CN219287208U - Energy storage device and household energy storage system - Google Patents
Energy storage device and household energy storage system Download PDFInfo
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- CN219287208U CN219287208U CN202223111376.9U CN202223111376U CN219287208U CN 219287208 U CN219287208 U CN 219287208U CN 202223111376 U CN202223111376 U CN 202223111376U CN 219287208 U CN219287208 U CN 219287208U
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Abstract
The utility model discloses an energy storage device and a household energy storage system. The energy storage device includes: a fixed energy storage portion and at least one removable energy storage portion. The stationary energy storing part includes: the device comprises a fixed energy storage module and a main control module connected with the fixed energy storage module; the detachable energy storage portion includes: the system comprises a detachable energy storage module and a slave control module connected with the detachable energy storage module; each detachable energy storage module is detachably connected with the fixed energy storage module, and each slave control module is detachably connected with the master control module; the energy storage capacity of the fixed energy storage module is larger than that of the detachable energy storage module. The embodiment of the utility model can meet the use requirements of high capacity and portability of the energy storage device.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to an energy storage device and a household energy storage system.
Background
The household energy storage system is similar to a miniature energy storage power station, and the operation of the household energy storage system is not affected by urban power supply pressure. The electric energy stored by the energy storage device in the household energy storage system can be used for household appliances when the power consumption peak or the mains supply is cut off.
From the viewpoint of portability, existing energy storage devices can be classified into fixed energy storage and mobile energy storage. The fixed energy storage device has large energy storage capacity, can be used as a household emergency power supply to supply power to household loads, can also play a role in balancing power loads, and cannot be portable and carried as a mobile power supply. The movable energy storage device is a portable energy storage device, has smaller capacity, can only meet the short-time power consumption requirement of a small-sized electric appliance, cannot transmit power to a household power grid when the mains supply fails, and is insufficient to meet the power consumption requirement of the household electric appliance. Therefore, it is difficult to satisfy both high capacity and portability requirements of the existing energy storage devices.
Disclosure of Invention
The utility model provides an energy storage device and a household energy storage system, which are used for meeting the use requirements of high capacity and portability of the energy storage device.
In a first aspect, an embodiment of the present utility model provides an energy storage device, including: a fixed energy storage portion and at least one removable energy storage portion;
the stationary energy storing part includes: the device comprises a fixed energy storage module and a main control module connected with the fixed energy storage module;
the detachable energy storage portion includes: the system comprises a detachable energy storage module and a slave control module connected with the detachable energy storage module;
each detachable energy storage module is detachably connected with the fixed energy storage module, and each slave control module is detachably connected with the master control module;
the energy storage capacity of the fixed energy storage module is larger than that of the detachable energy storage module.
Optionally, in any of the detachable energy storage parts, the detachable energy storage module includes n-stage battery cells, n being an integer greater than 1; the slave control module comprises n-1 level control units which are connected with the previous n-1 level battery units in a one-to-one correspondence manner; the adjacent two-stage battery units are detachably connected, and the adjacent two-stage control units are detachably connected; the 1 st-stage battery unit is detachably connected with the fixed energy storage module, and the 1 st-stage control unit is detachably connected with the main control module.
Optionally, the slave control module further comprises an nth-stage control unit correspondingly connected with the nth-stage battery unit; the nth stage control unit is detachably connected with the n-1 th stage control unit.
Optionally, the level 1 battery unit includes: and the inversion subunit is electrically connected with the 1 st-stage control unit.
Alternatively, the energy storage capacities of the 1 st to nth battery cells are reduced stepwise.
Optionally, the energy storage capacity of the fixed energy storage module is greater than the sum of the energy storage capacities of the detachable energy storage modules.
In a second aspect, embodiments of the present utility model further provide a household energy storage system, including an energy storage device as provided in any embodiment of the present utility model.
Optionally, the household energy storage system further comprises: the system comprises an inversion module, a first switch module, a second switch module and a third switch module;
the inversion module is respectively and electrically connected with the fixed energy storage module, the main control module and the first end of the first switch module; the first end of the second switch module is connected with the mains supply; the first end of the third switch module is electrically connected with a household load; the second end of the first switch module, the second end of the second switch module and the second end of the third switch module are connected through a bus.
Optionally, the household energy storage system further comprises: the current detection device is connected between the second end of the second switch module and the bus; the current detection device is also respectively and electrically connected with the control ends of the main control module and the second switch module.
Optionally, the household energy storage system further comprises: a photovoltaic charge controller and a DC-DC converter;
the photovoltaic charging controller is electrically connected with the photovoltaic module and the DC-DC converter respectively;
the DC-DC converter is respectively and electrically connected with the main control module and the fixed energy storage module.
The energy storage device provided by the embodiment of the utility model is provided with a fixed energy storage part and at least one detachable energy storage part, and each energy storage part comprises an energy storage module and a control module. When the detachable energy storage part is connected with the fixed energy storage part, each energy storage part is used as household energy adjusting equipment together, and can be uniformly controlled by the main control module. The detachable energy storage part can be separated from the fixed energy storage part, and when the detachable energy storage part is used as an off-grid mobile power supply, the slave control module can independently and flexibly control the discharging process of the detachable energy storage module so as to ensure the portability of the energy storage device; at this time, the fixed energy storage part is still used as household energy adjusting equipment, and the power consumption requirement of household load can be still met due to the large energy storage capacity of the fixed energy storage part. Therefore, compared with the prior art, the energy storage device provided by the embodiment of the utility model can meet the use requirements of high capacity and portability of the energy storage device.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an energy storage device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another energy storage device according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a household energy storage system according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of another household energy storage system according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The embodiment of the utility model provides an energy storage device. Fig. 1 is a schematic structural diagram of an energy storage device according to an embodiment of the present utility model. Referring to fig. 1, the energy storage device includes: a fixed energy storage portion 10 and at least one removable energy storage portion 20, one removable energy storage portion 20 being shown by way of example in fig. 1.
Wherein the stationary energy storing part 10 includes: the device comprises a fixed energy storage module 11 and a main control module 12 connected with the fixed energy storage module 11. The detachable energy storage portion 20 includes: a detachable energy storage module 21 and a slave module 22 connected to the detachable energy storage module 21. Each detachable energy storage module 21 is detachably connected with the fixed energy storage module 11, and each slave control module 22 is detachably connected with the master control module 12. Wherein the energy storage capacity of the fixed energy storage module 11 is larger than the energy storage capacity of the detachable energy storage module 21.
For example, the fixed energy storage module 11 and each detachable energy storage module 21 may be formed by at least one energy storage element 101, and the energy storage element 101 may be any type and any capacity of energy storage device such as a battery module, a battery pack or a battery cell, and the specific type, number, serial-parallel structure and stacking manner of the energy storage elements 101 are not limited herein. The energy storage capacity of the fixed energy storage module 11 is larger than the energy storage capacity of the detachable energy storage module 21, and may be achieved by providing that the fixed energy storage module 11 comprises more energy storage elements 101 and/or by providing that the energy storage capacity of the energy storage elements 101 in the fixed energy storage module 11 is larger.
Illustratively, the removable connection of the removable energy storage module 21 with the fixed energy storage module 11 may be: a slot is formed on the packaging box body of the fixed energy storage module 11 and is used for placing the detachable energy storage module 21; wherein, draw forth electric connection contact in the fixed energy storage module 11 to the slot, draw forth electric connection contact to its encapsulated layer outer wall in the detachable energy storage module 21 to when making detachable energy storage module 21 insert in the slot, the detachable energy storage module 21 contacts with the electric connection contact of fixed energy storage module 11, realizes the electric connection.
An energy management system (Energy Management System, EMS) may be included in both the master control module 12 and the slave control module 22 to enable charge and discharge control of the respective connected energy storage modules. Illustratively, the main control module 12 may be packaged together with the stationary energy storage module 11, or separately packaged; the slave module 22 may be packaged together with the detachable energy storage module 21 or separately. For example, the master control module 12 and/or the slave control module 22 may further include a battery management system (Battery Management System, BMS) in which state monitoring devices corresponding to the energy storage elements 101 in the energy storage module one by one may be disposed to monitor parameters such as temperature, voltage, and current of the energy storage elements 101. Each condition monitoring device may be collectively connected to a master device in the battery management system, which may be connected to the energy management system to perform real-time analysis of the parameter data of each energy storage element 101 and dynamically formulate a battery management policy in conjunction with control of the energy management system.
When the detachable energy storage part 20 is connected with the fixed energy storage part 10, the detachable energy storage module 21 and the fixed energy storage module 11 form a whole, the master control module 12 is connected with each slave control module 22, each slave control module 22 is uniformly controlled by the master control module 12, a control strategy is generated by the master control module 12, the master control module 12 directly controls the charging and discharging process of the fixed energy storage module 11 based on the control strategy, and each slave control module 22 controls the charging and discharging process of each detachable energy storage module 21 according to the control strategy.
When the detachable energy storage part 20 is separated from the fixed energy storage part 10 and used as an independent off-grid mobile power supply, the detachable energy storage module 21 and the slave control module 22 are detached simultaneously, the slave control module 22 independently controls the discharging process of the detachable energy storage module 21, and the discharging mode and the discharging state of the detachable energy storage module 21 can be flexibly controlled according to the power consumption requirements of different electric appliances. For example, a functional unit with an inversion function may be configured in the detachable energy storage module 21, so that the off-grid mobile power supply has an ac and dc output function, and the application scenario thereof is enriched. In this case, the fixed energy storage portion 10 (including the detachable energy storage portion 20 that is not detached if there is a detachable energy storage portion 20 that is not detached) is used as an energy storage device in the household energy storage system, and is controlled by the main control module 12, and the energy state in the household microgrid is adjusted in cooperation with the mains supply, the photovoltaic and the like.
Wherein, the energy storage capacity of the detachable energy storage module 21 may be set smaller based on portability consideration of the mobile power source, and the energy storage capacity of the fixed energy storage module 11 may be set larger based on electricity demand consideration of the household load. For example, the energy storage capacity of the fixed energy storage module 11 may be set to be larger than the sum of the energy storage capacities of the detachable energy storage modules 21, and the specific capacity value may be set according to actual demands.
The energy storage device provided by the embodiment of the utility model is provided with a fixed energy storage part 10 and at least one detachable energy storage part 20, and each energy storage part comprises an energy storage module and a control module. When the detachable energy storage part 20 is connected with the fixed energy storage part 10, the energy storage parts are used as household energy adjusting equipment together and can be uniformly controlled by the main control module 12. The detachable energy storage part 20 can be separated from the fixed energy storage part 10, and when the detachable energy storage part is used as an off-grid mobile power supply, the slave control module 22 can independently and flexibly control the discharging process of the detachable energy storage module 21 so as to ensure the portability of the energy storage device; at this time, the fixed energy storage portion 10 is still used as a household energy storage device, and the energy storage capacity of the fixed energy storage module 11 is large, so that the power consumption requirement of the household load can be still met. Therefore, compared with the prior art, the energy storage device provided by the embodiment of the utility model can meet the use requirements of high capacity and portability of the energy storage device.
The above embodiments provide a core idea of the present disclosure, and in general, the fixed energy storage portion 10 cannot be conveniently detached and moved, occupies most of the capacity, and is used for solving the requirement of the energy storage device for large capacity; the detachable energy storage portion 20 is freely detachable and occupies a small portion of the capacity, and is mainly used for solving the need for portability of the energy storage device. The specific structure of the detachable energy storage portion 20 will be described below.
In one embodiment, the detachable energy storage part may be designed as a multi-stage detachable structure, so that the user can select the detached level and the detached capacity according to different electricity requirements. The following is a detailed description with reference to fig. 1.
With continued reference to fig. 1, in one embodiment, optionally, for any of the removable energy storage sections 20, the removable energy storage module 21 may include n-stage battery cells 210, where n is an integer greater than 1, with removable connections between adjacent two-stage battery cells 210. The slave control module 22 includes n-stage control units 220 connected to each stage of battery units 210 in a one-to-one correspondence, and adjacent two-stage control units 220 are detachably connected. The 1 st stage battery unit 210 is detachably connected with the fixed energy storage module 11, and the 1 st stage control unit 220 is detachably connected with the main control module 12. Two-stage battery unit 210 and two-stage control unit 220 are exemplarily shown in fig. 1, and a 1 st-stage battery unit 211 is connected to a 1 st-stage control unit 221, a 2 nd-stage battery unit 212 is connected to a 2 nd-stage control unit 222, and the 1 st-stage control unit 221 is detachably connected to the 2 nd-stage control unit 222.
The embodiment is configured such that each stage of battery unit 210 is provided with a corresponding control unit 220, so as to realize off-grid control on any stage of battery unit 210.
Illustratively, upon disassembly, the control unit 220 is commonly disassembled following the battery cells 210 to which it is connected. And, when it is necessary to disassemble the i-th stage battery cell 210, the i-th to n-th stage battery cells 220 may be commonly disassembled as a whole. When the rear-stage battery cell 210 is connected with the front-stage battery cell 210, the rear-stage control unit 220 may be controlled by the front-stage control unit 220. When the detachable energy storage part 20 is connected with the fixed energy storage part 10, the control part of the energy storage device forms a cascade structure of the main control module 12 and each level of control unit 220, so that the step-by-step control of the charge and discharge processes of the fixed energy storage module 21 and each level of battery unit 210 can be realized.
The above embodiments exemplarily show that each of the battery cells 210 is connected with a corresponding control unit 220, but are not limiting of the present utility model. In other embodiments, the nth stage battery cells 210 may optionally be provided without a corresponding control unit to simplify the energy storage structure and control logic. Whether the front n-1 battery unit 210 is detached or not, the control requirement of the charging and discharging sequence is met, and a corresponding control unit 220 is needed to be provided for charging and discharging control; the last-stage cell 210, i.e., the nth-stage cell 210, may be directly passively charged when connected to the (n-1) -th-stage cell 210 and provide a single discharging function when disassembled, so that the nth-stage control unit may not be provided. Referring specifically to fig. 2, an exemplary connection structure of the three-stage battery cell and the two-stage control unit is shown in fig. 2, and the 3 rd-stage battery cell 213 may not be connected to the control unit. It should be noted that, in the same detachable energy storage module 21, the number of battery units in the same stage is not limited to 1, and the number of battery units in each stage may be set according to actual requirements, so long as it is ensured that each battery unit is equipped with a corresponding control unit in at least the first n-1 stages.
With continued reference to fig. 2, in addition to the energy storage element, optionally, the stage 1 battery unit 211 further includes: the inverter subunit 23, the inverter subunit 23 is electrically connected to the 1 st stage control unit 221. The inverter subunit 23 is arranged, so that the 1 st-stage battery unit 211 has a direct current output function and an alternating current output function, and the application scenes when the detachable energy storage part is used independently are enriched. For example, the inverter subunit 23 may be constituted by an inverter.
Illustratively, the energy storage capacities of the 1 st to nth battery cells 210 decrease stepwise, and the last battery cell 210 is a miniature battery with the smallest energy storage capacity. When the detachable energy storage module 21 is packaged, the battery cells 210 of each stage may be divided into several stages according to the energy storage capacity. In this way, the battery system of the entire energy storage device includes a fixed portion (fixed energy storage module 11) and a movable portion (removable energy storage module 21) including a multi-stage detachable structure therein, and the final battery cell 210 can be used as a micro battery. The user can select the number of the disassembly stages of the battery unit 210 in the detachable energy storage part according to the power consumption requirement. When the mobile power supply is required to have an alternating current output function, the whole detachable energy storage part can be detached for use.
In summary, this embodiment provides a multistage separation and can dismantle energy storage structure, can compromise large capacity and portability, can send power to domestic appliance in the family, conveniently carries in the open air. The detachable energy storage module 21 can realize multi-stage separation according to the needs, can realize multi-stage independent power supply and integration functions of the energy storage device based on the control of the control unit 220 and the main control module 12 at each stage, and can flexibly adjust the energy storage charging and discharging strategies according to the use situations.
For practical use of the energy storage device, for example, when no mobile power supply is required, each stage of battery unit 210 and the fixed energy storage module 11 can be integrated into a whole, and based on unified control of the main control module 12, peak clipping, valley filling and other treatments are performed on new energy power generation through charge and discharge of the energy storage device, so that impact of the new energy power generation on commercial power is reduced. In the control process, each level of control unit 220 communicates with the upper level of control unit 220, and is finally controlled by the main control module 12. When the energy storage device is charged, a charging strategy can be set as follows: preferably charging the removable energy storage module 21; for removable energy storage module 21, the final battery cell 210 may be charged in order of the nth stage to the 1 st stage with priority. This arrangement is due to: the capacity of the fixed energy storage module 11 is large, the charging time is long, and in order to avoid that the detachable energy storage module 21 is not charged yet when a user has a mobile power supply requirement, the detachable energy storage module 21 can be charged preferentially, so that the mobile power consumption requirement of the user is met as much as possible. Meanwhile, since the detachable energy storage module 21 has a smaller energy storage capacity, the charging process takes a shorter time, and the charging process of the fixed energy storage module 11 is not substantially affected.
When the family member goes out and has a mobile power supply requirement, any one or more stages of battery units 210 and a control unit 220 connected with the battery units can be detached at will. When there is an ac power demand, the level 1 battery unit 211 and the level 1 control unit 221 can be detached, for example, the portable computer, the sound equipment, the barbecue oven and other electric equipment can be used when going out. After going out, the battery unit 210 after power consumption is inserted into the corresponding previous slot, and the control units 220 at each stage can charge the battery unit 210 after power consumption according to a preset charging rule. For example, the preset charging rule may be to charge the currently plugged-back battery cell preferentially.
The embodiment of the utility model also provides a household energy storage system which comprises the energy storage device provided by any embodiment of the utility model, and has corresponding beneficial effects. The structure of the consumer energy storage system is described below.
Fig. 3 is a schematic structural diagram of a household energy storage system according to an embodiment of the present utility model. Referring to fig. 3, the household energy storage system illustratively comprises: the energy storage device 100, the inverter module 30, the first switching module 40, the second switching module 50, and the third switching module 60.
The inverter module 30 is electrically connected with the first ends of the fixed energy storage module 11, the main control module 12 and the first switch module 40 respectively; the first end of the second switch module 50 is connected with the mains supply; the first end of the third switch module 60 is electrically connected to the home load; the second end of the first switch module 40, the second end of the second switch module 50 and the second end of the third switch module 60 are connected by a bus bar L.
The energy flow direction in the energy storage system can be controlled by switching on and off of each switch module and adjusting the charging and discharging process of the energy storage device 100 through the main control module 12, so that the supply and adjustment of the mains supply are realized. Illustratively, during daytime electricity charge peaks, the second switch module 50 is controlled to be turned on with the third switch module 60, and the first switch module 40 is controlled to be turned off; at this time, the utility power only supplies power to the household load normally, and does not charge the energy storage device 100. When the energy storage device 100 stores a certain amount of electric energy, the first switch module 40 may be controlled to be turned on during the peak of the daytime electric charge, and the energy storage device 100 may be controlled to discharge to supply power to the household load together with the mains supply. At night electricity charge low, three switch modules may be controlled to be all turned on and charge the energy storage device 100 during the low electricity charge period.
Fig. 4 is a schematic structural diagram of another household energy storage system according to an embodiment of the present utility model. Referring to fig. 4, the first switch module 40 may include a circuit breaker S1 and a leakage protection switch S2 to implement on-off control and leakage protection between the energy storage device 100 and the bus bar L, for example. The second switch module 50 may include a circuit breaker S4 and an intelligent switch S3 to achieve on-off control between the utility power and the bus L. The third switching module 60 may include a western circuit breaker S5 to implement on-off control between the home load and the bus bar L.
With continued reference to fig. 4, in addition to the foregoing embodiments, optionally, the household energy storage system further includes: the current detection device 70 is connected between the second end of the second switch module 50 and the bus L, specifically between the intelligent switch S3 and the bus L; the current detecting device 70 is also electrically connected to the control terminals of the main control module 12 and the second switch module 50 (specifically, the control terminal of the intelligent switch S3), respectively.
In this embodiment, the current detecting device 70 is used for detecting a current direction, or a power transmission direction, and controlling the on-off state of the intelligent switch S3 according to the current direction or the power transmission direction.
Specifically, when the household-in electrical energy flows in the forward direction, i.e. the current flows from the mains current to the busbar L, it is indicated that the mains supply supplies the household load. At this time, the main control module 12 can detect the electric quantity of the energy storage device 100, and if the electric quantity of the energy storage device 100 is insufficient, a charging rule can be established to control the mains supply to charge the energy storage device 100, so that the energy storage device 100 stores energy in the grid-connected mode. If the energy storage device 100 is sufficient, the energy storage device 100 is not charged, and the utility power is only used by the household load normally.
When the household electric energy is zero, namely the current is 0, two states exist at the moment: the utility power is cut off or no electric equipment is arranged in the household load, and the specific condition can be confirmed by detecting the electric power through the main control module 12. The protection measures in each case are as follows:
1) In order to prevent the power line of the energy storage device 100 from transmitting power outwards (in the direction of the mains supply) when there is no electric consumer in the household load, the current detection device 70 detects the reverse flow of power and communicates with the intelligent switch S3. When the current flows from the bus L to the mains, the current detection device 70 controls the intelligent switch S3 to be turned off, preventing reverse current, so as to avoid island effect.
2) When the mains supply fails, the energy storage device 100 can supply power to the household load for the household appliance to consume the electric energy normally, and at this time, the main control module 12 detects the power consumption and controls the output state of the energy storage device 100 to provide stable voltage and frequency support for the micro-grid. To prevent the power from being fed along the line to the mains, the current detection device 70 detects the reverse flow of the power, communicates with the intelligent switch S3, and if necessary, turns off the intelligent switch S3 to prevent the reverse flow and the island effect.
In summary, in the household energy storage system, a control system is composed of a main control module 12, a current detection device 70 and an intelligent switch S3; the energy system is composed of mains, household loads and energy storage device 100. The current detection device 70 is used for detecting the electric energy direction of the home entrance side of the household.
With continued reference to fig. 4, in addition to the foregoing embodiments, optionally, the household energy storage system further includes: the photovoltaic charge controller 80 and the DC-DC converter 90 to form a photovoltaic consumer energy storage system.
Wherein the photovoltaic charge controller 80 is electrically connected to the photovoltaic module 70 and the DC-DC converter 90, respectively; the DC-DC converter 90 is electrically connected to the main control module 12 and the fixed energy storage module 11, respectively. Illustratively, the photovoltaic charge controller 80 may employ a maximum power point tracking solar controller (Maximum Power Point Tracking, MPPT).
The photovoltaic energy storage system can be charged and discharged under the grid-connected condition, and can be particularly divided into a complete alternating current scene and an alternating current-direct current scene. The complete communication scenario can be seen from the explanation in the above embodiments, and will not be repeated. The energy storage device 100 can be charged by using the photovoltaic module 70 and the mains supply when the mains supply and the photovoltaic are jointly involved in the ac/dc scene. The energy storage device 100 is in a charged, power-delivering or mobile off-grid power-using state to a household load according to environmental requirements. For example, the main control module 12 may be configured to detect photovoltaic power, load power, energy storage device output power, and remaining power, and control the energy transfer process accordingly. For example, controlling the household load to preferentially use the electrical energy generated by the photovoltaic module 70, when the photovoltaic power generation is greater than the electrical demand, the electrical energy may be stored within the energy storage device 100; after the energy storage device 100 is full, excess energy may be returned to the power grid.
In summary, the household energy storage system provided in this embodiment adopts the photovoltaic dc power supply and the commercial ac power supply, and cooperates with the charge and discharge of the energy storage device 100 to realize the power supply to the household load. The main control module 12 can collect relevant information in the power grid to perform charge-discharge logic selection, so that the energy storage device 100 can realize peak clipping, valley filling and other functions. The current detection device 70 is used for realizing the backflow prevention function. When a user needs a mobile power supply, the detachable energy storage part of the energy storage device 100 can be taken to be used as the mobile power supply.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. An energy storage device, comprising: a fixed energy storage portion and at least one removable energy storage portion;
the stationary energy storing part includes: the device comprises a fixed energy storage module and a main control module connected with the fixed energy storage module;
the detachable energy storage portion includes: the system comprises a detachable energy storage module and a slave control module connected with the detachable energy storage module;
each detachable energy storage module is detachably connected with the fixed energy storage module, and each slave control module is detachably connected with the master control module;
the energy storage capacity of the fixed energy storage module is larger than that of the detachable energy storage module.
2. The energy storage device of claim 1, wherein in any of the removable energy storage sections, the removable energy storage module comprises n-stage battery cells, n being an integer greater than 1; the slave control module comprises n-1 level control units which are connected with the previous n-1 level battery units in a one-to-one correspondence manner; the adjacent two-stage battery units are detachably connected, and the adjacent two-stage control units are detachably connected; the 1 st-stage battery unit is detachably connected with the fixed energy storage module, and the 1 st-stage control unit is detachably connected with the main control module.
3. The energy storage device of claim 2, wherein the slave control module further comprises an nth stage control unit correspondingly connected to the nth stage battery cell; the nth stage control unit is detachably connected with the n-1 th stage control unit.
4. The energy storage device of claim 2, wherein the level 1 cell comprises: and the inversion subunit is electrically connected with the 1 st-stage control unit.
5. The energy storage device of claim 2, wherein the energy storage capacities of the 1 st to n th battery cells decrease stepwise.
6. The energy storage device of claim 1, wherein the fixed energy storage module has an energy storage capacity greater than a sum of the energy storage capacities of the removable energy storage modules.
7. A household energy storage system comprising an energy storage device as claimed in any one of claims 1 to 6.
8. A household energy storage system as in claim 7, further comprising: the system comprises an inversion module, a first switch module, a second switch module and a third switch module;
the inversion module is respectively and electrically connected with the fixed energy storage module, the main control module and the first end of the first switch module; the first end of the second switch module is connected with the mains supply; the first end of the third switch module is electrically connected with a household load; the second end of the first switch module, the second end of the second switch module and the second end of the third switch module are connected through a bus.
9. A household energy storage system as in claim 8, further comprising: the current detection device is connected between the second end of the second switch module and the bus; the current detection device is also respectively and electrically connected with the control ends of the main control module and the second switch module.
10. A household energy storage system as in claim 7, further comprising: a photovoltaic charge controller and a DC-DC converter;
the photovoltaic charging controller is electrically connected with the photovoltaic module and the DC-DC converter respectively;
the DC-DC converter is respectively and electrically connected with the main control module and the fixed energy storage module.
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| CN202223111376.9U CN219287208U (en) | 2022-11-22 | 2022-11-22 | Energy storage device and household energy storage system |
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