CN203839984U - Power balance management system for series lithium battery pack - Google Patents
Power balance management system for series lithium battery pack Download PDFInfo
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- CN203839984U CN203839984U CN201320789211.9U CN201320789211U CN203839984U CN 203839984 U CN203839984 U CN 203839984U CN 201320789211 U CN201320789211 U CN 201320789211U CN 203839984 U CN203839984 U CN 203839984U
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Abstract
The utility model proposes a power balance management system for a series lithium battery pack, and the system comprises a battery pack power module and a charging power module which is connected with the battery pack power module through a DC power line. The battery pack power module comprises a series lithium battery pack, a voltage detection control circuit, and a segmented series switching circuit. When detecting that the difference between the maximum and minimum voltages between single-string batteries during the discharging of the series lithium battery pack, the voltage detection control circuit controls the segmented series switching circuit to cut off the single-string battery with the minimum voltage. If the voltage detection control circuit detects that one single-string battery reaches saturation at first during charging, the voltage detection control circuit cuts off the single-string battery which reaches saturation at first, and transmits the change information of series connection number to the charging power module for adjusting a charging voltage. The beneficial effects of the utility model lie in that the circuit structure is simple, the charge-discharge circulation in the battery pack is avoided, and the energy consumption is low.
Description
Technical field
The utility model relates to field of power supplies, particularly a kind of serial lithium battery group power supply equalization management system.
Background technology
Lithium battery because its energy density is high, self discharge is little, the plurality of advantages such as memory-less effect, environmental protection, long service life and single battery voltage height is widely used, as mobile device main flow battery product, gradually toward high-power, large electric current High Voltage Power Supply device orientation development.The voltage of lithium battery cannot meet the demand of middle powerful device, needs series connection multiple batteries just can reach the input voltage of institute's power supply unit or its power adapter circuit requirement, or avoids low-voltage, high-current input to reduce the loss of incoming line and rectification.When lithium battery series connection is used, due to the initial performance in battery manufacture process (as self-discharge rate, capacity etc.) is inconsistent and use procedure in because battery internal and external environment (as temperature) inhomogeneous causes aging speed different, make the capacity of battery different, and the difference between them also can become along with the increase of service time greatly, this will cause in the course of work each crosstalk pond charging and discharging state inconsistent.For preventing that over-charging of battery that wherein capacity is low from crossing, put; general lithium battery is all added with protective circuit; at cell voltage, higher than specified higher limit or in lower than specified lower limit, disconnect, whole series lithium battery group is therefrom cut off and is quit work, and its whole volume depends on that a string battery that capacity is minimum.Therefore, the impact for fear of the inconsistency cause of lithium battery on overall performance, need to carry out balanced management to the electric discharge of serial lithium battery group and charging.
At present, the balanced way of battery pack mainly contains shunting wear leveling and electric weight transfer equilibrium.The former carries out equilibrium at each single string cell parallel partial flow bypass path to the high battery strings discharge loss of capacity.Its circuit structure of this mode is simple, but can not supplement electric weight for the low battery of capacity, has the problem that power loss is large and heating is serious, and balancing procedure generally carries out in charging process.The latter carries out electric weight transfer to the lower a string battery of voltage, in discharge process, the electric weight of other battery is supplemented to it, is transferred to other crosstalk pond in charging process, but circuit structure is comparatively complicated, needs isolation coupling.The mode that can be divided into many-one and shift one to one.Many-one is in whole string battery pack and voltage is lower shifts between a string, only need output isolation, but balancing procedure can have influence on whole string battery pack, making all batteries all repeatedly do oneself discharges and recharges mutually, increase the idle burden in each crosstalk pond and consume its cycle life, shifting one to one and need two isolation, will there be the DC/DC circuit of an input and output isolation in corresponding each crosstalk pond, between the high and minimum two crosstalk ponds of voltage, carry out electric weight transfer, the more complicated burden of circuit structure.No matter adopt which kind of mode, because equilibrium output is all that output voltage is generally below 4V to the charging of single crosstalk pond, rectifier loss is very large, and the input/output efficiency of common balanced DC/DC circuit is lower than 80%.In other equalization scheme, a kind of method that more typically also has electric weight resettlement, using super capacity or another one battery as intermediate carrier, repeatedly high with electric weight, between two low crosstalk ponds, discharge and recharge to switch and realize equilibrium, but this passive passive type discharges and recharges and needs battery and the intermediate carrier voltage difference will be at 0.1V, namely between two crosstalk ponds, voltage difference just can be carried out effective electric weight resettlement more than 0.2V, in cell voltage 3.7V left and right, the voltage difference of 0.2V is equivalent to the load difference of capacity 40% left and right, the large speed of this mode equalization deviation is slow, be difficult to catch up with charging and discharging speed.
Utility model content
The technical problems to be solved in the utility model is, for the foregoing circuit complex structure of prior art, increase the inner charge and discharge cycles of battery pack, defect that energy loss is larger, provide a kind of circuit structure simple, avoid the inner charge and discharge cycles of battery pack, serial lithium battery group power supply equalization management system that energy loss is less.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of serial lithium battery group power supply equalization management system, comprise battery power module and charge power supply module, between described battery power module and described charge power supply module, by DC power line, be connected, described battery power module comprises serial lithium battery group, voltage detecting and controling circuit and disjunction serial connection commutation circuit, when the difference that described voltage detecting and controling circuit detects the ceiling voltage of described serial lithium battery group between when electric discharge its each single crosstalk pond and minimum voltage surpasses predefined threshold value, control described disjunction serial connection commutation circuit by the minimum single crosstalk pond disjunction from described serial lithium battery group of voltage, if single crosstalk pond reaches capacity in advance when described voltage detecting and controling circuit detects charging, control described disjunction serial connection commutation circuit by the single crosstalk pond disjunction from described serial lithium battery group reaching capacity in advance, and the information that described serial lithium battery group serial connection number is changed is sent to described charge power supply module, described charge power supply module regulates its charging voltage according to the serial connection number of described serial lithium battery group.
In serial lithium battery group power supply equalization management system described in the utility model, described disjunction serial connection commutation circuit comprise its number and described serial lithium battery group be connected in series number consistent, respectively with single-pole double throw relay that in described serial lithium battery group, each single crosstalk pond is connected.
In serial lithium battery group power supply equalization management system described in the utility model, described serial lithium battery group also comprises its number and described serial lithium battery group serial connection number is consistent, respectively with described serial lithium battery group in the Schottky diode of each single string cell parallel.
In serial lithium battery group power supply equalization management system described in the utility model, described battery power module also comprises with described voltage detecting and controling circuit and being connected, for generation of the current pulse signal modulation circuit of certain frequency pulsed current signal, described current pulse signal modulation circuit is sent to described charge power supply module by the pulsed current signal of generation by described DC power line.
In serial lithium battery group power supply equalization management system described in the utility model, described battery power module also comprises the DC/DC adapter circuit being connected with described serial lithium battery group, and described DC/DC adapter circuit is also connected with load.
In serial lithium battery group power supply equalization management system described in the utility model, described charge power supply module comprises current pulse signal demodulator circuit, output voltage controlling circuit and AC/DC switching circuit, described current pulse signal demodulator circuit sends to described output voltage controlling circuit after receiving described current pulse signal and described current pulse signal being demodulated to frequency information, and described output voltage controlling circuit produces corresponding control signal and controls described AC/DC switching circuit according to described frequency information and completes the adjustment to charging voltage and charging current.
In serial lithium battery group power supply equalization management system described in the utility model, described current pulse signal modulation circuit comprises the first current sampling resistor, metal-oxide-semiconductor and for playing the isolating diode of buffer action, the anode of described isolating diode is connected with one end of the first current sampling resistor with described charge power supply module respectively, negative electrode is connected with described serial lithium battery group, the other end of described the first current sampling resistor is connected with the drain electrode of described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, grid is connected with a port of described voltage detecting and controling circuit, described voltage detecting and controling circuit produces the current pulse signal of certain frequency by controlling the turn-on and turn-off of described metal-oxide-semiconductor.
In serial lithium battery group power supply equalization management system described in the utility model, described current pulse signal demodulator circuit comprises the first comparison circuit, and described the first comparison circuit comprises the second current sampling resistor and the first voltage comparator; One end of described the second current sampling resistor is connected with described battery power module and for converting described current pulse signal to voltage signal, one end of described the second current sampling resistor is also connected, by the 13 resistance, is connected with the negative input of described the first voltage comparator with the positive input of described the first voltage comparator by the 12 resistance, the positive input of described the first voltage comparator is also by the 3rd electric capacity and the 14 grounding through resistance in parallel, and the negative input of described the first voltage comparator is also by the 4th capacity earth.
In serial lithium battery group power supply equalization management system described in the utility model, described current pulse signal demodulator circuit also comprises the second comparison circuit, described the second comparison circuit comprises second voltage comparator, the output of described the first voltage comparator is connected with the positive input of described second voltage comparator, the negative input of described second voltage comparator is connect power supply, is passed through the 17 grounding through resistance by the 16 resistance, and the output of described second voltage comparator is connected with described output voltage controlling circuit.
In serial lithium battery group power supply equalization management system described in the utility model, described AC/DC switching circuit comprises feedback voltage circuit and the feedback regulating circuit being connected with described feedback voltage circuit, described feedback voltage circuit comprises the 9th resistance and the tenth resistance, and one end of described the tenth resistance is connected with described the 9th resistance, the other end ground connection of described the tenth resistance, described feedback regulating circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first triode, the second triode, the 3rd triode and the 4th triode, one end of described the first resistance, one end of the second resistance, one end of one end of the 3rd resistance and the 4th resistance is connected with one end of described the tenth resistance, the other end of described the first resistance, the other end of the second resistance, the other end of the other end of the 3rd resistance and the 4th resistance respectively with the collector electrode of described the first triode, the collector electrode of the second triode, the collector electrode of the 3rd triode, the collector electrode of the 4th triode connects, the emitter of described the first triode, the emitter of the second triode, the emitter of the emitter of the 3rd triode and the 4th triode altogether, the base stage of described the first triode, the base stage of the second triode, the base stage of the base stage of the 3rd triode and the 4th triode respectively with one end of described the 5th resistance, one end of the 6th resistance, one end of the 7th resistance is connected with one end of the 8th resistance, the other end of described the 5th resistance, the other end of the 6th resistance, the other end of the other end of the 7th resistance and the 8th resistance respectively with the first control end of described output voltage controlling circuit, the second control end, the 3rd control end is connected with the 4th control end.
Implement serial lithium battery group power supply equalization management system of the present utility model, there is following beneficial effect: owing to using battery power module and charge power supply module, battery power module comprises serial lithium battery group, voltage detecting and controling circuit and disjunction serial connection commutation circuit, when the difference that voltage detecting and controling circuit detects the ceiling voltage of serial lithium battery group between when electric discharge its each single crosstalk pond and minimum voltage surpasses predefined threshold value, control disjunction serial connection commutation circuit by the minimum single crosstalk pond disjunction from serial lithium battery group of voltage, when when voltage detecting and controling circuit detects charging, single crosstalk pond reaches capacity in advance, control disjunction serial connection commutation circuit by the described single crosstalk pond disjunction from described serial lithium battery group reaching capacity in advance, and the information exchange that serial lithium battery group serial connection number is changed is crossed DC power line and is sent to charge power supply module controls charging voltage to adapt to the change of battery pack string number, the idle certain hour of cut battery strings is concatenated in battery pack by it more again, with this, realize balanced discharge or the charging in each crosstalk pond, because the current impulse modulation system without additional channels transfers signals to charge power supply module, so its circuit structure is simple, avoided general electric weight to shift the inner charge and discharge cycles of battery pack and the energy loss of balanced way simultaneously, make energy loss less, thereby improve whole volume and the useful life of serial lithium battery group.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the electrical block diagram in embodiment of the utility model serial lithium battery group power supply equalization management system;
Fig. 2 is that in described embodiment, battery minute connection breaking is switched schematic diagram;
Fig. 3 is the circuit theory diagrams of current pulse signal modulation circuit in described embodiment;
Fig. 4 is the circuit theory diagrams of current pulse signal modulation circuit in described embodiment;
Fig. 5 is the circuit theory diagrams of AC/DC switching circuit in described embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
In the utility model series connection, in battery power balanced management system embodiment, the structural representation of its system as shown in Figure 1.In Fig. 1, this serial lithium battery group power supply equalization management system comprises battery power module 1 and charge power supply module 2, between battery power module 1 and charge power supply module 2, by DC power line, is connected, battery power module 1 comprises serial lithium battery group 11, voltage detecting and controling circuit 12 and disjunction serial connection commutation circuit 13, voltage detecting and controling circuit 12 comprises MCU (not shown), when the difference that voltage detecting and controling circuit 12 detects the ceiling voltage of serial lithium battery group 11 between when electric discharge its each single crosstalk pond and minimum voltage surpasses predefined threshold value, control disjunction serial connection commutation circuit 13 by the minimum single crosstalk pond disjunction from serial lithium battery group 11 of voltage in serial lithium battery group 11, if single crosstalk pond reaches capacity in advance when voltage detecting and controling circuit 12 detects charging, control disjunction serial connection commutation circuit 13 by the single crosstalk pond disjunction from serial lithium battery group 11 reaching capacity in advance, and the information that serial lithium battery group 11 serial connection numbers are changed is sent to charge power supply module 2, charge power supply module 2 regulates its charging voltage according to the serial connection number of serial lithium battery group 11.Specifically, in the course of work, adopt the mode of disjunction equilibrium, certain hour only temporarily leaves unused the lower a string battery strings of capacity, maintain the work in other crosstalk pond simultaneously, avoid electric weight to shift the charge and discharge cycles of balanced loss and battery pack inside, in charging process, by DC power line and charge power supply module 2, communicate, without increasing in addition special-purpose physical channel, battery is connected to communication that number changes to charge power supply, make it regulation output voltage to adapt to the charge voltage range of different string number lithium battery groups.
In the present embodiment, need the problem solving to be, in charging process, how serial lithium battery group 11 string numbers are reduced or increase a string information sending charge power supply module 2 one end to, make charge power supply module 2 adjust output voltage to adapt to the variation of serial lithium battery group 11 string numbers.Common method is to set up an other communication link this information to be sent to one end of charge power supply module 2.According to this design, if adopt wireless transmission certainly will increase design difficulty and product cost.If increase a wire link between battery power module 1 and charge power supply module 2, can cause the trouble of interface between them.In the present embodiment, utilize existing DC charge power supply line to have both signal transmssion line, can not introduce unnecessary communication line, the simplification of implementation structure and operation.
In the present embodiment, battery power module 1 also comprises current pulse signal modulation circuit 16; Current pulse signal modulation circuit 16 is connected with voltage detecting and controling circuit 12, for generation of certain frequency pulsed current signal, current pulse signal modulation circuit 16 is sent to charge power supply module 2 by the pulsed current signal of generation by DC power line.Battery power module also comprises DC/DC adapter circuit 14, and DC/DC adapter circuit 14 is connected with serial lithium battery group 11, and DC/DC adapter circuit 14 is also connected with load 15.
In the present embodiment, charge power supply module 2 comprises current pulse signal demodulator circuit 21, output voltage controlling circuit 23 and AC/DC switching circuit 23, described current pulse signal demodulator circuit sends to described output voltage controlling circuit after receiving described current pulse signal and described current pulse signal being demodulated to frequency information, and described output voltage controlling circuit produces corresponding control signal and controls described AC/DC switching circuit according to described frequency information and completes the adjustment to charging voltage and charging current.
Fig. 2 is that in the present embodiment, battery minute connection breaking is switched schematic diagram, and in Fig. 2, serial lithium battery group 11 comprises n string battery strings, is referred to as the first crosstalk pond B
1..., n-1 crosstalk pond B
n-1with n crosstalk pond B
ndisjunction serial connection commutation circuit 13 comprise its number and serial lithium battery group 11 be connected in series numbers consistent, respectively with the single-pole double throw relay that in serial lithium battery group 11, each single crosstalk pond is connected, respectively these single-pole double throw relays are referred to as successively to the first single-pole double throw relay S
1..., n-1 single-pole double throw relay S
n-1with n single-pole double throw relay S
nserial lithium battery group 11 also comprise its number and serial lithium battery group 11 serial connection numbers consistent, respectively with serial lithium battery group 11 in the Schottky diode of each single string cell parallel, namely every crosstalk pond is in parallel with a Schottky diode respectively simultaneously, in the present embodiment, successively these Schottky diodes are referred to as to the first Schottky diode B
1..., n-1 crosstalk pond B
n-1with n crosstalk pond B
n.
Voltage detecting and controling circuit 12 is responsible for gathering voltage data, control single-pole double throw relay disjunction equalizing circuit and the current pulse signal modulation circuit 16 of serial lithium battery group 11.During work, according to voltage over time first, judgement serial lithium battery group 11 is in charged state or discharge condition to voltage detecting and controling circuit 12.If serial lithium battery group 11 is in discharge condition, voltage detecting and controling circuit 12 timing acquiring serial lithium battery group 11 voltage statuss and discharging current information, and the voltage in each gathered crosstalk pond is calculated and compared.If the difference of ceiling voltage and minimum voltage surpasses predefined threshold value between each single crosstalk pond of battery pack, or certain crosstalk cell voltage is lower than normal range of operation lower limit (being 3.3V in the present embodiment), and voltage detecting and controling circuit 12 is controlled corresponding single-pole double throw relay (S
1-S
n) switch, by this crosstalk pond disjunction from serial lithium battery group 11, make discharging current from single-pole double throw relay (S
1-S
n) another contact walks around this crosstalk pond, makes it not participate in 11 electric discharges of serial lithium battery group, all the other battery strings continue to discharge into, until when this crosstalk pond obtains voltage and equates, then by voltage detecting and controling circuit 12 control single-pole double throw relay (S
1-S
n) switch, it is rejoined in battery pack to task again.Like this, the process of the detection-disjunction-serial connection by repeatedly, realizes the equalization discharge between serial lithium battery group 11 each crosstalk ponds.
It is worth mentioning that, the contact change-over of single-pole double throw relay needs the time of about several milliseconds to 10 milliseconds conventionally, in the time of turning in its contact, being connected to herein of whole string serial lithium battery group 11 disconnects, for load request in a lot of situations, continue large electric current power supply, in contact change-over, occur the situation that supply current interrupts, between each crosstalk pond, a diode in parallel, adopts the Schottky diode that forward voltage drop is lower conventionally.During normal work, Schottky diode is in reverse blocking state, during the contact change-over of single-pole double throw relay, Schottky diode is connected between single-pole double throw relay contact and keeps forward conduction, make electric current continue to pass through in serial lithium battery group 11, guarantee like this continuity of electric current during the redirect of contact.If rely on the electric capacity of output circuit to maintain power supply to load at single-pole double throw relay contact between transfer period, this electric capacity needs very large capacity, for small size design and the continued power Reliability Assurance of battery power module 1, is disadvantageous.
If serial lithium battery group 11 is in charged state, voltage detecting and controling circuit 12 timing acquiring each crosstalk cell voltage and charging current, and the charging current adapting in different voltage ranges according to lithium battery, to charge power supply module 2, send the control signal that electric current regulates.In serial lithium battery group 11 being detected, certain crosstalk pond is saturated; and other crosstalk pond is when be not yet full of; for fear of saturated a string battery, because IC protective circuit prevents from overcharging, turn-off charge circuit, voltage detecting and controling circuit 12 is controlled single-pole double throw relay (S
1-S
n) switch this crosstalk pond disjunction, the corresponding single-pole double throw relay of charging current pile warp, continues to other battery strings charging in serial lithium battery group 11.
Fig. 3 is the circuit theory diagrams of current pulse signal modulation circuit in the present embodiment, and in Fig. 3, current pulse signal modulation circuit 16 comprises the first current sampling resistor R
d, metal-oxide-semiconductor Q
0with the isolating diode D for a buffer action
0, isolating diode D
0anode respectively with charge power supply module 2 and the first current sampling resistor R
done end connect, negative electrode is connected with serial lithium battery group 11, the first current sampling resistor R
dthe other end and metal-oxide-semiconductor Q
0drain electrode connect, metal-oxide-semiconductor Q
0source ground, grid is connected with a port of voltage detecting and controling circuit 12.A port controlling metal-oxide-semiconductor Q by voltage detecting and controling circuit 12
0conducting and cut-off, on DC power line, produce potline current superimposed pulses to charging direct current on, at serial lithium battery group 11 front ends, add an isolating diode D
0through battery pack loop, to reduce the current impulse amplitude on charging circuit for fear of current impulse.Modulation scheme can adopt conventional pulse frequency modulated, pulse width modulation or pulse position modulation etc., here adopt pulse frequency modulated to be relatively convenient to voltage detecting and controling circuit 12 and detect reception, by different current pulse frequency, represent different information, namely voltage detecting and controling circuit 12 is by controlling metal-oxide-semiconductor Q
0turn-on and turn-off produce the current pulse signal of certain frequency.When charged state, before single-pole double throw relay switch, voltage detecting and controling circuit 12 is controlled the pulse current that metal-oxide-semiconductor Q0 turn-on and turn-off produce certain frequency (as 1k, 2k etc.), and these current impulses are superimposed upon on DC charging electric current, and different frequencies represents different control informations.Because signal sends, to account for the ratio in charging interval very little, and the power loss that this current impulse modulation causes is also very little, and the main power loss increasing occurs in isolating diode D
0with current sampling resistor R
dupper, but for charging process or the acceptable of mains-supplied.In charge power supply module 2, after demodulator circuit detection, shaping, by the represented information of voltage detecting and controling circuit 12 identification different pulse frequency, namely after demodulation, control charging output voltage is adjusted.This communication modes has been avoided extra communication line, has realized the communication between 1 two power modules of charge power supply module 2 and battery power module.In order to prevent serial lithium battery group 11, the first current sampling resistor R
dwith metal-oxide-semiconductor Q
0form discharge loop, at serial lithium battery group 11 front ends, add isolating diode D
0as isolation, when both can having made communication, this processing serial lithium battery group 11 was not formed to electric discharge, do not affect again charging normal of serial lithium battery group 11.
Charge power supply module 2 can just be adjusted according to the connection status of serial lithium battery group 11 and voltage the size of charging voltage and electric current.Battery power module 1 is according to voltage and the charging current situation in each crosstalk pond gathering, when charging current is excessive or when too small, by above-mentioned communication modes in the present embodiment, corresponding frequency information is sent to one end of charge power supply module 2, current pulse signal demodulator circuit 21 demodulates corresponding frequency information again, by output voltage controlling circuit 22 output control signals, controls the adjustment that AC/DC switching circuit 23 completes charging voltage and electric current.In the present embodiment, output voltage controlling circuit 22 comprises MCU (not shown).
Fig. 4 is the circuit theory diagrams of current pulse signal modulation circuit in the present embodiment, is exactly integral contrast device in Fig. 4 in fact, and the detection that can realize current pulse signal receives.In Fig. 4, current pulse signal demodulator circuit 21 comprises the first comparison circuit, and the first comparison circuit comprises the second current sampling resistor R
swith the first voltage comparator U
4A; The second current sampling resistor R
sone end be connected with battery power module 1 and for converting current pulse signal to voltage signal, the second current sampling resistor R
sone end also by the 12 resistance R 12 and the first voltage comparator U
4Apositive input connect, by the 13 resistance R 13 and the first voltage comparator U
4Anegative input connect, the first voltage comparator U
4Apositive input also by parallel the 3rd capacitor C 3 and the 14 resistance R 14 ground connection, the first voltage comparator U
4Anegative input also by the 4th capacitor C 4 ground connection.
In the present embodiment, current pulse signal demodulator circuit 21 also comprises the second comparison circuit, and the second comparison circuit comprises second voltage comparator U
4B, the first voltage comparator U
4Aoutput and second voltage comparator U
4Bpositive input connect, second voltage comparator U
4Bnegative input by the 16 resistance R 16 connect power supply, by the 17 resistance R 17 ground connection, second voltage comparator U
4Boutput be connected with output voltage controlling circuit 22.In Fig. 4, by relatively momentary pulse current signal being extracted with integration current.Generally, due to the 12 resistance R
12with the 14 resistance R
14dividing potential drop and the 4th capacitor C
4effect, the first voltage comparator U
4Aanti-phase input terminal voltage a little more than in-phase input end, output output low level.For the electric current shake that prevents that in loop, interference signal causes, then add one-level second voltage comparator U
4B.Second voltage comparator U
4Bwith the 16 resistance R
16with the 17 resistance R
17to supply voltage V
dCdividing potential drop as second voltage comparator U
4Breference voltage, the first voltage comparator U
4Aoutput as homophase input voltage.When there is the moment of pulse current in charge circuit, the first voltage comparator U
4Ain-phase input end voltage higher than anti-phase input terminal voltage, momentary pulse electric current is greater than integration current, is output as high level.In like manner, second voltage comparator U
4Boutput is also high level, so just current pulse signal has been reduced into the control signal of original frequency.Detected pulse signal will be input to output voltage controlling circuit 22 and carry out frequency identification, then control AC/DC switching circuit 23 by output voltage controlling circuit 22, realize corresponding voltage, electric current adjusting.Typical switching power source chip inside all provides the reference voltage of a standard, and the PWM that namely in the present embodiment, AC/DC switching circuit 23 is relatively realized output voltage by dividing potential drop feedback and this reference voltage of output controls.
Fig. 5 is the circuit theory diagrams of AC/DC switching circuit in embodiment, and the 9th resistance R 9 and the tenth resistance R 10 have formed the feedback voltage circuit of AC/DC switching circuit 23, R
1-R
8and Q
1-Q
4formed feedback regulating circuit.Control1-control4 is the control port of MCU output voltage controlling circuit 22.AC/DC switching circuit 23 comprises feedback voltage circuit and feedback regulating circuit, and feedback regulating circuit is connected with feedback voltage circuit.Particularly, feedback voltage circuit comprises that one end of the 9th resistance R 9 and the tenth resistance R 10, the ten resistance R 10 is connected with the 9th resistance R 9, the other end ground connection of the tenth resistance R 10, feedback regulating circuit comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th electric R8, the first triode Q1, the second triode Q2, the 3rd triode Q3 and the 4th triode Q4, one end of the first resistance R 1, one end of the second resistance R 2, one end of one end of the 3rd resistance R 3 and the 4th resistance R 4 is connected with one end of the tenth resistance R 10, the other end of the first resistance R 1, the other end of the second resistance R 2, the other end of the other end of the 3rd resistance R 3 and the 4th resistance R 4 respectively with the collector electrode of the first triode Q1, the collector electrode of the second triode Q2, the collector electrode of the 3rd triode Q3, the collector electrode of the 4th triode Q4 connects, the emitter of the first triode Q1, the emitter of the second triode Q2, the emitter of the emitter of the 3rd triode Q3 and the 4th triode Q4 altogether, the base stage of the first triode Q1, the base stage of the second triode Q2, the base stage of the base stage of the 3rd triode Q3 and the 4th triode Q4 respectively with one end of the 5th resistance R 5, one end of the 6th resistance R 6, one end of the 7th resistance R 7 is connected with one end of the 8th resistance R 8, the other end of the 5th resistance R 5, the other end of the 6th resistance R 6, the other end of the other end of the 7th resistance R 7 and the 8th resistance R 8 respectively with the first control end Control1 of output voltage controlling circuit 22, the second control end Control2, the 3rd control end Control3 is connected with the 4th control end Control4.Triode Q
1-Q
4play on-off action, high level conducting, otherwise by.R during conducting
1-R
4with R
10parallel connection, resistance changes, and has changed the feedback voltage of AC/DC switching circuit 23, and then the charging voltage of output, electric current also change thereupon.Four regulating resistance R
1-R
4combination can form 16 (2 mutually
4) plant resistance, output voltage controlling circuit 22 can be controlled 16 charging levels of AC/DC switching circuit 22 outputs, realizes charge power supply module 2 and according to serial lithium battery group 11 voltage statuss, changes the object of charging voltage and current.
In a word, in the present embodiment, during electric discharge, if other crosstalk cell voltage difference surpasses predefined threshold value in certain crosstalk pond and serial lithium battery group 11, this crosstalk pond is cut off and made it unsettled and break-off by relay, other battery maintains with load 5 and is communicated with continuous firing, close with it or while equating, single-pole double throw relay switch returns it to be reconnected seal in serial lithium battery group 11 again to work on until the voltage of other battery, during charging, if it is too fast that certain crosstalk cell voltage rises, voltage detecting and controling circuit 12 passes through single-pole double throw relay equally by its disjunction from serial lithium battery group 11, time-out charges to it, the information simultaneously serial lithium battery group 11 serial connection numbers being changed is sent to charge power supply module 2, make it to be adjusted to suitable charging voltage, other battery is continued to charging, while waiting again these cell voltages to rise to the voltage before idle battery disjunction, single-pole double throw relay resets and it is concatenated in battery pack again, this information sends to charge power supply module 2 and is received and processed by output voltage controlling circuit 22 by current pulse signal demodulator circuit 21 wherein, the output voltage of adjusting charge power supply module 2 makes it to adapt with the string number of serial lithium battery group 11, so until charged.Adopt like this method of the lower a string battery disjunction of capacity is reached to balanced, simple in structure, be easy to control.
By DC power line, without the current impulse modulation system of additional channels, transfer signals to charge power supply module controls charging voltage to adapt to the change of battery pack string number.This disjunction balancing technique has been avoided the inner charge and discharge cycles of battery pack and the energy loss of general electric weight transfer balanced way, thus whole volume and the useful life of improving lithium battery group.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. a serial lithium battery group power supply equalization management system, is characterized in that, comprises battery power module and charge power supply module, between described battery power module and described charge power supply module, by DC power line, is connected, described battery power module comprises serial lithium battery group, voltage detecting and controling circuit and disjunction serial connection commutation circuit, when the difference that described voltage detecting and controling circuit detects the ceiling voltage of described serial lithium battery group between when electric discharge its each single crosstalk pond and minimum voltage surpasses predefined threshold value, control described disjunction serial connection commutation circuit by the minimum single crosstalk pond disjunction from described serial lithium battery group of voltage, if single crosstalk pond reaches capacity in advance when described voltage detecting and controling circuit detects charging, control described disjunction serial connection commutation circuit by the single crosstalk pond disjunction from described serial lithium battery group reaching capacity in advance, and the information that described serial lithium battery group serial connection number is changed is sent to described charge power supply module, described charge power supply module regulates its charging voltage according to the serial connection number of described serial lithium battery group.
2. serial lithium battery group power supply equalization management system according to claim 1, it is characterized in that, described disjunction serial connection commutation circuit comprise its number and described serial lithium battery group be connected in series number consistent, respectively with single-pole double throw relay that in described serial lithium battery group, each single crosstalk pond is connected.
3. serial lithium battery group power supply equalization management system according to claim 2, it is characterized in that, described serial lithium battery group also comprises its number and described serial lithium battery group serial connection number is consistent, respectively with described serial lithium battery group in the Schottky diode of each single string cell parallel.
4. serial lithium battery group power supply equalization management system according to claim 3, it is characterized in that, described battery power module also comprises with described voltage detecting and controling circuit and being connected, for generation of the current pulse signal modulation circuit of certain frequency pulsed current signal, described current pulse signal modulation circuit is sent to described charge power supply module by the pulsed current signal of generation by described DC power line.
5. serial lithium battery group power supply equalization management system according to claim 4, is characterized in that, described battery power module also comprises the DC/DC adapter circuit being connected with described serial lithium battery group, and described DC/DC adapter circuit is also connected with load.
6. according to the serial lithium battery group power supply equalization management system described in claim 4 any one, it is characterized in that, described charge power supply module comprises current pulse signal demodulator circuit, output voltage controlling circuit and AC/DC switching circuit, described current pulse signal demodulator circuit receives described current pulse signal, and after being demodulated to frequency information, described current pulse signal sends to described output voltage controlling circuit, described output voltage controlling circuit produces corresponding control signal according to described frequency information, and control described AC/DC switching circuit and complete the adjustment to charging voltage and charging current.
7. serial lithium battery group power supply equalization management system according to claim 6, it is characterized in that, described current pulse signal modulation circuit comprises the first current sampling resistor, metal-oxide-semiconductor and for playing the isolating diode of buffer action, the anode of described isolating diode is connected with one end of the first current sampling resistor with described charge power supply module respectively, negative electrode is connected with described serial lithium battery group, the other end of described the first current sampling resistor is connected with the drain electrode of described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, grid is connected with a port of described voltage detecting and controling circuit, described voltage detecting and controling circuit produces the current pulse signal of certain frequency by controlling the turn-on and turn-off of described metal-oxide-semiconductor.
8. serial lithium battery group power supply equalization management system according to claim 7, is characterized in that, described current pulse signal demodulator circuit comprises the first comparison circuit, and described the first comparison circuit comprises the second current sampling resistor and the first voltage comparator; One end of described the second current sampling resistor is connected with described battery power module and for converting described current pulse signal to voltage signal, one end of described the second current sampling resistor is also connected, by the 13 resistance, is connected with the negative input of described the first voltage comparator with the positive input of described the first voltage comparator by the 12 resistance, the positive input of described the first voltage comparator is also by the 3rd electric capacity and the 14 grounding through resistance in parallel, and the negative input of described the first voltage comparator is also by the 4th capacity earth.
9. serial lithium battery group power supply equalization management system according to claim 8, it is characterized in that, described current pulse signal demodulator circuit also comprises the second comparison circuit, described the second comparison circuit comprises second voltage comparator, the output of described the first voltage comparator is connected with the positive input of described second voltage comparator, the negative input of described second voltage comparator is connect power supply, is passed through the 17 grounding through resistance by the 16 resistance, and the output of described second voltage comparator is connected with described output voltage controlling circuit.
10. serial lithium battery group power supply equalization management system according to claim 9, is characterized in that, described AC/DC switching circuit comprises feedback voltage circuit and the feedback regulating circuit being connected with described feedback voltage circuit, described feedback voltage circuit comprises the 9th resistance and the tenth resistance, and one end of described the tenth resistance is connected with described the 9th resistance, the other end ground connection of described the tenth resistance, described feedback regulating circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first triode, the second triode, the 3rd triode and the 4th triode, one end of described the first resistance, one end of the second resistance, one end of one end of the 3rd resistance and the 4th resistance is connected with one end of described the tenth resistance, the other end of described the first resistance, the other end of the second resistance, the other end of the other end of the 3rd resistance and the 4th resistance respectively with the collector electrode of described the first triode, the collector electrode of the second triode, the collector electrode of the 3rd triode, the collector electrode of the 4th triode connects, the emitter of described the first triode, the emitter of the second triode, the emitter of the emitter of the 3rd triode and the 4th triode altogether, the base stage of described the first triode, the base stage of the second triode, the base stage of the base stage of the 3rd triode and the 4th triode respectively with one end of described the 5th resistance, one end of the 6th resistance, one end of the 7th resistance is connected with one end of the 8th resistance, the other end of described the 5th resistance, the other end of the 6th resistance, the other end of the other end of the 7th resistance and the 8th resistance respectively with the first control end of described output voltage controlling circuit, the second control end, the 3rd control end is connected with the 4th control end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320789211.9U CN203839984U (en) | 2013-12-03 | 2013-12-03 | Power balance management system for series lithium battery pack |
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| CN201320789211.9U CN203839984U (en) | 2013-12-03 | 2013-12-03 | Power balance management system for series lithium battery pack |
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| CN203839984U true CN203839984U (en) | 2014-09-17 |
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| CN201320789211.9U Expired - Fee Related CN203839984U (en) | 2013-12-03 | 2013-12-03 | Power balance management system for series lithium battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647316A (en) * | 2013-12-03 | 2014-03-19 | 深圳市雅格朗电子有限公司 | Serially-connected lithium battery set power supply equalization management system |
| CN109216797A (en) * | 2017-06-29 | 2019-01-15 | 青岛恒金源电子科技有限公司 | A kind of operation method of Li-ion batteries piles |
| CN109936189A (en) * | 2016-07-08 | 2019-06-25 | 卓尔悦欧洲控股有限公司 | Equalization charging circuit, the devices and methods therefor of series-connected cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647316A (en) * | 2013-12-03 | 2014-03-19 | 深圳市雅格朗电子有限公司 | Serially-connected lithium battery set power supply equalization management system |
| CN103647316B (en) * | 2013-12-03 | 2016-01-06 | 深圳市雅格朗电子有限公司 | A kind of serial lithium battery group power supply equalization management system |
| CN109936189A (en) * | 2016-07-08 | 2019-06-25 | 卓尔悦欧洲控股有限公司 | Equalization charging circuit, the devices and methods therefor of series-connected cell |
| CN109936189B (en) * | 2016-07-08 | 2023-07-28 | 卓尔悦欧洲控股有限公司 | Equalizing charge circuit, device and method for series battery |
| CN109216797A (en) * | 2017-06-29 | 2019-01-15 | 青岛恒金源电子科技有限公司 | A kind of operation method of Li-ion batteries piles |
| CN111181548A (en) * | 2020-01-16 | 2020-05-19 | 山东美创生物科技股份有限公司 | Counting and sampling circuit for mosquito killing equipment |
| CN111181548B (en) * | 2020-01-16 | 2022-11-22 | 山东美创生物科技股份有限公司 | Counting and sampling circuit for mosquito killing equipment |
| CN112033455A (en) * | 2020-07-29 | 2020-12-04 | 国网浙江桐乡市供电有限公司 | Machine room UPS detection system and method |
| CN112033455B (en) * | 2020-07-29 | 2022-05-13 | 国网浙江桐乡市供电有限公司 | Machine room UPS detection system and method |
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