CN104600383B

CN104600383B - Battery pack electric quantity equalization method and apparatus thereof

Info

Publication number: CN104600383B
Application number: CN201310529144.1A
Authority: CN
Inventors: 王少鹏; 张君鸿
Original assignee: Beiqi Foton Motor Co Ltd
Current assignee: Beijing Treasure Car Co Ltd
Priority date: 2013-10-30
Filing date: 2013-10-30
Publication date: 2017-02-08
Anticipated expiration: 2033-10-30
Also published as: CN104600383A

Abstract

The invention provides a battery pack electric quantity equalization method and an apparatus thereof. The method includes the following steps: acquiring the electric quantity of each of single batteries in a battery pack and the standing time of the battery pack after the battery pack is electrified; judging whether the standing time of the battery pack is longer than a preset time threshold or not; generating an electric quantity difference of the electrification this time according to the electric quantity of each of the single batteries in the electrified battery pack if the standing time is longer than the threshold; further judging whether the electric quantity difference this time is larger than an electric quantity last time or not; generating an equalization threshold according to the electric quantity difference of the electrification this time if the electric quantity difference this time is larger than the electric quantity difference last time; and carrying out electric quantity equalization on each of the single batteries in the battery pack according to the equalization threshold. The method in the embodiment of the invention allows the equalization threshold to be corrected in real time in order to reduce the electric quantity equalization frequency of the battery pack, so the charge and discharge efficiency of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

The electric quantity balancing method and apparatus of set of cells

Technical field

The present invention relates to cell art, the electric quantity balancing method and apparatus of more particularly, to a kind of set of cells.

Background technology

At present, the set of cells of electric automobile is in series by cell mostly, due to cell in the fabrication process And difference can be produced during the cycle charge-discharge of set of cells, result in each cell in rated capacity, voltage, interior The aspects such as resistance are not quite identical.Therefore this makes the little cell of rated capacity can be first filled with when charging, if continued Charging then to lead to it to overcharge；Conversely, the little cell of rated capacity can discharge first in electric discharge, it is continuing with, can lead Cause it to cross to put.Thus have impact on the normal use of set of cells, also reducing the service life of set of cells, even resulting in set of cells not Can normal work.For this reason, this problem can be solved by electric quantity balancing technology, the purpose of electric quantity balancing is to make each cell SOC（State Of Charge, state-of-charge）Unanimously.

At present, in terms of two, mainly study electric quantity balancing technology：One is research electric quantity balancing control method, mainly builds The Conformance Assessment system of each cell in vertical set of cells, and determine effective electric quantity balancing strategy on this basis；Two It is the hardware implementation mode that research electric quantity balancing controls, the mainly design of equalizing circuit, the topographical form of equalizing circuit Can be largely classified into two classes：Energy-dissipating equilibrium and energy non-dissipative type equilibrium.Wherein, energy-dissipating equilibrium refers to consume The energy of the too high battery of monomer battery voltage carrys out the capacity difference between each monomer in balancing battery group；Energy non-dissipative type equalizes Refer to energy to be transmitted between each cell in set of cells or shift.At present, based on SOC as decision condition energy The electric quantity balancing method of amount nondissipative equalization, typically only considers that the SOC of the set of cells that the SOC of cell is located with it is average The difference of value, opens equalizing circuit when difference reaches equilibrium threshold value.At the use initial stage of set of cells, usual cell Concordance is preferable, so almost there is no defect, but being continuously increased with set of cells use time, will there is problems with： SOC gap between cell increases so that the SOC of worst cell and the average value difference of the SOC of set of cells in set of cells Away from easily reaching equilibrium threshold value, thus continually opening equalizing circuit.Due to equalizing circuit itself also can consumed energy, plus In transmitting procedure consume energy, thus greatly reducing the efficiency of the discharge and recharge of set of cells.

Content of the invention

It is contemplated that at least solving one of above-mentioned technical problem.

For this reason, the first of the present invention purpose is to propose a kind of electric quantity balancing method of set of cells.The method can be real When ground correction equilibrium threshold value, thus decreasing the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells.

Second object of the present invention is to propose a kind of electric quantity balancing device of set of cells.

To achieve these goals, the electric quantity balancing method of the set of cells of first aspect present invention embodiment, including following Step：On the battery pack after electricity, obtain in described set of cells the electricity of each cell and obtain the quiet of described set of cells Put the time；Judge whether the time of repose of described set of cells is more than preset time threshold；If it is determined that being more than described Preset Time Threshold value, then generate electric electricity on this according to the electricity of described each cell of set of cells after electricity on this poor；Further Judge whether the electricity difference of this upper electricity described is poor more than previous electric electricity；Electricity if greater than described previous upper electricity Difference, then generate according to the electricity difference of this upper electricity described and equalize threshold value；And according to described equilibrium threshold value to described battery In group, each cell carries out electric quantity balancing.

The electric quantity balancing method of the set of cells of the embodiment of the present invention, by being corrected in real time to equilibrium threshold value, from And decrease the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells, extend the use longevity of set of cells Life.

In one embodiment of the invention, the electric quantity balancing method of described set of cells also includes：If it is determined that being not more than Described preset time threshold, then generate described equilibrium threshold value according to the electricity difference of described previous upper electricity.

In one embodiment of the invention, the electric quantity balancing method of described set of cells also includes：If it is determined that described The electricity that the electricity difference of secondary upper electricity is not more than previous upper electricity is poor, then generate described counterbalanced gate according to the electricity difference of described previous upper electricity Limit value.

The electric quantity balancing method of the set of cells of the embodiment of the present invention, is not more than Preset Time threshold in the time of repose of set of cells When the electricity difference of electricity is not more than the electricity difference of previous upper electricity during value or on this, the electricity difference from previous upper electricity generates equilibrium Threshold value, makes the equilibrium threshold value of generation more accurate, further reduces the electric quantity balancing number of times of set of cells, improve further The efficiency of the discharge and recharge of set of cells.

In one embodiment of the invention, the electric quantity balancing method of described set of cells also includes：Electricity under set of cells Afterwards, obtain in described set of cells the electricity of each cell and obtain the overall electricity of described set of cells；Judge described battery Whether the overall electricity of group is less than default power threshold；If it is determined that being less than described default power threshold, then according to this lower electricity Afterwards the electricity of described each cell of set of cells generate this lower electricity electricity poor；Determine whether the electricity of this lower electricity described Whether amount difference is poor more than the electricity of previous lower electricity；Electricity if greater than described previous lower electricity is poor, then according to this lower electricity described Electricity difference generate described equilibrium threshold value；And according to described equilibrium threshold value, each cell in described set of cells is entered Row electric quantity balancing.

In one embodiment of the invention, the electric quantity balancing method of described set of cells also includes：If it is determined that being not less than Described default power threshold, then generate described equilibrium threshold value according to the electricity difference of described previous lower electricity.

In one embodiment of the invention, the electric quantity balancing method of described set of cells also includes：If it is determined that described The electricity that the electricity difference of secondary lower electricity is not more than previous lower electricity is poor, then generate described counterbalanced gate according to the electricity difference of described previous lower electricity Limit value.

After electricity under set of cells, equilibrium threshold value is corrected in real time, further improve equilibrium threshold value Accuracy, thus decreasing the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells, extending set of cells Service life.

To achieve these goals, the electric quantity balancing device of the set of cells of second aspect present invention embodiment, including：Upper electricity Acquisition module, after electricity on the battery pack, obtains in described set of cells the electricity of each cell and obtains described electricity The time of repose of pond group；Upper electricity judge module, whether the time of repose for judging described set of cells is more than preset time threshold； Upper power consumption difference generation module, for if it is determined that being more than described preset time threshold, then according to described battery after electricity on this Organize each cell electricity generate on this electricity electricity poor；Upper power consumption difference judge module, is used for determining whether institute Whether the electricity difference stating electricity on this is poor more than the electricity of previous upper electricity；Upper electric switch limit value generation module, for if greater than institute The electricity stating previous upper electricity is poor, then equalize threshold value according to the electricity difference generation of this upper electricity described；And upper electrical equalization module, For electric quantity balancing is carried out to each cell in described set of cells according to described equilibrium threshold value.

The electric quantity balancing device of the set of cells of the embodiment of the present invention, by upper electric switch limit value generation module to equilibrium threshold value Corrected in real time, decrease the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells, extend electricity The service life of pond group.

In one embodiment of the invention, the described upper power consumption difference in the electric quantity balancing device of described set of cells generates Module is additionally operable to：If it is determined that no more than described preset time threshold, then according to the electricity difference of described previous upper electricity generates Equilibrium threshold value.

In one embodiment of the invention, the described upper electric switch limit value in the electric quantity balancing device of described set of cells generates Module is additionally operable to：If it is determined that the electricity that the electricity difference of described electricity on this is not more than previous upper electricity is poor, then according to described previous The electricity difference of upper electricity generates described equilibrium threshold value.

The electric quantity balancing device of the set of cells of the embodiment of the present invention, is not more than Preset Time threshold in the time of repose of set of cells When the electricity difference of electricity is not more than the electricity difference of previous upper electricity during value or on this, the electricity difference from previous upper electricity generates equilibrium Threshold value, makes the equilibrium threshold value of generation more accurate, further reduces the electric quantity balancing number of times of set of cells, improve further The efficiency of the discharge and recharge of set of cells, extends the service life of set of cells.

In one embodiment of the invention, the electric quantity balancing device of described set of cells also includes：Lower electricity acquisition module, uses After electricity under set of cells, obtain the electricity of each cell in described set of cells and obtain the overall electricity of described set of cells Amount；Whether lower electricity judge module, for judging the overall electricity of described set of cells less than default power threshold；Lower power consumption bad student Become module, for if it is determined that being less than described default power threshold, then according to each monomer electricity of described set of cells after this lower electricity The electricity that the electricity in pond generates this lower electricity is poor；Lower power consumption difference judge module, for determining whether this lower electricity described Whether electricity difference is poor more than the electricity of previous lower electricity；Lower electric switch limit value generation module, for if greater than described previous lower electricity Electricity is poor, then generate described equilibrium threshold value according to the electricity difference of this lower electricity described；And lower electrical equalization module, for basis Described equilibrium threshold value carries out electric quantity balancing to each cell in described set of cells.

In one embodiment of the invention, the described lower power consumption difference in the electric quantity balancing device of described set of cells generates Module is additionally operable to：If it is determined that being not less than described default power threshold, then according to the electricity difference of described previous lower electricity generates Equilibrium threshold value.

In one embodiment of the invention, the described lower electric switch limit value in the electric quantity balancing device of described set of cells generates Module is additionally operable to：If it is determined that the electricity that the electricity difference of this lower electricity described is not more than previous lower electricity is poor, then according to described previous The electricity difference of lower electricity generates described equilibrium threshold value.

The aspect that the present invention adds and advantage will be set forth in part in the description, and partly will become from the following description Obtain substantially, or recognized by the practice of the present invention.

Brief description

The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments Substantially and easy to understand, wherein,

Fig. 1 is the flow chart of the electric quantity balancing method of set of cells according to an embodiment of the invention；

Fig. 2 is the flow chart of the electric quantity balancing method of set of cells according to an embodiment of the invention；

Fig. 3 be under set of cells according to an embodiment of the invention electricity after generate equilibrium threshold value to carry out electric quantity balancing The flow chart of method；

Fig. 4 is the structural representation of the electric quantity balancing device of set of cells according to an embodiment of the invention；

Fig. 5 is the structural representation of the electric quantity balancing device of set of cells according to an embodiment of the invention.

Specific embodiment

Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.On the contrary, originally Inventive embodiment includes falling into all changes in the range of the spirit of attached claims and intension, modification and equivalent Thing.

In describing the invention it is to be understood that term " first ", " second " etc. are only used for describing purpose, and not It is understood that as indicating or implying relative importance.In describing the invention, it should be noted that specifying unless otherwise clear and definite And restriction, term " being connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, Or be integrally connected；Can be to be mechanically connected or electrically connect；Can be to be joined directly together it is also possible to pass through intermediary It is indirectly connected to.For the ordinary skill in the art, above-mentioned term tool in the present invention can be understood with concrete condition Body implication.Additionally, in describing the invention, unless otherwise stated, " multiple " are meant that two or more.

In flow chart or here any process described otherwise above or method description are construed as, represent and include The module of the code of executable instruction of one or more steps for realizing specific logical function or process, fragment or portion Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable Sequence, including according to involved function by substantially simultaneously in the way of or in the opposite order, carry out perform function, this should be by the present invention Embodiment person of ordinary skill in the field understood.

In order to reduce the electric quantity balancing number of times of set of cells thus improving the efficiency of the discharge and recharge of set of cells, the present invention proposes one Plant the electric quantity balancing method and apparatus of set of cells.Below with reference to the accompanying drawings the electric quantity balancing side of the set of cells of the embodiment of the present invention is described Method and device.

The electric quantity balancing method of set of cells proposed by the present invention, comprises the following steps：On the battery pack after electricity, obtain electricity The electricity of each cell obtain the time of repose of set of cells in the group of pond；Whether the time of repose judging set of cells is more than pre- If time threshold；If it is determined that being more than preset time threshold, then the electricity according to each cell of set of cells after electricity on this The electricity generating electricity on this is poor；Determine whether whether the electricity difference of electricity on this is poor more than the electricity of previous upper electricity；If Poor more than the electricity of previous upper electricity, then equilibrium threshold value is generated according to the electricity difference of electricity on this；And according to equilibrium threshold value Electric quantity balancing is carried out to each cell in set of cells.The method by equilibrium threshold value corrected in real time, thus Decrease the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells, extend the service life of set of cells.

Fig. 1 is the flow chart of the electric quantity balancing method of set of cells according to an embodiment of the invention.

As shown in figure 1, the electric quantity balancing method of the set of cells of the embodiment of the present invention comprises the steps.

Step S101, on the battery pack after electricity, obtains in set of cells the electricity of each cell and obtains set of cells Time of repose.

Specifically, on the battery pack after electricity, obtain the electricity of each cell in set of cells.In the present invention one In embodiment, the electricity of cell can be described with SOC, and the current dump energy of cell with the ratio of specified electric quantity is For the SOC of cell, for example, it is possible to use open circuit voltage method calculates the SOC of cell.

Additionally, on the battery pack electricity after, obtain set of cells time of repose.Specifically, because the SOC of cell exists Time of repose calculate in the case of being more than preset time threshold more accurately it is therefore desirable to obtain the time of repose of set of cells with In follow-up judgement.In an embodiment of the present invention, above-mentioned preset time threshold can be according to the type of set of cells, use time etc. Parameter is set, and in embodiments of the present invention preset time threshold is not limited.

Step S102, judges whether the time of repose of set of cells is more than preset time threshold.

Specifically, after obtaining the time of repose of set of cells, judge whether the time of repose of set of cells is more than Preset Time Threshold value, that is, judge whether set of cells have passed through sufficiently long time of repose.In embodiments of the present invention, enough if left standing for the time Long, then now in this set of cells, the SOC of each cell can be relatively stable, also relatively accurately and truer.

Step S103, if it is determined that being more than preset time threshold, then according to each cell of set of cells after electricity on this Electricity generate on this electricity electricity poor.

Specifically, if the time of repose of set of cells is more than preset time threshold, illustrate that set of cells have passed through long enough Time of repose, then calculate cell SOC will be more accurate.

More specifically, if it is determined that being more than preset time threshold, then according to each cell of set of cells after electricity on this Electricity generate on this electricity electricity poor, this on, electric electricity is poor uses Δ SOC_{Upper new}Represent, Δ SOC_{Upper new}By following formula It is calculated：

ΔSOC_{Upper new}=SOC_{Mean is upper new}-SOC_{Min is upper new}（1）

Wherein, SOC_{Mean is upper new}For on this electricity when set of cells SOC meansigma methodss, SOC_{Min is upper new}For on this electricity when set of cells The minima of middle cell SOC.

Step S104, determines whether whether the electricity difference of electricity on this is poor more than the electricity of previous upper electricity.

Specifically, judge the electricity difference Δ SOC of electricity on this_{Upper new}Whether more than previous electric electricity difference Δ SOC_{Upper old}.Its In, Δ SOC_{Upper old}It is calculated by following formula：

ΔSOC_{Upper old}=SOC_{Mean is upper old}-SOC_{Min is upper old}（2）

Wherein, SOC_{Mean is upper old}For the meansigma methodss of set of cells SOC during previous upper electricity, SOC_{Min is upper old}For set of cells during previous upper electricity The minima of middle cell SOC.

Step S105, the electricity if greater than previous upper electricity is poor, then generate equilibrium thresholding according to the electricity difference of electricity on this Value.

Specifically, if electric electricity difference Δ SOC on this_{Upper new}Electricity poor Δ SOC more than previous upper electricity_{Upper old}, then basis The electricity difference Δ SOC of electricity on this_{Upper new}Generate equilibrium threshold value.

More specifically, equilibrium threshold value is calculated by following formula：

ΔSOC_Limit=ΔSOC_Begin+K₁×ΔSOC_{Upper new}（3）

K₁=Q₁×SOH （4）

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginEqual for initial setting Weighing apparatus threshold value, Δ SOC_{Upper new}Poor, K for the electricity of electricity on this₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_Limit's Impact coefficient, SOH is the cycle life of set of cells, Q₁For SOH to K₁Impact coefficient.K₁、Q₁Can be obtained by test.

Step S106, carries out electric quantity balancing according to equilibrium threshold value to each cell in set of cells.

Specifically, electric quantity balancing is carried out to each cell in set of cells according to the equilibrium threshold value generating.For example, exist During the use of set of cells, the current (SOC of real-time judge_mean-SOC_min) and Δ SOC_LimitMagnitude relationship.When（SOC_mean- SOC_min）>ΔSOC_LimitWhen, open equalizing circuit, electric quantity balancing is carried out to each cell in set of cells, by SOC in set of cells Energy transfer in maximum cell is in the minimum cell of SOC；When（SOC_mean-SOC_min）<ΔSOC_LimitWhen, close Close equalizing circuit.Wherein, SOC_meanFor the meansigma methodss of current battery SOC, SOC_minFor cell SOC in current battery Minima.

The electric quantity balancing method of the set of cells of the embodiment of the present invention, by being corrected in real time to equilibrium threshold value, from And decrease the electric quantity balancing number of times of set of cells, improve the efficiency of battery set charge/discharge, extend the service life of set of cells.

Fig. 2 is the flow chart of the electric quantity balancing method of set of cells according to an embodiment of the invention.

As shown in Fig. 2 the electric quantity balancing method of the set of cells of the embodiment of the present invention comprises the steps.

Step S201, on the battery pack after electricity, obtains in set of cells the electricity of each cell and obtains set of cells Time of repose.

Specifically, on the battery pack after electricity, obtain the electricity of each cell in set of cells.In the present invention one In embodiment, the electricity of cell can be with state-of-charge SOC description, the current dump energy of cell and specified electric quantity Ratio be cell SOC, for example, it is possible to use open circuit voltage method calculate cell SOC.

Step S202, judges whether the time of repose of set of cells is more than preset time threshold.

Step S203, if it is determined that being more than preset time threshold, then according to each cell of set of cells after electricity on this Electricity generate on this electricity electricity poor.

ΔSOC_{Upper new}=SOC_{Mean is upper new}-SOC_{Min is upper new}（5）

Additionally, continuing executing with step S205 after step S203.

Step S204, if it is determined that no more than preset time threshold, then generates counterbalanced gate according to the electricity difference of previous upper electricity Limit value.

Specifically, if the time of repose of set of cells is not more than preset time threshold, illustrate that set of cells does not pass through foot Enough long time of repose, then using the electricity difference Δ SOC of previous upper electricity_{Upper old}The equilibrium threshold value generating is more accurate.Wherein, The electricity difference Δ SOC of previous upper electricity_{Upper old}It is calculated by following formula：

ΔSOC_{Upper old}=SOC_{Mean is upper old}-SOC_{Min is upper old}（6）

Wherein, SOC_{Mean is old}For the meansigma methodss of set of cells SOC during previous upper electricity, SOC_{Min is old}For in set of cells during previous upper electricity The minima of cell SOC.

ΔSOC_Limit=ΔSOC_Begin+K₁×ΔSOC_{Upper old}（7）

K₁=Q₁×SOH （8）

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginEqual for initial setting Weighing apparatus threshold value, Δ SOC_{Upper old}Poor, the K for the electricity of previous upper electricity₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_Limit's Impact coefficient, SOH is the cycle life of set of cells, Q₁For SOH to K₁Impact coefficient.K₁、Q₁Can be obtained by test.

Additionally, continuing executing with step S208 after step s 204.

Step S205, determines whether whether the electricity difference of electricity on this is poor more than the electricity of previous upper electricity.

Specifically, judge the electricity difference Δ SOC of electricity on this_{Upper new}Whether more than previous electric electricity difference Δ SOC_{Upper old}.Its In, Δ SOC_{Upper new}By formula（5）It is calculated, Δ SOC_{Upper old}By formula（6）It is calculated.

Step S206, the electricity if greater than previous upper electricity is poor, then generate equilibrium thresholding according to the electricity difference of electricity on this Value.

ΔSOC_Limit=ΔSOC_Begin+K₁×ΔSOC_{Upper new}（9）

K₁=Q₁×SOH （10）

Additionally, continuing executing with step S208 after step S206.

Step S207, if it is determined that on this electricity difference of electricity be not more than previous upper electricity electricity poor, then according on previous The electricity difference of electricity generates equilibrium threshold value.

Specifically, if electric electricity difference Δ SOC on this_{Upper new}It is not more than the electricity difference Δ SOC of previous upper electricity_{Upper old}, then root Electricity difference Δ SOC according to previous upper electricity_{Upper old}Generate equilibrium threshold value.

More specifically, equilibrium threshold value passes through above-mentioned formula（7）With（8）It is calculated.

Step S208, carries out electric quantity balancing according to equilibrium threshold value to each cell in set of cells.

The electric quantity balancing method of the set of cells of the embodiment of the present invention, is not more than Preset Time threshold in the time of repose of set of cells When the electricity difference of electricity is not more than the electricity difference of previous upper electricity during value or on this, the electricity difference from previous upper electricity generates equilibrium Threshold value, makes the equilibrium threshold value of generation more accurate, further reduces the electric quantity balancing number of times of set of cells, improve further The efficiency of the discharge and recharge of set of cells, extends the service life of set of cells.

After electricity in each set of cells, to Δ SOC_On（The electricity of upper electricity is poor）Carry out real time correction, then in every primary cell After the lower electricity of group, also will be to Δ SOC_Under（The electricity of lower electricity is poor）Carry out real time correction.Content described above describes electricity in set of cells Afterwards, by Δ SOC_OnCarry out real time correction to generate the detailed process of equilibrium threshold value, will be detailed below under set of cells To Δ SOC after electricity_UnderCarry out the process of real time correction and according to Δ SOC_UnderGenerate the process of equilibrium threshold value.

Fig. 3 be under set of cells according to an embodiment of the invention electricity after generate equilibrium threshold value to carry out electric quantity balancing The flow chart of method.

As shown in figure 3, generate equilibrium threshold value after electricity under set of cells being comprised the steps with the method carrying out electric quantity balancing.

Step S301, after electricity under set of cells, obtains in set of cells the electricity of each cell and obtains set of cells Overall electricity.

Specifically, after electricity under set of cells, obtain the electricity of each cell and the entirety of set of cells in set of cells Electricity, the overall electricity of set of cells is the summation of the electricity of each cell in set of cells.Wherein, the electricity of cell can To be described with state-of-charge SOC, the ratio of the current dump energy of cell and specified electric quantity is the SOC of cell. For example, it is possible to use open circuit voltage method calculates the SOC of cell.

Step S302, whether the overall electricity judging set of cells is less than default power threshold.

Specifically, more obvious, the institute being showed in set of cells deep discharge due to the discordance between cell To need the overall electricity of set of cells is made comparisons with default power threshold, that is, judge whether set of cells is deep discharge.Wherein, Default power threshold can be set according to parameters such as the type of set of cells, use times, in embodiments of the present invention to default Power threshold does not limit.

Step S303, if it is determined that less than default power threshold, then according to each cell of set of cells after this lower electricity Electricity generate this lower electricity electricity poor.

Specifically, if the overall electricity of set of cells is less than default power threshold, illustrate that set of cells is deep discharge, this When cell between discordance performance more obvious, thus according to each cell of set of cells after this lower electricity The electricity difference of this lower electricity that electricity generates is more accurate.The electricity difference of this lower electricity uses Δ SOC_{Lower new}Represent, Δ SOC_{Lower new}Pass through Following formula are calculated：

ΔSOC_{Lower new}=SOC_{New under mean}-SOC_{New under min}（11）

Wherein, SOC_{New under mean}For the meansigma methodss of set of cells SOC during this lower electricity, SOC_{New under min}For set of cells during this lower electricity The minima of middle cell SOC.

Additionally, continuing executing with step S305 after step S303.

Step S304, if it is determined that not less than default power threshold, then generate counterbalanced gate according to the electricity difference of previous lower electricity Limit value.

Specifically, if the overall electricity of set of cells is not less than default power threshold, illustrate that set of cells does not have depth to put Electricity, then according to the electricity difference Δ SOC of previous lower electricity_{Under old}The equilibrium threshold value generating is more accurate.Wherein, the electricity of previous lower electricity Amount difference Δ SOC_{Under old}It is calculated by following formula：

ΔSOC_{Under old}=SOC_{Old under mean}-SOC_{Old under min}（12）

Wherein, SOC_{Old under mean}For the meansigma methodss of set of cells SOC during previous lower electricity, SOC_{Old under min}For set of cells during previous lower electricity The minima of middle cell SOC.

ΔSOC_Limit=ΔSOC_Begin+K₁×Max（ΔSOC_{Upper new}, Δ SOC_{Upper old}）+K₂×ΔSOC_{Under old}（13）

K₁=Q₁×SOH （14）

K₂=Q₂×SOH （15）

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginEqual for initial setting Weighing apparatus threshold value, Δ SOC_{Upper new}Poor, Δ SOC for the electricity of electricity on this_{Upper old}Poor, the Δ SOC for the electricity of previous upper electricity_{Under old}Under previous The electricity of electricity is poor, K₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_LimitImpact coefficient, K₂For Δ SOC_{Lower new}And/or ΔSOC_{Under old}To equilibrium threshold delta SOC_LimitImpact coefficient, SOH be set of cells cycle life, Q₁For SOH to K₁Impact coefficient, Q₂For SOH to K₂Impact coefficient.K₁、K₂、Q₁、Q₂Can be obtained by test.

Additionally, continuing executing with step S308 after step S304.

Step S305, determines whether whether the electricity difference of this lower electricity is poor more than the electricity of previous lower electricity.

Specifically, judge the electricity difference Δ SOC of this lower electricity_{Lower new}Whether more than previous lower electric electricity difference Δ SOC_{Under old}.Its In, Δ SOC_{Lower new}By formula（11）It is calculated, Δ SOC_{Under old}By formula（12）It is calculated.

Step S306, the electricity if greater than previous lower electricity is poor, then generate equilibrium thresholding according to the electricity difference of this lower electricity Value.

Specifically, if the electricity difference Δ SOC of this lower electricity_{Lower new}Electricity poor Δ SOC more than previous lower electricity_{Under old}, then basis The electricity difference Δ SOC of this lower electricity_{Lower new}Generate equilibrium threshold value.

ΔSOC_Limit=ΔSOC_Begin+K₁×Max（ΔSOC_{Upper new}, Δ SOC_{Upper old}）+K₂×ΔSOC_{Lower new}（16）

K₁=Q₁×SOH （17）

K₂=Q₂×SOH （18）

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginEqual for initial setting Weighing apparatus threshold value, Δ SOC_{Upper new}Poor, Δ SOC for the electricity of electricity on this_{Upper old}Poor, the Δ SOC for the electricity of previous upper electricity_{Lower new}For under this Electricity when electric is poor, K₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_LimitImpact coefficient, K₂For Δ SOC_{Lower new}With/ Or Δ SOC_{Under old}To equilibrium threshold delta SOC_LimitImpact coefficient, SOH be set of cells cycle life, Q₁For SOH to K₁Impact system Number, Q₂For SOH to K₂Impact coefficient.K₁、K₂、Q₁、Q₂Can be obtained by test.

Additionally, continuing executing with step S308 after step S306.

Step S307, if it is determined that the electricity that electricity difference of this lower electricity is not more than previous lower electricity is poor, then according under previous The electricity difference of electricity generates equilibrium threshold value.

Specifically, if the electricity difference Δ SOC of this lower electricity_{Lower new}It is not more than the electricity difference Δ SOC of previous lower electricity_{Under old}, then root Electricity difference Δ SOC according to previous lower electricity_{Under old}Generate equilibrium threshold value.

More specifically, equilibrium threshold value passes through above-mentioned formula（13）~（15）It is calculated.

Step S308, carries out electric quantity balancing according to equilibrium threshold value to each cell in set of cells.

After electricity under set of cells, equilibrium threshold value is also carried out correcting in real time, further improves equilibrium threshold value Accuracy, thus decreasing the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells, extending battery The service life of group.

In one embodiment of the invention, the embodiment shown in Fig. 2 and the embodiment shown in Fig. 3 are combined, each All equilibrium threshold value is corrected in real time so that equalizing threshold value more after electricity in set of cells and after electricity under each set of cells Accurately, thus decreasing the electric quantity balancing number of times of set of cells, improve the efficiency of the discharge and recharge of set of cells, extending set of cells Service life.

In order to realize above-described embodiment, the present invention also proposes a kind of electric quantity balancing device of set of cells.

A kind of electric quantity balancing device of set of cells, including：Upper electricity acquisition module, after electricity on the battery pack, obtains The electricity of each cell obtain the time of repose of set of cells in set of cells；Upper electricity judge module, for judging set of cells Time of repose whether be more than preset time threshold；Upper power consumption difference generation module, for if it is determined that be more than Preset Time threshold Value, then generate electric electricity on this according to the electricity of each cell of set of cells after electricity on this poor；Upper power consumption difference is sentenced Disconnected module, whether the electricity difference for determining whether electricity on this is poor more than the electricity of previous upper electricity；Upper electric switch limit value generates Module, poor for the electricity if greater than previous upper electricity, then equilibrium threshold value is generated according to the electricity difference of electricity on this；And on Electrical equalization module, for carrying out electric quantity balancing according to equilibrium threshold value to each cell in set of cells.It is right that this device passes through Equilibrium threshold value is corrected in real time, thus decreasing the electric quantity balancing number of times of set of cells, improves the discharge and recharge of set of cells Efficiency, extend the service life of set of cells.

Fig. 4 is the structural representation of the electric quantity balancing device of set of cells according to an embodiment of the invention.

As shown in figure 4, the electric quantity balancing device of set of cells includes：Upper electricity acquisition module 100, upper electricity judge module 200, on Power consumption difference generation module 300, upper power consumption difference judge module 400, upper electric switch limit value generation module 500, upper electrical equalization module 600.

Wherein, after upper electricity acquisition module 100 is for electricity on the battery pack, obtain the electricity of each cell in set of cells Measure and obtain the time of repose of set of cells.

Specifically, specifically, on the battery pack after electricity, upper electricity acquisition module 100 obtains each monomer electricity in set of cells The electricity in pond.In one embodiment of the invention, the electricity of cell can be described with SOC, current the remaining of cell The ratio of remaining electricity and specified electric quantity is the SOC of cell.For example, it is possible to use open circuit voltage method calculates monomer electricity The SOC in pond.

Additionally, on the battery pack electricity after, upper electricity acquisition module 100 obtain set of cells time of repose.Specifically, due to The SOC of cell calculates more accurately it is therefore desirable to obtain battery in the case that time of repose is more than preset time threshold The time of repose of group is for follow-up judgement.In an embodiment of the present invention, above-mentioned preset time threshold can be according to set of cells Type, the parameter such as use time set, in embodiments of the present invention preset time threshold is not limited.

Upper electricity judge module 200 is used for judging whether the time of repose of set of cells is more than preset time threshold.

Specifically, after upper electricity acquisition module 100 obtains the time of repose of set of cells, upper electricity judge module 200 is used for sentencing Whether the time of repose of disconnected set of cells is more than preset time threshold, that is, when judging whether set of cells have passed through sufficiently long standing Between.In embodiments of the present invention, if left standing for time long enough, then now in this set of cells each cell SOC meeting Relatively stable, also relatively accurately and truer.

Upper power consumption difference generation module 300 is used for if it is determined that being more than preset time threshold, then according to electricity after electricity on this The electricity that the electricity of pond each cell of group generates electricity on this is poor.

ΔSOC_{Upper new}=SOC_{Mean is upper new}-SOC_{Min is upper new}（19）

Whether upper power consumption difference judge module 400 is used for determining whether the electricity difference of electricity on this more than previous upper electricity Electricity is poor.

ΔSOC_{Upper old}=SOC_{Mean is upper old}-SOC_{Min is upper old}（20）

The electricity that upper electric switch limit value generation module 500 is used for if greater than previous upper electricity is poor, then the electricity according to electricity on this Amount difference generates equilibrium threshold value.

ΔSOC_Limit=ΔSOC_Begin+K₁×ΔSOC_{Upper new}（21）

K₁=Q₁×SOH （22）

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginEqual for initial setting Weighing apparatus threshold value, Δ SOC_{Upper new}Poor, Δ SOC for the electricity of electricity on this_UnderConcrete calculating and choosing method by embodiment below Middle introduction.K₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_LimitImpact coefficient, SOH be set of cells the circulation longevity Life, Q₁For SOH to K₁Impact coefficient, Q₂For SOH to K₂Impact coefficient.K₁、Q₁Can be obtained by test.

Upper electrical equalization module 600 is used for carrying out electric quantity balancing according to equilibrium threshold value to each cell in set of cells.

Specifically, upper electrical equalization module 600 is carried out to each cell in set of cells according to the equilibrium threshold value generating Electric quantity balancing.For example, during the use of set of cells, the current (SOC of upper electrical equalization module 600 real-time judge_mean- SOC_min) and Δ SOC_LimitMagnitude relationship.When（SOC_mean-SOC_min）>ΔSOC_LimitWhen, open equalizing circuit, to every in set of cells Individual cell carries out electric quantity balancing, by the energy transfer in the maximum cell of SOC in set of cells to the minimum monomer of SOC In battery；When（SOC_mean-SOC_min）<ΔSOC_LimitWhen, close equalizing circuit.Wherein, SOC_meanAverage for current battery SOC Value, SOC_minMinima for cell SOC in current battery.

The electric quantity balancing device of the set of cells of the embodiment of the present invention, equal by the generation in real time of upper electric switch limit value generation module Weighing apparatus threshold value carries out electric quantity balancing to each cell in set of cells, decreases the electric quantity balancing number of times of set of cells, improves The efficiency of the discharge and recharge of set of cells, extends the service life of set of cells.

In one embodiment of the invention, whether upper electricity judge module 200 judges the time of repose of set of cells more than pre- If during time threshold, the time of repose that also there is set of cells is not more than the situation of preset time threshold, then, upper power consumption bad student Become module 300 to be additionally operable to if it is determined that no more than preset time threshold, then equilibrium thresholding is generated according to the electricity difference of previous upper electricity Value.

ΔSOC_{Upper old}=SOC_{Mean is upper old}-SOC_{Min is upper old}（23）

ΔSOC_Limit=ΔSOC_Begin+K₁×ΔSOC_{Upper old}（24）

K₁=Q₁×SOH （25）

Whether upper power consumption difference judge module 400 determines whether the electricity difference of electricity on this more than previous electric electricity During difference, the electricity difference that also there is electricity on this is not more than the situation of previous electric electricity difference, then, upper electric switch limit value generates mould Block 500 is additionally operable to if it is determined that the electricity of the no more than previous upper electricity of electric electricity difference on this is poor, then the electricity according to previous upper electricity Amount difference generates equilibrium threshold value.

More specifically, equilibrium threshold value passes through above-mentioned formula（24）With（25）It is calculated.

The electric quantity balancing device of the set of cells of the embodiment of the present invention, when the time of repose of set of cells is not more than Preset Time threshold When the electricity difference of electricity is not more than the electricity difference of previous upper electricity during value or on this, the electricity difference from previous upper electricity generates equilibrium Threshold value, makes the equilibrium threshold value of generation more accurate, further decreases the electric quantity balancing number of times of set of cells, further Improve the efficiency of the discharge and recharge of set of cells, extend the service life of set of cells.

As shown in figure 5, the electric quantity balancing device of set of cells includes：Upper electricity acquisition module 100, upper electricity judge module 200, on Power consumption difference generation module 300, upper power consumption difference judge module 400, upper electric switch limit value generation module 500, upper electrical equalization module 600th, lower electricity acquisition module 700, lower electricity judge module 800, lower power consumption difference generation module 900, lower power consumption difference judge module 1000th, lower electric switch limit value generation module 1100 and lower electrical equalization module 1200.

If it is determined that no more than preset time threshold, upper power consumption difference generation module 300 is additionally operable to according to previous upper electricity Electricity difference generates equilibrium threshold value.

If it is determined that electricity of the no more than previous upper electricity of the electricity difference of electricity is poor on this, upper electric switch limit value generation module 500 It is additionally operable to generate equilibrium threshold value according to the electricity difference of previous upper electricity.

After lower electricity acquisition module 700 is used for electricity under set of cells, obtain the electricity of each cell in set of cells simultaneously Obtain the overall electricity of set of cells.

Specifically, after electricity under set of cells, lower electricity acquisition module 700 obtains the electricity of each cell in set of cells With the overall electricity of set of cells, the overall electricity of set of cells is the summation of the electricity of each cell in set of cells.Wherein, single The electricity of body battery can be with the ratio of specified electric quantity with state-of-charge SOC description, the current dump energy of cell The SOC of cell.

Whether lower electricity judge module 800 is used for judging the overall electricity of set of cells less than default power threshold.

Lower power consumption difference generation module 900 is used for if it is determined that being less than default power threshold, then according to electricity after this lower electricity The electricity that the electricity of pond each cell of group generates this lower electricity is poor.

ΔSOC_{Lower new}=SOC_{New under mean}-SOC_{New under min}（26）

Lower power consumption difference judge module 1000 is used for determining whether whether the electricity difference of this lower electricity is more than previous lower electricity Electricity poor.

Specifically, judge the electricity difference Δ SOC of this lower electricity_{Lower new}Whether more than previous lower electric electricity difference Δ SOC_{Under old}.Its In, Δ SOC_{Lower new}By formula（26）It is calculated, Δ SOC_{Under old}It is calculated by following formula：

ΔSOC_{Under old}=SOC_{Old under mean}-SOC_{Old under min}（27）

The electricity that lower electric switch limit value generation module 1100 is used for if greater than previous lower electricity is poor, then the electricity according to this lower electricity Amount difference generates equilibrium threshold value.

ΔSOC_Limit=ΔSOC_Begin+K₁×Max（ΔSOC_{Upper new}, Δ SOC_{Upper old}）+K₂×ΔSOC_{Lower new}（28）

K₁=Q₁×SOH （29）

K₂=Q₂×SOH （30）

Lower electrical equalization module 1200 is used for carrying out electric quantity balancing according to equilibrium threshold value to each cell in set of cells.

The electric quantity balancing device of the set of cells of the embodiment of the present invention, by upper electric switch limit value generation module, lower electric switch limit value Generation module is corrected in real time to equilibrium threshold value, and carries out electric quantity balancing to each cell in set of cells, enters one Step decreases the electric quantity balancing number of times of set of cells, further increases the efficiency of the discharge and recharge of set of cells, extends set of cells Service life.

In one embodiment of the invention, whether lower electricity judge module 800 judges the overall electricity of set of cells less than pre- If during power threshold, the overall electricity that also there is set of cells is not less than the situation of default power threshold, then, lower power consumption bad student Module 900 is become to be additionally operable to if it is determined that not less than default power threshold, then generating equilibrium thresholding according to the electricity difference of previous lower electricity Value.

Specifically, if the overall electricity of set of cells is not less than default power threshold, illustrate that set of cells does not have depth to put Electricity, then according to the electricity difference Δ SOC of previous lower electricity_{Under old}The equilibrium threshold value generating is more accurate.Wherein, the electricity of previous lower electricity Amount difference Δ SOC_{Under old}By formula（27）It is calculated.

ΔSOC_Limit=ΔSOC_Begin+K₁×Max（ΔSOC_{Upper new}, Δ SOC_{Upper old}）+K₂×ΔSOC_{Under old}（31）

K₁=Q₁×SOH （32）

K₂=Q₂×SOH （33）

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginEqual for initial setting Weighing apparatus threshold value, Δ SOC_{Upper new}Poor, Δ SOC for the electricity of electricity on this_{Upper old}Poor, the Δ SOC for the electricity of previous upper electricity_{Under old}Under previous Electricity when electric is poor, K₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_LimitImpact coefficient, K₂For Δ SOC_{Lower new}With/ Or Δ SOC_{Under old}To equilibrium threshold delta SOC_LimitImpact coefficient, SOH be set of cells cycle life, Q₁For SOH to K₁Impact system Number, Q₂For SOH to K₂Impact coefficient.K₁、K₂、Q₁、Q₂Can be obtained by test.

Lower power consumption difference judge module 1000 is used for determining whether whether the electricity difference of this lower electricity is more than previous lower electricity Electricity difference when, also exist this lower electricity electricity difference be not more than previous lower electricity electricity difference situation, then, lower electric switch limit value Generation module 1100 is additionally operable to if it is determined that electricity difference of this lower electricity electricity of being not more than previous lower electricity is poor, then according under previous The electricity difference of electricity generates equilibrium threshold value.

More specifically, equilibrium threshold value passes through above-mentioned formula（31）~（33）It is calculated.

The electric quantity balancing device of the set of cells of the embodiment of the present invention, when the overall electricity of set of cells is not less than default electricity threshold During value or this lower electricity electricity difference be not more than previous lower electricity electricity difference when, the electricity difference from previous upper electricity generates equilibrium Threshold value, makes the equilibrium threshold value of generation more accurate, further decreases the electric quantity balancing number of times of set of cells, further Improve the efficiency of the discharge and recharge of set of cells, extend the service life of set of cells.

It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned In embodiment, the software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage Or firmware is realizing.For example, if realized with hardware, and the same in another embodiment, can use well known in the art under Any one of row technology or their combination are realizing：There is the logic gates for data signal is realized with logic function Discrete logic, there is the special IC of suitable combinational logic gate circuit, programmable gate array（PGA）, scene Programmable gate array（FPGA）Deng.

In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any One or more embodiments or example in combine in an appropriate manner.

Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not Multiple changes, modification, replacement and modification can be carried out to these embodiments in the case of the principle of the disengaging present invention and objective, this The scope of invention is limited by claim and its equivalent.

Claims

1. a kind of electric quantity balancing method of set of cells is it is characterised in that comprise the following steps：

On the battery pack after electricity, obtain in described set of cells the electricity of each cell and obtain the standing of described set of cells Time；

Judge whether the time of repose of described set of cells is more than preset time threshold；

If it is determined that being more than described preset time threshold, then the electricity according to described each cell of set of cells after electricity on this The electricity generating on this electricity is poor, wherein, the state-of-charge of set of cells when the electricity difference of this upper electricity described is electric equal on this Meansigma methodss and on this electricity when set of cells in cell the minima of state-of-charge between difference；

Determine whether whether the electricity difference of this upper electricity described is poor more than previous electric electricity；

Electricity if greater than described previous upper electricity is poor, then the electricity impact that is poor and equalizing threshold value according to this upper electricity described Coefficient generates equilibrium threshold value, and wherein, the impact coefficient of described equilibrium threshold value is obtained by test；And

Electric quantity balancing is carried out to each cell in described set of cells according to described equilibrium threshold value.

2. the method for claim 1 is it is characterised in that also include：

If it is determined that no more than described preset time threshold, then described equilibrium thresholding is generated according to the electricity difference of described previous upper electricity Value.

3. the method for claim 1 is it is characterised in that also include：

If it is determined that the electricity that the electricity difference of described electricity on this is not more than previous upper electricity is poor, then according to described previous electric electricity Amount difference generates described equilibrium threshold value.

4. the method for claim 1 is it is characterised in that also include：

After electricity under set of cells, obtain in described set of cells the electricity of each cell and obtain the entirety of described set of cells Electricity；

Whether the overall electricity judging described set of cells is less than default power threshold；

If it is determined that being less than described default power threshold, then the electricity according to described each cell of set of cells after this lower electricity The electricity generating this lower electricity is poor；

Determine whether whether the electricity difference of this lower electricity described is poor more than the electricity of previous lower electricity；

Electricity if greater than described previous lower electricity is poor, then generate described equilibrium thresholding according to the electricity difference of this lower electricity described Value；And

5. method as claimed in claim 4 is it is characterised in that also include：

If it is determined that being not less than described default power threshold, then described equilibrium thresholding is generated according to the electricity difference of described previous lower electricity Value.

6. method as claimed in claim 4 is it is characterised in that also include：

If it is determined that the electricity that the electricity difference of this lower electricity described is not more than previous lower electricity is poor, then the electricity according to described previous lower electricity Amount difference generates described equilibrium threshold value.

7. the method as described in any one of claim 1-6 is it is characterised in that generate described equilibrium thresholding by below equation Value：

K₁=Q₁×SOH (2)

K₂=Q₂×SOH (3)

Wherein, SOC (State Of Charge) is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginFor The initial equilibrium threshold value setting, Δ SOC_{Upper new}Poor, Δ SOC for the electricity of electricity on this_{Upper old}Poor, the Δ for the electricity of previous upper electricity SOC_{Lower new}Poor, the Δ SOC for the electricity of this lower electricity_{Under old}Poor, the K for the electricity of previous lower electricity₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equal Weighing apparatus threshold delta SOC_LimitImpact coefficient, K₂For Δ SOC_{Lower new}And/or Δ SOC_{Under old}To equilibrium threshold delta SOC_LimitImpact coefficient, SOH For the cycle life of set of cells, Q₁For SOH to K₁Impact coefficient, Q₂For SOH to K₂Impact coefficient.

8. a kind of electric quantity balancing device of set of cells is it is characterised in that include：

Upper electricity acquisition module, after electricity on the battery pack, obtains in described set of cells the electricity of each cell and obtains Take the time of repose of described set of cells；

Upper electricity judge module, whether the time of repose for judging described set of cells is more than preset time threshold；

Upper power consumption difference generation module, for if it is determined that being more than described preset time threshold, then according to described after electricity on this The electricity that the electricity of each cell of set of cells generates on this electricity is poor, and wherein, the electricity difference of this upper electricity described is equal to originally The minimum of the meansigma methodss of state-of-charge of set of cells and the state-of-charge of cell in this set of cells when upper electric during secondary upper electricity Difference between value；

Whether upper power consumption difference judge module, for determining whether the electricity difference of this upper electricity described more than previous electric electricity Amount is poor；

Upper electric switch limit value generation module, poor for the electricity if greater than described previous upper electricity, then according to described electric on this The impact coefficient of electricity difference and equilibrium threshold value generates equilibrium threshold value, and wherein, the impact coefficient of described equilibrium threshold value passes through Test obtains；And

Upper electrical equalization module, equal for electricity is carried out to each cell in described set of cells according to described equilibrium threshold value Weighing apparatus.

9. device as claimed in claim 8 is it is characterised in that described upper power consumption difference generation module is additionally operable to：If it is determined that It is not more than described preset time threshold, then described equilibrium threshold value is generated according to the electricity difference of described previous upper electricity.

10. device as claimed in claim 8 is it is characterised in that described upper electric switch limit value generation module is additionally operable to：If it is determined that The electricity that the electricity difference of described electricity on this is not more than previous upper electricity is poor, then described in the electricity difference generation according to described previous upper electricity Equilibrium threshold value.

11. devices as claimed in claim 8 are it is characterised in that also include：

Lower electricity acquisition module, after electricity under set of cells, obtains in described set of cells the electricity of each cell and obtains Take the overall electricity of described set of cells；

Whether lower electricity judge module, for judging the overall electricity of described set of cells less than default power threshold；

Lower power consumption difference generation module, for if it is determined that being less than described default power threshold, then according to described after this lower electricity The electricity that the electricity of each cell of set of cells generates this lower electricity is poor；

The poor judge module of lower power consumption, whether electricity difference for determining whether this lower electricity described is more than the electricity of previous lower electricity Amount is poor；

Lower electric switch limit value generation module, poor for the electricity if greater than described previous lower electricity, then according to this lower electricity described Electricity difference generates described equilibrium threshold value；And

Lower electrical equalization module, equal for electricity is carried out to each cell in described set of cells according to described equilibrium threshold value Weighing apparatus.

12. devices as claimed in claim 11 are it is characterised in that described lower power consumption difference generation module is additionally operable to：If sentenced Break and be not less than described default power threshold, then described equilibrium threshold value is generated according to the electricity difference of described previous lower electricity.

13. devices as claimed in claim 11 are it is characterised in that described lower electric switch limit value generation module is additionally operable to：If sentenced The electricity that the electricity difference of disconnected this lower electricity described is not more than previous lower electricity is poor, then generate institute according to the electricity difference of described previous lower electricity State equilibrium threshold value.

14. devices as described in any one of claim 8-13 are it is characterised in that generate described equilibrium thresholding by below equation Value：

K₁=Q₁×SOH (2)

K₂=Q₂×SOH (3)

Wherein, SOC is the state-of-charge of cell, Δ SOC_LimitFor equalizing threshold value, Δ SOC_BeginFor the initial counterbalanced gate setting Limit value, Δ SOC_{Upper new}Poor, Δ SOC for the electricity of electricity on this_{Upper old}Poor, the Δ SOC for the electricity of previous upper electricity_{Lower new}For this lower electricity Electricity is poor, Δ SOC_{Under old}Poor, the K for the electricity of previous lower electricity₁For Δ SOC_{Upper new}And/or Δ SOC_{Upper old}To equilibrium threshold delta SOC_LimitShadow Ring coefficient, K₂For Δ SOC_{Lower new}And/or Δ SOC_{Under old}To equilibrium threshold delta SOC_LimitImpact coefficient, SOH be set of cells the circulation longevity Life, Q₁For SOH to K₁Impact coefficient, Q₂For SOH to K₂Impact coefficient.