CN102741699A - Full-charge capacity correction circuit, charging system, battery pack, and full-charge capacity correction method - Google Patents

Full-charge capacity correction circuit, charging system, battery pack, and full-charge capacity correction method Download PDF

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CN102741699A
CN102741699A CN2010800624749A CN201080062474A CN102741699A CN 102741699 A CN102741699 A CN 102741699A CN 2010800624749 A CN2010800624749 A CN 2010800624749A CN 201080062474 A CN201080062474 A CN 201080062474A CN 102741699 A CN102741699 A CN 102741699A
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ratio
electric power
power storage
charge capacity
value
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CN102741699B (en
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仲辻俊之
森元刚
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
    • G01R31/3832—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration without measurement of battery voltage

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A full-charge capacity correction circuit comprises: an integration unit for integrating the value of the current flowing through a secondary battery and thereby calculating the integration value; first and second estimation units for estimating the storage ratios of the secondary battery as first and second storage ratios; a full-charge capacity correction unit that estimates the full-charge capacity value of the secondary battery on the basis of a difference integration value and the ratio between the difference between the first and second storage ratios and 1 and stores the estimated full-charge capacity value as a new full-charge capacity value, thereby correcting the full-charge capacity value, the difference integration value being the integration value integrated by the integration unit in the interval from the estimation of the first storage ratio by the first estimation unit to the estimation of the second storage ratio by the second estimation unit; and an open ratio estimation unit for, when an open voltage condition is satisfied, estimating the storage ratio of the secondary battery on the basis of the terminal voltage of the secondary battery, the open voltage condition being based on the condition that the current flowing through the secondary battery becomes less than an open determination value previously set for determining a condition under which an open voltage can be obtained as the terminal voltage of the secondary battery.

Description

Full charge capacity correction circuit, charging system, battery component and full charge capacity modification method
Technical field
The present invention relates to full charge capacity modification method that the full charge capacity value of secondary cell is revised and full charge capacity correction circuit, charging system and the battery component that uses this method.
Background technology
From in the past, secondary cell is widely used in vehicles such as electronic equipment, electric automobile or hybrid vehicle, mixed drive elevator, combinations such as portable personal computer or digital camera, video camera, mobile phone to be had in various devices, the systems such as battery-mounting device, system such as the power-supply system of solar cell or TRT and secondary cell, uninterrupted power supply(ups).
And for example in electronic equipments such as portable personal computer, from the viewpoint of availability, demonstration charges into the surplus that can use of secondary cell or before dead battery, gives the alarm.
In addition; In systems such as solar cell power generation or hybrid vehicle, the viewpoint to the load stable power-supplying need make secondary cell be in the state that is recharged all the time to a certain extent; On the other hand; From the dump power that absorbs generating or the needs of regenerated electric power, be in full charging and the state that can't charge and the control of charging for fear of secondary cell, make the electric power storage electric weight that charges into respect to full charge capacity (FCC; Full Charge Capacity) ratio (percent) SOC (State Of Charge, charged state) for example passes in 20% to 80% scope.
So, in order to detect the surplus that can use that charges into secondary cell or to calculate SOC, need know the full charge capacity of secondary cell.But, owing to the full charge capacity of secondary cell is followed the deterioration of secondary cell and reduced, therefore obtain residual capacity of battery or SOC if directly use the full charge capacity when dispatching from the factory, then its error becomes big.
This is knownly had a following method: even after bringing into use secondary cell, through making secondary cell from fully charged state continuous discharge and discharge fully, the discharge current through accumulative total this moment calculates full charge capacity, revises or upgrades full charge capacity with this.But this method is in order to revise full charge capacity etc., and the secondary cell that in device, system, is in user mode discharge from fully charged state fully, so it is limited to revise the chance of full charge capacity etc.
Therefore; Known have a following method: even secondary cell is by discharge fully; Begin to reach the charge capacity till the full charging through detecting to secondary cell from charging; And with of electric power storage electric weight (the charging beginning residual capacity) addition of this charge capacity, thereby calculate full charge capacity (for example, with reference to patent documentation 1) with when beginning charging.In addition, in patent documentation 1, put down in writing the technology that decides the electric power storage electric weight in when beginning charging according to cell voltage.In view of the above, even secondary cell also can be revised full charge capacity not by discharge fully.
In the method that patent documentation 1 is put down in writing, when according to the electric power storage electric weight in cell voltage when beginning decision charging, use the tables of data of the relation of expression cell voltage and electric power storage electric weight (residual capacity).At this, such as Fig. 3 of patent documentation 1 record, the terminal voltage of battery and electric power storage electric weight (residual capacity) are to have correlationship between the SOC with respect to the ratio (%) of full charge capacity.
Therefore, must convert SOC into by first terminal voltage, and ratio and the full charge capacity of this SOC multiplied each other the electric power storage electric weight when calculating the charging beginning with this with battery.But therefore the electric power storage electric weight the when charging of so obtaining begins comprises the error of full charge capacity because the full charge capacity that is based on before revising calculates.
Therefore, existence will from charging begin to play secondary cell when reaching charge capacity till the full charging with the charging beginning (the charging beginning residual capacity) addition of electric power storage electric weight and the full charge capacity that obtains also comprises the problem of error.
Patent documentation 1: Jap.P. open communique spy open 2006-177764 number
Summary of the invention
The object of the present invention is to provide a kind of straightener meeting that can increase full charge capacity, and compare full charge capacity correction circuit, charging system, battery component and the full charge capacity modification method of the correction precision that can improve full charge capacity with the method that patent documentation 1 is put down in writing.
The related full charge capacity correction circuit of one side of the present invention comprises: accumulative total portion, calculate aggregate-value through the flow through current value of electric current of secondary cell of accumulative total; Capacity storage portion, the full charge capacity value of the full charge capacity of the said secondary cell of storage representation; The 1st infers portion; When the inferred condition that satisfies as the condition that can infer the electric power storage ratio; The electric power storage ratio of said secondary cell is estimated as the 1st electric power storage ratio; Wherein, said electric power storage ratio is to accumulate electric power storage electric weight in said secondary cell with respect to the ratio of the full charge capacity of the reality of this secondary cell; The 2nd infers portion; After said the 1st electric power storage ratio by said the 1st portion of inferring; Keep watch on and whether to satisfy, when satisfying this and can infer condition, the electric power storage ratio of the said secondary cell of this moment is estimated as the 2nd electric power storage ratio as the inferred condition that can infer the condition of said electric power storage ratio; Full charge capacity correction portion; Based on difference aggregate-value and the difference of said the 1st electric power storage ratio and said the 2nd electric power storage ratio and 1 ratio; Infer the full charge capacity value of said secondary cell; Be stored in said capacity storage portion through full charge capacity value that this is inferred as new full charge capacity value and revise the full charge capacity value; Wherein, said difference aggregate-value in said the 1st portion of inferring said the 1st electric power storage ratio rise till said the 2nd electric power storage ratio to said the 2nd portion of inferring during by said accumulative total portion aggregate-value totally; The open circuit ratio is inferred portion; With open circuit voltage conditions as the said condition of inferring; When satisfying this open circuit voltage conditions; Infer the electric power storage ratio of said secondary cell based on the terminal voltage of said secondary cell, wherein, whether said open circuit voltage conditions is being open-circuit voltage and predefined open circuit decision content is a condition when the electric current of the said secondary cell of flowing through less than the terminal voltage that is used to judge this secondary cell; And Correction and Control portion, infer portion and the said the 2nd with the said the 1st and infer in the portion at least one and be set at said open circuit ratio and infer portion.
In addition, the charging system that another aspect of the present invention is related comprises: above-mentioned full charge capacity correction circuit; And charging part; Full charging voltage through said secondary cell being applied this secondary cell is charged; Wherein, The said test section that completely charges when the electric current of this secondary cell of flowing through in the charging process in said charging part during less than predefined decision threshold, is judged to be this secondary cell and is in full charging.
In addition, the battery component that another aspect of the present invention is related comprises: above-mentioned full charge capacity correction circuit and said secondary cell.
In addition, the full charge capacity modification method that another aspect of the present invention is related comprises following operation: the accumulative total operation, calculate aggregate-value through the flow through current value of electric current of secondary cell of accumulative total; The 1st infers operation; When the inferred condition that satisfies as the condition that can infer the electric power storage ratio; The electric power storage ratio of said secondary cell is estimated as the 1st electric power storage ratio; Wherein, said electric power storage ratio is to accumulate electric power storage electric weight in said secondary cell with respect to the ratio of the full charge capacity of the reality of this secondary cell; The 2nd infers operation; Infer after operation infers said the 1st electric power storage ratio the said the 1st; Keep watch on and whether to satisfy, when satisfying this and can infer condition, the electric power storage ratio of the said secondary cell of this moment is estimated as the 2nd electric power storage ratio as the inferred condition that can infer the condition of said electric power storage ratio; Full charge capacity correction operation; Based on difference aggregate-value and the difference of said the 1st electric power storage ratio and said the 2nd electric power storage ratio and 1 ratio; Infer the full charge capacity value of said secondary cell; And this full charge capacity value of inferring out revised this full charge capacity value as new full charge capacity value; Wherein, this difference aggregate-value for the said the 1st infer operation infer said the 1st electric power storage ratio rise to the said the 2nd infer operation till inferring said the 2nd electric power storage ratio during, the aggregate-value that goes out through said accumulative total operation accumulative total; And the open circuit ratio is inferred operation; With open circuit voltage conditions as the said condition of inferring; When satisfying this open circuit voltage conditions; Infer the electric power storage ratio of said secondary cell based on the terminal voltage of said secondary cell, wherein, whether said open circuit voltage conditions is being open-circuit voltage and predefined open circuit decision content is a condition when the electric current of the said secondary cell of flowing through less than the terminal voltage that is used to judge this secondary cell; Wherein, inferring operation and the said the 2nd with the said the 1st infers at least one operation in the operation and is set at said open circuit ratio and infers operation.
Description of drawings
Fig. 1 is the block diagram of an example of the structure of the expression battery component and the charging system that comprise the full charge capacity correction circuit that uses the related full charge capacity modification method of an embodiment of the present invention.
Fig. 2 is the block diagram of an example of expression control part shown in Figure 1.
Fig. 3 is the key diagram that expression is stored in an example of the look-up table in the table storage part shown in Figure 1.
Fig. 4 is the process flow diagram of an example of the action of expression full charge capacity correction circuit shown in Figure 1.
Fig. 5 is the process flow diagram of an example of the action of expression full charge capacity correction circuit shown in Figure 1.
Fig. 6 is the process flow diagram of an example of the action of expression full charge capacity correction circuit shown in Figure 1.
Fig. 7 is the process flow diagram of an example of the action of expression full charge capacity correction circuit shown in Figure 1.
Fig. 8 is the process flow diagram of an example of the action of expression full charge capacity correction circuit shown in Figure 1.
Fig. 9 is used for explanation to use the open circuit ratio portion of inferring to infer portion as the 1st, and the key diagram of the modification method of the full charge capacity value FCC when using the ratio portion of inferring of completely charging to infer portion as the 2nd.
Figure 10 is used for explanation to use the open circuit ratio portion of inferring to infer portion as the 1st, and the key diagram of the modification method of the full charge capacity value FCC when using the ratio portion of inferring of completely charging to infer portion as the 2nd.
Figure 11 is used for explanation to use the open circuit ratio portion of inferring to infer portion as the 1st, and the key diagram of the modification method of the full charge capacity value FCC when using the base ratio portion of inferring to infer portion as the 2nd.
Figure 12 is used for explanation to use the open circuit ratio portion of inferring to infer portion as the 1st, and the key diagram of the modification method of the full charge capacity value FCC when using the base ratio portion of inferring to infer portion as the 2nd.
Figure 13 be used to explain use the open circuit ratio infer portion as the 1st infer the modification method of the full charge capacity value FCC of portion and the 2nd when inferring portion key diagram.
Figure 14 be used to explain use the open circuit ratio infer portion as the 1st infer the modification method of the full charge capacity value FCC of portion and the 2nd when inferring portion key diagram.
Embodiment
Below, based on description of drawings embodiment involved in the present invention.In addition, the structure of mark same-sign is represented identical structure in each figure, and omits its explanation.Fig. 1 is the block diagram of an example of the structure of the expression battery component 2 and the charging system 1 that comprise the full charge capacity correction circuit 5 that uses the related full charge capacity modification method of an embodiment of the present invention.Charging system 1 unitized cell assemblies 2 shown in Figure 1 constitutes with equipment side circuit 3.
Charging system 1 for example is the battery-mounted device system of vehicles such as electronic equipments such as portable personal computer or digital camera, mobile phone, electric automobile or hybrid vehicle etc.And equipment side circuit 3 for example is the main part of these battery-mounted device systems, and load circuit 34 is based on from the electric power supply of battery component 2 and the load circuit that moves in these battery-mounted device systems.
Battery component 2 comprises: secondary cell 4, full charge capacity correction circuit 5, current detecting impedance 6, temperature sensor 7, on-off element Q1, Q2 and splicing ear 11,12,13.In addition, full charge capacity correction circuit 5 comprises: control part 50, voltage detection department 51, current detecting part 52, temperature detecting part 53 and Department of Communication Force 54.
In addition, charging system 1 is not limited to battery component 2 and equipment side circuit 3 can separated structures, also can constitute a full charge capacity correction circuit 5 by charging system 1 integral body.In addition, can also share the textural element of full charge capacity correction circuit 5 by battery component 2 and equipment side circuit 3.In addition, secondary cell 4 must not form battery component, and for example full charge capacity correction circuit 5 also can constitute the ECU (Electric Control Unit, electronic control unit) of vehicle mounted.
Equipment side circuit 3 comprises: splicing ear 31,32,33, load circuit 34, charging part 35, Department of Communication Force 36, control part 37 and display part 38.Charging part 35 is connected with splicing ear 31,32 with power supply, and Department of Communication Force 36 is connected with splicing ear 33.
In addition, when battery component 2 is installed on 3 last times of equipment side circuit, the splicing ear 11,12,13 of battery component 2 is connected with the splicing ear 31,32,33 of equipment side circuit 3 respectively.
Department of Communication Force the 54, the 36th can be via the communication interface circuit of splicing ear 13,33 mutual transceive data.
Charging part 35 is to battery component 2 supply and power circuit from the corresponding electric current of the control signal of control part 37, voltage via splicing ear 31,32.Charging part 35 can be the power circuit that is generated the charging current of battery component 2 by source power supply voltage for example, also can be based on TRT that natural energies such as sunshine, wind-force or waterpower for example generate electricity or the TRT that generates electricity through power such as internal combustion engines etc.
Display part 38 for example uses LCD or LED (Light Emitting Diode, light emitting diode).In addition, when for example equipment side circuit 3 is electronic equipments such as portable personal computer or digital camera, also can use display device such as LCD that this electronic equipment possesses as display part 38.
The control circuit that control part 37 for example is to use micro computer to constitute.And; When Department of Communication Force 36 receives from request indication that the control part 50 of battery component 2 sends through Department of Communication Force 54; The request that control part 37 receives according to Department of Communication Force 36 is indicated and is controlled charging part 35, makes charging part 35 indicate corresponding electric current and voltage to splicing ear 11,12 outputs and the request of sending from battery component 2.
In battery component 2, splicing ear 11 is connected with the positive pole of secondary cell 4 with on-off element Q1 via on-off element Q2.As on-off element Q1 and on-off element Q2, for example can use the FET (Field Effect Transistor, field effect transistor) of p raceway groove.
The negative electrode of the parasitic diode of on-off element Q1 is towards the direction of secondary cell 4, if break off then only cut off the electric current of the course of discharge of secondary cell 4.In addition, the negative electrode of the parasitic diode of on-off element Q2 is set at the direction of splicing ear 11, if break off then the electric current that only cuts off the charging direction of secondary cell 4.On-off element Q1, the common conducting of Q2, thus the protection secondary cell when unusual, broken off.
In addition, splicing ear 12 is connected via the negative pole of current detecting impedance 6 with secondary cell 4, constitutes from the current path of splicing ear 11 via on-off element Q2, on-off element Q1, secondary cell 4 and current detecting impedance 6 to splicing ear 12.
In addition; Splicing ear 11,12,13,31,32,33 so long as the structure that battery component 2 and equipment side circuit 3 is electrically connected get final product; For example can be electrode or connector (connector), terminal board (terminal block) etc., also can be face (land) or pad wiring patterns such as (pad).
Current detecting impedance 6 is so-called shunting impedances that current detecting is used, and converts the charging current and the discharge current of secondary cell 4 into magnitude of voltage.In addition, replace current detecting impedance 6, for example also can make current measuring elements such as Current Transformer or Hall element, the perhaps conducting resistance of on-off element Q1, Q2.
Temperature sensor 7 for example uses sensible heat elements such as thermistor (thermistor) or thermopair to constitute, for example be close to secondary cell 4 or be arranged on secondary cell 4 near.And temperature sensor 7 is to the voltage signal of the temperature t of temperature detecting part 53 output expression secondary cells 4.
Secondary cell 4 for example can be a monocell, for example can be the Battery pack of a plurality of secondary cells of being connected in series, and for example also can be the Battery pack of a plurality of secondary cells of being connected in parallel, and can also be the Battery pack that combined serial is connected with parallel connection.As secondary cell 4, for example use lithium rechargeable battery.In addition, secondary cell 4 is not limited to lithium rechargeable battery, for example can use various secondary cells such as nickel-hydrogen secondary cell or NI-G secondary cell.
But; Since after the open circuit ratio stated infer portion 503, voltage conversion ratio and obtain portion 505 and infer the SOC of secondary cell 4 based on the terminal voltage value Vb of secondary cell 4; Therefore compare with nickel-hydrogen secondary cell or NI-G secondary cell, the lithium rechargeable battery that the variable quantity of terminal voltage is bigger with respect to the variation of the surplus of secondary cell 4 is more suitable for as secondary cell 4.
Voltage detection department 51 for example uses analog-digital converter to constitute, and detects the terminal voltage (voltage between terminals) of secondary cell 4, and representes the signal of this terminal voltage value Vb to control part 50 outputs.
Current detecting part 52 for example uses analog-digital converter to constitute, and detects the voltage Vr between the two ends of current detecting impedance 6, and the signal that will represent this voltage Vr as expression flow through secondary cell 4 current value I c information and export control part 50 to.In addition, for the information (voltage Vr) of expression current value I c, current detecting part 52 for example with on the occasion of the direction of expression to secondary cell 4 chargings, is represented the direction with secondary cell 4 discharges with negative value.
In control part 50, through this voltage Vr is obtained the current value I c of the secondary cell 4 of flowing through divided by the resistance value R of current detecting impedance 6.Current value I c representes the discharge current of secondary cell 4 with the charging current on the occasion of expression secondary cell 4 with negative value.
Temperature detecting part 53 for example uses analog-digital converter to constitute, and will convert digital value into from the voltage signal of temperature sensor 7 outputs, and its signal as the expression temperature t is exported to control part 50.
Fig. 2 is the block diagram of an example of expression control part 50 shown in Figure 1.Control part 50 for example comprises the CPU (Central Processing Unit, CPU) of the calculation process of carrying out appointment; Store the ROM (Read Only Memory, ROM (read-only memory)) of the control program of appointment; The RAM of temporary storaging data (Random Access Memory, RAS); The capacity storage portion 509 and table storage part 510 that for example use ROM to constitute; And their formations such as peripheral circuit.
And; Control part 50 for example is stored in the control program among the ROM through carrying out, thus as charging control section 501 (test section completely charges), electric current accumulative total portion 502 (accumulative total portion), the ratio of opening a way infer portion 503, completely the ratio that charges infers that portion 504, voltage conversion ratio obtain portion 505, base ratio is inferred portion 506, Correction and Control portion 507 and full charge capacity correction portion 508 and the performance function.
Charging control section 501 (test section completely charges) for example will illustrate that abridged AC adapter is connected with charging part 35 etc. and when beginning to charge, receive the notice that users will begin to charge from control part 37 the user.
And charging control section 501 is supplied the charging current of appointments or the indicator signal of charging voltage via Department of Communication Force 54 to the 3 output requests of equipment side circuit, thus the action of control charging part 35.And charging control section 501 makes charging part 35 carry out for example CCCV (Constant Current Constant Voltage, constant current constant voltage) charging.
Then; Thereby charging control section 501 makes the full charging voltage of charging part 35 output secondary cells 4 carry out CV charging (constant-voltage charge); In the implementation of CV charging; When by current detecting part 52 detected current value I c less than as termination condition and the predefined decision threshold Ie of charging the time, be judged to be secondary cell 4 full chargings, and the charging of complete charge portion 35 action.At this moment, charging control section 501 is inferred portion 504 to the ratio that completely charges and is reached full charging with Correction and Control portion 507 notice secondary cells 4.
Decision threshold Ie for example is set to about 0.05It.At this, 1It (battery capacity (Ah)/1 (h)) is when the nominal capacity value of secondary cell is discharged with the current value of 1It, and the residual capacity of secondary cell is just to reach zero current value in 1 hour.
At this moment, charging control section 501 is equivalent to an example of full charging test section.In addition, the example that charging control section 501 is not limited to carry out the CCCV charging also can use other charging modes to charge.Which kind of charging modes no matter charging control section 501 adopt; When as long as charging termination condition under satisfying this charging modes and secondary cell 4 reach full charging, infer portion 504 and Correction and Control portion 507 to the ratio that completely charges and notify this secondary cell 4 to reach full charging to get final product.
In capacity storage portion 509, for example, battery component 2 stores full charge capacity value FCC (Full Charge Capacity) when dispatching from the factory in advance as initial value.The initial value of full charge capacity value FCC for example stores the value of measuring through Theoretical Calculation or actual measurement in advance.In addition, the full charge capacity value FCC that is stored in the capacity storage portion 509 is suitably revised by full charge capacity correction portion 508.
Store look-up table LT in advance in the table storage part 510; This look-up table LT will represent that the electric power storage electric weight is that the temperature t of current value I c and secondary cell of the value RSOC (Relative State Of Charge, charged state relatively) of electric power storage ratio, the secondary cell 4 of flowing through is corresponding with the terminal voltage value Vb of secondary cell 4 with respect to the ratio of the full charge capacity of the reality of secondary cell 4 with percent.
Fig. 3 is the key diagram that expression is stored in the example of the look-up table LT in the table storage part 510 shown in Figure 1.Fig. 3 (a) expression RSOC is the corresponding relation between 95% o'clock the temperature t of terminal voltage value Vb (V11a to V54a), current value I c, secondary cell 4.Fig. 3 (b) expression RSOC is the corresponding relation between the temperature t of current value I c, secondary cell 4 of 50% o'clock terminal voltage value Vb (V11b to V54b), secondary cell 4.Fig. 3 (c) expression RSOC is the corresponding relation between 5.5% o'clock the temperature t of terminal voltage value Vb (V11c to V54c), current value I c, secondary cell 4.
Look-up table LT shown in Figure 3 for example will use new secondary cell 4 and be stored among the ROM through the data in advance that experiment measuring goes out to constitute.In Fig. 3, illustration with RSOC be 95%, 50%, 5.5% corresponding look-up table LT, but table to store with RSOC in the storage part 510 be 0% to 100% the corresponding look-up table LT of gamut.
At this, the electric power storage electric weight of secondary cell 4 is many more, and promptly RSOC is big more; Then terminal voltage value Vb is high more; Therefore, under the condition that current value I c and temperature t equate, in Fig. 3 (a) and (b), (c) relation of V**a＞V**b＞V**c (* be a character) arbitrarily.
In addition, when electric current was flowed through secondary cell 4, owing to the voltage that the internal resistance because of secondary cell 4 produces, more greatly then terminal voltage value Vb was high more for current value I c.That is, charging current increases during charging, and more greatly then terminal voltage value Vb is high more for the value of current value I c.On the other hand, the electric current of course of discharge reduces during discharge, and negative value is that the absolute value of current value I c reduces, i.e. current value I c terminal voltage value Vb high more (slippage of terminal voltage value Vb tails off) more greatly then.
Therefore, in Fig. 3 (a) and (b), (c), under the condition that RSOC and temperature t equate, be the relation of V1**＜V2**＜V3**＜V4** (* be a character) arbitrarily.
In addition, the corresponding relation between the RSOC of secondary cell 4 and the terminal voltage value Vb changes according to temperature t, and generally speaking, temperature t is high more, and then corresponding with same RSOC terminal voltage value Vb descends more.Therefore, in Fig. 3 (a) and (b), (c), under the condition that RSOC and current value I c equate, be the relation of V*1*＞V*2*＞V*3*＞V*4* (* be a character) arbitrarily.
In addition, different according to the material of the positive pole that constitutes battery, negative pole, when temperature t raises, the situation that also exists the terminal voltage value Vb corresponding to rise with same RSOC.Therefore, the relation of the V*1* among Fig. 3 (a) and (b), (c), V*2*, V*3*, V*4* is suitably set according to the characteristic of secondary cell 4 and is got final product.
In addition, look-up table LT shown in Figure 3 is corresponding with the temperature t of RSOC, terminal voltage value Vb, current value I c and secondary cell 4, but look-up table LT can be not comprise the temperature t of secondary cell 4 yet as parameter.In addition, look-up table LT can also not comprise temperature t and current value I c as parameter.
Electric current accumulative total portion 502 is used as electric power storage electric weight Q (aggregate-value) through calculating the electric power storage electric weight that charges into secondary cell 4 by time per unit accumulative total by current detecting part 52 detected current value I c.At this moment; Because current value I c representes the electric current to the direction of secondary cell 4 chargings with positive sign; Represent that with negative sign therefore, electric current accumulative total portion 502 adds the electric power storage electric weight that charges into secondary cell 4 from the electric current of the direction of secondary cell 4 discharges; And deduct from the discharge electricity amount of secondary cell 4 discharges, calculate the electric power storage electric weight Q that charges into secondary cell 4 thus.
Control part 50 calculate electric power storage electric weight Q with respect to the ratio (percent) that is stored in the full charge capacity value FCC in the capacity storage portion 509 as RSOC.
RSOC is obtained by following formula (A).
RSOC＝(Q/FCC)×100(％) ……(A)
And, send the RSOC that so obtains RSOC as secondary cell 4 to control part 37 from control part 50, thereby to the RSOC of equipment side circuit 3 notice secondary cells 4.
The open circuit ratio is inferred portion 503 when, being obtained by voltage detection department 51 detected terminal voltage value Vb with by temperature detecting part 53 detected temperature t during less than predefined open circuit decision content Ith by the absolute value of current detecting part 52 detected current value I c.And; The open circuit ratio is inferred value and the combination of corresponding terminal voltage value Vb and temperature t of portion 503 when working as the combination of the terminal voltage value Vb that obtained and temperature t and in look-up table LT, being 0A as current value I c when consistent in fact, infers the electric power storage ratio RS OCo of the corresponding RSOC of the combination consistent with this as secondary cell 4.
The open circuit ratio infer absolute value that portion 503 uses current value I c less than the condition of open circuit decision content Ith as open circuit voltage conditions.At this moment, owing to obtain electric power storage ratio RS OCo based on the open-circuit voltage of secondary cell 4, and the influence of temperature t reduction, so the accuracy of detection of RSOCo improves.
At this, because with the terminal voltage value Vb mode that the SOC of secondary cell 4 then increases more that rises more that terminal voltage value Vb is corresponding with RSOC among the look-up table LT, so terminal voltage value Vb rises more, and the open circuit ratio is inferred portion 503 and made electric power storage ratio RS OCo increase more.
In addition, the open circuit ratio is inferred portion 503 and is not limited to use terminal magnitude of voltage Vb and temperature t to infer the example of RSOCo, also can only use terminal magnitude of voltage Vb to infer.
Open circuit decision content Ith can obtain open-circuit voltage as the state of the terminal voltage value Vb of secondary cell 4, promptly in order to judge that in fact current value I c is 0A and pre-set threshold in order to judge to be in, and for example can use the value of degree that 0A is added the detection error of current detecting part 52.The current value of degree that perhaps also can be set in the small current value of the leakage current that flows through when the user does not use equipment side circuit 3 or standby current degree, terminal magnitude of voltage Vb is not caused substantial effect is as open circuit decision content Ith.
The open circuit ratio is inferred portion 503 when being set at the 1st by Correction and Control portion 507 when inferring portion, and electric power storage ratio RS OCo is set at the 1st electric power storage ratio RS OCa and notifies in the ratio of opening a way and infer portion 503.In addition, the open circuit ratio is inferred portion 503 when being set at the 2nd by Correction and Control portion 507 when inferring portion, and electric power storage ratio RS OCo is set at the 2nd electric power storage ratio RS OCb and notifies in the ratio of opening a way and infer portion 503.
The open circuit ratio is inferred portion 503 and is inferred electric power storage ratio RS OCo based on the open-circuit voltage of secondary cell 4; Therefore; Infer portion 506 with the base ratio that the terminal voltage value Vb of the state of the secondary cell 4 of flowing through according to electric current infers electric power storage ratio RS OCr and compare, the precision of inferring of the 1st electric power storage ratio RS OCa and the 2nd electric power storage ratio RS OCb improves.
The ratio that completely charges is inferred portion 504 when sending from charging control section 501 when having reached the notice of full charging, thinks and satisfy full charge condition that the electric power storage ratio RS OCf that is estimated as secondary cell 4 is 100% (ratio: 1).
The ratio that completely charges is inferred portion 504 when being set at the 1st by Correction and Control portion 507 when inferring portion, and electric power storage ratio RS OCf is set at the 1st electric power storage ratio RS OCa and notifies in the open circuit ratio and infer portion 503.In addition, the ratio that completely charges is inferred portion 504 when being set at the 2nd by Correction and Control portion 507 when inferring portion, infers portion's 503 notices to the open circuit ratio and electric power storage ratio RS OCf is set at the 2nd electric power storage ratio RS OCb and notifies in the open circuit ratio and infer portion 503.
The voltage conversion ratio is obtained portion 505 and is used by voltage detection department 51 detected terminal voltage value Vb, by current detecting part 52 detected current value I c and by temperature detecting part 53 detected temperature t, infers the electric power storage ratio RS OCv of secondary cell 4.
Particularly; The voltage conversion ratio is obtained portion 505 when the combination of terminal voltage value Vb, current value I c and temperature t and the combination of corresponding terminal voltage value Vb in look-up table LT, current value I c and degree t are consistent in fact, infers the corresponding RSOC of the combination consistent with this as electric power storage ratio RS OCv.
At this; Because it is with the terminal voltage value Vb mode that the SOC of secondary cell 4 then increases more that rises more that terminal voltage value Vb is corresponding with SOC among the look-up table LT; Therefore, terminal voltage value Vb rises more, and the voltage conversion ratio is obtained portion 505 increases electric power storage ratio RS OCv more.
In addition; In look-up table LT; With with respect to same RSOC current value I c more greatly, promptly on the charging direction current value Ic increase more and on course of discharge the absolute value of current value Ic more little, then the mode that rises more of terminal voltage value Vb makes current value I c corresponding with terminal voltage value Vb.Therefore; The voltage conversion ratio is obtained portion 505 when with current detecting part 52 detected current value I c and voltage detection department 51 detected terminal voltage value Vb and look-up table LT contrast; With the bigger mode that electric power storage ratio SROCv is reduced more of current value I c, infer electric power storage ratio RS OCv.
In addition, in look-up table LT, the mode to descend more with respect to the high more then terminal voltage of same SOC temperature t value Vb makes temperature t corresponding with terminal voltage value Vb.Therefore; The voltage conversion ratio is obtained portion 505 through temperature detecting part 53 detected temperature t and voltage detection department 51 detected terminal voltage value Vb and look-up table LT are contrasted; With the high more mode that electric power storage ratio SROCv is increased more of temperature t, infer electric power storage ratio RS OCv.
So; In look-up table LT; Make with the RSOC of secondary cell 4 have correlationship a plurality of parameters, be that the RSOC of terminal voltage value Vb, current value I c and temperature t and secondary cell 4 is corresponding, therefore, current value I c and temperature t reduce the influence of electric power storage ratio RS OCv; Its result, voltage conversion ratio obtain portion 505 can infer electric power storage ratio RS OCv accurately.
The value of in look-up table LT, setting is a discrete value, with respect to this, by voltage detection department 51 detected terminal voltage value Vb, change continuously by current detecting part 52 detected current value I c and by temperature detecting part 53 detected temperature t.Therefore, the open circuit ratio is inferred portion 503 and voltage conversion ratio and is obtained on the 505 pairs of terminal magnitudes of voltage Vb of portion, current value I c and the temperature t embodiment basis like the approximate processing that rounds up or truncate, contrasts with look-up table LT.So-called " in fact consistent ", the meaning are meant and comprise that as described above be consistent situation to terminal magnitude of voltage Vb, current value I c and temperature t embodiment like the result of approximate processing such as rounding up or truncate.
In addition; The voltage conversion ratio is obtained portion 505 and is not limited to the example that uses terminal magnitude of voltage Vb, current value I c and temperature t to infer electric power storage ratio RS OCv; Also can only use terminal magnitude of voltage Vb to infer; Can also use terminal magnitude of voltage Vb and current value I c to infer, perhaps also can also use terminal magnitude of voltage Vb and temperature t to infer electric power storage ratio RS OCv.
Base ratio is inferred portion 506 and will be obtained the electric power storage ratio RS OCv that portion 505 infers out by the voltage conversion ratio and reach predefined reference value Ref as base condition.And base ratio is inferred portion 506 when electric power storage ratio RS OCv equates with reference value Ref, and the electric power storage ratio RS OCr of secondary cell 4 is estimated as with electric power storage ratio RS OCv, is that reference value Ref equates.
At this, there is the variation with respect to electric power storage ratio RS OC in secondary cell, and the zone that the variable quantity of terminal voltage value Vb is big is that the 1st scope and little zone are the 2nd scope.Thus, obtain electric power storage ratio RS OCv that portion 505 infers out based on terminal voltage value Vb and obtain the electric power storage ratio RS OCv that portion 505 infers out based on terminal voltage value Vb in the 1st scope by the voltage conversion ratio and compare precise decreasing by the voltage conversion ratio in the 2nd scope.
Therefore, if will be set at reference value Ref belonging to the value of selecting among the electric power storage ratio of the 1st scope, then the voltage conversion ratio precision of inferring of obtaining the electric power storage ratio RS OCv of portion 505 improves, and is therefore comparatively desirable.
For example, adopting under the situation of lithium rechargeable battery, RSOC is that the zone below 10% becomes the terminal voltage value Vb zone big with respect to the variable quantity of the variation of electric power storage ratio RS OC, i.e. the 1st scope.Therefore, comparatively it is desirable to, as reference value Ref, the value of using the 1st scope for example 5.5%.
Base ratio is inferred portion 506 when being set at the 1st by Correction and Control portion 507 when inferring portion, and electric power storage ratio RS OCr is set at the 1st electric power storage ratio RS OCa and notifies in the open circuit ratio and infer portion 503.In addition, base ratio is inferred portion 506 when being set at the 2nd by Correction and Control portion 507 when inferring portion, and electric power storage ratio RS OCr is set at the 2nd electric power storage ratio RS OCb and notifies in the open circuit ratio and infer portion 503.
Correction and Control portion 507 infers the open circuit voltage conditions of portion 503, completely charges full charge condition, base ratio that ratio infers portion 504 when inferring any among the base condition of portion 506 when satisfying the open circuit ratio, the portion of inferring that uses this condition that satisfies is set at the 1st infers portion.And; Correction and Control portion 507 infers portion 503 at the ratio of will opening a way and is set at the 1st when inferring portion; The ratio that completely charges is inferred portion 504 and base ratio infers among the portion 506 any and is set at the 2nd and infers portion; And infer portion 504 and base ratio at the ratio that will completely charge and infer among the portion 506 any and be set at the 1st when inferring portion, the ratio of will opening a way is inferred portion 503 and is set at the 2nd and infers portion.
In addition; The 2nd electric power storage ratio RS OCb and full charge capacity correction portion 508 are inferred out when in capacity storage portion 509, having stored new full charge capacity value FCC when the 2nd portion of inferring by Correction and Control portion 507; Will as the 2nd infer portion the portion of inferring be set at the 1st and infer portion; And the 2nd electric power storage ratio RS OCb that this is inferred out is set at the 1st electric power storage ratio RS OCa, thus infer the 1st electric power storage ratio RS OCa that makes new advances, begin inferring of new full charge capacity value FCC once more.In view of the above, Correction and Control portion 507 repeats the correction of full charge capacity value FCC continuously.
Full charge capacity correction portion 508 obtain the 1st portion of inferring infer out the 1st electric power storage ratio RS OCa rise till inferring out the 2nd electric power storage ratio RS OCb to the 2nd portion of inferring during by the aggregate-value of electric current accumulative total portion 502 accumulative totals as difference aggregate-value Qd.Aggregate-value when full charge capacity correction portion 508 is for example deducted the 1st portion of inferring and inferred out the 1st electric power storage ratio RS OCa by the aggregate-value of electric current accumulative total portion 502 accumulative totals when the 2nd electric power storage ratio RS OCb infers out in the 2nd portion of inferring, calculated difference aggregate-value Qd thus.
In addition, if the 1st portion of inferring infer out the 1st electric power storage ratio RS OCa rise till inferring out the 2nd electric power storage ratio RS OCb to the 2nd portion of inferring during will be as difference aggregate-value Qd and totally by the aggregate-value of electric current accumulative total portion 502 accumulative totals.Therefore, during this period, can charge or discharge, do not need continuous discharge or trickle charge.
In addition; Also can outside the electric current accumulative total portion 502 of the RSOC that is used to detect secondary cell 4, also possess another electric current accumulative total portion that the full charge capacity correction is used; Use this electric current accumulative total portion carry out the 1st portion of inferring infer out the 1st electric power storage ratio RS OCa rise till inferring out the 2nd electric power storage ratio RS OCb to the 2nd portion of inferring during the accumulative total of current value I c, thereby obtain difference aggregate-value Qd.
The ratio that full charge capacity correction portion 508 will be represented by the 1st electric power storage ratio RS OCa that the 1st portion of inferring obtains is as the 1st electric power storage ratio R a; The ratio that to be represented by the 2nd electric power storage ratio RS OCb that the 2nd portion of inferring obtains is as the 2nd electric power storage ratio R b; And, calculate new full charge capacity value FCCN based on following formula (1).
Full charge capacity value FCCN=Qd * 1/ (Rb-Ra) ... (1)
And the full charge capacity value FCCN that full charge capacity correction portion 508 will so obtain is stored in the capacity storage portion 509 as new full charge capacity value FCC, thereby revises full charge capacity value FCC.
In addition, full charge capacity value FCC also can revise through following difference correcting mode in full charge capacity correction portion 508, to replace revising based on above-mentioned formula (1) mode of full charge capacity value FCC.
Promptly; As the difference correcting mode; Full charge capacity correction portion 508 uses following formulas (2) to calculate the 1st electric weight QF, and the 1st electric weight QF multiplies each other the full charge capacity value FCCO before the correction that is stored in the capacity storage portion 509 and the 1st electric power storage ratio R a and the product that obtains and the aggregate value of difference aggregate-value Qd.
QF＝FCCO×Ra+Qd ……(2)
In addition, full charge capacity correction portion 508 uses following formula (3) to calculate the 2nd electric weight QS as the product of full charge capacity value FCCO and the 2nd electric power storage ratio.
QS＝FCCO×Rb ……(3)
And said new full charge capacity value FCCN calculates based on following formula (4) in full charge capacity correction portion 508 when Ra＜Rb and QF＜QS; When Ra＜Rb and QF＞QS; Calculate said new full charge capacity value FCCN based on following formula (5), when Ra＞Rb and QF＜QS, calculate said new full charge capacity value FCCN based on following formula (5); When Ra＞Rb and QF＞QS, calculate said new full charge capacity value FCCN based on following formula (4).
Full charge capacity value FCCN=FCCO-{|QS-QF| * (1/|Rb-Ra|) } ... (4)
Full charge capacity value FCCN=FCCO+{|QS-QF| * (1/|Rb-Ra|) } ... (5)
At this; When the 1st electric power storage ratio R a infers out in the 1st portion of inferring; Full charge capacity correction portion 508 is set at FCCO * Ra the electric power storage electric weight Q of electric current accumulative total portion 502; Electric current accumulative total portion 502 proceeds the accumulative total with respect to the current value I c of this electric power storage electric weight Q, and therefore the electric power storage electric weight Q in the time of then can directly using the 2nd portion of inferring to infer out the 2nd electric power storage ratio R b can simplify processing as the 1st electric weight QF.
In addition; The value of electric power storage electric weight Q is used as the presumed value (detected value) of the electric power storage electric weight of secondary cell 4; Therefore when the 1st electric power storage ratio R a infers out in the 1st portion of inferring, FCCO * Ra is set at electric power storage electric weight Q, thus can improve secondary cell 4 the electric power storage electric weight infer precision.
In addition; The 1st electric power storage ratio R a and the 1st electric power storage ratio RS OCa, the 2nd electric power storage ratio R b and the 2nd electric power storage ratio RS OCb are that the technique of expression of ratio differs from one another; The ratio that its expression is identical is therefore, of equal value each other between the 1st electric power storage ratio, between the 2nd electric power storage ratio.Therefore, also can replace " 1/ (Rb-Ra) " in the formula (1) and adopt 100/ (RSOCb-RSOCa), can certainly replace " 1/|Rb-Ra|) " in formula (4), the formula (5) and adopt 100/|RSOCb-RSOCa|).At this moment, " 1/|Rb-Ra|) " in " 1/ (Rb-Ra) " in the formula (1), " 100/ (RSOCb-RSOCa) ", formula (4), the formula (5), " 100/|RSOCb-RSOCa|) " are equivalent to an example of " difference aggregate-value, the 1st electric power storage ratio and the difference of the 2nd electric power storage ratio and 1 ratio ".
Action in the face of full charge capacity correction circuit 5 shown in Figure 1 describes down.Fig. 4 to Fig. 8 is the process flow diagram of an example of the action of expression full charge capacity correction circuit 5 shown in Figure 1.
At first, detect the current value I c of the secondary cell 4 of flowing through by current detecting part 52, by voltage detection department 51 detection terminal magnitude of voltage Vb, by temperature detecting part 53 detected temperatures t (step S1).Then, press time per unit accumulative total current value I c, calculate the electric power storage electric weight Q (step S2) that charges into secondary cell 4 by electric current accumulative total portion 502.Then, obtain portion 505 according to current value I c, terminal voltage value Vb and temperature t, infer and obtain electric power storage ratio RS OCv (step S3) by the voltage conversion ratio.
Step S1 to S3 walks abreast with following processing and carries out all the time, and current value I c, terminal voltage value Vb, temperature t, electric power storage electric weight Q and electric power storage ratio RS OCv are updated to up-to-date value all the time.
Next, compare the absolute value and open circuit decision content Ith (step S4) of current value I c by Correction and Control portion 507, confirm open circuit voltage conditions.And; When the absolute value of current value I c does not satisfy open circuit voltage conditions for opening a way more than the decision content Ith (being " denying ") at step S4; Correction and Control portion 507 confirms to have or not the notice from the full charging of charging control section 501, confirms full charge condition (step S5).
And when not not satisfying full charge condition from the notice of the full charging of charging control section 501 (be " deny " at step S5), Correction and Control portion 507 compares electric power storage ratio RS OCv and reference value Ref, affirmation base condition (step S6).And, when electric power storage ratio RS OCv and reference value Ref inconsistent and when not satisfying base condition, be transferred to step S4.
More than, repeated execution of steps S4 to S6 is till any of open circuit voltage conditions, full charge condition and base condition is met.And,, the absolute value of current value I c (is " being ") when satisfying open circuit voltage conditions less than open circuit decision content Ith at step S4, Correction and Control portion 507 sets the open circuit ratios and infers portion 503 and the 1st infer portion, and is transferred to step S7.
Then, the electric power storage electric weight Q in the time of will satisfying open circuit voltage conditions by Correction and Control portion 507 for example is stored in as aggregate-value Q (1) among the RAM (step S7).
Then, inferring portion 503 by the open circuit ratio is terminal voltage value Vb and temperature t according to the open-circuit voltage (OCV: (Open circuit voltage)) of secondary cell 4, infers electric power storage ratio RS OCo (step S8).Further, infer portion 503 by the open circuit ratio electric power storage ratio RS OCo is made as the 1st electric power storage ratio RS OCa.Because electric power storage ratio RS OCo representes ratio with percent, therefore it is rewritten as ratio and is set at the 1st electric power storage ratio R a (step S9).
At this moment, infer portion 503 by the open circuit ratio and infer the 1st electric power storage ratio R a of the secondary cell 4 when satisfying open circuit voltage conditions based on the open-circuit voltage of secondary cell 4, therefore, the 1st electric power storage ratio R a is the presumed value of the high electric power storage ratio of precision.
Then, carry out and the same processing of step S4 to S6 at step S21 to S23, and repeated execution of steps S21 to S23, till any of open circuit voltage conditions, full charge condition and base condition is met once more by Correction and Control portion 507.
And,, the absolute value of current value I c (is " being ") when satisfying open circuit voltage conditions less than open circuit decision content Ith at step S21, Correction and Control portion 507 sets the open circuit ratios and infers portion 503 and the 2nd infer portion, and is transferred to step S24.
Then, Correction and Control portion 507 for example will the electric power storage electric weight Q when step S21 satisfies open circuit voltage conditions be stored in as aggregate-value Q (2) among the RAM (step S24).
And inferring portion 503 by the open circuit ratio is terminal voltage value Vb and temperature t according to the open-circuit voltage of secondary cell 4, infers electric power storage ratio RS OCo (step S25).Further, the open circuit ratio is inferred portion 503 electric power storage ratio RS OCo is made as the 2nd electric power storage ratio RS OCb.Because electric power storage ratio RS OCo representes ratio with percent, therefore it is rewritten as ratio and is set at the 2nd electric power storage ratio R b (step S26).
At this moment, infer the 2nd electric power storage ratio R b of the secondary cell 4 when satisfying open circuit voltage conditions because the open circuit ratio is inferred portion 503 based on the open-circuit voltage of secondary cell 4, therefore, the 2nd electric power storage ratio R b is the presumed value of the high electric power storage ratio of precision.
Next; For after then carry out the correction of full charge capacity value FCC repeatedly after the correction of the full charge capacity value FCC that states; Correction and Control portion 507 will as the 2nd infer portion the open circuit ratio infer portion 503 and be set at the new the 1st and infer portion (step S27), and be transferred to step S41.
In addition; So-called " be set at new the 1st infer portion " do not followed concrete processing; But the 2nd electric power storage ratio R b that will infer out is as the 1st electric power storage ratio R a of next correcting process, thus conceptually illustrate as the 2nd infer portion the portion of inferring be equivalent to the 1st of next correcting process and infer portion.
At step S41, Correction and Control portion 507 deducts aggregate-value Q (1) from aggregate-value Q (2) and comes calculated difference aggregate-value Qd (step S41).Thus, difference aggregate-value Qd is for after step S4 secondary cell 4 satisfies open circuit voltage conditions, through discharging and recharging once more till step S21 satisfies open circuit voltage conditions during in, the variable quantity of the electric power storage electric weight Q of secondary cell 4.
Then, full charge capacity correction portion 508 is based on the 1st electric power storage ratio R a, the 2nd electric power storage ratio R b and the difference aggregate-value Qd that as above obtain, and use formula (1) is calculated full charge capacity value FCCN (step S42).Then, full charge capacity correction portion 508 is through being stored in full charge capacity value FCCN in the capacity storage portion 509 as new full charge capacity value FCC, thereby revises full charge capacity value FCC (step S43).
At this; Because the electric power storage electric weight the when method that patent documentation 1 is put down in writing need be calculated the charging beginning based on the full charge capacity before revising; If the electric power storage electric weight when therefore existing based on this charging beginning carries out the correction of full charge capacity, the part of the error that full charge capacity comprised before then revising also can remain in the problem in the revised full charge capacity.
But; Since formula (1) can based on revise before full charge capacity the difference aggregate-value Qd, the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b that irrespectively obtain calculate new full charge capacity value FCCN, can not comprise the error of the full charge capacity before revising in the therefore new modified value.Its result compares with the method that patent documentation 1 is put down in writing, and the correction precision of full charge capacity value FCC can improve in full charge capacity correction portion 508.
In addition; As stated, infer portion 506 with base ratio and compare, the open circuit ratio infer portion 503 the electric power storage ratio infer the precision height; Therefore; Infer portion and the 2nd when inferring portion when using the open circuit ratio to infer portion 503 as described above as the 1st, infer the situation that portion 506 infers with among the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b any through base ratio and compare, the correction precision of full charge capacity value FCC improves.
Then, in order to continue to carry out repeatedly the correction of full charge capacity value FCC, Correction and Control portion 507 is made as the 1st electric power storage ratio R a with the 2nd electric power storage ratio R b, and aggregate-value Q (1) is made as aggregate-value Q (2) (step S44), is transferred to step S21 once more.
Then, the 507 repeated execution of steps S21 to S23 of Correction and Control portion are till any of open circuit voltage conditions, full charge condition and base condition is met once more.
And; When satisfying full charge condition from the notice of the full charging of charging control section 501 (is " being " at step S22); Correction and Control portion 507 ratio that will completely charge is inferred portion 504 and is made as the 2nd and infers portion, obtains electric power storage electric weight Q when satisfying full charge condition as aggregate-value Q (2) (step S28).
Thus, because of secondary cell 4 is full charging, so the ratio that completely charges is inferred portion 504 and inferred the 2nd electric power storage ratio R b and be " 1 ", the 2nd electric power storage ratio RS OCb is 100% (step S29).Then; For after then carry out the correction of full charge capacity value FCC after the correction of the full charge capacity value FCC that states repeatedly; Correction and Control portion 507 will as the 2nd infer portion full charging ratio infer portion 504 and be made as the new the 1st and infer portion (step S30), and be transferred to step S61.
In addition; When execution in step S21 to S23 repeatedly; Satisfy base condition (being " being ") at step S23 if electric power storage ratio RS OCv is consistent with reference value Ref; Then Correction and Control portion 507 infers portion 506 with base ratio and is made as the 2nd and infers portion, obtains electric power storage electric weight Q when satisfying base condition as aggregate-value Q (2) (step S31).
Thus, because of the electric power storage ratio RS OCv of secondary cell 4 equates with reference value Ref (%), so base ratio is inferred portion 506 the 2nd electric power storage ratio RS OCb is made as reference value Ref (%).Because reference value Ref (%) representes ratio with percent, therefore it is rewritten as ratio and is set at the 2nd electric power storage ratio R b (step S32).
Then, for after the correction of full charge capacity value FCC, then carrying out the correction of full charge capacity value FCC repeatedly, Correction and Control portion 507 will as the 2nd infer portion base ratio infer portion 506 and be made as the new the 1st and infer portion (step S33), and be transferred to step S51.
Next; In step S51 to S54, carry out and the same processing of step S41 to S44; Revise full charge capacity value FCC, and, the 2nd electric power storage ratio R b is made as the 1st electric power storage ratio R a in order then to carry out the correction of full charge capacity value FCC repeatedly continuously; Aggregate-value Q (1) is made as aggregate-value Q (2), and is transferred to step S61 from step S54.
At this moment, the same at step S52 with step S42, compare with the method that patent documentation 1 is put down in writing, the correction precision of full charge capacity value FCC can improve in full charge capacity correction portion 508.
Describe in the face of the later action of step S61 down.When being transferred to step S61; Use the ratio that completely charges infer portion 504 and base ratio infer among the portion 506 any as by the 1st infer portion, or the 2nd portion of inferring be reset to the new the 1st and infer the 1st of portion and infer portion; When satisfying charge condition; Perhaps when satisfying base condition, be estimated as the 1st electric power storage ratio R a (comprise after resetting by the 2nd electric power storage ratio R b the 1st electric power storage ratio R a).
Therefore, at step S61, be set at the 2nd and infer portion in order next must the open circuit ratio to be inferred portion 503, execution in step S61 repeatedly is till satisfying open circuit voltage conditions.In view of the above, infer among the portion 506 any when inferring portion, must use the open circuit ratio to infer portion 503 and infer portion as the 2nd as the 1st when using the ratio that completely charges to infer portion 504 and base ratio.Therefore, must use the open circuit ratio to infer portion 503 infers portion and the 2nd as the 1st and infers at least one among the portion.
At this; Ratio is inferred portion 504 and when secondary cell 4 is not completely charged, can't be inferred the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b owing to completely charge; Therefore the chance that can infer the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b is few, and the chance that causes revising full charge capacity value FCC is few.
In addition, as stated, infer portion 503 and compare with the open circuit ratio, base ratio infer 506 pairs the 1st electric power storage ratio R a of portion and the 2nd electric power storage ratio R b to infer precision low, therefore when the use base ratio is inferred portion 506, the correction precise decreasing of full charge capacity value FCC.In addition; If the user do not make secondary cell 4 discharge up to the electric power storage ratio RS OCv of secondary cell 4 reach for example be set to the reference value Ref below 10% till; Base ratio is inferred portion 506 just can't infer the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b; Therefore the chance that can infer the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b is few, and the chance that causes revising full charge capacity value FCC is few.
Relative therewith, if power switch of user's off device etc. and the charging and discharging currents of secondary cell 4 is essentially 0 for example, the ratio of then opening a way is inferred portion 503 just can infer the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b.Therefore, infer portion 504 or base ratio with the ratio that completely charges and infer portion 506 and compare, the open circuit ratio is inferred portion 503, and to infer the chance of the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b many.In addition, infer portion 506 with base ratio and compare, the open circuit ratio is inferred the precision height that the 1st electric power storage ratio R a and the 2nd electric power storage ratio R b infer in portion 503.
Therefore; Through step S61; Using the open circuit ratio to infer portion 503 infers portion and the 2nd as the 1st and infers at least one among the portion; Thereby can increase the straightener meeting of full charge capacity value FCC, and infer with base ratio and to compare when portion 506 infers the 1st electric power storage ratio R a with the 2nd electric power storage ratio R b, can improve the correction precision of full charge capacity value FCC.
And,, the absolute value of current value I c (is " being ") when satisfying open circuit voltage conditions less than open circuit decision content Ith at step S61, Correction and Control portion 507 ratio of will opening a way is inferred portion 503 and is made as the 2nd and infers portion, and is transferred to step S62.Below, carry out and the same processing of step S24 to S27 at step S62 to S65, carry out and the same processing of step S41 to S44 at step S66 to S69.
In view of the above; Revise full charge capacity value FCC, and, the 2nd electric power storage ratio R b is made as the 1st electric power storage ratio R a in order then to carry out the correction of full charge capacity value FCC repeatedly continuously; Aggregate-value Q (1) is made as aggregate-value Q (2), and is transferred to step S21 once more from step S69.
At this moment, the same at step S67 with step S42, compare with the method that patent documentation 1 is put down in writing, the correction precision of full charge capacity value FCC can improve in full charge capacity correction portion 508.
In addition, must not carry out the correction of full charge capacity value FCC continuously repeatedly.For example, also not execution in step S27, S44 are transferred to step S1 from step S43.In addition, execution in step S30, S33, S54 are not transferred to step S1 from step S53.In addition, also not execution in step S65, S69 are transferred to step S1 from step S68.
On the other hand; When in order to keep watch on open circuit voltage conditions, full charge condition and base condition repeatedly during execution in step S4 to S6; If have from the notice of the full charging of charging control section 501 and satisfy full charge condition (being " being ") at step S5; Then Correction and Control portion 507 ratio that will completely charge is inferred portion 504 and is made as the 1st and infers portion, obtains electric power storage electric weight Q when satisfying full charge condition as aggregate-value Q (1) (step S10).
Thus, because secondary cell 4 reaches full charging, therefore, the ratio that completely charges is inferred portion 504 and is inferred the 1st electric power storage ratio R a and be " 1 ", and the 1st electric power storage ratio RS OCa is 100% (step S11), and is transferred to step S61.
In addition; When execution in step S4 to S6 repeatedly; Satisfy base condition (being " being ") at step S6 if electric power storage ratio RS OCv is consistent with reference value Ref; Then Correction and Control portion 507 infers portion 506 with base ratio and is made as the 1st and infers portion, obtains electric power storage electric weight Q when satisfying base condition as aggregate-value Q (1) (step S12).
Thus, because of the electric power storage ratio RS OCv of secondary cell 4 equates with reference value Ref (%), so base ratio is inferred portion 506 the 1st electric power storage ratio RS OCa is made as reference value Ref (%).Because reference value Ref (%) representes ratio with percent, therefore it is rewritten as ratio and is set at the 1st electric power storage ratio R a (step S13), and be transferred to step S61.
Because the later action of step S61 as stated, therefore omit its explanation.
Fig. 9, Figure 10 are used to explain use the open circuit ratio to infer portion 503 as the 1st portion of inferring and use the ratio that completely charges to infer the key diagram of the modification method of the full charge capacity value FCC of portion 504 when inferring portion as the 2nd.The longitudinal axis of Fig. 9, Figure 10 is represented RSOC, the transverse axis express time process of secondary cell 4.Fig. 9 representes the example when negative direction correction full charge capacity value FCC, and Figure 10 representes the example when positive dirction correction full charge capacity value FCC.
At first, satisfy open circuit voltage conditions at the A of the moment of Fig. 9 T1 point, the open circuit ratio is inferred portion 503, and to infer the 1st electric power storage ratio R a be 0.2 (the 1st electric power storage ratio RS OCa is 20%).At this moment, establishing full charge capacity value FCCO is 4000mAh.
Next, satisfy full charge condition at moment T2, the ratio that completely charges is inferred portion 504, and to infer the 2nd electric power storage ratio R b be 1 (the 2nd electric power storage ratio RS OCb is 100%) (B1 point).At this moment, establishing difference aggregate-value Qd is 3000mAh.
Thus, according to formula (1), revised full charge capacity value FCCN does
FCCN＝3000×1/(1-0.2)＝3750mAh。
On the other hand, when the difference correcting mode of use formula (2) to formula (5) calculates full charge capacity value FCCN,
QF＝4000×0.2+3000＝3800mAh
QS＝4000×1＝4000mAh
Because Ra＜Rb and QF＜QS, so use formula (4) then does
FCCN＝4000-{|4000-3800|×(1/|1-0.2|)}＝3750mAh。
In Fig. 9, at moment T2, through revising full charge capacity value FCC, the RSOC that control part 50 use formulas (A) are calculated (to the RSOC of equipment side circuit 3 notices) moves to the B1 point from the B2 point.The processing that so, RSOC will be changed is called JUMP and handles (jump and handle).
Next, with reference to Figure 10, be the same with A point among Fig. 9 at first at the A of moment T1 point.Next, satisfy full charge condition at moment T2, the ratio that completely charges is inferred portion 504, and to infer the 2nd electric power storage ratio R b be 1 (the 2nd electric power storage ratio RS OCb is 100%) (B1 point).At this moment, establishing difference aggregate-value Qd is 3400mAh.
Thus, according to formula (1), revised full charge capacity value FCCN does
FCCN＝3400×1/(1-0.2)＝4250mAh。
On the other hand, when the difference correcting mode of use formula (2) to formula (5) calculates full charge capacity value FCCN,
QF＝4000×0.2+3400＝4200mAh
QS＝4000×1＝4000mAh
Because Ra＜Rb and QF＞QS, so use formula (5) then does
FCCN＝4000+{|4000-4200|×(1/|1-0.2|)}＝4250mAh。
In Figure 10, at moment T3, the RSOC that control part 50 use formulas (A) are calculated surpasses 100%.But original RSOC can not surpass 100%, and therefore about during from moment T3 to moment T2, control part 50 is fixed as 100% and to equipment side circuit 3 notices with RSOC.To be fixed as 100% processing as described above to the value of the RSOC of equipment side circuit 3 notice is called KEEP and handles (keeping processing).
So; When adopting the difference correcting mode; Though the full charge capacity value FCCO before in the calculating of full charge capacity value FCCN, use revising, the result is the error concealment that comprises among the full charge capacity value FCCO, identical full charge capacity value FCCN when obtaining with use formula (1).Therefore, even under the situation of using the difference correcting mode, same modified value in the time of also accessing with use formula (1) is therefore compared with the method that patent documentation 1 is put down in writing, and the correction precision of full charge capacity value FCC can improve in full charge capacity correction portion 508.
Figure 11, Figure 12 are used to explain that using the open circuit ratio to infer portion 503 infers portion as the 1st and use base ratio to infer the key diagram of the modification method of the full charge capacity value FCC of portion 506 when inferring portion as the 2nd.The longitudinal axis of Figure 11, Figure 12 is represented RSOC, the transverse axis express time process of secondary cell 4.Figure 11 representes the example when negative direction correction full charge capacity value FCC, and Figure 12 representes the example when positive dirction correction full charge capacity value FCC.
At first, with reference to Figure 11, satisfy open circuit voltage conditions at the C of moment T4 point, the open circuit ratio is inferred portion 503, and to infer the 1st electric power storage ratio R a be 0.6 (the 1st electric power storage ratio RS OCa is 60%).Full charge capacity value FCCO is made as 4000mAh.
Next, T5 satisfies base condition in the moment, and base ratio is inferred portion 506, and to infer the 2nd electric power storage ratio RS OCb be reference value Ref (=5.5%), and the 2nd electric power storage ratio R b is Ref/100 (=0.055) (a D1 point).At this moment, establishing difference aggregate-value Qd is-2000mAh.
Thus, according to formula (1), revised full charge capacity value FCCN does
FCCN＝-2000×1/(0.055-0.6)＝3670mAh。
On the other hand, when the difference correcting mode of use formula (2) to formula (5) calculates full charge capacity value FCCN,
QF＝4000×0.6-2000＝400mAh
QS＝4000×0.055＝220mAh
Because Ra＞Rb and QF＞QS, so use formula (4) then does
FCCN＝4000-{|220-400|×(1/|0.055-0.6|)}＝3670mAh。In Figure 11, carry out JUMP at moment T5 and handle.
Next, with reference to Figure 12, the C point of T4 is the same with C point among Figure 11 at first constantly.Next, T5 satisfies base condition in the moment, and base ratio is inferred portion 506, and to infer the 2nd electric power storage ratio RS OCb be reference value Ref (=5.5%), and the 2nd electric power storage ratio R b is Ref/100 (=0.055) (a D1 point).At this moment, establishing difference aggregate-value Qd is-2360mAh.
Thus, according to formula (1), revised full charge capacity value FCCN does
FCCN＝-2360×1/(0.055-0.6)＝4330mAh。
On the other hand, when the difference correcting mode of use formula (2) to formula (5) calculates full charge capacity value FCCN,
QF＝4000×0.6-2360＝40mAh
QS＝4000×0.055＝220mAh
Because Ra＞Rb and QF＜QS, so use formula (5) then does
FCCN＝4000+{|220-40|×(1/|0.055-0.6|)}＝4330mAh。In Figure 12, carry out KEEP at moment T6 to T5 and handle.
So; Even infer portion as the 1st and use base ratio to infer and use under the situation of difference correcting mode when portion is inferred as the 2nd by portion 506 using the open circuit ratio to infer portion 503; Same modified value in the time of also accessing with use formula (1); Therefore compare with the method that patent documentation 1 is put down in writing, the correction precision of full charge capacity value FCC can improve in full charge capacity correction portion 508.
Figure 13, Figure 14 be used to explain use the open circuit ratio infer portion 503 as the 1st infer the modification method of the full charge capacity value FCC of portion and the 2nd when inferring portion key diagram.The longitudinal axis of Figure 13, Figure 14 is represented RSOC, the transverse axis express time process of secondary cell 4.Figure 13 representes the example when negative direction correction full charge capacity value FCC, and Figure 14 representes the example when positive dirction correction full charge capacity value FCC.
At first, satisfy open circuit voltage conditions at the E of moment T7 point, the open circuit ratio is inferred portion 503, and to infer the 1st electric power storage ratio R a be 0.6 (the 1st electric power storage ratio RS OCa is 60%).If full charge capacity value FCCO is 4000mAh.
Next, T8 satisfies open circuit voltage conditions in the moment, and the open circuit ratio is inferred portion 503, and to infer the 2nd electric power storage ratio R b be 0.1 (the 2nd electric power storage ratio RS OCb is 10%) (F1 point).At this moment, establishing difference aggregate-value Qd is-1800mAh.
Thus, according to formula (1), revised full charge capacity value FCCN does
FCCN＝-1800×1/(0.1-0.6)＝3600mAh。
On the other hand, when the difference correcting mode of use formula (2) to formula (5) calculates full charge capacity value FCCN,
QF＝4000×0.6-1800＝600mAh
QS＝4000×0.1＝400mAh
Because Ra＞Rb and QF＞QS, so use formula (4) then does
FCCN＝4000-{|400-600|×(1/|0.1-0.6|)}＝3600mAh。In Figure 13, carry out JUMP at moment T8 and handle.
Next, with reference to Figure 14, the E point of T7 is the same with E point among Figure 13 at first constantly.Next, T8 satisfies open circuit voltage conditions in the moment, and the open circuit ratio is inferred portion 503, and to infer the 2nd electric power storage ratio R b be 0.1 (the 2nd electric power storage ratio RS OCb is 10%) (F1 point).At this moment, establishing difference aggregate-value Qd is-2200mAh.
Thus, revised full charge capacity value FCCN according to formula (1) does
FCCN＝-2200×1/(0.1-0.6)＝4400mAh。
On the other hand, when the difference correcting mode of use formula (2) to formula (5) calculates full charge capacity value FCCN,
QF＝4000×0.6-2200＝200mAh
QS＝4000×0.1＝400mAh
Because Ra＞Rb and QF＜QS, so use formula (5) then does
FCCN＝4000+{|400-200|×(1/|0.1-0.6|)}＝4400mAh。In Figure 14, carry out JUMP at moment T8 and handle.
So; Even inferring portion 503 at the ratio of will opening a way infers portion and the 2nd as the 1st and uses when inferring portion under the situation of difference correcting mode; Same modified value in the time of also accessing with use formula (1); Therefore compare with the method that patent documentation 1 is put down in writing, the correction precision of full charge capacity value FCC can improve in full charge capacity correction portion 508.
In addition; Show as the portion of inferring and to comprise that the open circuit ratio is inferred portion 503, completely the ratio that charges is inferred the example that portion 504 and base ratio are inferred portion 506; But can not comprise that also base ratio infers portion 506; And comprise that the open circuit ratio infers portion 503 and the ratio that completely charges is inferred portion 504, with the ratio of opening a way infer portion 503 as the 1st infer that portion and the 2nd infers portion one of them infer portion, the ratio that will completely charge is inferred portion 504 and is inferred portion as another.
In addition; Can also not comprise that full charging ratio infers portion 504; And comprise that the open circuit ratio infers portion 503 and infer portion 506 with base ratio, with the open circuit ratio infer portion 503 as the 1st infer that portion and the 2nd infers portion one of them infer portion, base ratio is inferred portion 506 infers portion as another.
In addition, can also not comprise that also full charging ratio infers portion 504 and infer portion 506 with base ratio, and the ratio that will completely charge is inferred portion 504 and is inferred portion and the 2nd as the 1st and infer portion.
In addition, infer the portion of inferring that portion 503 combination uses with the open circuit ratio and be not limited to full charging ratio and infer portion 504 and infer portion 506, also can infer the electric power storage ratio of secondary cell 4 through additive method with base ratio.
That is, full charge capacity correction circuit involved in the present invention comprises: accumulative total portion, calculate aggregate-value through the flow through current value of electric current of secondary cell of accumulative total; Capacity storage portion, the full charge capacity value of the full charge capacity of the said secondary cell of storage representation; The 1st infers portion; When the inferred condition that satisfies as the condition that can infer the electric power storage ratio; The electric power storage ratio of said secondary cell is estimated as the 1st electric power storage ratio; Wherein, said electric power storage ratio is to accumulate electric power storage electric weight in said secondary cell with respect to the ratio of the full charge capacity of the reality of this secondary cell; The 2nd infers portion; After said the 1st electric power storage ratio by said the 1st portion of inferring; Keep watch on and whether to satisfy, when satisfying this and can infer condition, the electric power storage ratio of the said secondary cell of this moment is estimated as the 2nd electric power storage ratio as the inferred condition that can infer the condition of said electric power storage ratio; Full charge capacity correction portion; Based on difference aggregate-value and the difference of said the 1st electric power storage ratio and said the 2nd electric power storage ratio and 1 ratio; Infer the full charge capacity value of said secondary cell; Be stored in said capacity storage portion through full charge capacity value that this is inferred as new full charge capacity value and revise the full charge capacity value; Wherein, said difference aggregate-value in said the 1st portion of inferring said the 1st electric power storage ratio rise till said the 2nd electric power storage ratio to said the 2nd portion of inferring during by said accumulative total portion aggregate-value totally; The open circuit ratio is inferred portion; With open circuit voltage conditions as the said condition of inferring; When satisfying this open circuit voltage conditions; Infer the electric power storage ratio of said secondary cell based on the terminal voltage of said secondary cell, wherein, whether said open circuit voltage conditions is being open-circuit voltage and predefined open circuit decision content is a condition when the electric current of the said secondary cell of flowing through less than the terminal voltage that is used to judge this secondary cell; And Correction and Control portion, infer portion and the said the 2nd with the said the 1st and infer in the portion at least one and be set at said open circuit ratio and infer portion.
According to this structure, when the condition that satisfies the electric power storage ratio that can infer secondary cell can be inferred condition, the electric power storage ratio of this secondary cell by the 1st portion of inferring was as the 1st electric power storage ratio.And; After the 1st electric power storage ratio is inferred out by the 1st portion of inferring; Whether kept watch on by the 2nd portion of inferring and to satisfy and said identical or different the inferred condition of condition of inferring, when satisfying this and can infer condition, the electric power storage ratio of secondary cell of inferring this moment is as the 2nd electric power storage ratio.
At this, the difference of the 1st electric power storage ratio and the 2nd electric power storage ratio is to produce according to the electric weight that is equivalent to the difference aggregate-value.And, full charge capacity value and ratio " 1 ", promptly 100% corresponding.Therefore, full charge capacity correction portion can be ratio and difference aggregate-value between 1 according to the difference and the pairing ratio of full charge capacity value of the 1st electric power storage ratio and said the 2nd electric power storage ratio, infers the full charge capacity value of secondary cell.Full charge capacity correction portion is through infer revised full charge capacity value as described above; Thereby can not revised the influence of the error that comprises in the preceding full charge capacity value and revised the full charge capacity value; Its result compares the correction precision that can improve full charge capacity with the method that patent documentation 1 is put down in writing.
And the open circuit ratio is inferred the terminal voltage of the secondary cell of portion when satisfying said open circuit voltage conditions, the open-circuit voltage of this secondary cell is inferred the electric power storage ratio of said secondary cell.The open-circuit voltage of secondary cell is the electromotive force of secondary cell itself; The electromotive force of secondary cell determines according to the electric power storage ratio of secondary cell, and the open circuit ratio portion of inferring of therefore inferring the electric power storage ratio based on open-circuit voltage can infer the electric power storage ratio of secondary cell accurately.In addition, the flow through electric current of secondary cell is high less than the possibility that the open circuit voltage conditions of open circuit decision content for example is met when the user breaks off the switch etc. of the equipment that uses this secondary cell.Therefore, can think and completely charge with secondary cell or the chance of discharge is fully compared that the chance that open circuit voltage conditions is met is more.
Therefore, Correction and Control portion will be that the open circuit ratio portion of inferring of condition is made as the 1st and infers portion and the 2nd and infer at least one among the portion to satisfy open circuit voltage conditions, thereby can increase the chance of inferring of electric power storage ratio.And, if the chance of inferring of electric power storage ratio increases the straightener meeting that then can increase full charge capacity.In view of the above, can increase the straightener meeting of full charge capacity, and compare, can improve the correction precision of full charge capacity with the method that patent documentation 1 is put down in writing.
In addition, comparatively it is desirable to, also comprise: the test section that completely charges, detect said secondary cell and reach full charging; And
The ratio that completely charges is inferred portion; The full charge condition of expiring the condition of being charged as that use detects said secondary cell with the said test section that completely charges is as the said condition of inferring, should be full during charge condition when satisfying, and the electric power storage ratio that is estimated as said secondary cell is 1; Wherein, Said Correction and Control portion, with the said open circuit ratio portion of inferring be set at the said the 1st infer that portion and the said the 2nd infers portion one of them infer portion, and the said ratio portion of inferring of completely charging be set at another infer portion.
According to this structure, the test section that completely charges detects secondary cell and reaches full charging.Thus, when satisfying above-mentioned full charge condition, mean that then the electric power storage ratio of secondary cell almost positively reaches 1 (100%).Therefore, the ratio that completely charges is inferred portion when satisfying charge condition, and the electric power storage ratio that is estimated as secondary cell is 1 (100%), thereby can infer the electric power storage ratio with very high degree of precision.
Therefore; Correction and Control portion will open a way the ratio portion of inferring be made as the 1st infer that portion and the 2nd infers portion one of them infer portion; And the ratio portion of inferring of will completely charging is made as another and infers portion; Thereby the high full charging ratio of precision of inferring of combination electric power storage ratio is inferred the open circuit ratio portion of inferring of inferring chance and Duoing than the ratio portion of inferring of completely charging of portion and electric power storage ratio and is revised full charge capacity, is easy to balancedly take into account the raising of correction precision and the increase that straightener is understood thus.
In addition, comparatively it is desirable to, also comprise: the voltage conversion ratio is obtained portion, based on the terminal voltage of said secondary cell, obtains the electric power storage ratio of said secondary cell; And base ratio is inferred portion; The base condition that the electric power storage ratio that uses the said voltage conversion ratio portion of obtaining reaches predefined reference value is as the said condition of inferring, and when satisfying this base condition, the electric power storage ratio that is estimated as said secondary cell is said reference value; Wherein, Said Correction and Control portion, with the said open circuit ratio portion of inferring be set at the said the 1st infer that portion and the said the 2nd infers portion one of them infer portion, and the said base ratio portion of inferring be set at another infer portion.
The terminal voltage of secondary cell changes according to the electric power storage ratio.Utilize this character, the voltage conversion ratio is obtained portion and is obtained the electric power storage ratio based on the terminal voltage of secondary cell.And; When the electric power storage ratio that when the voltage conversion ratio portion of obtaining is consistent with reference value; The electric power storage ratio of this secondary cell equates with this reference value, so the base ratio portion of inferring is directly with the electric power storage ratio of reference value as secondary cell, thereby can infer the electric power storage ratio of secondary cell.Thus, through the electric power storage ratio that reference value suitably is set at and expires charging or discharge different fully, thereby, also can infer the electric power storage ratio of secondary cell, so the chance of inferring of electric power storage ratio increases even do not carry out full charging or discharge fully.
Therefore; Correction and Control portion will open a way the ratio portion of inferring be made as the 1st infer that portion and the 2nd infers portion one of them infer portion; And the base ratio portion of inferring is made as another infers portion; Thereby full charge capacity is revised with the open circuit ratio portion of inferring of inferring chance and Duo than the ratio portion of inferring of completely charging of inferring precision height and electric power storage ratio that compares the electric power storage ratio with the base ratio portion of inferring by the many base ratios of the chance portion of inferring of inferring of combination electric power storage ratio, is easy to balancedly take into account the raising of correction precision and the increase that straightener is understood thus.
In addition, comparatively it is desirable to, also comprise: the test section that completely charges, detect said secondary cell and reach full charging; The ratio that completely charges is inferred portion, uses the full charge condition of expiring the condition of being charged as that detects said secondary cell with the said test section that completely charges as the said condition of inferring, and when satisfied this expired charge condition, the electric power storage ratio that is estimated as said secondary cell was 1; The voltage conversion ratio is obtained portion, based on the terminal voltage of said secondary cell, obtains the electric power storage ratio of said secondary cell; And base ratio is inferred portion; The base condition that the electric power storage ratio that uses the said voltage conversion ratio portion of obtaining reaches predefined reference value is as the said condition of inferring; When satisfying this base condition; The electric power storage ratio that is estimated as said secondary cell is said reference value, wherein, and said Correction and Control portion; When satisfying said open circuit voltage conditions, said any that expires in charge condition and the said base condition; With using with this condition that satisfies is that the said portion of inferring of inferring condition is set at the said the 1st and infers portion, when the said open circuit ratio portion of inferring being set at the 1st when inferring portion, this open circuit ratio being inferred portion, the said ratio that completely charges infer portion and said base ratio any portion of inferring in the portion of inferring and be set at the said the 2nd and infer portion; When portion and said base ratio any portion of inferring in the portion of inferring that the said ratio that completely charges is inferred is set at the 1st when inferring portion, the said open circuit ratio portion of inferring is set at the said the 2nd infers portion.
According to this structure, during among satisfying open circuit voltage conditions, full charge condition and base condition any, Correction and Control portion will be made as the 1st as the portion of inferring that can infer condition with this condition that satisfies and infer portion, thus the electric power storage ratio infer the chance increase.In addition; Correction and Control portion is made as the 1st when inferring portion when the ratio portion of inferring that will open a way; With the open circuit ratio infer portion, completely the ratio that charges is inferred portion and base ratio any portion of inferring among the portion of inferring and is made as the 2nd and infers portion; Infer portion and base ratio any portion of inferring among the portion of inferring when the ratio that will completely charge and be made as the 1st when inferring portion, the ratio portion of inferring that will open a way is made as the 2nd and infers portion.Its result; The precision of inferring of electric power storage ratio is higher than base ratio and infers the open circuit ratio portion of inferring that chance infers portion more than the ratio that completely charges of portion and electric power storage ratio and be set to the 1st and infer portion and the 2nd and infer at least one among the portion; Its result is easy to balancedly take into account the raising of correction precision and the increase of straightener meeting.
In addition; Comparatively it is desirable to; Said Correction and Control portion; When inferring out said the 2nd electric power storage ratio by said the 2nd portion of inferring, and when making new full charge capacity value be stored in the said capacity storage portion by said full charge capacity correction portion, be set to the 2nd infer portion the portion of inferring be reset to the said the 1st and infer portion; And be set at said the 1st electric power storage ratio through the 2nd electric power storage ratio that this is inferred out, the 1st electric power storage ratio that this is new as undertaken by presumed value the new the said the 2nd infer portion setting.
According to this structure, after revising the full charge capacity value, the 2nd electric power storage ratio that Correction and Control portion will use in the correction of this full charge capacity value is set at the 1st electric power storage ratio that is used for correction next time.Like this, need not to satisfy and infer the 1st electric power storage ratio again when can infer condition, and when satisfying the inferred condition of appointment next time, infer the 2nd electric power storage ratio and revise the full charge capacity value once more, thereby can repeat the correction of full charge capacity value continuously in next time.Its result, the straightener meeting that can increase the full charge capacity value.
In addition, comparatively it is desirable to, said new full charge capacity value is calculated through multiplying each other from inverse and the said difference aggregate-value that said the 1st electric power storage ratio deducts the difference that said the 2nd electric power storage ratio obtains by said full charge capacity correction portion.
According to this structure,, therefore can not revised the influence of the error that comprises in the preceding full charge capacity value and revised the full charge capacity value because full charge capacity correction portion does not use the full charge capacity value before revising just can not calculate new full charge capacity value.Therefore, can improve the correction precision of full charge capacity value.
In addition, comparatively it is desirable to, said full charge capacity correction portion is that Ra, said the 2nd electric power storage ratio are Rb, when said difference aggregate-value is Qd, calculate said new full charge capacity value FCCN based on following formula (1) when establishing said the 1st electric power storage ratio,
Full charge capacity value FCCN=Qd * 1/ (Rb-Ra) ... (1).
According to this structure; Because full charge capacity correction portion can use the formula (1) that does not comprise the full charge capacity value before revising to calculate new full charge capacity value, the influence of the error that comprises in the full charge capacity value before therefore can not revised and revise the full charge capacity value.Therefore, can improve the correction precision of full charge capacity value.
In addition, can also do, said full charge capacity correction portion; Full charge capacity value before establishing the correction that is stored in the said capacity storage portion is that FCCO, said the 1st electric power storage ratio are that Ra, said the 2nd electric power storage ratio are Rb, when said difference aggregate-value is Qd, obtain the 1st electric weight QF that satisfies following formula (2), and obtains the 2nd electric weight QS that satisfies following formula (3); And, when Ra＜Rb and QF＜QS, calculate said new full charge capacity value FCCN based on following formula (4); When Ra＜Rb and QF＞QS, calculate said new full charge capacity value FCCN based on following formula (5), when Ra＞Rb and QF＜QS; Calculate said new full charge capacity value FCCN based on following formula (5); When Ra＞Rb and QF＞QS, calculate said new full charge capacity value FCCN based on following formula (4)
QF＝FCCO×Ra+Qd ……(2)
QS＝FCCO×Rb ……(3)
FCCN＝FCCO-{|QS-QF|×(1/|Rb-Ra|)} ……(4)
FCCN＝FCCO+{|QS-QF|×(1/|Rb-Ra|)} ……(5)。
According to this structure; Though in the computation process of full charge capacity value FCCN, use the full charge capacity value FCCO before revising; But the influence of final full charge capacity value FCCO is eliminated, and can access result same when calculating full charge capacity value FCCN with use formula (1).
In addition; Comparatively it is desirable to; Said full charge capacity correction portion when said the 1st electric power storage ratio R a infers out in said the 1st portion of inferring, is updated to the aggregate-value of said accumulative total portion the product value of said full charge capacity value FCCO and said the 1st electric power storage ratio R a; And through letting the later accumulative total of this accumulative total portion be to proceed to the product value after this renewal, the aggregate-value of the said accumulative total portion in the time of will inferring said the 2nd electric power storage ratio R b by said the 2nd portion of inferring obtains as said the 1st electric weight QF.
When the 1st electric power storage ratio R a inferred out in the 1st portion of inferring, the aggregate-value that full charge capacity correction portion will add up portion was updated to the product of full charge capacity value FCCO and the 1st electric power storage ratio R a, the product after this renewal was proceeded the later accumulative total of this accumulative total portion.In view of the above, the aggregate-value of accumulative total portion is directly as the 1st electric weight QF that satisfies formula (2).Therefore, the calculation process of not carrying out formula (2) just obtains the 1st electric weight QF, and its result can simplify calculation process.
In addition; Comparatively it is desirable to; The terminal voltage that has said secondary cell in the said electric power storage ratio with respect to the variation of said electric power storage ratio and the 1st scope that changes and with respect to the variation of the terminal voltage of the said secondary cell of the variation of said electric power storage ratio the 2nd scope less than said the 1st scope will belong to the value of selecting in the electric power storage ratio of said the 1st scope and be set at said reference value.
According to this structure, belong to respect to the terminal voltage of the variation of electric power storage ratio the electric power storage ratio of variation greater than the 1st scope of the 2nd scope among the value selected be set to base ratio and infer the employed reference value of portion.Thus, at terminal voltage and in the zone that significantly changes with respect to the variation of electric power storage ratio, because the electric power storage ratio that obtains based on terminal voltage is consistent with reference value, so the raising of the judgement precision of base condition.And base ratio is inferred portion when satisfying base condition, and the electric power storage ratio of inferring secondary cell is a reference value; Therefore; If the judgement precision of base condition improves, then the base ratio precision of inferring of inferring the electric power storage ratio of portion improves, and then the correction precision of full charge capacity value improves.
In addition, comparatively it is desirable to, said secondary cell is a lithium rechargeable battery, and said reference value is set to the value below 10%.
SOC is that zone below 10% is equivalent to the 1st scope in lithium rechargeable battery.Therefore, if reference value is set at the value below 10%, then can improve the correction precision of full charge capacity value.
In addition, comparatively it is desirable to, also comprise: current detecting part, detect the current value of the electric current of the said secondary cell of flowing through;
Voltage detection department detects the terminal voltage of said secondary cell; Temperature detecting part detects the temperature of said secondary cell; And table storage part; Store look-up tables; This look-up table makes the temperature of current value and said secondary cell of the electric power storage ratio of said secondary cell, the said secondary cell of flowing through corresponding with the terminal voltage of this secondary cell; Wherein, Said voltage conversion ratio is obtained portion, according to the look-up table that is stored in the said table storage part, obtains and the detected terminal voltage of said voltage detection department, the detected current value of said current detecting part and the corresponding electric power storage ratio of the detected temperature of said temperature detecting part.
According to this structure; Because the electric power storage ratio of secondary cell is with to have terminal voltage value, current value and the temperature of correlationship corresponding through look-up table with this electric power storage ratio; Therefore; The voltage conversion ratio is obtained the temperature that terminal voltage that portion can the working voltage test section detects, current value that current detecting part detects and temperature detecting part detect, and under the situation of current value and Influence of Temperature of secondary cell is flowed through in reduction, can easily obtain the electric power storage ratio of secondary cell.
In addition, charging system involved in the present invention comprises: above-mentioned full charge capacity correction circuit; And charging part; Full charging voltage through said secondary cell being applied this secondary cell is charged; Wherein, The said test section that completely charges when the electric current of this secondary cell of flowing through in the charging process in said charging part during less than predefined decision threshold, is judged to be this secondary cell and is in full charging.
According to this structure,, when promptly satisfying the charging termination condition of secondary cell, judge that this secondary cell reaches full charging when the electric current of this secondary cell of flowing through in the charging process of charging part during less than predefined decision threshold.Therefore, the test section that completely charges can detect the situation that secondary cell reaches full charging accurately.
In addition, battery component involved in the present invention comprises: above-mentioned full charge capacity correction circuit and said secondary cell.
According to this structure, in possessing the battery component of secondary cell, can increase the straightener meeting of full charge capacity, and compare the correction precision that can improve full charge capacity with the method that patent documentation 1 is put down in writing.
In addition, full charge capacity modification method involved in the present invention comprises: the accumulative total operation, calculate aggregate-value through the flow through current value of electric current of secondary cell of accumulative total; The 1st infers operation; When the inferred condition that satisfies as the condition that can infer the electric power storage ratio; The electric power storage ratio of said secondary cell is estimated as the 1st electric power storage ratio; Wherein, said electric power storage ratio is to accumulate electric power storage electric weight in said secondary cell with respect to the ratio of the full charge capacity of the reality of this secondary cell; The 2nd infers operation; Infer after operation infers said the 1st electric power storage ratio the said the 1st; Keep watch on and whether to satisfy, when satisfying this and can infer condition, the electric power storage ratio of the said secondary cell of this moment is estimated as the 2nd electric power storage ratio as the inferred condition that can infer the condition of said electric power storage ratio; Full charge capacity correction operation; Based on difference aggregate-value and the difference of said the 1st electric power storage ratio and said the 2nd electric power storage ratio and 1 ratio; Infer the full charge capacity value of said secondary cell; And this full charge capacity value of inferring out revised this full charge capacity value as new full charge capacity value; Wherein, this difference aggregate-value for the said the 1st infer operation infer said the 1st electric power storage ratio rise to the said the 2nd infer operation till inferring said the 2nd electric power storage ratio during, the aggregate-value that goes out through said accumulative total operation accumulative total; And the open circuit ratio is inferred operation; With open circuit voltage conditions as the said condition of inferring; When satisfying this open circuit voltage conditions; Infer the electric power storage ratio of said secondary cell based on the terminal voltage of said secondary cell, wherein, whether said open circuit voltage conditions is being open-circuit voltage and predefined open circuit decision content is a condition when the electric current of the said secondary cell of flowing through less than the terminal voltage that is used to judge this secondary cell; Wherein, inferring operation and the said the 2nd with the said the 1st infers at least one operation in the operation and is set at said open circuit ratio and infers operation.
According to this structure, the straightener meeting that likewise can increase full charge capacity with the above-mentioned correction circuit that completely charges, and compare the correction precision that can improve full charge capacity with the method that patent documentation 1 is put down in writing.
The full charge capacity correction circuit of this structure, charging system, battery component and full charge capacity modification method can increase the straightener meeting of full charge capacity, and compare the computational accuracy that can improve full charge capacity with the method that patent documentation 1 is put down in writing.
In addition; Embodiment of in embodiment, describing or embodiment are just for clear and definite technology contents of the present invention; Should be only for due to such concrete example and not carry out narrow definition, in the scope of purport of the present invention and claim, can carry out various changes and implement.
Utilizability on the industry
Full charge capacity correction circuit involved in the present invention, charging system, battery component and full charge capacity modification method can be applicable to that vehicles such as electronic equipment, electric automobile or hybrid vehicle, mixed drive elevator, combinations such as portable personal computer or digital camera, video camera, mobile phone have in battery-mounting device, the systems such as the power-supply system, uninterrupted power supply(ups) of solar cell or TRT and secondary cell.

Claims (15)

1. full charge capacity correction circuit is characterized in that comprising:
Aggregate-value calculates through the flow through current value of electric current of secondary cell of accumulative total in accumulative total portion;
Capacity storage portion, the full charge capacity value of the full charge capacity of the said secondary cell of storage representation;
The 1st infers portion; When the inferred condition that satisfies as the condition that can infer the electric power storage ratio; The electric power storage ratio of said secondary cell is estimated as the 1st electric power storage ratio; Wherein, said electric power storage ratio is to accumulate electric power storage electric weight in said secondary cell with respect to the ratio of the full charge capacity of the reality of this secondary cell;
The 2nd infers portion; After said the 1st electric power storage ratio by said the 1st portion of inferring; Keep watch on and whether to satisfy, when satisfying this and can infer condition, the electric power storage ratio of the said secondary cell of this moment is estimated as the 2nd electric power storage ratio as the inferred condition that can infer the condition of said electric power storage ratio;
Full charge capacity correction portion; Based on difference aggregate-value and the difference of said the 1st electric power storage ratio and said the 2nd electric power storage ratio and 1 ratio; Infer the full charge capacity value of said secondary cell; Be stored in said capacity storage portion through full charge capacity value that this is inferred as new full charge capacity value and revise the full charge capacity value; Wherein, said difference aggregate-value in said the 1st portion of inferring said the 1st electric power storage ratio rise till said the 2nd electric power storage ratio to said the 2nd portion of inferring during by said accumulative total portion aggregate-value totally;
The open circuit ratio is inferred portion; With open circuit voltage conditions as the said condition of inferring; When satisfying this open circuit voltage conditions; Infer the electric power storage ratio of said secondary cell based on the terminal voltage of said secondary cell, wherein, whether said open circuit voltage conditions is being open-circuit voltage and predefined open circuit decision content is a condition when the electric current of the said secondary cell of flowing through less than the terminal voltage that is used to judge this secondary cell; And
Correction and Control portion infers portion and the said the 2nd with the said the 1st and infers in the portion at least one and be set at said open circuit ratio and infer portion.
2. full charge capacity correction circuit according to claim 1 is characterized in that also comprising:
The test section that completely charges detects said secondary cell and reaches full charging; And
The ratio that completely charges is inferred portion; The full charge condition of expiring the condition of being charged as that use detects said secondary cell with the said test section that completely charges is as the said condition of inferring, should be full during charge condition when satisfying, and the electric power storage ratio that is estimated as said secondary cell is 1; Wherein
Said Correction and Control portion, with the said open circuit ratio portion of inferring be set at the said the 1st infer that portion and the said the 2nd infers portion one of them infer portion, and the said ratio portion of inferring of completely charging be set at another infer portion.
3. full charge capacity correction circuit according to claim 1 is characterized in that also comprising:
The voltage conversion ratio is obtained portion, based on the terminal voltage of said secondary cell, obtains the electric power storage ratio of said secondary cell; And
Base ratio is inferred portion; The base condition that the electric power storage ratio that uses the said voltage conversion ratio portion of obtaining reaches predefined reference value is as the said condition of inferring, and when satisfying this base condition, the electric power storage ratio that is estimated as said secondary cell is said reference value; Wherein
Said Correction and Control portion, with the said open circuit ratio portion of inferring be set at the said the 1st infer that portion and the said the 2nd infers portion one of them infer portion, and the said base ratio portion of inferring be set at another infer portion.
4. full charge capacity correction circuit according to claim 1 is characterized in that also comprising:
The test section that completely charges detects said secondary cell and reaches full charging;
The ratio that completely charges is inferred portion, uses the full charge condition of expiring the condition of being charged as that detects said secondary cell with the said test section that completely charges as the said condition of inferring, and when satisfied this expired charge condition, the electric power storage ratio that is estimated as said secondary cell was 1;
The voltage conversion ratio is obtained portion, based on the terminal voltage of said secondary cell, obtains the electric power storage ratio of said secondary cell; And
Base ratio is inferred portion; The base condition that the electric power storage ratio that uses the said voltage conversion ratio portion of obtaining reaches predefined reference value is as the said condition of inferring, and when satisfying this base condition, the electric power storage ratio that is estimated as said secondary cell is said reference value; Wherein
Said Correction and Control portion; When satisfying said open circuit voltage conditions, said any that expires in charge condition and the said base condition; With using with this condition that satisfies is that the said portion of inferring of inferring condition is set at the said the 1st and infers portion; When the said open circuit ratio portion of inferring being set at the 1st when inferring portion; This open circuit ratio is inferred portion, the said ratio that completely charges infers portion and said base ratio any portion of inferring in the portion of inferring and is set at the said the 2nd and infers portion; When portion and said base ratio any portion of inferring in the portion of inferring that the said ratio that completely charges is inferred is set at the 1st when inferring portion, the said open circuit ratio portion of inferring is set at the said the 2nd infers portion.
5. according to each described full charge capacity correction circuit in the claim 1 to 4, it is characterized in that:
Said Correction and Control portion; When infer out said the 2nd electric power storage ratio by said the 2nd portion of inferring; And when making new full charge capacity value be stored in the said capacity storage portion by said full charge capacity correction portion; Be set to the 2nd infer portion the portion of inferring be reset to the said the 1st and infer portion, and be set at said the 1st electric power storage ratio through the 2nd electric power storage ratio that this is inferred out, the 1st electric power storage ratio that this is new as undertaken by presumed value the new the said the 2nd infer portion setting.
6. according to each described full charge capacity correction circuit in the claim 1 to 5, it is characterized in that:
Said new full charge capacity value is calculated through multiplying each other from inverse and the said difference aggregate-value that said the 1st electric power storage ratio deducts the difference that said the 2nd electric power storage ratio obtains by said full charge capacity correction portion.
7. full charge capacity correction circuit according to claim 6 is characterized in that:
Said full charge capacity correction portion is that Ra, said the 2nd electric power storage ratio are Rb, when said difference aggregate-value is Qd, calculate said new full charge capacity value FCCN based on following formula (1) when establishing said the 1st electric power storage ratio,
Full charge capacity value FCCN=Qd * 1/ (Rb-Ra) ... (1).
8. according to each described full charge capacity correction circuit in the claim 1 to 5, it is characterized in that:
Said full charge capacity correction portion, the full charge capacity value before establishing the correction that is stored in the said capacity storage portion is that FCCO, said the 1st electric power storage ratio are that Ra, said the 2nd electric power storage ratio are Rb, when said difference aggregate-value is Qd, obtain the 1st electric weight QF that satisfies following formula (2); And obtain the 2nd electric weight QS that satisfies following formula (3), and, when Ra＜Rb and QF＜QS; Calculate said new full charge capacity value FCCN based on following formula (4); When Ra＜Rb and QF＞QS, calculate said new full charge capacity value FCCN based on following formula (5), when Ra＞Rb and QF＜QS; Calculate said new full charge capacity value FCCN based on following formula (5); When Ra＞Rb and QF＞QS, calculate said new full charge capacity value FCCN based on following formula (4)
QF＝FCCO×Ra+Qd ……(2)
QS＝FCCO×Rb ……(3)
FCCN＝FCCO-{|QS-QF|×(1/|Rb-Ra|)} ……(4)
FCCN＝FCCO+{|QS-QF|×(1/|Rb-Ra|)} ……(5)。
9. full charge capacity correction circuit according to claim 8 is characterized in that:
Said full charge capacity correction portion; When said the 1st electric power storage ratio R a infers out in said the 1st portion of inferring; The aggregate-value of said accumulative total portion is updated to the product value of said full charge capacity value FCCO and said the 1st electric power storage ratio R a; And through letting the later accumulative total of this accumulative total portion be to proceed to the product value after this renewal, the aggregate-value of the said accumulative total portion in the time of will inferring said the 2nd electric power storage ratio R b by said the 2nd portion of inferring obtains as said the 1st electric weight QF.
10. according to claim 3 or 4 described full charge capacity correction circuits, it is characterized in that:
The terminal voltage that has said secondary cell in the said electric power storage ratio is with respect to the variation of said electric power storage ratio and the 1st scope that changes and with respect to the variation of the terminal voltage of the said secondary cell of the variation of said electric power storage ratio the 2nd scope less than said the 1st scope
To belong to the value of selecting in the electric power storage ratio of said the 1st scope and be set at said reference value.
11. full charge capacity correction circuit according to claim 10 is characterized in that:
Said secondary cell is a lithium rechargeable battery,
Said reference value is set to the value below 10%.
12., it is characterized in that also comprising according to claim 3 or 4 described full charge capacity correction circuits:
Current detecting part detects the current value of the electric current of the said secondary cell of flowing through;
Voltage detection department detects the terminal voltage of said secondary cell;
Temperature detecting part detects the temperature of said secondary cell; And
The table storage part, store look-up tables, this look-up table makes the temperature of current value and said secondary cell of the electric power storage ratio of said secondary cell, the said secondary cell of flowing through corresponding with the terminal voltage of this secondary cell, wherein,
Said voltage conversion ratio is obtained portion; According to the look-up table that is stored in the said table storage part, obtain and the detected terminal voltage of said voltage detection department, the detected current value of said current detecting part and the corresponding electric power storage ratio of the detected temperature of said temperature detecting part.
13. a charging system is characterized in that comprising:
Like claim 2 or 4 described full charge capacity correction circuits; And
Charging part is charged through the full charging voltage that said secondary cell is applied this secondary cell, wherein,
The said test section that completely charges when the electric current of this secondary cell of flowing through in the charging process in said charging part during less than predefined decision threshold, is judged to be this secondary cell and is in full charging.
14. a battery component is characterized in that comprising:
Like each described full charge capacity correction circuit in the claim 1 to 12; And
Said secondary cell.
15. a full charge capacity modification method is characterized in that comprising following operation:
The accumulative total operation is calculated aggregate-value through the flow through current value of electric current of secondary cell of accumulative total;
The 1st infers operation; When the inferred condition that satisfies as the condition that can infer the electric power storage ratio; The electric power storage ratio of said secondary cell is estimated as the 1st electric power storage ratio; Wherein, said electric power storage ratio is to accumulate electric power storage electric weight in said secondary cell with respect to the ratio of the full charge capacity of the reality of this secondary cell;
The 2nd infers operation; Infer after operation infers said the 1st electric power storage ratio the said the 1st; Keep watch on and whether to satisfy, when satisfying this and can infer condition, the electric power storage ratio of the said secondary cell of this moment is estimated as the 2nd electric power storage ratio as the inferred condition that can infer the condition of said electric power storage ratio;
Full charge capacity correction operation; Based on difference aggregate-value and the difference of said the 1st electric power storage ratio and said the 2nd electric power storage ratio and 1 ratio; Infer the full charge capacity value of said secondary cell; And this full charge capacity value of inferring out revised this full charge capacity value as new full charge capacity value; Wherein, this difference aggregate-value for the said the 1st infer operation infer said the 1st electric power storage ratio rise to the said the 2nd infer operation till inferring said the 2nd electric power storage ratio during, the aggregate-value that goes out through said accumulative total operation accumulative total; And
The open circuit ratio is inferred operation; Open circuit voltage conditions as the said condition of inferring, when satisfying this open circuit voltage conditions, is inferred the electric power storage ratio of said secondary cell based on the terminal voltage of said secondary cell; Wherein, Whether said open circuit voltage conditions is to be open-circuit voltage and predefined open circuit decision content is a condition when the electric current of the said secondary cell of flowing through less than the terminal voltage that is used to judge this secondary cell, wherein
Inferring operation and the said the 2nd with the said the 1st infers at least one operation in the operation and is set at said open circuit ratio and infers operation.
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