Charging system

Abstract

The embodiment of the present application provides a storage and charging system, which comprises a first energy storage device and a charging device, and the first energy storage device comprises: at least one cascade utilization battery pack, the cascade utilization battery pack comprises a plurality of cascade utilization battery monomers, and the inconsistency of initial capacities of the plurality of cascade utilization battery monomers is less than or equal to 10%; and at least one power module, one end of the at least one power module is connected to the at least one cascade utilization battery pack, and the other end of the at least one power module is connected to the charging device. The embodiment of the present application provides a storage and charging system, which can realize reasonable utilization of cascade utilization batteries, thereby reducing the influence of direct retirement of cascade utilization power batteries on the environment and reducing the waste of resources, and meanwhile, the use performance of the cascade utilization batteries can be improved.

Description

Technical Field

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

[0002] Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] Among these developments, power batteries will enter a large-scale retirement period. Retired power batteries typically have a capacity reduction to 70%–80% of their initial capacity, still possessing a significant amount of remaining energy. If these retired power batteries are rationally reused, their environmental impact can be reduced, and resource waste can be minimized.

[0004] How to make reasonable use of retired power batteries has become one of the urgent problems to be solved. Utility Model Content

[0005] This application provides a storage and charging system that enables the rational use of cascaded batteries, thereby reducing the environmental impact of directly retiring cascaded power batteries and reducing resource waste, while also improving the performance of cascaded batteries.

[0006] In a first aspect, a storage and charging system is provided, the storage and charging system including a first energy storage device and a charging device, the first energy storage device including: at least one secondary battery pack, the secondary battery pack including a plurality of secondary battery cells, the inconsistency of the initial capacity of the plurality of secondary battery cells being less than or equal to 10%; at least one power module, one end of the at least one power module being connected to the at least one secondary battery pack, and the other end of the at least one power module being connected to the charging device.

[0007] In the embodiments of this application, the first energy storage device in the energy storage and charging system may include at least one secondary battery pack, and the initial capacity deviation of multiple secondary battery cells in each secondary battery pack is less than or equal to 10%, which can realize the rational utilization of secondary batteries, thereby reducing the environmental impact of direct retirement of secondary power batteries and reducing resource waste, while improving the performance of secondary batteries.

[0008] In one possible implementation, the absolute value of the difference in the initial SOC of the plurality of cascaded battery cells is less than or equal to 10%.

[0009] In this embodiment of the application, the first energy storage device in the energy storage and charging system provided in this embodiment may include at least one secondary battery pack. The initial capacity inconsistency of multiple secondary battery cells in each secondary battery pack is less than or equal to 10%, and the absolute value of the difference in the initial state of charge (SOC) of the multiple secondary battery cells is less than or equal to 10%. Thus, before the secondary battery pack is put into use, no additional charging and discharging is required to reduce the SOC difference between the multiple secondary battery cells, simplifying the process of putting the secondary battery pack into use. Furthermore, after the secondary battery pack is put into use, the balancing function of the energy storage device (if such a balancing function exists) can be used to balance the battery cells, further improving the consistency of the secondary battery cells.

[0010] In one possible implementation, the at least one secondary utilization battery pack includes a first secondary utilization battery pack, which includes a plurality of secondary utilization battery cells connected in series.

[0011] In the embodiments of this application, the secondary battery cells in the first secondary battery pack are connected in series, making the grouping simple, convenient and quick.

[0012] In one possible implementation, the at least one secondary utilization battery pack includes a second secondary utilization battery pack, the second secondary utilization battery pack including a plurality of first sub-secondary utilization battery packs connected in parallel, and the first sub-secondary utilization battery packs including a plurality of secondary utilization battery cells connected in series.

[0013] In this embodiment of the application, the second-stage battery is provided with multiple first-stage battery packs connected in parallel, and the first-stage battery packs include multiple battery cells connected in series, which can improve the power and capacity of the second-stage battery pack, thereby improving the power and capacity of the storage and charging system.

[0014] In one possible implementation, the at least one secondary battery pack includes a third secondary battery pack, the third secondary battery pack including a plurality of second sub-secondary battery packs connected in series, the second sub-secondary battery packs including a plurality of first branches connected in parallel, the first branch including one or a plurality of secondary battery cells connected in series.

[0015] In the embodiments of this application, the third-stage battery pack is provided with multiple second-stage battery packs connected in series. The second-stage battery packs include multiple first branches connected in parallel, and each first branch includes one or more battery cells connected in series. This can improve battery capacity and simplify structural design.

[0016] In one possible implementation, the at least one secondary utilization battery pack includes a fourth secondary utilization battery pack, the fourth secondary utilization battery pack includes a plurality of third sub-secondary utilization battery packs connected in parallel, the third sub-secondary utilization battery packs include a plurality of fourth sub-secondary utilization battery packs connected in series, the fourth sub-secondary utilization battery packs include a plurality of second branches connected in parallel, the second branches including one or a plurality of secondary utilization battery cells connected in series.

[0017] In this embodiment, the fourth-stage battery pack is provided with multiple third-stage battery packs connected in parallel, which can increase the battery capacity, reduce the number of output terminals of the total positive and negative electrodes of the fourth-stage battery pack, and simplify the structural design.

[0018] In one possible implementation, the other end of the power module is connected to the bus, and the charging device and the power grid are connected to the bus.

[0019] In this embodiment, each cascaded battery pack is connected to a power module. The other end of the power module is connected to a bus, enabling energy transfer between the first energy storage device, the charging device, and the power grid. For example, the first energy storage device can transfer energy to the charging device via the bus, the first energy storage device can draw power from the grid via the bus, and the grid can also transfer energy to the charging device via the bus.

[0020] In one possible implementation, there are multiple secondary battery packs and multiple power modules, with the other ends of the multiple power modules connected in parallel to the busbar.

[0021] In one possible implementation, a switch module is connected between the other end of the at least one power module and the bus.

[0022] In this embodiment, a switch module is installed between the node formed by the parallel connection of the other ends of multiple power modules and the busbar to facilitate the control of energy transmission between the first energy storage device, the charging device, and the power grid. The switch module can be closed when the first energy storage device needs to operate, and opened when it is not required to operate.

[0023] In one possible implementation, the energy storage and charging system further includes: a first control module, which is communicatively connected to the first energy storage device and the charging device, and is used to control the energy transmission of the first energy storage device and / or the charging device.

[0024] In this embodiment, the first control module is communicatively connected to the first energy storage device and the charging device. When the charging device needs to charge electrical equipment such as an electric vehicle, the first control module can control the first energy storage device to transmit electrical energy to the charging device to charge the electrical equipment.

[0025] In one possible implementation, the energy storage and charging system further includes a second energy storage device connected to the charging device, the second energy storage device including at least one non-cascaded battery pack.

[0026] In this embodiment of the application, by modifying the energy storage and charging system including the second energy storage device, a first energy storage device including a cascaded battery pack can be expanded, which can realize the rational utilization of retired batteries, thereby reducing the environmental impact of direct retirement of cascaded power batteries and reducing resource waste.

[0027] In one possible implementation, the energy storage and charging system further includes a second control module, which is communicatively connected to the second energy storage device and the charging device, and is used to control the energy transmission of the second energy storage device and / or the charging device.

[0028] In this embodiment, the energy transmission of the first energy storage device and / or charging device is controlled by the first control module, and the energy transmission of the second energy storage device and / or charging device is controlled by the second control module, which facilitates the energy transmission of the first energy storage device and the second energy storage device.

[0029] In one possible implementation, the first control module is communicatively connected to the second control module.

[0030] In this embodiment, by setting a first control module and a second control module that can be communicatively connected, the charging and discharging control between the first energy storage device, the second energy storage device, the charging device, and the power grid can be realized without disconnecting the connection between the first energy storage device and the charging device and the power grid (e.g., without disconnecting the switch module between the first energy storage device and the busbar) and without disconnecting the connection between the second energy storage device and the charging device and the power grid (e.g., without disconnecting another switch module between the second energy storage device and the busbar). Attached Figure Description

[0031] Figure 1 This is a schematic block diagram of a storage and charging system provided in an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the connection relationship of the first-stage battery pack provided in the embodiments of this application.

[0033] Figure 3This is a schematic diagram of the connection relationship of the second-stage battery pack provided in an embodiment of this application.

[0034] Figure 4 This is a schematic diagram of the connection relationship of the third-stage battery pack provided in the embodiments of this application.

[0035] Figure 5 Another schematic diagram showing the connection relationship of the third-stage battery pack provided in the embodiments of this application.

[0036] Figure 6 This is a schematic diagram of the connection relationship of the fourth-stage battery pack provided in the embodiments of this application.

[0037] Figure 7 Another schematic diagram showing the connection relationship of the fourth-stage battery pack provided in the embodiments of this application.

[0038] Figure 8 This is a schematic diagram of the connection relationship of the storage and charging system provided in the embodiments of this application.

[0039] Figure label:

[0040] Energy storage and charging system: 10, first energy storage device: 11, at least one secondary battery pack: 110, secondary battery cell: 1100, power module: 115, charging device: 12, first secondary battery pack: 111, second secondary battery pack: 112, third secondary battery pack: 113, fourth secondary battery pack: 114, first sub-secondary battery pack: 1121, second sub-secondary battery pack: 1131, third sub-secondary battery pack: 1141, fourth sub-secondary battery pack: 1142, first branch: 11311, second branch: 11421, bus: 20, power grid: 30, switch module: 13, first control module: 14, second energy storage device: 15, second control module: 16. Detailed Implementation

[0041] 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.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0043] The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In this application, the terms "upper," "lower," "left," "right," "inner," and "outer," indicating orientation or positional relationships, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0046] 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.

[0047] Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0048] Among these, power batteries will enter a large-scale retirement period. The capacity of retired power batteries typically decreases to 70%–80% of their initial capacity, still possessing a significant amount of remaining energy. If these retired power batteries are rationally reused, their environmental impact can be reduced, resource waste can be minimized, and their performance can be improved.

[0049] How to make reasonable use of retired power batteries has become one of the urgent problems to be solved.

[0050] Based on the above problems, this application provides a storage and charging system, which includes a first energy storage device and a charging device. The first energy storage device includes: at least one secondary battery pack 110, which includes a plurality of secondary battery cells, wherein the initial capacity inconsistency of the plurality of secondary battery cells is less than or equal to 10%; and at least one power module, one end of which is connected to the at least one secondary battery pack 110 and the other end of which is connected to the charging device.

[0051] The first energy storage device in the energy storage and charging system provided in this application embodiment may include at least one secondary battery pack 110, and the initial capacity inconsistency of multiple secondary battery cells in each secondary battery pack is less than or equal to 10%, which can realize the rational utilization of secondary batteries, thereby reducing the environmental impact of direct retirement of secondary power batteries and reducing resource waste, while improving the performance of secondary batteries.

[0052] The following combination Figures 1 to 8 The storage and charging system 10 provided in the embodiments of this application will be described by way of example.

[0053] Figure 1 This is a schematic block diagram of the storage and charging system 10 provided in an embodiment of this application.

[0054] The energy storage and charging system 10 includes a first energy storage device 11 and a charging device 12. The first energy storage device 11 includes at least one secondary battery pack 110 and at least one power module 115.

[0055] The secondary battery pack includes multiple secondary battery cells 1100, wherein the initial capacity inconsistency of the multiple secondary battery cells 1100 is less than or equal to 10%.

[0056] One end of at least one power module 115 is connected to at least one secondary battery pack 110, and the other end of at least one power module 115 is connected to a charging device 12.

[0057] In this application, the term "second-use battery cell 1100" refers to a retired battery cell, such as a power battery cell, that will be reused.

[0058] As an example, the energy storage device can store electrical energy and discharge it to a load such as an electric vehicle via the charging device 12.

[0059] As an example, charging device 12 may include a charging station.

[0060] As an example, the first energy storage device 11 may include multiple secondary battery packs and multiple power modules 115, with one end of each power module 115 connected to a multiple secondary battery pack and the other end of each power module 115 connected to a charging device 12.

[0061] As an example, each cascade battery pack 110 and its connected power module 115 can be set up individually or integrated.

[0062] In this application, each secondary battery pack may include a plurality of secondary battery cells 1100, and the inconsistency of the initial capacity among the plurality of secondary battery cells 1100 in each secondary battery pack is less than or equal to 10%.

[0063] The initial capacity among multiple secondary battery cells 1100 in each secondary battery pack refers to the capacity deviation among multiple secondary battery cells 1100 in the secondary battery pack before it is put into use. This initial capacity inconsistency is mainly used to measure the degree of consistency of the initial capacity of multiple secondary battery cells 1100 in each secondary battery pack.

[0064] As an example, the initial capacity inconsistency among multiple secondary battery cells 1100 can be calculated using the formula: a = (C1 - C2) / C2, where a is the initial capacity inconsistency among multiple secondary battery cells 1100, C1 is the maximum initial capacity among multiple secondary battery cells 1100, and C2 is the minimum initial capacity among multiple secondary battery cells 1100.

[0065] As another example, the initial capacity inconsistency among multiple secondary battery cells 1100 can be calculated using a = (C1 - C2) / C, where a is the initial capacity inconsistency among multiple secondary battery cells 1100, C1 is the maximum initial capacity among multiple secondary battery cells 1100, C2 is the minimum initial capacity among multiple secondary battery cells 1100, and C is the average initial capacity among multiple secondary battery cells 1100.

[0066] As another example, the initial capacity inconsistency among multiple secondary battery cells 1100 can be calculated using a = (C1-C2) / C1, where a is the initial capacity inconsistency among multiple secondary battery cells 1100, C1 is the maximum initial capacity among multiple secondary battery cells 1100, and C2 is the minimum initial capacity among multiple secondary battery cells 1100.

[0067] As an example, power module 115 may include a direct current to direct current (DC / DC) converter or a direct current to direct current (DC / AC) converter.

[0068] In this embodiment of the application, the first energy storage device 11 in the energy storage and charging system 10 may include at least one secondary battery pack 110, and the initial capacity deviation of the multiple secondary battery cells 1100 in each secondary battery pack is less than or equal to 10%, which can realize the rational use of secondary batteries, thereby reducing the environmental impact of direct retirement of secondary power batteries and reducing resource waste, while improving the performance of secondary batteries.

[0069] In some embodiments, the initial capacity inconsistency of the plurality of secondary-use battery cells 1100 is less than or equal to 5%.

[0070] In some embodiments, the absolute value of the difference in the initial SOC of the plurality of cascaded battery cells 1100 is less than or equal to 10%.

[0071] The absolute value of the difference in initial SOC between multiple cascaded battery cells 1100 in each cascaded battery pack is less than or equal to 10%.

[0072] As an example, the absolute value of the difference in initial SOC among multiple secondary battery cells 1100 can be calculated using the formula b = |S1 - S2|, where S1 is the maximum initial SOC among the multiple secondary battery cells 1100 and S2 is the minimum initial SOC among the multiple secondary battery cells 1100.

[0073] In this embodiment of the application, the first energy storage device 11 in the energy storage and charging system 10 provided in this embodiment may include at least one secondary battery pack 110. The initial capacity inconsistency of the multiple secondary battery cells 1100 in each secondary battery pack is less than or equal to 10%, and the absolute value of the difference in the initial SOC of the multiple secondary battery cells 1100 is less than or equal to 10%. Thus, before the secondary battery pack is put into use, there is no need for additional charging and discharging to reduce the SOC difference between the multiple secondary battery cells 1100, which simplifies the process of putting the secondary battery pack into use. Furthermore, after the secondary battery pack is put into use, the equalization function of the energy storage device (if such an equalization function exists) can be used to equalize the battery cells, further improving the consistency of the secondary battery cells.

[0074] In some embodiments, the absolute value of the difference in the initial SOC of the plurality of cascaded battery cells 1100 is less than or equal to 5%.

[0075] It should be understood that Figure 1 The components shown are just examples. In actual applications, the components may have different names, or they may be added or deleted as needed.

[0076] In some embodiments, at least one secondary battery pack 110 includes a first secondary battery pack 111, such as Figure 2 As shown, the first-stage battery pack 111 includes multiple secondary-stage battery cells 1100 connected in series.

[0077] As an example, at least one secondary battery pack 110 may include one or more first secondary battery packs 111.

[0078] The positive and negative terminals of each first-stage battery pack 111 are respectively connected to the positive and negative terminals of the power module 115 near the first-stage battery pack 111.

[0079] As an example, each first-stage battery pack 111 may include N secondary-stage battery cells 1100 connected in series.

[0080] As another example, a first-stage battery pack 111 may include M secondary-stage battery cells 1100 connected in series, and another first-stage battery pack 111 may include N secondary-stage battery cells 1100 connected in series.

[0081] In this embodiment, the secondary battery cells 1100 in the first secondary battery pack 111 are connected in series, making the pack simple, convenient and quick to assemble.

[0082] In some embodiments, at least one secondary battery pack 110 includes a second secondary battery pack 112, such as Figure 3 As shown, the second-stage battery pack 112 includes multiple first-stage battery packs 1121 connected in parallel, and each first-stage battery pack 1121 includes multiple battery cells 1100 connected in series.

[0083] As an example, at least one secondary battery pack 110 includes one or more second secondary battery packs 112.

[0084] The positive and negative terminals of each first sub-secondary battery pack 1121 are respectively connected to the positive and negative terminals of the power module 115 near the end of the second secondary battery pack 112. Each first sub-secondary battery pack 1121 includes multiple secondary battery cells 1100 connected in series.

[0085] In this embodiment of the application, the second-stage battery pack 112 is provided with a plurality of first sub-stage battery packs 1121 connected in parallel, and the first sub-stage battery pack 1121 includes a plurality of staged battery cells 1100 connected in series, which can improve the power and capacity of the second-stage battery pack 112, thereby improving the power and capacity of the storage and charging system 10.

[0086] In some embodiments, at least one secondary battery pack 110 includes a third secondary battery pack 113, such as Figure 4 and Figure 5 As shown, the third-stage battery pack 113 includes multiple second-stage battery packs 1131 connected in series, each second-stage battery pack 1131 includes multiple first branches 11311 connected in parallel, and each first branch 11311 includes one or more battery cells 1100 connected in series.

[0087] As an example, at least one secondary battery pack 110 includes one or more third secondary battery packs 113.

[0088] The positive and negative terminals of each third-stage battery pack 113 are respectively connected to the positive and negative terminals of the power module 115 near the end of the third-stage battery pack 113.

[0089] like Figure 4 As shown, each third-stage battery pack 113 includes multiple second-stage battery packs 1131 connected in series, each second-stage battery pack 1131 includes multiple first branches 11311 connected in parallel, and each first branch 11311 includes a single-stage battery cell 1100.

[0090] like Figure 5As shown, each third-stage battery pack 113 includes multiple second-stage battery packs 1131 connected in series, each second-stage battery pack 1131 includes multiple first branches 11311 connected in parallel, and each first branch 11311 includes multiple battery cells 1100 connected in series.

[0091] As an example, the number of secondary battery cells 1100 in multiple first branches 11311 of the same second sub-secondary battery pack 1131 is equal.

[0092] As an example, the number of battery cells connected in series in the first branch 11311 of different second sub-tiered battery packs 1131 can be the same or different. For example, each of the different second sub-tiered battery packs 1131 includes two first branches 11311, and each of the two first branches 11311 in each second sub-tiered battery pack 1131 includes one secondary battery cell 1100. Alternatively, each of the two first branches 11311 in each second sub-tiered battery pack 1131 includes two secondary battery cells 1100 connected in series.

[0093] For example, each of the different second sub-cascade battery packs 1131 includes two first branches 11311. In one second sub-cascade battery pack 1131, each of the two first branches 11311 includes a single cascade battery cell 1100. In another second sub-cascade battery pack 1131, each of the two first branches 11311 includes two cascade battery cells 1100 connected in series.

[0094] In this embodiment, the third-stage battery pack 113 is provided with multiple second-stage battery packs 1131 connected in series. Each second-stage battery pack 1131 includes multiple first branches 11311 connected in parallel, and each first branch includes one or more battery cells 1100 connected in series. This can increase the capacity of a single battery pack and simplify the structural design.

[0095] In some embodiments, at least one secondary battery pack 110 includes a fourth secondary battery pack 114, such as Figure 6 and Figure 7 As shown, the fourth-stage battery pack 114 includes multiple third-stage battery packs 1141 connected in parallel, each third-stage battery pack 1141 includes multiple fourth-stage battery packs 1142 connected in series, each fourth-stage battery pack 1142 includes multiple second branches 11421 connected in parallel, and each second branch 11421 includes one or more secondary battery cells 1100 connected in series.

[0096] As an example, at least one secondary battery pack 110 includes one or more fourth secondary battery packs 114.

[0097] like Figure 6 As shown, each fourth-stage battery pack 114 includes multiple third-stage battery packs 1141 connected in parallel, each third-stage battery pack 1141 includes multiple second-stage battery packs 112 connected in series, each fourth-stage battery pack 1142 includes multiple second branches 11421 connected in parallel, and each second branch 11421 includes one secondary-stage battery cell 1100.

[0098] like Figure 7 As shown, each fourth-stage battery pack 114 includes multiple third-stage battery packs 1141 connected in parallel, each third-stage battery pack 1141 includes multiple second-stage battery packs 112 connected in series, each fourth-stage battery pack 1142 includes multiple second branches 11421 connected in parallel, and each second branch 11421 includes multiple battery cells 1100 connected in series.

[0099] As an example, the number of secondary-use battery cells 1100 in multiple second branches 11421 of the same secondary-use battery pack 112 is equal.

[0100] As an example, the number of battery cells connected in series in the second branch 11421 of different fourth sub-tier battery packs 1142 can be the same or different.

[0101] For example, each of the different fourth sub-battery packs 1142 includes two second branches 11421, and each of the two second branches 11421 in each fourth sub-battery pack 1142 includes one secondary battery cell 1100. Alternatively, each of the two second branches 11421 in each fourth sub-battery pack 1142 includes two secondary battery cells 1100 connected in series.

[0102] For example, each of the different fourth sub-sub-battery packs 1142 includes two second branches 11421. In one fourth sub-sub-battery pack 1142, each of the two second branches 11421 includes a single battery cell 1100, and in another fourth sub-sub-battery pack 1142, each of the two second branches 11421 includes two battery cells 1100 connected in series.

[0103] In this embodiment, the fourth-stage battery pack 114 is provided with multiple parallel third sub-stage battery packs 1141, which can increase the capacity of the fourth-stage battery pack 114, reduce the number of output terminals of the total positive and total negative terminals of the fourth-stage battery pack 114, and simplify the structural design.

[0104] In some embodiments, the storage and charging system 10 may include one or more of a first-stage battery pack 111 to a fourth-stage battery pack, and the number of each type of battery pack may be one or more.

[0105] In some embodiments, such as Figure 8 As shown, the other end of the power module 115 is connected to the bus 20, and the charging device 12 and the power grid 30 are connected to the bus 20.

[0106] As an example, there is one of each of the at least one secondary battery pack 110 and at least one power module 115, with the other end of the power module 115 connected to the bus 20 (not shown in the figure).

[0107] As another example, such as Figure 8 As shown, there are multiple secondary battery packs 110 and multiple power modules 115. The other ends of the multiple power modules 115 are connected in parallel to the bus 20, and the charging device 12 and the power grid 30 are connected to the bus 20.

[0108] In this embodiment, each cascaded battery pack 110 is connected to a power module 115. The other end of the power module 115 is connected to a bus 20, enabling energy transfer between the first energy storage device 11, the charging device 12, and the power grid 30. For example, the first energy storage device 11 can transfer energy to the charging device 12 via the bus 20, the first energy storage device 11 can draw power from the power grid 30 via the bus 20, and the power grid 30 can also transfer energy to the charging device 12 via the bus 20.

[0109] In some embodiments, such as Figure 8 As shown, at least one power module 115 has a switch module 13 connected between the other end of the power module 115 and the bus 20.

[0110] That is, a switch module 13 is connected between the first energy storage device 11 and the bus 20.

[0111] For example, when the first energy storage device 11 needs to operate, the switch module 13 can be closed, thereby enabling energy transfer between the first energy storage device 11, the charging device 12, and the power grid 30. Alternatively, when the first energy storage device 11 does not need to operate, the switch module 13 can be disconnected.

[0112] In this embodiment, a switch module 13 is provided between the node formed by the parallel connection of the other ends of multiple power modules 115 and the bus 20 to facilitate the control of energy transmission between the first energy storage device 11, the charging device 12, and the power grid 30. The switch module 13 can be closed when the first energy storage device 11 needs to operate, and can be opened when the first energy storage device 11 does not need to operate.

[0113] In some embodiments, such as Figure 8 As shown, the energy storage and charging system 10 further includes a first control module 14, which is communicatively connected to the first energy storage device 11 and the charging device 12, and is used to control the energy transmission of the first energy storage device 11 and / or the charging device 12.

[0114] As an example, the charging device 12 may include a charging power module such as a DC / DC converter and a charging gun.

[0115] In this embodiment of the application, the first control module 14 is communicatively connected to the first energy storage device 11 and the charging device 12. When the charging device 12 needs to charge electrical equipment such as electric vehicles, the first control module 14 can control the first energy storage device 11 to transmit electrical energy to the charging device 12 to charge the electrical equipment.

[0116] As an example, the first energy storage device 11, the charging device 12, and the power grid 30 are all connected to the bus 20.

[0117] Therefore, the energy transfer between the first energy storage device 11, the charging device 12, and the power grid 30 can be controlled by the first control module 14. For example, the first control module 14 can control the first energy storage device 11 to transfer energy to the charging device 12, control the first energy storage device 11 to draw power from the power grid 30, and also control the charging device 12 to draw power from the power grid 30.

[0118] In some embodiments, such as Figure 8 As shown, the energy storage and charging system 10 further includes a second energy storage device 15, which is connected to the charging device 12, and the second energy storage device 15 includes at least one non-cascaded battery pack.

[0119] As an example, the first energy storage device 11 can be obtained by expanding the capacity of the existing energy storage and charging system 10. For example, the existing energy storage and charging system 10 includes a second energy storage device 15 and a charging device 12. By modifying the existing energy storage and charging system 10, an energy storage and charging system 10 including a secondary battery pack can be obtained.

[0120] In this embodiment of the application, by modifying the energy storage and charging system 10, which includes the second energy storage device 15, the capacity can be expanded to include the first energy storage device 11, which includes the secondary battery pack. This enables the rational utilization of retired batteries, thereby reducing the environmental impact of directly retiring secondary power batteries and reducing resource waste.

[0121] In some embodiments, such as Figure 8 As shown, the energy storage and charging system 10 further includes a second control module 16, which is communicatively connected to the second energy storage device 15 and the charging device 12, and is used to control the energy transmission of the second energy storage device 15 and / or the charging device 12.

[0122] The second control module 16 is communicatively connected to the second energy storage device 15 and the charging device 12. When the charging device 12 needs to charge electrical equipment such as electric vehicles, the second control module 16 can control the second energy storage device 15 to transmit electrical energy to the charging device 12 to charge the electrical equipment.

[0123] In this embodiment, the energy transmission of the first energy storage device 11 and / or the charging device 12 is controlled by the first control module 14, and the energy transmission of the second energy storage device 15 and / or the charging device 12 is controlled by the second control module 16, which facilitates the energy transmission of the first energy storage device 11 and the second energy storage device 15.

[0124] As an example, the second energy storage device 15 is connected to the bus 20.

[0125] Therefore, the energy transfer between the second energy storage device 15, the charging device 12, and the power grid 30 can be controlled by the second control module 16. For example, the second control module 16 can control the second energy storage device 15 to transfer energy to the charging device 12, control the second energy storage device 15 to draw power from the power grid 30, and also control the charging device 12 to draw power from the power grid 30.

[0126] As an example, when the first energy storage device 11 needs to operate, the connection between the first energy storage device 11 and the charging device 12 and the power grid 30 can be closed, such as by closing the switch module 13 between the first energy storage device 11 and the bus 20. The connection between the second energy storage device 15 and the charging device 12 and the power grid 30 can be disconnected, such as by disconnecting another switch module (not shown in the diagram) between the second energy storage device 12 and the bus 20. Energy transfer between the first energy storage device 11, the charging device 12, and the power grid 30 is achieved through the first control module 14.

[0127] When the second energy storage device 15 needs to operate, the connection between the second energy storage device 15 and the charging device 12 and the power grid 30 can be closed, such as by closing another switch module between the second energy storage device 15 and the bus 20, and the connection between the first energy storage device 11 and the charging device 12 and the power grid 30 can be disconnected, such as by disconnecting the switch module 13 between the first energy storage device 11 and the bus 20. Energy transfer between the second energy storage device 15 and the charging device 12 and the power grid 30 can be realized through the second control module 16.

[0128] As another example, the first control module 14 and the second control module 16 can be connected in communication.

[0129] In this embodiment, by setting the first control module 14 and the second control module 16 to be communicatively connected, the charging and discharging control between the first energy storage device 11, the second energy storage device 15, the charging device 12, and the power grid 30 can be realized without disconnecting the connection between the first energy storage device 11 and the charging device 12 and the power grid 30, such as by disconnecting the switch module 13 between the first energy storage device 11 and the bus 20, and without disconnecting the connection between the second energy storage device 15 and the charging device 12 and the power grid 30, such as by disconnecting another switch module between the second energy storage device 12 and the bus 20.

[0130] The electrical equipment mentioned in the embodiments of this application can refer to vehicles, such as electric vehicles, electric cars, etc. The electrical equipment mentioned in the embodiments of this application can also be other battery-powered devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can be applied to all battery-powered devices.

[0131] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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. A storage and charging system, characterized in that, The energy storage and charging system includes a first energy storage device and a charging device, wherein the first energy storage device includes: At least one secondary battery pack, the secondary battery pack comprising multiple secondary battery cells, wherein the inconsistency in the initial capacity of the multiple secondary battery cells is less than or equal to 10%. At least one power module, one end of which is connected to the at least one secondary battery pack, and the other end of which is connected to the charging device.

2. The storage and charging system according to claim 1, characterized in that, The absolute value of the difference in the initial SOC of the multiple tiered battery cells is less than or equal to 10%.

3. The storage and charging system according to claim 1, characterized in that, The at least one secondary battery pack includes a first secondary battery pack, which includes multiple secondary battery cells connected in series.

4. The storage and charging system according to claim 1, characterized in that, The at least one secondary battery pack includes a second secondary battery pack, the second secondary battery pack includes a plurality of first sub-secondary battery packs connected in parallel, and the first sub-secondary battery packs include a plurality of secondary battery cells connected in series.

5. The storage and charging system according to claim 1, characterized in that, The at least one secondary battery pack includes a third secondary battery pack, the third secondary battery pack includes multiple second sub-secondary battery packs connected in series, the second sub-secondary battery packs include multiple first branches connected in parallel, and the first branch includes one or multiple secondary battery cells connected in series.

6. The storage and charging system according to claim 1, characterized in that, The at least one secondary battery pack includes a fourth secondary battery pack, the fourth secondary battery pack includes multiple third sub-secondary battery packs connected in parallel, the third sub-secondary battery packs include multiple fourth sub-secondary battery packs connected in series, the fourth sub-secondary battery packs include multiple second branches connected in parallel, and the second branch includes one or multiple secondary battery cells connected in series.

7. The storage and charging system according to claim 1, characterized in that, The other end of the power module is connected to the bus, and the charging device and the power grid are connected to the bus.

8. The storage and charging system according to claim 7, characterized in that, The number of the at least one secondary battery pack and the at least one power module are both multiple, and the other ends of the multiple power modules are connected in parallel to the bus.

9. The storage and charging system according to claim 8, characterized in that, A switch module is connected between the other end of the at least one power module and the bus.

10. The storage and charging system according to any one of claims 1 to 9, characterized in that, The storage and charging system also includes: A first control module is communicatively connected to the first energy storage device and the charging device, and is used to control the energy transmission of the first energy storage device and / or the charging device.

11. The storage and charging system according to claim 10, characterized in that, The storage and charging system also includes: A second energy storage device is connected to the charging device, and the second energy storage device includes at least one non-cascaded battery pack.

12. The storage and charging system according to claim 11, characterized in that, The storage and charging system also includes: The second control module is communicatively connected to the second energy storage device and the charging device, and is used to control the energy transmission of the second energy storage device and / or the charging device.

13. The storage and charging system according to claim 12, characterized in that, The first control module is communicatively connected to the second control module.

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