CN100535680C - Deterioration judging device and method, computer program - Google Patents

Deterioration judging device and method, computer program Download PDF

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Publication number
CN100535680C
CN100535680C CNB2006100932321A CN200610093232A CN100535680C CN 100535680 C CN100535680 C CN 100535680C CN B2006100932321 A CNB2006100932321 A CN B2006100932321A CN 200610093232 A CN200610093232 A CN 200610093232A CN 100535680 C CN100535680 C CN 100535680C
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battery
mentioned
voltage
discharge
load
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CN1916653A (en
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松岛敏雄
铃木伸彦
若木宽
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NTT Facilities Inc
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NTT Facilities Inc
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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]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • 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
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

This invention provides a battery degradation determining apparatus capable of deduce the capacity of a storage battery. In the battery degradation determination method, the battery degradation state of the battery to be measured is determined. The apparatus reduces the voltage output from a rectifier supplying power to a load, measures current flowing from the rectifier for connecting the battery to be measured to the output side in parallel and the battery to the load connected to the output of the rectifier in parallel and a dummy load device connected to the output of the rectifier in parallel separately from the load; controls the load of the dummy load device, such that the measured current is a predetermined current value; and calculates the remaining capacity of the battery, based on the discharge time of the discharge current of discharging the battery to the load and the dummy load device and the terminal voltage of the battery, corresponding to the discharge current at the discharge time, by referring to a battery data storage section for storing battery data indicating the relation among the discharge time, the terminal voltage, and the residual capacity at a predetermined current of the battery to be measured.

Description

Degradation determination device, deterioration determination method, computer program
Technical field
The present invention relates in as standby electric power supply system with secondary cell, to have degradation determination device, deterioration determination method and the computer program of the deterioration diagnostic function of secondary cell, especially lithium ion battery.
Background technology
Past, supply with equipment to communications such as telephone exchange direct electric power the direct current feed system in, keeping standby accumulator in the floating charge mode.In this system, load equipment and accumulator in the outgoing side parallel connection of rectifier, rectifier is supplied with direct current power to load all the time, and supplies with necessary charging current, so that according to the charged state of accumulator battery is charged fully.In this system, if the fault of power failure or rectifier takes place, then moment is carried out the discharge from accumulator, even in a flash, also can not interrupt supplying with to the electric power of load equipment.
Can hope owing to used accumulator, by holding the residual capacity of accumulator, obtain the performance that give full play to accumulator in such system that requires reliability, hold the state of system.
Based on such background, studied the state recognizing method and the method for monitoring of several standby batteries.One in these in method is, in the electric power supply process of power-supply system, confirms the normality of supplying with from the electric power of battery.This is by only reducing the output voltage of rectifier at the appointed time, carry out the discharge of accumulator, the clear voltage characteristic (with reference to non-patent literature 1) of grasping this moment.
Non-patent literature 1:KOZUKA, et al. " Development of On-line BatteryTesting Technology ", Proceeding of INTELE ' 97,18-2, p.397.
But the mode of carrying out battery discharging at above-mentioned output voltage of the prior art, that only reduce rectifier in official hour is to be purpose with the normality of confirming the charging and discharging of accumulator circuit.Therefore, existence can not be held the problem of the residual capacity of accumulator.
Therefore, even try to carry out the work of " inferring the residual capacity of accumulator ",, therefore, can not guarantee that discharge current value necessarily becomes fixing value owing to be that actual loading is directly discharged.For this reason, the discharging voltage characteristic of measurement is different with the constant current discharge characteristic, can not carry out capacity and infer.
Moreover the residual capacity of accumulator and the relation of voltage characteristic are indeterminate, the biggest obstacle when this becomes the supposition of enforcement capacity.
Summary of the invention
The present invention makes in view of such problem, its objective is degradation determination device, deterioration determination method, computer program that the capacity that can infer accumulator is provided.
For solving above-mentioned problem, the present invention is a degradation determination device of judging the deterioration state of measuring object battery, and it has: the rectifier voltage control part, reduce from the output voltage to the rectifier of load supply capability; Rectifier is at its outgoing side above-mentioned measuring object battery that has been connected in parallel; Load is connected in parallel with the output terminal of above-mentioned rectifier dividually with above-mentioned measuring object battery; The fictitious load device is connected in parallel with above-mentioned load and the same dividually output terminal with above-mentioned rectifier of above-mentioned measuring object battery; Load current measurement section, measurement flow to the current value of above-mentioned load and above-mentioned fictitious load device from above-mentioned rectifier and above-mentioned battery; Control part is controlled the load of above-mentioned fictitious load device, makes the measurement result of above-mentioned load current measurement section become the predetermined electric current value; Battery data storage part, storage representation become the battery data that concerns between the voltage between terminals of discharge time, above-mentioned battery of rated current value of battery of measuring object and the residual capacity; And operational part, with reference to the above-mentioned battery data that is stored in above-mentioned battery data storage part, and according to discharge time of the discharge current of above-mentioned fictitious load device and above-mentioned load discharge and with the voltage between terminals of the corresponding above-mentioned battery of above-mentioned discharge current of above-mentioned discharge time, calculate the residual capacity of above-mentioned battery.
And, the present invention is, in above-mentioned degradation determination device, above-mentioned battery data storage part is at when discharge storage representation discharge current, the discharge battery data of the relation of the poor and battery remaining power of voltage between the battery terminal when being kept by charging before the discharge beginning of voltage between the battery terminal in elapsed time arbitrarily arbitrarily.
And, the present invention is, in above-mentioned degradation determination device, above-mentioned battery data storage portion stores is represented discharge current arbitrarily and the battery data of the relation of the poor and battery remaining power of voltage between discharge time, the battery terminal when becoming voltage and discharge between the battery terminal under the charged state of battery of benchmark arbitrarily.
Moreover the present invention is, in above-mentioned degradation determination device, and the voltage between terminals above-mentioned each residual capacity of battery data storage portion stores, the expression battery and the battery data of the relation in discharge elapsed time.
And, the present invention is, in above-mentioned degradation determination device, above-mentioned battery data storage part is according to each discharging condition storage battery data, and this discharging condition comprises manufacturer, delivery merchant, makes lot number, battery variety, battery temperature, discharge current value, in the discharge elapsed time at least more than one.
And, the present invention is, in above-mentioned degradation determination device, from above-mentioned battery to above-mentioned load and above-mentioned fictitious load device just under the situation in supply capability, when the voltage of above-mentioned battery dropped to smaller or equal to setting, the voltage that above-mentioned rectifier voltage control module is removed above-mentioned rectifier descended.
In addition, the present invention is a deterioration determination method of judging the deterioration state of measuring object battery, and it may further comprise the steps: reduce the output voltage of the rectifier of load supply capability being exported from; The current value that measurement flows to load and fictitious load device from the rectifier and the above-mentioned battery of the above-mentioned measuring object battery that has been connected in parallel at outgoing side, wherein, the output terminal of above-mentioned load and above-mentioned rectifier is connected in parallel, and above-mentioned fictitious load device is connected in parallel dividually in the output terminal and the above-mentioned load of above-mentioned rectifier; Control the load of above-mentioned fictitious load device, make above-mentioned measurement result become the predetermined electric current value; With reference to the battery data storage part and according to voltage between terminals to discharge time of the discharge current of above-mentioned fictitious load device and above-mentioned load discharge and the above-mentioned battery corresponding with the above-mentioned discharge current of above-mentioned discharge time, calculate the residual capacity of above-mentioned battery, above-mentioned battery data storage portion stores represents to become the battery data of the relation of the voltage between terminals of discharge time, above-mentioned battery of rated current value of battery of measuring object and residual capacity.
In addition, the present invention is a computer program, makes the computing machine of the degradation determination device of the deterioration state of judging the measuring object battery have function with lower unit: reduce to the unit of the output voltage of the rectifier output of load supply capability; Measurement is from unit that the rectifier and the above-mentioned battery of the above-mentioned measuring object battery that has been connected in parallel at outgoing side flows to the current value of load and fictitious load device, wherein, the output terminal of above-mentioned load and above-mentioned rectifier is connected in parallel, and above-mentioned fictitious load device is connected in parallel dividually in the output terminal and the above-mentioned load of above-mentioned rectifier; Control the load of above-mentioned fictitious load device, make above-mentioned measurement result become the unit of predetermined electric current value; And, with reference to the battery data storage part and according to discharge time of the discharge current of above-mentioned fictitious load device and above-mentioned load discharge and with the voltage between terminals of the corresponding above-mentioned battery of above-mentioned discharge current of above-mentioned discharge time, calculate the unit of the residual capacity of above-mentioned battery, above-mentioned battery data storage portion stores represents to become the battery data of the relation of the voltage between terminals of discharge time, above-mentioned battery of rated current value of battery of measuring object and residual capacity.
Therefore as described above,, possess fictitious load, the discharge current from battery can be adjusted into constantly, can obtain discharging voltage characteristic with high precision according to this invention.And, with reference to more high-precision voltage characteristic be stored in the battery data of battery data storage part, therefore, the precision of can also the raising capacity inferring.
And, according to the present invention, from battery under the situation of load and above-mentioned fictitious load unit feeding electric power, when the voltage of battery dropped to smaller or equal to setting, the voltage of removing rectifier descended.Therefore, even under the situation that finishes to discharge from battery the back in the deterioration judgment processing, can prevent that also the residual capacity of battery is reduced to the degree that can not drive load.
Description of drawings
Fig. 1 is the summary block scheme of structure of the continuous-current plant 1 with secondary cell deterioration diagnostic function of the expression degradation determination device that has been suitable for one embodiment of the present invention.
Fig. 2 is the summary block scheme of the structure of expression control device 100.
Fig. 3 is the figure of an example that expression is stored in the battery data of battery data storage part 104.
Fig. 4 is the figure of an example of expression battery data.
Fig. 5 is the process flow diagram that is used to illustrate the work of the continuous-current plant 1 with secondary cell deterioration diagnostic function.
Fig. 6 is the figure that is used to illustrate the work of the continuous-current plant 1 with secondary cell deterioration diagnostic function.
Fig. 7 is used for illustrating that deterioration judges the figure that concerns between the sparking voltage of each setting voltage of test and accumulator.
Fig. 8 is the discharge curve of the battery under the modal representation original state and the figure that is in the discharge curve of the battery under the deterioration state in each residual capacity.
Fig. 9 was illustrated in each discharge time, the voltage between terminals of the battery of original state and the figure of the difference Δ V of the voltage between terminals of the battery of deterioration state.
Figure 10 is illustrated in the elapsed time of discharging arbitrarily, the figure of the difference of the voltage between terminals of the battery that the open voltage of 100% capacity battery and capacity have descended.
Figure 11 is the figure of an example of expression battery data.
Figure 12 is the summary block scheme that is illustrated in the suitable example of the automatic deterioration diagnostor of secondary cell in the alternating electromotive force feedway.
Figure 13 is the summary block scheme that is illustrated in the suitable example of the automatic deterioration diagnostor of secondary cell in the alternating electromotive force feedway.
Embodiment
Below, with reference to the degradation determination device of description of drawings one embodiment of the present invention.
The degradation determination device of present embodiment is, in any time of appointment, only carries out the battery discharging of random time by any electric current of appointment, infers the deterioration state of accumulator according to the flash-over characteristic of this moment.That is, owing to during forward load equipment supply capability, carry out discharge, therefore, in the present embodiment, the output voltage of the rectifier in the work is reduced to designated value in the voltage range that load is allowed from accumulator.Thus, carry out discharge from accumulator.But under this state, the discharge current of accumulator remains the needed current value of load, therefore, the fictitious load device is set in the present embodiment adjusts electric current, so that carry out discharge from accumulator according to any steady current of appointment.Thus, can discharge, can obtain so-called " steady current flash-over characteristic " by constant electric current.
Because therefore the deterioration state of performance accumulator in the timeliness change curve of the voltage in the steady current discharge, in any elapsed time of appointment, measures the terminal voltage as the battery of object.Utilize the voltage between terminals value of measuring, contrast the battery data that concerns between deterioration that try to achieve in advance, the expression accumulator and the voltage between terminals, infer the capacity of object battery.
Below, the degradation determination device of one embodiment of the present invention is described.
Fig. 1 is the summary block scheme of structure that expression has been suitable for the continuous-current plant 1 degradation determination device, that have secondary cell deterioration diagnostic function of one embodiment of the present invention.
Continuous-current plant 1 with secondary cell deterioration diagnostic function comprises control device 100, AC power 109, rectifier 200, AC power 300, load 400, fictitious load device 500, Battery pack 600, circuitry cuts switch 700, load current sensor 800, Battery pack discharge current sensor 810, temperature sensor 820, voltage sensor 830, cell voltage adjustment circuit 900.
Alternating current from AC power 300 is supplied with is converted into direct current by rectifier 200, supplies with Battery pack 600 and load 400.Battery pack 600 connects a plurality of lithium rechargeable batteries and constitutes, and is connected with load 400 with rectifier 200, can charge, discharge.
AC power 109 is supplied with alternating current to control device 100.
Fictitious load device 500 carries out from the discharge of Battery pack 600 based on the fictitious load control signal from control device 100, makes the current value summation of load 400 and fictitious load device 500 become the predetermined electric current value.
Circuitry cuts switch 700 is carried out the open and close action based on the open and close signal that is included in the fictitious load control signal, under the situation of closing from Battery pack 600 separation simulation load devices 500.
Load current sensor 800 is measured the current value of supply load 400, to control device 100 output measurement results.Battery pack discharge current sensor 810 detects the electric current of supplying with from Battery pack 600, to control device 100 output testing results.Temperature sensor 820 is measured the temperature of Battery pack 600, to control device 100 output measurement results.The voltage of voltage sensor 830 test set batteries 600 is to control device 100 output testing results.Cell voltage is adjusted the voltage that circuit 900 is controlled each battery of the lithium rechargeable battery that constitutes Battery packs 600.
The structure of control device 100 then, is described.Fig. 2 is the summary block scheme of the structure of expression control device 100.
The measurement result that data input part 101 inputs are exported from load current sensor 800, Battery pack discharge current sensor 810, temperature sensor 820, voltage sensor 830, and output to control part 103 and operational part 105.Measuring condition setting value input part 102 has the function of reception from user's input, comprises keyboard, function key.Control part 103 has to rectifier 200 output rectifiers output control signal, and is reducing from the function of the output voltage of rectifier 200 outputs in the range of set value of measuring condition setting value input part 102 inputs.And control part 103 is controlled to fictitious load device 500 output fictitious load control signals, and the electric current summation that flows to load 400 and fictitious load device 500 is become from the setting value of measuring condition setting value input part 102 inputs.
For example, storing at battery data storage part 104: with relevant information such as manufacturer, delivery merchant, the manufacturing of making batteries such as lot number and circulations; The battery data of expression " difference of voltage between terminals at any time and relation " with battery capacity of various residual capacities; Expression " relation of the poor and residual capacity of the open voltage of new battery (100% capacity) and the voltage between terminals when making the battery discharge of various residual capacities "; The battery data of expression " relation of the poor and residual capacity of the voltage between terminals of the charging voltage (below, in this paper or figure, be reduced to " keeping charging voltage " sometimes and show) of keeping when charging during " with the battery discharge that makes various residual capacities.At this, residual capacity refers to, in the standby battery in aforesaid electric power supply system, and the capacity of under complete charged state, possessing.An example of representing to be stored in the battery data of this battery data storage part 104 at Fig. 3.At this, the stored expression battery data of the relation of the difference of the voltage between terminals of the battery that reduced of the voltage between terminals of 100% capacity battery in discharge elapsed time and capacity arbitrarily.For any current value is the situation of current value I 1～In, and (A～X) has stored this battery data by the kind of each battery.Represent an example of storage like this at Fig. 4.And, as required, manufacture by each temperature T e (n).
Operational part 105 have reception from the function and the voltage between terminals value that has received more of the voltage between terminals value of the Battery pack 600 of data input part 101 output and be stored in the data of battery data storage part 104, the residual capacity of calculating the measuring object battery is carried out the function that deterioration is judged.
Display part 106 shows the operation result of operational part 105 by meter.Power supply unit 107 is transformed to direct supply with the AC100V of AC power 109 outputs, supplies with the internal electric source of degradation determination device 100.Data sending part 110 is connected the terminal of monitoring sensor through external communication interface 108, sends data as the operation result of operational part 106 to the terminal of monitoring sensor.Cell voltage is adjusted circuit control part 111 and is adjusted the control signal that circuit 900 outputs are used to control cell voltage to cell voltage.
Below, the work of the continuous-current plant 1 that the flowchart text of use Fig. 5 is above-mentioned with secondary cell deterioration diagnostic function.
At first, in standby (step S1), instrumentation calculates lowest high-current value (step S2) from the load current of rectifier 200 supply loads 400.Then, when by the user from measuring condition setting value input part 102 input deterioration judgment processing begin to indicate the time, beginning deterioration judgment processing (step S3).At this, then the deterioration judgment processing begin indication, accept by user's input, continue to reduce setting value discharge time, current setting value from the voltage of rectifier 200 outputs.
When the various setting value of input, control part 103 is to rectifier 200 output rectifiers output control signal, to reduce the output voltage (step S4) of rectifier 200.
Follow output voltage, begin from the discharge of Battery pack 600 from rectifier.Control part 103 utilizes the fictitious load control signal suitably to control the current value that fictitious load device 500 is shared, so that flow into the constant current value (step S5) that the total (value of the testing result of Battery pack discharge current sensor 810) of the current value of load 400 and fictitious load device 500 becomes appointment.
Control part 103 is also from beginning to carry out the moment of deterioration judgment processing the timing (step S6) of beginning battery discharging time.Then, by the voltage between terminals (step S7) of voltage sensor 830 instrumentation Battery packs 600, whether the voltage that detects Battery pack 600 drops to setting (step S8).When the voltage of Battery pack 600 dropped to setting, the voltage of removing rectifier descended, and makes the rectifier output voltage return to normal voltage, and transmitted alarm (step S9) to the terminal of monitoring sensor, transferred to step S1.
On the other hand, during more than or equal to setting, whether the clocking value that detects the battery discharging time reached from the discharge time (step S10) of measuring condition setting value input part 102 inputs at the voltage of Battery pack 600.When clocking value does not reach discharge time, transfer to step S5.
On the other hand, when clocking value reaches discharge time, measure the voltage between terminals of the object battery of this discharge time, the measurement result of record temperature sensor 820 and the magnitude of voltage (step S11) of measurement result by voltage sensor 830.When the testing result that has write down temperature sensor 820, cell voltage, operational part 105 and Measuring Time, measurement temperature are accordingly with reference to the battery data that is stored in battery data storage part 104, and, carry out the calculating (step S12) of battery capacity based on the cell voltage that writes down.
In the calculating of this battery capacity, can use " difference of the voltage between terminals of random time and the relation of battery capacity " of trying to achieve according to flash-over characteristic (time behavior of voltage between terminals) with accumulator of various residual capacities.With discharge current arbitrarily, environment temperature is tried to achieve above-mentioned relation and is got final product arbitrarily.And, can also use " the open voltage of new battery (100% capacity) and the voltage between terminals when making the battery discharge of various residual capacities poor, with the relation of battery capacity ", carry out the computing of residual capacity.Moreover, can also utilize " voltage between terminals of the charging voltage of keeping when charging during poor, with the relation of battery capacity " with the battery discharge that makes various residual capacities, carry out the calculating of residual capacity.And, in this measurement result, from the battery variety of measuring condition setting value input part 102 inputs, select qualified battery data to carry out reference based on temperature sensor 820.
When calculating battery capacity, control part 103 makes the output voltage of rectifier 200 return to (step S13) behind the common output voltage, the value (step S14) of the battery capacity that output is calculated.This output is to carry out to the transmission of the terminal of the monitoring sensor of outside by the demonstration of display part 106 with from data sending part 110.
Then, when having exported measurement result, control part 103 finishes deterioration judgment processing (step S15).
And, in the carrying out of this process, also have a power failure concurrently or the detection of rectifier fault.Then, in a single day taking place under the situation of above-mentioned fault, proceed to supply with to the electric power of load 400, and the capacity of cancelling in this process is being inferred operation from Battery pack 600.Have a power failure after the end, the output voltage of rectifier 200 is set to general value, carries out to the electric power supply of load 400 and the charging of Battery pack 600.
At this, use Fig. 6 to further specify the work of continuous-current plant 1 with secondary cell deterioration diagnostic function.
When beginning deterioration judgement test at moment T1, according to the indication from control part 103, (symbol a) for the reduction of the output voltage of rectifier 200.Set the output voltage of rectifier 200 for following voltage, i.e. the high value of lower limit of the voltage range that can work than load 400, and make the electric power of load 400 is supplied with the discharge that only becomes from accumulator.
When output voltage reduces, by from Battery pack 600 supply capabilities, export battery current (symbol b), fictitious load current sinking (symbol c) takes place.Then, through discharge time of appointment, when in the moment T2 off-test, based on the indication from control part 103, the output voltage of rectifier 200 returns to common voltage, begins Battery pack 600 charge (symbol e).Then, the circuitry cuts switch 700 by fictitious load device 500 becomes the pass, and the current sinking of fictitious load device 500 becomes 0 (symbol f).And, in this figure, the discharge current IB=fictitious load electric current I of accumulator DL+ load current I L
Further, use Fig. 7 to illustrate that deterioration judges the relation of the sparking voltage of each setting voltage in the test and accumulator.The figure shows the bound of the service voltage in DC power-supply system and common rectifier operating voltage Vn, the rectifier voltage VT when also having test to implement.Rectifier voltage VT when test is implemented is set to the value higher than the lower voltage limit of system.Beginning along with test when the rectifier output voltage is set to trial voltage VT, meanwhile begins battery discharging.Under the situation of the normal accumulator that capacity does not lose terrifically, it is that (symbol a) changes, T2 off-test at the appointed time along discharge curve that the timeliness of voltage changes.Under the situation of the battery that capacity is reducing, discharge with the curve as discharge curve (symbol b), in the time than setting weak point discharge time, off-test (B point).Therefore become the voltage identical with the rectifier output voltage at the B point, only can not carry out from the discharge of accumulator, in fact test finishes.Control part 103 detects this state, and capacity is inferred in the stage of this T3 before the time and carried out, moreover the voltage of rectifier reduces end-of-job, returns to common voltage Vn.On the other hand, ignored the state that B is ordered that arrives, set abnormality detection voltage VB, carried out system protection in order to prevent control part 103.This example is represented by discharge curve (symbol c).That is, when detecting off-test, further discharge in B ' point control portion 103.If drop to the minimum voltage VL of system, probably can exert an influence to load.Therefore, setting abnormality detection voltage VB if take place to drop to this voltage condition from the output of system, just finishes test, carries out the processing such as stopping, giving the alarm of the output decline of rectifier.
At this, as long as in the maximal value of the discharge time of when on-test, setting, carrying out the computing that above-mentioned capacity infers can carry out repeatedly, rather than once, infer by capacity repeatedly, when calculated value enters in the precision (for example, the difference of 3～4 times measured value is 5%) as target, even also can finish test in discharge time setting.On the other hand, in the time of in not having the target approach precision, all set the discharge of discharge time, carry out capacity infer and finish the test.
According to the embodiment of above explanation, calculate battery capacity after, control part 103 makes the output voltage of rectifier 200 turn back to appropriate value.Thus, to load 400 supply capabilities, carry out the charging of Battery pack 600 simultaneously, the electric power quality of supply load side is not exerted an influence from rectifier 200.
And, according to this embodiment, cell voltage at Battery pack 600 drops under the situation of setting, control part 103 makes the output voltage to rectifier 200 return to initial value, therefore, when making Battery pack 600 discharge, judge power failure after the test etc., Battery pack 600 is not exclusively discharged in order to deal with deterioration.Moreover, by the setting of several detection voltages, prevent because of test generation problem in system.
And, in the above-described embodiment, the situation of the battery data that concerns has been described between battery data storage part 104 storage representation voltage difference delta V and residual capacity, still, also can utilize the represented data of discharge curve shown in Figure 8.The figure of the discharge curve of the battery that is in deterioration state when Fig. 8 (a) is the discharge curve of the pattern ground expression battery that is in original state and each residual capacity.In this figure, voltage between terminals when being the battery discharge of Cn, that passed through Tn discharge time that Vcn (Tn) expression makes residual capacity.That is, each battery variety and discharge current are obtained relation between the voltage between terminals in residual capacity and various elapsed time.At this, Fig. 8 (b) is that expression has the figure that concerns between voltage between terminals after elapsed time of respectively discharging of battery of each residual capacity and the residual capacity.By the relation that use in capacity is inferred is tried to achieve like this, in the discharge current of stipulating in advance, can measure and pass through the voltage between terminals of specifying the moment of discharge time, infer capacity.
And, as the battery data that is stored in battery data storage part 104, can use out of Memory.Fig. 9 is expression voltage between terminals each discharge time, that be in original state and is in the figure of the difference Δ V of the voltage between terminals of deterioration state.In Fig. 9, illustrating and having passed through discharge time voltage between terminals during Tn, that be in original state (discharge capacity is 100%) is V 100(Tn), becoming 80% voltage between terminals through the deterioration residual capacity is V 80(Tn), to become 60% voltage between terminals be V to residual capacity 60(Tn).And, in this figure, represented to pass through voltage between terminals V during Tn, that be in original state discharge time with arrow b 100(Tn) and be in the voltage between terminals V of deterioration state 60(Tn) voltage difference delta V.
Utilize such flash-over characteristic, also can use the open voltage Vopen of expression battery each discharge time, that be in original state and be in the voltage difference delta V ' (symbol of Fig. 9 (c)) of the voltage between terminals of deterioration state and residual capacity between the information that concerns.
Figure 10 is the figure that is illustrated in the difference of the voltage between terminals that the open voltage elapsed time of discharging arbitrarily, 100% capacity battery and capacity descend.At this moment, the battery data of the relation of battery data storage part 104 these figure of storage representation.Represent an example of the battery data of storage like this at Figure 11.Such battery data is made by each battery variety.And, similarly, also can make figure about " relation of the poor and battery capacity of the voltage between terminals of the charging voltage of keeping when charging during " with the battery discharge that makes various residual capacities.In the power-supply system of reality, battery is kept by charging devices such as fairings, therefore, compares with open voltage, and is more practical with the relation of " charging voltage when keeping charging ".
And, in the embodiment described above,, still, be not limited only to the direct current feed system although understand that the electric power of supply load 400 is situations of direct current, can also be applicable to the interchange feed system.Figure 12, Figure 13 are the summary block schemes that is illustrated in the suitable example of the automatic deterioration diagnostor of secondary cell in the alternating electromotive force feedway.In Figure 12, Figure 13, in the alternating electromotive force feed system of special charger with standby battery, carry out the adjustment of the charging voltage of special charger, replace the voltage adjustment of the rectifier in the direct current feed system, moreover, the discharge of accumulator is not actual loading to be carried out but the fictitious load of special use is carried out, and still, it is substantially the same to infer the capacity this point by the constant current discharge of accumulator.
And, for the influence to load such as the over-discharge can of the discharge that prevents to be used for testing, can also measure the total voltage of Battery pack 600, if drop to the magnitude of voltage that is used for dangerous precognition of prior setting, just stop battery discharging.
And, can also in the recording medium of embodied on computer readable, write down the functional programs of the control device 100 that is used for realizing Fig. 1, by computing machine being read in and the program of executive logging in this recording medium, carry out deterioration and judge.
More than, describe embodiments of the present invention in detail with reference to accompanying drawing, but concrete structure is not subjected to the qualification of this embodiment, do not break away from design in the scope of purport of the present invention etc. and be also included among the present invention.

Claims (7)

1. degradation determination device, judge the deterioration state of measuring object battery to it is characterized in that having:
The rectifier voltage control part reduces from the output voltage to the rectifier of load supply capability;
Rectifier is at its outgoing side above-mentioned measuring object battery that has been connected in parallel;
Load is connected in parallel with the output terminal of above-mentioned rectifier dividually with above-mentioned measuring object battery;
The fictitious load device is connected in parallel with above-mentioned load and the same dividually output terminal with above-mentioned rectifier of above-mentioned measuring object battery;
Load current measurement section, measurement flow to the current value of above-mentioned load and above-mentioned fictitious load device from above-mentioned rectifier and above-mentioned battery;
Control part is controlled the load of above-mentioned fictitious load device, makes the measurement result of above-mentioned load current measurement section become the predetermined electric current value;
Battery data storage part, storage representation become the battery data that concerns between the voltage between terminals of discharge time, above-mentioned battery of rated current value of battery of measuring object and the residual capacity; And
Operational part, with reference to the above-mentioned battery data that is stored in above-mentioned battery data storage part, and according to discharge time of the discharge current of above-mentioned fictitious load device and above-mentioned load discharge and with the voltage between terminals of the corresponding above-mentioned battery of above-mentioned discharge current of above-mentioned discharge time, calculate the residual capacity of above-mentioned battery.
2. degradation determination device as claimed in claim 1 is characterized in that,
Above-mentioned battery data storage part is at when discharge storage representation discharge current, the discharge battery data of the relation of the poor and battery remaining power of voltage between the battery terminal when being kept by charging before the discharge beginning of voltage between the battery terminal in elapsed time arbitrarily arbitrarily.
3. degradation determination device as claimed in claim 1 is characterized in that,
Above-mentioned battery data storage portion stores is represented discharge current arbitrarily and the battery data of the relation of the poor and battery remaining power of voltage between discharge time, the battery terminal when becoming voltage and discharge between the battery terminal under the charged state of battery of benchmark arbitrarily.
4. degradation determination device as claimed in claim 1 is characterized in that,
The voltage between terminals above-mentioned each residual capacity of battery data storage portion stores, the expression battery and the battery data of the relation in discharge elapsed time.
5. degradation determination device as claimed in claim 1 is characterized in that,
Above-mentioned battery data storage part is according to each discharging condition storage battery data, and this discharging condition comprises manufacturer, delivery merchant, makes lot number, battery variety, battery temperature, discharge current value, in the discharge elapsed time at least more than one.
6. as each described degradation determination device in the claim 1 to 5, it is characterized in that,
From above-mentioned battery to above-mentioned load and above-mentioned fictitious load device just under the situation in supply capability, when the voltage of above-mentioned battery dropped to smaller or equal to setting, the voltage that above-mentioned rectifier voltage control module is removed above-mentioned rectifier descended.
7. deterioration determination method is judged to it is characterized in that the deterioration state of measuring object battery, may further comprise the steps:
The output voltage of reduction from the rectifier of load supply capability being exported;
The current value that measurement flows to load and fictitious load device from the rectifier and the above-mentioned battery of the above-mentioned measuring object battery that has been connected in parallel at outgoing side, wherein, the output terminal of above-mentioned load and above-mentioned rectifier is connected in parallel, and above-mentioned fictitious load device is connected in parallel dividually in the output terminal and the above-mentioned load of above-mentioned rectifier;
Control the load of above-mentioned fictitious load device, make above-mentioned measurement result become the predetermined electric current value;
With reference to the battery data storage part and according to voltage between terminals to discharge time of the discharge current of above-mentioned fictitious load device and above-mentioned load discharge and the above-mentioned battery corresponding with the above-mentioned discharge current of above-mentioned discharge time, calculate the residual capacity of above-mentioned battery, above-mentioned battery data storage portion stores represents to become the battery data of the relation of the voltage between terminals of discharge time, above-mentioned battery of rated current value of battery of measuring object and residual capacity.
CNB2006100932321A 2005-08-19 2006-06-23 Deterioration judging device and method, computer program Expired - Fee Related CN100535680C (en)

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