A user-side electric quantity hybrid type high-efficiency storage-discharge energy-saving power supply device and method

Abstract

The application discloses a user-side electricity hybrid type efficient storage and discharge energy-saving power supply device and method. The device comprises an external power supply side power supply, a series ion battery pack, a section energy continuation charger, a unit cell state of charge equalization energy source, a nested double cycle scanning signal generator, a battery pack working condition detection module, an electricity switching controller and an inverter. By cutting off the connection between the external power supply side power supply and the load, the electricity of the external power supply side power supply and the electricity of the ion battery pack are fused into a new type of composite power supply. The section energy continuation charger and the unit cell state of charge equalization energy source respectively perform energy injection and state of charge equalization on the section battery pack and the unit cell. The signal generator provides accurate control signals to complete the dynamic control of energy injection and state of charge equalization of the external power supply side power supply to the series ion battery pack. The application greatly saves power resources through the energy fusion between the dynamic of the external power supply side power supply and the ion battery pack.

Description

Technical Field

[0001] This application relates to the field of power energy conservation technology, and in particular to a user-side power hybrid high-efficiency energy storage and discharge energy-saving power supply device and method. Background Technology

[0002] The current power supply mode on the consumer side generally involves directly downloading electricity from the grid or other power systems to provide power to the load. This power supply mode has been used for a century since the invention of alternating current, and its power supply theory, technology and methods have been solidified for many years without any changes or breakthroughs. The chemical energy storage technology that has emerged in recent years is still limited to the superficial replacement of chemical energy with conventional electricity at different times. It has not touched the deep penetration and integration between conventional electricity and chemical energy storage devices (such as batteries) in an electrochemical sense. The two types of power sources still belong to the original technical categories and maintain their own inherent characteristics. Due to this limitation, there is still a lot of room for improvement and development in terms of power transmission efficiency, electricity cost per kilowatt-hour and economic benefits of existing power sources, which needs to be innovated and broken through. Summary of the Invention

[0003] Based on this, the embodiments of this application provide a user-side hybrid high-efficiency energy-saving power supply device and method for energy storage and discharge. This method can break the boundaries between traditional power supply modes and chemical energy technologies, deeply integrate the power supply on the power supply side with the power of the ion battery pack to form a new type of synthetic power supply, construct a distributed power consumption side high-efficiency energy-saving power supply system, greatly reduce the power supply burden on the power supply side, save electrical energy, and significantly reduce the electricity cost on the user side.

[0004] In a first aspect, a user-side hybrid high-efficiency energy-saving power supply device is provided. This device disconnects the direct connection between the external power supply and the power consumption side, and is installed between the external power supply and the power load. The device includes an external power supply, a series-connected lithium-ion battery pack, a segmented energy charger, a unit battery state-of-charge balancing energy source, a nested dual-cycle scanning signal generator, a battery pack operating condition detection module, a power switching controller, and an inverter, wherein:

[0005] External power supply is used to provide basic electrical energy;

[0006] A series-connected lithium-ion battery pack is divided into multiple battery segments, each containing multiple cell units for storing and releasing electrical energy.

[0007] The section-type rechargeable charger has its input end connected to the external power supply and its output end connected to each section of the battery pack. It is used to convert the electrical energy of the external power supply into rechargeable energy and inject it into the corresponding section of the battery pack during the process of the device supplying power to the load.

[0008] The unit battery state-of-charge equalization energy source has its input end connected to the external power supply and its output end connected to each unit battery. It is used to convert the external power supply into balanced energy and inject it into the corresponding unit batteries during the process of the device supplying power to the load, thereby balancing the state of charge of the unit batteries.

[0009] The nested dual-cycle scanning signal generator is used to generate the section-based energy-saving cycle scanning control signal and the unit battery state-of-charge equalization cycle scanning control signal, control the working status of the section-based energy-saving charger and the unit battery state-of-charge equalization energy source, and change the mode of the cycle scanning signal according to the changes in electrical parameters of the energy-saving power supply device during operation.

[0010] The battery pack operating condition detection module is used to detect the voltage status of the series-connected lithium battery pack during operation, and compare and identify the voltage detection value with the two judgment benchmark voltage values ​​of termination charge mixing and recovery charge mixing. Based on the judgment result, it sends the corresponding request and conversion switching command to the power switching controller and the nested dual-cycle scanning signal generator in the energy-saving power supply device.

[0011] The power switching controller is a key component connecting the external power supply, the series-connected lithium battery pack, the inverter, and the electrical load. It is used to change the connection relationship between the two power supplies and the inverter's electrical load according to different switching request signals issued by the battery pack condition detection module. At the same time, it sends signal mode conversion instructions to the nested dual-cycle scanning signal generator to divide the operation of the energy-saving power supply device into a power mixing stage and an energy recovery stage.

[0012] An inverter, connected to a power switching controller, is used to convert the DC power of a series-connected lithium-ion battery pack into AC power to supply AC loads on the power consumption side.

[0013] Optionally, the segmented rechargeable charger includes multiple charger units, each connected to a segmented battery pack, for converting the voltage of the external power supply to a charging voltage suitable for that segmented battery pack. Each rechargeable charger is equipped with a charging start / stop control terminal. During the power mixing phase, it receives a segmented rechargeable cycle scanning signal from a nested dual-cycle scanning signal generator, periodically taking over the power supply function of the corresponding segmented battery pack to the load, and simultaneously recharges that segmented battery pack. During the energy recovery phase, it receives a static charging signal from a nested dual-cycle scanning signal generator, and uses the rechargeable charger to continuously charge each segmented battery pack for energy recovery.

[0014] Optionally, the cell state-of-charge balancing energy source unit includes multiple balancing control units. Each balancing control energy source is connected to the corresponding cell and is used to receive cell state-of-charge balancing scan signals from the dual-cycle scan signal generator during charge mixing. It converts the external power supply into balancing energy suitable for the cell and balances the state of charge of each cell under the control of the balancing signal from the nested dual-cycle scan signal generator. Each balancing energy source is equipped with a segment selection signal control terminal to ensure the synchronization of energy injection between each segment of the battery pack and each cell in the same segment. During the energy recovery phase, the state scanning balancing of each cell will be stopped.

[0015] Optionally, the nested dual-cycle scanning signal generator generates a segmented energy-supply cycle scanning control signal and a unit battery state-of-charge balancing cycle scanning control signal. The two scanning signals maintain a nested logical relationship in terms of timing, that is, there are several state-of-charge balancing control cycles within a segmented energy-supply control cycle. While each segment of the battery pack is being charged, the state of charge of each unit battery in the same segment is scanned and balanced. During the operation of the device, the signal of the nested dual-cycle scanning signal generator is divided into a dynamic energy-supply control mode in the energy mixing stage or a static charging mode in the energy recovery stage according to the conversion command sent by the power switching controller.

[0016] Optionally, the voltage of each battery segment is fed into the battery pack condition detection module. The module has two judgment reference voltages: termination of charge mixing and restoration of charge mixing. The battery pack condition detection module compares the terminal voltage of each battery segment in the series-connected lithium battery pack with the two set judgment reference voltages in real time. When the measured voltage matches one of the set judgment reference voltages, it sends a corresponding switching request signal to the charge switching controller.

[0017] Optionally, the power switching controller is equipped with an input terminal for the external power supply and the series-connected lithium battery pack, a DC power supply terminal for the inverter, an output terminal for the external power supply, and a cyclic scanning signal mode conversion command sending terminal. When the power switching controller receives the termination power mixing request signal sent by the battery pack operating condition detection module, the power switching controller will cut off the power supply from the series-connected lithium battery pack to the inverter, and connect the input terminal and the output terminal of the external power supply, so that the external power supply directly supplies power to the load.

[0018] Optionally, upon receiving the termination of charge mixing request signal from the battery pack condition detection module, the power switching controller sends a signal mode conversion command to the nested dual-cycle scanning signal generator. The nested dual-cycle scanning signal generator stops sending the cell battery state of charge equalization control cycle scanning control signal and changes the segment power supply control signal from dynamic cycle scanning to a non-scanning full-charge state. Each segment of the battery pack stops supplying power to the load and enters the steady-state charging stage of the power supply charger. When the voltage of each segment of the battery pack rises back to the set recovery charge mixing judgment reference voltage value, the battery pack condition detection module sends a recovery charge mixing switching request signal to the power switching controller. The power switching controller restores the output relationship of the two types of charge to the connection state of the charge mixing stage. At the same time, the nested dual-cycle scanning signal generator returns to the nested dynamic scanning mode and starts a new round of charge mixing cycle operation.

[0019] Optionally, the device also includes a communication module for data communication with external devices to enable remote monitoring and control functions.

[0020] In a second aspect, a user-side power hybrid high-efficiency storage and discharge energy-saving power supply method is provided, which is applied to any of the devices in the first aspect above. The method includes: converting the external power supply to provide power to the user-side load in an indirect manner.

[0021] Under the signal control of a nested dual-cycle scanning signal generator, the conventional external power supply and the chemical power of a series-connected ion battery pack are integrated into a novel synthetic power source.

[0022] The series-connected lithium battery pack is divided into multiple battery segments, each containing multiple cell units. The voltage of the external power supply is converted into a voltage suitable for charging each battery segment by the segment power supply charger. Under the control of the segment power supply cycle scanning signal, each battery segment is charged sequentially. During the power supply charging period, each power supply charger periodically takes over the power supply to the load from the corresponding battery segment.

[0023] The unit battery state of charge balancing energy source converts the electrical energy from the external power supply into energy suitable for balancing each unit battery, and performs state of charge balancing on each unit battery under the control of the unit battery state of charge balancing cyclic scanning control signal.

[0024] By using the segmented energy-supplying cyclic scanning control signal and the unit battery state-of-charge balancing cyclic scanning control signal generated by the nested dual cyclic scanning signal generator, the energy-supplying chargers of each segment and the state-of-charge balancing energy source of each unit battery inject and balance energy into each segment battery pack and unit battery, thereby realizing the dynamic energy fusion between the external power supply and the lithium battery pack.

[0025] The battery pack condition monitoring module monitors the voltage status of each battery pack section in real time. Based on a comparison with the set judgment reference voltage value, it works in conjunction with the power switching controller to divide the operation of the energy-saving power supply device into two stages: power mixing and energy recovery. In the power mixing stage, the power switching control module connects the combined power supply, consisting of an external power supply and a series-connected lithium-ion battery pack, to the DC power input of the inverter, which then converts it into AC power to supply the load. In the energy recovery stage, the power controller cuts off the power supply from the combined power supply to the inverter and supplies the external power supply to the load directly. During the energy recovery period, the series-connected lithium-ion battery pack receives continuous charging from the rechargeable charger. When the voltage of the lithium-ion battery pack rises to the power mixing judgment reference voltage, the energy-saving power supply device enters a new round of operation under the joint control of the battery pack condition monitoring module and the power switching controller.

[0026] The beneficial effects of the technical solutions provided in this application include at least the following:

[0027] Based on in-depth research and extensive experiments on ion battery theory, this application dynamically integrates the charge of the ion battery pack with external power. Through external energy control technology, it interferes with and optimizes the internal electrochemical reaction process of the ion battery. The resulting novel synthetic power supply significantly improves the energy transfer efficiency between the external power supply and the ion battery, fully leveraging the energy leverage of the external power supply. The optimized ion battery and the external power supply complement each other. Under the same energy output, the total amount of electricity provided by the synthetic power supply to the load and the amount of electricity absorbed by the ion battery during charging is significantly less than the power consumption of the external power supply under standalone power supply conditions. The hybrid power supply device is modularly embedded between the external power supply and the load, achieving a power saving rate of at least 30% under the same load. The specific degree of power saving depends on controlling the integration depth of the external power supply with the series-connected ion battery pack. Attached Figure Description

[0028] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0029] Figure 1 An electrical principle block diagram of a hybrid power storage and discharge energy-saving power supply device provided in this application embodiment;

[0030] Figure 2A flowchart illustrating a hybrid power storage and discharge energy-saving power supply method provided in this application embodiment. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0032] In the description of this application, the terms “comprising,” “having,” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may also include other steps or units that are not expressly listed but are inherent to these processes, methods, products, or apparatuses, or steps or units added based on further optimizations conceived in this application.

[0033] This application discloses a hybrid power supply technology and device for high-efficiency energy storage and discharging, including an external power supply, a series-connected lithium-ion battery pack, a segmented rechargeable charger, a unit battery state-of-charge balancing energy source, a nested dual-cycle scanning signal generator, a battery pack operating condition detection module, a power switching controller, and an inverter. The hybrid power supply technology and device are modularly integrated into and replace existing direct power supply systems.

[0034] This patent relates to a hybrid energy-efficient power supply technology and device, which combines grid power or other external power sources with the chemical energy of an ion battery to form a hybrid power source. The series-connected ion battery group is divided into m segment battery groups, each containing n unit batteries. Each segment battery group and each unit battery within a group is connected to its corresponding segment power supply charger and unit battery state-of-charge balancing energy source, forming a two-level energy control mode. A nested dual-cycle scanning signal generator sends nested power supply and balancing cyclic scanning control signals to the segment battery groups and unit batteries. After conversion by the segment power supply charger and unit battery state-of-charge balancing energy source, the external power supply energy is converted into... The energy is injected into each section of the battery pack and each unit battery. Dynamic scanning control technology is used to change and optimize the electrochemical reaction process inside the ion battery, suppress the inherent negative effects of the ion battery during discharge, and improve the energy release level of the ion battery. The ion battery pack under the excitation of the external power supply side forms an energy complementary synthetic power source with energy efficiency characteristics superior to conventional batteries. The battery pack operating condition detection module and the power switching controller are combined to automatically switch the connection relationship and operating mode between the two types of power according to the state of the internal operating parameters of the energy-saving power supply device. The energy-saving control device is introduced into two different operating stages: power mixing and energy recovery. This realizes the rational allocation and utilization of the two types of power resources and maintains the long-term stable operation of the energy-saving power supply device.

[0035] The power mixing device is plugged into the external power supply and the load in a modular form. During the power mixing stage, the synthesized new power is converted by the inverter to supply power to the load. During the energy recovery stage, while the external power supply is directly supplying power to the load, it statically charges the series-connected lithium battery pack to restore the energy of the lithium battery pack.

[0036] Specifically, the hybrid energy storage and discharge power supply device provided in this application embodiment may include an external power supply, a series-connected lithium-ion battery pack, a segmented rechargeable charger, a unit battery state-of-charge balancing energy source, a nested dual-cycle scanning signal generator, a battery pack operating condition detection module, a power switching controller, and an inverter, wherein:

[0037] External power supply is used to provide basic electrical energy;

[0038] A series-connected lithium battery pack consists of m battery segments, each containing n individual cells, used for storing and releasing electrical energy.

[0039] The section-level power supply charger connects to the external power supply and each section of the battery pack, and is used to convert the electrical energy from the external power supply and inject it into the corresponding section of the battery pack.

[0040] The unit cell state-of-charge equalization energy source is connected to the external power supply and each unit cell to optimize the state of charge of the unit cells.

[0041] Nested dual-cycle scanning signal generator is used to generate sectional energy continuation cycle scanning control signals and unit battery state of charge balancing cycle scanning control signals to control the operation of sectional energy continuation charger and unit battery state of charge balancing energy source.

[0042] The battery pack condition detection module is used to monitor the voltage status of each section of the battery pack in real time during operation. The module has two judgment reference voltages: termination of power mixing and resumption of power mixing. During the operation of the energy-saving power supply device, the battery pack condition detection module compares and identifies the terminal voltage of each section of the battery pack with the above two judgment reference voltage values. When the voltage setting conditions are met, the module sends a corresponding switching request signal to the power switching controller.

[0043] The power switching controller is connected to the external power supply, the series-connected lithium battery pack, the inverter, and the electrical load. It is used to respond to the switching request signal sent by the battery pack condition detection module, change the power supply connection relationship between the two types of power, and send instructions to the nested dual-cycle scanning signal generator to change the signal mode, guiding the energy-saving power supply device into two different operating stages: the power mixing stage and the energy recovery stage.

[0044] The inverter, connected to the DC power supply terminal of the power switching controller, is used to convert the DC power of the synthesized power supply into AC power to meet the power supply requirements of the AC load on the power consumption side.

[0045] In this embodiment, energy control technology is used to dynamically fuse and complement the power from the external power supply and the series-connected lithium-ion battery pack, forming a high-efficiency combined power source and saving energy from the external power supply. The series-connected lithium-ion battery pack consists of m*n unit cells connected in series, divided into m battery segments. Each battery segment contains n unit cells. The positive and negative terminals of each battery segment are connected to the corresponding battery segment charger. Each unit cell within each battery segment is connected to the corresponding state-of-charge equalization energy source, forming a two-stage energy control structure.

[0046] The operation of the energy-saving power supply device is divided into two stages: power mixing and energy recovery. In the power mixing stage, the nested cyclic scanning controller generates and sends dual cyclic scanning control signals for power continuation and balancing according to the nested logic control relationship set by the system, and injects the power of the external power supply into the section battery pack and the unit battery respectively. In the energy recovery stage, the nested dual cyclic scanning signal generator changes the section power continuation cyclic scanning signal into a static charging signal output, driving each power continuation charger to continuously charge each section battery pack at the same time.

[0047] The output terminals of m segment rechargeable chargers are connected to the corresponding segment battery packs. Each rechargeable charger is equipped with a charging start / stop control terminal, which receives the segment rechargeable cycle scanning signal sent by the nested dual cycle scanning signal generator, converts the external power supply to the applicable voltage, and takes over the power supply to the load of the corresponding segment battery pack in a time-sharing manner according to the cycle scanning method. During the power supply replacement period, it also charges the segment battery pack.

[0048] Each battery cell in each section is connected to its corresponding cell state-of-charge (CBC) balancing energy source. Each balancing energy source is equipped with a CBC start / stop control terminal and a section selection signal receiver. External power supply is converted into balancing energy by the cell CBC balancing energy source. During the charge mixing phase, under the dual control of the cell CBC balancing cyclic scanning signal and the section energy recovery scanning signal, the cell CBC balancing energy source injects balancing energy into each cell cell in the same section. During the energy recovery phase, the above-mentioned balancing energy scanning control is in a stopped state.

[0049] The battery pack condition detection module monitors the voltage parameters of the battery pack in the section in real time, and sends a switching command to the power switching controller when the set conditions are met. The power switching controller responds to the switching request signal to switch the output relationship between the two power sources, and changes the overall operating mode of the power saving device by changing the form of sending the cyclic scanning signal.

[0050] Specifically, the battery pack condition monitoring module internally sets a reference voltage value for terminating charge mixing and a reference voltage value for restoring charge mixing. When the energy-saving power supply device supplies power to the load, the voltage of the series-connected lithium-ion battery pack gradually decreases. The battery pack condition monitoring module compares the terminal voltage of each section of the series-connected lithium-ion battery pack with the preset reference voltage value for terminating charge mixing in real time. When the terminal voltage of any section of the battery pack matches the preset reference voltage value for terminating mixing, the battery pack condition monitoring module sends a request signal to the charge switching controller to terminate charge mixing. After receiving the signal, the charge switching controller switches the connection relationship of the two types of charge output, cutting off the DC power supply from the series-connected lithium-ion battery pack to the inverter and connecting the external power supply to the load. The system directly supplies power to the battery pack and simultaneously sends a command to the nested dual-cycle scanning signal generator to change the cyclic scanning signal mode. The nested dual-cycle scanning signal generator converts the dynamic energy-saving cyclic scanning signal into a static charging signal and stops balancing the state of each battery unit. The energy-saving power supply device then enters the energy recovery phase. Subsequently, each energy charger continuously charges each energy-saving battery pack, and the terminal voltage of each battery pack gradually increases. When the terminal voltage of each battery pack reaches the benchmark voltage value for restoring the mixed charge, the battery pack condition detection module sends a request signal to the charge switching controller to restore the mixed charge state. The charge switching controller restores the output connection relationship of the two charges and the signal mode of the nested dual-cycle scanning signal to the mixed charge state, starting the next cycle. The mixed charge stage and the energy recovery stage constitute a basic energy control cycle, which automatically cycles periodically and operates stably for a long time.

[0051] The nested cyclic scanning controller maintains a nested logical relationship in timing between the segment power supply cyclic scanning control signal and the unit battery state of charge balancing cyclic scanning control signal. That is, each segment power supply control cycle contains n battery state of charge balancing cyclic scanning control signals. The segment power supply signal has a gating control function for the state of charge balancing of unit batteries in the same segment. That is, the energy balancing of the state of charge of each unit battery in the same segment is limited to the power supply cycle of the same segment battery pack.

[0052] The following uses a hybrid high-efficiency energy-saving power supply device consisting of grid power and lithium battery pack power as an example to illustrate the specific implementation method of this application. The specific circuit diagram is shown below. Figure 1 .

[0053] This example uses a series battery pack consisting of 32 individual cells, divided into 8 battery segments. Each battery segment contains 4 individual cells. The power input terminals of the segment rechargeable chargers XC1 to XC8 are connected to the external power grid. The DC output terminals +Vc and -Vc of each segment rechargeable charger are connected to the series nodes of their respective battery segments. Each segment rechargeable charger has recharge start / stop control terminals K1 to K8. A nested dual-cycle scan controller generates 8-bit segment recharge cycle scan control signals X1 to X8, and these 8 cycle scan control signal lines are connected to the recharge start / stop control terminals K1 to K8 on the 8 segment rechargeable chargers. A nested dual-cycle scan signal generator generates equalization scan signals P1 to P4, and these 4 equalization scan signals are connected to the signal receiving terminals P1 to P4 on the equalization energy controller CDU of each individual cell. The following uses the first battery segment as an example to illustrate the two-stage energy control process:

[0054] The DC output voltage of the rechargeable charger is higher than the terminal voltage of the battery pack in the section. The period of a section's recharge cycle scan signal is T. Under the control of the section's recharge cycle scan control signal, the rechargeable charger takes over the supply of power to the load and charges the corresponding battery pack during the charging period of the corresponding section's battery pack. Each section contains 4 unit batteries, and each unit battery is connected to a corresponding set of unit battery state-of-charge balancing energy sources. Each balancing energy source consists of an AC / DC converter and a balancing energy controller (CDU). A nested dual-cycle scan signal generator sends 4 channels of state-of-charge balancing cycle scan control signals P1 to P4 to the balancing energy control signal receivers of the 4 unit battery state-of-charge balancing energy sources in this section's battery pack. The period of each scan control signal is 1 / 4 of the section's recharge scan period. The 4 capacitor charge / discharge controllers (CDU1.1 to CDU1.4) are respectively connected to the unit battery energy balancing scan signal. Under control, the energy from the AC / DC converter is first stored in the capacitor. After energy storage is completed, CDU1.1 to CDU1.4 will issue energy release control signals to inject the energy stored in the capacitor into the corresponding cell unit. CDU1.1 to CDU1.4 are also equipped with a segmented energy recovery scanning signal receiver. The segmented energy recovery scanning control signal is used as a selection signal to ensure that within one energy recovery scanning cycle, the four cells in the same segment receive energy scanning injection from their respective cell state of charge balancing energy sources in a time-sharing manner. When the energy recovery cycle of a segment of the battery pack ends, the nested dual-cycle scanning signal generator moves the energy recovery cycle scanning control signal to the next energy recovery charger. The cell state of charge balancing cycle scanning signal is then output again from P1 to P4 to start the next round of segmented battery pack energy recovery and the state of charge energy scanning balancing of the cells in the same segment. This cycle repeats until the end of the entire power mixing control process.

[0055] The voltages V1 to V8 of each battery segment are connected to the voltage input terminal of the battery pack condition detection module. The battery pack condition detection module detects the terminal voltage of each battery segment and compares it with the reference voltage for terminating charge mixing. When the terminal voltage of any battery segment is lower than the set reference voltage for terminating charge mixing, the QH1 terminal of the battery pack condition detection module sends a request signal to terminate charge mixing. After receiving the request signal from the battery pack condition detection module, the charge switching controller cuts off the power supply from the combined power supply to the inverter power output terminals Vnb+ and Vnb-, and connects the external power input terminal Viac to the external power output terminal Voac, allowing the external power supply to directly power the load. At the same time, the MS terminal on the charge switching controller sends a signal mode conversion command to the nested dual-cycle scanning signal generator. After receiving this command, the nested dual-cycle scanning signal generator sets all the state-of-charge balance scanning signals P1 to P4 of the unit battery to 0. The state-of-charge (SOC) balancing scan of each battery unit stops, and the sustain signals X1 to X8 exit the cyclic scan state and are all set to 1. The cyclic scan sustain state switches to the static full-charge mode for each sustain battery pack, and the energy-saving power supply device enters the energy recovery stage. During this stage, the terminal voltage of each battery pack gradually rises. When the terminal voltage of each battery pack rises to the set power recovery mixing judgment benchmark value, the battery pack condition detector sends a power mixing recovery request signal to the power switching controller. The power switching controller closes the channel between the external power input terminal Viac and the external power output terminal Voac, and restores the power supply from the combined power output terminals Vnb+ and Vnb- to the DC power input terminal of the inverter. At the same time, it removes the signal mode conversion command to the nested dual cyclic scan signal generator. The nested dual cyclic scan signal generator switches from the static charging state to the dual cyclic scan state of the power mixing stage, and the power mixing type energy-saving power supply device re-enters the power mixing stage.

[0056] Please refer to Figure 2 This application illustrates a hybrid power storage and discharge energy-saving power supply method provided by an embodiment of this application. The method may include:

[0057] S1: Disconnect the direct connection between the original external power supply system and the load, and convert the external power supply to provide power to the load indirectly;

[0058] S2: The electrical charge of the external power supply and the chemical charge of the ion battery are fused into a novel synthetic power source under the control described in this application;

[0059] S3: The series-connected ion battery pack is divided into two energy-controlled levels: the segment battery pack and the unit battery, and each receives its own energy injection.

[0060] S4: Nested dual-cycle scanning signal generator generates segment battery pack energy-saving scanning control signal and unit battery state-of-charge equalization scanning control signal;

[0061] S5: The external power supply is converted into energy by the energy chargers in each section, and the energy is injected into the battery pack in each section under the control of the energy cycle scanning signal.

[0062] S6: The external power supply is converted into energy by the state-of-charge balancing energy source of each cell battery, and the balancing energy is injected into each cell battery under the control of the state-of-charge balancing scan signal.

[0063] S7: The battery pack condition detection module detects the terminal voltage of each section of the battery pack. When the terminal voltage meets the two different judgment reference voltage values ​​of termination of power mixing or resumption of power mixing set inside the energy-saving power supply device, it sends the corresponding switching request signal to the power switching controller.

[0064] S8: The power switching controller changes the connection relationship between the two power sources according to the switching request signal, and at the same time changes the signal sending mode of the nested cyclic scanning signal generator according to the switching request signal, guiding the energy-saving power supply device into two different stages: power mixing and energy recovery.

[0065] S9: The two complementary hybrid structures significantly improve the energy efficiency of the synthesized power supply and greatly save power resources on the external power supply side.

[0066] Specifically, when applied to the aforementioned apparatus, the implementation method of this application is as follows:

[0067] Under the signal control of a nested dual-cycle scanning signal generator, the conventional external power supply and the chemical power of a series-connected ion battery pack are integrated into a novel synthetic power source.

[0068] The series-connected lithium battery pack is divided into multiple battery segments, each containing multiple cell units. The voltage of the external power supply is converted into a voltage suitable for charging each battery segment by the segment power supply charger. Under the control of the segment power supply cycle scanning signal, each battery segment is charged sequentially. During the power supply charging period, each power supply charger periodically takes over the power supply to the load from the corresponding battery segment.

[0069] The unit cell state of charge balancing energy source converts the electrical energy from the external power supply into energy suitable for balancing each unit cell, and performs state of charge balancing on each unit cell under the control of the unit cell state of charge balancing cyclic scanning signal.

[0070] By using the segmented energy-supplying cyclic scanning control signal and the unit battery state-of-charge balancing cyclic scanning control signal generated by the nested dual cyclic scanning signal generator, the energy-supplying chargers of each segment and the state-of-charge balancing energy source of each unit battery are controlled to dynamically inject and balance energy into the battery pack, thereby realizing dynamic energy fusion between the external power supply and the lithium battery pack.

[0071] The battery pack condition monitoring module monitors the voltage status of each battery pack section in real time. Based on a comparison with the set reference voltage value, it works in conjunction with the power switching controller to divide the operation of the energy-saving power supply device into two stages: power mixing and energy recovery. In the power mixing stage, the power switching control module connects the combined power supply, consisting of an external power supply and a series-connected lithium-ion battery pack, to the DC power input of the inverter, which then converts it into AC power to supply the load. In the energy recovery stage, the power controller cuts off the power supply from the combined power supply to the inverter and directly connects the external power supply to the external power output to directly supply the load. During the energy recovery period, the series-connected lithium-ion battery pack receives continuous charging from the rechargeable charger. When the voltage of the lithium-ion battery pack rises to the reference voltage for power mixing, the energy-saving power supply device enters a new round of operation under the joint control of the battery pack condition monitoring module and the power switching control module.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A user-side power hybrid high-efficiency storage and discharge energy-saving power supply device, characterized in that, The device disconnects the direct connection between the external power supply and the power consumption side, and is located between the external power supply and the electrical load. The device includes an external power supply, a series-connected lithium-ion battery pack, a segmented rechargeable charger, a unit battery state-of-charge balancing energy source, a nested dual-cycle scanning signal generator, a battery pack operating condition detection module, a power switching controller, and an inverter, wherein: External power supply is used to provide basic electrical energy; A series-connected lithium-ion battery pack is divided into multiple battery segments, each containing multiple cell units for storing and releasing electrical energy. The section-type rechargeable charger has its input end connected to the external power supply and its output end connected to each section of the battery pack. It is used to convert the electrical energy of the external power supply into rechargeable energy and inject it into the corresponding section of the battery pack during the process of the device supplying power to the load. The unit battery state-of-charge equalization energy source has its input end connected to the external power supply and its output end connected to each unit battery. It is used to convert the external power supply into balanced energy and inject it into the corresponding unit batteries during the process of the device supplying power to the load, thereby balancing the state of charge of the unit batteries. The nested dual-cycle scanning signal generator is used to generate the section-based energy-saving cycle scanning control signal and the unit battery state-of-charge equalization cycle scanning control signal, control the working status of the section-based energy-saving charger and the unit battery state-of-charge equalization energy source, and change the mode of the cycle scanning signal according to the changes in electrical parameters of the energy-saving power supply device during operation. The battery pack operating condition detection module is used to detect the voltage status of the series-connected lithium battery pack during operation, and compare and identify the voltage detection value with the two judgment benchmark voltage values ​​of termination charge mixing and recovery charge mixing. Based on the judgment result, it sends the corresponding request and conversion switching command to the power switching controller and the nested dual-cycle scanning signal generator in the energy-saving power supply device. The power switching controller is a key component connecting the external power supply, the series-connected lithium battery pack, the inverter, and the electrical load. It is used to change the connection relationship between the two power supplies and the inverter's electrical load according to different switching request signals issued by the battery pack condition detection module. At the same time, it sends signal mode conversion instructions to the nested dual-cycle scanning signal generator to divide the operation of the energy-saving power supply device into a power mixing stage and an energy recovery stage. An inverter, connected to a power switching controller, is used to convert the DC power of a series-connected lithium-ion battery pack into AC power to supply AC loads on the power consumption side.

2. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, The segmented rechargeable charger includes multiple charger units, each connected to a segment of the battery pack. It converts the voltage of the external power supply to a charging voltage suitable for that segment of the battery pack. Each rechargeable charger has a charging start / stop control terminal. During the power mixing phase, it receives segmented rechargeable cycle scanning signals from a nested dual-cycle scanning signal generator, periodically taking over the power supply function of the corresponding segment of the battery pack to the load, and simultaneously recharges that segment of the battery pack. During the energy recovery phase, it receives static charging signals from the nested dual-cycle scanning signal generator and uses the rechargeable charger to continuously charge each segment of the battery pack for energy recovery.

3. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, The unit cell state-of-charge balancing energy source unit includes multiple balancing control units. Each balancing control energy source is connected to the corresponding unit cell and is used to receive the unit cell state-of-charge balancing scan signal sent from the dual-cycle scan signal generator during the charge mixing period. It converts the external power supply into balancing energy suitable for the unit cell and balances the state of charge of each unit cell under the control of the balancing signal of the nested dual-cycle scan signal generator. Each balancing energy source is equipped with a segment selection signal control terminal to ensure the synchronization of energy injection between each segment of the battery pack and each unit cell in the same segment. During the energy recovery phase, the state scanning balancing of each unit cell will be stopped.

4. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, The nested dual-cycle scanning signal generator generates a segmented energy-supply cycle scanning control signal and a unit battery state-of-charge balancing cycle scanning control signal. The two scanning signals maintain a nested logical relationship in terms of timing, that is, there are several state-of-charge balancing control cycles within a segmented energy-supply control cycle. While each segment of the battery pack is being charged, the state of charge of each unit battery in the same segment is scanned and balanced. During the operation of the device, the signal of the nested dual-cycle scanning signal generator is divided into a dynamic energy-supply control mode in the energy mixing stage or a static charging mode in the energy recovery stage according to the conversion command sent by the power switching controller.

5. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, The voltage of each battery segment is fed into the battery pack condition detection module. The module has two judgment reference voltages: termination of charge mixing and restoration of charge mixing. The battery pack condition detection module compares the terminal voltage of each battery segment in the series-connected lithium battery pack with the two set judgment reference voltages in real time. When the measured voltage matches one of the set judgment reference voltages, it sends a corresponding switching request signal to the charge switching controller.

6. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, The power switching controller is equipped with an input terminal for the external power supply and the series-connected lithium battery pack, a DC power supply terminal for the inverter, an output terminal for the external power supply, and a cyclic scanning signal mode conversion command sending terminal. When the power switching controller receives the termination power mixing request signal sent by the battery pack operating condition detection module, the power switching controller will cut off the power supply from the series-connected lithium battery pack to the inverter, and connect the input terminal and the output terminal of the external power supply, so that the external power supply directly supplies power to the load.

7. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, Upon receiving the termination of charge mixing request signal from the battery pack condition detection module, the power switching controller sends a signal mode conversion command to the nested dual-cycle scanning signal generator. The nested dual-cycle scanning signal generator stops sending the cell battery state of charge equalization control cycle scanning control signal and changes the segment power supply control signal from dynamic cycle scanning to a non-scanning full-charge state. Each segment of the battery pack stops supplying power to the load and enters the steady-state charging stage of the power supply charger. When the voltage of each segment of the battery pack rises back to the set recovery charge mixing judgment reference voltage value, the battery pack condition detection module sends a power mixing recovery switching request signal to the power switching controller. The power switching controller restores the output relationship of the two types of power to the connection state of the charge mixing stage. At the same time, the nested dual-cycle scanning signal generator returns to the nested dynamic scanning mode and begins a new round of charge mixing cycle operation.

8. The user-side power hybrid high-efficiency storage and discharge energy-saving power supply device according to claim 1, characterized in that, The device also includes a communication module for data communication with external devices to enable remote monitoring and control functions.

9. A user-side power hybrid high-efficiency storage and discharge energy-saving power supply method, applied in the device described in any one of claims 1-8, wherein the device disconnects the direct connection between the external power supply and the electrical load, characterized in that, The method includes: converting an external power supply to indirectly provide electrical energy to the load on the power consumption side; Under the signal control of a nested dual-cycle scanning signal generator, the conventional external power supply and the chemical power of a series-connected ion battery pack are integrated into a novel synthetic power source. The series-connected lithium battery pack is divided into multiple battery segments, each containing multiple cell units. The voltage of the external power supply is converted into a voltage suitable for charging each battery segment by the segment power supply charger. Under the control of the segment power supply cycle scanning signal, each battery segment is charged sequentially. During the power supply charging period, each power supply charger periodically takes over the power supply to the load from the corresponding battery segment. The unit cell state of charge balancing energy source converts the electrical energy from the external power supply into energy suitable for balancing each unit cell, and performs state of charge balancing on each unit cell under the control of the unit cell state of charge balancing cyclic scanning signal. By using the segmented energy-supplying cyclic scanning control signal and the unit battery state-of-charge balancing cyclic scanning control signal generated by the nested dual cyclic scanning signal generator, the energy-supplying chargers of each segment and the state-of-charge balancing energy source of each unit battery inject and balance energy into each segment battery pack and unit battery, thereby realizing the dynamic energy fusion between the external power supply and the lithium battery pack. The battery pack condition monitoring module monitors the voltage status of each battery pack section in real time. Based on a comparison with the set judgment reference voltage value, it works in conjunction with the power switching controller to divide the operation of the energy-saving power supply device into two stages: power mixing and energy recovery. In the power mixing stage, the power switching control module connects the combined power supply consisting of the external power supply and the series-connected lithium-ion battery pack to the DC power input terminal of the inverter, which converts it into AC power to supply the load. In the energy recovery stage, the power controller cuts off the power supply from the combined power supply to the inverter and supplies the external power supply to the load directly. During the energy recovery period, the series-connected lithium-ion battery pack receives continuous charging from the rechargeable charger. When the voltage of the lithium-ion battery pack rises to the power mixing judgment reference voltage, the energy-saving power supply device enters a new round of operation under the joint control of the battery pack condition monitoring module and the power switching controller.

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