CN102694398A - Current balance device of parallel battery and control method thereof - Google Patents

Current balance device of parallel battery and control method thereof Download PDF

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Publication number
CN102694398A
CN102694398A CN2011100733386A CN201110073338A CN102694398A CN 102694398 A CN102694398 A CN 102694398A CN 2011100733386 A CN2011100733386 A CN 2011100733386A CN 201110073338 A CN201110073338 A CN 201110073338A CN 102694398 A CN102694398 A CN 102694398A
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CN
China
Prior art keywords
battery
module
current
electric current
step
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CN2011100733386A
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Chinese (zh)
Inventor
刘玄达
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曜辉光电股份有限公司
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Priority to CN2011100733386A priority Critical patent/CN102694398A/en
Publication of CN102694398A publication Critical patent/CN102694398A/en

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Abstract

A current balance device of parallel batteries is electrically connected with a load. The current balance device comprises a depressurization module, a normal voltage module, a current comparison module and a control module. The depressurization module is electrically connected with a high voltage battery and outputs a first current to the load. The normal voltage module is electrically connected with a low-voltage battery and outputs a second current to the load. The current comparison module is electrically connected with the depressurization module and the normal voltage module, compares the first current with the second current and outputs a first comparison signal. The control module is electrically connected with the depressurization module and the current comparison module, outputs a control signal according to the first comparison signal to the depressurization module so as to adjust the first current. By using the device and the method of the invention, according to a characteristic difference of the each battery, the output current of the each battery can be balanced so that a service life of the battery can be prolonged.

Description

The current balancing device of batteries in parallel connection and control method thereof

Technical field

The present invention is about a kind of current balancing device and control method thereof of battery, especially in regard to a kind of current balancing device and control method thereof of batteries in parallel connection.

Background technology

For example using, the greatest problem that the vehicles or generator caused of the fossil fuel of gasoline or diesel oil etc. promptly is to produce air pollution; Thereby along with the lifting of environmental consciousness; With the power resources of the lower battery of contaminative, be the technology that present industry does one's utmost to develop as the vehicles or generator.Because the vehicles and other large-scale computer tool need bigger voltage and electric current on driving and operating; Thereby if with battery during as power-supply unit; Then need and/or be connected in series, to increase the output voltage and/or the electric current of power-supply unit a plurality of battery parallel connections.

Please with reference to shown in Figure 1, the power-supply unit 1 of known batteries parallel connection comprises one first battery 11 and one second battery 12, to provide an electric current to load L respectively.Though the power-supply unit of known battery parallel connection has the simple advantage of circuit framework, two batteries offer the electric current of load end respectively will the change to some extent along with the difference of the continuous electric weight of battery itself and internal resistance.Therefore,, possibly make that the output current of a certain battery is excessive, and quicken the aging and damage of battery along with the variation of battery behavior.

If battery is when being made up of a plurality of battery units that are connected in series each other, the series connected battery unit is many more, and the property difference between each battery also will be obvious more, and each battery is to electric current that load provided also inequality more.In addition; When but the battery that is adopted is the secondary cell of recharge use, because promptly there is the difference on the characteristic in each battery itself, thereby when parallel connection is used; The higher battery of voltage will charge to the lower battery of voltage, and causes extra power loss.

Therefore, how a kind of current balancing device and control method thereof of batteries in parallel connection is provided, makes it can be,, and prolong useful life of battery, become one of important topic with the output current of each battery of balance in response to the property difference of each battery itself.

Summary of the invention

The purpose of this invention is to provide a kind of can be in response to the property difference of each battery the current balancing device and the control method thereof of the batteries in parallel connection of the output current of each battery of balance.

The present invention can adopt following technical scheme to realize.

A current balancing device and a load according to a kind of batteries in parallel connection of the present invention electrically connect.Current balancing device comprises a step-down module, a normal pressure module, a current comparing module and a control module.A step-down module and a high-voltage battery electrically connect and export one first electric current to load.A normal pressure module and a low-voltage battery electrically connect and export one second electric current to load.Current comparing module and step-down module and normal pressure module electrically connect, and relatively first electric current and second electric current and export one first comparison signal.Control module and step-down module and current comparing module electrically connect, and control signal to the step-down module according to said first comparison signal output one and regulate first electric current.

In one embodiment of the invention, high-voltage battery and low-voltage battery are secondary cells.

In one embodiment of the invention, high-voltage battery and low-voltage battery are to be connected in parallel.

In one embodiment of the invention, control signal control step-down module is transferred and is increased first electric current to a desired value.

In addition, according to the control method of a kind of current balancing device of the present invention, it is used for the output current of balance at least two batteries, and control method comprises the following steps: to judge that what person of said battery has higher output voltage; The battery that will have than high output voltage is electrically connected to a reduction voltage circuit; The battery that will have than low output voltage is electrically connected to a normal pressure circuit; Export one first electric current and one second electric current to a load from reduction voltage circuit and normal pressure circuit respectively; And relatively first electric current and second electric current and then adjust first electric current.

In one embodiment of the invention, battery is a secondary cell.

In one embodiment of the invention, control method also comprises detecting first electric current and second electric current and exports one first detection signal and one second detection signal; Compare first detection signal and second detection signal and export one first comparison signal; And export a control signal and then adjust first electric current according to first comparison signal and one second comparison signal.

Hold the above; Because of current balancing device and control method thereof according to a kind of batteries in parallel connection of the present invention are passed through reduction voltage circuit and high-voltage battery are electrically connected; And see through current comparing module and control module and produce one and control signal to reduction voltage circuit, to regulate first electric current that high-voltage battery is exported.Thereby realize and, to prolong with the output current of each battery of balance in response to the property difference of each battery itself in order to do being able to the useful life that makes battery.

Description of drawings

Fig. 1 is a kind of sketch map of power-supply unit of known battery parallel connection;

Fig. 2 is the sketch map according to the current balancing device of a kind of batteries in parallel connection of the preferred embodiment of the present invention;

Fig. 3 is the sketch map according to the current balancing device of a kind of batteries in parallel connection of the preferred embodiment of the present invention;

Fig. 4 A and Fig. 4 B are the flow charts according to the control method of a kind of current balancing device of the preferred embodiment of the present invention; And

Fig. 5 is according to first electric current of the preferred embodiment of the present invention and the sketch map of second electric current.

The main element symbol description:

1: power-supply unit

11, B 1: first battery

12, B 2: second battery

2: current balancing device

21: the step-down module

211: switch module

212: diode

213: inductor

214: the first detection element

22: the normal pressure module

221: the second detection element

23: current comparing module

231: the first comparing units

232: the second comparing units

233: the electric current comparing unit

24: control module

241: timing unit

242: trigger

25: the input handover module

251: the first switch elements

252: the second switch unit

253: the three switch elements

254: the four switch elements

C: capacitor

CMP1, CMP2: comparator

CS: constant current source

I 1: first electric current

I 2: second electric current

INV: inverter

L: load

S01~S05, S11~S13: the step of control method

S 1: first comparison signal

S 2: second comparison signal

S C: control signal

S D1: first detection signal

S D2: second detection signal

V REF: reference power source

Embodiment

Below will current balancing device and control method thereof according to a kind of batteries in parallel connection of the preferred embodiment of the present invention be described with reference to correlative type, wherein components identical will be explained with the components identical symbol.

See also shown in Figure 2ly, it is the sketch map of current balancing device of a kind of batteries in parallel connection of the preferred embodiment of the present invention.Current balancing device 2 and a load L electrically connect, and receive the electric power that a high-voltage battery and a low-voltage battery are provided, and provide an electric current to load L.

On the implementation, high-voltage battery is parallel with one another the connection with low-voltage battery, and high-voltage battery and low-voltage battery can be primary cell (primary battery), secondary cell (secondary battery) or solar cell (solar cell).In addition, high-voltage battery described herein and low-voltage battery be identical material and or the battery of same size, only the property difference because of battery itself has the different voltages with different value.

Current balancing device 2 comprises a step-down module 21, a normal pressure module 22, a current comparing module 23, a control module 24 and an input handover module 25.Wherein, step-down module 21 electrically connects with high-voltage battery, and exports one first electric current I 1To load L.In addition, normal pressure module 22 electrically connects with low-voltage battery, and exports one second electric current I 2To load L.

Current comparing module 23 electrically connects with step-down module 21 and normal pressure module 22, and compares first electric current I 1With second electric current I 2And export one first comparison signal S 1

Control module 24 electrically connects with step-down module 21 and current comparing module 23, and according to the first comparison signal S 1Export a control signal S CTo step-down module 21, and then regulate first electric current I that step-down module 21 is exported 1

At this, what need pay special attention to is, present embodiment is that to electrically connect with a high-voltage battery and a low-voltage battery respectively with the step-down module 21 of current balancing device 2 and normal pressure module 22 be example.Yet, on practice, can be according to the demand of reality, with a plurality of step-down modules and or the battery of other quantity of a plurality of normal pressure module collocation operate.

Input handover module 25 and one first battery B 1And one second battery B 2Connect; And therefrom select the battery that has than high output voltage as high-voltage battery; And high-voltage battery and step-down module 21 electrically connected, and select the battery that has than low output voltage as low-voltage battery, and with low-voltage battery and 22 electric connections of normal pressure module.

Then, please with reference to shown in Figure 3, to further specify current balancing device of the present invention.The step-down module 21 of current balancing device 2 comprises a switch module 211, a diode 212, an inductor 213 and one first detection element 214.In the present embodiment, switch module 211 electrically connects with high-voltage battery, and the control signal S that is exported according to control module 24 CSwitch and become conducting state or cut-off state.The negative electrode of diode 212 and switch module 211 electrically connect, and the anode of diode 212 is connected with an earth terminal.Inductor 213 electrically connects and produces first electric current I with the negative electrode of switch module 211 and diode 212 1The two ends of first detection element 214 electrically connect with inductor 213 and load L respectively, and export first electric current I 1To load L.

In operation, when switch module 211 is conducting state, first electric current I 1To export load L to via switch module 211, inductor 213 and first detection element 214, and first electric current I 1Current value will continue to increase to a desired value.When switch module 211 is cut-off state, first electric current I 1To export load L to via diode 212, inductor 213 and first detection element 214, and first electric current I 1Current value will continue to successively decrease.

Normal pressure module 22 has one second detection element 221.Wherein, an end of second detection element 221 and low-voltage battery electrically connect, and the other end then electrically connects with first detection element 214 and load L respectively, and exports second electric current I 2To load L.

On the implementation; Switch module 211 is a two-carrier transistor (BJT), a field-effect transistor (FET) or igbt (IGBT); But diode 212 1 Schottky diodes (Schottky diode), and first detection element 214 and second detection element 221 are the identical resistors of resistance value.

Current comparing module 23 comprises one first comparing unit 231, one second comparing unit 232 and an electric current comparing unit 233.Wherein, two inputs of first comparing unit 231 electrically connect with the two ends of first detection element 214 respectively, and export one first detection signal S D1Two inputs of second comparing unit 232 electrically connect with the two ends of second detection element 221 respectively, and export one second detection signal S D2The output of the electric current comparing unit 233 and first comparing unit 231 and second comparing unit 232 electrically connects, and according to the first detection signal S D1And the second detection signal S D2Export the first comparison signal S 1

On the implementation, current balancing device 2 measures the potential difference that first detection element 214 and second detection element 221 are produced respectively through first comparing unit 231 and second comparing unit 232, and the computing that sees through electric current comparing unit 233 again is to judge first electric current I 1And second electric current I 2Current value whether equate.

In addition; In the present embodiment; Two inputs of first comparing unit 231 and the junction of first detection element 214 are provided with a bleeder circuit respectively, and the junction of two inputs of second comparing unit 232 and second detection element 221 also is provided with a bleeder circuit respectively.Wherein, the resistance value of the resistance of each bleeder circuit, the application of visual reality is required and different designs is arranged.For example be to select for use all identical resistance of resistance value to form bleeder circuit.In addition, the resistance that constitutes bleeder circuit can also adopt variable resistor or digital regulation resistance (digital potentiometer), adjusts to bleeder circuit in order to designer or user.

Control module 24 comprises a timing unit 241 and a trigger 242.In the present embodiment, timing unit 241 has a capacitor C, a comparator C MP1 and a constant current source CS.Wherein, capacitor C and constant current source CS electrically connect, and charge through constant current source CS.Two inputs of comparator C MP1 respectively with a capacitor C and a reference power source V REFElectrically connect, charge when capacitor C sees through constant current source CS, and make the current potential of capacitor C arrive reference power source V REFCurrent potential after, comparator C MP1 will export one second comparison signal S 2Trigger 242 electrically connects with the comparator C MP1 of timing unit 241 and the electric current comparing unit 233 of current comparison circuit 23, and according to the first comparison signal S 1And the second comparison signal S 2Output control signal S C

On the implementation, timing unit 241 is in order to periodically to see the second comparison signal S off 2, and then the switch module 211 of notification triggers device 24 conducting step-down modules 21.

In addition, in the present embodiment, timing unit 241 also has a transistor switch, and itself and capacitor C electrically connect, and so that capacitor C to be provided a discharge path, and transistor switch electrically connects with trigger 242, and fails S according to second comparison signal 2Switch.On the implementation, but trigger 242 1 rest-set flip-flops, and its setting (reset) of resetting is held and setting (set) end receives the first comparison signal S respectively 1And the second comparison signal S 2, output and reversed-phase output then electrically connect with the switch module 211 of step-down module 21 and the transistor switch of timing unit 241 respectively.

Input handover module 25 comprises a comparator C MP2, an inverter INV, one first switch element 251, a second switch unit 252, one the 3rd switch element 253 and one the 4th switch element 254.

Two inputs of comparator C MP2 respectively with the first battery B 1And the second battery B 2Electrically connect, and compare the first battery B 1And the second battery B 2Magnitude of voltage.Inverter INV has an input and an output, and the output of the input of inverter INV and comparator C MP2 electrically connects.

First switch element 251 electrically connects with the input of inverter INV and the output of comparator C MP2, and the signal of being exported according to comparator C MP2 switches.Second switch unit 252 electrically connects with the output of inverter INV, and the signal of being exported according to inverter INV switches.The 3rd switch element 253 electrically connects with the input of inverter INV and the output of comparator C MP2, and the signal of being exported according to comparator C MP2 switches.The 4th switch element 254 electrically connects with the output of inverter INV, and the signal of being exported according to inverter INV switches.

As the first battery B 1Output voltage greater than the second battery B 2Output voltage the time, comparator C MP2 will export the signal of a high levels, and make win switch element 251 and the 3rd switch element 253 become conducting state, to determine the first battery B 1Electrically connect with step-down module 21 as high-voltage battery, and the second battery B 2Electrically connect with normal pressure module 22 as low-voltage battery.At the same time, because inverter INV exports the signal of a low level, thereby make second switch unit 252 and the 4th switch element 254 become cut-off state.

In addition, when the output voltage of the second battery B2 greater than the first battery B 1Output voltage the time, comparator C MP2 then exports the signal of a low level, and makes win switch element 251 and the 3rd switch element 253 become cut-off state.At the same time, inverter INV exports the signal of a high levels, thereby makes second switch unit 252 and the 4th switch element 254 become conducting state, to determine the second battery B 2Electrically connect with step-down module 21 as high-voltage battery, and the second battery B 1Electrically connect with normal pressure module 22 as low-voltage battery.

Then, below please with reference to the flow chart of Fig. 4 A and arrange in pairs or groups shown in Figure 3ly, with the control method of the current balancing device of explanation the preferred embodiments of the present invention, it uses with for example above-mentioned current balancing device 2 collocation.The step of the control method of current balancing device comprises S01~S05.

Step S01 judges the first battery B 1And the second battery B 2What person has higher output voltage.In the present embodiment, the comparator C MP2 through input handover module 25 receives and the comparison first battery B 1And the second battery B 2The voltage of being exported.

The battery that step S02 will have than high output voltage is electrically connected to a step-down module 21.In the present embodiment, with the first battery B 1Output voltage be higher than the second battery B 2Be the example explanation, comparator C MP2 will export a high levels signal with conducting first switch element 251 this moment, and make the battery B that wins 1Electrically connect as high-voltage battery and with step-down module 21.In addition, owing to behind the high levels signal that comparator C MP2 the is exported process inverter INV, will be converted into a low level signal, thereby second switch unit 252 is in cut-off state.

The battery that step S03 will have than low output voltage is electrically connected to a normal pressure module 22.Because the first battery B 1Output voltage be higher than the second battery B 2, so high levels signal conduction the 3rd switch element 253 of being exported of comparator C MP2, and make the second battery B 2Electrically connect as low-voltage battery and with normal pressure module 22.At the same time, the 4th switch element 254 is in cut-off state.

Step S04 is respectively from step-down module 21 and normal pressure module 22 outputs one first electric current I 1And one second electric current I 2To a load L.On the implementation, after high-voltage battery and low-voltage battery electrically connect with step-down module 21 and normal pressure module 22 respectively, will export one first electric current I respectively 1And one second electric current I 2To load L.

Step S05 is first electric current I relatively 1And second electric current I 2And then adjust first electric current I 1In the present embodiment, compare first electric current I through current comparing module 23 1And second electric current I 2, and see through control module 24 outputs one control signal S CSwitch the switch module 211 of step-down module 21, and then adjust first electric current I 1Current value.

Please with reference to the flow chart of Fig. 4 B and arrange in pairs or groups shown in Figure 3, in the present embodiment, detailed again it, step S05 can also comprise step S11~S13.Wherein, step S11 detects first electric current I 1And second electric current I 2And export one first detection signal S D1And one second detection signal S D2On the implementation, the potential difference that first detection element 214 that first comparing unit 231 of current comparing module 23 and second comparing unit 232 measure step-down module 21 respectively and second detection element 221 of normal pressure module 22 are produced, and export the first detection signal S respectively D1And the second detection signal S D2To electric current comparing unit 233.

Step S12 is the first detection signal S relatively D1And the second detection signal S D2And export one first comparison signal S 1In the present embodiment, 233 receptions of electric current comparing unit are also compared the first detection signal S D1And the second detection signal S D2When first electric current I 1Less than second electric current I 2The time, the second detection signal S D2Less than the first detection signal S D1, the first comparison signal S of electric current comparing unit 233 outputs one low level 1When first electric current I 1Equal second electric current I 2The time, the first detection signal S D1Less than the second detection signal S D2, the first comparison signal S of electric current comparing unit 233 outputs one high levels 1

Step S13 is according to the first comparison signal S 1And one second comparison signal S 2Export a control signal S CAnd then adjust first electric current I 1In the present embodiment, the constant current source CS of timing unit 241 charges to capacitor C, as a current potential and the reference power source V of capacitor C REFAfter identical, comparator C MP1 will export the second comparison signal S of a high levels 2To trigger 242, and the switch module 211 of step-down module 21 will be switched on.That is, first electric current I 1To export load L to via switch module 211, inductor 213 and first detection element 214, and first electric current I 1Current value will continue to increase up to desired value first electric current I for example 1Current value equal second electric current I 2Current value.

When first electric current I 1Current value increase after desired value the first comparison signal S that the trigger 242 of control module 24 will be exported according to current comparing module 23 1Switch module 211 by step-down module 21.At this moment, first electric current I 1To export load L to via diode 212, inductor 213 and first detection element 214.Then, behind a Preset Time, when constant current source CS charges to and reference power source V capacitor C REFAfter having identical current potential, switch module 211 will be switched on once more.Wherein, this Preset Time is C*V/I, and C described herein, V and I are respectively capacitance, the reference power source V of capacitor C REFCurrent potential and the current value of constant current source CS.

In addition, what deserves to be mentioned is that current balancing device can also comprise a microprocessor on practice, to use with the digital regulation resistance collocation of forming bleeder circuit.Wherein, Designer or user can set one group or the trigger value and the adjusted value of many groups in microprocessor; So that microprocessor can be according to predefined trigger value and adjusted value adjustment digital regulation resistance, so change first electric current the desired value that will reach.In other words, current balancing device can be adjusted desired value automatically according to the battery capacity of first battery and second battery and reach current balance type.Certainly, the mode that designer and user can also be manual is carried out the adjustment of desired value.

Please with reference to Fig. 5, it is according to current balancing device of the preferred embodiments of the present invention and control method, first electric current I that step-down module 21 and normal pressure module 22 are exported 1And second electric current I 2Sketch map.

In the present embodiment, when switch module 211 conductings, first electric current I 1Continue to increase, and when switch module 211 ends, first electric current I 1Then reduce gradually.In addition, second electric current I 2Will be according to first electric current I 1Change and change, so that load L to be provided required operating current.

Through above-mentioned hardware configuration and control method, see through current comparing module 23 and control module 24 and make switch element 211 by periodic conducting and end, first electric current I that makes that step-down module 21 is exported 1Can in an opereating specification, produce change, and then avoid having high-tension battery and continue the electric current that provides bigger, and cause the accelerated ageing and the damage of battery.

In above embodiment, the current balancing device of batteries in parallel connection and control method thereof are applicable to the secondary cell of high power output, for example: electric motor car, oily electric hybrid vehicle, stand-by generator, etc. the required battery of motor application such as medium-and-large-sized facility.

In addition, what deserves to be mentioned is, as the first battery B 1And the second battery B 2When being solar cell, owing to shelter from solar cell if the cast shadow of trees, chimney or other object takes place, with making the problem that produces mismatch between the solar cell.That is the solar cell that parallel connection is used will cause the unbalance of power output because of covering of external object, and cause solar cell because overheated and damage.Therefore, as the first battery B 1And the second battery B 2When being solar cell, current balancing device 2 is the balance first battery B effectively not only 1And the second battery B 2Output current, also have the effect that reduces backward current, and then protect the first battery B1 and the second battery B2, can avoid the generation of stress centrostigma (hot spot) and cause damage.

In sum; Because of current balancing device and control method thereof according to a kind of batteries in parallel connection of the present invention are passed through reduction voltage circuit and high-voltage battery are electrically connected; And see through current comparing module and control module and produce one and control signal to reduction voltage circuit, to regulate first electric current that high-voltage battery is exported.Can be thereby realize in response to the property difference of each battery itself, with the output current of each battery of balance, and the useful life of prolongation battery.

The above only is an illustrative, and non-limiting.Anyly do not break away from spirit of the present invention and category, and, all should be included in the claim institute restricted portion its equivalent modifications of carrying out or change.

Claims (10)

1. the current balancing device of a batteries in parallel connection electrically connects with a load, it is characterized in that, comprising:
One step-down module electrically connects and exports one first electric current to said load with a high-voltage battery;
One normal pressure module electrically connects and exports one second electric current to said load with a low-voltage battery;
One current comparing module, itself and said step-down module and said normal pressure module electrically connect, and more said first electric current and said second electric current and export one first comparison signal; And
One control module, itself and said step-down module and said current comparing module electrically connect, and control signal to said step-down module according to said first comparison signal output one and regulate said first electric current.
2. current balancing device according to claim 1 is characterized in that, said step-down module comprises:
One switch module electrically connects with said high-voltage battery and the conducting or end according to said control signal;
One diode electrically connects with said switch module; And
One inductor electrically is connected with said switch module and said diode and exports said first electric current.
3. current balancing device according to claim 1 is characterized in that, said high-voltage battery and said low-voltage battery are secondary cells.
4. current balancing device according to claim 1; It is characterized in that; Said step-down module comprises one first detection element; Said normal pressure module comprises one second detection element, and said first electric current and said second electric current export said load to via said first detection element and said second detection element respectively, and said current comparing module comprises:
One first comparing unit is exported one first detection signal with the two ends electric connection of said first detection element;
One second comparing unit is exported one second detection signal with the two ends electric connection of said second detection element; And
One electric current comparing unit electrically connects with said first comparing unit and said second comparing unit, and exports said first comparison signal to said control circuit according to said first detection signal and said second detection signal.
5. current balancing device according to claim 1 is characterized in that, said control signal is controlled said step-down module and transferred and increase said first electric current to a desired value.
6. current balancing device according to claim 1 is characterized in that, said control module comprises:
One timing unit has a capacitor, a comparator and a constant current source, and said capacitor and said constant current source electrically connect, and said comparator and said capacitor and a reference power source electrically connect also exports one second comparison signal; And
One trigger electrically connects with said timing unit and said current comparison circuit, and exports said control signal according to said first comparison signal and said second comparison signal.
7. current balancing device according to claim 1 is characterized in that, also comprises:
One input handover module, it selects the battery that has than high output voltage among one first battery and one second battery as said high-voltage battery, and selects the battery that has than low output voltage as said low-voltage battery.
8. current balancing device according to claim 7 is characterized in that, said input handover module comprises:
One comparator, it has two inputs, electrically connects with said first battery and said second battery respectively;
One inverter, it has an input, with the output electric connection of said comparator;
Whether one first switch element with the input electric connection of said inverter, is controlled said first battery and is electrically connected with said step-down module as said high-voltage battery;
Whether one second switch unit with the output electric connection of said inverter, is controlled said second battery and is electrically connected with said step-down module as said high-voltage battery;
Whether one the 3rd switch element with the input electric connection of said inverter, is controlled said first battery and is electrically connected with said normal pressure module as said low-voltage battery; And
Whether one the 4th switch element with the output electric connection of said inverter, is controlled said second battery and is electrically connected with said normal pressure module as said low-voltage battery.
9. the control method of a current balancing device is used for the output current of at least two batteries of balance, it is characterized in that, comprising:
Judge that what person of said battery has higher output voltage;
The battery that will have than high output voltage is electrically connected to a step-down module;
The battery that will have than low output voltage is electrically connected to a normal pressure module;
Export one first electric current and one second electric current to a load from said step-down module and said normal pressure module respectively; And
More said first electric current and said second electric current and then adjust said first electric current.
10. control method according to claim 9 is characterized in that, said comparison step comprises:
Detect said first electric current and said second electric current and export one first detection signal and one second detection signal;
More said first detection signal and said second detection signal and export one first comparison signal; And
Export a control signal and then adjust said first electric current according to said first comparison signal and one second comparison signal.
CN2011100733386A 2011-03-25 2011-03-25 Current balance device of parallel battery and control method thereof CN102694398A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103887844A (en) * 2012-12-20 2014-06-25 诺基亚公司 Balancing of battery cells connected in parallel
CN106169619A (en) * 2015-05-18 2016-11-30 福特全球技术公司 Current balancing device for the batteries in parallel connection unit of electric vehicle
CN106183704A (en) * 2015-05-28 2016-12-07 通用汽车环球科技运作有限责任公司 Location-based remote control starts

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103887844A (en) * 2012-12-20 2014-06-25 诺基亚公司 Balancing of battery cells connected in parallel
CN103887844B (en) * 2012-12-20 2016-05-18 诺基亚技术有限公司 The balance of the battery unit being connected in parallel
CN106169619A (en) * 2015-05-18 2016-11-30 福特全球技术公司 Current balancing device for the batteries in parallel connection unit of electric vehicle
CN106183704A (en) * 2015-05-28 2016-12-07 通用汽车环球科技运作有限责任公司 Location-based remote control starts
CN106183704B (en) * 2015-05-28 2018-12-14 通用汽车环球科技运作有限责任公司 For controlling the method and system of vehicle cab mesoclimate feature

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