CN102522790A - Equalization device for series battery packs - Google Patents
Equalization device for series battery packs Download PDFInfo
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- CN102522790A CN102522790A CN2011103993328A CN201110399332A CN102522790A CN 102522790 A CN102522790 A CN 102522790A CN 2011103993328 A CN2011103993328 A CN 2011103993328A CN 201110399332 A CN201110399332 A CN 201110399332A CN 102522790 A CN102522790 A CN 102522790A
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- battery
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- energy
- equalization
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- 239000000178 monomer Substances 0.000 claims description 39
- 238000004804 winding Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
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Abstract
The invention belongs to the technical field of energy storage, and particularly relates to an equalization device for series battery packs. The device is used for equalization regulation and management between single energy-storage batteries and between battery packs. The device comprises at least one battery pack. The battery packs are connected in series to form the series battery packs. Each battery pack comprises at least two single batteries which are connected in series. The single battery comprises a battery and an equalization module. The two ends of the battery are connected in parallel with the equalization module. By the equalization device, point-to-point energy equalization between the battery packs and between the single batteries in each battery pack is realized, so that equalization speed is greatly increased, and equalization efficiency is greatly improved; and electrically isolated energy channels are formed between every two packs, so that a system can be adapted to many kinds of application from a low voltage grade to a high voltage grade, and has high universality, and a complex equalization strategy can be conveniently realized by a flexible hardware operating mode.
Description
Technical field
The invention belongs to the energy storage technology field, be specifically related to a kind of series battery balancer, the equilibrium that this device is used between energy-storage battery monomer and the battery pack is regulated and management.
Background technology
In the series battery; Battery cell is because performance and the useful life that the inconsistency of itself has reduced whole Battery pack; The capacity utilance of battery pack descends in the use, and overall performance (as: back cycle charge-discharge number of times discharges and recharges number of times less than monomer in groups) does not reach the cell index.For solving the inconsistent problem of series battery, battery management system is furnished with the balanced management circuit usually.
Existing balanced way mainly comprises energy consumption type equilibrium that utilizes the discharge resistance equilibrium and the non-energy consumption type balancer that is made up of electric capacity, inductance or transformer etc.The equilibrium of energy consumption type dissipates excess energy through resistance, and temperature rise is bigger, and efficient is low; Non-energy consumption type is balanced, and structure is complicated owing to comprise electronic components such as electric capacity, inductance, but its efficient is high, and energy loss is little.
The energy consumption type that utilizes resistance to realize is balanced, as shown in Figure 1.Battery cell two ends parallel discharge resistance and power switch pipe, through the monomer discharge higher to voltage of the break-make of control switch pipe, energy dissipates through the form of discharge resistance with heat.This balanced way is the simplest, but it can only be through giving the consistency of the highest battery cell discharge regulating cell of voltage, and balanced efficient is lower, and energy dissipation is serious, can not the realization group between equilibrium.
With electric capacity as energy-storage travelling wave tube to battery balanced, as shown in Figure 2.Adjacent monomer utilizes electric capacity as carrier of energy through the control of switch, can energy be transferred on the low monomer of voltage from the voltage high monomer, thus the equilibrium of monomer battery voltage in the realization battery pack.For N joint cell, need N power switch and N-1 energy electric capacity, thereby constitute switched capacitor network.But this balanced energy can only shift between adjacent monomer, and is balanced between can not the realization group, and energy loss is bigger in the capacitor charge and discharge process, and balanced efficient is lower.
The balancer that utilizes inductance element and fly-wheel diode to constitute, as shown in Figure 3.Each balance module is by a pair of power switch pipe, and an energy storage inductor and a pair of fly-wheel diode are formed.Each balance module two ends respectively connects a joint cell respectively, forms a non-isolated semi-bridge alternation device.When a certain monomer overcharges, its corresponding switch pipe conducting, energy storage is in by-pass inductor; When switching tube turn-offed, energy stored flowed to adjacent monomer, and each monomer energy is reached unanimity.But this balanced way switching loss is big, and energy can only directly shift at adjacent monomer, need not weigh Renewal Design to inductance when balanced between on the same group, and versatility is poor, and control is complicated.
The balancer that utilizes transformer to constitute, as shown in Figure 4, B1, B2 ... Bn is the storage battery of series connection, D1, and D2 ... Dn is the counnter attack diode, and S1 is a power switch pipe, and N is the n:1 transformer.This mode can be with the NE BY ENERGY TRANSFER of higher battery pack to more low-energy battery cell, and the voltage accurate and adjustable at monomer two ends.When system detects low-yield monomer, the conducting of transformer battery pack side power switch, former limit forms the loop through electric current, and energy storage is in transformer coil; When switch turn-offed, the transformer energy stored was discharged into battery cell, and the monomer that energy is low absorbs energy.But its distribution is complicated, and the module volume is bigger, between group when balanced transformer to bear voltage higher, need not weigh Renewal Design to inductance when balanced between on the same group, versatility is poor, influences the stability of system.
Because in energy-accumulating power station, the electric pressure of battery is higher, and battery not only branch mailbox is put, and what have also needs many Battery packs cabinet, and inconsistent between so different battery cabinets also will exert an influence to whole Battery pack performance.At present less to equalization scheme between group, can not satisfy the application need of voltage levels battery modules.
Summary of the invention
The objective of the invention is the pluses and minuses to existing balancer, in conjunction with the applied environment of energy-storage battery, the present invention provides a kind of series battery balancer.This balancer does not receive the restriction of Battery case or cabinet; Can between any two joint monomers, carry out energy and shift, energy is transferred to the low monomer of voltage from the high monomer of voltage, energy loss is little; Balanced efficient is high, can satisfy the balanced demand of high capacity cell.
The objective of the invention is to adopt following technical proposals to be achieved:
A kind of series battery balancer, its improvements are that said device comprises at least one battery pack; Connect between the said battery pack, be called series battery; Said battery pack comprises at least two monomers, connects between the said monomer; Said monomer comprises battery and balance module; The two ends parallel connection balance module of said battery.
A kind of optimized technical scheme provided by the invention is: said balance module comprises filter, power switch pipe and transformer; Said filter, power switch pipe and transformer are connected successively.
Second optimized technical scheme provided by the invention is: said balance module comprises diode, and said diode is connected between power switch pipe and the transformer.
The 3rd optimized technical scheme provided by the invention is: said filter comprises inductance L n-n and capacitor C n-n; Said power switch pipe comprises Tn-Am and Tn-Bm; Said diode comprises Dn-Am and Dn-Bm; Said inductance L n-n and capacitor C n-n series connection; Said inductance L n-n connects with power switch pipe Tn-Am; Said power switch pipe Tn-Bm is parallelly connected with diode Dn-Bm; Said diode Dn-Am and Dn-Bm all are connected on the winding of the former limit of transformer; Transformer secondary winding connects power tube Tn; Said power tube Tn connects battery pack; Said n and m are natural number, i.e. n=1,2,3...; M=1,2,3....
The 4th optimized technical scheme provided by the invention is: said transformer is based on the Technics of Power Electronic Conversion circuit and is with tapped high frequency transformer.
The 5th optimized technical scheme provided by the invention is: balanced in the realization group between the monomer of said battery pack inside; Balanced between the realization group between the said battery pack.
Compared with prior art, the beneficial effect that reaches of the present invention is:
1, series battery balancer provided by the invention; Through changing the energy Flow direction between each casing; Because have the passage of energy Flow between casing, battery can both can be accomplished point-to-point equilibrium in the casing, also can realize the point-to-point equilibrium between casing; Be that each casing can be operated in energy input and energy output state; And then make the energy balancing speed and transport efficient and improve greatly, realize the balance policy of whole bunch of battery easily, and can not cause the degree of association of balance policy high because of energy channel is dumb, complexity is strong;
2, series battery balancer provided by the invention; The energy channel that has electrical isolation between the formation group; The assurance system can adapt to the multiple application from the low-voltage grade to voltage levels; Possess good universal performance, rely on hardware effort mode flexibly, can realize complicated balance policy easily.
Description of drawings
Fig. 1 is the energy consumption type balancer sketch map that prior art utilizes resistance to realize,
Wherein: B1, B2 ... Bn is a storage battery, S1, and S2 ... Sn is a power switch pipe, R1, and R2 ... Rn is a power resistor;
Fig. 2 be prior art with electric capacity as energy-storage travelling wave tube to battery balanced device sketch map,
Wherein: B1, B2, B3 are storage battery, S1, S2, S3 are power switch pipe, C1, C2 are electric capacity;
Fig. 3 is the balancer sketch map that prior art utilizes inductance element and fly-wheel diode to constitute,
Wherein: B1, B2 ... Bn is a storage battery, S1, and S2 ... Sn is a power switch pipe, D1, and D2 ... Dn is the inverse parallel diode;
Fig. 4 is the balancer sketch map that prior art utilizes transformer to constitute,
Wherein: B1, B2 ... Bn is a storage battery, D1, and D2 ... Dn is a diode, and S1 is a power switch pipe, and N is the n:1 transformer;
Fig. 5 is the sketch map according to monomer circuit of the present invention;
Fig. 6 be according to balanced in of the present invention group be the sketch map of example with first case battery;
Fig. 7 is according to balanced with sketch map that first case and second case battery is an example between of the present invention group.
Embodiment
Do further detailed description below in conjunction with the accompanying drawing specific embodiments of the invention.
The present invention is based on the Technics of Power Electronic Conversion circuit and is with tapped high frequency transformer, and series battery balancer provided by the invention comprises N battery pack (N≤100); Connect between the said battery pack, be called series battery; Said battery pack comprises M monomer (number of M is decided according to engineering, is tens even more), connects between the said monomer; Said monomer comprises battery and balance module; The two ends parallel connection balance module of said battery, wherein battery is primarily aimed at ferric phosphate lithium cell and other various lithium ion batteries, is applicable to lead-acid battery and super capacitor group simultaneously.
Fig. 5 is the sketch map of monomer circuit of the present invention, and monomer comprises battery and balance module, balance module of battery two ends parallel connection, and balance module comprises filter circuit, power switch pipe, diode and transformer; Filter circuit is made up of inductance L 1-1 and capacitor C 1-1, wherein inductance and capacitances in series; Power switch pipe comprises T1-A1 and T1-B1; Diode comprises D1-A1 and D1-B1; Said inductance L is connected with power switch pipe T1-A1; Said power switch pipe T1-B1 is parallelly connected with diode D1-B1; Diode D1-A1 and D1-B1 all are connected on the winding of the former limit of transformer; Transformer secondary winding connects power tube T1; Power tube T1 connects battery pack; Wherein, T1-B1 works in the high frequency state, and T1-A1 works in normal open normal off state.
Equilibrium is example with first case battery in the group, and is as shown in Figure 6, supposes that the B1-1 monomer voltage is high, and the B1-3 monomer voltage is low, when balanced operation, and closed power switch transistor T 1-B1, closed power switch transistor T 1-A3 simultaneously; The power switch pipe of B1-1 monomer is operated in the HF switch state, and energy is sensed B1-3 through high frequency transformer N1, and this moment, the power switch pipe of B1-3 was operated in normally off.
Balancedly between group be example with first case and second case battery, as shown in Figure 7.Suppose that the B1-1 monomer voltage is high, the B2-1 monomer voltage is low, during equalizing circuit work; Closed power switch transistor T 1-B1; While closed power switch transistor T 2-A1, the energy of B1-1 is sensed high frequency transformer N1 secondary winding through the former limit winding of high frequency transformer; The high frequency transformer N2 parallelly connected with high frequency transformer N1 mends through the inductance rectification transformer former limit winding of energy-sensitive to the B2-1 monomer to B2-1.
Can find out that from Fig. 2 and Fig. 3 this kind balancer does not receive the restriction of Battery case, highly versatile can effectively solve the inconsistent problem between the casing; The control strategy simple and flexible only needs power tube the highest to monomer voltage and minimum battery to control simultaneously.
Series battery balancer provided by the invention adapts to the different voltages with different grade: such as the 300-500VDC grade that can be applicable to electric automobile, also can be applicable to the energy-accumulating power station grade of 800-1000VDC, low pressure also can be applied to stand-by power supply 48VDC grade.
Should be noted that at last: above embodiment is only in order to explanation the application's technical scheme but not to the restriction of its protection range; Although the application has been carried out detailed explanation with reference to the foregoing description; The those of ordinary skill in affiliated field is to be understood that: those skilled in the art still can carry out all changes, revise or be equal to replacement to the embodiment of application after reading the application; These changes, modification perhaps are equal to replacement, and it is all within the claim scope that its application is awaited the reply.
Claims (6)
1. a series battery balancer is characterized in that, said device comprises at least one battery pack; Connect between the said battery pack, be called series battery; Said battery pack comprises at least two monomers, connects between the said monomer; Said monomer comprises battery and balance module; The two ends parallel connection balance module of said battery.
2. series battery balancer as claimed in claim 1 is characterized in that said balance module comprises filter, power switch pipe and transformer; Said filter, power switch pipe and transformer are connected successively.
3. series battery balancer as claimed in claim 1 is characterized in that said balance module comprises diode, and said diode is connected between power switch pipe and the transformer.
4. like claim 2 and 3 each described series battery balancers, it is characterized in that said filter comprises inductance L n-n and capacitor C n-n; Said power switch pipe comprises Tn-Am and Tn-Bm; Said diode comprises Dn-Am and Dn-Bm; Said inductance L n-n and capacitor C n-n series connection; Said inductance L n-n connects with power switch pipe Tn-Am; Said power switch pipe Tn-Bm is parallelly connected with diode Dn-Bm; Said diode Dn-Am and Dn-Bm all are connected on the winding of the former limit of transformer; Transformer secondary winding connects power tube Tn; Said power tube Tn connects battery pack; Said n and m are natural number.
5. series battery balancer as claimed in claim 1 is characterized in that, said transformer is based on the Technics of Power Electronic Conversion circuit and is with tapped high frequency transformer.
6. series battery balancer as claimed in claim 1 is characterized in that, and is balanced in the realization group between the monomer of said battery pack inside; Balanced between the realization group between the said battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399332.8A CN102522790B (en) | 2011-12-05 | 2011-12-05 | Equalization device for series battery packs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399332.8A CN102522790B (en) | 2011-12-05 | 2011-12-05 | Equalization device for series battery packs |
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| Publication Number | Publication Date |
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| CN102522790A true CN102522790A (en) | 2012-06-27 |
| CN102522790B CN102522790B (en) | 2015-07-08 |
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| CN201110399332.8A Expired - Fee Related CN102522790B (en) | 2011-12-05 | 2011-12-05 | Equalization device for series battery packs |
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| CN102856976A (en) * | 2012-09-25 | 2013-01-02 | 广东易事特电源股份有限公司 | Discontinuous power supply, battery management system and discontinuous power supply system |
| CN103457325A (en) * | 2013-09-05 | 2013-12-18 | 江苏常隆客车有限公司 | Direct-type lithium ion battery lossless equilibration circuit and equilibration control method |
| CN103647329A (en) * | 2013-12-24 | 2014-03-19 | 湖北工业大学 | Two-stage equalizing charging system and application thereof |
| CN103972596A (en) * | 2014-05-09 | 2014-08-06 | 扬州大学 | Renewable energy integrated storage battery maintenance device and maintenance method thereof |
| CN104201732A (en) * | 2014-08-12 | 2014-12-10 | 华南理工大学 | Bi-directional charging-discharging equalization circuit with series connection battery pack consisting of four battery modules |
| CN104967172A (en) * | 2015-07-07 | 2015-10-07 | 厦门乾芯能源科技有限公司 | Battery pack active balancing control system |
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| CN113659679A (en) * | 2021-08-18 | 2021-11-16 | 傲普(上海)新能源有限公司 | Battery equalization circuit |
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| CN113872288B (en) * | 2021-09-28 | 2023-07-18 | 傲普(上海)新能源有限公司 | Voltage balancing circuit and method for battery cells in battery module |
| CN114362305A (en) * | 2021-12-31 | 2022-04-15 | 傲普(上海)新能源有限公司 | Series battery module equalizing circuit and method |
| CN115864606A (en) * | 2023-02-16 | 2023-03-28 | 杭州协能科技股份有限公司 | Active equalization circuit and control method thereof |
| CN115864606B (en) * | 2023-02-16 | 2023-05-26 | 杭州协能科技股份有限公司 | Active equalization circuit and control method thereof |
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