CN102082307B - Method and system for parallel use of lithium battery modules - Google Patents
Method and system for parallel use of lithium battery modules Download PDFInfo
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- CN102082307B CN102082307B CN2010106201010A CN201010620101A CN102082307B CN 102082307 B CN102082307 B CN 102082307B CN 2010106201010 A CN2010106201010 A CN 2010106201010A CN 201010620101 A CN201010620101 A CN 201010620101A CN 102082307 B CN102082307 B CN 102082307B
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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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
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Abstract
The embodiment of the invention provides a method and system for parallel use of lithium battery modules. The method comprises the following steps: collecting a voltage value of each lithium battery module at the time of initial power-on; and controlling a voltage D-value between each lithium battery module and a busbar based on a voltage-sharing mode in accordance with the collected information, connecting the lithium battery modules to the busbar in sequence, wherein the lithium battery modules have minimum voltage D-values between the lithium battery modules and the busbar, and simultaneously charging and discharging the lithium battery modules which are connected to the busbar. According to the invention, the lithium battery modules can be connected in parallel after the voltage D-values of the lithium battery modules are kept within a range, thus reducing voltage difference among the lithium battery modules and avoiding large current impact among the lithium battery modules, thereby reducing damages to a battery management system (BMS) circuit and improving the safety of the parallel use of the lithium battery modules.
Description
Technical field
The present invention relates to a kind of lithium electricity module using method in parallel and system.
Background technology
Lithium battery energy density height, monomer electricity core voltage height, long, memory-less effect of life-span, pollution-free, therefore adopting lithium battery power supply is the development trend of battery applications.In high-power applications, at first need monomer electricity core to be composed in series battery pack and improve supply power voltage, then the battery pack power output of power supply that improves in parallel again.Battery pack after monomer electricity core and the series connection all needs battery management system (Battery Management System, BMS) monitoring management.Lithium battery group and BMS form lithium electricity module jointly.
The lithium electricity module subject matter that exists of using in parallel is heavy current impact between group.Because each battery voltage difference is directly in parallel, have the process of a balance of voltage at convergent point.In this process, because the battery pack internal resistance is very little, will produce very big electric current because of pressure reduction between the different battery pack, thereby can cause the BMS circuit to damage.
Summary of the invention
The embodiment of the invention provides a kind of lithium electricity module using method in parallel and system, can reduce the damage to the BMS circuit, improves the fail safe of using in parallel of lithium electricity module.
The embodiment of the invention adopts following technical scheme:
A kind of lithium battery group using method in parallel comprises:
Collect the magnitude of voltage of each lithium electricity module when initially powering on;
According to the information of collecting, control voltage difference between each lithium electricity module and the busbar according to equal pressure modes, and successively and busbar between the lithium electricity module of voltage difference minimum insert busbar;
Described each lithium electricity module behind the access busbar is discharged and recharged simultaneously.
A kind of lithium electricity module use in parallel system comprises: more than one lithium electricity module, main control unit; Wherein, described main control unit, be used for collecting the magnitude of voltage of each lithium electricity module when initially powering on, according to the information of collecting, control voltage difference between each lithium electricity module and the busbar according to equal pressure modes, and successively and busbar between the lithium electricity module of voltage difference minimum insert busbar, then described each lithium electricity module that inserts behind the busbar is discharged and recharged simultaneously.
As shown from the above technical solution, the embodiment of the invention is by controlling the voltage difference between each lithium electricity module and the busbar according to equal pressure modes, and successively and busbar between the lithium electricity module of voltage difference minimum insert busbar, can make the voltage difference of each lithium electricity module keep inserting again within the specific limits in parallel, to reduce the voltage difference between the battery pack, avoid heavy current impact between battery pack, thereby can reduce the BMS circuit is damaged, improve the fail safe of using in parallel of lithium electricity module.
Description of drawings
The accompanying drawing of required use is done an introduction simply in below the present invention being described.
The control lithium electricity module method schematic diagram that uses in parallel that Fig. 1 provides for the embodiment of the invention;
The structured flowchart of the control lithium electricity module system that uses in parallel that Fig. 2 provides for the embodiment of the invention;
Fig. 3 all presses the schematic diagram of parallel way for the charging of the embodiment of the invention one;
Fig. 4 all presses the schematic diagram of parallel way for the discharge of the embodiment of the invention two;
Fig. 5 is the schematic diagram that cooperates parallel way that discharges and recharges of the embodiment of the invention three;
Fig. 6 is the schematic diagram of charging current limiter parallel way.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is clearly and completely described.
Referring to Fig. 1, the lithium electricity module using method in parallel that the embodiment of the invention provides comprises:
S11 collects the magnitude of voltage of each lithium electricity module when initially powering on.
S12 according to the information of collecting, controls voltage difference between each lithium electricity module and the busbar according to equal pressure modes, and successively and busbar between the lithium electricity module of voltage difference minimum insert busbar.
S13 discharges and recharges simultaneously to described each lithium electricity module behind the access busbar.
Referring to Fig. 2, the lithium electricity module use in parallel system that the embodiment of the invention provides comprises: more than one lithium electricity module, main control unit; Wherein, main control unit is used for collecting the magnitude of voltage of each lithium electricity module when initially powering on, according to the information of collecting, control voltage difference between each lithium electricity module and the busbar according to equal pressure modes, and successively and busbar between the lithium electricity module of voltage difference minimum insert busbar, then described each lithium electricity module after inserting is discharged and recharged simultaneously.
Particularly, lithium electricity module use in parallel system mainly is made up of lithium electricity module, main control unit, system power supply, load, and wherein lithium electricity module is made up of battery pack and BMS (battery management system).The function of each part is as follows:
Lithium electricity module (101,102,103) is a kind of back-up power apparatus in the DC power system, is used for externally discharging when system blackout, keeps system's operate as normal.Lithium electricity module is made up of lithium battery group and BMS.
Battery management system BMS (201,202,203) is a kind of device of managing the lithium battery group, for detection of voltage, the electric current of lithium battery group and monomer electricity core, judges abnormal conditions and makes the protection action.BMS can/dry contact/intermodule communication wireless by serial ports/network interface/CAN/ etc. communication interface and main control unit 401 carry out information interaction.In embodiment of the invention system, BMS can receive the control of main control unit, carries out the action that is articulated to system power supply.
Lithium battery group (301,302,303) is a kind of device of storage of electrical energy, is in series by single-unit electricity core.According to the difference of application scenarios, jumbo electric core is directly connected, and the electric core parallel connection earlier of low capacity is connected then.
Main control unit 401 is to carry out the device that data operation and signal controlling are handled, and finishes the collection of each BMS voltage, all presses the computing of algorithm, the access of alarm data and the output function of alarm signal.Main control unit can be independently parts, also can be used as software and is present among the BMS.
System power supply 501 is supply units of a kind of direct current output, and the communications field is generally the 48V direct current.In the inventive embodiments system, system power supply is as the equipment to the charging of lithium battery group, and the while is powering load also.Whether externally system power supply can control discharge.
Load 601 is general designations of power consumption equipment, consumed power.Load mentioned in this article all is dc suppling equipment.
Busbar 701 is convergent points of system power supply, lithium electricity module, load.
Be understandable that Fig. 2 has only enumerated the situation of three groups of lithium electricity modules parallel connection, the method and system of the embodiment of the invention can be supported the parallel connection of unlimited many group lithium electricity modules in theory.
The system works principle of the embodiment of the invention is as follows: when initially powering on, the BMS disconnection lithium electricity module of each lithium electricity module of main control unit 401 controls and being connected of busbar, and the magnitude of voltage of the lithium managed electricity module reported main control unit by communication interface, main control unit is according to reported result, collect the magnitude of voltage of each lithium electricity module when initially powering on, control voltage difference between each lithium electricity module and the busbar according to equal pressure modes, and successively and busbar between the lithium electricity module of voltage difference minimum insert busbar, then described each lithium electricity module that inserts behind the busbar is discharged and recharged simultaneously.
By the above-mentioned technology of the embodiment of the invention as can be known, by control the voltage difference between each lithium electricity module and the busbar according to equal pressure modes, make the voltage difference of each lithium electricity module keep inserting again within the specific limits in parallel, to reduce the voltage difference between the battery pack, avoid heavy current impact between battery pack, thereby can reduce the BMS circuit is damaged, improve the fail safe of using in parallel of lithium electricity module.
Adopt embodiment below, the mode that main control unit is controlled the voltage difference between each lithium electricity module and the busbar according to equal pressure modes describes.
Embodiment one: parallel way is all pressed in charging
Referring to Fig. 3, Fig. 3 is the schematic diagram that parallel way is all pressed in the charging of present embodiment, comprising:
S31 sorts from low to high to the magnitude of voltage of each lithium electricity module of not inserting busbar;
S32, according to ranking results, the lithium electricity module that magnitude of voltage is minimum inserts busbar and charges;
S33 when the magnitude of voltage of busbar rises to the magnitude of voltage of next to the lowest lithium electricity module, inserts busbar with described next to the lowest lithium electricity module and charges;
S34 by that analogy, inserts busbar until all lithium electricity modules.
Be that example describes with system construction drawing shown in Figure 2, when initially powering on, system power supply work, the BMS of all lithiums electricity modules disconnects being connected of lithium electricity module and busbar, is in and does not fill the static condition of not putting, and this moment, the initial voltage value of busbar was zero.The magnitude of voltage that each BMS detects its lithium electricity module of managing reports main control unit, by relatively magnitude of voltage and the ordering of each lithium electricity module of main control unit, the BMS of the lithium electricity module that earlier notice voltage is minimum (for example 101) is linked on the busbar, by system power supply lithium battery group 301 is charged, when rising to the magnitude of voltage of next to the lowest lithium electricity module (for example 102) Deng busbar voltage, the BMS that reinforms second group of lithium electricity module is linked on the busbar, by system power supply lithium battery group 302 is charged, by that analogy, all be linked on the busbar up to all lithium electricity modules.
Embodiment two: parallel way is all pressed in discharge
Referring to Fig. 4, Fig. 4 is the schematic diagram that parallel way is all pressed in the discharge of present embodiment, comprising:
S41 sorts from high to low to the magnitude of voltage of each lithium electricity module of not inserting busbar;
S42, according to ranking results, the lithium electricity module that magnitude of voltage is the highest inserts busbar and discharges;
S43 when the magnitude of voltage of busbar drops to the magnitude of voltage of the second high lithium electricity module, inserts busbar with the described second high lithium electricity module and discharges;
S44 by that analogy, inserts busbar until all lithium electricity modules.
Discharge all presses parallel way all to press the hardware configuration of parallel way the same with charging, some little difference above just software programming realizes.Be that example describes with system construction drawing shown in Figure 2 still, when initially powering on, system power supply work, the BMS of all lithiums electricity modules disconnects being connected of lithium electricity module and busbar, is in and does not fill the static condition of not putting, and this moment, the initial voltage value of busbar was zero.The magnitude of voltage that each BMS detects its lithium electricity module of managing reports main control unit, by relatively magnitude of voltage and the ordering of each lithium electricity module of main control unit, the BMS of the lithium electricity module that earlier notice voltage is the highest (for example 101) is linked on the busbar, parting system power supply then, lithium battery group 301 is discharged, when dropping to the magnitude of voltage of second high lithium electricity module (for example 102) Deng busbar voltage, the BMS that reinforms second group of lithium electricity module is linked on the busbar, the parting system power supply discharges to lithium battery group 302, by that analogy, all be linked on the busbar up to all lithium electricity modules.And then the open system power supply discharges and recharges the electric module of each lithium of parallel connection.
Embodiment three: discharge and recharge and all press parallel way
Referring to Fig. 5, Fig. 5 is the schematic diagram of all pressing parallel way that discharges and recharges of present embodiment, comprising:
S51 calculates the average voltage level of the magnitude of voltage of each lithium electricity module that does not insert busbar;
S52, the lithium electricity module that magnitude of voltage is lower than described average voltage level inserts busbar from low to high successively and charges, and rises to described average voltage level until the magnitude of voltage of busbar;
S53, the lithium electricity module that magnitude of voltage is higher than described average voltage level inserts busbar from high to low successively and discharges, and drops to described average voltage level until the magnitude of voltage of busbar.
Particularly, magnitude of voltage is lower than the lithium electricity module of described average voltage level, beginning to insert busbar from the minimum lithium electricity module of magnitude of voltage charges, when the magnitude of voltage of busbar rises to the magnitude of voltage of next to the lowest lithium electricity module, described next to the lowest lithium electricity module is inserted busbar charges, by that analogy, the magnitude of voltage until busbar rises to described average voltage level; The lithium electricity module that magnitude of voltage is higher than described average voltage level, beginning to insert busbar from the highest lithium electricity module of magnitude of voltage discharges, when the magnitude of voltage of busbar drops to the magnitude of voltage of the second high lithium electricity module, the described second high lithium electricity module is inserted busbar discharges, by that analogy, the magnitude of voltage until busbar drops to described average voltage level.
Wherein, above-mentioned steps S52 and step S53 do not have the certain order requirement, can carry out simultaneously, can arbitrary step carry out earlier yet.
Be that example describes with system construction drawing shown in Figure 2 still, when initially powering on, system power supply work, the BMS of all lithiums electricity modules disconnects being connected of lithium electricity module and busbar, is in and does not fill the static condition of not putting, and this moment, the initial voltage value of busbar was zero.The magnitude of voltage that each BMS detects its lithium electricity module of managing reports main control unit, by relatively magnitude of voltage and the ordering of each lithium electricity module of main control unit, calculate average voltage level, if comparative result is: lithium battery group 301 magnitudes of voltage＜lithium battery group 302 magnitudes of voltage＜average voltage level＜lithium battery group 303 magnitudes of voltage, then can be earlier that voltage is minimum lithium electricity module 101 is linked on the busbar, charged by 501 pairs of lithium battery groups 301 of system power supply, when rising to lithium battery group 302 magnitudes of voltage Deng busbar voltage, reinforming lithium electricity module 102 is linked on the busbar, by system power supply lithium battery group 302 is charged, rise to described average voltage level up to the magnitude of voltage of busbar.And then the highest lithium electricity module 103 of notice voltage is linked on the busbar, parting system power supply then, lithium battery group 303 is discharged, and when waiting busbar voltage to drop to described average voltage level, the open system power supply discharges and recharges each lithium electricity module of parallel connection again.
Need to prove, above-described embodiment one to embodiment three, when actual logic is controlled, (decide according to test case by this difference range less than certain limit for voltage difference between lithium battery group and busbar, be traditionally arranged to be ± 0.5V), then notify BMS to articulate this lithium electricity module, judge then whether lithium electricity module all articulates to finish.Do not finish if all articulate, then continue to wait for battery charge or discharge, all be articulated on the busbar up to all lithium electricity modules.By main control unit control system power supply each lithium electricity module that inserts behind the busbar is discharged and recharged simultaneously then.
The main control unit of the invention described above embodiment can be independently parts, also can be used as software function module and is present among the battery management system BMS of each lithium electricity module.
Further, each lithium electricity module of the above embodiment of the present invention wherein is provided with the charging current limiter circuit among the BMS of at least one lithium electricity module.As shown in Figure 6, to being provided with the BMS of charging current limiter circuit, the charge-discharge circuit of each BMS is independent fully.Because the restriction of lithium cell charging curve has current-limiting function in the charging circuit, before the parallel connection of lithium electricity module, BMS is set to charged state, because the function of current limliting, thereby can further avoid heavy current impact.Need to prove that the anodal confluence among Fig. 6 is signal just, may be that negative pole confluxes in the real system, perhaps both positive and negative polarity all confluxes.
The control lithium electricity module method and system of using in parallel that the embodiment of the invention provides can be applied to the scene that all need the parallel connection of lithium electricity module.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (11)
1. a lithium electricity module using method in parallel is characterized in that, comprising:
Collect the magnitude of voltage of each lithium electricity module when initially powering on;
According to the information of collecting, control voltage difference between described each lithium electricity module and the busbar according to equal pressure modes, when actual logic is controlled, if exist voltage difference between lithium electricity module and the described busbar less than certain limit, then notify battery management system BMS to insert described lithium electricity module, judge described each lithium electricity module whether all access finish;
If all inserting, described each lithium electricity module do not finish, then continue to wait for battery charge or discharge, and successively and described busbar between the lithium electricity module of voltage difference minimum insert busbar, all insert described busbar up to described each lithium electricity module, wherein, described busbar is the convergent point of system power supply, described lithium electricity module and load;
Described each lithium electricity module that inserts behind the described busbar is discharged and recharged simultaneously.
2. method according to claim 1 is characterized in that, the magnitude of voltage of each lithium electricity module comprised when described collection initially powered on:
When initially powering on, the battery management system of each lithium electricity module disconnects being connected of lithium electricity module and busbar, and the magnitude of voltage of the electric module of lithium of managing is reported by communication interface;
According to the reported result of the battery management system of described each lithium electricity module, collect the magnitude of voltage of each lithium electricity module when initially powering on.
3. method according to claim 2 is characterized in that, described communication interface be following any: serial ports, network interface, CAN, wireless, dry contact or intermodule communication interface.
4. method according to claim 1, it is characterized in that, described according to the information of collecting, control voltage difference between described each lithium electricity module and the busbar according to equal pressure modes, if exist voltage difference between lithium electricity module and the described busbar less than certain limit, then notify battery management system BMS to insert described lithium electricity module, judge described each lithium electricity module whether all access finish; If described each lithium electricity module all inserts do not finish, then continue to wait for battery charge or discharge, and successively and described busbar between the lithium electricity module of voltage difference minimum insert busbar and comprise:
Magnitude of voltage to each lithium electricity module of not inserting busbar sorts from low to high;
According to ranking results, the lithium electricity module that magnitude of voltage is minimum inserts busbar and charges;
When the magnitude of voltage of busbar rises to the magnitude of voltage of next to the lowest lithium electricity module, described next to the lowest lithium electricity module is inserted busbar charge;
By that analogy, all insert busbar until all lithium electricity modules.
5. method according to claim 1, it is characterized in that, described according to the information of collecting, control voltage difference between described each lithium electricity module and the busbar according to equal pressure modes, if exist voltage difference between lithium electricity module and the described busbar less than certain limit, then notify battery management system BMS to insert described lithium electricity module, judge described each lithium electricity module whether all access finish; If described each lithium electricity module all inserts do not finish, then continue to wait for battery charge or discharge, and successively and described busbar between the lithium electricity module of voltage difference minimum insert busbar and comprise:
Magnitude of voltage to each lithium electricity module of not inserting busbar sorts from high to low;
According to ranking results, the lithium electricity module that magnitude of voltage is the highest inserts busbar and discharges;
When the magnitude of voltage of busbar drops to the magnitude of voltage of the second high lithium electricity module, the described second high lithium electricity module is inserted busbar discharge;
By that analogy, all insert busbar until all lithium electricity modules.
6. method according to claim 1, it is characterized in that, described according to the information of collecting, control voltage difference between described each lithium electricity module and the busbar according to equal pressure modes, if exist voltage difference between lithium electricity module and the described busbar less than certain limit, then notify battery management system BMS to insert described lithium electricity module, judge described each lithium electricity module whether all access finish; If described each lithium electricity module all inserts do not finish, then continue to wait for battery charge or discharge, and successively and described busbar between the lithium electricity module of voltage difference minimum insert busbar and comprise:
Calculate the average voltage level of the magnitude of voltage of each the lithium electricity module that does not insert busbar;
The lithium electricity module that magnitude of voltage is lower than described average voltage level inserts busbar from low to high successively and charges, and rises to described average voltage level until the magnitude of voltage of busbar;
The lithium electricity module that magnitude of voltage is higher than described average voltage level inserts busbar from high to low successively and discharges, and drops to described average voltage level until the magnitude of voltage of busbar.
7. method according to claim 6 is characterized in that,
The described lithium electricity module that magnitude of voltage is lower than described average voltage level inserts busbar from low to high successively and charges, and rises to described average voltage level until the magnitude of voltage of busbar and comprises:
The lithium electricity module that magnitude of voltage is minimum inserts busbar and charges, when the magnitude of voltage of busbar rises to the magnitude of voltage of next to the lowest lithium electricity module, described next to the lowest lithium electricity module is inserted busbar charge, by that analogy, rise to described average voltage level until the magnitude of voltage of busbar;
The described lithium electricity module that magnitude of voltage is higher than described average voltage level inserts busbar from high to low successively and discharges, and drops to described average voltage level until the magnitude of voltage of busbar and comprises:
The lithium electricity module that magnitude of voltage is the highest inserts busbar and discharges, when the magnitude of voltage of busbar drops to the magnitude of voltage of the second high lithium electricity module, described second high lithium electricity module is inserted busbar discharge, by that analogy, drop to described average voltage level until the magnitude of voltage of busbar.
8. according to each described method of claim 1-7, it is characterized in that, in the battery management system of at least one described lithium electricity module, the charging current limiter circuit is set.
9. a lithium electricity module system that uses in parallel is characterized in that, comprising: more than one lithium electricity module, main control unit; Wherein,
Described main control unit, be used for collecting the magnitude of voltage of each lithium electricity module when initially powering on, according to the information of collecting, control voltage difference between described each lithium electricity module and the busbar according to equal pressure modes, when actual logic is controlled, if exist voltage difference between lithium electricity module and the described busbar less than certain limit, then notify battery management system BMS to insert described lithium electricity module, judge the electric module of described each lithium whether all access finish; If all inserting, described each lithium electricity module do not finish, then continue to wait for battery charge or discharge, and successively and described busbar between the lithium electricity module of voltage difference minimum insert busbar, all insert described busbar up to described each lithium electricity module, wherein, described busbar is the convergent point of system power supply, described lithium electricity module and load; Then described each lithium electricity module that inserts behind the described busbar is discharged and recharged simultaneously.
10. system according to claim 9 is characterized in that, the mode that described main control unit is controlled the voltage difference between each lithium electricity module and the busbar according to equal pressure modes comprise following any:
Charging is all pressed, is discharged and all presses or discharge and recharge the mode of all pressing.
11., it is characterized in that described main control unit is independently parts according to claim 9 or 10 described systems, perhaps described main control unit is present in the battery management system of each lithium electricity module as software function module.
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| CN2010106201010A CN102082307B (en) | 2010-12-31 | 2010-12-31 | Method and system for parallel use of lithium battery modules |
| PCT/CN2011/074912 WO2011157116A1 (en) | 2010-12-31 | 2011-05-30 | Lithium battery module parallel using method and system |
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| CN2010106201010A CN102082307B (en) | 2010-12-31 | 2010-12-31 | Method and system for parallel use of lithium battery modules |
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| WO2011157116A1 (en) | 2011-12-22 |
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