CN102522787A - Battery management system - Google Patents
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- CN102522787A CN102522787A CN2011103951467A CN201110395146A CN102522787A CN 102522787 A CN102522787 A CN 102522787A CN 2011103951467 A CN2011103951467 A CN 2011103951467A CN 201110395146 A CN201110395146 A CN 201110395146A CN 102522787 A CN102522787 A CN 102522787A
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Abstract
The invention discloses a battery management system, which comprises a plurality of battery modules connected in series, a primary/secondary direct current (DC)/DC converter, an output DC/DC converter and a controller, wherein the controller can determine a specific battery unit to be charged in the battery management system, and control the output DC/DC converter to output the electric energy of at least one battery unit to the secondary DC/DC converter to further charge the specific battery unit. Therefore, the battery unit or battery module to be charged can be charged without outputting the electric energy of all battery units by the primary DC/DC converter, time for electric energy balancing is further reduced, and system efficiency is improved.
Description
Technical field
The invention belongs to field of batteries, be specifically related to a kind of battery management system.
Background technology
Battery management system is responsible for calculating, the battery protection of battery electric quantity in the battery pack usually, the signal communication that electric quantity balancing control between battery and battery management system are inside and outside etc.In the prior art, generally use the product of battery, the battery management system of all need arranging in pairs or groups is controlled.
Because battery is difficult to guarantee to have homogeneity completely in manufacture process, can have the difference of charge or discharge characteristic between each series connected battery unit.Therefore, when using the battery pack of series-connected cell unit, can there be such problem: during charging, in the same battery pack,, also still exist some battery unit not reach capacity as yet even some battery unit is overcharged; Again or when discharge, in the same battery pack, some battery unit is discharge fully as yet, but still some battery unit is by over-discharge can.In addition, if battery unit for a long time by over-discharge can/charging, remarkable deterioration may occur in the material that constitutes battery unit, make the characteristic of battery unit dissimilate, and this deterioration is one of reason of aggravation battery unit differences.
So solve the problems referred to above through the electric quantity balancing function that the battery cell management system is provided in the prior art.
Existing electric quantity balancing method mainly contains two kinds, and wherein a kind of is the passive type electric quantity balancing, is about to electric weight unnecessary in the battery unit and dissipates heat with the mode of resistance, but only can when charging, carry out.Another kind is active electric weight balance; The mode that it adopts energy to shift; Unnecessary electric weight in the battery pack is transferred in the not enough battery unit of electric weight, and can both be carried out when can and not work, thereby satisfy the needs of the more susceptible condition of battery pack in battery charge, discharge.
In the active electric weight balance of prior art, needed the battery unit of balance to charge after adopting the DC/DC transducer with the voltage transitions of all battery units in the battery pack, need more equilibration time usually, efficient is lower.
Summary of the invention
The object of the present invention is to provide a kind of battery management system, it can reduce the needed time of battery management system electric energy balance, improves system effectiveness.
For realizing the foregoing invention purpose, the present invention provides a kind of battery management system, and this battery management system comprises:
Some battery modules of connecting each other, each battery module comprises some battery units of mutual series connection;
First order DC/DC transducer is used to obtain the total voltage of said some battery modules, and exports first output voltage that is lower than said total voltage;
At least one output DC/DC transducer is used for obtaining output from least one battery unit of respective battery modules, and exports second output voltage;
Some second level DC/DC transducer; With said corresponding connection of some battery modules; Be used to obtain the output of said first order DC/DC transducer or the output of said at least one output DC/DC transducer, and selectively output current gives particular battery unit in the respective battery modules to charge;
Controller, it is used for the said particular battery unit of confirming that institute will charge, and determine whether to adopt said at least one export DC/DC transducer and come output current to give second level DC/DC transducer.
As further improvement of the present invention, said second output voltage is higher than said first output voltage.
As further improvement of the present invention, the output that said at least one output DC/DC transducer is used for obtaining all battery units of respective battery modules.
As further improvement of the present invention, battery management system also comprises the switching circuit that is connected between each second level DC/DC transducer and the corresponding battery module; Said controller also is used between said particular battery unit and corresponding second level DC/DC transducer, setting up electrical path through controlling said switching circuit.
As further improvement of the present invention; Said switching circuit comprise with respective battery modules in the corresponding some switch matrix of said some battery units, said controller is selected particular battery unit and corresponding second level DC/DC transducer electrical communication through opening and turn-offing of control switch matrix.
As further improvement of the present invention, said controller also is used for, and when definite particular battery unit is all battery units in the respective battery modules, opens in said some switch matrix successively, turn-offs other simultaneously.
As further improvement of the present invention; Said controller also is used to obtain the voltage signal of said some battery units, and confirms the said particular battery unit of needs charging and determine whether to open said at least one output DC/DC transducer electric energy is provided according to said voltage signal.
As further improvement of the present invention, said first order DC/DC transducer and said at least one output DC/DC transducer parallel connection are provided with.
As further improvement of the present invention; Battery management system also comprises the electrical storage device that is set together with said first order DC/DC transducer; Being used to store the electric energy of first order DC/DC transducer output, and replaceable first order DC/DC transducer supplies power to said some second level DC/DC transducer.
As further improvement of the present invention, battery management system also comprises the switch in the electrical path that is arranged on some battery modules and first order DC/DC transducer.
The invention has the beneficial effects as follows: a kind of battery management system is provided, its adopted first order DC/DC transducer, output DC/DC transducer cooperate the output electric energy to the second level DC/DC transducer, and and then the particular battery unit charged.And preferentially; Controller can be controlled output DC/DC transducer will have battery unit or the battery module of the direct output current of battery module of higher electric weight to the additional electric weight of needs; So just can all need the electric energy output of all battery units be given through first order DC/DC transducer needs the battery unit or the battery module of charging to charge; Thereby reduced the needed time of electric energy balance, improved system effectiveness.
Description of drawings
Fig. 1 is the circuit theory schematic block diagram of an embodiment of battery management system of the present invention;
Fig. 2 is the circuit theory schematic block diagram of the another embodiment of battery management system of the present invention;
Fig. 3 is the circuit diagram in the embodiment of battery management system middle controller of the present invention;
Fig. 4 is the circuit diagram in the embodiment of voltage detection module in the battery management system of the present invention;
Fig. 5 is the circuit diagram in the embodiment of DC/DC transducer in the second level in the battery management system of the present invention;
Fig. 6 is the circuit diagram in the embodiment of output DC/DC transducer in the battery management system of the present invention;
Fig. 7 is the circuit diagram in the embodiment of light isolation module in the battery management system of the present invention;
Fig. 8 is the circuit diagram in the embodiment of switch module in the battery management system of the present invention;
Fig. 9 is the schematic flow sheet that in battery management system one embodiment of the present invention the particular battery unit is carried out balance.
Embodiment
Below will combine each execution mode shown in the drawings to describe the present invention.But these execution modes do not limit the present invention, and the conversion on the structure that those of ordinary skill in the art makes according to these execution modes, method or the function all is included in protection scope of the present invention.
In embodiments more of the present invention; Battery pack comprises some mutual series connected battery unit, and in other embodiments, some battery units can be divided into some battery modules; The quantity of the battery unit that different battery modules comprises can be identical, also can be inequality.
Shown in Figure 1 is first execution mode of battery management system of the present invention.Battery management system comprises some battery units 52, voltage detection module 30, active balancing module 20, controller 10 and a pair of signal bus CH_P, the CH_N of mutual series connection.In this execution mode, these some battery units constitute a battery module, connect with other battery module then.Certainly, in other execution mode, these some battery units also can directly constitute a battery pack.
Signal bus CH_P, CH_N are set to selectively to electrically connect with the positive and negative level of one of some battery units 52, and this signal bus CH_P, CH_N also electrically connect with voltage detection module 30 and active balancing module 20 simultaneously.Like this, the current path that signal bus CH_P, CH_N just provide voltage detection module 30 to detect battery units 52 voltages simultaneously, and active balancing module 20 current path of charging for the particular battery unit.
Battery management system also comprises the switch module 41 that is connected between some battery units 52 and the controller 10.It comprises the some switch matrix 401,402 corresponding with above-mentioned some battery unit 52 ... 40n.Controller 10 can through in the control switch module 41 with the opening and turn-off and select signal bus CH_P, CH_N and corresponding battery unit electrical communication of battery unit 52 corresponding switch matrixes.In this execution mode, owing to the voltage detecting process and the active balancing process of battery unit 52 are accomplished respectively in the different time section, so controller 10 is being worked between detection period He during the active balancing at least.
When controller 10 is operated between detection period; It needs the battery unit and signal bus CH_P, the CH_N that detect to electrically connect through switch module 41 connections, controls voltage detection module 30 is obtained this battery unit through signal bus CH_P, CH_N voltage signal simultaneously; Further, in the time of during controller 10 is operated in active balancing, it is communicated with the electrical CH_P of signal bus, CH_N through the particular battery unit that control need be recharged, and charges through 20 pairs of these particular battery unit of active balancing module.
As preferred embodiment, between detection period with an active balancing during total time length be 2 seconds, be divided into eight periods to these 2 seconds, wherein first period is used for detecting, all the other seven periods are used for active balancing.For example; In preceding 0.25 second; Controller 10 control voltage detection module 30 scan to detect voltage with 41 pairs of some battery units 52 of switch module one by one; And in ensuing 1.75 seconds, controller 10 control active balancing modules 20 need the particular battery unit of charging to charge with 41 pairs of switch modules, and so circulation.Should it is understandable that, in other embodiments, between detection period with active balancing during time span can be according to designing requirement and corresponding adjustment; In addition, detect the period except that detecting voltage, also can be used for detecting information such as electric current, battery temperature.
As well known to those of ordinary skill in the art; Switch module 41 can comprise triode, controllable silicon, relay switch or metal oxide semiconductor field effect tube (Metallic Oxide Semiconductor Field Effect transistor, common switch form such as MOSFET).In this execution mode, switch module 41 adopts MOSFET, and each switch matrix all comprises four MOSFET in the switch module 41.
Continuation as preferred embodiment, also is connected with light isolation module 60 between switch module 41 and the controller 10 with reference to Fig. 1, and this light isolation module 60 comprises and switch matrix 401,402 ... Some optical couplers that 40n is corresponding respectively.Controller 10 comes opening or closing of respective switch matrix in the control switch module 41 through optical coupler.Simultaneously, light isolation module 60 is gone back the influence of the hash of electric current generation in the maskable battery management system to controller 10, guarantees the reliable and stable of system works.In this execution mode; Active balancing module 20 also comprises the second level DC/DC transducer corresponding with battery module 51, and the active balancing electric current that comes from battery module 51 transfers to after through the DC/DC transducer step-down of this second level to be needed in the particular battery of the balance unit.
Cooperation is below introduced controller and how to be controlled the specific embodiment that four MOSFET of formation switch matrix carry out work with reference to Fig. 3 to Fig. 8.In the present embodiment, controller has adopted the CPU of the STM32 series of ARM company.MCU is at first through port one 6,25,27 output high level signal BL_ON, PWR_IN, CH01; Then, as shown in Figure 7, the port PIN3,4,13 of optical coupler 61,14 is driven conducting by the CH01 high level, makes power supply signal 12CD fan-in network CD01.As shown in Figure 8 because the grid of Q5-A, Q5-B, Q6-A, Q6-B is connected with network C D01, so switch matrix 403 conductings that Q5-A, Q5-B, Q6-A, Q6-B constituted, and make B01, B02 network respectively with signal bus CH_N, CH_P connection.As shown in Figure 5, P5, Q20 drive conducting by the PWR_IN high level, make external power source 12E, GNE give second level DC/DC transducer power supply, and this moment, second level DC/DC transducer was started working, and produced the balanced voltage about 3.5V.P7, Q22-A, Q22-B drive conducting by the BL-ON high level; Make signal bus CH_N and DC_ON connect; So far the switch matrix 403 in the switch module 41 is switched on; Thereby active balancing module 20, voltage detection module 30 are passed through to be detected by the circuit pathways of switch matrix 403 conductings the voltage of respective battery unit, and when this battery unit needs balance, it are charged.
Join Fig. 2, introduce second execution mode of battery management system of the present invention.In this execution mode, battery management system comprises battery pack 50, controller 10, active balancing module, voltage detection module, switch module, light isolation module etc. equally.But, omitted voltage detection module among Fig. 2 and switch module and light isolation module have been referred to as switching circuit 40 for the ease of explanation.In this execution mode, the active balancing module has comprised the DC/DC transition components that is used for the direct current conversion; Battery pack 50 comprises some series connected battery modules 51, and battery module 51 has comprised some series connected battery unit 52 equally.
Wherein, the DC/DC transition components comprises a first order DC/DC transducer 211, some second level DC/DC transducer 212 and some output DC/DC transducers 22.First order DC/DC transducer 211 can obtain the total voltage of some battery modules 51 in the battery pack 50 and change first output voltage that output is lower than total voltage through DC decompression; Some output DC/DC transducers 22 can obtain output by at least one battery unit 52 from corresponding battery module 51, and export second output voltage.In this execution mode, output DC/DC transducer 22 obtains output from all battery units of battery module 51.Second level DC/DC transducer 212 is set to and respective battery modules 51 corresponding connections; It can obtain the output of above-mentioned first order DC/DC transducer 211 or the output of at least one output DC/DC transducer 22, and selectively output current charges for the particular battery unit in its corresponding battery module 51.
In this execution mode; Controller 10 also obtains the voltage signal of some battery units 52 through voltage detection module; And confirm the particular battery unit of needs charging, and determine whether to open that at least one above-mentioned output DC/DC transducer 22 provides the output of specific battery module, still the output of whole battery group provides balance required electric energy according to the voltage signal that obtains.
In more concrete embodiment; 22 parallel connections are provided with first order DC/DC transducer 211 with output DC/DC transducer, and second output voltage of output DC/DC transducer 22 outputs is set to first output voltage greater than 211 outputs of first order DC/DC transducer.The purpose that is provided with like this is in order to make output DC/DC transducer can have precedence over first order DC/DC transducer 211 output electric energy.For example: first output voltage is 12V; Second level output voltage is 15V; So when controller 10 is confirmed through one or more battery modules output electric energy; The output DC/DC transducer 22 that is determined just can acquire a priority with respect to first order DC/DC transducer 211, and promptly by the required electric energy of output DC/DC transducer 22 output balances, and first order DC/DC transducer can not exported electric energy.
As preferred embodiment, the output that output DC/DC transducer 22 can obtain all battery units in the battery module corresponding with it, and through 212 pairs of particular battery unit chargings of corresponding second level DC/DC transducer.Certainly, in other embodiments, output DC/DC transducer 22 also can only obtain one or more outputs with battery unit of higher electric weight from corresponding battery module, come to charge to particular battery unit.
Preferably; In this execution mode; Battery management system also comprises with first order DC/DC transducer 211 and is connected the electrical storage device 23 that is set together; It can store the electric energy of first order DC/DC transducer 211 outputs, and can replace first order DC/DC transducer 211 to come to 212 power supplies of second level DC/DC transducer.
Be provided with switching circuit 40 between each second level DC/DC transducer 212 and the corresponding battery module, this switching circuit 40 comprise with respective battery modules in some battery unit corresponding switch matrixes 401,402 ... 40n, and optical coupler.Controller 10 is through control switch matrix 401,402 ... The opening and turn-off of 40n selects to set up the electrical path between the particular battery unit and corresponding second level DC/DC transducer 212 in the respective battery modules.Principle about controller control switch matrix specifies in the above-described embodiment, and the applicant repeats no more at this.In other embodiments; Also can charge to all battery units in the respective battery modules; In this case, all battery units in this battery module are charged in turn, promptly controller 10 is controlled one that opens in the switch matrix successively; Turn-off other simultaneously, so circulation is to accomplish charging process.
As preferred embodiment; Also be provided with switch 70 between battery pack 50 and the first order DC/DC transducer 211; Through stopcock 70; Avoiding controller 10 (cross put like battery) when stopping battery pack 50 power supply, battery pack 50 is still through first order DC/DC transducer 211 or electrical storage device 23 consumed powers, thereby influenced the useful life of battery pack.
Continuation is with reference to Fig. 2, and in fact, in this execution mode, the DC/DC transition components has two kinds of different working patterns at least.In first pattern: the DC/DC transition components receives the total voltage of all battery units 52 in some battery units (being battery pack 50), and is transferred to particular battery unit after the step-down and charges; In second pattern: the DC/DC transition components receives the voltage that adds up of part battery unit in some battery units 52, and is transferred to particular battery unit to charge through after the voltage transitions.Should be understood that the voltage that adds up of said some battery units 52 can comprise the voltage that adds up of all battery units in single or a plurality of battery modules 51 here.
As previously mentioned: when first output voltage of the first order DC/DC transducer in the DC/DC transition components 211 output during less than second output voltage of output DC/DC transducer 212 outputs; Controller 10 can be controlled the DC/DC transition components and be operated under second pattern, and one or more in this moment second level DC/DC transducer 212 are selected to obtain one or more output electric energy in some output DC/DC transducers 22.Otherwise, when controller control DC/DC transition components is worked under first pattern, the one or more output electric energy that are selected to obtain first order DC/DC transducer 211 in the second level DC/DC transducer 212.
Explain that below in conjunction with Fig. 9 10 pairs of some battery units of controller carry out an embodiment of active balancing.At first, parameter informations (step 801) such as the voltage of each battery unit or battery module, electric current, temperature in the controller 10 detection battery pack 50.Wherein the detection of voltage is comprised the magnitude of voltage that obtains single battery unit in all battery units or a plurality of battery unit (like the one or more battery modules that are made up of a plurality of battery units).
Then the parameter that obtains is carried out analysis and judgement (step 802), and determine whether need open protection, put protection, short-circuit protection, overheat protector etc. like over-charge protective, mistake.For example: the voltage parameter and the predetermined threshold range that obtain are compared,, then open over-charge protective if the magnitude of voltage that records exceeds the upper limit of this predetermined threshold range; If less than the lower limit of this predetermined threshold range, then opening, the magnitude of voltage that records put protection.In other embodiment, also can the current parameters and the predetermined threshold that obtain be compared, if the electric current that records is excessive, then open short-circuit protection; Similarly, for the temperature parameter that obtains, threshold ratio that also can be corresponding with one, if too high this threshold value that exceeds of temperature then need be opened overheat protector.
If then battery pack is judged as and need protects, then open corresponding over-charge protective and/or cross and put protection and/or short-circuit protection and/or overheat protector (step 804).In circuit, can be being connected of disconnecting external charger and battery pack, and/or break off battery pack and being connected with electric loading.
If need not protect, then whether it is needed the judgement (step 803) of active balancing entry condition to battery pack.Whether wherein, judging needs the step of balance following: at first, according to the magnitude of voltage of detected single or a plurality of each battery unit of controller, judge that whether wherein maximum voltage value is more than or equal to first voltage threshold; If, then continuing to judge whether there is the specific voltage value in the detected magnitude of voltage, so-called specific voltage value promptly is and the difference of the maximum voltage value magnitude of voltage more than or equal to second voltage threshold; If there is so-called specific voltage value, then controller control starts active balancing.
In concrete embodiment, can establish first voltage threshold is 3.45V, and second voltage threshold is 30mV.That is to say that the ceiling voltage of battery unit and exists and the difference of this ceiling voltage particular battery unit more than or equal to 30mV, the then active balancing of battery management system startup greater than 3.45V in battery pack.
In other embodiment; If the non-single battery of the object of active balancing unit; But the words of battery module; Then first voltage threshold is made as the quantity of all battery units in 3.45V * single battery module, and second voltage threshold correspondingly is made as the quantity of all battery units in 30mV * single battery module.Should be understood that this first voltage threshold and second voltage threshold can be adjusted according to the different designs needs accordingly.
Started at battery management system under the situation of relevant protection, then needed further to judge (step 805) the protection of its unlatching is whether related with equilibrium phase.That is to say that battery cell voltage is low excessively in the battery pack if the corresponding situation of this protection is, for example all is lower than 3.45V, then closes balance (step 806), epicycle analysis subsequently finishes (step 813); If this protection is the protection that corresponds to other type, then continue this battery pack is carried out whether need carrying out the condition criterion (step 803) of active balancing.
Carry out the situation of active balancing for needs, then also need analyze further the voltage of detected each battery unit.
If the part battery unit in the battery pack in one or several battery modules need carry out balance, then it is organized inner equilibrium, at this moment controller execution group inner equilibrium strategy (step 807).The charge value (step 808) that controller calculating needs the particular battery unit of balance to charge; And the forward some battery modules of the magnitude of voltage rank that adds up, and calculate successively from front to back according to the height of magnitude of voltage rank and to judge that each battery module allows the charge value of output; When the charge value accumulative total of allow output begins more than or equal to the required charge value of balance; Also just confirmed to export one or battery module of electric energy, begin the battery unit that needs balance in the battery module that needs balance charge (step 809) this moment.
In this execution mode, the size of charge value is that the power that inputs or outputs through battery unit in the special time characterizes.For example; Suppose to comprise in the battery pack battery module BM1, BM2 ... BM8; And battery module BM1, BM2 ... The ceiling voltage of battery unit is greater than 3.45V among the BM8; The difference of voltage and this ceiling voltage that 2 and 3 battery units are arranged respectively among battery module BM1 and the BM4 simultaneously is more than or equal to 30mV, and then these 3 battery units among 2 battery units of this among the BM1 and the BM4 are confirmed as the particular battery unit that need charge.Subsequently; The first five the module of magnitude of voltage rank of confirming to add up in all battery modules; Be followed successively by BM6, BM7, BM8, BM9, BM10 by rank from high to low; Then calculate the power that these five battery modules allow output successively, more than or equal to the power that needs balance, carry out active balancing subsequently until the power accumulated value that allows output.But, in other execution mode, also can come the charge value of characterizing battery unit through other physical characteristic parameters such as electric capacity, voltage, inductance; And when the battery unit that needs balance is carried out balance, also can export the power that BM6 allows output earlier,, then continue the power that output BM7 allows output if not enough, and the like, until the lowest power demand that satisfies balance.
If in the battery pack in the same battery module voltage differences of each battery unit very little, then can directly charge to this battery module, promptly it is organized a balance, equilibrium strategy (step 810) between controller execution this moment group.At this moment; The charge value (step 811) that controller calculating needs the specific battery module of balance to charge; And the forward some battery modules of the magnitude of voltage rank that adds up, and calculate successively from front to back according to the height of magnitude of voltage rank and to judge that each battery module allows the charge value of output.When the charge value accumulative total of allow output begins more than or equal to the required charge value of balance, also just confirmed to export or battery module of electric energy.The outer battery module of this moment group begins all battery units in the battery module that needs balance charge in turn (step 812).
Similarly, in concrete embodiment, suppose to comprise in the battery pack battery module BM1, BM2 ... BM8, and the voltage of each battery unit is almost consistent in the same battery module.At this moment; If battery module BM1, BM2 ... Ceiling voltage among the BM8 is greater than the quantity of all battery units in 3.45V * corresponding battery module, and exists and the voltage difference of this ceiling voltage battery module battery module more than or equal to the quantity of all battery units in 30mV * corresponding battery module.Then according to method like the group inner equilibrium policy class, the voltage height according to each battery module charges to the battery unit in the battery module that needs balance successively in turn, finishes until balance.About the detailed process of active balancing, the applicant repeats no more at this.
In other embodiments; If when judging in the battery pack the accumulated value of electric weight that all battery modules allow output all less than the required charge value of balance according to calculating; Then confirm by first order DC/DC transducer; Promptly all battery modules are exported electric energy, so that battery unit or the battery module that needs balance charged.
Technical scheme beneficial effect of the present invention is following:
The signal bus CH_P, the CH_N that electrically connect with voltage detection module 30 and active balancing module 20 have been adopted; Controller 10 can be controlled voltage detecting module 30 through signal bus CH_P, CH_N transmission voltage detection signal, and while controller 10 can also be controlled active balancing module 20 and through signal bus CH_P, CH_N particular battery unit charged.Simplified the complexity of line architecture, and and then reduced the quantity of the optical coupler that uses, reduced design and manufacture cost.
Adopted first order DC/DC transducer 211, output DC/DC transducer 22 cooperate the output electric energy to the second level DC/DC transducer 212, and and then the particular battery unit charged.And preferentially; Controller 10 can be controlled output DC/DC transducer 22 will have battery unit or the battery module of the direct output current of battery module of higher electric weight to the additional electric weight of needs; So just can all need the electric energy output of all battery units be given through first order DC/DC transducer needs the battery unit or the battery module of charging to charge; Thereby reduced the needed time of electric energy balance, improved system effectiveness.
Because battery management system has two kinds of mode of operations, i.e. first pattern: be transferred to the particular battery unit to charge after the total voltage step-down with all battery units in some battery units; With second pattern: the voltage that adds up of part battery unit in some battery units is transferred to particular battery unit to charge after voltage transitions.Battery management system can take different patterns that the particular battery unit is charged according to condition of different; And do not need always by all battery units the particular battery unit to be charged; More flexible, thus the needed time of electric energy balance reduced, and improved system effectiveness.
Through judging whether the battery unit in the battery pack exists the magnitude of voltage that is higher than first voltage threshold, and further judge whether to exist battery unit, promptly need be recharged the battery unit of balance with specific voltage value.Through the method for such active balancing, can be in time give the battery unit that the needs balance balance of charging, prevent the deterioration of material in the battery unit.And this that battery pack is carried out the method for active balancing is simple, and hardware is realized easily, has promoted system effectiveness.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and under the situation that does not deviate from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore; No matter from which point; All should regard embodiment as exemplary; And be nonrestrictive, scope of the present invention is limited accompanying claims rather than above-mentioned explanation, therefore is intended to the implication of the equivalents that drops on claim and all changes in the scope are included in the present invention.Should any Reference numeral in the claim be regarded as limit related claim.
In addition; Describing according to execution mode though should be appreciated that this specification, is not that each execution mode only comprises an independently technical scheme; This narrating mode of specification only is for clarity sake; Those skilled in the art should make specification as a whole, and the technical scheme among each embodiment also can form other execution modes that it will be appreciated by those skilled in the art that through appropriate combination.
Claims (10)
1. a battery management system is characterized in that, this battery management system comprises:
Some battery modules of connecting each other, each battery module comprises some battery units of mutual series connection;
First order DC/DC transducer is used to obtain the total voltage of said some battery modules, and exports first output voltage that is lower than said total voltage;
At least one output DC/DC transducer is used for obtaining output from least one battery unit of respective battery modules, and exports second output voltage;
Some second level DC/DC transducer; With said corresponding connection of some battery modules; Be used to obtain the output of said first order DC/DC transducer or the output of said at least one output DC/DC transducer, and selectively output current gives particular battery unit in the respective battery modules to charge;
Controller, it is used for the said particular battery unit of confirming that institute will charge, and determine whether to adopt said at least one export DC/DC transducer and come output current to give second level DC/DC transducer.
2. battery management system according to claim 1 is characterized in that: said second output voltage is higher than said first output voltage.
3. battery management system according to claim 1 is characterized in that: the output that said at least one output DC/DC transducer is used for obtaining all battery units of respective battery modules.
4. battery management system according to claim 1 is characterized in that: battery management system also comprises the switching circuit that is connected between each second level DC/DC transducer and the corresponding battery module; Said controller also is used between said particular battery unit and corresponding second level DC/DC transducer, setting up electrical path through controlling said switching circuit.
5. battery management system according to claim 4; It is characterized in that: said switching circuit comprise with respective battery modules in the corresponding some switch matrix of said some battery units, said controller is selected particular battery unit and corresponding second level DC/DC transducer electrical communication through opening and turn-offing of control switch matrix.
6. battery management system according to claim 5; It is characterized in that: said controller also is used for; When definite particular battery unit is all battery units in the respective battery modules, open in said some switch matrix successively, turn-off other simultaneously.
7. battery management system according to claim 1; It is characterized in that: said controller also is used to obtain the voltage signal of said some battery units, and confirms the said particular battery unit of needs charging and determine whether to open said at least one output DC/DC transducer electric energy is provided according to said voltage signal.
8. battery management system according to claim 1 is characterized in that: said first order DC/DC transducer and said at least one output DC/DC transducer parallel connection are provided with.
9. battery management system according to claim 1; It is characterized in that: battery management system also comprises the electrical storage device that is set together with said first order DC/DC transducer; Being used to store the electric energy of first order DC/DC transducer output, and replaceable first order DC/DC transducer supplies power to said some second level DC/DC transducer.
10. battery management system according to claim 1 is characterized in that: battery management system also comprises the switch in the electrical path that is arranged on some battery modules and first order DC/DC transducer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103951467A CN102522787A (en) | 2011-12-02 | 2011-12-02 | Battery management system |
| US13/364,154 US20130141047A1 (en) | 2011-12-02 | 2012-02-01 | Battery management system and method thereof |
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| CN2011103951467A CN102522787A (en) | 2011-12-02 | 2011-12-02 | Battery management system |
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Application publication date: 20120627 |