CN106786953B - Batteries in parallel connection group equilibrium system and method - Google Patents

Batteries in parallel connection group equilibrium system and method Download PDF

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Publication number
CN106786953B
CN106786953B CN201710010191.3A CN201710010191A CN106786953B CN 106786953 B CN106786953 B CN 106786953B CN 201710010191 A CN201710010191 A CN 201710010191A CN 106786953 B CN106786953 B CN 106786953B
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resistance
current
parallel
operational amplifier
pcbu
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CN106786953A (en
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李锐
余佳玲
何俊强
刘小丽
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Chongqing Yaxun Power Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • 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
    • 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
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention provides a kind of batteries in parallel connection group equilibrium system and method, system includes the n single battery BT in parallel for load R power supplyi, 1≤i≤n, n are the integer greater than 1, are in series with resistance R in the parallel branch of each single batteryi, and resistance R1To resistance Rn‑1On be provided with parallel-current balanced unit PCBU, the parallel-current balanced unit PCBU is provided with current-differencing sampling line W1, current-differencing sample line W2, electric current adjust input line W3And electric current adjusts output line W4；For resistance RiFor corresponding parallel-current balanced unit PCBU, current-differencing samples line W1Connect single battery BTiAnode, current-differencing sample line W2Connect single battery BTi+1Anode, electric current adjust input line W3Output line W is adjusted with electric current4It is correspondingly connected in resistance RiBoth ends, the present invention provides effective batteries in parallel connection group equalization methods, improve the service life of batteries in parallel connection group.

Description

Batteries in parallel connection group equilibrium system and method
Technical field
The present invention relates to battery pack equilibrium management technical fields, and in particular to a kind of equal balance system of batteries in parallel connection group and its side Method.
Background technique
It is limited by monomer battery voltage grade and capacity, in engineer application, in order to obtain biggish voltage and hold Grade is measured, is usually used in groups by single battery is in series or in parallel, current battery management has more series-connected cell group balanced Management method and system, but the equal balance system shortage opposite with equalization methods of batteries in parallel connection group.And batteries in parallel connection group longtime running Internal battery pack circulation will be will lead to, seriously compromise the service life of battery pack.
Summary of the invention
The application is by providing a kind of batteries in parallel connection group equilibrium system and method, to solve batteries in parallel connection group longtime running And the technical issues of leading to internal battery pack circulation, seriously damaging the service life of battery pack.
In order to solve the above technical problems, the application is achieved using following technical scheme:
A kind of equal balance system of batteries in parallel connection group, including the n single battery BT in parallel for load R power supplyi, 1≤i≤n, N is the integer greater than 1, it is critical that being in series with resistance R in the parallel branch of each single batteryi, and resistance R1To electricity Hinder Rn-1On be provided with parallel-current balanced unit PCBU, the parallel-current balanced unit PCBU is provided with current-differencing and adopts Line-transect W1, current-differencing sample line W2, electric current adjust input line W3And electric current adjusts output line W4；
For resistance RiFor corresponding parallel-current balanced unit PCBU, current-differencing samples line W1Connect single battery BTiAnode, current-differencing sample line W2Connect single battery BTi+1Anode, electric current adjust input line W3It is adjusted with electric current defeated Outlet W4It is correspondingly connected in resistance RiBoth ends.
Resistance RiThe resistance of simultaneous overcurrent protection is sampled for batteries in parallel connection group internal circuit.
Further, the batteries in parallel connection balanced unit PCBU include sequentially connected difference reverse amplification circuit, it is reversed Summing circuit, bleeder circuit and power flow, wherein the current-differencing of the parallel-current balanced unit PCBU samples line W1With Current-differencing samples line W2For two input terminals of the difference reverse amplification circuit, amplification differential voltage U is obtained1, by described Differential voltage is further amplified in reversed summing circuit, obtains voltage U2, the power flow progress bidirectional current control.
Further, the difference reverse amplification circuit includes resistance R11, resistance R22, resistance R12, resistance R21And operation is put Big device U1B, wherein the current-differencing of the parallel-current balanced unit PCBU samples line W1Through resistance R11The operation is connected to put Big device U1BInverting input terminal, the current-differencing of the parallel-current balanced unit PCBU samples line W2Through resistance R22Described in connection Operational amplifier U1BNon-inverting input terminal, the operational amplifier U1BNon-inverting input terminal through resistance R21Ground connection, the resistance R21 It is connected on the operational amplifier U1BInverting input terminal and the operational amplifier U1BOutput end between, the operation is put Big device U1BOutput end through filter capacitor C1Ground connection, the operational amplifier U1BOutput end output amplification differential voltage U1；
The reversed summing circuit includes resistance R31, resistance R32, resistance R33, resistance R34And operational amplifier U2B, wherein Amplify differential voltage U1Through resistance R32It is input to the operational amplifier U2BInverting input terminal, meanwhile, ration the power supply under system tolerant Press VrefPass through the resistance R31It is input to the operational amplifier U2BInverting input terminal, the operational amplifier U2BSame phase Input terminal is through the resistance R34Ground connection, the resistance R33It is connected on the operational amplifier U2BInverting input terminal and the fortune Calculate amplifier U2BOutput end between, the operational amplifier U2BOutput end pass through filter capacitor C2Ground connection, the operation are put Big device U2BOutput end output amplification differential voltage U2；
Resistance R51With resistance R52It is composed in series bleeder circuit, the power flow includes NMOS switch pipe Q1And NMOS switch Pipe Q2, wherein the NMOS switch pipe Q1Grid and the NMOS switch pipe Q2Grid be both connected to resistance R51And resistance R52Between, resistance R51The other end connect the operational amplifier U2BOutput end, resistance R52The other end ground connection, it is described NMOS switch pipe Q1Source electrode and the NMOS switch pipe Q2Source electrode be connected, the NMOS switch pipe Q1Drain electrode connect electric current tune Whole input line W3, the NMOS switch pipe Q2Drain electrode connect electric current adjustment output line W4。
It further, further include clamp diode D1, the clamp diode D1Cathode connect the operational amplifier U2BOutput end, the clamp diode D1Plus earth.
Further, R11=R22,R12=R21,U1=-(UW1-UW2)*R12/R11,
A kind of equalization methods of the equal balance system of batteries in parallel connection group, include the following steps:
S1: the initial value that K is arranged is 1, starts to be controlled with first parallel branch；
S2: using parallel-current balanced unit PCBU to the branch current I of the K articles parallel branchKWith the K+1 articles parallel connection branch The branch current I on roadK+1It is compared, works as IK< IK+1When, enter step S3；Otherwise parallel-current balanced unit PCBU truncation the The electric current of K parallel branch, so that IK=0 and enter step S6；
S3: parallel-current balanced unit PCBU continue to compare whether IK+1-IK> Vref*R33/R32, if it is, entering step Rapid S4, otherwise the electric current of the K articles parallel branch is truncated in parallel-current balanced unit PCBU, so that IK=0 and enter step S6；
The amplification differential voltage U of S4: parallel-current balanced unit PCBU output2It is gradually increased；
The branch current I of S5: the K articles parallel branchKIt is gradually increased；
S6: setting K=K+1, to next parallel branch in the way of step S2- step S5 under the conditions of meeting K≤n It is controlled, until equilibrium terminates.
By the parallel-current balanced unit PCBU according to adjacent current difference, the current value by itself is adjusted, thus Achieve the purpose that balanced each single battery output input current.
Compared with prior art, technical solution provided by the present application, the technical effect or advantage having are:
Effective batteries in parallel connection group equalization methods are provided, the service life of batteries in parallel connection group is improved.
Detailed description of the invention
Fig. 1 is batteries in parallel connection group equilibrium system schematic；
Fig. 2 is parallel-current balanced unit basic circuit diagram；
Fig. 3 is batteries in parallel connection group equilibrium system power schematic diagram；
Fig. 4 is batteries in parallel connection group equalization methods flow chart.
Specific embodiment
The embodiment of the present application is by providing a kind of batteries in parallel connection group equilibrium system and method, to solve batteries in parallel connection group leader The technical issues of phase runs and leads to internal battery pack circulation, the serious service life for damaging battery pack.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments, it is right Above-mentioned technical proposal is described in detail.
Embodiment
A kind of equal balance system of batteries in parallel connection group, as shown in Figure 1, including the n single batteries in parallel for load R power supply BTi, 1≤i≤n, n are the integer greater than 1, are in series with resistance R in the parallel branch of each single batteryi, and resistance R1To electricity Hinder Rn-1On be provided with parallel-current balanced unit PCBU, the parallel-current balanced unit PCBU is provided with current-differencing and adopts Line-transect W1, current-differencing sample line W2, electric current adjust input line W3And electric current adjusts output line W4；
For resistance RiFor corresponding parallel-current balanced unit PCBU, current-differencing samples line W1Connect single battery BTiAnode, current-differencing sample line W2Connect single battery BTi+1Anode, electric current adjust input line W3It is adjusted with electric current defeated Outlet W4It is correspondingly connected in resistance RiBoth ends, resistance RiThe resistance of simultaneous overcurrent protection is sampled for batteries in parallel connection group internal circuit.
The batteries in parallel connection balanced unit PCBU include sequentially connected difference reverse amplification circuit, reversed summing circuit, Bleeder circuit and power flow, wherein the current-differencing of the parallel-current balanced unit PCBU samples line W1And current-differencing Sample line W2For two input terminals of the difference reverse amplification circuit, amplification differential voltage U is obtained1, by the reversed summation Differential voltage is further amplified in circuit, obtains voltage U2, the power flow progress bidirectional current control.
As shown in Fig. 2, the difference reverse amplification circuit includes resistance R11, resistance R22, resistance R12, resistance R21And operation Amplifier U1B, wherein the current-differencing of the parallel-current balanced unit PCBU samples line W1Through resistance R11Connect the operation Amplifier U1BInverting input terminal, the current-differencing of the parallel-current balanced unit PCBU samples line W2Through resistance R22Connection institute State operational amplifier U1BNon-inverting input terminal, the operational amplifier U1BNon-inverting input terminal through resistance R21Ground connection, the resistance R21It is connected on the operational amplifier U1BInverting input terminal and the operational amplifier U1BOutput end between, the operation Amplifier U1BOutput end through filter capacitor C1Ground connection, the operational amplifier U1BOutput end output amplification differential voltage U1。 R11=R22,R12=R21,U1=-(UW1-UW2)*R12/R11。
The reversed summing circuit includes resistance R31, resistance R32, resistance R33, resistance R34And operational amplifier U2B, wherein Amplify differential voltage U1Through resistance R32It is input to the operational amplifier U2BInverting input terminal, meanwhile, ration the power supply under system tolerant Press VrefPass through the resistance R31It is input to the operational amplifier U2BInverting input terminal, the operational amplifier U2BSame phase Input terminal is through the resistance R34Ground connection, the resistance R33It is connected on the operational amplifier U2BInverting input terminal and the fortune Calculate amplifier U2BOutput end between, the operational amplifier U2BOutput end pass through filter capacitor C2Ground connection, the operation are put Big device U2BOutput end output amplification differential voltage U2。The clamp diode D1Cathode Connect the operational amplifier U2BOutput end, the clamp diode D1Plus earth, clamp diode D1Play protection The effect of rear end NMOS switch pipe.
Resistance R51With resistance R52It is composed in series bleeder circuit, the power flow includes NMOS switch pipe Q1And NMOS switch Pipe Q2, wherein the NMOS switch pipe Q1Grid and the NMOS switch pipe Q2Grid be both connected to resistance R51And resistance R52Between, resistance R51The other end connect the operational amplifier U2BOutput end, resistance R52The other end ground connection, it is described NMOS switch pipe Q1Source electrode and the NMOS switch pipe Q2Source electrode be connected, the NMOS switch pipe Q1Drain electrode connect electric current tune Whole input line W3, the NMOS switch pipe Q2Drain electrode connect electric current adjustment output line W4。
When single battery electric discharge, size of current is by NMOS switch pipe Q2It determines, and passes through NMOS switch pipe Q1Body diode Current path is formed, when single battery charging, size of current is by NMOS switch pipe Q1It determines, and passes through NMOS switch pipe Q2Body Diode forms current path.
Fig. 3 show the current diagram of the equal balance system of batteries in parallel connection group.
A kind of equalization methods of the equal balance system of batteries in parallel connection group, as shown in figure 4, including the following steps:
S1: the initial value that K is arranged is 1, starts to be controlled with first parallel branch；
S2: using parallel-current balanced unit PCBU to the branch current I of the K articles parallel branchKWith the K+1 articles parallel connection branch The branch current I on roadK+1It is compared, works as IK< IK+1When, enter step S3；Otherwise parallel-current balanced unit PCBU truncation the The electric current of K parallel branch, so that IK=0 and enter step S6；
S3: parallel-current balanced unit PCBU continue to compare whether IK+1-IK> Vref*R33/R32, if it is, entering step Rapid S4, otherwise the electric current of the K articles parallel branch is truncated in parallel-current balanced unit PCBU, so that IK=0 and enter step S6；
The amplification differential voltage U of S4: parallel-current balanced unit PCBU output2It is gradually increased；
The branch current I of S5: the K articles parallel branchKIt is gradually increased；
S6: setting K=K+1, to next parallel branch in the way of step S2- step S5 under the conditions of meeting K≤n It is controlled, until equilibrium terminates.
By the parallel-current balanced unit PCBU according to adjacent current difference, the current value by itself is adjusted, thus Achieve the purpose that balanced each single battery output input current.
In above-described embodiment of the application, by providing a kind of batteries in parallel connection group equilibrium system and method, including it is negative Carry n single battery BT in parallel of R power supplyi, 1≤i≤n, n are integer greater than 1, in the parallel branch of each single battery It is in series with resistance Ri, and resistance R1To resistance Rn-1On be provided with parallel-current balanced unit PCBU, the parallel-current is equal Weighing apparatus unit PCBU is provided with current-differencing sampling line W1, current-differencing sample line W2, electric current adjust input line W3And electric current adjustment Output line W4；For resistance RiFor corresponding parallel-current balanced unit PCBU, current-differencing samples line W1Connect single battery BTiAnode, current-differencing sample line W2Connect single battery BTi+1Anode, electric current adjust input line W3It is adjusted with electric current defeated Outlet W4It is correspondingly connected in resistance RiBoth ends.The present invention provides effective batteries in parallel connection group equalization methods, improve electricity in parallel The service life of pond group.
It should be pointed out that the above description is not a limitation of the present invention, the present invention is also not limited to the example above, Variation, modification, addition or the replacement that those skilled in the art are made within the essential scope of the present invention, are also answered It belongs to the scope of protection of the present invention.

Claims (4)

1. a kind of equal balance system of batteries in parallel connection group, including the n single battery BT in parallel for load R power supplyi, 1≤i≤n, n are Integer greater than 1, which is characterized in that resistance R is in series in the parallel branch of each single batteryi, and resistance R1To resistance Rn-1On be provided with parallel-current balanced unit PCBU, the parallel-current balanced unit PCBU is provided with current-differencing sampling Line W1, current-differencing sample line W2, electric current adjust input line W3And electric current adjusts output line W4；
For resistance RiFor corresponding parallel-current balanced unit PCBU, current-differencing samples line W1Connect single battery BTi's Anode, current-differencing sample line W2Connect single battery BTi+1Anode, electric current adjust input line W3Output line W is adjusted with electric current4 It is correspondingly connected in resistance RiBoth ends；
The batteries in parallel connection balanced unit PCBU includes sequentially connected difference reverse amplification circuit, reversed summing circuit, partial pressure Circuit and power flow, wherein the current-differencing of the parallel-current balanced unit PCBU samples line W1It is sampled with current-differencing Line W2For two input terminals of the difference reverse amplification circuit, amplification differential voltage U is obtained1, by the reversed summing circuit Differential voltage is further amplified, obtains voltage U2, the power flow progress bidirectional current control；
The difference reverse amplification circuit includes resistance R11, resistance R22, resistance R12, resistance R21And operational amplifier U1B, wherein The current-differencing of the parallel-current balanced unit PCBU samples line W1Through resistance R11Connect the operational amplifier U1BReverse phase The current-differencing of input terminal, the parallel-current balanced unit PCBU samples line W2Through resistance R22Connect the operational amplifier U1B Non-inverting input terminal, the operational amplifier U1BNon-inverting input terminal through resistance R21Ground connection, the resistance R21It is connected on the fortune Calculate amplifier U1BInverting input terminal and the operational amplifier U1BOutput end between, the operational amplifier U1BOutput End is through filter capacitor C1Ground connection, the operational amplifier U1BOutput end output amplification differential voltage U1；
The reversed summing circuit includes resistance R31, resistance R32, resistance R33, resistance R34And operational amplifier U2B, wherein amplification Differential voltage U1Through resistance R32It is input to the operational amplifier U2BInverting input terminal, meanwhile, system tolerant lower voltage limit Vref Pass through the resistance R31It is input to the operational amplifier U2BInverting input terminal, the operational amplifier U2BHomophase input End is through the resistance R34Ground connection, the resistance R33It is connected on the operational amplifier U2BInverting input terminal put with the operation Big device U2BOutput end between, the operational amplifier U2BOutput end pass through filter capacitor C2Ground connection, the operational amplifier U2BOutput end output amplification differential voltage U2；
Resistance R51With resistance R52It is composed in series bleeder circuit, the power flow includes NMOS switch pipe Q1With NMOS switch pipe Q2, wherein the NMOS switch pipe Q1Grid and the NMOS switch pipe Q2Grid be both connected to resistance R51With resistance R52 Between, resistance R51The other end connect the operational amplifier U2BOutput end, resistance R52The other end ground connection, the NMOS Switching tube Q1Source electrode and the NMOS switch pipe Q2Source electrode be connected, the NMOS switch pipe Q1Drain electrode connect electric current adjustment it is defeated Enter line W3, the NMOS switch pipe Q2Drain electrode connect electric current adjustment output line W4。
2. the equal balance system of batteries in parallel connection group according to claim 1, which is characterized in that further include clamp diode D1, described Clamp diode D1Cathode connect the operational amplifier U2BOutput end, the clamp diode D1Plus earth.
3. the equal balance system of batteries in parallel connection group according to claim 1, which is characterized in that
4. the equalization methods of the equal balance system of batteries in parallel connection group as described in claim 1, which comprises the steps of:
S1: the initial value that K is arranged is 1, starts to be controlled with first parallel branch；
S2: using parallel-current balanced unit PCBU to the branch current I of the K articles parallel branchKWith the K+1 articles parallel branch Branch current IK+1It is compared, works as IK< IK+1When, enter step S3；Otherwise parallel-current balanced unit PCBU is truncated the K articles The electric current of parallel branch, so that IK=0 and enter step S6；
S3: parallel-current balanced unit PCBU continue to compare whether IK+1-IK> Vref*R33/R32, if it is, S4 is entered step, Otherwise the electric current of the K articles parallel branch is truncated in parallel-current balanced unit PCBU, so that IK=0 and enter step S6；
The amplification differential voltage U of S4: parallel-current balanced unit PCBU output2It is gradually increased；
The branch current I of S5: the K articles parallel branchKIt is gradually increased；
S6: setting K=K+1 carries out next parallel branch in the way of step S2- step S5 under the conditions of meeting K≤n Control, until equilibrium terminates.
CN201710010191.3A 2017-01-06 2017-01-06 Batteries in parallel connection group equilibrium system and method Withdrawn - After Issue CN106786953B (en)

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CN109085506B (en) * 2018-07-31 2020-08-18 安徽优旦科技有限公司 Balanced failure detection control circuit and use method
KR102347920B1 (en) * 2018-10-12 2022-01-05 주식회사 엘지에너지솔루션 Apparatus and method for battery management
CN112271778A (en) * 2020-10-27 2021-01-26 深圳市驰普科达科技有限公司 Battery pack protection circuit and lithium battery system
CN112787373A (en) * 2020-12-30 2021-05-11 重庆峘能电动车科技有限公司 Battery pack charging and discharging method, circuit, system and equipment
CN115360800B (en) * 2022-10-20 2023-01-31 青岛鼎信通讯股份有限公司 Battery equalization circuit suitable for electric power product
CN115833359B (en) * 2022-12-16 2023-06-16 杭州师范大学附属医院(杭州市第二人民医院) Intelligent stable operation method of medical equipment

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CN102981482A (en) * 2012-11-29 2013-03-20 华为技术有限公司 Power supply circuit and method
CN104701913A (en) * 2013-12-09 2015-06-10 财团法人金属工业研究发展中心 Power supply device with current equalization function and battery module thereof

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