CN105150874A - Power battery management system and power supply control method thereof - Google Patents
Power battery management system and power supply control method thereof Download PDFInfo
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- CN105150874A CN105150874A CN201510687720.4A CN201510687720A CN105150874A CN 105150874 A CN105150874 A CN 105150874A CN 201510687720 A CN201510687720 A CN 201510687720A CN 105150874 A CN105150874 A CN 105150874A
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Abstract
The invention provides a power battery management system and a power supply control method thereof. The power battery management system comprises a BMU, a plurality of power battery modules and CSCs corresponding to the power battery modules. Each CSC comprises a first DC/DC and a second DC/DC, wherein the input end of the first DC/DC and the input end of the second DC/DC are both connected with the positive electrode and the negative electrode of the corresponding power battery module so as to take electricity from the power battery module, the output end of the first DC/DC is connected with the input end of the corresponding CSC and used for supplying power to the CSC, and the output end of the second DC/DC is connected with the input end of the BMU and used for supplying power to the BMU. Due to the adoption of the technical scheme, the power battery modules can serve as the only power supply for power battery systems, the size and weight of an electric automobile are reduced, and the cost of the electric automobile is reduced.
Description
Technical field
The present invention relates to power battery technology field, particularly relate to a kind of power battery management system and method for controlling power supply thereof.
Background technology
Along with national governments and car enterprise are to the attention of Electric Vehicle Projects and investment, some large car manufactures and battery supplier have done large quantity research and test for various electrokinetic cell, and successfully develop relevant battery management system (BatteryManagementSystem; BMS).
BMS is to electronlmobil (ElectricVehicle; EV) safe operation of car load, integrated vehicle control tactics are selected, the selection of charge mode and operation cost all have a great impact.No matter in vehicle operation or in process of charging, BMS will complete real-time monitoring and the trouble diagnosing of battery status, and inform entire car controller or battery charger by the mode of bus, to adopt rational control policy, reach effective and the object of effective use electrokinetic cell.
But existing BMS medium power battery only provides power as electrical source of power to EV, and other unit in battery management system, as electrokinetic cell monitoring unit (CellSupervisionCircuit; CSC), battery management system unit (BatteryManagementUnit; BMU), current data collecting unit (CurrentSupervisionUnit; And insulation monitoring module (IsolationMonitorModule CSU); Etc. IMM) all external power source is needed.And in a BMS, generally having multiple CSC and BMU etc., this just causes whole EV system peripheral power supply too much, adds EV volume, weight and cost.
Summary of the invention
The invention provides a kind of power battery management system and method for controlling power supply thereof, too much to solve whole EV system peripheral power supply, add the problem of EV volume, weight and cost.
The invention provides a kind of power battery management system, described system comprises electrokinetic cell monitoring unit corresponding to electrokinetic cell administrative unit, multiple electrokinetic cell module and each described electrokinetic cell module;
Described electrokinetic cell monitoring unit comprises the first DC decompression power module and the second DC decompression power module; Described first DC decompression power module is all connected with the both positive and negative polarity of corresponding described electrokinetic cell module with the input end of described second DC decompression power module, power taking from described electrokinetic cell module;
The mouth of described first DC decompression power module connects with the input end of corresponding described electrokinetic cell monitoring unit, powers for giving described electrokinetic cell monitoring unit; The mouth of described second DC decompression power module is connected with the input end of described electrokinetic cell administrative unit, powers for giving described electrokinetic cell administrative unit.
The present invention also provides a kind of method for controlling power supply of power battery management system, and described method comprises:
According to each open circuit voltage of electrokinetic cell module and the mapping table of dump energy, obtain the size of the dump energy of each described electrokinetic cell module;
The size of the described dump energy of more each described electrokinetic cell module, obtains minimum dump energy;
According to described minimum dump energy, calculate the described dump energy of other each described electrokinetic cell module and the difference of described minimum dump energy;
According to the generating capacity of each described electrokinetic cell module of described mathematic interpolation;
According to the described generating capacity of each described electrokinetic cell module, each described electrokinetic cell module is sorted from big to small according to described generating capacity;
Gather the size of the received current of each described electrokinetic cell administrative unit;
Obtain the size of the described received current of each described electrokinetic cell administrative unit, calculate the number M of the described electrokinetic cell module needing generating;
According to described M the electrokinetic cell module calculating gained, from each described electrokinetic cell module after the descending sequence of described generating capacity, choose M+1 electrokinetic cell module from big to small successively power;
Control described M+1 electrokinetic cell module to power.
Further, in the method for controlling power supply of power battery management system described above, the method for controlling power supply adopted in each described electrokinetic cell module, comprising:
Gather the electricity of each battery core in each described electrokinetic cell module;
Judge whether the electricity of each described battery core is greater than default battery core charge value;
When the electricity of described battery core is greater than described default battery core charge value, control the described electrokinetic cell module transfer of electricity to correspondence of corresponding described battery core.
When the electricity of described battery core is less than described default battery core charge value, control the described battery core transfer of electricity to correspondence of corresponding described electrokinetic cell module.
Power battery management system of the present invention, the CSC being correspondence by the DC/DC power taking from power battery modules in each CSC powers, and the 2nd DC/DC controlled in each CSC powers to BMU1, make each electrokinetic cell module in BMS both can provide power as electrical source of power to EV, power supply can be provided again as the CSC etc. of control power supply to BMU1 or correspondence, make the CSC etc. of BMU1 or correspondence not need external power supply, achieve self-powered.Adopt technical scheme of the present invention that each electrokinetic cell module can be made as the sole source of BMS system, reduce EV volume and weight, and decrease the cost of EV.
The method for controlling power supply of power battery management system of the present invention, by gathering the OCV of each electrokinetic cell module, and be sent to BMU, the electrokinetic cell module number M needing generating is calculated by BMU, and according to the electrokinetic cell module of sequence control M+1 from big to small, the parts beyond CSC are powered, achieve the electrokinetic cell module preferential discharge to higher generating capacity, balance the generating capacity between electrokinetic cell module.Adopt technical scheme of the present invention can improve the performance of electrokinetic cell module and the service life of electrokinetic cell module.
The method for controlling power supply of power battery management system of the present invention, also by gathering the electricity of each battery core in each electrokinetic cell module, when there is battery core voltage in each electrokinetic cell module and being greater than or less than default battery core charge value, the electricity achieved between battery core and electrokinetic cell module shifts, balance the electricity of each battery core in electrokinetic cell module, improve the performance of electrokinetic cell module.Adopt the technical scheme of the present embodiment can improve the performance of electrokinetic cell module and the service life of electrokinetic cell module.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of an embodiment of power battery management system of the present invention;
Fig. 2 is the structural representation of another embodiment of power battery management system of the present invention;
Fig. 3 is the circuit diagram of the power battery management system of first electrokinetic cell module 21 correspondence in Fig. 2;
Fig. 4 is the structural representation of the embodiment of the electrokinetic cell bag of power battery management system of the present invention;
Fig. 5 is the structural representation of an embodiment again of power battery management system of the present invention;
Fig. 6 is the diagram of circuit of an embodiment of the method for controlling power supply of power battery management system of the present invention;
Fig. 7 is the diagram of circuit of another embodiment of the method for controlling power supply of power battery management system of the present invention.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural representation of an embodiment of power battery management system of the present invention, and as shown in Figure 1, the power battery management system of the present embodiment comprises CSC corresponding to BMU1, multiple electrokinetic cell module and each power battery module module.As shown in Figure 1, the power battery management system of the present embodiment is that to comprise n electrokinetic cell module be example, as shown in Figure 1, the power battery management system of the present embodiment specifically can comprise first electrokinetic cell module, 21, second electrokinetic cell module 22 ... n-th electrokinetic cell module 2n, and first CSC31, second CSC32 that each electrokinetic cell module is corresponding ..., the n-th CSC3n.
Wherein first CSC31 is fixed on first corresponding electrokinetic cell module 21 by shell, is connected with wire harness by AUI with the both positive and negative polarity of each battery core in electrokinetic cell module 21 and the both positive and negative polarity of first electrokinetic cell module 21.
First CSC31 comprises the first DC decompression power module (Direct-current/Direct-currentModule; Hereinafter referred to as DC/DC) 311 and the 2nd DC/DC312; One DC/DC311 is all connected with the both positive and negative polarity of corresponding first electrokinetic cell module 21 with the input end of the 2nd DC/DC312, for power taking from first electrokinetic cell module 21 of correspondence.The mouth of the one DC/DC311 connects with the input end of corresponding CSC31, and a DC/DC311 is used for powering to CSC31; The mouth of the 2nd DC/DC312 is connected with the input end of BMU1, and the 2nd DC/DC312 is used for powering to BMU1.Such as, one DC/DC311 power taking from first electrokinetic cell module 21 of correspondence, voltage transitions is become the voltage that driving first CSC31 normally works, first CSC31 is powered, in practical application, a DC/DC311 is to the micro control unit (MicroControlUnit in first CSC31; MCU) power, thus first CSC31 can be controlled normally work.2nd DC/DC312 power taking from first electrokinetic cell module 21, by the voltage that voltage transitions becomes to drive BMU1 normally to work, control BMU1 normally works.And, the first switch can also be set in first CSC31, such as, particularly by the first switch-linear hybrid between the circuit of the 2nd DC/DC312 and BMU1, for controlling the 2nd DC/DC312, BMU1 is powered.
Particularly, after first CSC31 normally works, conducting or the disconnection of the first switch can be controlled by the MCU in first CSC31, when first CSC31 detect need to power to BMU1 time, MCU controls the first switch conduction, 2nd DC/DC312 is powered to BMU1, otherwise MCU control the first switch disconnection, and the 2nd DC/DC312 is not powered to BMU1.When BMU1 obtain electric after because the load (Load) in BMU1 and EV is as connections such as the electronic devices and components such as relay, CSU (current acquisition module CurrentSupervisionunit), IMM (insulation monitoring module IsolationMonitorModule), drive described Load or CSU normally to work, thus realize the self-powered of whole BMS system.
It should be noted that, in the present embodiment, second electrokinetic cell module 22 ... n-th electrokinetic cell module 2n is identical with first electrokinetic cell module 21, second CSC32 ... n-th CSC3n is identical with first CSC31, and the annexation between each electrokinetic cell module and corresponding CSC and principle of work please refer to noted earlier, illustrate no longer one by one at this.
The power battery management system of the present embodiment, the CSC being correspondence by the DC/DC power taking from power battery modules in each CSC powers, and the 2nd DC/DC controlled in each CSC powers to BMU1, make each electrokinetic cell module in BMS both can provide power as electrical source of power to EV, power supply can be provided again as the CSC etc. of control power supply to BMU1 or correspondence, make the CSC etc. of BMU1 or correspondence not need external power supply, achieve self-powered.Adopt the technical scheme of the present embodiment that each electrokinetic cell module can be made as the sole source of BMS system, reduce EV volume and weight, and decrease the cost of EV.
In the power battery management system of above-described embodiment, each electrokinetic cell module is composed in series by multiple battery core, and the varying in size of the electricity of each battery core, the words do not controlled, the battery core overdischarge that in electrokinetic cell module, electricity is lower can be caused during electric discharge, battery core overcharge that in electrokinetic cell module, electricity is lower can be caused during charging and then process of charging is terminated in advance, affecting the performance of electrokinetic cell module, shortening the service life of electrokinetic cell module.For solving the problem, the present invention also provides following power battery management system.
Fig. 2 is the structural representation of another embodiment of power battery management system of the present invention, and as shown in Figure 2, the power battery management system of the present embodiment is on basis embodiment illustrated in fig. 1, and first CSC31 further comprises the 3rd DC/DC313.One end of 3rd DC/DC313 connects with the both positive and negative polarity of each battery core in first group of battery core 211 in corresponding first electrokinetic cell module 21, and the other end of the 3rd DC/DC313 is connected with the both positive and negative polarity of first electrokinetic cell module 21, when the charge value that there is battery core in first electrokinetic cell module 21 is greater than default battery core charge value, electricity from the battery core power taking of correspondence, and is transferred to first corresponding electrokinetic cell module 21 by the 3rd DC/DC313, when the charge value that there is battery core in first electrokinetic cell module 21 is less than default battery core charge value, 3rd DC/DC313 power taking from first electrokinetic cell module 21 of correspondence, and electricity is transferred to corresponding battery core, thus make the 3rd DC/DC313 coordinate first CSC31 to realize the active equalization function of first electrokinetic cell module 21, particularly, the second switch corresponding with each battery core can be set in first CSC31, and second switch is arranged on the 3rd circuit between DC/DC313 and corresponding battery core, utilize second switch to control battery core in corresponding first electrokinetic cell module 21 and first electrokinetic cell module 21 and carry out energetic interaction.
It should be noted that, in the present embodiment, second electrokinetic cell module 22 ... n-th electrokinetic cell module 2n is identical with first electrokinetic cell module 21, second CSC32 ... n-th CSC3n is identical with first CSC31, and the annexation between each electrokinetic cell module and corresponding CSC and principle of work please refer to noted earlier, illustrate no longer one by one at this.
Fig. 3 is the circuit diagram of the power battery management system of first electrokinetic cell module 21 correspondence in Fig. 2, as shown in Figure 3, the input end of the one DC/DC311 is connected with the both positive and negative polarity of first electrokinetic cell module 21, mouth is connected with the MUC314 in first CSC31, and a DC/DC311 powers also to first CSC31 from the power taking of first electrokinetic cell module 21.The input end of the 2nd DC/DC312 is also connected with the both positive and negative polarity of first electrokinetic cell module 21, mouth is connected by the first K switch p and BMU1,2nd DC/DC312 is from the power taking of first electrokinetic cell module 21 and power to BMU1, and the mouth of BMU1 is respectively at connections such as CSU4, IMM5 and Load6, make the normally work such as CSU4, IMM5 and Load6, therefore the power supply of CSU4, IMM5 and Load6 etc. also comes from first electrokinetic cell module 21.One end of 3rd DC/DC313 is connected with the both positive and negative polarity of each battery core CellI7 in first electrokinetic cell module 21 by the second switch Kb that each battery core CellI7 is corresponding, the other end is connected with first electrokinetic cell module 21, thus to being greater than the battery core CellI7 of default battery core charge value, discharge, and electricity is transferred to first electrokinetic cell module 21, concrete discharge process, as the direction in Fig. 3 indicated by solid arrow; Or the 3rd DC/DC313 is from the power taking of first electrokinetic cell module 21, the battery core CellI7 being less than default battery core charge value is charged, the electricity of first electrokinetic cell module 21 is made to transfer to the battery core CellI7 being less than default battery core charge value, concrete process of charging, as dotted arrow indicated direction in Fig. 3.
It should be noted that, the first K switch p and second switch Kb is controlled by the MCU316 in first CSC31, thus controls the 2nd DC/DC312 and the 3rd DC/DC313 work or do not work.
Particularly, BMU1 can be provided with default battery core charge value, after first CSC31 normally works, BMU1 controls the electricity that first CSC31 gathers each battery core CellI7 in first electrokinetic cell module 21, and reports BMU1; Then BMU1 judges the electricity of each battery core CellI7 and the magnitude relationship of default battery core charge value.When the electricity that there is battery core CellI7 is greater than default battery core charge value, BMU1 is to first CSC31 sending controling instruction, the second switch Kb answered by the MCU314 control closed pair in first CSC31 after first CSC31 receives instruction, the electricity being greater than the battery core CellI7 of default battery core charge value shifts to first electrokinetic cell module 21 via the 3rd DC/DC313, when the electricity that there is battery core CellI7 is less than default battery core charge value, then the electricity of first electrokinetic cell module 21 shifts to the battery core CellI7 being less than default battery core charge value via the 3rd DC/DC313.
It should be noted that, the circuit diagram of the power battery management system of second electrokinetic cell module 22 correspondence ... the circuit diagram of the power battery management system that the circuit diagram of the power battery management system that the n-th electrokinetic cell module 2n is corresponding is corresponding with first electrokinetic cell module 21 is identical, its annexation and principle of work please refer to noted earlier, illustrate no longer one by one at this.
The power battery management system of the present embodiment, by arranging a DC/DC, the 2nd DC/DC and the 3rd DC/DC in each CSC, each electrokinetic cell module can be made as the sole source of BMS system, simultaneously, when each electrokinetic cell module kind exist battery core voltage be greater than or less than default battery core charge value time, the electricity achieved between battery core and corresponding electrokinetic cell module shifts, and balances the electricity of each battery core in electrokinetic cell module, improves the performance of electrokinetic cell module.Adopt the technical scheme of the present embodiment to reduce EV volume and weight, and decrease the cost of EV, improve the service life of electrokinetic cell module simultaneously.
Fig. 4 is the structural representation of the embodiment of the electrokinetic cell bag of power battery management system of the present invention, and as shown in Figure 4, Packx represents an arbitrary electrokinetic cell bag, and Packx can adopt power battery management system embodiment illustrated in fig. 2.As shown in Figure 4, the electrokinetic cell bag PackxBMU1 of the present embodiment, first electrokinetic cell module, 21, second electrokinetic cell module 22 ... n-th electrokinetic cell module 2n, and first CSC31, second CSC32 that each electrokinetic cell module is corresponding ..., the compositions such as n-th CSC3n, CSU4, IMM5, Load6.Detailed operation, please refer to relevant record embodiment illustrated in fig. 2, does not repeat them here.
In the power battery management system of above-described embodiment, only how the battery core in electrokinetic cell module is powered and be illustrated, and in BMS system, a Pack is in series by multiple electrokinetic cell module, the capacity of each electrokinetic cell module is also different, the words do not controlled, the electrokinetic cell module overdischarge that capacity is lower can be caused equally during electric discharge, electrokinetic cell module overcharge that in Pack, capacity is lower can be caused during charging and then process of charging is terminated in advance, affect the performance of electrokinetic cell module, shorten the service life of electrokinetic cell module.For solving the problem, present invention also offers following power battery management system.
Fig. 5 is the structural representation of an embodiment again of power battery management system of the present invention, as shown in Figure 5, the power battery management system of the present embodiment is described in further detail further in the power battery management system of this enforcement on basis embodiment illustrated in fig. 2, first CSC31 also comprises the first acquisition module 315 and the first communication module 316, BMU1 comprises the second communication module 11; First communication module 316 is connected with the second communication module 11 communication, and the first communication module 316 is also connected with the first acquisition module 315.First acquisition module 315 is for gathering the parameter information of first corresponding electrokinetic cell module 21, and this information comprises the open circuit voltage (OpenCircuitVoltage of first electrokinetic cell module 21; And the electricity of each battery core OCV).Because first CSC31 is connected with the both positive and negative polarity of each battery core in first electrokinetic cell module 21 and the both positive and negative polarity of first electrokinetic cell module 21 respectively, so the first acquisition module 315 can gather the parameter information of first electrokinetic cell module 21, as electricity, the temperature and power consumption electric current etc. of OCV, each battery core.
After the first acquisition module 315 gathers the parameter information of first electrokinetic cell module 21, the first communication module 316 for the information that gets parms from the first acquisition module 315, and sends parameter information to the second communication module 11; Second communication module 11, for receiving this parameter information, realizes the service condition of BMU1 to first electrokinetic cell module 21 and monitors, and balances the electricity of each battery core in first electrokinetic cell module 21, prevents improper use first electrokinetic cell module 21.Wherein the first communication module 316 and the second communication module 11 can adopt any communication modes, and the most frequently used communication modes is controller local area network (ControllerAreaNetwork; CAN) communication.
It should be noted that, in the present embodiment, second electrokinetic cell module 22 ... n-th electrokinetic cell module 2n is identical with first electrokinetic cell module 21, second CSC32 ... n-th CSC3n is identical with first CSC31, and the annexation between the annexation between each electrokinetic cell module and corresponding CSC and principle of work and each CSC and BMU1 and principle of work please refer to noted earlier, illustrate no longer one by one at this.
Dynamic BMU1 in the power battery management system of the present embodiment also comprises memory module 12, acquisition module 13, comparison module 14, computing module 15, second acquisition module 16 and control module 17;
Memory module 12 is for storing OCV and the dump energy (StateofCharge of each electrokinetic cell module; SoC) mapping table; Acquisition module 13 is connected with memory module 12 and the second communication module 11 respectively, OCV in the parameter information that acquisition module 13 receives for the mapping table that stores according to memory module 12 and the second communication module 11, obtains the size of the SoC of each electrokinetic cell module; Comparison module 14 is connected with acquisition module 13, the size of the SoC of each electrokinetic cell module of comparison module 14 for obtaining according to acquisition module 13, and the size of the SoC of more each electrokinetic cell module, obtains minimum SoC; Computing module 15 is connected with comparison module 14, and computing module 15 calculates the SoC of other each electrokinetic cell module and the difference of minimum SoC for the minimum SoC obtained according to comparison module 14; And according to the generating capacity of each electrokinetic cell module of each mathematic interpolation.
Comparison module 14 is also for sorting from big to small according to generating capacity to each electrokinetic cell module; Second acquisition module 16 is for gathering the size of the received current of each BMU1; Computing module 15 also gathers mould 16 pieces and is connected with second, computing module 15, also for obtaining the size of the received current of BMU1, calculates the number M of the electrokinetic cell module needing generating; Acquisition module 13 is also connected with computing module 15, acquisition module 13 also for calculating M electrokinetic cell module 2 of gained and comparison module 14 according to computing module 15 to each electrokinetic cell module according to can generating capacity ranking results from big to small, being chosen M+1 electrokinetic cell module from big to small successively and being powered from each electrokinetic cell module after the descending sequence of generating capacity; Control module 17 is connected with the second communication module 11 and acquisition module 13 respectively, for M+1 the electrokinetic cell module chosen according to acquisition module 13, sends instruction control M+1 electrokinetic cell module power by the second communication module 11.
For each electrokinetic cell module, its OCV and SoC is one to one, the relation table of correspondence can be stored in BMU1 in advance.When CSC gathers the OCV of corresponding electrokinetic cell module, and after being sent to BMU1, BMU1 can table look-up the size of the SoC obtaining each electrokinetic cell module, is designated as SoC (x); The SoC (x) obtained is compared and obtains minimum SoC (x), be designated as SoC (x) min; Utilize mathematical formulae to obtain the SoC (x) of other each electrokinetic cell module and the difference of SoC (x) min, be designated as Δ SoC (x); Δ SoC (x) is multiplied by the nominal capacity of each electrokinetic cell module, obtains the generating capacity of each electrokinetic cell module, be designated as Cap (x); The Cap (x) obtained is sorted from big to small.
The power battery management system of the present embodiment, the size of the power consumption electric current of part beyond each CSC can be gathered by the second acquisition module 16, the i.e. size of the received current of BMU1, and the hardware design characteristic of the 2nd DC/DC determines constant output current when the 2nd DC/DC band carries, and finally BMU1 is powered, so with the received current of the BMU1 outgoing current divided by the 2nd DC/DC, the number of the 2nd DC/DC needed can be obtained, and the corresponding electrokinetic cell module of each 2nd DC/DC, the number M of the electrokinetic cell module needing generating can be obtained further.In order to ensure that power battery management system normally runs, the generating capacity of the electrokinetic cell module chosen should be greater than the total power generating capacity of needs, therefore after calculating M, should power by control M+1 electrokinetic cell module.
Particularly, M+1 the electrokinetic cell module that control module 17 is chosen according to acquisition module 13 generates control command, by the second communication module 11 to CSC sending controling instruction corresponding to M+1 electrokinetic cell module, controlled to open or close the first K switch p by MCU after CSC receives signal, when after M+1 the electrokinetic cell module that acquisition module 13 is chosen, MCU in the CSC that M+1 electrokinetic cell module is corresponding controls closedown first K switch p and makes the 2nd DC/DC work, realize the 2nd DC/DC from the power taking of M+1 electrokinetic cell module, and the Load (CSU to power battery management system, IMM) power.
The power battery management system of the present embodiment, the OCV in corresponding electrokinetic cell module is gathered by the first acquisition module in each CSC, and be sent to BMU1, M the electrokinetic cell module needing generating is calculated by BMU1, and from big to small control M+1 electrokinetic cell module to power supplies such as CSC31 and BMU1, achieve the electrokinetic cell module preferential discharge to higher generating capacity, balance the generating capacity between electrokinetic cell module.Adopt the technical scheme of the present embodiment can improve the performance of electrokinetic cell module and the service life of electrokinetic cell module.
Further, in the power battery management system of above-described embodiment, BMU1 can also comprise timer 18.Timer 18 is for the setting-up time cycle.When the power-on time of M+1 electrokinetic cell module reaches the time cycle, timer 18 triggers acquisition module 13 and starts, and the quantity of the electrokinetic cell module needing generating is redefined by acquisition module 13, comparison module 14 and computing module 15, in detail can with reference to the relevant record of acquisition module in above-described embodiment 13, comparison module 14 and computing module 15, realize the quantity redefining the electrokinetic cell module needing generating, do not repeat them here.
In order to ensure that the generating capacity of all electrokinetic cell modules is 0, control module 17 can not only be powered by control M+1 electrokinetic cell module, after needing power supply a period of time, as 10min, 15min or 20min etc., BMU1 obtains the SoC of each electrokinetic cell module more again, again the size of more each SoC, redefine generating capacity and need the quantity of the electrokinetic cell module generated electricity, all the time the electrokinetic cell module controlling generating capacity higher first generates electricity, until the generating capacity of all electrokinetic cell modules is 0.
But when the generating capacity of all electrokinetic cell modules is 0, the actual SoC not representing electrokinetic cell module is 0, now only represents that the SoC of all electrokinetic cell modules is identical, if desired continue as BMS when powering, then continue power supply.Often cross the electrokinetic cell module quantity that one-period then recalculates power supply, until the actual SoC of electrokinetic cell module is 0, now represent that the electricity of all electrokinetic cell modules discharges, need charging.
It should be noted that, can using SoC (x) min that chooses all the time as with reference to value, but during Cap (x)=0, and continue generating, the Cap (x) obtained is negative value, now needs to take absolute value, then redefines the quantity of the electrokinetic cell module needing power supply.In the special occasion, before as closed in just power on initial stage or outside Control, all electrokinetic cell modules can be controlled and power.After time delay certain hour, get back to above-mentioned normal control logic.
Fig. 6 is the diagram of circuit of an embodiment of the method for controlling power supply of power battery management system of the present invention, as shown in Figure 6, the battery-powered method of power electric of this enforcement is specially the method for supplying power to of power battery management system embodiment illustrated in fig. 4, and the battery-powered method of power electric of the present embodiment can comprise the steps:
101, according to the mapping table of OCV and the SoC of each electrokinetic cell module, the size of the dump energy of each electrokinetic cell module is obtained;
For electrokinetic cell module, its OCV and SoC is one to one, the relation table of correspondence can be stored in BMU in advance.When CSC gathers the OCV of each electrokinetic cell module, and be sent to BMU, BMU can table look-up the size of the SoC obtaining each electrokinetic cell module, is designated as SoC (x).
102, the size of the SoC of more each electrokinetic cell module, obtains minimum SoC;
The SoC (x) obtained is compared and obtains minimum SoC (x), be designated as SoC (x) min.
103, according to minimum SoC, the SoC of other each electrokinetic cell module and the difference of minimum SoC is calculated;
Utilize mathematical formulae to obtain the SoC (x) of other each electrokinetic cell module and the difference of SoC (x) min, be designated as Δ SoC (x).
104, according to the generating capacity of the SoC of other each electrokinetic cell module and each electrokinetic cell module of the mathematic interpolation of minimum SoC;
Δ SoC (x) is multiplied by the nominal capacity of battery core total in each electrokinetic cell module, obtains the generating capacity of each electrokinetic cell module, be designated as Cap (x).
105, according to the generating capacity of each electrokinetic cell module, each electrokinetic cell module is sorted from big to small according to generating capacity;
The Cap (x) obtained is sorted from big to small.
106, the size of the received current of each described electrokinetic cell administrative unit is gathered;
107, obtain the size of the received current of each described electrokinetic cell administrative unit, calculate the number M of the electrokinetic cell module needing generating;
Power battery management system can by gathering the size of the power consumption electric current of part beyond CSC, the i.e. size of the received current of BMU, and the current constant that electrokinetic cell module is exported by the 2nd DC/DC, so with the received current of the BMU outgoing current divided by the 2nd DC/DC, the number of the 2nd DC/DC needed can be obtained, and the corresponding electrokinetic cell module of each 2nd DC/DC, the number M of the electrokinetic cell module needing generating can be obtained further.108, according to M the electrokinetic cell module calculating gained, from each electrokinetic cell module after the descending sequence of generating capacity, choose M+1 electrokinetic cell module from big to small successively power;
109, control M+1 electrokinetic cell module is powered.
In order to ensure that BMS system is normally run, total generating electricity of the electrokinetic cell module chosen should be greater than total power consumption electricity of part beyond CSC, therefore after calculating M, should power by control M+1 electrokinetic cell module.
The battery-powered method of control power electric of the present embodiment, by gathering the OCV of each electrokinetic cell module, and be sent to BMU, the electrokinetic cell module number M needing generating is calculated by BMU, and according to the electrokinetic cell module of sequence control M+1 from big to small, the parts beyond CSC are powered, achieve the electrokinetic cell module preferential discharge to higher generating capacity, balance the generating capacity between electrokinetic cell module.Adopt the technical scheme of the present embodiment can improve the performance of electrokinetic cell module and the service life of electrokinetic cell module.
Further, the battery-powered method of control power electric of above-described embodiment is described, and after control M+1 electrokinetic cell module is powered, the method also comprises:
When the power-on time of M+1 electrokinetic cell module reaches preset time period, redefine the quantity of the electrokinetic cell module needing generating.
Preset time period sets in advance, and when the power-on time of M+1 electrokinetic cell module reaches the time cycle, BMU recalculates Cap (x), upgrades Cap (x), and redefines the quantity of the electrokinetic cell module needing generating.Can record with reference to step 101-108 in above-described embodiment is relevant in detail, not repeat them here.
When Cap (x)=0, the actual SoC not representing electrokinetic cell module is 0, now only represents that the SoC of all electrokinetic cell modules is identical, if desired continues as BMS when powering, then continue merit and power.Often cross the electrokinetic cell module quantity that one-period then recalculates power supply, until the SoC of electrokinetic cell module is 0, now represent that the electricity of all electrokinetic cell modules discharges, need charging.
It should be noted that, can using SoC (x) min that chooses all the time as with reference to value, but during Cap (x)=0, and continue generating, the Cap (x) obtained is negative value, now needs to take absolute value, then redefines the quantity of the electrokinetic cell module needing power supply.In the special occasion, before as closed in just power on initial stage or outside Control, all electrokinetic cell modules can be controlled and power.After time delay certain hour, get back to normal control logic.
Fig. 7 is the diagram of circuit of another embodiment of the method for controlling power supply of power battery management system of the present invention, as shown in Figure 7, the battery-powered method of power electric of this enforcement is specially the power supply of power battery management system embodiment illustrated in fig. 2, and the battery-powered method of power electric of the present embodiment can comprise the steps:
201, the electricity of each battery core in each electrokinetic cell module is gathered;
202, judge whether the electricity of each battery core is greater than default battery core charge value;
203, when the electricity of battery core is greater than default battery core charge value, the electricity controlling corresponding battery core shifts to the electrokinetic cell module of correspondence;
204, when the electricity of battery core is less than default battery core charge value, the electricity controlling corresponding electrokinetic cell module shifts to the battery core of correspondence.
Particularly, BMU1 can be provided with default battery core charge value, after CSC normally works, BMU1 allows CSC gather the electricity of each battery core in Module, and reports BMU1; Then BMU1 judges whether the electricity of each battery core is greater than default battery core charge value.When the electricity that there is battery core is greater than default battery core charge value, BMU transmits control signal to CSC, the second switch of being answered by the MCU control closed pair in CSC after CSC receives signal, the battery core electricity being greater than default battery core charge value shifts to electrokinetic cell module via the 3rd DC/DC, when the electricity that there is battery core is less than default battery core charge value, the electricity of power battery modules shifts to the battery core being less than default battery core charge value via the 3rd DC/DC.
The battery-powered method of power electric of the present embodiment, by gathering the electricity of each battery core in each electrokinetic cell module, when there is battery core voltage in each electrokinetic cell module and being greater than or less than default battery core charge value, the electricity achieved between battery core and electrokinetic cell module shifts, balance the electricity of each battery core in electrokinetic cell module, improve the performance of electrokinetic cell module.Adopt the technical scheme of the present embodiment can improve the performance of electrokinetic cell module and the service life of electrokinetic cell module.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in computing machine or read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a power battery management system, is characterized in that, described system comprises electrokinetic cell monitoring unit corresponding to electrokinetic cell administrative unit, multiple electrokinetic cell module and each described electrokinetic cell module;
Described electrokinetic cell monitoring unit comprises the first DC decompression power module and the second DC decompression power module; Described first DC decompression power module is all connected with the both positive and negative polarity of corresponding described electrokinetic cell module with the input end of described second DC decompression power module, power taking from described electrokinetic cell module;
The mouth of described first DC decompression power module connects with the input end of corresponding described electrokinetic cell monitoring unit, powers for giving described electrokinetic cell monitoring unit; The mouth of described second DC decompression power module is connected with the input end of described electrokinetic cell administrative unit, powers for giving described electrokinetic cell administrative unit.
2. system according to claim 1, it is characterized in that, described electrokinetic cell monitoring unit also comprises the 3rd DC decompression power module, one end of described 3rd DC decompression power module connects with the both positive and negative polarity of each battery core in corresponding described electrokinetic cell module, and the other end connects with the both positive and negative polarity of corresponding described electrokinetic cell module; When the charge value of described battery core is greater than default battery core charge value, electricity from the described battery core power taking of correspondence, and is transferred to corresponding described electrokinetic cell module by described 3rd DC decompression power module; When the charge value of described battery core is less than described default battery core charge value, the power taking from the described electrokinetic cell module of correspondence of described 3rd DC decompression power module, and electricity is transferred to corresponding described battery core.
3. system according to claim 2, it is characterized in that, described electrokinetic cell monitoring unit also comprises the first switch, described first switch-linear hybrid is between described second DC decompression power module and described electrokinetic cell administrative unit, described first switch, powers for controlling electrokinetic cell administrative unit described in described second DC decompression electric power source pair of module.
4. system according to claim 3, it is characterized in that, described electrokinetic cell monitoring unit also comprises the second switch corresponding with each described battery core, each described second switch is arranged between described 3rd DC decompression power module and corresponding described battery core, described second switch, carries out energetic interaction for controlling battery core in corresponding described electrokinetic cell module and described electrokinetic cell module.
5. system according to claim 4, is characterized in that, described electrokinetic cell monitoring unit also comprises the first acquisition module; Described first acquisition module is for gathering the parameter information of corresponding described electrokinetic cell module, and described parameter information comprises the open circuit voltage of described electrokinetic cell module and the electricity of each described battery core.
6. system according to claim 5, is characterized in that, described electrokinetic cell monitoring unit also comprises the first communication module, and described electrokinetic cell administrative unit comprises the second communication module, and described first communication module is connected with described second communication module communication; Described first communication module is also connected with described first acquisition module;
Described first communication module, for obtaining described parameter information from described acquisition module, and sends described parameter information to described second communication module; Described second communication module, for receiving described parameter information.
7. system according to claim 6, is characterized in that, described electrokinetic cell administrative unit also comprises memory module, acquisition module, comparison module, computing module, the second acquisition module and control module;
Described memory module, for storing each described open circuit voltage of electrokinetic cell module and the mapping table of dump energy;
Described acquisition module, be connected with described memory module and described second communication module respectively, for the described open circuit voltage in the described parameter information that the described mapping table that stores according to described memory module and described second communication module receive, obtain the size of the described dump energy of each described electrokinetic cell module;
Described comparison module, be connected with described acquisition module, for the size of the described dump energy of each described electrokinetic cell module obtained according to described acquisition module, the size of the described dump energy of more each described electrokinetic cell module, obtains minimum dump energy;
Described computing module, is connected with described comparison module, for the described minimum dump energy obtained according to described comparison module, calculates the described dump energy of other each described electrokinetic cell module and the difference of described minimum dump energy; And according to the generating capacity of each described electrokinetic cell module of described mathematic interpolation;
Described comparison module, also for sorting from big to small according to described generating capacity to each described electrokinetic cell module;
Described second acquisition module, for gathering the size of the received current of each described electrokinetic cell administrative unit;
Described computing module, is also connected with described second acquisition module, also for obtaining the size of the described received current of described electrokinetic cell administrative unit, calculates the number M of the described electrokinetic cell module needing generating;
Described acquisition module, also be connected with described computing module, also for calculating described M electrokinetic cell module of gained and described comparison module according to described computing module to each described electrokinetic cell module according to described generating capacity ranking results from big to small, from each described electrokinetic cell module after the descending sequence of described generating capacity, choosing M+1 electrokinetic cell module from big to small successively power;
Described control module, be connected with described second communication module and described acquisition module respectively, for described M+1 the electrokinetic cell module chosen according to described acquisition module, send instruction by described second communication module, control described M+1 electrokinetic cell module and power.
8. system according to claim 7, is characterized in that, described electrokinetic cell administrative unit also comprises timer; Described timer, for the setting-up time cycle; When the power-on time of described M+1 electrokinetic cell module reaches the described time cycle, described timer triggers described acquisition module and starts, and redefines the quantity of the described electrokinetic cell module needing generating by described acquisition module, described comparison module and described computing module.
9. a method for controlling power supply for the power battery management system as described in as arbitrary in claim 1-8, it is characterized in that, described method comprises:
According to each open circuit voltage of electrokinetic cell module and the mapping table of dump energy, obtain the size of the dump energy of each described electrokinetic cell module;
The size of the described dump energy of more each described electrokinetic cell module, obtains minimum dump energy;
According to described minimum dump energy, calculate the described dump energy of other each described electrokinetic cell module and the difference of described minimum dump energy;
According to the generating capacity of each described electrokinetic cell module of described mathematic interpolation;
According to the described generating capacity of each described electrokinetic cell module, each described electrokinetic cell module is sorted from big to small according to described generating capacity;
Gather the size of the received current of each described electrokinetic cell administrative unit;
Obtain the size of the described received current of each described electrokinetic cell administrative unit, calculate the number M of the described electrokinetic cell module needing generating;
According to described M the electrokinetic cell module calculating gained, from each described electrokinetic cell module after the descending sequence of described generating capacity, choose M+1 electrokinetic cell module from big to small successively power;
Control described M+1 electrokinetic cell module to power.
10. method according to claim 9, is characterized in that, control after described M+1 electrokinetic cell module power, described method also comprises:
When the power-on time of described M+1 electrokinetic cell module reaches preset time period, redefine the quantity of the described electrokinetic cell module needing generating.
11. according in the arbitrary described method of claim 9 or 10, and it is characterized in that, the method for controlling power supply adopted in each described electrokinetic cell module, comprising:
Gather the electricity of each battery core in each described electrokinetic cell module;
Judge whether the electricity of each described battery core is greater than default battery core charge value;
When the electricity of described battery core is greater than described default battery core charge value, control the described electrokinetic cell module transfer of electricity to correspondence of corresponding described battery core.
When the electricity of described battery core is less than described default battery core charge value, control the described battery core transfer of electricity to correspondence of corresponding described electrokinetic cell module.
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