CN101599560A - The charging device of lithium secondary battery and charging method - Google Patents
The charging device of lithium secondary battery and charging method Download PDFInfo
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- CN101599560A CN101599560A CNA2009100167244A CN200910016724A CN101599560A CN 101599560 A CN101599560 A CN 101599560A CN A2009100167244 A CNA2009100167244 A CN A2009100167244A CN 200910016724 A CN200910016724 A CN 200910016724A CN 101599560 A CN101599560 A CN 101599560A
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- secondary battery
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 145
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000005611 electricity Effects 0.000 claims abstract description 25
- 239000000178 monomer Substances 0.000 claims description 40
- 150000002641 lithium Chemical class 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 9
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 7
- 229910017052 cobalt Inorganic materials 0.000 description 6
- 239000010941 cobalt Substances 0.000 description 6
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 6
- 229940116007 ferrous phosphate Drugs 0.000 description 6
- 229910000155 iron(II) phosphate Inorganic materials 0.000 description 6
- SDEKDNPYZOERBP-UHFFFAOYSA-H iron(ii) phosphate Chemical compound [Fe+2].[Fe+2].[Fe+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O SDEKDNPYZOERBP-UHFFFAOYSA-H 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of charging device and charging method of lithium secondary battery, relate in particular to a kind of for having the charging device and the charging method of the lithium secondary battery charging that is used to prevent the battery management system that overcharges.The charging modes that the charging method of lithium secondary battery provided by the present invention adopts serial connection charge to combine with the charged in parallel of constant voltage and current limiting.A kind of charging device that charges for lithium secondary battery provided by the present invention comprises: at least one serial connection charge power supply and at least one charged in parallel power supply.The present invention can solve effectively that serial connection charge is prone to overcharges, is not fully filled problem such as electricity, and can avoid the charge power supply cost height of charged in parallel, problem such as reliability is low, charge efficiency is low, the connecting line footpath is thick.
Description
Technical field
The present invention relates to lithium secondary battery and use the field, relating in particular to a kind of is charging device and the charging method with lithium secondary battery charging of battery management system.
Background technology
Lithium ion battery because operating voltage height, volume are little, light weight, memory-less effect, pollution-free, self discharge is little, have extended cycle life, and is a kind of ideal source.In actual use, in order to obtain higher discharge voltage, generally at least two monomer lithium secondary batteries are composed in series the lithium secondary battery use.At present, lithium secondary battery has been widely used in multiple fields such as notebook computer, electric bicycle, electric automobile, stand-by power supply.
The charging method of lithium secondary battery has two kinds: serial connection charge and charged in parallel.
Serial connection charge is generally adopted in the charging of lithium secondary battery at present, and this mainly is because the serial connection charge method is simple in structure, cost is low, be easier to realization.But since between the monomer lithium secondary battery in the difference of aspect of performances such as capacity, internal resistance, attenuation characteristic, self discharge, to the lithium secondary battery serial connection charge time, to be full of at first from that monomer lithium secondary battery that is full of the capacitance minimum in the battery pack, and this moment, other batteries also are not full of, if the continuation serial connection charge, the monomer lithium secondary battery that then has been full of electricity just may be overcharged.
And lithium secondary battery overcharge may cause the blast and the personnel that cause injure; therefore; overcharge in order to prevent the monomer lithium secondary battery; lithium secondary battery generally is equipped with battery management system when using, by battery management system to protections such as each monomer lithium secondary battery overcharge.During serial connection charge, if there is the voltage of a monomer lithium secondary battery to reach over-charge protective voltage, battery management system can stop charging, to prevent that this cell from being overcharged with whole serial connection charge circuitry cuts.And can cause other lithium secondary batteries to be full of like this.Though some battery management system has equalization function, but owing to consider from cost and heat radiation etc. are many-sided, the euqalizing current of battery management system is generally much smaller than the electric current of serial connection charge, therefore portfolio effect is not clearly, the situation that some cells are not fully filled electricity also can appear, this is for the lithium secondary battery that needs the rapid large-current charging, and for example the lithium secondary battery of used for electric vehicle is then more obvious.
For example; with 10 discharge capacities all is that the LiMn2O4 secondary cell of 10Ah is together in series that to form rated voltage be the lithium secondary battery of 37V; if but 9 charged 8Ah of monomer lithium secondary battery wherein in groups; other 1 charged 10Ah of monomer lithium secondary battery; when this battery pack is carried out serial connection charge; wherein that of charged 10Ah monomer lithium secondary battery can be full of earlier; thereby reach over-charge protective voltage; in order to prevent that this monomer lithium secondary battery from being overcharged; battery management system can be with whole serial connection charge circuitry cuts; also just make other 9 batteries can't be full of electricity, and the whole battery group discharge capacity also just have only 8Ah.
Therefore, during to the lithium secondary battery serial connection charge, occur cell easily and overcharge, be not fully filled situations such as electricity, thereby cause the deterioration of whole battery group performance.
The charged in parallel method of lithium secondary battery, though can solve the problem that cell overcharged and be not fully filled electricity, but the charged in parallel method need adopt the charge power supply of low-voltage, big electric current to be each cell charging, therefore defective such as have charge power supply cost height, reliability is low, charge efficiency is low, connecting line footpath is thick does not use this charging method at present on a large scale.
Summary of the invention
Technical problem to be solved by this invention provides a kind of charging device and charging method of lithium secondary battery, what can solve effectively that the lithium secondary battery serial connection charge is prone to overcharges, is not fully filled problem such as electricity, and can avoid the charge power supply cost height of charged in parallel, problem such as reliability is low, charge efficiency is low, the connecting line footpath is thick.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of charging method of lithium secondary battery, this lithium secondary battery has and is used to prevent the battery management system that overcharges, the charging modes that described charging method adopts serial connection charge to combine with the charged in parallel of constant voltage and current limiting.
The invention has the beneficial effects as follows: problems such as overcharging, be not fully filled in the time of can effectively solving the lithium secondary battery serial connection charge, and cost is low, reliability is high, charge efficiency is high.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the electric current of described serial connection charge is not less than 5 times of charged in parallel electric current.
The beneficial effect that adopts above-mentioned further scheme is to realize connecting effective combination of large current charge and low current charge in parallel.
Further, described charging method adopts the charging modes that serial connection charge and charged in parallel carry out simultaneously.
The beneficial effect that adopts above-mentioned further scheme is that convenient series connection large current charge carries out simultaneously with low current charge in parallel, can guarantee that every monomer lithium secondary battery all is full of electricity and does not have to overcharge phenomenon.
Further, at the two ends of lithium secondary battery series connection serial connection charge power supply, be batteries charging; Monomer lithium secondary battery two ends in lithium secondary battery after serial connection charge finishes connect the charged in parallel power supply, for the monomer lithium secondary battery charges.
The beneficial effect that adopts above-mentioned further scheme is that convenient series connection large current charge separates with low current charge in parallel and carries out, and can guarantee that every monomer lithium secondary battery all is full of electricity and does not have to overcharge phenomenon.
Further, monomer lithium secondary battery number more for a long time in the lithium secondary battery, lithium secondary battery is divided into the lithium secondary battery pack module that several comprise a minority lithium secondary battery, adopts serial connection charge to charge with the mode that the charged in parallel of constant voltage and current limiting combines to each lithium secondary battery pack module.
The beneficial effect that adopts above-mentioned further scheme is convenient according to actual conditions, problems such as the number of arrangement serial connection charge power supply and charged in parallel power supply and connected mode.
Magnitude of voltage when further, the monomer lithium secondary battery is full of electricity in the constant voltage value of described charged in parallel power supply and the lithium secondary battery is identical.
The beneficial effect that adopts above-mentioned further scheme is can guarantee effectively that every monomer lithium secondary battery is full of electricity and does not have to overcharge phenomenon.
The technical scheme that the present invention solves the problems of the technologies described above also comprises as follows: a kind of charging device that charges for lithium secondary battery, this lithium secondary battery has and is used to prevent the battery management system that overcharges from also comprising: at least one serial connection charge power supply and at least one charged in parallel power supply; Described serial connection charge power supply is connected with the lithium secondary battery pack module in described lithium secondary battery or the lithium secondary battery; Described charged in parallel power supply is connected with monomer lithium secondary battery in described lithium secondary battery or the lithium secondary battery pack module.
The invention has the beneficial effects as follows: problems such as overcharging, be not fully filled in the time of can effectively solving the lithium secondary battery charging, and cost is low, reliability is high, charge efficiency is high.
Further, same described charged in parallel power supply is connected with every monomer lithium secondary battery in the described lithium secondary battery in turn charges.
The beneficial effect that adopts above-mentioned further scheme is the number that can reduce the charged in parallel power supply according to actual conditions, effectively controls the charge power supply cost.
Further, described charged in parallel power supply is solar recharging power supply or wireless charging power supply.
The beneficial effect that adopts above-mentioned further scheme be operate more simple.
Description of drawings
Fig. 1 is the charging device of lithium secondary battery of the present invention and the principle schematic of charging method;
Fig. 2 is the charging device of lithium secondary battery of the present invention and the block diagram of charging method first embodiment;
Fig. 3 is the charging device of lithium secondary battery of the present invention and the block diagram of charging method second embodiment;
Fig. 4 is the charging device of lithium secondary battery of the present invention and the block diagram of charging method the 3rd embodiment;
Fig. 5 is the charging device of lithium secondary battery of the present invention and the block diagram of charging method the 4th embodiment.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Lithium secondary battery generally is composed in series by the monomer lithium secondary battery more than two, and the capacity of each monomer lithium secondary battery, internal resistance, attenuation characteristic, self discharge etc. all can there are differences.General lithium secondary battery all has and is used to prevent the battery management system that overcharges.
As shown in Figure 1, the charging device of lithium secondary battery provided by the present invention and the principle of charging method are: for having the charging modes that the lithium secondary battery that is used to prevent the battery management system that overcharges can adopt the charged in parallel of serial connection charge and constant voltage and current limiting to combine, that is: in lithium secondary battery two ends serial connection one series connection charge power supply, serial connection charge adopts large current charge, as the main mode of lithium secondary battery charging; Can all connect a charge power supply in parallel in every monomer lithium secondary battery two ends in lithium secondary battery, perhaps the both positive and negative polarity of the lithium secondary battery pack module that can form at a plurality of capacity monomer lithium secondary battery identical with characteristic is connected in series a charge power supply in parallel and charges, magnitude of voltage when the constant voltage value of charged in parallel power supply is full of electricity with the monomer lithium secondary battery during charged in parallel is identical, adopt low current charge, as the supplementary mode of lithium secondary battery charging.Wherein, the electric current of general serial connection charge is not less than 5 times of charged in parallel electric current.Serial connection charge and charged in parallel can carry out simultaneously, also can carry out respectively.Can at first adopt the big electric current of series connection is the lithium secondary battery charging, and when having at least one monomer lithium secondary battery to be full of in the lithium secondary battery, battery management system control serial connection charge power supply disconnects; At this moment, start charged in parallel, the identical charged in parallel power supply of voltage when adopting voltage to be full of with the monomer lithium secondary battery of its serial connection, mode by the little electric current of parallel connection is every monomer lithium secondary battery charging, when the monomer lithium secondary battery is full of, the monomer lithium secondary battery is identical with the charged in parallel power source voltage, and charging process finishes immediately.Like this, can guarantee that every monomer lithium secondary battery all is full of electricity in the lithium secondary battery, and the phenomenon that can not occur overcharging.Monomer lithium secondary battery number more for a long time in lithium secondary battery, lithium secondary battery can be divided into the lithium secondary battery pack module that several comprise a minority lithium secondary battery, the mode that adopts above-mentioned serial connection charge to combine with charged in parallel to each lithium secondary battery pack module is charged respectively.
As shown in Figure 1, the charging device of lithium secondary battery provided by the present invention comprises: at least one serial connection charge power supply and at least one charged in parallel power supply; The serial connection charge power supply is connected on the lithium secondary battery pack module two ends in lithium secondary battery two ends or the lithium secondary battery, and every monomer lithium secondary battery two ends in the lithium secondary battery pack module in lithium secondary battery or lithium secondary battery connect an independently charged in parallel power supply.Also can in lithium secondary battery or lithium secondary battery pack module, same charged in parallel power supply be connected in parallel on every monomer lithium secondary battery two ends in turn charge.Wherein, the charged in parallel power supply can be solar recharging power supply or wireless charging power supply.
Because lithium secondary battery has plurality of specifications, therefore with 25.2V, the 8Ah cobalt acid lithium secondary battery of electric bicycle with 7 strings, 48.1V, the 15Ah LiMn2O4 secondary battery of automobile-used 13 strings of electric motorcycle, 345.6V, 40Ah ferrous phosphate lithium secondary battery and the pure electric automobile of Hybrid Vehicle 108 strings is example with 288V, the 100Ah ferrous phosphate lithium secondary battery of 90 strings, and the present invention is described in further detail below:
Embodiment one
As shown in Figure 2, when charging with the sour lithium secondary battery of 25.2V, 8Ah cobalt of 7 strings for electric bicycle, the total of cobalt acid lithium secondary battery is being the serial connection charge power supply of 29.4V with a restriction of total negative two ends series connection output voltage just, and carrying out serial connection charge with the restriction charging current of 2A, a restriction output voltage in parallel is that 4.2V, restriction output current are that the charged in parallel power supply of 200mA carries out charged in parallel for each cell at the two ends of every battery simultaneously.In the charging process, serial connection charge and charged in parallel carry out simultaneously, are its voltage when reaching over-charge protective voltage if arbitrary cell is full of electricity, and then the battery management system in the cobalt acid lithium secondary battery will cut off the serial connection charge power supply, the serial connection charge end.And at this moment for the battery of underfill electricity, owing to still have voltage difference between battery and the charged in parallel power supply, its charged in parallel process will be proceeded, and when every cell is full of electricity, not have voltage difference between battery and the charged in parallel power supply, and charged in parallel finishes.So far, the charging process of cobalt acid lithium secondary battery finishes.Adopt above-mentioned charging modes, every battery all can guarantee to be full of electricity in the cobalt acid lithium secondary battery, and does not have and overcharge phenomenon.
Embodiment two
As shown in Figure 3; for the 48.1V of automobile-used 13 strings of electric motorcycle, when 15Ah LiMn2O4 secondary battery is charged; the total of LiMn2O4 secondary battery is being the serial connection charge power supply of 54.6V with a restriction of total negative two ends series connection output voltage just; and carry out serial connection charge with the restriction charging current of 3A; if it is that its voltage is when reaching over-charge protective voltage that arbitrary cell is full of electricity; then the battery management system in the LiMn2O4 secondary battery will cut off the serial connection charge power supply, and serial connection charge finishes.With a restriction output voltage is that 4.2V, restriction output current are that the charged in parallel power supply of 600mA carries out charged in parallel in turn the cell of each underfill, when every cell is full of electricity, and the charged in parallel end.So far, the charging process of LiMn2O4 secondary battery finishes.Adopt above-mentioned charging modes, every battery all can guarantee to be full of electricity in the LiMn2O4 secondary battery, and does not have and overcharge phenomenon.
Embodiment three
As shown in Figure 4; for the 345.6V of Hybrid Vehicle 108 strings, when 40Ah ferrous phosphate lithium secondary battery is charged; at first; the ferrous phosphate lithium secondary battery total just and a restriction of total negative two ends series connection output voltage be that 394.2V, restriction charging current are that the serial connection charge power supply of 80A carries out serial connection charge; being full of electricity as a cell is that its voltage is when reaching over-charge protective voltage; the batteries in battery set management system is with the serial connection charge dump, and serial connection charge finishes.Then, be that 3.65V, restriction output current are that the charged in parallel power supply of 1A is connected in parallel on each cell two ends and carries out charged in parallel with 108 restriction output voltages, be battery when being full of electricity when the voltage of every cell reaches 3.65V, charging finishes.
Embodiment four
As shown in Figure 5, during with 288V, the 100Ah ferrous phosphate lithium secondary battery charging of 90 strings, the batteries of 90 strings are divided into the ferrous phosphate lithium secondary battery modules of 9 10 strings for pure electric automobile.At first; each module total just and total negative two ends connect all one that to limit output voltage be that 36.5V, restriction charging current are that the serial connection charge power supply of 20A carries out serial connection charge; when arbitrary cell in the battery module is full of electricity is its voltage when reaching over-charge protective voltage, and the battery management system in the battery module disconnects the serial connection charge power supply of this battery module.Then, to this battery module, adopting 5 restriction output voltages is that 3.65V, restriction output current are that the charged in parallel power supply of 500mA carries out charged in parallel, and each charged in parallel power supply carries out charged in parallel for two cells in turn, when every cell is full of electricity, charged in parallel finishes.
The charging modes that serial connection charge in the foregoing description combines with the charged in parallel of constant voltage and current limiting can be general.
In addition, because charged in parallel adopts low-voltage, low current charge, therefore can select solar recharging power supply or wireless charging power supply in the present invention, thereby operation is more simple as the charged in parallel power supply.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the charging method of a lithium secondary battery, this lithium secondary battery have and are used to prevent the battery management system that overcharges from it is characterized in that the charging modes that described charging method adopts serial connection charge to combine with the charged in parallel of constant voltage and current limiting.
2. charging method according to claim 1 is characterized in that, the electric current of described serial connection charge is not less than 5 times of charged in parallel electric current.
3. charging method according to claim 1 is characterized in that, the charging modes that described charging method adopts serial connection charge and charged in parallel to carry out simultaneously.
4. charging method according to claim 1 is characterized in that, at the two ends of lithium secondary battery series connection serial connection charge power supply, is batteries charging; Monomer lithium secondary battery two ends in lithium secondary battery after serial connection charge finishes connect the charged in parallel power supply, for the monomer lithium secondary battery charges.
5. according to the arbitrary described charging method of claim 1 to 4, it is characterized in that, monomer lithium secondary battery number more for a long time in lithium secondary battery, lithium secondary battery is divided into the lithium secondary battery pack module that several comprise a minority lithium secondary battery, adopts serial connection charge to charge with the mode that the charged in parallel of constant voltage and current limiting combines to each lithium secondary battery pack module.
6. according to the arbitrary described charging method of claim 1 to 4, it is characterized in that the magnitude of voltage when the monomer lithium secondary battery is full of electricity in the constant voltage value of described charged in parallel power supply and the lithium secondary battery is identical.
7. charging device that charges for lithium secondary battery, this lithium secondary battery have and are used to prevent the battery management system that overcharges from it is characterized in that, also comprise: at least one serial connection charge power supply and at least one charged in parallel power supply; Described serial connection charge power supply is connected with the lithium secondary battery pack module in described lithium secondary battery or the lithium secondary battery; Described charged in parallel power supply is connected with monomer lithium secondary battery in described lithium secondary battery or the lithium secondary battery pack module.
8. charging device according to claim 7 is characterized in that, same described charged in parallel power supply is connected with every monomer lithium secondary battery in the described lithium secondary battery in turn charges.
9. charging device according to claim 7 is characterized in that, described charged in parallel power supply is solar recharging power supply or wireless charging power supply.
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| CNA2009100167244A CN101599560A (en) | 2009-07-06 | 2009-07-06 | The charging device of lithium secondary battery and charging method |
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| CNA2009100167244A CN101599560A (en) | 2009-07-06 | 2009-07-06 | The charging device of lithium secondary battery and charging method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122741A (en) * | 2010-01-08 | 2011-07-13 | 罗征南 | Storage battery with simultaneously rechargeable unit cells and multipath parallel-connected charger |
| CN103219756A (en) * | 2012-01-23 | 2013-07-24 | 电流通路公司 | Battery charging network |
| CN104578316A (en) * | 2015-01-28 | 2015-04-29 | 深圳市良益实业有限公司 | Battery pack distribution multi-mode equalizing charge method and equalizing charge circuit |
| CN104901393A (en) * | 2015-06-22 | 2015-09-09 | 罗民雄 | Method and circuit for controlling charging voltage of batteries in battery series connection charging circuit |
| CN108110335A (en) * | 2017-11-16 | 2018-06-01 | 国机智骏（北京）汽车科技有限公司 | The control method of the battery system of electric vehicle, electric vehicle and battery system |
| CN110014880A (en) * | 2017-12-31 | 2019-07-16 | 张朝辉 | A fast-charging electric vehicle battery pack electrical architecture |
| CN115566776A (en) * | 2022-11-09 | 2023-01-03 | 潍柴动力股份有限公司 | Power battery pack charging circuit, power battery pack charging method and device |
-
2009
- 2009-07-06 CN CNA2009100167244A patent/CN101599560A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122741A (en) * | 2010-01-08 | 2011-07-13 | 罗征南 | Storage battery with simultaneously rechargeable unit cells and multipath parallel-connected charger |
| CN103219756A (en) * | 2012-01-23 | 2013-07-24 | 电流通路公司 | Battery charging network |
| CN104578316A (en) * | 2015-01-28 | 2015-04-29 | 深圳市良益实业有限公司 | Battery pack distribution multi-mode equalizing charge method and equalizing charge circuit |
| CN104901393A (en) * | 2015-06-22 | 2015-09-09 | 罗民雄 | Method and circuit for controlling charging voltage of batteries in battery series connection charging circuit |
| CN108110335A (en) * | 2017-11-16 | 2018-06-01 | 国机智骏（北京）汽车科技有限公司 | The control method of the battery system of electric vehicle, electric vehicle and battery system |
| CN110014880A (en) * | 2017-12-31 | 2019-07-16 | 张朝辉 | A fast-charging electric vehicle battery pack electrical architecture |
| CN115566776A (en) * | 2022-11-09 | 2023-01-03 | 潍柴动力股份有限公司 | Power battery pack charging circuit, power battery pack charging method and device |
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Application publication date: 20091209 |