CN102655346A - Intelligent battery module and battery pack with automatic balance capability - Google Patents
Intelligent battery module and battery pack with automatic balance capability Download PDFInfo
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Abstract
The invention relates to an intelligent battery module, and aims to provide an intelligent battery module and a battery pack with automatic balance capability. The intelligent battery module comprises a battery monomer or a battery pack formed by one battery monomer or formed by connecting n battery monomers in series, wherein the anode and the cathode of the battery monomer or the battery pack are connected to an input end of a DC(direct current)/DC converter; two output ends of the DC/DC converter serve as intelligent battery module outputs; the intelligent battery module also comprises a control circuit; the control circuit is provided with a communication interface circuit used for providing an indication signal for the control circuit; and the control circuit regulates output voltage of the intelligent battery module on the basis of the indication signal. According to the intelligent battery module and the battery pack, external power supply and internal charge can be realized by the DC/DC converter, the series connection can be conveniently realized, the balance between the battery modules is realized, and the maximum utilization and the maximum service life of battery storage energy can be realized.
Description
Technical field
The present invention relates to a kind of intelligent battery module, the output regulatory function of particularly utilizing the intelligent battery module to have, the equilibrium between the realization battery module and the maximum use of storage power.
Background technology
In application scenarios such as new-energy automobile (electric automobile or hybrid vehicle) and energy storage, storage battery is as energy-storage units or functional unit, because its higher energy storage density and cost performance have obtained using widely.Because the voltage that single battery can provide is lower, in most cases can not satisfy the needs of practical application, so need a plurality of battery series connection or parallel connection to satisfy the requirement that system uses in many cases.Owing to there are differences between the series connected battery monomer, so the useful life of each monomer is also inequality.In series battery, there is a monomer to break down, can causes the decreased performance of whole series battery work even scrap.
Supposing has a fail battery in the battery pack, and the internal resistance of fail battery is very big, has some charging currents that the battery voltage is sharply risen a little.Equally, as long as discharge at the beginning, the battery voltage will descend rapidly.In series battery, in case a joint fail battery occurred, then the charge-discharge characteristic of whole battery group can variation.During such as charging; The battery pack terminal voltage can rise to full charging voltage very soon; Charger is judged according to the battery pack terminal voltage, thinks that battery pack has been full of electricity, does not need again it to be carried out charging operations; The situation of cause normal battery to owe to fill, fail battery overcharging further causes the deterioration of fail battery.At discharge regime, because the electric weight that whole battery group stores seldom, so soon electricity has just been given out light.In other words: the actual capacity that is used of whole battery group becomes very little because of the appearance of fail battery, can supplying time also shorten a lot.Can understand like this: the fault of most of series batteries often is to cause owing to one of them supply unit breaks down.
Therefore, aborning, to the battery pack that series connection is used, need carry out the coupling of performance, promptly the approaching battery cell of serviceability is connected as far as possible, to guarantee the life-span of battery pack.This method still has certain feasibility when series-connected cell quantity is less.But under a fairly large number of situation of series connection, can realize hardly, and the high cost that brings of the extra screening rapid rising that can bring cost.As in electric automobile, the series-connected cell monomer may reach about 100, and on the new forms of energy stored energy application, quantity is huge especially, can reach thousands of.
Therefore, how to give full play to the efficiency of battery pack, realize the equilibrium of battery, avoid the influence of single inefficacy, remain a significant challenge of these application scenarios whole battery group.
Application number is 02109341.5 patent of invention " battery shifter "; It discloses a kind of battery shifter that is used for series battery this invention; Can " battery in proper working order be connected in the battery pack; abnormal battery of will working is rejected battery pack, continues to keep the power supply of battery pack." adopt this method that fail battery is handled after; the terminal voltage of battery pack can descend; relatively be applicable among " all kinds of uninterruption power source ", but for the occasion that series connection supply unit group terminal voltage is had relatively high expectations (such as Notebook Battery etc.) and inapplicable.Application number is 03109241.1 patent of invention " a kind of battery with redundancy unit "; " having redundant battery unit in the battery pack; this circuit can excise the abnormal battery of work; through redundant battery unit is set, when the excision fail battery, still can guarantee the voltage that provides enough simultaneously " of this invention.This method can make the performance of Notebook Battery increase, but because deposited redundant battery, the volume of battery pack can increase to some extent, and redundant battery volume more at most is big more, and cost is high more, is not suitable for big capacity occasion.
Summary of the invention
The technical problem that the present invention will solve is, overcomes deficiency of the prior art, and a kind of intelligent battery module and battery pack with autobalance ability is provided.
Be the technical solution problem, solution of the present invention is:
A kind of intelligent battery module with autobalance ability is provided, comprises a battery cell, or a battery pack that is composed in series by n battery cell; The positive pole of said battery cell or battery pack and negative pole are connected to the input of a DC/DC current transformer, and two outputs of said DC/DC current transformer are exported as the intelligent battery module; Said intelligent battery module also comprises a control circuit, and this control circuit has a communication interface circuit, be used for to control circuit index signal being provided, and control circuit is regulated the output voltage of intelligent battery module based on this index signal.
Among the present invention, said index signal is at least a in the following signal: average voltage signal, average cell capacity signal, maximum voltage signal or the maximum battery capacity signal of all intelligent object internal cells in the battery pack.
Among the present invention, said DC/DC current transformer is two-way DC/DC current transformer.
Among the present invention, the output of said two-way DC/DC current transformer has an inverse parallel diode, and said diode cathode is connected to said current transformer output plus terminal, and said diode anode is connected to said current transformer output negative terminal.
Among the present invention, said two-way DC/DC current transformer is any one in the following non-isolation type current transformer: two-way BUCK current transformer, two-way BOOST current transformer, two-way BUCK-BOOST current transformer, two-way CUK current transformer, two-way SEPIC current transformer or two-way ZETA current transformer.
Further, the present invention also provides a kind of battery pack with autobalance ability, and this battery pack comprises at least 2 intelligent battery modules; Said intelligent battery module includes: a DC/DC current transformer, a control circuit, a battery cell or a battery pack that is composed in series by several battery cells; The both positive and negative polarity of battery cell or battery pack is connected to the DC/DC current transformer, and two outputs of said DC/DC current transformer are exported as the intelligent battery module; Said control circuit comprises a communication interface circuit; The communication interface circuit of each intelligent battery module interconnects through order wire; Be used to exchange the internal information of intelligent battery module; And provide index signal to the control circuit of intelligent battery inside modules separately, and control circuit is regulated intelligent battery module output voltage based on this index signal.
Among the present invention, said index signal is at least a in the following signal: average voltage signal, average cell capacity signal, maximum voltage signal or the maximum battery capacity signal of all intelligent object internal cells in the battery pack.
Among the present invention; Said DC/DC current transformer is two-way DC/DC current transformer, is in the following non-isolation type current transformer any one: two-way BUCK current transformer, two-way BOOST current transformer, two-way BUCK-BOOST current transformer, two-way CUK current transformer, two-way SEPIC current transformer or two-way ZETA current transformer.
Among the present invention, the output of said two-way DC/DC current transformer has an inverse parallel diode, and said diode cathode is connected to said current transformer output plus terminal, and said diode anode is connected to said current transformer output negative terminal.
Among the present invention, after the communication interface circuit of said each intelligent battery module interconnects through order wire, also be connected and be used to realize information exchange with the system battery administrative unit.
With respect to prior art, beneficial effect of the present invention is:
Intelligent battery module provided by the invention and battery pack; The available DC/DC current transformer that passes through is realized external power supply and internal charging; Equilibrium between convenient series connection and the realization battery module, the maximum using and the lifetime of realization battery storage energy.
Description of drawings
Fig. 1 is intelligent battery module according to the invention (BM) sketch map;
The battery pack system that Fig. 2 forms for the intelligent battery module;
Fig. 3 is the battery pack system that another kind of intelligent battery module is formed;
Fig. 4 is specific embodiment of intelligent battery inside modules block diagram;
Fig. 5 is that intelligent battery module output voltage is regulated sketch map under the discharge condition;
Fig. 6 is a specific embodiment based on the control method of voltage difference adjustment output voltage;
Fig. 7 is another specific embodiment based on the control method of voltage difference adjustment output voltage;
Fig. 8 is an intelligent object charging voltage control sketch map under the charged state;
Fig. 9 is two-way BOOST DC/DC converter circuit sketch map;
Figure 10 is two-way BUCK-BOOST DC/DC converter circuit sketch map;
Figure 11 is two-way CUK converter circuit sketch map;
Figure 12 is two-way SEPIC DC/DC converter circuit sketch map;
Figure 13 is two-way ZETADC/DC converter circuit sketch map.
Embodiment
Do further explain below in conjunction with the accompanying drawing specific embodiments of the invention.
Like what in background technology, introduced, when the series connected battery amount of monomer was bigger in the battery pack, the life-span of improving battery pack through the screening matching mode almost could.Therefore, the object of the invention is exactly in this application scenario, how to guarantee the bulk life time of battery pack, guarantees its reliability.
Shown in Figure 1 is a specific embodiment of intelligent battery module of the present invention.In an intelligent battery module, comprise limited battery cell, as 1～5, be in series each other.Like this, can make up with the good battery cell of mutual matching degree, guarantee its consistency based on certain screening technique.As noted earlier, in the less occasion of battery cell, mutual coupling is practicable.If inside only comprises a battery cell, with regard to the problem that it doesn't matter matees.The mutual series connected battery of intelligent battery inside modules through a DC-DC (DC/DC) current transformer, realizes externally power supply and charging.Like this, an intelligent battery module can be regarded an intelligent battery unit as.A plurality of intelligent battery modules are composed in series battery pack more each other, system are supplied power or energy storage, at this moment; The intelligent battery module is equivalent to a battery cell, need not to mate between the intelligent battery module, like this; To big capacity applications occasion; The problem of having avoided extensive battery coupling not realize simultaneously, can realize only systematic function just in the cards under complete match condition again.Intelligent battery module also need comprise a communication interface circuit except traditional two the output, realizes mutual data communication and information exchange, realizes the coupling and the control of system.
Further specify the system works situation of intelligent battery module under unmatched situation each other below, how to improve reliability and realize coupling and the balance between the intelligent battery module automatically with explanation.
Shown in Figure 1 is intelligent battery module (BM) sketch map.Intelligent battery inside modules shown in Figure 1 comprises some battery units connect each other (among Fig. 1 be 3 batteries series connection).The series connected battery unit externally supplies power through a DC/DC current transformer.There is a control circuit (or controller) DC/DC current transformer inside, comprises a communication interface circuit.Battery management unit (BMS) or other intelligent battery module communications in communication interface circuit and the battery pack system of forming by the intelligent battery module, exchange message.Inner control circuit is regulated output according to the battery information of the information of communication and the inside modules that collects.The DC/DC current transformer of intelligent battery inside modules shown in Figure 1, because battery charging and discharging, power needs two-way flow, is a two-way DC/DC current transformer (perhaps being called two-way DC/DC circuit).Can be various common DC/DC current transformer, like BUCK, BOOST, BUCK-BOOST, CUK, non-isolation type current transformers such as SEPIC or ZETA topology, shown in Fig. 9-13, these topological selections do not influence essence of the present invention.
Fig. 2,3 is based on the battery pack that intelligent battery module shown in Figure 1 is formed.In Fig. 2,3, each intelligent battery module is equivalent to the battery cell in the conventional batteries.Mode based on communication is different, and Fig. 2, Fig. 3 show two kinds of system configurations respectively.Among Fig. 2, the port of all intelligent battery modules interconnects, and forms communication network between the module and realizes information exchange.Like traditional CAN communication mode etc.Need to prove that the order wire COM of the communication interface circuit of each intelligent battery module interconnects in Fig. 2, having under the situation of many order wires that the corresponding order wire of expression links together.As 2, A and B link together with regard to the A that representes each module, and B links together, and in communication, this is a method for expressing commonly used.In Fig. 3, after all order wires of intelligent battery module link together,, realize the mutual of information with system battery administrative unit (BMS) based on certain communication protocol.System battery administrative unit (BMS) is the abbreviation of a kind of common equipment in battery management field.BMS generally is made up of transducer (being used for measuring voltage, electric current and temperature etc.), control unit and input/output interface.The basic functions of BMS is to gather and the operating state (voltage of battery, electric current and temperature) of monitoring battery, calculate and the capacity (SOC) of prediction battery; Carry out battery management with avoid overdischarge occurring, overcharge, the serious energy imbalance of voltage between the overheated and cell, maximally utilise battery storage ability and cycle life.Here, BMS can send to other modules with the state of each intelligent battery module that collects, and realizes the exchange of information.
Above-mentioned 2 kinds of system configurations only are different embodiment, do not influence intelligent battery module among the present invention realizes intelligent battery intermodule information through communication interface circuit exchange.To this, those skilled in the art can adopt other structure or mode to realize identical functions under the prerequisite of invention essence.
Shown in Figure 4 is an intelligent battery module detailed structure; Inner DC/DC current transformer is two-way DC/DC current transformer; Both power can two-way flow; Its output is parallel with a bypass diode DF, and the negative electrode of bypass diode DF is connected to the anode of DC/DC current transformer output, and anode is connected to the negative terminal of output.Have under the situation of output at two-way DC/DC current transformer, instead not conducting partially of bypass diode DF only provides current path under abnormal conditions.Fig. 5 is a specific embodiment of middle control circuit (also claiming controller) embodiment illustrated in fig. 4.Describe for convenient, its inner DC/DC current transformer is that example describes with a two-way BUCK converter circuit (also can be called for short circuit or topology).
(when Q1 opened, Q2 turn-offed the complementation of the switch controlling signal of Q1 and Q2 in the two-way BUCK DC/DC current transformer; Vice versa).In practical application, common for preventing Q1/Q2 because device imperfect (open shutoffs and need certain hour), (be the Q1 shutoff, a bit of time such as Q2 is open-minded again between both switch controlling signals of complementation, to insert a bit of Dead Time usually; Q2 turn-offs, and a bit of time such as Q1 is open-minded again), this Dead Time is very short usually, does not influence its complementary essence, and the Dead Time of the switch controlling signal of relevant complementation is general knowledge to those skilled in the art, no longer is described in detail here.
Suppose that the inner battery of intelligent battery module B1 is owing to a variety of causes; Other intelligent battery modules are variant relatively for its performance, increase (capacity is less than normal) like internal resistance, and this just means when discharge; Intelligent battery module B1 exhausts more easily; And when charging, be full of more easily (underfill still of other battery modules), influence the performance of whole battery group.
Under discharge condition, Q1 conducting during beginning, the battery in the intelligent battery module is connected with other intelligent battery modules and is powered to the load.Controller real-time sampling battery current and voltage, through suitable algorithm, the capacity of calculating accumulator.Relevant battery capacity forecast method has more implementation method, and like ampere-hour integration method, internal resistance method, terminal voltage method, look-up table etc., this does not belong to the category that the present invention need discuss.
The inner control circuit of intelligent object comprises a communication interface circuit; Mode through communication; Obtain the information of other intelligent objects in the battery pack system, these information comprise information such as the average voltage, average cell capacity of cell voltage that each intelligent object is inner or battery capacity or all intelligent object internal cells.In structure shown in Figure 2,, realize the exchange of information between the intelligent battery module through communications loop.In structure shown in Figure 3, the intelligent battery intermodule can be realized sharing of information through system battery administrative unit BMS.Communication interface circuit can like CAN bus, serial, LAN etc., not be the emphasis that the present invention paid close attention to based on existing communication means, no longer launches here to describe.
Communication interface circuit can pass through digital circuit (like single-chip microcomputer) to be realized; Based on the information that communication obtains, voltage signal of communication interface circuit output is given the control circuit of intelligent battery inside modules, the state information of other intelligent battery modules that this voltage signal indication collects; Like cell voltage, capacity etc.; Be used for the signal corresponding relatively,, realize the maximum using of equilibrium and energy with the output of adjustment intelligent object with intelligent object self.In a specific embodiment shown in Figure 5; Communication interface circuit is through the mode of communication; Obtain the internal cell information of voltage of other intelligent battery modules, export the internal cell average voltage Vavg of all intelligent battery modules in the voltage signal pilot cell group system.
The sample circuit that control circuit is inner, the voltage of self battery of sampling, current information (like the A/D sampling of adopting single-chip microcomputer etc.) can obtain the information such as capacity of intelligent object self internal cell.In specific embodiment shown in Figure 5; The average voltage signal Vavg of other intelligent object cell voltages that sample circuit obtains the battery voltage signal and the signal post of intelligent battery module self relatively, according to both difference, the control circuit of intelligent battery inside modules (controller) produces an output voltage reference signal Vo_ref; This reference signal and DC/DC current transformer (like two-way BUCK current transformer) output voltage sampled signal Vo_FB carries out closed-loop control; Produce an error signal Vea, (be the pwm signal that an error signal Vea and a sawtooth waveforms or triangular wave relatively produce Q1, Q2 control signal and Q1 are complementary through the PWM modulation for this error signal; The Q1/Q2 control signal is by certain dead band; Not shown in Fig. 5), the control signal of generation DC/DC current transformer internal switch (Q1 and Q2 among Fig. 4) realizes the control of DC/DC current transformer output voltage; Make it to reach the set point of Vo_erf, realize the equilibrium and the energy maximum using of system.
The inner sample circuit of communication interface circuit and control circuit in some embodiments, can adopt a single-chip microcomputer (MCU) or digital signal processing chip (DSP) to realize what physically be not necessarily to cut apart fully.Enrich interface because MCU or DSP contain communication interface, A/D and D/A etc., various communication modes can be realized through software programming easily.The battery information sampling (like voltage, electric current) of intelligent battery inside modules can change digital signal into through the mode of A/D conversion; The information of other intelligent battery modules that communication obtains is also directly stored with the mode of digital signal; Can compare inner directly realization of single-chip microcomputer like this; Produce the reference signal of output voltage, export an analog voltage signal like D/A through single-chip microcomputer.
As far as Fig. 4, reduce the duty ratio of Q1, make output voltage reduce, it is constant to keep output current, reduces the energy that it provides load like this.Under the situation of its off-capacity, can keep the power-on time that equates with other intelligent objects.In some simple application scenarios; The terminal voltage of battery can be similar to the representative battery capacity; The controller of intelligent battery module is compared self cell voltage with the mean value Vavg of other intelligent battery module voltage; Its difference is used for waiting its output voltage of control, and this is to realize very easily as far as DC/DC.Can keep each intelligent battery module like this and continue electric, each module based on oneself capacity (perhaps voltage) equal proportion to electric).Regulate one of output based on voltage difference and implement sketch map such as Fig. 6, shown in Figure 7.
In Fig. 6,7; As the voltage (being the input voltage vin of DC/DC current transformer) of intelligent battery inside modules battery self average voltage Vavg less than intelligent battery modular battery group; When both difference Vdif (Vdif=Vavg-Vin) surpassed a preset threshold (Vth shown in Figure 6), the controller equal proportion reduced the output voltage V o (just exporting energy) of current transformer.In one embodiment, output voltage can be expressed as Vo=Vin* (Vin+Vth)/Vavg.In execution mode shown in Figure 7, controller can be expressed as Vo=Vin* (Vin)/Vavg based on the output voltage of both poor equal proportion reduction current transformers.Like this, if the voltage of intelligent battery module self is less, its output voltage also diminishes, and its output energy also geometric ratio reduces, and prolongs its discharge time, realizes the maximum use of energy.Those skilled in the art also can have other execution mode, but generally, but both are when difference occurring, and size of adjusting its output energy is kept the whole discharge time of whole batteries to adjust its discharge time.
Under extreme case; Damage perhaps can't be discharged (situation of Vin=O) like intelligent battery inside modules battery, and internal DC/DC current transformer is no longer worked, and the Q1 of intelligent battery inside modules turn-offs; Bypass diode DF conducting (under the battery damaged condition); Whole battery group is external continued power still, improves the reliability of system greatly, and this point is particularly important as far as the battery powered vehicles.
When the voltage (being the input voltage vin of DC/DC current transformer) of intelligent battery inside modules battery self when being higher than the average voltage Vavg of intelligent battery modular battery group, need not special processing usually.Can only continue conducting by the inner Q1 of battery module, electric energy externally is provided.
Equally; The signal that obtains through communication interface circuit communication can be the internal cell capacity information of other intelligent battery modules; Export the internal cell capacity mean value of all intelligent battery modules in the voltage signal pilot cell group system; Compare with the battery capacity information of intelligent object self, the output of control intelligent battery module is similar to above-mentioned control mode based on cell voltage.In some embodiments; The battery information (like voltage or capacity etc.) of the intelligent battery inside modules of control circuit sampling can compare with the maximum through the corresponding informance of other intelligent battery modules in the battery pack that obtains of communicating by letter, to adjust the output voltage of self.Art technology can have multiple implementation under the prerequisite of essence of the present invention.
The relative discharge condition of charged state is an inverse process.Under charged state, the intelligent battery module has possessed equalization function equally under battery charging state.For the discharge control output voltage, under charged state, the intelligent battery inside modules only need be controlled the final final voltage of its charging.Usually, the outside charger of batteries charging of giving has constant-current characteristics (promptly charging the battery according to the constant current of battery pack predetermined electric current).Intelligent battery module as shown in Figure 4, under state after the initial charge, the permanent conducting of Q1, system carries out constant current charge to battery pack.The controller real-time sampling cell voltage of intelligent battery inside modules; When cell voltage reaches the final voltage of setting, if stop charging, because the pressure drop of charging current on the internal resistance of cell; Electric current is 0 o'clock; Cell voltage can descend (battery is underfill still), and this moment, the intelligent battery module need forward battery to constant voltage charge, need reduce charging current.Intelligent battery inside modules controller reduces charging current through regulating the duty ratio (duty ratio of Q2 just) of Q1, makes the terminal voltage of battery maintain set point.Like this, regardless of any intelligent battery intermodule internal cell coupling, the intelligent battery module can guarantee that its internal cell can be charged to preset threshold (also just meaning maximum capacity).Charge in batteries voltage control circuit sketch map is as shown in Figure 8.Vin_ref shown in Figure 8 is the charging voltage under the battery full state of default.Vin_FB is an intelligent battery inside modules cell voltage.As Vin_FB during more and more near reference voltage Vin_ref, error signal Vea is more little, causes the duty ratio of Q1 to diminish.When intelligent battery inside modules battery was full of, the intelligent battery module was regulated the duty ratio minimum (to 0) of Q1, the full conducting of Q2 just, and battery stops charging, and other intelligent battery modules can continue charging.
Fig. 9-13 is depicted as some two-way DC/DC current transformer topology sketch mapes commonly used, is equally applicable to intelligent battery module according to the invention.But two-way DC/DC current transformer shown in Fig. 9-13 and non exhaustive various possible two-way DC/DC current transformers, under the prerequisite that does not influence invention essence, those skilled in the art can have other two-way DC/DC current transformer execution mode.
See from top embodiment and concrete charge and discharge process; Even if occur between the battery module under any unmatched situation, system all can realize continued power and realize the charging of battery heap(ed) capacity, need not extra equalizing circuit etc.; Greatly the structure of simplified system improves system reliability.
Claims (10)
1. the intelligent battery module with autobalance ability comprises a battery cell, or a battery pack that is composed in series by n battery cell; It is characterized in that the positive pole of said battery cell or battery pack and negative pole are connected to the input of a DC/DC current transformer, two outputs of said DC/DC current transformer are exported as the intelligent battery module;
Said intelligent battery module also comprises a control circuit, and this control circuit has a communication interface circuit, be used for to control circuit index signal being provided, and control circuit is regulated the output voltage of intelligent battery module based on this index signal.
2. intelligent battery module according to claim 1; It is characterized in that said index signal is at least a in the following signal: average voltage signal, average cell capacity signal, maximum voltage signal or the maximum battery capacity signal of all intelligent object internal cells in the battery pack.
3. intelligent battery module according to claim 1 is characterized in that, said DC/DC current transformer is two-way DC/DC current transformer.
4. intelligent battery module according to claim 3; It is characterized in that; The output of said two-way DC/DC current transformer has an inverse parallel diode, and said diode cathode is connected to said current transformer output plus terminal, and said diode anode is connected to said current transformer output negative terminal.
5. intelligent battery module according to claim 3; It is characterized in that said two-way DC/DC current transformer is any one in the following non-isolation type current transformer: two-way BUCK current transformer, two-way BOOST current transformer, two-way BUCK-BOOST current transformer, two-way CUK current transformer, two-way SEPIC current transformer or two-way ZETA current transformer.
6. the battery pack with autobalance ability is characterized in that, this battery pack comprises at least 2 intelligent battery modules; Said intelligent battery module includes: a DC/DC current transformer, a control circuit, a battery cell or a battery pack that is composed in series by several battery cells; The both positive and negative polarity of battery cell or battery pack is connected to the DC/DC current transformer, and two outputs of said DC/DC current transformer are exported as the intelligent battery module;
Said control circuit comprises a communication interface circuit; The communication interface circuit of each intelligent battery module interconnects through order wire; Be used to exchange the internal information of intelligent battery module; And provide index signal to the control circuit of intelligent battery inside modules separately, and control circuit is regulated intelligent battery module output voltage based on this index signal.
7. according to the said battery pack of claim 6; It is characterized in that said index signal is at least a in the following signal: average voltage signal, average cell capacity signal, maximum voltage signal or the maximum battery capacity signal of all intelligent object internal cells in the battery pack.
8. battery pack according to claim 6; It is characterized in that; Said DC/DC current transformer is two-way DC/DC current transformer, is in the following non-isolation type current transformer any one: two-way BUCK current transformer, two-way BOOST current transformer, two-way BUCK-BOOST current transformer, two-way CUK current transformer, two-way SEPIC current transformer or two-way ZETA current transformer.
9. battery pack according to claim 8; It is characterized in that; The output of said two-way DC/DC current transformer has an inverse parallel diode, and said diode cathode is connected to said current transformer output plus terminal, and said diode anode is connected to said current transformer output negative terminal.
10. according to the battery pack described in any one of the claim 6 to 9, it is characterized in that, after the communication interface circuit of said each intelligent battery module interconnects through order wire, also be connected and be used to realize information exchange with the system battery administrative unit.
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