Solid-state battery module, method for assembling solid-state battery module, and vehicle

Abstract

The embodiment of the present disclosure provides a solid-state battery module, an assembling method of the solid-state battery module and a vehicle, and relates to the technical field of vehicles.The solid-state battery module comprises a plurality of battery cells, a plurality of first supporting pieces, a binding belt and two second supporting pieces, the plurality of battery cells and the plurality of first supporting pieces are located between the two second supporting pieces; the plurality of battery cells and the plurality of first supporting pieces are alternately stacked to form a stacked piece, and the two outermost battery cells are adjacent to the two second supporting pieces respectively, and the binding belt surrounds and compresses the stacked piece.The first supporting piece arranged between the adjacent battery cells has high compressive stress and good resilience, can effectively absorb the expansion deformation of the battery cells during the charging and discharging process of the battery cells, thereby buffering the stress between the battery cells, avoiding damage to the stacked structure of the first supporting piece and the battery cells caused by excessive stress, and the binding belt can meet the pre-tightening force requirement in the stacking process of the battery cells.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and in particular to a solid-state battery module, a method for assembling a solid-state battery module, and a vehicle. Background Technology

[0002] Solid-state batteries, as a novel energy storage technology, use solid electrolytes instead of traditional liquid electrolytes. They possess potential for high energy density, high safety, and long cycle life, and are considered an important future direction for battery technology. In recent years, with advancements in materials science, solid-state batteries have achieved significant improvements in key performance aspects such as electrolyte ionic conductivity and interface stability, and are gradually moving towards industrial applications.

[0003] In related technologies, the common structural designs of solid-state battery modules largely follow those of liquid lithium-ion batteries, such as using multiple cells connected in series or parallel, external supports, heat dissipation structures, and electrical connection components. These designs typically use metal or plastic frames to fix the cells and achieve electrical connections between cells through busbars, while relying on air cooling, liquid cooling, or phase change materials for thermal management. During charging and discharging, solid-state batteries require a stable and close contact between the electrodes and the solid electrolyte, as well as a certain stacking pressure, to ensure ion transport efficiency and prevent interface degradation. The structure of solid-state battery modules is not optimized for the volume change characteristics of solid-state batteries, and a continuous and uniform internal pressure maintenance structure is not designed, leading to increased interface impedance and accelerated capacity decay during long-term cycling. Summary of the Invention

[0004] In view of this, the present disclosure provides a solid-state battery module, a method for assembling a solid-state battery module, and a vehicle, which can maintain the internal pressure of the solid-state battery module.

[0005] Specifically, the following technical solutions are included: In a first aspect, embodiments of this disclosure provide a solid-state battery module, including a plurality of battery cells, a plurality of first support members, a strapping strap, and two second support members, wherein the plurality of battery cells and the plurality of first support members are located between the two second support members; The plurality of battery cells and the plurality of first support members are alternately stacked to form a stack, and the two outermost battery cells are respectively adjacent to two second support members. The strapping band surrounds and presses the stack.

[0006] In some possible implementations, the solid-state battery module includes a plurality of the strapping bands, which are equally spaced around the two second supports.

[0007] In some possible implementations, the second support member has a plurality of grooves on the side away from the first support member, with each of the straps located in one of the grooves.

[0008] In some possible implementations, the stacked component is a quadrangular prism structure, and the solid-state battery module further includes an upper housing and a lower housing, the upper housing and the lower housing being located on opposite sides of the quadrangular prism structure adjacent to the second support member, at least one of the upper housing and the lower housing being U-shaped, and the upper housing being connected to the lower housing.

[0009] In some possible implementations, the upper shell is provided with a plurality of first reinforcing ribs, and the lower shell is provided with a plurality of second reinforcing ribs.

[0010] In some possible implementations, the lower housing includes a bottom plate, a first side plate, and a second side plate, wherein the first side plate and the second side plate are respectively connected to opposite sides of the bottom plate; A first bend is provided at the connection between the first side plate and the bottom plate, and / or a second bend is provided at the connection between the second side plate and the bottom plate.

[0011] In some possible implementations, the solid-state battery module further includes a first cover plate and a second cover plate, which are located at opposite ends of the quadrangular prism structure, and the first cover plate is connected to the upper housing and the lower housing, and the second cover plate is connected to the upper housing and the lower housing.

[0012] In some possible implementations, the solid-state battery module further includes a first insulating end cap and a second insulating end cap, wherein the first insulating end cap is connected to the side of the first cover plate away from the battery cell, and the second insulating end cap is connected to the side of the second cover plate away from the battery cell.

[0013] Secondly, embodiments of this disclosure provide a method for assembling a solid-state battery module, including: Multiple battery cells and multiple first supports are alternately stacked between two second supports to form a stack, and one of the battery cells is located between the outermost first support and the second support; Apply opposing preloads to the two second supports to compress the stacked components to the target size. Wrap the strapping around and press it firmly against the outside of the stack; The stacked components are encapsulated by the strapping.

[0014] Thirdly, embodiments of this disclosure provide a vehicle that includes any of the solid-state battery modules described in the first aspect above.

[0015] The beneficial effects of the technical solutions provided in this disclosure include at least the following: In the solid-state battery module provided in this embodiment, a first support member is provided between adjacent battery cells. The first support member has high compressive stress and good resilience. During the charging and discharging process of the battery cells, the first support member can effectively absorb the expansion and deformation of the battery cells, thereby buffering the stress between the battery cells and preventing damage to the stacked structure of the first support member and the battery cells due to excessive stress. The strapping tape can meet the pre-tightening force requirements during the battery cell stacking process. Using strapping tape to constrain the stacked components can effectively suppress stress release. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, 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 disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a solid-state battery module provided in an embodiment of this disclosure; Figure 2 An exploded view of some components of a solid-state battery module provided in an embodiment of this disclosure; Figure 3 An exploded view of a solid-state battery module provided in an embodiment of this disclosure; Figure 4 A partial schematic diagram of the lower housing of a solid-state battery module provided in an embodiment of this disclosure; Figure 5 A partial schematic diagram of the lower housing of a solid-state battery module provided in an embodiment of this disclosure; Figure 6 A flowchart illustrating the assembly method of a solid-state battery module provided in this embodiment.

[0018] The reference numerals in the figure are respectively: 1-Battery cell; 2-First support component; 3-Bundling strap; 4-Second support component; 5-Upper housing; 6-Lower housing; 7-First cover plate; 8-Second cover plate; 9-First insulating end cover; 10-Second insulating end cover; 11-Output pole insulating protection cover; 100 - Stacked parts; 401 - Groove; 501 - First reinforcing rib; 601 - Second reinforcing rib; 602 - Base plate; 603 - First side plate; 604 - Second side plate; 605 - First bend; 606 - Second bend.

[0019] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0020] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] Solid-state batteries, as a novel energy storage technology, use solid electrolytes instead of traditional liquid electrolytes, possessing potential for high energy density, high safety, and long cycle life, and are considered a major direction for battery technology development. With advancements in materials science, solid-state batteries have achieved significant improvements in key performance aspects such as electrolyte ionic conductivity and interface stability, and are gradually moving towards industrial applications. In related technologies, the common structural designs of solid-state battery modules largely follow or borrow from the modular schemes of liquid lithium-ion batteries, such as using multiple cells connected in series or parallel, supplemented by external supports, heat dissipation structures, and electrical connection components. These designs typically include metal or plastic frames to fix the cells and electrical connections between cells via busbars, while relying on air cooling, liquid cooling, or phase change materials for thermal management. Currently, the solid-state battery modules provided by related technologies have the following problems: Insufficient interfacial pressure maintenance in solid-state batteries. During charging and discharging, solid-state batteries require a stable and tight contact and a certain stacking pressure between the electrodes and the solid electrolyte to ensure ion transport efficiency and prevent interfacial degradation. Current solid-state battery module structures are typically not optimized for this characteristic of solid-state batteries, lacking a continuous and uniform pressure control mechanism. This leads to increased interfacial impedance and accelerated capacity decay during long-term cycling.

[0022] Low structural integration and space utilization. Traditional lithium battery modules rely on numerous structural components for fixation and connection, leading to increased overall weight and reduced volumetric energy density. For solid-state battery systems seeking high energy density, the battery module designs offered by related technologies have failed to fully leverage the potential advantages of the compact structure of solid-state batteries.

[0023] There is a conflict between electrical connection and mechanical stability. Solid-state batteries may undergo volume changes during charging and discharging, while rigid electrical connections are prone to stress concentration during cycling, causing loosening or contact failure at connection points, affecting the overall reliability and safety of the module.

[0024] Therefore, an assembly and structural design scheme for modules optimized for solid-state battery characteristics is needed to solve the aforementioned problems such as interface pressure control, thermal management matching, structural integration and connection reliability, so as to fully leverage the technical advantages of solid-state batteries and promote their large-scale application.

[0025] Therefore, this disclosure provides a solid-state battery module. Figure 1 This is a schematic diagram of a solid-state battery module provided in an embodiment of this disclosure; Figure 2 This is an exploded view of some components of a solid-state battery module provided in an embodiment of this disclosure. Figure 1-2 As shown, the solid-state battery module provided in this embodiment includes multiple battery cells 1, multiple first support members 2, strapping 3, and two second support members 4. The multiple battery cells 1 and the multiple first support members 2 are located between the two second support members 4. The multiple battery cells 1 and the multiple first support members 2 are alternately stacked to form a stack 100, and the two outermost battery cells 1 are adjacent to the two second support members 4 respectively. The strapping 3 surrounds and presses the stack 100.

[0026] In the solid-state battery module provided in this embodiment, a first support member 2 is provided between adjacent battery cells 1. The first support member 2 has high compressive stress and good resilience. During the charging and discharging process of the battery cells, the first support member 2 can effectively absorb the expansion deformation of the battery cells 1, thereby buffering the stress between the battery cells 1 and preventing damage to the stacked structure of the first support member 2 and the battery cells 1 due to excessive stress. The binding strap 3 can meet the pre-tightening force requirements during the stacking process of the battery cells 1 and the first support member 2. Using the binding strap 3 to constrain the formed stacked component 100 can effectively suppress stress release.

[0027] To make the technical solutions and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0028] See Figure 1-2 The solid-state battery module provided in this embodiment includes multiple battery cells 1, multiple first support members 2, binding straps 3, and two second support members 4. The multiple battery cells 1 and multiple first support members 2 are alternately stacked and located between the two second support members 4 to form a stack 100. Two battery cells 1 are respectively located on the outermost side of the stack 100, and two second support members 4 are respectively located on the side of the two outermost battery cells 1 away from the first support members 2. The binding straps 3 surround and press the stack 100, thereby applying sufficient preload to the stack 100.

[0029] In some embodiments of this disclosure, such as Figure 2As shown, the solid-state battery module includes multiple straps 3, which are equally spaced around two second support members 4. The straps 3 serve as the main constraint elements for fixing the stacked components 100, and their material selection must meet the requirements of high strength, low elongation, good fatigue resistance, and process adaptability. Preferably, the straps 3 can be high-strength stainless steel strips, which have extremely high tensile strength and cycle durability, effectively locking the pre-tightening force. The straps 3 can also be high-performance fiber braided strips, such as carbon fiber or aramid fiber impregnated resin strips, which have advantages such as light weight, high specific strength, and good insulation, and their flexibility is more conducive to adapting to complex bundling shapes. The material selection of the straps 3 needs to comprehensively consider the design goals of the solid-state battery module, such as weight requirements, cost, and processing equipment. The width, thickness, and locking method (such as laser welding, metal buckles, or resin curing) of the straps 3 must all match the structure of the second support members 4.

[0030] Optionally, the first support component 2 is made of a novel engineering polymer composite material with high elastic modulus and high creep resistance (such as modified polyimide, reinforced elastomer, or special foaming material) through precision molding. This material system is specially designed to possess two core characteristics: 1. Controllable compressive stress-strain curve: Under a set initial compression rate (achieving the preload requirement at a 20% compression rate), it can provide stable and durable support reaction force, providing the necessary initial preload for cell stacking. 2. Excellent resilience and fatigue life: It can elastically deform in response to the breathing effect of the cell 1, absorb expansion energy, and rebound during contraction to maintain interfacial contact, avoiding failure due to plastic deformation or fatigue fracture. The thickness, porosity, and surface texture of the first support component 2 can all be optimized according to the thermal characteristics and mechanical requirements of the cell.

[0031] For example, such as Figure 2 As shown, the solid-state battery module includes four straps 3, with equal spacing between adjacent straps 3, and each strap 3 is connected and fixed by welding.

[0032] In some embodiments of this disclosure, see Figure 2 The second support member 4 has multiple grooves 401 on the side away from the first support member 2, and each strapping 3 is located in one groove 401. The grooves 401 are used to limit the strapping 3 and prevent the strapping 3 from moving relative to the stacked members 100.

[0033] Optionally, the second support member 4 is typically made of high-strength insulating engineering rubber or plastic, such as NBR. The surface of the second support member 4 furthest from the battery cell 1 is machined with a precision-embedded groove 401. The groove 401 has multiple functions: it serves as a guide and receiving groove for the strapping tape 3, ensuring that the strapping tape 3 does not protrude from the outer surface of the second support member 4. The depth and width of the groove 401 can be determined through mechanical simulation, ensuring that the strapping pressure is evenly transmitted to the end face of the battery cell 1, avoiding stress concentration at the edge of the battery cell 1. The groove 401 can precisely match the guide head of the automated strapping equipment to achieve automated strapping process.

[0034] Figure 3 An exploded view of a solid-state battery module provided in an embodiment of this disclosure. In some embodiments of this disclosure, such as... Figure 3 As shown, the stacked component 100 has a quadrangular prism structure. The solid-state battery module also includes an upper housing 5 and a lower housing 6. The upper housing 5 and the lower housing 6 are located on opposite sides of the quadrangular prism structure adjacent to the second support member 4. At least one of the upper housing 5 and the lower housing 6 is U-shaped, and the upper housing 5 is connected to the lower housing 6. The upper housing 5 and the lower housing 6 are used to cooperate to wrap multiple battery cells 1, multiple first support members 2, strapping straps 3 and two second support members 4, and to apply appropriate pressure to the stacked component 100 therein.

[0035] In some embodiments of this disclosure, the lower housing 6 is typically made of deep-drawn or extruded aluminum alloy or stainless steel sheet to balance lightweight and strength. The internal dimensions of the lower housing 6 are precisely calculated to accommodate the stacked components 100, and necessary tolerances and thermal management space are provided between the stacked components 100 and the inner wall of the lower housing 6. The upper housing 5 is also made of a matching metal material to facilitate welding between the upper housing 5 and the lower housing 6. The edge of the upper housing 5 may be provided with a flange structure, which bends towards the lower housing 6 to form a weld with the edge area of ​​the lower housing 6.

[0036] In some embodiments of this disclosure, see Figure 3 The upper shell 5 is provided with multiple first reinforcing ribs 501, and the lower shell 6 is provided with multiple second reinforcing ribs 601. The arrangement of the first reinforcing ribs 501 and the second reinforcing ribs 601 is determined based on topology optimization of stress concentration areas of the module under conditions such as vibration, impact, and cell expansion, using finite element analysis. The first reinforcing ribs 501 and the second reinforcing ribs 601 are used to improve the bending and torsional stiffness of the upper shell 5 and the lower shell 6. The first reinforcing ribs 501 and the second reinforcing ribs 601 can work in conjunction with the weld seam to distribute the stress generated by welding and the stress generated by the internal stacked parts 100 more evenly across the entire shell plane, preventing bulging deformation in local areas of the shell. The first reinforcing ribs 501 and the second reinforcing ribs 601 can also serve as positioning and clamping structures for cooling plates or thermal pads, assisting in thermal management.

[0037] Figure 4 This is a partial schematic diagram of the lower housing 6 of a solid-state battery module provided in an embodiment of this disclosure. In some embodiments of this disclosure, such as... Figure 3-4 As shown, the lower shell 6 includes a base plate 602, a first side plate 603, and a second side plate 604. The first side plate 603 and the second side plate 604 are respectively connected to opposite sides of the base plate 602. A first bending portion 605 is provided at the connection between the first side plate 603 and the base plate 602. The first bending portion 605 designed in the transition area between the first side plate 603 and the base plate 602 is a local elastic deformation area or micro-arched structure formed by the shell stamping process. During the subsequent clamping of the upper shell 5 and the lower shell 6 by the welding fixture, when the upper shell 5 and the lower shell 6 are subjected to closing pressure, the first bending portion 605 can undergo a small amount of controllable elastic deformation, thereby compensating for the manufacturing tolerances of the upper shell 5 and the lower shell 6 and the dimensional fluctuations of the stacked parts 100. This ensures that the corresponding welding surfaces of the upper shell 5 and the lower shell 6 can achieve a tight fit along the entire circumference without gaps, fundamentally eliminating quality defects such as incomplete welding, weld penetration, or insufficient welding strength caused by local gaps.

[0038] Figure 5 This is a partial schematic diagram of the lower housing 6 of a solid-state battery module provided in an embodiment of this disclosure. In some embodiments of this disclosure, such as... Figure 3 and 5 As shown, a second bend 606 is provided at the connection between the second side plate 604 and the base plate 602. The second bend 606 designed in the transition area between the second side plate 604 and the base plate 602 is a local elastic deformation area or micro-arched structure formed by the shell stamping process. During the subsequent welding process where the upper shell 5 and the lower shell 6 are clamped, when the upper shell 5 and the lower shell 6 are subjected to closing pressure, the second bend 606 can undergo a small amount of controllable elastic deformation, thereby compensating for the manufacturing tolerances of the upper shell 5 and the lower shell 6 and the dimensional fluctuations of the stacked parts 100. This ensures that the corresponding welding surfaces of the upper shell 5 and the lower shell 6 can achieve a tight fit around the entire circumference without gaps, fundamentally eliminating quality defects such as incomplete welding, weld penetration, or insufficient welding strength caused by local gaps.

[0039] In some embodiments of this disclosure, such as Figure 3As shown, the solid-state battery module also includes a first cover plate 7 and a second cover plate 8. The first cover plate 7 and the second cover plate 8 are located at opposite ends of the quadrangular prism structure, and the first cover plate 7 is connected to the upper shell 5 and the lower shell 6, and the second cover plate 8 is connected to the upper shell 5 and the lower shell 6. The first cover plate 7 and the second cover plate 8 have the same structure and are made of a support structure of high-strength, high-flame-retardant engineering plastics (such as polyphthalamide PPA or flame-retardant polycarbonate PC). The first cover plate 7 and the second cover plate 8 integrate an electrical connection system, including a copper-aluminum composite busbar for series / parallel battery cells, the cross-section of which has been optimized by simulation to reduce internal resistance and heat generation. The first cover plate 7 and the second cover plate 8 integrate voltage and temperature acquisition harnesses (FPC or harness) and their connectors for connecting to the battery management system (BMS). The first cover plate 7 and the second cover plate 8 are designed with elastic buckles, positioning posts and screw fixing posts around their perimeter, so as to achieve quick and precise engagement and locking with the positioning holes and threaded holes at both ends of the upper housing 5 and the lower housing 6, while ensuring the reliability of the electrical connection.

[0040] In some embodiments of this disclosure, such as Figure 3 As shown, the solid-state battery module also includes a first insulating end cover 9 and a second insulating end cover 10. The first insulating end cover 9 is connected to the side of the first cover plate 7 away from the cell 1, and the second insulating end cover 10 is connected to the side of the second cover plate 8 away from the cell 1. After the first insulating end cover 9 and the second insulating end cover 10 are installed in the preset positions, the first insulating end cover 9 is fastened from the outside of the first cover plate 7, and the second insulating end cover 10 is fastened from the outside of the second cover plate 8. The first insulating end cover 9 completely covers the metal conductive part of the first cover plate 7, and the second insulating end cover 10 completely covers the metal conductive part of the second cover plate 8, achieving IPXXB or higher level of electric shock protection and providing dustproof function.

[0041] In some embodiments of this disclosure, see Figure 3 The first insulating end cap 9 is provided with an output electrode protection cover 11, which is configured to cover the positive and negative output terminals of the solid-state battery module, providing additional physical protection and insulation marking.

[0042] In summary, the solid-state battery module assembly provided in this disclosure can reliably establish and maintain the initial assembly pressure required for the cells during the manufacturing stage. During the cycle life phase, it adaptively manages the cell breathing effect, significantly reducing the rate of increase in interface contact resistance and delaying capacity decay. Throughout its lifespan, it maintains extremely high structural rigidity and integrity, effectively resisting mechanical abuse such as vibration and shock, thus improving safety and reliability. It provides a stable and flat mounting base for thermal management systems (such as integrated liquid cooling plates), ensuring good thermal contact and further guaranteeing the thermal safety of the solid-state battery module. The first support member 2 between the cells 1 is made of a novel material with high compressive stress and good resilience. During the charging and discharging process of the cells 1, the first support member 2 can effectively absorb the expansion deformation of the cells and adapt to the cell breathing effect, thereby buffering the stress between the cells 1 and preventing damage to the support structure due to excessive stress. To meet the pre-tightening force requirements during the cell stacking process, steel strapping 3 is used to constrain the stacked components 100, effectively suppressing stress release. The strapping strap 3 is located within the groove 401 of the second support member 4, which not only facilitates process operation but also ensures uniform stress distribution on the surface of the cell 1 after strapping, preventing localized stress concentration caused by the protrusion of the strapping strap 3. The bottom of the lower housing 6 is equipped with a size adjustment structure, specifically a first bending portion 605 and a second bending portion 606. After the stacked component 100 is placed into the lower housing 6, the upper housing 5 is pressed together using welding fixtures for welding. This adjustment structure ensures the flatness of the welding surface, improving welding quality and structural consistency. After welding, a first cover plate 7 and a second cover plate 8 are installed at both ends of the solid-state battery module. Electrical insulation and external protection are achieved through the first insulating end cap 9 and the second insulating end cap 10, improving the module's safety and reliability. The overall design of this solid-state battery module realizes a three-level force transmission and release path through strapping strap 3 constraint, housing reinforcing ribs, and coordinated welding area, effectively managing the internal stress of the system during charging and discharging, and ensuring the structural stability and cycle life of the module during long-term operation.

[0043] Figure 6 A flowchart illustrating the assembly method of a solid-state battery module provided in this embodiment of the disclosure. Figure 6 As shown, the assembly method provided in this disclosure can be applied to assembling any of the solid-state battery modules provided in the above embodiments. Specifically, the assembly method for the solid-state battery module includes the following steps.

[0044] Step S1: Multiple battery cells 1 and multiple first support members 2 are alternately stacked between two second support members 4 to form a stack 100, and the two outermost battery cells 1 are adjacent to the two second support members 4 respectively. Step S2: Apply opposing preloads to the two second support members 4 to compress the stacked member 100 to the target size; Step S3: Wrap the strapping 3 around and press it firmly against the outside of the stack 100; Step S4: Encapsulate the stack 100 surrounded by the strapping 3.

[0045] In the solid-state battery module assembly method provided in this embodiment, multiple battery cells 1 and multiple first support members 2 are alternately stacked. The first support members 2 have high compressive stress and good resilience. During the charging and discharging process of the battery cells, the first support members 2 can effectively absorb the expansion deformation of the battery cells 1, thereby buffering the stress between the battery cells 1 and preventing damage to the stacked structure of the first support members 2 and the battery cells 1 due to excessive stress. The binding strap 3 can meet the pre-tightening force requirements during the stacking process of the battery cells 1 and the first support members 2. Using the binding strap 3 to constrain the formed stacked components 100 can effectively suppress stress release.

[0046] Specifically, based on the number of series / parallel cells in the solid-state battery module, the selected required number of cells 1, the first support 2, and the second support 4 are arranged according to the formula: "Second support 4 - [Cell 1 - First support 2]". The N-cell 1-second support 124” sequence is arranged on a pre-stacked fixture platform. The fixture platform has a highly flat substrate and a movable side pressure plate. After the fixture is started, the side pressure plate applies a preset high-precision preload to the stack 100 until the stack 100 is compressed to the target size. This process ensures that the first support 2 between all cells 1 is uniformly compressed, thereby providing initial and uniform interface pressure to the entire stack 100.

[0047] While maintaining the tooling pressure, the automated strapping equipment accurately embeds the strapping tape 3 into the grooves 401 of the second support members 4 at both ends, completing the wrapping and securing it, for example, by laser welding. The tension of the strapping tape 3 needs to be precisely controlled to ensure that after the tooling pressure is removed, the remaining tension of the strapping tape 3 is sufficient to maintain the stability of the stacked structure and prevent loosening. After the tooling pressure is released, the resulting stack 100 becomes a self-sustaining, stable module with inherent pre-tension. The internal stress of the stack 100 is balanced by the constraint force of the strapping tape 3 and the elastic reaction force of the first support member 2.

[0048] Optionally, step S4, encapsulating the stack 100 surrounded by the strapping 3, may specifically include the following steps.

[0049] First, the lower housing 6 is placed in a dedicated welding fixture, which provides support for the bottom and sides of the lower housing 6. The fixture includes a pressure mechanism for clamping the upper housing 5 and the lower housing 6. The stacked component 100 is then smoothly lifted or moved into the inner cavity of the lower housing 6, and the upper housing 5 is placed on top, ensuring that the periphery of the upper housing 5 is aligned with the welding surface of the lower housing 6. The upper die of the welding fixture presses down, applying a specified closing force. During this process, the first bend 605 and the second bend 606 at the bottom of the lower housing 6 play a crucial role, as the micro-deformation generated by the first bend 605 and the second bend 606 ensures that the welding surfaces of the upper housing 5 and the lower housing 6 achieve full-area tight contact.

[0050] Then, high-precision welding processes such as laser welding or friction stir welding (FSW) are used to perform sealing welding along the annular welding surface at the joint of the upper shell 5 and the lower shell 6. After welding, the first reinforcing rib 501 of the upper shell 5 and the weld seam together form a high-rigidity integral frame, providing rigid secondary constraints on the internal stacked components 100. At this time, the internal stress transmission path of the solid-state battery module is: cell expansion force → first support 2 absorption / buffering + binding strap 3 constraint → second support 4 → dispersed to the entire shell, especially through the welding area of ​​the upper shell 5 and the lower shell 6, as well as the first reinforcing rib 501 and the second reinforcing rib 601 to disperse the tension of the entire shell.

[0051] After welding and cooling, the first cover plate 7 and the second cover plate 8 are respectively fastened to both ends of the solid-state battery module. The clips on the first cover plate 7 and the second cover plate 8 are aligned with the holes on the upper housing 5 and the lower housing 6 and pressed down until the first cover plate 7 and the second cover plate 8 are firmly secured to the upper housing 5 and the lower housing 6. Simultaneously, the busbars inside the first cover plate 7 and the second cover plate 8 are fixed to the terminals of the battery cell 1 by laser welding or bolts, and the data acquisition harness connectors are also inserted into place. Then, the first insulating end cap 9 and the second insulating end cap 10 are respectively installed on the outer sides of the first cover plate 7 and the second cover plate 8, and finally, the output electrode protection cover 11 is installed on the first insulating end cap 9, thus completing the insulation and physical protection of all electrical components.

[0052] The solid-state battery module assembly method provided in this disclosure implements a three-level stress transmission and release path, achieving synergistic effects at different levels within the solid-state battery module. The first level, located within the stack 100, provides microscopic / interface-level constraint. This constraint is provided by the first support member 2 and the binding straps 3. The first support member 2 directly faces the expansion of the cell 1, absorbing most of the cyclic stress through elastic deformation and maintaining uniform contact pressure between the cells 1. The binding straps 3 bind the entire stack 100 into a single unit, preventing it from unraveling and transferring some stress to the ends. The first level handles high-frequency, small-amplitude breathing strain. The second level, located within the housing structure, provides macroscopic / structural reinforcement. This constraint is provided by the upper housing 5, lower housing 6, first reinforcing rib 501, second reinforcing rib 602, and full-peripheral weld seams. The rigid upper housing 5 and lower housing 6 constitute a robust external constraint boundary. The first reinforcing rib 501 and second reinforcing rib 602 significantly enhance the housing's resistance to overall bending and localized bulging. The weld seam connects the upper shell 5 and the lower shell 6 into a single unit, providing a complete load-bearing boundary. The second level primarily addresses low-frequency, high-amplitude cumulative expansion forces and external mechanical loads (such as vibration and impact), preventing permanent deformation of the solid-state battery module. The third level is system-level stress relief, which is achieved through the combined action of the entire system, including the slight extension of the strapping 3, the continuous elasticity of the first support 2, the minor deformation of the shell structure, and the stress distribution in the welded area. The entire system within the solid-state battery module allows internal stress to be released and rebalanced through the aforementioned multi-path, recoverable deformation, avoiding excessive stress concentration at local weak points within the system.

[0053] Through this multi-stage design, encompassing both internal and external flexibility and rigidity, the solid-state battery module assembly provided in this disclosure can reliably establish and maintain the initial assembly pressure required for the cells during the manufacturing stage. During the cycle life phase, it adaptively manages the cell breathing effect, significantly reducing the rate of increase in interfacial contact resistance and delaying capacity decay. Throughout its lifespan, it maintains extremely high structural rigidity and integrity, effectively resisting mechanical abuse such as vibration and shock, improving safety and reliability. This provides a stable and flat mounting base for the vehicle's thermal management system, ensuring good thermal contact and further guaranteeing the thermal safety of the solid-state battery module.

[0054] Furthermore, this disclosure also provides a vehicle that includes any of the solid-state battery modules described in the above embodiments.

[0055] In the vehicle provided in this embodiment, a first support member 2 is provided between adjacent battery cells 1. The first support member 2 has high compressive stress and good resilience. During the charging and discharging process of the battery cells, the first support member 2 can effectively absorb the expansion deformation of the battery cells 1, thereby buffering the stress between the battery cells 1 and preventing damage to the stacked structure of the first support member 2 and the battery cells 1 due to excessive stress. The strapping 3 can meet the pre-tightening force requirements during the stacking process of the battery cells 1 and the first support member 2. Using the strapping 3 to constrain the formed stacked component 100 can effectively suppress stress release.

[0056] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes 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. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In the description of this disclosure, it should be noted that, unless otherwise expressly 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 mechanical 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 disclosure according to the specific circumstances.

[0058] In this disclosure, unless otherwise expressly 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.

[0059] In the description of this disclosure, 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this disclosure.

[0060] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this disclosure.

[0061] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A solid-state battery module, characterized in that, It includes multiple battery cells (1), multiple first support members (2), strapping (3) and two second support members (4), wherein the multiple battery cells (1) and the multiple first support members (2) are located between the two second support members (4); The plurality of battery cells (1) and the plurality of first support members (2) are stacked alternately to form a stack (100), and the two outermost battery cells (1) are adjacent to the two second support members (4) respectively, and the strapping (3) surrounds and presses the stack (100).

2. The solid-state battery module according to claim 1, characterized in that, The solid-state battery module includes multiple straps (3), which are equally spaced around the two second support members (4).

3. The solid-state battery module according to claim 2, characterized in that, The second support member (4) has a plurality of grooves (401) on the side away from the first support member (2), and each of the straps (3) is located in one of the grooves (401).

4. The solid-state battery module according to claim 1, characterized in that, The stacked component (100) is a quadrangular prism structure. The solid-state battery module also includes an upper housing (5) and a lower housing (6). The upper housing (5) and the lower housing (6) are located on opposite sides of the quadrangular prism structure adjacent to the second support member (4). At least one of the upper housing (5) and the lower housing (6) is U-shaped. The upper housing (5) is connected to the lower housing (6).

5. The solid-state battery module according to claim 4, characterized in that, The upper shell (5) is provided with a plurality of first reinforcing ribs (501), and the lower shell (6) is provided with a plurality of second reinforcing ribs (601).

6. The solid-state battery module according to claim 4, characterized in that, The lower housing (6) includes a bottom plate (602), a first side plate (603), and a second side plate (604), wherein the first side plate (603) and the second side plate (604) are respectively connected to the opposite sides of the bottom plate (602); A first bend (605) is provided at the connection between the first side plate (603) and the bottom plate (602), and / or a second bend (606) is provided at the connection between the second side plate (604) and the bottom plate (602).

7. The solid-state battery module according to claim 4, characterized in that, The solid-state battery module also includes a first cover plate (7) and a second cover plate (8). The first cover plate (7) and the second cover plate (8) are located at opposite ends of the quadrangular prism structure, and the first cover plate (7) is connected to the upper shell (5) and the lower shell (6), and the second cover plate (8) is connected to the upper shell (5) and the lower shell (6).

8. The solid-state battery module according to claim 7, characterized in that, The solid-state battery module further includes a first insulating end cap (9) and a second insulating end cap (10). The first insulating end cap (9) is connected to the side of the first cover plate (7) away from the battery cell (1), and the second insulating end cap (10) is connected to the side of the second cover plate (8) away from the battery cell (1).

9. A method for assembling a solid-state battery module, characterized in that, include: Multiple battery cells (1) and multiple first support members (2) are alternately stacked between two second support members (4) to form a stack (100), and the battery cells (1) are located between the outermost first support member (2) and the second support member (4); Apply opposing preloads to the two second support members (4) to compress the stack (100) to the target size; Wrap the strapping (3) around and press it firmly against the outside of the stack (100); The stack (100) is encapsulated by the strapping (3).

10. A vehicle, characterized in that, The vehicle includes the solid-state battery module as described in any one of claims 1 to 8.

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