CN108565937B - Active equalization circuit and energy management system - Google Patents
Active equalization circuit and energy management system Download PDFInfo
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- CN108565937B CN108565937B CN201810720588.6A CN201810720588A CN108565937B CN 108565937 B CN108565937 B CN 108565937B CN 201810720588 A CN201810720588 A CN 201810720588A CN 108565937 B CN108565937 B CN 108565937B
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- 238000007599 discharging Methods 0.000 description 4
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- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an active equalization circuit and an energy management system, which relate to the technical field of energy management, wherein the equalization circuit comprises: the balance management module is connected with the balance management module; the equalization module comprises a power supply conversion unit and a switching unit; the switching unit comprises a plurality of switching circuits; each switching circuit comprises a power input interface and an equalization interface; the power supply conversion unit is used for being connected with an input power supply to charge the energy storage element; the equalization management module is used for collecting the energy storage parameters of the energy storage element, sending the energy storage parameters to the processor, receiving the equalization command issued by the processor, sending an equalization signal to the equalization interface, and performing equalization management on the energy storage element. The active equalization circuit and the energy management system provided by the invention are beneficial to reducing the number of electronic elements, and greatly reduce the equalization cost while improving the equalization management performance of the energy storage element group.
Description
Technical Field
The invention relates to the technical field of energy management, in particular to an active equalization circuit and an energy management system.
Background
The energy storage element can be used for connecting renewable energy sources into the fields of electric vehicles, electric ships, electric driving robots, electric driving aircrafts, fixed energy sources and mobile energy sources and the like on a large scale. Particularly, in the fields of energy storage power supplies and the like which need rapid or high-power charge and discharge, a large number of energy storage elements are required to be combined in series and parallel so as to achieve the required voltage and capacity grade.
The existing energy storage element is easy to cause the problem of gradually deteriorating consistency in use due to factors such as design environment, performance difference of the energy storage element and the like, so that the performance of the energy storage element after being grouped is reduced, and the energy storage effect is influenced. The concrete steps are as follows: estimating a deterioration of a remaining capacity (SOC, state of Charge) of the energy storage element; the service life of the energy storage element group is shortened, and the service life of a single energy storage element cannot be reached; discrete and gradual aggravated individual energy storage elements seriously affect the overall high-power charge and discharge performance of the energy storage element group.
Therefore, the energy storage element group is generally managed in a balanced management manner. Currently, there are two general categories of energy storage element balancing management: the energy storage elements with the voltage higher than the average value are respectively consumed by resistors in an energy dissipation type passive balancing mode, so that the voltages of the energy storage elements are basically consistent, balanced management is realized, and the energy utilization efficiency of the balanced management mode is the lowest; an active equalization mode adopts a multipath DC/DC isolation converter to realize energy flow or adopts an energy storage element time-sharing power supply mode; and the power is supplied respectively after the rectification by adopting a multi-winding high-frequency isolation transformer.
However, the equalization mode cannot be well connected with the current general equalization management chip, so that the number of used elements is too large, the volume is too large, and the technical problem of high active equalization cost is further caused.
Disclosure of Invention
Accordingly, the present invention is directed to an active equalization circuit and an energy management system, so as to alleviate the above technical problem of high active equalization cost.
In a first aspect, an embodiment of the present invention provides an active equalization circuit, including: the balance management module is connected with the balance management module; the equalization module comprises a power supply conversion unit and a switching unit; the switching unit comprises a plurality of switching circuits, wherein the switching circuits are used for being connected with the energy storage element; each switching circuit comprises a power input interface and an equalization interface; the switching circuit is connected with the power supply conversion unit through a power supply input interface, and is connected with the equalization management module through an equalization interface; the power supply conversion unit is used for being connected with an input power supply, converting the input power supply into multiple output power supplies, and respectively transmitting the multiple output power supplies to the switching circuit to charge the energy storage element; the equalization management module is used for collecting the energy storage parameters of the energy storage element, sending the energy storage parameters to the processor, receiving the equalization command issued by the processor, sending an equalization signal to the equalization interface, and performing equalization management on the energy storage element.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the switching circuit includes a first switching leg and a second switching leg that are sequentially connected; the positive electrode interface of the power input interface is arranged on the first switch branch; the negative electrode interface of the power input interface is arranged on the second switch branch; the equalization interface is arranged at the input end of the second switch branch; the second switch branch receives the equalization signal through the equalization interface, controls the on-off state of the first switch branch according to the equalization signal, and performs equalization management on the energy storage element.
With reference to the first possible implementation manner of the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, where the first switching leg is a switching leg of a switching tube, and the switching tube is a PNP switching tube.
With reference to the first possible implementation manner of the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, where the second switching leg is a switching leg of a switching tube, and the switching tube is an NPN switching tube.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the equalization management module includes an equalization management chip; the equalization management chip is provided with a plurality of equalization pins; the equalization interface of each switching circuit is connected to an equalization pin.
With reference to the fourth possible implementation manner of the first aspect, the embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the equalization management module further includes an energy storage parameter collection interface connected to the equalization management chip, and the energy storage parameter collection interface is used for collecting energy storage parameters, where the energy storage parameter collection interface includes an electrical signal collection interface and a temperature collection interface; the electric signal acquisition interface is connected with the output end of the energy storage element and is used for acquiring the electric parameters of the energy storage element; the temperature acquisition interface is connected with the temperature sensor and is used for acquiring the near-field temperature parameter of the energy storage element.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the equalization management chip further includes a communication interface; the equalization management chip is also used for being connected with the processor through the communication interface and sending the energy storage parameters to the processor so that the processor can calculate and process the energy storage parameters; and receiving an equalization command issued by the processor.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the power conversion unit is a multi-output high-frequency power supply, and includes an input interface and a plurality of output interfaces; the input interface is used for being connected with an input power supply; the output interface is used for being connected with a power input interface of the switching circuit.
In a second aspect, an embodiment of the present invention further provides an energy management system, where the energy management system includes a processor, and further includes the equalization circuit described in the first aspect; wherein, the processor is connected with the equalizing circuit.
With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the processor includes a plurality of interfaces; the plurality of interfaces includes at least a communication interface and a control interface.
The embodiment of the invention has the following beneficial effects:
The active equalization circuit and the energy management system are connected with the energy storage elements through the switching circuit, the switching circuit further comprises a power input interface and an equalization interface, an input power source can be transmitted to the energy storage elements through the switching circuit, and then the energy storage elements are charged, meanwhile, the equalization management module can collect energy storage parameters of each energy storage element, send the energy storage parameters to the processor, and after receiving an equalization command issued by the processor, send equalization signals to the equalization interface to perform equalization management on the energy storage elements, so that the problem of poor consistency caused by performance difference of the energy storage elements is effectively avoided, meanwhile, the number of electronic elements is reduced through an equalization mode of connection between the equalization management module and the switching circuit, equalization cost is greatly reduced while equalization management performance of an energy storage element group is improved, and reliability of the active equalization circuit is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of an active equalization circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a switching circuit according to an embodiment of the present invention;
Fig. 3 is a schematic circuit diagram of an active equalization circuit according to an embodiment of the present invention;
FIG. 4 is a block diagram of an energy management system according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an energy management system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In general, the energy storage element has a problem of gradually deteriorating consistency in use due to differences in design process, use environment and performance of the energy storage element, which easily causes performance degradation of the energy storage element and affects use effect of users.
At present, the common active equalization circuit and the equalization management chip cannot be well connected, so that the problems of excessive used elements and overlarge volume are caused, or the realization cost of the equalization management chip which is well connected is higher.
Based on the above, the embodiment of the invention provides an active equalization circuit and an energy management system, so as to alleviate the technical problem of higher active equalization cost.
For the sake of understanding the present embodiment, an equalization circuit disclosed in the embodiment of the present invention will be described in detail first.
Embodiment one:
The embodiment of the invention provides an active equalization circuit, which is shown in a structural block diagram of the active equalization circuit in fig. 1, and comprises the following components: an equalization management module 10 and an equalization module 20 connected to the equalization management module 10; the equalizing module 20 includes a power conversion unit 201 and a switching unit 202; the switching unit 202 comprises a plurality of switching circuits 203 for connection with the energy storage element, of which only one is shown in fig. 1 for ease of illustration.
Specifically, each switching circuit 203 includes a power input interface 204 and an equalization interface 205; the switching circuit 203 is connected to the power conversion unit 201 through the power input interface 204, and the switching circuit 203 is connected to the equalization management module 10 through the equalization interface 205.
When the power supply conversion unit is specifically implemented, the power supply conversion unit is used for being connected with an input power supply, converting the input power supply into a plurality of output power supplies, and respectively transmitting the plurality of output power supplies to the switching circuit to charge the energy storage element; the equalization management module is used for collecting the energy storage parameters of the energy storage element, sending the energy storage parameters to the processor, receiving the equalization command issued by the processor, sending an equalization signal to the equalization interface, and performing equalization management on the energy storage element.
Specifically, the equalization management module may be connected to the processor, receive a parameter acquisition instruction issued by the processor, implement acquisition of energy storage parameters of the energy storage element under the triggering of the processor, and send the energy storage parameters to the processor, where the processor may perform calculation processing on the energy storage parameters to generate a final equalization command, such as which energy storage element needs equalization, and issue the equalization command to the equalization management module; at this time, the equalization management module may receive the equalization command issued by the processor, and send an equalization signal to the equalization interface, so as to perform active equalization management on the energy storage element.
The active equalization circuit provided by the embodiment of the invention is connected with the energy storage elements through the switching circuit, and the switching circuit also comprises a power input interface and an equalization interface, so that an input power source can be transmitted to the energy storage elements through the switching circuit, and further, the energy storage elements are charged, meanwhile, the equalization management module can collect the energy storage parameters of each energy storage element, send the energy storage parameters to the processor, and after receiving an equalization command issued by the processor, send an equalization signal to the equalization interface to perform equalization management on the energy storage elements, thereby effectively avoiding the problem of poor consistency caused by performance difference of the energy storage elements.
When the method is specifically implemented, each switching circuit can be connected with one energy storage element, so that the multi-path energy storage elements can be charged and discharged simultaneously, the equalization speed is improved, and the requirement of quick equalization is met.
In the process of charging and discharging the energy storage element, the equalization management module can acquire the energy storage parameters of the energy storage element in real time so as to acquire the unbalanced severity of the energy storage element in time and further carry out single-path or less-path charging.
In order to achieve the function of optimizing the equalization management, the switching circuit generally includes a first switching branch and a second switching branch which are sequentially connected; the positive electrode interface of the power input interface is arranged on the first switch branch; the negative electrode interface of the power input interface is arranged on the second switch branch; the equalization interface is arranged at the input end of the second switching branch.
Specifically, the second switch branch receives an equalization signal through the equalization interface, and controls the on-off state of the first switch branch according to the equalization signal so as to perform equalization management on the energy storage element. For example, the charging loop of the energy storage element is controlled, such as on or off, so as to realize balanced management.
For ease of understanding, fig. 2 shows a schematic circuit diagram of a switching circuit, where BT1 is an energy storage element, and specifically, the energy storage element may be a device or a device with energy storage, such as a storage battery, a capacitor, a super capacitor, and a module formed by oil gas, etc.
As shown in the schematic circuit diagram of the switching circuit shown in fig. 2, the first switching branch is a switching branch of a switching tube, and the switching tube of the first switching branch is a PNP switching tube. Further, the second switching branch is also a switching branch of a switching tube, and the switching tube of the second switching branch is an NPN triode.
In the schematic circuit diagram shown in fig. 2, the above-mentioned switching transistor is taken as an example of a transistor, and as shown in fig. 2, the transistor Q1 and the transistor Q2 are PNP transistors, so as to form a transistor switching branch, and the first branch further includes a resistor R1 and a resistor R2 in addition to the transistor Q1 and the transistor Q2. The triode Q3 is an NPN triode, a second switch branch is formed, besides the triode Q3, the second switch branch further comprises a voltage stabilizing tube D1, the voltage stabilizing tube D1 is connected with the triode Q3 in parallel, specifically, the anode of the voltage stabilizing tube D1 is connected with the source electrode of the triode Q3, the cathode of the voltage stabilizing tube D1 is connected with the grid electrode of the triode Q3, and the voltage stabilizing and protecting effects on the triode Q3 are achieved.
The IN+ pin is a pin of a positive electrode interface of the power input interface; the output power of the power supply conversion unit is connected to the switching circuit through an IN+ pin; the IN-pin is a pin of a negative electrode interface of the power input interface; the IN0 pin is the pin of the balanced interface.
Specifically, taking the above transistors Q1, Q2, and Q3 as MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide-semiconductor field-effect transistors) as examples, the in+ pin is connected to one end of the resistor R1 and the D pole of Q1, the S pole of Q1 is connected to the D pole of Q2, and the S pole of Q2 is connected to the positive pole of the energy storage element; the other end of the resistor R1 is connected with one section of the resistor R2 and the D electrode of the Q3; the other end of the resistor R2 is connected with the G poles of the Q1 and the Q2. The anode of the voltage stabilizing tube D1, the S pole of the Q3 and the cathode of the energy storage element are connected with the IN-pin, and the cathode of the voltage stabilizing tube D1 and the G pole of the Q3 are connected with the IN0 pin.
It should be understood that fig. 2 is only one possible implementation provided by the embodiment of the present invention, and is not the only implementation, and the types and parameters of the switching tubes thereof may be set according to actual use conditions, which is not limited by the embodiment of the present invention. Further, fig. 2 shows only a schematic diagram of one switching circuit in the equalization circuit, and in practical use, the switching unit generally includes a plurality of switching circuits, each of which may be connected to the energy storage element, so fig. 3 shows a schematic circuit diagram of an active equalization circuit, where in fig. 3, the active equalization circuit is shown in a dashed frame, and BT1 to BTn and btn+1 outside the dashed frame are the energy storage elements.
Specifically, for convenience of explanation, the equalization management module 10 and the power conversion unit 201 are further illustrated in fig. 3, and a plurality of switching circuits are included in fig. 3, wherein only one switching circuit connected to the energy storage element BT1 and the switching circuit connected to the energy storage element btn+1 are illustrated, and each of the switching circuits is composed of a resistor R1, a resistor R2, a regulator D1, a transistor Q2, and a transistor Q3; and the resistor Rn+1, the resistor Rn+2, the voltage regulator Dn+1, the triode Qn+1, the triode Qn+2 and the triode Qn+3.
In the operation process of the active equalization circuit, a connection point between the cathode of the voltage stabilizing tube D1 and the grid electrode of the triode Q3 is used as an equalization interface, is connected with the equalization management module, and receives an equalization signal sent by the equalization module, so that the on and off of the triode Q3 are controlled; when the equalizing signal is at a high level, the triode Q3 is conducted, so that the grid level of the triode Q1 and the grid level of the triode Q2 are low, and at the moment, the switching tubes of the triode Q1 and the triode Q2 are all conducted; the power supply conversion unit which is started converts an input power supply into a multi-path output power supply, charges corresponding energy storage elements, the equalization management module can acquire energy storage parameters in real time and sends the energy storage parameters to the processor, the processor performs calculation processing until the energy of the corresponding energy storage elements reaches average energy or energy which needs to be supplemented, the equalization management module sends an equalization command, the equalization management module sends an equalization signal with low level to the equalization interface after receiving the equalization command, so that the triode Q3 is cut off, the control level of the triode Q1 and the triode Q2 is high, at the moment, the switches of the triode Q1 and the triode Q2 are all cut off, and the energy storage elements are not charged; the equalization of the first path of energy storage element is finished; the processor may determine the balance energy by monitoring an energy storage parameter of the energy storage element, for example, if the energy storage element is a battery, a voltage value of the battery may be monitored, if the energy storage element is a capacitor, a capacitance value may also be monitored, and the balance energy may be specifically set according to an actual energy storage element, which is not limited in this embodiment of the present invention. When there are a plurality of energy storage elements, the equalization process of the remaining energy storage elements and the switching process of the switching circuit are consistent with the above processes, and will not be described herein.
In general, the charging processes of the multiple paths of energy storage elements can be performed simultaneously, so as to improve the equalization speed and meet the requirement of quick equalization, such as the field of high-power charging and discharging; according to the severity of unbalance of the energy storage elements, single-way or small-way charging can be performed firstly, when the output ways are smaller under the condition that the power of the power supply conversion unit is certain, the output power of the corresponding ways can be greatly increased, the high-power charging current can rapidly eliminate the energy loss of the individual energy storage elements, then the energy storage elements are charged in multiple ways, and the optimized balanced management of the energy storage element group is realized.
Meanwhile, considering that the energy storage element stores more energy, a safety device can be arranged in each switching circuit, for example, the safety device is arranged on a connecting passage between the triode Q2 and the energy storage element, so that the occurrence of the event that the energy storage element is short-circuited and the switching circuit is burnt is avoided.
Further, the PNP type switching Transistor and the NPN type switching Transistor included in the switching circuit may be semiconductor devices, for example, the PNP type switching Transistor may include a MOSFET, an IGBT (Insulated Gate Bipolar Transistor ), a silicon carbide Transistor, a GTO (Gate-Turn-Off Thyristor), a GTR (Giant Transistor), a device or an integrated circuit having switching performance, and a device having switching performance, such as a relay, and may be connected in series between the energy storage element and the output terminal of the power conversion unit, and similarly, the NPN type switching Transistor may also be an NPN type semiconductor device switching Transistor, an integrated circuit including a MOSFET, and the like, and may be specifically configured according to practical requirements.
The switching circuit has the characteristic of low cost, can be well connected with the equalization management module to realize the purpose of active equalization, greatly reduces the volume and the cost of the active equalization circuit, improves the reliability of the active equalization circuit, is beneficial to improving the performance of equalization management of the energy storage element group, and prolongs the service life of the energy storage element group.
In actual use, the equalization management module may include an equalization management chip (not shown in fig. 3), specifically, the equalization management chip may be an integrated circuit with a plurality of equalization control pins, and a plurality of equalization pins are disposed; the equalizing interface of each switching circuit is connected to equalizing pins, such as LTC6800 series, AD7280 and the like, and an equalizing signal is output through the equalizing control pins of the equalizing interface to control the switching circuit to be turned on and turned off. Of these, only 2 equalization pins J1 and J2 are shown in fig. 3 for ease of illustration.
Further, in order to implement a process of acquiring the energy storage parameters of the energy storage element by the equalization management module, the equalization management module further includes an energy storage parameter acquisition interface connected with the equalization management chip, as shown in fig. 3, an energy storage parameter acquisition interface J3 is used for acquiring the energy storage parameters, where the energy storage parameter acquisition interface may include an electrical signal acquisition interface and a temperature acquisition interface; specifically, the electric signal acquisition interface is connected with the output end of the energy storage element and is used for acquiring the electric parameters of the energy storage element; the temperature acquisition interface is connected with the temperature sensor and is used for acquiring the near-field temperature parameter of the energy storage element, wherein the temperature sensor can be in contact with the outer surface of the energy storage element and can also be arranged around the energy storage element, so that the acquisition of the near-field temperature parameter is realized.
The balance management chip has the function of collecting electric signals and temperature parameters of the multipath energy storage elements through the energy storage parameter collecting interface, and the balance control pin can be used for general dissipation type balance.
Meanwhile, for the purpose of active equalization, the equalization management chip generally includes a communication interface, such as the communication interface J4 shown in fig. 3; the equalization management chip is also used for being connected with the processor through the communication interface and sending the energy storage parameters to the processor so that the processor can calculate and process the energy storage parameters; and receiving an equalization command issued by the processor, transmitting an equalization signal to the equalization interface according to the equalization command, performing equalization management on the energy storage element, and realizing the processes of reading the energy storage parameters by the processor and issuing the equalization command. Specifically, the processor reads the electric signals or the energy storage parameters such as the temperature and the like of each energy storage element sent by the equalization management chip, and after calculation processing, can send an equalization command for executing equalization management to the equalization management chip to realize equalization management; meanwhile, aiming at abnormal information, corresponding control output can be adopted, so that the aim of protecting the energy storage element group is fulfilled; meanwhile, the processor can also interact with the outside, such as being connected with an upper computer, and execute corresponding commands issued by the upper computer, so as to realize a management system with active equalization.
In the actual use process, the power supply conversion unit in the embodiment of the invention can be a multipath output high-frequency power supply and comprises an input interface and a plurality of output interfaces; the input interface is used for being connected with an input power supply; the output interface is used for being connected with the power input interface of the switching circuit.
The input power source of the multi-output high-frequency power source can be a wide-range input power source, specifically, can be energy storage element group voltage or external voltage, such as a public power source, other group power sources of a plurality of series energy storage element groups, or a whole group power source. Meanwhile, the multi-output high-frequency power supply has multi-path direct current output, and can control whether the multi-path output power supply works or not through a control signal to realize power output and closing, and the working principle of the multi-path output high-frequency power supply can adopt various conversion circuits, such as forward and flyback converters, half-bridge converters, full-bridge converters and the like, and can be composed of at least one power transmission magnetic core, one input winding, a plurality of output windings and other energy transmission components, and the specific form can be realized by referring to related technical data.
The active equalization circuit provided by the embodiment of the invention is connected with the energy storage elements through the switching circuit, and the switching circuit also comprises a power input interface and an equalization interface, so that an input power source can be transmitted to the energy storage elements through the switching circuit, and further, the energy storage elements are charged, meanwhile, the equalization management module can collect the energy storage parameters of each energy storage element, send the energy storage parameters to the processor, and after receiving an equalization command issued by the processor, send an equalization signal to the equalization interface to perform equalization management on the energy storage elements, thereby effectively avoiding the problem of poor consistency caused by performance difference of the energy storage elements.
Embodiment two:
On the basis of the embodiment, the embodiment of the invention also provides an energy management system, wherein the energy management system comprises a processor and the active equalization circuit in the first embodiment; the processor is connected with the active equalization circuit.
Further, the energy management system according to the embodiment of the invention further comprises an upper computer connected with the processor.
For ease of understanding, fig. 4 shows a block diagram of an energy management system, including a processor 400, an upper computer 401, and an active equalization circuit 402. In particular, the system may include a plurality of active equalization circuits, each of which may be connected to the energy storage element group. The active equalization circuits may be connected to one processor or to a plurality of processors, and when there are a plurality of processors, each processor may be connected to each other in a communication manner.
Further, the processor may include a plurality of interfaces, the plurality of interfaces including at least a communication interface and a control interface; the processor may be connected to the active equalization circuit through the interface.
In a specific implementation, the processor may be a processor with a computing process and an external communication function, for example, a processor based on a single chip microcomputer chip, or a DSP (DIGITAL SIGNAL Processing technology) chip, or an ARM (ADVANCED RISC MACHINES, microprocessor) chip, etc., which may be specifically set according to an actual use situation, and the embodiment of the present invention is not limited to this.
For ease of understanding, fig. 5 shows a schematic circuit diagram of an energy management system, where fig. 5 illustrates an example in which a processor is connected to an active equalization circuit. As shown in fig. 5, the device includes a processor 400, a power conversion unit 201, and an equalization management module 10, and specifically, the processor 400 is provided with a plurality of interfaces, where, for convenience of illustration, only an interface J5 is shown in fig. 5, and an interface J6, and other multiple interfaces are replaced by Jn, where, the interface J5 is connected with a communication interface J4 of the equalization management module 10, and the processor 400 reads, through the interface J5, energy storage parameters such as an electrical signal and a temperature of each energy storage element sent by the equalization management chip, and after calculation processing, a command for executing equalization management can be sent to the equalization management chip, so as to implement active equalization management. Further, the interface J6 may be connected to the control port CTL of the power conversion unit 201, and send a control signal to the power conversion unit to control whether the multiple output power supplies operate, to implement output and shutdown of each power supply, and so on.
In addition, the interfaces of the processor may further include a parameter collection interface of the energy storage element, where the parameter collection interface is used to collect parameters of the energy storage element group, where the parameters collected by the processor may include total electrical signals of the energy storage element group, such as total voltage parameters, or total current parameters, so as to facilitate management of the whole charging and discharging process of the energy storage element group by the energy management system. Therefore, through the above-described plurality of interfaces, the processor can realize communication connection with the equalization management chip, communication connection with other processors, communication connection with the power conversion unit, and communication connection with other devices.
Furthermore, the control interface of the processor can be connected with a main switch circuit of the energy storage element group, and the whole charging and discharging process of the energy storage element group is controlled in a switching way by triggering the main switch circuit.
When the energy storage element is a 12-group battery pack, a super capacitor module and the like which are connected in series, the multi-output high-frequency power supply (power supply conversion unit) can have 12 paths of direct current output, at least one path of battery pack, super capacitor and the like can be charged simultaneously according to the requirements, equalization is realized, multiple groups of battery packs and super capacitor modules can be charged simultaneously, and the multi-channel high-frequency power supply can be applied to the fields of robots, small ships, standby power supplies and the like.
Further, for the situation that more energy storage elements are connected in series, for example, the energy storage elements are 24 strings of battery packs, super capacitor modules and the like, at the moment, two power conversion units can be arranged, each power conversion unit has 12 paths of direct current output, and each power conversion unit is connected with a processor in a communication mode.
The energy management system can realize the balanced management circuit system of the multi-series energy storage element group as required, can also realize the balanced management circuit system of the multi-parallel energy storage element group, forms low-voltage series connection, low-voltage parallel connection, high-voltage series connection, high-voltage parallel connection and other energy storage forms, and can be applied to the fields of robots, small ships, standby power supplies and the like, and can also be applied to the fields of electrically-driven buses, logistics vehicles, electrically-driven locomotives, electrically-driven ships and the like.
It should be understood that fig. 4 is merely a schematic diagram of an energy management system, and a specific form thereof, and a serial or parallel system may be configured according to actual use, which is not limited by the embodiment of the present invention.
The energy management system provided by the embodiment of the invention has the same technical characteristics as the active equalization circuit provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
The computer program product of the active equalization circuit and the energy management system provided by the embodiments of the present invention includes a computer readable storage medium storing program codes, where the instructions included in the program codes may be used to execute the system described in the foregoing method embodiments, and specific implementation may refer to the foregoing embodiments and will not be repeated herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing embodiment, which is not described in detail herein.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
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.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention for illustrating the technical solution of the present invention, but not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the foregoing examples, it will be understood by those skilled in the art that the present invention is not limited thereto: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (8)
1. An active equalization circuit, comprising: the balance management module is connected with the balance management module;
the equalization module comprises a power supply conversion unit and a switching unit;
The switching unit comprises a plurality of switching circuits, wherein the switching circuits are used for being connected with the energy storage element;
Each switching circuit comprises a power input interface and an equalization interface; the switching circuit is connected with the power conversion unit through the power input interface, and is connected with the equalization management module through the equalization interface;
The power supply conversion unit is used for being connected with an input power supply, converting the input power supply into multiple paths of output power supplies, and respectively transmitting the multiple paths of output power supplies to the switching circuit to charge the energy storage element;
The equalization management module is used for collecting energy storage parameters of the energy storage element, sending the energy storage parameters to the processor, receiving an equalization command issued by the processor, sending an equalization signal to the equalization interface, and performing equalization management on the energy storage element;
The balance management module comprises a balance management chip; the equalization management chip is provided with a plurality of equalization pins;
the equalization interface of each switching circuit is connected to the equalization pin;
the switching circuit comprises a first switching branch and a second switching branch which are sequentially connected;
The positive electrode interface of the power input interface is arranged on the first switch branch; the negative electrode interface of the power input interface is arranged on the second switch branch;
the equalization interface is arranged at the input end of the second switch branch;
The second switch branch receives the equalization signal through the equalization interface, controls the on-off state of the first switch branch according to the equalization signal, and performs equalization management on the energy storage element.
2. The active equalization circuit of claim 1, wherein the first switching leg is a switching tube switching leg and the switching tube is a PNP switching tube.
3. The active equalization circuit of claim 1, wherein the second switching leg is a switching tube switching leg and the switching tube is an NPN switching tube.
4. The active equalization circuit of claim 1, wherein the equalization management module further comprises an energy storage parameter collection interface connected to the equalization management chip for collecting the energy storage parameters, wherein the energy storage parameter collection interface comprises an electrical signal collection interface and a temperature collection interface;
The electric signal acquisition interface is connected with the output end of the energy storage element and is used for acquiring the electric parameters of the energy storage element;
The temperature acquisition interface is connected with the temperature sensor and is used for acquiring the near-field temperature parameter of the energy storage element.
5. The active equalization circuit of claim 1, wherein the equalization management chip further comprises a communication interface;
The equalization management chip is also used for being connected with the processor through the communication interface and sending the energy storage parameters to the processor so that the processor can calculate and process the energy storage parameters; and receiving the equalization command issued by the processor.
6. The active equalization circuit of claim 1, wherein the power conversion unit is a multiplexed output high frequency power supply comprising an input interface and a plurality of output interfaces;
the input interface is used for being connected with the input power supply;
the output interface is used for being connected with a power input interface of the switching circuit.
7. An energy management system, characterized in that the energy management system comprises a processor and further comprises an active equalization circuit according to any one of claims 1-6;
the processor is connected with the active equalization circuit.
8. The energy management system of claim 7, further comprising a host computer coupled to the processor.
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