondary cell 1 in preservation, and the content of the 2nd deterioration factor stored in RAM53 be multiply by 0.99 (S43).
Next, CPU51 makes the deteriorated counter of accumulative total reduce (subtracting 1) (S44), and judges whether the deteriorated counter of accumulative total is 0 (S45), be not (S45: no) at 0 o'clock, makes to process to be back to step S43.By the processing of above step S43 to S45, until the deteriorated counter of accumulative total becomes till 0, repeatedly the 2nd deterioration factor be multiply by 0.99.Thus, increase with the degradation that the 2nd deterioration factor is set up after corresponding.
Be 0 o'clock (S45: be) at the deteriorated counter of accumulative total, CPU51 revises (S46) afterwards to the content that the content of the deterioration factor stored in ROM52 multiply by the 2nd deterioration factor of storing in RAM53, finishes the processing of Fig. 6.
Then, when the processing of Fig. 7 was activated, CPU51 read the maximum monomer voltage (S52) among battery block 11,12,13 from RAM53, and detected the battery temperature (S53) of secondary cell 1 via A/D converter section 4.Afterwards, CPU51 for example determines the initial value (S54) of charging current based on the maximum monomer voltage of reading and the battery temperature that detects according to the list data of storing in ROM52.For definite and initial value (setting electric current) maximum monomer voltage and the corresponding charging current of battery temperature, due to record in detail in patent documentation 1, therefore in this description will be omitted.
Then, CPU51 multiply by to the initial value of determined charging current the deterioration factor of storing in ROM52 and calculates charging current (S55), generate the data (S56) of the charging current of calculating, the data that generate are sent to from Department of Communication Force 9 control power supply unit 21 (S57).
Moreover, in step S55, also can be with the learning capacity of storing in ROM52 with respect to the ratio of nominal capacity as deterioration factor.
In addition, the data of charging current are along with being sent out from the poll of controlling power supply unit 21, keep the correction of learning capacity before being full of electricity or the transmission that keeps the data of the charging current of newly calculating before being full of electricity detected but also can detect in the explanation of Fig. 2.
As more than, according to present embodiment, whenever the discharge capacity (perhaps charging capacity) of secondary cell becomes when being full of capacitance (whenever being counted as 1 circulation time), deterioration factor be multiply by 1st deterioration factor (0.9992) corresponding with the degradation of secondary cell revise.
Thus, whenever the charge and discharge cycles number of secondary cell increases at 1 o'clock, calculate according to the mode that charging current diminishes along with the degradation in a charge and discharge cycles.
Therefore, can suitably reduce charging current according to the degradation of the use that is accompanied by secondary cell.
In addition, the charging current of secondary cell less than the absolute value of 20mA and discharging current less than 100mA during in, by the maximum monomer voltage of time Sequence Detection and battery temperature, whenever the degradation speed corresponding with the maximum monomer voltage that detects and battery temperature by accumulative total after value greater than 50000 o'clock, deterioration factor be multiply by 2nd deterioration factor (0.99) corresponding with the degradation of secondary cell revises.
Therefore, when the aggregate-value of the degradation speed that had been added up in both not charged also no between the storage life of discharge at secondary cell surpasses setting, can calculate according to the mode that charging current diminishes along with the degradation corresponding with the afore mentioned rules value.
Have again, learn to be full of capacitance based on charging capacity or the discharge capacity of secondary cell, and according to learning capacity with respect to the ratio (deterioration factor) of nominal capacity large/change of the little charging current that decides secondary cell is large/diminish.
That is to say, along with the use of secondary cell (passing through between the increase of period and storage life etc.) and learning capacity can descend, calculate according to the less mode of the larger deterioration factor of degradation of the use that is accompanied by secondary cell thus, therefore the larger charging current of degradation according to secondary cell is determined littlely.
Therefore, can suitably reduce charging current according to the degradation of the use that is accompanied by secondary cell.
In addition, detecting after secondary cell is full of electricity, be full of capacitance according to the 1st deterioration factor or above-mentioned the 2nd deterioration factor correction.
Therefore, be retained owing to becoming the correction that is full of capacitance before being full of electricity condition at secondary cell, so can guarantee until the capacity of secondary cell reaches the continuity that is full of the charging till electricity.
Should think that this disclosed execution mode is all only illustration, and be not restricted contents.Scope of the present invention is not foregoing, and is represented by claim, comprises the content that is equal to claims and the whole changes in scope.
Claims (8)
1. the determining method of a charging current, be used for the charging current that decision possesses the battery pack of secondary cell, it is characterized in that,
The charging current of described secondary cell or charging power or discharging current or discharged power are added up, calculate charging capacity or discharge capacity,
Judge the charging capacity calculate or discharge capacity whether greater than being full of capacitance,
Whenever being judged to be when being full of capacitance, utilize 1st deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
2. the determining method of charging current according to claim 1, is characterized in that,
During determining that the charging current of described secondary cell and discharging current are less than rated current,
Press voltage and the temperature of the described secondary cell of time Sequence Detection in during determined,
Determine the degradation speed of the speed that expression and the voltage that detects and temperature are accordingly deteriorated,
Determined degradation speed is added up,
Whether judge aggregate-value greater than setting,
When being judged to be greater than setting, utilize 2nd deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
3. the determining method of a charging current, be used for the charging current that decision possesses the battery pack of secondary cell, it is characterized in that,
During determining that the charging current of described secondary cell and discharging current are less than rated current,
Press voltage and the temperature of the described secondary cell of time Sequence Detection in during determined,
Determine the degradation speed of the speed that expression and the voltage that detects and temperature are accordingly deteriorated,
Determined degradation speed is added up,
Whether judge aggregate-value greater than setting,
When being judged to be greater than setting, utilize 2nd deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
4. the determining method of a charging current, be used for to determine that the charging capacity that obtains based on the charging current of secondary cell or charging power or discharging current or discharged power are added up or discharge capacity learn to be full of the charging current of the battery pack of capacitance, it is characterized in that
Calculate learn be full of capacitance with respect to the ratio of specified volume,
According to the ratio of calculating large/littlely decide the charged electrical rheology of described secondary cell large/diminish.
5. the determining method of the described charging current of according to claim 1 to 3 any one, is characterized in that,
Judging whether described secondary cell is in is full of electricity condition,
Be judged to be in be full of electricity condition after, utilize described the 1st deterioration factor or described the 2nd deterioration factor correction to be full of capacitance.
6. a battery pack, possess secondary cell,
Described battery pack is characterised in that also to possess:
Charging current or charging power or discharging current or the discharged power of the described secondary cell of accumulative total, the unit of calculating charging capacity or discharge capacity;
Whether the charging capacity that judgement is calculated or discharge capacity be greater than the unit that is full of capacitance; With
Whenever this unit is judged to be when being full of capacitance, utilize 1st deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the charging current of described secondary cell.
7. a battery pack, possess secondary cell,
Described battery pack is characterised in that also to possess:
Determine the unit during the charging current of described secondary cell and discharging current are less than rated current;
Press the voltage of the described secondary cell of time Sequence Detection and the unit of temperature in during this unit is determined;
The voltage that detects according to this unit and temperature are determined the unit of the degradation speed of the speed that expression is deteriorated;
The determined degradation speed in this unit is carried out the unit of accumulative total;
Judge that aggregate-value that this unit adds up is whether greater than the unit of setting; With
When this unit is judged to be greater than setting, utilize 2nd deterioration factor corresponding with the deteriorated degree of described secondary cell to revise the unit of the charging current of described secondary cell.
8. battery pack learns to be full of capacitance based on the charging capacity or the discharge capacity that the charging current of secondary cell or charging power or discharging current or discharged power are added up and obtain,
Described battery pack is characterised in that to possess:
Calculate learn be full of capacitance with respect to the unit of the ratio of specified volume;
The ratio of calculating according to this unit large/littlely decide the charged electrical rheology of described secondary cell large/unit that diminishes; With
Generate the unit of the data of the charging current that determines.
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| JP2011-283562 | 2011-12-26 | ||
| JP2011283562A JP2013135510A (en) | 2011-12-26 | 2011-12-26 | Determination method of charging current and battery pack |
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| CN106937534A (en) * | 2014-12-16 | 2017-07-07 | 英特尔公司 | Mechanism for extending the cycle life of battery |
| CN109713741A (en) * | 2017-10-26 | 2019-05-03 | 三星电子株式会社 | Electronic device including battery |
| CN111801586A (en) * | 2018-03-07 | 2020-10-20 | 松下知识产权经营株式会社 | Method for evaluating remaining performance of rechargeable battery, program for evaluating remaining performance of rechargeable battery, arithmetic device, and system for evaluating remaining performance |
| CN113507154A (en) * | 2021-07-12 | 2021-10-15 | 海南小鲨鱼智能科技有限公司 | Charging method and device, charger and electronic equipment |
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| JPWO2014148018A1 (en) * | 2013-03-19 | 2017-02-16 | 三洋電機株式会社 | Secondary battery charging system and method, and battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103633699A (en) * | 2013-11-28 | 2014-03-12 | 安徽启光能源科技研究院有限公司 | Mobile energy storage battery system |
| CN106937534A (en) * | 2014-12-16 | 2017-07-07 | 英特尔公司 | Mechanism for extending the cycle life of battery |
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| CN109713741A (en) * | 2017-10-26 | 2019-05-03 | 三星电子株式会社 | Electronic device including battery |
| CN111801586A (en) * | 2018-03-07 | 2020-10-20 | 松下知识产权经营株式会社 | Method for evaluating remaining performance of rechargeable battery, program for evaluating remaining performance of rechargeable battery, arithmetic device, and system for evaluating remaining performance |
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Application publication date: 20130626 |