CN201298737Y - Battery equalizing device - Google Patents

Battery equalizing device Download PDF

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Publication number
CN201298737Y
CN201298737Y CNU2008202009335U CN200820200933U CN201298737Y CN 201298737 Y CN201298737 Y CN 201298737Y CN U2008202009335 U CNU2008202009335 U CN U2008202009335U CN 200820200933 U CN200820200933 U CN 200820200933U CN 201298737 Y CN201298737 Y CN 201298737Y
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China
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channel field
battery
switch element
effect pipe
pipe
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Expired - Lifetime
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CNU2008202009335U
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Chinese (zh)
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何远强
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Individual
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Priority to CNU2008202009335U priority Critical patent/CN201298737Y/en
Priority to PCT/CN2009/072567 priority patent/WO2010034210A1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0016Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M16/00Structural combinations of different types of electrochemical generators
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The utility model relates to the technical field of equalizing devices, more particularly to a battery equalizing device comprising a plurality of batteries which are connected in series, an electrical quantity equalizing circuit which can transmit the electrical energy of the battery with higher voltage into the battery with lower voltage and equalize the electrical quantities of the two batteries and is connected between the two batteries, and the input end of the electrical quantity equalizing circuit is connected with a control and drive circuit used for controlling and driving the electrical quantity equalizing circuit; and in the state that the battery is charged, and discharged or stands by, the electrical quantity equalizing circuit can all transmit the electrical quantity of the battery with higher voltage into the battery with lower voltage so that the electrical quantities of the two batteries are equalized; thus, the utility model can equalize the electrical quantities of all batteries in real time, thereby improving the equalizing effect and the equalizing effect of the electrical quantities among all batteries.

Description

A kind of battery balanced device
Technical field:
The utility model relates to the balancer technical field, relates in particular to a kind of battery balanced device.
Background technology:
Battery is used so that higher output voltage and bigger power capacity to be provided by series, parallel usually, satisfies the demand of load driving.On the other hand,, be widely used in each electronic product because rechargeable battery has cost performance preferably, even in the motor vehicle.Yet, because the restriction of process conditions tends to exist certain difference between the cell, through after the charge and discharge cycles repeatedly, can produce bigger voltage difference between the battery, the total available capacity of series battery is diminished, influence battery pack serviceability and life-span.
At present; the problem of bringing owing to the disequilibrium between cell when connecting use for solving battery; use integrated chip or single-chip microcomputer to monitor battery status mostly with equalizing charge function; when reaching, the voltage that detects certain battery overcharges or overdischarge when pressing; control this battery and stop charge or discharge; other battery continues charge or discharge, puts protection until reaching over-charge protective or crossing, to realize battery balanced state.But, above-mentioned solution can only reach at detected battery and overcharge or overdischarge could balancing battery when pressing, and can not in charge and discharge process, adjust each cell voltage in real time according to the variation of cell voltage, make that each battery is in a kind of poised state all the time in the whole charging and discharging process, so portfolio effect is relatively poor, poor reliability; And, use integrated chip or the battery balanced function of chip microcontroller, its complex circuit, production cost is higher.
The utility model content:
The purpose of this utility model is exactly to provide a kind of battery balanced device of balanced each battery electric quantity in real time at the deficiency of prior art existence.
To achieve these goals, the technical solution adopted in the utility model is:
It comprises a plurality of batteries that are in series, the power delivery that is connected with battery that can voltage is higher between two batteries to the lower battery of voltage, make the electric weight of two batteries obtain balanced electric weight equalizing circuit, the input of described electric weight equalizing circuit is connected with the control Driver Circuit that is used for controlling and driving electric weight equalizing circuit.
Wherein, described electric weight equalizing circuit comprises first switch element, second switch unit, the 3rd switch element, the 4th switch element and charge/discharge unit; Anodal two-way connection of described first switch element and battery B, first switch element is connected with charge/discharge unit is two-way, and charge/discharge unit is connected with the second switch unit is two-way, and the second switch unit is connected with the negative pole of battery B is two-way; Anodal two-way connection of described the 3rd switch element and battery A, the 3rd switch element is connected with charge/discharge unit is two-way, and charge/discharge unit is connected with the 4th switch element is two-way, and the 4th switch element is connected with the negative pole of battery A is two-way; The input of described first switch element, second switch unit, the 3rd switch element, the 4th switch element all is connected with control Driver Circuit.
Wherein, described first switch element be by N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube (Insulated Gate Bipolar Transistor, IGBT), a kind of in the relay or its constitute; Described second switch unit is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described the 3rd switch element is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described the 4th switch element is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its.
Wherein, described charge/discharge unit is to be made of the electrochemical capacitor that can discharge and recharge, tantalum electric capacity, farad capacitor, polarity free capacitor or battery.
Wherein, described first switch element is P-channel field-effect transistor (PEFT) pipe QA1, and the second switch unit is N channel field-effect pipe QB1, and the 3rd switch element is N channel field-effect pipe QC1, and the 4th switch element is N channel field-effect pipe QD1, and charge/discharge unit is a capacitor C 1; The source electrode of described QA1 is connected with the positive pole of battery B, and the drain electrode of QA1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the source electrode of QB1, and the drain electrode of QB1 is connected with the negative pole of battery B; The source electrode of described QC1 is connected with the positive pole of battery A, and the drain electrode of QC1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the drain electrode of QD1, and the source electrode of QD1 is connected with the negative pole of battery A; The grid of described QA1, QB1, QC1, QD1 all is connected with control Driver Circuit.
Wherein, described first switch element, second switch unit, the 3rd switch element, the 4th switch element are respectively N channel field-effect pipe QA1, QB1, QC1, QD1, and charge/discharge unit is a capacitor C 1; The drain electrode of described QA1 is connected with the positive pole of battery B, and the source electrode of QA1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the source electrode of QB1, and the drain electrode of QB1 is connected with the negative pole of battery B; The source electrode of described QC1 is connected with the positive pole of battery A, and the drain electrode of QC1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the drain electrode of QD1, and the source electrode of QD1 is connected with the negative pole of battery A; The grid of described QA1, QB1, QC1, QD1 all is connected with control Driver Circuit.
The utility model beneficial effect is:
A kind of battery balanced device that the utility model provides comprises a plurality of batteries that are in series, be connected with the power delivery of battery that can voltage is higher to the lower battery of voltage between two batteries, make the electric weight of two batteries obtain balanced electric weight equalizing circuit, the input of described electric weight equalizing circuit is connected with the control Driver Circuit that is used for controlling and driving electric weight equalizing circuit, charging at battery, under discharge or the static condition, the electric weight of the battery that the electric weight equalizing circuit all can be higher with voltage is delivered in the lower battery of voltage, make the electric weight equilibrium of two batteries.Therefore, the utility model is the electric weight of balanced each battery in real time, thereby improves the portfolio effect and the reliability of electric weight between each battery.
Description of drawings:
Fig. 1 is a block diagram of the present utility model;
Fig. 2 is the another kind of block diagram of the utility model;
Fig. 3 is the block diagram that the utility model comprises electric weight equalizing circuit internal structure;
Fig. 4 is the circuit theory diagrams of the utility model embodiment one;
Fig. 5 is the drive waveforms schematic diagram of the control Driver Circuit output of the utility model embodiment one;
Fig. 6 is the circuit theory diagrams of the utility model embodiment two;
Fig. 7 is the drive waveforms schematic diagram of the control Driver Circuit output of the utility model embodiment two;
Fig. 8 is an application examples 1 of the present utility model;
Fig. 9 is an application examples 2 of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing the utility model is further described, embodiment sees shown in Fig. 1~5, it comprises a plurality of batteries that are in series 11, the power delivery that two 11 on batteries are connected with battery 11 that can voltage is higher to the lower battery 11 of voltage, make the electric weight of two batteries 11 obtain balanced electric weight equalizing circuit 12, the input of described electric weight equalizing circuit 12 is connected with the control Driver Circuit 13 that is used for controlling and driving electric weight equalizing circuit 12.Under charging, discharge or the static condition of battery 11, the electric weight of the battery 11 that electric weight equalizing circuit 12 all can be higher with voltage is delivered to the lower battery of voltage 11, make the electric weight equilibrium of two batteries 11.Therefore, the utility model is the electric weight of balanced each battery 11 in real time, thereby improves the portfolio effect and the reliability of 11 electric weight of each battery.Certainly, if connect electric weight equalizing circuit 12 on 11 on two adjacent batteries, because the current potential of two battery 11 junctions is identical, its structure as shown in Figure 2.
The electric weight equalizing circuit of present embodiment comprises first switch element 121, second switch unit 122, the 3rd switch element 123, the 4th switch element 124 and charge/discharge unit 125; Anodal two-way connection of described first switch element 121 and battery B, first switch element 121 and 125 two-way connections of charge/discharge unit, charge/ discharge unit 125 and 122 two-way connections of second switch unit, second switch unit 122 is connected with the negative pole of battery B is two-way; Anodal two-way connection of described the 3rd switch element 123 and battery A, the 3rd switch element 123 and 125 two-way connections of charge/discharge unit, charge/ discharge unit 125 and 124 two-way connections of the 4th switch element, the 4th switch element 124 is connected with the negative pole of battery A is two-way; The input of described first switch element 121, second switch unit 122, the 3rd switch element 123, the 4th switch element 124 all is connected with control Driver Circuit.Wherein, described first switch element 121 is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described second switch unit 122 is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described the 3rd switch element 123 is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described the 4th switch element 124 is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Certainly, the combination of different components and parts, its combination polarity and drive waveforms separately are different; Described charge/discharge unit 125 is to be made of the electrochemical capacitor that can discharge and recharge, tantalum electric capacity, farad capacitor, polarity free capacitor or battery.
First switch element 121 of present embodiment is P-channel field-effect transistor (PEFT) pipe QA1, second switch unit 122 is N channel field-effect pipe QB1, the 3rd switch element 123 is N channel field-effect pipe QC1, and the 4th switch element 124 is N channel field-effect pipe QD1, and charge/discharge unit 125 is a capacitor C 1; The source electrode of described QA1 is connected with the positive pole of battery B, and the drain electrode of QA1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the source electrode of QB1, and the drain electrode of QB1 is connected with the negative pole of battery B; The source electrode of described QC1 is connected with the positive pole of battery A, and the drain electrode of QC1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the drain electrode of QD1, and the source electrode of QD1 is connected with the negative pole of battery A; The grid of described QA1, QB1, QC1, QD1 all is connected with control Driver Circuit.
The operation principle of present embodiment:
Under the driving of control Driver Circuit 13, t0 is a clock cycle to t4, when time t0 arrives t1, QA1 and QB1 conducting simultaneously, QC1 and QD1 turn-off simultaneously, at this moment, if the voltage height of the voltage ratio capacitor C 1 of battery B, then battery B gives capacitor C 1 charging through QA1 and QB1, if the voltage height of the voltage ratio battery B of capacitor C 1, then capacitor C 1 is given battery B discharge through QA1 and QB1; At time t2 during to t3, QA1 and QB1 shutoff simultaneously, QC1 and QD1 conducting simultaneously, at this moment, if the voltage height of the voltage ratio capacitor C 1 of battery A, then battery A gives capacitor C 1 charging through QC1 and QD1, if the voltage height of the voltage ratio battery A of capacitor C 1, then capacitor C 1 is given battery A discharge through QC1 and QD1; Time t1 is a Dead Time to t2, t3 to t4, is used to prevent that two field effect transistor from can not turn-off simultaneously and the straight-through situation of damaging field effect transistor or increasing the field effect transistor loss occurs; And the like, the operation principle of clock cycle afterwards is identical.
As can be seen from the above technical solutions, when the voltage of the voltage ratio battery A of battery B is high, battery B can automatically give capacitor C 1 charging, equals the voltage of battery B up to the voltage of capacitor C 1, then, in the next clock cycle, capacitor C 1 can be given battery A discharge automatically, equals the voltage of capacitor C 1, such charge and discharge process up to the voltage of battery A, the meeting Automatic Cycle is till the voltage of battery A equals the voltage of battery B; Equally, when the voltage of the voltage ratio battery B of battery A is high, battery A can automatically give capacitor C 1 charging, equals the voltage of battery A up to the voltage of capacitor C 1, then, in the next clock cycle, capacitor C 1 can be given battery B discharge automatically, equals the voltage of capacitor C 1, such charge and discharge process up to the voltage of battery B, the meeting Automatic Cycle is till the voltage of battery B equals the voltage of battery A.Because the utility model does not need to be provided with extra cell voltage height detecting apparatus, can produce just can operate as normal as the control Driver Circuit 13 of the drive waveforms of Fig. 3 and Fig. 4 as long as have, and very simple and general of the control Driver Circuit 13 that can reach function like this, for example all can directly drive QA1, QB1, QC1, the QD1 work of electric weight equalizing circuit 12 with numeral generation control circuit or special-purpose waveform generation controlling and driving chip, so circuit structure of the present utility model is simple, production cost is lower.
Please refer to Fig. 6,7, this is embodiment two of the present utility model, different with embodiment one is, described first switch element 121 of present embodiment, second switch unit 122, the 3rd switch element 123, the 4th switch element 124 are respectively N channel field-effect pipe QA1, QB1, QC1, QD1, and charge/discharge unit 125 is a capacitor C 1; The drain electrode of described QA1 is connected with the positive pole of battery B, and the source electrode of QA1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the source electrode of QB1, and the drain electrode of QB1 is connected with the negative pole of battery B; The source electrode of described QC1 is connected with the positive pole of battery A, and the drain electrode of QC1 is connected with the positive pole of capacitor C 1, and the negative pole of capacitor C 1 is connected with the drain electrode of QD1, and the source electrode of QD1 is connected with the negative pole of battery A; The grid of described QA1, QB1, QC1, QD1 all is connected with control Driver Circuit, and other structure and operation principle are identical with embodiment one, therefore repeats no more here.
Please refer to Fig. 8, this is an application examples 1 of the present utility model, it is all to be connected with the electric weight equalizing circuit between two series connected battery, as between battery 1 and battery 2, being connected with electric weight equalizing circuit 1, between battery 2 and battery 3, be connected with electric weight equalizing circuit 2, promptly be connected with N-1 electric weight equalizing circuit in N series connected battery, like this, can make the electric weight of each battery can be by equilibrium, the electric weight of the battery that voltage is higher can be transferred in the lower battery of voltage automatically.
Please refer to Fig. 9, this is an application examples 2 of the present utility model, it is to be composed in series battery pack by a plurality of batteries, not only between two series connected battery, all be connected with the electric weight equalizing circuit, and between two battery pack, all be connected with the electric weight equalizing circuit, like this, can improve the portfolio effect of electric weight between two battery pack.Certainly, in order to satisfy the electric weight equalization request of more battery series connection, a plurality of battery pack tandem compounds can also be become battery modules, not only all be connected with the electric weight equalizing circuit between two series connected battery, between two battery pack, all be connected with the electric weight equalizing circuit, and between two battery modules, also can be connected with the electric weight equalizing circuit, like this, can further improve the portfolio effect of electric weight between two battery modules.
The above only is preferred embodiment of the present utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.

Claims (6)

1, a kind of battery balanced device, it comprises a plurality of batteries that are in series, it is characterized in that: the power delivery that is connected with battery that can voltage is higher between two batteries to the lower battery of voltage, make the electric weight of two batteries obtain balanced electric weight equalizing circuit, the input of described electric weight equalizing circuit is connected with the control Driver Circuit that is used for controlling and driving electric weight equalizing circuit.
2, a kind of battery balanced device according to claim 1, it is characterized in that: described electric weight equalizing circuit comprises first switch element, second switch unit, the 3rd switch element, the 4th switch element and charge/discharge unit;
Anodal two-way connection of described first switch element and battery (B), first switch element is connected with charge/discharge unit is two-way, and charge/discharge unit is connected with the second switch unit is two-way, the two-way connection of negative pole of second switch unit and battery (B);
Anodal two-way connection of described the 3rd switch element and battery (A), the 3rd switch element is connected with charge/discharge unit is two-way, and charge/discharge unit is connected with the 4th switch element is two-way, the two-way connection of negative pole of the 4th switch element and battery (A);
The input of described first switch element, second switch unit, the 3rd switch element, the 4th switch element all is connected with control Driver Circuit.
3, a kind of battery balanced device according to claim 2 is characterized in that: described first switch element is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described second switch unit is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described the 3rd switch element is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its; Described the 4th switch element is to be constituted by a kind of in N channel field-effect pipe, P-channel field-effect transistor (PEFT) pipe, triode, insulated gate bipolar power tube, the relay or its.
4, a kind of battery balanced device according to claim 2 is characterized in that: described charge/discharge unit is to be made of the electrochemical capacitor that can discharge and recharge, tantalum electric capacity, farad capacitor, polarity free capacitor or battery.
5, a kind of battery balanced device according to claim 2, it is characterized in that: described first switch element is P-channel field-effect transistor (PEFT) pipe (QA1), the second switch unit is a N channel field-effect pipe (QB1), the 3rd switch element is a N channel field-effect pipe (QC1), the 4th switch element is a N channel field-effect pipe (QD1), and charge/discharge unit is a capacitor C 1;
The source electrode of described P-channel field-effect transistor (PEFT) pipe (QA1) is connected with the positive pole of battery (B), the drain electrode of P-channel field-effect transistor (PEFT) pipe (QA1) is connected with the positive pole of capacitor C 1, the negative pole of capacitor C 1 is connected with the source electrode of N channel field-effect pipe (QB1), and the drain electrode of N channel field-effect pipe (QB1) is connected with the negative pole of battery (B);
The source electrode of described N channel field-effect pipe (QC1) is connected with the positive pole of battery (A), the drain electrode of N channel field-effect pipe (QC1) is connected with the positive pole of capacitor C 1, the negative pole of capacitor C 1 is connected with the drain electrode of N channel field-effect pipe (QD1), and the source electrode of N channel field-effect pipe (QD1) is connected with the negative pole of battery (A);
The grid of described P-channel field-effect transistor (PEFT) pipe (QA1), N channel field-effect pipe (QB1), N channel field-effect pipe (QC1), N channel field-effect pipe (QD1) all is connected with control Driver Circuit.
6, a kind of battery balanced device according to claim 2, it is characterized in that: described first switch element, second switch unit, the 3rd switch element, the 4th switch element are respectively N channel field-effect pipe (QA1), N channel field-effect pipe (QB1), N channel field-effect pipe (QC1), N channel field-effect pipe (QD1), and charge/discharge unit is a capacitor C 1;
The drain electrode of described N channel field-effect pipe (QA1) is connected with the positive pole of battery (B), the source electrode of N channel field-effect pipe (QA1) is connected with the positive pole of capacitor C 1, the negative pole of capacitor C 1 is connected with the source electrode of N channel field-effect pipe (QB1), and the drain electrode of N channel field-effect pipe (QB1) is connected with the negative pole of battery (B);
The source electrode of described N channel field-effect pipe (QC1) is connected with the positive pole of battery (A), the drain electrode of N channel field-effect pipe (QC1) is connected with the positive pole of capacitor C 1, the negative pole of capacitor C 1 is connected with the drain electrode of N channel field-effect pipe (QD1), and the source electrode of N channel field-effect pipe (QD1) is connected with the negative pole of battery (A);
The grid of described N channel field-effect pipe (QA1), N channel field-effect pipe (QB1), N channel field-effect pipe (QC1), N channel field-effect pipe (QD1) all is connected with control Driver Circuit.
CNU2008202009335U 2008-09-23 2008-09-23 Battery equalizing device Expired - Lifetime CN201298737Y (en)

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Application Number Priority Date Filing Date Title
CNU2008202009335U CN201298737Y (en) 2008-09-23 2008-09-23 Battery equalizing device
PCT/CN2009/072567 WO2010034210A1 (en) 2008-09-23 2009-06-30 Battery equalizer

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