Solid-state battery module and method of assembling the same, solid-state battery pack, and vehicle

Abstract

The present disclosure relates to a solid-state battery module, an assembling method thereof, a solid-state battery pack and a vehicle, and belongs to the technical field of batteries. The solid-state battery module comprises a cell module and a constraint shell assembly. The cell module comprises a plurality of cells, and the plurality of cells are sequentially stacked along a first direction. The constraint shell assembly is annular, and comprises two clamping portions and two connecting portions. The two clamping portions are respectively located at opposite ends of the cell module along the first direction, and the two connecting portions are respectively located at opposite ends of the cell module along a second direction. The first direction is perpendicular to the second direction. The solid-state battery module, the assembling method thereof, the solid-state battery pack and the vehicle can be beneficial to ensuring the close contact of the solid-solid interfaces inside the cell monomer group.

Description

Technical Field

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

[0002] In solid-state battery systems, during the repeated charge-discharge cycles of lithium-ion insertion / extraction, the active materials of the electrodes undergo significant volume changes. This can easily lead to insufficient solid-solid interface contact pressure between the positive electrode, negative electrode, and solid electrolyte, resulting in poor solid-solid interface contact within the cell. This can easily cause microscale separation and contact failure, which in turn leads to a continuous increase in battery internal resistance and rapid capacity decay. Summary of the Invention

[0003] Therefore, this disclosure provides a solid-state battery module and its assembly method, a solid-state battery pack, and a vehicle, which helps to ensure tight contact between solid-solid interfaces within the individual battery cells. The technical solution is as follows:

[0004] In a first aspect, a solid-state battery module is provided, the solid-state battery module comprising a cell module and a constraint shell assembly; The battery cell module includes multiple battery cells, which are stacked sequentially along a first direction. The constraint shell assembly is annular and includes two clamping parts and two connecting parts. The two clamping parts are located at opposite ends of the battery cell module along the first direction, and the two connecting parts are located at opposite ends of the battery cell module along the second direction. Wherein, the first direction is perpendicular to the second direction.

[0005] In some possible implementations, both of the connecting portions are provided with at least one strip groove rib, the at least one strip groove rib extending in a third direction; Furthermore, when the connecting portion is provided with multiple strip grooves, the multiple strip grooves are distributed at intervals along the first direction; Wherein, the third direction is perpendicular to both the first direction and the second direction.

[0006] In some possible implementations, the solid-state battery module further includes two cell supports; The two cell brackets are located at opposite ends of the cell module along the third direction, and each of the two cell brackets is provided with multiple slots; Both ends of the multiple battery cells are inserted into a corresponding slot at one end; Preferably, each of the battery cells has a tab assembly, and at least one of the battery cell supports is provided with an electrical connection assembly, the electrical connection assembly being electrically connected to each of the tab assemblies respectively; Preferably, the solid-state battery module further includes two insulating covers, which are located at opposite ends of the cell module along the third direction, and the insulating covers are located on the side of the cell support at the corresponding end that is away from the cell module.

[0007] In some possible implementations, the two clamping parts include a first clamping part and a second clamping part; The first clamping part is integrally formed with the two connecting parts to form a U-shaped structure; The two ends of the second clamping part along the second direction are respectively fixedly connected to the connecting part at the corresponding end; Preferably, both ends of the second clamping portion extend toward the side closer to the first clamping portion along the second direction and partially overlap with the connecting portion at the corresponding end.

[0008] In some possible implementations, the battery cell module further includes a plurality of elastic elements, which are stacked alternately with the plurality of battery cells along the first direction; Preferably, both ends of the battery cell module along the first direction are the elastic elements; And / or, A thin-film pressure sensor is disposed between the elastic element and the battery cell, and the thin-film pressure sensor is used to monitor the pressure between the elastic element and the battery cell along the first direction.

[0009] In some possible implementations, in the first direction, the hardness of the plurality of elastic elements gradually increases or decreases from the middle to both ends.

[0010] In some possible implementations, the solid-state battery module further includes two end supports, which are located at opposite ends of the cell module along the first direction, and the end supports are located between the clamping portion at one end and the cell module. Preferably, the end support has at least one cavity; Preferably, when the end support includes multiple cavities, the multiple cavities are spaced apart along the second direction, and each cavity is through along the third direction; Preferably, the end support is made of sheet metal using a bending process; And / or, Each cavity is filled with an elastic material.

[0011] In a second aspect, a method for assembling a solid-state battery module is provided. The method is used to assemble any of the solid-state battery modules described in the first aspect, and includes the following steps: Multiple cells from the solid-state battery module are stacked sequentially in a U-shaped structure. The solid-state battery module has two clamping parts, including a first clamping part and a second clamping part. The U-shaped structure is formed by connecting the two connecting parts of the solid-state battery module to the first clamping part. The second clamping part is placed over the opening of the U-shaped structure, and together with the U-shaped structure, they enclose the battery cell module; A relative force is applied to the first clamping part and the second clamping part along the first direction until the size of the cell module along the first direction reaches the set size. Then, the two ends of the second clamping part along the second direction are respectively fixedly connected to the connecting part at the corresponding end to form the constraint shell assembly of the solid-state battery module.

[0012] Thirdly, a solid-state battery pack is provided, the solid-state battery pack including any of the solid-state battery modules described in the first aspect.

[0013] Fourthly, a vehicle is provided, the vehicle including any of the solid-state battery modules described in the first aspect.

[0014] In the solution disclosed herein, since the battery cells in the battery cell module mainly expand along the first direction, the annular constraint shell assembly can withstand external vibration and impact loads, preventing permanent deformation or structural damage to the battery cell module. Simultaneously, the two connecting portions can tighten the two clamping portions along the first direction, thereby suppressing the expansion of the battery cell along the first direction during charge-discharge cycles, reducing the volume change of the battery cell, maintaining the contact pressure at the solid-solid interface inside the battery cell, and ensuring tight contact at the solid-solid interface. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of the first solid-state battery module provided in the embodiments of this disclosure; Figure 2 This is a schematic diagram of the structure of the second solid-state battery module provided in this embodiment; Figure 3 This is an exploded structural diagram of the third type of solid-state battery module provided in this embodiment; Figure 4 This is a schematic diagram of the structure of the third type of solid-state battery module provided in this embodiment; Figure 5This is an exploded structural diagram of the first solid-state battery module provided in this embodiment; Figure 6 This is a schematic diagram of the structure of the first type of end support provided in the embodiments of this disclosure; Figure 7 This is a schematic diagram of the structure of the second type of end support provided in the embodiments of this disclosure; Figure 8 This is a schematic diagram of the structure of the third type of end support provided in the embodiments of this disclosure; Figure 9 This is a schematic flowchart of an assembly method for a solid-state battery module provided in an embodiment of this disclosure.

[0017] Explanation of reference numerals in the attached figures 1. Battery cell module; 11. Battery cell; 111. Electrode assembly; 12. Elastic element; 13. Thin-film pressure sensor; 2. Constraint shell assembly; 21. Clamping part; 21a. First clamping part; 21b. Second clamping part; 22. Connecting part; 221. Strip groove rib; 3. Battery cell bracket; 31. Slot; 32. Electrical connection assembly; 33. Electrode through hole; 321. Electrode output end; 4. Insulating cover; 41. Protective cover; 5. End support; 51. Cavity. Detailed Implementation

[0018] To make the objectives, 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.

[0019] Firstly, this embodiment relates to a solid-state battery module, as shown in the reference. Figure 1 As shown, the solid-state battery module includes a cell module 1 and a constraint shell assembly 2. The cell module 1 includes multiple cells 11, which are stacked sequentially along a first direction 001. The constraint shell assembly 2 is annular and includes two clamping parts 21 and two connecting parts 22. The two clamping parts 21 are located at opposite ends of the cell module 1 along the first direction 001, and the two connecting parts 22 are located at opposite ends of the cell module 1 along a second direction 002. The first direction 001 and the second direction 002 are perpendicular.

[0020] Therefore, since the battery cell 11 in the battery cell module 1 mainly expands along the first direction 001, the annular constraint shell assembly 2 can withstand vibration and impact loads from the outside, preventing permanent deformation or structural damage to the battery cell module 1. At the same time, the two connecting parts 22 can tighten the two clamping parts 21 along the first direction 001, thereby suppressing the expansion of the battery cell 11 along the first direction 001 during the charge and discharge cycle, reducing the volume change of the battery cell 11, maintaining the contact pressure of the solid-solid interface inside the battery cell 11, and ensuring tight contact of the solid-solid interface.

[0021] During the charge and discharge cycle, the cell module 1 will undergo periodic volume expansion and contraction, which makes the structure constraining the cell module 1 prone to irreversible deformation, leading to the failure of the constraint on the cell module 1.

[0022] Therefore, in some examples, refer to Figure 2 As shown, both connecting portions 22 are provided with at least one strip-shaped rib 221. For example, the connecting portion 22 can be an aluminum alloy plate or a stainless steel plate, and the strip-shaped rib 221 can be formed on the connecting portion 22 by a stamping process. Figure 2 In the connection part 22, three strip groove ribs 221 may be provided, but in other possible examples, one strip groove rib 221, two strip groove ribs 221 or four strip groove ribs 221 may be provided, etc.

[0023] Continue to refer to Figure 2 As shown, at least one strip-shaped groove 221 extends along a third direction 003. When the connecting portion 22 is provided with multiple strip-shaped grooves 221, the multiple strip-shaped grooves 221 are distributed at intervals along the first direction 001. The third direction 003 is perpendicular to both the first direction 001 and the second direction 002.

[0024] Therefore, by setting the strip groove 221, when the cell module 1 expands along the first direction 001, the strip groove 221 can deform along the first direction 001 to tighten the connecting part 22, thereby increasing the clamping force applied by the two clamping parts 21 to the cell module 1. When the cell module 1 contracts, the strip groove 221 can restore its deformation and pull the two clamping parts 21 closer to each other to maintain the clamping force applied by the two clamping parts 21 to the cell module 1. Therefore, during the expansion and contraction of the cell 11, on the one hand, the constraint shell assembly 2 is less likely to undergo irreversible deformation, avoiding the failure of the constraint on the cell module 1; on the other hand, the structural center of the clamping part 21 is less likely to deform and generate stress concentration, ensuring that the expansion force of the cell 11 can be evenly distributed.

[0025] Meanwhile, the strip groove 221 can also improve the bending and torsional resistance of the constraint shell assembly 2 under stress, and can "tighten" the connection part 22, effectively suppressing the deformation of the solid-state battery module and maintaining the stability of the solid-state battery module shape.

[0026] In some examples, reference Figure 3 As shown, the solid-state battery module also includes two cell supports 3. The two cell supports 3 are located at opposite ends of the cell module 1 along a third direction 003, and each cell support 3 is provided with multiple slots 31. Both ends of the multiple cells 11 are inserted into a corresponding slot 31 at one end. Thus, the cell supports 3 can reliably fix each cell 11 in the cell module 1, helping to prevent misalignment caused by movement of the cells 11.

[0027] For example, the cell bracket 3 can be made of plastic materials such as polyphthalamide (PPA) or polycarbonate (PC). The two cell brackets 3 can be fixedly connected to the two clamping parts 21 and the two connecting parts 22 by means of bolts, snap-fits, etc. The slot 31 of each cell bracket 3 corresponds one-to-one with the cell 11 of the cell module 1. Both ends of each cell 11 can be respectively snapped into the corresponding slot 31 at one end.

[0028] In some examples, reference Figure 5 As shown, each battery cell 11 has a tab assembly 111, and at least one battery cell support 3 is provided with an electrical connection assembly 32, which is electrically connected to each tab assembly 111. Thus, the battery cells 11 can be connected in series or in parallel with each other through the electrical connection assembly 32, and can also be electrically connected to external electrical components.

[0029] For example, the electrical connection assembly 32 may include a bus. The bus may be fixedly mounted on the cell support 3 by means of bolts, snap-fit, or other methods. The electrode assembly 111 includes a positive electrode and a negative electrode.

[0030] When the positive and negative electrodes are located at opposite ends of the cell module 1 along the third direction 003, both cell supports 32 are equipped with electrical connection components 32, and the positive and negative electrodes can be welded or bolted to the busbar at their respective ends. When the positive and negative electrodes are located at the same end of the cell module 1 along the third direction 003, one cell support 3 is equipped with an electrical connection component 32, and both the positive and negative electrodes can be welded or bolted to the busbar. The busbar can be welded to external leads, thereby realizing the electrical connection between each cell 11 of the cell module 1 and external electrical components.

[0031] In some examples, reference Figure 3 As shown, the electrical connection assembly 32 can be installed on the side of the cell bracket 3 facing away from the cell module 1. At least one cell bracket 3 is provided with multiple tab through holes 33. The tab through holes 33 of the cell bracket 3 correspond one-to-one with the cell 11 of the cell module 1. The tab assembly 111 of the cell 11 can pass through the tab through hole 33 at the corresponding end to the corresponding side of the cell bracket 3 facing away from the cell module 1, and connect with the electrical connection assembly 32 at the corresponding end.

[0032] For example, when the positive and negative tabs are located at opposite ends of the cell module 1 along the third direction 003, both cell supports 32 are provided with multiple tab through holes 33. When the positive and negative tabs are located at the same end of the cell module 1 along the third direction 003, one cell support 3 is provided with multiple tab through holes 33. The positive and negative tabs of the cell 11 can pass through the tab through holes 33 at their respective ends to the side of the corresponding cell support 3 away from the cell module 1, and connect with the electrical connection component 32 at the corresponding end.

[0033] Thus, after the cell bracket 3 is installed at the corresponding end of the cell module 1, the electrical connection component 32 and the tab component 111 can be conveniently connected from the side of the cell bracket 3 away from the cell module 1.

[0034] In some examples, reference Figure 3 and Figure 4 As shown, the solid-state battery module also includes two insulating covers 4. The two insulating covers 4 are located at opposite ends of the cell module 1 along a third direction 003. The insulating covers 4 are located on the side of the cell support 3 facing away from the cell module 1 at the corresponding end. For example, the insulating covers 4 can be fixedly installed on the side of the cell support 3 facing away from the cell module 1 by means of snap-fit, bolts, etc.

[0035] Thus, the insulating cover 4 can cover the electrical connection assembly 32 and the tab assembly 111, achieving insulation and physical protection for the battery cell module 1, while also providing dust protection.

[0036] In some examples, reference Figure 3 As shown, when both battery cell supports 3 are equipped with electrical connection components 32, each of the two electrical connection components 32 has an electrode output terminal 321. The two electrode output terminals 321 are the positive output terminal and the negative output terminal, respectively.

[0037] When only one of the two cell supports 3 is equipped with an electrical connection component 32, the electrical connection component 32 has two electrode output terminals 321. The two electrode output terminals 321 are a positive output terminal and a negative output terminal, respectively.

[0038] Both electrode output terminals 321 can extend to the side of the insulating cover 4 away from the cell support 3, and each electrode output terminal 321 is covered with a protective cover 41. The protective cover 41 can be installed on the corresponding side of the insulating cover 4 away from the cell support 3 by means of bolts, welding, etc.

[0039] Thus, the protective cover 41 provides dedicated physical protection for the electrode output terminal 321 and serves as an insulation marker.

[0040] In some examples, reference Figure 3 and Figure 4As shown, the two clamping parts 21 include a first clamping part 21a and a second clamping part 21b. The first clamping part 21a is integrally formed with the two connecting parts 22 to form a U-shaped structure 201. For example, the U-shaped structure 201 can be integrally formed by bending an aluminum alloy plate or a stainless steel plate.

[0041] The two ends of the second clamping part 21b along the second direction 002 are respectively fixedly connected to the corresponding end of the connecting part 22. For example, the two ends of the second clamping part 21b along the second direction 002 can be welded to the corresponding end of the connecting part 22.

[0042] In this way, the battery cell module 1 can be stacked in the U-shaped structure 201, and then the second clamping part 21b can be placed over the opening of the U-shaped structure 201. Next, relative forces are applied to the first clamping part 21a and the second clamping part 21b along the first direction 001 until the size of the battery cell module 1 along the first direction 001 reaches the set size. Then, the two ends of the second clamping part 21b along the second direction 002 are respectively fixedly connected to the corresponding connecting part 22. This allows for convenient application of the required pre-tightening constraint force to the battery cell module 1 and assembly of the battery cell module 1 with the constraint shell assembly 2.

[0043] In some examples, reference Figure 4 As shown, both ends of the second clamping portion 21b extend towards the side closer to the first clamping portion 21a along the second direction 002, and partially overlap with the connecting portion 22 at the corresponding end. In this way, by fixing the overlapping portion of the second clamping portion 21b to the connecting portion 22, the stability of the connection between the two connecting portions 22 and the second clamping portion 21b can be improved, thereby improving the stability of the constraint on the battery cell module 1.

[0044] Under rigid constraints, the battery cell module 1 undergoes repeated volume changes due to charge-discharge cycles, which easily leads to stress concentration. Therefore, in some examples, reference... Figure 5 As shown, the battery cell module 1 also includes multiple elastic elements 12, which are alternately stacked with multiple battery cells 11 along the first direction 001. In this way, the elastic elements 12 can absorb most of the cyclic stress through elastic deformation, thereby maintaining a uniform contact pressure between the battery cells 11 and helping to alleviate stress concentration problems. The elastic elements 12 can be sheet-like and can be engineering polymer composite materials with high elastic modulus and high creep resistance, such as modified polyimide, reinforced elastomer, or special foaming materials.

[0045] In some examples, both ends of the battery cell module 1 along the first direction 001 are elastic members 12. This avoids direct contact between the surface of the battery cell 11 along the first direction 001 and the high-hardness constraint shell assembly 2, which helps to prevent damage to the battery cell 11.

[0046] In some examples, reference Figure 5 As shown, a thin-film pressure sensor 13 is disposed between the elastic element 12 and the battery cell 11. The thin-film pressure sensor 13 is used to monitor the pressure between the elastic element 12 and the battery cell 11 along the first direction 001. For example, the thin-film pressure sensor 13 can be integrated on a flexible circuit board and fixed to one end surface of the elastic element 12 or the battery cell 11 along the first direction 001 by adhesive bonding.

[0047] During the production stage of solid-state battery modules, the thin-film pressure sensor 13 can record the initial pressure inside the solid-state battery module, which helps to ensure the product quality and consistency of the solid-state battery module.

[0048] During the operation of the solid-state battery module after it is installed in the vehicle, by setting a pressure threshold, when the pressure value detected by the thin-film pressure sensor 13 exceeds the pressure threshold, an early warning can be issued to the user, indicating that the solid-state battery module may be in an abnormal expansion force or at the end of its life, thereby improving the safety of the solid-state battery module operation.

[0049] In some examples, along the first direction 001, the hardness of the multiple elastic elements 12 gradually increases or decreases from the middle to both ends. For example, the multiple elastic elements 12 can be made of different materials from the middle to both ends to achieve different hardnesses. In this way, when the battery cell module 1 expands, the parts of each elastic element 12 with lower hardness can strain before the parts with higher hardness, thereby achieving gradual stress release, improving the stress release effect, and mitigating the stress concentration problem.

[0050] In some examples, reference Figure 1 As shown, the solid-state battery module also includes two end supports 5. The two end supports 5 are located at opposite ends of the cell module 1 along the first direction 001, and the end supports 5 are located between the clamping part 21 at the corresponding end and the cell module 1. For example, the end supports 5 can be metal plates.

[0051] On the one hand, the two end supports 5 can support the battery cell module 1 at opposite ends along the first direction 001, maintaining the stability of the structural dimensions of the battery cell module 1 and preventing the battery cell 11 from being excessively squeezed or loosened. On the other hand, when welding the clamping part 21 and the connecting part 22, the end supports 5 can also provide support along the second direction 002, preventing damage to the battery cell 11 during welding.

[0052] In some examples, reference Figures 6 to 8 As shown, the end support 5 has at least one cavity 51. For example, the end support 5 may have one cavity 51, two cavities 51, or three cavities 51, etc. This can reduce the weight of the end support 5.

[0053] In some examples, referring to Figure 7 and Figure 8 As shown, when the end support 5 includes a plurality of cavities 51, the plurality of cavities 51 are spaced apart along the second direction 002, and each cavity 51 penetrates along the third direction 003. Among them, adjacent cavities 51 can be separated by ribs. Thus, while reducing the weight of the end support 5, it has sufficient structural strength.

[0054] In some examples, referring to Figure 7 and Figure 8 As shown, the end support 5 is obtained by bending a sheet material. For example, the end support 5 can be bent from a sheet material into a plate member with a "day" - shaped cross - section or a plate member with an "eye" - shaped cross - section, etc. In this way, it is beneficial to reduce the manufacturing difficulty of the end support 5 and at the same time improve the structural strength of the end support 5.

[0055] In some examples, each cavity 51 is filled with an elastic material. For example, each cavity 51 can be filled with silica gel or rubber, etc. Thus, the elastic material can not only ensure the uniform divergence of the expansion force of the battery cell 11, avoid the deformation of the cavity 51 and the generation of stress concentration, but also enable the end support 5 to have a small amount of elastic deformation ability, which is beneficial to uniformly transfer the expansion force of the battery cell module 1 to the constraint shell assembly 2 and relieve the stress release inside the battery cell 11.

[0056] In the embodiments of the present disclosure, since the battery cells 11 in the battery cell module 1 mainly expand along the first direction 001, and the annular constraint shell assembly 2 can withstand external vibration and impact loads, preventing the battery cell module 1 from undergoing permanent deformation or structural damage. At the same time, the two connecting parts 22 can tighten the two clamping parts 21 along the first direction 001, so that during the charge - discharge cycle, the expansion of the battery cell 11 along the first direction 001 can be inhibited, the volume change of the battery cell 11 can be reduced, the contact pressure at the solid - solid interface inside the battery cell 11 can be maintained, and the tight contact at the solid - solid interface can be ensured.

[0057] In the second aspect, referring to Figure 9 as shown, the present embodiment further provides an assembly method for a solid - state battery module. The assembly method is used to assemble the solid - state battery module according to any one of the first aspect, and includes the following steps: The first step 101 includes: sequentially stacking a plurality of battery cells 11 in the battery cell module 1 of the solid - state battery module in the U - shaped structure 201. Among them, the two clamping parts 21 of the solid - state battery module include a first clamping part 21a and a second clamping part 21b, and the U - shaped structure 201 is formed by connecting the two connecting parts 22 of the solid - state battery module with the first clamping part 21a. For example, the U - shaped structure 201 can be integrally formed by the two connecting parts 22 and the first clamping part 21a.

[0058] The second step 102 includes: covering the opening of the U-shaped structure 201 with the second clamping part 21b, so that the U-shaped structure 201 together encloses the battery cell module 1.

[0059] When the solid-state battery module also includes two end supports 5, one end support 5 can be placed inside the U-shaped structure 201 first, and then multiple cells 11 from the cell module 1 of the solid-state battery module can be stacked sequentially in the U-shaped structure 201. After placing the other end support 5 on the cell module 1, the second clamping part 21b is then placed over the opening of the U-shaped structure 201, together with the U-shaped structure 201, enclosing the two end supports 5 and the cell module 1.

[0060] The third step 103 includes: applying relative forces to the first clamping part 21a and the second clamping part 21b along the first direction 001 until the size of the cell module 1 along the first direction 001 reaches the set size; then fixing the two ends of the second clamping part 21b along the second direction 002 to the corresponding end connecting part 22 to form the constraint shell assembly 2 of the solid-state battery module. For example, after the size of the cell module 1 along the first direction 001 reaches the set size, the two ends of the second clamping part 21b along the second direction 002 are welded together to the corresponding end connecting part 22.

[0061] The assembly method of this embodiment allows for convenient application of the required pre-tightening constraint force to the cell module 1 and assembly of the cell module 1 with the constraint shell assembly 2. Furthermore, in the resulting solid-state battery module, since the cell 11 in the cell module 1 primarily expands along the first direction 001, the annular constraint shell assembly 2 can withstand external vibration and impact loads, preventing permanent deformation or structural damage to the cell module 1. Simultaneously, the two connecting portions 22 can tighten the two clamping portions 21 along the first direction 001, thereby suppressing the expansion of the cell 11 along the first direction 001 during charge-discharge cycles, reducing the volume change of the cell 11, maintaining the contact pressure at the solid-solid interface inside the cell 11, and ensuring tight contact at the solid-solid interface.

[0062] In some examples, reference Figure 9 As shown, when the solid-state battery module also includes a cell support 3, the assembly method further includes: a fourth step 104, which includes: installing the cell support 3 at both ends of the cell module 1 along a third direction 003, and welding the electrical connection assembly 32 to each tab assembly 111 respectively. Thus, the installation of the cell support 3 and the electrical connection between the electrical connection assembly 32 and each tab assembly 111 can be achieved.

[0063] In some examples, reference Figure 9As shown, when the solid-state battery module also includes an insulating cover 4, the assembly method further includes: a fifth step 105, which includes: installing the insulating cover 4 at the ends of the two cell supports 3 opposite to the cell module 1 along a third direction 003. This enables the installation of the insulating cover 4.

[0064] Thirdly, a solid-state battery pack is provided, which includes any of the solid-state battery modules in the first aspect.

[0065] In this embodiment, since the battery cell 11 in the battery cell module 1 mainly expands along the first direction 001, the annular constraint shell assembly 2 can withstand external vibration and impact loads, preventing permanent deformation or structural damage to the battery cell module 1. Simultaneously, the two connecting portions 22 can tighten the two clamping portions 21 along the first direction 001, thereby suppressing the expansion of the battery cell 11 along the first direction 001 during charge-discharge cycles, reducing the volume change of the battery cell 11, maintaining the contact pressure at the solid-solid interface inside the battery cell 11, and ensuring tight contact at the solid-solid interface.

[0066] Fourthly, a vehicle is provided, the vehicle including any of the solid-state battery modules of the first aspect.

[0067] In this embodiment, since the battery cell 11 in the battery cell module 1 mainly expands along the first direction 001, the annular constraint shell assembly 2 can withstand external vibration and impact loads, preventing permanent deformation or structural damage to the battery cell module 1. Simultaneously, the two connecting portions 22 can tighten the two clamping portions 21 along the first direction 001, thereby suppressing the expansion of the battery cell 11 along the first direction 001 during charge-discharge cycles, reducing the volume change of the battery cell 11, maintaining the contact pressure at the solid-solid interface inside the battery cell 11, and ensuring tight contact at the solid-solid interface.

[0068] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 application according to the specific circumstances.

[0069] 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. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0070] 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 application.

[0071] The above are merely embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A solid-state battery module, characterized in that, The solid-state battery module includes a cell module (1) and a constraint shell assembly (2). The battery module (1) includes a plurality of battery cells (11), which are stacked sequentially along a first direction (001); The constraint shell assembly (2) is annular, and the constraint shell assembly (2) includes two clamping parts (21) and two connecting parts (22). The two clamping parts (21) are located at opposite ends of the battery cell module (1) along the first direction (001), and the two connecting parts (22) are located at opposite ends of the battery cell module (1) along the second direction (002). Wherein, the first direction (001) is perpendicular to the second direction (002).

2. The solid-state battery module according to claim 1, characterized in that, Both of the connecting portions (22) are provided with at least one strip groove rib (221), which extends along a third direction (003); Furthermore, when the connecting part (22) is provided with a plurality of strip grooves (221), the plurality of strip grooves (221) are distributed at intervals along the first direction (001); The third direction (003) is perpendicular to both the first direction (001) and the second direction (002).

3. The solid-state battery module according to claim 1 or 2, characterized in that, The solid-state battery module also includes two cell supports (3). The two cell brackets (3) are located at opposite ends of the cell module (1) along the third direction (003), and both cell brackets (3) are provided with multiple slots (31). Both ends of the plurality of said battery cells (11) are inserted into a corresponding slot (31) at one end; Preferably, each of the battery cells (11) has a tab assembly (111), and at least one of the battery cell supports (3) is provided with an electrical connection assembly (32), which is electrically connected to each of the tab assemblies (111); Preferably, the solid-state battery module further includes two insulating covers (4), which are located at opposite ends of the cell module (1) along the third direction (003), and the insulating cover (4) is located on the side of the cell support (3) at the corresponding end that is away from the cell module (1).

4. The solid-state battery module according to claim 1 or 2, characterized in that, The two clamping parts (21) include a first clamping part (21a) and a second clamping part (21b); The first clamping part (21a) is integrally formed with the two connecting parts (22) to form a U-shaped structure (201). The two ends of the second clamping part (21b) along the second direction (002) are respectively fixedly connected to the connecting part (22) at the corresponding end; Preferably, both ends of the second clamping part (21b) along the second direction (002) extend toward the side closer to the first clamping part (21a) and partially overlap with the connecting part (22) at the corresponding end.

5. The solid-state battery module according to claim 1, characterized in that, The battery cell module (1) also includes a plurality of elastic elements (12), which are stacked alternately with the plurality of battery cells (11) along the first direction (001); Preferably, both ends of the battery cell module (1) along the first direction (001) are the elastic elements (12). And / or, A thin-film pressure sensor (13) is provided between the elastic element (12) and the battery cell (11). The thin-film pressure sensor (13) is used to monitor the pressure between the elastic element (12) and the battery cell (11) along the first direction (001).

6. The solid-state battery module according to claim 5, characterized in that, In the first direction (001), the hardness of the plurality of elastic elements (12) gradually increases or decreases from the middle to both ends.

7. The solid-state battery module according to any one of claims 1 to 6, characterized in that, The solid-state battery module also includes two end supports (5), which are located at opposite ends of the cell module (1) along the first direction (001), and the end supports (5) are located between the clamping part (21) at one end and the cell module (1). Preferably, the end support (5) has at least one cavity (51); Preferably, when the end support (5) includes a plurality of cavities (51), the plurality of cavities (51) are spaced apart along the second direction (002), and each of the cavities (51) is through along the third direction (003); Preferably, the end support (5) is obtained by bending a sheet metal. And / or, Each cavity (51) is filled with elastic material.

8. A method for assembling a solid-state battery module, characterized in that, The assembly method is used to assemble the solid-state battery module according to any one of claims 1 to 7, and includes the following steps: Multiple cells (11) in the cell module (1) of the solid-state battery module are stacked sequentially in a U-shaped structure (201). The two clamping parts (21) of the solid-state battery module include a first clamping part (21a) and a second clamping part (21b). The U-shaped structure (201) is formed by connecting the two connecting parts (22) of the solid-state battery module to the first clamping part (21a). The second clamping part (21b) is placed over the opening of the U-shaped structure (201) and together with the U-shaped structure (201) encloses the battery cell module (1). Apply relative forces to the first clamping part (21a) and the second clamping part (21b) along the first direction (001) until the size of the cell module (1) along the first direction (001) reaches the set size. Then, fix the two ends of the second clamping part (21b) along the second direction (002) to the corresponding connecting part (22) to form the constraint shell assembly (2) of the solid-state battery module.

9. A solid-state battery pack, characterized in that, The solid-state battery pack includes the solid-state battery module as described in any one of claims 1 to 7.

10. A vehicle, characterized in that, The vehicle includes the solid-state battery module as described in any one of claims 1 to 7.

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