CN105158701B - Secondary cell detecting system and current-balance type control method - Google Patents
Secondary cell detecting system and current-balance type control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 68
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Abstract
The embodiment of the invention discloses a kind of secondary cell detecting system, including：Interior power network, electric energy buffer module, master controller, and the detected unit comprising secondary cell, the detected unit needs to carry out charging at least one times in detection process and discharged at least one times, allows to be shelved when being charged and discharged conversion, the master controller is configured to, based on the current threshold on interior power network, maximum charge number and maximum electric discharge number are determined；The detected unit for starting maximum charge number is charged, and is started the maximum detected unit of discharge count purpose and is discharged；And in the case where the energy value of detecting system is less than energy threshold, increasing the detected number of unit of charging so that detecting system supplements energy.Also disclose the method for controlling the detecting system.By the detecting system and control method, the security risk of secondary cell detecting system is reduced.
Description
Technical field
The present invention relates to the detection of the charge-discharge performance of secondary cell, more particularly, to a kind of secondary cell detecting system
And current-balance type control method.
Background technology
In various portable electric appts, the use of battery is indispensable.In various batteries, chemical cell is with its skill
The advantages such as art is ripe, cheap, discharge performance stabilization, energy conversion efficiency height, as a most widely used class.According to electricity
The specifically used mode and the difference of character of use in source, chemical cell can be divided into four classes again：Galvanic cell, battery, deposit
Battery and fuel cell, wherein, galvanic cell is also known as one-shot battery, and it can only carry out a discharge process；And battery is also known as
For secondary cell, it is after discharge process terminates, the state that can be returned to by way of charging before electric discharge, and then realizes many
Secondary discharge and recharge.In order to ensure the product quality of battery, quality testing department and manufacturing enterprise can carry out battery detecting work.And due to
Can multiple discharge and recharge characteristic, the detection work of secondary cell and other batteries simultaneously differ, with its it is exclusive the characteristics of.
There are a variety of existing secondary cell detecting systems, such as resistance-type power consumption secondary cell detecting system.Should
System is the detecting system of earliest mature, and it consumes the electric discharge energy of secondary cell using resistance or other dissipative cells
Amount.Although having the advantages that loop structure is simple, technically easily realize and cost is low, because this detecting system will
The energy that secondary cell discharges when discharging all is converted into heat energy by dissipative cell, can cause substantial amounts of energy dissipation, and meeting
Cause temperature-rise effect considerable in battery detecting factory building.
It is more widely energy feedback type secondary cell detecting system to use at present.This kind of system utilizes rectification circuit,
Energy can be realized from secondary cell to the flowing in external power grid direction.So, when battery charges, energy inputs electricity by external power grid
Pond, in battery discharge, energy flows into external power grid from battery, realizes the recovery of battery discharging energy, it is to avoid because battery is put
The energy dissipation problem that the energy discharged when electric is caused by resistance consumption.But, this kind of system energy feedback is inefficient, returns
Often there is serious distortion in the waveform for being fed to external power grid.Also, existing energy feedback type secondary cell detecting system is often
The energy discharged when secondary cell is discharged is directly output to carry out energy feedback by the way of national grid, and this has one
Fixed security risk.Because in secondary cell detection process, system is possible to directly provide energy to national grid, for example,
In the most extreme case, all detected batteries are in discharge condition, and detecting system can export a large amount of to national grid
Energy, and mostly distortion current.In fact, for the consideration of law and safety, only power-generating enterprise can be to state's household electrical appliances
Net power supply, remaining enterprise can only use from national grid power taking and can not be powered to national grid, therefore this to national grid
Export the situation of distortion current and be not allowed to.Therefore, the energy feedback of current energy feedback type secondary cell detecting system
Mode there is certain risk, it is necessary to which further improve.
The content of the invention
In view of deficiency of the prior art, the present invention is proposed, by way of interior power network and buffer module are set, it is to avoid
Electric energy directly feeds into security risk caused by national grid.
In one aspect of the invention there is provided a kind of secondary cell detecting system, including：Interior power network, electric energy buffering mould
Block, master controller, and the detected unit comprising secondary cell, the electric energy buffer module be connected to the master controller,
The interior power network and an external electrical network, the detected unit need to carry out charging and at least one at least one times in detection process
Secondary electric discharge, it obtains electric energy in charging from the interior power network, and electric energy is input into the interior power network in electric discharge, in charging and
Detected unit is allowed to be shelved during electric discharge conversion, the master controller is configured to, based on the current threshold on the interior power network
Value, it is determined that allowing the maximum number for carrying out the detected unit of charging work, i.e. maximum charge number, and allow to be discharged
The maximum number of the detected unit of work, i.e., maximum electric discharge number；The detected unit for starting maximum charge number is filled
Electricity, starts the maximum detected unit of discharge count purpose and is discharged；And it is less than energy threshold in the energy value of the detecting system
In the case of, increase the detected number of unit of charging so that detecting system supplements energy from the external electrical network.
There is provided a kind of method for controlling secondary cell detecting system, the detecting system bag according to a further aspect of the invention
Interior power network, electric energy buffer module, and the detected unit comprising secondary cell are included, the electric energy buffer module is connected to described
Interior power network and an external electrical network, the detected unit need to carry out charging at least one times in detection process and put at least one times
Electricity, it obtains electric energy from the interior power network in charging, electric energy is input into the interior power network in electric discharge, is being charged and discharged
Detected unit is allowed to be shelved during conversion, methods described includes：Based on the current threshold on the interior power network, it is determined that allowing
The maximum number of the detected unit of charging work, i.e. maximum charge number are carried out, and allows to carry out the tested of electric discharge work
The maximum number of unit is surveyed, i.e., maximum electric discharge number；The detected unit for starting maximum charge number is charged, and is started maximum
Discharge count purpose is detected unit and discharged；In the case where the energy value of the detecting system is less than energy threshold, increase
The detected number of unit of charging so that detecting system supplements energy from the external electrical network.
According to one embodiment, methods described also includes, the number of the test position included based on the detecting system, with
And the charging current of the detected unit, the current threshold on the interior power network is set.
According to one embodiment, determine that maximum charge number includes, based on the current threshold, and single detected list
The charging current of member, determines the maximum charge number；It is determined that maximum electric discharge number includes, based on the current threshold, with
And the discharge current of single detected unit, determine maximum electric discharge number.
According to one embodiment, methods described also includes, and adjusts the maximum charge number and/or maximum electric discharge number,
So that total charging current is more than total discharge current, and the two try one's best it is close.
In one embodiment, adjusting the maximum charge number and/or maximum electric discharge number includes, and determines the maximum
Total charging current corresponding to the number that charges, and total discharge current corresponding to the maximum electric discharge number；Compare described total
Charging current and total discharge current；In the case where total discharge current is more than the charging current, reduce institute one by one
Maximum electric discharge number is stated, until resulting new total discharge current is less than total charging current；In total charging current
In the case of more than total discharge current, reduce the maximum charge number one by one, until obtained new total charging current
It is less than the charging current of single detected unit with the difference of total discharge current.
According to one embodiment, starting the detected unit progress charging of maximum charge number includes, and preferential startup is complete
Charged into electric discharge, the detected unit in the state of shelving, start the maximum detected unit of discharge count purpose and discharged
Including, it is preferential start completed to charge, the detected unit in the state of shelving is discharged.
According to one embodiment, methods described also includes, and the primary power value based on the detecting system determines the energy
Measure threshold value.
In one embodiment, the detected number of unit of increase charging includes, and increases the detected unit of charging one by one
Number, until the energy value of detecting system is not less than the energy threshold.
According to one embodiment, methods described also includes, once the energy value of detecting system reaches primary power value, will fill
The number of the detected unit of electricity is recovered to original value.
Using detecting system proposed by the present invention and control method, it is possible to prevente effectively from being made in the prior art to national grid
Into security risk, and reduce to the capacity requirement of electric energy buffer module.
Brief description of the drawings
Fig. 1 shows the structural representation of secondary cell detecting system according to embodiments of the present invention；
Fig. 2 shows the flow chart of the method for the control secondary cell detecting system according to one embodiment；
Fig. 3 shows the execution flow of set-up procedure in one embodiment；And
Fig. 4 shows execution flow in one embodiment for detection supplement energy.
Embodiment
Below by drawings and examples, the technical scheme to the embodiment of the present invention is described in further detail.
Fig. 1 shows the structural representation of secondary cell detecting system according to embodiments of the present invention.As shown in figure 1, at this
In the embodiment of invention, secondary cell detecting system includes：Interior power network 11, detected unit 12, electric energy comprising secondary cell
Buffer module 13 and master controller 14.
It is detected unit 12 and is connected to interior power network 11 and master controller 14, secondary electricity is carried out under the control of the master controller
The charging and discharging detection in pond.Specifically, be detected unit needed in detection process carry out at least one times charging and at least one times
Electric discharge, it obtains electric energy from the interior power network in charging, electric energy is input into the interior power network in electric discharge, is charging and is putting
Allow to be shelved during electricity conversion.
Electric energy buffer module 13 is connected to interior power network 11 and master controller 14, is additionally coupled to an external electrical network 15.
Master controller 14 is configured to, and control electric energy buffer module 13 balances the electric energy on interior power network 11.It is, once examining
When the electric energy for measuring the inside input of power network 11 of detected unit is more than the electric energy that interior power network 11 needs are obtained, control the electric energy slow
Die block 13 stores unnecessary electric energy；Once detect the electric energy of the inside input of power network 11 of detected unit 12 needs less than interior power network
During the electric energy to be obtained, the inside power network 11 of the electric energy buffer module 13 is controlled to supplement the electric energy lacked.
The embodiment of above-mentioned all parts is described separately below.
As it was previously stated, in the energy feedback type secondary cell detecting system of prior art, secondary cell is connected directly to
Outside national grid, thus there is the risk that a large amount of distortion currents are inputted to national grid.And as shown in figure 1, in the present invention
Embodiment in, in order to avoid such risk, provide in the detection system in power network, carry out " reception " battery discharging energy.Such as
This, discharge current will not be directly inputted into national grid.
In one embodiment, interior power network is the internal electric network for detecting enterprise, and it is different from the national grid of outside.It is outside
National grid electric energy can be externally provided, and the effect of interior power network is transmitted between detected unit and electric energy buffer module
Energy, interior power network neither produces energy nor consumed energy in itself.According to one embodiment, interior power network is direct current network.
Because there is provided interior power network, in an embodiment of the present invention, the detected unit 12 comprising secondary cell is in connection
After being started working to detecting system, there can't be any direct interaction with outside national grid, but be connected to interior power network
11 and master controller 14, the detection charged and discharged under the control of the master controller.Specifically, discharged in secondary cell
When, electric energy is input into interior power network 11, when secondary cell charges, and electric energy is obtained from interior power network 11.
In charging/discharging of secondary cell detection process, it is desirable to be detected unit 12 and charged at least one times and at least one times
Electric discharge.In fact, majority has secondary cell to be detected when dispatching from the factory in half-full state, to such secondary cell,
It is required that during detection process completion, it is similarly in half-full state.In one embodiment, in detection process, it is detected single
Member first can charge to full up from half-full, be then discharged to half-full, or can first be discharged to full sky, then charge to it is half-full,
So as to complete detection.In another embodiment, unit 12 is detected repeatedly to be charged and multiple discharge in detection process.Example
Such as, typically, the detected unit comprising lithium ion battery often works in first mode of operation of " filling-putting-to fill ", or
Second mode of operation of " putting-filling-to put ", wherein in the first operation mode, detected unit charges to full up, Ran Houfang first
Empty electric energy, finally charge to again it is half-full so that complete one detection the work period；And in the second operation mode, be detected
Unit is then vented electric energy first, then charges to full up, finally discharges into half-full.Other kinds of secondary cell is possible to work
In more different mode of operations, increasingly complex detection process is undergone.But, which kind of mode of operation no matter is worked in, is carried out
How many times discharge and recharge, discusses herein for such situation：In the conversion charged, discharged, it is allowed to be detected single
Member is shelved, and during charge or discharge, is not then allowed to be detected unit pause or shelved.
In one embodiment, being detected unit 12 also includes (not shown) on-off control circuit and parameter acquisition circuit,
Wherein on-off control circuit is used for the circuit on-off for controlling secondary cell to be charged and discharged, and parameter acquisition circuit is used to gather secondary
Parameter during battery charging and discharging.
In one embodiment, the voltage of interior power network is higher than the voltage for being detected secondary cell in unit 12.At this moment, it is necessary to
Voltage reduction module and respective load are connected between detected unit and interior power network.With reference to Fig. 1, in one embodiment, it is detected
Unit 12 is connected to interior power network 11 when secondary cell charges via unit voltage reduction module 16, and the unit voltage reduction module 16 will be interior
The voltage that the voltage of power network is down to needed for the secondary cell in detected unit；Also, unit 12 is detected to put in secondary cell
Interior power network 11 is connected to via the first load blocks 17 when electric, the electric energy that first load blocks 17 discharge secondary cell is whole
Interior power network 11 is fed to after stream.Embodiments in accordance with the present invention, above-mentioned first load blocks 17 are energy feedback type electronic loads
Module, can carry out rectification to electric current, then be fed to interior power network.
In Fig. 1, multiple detected units 12 are connected to the interior power network in detecting system.In fact, being detected unit
Number and working condition can be controlled and set as needed, this will be explained hereinafter.
As it was previously stated, interior power network does not produce energy or consumed energy in itself, and simultaneously, multiple detected units 12 are all
Interior power network is connected to charged and/or discharged, accordingly, it would be desirable to electric energy buffer module 13 maintains the energy balance of interior power network,
It is, when net energy inflow is produced on interior power network, unnecessary energy is stored, and there is net energy stream on interior power network
When going out, the energy that this part lacks is supplemented.Correspondingly, as shown in figure 1, electric energy buffer module 13 is connected to interior power network 11 and master control
Device 14 processed, so that under the control of master controller 14, the electric energy of power network in balance.In addition, electric energy buffer module 13 is also connected with
To external electrical network 15, so that when being necessary, electric energy is obtained from external electrical network 15.The external electrical network 15 can be the state of standard
Family's power network or detection enterprise external, other offer electric energy power network.
The need for for balance electric energy, a critical function of electric energy buffer module 13 is exactly the storage and release of electric energy.
Therefore, in one embodiment, electric energy buffer module 13 includes battery, for storing electric energy and release electric energy.Battery
Capacity is determined according to the battery capacity and number of unit 12 is detected.
In addition, electric energy buffer module 13 can also include charging control circuit (not shown), for controlling battery from interior
Power network 11 or the circuit on-off that electric energy is obtained from external electrical network 15.Electric energy buffer module 13 can also include charge/discharge control circuit
(not shown), for controlling the inside power network 11 of battery to discharge the circuit on-off of electric energy.Again, it can be seen that for safety
Consider, whole detecting system only obtains electric energy from external electrical network 15, without conveying electric energy to it.In addition, electric energy buffers mould
Block 13 also includes buffer parameter Acquisition Circuit, for gathering the parameter in battery stores electricity energy and release power process.
As shown in figure 1, in one embodiment, electric energy buffer module 13 passes through the first voltage reduction module 18-1 and second respectively
Voltage reduction module 18-2 is connected to interior power network 11 and external electrical network 15, wherein the first voltage reduction module 18-1 is by the voltage drop of interior power network 11
The voltage needed for battery into electric energy buffer module, and the voltage of external electrical network 15 is down to storage by the second voltage reduction module 18-2
Voltage needed for battery.It is appreciated that usually, the voltage of external electrical network 15 is unified setting and provided, and interior power network 11
Voltage can then be set according to the need for detecting system.Therefore, the voltage of interior power network 11 and the voltage of external electrical network 15
Can be with identical, can also be different.Correspondingly, the first voltage reduction module 18-1 and the second voltage reduction module 18-2 decompression performance can phases
Together, can also be different.
In addition, electric energy buffer module 13 is also connected to interior power network 11, the second load mould by the second load blocks 19
Block 19 will be fed to the interior power network after the electric energy rectification of the battery release in electric energy buffer module.According to the implementation of the present invention
Example, above-mentioned second load blocks 19 can be energy feedback type electronic load module, and rectification is carried out to electric current, then be fed to interior
Power network.
As it was previously stated, electric energy buffer module 13 is under the control of master controller 14, the electric energy in balance on power network, also
It is that when producing net energy on interior power network to flow into, unnecessary energy is stored, and has net energy outflow on interior power network
When, supplement the energy that this part lacks.And in detection process, detected unit may be at the work shape of charge or discharge
State.In extreme circumstances, if all detected units are simultaneously in discharge condition, that is accomplished by electric energy buffer module 13 and absorbed
And the electric energy of all releases is stored, this undoubtedly proposes high requirement to the scale of electric energy buffer module.Therefore, it is intended that main control
Device 14 was controlled and designed to the number and working condition for being detected unit in the detection incipient stage, slow to electric energy to reduce
The pressure of die block.
Therefore, master controller 14 is configured to, in the detection incipient stage, it is determined that start the detected unit of work number and
Its working condition so that the charging or discharging current on interior power network reaches balance as far as possible, that is, net energy inflow/outflow is as far as possible
It is few, in detection process, the electric energy of detecting system is supplemented when necessary.Specifically, it is main under one embodiment of the present invention
Controller 14 is primarily based on the current threshold on interior power network, it is determined that allowing the maximum number for carrying out the detected unit of charging work
Mesh, i.e. maximum charge number, and allow the maximum number of the detected unit of progress electric discharge work, i.e., maximum electric discharge number；
Then the detected unit for starting above-mentioned maximum charge number is charged, and is started maximum discharge count purpose and is detected unit progress
Electric discharge；In detection process, in the case where the energy value of detecting system is less than energy threshold, increase the detected unit of charging
Number so that detecting system supplements energy from external electrical network.
The method that master controller is controlled to detecting system is detailed below.
Fig. 2 shows the flow chart of the method for the control secondary cell detecting system according to one embodiment, wherein described two
Primary cell detecting system is detecting system as described above, as shown in Figure 1.
As shown in Fig. 2 according to the method for the embodiment, in step 21, based on the current threshold on interior power network, it is determined that allowing
The maximum number of the detected unit of charging work, i.e. maximum charge number are carried out, and allows to carry out the tested of electric discharge work
The maximum number of unit is surveyed, i.e., maximum electric discharge number；In step 23, the detected unit for starting maximum charge number is filled
Electricity, starts the maximum detected unit of discharge count purpose and is discharged；In step 25, it is less than energy cut-off in the energy value of detecting system
In the case of value, increase the detected number of unit of charging so that detecting system supplements energy from external electrical network.
The specific executive mode of each step is described below.
In one embodiment, before step 21 is performed, step 20 is first carried out, wherein, sets on interior power network
Current threshold.In one embodiment, step 20 as the inventive method preliminary step, it is pre- before the inventive method is performed
First carry out；Or, in one embodiment, step 20 is performed at scene when performing the inventive method.Correspondingly, in fig. 2, walk
Rapid 20 are shown with dotted line frame.
In one embodiment, in step 20, the number of the test position included based on detecting system, and be detected single
The charging current of member, sets the current threshold on interior power network.In a specific example, the current threshold is set as,
The half of total current value all detected units charge simultaneously when.Specifically, it is assumed that detecting system has m test position,
It is, can connect m detected units simultaneously carries out detection work, also, the charging current of each detected unit is
I, then above-mentioned current threshold T can be set to mI/2.So, just can guarantee that detecting system is not in all detected lists
The situation of member work simultaneously.In a further embodiment, current threshold can be set lower, that is, less than mI/2,
So as in follow-up, the number of the detected unit of limitation startup work.
Current threshold on interior power network based on above-mentioned determination, in step 21, it is determined that allowing to carry out the tested of charging work
Survey unit maximum number, i.e. maximum charge number Cn, and allow carry out electric discharge work detected unit maximum number,
I.e. maximum electric discharge number Dn.In fact, maximum charge number Cn is it is, so that total charging current reaches maximum and is no more than
Current threshold T detected number of unit, maximum electric discharge number Dc are it is, so that total discharge current reaches maximum and do not surpassed
Overcurrent threshold value T detected number of unit.
In order to determine maximum charge number Cn and maximum electric discharge number Dn, filling for single detected unit is correspondingly considered
Electric current Ic and discharge current Id.Specifically, step 21 includes, based on above-mentioned current threshold T, and single detected unit fills
Electric current Ic, determines maximum charge number Cn；Based on above-mentioned current threshold T, and single detected unit discharge current Id,
Determine maximum electric discharge number Dn.Usually, maximum charge number and maximum discharge count purpose are being determined simultaneously, can be corresponding
Determine corresponding total charging current CI and total discharge current DI in ground.For example, in the example of a lithium ion battery, it is assumed that
Current threshold T=88A on interior power network, the charging current Ic of single detection unit are 3A, and discharge current Id is 10A, then can be with
Determine, maximum charge number Cn is 29, corresponding total charging current CI is 3A*29=87A；And maximum electric discharge number Dn is 8,
Corresponding total discharge current DI is 10A*8=80A.
On the basis of maximum charge number Cn and maximum electric discharge number Dn is determined, in one embodiment, in step
23, maximum charge number and maximum discharge count purpose are detected unit starting and charge and discharge work respectively.In this way, can
So that detected unit starting detection work as much as possible, farthest utilizes detecting system.
It is right before step 23 however, in one embodiment, it is considered to total charging current and the difference of total discharge current
Above-mentioned maximum charge number and maximum electric discharge number are adjusted.It is, before step 23, performing step 22, wherein
Adjust the maximum charge number and/or maximum electric discharge number so that total charging current is more than total discharge current, and the two is tried one's best
It is close.
The execution of step 22 is based primarily upon considered below.For most secondary cells, its charging current and discharge current are simultaneously
Unequal, thus obtained total charging current and total discharge current are often also unequal.It is more than total charging in total discharge current value
In the case of current value, enter detection process if directly starting according to result of calculation and being detected unit, in detecting system fortune
In row, the energy of the battery release in discharge condition is persistently higher than the energy that the battery in charging process absorbs, unnecessary
Energy continuously can be delivered to electric energy buffer module by interior power network, and the time is slightly long, it is possible to cause electric energy to buffer mould
Block off-capacity, electric energy overflows.Accordingly, it would be desirable to be adjusted to charge-discharge battery quantity.
In fact, for using lithium ion battery, as the typical secondary battery of representative, the charging current of single battery is small
In discharge current.Now, bigger probability occurs that total charging current is more than the situation of total discharge current.Because charging current
Smaller, the total charging current generally obtained is easier access to current threshold.For example, in previous example, single detection unit
Charging current is 3A, and discharge current is 10A, then corresponding total charging current is 87A, and total discharge current is 80A, total charging current
Closer to current threshold, hence it is evident that more than total discharge current.Although will not now cause the electric energy of electric energy buffer module to overflow,
It is, when charging current is excessive more than discharge current, it is possible to there is the system failure, to be described below.
If charging current is more than discharge current on interior power network, i.e., the energy that the battery in charged state absorbs continues height
In in discharge condition battery release energy, then this energy missing can be entered by external electrical network via electric energy buffer module
Row supplement.It follows that in detecting system operation, external electrical network can inject electric energy to detecting system in real time.On the other hand, such as
Shown in Fig. 1, multiple voltage reduction modules and load blocks are included in detecting system, these modules can all produce energy loss.If outer
The real time energy value that portion's power network is provided is higher than the energy value of transformation loss in system, then total energy value meeting now in detecting system
Constantly rise, until reaching detecting system Energy maximum value, causes detecting system operation troubles.When the electric discharge electricity for being detected unit
When flowing larger, the charging current drawn according to method before is more commonly greater than discharge current, is now possible to outside occur
The energy value that power network is provided is higher than the situation of energy loss, so as to some system failures occur.Therefore, it is also desirable to discharge and recharge
The number for being detected unit is adjusted.
Therefore, in one embodiment, set-up procedure 22 is with the addition of before step 23, maximum charge number is adjusted wherein
Mesh and/or maximum electric discharge number so that total charging current is more than total discharge current, and the two try one's best it is close.Fig. 3 is shown at one
The flow of set-up procedure in embodiment, that is, step 22 sub-step.
As shown in figure 3, total charging current CI corresponding to above-mentioned maximum charge number Cn is determined in step 221 first, with
And total discharge current DI corresponding to maximum electric discharge number Dn.It is appreciated that total charging current CI can be easily based on maximum
Charging number Cn and single detected unit charging current Ic and determine, i.e. CI=Cn*Ic, similarly, total discharge current DI
=Dn*Id.
Then, in step 222, relatively more above-mentioned total charging current CI and total discharge current DI.
If total discharge current DI is more than total charging current CI, then in step 223 so that maximum electric discharge number Dn subtracts 1,
It is then return to step 222 to continue to judge, if the total discharge current now updated reduces again still greater than total charging current CI
Maximum electric discharge number Dn.That is, in the case where DI is more than CI, reducing maximum electric discharge number Dn one by one, until resulting
New total discharge current DI be less than total charging current CI, so as to complete the adjustment to maximum electric discharge number Dn.For with lithium from
For sub- battery is the typical secondary battery of representative, the discharge current Id of single battery is more than charging current Ic.Even if occurring total
Discharge current is more than the situation of total charging current, generally subtracts 1 by maximum electric discharge number Dn, it is possible to which satisfaction require that.In majority
In the case of, after adjustment Dn, return to judgment step 222, it may appear that total charging current CI is more than total discharge current DI situation,
It is now then following to adjust Cn.
Step 222 judged result be total charging current CI be more than total discharge current DI in the case of, in step 224,
Continue to judge corresponding total charging current and total discharge current DI difference whether less than single detected unit charging current
Ic, if it is, adjustment is in place, if it is not, proceeding to step 225 so that maximum charge number Cn subtracts 1, then, again
Step 224 is returned to be judged.If total charging current and the difference of total discharge current now reduces again still above Ic
Maximum charge number Cn, until current differential is less than Ic, adjustment terminates.That is, being more than total electric discharge in total charging current CI
In the case of electric current DI, reduce maximum charge number Cn one by one, until resulting new total charging current and former total electric discharge electricity
The difference of stream is less than the charging current of single detected unit.
For example, in the example of foregoing lithium ion battery, the charging current Ic of single detection unit is 3A, discharge current Id
For 10A, maximum charge number Cn is 29, and corresponding total charging current CI is 87A；Maximum electric discharge number Dn is 8, corresponding always to put
Electric current DI is 80A.This belongs to more typical situation.In this case, it is clear that total charging current CI is more than total discharge current
DI.So, just maximum charge number Cn is subtracted 1, now corresponding total charging current is correspondingly reduced to 84A.But now, newly
Total charging current (84A) and total discharge current (80A) charging current Ic of the difference still above single detected unit
(3A), so, continue to reduce maximum charge number Cn, correspondingly, resulting total charging current is updated to 81A.Now, update
The difference of total charging current (81A) and total discharge current (80A) be less than the charging current Ic (3A) of single detected unit, adjust
It is whole to terminate.
It can be seen that, it is finally giving as a result, total charging current is more than total electric discharge after being adjusted by discharge and recharge number
Electric current, and the two as close as.After actually adjusting, total charging current and the difference of total discharge current are not more than single
It is detected the charging current of unit.By being simulated with reference to specific detecting system (for example, assuming that in the detection system, being depressured mould
The energy loss of block and load blocks is about 2%) it was determined that in the case of after the adjustment, will not produce total charging current big
In the situation that discharge current is excessive, the energy that the real-time power that external electrical network is provided would not also be lost more than transformation in system,
Continue elevated situation so as to occur system capacity.
By the adjustment of step 22, maximum charge number Cn and/or maximum electric discharge number Dn have updated.Correspondingly, in step
Rapid 23, the detected unit starting of the maximum charge number of renewal is charged, the maximum discharge count purpose of renewal is detected
Unit starting is surveyed to be discharged.
In one embodiment, starting the detected unit progress charging of maximum charge number in step 23 includes, preferentially
Startup has been completed to discharge, the detected unit in the state of shelving is charged, and starts the maximum detected unit of discharge count purpose
Carrying out electric discharge includes, it is preferential start completed to charge, the detected unit in the state of shelving is discharged.It is, preferential
Start and come into detection process and the detected unit in state of shelving continues it and detects work, rather than deliver newly
Detected unit is operated, and can so cause the detected unit for coming into detection process to complete its detection as early as possible.
It is operated starting detected unit accordingly according to above-mentioned maximum charge number and maximum electric discharge number
Afterwards, in detecting system running, the energy that the real-time power that external electrical network is provided always is lost less than transformation in system, this
Result in the state that detecting system is in the continuous reduction of energy.If this process duration is long, detecting system can be caused
Internal energy is too low, and then causes system operation failure.Therefore, in detection process, in addition it is also necessary to monitor the energy of detecting system
Change, supplements energy when necessary.It is, performing step 25, it is less than the situation of energy threshold in the energy value of detecting system
Under, increase the detected number of unit of charging so that detecting system supplements energy from external electrical network.
It is appreciated that in one embodiment, before step 25, can also carry out the step for setting above-mentioned energy threshold
Suddenly.Similar with step 20, the step can in advance be first carried out before the method and step of the present invention is performed, and can also perform this hair
Scene is performed during bright method and step.
In one embodiment, primary power value of the above-mentioned energy threshold based on detecting system and set.For example, at one
In example, initially, each detected unit is all in half-full state.Can the energy based on the detected unit of half-full state
The number of value and the detected unit of startup work, determines the primary power value of detecting system, will be less than the initial energy
Some value of value is set to energy threshold.For example, can be set as energy threshold, primary power value subtracts one and is detected
The rated energy value of unit.It is of course also possible to which energy threshold is set into other values as needed.It is appreciated that the energy cut-off
It is worth for the standard as detecting system energy variation, once less than the energy threshold, it is considered as, detecting system energy is too low,
Require supplementation with.
Fig. 4 be shown as detecting system supplement energy step flow chart, that is, step 25 sub-step.
As shown in figure 4, judging whether the current energy value of detecting system is less than energy threshold in step 251 first.If
Less than the energy threshold, then advance to step 252, the number of the detected unit of charging is increased by 1, then in step
253, it is determined that the now renewal energy value of detecting system.It is appreciated that once increasing the detected unit of charging, it will increase outer
The electric energy that portion's power network injects to detecting system, so as to increase the energy value of detecting system.Then, step 251 is returned to, continues to sentence
Whether the current energy value of disconnected detecting system is less than energy threshold.That is, increase the detected number of unit of charging one by one,
Until the energy value of detecting system is not less than the energy threshold.
Further, in one embodiment, in the detected unit of increase charging, and then detecting system energy value is increased
Afterwards, determine whether, whether the current energy value of detecting system is less than the primary power value of system.Once current energy value is extensive
It is energy initial value again, even more than primary power value then stops energy supplement process., can be with after energy supplement process stops
The number of the detected unit of charging is reverted into original value.But, due to not allowing pressure to interrupt tested in charge and discharge process
Unit is surveyed, be therefore, it can after this charging process is completed, charging number is recovered.
Thus, by method sequence described above, the detected work of unit in the detection system has been carried out multistage
The comprehensive control of section.It is, in the detection incipient stage, within the basis of electric current on power network, design and control to be filled
The number and the number of the detected unit discharged of the detected unit of electricity, and above-mentioned number is adjusted when necessary, with
So that electric current is balanced as far as possible.In detection process, the energy variation of detecting system is monitored, its energy is supplemented when necessary, is made
Obtain detecting system and carry out detection work steadily in the long term.
It is appreciated that what the above method was performed by the master controller in detecting system.
Professional should further appreciate that, each example described with reference to the embodiments described herein
Unit and step, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes the composition and step of each example according to function in the above description.These
Function is performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
The method that is described with reference to the embodiments described herein can use hardware, computing device the step of algorithm
Software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only storage
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (10)
1. a kind of secondary cell detecting system, including：Interior power network, electric energy buffer module, master controller, and include secondary cell
Detected unit, the electric energy buffer module is connected to the master controller, the interior power network and an external electrical network, described
Being detected unit needs to carry out charging at least one times in detection process and discharges at least one times, and it is in charging from the interior power network
Electric energy is obtained, electric energy is input to the interior power network in electric discharge, allows detected unit to carry out when being charged and discharged conversion
Shelve, it is characterised in that the master controller is configured to, based on the current threshold on the interior power network, it is determined that allowing to be filled
The maximum number of the detected unit of electricity work, i.e. maximum charge number, and allow the detected unit of progress electric discharge work
Maximum number, i.e., maximum electric discharge number；The detected unit for starting maximum charge number is charged, and starts maximum discharge count
Purpose is detected unit and discharged；And in the case where the energy value of the detecting system is less than energy threshold, increase charging
Detected number of unit so that detecting system from the external electrical network supplement energy.
2. a kind of method for controlling secondary cell detecting system, the detecting system includes interior power network, electric energy buffer module, and
Detected unit comprising secondary cell, the electric energy buffer module is connected to the interior power network and an external electrical network, described
Being detected unit needs to carry out charging at least one times in detection process and discharges at least one times, and it is in charging from the interior power network
Electric energy is obtained, electric energy is input to the interior power network in electric discharge, allows detected unit to carry out when being charged and discharged conversion
Shelve, it is characterised in that methods described includes：
Based on the current threshold on the interior power network, it is determined that allowing the maximum number for carrying out the detected unit of charging work, i.e.,
Maximum charge number, and allow the maximum number of the detected unit of progress electric discharge work, i.e., maximum electric discharge number；
The detected unit for starting maximum charge number is charged, and is started the maximum detected unit of discharge count purpose and is put
Electricity；
In the case where the energy value of the detecting system is less than energy threshold, increase the detected number of unit of charging so that
Detecting system supplements energy from the external electrical network.
3. method according to claim 2, in addition to, the number of the test position included based on the detecting system, with
And the charging current of the detected unit, the current threshold on the interior power network is set.
4. method according to claim 2, wherein it is determined that maximum charge number includes, based on the current threshold, and
The charging current of single detected unit, determines the maximum charge number；
It is determined that maximum electric discharge number includes, based on the discharge current of the current threshold, and single detected unit, determine
Maximum electric discharge number.
5. method according to claim 2, in addition to, the maximum charge number and/or maximum electric discharge number are adjusted, is made
Total charging current be more than total discharge current, and the two try one's best it is close.
6. method according to claim 5, wherein adjusting the maximum charge number and/or maximum electric discharge number includes,
Determine total charging current corresponding to the maximum charge number, and total electric discharge corresponding to the maximum electric discharge number
Electric current；
Compare total charging current and total discharge current；
In the case where total discharge current is more than the charging current, reduce the maximum electric discharge number, Zhi Daosuo one by one
Obtained new total discharge current is less than total charging current；
In the case where total charging current is more than total discharge current, reduce the maximum charge number one by one, until
Obtained new total charging current and the difference of total discharge current are less than the charging current of single detected unit.
7. method according to claim 2, includes wherein the detected unit for starting maximum charge number carries out charging, excellent
First start completed to discharge, the detected unit in the state of shelving is charged, start maximum discharge count purpose be detected it is single
Member, which carries out electric discharge, to be included, it is preferential start completed to charge, the detected unit in the state of shelving is discharged.
8. method according to claim 2, in addition to, the primary power value based on the detecting system determines the energy
Threshold value.
9. method according to claim 2, wherein increasing the detected number of unit of charging includes, increase one by one is charged
Number of unit is detected, until the energy value of detecting system is not less than the energy threshold.
10. method according to claim 2, in addition to, once the energy value of detecting system reaches primary power value, it will fill
The number of the detected unit of electricity is recovered to original value.
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