CN112886078B - Lithium battery pack series connection balance control device and method - Google Patents
Lithium battery pack series connection balance control device and method Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 56
- 238000004891 communication Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4264—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing with capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a lithium battery pack series equalization control device and a lithium battery pack series equalization control method, which comprise a filter capacitor connected at two ends of each battery in parallel and an inductor connected at the midpoint of the batteries of a series battery pack, and further comprise a current sampling resistor, two switching tubes, an information acquisition module, an equalization enabling module and a state machine, wherein the current sampling resistor is connected between the midpoint of the batteries of the series battery pack and the inductor, the information acquisition module is connected with two ends of the current sampling resistor and the series battery pack, grids of the two switching tubes are connected with the equalization enabling module, the other two poles of the two switching tubes are respectively connected with the upper end battery and the lower end battery of the series battery pack in parallel, the information acquisition module and the equalization enabling module are both connected with the state machine, and the information acquisition module is also connected with the equalization enabling module. The invention adopts a control method of the state machine, can effectively avoid discrete inconsistent areas at two ends of the lithium battery voltage platform by reasonably setting the state switching threshold voltage, and avoids system risks caused by balanced misoperation.
Description
Technical Field
The invention relates to the technical field of electrochemical energy and power supplies, in particular to a lithium battery pack series connection equalization control device and method.
Background
The application range of power batteries is very wide, and packaged batteries PACK are often connected in series and parallel to achieve the required system voltage and system capacity. After series-parallel connection, imbalance of the battery packs often causes reduction of system capacity, reduction of system life, and even system risk in severe cases. In order to slow down the degradation of the system capacity to improve the life of the system, a balance control and a device for the battery pack are required. The prior art mainly has the following defects:
1. the existing balancing scheme mostly takes a battery cell as a balanced object. The main reason for inconsistency caused by PACK formed after capacity grading of the battery cell is the self-consumption of the battery cell, the numerical value of the inconsistency is very low, and the inconsistency is sufficiently eliminated by adopting passive equalization and is safer. The BMS management system exists in the PACK, the inconsistency of power consumption caused by the BMS management system is high, the aim of balance is difficult to achieve only by passive balance, and if the passive balance with high power is added, the problems of high heat productivity and serious energy waste exist. The balancing scheme provided by the invention realizes balancing by flowing energy among the unbalanced battery packs, and has stronger balancing capability and higher system efficiency.
2. The existing scheme is either too simple as in granted patent CN200510038762, and the provided balance current is too small (often in milliamp level) to meet the balance requirement of the battery pack level, or too complex as in granted patent CN201110352469, which is connected in parallel with R4 of BT2, and R8 causes the BT2 to continuously discharge, and introduces unbalanced consumption, and the consumption value is far greater than the self-consumption of the battery core, but rather, the system is unbalanced, and too much uncertainty is introduced for the system safety.
3. Most of the existing schemes only provide hardware connection, and cannot combine with detailed control sequence or control logic, the balance of the battery needs to combine with the consideration of the factors of the state of charge, the state of charge and discharge, the temperature and the like of the battery, and the latter is the core of the balance technology. The chemical characteristics of the most important lithium battery determine that discreteness exists at two ends of voltage, the voltage difference cannot accurately reflect the actual capacity in a full range, and the system risk is caused by discharging when the actual discharge condition is not met.
In summary, no balancing scheme that is feasible at the battery pack level is currently available.
Disclosure of Invention
The invention aims to provide a lithium battery pack series connection equalization control device and a lithium battery pack series connection equalization control method, which are used for overcoming the defects in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a lithium battery pack series equalization control device is used in at least one group of series battery packs and comprises filter capacitors respectively connected in parallel at two ends of each battery and an inductor connected at the midpoint of the batteries of the series battery packs, a current sampling resistor R1, two switching tubes, an information acquisition module, an equalization enabling module and a state machine, wherein the current sampling resistor is connected between the midpoint of the batteries of the series battery packs and the inductor, the information acquisition module is connected with two ends of the current sampling resistor and the series battery packs, grid electrodes of the two switching tubes are connected with the equalization enabling module, the other two poles of the two switching tubes are respectively connected in parallel with upper-end batteries and lower-end batteries of the series battery packs, the information acquisition module and the equalization enabling module are both connected with the state machine, the information acquisition module is also connected with the equalization enabling module, the state machine comprises a low power consumption state bit, a battery information monitoring flag bit and an equalization enabling state bit, the low-power consumption state bit is in a low-power consumption mode in a default mode, the battery information monitoring zone bit is in a non-monitoring mode in a default mode, the equalization enabling state bit is in a non-equalization mode in a default mode, the information acquisition module acquires battery information of the series-connected battery packs and changes the zone bit of the state machine according to voltage information of the series-connected battery packs.
Further, the switch tube is a MOSFET tube.
Further, the two switch tubes comprise a first switch tube and a second switch tube, the drain electrode of the first switch tube is connected with the positive electrode of the series battery pack, the source electrode of the first switch tube is connected with the other end of the inductor, the drain electrode of the second switch tube is connected with the negative electrode of the series battery pack, and the source electrode of the second switch tube is connected with the other end of the inductor.
Furthermore, the default state of the low-power-consumption state bit is 1, which represents a low-power-consumption mode, the low-power-consumption mode exits when the default state of the low-power-consumption state bit is 0, and the functions of driving, communication, display and monitoring are closed in the low-power-consumption mode; the default state of the equalization enabling state bit is 0 to represent a non-equalization mode, the equalization mode is entered when the equalization enabling state bit is 1, and the equalization controller is enabled to carry out current vector control according to the voltage relation of the two groups of batteries in the equalization mode; the default of the battery information monitoring zone bit is 0 to represent a non-monitoring mode, the monitoring mode is entered when the battery information monitoring zone bit is 1, and the series battery pack is monitored in the monitoring mode.
The invention also provides a control method of the lithium battery pack series connection equalization control device, which comprises the following steps,
firstly, when the Vpack1+ Vpack2 is judged to be more than Vstart, the device is started;
then, when the Vpack1 is larger than the Vset1 and the Vpack2 is larger than the Vset1, the low power consumption state bit exits from the low power consumption mode, the equalization enabling state bit is kept in the non-equalization mode, and the battery information monitoring flag bit enters into the monitoring mode;
secondly, when the absolute value of Vpack1-Vpack2 is more than V1, the equalization enabling state bit enters an equalization mode, and the battery information monitoring flag bit keeps the monitoring mode;
finally, when the absolute value of Vpack1-Vpack2 is less than V2, the equalization enabling state bit enters an unbalanced mode, and the battery information monitoring flag bit keeps the monitoring mode;
wherein V2 is less than V1, Vpack1 is the upper end cell voltage of the series battery pack, and Vpack2 is the lower end cell voltage Vpack2 of the series battery pack.
Further, the battery voltage is monitored in real time when the battery information monitoring flag bit is in the monitoring mode, and when Vpack1< Vset2, Vpack2 < Vset2, Vpack1< Vset3, and Vpack2 < Vset3 are satisfied, the low power consumption state bit is entered into the low power consumption mode, the equalization enable state bit is entered into the non-equalization mode, and the battery information monitoring flag bit is entered into the non-monitoring mode.
Further, when the equalization enable state bit is in the equalization mode, the drive waveform of the drive output first switching tube Q1 and the second switching tube Q2 is at a 50% duty ratio in the initial state, the duty ratio of the second switching tube Q2 is increased to make the current positive if Vpack1> Vpack2, and the duty ratio of the second switching tube Q2 is decreased to make the current positive if Vpack1< Vpack 2.
Compared with the prior art, the invention has the advantages that: the invention takes the middle point of the series battery pack as a control ground, and effectively solves the problem of unbalanced influence on the battery pack belt in the prior art; meanwhile, the invention carries out strategy control based on the state machine, realizes vector control of the controlled quantity of the inductive current by controlling the duty ratio of the switching tube, and further realizes the control of energy flow based on battery monitoring information. The unbalanced energy is transferred into the low-energy battery pack, and compared with the existing passive balancing technology, the battery pack has stronger balancing capability and higher efficiency; the invention improves the effective capacity of the system by adjusting the problem of energy imbalance among the series-connected battery packs and prolongs the service life of the system. Compared with the existing balancing scheme, the scheme has higher balancing capability, so that the requirement on the initial charge state of each battery pack is lower during system installation, the production cost is greatly reduced, the dependence on high-precision production equipment is reduced, and the requirement on production consistency is reduced. By adopting a control method of the state machine, the discrete inconsistency areas at two ends of the lithium battery voltage platform can be effectively avoided by reasonably setting the state switching threshold voltage, and the system risk caused by balanced misoperation is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a lithium battery pack series connection equalization control apparatus according to the present invention.
Fig. 2 is a flow chart of a lithium battery pack series connection equalization control method according to the present invention.
FIG. 3 is a flowchart of the equalizing control procedure of the present invention.
FIG. 4 is a diagram illustrating the relationship between the equalizing current and the offset voltage in the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Referring to fig. 1, the invention discloses a lithium battery pack series equalization control device, which is used in at least one group of series battery packs, and comprises filter capacitors C1 and C2 which are respectively connected in parallel at two ends of each battery, an inductor L connected at the midpoint of the batteries of the series battery packs, a current sampling resistor R1, two switching tubes, an information acquisition module, an equalization enabling module and a state machine, wherein the current sampling resistor R1 is connected between the midpoint of the batteries of the series battery packs and the inductor L, the information acquisition module is connected with two ends of the current sampling resistor R1 and the series battery packs, gates of the two switching tubes are connected with the equalization enabling module, the other two poles of the two switching tubes are respectively connected in parallel with the upper end batteries and the lower end batteries of the series battery packs, the information acquisition module and the equalization enabling module are both connected with the state machine, the information acquisition module is also connected with the equalization enabling module, the state machine comprises a low-power consumption state bit, a battery information monitoring zone bit and a balance enabling state bit, the low-power consumption state bit is in a low-power consumption mode in a default mode, the battery information monitoring zone bit is in a non-monitoring mode in a default mode, the balance enabling state bit is in a non-balance mode in a default mode, the information acquisition module acquires battery information of the series battery packs and changes the zone bit of the state machine according to voltage information of the series battery packs.
The two switching tubes comprise a first switching tube Q1 and a second switching tube Q2, the drain electrode of the first switching tube Q1 is connected with the positive electrode of the series battery pack, the source electrode of the first switching tube Q1 is connected with the other end of the inductor L, the drain electrode of the second switching tube Q2 is connected with the negative electrode of the series battery pack, and the source electrode of the second switching tube Q2 is connected with the other end of the inductor L.
The switch tube is a MOSFET tube.
The default state of the low-power-consumption state bit is 1 to represent a low-power-consumption mode, the low-power-consumption mode exits when the default state of the low-power-consumption state bit is 0, and the functions of driving, communication, display and monitoring are closed in the low-power-consumption mode; the default state of the equalization enabling state bit is 0 to represent a non-equalization mode, the equalization mode is entered when the equalization enabling state bit is 1, and the equalization controller is enabled to carry out current vector control according to the voltage relation of the two groups of batteries in the equalization mode; the default of the battery information monitoring zone bit is 0 to represent a non-monitoring mode, the monitoring mode is entered when the battery information monitoring zone bit is 1, and the series battery pack is monitored in the monitoring mode.
Referring to fig. 2 to 3, the present invention further provides a control method of the lithium battery pack series connection equalization control apparatus, where the control method includes the following steps:
firstly, when the Vpack1+ Vpack2 is judged to be more than Vstart, the device is started;
then, when the Vpack1 is larger than the Vset1 and the Vpack2 is larger than the Vset1, the low power consumption state bit exits the low power consumption mode (set to 0), the equalization enabling state bit is kept in the non-equalization mode (set to 0), and the battery information monitoring flag bit enters the monitoring mode (set to 1);
secondly, when judging that | Vpack1-Vpack2| > V1 (100 mV in the embodiment), the equalization enable status bit enters the equalization mode (set to 1), and the battery information monitoring flag bit keeps the monitoring mode (set to 1);
finally, when | Vpack1-Vpack2| < V2 (50 mV in the embodiment), the equalization enable status bit enters the non-equalization mode (set to 0), and the battery information monitoring flag bit keeps the monitoring mode (set to 1);
wherein V2 is less than V1, Vpack1 is the upper end cell voltage of the series battery pack, and Vpack2 is the lower end cell voltage Vpack2 of the series battery pack.
When the battery information monitoring flag bit is in the monitoring mode, the battery voltage is monitored in real time, and when Vpack1< Vset2, Vpack2 < Vset2, Vpack1< Vset3 and Vpack2 < Vset3 are satisfied, the low power consumption state bit enters the low power consumption mode (set to 1), at which time the device is turned off, the equalization enable state bit enters the non-equalization mode (set to 0) and the battery information monitoring flag bit enters the non-monitoring mode (set to 0). The protection values of the Vset2 and the Vset3 are set, so that the problem of voltage difference caused by neglecting the discreteness of the lower end of the voltage of a lithium battery platform under the starting condition of the existing balancing technology is successfully solved.
In the embodiment, the Vset1, the Vset2, the Vset3, the V1 and the V2 can be modified according to different initial states of the battery.
When the equalization enable bit is in the equalization mode (i.e., when the equalization enable bit is set to 1), the driving waveform of the first switch tube Q1 and the second switch tube Q2 is initially set to 50% duty ratio, the duty ratio of the second switch tube Q2 is increased to make the current positive if Vpack1> Vpack2, and the duty ratio of the second switch tube Q2 is decreased to make the current positive if Vpack1< Vpack2, as shown in fig. 4, the specific relationship between the current control and the voltage difference is specifically set to a relationship between the current control and the voltage difference, when the equalization enable bit is 0 and the battery monitor bit is 1, the driving is turned off, the battery information is continuously monitored, and when the equalization enable bit is 0 and the battery monitor bit is 0, the device enters the low power consumption mode.
When the passive equalization method is applied specifically, the wiring is very simple, safe and reliable, the problem of unbalance of a battery system in series connection application is successfully solved, and the problems of low efficiency, large heat generation, limited application scene and the like in the conventional passive equalization technology are solved. The method can realize the adjustment of the balance capability by adjusting the power grade of the main power loop, successfully reduces the harsh requirement of the series connection of the battery packs on the consistency of the initial charging conditions of the battery packs to be connected in series, takes the middle point of the battery as a control ground, and solves the problem of unbalanced power consumption caused by the existing active balance technology. When the series battery pack is in an emptying state, the electrical core discreteness is the chemical characteristic of the battery, the pressure difference is large but the battery pack does not have a discharging condition, and the danger of over-discharging of the battery pack caused by the balancing device is successfully avoided through the setting of the enabling threshold voltage based on the control logic of the state machine.
Although the embodiments of the present invention have been described with reference to the drawings, the owner of the patent may make various changes or modifications within the scope of the appended claims, such as exchanging data representing flag bits, etc., within the scope of the present invention as long as the scope of the present invention is not exceeded by the claims.
Claims (6)
1. The utility model provides a lithium cell package series connection balanced control device for in at least a set of series connection battery package, including parallelly connected the filter capacitance at every battery both ends respectively, the inductance of the battery mid point of series connection battery package is connected to one end, its characterized in that: the battery equalization system comprises a battery pack, a current sampling resistor, two switching tubes, an information acquisition module, an equalization enabling module and a state machine, wherein the current sampling resistor is connected between the midpoint of the battery pack in series and an inductor, the information acquisition module is connected with the two ends of the current sampling resistor and the battery pack in series, the grids of the two switching tubes are connected with the equalization enabling module, the other two poles of the two switching tubes are respectively connected with the upper end battery and the lower end battery of the battery pack in series in parallel, the information acquisition module and the equalization enabling module are both connected with the state machine, the information acquisition module is also connected with the equalization enabling module, the state machine comprises a low power consumption state bit, a battery information monitoring zone bit and an equalization enabling state bit, the low power consumption state bit is in a low power consumption mode by default, the battery information monitoring zone bit is in a non-monitoring mode by default, and the equalization enabling state bit is in a non-equalization mode by default, the information acquisition module acquires battery information of the series battery packs and changes the zone bit of the state machine according to the voltage information of the series battery packs;
the two switch tubes comprise a first switch tube and a second switch tube, the drain electrode of the first switch tube is connected with the positive electrode of the series battery pack, the source electrode of the first switch tube is connected with the other end of the inductor, the drain electrode of the second switch tube is connected with the negative electrode of the series battery pack, and the source electrode of the second switch tube is connected with the other end of the inductor.
2. The lithium battery pack series connection equalization control device of claim 1, wherein: the switch tube is an MOSFET tube.
3. The lithium battery pack series connection equalization control device of claim 1, wherein: the default state of the low-power-consumption state bit is 1 to represent a low-power-consumption mode, the low-power-consumption mode exits when the default state of the low-power-consumption state bit is 0, and the functions of driving, communication, display and monitoring are closed in the low-power-consumption mode; the default state of the equalization enabling state bit is 0 to represent a non-equalization mode, the equalization mode is entered when the equalization enabling state bit is 1, and the equalization controller is enabled to carry out current vector control according to the voltage relation of the two groups of batteries in the equalization mode; the default of the battery information monitoring zone bit is 0 to represent a non-monitoring mode, the monitoring mode is entered when the battery information monitoring zone bit is 1, and the series battery pack is monitored in the monitoring mode.
4. A control method of the lithium battery pack series connection equalization control apparatus according to any one of claims 1 to 3, characterized in that: the control method comprises the following steps of,
firstly, when the Vpack1+ Vpack2 is judged to be more than Vstart, the device is started;
then, when the Vpack1 is larger than the Vset1 and the Vpack2 is larger than the Vset1, the low power consumption state bit exits from the low power consumption mode, the equalization enabling state bit is kept in the non-equalization mode, and the battery information monitoring flag bit enters into the monitoring mode;
secondly, when the absolute value of Vpack1-Vpack2 is more than V1, the equalization enabling state bit enters an equalization mode, and the battery information monitoring flag bit keeps the monitoring mode;
finally, when the absolute value of Vpack1-Vpack2 is less than V2, the equalization enabling state bit enters an unbalanced mode, and the battery information monitoring flag bit keeps the monitoring mode;
wherein V2 is less than V1, Vpack1 is the upper end cell voltage of the series battery pack, and Vpack2 is the lower end cell voltage Vpack2 of the series battery pack.
5. The control method as claimed in claim 4, wherein the battery voltage is monitored in real time when the battery information monitoring flag is in the monitor mode, and when Vpack1< Vset2 or Vpack2 < Vset2 or Vpack1< Vset3 and Vpack2 < Vset3 are satisfied, the low power consumption state bit is entered into the low power consumption mode, the equalization enable state bit is entered into the non-equalization mode, and the battery information monitoring flag is entered into the non-monitor mode.
6. The control method of claim 4, wherein when the equalization enable state bit is the equalization mode, the driving waveform of the driving output first switch transistor Q1 and the second switch transistor Q2 is initially at 50% duty cycle, and wherein the duty cycle of the second switch transistor Q2 is increased to make the current positive if Vpack1> Vpack2, and the duty cycle of the second switch transistor Q2 is decreased to make the current positive if Vpack1< Vpack 2.
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| CN108110352A (en) * | 2016-11-25 | 2018-06-01 | 天津池瑞科技有限公司 | A kind of lithium battery balanced management system |
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