CN211556891U - Charging and discharging control system for series battery pack - Google Patents
Charging and discharging control system for series battery pack Download PDFInfo
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- CN211556891U CN211556891U CN201922137683.6U CN201922137683U CN211556891U CN 211556891 U CN211556891 U CN 211556891U CN 201922137683 U CN201922137683 U CN 201922137683U CN 211556891 U CN211556891 U CN 211556891U
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000000178 monomer Substances 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims description 5
- 230000005669 field effect Effects 0.000 claims 1
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- 238000000034 method Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a series battery pack charge-discharge control system, which comprises a series battery pack, a DC-DC converter group, a balancing unit, a detection unit and a control unit, wherein the series battery pack consists of a plurality of battery monomers connected in series; the DC-DC converter group comprises a plurality of bidirectional DC-DC converters, two wiring output ends on one side of each bidirectional DC-DC converter are connected with corresponding battery monomers, two wirings on the other side of each bidirectional DC-DC converter are connected in parallel, and each bidirectional DC-DC converter is connected to the balancing unit after being connected in parallel; the balancing unit is electrically connected with each DC-DC converter, the detection unit is electrically connected with the series battery pack, and the control unit is electrically connected with the balancing unit, each DC-DC converter group and the detection unit. The utility model discloses control system is favorable to improving energy conversion's work efficiency, under the same condition of DC-DC converter power, can gain stronger balanced effect.
Description
Technical Field
The utility model relates to a technical field that charges, specific saying so relates to a series battery group charge-discharge control system.
Background
The power batteries are connected in series to form a series battery pack, and because the single batteries are inevitably different in raw material consumption, manufacturing, detection processes and the like, after the power batteries are used for a period of time, the capacities of the single batteries are greatly different, unbalance occurs during charging and discharging, the battery voltages are generally different, overcharge and overdischarge phenomena occur, and the total energy storage capacity of the whole battery pack can be influenced by the energy storage capacity of a certain single battery at the moment. And the influence of the unbalance on the power battery pack can be reduced by adopting the battery charging and discharging balancing circuit.
The traditional battery pack balancing mode can be mainly divided into two categories, namely passive balancing and active balancing. The passive equalization method generally adopts resistors to discharge the battery cells with too high voltage, and the equalization capability is limited due to energy consumption. The active equalization method generally performs energy conversion through a DC-DC converter, converts energy in a battery cell with an excessively high voltage into a battery cell with an excessively low voltage, and has low consumption but a relatively complex circuit. And the converter itself consumes a part of energy when operating, which affects the life of the battery pack.
However, an active equalization method is also proposed in the related art, the DC-DC converter is controlled by the PWM signal to realize energy conversion, but the control logic is complex, the potential isolation is not thorough, and the converter has basic consumption when the duty ratio is very low.
SUMMERY OF THE UTILITY MODEL
To not enough among the prior art, the to-be-solved technical problem of the utility model lies in providing a series battery group charge-discharge control system, and the purpose of designing this charge-discharge control system is for the battery group charge-discharge in-process maintains the electric quantity balanced.
In order to solve the technical problem, the utility model discloses a following scheme realizes: the utility model discloses a series battery group charge-discharge control system, this control system includes:
a series battery pack composed of a plurality of battery cells connected in series;
the DC-DC converter group comprises a plurality of bidirectional DC-DC converters, two wiring output ends on one side of each bidirectional DC-DC converter are connected with corresponding battery monomers, two wirings on the other side of each bidirectional DC-DC converter are connected in parallel, and each bidirectional DC-DC converter is connected to the balancing unit after being connected in parallel;
the balancing unit is electrically connected with each DC-DC converter and is used for balancing the energy transferred in or out by each DC-DC converter;
the detection unit is electrically connected with the series battery pack and is electrically connected with the anode and the cathode of each single battery so as to detect the voltage of each single battery, and the detection unit converts the detected voltage into an electric signal with the same potential;
the control unit is electrically connected with the equalizing unit, each DC-DC converter group and the detection unit, collects the electric signals from the detection unit and outputs control signals so as to control each DC-DC converter to work or stop working; each DC-DC converter is controlled by a signal of the control unit, and transmits the energy of the battery monomer to the balancing unit or transmits the energy stored in the balancing unit to the battery monomer corresponding to each DC-DC converter.
Further, the control unit is provided with a voltage signal acquisition module which periodically collects voltage signals from the detection unit according to a preset period, and the control unit controls the DC-DC converters to work or stop working by comparing the voltages of the battery monomers.
Further, the DC-DC converter is provided with a bidirectional energy conversion circuit controlled by a signal of the control unit to select a direction of energy conversion or stop operation.
Furthermore, the control system also comprises a charge-discharge module which is electrically connected with each DC-DC converter and the control unit;
when the DC-DC converter is in a working state, the DC-DC converter can convert voltage energy in a battery cell with high voltage into the charge-discharge module, and can also convert the voltage energy in the charge-discharge module into a battery cell with low voltage;
when the control signal and the DC-DC converter are at different electric potentials, the control signal is subjected to electric potential isolation through a photoelectric coupler.
Furthermore, a voltage signal acquisition module on the control unit acquires the difference between the voltage signal of each DC-DC converter transferred to the charge and discharge module and the voltage signal transferred from the charge and discharge module to adjust the overall working state of each DC-DC converter, so that the transferred voltage and the transferred voltage are dynamically balanced.
Furthermore, a pulse signal generator is arranged in the DC-DC converter, the pulse signal generator is controlled by the signal of the control unit and can complete bidirectional voltage energy conversion, and the pulse signal generator in the DC-DC converter generates a square wave pulse signal with fixed frequency and fixed duty ratio to control the on-off of a MOSFET.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses series battery group charge-discharge control system is when the operating mode that charges, still when discharging the condition, perhaps during the standby state, all has two-way energy conversion, has during partly DC-DC converter converts the energy in the battery monomer that voltage is high into the charge-discharge management unit promptly, has the energy of partly DC-DC converter in with the charge-discharge management unit simultaneously, converts into in the battery monomer that voltage is low. Compared with the prior art, the method is beneficial to improving the working efficiency of energy conversion, and can obtain stronger balancing effect under the condition that the power of the DC-DC converter is the same.
2. The control unit controls the DC-DC converter by comparing the voltages of the battery cells, and the DC-DC converter can start to work only when the voltage difference between the battery cells exceeds a preset threshold value, so that energy conversion is realized. When the voltage difference between the single batteries does not reach the preset threshold value, the system is in a low-energy consumption state, and compared with the prior art, the method is beneficial to prolonging the discharging time of the series battery pack.
3. The control unit collects energy difference signals transmitted by the DC-DC converter to the charging and discharging management unit and the balancing unit to adjust the overall working state of the DC-DC converter, so that the transmitted energy and the transmitted energy are dynamically balanced.
And 4, the internal pulse signal generator of the DC-DC converter generates a square wave pulse signal with fixed frequency and fixed duty ratio to control the on-off of the MOSFET, so that the DC-DC converter can work in the optimal state all the time, and the DC-DC converter has high conversion efficiency and stable work. Compared with the traditional DC-DC converter, the DC-DC converter does not need a current detection resistor inside, and can further reduce the energy consumption.
5. The control unit only controls the DC-DC converter to work or stop working, and controls the direction of energy conversion in a working state without outputting PWM signals, so that the operation workload of the central processing unit can be reduced, the logic is clearer, and the stability and the reliability of the system are enhanced.
6. When the control signal and the DC-DC converter are at different electric potentials, the control signal is subjected to potential isolation through the photoelectric coupler. The battery pack can be expanded to be more in series connection, and stable operation of the system is facilitated.
Drawings
Fig. 1 is a schematic block diagram of the charge and discharge control system of the series battery pack of the present invention.
Fig. 2 is a circuit diagram of a bidirectional DC-DC converter according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention. It is obvious that the described embodiments of the invention are only some of the embodiments of the invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
referring to fig. 1, the present invention provides a charging and discharging control system for a series battery, comprising:
a series battery pack 4 composed of a plurality of battery cells connected in series;
the DC-DC converter group 2 comprises a plurality of bidirectional DC-DC converters, two connection wire output ends on one side of each bidirectional DC-DC converter are connected with corresponding battery monomers, two connection wires on the other side of each bidirectional DC-DC converter are connected in parallel, and each bidirectional DC-DC converter is connected to the balancing unit 1 after being connected in parallel;
the balancing unit 1 is electrically connected to each DC-DC converter and is used for balancing the energy transferred in or out by each DC-DC converter;
the detection unit 5 is electrically connected with the series battery pack 4 and is electrically connected with the anode and the cathode of each single battery so as to detect the voltage of each single battery, and the detection unit 5 converts the detected voltage into an electric signal with the same potential;
the control unit 3 is electrically connected with the equalizing unit 1, each DC-DC converter group 2 and the detection unit, and collects the electric signals from the detection unit 5 and outputs control signals so as to control each DC-DC converter to work or stop working; each DC-DC converter is controlled by a signal of the control unit 3, and transmits energy of a battery cell to the balancing unit 1 or transmits energy stored in the balancing unit 1 to the battery cell corresponding to each DC-DC converter.
A preferred technical solution of this embodiment: the control unit 3 is provided with a voltage signal acquisition module which periodically collects voltage signals from the detection unit 5 according to a preset period, and the control unit 3 controls the operation or stop of each DC-DC converter by comparing the voltage of each battery cell.
A preferred technical solution of this embodiment: the DC-DC converter is provided with a bidirectional energy conversion circuit which is controlled by a signal of the control unit 3 to select a direction of energy conversion or stop operation.
A preferred technical solution of this embodiment: the control system also comprises a charge-discharge module which is electrically connected with each DC-DC converter and the control unit 3;
when the DC-DC converter is in a working state, the DC-DC converter can convert voltage energy in a battery cell with high voltage into the charge-discharge module, and can also convert the voltage energy in the charge-discharge module into a battery cell with low voltage;
when the control signal and the DC-DC converter are at different electric potentials, the control signal is subjected to electric potential isolation through a photoelectric coupler.
A preferred technical solution of this embodiment: the voltage signal acquisition module on the control unit 3 acquires the difference between the voltage signal of each DC-DC converter transferred to the charge and discharge module and the voltage signal transferred from the charge and discharge module to adjust the overall working state of each DC-DC converter, so that the transferred voltage and the transferred voltage are dynamically balanced.
A preferred technical solution of this embodiment: the DC-DC converter is internally provided with a pulse signal generator which is controlled by the signal of the control unit 3 and can complete bidirectional voltage energy conversion, and the pulse signal generator in the DC-DC converter generates a square wave pulse signal with fixed frequency and fixed duty ratio to control the on-off of a MOSFET.
Example 2:
the utility model provides an embodiment of series battery group initiative equalizing system:
as shown in fig. 1-2, the series battery pack 4 is a series battery pack, which is formed by connecting m battery cells B1 … … Bm-1 and Bm in series, and both ends of the battery cells are connected with the detection unit 5; the DC-DC converter group 2 comprises a plurality of bidirectional DC-DC converters T1 … … Tm-1 and Tm, one side of each bidirectional DC-DC converter is connected with a battery monomer, and the other side of each bidirectional DC-DC converter is connected with other bidirectional DC-DC converters in parallel and then connected to the balancing unit.
The detection unit 5 periodically detects the voltage of each battery cell and sends the detected voltage to the control unit 3. The control unit 3 periodically collects and sorts the voltages of the individual cells. When the voltage Va of the battery cell Ba with the highest voltage is higher than the voltage Vz of the battery cell Bz with the lowest voltage, and Va-Vz > Vth (Vth is a preset upper threshold), the control unit 3 outputs a signal to the bidirectional DC-DC converter Ca connected to Ba to control Ca to operate and transfer energy from Ba to the equalizing unit 1, and simultaneously the control unit 3 outputs a signal to the bidirectional DC-DC converter Cz connected to Bz to control Cz to operate and transfer energy from the equalizing unit 1 to Bz. Subsequently, the control unit 3 outputs signals to the bi-directional DC-DC converter Ca connected to Ba and the bi-directional DC-DC converter Cz connected to Bz to control Ba and Bz to stop working, when the voltage Va-Vz < Vtl (Vtl is a preset lower threshold) is detected.
When the voltage Vb of the battery cell Bb with the next highest voltage is higher than the voltage Vy of the battery cell By with the next lowest voltage, and Vb-Vy > Vth (Vth is a preset upper limit threshold), the control unit 3 outputs a signal to the bidirectional DC-DC converter Tb connected to Bb to control Tb to operate and transfer energy from Bb to the equalizing unit 1, and simultaneously the control unit 3 outputs a signal to the bidirectional DC-DC converter Ty connected to Bn to control Ty to operate and transfer energy from the equalizing unit 1 to By. And the control unit 3 outputs signals to the bidirectional DC-DC converter Cb connected with Bb and the bidirectional DC-DC converter Cy connected with By to control Bb and By to stop working when the voltage is subsequently collected and Vb-Vy is found to be < Vtl (Vtl is a preset lower limit threshold).
By analogy, a plurality of groups of bidirectional DC-DC converters can work simultaneously.
The control unit 3 detects the accumulated difference Ee between the input energy and the output energy in the equalizing unit 1, and ensures that the Ee is in an allowable range by controlling the working time or the energy conversion speed of different groups of bidirectional DC-DC converters.
As shown in fig. 2, an embodiment of a bi-directional DC-DC converter circuit is provided. The bidirectional DC-DC converter circuit comprises two MOSFETs (Q1, Q2), a transformer, a photoelectric coupler (U1), a pulse signal generator (U2, U3) and diodes (D1, D2). One end of the primary side of the transformer is connected with the positive electrode of the battery cell Bn, the other end of the primary side of the transformer is connected with the drain electrode of the MOSFET (Q1), the source electrode of the MOSFET (Q1) is connected with the negative electrode of the battery cell Bn, the drain electrode of the MOSFET (Q1) is connected to the pulse signal generator U2, and the pulse signal generator U2 is isolated through the photoelectric coupler U1 and is controlled externally. The other side of the secondary of the transformer is connected to the equalizing unit, the other side of the secondary of the transformer is connected with the drain of a MOSFET (Q2), and the source of the MOSFET (Q2) is connected to the equalizing unit. The gate of the MOSFET (Q2) is connected to the pulse signal generator U3, and the pulse signal generator U3 is controlled externally. The control signal from the outside ensures that only one of the pulse signal generator U2 and the pulse signal generator U3 is in the working state at most, when the pulse signal generator U2 works, the pulse with the optimal frequency and the optimal duty ratio is output, and the bidirectional DC-DC converter transmits energy from Bn to the equalizing unit with the optimal efficiency. When the pulse signal generator U3 operates, pulses of optimal frequency and optimal duty cycle are output, and the bidirectional DC-DC converter transfers energy from the equalizing unit to Bn with optimal efficiency.
When the pulse signal generator U2 and the pulse signal generator U3 all stop operating, the bidirectional DC-DC converter is in a standby state.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (6)
1. A series battery charge-discharge control system, the control system comprising:
a series battery pack (4) composed of a plurality of battery cells connected in series;
the DC-DC converter group (2) comprises a plurality of bidirectional DC-DC converters, two wiring output ends on one side of each bidirectional DC-DC converter are connected with corresponding battery monomers, two wirings on the other side of each bidirectional DC-DC converter are connected in parallel, and each bidirectional DC-DC converter is connected to the balancing unit (1) after being connected in parallel;
the balancing unit (1) is electrically connected with each DC-DC converter and is used for balancing the energy transferred in or out by each DC-DC converter;
the detection unit (5) is electrically connected with the series battery pack (4) and is electrically connected with the anode and the cathode of each single battery so as to detect the voltage of each single battery, and the detection unit (5) converts the detected voltage into an electric signal with the same potential;
the control unit (3) is electrically connected with the equalizing unit (1), each DC-DC converter group (2) and the detection unit, collects the electric signals from the detection unit (5) and outputs control signals so as to control each DC-DC converter to work or stop working; each DC-DC converter is controlled by a signal of the control unit (3), and the energy of the battery cell is transmitted to the equalizing unit (1) or the energy stored in the equalizing unit (1) is transmitted to the battery cell corresponding to each DC-DC converter by each DC-DC converter.
2. The charging and discharging control system of claim 1, wherein the control unit (3) is provided with a voltage signal collecting module which collects voltage signals from the detecting unit (5) periodically according to a preset period, and the control unit (3) controls the operation or stop of each DC-DC converter by comparing the voltage of each battery cell.
3. A series battery charging and discharging control system according to claim 2, characterized in that said DC-DC converter is provided with a bidirectional energy conversion circuit, which is controlled by the signal of said control unit (3) to select the direction of energy conversion or to stop operation.
4. The charging and discharging control system of claim 3, further comprising a charging and discharging module electrically connected to each DC-DC converter and the control unit (3);
when the DC-DC converter is in a working state, the DC-DC converter can convert voltage energy in a battery cell with high voltage into a charge-discharge module;
when the control signal and the DC-DC converter are at different electric potentials, the control signal is subjected to electric potential isolation through a photoelectric coupler.
5. The charging and discharging control system of claim 4, wherein the voltage signal acquisition module on the control unit (3) acquires the difference between the voltage signal of each DC-DC converter transferred to the charging and discharging module and the voltage signal transferred from the charging and discharging module to adjust the overall working state of each DC-DC converter, so that the transferred voltage and the transferred voltage are dynamically balanced.
6. The charging and discharging control system of claim 1, wherein the DC-DC converter is internally provided with a pulse signal generator, the pulse signal generator is controlled by the signal of the control unit (3) and can perform bidirectional voltage energy conversion, and the pulse signal generator therein generates a square wave pulse signal with fixed frequency and fixed duty ratio to control the on/off of a MOSFET field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922137683.6U CN211556891U (en) | 2019-12-03 | 2019-12-03 | Charging and discharging control system for series battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922137683.6U CN211556891U (en) | 2019-12-03 | 2019-12-03 | Charging and discharging control system for series battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN211556891U true CN211556891U (en) | 2020-09-22 |
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| CN201922137683.6U Expired - Fee Related CN211556891U (en) | 2019-12-03 | 2019-12-03 | Charging and discharging control system for series battery pack |
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| CN (1) | CN211556891U (en) |
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Granted publication date: 20200922 |