CN106130102A - Condition managing device, the equalization method of charge storage element - Google Patents
Condition managing device, the equalization method of charge storage element Download PDFInfo
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- CN106130102A CN106130102A CN201610542890.8A CN201610542890A CN106130102A CN 106130102 A CN106130102 A CN 106130102A CN 201610542890 A CN201610542890 A CN 201610542890A CN 106130102 A CN106130102 A CN 106130102A
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- charge storage
- storage element
- discharge
- voltage
- secondary cell
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910052840 fayalite Inorganic materials 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 16
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 13
- 229910001416 lithium ion Inorganic materials 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000006870 function Effects 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 229910000398 iron phosphate Inorganic materials 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- 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
- H01M10/44—Methods for charging or discharging
-
- H02J7/0022—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- 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
Abstract
The present invention provides a kind of equalization method of condition managing device, charge storage element, is the technology to the ground discharge and recharge of multiple secondary cell equalization.(BMS20) it is the device that is managed of the state of a kind of multiple secondary cells (50) to being connected in series, possess: the magnitude of voltage V of secondary cell (50) is divided the voltameter (24) measured, the ground discharge circuit (26) that discharge and the equalization control portion (44) that be controlled discharge circuit (26) individual to secondary cell (50) point individually, when the magnitude of voltage V of secondary cell (50) each in discharge and recharge reaches reference voltage, equalization control portion (44) makes the electric discharge of this secondary cell (50) start.According to this (BMS20), the magnitude of voltage V of the secondary cell (50) comparing to other makes the situation that the electric discharge of the secondary cell (50) as object starts after reaching reference voltage, the electric discharge that can do sth. in advance the secondary cell (50) as object starts period.
Description
The application is filing date JIUYUE in 2012 4 days, Application No. 201210323500.X, invention entitled " state pipe
Reason device, the equalization method of charge storage element " the divisional application of application for a patent for invention.
Technical field
It is (impartial that invention disclosed in this specification relates to that the capacity of institute's discharge and recharge in multiple charge storage elements carries out equalization
Change) technology.
Background technology
From in the past, make use of repeatedly used charge storage element.Charge storage element by charge and discharge is carried out repeatedly and
Can be used for multiple times, comparing to can not the battery of discharge and recharge, more protection environment and widened it make by being applied to electric motor car etc.
Use field.
In the device using multiple charge storage elements, uneven because of the initial capacity of each charge storage element or degradation speed
Deng, the capacity of charge storage element becomes unbalanced sometimes.If the capacity of charge storage element becomes unbalanced, the most sometimes when charging, 1
The voltage of several charge storage element can prior to or be later than other charge storage element and reach full charge voltage thus charging terminates, it is impossible to
Whole charge storage elements is charged fully.It addition, sometimes when electric discharge, the voltage of 1 or several charge storage element prior to or evening
Charge storage element in other reaches electric discharge end voltage thus electric discharge terminates, it is impossible to charged with being all in whole charge storage elements
Electric power.So, if the capacity of charge storage element becomes unbalanced, then can not give play to the capacity of charge storage element to greatest extent.
In prior art, use the discharge circuit secondary cells unbalanced to capacity such as resistance to discharge and make the appearance of secondary cell
The technology of amount equilibrium is known (such as, quoting document 1).In the art, by according to obtained under no current state
The information of voltage of secondary cell ask for the dump energy capacity of secondary cell, and based on its capacity difference, each secondary cell is carried out
Electric discharge, carrys out the capacity of equalization secondary cell.
Patent documentation 1: Japanese Unexamined Patent Publication 2011-19329 publication
In recent years, fayalite (オ リ PVC Application) based lithium-ion secondary cell (following, fayalite system battery) is as electronic
The secondary cell of car etc. receives publicity.Fayalite system battery is the one of lithium ion battery, employs olivine-type at positive pole
Iron phosphate (acid of オ リ PVC Application type リ Application), negative pole such as employs graphite based material etc..So, in fayalite system battery,
Without using the electrode material of cobalt system as electrode, compare to use the secondary cell of the electrode material of cobalt system, there is cost just
Suitable and that safety is high advantage.
In fayalite system battery, be there is by the combination with negative pole stable (plateau) region, such as, using
In the case of graphite based material is as negative pole, have represent secondary cell residual capacity SOC from 10% to 90% wide
Stability region, this is known.Here, stability region refers to, even if secondary cell SOC change, the voltage of secondary cell is the biggest
Cause constant region.In stability region, it is difficult to estimate the capacity of charge storage element according to the information of voltage of charge storage element.Therefore
And, in the case of the information of voltage using charge storage element carries out equalization to the capacity of charge storage element, it is desirable to use stable
Region beyond region carries out the technology of equalization to the capacity of charge storage element.
On the other hand, fayalite system battery has the region that voltage sharply increases relative to the increase of residual capacity
(hereinafter referred to as region of variation), such as employ graphite based material as negative pole in the case of, representing the surplus of secondary cell
The SOC of covolume amount be 10% area below and more than 90% region in become region of variation, this is known.So,
In the charge storage elements such as the secondary cell in the region that SOC is higher with region of variation, even if the most in charging according to this change
The information of voltage changing charge storage element acquired in region makes charge storage element discharge to want to make charge storage element equalization, in electric power storage
Before the equalization of element terminates, the charging of charge storage element also can terminate.In the prior art, with the end of the charging of charge storage element
The most also the electric discharge making charge storage element terminates, and can not discharge charge storage element fully the most in these cases thus be difficult to
The capacity of charge storage element is carried out equalization.
Summary of the invention
In this manual, the open technology that capacity charged in multiple charge storage elements is carried out equalization.
The state of the disclosedest condition managing device multiple charge storage elements to being connected in series is managed,
Described condition managing device possesses: voltage measurement portion, and the voltage of each charge storage element is measured by individually；Discharge part, it is to institute
State each charge storage element to discharge individually；And equalization control portion, described discharge part is controlled by it, when the institute in discharge and recharge
Stating the voltage of each charge storage element when reaching reference voltage, described equalization control portion makes the electric discharge of this charge storage element start.
In this condition managing device, owing to making this when the voltage of each charge storage element in discharge and recharge reaches reference voltage
The electric discharge of charge storage element starts, and the voltage of the charge storage element therefore comparing to other makes as object after reaching reference voltage again
Charge storage element electric discharge start prior art, the electric discharge that can shift to an earlier date the charge storage element as object starts period.So, energy
Be prone to guarantee for equalization charge storage element discharge time the capacity of multiple charge storage elements is carried out equalization.
In above-mentioned condition managing device, being configured to, described condition managing device is also equipped with: storage part, its with
The voltage of described each charge storage element reaches the precedence correspondence of described reference voltage and has associatedly stored discharge time, described equilibrium control
Described in portion processed goes through and reaches with the voltage of described each charge storage element that the precedence of described reference voltage is corresponding and be associatedly stored
This charge storage element is made discharge time to discharge.
In this condition managing device, owing to using make charge storage element to put the discharge time stored in storage part in advance
Electricity, therefore can easily and early determine the discharge time of each charge storage element.
In above-mentioned condition managing device, it is configured to, is in the situation in charging at the plurality of charge storage element
Under, uprise with described precedence described discharge time and be set longer, it is also possible to be configured to, at the plurality of charge storage element
In the case of in electric discharge, described discharge time is set longer with described precedence step-down.According to this condition managing device,
Set longer discharge time by the charge storage element bigger to capacity, the capacity being charged or discharged can be entered in multiple charge storage elements
Row equalization.
In above-mentioned condition managing device, being configured to, the discharge and recharge to the plurality of charge storage element is repeated
Repeatedly, described equalization control portion use in described storage part stored described discharge time the most described discharge part control
System.According to this condition managing device, by this discharge time repetitive control is used for multiple times, can precision equalization well multiple
The capacity of institute's discharge and recharge in charge storage element.
In above-mentioned condition managing device, being configured to, described condition managing device is also equipped with: timing unit, and it is right
From the voltage of arbitrary charge storage element reach described reference voltage reach described reference voltage to other the voltage of charge storage element
Till time difference carry out timing, described equalization control portion is obtained by described timing unit timing based in this discharge and recharge
The described time difference arrived, was updated the described discharge time of the described storage part used in the discharge and recharge of next time.Root
According to this condition managing device, by the discharge time stored in storage part is updated, the spy with charge storage element can be set
Property corresponding discharge time, can the capacity of institute's discharge and recharge in the precision multiple charge storage element of equalization well.
In above-mentioned condition managing device, being configured to, described condition managing device is also equipped with: timing unit, and it is right
From the voltage of arbitrary charge storage element reach described reference voltage reach described reference voltage to other the voltage of charge storage element
Till time difference carry out timing, described equalization control portion goes through and makes described electric power storage the discharge time corresponding with described time difference
Component discharges.
In this condition managing device, the time difference the voltage of use to each charge storage element reaches reference voltage sets
Determine discharge time.According to this condition managing device, capacity difference based on the charge storage element corresponding with time difference each storage can be set
The discharge time of electric device, the capacity of institute's discharge and recharge in the energy precision multiple charge storage element of equalization well.
In above-mentioned condition managing device, the plurality of charge storage element includes the 1st charge storage element and the 2nd charge storage element,
Described equalization control portion was both configured to: in the case of the plurality of charge storage element is in charging, went through and from institute
State the voltage of the 1st charge storage element and reach the 1st the voltage that reference voltage rises to described 2nd charge storage element reaches reference voltage
Time difference makes described 1st charge storage element electric discharge at corresponding discharge time, it is also possible to be configured to: be at the plurality of charge storage element
In the case of in electric discharge, go through with from the voltage of described 1st charge storage element reach reference voltage to described 2nd charge storage element
The 1st time difference till voltage reaches reference voltage makes described 2nd charge storage element electric discharge at corresponding discharge time.According to this state
Managing device, makes the 1st charge storage element and the discharge time of the 2nd charge storage element equalization owing to using the 1st time difference to set, because of
This can carry out equalization to the capacity of institute's discharge and recharge in the 1st charge storage element and the 2nd charge storage element.
In above-mentioned condition managing device, being configured to, described condition managing device is also equipped with: current measurement portion,
It measures the charging and discharging currents to the plurality of charge storage element in discharge and recharge, and described equalization control portion is to described 1st time
Difference is multiplied by described charging and discharging currents and calculates the capacity difference corresponding with described 1st time difference, and by described capacity difference divided by correspondence
The equalization discharge current of charge storage element set described discharge time.
According to this condition managing device, owing to calculating the 1st charge storage element and according to the 1st time difference and charging and discharging currents
The capacity difference of 2 charge storage elements, and the discharge time of the charge storage element electric discharge making correspondence is set according to this capacity difference, therefore can essence
Spend equalization capacity of institute's discharge and recharge in the 1st charge storage element and the 2nd charge storage element well.Additionally, when calculating capacity difference
" being multiplied by " comprise and go through the situation that charging and discharging currents is integrated by the 1st time difference, when determining discharge time " divided by "
Comprise the situation that with equalization discharge current, capacity difference is carried out differential.
In above-mentioned condition managing device, being configured to, described timing unit is to from starting the plurality of charge storage element
The voltage that rises to described each charge storage element of discharge and recharge reach reference voltage the time that reaches measure, and according to measurement
The time that reaches described in going out carries out timing to described time difference.According to this condition managing device, it is easy to use that measures to reach
To the time, time difference is carried out timing.
In above-mentioned condition managing device, it is configured to, before the control of described discharge part terminates, even if to described
The discharge and recharge of multiple charge storage elements terminates, and described equalization control portion continues to the control of described discharge part.According to this state pipe
Reason device, though due to before the control of the discharge part performed by equalization control portion terminates discharge and recharge to charge storage element terminate
Also continue to the control of discharge part, therefore compare to attend by the end of the discharge and recharge to charge storage element and stop the control of discharge part
Prior art, can ensure that long discharge time, and the capacity of institute's discharge and recharge in multiple charge storage elements can be carried out equalization.
In above-mentioned condition managing device, being configured to, described equalization control portion is from arbitrary charge storage element
Voltage reaches reference voltage to be risen and makes this charge storage element discharge after fiducial time, and exists at the voltage of the plurality of charge storage element
In the case of reaching described reference voltage in described fiducial time, all of the plurality of charge storage element is made not discharge.At base
In the case of in punctual, the voltage of multiple charge storage elements has reached reference voltage, institute's discharge and recharge in these multiple charge storage elements
Capacity is roughly equal.According to this condition managing device, owing to not making each charge storage element discharge individually, therefore can
The difference of the capacity of institute's discharge and recharge in multiple charge storage element is suppressed to become big situation on the contrary because of electric discharge.
In above-mentioned condition managing device, described charge storage element is fayalite based lithium-ion secondary cell, can be with structure
Becoming, in the case of the plurality of charge storage element is in charging, described reference voltage is set to and described for representing
The voltage that more than the 90% of the SOC of the residual capacity of charge storage element is corresponding, it is also possible to be configured to, at the plurality of charge storage element
In the case of in electric discharge, described reference voltage is set to and less than the residual capacity for representing described charge storage element
The voltage of 10% correspondence of SOC.In fayalite based lithium-ion secondary cell, in the region that SOC is more than 90%, voltage
Drastically raising relative to the increase of SOC, the charging of charge storage element terminates sometimes before the equalization of charge storage element terminates.Separately
Outward, in fayalite based lithium-ion secondary cell, be less than in the region of 10% at SOC, the voltage minimizing relative to SOC and
Drastically declining, the electric discharge of charge storage element terminates sometimes before the equalization of charge storage element terminates.In this condition managing device,
Make the electric discharge of this charge storage element start ahead of time when reaching reference voltage by the voltage of each charge storage element in discharge and recharge to be somebody's turn to do
The electric discharge of charge storage element starts period, can be at the SOC of fayalite based lithium-ion secondary cell less than 10% and more than 90%
Region in set reference voltage.
The present invention can also be embodied in the equalization method of the charge storage element using above-mentioned condition managing device to realize.
The state of the equalization method of charge storage element disclosed in this specification multiple charge storage elements to being connected in series equalizes
Changing, the equalization method of described charge storage element has: voltage measuring step, independent to the voltage of each charge storage element in discharge and recharge
Ground is measured；And discharge step, described each charge storage element is discharged individually, in described discharge step, when described each electric power storage
When the voltage of element reaches reference voltage, the electric discharge of this charge storage element is made to start.
It addition, in the equalization method of above-mentioned charge storage element, be configured to, in described discharge step, go through
The precedence corresponding discharge time being associatedly preset of described reference voltage is reached with the voltage of described each charge storage element
This charge storage element is made to discharge.
It addition, in the equalization method of above-mentioned charge storage element, be configured to, the equalization side of described charge storage element
Method also has: timed process, to charge storage element to other reaching described reference voltage from the voltage of arbitrary charge storage element
Voltage reaches the time difference till described reference voltage and carries out timing, in described discharge step, goes through and described time difference pair
Described charge storage element is made the discharge time answered to discharge.
According to the present invention, the capacity of institute's discharge and recharge in multiple charge storage elements can be carried out equalization.
Accompanying drawing explanation
Fig. 1 is the block diagram of charging system (discharge system).
Fig. 2 is the skeleton diagram of discharge circuit.
Fig. 3 is the flow chart of the equalization processing representing the 1st embodiment.
Fig. 4 is the figure of the charge-discharge characteristic representing secondary cell.
Fig. 5 is the figure of the charge-discharge characteristic representing secondary cell.
Fig. 6 is the flow chart of the equalization processing representing the 2nd embodiment.
Fig. 7 is the flow chart of the equalization processing representing the 3rd embodiment.
Fig. 8 is the corresponding table of the precedence in the 3rd embodiment and discharge time.
Fig. 9 is the flow chart of the equalization processing representing the 4th embodiment.
Figure 10 is the corresponding table of the precedence in the 4th embodiment and discharge time.
Symbol description
10: charging system, 12: set of cells, 20:BMS, 22: galvanometer, 24: voltameter, 26: discharge circuit, 30:CPU,
42: timing unit, 44: equalization control portion, 50: secondary cell, HI: equalization discharge current, HT: discharge time, KV: benchmark electricity
Pressure, Δ T: elapsed time, Δ Y: capacity difference
Detailed description of the invention
<embodiment 1>
Hereinafter, use Fig. 1 to Fig. 5 that embodiments of the present invention 1 are described.
1. the composition of state determining apparatus
Fig. 1 is the figure of the composition of the charging system (discharge system) 10 representing present embodiment.Charging system (electric discharge system
System) 10 by set of cells 12, condition managing device (following, BMS) 20 and charger (load) 18 composition.Set of cells 12 is in inside
Comprise the multiple secondary cells 50 (example of charge storage element) being connected in series.Set of cells 12 is filled by being connected with charger 18
Electricity, and be discharged by being connected with load 18.The BMS20 magnitude of voltage V to each secondary cell 50 of the set of cells 12 in charging
Or current value I etc. carries out monitoring the residual capacity (SOC) managing the charging and discharging state representing secondary cell 50, thus to SOC
Carry out equalization.
In the present embodiment, it is shown that (following, fayalite system is electric to use fayalite based lithium-ion secondary cell
Pond) it is used as the example of secondary cell 50.This secondary cell 50 is the one of lithium ion battery, employs olivine-type at positive pole
Iron phosphate, and employ graphite based material at negative pole.This secondary cell 50 has following region as shown in Figure 4: at SOC for being less than
The charging of 10% initial (electric discharge latter stage) and the charging latter stage (electric discharge is initial) that SOC is more than 90%, cell voltage relative to
The increase of SOC and steeply rise.It addition, also have following region (after, referred to as stability region): SOC be more than 10% and
Charging mid-term less than 90% (electric discharge mid-term), the cell voltage increase relative to SOC and constant.
BMS20 includes: central processor (following, CPU) 30, simulate a digital conversion machine (following, ADC) 34, electric current
Meter (example in current measurement portion) 22, voltameter (example in voltage measurement portion) 24, discharge circuit (example of discharge part) 26, with
And thermometer 28.
CPU30 is built-in with the memorizer (example of storage part) 32 of ROM or RAM etc., in memory 32 storage have for
The various programs that each action constituted of BMS20 is controlled.CPU30 is used as meter according to the program read from memorizer 32
Time the function such as portion 42, equalization control portion 44, and the BMS20 carrying out comprising discharge circuit 26 in the control in each portion.
Thermometer 28 measures with contact or the contactless temperature to set of cells 12, and the temperature that will measure
It is stored in memorizer 32.Voltameter 24, as in figure 2 it is shown, be directly connected to via the two ends of wiring 54 with each secondary cell 50, and often
Every specified time limit, the magnitude of voltage V of the secondary cell 50 in discharge and recharge is measured individually.Containing N number of (N:2 in set of cells 12
Secondary cell 50A above), 50B, 50N, the voltameter 24 voltage VA to each secondary cell 50, VB, VN's
Magnitude of voltage measures respectively.These magnitudes of voltage V measured is sent to ADC34 by voltameter 24.
In the wiring 54 of connecting secondary battery 50 and voltameter 24, it is provided with for putting that secondary cell 50 is discharged individually
Electricity circuit 26.As in figure 2 it is shown, in discharge circuit 26, it is provided with being connected between the wiring 54 at two ends of each secondary cell 50
For the discharge circuit 26A that each secondary cell 50 is discharged, 26B, 26N.Each discharge circuit 26 is by resistance R and opens
Close Q to constitute.The switch Q of discharge circuit 26 is controlled its opening and closing by the CPU30 as equalization control portion 44 function, if
Switch Q is set to closure state by CPU30, then electric current flows via wiring 54 and resistance R from secondary cell 50, corresponding secondary
Battery 50 will electric discharge.If it addition, switch Q is set to open mode by CPU30, then the electric discharge carrying out self-corresponding secondary cell 50 will stop
Only.
Galvanometer 22 to measuring for connecting the electric current flowed in set of cells 12 and the wiring 52 of charger 18, and
The current value of the charging and discharging currents ZI flowed publicly in secondary cell 50 is measured.It addition, galvanometer 22 to via
The current value IA of electric current (following, the equalization discharge current) HI that wiring 54 is discharged individually from each secondary cell 50,
IB, IN measure.These current values I measured is sent to ADC34 by galvanometer 22.
ADC34 is connected with galvanometer 22, voltameter 24 and CPU30, will be as from galvanometer 22 and voltameter 24
The current value I and magnitude of voltage V of the analog data sent is transformed into numerical data, and by the current value I after conversion and magnitude of voltage V
It is stored in memorizer 32.Use as the CPU30 of the function such as timing unit 42 this current value I of being stored in memorizer 32 with
And magnitude of voltage V performs equalization processing described later.
2. equalization processing
Use Fig. 3 to Fig. 5 that the equalization processing conducted in the BMS20 is described when being charged set of cells 12.
This equalization processing accompany the charging control to set of cells 12 and processes and be performed.Fig. 3 represents performed in CPU30
Flow chart to the equalization processing of set of cells 12.
Start from charger 18 to the supply of electric power of set of cells 12, then if set of cells 12 is connected by user with charger 18
CPU30 not only performs charging control process and also performs equalization processing.CPU30 is when starting equalization processing, to each secondary electricity
The magnitude of voltage V in pond 50 measures, and detects whether magnitude of voltage V reaches reference voltage KV (S2: no).In the present embodiment,
As shown in Figure 4, magnitude of voltage corresponding to charging latter stage that reference voltage KV is set to SOC is more than 90%.
CPU30, when the magnitude of voltage V detecting any one secondary cell 50 reaches reference voltage KV (S2: yes), starts
Time reaching from this is measured (S4).As the CPU30 of equalization control portion 44 function from the beginning of timing
Rise through ST fiducial time, start to have reached the electric discharge (S5) of the secondary cell 50 of reference voltage KV.Specifically, CPU30
Not only the switch Q of the discharge circuit 26 corresponding with the 1st secondary cell 50 is set to closure state, also starts to set from by this switch Q
Measurement for the time that closure state rises.It addition, as the CPU30 of timing unit 42 function, to from said one secondary electricity
The magnitude of voltage V in pond 50 reaches the secondary cell 50 that reference voltage KV rises, rises the slowest to magnitude of voltage V in multiple secondary cells 50
Elapsed time (example of time difference) the Δ T that reaches till reference voltage KV of magnitude of voltage V carry out timing.
In the following description, in order to make it easy to understand, the secondary cell 50 that magnitude of voltage V reaches reference voltage KV the earliest sets
It is the 1st secondary cell 50, and the secondary cell 50 that magnitude of voltage V reaches reference voltage KV the latest is set to the 2nd secondary cell 50, with
This illustrates the equalization processing in the 1st secondary cell the 50 and the 2nd secondary cell 50.It is, the 1st secondary cell 50 is set to
(that is, SOC is big) secondary cell that in multiple secondary cells 50, magnitude of voltage V rises the earliest, is set to multiple by the 2nd secondary cell 50
In secondary cell 50, magnitude of voltage V rises the latest the secondary cell of (that is, SOC is little).
As it is shown in figure 5, the magnitude of voltage of the 1st secondary cell 50 is set to magnitude of voltage V1, by the magnitude of voltage of the 2nd secondary cell 50
It is set to magnitude of voltage V2, and the process reaching reference voltage KV to magnitude of voltage V2 reference voltage KV being reached from magnitude of voltage V1
Time is set to elapsed time (example of the 1st time difference) Δ T1.Additionally, in the following description, by making the 1st secondary cell 50
It is applied to each secondary cell 50 beyond the 2nd secondary cell 50, can carry out as whole secondary cells 50 that are multiple and that exist
Explanation.
CPU30 not only monitors whether magnitude of voltage V2 reaches reference voltage KV, and also the magnitude of voltage V's of supervision secondary cell 50 is total
Whether i.e. total voltage reaches charging terminal voltage (S6, S8).Before total voltage reaches charging terminal voltage, magnitude of voltage V2 reaches
In the case of reference voltage KV (S6: be, S8: no), CPU30 carries out timing (S10) to elapsed time Δ T1.And, if right
Elapsed time Δ T1 carries out timing, then set and oneself has started HT discharge time that the 1st secondary cell 50 of electric discharge discharges
(S12).CPU30 goes through elapsed time Δ T1 and is integrated charging current ZI flowing into set of cells 12, calculates the 1st two
Capacity difference Δ Y1 between primary cell the 50 and the 2nd secondary cell 50.It addition, be previously stored with in memory 32 and the 1st two time
The equalization discharge current HI (or its characteristic) of the discharge circuit 26 of battery 50 correspondence, CPU30 are to be stored in memorizer 32
Equalization discharge current HI carries out differential to determine HT discharge time to capacity difference Δ Y1.Discharge time HT can also be referred to as
SOC to the 1st secondary cell the 50 and the 2nd secondary cell 50 carries out the equalization control time of homogenization.
Capacity difference Δ Y1=elapsed time Δ T1* charging current ZI
Discharge time HT=capacity difference Δ Y1/ equalization discharge current HI
On the other hand, in the case of before magnitude of voltage V2 reaches reference voltage KV, total voltage has reached charging terminal voltage
(S6: no, S8: yes), CPU30 does not carries out timing to elapsed time Δ T1, and HT discharge time is set as prespecified rule
Definite value KT (S14).
After the setting of HT discharge time, CPU30 standby from switch Q is set to closure state through HT discharge time
(S18: no).Even if the total voltage of secondary cell 50 has reached the feelings of charging terminal voltage in the electric discharge of the 1st secondary cell 50
Under condition, CPU30 does not continues the electric discharge of the 1st secondary cell 50 with not stopping the electric discharge of the 1st secondary cell 50.Then, if through putting
Electricity time HT (S18: yes), then CPU30 terminates the electric discharge (S20) of the 1st secondary cell 50, thus terminates equalization processing.
3. the effect of present embodiment
(1) in the BMS20 of present embodiment, when the magnitude of voltage V of the 1st secondary cell 50 reaches reference voltage KV, open
Begin the electric discharge of this secondary cell 50.So, reach benchmark with the magnitude of voltage V of secondary cell 50 at other as prior art
The situation making the electric discharge of the 1st secondary cell 50 start after voltage KV is different, can make the electric discharge of this secondary cell 50 other
The magnitude of voltage V of secondary cell 50 begins to before reaching reference voltage KV, thus energy in the charging control process to set of cells 12
The electric discharge of the 1st secondary cell 50 ahead of time starts period.
Employ fayalite based lithium-ion secondary cell the most in the present embodiment and be used as secondary cell 50, and
Set the magnitude of voltage corresponding with the latter stage of charging that SOC is more than 90% and be used as reference voltage KV.So, at secondary cell 50
After reference voltage KV, because of a little increase of SOC, the SOC of secondary cell 50 is prone to rise to close to 100%, or, two
The magnitude of voltage V of primary cell 50 easily reaches the terminal voltage corresponding with substantially the 100% of SOC, at other secondary cell 50
Voltage is prone to before reaching reference voltage terminate the charging to this secondary cell 50.
In this BMS20, owing to starting this secondary electricity when the magnitude of voltage V of the 1st secondary cell 50 reaches reference voltage KV
The electric discharge in pond 50, is thus susceptible to guarantee the discharge time of the 1st secondary cell 50, it is possible to suppress the shadow of the secondary cell 50 because of other
Ring and make the 1st secondary cell 50 not to be substantially discharged thus charged SOC in multiple secondary cells 50 can not be equalized
Change such state of affairs to occur.
(2) in the BMS20 of present embodiment, the elapsed time of timing due to the secondary cell 50 actual according to use
Δ T and the equalization discharge current HI flowed in actual discharge circuit 26 determines HT discharge time, therefore can precision
Determine HT discharge time well, the SOC balance of multiple secondary cells 50 can be charged.
(3) in the BMS20 of present embodiment, whether reach charging terminal voltage with the total voltage of secondary cell 50 thus
Charging finishes unrelated, as long as the electric discharge of secondary cell 50 does not terminates the most or not equalization processing.So, compare to existing skill
The situation that art makes the equalization processing of secondary cell 50 terminate like that in the case of finishing the charging of set of cells 12 simultaneously,
SOC charged in multiple secondary cells 50 is carried out equalization with can ensure that HT longer discharge time.
The most in the present embodiment, employ fayalite based lithium-ion secondary cell and be used as secondary cell 50,
And set and be used as reference voltage KV with magnitude of voltage corresponding to charging latter stage that SOC is more than 90%.At fayalite system lithium
In ion secondary battery, in the charging latter stage that SOC is more than 90%, cell voltage steeply rises relative to the increase of SOC.Therefore
And, at secondary cell 50 after reference voltage KV, because of a little increase of SOC, the magnitude of voltage V of secondary cell 50 is prone to drastically
Ground rises, it is easy to terminate set of cells 12 before total voltage reaches charging terminal voltage thus terminates the electric discharge of secondary cell 50
Charging.
In this BMS20, with to the charging of set of cells 12, whether oneself terminates unrelated, as long as the electric discharge of secondary cell 50 is not tied
Bundle does not the most make equalization processing terminate.So, can go through to set by each secondary cell 50 discharge time HT to secondary
Battery 50 reliably discharges, and can charge the SOC balance of multiple secondary cells 50.
<embodiment 2>
Use Fig. 6 that embodiments of the present invention 2 are described.In the present embodiment, fill for using in embodiment 1
Electricity system 10 and the content that illustrates, use discharge system 10 to illustrate.It is, employ discharge system 10 for subsidiary
Control of discharge process and the equalization processing that performs illustrates.
In the present embodiment, in the diagram as shown in single dotted broken line, reference voltage KV is set to SOC as being less than
The magnitude of voltage corresponding to electric discharge latter stage of 10%.In the present embodiment, also magnitude of voltage V is reached the earliest the secondary of reference voltage KV
Battery 50 is set to the 1st secondary cell 50, and the secondary cell 50 that magnitude of voltage V reaches reference voltage KV the latest is set to the 2nd two time
Battery 50.It is, the 1st secondary cell 50 is set to that magnitude of voltage V in multiple secondary cell 50 declines the earliest (that is, SOC is little
) secondary cell, the 2nd secondary cell 50 is set to magnitude of voltage V in multiple secondary cell 50 and declines the latest (that is, SOC is big)
Secondary cell.In the following description, about the content identical with embodiment 1, the record repeated is omitted.
1. equalization processing
Fig. 6 is the flow chart of the equalization processing representing in CPU30 performed present embodiment.
If as the CPU30 of timing unit 42 function detect the 1st secondary cell 50 magnitude of voltage V1 oneself reach benchmark
Voltage KV (S2: yes), then start the measurement (S4) of time from this reaches.Then, CPU30 confirms the 2nd secondary cell 50
Whether magnitude of voltage V2 reaches reference voltage KV (S22: no), if the magnitude of voltage V2 of the 2nd secondary cell 50 reaches reference voltage KV
(S22: yes), then to the elapsed time reaching reference voltage KV to magnitude of voltage V2 reaching reference voltage KV from magnitude of voltage V1
Δ T1 carries out measuring (S10: no).Through ST fiducial time reach reference voltage KV from magnitude of voltage V2, as equalization
The CPU30 of control portion 44 function starts the electric discharge (S24) of the 2nd secondary cell 50.
CPU30 sets HT discharge time for discharging the 2nd secondary cell 50 according to elapsed time Δ T1, and
Going through set HT discharge time makes each secondary cell 50 discharge (S18, S26).Additionally, set according to elapsed time Δ T1
2nd secondary cell 50 discharge time HT process, except using the equalization discharge current HI corresponding with the 2nd secondary cell 50
In addition, with set the 1st secondary cell 50 according to elapsed time Δ T1 discharge time HT process identical, therefore omit repeat
Explanation.
2. the effect of present embodiment
(1) in the BMS20 of present embodiment, when the magnitude of voltage V of the 2nd secondary cell 50 reaches reference voltage KV, open
Begin the electric discharge of this secondary cell 50.So, to set of cells 12 control of discharge process in, the 2nd secondary cell 50 can be done sth. in advance
Electric discharge start period.
(2) in the present embodiment, employ fayalite based lithium-ion secondary cell and be used as secondary cell 50, and set
Having determined with SOC is that magnitude of voltage corresponding to electric discharge latter stage less than 10% is used as reference voltage KV.So, at secondary cell 50 warp
After crossing reference voltage KV, because of a little minimizing of SOC, the SOC of secondary cell 50 is prone to drop to substantially 0%, or, secondary electricity
The magnitude of voltage V in pond 50 easily reaches the terminal voltage corresponding with substantially the 0% of SOC, and the voltage at other secondary cell 50 reaches
It is prone to terminate the electric discharge to this secondary cell 50 before reference voltage.
In this BMS20, owing to starting this secondary electricity when the magnitude of voltage V of the 2nd secondary cell 50 reaches reference voltage KV
The electric discharge in pond 50, therefore, it is possible to suppression makes the 2nd secondary cell 50 not to be substantially discharged because of the impact of other secondary cell 50
Thus can not be to the generation of such state of affairs of discharging of the SOC balance of these secondary cells 50 multiple ground.
(3) in the BMS20 of present embodiment, the elapsed time of timing due to the secondary cell 50 actual according to use
Δ T and the equalization discharge current HI flowed in actual discharge circuit 26 determines HT discharge time, therefore can precision
Determine HT discharge time well, the SOC balance of multiple secondary cells 50 can be discharged.
<embodiment 3>
Use Fig. 7 and Fig. 8 that embodiments of the present invention 3 are described.In the charging system 10 of present embodiment, based on
The on this point that the discharge time prestored in memorizer 32, HT being to set HT discharge time, set with in equalization processing
Discharge time, the charging system 10 of embodiment 1 of HT was different.In the following description, about in identical with embodiment 1
Hold, omit the record repeated.
1. equalization processing
Fig. 7 is the flow chart of the equalization processing representing in CPU30 performed present embodiment.
If the CPU30 as timing unit 42 function detects that the magnitude of voltage V1 of the 1st secondary cell 50 has reached benchmark
Voltage KV (S2: yes), then start the measurement (S4) of time from this reaches.Then, CPU30 not only monitors and starts from timing
Whether through ST fiducial time, also monitor whether the magnitude of voltage V2 of the 2nd secondary cell 50 reaches reference voltage KV (S32, S6).Separately
Outward, CPU30 for comprising the 1st, whole secondary cells 50 of the 2nd secondary cell 50 have reached benchmark to detect magnitude of voltage V
The precedence of the secondary cell 50 of voltage KV, and this precedence is temporarily stored in memorizer 32.
In the case of starting from timing, before fiducial time ST, magnitude of voltage V2 has reached reference voltage KV (S32:
No, S6: yes), it is, in the case of within fiducial time ST, whole secondary cells 50 has reached reference voltage KV,
CPU30 is judged as whole secondary cells 50, and oneself is charged by equalization.In the case, CPU30 is to whole secondary cells
50 do not carry out terminating equalization processing with discharging.
On the other hand, before magnitude of voltage V2 reaches reference voltage KV from timing start have passed through the situation of ST fiducial time
Under (S32: be, S6: no), start the electric discharge of the 1st secondary cell 50 as the CPU30 of equalization control portion 44 function
(S5).Then, use in memorizer 32 stored discharge time HT to set HT discharge time of each secondary cell 50
(S34)。
The most shown in dotted line, in the present embodiment, in the memorizer 32 of CPU30, storage has HT discharge time.
As shown in Figure 8, the precedence of the secondary cell 50 that HT discharge time and magnitude of voltage V has reached reference voltage KV is corresponding is associatedly deposited
Storage, and be set to: along with the precedence of secondary cell 50 uprises, discharge time, HT was elongated.
CPU30 will in memory 32 corresponding to each secondary cell 50 precedence and HT stored discharge time is set as
HT discharge time of each secondary cell 50, and go through set HT discharge time each secondary cell 50 is discharged
(818, S20), and terminate equalization processing.
In charging system 10, set of cells 12 is charged repeatedly repeatedly, CPU30 whenever the charging of set of cells 12 repeatedly
Charging control processes, equalization processing repeatedly.CPU30, in the case of equalization processing repeatedly, uses in memorizer 32 and is deposited
HT discharge time of storage carrys out equalization processing repeatedly.
2. the effect of present embodiment
(1) in the BMS20 of present embodiment, owing to reaching benchmark electricity according to the magnitude of voltage V of secondary cell 50 in charging
The pressure precedence of KV and be pre-stored within memorizer 32 discharge time HT to set the discharge time of each secondary cell 50
HT, therefore can easily and early determine HT discharge time of each secondary cell 50.
(2) in the BMS20 of present embodiment, by using HT discharge time stored in memorizer 32 to come the most equal
Weighing apparatusization processes, can relax memorizer 32 is stored discharge time HT and multiple secondary cell 50 between SOC uneven
Difference, thus the SOC of multiple secondary cells 50 is charged with carrying out equalization.
(3) on the other hand, in the BMS20 of present embodiment, within fiducial time ST, whole secondary cells 50 reaches
In the case of SOC charged in reference voltage KV and whole charge storage elements is almost equal, to whole secondary cells 50
Do not carry out make use of the electric discharge of discharge circuit 26.So, storage has the bigger time to be used as discharge time in memory 32
In the case of HT is such, it is allowed to discharge by going through HT discharge time stored in memorizer 32, can suppress multiple on the contrary
SOC charged in secondary cell 50 becomes uneven.
<embodiment 4>
Use Fig. 9 and Figure 10 that embodiments of the present invention 4 are described.In the present embodiment, in embodiment 3
Use charging system 10 and the content that illustrates, use discharge system 10 to illustrate.It is, employ electric discharge for subsidiary
The equalization processing that the control of discharge of system 10 processes and performs illustrates.
In the present embodiment, reference voltage KV is set to SOC is voltage corresponding to electric discharge latter stage less than 10%
Value.It addition, in the present embodiment, the secondary cell 50 that magnitude of voltage V reaches reference voltage KV the earliest is set to the 1st secondary cell
50, and the secondary cell 50 that magnitude of voltage V reaches reference voltage KV the latest is set to the 2nd secondary cell 50.In the following description,
For the content identical with embodiment 1 and embodiment 3, omit the record repeated.
1. equalization processing
Fig. 9 represents the flow chart of the equalization processing of present embodiment performed in CPU30.
Before magnitude of voltage V2 reaches reference voltage KV from timing start have passed through ST fiducial time in the case of (S32:
It is, S6: no), the magnitude of voltage V2 as standby 2nd secondary cell 50 of CPU30 of timing unit 42 function reaches reference voltage
KV (S42: no).Then, if the voltage of the 2nd secondary cell 50 detected as the CPU30 of equalization control portion 44 function
Value V2 has reached reference voltage KV (S42: yes), then start the electric discharge (S24) of the 2nd secondary cell 50.And, set the 2nd two time
HT discharge time (S34) of battery 50.
As shown in Figure 10, HT discharge time has reached the two of reference voltage KV with magnitude of voltage V in the memorizer 32 of CPU30
The precedence correspondence of primary cell 50 is associatedly stored, and is set to: along with the precedence step-down of secondary cell 50, discharge time HT
Elongated.
The precedence ground HT stored discharge time corresponding to each secondary cell 50 in memory 32 is set as by CPU30
HT discharge time of each secondary cell 50, and go through set HT discharge time each secondary cell 50 is discharged
(S18, S20), and terminate equalization processing.Set of cells 12 is used HT discharge time stored in memorizer 32 to come by CPU30
Equalization processing repeatedly.
2. the effect of present embodiment
In the BMS20 of present embodiment, owing to reaching reference voltage KV according to the magnitude of voltage V of secondary cell 50 in electric discharge
Precedence and prestore in memory 32 discharge time HT to set HT discharge time of each secondary cell 50, because of
This can determine HT discharge time of each secondary cell 50 early.
<other embodiment>
The present invention is not limited to the embodiment illustrated by above-mentioned description and accompanying drawing, such as following various forms
It is also contained in the range of the technology of the present invention.
(1) in the above-described embodiment, it is shown that charging system (discharge system) 10 has 1 BMS20 and by BMS20
1 CPU30 being had is to perform the example of the function in timing unit 42, equalization control portion 44 etc., but the present invention is not limited to
This.Such as, both can be made up of each portion CPU, BMS etc. different from each other, independent equipment etc. can be used again to constitute this
A little each several parts.
(2) in the above-described embodiment, to using the graphite based material fayalite system battery for negative pole to be used as two
The example of primary cell 50 is illustrated, but the present invention is not limited to this.Such as, have the magnitude of voltage increase relative to SOC/
Other the battery in the region reduced and increase sharp/reduce could be used that.In the case, charge and discharge based on each battery
Electrical characteristics set reference voltage KV as one sees fit.
(3) in above-mentioned embodiment 1,2, when elapsed time Δ T is carried out timing, despite from any one secondary
The magnitude of voltage V of battery 50 has reached reference voltage KV and has played the measurement of time started but it also may process (electric discharge control from charging control
System process) started the measurement time.It is, the CPU30 as timing unit 42 function processes (electric discharge from charging control
Control processes) started the time is carried out timing, measure each secondary cell 50 and reach the time that reaches of reference voltage KV, and general
Elapsed time Δ T carries out timing as its difference reaching the time.
(4) in above-mentioned embodiment 1,2, use is previously stored with corresponding with each secondary cell 50 in memory 32
The example of the equalization discharge current HI of discharge circuit 26 is illustrated, but the equalization electric discharge stored in memorizer 32
Electric current HI both can carry out calculated in advance according to the constant of the resistance R used in discharge circuit 26 and store, it is possible to use put
Electricity circuit 26 is measured by galvanometer etc. and is stored in advance.
(5) in above-mentioned embodiment 1, the total voltage at multiple secondary cells 50 is used to reach charging terminal voltage
In the case of HT discharge time is set as that the example of setting KT is illustrated but it also may each secondary cell 50 is set
Terminal voltage, and in the case of any one secondary cell 50 has reached terminal voltage, HT discharge time is set as setting
KT。
(6) in above-mentioned embodiment 3,4, use set of cells 12 repeated charge repeatedly and is in the case utilized and deposit
HT discharge time stored in reservoir 32 carrys out repeatedly the example of equalization processing and is illustrated, but is using HT discharge time
In the case of carrying out repeatedly equalization processing, HT discharge time that can be stored in the most more new memory 32.It is,
The precedence of the secondary cell 50 that magnitude of voltage V is reached reference voltage KV by CPU30 reaches with the magnitude of voltage V1 from the 1st secondary cell 50
The elapsed time correspondence that reference voltage KV rises reaching reference voltage KV to magnitude of voltage V associatedly detects.Furthermore, it is possible to
Time difference based on the difference as this elapsed time updates HT discharge time.CPU30 is based in this equalization processing
Detected time difference updates HT discharge time to use in the equalization processing of next time.Thus, memorizer can be made
HT discharge time stored in 32 is suitable for the characteristic of the deterioration comprising secondary cell 50, can be to multiple secondary cells 50
SOC balanceization ground discharge and recharge.
(7) in the case of HT discharge time stored in memorizer 32 is updated, both can be according to precedence phase
The time difference in the elapsed time of adjacent secondary cell 50 is come to the mode that the discharge time stored in memorizer 32, HT was directly proportional
It is updated, it is possible to use statistical maneuver updates HT discharge time.
Claims (20)
1. a condition managing device, is managed the state of the multiple charge storage elements being connected in series, and described condition managing fills
Put and possess:
Voltage measurement portion, the voltage of each charge storage element is measured by individually；
Discharge part, described each charge storage element is discharged by individually；With
Equalization control portion, described discharge part is controlled by it,
Described charge storage element is fayalite based lithium-ion secondary cell,
When the voltage of the described each charge storage element in discharge and recharge reaches reference voltage, described equalization control portion only makes this electric power storage
Element starts electric discharge.
Condition managing device the most according to claim 1, wherein,
Described reference voltage is the voltage corresponding with more than SOC90%.
Condition managing device the most according to claim 1, wherein,
Described reference voltage is and the voltage corresponding less than SOC10%.
Condition managing device the most according to claim 1, wherein,
Described condition managing device is also equipped with storage part, and this storage part reaches described benchmark electricity with the voltage of described each charge storage element
The precedence correspondence of pressure has associatedly stored discharge time,
Described equalization control portion goes through the corresponding association of precedence reaching described reference voltage with the voltage of described each charge storage element
Described discharge time of being stored make this charge storage element discharge.
Condition managing device the most according to claim 4, wherein,
In the case of the plurality of charge storage element is in charging, uprises with described precedence described discharge time and be set
Longer.
Condition managing device the most according to claim 4, wherein,
In the case of the plurality of charge storage element is in electric discharge, described discharge time is set with described precedence step-down
Longer.
7. according to the condition managing device according to any one of claim 4～6, wherein,
Discharge and recharge to the plurality of charge storage element is repeated a number of times,
Described equalization control portion uses described discharge part is repeated the described discharge time stored in described storage part
Control.
Condition managing device the most according to claim 7, wherein,
Described condition managing device is also equipped with timing unit, and this timing unit reaches described benchmark electricity to the voltage from arbitrary charge storage element
The voltage having pressed the charge storage element to other reaches the time difference described reference voltage and carries out timing,
Described equalization control portion, based on the described time difference obtained by described timing unit timing in this discharge and recharge, comes
The described discharge time of the described storage part used in the discharge and recharge of next time is updated.
Condition managing device the most according to claim 1, wherein,
Described condition managing device is also equipped with timing unit, and this timing unit reaches described benchmark electricity to the voltage from arbitrary charge storage element
The voltage having pressed the charge storage element to other reaches the time difference described reference voltage and carries out timing,
Described equalization control portion goes through and makes the discharge time corresponding with described time difference described charge storage element discharge.
Condition managing device the most according to claim 9, wherein,
The plurality of charge storage element includes the 1st charge storage element and the 2nd charge storage element,
In the case of the plurality of charge storage element is in charging, described equalization control portion goes through and from described 1st electric power storage
The voltage of element reaches the 1st time difference pair the voltage that reference voltage rises to described 2nd charge storage element reaches reference voltage
Make described 1st charge storage element electric discharge the discharge time answered.
11. condition managing devices according to claim 9, wherein,
The plurality of charge storage element includes the 1st charge storage element and the 2nd charge storage element,
In the case of the plurality of charge storage element is in electric discharge, described equalization control portion goes through and from described 1st electric power storage
The voltage of element reaches the 1st time difference pair the voltage that reference voltage rises to described 2nd charge storage element reaches reference voltage
Make described 2nd charge storage element electric discharge the discharge time answered.
12. according to the condition managing device described in claim 10 or 11, wherein,
Described condition managing device is also equipped with current measurement portion, and this current measurement portion is measured in discharge and recharge the plurality of electric power storage unit
The charging and discharging currents of part,
Described 1st time difference is multiplied by described charging and discharging currents and calculates and described 1st time difference pair by described equalization control portion
The capacity difference answered, and when described capacity difference is set described electric discharge divided by the equalization discharge current of corresponding charge storage element
Between.
13. according to the condition managing device according to any one of claim 9～11, wherein,
Described timing unit reaches base to from the discharge and recharge starting the plurality of charge storage element to the voltage of described each charge storage element
The time that reaches till quasi-voltage measures, and counts described time difference according to reaching the time described in measuring
Time.
14. according to the condition managing device according to any one of claim 1～6, wherein,
Before the control of described discharge part terminates, even if the discharge and recharge to the plurality of charge storage element terminates, described equalization control
Portion processed continues to the control of described discharge part.
15. according to the condition managing device according to any one of claim 1～6, wherein,
Described equalization control portion makes this storage reaching reference voltage from the voltage of arbitrary charge storage element after fiducial time
Electric device discharges, and reaches the situation of described reference voltage within described fiducial time at the voltage of the plurality of charge storage element
Under, make all of the plurality of charge storage element not discharge.
16. condition managing devices according to claim 1, wherein,
In the case of the plurality of charge storage element is in charging, described reference voltage is set to and for representing described storage
The voltage that more than the 90% of the SOC of the residual capacity of electric device is corresponding.
17. condition managing devices according to claim 1, wherein,
In the case of the plurality of charge storage element is in electric discharge, described reference voltage is set to and less than for representing
State the voltage of 10% correspondence of the SOC of the residual capacity of charge storage element.
The equalization method of 18. 1 kinds of charge storage elements, carries out equalization to the state of the multiple charge storage elements being connected in series, described
The equalization method of charge storage element has:
Voltage measuring step, measures individually to the voltage of each charge storage element in discharge and recharge；With
Discharge step, discharges individually to described each charge storage element,
Described charge storage element is fayalite based lithium-ion secondary cell,
In described discharge step, when the voltage of described each charge storage element reaches reference voltage, this charge storage element is only made to start
Electric discharge.
The equalization method of 19. charge storage elements according to claim 18, wherein,
In described discharge step, go through the corresponding association of precedence reaching described reference voltage with the voltage of described each charge storage element
Discharge time of being preset make this charge storage element discharge.
The equalization method of 20. charge storage elements according to claim 18, wherein,
The equalization method of described charge storage element also has timed process, and the voltage from arbitrary charge storage element is reached by this timed process
Play the voltage of the charge storage element to other to described reference voltage to reach the time difference described reference voltage and carry out timing,
In described discharge step, go through and make the discharge time corresponding with described time difference described charge storage element discharge.
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| JP6965827B2 (en) * | 2018-05-11 | 2021-11-10 | トヨタ自動車株式会社 | Lithium-ion battery diagnostic method and lithium-ion battery diagnostic device |
| CN117559614B (en) * | 2024-01-11 | 2024-04-02 | 西安奇点能源股份有限公司 | Charging and discharging balance control method for serial battery PACK |
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| US20110011653A1 (en) * | 2009-07-17 | 2011-01-20 | Mami Mizutani | Assembled battery unit and vehicle |
| WO2011102241A1 (en) * | 2010-02-16 | 2011-08-25 | 三菱電機株式会社 | Cell capacity adjusting device |
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