Grouping structure of soft package solid-state battery

Abstract

The invention relates to a grouping structure of a soft package solid-state battery, and belongs to the technical field of battery packs. A plurality of module units are arranged, the plurality of module units are fixed in the box body, and each module unit comprises: a shell, which is provided with two symmetrical first cavities arranged at intervals; the number of the battery cell modules is two, and the two battery cell modules are respectively arranged in the two first cavities; the middle end plate is inserted between the two battery cell modules and is fixed with the box body; and the aluminum end plates are fixed at the two ends of the shell. The middle end plate is used as a rigid connecting piece to clamp the two battery cell modules and transmit mechanical load to the box body, the expansion stress of the battery cell modules is absorbed and dispersed by the middle end plate, the aluminum end plate strengthens the rigidity of the end part of the shell, and the aluminum end plate and the middle end plate jointly construct a continuous self-supporting frame. Therefore, the battery cell modules form a rigid whole in the module units, the flexible characteristic of the battery cells is converted into the structural supporting capacity, and reinforcing ribs or high-strength steel frames do not need to be additionally arranged.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to the assembly of a soft-pack solid-state battery. Background Technology

[0002] The current mainstream design scheme for soft-pack battery modules is to group the cells in a certain series and parallel manner. Heat insulation and auxiliary materials to absorb cell expansion are placed between the cells. Then, the cell tabs and busbars, FPC nickel sheets and busbars are laser welded. Finally, the top and bottom cover plates and the side end plates are installed and welded.

[0003] The current mainstream design schemes for pouch battery modules have low assembly rates and limited heat dissipation capabilities. Especially when facing semi-solid-state batteries with high-nickel / silicon-carbon anode systems, their design defects are significantly amplified in the two core dimensions of structural support and thermal management, resulting in an inability to meet the industry's requirements for high energy density, high safety, and lightweight design.

[0004] Specifically, the contribution of pouch cells to the structural rigidity of the battery pack is severely insufficient after assembly. Pouch cells themselves are flexible structures, and after assembly, they cannot provide effective mechanical support, resulting in a significant reduction in the overall rigidity of the battery pack. To compensate for this deficiency, additional reinforcing ribs, high-strength steel frames, or composite material layers must be added to the casing design to maintain the structural integrity of the battery pack. This additional reinforcement directly increases the weight of the battery pack, not only violating the core goal of lightweighting electric vehicles but also increasing manufacturing costs and restricting the space utilization rate of the battery pack, further reducing energy density. Summary of the Invention

[0005] This application provides a pouch solid-state battery pack structure to solve the problem that existing pouch battery modules in the related technology have insufficient structural support capabilities, requiring additional reinforcement of the housing design, which leads to increased weight, higher costs, and reduced energy density, thus failing to meet the requirements for lightweighting electric vehicles.

[0006] A pouch solid-state battery assembly structure is provided, comprising: a housing; multiple module units fixed within the housing, each module unit comprising: a shell having two symmetrically spaced first cavities; two cell modules respectively arranged within the two first cavities; an intermediate end plate inserted between the two cell modules and fixed to the housing; and aluminum end plates fixed to both ends of the shell.

[0007] By adopting the above technical solution, the housing of the module unit is designed as two symmetrically separated first cavities, so that the battery cell modules are independently housed. This separation not only isolates the heat conduction path between the battery cells and improves the heat dissipation uniformity, but also forms a rigid connection point by inserting the middle end plate between the two battery cell modules and fixing it to the housing. This feature directly transfers the mechanical load of the battery cell modules to the housing frame, improving the necessity of adding additional reinforcing ribs in the traditional solution and greatly reducing the overall weight.

[0008] In some embodiments, the bottom of the housing is provided with longitudinal beams, which pass through the bottom of each module unit and are fixed to the intermediate end plate.

[0009] By adopting the above technical solution: the longitudinal beam, as a through-type support structure, passes through the bottom of the module unit and is rigidly connected to the middle end plate, forming a multi-point load-bearing system of longitudinal beam-middle end plate-module unit.

[0010] In some embodiments, the height of the longitudinal beam is set to 20~35mm.

[0011] By adopting the above technical solution, the longitudinal beam height is set to 20~35mm, which precisely optimizes the longitudinal stiffness and weight ratio.

[0012] In some embodiments, a second cavity is formed between the two first cavities of each module unit, the bottom of the second cavity being open, and the longitudinal beam passes through the bottom of the second cavity between the plurality of module units and is fixed to the intermediate end plate.

[0013] By adopting the above technical solution, the design of placing the second cavity between the two first cavities with an open bottom improves the structural redundancy problem caused by the flexibility of the battery cell. The second cavity serves as a dedicated passageway for the longitudinal beam, avoiding the need for additional openings or reinforcements to occupy internal space, thus improving the utilization rate of the internal space of the battery pack. At the same time, the open bottom of the second cavity ensures that the longitudinal beam passes vertically through the gap between the module units, eliminating the stress concentration caused by the misalignment of the longitudinal beam and the end plate in the traditional design, making the longitudinal load transmission path shorter and more direct.

[0014] In some embodiments, the intermediate end plate includes: a bottom support extending from the bottom of the second cavity, through which the longitudinal beam passes; and a top frame disposed on the bottom support, with reinforcing ribs inside the top frame and threaded holes on the reinforcing ribs.

[0015] By adopting the above technical solution: the bottom support extends from the bottom of the second cavity and runs through the middle of the longitudinal beam, achieving uniform force distribution. In addition, the design of the top frame integrated on the bottom support and with built-in reinforcing ribs enhances the overall rigidity of the end plate from a mechanical perspective. As the core component for bending resistance, the distributed structure of the reinforcing ribs evenly disperses thermal expansion stress and mechanical load, reducing the deformation of the end plate in high-temperature environments and avoiding the reduction of heat dissipation gaps due to deformation, thereby steadily improving heat dissipation efficiency. The pre-set threaded holes on the reinforcing ribs, combined with the bolt fixing method, not only achieve quick and reversible mechanical connection, but also allow for precise adjustment of the end plate position during maintenance, avoiding micro-cracks caused by welding stress.

[0016] In some embodiments, the housing is also equipped with a liquid cooling plate.

[0017] By adopting the above technical solution, the heat of the battery cell is carried away by the coolant flowing on the liquid cooling plate, thus ensuring the heat dissipation efficiency of the battery pack.

[0018] In some embodiments, the liquid cooling plate is disposed above and / or below the plurality of module units.

[0019] By adopting the above technical solution, liquid cooling plates are simultaneously placed above and below multiple module units, achieving symmetrical and efficient heat flow paths. The upper liquid cooling plate covers the top of the module unit, directly absorbing the high heat flow from the upper surface of the cell, while the lower liquid cooling plate is closely attached to the bottom of the module unit, efficiently dissipating heat from the lower surface of the cell, thus improving heat dissipation efficiency. Placing the liquid cooling plates above multiple module units forms an efficient heat exchange interface, improving the uniformity of the battery pack's operating temperature distribution, effectively suppressing local hot spots in high heat generation scenarios, and reducing the internal space occupied. Placing the liquid cooling plates below multiple module units enables precise optimization of thermal management through bottom active cooling, significantly improving heat dissipation efficiency and structural synergy, while not occupying space above the module units.

[0020] In some embodiments, the assembly structure further includes a cover plate connected above the module unit, the cover plate having a flow channel for coolant circulation, so that the cover plate constitutes the liquid cooling plate.

[0021] By adopting the above technical solution: the cover plate is an integrated liquid cooling plate, and by setting a coolant flow channel inside the cover plate, the cover plate directly undertakes the thermal management function, achieving a systematic breakthrough in heat dissipation efficiency and structural lightweighting.

[0022] In some embodiments, the housing is welded and fixed to the intermediate end plate and the box body.

[0023] By adopting the above technical solution, the shell, intermediate end plate and box are fixed by welding. By constructing a permanent rigid connection system, the defect of insufficient structural rigidity caused by the flexibility of soft-pack battery cells is fundamentally solved, and the module unit is upgraded from passively relying on external reinforcement to actively supporting the main body.

[0024] In some embodiments, the bottom of the housing is provided with an exhaust port.

[0025] By adopting the above technical solution, a directional gas pressure relief channel is constructed through the exhaust port, and gravity is used to guide the gas to be released preferentially from the bottom, avoiding local overpressure failure caused by gas accumulation at the top.

[0026] The beneficial effects of the technical solution provided in this application include: This application provides a soft-pack solid-state battery pack structure, in which two cell modules are symmetrically arranged in two first cavities of the casing, and a middle end plate is inserted between the cell modules and rigidly fixed to the casing. At the same time, aluminum end plates are fixed at both ends of the casing to form end constraints. This design makes the module unit no longer dependent on external reinforcement structures after assembly: the middle end plate acts as a rigid connector, clamping the two cell modules and transmitting mechanical loads to the casing. The expansion stress of the cell modules is absorbed and dispersed by the middle end plate, while the aluminum end plate strengthens the rigidity of the casing ends, and together with the middle end plate, they form a continuous self-supporting frame. Thus, the cell modules form a rigid whole within the module unit, and the flexible characteristics of the cell are transformed into structural support capacity, without the need for additional reinforcing ribs or high-strength steel frames. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application; Figure 2 A schematic diagram illustrating the module unit provided for embodiments of this application; Figure 3 A schematic diagram illustrating the housing provided for an embodiment of this application; Figure 4 A schematic diagram illustrating a battery cell module provided for an embodiment of this application; Figure 5 A schematic diagram illustrating the longitudinal beam provided for an embodiment of this application; Figure 6 A schematic diagram illustrating the intermediate end plate provided in an embodiment of this application; Figure 7 A schematic diagram illustrating a liquid cooling plate provided for an embodiment of this application; Figure 8 A schematic diagram illustrating the exhaust port provided for an embodiment of this application; In the diagram: 1. Housing; 10. Frame; 11. Bottom plate; 2. Module unit; 3. Shell; 30. First cavity; 31. Second cavity; 4. Battery cell module; 40. Battery cell; 41. Busbar bracket; 5. Middle end plate; 50. Bottom bracket; 51. Top frame; 52. Reinforcing rib; 53. Threaded hole; 6. Aluminum end plate; 7. Longitudinal beam; 8. Liquid cooling plate; 9. Exhaust port. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] This application provides a pouch solid-state battery pack structure that solves the problem in the related technology where existing pouch battery modules have insufficient structural support capabilities, requiring additional reinforcement of the housing design, resulting in increased weight, higher costs, and reduced energy density, thus failing to meet the lightweighting requirements of electric vehicles.

[0031] Reference Figure 1-8 A soft-pack solid-state battery assembly structure includes: a housing 1 and module units 2. The housing 1 includes a frame 10 and a bottom protective plate 11. The frame 10 is a rectangular frame with an internal cavity, and the bottom protective plate 11 is located at the bottom of the frame 10. Multiple module units 2 are arranged within the housing 1 and fixed within the housing 1. Each module unit 2 includes a housing 3, a cell module 4, an intermediate end plate 5, and an aluminum end plate 6. The housing 3 has two symmetrically arranged and separated first cavities 30. Two cell modules 4 are arranged within the two first cavities 30, respectively. Each cell module 4 consists of stacked cells 40 and busbar supports 41 located at both ends of the cells 40. The intermediate end plate 5 is inserted between the two cell modules 4 and fixed to the housing 1. The aluminum end plates 6 are fixed to both ends of the housing 3.

[0032] In this application, the housing 1 adopts a structure with a rectangular frame 10, an internal cavity, and a bottom protective plate 11, providing a standardized installation space for the module unit 2. The housing 3 of the module unit 2 is designed as two symmetrically separated first cavities 30, allowing the cell modules 4 to be independently housed. This separation not only isolates the heat conduction path between the cells 40 and improves the heat dissipation uniformity, but also absorbs the expansion stress of the cells 40 through the elastic design of the busbar bracket 41, significantly improving thermal management capabilities, especially suitable for high heat yield scenarios in high-nickel / silicon-carbon systems. Furthermore, by inserting the intermediate end plate 5 between the two cell modules 4 and fixing it to the housing 1, this feature forms a rigid connection point, directly transferring the mechanical load of the cell module 4 to the frame of the housing 1, eliminating the need for additional reinforcing ribs 52 in traditional solutions. At the same time, the aluminum end plate 6 maintains structural rigidity while significantly reducing the overall weight, avoiding the violation of the lightweight goal.

[0033] In summary, this application achieves more uniform heat flow distribution and improved heat dissipation efficiency through the design of the first cavity 30; the plug-in fixing structure of the intermediate end plate 5 enhances the deformation resistance of the module unit 2, directly reducing the amount of additional reinforcing components used in the housing 1; and the lightweight application of the aluminum end plate 6 reduces the weight of the battery pack while improving space utilization. These improvements work together to make the battery pack self-sufficient in terms of structural support, eliminating the need for external reinforcement. The cell module 4, the end plate, and the housing 1 form an integrated rigid system, allowing the module itself to contribute structural rigidity instead of relying on external reinforcing components, thereby eliminating the problems of increased weight, cost, and wasted space at the source. In terms of effects, it not only significantly improves structural rigidity and thermal management but also achieves weight reduction and improved space utilization through lightweight materials such as the aluminum end plate 6, ultimately optimizing energy density, safety, and lightweight indicators in a synergistic manner, meeting the stringent requirements of high-nickel / silicon-carbon semi-solid-state batteries for high energy density and high safety.

[0034] In this application, to achieve the fixation of the intermediate end plate 5 and to further improve the lightweight design effect, a longitudinal beam 7 is provided at the bottom of the housing 1. The longitudinal beam 7 passes through the bottom of each module unit 2 and is fixed to the intermediate end plate 5. The height of the longitudinal beam 7 is set to 20~35mm. The longitudinal stress of the battery pack is efficiently transferred to the base of the housing 1 through the longitudinal beam 7, avoiding the accumulation of local deformation caused by the flexibility of the battery cell 40 in the traditional design. Specifically, the longitudinal beam 7, as a through-type support structure, passes through the bottom of the module unit 2 and is rigidly connected to the intermediate end plate 5, forming a multi-point load-bearing system of longitudinal beam 7-intermediate end plate 5-module unit 2: the longitudinal stiffness of the longitudinal beam 7 directly offsets the lateral expansion stress when the battery cell 40 is stacked, preventing the gap between the battery cells 40 from shrinking due to deformation, thereby maintaining the stability of the heat dissipation channel; at the same time, the intermediate end plate 5, as a key connection point, evenly distributes the supporting force of the longitudinal beam 7 to both sides of the module unit 2, so that the mechanical load of the battery cell module 4 no longer depends on the external reinforcing rib 52, but is efficiently absorbed by the module's own structure. The height of the longitudinal beam 7 is set at 20~35mm, precisely optimizing the longitudinal stiffness and weight ratio.

[0035] Furthermore, to effectively fix the intermediate end plate 5 to the longitudinal beam 7 and make reasonable use of space, a second cavity 31 is formed between the two first cavities 30 of each module unit 2. The bottom of the second cavity 31 is open, and the longitudinal beam 7 passes through the bottom of the second cavity 31 between the multiple module units 2 and is fixed to the intermediate end plate 5. The intermediate end plate 5 includes a bottom support 50 and a top frame 51. The bottom support 50 extends from the bottom of the second cavity 31, and the longitudinal beam 7 passes through the middle of the bottom support 50. The top frame 51 is provided on the bottom support 50, and a reinforcing rib 52 is provided inside the top frame 51. The reinforcing rib 52 is provided with a threaded hole 53, and bolts are used to fix the intermediate end plate 5 to the longitudinal beam 7 through the threaded hole 53.

[0036] The design of placing the second cavity 31 between the two first cavities 30 with an open bottom improves the structural redundancy problem caused by the flexibility of the battery cell 40. The second cavity 31 serves as a dedicated passageway for the longitudinal beam 7, avoiding additional openings or reinforcements that would occupy internal space, thus improving the utilization rate of the battery pack's internal space. At the same time, the open bottom of the second cavity 31 ensures that the longitudinal beam 7 passes vertically through the gaps in the module units 2, eliminating stress concentration caused by misalignment between the longitudinal beam 7 and the end plate in traditional designs, making the longitudinal load transmission path shorter and more direct. The bottom bracket 50 extends from the bottom of the second cavity 31 and passes through the middle of the longitudinal beam 7, achieving uniform force distribution. Furthermore, the design of the top frame 51 integrated onto the bottom support 50 and incorporating reinforcing ribs 52 enhances the overall rigidity of the end plate from a mechanical perspective. As a core component for bending resistance, the distributed structure of the reinforcing ribs 52 evenly disperses thermal expansion stress and mechanical loads, reducing the deformation of the end plate under high-temperature conditions and preventing the reduction of heat dissipation gaps due to deformation. This stabilizes and improves heat dissipation efficiency, especially in high-heat-yield scenarios of high-nickel / silicon-carbon semi-solid-state batteries, effectively suppressing the risk of thermal runaway caused by localized overheating. The pre-drilled threaded holes 53 on the reinforcing ribs 52, combined with bolt fixing, not only achieve quick and reversible mechanical connection but also allow for precise adjustment of the end plate position during maintenance, preventing micro-cracks caused by welding stress.

[0037] In summary, the intermediate end plate 5 is upgraded from a passive support point to an active rigid node. Its core value lies in the coordinated design of the second cavity 31, bottom bracket 50, top frame 51, and threaded hole 53, which achieves precise force transmission, lightweight structure, and reliable connection.

[0038] In this application, the housing 3 is further welded and fixed to the intermediate end plate 5 and the box body 1. The housing 3 is fixed to the intermediate end plate 5 and the box body 1 by welding. By constructing a permanent rigid connection system, the defect of insufficient structural rigidity caused by the flexibility of the soft-pack battery cell 40 is fundamentally solved, and the module unit 2 is upgraded from passively relying on external reinforcement to an active structural support body.

[0039] Additionally, an exhaust port 9 is provided at the bottom of the casing 3. A directional gas pressure relief channel is constructed through the exhaust port 9, and gravity guides the gas to be released preferentially from the bottom, avoiding local overpressure failure caused by gas accumulation at the top.

[0040] In this application, a liquid cooling plate 8 is also provided inside the casing 1. (See reference...) Figure 7The diagram illustrates the placement of liquid cooling plates 8 above and below multiple module units 2. Innovatively, liquid cooling plates 8 are simultaneously positioned above and below multiple module units 2 within the housing 1, achieving symmetrical and efficient heat flow paths. The upper liquid cooling plate 8 covers the top of the module unit 2, directly absorbing the high heat flux from the upper surface of the battery cell 40, especially in high-heat-yield scenarios of high-nickel / silicon-carbon anode systems. Meanwhile, the lower liquid cooling plate 8 is tightly fitted to the bottom of the module unit 2, efficiently dissipating heat from the lower surface of the battery cell 40, thus improving heat dissipation efficiency.

[0041] In some optional embodiments, a liquid cooling plate 8 is added inside the housing 1 and placed above multiple module units 2. The liquid cooling plate 8 evenly covers the top of the module units 2, forming a high-efficiency heat exchange interface, which improves the uniformity of the battery pack's operating temperature distribution and effectively suppresses local hot spots in high heat generation scenarios. In addition, the liquid cooling plate 8 is located above the module units 2, reducing the internal space it occupies.

[0042] In some alternative embodiments, the liquid cooling plate 8 is placed below multiple module units 2. The liquid cooling plate 8 is added inside the housing 1 and placed below multiple module units 2. The thermal management is precisely optimized through bottom active cooling, which significantly improves heat dissipation efficiency and structural synergy, while not occupying the space above the module units 2.

[0043] In some optional embodiments, the assembly structure also includes a cover plate connected above the module unit 2. The cover plate has channels for coolant flow, thus forming a liquid cooling plate 8. As an integrated liquid cooling plate 8, the cover plate directly undertakes thermal management functions by incorporating coolant flow channels within it, achieving a systemic breakthrough in heat dissipation efficiency and structural lightweighting. The core of this design lies in transforming a cover plate, originally used only for sealing, into a high-efficiency heat exchange component. Its flow channel layout precisely matches the heat source distribution of the battery cells 40 at the top of the module unit 2, allowing the coolant to directly contact the upper surface of the battery cells 40, improving heat dissipation efficiency. Simultaneously, the cover plate, as a structural component, is rigidly connected to the top of the module unit 2, maintaining ultra-high space utilization and improving the overall rigidity of the battery pack.

[0044] The implementation principle of this application is as follows: By using the self-supporting structure of the module unit 2, the shell 3, the intermediate end plate 5, and the box 1 are welded and fixed to form a rigid whole. Combined with the bottom longitudinal beam 7 of the box 1 passing through the bottom of the module unit 2 and rigidly connected to the intermediate end plate 5, a multi-point load-bearing system of longitudinal beam 7-intermediate end plate 5-module unit 2 is constructed. The module unit 2 itself contributes structural rigidity, eliminating the need for additional reinforcing ribs 52, significantly improving bending resistance, effectively reducing weight, and achieving high energy density. At the same time, the innovative design of the bottom opening of the second cavity 31 enables the precise insertion of the longitudinal beam 7, and optimizes the structure of the intermediate end plate 5. The bottom bracket 50 passes through the middle of the longitudinal beam 7, and the top frame 51 has built-in reinforcing ribs 52 and threaded holes 53, ensuring the shortest force transmission path and uniform stress distribution, significantly improving structural reliability. In terms of thermal management, an integrated liquid cooling system is formed by integrating liquid cooling plates 8 above and / or below module unit 2 or by setting flow channels within the cover plate. This achieves symmetrical heat exchange between the upper and lower parts, significantly improving heat dissipation efficiency, effectively suppressing local hot spots, and greatly reducing the risk of thermal runaway. Furthermore, in conjunction with the exhaust port 9 at the bottom of the housing 3, directional pressure relief is achieved in the initial stage of thermal runaway, maintaining a stable heat dissipation gap and further extending the cell's 40-cycle life. In terms of manufacturing, welding and fixing processes replace traditional connection methods, simplifying the assembly process, improving yield, and supporting rapid maintenance.

[0045] In the description of this application, it should be noted that the terms "upper," "lower," 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 application and 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. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A group structure of a soft-pack solid-state battery, characterized by, It comprises: a box (1); a plurality of module units (2) are provided, the plurality of module units (2) are fixed in the box (1), and each module unit (2) comprises: a shell (3) having two symmetrical and separated first cavities (30); two battery cell modules (4) are provided, and the two battery cell modules (4) are arranged in the two first cavities (30) respectively; an intermediate end plate (5) is inserted between the two battery cell modules (4) and fixed with the box (1); aluminum end plates (6) are fixed at both ends of the shell (3).

2. The grouping structure of the soft-pack solid-state battery of claim 1, wherein: The box (1) is provided with longitudinal beams (7) at the bottom, the longitudinal beams (7) are arranged at the bottom of each module unit (2) and fixed with the intermediate end plate (5).

3. The grouping structure of soft-pack solid-state batteries of claim 2, wherein: The height of the longitudinal beam (7) is 20-35mm.

4. The grouping structure of the soft-pack solid-state battery of claim 2, wherein: A second cavity (31) is formed between the two first cavities (30) of each module unit (2), the bottom of the second cavity (31) is open, and the longitudinal beam (7) passes through the bottom of the second cavity (31) between the plurality of module units (2) and is fixed with the intermediate end plate (5).

5. The grouping structure of soft-pack solid-state batteries of claim 4, wherein: The intermediate end plate (5) comprises: a bottom support (50) extending from the bottom of the second cavity (31), and the longitudinal beam (7) passes through the middle of the bottom support (50); a top frame (51) provided on the bottom support (50) and provided with a reinforcing rib (52) inside the top frame (51), and the reinforcing rib (52) is provided with a threaded hole (53).

6. The grouping structure of a soft-pack solid state battery of claim 1, wherein: The box (1) is further provided with a liquid cooling plate (8).

7. The grouping structure of soft-pack solid-state batteries of claim 6, wherein: The liquid cooling plate (8) is arranged above and / or below the plurality of module units (2).

8. The grouping structure of the soft-pack solid state battery of claim 6, wherein: The group structure further comprises a cover plate connected above the module unit (2), and the cover plate is provided with a flow channel for the flow of cooling liquid, so that the cover plate constitutes the liquid cooling plate (8).

9. The grouping structure of the soft-pack solid state battery of claim 1, wherein: The shell (3) is welded and fixed with the intermediate end plate (5) and the box (1).

10. The grouping structure of the soft-pack solid state battery of claim 1, wherein: The bottom of the shell (3) is provided with an exhaust port (9).

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