Battery Pack and Assembly Method

Abstract

This invention provides a battery pack and its assembly method. The battery pack includes a frame assembly, a base plate, and battery cell assemblies. The frame assembly includes a first longitudinal beam, a second longitudinal beam, and multiple crossbeams. The crossbeams are spaced apart and connected between the first and second longitudinal beams. A base plate is provided between adjacent crossbeams, and the base plate is detachably connected to the crossbeams. Battery cell assemblies are provided between at least some adjacent crossbeams, and the battery cell assemblies are supported on the base plate. In this embodiment of the battery pack, the base plate and the supported battery cell assemblies can be disassembled and assembled separately, allowing for independent replacement of the entire disassembled battery cell assembly or several cells within the disassembled battery cell assembly. Therefore, the battery pack of this embodiment has good maintainability.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically to a battery pack and its assembly method. Background Technology

[0002] In related technologies, the battery pack has a liquid cooling plate and a frame on the base plate. The frame has multiple partitions arranged side by side, and a cell group is arranged between two adjacent partitions. The cell group is bonded to the partition and / or the liquid cooling plate. However, in related technologies, it is difficult to disassemble the cells of the battery pack, especially to independently replace several damaged cells, resulting in poor maintainability of the battery pack. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention provide a battery pack.

[0005] This invention also proposes a battery pack assembly method.

[0006] The battery pack of this invention includes:

[0007] The frame assembly includes a frame component, a base plate, and a battery cell assembly. The frame component includes a first longitudinal beam, a second longitudinal beam, and multiple cross beams. The multiple cross beams are spaced apart and connected between the first longitudinal beam and the second longitudinal beam. The base plate is provided between adjacent cross beams. The base plate is detachably connected to the cross beams. The battery cell assembly is provided between at least some of the adjacent cross beams, and the battery cell assembly is supported on the base plate.

[0008] In the battery pack of this embodiment, the base plate is disposed between adjacent crossbeams and supports the corresponding cell group. The base plate and the crossbeams are detachably connected so that the base plate and the supported cell group can be disassembled and assembled separately, thereby allowing the entire disassembled cell group or several cells in the disassembled cell group to be replaced independently. Therefore, the battery pack of this embodiment has good maintainability.

[0009] In some embodiments, the base plate is snap-fitted to the bottom of the crossbeam.

[0010] In some embodiments, the bottom of the crossbeam has a crossbeam retainer extending toward another crossbeam adjacent to the crossbeam, and the side wall of the base plate is provided with a first retainer groove, in which the crossbeam retainer engages.

[0011] In some embodiments, a sealant layer is provided between the crossbeam mounting platform and the groove wall of the first slot.

[0012] In some embodiments, the base plate is detachably connected to the first longitudinal beam and the second longitudinal beam.

[0013] In some embodiments, the bottom of both the first longitudinal beam and the bottom of the second longitudinal beam are snapped together with the base plate.

[0014] In some embodiments, the bottom of the first longitudinal beam has a first longitudinal beam mounting platform extending toward the second longitudinal beam, the bottom of the second longitudinal beam has a second longitudinal beam mounting platform extending toward the first longitudinal beam, and the end wall of the base plate is provided with a second slot, wherein the first longitudinal beam mounting platform and the second longitudinal beam mounting platform are engaged in the corresponding second slot.

[0015] In some embodiments, a sealant layer is provided between the first longitudinal beam mounting platform and the corresponding second mounting slot wall surface, and a sealant layer is provided between the second longitudinal beam mounting platform and the corresponding second mounting slot wall surface.

[0016] In some embodiments, the crossbeam includes a heat exchange crossbeam, the interior of which is provided with heat exchange channels for the flow of heat exchange medium, and the heat exchange crossbeam is located between adjacent battery cells.

[0017] In some embodiments, the first longitudinal beam has a flow-diverting channel for the flow of heat exchange medium inside, and the second longitudinal beam has a flow-combining channel for the flow of heat exchange medium inside, and the heat exchange channel of the heat exchange crossbeam is connected between the flow-diverting channel and the flow-combining channel.

[0018] In some embodiments, the frame assembly further includes a connecting bolt, the connecting bolt having a connecting channel inside, the connecting bolt including a first connecting bolt and a second connecting bolt, the first connecting bolt connecting the first longitudinal beam and the heat exchange crossbeam, and the connecting channel of the first connecting bolt connecting the diversion channel and the heat exchange channel, the second connecting bolt connecting the second longitudinal beam and the heat exchange crossbeam, and the connecting channel of the second connecting bolt connecting the convergence channel and the heat exchange channel.

[0019] In some embodiments, the crossbeam includes a supporting crossbeam, and there are at least two supporting crossbeams. At least some of the adjacent supporting crossbeams are provided with a plurality of heat exchange crossbeams arranged at intervals, and the battery cell assembly is provided between the supporting crossbeams and the adjacent heat exchange crossbeams.

[0020] In some embodiments, the battery pack further includes a top pressure assembly connected to the top of the frame assembly and abutting against the top of the cell assembly.

[0021] In some embodiments, the top pressure assembly includes a pressure bar that is detachably connected to at least a portion of the support beam and abuts against the top of the battery cell assembly.

[0022] In some embodiments, the cell assembly includes at least two cells arranged at intervals. The top of the cell assembly is provided with a plurality of pressure bars, which are arranged at intervals along the cell arrangement direction of the cell assembly. The top of each pressure bar is provided with a protrusion extending along the interval arrangement direction of the pressure bars. Along the arrangement direction of the plurality of pressure bars, the bottom of the outermost pressure bar is located outside the outermost cell, and the protrusion of the outermost pressure bar abuts against the top of the outermost cell. The bottoms of the remaining pressure bars are inserted between adjacent cells, and the protrusions of the remaining pressure bars abut against the top of adjacent cells.

[0023] In some embodiments, the top pressure assembly includes a cover plate connected to the first longitudinal beam, the second longitudinal beam, and the outermost support beam along the spacing direction of the plurality of beams.

[0024] In some embodiments, the battery pack further includes at least one of a foam layer, an insulating sheet, and a plastic sheet;

[0025] The foam layer is provided between the supporting beam and the battery cell assembly, and / or between the heat exchange beam and the battery cell assembly;

[0026] The insulating sheet is provided between the heat exchange beam and the battery cell assembly, between the base plate and the battery cell assembly, and between the pressure strip and the battery cell assembly;

[0027] The plastic plate is provided between the supporting beam and the battery cell assembly.

[0028] The battery pack assembly method of this invention includes:

[0029] S1. Using at least one crossbeam as a reference, the base plate and the battery cell assembly carried on it are alternately connected to the crossbeam in sequence to form a first assembly part; at least one crossbeam other than the crossbeam of the first assembly part is connected between the first longitudinal beam and the second longitudinal beam to form a second assembly part.

[0030] S2. Move the first assembly part into the second assembly part, the crossbeam in the second assembly part is connected to the outermost bottom plate in the first assembly part along the arrangement direction, and / or, the crossbeam in the second assembly part is spaced apart from the outermost crossbeam in the first assembly part, the bottom plate is connected between the crossbeam in the second assembly part and the outermost crossbeam in the first assembly part, and the crossbeam in the first assembly part is connected between the first longitudinal beam and the second longitudinal beam.

[0031] The battery pack assembly method of this invention involves sequentially and alternately connecting a base plate and a battery cell assembly to a crossbeam as a reference to form a first assembly part. At least one crossbeam other than the crossbeam of the first assembly part is connected between a first longitudinal beam and a second longitudinal beam to form a second assembly part. The first assembly part is then moved into the second assembly part and connected. Therefore, the first assembly part and the second assembly part are assembled separately, and then the first assembly part and the second assembly part are assembled together. This avoids interference problems caused by the first assembly part being directly assembled in the second assembly part, thus reducing the assembly difficulty of the battery pack.

[0032] Meanwhile, the battery pack obtained by the battery pack assembly method of the present invention has a base plate located between the bottoms of adjacent crossbeams and supporting the corresponding cell groups. The base plate is detachably connected to the bottom of the crossbeams, so that the base plate and the supported cell groups can be disassembled and assembled separately, thereby allowing the entire disassembled cell group or several cells in the disassembled cell group to be replaced independently. Therefore, the battery pack obtained by the battery pack assembly method of the present invention has good maintainability.

[0033] In some embodiments, the crossbeam includes a heat exchange crossbeam and a support crossbeam, and the heat exchange crossbeam has a heat exchange channel inside for the flow of heat exchange medium.

[0034] In step S1, at least one of the supporting crossbeams is used as a reference, and the base plate and the battery cell assembly are alternately connected to the heat exchange crossbeam in sequence to form the first assembly part; at least one of the supporting crossbeams other than the supporting crossbeam of the first assembly part is connected between the first longitudinal beam and the second longitudinal beam to form the second assembly part.

[0035] In step S2, the first assembly part is moved into the second assembly part, the support beam in the second assembly part is connected to the outermost base plate in the first assembly part along the arrangement direction, and / or, the support beam in the second assembly part is arranged at intervals with the outermost support beam or heat exchange beam in the first assembly part along the arrangement direction, the base plate is connected between the support beam in the second assembly part and the outermost support beam or heat exchange beam in the first assembly part, and the heat exchange beam and the support beam in the first assembly part are both connected between the first longitudinal beam and the second longitudinal beam.

[0036] In some embodiments, in step S1, the crossbeam serving as a reference is connected between the first positioning beam and the second positioning beam, and then the base plate and the battery cell assembly being carried are sequentially and alternately connected to the crossbeam, wherein each sequential connection of the crossbeam is made between the first positioning beam and the second positioning beam to define the position of each base plate, the battery cell assembly and each sequentially connected crossbeam relative to the crossbeam serving as a reference.

[0037] In step S2, the first assembly part is clamped along the arrangement direction of the first assembly part by the clamping member, then the first positioning beam and the second positioning beam are removed, the first assembly part clamped by the clamping member is moved into the second assembly part, the crossbeam of the first assembly part is connected between the first longitudinal beam and the second longitudinal beam, and then the clamping member is removed.

[0038] In some embodiments, in step S1, the first assembly portion is connected and formed above the second assembly portion, and the crossbeam, as a reference, is kept constant in the horizontal direction relative to the second assembly portion;

[0039] In step S2, the first assembly portion that has been connected and formed descends relative to the second assembly portion and falls into the second assembly portion.

[0040] In some embodiments, the battery pack assembly method further includes:

[0041] S3. A top pressure assembly is provided, wherein the top pressure assembly is connected to the top of at least two of the crossbeams and abuts against the top of the battery cell assembly.

[0042] In some embodiments, the cell assembly includes at least two cells spaced apart, and the pressure assembly includes a plurality of pressure bars, the top of which is provided with a boss;

[0043] In step S3, multiple pressure bars are arranged at intervals along the arrangement direction of the battery cells, and the battery cells are placed between the bottoms of two adjacent pressure bars, with the top of the battery cells abutting against the boss. Then, the pressure bars are connected to the tops of at least two crossbeams.

[0044] In some embodiments, during step S1, during the process of alternately connecting the base plate and the cell assembly to the crossbeam, a limiting member is provided between adjacent cells of the cell assembly;

[0045] In step S3, the limiting member is first removed, and then multiple pressure strips are arranged at intervals along the arrangement direction of the battery cell. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the battery pack after the cover plate has been removed according to an embodiment of the present invention;

[0047] Figure 2 This is an exploded schematic diagram of the battery pack according to an embodiment of the present invention;

[0048] Figure 3 This is a partially enlarged view of an exploded view of a battery pack according to an embodiment of the present invention;

[0049] Figure 4 This is a front view of the battery pack's cell assembly, heat exchange beam, and base plate according to an embodiment of the present invention.

[0050] Figure 5 This is a partially enlarged schematic diagram of the battery pack after the cover plate has been removed according to an embodiment of the present invention;

[0051] Figure 6 This is a partially enlarged view of the exploded view of the battery pack after the cover plate has been removed, according to an embodiment of the present invention.

[0052] Figure 7 This is a side view of the pressure strip and cell assembly of the battery pack according to an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the battery pack assembly method according to an embodiment of the present invention. Figure 1 ;

[0054] Figure 9 This is a schematic diagram of the battery pack assembly method according to an embodiment of the present invention. Figure 2 ;

[0055] Figure 10 This is a schematic diagram of the assembly process of the first assembly part of the battery pack assembly method according to an embodiment of the present invention. Figure 1 ;

[0056] Figure 11 This is a schematic diagram of the assembly process of the first assembly part of the battery pack assembly method according to an embodiment of the present invention. Figure 2 ;

[0057] Figure 12 This is a schematic diagram of the battery pack assembly method according to an embodiment of the present invention. Figure 3 ;

[0058] Figure 13 This is a schematic diagram of the battery pack assembly method according to an embodiment of the present invention. Figure 4 ;

[0059] Figure 14 This is a schematic diagram of the battery pack assembly method according to an embodiment of the present invention. Figure 5 ;

[0060] Figure 15This is a schematic diagram of the battery pack assembly method according to an embodiment of the present invention. Figure 6 .

[0061] Figure label:

[0062] 1. Frame assembly; 11. First longitudinal beam; 111. First longitudinal beam mounting plate; 12. Second longitudinal beam; 13. Crossbeam; 131. Crossbeam mounting plate; 132. Heat exchange crossbeam; 133. Support crossbeam; 14. Connecting bolt; 15. Fixing bolt; 2. Base plate; 21. First slot; 3. Battery cell assembly; 31. Battery cell; 4. Sealing layer; 5. Top pressure assembly; 51. Pressure strip; 511. Boss; 52. Cover plate; 6. Foam layer; 7. Insulating sheet; 8. Plastic sheet; 9. Sealing strip; 10. First assembly part; 20. Second assembly part; 30. First positioning beam; 40. Second positioning beam; 50. Clamping component. Detailed Implementation

[0063] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0064] The following is for reference. Figures 1-15 A battery pack and assembly method according to embodiments of the present invention are described.

[0065] like Figures 1-7 As shown, the battery pack of this embodiment of the invention includes a frame assembly 1, a base plate 2, and a cell assembly 3.

[0066] Frame component 1 includes a first longitudinal beam 11, a second longitudinal beam 12, and a plurality of transverse beams 13, which are spaced apart and connected between the first longitudinal beam 11 and the second longitudinal beam 12. For example, as... Figures 1-3 As shown, the first longitudinal beam 11 and the second longitudinal beam 12 both extend in the left-right direction and are arranged at intervals in the front-back direction. The crossbeam 13 extends in the front-back direction and connects between the first longitudinal beam 11 and the second longitudinal beam 12. There are multiple crossbeams 13 arranged at intervals in the left-right direction.

[0067] A base plate 2 is provided between adjacent crossbeams 13, and the base plate 2 is detachably connected to the crossbeams 13. For example, as Figures 2-6 As shown, a corresponding base plate 2 is provided between the bottoms of each adjacent crossbeam 13. Therefore, there are multiple base plates 2 arranged at intervals. The base plate 2 is preferably a strip plate extending in the front-back direction. The base plate 2 is detachably connected to the bottom of the crossbeam 13. It can be understood that the base plate 2 is not limited to being connected between the bottoms of adjacent crossbeams 13, but can also be higher than the bottom of the crossbeam 13.

[0068] At least some adjacent crossbeams 13 are provided with battery cell assemblies 3, and the battery cell assemblies 3 are supported on the base plate 2. For example, such as Figure 2and Figure 3 As shown, except for the leftmost and rightmost adjacent crossbeams 13, each of the other adjacent crossbeams 13 is provided with a battery cell assembly 3, which is supported on the corresponding base plate 2. In other words, except for the leftmost and rightmost base plates 2, each of the other base plates 2 supports the corresponding battery cell assembly 3. It is understood that in some other embodiments, the corresponding battery cell assembly 3 can be provided between all adjacent crossbeams 13.

[0069] It should be noted that the battery cell group 3 refers to at least two battery cells 31 disposed between adjacent crossbeams 13, preferably but not limited to multiple cells. Multiple battery cells 31 can be arranged in one row, or in two or more rows arranged sequentially in the left and right direction.

[0070] The battery cell groups 3 on the base plate 2 can be set to the same number of rows or different numbers of rows. For example, some base plates 2 have one row of battery cells 31, while other base plates 2 have two rows of battery cells 31. Therefore, the number of battery cells 31 on the base plate 2 can be the same or different.

[0071] In the battery pack of this embodiment, the base plate is disposed between adjacent crossbeams and supports the corresponding cell group. The base plate and the crossbeams are detachably connected so that the base plate and the supported cell group can be disassembled and assembled separately, thereby allowing the entire disassembled cell group or several cells in the disassembled cell group to be replaced independently. Therefore, the battery pack of this embodiment has good maintainability.

[0072] In some embodiments, the bottom of the base plate 2 is snapped together with the bottom of the crossbeam 13 to facilitate the disassembly of the base plate 2 and the crossbeam 13, thereby facilitating the separate assembly and disassembly of the base plate 2 and the battery cell assembly 3 it carries.

[0073] It is understood that the bottom of the base plate 2 and the bottom of the crossbeam 13 are not limited to being snap-fitted together. In other embodiments, the bottom of the base plate 2 and the bottom of the crossbeam 13 are detachably bonded together with sealant, or detachably snapped together with clips, or detachably connected by connectors such as bolts.

[0074] In some embodiments, the bottom of the crossbeam 13 has a crossbeam mounting platform 131, which extends toward another crossbeam 13 adjacent to the crossbeam 13. The side wall of the bottom plate 2 is provided with a first mounting groove 21, and the crossbeam mounting platform 131 is fitted into the first mounting groove 21.

[0075] like Figures 3-5As shown, the bottom of the crossbeam 13 has a crossbeam mounting platform 131 extending in the left-right direction. Among the multiple crossbeams 13 arranged at intervals in the left-right direction, the bottom of the leftmost crossbeam 13 has a crossbeam mounting platform 131 extending to the right, and the bottom of the rightmost crossbeam 13 has a crossbeam mounting platform 131 extending to the left. The bottom of the remaining crossbeams 13 is provided with crossbeam mounting platforms 131 on both the left and right sides. In other words, the bottom of the remaining crossbeams 13 has a crossbeam mounting platform 131 extending to the right and a crossbeam mounting platform 131 extending to the left.

[0076] The left and right sides of the base plate 2 are provided with first slots 21, which are also formed on the bottom surface of the base plate 2. When the base plate 2 is connected between adjacent crossbeams 13, the crossbeam bracket 131 extending to the right of the crossbeam 13 on the left side of the base plate 2 is engaged in the first slot 21 on the left side of the base plate 2, and the crossbeam bracket 131 extending to the left of the crossbeam 13 on the right side of the base plate 2 is engaged in the first slot 21 on the right side of the base plate 2, thereby supporting the base plate 2 and allowing the base plate 2 to move upward relative to the adjacent crossbeams 13 for disassembly.

[0077] It is understood that the crossbeam 13 and the base plate 2 are not limited to being connected by the crossbeam locking platform 131 and the first locking groove 21. In other embodiments, the side of the crossbeam 13 is flush with and abuts the side of the base plate 2. The base plate 2 abuts between the sides of adjacent crossbeams 13 and is locked between adjacent crossbeams 13 by the spacing between adjacent crossbeams 13. Furthermore, in the adjacent crossbeams 13, the right side of the bottom of the left crossbeam 13 and the left side of the bottom of the right crossbeam 13 are inclined and relatively close together in a downward direction. The left side and right side of the base plate 2 are also inclined and relatively close together in a downward direction. This allows the base plate 2 to be locked between the right side of the bottom of the left crossbeam 13 and the left side of the bottom of the right crossbeam 13, and can prevent the base plate 2 from falling off the adjacent crossbeams 13.

[0078] In some embodiments, a sealant layer 4 is provided between the crossbeam mounting plate 131 and the groove wall of the first slot 21.

[0079] like Figure 6 As shown, a sealant layer 4 is provided between the crossbeam mounting platform 131 and the groove wall of the first groove 21. In other words, the crossbeam mounting platform 131 and the groove wall of the first groove 21 are bonded together by sealant. Preferably, the sealant layer 4 is provided between the vertical wall of the crossbeam mounting platform 131 and the vertical groove wall of the first groove 21.

[0080] The sealant layer 4 assists in fixing the crossbeam bracket 131 and the base plate 2, and fills the gap caused by the processing error of the crossbeam bracket 131 and the first slot 21, thus playing a sealing role. At the same time, the adhesive strength of the sealant layer 4 will not hinder the disassembly of the base plate 2.

[0081] In some embodiments, the base plate 2 is detachably connected to the first longitudinal beam 11 and the second longitudinal beam 12.

[0082] like Figures 2-6 As shown, the base plate 2 is detachably connected to the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12, and is located between the first longitudinal beam 11 and the second longitudinal beam 12. This prevents gaps between the base plate 2 and the first longitudinal beam 11 and the second longitudinal beam 12, which could lead to foreign objects intruding and damaging the battery cell assembly 3, while also ensuring that the base plate 2 is detachable.

[0083] In some embodiments, the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 are both snapped together with the base plate 2 so as to facilitate the disassembly of the base plate 2 from the first longitudinal beam 11 and the second longitudinal beam 12, thereby facilitating the separate assembly and disassembly of the base plate 2 from the battery cell assembly 3 it carries.

[0084] It is understood that the bottom plate 2 is not limited to being snap-fitted to the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12. In other embodiments, the bottom plate 2 is detachably bonded to the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 by sealant, or detachably snapped together by clips, or detachably connected by connectors such as bolts.

[0085] In some embodiments, the bottom of the first longitudinal beam 11 has a first longitudinal beam mounting platform 111, which extends toward the second longitudinal beam 12. The bottom of the second longitudinal beam 12 has a second longitudinal beam mounting platform (not shown in the figure), which extends toward the first longitudinal beam 11. The end wall of the bottom plate 2 is provided with a second slot (not shown in the figure), and the first longitudinal beam mounting platform 111 and the second longitudinal beam mounting platform are engaged in the corresponding second slot.

[0086] like Figure 3 As shown, the bottom of the first longitudinal beam 11 has a rearwardly extending first longitudinal beam mounting platform 111, and the bottom of the second longitudinal beam 12 has a forwardly extending second longitudinal beam mounting platform. The front and rear walls of the base plate 2 are both provided with second mounting grooves. When the base plate 2 is connected between the first longitudinal beam 11 and the second longitudinal beam 12, the first longitudinal beam mounting platform 111 is engaged in the second mounting groove of the front wall of the base plate 2, and the second longitudinal beam mounting platform is engaged in the second mounting groove of the rear wall of the base plate 2, thereby supporting the base plate 2 and allowing the base plate 2 to move upward relative to the first longitudinal beam 11 and the second longitudinal beam 12 for disassembly.

[0087] It is understood that the first longitudinal beam 11 and the second longitudinal beam 12 are not limited to being connected to the second slot of the base plate 2 by the first longitudinal beam mounting plate 111 and the second longitudinal beam mounting plate. In other embodiments, the crossbeam 13 abuts between the first longitudinal beam 11 and the second longitudinal beam 12. Furthermore, the base plate 2 can be secured between the first longitudinal beam 11 and the second longitudinal beam 12 by the spacing between the first longitudinal beam 11 and the second longitudinal beam 12.

[0088] In some embodiments, a sealant layer 4 is provided between the first longitudinal beam mounting platform 111 and the groove wall surface of the corresponding second mounting slot, and a sealant layer 4 is provided between the second longitudinal beam mounting platform and the groove wall surface of the corresponding second mounting slot. In other words, the first longitudinal beam mounting platform 111 and the groove wall surface of the mating second mounting slot are bonded together with sealant, and the second longitudinal beam mounting platform and the groove wall surface of the mating second mounting slot are bonded together with sealant. Preferably, a sealant layer 4 is provided between the vertical wall surface of the first longitudinal beam mounting platform 111 and the vertical groove wall surface of the second mounting slot, and a sealant layer 4 is provided between the vertical wall surface of the second longitudinal beam mounting platform and the vertical groove wall surface of the second mounting slot.

[0089] The sealant layer 4 helps to fix the first longitudinal beam 11 to the base plate 2 and the second longitudinal beam 12 to the base plate 2, and fills the gaps caused by the processing errors of the first longitudinal beam 11, the second longitudinal beam 12 and the base plate 2, thus playing a sealing role. At the same time, the adhesive strength of the sealant layer 4 will not hinder the disassembly of the base plate 2.

[0090] It is understood that the base plate 2 is not limited to being simultaneously snapped together with the first longitudinal beam 11, the second longitudinal beam 12 and the cross beam 13. In other embodiments, the base plate 2 is snapped together with the cross beam 13 and bonded together with the first longitudinal beam 11 and the second longitudinal beam 12, or the base plate 2 is bonded together with the cross beam 13 and snapped together with the first longitudinal beam 11 and the second longitudinal beam 12.

[0091] In some embodiments, the crossbeam 13 includes a heat exchange crossbeam 132, the interior of which is provided with heat exchange channels for the flow of heat exchange medium, and the heat exchange crossbeam 132 is located between adjacent battery cell groups 3.

[0092] like Figures 2-6 As shown, the crossbeam 13 includes a heat exchange crossbeam 132. The heat exchange crossbeam 132 is preferably, but not limited to, multiple. The heat exchange crossbeam 132 has a heat exchange channel inside for the flow of heat exchange medium. The heat exchange medium is preferably, but not limited to, a liquid medium. The heat exchange crossbeam 132 is located between adjacent battery cell groups 3 to exchange heat and cool down the battery cell group 3, and at the same time, it serves to fix the battery cell group 3.

[0093] In some embodiments, the interior of the first longitudinal beam 11 is provided with a flow-diverting channel for the flow of the heat exchange medium, the interior of the second longitudinal beam 12 is provided with a flow-combining channel for the flow of the heat exchange medium, and the heat exchange channel of the heat exchange crossbeam 132 is connected between the flow-diverting channel and the flow-combining channel.

[0094] like Figure 2 and Figure 3As shown, the first longitudinal beam 11 has a flow-diverting channel inside for the flow of the heat exchange medium, which extends in the left-right direction and passes through all the heat exchange crossbeams 132. The second longitudinal beam 12 has a flow-combining channel inside for the flow of the heat exchange medium, which extends in the left-right direction and passes through all the heat exchange crossbeams 132. The heat exchange crossbeams 132 connect the first longitudinal beam 11 and the second longitudinal beam 12, and the front end of the heat exchange channel in the heat exchange crossbeam 132 is connected to the flow-diverting channel, and the rear end of the heat exchange channel is connected to the flow-combining channel.

[0095] The heat exchange medium is diverted through the branch channel of the first longitudinal beam 11 into the heat exchange channels of multiple heat exchange crossbeams 132. The heat exchange medium exchanges heat with the battery cell assembly 3 in the heat exchange channels, and then enters the confluence channel of the second longitudinal beam 12 where it is merged and discharged. Therefore, the flow channel structure through which the heat exchange medium passes is simple and easy to manufacture.

[0096] Preferably, the first longitudinal beam 11 is provided with a heat exchange medium inlet that connects to the diversion channel, and the second longitudinal beam 12 is provided with a heat exchange medium outlet that connects to the confluence channel. It is understood that in some other embodiments, the heat exchange medium inlet and the heat exchange medium outlet may also be provided on the crossbeam 13, preferably on other crossbeams 13 besides the heat exchange crossbeam 132.

[0097] In some embodiments, the frame assembly 1 further includes a connecting bolt 14, which has a connecting channel inside. The connecting bolt 14 includes a first connecting bolt and a second connecting bolt. The first connecting bolt connects the first longitudinal beam 11 and the heat exchange crossbeam 132, and the connecting channel of the first connecting bolt connects the diversion channel and the heat exchange channel. The second connecting bolt connects the second longitudinal beam 12 and the heat exchange crossbeam 132, and the connecting channel of the second connecting bolt connects the confluence channel and the heat exchange channel.

[0098] like Figure 2 and Figure 3 As shown, the frame assembly 1 also includes a connecting bolt 14, which connects the front end of the first longitudinal beam 11 and the heat exchange crossbeam 132, and connects the rear end of the second longitudinal beam 12 and the heat exchange crossbeam 132. The connecting bolt 14 connecting the first longitudinal beam 11 and the heat exchange crossbeam 132 is called the first connecting bolt, and the connecting bolt 14 connecting the second longitudinal beam 12 and the heat exchange crossbeam 132 is called the second connecting bolt.

[0099] The connecting bolt 14 has a connecting channel inside; in other words, the connecting bolt 14 is a hollow bolt. The first connecting bolt connects the diversion channel and the heat exchange channel, and the second connecting bolt connects the confluence channel and the heat exchange channel, so that the heat exchange medium can enter the heat exchange channel from the diversion channel and enter the confluence channel from the heat exchange channel.

[0100] The connecting bolt 14 serves to connect and fix the first longitudinal beam 11 and the heat exchange crossbeam 132, as well as to connect and fix the second longitudinal beam 12 and the heat exchange crossbeam 132. It also serves to connect the diversion channel and the heat exchange channel, as well as the confluence channel and the heat exchange channel, and has a high sealing performance.

[0101] In some embodiments, such as Figure 2 and Figure 3 As shown, the frame assembly 1 also includes fixing bolts 15, which include a first fixing bolt and a second fixing bolt. The first fixing bolt connects the front ends of the first longitudinal beam 11 and the heat exchange crossbeam 132, and the second fixing bolt connects the rear ends of the second longitudinal beam 12 and the heat exchange crossbeam 132. The fixing bolts 15 serve to connect and fix the first longitudinal beam 11 and the heat exchange crossbeam 132, as well as the second longitudinal beam 12 and the heat exchange crossbeam 132, ensuring the structural strength of the frame assembly 1.

[0102] Preferably, the front end and rear end of the heat exchange beam 132 are respectively connected to a connecting bolt 14 and two fixing bolts 15. The connecting bolt 14 and the two fixing bolts 15 are arranged at intervals in the vertical direction, and the connecting bolt 14 is located above the two fixing bolts 15.

[0103] In some embodiments, the crossbeam 13 includes a supporting crossbeam 133, there are at least two supporting crossbeams 133, and at least some of the adjacent supporting crossbeams 133 are provided with a plurality of heat exchange crossbeams 132 arranged at intervals, and a battery cell assembly 3 is provided between the supporting crossbeam 133 and the adjacent heat exchange crossbeam 132.

[0104] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the crossbeam 13 also includes supporting crossbeams 133, which can be at least two, such as two, three, or more than three, preferably five. Multiple heat exchange crossbeams 132 can be provided between all adjacent supporting crossbeams 133, or multiple heat exchange crossbeams 132 can be provided between some adjacent supporting crossbeams 133. Preferably, along the left-to-right direction, multiple heat exchange crossbeams 132 are provided between the second and third supporting crossbeams 133, and between the third and fourth supporting crossbeams 133, to facilitate battery pack assembly. Cell groups 3 are provided between adjacent supporting crossbeams 133 and heat exchange crossbeams 132.

[0105] The support beam 133 mainly serves a supporting function to ensure the structural strength of the frame assembly 1. At the same time, the support beam 133 also works with the heat exchange beam 132 to fix the battery cell assembly 3.

[0106] The supporting beam 133 is preferably connected to the first longitudinal beam 11 and the second longitudinal beam 12 by fixing bolts 15.

[0107] In some embodiments, the battery pack of the present invention further includes a top pressure assembly 5, which is connected to the top of the frame assembly 1 and abuts against the top of the cell assembly 3.

[0108] like Figure 2 As shown, the top of the frame assembly 1 is provided with a top pressing assembly 5, which abuts against the top of the cell assembly 3, thereby cooperating with the base plate 2 to fix the cell assembly 3. Therefore, the left-right direction of the cell assembly 3 is defined by the adjacent crossbeam 13, the front-back direction of the cell assembly 3 is defined by the first longitudinal beam 11 and the second longitudinal beam 12, and the up-down direction of the cell assembly 3 is defined by the corresponding base plate 2 and the top pressing assembly 5, thereby fixing the cell assembly 3 in the battery pack, ensuring stable installation of the cell assembly 3 and high safety.

[0109] In some embodiments, the top pressure assembly 5 includes a pressure bar 51, which is detachably connected to at least a portion of the support beam 133 and abuts against the top of the cell assembly 3.

[0110] like Figures 1-3 , Figures 5-7 As shown, the top-pressure assembly 5 includes a pressure strip 51 extending in a left-right direction. The pressure strip 51 can be detachably connected to the top of all the support beams 133, or detachably connected to the top of a portion of the support beams 133. Preferably, the pressure strip 51 is detachably connected to the top of adjacent support beams 133 where the battery cell assembly 3 is located in the middle. In other words, in a left-to-right direction, the pressure strip 51 is detachably connected between the top of the second support beam 133 and the top of the third support beam 133, and detachably connected between the top of the third support beam 133 and the top of the fourth support beam 133. The pressure strip 51 and the support beams 133 are preferably detachably connected by bolts.

[0111] Furthermore, the battery cell assembly 3 includes a plurality of battery cells 31 arranged sequentially in the front-back direction, and a plurality of pressure strips 51 are provided between adjacent support beams 133. The plurality of pressure strips 51 are arranged at intervals in the front-back direction so that the top of each battery cell 31 in the battery cell assembly 3 abuts against at least one pressure strip 51.

[0112] The pressure strip 51, in conjunction with the base plate 2, defines the vertical position of the cell assembly 3, resulting in a lower structural complexity and lighter weight for the battery pack. Furthermore, the pressure strip 51 is detachably connected to the support beam 133, facilitating the disassembly of the cell assembly 3 and the base plate 2.

[0113] In some embodiments, the battery cell assembly 3 includes at least two battery cells 31 arranged at intervals. The top of the battery cell assembly 3 is provided with a plurality of pressure strips 51. The plurality of pressure strips 51 are arranged at intervals along the arrangement direction of the battery cells 31 in the battery cell assembly 3. The top of the pressure strips 51 is provided with a boss 511 extending along the arrangement direction of the pressure strips 51. Along the arrangement direction of the plurality of pressure strips 51, the bottom of the outermost pressure strip 51 is located outside the outermost battery cell 31, and the boss 511 of the outermost pressure strip 51 abuts against the top of the outermost battery cell 31. The bottoms of the remaining pressure strips 51 are inserted between adjacent battery cells 31, and the bosses 511 of the remaining pressure strips 51 abut against the top of adjacent battery cells 31.

[0114] like Figure 1 and Figure 7 As shown, the battery cell assembly 3 includes a plurality of battery cells 31 arranged at intervals along the front-to-back direction.

[0115] The top of the pressure strip 51 is provided with a boss 511 extending in the front-to-back direction. In other words, both the front and back ends of the top of the pressure strip 51 are provided with bosses 511. In other words, the cross-section of the pressure strip 51 is "T" shaped.

[0116] Multiple pressure strips 51 are arranged at intervals along the front-to-back direction. The foremost pressure strip 51 is located at the front end of the foremost battery cell 31, and its bottom abuts against the front end face of the foremost battery cell 31. The protrusion 511 of the foremost pressure strip 51 abuts against the top surface of the foremost battery cell 31. The rearmost pressure strip 51 is located at the rear end of the rearmost battery cell 31, and its bottom abuts against the rear end face of the rearmost battery cell 31. The protrusion 511 of the rearmost pressure strip 51 abuts against the top surface of the rearmost battery cell 31. Adjacent battery cells 31 also have corresponding pressure strips 51, with the bottom of the pressure strips 51 inserted between them. The two protrusions 511 on the top of the pressure strip 51 abut against the top of the adjacent battery cell 31.

[0117] The two pressure strips 51 at the ends limit the position of the battery cell group 3 in the front-back direction. The pressure strips 51 between adjacent battery cells 31 can also limit the spacing between adjacent battery cells 31. At the same time, the pressure strips 51 cooperate with the base plate 2 to limit the position of each battery cell 31 in the vertical direction, ensuring that each battery cell 31 is installed stably.

[0118] Furthermore, multiple battery cell groups 3 are arranged side-by-side between two adjacent support beams 133. The battery cells 31 of the multiple battery cell groups 3 are arranged correspondingly in the left-right direction so that the gaps between adjacent battery cells 31 in the multiple battery cell groups 3 are connected. The foremost pressure bar 51 is located at the front end of the multiple battery cell groups 3, and the rearmost pressure bar 51 is located at the rear front end of the multiple battery cell groups 3. The remaining pressure bars 51 pass through the connecting gaps of the multiple battery cell groups 3 to simultaneously define the battery cells in the multiple battery cell groups 3.

[0119] In some embodiments, the top pressure assembly 5 includes a cover plate 52 connected to the first longitudinal beam 11, the second longitudinal beam 12, and the outermost support beam 133 located along the spaced arrangement direction of the plurality of crossbeams 13.

[0120] like Figure 2 As shown, the top pressure assembly 5 also includes a cover plate 52, which is detachably connected to the first longitudinal beam 11, the second longitudinal beam 12, the leftmost support beam 133 and the rightmost support beam 133, preferably but not limited to being detachably connected by bolts, for sealing and protection above the cell assembly 3.

[0121] Preferably, the top surfaces of the first longitudinal beam 11, the second longitudinal beam 12, the leftmost support beam 133, and the rightmost support beam 133 are provided with sealing strips 9, and the sealing strips 9 are connected to the cover plate 52 to achieve a sealed connection.

[0122] It is understood that the cover plate 52 and the pressure strip 51 are not limited to being provided simultaneously. In other embodiments, the cover plate 52 abuts against the top of the battery cell assembly 3.

[0123] In some embodiments, the battery pack of the present invention further includes at least one of a foam layer 6, an insulating sheet 7, and a plastic plate 8.

[0124] A foam layer 6 is provided between the support beam 133 and the battery cell assembly 3, and / or between the heat exchange beam 132 and the battery cell assembly 3.

[0125] like Figure 6 As shown, a foam layer 6 is provided between the adjacent support beam 133 and heat exchange beam 132 where the battery cell assembly 3 is located. A foam layer 6 is also provided between the battery cell assembly 3 and the heat exchange beam 132. Between the adjacent heat exchange beams 132, the battery cell assembly 3 is arranged in two rows side by side, and a foam layer 6 is provided between the two rows of battery cell assembly 3.

[0126] The foam layer 6 acts as a buffer and support for the battery cell assembly 3, preventing the battery cells 31 of the battery cell assembly 3 from shaking and colliding, and also plays a role in flame retardancy.

[0127] Insulating sheets 7 are provided between the heat exchange beam 132 and the battery cell assembly 3, between the base plate 2 and the battery cell assembly 3, and between the pressure strip 51 and the battery cell assembly 3.

[0128] like Figure 6 As shown, an insulating sheet 7 is provided between the battery cell assembly 3 and the base plate 2. An insulating sheet 7 is also provided between the battery cell assembly 3 and the heat exchange beam 132. Between the adjacent supporting beam 133 and the heat exchange beam 132 where the battery cell assembly 3 is located, both the insulating sheet 7 and the foam layer 6 are provided, with the foam layer 6 positioned between the insulating sheet 7 and the battery cell assembly 3. An insulating sheet 7 is also provided between the battery cell assembly 3 and the pressure strip 51.

[0129] The insulating sheet 7 serves an insulating function.

[0130] A plastic plate 8 is provided between the supporting beam 133 and the battery cell assembly 3.

[0131] like Figure 6 As shown, a plastic plate 8 and a foam layer 6 are provided between the supporting beam 133 and the battery cell assembly 3, with the foam layer 6 located between the plastic plate 8 and the battery cell assembly 3.

[0132] The plastic plate 8 serves to protect and insulate the battery cell assembly 3.

[0133] It is understood that in other embodiments, the space between the support beam and the battery cell assembly may also be an insulating sheet and a foam layer.

[0134] The following is for reference. Figures 1-15 A battery pack assembly method according to an embodiment of the present invention is described.

[0135] It should be noted that the battery pack assembly method of the present invention is preferably, but not limited to, assembling the battery pack of the present invention. The following describes the battery pack assembly method according to the present invention, taking the battery pack of the present invention as an example.

[0136] like Figures 8-15 As shown, the battery pack assembly method of this embodiment includes steps S1 and S2.

[0137] Step S1 includes using at least one crossbeam 13 as a reference and sequentially and alternately connecting the base plate 2 and the battery cell assembly 3 to the crossbeam 13 to form a first assembly part 10; at least one crossbeam 13 other than the crossbeam 13 of the first assembly part 10 is connected between the first longitudinal beam 11 and the second longitudinal beam 12 to form a second assembly part 20.

[0138] For example, such as Figures 8-13 As shown, the first assembly part 10 and the second assembly part 20 of the battery pack are assembled respectively.

[0139] The first assembly section 10 uses at least one crossbeam 13 of the battery pack as a reference, and alternately connects the base plate 2 and the supporting cell assembly 3 to the crossbeam 13 in sequence. Preferably, there are two crossbeams 13 serving as references, and the base plate 2 and the supporting cell assembly 3 are alternately connected to the crossbeams 13 in sequence at the two reference crossbeams 13. Specifically, the base plate 2 is first connected to the bottom of the previous crossbeam 13 (e.g., ...). Figure 10 As shown), then place the battery cell assembly 3 (as shown) on the base plate 2. Figure 11(As shown), then connect the bottom plate 2 and the battery cell assembly 3 to the side opposite to the previous crossbeam 13, and repeat the placement of the bottom plate 2, battery cell assembly 3 and crossbeam 13. The end of the placement can be the bottom plate 2 and the supporting battery cell assembly 3, or it can be the crossbeam 13. It is understood that in some other embodiments, the reference crossbeam 13 may be only one.

[0140] The second assembly portion 20 is formed by connecting at least one other crossbeam 13 of the battery pack with the first longitudinal beam 11 and the second longitudinal beam 12. Preferably, one crossbeam 13 other than the first assembly portion 10 is connected between the left ends of the first longitudinal beam 11 and the second longitudinal beam 12, another crossbeam 13 other than the first assembly portion 10 is connected between the right ends of the first longitudinal beam 11 and the second longitudinal beam 12, and yet another crossbeam 13 other than the first assembly portion 10 is connected between the middle of the first longitudinal beam 11 and the middle of the second longitudinal beam 12. It is understood that in other embodiments, the crossbeam 13 of the second assembly portion 20 may consist of only two crossbeams connected to the left and right ends, or only one crossbeam 13 may be provided.

[0141] The first assembly part 10 and the second assembly part 20 can be assembled simultaneously or sequentially.

[0142] Step S2 includes moving the first assembly part 10 into the second assembly part 20, connecting the crossbeam 13 in the second assembly part 20 to the outermost bottom plate 2 in the first assembly part 10 along the arrangement direction, and / or, arranging the crossbeam 13 in the second assembly part 20 and the outermost crossbeam 13 in the first assembly part 10 at intervals, connecting the bottom plate 2 between the crossbeam 13 in the second assembly part 20 and the outermost crossbeam 13 in the first assembly part 10, and connecting the crossbeam 13 in the first assembly part 10 between the first longitudinal beam 11 and the second longitudinal beam 12.

[0143] For example, such as Figures 13-15 As shown, the first assembly part 10, which has been assembled, is moved into the second assembly part 20, which has been assembled.

[0144] The first assembly section 10 begins with a reference beam 13 along the alternating connection direction. After the first assembly section 10 moves into the second assembly section 20, the reference beam 13 and the beam 13 of the second assembly section 20 are arranged at intervals, and the base plate 2 is connected between the two beams 13.

[0145] If the end of the first assembly section 10 along the alternating connection direction is a base plate 2 and a battery cell assembly 3, after the first assembly section 10 moves into the second assembly section 20, the end base plate 2 is connected to the crossbeam 13 of the second assembly section 20. If the end of the first assembly section 10 along the alternating connection direction is a crossbeam 13, after the first assembly section 10 moves into the second assembly section 20, the end crossbeam 13 and the crossbeam 13 of the second assembly section 20 are arranged at intervals, and the base plate 2 is connected between the two crossbeams 13. Preferably, in the first assembly section 10, the ends of the two crossbeams 13 arranged with the base plate 2 and the battery cell assembly 3 as references are both base plates 2 and battery cell assemblies 3, and the two end base plates 2 and battery cell assemblies 3 are arranged opposite each other in the left-right direction. After the first assembly section 10 moves into the second assembly section 20, the crossbeam 13 located in the middle of the second assembly section 20 is connected between the two end base plates 2.

[0146] Then all the crossbeams 13 in the first assembly section 10 are connected between the first longitudinal beam 11 and the second longitudinal beam 12, preferably by bolts.

[0147] The battery pack assembly method of this invention involves sequentially and alternately connecting a base plate and a battery cell assembly to a crossbeam as a reference to form a first assembly part. At least one crossbeam other than the crossbeam of the first assembly part is connected between a first longitudinal beam and a second longitudinal beam to form a second assembly part. The first assembly part is then moved into the second assembly part and connected. Therefore, the first assembly part and the second assembly part are assembled separately, and then the first assembly part and the second assembly part are assembled together. This avoids interference problems caused by the first assembly part being directly assembled in the second assembly part, thus reducing the assembly difficulty of the battery pack.

[0148] Meanwhile, the battery pack obtained by the battery pack assembly method of the present invention has a base plate located between the bottoms of adjacent crossbeams and supporting the corresponding cell groups. The base plate is detachably connected to the bottom of the crossbeams, so that the base plate and the supported cell groups can be disassembled and assembled separately, thereby allowing the entire disassembled cell group or several cells in the disassembled cell group to be replaced independently. Therefore, the battery pack obtained by the battery pack assembly method of the present invention has good maintainability.

[0149] Understandably, when at least one of foam layer 6, insulating sheet 7, and plastic plate 8 needs to be provided on the outer wall of the battery cell assembly 3, they need to be placed in sequence during the assembly process of the first assembly part 10. Specifically, first, the base plate 2 is connected to the bottom of the previous crossbeam 13, then at least one of foam layer 6, insulating sheet 7, and plastic plate 8 is placed on the base plate 2, at least one of foam layer 6, insulating sheet 7, and plastic plate 8 is placed on the side of the previous crossbeam 13, then the battery cell assembly 3 is placed on the base plate 2, at least one of foam layer 6, insulating sheet 7, and plastic plate 8 is placed on the side of the battery cell assembly 3 away from the previous crossbeam 13, and then the next crossbeam 13 is placed.

[0150] In some embodiments, the base plate 2 is snap-fitted to the bottom of the crossbeam 13. During the assembly of the first assembly part 10, the base plate 2 is placed on one side of the previous crossbeam 13, achieving a detachable snap-fit ​​connection. After the first assembly part 10 moves into the second assembly part 20, when the crossbeams 13 of the first assembly part 10 and the crossbeams 13 of the second assembly part 20 are arranged at intervals, the base plate 2 is lowered and placed between the two crossbeams 13, simultaneously achieving a detachable snap-fit ​​connection between the two crossbeams. This simplifies the battery pack assembly method and facilitates the disassembly of the base plate 2 and the supported cell assembly 3.

[0151] It is understandable that when a sealant layer 4 needs to be applied between the bottom of the base plate 2 and the bottom of the crossbeam 13, sealant needs to be applied to the unassembled crossbeam 13 and / or base plate 2 during or before the assembly of the first assembly part 10, in other words, during or before step S1. After the first assembly part 10 moves into the second assembly part 20, and when the base plate 2 needs to be placed between adjacent crossbeams 13, sealant needs to be applied to the corresponding crossbeam 13 and / or base plate 2 before the assembly of the first assembly part 10 and the second assembly part 20 or between the placement of the base plate 2, in other words, before step S1 or between the placement of the base plate 2 in step S2.

[0152] In some embodiments, the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 are both snap-fitted to the base plate 2. While the first assembly portion 10 moves into the second assembly portion 20, the base plate 2 falls between the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12, and is simultaneously detachably snap-fitted between the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12. This simplifies the battery pack assembly method and facilitates the disassembly of the base plate 2 and the supported battery cell assembly 3.

[0153] It is understandable that when a sealant layer 4 needs to be provided between the bottom of the base plate 2 and the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12, sealant needs to be applied to the bottom of the base plate 2 and / or the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 before the first assembly part 10 and the second assembly part 20 are assembled or between the first assembly part 10 being moved into the second assembly part 20. In other words, before step S1 or between step S1 and step S2, sealant needs to be applied to the bottom of the base plate 2 and / or the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12.

[0154] In some embodiments, the crossbeam 13 includes a heat exchange crossbeam 132 and a support crossbeam 133, and the heat exchange crossbeam 132 has a heat exchange channel inside for the flow of heat exchange medium.

[0155] In step S1, at least one support beam 133 is used as a reference, and the base plate 2 and the battery cell assembly 3 are alternately connected to the heat exchange beam 132 in sequence to form a first assembly part 10; at least one support beam 133 other than the support beam 133 of the first assembly part 10 is connected between the first longitudinal beam 11 and the second longitudinal beam 12 to form a second assembly part 20.

[0156] like Figure 8 As shown, in the first assembly section 10, the reference crossbeam 13 is a supporting crossbeam 133. Using the supporting crossbeam 133 as a reference, the base plate 2 and the supported battery cell assembly 3 are alternately connected to the heat exchange crossbeam 132. In other words, in the first assembly section 10, except for the reference crossbeam 13 which is a supporting crossbeam 133, all other sequentially connected crossbeams 13 are heat exchange crossbeams 132. In the second assembly section 20, the crossbeams 13 connecting the first longitudinal beam 11 and the second longitudinal beam 12 are all supporting crossbeams 133.

[0157] In step S2, the first assembly part 10 is moved into the second assembly part 20. The support beam 133 in the second assembly part 20 is connected to the outermost bottom plate 2 in the first assembly part 10 along the arrangement direction. And / or, the support beam 133 in the second assembly part 20 is arranged at intervals with the outermost support beam 133 or heat exchange beam 132 in the first assembly part 10 along the arrangement direction. The bottom plate 2 is connected between the support beam 133 in the second assembly part 20 and the outermost support beam 133 or heat exchange beam 132 in the first assembly part 10. The heat exchange beam 132 and the support beam 133 in the first assembly part 10 are both connected between the first longitudinal beam 11 and the second longitudinal beam 12.

[0158] like Figures 13-15As shown, the first assembly part 10 starts with a reference support beam 133 along the alternating connection direction. After the first assembly part 10 moves into the second assembly part 20, the reference support beam 133 and the support beam 133 of the second assembly part 20 are arranged at intervals, and the base plate 2 is connected between the two support beams 133.

[0159] If the end of the first assembly part 10 along the alternating connection direction is a base plate 2 and a battery cell assembly 3, after the first assembly part 10 moves into the second assembly part 20, the end base plate 2 is connected to the support beam 133 of the second assembly part 20. If the end of the first assembly part 10 along the alternating connection direction is a heat exchange beam 132, after the first assembly part 10 moves into the second assembly part 20, the end heat exchange beam 132 and the support beam 133 of the second assembly part 20 are arranged at intervals, and the base plate 2 is connected between the heat exchange beam 132 and the support beam 133.

[0160] Preferably, in the first assembly part 10, the ends of the two supporting crossbeams 133 arranged with reference to each other are both base plates 2 and battery cell groups 3, and the base plates 2 and battery cell groups 3 at the two ends are arranged opposite each other in the left and right direction. After the first assembly part 10 moves into the second assembly part 20, the supporting crossbeam 133 located in the middle of the second assembly part 20 is connected between the two base plates 2 at the ends.

[0161] Then, all the supporting beams 133 and heat exchange beams 132 in the first assembly part 10 are connected between the first longitudinal beam 11 and the second longitudinal beam 12. Preferably, the first longitudinal beam 11 and the second longitudinal beam 12 are connected to the heat exchange beam 132 by connecting bolts 14 and fixing bolts 15, and the supporting beams 133 are connected by fixing bolts 15.

[0162] The supporting beam 133 ensures the structural strength of the battery pack and the structural stability during the battery pack assembly process, while the heat exchange beam 132 dissipates heat and cools the cell group 3 during battery pack operation.

[0163] In some embodiments, in step S1, a reference beam 13 is connected between a first positioning beam 30 and a second positioning beam 40, and then the base plate 2 and the battery cell assembly 3 are sequentially and alternately connected to the beam 13. Each time a beam 13 is sequentially connected, the beam 13 is connected between the first positioning beam 30 and the second positioning beam 40 to define the position of each base plate 2, battery cell assembly 3 and each sequentially connected beam 13 relative to the reference beam 13.

[0164] like Figure 9As shown, both the first positioning beam 30 and the second positioning beam 40 extend in the left-right direction and are arranged at intervals in the front-back direction. The threaded holes of the connecting bolts 14 and fixing bolts 15 on the first positioning beam 30 are in the same position as the threaded holes of the connecting bolts 14 and fixing bolts 15 on the first longitudinal beam 11. The threaded holes of the connecting bolts 14 and fixing bolts 15 on the second positioning beam 40 are in the same position as the threaded holes of the connecting bolts 14 and fixing bolts 15 on the second longitudinal beam 12. Preferably, the shape and structural dimensions of the first positioning beam 30 are the same as those of the first longitudinal beam 11, and the shape and structural dimensions of the second positioning beam 40 are the same as those of the second longitudinal beam 12.

[0165] In step S1, a first positioning beam 30 is connected to the front end of the two reference support beams 133, and a second positioning beam 40 is connected to the rear end of the two reference support beams 133. Then, the base plate 2 and the battery cell assembly 3 are sequentially and alternately connected to the heat exchange beam 132 by the reference support beams 133. Each time a heat exchange beam 132 is sequentially connected, it is bolted between the first positioning beam 30 and the second positioning beam 40 to limit the connection between the heat exchange beam 132 and the reference support beams 133. The distance between the support beams 133 is defined by the heat exchange beams 132, and the distance between the front base plate 2 and the battery cell assembly 3 and the support beams 133 is defined by the heat exchange beams 132. This makes it easy to connect all the support beams 133 and heat exchange beams 132 in the first assembly part 10 between the first longitudinal beam 11 and the second longitudinal beam 12 after the first assembly part 10 is moved into the second assembly part 20, without having to readjust the positions of the support beams 133, heat exchange beams 132, base plate 2 and battery cell assembly 3 in the first assembly part 10.

[0166] In step S2, the first assembly part 10 is clamped along the arrangement direction of the first assembly part 10 by the clamping member 50, then the first positioning beam 30 and the second positioning beam 40 are removed, the first assembly part 10 clamped by the clamping member 50 is moved into the second assembly part 20, and then the crossbeam 13 of the first assembly part 10 is connected between the first longitudinal beam 11 and the second longitudinal beam 12 before the clamping member 50 is removed.

[0167] like Figures 12-15 As shown, the clamping member 50 is preferably, but not limited to, a clamping head. After the first assembly part 10 is assembled, the clamping head clamps the reference support beam 133 and the base plate 2 and the battery cell assembly 3 alternately connected by the support beam 133 to the heat exchange beam 132 in the left-right direction, so as to maintain the distance between the heat exchange beam 132, the base plate 2 and the battery cell assembly 3 and the reference support beam 133. Preferably, at least two clamping members 50 are provided on the same whole, spaced apart in the front-back direction.

[0168] After the clamping component 50 is installed stably, the first positioning beam 30 and the second positioning beam 40 are removed.

[0169] Then the first assembly part 10, which is held by the clamping member 50, is moved into the second assembly part 20.

[0170] Then, all the heat exchange beams 132 and support beams 133 in the first assembly part 10 are connected between the first longitudinal beam 11 and the second longitudinal beam 12 by connecting bolts 14 and fixing bolts 15.

[0171] After all the heat exchange beams 132 and support beams 133 in the first assembly section 10 are connected and stabilized, the clamping parts 50 are removed.

[0172] The clamping member 50 is used to limit the distance between the heat exchange crossbeam 132, the base plate 2 and the battery cell assembly 3 relative to the support crossbeam 133 which serves as its reference, to prevent the first assembly part 10 from loosening and deforming after the first positioning beam 30 and the second positioning beam 40 are removed, and to ensure that all the heat exchange crossbeams 132 and the support crossbeams 133 in the first assembly part 10 can be quickly and smoothly connected to the first longitudinal beam 11 and the second longitudinal beam 12.

[0173] In some embodiments, in step S1, the first assembly portion 10 is connected and formed above the second assembly portion 20, and the horizontal beam 13, serving as a reference, is kept constant in position relative to the second assembly portion 20 in the horizontal direction. In step S2, the connected first assembly portion 10 is lowered relative to the second assembly portion 20 and falls into the second assembly portion 20.

[0174] like Figures 8-15 As shown, in step S1, the second assembly part 20 is assembled before the first assembly part 10. Then, the support beam 133, which serves as the reference in the first assembly part 10, is placed inside the second assembly part 20. After the installation position of the support beam 133 relative to the second assembly part 20 in the horizontal plane is determined, the support beam 133 is moved vertically upward and the assembly of the first assembly part 10 is performed and completed above the second assembly part 20. During the assembly of the first assembly part 10, the position of the support beam 133 relative to the second assembly part 20 in the horizontal plane remains constant.

[0175] After the first assembly part 10 is assembled, step S2 is performed. In step S2, the assembled first assembly part 10 is vertically lowered and falls into the second assembly part 20. The support beam 133 returns to its installation position within the second assembly part 20. Since the installation position of the support beam 133 is determined, the distance between the base plate 2, the battery cell 31, and the heat exchange beam 132 (based on the support beam 133) and the support beam 133 is limited by the clamping member 50. Therefore, all the support beams 133 and heat exchange beams 132 of the first assembly part 10 are aligned with the threaded holes on the first longitudinal beam 11 and the second longitudinal beam 12 for installing the connecting bolts 14 and the fixing bolts 15. Directly installing the connecting bolts 14 and the fixing bolts 15 allows for the rapid connection of all the support beams 133 and heat exchange beams 132 of the first assembly part 10 between the first longitudinal beam 11 and the second longitudinal beam 12. This makes the battery pack assembly method highly efficient.

[0176] In some embodiments, the battery pack assembly method of the present invention further includes step S3, which includes setting a top pressure assembly 5, the top pressure assembly 5 being connected to the top of at least two crossbeams 13 and abutting against the top of the cell assembly 3.

[0177] like Figure 15 As shown, after step S2, the top pressure assembly 5 is detachably connected to the top of at least two support beams 133, and the top pressure assembly 5 abuts against the top of all the battery cell groups 3, thereby defining the position of the battery cell group 3 in the vertical direction by the top pressure assembly 5 and the base plate 2.

[0178] In some embodiments, the battery cell assembly 3 includes at least two battery cells 31 arranged at intervals, and the top pressing assembly 5 includes a plurality of pressure strips 51, with a boss 511 on the top of each pressure strip 51.

[0179] In step S3, multiple pressure strips 51 are arranged at intervals along the arrangement direction of the battery cell 31, and the battery cell 31 is placed between the bottoms of two adjacent pressure strips 51, with the top of the battery cell 31 abutting against the boss 511. Then, the pressure strips 51 are connected to the tops of at least two crossbeams 13.

[0180] like Figure 15 As shown, multiple pressure strips 51 are detachably connected between the tops of adjacent support beams 133 of the battery cell assembly 3. The pressure strips 51 extend in the left-right direction and are arranged at intervals in the front-back direction. Each battery cell 31 of the battery cell assembly 3 is located between the bottoms of adjacent pressure strips 51, and the front and rear ends of the top of each battery cell 31 abut against the protrusions 511 of the corresponding pressure strip 51, thereby making the battery cell 31 installed stably and ensuring the spacing between adjacent battery cells 31 in the battery cell assembly 3.

[0181] Furthermore, step S3 also includes installing a removable cover plate 52 on the top of the first longitudinal beam 11, the second longitudinal beam 12, and the two outermost support beams 133 along the left and right directions after the pressure strip 51 is installed.

[0182] In some embodiments, during step S1, during the alternating connection of the base plate 2 and the cell assembly 3 to the crossbeam 13, limiting members are provided between adjacent cells 31 of the cell assembly 3. In step S3, the limiting members are first removed, and then a plurality of pressure strips 51 are arranged at intervals along the arrangement direction of the cells 31.

[0183] Specifically, in step S1, during the alternating connection of the base plate 2 and the cell group 3 with the crossbeam 13, a limiting member is set between adjacent cells 31 of the cell group 3. The limiting member can also be a limiting block, the dimension of the limiting block in the front-back direction is the same as the dimension of the bottom of the pressure strip 51 in the front-back direction, so as to limit the distance between adjacent cells 31 of the cell group 3. The limiting member can also be a limiting strip, the dimension of the limiting strip in the front-back direction is the same as the dimension of the bottom of the pressure strip 51 in the front-back direction, and the limiting strip extends in the left-right direction to limit the distance between adjacent cells 31 of the cell group 3 in the front-back direction. Preferably, the limiting member is a limiting strip. After the first row of cell groups 3 is arranged by the support crossbeam 133 as a reference, multiple limiting strips are set on the cell group 3. The cells 31 in the subsequent arranged cell groups 3 are all placed on the corresponding base plate 2 according to the position of the limiting strip. In step S3, the limiting member is removed first, and then the pressure strip 51 is installed to facilitate the installation of the pressure strip 51. There is no need to readjust the position of the cell 31 again, so that the battery pack assembly method has high efficiency.

[0184] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0185] Furthermore, the terms "first" and "second" are used only for distinction and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0186] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0187] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0188] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0189] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery pack, characterized in that, include: The frame assembly (1), the base plate (2), and the battery cell assembly (3) are provided. The frame assembly (1) includes a first longitudinal beam (11), a second longitudinal beam (12), and a plurality of cross beams (13). The plurality of cross beams (13) are arranged at intervals and connected between the first longitudinal beam (11) and the second longitudinal beam (12). The base plate (2) is provided between adjacent cross beams (13). The base plate (2) is detachably connected to the cross beams (13). The battery cell assembly (3) is provided between at least some of the adjacent cross beams (13), and the battery cell assembly (3) is supported on the base plate (2). The bottom plate (2) is snapped together with the bottom of the crossbeam (13); The bottom of the crossbeam (13) has a crossbeam mounting platform (131), which extends toward another crossbeam (13) adjacent to the crossbeam (13). The side wall of the bottom plate (2) is provided with a first mounting groove (21), and the crossbeam mounting platform (131) is fitted into the first mounting groove (21). The battery pack assembly method includes: S1, using at least one crossbeam (13) as a reference, and sequentially and alternately connecting the base plate (2) and the supported cell assembly (3) to the crossbeam (13) to form a first assembly part (10); at least one crossbeam (13) other than the crossbeam (13) of the first assembly part (10) is connected between the first longitudinal beam (11) and the second longitudinal beam (12) to form a second assembly part (20); S2, and moving the first assembly part (10) into the second assembly part (20); The base plate can be moved upward relative to the adjacent crossbeam, thereby facilitating the separate assembly and disassembly of the base plate and the battery cell assembly it supports.

2. The battery pack according to claim 1, characterized in that, A sealing layer (4) is provided between the crossbeam mounting plate (131) and the groove wall of the first slot (21).

3. The battery pack according to claim 1, characterized in that, The base plate (2) is detachably connected to the first longitudinal beam (11) and the second longitudinal beam (12).

4. The battery pack according to claim 3, characterized in that, The bottom of the first longitudinal beam (11) and the bottom of the second longitudinal beam (12) are both snapped together with the base plate (2).

5. The battery pack according to claim 4, characterized in that, The bottom of the first longitudinal beam (11) has a first longitudinal beam mounting platform (111), which extends toward the second longitudinal beam (12). The bottom of the second longitudinal beam (12) has a second longitudinal beam mounting platform, which extends toward the first longitudinal beam (11). The end wall of the bottom plate (2) is provided with a second slot. The first longitudinal beam mounting platform (111) and the second longitudinal beam mounting platform are fitted into the corresponding second slot.

6. The battery pack according to claim 5, characterized in that, A sealing layer (4) is provided between the first longitudinal beam mounting plate (111) and the groove wall of the corresponding second mounting slot, and a sealing layer (4) is provided between the second longitudinal beam mounting plate and the groove wall of the corresponding second mounting slot.

7. The battery pack according to claim 1, characterized in that, The crossbeam (13) includes a heat exchange crossbeam (132), the interior of which is provided with a heat exchange channel for the flow of heat exchange medium, and the heat exchange crossbeam (132) is located between adjacent battery cells (3).

8. The battery pack according to claim 7, characterized in that, The first longitudinal beam (11) has a flow-diverting channel for the flow of heat exchange medium inside, and the second longitudinal beam (12) has a flow-combining channel for the flow of heat exchange medium inside. The heat exchange channel of the heat exchange crossbeam (132) is connected between the flow-diverting channel and the flow-combining channel.

9. The battery pack according to claim 8, characterized in that, The frame assembly (1) further includes a connecting bolt (14), which has a connecting channel inside. The connecting bolt (14) includes a first connecting bolt and a second connecting bolt. The first connecting bolt connects the first longitudinal beam (11) and the heat exchange crossbeam (132), and the connecting channel of the first connecting bolt connects the diversion channel and the heat exchange channel. The second connecting bolt connects the second longitudinal beam (12) and the heat exchange crossbeam (132), and the connecting channel of the second connecting bolt connects the confluence channel and the heat exchange channel.

10. The battery pack according to claim 7, characterized in that, The crossbeam (13) includes a supporting crossbeam (133), there are at least two supporting crossbeams (133), and at least some of the adjacent supporting crossbeams (133) are provided with a plurality of heat exchange crossbeams (132) arranged at intervals, and the battery cell assembly (3) is provided between the supporting crossbeam (133) and the adjacent heat exchange crossbeam (132).

11. The battery pack according to claim 10, characterized in that, It also includes a top pressure assembly (5), which is connected to the top of the frame assembly (1) and abuts against the top of the cell assembly (3).

12. The battery pack according to claim 11, characterized in that, The top pressure assembly (5) includes a pressure strip (51) which is detachably connected to at least a portion of the support beam (133) and abuts against the top of the battery cell assembly (3).

13. The battery pack according to claim 12, characterized in that, The battery cell assembly (3) includes at least two battery cells (31) arranged at intervals. The top of the battery cell assembly (3) is provided with a plurality of pressure strips (51). The plurality of pressure strips (51) are arranged at intervals along the arrangement direction of the battery cells (31) of the battery cell assembly (3). The top of the pressure strip (51) is provided with a boss (511) extending along the arrangement direction of the pressure strips (51). Along the arrangement direction of the plurality of pressure strips (51), the bottom of the outermost pressure strip (51) is located outside the outermost battery cell (31), and the boss (511) of the outermost pressure strip (51) abuts against the top of the outermost battery cell (31). The bottoms of the remaining pressure strips (51) are inserted between adjacent battery cells (31), and the bosses (511) of the remaining pressure strips (51) abut against the top of adjacent battery cells (31).

14. The battery pack according to claim 11, characterized in that, The top pressure assembly (5) includes a cover plate (52) connected to the first longitudinal beam (11), the second longitudinal beam (12), and the outermost support beam (133) along the spaced arrangement direction of the plurality of beams (13).

15. The battery pack according to claim 12, characterized in that, It also includes at least one of the following: a foam layer (6), an insulating sheet (7), and a plastic sheet (8); The foam layer (6) is provided between the supporting beam (133) and the battery cell assembly (3), and / or between the heat exchange beam (132) and the battery cell assembly (3). The insulating sheet (7) is provided between the heat exchange beam (132) and the battery cell assembly (3), between the base plate (2) and the battery cell assembly (3), and between the pressure strip (51) and the battery cell assembly (3). The plastic plate (8) is provided between the supporting beam (133) and the battery cell assembly (3).

16. A battery pack assembly method as described in any one of claims 1-15, characterized in that, Also includes: S2. Connect the crossbeam (13) in the second assembly part (20) to the outermost bottom plate (2) in the first assembly part (10) along the arrangement direction, and / or, the crossbeam (13) in the second assembly part (20) and the outermost crossbeam (13) in the first assembly part (10) are arranged at intervals, connect the bottom plate (2) between the crossbeam (13) in the second assembly part (20) and the outermost crossbeam (13) in the first assembly part (10), and connect the crossbeam (13) in the first assembly part (10) between the first longitudinal beam (11) and the second longitudinal beam (12).

17. The battery pack assembly method according to claim 16, characterized in that, The crossbeam (13) includes a heat exchange crossbeam (132) and a support crossbeam (133), and the heat exchange crossbeam (132) has a heat exchange channel inside for the flow of heat exchange medium; In step S1, at least one of the support beams (133) is used as a reference, and the base plate (2) and the battery cell assembly (3) are alternately connected to the heat exchange beam (132) in sequence to form the first assembly part (10); at least one support beam (133) other than the support beam (133) of the first assembly part (10) is connected between the first longitudinal beam (11) and the second longitudinal beam (12) to form the second assembly part (20). In step S2, the first assembly part (10) is moved into the second assembly part (20), the support beam (133) in the second assembly part (20) is connected to the outermost bottom plate (2) in the first assembly part (10) along the arrangement direction, and / or, the support beam (133) in the second assembly part (20) is arranged at intervals with the outermost support beam (133) or heat exchange beam (132) in the first assembly part (10) along the arrangement direction, the bottom plate (2) is connected between the support beam (133) in the second assembly part (20) and the outermost support beam (133) or heat exchange beam (132) in the first assembly part (10), and the heat exchange beam (132) and the support beam (133) in the first assembly part (10) are both connected between the first longitudinal beam (11) and the second longitudinal beam (12).

18. The battery pack assembly method according to claim 17, characterized in that, In step S1, the crossbeam (13) serving as a reference is connected between the first positioning beam (30) and the second positioning beam (40), and then the base plate (2) and the battery cell assembly (3) are sequentially and alternately connected to the crossbeam (13), wherein each time a crossbeam (13) is sequentially connected, the crossbeam (13) is connected between the first positioning beam (30) and the second positioning beam (40) to define the position of each base plate (2), the battery cell assembly (3) and each sequentially connected crossbeam (13) relative to the crossbeam (13) serving as a reference; In step S2, the first assembly part (10) is clamped along the arrangement direction of the first assembly part (10) by the clamping member (50), then the first positioning beam (30) and the second positioning beam (40) are removed, the first assembly part (10) clamped by the clamping member (50) is moved into the second assembly part (20), and then the crossbeam (13) of the first assembly part (10) is connected between the first longitudinal beam (11) and the second longitudinal beam (12) before the clamping member (50) is removed.

19. The battery pack assembly method according to claim 16, characterized in that, In step S1, the first assembly part (10) is connected and formed above the second assembly part (20), and the crossbeam (13) serving as a reference is kept constant in the horizontal direction relative to the second assembly part (20); In step S2, the first assembly part (10) that has been connected and formed descends relative to the second assembly part (20) and falls into the second assembly part (20).

20. The battery pack assembly method according to claim 16, characterized in that, Also includes: S3. Set up a top pressure assembly (5), which is connected to the top of at least two of the crossbeams (13) and abuts against the top of the battery cell assembly (3).

21. The battery pack assembly method according to claim 20, characterized in that, The battery cell assembly (3) includes at least two battery cells (31) arranged at intervals, and the top pressure assembly (5) includes multiple pressure bars (51), with a boss (511) on the top of the pressure bar (51). In step S3, multiple pressure strips (51) are arranged at intervals along the arrangement direction of the battery cell (31), and the battery cell (31) abuts between the bottoms of two adjacent pressure strips (51), and the top of the battery cell (31) abuts against the boss (511). Then the pressure strips (51) are connected to the tops of at least two crossbeams (13).

22. The battery pack assembly method according to claim 21, characterized in that, In step S1, during the process of alternately connecting the base plate (2) and the cell assembly (3) to the crossbeam (13), a limiting member is provided between adjacent cells (31) of the cell assembly (3); In step S3, the limiting member is first removed, and then multiple pressure strips (51) are arranged at intervals along the arrangement direction of the battery cell (31).

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