Multifunctional low-voltage energy storage device and low-voltage energy storage system

Abstract

The utility model discloses a multifunctional low-voltage energy storage device and a low-voltage energy storage system, and the device comprises a housing, a current transmission conversion unit, an energy storage control unit, an output switch unit, and an output selection switch. Wherein an alternating current inlet wire interface is embedded in the shell and used for being connected with external alternating current, outputting the alternating current to the output switch unit after the alternating current passes through the current transmission unit and / or converting the alternating current into direct current through the current transmission unit to charge the energy storage control unit, and the energy storage control unit is further connected with the output switch unit. The output selection switch is used for outputting direct current to the output switch unit, the output selection switch is used for receiving control of the energy storage control unit and controlling a working output interface in the output switch unit to be an alternating current power supply interface or a direct current power supply interface, and then direct current or alternating current is selected to be output according to the power utilization type of a load. An energy storage device is single in power supply mode, high in cost and poor in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage device technical field especially is related to a kind of multifunctional low voltage energy storage device and low voltage energy storage system. BACKGROUND

[0002] In the current work, life scene, the diversification of electric equipment further leads to single direct current power supply device or single alternating current power supply device cannot simultaneously provide two power supply modes, which leads to the user needs to have two different power supply mode energy storage device simultaneously, which causes the use cost of user to increase, and installation needs to occupy larger space.

[0003] Therefore, how to solve the technical problems of the related art, such as the single power supply mode of the energy storage device, the high cost of the equipment when the user needs to equip two power supply modes, and the poor applicability, become the technical problems that the technical personnel in the field need to overcome. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of multifunctional low voltage energy storage device and low voltage energy storage system, to solve the technical problems such as the single power supply mode of energy storage device in the related art, high cost and poor applicability.

[0005] A kind of multifunctional low voltage energy storage device in the utility model, it includes:

[0006] Shell, the shell is provided with cavity, the shell is embedded with alternating current incoming line interface, the alternating current incoming line interface is used to connect external alternating current;

[0007] Current transmission conversion unit, fixedly set in the cavity, connected with the alternating current incoming line interface, for receiving the external alternating current;

[0008] Energy storage control unit, fixedly set in the cavity, connected with the current transmission conversion unit, for receiving and storing electric energy, or outputting direct current to the current transmission conversion unit;

[0009] Output switch unit, fixedly set in the cavity, the input end of the output switch unit is connected with the output end of the current transmission conversion unit, the charge-discharge interface of the energy storage control unit respectively, the output end of the output switch unit is connected with alternating current power supply interface, direct current power supply interface respectively;

[0010] Output selection switch, fixedly set on the surface of the shell, one end of the output selection switch is connected with the control end of the energy storage control unit, the other end of the output selection switch is connected with the control end of the output switch unit.

[0011] The utility model discloses a kind of multifunctional low-voltage energy storage devices at least have following beneficial effects:

[0012] The utility model discloses a kind of multifunctional low-voltage energy storage devices, is provided with shell, current transmission conversion unit, energy storage control unit, output switch unit and output selection switch;Wherein, shell is embedded with alternating current incoming line interface, it is used to connect external alternating current, after current transmission unit, output alternating current to output switch unit and / or alternating current is converted into direct current by current transmission unit to energy storage control unit and charges, energy storage control unit is also connected with output switch unit, for output direct current to output switch unit, output selection switch is used to receive the control of energy storage control unit, for controlling the working output interface in output switch unit is alternating current power supply interface or direct current power supply interface, to realize according to the power type selection output direct current or alternating current of load, solve the related art, energy storage device can only exist with single alternating current power supply mode or single direct current power supply mode Power supply mode single, user needs to equip two power supply modes when equipment cost is high and the technical problem of poor applicability, provide a kind of direct current power supply and alternating current power supply in one, low-cost, strong applicability multifunctional low-voltage energy storage device.

[0013] According to some other embodiments of the utility model's multifunctional low-voltage energy storage device, the energy storage control unit includes energy storage battery pack and BMS controller;

[0014] The BMS controller is connected with the energy storage battery pack, for controlling the charge-discharge state of the energy storage battery pack;

[0015] The BMS controller is also connected with the output selection switch, for controlling the working state of the output selection switch, and then the working state of the output switch unit can be controlled to realize alternating current output or direct current output.

[0016] According to some other embodiments of the utility model's multifunctional low-voltage energy storage device, the output switch unit includes first relay switch and second relay switch;

[0017] The input end of the first relay is connected with the output end of the current transmission conversion unit, the output end of the first relay is connected with the alternating current power supply interface, and the control end of the first relay switch is connected with the output selection switch;

[0018] The input end of the second relay switch is connected with the charge-discharge interface of the energy storage control unit, the output end of the second relay switch is connected with the direct current power supply interface, and the work end of the second relay switch is connected with the output selection switch.

[0019] According to the multi-functional low-voltage energy storage device of some other embodiments of the present utility model, the current transmission conversion unit includes an inverter;

[0020] The AC input interface of the inverter is connected with the AC incoming line interface, the AC output interface of the inverter is connected with the input end of the output switch unit, and the DC input and output interface of the inverter is connected with the charge and discharge interface of the energy storage control unit.

[0021] According to the multi-functional low-voltage energy storage device of some other embodiments of the present utility model, the multi-functional low-voltage energy storage device further includes a DC fast charging interface.

[0022] The DC fast charging interface is embedded in the shell, the DC fast charging interface is connected with the charge and discharge interface of the energy storage control unit, and is used for connecting an external DC voltage source to charge the energy storage control unit.

[0023] According to the multi-functional low-voltage energy storage device of some other embodiments of the present utility model, the multi-functional low-voltage energy storage device further includes a parallel operation interface.

[0024] The parallel operation interface is embedded in the shell, the parallel operation interface is connected in parallel with the AC incoming line interface, and the parallel operation interface is used for being connected to the AC incoming line interface of another multi-functional low-voltage energy storage device.

[0025] In the second aspect, the utility model embodiment further provides a low-voltage energy storage system, including first multi-functional low-voltage energy storage device, second multi-functional low-voltage energy storage device, first multi-functional low-voltage energy storage device, second multi-functional low-voltage energy storage device are all as above described multi-functional low-voltage energy storage device, the connection relation of first multi-functional low-voltage energy storage device, second multi-functional low-voltage energy storage device includes one or more of the following:

[0026] First multi-functional low-voltage energy storage device and second multi-functional low-voltage energy storage device are connected through first connecting line to increase the AC power supply storage capacity or DC power supply storage capacity of low-voltage energy storage system;

[0027] And, first multi-functional low-voltage energy storage device and second multi-functional low-voltage energy storage device are connected through second connecting line to increase the DC power supply power of low-voltage energy storage system.

[0028] According to the low-voltage energy storage system of some other embodiments of the present utility model, the first connecting line is used for connecting the AC power supply interface of the first multi-functional low-voltage energy storage device with the AC incoming line interface of the second multi-functional low-voltage energy storage device.

[0029] According to the low-voltage energy storage system of some other embodiments of the utility model, the second connecting line is used for connecting the direct current power supply interface of the first multifunctional low-voltage energy storage device and the direct current fast charging interface of the second multifunctional low-voltage energy storage device.

[0030] According to the low-voltage energy storage system of some other embodiments of the utility model, the third connecting line is used for connecting the parallel operation interface of the first multifunctional low-voltage energy storage device and the alternating current incoming line interface of the second multifunctional low-voltage energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the first embodiment module composition intention of the utility model multifunctional low-voltage energy storage device;

[0032] Figure 2 It is the concrete embodiment module composition intention of the utility model low-voltage energy storage control unit in multifunctional low-voltage energy storage device;

[0033] Figure 3 It is the second embodiment module composition intention of the utility model multifunctional low-voltage energy storage device;

[0034] Figure 4 It is the third embodiment module composition intention of the utility model multifunctional low-voltage energy storage device;

[0035] Figure 5 It is the fourth embodiment module composition intention of the utility model multifunctional low-voltage energy storage device;

[0036] Figure 6 It is the circuit frame composition structure schematic diagram of the utility model multifunctional low-voltage energy storage device;

[0037] Figure 7 It is the concrete embodiment module composition schematic diagram of the utility model low-voltage energy storage system;

[0038] Figure 8 It is the concrete embodiment circuit frame composition structure schematic diagram of the utility model low-voltage energy storage system in increasing alternating current power supply storage or increasing direct current power supply storage;

[0039] Figure 9 It is the concrete embodiment circuit frame composition structure schematic diagram of the utility model low-voltage energy storage system in increasing direct current power supply power. DETAILED DESCRIPTION

[0040] The concept and the technical effects of the utility model will be described clearly and completely in combination with the embodiments, so that the purpose, features and effects of the utility model can be fully understood. Obviously, the described embodiments are only part of the embodiments of the utility model, but not all the embodiments. Based on the embodiments of the utility model, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0041] In the description of the embodiments of the utility model, if "several" is involved, it means one or more, if "multiple" is involved, it means two or more, if "greater than", "less than", "exceed" are involved, they should be understood as not including the number itself, if "and above", "and below", "within" are involved, they should be understood as including the number itself. If "first", "second" are involved, they should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0042] Referring to Figure 1The utility model embodiment provides a kind of multifunctional low voltage energy storage device, it includes shell, current transmission conversion unit, energy storage control unit, output switch unit and output selection switch;Wherein, shell is provided with cavity, current transmission conversion unit, energy storage control unit, output switch unit is respectively fixedly arranged in cavity, the surface of shell is embedded and is provided with alternating current incoming line interface, DC power supply interface and alternating current power supply interface.In the embodiment, alternating current incoming line interface is connected with current transmission conversion unit, for accessing external alternating current transmission to current transmission conversion unit, current transmission conversion unit is connected with the charge-discharge interface of energy storage control unit, the output end (AC output end) of current transmission conversion unit is connected with the input end of output switch unit, the output end of output switch unit is connected with alternating current power supply interface, the control end of energy storage control unit is connected with one end of output selection switch, another end of output selection switch output switch unit is connected.In need to output alternating current outward, by switching the state of output selection switch to alternating current output, and then, access external alternating current is output after current transmission conversion unit, and simultaneously, output direct current to energy storage control unit and charge;When not accessing external alternating current, external load needs alternating current power supply, energy storage control unit exports direct current to current transmission conversion unit after, current transmission conversion unit will receive the direct current into alternating current and be transmitted to alternating current power supply interface by output switch unit, and then alternating current power supply is carried out to external load;When external load needs DC power supply, by switching the state of output selection switch to direct current output, and then the input end of output switch unit is exported direct current to the charge-discharge interface of energy storage control unit after, direct current is transmitted to DC power supply interface by output switch unit, and then direct current power supply is provided for external load.The utility model embodiment a kind of multifunctional low voltage energy storage device, it selects output direct current or alternating current according to the power type of load, solves the technical problem of related art, energy storage device can only exist in single alternating current power supply mode or single direct current power supply mode, power supply mode is single, when user needs to equip two power supply modes, equipment cost is high, and the technical problem of poor applicability.

[0043] Reference Figure 2In some embodiments, to ensure the stability of the energy storage control unit, the safety and accuracy of the energy storage control unit in charging and discharging are ensured. In the embodiment, the energy storage control unit comprises an energy storage battery pack and a BMS controller; the BMS controller is connected with the energy storage battery pack; the energy storage battery pack is provided with a charging and discharging interface, the charging and discharging interface is connected with a current transmission conversion unit and an output switch unit respectively, the BMS controller is used to control the charging and discharging state of the energy storage battery pack, and can also monitor the power information of the energy storage battery pack and prevent overcharging or overdischarging of the energy storage battery pack. In the embodiment, the BMS controller is also connected with an output selection switch, and when the output selection switch selects the power supply state (DC output or AC output), the BMS controller can control the output switch unit to close to the corresponding DC power supply interface or AC power supply interface.

[0044] In some embodiments, to meet the function of the current transmission conversion unit in the above-mentioned embodiment to realize AC transmission and AC-to-DC conversion. In the embodiment, the current transmission conversion unit comprises an inverter; the AC incoming line interface is connected with the AC input interface of the inverter, the AC output interface of the inverter is connected with the input end of the output switch unit, and the DC input and output interface of the inverter is connected with the charging and discharging interface of the energy storage control unit, which is used to convert AC into DC to charge the energy storage control unit, or receive the DC output by the energy storage control unit and convert it into AC, and then transmit it to the AC power supply interface through the output switch unit, thereby realizing the AC power supply for external loads.

[0045] Referring to Figure 3In some embodiments, in order to stably provide alternating current or direct current for external loads, the output switch unit in the embodiment includes a first relay switch and a second relay switch, and the two relay switches are used to control alternating current output and direct current output respectively, so that the physical isolation output of alternating current and direct current can be realized. In the embodiment, the input end of the first relay switch is connected with the alternating current output end of the inverter (current transmission conversion unit), the output end of the first relay switch is connected with the alternating current power supply interface, and the control end of the first relay switch is connected with the output selection switch. When the output selection switch is switched to the alternating current output state, the BMS controller can control the first relay switch to be closed, and at this time, the alternating current output by the inverter is output to the alternating current power supply interface through the first relay switch, so that alternating current power supply for external loads is realized. The input end of the second relay switch is connected with the charge-discharge interface in the energy storage control unit, the output end of the second relay switch is connected with the direct current power supply interface, and the control end of the second relay switch is connected with the output selection switch. When the output selection switch is switched to the direct current output state, the BMS controller in the energy storage control unit can control the second relay switch to be closed, and at this time, the BMS controller controls the energy storage battery pack to output direct current to the second relay switch, and provides direct current power supply for external loads through the direct current power supply interface.

[0046] In some embodiments, the output selection switch described in the above embodiment is realized by a manual switch, which is embedded and fixedly arranged on the surface of the shell, so that when a user uses the multifunctional low-voltage energy storage device provided in the embodiment, the user can dial the manual switch to the corresponding output state according to the required power supply type of the external load.

[0047] Referring to Figure 4 In some embodiments, in order to facilitate the user to quickly charge and improve the use efficiency of the multifunctional low-voltage energy storage device provided in the embodiment and provide a good use experience for the user, the multifunctional low-voltage energy storage device further includes a direct current fast charging interface, which is embedded and arranged on the surface of the shell. The direct current fast charging interface is connected with the charge-discharge interface in the energy storage control unit, so that when the direct current fast charging interface is connected with an external direct current voltage source, the energy storage battery pack in the energy storage control unit can be quickly charged, and the storage capacity of the energy storage battery pack can be charged to a preset value in a shorter time.

[0048] Referring to Figure 5In some embodiments, to enhance the applicability of the multifunctional low-voltage energy storage device provided by the embodiment of the utility model, meet the demand of the user for greater power of direct current power supply, the multifunctional low-voltage energy storage device further comprises a parallel connection interface, the parallel connection interface is connected in parallel with the AC input interface, and the parallel connection interface is used to be connected to the AC input interface of another multifunctional low-voltage energy storage device, so that when external AC power is connected, the multifunctional low-voltage energy storage device of the upper level outputs AC power from the parallel connection interface to the AC input interface of the multifunctional low-voltage energy storage device of the lower level, thereby charging the multifunctional low-voltage energy storage device of the lower level, and realizing that when one external AC power is used, the multifunctional low-voltage energy storage devices can be charged at the same time, and the DC outputs of the multifunctional low-voltage energy storage devices are connected in series to provide high-power DC power supply for the load.

[0049] Referring to Figure 6 The working process of the multifunctional low-voltage energy storage device provided by the embodiment of the utility model is described below through a specific embodiment:

[0050] In the embodiment, when AC power supply is performed, the manual switch K1 is turned to the output AC power state, at this time, the BMS controller controls the first relay switch KM1 to be in the closed state (the initial state of the switch is the open state), the AC input interface is used to connect external AC power AC220V and pass through the inverter PCS, the inverter PCS outputs the received AC power to the AC power supply interface through the first relay switch KM1, thereby providing AC power supply for the external load AC220V, and at the same time, the inverter PCS converts the received AC power into DC power to charge the energy storage battery pack PACK; when external AC power is not connected and AC power supply is needed for the load, the BMS controller controls the energy storage battery pack PACK to output DC power to the inverter PCS, the inverter PCS converts the received DC power into AC power and outputs the AC power to the AC power supply interface through the first relay switch KM1, thereby providing AC power supply for the external load AC220V. When DC power supply is performed, the manual switch K1 is turned to the output DC power state, at this time, the BMS controller controls the second relay switch KM2 to be in the closed state, the BMS controller controls the energy storage battery pack PACK to output DC power to the DC power supply interface through the second relay switch KM2, thereby providing DC power supply for the external load DC48V; at the same time, when the external DC voltage source is connected to the DC fast charging interface, the energy storage battery pack PACK can be quickly charged.

[0051] Referring to Figure 7The utility model embodiment further provides a low pressure energy storage system, it includes first multi -functional low pressure energy storage device and second multi -functional low pressure energy storage device, first multi -functional low pressure energy storage device, second multi -functional low pressure energy storage device are all as the multifunctional low pressure energy storage device of elaborated in the above embodiment. The connection relation of first multi -functional low pressure energy storage device and second multi -functional low pressure energy storage device in this embodiment includes one or more of the following:

[0052] First multi -functional low pressure energy storage device and second multi -functional low pressure energy storage device are connected through first connecting wire, and then increase the alternating current power supply storage or direct current power supply storage of the low pressure energy storage system of the utility model embodiment;

[0053] And, first multi -functional low pressure energy storage device and second multi -functional low pressure energy storage device are connected through second connecting wire, and then increase the direct current power supply power of the low pressure energy storage system of the utility model embodiment.

[0054] The low pressure energy storage system of the utility model embodiment, through being provided with first multi -functional low pressure energy storage device and second multi -functional low pressure energy storage device, and then solve the single power supply mode of the single alternating current power supply or single direct current power supply of energy storage system in the related art, the technical problem of high equipment cost and poor applicability when user needs to equip two power supply modes.

[0055] The following are respectively through concrete embodiment to the low pressure energy storage system of application two multi -functional low pressure energy storage device composition is elaborated specifically, obviously low pressure energy storage system can also combine more quantity's multi -functional low pressure energy storage device according to demand, do not enumerate here:

[0056] Refer to Figure 8In some embodiments, the first connecting line is used to connect the AC power supply interface of the first multifunctional low-voltage energy storage device and the AC incoming line interface of the second multifunctional low-voltage energy storage device, and then when AC 220V is provided for the external load, the manual switch of the first multifunctional low-voltage energy storage device and the manual switch of the second multifunctional low-voltage energy storage device are both turned to the output AC power state, and then the first relay switch KM1 of the first multifunctional low-voltage energy storage device and the first relay switch KM1 of the second multifunctional low-voltage energy storage device are both in the closed state. Without connecting the external AC 200V, the power supply of the external load AC 220V is supplied by the energy storage battery pack PACK of the first multifunctional low-voltage energy storage device and the energy storage battery pack PACK of the second multifunctional low-voltage energy storage device, thereby increasing the AC power supply storage of the low-voltage energy storage system, and providing a larger time for the external load AC 220V. Similarly, when providing DC power for the external load AC 220V, the manual switch of the first multifunctional low-voltage energy storage device and the manual switch of the second multifunctional low-voltage energy storage device are both turned to the output DC power state, and without connecting the external AC 200V, the power supply of the external load DC 48V is supplied by the energy storage battery pack PACK of the first multifunctional low-voltage energy storage device and the energy storage battery pack PACK of the second multifunctional low-voltage energy storage device, thereby increasing the DC power supply storage of the low-voltage energy storage system, and providing a larger time for the external load DC 48V.

[0057] Referring to Figure 9 In some embodiments, the second connecting line is used to connect the DC power supply interface of the first multifunctional low-voltage energy storage device and the DC fast charging interface of the second multifunctional low-voltage energy storage device, thereby realizing the combination of the DC power output by the first multifunctional low-voltage energy storage device and the DC power output by the second multifunctional low-voltage energy storage device, and providing DC power supply for high-power external loads, preventing the current of the DC power output by a single multifunctional low-voltage energy storage device from being too small to meet the high-power external load.

[0058] Referring to Figure 9 In some embodiments, in order to realize charging of the first multifunctional low-voltage energy storage device and the second multifunctional low-voltage energy storage device at the same time, the low-voltage energy storage system further includes a third connecting line; the third connecting line is used to connect the parallel connection interface of the first multifunctional low-voltage energy storage device and the AC incoming line interface of the second multifunctional low-voltage energy storage device, and then when the AC incoming line interface of the first multifunctional low-voltage energy storage device is connected with the external AC 220V, the external AC 220V can simultaneously charge the first multifunctional low-voltage energy storage device and the second multifunctional low-voltage energy storage device.

[0059] The utility model embodiment has been explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, still can make various changes in the knowledge range of the ordinary skill in the art who possesses under the premise of not departing from the utility model's tenet. Besides, the embodiment and the feature in the embodiment of the utility model can be combined mutually under the condition of not conflicting.

Claims

1. A multi-functional low-voltage energy storage device, characterized by, The multifunctional low-voltage energy storage device comprises a shell, an AC power line interface, a current transmission conversion unit, an energy storage control unit, an output switch unit, and an output selection switch. The shell is provided with a cavity, and the AC power line interface is embedded in the shell and used for connecting an external AC power. The current transmission conversion unit is fixedly arranged in the cavity and connected with the AC power line interface, and used for receiving the external AC power. The energy storage control unit is fixedly arranged in the cavity and connected with the current transmission conversion unit, and used for receiving and storing electric energy or outputting DC power to the current transmission conversion unit. The output switch unit is fixedly arranged in the cavity, and the input end of the output switch unit is connected with the output end of the current transmission conversion unit and the charge-discharge interface of the energy storage control unit, and the output end of the output switch unit is connected with an AC power supply interface and a DC power supply interface. The output selection switch is fixedly arranged on the surface of the shell, one end of the output selection switch is connected with the control end of the energy storage control unit, and the other end of the output selection switch is connected with the control end of the output switch unit.

2. The multi-functional low-pressure energy storage device of claim 1, wherein, The energy storage control unit comprises an energy storage battery pack and a BMS controller. The BMS controller is connected with the energy storage battery pack, and used for controlling the charge-discharge state of the energy storage battery pack. The BMS controller is also connected with the output selection switch, and used for controlling the working state of the output selection switch, thereby controlling the working state of the output switch unit to realize AC power output or DC power output.

3. The multi-functional low-pressure energy storage device according to claim 1 or 2, characterized by, The output switch unit comprises a first relay switch and a second relay switch. The input end of the first relay switch is connected with the output end of the current transmission conversion unit, the output end of the first relay switch is connected with the AC power supply interface, and the control end of the first relay switch is connected with the output selection switch. The input end of the second relay switch is connected with the charge-discharge interface of the energy storage control unit, the output end of the second relay switch is connected with the DC power supply interface, and the control end of the second relay switch is connected with the output selection switch.

4. The multi-functional low-pressure energy storage device according to claim 1 or 2, characterized by, The current transmission conversion unit comprises an inverter. The AC input interface of the inverter is connected with the AC power line interface, the AC output interface of the inverter is connected with the input end of the output switch unit, and the DC input-output interface of the inverter is connected with the charge-discharge interface of the energy storage control unit.

5. The multi-functional low pressure energy storage device of claim 1, wherein, The multifunctional low-voltage energy storage device further comprises a DC fast charging interface. The DC fast charging interface is embedded in the shell, and the DC fast charging interface is connected with the charge-discharge interface of the energy storage control unit, and used for connecting an external DC voltage source to charge the energy storage control unit.

6. The multi-functional low pressure energy storage device of claim 5, wherein, The multifunctional low-voltage energy storage device further comprises a parallel connection interface. The parallel connection interface is embedded in the shell, and the parallel connection interface is connected with the AC power line interface in parallel, and the parallel connection interface is used for connecting to the AC power line interface of another multifunctional low-voltage energy storage device.

7. A low pressure energy storage system characterized in that, The low-voltage energy storage system comprises a first multifunctional low-voltage energy storage device and a second multifunctional low-voltage energy storage device, wherein the first multifunctional low-voltage energy storage device and the second multifunctional low-voltage energy storage device are the multifunctional low-voltage energy storage devices according to any one of claims 1 to 6; the connection relationship of the first multifunctional low-voltage energy storage device and the second multifunctional low-voltage energy storage device comprises one or more of the following: The first multifunctional low-voltage energy storage device and the second multifunctional low-voltage energy storage device are connected through a first connecting line to increase the alternating current power supply storage or direct current power supply storage of the low-voltage energy storage system; The first multifunctional low-voltage energy storage device and the second multifunctional low-voltage energy storage device are connected through a second connecting line to increase the direct current power supply of the low-voltage energy storage system.

8. The low pressure energy storage system of claim 7, wherein, The first connecting line is used to connect the alternating current power supply interface of the first multifunctional low-voltage energy storage device and the alternating current incoming line interface of the second multifunctional low-voltage energy storage device.

9. The low pressure energy storage system according to claim 7 or 8, characterized in that, The second connecting line is used to connect the direct current power supply interface of the first multifunctional low-voltage energy storage device and the direct current fast charging interface of the second multifunctional low-voltage energy storage device.

10. The low pressure energy storage system of claim 9, wherein, The low-voltage energy storage system further comprises a third connecting line, which is used to connect the parallel connection interface of the first multifunctional low-voltage energy storage device and the alternating current incoming line interface of the second multifunctional low-voltage energy storage device.

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