A series-parallel hybrid battery module of an energy storage system and a photovoltaic energy storage system

Abstract

The utility model discloses a kind of series-parallel hybrid battery module of energy storage system and photovoltaic energy storage system, comprising: battery pack body, first battery module, second battery module, third battery module, fourth battery module;The first battery module The second battery module The third battery module The fourth battery module is sequentially arranged along the first direction in battery pack body, and is arranged side by side along the second direction perpendicular to the first direction, and electrical assembly sub-area is equipped in the position of the end side away from battery pack body and the opposite side close to battery pack body, the span of the electrical assembly sub-area along first direction, greater than the sum of the span of the first battery module and the second battery module along first direction.This application has the beneficial effect that uneven arrangement of battery module is used to reserve electrical assembly sub-area, and this uneven arrangement can make the structure of battery module compact and reasonable and the scheme cost more optimized.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a series-parallel hybrid battery module for an energy storage system and a photovoltaic energy storage system. Background Technology

[0002] In new energy storage systems, battery cells need to be installed in battery modules. Due to the different electrical parameter requirements of the system modules, the battery cells often need to be connected in various series or parallel structures to achieve the voltage, current, capacity, energy and other indicators required by the battery module or energy storage system.

[0003] The aforementioned series or parallel connections must adhere to certain electrical principles: sometimes series connection of cells alone is insufficient, sometimes parallel connection design is necessary, and sometimes a combination of series and parallel connections is required. Therefore, battery placement methods are diverse, which places higher demands on the overall size of the battery module. Based on this, the industry needs to design a hybrid series-parallel battery module solution for energy storage systems, resulting in a compact and rational battery module structure and optimized cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to design a series-parallel hybrid battery module for an energy storage system. The battery module is arranged in a non-uniform manner to reserve an electrical assembly area. This non-uniform arrangement can make the battery module structure compact and reasonable and optimize the solution cost.

[0005] In a first aspect, embodiments of this application propose a series-parallel hybrid battery module for an energy storage system. The series-parallel hybrid battery module includes: a battery pack body, a first battery module, a second battery module, a third battery module, and a fourth battery module. The first battery module, the second battery module, the third battery module, and the fourth battery module are all arranged sequentially along a first direction within the battery pack body and arranged side-by-side along a second direction perpendicular to the first direction. An electrical assembly sub-region is provided at an end away from the battery pack body and near the opposite side of the battery pack body. The span of the electrical assembly sub-region along the first direction is greater than the sum of the spans of the first battery module and the second battery module along the first direction.

[0006] Furthermore, the battery pack body of the series-parallel hybrid battery module is sequentially divided into a first body region near the end side and a second body region near the opposite side along the second direction; within the first body region, the end-side portions of the first battery module, the second battery module, the third battery module, and the fourth battery module are arranged sequentially along the first direction; within the second body region, the area excluding the opposite-side portions of the third and fourth battery modules is an electrical assembly sub-region, and the electrical assembly sub-region, the opposite-side portions of the third and fourth battery modules are arranged sequentially along the first direction.

[0007] A further technical solution is that the number of cells in the first battery module is equal to the number of cells in the second battery module, and the number of cells in the third battery module is equal to the number of cells in the fourth battery module.

[0008] A further technical solution is that the first battery module, the second battery module, the third battery module, and the fourth battery module are connected in series.

[0009] A further technical solution is that the number of cells in the third battery module is greater than the number of cells in the first battery module, and is 1.2 to 1.5 times the number of cells in the first battery module.

[0010] A further technical solution is that both the first battery module and the second battery module have seven battery cells.

[0011] A further technical solution is that the number of opposite portions of the third battery module in the second body area is two, and the number of opposite portions of the fourth battery module in the second body area is two.

[0012] A further technical solution is that the volume of the electrical assembly sub-region is greater than the sum of the volumes of the opposite side portions of the third battery module and the fourth battery module.

[0013] In summary, new energy storage systems require the assembly of battery cells within battery modules. Due to varying electrical parameter requirements of the system modules, these cells often need to be connected in series or parallel to achieve the voltage, current, capacity, and energy specifications required by the battery module or energy storage system. Such series or parallel connections must adhere to certain electrical principles: sometimes series connection alone is insufficient, sometimes parallel design is necessary, and sometimes a combination of series and parallel connections is required. Therefore, the placement of batteries varies, placing higher demands on the overall size of the battery module. Based on this, this application proposes a hybrid series-parallel battery module for energy storage systems, employing a non-uniform arrangement of battery modules to reserve space for electrical assembly sub-areas. This non-uniform arrangement allows for a more compact and rational battery module structure and optimizes the overall cost. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the series-parallel hybrid battery module proposed in this utility model.

[0016] Figure 2 This is another structural schematic diagram of the series-parallel hybrid battery module proposed in this utility model.

[0017] Figure 3 This is an internal schematic diagram of the series-parallel hybrid battery module proposed in this utility model. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Similar component reference numerals in the drawings represent similar components. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] It should be understood that the terminology used in this specification of embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the present invention. As used in this specification of embodiments of the present invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0020] Example See Figures 1 to 3 The image shows a series-parallel hybrid battery module for an energy storage system proposed in an embodiment of this utility model. See details below. Figure 1 The series-parallel hybrid battery module includes: a battery pack body 1, a first battery module 1A, a second battery module 1B, a third battery module 1C, and a fourth battery module 1D. The first battery module 1A, the second battery module 1B, the third battery module 1C, and the fourth battery module 1D are arranged sequentially along a first direction within the battery pack body 1 (green arrow), and arranged side-by-side along a second direction perpendicular to the first direction (orange arrow). An electrical assembly sub-region 2 is provided at an end away from the battery pack body 1 and near the opposite side of the battery pack body 1. The span of the electrical assembly sub-region 2 along the first direction is greater than the sum of the spans of the first battery module 1A and the second battery module 1B along the first direction. In the above scheme, the electrical assembly sub-region is reserved by unevenly arranging the battery modules; that is, the number of the first battery module 1A and the second battery module 1B is different from the number of the third battery module 1C and the fourth battery module 1D, i.e., an uneven arrangement.

[0021] Further details can be found in the following documents. Figure 2 The battery pack body 1 of the series-parallel hybrid battery module is divided into a first body region near the end side and a second body region near the opposite side along the second direction. In the first body region, the end side portions of the first battery module 1A, the second battery module 1B, the third battery module 1C, and the fourth battery module 1D are arranged in sequence along the first direction. In the second body region, the area other than the opposite side portions of the third battery module 1C and the fourth battery module 1D is the electrical assembly sub-region 2. The electrical assembly sub-region 2, the opposite side portions of the third battery module 1C, and the opposite side portions of the fourth battery module 1D are arranged in sequence along the first direction.

[0022] A further technical solution is that the number of cells in the first battery module 1A is equal to the number of cells in the second battery module 1B, and the number of cells in the third battery module 1C is equal to the number of cells in the fourth battery module 1D.

[0023] A further technical solution is that the first battery module 1A, the second battery module 1B, the third battery module 1C, and the fourth battery module 1D are connected in series.

[0024] A further technical solution is that the number of cells in the third battery module 1C is greater than the number of cells in the first battery module 1A, and is 1.2 to 1.5 times the number of cells in the first battery module 1A.

[0025] A further technical solution is that the number of battery cells in both the first battery module 1A and the second battery module 1B is seven.

[0026] A further technical solution is that the number of opposite portions of the third battery module 1C in the second body area is two, and the number of opposite portions of the fourth battery module 1D in the second body area is two.

[0027] A further technical solution is that the volume of the electrical assembly sub-region 2 is greater than the sum of the volumes of the opposite side of the third battery module 1C and the opposite side of the fourth battery module 1D.

[0028] When applied to real-world scenarios, the above solutions can achieve the following: First, the compact container design allows for a larger container capacity, saving on shipping costs; second, the smaller size and lighter weight make it easier for on-site installation personnel to carry out the work; third, it makes maintenance or replacement more convenient for after-sales personnel; fourth, the compact design takes up less installation space for customers; and fifth, it allows for the storage of more machines in the warehouse.

[0029] This utility model includes a battery pack body 1, a first battery module 1A, a second battery module 1B, a third battery module 1C, a fourth battery module 1D, and an electrical assembly sub-area 2. The first battery module 1A consists of 7 cells arranged horizontally, the second battery module 1B consists of 7 cells arranged horizontally, the third battery module 1C consists of 9 cells arranged horizontally, and the fourth battery module 1D consists of 9 cells arranged horizontally, forming a 7+7+9+9 arrangement. The four battery modules 1A, 1B, 1C, and 1D are generally connected in series, and the cells within each module may be connected in parallel or in series.

[0030] Compared with the prior art, the first battery module and the second battery module of this application each have seven battery cells, while the other battery modules each have nine cells. This 7+7+9+9 arrangement makes full use of the internal space, making the container structure design more compact, space utilization more efficient, and container size smaller. Furthermore, it also reduces costs and increases the container capacity of the battery unit, allowing a single container to hold more battery units, which is beneficial for further amortizing and saving on freight costs, thus optimizing the solution cost.

[0031] Furthermore, such as Figure 3 As shown, the first battery module 1A, the second battery module 1B, the third battery module 1C, and the fourth battery module 1D are connected in series from top to bottom, with a total of 32 cells. The 32 cells are connected in series and in parallel, and are arranged unevenly. Figure 3Number 6 is the main positive busbar, number 12 is the main negative busbar, number 7 is the cell terminal shorting busbar, and numbers 8, 9, 10, 11 and 13 are all inter-module connection busbars.

[0032] Furthermore, each module has 8 cells. The first battery module 1A corresponds to cells A1-A8, the second battery module 1B corresponds to cells B1-B8, the third battery module 1C corresponds to cells C1-C8, and the fourth battery module 1D corresponds to cells D1-D8. In the first battery module 1A, cells A2-A7 are connected in pairs in parallel, with their positive and negative terminals connected end-to-end. In the second battery module 1B, cells B2-B7 are also connected in pairs in parallel, with their positive and negative terminals connected end-to-end. On the other hand, A1 and B1 are connected in parallel via busbars 8 and 9. Furthermore, the third battery module 1C and the fourth battery module 1D follow the same design approach.

[0033] In summary, new energy storage systems require the assembly of battery cells within battery modules. Due to varying electrical parameter requirements of the system modules, these cells often need to be connected in series or parallel to achieve the voltage, current, capacity, and energy specifications required by the battery module or energy storage system. Such series or parallel connections must adhere to certain electrical principles: sometimes series connection alone is insufficient, sometimes parallel design is necessary, and sometimes a combination of series and parallel connections is required. Therefore, the placement of batteries varies, placing higher demands on the overall size of the battery module. Based on this, this application proposes a hybrid series-parallel battery module for energy storage systems, employing a non-uniform arrangement of battery modules to reserve space for electrical assembly sub-areas. This non-uniform arrangement allows for a more compact and rational battery module structure and optimizes the overall cost.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0039] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0040] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A series-parallel hybrid battery module for an energy storage system, characterized in that, The series-parallel hybrid battery module includes: The battery pack includes a main body, a first battery module, a second battery module, a third battery module, and a fourth battery module. The first battery module, the second battery module, the third battery module, and the fourth battery module are arranged sequentially along a first direction within the main body of the battery pack and arranged side by side along a second direction perpendicular to the first direction. An electrical assembly sub-region is provided at an end away from the main body of the battery pack and at a position close to the opposite side of the main body of the battery pack. The span of the electrical assembly sub-region along the first direction is greater than the sum of the spans of the first battery module and the second battery module along the first direction.

2. The series-parallel hybrid battery module of the energy storage system according to claim 1, characterized in that: The battery pack body of the series-parallel hybrid battery module is divided into a first body region near the end side and a second body region near the opposite side along the second direction; within the first body region, the end side portions of the first battery module, the second battery module, the third battery module, and the fourth battery module are arranged sequentially along the first direction. Within the second body area, the area excluding the opposite portions of the third battery module and the fourth battery module is the electrical assembly sub-area. The electrical assembly sub-area, the opposite portions of the third battery module and the fourth battery module are arranged sequentially along the first direction.

3. The series-parallel hybrid battery module of the energy storage system according to claim 2, characterized in that: The number of cells in the first battery module is equal to the number of cells in the second battery module, and the number of cells in the third battery module is equal to the number of cells in the fourth battery module.

4. The series-parallel hybrid battery module of the energy storage system according to claim 3, characterized in that: The first battery module, the second battery module, the third battery module, and the fourth battery module are connected in series.

5. The series-parallel hybrid battery module of the energy storage system according to claim 4, characterized in that: The number of cells in the third battery module is greater than the number of cells in the first battery module, and is 1.2 to 1.5 times the number of cells in the first battery module.

6. The series-parallel hybrid battery module of the energy storage system according to claim 5, characterized in that: Both the first battery module and the second battery module have seven battery cells.

7. The series-parallel hybrid battery module of the energy storage system according to claim 6, characterized in that: There are two opposite portions of the third battery module in the second body area, and there are two opposite portions of the fourth battery module in the second body area.

8. The series-parallel hybrid battery module of the energy storage system according to claim 7, characterized in that: The volume of the electrical assembly sub-region is greater than the sum of the volumes of the opposite side portions of the third battery module and the fourth battery module.

9. A photovoltaic energy storage system, characterized in that, The photovoltaic energy storage system includes a series-parallel hybrid battery module as described in any one of claims 1 to 8.

Images