CN202856422U - Bidirectional electrical energy transfer circuit - Google Patents
Bidirectional electrical energy transfer circuit Download PDFInfo
- Publication number
- CN202856422U CN202856422U CN 201220572802 CN201220572802U CN202856422U CN 202856422 U CN202856422 U CN 202856422U CN 201220572802 CN201220572802 CN 201220572802 CN 201220572802 U CN201220572802 U CN 201220572802U CN 202856422 U CN202856422 U CN 202856422U
- Authority
- CN
- China
- Prior art keywords
- battery unit
- battery
- circuit
- electrical energy
- energy storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a bidirectional electrical energy transfer circuit, relates to an electrical energy transfer circuit used for equalizing the power of a serial battery pack, and pertains to the technical field of battery pack equalization circuits. The technical problem to be solved is to overcome defects of large number of switch devices, complex drive control and high cost with a direct-current buck-boost circuit in the prior art. The bidirectional electrical energy transfer circuit is characterized in that the positive electrode and the negative electrode of a battery unit in a series battery pack are connected with the positive electrode of a direct-current bus and the negative electrode of the direct-current bus respectively through two switch devices, two energy storage inductors and two blocking capacitors. By controlling the switch-on and switch-off timing sequence of a corresponding switch device, the buck-boost operation of the battery unit can be realized, and the output and input control of the electrical energy of the battery unit can be realized, so that the electrical energy transfer and equalization control of battery units in series battery packs having different number of battery units can be realized. According to the utility model, the buck-boost ratio and the electrical energy transfer direction can be controlled flexibly, the modules work independently, and advantages of simple structure, low cost, high efficiency and good reliability can be realized.
Description
Technical field
The utility model belongs to the circuit of battery pack balancing technical field, is specifically related to a kind of electric energy transfer circuit for the series battery electric quantity balancing, particularly the equalizing circuit of the non-energy consumption Real-time Equalization Algorithm of power battery pack.
Background technology
Along with the application of large capacity density, high power density storage battery is more and more general, the balancing technique of battery pack becomes the main task of battery management system.Use at present maximum lead acid accumulator, nickel-hydrogen accumulator and lithium-ions battery, because the difference of production process, all there are the inconsistent phenomenon between the element cell that can't eliminate fully in the performance change of use procedure and some other factor.When battery pack is applied to picture motor vehicle etc. and needs the occasion of frequent charge and discharge cycles, in order to obtain enough system voltages, need to improve supply power voltage by the series connection of battery pack.Unbalanced between the battery unit that is connected in series can reduce the available capacity of whole battery pack, can only be put into the lower limit of the battery unit of capacity minimum during discharge, otherwise polarity inversion can appear in the battery unit of capacity minimum.During serial connection charge, the battery of cell capability minimum at first is full of in the battery pack.If stop charging this moment, then whole battery pack can't be full of, and the capacity of battery pack can not be utilized effectively; If continue to charge to the state-of-charge (SOC) of battery of all battery units to 100 %, then overcharging can appear in the part battery unit.Although lead acid accumulator can allow overcharging of certain limit, certainly leads to energy dissipation, reduce charge efficiency.Lithium ion battery does not allow to overcharge, so battery pack is balanced even more important.
At present, the equilibrium of series-connected batteries mainly is divided into energy consumption method and non-energy consumption method.The energy consumption method is that the electric weight of battery unit that electric weight is high converts heat exhaustion to by resistance and falls, and reaches the purpose of battery pack balancing.This method is simple in structure, cost is low, and is more at low capacity, lower powered applications.But in the balanced occasion of large-capacity battery pack, when producing amount of heat when balanced, can reduce the charge efficiency of battery pack.The kind of non-energy consumption formula equilibrium is more, and its operation principle is with the electric charge of electric weight battery unit how, transfers on the dc bus of the low unit of electric weight or battery pack.Because the circuit design requirement of large capacity series battery, the series relationship of battery circuit generally can not change.The electric weight of battery unit shifts the general two kinds of methods that adopt: the one, the isolating transformer method, by isolated form DC/DC module, the voltage step-down of battery pack dc bus pumped into battery unit or the electric energy of battery unit boosted after pump into the battery pack dc bus; The 2nd, shift step by step by the electric quantity balancing circuit between battery unit.The major defect of isolating transformer method is that electrical energy transfer efficient is low, and the circuit elements device is many, and module is complicated, and cost is high, and reliability is low.The shortcoming of transfer method is that the electric energy conversion times is many step by step, and energy loss is large, and balanced efficient is low.Because electric energy is to transmit step by step, if a module breaks down, then the portfolio effect of whole system can significantly reduce the poor reliability of system simultaneously.
Summary of the invention
The purpose of this utility model is: the defective that overcomes circuit balanced between the prior art series battery battery unit, take full advantage of the inductive energy storage principle of boosting, improve traditional Boost DC voltage booster circuit and Buck direct-current voltage reducing circuit, provide a kind of structure more simple, high efficiency, bidirectional electric energy carry circuit cheaply, with realize large capacity series battery efficiently, reliably, cheaply balanced management.For achieving the above object, the technical scheme that adopts is: a kind of bidirectional electric energy carry circuit, comprise dc bus, battery unit, switching device, energy storage inductor and isolation capacitance, it is characterized in that: the positive pole of battery unit Bl connects the end of the first energy storage inductor L1, the other end of described the first energy storage inductor L1 connects the end of the first isolation capacitance C1 and the end of the first switching device SW1, and the other end of described the first switching device SW1 connects the negative pole of battery unit Bl and the end of the second isolation capacitance C2; The end that the other end of described the first isolation capacitance C1 connects the second energy storage inductor L2 is connected an end with second switch device SW2: it is anodal that the other end of described second switch device SW2 connects dc bus; The other end of described the second isolation capacitance C2 connects the other end and the dc bus negative pole of the second energy storage inductor L2; The state of the first switching device SW1, second switch device SW2 is controlled by control circuit U1.
Described control circuit U1 is connected with the control end of the first switching device SW1, second switch device SW2 respectively by drive circuit, and the signal deteching circuit two ends of control circuit Ul are connected with negative pole with the positive pole of battery unit Bl respectively; Control circuit sends control signal, and the hocket cycling of turn-on and turn-off of the first switching device SW1, second switch device SW2 realizes the non-energy consumption balance of battery pack.
During battery unit output electric energy, when at first the first switching device SW1 is in conducting state under the effect of control circuit, when second switch device SW2 is in off state, the voltage of battery unit is applied to the two ends of the first energy storage inductor L1, and with the residual current of the first energy storage inductor L1 in the same way.The flow circuits of direct current is: battery unit positive pole → the first energy storage inductor L1 → the first switching device SW1 → battery unit negative pole.The electric current of the first energy storage inductor L1 increases, and this stage is the energy storage stage.Simultaneously, the first isolation capacitance C1, the first switching device SW1, the second isolation capacitance C2, the second energy storage inductor L2 consist of the another one current circuit.By the current flowing in this loop, the first isolation capacitance C1 and the second isolation capacitance C2 transfer to the energy of position that stores among the second energy storage inductor L2, for the electric energy output of next stage is prepared.The first switching device SW1 is in off state under the effect of control circuit, when second switch device SW2 was in conducting state simultaneously, the first energy storage inductor L1 transferred in the dc bus by the loop that the first isolation capacitance C1, second switch device SW2, dc bus positive pole, dc bus negative pole, the second isolation capacitance C2 consist of at the electric energy that stores on last stage.The sense of current in this loop is: battery unit positive pole → the first energy storage inductor L1 → the first isolation capacitance C1 → second switch device SW2 → dc bus positive pole → dc bus negative pole → the second isolation capacitance C2 → battery unit negative pole.Simultaneously, the electric energy that stores among the second energy storage inductor L2 is also transferred in the dc bus, and the sense of current in this loop is: the second energy storage inductor L2 → second switch device SW2 → dc bus positive pole → dc bus negative pole → the second energy storage inductor L2.Above-mentioned one-period operation for battery unit output electric energy.Control circuit Ul repeats aforesaid operations by the time scale of control the first switching device SW1 and second switch device SW2 turn-on and turn-off by the frequency of setting, power that can corresponding control battery unit output electric energy.
During battery unit input electric energy, when at first second switch device SW2 is in conducting state under the effect of control circuit, when the first switching device SW1 is in off state, DC bus-bar voltage is applied to the two ends of the first energy storage inductor L1 and the second energy storage inductor L2, and with the residual current of the first energy storage inductor L1 in the same way.Current circuit by the first energy storage inductor L1 is: dc bus positive pole → second switch device SW2 → the first isolation capacitance C1 → the first energy storage inductor L1 → battery unit positive pole → battery unit negative pole → the second isolation capacitance C2 → dc bus negative pole.The first energy storage inductor L1 is in the energy storage stage.Simultaneously, the current circuit by the second energy storage inductor L2 is: dc bus positive pole → second switch device SW2 → the second energy storage inductor L2 → dc bus negative pole.The second energy storage inductor L2 is in the energy storage stage.Through setting-up time, second switch device SW2 is in off state under the effect of control circuit, the first switching device SW1 is in conducting state, and the circuit loop by the first energy storage inductor L1 becomes: the first energy storage inductor L1 → battery unit positive pole → battery unit negative pole → the first switching device SW1 → the first energy storage inductor L1.The electric energy that stores among the first energy storage inductor L1 is input to battery unit.Simultaneously, the circuit loop by the second energy storage inductor L2 is: the second energy storage inductor L2 → the second isolation capacitance C2 → the first switching device SW1 → the first isolation capacitance C1 → the second energy storage inductor L2.In electric energy transfer to two isolation capacitance among the second energy storage inductor L2, and the state of recovery isolation capacitance, for next one circulation is prepared.Above-mentioned one-period operation for battery unit input electric energy.Control circuit (Ul) repeats aforesaid operations by the time scale of control the first switching device SW1 and second switch device SW2 turn-on and turn-off by the frequency of setting, power that can corresponding control battery unit input electric energy.
The balanced detection method of control circuit by designing in advance, judge the equilibrium state of battery unit and send control signal, operate according to foregoing electric energy output or input principle through overdrive circuit control switch device, then the unnecessary electric weight of battery unit is constantly transferred in the dc bus by corresponding with it electric energy output circuit.Or the electric energy of dc bus is input to battery unit, and the electric energy of battery unit is replenished separately, two kinds of operations realize the non-energy consumption balance of battery pack in conjunction with utilization.
Relatively existing other electric energy transfer modes of the utility model have following advantage:
1. efficient is high.The utility model only adopts two switching devices to control, and realizes the isolation of electric capacity between battery unit output and the input circuit, has further improved the energy transfer efficiency of circuit, the reliability of Effective Raise circuit and fail safe.
2. simple in structure, cost is low.A kind of bidirectional electric energy carry circuit disclosed in the utility model does not need the conversion of direct current and alternating current, only needs six components and parts on the principle, and simple in structure, cost reduces greatly.
3. realize simultaneously output and the input operation of battery unit electric energy, the balanced efficient of batteries management system is high, both can realize charge balancing, can realize equalization discharge again.
4. reliability is high.When the utility model is applied to the balanced management of battery pack electric energy, the corresponding bidirectional electric energy carry circuit of each battery unit, module works alone, and any breaks down, and can not affect the function of other unit, has improved the reliability of whole system.
5. can realize standardization, mass production.Electric energy transfer direction of the present utility model and power control are flexibly.Same circuit can adapt to the battery pack of different series connection progression, is conducive to reduce cost, makes things convenient for system maintenance.
Description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the utility model theory diagram;
Fig. 2 is series battery electric quantity equalizing system bidirectional electric energy carry circuit theory diagram.
Embodiment
Fig. 1 is the utility model theory diagram.Illustrate a kind of bidirectional electric energy carry circuit, comprise dc bus, battery unit, switching device, energy storage inductor and isolation capacitance, it is characterized in that: the positive pole of battery unit Bl connects the end of the first energy storage inductor L1, the other end of described the first energy storage inductor L1 connects the end of the first isolation capacitance C1 and the end of the first switching device SW1, and the other end of described the first switching device SW1 connects the negative pole of battery unit Bl and the end of the second isolation capacitance C2; The end that the other end of described the first isolation capacitance C1 connects the second energy storage inductor L2 is connected an end with second switch device SW2: it is anodal that the other end of described second switch device SW2 connects dc bus; The other end of described the second isolation capacitance C2 connects the other end and the dc bus negative pole of the second energy storage inductor L2; The state of the first switching device SW1, second switch device SW2 is controlled by control circuit U1.
Described control circuit U1 is connected with the control end of the first switching device SW1, second switch device SW2 respectively by drive circuit, and the signal deteching circuit two ends of control circuit Ul are connected with negative pole with the positive pole of battery unit Bl respectively; Control circuit sends control signal, and the hocket cycling of turn-on and turn-off of the first switching device SW1, second switch device SW2 realizes the non-energy consumption balance of battery pack.
The utility model is applied to three joint managing equalization of series battery as example, the bidirectional electric energy carry circuit is implemented theory diagram shown in Fig. 2, take battery unit Bl as example, has indicated in detail connecting circuit among the figure.Each bidirectional electric energy carry circuit and a cover control circuit consist of an independently balanced management module, each battery unit connects a described administration module, connect by communication bus between each described administration module, each module can be by the information of other modules in the communication bus reading system.The first switching device SW1, second switch device SW2 preferably adopt MOSFET or IGBT device.Device select the consistency that does not change on the utility model principle.The control circuit U1 of balanced management module is connected with the control end of the first switching device SW1, second switch device SW2 respectively by drive circuit.Control circuit Ul is connected with negative pole with the positive pole of battery unit B1 by signal deteching circuit.Each control module will send to other modules with the information that oneself connects battery unit by communication bus, and read the information of other battery units by communication bus, control circuit is judged the equilibrium state of battery unit by predefined balanced detection method.Be attached thereto when detecting that the battery unit that connects need to be exported or when inputting electric energy, control circuit sends control signal.Above-mentioned control signal is controlled the first switching device SW1, second switch device SW2 through overdrive circuit and is carried out the cycling of turn-on and turn-off according to foregoing output electric energy, input electric energy principle.The transfer power of the Duty ratio control electric weight of switching device and input, output voltage ratio.Switching device does not also require absolute synchronous turn-on and turn-off control, and actual circuit can not be realized absolute synchronization.But the whether synchronous consistency of the utility model on the electric energy transfer principle that do not affect.Battery unit B1 is not limited to battery cell in the present embodiment, and for multi-stage superimposed topological structure, battery unit B1 can be the battery pack that integrates.
Although the utility model is described in detail in conjunction with the accompanying drawings and embodiments; but be to be understood that the utility model is not subjected to the restriction that specifies disclosed herein; the any apparent change that those of ordinary skill in the art makes or be equal to alternative, all should be within protection range of the present utility model.
Claims (2)
1. bidirectional electric energy carry circuit, comprise dc bus, battery unit, switching device, energy storage inductor and isolation capacitance, it is characterized in that: the positive pole of battery unit Bl connects the end of the first energy storage inductor L1, the other end of described the first energy storage inductor L1 connects the end of the first isolation capacitance C1 and the end of the first switching device SW1, and the other end of described the first switching device SW1 connects the negative pole of battery unit Bl and the end of the second isolation capacitance C2; The end that the other end of described the first isolation capacitance C1 connects the second energy storage inductor L2 is connected an end with second switch device SW2: it is anodal that the other end of described second switch device SW2 connects dc bus; The other end of described the second isolation capacitance C2 connects the other end and the dc bus negative pole of the second energy storage inductor L2; The state of the first switching device SW1, second switch device SW2 is controlled by control circuit U1.
2. described a kind of bidirectional energy carry circuit according to claim 1, it is characterized in that: described control circuit U1 is connected with the control end of the first switching device SW1, second switch device SW2 respectively by drive circuit, and the signal deteching circuit two ends of control circuit Ul are connected with negative pole with the positive pole of battery unit Bl respectively; Control circuit sends control signal, and the hocket cycling of turn-on and turn-off of the first switching device SW1, second switch device SW2 realizes the non-energy consumption balance of battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220572802 CN202856422U (en) | 2012-11-02 | 2012-11-02 | Bidirectional electrical energy transfer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220572802 CN202856422U (en) | 2012-11-02 | 2012-11-02 | Bidirectional electrical energy transfer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202856422U true CN202856422U (en) | 2013-04-03 |
Family
ID=47987578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220572802 Expired - Fee Related CN202856422U (en) | 2012-11-02 | 2012-11-02 | Bidirectional electrical energy transfer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202856422U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904317A (en) * | 2012-11-02 | 2013-01-30 | 上海同异动力科技有限公司 | Bidirectional electric energy transfer circuit |
| CN103414218A (en) * | 2013-06-28 | 2013-11-27 | 广东电网公司电力科学研究院 | Battery pack active equalization circuit based on feedback control, and control method thereof |
| CN111697667A (en) * | 2020-07-08 | 2020-09-22 | 中煤科工集团重庆研究院有限公司 | Lithium battery balancing device based on buck-boost circuit and balancing method thereof |
| CN117353432A (en) * | 2023-12-06 | 2024-01-05 | 珠海科创储能科技有限公司 | Electric quantity equalization circuit, method and device, storage medium and electronic equipment |
-
2012
- 2012-11-02 CN CN 201220572802 patent/CN202856422U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904317A (en) * | 2012-11-02 | 2013-01-30 | 上海同异动力科技有限公司 | Bidirectional electric energy transfer circuit |
| CN103414218A (en) * | 2013-06-28 | 2013-11-27 | 广东电网公司电力科学研究院 | Battery pack active equalization circuit based on feedback control, and control method thereof |
| CN103414218B (en) * | 2013-06-28 | 2015-06-10 | 广东电网公司电力科学研究院 | Battery pack active equalization circuit based on feedback control, and control method thereof |
| CN111697667A (en) * | 2020-07-08 | 2020-09-22 | 中煤科工集团重庆研究院有限公司 | Lithium battery balancing device based on buck-boost circuit and balancing method thereof |
| CN111697667B (en) * | 2020-07-08 | 2023-11-24 | 中煤科工集团重庆研究院有限公司 | Lithium battery equalization device and equalization method based on buck-boost circuit |
| CN117353432A (en) * | 2023-12-06 | 2024-01-05 | 珠海科创储能科技有限公司 | Electric quantity equalization circuit, method and device, storage medium and electronic equipment |
| CN117353432B (en) * | 2023-12-06 | 2024-03-26 | 珠海科创储能科技有限公司 | Electric quantity equalization circuit, method and device, storage medium and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101552479B (en) | Direct-current voltage reducing circuit | |
| CN103368268B (en) | Active voltage balancing system and active voltage balancing method for serial energy storage element group | |
| CN103326439A (en) | Equalization circuit of battery pack and equalization method | |
| CN104659877A (en) | Isolation double-way constant-current maintaining system based on power supply of common equipment | |
| CN108011425B (en) | Active equalization circuit and method for battery pack | |
| CN203352246U (en) | Miniature photovoltaic controller based on super-capacitor energy accumulator | |
| CN102891519A (en) | Equalization circuit of battery pack | |
| CN102904317A (en) | Bidirectional electric energy transfer circuit | |
| CN202856422U (en) | Bidirectional electrical energy transfer circuit | |
| CN101944754A (en) | Direct current step-up/step-down circuit | |
| CN102593900B (en) | Equalization device for battery electric quantity | |
| CN103501036B (en) | A kind of charging and discharging lithium battery pilot circuit | |
| CN101764422A (en) | Equalizer circuit for series-connection charge-discharge unit | |
| CN103762630B (en) | A kind of rectification circuit and ups system thereof | |
| CN202888901U (en) | Equalization circuit for battery pack | |
| CN203589787U (en) | Equalization circuit for lithium battery pack | |
| CN204290428U (en) | A kind of integrate motor drives and battery charging function module | |
| CN208589785U (en) | A kind of system for chain type energy storage structure that can eliminate secondary pulsation | |
| CN104167780B (en) | A kind of continuous controlled isolating active active equalization charging module and charge system thereof | |
| CN105186628A (en) | Intelligent charging pile system for electric automobile | |
| CN109586370A (en) | High-integration charging energy storage system and power system | |
| CN201947182U (en) | Bi-directional DC/DC (direct current to direct current) power supply | |
| CN204538732U (en) | Fully-automatic intelligent charging, reparation all-in-one | |
| CN203522276U (en) | Charging and discharging control circuit for lithium battery | |
| CN101562396A (en) | DC voltage booster circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20141102 |
|
| EXPY | Termination of patent right or utility model |