CN213521317U - Voltage balancing device and energy storage system - Google Patents
Voltage balancing device and energy storage system Download PDFInfo
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- CN213521317U CN213521317U CN202021434340.2U CN202021434340U CN213521317U CN 213521317 U CN213521317 U CN 213521317U CN 202021434340 U CN202021434340 U CN 202021434340U CN 213521317 U CN213521317 U CN 213521317U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a voltage balancing device and energy storage system relates to battery management technical field, and wherein voltage balancing device includes: the main control module, PWM control module, voltage signal acquisition module, drive module, the transformer, can transmit for main control module through the voltage signal that voltage signal acquisition module detected, main control module judges and sends control command to PWM control module through above-mentioned voltage signal, main control module also can send control command to drive module simultaneously, control the primary side of transformer through drive module, and control the secondary side of transformer through PWM control module, thereby control the transformer and charge for the load of undervoltage, keep the equilibrium of electric quantity in the load, the realization principle is simple, thereby voltage balance efficiency and reliability have been improved.
Description
Technical Field
The utility model belongs to the technical field of the battery management technique and specifically relates to a battery balancing unit and energy storage system are related to.
Background
The storage battery pack is an independent and reliable power supply, is not influenced by an alternating current power supply, can still ensure that electric equipment in a direct current system reliably and continuously works and has stable voltage when any accident occurs in a power plant or a transformer substation; meanwhile, the power supply can also be used as an emergency lighting power supply of a whole plant and a whole station, and is a final barrier for ensuring that the power supply is not interrupted.
However, the battery pack often causes other batteries to be overcharged or undercharged due to a voltage change (high or low) of some of the batteries during operation. Since the batteries are connected in series, the balancing problem of the batteries determines the performance of the entire battery pack; at present, the problems of low efficiency and low reliability often exist in the solution of voltage equalization of the storage battery pack.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a voltage balancing device can improve storage battery voltage balance's balanced efficiency and reliability.
The utility model discloses still provide an energy storage system.
According to the utility model discloses a voltage balancing device of first aspect embodiment includes: the voltage signal acquisition module is used for acquiring a voltage signal of the storage battery pack; the main control module is connected with the voltage signal acquisition module and used for receiving the voltage signal sent by the voltage signal acquisition module and generating a first control instruction, a second control instruction and a third control instruction according to the voltage signal; the PWM control module is connected with the main control module and used for receiving the first control instruction sent by the main control module and sending a PWM control instruction after executing the first control instruction; the driving module comprises a first driving module and a second driving module, the first driving module and the second driving module are both connected with the main control module, and the first driving module is used for receiving the second control instruction sent by the main control module and sending a first driving instruction according to the second control instruction; the second driving module is used for receiving the third control instruction sent by the main control module and sending a second driving instruction according to the third control instruction; the primary side of the transformer is connected with the first driving module and the second driving module respectively and used for receiving the first driving instruction and the second driving instruction respectively, the secondary side of the transformer is connected with the PWM control module and used for receiving the PWM control instruction, the secondary side of the transformer is also connected with the central point of the storage battery pack, and the primary side of the transformer is driven through the first driving instruction and/or the second driving instruction so that the secondary side of the transformer charges one part of the corresponding storage battery pack and the voltage of the storage battery pack is balanced.
According to the utility model discloses voltage balancing device has following beneficial effect at least: can transmit for host system through the voltage signal that voltage signal acquisition module detected, host system judges and sends control command through above-mentioned voltage signal and gives PWM control module, host system also can send control command simultaneously and give drive module, control the primary side of transformer through drive module, and control the secondary side of transformer through PWM control module, thereby control the transformer and charge for the load of undervoltage, keep the equilibrium of electric quantity in the load, the realization principle is simple, thereby voltage balance efficiency and reliability have been improved.
According to some embodiments of the invention, the battery pack comprises a first battery pack and a second battery pack; the first storage battery pack and the second storage battery pack are connected in series; the first end of the first storage battery pack and the first end of the second storage battery pack are both connected with the voltage signal acquisition module, the second end of the first storage battery pack is connected with the secondary side of the transformer, and the second end of the second storage battery pack is connected with the PWM control module; the storage battery pack is used for balancing and adjusting the load of the transformer.
According to some embodiments of the invention, the PWM control module comprises: the first photoelectric coupling unit is connected with the main control module and used for receiving a first control instruction sent by the main control module; the control unit is connected with the first photoelectric coupling unit and used for receiving a fourth control instruction sent by the first photoelectric coupling unit; and the first switch control unit is respectively connected with the control unit, the secondary side of the transformer and the negative electrode of the second storage battery pack and is used for receiving a fourth control instruction sent by the control unit and sending the PWM control instruction.
According to some embodiments of the present invention, the first photoelectric coupling unit comprises: the first resistor first end is respectively connected with the main control module and the first photoelectric coupling device first end, the first photoelectric coupling device second end is grounded, the first photoelectric coupling device third end is connected with the first capacitor first end, and the first photoelectric coupling device fourth end is connected with the first capacitor second end.
According to some embodiments of the invention, the first switch control unit comprises: the first end of the second resistor is connected with the control unit, the second end of the second resistor is connected with the first end of the third resistor and the grid electrode of the first switch tube respectively, the source electrode of the first switch tube is connected with the first end of the fourth resistor and the first end of the fifth resistor respectively, the second end of the fourth resistor is connected with the control unit, and the second end of the third resistor and the second end of the fifth resistor are connected with the negative electrode of the second storage battery pack.
According to some embodiments of the present invention, the voltage signal acquisition module comprises:
the current detection unit is respectively connected with the first storage battery pack and the second storage battery pack and is used for monitoring the voltage signals of the first storage battery pack and the second storage battery pack;
and the operational amplification unit is respectively connected with the current detection unit and the main control module, and is used for receiving the voltage signal of the current detection unit, processing the voltage signal and outputting the processed voltage signal to the main control module.
According to some embodiments of the invention, the current detection unit comprises:
and a first end of the sixth resistor is connected with the storage battery pack, and a second end of the sixth resistor is connected with the operational amplification unit, and is used for determining whether to charge the first storage battery pack or the second storage battery pack according to the voltage signal on the sixth resistor.
According to some embodiments of the invention, the first drive module comprises: the second photoelectric coupling unit is respectively connected with the main control module and the positive electrode of the first storage battery pack, and is used for receiving a second control instruction of the main control module and sending a fifth control instruction according to the second control instruction; and the second switch control unit is respectively connected with the second photoelectric coupling unit and the transformer, is used for receiving a fifth control instruction sent by the second photoelectric coupling unit, and is switched on or switched off to be connected with the transformer according to the fifth control instruction.
According to the utility model discloses a some embodiments, second optoelectronic coupling unit includes seventh resistance, eighth resistance, first diode, second optoelectronic coupling device, seventh resistance first end is connected host system, seventh resistance second end is connected second optoelectronic coupling device first end, second optoelectronic coupling device second end is connected first diode positive pole, first diode negative pole ground connection, second optoelectronic coupling device third end is connected second on-off control unit, second optoelectronic coupling device fourth end is connected eighth resistance first end, eighth resistance second end is connected the positive pole of second storage battery.
An energy storage system according to an embodiment of the second aspect of the invention comprises at least one voltage equalizing device as described in the first aspect.
According to the utility model discloses energy storage system has following beneficial effect at least: the problem of voltage balancing of the battery pack in the energy storage system can be solved by configuring one or more voltage balancing devices in the energy storage system as in the first aspect, and balancing efficiency and reliability of the energy storage system are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a voltage equalizing device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a voltage equalizing device according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage equalizing device according to another embodiment of the present invention;
fig. 4 is a circuit diagram of a voltage equalizing device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a voltage equalizing device according to another embodiment of the present invention;
fig. 6 is a circuit diagram of a voltage equalizing device according to another embodiment of the present invention;
fig. 7 is a schematic diagram of a voltage equalizing device according to another embodiment of the present invention;
fig. 8 is a circuit diagram of a voltage equalizing device according to another embodiment of the present invention;
fig. 9 is a circuit diagram of a voltage equalizing device according to another embodiment of the present invention.
Reference numerals:
the driving circuit comprises a main control module 100, a PWM control module 200, a voltage signal acquisition module 300, a first driving module 400, a second driving module 500, a transformer 600, a first storage battery pack 700, a second storage battery pack 800, a first photoelectric coupling unit 201, a control unit 202, a first switch control unit 203, a current detection unit 301, an operational amplification unit 302, a second photoelectric coupling unit 401 and a second switch control unit 402.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, a schematic diagram of a voltage equalizing device according to an embodiment of the present invention is shown.
In some embodiments, the voltage equalizing device comprises: the system comprises a main control module 100, a PWM control module 200, a driving module, a voltage signal acquisition module 300 and a transformer 600; the main control module 100 is configured to receive a voltage signal and send a first control instruction according to the voltage signal; the PWM control module 200 is connected to the main control module 100, and is configured to receive the first control instruction sent by the main control module 100, execute the first control instruction, and then send out a PWM control instruction; the voltage signal acquiring module 300 is connected to the main control module 100, and is configured to provide a voltage signal to the main control module 100.
The driving module comprises a first driving module 400 and a second driving module 500, the first driving module 400 and the second driving module 500 are both connected with the main control module 100, and the first driving module 400 is used for receiving a second control instruction of the main control module 100 and sending a first driving instruction according to the second control instruction; the second driving module 500 is configured to receive a third control instruction of the main control module 100 and issue a second driving instruction according to the third control instruction.
The primary side of the transformer 600 is connected to the first driving module 400 and the second driving module 500, and is configured to receive the first driving instruction and the second driving instruction, respectively, and the secondary side of the transformer 600 is connected to the PWM control module 200, and is configured to receive the PWM control instruction.
This embodiment can transmit the voltage signal that the module 300 detected through the voltage signal and give main control module 100, main control module 100 gives PWM control module 200 through judging above-mentioned voltage signal and sending control command, main control module 100 also can send control command and give drive module simultaneously, control transformer 600's primary side through drive module, and control transformer 600's secondary side through PWM control module 200, thereby control transformer 600 charges for the undervoltage load, keep the equilibrium of electric quantity in the load, the realization principle of this implementation is simple, thereby balanced efficiency and reliability have been improved.
Referring to fig. 2, a schematic diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the voltage equalization apparatus further includes a battery pack including a first battery pack 700 and a second battery pack 800; the first storage battery pack 700 and the second storage battery pack 800 are connected in series, a first end of the first storage battery pack 700 and a first end of the second storage battery pack 800 are both connected with the voltage signal acquisition module 300, a second end of the first storage battery pack 700 is connected with a secondary side of the transformer 600, and a second end of the second storage battery pack 800 is connected with the PWM control module 200; the battery pack is a load for the transformer 600 to perform the balance adjustment.
It can be understood that the reason why the battery pack is divided into the first battery pack 700 and the second battery pack 800 in this embodiment because the equalization is performed by the equalization device in this embodiment only after a voltage difference occurs between the two battery packs, and the battery pack is divided into the first battery pack 700 and the second battery pack 800 can facilitate implementation of a design scheme of the cell equalization device.
Specifically, by connecting first battery pack 700 and second battery pack 800 in series, the positive electrode of first battery pack 700 may be denoted as B +, and the negative electrode of second battery pack 800 may be denoted as B-, according to the module structure in this embodiment, a loop may be formed in which first battery pack is connected to the secondary side of transformer 600 through B +, while the secondary side of transformer 600 is connected to PWM control module 200, and PWM control module 200 is connected to the negative electrode of second battery pack 800 through B-.
It can be understood that first battery pack 700 and second battery pack 800 in this embodiment can be regarded as battery packs connected in series, where first battery pack 700 is a battery pack that can be controlled by first driving module 400 to realize charging, and second battery pack 800 is a battery pack that can be controlled by second driving module 500 to realize charging. The battery pack can be regarded as a collection of series-connected single batteries.
More specifically, when the first storage battery pack 700 needs to be charged, the voltage signal is detected by the voltage signal acquisition module 300 and then transmitted to the main control module 100, and when the main control module 100 judges that the first storage battery pack 700 needs to start equalization according to the voltage signal, the MCU outputs a control signal first to enable the PWM control circuit 200; meanwhile, the main control module 100 sends a control signal to the first driving module 400 to charge the first battery pack 700 so as to achieve voltage equalization of the whole battery pack. If the voltage signal is judged to be abnormal, the circuit is abnormal, the output of the control signal is stopped, and the PWM control circuit 200 is forbidden to work.
More specifically, when the second storage battery pack 800 needs to be charged, the voltage signal is detected by the voltage signal acquisition module 300 and then transmitted to the main control module 100, and when the main control module 100 judges that the second storage battery pack 800 needs to start equalization according to the voltage signal, the MCU outputs a control signal first, so as to enable the PWM control circuit 200; meanwhile, the main control module 100 sends a control signal to the second driving module 500 to charge the second battery pack 800 so as to achieve voltage balance of the whole battery pack. If the voltage signal is judged to be abnormal, the circuit is abnormal, the output of the control signal is stopped, and the PWM control circuit 200 is forbidden to work.
In some embodiments, the specific number of the driving modules may be N, where N is an even number, N is equal to or greater than 2, and the N driving modules are all connected to the main control module 500, receive the control instruction of the main control module 500, and send a corresponding driving instruction according to the control instruction of the main control module 500 to drive a transformer connected to the driving module, and charge a corresponding portion of the battery pack through the transformer, so as to balance the battery pack. For example, the number of the driving modules is 2, the number of the corresponding storage battery pack is 1, the number of the primary coil of the transformer is 2:1:1, the driving modules, the storage battery pack and the transformer are in a number ratio of 2:1:1, the two driving modules respectively drive the 2 primary coils of the transformer, and after a magnetic field is generated between the primary side and the secondary side of the transformer, the secondary side of the transformer can drive the corresponding part of the storage battery to be charged, so that the voltage of the storage battery pack is balanced.
It will be appreciated that equalization within the battery is typically achieved by connecting a voltage acquisition module at the midpoint of the battery pack to equalize the sub-pack voltages on either side of the midpoint, thereby equalizing the voltage across the battery pack.
This embodiment can realize carrying out the design of drive module quantity according to concrete quantity according to practical application scene or storage battery, makes the embodiment of the utility model has more the practicality, makes its using value more extensive.
According to the embodiment, the main control module 100 can obtain the voltage data of the first storage battery pack 700 and the second storage battery pack 800 in the storage battery pack to determine whether to start the equalization, so that the judgment of the voltage equalization is more intelligent and reliable.
Referring to fig. 3, a schematic diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the PWM control module 200 includes:
the control system comprises a first photoelectric coupling unit 201, a control unit 202 and a first switch control unit 203, wherein the first photoelectric coupling unit 201 is connected with the main control module 100 and is used for receiving a first control instruction sent by the main control module 100; the control unit 202 is connected to the first photoelectric coupling unit 201 and configured to receive a fourth control instruction sent by the first photoelectric coupling unit 201; and the first switch control unit 203 is connected with the control unit 202, the secondary side of the transformer 600 and the negative electrode of the second battery pack 800, and is configured to receive the first control instruction sent by the control unit 202 and send a PWM control instruction.
In this embodiment, the PWM control module 200 can control the connection between the main control module 100 and the transformer 600 and the second battery pack, and can provide a PWM control command for the voltage balancing apparatus.
Referring to fig. 4, a circuit diagram of a voltage equalizing device according to an embodiment of the present invention is shown.
In some embodiments, the first photo coupling unit 201 includes: first resistance R1, first electric capacity C1, first optoelectronic coupling device U1, wherein, first resistance R1 first end is connected with main control module 100 and first optoelectronic coupling device U1 first end respectively, and first optoelectronic coupling device U1 second end ground, first optoelectronic coupling device U1 third end connection first electric capacity C1 first end, first optoelectronic coupling device U1 fourth end connection first electric capacity C1 second end.
The first switch control unit includes: the first switch tube Q1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5, the first end of the second resistor R2 is connected to the control unit 202, the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the gate of the first switch tube Q1, the source of the first switch tube Q1 is connected to the first end of the fourth resistor R4 and the first end of the fifth resistor R5, the second end of the fourth resistor R4 is connected to the control unit 202, and the second end of the third resistor R3 and the second end of the fifth resistor R5 are connected to the negative electrode of the second battery pack 800.
Specifically, the first control command output by the main control module 100 in fig. 4 passes through the first resistor R1 and the first photocoupler U1 through the terminal S0, and then passes through the filtering of the first capacitor C1 to enable or disable the main control chip U3 in the control unit 202 of the PWM control module, and when the terminal S0 is at a high level, the main control chip U3 is disabled, and when the terminal S0 is at a low level, the main control chip U3 is enabled; when the main control chip U3 is enabled, a PWM control signal is output from the OUT pin of the main control chip U3, the first switch Q1 is driven through the second resistor R2, the transformer 600 starts to operate, and the first battery pack 700 or the second battery pack 800 is charged.
In fig. 4, TRAN is the secondary side of the transformer, and B-is the negative electrode of second battery pack 800. When the first switching tube Q1 is turned on to perform PWM control, the current in the primary winding of the transformer 600 will change rapidly to generate induced electromotive force, creating a magnetic field, which is transmitted from the primary winding of the transformer to the secondary winding of the transformer, and the load connected to the secondary winding of the transformer is the battery pack in the above embodiment.
The present embodiment can implement a detailed circuit design inside the PWM control module, and implement control connection between the main control module 100 and the secondary side of the transformer through the above circuits, thereby providing necessary conditions for implementing voltage equalization.
Referring to fig. 5, a schematic diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the voltage signal acquiring module 300 includes: the battery pack voltage monitoring device comprises a current detection unit 301 and an operational amplification unit 302, wherein the current detection unit 301 is respectively connected with a first battery pack 700 and a second battery pack 800 and is used for monitoring the voltage signals of the first battery pack 700 and the second battery pack 800; and the operational amplification unit 302 is respectively connected with the current detection unit 301 and the main control module 100, and is configured to receive the voltage signal of the current detection unit 301, process the voltage signal, and output the processed voltage signal to the main control module 100.
It can be understood that, through the voltage signal output by voltage signal obtaining module 300, it can be determined whether first battery pack 700 needs to be charged or second battery pack 800 needs to be charged, when the voltage signal obtaining module 300 outputs a voltage between 2.5V and 4V, it indicates that first battery pack 700 needs to be charged, and when the voltage is between 0V and 2.5V, it indicates that second battery pack 800 needs to be charged.
Referring to fig. 6, a circuit diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the current detection unit includes:
and the first end of the sixth resistor is connected with the storage battery pack, and the second end of the sixth resistor is connected with the operational amplification unit and used for determining whether to charge the first storage battery pack or the second storage battery pack according to a voltage signal on the sixth resistor.
Specifically, the current detection function is realized by the voltage drop across sixth resistor R6, and when the current flows from battery pack intermediate node MID to ground, first battery pack 700 is charged, and when the current flows from ground to MID, second battery pack 800 is charged; when first battery pack 700 is charged, the voltage signal output from operational amplifier U4 is output through terminal S4, and when the voltage at terminal S4 is less than 2.048V, and when second battery pack 800 is charged, the voltage signal output from operational amplifier U4 is greater than 2.048V at terminal S4. It can be understood that the output terminal of the voltage signal terminal S4 is connected to the main control module 100, and the main control module 100 can determine the voltage value and 2.048V as the reference voltage VERF
The magnitude of the difference between the values, it is determined whether first battery pack 700 should be charged or second battery pack 800 should be charged.
Referring to fig. 7, a schematic diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the first driving module 400 includes: the second photoelectric coupling unit 401 and the second switch control unit 402, wherein the second photoelectric coupling unit 401 is respectively connected to the main control module 100 and the positive electrode of the first storage battery pack 700, and is configured to receive a second control instruction of the main control module 100 and send a fifth control instruction according to the second control instruction; the second switch control unit 402 is connected to the second photoelectric coupling unit 401 and the transformer 600, and configured to receive a fifth control instruction sent by the second photoelectric coupling unit 401, and turn on or turn off the connection with the transformer 600 according to the fifth control instruction.
Referring to fig. 8, a circuit diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the second photocoupling unit 401 includes a seventh resistor R7, an eighth resistor R8, a first diode D1, and a second photocoupler U2, wherein a first end of the seventh resistor R7 is connected to the main control module 100, a second end of the seventh resistor R7 is connected to a first end of the second photocoupler U2, a second end of the second photocoupler U2 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is grounded, a third end of the second photocoupler U2 is connected to the second switch control unit 402, a fourth end of the second photocoupler U2 is connected to the first end of the eighth resistor R8, and a second end of the eighth resistor R8 is connected to the positive electrode of the second battery pack 800.
Specifically, a control signal sent by the main control module 100 is sent through the terminal S1, when the terminal S1 is at a high level, the second photocoupler U2 is turned on, the second switching tube Q2 is controlled by the terminal U2 and is also turned on to charge the first battery pack 700, where the terminal B + is connected to the positive electrode of the first battery pack 700, and the terminal TRAN2 is a primary side connection point where the transformer 600 is connected to the first driving module 400.
Referring to fig. 9, a circuit diagram of a voltage equalizing device according to another embodiment of the present invention is shown.
In some embodiments, the second driving module 500 has the same principle as the first driving module 400, the control signal sent by the main control module 100 is sent through the terminal S2, when the terminal S2 is at a high level, the third photocoupler U3 is turned on, the third switching tube Q3 is controlled by the third photocoupler U3 and is also turned on to charge the second battery pack 800, wherein the terminal B-represents a negative electrode of the second battery pack 800, and the terminal TRAN3 is a primary side connection terminal of the transformer 600 connected to the second driving module 500.
It is to be understood that the above-described embodiment charges first battery pack 700 with a circuit in which terminal B + passes through first battery pack 700 to terminal MID to ground GND to primary terminal TRAN2 of transformer 600; the charging circuit for second battery pack 800 is grounded GND to terminal MID to second battery pack 800 to second drive circuit 500 to primary terminal TRAN3 of transformer 600.
The switching tube in the above embodiments may be a MOS tube or other switching device, which is not limited in the embodiments of the present invention.
In some embodiments, an energy storage system is provided, which includes at least one voltage equalization device as described above, and can solve the problem of voltage equalization of battery packs in the energy storage system by configuring one or more voltage equalization devices as in the first aspect in the energy storage system, thereby improving equalization efficiency and reliability of the energy storage system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. Voltage equalizing device, characterized in that includes:
the voltage signal acquisition module is used for acquiring a voltage signal of the storage battery pack;
the main control module is connected with the voltage signal acquisition module and used for receiving the voltage signal sent by the voltage signal acquisition module and generating a first control instruction, a second control instruction and a third control instruction according to the voltage signal;
the PWM control module is connected with the main control module and used for receiving the first control instruction sent by the main control module and sending a PWM control instruction after executing the first control instruction;
the driving module comprises a first driving module and a second driving module, the first driving module and the second driving module are both connected with the main control module, and the first driving module is used for receiving the second control instruction sent by the main control module and sending a first driving instruction according to the second control instruction; the second driving module is used for receiving the third control instruction sent by the main control module and sending a second driving instruction according to the third control instruction;
the primary side of the transformer is connected with the first driving module and the second driving module respectively and used for receiving the first driving instruction and the second driving instruction respectively, the secondary side of the transformer is connected with the PWM control module and used for receiving the PWM control instruction, the secondary side of the transformer is further connected with the central point of the storage battery pack, and the primary side of the transformer is driven through the first driving instruction and/or the second driving instruction so that the secondary side of the transformer charges one part of the corresponding storage battery pack and the voltage of the storage battery pack is balanced.
2. The voltage equalizing apparatus of claim 1, wherein the battery pack comprises a first battery pack and a second battery pack;
the first storage battery pack and the second storage battery pack are connected in series;
the first end of the first storage battery pack and the first end of the second storage battery pack are both connected with the voltage signal acquisition module, the second end of the first storage battery pack is connected with the secondary side of the transformer, and the second end of the second storage battery pack is connected with the PWM control module;
the storage battery pack is used for balancing and adjusting the load of the transformer.
3. The voltage equalizing device of claim 2, wherein the PWM control module comprises:
the first photoelectric coupling unit is connected with the main control module and used for receiving a first control instruction sent by the main control module;
the control unit is connected with the first photoelectric coupling unit and used for receiving a fourth control instruction sent by the first photoelectric coupling unit;
and the first switch control unit is respectively connected with the control unit, the secondary side of the transformer and the negative electrode of the second storage battery pack and is used for receiving a fourth control instruction sent by the control unit and sending the PWM control instruction.
4. The voltage equalizing device of claim 3, wherein the first photocoupling unit comprises:
the first resistor first end is respectively connected with the main control module and the first photoelectric coupling device first end, the first photoelectric coupling device second end is grounded, the first photoelectric coupling device third end is connected with the first capacitor first end, and the first photoelectric coupling device fourth end is connected with the first capacitor second end.
5. The voltage equalizing device of claim 3, wherein the first switch control unit comprises:
the first end of the second resistor is connected with the control unit, the second end of the second resistor is connected with the first end of the third resistor and the grid electrode of the first switch tube respectively, the source electrode of the first switch tube is connected with the first end of the fourth resistor and the first end of the fifth resistor respectively, the second end of the fourth resistor is connected with the control unit, and the second end of the third resistor and the second end of the fifth resistor are connected with the negative electrode of the second storage battery pack.
6. The voltage equalizing device of claim 2, wherein the voltage signal obtaining module comprises:
the current detection unit is respectively connected with the first storage battery pack and the second storage battery pack and is used for monitoring the voltage signals of the first storage battery pack and the second storage battery pack;
and the operational amplification unit is respectively connected with the current detection unit and the main control module, and is used for receiving the voltage signal of the current detection unit, processing the voltage signal and outputting the processed voltage signal to the main control module.
7. The voltage equalizing device of claim 6, wherein the current detecting unit comprises:
and a first end of the sixth resistor is connected with the storage battery pack, and a second end of the sixth resistor is connected with the operational amplification unit, and is used for determining whether to charge the first storage battery pack or the second storage battery pack according to the voltage signal on the sixth resistor.
8. The voltage equalizing device of claim 2, wherein the first driving module comprises:
the second photoelectric coupling unit is respectively connected with the main control module and the positive electrode of the first storage battery pack, and is used for receiving a second control instruction of the main control module and sending a fifth control instruction according to the second control instruction;
and the second switch control unit is respectively connected with the second photoelectric coupling unit and the transformer, is used for receiving a fifth control instruction sent by the second photoelectric coupling unit, and is switched on or switched off to be connected with the transformer according to the fifth control instruction.
9. The voltage equalizing device of claim 8, wherein the second optocoupler includes a seventh resistor, an eighth resistor, a first diode, and a second optocoupler, wherein a first end of the seventh resistor is connected to the main control module, a second end of the seventh resistor is connected to a first end of the second optocoupler, a second end of the second optocoupler is connected to an anode of the first diode, a cathode of the first diode is grounded, a third end of the second optocoupler is connected to the second switch control unit, a fourth end of the second optocoupler is connected to a first end of the eighth resistor, and a second end of the eighth resistor is connected to an anode of the second battery pack.
10. Energy storage system, characterized in that it comprises at least one voltage equalizing device according to any one of claims 1-9.
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| CN202021434340.2U CN213521317U (en) | 2020-07-20 | 2020-07-20 | Voltage balancing device and energy storage system |
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