CN102255114B - Method and device for uniform charge and discharge of batteries - Google Patents
Method and device for uniform charge and discharge of batteries Download PDFInfo
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- CN102255114B CN102255114B CN201110107550XA CN201110107550A CN102255114B CN 102255114 B CN102255114 B CN 102255114B CN 201110107550X A CN201110107550X A CN 201110107550XA CN 201110107550 A CN201110107550 A CN 201110107550A CN 102255114 B CN102255114 B CN 102255114B
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Abstract
The invention relates to a method and a device for uniform charge and discharge of batteries. The method comprises the following steps: S1) sampling single battery pack voltages of battery packs connected in series and calculating an average battery pack voltage of all the battery packs connected in series on the basis of the single battery pack voltages; S2) calculating single battery pack voltage differences of all battery packs connected in series according to the average battery pack voltage and the single battery pack voltages; S3) on the basis of the single battery pack voltage differences and a preset voltage difference, using a Newton iteration algorithm to update unit balanced AH (Ampere Hour) values for all batteries in all the battery packs connected in series; and S4) controlling the uniform charge time for all the battery packs connected in series on the basis of the unit balanced AH values. According to the method and the device for uniform charge and discharge of the batteries provided by the invention, the Newton iteration algorithm is utilized to control the uniform charge time for all the battery packs connected in series so that all the battery packs connected in series have uniform charge and discharge statuses, thereby improving the use ratio of the batteries and prolonging the service life of the batteries.
Description
Technical field
The present invention relates to the battery control field, more particularly, relate to a kind of battery balanced charging/discharging thereof and device.
Background technology
The use that battery need to be together in series of the application scenario of present most of battery.Therefore, the battery of wishing all series connection can be full of simultaneously electricity and emptying is electric, under this operating mode the useful life of battery the longest, utilization ratio is also the highest.But due to the restriction of manufacturing process, the characteristic of every Battery pack can be inconsistent,, if battery charging and discharging is not control effectively, is difficult to reach all batteries and is full of simultaneously and emptying.Therefore,, in the battery applications field, usually use the balance charge/discharge strategy to solve this problem.
The more advanced battery balanced strategy that discharges and recharges is active balancing electric weight method at present, and concrete principle is that every Battery pack voltage of sampling, determine that according to the voltage difference size equalizing charger of opening corresponding battery carries out the electric weight compensation to this Battery pack.Fig. 1 shows the theory diagram of the battery balanced charge and discharge device of prior art.As shown in Figure 1, K is that main path switch is controlled the main road charging, and each series battery batt1-battn has a corresponding equalizing charger (two-way DC/DC module).Wherein parallel with one another between each series battery, and comprise respectively the battery of a plurality of series connection in each series battery.Battery management system (BATTERY MONITOR SYSTEM, BMS) can detect cell voltage, charging and discharging currents etc.When certain Battery pack voltage surpasses preset range higher or lower than the value of average voltage, start corresponding equalizing charger, the battery pack that voltage is high provides energy by the DC/DC module to other batteries, the battery that voltage is low absorbs electric weight by the DC/DC module, thereby reaches the balance charge/discharge of all batteries.
Fig. 2 shows the lithium cell charging characteristic curve.Fig. 3 shows the lithium battery discharge characteristic curve.As shown in Figures 2 and 3,3.6V is that lithium battery completely fills a little, and 2.2V is lithium battery emptying point.If just according to voltage difference, carry out equilibrium, general effect is not very good, because lithium battery has a platform voltage, in this platform voltage left and right, all cell voltages are basically identical, if just according to voltage difference, come balanced, do not have balanced action near the longest platform voltage of time remaining, just in the initial stage that discharges and recharges and later stage, carry out equilibrium and move, will certainly cause balanced electric weight inadequate, the electric weight that can not full remuneration differs.
Summary of the invention
The technical problem to be solved in the present invention is, battery balanced charge and discharge device for prior art can only carry out the equilibrium action at the initial stage that discharges and recharges and later stage, will certainly cause balanced electric weight inadequate, the electric weight that can not full remuneration differs, provide battery balanced charging/discharging thereof and device that a kind of battery set charge/discharge state that can make all series connection can be more consistent.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of battery balanced charging/discharging thereof, comprise.
S1. the single Battery pack voltage of each series battery of sampling, and calculate the average cell group voltage of all series batteries based on described single Battery pack voltage;
S2., based on described average cell group voltage and described single Battery pack voltage, calculate single group voltage difference of described each series battery;
S3. poor based on described single group voltage difference and predeterminated voltage, the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit;
S4. based on the equalizing charge time of the balanced AH numerical control system of described unit to each series battery.
In battery balanced charging/discharging thereof of the present invention, described step S3 further comprises:
S31. judge whether described single group voltage difference is poor greater than described predeterminated voltage, if execution step S33, otherwise execution step S32;
S32. judge whether described single group voltage difference is poor less than described predeterminated voltage, if execution step S34, otherwise execution step S4;
S33. determine whether and continue the first setting-up time, if select the first newton iteration formula upgrade the balanced AH number of described unit and perform step S4, otherwise continue to carry out described step S33;
S34. determine whether and continue the second setting-up time, if select the second newton iteration formula upgrade the balanced AH number of described unit and perform step S4, otherwise continue to carry out described step S34.
In battery balanced charging/discharging thereof of the present invention, described the first newton iteration formula is: the balanced AH number of the unit of renewal=(the balanced AH number of current unit+Newton iteration value)/2.
In battery balanced charging/discharging thereof of the present invention, described Newton iteration value is 0Ah-1Ah.
In battery balanced charging/discharging thereof of the present invention, described the second newton iteration formula is: the balanced AH number of the unit of the renewal=balanced AH number of current unit/2.
In battery balanced charging/discharging thereof of the present invention, described the first setting-up time is greater than described the second setting-up time.
In battery balanced charging/discharging thereof of the present invention, described step S4 further comprises:
S41. determine whether the balanced AH number of unit of each batteries all greater than 0, if execution step S42, otherwise execution step S43;
S42. travel through the balanced AH number of unit of described each batteries to search the balanced AH number of least unit, the balanced AH number of the unit of described each batteries is all deducted the balanced AH number of described least unit;
S43. based on the equalizing charge time of the balanced AH numerical control system of described unit to each series battery.
Another technical scheme that the present invention solves its technical problem employing is, construct a kind of battery balanced charge and discharge device, comprise a plurality of series batteries, main charging circuit, balance module of connection between described main charging circuit and each described series battery, and, for detection of the battery cell monitoring module that battery charging and discharging flows, it is characterized in that, described battery balanced charge and discharge device further comprises: sampling module, for single Battery pack voltage of each series battery of sampling;
The first computing module, for calculate the average cell group voltage of all series batteries based on described single Battery pack voltage;
The second computing module, be used for based on described average cell group voltage and described single Battery pack voltage, calculates single group voltage difference of described each series battery;
The iteration update module, it is poor to be used for based on described single group voltage difference and predeterminated voltage, and the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit;
Control module, be used for based on the balanced AH number of described unit and described battery charging and discharging current control master charging circuit through the equalizing charge time of described balance module to each series battery.
In battery balanced charge and discharge device of the present invention, described balance module is unidirectional DC/DC module or two-way DC/DC module.
In battery balanced charge and discharge device of the present invention, described iteration update module further comprises:
Whether the first identifying unit, be used for judging described single group voltage difference greater than poor and lasting the first setting-up time of described predeterminated voltage, output the first result of determination;
Whether the second identifying unit is used for judging described single group voltage difference less than poor and lasting the second setting-up time of described predeterminated voltage, output the second result of determination;
The iterative formula selected cell, select the first newton iteration formula or the second newton iteration formula to upgrade the balanced AH number of described unit based on described the first result of determination and the second result of determination.
Implement battery balanced charging/discharging thereof of the present invention and device, be that each batteries in each series battery is upgraded the equilibrium AH of unit number by adopting Newton iterative, thereby control the equalizing charge time to each series battery, can be so that the battery set charge/discharge state of all series connection be all consistent, thus utilance and the extending battery life of battery improved.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 shows the theory diagram of the battery balanced charge and discharge device of prior art;
Fig. 2 shows the lithium cell charging characteristic curve;
Fig. 3 shows the lithium battery discharge characteristic curve;
Fig. 4 shows the flow chart according to the battery balanced charging/discharging thereof of the present invention of the first embodiment of the present invention;
Fig. 5 shows the flow chart of battery balanced charging/discharging thereof of the present invention according to a second embodiment of the present invention;
Fig. 6 shows the flow chart of the battery balanced charging/discharging thereof of the present invention of a third embodiment in accordance with the invention;
Fig. 7 shows the theory diagram according to the battery balanced charge and discharge device of the present invention of the first embodiment of the present invention;
Fig. 8 shows the theory diagram of battery balanced charge and discharge device of the present invention according to a second embodiment of the present invention;
After Fig. 9 shows and adopts battery balanced charging/discharging thereof of the present invention to be full of electricity to battery, the differential chart of ceiling voltage and average voltage;
Figure 10 shows and adopts battery balanced charging/discharging thereof of the present invention when battery arrives emptying point, the differential chart of minimum voltage and average voltage;
Figure 11 shows and discharges and recharges in the cycle at every turn, the AH number of the actual utilization of series battery.
Embodiment
For those skilled in the art being understood better and implementing technical scheme of the present invention, a technical term of paper this area.The balanced AH number of unit refers to that main road often discharges and recharges 1Ah, the energy value that battery is filled with.
Fig. 4 shows the flow chart according to the battery balanced charging/discharging thereof of the present invention of the first embodiment of the present invention.
As shown in Figure 4, in step S1, single Battery pack voltage V1 of each series battery of sampling, V2, V3 ... Vn.To single Battery pack voltage V1, V2, V3 ... the Vn summation, can obtain total cell voltage Vsum.Can calculate subsequently the average cell group voltage Vave=Vsum/n of all series batteries.
In step S2, based on described average cell group voltage Vave and described single Battery pack voltage V1, V2, V3 ... Vn, calculate the list of described each series battery and organize voltage difference Ve1, Ve2, Ve3 ... Ven.
Organize voltage difference Ve1, Ve2, Ve3 based on described list in step S3 ... the poor Vref of Ven and predeterminated voltage, the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit.Wherein the balanced AH number of the unit of this each batteries can be that the balanced AH of charging unit counts Ac, can be also that the balanced AH of discharge unit counts Ad.At this, the balanced AH number of unit refers to that main road often discharges and recharges 1Ah, the energy value that battery is filled with.
In step S4,, based on the balanced AH number of described unit, can control the equalizing charge time to each series battery.Those skilled in the art know, single Battery pack voltage V1, V2, V3 ... Vn, the balanced AH of charging unit counts Ac, and the balanced AH of discharge unit counts Ad and can detect by battery monitor system, can be also predefined.The poor Vref of described predeterminated voltage can set based on actual conditions, and those skilled in the art can be according to the characteristic of each battery in battery pack, and the formation of battery pack is set.
Implement battery balanced charging/discharging thereof of the present invention, be that each batteries in each series battery is upgraded the equilibrium AH of unit number by adopting Newton iterative, thereby control the equalizing charge time to each series battery, can be so that the battery set charge/discharge state of all series connection be all consistent, thus utilance and the extending battery life of battery improved.
Fig. 5 shows the flow chart of battery balanced charging/discharging thereof of the present invention according to a second embodiment of the present invention.
As shown in Figure 5, in step S501, single Battery pack voltage V1 of each series battery of sampling, V2, V3 ... Vn.To single Battery pack voltage V1, V2, V3 ... the Vn summation, can obtain total cell voltage Vsum.Can calculate subsequently the average cell group voltage Vave=Vsum/n of all series batteries.
In step S502, based on described average cell group voltage Vave and described single Battery pack voltage V1, V2, V3 ... Vn, calculate the list of described each series battery and organize voltage difference Ve1, Ve2, Ve3 ... Ven.
In step S503, judge respectively described single group voltage difference Ve1, Ve2, Ve3 ... whether Ven is greater than the poor Vref of described predeterminated voltage.If execution step S504, otherwise execution step S507.
In step S504, determine whether and continue the first setting-up time,, if also do not arrive described the first setting-up time, continue execution step S504 and judge.If reach this first setting-up time, perform step S505, select the first newton iteration formula to upgrade the balanced AH number of described unit.
In the present embodiment, the balanced AH number of the unit of this each batteries can be that the balanced AH of charging unit counts Ac, can be also that the balanced AH of discharge unit counts Ad.
When being in battery charging process, the balanced AH of the charging unit of this renewal counts Ac '=(the balanced AH of current charging unit counts Ac+ Newton iteration value B)/2.
In the time of in being in battery discharge procedure, the balanced AH of the discharge unit of renewal counts the balanced AH of Ad '=current discharge unit and counts Ad/2.
After step S505, execution step S506, the balanced AH number of described unit of each series battery that obtains based on above-mentioned calculating, can control the equalizing charge time to each series battery.
For example, whether in step S506, at first can detect main charging circuit has increased the electric weight of 1AH.Increased the electric weight of 1AH if main charging circuit detected, open the corresponding equalizer of battery pack, battery pack is charged, until for the batteries charging electric weight is increased to, charge unit equilibrium AH number (in charging process, the balanced AH number of charging unit is Ac AH), or the balanced AH of discharge unit counts Ad AH (in discharge process, the balanced AH number of charging unit is Ad AH).
, when in step S503, judge described single group voltage difference Ve1, Ve2, Ve3 ... Ven is during not greater than the poor Vref of described predeterminated voltage, and execution step S507, judge respectively described single group voltage difference Ve1, Ve2, Ve3 ... whether Ven is less than the poor Vref of described predeterminated voltage.If it is perform step S508, otherwise perform step 506, directly based on the equalizing charge time of the balanced AH numerical control system of current unit to battery pack.
In step S508, determine whether and continue the second setting-up time., if also do not arrive described the second setting-up time, continue execution step S508 and judge.If reach this second setting-up time, perform step S509, select the second newton iteration formula to upgrade the balanced AH number of described unit.
In the present embodiment, the balanced AH number of the unit of this each batteries can be that the balanced AH of charging unit counts Ac, can be also that the balanced AH of discharge unit counts Ad.
When being in battery charging process, the balanced AH of the charging unit of this renewal counts Ac "=the balanced AH of current charging unit counts Ac/2.
In the time of in being in battery discharge procedure, the balanced AH of the discharge unit of renewal counts Ad "=(the balanced AH of current discharge unit counts Ad+ Newton iteration value B)/2.
Subsequently, execution step S506, the balanced AH number of described unit of each series battery that obtains based on above-mentioned calculating, can control the equalizing charge time to each series battery.In the present embodiment, described Newton iteration value is 0Ah-1Ah.Certain those skilled in the art also can select other value as the Newton iteration value according to actual needs.
By implementing embodiments of the invention, the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit, thereby control the equalizing charge time to each series battery, can be so that the battery set charge/discharge state of all series connection be all consistent, thus utilance and the extending battery life of battery improved.
In actual application, all series batteries balanced AH of unit that can occur charging counts Ac or the balanced AH of discharge unit and counts Ad greater than 0 situation, can cause so all equalizers all open-minded.And generally this situation is thought irrational, so, if detect to find that all balanced AH of charging unit count Ac or the balanced AH of discharge unit counted Ad greater than 0 o'clock, need to find out the balanced AH number of minimum unit, and with it as static error values.Fig. 6 shows such an embodiment.Step S601-603 in Fig. 6 can, with reference to the embodiment shown in Fig. 4 or 5, be not repeated at this.Below only step S604-607 is described in detail.
Step S604: judge that whether the balanced AH number of unit of each batteries is all greater than 0.At this, the balanced AH number of unit counts Ac for the balanced AH of charging unit or the balanced AH of discharge unit counts Ad.If so, perform step S605, the balanced AH number of the unit of described each batteries of traversal is to find out the balanced AH number of least unit.
Step S606: the balanced AH number of the unit of described each batteries is all deducted the balanced AH number of described least unit;
Step S607: based on the equalizing charge time of the balanced AH numerical control system of the described unit that obtains in step S606 to each series battery.All greater than 0 the time, directly perform step S607, based on the equalizing charge time of the balanced AH numerical control system of each batteries unit originally to each series battery when the balanced AH number of unit that all batteries not detected in step S604.
Fig. 7 shows the theory diagram according to the battery balanced charge and discharge device of the present invention of the first embodiment of the present invention.
As shown in Figure 7, the battery balanced charge and discharge device 100 of the present invention, comprise a plurality of series battery batt1, batt2 ... battn, main charging circuit 120, be connected to described main charging circuit 120 and described a plurality of series battery batt1, batt2 ... a plurality of balance modules 101 between battn, 102 ... 10n, and for detection of the battery cell monitoring module (BMS) 130 of battery charging and discharging stream.Wherein, described battery balanced charge and discharge device further comprises sampling module 410, the first computing module 420, the second computing module 430, iteration update module 440 and control module 450.
Wherein, described sampling module 410 is used for each series battery of sampling batt1, batt2 ..., single Battery pack voltage of battn.Described the first computing module 420, be used for based on described single Battery pack voltage V1, V2, V3 ... Vn calculates all series battery batt1, batt2 ..., the average cell group voltage Vave of battn.For example to single Battery pack voltage V1, V2, V3 ... the Vn summation, can obtain total cell voltage Vsum.Can calculate subsequently the average cell group voltage Vave=Vsum/n of all series batteries.Described the second computing module 430, be used for based on described average cell group voltage Vave and described single Battery pack voltage V1, V2, V3 ... Vn, calculate described each series battery batt1, batt2 ..., single group voltage difference Ve1 of battn, Ve2, Ve3 ... Ven.Described iteration update module 440 is used for based on described single group voltage difference Ve1, Ve2, Ve3 ... the poor Vref of Ven and predeterminated voltage, adopting Newton iterative is each series battery batt1, batt2..., each batteries in battn is upgraded the balanced AH number of unit.Described control module 450, be used for based on the balanced AH number of described unit and described battery charging and discharging current control master charging circuit through described balance module to each series battery batt1 batt2..., the equalizing charge time of battn.
Those skilled in the art know, described a plurality of balance modules 101,102,10n can be unidirectional DC/DC module, can be also two-way DC/DC module, perhaps wherein the partial-equilibrium module be unidirectional DC/DC module, and another part balance module is two-way DC/DC module.
Fig. 8 goes out the theory diagram of battery balanced charge and discharge device of the present invention according to a second embodiment of the present invention.As shown in Figure 8, described iteration update module 440 further comprises the first identifying unit 441, the second identifying unit 442 and iterative formula selected cell 443.Whether described the first identifying unit 441, be used for judging described single group voltage difference greater than poor and lasting the first setting-up time of described predeterminated voltage, output the first result of determination.Whether the second identifying unit 442 is used for judging described single group voltage difference less than poor and lasting the second setting-up time of described predeterminated voltage, output the second result of determination.Iterative formula selected cell 443, select the first newton iteration formula or the second newton iteration formula to upgrade the balanced AH number of described unit based on described the first result of determination and the second result of determination.Wherein the structure of the first identifying unit 441, the second identifying unit 442 and iterative formula selected cell 443 and realization can realize with reference to the method shown in Fig. 5.
Described control module 450 comprises that further AH counts identifying unit 451, minimum AH number is searched unit 452 and control unit 453.Wherein said AH counts identifying unit 451 and is used for determining whether that the balanced AH number of unit of each batteries is all greater than 0.When described AH counts the balanced AH number of unit that identifying unit 451 judges each batteries all greater than 0 the time, described minimum AH number is searched the balanced AH number of unit of unit 452 described each batteries of traversal to search the balanced AH number of least unit, and the balanced AH number of the unit of described each batteries is all deducted the balanced AH number of described least unit.Described control unit 453 is based on the equalizing charge time of the balanced AH numerical control system of described unit to each series battery.Wherein AH counts identifying unit 451, minimum AH number is searched the structure of unit 452 and control unit 453 and realizes and can realize with reference to the method shown in Fig. 6.
In order to verify the effect of the above-mentioned battery balanced charging/discharging thereof of the present invention and device, set up experiment porch, it is verified.
In this experiment, the balance module of the control battery charging and discharging time of employing is the 48V input, the DC/DC converter of 3.6V output, and maximum output current is 7.9A, wherein 48V is from battery.Lithium battery 13 joint parallel connections are one group, 15 groups of series connection, and the balanced AH number of the initial unit of every batteries is 4.5Ah.In addition, the lithium battery of choosing is random combine, start namely to exist the balanced AH of charging unit to count Ac and the balanced AH of discharge unit and count all different phenomenons of Ad, and there is a very poor situation of Battery pack characteristic in battery pack, close to damage, its reach that lithium battery completely fills a little and the speed of lithium battery emptying point all with other normal battery and very large difference.Battery for such combination, when starting charging and discharging, the voltage of each battery and the balanced AH of charging unit count Ac and the balanced AH of discharge unit to count Ad are very inconsistent, choose poor like this verification environment mainly for strong specific of the applicability of proof the method.
In the present embodiment, for parameter, select, the poor Vref of predeterminated voltage is 30mV, and Newton iteration value B is 0.36Ah, and the first setting-up time Toc is 600s, and the second setting-up time Tcc is 300s.
Test with the device of the method for embodiment corresponding to Fig. 4 of the present invention and embodiment corresponding to Fig. 8, obtained the experimental result of Fig. 9-11.This experimental result demonstration has adopted the effect of Newton iteration method equalizing charge remarkable.
Fig. 9 illustrate be full of the electricity after (any Battery pack reaches 3.6V), the differential chart of ceiling voltage and average voltage, all batteries of the less explanation of this difference from be full of simultaneously a little dreamboat more close to.As shown in Figure 9, after 9 Newton iterations of experience, the difference of ceiling voltage and average voltage is reduced to 0.09V from 0.27V.
Figure 10 illustrates and adopts battery balanced charging/discharging thereof of the present invention when battery arrives emptying point, the differential chart of minimum voltage and average voltage.In this example, any Battery pack reaches 2.7V, and choosing emptying point is 2.7V.Shown in Figure 10 is the differential chart of minimum voltage and average voltage, all batteries of the less explanation of this difference from the dreamboat of while emptying more close to.As shown in figure 10, after 9 Newton iterations of experience, the difference of minimum voltage and average voltage is reduced to 0.04V from 0.44V.
Figure 11 shows and discharges and recharges in the cycle at every turn, the AH number of the actual utilization of series battery, and the utilance of the larger explanation battery of this value is higher.As shown in figure 11, after 9 Newton iterations of experience, discharge and recharge in the cycle, the AH number of the actual utilization of series battery increases to 40AH from 0.67AH at every turn.
Therefore, implement battery balanced charging/discharging thereof of the present invention, by, the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit, thereby control the equalizing charge time to each series battery, can be so that the battery set charge/discharge state of all series connection be all consistent, thus utilance and the extending battery life of battery improved.
Although the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claims in the present invention scope.
Claims (5)
1. a battery balanced charging/discharging thereof, is characterized in that, described method comprises:
S1. the single Battery pack voltage of each series battery of sampling, and calculate the average cell group voltage of all series batteries based on described single Battery pack voltage;
S2., based on described average cell group voltage and described single Battery pack voltage, calculate single group voltage difference of described each series battery;
S3. poor based on described single group voltage difference and predeterminated voltage, the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit;
S4. based on the equalizing charge time of the balanced AH numerical control system of described unit to each series battery;
Wherein said step S3 further comprises:
S31. judge whether described single group voltage difference is poor greater than described predeterminated voltage, if execution step S33, otherwise execution step S32;
S32. judge whether described single group voltage difference is poor less than described predeterminated voltage, if execution step S34, otherwise execution step S4;
S33. determine whether and continue the first setting-up time, if select the first newton iteration formula upgrade the balanced AH number of described unit and perform step S4, otherwise continue to carry out described step S33;
S34. determine whether and continue the second setting-up time, if select the second newton iteration formula upgrade the balanced AH number of described unit and perform step S4, otherwise continue to carry out described step S34;
Wherein said the first newton iteration formula is: the balanced AH number of the unit of renewal=(the balanced AH number of current unit+Newton iteration value)/2, described Newton iteration value is 0Ah-1Ah, and described the second newton iteration formula is: the balanced AH number of the unit of the renewal=balanced AH number of current unit/2.
2. battery balanced charging/discharging thereof according to claim 1, is characterized in that, described the first setting-up time is greater than described the second setting-up time.
3. battery balanced charging/discharging thereof according to claim 1, is characterized in that, described step S4 further comprises:
S41. determine whether the balanced AH number of unit of each batteries all greater than 0, if execution step S42, otherwise execution step S43;
S42. travel through the balanced AH number of unit of described each batteries to search the balanced AH number of least unit, the balanced AH number of the unit of described each batteries is all deducted the balanced AH number of described least unit;
S43. based on the equalizing charge time of the balanced AH numerical control system of described unit to each series battery.
4. battery balanced charge and discharge device, comprise a plurality of series batteries, main charging circuit, balance module of connection between described main charging circuit and each described series battery, and for detection of the battery cell monitoring module of battery charging and discharging stream, it is characterized in that, described battery balanced charge and discharge device further comprises:
Sampling module, for single Battery pack voltage of each series battery of sampling;
The first computing module, for calculate the average cell group voltage of all series batteries based on described single Battery pack voltage;
The second computing module, be used for based on described average cell group voltage and described single Battery pack voltage, calculates single group voltage difference of described each series battery;
The iteration update module, it is poor to be used for based on described single group voltage difference and predeterminated voltage, and the employing Newton iterative is that each batteries in each series battery is upgraded the balanced AH number of unit;
Control module, be used for based on the balanced AH number of described unit and described battery charging and discharging current control master charging circuit through the equalizing charge time of described balance module to each series battery;
Wherein said iteration update module further comprises:
Whether the first identifying unit, be used for judging described single group voltage difference greater than poor and lasting the first setting-up time of described predeterminated voltage, output the first result of determination;
Whether the second identifying unit, be used for judging described single group voltage difference less than poor and lasting the second setting-up time of described predeterminated voltage, output the second result of determination;
The iterative formula selected cell, select the first newton iteration formula or the second newton iteration formula to upgrade the balanced AH number of described unit based on described the first result of determination and the second result of determination;
Wherein said the first newton iteration formula is: the balanced AH number of the unit of renewal=(the balanced AH number of current unit+Newton iteration value)/2, described Newton iteration value is 0Ah-1Ah, and described the second newton iteration formula is: the balanced AH number of the unit of the renewal=balanced AH number of current unit/2.
5. battery balanced charge and discharge device according to claim 4, is characterized in that, described balance module is unidirectional DC/DC module or two-way DC/DC module.
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