Assembling method of battery pack and battery pack

Abstract

The invention provides an assembly method of a battery pack and the battery pack, and particularly relates to the technical field of batteries. The assembly method of the battery pack comprises the following steps: providing the battery cell units and the battery box body; fixedly connecting the battery cell units to form battery cell assemblies, and arranging buffer pieces between the battery cell assemblies to fixedly connect the battery cell assemblies; placing the connected battery cell components in a shell to form a battery cell module; stacking the plurality of battery cell modules to form a battery module, and extruding the battery module to a specified size; arranging an integrated plate on one side of the extruded battery module, and electrically connecting the battery cell units in the battery module through the integrated plate; and assembling the battery module in the battery box body. Therefore, the battery cell units are connected to form the battery cell assembly, then the battery cell units are connected to form the battery cell module, the battery cell module is stacked to form the battery module, the battery module is extruded, and finally the whole battery pack is placed in the battery box body, so that the battery pack is firm in structure and can bear relatively large expansion force of a solid-state battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack assembly method and a battery pack. Background Art

[0002] With technological advancements and increasing demand for renewable energy, power batteries have been widely used in many fields, including electric vehicles, renewable energy storage, consumer electronics, and industrial equipment. Among them, battery packs, as the core components of power battery systems, are currently the main method of integrating power batteries.

[0003] Among them, the battery pack can meet the power requirements of the entire vehicle by connecting multiple battery modules in series or in parallel. In solid-state batteries, the various components within the battery module need to maintain good interface contact to ensure the effective operation and performance of the power battery. These components usually include a solid electrolyte, a positive electrode, and a negative electrode (such as a metal anode). Because the anode material may undergo volume changes during the battery charging and discharging process, especially when a metal anode is used (for example, lithium metal in a lithium-ion battery will expand and contract during charging and discharging), it may lead to poor interface contact and affect the performance of the power battery.

[0004] To maintain interfacial contact between components within the battery module and compensate for changes in the metal anode volume, stack pressure is typically applied within a certain range to help maintain close contact between the component interfaces. However, in existing battery packs, conventional battery pack structures are generally unable to withstand the extrusion force of the battery module. Additionally, existing battery pack structures are relatively simple and cannot adapt to different types of battery modules, and the versatility of battery packs needs to be improved. Summary of the Invention

[0005] The present application provides a battery pack assembly method and a battery pack. By connecting battery cell units into battery cell assemblies, which are then connected into battery cell modules, which are then stacked into a battery module, and the battery modules are compressed and finally placed as a whole in a battery case, the battery pack structure is made strong and can withstand the large expansion force of solid-state batteries.

[0006] A first aspect of the present application provides a battery pack assembly method, the assembly method comprising:

[0007] Provide battery cell units and battery boxes;

[0008] The battery cells are fixedly connected to form a battery assembly, and buffers are provided between the battery assemblies to securely connect the battery assemblies;

[0009] Placing the connected battery cell assembly in the housing to form a battery cell module;

[0010] Stack multiple battery cell modules to form a battery module, and extrude the battery module to a specified size;

[0011] An integrated board is provided on one side of the extruded battery module, and the integrated board is used to electrically connect the various battery cells in the battery module;

[0012] Assemble the battery module into the battery box.

[0013] The assembly method of the battery pack provided in the first aspect of the present application includes providing battery cell units and a battery case; fixing the battery cell units to form a battery cell assembly, and providing a buffer between the battery cell assemblies to fix the battery cell assemblies; placing the connected battery cell assemblies in a shell to form a battery cell module; stacking multiple battery cell modules to form a battery module, and extruding the battery module to a specified size; providing an integrated board on one side of the extruded battery module, and electrically connecting the individual battery cell units in the battery module through the integrated board; assembling the battery module in the battery case. In this way, the assembly method of the battery pack provided in the present application connects the battery cell units into battery cell assemblies, and then connects them into battery cell modules, and then stacks them into battery modules, and extrudes the battery modules, and finally places the entire assembly in the battery case, so that the battery pack structure is firm and can withstand the large expansion force of the solid-state battery.

[0014] In one possible embodiment, a battery cell unit and a battery box are provided, comprising:

[0015] A plurality of battery cell units and a battery box with an installation cavity are provided.

[0016] In one possible embodiment, the battery cell units are fixedly connected to form a battery cell assembly, including:

[0017] The tabs of each two battery cell units are fixedly connected by welding to form a battery cell assembly;

[0018] A buffer is provided between the battery cell assemblies to securely connect the battery cell assemblies, including:

[0019] Buffer foam is arranged between the battery cell components so that every two battery cell components are bonded and connected through the buffer foam.

[0020] In a possible embodiment, after placing the connected battery cell assembly in a housing to form a battery cell module, the method further includes:

[0021] The tabs of the battery cell components in the battery cell module are electrically connected through connectors.

[0022] In one possible embodiment, after stacking multiple battery cell modules to form a battery module and extruding the battery module to a specified size, the process further includes:

[0023] The strap is fixed to the squeezed battery module to restrain the battery module.

[0024] In a possible embodiment, an integrated board is provided on one side of the extruded battery module, and the integrated board is used to electrically connect the battery cells in the battery module, further comprising:

[0025] The unconnected tabs of each cell unit in the battery module are pressed onto the pole pieces of the integrated board and electrically connected by welding.

[0026] A second aspect of the present application provides a battery pack, comprising:

[0027] Several battery modules;

[0028] A battery box, wherein a plurality of battery modules are located;

[0029] Box beam assembly, with several battery modules arranged between the box beam assemblies;

[0030] The integrated board is located on one side of the battery module and is fixedly connected to the tab of the battery module.

[0031] The battery pack provided in the second aspect of the present application includes a number of battery modules, a battery case, a box beam assembly, and an integrated board. Among them, a number of battery modules are located in the battery case, and a number of battery modules are arranged between the box beam assemblies. The integrated board is located on one side of the battery module and is fixedly connected to the tab of the battery module. In this way, the battery pack provided by the present application has a simple structure, can solve the problem of solid-state batteries being difficult to put into the box, and can adjust the box beam assembly according to battery modules of different sizes, and has good versatility.

[0032] In one possible embodiment, each battery module has a plurality of battery cell units, and the plurality of battery cell units are stacked in a first direction;

[0033] Each battery cell unit has tabs at both ends in the second direction, and the tabs of every two adjacent battery cell units in the second direction are electrically connected to form a battery cell assembly.

[0034] In a possible embodiment, a spacer is provided on one side of the battery cell assembly in the first direction;

[0035] A shell is provided on the other side of the battery cell assembly in the first direction. The shell has an opening, and the battery cell assembly is arranged in the shell through the opening.

[0036] In a possible embodiment, the integrated board is provided with a plurality of grooves arranged along the first direction, the grooves are provided with pole pieces, and through holes are provided at positions corresponding to the pole pieces and the tabs, so that the tabs are passed through the through holes and pressed onto the pole pieces.

[0037] It should be understood that the second aspect of this application corresponds to the technical solution of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here.

[0038] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, the assembly method of a battery pack provided by the present application, and other technical problems that can be solved by the battery pack, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are only part of the embodiments of the present application. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 A schematic flow chart of a battery pack assembly method according to an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application;

[0042] Figure 3 A schematic structural diagram of a cell assembly of a battery pack provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application with a spacer fixed to the battery cell assembly;

[0044] Figure 5 A schematic structural diagram of a cell module of a battery pack provided in an embodiment of the present application;

[0045] Figure 6 A schematic structural diagram of an I-shaped housing of a battery pack provided in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of the structure of the connector of the battery pack provided in an embodiment of the present application;

[0047] Figure 8 A schematic structural diagram of a battery module of a battery pack provided in an embodiment of the present application;

[0048] Figure 9 A schematic diagram of the structure of the battery pack strap and battery module provided in an embodiment of the present application;

[0049] Figure 10 A schematic diagram of the structure of the integrated board and battery module of the battery pack provided in an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 100-battery pack;

[0052] 200-battery box; 210-installation cavity; 220-module cavity;

[0053] 300 - battery module; 310 - battery cell unit; 311 - tab; 311a - first tab; 311b - second tab; 320 - battery cell assembly; 321 - spacer; 322 - housing; 3221 - opening; 3222 - first side wall; 3223 - second side wall; 330 - battery cell module; 340 - connector;

[0054] 400-box beam assembly; 410-box cross beam; 420-box longitudinal beam; 430-box convex beam;

[0055] 500- straps;

[0056] 600-integrated board; 610-groove; 620-pole piece; 621-through hole. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] As described in the background art, conventional battery pack structures are often unable to withstand the extrusion force of battery modules. Furthermore, existing battery pack structures are relatively simple and cannot accommodate different types of battery modules, leaving room for improvement in the versatility of battery packs.

[0059] In response to the above technical problems, the first aspect of the embodiment of the present application provides a method for assembling a battery pack. The assembly method of the battery pack includes providing battery cell units and a battery case; fixing the battery cell units to form a battery cell assembly, and providing a buffer between the battery cell assemblies to fix the battery cell assemblies; placing the connected battery cell assemblies in a shell to form a battery cell module; stacking multiple battery cell modules to form a battery module, and extruding the battery module to a specified size; providing an integrated board on one side of the extruded battery module, and electrically connecting the individual battery cell units in the battery module through the integrated board; assembling the battery module in the battery case. In this way, the assembly method of the battery pack provided in the embodiment of the present application connects the battery cell units into battery cell assemblies, and then connects them into battery cell modules, and then stacks them into battery modules, and extrudes the battery modules, and finally places the entire assembly in the battery case, so that the battery pack structure is firm and can withstand the large expansion force of the solid-state battery.

[0060] The second aspect of the embodiment of the present application provides a battery pack. The battery pack includes a plurality of battery modules, a battery case, a box beam assembly, and an integrated board. Among them, a plurality of battery modules are located in the battery case, and a plurality of battery modules are arranged between the box beam assemblies. The integrated board is located on one side of the battery module and is fixedly connected to the tab of the battery module. In this way, the battery pack provided by the embodiment of the present application has a simple structure, can solve the problem that solid-state batteries are difficult to put into the box, and can adjust the box beam assembly according to battery modules of different sizes, and has good versatility.

[0061] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0062] The present invention provides a battery pack assembly method and a battery pack. By connecting cell units into cell assemblies, which are then connected into cell modules, which are then stacked into a battery module, and then extruding the battery module, the entire assembly is placed in a battery case. This ensures a strong battery pack structure capable of withstanding the significant expansion forces of solid-state batteries. The following, in conjunction with the accompanying drawings, describes a battery pack assembly method and the specific structure of a battery pack provided by the present invention.

[0063] refer to Figure 1In a first aspect, an embodiment of the present application provides an assembly method for a battery pack 100. The assembly method for the battery pack 100 may include providing a battery cell unit 310 and a battery case 200; fixing the battery cell units 310 to form a battery cell assembly 320, and providing a buffer between the battery cell assemblies 320 to fix the battery cell assemblies 320; placing the connected battery cell assemblies 320 in a housing 322 to form a battery cell module 330; stacking a plurality of battery cell modules 330 to form a battery module 300, and extruding the battery module 300 to a specified size; providing an integrated board 600 on one side of the extruded battery module 300, and electrically connecting the individual battery cell units 310 in the battery module 300 through the integrated board 600; and assembling the battery module 300 in the battery case 200.

[0064] Figure 1 A schematic diagram of a process for assembling a battery pack 100 according to an embodiment of the present application is provided. Figure 1 As shown, an embodiment of the present application provides a method for assembling a battery pack 100, comprising:

[0065] S101 , providing a battery cell unit 310 and a battery box 200 .

[0066] In the embodiments of this application, Figure 2 As shown, providing a battery cell unit 310 may include providing a plurality of battery cell units 310. The embodiment of the present application does not limit the number of battery cell units 310. Alternatively, providing a battery case 200 may include providing a battery case 200 having a mounting cavity 210. In one possible embodiment, the battery case 200 may be a rectangular structure, and the embodiment of the present application does not limit the shape of the battery case 200. It is understood that a plurality of battery cell units 310 may be located in the mounting cavity 210 of the battery case 200.

[0067] S102 , the battery cell units 310 are fixedly connected to form battery cell assemblies 320 , and buffers are provided between the battery cell assemblies 320 to securely connect the battery cell assemblies 320 .

[0068] In the embodiments of this application, Figure 3 As shown, fixing the battery cell units 310 to form the battery cell assembly 320 may include: fixing the tabs 311 of each two battery cell units 310 together by welding to form a battery cell assembly 320. In the embodiment of the present application, two battery cell units 310 are used as an example. The two battery cell units 310 can be placed flat on a welding tool, and two adjacent tabs 311 of the two battery cell units 310 are welded together to fix the two battery cell units 310 together.

[0069] Providing a buffer between the battery cell assemblies 320 to securely connect the battery cell assemblies 320 may include providing a buffer foam between the battery cell assemblies 320 so that each two battery cell assemblies 320 are bonded together via the buffer foam. In the present embodiment, two battery cell assemblies 320 are used as an example. It is understood that the buffer foam may be provided between the two battery cell assemblies 320, and the buffer foam may have adhesive properties. In this manner, the two battery cell assemblies 320 may be bonded together via the buffer foam, thereby securing the two battery cell assemblies 320 to each other.

[0070] like Figure 4 As shown, after the two battery cell assemblies 320 are fixedly connected, a spacer 321 can be provided on one side of the connected battery cell assemblies 320. In this embodiment of the present application, the spacer 321 has adhesive properties. In this way, the spacer 321 can cover and fix the two battery cell assemblies 320.

[0071] S103 , placing the connected cell assembly 320 in the housing 322 to form a cell module 330 .

[0072] In the embodiments of this application, Figure 5 As shown, the connected cell assembly 320 is placed in the shell 322 to form a cell module 330. The shell 322 may include a C-shaped shell and an I-shaped shell. In one possible embodiment, one side of the C-shaped shell may have an opening 3221 for placing the cell assembly 320, so that the cell assembly 320 can be placed in the shell 322 along the opening 3221. In another possible embodiment, as shown in FIG. Figure 6 As shown, both sides of the I-shaped housing may have openings 3221 for placing the cell assemblies 320 , so that two cell assemblies 320 can be placed in the housing 322 along the openings 3221 .

[0073] In the embodiment of the present application, after the connected cell assembly 320 is placed in the housing 322 to form the cell module 330, the following steps may be further performed: the tabs 311 of the cell assembly 320 in the cell module 330 are electrically connected through the connector 340. The two cell assemblies 320 in the cell module 330 each have a tab 311 connected by welding, and the two tabs 311 may be arranged in parallel. Figure 7 As shown, by providing a connector 340 between the two tabs 311 , the two tabs 311 can be electrically connected.

[0074] S104 , stacking a plurality of battery cell modules 330 to form a battery module 300 , and extruding the battery module 300 to a specified size.

[0075] In the embodiments of this application, Figure 8As shown, stacking multiple battery cell modules 330 to form a battery module 300 and squeezing the battery module 300 to a specified size may include: stacking several battery cell modules 330 to form a battery module 300, and then squeezing the battery module 300 through a hydraulic stacking device, thereby squeezing the battery module 300 to a specified size.

[0076] In the embodiment of the present application, after stacking a plurality of battery cell modules 330 to form a battery module 300 and extruding the battery module 300 to a specified size, the following steps may be further performed: fixing a strap 500 to the extruded battery module 300 to restrain the battery module 300. Figure 9 As shown, the battery pack 100 has several beams, which are arranged one above the other to form an internal space for the battery module 300. The battery module 300 is placed between the beams so that it contacts the beams, and then the binding strap 500 is placed around the battery module 300 and the beams to secure and restrain the battery module 300.

[0077] S105 , an integrated board 600 is provided on one side of the extruded battery module 300 , and the integrated board 600 is used to electrically connect the battery cell units 310 in the battery module 300 .

[0078] In the embodiments of this application, Figure 10 As shown, an integrated board 600 is provided on one side of the extruded battery module 300, and the integrated board 600 is used to electrically connect the various battery cells 310 in the battery module 300. The process may also include: pressing the unconnected tabs 311 of the various battery cells 310 in the battery module 300 onto the pole pieces 620 of the integrated board 600, and electrically connecting them by welding. The extruded battery module 300 can be transferred to a welding fixture via a suction cup, and an integrated board 600 is provided on one side of the battery module 300. The integrated board 600 has a plurality of pole pieces 620, each of which is provided corresponding to an unconnected tab 311 in each battery cell 310 in the battery module 300, so that the tab 311 can be passed through and pressed onto the pole piece 620, and then the tab 311 and the pole piece 620 are welded to achieve electrical connection between the tab 311 and the pole piece 620.

[0079] S106 , assembling the battery module 300 into the battery box 200 .

[0080] In the embodiments of this application, Figure 2As shown, the battery module 300 is assembled in the battery case 200. Several beams and the battery module 300 are integrally located in the battery case 200. The beams can divide the mounting cavity 210 of the battery case 200 into several module cavities 220 for placing the battery modules 300. Each battery module 300 is disposed in a module cavity 220. The beams are connected to the battery case 200 with bolts, thereby completing the assembly of the battery pack 100.

[0081] It can be understood that the assembly method of the battery pack 100 provided in the embodiment of the present application is to connect the battery cell units 310 into battery cell assemblies 320, and then connect them into battery cell modules 330, and then stack them into a battery module 300, and squeeze the battery module 300, and finally place the whole in the battery case 200, so that the battery pack 100 has a firm structure and can withstand the large expansion force of the solid-state battery.

[0082] Based on the above-mentioned assembly method of a battery pack 100, the embodiment of the present application provides a battery pack 100 in the second aspect, referring to Figure 2 , the battery pack 100 may include a battery module 300, a battery case 200, a box beam assembly 400 and an integrated board 600. In one possible embodiment, the number of battery modules 300 may be several, and the embodiment of the present application is not limited here. In the embodiment of the present application, several battery modules 300 may be located in the battery case 200, and several battery modules 300 may be arranged between the box beam assemblies 400. The integrated board 600 may be located on one side of the battery module 300 and fixedly connected to the tab 311 of the battery module 300.

[0083] It can be understood that the battery pack 100 provided in the embodiment of the present application has a simple structure, can solve the problem that solid-state batteries are difficult to put into the box, and can adjust the box beam assembly 400 according to battery modules 300 of different sizes, and has good versatility.

[0084] Continue to refer Figure 2 On the basis of the above embodiment, each battery module 300 has a battery cell unit 310. In one possible embodiment, the number of battery cell units 310 can be several, and the embodiment of the present application is not limited thereto. In the embodiment of the present application, several battery cell units 310 can be stacked in the first direction. In addition, as Figure 3 As shown, each battery cell unit 310 may have tabs 311 at both ends in the second direction. The tabs 311 of every two adjacent battery cell units 310 in the second direction may be electrically connected.

[0085] It should be noted that, for the convenience of description, in the embodiment of the present application, the first direction may be the thickness direction of the battery cell unit 310, that is, Figure 3 The second direction may be the length direction of the battery cell unit 310, i.e. Figure 3 The third direction may be the height direction of the battery cell unit 310, i.e. Figure 3 It can be understood that the first direction, the second direction and the third direction are perpendicular to each other.

[0086] Continue to refer Figure 3 Based on the above embodiment, in one possible implementation, in the second direction, the battery cell 310 may have a first tab 311a and a second tab 311b at both ends. The first tab 311a of one battery cell 310 may be fixedly connected to the second tab 311b of an adjacent battery cell 310 by welding, thereby fixing the two battery cell 310 in the second direction to form a battery cell assembly 320. Of course, in other embodiments, the two battery cell 310 may also be fixedly connected by other methods, and the present embodiment is not limited thereto.

[0087] Based on the above embodiment, in the first direction, the two battery cell assemblies 320 can be fixedly connected by an adhesive. In one possible implementation, the two battery cell assemblies 320 can be bonded together by using a cushioning foam, so that the two battery cell assemblies 320 are fixedly connected and form a whole.

[0088] Continue to refer Figure 4 On the basis of the above embodiment, taking the whole formed by the two connected battery cell assemblies 320 as an example, a spacer 321 can be provided on one side of the battery cell assembly 320 in the first direction. The size of the spacer 321 can be greater than or equal to the size of the two battery cell units 310 arranged side by side in the second direction, so that the spacer 321 can completely cover the entire battery cell assembly 320. It can be understood that the spacer 321 can be made of an anti-expansion material, so that the battery cell unit 310 can effectively absorb the expansion force through the spacer 321 when it is in the final stage. For example, the spacer 321 can be made of an anti-expansion material such as a fluoroethylene propylene material, and the embodiment of the present application is not limited here.

[0089] Continue to refer Figure 5Based on the above embodiment, a housing 322 may be provided on the other side of the battery cell assembly 320 in the first direction. In one possible implementation, the housing 322 may have an opening 3221, and the battery cell assembly 320 may be placed in the housing 322 through the opening 3221. It is understood that the battery cell assembly 320 may be bonded to the housing 322 via an adhesive layer. After placing two connected battery cell assemblies 320 in the housing 322, a battery cell module 330 is formed.

[0090] Among them, in a possible implementation, such as Figure 5 As shown, the shell 322 can be a C-shaped shell. In the embodiment of the present application, the shell 322 can include a first side wall 3222 and two opposite second side walls 3223. The first side wall 3222 can be arranged opposite to a surface of the battery cell assembly 320 in the first direction, and the two second side walls 3223 can be arranged on both sides of the first side wall 3222 in the third direction, and the two second side walls 3223 are both located on the same side of the first side wall 3222 in the first direction, so that the first side wall 3222 and the two second side walls 3223 form a C-shaped structure. In this way, the first side wall 3222 and the two second side walls 3223 can form an opening 3221, and the battery cell assembly 320 can be placed in the shell 322 along the opening 3221.

[0091] Among them, in another possible implementation, such as Figure 6 As shown, the shell 322 can also be an I-shaped shell. In the embodiment of the present application, the shell 322 can include a first side wall 3222 and two opposing second side walls 3223. The first side wall 3222 can be arranged opposite to a surface of the battery cell assembly 320 in the first direction, and the two second side walls 3223 can be arranged on both sides of the first side wall 3222 in the third direction. It can also be understood that the two second side walls 3223 are located on both sides of the first side wall 3222 in the first direction, so that the first side wall 3222 and the two second side walls 3223 form an I-shaped structure. In this way, the first side wall 3222 and the two second side walls 3223 can form two back-to-back openings 3221 in the first direction, and the two battery cell assemblies 320 can be placed in the shell 322 along the openings 3221 respectively. In the embodiment of the present application, one shell 322 can be adapted to accommodate two battery cell assemblies 320, thereby saving the number of shells 322 and further saving the internal space of the battery pack 100.

[0092] It is understood that the shell 322 and the spacer 321 can cover at least four surfaces of the battery cell assembly 320, thereby constraining the battery cell assembly 320. Thus, when the battery cell 310 experiences thermal runaway, the shell 322 and the spacer 321 can constrain the battery cell 310 so that the flame and the filler can be directed along the second direction of the battery cell 310 after the runaway, thereby converting the non-directional free jet after the thermal runaway of the battery cell 310 into a directional runaway.

[0093] Based on the above embodiment, in the cell module 330, the two cell assemblies 320 respectively have pole tabs 311 connected by welding, and the two pole tabs 311 can be arranged in parallel. By arranging a connector 340 between the two pole tabs 311, the two pole tabs 311 can be electrically connected. In one possible embodiment, for example, Figure 7 As shown, the connector 340 can be an X-shaped aluminum sheet, which is not limited in this embodiment of the present application. It is understood that one end of the connector 340 can be connected to the tab 311 in one of the battery cell assemblies 320, and the other end of the connector 340 can be connected to the tab 311 in another battery cell assembly 320.

[0094] like Figure 8 as well as Figure 9 As shown, it is understood that a plurality of battery cell modules 330 can be stacked to form a battery module 300, and the battery module 300 is extruded to a specified size and then fixed to the extruded battery module 300 by a strap 500. In one possible embodiment, the strap 500 can be a carbon fiber strapping strap, which is not limited in this embodiment of the present application.

[0095] Continue to refer Figure 10 Based on the above embodiment, the integrated board 600 may be provided with a groove 610. In one possible embodiment, the number of grooves 610 may be multiple, and this embodiment of the present application is not limited thereto. In this embodiment of the present application, multiple grooves 610 may be arranged in parallel along the first direction, and the grooves 610 may correspond to multiple tabs 311 in the battery module 300.

[0096] Continue to refer Figure 10 On the basis of the above embodiment, a pole piece 620 may be provided on the groove 610, and a through hole 621 may be opened at a position of the pole piece 620 corresponding to the pole ear 311, so that the pole ear 311 can be passed through the through hole 621, and then the pole ear 311 is bent toward the pole piece 620, so that the pole ear 311 can be pressed onto the pole piece 620, thereby realizing electrical connection between the pole ear 311 and the pole piece 620.

[0097] In one possible embodiment, taking the example of a first pole tab 311a of one battery cell 310 being fixedly connected to the second pole tab 311b of an adjacent battery cell 310, the unconnected pole tab 311 in one of the battery cell 310 is the second pole tab 311b. Of course, the embodiment of the present application is not limited here. Accordingly, in the battery module 300, the second pole tabs 311b of several battery cell units 310 are arranged side by side in the first direction, and each pole piece 620 in the integrated board 600 can be provided with at least two through holes 621, and each through hole 621 can be arranged corresponding to the second pole tab 311b, so that the second pole tab 311b can be passed through the through hole 621 and pressed onto the pole piece 620, and then the second pole tab 311b and the pole piece 620 are welded to achieve electrical connection between the second pole tab 311b and the pole piece 620.

[0098] Based on the above embodiment, the battery pack 100 may further include a liquid cooling plate (not shown). The liquid cooling plate may also be located within the battery housing 200. In one possible implementation, the liquid cooling plate may be located between the battery module 300 and the battery housing 200, thereby dissipating heat from the battery module 300. For example, the liquid cooling plate may be bonded to the battery module 300 using structural adhesive, although this embodiment of the present application is not limiting.

[0099] Continue to refer Figure 9 On the basis of the above embodiment, the box beam assembly 400 may include a box cross beam 410, a box longitudinal beam 420 and a box convex beam 430. The box cross beam 410 and the box longitudinal beam 420 may be arranged vertically to form a cross structure, and the box convex beam 430 may be located on both sides of the box cross beam 410 and the box longitudinal beam 420. Figure 2 As shown, the box cross beam 410, the box longitudinal beam 420, and the box convex beam 430 can divide the installation cavity 210 of the battery box 200 into a plurality of module cavities 220 for placing the battery modules 300. Each battery module 300 can be placed in a module cavity 220. The box beam assembly 400 is connected to the battery box 200 by bolts, thereby completing the assembly of the battery pack 100.

[0100] In the embodiment of the present application, the assembly method of the battery pack 100 provided in the embodiment of the present application is to connect the battery cell units 310 into battery cell assemblies 320, and then connect them into battery cell modules 330, and then stack them into a battery module 300, and squeeze the battery module 300, and finally place the entire battery pack 100 in the battery case 200, so that the battery pack 100 has a firm structure and can withstand the large expansion force of the solid-state battery.

[0101] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0102] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0103] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0104] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0105] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0106] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A method for assembling a battery pack, characterized in that: The assembly method comprises: Providing a battery cell unit (310) and a battery box (200); The battery cell units (310) are fixedly connected to form battery cell assemblies (320), and buffer members are provided between the battery cell assemblies (320) to securely connect the battery cell assemblies (320); Placing the connected battery cell assembly (320) in a housing (322) to form a battery cell module (330); stacking a plurality of battery cell modules (330) to form a battery module (300), and extruding the battery module (300) to a specified size; An integrated board (600) is provided on one side of the extruded battery module (300), and the battery core units (310) in the battery module (300) are electrically connected via the integrated board (600); The battery module (300) is assembled in the battery box (200).

2. The battery pack assembly method according to claim 1, wherein: The battery cell unit (310) and the battery box (200) are provided, including: A plurality of battery core units (310) are provided, and a battery box (200) having a mounting cavity (210) is provided.

3. The battery pack assembly method according to claim 2, characterized in that: The step of fixedly connecting the battery cell units (310) to form a battery cell assembly (320) comprises: The tabs (311) of each two battery cell units (310) are fixedly connected by welding to form the battery cell assembly (320); The buffering member is provided between the battery cell assemblies (320) to securely connect the battery cell assemblies (320), comprising: Buffer foam is provided between the battery core assemblies (320), so that every two battery core assemblies (320) are bonded and connected via the buffer foam.

4. The battery pack assembly method according to claim 3, characterized in that: After placing the connected battery cell assembly (320) in a housing (322) to form a battery cell module (330), the method further includes: The tabs (311) of the battery cell assembly (320) in the battery cell module (330) are electrically connected via a connector (340).

5. The battery pack assembly method according to claim 4, characterized in that: After stacking a plurality of battery cell modules (330) to form a battery module (300), and extruding the battery module (300) to a specified size, the method further comprises: The binding belt (500) is fixed to the extruded battery module (300) to restrain the battery module (300).

6. The battery pack assembly method according to claim 5, characterized in that: An integrated board (600) is provided on one side of the extruded battery module (300), and the integrated board (600) is used to electrically connect the respective battery core units (310) in the battery module (300), and further comprising: The unconnected tabs (311) of each of the battery cell units (310) in the battery module (300) are pressed onto the pole piece (620) of the integrated board (600) and are electrically connected by welding.

7. A battery pack, characterized in that: include: Several battery modules (300); A battery box (200), wherein a plurality of battery modules (300) are located in the battery box (200); A box beam assembly (400), wherein a plurality of battery modules (300) are arranged between the box beam assemblies (400); An integrated board (600), the integrated board (600) is located on one side of the battery module (300) and is fixedly connected to the tab (311) of the battery module (300).

8. The battery pack according to claim 7, characterized in that: Each of the battery modules (300) has a plurality of battery core units (310), and the plurality of battery core units (310) are stacked in a first direction; Each of the battery cell units (310) has the tabs (311) at both ends in the second direction, and the tabs (311) of every two adjacent battery cell units (310) in the second direction are electrically connected to form a battery cell assembly (320).

9. The battery pack according to claim 8, characterized in that: A spacer (321) is provided on one side of the battery cell assembly (320) in the first direction; The other surface of the battery cell assembly (320) in the first direction is provided with a shell (322), the shell (322) having an opening (3221), and the battery cell assembly (320) is arranged in the shell (322) through the opening (3221).

10. The battery pack according to claim 8, wherein: The integrated board (600) is provided with a plurality of grooves (610) arranged along the first direction, and a pole piece (620) is provided on the groove (610). A through hole (621) is provided at a position of the pole piece (620) corresponding to the pole ear (311), so that the pole ear (311) is passed through the through hole (621) and pressed onto the pole piece (620).

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