CN103580252B - A kind of electric automobile A-battery charging system and charging method thereof - Google Patents
A kind of electric automobile A-battery charging system and charging method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of electric automobile A-battery charging system and charging method thereof.Charging system comprises main control loop, voltage sample loop, power battery pack, subloop control switch, subloop gating switch, transformer and major loop control switch.Main control loop output is connected with major loop control switch with subloop switch, voltage sample loop input is connected with main control loop output with power battery pack respectively, voltage sample loop output is connected with main control loop input, A-battery is connected with transformer by major loop control switch, and power battery pack is connected with transformer by subloop switch.A kind of electric automobile A-battery charging method, by carrying out sampling analysis to battery cell magnitude of voltage in power battery pack, discharge to there being high-tension battery cell, charge to there being the battery cell of low voltage, both achieve the mutual transfer of energy between A-battery and power battery pack, in turn ensure that the balancing energy of power battery pack.
Description
Technical field
The present invention relates to batteries of electric automobile technical field, be specifically related to a kind of electric automobile A-battery charging system without Vehicular charger and charging method thereof.
Background technology
Since entering 21 century, energy saving standard becomes the focus of energy problem.Along with the high speed development of new century Domestic Automotive Industry, the recoverable amount of China's automobile also constantly increases.Automobile enters daily life in a large number, and the thing followed is but day by day serious environmental problem.Therefore, we need to expand to the development of auto industry the environmental protection and economized path that make new advances.The appearance of electric automobile then can solve this predicament preferably, there is not fuel oil problem and motor vehicle exhaust emission problem in electric automobile, so become the focus of the world today to the research and development of electric automobile, country has dropped into a large amount of funds, domestic Duo Suo colleges and universities, Ge great motor corporation also all have developed various types of electric automobile.
Also there are many needs and solve and perfect problem in the development of electric automobile, wherein just comprises the research of electrokinetic cell and efficient charging method thereof.At present, electric automobile low-voltage electrical part controls to adopt low pressure 24V or 12V powered battery.Because there is no Vehicular charger, so usually adopt the DC/DC electric pressure converter of a low pressure to convert high pressure to low pressure, charge to A-battery.This charging modes can make the voltage between each battery cell of power battery pack unbalanced, and the fail safe of power battery pack and useful life are declined greatly.Because the long-term work of DC/DC electric pressure converter in a high voltage state, so require higher to the resistance to pressure of its internal components.When charging current is larger, DC/DC electric pressure converter can be made to damage because of excess temperature or overvoltage, and then make A-battery operation irregularity, affect car load and normally travel.
Summary of the invention
The object of the present invention is to provide a kind of electric automobile A-battery charging system and charging method thereof, this charging system and charging method thereof are undertaken effectively mutually shifting by the power battery pack and A-battery energy making electric automobile, not only can ensure the balancing energy between power battery pack and A-battery, realize charging without Vehicular charger, also can not cause damage to electric automobile electric part structure, impact normally travels, have structure simply, feature safely and efficiently.
For achieving the above object, present invention employs following technical scheme: a kind of electric automobile A-battery charging system, comprise power battery pack and A-battery, this charging system also comprises main control loop, voltage sample loop, subloop switch, transformer and major loop control switch; The output of described main control loop is connected with major loop control switch with subloop switch respectively, described voltage sample loop is connected alternately with main control loop, the input in described voltage sample loop is connected with power battery pack, described A-battery is connected with transformer by major loop control switch, and described power battery pack is connected with transformer by subloop switch.Specifically, described A-battery is 24V A-battery or 12V A-battery, and described power battery pack comprises multiple battery case.Described voltage sampling circuit and described main control loop are bi-directionally connected, the main control loop driving voltage sample circuit that transmits control signal is sampled, after sampling completes, sampled value is turned back to again main control loop and carries out analysis judgement by voltage sampling circuit, so that main control loop sends control signal according to analysis judged result to each switch.
Described subloop switch comprises subloop control switch and subloop gating switch, described subloop control switch is all connected with the output of main control loop with subloop gating switch, and described power battery pack is connected with described transformer with subloop gating switch by subloop control switch.
Described transformer is switch transformer.Switch transformer can either realize the conversion of voltage, can ensure again the stable of voltage in the process of voltage transitions.
One lateral coil of described transformer is connected with the both positive and negative polarity of A-battery by major loop control switch, and opposite side coil is connected with the both positive and negative polarity of power battery pack with subloop control switch by subloop gating switch.Described switch transformer is Multiple coil high frequency transformer.By the difference of the number of turn of Multiple coil and winding, under the cooperation of each way switch, the discharge and recharge to different voltage apparatus can be realized.
Described major loop control switch is switching tube.Can be disconnected with closed by control switch pipe carrying out at a high speed by pulse signal, thus both avoided and directly connect A-battery and transformer makes A-battery short circuit, damage is caused to A-battery, macro-energy can be produced again and make circuit stability.
The invention still further relates to a kind of charging method of above-mentioned electric automobile A-battery charging system, this charging method comprises the following steps:
(1) power battery pack is divided into some battery cases, gathers the magnitude of voltage of each battery cell in each battery case;
(2) the whole magnitudes of voltage collected are analyzed, according to comparative analysis result, charge or discharge operation are carried out to battery cell;
(3) step (1) is repeated.
Specifically, the whole magnitudes of voltage collected are analyzed described in step (2), according to comparative analysis result, the detailed process of battery cell being carried out to charge or discharge operation is:
A. the size of all batteries cell voltage value in more each battery case, obtains maximum voltage value and minimum amount of voltage that;
B. set an electric discharge standard voltage value and a rechargeable standard magnitude of voltage, the maximum voltage value obtained in step a and electric discharge standard voltage value are compared, minimum amount of voltage that and rechargeable standard magnitude of voltage compare;
If maximum voltage value is greater than electric discharge standard voltage value, then the battery cell with this maximum voltage value is discharged, by the energy trasfer in this battery cell in A-battery;
If minimum amount of voltage that is less than rechargeable standard magnitude of voltage, then the battery cell with this minimum amount of voltage that is charged, by the energy trasfer in A-battery in this battery cell.
Further, described in step (2) by the energy trasfer in this battery cell to the detailed process in A-battery be: the major loop control switch that main control loop controls this battery cell place major loop closes, and the side coil of A-battery and transformer forms power battery pack discharge loop; Main control loop controls the subloop gating switch of this battery cell place subloop, subloop control switch closes, and the opposite side coil of this battery cell and transformer forms A-battery charge circuit.
Further, described in step (2) by the energy trasfer in A-battery to the detailed process in this battery cell be: the major loop control switch that main control loop controls this battery cell place major loop closes, the side coil of A-battery and transformer is made to form A-battery discharge loop, main control loop controls the subloop gating switch of this battery cell place subloop, subloop control switch closes, and makes the opposite side coil of this battery cell and transformer form power battery pack charge circuit.
Operation principle of the present invention is:
High pressure required for electric automobile work is provided by power battery pack, and power battery pack is divided into several battery cases, and each battery case is in series by multiple battery cell.Due to uncertain factors such as material, production, manufacturing process, the voltage of each battery cell has certain difference.Along with the circulation of discharge and recharge, this species diversity can be increasing.In discharge process, the capacity of whole power battery pack depends on the monomer that in all monomers, voltage is minimum; In charging process, the electricity be filled with depends on the monomer that in whole power battery pack, in all monomers, voltage is the highest.Therefore, when electric automobile runs, need to carry out electric voltage equalization to the monomer that the voltage of all battery cells is high or minimum in real time, namely carry out energy trasfer.
Charging system of the present invention and charging method thereof, main control loop, major loop control switch, subloop gating switch, subloop control switch and transformer common coordinate under, not only can by the energy trasfer of battery cell higher for voltage in power battery pack in A-battery, realize charging without Vehicular charger mode, can also the energy back in A-battery be transferred in the lower battery cell of voltage in power battery pack simultaneously.Transformer used in the present invention is the Multiple coil high frequency transformer that can carry out bidirectional energy conversion.By Multiple coil, under the cooperation of each switch, the transfer of bidirectional energy can be carried out by electromagnetic induction principle.Power battery pack comprises multiple battery case, at one time section, has multiple battery case with high voltage battery cell and charges to A-battery, and the battery cell also having A-battery lower to voltage in multiple battery case charges.The circuit of each carry circuit is 2 ~ 5A, is set standard discharge voltage value and standard charge voltage value by software, and can realize tens of road in whole charging system and carry out energy trasfer simultaneously, total current can reach tens amperes.
The charging principle figure of power battery pack as shown in Figure 4, the battery cell that wherein PK3 is major loop control switch, PK1 and PK2 be subloop gating switch, K1 ~ K5 is subloop control switch, B1 ~ B4 is power battery pack, T1 are switch transformer, and T1 is a Multiple coil high frequency transformer that can carry out bidirectional energy conversion.Main control loop gathers the magnitude of voltage of each battery cell B1 ~ B4 by voltage sample loop, and magnitude of voltage is carried out size compare, obtain the magnitude of voltage that maximum voltage value is set to battery cell B1, and the electric discharge standard voltage value of establishing the magnitude of voltage of B1 to be greater than to arrange in system.So, main control loop controls subloop gating switch PK2, subloop control switch K1 and K2, major loop control switch PK3 are closed.Now, battery cell B1 forms power battery pack discharge loop, as shown in dotted arrow loop in Fig. 4 through the winding 1 and 2 of the right side coil of K1, K2, PK2 and switch transformer T1.Electric current arrives the negative pole of B1 through winding 1 and 2 from the positive pole of B1, form current circuit.A-battery B forms A-battery charge circuit, as realized shown in the direction of arrow in Fig. 4 through the winding 4 and 5 of PK3 and switch transformer T1.When having electric current to flow through in the winding 1 and 2 of switch transformer T1, according to electromagnetic induction principle, induced current can be produced in the winding 4 and 5 of switch transformer T1, this induced current flows into A-battery through major loop switch P K3, complete the charging to A-battery, namely by main control loop, the cooperation of each switch and the power conversion of transformer, the energy trasfer of the battery cell with higher voltage value has been arrived in A-battery.
The electric discharge electrical schematic diagram of power battery pack as shown in Figure 5, the battery cell that wherein PK6 is major loop control switch, PK4 and PK5 be subloop gating switch, K6 ~ K10 is subloop control switch, B5 ~ B8 is power battery pack, T2 are switch transformer, T2 be one can the Multiple coil high frequency transformer of bidirectional energy conversion.Main control loop gathers the magnitude of voltage of each battery cell B5 ~ B8 by voltage sample loop, and magnitude of voltage is carried out size compare, obtain the magnitude of voltage that minimum amount of voltage that is set to battery cell B7, and the rechargeable standard magnitude of voltage establishing the magnitude of voltage of B7 to be less than to arrange in system.So, main control loop controls subloop gating switch PK5, subloop control switch K8 and K9, major loop control switch PK5 are closed.Now, battery cell B7 forms power battery pack charge circuit, as shown in dotted arrow direction in Fig. 5 through the winding 6 and 7 of the right side coil of K8, K9, PK5 and switch transformer T2.A-battery coil windings 9 and 10 on the left of PK6 and switch transformer T2 forms A-battery discharge loop, the electric current of discharge loop from the positive pole of B through PK6, winding 9 and 10, arrive the negative pole of B, form current circuit, as shown in solid arrow direction in Fig. 5.When having electric current to flow through in the winding 9 and 10 of switch transformer T1, according to electromagnetic induction principle, can produce induced current in winding 6 and 7, this induced current flows into B7 through PK5, K8, completes the charging to battery cell B7.By main control loop, the cooperation of each switch and the power conversion of transformer, by the energy trasfer in A-battery to having in the battery cell of lower voltage value.
Advantage of the present invention:
(1) a kind of electric automobile A-battery charging system of the present invention, Real-time Collection is carried out by the magnitude of voltage of voltage sample loop to each battery cell in power battery pack, main control loop controls subloop switch and the break-make of major loop control switch and the voltage transitions of switch transformer according to the magnitude of voltage gathered, both achieve the charging to A-battery, in turn ensure that the equilibrium of energy in power battery pack.
(2) a kind of electric automobile A-battery charging method of the present invention, by carrying out sampling analysis to the magnitude of voltage of battery cell in power battery pack, discharge operation is carried out to the battery cell with high voltage, charging operations is carried out to the battery cell with low voltage, thus the energy trasfer both achieved between A-battery and power battery pack, in turn ensure that the equilibrium of power battery pack energy.
In sum, the present invention, by under the cooperatively interacting of main control loop, voltage sample loop, major loop control switch, subloop switch and transformer, achieves the mutual transfer of energy between A-battery and power battery pack.This also achieves the balance charge/discharge to the inconsistent battery cell of power battery voltage, improves charge efficiency while instead of conventional Vehicular charger, ensure that charging quality, extends the useful life of electric automobile.
Accompanying drawing explanation
Fig. 1 is the structural representation of charging system of the present invention;
Fig. 2 is existing electric automobile A-battery charging principle figure;
Fig. 3 is circuit theory diagrams of the present invention;
Fig. 4 is power battery pack charging principle figure of the present invention;
Fig. 5 is power battery pack discharge principle figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
A kind of electric automobile A-battery charging system as shown in Figure 1, comprise power battery pack and A-battery, this charging system also comprises main control loop, voltage sample loop, subloop switch, transformer and major loop control switch; The output of described main control loop is connected with major loop control switch with subloop switch respectively, described voltage sample loop is connected alternately with main control loop, the input in described voltage sample loop is connected with power battery pack, described A-battery is connected with transformer by major loop control switch, and described power battery pack is connected with transformer by subloop switch.Specifically, described A-battery is 24V A-battery or 12V A-battery, and described power battery pack comprises multiple battery case.
Further, described subloop switch comprises subloop control switch and subloop gating switch, described subloop control switch is all connected with the output of main control loop with subloop gating switch, and described power battery pack is connected with described transformer with subloop gating switch by subloop control switch.
Further, described transformer is switch transformer.Specifically, a lateral coil of described transformer is connected with the both positive and negative polarity of A-battery by major loop control switch, and opposite side coil is connected with the both positive and negative polarity of power battery pack with subloop control switch by subloop gating switch.
Further, described major loop control switch is switching tube.
The invention still further relates to a kind of charging method of above-mentioned electric automobile A-battery charging system, this charging method comprises the following steps:
(1) power battery pack is divided into some battery cases, gathers the magnitude of voltage of each battery cell in each battery case;
(2) the whole magnitudes of voltage collected are analyzed, according to comparative analysis result, charge or discharge operation are carried out to battery cell;
(3) step (1) is repeated.
Specifically, the whole magnitudes of voltage collected are analyzed described in step (2), according to comparative analysis result, the detailed process of battery cell being carried out to charge or discharge operation is:
A. the size of all batteries cell voltage value in more each battery case, obtains maximum voltage value and minimum amount of voltage that;
B. set an electric discharge standard voltage value and a rechargeable standard magnitude of voltage, the maximum voltage value obtained in step a and electric discharge standard voltage value are compared, minimum amount of voltage that and rechargeable standard magnitude of voltage compare;
If maximum voltage value is greater than electric discharge standard voltage value, then the battery cell with this maximum voltage value is discharged, by the energy trasfer in this battery cell in A-battery;
If minimum amount of voltage that is less than rechargeable standard magnitude of voltage, then the battery cell with this minimum amount of voltage that is charged, by the energy trasfer in A-battery in this battery cell.
Further, described in step (2) by the energy trasfer in this battery cell to the detailed process in A-battery be: the major loop control switch that main control loop controls this battery cell place major loop closes, and the side coil of A-battery and transformer forms power battery pack discharge loop; Main control loop controls the subloop gating switch of this battery cell place subloop, subloop control switch closes, and the opposite side coil of this battery cell and transformer forms A-battery charge circuit.
Further, described in step (2) by the energy trasfer in A-battery to the detailed process in this battery cell be: the major loop control switch that main control loop controls this battery cell place major loop closes, the side coil of A-battery and transformer is made to form A-battery discharge loop, main control loop controls the subloop gating switch of this battery cell place subloop, subloop control switch closes, and makes the opposite side coil of this battery cell and transformer form power battery pack charge circuit.
Specific works process of the present invention is:
Circuit theory diagrams as shown in Figure 3, for ease of understanding, are reduced to two Battery pack casees in figure 3 by power battery pack, in actual application, the quantity of the battery case in power battery pack, the quantity of cell can be different because specification is different.Wherein, B1 ~ B8 is the battery cell in power battery pack, B1 ~ B4 is a battery case in power battery pack, B5 ~ B8 is another battery case in power battery pack, B is A-battery, PK3 and PK6 is major loop control switch, and PK1, PK2, PK4 and PK5 are subloop gating switch, and K1 ~ K10 is subloop control switch.First, voltage sample loop gathers the magnitude of voltage of battery cell in power battery pack, and obtains maximum voltage value in each battery case and minimum amount of voltage that by comparing size.Secondly, according to the practical operation situation of power battery pack, by software set one electric discharge standard voltage value and a rechargeable standard magnitude of voltage, and the maximum voltage value obtained in each battery case, minimum amount of voltage that are compared with electric discharge standard voltage value, rechargeable standard magnitude of voltage respectively.If maximum voltage value is greater than electric discharge standard voltage value, then the battery cell with this maximum voltage value is discharged, by the energy trasfer in this battery cell in A-battery; If minimum amount of voltage that is less than rechargeable standard magnitude of voltage, then the battery cell with this minimum amount of voltage that is charged, by the energy trasfer in A-battery in this battery cell, in other situations, discharge and recharge operation is not carried out to the battery cell in power battery pack.
Suppose in the battery case of the top in Fig. 3 have maximum voltage value for battery cell B1, and this maximum voltage value is greater than electric discharge standard voltage value, have minimum amount of voltage that for battery cell be B2, and this minimum amount of voltage that is not less than rechargeable standard magnitude of voltage, so major loop control switch PK3, subloop gating switch PK2, subloop control switch K1 and K2 is all closed, A-battery B forms A-battery through the side coil of PK3 and transformer and to charge closed-loop path, battery cell B1 is through K1, K2, the opposite side coil of PK2 and transformer forms power battery pack and to discharge closed-loop path.Electric current in power battery pack electric discharge closed-loop path produces induced current through transformer in A-battery charging closed-loop path, A-battery is charged, achieves and the energy trasfer of the battery cell in the battery case of top with maximum voltage value has been arrived in A-battery.Suppose in Fig. 3 in underlying battery case have maximum voltage value for battery cell B8, and this maximum voltage value is not more than electric discharge standard voltage value, that have minimum amount of voltage that is battery cell B5, and this minimum amount of voltage that is less than rechargeable standard magnitude of voltage, then major loop control switch PK6, subloop gating switch PK5, subloop control switch K6 and K7 are all closed, A-battery forms A-battery through the side coil of PK6 and transformer and to discharge closed-loop path, and battery cell B5 forms power battery pack through the opposite side coil of K6, K7, PK5 and transformer and to charge closed-loop path.The electric current produced in A-battery electric discharge closed-loop path produces induced current through transformer in power battery pack charging closed-loop path, battery cell B8 is charged, thus achieves the energy trasfer in A-battery is had in the battery cell of minimum amount of voltage that in underlying battery case.Other situations the like.
In sum, a kind of electric automobile A-battery charging system of the present invention, Real-time Collection is carried out by the magnitude of voltage of voltage sample loop to each battery cell in power battery pack, main control loop controls subloop switch and the break-make of major loop control switch and the voltage transitions of switch transformer according to the magnitude of voltage gathered, both achieve the charging to A-battery, in turn ensure that the equilibrium of energy in power battery pack.A kind of electric automobile A-battery charging method of the present invention, by carrying out sampling analysis to the magnitude of voltage of battery cell in power battery pack, discharge operation is carried out to the battery cell with high voltage, charging operations is carried out to the battery cell with low voltage, thus the energy trasfer both achieved between A-battery and power battery pack, in turn ensure that the equilibrium of power battery pack energy.The present invention, by under the cooperatively interacting of main control loop, voltage sample loop, major loop control switch, subloop switch and transformer, achieves the mutual transfer of energy between A-battery and power battery pack.This also achieves the balance charge/discharge to the inconsistent battery cell of power battery voltage, improves charge efficiency while instead of conventional Vehicular charger, ensure that charging quality, extends the useful life of electric automobile.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determines.
Claims (2)
1. an electric automobile A-battery charging system, comprises power battery pack and A-battery, it is characterized in that: this charging system also comprises main control loop, voltage sample loop, subloop switch, transformer and major loop control switch; The output of described main control loop is connected with major loop control switch with subloop switch respectively, described voltage sample loop is connected alternately with main control loop, the input in described voltage sample loop is connected with power battery pack, described A-battery is connected with transformer by major loop control switch, and described power battery pack is connected with transformer by subloop switch;
Described subloop switch comprises subloop control switch and subloop gating switch, described subloop control switch is all connected with the output of main control loop with subloop gating switch, and described power battery pack is connected with described transformer with subloop gating switch by subloop control switch;
Described transformer is switch transformer;
Described power battery pack comprises multiple battery case;
One lateral coil of described transformer is connected with the both positive and negative polarity of A-battery by major loop control switch, and opposite side coil is connected with the both positive and negative polarity of power battery pack with subloop control switch by subloop gating switch;
Described major loop control switch is switching tube;
Described voltage sample loop gathers the magnitude of voltage of each battery cell of described battery case, maximum voltage value and minimum amount of voltage that is obtained by the size comparing all batteries cell voltage value, main control loop controls the break-make of subloop switch and major loop control switch and the conversion of switch transformer with the comparative result of electric discharge standard voltage value, rechargeable standard magnitude of voltage respectively according to the maximum voltage value obtained, minimum amount of voltage that, thus realizes the transfer of the energy between described A-battery and described power battery pack.
2. the charging method of a kind of electric automobile A-battery charging system according to claim 1, is characterized in that: this charging method comprises the following steps:
(1) power battery pack is divided into some battery cases, gathers the magnitude of voltage of each battery cell in each battery case;
(2) the whole magnitudes of voltage collected are analyzed, according to comparative analysis result, charge or discharge operation are carried out to battery cell;
The whole magnitudes of voltage collected are analyzed described in step (2), according to comparative analysis result, the detailed process of battery cell being carried out to charge or discharge operation is:
A. the size of all batteries cell voltage value in more each battery case, obtains maximum voltage value and minimum amount of voltage that;
B. set an electric discharge standard voltage value and a rechargeable standard magnitude of voltage, the maximum voltage value obtained in step a and electric discharge standard voltage value are compared, minimum amount of voltage that and rechargeable standard magnitude of voltage compare;
If maximum voltage value is greater than electric discharge standard voltage value, then the battery cell with this maximum voltage value is discharged, by the energy trasfer in this battery cell in A-battery; Described by the energy trasfer in this battery cell to the detailed process in A-battery is: the major loop control switch that main control loop controls this battery cell place major loop closes, and the side coil of A-battery and transformer forms power battery pack discharge loop; Main control loop controls the subloop gating switch of this battery cell place subloop, subloop control switch closes, and the opposite side coil of this battery cell and transformer forms A-battery charge circuit;
If minimum amount of voltage that is less than rechargeable standard magnitude of voltage, then the battery cell with this minimum amount of voltage that is charged, by the energy trasfer in A-battery in this battery cell; Described by the energy trasfer in A-battery to the detailed process in this battery cell is: the major loop control switch that main control loop controls this battery cell place major loop closes, the side coil of A-battery and transformer is made to form A-battery discharge loop, main control loop controls the subloop gating switch of this battery cell place subloop, subloop control switch closes, and makes the opposite side coil of this battery cell and transformer form power battery pack charge circuit;
(3) step (1) is repeated.
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| CN104505926B (en) * | 2014-12-31 | 2017-02-22 | 深圳先进技术研究院 | Power battery pack charging system and method |
| CN104953675B (en) * | 2015-07-14 | 2018-05-04 | 北京友信宏科电子科技有限公司 | Energy management equipment, electric-control system and electric-control method, electric automobile |
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| CN102651560A (en) * | 2011-02-23 | 2012-08-29 | 欣旺达电子股份有限公司 | Automobile lithium battery discharging balance method and balance system |
| CN102148518A (en) * | 2011-03-18 | 2011-08-10 | 清华大学深圳研究生院 | Secondary battery pack charging and discharging dynamic feedback equalizing device and method |
| CN102856936A (en) * | 2011-06-29 | 2013-01-02 | 北汽福田汽车股份有限公司 | Device for balancing power batteries |
| EP2562030A2 (en) * | 2011-08-24 | 2013-02-27 | General Electric Company | Apparatus and method for charging an electric vehicle |
| CN202319957U (en) * | 2011-12-05 | 2012-07-11 | 惠州市亿能电子有限公司 | Lossless balanced control circuit of vehicle-mounted power battery pack |
| CN203562806U (en) * | 2013-11-12 | 2014-04-23 | 安徽安凯汽车股份有限公司 | Electric-automobile low-voltage battery charging system |
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| CN103580252A (en) | 2014-02-12 |
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