Energy storage device and power utilization device

Abstract

The embodiment of the utility model provides an energy storage device and a power utilization device, and the device comprises a plurality of battery devices, and the plurality of battery devices are configured to be connected in parallel when the energy storage device is in a non-charging state. And / or under the condition that the energy storage device is in the charging state, the plurality of battery devices are connected in series; wherein under the condition that the energy storage device is in the charging state, the energy storage device is connected with external charging equipment so as to provide electric energy for the external charging equipment or receive the electric energy of the external charging equipment. The safety performance of the energy storage device can be improved, and meanwhile the charging time of the energy storage device is shortened.

Description

Technical Field

[0001] This application relates to the field of energy storage, and more specifically, to an energy storage device and an electrical device. Background Technology

[0002] Against the backdrop of increased global support for the development of new energy technologies, various energy storage-related technologies have been widely applied. To meet the demands of large-capacity energy storage devices, the charging and discharging process of batteries needs to be managed. Therefore, how to effectively manage the charging and discharging process of batteries is an urgent problem to be solved. Utility Model Content

[0003] This application provides an energy storage device and an electrical device, which can improve the safety performance of the energy storage device while reducing the charging time of the energy storage device.

[0004] In a first aspect, this application provides an energy storage device, including a plurality of battery devices, which are configured to be connected in parallel when the energy storage device is in a non-charging state; and / or, to be connected in series when the energy storage device is in a charging state; wherein, when the energy storage device is in a charging state, the energy storage device is connected to an external charging device to provide electrical energy to the external charging device or to receive electrical energy from the external charging device.

[0005] In the technical solution of this application embodiment, by connecting multiple battery devices in parallel when the energy storage device is not charging, the voltage of the energy storage device can be reduced, thereby improving the safety performance of the energy storage device; by connecting multiple battery devices in series when the energy storage device is charging, the voltage of the battery devices during charging can be increased, thereby reducing the charging time of the energy storage device. Therefore, the connection switching of multiple battery devices in the charging and non-charging states of the energy storage device can improve the safety performance of the energy storage device while reducing the charging time of the energy storage device.

[0006] In some embodiments, the energy storage device further includes a control unit and a plurality of on / off devices. The control unit is connected to a plurality of battery devices and is used to control the opening and closing of the plurality of on / off devices so that the plurality of battery devices are connected in series or in parallel.

[0007] In the technical solution of this application embodiment, the control unit controls the opening and closing of multiple on / off devices to configure the energy storage device to a charging state or a non-charging state, that is, controls the series and parallel connection of multiple battery devices, which can improve the safety performance of the energy storage device while reducing the charging time of the energy storage device.

[0008] In some embodiments, the energy storage device further includes multiple first branches connected in parallel, and the switching device includes a first switching device and a second switching device. Each of the multiple first branches includes a first switching device, a second switching device and a battery device. The first switching device, the second switching device and the battery device are connected in series, and the first switching device is connected to the first terminal of the battery device, and the second switching device is connected to the second terminal of the battery device.

[0009] In some embodiments, the energy storage device further includes multiple second branches, and the switching device further includes a third switching device. The second branch includes the third switching device, and adjacent first branches among the multiple first branches are connected through the second branches. One side of the second branch is connected between the first switching device in one of the first branches and the first electrode of the battery device, and the other side is connected between the second switching device in another first branch and the second electrode of the battery device.

[0010] In the technical solution of this application embodiment, multiple first branches are connected in parallel, and a second branch is connected to two adjacent first branches. By opening and closing the first switching device on the first branch and the third switching device on the second branch, the series and parallel connection conversion between multiple battery devices can be realized, which can improve the safety performance of the energy storage device while reducing the charging time of the energy storage device.

[0011] In some embodiments, the energy storage device further includes a plurality of pre-charge circuits, at least one of which is connected in parallel in the first branch where the battery devices corresponding to the plurality of battery devices are located, and is located in a series circuit formed by the plurality of battery devices. The series circuit is a circuit formed by a plurality of partial first branches and a plurality of second branches when the energy storage device is configured to charge. The plurality of pre-charge circuits are used to regulate the charging and discharging current of the plurality of battery devices.

[0012] In the technical solution of this application embodiment, a pre-charge circuit is connected in parallel in the series circuit formed by multiple battery devices. By limiting the charging and discharging current of the battery devices, the switching device and the battery devices are protected, while the safety and reliability of the energy storage device are improved.

[0013] In some embodiments, the precharge circuit includes a precharge relay and a precharge resistor, which are connected in series.

[0014] In the technical solution of this application embodiment, a buffer stage is provided for the branch circuit by connecting the pre-charge relay and the pre-charge resistor in series in the pre-charge circuit, thereby improving the stability and safety of the energy storage device during the charging and discharging process.

[0015] In some embodiments, the energy storage device further includes a plurality of fuses connected in series in the first branch where the battery devices corresponding to the plurality of battery devices are located.

[0016] In the technical solution of this application embodiment, the stability and security of the first branch are improved by protecting the first branch through series connection in the first branch.

[0017] In some embodiments, the series voltage of the energy storage device is greater than or equal to 1500V, wherein the series voltage is the voltage of a plurality of battery devices when the energy storage device is configured to be in a charging state.

[0018] In the technical solution of this application embodiment, the series voltage of multiple battery devices connected in series is greater than or equal to 1500V. Under normal circumstances, when the energy storage device is charging or not charging, multiple battery devices are connected in series, and the voltage of the energy storage device is less than or equal to 1500V to reduce the safety problems of the energy storage device. In this application, multiple battery devices are connected in parallel when not charging, and the voltage of the energy storage device is less than or equal to 1500V. When charging, multiple battery devices are connected in series so that the series voltage is greater than or equal to 1500V. This can improve the safety performance of the energy storage device while reducing the charging time of the energy storage device.

[0019] In some embodiments, when the energy storage device is configured to be in a charging state, the series current of the multiple battery devices is less than or equal to 800A.

[0020] In the technical solution of this application embodiment, by setting the series current of multiple battery devices to less than or equal to 800A, the current of the charging gun connected to the energy storage device during the charging process can be less than or equal to 800A, so that the charging gun cable can be set to a small point for easy operation and the cable temperature can be reduced.

[0021] In some embodiments, the energy storage device has a charging rate greater than or equal to 6C.

[0022] In the technical solution of this application embodiment, by setting the charging rate of the energy storage device to be greater than or equal to 6C, the charging time of the energy storage device can be reduced, so as to enable the energy storage device to be charged more quickly.

[0023] In some embodiments, when the energy storage device is configured to be in a charging state, the energy storage device is connected to an external charging device via a charging gun.

[0024] In a second aspect, an electrical device is provided, including an energy storage device as described in the first aspect or any embodiment of the first aspect, the energy storage device being used to store or provide electrical energy. Attached Figure Description

[0025] Figure 1 A schematic diagram of a vehicle according to one embodiment of this application is shown.

[0026] Figure 2A partial structural schematic diagram of a battery device provided in an embodiment of this application is shown.

[0027] Figure 3 A schematic diagram of the structure of an energy storage device provided in an embodiment of this application is shown.

[0028] Figure 4 A schematic diagram of another energy storage device provided in an embodiment of this application is shown.

[0029] Figure 5 A schematic diagram of another energy storage device provided in an embodiment of this application is shown.

[0030] Figure 6 A schematic diagram of another energy storage device provided in an embodiment of this application is shown.

[0031] Figure 7 A schematic diagram of another energy storage device provided in an embodiment of this application is shown.

[0032] Reference numerals: Vehicle 1, Box 11, First Box Section 111, Second Box Section 112, Battery Cell 12, Controller 30, Motor 40, Energy Storage Device 100, Battery Device 110, Switching Device 120, First Switching Device 121, Second Switching Device 122, Third Switching Device 123, First Branch Circuit 130, Second Branch Circuit 140, Precharge Circuit 150, Precharge Relay 151, Precharge Resistor 152, Fuse 160, External Charging Equipment 180. Detailed Implementation

[0033] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0035] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0037] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0038] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0039] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0040] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0041] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0042] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0043] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0044] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0045] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0046] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0047] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0048] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0049] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0050] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0051] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0052] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0053] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0054] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0055] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0056] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0057] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0058] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0059] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0060] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0061] In some embodiments, the energy storage system may include one or more energy storage devices and a power conversion system (PCS), wherein the power conversion system is used to connect the power generation device and the energy storage device. The power generation device generates electrical energy, which can be stored in the energy storage device through the power conversion system. As examples, the power generation device may specifically be a solar panel, hydroelectric power generation device, thermal power generation device, wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0062] This application provides a charging network including a charging pile and an energy storage device. The charging pile is electrically connected to the energy storage device, which provides power to the charging pile. The charging pile is electrically connected to a battery device in the energy storage device via a cable, and the battery device can provide its stored electrical energy to the charging pile. The charging pile has one or more connectors for connecting to electrical equipment (such as a vehicle), thereby enabling the charging equipment to be recharged.

[0063] Currently, in the charging process of energy storage devices in various electrical devices, reducing the charging time of energy storage devices can improve user experience and reduce user waiting time. Taking vehicles as an example, users hope that the charging time of electric vehicles is the same as the refueling time of gasoline vehicles in order to reduce waiting time. However, under normal circumstances, the refueling time of gasoline vehicles is much shorter than the charging time of electric vehicles.

[0064] Generally, using batteries with higher charging rates allows them to accept more electricity in a shorter time. However, the charging rate of a battery is related to its electrode materials, electrolyte performance, and other properties, which means that the charging rate cannot be too high, thus affecting the charging time of the energy storage device.

[0065] To alleviate the problem of long charging times for energy storage devices, the charging power during the charging process can be increased, thereby reducing the charging time. However, excessive charging current during charging can cause the cables in the charging gun to overheat, leading to safety issues. Therefore, increasing the charging voltage during the charging process can reduce the charging time and achieve faster charging of electrical equipment. However, increasing the charging voltage, if the voltage of the energy storage device remains constant during charging and non-charging processes, can lead to leakage and other safety problems. Therefore, how to reduce the charging time of energy storage devices while simultaneously improving their safety performance is a problem worth considering.

[0066] Based on the above considerations, in order to address the problem of how to reduce the charging time of an energy storage device while improving its safety performance during charging, this application provides an energy storage device including multiple battery devices. These battery devices are configured to be connected in parallel when the energy storage device is not charging; and / or connected in series when the energy storage device is charging. In the charging state, the energy storage device is connected to an external charging device to provide or receive power from the external charging device. By connecting the multiple battery devices in parallel when the energy storage device is not charging, the voltage of the energy storage device can be reduced, thereby improving its safety performance. By connecting the multiple battery devices in series when the energy storage device is charging, the voltage of the battery devices during charging can be increased, thereby reducing the charging time. Therefore, the switching of the connection of the multiple battery devices between the charging and non-charging states of the energy storage device can improve its safety performance while reducing its charging time.

[0067] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0068] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0069] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0070] For example, such as Figure 1 As shown, Figure 1This illustration shows a structural diagram of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The interior of vehicle 1 can house a motor 40, a controller 30, and a battery device 110. The controller 30 controls the battery device 110 to supply power to the motor 40. For example, the battery device 110 can be located at the bottom, front, or rear of vehicle 1. The battery device 110 can be used to power vehicle 1; for example, it can serve as the operating power source for the vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 110 can not only serve as the operating power source for vehicle 1 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0071] For example. Figure 2 A partial structural schematic diagram of a battery device 110 provided in an embodiment of this application is shown. For example... Figure 2 As shown, the battery device 110 of this application embodiment may include a plurality of battery cells 12 to meet different power usage requirements. The shape of the battery cell 12 in this application embodiment can be set according to actual application. For example, the battery cell 12 can be as follows: Figure 2 The cylindrical shape shown, or it could be different. Figure 2 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0072] It should be understood that, such as Figure 2 As shown, the battery device 110 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 12. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 12 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 12 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 2As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 12. The multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0073] For example, unlike Figure 2 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening, and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 12.

[0074] Figure 3 A schematic diagram of the structure of an energy storage device 100 provided in an embodiment of this application is shown.

[0075] According to some embodiments of this application, refer to Figures 3 to 7 , Figure 4 This paper shows a schematic diagram of the structure of another energy storage device 100 provided in an embodiment of this application. Figure 5 This paper shows a schematic diagram of the structure of another energy storage device 100 provided in an embodiment of this application. Figure 6 This paper shows a schematic diagram of the structure of another energy storage device 100 provided in an embodiment of this application. Figure 7 A schematic diagram of another energy storage device 100 provided in an embodiment of this application is shown. This application provides an energy storage device 100, including a plurality of battery devices 110. The plurality of battery devices 110 are configured to be connected in parallel when the energy storage device 100 is in a non-charging state; and / or, to be connected in series when the energy storage device 100 is in a charging state; wherein, when the energy storage device 100 is in a charging state, the energy storage device 100 is connected to an external charging device to provide electrical energy to or receive electrical energy from the external charging device.

[0076] The multiple battery devices 110 may include one or more individual battery cells, and this application does not impose any limitations on this.

[0077] It should be understood that multiple battery devices 110 can also be described as having a series voltage of energy storage device 100 in the charging state and a parallel voltage of energy storage device 100 in the parallel state that is greater than or equal to 2.

[0078] Taking an electric vehicle as an example, the charging state of the energy storage device 100 in an electric vehicle refers to the electric vehicle being connected to a charging pile or charger via a charging plug, the Battery Management System (BMS) controlling the main charging relay to close, and multiple battery devices 110 in the energy storage device 100 beginning to receive charging at a higher current. Depending on the state of the battery devices 110 and the capacity of the charging facilities, the charging process may employ different charging modes, such as constant current charging (CC), constant voltage charging (CV), or a combination of constant current followed by constant voltage. During the charging process, the BMS monitors the charging state of the battery devices 110, including parameters such as charging percentage, current, and voltage, and informs the driver of the charging progress through the vehicle's display system. The charging process ends when the battery devices 110 reach the set charging level (e.g., 80% or 100%) or when the charging time reaches a preset value. This charging state can be understood as the energy storage device 100 receiving electrical energy from external charging equipment such as a charging pile or charger. In addition, the charging status can also refer to the electric vehicle connecting to external charging devices such as mobile phones and speakers via a charging plug, so as to charge the external charging devices such as mobile phones and speakers, that is, to provide power to the external charging devices such as mobile phones and speakers.

[0079] The non-charging state of the energy storage device 100 in an electric vehicle refers to the electric vehicle's charging plug being disconnected from external charging equipment such as a charging station or charger, or it can be described as the electric vehicle being in a driving or parked state. Alternatively, the non-charging state can be defined as the electric vehicle's charging plug being disconnected from external charging devices such as mobile phones, stereos, etc.

[0080] In the embodiments of this application, the switching between parallel and series connection of multiple battery devices 110 in the charging and non-charging states of the energy storage device 100 can be achieved by relays, transistors, programmable logic controllers and various switches, and this application does not impose any restrictions on this.

[0081] Optionally, in the embodiments of this application, when the energy storage device 100 is in a charging state, some of the battery devices 110 can be connected in parallel and some can be connected in series. When the energy storage device 100 is not in a charging state, some of the battery devices 110 can be connected in parallel and some can be connected in series. Unlike the charging state, the number of battery devices 110 connected in parallel in the non-charging state can be greater than the number of battery devices 110 connected in series.

[0082] In this embodiment, by connecting multiple battery devices 110 in parallel when the energy storage device 100 is not charging, the overall voltage of the energy storage device 100 can be reduced, thereby improving the safety performance of the energy storage device 100. Furthermore, typically, the multiple battery devices 110 in the energy storage device 100 are connected in the same way, such as in series, whether in the charging or non-charging state. Taking an electric vehicle as an example, when the electric vehicle is not charging, the overall voltage of the energy storage device 100 must not be too high, as this can easily lead to safety problems such as leakage. However, a higher overall voltage of the energy storage device 100 during the charging state can reduce the charging time. Therefore, by connecting multiple battery devices 110 in series during the charging state of the energy storage device 100, the voltage of the battery devices 110 during charging can be increased, thereby reducing the charging time of the energy storage device 100. Simultaneously, the connection switching of the multiple battery devices 110 between the charging and non-charging states of the energy storage device 100 can improve the safety performance of the energy storage device 100 while simultaneously reducing its charging time.

[0083] The charging time of the energy storage device 100 can be determined based on the charging rate, which is the rate at which the battery device 110 can charge or discharge per unit time. This rate is related to the performance of the battery device 110 itself, such as the electrode materials and electrolyte performance. Typically, due to limitations in the performance of the battery device 110, the charging rate is generally between 0.1C and 4C. Alternatively, the charging time can also be determined based on the total capacity and charging power of the energy storage device 100, using the following formula:

[0084]

[0085] Where Q is the total capacity of the energy storage device 100, P is the charging power of the energy storage device 100, U is the charging voltage of the energy storage device 100, and I is the charging current of the energy storage device 100. From the above formula, it can be seen that increasing the charging voltage can reduce the charging time of the energy storage device 100.

[0086] According to some embodiments of this application, the energy storage device 100 may optionally include a control unit and a plurality of on / off devices 120. The control unit is used to control the opening and closing of the plurality of on / off devices 120 to control the series or parallel connection of the plurality of battery devices 110.

[0087] The control unit can be a BMS. The control unit controls the connection method of multiple battery devices 110 to configure the energy storage device 100 to a charging state or a non-charging state. For example, the control unit controls the multiple battery devices 110 to be connected in series, and the energy storage device 100 is configured to be in a charging state. The control unit controls the multiple battery devices 110 to be connected in parallel, and the energy storage device 100 is configured to be in a non-charging state.

[0088] In this embodiment, the energy storage device 100 is configured to be in a charging state or a non-charging state by the control unit, that is, the multiple battery devices 110 are controlled to switch between series and parallel connection, which can improve the safety performance of the energy storage device 100 while reducing the charging time of the energy storage device 100.

[0089] It should be understood that the switching device 120 can be a relay, transistor, programmable logic controller, and various switches, etc., and this application does not impose any restrictions on it.

[0090] In this embodiment of the application, by opening and closing the switching device 120, the series and parallel connection of multiple battery devices 110 can be flexibly adjusted, so as to improve the safety performance of the energy storage device 100 while reducing the charging time of the energy storage device 100.

[0091] Optionally, reference may continue to be made to some embodiments of this application. Figures 4 to 6 The energy storage device 100 also includes multiple first branches 130 connected in parallel. The switching device 120 includes a first switching device 121 and a second switching device 122. Each of the multiple first branches 130 includes a first switching device 121, a second switching device 122 and a battery device 110. The first switching device 121, the second switching device 122 and the battery device 110 are connected in series. The first switching device 121 is connected to the first terminal of the battery device 110 and the second switching device 122 is connected to the second terminal of the battery device 110.

[0092] by Figure 4 For example, the diagram includes three first branches 130, which are connected in parallel. The first switching device 121, the second switching device 122, and the battery device 110 are connected in series. The first switching device 121 is connected to the first terminal of the battery device 110, and the second switching device 122 is connected to the second terminal of the battery device 110. Figure 4 The first electrode is the negative electrode and the second electrode is the positive electrode. It should be understood that the first electrode can also be the positive electrode and the second electrode can be the negative electrode. This application does not limit this in any way.

[0093] Optionally, reference may continue to be made to some embodiments of this application. Figures 4 to 7The energy storage device 100 also includes multiple second branches 140, and the switching device 120 also includes a third switching device 123. The second branch 140 includes the third switching device 123. Adjacent first branches 130 among the multiple first branches 130 are connected through the second branch 140. One side of the second branch 140 is connected between the first switching device 121 in one of the first branches 130 and the first electrode of the battery device 110, and the other side is connected between the second switching device 122 in another first branch 130 and the second electrode of the battery device 110.

[0094] Among them, such as Figure 4 As shown, when the energy storage device 100 is configured in a charging state, the first switching device 121 in the last first branch 130 of the plurality of first branches 130 is in a closed state, the first switching device 121 in the remaining first branches 130 (excluding the first branch 130) of the plurality of first branches 130 is in an open state, the second switching device 122 in the first branch 130 of the plurality of first branches 130 is in a closed state, and the remaining first branches 130 (excluding the first branch 130) of the plurality of first branches 130 are in an open state. The second switching device 122 in the first branch 130 is in the open state, and the third switching device 123 in the second branch 140 is in the closed state. Therefore, the multiple battery devices 110 in the energy storage device 100 are connected in series. When the energy storage device 100 is configured to a non-charging state, the first switching devices 121 and the second switching devices 122 in all the first branches 130 are in the closed state, and the third switching device 123 in the second branch 140 is in the open state. Therefore, the multiple battery devices in the energy storage device 100 are connected in parallel.

[0095] Optional, such as Figure 5As shown, the number of first branches 130 may not be the same as the number of first switching devices 121 and second switching devices 122. Alternatively, the number of first branches 130 may be greater than the number of first switching devices 121 or second switching devices 122. That is, not every first branch 130 includes both first switching devices 121 and second switching devices 122. Specifically, for the first and last first branches 130 among multiple first branches 130, the first first branch 130 may only include the first switching device 121 and the battery device 110, excluding the second switching device 122, and the last first branch 130 may only include the second switching device 122 and the battery device 110, excluding the first switching device 121. When the energy storage device 100 is configured for charging, the first switching devices 121 of the multiple first branches 130 are in the open state, the second switching devices 122 of the multiple first branches 130 are in the open state, and the third switching device 123 of the second branch 140 is in the closed state. Therefore, the multiple battery devices 110 in the energy storage device 100 are connected in series. When the energy storage device 100 is configured for non-charging, the first switching devices 121 and second switching devices 122 of all the first branches 130 are in the closed state, and the third switching device 123 of the second branch 140 is in the open state. Therefore, the multiple battery devices in the energy storage device 100 are connected in parallel. This design simplifies the circuit design of the energy storage device 100.

[0096] In this embodiment, multiple first branches 130 are connected in parallel, and a second branch 140 is connected to two adjacent first branches 130. By opening and closing the first switching device 121 on the first branch 130 and the third switching device 123 on the second branch 140, the series and parallel connection conversion between multiple battery devices 110 can be realized, which can improve the safety performance of the energy storage device 100 while reducing the charging time of the energy storage device 100.

[0097] Optionally, based on some embodiments of this application, reference may be made to... Figure 6 and Figure 7 The energy storage device 100 also includes a plurality of pre-charge circuits 150. At least one of the plurality of pre-charge circuits 150 is connected in parallel in the first branch where the battery devices 110 are located, and is located in the series circuit formed by the plurality of battery devices 110. The series circuit is a circuit formed by a plurality of partial first branches 130 and a plurality of second branches 140 when the energy storage device 100 is configured to charge. The plurality of pre-charge circuits 150 are used to regulate the charging and discharging current of the plurality of battery devices 110.

[0098] It should be understood that, such as Figure 6As shown, the first branch 130 in the series circuit is a portion of the battery device 110, starting from the intersection of the first branch 130 and the second branch 140.

[0099] like Figure 6 As shown, when the pre-charge circuit 150 is connected in parallel with the second switching device 122, the second switching device 122 is open during the pre-charge process. After the pre-charge is completed, the second switching device 122 is closed to charge and discharge the battery device 110.

[0100] At least one of the multiple precharge circuits 150 is connected in parallel in the series circuit formed by the multiple battery devices 110. This can be understood as one of the multiple precharge circuits 150 being connected in parallel to the second switching device 122 in the first branch 130. Although the other precharge circuits 150 are also connected in parallel to the second switching device 122 in the corresponding first branch 130, when the multiple battery devices 110 are connected in series, except for the precharge circuit 150 in the first branch 130 which is in the series circuit, the other precharge circuits 150 are not in the series circuit. That is, the energy storage device 100 is precharged only through the precharge circuit 150 on the first branch 130.

[0101] Optional, you can refer to Figure 6 and Figure 7 Taking the pre-charge circuit 150 connected in parallel to the second switching device 122 as an example, when the energy storage device 100 is configured to charge, and multiple battery devices 110 are connected in series, the series circuit includes the pre-charge circuit 150 in the first branch 130, while other pre-charge circuits 150 are not connected in the series circuit. When the energy storage device 100 is configured to non-charge, and multiple battery devices 110 are connected in parallel, each first branch 130 includes a pre-charge circuit, and the pre-charge process is performed separately.

[0102] It should be understood that the precharge circuit 150 can also be connected in parallel to the battery device 110 or the third switching device 123, and this application does not limit it in any way.

[0103] It should also be understood that Figure 6 Only two first branches 130 are shown in the illustration. In this embodiment, the number of first branches 130 is not limited.

[0104] In this embodiment of the application, a pre-charge circuit 150 is connected in parallel in the first branch 130. By limiting the charging and discharging current in the first branch 130, the battery device 110 is protected while the safety and reliability of the energy storage device 100 are improved.

[0105] Optionally, reference may continue to be made to some embodiments of this application. Figure 6and Figure 7 The precharge circuit 150 includes a precharge relay 151 and a precharge resistor 152, which are connected in series.

[0106] In this embodiment, the pre-charge relay 151 and pre-charge resistor 152 in the pre-charge circuit 150 are connected in series to provide a buffer stage for the branch, thereby improving the stability and safety of the energy storage device 100 during the charging and discharging process.

[0107] Optionally, reference may continue to be made to some embodiments of this application. Figure 6 and Figure 7 The energy storage device 100 also includes multiple fuses 160, which are connected in series in the first branch where the battery devices 110 are located.

[0108] Optionally, multiple fuses 160 can be connected in series in the first branch where the multiple battery devices 110 are located, and are located in a series circuit. The multiple fuses 160 are used to protect the multiple battery devices 110. Connecting the fuses 160 in series in the series circuit ensures that the fuses 160 can protect the battery devices 110 whether they are connected in series or in parallel. The fuses 160 can be fusible links.

[0109] Optionally, the fuse 160 is connected in series with the first branch 130 in the series circuit, so that each first branch 130 is protected by the fuse 160 regardless of whether the battery device 110 is connected in series or in parallel.

[0110] Optional, such as Figure 5 He Ru Figure 6 As shown, each of the multiple fuses 160 can be connected in series between the battery device 110 and the second switching device 122. More specifically, taking three first branches 130 as an example, in the first first branch 130, the fuse 160 can be connected in series between the battery device 110 and the second switching device 122. In the second and third first branches 130, the fuse 160 can be connected in series between the positive terminal of the battery device 110 and the intersection of the first branch 130 and the second branch 140 near the second switching device 122, so that regardless of whether the battery device 110 is connected in series or in parallel, each first branch 130 is protected by a fuse 160.

[0111] It should be understood that the fuse 160 can also be connected in series in the second branch 140 to protect the battery device 110 during the series connection process.

[0112] In this embodiment of the application, the first branch 130 is protected by connecting a fuse 160 in series in the first branch 130, thereby improving the stability and safety of the first branch 130.

[0113] Optionally, reference may continue to be made to some embodiments of this application. Figures 4 to 6 The series voltage of the energy storage device 100 is greater than or equal to 1500V, wherein the series voltage is the voltage of the plurality of battery devices 110 when the energy storage device 100 is configured to charge.

[0114] In this embodiment, the series voltage of multiple battery devices 110 connected in series is greater than or equal to 1500V. Under normal circumstances, when the energy storage device 100 is charging or not charging, multiple battery devices 110 are connected in series, and the voltage of the energy storage device 100 is required to be less than or equal to 1500V to reduce the safety problems of the energy storage device 100. In this application, multiple battery devices 110 are connected in parallel when not charging, and the voltage of the energy storage device 100 is less than or equal to 1500V. When charging, multiple battery devices 110 are connected in series to make the series voltage greater than or equal to 1500V, which can improve the safety performance of the energy storage device 100 while reducing the charging time of the energy storage device 100.

[0115] Optionally, reference may continue to be made to some embodiments of this application. Figures 4 to 6 When the energy storage device 100 is configured to charge, the series current of the multiple battery devices 110 is less than or equal to 800A.

[0116] In this embodiment of the application, by setting the series current of the multiple battery devices 110 to less than or equal to 800A, the current of the charging gun connected to the energy storage device 100 during the charging process can be less than or equal to 800A, so that the charging gun cable can be set a little lower for easy operation and the cable temperature can be reduced.

[0117] Optionally, reference may continue to be made to some embodiments of this application. Figures 3 to 6 The charging rate of the energy storage device 100 is greater than or equal to 6C.

[0118] In this embodiment of the application, by setting the charging rate of the energy storage device 100 to be greater than or equal to 6C, for example, the charging rate of the energy storage device 100 can be 6C, 7C, etc., a larger charging rate can reduce the charging time of the energy storage device 100, so as to enable the energy storage device 100 to charge faster.

[0119] Optionally, an example can be given based on an embodiment of this application. For instance, the total capacity Q of the energy storage device 100 of an electric vehicle is 100kWh. The energy storage device 100 consists of three battery devices 110. In the non-charging state, the parallel voltage U2 of the energy storage device 100 is 800V, the capacity of a single battery is 41.7Ah, and the charging current is 800A. Then, in the charging state, the series voltage is 800V×3=2400V. After the energy storage device 100 is fully charged, the charging time calculated according to the formula above is 3.125min, which can realize the fast charging process.

[0120] It should be understood that the charging process parameters of battery device 110 can be the State of Charge (SOC). SOC measures the percentage of the remaining capacity of battery device 110 relative to its full charge capacity, and is usually expressed as a percentage (%). For example, if the SOC of battery device 110 is 75%, it means that battery device 110 has 75% of its charge remaining, and 25% of its charge has been used. In the above embodiment, full charge refers to an SOC of 100%.

[0121] Optionally, reference may continue to be made to some embodiments of this application. Figure 7 When the energy storage device 100 is configured for charging, the energy storage device 100 is connected to the external charging device 180 via a charging gun. The external charging device 180 can be a charging pile.

[0122] According to some embodiments of this application, this application also provides an electrical device, including an energy storage device according to any of the above embodiments, the energy storage device being used to store or provide electrical energy.

[0123] According to some embodiments of this application, see Figures 3 to 7 This application provides an energy storage device 100, including a plurality of battery devices 110. The battery devices 110 are configured to be connected in parallel when the energy storage device 100 is in a non-charging state; and / or, to be connected in series when the energy storage device 100 is in a charging state. When the energy storage device 100 is in a charging state, it is connected to an external charging device to provide power to or receive power from the external charging device. This can improve the safety performance of the energy storage device 100 while reducing its charging time.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized by, The energy storage device comprises: a plurality of battery devices configured to be connected in parallel when the energy storage device is in a non-charging state; and / or, the plurality of battery devices are connected in series when the energy storage device is in a charging state; wherein, when the energy storage device is in a charging state, the energy storage device is connected to an external charging device to provide or receive electrical energy from the external charging device.

2. The energy storage device of claim 1, wherein, The energy storage device further comprises a control unit and a plurality of on-off devices, the control unit being connected to the plurality of battery devices, the control unit is configured to control the opening and closing of the plurality of on-off devices to connect the plurality of battery devices in series or in parallel.

3. The energy storage device of claim 2, wherein, The energy storage device further comprises a plurality of first branches, the plurality of first branches being connected in parallel, and the on-off device comprises a first on-off device and a second on-off device, each of the plurality of first branches comprises the first on-off device, the second on-off device and the battery device, the first on-off device, the second on-off device and the battery device being connected in series, and the first on-off device being connected to the first pole of the battery device, and the second on-off device being connected to the second pole of the battery device.

4. The energy storage device of claim 3, wherein, The energy storage device further comprises a plurality of second branches, and the on-off device further comprises a third on-off device, and the second branch comprises the third on-off device, adjacent first branches in the plurality of first branches are connected through the second branch, and one side of the second branch is connected between the first on-off device and the first pole of the battery device in one of the first branches, and the other side of the second branch is connected between the second on-off device and the second pole of the battery device in another of the first branches.

5. The energy storage device of claim 4, wherein, The energy storage device further comprises a plurality of pre-charge circuits, at least one of the plurality of pre-charge circuits is connected in parallel in the first branch in which the corresponding battery device of the plurality of battery devices is located, and is located in a series loop formed by the plurality of battery devices, the series loop being a loop formed by a plurality of partial first branches and a plurality of second branches when the energy storage device is configured in a charging state, the plurality of pre-charge circuits are configured to adjust the charge and discharge current of the plurality of battery devices.

6. The energy storage device of claim 5, wherein, The pre-charge circuit comprises a pre-charge relay and a pre-charge resistor, and the pre-charge relay and the pre-charge resistor are connected in series.

7. The energy storage device of claim 5, wherein, The energy storage device further comprises a plurality of fuses, and the plurality of fuses are connected in series in the first branch in which the corresponding battery device of the plurality of battery devices is located.

8. The energy storage device of any one of claims 1-7, wherein, The series voltage of the energy storage device is greater than or equal to 1500V, wherein the series voltage is the voltage of the plurality of battery devices when the energy storage device is configured in a charging state.

9. The energy storage device of any one of claims 1-7, wherein, The series current of the plurality of battery devices when the energy storage device is configured in a charging state is less than or equal to 800A.

10. The energy storage device of any one of claims 1-7, wherein, The charge rate of the energy storage device is greater than or equal to 6C.

11. The energy storage device of any one of claims 1-7, wherein, When the energy storage device is configured in a charging state, the energy storage device is connected to the external charging device through a charging gun.

12. An electrical device, comprising: An energy storage device according to any one of 1 to 11 for storing or providing electrical energy.

Images