CN209313474U - Inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit - Google Patents
Inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit Download PDFInfo
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- CN209313474U CN209313474U CN201920066573.2U CN201920066573U CN209313474U CN 209313474 U CN209313474 U CN 209313474U CN 201920066573 U CN201920066573 U CN 201920066573U CN 209313474 U CN209313474 U CN 209313474U
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Abstract
The utility model relates to lithium battery balancing technique fields, it is based especially on the inverse-excitation type multichannel equalizing circuit of Buck_Boost unit, equilibrium topology is sequentially connected in series series-connected cell group by n battery cell, the input terminal of series-connected cell group connection transformer, transformer output one storage capacitor of termination, storage capacitor both ends are separately connected the input terminal of Buck_Boost unit, and each battery cell is separately connected a Buck_Boost unit output end.The topology charges to storage capacitor by transformer, the interim storage energy of capacitor, again by controlling the switching tube in each Buck_Boost unit, energy in capacitor is assigned to by Buck_Boost unit and needs balanced battery cell, by periodically feeding back battery pack power to battery cell, realize to the whole balanced of battery pack.The discharge loop of the utility model battery pack passes through each battery cell, and capacitor can discharge simultaneously to battery cell multichannel, has many advantages, such as that balancing speed is fast, energy loss is small.
Description
Technical field
The utility model relates to lithium battery balancing technique field, especially a kind of inverse-excitation type based on Buck_Boost unit
Multichannel equalizing circuit.
Background technique
The environmental problem and economic problems got worse promotes Zhe Ge state all in the exploitation for actively promoting clean energy resource, simultaneously
Also develop towards cleaning, efficiently with the direction of sustainable development in terms of urban transportation, lithium battery is with energy density height, volume
Small, memory-less effect, the advantages that having extended cycle life have been widely used in pure electric automobile and mixed power electric car.By
It is lower in single lithium battery voltage, in order to realize the application in high pressure occasion, it usually needs many lithium batteries are monomer series-connected
Get up to reach high voltage output.But there are some differences in terms of production technology for lithium battery, lead to the monomer internal resistance of cell,
Energy is stored, the parameters such as operating ambient temperature are inconsistent, therefore battery pack can be existing with over-discharge in the presence of overcharging in charge and discharge process
As, efficiency, the capacity of battery are not only reduced in this way, it is more serious to shorten battery life so that the danger that can be exploded
Danger.Therefore a kind of battery equalizing circuit is studied to guarantee the voltage consensus of battery during the work time, to improve battery
Working efficiency and extension battery life are of great significance.
Currently, researcher is it is proposed that many equalizing circuits topology excessively, classifies according to topological structure, it can be by these equilibriums
Circuit is divided into two major classes: centralized equalizing circuit and distributed equalizing circuit.Centralized equalizing circuit refers to that entire battery pack is total
With a balanced device, energy is re-assigned to each battery cell by technologies such as converter partial pressures, it is final to realize that energy exists
A kind of balanced way transmitted between battery cell and battery pack.Distributed equalizing circuit then refers to that each battery cell is equipped with one
A balanced device is worked by each balanced device to realize the equilibrium between battery cell.From an energy point of view, equalizing circuit again may be used
It is divided into dissipative equalization and nondissipative equalization.Dissipative equalization refers to the resistance consumption by each battery cell both ends parallel connection
Fall extra energy to achieve the purpose that equilibrium, this method is also the scheme put forward earliest, but since there are a large amount of energy for it
Amount consumption and extra heat can be generated, can equalization efficiency be substantially reduced, thus nondissipative equalization circuit become grind
The main flow direction studied carefully.Nondissipative equalization circuit refers to that, by inductance, capacitor, the energy-storage travelling wave tubes such as transformer will be in high-voltage battery
Energy transfer into low-voltage battery, in the loss of the few energy of balancing procedure, and equalization efficiency with higher.But
It is traditional Buck_Boost equalizing circuit method, selects to need two balanced batteries by switch, it will be in high-voltage battery
Energy transfer into the battery of low-voltage, realize the transmitting of energy, however this method every time can only be between two batteries
The transmitting of energy is carried out, therefore can there is a problem of that balancing speed is slower.Equalizing circuit based on multiwinding transformer, pass through by
The energy of battery pack is transmitted to secondary side Multiple coil output end from transformer primary side, transfers energy to needs by Multiple coil output
Balanced battery cell, this equalization methods fast speed, but to reach balanced, it is necessary to assure vice-side winding parameter complete one
It causes, but it is completely the same to be difficult to realize parameter since there are cross influences between each winding in practice, so greatly limitation
Such application of topology in practice.
Utility model content
In view of the above technical problems, it is equal to provide a kind of inverse-excitation type multichannel based on Buck_Boost unit for the utility model
Weigh circuit, had not only solved the problems, such as that traditional Buck_Boost balancing speed was slow, but also solves multiwinding transformer output end intersection
The problem of influence.
The technical solution adopted in the utility model is:
A kind of inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit, including n battery cell, a flyback become
Depressor, a storage capacitor C1, n Buck_Boost unit；Each battery cell is separately connected a Buck_Boost unit
Output end；N Buck_Boost unit is mutually in parallel, input terminal and storage capacitor C after parallel connection1Connection；Buck_Boost
The output end of unit is separately connected a battery cell；
N battery cell is connected into battery pack；Series-connected cell group connects flyback transformer primary side, and flyback transformer pair side connects
Storage capacitor C1；Charging control switch pipe S is connected between flyback transformer and battery packQ；
The Buck_Boost unit includes two switching tubes, three diodes, an inductance；One of switching tube
Resonant tank, another switching tube and another diode and battery are constituted with inductance, capacitor respectively with two diodes
Monomer constitutes discharge loop.
The control method of equalizing circuit topology, including following procedure: by releasing energy to battery pack, then by the part
The battery cell of energy transfer low energy into battery pack, thus the equilibrium between realizing battery cell；Detailed process is as follows: first controlling
Flyback transformer primary side switch pipe conducting processed, battery pack power is transmitted in secondary side output capacitance by flyback transformer, so
Control the corresponding Buck_Boost unit input end switch pipe conducting of low energy battery cell again afterwards, capacitor occurs humorous with inductance
Vibration, the energy in capacitor is assigned in each inductance, finally controls the conducting of Buck_Boost unit output end switching tube again, will
Energy transfer in inductance is into battery cell, to realize the process that energy is transmitted from battery pack to battery cell multichannel.
Compared with prior art, the utility model has the beneficial effects that
(1) compared with existing multiwinding transformer equilibrium topology, the utility model only includes a transformer, and defeated
Outlet connects n Buck_Boost unit, is controlled between each unit independently of each other, there is no multiwinding transformer export winding it
Between cross one another the problem of influencing, and have small in size, control simple advantage.
(2) the utility model battery power discharge circuit flows through entire battery pack, and the battery cell of different location has identical
Balancing speed, avoid the voltage as caused by battery cell balancing speed is inconsistent and interlock phenomenon, reduce energy loss.
(3) the utility model Buck_Boost unit increases a switching tube on the basis of original circuit, and two two
Pole pipe guarantees that each mode is mutually indepedent, avoiding the problem that crossing one another influences to limit current path.
(4) it can realize that multichannel is balanced simultaneously when the utility model shifts the energy of battery pack to low energy battery cell,
To improve balancing speed.
Detailed description of the invention
Fig. 1 is the inverse-excitation type multichannel equalizing circuit structure chart based on Buck_Boost unit of the utility model.
Fig. 2 is embodiment with B in four battery packs3、B4Circuit working timing figure for charging.
Fig. 3 is operation mode 1 circuit diagram of the embodiment by taking 4 battery packs as an example in one cycle.
Fig. 4 is operation mode 2 circuit diagram of the embodiment by taking 4 battery packs as an example in one cycle.
Fig. 5 is operation mode 3 circuit diagram of the embodiment by taking 4 battery packs as an example in one cycle.
Fig. 6 is operation mode 4 circuit diagram of the embodiment by taking 4 battery packs as an example in one cycle.
Fig. 7 a is equivalent circuit diagram of the implementation example figure 1 under 1 state of mode.
Fig. 7 b is equivalent circuit diagram of the implementation example figure 1 under 2 state of mode.
Fig. 7 c is equivalent circuit diagram of the implementation example figure 1 under 3 state of mode.
Fig. 7 d is equivalent circuit diagram of the implementation example figure 1 under 4 state of mode.
Fig. 8 is magnetizing inductance L of the implementation example figure 1 under 2 state of modemWith capacitor C1Charge-discharge wave shape.
Fig. 9 is capacitor C of the implementation example figure 1 under 3 state of mode1With inductance L Charge-discharge wave shape.
Figure 10 is embodiment equalizing circuit topology control flow chart.
Figure 11 is the crucial simulation waveform of embodiment equalizing circuit topology.
Figure 12 is 4 battery of embodiment series connection battery pack balancing simulation waveform.
Figure 13 is 6 battery of embodiment series connection battery pack balancing simulation waveform.
Figure 14 is the balanced simulation waveform of balanced topological 4 battery packs in charging mode of embodiment.
Figure 15 is the balanced simulation waveform of balanced topological 4 battery packs in discharge mode of embodiment.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit, including n battery cell
B1、B2……Bn, a flyback transformer, a storage capacitor C1, n Buck_Boost unit；Each battery cell connects respectively
Connect the output end of a Buck_Boost unit；N Buck_Boost unit is mutually in parallel, input terminal and energy storage electricity after parallel connection
Hold C1Connection；The output end of Buck_Boost unit is separately connected a battery cell；
N battery cell is connected into battery pack；Series-connected cell group connects flyback transformer primary side, and flyback transformer pair side connects
Storage capacitor C1；Charging control switch pipe S is connected between flyback transformer and battery packQ；
The Buck_Boost unit includes two switching tubes, three diodes, an inductance；One of switching tube
Resonant tank, another switching tube and another diode and battery are constituted with inductance, capacitor respectively with two diodes
Monomer constitutes discharge loop.
The control method of equalizing circuit topology, including following procedure: when a cycle starts, charge control is first controlled
Switching tube SQConducting, battery pack are then powered off charging control switch pipe S to transformer primary side magnetizing inductance energy storageQ, primary side at this time
Energy in magnetizing inductance will be discharged into secondary side capacitor C by transformer coupled1In, the battery (m) of low energy is then connected
Corresponding Buck_Boost unit input end switch pipe S2i-1, capacitor C at this time1With m inductance LiResonance, the energy in capacitor will
It is assigned to each inductance LiIn, as capacitor C1In energy release finish, on-off switching tube S2i-1And at the same time conducting switching tube
S2i, inductance LiIn energy will be discharged into battery cell respectively, discharge so as to complete from battery pack to multiple battery cells
Process.
Further citing is as shown in Fig. 2, there is 4 battery cell tandem compounds, wherein VB1> VB2> Vav> VB3> VB4,
In order to realize equilibrium, then need B1、B2In energy transfer to B3、B4In.It, can will be equalized within a duty cycle
Journey is divided into 4 operation modes.
Fig. 3 to Fig. 6 gives the current path under each mode.
As shown in figure 3,1 [t of mode0-t1]: in t0Moment, controller detect battery B3、B4Voltage is lower than average voltage,
Charging control switch pipe SQConducting, series-connected cell group store energy to transformer primary side magnetizing inductance, and excitation inductance current is linear
Rise, until t1Moment, charging control switch pipe SQShutdown.
As shown in figure 4,2 [t of mode1-t2]: t1Moment, on-off switching tube SQShutdown, flyback transformer primary side starts at this time
Energy, excitation inductance current decline, capacitor C are transmitted to secondary side1Voltage is gradually increasing, t2Moment, inductive current fall to zero, electricity
Hold voltage and reach maximum value, due to diode DQBack clamping effect, capacitor no longer releases energy, at this time without energy in circuit
Amount flowing.
As shown in figure 5,3 [t of mode2-t3]: t2Moment, switching tube S5、S7Conducting, capacitor C1With inductance L3、L4Parallel resonance,
Energy in capacitor is shifted to inductance, when capacitance voltage falls to zero, switching tube S5、S7Shutdown, the energy in capacitor is complete at this time
Portion is transferred in inductance.
As shown in fig. 6,4 [t of mode3-t4]: t3Moment, switching tube S6、S8Conducting, inductance L3、L4In energy respectively to electricity
Pond B3、B4Middle release, inductive current linear decline is up to being reduced to zero, switching tube S6、S8Shutdown.
The equalizing circuit constantly repeats the above process, and can be realized B1、B2In energy constantly to B3、B4Middle transfer.
The each cell voltage of detection, makes comparisons with battery pack average voltage respectively before each period starts, and carries out above-mentioned same process,
Battery B finally can be realized1~B4Equilibrium.
It can be obtained by analysis, when circuit work is in stable state, each period can have energy to feed back from battery pack
Return the battery cell of low-voltage.Equivalent circuit in each mode is respectively as shown in Fig. 7 a, Fig. 7 b, Fig. 7 c, Fig. 7 d.If charging
Control switch pipe SQThe time of conducting is α Ts, then the energy that battery pack discharges in a cycle is W=(VallαTs)2/2Lm；Mode
In 2, the energy stored in capacitor is W, and 2 duration of mode is Δ T1=π √ (LmC1)/2, Fig. 8 gives inductance LmAnd electricity
Hold C1Charge-discharge wave shape；In mode 3, capacitor C1With m inductance LiResonance, the energy in capacitor will be assigned to m electricity at this time
Feel LiIn, WLi=(VallαTs)2/2mLm, 3 duration of Δ T of mode2=π √ (LC1/ m)/2, Fig. 9 gives capacitor C1With m
Inductance LiThe Charge-discharge wave shape of resonance.In mode 4, inductance LiIn energy transfer into the battery cell of low energy, so i.e.
Complete the process that a cycle self-energy is shifted from battery pack to battery cell.
According to above-mentioned analysis, Figure 10 gives the control flow chart of the equalizing circuit.I.e. when a cycle starts, first examine
Each cell voltage is surveyed, the average voltage V of battery pack is calculatedavBattery number m with average voltage is lower than, then carries out above-mentioned
The process that energy is shifted from battery pack to battery cell can be realized repeatedly in four kinds of mode in each period, final to realize
The equilibrium of battery pack.
Analysis of simulation result:
For this circuit, simulation analysis is carried out, simulation parameter is respectively as follows: magnetizing inductance Lm=100 μ H, capacitor C1=
10 μ F, inductance L=250 μ H, switching frequency f=5kHZ.Under this group of simulation parameter, 4 battery packs and 6 battery packs have been carried out respectively
Balanced emulation, and be charged and discharged balanced.
Figure 11 is the magnetizing inductance L in simulation processm, capacitor C1With the waveform of inductance L.
Figure 12 is simulation waveform of 4 battery packs in standing, and Figure 13 is emulation wave of 6 battery packs in standing
Shape, it can be seen from simulation result in the case where initial voltage of battery is inconsistent, equalizing circuit that the utility model is proposed
Can be realized the electric voltage equalization of each battery cell, and increasing with number of batteries, can not only fast implement it is balanced and
It does not have much affect to balancing speed.
Figure 14 show the balanced simulation waveform of equilibrium topology 4 battery packs in charging mode, charging current 0.1A,
By in figure it is found that when battery work in charging mode, the utility model proposes balanced topology can fast implement each battery
The electric voltage equalization of monomer.
Figure 15 show the balanced simulation waveform of topological 4 battery packs in discharge mode of the equilibrium, discharge resistance 150
Ω, You Tuzhong it is found that when battery work in discharge mode, the utility model proposes balanced topology can fast implement each electricity
The electric voltage equalization of pond monomer.
In conclusion a kind of inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit that the utility model is proposed
Have the characteristics that balancing speed is fast, equalization efficiency is high, energy loss is small, no matter working in charging, electric discharge or static condition,
The equilibrium of battery cell can be fast implemented, and equilibrium may be implemented to the battery cell of any number of batteries.
Claims (2)
1. the inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit, which is characterized in that including n battery cell, one
Flyback transformer, a storage capacitor, n Buck_Boost unit；Each battery cell is separately connected a Buck_Boost
The output end of unit；N Buck_Boost unit is mutually in parallel, and the input terminal after parallel connection is connect with storage capacitor；Buck_
The output end of Boost unit is separately connected a battery cell；
N battery cell is connected into battery pack；Series-connected cell group connects flyback transformer primary side, and flyback transformer pair side connects energy storage
Capacitor；Charging control switch pipe is connected between flyback transformer and battery pack.
2. the inverse-excitation type multichannel equalizing circuit according to claim 1 based on Buck_Boost unit, which is characterized in that institute
The Buck_Boost unit stated includes two switching tubes, three diodes, an inductance；One of switching tube and two two poles
Pipe constitutes resonant tank, another switching tube and another diode with inductance, capacitor respectively and puts with battery cell composition
Electrical circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920066573.2U CN209313474U (en) | 2019-01-16 | 2019-01-16 | Inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit |
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| CN201920066573.2U CN209313474U (en) | 2019-01-16 | 2019-01-16 | Inverse-excitation type multichannel equalizing circuit based on Buck_Boost unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672246A (en) * | 2019-01-16 | 2019-04-23 | 西南交通大学 | Inverse-excitation type multichannel equalizing circuit and its control method based on Buck_Boost unit |
| CN110380493A (en) * | 2019-08-29 | 2019-10-25 | 西南交通大学 | A kind of serial lithium battery equalizer circuit |
| CN111585433A (en) * | 2020-05-07 | 2020-08-25 | 国网重庆市电力公司电力科学研究院 | Universal interface, control method and energy storage system |
| CN112952974A (en) * | 2021-03-10 | 2021-06-11 | 华南理工大学 | Hybrid energy storage equalization circuit based on forward and backward flyback converter and control method |
-
2019
- 2019-01-16 CN CN201920066573.2U patent/CN209313474U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672246A (en) * | 2019-01-16 | 2019-04-23 | 西南交通大学 | Inverse-excitation type multichannel equalizing circuit and its control method based on Buck_Boost unit |
| CN109672246B (en) * | 2019-01-16 | 2024-01-19 | 西南交通大学 | Flyback multi-path equalizing circuit based on Buck_boost unit and control method thereof |
| CN110380493A (en) * | 2019-08-29 | 2019-10-25 | 西南交通大学 | A kind of serial lithium battery equalizer circuit |
| CN111585433A (en) * | 2020-05-07 | 2020-08-25 | 国网重庆市电力公司电力科学研究院 | Universal interface, control method and energy storage system |
| CN111585433B (en) * | 2020-05-07 | 2022-02-11 | 国网重庆市电力公司电力科学研究院 | Universal interface, control method and energy storage system |
| CN112952974A (en) * | 2021-03-10 | 2021-06-11 | 华南理工大学 | Hybrid energy storage equalization circuit based on forward and backward flyback converter and control method |
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Granted publication date: 20190827 Termination date: 20220116 |