CN220570342U - Battery device with multiple power storage modules connected in parallel and power supply system - Google Patents

Abstract

The utility model relates to an energy storage technology and discloses a battery device with multiple power storage modules connected in parallel and a power supply system, wherein the battery device comprises a direct current input end, a control unit, a plurality of power storage modules, a first switch module, a second switch module and at least one third switch module, wherein the direct current input end is used for being connected with a direct current source, the first switch module and the second switch module are sequentially connected in series between the direct current input end and a first conducting end of the third switch module, a second conducting end of the third switch module is used for being connected with a load, the input end of each power storage module is connected to a passage between the first switch module and the second switch module, and the output end of each power storage module is electrically connected with the first conducting end of the third switch module. The utility model aims to provide a battery device with multiple power storage modules connected in parallel, which realizes uninterrupted power supply of the battery device to a load so as to ensure the stability of the battery device in power supply to the load.

Description

Battery device with multiple power storage modules connected in parallel and power supply system

Technical Field

The utility model relates to the technical field of energy storage, in particular to a battery device with multiple power storage modules connected in parallel and a 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, in order to meet huge power supply requirements of a data center, a plurality of storage batteries are often required to be equipped for the data center, and the storage batteries are connected in series to form a storage battery pack, but in this way, once one storage battery fails, other storage batteries cannot supply power for loads of the data center, the storage batteries are connected in series, and the storage batteries are easy to cause failure occurrence of high-temperature ignition caused by overhigh electric quantity, even chain reaction is generated, other storage batteries are involved, other storage batteries are burnt out or short-circuited are caused, and therefore, the storage batteries cannot supply power for loads, and certain equipment loss is caused.

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 a battery device with multiple power storage modules connected in parallel and a power supply system, and aims to provide a battery device with multiple power storage modules connected in parallel, so that uninterrupted power supply of the battery device to a load is realized, and the stability of the battery device in power supply to the load is ensured.

In order to achieve the above object, the present utility model provides a battery device with multiple power storage modules connected in parallel, the battery device includes a dc input end, a control unit, a plurality of power storage modules, a first switch module, a second switch module and at least one third switch module, where the dc input end is used for accessing a dc source, the first switch module and the second switch module are sequentially connected in series between the dc input end and a first conducting end of the third switch module, a second conducting end of the third switch module is used for accessing a load, an input end of each power storage module is connected to a path between the first switch module and the second switch module, an output end of each power storage module is electrically connected to the first conducting end of the third switch module, and a communication end and/or a control output end of the control unit is electrically connected to the third switch module and the power storage module.

Optionally, the first switch module includes a unidirectional conduction device, and a conduction direction of the unidirectional conduction device is a direction from the dc input end to the load;

the second switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

Optionally, the first switch module further includes a second normally open switch, and the second normally open switch and the unidirectional conduction device are connected in parallel between the dc input end and the second switch module.

Optionally, the second switch module includes a unidirectional conduction device, and a conduction direction of the unidirectional conduction device is a direction from the dc input end to the load;

the first switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

Optionally, the second switch module further includes a second normally open switch, and the second normally open switch and the unidirectional conduction device are connected in parallel between the first switch module and the third switch module.

Optionally, the unidirectional conduction device is a diode;

or, the unidirectional conduction device is a MOS tube, and the control output end of the control unit is also electrically connected with the control end of the MOS tube.

Optionally, the power storage module is connected to the battery device in a detachable electrical connection manner.

The utility model further provides a power supply system, which comprises a direct current source and a plurality of battery devices, wherein the battery devices are the battery devices connected in parallel with the multi-power storage module, and the direct current output end of the direct current source is electrically connected with the direct current input end of each battery device.

The technical scheme of the utility model has the beneficial effects that: through setting up a plurality of parallelly connected electric power storage modules in battery device, not only can improve the storage capacity of single battery device to a certain extent, so when the unable normal power supply of load of external power source just can make the power supply capacity of battery device satisfy the power supply demand of the load that its access was met as far as possible, and when there is any electric power storage module trouble in it, still can enable to start other electric power storage modules and continue to supply power for the load, thereby guarantee that the battery device no matter there is external power input, still can make its load that inserts continuously uninterrupted operation, so as to guarantee the stability of battery device for the load power supply, and through parallelly connected dispersion setting of electric power storage module in the battery device, also can reduce to a certain extent and lead to the easy high temperature risk of firing of battery because of battery power is too high, avoid causing the battery to fire and damage equipment and avoid the battery device unable condition emergence of continuously supplying power for the load.

Drawings

FIG. 1 is a schematic diagram of a multi-module parallel battery device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of another embodiment of a multi-module parallel battery device according to the present utility model;

fig. 3 is a schematic structural view of another embodiment of a battery device with multiple power storage modules connected in parallel according to the present utility model;

fig. 4 is a schematic structural view of a battery device with multiple power storage modules connected in parallel according to another embodiment of the present utility model;

fig. 5 is a schematic view showing the structure of an electricity storage module of the battery device with multiple electricity storage modules connected in parallel according to the present utility model;

fig. 6 is a schematic structural diagram of the power supply system 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 a battery device with multiple power storage modules connected in parallel, which comprises a direct current input end, a control unit, a plurality of power storage modules, a first switch module, a second switch module and at least one third switch module, wherein the direct current input end is used for being connected with a direct current source, the first switch module and the second switch module are sequentially connected in series between the direct current input end and a first conducting end of the third switch module, a second conducting end of the third switch module is used for being connected with a load, an input end of each power storage module is connected to a passage between the first switch module and the second switch module, an output end of each power storage module is electrically connected with the first conducting end of the third switch module, and a communication end and/or a control output end of the control unit is electrically connected with the third switch module and the power storage module.

In this embodiment, the battery device may be a battery device disposed in a power supply system, and the power supply system may provide a direct current source for the battery device.

Optionally, the power supply system may be a power supply system of a data center, and may supply power to a load of the data center through a dc source, where the battery device may be disposed on a dc bus between the dc source and the load; the direct current source can be used for accessing external energy sources (such as alternating current commercial power) and converting the external energy sources into direct current suitable for loads of the data center.

Optionally, the dc input terminal of the battery device is configured to be connected to the dc output terminal of the dc source, so that the dc output from the dc output terminal of the dc source can be input to the battery device through the dc input terminal of the battery device.

Optionally, the control unit may be a control system of the battery device, or a device such as a single-chip microcomputer with a control function, where the power supply end of the control unit may be electrically connected to a dc input end (not shown in the figure), so that when the power supply of the dc input end is normal (i.e., the power supply system has an external energy input, so that the dc source may have a voltage input to the dc input end of the battery device), the control unit may draw power from the dc input end; alternatively, the power supply end of the control unit may be electrically connected to an output end (not shown in the figure) of the power storage module in the battery device, so that the control unit may take power from the power storage module when the power supply at the dc input end is abnormal; of course, the control unit may also be powered by other means (e.g., a built-in button cell).

The control unit in the battery device can be used for monitoring and controlling the battery device to which the control unit belongs (such as monitoring the storage capacity of the storage module, monitoring the current of any circuit of the battery device, or controlling the conduction mode of the switching gating module), and is responsible for the management work of the battery device (such as controlling the charge and discharge of each storage module).

Optionally, the control unit may be provided with a plurality of communication terminals and/or control output terminals; the communication end is used for acquiring circuit related data such as the electric quantity of the storage battery of each storage module, the current of any circuit of the battery device and the like, and the control output end is used for controlling the operation of each module unit in the circuit.

Optionally, the first switch module includes a unidirectional conduction device; the second switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

Alternatively, the second switch module includes a unidirectional conductive device; the first switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

The one-way conduction device is connected with the load through the direct current input end; the unidirectional conduction device can be controllable (such as a MOS tube) or uncontrollable (such as a diode), and if the controllable unidirectional conduction device is arranged, the control output end of the control unit needs to be electrically connected with the control end of the unidirectional conduction device, so that the control unit can control the unidirectional conduction device to be turned on or turned off by outputting a corresponding control signal.

Optionally, the first switch module and the second switch module are sequentially connected in series between the direct current input end and the first conducting end of the third switch module.

Optionally, one or more third switch modules may be disposed in the battery device, where the first conducting end of each third switch module is electrically connected to the second switch module, and the second conducting end of each third switch module is used for accessing at least one path of load.

Optionally, the control output end of the control unit is electrically connected to the control end of the third switch module, so that the third switch module can be controlled to be turned on or turned off by outputting a corresponding control signal to the control end of the third switch module.

Optionally, the third switch module may also be a normally open switch (such as a normally open contactor and a normally open relay), and when the third switch module does not receive the control signal output by the control unit, the third switch module maintains an off state; when the third switch module receives the control signal output by the control unit, the third switch module keeps a closed state.

When the third switch module is closed, a passage can be formed between the first conducting end and the second conducting end of the third switch module; when the third switch module is disconnected, an open circuit is formed between the first conducting end and the second conducting end of the third switch module.

Optionally, when the load to which the third switch module is connected has a power supply requirement, the control unit may control the third switch module to be in a closed state. When the load connected with the third switch module has no power supply requirement, the control unit can be informed to control the third switch module to be disconnected.

Optionally, the number of the power storage modules provided in the battery device is at least two; the configuration shown in fig. 1 or 2 is merely an exemplary configuration, and should not be construed as limiting the present embodiment, and the number of power storage modules may be greater than two.

Optionally, the input end of each power storage module is electrically connected to the dc input end through the first switch module, and the output end of each power storage module is electrically connected to the first conducting end of the third switch module.

Optionally, when the dc input end has a power input (i.e. when the dc source supplies power normally), the current input by the dc input end may flow to the load sequentially through the first switch module, the second switch module and the third switch module (at this time, the first switch module and the second switch module are turned on, and the control unit controls the third switch module to be turned on), so as to supply power to the load. At this time, if the control unit detects that any of the power storage modules is not fully charged, the current input by the dc input end may also be used to charge the power storage module that is not fully charged through the first switch module.

Optionally, when no power is input to the dc input end (i.e., when the dc source is powered abnormally), the control unit may enable at least one power storage module in the battery device to supply power to the load to which the battery device is connected, where the specific number of power storage modules is enabled, depending on the actual power supply requirement of the load, so as to ensure that the power storage modules enabled in the battery device sufficiently meet the power supply requirement of the load, thereby achieving uninterrupted power supply to the load. At this time, if the first switch module is a first normally open switch and the second switch module includes a unidirectional conduction device, the current output by the power storage module can be prevented from flowing backward to the input end or the direct current input end of the power storage module due to the unidirectional conduction characteristic (the conduction direction is the direction from the direct current input end to the load) of the unidirectional conduction device; the first switch module is used as a main switch of the battery device, and is controlled to be in a conducting state (or is controlled to be closed) as long as the load needs to be supplied with power and/or the power storage module needs to be charged, and is controlled to be disconnected only when the load does not need to be supplied with power and the power storage module does not need to be charged, so that the overall power consumption of the battery device is reduced. Or if the first switch module comprises a unidirectional conduction device and the second switch module is a first normally open switch, the second switch module needs to be controlled to be disconnected so as to prevent the current output by the power storage module from flowing backward to the input end or the direct current input end of the power storage module, and the first switch module has the function of preventing the current flowing backward due to the sudden attenuation of the electric energy input by the direct current input end when the electric energy input by the direct current input end is insufficient to supply power to a load and the power storage module needs to be used for supplying power to the load together, so that the unidirectional conduction of the first switch module (the conduction direction is the direction from the direct current input end to the load) can be avoided.

In an embodiment, by arranging a plurality of parallel power storage modules in the battery device, the power storage amount of a single battery device can be improved to a certain extent, so that when an external power supply cannot normally supply power to a load, the power supply amount of the battery device can meet the power supply requirement of the load connected with the battery device as much as possible, and when any power storage module fails, other power storage modules can still be started to supply power to the load, so that whether the battery device has external power supply input or not, the connected load can continuously and uninterruptedly run, the stability of the battery device for supplying power to the load is ensured, and the risk of easy high-temperature ignition of the battery due to overhigh battery power can be reduced to a certain extent, the occurrence of the conditions that the equipment is damaged due to ignition of the battery and the battery device cannot continuously supply power to the load is avoided.

And through setting up first switch module and second switch module to carry out corresponding control operation according to different scenes, can reduce the consumption of battery device or prevent the condition emergence of electric current backward flow.

In an embodiment, on the basis of the foregoing embodiment, the first switch module includes a unidirectional conduction device, and a conduction direction of the unidirectional conduction device is a direction from the dc input terminal to the load;

the second switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

Optionally, referring to fig. 3, the first switch module further includes a second normally open switch, and the second normally open switch and the unidirectional conduction device are connected in parallel between the dc input terminal and the second switch module.

The second switch module is a first normally open switch, and the control output end of the control unit can control the second switch module to be closed or opened by outputting a corresponding control signal.

Optionally, only one unidirectional conducting device may be provided in the first switch module; the first switch module may be provided with a unidirectional conduction device and a second normally open switch in parallel.

The unidirectional conduction device can be a diode or an MOS tube; the second normally open switch may be a normally open contactor, relay, or the like.

Optionally, if the unidirectional conducting device in the first switch module is a diode, an anode of the diode is electrically connected to the dc input terminal, and a cathode of the diode is electrically connected to the input terminals of the second switch module and the power storage module. When the power supply of the direct current input end is normal, the anode voltage of the diode is enabled to be larger than the cathode voltage, the diode is further enabled to be conducted, the first switch module is enabled to be conducted, meanwhile, the control unit controls the second switch module and the third switch module to be closed, and accordingly, a passage can be formed among the direct current input end and the load through controlling the first switch module, the second switch module and the third switch module, so that current input by the direct current input end flows to the load, and/or the electricity storage module is charged; when the power supply of the direct current input end is abnormal and no external power supply is input, the control unit can start at least one electric storage module in the battery device to supply power for a load connected with the battery device and control the second switch module to be disconnected so as to prevent the current output by the electric storage module from flowing backwards to the input end or the direct current input end of the electric storage module; when the power supply of the direct current input end is insufficient and the power storage module is needed to supply power to a load together, the second switch module is controlled to be conducted, and at the moment, the unidirectional conduction effect of the first switch module (the conduction direction is from the direct current input end to the load direction) can avoid current backflow caused by sudden attenuation of electric energy input by the direct current input end.

Alternatively, an MOS transistor may be used instead of the diode as a unidirectional conduction device, and the control output end of the control unit is electrically connected to the gate of the MOS transistor; if the MOS tube is a PMOS tube, the drain electrode of the PMOS tube is electrically connected with the direct current input end, and the source electrode of the PMOS tube is electrically connected with the input ends of the second switch module and the electric storage module; if the MOS tube is an NMOS tube, a source electrode of the NMOS tube is electrically connected with a direct current input end, and a drain electrode of the NMOS tube is electrically connected with the input ends of the second switch module and the power storage module. The control unit can correspondingly control the first switch module to be closed or opened according to the needs by controlling the MOS tube to be switched on or switched off.

Optionally, if the first switch module is provided with a unidirectional conduction device and a second normally open switch in parallel, two conduction ends of the second normally open switch are respectively and electrically connected with the direct current input end and the second switch module (equivalent to a parallel circuit formed by the unidirectional conduction device in the first switch module and the second normally open switch), and a control end of the second normally open switch is further electrically connected with a control output end of the control unit, and the control unit can output a corresponding control signal to the second normally open switch to control the second normally open switch to be opened or closed.

Optionally, when the power supply at the dc input end is abnormal, the control unit may control the power storage module to discharge to the load, where the control unit may control the second normally open switch in the first switch module to be in an off state, and make the unidirectional conducting device be in an off state, so that the first switch module is in an off state (i.e., the first conducting end and the second conducting end of the first switch module cannot be conducted), so that the current output from the power storage module to the load by the third switch module will not flow backward to the dc input end.

Optionally, after the battery device is started, the second normally open switch is kept normally open, and when the normal power supply of the direct current input end is detected, the unidirectional conduction device in the first switch module is conducted first, so that the first switch module is closed, and at the moment, the current input by the direct current input end can flow to the load and/or the power storage module through the unidirectional conduction device in the first switch module. At this time, after the control unit monitors that the power supply of the direct current input end is stable, the second normally open switch can be further controlled to be closed, at this time, because the branch loss corresponding to the second normally open switch is lower than that of the unidirectional conduction device, the current input by the direct current input end can bypass the branch where the unidirectional conduction device is located and flow to the load and/or the power storage module through the branch where the second normally open switch is located (at this time, if the unidirectional conduction device is an MOS tube, the MOS tube can be simultaneously controlled to be cut off, and if the unidirectional conduction device is a diode, the unidirectional conduction device can not be conducted due to the fact that the voltages at two ends of the anode and the cathode are equal), so that the circuit loss is reduced.

Or when the direct current input end and the electric storage module are required to supply power to the load in a combined way, in order to prevent the current from flowing backward due to sudden attenuation of the electric energy input by the direct current input end, the second normally open switch needs to be controlled to be in an off state (at the moment, the current input by the direct current input end flows to the second switch module through the unidirectional conduction device in the first switch module, and the unidirectional conduction device can play a role in preventing the current from flowing backward).

Optionally, when the battery device does not need to supply power to the load and/or does not need to charge the power storage module, the second normally open switch is controlled to be turned off (at this time, if the unidirectional conduction device is an MOS tube, the MOS tube can be controlled to be turned off at the same time, so as to reduce the overall power consumption of the battery device).

In an embodiment, on the basis of the foregoing embodiment, the second switch module includes a unidirectional conduction device, and a conduction direction of the unidirectional conduction device is a direction from the dc input terminal to the load;

the first switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

Optionally, referring to fig. 4, the second switch module further includes a second normally open switch, and the second normally open switch and the unidirectional conduction device are connected in parallel between the first switch module and the third switch module.

The first switch module is a first normally open switch, and the control output end of the control unit can control the first switch module to be closed or opened by outputting a corresponding control signal.

Alternatively, only one unidirectional conducting device can be arranged in the second switch module; the second switch module may be provided with a unidirectional conduction device and a second normally open switch in parallel.

The unidirectional conduction device can be a diode or an MOS tube; the second normally open switch may be a normally open contactor, relay, or the like.

Optionally, if the unidirectional conducting device in the second switch module is a diode, an anode of the diode is electrically connected to the first switch module, and a cathode of the diode is electrically connected to the third switch module and an output end of the power storage module. When the power supply of the direct current input end is normal, the first switch module (namely the first normally open switch) is controlled to be conducted, so that the anode voltage of a diode in the second switch module is larger than the cathode voltage, the diode is further conducted, the second switch module is conducted, meanwhile, the control unit controls the third switch module to be closed, and accordingly the first switch module, the second switch module and the third switch module can be controlled to form a passage between the direct current input end and the load, and current input by the direct current input end flows to the load; when the power supply of the direct current input end is abnormal and no external power supply is input, the control unit can start at least one electric storage module in the battery device to supply power for a load connected with the battery device, and at the moment, because of the unidirectional conduction characteristic (the conduction direction is the direction from the direct current input end to the load) of the unidirectional conduction device in the second switch module, the current output by the electric storage module can be prevented from flowing backwards to the input end or the direct current input end of the electric storage module; when the power supply of the direct current input end is insufficient and the power storage module is needed to supply power to the load together, the current backflow caused by sudden attenuation of the electric energy input by the direct current input end can be avoided due to the unidirectional conduction effect of the second switch module. At this time, the first switch module is used as a main switch of the battery device, and if the load needs to be powered and/or the power storage module needs to be charged, the first switch module is controlled to be kept in a conducting state, and only when the load does not need to be powered and the power storage module does not need to be charged, the first switch module is controlled to be disconnected, so that the overall power consumption of the battery device is reduced.

Alternatively, an MOS transistor may be used instead of the diode as a unidirectional conduction device, and the control output end of the control unit is electrically connected to the gate of the MOS transistor; if the MOS tube is a PMOS tube, the drain electrode of the PMOS tube is electrically connected with the first switch module, and the source electrode of the PMOS tube is electrically connected with the output ends of the third switch module and the power storage module; if the MOS tube is an NMOS tube, a source electrode of the NMOS tube is electrically connected with the first switch module, and a drain electrode of the NMOS tube is electrically connected with the output ends of the third switch module and the power storage module. The control unit controls the on or off of the MOS tube, and can correspondingly control the on or off of the second switch module according to the requirement.

Optionally, if the second switch module is provided with a unidirectional conduction device and a second normally open switch in parallel, two conduction ends of the second normally open switch are respectively and electrically connected with the first switch module and the third switch module (equivalent to a parallel circuit formed by the unidirectional conduction device in the second switch module and the second normally open switch), and a control end of the second normally open switch is further electrically connected with a control output end of the control unit, and the control unit can output a corresponding control signal to the second normally open switch to control the second normally open switch to be opened or closed.

Optionally, when the power supply of the dc input end is abnormal, the control unit needs to control the power storage module to discharge to the load, the control unit may control the second normally open switch in the second switch module to be in an off state, and make the unidirectional conducting device be in an off state, so that the second switch module is in an off state, and thus the current output by the power storage module to the load through the third switch module will not flow backward to the dc input end and the input end of the power storage module.

Optionally, after the battery device is started, the first switch module is controlled to be turned on, and the second normally open switch is kept normally open. When the normal power supply of the direct current input end is detected, the unidirectional conduction device in the second switch module is conducted firstly, so that the second switch module is closed (or conducted), and at the moment, the current input by the direct current input end can flow to the third switch module through the unidirectional conduction device in the second switch module. At this time, after the control unit monitors that the power supply of the direct current input end is stable, the second normally open switch can be further controlled to be closed, at this time, because the branch loss corresponding to the second normally open switch is lower than that of the unidirectional conduction device, the current output by the direct current input end through the first switch module can bypass the branch where the unidirectional conduction device is located, and flow to the load through the branch where the second normally open switch is located (at this time, if the unidirectional conduction device is an MOS tube, the MOS tube can be simultaneously controlled to be cut off, and if the unidirectional conduction device is a diode, the unidirectional conduction device can not be conducted due to the fact that the voltages at two ends of the anode and the cathode are equal), so that the circuit loss is reduced.

Or when the direct current input end and the electric storage module are required to supply power to the load in a combined way, in order to prevent the current from flowing backward due to sudden attenuation of the electric energy input by the direct current input end, the second normally open switch needs to be controlled to be in an off state (at this time, the current input by the direct current input end flows to the third switch module through the unidirectional conduction device in the first switch module and the second switch module, and the unidirectional conduction device can play a role in preventing the current from flowing backward).

Optionally, when the battery device does not need to supply power to the load and/or does not need to charge the power storage module, the first switch module is controlled to be turned off, and the second normally open switch in the second switch module is controlled to be turned off.

In an embodiment, on the basis of the above embodiment, the power storage module is connected to the battery device in a detachable electrical connection manner.

Optionally, a plurality of first interfaces suitable for the insertion of the power storage modules are arranged in the battery device, and first contacts corresponding to connecting wires of modules and units required to be electrically connected with the power storage modules in the battery device are arranged in the interfaces; the power storage module has a second interface adapted to the first interface, and a second contact corresponding to the first contact is provided in the second interface (the second contact is a contact of a connecting wire required to be connected with other modules and units of the battery device in the power storage module).

The first contact and the second contact are electrically connected when the power storage module is inserted into the battery device through connection of the second interface and the first interface, and the power storage module can be connected into the battery device in a detachable electrical connection mode. In this way, the power storage module can be easily increased or decreased and replaced in the battery device.

It should be noted that, the above manner of implementing the detachable electrical connection manner of the power storage module to the battery device is merely illustrative, and it is not excluded that the power storage module may also be equivalently connected to the battery device in other manners.

In an embodiment, referring to fig. 5, on the basis of the foregoing embodiment, the power storage module includes a unidirectional voltage transformation unit, a fourth switch module, and a battery, where an input end of the unidirectional voltage transformation unit is an input end of the power storage module, a charge-discharge end of the battery is electrically connected to an output end of the unidirectional voltage transformation unit and a first conducting end of the fourth switch module, and a second conducting end of the fourth switch module is an output end of the power storage module;

the fourth switch module comprises a unidirectional conduction device, and the conduction direction is from a first conduction end of the fourth switch module to a second conduction end of the fourth switch module.

In this embodiment, the fourth switch module includes a unidirectional conductive device, and the internal current flow can only flow from the first conductive terminal of the fourth switch module to the second conductive terminal of the fourth switch module; the current flow direction of the unidirectional voltage transformation unit is from the input end to the output end of the unidirectional voltage transformation unit. The input end of the unidirectional voltage transformation unit is used as the input end of the power storage module and is electrically connected with the second conducting end of the gating module; the output end of the unidirectional voltage transformation unit is electrically connected with the charge and discharge ends of the storage battery.

The unidirectional voltage transformation unit can be a DC/DC (direct current to direct current) voltage power transformation unit, and the unidirectional voltage transformation unit can be used for outputting the converted voltage to the storage battery after converting the received direct current voltage into rated charging voltage matched with the storage battery.

Optionally, the unidirectional voltage transformation unit may convert the received dc voltage into a rated charging voltage adapted to the storage battery according to preset working parameters; or, the control end of the unidirectional voltage transformation unit is electrically connected with the control output end (not shown in the figure) of the control unit and is controlled by the control unit, so that the control unit can set the working parameters of the unidirectional voltage transformation unit by outputting corresponding control signals to the unidirectional voltage transformation unit, and the unidirectional voltage transformation unit can convert the received direct current voltage into corresponding direct current voltage according to the charging requirement of the storage battery (namely, the control unit can allocate the voltage converted by the unidirectional voltage transformation unit according to the charging requirement).

Optionally, the unidirectional conducting device in the fourth switch module may be a diode or a MOS transistor. If the first switch module is a diode, the first conducting end of the fourth switch module is an anode of the diode, and the second conducting end of the fourth switch module is a cathode of the diode; if the first switch module is a PMOS tube, the first conducting end of the fourth switch module is a drain electrode of the PMOS tube, and the second conducting end of the fourth switch module is a source electrode of the PMOS tube; if the first switch module is an NMOS tube, the first conducting end of the fourth switch module is a source electrode of the NMOS tube, and the second conducting end of the fourth switch module is a drain electrode of the NMOS tube.

If the unidirectional conducting device in the fourth switch module is an MOS tube, the control output end of the control unit can be electrically connected with a grid electrode (not shown in the figure) of the MOS tube, and the corresponding control signal is output to the grid electrode of the MOS tube to control the MOS tube to be conducted or cut off, so that the fourth switch module is controlled to be turned on or off; if the fourth switch module is a diode, the fourth switch module can automatically realize the on or off of the fourth switch module by automatically detecting the voltage difference variation between the first conducting end and the second conducting end.

When the fourth switch module is closed, a passage can be formed between the first conducting end and the second conducting end of the fourth switch module; when the fourth switch module is disconnected, an open circuit is formed between the first conducting end and the second conducting end of the fourth switch module.

Optionally, since the first conducting end of the fourth switch module is electrically connected with the charge and discharge end of the storage battery, when the fourth switch module is turned on, a path is formed between the storage battery and the second conducting end of the fourth switch module, and the storage battery module has voltage output; otherwise, if the fourth switch module is disconnected, an open circuit is formed between the storage battery and the second conducting end of the fourth switch module, and the storage battery module does not have voltage output.

Optionally, when the direct current input end can supply power for a load connected with the battery device, the fourth switch module is disconnected, and the power storage module does not output; when the direct current input end cannot meet the power supply requirement of the load, the fourth switch module is conducted, and the power storage module can supply power to the load.

If the fourth switch module is a diode, when the power supply of the direct current input end is normal, the cathode voltage of the diode is enabled to be larger than the anode voltage, and then the fourth switch module is enabled to be disconnected; when the power supply of the direct current input end is abnormal, the cathode voltage of the diode is smaller than the anode voltage, and then the fourth switch module is closed. In this way, the fourth switch module can be automatically opened or closed.

By utilizing the device characteristics of the fourth switch module and the unidirectional voltage transformation unit, the charging and discharging control of the storage battery in the power storage module can be performed timely, for example, when no current is input to the direct current input end, the storage battery in any power storage module is controlled to discharge a load, or when the direct current input end has current input, and the storage battery is not fully charged, the unidirectional voltage transformation unit can be controlled to charge the storage battery by utilizing the current input by the direct current input end.

In an embodiment, on the basis of the above embodiment, only one general control unit may be provided in the battery device, and the control unit monitors and controls various circuits or components in the battery device and is responsible for management work of the battery device.

Or, the control unit arranged in the battery device may be composed of two control units, and is divided into a first control unit and a second control unit, where the first control unit is used to directly monitor and control the circuits (including monitoring and controlling the components in the circuits) except the power storage module in the battery device, and is directly responsible for the management work of the circuits (including managing the components in the circuits); the second control unit is responsible for monitoring and controlling the electric storage module (including monitoring and controlling components therein, such as monitoring the electric quantity of the storage battery, adjusting the working parameters of the unidirectional voltage transformation unit, etc.), and is responsible for the management work of the electric storage module (such as charge and discharge management of the electric storage module), meanwhile, the second control unit is in communication connection with the first control unit, and can report the monitoring data of the electric storage module (including the electric quantity of the storage battery, the current value of each place in the electric storage module, etc.) to the first control unit, and can execute corresponding control operation on the electric storage module based on the control instruction sent by the first control unit, i.e., the first control unit can monitor and control the electric storage module through the second control unit (which is equivalent to the first control unit being a master control unit in the battery device, and the second control unit being a slave control unit in the battery device), and is responsible for the management work of the electric storage module.

The second control unit may be a BMS (BATTERY MANAGEMENT SYSTEM ).

Referring to fig. 6, a power supply system further provided by the present utility model includes a dc source and a plurality of battery devices, and the specific structure of any one of the battery devices can refer to the above embodiments.

The direct current source can be used for accessing external energy (such as alternating current commercial power), and converts the external energy into direct current suitable for loads of the data center, and then outputs the direct current to each battery device.

Alternatively, the dc source may be provided with a plurality of dc outputs, each of which may be electrically connected to a dc input of a battery device.

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 battery device through each direct current output end. In addition, the power distribution control module can also protect overload, short circuit and electric leakage of the circuit.

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 (8)

1. The battery device is characterized by comprising a direct current input end, a control unit, a plurality of power storage modules, a first switch module, a second switch module and at least one third switch module, wherein the direct current input end is used for being connected with a direct current source, the first switch module and the second switch module are sequentially connected in series between the direct current input end and a first conducting end of the third switch module, a second conducting end of the third switch module is used for being connected with a load, an input end of each power storage module is connected to a passage between the first switch module and the second switch module, an output end of each power storage module is electrically connected with the first conducting end of the third switch module, and a communication end and/or a control output end of the control unit is electrically connected with the third switch module and the power storage module.

2. The battery device with multiple power storage modules connected in parallel according to claim 1, wherein the first switch module includes a unidirectional conduction device, and a conduction direction of the unidirectional conduction device is a direction from the direct current input terminal to the load;

the second switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

3. The multi-storage module parallel battery device according to claim 2, wherein the first switch module further includes a second normally-open switch connected in parallel with the unidirectional conduction device between the direct current input terminal and the second switch module.

4. The battery device with multiple power storage modules connected in parallel according to claim 1, wherein the second switch module includes a unidirectional conduction device, and a conduction direction of the unidirectional conduction device is a direction from the direct current input terminal to the load;

the first switch module is a first normally open switch, and the control output end of the control unit is also electrically connected with the control end of the first normally open switch.

5. The multi-storage module parallel battery device according to claim 4, wherein the second switch module further includes a second normally open switch connected in parallel with the unidirectional conductive device between the first switch module and the third switch module.

6. The multi-power storage module parallel battery device according to any one of claims 2 to 5, wherein the unidirectional-conduction device is a diode;

or, the unidirectional conduction device is a MOS tube, and the control output end of the control unit is also electrically connected with the control end of the MOS tube.

7. The battery device with multiple power storage modules connected in parallel according to claim 1, wherein the power storage modules are connected to the battery device in a detachable electrical connection manner.

8. A power supply system comprising a dc source and a plurality of battery devices, wherein the battery devices are the battery devices in parallel with the plurality of power storage modules according to any one of claims 1 to 7, and a dc output terminal of the dc source is electrically connected to a dc input terminal of each of the battery devices.