CN219843449U - Power storage device of power supply system and power supply system - Google Patents

Abstract

The utility model relates to energy storage technology, and discloses an electric storage device of a power supply system and the power supply system, comprising: the power supply system comprises a first voltage transformation unit, a second voltage transformation unit and a storage battery, wherein the input end of the first voltage transformation unit and the output end of the second voltage transformation unit are used for being electrically connected with a direct current bus of the power supply system, and the charge and discharge end of the storage battery is electrically connected with the output end of the first voltage transformation unit and the input end of the second voltage transformation unit; one end of the direct current bus is electrically connected with the direct current output end of the power supply system, and the other end of the direct current bus is electrically connected with a load of the data center. The utility model aims to improve the efficiency of starting the power storage device nearby to supply power to the load of the data center when the power supply system is abnormal in power supply of external energy sources, and is convenient for a plurality of power storage devices to directly and quickly realize parallel connection.

Description

Power storage device of power supply system and power supply system

Technical Field

The utility model relates to the technical field of energy storage, in particular to an electric storage device of a power supply system and the power supply system.

Background

The data center not only needs a large amount of power to maintain the operation of the server, the storage device, the backup device, the cooling system and other devices, but also needs to be provided with a corresponding storage battery in order to prevent the data center from being lost or damaging related devices due to sudden interruption of the supply of the commercial power accessed by the data center, so that the power supply system of the data center can be powered by the storage battery when the power is disconnected from the outside, and the normal operation of the data center is maintained.

At present, a power supply system is generally provided with a corresponding transformation unit (such as a DC/DC transformation unit and an AC/DC transformation unit) for a storage battery, and when the storage battery needs to be charged, the transformation unit needs to convert the voltage provided by a direct current bus of the power supply system into rated voltage meeting the charging requirement of the storage battery; when the power supply system loses power supply input (such as interruption of mains supply), the voltage supplied by the storage battery needs to be converted into working voltage matched with the load of the data center by the voltage transformation unit, namely, when the storage battery is charged or discharged, the voltage transformation unit needs to be controlled to be switched to a corresponding working mode firstly, so that when the power supply system is suddenly powered off, power cannot be supplied to the load of the data center through the storage battery immediately (namely, the voltage transformation unit needs to be controlled to be switched to the corresponding working mode firstly, the storage battery can supply power to the load of the data center), and the load of the data center has short power supply interruption, even if the duration of the power supply interruption is not long, the data center is difficult to keep normal operation continuously.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present utility model and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The utility model provides an electric storage device of a power supply system and the power supply system, which improve the efficiency of starting the electric storage device to supply power to a load of a data center when the power supply of an external energy source of the power supply system is abnormal.

In order to achieve the above object, the present utility model provides an electrical storage device of a power supply system, the electrical storage device includes a first transforming unit, a second transforming unit, and a battery, wherein an input end of the first transforming unit and an output end of the second transforming unit are electrically connected to a dc bus of the power supply system, and a charge and discharge end of the battery is electrically connected to an output end of the first transforming unit and an input end of the second transforming unit; one end of the direct current bus is electrically connected with the direct current output end of the power supply system, and the other end of the direct current bus is electrically connected with a load of the data center.

Optionally, the power storage device further comprises a switching device for cutting off current input and/or current output between the battery and the dc bus when the battery is not operating.

Optionally, the switching device includes a first switching device, and an input end of the first voltage transformation unit is electrically connected to the dc bus through the first switching device.

Optionally, the switching device includes a second switching device, and an output end of the second voltage transformation unit is electrically connected to the dc bus through the second switching device.

Optionally, the switching device includes a third switching device, and the charge and discharge end of the storage battery is electrically connected to the output end of the first voltage transformation unit and the input end of the second voltage transformation unit through the third switching device.

Optionally, the power storage device further includes two first interfaces electrically connected to an input end of the first voltage transformation unit and an output end of the second voltage transformation unit, respectively; the two first interfaces are detachably connected with the two second interfaces provided by the direct current bus.

The utility model further provides a power supply system which comprises a direct current source and a plurality of electric storage devices, wherein the direct current output end of the direct current source is electrically connected with the electric storage devices respectively.

The technical scheme of the utility model has the beneficial effects that: the first transformation unit is configured for charging the electric storage device of the power supply system, and the second transformation unit is configured for realizing external discharging of the electric storage device, so that when external energy accessed by the power supply system is normal in power supply, the first transformation unit charges according to the requirement of the electric storage device, and the second transformation unit is in an external discharging state at any time. In order to avoid circulating current from being formed by the first transforming unit when the power storage device is discharged, the second transforming unit may set the output voltage to be lower than the bus voltage. When the external energy supply is abnormal, the first voltage transformation unit is immediately disconnected to stop charging, and the second voltage transformation unit immediately discharges the load to ensure uninterrupted power supply of the load.

Because the charging and discharging of each electric storage device are controlled by the independent voltage transformation unit, the electric storage device can determine the working capacity according to the self condition, so the scheme supports any type of battery, and any new and old degree of battery is used in parallel, thereby providing a more flexible electric storage solution.

Optionally, each power storage device is provided with a self-management unit, and is communicated with the power supply system. The power supply system manages the whole system according to the battery condition, ensures the coordinated work of the system, and performs early warning when the fault or the power supply capability is insufficient.

Drawings

Fig. 1 is a schematic structural view of an embodiment of an electrical storage device of the present utility model;

fig. 2 is a schematic structural view of another embodiment of the power storage device of the utility model;

fig. 3 is a schematic structural view of a further embodiment of the power storage device of the utility model;

fig. 4 is a schematic structural view of a further embodiment of the power storage device of the utility model;

FIG. 5 is a schematic diagram showing the positional relationship between a first interface and a second interface of the power storage device according to the present utility model;

FIG. 6 is a schematic diagram of a power supply system according to an embodiment of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides an electric storage device of a power supply system, referring to fig. 1, the electric storage device comprises a first transformation unit, a second transformation unit and a storage battery, wherein the input end of the first transformation unit and the output end of the second transformation unit are used for being electrically connected with a direct current bus of the power supply system, and the charge and discharge end of the storage battery is electrically connected with the output end of the first transformation unit and the input end of the second transformation unit; one end of the direct current bus is electrically connected with the direct current output end of the power supply system, and the other end of the direct current bus is electrically connected with a load of the data center.

In this embodiment, the power storage device may be a power storage device disposed in a power supply system, where the power supply system may be a power supply system of a data center, a dc source is disposed in the power supply system, and a dc bus is disposed between a dc output end of the dc source and a load of the data center, so that the dc source may supply power to the load of the data center through the dc bus.

The DC source can be connected with external energy source (such as AC mains supply) and converts the external energy source into DC suitable for loads of the data center.

Optionally, the input end of the first voltage transformation unit can be used as the input end of the electric storage device and can be used for being electrically connected with the direct current bus, and the output end of the first voltage transformation unit is electrically connected with the charge and discharge ends of the storage battery; the output end of the second transformation unit can be used as the output end of the electric storage device and can be used for being electrically connected with a direct current bus, and the input end of the second transformation unit is electrically connected with the charge and discharge ends of the storage battery.

The current conducting direction of the first transformation unit is from the input end to the output end; the current conducting direction of the second voltage transformation unit is from the input end to the output end.

Optionally, the first voltage transformation unit is used for transforming the direct current voltage transmitted to the direct current bus by the power supply system into the rated charging voltage of the storage battery so as to charge the storage battery; the second transformation unit is used for converting the output voltage of the storage battery into a power supply voltage matched with the power supply requirement of the load.

The first voltage transformation unit and the second voltage transformation unit may be DC/DC (direct current to direct current) voltage power conversion units, and may perform step-up or step-down processing on the voltage.

Optionally, the first voltage transformation unit may convert the received dc voltage into a rated charging voltage adapted to the storage battery according to a preset working parameter; alternatively, the power storage device may further include a control unit (not shown in the figure), where the control end of the first voltage transformation unit is electrically connected to the control signal output end of the control unit and controlled by the control unit, so that the control unit may set the working parameters of the first voltage transformation unit by outputting a corresponding control signal to the first voltage transformation unit, so that the first voltage transformation unit may convert the received dc voltage into a corresponding dc voltage according to the charging requirement of the storage battery (i.e., the control unit may allocate the voltage converted by the first voltage transformation unit according to the charging requirement).

Optionally, the second voltage transformation unit may convert the dc voltage output by the storage battery into a supply voltage matched with the load power supply requirement according to a preset working parameter; alternatively, the power storage device may further include a control unit (not shown in the figure), where the control end of the second voltage transformation unit is electrically connected to the control signal output end of the control unit and controlled by the control unit, so that the control unit may set the working parameters of the second voltage transformation unit by outputting a corresponding control signal to the second voltage transformation unit, so that the second voltage transformation unit may convert the received dc voltage into a corresponding power supply voltage according to the power supply requirement of the load (i.e., the control unit may allocate the voltage converted by the second voltage transformation unit according to the power supply requirement).

Alternatively, when the direct current source of the power supply system can normally supply power, the voltage output by the direct current source can supply power to the load of the data center through the direct current bus. At this time, the first voltage transformation unit can take electricity from the direct current bus and convert the first voltage provided by the direct current source into the rated charging voltage of the storage battery so as to charge the storage battery. The second voltage transformation unit can be always in a discharging state, namely the second voltage transformation unit can continuously convert the output voltage of the storage battery into a second voltage and transmit the second voltage to the direct current bus. The second voltage is smaller than the first voltage (for example, the first voltage is 240V, the second voltage may be 220V), so that the voltage output by the second voltage transformation unit is smaller than the bus voltage, and the second voltage transformation unit has unidirectional conduction characteristics (the conduction direction is from the input end to the output end), so that the second voltage transformation unit cannot actually discharge the dc bus (i.e., the storage battery cannot discharge the dc bus through the second voltage transformation unit), and the high voltage of the dc bus cannot flow backward to the storage battery through the second voltage transformation unit.

Optionally, when the power supply of the dc source of the power supply system is abnormal (i.e., the external energy source accessed by the power supply system is abnormal (such as interruption of the mains supply input), resulting in abnormal power supply of the dc source), the first voltage output to the dc bus is reduced (even reduced to 0), so that when the first voltage is smaller than the second voltage output by the second voltage transformation unit, the storage battery can smoothly discharge the dc bus through the second voltage transformation unit, and the dc bus can continuously supply power to the load by using the current provided by the storage battery. When the storage battery discharges the direct current bus through the second transformation unit to continue supplying power to the load, the first transformation unit is controlled not to take electricity from the direct current bus (namely, the storage battery is not charged through the first transformation unit at the same time), so that current is prevented from circulating back to the storage battery.

Therefore, in some high-reliability application scenarios, the second voltage transformation unit in the discharging loop can be always in a conducting and output state, so that once the direct current bus is in power failure (namely, the power supply of an external energy source connected to a power supply system is abnormal), when the voltage provided by the direct current source cannot meet the power supply requirement of a load, the storage battery in the power storage device can immediately supply power to the load through the second voltage transformation unit, and uninterrupted operation of the load is maintained. The power supply system is basically free of time delay in the process of switching the power supply of the load by using the direct current source to the power supply of the load by using the power storage device, and the condition that the power supply system is used for supplying power to the load is avoided, so that the efficiency of starting the power storage device to supply power to the load of the data center when the power supply of the external energy source of the power supply system is abnormal is improved.

In an embodiment, a first voltage transformation unit special for charging the power storage device and a second voltage transformation unit special for realizing external discharging of the power storage device are configured for the power storage device of the power supply system, so that when the external energy power supply accessed by the power supply system is normal, the power storage device can be charged by using one voltage transformation unit, and meanwhile, the discharging voltage of the power storage device to the direct current bus is lower than the bus voltage, and once the external energy power supply accessed by the power supply system is abnormal, the power storage device can immediately realize the discharging to the direct current bus, so that the direct current bus can realize uninterrupted power supply to the load of the data center by utilizing the current provided by the storage battery, and the efficiency of starting the power storage device to supply power to the load of the data center when the external energy power supply of the power supply system is abnormal is improved.

In addition, the power storage device structure provided by the embodiment can also facilitate parallel arrangement of a plurality of power storage devices in the power supply system, and can also improve the power storage capacity of the power supply system. The power supply system can also meet the requirement that the power storage devices with different characteristics can be used in parallel, namely, the power storage devices with different rated voltages, different batches and even different types can be used in parallel.

Optionally, the first transformation unit charges according to the power storage device demand, and the second transformation unit is in an outward discharge state at any time. In order to avoid circulating current from being formed by the first transforming unit when the power storage device is discharged, the second transforming unit may set the output voltage to be lower than the bus voltage. When the external energy supply is abnormal, the first voltage transformation unit is immediately disconnected to stop charging, and the second voltage transformation unit immediately discharges the load to ensure uninterrupted power supply of the load.

Because the charging and discharging of each electric storage device are controlled by the independent voltage transformation unit, the electric storage device can determine the working capacity according to the self condition, so the scheme supports any type of battery, and any new and old degree of battery is used in parallel, thereby providing a more flexible electric storage solution.

Optionally, each of the power storage devices is provided with its own management unit (e.g., BMS (BATTERY MANAGEMENT SYSTEM, BATTERY management system)) in communication with the power supply system. The power supply system manages the whole system according to the battery condition, ensures the coordinated work of the system, and performs early warning when the fault or the power supply capability is insufficient.

In an embodiment, in addition to the above embodiment, the power storage device further includes a switching device for cutting off current input and/or current output between the battery and the dc bus when the battery is not operating.

In this embodiment, the power storage device may further be provided with at least one switching device for cutting off the current input and/or the current output between the battery and the dc bus when the battery is not operating.

Alternatively, a switching device may be provided between the input terminal of the first transforming unit and the dc bus, so that when the battery is not operated, the current input between the battery and the dc bus is cut off by the switching device. In this way, the power consumption of the first transforming unit can be reduced when the storage battery is not operating.

Alternatively, a switching device may be provided between the output terminal of the second transforming unit and the dc bus, so that the current output between the battery and the dc bus is cut off by the switching device when the battery is not operating. In this way, the power consumption of the second transforming unit can be reduced when the storage battery is not operating.

Optionally, a switching device may be disposed between the charge and discharge end of the battery and the output end of the first voltage transformation unit and the input end of the second voltage transformation unit, so that when the battery is not in operation, the switching device is used to cut off the current input and output between the battery and the dc bus. In this way, the power consumption of the first and second transforming units can be reduced when the storage battery is not operating.

It should be noted that when the battery does not need to be charged (e.g., the battery is fully charged) and the battery does not need to discharge the dc bus (i.e., the battery does not need to supply power to the load via the dc bus) (or when the battery fails), the battery is in a non-operating state.

In an embodiment, on the basis of the above embodiment, referring to fig. 2, the switching device includes a first switching device, and an input terminal of the first transforming unit is electrically connected to the dc bus via the first switching device.

In this embodiment, the switching device may include a first switching device.

Alternatively, the first switching device may be a lossless or low-loss controllable switching device such as a contactor, a relay, or the like. Wherein the power storage device may further include a control unit (not shown in the figure), a control signal output terminal of which is electrically connected to a control terminal of the first switching device, such that the control unit may control the first switching device to be turned on or off by outputting a corresponding control signal to the first switching device; and if the first switching device is in a closed state, the internal circuit between the two conducting ends of the first switching device is in a conducting state, and if the first switching device is in an open state, the internal circuit between the two conducting ends of the first switching device is in an open state.

One conducting end of the first switching device is electrically connected with the input end of the first transformation unit, and the other conducting end of the first switching device is electrically connected with the direct current bus. When the first switching device is controlled to be in a closed state, a line between the direct current bus and the first transformation unit can be conducted; when the first switching device is controlled to be in an off state, a line between the direct current bus and the first voltage transformation unit can be disconnected.

Optionally, when the control unit detects that the storage battery is not fully charged, the first switching device is controlled to be kept closed, so that the first transformation unit can take electricity from the direct current bus to charge the storage battery; when the control unit detects that the storage battery is fully charged, the first switching device can be controlled to be disconnected, so that the first voltage transformation unit is prevented from continuously taking electricity from the direct current bus, and the power consumption of the first voltage transformation unit is reduced.

In an embodiment, on the basis of the foregoing embodiment, referring to fig. 3, the switching device includes a second switching device, and an output terminal of the second voltage transformation unit is electrically connected to the dc bus via the second switching device.

In this embodiment, the switching device may include the second switching device, or include both the first switching device and the second switching device (as shown in fig. 3).

Alternatively, the second switching device may be a unidirectional conductive device, and the conductive direction is from a first conductive terminal of the second switching device to a second conductive terminal of the second switching device. The first conducting end of the second switching device is electrically connected with the output end of the second voltage transformation unit, and the second conducting end of the second switching device is electrically connected with the direct current bus.

When the direct current source of the power supply system supplies power normally, the power supply system can directly utilize the direct current source to supply power to a load through the direct current bus, and at the moment, the current provided by the direct current output end cannot flow to the storage battery pack through the second switching device and the branch where the second transformation unit is located due to the unidirectional conduction function of the second switching device; when the direct current source of the power supply system is abnormal in power supply, the storage battery pack needs to be started to discharge the direct current bus to supply power to the load, and the output current of the storage battery pack can flow to the direct current bus through the second transformation unit and the second switching device in sequence to supply power to the load.

Alternatively, the unidirectional conducting device may be a diode or a MOS transistor.

Optionally, if the second switching device is a diode, the first conducting end of the second switching device is an anode of the diode, and the second conducting end of the second switching device is a cathode of the diode, and the diode can automatically realize the closing or opening of the second switching device by automatically detecting the voltage difference between the anode and the cathode. When the direct current source of the power supply system supplies power normally, the power supply system can directly utilize a direct current source to supply power for a load through a direct current bus, and at the moment, the cathode voltage (namely the first voltage) of the diode is larger than or equal to the anode voltage (namely the second voltage obtained through conversion of the second transformation unit), so that the diode is in a cut-off state, and the current output by the storage battery through the second transformation unit cannot flow to the direct current bus through the second switching device, namely the storage battery is in a non-discharge state; when the direct current source of the power supply system is abnormal in power supply, the cathode voltage (namely the first voltage) of the diode is smaller than the anode voltage (namely the second voltage obtained by conversion of the second transformation unit), the diode is in a conducting state, and at the moment, the output current of the storage battery pack can flow to the direct current bus through the second transformation unit and the second switching device in sequence to supply power to the load.

Optionally, if the second switching device is a MOS transistor, the electrical storage device may further include a control unit (not shown in the figure), and a control signal output end of the control unit is electrically connected to a gate of the MOS transistor, where the control unit may control the MOS transistor to be turned on or off by outputting a corresponding control signal to the gate of the MOS transistor, so as to control the second switching device to be turned on or off. If the second switching device is a PMOS tube, the first conduction end of the second switching device is a drain electrode of the PMOS tube, and the second conduction end of the second switching device is a source electrode of the PMOS tube; if the second switching device is an NMOS tube, the first conduction end of the second switching device is the source electrode of the NMOS tube, and the second conduction end of the second switching device is the drain electrode of the NMOS tube.

Optionally, when the power supply of the direct current source of the power supply system is normal, the power supply system can directly utilize the direct current source to supply power to the load through the direct current bus, and the control unit controls the MOS tube to be in a cut-off state, so that the current output by the storage battery through the second transformation unit cannot flow to the direct current bus through the second switching device, and the storage battery is in a non-discharge state; when the direct current source of the power supply system is abnormal in power supply, the control unit controls the MOS tube to be in a conducting state, and at the moment, the output current of the storage battery pack can flow to the direct current bus through the second transformation unit and the second switching device in sequence so as to supply power to the load.

Alternatively, the second switching device may be a non-unidirectional conductive device having no loss or low loss, such as a contactor, a relay, or the like. Wherein the power storage device may further include a control unit (not shown in the figure), a control signal output terminal of which is electrically connected to a control terminal of the second switching device, such that the control unit may control the second switching device to be turned on or off by outputting a corresponding control signal to the second switching device; and if the second switching device is in a closed state, the internal circuit between the two conducting ends of the second switching device is in a conducting state, and if the second switching device is in an open state, the internal circuit between the two conducting ends of the second switching device is in an open state.

One conducting end of the second switching device is electrically connected with the output end of the second transformation unit, and the other conducting end of the second switching device is electrically connected with the direct current bus. When the second switching device is controlled to be in a closed state, a line between the direct current bus and the second transformation unit can be conducted; when the second switching device is controlled to be in an off state, a line between the direct current bus and the second voltage transformation unit can be disconnected.

Optionally, when the power supply of the direct current source of the power supply system is normal, the power supply system can directly utilize the direct current source to supply power to the load through the direct current bus, and the control unit controls the second switching device to be in an off state, so that the current output by the storage battery through the second transformation unit cannot flow to the direct current bus through the second switching device, and the storage battery is in a non-discharging state; when the direct current source of the power supply system is abnormal in power supply, the control unit controls the second switching device to be in a closed state, and at the moment, the output current of the storage battery pack can flow to the direct current bus through the second transformation unit and the second switching device in sequence to supply power to the load.

In an embodiment, referring to fig. 4, on the basis of the foregoing embodiment, the switching device includes a third switching device, and the charge and discharge end of the storage battery is electrically connected to the output end of the first voltage transformation unit and the input end of the second voltage transformation unit through the third switching device.

In this embodiment, the switching device may include a third switching device.

Alternatively, the third switching device may be a lossless or low-loss controllable switching device such as a contactor, a relay, or the like. Wherein the power storage device may further include a control unit (not shown in the figure) whose control signal output terminal is electrically connected to the control terminal of the third switching device, such that the control unit may control the third switching device to be turned on or off by outputting a corresponding control signal to the third switching device; and if the third switching device is in a closed state, the internal circuit between the two conducting ends of the third switching device is in a conducting state, and if the third switching device is in an open state, the internal circuit between the two conducting ends of the third switching device is in an open state.

One conducting end of the third switching device is electrically connected with the output end of the first transformation unit and the input end of the second transformation unit respectively, and the other conducting end of the third switching device is electrically connected with the charging and discharging end of the storage battery. When the third switching device is controlled to be in a closed state, a circuit between the storage battery and the first transformation unit and a circuit between the storage battery and the second transformation unit can be conducted; when the third switching device is controlled to be in an off state, a circuit between the storage battery and the first voltage transformation unit and a circuit between the storage battery and the second voltage transformation unit can be disconnected.

Optionally, when the control unit detects that the storage battery is not fully charged, or when the storage battery needs to discharge to the direct current bus, the third switching device is controlled to be kept closed, so that the first voltage transformation unit can charge the storage battery, or the storage battery can discharge to the direct current bus through the second voltage transformation unit, so that normal operation of the load is maintained.

Alternatively, when the control unit detects that the storage battery is fully charged, and when the storage battery does not need to discharge to the direct current bus, the third switching device can be controlled to be turned off so as to overcharge the storage battery.

Or when the control unit detects the fault of the storage battery, the third switching device can be controlled to be switched off in time so as to avoid the fault storage battery from affecting other components in the power storage device, namely, avoid the fault storage battery from damaging other components.

The power storage device shown in fig. 2 to 4 is merely an exemplary structure, and the first switching device, the second switching device, and the third switching device may be provided in the power storage device in any combination or alone, and are not limited to the case shown in fig. 2 to 4.

In an embodiment, on the basis of the foregoing embodiment, referring to fig. 5, the electrical storage device further includes two first interfaces respectively electrically connected to an input end of the first voltage transformation unit and an output end of the second voltage transformation unit; the two first interfaces are detachably connected with the two second interfaces provided by the direct current bus.

In this embodiment, two first interfaces are provided in the power storage device, where one first interface is used to electrically connect to the input end of the first voltage transformation unit and is used as an electrical contact of the input end of the first voltage transformation unit; the other first interface is used for being electrically connected with the output end of the second transformation unit and is used as an electrical contact of the output end of the second transformation unit. In addition, the direct current bus is also provided with two second interfaces matched with the first interfaces, and the two second interfaces can be used as two electric contacts of the direct current bus.

Optionally, the first interfaces and the second interfaces are detachably connected, and when the two first interfaces are in butt joint with the two second interfaces, the input end of the first transformation unit is electrically connected with the direct current bus, and the output end of the second transformation unit is electrically connected with the direct current bus; when the two first interfaces and the two second interfaces lose contact, the channel between the input end of the first transformation unit and the direct current bus is disconnected, and the channel between the output end of the second transformation unit and the direct current bus is disconnected.

The detachable connection mode is not limited to the modes of plug connection, magnetic attraction connection, lamination connection and the like.

The first interface and the second interface can form a travel switch between the power storage device and the direct current bus, so that a user can conveniently connect the power storage device to the direct current bus or can conveniently separate the power storage device from the direct current bus.

Moreover, when the first interface and the two second interfaces lose contact (i.e. the power storage device is not connected to the direct current bus), the internal circuit of the power storage device cannot form a passage, so that the internal circuit of the power storage device does not generate loss, and the input end and the output end of the power storage device are not electrified, so that the safety in transportation and storage can be improved when the power storage device is in a single state.

Referring to fig. 6, a power supply system according to the present utility model further includes a dc source and a plurality of power storage devices, where the power storage devices are the power storage devices described in the foregoing embodiments, the dc source is provided with dc output ends corresponding to the number of the power storage devices, a dc bus is disposed between each dc output end and a load of the data center, and the dc bus corresponding to each dc output end is further electrically connected to at least one power storage device.

It should be noted that, the specific structure of any one of the power storage devices in the power supply system may refer to the above embodiments, and since the power supply system adopts all the technical solutions of all the embodiments, at least all the technical effects brought by the technical solutions of the embodiments are provided, and will not be described in detail herein.

Optionally, a plurality of dc output ends may be disposed in the dc source, and a dc bus is disposed between each dc output end and each load of the data center, so that the dc power output by the dc output ends may be delivered to the load through the dc bus, where at least one power storage device may be electrically connected to the dc bus between each dc output end and the load.

Optionally, an external energy conversion module and a power distribution control module may be disposed in the dc source, where the external energy conversion module is used to access an external energy source and convert the external energy source into dc; the power distribution control module is used for distributing and outputting the converted direct current to each direct current bus through the direct current output end.

In addition, the power distribution control module can also protect overload, short circuit and electric leakage of the circuit.

The power supply system can also meet the requirement that the power storage devices with different characteristics can be used in parallel, namely, the power storage devices with different rated voltages, different batches and even different types can be used in parallel.

The above description of the preferred embodiments of the present utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and adaptations of the present utility model using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present utility model to other relevant arts and technologies.

Claims (7)

1. The power storage device of the power supply system is characterized by comprising a first voltage transformation unit, a second voltage transformation unit and a storage battery, wherein the input end of the first voltage transformation unit and the output end of the second voltage transformation unit are used for being electrically connected with a direct current bus of the power supply system, and the charge and discharge end of the storage battery is electrically connected with the output end of the first voltage transformation unit and the input end of the second voltage transformation unit; one end of the direct current bus is electrically connected with the direct current output end of the power supply system, and the other end of the direct current bus is electrically connected with a load of the data center.

2. The power storage device of a power supply system according to claim 1, characterized in that the power storage device further comprises a switching device for cutting off a current input and/or a current output between the battery and the dc bus when the battery is not operating.

3. The power storage device of the power supply system according to claim 2, wherein the switching device includes a first switching device, and an input terminal of the first transforming unit is electrically connected to the dc bus via the first switching device.

4. A power storage device of a power supply system according to claim 2 or 3, wherein the switching device includes a second switching device, and an output terminal of the second transforming unit is electrically connected to the dc bus via the second switching device.

5. The power storage device of the power supply system according to claim 2, wherein the switching device includes a third switching device, and the charge-discharge end of the storage battery is electrically connected to the output end of the first transforming unit and the input end of the second transforming unit via the third switching device.

6. The power storage device of a power supply system according to claim 1, characterized in that the power storage device further comprises two first interfaces electrically connected to an input terminal of the first transforming unit and an output terminal of the second transforming unit, respectively; the two first interfaces are detachably connected with the two second interfaces provided by the direct current bus.

7. A power supply system comprising a direct current source, and a plurality of the power storage devices according to any one of claims 1 to 6, wherein a direct current output terminal of the direct current source is electrically connected to a plurality of the power storage devices, respectively.