CN106848444A - A kind of battery pack voltage reduction method and reduction voltage circuit - Google Patents
A kind of battery pack voltage reduction method and reduction voltage circuit Download PDFInfo
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- CN106848444A CN106848444A CN201611057420.9A CN201611057420A CN106848444A CN 106848444 A CN106848444 A CN 106848444A CN 201611057420 A CN201611057420 A CN 201611057420A CN 106848444 A CN106848444 A CN 106848444A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention discloses a kind of battery pack voltage reduction method and reduction voltage circuit, and the circuit includes：The first end of each positive switch is connected with the positive pole of a cell, and the second end is connected with one end of output capacitance and a control end of control centre respectively；The first end of each negative switch is connected with the negative pole of a cell, and output capacitance two ends are connected with first voltage output end and second voltage output end respectively.The step of the method, includes：S1, according to target voltage, calculate the joint number of power supply cell every time；S2, the joint number according to power supply cell, determine switch combination, close a switch combination；S3, the size for determining load current, and power-on time is calculated according to the size of the load current；S4, by after power-on time, disconnect current switch combination, close next switch combination；S5, repeat step S3, realization are alternately closed each switch combination, export target voltage.The present invention can reduce transition loss, reduce the interference that change-over circuit is produced.
Description
Technical field
The present invention relates to battery pack pressure drop circuit field, more particularly to a kind of battery pack voltage reduction method and reduction voltage circuit.
Background technology
As widely using for the portable equipment such as automotive electronics and family's energy storage, the purposes of battery pack are more and more wider, use
It is battery-powered as a kind of trend.The power and voltage request needed due to electrical equipment and battery pack itself control circuit are not
Equally, so needing to set in circuit change-over circuit by the voltage conversion of battery pack into electrical equipment required voltage, for example：
Switch control relay etc..And switch is more, the electric current of conversion is bigger, and the loss of change-over circuit is bigger.
Current battery group power supply circuit mainly reduces the loss problem that high current causes by way of reducing voltage.Most
Common step-down mode has two kinds, and one kind is depressured using transistor linearity, and another kind is depressured with on-off circuit.Linear voltage decreasing
Conversion produce voltage disturbance small, but conversion efficiency is than relatively low, and as the liter high efficiency of input voltage can be reduced further,
Additionally, with the increase of electric current, substantial amounts of heat can be produced；Although on-off circuit step-down conversion efficiency is higher than linear voltage decreasing, meeting
Switching harmonics are produced, the stability of electricity consumption device is influenceed, additionally, energy loss is all equally had in transfer process, and with
Electric current increases, and transition loss is further exacerbated by, and then influences vehicle-mounted or portable product design difficulty and development cost.
Because current reduction voltage circuit has transition loss, and transition loss can shorten whole battery pack use time.
In order to make up transition loss, more batteries are increased during deisgn product, and the loss of conversion is all converted to form of heat
Come, so as to radiating treatment must be done to battery again, and then the design volume of product can be increased, increase product development sheet, while
The difficulty of design can be increased.Additionally, existing common reduction voltage circuit is with the increase of load current, loss can further increase, electricity
Road design can be more complicated.
The content of the invention
The purpose of the present invention is to overcome weak point of the prior art, there is provided a kind of battery pack voltage reduction method and step-down electricity
Road, the present invention can reduce transition loss, reduce the interference that change-over circuit is produced.
The purpose of the present invention is achieved through the following technical solutions：
A kind of battery pack voltage reduction method, including：Multiple cells connect in a series arrangement composition battery pack, several
Positive switch, several negative switch, output capacitance and control centre；
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with the output capacitance
The one control end connection of one end and control centre；
The first end of each negative switch is connected with the negative pole of a cell, the second end respectively with the output capacitance
Another control end connection of the other end and control centre；
The output capacitance two ends are connected with first voltage output end and second voltage output end respectively；
The step of the method, includes：
S1, according to target voltage, calculate the joint number of power supply cell every time；
S2, the joint number according to power supply cell, determine switch combination, switch combination described in closure one；The switches set
Conjunction includes negative switch described in positive switch described in one and；
S3, the size for determining load current, and power-on time is calculated according to the size of the load current；
S4, by after power-on time, disconnect current switch combination, close next switch combination；
S5, repeat step S3, realization are alternately closed each switch combination, export target voltage.
Used as further preferred scheme, the step S2 determines switch combination, closes according to the joint number of power supply cell
The step of unifying the switch combination is specially：
Each switch combination is determined since lowest section cell, the combination where closure lowest section cell is opened
Close.
Used as further preferred scheme, the step S2 determines switch combination, closes according to the joint number of power supply cell
The step of unifying the switch combination is specially：
Each switch combination is determined since lowest section cell, the combination where closure highest section cell is opened
Close.
Used as further preferred scheme, the step S3 determines the size of load current, and according to the load current
The step of size calculates power-on time is specially：
The power-on time H=V/C, wherein C are load current, and V is target voltage.
Used as further preferred scheme, the step S3 also includes：
According to the size of load current, the size of output capacitance is calculated；
The output capacitance Cn=A*C*V, wherein A are power conversion coefficient corresponding with filter circuit.
The present invention discloses a kind of battery pack voltage reduction method, according to the size of target voltage, controls each cell two ends
Positive switch and negative switch break-make, with reach output stabilization target voltage.Directly by positive switch and negative switch
To control battery pack to be depressured so that transition loss is preferably minimized, the purpose of lossless step-down is reached.Meanwhile, in order to avoid length
Time, alternating switched the break-make of different positive switch and negative switch, to reach battery to one group of cell continuous discharge
Cell Uniform Discharge in group, prevents cell and crosses the phenomenon put, and reduces the difference between cell, improves electricity
The security and stability of pond group.
The present invention also provides a kind of battery pack reduction voltage circuit, including：Multiple cells connect composition in a series arrangement
Battery pack, several positive switch, several negative switch, output capacitance and control centre；
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with the output capacitance
The one control end connection of one end and control centre；
The first end of each negative switch is connected with the negative pole of a cell, the second end respectively with the output capacitance
Another control end connection of the other end and control centre；
The output capacitance two ends are connected with first voltage output end and second voltage output end respectively.
As further preferred scheme, also including voltage detection unit, the test side of the voltage detection unit and institute
State the common point connection of the first end of output capacitance and the positive switch, the output end of the voltage detection unit and the control
The detection input connection at center processed.
As further preferred scheme, the unit detection unit include first resistor, second resistance, sampling resistor,
First electric capacity and power supply；
The power supply is grounded through the first resistor, the second resistance；One end of the sampling resistor with it is described
Output capacitance is connected, and the other end is connected with the common point of the first resistor and the second resistance；
First electric capacity is connected in parallel with the second resistance；
The common point of the first resistor and the second resistance also connects with the detection input of the control centre
Connect.
Used as further preferred scheme, the output capacitance is made up of several monomer electric capacity with parallel way connection.
Used as further preferred scheme, the positive switch and the negative switch are relay or metal-oxide-semiconductor.
The present invention compared to prior art advantage and have the beneficial effect that：
1st, the present invention is a kind of battery pack voltage reduction method and reduction voltage circuit, due in positive switch, negative switch and control
Power consumption produced by the heart is very low, so not producing transition loss substantially, improves conversion efficiency.And with load current
Increase, the reduction voltage circuit conversion efficiency is higher, and compared to existing pressure drop circuit, energy loss is lower.
2nd, the present invention provides a kind of battery pack reduction voltage circuit, and the voltage for reducing change-over circuit generation by output capacitance is done
Disturb, improve the stability of the pressure drop circuit.
3rd, the present invention provides a kind of battery pack reduction voltage circuit and is provided with control centre, alternately can control all of positive switch
With negative switch break-make so that each cell can have the uniform discharge and recharge time, it is to avoid cell occur and cross what is put
Phenomenon, reduces the difference between cell, improves the security of battery pack.
4th, the present invention provides a kind of battery pack reduction voltage circuit and is provided with output capacitance, and output capacitance according to output current
Big I multiple monomer electric capacity in parallel, so that the circuit is smaller than traditional pressure drop circuit conversion ripple, further reduces conversion electricity
The interference that road produces.
5th, a kind of battery pack reduction voltage circuit is additionally provided with voltage detection unit, can be to the electricity after each cell or packet
Pond carries out voltage detecting, is determined during work according to the voltage for detecting, the length of positive switch and negative switch closing time.
6th, the circuit design advantages of simple of battery pack reduction voltage circuit of the invention, can improve reduction voltage circuit stability and
Security.
Brief description of the drawings
Fig. 1 is the theory diagram of the battery pack pressure drop circuit of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the battery pack reduction voltage circuit of the embodiment of the present invention；
Fig. 3 is the flow chart of the battery pack voltage reduction method of the embodiment of the present invention.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give better embodiment of the invention.But, the present invention can be realized in many different forms, however it is not limited to herein
Described implementation method.On the contrary, the purpose for providing these implementation methods is to make to understand more the disclosure
Plus it is thorough comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element
Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique implementation method to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the implementation method of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all of combination of related Listed Items.
Embodiment one
Also referring to Fig. 1 and Fig. 2, the present invention provides a kind of battery pack reduction voltage circuit 10 to be included：Multiple cells with
Battery pack, several positive switch, several negative switch, output capacitance and control centre that series system connection is constituted.
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with the output capacitance
The one control end connection of one end and control centre；The first end of each negative switch is connected with the negative pole of a cell, and second
End is connected with the other end of the output capacitance and another control end of control centre respectively；The output capacitance two ends respectively with
First voltage output end and second voltage output end are connected.Further, the control centre is MCU, and the MCU receives output
The output voltage Vout at electric capacity two ends, and control each positive switch and each negative pole to open according to output voltage Vout
The switch motion of pass, so that battery pack regulated output voltage.
Specifically, Fig. 3 is referred to, the battery pack voltage reduction method 20 of control centre's control comprises the following steps：
S1, control centre calculate the joint number of power supply cell every time according to target voltage.For example：The electricity of cell
It is Un to press, and target voltage is V, and the joint number that can obtain power supply cell every time is N=Un/V.
S2, the joint number according to power supply cell, determine switch combination, switch combination described in closure one；The switches set
Conjunction includes negative switch described in positive switch described in one and.The joint number N of power supply cell is calculated by step S1, then may be used
During determining that each cell is powered, the switch combination of control centre's closure, i.e., control centre closes positive switch and bear
Pole switchs.The step S2 determines switch combination, described in closure one the step of switch combination according to the joint number of power supply cell
Specially：Each switch combination, the stacked switch where closure lowest section cell are determined since lowest section cell.
For example：If during the joint number N=1 of cell of powering, illustrating only one of which cell as power supply,
Each switch combination that may thereby determine that is specially：First group of switch is closed and includes the first positive switch and the first negative switch；
Second switch combination includes the second positive switch and the second negative switch；…；N-th switch combination includes the n-th positive switch and n-th
Negative switch.So now by the switch combination where closing first segment cell, i.e., first group switch combination includes first
Positive switch and the first negative switch.
If during the joint number N=2 of cell of powering, having illustrated that two cells, can be true used as power supply
Each fixed switch combination is specially：First switch combination includes the first positive switch and the second negative switch；Second switch group
Conjunction includes the 3rd positive switch and the 4th negative switch；…；Last switch combination is negative including the (n-1)th positive switch and n-th
Pole switchs.So the first switch combination for now closing includes the first positive switch and the second negative switch.
Certainly the stacked switch where closing highest section cell can also be controlled here.Since the battery of highest section
Each switch combination is closed successively.
S3, the size for determining load current, and power-on time is calculated according to the size of the load current.The step S3 tools
Body is：The power-on time H=V/C, wherein C are load current, and V is target voltage.It will be clear that load current is got over
Greatly, conduction time is shorter；Load current is smaller, and conduction time is more long.
The step S3 also includes：According to the size of load current, the size of output capacitance is calculated.The output capacitance Cn
=A*C*V, wherein A are power conversion coefficient corresponding with filter circuit.The size of output capacitance Cn with actually use output power
It is relevant, for solving the ripple of switch switching moment；Multiple monomer electric capacity in parallel can reduce conversion interference, filter switch switching
The ripple of generation, improves the stability of circuit.
S4, by after power-on time, disconnect current switch combination, close next switch combination.To describe herein
It is in general, since first switch is combined, each switch combination to be closed successively.
S5, repeat step S3, realization are alternately closed each switch combination, export target voltage.Combined when from first switch
It is alternately closed to last switch combination, first switch combination is closed again, the cell of control is combined by first switch
Power supply.The operation of next step is carried out again.
It is noted that the battery pack reduction voltage circuit also includes voltage detection unit 200, the voltage detection unit
Test side is connected with the common point of the output capacitance Cn and the first end of the positive switch, the voltage detection unit it is defeated
Go out end to be connected with the detection input of the control centre 100.
Specifically, the unit detection unit includes first resistor R1, second resistance R2, sampling resistor Rs, the first electric capacity
C1 and power supply VCC.The power supply is grounded through the first resistor R1, the second resistance R2；The sampling resistor
One end of Rs is connected with the output capacitance C, and the other end connects with the common point of the first resistor R1 and the second resistance R2
Connect.The first electric capacity C1 is connected in parallel with the second resistance R2.The first resistor R1 and second resistance R2
Detection input of the common point also with the control centre 100 be connected.
The voltage detection unit is used to carry out voltage detecting, root to the cell group after each cell or packet
The closing time length switched during work is determined according to the voltage of the cell group after cell or packet.For example：If working as
The voltage of the cell group after the cell of preceding electric discharge or packet is higher than cell group after all cells or packet
Average voltage when, its correspondence switch-closed time be H1Minute, H1More than H, preferably H1=H+0.1min；If present discharge
Cell or packet after cell group voltage less than all cells or packet after cell group it is average
During voltage, its correspondence switch-closed time is H2Minute, H2Less than H, preferably H2=H-0.1min.
Embodiment two
Referring to Fig. 1, the present invention also provides a kind of battery pack reduction voltage circuit, including：Multiple cells are connecting
Mode connects battery pack, several positive switch, several negative switch, output capacitance Cn and the control centre 100 of composition.
Cell BT provides power supply for load circuit, and positive switch is used to control the positive pole of cell BT to export, bears
Pole is switched for controlling the negative pole of cell to export, and output capacitance Cn is used to filter the ripple of switch switching moment.In control
The heart 100 is used to control closure or the disconnection of positive switch and negative switch.The control centre is MCU.The positive switch and
Negative switch is relay or metal-oxide-semiconductor.The output capacitance is composed in parallel by several monomer electric capacity.
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with the output capacitance Cn
One end and control centre a control end connection.The first end of each negative switch is connected with the negative pole of a cell, the
Two ends are connected with the other end of the output capacitance Cn and another control end of control centre respectively.The output capacitance Cn two ends
It is connected with first voltage output end and second voltage output end respectively.
In Fig. 1, battery pack includes multiple cells, respectively BT1, BT2, BT3 ..., BTn.Several positive poles are opened
Close, respectively S1+, S2+, S3+ ..., Sn+.Several positive switch, respectively S1-, S2-, S3- ..., Sn-.It is described each
Cell is corresponded with positive switch and negative switch, i.e. the positive pole of the first cell BT1 and the first positive switch S1+
Connection, negative pole is connected with the first negative switch S1-, and the positive pole of second comonomer battery BT2 is connected with the second positive switch S2+, bears
Pole is connected with the second negative switch S2-, and the positive pole of Third monomer battery BT3 is connected with the 3rd positive switch S3+, negative pole and the 3rd
Negative switch S3- is connected, and the positive pole to the n-th cell BTn is connected with the n-th positive switch Sn+ by that analogy, negative pole and n-th
Negative switch Sn- is connected.Meanwhile, the negative pole of the first cell BT1 and the positive pole of second comonomer battery BT2 are connected in series, the
The negative pole of two cell BT2 and the positive pole of Third monomer battery BT3 are connected in series, by that analogy.
It is noted that the battery pack reduction voltage circuit also includes voltage detection unit 200, the voltage detection unit
Test side is connected with the common point of the output capacitance Cn and the first end of the positive switch, the voltage detection unit it is defeated
Go out end to be connected with the detection input of the control centre 100.
Specifically, the unit detection unit includes first resistor R1, second resistance R2, sampling resistor Rs, the first electric capacity
C1 and power supply VCC.The power supply is grounded through the first resistor R1, the second resistance R2；The sampling resistor
One end of Rs is connected with the output capacitance C, and the other end connects with the common point of the first resistor R1 and the second resistance R2
Connect.The first electric capacity C1 is connected in parallel with the second resistance R2.The first resistor R1 and second resistance R2
Detection input of the common point also with the control centre 100 be connected.
The capacitance of first electric capacity substantially takes 0.1U and 1U, because MCU is powered by VCC, so the ginseng inside MCU
Examine voltage lower than VCC.In order to avoid AI sampled voltages exceed sample range, we take VCC/2, i.e. first resistor R1, second
Resistance R2 carries out partial pressure.Rs is sampling isolation resistance, it is to avoid high current damages MCU samplings.
The voltage detection unit is used to carry out voltage detecting, root to the cell group after each cell or packet
The closing time length switched during work is determined according to the voltage of the cell group after cell or packet.For example：If working as
The voltage of the cell group after the cell of preceding electric discharge or packet is higher than cell group after all cells or packet
Average voltage when, its correspondence switch-closed time be H1Minute, H1More than H, preferably H1=H+0.1min；If present discharge
Cell or packet after cell group voltage less than all cells or packet after cell group it is average
During voltage, its correspondence switch-closed time is H2Minute, H2Less than H, preferably H2=H-0.1min.
The course of work：
The control centre 100 determines that the output capacitance two ends need the size of target voltage；Further according to needing target
The size of voltage, controls the switch motion of each described positive switch and each negative switch, to export the target of stabilization
Voltage.
Further, control centre 100 calculates the joint number of power supply cell every time according to target voltage.For example：Monomer
The voltage of battery is Un, and target voltage is V, and the joint number that can obtain power supply cell every time is N=Un/V.It is described as power supply
Cell number no more than cell sum.The control centre 100 according to power supply cell joint number, really
Determine switch combination, switch combination described in closure one；The switch combination includes negative switch described in positive switch and described in.
The control centre 100 determines the size of load current, and calculates power-on time according to the size of the load current.The power supply
Time H=V/C, wherein C are load current, and V is target voltage.Here also include calculating the size of output capacitance Cn, it is described defeated
Go out electric capacity Cn=A*C*V, wherein A is power conversion coefficient corresponding with filter circuit.By after power-on time, disconnecting current
Switch combination, the control next switch combination of closure of control centre 100.It will be clear that in general, from first switch
Combination starts, and each switch combination is closed successively.It is again heavy after last switch combination is closed to from first switch combination
New closure first switch combination, disconnects other and opens combination, and the process is circulated again, and realization is alternately closed each switch combination,
Output target voltage.
Control centre 100 controls positive switch and negative switch closure or the detailed process for disconnecting：For example：If power supply is single
During the joint number N=1 of body battery, then illustrate only one of which cell as power supply, each switch that may thereby determine that
Combination is specially：First group of switch is closed and includes the first positive switch and the first negative switch；Second switch combination is including second just
Pole switchs and the second negative switch；…；N-th switch combination includes the n-th positive switch and the n-th negative switch.So now controlling
Center 100 by the switch combination where closing first segment cell, i.e., first group switch combination include the first positive switch and
First negative switch, control centre 100 controls other switch combinations to disconnect.By after power-on time, disconnecting first switch group
Close, closure second switch combination, by that analogy, a to the last switch combination.Then start to close first switch again
Combination.
If during the joint number N=2 of cell of powering, having illustrated that two cells, can be true used as power supply
Each fixed switch combination is specially：First switch combination includes the first positive switch and the second negative switch；Second switch group
Conjunction includes the 3rd positive switch and the 4th negative switch；…；Last switch combination is negative including the (n-1)th positive switch and n-th
Pole switchs.So now the first switch combination of the closure of control centre 100 includes the first positive switch and the second negative switch, control
Center processed 100 controls other switch combinations to disconnect.By after power-on time, disconnecting first switch combination, second switch is closed
Combination, by that analogy, a to the last switch combination.Then closure first switch combination is started again.
Certainly the stacked switch where closing highest section cell can also be controlled here, that is, close the n-th switch combination,
Other switch combinations are disconnected, each switch combination is closed successively since the cell of highest section.
Control centre 100 can be controlled the break-make of corresponding switch combination according to the joint number of power supply cell, enter
And battery pack can be controlled to be depressured.The controlling switch combination circulation closure of control centre 100, can avoid cell or divide
Cell group continuous discharge after group, it is to avoid cell occur and cross the phenomenon put, reduce the difference between cell, carry
The safety and stability of battery pack high.
Output capacitance Cn in circuit can be according to the big I of output current multiple monomer electric capacity in parallel, so that the electricity
Road is smaller than traditional pressure drop circuit conversion ripple, reduces conversion interference, improves the stability of the pressure drop circuit.
Because the power consumption produced by positive switch, negative switch and control centre is very low, so not producing conversion substantially
Loss, improves conversion efficiency.And with the increase of load current, the reduction voltage circuit conversion efficiency is higher, compared to existing
Pressure drop circuit, energy loss is lower.
The above implementation method only expresses several embodiments of the invention, and its description is more specific and detailed, but
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for the ordinary skill people of this area
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to of the invention
Protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of battery pack voltage reduction method, it is characterised in that including：Multiple cells connect the battery of composition in a series arrangement
Group, several positive switch, several negative switch, output capacitance and control centre (100)；
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with one end of the output capacitance
A control end with control centre (100) is connected；
The first end of each negative switch is connected with the negative pole of a cell, and the second end is another with the output capacitance respectively
Another control end of end and control centre (100) is connected；
The output capacitance two ends are connected with first voltage output end and second voltage output end respectively；
The step of the method, includes：
S1, according to target voltage, calculate the joint number of power supply cell every time；
S2, the joint number according to power supply cell, determine switch combination, switch combination described in closure one；The switch combination bag
Include negative switch described in positive switch described in one and；
S3, the size for determining load current, and power-on time is calculated according to the size of the load current；
S4, by after power-on time, disconnect current switch combination, close next switch combination；
S5, repeat step S3, realization are alternately closed each switch combination, export target voltage.
2. battery pack voltage reduction method according to claim 1, it is characterised in that the step S2 is according to power supply cell
Joint number, determine switch combination, be specially the step of switch combination described in closure one：
Each switch combination, the stacked switch where closure lowest section cell are determined since lowest section cell.
3. battery pack voltage reduction method according to claim 1, it is characterised in that the step S2 is according to power supply cell
Joint number, determine switch combination, be specially the step of switch combination described in closure one：
Each switch combination, the stacked switch where closure highest section cell are determined since lowest section cell.
4. battery pack voltage reduction method according to claim 1, it is characterised in that the step S3 determines the big of load current
It is small, and be specially according to the step of the size of load current calculating power-on time：
The power-on time H=V/C, wherein C are load current, and V is target voltage.
5. battery pack voltage reduction method according to claim 4, it is characterised in that the step S3 also includes：
According to the size of load current, the size of output capacitance is calculated；
The output capacitance Cn=A*C*V, wherein A are power conversion coefficient corresponding with filter circuit.
6. a kind of battery pack reduction voltage circuit, it is characterised in that including：Multiple cells connect the battery of composition in a series arrangement
Group, several positive switch, several negative switch, output capacitance and control centre (100)；
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with one end of the output capacitance
A control end with control centre (100) is connected；
The first end of each negative switch is connected with the negative pole of a cell, and the second end is another with the output capacitance respectively
Another control end of end and control centre (100) is connected；
The output capacitance two ends are connected with first voltage output end and second voltage output end respectively.
7. battery pack pressure drop circuit according to claim 6, it is characterised in that described also including voltage detection unit (200)
The test side of voltage detection unit (200) is connected with the common point of the output capacitance and the first end of the positive switch, institute
The output end for stating voltage detection unit (200) is connected with the detection input of the control centre (100).
8. battery pack pressure drop circuit according to claim 7, it is characterised in that the unit detection unit includes the first electricity
Resistance, second resistance, sampling resistor, the first electric capacity and power supply；
The power supply is grounded through the first resistor, the second resistance；One end of the sampling resistor and the output
Capacitance connection, the other end is connected with the common point of the first resistor and the second resistance；
First electric capacity is connected in parallel with the second resistance；
The common point of the first resistor and the second resistance also connects with the detection input of the control centre (100)
Connect.
9. battery pack pressure drop circuit according to claim 6, it is characterised in that the output capacitance is by several monomer electric capacity
Connected with parallel way and constituted.
10. battery pack pressure drop circuit according to claim 6, it is characterised in that the positive switch and the negative switch
It is relay or metal-oxide-semiconductor.
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