CN201758299U - Charge-discharge automatic balancing lithium-ion power series battery - Google Patents
Charge-discharge automatic balancing lithium-ion power series battery Download PDFInfo
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- CN201758299U CN201758299U CN2010202911567U CN201020291156U CN201758299U CN 201758299 U CN201758299 U CN 201758299U CN 2010202911567 U CN2010202911567 U CN 2010202911567U CN 201020291156 U CN201020291156 U CN 201020291156U CN 201758299 U CN201758299 U CN 201758299U
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Abstract
The utility model relates to a lithium-ion power battery, in particular to a charge-discharge automatic balancing lithium-ion power series battery. Main battery cells (1-1) of all single lithium-ion power batteries (1) are serially connected in the utility model; balancing battery cells (1-2) and a chip (9) are further included; each main battery cell (1-1) of each single lithium-ion power battery (1) and each balancing battery cell (1-2) share the same positive pole; a charging control circuit (3) and a discharging control circuit (4) are respectively arranged between each main battery cell (1-1) of each single lithium-ion power battery (1) and each balancing battery cell (1-2); and an overcharge and over-discharge protection circuit (5) is respectively arranged on the main battery cell (1-1) of each single lithium-ion power battery (1). The utility model has another scheme that each main battery cell (1-1) of each single lithium-ion power battery (1) and each balancing battery cell (1-2) share the same negative pole. The utility model has the advantages of long service life, high charge-discharge efficiency and low cost, thereby realizing true automatic balancing.
Description
Technical field
The utility model relates to a kind of lithium-ion-power cell, and particularly a kind of lithium-ion-power cell series battery of charging-discharging automatic balancing belongs to the electrokinetic cell field.
Background technology
Lithium-ion-power cell application at present is very extensive, and it can be applicable to a lot of fields such as various electric tools, electric bicycle, battery-operated motor cycle, electric automobile.The little power source for power supply of lithium-ion-power cell uses behind the composition lithium-ion-power cell series battery that usually several monomer lithium-ion-power cells is together in series in actual applications, in groups to satisfy the requirement of distinct device required voltage and power; While there are differences this actual conditions based on charge-discharge characteristic and each cell of lithium-ion-power cell in actual use, need carry out balanced control to the indivedual monomer lithium-ion-power cells in the lithium-ion-power cell series battery, the battery coupling is unbalance in the solution lithium-ion-power cell series battery, just solve in the lithium-ion-power cell series battery inconsistent problem between each cell, thereby avoid because the battery pack early failure that super-charge super-discharge caused of indivedual monomer lithium-ion-power cells, make its performance as far as possible near the average level of monomer lithium-ion-power cell, therefore balanced control is crucial for the lithium-ion-power cell series battery.
Usually to call the battery coupling unbalance for the phenomenon that reduces of the battery performance that the performance difference because of the monomer lithium-ion-power cell is caused, in most cases, cause that the unbalance reason of coupling is the imperfection of cell making process and detection means, rather than the chemical attribute of lithium-ion-power cell itself changes.Even detecting classification after producing the monomer lithium-ion-power cell makes up again, the balance phenomenon that the battery coupling also can occur, as: the self-discharge rate difference of each cell causes the capacity of battery in the process of shelving unbalance, and the resistance difference causes that indivedual cells overcharge etc. between the cell in the batteries charging process.
Battery mates two aspects of unbalance main performance: be that battery charge state is unbalance on the one hand, promptly the capacity of all cells is identical, but is becoming Battery pack to make or shelving in the process state-of-charge difference of monomer; Second aspect is the unbalance of battery capacity or energy.
In order to improve the electrical property of lithium-ion-power cell series battery, make unmatched monomer lithium-ion-power cell reach same state-of-charge, require the charge volume and the discharge capacity of some monomer lithium-ion-power cells more than other battery, so will increase balanced management system to battery pack, battery pack is carried out equilibrium control, and this balanced management system is to realize by capacity minimum or the bigger cell that is charged to ceiling voltage earlier of internal resistance are shunted.Common shunt circuit is that a power transistor and current-limiting resistance series connection are arranged, compose in parallel with cell again, power controlling transistor turns in charging process, current segment shunting with high-voltage battery, thereby make its charging rate slower, the cell load that conducting power transistor in discharge process, increase capacity are big slightly, voltage is high slightly than other battery, make its velocity of discharge faster, thereby realize equalization discharge than other battery.This BMS balanced management system also includes reference circuit, voltage stabilizing circuit and temperature switch, provides the sampling reference data by reference circuit, makes output voltage stabilization by voltage stabilizing circuit, realizes temperature protection control by temperature switch.If the excessive power consumption of this BMS balanced management system euqalizing current can be very big, cause that battery pack heats up or increase element burden, opposite, if euqalizing current is too small, just need long period or a plurality of cycle just can play proportionality action, thereby reduce charge efficiency, even the meaning of effect out of balance.
Because no matter the lithium-ion-power cell series battery is domestic or external at present, what adopt substantially all is that above-mentioned balanced management system carries out equilibrium control, after having caused existing lithium-ion-power cell in groups, this charges and discharge the cycle life that charges and discharge that cycle life is significantly less than cell, that is to say that existing balanced control can't solve the power lithium-ion battery series connection problem of back battery consistency in groups, the solution power lithium-ion battery series connection conforming problem of back battery in groups is an insurmountable world-famous puzzle at present, also is the bottleneck technology and the key technology of power lithium-ion battery group technology.Why the power lithium-ion battery series connection consistency of back battery in groups is difficult to solve, its reason mainly is: (1) each cell capacity is inconsistent to be the base attribute of battery technology, even dispose good battery pack, after after a while, can occur unbalanced again; (2) electric motor car after the large-scale production etc. is impossible adopt equalization charging or passive balancer to realize harmonious the maintenance.Because existing this balanced management system makes a certain cell capacity minimum all the time, put when overcharging, crossing, during balanced shunting, shallowly fill, shallow putting, this causes this cell deterioration to circulate until the early stage decay of its capacity and makes whole battery group early failure, shorten the useful life of battery pack greatly, for example: lithium manganate battery, cell cycle life are 600 times, and the actual battery group is used 300～400 times.Ferric phosphate lithium cell cell cycle life is 2000 times, and actual one-tenth Battery pack uses 1000～1200 times.Moreover existing this balanced management system complex structure, connecting line are numerous, if any 100 cell series connection, just there are 101 lines to be connected with balanced management system, any single line goes wrong and all can cause fault, so the failure rate height, reliability is poor, costs an arm and a leg, lithium-ion-power cell series battery low capacity is in hundreds of unit, big capacity such as used for electric vehicle price units up to ten thousand.
In the lithium-ion-power cell series battery between each cell conforming perfect condition be: the capacity of all cells is all identical with state-of-charge in the battery pack, or the capacity difference of cell, but the state-of-charge of cell is identical.
The above conventional equilibrium control of adopting, can't solve the capacity consistency problem of each cell in the lithium-ion-power cell series battery, just solved the state-of-charge consistency problem of each cell, and solve also not ideal enough, still exist above-mentioned many defectives.Therefore can't reach in the lithium-ion-power cell series battery conforming perfect condition between each cell.
The utility model content
The purpose of this utility model is at the deficiencies in the prior art, provide a kind of capacity that can make into each cell of Battery pack all consistent with state-of-charge, battery pack always works in perfect condition, the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing that simple in structure, long service life, efficiency for charge-discharge height, cost are low, reliable and stable.
The technical scheme that realizes above-mentioned purpose is: a kind of lithium-ion-power cell series battery of charging-discharging automatic balancing; form by several monomer lithium-ion-power cells; each monomer lithium-ion-power cell includes main electric core; the electric core of the master of each monomer lithium-ion-power cell is cascaded; each monomer lithium-ion-power cell is provided with reference circuit; voltage stabilizing circuit and temperature switch; each monomer lithium-ion-power cell also includes balanced electric core and chip; electric core of the master of each monomer lithium-ion-power cell and balanced electric core are anodal altogether; between electric core of the master of each monomer lithium-ion-power cell and balanced electric core, be provided with charging control circuit; between electric core of the master of each monomer lithium-ion-power cell and balanced electric core, also be provided with charge/discharge control circuit; also be provided with the super-charge super-discharge protective circuit on the electric core of the master of each monomer lithium-ion-power cell; the super-charge super-discharge protective circuit is made up of overcharge protection circuit and over-discharge protection circuit, wherein:
A) charging control circuit is made up of charging control section branch and charging sampling section, and the charging control section branch is arranged between main electric core negative pole and the balanced electric core negative pole, and is connected with chip output; The charging sampling section is connected with the chip input;
B) charge/discharge control circuit is made up of discharge control section and discharge sampling section, and the discharge control section is arranged between main electric core negative pole and the balanced electric core negative pole, and is connected with chip output; The discharge sampling section is connected with the chip input;
C) overcharge protection circuit is formed by overcharging control section and overcharging sampling section, overcharges control section and is connected with chip output, overcharges sampling section and is connected with the chip input;
D) over-discharge protection circuit is put sampling section and is formed by crossing to put control section and to cross, cross to put control section and be connected with chip output, put sampling section and be connected with the chip input;
E) VCC of reference circuit end is connected with the VCC end of chip, and the GND end of chip is connected with main electric core negative pole, and the VREF end of reference circuit is connected with the VREF end of chip;
F) VCC of voltage stabilizing circuit end is connected with the VCC end of chip, and the anodal and main electric core positive pole of voltage stabilizing circuit is connected, and the voltage stabilizing circuit negative pole is connected with main electric core negative pole.
The lithium-ion-power cell series battery of another charging-discharging automatic balancing of the utility model; form by several monomer lithium-ion-power cells; each monomer lithium-ion-power cell includes main electric core; the electric core of the master of each monomer lithium-ion-power cell is cascaded; each monomer lithium-ion-power cell is provided with reference circuit; voltage stabilizing circuit and temperature switch; each monomer lithium-ion-power cell also includes balanced electric core and chip; electric core of the master of each monomer lithium-ion-power cell and balanced electric core be negative pole altogether; between electric core of the master of each monomer lithium-ion-power cell and balanced electric core, be provided with charging control circuit; between electric core of the master of each monomer lithium-ion-power cell and balanced electric core, also be provided with charge/discharge control circuit; also be provided with the super-charge super-discharge protective circuit on the electric core of the master of each monomer lithium-ion-power cell; the super-charge super-discharge protective circuit is made up of overcharge protection circuit and over-discharge protection circuit, wherein:
A) charging control circuit is made up of charging control section branch and charging sampling section, and the charging control section branch is arranged between main electric core positive pole and the balanced electric core positive pole, and is connected with chip output; The charging sampling section is connected with the chip input;
B) charge/discharge control circuit is made up of discharge control section and discharge sampling section, and the discharge control section is arranged between main electric core positive pole and the balanced electric core positive pole, and is connected with chip output; The discharge sampling section is connected with the chip input;
C) overcharge protection circuit is formed by overcharging control section and overcharging sampling section, overcharges control section and is connected with chip output, overcharges sampling section and is connected with the chip input;
D) over-discharge protection circuit is put sampling section and is formed by crossing to put control section and to cross, cross to put control section and be connected with chip output, put sampling section and be connected with the chip input;
E) VCC of reference circuit end is connected with the VCC end of chip, and the GND end of chip is connected with main electric core positive pole, and the VREF end of reference circuit is connected with the VREF end of chip;
F) VCC of voltage stabilizing circuit end is connected with the VCC end of chip, and the anodal and main electric core positive pole of voltage stabilizing circuit is connected, and the voltage stabilizing circuit negative pole is connected with main electric core negative pole.
Further, the model of described chip is MCP6544.
Further, the charging control section branch in the described charging control circuit includes resistance R 23, resistance R 14, resistance R 8, resistance R 1 and power tube Q1, and the charging sampling section includes resistance R 19, resistance R 17 and capacitor C 5.
Further, the discharge control section in the described charge/discharge control circuit includes resistance R 13, diode D1, resistance R 18 and power tube Q2, and the discharge sampling section includes resistance R 7, resistance R 16 and capacitor C 6.
Further, the control section that overcharges in the described overcharge protection circuit includes resistance R 2, power tube and resistance R 22, overcharges sampling section and includes resistance R 6, resistance R 27 and capacitor C 3.
Further, the mistake in the described over-discharge protection circuit is put control section and is included resistance R 3, resistance R 4, resistance R 9 and light coupling relay, and putting sampling section includes resistance R 5, resistance R 10 and capacitor C 1 excessively.
Further, described light coupling relay model is PC817.
After adopting technique scheme; have a lot of benefits: the utility model is on the basis that the electric core of master of each monomer lithium-ion-power cell of lithium-ion-power cell series battery is cascaded; on each monomer lithium-ion-power cell, increased balanced electric core; electric core of the master of each monomer lithium-ion-power cell and balanced electric core anodal altogether (perhaps being total to negative pole); between electric core of the master of each monomer lithium-ion-power cell and balanced electric core, charging control circuit and charge/discharge control circuit are set; on the electric core of the master of each monomer lithium-ion-power cell the super-charge super-discharge protective circuit is set also, the super-charge super-discharge protective circuit is made up of overcharge protection circuit and over-discharge protection circuit.Defectives such as the cost height that the utility model has been avoided prior art balanced management system complex structure, connecting line is numerous and cause, poor reliability, cost height, the utility model has solved the balanced in groups key technology of power lithium-ion battery, and the utility model has solved this insurmountable always difficult problem of lithium-ion-power cell series battery consistency with simple parts and circuit.Realize in the utility model that the cost of each monomer lithium-ion-power cell of automatic equalization only increases the cost of several units, the utility model is used in the cost of realizing automatic equalization on up to a hundred the monomer lithium-ion-power cell series batteries and has only more than 1,000 yuan, and prior art is used in up to a hundred the balanced management system costs on the monomer lithium-ion-power cell series battery and wants units up to ten thousand, as seen the utility model cost reduces greatly, and structure of the present utility model makes pipeline significantly reduce, the cost performance height, structure is very simple, be difficult for breaking down, reliability is good.It is all consistent with state-of-charge that the utility model makes into the capacity of each cell of Battery pack, battery pack always works in perfect condition, has realized real automatic equalization, and battery pack charges and discharge cycle life and reaches the mean value that each cell charges and discharge cycle life, long service life, the efficiency for charge-discharge height.Existing lithium-ion-power cell (LiFePO
4) cell charge and discharge cycle life 〉=2000 time, and its lithium-ion-power cell series battery charge and discharge cycle life≤1200 time, series connection the charging and discharging circulation and can only reach 60% of cell of back battery in groups as can be seen, after adopting the technical solution of the utility model, the cycle life that charges and discharge of lithium-ion-power cell series battery has reached the mean value that cell charges and discharge cycle life fully, the lithium-ion-power cell series battery charge and discharge cycle life 〉=1800 time.The utility model makes into that the capacity of each cell of Battery pack is all consistent with state-of-charge, and battery pack always works in perfect condition, and is simple in structure, long service life, and the efficiency for charge-discharge height, cost is low, and is reliable and stable.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is the circuit diagram of the utility model embodiment one;
Fig. 3 is the main TV structure schematic diagram of part 1 monomer lithium-ion-power cell among the utility model embodiment one;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the F-F cutaway view of Fig. 4;
Fig. 6 is the main TV structure schematic diagram behind part 1-1 master electricity core and the balanced electric core lamination of part 1-2 among Fig. 3;
Fig. 7 is the main TV structure schematic diagram of the negative plate of part 1-1 master electricity core among Fig. 3;
Fig. 8 is the main TV structure schematic diagram of the negative plate of the balanced electric core of part 1-2 among Fig. 3;
Fig. 9 is the main TV structure schematic diagram of part 1-1 master electricity core and the shared positive plate of the balanced electric core of part 1-2 among Fig. 3;
Figure 10 is the structural representation of the utility model embodiment two.
In the accompanying drawing: the resistance value back unit of mark among Fig. 2, its unit is Ω.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Embodiment one
Extremely shown in Figure 9 as Fig. 1, a kind of lithium-ion-power cell series battery of charging-discharging automatic balancing, form by several monomer lithium-ion-power cells 1, each monomer lithium-ion-power cell 1 includes main electric core 1-1, the electric core 1-1 of the master of each monomer lithium-ion-power cell 1 is cascaded, each monomer lithium-ion-power cell 1 is provided with reference circuit 6, voltage stabilizing circuit 7 and temperature switch 8, each monomer lithium-ion-power cell 1 also includes balanced electric core 1-2 and chip 9, electric core 1-1 of the master of each monomer lithium-ion-power cell 1 and balanced electric core 1-2 be anodal B+ altogether, be the electric core 1-1 of master and the shared same anodal B+ of balanced electric core 1-2 of each monomer lithium-ion-power cell 1, negative pole divides two, one is main electric core 1-1 negative pole S-, and another is balanced electric core 1-2 negative pole B-.Between electric core 1-1 of the master of each monomer lithium-ion-power cell 1 and balanced electric core 1-2, be provided with charging control circuit 3; between electric core 1-1 of the master of each monomer lithium-ion-power cell 1 and balanced electric core 1-2, also be provided with charge/discharge control circuit 4; also be arranged in parallel super-charge super-discharge protective circuit 5 on the electric core 1-1 of the master of each monomer lithium-ion-power cell 1; super-charge super-discharge protective circuit 5 is made up of overcharge protection circuit 5-1 and over-discharge protection circuit 5-2, reference circuit 6; voltage stabilizing circuit 7; charging control circuit 3; charge/discharge control circuit 4 and super-charge super-discharge protective circuit 5 all are arranged on the battery protecting plate 12.Wherein:
A) charging control circuit 3 divides 3-1 and charging sampling section 3-2 to form by charging control section, charging control section divides 3-1 to be arranged between main electric core 1-1 negative pole S-and the balanced electric core 1-2 negative pole B-, and is connected with chip 9 output OUT3 (control output end of promptly charging) by the pin 8 of chip 9; Charging sampling section 3-2 is arranged between anodal B+ of main electric core 1-1 and the main electric core 1-1 negative pole S-, and is connected with chip 9 input IN3+ (i.e. charging sampling input) by the pin 10 of chip 9;
B) charge/discharge control circuit 4 is made up of discharge control section 4-1 and discharge sampling section 4-2, discharge control section 4-1 is arranged between main electric core 1-1 negative pole S-and the balanced electric core 1-2 negative pole B-, and is connected with chip 9 output OUT2 (control output end of promptly discharging) by the pin 7 of chip 9; Discharge sampling section 4-2 is arranged between anodal B+ of main electric core 1-1 and the main electric core 1-1 negative pole S-, and is connected with chip 9 input IN2-(i.e. discharge sampling input) by the pin 6 of chip 9;
C) overcharge protection circuit 5-1 forms by overcharging control section 5-1-1 and overcharging sampling section 5-1-2, overcharging the pin 14 of control section 5-1-1 by chip 9 is connected with chip 9 output OUT4 (promptly overcharging the control output end), overcharge sampling section 5-1-2 and be arranged between anodal B+ of main electric core 1-1 and the main electric core 1-1 negative pole S-, and be connected with chip 9 input IN4+ (promptly overcharging the sampling input) by the pin 12 of chip 9;
D) over-discharge protection circuit 5-2 forms by putting control section 5-2-1 excessively and putting sampling section 5-2-2 excessively, cross and put the pin 1 of control section 5-2-1 by chip 9 and be connected with chip 9 output OUT1 (promptly cross and put the control output end), cross and put sampling section 5-2-2 and be arranged between anodal B+ of main electric core 1-1 and the main electric core 1-1 negative pole S-, and the pin 2 by chip 9 and chip 9 input IN1-(promptly put the input of sampling) are connected;
E) VCC of reference circuit 6 end is connected with the VCC end of chip 9 by the pin 4 of chip 9, and the VCC end of reference circuit 6 is supply power voltage ends of circuit.The GND end of chip 9 is connected with main electric core 1-1 negative pole S-by pin 11, thereby provides operating voltage by chip VCC end and GND end for chip 9.The VREF end of reference circuit 6 is reference voltage terminals of circuit, for overcharge protection circuit 5-1, over-discharge protection circuit 5-2, charging control circuit 3 and the charge/discharge control circuit 4 four tunnel that is connected with chip 9 provides reference voltage.The VREF end of reference circuit 6 is connected with four VREF ends of chip 9, and in four VREF ends that promptly link to each other with chip 9, first VREF end is connected with the IN3-end of chip 9 by pin 9, is in series with resistance R 20 between the IN3-end of first VREF end and chip 9; Second VREF end is connected with the IN2+ end of chip 9 by pin 5, is in series with resistance R 12 between the IN2+ of second VREF end and chip 9 holds; The 3rd VREF end is connected with the IN4-end of chip 9 by pin 13, is in series with resistance R 21 between the IN4-of the 3rd VREF end and chip 9 holds; The 4th VREF end is connected with the IN1+ end of chip 9 by pin 3, is in series with resistance R 11 between the IN1+ of the 4th VREF end and chip 9 holds.
F) VCC of voltage stabilizing circuit 7 end is connected with the VCC end of chip 9 by the pin 4 of chip 9, and voltage stabilizing circuit 7 anodal B+ are connected with the anodal B+ of main electric core 1-1, and voltage stabilizing circuit 7 negative pole S-are connected with main electric core 1-1 negative pole S-.
The model of chip described in the present embodiment 9 is MCP6544.
Charging control section in the charging control circuit 3 described in the present embodiment divides 3-1 to include resistance R 23, resistance R 14, resistance R 8, resistance R 1 and power tube Q1, and charging sampling section 3-2 includes resistance R 19, resistance R 17 and capacitor C 5.Power tube Q1 is a high-power MOS tube.Charging sampling section 3-2 plays sampling action, and charging control section divides 3-1 to play the charging control action.
Discharge control section 4-1 in the charge/discharge control circuit 4 described in the present embodiment includes resistance R 13, diode D1, resistance R 18 and power tube Q2, and discharge sampling section 4-2 includes resistance R 7, resistance R 16 and capacitor C 6.Power tube Q2 is a high-power MOS tube.Discharge sampling section 4-2 plays sampling action, and discharge control section 4-1 plays the charging control action.
The control section 5-1-1 that overcharges among the overcharge protection circuit 5-1 described in the present embodiment includes resistance R 2, power tube 10 and resistance R 22, overcharges sampling section 5-1-2 and includes resistance R 6, resistance R 27 and capacitor C 3.Power tube 10 is the small-power power tube.Overcharge sampling section 5-1-2 and play sampling action, rise and overcharge control action and overcharge control section 5-1-1.
Mistake among the over-discharge protection circuit 5-2 described in the present embodiment is put control section 5-2-1 and is included resistance R 3, resistance R 4, resistance R 9 and light coupling relay 11, and putting sampling section 5-2-2 includes resistance R 5, resistance R 10 and capacitor C 1 excessively.Light coupling relay 11 models are CP817.Cross and put sampling section 5-2-2 and play sampling action, put control section 5-2-1 and rose and put control action and cross.Light coupling relay 11 is provided with two in the present embodiment, be convenient when putting output point A and B wiring for two mistakes that light coupling relay 11 is connected, needn't consider directivity when making output point A and B wiring,, still can keep light coupling relay 11 operate as normal no matter whether connect instead.
Embodiment two
As shown in figure 10, present embodiment is another technical scheme of the present utility model, present embodiment and embodiment one are basic identical, that different is the electric core 1-1 of master and the common negative pole S-of balanced electric core 1-2 of each monomer lithium-ion-power cell 1, be the electric core 1-1 of master and the shared same negative pole S-of balanced electric core 1-2 of each monomer lithium-ion-power cell 1, two of anodal branches, one is the anodal B+ of main electric core 1-1, another is the anodal S+ of balanced electric core 1-2.Charging control section divides 3-1 to be arranged between anodal B+ of main electric core 1-1 and the anodal S+ of balanced electric core 1-2, discharge control section 4-1 is arranged between anodal B+ of main electric core 1-1 and the anodal S+ of balanced electric core 1-2, the GND end of chip 9 is connected with the anodal B+ of main electric core 1-1, and the model of chip 9, power tube Q1, power tube Q1 and power tube 10 is done corresponding adjustment and got final product.Because the electric core 1-1 of master and the shared negative pole of balanced electric core 1-2 of each monomer lithium-ion-power cell 1 in the present embodiment, present embodiment is compared with embodiment one, functional effect is all very good, but the cost of present embodiment is higher than embodiment one, thereby embodiment one is better than embodiment two.
The safe temperature that the utility model is set is 55 ℃, and 〉=55 ℃ of temperature switches 8 disconnect.It is 2.5V that the mistake that the utility model is set is put protection voltage, and output low pressure is crossed discharge signal when the utility model voltage≤2.5V; The over-charge protective voltage that the utility model is set is 3.8V, starts the over-charge protective leakage current when the utility model voltage 〉=3.8V; When the utility model voltage 〉=3.75V, start balanced electric core 1-2 charge tunnel, and when the utility model voltage≤3.65V, turn-off balanced electric core 1-2 charge tunnel; When the utility model voltage≤3.0V, start balanced electric core 1-2 discharge channel.The reference voltage that the utility model is set, only needs just can reach needed reference voltage level by R17, the R16, R27 and the R10 resistance that change in the sample circuit at 2V～5V when needs change reference voltage.
Now with monomer lithium ion battery 100Ah (LiFePO
4) operation principle of the present utility model is described for example.Because the unsteadiness of manufacture craft and batches of materials, the finished product error rate of cell is 2%～5%, is set in ± 2% calculating by error rate now, that is to say into that capacity is 98Ah～102Ah between each monomer of Battery pack.Be designed to total capacity 104Ah during design 100Ah battery battery core, main electric core 1-1 is designed to 100Ah, and balanced electric core 1-2 is designed to 4Ah, and main electric core 1-1 and balanced electric core 1-2 are anodal altogether, and main certainly electric core 1-1 and balanced electric core 1-2 also can be total to negative pole.Charging control circuit 3 and charge/discharge control circuit 4 are controlled charged state and discharge condition respectively, and overcharge protection circuit 5-1 and over-discharge protection circuit 5-2 control respectively and overcharge and cross the state of putting.During charging, main electric core 1-1 voltage at first to occur higher when the minimum battery of some cell capacity or the higher battery of internal resistance, when voltage reaches 3.75V, the charging current shunting circuit charges to the electric core 1-2 of equilibrium by power tube Q1, at this moment main electric core 1-1 terminal voltage can slowly drop to 3.65V, 3.65V be the battery standard charging voltage, when the sample circuit sampling reaches 3.65V, power controlling pipe Q1 turn-offs, balanced electric core 1-2 charging is interrupted, at this moment the energy that charges into balanced electric core 1-2 is the capacity of first equalization cycle charging active correction, may occur repeatedly such partial circulating later on, finally when the voltage of the main electric core 1-1 of all series connection all remained on 3.65V, the charger charge circuit turn-offed, charging finishes, and at this moment the energy that balanced electric core 1-2 charges in each cell is the capacity error rate of each cell.During discharge, discharge control loop samples main electric core 1-1 terminal voltage when 3.0V, control discharge loop power tube Q2 conducting, with energy among the electric core 1-2 of equilibrium and main electric core 1-1 parallel discharge, energy in the cell capacity error is replenished, and the energy that reaches each cell discharge of series-connected cell equates.So circulation goes round and begins again, keep no matter charging, discharging between each monomer of series-connected cell in groups always, remain balanced at the mean value of series-connected cell capacity in groups, reach cell and charge and discharge cycle life, and make in groups that series-connected cell does not have the balanced energy loss when equilibrium, improved efficiency for charge-discharge.
Claims (8)
1. the lithium-ion-power cell series battery of a charging-discharging automatic balancing; form by several monomer lithium-ion-power cells (1); each monomer lithium-ion-power cell (1) includes main electric core (1-1); the electric core of master (1-1) of each monomer lithium-ion-power cell (1) is cascaded; each monomer lithium-ion-power cell (1) is provided with reference circuit (6); voltage stabilizing circuit (7) and temperature switch (8); it is characterized in that: each monomer lithium-ion-power cell (1) also includes balanced electric core (1-2) and chip (9); the electric core of master (1-1) of each monomer lithium-ion-power cell (1) and balanced electric core (1-2) are anodal altogether; between the electric core of master (1-1) of each monomer lithium-ion-power cell (1) and balanced electric core (1-2), be provided with charging control circuit (3); between the electric core of master (1-1) of each monomer lithium-ion-power cell (1) and balanced electric core (1-2), also be provided with charge/discharge control circuit (4); also be provided with super-charge super-discharge protective circuit (5) on the electric core of master (1-1) of each monomer lithium-ion-power cell (1); super-charge super-discharge protective circuit (5) is made up of overcharge protection circuit (5-1) and over-discharge protection circuit (5-2), wherein:
A) charging control circuit (3) is made up of charging control section branch (3-1) and charging sampling section (3-2), and charging control section branch (3-1) is arranged between main electric core (1-1) negative pole and balanced electric core (1-2) negative pole, and is connected with chip (9) output; Charging sampling section (3-2) is connected with chip (9) input;
B) charge/discharge control circuit (4) is made up of discharge control section (4-1) and discharge sampling section (4-2), and discharge control section (4-1) is arranged between main electric core (1-1) negative pole and balanced electric core (1-2) negative pole, and is connected with chip (9) output; Discharge sampling section (4-2) is connected with chip (9) input;
C) overcharge protection circuit (5-1) is formed by overcharging control section (5-1-1) and overcharging sampling section (5-1-2), overcharges control section (5-1-1) and is connected with chip (9) output, overcharges sampling section (5-1-2) and is connected with chip (9) input;
D) over-discharge protection circuit (5-2) is put sampling section (5-2-2) and is formed by crossing to put control section (5-2-1) and to cross, and mistake is put control section (5-2-1) and is connected with chip (9) output, and mistake is put sampling section (5-2-2) and is connected with chip (9) input;
E) VCC of reference circuit (6) end is connected with the VCC end of chip (9), and the GND end of chip (9) is connected with main electric core (1-1) negative pole, and the VREF end of reference circuit (6) is connected with the VREF end of chip (9);
F) VCC of voltage stabilizing circuit (7) end is connected with the VCC end of chip (9), and anodal and main electric core (1-1) positive pole of voltage stabilizing circuit (7) is connected, and voltage stabilizing circuit (7) negative pole is connected with main electric core (1-1) negative pole.
2. the lithium-ion-power cell series battery of a charging-discharging automatic balancing; form by several monomer lithium-ion-power cells (1); each monomer lithium-ion-power cell (1) includes main electric core (1-1); the electric core of master (1-1) of each monomer lithium-ion-power cell (1) is cascaded; each monomer lithium-ion-power cell (1) is provided with reference circuit (6); voltage stabilizing circuit (7) and temperature switch (8); it is characterized in that: each monomer lithium-ion-power cell (1) also includes balanced electric core (1-2) and chip (9); the electric core of master (1-1) of each monomer lithium-ion-power cell (1) and balanced electric core (1-2) be negative pole altogether; between the electric core of master (1-1) of each monomer lithium-ion-power cell (1) and balanced electric core (1-2), be provided with charging control circuit (3); between the electric core of master (1-1) of each monomer lithium-ion-power cell (1) and balanced electric core (1-2), also be provided with charge/discharge control circuit (4); also be provided with super-charge super-discharge protective circuit (5) on the electric core of master (1-1) of each monomer lithium-ion-power cell (1); super-charge super-discharge protective circuit (5) is made up of overcharge protection circuit (5-1) and over-discharge protection circuit (5-2), wherein:
A) charging control circuit (3) is made up of charging control section branch (3-1) and charging sampling section (3-2), and charging control section branch (3-1) is arranged between main electric core (1-1) positive pole and balanced electric core (1-2) positive pole, and is connected with chip (9) output; Charging sampling section (3-2) is connected with chip (9) input;
B) charge/discharge control circuit (4) is made up of discharge control section (4-1) and discharge sampling section (4-2), and discharge control section (4-1) is arranged between main electric core (1-1) positive pole and balanced electric core (1-2) positive pole, and is connected with chip (9) output; Discharge sampling section (4-2) is connected with chip (9) input;
C) overcharge protection circuit (5-1) is formed by overcharging control section (5-1-1) and overcharging sampling section (5-1-2), overcharges control section (5-1-1) and is connected with chip (9) output, overcharges sampling section (5-1-2) and is connected with chip (9) input;
D) over-discharge protection circuit (5-2) is put sampling section (5-2-2) and is formed by crossing to put control section (5-2-1) and to cross, and mistake is put control section (5-2-1) and is connected with chip (9) output, and mistake is put sampling section (5-2-2) and is connected with chip (9) input;
E) VCC of reference circuit (6) end is connected with the VCC end of chip (9), and the GND end of chip (9) is connected with main electric core (1-1) positive pole, and the VREF end of reference circuit (6) is connected with the VREF end of chip (9);
F) VCC of voltage stabilizing circuit (7) end is connected with the VCC end of chip (9), and anodal and main electric core (1-1) positive pole of voltage stabilizing circuit (7) is connected, and voltage stabilizing circuit (7) negative pole is connected with main electric core (1-1) negative pole.
3. the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing according to claim 1 and 2, it is characterized in that: the model of described chip (9) is MCP6544.
4. the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing according to claim 1 and 2, it is characterized in that: the charging control section branch (3-1) in the described charging control circuit (3) includes resistance R 23, resistance R 14, resistance R 8, resistance R 1 and power tube Q1, and charging sampling section (3-2) includes resistance R 19, resistance R 17 and capacitor C 5.
5. the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing according to claim 1 and 2, it is characterized in that: the discharge control section (4-1) in the described charge/discharge control circuit (4) includes resistance R 13, diode D1, resistance R 18 and power tube Q2, and discharge sampling section (4-2) includes resistance R 7, resistance R 16 and capacitor C 6.
6. the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing according to claim 1 and 2; it is characterized in that: the control section (5-1-1) that overcharges in the described overcharge protection circuit (5-1) includes resistance R 2, power tube (10) and resistance R 22, overcharges sampling section (5-1-2) and includes resistance R 6, resistance R 27 and capacitor C 3.
7. the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing according to claim 1 and 2; it is characterized in that: the mistake in the described over-discharge protection circuit (5-2) is put control section (5-2-1) and is included resistance R 3, resistance R 4, resistance R 9 and light coupling relay (11), and putting sampling section (5-2-2) includes resistance R 5, resistance R 10 and capacitor C 1 excessively.
8. the lithium-ion-power cell series battery of a kind of charging-discharging automatic balancing according to claim 7, it is characterized in that: described light coupling relay (11) model is PC817.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202911567U CN201758299U (en) | 2010-08-13 | 2010-08-13 | Charge-discharge automatic balancing lithium-ion power series battery |
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| CN2010202911567U CN201758299U (en) | 2010-08-13 | 2010-08-13 | Charge-discharge automatic balancing lithium-ion power series battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122836A (en) * | 2011-04-01 | 2011-07-13 | 北京航空航天大学 | Charging/discharging active equalization circuit for lithium ion power battery pack |
| CN102376989A (en) * | 2010-08-13 | 2012-03-14 | 周金平 | Serially-connected battery pack of lithium ion power battery with automatic equalization of charging and discharging |
| CN102738872A (en) * | 2011-04-08 | 2012-10-17 | 郑佩尧 | Separately-charging battery charger |
| CN109216802A (en) * | 2018-09-14 | 2019-01-15 | 合肥众禾动力新能源科技有限公司 | A kind of battery of electric vehicle module |
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2010
- 2010-08-13 CN CN2010202911567U patent/CN201758299U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102376989A (en) * | 2010-08-13 | 2012-03-14 | 周金平 | Serially-connected battery pack of lithium ion power battery with automatic equalization of charging and discharging |
| CN102122836A (en) * | 2011-04-01 | 2011-07-13 | 北京航空航天大学 | Charging/discharging active equalization circuit for lithium ion power battery pack |
| CN102122836B (en) * | 2011-04-01 | 2014-06-18 | 北京航空航天大学 | Charging/discharging active equalization circuit for lithium ion power battery pack |
| CN102738872A (en) * | 2011-04-08 | 2012-10-17 | 郑佩尧 | Separately-charging battery charger |
| CN109216802A (en) * | 2018-09-14 | 2019-01-15 | 合肥众禾动力新能源科技有限公司 | A kind of battery of electric vehicle module |
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