CN104158245B - A kind of lithium battery pack equalizing circuit of composite type and equalization methods - Google Patents
A kind of lithium battery pack equalizing circuit of composite type and equalization methods Download PDFInfo
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- CN104158245B CN104158245B CN201410384908.7A CN201410384908A CN104158245B CN 104158245 B CN104158245 B CN 104158245B CN 201410384908 A CN201410384908 A CN 201410384908A CN 104158245 B CN104158245 B CN 104158245B
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Abstract
The invention discloses a kind of lithium battery pack equalizing circuit and equalization methods of composite type, lithium battery pack equalizing circuit battery B1, battery B2 and battery B3; Described lithium battery pack equalizing circuit comprises A/D sampling module, electric capacity C1-C3, electric capacity C4, resistance R1-R5, diode D1, diode D2, battery B1-B3, inductance L 1, inductance L 2, switching tube Q1-Q3, unit switch pipe Q4-Q6, optocoupler 1, optocoupler 2, optocoupler 3.Electric energy is carried out equilibrium to next adjacent joint transfer by inductance coil by the battery that in lithium battery group, non-final one saves, and unnecessary electric energy is carried out equilibrium by resistive dissipation by the final section in lithium battery group.The lithium battery pack equalizing circuit of composite type of the present invention and equalization methods, have the advantages such as the consistency that structure is simple, transfer scale is controlled, efficiency is high, be conducive to improving battery pack.
Description
Technical field
The present invention relates to a kind of lithium battery equalization scheme of composite type, especially a kind of lithium battery pack equalizing circuit of the composite type for serial lithium battery group and equalization methods.
Background technology
In new-energy automobile field, dynamic lithium battery by use of extensively connecting, for driving automobile, reclaiming braking energy etc.But battery can cause it to there is inconsistent phenomenon due to the difference in manufacturing process, by well-chosen in process in groups, selects the serial battery that consistency is good, to reduce the inconsistency of lithium battery group.But in its use procedure, owing to installing and the difference of service condition, the inconsistency difference of lithium battery group still can be caused to strengthen.If do not managed, can cause battery accelerated ageing, storage capacity reduces until scrap, and therefore, must carry out equilibrium to improve the inconsistence problems of battery to battery, improves life-span and the efficiency of lithium battery group.
For balanced management, mainly contain two kinds of technology at present, dissipativeness equilibrium and nondissipative equalization.Dissipativeness is balanced, and by the form of parallel resistance to battery discharge, fallen by the fault offset of monomer higher for energy in lithium battery group, which is simple to operate, and portfolio effect is obvious, is the most widely used method in current practical application.Nondissipative equalization is by energy storage components and parts (inductance, electric capacity), is shifted by the energy of energy compared with high monomer, supplements to the equalization methods of the lower monomer of energy.
Summary of the invention
The present invention is for avoiding the weak point that exists in above-mentioned prior art, providing a kind of lithium battery pack equalizing circuit and equalization methods of composite type, to solve the problem of inconsistency that lithium battery group in use widens gradually.
The present invention is technical solution problem, provides a kind of lithium battery pack equalizing circuit and equalization methods of composite type.
A lithium battery pack equalizing circuit for composite type, its design feature is, lithium battery group is in series by multiple batteries, comprises battery B1, battery B2 and battery B3; Described lithium battery pack equalizing circuit comprises A/D sampling module, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, diode D2, battery B1, battery B2, battery B3, inductance L 1, inductance L 2, switching tube Q1, switching tube Q2, switching tube Q3, unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6, optocoupler 1, optocoupler 2, optocoupler 3;
Described A/D sampling module meets each batteries B1, battery B2, the battery B3 of serial lithium battery group respectively, and described electric capacity C1, resistance R2 form RC low-pass filter circuit; The two ends of described resistance R1 connect negative pole and the switching tube Q1 cold end of lithium battery group respectively;
One end of described resistance R2 is connected with one end of electric capacity C1 and tie point is connected with described A/D sampling module, the other end of described resistance R2 is connected with the positive pole of battery B3 in lithium battery group, and one end of the other end of described electric capacity C1, one end of resistance R3, electric capacity C2 is connected and tie point is connected with described A/D sampling module; The other end of resistance R3 is connected with the positive pole of battery B2 in lithium battery group, and one end of the other end of electric capacity C2, one end of resistance R4, electric capacity C3 is connected and tie point is connected with described A/D sampling module; The other end of resistance R4 is connected with the positive pole of battery B1 in lithium battery group, one end of the other end of electric capacity C3, one end of resistance R5, electric capacity C4 is connected and tie point is connected with described A/D sampling module, the other end of resistance R5 is connected with the negative pole of battery B1 in lithium battery group and ground connection, the other end ground connection of electric capacity C4;
In described inductance L 1 first wiring termination serial lithium battery group, battery B1, battery B2 are connected in series point, the cold end of described inductance L 1 second wiring termination switching tube Q2; In described inductance L 2 first wiring termination serial lithium battery group, battery B2, battery B3 are connected in series point, the cold end of described inductance L 2 first wiring termination switching tube Q3;
In the high potential termination serial lithium battery group of described switching tube Q1, battery B1, battery B2 are connected in series point, in the high potential termination serial lithium battery group of described switching tube Q2, battery B2, battery B3 are connected in series point, the positive pole of battery B3 in the high potential termination serial lithium battery group of described switching tube Q3;
The binding site of the control termination unit switch pipe Q6 of described switching tube Q1, the binding site of the control termination unit switch pipe Q5 of described switching tube Q2, the binding site of the control termination unit switch pipe Q4 of described switching tube Q3, the high voltage termination battery B3 positive pole of described unit switch pipe Q4, the low-voltage termination battery B2 of described unit switch pipe Q4, battery B3 is connected in series point, the output of the control termination optocoupler 1 of described unit switch pipe Q4, the high voltage termination battery B2 of described unit switch pipe Q5, battery B3 is connected in series point, the low-voltage termination battery B1 of described unit switch pipe Q5, battery B2 is connected in series point, the output of the control termination optocoupler 2 of described unit switch pipe Q5, the high voltage termination battery B2 of described unit switch pipe Q6, battery B3 is connected in series point, the low-voltage end ground connection of described unit switch pipe Q6, the output of the control termination optocoupler 3 of described unit switch pipe Q6, described optocoupler 1, optocoupler 2, optocoupler 3 connects I/O switching signal respectively,
The negative pole of described diode D1 connects the cold end of switching tube Q2, and the positive pole of described diode D1 connects the negative pole of battery B1 in serial lithium battery group; The negative pole of described diode D2 connects the cold end of switching tube Q3, and the positive pole of described diode D2 connects the serial connection point of battery B2 in serial lithium battery group, battery B3.
The lithium battery pack equalizing circuit of a kind of composite type of the present invention also has following technical characterstic.
Described switching tube Q1, switching tube Q2, switching tube Q3 adopt P type metal-oxide-semiconductor, the grid of described P type metal-oxide-semiconductor is the control end of described switching tube, the drain electrode of described P type metal-oxide-semiconductor is the cold end of described switching tube, and the source electrode of described P type metal-oxide-semiconductor is the hot end of described switching tube.
Described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 all adopt P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor to combine; The control end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor grid tie point, the hot end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the source electrode of N-type metal-oxide-semiconductor, the cold end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the drain electrode of P type metal-oxide-semiconductor, and the binding site of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the source electrode of P type metal-oxide-semiconductor and the drain junction of N-type metal-oxide-semiconductor.
Described diode D1, D2 are fast recovery diode, and to be applicable to speed-sensitive switch requirement, and circuit loss is few.
The number of turn specification of described inductance L 1, inductance L 2 is identical.
Present invention also offers a kind of lithium battery group equalization methods of composite type.
A lithium battery group equalization methods for composite type, it comprises the steps:
Step 1: judge that battery is in the trickle charge stage or is in and leave standstill not discharge condition;
Step 2: if battery is in the trickle charge stage, judging the first the trimming threshold whether voltage of cell reaches default, if it is carry out step 3, if not then terminating; If battery is in leave standstill not discharge condition, judging the 3rd the trimming threshold whether voltage of cell reaches default, if it is carry out step 3, if not then terminating;
Step 3: judge whether the voltage difference between two adjacent cells reaches the second default trimming threshold, if it is carry out step 4, if not then terminating;
Step 4: judge to need to carry out balanced battery according to above step 3, by I/O switching signal control switchgroup pipe Q4, unit switch pipe Q5, unit switch pipe Q6, make switching tube Q1, switching tube Q2, switching tube Q3 carry out open and close; Electric current in inductance can only be filled with next batteries by the diode be connected with switching tube low-voltage end, thus achieves the transfer of energy.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The lithium battery pack equalizing circuit of a kind of composite type of the present invention, realize the non-dissipation transfer of upper batteries energy to next joint adjacent, and final section utilizes the equalizing circuit of resistive dissipation by inductance coil.Read magnitude of voltage by A/D sampling module, judged to need balanced battery, the control I/O switching signal conducting shut-in time by main controller module, utilize inductor winding energy storage principle to control storage and the transfer of energy.The method structure is simple, and transfer scale is controlled, and efficiency is high, is conducive to the consistency improving battery pack.
The lithium battery pack equalizing circuit of a kind of composite type of the present invention and equalization methods, the problem of inconsistency that lithium battery group in use widens gradually can be solved, there is the advantages such as the consistency that structure is simple, transfer scale is controlled, efficiency is high, be conducive to improving battery pack.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the lithium battery pack equalizing circuit of composite type of the present invention.
Fig. 2 is the flow chart of the lithium battery group equalization methods of composite type of the present invention.
Below by way of embodiment, the invention will be further described.
Embodiment
See Fig. 1 ~ Fig. 2, the lithium battery pack equalizing circuit of a kind of composite type of the present invention, its lithium battery group is in series by multiple batteries, comprises battery B1, battery B2 and battery B3; Described lithium battery pack equalizing circuit comprises A/D sampling module, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, diode D2, battery B1, battery B2, battery B3, inductance L 1, inductance L 2, switching tube Q1, switching tube Q2, switching tube Q3, unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6, optocoupler 1, optocoupler 2, optocoupler 3;
Described A/D sampling module meets each batteries B1, battery B2, the battery B3 of serial lithium battery group respectively, and described electric capacity C1, resistance R2 form RC low-pass filter circuit; Similarly, electric capacity C2 and resistance R3, electric capacity C3 and resistance R4, electric capacity C4 and resistance R5 also forms RC low-pass filter circuit respectively, obtains the magnitude of voltage of each block battery for A/D sampling module; The two ends of described resistance R1 connect negative pole and the switching tube Q1 cold end of lithium battery group respectively;
One end of described resistance R2 is connected with one end of electric capacity C1 and tie point is connected with described A/D sampling module, the other end of described resistance R2 is connected with the positive pole of battery B3 in lithium battery group, and one end of the other end of described electric capacity C1, one end of resistance R3, electric capacity C2 is connected and tie point is connected with described A/D sampling module; The other end of resistance R3 is connected with the positive pole of battery B2 in lithium battery group, and one end of the other end of electric capacity C2, one end of resistance R4, electric capacity C3 is connected and tie point is connected with described A/D sampling module; The other end of resistance R4 is connected with the positive pole of battery B1 in lithium battery group, one end of the other end of electric capacity C3, one end of resistance R5, electric capacity C4 is connected and tie point is connected with described A/D sampling module, the other end of resistance R5 is connected with the negative pole of battery B1 in lithium battery group and ground connection, the other end ground connection of electric capacity C4;
In described inductance L 1 first wiring termination serial lithium battery group, battery B1, battery B2 are connected in series point, the cold end of described inductance L 1 second wiring termination switching tube Q2; In described inductance L 2 first wiring termination serial lithium battery group, battery B2, battery B3 are connected in series point, the cold end of described inductance L 2 first wiring termination switching tube Q3;
In the high potential termination serial lithium battery group of described switching tube Q1, battery B1, battery B2 are connected in series point, in the high potential termination serial lithium battery group of described switching tube Q2, battery B2, battery B3 are connected in series point, the positive pole of battery B3 in the high potential termination serial lithium battery group of described switching tube Q3;
The binding site of the control termination unit switch pipe Q6 of described switching tube Q1, the binding site of the control termination unit switch pipe Q5 of described switching tube Q2, the binding site of the control termination unit switch pipe Q4 of described switching tube Q3, the high voltage termination battery B3 positive pole of described unit switch pipe Q4, the low-voltage termination battery B2 of described unit switch pipe Q4, battery B3 is connected in series point, the output of the control termination optocoupler 1 of described unit switch pipe Q4, the high voltage termination battery B2 of described unit switch pipe Q5, battery B3 is connected in series point, the low-voltage termination battery B1 of described unit switch pipe Q5, battery B2 is connected in series point, the output of the control termination optocoupler 2 of described unit switch pipe Q5, the high voltage termination battery B2 of described unit switch pipe Q6, battery B3 is connected in series point, the low-voltage end ground connection of described unit switch pipe Q6, the output of the control termination optocoupler 3 of described unit switch pipe Q6, described optocoupler 1, optocoupler 2, optocoupler 3 connects I/O switching signal respectively,
The negative pole of described diode D1 connects the cold end of switching tube Q2, and the positive pole of described diode D1 connects the negative pole of battery B1 in serial lithium battery group; The negative pole of described diode D2 connects the cold end of switching tube Q3, and the positive pole of described diode D2 connects the serial connection point of battery B2 in serial lithium battery group, battery B3.In the lithium battery pack equalizing circuit of composite type of the present invention, electric energy is carried out equilibrium to next adjacent joint transfer by inductance coil by the battery that in lithium battery group, non-final one saves, and unnecessary electric energy is carried out equilibrium by resistive dissipation by the final section in lithium battery group.Be the lithium battery group that employing 3 batteries is formed in Fig. 1, if lithium battery group is made up of more batteries, its structure and Fig. 1 similar.Only also can be applied to multiple batteries equilibrium so that three batteries are balanced as schematically performance in Fig. 1, this circuit in actual applications, as required, can save above serial battery circuit conditioning for three.
Described switching tube Q1, switching tube Q2, switching tube Q3 adopt P type metal-oxide-semiconductor, the grid of described P type metal-oxide-semiconductor is the control end of described switching tube, the drain electrode of described P type metal-oxide-semiconductor is the cold end of described switching tube, and the source electrode of described P type metal-oxide-semiconductor is the hot end of described switching tube.
Described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 all adopt P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor to combine; The control end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor grid tie point, the hot end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the source electrode of N-type metal-oxide-semiconductor, the cold end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the drain electrode of P type metal-oxide-semiconductor, and the binding site of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the source electrode of P type metal-oxide-semiconductor and the drain junction of N-type metal-oxide-semiconductor.
Described diode D1, D2 are fast recovery diode, and to be applicable to speed-sensitive switch requirement, and circuit loss is few.
The number of turn specification of described inductance L 1, inductance L 2 is identical.In side circuit except the corresponding resistance of final section battery, the corresponding inductance of other each batteries.Each inductance is around on a closed magnet ring, and described inductance L 1, L2 first terminals are one end of inductance coil, and described inductance L 1, L2 second terminals are the other end of inductance coil.
A lithium battery group equalization methods for composite type, it comprises the steps:
Step 1: judge that battery is in the trickle charge stage or is in and leave standstill not discharge condition;
Step 2: if battery is in the trickle charge stage, judging the first the trimming threshold whether voltage of cell reaches default, if it is carry out step 3, if not then terminating; If battery is in leave standstill not discharge condition, judging the 3rd the trimming threshold whether voltage of cell reaches default, if it is carry out step 3, if not then terminating;
Step 3: judge whether the voltage difference between two adjacent cells reaches the second default trimming threshold, if it is carry out step 4, if not then terminating;
Step 4: judge to need to carry out balanced battery according to above step 3, by I/O switching signal control switchgroup pipe Q4, unit switch pipe Q5, unit switch pipe Q6, make switching tube Q1, switching tube Q2, switching tube Q3 carry out open and close; Electric current in inductance can only be filled with next batteries by the diode be connected with switching tube low-voltage end, thus achieves the transfer of energy.
The present invention is a kind of structure based on adjacent cell transfer energy, balanced deterministic process is as follows: in the battery trickle charge stage, this stage battery charge is less, battery voltage value is obtained by A/D sampling module, judge whether each batteries voltage reaches and will carry out the first balanced trimming threshold, judge whether any two batteries voltage differences reach the second trimming threshold simultaneously; If reached, so start the balancing procedure of a upper batteries downward batteries transfer energy, otherwise terminate, do not carry out equalization operation; Do not use at battery and leave standstill in the process of a period of time, carry out equilibrium to judge, now whether voltage is higher than the 3rd trimming threshold, if brownout, equilibrium there is no need to carry out, if single-unit voltage reaches the 3rd trimming threshold, and arbitrary neighborhood two economizes on electricity, pressure reduction also reaches the second trimming threshold, then open balancing procedure.Idiographic flow as shown in Figure 2.Judge through above-mentioned equilibrium, the multiple batteries that can realize meeting equalization request operates simultaneously, ensure that efficiency and safety.
Obtained needing balanced battery cell by balanced deterministic process, come respective combination switch Q4 by I/O switch terminals, Q5, Q6 operates, make switching tube Q1, Q2, Q3 carries out open and close, when needing the corresponding switching tube of balanced monomer to open (non-final one batteries), battery is through switching tube and inductance conducting, now circuit reduction is single order RL circuit, and be in a kind of zero state response, inductive current rises, after certain hour, switching tube is closed, now due to inductance characteristic, meeting compensating circuit current loss, and switching tube has been closed, electric current in inductance can only be filled with next batteries by the diode be connected with switching tube low-voltage end, thus achieve the transfer of energy.
In this process, the transfer scale of energy is controlled by the ON time of control switch pipe, and transfer process does not rely on voltage difference, is controlled the transfer of energy completely by switching tube.
For the equilibrium of final section battery, energy trasfer cannot be carried out to next joint again by inductance, so adopt resistive dissipation energy here.When needs carry out equilibrium to final section time, switching tube Q1 opens, and energy dissipation is fallen by resistance R by battery.Until MCU sends no longer carry out balanced order to final section, then close switching tube Q1.
Equalizing circuit of the present invention and equalization methods may be used for multiple batteries equilibrium, just in order to illustrate in figure, describe by three batteries.
Embodiment recited above is only be described the preferred embodiment of the present invention, not limits the spirit and scope of the present invention.Under the prerequisite not departing from design concept of the present invention; the various modification that this area ordinary person makes technical scheme of the present invention and improvement; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, all records in detail in the claims.
Claims (6)
1. a lithium battery pack equalizing circuit for composite type, is characterized in that, lithium battery group is in series by multiple batteries, comprises battery B1, battery B2 and battery B3; Described lithium battery pack equalizing circuit comprises A/D sampling module, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, diode D2, battery B1, battery B2, battery B3, inductance L 1, inductance L 2, switching tube Q1, switching tube Q2, switching tube Q3, unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6, optocoupler 1, optocoupler 2, optocoupler 3;
Described A/D sampling module meets each batteries B1, battery B2, the battery B3 of serial lithium battery group respectively, and described electric capacity C1, resistance R2 form RC low-pass filter circuit; The two ends of described resistance R1 connect negative pole and the switching tube Q1 cold end of lithium battery group respectively;
One end of described resistance R2 is connected with one end of electric capacity C1 and tie point is connected with described A/D sampling module, the other end of described resistance R2 is connected with the positive pole of battery B3 in lithium battery group, and one end of the other end of described electric capacity C1, one end of resistance R3, electric capacity C2 is connected and tie point is connected with described A/D sampling module; The other end of resistance R3 is connected with the positive pole of battery B2 in lithium battery group, and one end of the other end of electric capacity C2, one end of resistance R4, electric capacity C3 is connected and tie point is connected with described A/D sampling module; The other end of resistance R4 is connected with the positive pole of battery B1 in lithium battery group, one end of the other end of electric capacity C3, one end of resistance R5, electric capacity C4 is connected and tie point is connected with described A/D sampling module, the other end of resistance R5 is connected with the negative pole of battery B1 in lithium battery group and ground connection, the other end ground connection of electric capacity C4;
In described inductance L 1 first wiring termination serial lithium battery group, battery B1, battery B2 are connected in series point, the cold end of described inductance L 1 second wiring termination switching tube Q2; In described inductance L 2 first wiring termination serial lithium battery group, battery B2, battery B3 are connected in series point, the cold end of described inductance L 2 first wiring termination switching tube Q3;
In the high potential termination serial lithium battery group of described switching tube Q1, battery B1, battery B2 are connected in series point, in the high potential termination serial lithium battery group of described switching tube Q2, battery B2, battery B3 are connected in series point, the positive pole of battery B3 in the high potential termination serial lithium battery group of described switching tube Q3;
The binding site of the control termination unit switch pipe Q6 of described switching tube Q1, the binding site of the control termination unit switch pipe Q5 of described switching tube Q2, the binding site of the control termination unit switch pipe Q4 of described switching tube Q3, the high voltage termination battery B3 positive pole of described unit switch pipe Q4, the low-voltage termination battery B2 of described unit switch pipe Q4, battery B3 is connected in series point, the output of the control termination optocoupler 1 of described unit switch pipe Q4, the high voltage termination battery B2 of described unit switch pipe Q5, battery B3 is connected in series point, the low-voltage termination battery B1 of described unit switch pipe Q5, battery B2 is connected in series point, the output of the control termination optocoupler 2 of described unit switch pipe Q5, the high voltage termination battery B2 of described unit switch pipe Q6, battery B3 is connected in series point, the low-voltage end ground connection of described unit switch pipe Q6, the output of the control termination optocoupler 3 of described unit switch pipe Q6, described optocoupler 1, optocoupler 2, optocoupler 3 connects I/O switching signal respectively,
The negative pole of described diode D1 connects the cold end of switching tube Q2, and the positive pole of described diode D1 connects the negative pole of battery B1 in serial lithium battery group; The negative pole of described diode D2 connects the cold end of switching tube Q3, and the positive pole of described diode D2 connects the serial connection point of battery B2 in serial lithium battery group, battery B3.
2. the lithium battery pack equalizing circuit of a kind of composite type according to claim 1, it is characterized in that, described switching tube Q1, switching tube Q2, switching tube Q3 adopt P type metal-oxide-semiconductor, the grid of described P type metal-oxide-semiconductor is the control end of described switching tube, the drain electrode of described P type metal-oxide-semiconductor is the cold end of described switching tube, and the source electrode of described P type metal-oxide-semiconductor is the hot end of described switching tube.
3. the lithium battery pack equalizing circuit of a kind of composite type according to claim 1 and 2, is characterized in that, described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 all adopt P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor to combine; The control end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor grid tie point, the hot end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the source electrode of N-type metal-oxide-semiconductor, the cold end of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the drain electrode of P type metal-oxide-semiconductor, and the binding site of described unit switch pipe Q4, unit switch pipe Q5, unit switch pipe Q6 is the source electrode of P type metal-oxide-semiconductor and the drain junction of N-type metal-oxide-semiconductor.
4. the lithium battery pack equalizing circuit of a kind of composite type according to claim 1, is characterized in that, described diode D1, D2 are fast recovery diode, be applicable to speed-sensitive switch requirement, and circuit loss are few.
5. the lithium battery pack equalizing circuit of a kind of composite type according to claim 1 or 4, is characterized in that, the number of turn specification of described inductance L 1, inductance L 2 is identical.
6. an equalization methods for the lithium battery pack equalizing circuit of composite type according to claim 1, is characterized in that, comprises the steps:
Step 1: judge that battery is in the trickle charge stage or is in and leave standstill not discharge condition;
Step 2: if battery is in the trickle charge stage, judging the first the trimming threshold whether voltage of cell reaches default, if it is carry out step 3, if not then terminating; If battery is in leave standstill not discharge condition, judging the 3rd the trimming threshold whether voltage of cell reaches default, if it is carry out step 3, if not then terminating;
Step 3: judge whether the voltage difference between two adjacent cells reaches the second default trimming threshold, if it is carry out step 4, if not then terminating.
Step 4: judge to need to carry out balanced battery according to above step 3, by I/O switching signal control switchgroup pipe Q4, unit switch pipe Q5, unit switch pipe Q6, make switching tube Q1, switching tube Q2, switching tube Q3 carry out open and close; Electric current in inductance can only be filled with next batteries by the diode be connected with switching tube low-voltage end, thus achieves the transfer of energy.
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| TWI376081B (en) * | 2008-12-08 | 2012-11-01 | Green Solution Tech Co Ltd | The battery charging controller and battery balance charging controller |
| DE102010029460A1 (en) * | 2010-05-28 | 2011-12-01 | Siemens Aktiengesellschaft | Symmetrizing device and balancing method |
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