CN101976866B - Balanced judgment and supplementary device of energy transfer type battery pack and method thereof - Google Patents
Balanced judgment and supplementary device of energy transfer type battery pack and method thereof Download PDFInfo
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Abstract
The invention relates to a balanced judgment and supplementary method of an energy transfer type battery pack, which are mainly used on occasions when numerous batteries are connected in series for use in industry. The device comprises balancing modules and a measurement and control module, wherein the balancing modules are connected in turns, are connected with each single battery, and charge the single battery by using the energy of the battery pack or the energy of an external power supply; the measurement and control module is connected with the battery pack and each single battery therein, and measures and compares the single battery. The method comprises the following steps of: measuring and controlling the total voltage of battery packs connected in series and the voltage of each single battery; calculating the average voltage of the batteries of the battery packs connected in series; sending starting/stopping signals; and making the voltage of the single battery approach to the average voltage of the battery packs. The device and the method have the advantages of having the function of ensuring the voltage balancing, which is performed in a mode of energy transfer, of the single batteries of the battery packs connected in series in use, having small losses, and being favorable to be applied to middle or large-capacity battery packs.
Description
Technical field
The present invention relates to a kind of energy transfer type battery pack balancing and judge and compensation process, belong to the battery technology field.
Background technology
To important power supply unit, all need a cover battery as stand-by power supply in the commercial Application, and single battery voltage is not high, can't directly use, and generally all is that tens even the hundreds of battery raising total voltage that is together in series is used.Because battery can performance occur unavoidably in manufacturing and use inconsistent, therefore when series battery is discharged and recharged, adopt the voltage of balanced each cell of certain method, can improve the usage degree of battery, prolong the useful life of battery.The more current method that are arranged the series battery charge and discharge balancing; Adopt the method for resistance power consumption mostly, promptly, discharge through resistance to the cell of overtension in the battery pack; To guarantee that battery is consistent in the battery pack; The equalization methods shortcoming of this mode is that energy consumption is high, and loss is big, is unfavorable for especially under the situation that big capacity series battery discharges and recharges, carrying out equilibrium.
Summary of the invention
The present invention seeks to, solve existing in prior technology and series battery is discharged and recharged the technical problem that is unfavorable under the situation that big capacity series battery discharges and recharges, carrying out equilibrium etc.; A kind of employing constant current control model is provided, can with the original charging/discharging apparatus of series battery common use be independent of each other, have a kind of energy transfer type battery pack balancing that ensures series battery in use balanced function and the balanced mode that adopts energy to shift of monomer battery voltage carried out, loss is little, helps being applied to medium or jumbo battery pack and judge and compensation process.
Above-mentioned technical problem of the present invention is able to solve through following technical proposals:
A kind of energy transfer type battery pack balancing that utilizes judges and compensation process that its energy transfer type battery pack balancing is judged and supplementary device comprises:
The balance module and the control module that connect successively; Said balance module is connected with each cell, utilizes the energy of battery pack or the energy of external power source to charge for cell; Control module: be connected with battery pack and each cell wherein, measurement is also compared cell, judges whether this cell needs makeup energy and send starting/stop signal to said balance module;
Described balance module comprises:
Be used for PWM switching regulator DC-DC converter that cell is charged; Measuring resistance or transducer; The output of said PWM switching regulator DC-DC converter is carried out the constant current control unit of constant current control; Drive the driver element of the switching device in the PWM switching regulator DC-DC converter; Receive the isolated controlling unit that above-mentioned control module sends starting/stop signal;
Said PWM switching regulator DC-DC converter and driver element, and measuring resistance or transducer is connected: the constant current control unit with measuring resistance, driver element, reach isolated controlling unit 7 and be connected;
Balanced judgement and compensation process may further comprise the steps:
Step 5.1, measure series battery total voltage and each monomer battery voltage of this unit, difference side of fortune output by the difference amplifier unit in the control module;
Step 5.2, calculate the average voltage of series-connected cell Battery pack according to series battery total voltage measured in the step 5.1 and each monomer battery voltage by the difference amplifier unit in the control module;
Step 5.3, by the size of monomer battery voltage and battery pack average voltage relatively of the comparing unit in the control module, and,, promptly select execution in step 5.4 or step 5.5 to above-mentioned isolated controlling unit transmission starting/stop signal according to its comparative result;
When step 5.4, monomer battery voltage are lower than the battery pack average voltage, then start balance module, thereby the make-up monomers energy content of battery makes monomer battery voltage level off to the battery pack average voltage, and returns execution in step 5.3 through I/O;
Step 5.5, monomer battery voltage are greater than or equal to the battery pack average voltage, then stop balance module through I/O, no longer to the cell makeup energy and return execution in step 5.3.
In its step 5.4 of said method, the make-up monomers energy content of battery is promptly following to the concrete steps that cell charges:
Step 6.1, received the initiating signal that the comparing unit in the control module sends, promptly selected execution in step 6.2, as receive stop signal, promptly selected execution in step 6.3 like the isolated controlling unit in the balance module;
In step 6.2, the balance module: the isolated controlling unit is converted into the signal of telecommunication that balance module is discerned with initiating signal, is input to the constant current control unit, and constant current control unit control PWM switching regulator DC-DC converter charges;
In step 6.3, the balance module: the isolated controlling unit is converted into the signal of telecommunication that balance module is discerned with stop signal, is input to the constant current control unit, and constant current control unit control PWM switching regulator DC-DC converter stops charging.
Said method, its PWM switching regulator DC-DC converter is 10%～50% of the specified charging current size of series battery to cell charging current size.
Said method, its control module comprise the difference amplifier unit that connects successively, and it is connected with above-mentioned battery pack two ends and cell, is used to measure battery pack and monomer battery voltage; Also have comparing unit, constitute by comparator and amplifier or programmable logic controller (PLC) spare, and have I/O output.
Said method; Its PWM switching regulator DC-DC converter adopts isolated form; Be flyback or normal shock type or semi-bridge type or bridge-type; Described PWM switching regulator DC-DC converter is input as the part or all of cell voltage or the external power source of series battery, is output as corresponding cell.
Therefore; The present invention has following advantage: 1. the PWM switching regulator DC-DC converter that has adopted isolated form; A part in the series battery or all batteries voltage (also can connect external power source) are carried out auxiliary charging to the battery that is lower than average voltage; Consume the energy of all the other batteries on the one hand, replenished the energy of the battery that is lower than average voltage on the one hand, can play the effect of each monomer battery voltage of balancing battery group; Loss simultaneously is very low, help this device in, the occasion of large-capacity battery pack uses; 2. adopt the PWM switching regulator DC-DC converter of isolated form, and its constant current control unit employing constant current control model, can charge to battery jointly with the original charging device of series battery is independent of each other.
Description of drawings
Fig. 1 is a structural principle sketch map of the present invention;
Fig. 2 is the circuit theory diagrams of the balance module of embodiment;
Fig. 3 is the circuit theory diagrams that among Fig. 2 measuring resistance 4 usefulness transducers 10 substituted;
Fig. 4 is the circuit theory diagrams of the control module of embodiment.
Corresponding figure number is called with name among the figure: balance module 1, control module 2, PWM switching regulator DC-DC converter 3, measuring resistance 4, constant current control unit 5, driver element 6, isolated controlling unit 7, difference amplifier unit 8, comparing unit 9, transducer 10.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Judgement of a kind of energy transfer type of the present invention battery pack balancing and supplementary device are as shown in Figure 1, and what it connected successively is: wherein balance module 1: be connected with each cell, utilize the energy of battery pack or the energy of external power source to charge for cell; Control module 2: be connected with battery pack and each cell wherein, measurement is also compared cell, judges whether this cell needs makeup energy and send starting/stop signal to said balance module 1.Described balance module 1 has: one of which, PWM switching regulator DC-DC converter 3: be used for cell is charged; Two, measuring resistance 4 or transducer 10: be used to measure output current; Three, the constant current control unit 5: constant current control is carried out in the output of said PWM switching regulator DC-DC converter; Four, driver element 6: drive the switching device in the PWM switching regulator DC-DC converter; Five, the isolated controlling unit 7: receive above-mentioned control module 2 and send starting/stop signals.What described control module 2 connected successively has: one of which, difference amplifier unit 8: be connected with above-mentioned battery pack two ends and cell, be used to measure battery pack and monomer battery voltage; Two, comparing unit 9: be made up of comparator and amplifier or programmable logic controller (PLC) spare, and have I/O output.Described PWM switching regulator DC-DC converter 3 adopts isolated form; Like flyback or normal shock type or semi-bridge type or bridge-type; Described PWM switching regulator DC-DC converter 3 is input as the part or all of cell voltage or the external power source of series battery, is output as corresponding cell.
Further specify as follows using instance: this device comprises with one or more (relevant with the cell number), is the balance module 1 that DC-DC converter 3, measuring resistance 4 or transducer 10, constant current control unit 5, driver element 6 and isolated controlling unit 7 constitute by the PWM switch of isolated form; A control module 2 that constitutes by difference amplifier unit 8 and comparing unit 9.Connected mode between the above assembly is: balancer of the present invention is made up of 8 balance modules 1 and a control module 2, and control module 2 wherein is wired to battery pack and each battery two ends; The method that connects of balance module 2 is: the input of balance module connects a part or whole voltage or outside other power supplys of battery pack, and output is connected to the cell two ends; The I/O of each comparing unit 9 of control module 2 outputs to the isolated controlling unit 7 of the balance module 1 that corresponding battery connects.
The operation principle of balance module 1 among this embodiment:
As shown in Figure 2; Present embodiment is an example with a forward converter; PWM switching regulator DC-DC converter 3 as isolated form; The both positive and negative polarity of series battery is connected to the input side of forward converter, and the both positive and negative polarity of corresponding cell is connected to the outlet side of forward converter, thereby realizes the cell makeup energy to being connect; Output is connected with the resistance of a low resistance as measuring resistance 4 or transducer 10; It is used to measure the size of current of output; And convert it to magnitude of voltage; Generally consider the factor of loss, the power that the resistance of measuring resistance 4 or transducer 10 selects to make the electric current that flows through to produce is no more than the upper limit that resistance can bear, and the resistance of generally selecting measuring resistance is between 0.005 Ω～1 Ω; Constant current control unit 5 is a PWM modulator; Operation principle is: by amplifier the magnitude of voltage of measuring resistance 4 or transducer 10 inputs is amplified and input to error amplifier with the electric current set-point; The output of error amplifier is connected to comparator; Compare the rectangular pulse that obtains driving with triangular wave.The electric current real output value is higher than set point when the magnitude of voltage of measuring resistance 4 or transducer 10 raises, and its comparison point with triangular wave raises, thereby the rectangular pulse duty ratio of driving reduces, thereby reduces the real output value of electric current, and vice versa.So constant current control unit 5 guarantees the PWM switching regulator DC-DC converter 3 constant currents output of isolated form; Driver element 6 has adopted an Isolated Pulse Transformer, the rectangular pulse of the driving of its input termination comparator output, and output connects the switch element of forward converter, and the former secondary of transformer is isolated; The I/O port of comparing unit 9 correspondences of isolated controlling unit 7 input termination control modules; Make the metal-oxide-semiconductor of an error amplifier output that is connected to constant current control unit 5 controlled; When receiving the high level that control module 2 provides; It is low making the error amplifier output current potential of constant current control unit 5; Can stop PWM switching regulator DC-DC converter 3 output of isolated form, when receiving the low level that control module 2 provides, PWM switching regulator DC-DC converter 3 outputs of then opening isolated form.
The operation principle of control module 2 among this embodiment:
As shown in Figure 3, present embodiment is to realize judging function that whether monomer battery voltage need replenish with analog circuit.Difference amplifier unit 8 usefulness a plurality of (number is cell number+1) individual operational amplifier, be connected into like the form among Fig. 3, realize conversion to cell and battery voltage.And each comparator of comparing unit 9 compares the output of difference amplifier 9 and the output of difference amplifier 1 ~ 8; The isolated controlling unit 7 of the balance module 1 that corresponding battery connects is received in the output of each comparator, to the startup of each balance module 1 with stop to control.Like Fig. 3; The parameter of difference amplifier 1 ~ 8 is consistent; The difference amplifier 1 that is connected with cell B1 below and the parameter and the circuit function of comparator 1 are analyzed; The parameter of difference amplifier 2 ~ 8 and comparator 2 ~ 8 and function are consistent with difference amplifier 1, judge that the method whether cell B1 voltage need replenish is following:
Suppose that monomer battery voltage is Vx, battery cell voltage is Vs, total battery n (this routine n=8) of battery pack, R2/R1=K1, R4/R3=K2.In the unit, the difference side of fortune 8, the output Vo1=K1*Vx of difference fortune side 1, the output Vo9=K2*Vs of difference amplifier 9.
The scope of design Vo1 is in the operational amplifier fan-out capability, and present embodiment is got Vo1 and equaled the half the of the operational amplifier output upper limit, is assumed to be a, i.e. Vo1=a, i.e. value K1=a/Vx;
Design Vo9 equals or a little more than Vo1, present embodiment is the example analysis with Vo9=Vo1=a.Value K2=K1/n, then Vo9=K1*Vs/n.
Comparing unit 9 is Vo1 and Vo9 relatively, when Vo1 Vo9, and promptly Vx Vs/n, promptly cell B1 voltage is less than the battery pack average voltage, comparator output high level, thus start balancedly, begin the cell makeup energy by the balance module 3 that B1 connected.
As Vo1 >=Vo9, promptly monomer battery voltage is not less than the battery pack average voltage, the comparator output low level, thus stop the cell makeup energy.
In addition, when Vo9 is set, but also value Vo9 is slightly larger than a, make monomer battery voltage be lower than battery pack mean value a certain amount of after, begin again cell is replenished.
Same, function that difference amplifier 2 ~ 8 and comparator 2 ~ 8 are realized and above-mentioned difference amplifier 1 are identical with the function that comparator 1 is realized.Judge method that whether monomer battery voltage need replenish and above-mentioned identical.
It should be noted that:
In the present embodiment; Be not limited to above-mentioned said battery pack average voltage with the preset value of monomer battery voltage comparison; To those skilled in the art; Can improve or conversion according to above-mentioned explanation, all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention.
In addition; The input of balance module 1 can be a part or all batteries voltage of series battery; Also can be outside power supply, the output service voltage of balance module 1 be lower than the cell of preset value, to those skilled in the art; Can improve or conversion according to above-mentioned explanation; Can adopt as long as be fit to the power supply of balance module 1 input, also can not influence the use of apparatus of the present invention, so all these improve and conversion all should belong to the protection range of accompanying claims of the present invention.
At last, apparatus of the present invention function height is integrated, can judge voluntarily whether monomer battery voltage is lower than preset value, and carries out energy supplement according to judged result to falling behind cell.Another characteristics of apparatus of the present invention function be the energy that replenishes can select from the battery pack of whole group; Consume the energy of whole Battery pack group on the one hand; On the other hand behindhand battery is replenished; The existing electric weight of balanced whole Battery pack group helps improving battery pack useful life and efficient rapidly.What device of the present invention adopted is the mode that energy shifts, and efficient is high, loss is little, in being specially adapted to, the battery pack that constitutes of jumbo battery.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as balance module 1, control module 2, PWM switching regulator DC-DC converter 3, measuring resistance 4, constant current control unit 5, driver element 6, isolated controlling unit 7, difference amplifier unit 8, comparing unit 9, transducer 10 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Energy transfer type battery pack balancing of the present invention is judged and compensation process, the steps include: step 5.1, is measured series battery total voltage and each monomer battery voltage of these unit, difference side of fortune 8 outputs by the difference amplifier unit in the control module 28; Step 5.2, calculate the average voltage of series-connected cell Battery pack according to series battery total voltage measured in the step 5.1 and each monomer battery voltage by the difference amplifier unit 8 in the control module 2; Step 5.3, by the comparing unit in the control module 29 size of monomer battery voltages and battery pack average voltage relatively, and,, promptly select execution in step 5.4 or step 5.5 to above-mentioned isolated controlling unit 7 transmission starting/stop signals according to its comparative result; After step 5.4, monomer battery voltage are lower than the battery pack average voltage, then start balance module 1, thereby the make-up monomers energy content of battery makes monomer battery voltage level off to the battery pack average voltage, and returns execution in step 5.3 through I/O; Step 5.5, monomer battery voltage are greater than or equal to the battery pack average voltage, then stop balance module 1 through I/O, no longer to the cell makeup energy and return execution in step 5.3.In the described step 5.4; The make-up monomers energy content of battery is promptly following to the concrete steps that cell charges: step 6.1, received the initiating signal that the comparing unit 9 in the control module 2 sends like the isolated controlling unit 7 in the balance module 1; Promptly select execution in step 6.2; As receive stop signal, promptly select execution in step 6.3; In step 6.2, the balance module 1: isolated controlling unit 7 is converted into the signal of telecommunication that balance module 1 is discerned with initiating signal, is input to constant current control unit 5, and constant current control unit 5 control PWM switching regulator DC-DC converters 3 charge; In step 6.3, the balance module 1: isolated controlling unit 7 is converted into balance module 1 other signal of telecommunication with stop signal, is input to constant current control unit 5, and constant current control unit 5 control PWM switching regulator DC-DC converters 3 stop charging.3 pairs of cell charging currents of described PWM switching regulator DC-DC converter size is 10%～50% of the specified charging current size of series battery.
Claim protection range of the present invention is not limited to the foregoing description.
Claims (5)
1. an energy transfer type battery pack balancing is judged and compensation process, it is characterized in that, its energy transfer type battery pack balancing is judged and supplementary device comprises:
The balance module (1) and the control module (2) that connect successively; Said balance module (1) is connected with each cell, utilizes the energy of series battery or the energy of external power source to charge for cell; Control module (2) is connected with series battery and each cell wherein, and measurement is also compared cell, judges whether this cell needs makeup energy and send starting/stop signal to said balance module (1);
Described balance module (1) comprising: be used for PWM switching regulator DC-DC converter (3) that cell is charged; Measuring resistance (4) or transducer (10); The output of said PWM switching regulator DC-DC converter is carried out the constant current control unit (5) of constant current control; Drive the driver element (6) of the switching device in the PWM switching regulator DC-DC converter; Receive the isolated controlling unit (7) of the starting/stop signal of above-mentioned control module (2) transmission;
Said PWM switching regulator DC-DC converter (3) and driver element (6), and measuring resistance (4) or transducer (10) be connected; Constant current control unit (5) and measuring resistance (4) or transducer (10), driver element (6), and isolated controlling unit (7) be connected;
Equilibrium judgement and the compensation process on said energy transfer type battery pack balancing judgement and supplementary device, used may further comprise the steps:
Step 5.1, measure series battery total voltage and each monomer battery voltage of the output of this difference amplifier unit (8) by the difference amplifier unit (8) in the control module (2);
Step 5.2, calculate the average voltage of series-connected cell Battery pack according to series battery total voltage measured in the step 5.1 and each monomer battery voltage by the difference amplifier unit (8) in the control module (2);
Step 5.3, by the size of monomer battery voltage and series battery average voltage relatively of the comparing unit (9) in the control module (2); And according to its comparative result; Send starting/stop signal to above-mentioned isolated controlling unit (7), promptly select execution in step 5.4 or step 5.5;
When step 5.4, monomer battery voltage are lower than the series battery average voltage, then start balance module (1), thereby the make-up monomers energy content of battery makes monomer battery voltage level off to the series battery average voltage, and returns execution in step 5.3 through I/O;
Step 5.5, monomer battery voltage are greater than or equal to the series battery average voltage, then stop balance module (1) through I/O, no longer to the cell makeup energy and return execution in step 5.3.
2. method according to claim 1 is characterized in that, in the described step 5.4, the make-up monomers energy content of battery is promptly following to the concrete steps that cell charges:
Step 6.1, received the initiating signal that the comparing unit (9) in the control module (2) sends, promptly selected execution in step 6.2, as receive stop signal, promptly selected execution in step 6.3 like the isolated controlling unit (7) in the balance module (1);
In step 6.2, the balance module (1): isolated controlling unit (7) are converted into initiating signal the signal of telecommunication of balance module (1) identification; Be input to constant current control unit (5), constant current control unit (5) control PWM switching regulator DC-DC converter (3) charges;
In step 6.3, the balance module (1): isolated controlling unit (7) are converted into stop signal the signal of telecommunication of balance module (1) identification; Be input to constant current control unit (5), constant current control unit (5) control PWM switching regulator DC-DC converter (3) stops charging.
3. method according to claim 1 is characterized in that, described PWM switching regulator DC-DC converter (3) is 10%～50% of the specified charging current size of series battery to cell charging current size.
4. method according to claim 1 is characterized in that, described control module (2) comprises successively and to connect:
Difference amplifier unit (8): be connected with above-mentioned series battery two ends and cell, be used to measure series battery and monomer battery voltage;
Comparing unit (9): constitute by comparator and amplifier or programmable logic controller (PLC) spare, and have I/O output.
5. method according to claim 1; It is characterized in that; Described PWM switching regulator DC-DC converter (3) adopts isolated form; Be flyback or normal shock type or semi-bridge type or bridge-type, described PWM switching regulator DC-DC converter (3) is input as the part or all of cell voltage or the external power source of series battery, is output as corresponding cell.
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| CN 201010510796 CN101976866B (en) | 2010-10-17 | 2010-10-17 | Balanced judgment and supplementary device of energy transfer type battery pack and method thereof |
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| CN102651563B (en) * | 2011-02-25 | 2014-06-18 | 香港理工大学 | Battery energy balancing circuit |
| CN102111005A (en) * | 2011-03-08 | 2011-06-29 | 上海大学 | Equalization management system and method for nondestructive lithium battery |
| CN102280912B (en) * | 2011-06-10 | 2015-02-25 | 深圳市金威源科技股份有限公司 | Equalization circuit of charge and discharge circuit of battery pack |
| CN102290839A (en) * | 2011-08-14 | 2011-12-21 | 山东理工大学 | Charge type electric quantity equalizing system for controlling voltage of power battery pack |
| CN102270871B (en) * | 2011-08-14 | 2013-06-12 | 山东理工大学 | Pneumatic-control charging-type electric quantity equalizing system for power battery pack |
| CN102364812B (en) * | 2011-10-28 | 2014-04-23 | 中国兵器工业集团第二一四研究所苏州研发中心 | Charging equalization circuit for power battery pack |
| CN103208827A (en) * | 2012-01-17 | 2013-07-17 | 中国科学院广州能源研究所 | Balance control system and method for high-capacity serial connected battery packs |
| CN103066667B (en) * | 2013-01-25 | 2016-02-24 | 天津新智电源有限公司 | Based on battery balancing system and the method for separated transformer |
| US9281696B2 (en) * | 2013-02-27 | 2016-03-08 | Fu-Sheng Tsai | Current steering circuit and current steering method for controlling branch current flowing through branch |
| CN103607004B (en) * | 2013-11-12 | 2016-08-17 | 珠海朗尔电气有限公司 | The two-way non-dissipative equalizing of accumulator battery and pulse activated system |
| CN103682482A (en) * | 2013-11-22 | 2014-03-26 | 超威电源有限公司 | Wireless intelligent battery |
| CN103956800B (en) * | 2014-05-22 | 2016-06-08 | 山东大学 | A kind of adaptive fuzzy balance control method using for reference history balancing speed |
| CN104051806B (en) * | 2014-06-09 | 2016-12-07 | 广东电网公司中山供电局 | Whole group storage battery and attending device thereof |
| CN104600799B (en) * | 2015-01-09 | 2017-12-19 | 深圳市理邦精密仪器股份有限公司 | A kind of series battery equalizing circuit and equalization methods |
| CN104901376A (en) * | 2015-06-10 | 2015-09-09 | 孙建平 | Electric quantity equalization method for high-voltage lithium ion battery pack |
| CN105591423A (en) * | 2015-09-17 | 2016-05-18 | 重庆雅讯电源技术有限公司 | General storage battery capacity equilibrium system and equilibrium control method thereof |
| KR102123048B1 (en) * | 2017-01-10 | 2020-06-15 | 주식회사 엘지화학 | Charge Control Apparatus capable of high speed cell balancing and energy saving and Method thereof |
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| JPH05184079A (en) * | 1991-12-26 | 1993-07-23 | Tamura Seisakusho Co Ltd | Charging current switching circuit for battery |
| KR101220339B1 (en) * | 2007-10-16 | 2013-01-09 | 한국과학기술원 | Automatic Charge Equalization Method and Apparatus for Series Connected Battery String |
| CN101262138A (en) * | 2007-12-05 | 2008-09-10 | 奇瑞汽车股份有限公司 | Monocase balanced system for lithium ion dynamic battery |
| CN101645610A (en) * | 2009-09-03 | 2010-02-10 | 深圳市晖谱能源科技有限公司 | Device for equalizing charge of battery and method thereof |
| CN201868903U (en) * | 2010-10-17 | 2011-06-15 | 中国船舶重工集团公司第七一二研究所 | Energy transferring balance judgment and supplementation device for battery pack |
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